US3688718A - Method and apparatus for scoring metal container ends - Google Patents

Method and apparatus for scoring metal container ends Download PDF

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Publication number
US3688718A
US3688718A US868778A US3688718DA US3688718A US 3688718 A US3688718 A US 3688718A US 868778 A US868778 A US 868778A US 3688718D A US3688718D A US 3688718DA US 3688718 A US3688718 A US 3688718A
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US
United States
Prior art keywords
scoring
metal
container end
indenter
rib
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.)
Expired - Lifetime
Application number
US868778A
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English (en)
Inventor
Howard D Schrecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howmet Aerospace Inc
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Aluminum Company of America
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Publication date
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Publication of US3688718A publication Critical patent/US3688718A/en
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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
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4012—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening partially by means of a tearing tab
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/404—Details of the lines of weakness

Definitions

  • ABSTRACT [52] US. Cl. ..113/15 A, 113/80 DA
  • a method and apparatus for scoring a metal container [51] Int. Cl. ..B21d 51/26 en to provide a ear-out panel, wherein the scoring is [58] Field of Search-.1 13/ 15 R, 15 A, 80 D, 80 DA, accomplished with a greatly reduced tendency for any 1 3 121 R, 21 A, 121 220 5 internal protective coating on said end to be damaged and for the residual metal in thescore line to fracture.
  • This invention relates generally to sheet metal ends for containers and to a method and means for making the same, and in particular to the art of forming container ends having a tear-out panel defined by a score pattern, which panel may be removed manually without the use of a separate tool or a can opener, and to the method and means for scoring such container ends.
  • Container ends for the so called easy opening cans such as cans for beer, carbonated soft drinks, fruit juices, and the like, are usually made of metal, preferably aluminum or an alloy thereof, and vary in thickness from about 0.008 inch to 0.015 inch. It is common practice to provide the inner surface of the containers, as well as the container ends, with protective coatings, particularly when the containers are to be filled with carbonated beverage, fruit juices and other liquids which might react with and/or attack the metal of the container. For easy severance of a tear-out panel it is necessary to score most metals deeply enough to leave a thin residual web of metal along the score line.
  • a purpose of the present invention is to reduce the likelihood of damaging the coatings on the inner surface of container ends during the scoring operation. This is accomplished by a new method of scoring which employs novel apparatus, as hereinafter described.
  • the invention provides a simple and effective method and apparatus for scoring container covers or ends and simultaneously working the inner portion of the metal in the container end whereby the stresses developed in the metal during the scoring operation are distributed to greatly reduce the tendency for the protective coating on such ends to be damaged or for the metal residual in the score lines to fracture.
  • FIG. 1 is a top plan view of a container end having a tear-out panel therein defined by a weakening line scored by the method of the invention
  • FIG. 2 is a fragmentary sectional view through a conventional scoring die set of the prior art
  • FIG. 3 is a fragmentary sectional view, on a somewhat larger scale of a scoring die set employed in the preferred form of the present invention
  • FIG. 4 is a fragmentary sectional view through a scoring die set of a modified form of the present invention.
  • FIG. 5 is a fragmentary section view through a container end scored in accordance with the present invention.
  • FIG. 6 is a fragmentary section view through a container end scored by a conventional method.
  • numeral 20 generally designates a typical easy opening container end panel that may have a score line-defined tear-out portion 22 formed therein in accordance with the invention, although not intended to be limiting of the configuration of container ends or tear-out portions that may be so formed.
  • Container end 20 has an attachment flange 24 for attaching the end to a container body (not shown) in a conventional manner, and has a pull tab 28 attached to tear-out portion 22 by means of an integral rivet 30.
  • scoring container ends regardless of what score pattern might be desired, has been effected by means of a stamping or scoring die set, similar to that shown in FIG. 2.
  • the set comprises an upper score die 10 and a lower anvil die 11, the latter having a flat upper face 12 that affords anvil support to the container end panel 13 when seated thereon.
  • the upper die 10 has a scoring indenter l4 projecting down from its lower face 15 toward the lower anvil die, said indenter formation duplicating in contour the tearout panel contour or configuration.
  • the scoring indenter has in vertical, transverse, cross-section, a truncated V- shape with a flat lower or working face 16 to effect displacement scoring.
  • V-shaped score indenters have also been employed, but at a sacrifice of tool life. Scoring part way through the thickness of the metal, leaving a uniform residual about 0.004 inch thick is normally desired in aluminum container ends for ease of severance of the tear-out panel, although the residual thickness may vary depending on the particular application.
  • the dimensions of the working face 16 and the height of the indenter to achieve the desired shape and depth of the score will also depend upon the type of metal or alloy used and the thickness of the metal to be scored.
  • the purpose of the present invention is to minimize such damage to the protective coating now experienced in conventional scoring operations. This is achieved by a new method of scoring which works the metal in the bottom half of the sheet in the vicinity of the score, which working distributes the stresses produced in the metal during the scoring operation and results in greatly reducing the tendency of the coating to fracture.
  • an arcuately domed rib is employed on the lower die member, which effectively works the metal of the lower half of the sheet metal to distribute the above-mentioned stresses. This will now be described with reference to FIG. 3 where a preferred embodiment of the apparatus is disclosed.
  • the scoring die set of FIG. 3 comprises an upper die member 110 and a lower die member 111.
  • the upper die carries a scoring indenter 114 projecting downwardly towards the lower die member.
  • the indenter tool preferably has a truncated V-shaped crosssection in profile and a flat lower or working face 116 similar to that previously described.
  • the lower die 111 has its upper supporting face 112 provided with an arcuately domed rib 200 aligned with the scoring indenter 114, as shown, and having the same contour or outline as that of the indenter.
  • a container end panel as generally designated by the numeral 113 may have a protective coating 118 on its lower or inner surface and is seated upon and supported by the dome surface 200 of the anvil die.
  • the indenter engages and penetrates the metal sheet 113 producing the stresses previously mentioned, but in this instance the arcuate surface of the supporting die works the metal of the sheet in the lower half thereof to distribute the stresses.
  • the distribution of stresses greatly reduces the tendency for the protective coating to fracture or become damaged in the scoring operation.
  • This distribution of the stresses by the employment of the arcuate anvil may also greatly reduce the formation of cracks in the residual metal of the score.
  • the radius of curvature 201 of the domed anvil is preferably about 0.010 inch, but may be as much as 0.015 inch. If the radius of curvature is much less than 0.010 inch, it has been found that the metal may be scored by the rib rather than being worked as is desired in the present invention.
  • Rib 200 is preferably at least 0.0020 inch in height and has approximately a 0.010 inch radius 203 at the juncture between its domed surface and the supporting face 1 12.
  • the method of the invention will give a score residual in the 0.0035 inch to 0.004 inch thickness range in aluminum container ends nominally about 0.010 inch thick without fracturing of the internal coating.
  • Typical coatings for such sheet metal ends have included epoxy, epoxy phenolic or vinyl resins, among others, and may be baked or otherwise cured on the ends.
  • a typical curing operation may be conducted at approximately 400 F. for approximately 10 minutes per side, but may be conducted at various other temperatures and durations depending on the coating, etc.
  • FIGS. 5 and 6 which illustrate the grain structures produced in container ends scored by the improved method (FIG. 5) and by the conventional method (FIG. 6), the difference between such grain structures clearly shows the difference in the stresses in the ends.
  • the grain structure in the end scored by the improved method is of uniform orientation and spacing adjacent the inner surface of the ends, and has an area of converging grain orientation intermediate the top and bottom surfaces of the residual metal
  • the grain structure in the end scored by conventional methods shows an area of converging grain orientation near the bottom surface of the end.
  • These areas of converging grain orientation represent the areas of maximum stresses in the residual metal of the container ends. As illustrated by the arrows, the metal in the areas of maximum stress is compressed in the vertical and extruded horizontally outward.
  • the coating on the metal at the point of maximum stress is similarly highly stressed and is subject to rupture as illustrated.
  • the metal and coating on the inner or lower surface of the residual is under much less stress and is much less likely to be damaged.
  • FIG. 4 discloses a modified tool set which is also effective in reducing damage to coatings and the formation of cracks in the residual metal. While this form of the invention is not as practical or desirable, in that the indenter tool 210 of the upper die is of special design embodying a special scoring tool 214, the arcuately domed area 206 has been found effective in working the metal of the sheet and distributing the stresses set up by the indenter tool. It is noted that the arcuately domed rib 206 is higher than dome 200 shown in FIG. 3. It is believed that differences in the height of such rib is not critical to the practice of the invention as long as it is at least 0.0020 inch high since the metal working is effected primarily by the upper portion only of the rib.
  • a method of scoring a metal container end to provide a tear-out panel therein comprising the steps of:
  • An apparatus for scoring a thin metal container end to provide a tear-out section comprising an anvil die on which the container end is supported in scoring position, a reciprocable indenter movable towards and away from said anvil die, an arcuately domed rib on said anvil die facing said scoring indenter and supporting the container end, said arcuately domed rib having a radius of curvature in the range of 0.010 to 0.015 inch and cooperating with the scoring indenter during scoring of the container end to subject the lower portion of the metal of the container end to a working action to distribute the stresses induced in the scoring operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
US868778A 1969-10-23 1969-10-23 Method and apparatus for scoring metal container ends Expired - Lifetime US3688718A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86877869A 1969-10-23 1969-10-23

Publications (1)

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US3688718A true US3688718A (en) 1972-09-05

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US868778A Expired - Lifetime US3688718A (en) 1969-10-23 1969-10-23 Method and apparatus for scoring metal container ends

Country Status (11)

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US (1) US3688718A (xx)
JP (1) JPS5114949B1 (xx)
CA (1) CA926215A (xx)
CH (1) CH531376A (xx)
DE (1) DE2051697A1 (xx)
ES (1) ES384824A1 (xx)
FR (1) FR2065484B1 (xx)
GB (1) GB1329583A (xx)
NL (1) NL7014886A (xx)
SE (1) SE382765B (xx)
ZA (1) ZA706790B (xx)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868919A (en) * 1973-12-06 1975-03-04 Aluminum Co Of America Method and apparatus for forming easy opening container walls
US3938455A (en) * 1973-05-07 1976-02-17 Aluminum Company Of America Method of forming and a construction for a digitally openable container closure
US3970023A (en) * 1975-04-25 1976-07-20 Continental Can Company, Inc. Tooling arrangement for end closure scoring
US4122791A (en) * 1977-06-30 1978-10-31 Dayton Reliable Tool & Manufacturing Company Method and apparatus for scoring an enameled metal surface
US4216736A (en) * 1979-02-02 1980-08-12 Boise Cascade Corporation Method and apparatus for forming no-fin scored metal ends
US4348464A (en) * 1978-11-29 1982-09-07 The Continental Group, Inc. Combination score tool and score anvil
US4504181A (en) * 1978-11-29 1985-03-12 Continental Can Company, Inc. Method of forming scored metal sheet
US5219257A (en) * 1990-11-21 1993-06-15 Koch Systems Incorporated Self-opening can lid with improved contour of score and means for making
US5252019A (en) * 1992-01-21 1993-10-12 Weirton Steel Corporation Convenience-feature non-circular end closure with interrupted panel profiling
US5938390A (en) * 1997-12-15 1999-08-17 Aluminum Company Of America Antifracture scores for easy open container walls
EP0896929A3 (en) * 1997-08-12 2000-03-29 Nkk Corporation Easy-opening can end and method for making the same
EP1046589A2 (en) * 1999-04-20 2000-10-25 Nkk Corporation Easy opening can end and method for fabricating the same
EP1308226A1 (en) * 2001-11-06 2003-05-07 Impress B.V. Easy opening closure, container provided with such closure, and apparatus for producing such closure
US6761281B2 (en) 2002-11-26 2004-07-13 Rexam Beverage Can Company Modified score for smooth openability
US20060260043A1 (en) * 2005-05-18 2006-11-23 Rivera Samuel T Threaded mack washer
US20120131848A1 (en) * 2009-07-24 2012-05-31 Dr. Reisacher Winzerbedarf Gmbh Vineyard Stake
WO2016200799A1 (en) * 2015-06-08 2016-12-15 Novelis Inc. Beverage can end score tooling
US10723906B2 (en) * 2011-12-02 2020-07-28 Ppg Industries Ohio, Inc. Coating composition for a food or beverage can
US11952164B1 (en) 2012-08-10 2024-04-09 Powercan Holding, Llc Resealable container lid and accessories including methods of manufacture and use

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006700A (en) * 1975-05-05 1977-02-08 Usm Corporation Method for making container closures
DE2816860C2 (de) * 1978-04-18 1983-03-10 Styner & Bienz Ag, Niederwangen, Bern Verfahren und Vorrichtung zur Herstellung eines Aerosoltrichters
DE3319949A1 (de) * 1983-06-01 1984-12-06 Schmalbach-Lubeca Gmbh, 3300 Braunschweig Verfahren und anordnung zum herstellen von aufreisslinien in metallblechen, insb. zur herstellung von aufreissdeckeln fuer dosen oder dgl. behaelter
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
JPH11105867A (ja) * 1997-09-30 1999-04-20 Nippon Steel Corp 開缶性及び耐食性に優れた樹脂被覆金属板製内外面無補修型易開缶蓋

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR488984A (fr) * 1917-09-08 1918-12-03 Helmer Varden Dispositif pour ouvrir les boites de conserves et autres boites en tole
US3254790A (en) * 1963-07-24 1966-06-07 Aluminum Co Of America Easy open tear strip can ends
US3338199A (en) * 1965-03-17 1967-08-29 American Can Co Scoring apparatus and method
US3359773A (en) * 1964-03-03 1967-12-26 Metal Box Co Ltd Scoring of thin sheet metal
US3451367A (en) * 1964-03-30 1969-06-24 Kaiser Aluminium Chem Corp Method of fabricating container-opening device
US3507418A (en) * 1968-10-01 1970-04-21 Nat Steel Corp Scoreline formation and repair
US3554400A (en) * 1964-02-18 1971-01-12 Continental Can Co Nonflipping beer can end
US3563199A (en) * 1962-11-13 1971-02-16 Hunt Foods And Ind Inc Can top construction and method of fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191564A (en) * 1963-05-15 1965-06-29 Ermal C Fraze Method of fabricating a sheet metal joint
GB1249687A (en) * 1969-01-10 1971-10-13 Metal Box Co Ltd Improvements in scoring metal container components

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR488984A (fr) * 1917-09-08 1918-12-03 Helmer Varden Dispositif pour ouvrir les boites de conserves et autres boites en tole
US3563199A (en) * 1962-11-13 1971-02-16 Hunt Foods And Ind Inc Can top construction and method of fabrication
US3254790A (en) * 1963-07-24 1966-06-07 Aluminum Co Of America Easy open tear strip can ends
US3554400A (en) * 1964-02-18 1971-01-12 Continental Can Co Nonflipping beer can end
US3359773A (en) * 1964-03-03 1967-12-26 Metal Box Co Ltd Scoring of thin sheet metal
US3451367A (en) * 1964-03-30 1969-06-24 Kaiser Aluminium Chem Corp Method of fabricating container-opening device
US3338199A (en) * 1965-03-17 1967-08-29 American Can Co Scoring apparatus and method
US3507418A (en) * 1968-10-01 1970-04-21 Nat Steel Corp Scoreline formation and repair

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938455A (en) * 1973-05-07 1976-02-17 Aluminum Company Of America Method of forming and a construction for a digitally openable container closure
US3868919A (en) * 1973-12-06 1975-03-04 Aluminum Co Of America Method and apparatus for forming easy opening container walls
US3970023A (en) * 1975-04-25 1976-07-20 Continental Can Company, Inc. Tooling arrangement for end closure scoring
US4122791A (en) * 1977-06-30 1978-10-31 Dayton Reliable Tool & Manufacturing Company Method and apparatus for scoring an enameled metal surface
US4348464A (en) * 1978-11-29 1982-09-07 The Continental Group, Inc. Combination score tool and score anvil
US4504181A (en) * 1978-11-29 1985-03-12 Continental Can Company, Inc. Method of forming scored metal sheet
US4216736A (en) * 1979-02-02 1980-08-12 Boise Cascade Corporation Method and apparatus for forming no-fin scored metal ends
US5219257A (en) * 1990-11-21 1993-06-15 Koch Systems Incorporated Self-opening can lid with improved contour of score and means for making
US5252019A (en) * 1992-01-21 1993-10-12 Weirton Steel Corporation Convenience-feature non-circular end closure with interrupted panel profiling
US6837093B2 (en) 1997-08-12 2005-01-04 Nkk Corporation Methods for making an easy-opening can end
EP0896929A3 (en) * 1997-08-12 2000-03-29 Nkk Corporation Easy-opening can end and method for making the same
US20020170913A1 (en) * 1997-08-12 2002-11-21 Nkk Corporation Methods for making an easy-opening can end
US5938390A (en) * 1997-12-15 1999-08-17 Aluminum Company Of America Antifracture scores for easy open container walls
EP1046589A2 (en) * 1999-04-20 2000-10-25 Nkk Corporation Easy opening can end and method for fabricating the same
EP1046589A3 (en) * 1999-04-20 2001-05-30 Nkk Corporation Easy opening can end and method for fabricating the same
US6435368B1 (en) 1999-04-20 2002-08-20 Nkk Corporation Easy opening can end and method for fabricating the same
WO2003039785A1 (en) * 2001-11-06 2003-05-15 Impress B.V. Easy opening closure, container provided with such closure, and apparatus for producing such closure
EP1308226A1 (en) * 2001-11-06 2003-05-07 Impress B.V. Easy opening closure, container provided with such closure, and apparatus for producing such closure
US20050082291A1 (en) * 2001-11-06 2005-04-21 Ad Emmerzaal Easy opening closure, container provided with such closure, and apparatus for producing such closure
US6761281B2 (en) 2002-11-26 2004-07-13 Rexam Beverage Can Company Modified score for smooth openability
US20060260043A1 (en) * 2005-05-18 2006-11-23 Rivera Samuel T Threaded mack washer
US20120131848A1 (en) * 2009-07-24 2012-05-31 Dr. Reisacher Winzerbedarf Gmbh Vineyard Stake
US10723906B2 (en) * 2011-12-02 2020-07-28 Ppg Industries Ohio, Inc. Coating composition for a food or beverage can
US11952164B1 (en) 2012-08-10 2024-04-09 Powercan Holding, Llc Resealable container lid and accessories including methods of manufacture and use
WO2016200799A1 (en) * 2015-06-08 2016-12-15 Novelis Inc. Beverage can end score tooling

Also Published As

Publication number Publication date
CH531376A (fr) 1972-12-15
DE2051697A1 (de) 1971-05-06
ZA706790B (en) 1971-07-28
FR2065484A1 (xx) 1971-07-30
NL7014886A (xx) 1971-04-27
ES384824A1 (es) 1973-09-01
JPS5114949B1 (xx) 1976-05-13
GB1329583A (en) 1973-09-12
SE382765B (sv) 1976-02-16
FR2065484B1 (xx) 1973-05-25
CA926215A (en) 1973-05-15

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