WO2009084628A1 - Disposable diaper - Google Patents

Abstract

A disposable diaper which enables a wearer to perceive a temperature change without fail and enables a baby caretaker to perceive a temperature change from the outside easily when body liquids are excreted, in which a temperature change substance is inhibited from shifting or falling-off, and which exhibits a sufficient water absorption capacity and can attain both speedy temperature change and slow temperature change. A disposable diaper comprising a top sheet (11), a back sheet (12), an absorber (13) interposed therebetween, and a temperature change member (31) bearing a temperature change substance (30) which can cause a wearer-perceivable temperature change when comes into contact with body fluids, wherein at least part of the temperature change member (31) is arranged in such a state that the absorber (13) is absent between the top sheet (11) and the member (31) and between the back sheet (12) and the member (31). Further, the temperature change member (31) is formed by heat-melting partially the particles of the temperature change substance (30) to fix non-molten part of the substance (30) to the temperature change element (31).

Description

Disposable diapers

The present invention relates to disposable diapers such as disposable diapers, training pants for infants, or incontinence pads. More specifically, the present invention can detect the presence of excretion, particularly urine excretion, by a wearer or the like by temperature change. Related to disposable diapers.

The disposable diaper is usually composed of at least a liquid-permeable top sheet disposed on the front surface side, a liquid-impermeable back sheet disposed on the back surface side, and an absorbent body interposed between these two sheets. The article main body is configured, and excrement is absorbed and held by the absorbent body via the top sheet.

As such disposable diapers, conventionally, a training diaper that is configured to cause a temperature change at the time of excretion, and that allows the wearer to sense it, thereby promoting diaper separation is known. Such a temperature change is expressed by a temperature change substance that causes a temperature change that can be sensed by the wearer by contact with body fluid. For this reason, in the training diaper, it is important to keep a temperature change substance that causes a temperature change at the time of excretion at a predetermined location and to allow the wearer to sufficiently detect the temperature change.

For example, in Patent Document 1 below, an absorbent article that includes a moisture barrier and an absorbent assembly disposed on the moisture barrier, such that the wearer can sense when contacted with body drainage fluid. A liquid permeable temperature change member containing a temperature change substance that causes a temperature change of the above is disposed on the body side opposite to the moisture barrier with respect to the absorbent assembly. Moreover, in the following Patent Document 1, the temperature change member is configured by sandwiching a temperature change substance in the form of particles between a first containing layer such as a porous film and a second containing layer such as a liquid permeable film. Have been disclosed.

Moreover, in the following patent document 2, it is a disposable absorbent article which has an absorptive core and the temperature change element arrange | positioned on the said absorptive core, and is worn around the lower part of a wearer's trunk | body, Comprising: The said temperature The variable element includes a permeable layer, an impermeable layer disposed to face the permeable layer, and a temperature including a temperature change material sandwiched between the permeable layer and the impermeable layer. Urine deposited on the temperature change element can penetrate in the Z direction through the permeable layer to the impermeable layer, and the impermeable layer allows the urine to pass the temperature change element. Disposable absorbent articles are disclosed that prevent full passage in the Z direction and support the movement of urine in the XY plane to wet the temperature change material.
Japanese Patent No. 3922722 Japanese Patent No. 3830901

However, in the absorbent articles described in Patent Documents 1 and 2, even if there is a temperature change in the temperature change member due to excretion, the wearer is an infant, so it is not always possible to sense the temperature change and notify the child-care worker. First of all, it was necessary for childcare workers to confirm the degree of temperature change. When performing this confirmation, it was necessary to remove the disposable diaper each time, which was troublesome.

In addition, since the temperature change member is formed to be liquid permeable, the excreted body fluid comes into contact temporarily when passing through the temperature change substance, but quickly before the temperature change substance causes a sufficient temperature change. There is also a problem that even if there is excretion, the temperature change cannot be reliably detected even if it is absorbed and held by the absorbent assembly.

On the other hand, in the absorbent articles described in Patent Documents 1 and 2, although it has been disclosed that the temperature change substance is in the form of particles and is sandwiched between two layers of sheets, the temperature change substance is fixed between the layers. It is not disclosed whether it is fixed or not, and how it is fixed when it is fixed.

That is, in the temperature change member described in Patent Documents 1 and 2, when the temperature change substance is not fixed, before excretion of urine or the like, the temperature change substance sandwiched between the layers moves between the layers to a predetermined site. By not staying, problems such as inability for the wearer to reliably detect temperature changes may occur.

Also, even if the temperature change substance is fixed between the layers, the fixing method becomes a problem. In general, (1) bonding with an adhesive such as hot melt, and (2) pressure bonding by pressure can be considered as a method for fixing the temperature-change substance, but in the fixing method (1), the adhesive is used between the temperature-change substance and body fluid. This hinders contact and makes it difficult for temperature changes to occur (especially when the adhesive is hydrophobic or water-insoluble). The absorbent body itself at the portion to be disposed hardens into a plate shape and the wearing feeling deteriorates, or a problem such as insufficient fixing strength due to insufficient pressure may occur.

On the other hand, when a temperature change member is formed by sandwiching a particulate temperature change substance between two layers of sheets, at least the sheet on the use surface side is hydrophilic such as pulp (water absorption) to soften contact with the skin. Generally, fibers are mixed to form an airlaid nonwoven fabric or the like. However, when a particulate temperature change substance is arranged at a high density on a sheet having such a soft feeling, the particles cannot be fixed sufficiently and it is difficult to form a sheet. Further, even if the sheet can be formed, there are problems such that the temperature change substance escapes during the manufacturing process, and line conveyance becomes difficult due to insufficient strength of the sheet itself. In order to solve such a problem, it is conceivable to perform compression molding at a high pressure, but this is not a preferable method because flexibility is impaired.

In addition, when the temperature change substance is uniformly formed into particles, all the temperature change substance is uniformly dissolved in a short time due to the excretion of body fluid, and the temperature-changed urine diffuses throughout the absorber. The temperature change sometimes ended before the wearer sensed it enough.

By the way, the temperature change element described in Patent Document 2 increases the chance of contact between the temperature change substance and the body fluid by retaining the body fluid on the upper surface of the liquid-impervious layer, thereby enabling the temperature change to be expressed with certainty. However, on the other hand, there arises a problem that the absorption of the body fluid into the absorbent core is inhibited.

Accordingly, a first problem of the present invention is to provide a disposable diaper that allows a wearer to reliably detect a temperature change during body fluid excretion, and that a childcare person can easily detect the temperature change from the outside. It is to provide.

The second problem is that the temperature change substance is fixed in a predetermined place so that the wearer can surely sense the temperature change, and the temperature change substance is prevented from moving or dropping, and has sufficient water absorption. And providing a disposable diaper having both rapid and slow effects of temperature change action.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the wearer is brought into contact with the body fluid. A disposable diaper provided with a temperature change member comprising either a granular material of a temperature change substance that generates a temperature change of a perceptible degree, or a molded body thereof or a sheet-like material carrying the temperature change substance. ,
At least a part of the temperature change member is disposed such that the absorber is not interposed between the top sheet and the absorber, and the absorber is not interposed between the back sheet and the back sheet. A disposable diaper is provided.

In the first aspect of the present invention, at least a part of the temperature changing member is disposed so that no absorber is interposed between the top sheet and the absorber, and no absorber is interposed between the back sheet and the back sheet. That is, on both the front side and the back side of the temperature change member, portions that can come into contact with the skin (other diaper constituent members may be interposed) are formed without using an absorber serving as a heat blocking layer. As a result, the wearer can not only detect temperature changes reliably, but it is also easy for the childcare or caregiver to remove the diaper by touching it from the outside without removing the diaper. I can know.

As a second aspect of the present invention, the absorbent body is formed with a defect portion where no absorber is interposed between the top sheet and the back sheet, and the temperature change member is at least the defect portion in a plan view. The disposable diaper according to claim 1, wherein the disposable diaper is disposed so as to overlap a part thereof.

As a second aspect of the present invention, the absorbent body is formed with a defect portion where no absorber is interposed between the top sheet and the back sheet, and the temperature change member is at least the defect portion in a plan view. It is arrange | positioned so that it may overlap with a part, and the total basis weight of the structural member arrange | positioned between the said temperature change member and the outer surface of the said disposable diaper in the said defect | deletion part is the surface side and back surface of the said temperature change member The disposable diaper according to claim 1, which is 100 g / m ² or less on both sides of the side.

The invention according to claim 2 prescribes the total basis weight of the diaper constituent members other than the absorbent body, which can be a heat shielding layer between the temperature changing member and the temperature changing member and the diaper outer surface. It is a thing. Specifically, a defect portion where no absorber is interposed between the top sheet and the back sheet is formed in the absorber, and the temperature change member is arranged so as to overlap at least a part of the defect portion in plan view. In addition, the total basis weight of the other diaper constituent members in this part is 100 g / m ² or less for each of the front surface and the back surface. As a result, at least part of the temperature change member can be configured such that no absorber is interposed between the top sheet and the absorber, and no absorber is interposed between the back sheet and Temperature changes are easily transmitted to the outer surface of the diaper.

As the present invention according to claim 3, there is provided the disposable diaper according to claim 2, wherein the defect portion is formed at least in an intermediate portion in a longitudinal direction and a width direction of the absorber.

The invention described in claim 3 prescribes a preferable formation mode of the defect portion. Specifically, the absorbent body has an open defect portion in which the absorbent body is not interposed between the top sheet and the back sheet in the middle part in the longitudinal direction and the width direction, and the temperature change member is in plan view. It arrange | positions so that it may overlap with at least one part of the said defect | deletion part. As a result, more contact between the temperature change member and the body fluid is made during excretion, temperature change due to the temperature change substance is effectively performed, and the wearer's perception is most uncomfortable due to temperature change. Since it is performed in a local area that is easy to detect, the wearer can detect a temperature change, and a childcare person or the like can detect the temperature change.

As the present invention according to claim 4, the temperature change member is fixed to the temperature change member by heating and melting a part of the particulate matter of the temperature change material. A disposable diaper according to claim 1 is provided.

In the invention described in claim 4 above, by heating and melting a part of the particulate matter of the temperature change substance, the granular temperature change substance that is not heated and melted is fixed to the temperature change member. Here, as a result of the inventor's various experiments regarding the fixing method of the temperature change substance, the inventors have come to know that the temperature change substance has a property of having an adhesive function with other members by heating and melting. It was. Therefore, in the present invention, a temperature change substance melt is formed by heating and melting a part of the temperature change substance particulate matter, and the melt adheres to the surrounding temperature change member and the temperature change is not heated and melted. By adhering or fusing the particulate matter of the substance, and then solidifying the melt, the heated and melted temperature change substance and the temperature change substance not heated and melted are fixed to the temperature change member. Thereby, the temperature change substance can be fixed at a predetermined place of the temperature change member, and the wearer can be surely sensed by the temperature change. In addition, since a part of the particulate matter of the temperature change substance is heated and melted and fixed to the temperature change member, the movement and dropout of the temperature change substance can be prevented.

On the other hand, in the present invention, as in the prior art, even if a liquid-impermeable layer is not provided in the lower layer of the temperature change member, a part of the temperature change substance is heated and melted to form a sheet-like melt-solidified layer. Therefore, the penetration of the body fluid from the upper layer to the lower layer of the absorber becomes gentle, and the time for the body fluid to stay around the temperature change member becomes longer, so that the contact between the temperature change member and the body fluid is sufficiently performed. Become. For this reason, the problem that a bodily fluid absorption is inhibited with the liquid-impermeable layer unlike the conventional diaper does not arise, and it can be set as the disposable diaper provided with sufficient water absorption.

Furthermore, in the present invention, the temperature-change material that has been heated and melted is integrated as a melt-solidified material after solidification, while the temperature-change material that is not heat-melted is maintained in a granular form. The temperature change effect due to contact with body fluids occurs quickly, and the temperature change substance that has been heated and melted into a melted solid body is delayed in the temperature change effect due to contact with body fluids. And it becomes possible to make a disposable diaper that combines slow-acting properties.

The present invention according to claim 5 provides the disposable diaper according to claim 4, wherein the particulate matter of the temperature change substance has a bulk density of 50% or less of the true density and an average particle diameter of 200 to 600 μm. Is done.

The invention according to claim 5 is a case where a granular material (or an irregular shape having a large surface area or a shape having fine pores) having many voids in the particle structure is used as the temperature change substance particulate material. In addition, the apparent bulk density is 50% or less of the true density of the temperature change substance itself, and the average particle size is 200 to 600 μm. Thereby, the dissolution rate of the granular temperature change substance is improved, and the temperature change becomes rapid. On the other hand, the temperature change substance that has been melted by heating and becomes a solidified body has a bulk density close to the true density and the voids are reduced, so that the dissolution rate becomes slow and the temperature change becomes gentle. The average particle diameter is a median diameter defined in JIS K 1474-2007.

As the present invention according to claim 6, there is provided the disposable diaper according to claim 4, wherein the temperature-changing substance to be heated and melted has a viscosity of 5 to 80 P (poise) in a temperature range of 70 to 130 ° C.

In the invention described in claim 6 above, in consideration of the fluidity at the time of melting of the temperature change substance, at least the temperature change substance to be heated and melted is in the range of 70 to 130 ° C. which is a temperature suitable for processing. Those having a viscosity of ˜80 P (poise) are used.

In the present invention according to claim 7, the temperature change member includes two or more kinds of particulate matter of the temperature change substance having different particle diameters, and heat-melts the temperature change substance having a relatively small particle diameter. The disposable diaper according to claim 4, wherein the temperature change material that is not heated and melted is fixed to the temperature change member.

In the invention described in claim 7 above, even with the same temperature-changing substance, a small-diameter granule is mainly heated and melted by utilizing the fact that a material with a small particle size is easier to melt than a material with a large particle size. Then, the melt-solidified body is formed, and the temperature change substance particles that are not heated and melted are fixed to the temperature change member.

As the present invention according to claim 8, a part of the temperature change substance is heated from the back side of the temperature change member or simultaneously with cooling from the front side of the temperature change member from the back side of the temperature change member. The disposable diaper according to claim 4, wherein the temperature change material that is not heated and melted and located near the surface of the temperature change member is fixed to the temperature change member by heating and melting.

In the invention according to claim 8, the temperature change member is brought closer to the back side of the temperature change member by heating from the back side of the temperature change member or by cooling from the back side of the temperature change member simultaneously with cooling from the front side of the temperature change member. A part of the temperature change substance located is heated and melted to form the melt-solidified body, and the temperature change substance not heated and melted is fixed to the temperature change member.

As the present invention according to claim 9, the temperature change member includes particulates of two or more kinds of the temperature change substances having different melting points, and by heating and melting the temperature change substance having a relatively low melting point, The disposable diaper according to claim 4, wherein the temperature change material that is not heated and melted is fixed to the temperature change member.

In the invention described in claim 9, the temperature change substance having a relatively low melting point is heated and melted to form the melt-solidified body, and the temperature change substance that is not heated and melted is fixed to the temperature change member.

In the present invention according to claim 10, the temperature change member is coated with the temperature change material that has been heated and melted in advance, and then the temperature change material is dispersed on the upper layer thereof, thereby the temperature change member. The disposable diaper according to claim 4, wherein a substance is fixed to the temperature changing member.

In the invention according to claim 10, after the temperature-change substance that has been heated and melted in advance is applied, the granular temperature-change substance is spread on the upper layer thereof, whereby the dispersed temperature-change substance is removed from the temperature change member. It is intended to be fixed to.

As the present invention according to claim 11, there is provided the disposable diaper according to claim 2, wherein the defect portion is formed at both side ends of the crotch portion of the absorbent body.

The invention described in claim 11 prescribes a preferable formation mode of the defect portion. Specifically, the absorbent body is formed with a constricted defect portion in which the absorbent body is not interposed between the top sheet and the back sheet at both side ends corresponding to the crotch portion of the wearer. The changing member is arranged so as to overlap with at least a part of the defective portion. Since both end portions of the crotch portion of the absorbent body are sandwiched between the thighs of the wearer, it is easy to be in close contact with the wearer in any posture, so the excreted body fluid is on the surface side of the temperature change member The placement portion and the side portion placement portion allow the wearer to sense a temperature change in any posture, and the rear face side placement portion can sense a temperature change to the childcare person or the like.

As the present invention according to claim 12, there is provided the disposable diaper according to claim 2, wherein the defect portion is formed at both ends or one end in the longitudinal direction of the absorber.

The invention described in claim 12 prescribes a preferable form of formation of the defect portion. Specifically, the absorbent body is formed with a defect portion where no absorber is interposed between the top sheet and the back sheet at the end in the longitudinal direction, and the temperature change member is at least one of the defect portions in plan view. It arrange | positions so that it may overlap with a part. If comprised in this way, at the time of excretion in the state of lying down, it will become possible to make a wearer, a childcare person, etc. sense a temperature change effectively.

According to a thirteenth aspect of the present invention, the side portion of the temperature change member disposed on the lower surface or the upper surface of the absorber is disposed so that the side portion of the absorber is wound around the forehead or the absorber is encapsulated. A disposable diaper according to claim 1 is provided.

In the invention described in claim 13, the temperature change member disposed on the lower surface or the upper surface of the absorber is disposed so that the side portion of the absorber is wrapped around the frame or encased. At least a part of the change member may be configured such that no absorber is interposed between the top sheet and the absorber, and no absorber is interposed between the back sheet and the back sheet. As a result, the body fluid excreted from the front side can cause the wearer to sense the temperature change by the surface side arrangement portion of the temperature change member, and the childcare person or the like can sense the temperature change by the back side arrangement portion. become.

As the present invention according to claim 14, there is provided a disposable diaper according to any one of claims 1 to 13, wherein the temperature change member contains a superabsorbent polymer.

In the invention described in claim 14, since the temperature change member swells when the body fluid is absorbed by mixing the superabsorbent polymer into the temperature change member, the temperature change member can easily come into contact with the wearer's body. Thus, it becomes possible to reliably detect temperature changes. In addition, the body fluid whose temperature has been changed by the action of the temperature changing member is held in the superabsorbent polymer before diffusing into the absorbent body, and the temperature change continues, so that the wearer can reliably detect the temperature change, In addition, childcare workers can reliably detect temperature changes.

As described above in detail, according to the present invention, the temperature change can be surely detected by the wearer during body fluid excretion, and the childcare person can easily detect the temperature change from the outside.

In addition, by fixing the temperature-changing substance at a predetermined place, the wearer can be surely sensed the temperature change, and the temperature-changing substance can be prevented from moving or dropping, and has sufficient water absorption and temperature. It is possible to have both rapid action and slow action of the changing action.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a product state external view of the disposable paper diaper 1 according to the present invention, and FIG. 2 is a development view thereof.

As shown in FIGS. 1 and 2, a disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is a cotton-like material between a liquid-permeable top sheet 11 made of a nonwoven fabric and a back sheet 12 made of polyethylene or the like. Absorbent body 10 including an absorbent main body 10 having an absorbent body 13 such as pulp interposed therein and an encapsulating sheet 14 surrounding the absorbent body 13 and having three-dimensional gathers BS and BS formed on both sides of the surface wrinkle. And an exterior sheet 20 integrally provided on the outer surface side of the back sheet 12, and the waist opening is obtained by joining the front body F and the back body B of the exterior sheet 20 on both sides in the product state. And a pair of left and right leg openings are pants-type disposable diapers.

In particular, in the disposable diaper 1 according to the present invention, a granular material of the temperature change material 30 that causes a temperature change that can be sensed by the wearer by contact with a body fluid, or a molded body thereof or a sheet shape carrying the temperature change material. A temperature change member 31 comprising any one of the objects is provided, and at least a part of the temperature change member 31 is disposed so that the absorber 13 is not interposed between the top sheet 11 and the temperature change member 31; The absorber 13 is also arranged so as not to be interposed between the back sheet 12 and the back sheet 12. In the illustrated example, the absorbent body 13 is formed with an open defect 32 where the absorbent body 13 is not interposed between the top sheet 11 and the back sheet 12 at the center position in the width direction of the intermediate portion in the longitudinal direction. It is disposed inside the defect portion 32.

Further, as a preferred configuration of the temperature change member 31, a aggregate of the particulate matter of the temperature change substance 30 is a main constituent, and a part of the particulate matter of the temperature change substance 30 is heated and melted. Thus, the temperature change substance 30 that is not heated and melted can be fixed to the temperature change member 31.

(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail with reference to FIGS.
As described above, the absorbent main body 10 includes a fiber aggregate such as cotton-like pulp and a superabsorbent polymer between the liquid-permeable top sheet 11 made of nonwoven fabric and the like and the back sheet 12 made of polyethylene or the like. It has a structure in which an absorbent body 13 made of a highly absorbent material is interposed, and absorbs and holds bodily fluids.

The absorbent body 13 is preferably about 50 ~ 600g / ^{m 2} basis weight, more preferably about 200 ~ 400g / ^{m 2.} Examples of the superabsorbent polymer include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process, the superabsorbent polymer having the water absorption capability can adjust the water absorption (absorption capacity) and the water absorption speed by adjusting the crosslink density and the crosslink density gradient. The content of the superabsorbent polymer in the absorber 13 is suitably about 30 to 70%, but is not limited to this. Also, in the illustrated example, a shape formed with a substantially square shape in plan view is used, and the width dimension is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion.

The absorber 13 is surrounded by the encapsulating sheet 14. As the encapsulating sheet 14, a paper material such as tissue or a liquid-permeable sheet such as a nonwoven fabric can be used. However, the fiber aggregate, the superabsorbent, or the temperature change member 31 contained in the absorber 13 does not come out. What has a fiber density of a grade can be used. Further, when the temperature changing member 31 is surrounded by the encapsulating sheet 14, a thin and low basis weight material is appropriate in order to easily detect a temperature change from the surface side. The thickness is preferably about 0.05 to 0.5 mm, more preferably about 0.05 to 0.2 mm. The basis weight is preferably about 5 ~ 25g / ^{m 2,} more preferably about 5 ~ 15g / ^{m 2.} When using a non-woven fabric, a non-woven fabric processed by a spunbond method or an SMS method, particularly a non-woven fabric processed by an SMS method, is preferred because of its excellent balance between thinness and strength. In addition, as long as the surface of the absorber 13 at least the surface side (skin contact surface side) of the encapsulating sheet 14 is not water-repellent, the hydrophilicity of the sheet is not particularly limited. Moreover, if it is comprised so that the said fiber assembly contained in the absorber 13, the high absorbent material, or the temperature change member 31 may not come out, the front side surface or back side surface or both of the encapsulating sheet 14 may be omitted. Is also possible. In particular, since the leak-proof sheet 12 is usually disposed on the back side of the absorber 13, the back side surface of the encapsulating sheet 14 may be omitted if there is no problem in the manufacturing process.

It is preferable that the absorbent body 13 is formed with a defect 32 where the absorbent body 13 is not interposed between the top sheet 11 and the back sheet 12. In the illustrated example, the missing portion 32 is formed in an intermediate portion in the longitudinal direction and the width direction of the absorber 13. In particular, the position in the width direction of the defect portion 32 is preferably the center position in the width direction. In the case of boys, it is preferable that the defect portion 32 is located on the front side in the longitudinal direction, and in particular, disposed so as to include a portion where the absorbent body 13 intersects the line connecting the lower end portions of the joint portions on the left and right sides of the exterior sheet 20. If it is done, it is close to the urination port and the defect 32 is always pressed against the body by the action of the elastic elastic member, so that the wearer can sense the temperature change in any posture. ,preferable. Further, in the case of a girl, it is preferable that the defect portion 32 is disposed so as to include the central portion in the longitudinal direction because it is close to the urination port. Therefore, in the case of unisex, if the line connecting the lower ends of the joints on both sides of the exterior sheet 20 and the absorbent body 13 are arranged so as to include a crossing portion and a longitudinal central portion, the temperature changing member during excretion More contact with bodily fluids, temperature changes due to temperature-changing substances will be more effective, and wearer's perception will be done in a local area where it is most likely to sense discomfort due to temperature changes Therefore, it is preferable because the wearer can sense the temperature change and the childcare person can sense the temperature change. Further, as will be described in detail in a later embodiment, the absorber 13 may be formed in a slit shape along the longitudinal direction at the center position in the width direction, or formed in a constricted shape on both sides of the crotch region of the absorber 13. Alternatively, it may be formed in a constricted shape at the front end portion and / or the rear end portion of the absorber 13. The temperature changing member 31 is disposed in the defect portion 32 in the illustrated example. The temperature changing member 31 is preferably disposed so as to include the entire defect portion 32 or to substantially overlap with each other in plan view, but is arranged so as to overlap at least a part of the defect portion 32. It only has to be installed.

As the liquid-permeable top sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, an SMS method, a thermal bond method, an air through method, a point bond method, a melt blown method, or a needle punch method can be used. In particular, non-woven fabrics processed by the spunbond method or SMS method are suitable in terms of excellent balance between thinness and strength in order to easily detect temperature changes from the surface side, and non-woven fabrics processed by the air-through method are low. Even the basis weight is suitable because of quick absorption and excellent dry touch properties. These may be a sheet made of two or more layers in a sheet composed of a single layer (the same type or plural types) but, as the basis weight of the total, preferably 10 ~ 40 g / ^{m 2,} more preferably 10 ~ 22 g / ^{m 2} 10 to 15 g / m ² is particularly preferable. The thickness is preferably 1 mm or less, more preferably 0.5 mm or less, and particularly preferably 0.3 mm or less. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back surface side of the absorbent body 13 around the side edge of the absorbent body 13.

As the back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of preventing stuffiness. Are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility. Specifically, the moisture permeability measured according to JIS Z0208 is 3000 to 12000 g / m ² · 24 hr, preferably 6000 to 12000 g / m ² · 24 hr, more preferably 8000 to 12000 g / m ² · 24 hr. It is desirable to use a liquid sheet.

On the other hand, the gathered nonwoven fabric 16 forming the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edge of the absorbent body 13 that is wound by the liquid-permeable top sheet 11 is further wound from above. The absorber 13 extends to the back side and is bonded. More specifically, the gathered nonwoven fabric 16 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range extending from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

In the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 17, 17... The thread-like elastic elastic members 17, 17... Are for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic elastic force in a product state.

As the thread-like elastic expansion and contraction member 17, a material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that is usually used can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness is 940 dtex or less and the tension (extension rate) is 150 to 350%. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

In the same manner as the liquid-permeable top sheet 11, the material fiber constituting the gathered nonwoven fabric 16 is not limited to synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, but also regenerated fibers such as rayon and cupra, A natural fiber such as cotton can be used, and a nonwoven fabric obtained by an appropriate processing method such as a spunbond method, an SMS method, a thermal bond method, an air-through method, a point bond method, a melt blown method, or a needle punch method can be used. In particular, when the temperature change member 31 is arranged on the side, in order to make it easy to detect temperature change from the side, and to prevent stuffiness, the nonwoven fabric has excellent air permeability by suppressing basis weight. Should be used. Specifically, the nonwoven fabric processing method by the spunbond method or the SMS method is suitable in terms of excellent balance between thinness and strength, and the basis weight is preferably 8 to 30 g / m ² and 10 to 22 g. / M ² is more preferable, and 10 to 15 g / m ² is particularly preferable. The thickness is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less. Furthermore, with respect to the gathered nonwoven fabric 16, in order to prevent permeation of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent You may use the water-repellent treatment nonwoven fabric which coated etc. .

Moreover, although not shown in figure, the waterproof property may be improved by sandwiching a liquid-impermeable sheet similar to the back sheet 12 inside the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric.
As shown in FIGS. 3 and 4, the absorbent main body 10 and the exterior sheet 20 are integrally bonded to the upper surface side of the exterior sheet 20 with an adhesive such as hot melt. Then, the absorbent main body 10 and the exterior sheet 20 are folded in the front-rear direction, and both side portions thereof are joined to each other by a welding means such as a heat seal or an ultrasonic seal or an adhesive means such as a hot melt adhesive. The pants-type paper diaper 1 shown in FIG. 1 is assembled.

(Structure of exterior sheet 20)
Next, the structure of the exterior sheet 20 will be described in detail based on FIG. 4 and FIG. The exterior sheet 20 is a two-layer nonwoven fabric sheet in which the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are bonded with a hot melt adhesive or the like, and various elastic elastic members are hot between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. It is fixed under stretch by a melt adhesive or the like, and is given elasticity. The planar shape forms a pseudo hourglass shape as a whole by the concave leg circumference cut lines 29 for forming leg openings on both sides of the middle.

The material fibers constituting the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B are not only the permeable topsheet 11 and the gathered nonwoven fabric 16, but also synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, and rayon. Natural fibers such as spunbond, SMS, meltblown, thermal bond, air through, point bond, needle punch, etc. However, in order to make it easier to detect temperature changes from the back side, and to prevent stuffiness, it is better to use a nonwoven fabric with excellent air permeability by suppressing basis weight. . Specifically, the nonwoven fabric processing method by the spunbond method or the SMS method is suitable in terms of excellent balance between thinness and strength, and the basis weight is preferably 8 to 30 g / m ² and 10 to 22 g. / M ² is more preferable, and 10 to 15 g / m ² is particularly preferable. The thickness is preferably 0.5 mm or less, more preferably 0.3 mm or less, and particularly preferably 0.2 mm or less. Furthermore, it is preferable to use a nonwoven fabric that has been subjected to the same water repellent treatment as the gathered nonwoven fabric 16.

In the exterior sheet 20 according to the present invention, as the elastic elastic member, as shown in the developed shape of FIG. 5, waist elastic elastic members 24, 24... Disposed around the waist opening 23, and the front body F Further, the back body B includes a plurality of waist elastic elastic members 25, 25,... Which are arranged along the horizontal direction at intervals in the vertical direction and for forming shearing around the waist.

The waist elastic elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edge 21 where the front body F and the back body B are joined, with an interval in the vertical direction. A plurality of elastic rubber elastic elastic members for attaching a disposable diaper to the body by applying an elastic force to tighten around the waist of the body. As the waist elastic elastic member 24, thread rubber is used in the illustrated example. However, for example, a tape-like elastic member may be used.

The waist elastic elastic members 25, 25... Extend from the upper position to the lower position excluding the waist opening edge 23 of the side joint edge 21, or from the side joint edge 21 to the crotch side as shown in the figure. It is a rubber elastic elastic member that is arranged along the horizontal direction at intervals in the vertical direction over the range, and applies a horizontal elastic force to the waist part of the front body F and the back body B, respectively. This is for forming the waistline shearing zones K1, K2. It should be noted that the boundary between the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. For example, even if the number of elastic elastic members arranged in the horizontal direction with an interval in the vertical direction between the front body F and the back body B cannot be specified, some of the upper elastic members 24 on the upper side are provided. As long as the remaining elastic elastic member functions as the waist elastic elastic member 25. In order to prevent the absorbent body 13 from contracting, the waist elastic members 25 are not continuous near the center where the absorbent main body is joined, and the elastic elastic members 25 crossing the absorbent main body 10 are cut. Further, the structure may be discontinuous and may not have elasticity provided by the waist elastic members 25.

In addition, in the exterior sheet 20, the longitudinal direction (front-rear direction) intermediate portion of the crotch portion where the elastic elastic member is not disposed is not a two-layer structure as described above, but a one-layer structure that does not include the upper layer nonwoven fabric 20A or the lower layer nonwoven fabric 20B. Alternatively, it is preferable that the intermediate sheet in the longitudinal direction of the crotch does not have the exterior sheet 20 and the exterior sheet 20 is separated into a front body exterior sheet and a back body exterior sheet. As described above, it is preferable that the crotch part does not have an exterior sheet or has an area where the number of exterior sheets overlap is small, because in this area, it is easy to detect a temperature change from the back side. In addition, when it does not have the exterior sheet 20 in the longitudinal direction intermediate part of a crotch part, you may arrange | position the crotch exterior sheet | seat which consists of a nonwoven fabric etc. in the back surface side of an absorptive main body. For the crotch lower exterior sheet, a nonwoven fabric similar to the upper layer nonwoven fabric 20A or the lower layer nonwoven fabric 20B may be used, but it is appropriate to use a single sheet (one layer) of nonwoven fabric.

[Configuration of Temperature Changing Member 31]
<Basic Configuration of Temperature Change Member 31>
Next, the structure of the temperature change member 31 will be described in detail.
The temperature change member 31 is a granular material of the temperature change material 30 that causes a temperature change that can be sensed by the wearer by contact with body fluid, or a molded body thereof or a sheet-like material carrying the temperature change material. It is composed of either of them, and the temperature change of the temperature change substance 30 allows the wearer to sense the temperature change, and the childcare person or the like can sense the temperature change from the outside.

Generally, such a temperature change can be easily obtained by utilizing the heat of dissolution of a substance. There are two types of temperature change substances: one that absorbs heat and one that dissipates heat upon contact with an aqueous body fluid solution such as urine. The temperature change substance that absorbs heat gives the wearer a cool sensation. Gives a warm feeling. Among such temperature change materials 30, in the present invention, it is preferable to use a temperature change material exhibiting an endothermic effect that gives a cool feeling to the wearer. This is because the body fluid such as urine drops in temperature from the high temperature state after excretion, and by promoting this temperature drop, it exerts a cooling action and makes the wearer feel more uncomfortable. It is based on the idea that it can be caused automatically.

Since a temperature change substance cannot exhibit a sufficient temperature change unless it is easily dissolved in a body fluid, it is preferable that the solubility in 100 ml of water at a temperature of 20 ° C. is 30 g or more, particularly 50 g or more. The temperature-changing substance is preferably one that causes an energy change of 20 cal / g or more, particularly 35 cal / g or more.

Specifically, as an example of a temperature change substance that exhibits an endothermic effect upon contact with a body fluid, the salt oxide is sodium acetate, sodium carbonate, sodium sulfate, sodium thiosulfate, sodium phosphate, the anhydrous salt is ammonium nitrate, Examples of potassium nitrate, ammonium chloride, potassium chloride, sodium nitrate, and organic compounds include sugar alcohols such as sorbitol and xylitol, urea, and the like. On the other hand, examples of the temperature-changing substance that exhibits a heat dissipation action upon contact with a body fluid include aluminum chloride, aluminum sulfate, and aluminum potassium sulfate.

In the present invention, among these, it is preferable to use sugar alcohols such as sorbitol and xylitol that exhibit endothermic action, or organic compounds such as urea. In particular, sorbitol and xylitol can be suitably used because they are extremely excellent in solubility, have good chemical stability, and do not adversely affect the human body. Since disposable diapers usually contain a thermoplastic resin such as polyethylene or polypropylene, it is desirable that the temperature changing material has a melting point equal to or lower than those resins. Among general thermoplastic resins, polyethylene having a particularly low melting point usually has a melting point of about 100 to 130 ° C. Therefore, the melting point of the temperature changing substance is preferably 130 ° C. or less, and preferably 100 ° C. or less. More preferred. Moreover, it is preferable to have a melting point of 70 ° C. or higher so as not to melt during storage. The sorbitol and xylitol are also suitable for the present invention in that the melting point is usually about 95 to 110 ° C. (which varies slightly depending on the purity).

The temperature changing member 31 is arranged on the paper diaper 1 as a powdery body of the temperature changing substance 30, or as a molded article or a sheet-like material carrying the temperature changing substance 30. That is, the temperature-change substance 30 in powder form is sprayed as it is, or the temperature-change substance 30 is dissolved to form a flexible sheet, or the temperature-change substance 30 is supported on a sheet such as a nonwoven fabric or paper. Can be used. In particular, the latter sheet-like product is obtained by fixing a powdery temperature change substance 30 on a substrate made of a sheet material such as nonwoven fabric or paper, or impregnating or applying an aqueous solution of the temperature change substance 30. The temperature change substance 30 is supported by drying or applying a melted temperature change substance 30.

The temperature change member 31 may be formed by encapsulating a molded body of the temperature change material 30 with the base material, or overlapping the molded body between the base materials. The basis weight of the temperature change substance 30 may be 50 to 1000 g / m ² , preferably 300 to 700 g / m ² . If the basis weight of the temperature change substance 30 is less than 50 g / m ² , the change in temperature is not appreciably apparent, and if it exceeds 1000 g / m ² , the effect is not only saturated but also the cost increases.

Further, it is preferable that the temperature change member 31 contains a superabsorbent polymer. Thereby, since the temperature change member 31 expand | swells at the time of bodily fluid absorption, the temperature change member 31 becomes easy to contact a wearer's body, and a temperature change can be reliably detected now. Further, the body fluid whose temperature has been changed by the action of the temperature changing member is held by the superabsorbent polymer before diffusing into the absorbent body, so that the temperature change continues.

The superabsorbent polymer is, for example, granular powder and is mixed in the granular material of the temperature change material 30 or mixed in the base material constituting the temperature change member 31. As the superabsorbent polymer, the same polymer as that contained in the absorber 13 may be used. If a polymer having an absorption rate of 50 seconds or less, particularly 40 seconds or less is used, Since many body fluids that have undergone temperature changes can be absorbed and retained, an excellent temperature change sustaining effect can be expected. The absorption rate is the time required for a 2 g sample to absorb 50 g of physiological saline, and is measured based on JIS K 7224-1996. The basis weight of the superabsorbent polymer can be 20 to 200 g / m ² , preferably 50 to 100 g / m ² . If the amount of polymer is less than 20 g / m ^2, it is difficult to ensure the amount of swelling of the temperature change member 31 due to absorption of body fluid. If it exceeds 200 g / m ² , not only will the effect be saturated, but it will give a sense of incongruity due to the excess of the superabsorbent polymer.

The temperature changing member 31 may be mixed with cellulosic fibers or synthetic fibers. Further, the temperature changing member 31 may be laminated between the same encapsulating sheet material as the encapsulating sheet 14 such as tissue or non-woven fabric, or may be wound or encapsulated with this encapsulating sheet material. The total basis weight of the paper diaper 1 formed as described above is about 100 to 1500 g / m ² , preferably about 400 to 800 g / m ² . Moreover, since not only the absorber 13 but another diaper constituent member can also serve as a heat blocking layer, at least a portion overlapping with the deficient portion 32 is another portion disposed between the temperature change member 31 and the outer surface of the disposable diaper. The total basis weight of the diaper constituent members (top sheet 11, back sheet 12, encapsulating sheet 14, adhesive, etc.) may be 100 g / m ² or less on both the front side and the back side of the temperature change member 31. Preferably, it is more preferably 60 g / m ² or less, and particularly preferably 40 g / m ² or less. Similarly, the part which overlaps the said defect | deletion part 32 has the total thickness of the other diaper structure member arrange | positioned between the temperature change member 31 and the outer surface of a disposable diaper, both sides of the surface side of the temperature change member 31, and a back surface side. In each case, the thickness is preferably 1.0 mm or less, and more preferably 0.6 mm or less. Therefore, for example, with respect to the exterior sheet, by adopting the above-mentioned crotch exterior sheet, it is only one sheet, the gathered nonwoven fabric 16 is not a double sheet but a single sheet or the internal liquid-impervious sheet is omitted, By omitting the front side surface and / or the back side surface of the encapsulating sheet 14, it is possible to reduce the number of overlapping sheets, which is preferable because it leads to a reduction in the amount of adhesive used. The overlapping portion of the defect portion 32 is such that the number of overlapping diaper constituent members arranged between the temperature change member 31 and the outer surface of the disposable diaper is 3 on both the front side and the back side of the temperature change member 31. The number is preferably no more than 2, and more preferably no more than 2.

<Preferable structure of temperature change member 31>
As a preferred configuration of the temperature change member 31, the temperature change substance 30 is fixed to the temperature change member 31 by forming the temperature change substance 30 in a particulate form and heating and melting a part thereof. Like that.

As one mode for forming the temperature change member 31, a sheet (laminate) including the temperature change substance 30 can be formed, and the sheet can be cut into an appropriate length and disposed on the absorber 13. In this case, the temperature change member 31 may be disposed on the absorber 13 and then surrounded by the encapsulating sheet 14, or may be disposed on the absorber 13 surrounded by the encapsulating sheet 14. . As such a temperature change member 31, the particulate matter (and superabsorbent polymer) of the temperature change substance 30 is laminated in the whole (or a part thereof) between the fiber aggregate layers 31 ′ made of pulp fibers or the like. It is obtained by sandwiching in a mixed state and heating to integrate. At this time, a part of the temperature change substance 30 maintains the state of particles, and the remaining part is solidified after melting, and the particulate matter, fiber, superabsorbent polymer, etc. of the temperature change substance 30 are fixed and integrated. ing. The laminated body (temperature changing member 31) including the temperature changing substance 30 may be further laminated with a liquid-permeable sheet similar to the encapsulating sheet 14 on the upper surface and / or the lower surface. An air-laid nonwoven fabric manufacturing process may be applied to the formation of such a temperature change member 31.

The temperature change member 31 thus configured is integrated as a melt-solidified material after the heat-melted temperature-change material 30 is solidified, while the temperature-change material 30 that is not heat-melted maintains the original granular shape. Therefore, the temperature change substance 30 that is not heated and melted quickly generates a temperature change action due to contact with the body fluid, and the temperature change substance 30 that is heated and melted into a molten solid body is delayed in the temperature change action caused by the contact with the body fluid. As a result, the temperature change member 31 having both rapid and slow effect of the temperature change action can be obtained.

Here, if the water-soluble substance has the same level of solubility, the rate of dissolution is proportional to the surface area. Therefore, the dissolution rate of the particulate substance is higher than that of the massive substance. Of the (fine) particles, those having a granular structure with many voids in the particle structure (or those having an indefinite shape having a large surface area or a shape having fine pores) have a higher dissolution rate. In this configuration, the fact that the dissolution rate of the temperature change substance 30 is fast means that the temperature change is rapid. Therefore, it is preferable that the temperature change substance 30 used for this structure is a (fine) particulate form, especially a granular form. Specifically, the bulk density is preferably 50% or less of the true density. This means that the temperature change substance has a void (space) of 50% or more with respect to the apparent volume. Therefore, dissolution becomes rapid. For sorbitol, true density Since 1.50 g / cm ^3, preferably bulk density is 0.75 g / cm ³ or less, more preferably ^{0.50 ~ 0.70g / cm 3, 0.55} ~ 0.65g / Cm ³ is particularly preferred. Even if the bulk density is small, the surface area is not necessarily large if the particle diameter is large. The temperature changing substance 30 in this configuration preferably has an average particle diameter (JIS K 1474-2007 median diameter) of 200 to 600 μm.

The basis weight of the temperature change substance 30 may be 50 to 1000 g / m ² , preferably 300 to 700 g / m ² . If the basis weight of the temperature change substance 30 is less than 50 g / m ² , the change in temperature is not appreciably apparent, and if it exceeds 1000 g / m ² , the effect is not only saturated but also the cost increases.

Next, the principle of fixing the temperature change material 30 to the fiber assembly layer 31 ′ will be specifically described with reference to FIG. 6.

FIG. 6 is a cross-sectional view of the fiber assembly layer 31 ′ in which the temperature change substance 30 portion is enlarged. The temperature change substance 30 is formed by forming a sheet-like melt-solidified body 36 by solidifying a granular material 35, which is a particulate matter of the temperature change substance 30, after being partially melted by heating. Is fixed to the fiber assembly layer 31 ′. More specifically, based on the inventor's knowledge that when the temperature change substance 30 is heated and melted, it has adhesiveness to other members, this property is used to heat and melt a part of the temperature change substance 30. As a result, the melt adheres to fibers such as pulp fibers in the surrounding fiber assembly layer 31 ′, and also adheres to or fuses with the granular material 35 of the temperature change material 30 that is not heated and melted, and then melts and solidifies by solidification. The body 36 is formed, and the granular body 35 of the temperature change substance 30 is fixed to the fiber assembly layer 31 ′.

As a method of forming the temperature change material 30 integrally with the fiber assembly layer 31 ′, the particulate matter of the temperature change material 30 is sprayed from the aggregate of pulp fibers or the like forming the fiber assembly layer 31 ′. Thus, it is preferable to form the temperature change member 31 as a layer of the temperature change substance 30 in the upper layer portion of the fiber assembly layer 31 ′. Although a method of mixing the temperature change substance 30 at the same time when forming the aggregate of the fiber aggregate layer 31 ′ can also be adopted, it is preferable to spray the fiber aggregate layer 31 ′ later because it is easier to form the layer in the upper layer portion.

In addition, the temperature changing member 31 forms a sheet (laminate) including the temperature changing substance 30 in a separate process, cuts this to an appropriate length, and arranges it on the absorber 13. You may form integrally.

The method for heating the temperature change material 30 includes, for example, a method in which a member including the temperature change material 30 is passed through a high-temperature air-through dryer, or the temperature change material 30 is included in a gap between a pair of rolls including a high-temperature roll. A method of passing a member or a method of pressing a high-temperature roll against a member containing the temperature change substance 30 can be used.

Here, it is preferable that at least the temperature change substance 30 to be heated and melted has a viscosity at the time of melting of 5 to 80 P (poise). Therefore, it is preferable to use a temperature change substance that can be melted to have a viscosity of 5 to 80 P in a temperature range of 70 to 130 ° C. The viscosity is not necessarily limited to this range, but if the viscosity is lower than 5P, the temperature change substance 30 diffuses over a wide range at the time of melting, whereas if the viscosity is higher than 80P, the fluidity at the time of melting is poor. Even if it melts, it stays on the spot, so that no good sheet-like melted solidified body 36 is formed, and there is a possibility that the temperature change substance 30 cannot be fixed.

Subsequently, a specific method for fixing the granular material of the temperature change substance 30 to the fiber assembly layer 31 ′ will be described in detail with reference to FIGS. 7 to 10.

In the form shown in FIG. 7, two or more types of temperature change substances of two or more types having different particle diameters, that is, a relatively large-diameter granule 35 </ b> A and a relatively small-diameter granule 35 </ b> B in the illustrated example. 30 (see FIG. 1A), and then the fiber aggregate layer 31 ′ is heated to heat and melt the relatively small-diameter particles 35B, thereby completely completing the relatively large-diameter particles 35A. It is fixed to the fiber assembly layer 31 ′ without being melted into the fiber (see FIG. 5B). In the present embodiment, even with the same temperature change material 30, the small-diameter granule 35 </ b> B is mainly melted by heating by utilizing the fact that the one having a smaller particle size is easier to melt than the one having a larger particle size, The melt-solidified body 36 is formed.

The relatively small-diameter granule 35B may have a particle size that melts earlier than the relatively large-diameter granule 35A when heated. It is desirable that For example, when the average particle size of the granular material 35A is 500 μm, the average particle size of the granular material 35B is preferably about 200 μm.

Further, when the particles 35A and 35B are spread on the fiber assembly layer 31 ′, as shown in FIG. 7A, a layer of the particles 35B is formed, and the layer of the particles 35A is formed thereon. It is formed on the diaper surface side. Here, the layer of the granular material 35B and the layer of the granular material 35A are close to each other or partially overlapped. Thereby, as shown in FIG. 5B, the granule 35A on the diaper surface side can be fixed to the melt-solidified body 36 formed by heating and melting the granule 35B and then solidifying. Further, in order to ensure the fixing of the granular body 35A, it is preferable that the relatively small diameter granular body 35B is dispersed in a larger weight ratio than the relatively large diameter granular body 35A. Further, it is also preferable to disperse the relatively small-diameter particles 35B before the relatively large-diameter particles 35A.

In addition, when the difference between the granular materials 35A and 35B is only the average particle diameter, 35A and 35B may be formed as separate layers as described above, but when these are mixed to form a layer, The granular materials 35A and 35B cannot be distinguished from each other. Even in such a case, if the particle size distribution of the mixture of the granular materials 35A and 35B has two main distribution ranges of large particles and small particles, the effect of this embodiment can be obtained.

In the form shown in FIG. 8, the granular material 35 of the temperature change substance 30 is sprayed on the fiber aggregate layer 31 ′ (see FIG. 8A), and then the fiber aggregate layer 31 is heated by heating from the back side of the absorber. A part of the granular material 35 located near the back surface side of 'is heated and melted and solidified, so that the non-heat-melted temperature change substance 30 located near the fiber aggregate layer surface side is fixed to the fiber aggregate layer 31'. (See (B) in the figure). At this time, in order to prevent the granular material 35 positioned closer to the fiber aggregate layer surface side from being heated and melted, cooling from the fiber aggregate layer surface side may be performed during heating from the back surface side. As a result, as shown in FIG. 8B, the granular material 35 positioned closer to the diaper surface side can be fixed by the melt-solidified material 36 formed inside the fiber assembly layer 31 '.

In the form shown in FIG. 9, two or more types of temperature-changing substances are included in the fiber assembly layer 31 ′, that is, two or more types having different melting points; 30 (see FIG. 1A), and then the fiber aggregate layer 31 ′ is heated to heat and melt the granular material 35C, and then solidified, whereby the granular material having a relatively high melting point that is not heated and melted. 35A is fixed to the fiber assembly layer 31 ′ (see FIG. 5B). Also in this case, similarly to the embodiment shown in FIG. 7, as shown in FIG. 9A, the particles 35A are dispersed so that the layer of the granules 35A is formed on the layer of the particles 35C to be melted. . In addition, the granular material 35C having a relatively low melting point is sprayed more in a weight ratio than the granular material 35A having a relatively high melting point. In this case, the melting point of the granule 35C having a relatively low melting point is preferably 130 ° C. or less, and the melting point of the granule 35A having a relatively high melting point is preferably 10 ° C. or more, specifically 130 ° C. The above is preferable.

The form shown in FIG. 10 is a state in which the temperature change material 30 previously heated and melted is applied to the fiber assembly layer 31 ′ to form the melt layer 35D, and before the melt layer 35D is solidified, The granular material 35A is fixed to the fiber aggregate layer 31 ′ by spraying the granular material 35A of the temperature change substance 30 (see FIG. 5B). In this embodiment, since the temperature-changing substance 30 previously melted is applied to the fiber aggregate layer 31 ′, it is not necessary to heat the fiber aggregate layer 31 ′ in a state in which particles of the temperature-change substance 30 are dispersed, and manufacturing is easy. become.
In the illustrated example, the temperature changing member 31 is provided at a position corresponding to the defect portion 32, that is, at the center in the width direction of the intermediate portion in the longitudinal direction of the absorber 13, but left and right except for both side portions and the center portion in the width direction. May be provided at the middle part, the front end part or the rear end part in the longitudinal direction.

[Example of arrangement of temperature change member 31]
Next, arrangement examples according to the first to twelfth examples of the temperature change member 31 will be described with reference to FIGS. 11A to 21A are plan views showing only the relationship between the absorber 13 and the temperature changing member 31, and FIG. 11B is an enlarged view showing a cross section of the paper diaper 1 taken along the line BB. FIG. However, the three-dimensional gather BS is omitted in FIGS. 11 to 21B.

As shown in FIGS. 2 and 3, the first embodiment is absorbed between the top sheet 11 and the back sheet 12 in the middle part (inside) in the longitudinal direction and the width direction of the absorbent body 13 as described above. An open defect portion 32 (32A) that does not include the body 13 is formed, and a temperature change member made of a molded body of the temperature change substance 30 or a sheet-like material carrying the temperature change substance 30 in the defect portion 32 (32A). 31A is provided, and the absorber 13 and the temperature change member 31A are integrally surrounded by the encapsulating sheet 14.

In the second embodiment, as shown in FIG. 11, the defect portion 32A is formed inside the absorber 13, and the absorber 13 is surrounded by the encapsulating sheet 14, and then inside the defect portion 32A. In this structure, the temperature change member 31 </ b> A is disposed on the encapsulating sheet 14 surrounding the absorber 13.

In the third embodiment, as shown in FIG. 12, the defect portion 32A is formed inside the absorber 13, and a temperature change member 31B made of a granular material of the temperature change substance 30 is disposed in the defect portion 32A. The absorber 13 and the temperature change member 31B are integrally surrounded by the encapsulating sheet 14.

In the fourth embodiment, as shown in FIG. 13, the defect portion 32A is formed inside the absorber 13, and a temperature change member 31A is disposed so as to cover the defect portion 32A from the surface side. The body 13 and the temperature change member 31 </ b> A are integrally surrounded by the encapsulating sheet 14.

As shown in FIG. 14, the fifth embodiment is a slit-like defect portion in which the absorber 13 is not interposed between the top sheet 11 and the back sheet 12 along the longitudinal direction in the intermediate portion in the width direction of the absorber 13. 32B is formed, and a temperature change member 31A having a length substantially equal to that of the absorber 13 is disposed in the defect 32B. The absorber 13 and the temperature change member 31A are integrally surrounded by the encapsulating sheet 14. It is a structured. In addition, it is preferable that the formation position of the slit-shaped defect part 32 </ b> B is the center position in the width direction of the absorber 13.

As shown in FIG. 15, in the sixth embodiment, the defect portion 32A is formed inside the absorber 13, and the temperature is substantially equal to that of the absorber 13 so as to cover the defect portion 32A from the surface side. The changing member 31A is disposed, and the absorber 13 and the temperature changing member 31A are integrally surrounded by the encapsulating sheet 14.

As in the first to sixth embodiments, at least intermediate portions of the absorbent body 13 in the longitudinal direction and the width direction are missing portions 32A and 32B in which the absorbent body 13 is not interposed between the top sheet 11 and the back sheet 12. When the temperature change members 31A and 31B are formed so as to overlap with the deficient portions 32A and 32B, more contact between the temperature change member and the body fluid occurs during excretion, and temperature change due to the temperature change substance occurs. It will be effective, and the wearer's perception will be performed in a local area where the discomfort due to temperature changes is most easily detected. Change can be perceived.

In the seventh embodiment, as shown in FIG. 16, constricted missing portions 32C and 32C are respectively formed at both side ends of the crotch region of the absorbent body 13, and the portion near the center of the missing portion 32C in the diaper width direction is the surface. The temperature change member 31 </ b> A is disposed between the defect portions 32 </ b> C and 32 </ b> C, and the absorber 13 and the temperature change member 31 </ b> A are integrally surrounded by the encapsulating sheet 14.

In the eighth embodiment, as shown in FIG. 17, constricted defects 32C and 32C are formed at both ends of the absorber 13, and the defects 32C and 32C are covered from the surface side and absorbed by both sides. The temperature change members 31A and 31A are arranged along the longitudinal direction of the body 13 and over the entire length thereof, and the absorber 13 and the temperature change member 31A are integrally surrounded by the encapsulating sheet 14. is there.

In the ninth embodiment, as shown in FIG. 18, constricted defects 32C and 32C are formed at both ends of the absorber 13, and the particles of the temperature change substance 30 are respectively formed in the defects 32C. A temperature change member 31B composed of a body is disposed, and the absorber 13 and the temperature change member 31B are integrally surrounded by the encapsulating sheet 14.

In the tenth embodiment, as shown in FIG. 19, constricted defects 32C and 32C are formed at both side ends of the absorber 13, and the temperature change member 31A is formed on both sides from the back side of the absorber 13. The absorbent body 13 and the temperature change member 31A are integrally surrounded by the encapsulating sheet 14 by being folded back and disposed so as to extend to a position covering the surface side of the defect portion 32C.

In the seventh to tenth embodiments, the temperature-changing members 31A and 31B hit the base of the foot where the temperature change is easily felt by forming the constricted defect portions 32C and 32C on both side ends of the absorber 13. become. Since the side part of the absorbent body is a part sandwiched between the thighs of the wearer, it is easy to be in close contact with the wearer in any posture, and therefore the excreted body fluid is disposed on the surface side of the temperature change member and The wearer can sense the temperature change in any posture by the side arrangement portion, and the childcare person or the like can sense the temperature change by the back side arrangement portion.

In the eleventh embodiment, as shown in FIG. 20, a defect portion 32A is formed inside the absorber 13, and the temperature change member 31A that is long in the lateral direction is disposed on the back surface side of the absorber 13, It is a structure that is folded back to the surface side at both sides and arranged to encapsulate the entire absorbent body 13. In this embodiment, the defect portion 32 is provided inside the absorbent body 13, but it is also preferable to provide the defect portion 32 on both sides of the crotch region of the absorbent body 13 or on both ends or one end in the longitudinal direction (front-rear direction). It is. In addition, it is desirable to use crepe paper or core wrap nonwoven fabric surrounding the absorbent body 13 instead of the encapsulating sheet 14 as the temperature changing member 31A, and the temperature changing substance 30 is applied only to a desired portion by a method such as application. May be.

In the tenth and eleventh embodiments, the body 13 excreted from the surface side allows the wearer to sense the temperature change by the surface side arrangement portion of the temperature change member, even if the absorber 13 does not have the defect portion 32, Temperature changes can be detected by a child-care worker or the like by the rear surface side arrangement portion.

In the twelfth embodiment, as shown in FIG. 21, defect portions 32D and 32D are formed at both longitudinal ends (front and rear end portions) of the absorber 13, and the temperature change member 31A is formed on the lower surface side of the defect portions 32D and 32D. The absorber 13 and the temperature change member 31 </ b> A are integrally surrounded by the encapsulating sheet 14. If comprised in this way, it will become possible to make a wearer, a child care worker, etc. sense a temperature change effectively now at the time of excretion in the state which laid down. In this embodiment, the temperature change member 31A may cover the defect portions 32D and 32D from the upper surface side, but most of the region that causes the temperature change when excreted in a lying state is laid under the body. Therefore, it is preferable that the temperature change member 31A covers the defect portions 32D and 32D from the bottom so that the temperature change member 31A can be touched from the back side so that the temperature change can be sensed. In addition, although it is not essential, providing the said defect | deletion part 32A also in the inside of the absorber 13 is a preferable modification so that the effect of this invention may be acquired reliably also in the excretion in the standing state. Such an effect is also obtained in the fifth embodiment shown in FIG. Moreover, in the example of FIG. 21, although the defect | deletion part 32D is provided in both the abdominal side and the back | dorsal side (both ends) of the absorber 13, either one (one end) may be sufficient. Further, when the temperature change member 31A is further extended from both longitudinal ends (front and rear end portions) of the absorbent body 13 as shown in the illustrated example, the missing portion 32D of the absorbent body 13 is greatly enlarged at both longitudinal ends. Even if it is not provided, the area of the region where the temperature change occurs on both the front surface side and the back surface side can be sufficiently large, which is preferable. In this case, it is preferable to form a flap part on which at least the front side F and the rear side B of the absorbent main body 10 do not interpose the absorbent body 13. Thereby, it is possible to prevent the temperature changing member 31A from coming out. In addition, when the temperature change member 31A further extends from both longitudinal ends (front and rear end portions) of the absorbent body 13, the deletion portions 32D and 32D at both longitudinal ends are not necessarily provided.

In order to demonstrate the effect of temperature change by the temperature change member 31, an absorbent body having a length of 395 mm and a width of 140 mm, in which a superabsorbent polymer having a basis weight of 150 g / m ² is mixed with a pulp having a basis weight of 110 g / m ² . The temperature change substance (sorbitol: solubility in 100 ml of water at a temperature of 20 ° C., energy change minus 26 cal / g) is sprayed on the surface center length of 200 mm and width of 100 mm in various weights, and the absorption The surface temperature of this dripping site when 50cc artificial urine (37 ° C) was dripped in about 3 seconds from a height of about 15cm to a paper diaper test body in which the body and temperature change member were integrally surrounded by crepe paper The test which measures the time-dependent change of this with a non-contact thermometer was implemented. The result is as shown in FIG. In addition, it measured similarly about the test body which does not spray the said temperature change member as a comparative example.

In addition, as a result of observing the reaction of infants when wet tissues with different temperatures are applied to each part of the infant's body, unpleasant reactions when wet tissues with a temperature difference of about 5 ° C or more are continuously exchanged and applied. It became clear to show. Therefore, it can be said that it is necessary to give a temperature change of about 5 ° C. or more than the temporal change of the temperature change in the conventional disposable diaper in order to make the infant feel uncomfortable due to the temperature change. In addition, in order to clearly recognize the cause of the discomfort due to the temperature change, the discomfort must be obtained within about 30 seconds from the time of excretion. From this, it can be presumed that in order to provoke discomfort to the infant at the time of excretion, any temperature difference of about 5 ° C. from the conventional paper diaper can be obtained within about 30 seconds after the excretion. It should be noted that the site where the infant's reaction frequently appears was the urination mouth, buttocks, the base of the leg, etc., and the urination mouth showed the most remarkable reaction.

From the above, as shown in FIG. 22, a temperature difference of about 5 ° C. compared to Comparative Example 1 is obtained in about 30 seconds after the artificial urine is dropped, as in Example 3, Example 4 and In Example 5, the basis weight of the temperature change substance (sorbitol) is 450 g / m ² or more.

[Other examples]
(1) In the above embodiment, the present invention has been described by taking a pants-type disposable paper diaper as an example, but the present invention can be similarly applied to a tape-type disposable paper diaper. Although it can be applied to both infants and adults, it is preferably applied to training pants for promoting infants to leave their diapers.
(2) In the above embodiment, the outer sheet 20 is a two-layer nonwoven fabric sheet in which the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are bonded with a hot melt adhesive or the like. The structure of the exterior sheet can be arbitrarily adopted.

(3) In the above embodiment, the top sheet 11, the back sheet 12, and the gathered non-woven fabric 16 all have the structure in which the absorbent body is entrained, but the absorbent body 13 may be entrained only in the back sheet 12 or any of the sheets. The absorber 13 may not be caught. When only the back sheet 12 is involved, the top sheet 11 and the gathered nonwoven fabric 16 form side flaps together with the exterior sheet 20, but the exterior sheet 20 has liquid impermeability, or the exterior sheet 20 and the back sheet 12 It is sufficient that another liquid-impermeable sheet is interposed between them (this liquid-impermeable sheet is preferably a square or hourglass shape including a surface sheet). In addition, when the back sheet 12 is not caught, a liquid-impermeable coating sheet different from the back sheet 12 extends from the back surface side to the front surface side of the absorber side portion and is fixed so as to sandwich the side portion. That's fine.
(4) In the above embodiment, a separate sheet or the like is provided as the temperature change member 31. However, in a paper diaper provided with a so-called second sheet, this second sheet may also serve as the temperature change member 31. For example, the temperature change substance 30 may be carried between the layers or gaps of a conventional second sheet. In this case, after the temperature change substance 30 is dissolved, it can function as a normal second sheet. In each of the above embodiments, a second sheet may be separately provided between the top sheet 11 and the absorber 13.

It is a product state appearance view of disposable paper diaper 1 concerning the present invention. It is the development view. FIG. 3 is a view taken along the line III-III in FIG. 2. It is an exploded view of the disposable paper diaper. FIG. 3 is a development view of the exterior sheet 20. It is sectional drawing of the temperature change member 31 which expanded the temperature change substance 30 part. (A) is a cross-sectional view of the temperature change member 31 before heating, and (B) is an enlarged view of the temperature change material 30 after heating. (A) is a cross-sectional view of the temperature change member 31 before heating, and (B) is an enlarged view of the temperature change material 30 after heating. (A) is a cross-sectional view of the temperature change member 31 before heating, and (B) is an enlarged view of the temperature change material 30 after heating. (A), (B) is sectional drawing of the temperature change member 31 which expanded the temperature change substance 30 part which shows the formation procedure of the temperature change member 31. FIG. FIG. 2A is a plan view of the absorbent main body 10 and FIG. 2B is a BB line arrow view showing a second arrangement form example of the temperature change member 31. A third arrangement example of the temperature change member 31 is shown, (A) is a plan view of the absorbent main body 10, and (B) is a view taken along the line BB. The 4th example of arrangement | positioning form of the temperature change member 31 is shown, (A) is a top view of the absorptive main body 10, (B) is the BB line arrow directional view. The 5th example of arrangement | positioning form of the temperature change member 31 is shown, (A) is a top view of the absorptive main body 10, (B) is the BB line arrow directional view. FIGS. 6A and 6B show a sixth example of arrangement of the temperature change member 31, wherein FIG. 6A is a plan view of the absorbent main body 10 and FIG. FIGS. 7A and 7B show a seventh example of arrangement of the temperature change member 31. FIG. 9A is a plan view of the absorbent main body 10 and FIG. FIGS. 8A and 8B show an eighth arrangement form example of the temperature change member 31. FIG. 8A is a plan view of the absorbent main body 10 and FIG. FIGS. 9A and 9B show a ninth arrangement form example of the temperature change member 31. FIG. 9A is a plan view of the absorbent main body 10 and FIG. FIGS. 10A and 10B show a tenth configuration example of the temperature change member 31, in which FIG. 9A is a plan view of the absorbent main body 10, and FIG. FIGS. 11A and 11B show an eleventh example of arrangement of the temperature change member 31, in which FIG. 9A is a plan view of the absorbent main body 10, and FIG. The twelfth arrangement example of the temperature change member 31 is shown, (A) is a plan view of the absorbent main body 10, and (B) is a view taken along the line BB. 5 is a graph showing the relationship between time and temperature with respect to the basis weight of the temperature change substance 30.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 10 ... Absorbent main body, 11 ... Surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Encapsulated sheet, 16 ... Gathered nonwoven fabric, 17 ... Filamentary elastic member, 20 ... Exterior sheet, 20A ... upper layer nonwoven fabric, 20B ... lower layer nonwoven fabric, 21 ... side joint edge, 23 ... around waist opening, 24 ... waist elastic elastic member, 25 ... waist elastic elastic member, 29 ... leg circumference cut line, 30 ... temperature change Substance, 31 / 31A / 31B ... Temperature change member, 32 / 32A / 32B / 32C ... Deficient part, 35 / 35A / 35B / 35C ... Granular body of temperature change member, 36 ... Mold-solidified body, B ... Back body, F ... the front body, BS ... three-dimensional gather

Claims (14)

1. A granular material of a temperature-changing substance in which an absorber is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a temperature change that can be sensed by the wearer by contact with the body fluid Or a disposable diaper provided with a temperature change member made of any of the molded body or a sheet-like material carrying a temperature change material,
   At least a part of the temperature change member is disposed such that the absorber is not interposed between the top sheet and the absorber, and the absorber is not interposed between the back sheet and the back sheet. Disposable diapers.
2. The absorbent body has a defect portion between which the absorber is not interposed between the top sheet and the back sheet, and the temperature change member is disposed so as to overlap at least a part of the defect portion in plan view. The total basis weight of the constituent members arranged between the temperature change member and the outer surface of the disposable diaper in the defective portion is 100 g / m ² on both the front side and the back side of the temperature change member. The disposable diaper according to claim 1, which is the following.
3. The disposable diaper according to claim 2, wherein the defect portion is formed at least in an intermediate portion in a longitudinal direction and a width direction of the absorbent body.
4. The disposable diaper according to claim 1, wherein the temperature change member is fixed to the temperature change member by heating and melting a part of the particulate matter of the temperature change material.
5. The disposable diaper according to claim 4, wherein the particulate matter of the temperature change substance has a bulk density of 50% or less of a true density and an average particle diameter of 200 to 600 µm.
6. 5. The disposable diaper according to claim 4, wherein the temperature change substance to be melted by heating has a viscosity of 5 to 80 P (poise) in a temperature range of 70 to 130 ° C.
7. The temperature change member includes particulates of two or more kinds of the temperature change materials having different particle diameters, and is not heated and melted by heating and melting the temperature change materials having a relatively small particle diameter. The disposable diaper of Claim 4 currently fixed to the said temperature change member.
8. A part of the temperature change material is heated and melted by heating from the back side of the temperature change member or by cooling from the back side of the temperature change member simultaneously with cooling from the front side of the temperature change member. The disposable diaper according to claim 4, wherein the temperature-changing substance that is not heated and melted and located near the surface of the temperature-changing member is fixed to the temperature-changing member.
9. The temperature change member includes two or more kinds of particulate matter of the temperature change substance having different melting points, and the temperature change substance that is not heated and melted is obtained by heating and melting the temperature change substance having a relatively low melting point. The disposable diaper of Claim 4 currently fixed to the temperature change member.
10. The temperature change member is applied to the temperature change material previously heated and melted, and then the temperature change material is fixed to the temperature change member by spraying particulate matter of the temperature change material on the upper layer. The disposable diaper according to claim 4.
11. The disposable diaper according to claim 2, wherein the deficient part is formed at both side ends of the crotch part of the absorbent body.
12. The disposable diaper according to claim 2, wherein the defect portion is formed at both ends or one end in the longitudinal direction of the absorbent body.
13. The disposable diaper according to claim 1, wherein a side portion of the temperature change member disposed on a lower surface or an upper surface of the absorbent body is arranged so as to wind the frame on the side portion of the absorbent body or enclose the absorbent body. .
14. The disposable diaper according to any one of claims 1 to 13, wherein the temperature change member contains a superabsorbent polymer.

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