RECLOSABLE METAL BOTTLE
Disclosed is an unique reclosable metal bottle in which a trim portion of the neck can be reused and mounted on the neck as a collar, or a separate collar provided, that has the structural rigidity necessary to form threads or lugs for recloseability. 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 trim neck portion is 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.
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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.
BACKGROUND OF THE INVENTIONa. 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.
SUMMARY OF THE INVENTIONThe 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.
BRIEF DESCRIPTION OF THE DRAWINGS
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, 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. 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 the neck portion 104 to form threads for a reclosable metal bottle.
The collar 106 of
The neck portion 104, including the collar 106, 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. By using the thickness of the metal in the collar 106 together with the thickness of the metal in the neck 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 combined collar 106 and neck 104 to further reduce metal thickness, as explained below.
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 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.
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
1. A method of making a reclosable metal bottle comprising:
- necking a body portion of said reclosable metal bottle to form a neck portion that includes an extended neck portion;
- trimming said extended neck portion from said neck portion to form a collar;
- working said collar to form threads and increase the diameter of said collar;
- backfilling indentations formed by said threads in the collar with a backfiller material;
- placing said collar over said neck;
- securing said collar to said neck.
2. The method of making a reclosable metal bottle of claim 1 wherein said step of securing said collar to said neck comprises mechanically securing said collar to said neck by forming a curl in the top portion of said neck that engages said collar.
3. The method of making a reclosable metal bottle as set forth in claim 1 wherein said step of securing said collar to said neck further comprises bonding said collar to said neck using bonding agents that comprise said backfiller material that backfills indentations in said collar formed by said threads.
4. The method of making a reclosable metal bottle as set forth in claim 1 wherein said step of necking a body portion to form a neck portion comprises a drawing and ironing process.
5. A reclosable metal bottle comprising:
- a thin wall metal body portion;
- a neck portion that has been formed from said thin wall metal body portion;
- a collar trimmed from said neck portion and secured to an outside surface of said neck portion;
- threads formed in said collar;
- filler material that is backfilled into openings formed by said threads on the inside surface of said collar, said filler material providing strength and rigidity to said threads.
6. The reclosable metal bottle of claim 5 wherein said filler material comprises a bonding adhesive.
7. The reclosable metal bottle of claim 5 further comprising a bonding adhesive disposed between said collar and said neck.
8. A method of making a reclosable metal bottle comprising:
- necking a body portion of said reclosable metal bottle to form a neck portion;
- providing a metal collar;
- working said collar to form threads and increase the diameter of said collar;
- backfilling indentations formed by said threads in said collar with a backfiller material;
- placing said collar over said neck;
- securing said collar to said neck.
9. The method of making a reclosable metal bottle of claim 8 wherein said step of securing said collar to said neck comprises mechanically securing said collar to said neck by forming a curl in a top portion of said neck that engages said collar.
10. The method of making a reclosable metal bottle as set forth in claim 8 wherein said step of securing said collar to said neck further comprises bonding said collar to said neck using bonding agents that comprise said backfiller material that backfills indentations in said collar formed by said threads.
11. A reclosable metal bottle comprising:
- a thin wall metal body portion;
- a neck portion that has been formed from said thin wall metal body portion;
- a metal collar that is secured to an outside surface of said neck portion;
- threads formed in said collar;
- filler material that is backfilled into openings formed by said threads on the inside surface of said collar, said filler material providing strength and rigidity to said threads.
12. The reclosable metal bottle of claim 11 wherein said filler material comprises a bonding adhesive.
13. The reclosable metal bottle of claim 11 further comprising a bonding adhesive disposed between said collar and said neck.
Type: Application
Filed: Aug 31, 2006
Publication Date: Mar 8, 2007
Applicant: OMNITECH INTERNATIONAL, INC (Golden, CO)
Inventor: Christopher Olson (Superior, CO)
Application Number: 11/468,911
International Classification: B65B 7/28 (20060101);