US20070051687A1 - Reclosable metal bottle - Google Patents
Reclosable metal bottle Download PDFInfo
- Publication number
- US20070051687A1 US20070051687A1 US11/468,911 US46891106A US2007051687A1 US 20070051687 A1 US20070051687 A1 US 20070051687A1 US 46891106 A US46891106 A US 46891106A US 2007051687 A1 US2007051687 A1 US 2007051687A1
- Authority
- US
- United States
- Prior art keywords
- collar
- neck
- threads
- metal bottle
- reclosable
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/023—Neck construction
- B65D1/0246—Closure retaining means, e.g. beads, screw-threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/40—Details of walls
- B65D1/42—Reinforcing or strengthening parts or members
- B65D1/48—Reinforcements of dissimilar materials, e.g. metal frames in plastic walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/04—Threaded or like caps or cap-like covers secured by rotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
- B65D41/16—Snap-on caps or cap-like covers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3008—Preforms or parisons made of several components at neck portion
Definitions
- the present invention pertains generally to containers and more specifically to metal containers.
- Plastic containers for containing beverages have been in existence for some time.
- One of the goals of the container industry has been to fabricate a reclosable metal bottle that is capable of withstanding the pressures that can be created by carbonated fluids in the metal bottle that can exceed 100 pounds per square inch.
- Attempts have been made to provide reclosable metal bottles that use threaded plastic outserts that are mounted on the metal bottle neck.
- the plastic outserts can provide sufficient rigidity and strength to operate under the high pressures that can be created in the metal bottle from carbonated fluids.
- An example of the use of a plastic outsert is disclosed in U.S. Pat. No. 6,010,026 issued Jan. 4, 2002 to Hans H. Dickhoff and assigned to Aluminum Company of America.
- plastic outserts One of the problems associated with the use of plastic outserts is that contaminants from the plastic can be introduced during the burn off period when the metal bottles are melted for recycling purposes.
- the plastic outserts can be expensive which raises the overall price of the container.
- impact extruding processes that are typically used to form metal containers can be expensive when forming a metal bottle because of the large number of necking stages that are required to neck the container into a bottle shape. As such, the overall cost of making a metal bottle is high and requires a large capital investment.
- the present invention may therefore comprise a method of making a reclosable metal bottle comprising: necking a body portion of the reclosable metal bottle to form a neck portion that includes an extended neck portion; trimming the extended neck portion from the neck portion to form a collar; working the collar to form threads and increase the diameter of the collar; backfilling indentations formed by the threads in the collar with a backfiller material; placing the collar over the neck; securing the collar to the neck.
- the present invention may further comprise a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a collar trimmed from the neck portion and secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
- a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a collar trimmed from the neck portion and secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
- the present invention may further comprise a method of making a reclosable metal bottle comprising: necking a body portion of the reclosable metal bottle to form a neck portion; providing a metal collar; working the collar to form threads and increase the diameter of the collar; backfilling indentations formed by the threads in the collar with a backfiller material; placing the collar over the neck; securing the collar to the neck.
- the present invention may further comprise a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a metal collar that is secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
- a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a metal collar that is secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
- FIG. 1 is one embodiment of an isometric view of a reclosable metal bottle.
- FIG. 2 is a side view of a necked bottle.
- FIG. 3 is a side view of the necked bottle of FIG. 2 with a trimmed collar.
- FIG. 4 is a side view of the metal bottle of FIG. 3 and a trimmed collar with the trimmed collar formed with threads.
- FIG. 5 is a side view of the metal bottle of FIG. 4 with the trimmed collar mounted on the neck of the trimmed bottle.
- FIG. 6 is a cut-away view of the embodiment of FIG. 5 .
- FIG. 7 is a cut-away, close-up view of the neck portion of the embodiment of FIG. 5 .
- FIG. 8 is a side view of another embodiment of a metal bottle and a trimmed collar that has been formed with lugs.
- FIG. 9 is a side view of the metal bottle of FIG. 8 with the collar mounted on the metal bottle.
- FIG. 10 is a cut-away view of the embodiment of FIG. 9 .
- FIG. 11 is a side view of another embodiment of a metal bottle with the collar formed with pressure released lugs.
- FIG. 12 is a side view of the metal bottle of FIG. 11 with the collar portion mounted on the bottle.
- FIG. 13 is a cut-away view of the embodiment of FIG. 12 .
- FIG. 14 is a cut-away view of the neck portion of the embodiment of FIG. 13 .
- FIG. 1 is an isometric view of one embodiment of a metal bottle that is made in accordance with the present invention.
- the reclosable metal bottle 100 has a body portion 102 and a neck portion 104 .
- Mounted on the neck portion is a collar 106 that has threads 108 .
- the top of the neck portion 110 is curled and can be crimped to hold the collar 106 in place on the neck portion 104 and retain the collar 106 so that the collar 106 is held on the neck portion 104 and cannot be removed from the end of the neck portion 104 .
- Cap 112 is a standard metal cap with threads that engage threads 108 of the collar 106 .
- the inside top of the cap 112 seals against the smooth curl 110 at the top of neck portion 104 .
- the process of forming a typical can body results in the mid portion of the body 102 , i.e., the mid-body of a typical aluminum beverage can, to have a thickness of around 4 thousandths of an inch.
- the mid-body may be slightly less thick, i.e., on the order of 3.8 or 3.6 thousandths of an inch, for aluminum cans.
- the thickness at the mid-body can be as low as 2.6 or 2.7 thousandths of an inch.
- the neck 104 has a thickness that is 2.0 to 2.5 thousandths of an inch greater than the body portion using ironing processes.
- the neck portion in a standard aluminum can have thicknesses in the range of 6.0 to 6.5 thousandths of an inch.
- a typical thickness in the neck portion of around 6.0 thousandsths of an inch would normally be considered to have insufficient strength for threads that are capable of withstanding the pressures of over 100 pounds per square inch that may be created by a carbonated liquid in an enclosed container.
- additional strength/thickness is required in the neck portion 104 to form threads for a reclosable metal bottle.
- FIG. 2 is a side view of the body portion 102 which can be made using an impact extrusion process, or can be formed using a drawn and ironing process.
- the neck 104 including the extended portion 114 can be made using the above processes or more preferably using a linear drive metal forming machine as described in Publication Number US 2005-0155404A1 which is specifically incorporated herein for all that it discloses and teaches.
- FIG. 3 is a side view of the metal bottle illustrated in FIG. 2 with the extended portion 114 removed from the neck 104 to form a collar 106 .
- the collar 106 can be severed or cut in any desired fashion from the neck 104 to form a separate collar 106 .
- the trimming of the collar 106 from the neck 104 can constitute a standard trimming process that would otherwise occur in the trimming of the neck 104 .
- the top of the collar 106 can be trimmed first in the standard manner in which the neck 104 of a container would otherwise be trimmed to form an even and flat surface.
- the extended portion 114 that forms the collar 106 can be trimmed from the neck 104 , in the same fashion, to form a flat and even surface at the top of the neck 104 and the bottom of the collar 106 .
- the number of steps in forming the collar 106 is minimized, and there is a minimal amount of waste associated with the process of forming the reclosable metal bottle 100 and the collar 106 .
- the collar 106 of FIG. 3 can also be constructed separately from the reclosable metal bottle 100 .
- the reclosable metal bottle 100 can be formed with a neck 104 such as shown in FIG. 3 and a separate collar 106 can be formed separately using other material. This reduces the amount of forming that is required of the metal material in the neck 104 .
- the collar 106 can be sized so that it fits over the neck 104 when the collar 106 is first formed.
- FIG. 4 is a side view of the reclosable metal bottle 100 and collar 106 .
- the metal in collar 106 has been worked to form threads 108 in the collar 106 .
- the inner diameter of the collar 106 can also be increased so that the collar 106 can slide over the neck 104 and fit tightly on the neck 104 .
- Conventional stamping techniques and other metal forming processes can be used to form the threads 108 in the collar 106 and expand the inner diameter of the collar so that it slides over the neck 104 .
- a standard stamping process can be used for this purpose.
- the working of the metal in the collar 106 provides more rigidity to the metal, which further assists in creating threads 108 that will not fail under the pressures that can be created above 100 pounds per square inch within the reclosable metal bottle 100 . Since the collar 106 is separated from the reclosable metal bottle during the trimming process, there is easy access to the inner surface of the collar 106 to form the threads 108 .
- the neck portion 104 may have a thickness of around 9 thousandths of an inch, resulting in a mid-body portion of the reclosable metal bottle 100 having a thickness of 6.5 to 7 thousandths of an inch which is not substantially greater than the mid-body thickness of a standard aluminum beverage can.
- Using thicknesses in these ranges results in the fabrication of economical metal bottles, made from aluminum, that do not have substantially more metal, and subsequently do not have substantially more cost, than standard lightweight metal beverage cans. Since the process of trimming the neck 104 must be performed in any event, to provide a smooth and even neck 104 , no additional steps are required to form the collar 106 .
- a combined thickness of 18 thousandths of an inch provides sufficient strength to create threads that allow a threaded cap to seal and hold the high pressures that can be created by a carbonated beverage that may exceed 100 pounds per square inch.
- total thicknesses in the range of 18 thousandths of an inch are created that are capable of providing the structural rigidity that is necessary for a reclosable threaded structure to withstand pressures in a carbonated beverage container.
- bonding agents can be used to add further strength and thickness to the structure of the combined collar 106 and neck 104 to further reduce metal thickness, as explained below.
- FIG. 5 is a side view of the reclosable metal bottle 100 with the collar 106 mounted on the neck 104 .
- the top edge of the neck 104 is curled (rolled over) along the top edge of the neck 104 to hold the collar 106 in place on neck 104 .
- the top surface of the curl 110 forms a smooth, flat surface on which a seal can be formed with a closure or cap.
- Threads 108 on the collar 106 extend outwardly and provide a threaded surface on which to screw a cap or other closure device.
- the collar 106 can be affixed to the neck 104 by strictly mechanical means such as by crimping. Alternatively, an adhesive or other bonding agent can be used to secure the collar 106 to the neck 104 .
- a filler material can be used, which may or may not comprise a bonding agent, that fills the inside surfaces of the threads 108 so as to provide additional rigidity to the structure that forms the threaded surface.
- a bonding agent such as an adhesive
- Bonding agents such as epoxy can be used as both a filler and as an adhesive.
- the curl 110 can be used in conjunction with the adhesive to ensure that the collar 106 is mechanically secured on the neck 104 and cannot be easily pulled off of the end of the neck 104 .
- the thickness of the metal in the neck 104 and collar 106 may be reduced even further.
- FIG. 6 is a cut-away view of FIG. 5 .
- the body portion 102 is shown as well as the neck 104 and collar 106 .
- the collar 106 slides over the neck 104 with very close tolerances to form a gap 116 .
- Boding agents and fillers can be inserted in the gap 116 to strengthen the double-walled structure, as disclosed above.
- FIG. 7 is a cut-away view of the neck portion and the collar of the embodiment of FIG. 6 .
- the top of the neck 104 is rolled over to form a curl 110 .
- the curl 110 holds the collar 106 in place on the neck 104 .
- the curl 110 forms a flat top portion 118 that is capable of creating a seal with the threaded closure.
- FIG. 7 also illustrates the filler 122 that can be used to backfill the threads 108 , which adds additional rigidity and strength to the threads 108 .
- the use of a filler may reduce the overall thicknesses required in the neck and collar to about 7 thousandths of inch for aluminum. As indicated above, this would allow the construction of lightweight reclosable bottles, such as the lightweight cans, that are currently in use.
- the filler 122 can comprise any desired filler type of material. As indicated above, the filler may comprise a bonding agent such as an adhesive. Other types of fillers can also be used.
- the collar 106 can be sent through a stamping or other forming operation which would properly size the collar 106 to fit around the neck 104 and to also create the threads 108 .
- the collar 106 is then sent to a coating operation, or lining operation, to apply the filler to the stamped-in features so as to backfill the threads 108 .
- This lining or coating that is applied as a filler may differ from any adhesive that may be applied when securing the collar 106 to the neck 104 .
- the collar 106 may simply be mechanically secured to the neck 104 by way of a crimp created by curl 110 .
- an FDA coating is applied to the interior portion of the bottle.
- the FDA coating is required in beverage containers to prevent the beverage from contacting the metal and thereby contaminating the beverage.
- the FDA coating provides a certain amount of lubrication during the necking process.
- the metal and the FDA coating in the neck 104 are extensively worked.
- One of the advantages of the process and structure disclosed herein is that the portions of the neck 104 , i.e., the extended portion 114 , that is worked the hardest, is removed from the bottle.
- the existence of the FDA coating on the extended portion 114 is irrelevant since the extended portion 114 constitutes the collar 106 which is placed over the outside of the neck 104 . Hence, the hardest worked portions of the neck 104 are removed and used as the collar 106 . As such, the interior portion neck 104 does not require washing and recoating, which is an expensive process.
- Another advantage of using the collar 106 which is applied to the outside of the neck 104 is that, if threads were directly stamped into the neck 104 , a recoating process may be required to recoat the inside of the neck with an FDA coating, which again, is an expensive process. Of course, these processes are avoided since the neck 104 is not stamped or otherwise reworked after the necking process.
- One of the other desirable features is that once the collar 106 is removed from the can, it can be reworked and processed as desired. For example, once the threads are formed, the outside surface of the collar 106 can be powder coated to form a very desirable surface from which to drink.
- FIG. 8 is a side view of another embodiment of a reclosable metal bottle 124 .
- a collar 126 is also trimmed from the reclosable metal bottle 124 in the manner described above.
- lugs 128 are formed in the collar 126 using any one of the processes described above.
- the lugs 128 have a profile that matches the closure or cap (not shown) so that the closure can be easily applied and engage the lugs 128 .
- the cap can then be sealed on the bottle 124 with a quarter turn.
- the advantage of lugs over threads is that lugs allow the cap to be opened with a simple quarter turn that eliminates the multiple rotations that are normally required to seal a threaded closure.
- threaded closures are more prone to cross-threading than lugs, which further adds to the reliability of being able to form a proper seal using a lug closure device.
- FIG. 9 is a side view of the reclosable metal bottle 124 with the collar 126 mounted on the neck 132 .
- the curl 130 can be formed in the upper portion of the neck 132 which crimps the collar 126 mechanically onto the neck 132 .
- the curl 130 creates a crimp above the location of the lugs 128 so that the curl 130 does not interfere with the lugs 128 .
- FIG. 10 is a cut-away view of the reclosable metal bottle 124 , illustrating the lugs 128 and the neck 132 .
- FIG. 11 illustrates another embodiment of a reclosable metal bottle 134 .
- a collar 136 is trimmed from the neck 140 in the manner disclosed above.
- the collar 136 can then be processed, as disclosed above, to form pressure release lugs 138 .
- the pressure release lugs 138 as well as the collar, can be processed and formed using any of the desired processes disclosed above, including the backfilling and coating of the pressure release lugs 138 .
- FIG. 12 is a side view of the reclosable metal bottle 134 .
- the collar 136 is mounted on the neck 140 . Again, any of the processes for mounting of the collar 136 on the neck 140 , such as disclosed above, can be used.
- the pressure release lugs 138 are adapted to engage a closure device such as a cap that is designed to engage the pressure release lugs 138 and form a seal with the curl 142 .
- the pressure release lugs 138 operate such that a small turn of the cap allows the seal between the cap and the curl 142 to open slightly and release pressure around the side of the cap and between the pressure release lugs 138 , while still maintaining the cap engaged with the pressure release lugs 138 so that the cap will not be ejected from the top of the reclosable metal bottle 134 . The cap can then be turned farther to release the cap from the pressure release lugs 138 .
- the pressure release lugs 138 provide a safe and convenient type of closure.
- FIG. 13 is a cut-away view of the reclosable metal bottle 134 of FIG. 12 .
- the pressure release lugs 138 are disposed around the periphery of the collar 136 for engagement with a closure device (a pressure release lug cap).
- FIG. 14 is a cut-away view of the embodiment of FIGS. 12 and 13 .
- the collar 136 is fit around the neck 140 and secured in position by the curl 142 .
- Curl 142 can also overlap the collar 136 and crimp the collar 136 in a secure position on the neck 140 .
- notches can also be made in the edge of the curl 142 and the top of the collar 136 to prevent rotation of the collar 136 on the neck 140 .
- the pressure release lugs 138 are formed in the collar 136 and protrude outwardly for engagement with a closure device such as a cap. Again, all the different methods of mounting including gluing and bonding the collar 136 to the neck 140 can be used, as well as backfilling the pressure release lugs 138 , to provide additional strength and rigidity to the pressure release lugs 138 .
- the various embodiments therefore provide a unique reclosable metal bottle in which a trimmed portion of the neck can be reused and mounted on the neck to provide the structural rigidity necessary to form threads or lugs for recloseability, and result in a substantial savings in the overall cost of the reclosable metal bottle.
- Thin wall metal bottles having thicknesses on the order of thin wall metal cans currently in use, can be made using this process with minimal material waste since the trimmed neck portion is being reused as a threaded collar.
- Structural rigidity and strength can be added by using fillers to backfill the indentations of the threads in the collar. Threads or lugs can be used, including pressure release lugs, that add both safety and convenience. Since the reclosable metal bottle is an all-metal container, the bottle can be recycled without introducing contaminants. Backfill and bonding agents can be chosen that do not introduce contaminants in the melting recycling process.
Abstract
Description
- This application claims benefit of and priority to U.S. Provisional Patent Application Ser. No. 60/715,052 entitled “Reclosable Metal Bottle” by Christopher J. Olson, filed Sep. 7, 2005, the entire contents of which are specifically incorporated herein by reference for all that it discloses and teaches.
- a. Field of the Invention
- The present invention pertains generally to containers and more specifically to metal containers.
- b. Description of the Background
- Metal containers for containing beverages have been in existence for some time. One of the goals of the container industry has been to fabricate a reclosable metal bottle that is capable of withstanding the pressures that can be created by carbonated fluids in the metal bottle that can exceed 100 pounds per square inch. Attempts have been made to provide reclosable metal bottles that use threaded plastic outserts that are mounted on the metal bottle neck. The plastic outserts can provide sufficient rigidity and strength to operate under the high pressures that can be created in the metal bottle from carbonated fluids. An example of the use of a plastic outsert is disclosed in U.S. Pat. No. 6,010,026 issued Jan. 4, 2002 to Hans H. Dickhoff and assigned to Aluminum Company of America.
- One of the problems associated with the use of plastic outserts is that contaminants from the plastic can be introduced during the burn off period when the metal bottles are melted for recycling purposes. In addition, the plastic outserts can be expensive which raises the overall price of the container. Also, impact extruding processes that are typically used to form metal containers can be expensive when forming a metal bottle because of the large number of necking stages that are required to neck the container into a bottle shape. As such, the overall cost of making a metal bottle is high and requires a large capital investment.
- The present invention may therefore comprise a method of making a reclosable metal bottle comprising: necking a body portion of the reclosable metal bottle to form a neck portion that includes an extended neck portion; trimming the extended neck portion from the neck portion to form a collar; working the collar to form threads and increase the diameter of the collar; backfilling indentations formed by the threads in the collar with a backfiller material; placing the collar over the neck; securing the collar to the neck.
- The present invention may further comprise a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a collar trimmed from the neck portion and secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
- The present invention may further comprise a method of making a reclosable metal bottle comprising: necking a body portion of the reclosable metal bottle to form a neck portion; providing a metal collar; working the collar to form threads and increase the diameter of the collar; backfilling indentations formed by the threads in the collar with a backfiller material; placing the collar over the neck; securing the collar to the neck.
- The present invention may further comprise a reclosable metal bottle comprising: a thin wall metal body portion; a neck portion that has been formed from the thin wall metal body portion; a metal collar that is secured to an outside surface of the neck portion; threads formed in the collar; filler material that is backfilled into openings formed by the threads on the inside surface of the collar, the filler material providing strength and rigidity to the threads.
-
FIG. 1 is one embodiment of an isometric view of a reclosable metal bottle. -
FIG. 2 is a side view of a necked bottle. -
FIG. 3 is a side view of the necked bottle ofFIG. 2 with a trimmed collar. -
FIG. 4 is a side view of the metal bottle ofFIG. 3 and a trimmed collar with the trimmed collar formed with threads. -
FIG. 5 is a side view of the metal bottle ofFIG. 4 with the trimmed collar mounted on the neck of the trimmed bottle. -
FIG. 6 is a cut-away view of the embodiment ofFIG. 5 . -
FIG. 7 is a cut-away, close-up view of the neck portion of the embodiment ofFIG. 5 . -
FIG. 8 is a side view of another embodiment of a metal bottle and a trimmed collar that has been formed with lugs. -
FIG. 9 is a side view of the metal bottle ofFIG. 8 with the collar mounted on the metal bottle. -
FIG. 10 is a cut-away view of the embodiment ofFIG. 9 . -
FIG. 11 is a side view of another embodiment of a metal bottle with the collar formed with pressure released lugs. -
FIG. 12 is a side view of the metal bottle ofFIG. 11 with the collar portion mounted on the bottle. -
FIG. 13 is a cut-away view of the embodiment ofFIG. 12 . -
FIG. 14 is a cut-away view of the neck portion of the embodiment ofFIG. 13 . -
FIG. 1 is an isometric view of one embodiment of a metal bottle that is made in accordance with the present invention. As shown inFIG. 1 , thereclosable metal bottle 100 has abody portion 102 and aneck portion 104. Mounted on the neck portion is acollar 106 that hasthreads 108. The top of theneck portion 110 is curled and can be crimped to hold thecollar 106 in place on theneck portion 104 and retain thecollar 106 so that thecollar 106 is held on theneck portion 104 and cannot be removed from the end of theneck portion 104. Cap 112 is a standard metal cap with threads that engagethreads 108 of thecollar 106. The inside top of thecap 112 seals against thesmooth curl 110 at the top ofneck portion 104. - The process of forming a typical can body results in the mid portion of the
body 102, i.e., the mid-body of a typical aluminum beverage can, to have a thickness of around 4 thousandths of an inch. In some applications, the mid-body may be slightly less thick, i.e., on the order of 3.8 or 3.6 thousandths of an inch, for aluminum cans. For steel cans, the thickness at the mid-body can be as low as 2.6 or 2.7 thousandths of an inch. Typically, theneck 104 has a thickness that is 2.0 to 2.5 thousandths of an inch greater than the body portion using ironing processes. Hence, the neck portion in a standard aluminum can have thicknesses in the range of 6.0 to 6.5 thousandths of an inch. At least for aluminum containers, a typical thickness in the neck portion of around 6.0 thousandsths of an inch would normally be considered to have insufficient strength for threads that are capable of withstanding the pressures of over 100 pounds per square inch that may be created by a carbonated liquid in an enclosed container. Hence, additional strength/thickness is required in theneck portion 104 to form threads for a reclosable metal bottle. -
FIG. 2 is a side view of thebody portion 102 which can be made using an impact extrusion process, or can be formed using a drawn and ironing process. Theneck 104 including the extended portion 114 can be made using the above processes or more preferably using a linear drive metal forming machine as described in Publication Number US 2005-0155404A1 which is specifically incorporated herein for all that it discloses and teaches. -
FIG. 3 is a side view of the metal bottle illustrated inFIG. 2 with the extended portion 114 removed from theneck 104 to form acollar 106. Thecollar 106 can be severed or cut in any desired fashion from theneck 104 to form aseparate collar 106. The trimming of thecollar 106 from theneck 104, as shown inFIG. 3 , can constitute a standard trimming process that would otherwise occur in the trimming of theneck 104. In other words, the top of thecollar 106 can be trimmed first in the standard manner in which theneck 104 of a container would otherwise be trimmed to form an even and flat surface. Then, the extended portion 114 that forms thecollar 106 can be trimmed from theneck 104, in the same fashion, to form a flat and even surface at the top of theneck 104 and the bottom of thecollar 106. Using this process, the number of steps in forming thecollar 106 is minimized, and there is a minimal amount of waste associated with the process of forming thereclosable metal bottle 100 and thecollar 106. - The
collar 106 ofFIG. 3 can also be constructed separately from thereclosable metal bottle 100. In other words, thereclosable metal bottle 100 can be formed with aneck 104 such as shown inFIG. 3 and aseparate collar 106 can be formed separately using other material. This reduces the amount of forming that is required of the metal material in theneck 104. Thecollar 106 can be sized so that it fits over theneck 104 when thecollar 106 is first formed. -
FIG. 4 is a side view of thereclosable metal bottle 100 andcollar 106. As shown inFIG. 4 , the metal incollar 106 has been worked to formthreads 108 in thecollar 106. In the process of working the metal in thecollar 106 to formthreads 108, the inner diameter of thecollar 106 can also be increased so that thecollar 106 can slide over theneck 104 and fit tightly on theneck 104. Conventional stamping techniques and other metal forming processes can be used to form thethreads 108 in thecollar 106 and expand the inner diameter of the collar so that it slides over theneck 104. For example, a standard stamping process can be used for this purpose. The working of the metal in thecollar 106 provides more rigidity to the metal, which further assists in creatingthreads 108 that will not fail under the pressures that can be created above 100 pounds per square inch within thereclosable metal bottle 100. Since thecollar 106 is separated from the reclosable metal bottle during the trimming process, there is easy access to the inner surface of thecollar 106 to form thethreads 108. - The
neck portion 104, including thecollar 106, may have a thickness of around 9 thousandths of an inch, resulting in a mid-body portion of thereclosable metal bottle 100 having a thickness of 6.5 to 7 thousandths of an inch which is not substantially greater than the mid-body thickness of a standard aluminum beverage can. Using thicknesses in these ranges results in the fabrication of economical metal bottles, made from aluminum, that do not have substantially more metal, and subsequently do not have substantially more cost, than standard lightweight metal beverage cans. Since the process of trimming theneck 104 must be performed in any event, to provide a smooth and evenneck 104, no additional steps are required to form thecollar 106. A combined thickness of 18 thousandths of an inch provides sufficient strength to create threads that allow a threaded cap to seal and hold the high pressures that can be created by a carbonated beverage that may exceed 100 pounds per square inch. By using the thickness of the metal in thecollar 106 together with the thickness of the metal in theneck 104, total thicknesses in the range of 18 thousandths of an inch are created that are capable of providing the structural rigidity that is necessary for a reclosable threaded structure to withstand pressures in a carbonated beverage container. In addition, and/or alternatively, bonding agents can be used to add further strength and thickness to the structure of the combinedcollar 106 andneck 104 to further reduce metal thickness, as explained below. -
FIG. 5 is a side view of thereclosable metal bottle 100 with thecollar 106 mounted on theneck 104. The top edge of theneck 104 is curled (rolled over) along the top edge of theneck 104 to hold thecollar 106 in place onneck 104. The top surface of thecurl 110 forms a smooth, flat surface on which a seal can be formed with a closure or cap.Threads 108 on thecollar 106 extend outwardly and provide a threaded surface on which to screw a cap or other closure device. Thecollar 106 can be affixed to theneck 104 by strictly mechanical means such as by crimping. Alternatively, an adhesive or other bonding agent can be used to secure thecollar 106 to theneck 104. A filler material can be used, which may or may not comprise a bonding agent, that fills the inside surfaces of thethreads 108 so as to provide additional rigidity to the structure that forms the threaded surface. In other words, a bonding agent (such as an adhesive), of any desired type, can be used together with a separate filler that fills the inside surfaces of the thread, or the bonding agent itself can function as a filler and an adhesive bonding agent. Bonding agents such as epoxy can be used as both a filler and as an adhesive. Thecurl 110 can be used in conjunction with the adhesive to ensure that thecollar 106 is mechanically secured on theneck 104 and cannot be easily pulled off of the end of theneck 104. If a filler/adhesive is being used in conjunction with thecollar 106, the thickness of the metal in theneck 104 andcollar 106 may be reduced even further. As disclosed above, without the use of a filler, it may be desirable to have a wall thickness in the neck of approximately 9 thousandths, so that a total of 18 thousandths of an inch is achieved when thecollar 106 is placed over theneck 108. However, when a filler and/or adhesive is used that backfills the thread indentations on the collar, it is possible that wall thicknesses as low as 7 thousandths of an inch in theneck 104 andcollar 106 can be used that will provide sufficient rigidity and strength so that the threads will not compress as a result of pressure from the interior portion of thereclosable metal bottle 100. As a result, mid-body thicknesses of 4.5 to 5 thousandths of an inch can be achieved which is equivalent to the mid-body thicknesses of typical lightweight aluminum beverage cans. Hence, considerable cost savings in the materials can be obtained, resulting in a significant savings in the overall cost of the reclosable metal bottle. Of course, other types of metals can be used, such as steel, which would result in different thicknesses, but would provide similar savings. -
FIG. 6 is a cut-away view ofFIG. 5 . As shown inFIG. 6 , thebody portion 102 is shown as well as theneck 104 andcollar 106. As shown inFIG. 6 , thecollar 106 slides over theneck 104 with very close tolerances to form agap 116. Boding agents and fillers can be inserted in thegap 116 to strengthen the double-walled structure, as disclosed above. -
FIG. 7 is a cut-away view of the neck portion and the collar of the embodiment ofFIG. 6 . As shown inFIG. 7 , the top of theneck 104 is rolled over to form acurl 110. Thecurl 110 holds thecollar 106 in place on theneck 104. As disclosed above, thecurl 110 forms a flattop portion 118 that is capable of creating a seal with the threaded closure. -
FIG. 7 also illustrates thefiller 122 that can be used to backfill thethreads 108, which adds additional rigidity and strength to thethreads 108. As indicated above, the use of a filler may reduce the overall thicknesses required in the neck and collar to about 7 thousandths of inch for aluminum. As indicated above, this would allow the construction of lightweight reclosable bottles, such as the lightweight cans, that are currently in use. As indicated above, thefiller 122 can comprise any desired filler type of material. As indicated above, the filler may comprise a bonding agent such as an adhesive. Other types of fillers can also be used. Once thecollar 106 is severed from theneck portion 104, as illustrated inFIGS. 3 and 4 , thecollar 106 can be sent through a stamping or other forming operation which would properly size thecollar 106 to fit around theneck 104 and to also create thethreads 108. Thecollar 106 is then sent to a coating operation, or lining operation, to apply the filler to the stamped-in features so as to backfill thethreads 108. This lining or coating that is applied as a filler may differ from any adhesive that may be applied when securing thecollar 106 to theneck 104. Once the filler is applied, thecollar 106 may simply be mechanically secured to theneck 104 by way of a crimp created bycurl 110. Slotting and other ways of mechanically securing thecollar 106 to theneck 104 can be used to prevent rotation of thecollar 106 on theneck 104. Since thereclosable metal bottle 100 is sealed by way of the flat top of thecurl 118 with the cap, thecollar 106 does not have to be hermetically sealed to theneck 104. - Prior to the process of necking to form the extended neck portion 114 of
neck 104, an FDA coating is applied to the interior portion of the bottle. The FDA coating is required in beverage containers to prevent the beverage from contacting the metal and thereby contaminating the beverage. In addition, the FDA coating provides a certain amount of lubrication during the necking process. To form the extended neck portion 114, the metal and the FDA coating in theneck 104 are extensively worked. One of the advantages of the process and structure disclosed herein is that the portions of theneck 104, i.e., the extended portion 114, that is worked the hardest, is removed from the bottle. The existence of the FDA coating on the extended portion 114 is irrelevant since the extended portion 114 constitutes thecollar 106 which is placed over the outside of theneck 104. Hence, the hardest worked portions of theneck 104 are removed and used as thecollar 106. As such, theinterior portion neck 104 does not require washing and recoating, which is an expensive process. Another advantage of using thecollar 106 which is applied to the outside of theneck 104 is that, if threads were directly stamped into theneck 104, a recoating process may be required to recoat the inside of the neck with an FDA coating, which again, is an expensive process. Of course, these processes are avoided since theneck 104 is not stamped or otherwise reworked after the necking process. - One of the other desirable features is that once the
collar 106 is removed from the can, it can be reworked and processed as desired. For example, once the threads are formed, the outside surface of thecollar 106 can be powder coated to form a very desirable surface from which to drink. -
FIG. 8 is a side view of another embodiment of areclosable metal bottle 124. As shown inFIG. 8 , acollar 126 is also trimmed from thereclosable metal bottle 124 in the manner described above. However, instead of forming threads, lugs 128 are formed in thecollar 126 using any one of the processes described above. Thelugs 128 have a profile that matches the closure or cap (not shown) so that the closure can be easily applied and engage thelugs 128. The cap can then be sealed on thebottle 124 with a quarter turn. The advantage of lugs over threads is that lugs allow the cap to be opened with a simple quarter turn that eliminates the multiple rotations that are normally required to seal a threaded closure. In addition, threaded closures are more prone to cross-threading than lugs, which further adds to the reliability of being able to form a proper seal using a lug closure device. -
FIG. 9 is a side view of thereclosable metal bottle 124 with thecollar 126 mounted on theneck 132. Any of the processes disclosed above for mounting thecollar 126 on theneck 132 can be used. For example, the curl 130 can be formed in the upper portion of theneck 132 which crimps thecollar 126 mechanically onto theneck 132. The curl 130 creates a crimp above the location of thelugs 128 so that the curl 130 does not interfere with thelugs 128. -
FIG. 10 is a cut-away view of thereclosable metal bottle 124, illustrating thelugs 128 and theneck 132. -
FIG. 11 illustrates another embodiment of areclosable metal bottle 134. As shown inFIG. 11 , acollar 136 is trimmed from theneck 140 in the manner disclosed above. Thecollar 136 can then be processed, as disclosed above, to form pressure release lugs 138. The pressure release lugs 138, as well as the collar, can be processed and formed using any of the desired processes disclosed above, including the backfilling and coating of the pressure release lugs 138. -
FIG. 12 is a side view of thereclosable metal bottle 134. Thecollar 136 is mounted on theneck 140. Again, any of the processes for mounting of thecollar 136 on theneck 140, such as disclosed above, can be used. The pressure release lugs 138 are adapted to engage a closure device such as a cap that is designed to engage the pressure release lugs 138 and form a seal with thecurl 142. The pressure release lugs 138 operate such that a small turn of the cap allows the seal between the cap and thecurl 142 to open slightly and release pressure around the side of the cap and between the pressure release lugs 138, while still maintaining the cap engaged with the pressure release lugs 138 so that the cap will not be ejected from the top of thereclosable metal bottle 134. The cap can then be turned farther to release the cap from the pressure release lugs 138. The pressure release lugs 138 provide a safe and convenient type of closure. -
FIG. 13 is a cut-away view of thereclosable metal bottle 134 ofFIG. 12 . As illustrated inFIG. 13 , the pressure release lugs 138 are disposed around the periphery of thecollar 136 for engagement with a closure device (a pressure release lug cap). -
FIG. 14 is a cut-away view of the embodiment ofFIGS. 12 and 13 . As shown inFIG. 14 , thecollar 136 is fit around theneck 140 and secured in position by thecurl 142. Curl 142 can also overlap thecollar 136 and crimp thecollar 136 in a secure position on theneck 140. As indicated above, notches can also be made in the edge of thecurl 142 and the top of thecollar 136 to prevent rotation of thecollar 136 on theneck 140. As also shown inFIG. 14 , the pressure release lugs 138 are formed in thecollar 136 and protrude outwardly for engagement with a closure device such as a cap. Again, all the different methods of mounting including gluing and bonding thecollar 136 to theneck 140 can be used, as well as backfilling the pressure release lugs 138, to provide additional strength and rigidity to the pressure release lugs 138. - The various embodiments therefore provide a unique reclosable metal bottle in which a trimmed portion of the neck can be reused and mounted on the neck to provide the structural rigidity necessary to form threads or lugs for recloseability, and result in a substantial savings in the overall cost of the reclosable metal bottle. Thin wall metal bottles, having thicknesses on the order of thin wall metal cans currently in use, can be made using this process with minimal material waste since the trimmed neck portion is being reused as a threaded collar. Structural rigidity and strength can be added by using fillers to backfill the indentations of the threads in the collar. Threads or lugs can be used, including pressure release lugs, that add both safety and convenience. Since the reclosable metal bottle is an all-metal container, the bottle can be recycled without introducing contaminants. Backfill and bonding agents can be chosen that do not introduce contaminants in the melting recycling process.
- The foregoing description of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the appended claims be construed to include other alternative embodiments of the invention except insofar as limited by the prior art.
Claims (13)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/468,911 US20070051687A1 (en) | 2005-09-07 | 2006-08-31 | Reclosable metal bottle |
PCT/US2006/034736 WO2007030554A2 (en) | 2005-09-07 | 2006-09-07 | Reclosable metal bottle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US71505205P | 2005-09-07 | 2005-09-07 | |
US11/468,911 US20070051687A1 (en) | 2005-09-07 | 2006-08-31 | Reclosable metal bottle |
Publications (1)
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US20070051687A1 true US20070051687A1 (en) | 2007-03-08 |
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ID=37829083
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US11/468,911 Abandoned US20070051687A1 (en) | 2005-09-07 | 2006-08-31 | Reclosable metal bottle |
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US (1) | US20070051687A1 (en) |
WO (1) | WO2007030554A2 (en) |
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