EP0394134A1 - Process for marking a flexible structure, flexible structure obtained and its use in a process for marking a cellulose web - Google Patents
Process for marking a flexible structure, flexible structure obtained and its use in a process for marking a cellulose web Download PDFInfo
- Publication number
- EP0394134A1 EP0394134A1 EP90401066A EP90401066A EP0394134A1 EP 0394134 A1 EP0394134 A1 EP 0394134A1 EP 90401066 A EP90401066 A EP 90401066A EP 90401066 A EP90401066 A EP 90401066A EP 0394134 A1 EP0394134 A1 EP 0394134A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- marking
- felt
- flexible structure
- marked
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229920002678 cellulose Polymers 0.000 title description 3
- 239000001913 cellulose Substances 0.000 title description 2
- 239000000123 paper Substances 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000004744 fabric Substances 0.000 claims abstract description 7
- 239000002655 kraft paper Substances 0.000 claims abstract description 7
- 238000005530 etching Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 7
- 238000007639 printing Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229920002994 synthetic fiber Polymers 0.000 claims description 6
- 239000012209 synthetic fiber Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000000280 densification Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229920005749 polyurethane resin Polymers 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 claims 1
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000003550 marker Substances 0.000 description 5
- 239000004952 Polyamide Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 238000009941 weaving Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 210000002268 wool Anatomy 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 2
- 235000010980 cellulose Nutrition 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011122 softwood Substances 0.000 description 2
- -1 wool Substances 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 229920000914 Metallic fiber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 241001236212 Pinus pinaster Species 0.000 description 1
- 235000005105 Pinus pinaster Nutrition 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 206010040925 Skin striae Diseases 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 208000031439 Striae Distensae Diseases 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000000181 anti-adherent effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/44—Watermarking devices
Definitions
- the present invention relates to a method for marking a flexible structure, the marked flexible structure thus obtained and its use in a method for marking a cellulosic sheet.
- Another way to mark the basket is to emboss the sheet still wet, before or in the dryer of the machine, using knurling wheels watermarks or a marker felt marker, exerting a mechanical effect on the sheet and thus leaving an imprint by modifying the relief.
- rods are simply formed by parallel lines giving the paper a laid appearance. They are obtained with the aid of a frictional marker with a particular weaving of parallel longitudinal lines.
- the plaintiffs therefore sought a means of obtaining, without modifying the machines and the methods of manufacturing felts, various patterns in size, shape and arrangement, on the surface of a cellulosic sheet.
- the present invention therefore relates to a flexible structure which can be likened to a joinable or endless belt, marked by an engraving or printing process.
- the flexible structure can be a paper machine drying cloth or a felt usable in the wet part such as a coating felt, or even a drying felt or else a vellum or orchard friction felt.
- the felt can be a woven, non-woven structure or a combination of the two, composed of natural fibers, synthetic fibers or their mixtures.
- the flexible structure can also be a canvas composed of synthetic and / or metallic threads.
- a mixed felt of natural fibers such as wool
- synthetic fibers such as polyamide, polyester fibers or acrylic fibers.
- non-woven felt mention may be made of a needled felt such as a 100% synthetic felt made of polyester fibers.
- the marked friction felt according to the invention can be a felt having a uniform texture making it possible to obtain a paper of vellum appearance or may also have a particular weaving, for example of parallel longitudinal lines giving the paper a laid appearance.
- the flexible structure according to the invention is obtained by a method of marking by etching, that is to say removal of material or densification or by printing or coating, that is to say surface addition of material.
- the invention therefore also relates to the method of marking a flexible structure mentioned above.
- the etching process can be a densification process by pressure or fusion or both jointly or by removal of material; it can therefore be a mechanical, chemical or thermal process, the latter being carried out using a heated form, applied with pressure, at a temperature above the melting temperature of at least one of the constituents of the flexible structure.
- the marking process of the flexible structure can also be a printing or coating process, that is to say a superficial addition of material, by stencil printing-coating, serigraphy, transfer or any other means making it possible to apply the selected patterns to the surface of the flexible structure, with good definition.
- the flexible structure has a relief on the face opposite to the mark, this will be locally or uniformly removed by application of material identical to or different from that used for marking.
- the material or materials used for printing these patterns are chosen to be resistant to hydrolysis in the medium slightly acidic or slightly basic, resistant to the constraints of temperature, pressure, deformation and abrasion, resulting from the manufacturing process of the cellulosic sheet. Furthermore, these materials must be flexible enough to follow without breaking or altering the curvatures of the felt or the canvas in its continuous path in the paper machine. These materials must also adhere perfectly to the natural and / or synthetic fibers of the flexible structure and be durably linked to them.
- these materials are chosen from thermoplastic, thermosetting or elastomeric synthetic resins.
- the resins chosen must not creep or melt at a temperature below 140 ° C.
- the materials which can be used are classified in particular among polyolefinic, polyvinyl, halogenated polyolefin, polystyrene, polyesters, polyurethanes, silicones or elastomers of styrene-butadiene, butadiene-acrylonitrile or polychloroprene resins.
- the resin used is applied in the molten state or in the state of a self-crosslinking aqueous dispersion (latex) or in solution in a solvent or in the pure state, in the form of '' a paste with one or more components.
- the preparation used for marking the flexible structure may contain any additives making it possible to adjust the viscosity or itself. confer the particular properties sought, such as antioxidants, vulcanizing agents, dyes, mineral or organic pigments, etc.
- the preferred resins according to the invention, for use in marking the flexible structure are polyurethane resins.
- the polyurethanes used can be in the form of reactive or thermoplastic mixtures, in 100% paste, in one-component aqueous dispersion or in one-component or two-component solution in an organic solvent.
- the present invention also relates to the use of the marked flexible structure thus obtained, in a process for marking a cellulosic sheet.
- the cellulosic sheet may be a cardboard or a paper intended for printing, writing, packaging or any other processing use such as impregnation, coating, laminating on sheet or film, polyolefin extrusion-coating, etc.
- a cellulosic sheet is made using as main raw material for example, combinations of softwood pulp and hardwood pulp treated with soda or bisulfite, bleached or semi-bleached.
- the raw material used is preferably unbleached softwood pulp obtained by the sulphate process.
- the paper may also contain in its composition other types of fibers and papermaking adjuvants, commonly used and known to those skilled in the art.
- the paper marking process according to the invention is implemented by pressing the marked flexible structure defined above against the sheet of paper, thus allowing the marks to be transferred onto the latter.
- a preferred application of the marked flexible structure according to the invention is its application to a method for marking unbleached brown kraft paper.
- the marks carried by the frictionneur, vergeur or plain texture felt reproduce on the sheet of paper by pressing the felt against the non-friction side of the sheet, at the time of its application against the said drying cylinder.
- Marking of intaglio letters is carried out on a sample of coating felt of composition 100% polyamide fibers.
- a wet sheet is drawn from an unbleached pine kraft paste refined at 23 ° SR, for a final grammage after drying, of approximately 70 g / m2. This sheet is pressed against the previous marked felt, to a final dryness of 33% and then dried in contact with the same felt, in the Rapid-Köthen dryer.
- the sheet resulting from the formette in the preceding test is previously pressed by passing through a cylinder press, under a linear pressure of 12 kg / cm.
- a mark is thus obtained having an average allowance of approximately 1mm.
- a layer of the same resin is applied to the back of the felt using a doctor blade.
- This felt is installed in a combined paper machine as a friction felt, the marked side being applied against the sheet of paper in contact with the Yankee drying cylinder.
- An unbleached kraft paper is made from a maritime pine pulp, refined at a SR of 25, to which 3 kg / t of resin soap and aluminum sulphate for a pH of 4 have been added, 8 in the fibrous suspension at the machine head.
- the marker felt is pressed against the sheet of paper then having a dryness of 60%, by a friction press under a linear pressure of 100 kg / cm.
- the sheet On leaving the Yankee cylinder, the sheet has a residual water content of 7.2% and an average grammage of 50 g / m2.
Abstract
Description
La présente invention concerne un procédé de marquage d'une structure souple, la structure souple marquée ainsi obtenue et son utilisation dans un procédé de marquage d'une feuille cellulosique.The present invention relates to a method for marking a flexible structure, the marked flexible structure thus obtained and its use in a method for marking a cellulosic sheet.
Les procédés pour marquer les papiers au moment de leur fabrication sont aujourd'hui relativement limités dans leur nombre et leurs possibilités d'application.The methods for marking papers at the time of their manufacture are today relatively limited in their number and their possibilities of application.
L'homme de l'art connaît bien le filigranage réalisé dans la partie humide de la machine à papier, par des empreintes portées, soit par la toile de formation d'une forme ronde, soit par un rouleau égoutteur se trouvant sur la toile de formation d'une machine à table plate du type Fourdrinier.Those skilled in the art are well aware of the watermarking carried out in the wet part of the paper machine, by fingerprints carried either by the forming fabric of a round shape, or by a drip roller being on the canvas. formation of a flat table machine of the Fourdrinier type.
Un autre moyen de marquer le panier consiste à embosser la feuille encore humide, avant ou dans la sécherie de la machine, à l'aide de molettes filigraneuses ou d'un feutre coucheur marqueur, exerçant un effet mécanique sur la feuille et laissant ainsi une empreinte par modification du relief.Another way to mark the basket is to emboss the sheet still wet, before or in the dryer of the machine, using knurling wheels watermarks or a marker felt marker, exerting a mechanical effect on the sheet and thus leaving an imprint by modifying the relief.
Ces procédés sont généralement appliqués pour l'identification par marquage des papiers fabriqués à partir de celluloses blanchies, pour des usages fiduciaires ou en impression-écriture.These processes are generally applied for the identification by marking of papers made from bleached celluloses, for fiduciary or printing-writing uses.
Hormis les procédés décrits ci-dessus, on ne connaît pas actuellement de moyen simple pour apposer sur des papiers d'emballage tels que des papiers kraft ou sur des papiers d'impression-écriture, des motifs constituant des marques diverses ou graphismes autres que les marques de tissage ou vergeures traditionnelles.Apart from the methods described above, no simple means is currently known for affixing on packaging papers such as kraft papers or on printing-writing papers, patterns constituting various marks or graphics other than the weaving marks or traditional rods.
Ces vergeures sont simplement constituées par des lignes parallèles conférant au papier un aspect vergé. Elles sont obtenues à l'aide d'un feutre frictionneur vergeur présentant un tissage particulier de raies longitudinales parallèles.These rods are simply formed by parallel lines giving the paper a laid appearance. They are obtained with the aid of a frictional marker with a particular weaving of parallel longitudinal lines.
Ce feutre frictionneur est intercalé le plus souvent entre la presse frictionneuse et la feuille encore humide qui est séchée dans la machine à papier par contact étroit avec un cylindre sécheur poli, dit "cylindre frictionneur" et conférant au papier une surface lisse dite "frictionnée".This friction felt is most often interposed between the friction press and the still wet sheet which is dried in the paper machine by close contact with a polished drying cylinder, called "friction cylinder" and giving the paper a smooth surface called "friction" .
Cependant, il est actuellement impossible, sans que cela entraîne des coûts extrêmement importants, de réaliser à la surface d'une feuille cellulosique, par ce moyen, des motifs autres que des vergeures ou autres marques de tissage, et notamment des dessins divers, car cela entraînerait des modifications importantes des machines de fabrication des feutres et des métiers à tisser et pose également des problèmes au niveau de la définition des motifs.However, it is currently impossible, without this entailing extremely high costs, to produce on the surface of a cellulosic sheet, by this means, patterns other than stretch marks or other weaving marks, and in particular various designs, because this would lead to major modifications to the machines for making the felts and the looms and also poses problems in terms of the definition of the patterns.
Les demanderesses ont donc recherché un moyen permettant d'obtenir, sans modifier les machines et les procédés de fabrication des feutres, des motifs divers en taille, en forme et en disposition, à la surface d'une feuille cellulosique.The plaintiffs therefore sought a means of obtaining, without modifying the machines and the methods of manufacturing felts, various patterns in size, shape and arrangement, on the surface of a cellulosic sheet.
C'est ainsi que les demanderesses ont découvert qu'il était possible d'incorporer dans une feuille cellulosique des dessins divers en taille, forme et disposition, à l'aide d'une structure souple pouvant être assimilée à une courroie jonctionnable ou sans fin, elle-même marquée par un procédé de gravure ou d'impression.Thus, the plaintiffs discovered that it was possible to incorporate into a cellulosic sheet various designs in size, shape and arrangement, using a flexible structure which can be likened to a joinable or endless belt. , itself marked by an engraving or printing process.
La présente invention a donc pour objet une structure souple pouvant être assimilée à une courroie jonctionnable ou sans fin, marquée par un procédé de gravure ou d'impression.The present invention therefore relates to a flexible structure which can be likened to a joinable or endless belt, marked by an engraving or printing process.
La structure souple, selon l'invention, peut être une toile de sécherie de machine à papier ou un feutre utilisable dans la partie humide tel qu'un feutre coucheur, ou encore un feutre sécheur ou bien un feutre frictionneur velin ou vergeur.The flexible structure, according to the invention, can be a paper machine drying cloth or a felt usable in the wet part such as a coating felt, or even a drying felt or else a vellum or orchard friction felt.
Le feutre peut être une structure tissée, non tissée ou une combinaison des deux, composée de fibres naturelles, de fibres synthétiques ou de leurs mélanges. La structure souple peut être également une toile composée de fils synthétiques et/ou métalliques.The felt can be a woven, non-woven structure or a combination of the two, composed of natural fibers, synthetic fibers or their mixtures. The flexible structure can also be a canvas composed of synthetic and / or metallic threads.
A titre de structure souple préférée, selon l'invention, on peut citer un feutre mixte en fibres naturelles, comme la laine, et fibres synthétiques, comme les fibres de polyamide, de polyester ou les fibres acryliques.As a preferred flexible structure, according to the invention, mention may be made of a mixed felt of natural fibers, such as wool, and synthetic fibers, such as polyamide, polyester fibers or acrylic fibers.
A titre de feutre non tissé, on peut citer un feutre aiguilleté tel qu'un feutre 100% synthétique en fibres de polyester.As non-woven felt, mention may be made of a needled felt such as a 100% synthetic felt made of polyester fibers.
Le feutre frictionneur marqué, selon l'invention, peut être un feutre présentant une texture unie permettant d'obtenir un papier d'aspect velin ou peut aussi présenter un tissage particulier, par exemple de raies longitudinales parallèles conférant au papier un aspect vergé.The marked friction felt according to the invention can be a felt having a uniform texture making it possible to obtain a paper of vellum appearance or may also have a particular weaving, for example of parallel longitudinal lines giving the paper a laid appearance.
La structure souple, selon l'invention, est obtenue par un procédé de marquage par gravure, c'est-à-dire enlèvement de matière ou densification ou par impression ou enduction, c'est-à-dire apport superficiel de matière.The flexible structure according to the invention is obtained by a method of marking by etching, that is to say removal of material or densification or by printing or coating, that is to say surface addition of material.
L'invention a donc également pour objet le procédé de marquage d'une structure souple mentionnée ci-dessus.The invention therefore also relates to the method of marking a flexible structure mentioned above.
Le procédé de gravure peut être un procédé de densification par pression ou fusion ou les deux conjointement ou par enlèvement de matière; il peut donc s'agir d'un procédé mécanique, chimique ou thermique, ce dernier étant réalisé à l'aide d'une forme chauffée, appliquée avec pression, à une température supérieure à la température de fusion de l'un au moins des constituants de la structure souple.The etching process can be a densification process by pressure or fusion or both jointly or by removal of material; it can therefore be a mechanical, chemical or thermal process, the latter being carried out using a heated form, applied with pressure, at a temperature above the melting temperature of at least one of the constituents of the flexible structure.
Le procédé de marquage de la structure souple peut également être un procédé d'impression ou enduction, c'est-à-dire d'apport superficiel de matière, par impression-enduction au pochoir, sérigraphie, transfert ou tout autre moyen permettant d'appliquer à la surface de la structure souple, avec une bonne définition, les motifs choisis.The marking process of the flexible structure can also be a printing or coating process, that is to say a superficial addition of material, by stencil printing-coating, serigraphy, transfer or any other means making it possible to apply the selected patterns to the surface of the flexible structure, with good definition.
Dans le cas où la structure souple présente un relief sur la face opposée à la marque, celui-ci sera localement ou uniformément supprimé par application de matière identique à ou différente de celle utilisée pour le marquage.In the case where the flexible structure has a relief on the face opposite to the mark, this will be locally or uniformly removed by application of material identical to or different from that used for marking.
Afin de pouvoir être utilisées dans le procédé de marquage d'une feuille cellulosique, la ou les matières utilisées pour l'impression de ces motifs sont choisies pour être résistantes à l'hydrolyse en milieu légèrement acide ou légèrement basique, résistantes aux contraintes de température, de pression, de déformation et d'abrasion, résultant du procédé de fabrication de la feuille cellulosique. Par ailleurs, ces matières doivent être suffisamment souples pour suivre sans cassure ni altération les courbures du feutre ou de la toile dans son parcours continu dans la machine à papier. Ces matières doivent également adhérer parfaitement aux fibres naturelles et/ou synthétiques de la structure souple et être durablement liées à celles-ci.In order to be able to be used in the process for marking a cellulosic sheet, the material or materials used for printing these patterns are chosen to be resistant to hydrolysis in the medium slightly acidic or slightly basic, resistant to the constraints of temperature, pressure, deformation and abrasion, resulting from the manufacturing process of the cellulosic sheet. Furthermore, these materials must be flexible enough to follow without breaking or altering the curvatures of the felt or the canvas in its continuous path in the paper machine. These materials must also adhere perfectly to the natural and / or synthetic fibers of the flexible structure and be durably linked to them.
Selon l'invention, ces matières sont choises parmi les résines de synthèse thermoplastiques, thermodurcissables ou élastomères.According to the invention, these materials are chosen from thermoplastic, thermosetting or elastomeric synthetic resins.
Ces résines doivent résister à l'hydrolyse en milieu légèrement acide ou alcalin, dans un domaine de pH compris entre 4 et 10, et en présence d'ions aluminium, fréquemment présents dans les procédés de fabrication des papiers et cartons.These resins must resist hydrolysis in a slightly acidic or alkaline medium, in a pH range of between 4 and 10, and in the presence of aluminum ions, frequently present in the processes for manufacturing paper and cardboard.
Par ailleurs, les résines choisies ne doivent pas fluer ou fondre à une température inférieure à 140°C.Furthermore, the resins chosen must not creep or melt at a temperature below 140 ° C.
Selon l'invention, les matières utilisables sont classées notamment parmi les résines polyoléfiniques, polyvinyliques, polyoléfines halogénées, polystyréniques, polyesters, polyuréthanes, silicones ou élastomères de styrène-butadiène, butadiène-acrylonitrile ou de polychloroprène.According to the invention, the materials which can be used are classified in particular among polyolefinic, polyvinyl, halogenated polyolefin, polystyrene, polyesters, polyurethanes, silicones or elastomers of styrene-butadiene, butadiene-acrylonitrile or polychloroprene resins.
Pour le marquage de la structure souple selon l'invention, la résine utilisée est appliquée à l'état fondu ou à l'état de dispersion aqueuse autoréticulable (latex) ou en solution dans un solvant ou à l'état pur, sous forme d'une pâte à un ou plusieurs composants. Outre la résine, la préparation utilisée pour le marquage de la structure souple peut contenir tous additifs permettant d'en régler la viscosité ou de lui conférer les propriétés particulières recherchées, tels qu'agents antioxydants, agents de vulcanisation, colorants, pigments minéraux ou organiques, etc...For the marking of the flexible structure according to the invention, the resin used is applied in the molten state or in the state of a self-crosslinking aqueous dispersion (latex) or in solution in a solvent or in the pure state, in the form of '' a paste with one or more components. In addition to the resin, the preparation used for marking the flexible structure may contain any additives making it possible to adjust the viscosity or itself. confer the particular properties sought, such as antioxidants, vulcanizing agents, dyes, mineral or organic pigments, etc.
Les résines préférées selon l'invention, pour servir au marquage de la structure souple, sont les résines polyuréthanes. Les polyuréthanes utilisés peuvent se présenter sous la forme de mélanges réactifs ou thermoplastes, en pâte à 100%, en dispersion aqueuse monocomposant ou en solution monocomposant ou bicomposant dans un solvant organique.The preferred resins according to the invention, for use in marking the flexible structure, are polyurethane resins. The polyurethanes used can be in the form of reactive or thermoplastic mixtures, in 100% paste, in one-component aqueous dispersion or in one-component or two-component solution in an organic solvent.
La présente invention a également pour objet l'utilisation de la structure souple marquée ainsi obtenue, dans un procédé de marquage d'une feuille cellulosique.The present invention also relates to the use of the marked flexible structure thus obtained, in a process for marking a cellulosic sheet.
La feuille cellulosique peut être un carton ou un papier destiné à l'impression, à l'écriture, à l'emballage ou tout autre usage de transformation tel qu'imprégnation, couchage, contrecollage sur feuille ou film, extrusion-couchage de polyoléfine, etc..The cellulosic sheet may be a cardboard or a paper intended for printing, writing, packaging or any other processing use such as impregnation, coating, laminating on sheet or film, polyolefin extrusion-coating, etc.
Pour un papier destiné à l'impression-écriture, on fabrique une feuille cellulosique en utilisant comme matière première principale par exemple, des combinaisons de pâtes de bois de résineux et de pâtes de bois de feuillus traitées à la soude ou au bisulfite, blanchies ou mi-blanchies.For a paper intended for printing-writing, a cellulosic sheet is made using as main raw material for example, combinations of softwood pulp and hardwood pulp treated with soda or bisulfite, bleached or semi-bleached.
Pour fabriquer un papier kraft frictionné destiné à l'emballage, on utilise comme matière première, de préférence des pâtes de bois de résineux non blanchies obtenues par le procédé au sulfate.To make a rubbed kraft paper intended for packaging, the raw material used is preferably unbleached softwood pulp obtained by the sulphate process.
Outre la cellulose, le papier peut également contenir dans sa composition d'autres types de fibres et des adjuvants papetiers, couramment utilisés et connus de l'homme de l'art.In addition to cellulose, the paper may also contain in its composition other types of fibers and papermaking adjuvants, commonly used and known to those skilled in the art.
Le procédé de marquage de papier selon l'invention est mis en oeuvre par pression de la structure souple marquée définie ci-dessus contre la feuille de papier, permettant ainsi le report des marques sur cette dernière.The paper marking process according to the invention is implemented by pressing the marked flexible structure defined above against the sheet of paper, thus allowing the marks to be transferred onto the latter.
Une application préférée de la structure souple marquée, selon l'invention, est son application à un procédé de marquage de papier kraft écru frictionné.A preferred application of the marked flexible structure according to the invention is its application to a method for marking unbleached brown kraft paper.
Selon ce procédé de marquage, les marques portées par le feutre frictionneur, vergeur ou de texture unie, se reproduisent sur la feuille de papier par pression du feutre contre la face non frictionnée de la feuille, au moment de son application contre le cylindre sécheur dit "cylindre frictionneur" dans la partie sèche de la machine à papier, par une ou plusieurs presses dites "presses frictionneuses".According to this marking process, the marks carried by the frictionneur, vergeur or plain texture felt, reproduce on the sheet of paper by pressing the felt against the non-friction side of the sheet, at the time of its application against the said drying cylinder. "friction cylinder" in the dry part of the paper machine, by one or more presses called "friction presses".
La présente invention sera mieux illustrée par les exemples non limitatifs suivants.The present invention will be better illustrated by the following nonlimiting examples.
Sur un échantillon de feutre coucheur de composition 100% fibres polyamide, on réalise par pression et fusion locales un marquage de lettres en creux.Marking of intaglio letters is carried out on a sample of coating felt of composition 100% polyamide fibers.
Sur formette de laboratoire Rapid-Köthen, on tire une feuille humide à partir d'une pâte kraft écrue de pin raffinée à 23°SR, pour un grammage final après séchage, de 70g/m² environ. Cette feuille est pressée contre le feutre marqué précédent, jusqu'à une siccité finale de 33% et séchée ensuite en contact avec le même feutre, dans le séchoir Rapid-Köthen.On a Rapid-Köthen laboratory form, a wet sheet is drawn from an unbleached pine kraft paste refined at 23 ° SR, for a final grammage after drying, of approximately 70 g / m². This sheet is pressed against the previous marked felt, to a final dryness of 33% and then dried in contact with the same felt, in the Rapid-Köthen dryer.
On obtient après séchage un report parfaitement visible des lettres portées par le feutre sur la feuille de papier, ces lettres étant lisibles par contraste net entre leur marque claire et le fond plus foncé du reste de la feuille.After drying, a perfectly visible transfer of the letters carried by the felt to the sheet of paper is obtained, these letters being legible by clear contrast between their light mark and the darker background of the rest of the sheet.
La feuille issue de la formette dans l'essai précédent est préalablement pressée par passage dans une presse à cylindres, sous une pression linéaire de 12kg/cm.The sheet resulting from the formette in the preceding test is previously pressed by passing through a cylinder press, under a linear pressure of 12 kg / cm.
La siccité atteinte est alors de 37%. On procède au séchage sur le séchoir Rapid-Köthen, en pressant légèrement la feuille au contact d'un feutre velin composé de laine et fibres polyamides, sur lequel on a effectué par pression d'un fer chauffé et fusion locale un marquage de quelques lettres "E" de 3cm x 2cm.The dryness reached is then 37%. Drying is carried out on the Rapid-Köthen dryer, lightly pressing the sheet in contact with a vellum felt composed of wool and polyamide fibers, on which a few letters have been marked by pressing a heated iron and local melting "E" of 3cm x 2cm.
On obtient après séchage un marquage parfaitement contrasté, les lettres "E" étant nettement lisibles en positif sur la face du papier opposée au feutre.After drying, a perfectly contrasted marking is obtained, the letters "E" being clearly legible in positive on the face of the paper opposite the felt.
Sur un feutre vergeur tissé à partir de 60% de fibres de laines et 40% de fibres polyamide, on procède au marquage du mot "QUALITE" en caractères de 3,5cm x 2cm, par application au pochoir d'une résine polyuréthane bicomposant toluylène-diisocyante vendue sous la dénomination "IMPRANIL C" par la Société BAYER, réticulée avec un polyisocyanate "IMPRAFIX TRL" en présence d'une amine organique à effet accélérateur et anti-adhésif "IMPRAFIX BU".On a felt marker woven from 60% wool fibers and 40% polyamide fibers, we mark the word "QUALITY" in characters of 3.5cm x 2cm, by stencil application of a two-component toluene polyurethane resin -diisocyante sold under the name "IMPRANIL C" by the company BAYER, crosslinked with a polyisocyanate "IMPRAFIX TRL" in the presence of an organic amine with accelerating and anti-adhesive effect "IMPRAFIX BU".
On obtient ainsi une marque ayant une surépaisseur moyenne d'environ 1mm.A mark is thus obtained having an average allowance of approximately 1mm.
On applique au verso du feutre à l'aide d'un racle une couche de la même résine.A layer of the same resin is applied to the back of the felt using a doctor blade.
Ce feutre est installé dans une machine à papier combinée en tant que feutre frictionneur, la face marquée étant appliquée contre la feuille de papier à son contact avec le cylindre sécheur Yankee.This felt is installed in a combined paper machine as a friction felt, the marked side being applied against the sheet of paper in contact with the Yankee drying cylinder.
On fabrique un papier kraft écru à partir d'une pâte de pin maritime, raffinée à un °SR de 25, à laquelle on a ajouté pour le collage 3kg/T de savon résinique et du sulfate d'aluminium pour un pH de 4,8 dans la suspension fibreuse en tête de machine.An unbleached kraft paper is made from a maritime pine pulp, refined at a SR of 25, to which 3 kg / t of resin soap and aluminum sulphate for a pH of 4 have been added, 8 in the fibrous suspension at the machine head.
Le feutre marqueur est pressé contre la feuille de papier ayant alors une siccité de 60%, par une presse frictionneuse sous une pression linéaire de 100kg/cm.The marker felt is pressed against the sheet of paper then having a dryness of 60%, by a friction press under a linear pressure of 100 kg / cm.
A sa sortie du cylindre Yankee, la feuille a une teneur en eau résiduelle de 7,2% et un grammage moyen de 50g/m².On leaving the Yankee cylinder, the sheet has a residual water content of 7.2% and an average grammage of 50 g / m².
Elle présente de manière très contrastée la marque "QUALITE" apparaissant en négatif sur la face non frictionnée et lisible en positif, en velin sur le fond vergé, sur la face lisse du papier.It presents in a very contrasting way the mark "QUALITY" appearing in negative on the non-rubbed face and readable in positive, in vellum on the laid back, on the smooth face of the paper.
Claims (18)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8905365 | 1989-04-21 | ||
| FR8905365A FR2646181B1 (en) | 1989-04-21 | 1989-04-21 | METHOD FOR MARKING A FLEXIBLE STRUCTURE, SO FLEXIBLE STRUCTURE THUS OBTAINED AND ITS USE IN A METHOD FOR MARKING A CELLULOSIC SHEET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0394134A1 true EP0394134A1 (en) | 1990-10-24 |
Family
ID=9381021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90401066A Withdrawn EP0394134A1 (en) | 1989-04-21 | 1990-04-19 | Process for marking a flexible structure, flexible structure obtained and its use in a process for marking a cellulose web |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0394134A1 (en) |
| FI (1) | FI901978A0 (en) |
| FR (1) | FR2646181B1 (en) |
| NO (1) | NO901724L (en) |
| PT (1) | PT93826A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998019008A1 (en) * | 1996-10-26 | 1998-05-07 | Scapa Group Plc | Papermakers impression fabric |
| WO1998027277A1 (en) * | 1996-12-17 | 1998-06-25 | Scapa Group Plc | Papermakers felts |
| WO1998033975A1 (en) * | 1997-02-04 | 1998-08-06 | Aussedat-Rey | Method for preparing marked paper and device for implementing said method |
| NL1006151C2 (en) * | 1997-05-29 | 1998-12-01 | Rudico Holding B V | Forming wire for making paper with watermark |
| WO2000075423A1 (en) * | 1999-06-07 | 2000-12-14 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using extrusion |
| US6251331B1 (en) | 1998-09-09 | 2001-06-26 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using fluid pressure differential |
| US6358594B1 (en) | 1999-06-07 | 2002-03-19 | The Procter & Gamble Company | Papermaking belt |
| US6561781B1 (en) | 1998-08-14 | 2003-05-13 | Robert Stanley Ampulski | Papermaking belt and apparatus for making same |
| US7141142B2 (en) * | 2003-09-26 | 2006-11-28 | Kimberly-Clark Worldwide, Inc. | Method of making paper using reformable fabrics |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE623516C (en) * | 1900-01-01 | |||
| FR496317A (en) * | 1918-09-16 | 1919-11-04 | Cartonneries De Gondardennes D | Improvements in cardboard manufacturing |
| DE1461082A1 (en) * | 1964-05-22 | 1968-11-28 | Dexter Corp | Pulp and method and device for its production |
| US4111634A (en) * | 1976-09-16 | 1978-09-05 | H. Waterbury & Sons Company | Apparatus for producing papermaker's felt |
| EP0109307A2 (en) * | 1982-11-16 | 1984-05-23 | Scott Paper Company | Papermaking machine |
| EP0140404A1 (en) * | 1983-08-23 | 1985-05-08 | The Procter & Gamble Company | Tissue paper and process of manufacture thereof |
| WO1986005220A1 (en) * | 1985-03-06 | 1986-09-12 | Usg Corporation | Method for producing patterns on a fiber felting screen |
| EP0211426A2 (en) * | 1985-08-05 | 1987-02-25 | Hermann Wangner GmbH & Co. KG | Multi-layer fabric for paper making machines having an improved stability and permeability |
-
1989
- 1989-04-21 FR FR8905365A patent/FR2646181B1/en not_active Expired - Fee Related
-
1990
- 1990-04-19 EP EP90401066A patent/EP0394134A1/en not_active Withdrawn
- 1990-04-19 NO NO90901724A patent/NO901724L/en unknown
- 1990-04-20 FI FI901978A patent/FI901978A0/en not_active IP Right Cessation
- 1990-04-20 PT PT93826A patent/PT93826A/en not_active Application Discontinuation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE623516C (en) * | 1900-01-01 | |||
| FR496317A (en) * | 1918-09-16 | 1919-11-04 | Cartonneries De Gondardennes D | Improvements in cardboard manufacturing |
| DE1461082A1 (en) * | 1964-05-22 | 1968-11-28 | Dexter Corp | Pulp and method and device for its production |
| US4111634A (en) * | 1976-09-16 | 1978-09-05 | H. Waterbury & Sons Company | Apparatus for producing papermaker's felt |
| EP0109307A2 (en) * | 1982-11-16 | 1984-05-23 | Scott Paper Company | Papermaking machine |
| EP0140404A1 (en) * | 1983-08-23 | 1985-05-08 | The Procter & Gamble Company | Tissue paper and process of manufacture thereof |
| WO1986005220A1 (en) * | 1985-03-06 | 1986-09-12 | Usg Corporation | Method for producing patterns on a fiber felting screen |
| EP0211426A2 (en) * | 1985-08-05 | 1987-02-25 | Hermann Wangner GmbH & Co. KG | Multi-layer fabric for paper making machines having an improved stability and permeability |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998019008A1 (en) * | 1996-10-26 | 1998-05-07 | Scapa Group Plc | Papermakers impression fabric |
| WO1998027277A1 (en) * | 1996-12-17 | 1998-06-25 | Scapa Group Plc | Papermakers felts |
| GB2334536A (en) * | 1996-12-17 | 1999-08-25 | Scapa Group Plc | Papermakers felts |
| WO1998033975A1 (en) * | 1997-02-04 | 1998-08-06 | Aussedat-Rey | Method for preparing marked paper and device for implementing said method |
| NL1006151C2 (en) * | 1997-05-29 | 1998-12-01 | Rudico Holding B V | Forming wire for making paper with watermark |
| US6561781B1 (en) | 1998-08-14 | 2003-05-13 | Robert Stanley Ampulski | Papermaking belt and apparatus for making same |
| US6251331B1 (en) | 1998-09-09 | 2001-06-26 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using fluid pressure differential |
| US6554601B2 (en) | 1998-09-09 | 2003-04-29 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using fluid pressure differential |
| US6344241B1 (en) | 1999-06-07 | 2002-02-05 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using extrusion |
| US6358594B1 (en) | 1999-06-07 | 2002-03-19 | The Procter & Gamble Company | Papermaking belt |
| WO2000075423A1 (en) * | 1999-06-07 | 2000-12-14 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using extrusion |
| US6733833B2 (en) | 1999-06-07 | 2004-05-11 | The Procter & Gamble Company | Process and apparatus for making papermaking belt using extrusion |
| US7141142B2 (en) * | 2003-09-26 | 2006-11-28 | Kimberly-Clark Worldwide, Inc. | Method of making paper using reformable fabrics |
Also Published As
| Publication number | Publication date |
|---|---|
| PT93826A (en) | 1991-11-29 |
| NO901724L (en) | 1990-10-22 |
| FR2646181B1 (en) | 1991-07-26 |
| FI901978A0 (en) | 1990-04-20 |
| FR2646181A1 (en) | 1990-10-26 |
| NO901724D0 (en) | 1990-04-19 |
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