WO2016200799A1 - Outillage de formation d'entaille d'extrémité de canette de boisson - Google Patents

Outillage de formation d'entaille d'extrémité de canette de boisson Download PDF

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Publication number
WO2016200799A1
WO2016200799A1 PCT/US2016/036199 US2016036199W WO2016200799A1 WO 2016200799 A1 WO2016200799 A1 WO 2016200799A1 US 2016036199 W US2016036199 W US 2016036199W WO 2016200799 A1 WO2016200799 A1 WO 2016200799A1
Authority
WO
WIPO (PCT)
Prior art keywords
approximately
inches
score
coating
proximal end
Prior art date
Application number
PCT/US2016/036199
Other languages
English (en)
Inventor
Mckay C. Brown
Vishwanath Hegadekatte
Original Assignee
Novelis Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Novelis Inc. filed Critical Novelis Inc.
Publication of WO2016200799A1 publication Critical patent/WO2016200799A1/fr

Links

Classifications

    • 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
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs

Definitions

  • This invention relates to tooling used for scoring an aluminum can end.
  • Aluminum cans are designed to hold and dispense beverages, food, and other liquid products.
  • the interior of the can includes a protective coating to prevent the contents of the can from reducing the integrity of the can.
  • aluminum can end stock materials are coated on both sides of the sheet with layers of coatings that are cured in ovens. These liquid coatings that have been applied and cured may also include internal and external lubricants that help with the end forming process. In the past, these coatings were typically made of epoxy resins that harden when cured. In recent years, there has been a push to move away from epoxy resins due to concerns associated with Bisphenol A (BP A).
  • BP A Bisphenol A
  • Described herein are improved scoring instruments for reducing or eliminating feathering along a coated aluminum can end once the scored profile is punctured and the opening is formed.
  • the profile of the scoring tool is configured so that it
  • a system for forming a score in a material includes an aluminum can and a tool.
  • the aluminum can includes a can end and an interior of the can end includes a coating.
  • the tool includes a tool holder and a scoring knife.
  • the scoring knife includes a proximal end configured to form the score in the can end.
  • the proximal end has a width configured to minimize feathering of the coating when the score is punctured.
  • the coating on the interior of the can end is a laminate coating.
  • the width of the proximal end of the scoring knife is between approximately 0.0005 inches and approximately 0.0020 inches.
  • the width of the proximal end is between approximately 0.0005 inches and approximately 0.0015 inches. In other examples, the width of the proximal end is between approximately 0.0005 inches and approximately 0.00125 inches. In certain cases, the width of the proximal end is between approximately 0.0005 inches and approximately 0.00075 inches.
  • the scoring knife comprises sides that, when viewed in cross- section, are separated from one another by approximately 50 degrees to approximately 75 degrees. In some examples, the sides are separated from one another by approximately 60 degrees to approximately 70 degrees. In some cases, the sides are separated from one another by approximately 65 degrees to approximately 70 degrees,
  • the proximal end is configured to form a coating depression in the coating that is less than approximately 0.0004 inches.
  • the coating depression is less than approximately 0.0003 inches.
  • the coating depression is less than approximately 0.0002 inches.
  • the coating depression is less than approximately 0.0001 inches.
  • Figure 1 is a perspective view of an end of a beverage can.
  • Figure 2 is a schematic showing a depression made in the metal on the interior of a can from pressure exerted while scoring the can end.
  • Figure 3 A illustrates a cross-sectional view of a proximate end of a scoring knife according to an example.
  • Figure 3B illustrates a cross-sectional view of a proximate end of a scoring knife according to an example.
  • Figure 3C illustrates a cross-sectional view of a proximate end of a scoring knife according to an example.
  • Figure 4 is a contour plot depicting the heights of depressions in the scored area on the interior of a can end by score knives having various widths and score angles.
  • Figure 5A illustrates a perspective view of a score profile formed in a can with the scoring knife of Figure 3 A.
  • Figure 5B illustrates a perspective view of a score profile formed in a can with the scoring knife of Figure 3B.
  • Figure 5C illustrates a perspective view of a score profile formed in a can with the scoring knife of Figure 3C.
  • Figure 6 illustrates as produced and post-testing feathering rates for the score knives of Figures 3A-C.
  • Figure 7 illustrates a can end with reduced feathering after the score profile has been punctured and partially opened.
  • a tool for scoring the end of an aluminum can including a scoring knife holder and an improved scoring knife for scoring a can end plate.
  • the scoring knife holders can be any suitable (current or future) scoring knife holder.
  • Figure 1 illustrates a can 20 with an end plate 28 having an integrated "pop-top” or “pop-tab” opening feature 30,
  • the opening feature 30 is a score 24 that defines an oval, round or other suitably shaped area 26.
  • a metal rivet 16 secures an aluminum tab (such as tab 22 in Figure 1) to the end plate 28 proximate to the score 24.
  • the tab 22 is raised, the forces of the tab 22 "pop” or crack the score 24 and push the area 26 inward toward the interior of the can 20, This action creates an opening that provides access to the contents of the can 20.
  • the end plate 28 that attaches or is seamed to the can 20 is scored by a sharp contoured instrument or scoring knife 10 (illustrated in Figure 2) that incises or cuts the oval, rounded, or other suitably shaped score 24 into the end plate 28.
  • This score 24 must be deep enough to "pop" or crack and open completely when the tab 22 applies its opening forces. On the other hand, the score 24 must be shallow
  • the interior of the can 20 may include a protective coating to prevent the contents of the can 20 (which are potentially corrosive) from reducing the integrity of the can 20.
  • These coatings are prone to feathering and/or inconsistent ripping when the score profile is broken to reveal the opening. Feathering occurs when the coating fails to break or rips improperly and unwanted residual coating remains attached to the area 26 and/or the opening that is revealed after the score 24 is broken,
  • the coating is also more likely to feather if it is damaged during the score forming process.
  • the bottom side of a cutting instrument or scoring knife 10 (illustrated in Figure 2) can ultimately create highly compressive forces in the metal and the forces transfer to the product side coatings or laminates on the side of the end plate 28 opposite of the score 24. These compressive scoring forces can create unwanted coating depressions along the bottom of the score 24 on the product side coating.
  • Figure 2 illustrates an example of a coating depression 18 created during the score forming process because of the high scoring pressures exerted by the cutting instrument or scoring knife 10.
  • Figures 3A-C illustrate cross-sectional views of non-limiting examples of profiles
  • the scoring knife 10 has a proximal end 12 and sides 17A-B.
  • the proximal end 12 has a width 14 and the sides 17A-B are angled at an angle ⁇ relative to the proximal end 12.
  • the angle ⁇ and width 14 of the scoring knife 10 can be configured to minimize the creation a score 24 that is susceptible to feathering upon puncturing.
  • the angle ⁇ and width 14 of the scoring knife 10 can be optimized to minimize the pressure exerted on the can end plate 28 when the score 24 is formed.
  • depressions 18 can be less than or equal to about 0.0004 inches, such as less than or equal to about 0.0003 inches, less than or equal to about 0.0002 inches, or less than or equal to about 0.0001 inches.
  • the width 14 of the scoring knife 10 can be from about 0.0005 inches to about 0.0020 inches, such as from about 0.0005 inches to about 0.0015 inches, from about 0.0005 inches to about 0.00125 inches, or from about 0.0005 inches to about 0.00075 inches.
  • the angle ⁇ of the scoring knife 10 can be from about 50° to about 75°, such as from about 60° to about 70° or from about 65° to about 70°.
  • Scoring knives 10 with angles ⁇ and widths 14 within or approximate these respective ranges can be used to form scores 24 having reduced depression heights, and therefore reduced risk of feathering.
  • a scoring knife 10 with the angle ⁇ and width 14 exerts less pressure and/or force on the can 20 and reduces or minimizes the height h of the depression 18 in the can end plate 28 along the score 24. This in turn can reduce the de-lamination of the laminate or other coating on the product side (the side opposite the scored side of the can end plate 28). Reduced de-lamination can improve/reduce the risk of feathering when the score 24 is punctured as the pop top opening feature 30 is popped to open the can 20.
  • Figure 3 A illustrates an example of a scoring knife 10A that has a profile 40 A with a width 14 of about 0.0014 inches and an angle ⁇ of about 49.3°.
  • Figure 5A illustrates the score 24 formed in can 20 using the scoring knife 10A.
  • Figure 3B illustrates an example of a scoring knife 10B that has a profile 40B with a width 14 of approximately 0.0027 inches and an angle ⁇ of approximately 44.2°
  • Figure 5B illustrates the score 24 formed in can 20 using the scoring knife 10B.
  • Figure 3C illustrates an example of a scoring knife IOC that has a profile 40C with an angle ⁇ of approximately 71.4° and a width 14 of approximately 0.0016 inches.
  • Figure 5C illustrates the score 24 formed in can 20 using the scoring knife OC.
  • Figure 4 is a contour plot illustrating the heights h of the depressions 18 formed in the can end plate 28 when the can end plate 28 is scored with score knives 10 having various angles ⁇ (shown along the horizontal axis) and various widths 14 (shown along the vertical axis).
  • a scoring knife 10 with a higher angle ⁇ and a narrower width 14 can be utilized to create depressions 18 having reduced heights.
  • the combination of a wide angle ⁇ and a narrow width 14 of the proximal end 12 of the scoring knife 10 helps reduce the risk of feathering, as described above.
  • Figure 6 illustrates feathering rates for scores in can ends having either a developmental polyester laminate labeled 12-2 ("coating 1") or a developmental polyester laminate labeled 4-2 ("coating 2") using the scoring knives l OA-C.
  • “score design 1" corresponds to the scoring knife 10A
  • “score design 2” corresponds to the scoring knife IOC
  • “score design 3” corresponds to the scoring knife 10B.
  • the first score tested (identified in Figure 6 as "1-2”) was a score formed by the scoring knife IOC in a can having the laminate 12-2 coating.
  • the second score tested (identified in Figure 6 as "1-1”) was a score formed by the scoring knife 10A in a can having the laminate 12-2 variable.
  • the third score tested (identified in Figure 6 as "1-3") was formed by the scoring knife lOB in a can having the laminate 12-2 variable.
  • the fourth score tested (identified in Figure 6 as "2-2") was formed by the scoring knife IOC in a can having the laminate 4-2 variable.
  • the fifth score tested (identified in Figure 6 as "2-1") was formed by the scoring knife 10A in a can having the laminate 4-2 variable.
  • the sixth score tested (identified in Figure 6 as "2-3") was formed by the scoring knife 10B in a can having the laminate 4-2 variable.
  • the score 1-2 had a mean rating of fail
  • the score 1-1 had a mean rating of fail
  • the score 1-3 had a mean rating of fail
  • the score 2-2 had a mean rating of pass
  • the score 2-1 had a mean rating of fail
  • the score 2-3 had a mean rating of borderline.
  • any of the samples had a fail rating had a fail rating, then the entire sample set has a fail rating, score 1-2 and score 2-2, both formed from the scoring knife IOC (with the angle ⁇ of approximately 71.4° and the width 14 of approximately 0.0016 inches), had a reduced likelihood of feathering when punctured as compared to scores formed the scoring knives lOA and lOB (i.e. scores 1-3, 1-1, 2- 3, and 2-1).
  • scores formed with the scoring knife IOC in both the laminate 12-2 coating (coating 1) and the laminate 4-2 coating (coating 2) passed testing at the time the scores were created. Scores formed with the scoring knife IOC in the laminate 4-2 coating (coating 2) also passed after 5-day L85 testing.
  • the other scores formed with the scoring knife IOC had a mean rating of fail.
  • the other scores formed with the scoring knife 10B had a mean rating of fail.
  • Figure 7 illustrates an example of the can end plate 28 with a score 24 formed by the scoring knife IOC with reduced feathering after the score 24 has been punctured and partially opened .
  • determining the optimal profile involves determining the optimal angle and optimal width of the cutting instrument for creating the scoring in the can end.
  • the optimal profile will vary depending on factors such as customer preferences, the shape and/or diameter and/or area of the desired opening in the can end, the material and/or the thickness of the can end.
  • Example 1 A system for forming a score in a material comprising: an aluminum can comprising a can end, wherein an interior of the can end comprises a coating; and a scoring knife comprising a proximal end configured to form the score in the can end, the proximal end having a width configured to minimize feathering of the coating when the score is punctured.
  • Example 2 The system of any of the preceding or subsequent example combinations, wherein the coating is a laminate coating.
  • Example 3 The system of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.0020 inches.
  • Example 4 The system of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.0015 inches.
  • Example 5 The system of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.00125 inches.
  • Example 6 The system of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.00075 inches.
  • Example 7 The system of any of the preceding or subsequent example combinations, wherein the scoring knife comprises sides that, when viewed in cross-section, are separated from one another by approximately 50 degrees to approximately 75 degrees.
  • Example 8 The system of any of the preceding or subsequent example combinations, wherein the sides are separated from another by approximately 60 degrees to approximately 70 degrees.
  • Example 9 The system of any of the preceding or subsequent example combinations, wherein the sides are separated from another by approximately 65 degrees to approximately 70 degrees.
  • Example 10 The system of any of the preceding or subsequent example combinations, wherein the proximal end is configured such that a mean size of any coating depressions formed in the coating is less than approximately 0.0004 inches.
  • Example 11 The system of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions is less than approximately 0.0003 inches.
  • Example 12 The system of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions is less than approximately 0.0002 inches.
  • Example 13 The system of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions is less than approximately 0.0001 inches.
  • Example 14 A tool for scoring an end of an aluminum can, the tool comprising: a tool holder; and a scoring knife comprising a proximal end, the proximal end having a width configured form a score in the aluminum can and to minimize feathering of a coating of the aluminum can when the score is punctured.
  • Example 15 The tool of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0,0005 inches and approximately 0.0020 inches.
  • Example 16 The tool of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.0015 inches.
  • Example 17 The tool of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.00125 inches.
  • Example 18 The tool of any of the preceding or subsequent example combinations, wherein the width of the proximal end is between approximately 0.0005 inches and approximately 0.00075 inches.
  • Example 19 The tool of any of the preceding or subsequent example combinations, wherein the scoring knife comprises sides that, when viewed in cross-section, are separated from one another by approximately 50 degrees to approximately 75 degrees.
  • Example 20 The tool of any of the preceding or subsequent example combinations, wherein the sides are separated from another by approximately 60 degrees to approximately 70 degrees.
  • Example 21 An aluminum can comprising a can end, wherein an interior of the can end comprises a coating and wherein a mean size of any coating depressions in the coating is less than approximately 0.0004 inches.
  • Example 22 The aluminum can of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions in the coating is less than approximately 0.0003 inches.
  • Example 23 The aluminum can of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions in the coating is less than approximately 0.0002 inches.
  • Example 24 The aluminum can of any of the preceding or subsequent example combinations, wherein the mean size of any coating depressions in the coating is less than approximately 0.0001 inches.
  • Example 25 The aluminum can of any of the preceding or subsequent example combinations, wherein an exterior of the can end comprises a score, and wherein the coating depressions are aligned with the score.
  • Example 26 A method of forming an aluminum can comprising a can end and an interior, the interior comprising a coating, the method comprising: attaching the can end to the can; and creating a score in the can end using a scoring knife, wherein the scoring knife comprises a proximal end having a width configured to minimize feathering of the coating when the score is punctured, and wherein a mean size of any depressions formed in the coating is less than approximately 0.0004 inches.
  • Example 27 The method of any of the preceding or subsequent example combinations, wherein the width of the proximal end of the scoring knife is between approximately 0.0005 inches and approximately 0.0020 inches.
  • Example 28 The method of any of the preceding or subsequent example combinations, wherein the width of the proximal end of the scoring knife is between approximately 0.0005 inches and approximately 0.0015 inches.
  • Example 29 The method of any of the preceding or subsequent example combinations, wherein the width of the proximal end of the scoring knife is between approximately 0.0005 inches and approximately 0.00125 inches,
  • Example 30 The method of any of the preceding or subsequent example combinations, wherein the width of the proximal end of the scoring knife is between approximately 0.0005 inches and approximately 0.00075 inches.
  • Example 31 The method of any of the preceding or subsequent example combinations, wherein creating the score in the can end comprises forming depressions in the coating having a mean size of less than approximately 0.0003 inches.
  • Exampl e 32 The method of any of the preceding or subsequent example combinations, wherein creating the score in the can end comprises forming depressions in the coating having a mean size of less than approximately 0.0002 inches.
  • Example 33 The method of any of the preceding or subsequent example combinations, wherein creating the score in the can end comprises forming depressions in the coating having a mean size of less than approximately 0.0001 inches,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Ceramic Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)

Abstract

La présente invention concerne un système permettant de former une entaille dans un matériau, ledit système comprenant une canette en aluminium et un outil. La canette en aluminium comprend une extrémité de canette et un intérieur de l'extrémité de canette comprend un revêtement. L'outil comprend un porte-outil et une lame d'entaillage. La lame d'entaillage comprend une extrémité proximale configurée de sorte à former l'entaille dans l'extrémité de canette. L'extrémité proximale présente une largeur configurée de sorte à réduire à un minimum l'amincissement du revêtement lorsque l'entaille est perforée.
PCT/US2016/036199 2015-06-08 2016-06-07 Outillage de formation d'entaille d'extrémité de canette de boisson WO2016200799A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201562172536P 2015-06-08 2015-06-08
US62/172,536 2015-06-08

Publications (1)

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WO2016200799A1 true WO2016200799A1 (fr) 2016-12-15

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PCT/US2016/036199 WO2016200799A1 (fr) 2015-06-08 2016-06-07 Outillage de formation d'entaille d'extrémité de canette de boisson

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WO (1) WO2016200799A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200130220A1 (en) * 2018-10-31 2020-04-30 Stolle Machinery Company, Llc Score die, score die forming system, and associated method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688718A (en) * 1969-10-23 1972-09-05 Aluminum Co Of America Method and apparatus for scoring metal container ends
US3728980A (en) * 1971-02-10 1973-04-24 Fraze Ermal C Scoring die
US4122791A (en) * 1977-06-30 1978-10-31 Dayton Reliable Tool & Manufacturing Company Method and apparatus for scoring an enameled metal surface
US5064087A (en) * 1990-11-21 1991-11-12 Koch Systems Incorporated Self-opening can lid with improved contour of score
US5738237A (en) * 1995-06-07 1998-04-14 Aluminum Company Of America Easy open container end, method of manufacture, and tooling
US20050199627A1 (en) * 2004-03-11 2005-09-15 Heinicke Paul R. Easy open can end and process of making

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968899A (en) * 1974-03-14 1976-07-13 Aluminum Company Of America Easy-open container wall and apparatus
US3977341A (en) * 1974-06-06 1976-08-31 Aluminum Company Of America Easy opening container component
US5373721A (en) * 1993-02-05 1994-12-20 Aluminum Company Of America Method and apparatus for scoring metal panels and resultant product
US5770290A (en) * 1993-12-01 1998-06-23 Mchenry; Robert J. Easy open end of a metal-plastic construction
EP0737624B1 (fr) * 1995-04-14 1999-10-13 Impress Metal Packaging Sa Procédé de fabrication d'un couvercle à ouverture facile à incision dans une zone inclinée
WO2007091740A1 (fr) * 2006-02-09 2007-08-16 Toyo Seikan Kaisha, Ltd. fermeture d'extrémité facile à ouvrir

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688718A (en) * 1969-10-23 1972-09-05 Aluminum Co Of America Method and apparatus for scoring metal container ends
US3728980A (en) * 1971-02-10 1973-04-24 Fraze Ermal C Scoring die
US4122791A (en) * 1977-06-30 1978-10-31 Dayton Reliable Tool & Manufacturing Company Method and apparatus for scoring an enameled metal surface
US5064087A (en) * 1990-11-21 1991-11-12 Koch Systems Incorporated Self-opening can lid with improved contour of score
US5738237A (en) * 1995-06-07 1998-04-14 Aluminum Company Of America Easy open container end, method of manufacture, and tooling
US20050199627A1 (en) * 2004-03-11 2005-09-15 Heinicke Paul R. Easy open can end and process of making

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