US3339789A - Scored metal can - Google Patents

Scored metal can Download PDF

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Publication number
US3339789A
US3339789A US463499A US46349965A US3339789A US 3339789 A US3339789 A US 3339789A US 463499 A US463499 A US 463499A US 46349965 A US46349965 A US 46349965A US 3339789 A US3339789 A US 3339789A
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US
United States
Prior art keywords
score line
groove
metal
integral
impact
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
US463499A
Other languages
English (en)
Inventor
Ralph J Stolle
Elton G Kaminski
Frederick J Close
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.)
Stolle Corp
Original Assignee
Stolle Corp
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 Stolle Corp filed Critical Stolle Corp
Priority to US463499A priority Critical patent/US3339789A/en
Priority to SE7584/66A priority patent/SE310348B/xx
Priority to DE19661552095 priority patent/DE1552095A1/de
Priority to NL6608205A priority patent/NL6608205A/xx
Priority to GB26405/66A priority patent/GB1136006A/en
Priority to CH853966A priority patent/CH461410A/de
Priority to BE682492D priority patent/BE682492A/xx
Application granted granted Critical
Publication of US3339789A publication Critical patent/US3339789A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • This invention relates to a scored metal can end and a method of manufacturing the same.
  • Metal cans have generally been made either as threepiece cans or two-piece cans.
  • the can body is made from sheet metal and two separate end members are provided which are then secured to the body to complete the can.
  • More recently cans have been made in the two-piece form wherein the can body and one can end are integral and a separate end is later attached to the open end of the piece having the body with one integral end.
  • Two-piece cans may be made in several ways.
  • One of these is the so-called wall iron process wherein a shallow cup is produced from sheet metal by conventional drawing techniques and is then redrawn to a cup of longer length and smaller diameter and the redrawn cup is then wall ironed to produce the required body length and wall thickness.
  • a second way of forming a can body with an integral end is the so-called impact and iron forming process wherein a short cup of proper diameter but with a heavy wall thickness is formed by the so-called impact-extrusion-forming process.
  • the impact extruded short cup is then pushed through ironing dies to reduce the wall thick ness and increase the length of the cup to the required length for trimming and flanging operations.
  • a third way of producing a can body with an integral end is the so-called impact-extrusion-forming process wherein a metal disc or slug is extruded into a die in an impact-extrusion-forming apparatus under tremendous pressure. In this process the entire forming operation is completed almost instantaneously and no further ironing of the wall is necessary.
  • the wall thickness in the end is not uniform. This is particularly true where the can end instead of being flat is concave. This creates a problem in providing a score line to define an area which was torn out by means of a tab, in that the score line will tear easily in thin portions of the end wall and will not tear easily in thicker portions thereof.
  • one of the principal objects of the present invention is to provide a can end, whether it be a separate end or one integral with the can body, having a score line leaving a substantially uniform thickness of metal to be torn during the opening operation.
  • Another object of the invention involves the scoring of the can end prior to the application of any lacquer or enamel so as to eliminate the necessity for over-coating or repair coating. This can be done regardless of the technique by which the can end is formed and regardless of whether the can end is formed separately or integrally with the can body.
  • Another object of the invention is to provide a can body with an integral end or what is known as a two-piece can, wherein the integral end is provided with the scoring and with the pull tab. This has the advantage in that a simple plain can end is all that is required to complete the package.
  • FIG. 1 is a plan view of a can end which may or may not be integral with a body and having a score line defining a portion to be torn out by means of a tab and a rivet for the securing of the tab.
  • FIG. 2 is a diametrical cross sectional view of a can end similar to FIG. 1, wherein the can end is integral with the can body.
  • FIG. 3 is a fragmentary cross sectional view on a greatly enlarged scale taken on the line 4-4 of FIG. 1 after the coining operation and before the scoring operation;
  • FIG. 4 is a view similar to FIG. 3 but after the scoring operation has been performed. It is to be understood that the views of FIGS. 3 and 4 are applicable to either a separate can end or an integral can end and that a separate can end would have substantially the same cross section al appearance as the integral can end of FIG. 2..
  • the can end will gen erally not be of absolutely uniform thickness so that when a score line is formed in such a can end, heavier sections will remain to be torn in some portions of the score line than in others.
  • the can end is subjected to a coining operation wherein, by means of a coin press, a fiat bottomed groove is formed where the score line will later be formed.
  • a coining operation wherein, by means of a coin press, a fiat bottomed groove is formed where the score line will later be formed.
  • this precoining and scoring operation can be performed equally well on a separate can end or on an integral can end and it is performed in the manufacture of the end prior to lacquering or coating, so that the scoring operation does not penetrate the lacquer or enamel coating to expose raw aluminum which would necessitate over-coating or repair coating.
  • a can end is generally indicated at 11. In most cases the can end will have an annular ridge or bead 12. A rivet member 13 will be provided integral with the can end to which, at a later stage of the operation, a pull tab will be assembled and staked in place.
  • the rivet 13 will be produced during the impact extrusion. If the can end has been formed by the draw and wall iron process, the rivet will be formed in the usual manner by a prebubble operation followed by a rivet forming operation.
  • the end or the can body with an integral end is placed in a coin press and a flat bottomed groove 15 is formed therein, as seen in FIG. 3, in the area where the score line is later to be formed.
  • a flat bottomed groove 15 is formed therein, as seen in FIG. 3, in the area where the score line is later to be formed.
  • the tab (shown in broken lines at 17) is then positioned over the rivet 13 and staked in place.
  • a metal can end having a score line defining an area adapted to be torn out by means of a pull tab, said score line lying substantially centrally in a fiat bottomed groove, the thickness of said can end in said fiat bottomed groove being substantially uniform, whereby the amount of metal remaining under said score line is of substantial uniform thickness for easy removal of said area by tearing.
  • Ametal can for beverages and the like having an integral end and constituting one piece of a two-piece can, said integral end having a score line defining an area thereof adapted to be torn out by means of a pull tab, said score line lying substantially centrally in a flat bottomed groove, the thickness of said can end in said fiat bottomed groove being substantially uniform, whereby the amount of metal remaining under said score line is of substantially uniform thickness for easy removal of said area by tearing.
  • a metal can end having a fiat bottomed groove defining an area adapted to be torn out by means of a pull tab, said groove providing at its bottom a substantially uniform thickness of said end throughout the extent of said groove and a score line in the bottom of said groove coextensive with the length of said groove.
  • a metal can for beverages and the like having an integral end, a fiat bottomed groove in said end defining an area adapted to be torn out by means of a pull tab, said groove providing at its bottom a substantially uniform thickness of said end throughout the extent of said groove and a score line in the bottom of said groove coextensive with the length of said groove.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
US463499A 1965-06-14 1965-06-14 Scored metal can Expired - Lifetime US3339789A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US463499A US3339789A (en) 1965-06-14 1965-06-14 Scored metal can
SE7584/66A SE310348B (en)) 1965-06-14 1966-06-02
DE19661552095 DE1552095A1 (de) 1965-06-14 1966-06-11 Perforiertes Blechbuechsenende und Verfahren zum Herstellen desselben
NL6608205A NL6608205A (en)) 1965-06-14 1966-06-14
GB26405/66A GB1136006A (en) 1965-06-14 1966-06-14 Scored metal can end and method of manufacturing the same
CH853966A CH461410A (de) 1965-06-14 1966-06-14 Verfahren zur Herstellung einer Blechdose und nach dem Verfahren hergestellte Dose
BE682492D BE682492A (en)) 1965-06-14 1966-06-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463499A US3339789A (en) 1965-06-14 1965-06-14 Scored metal can

Publications (1)

Publication Number Publication Date
US3339789A true US3339789A (en) 1967-09-05

Family

ID=23840311

Family Applications (1)

Application Number Title Priority Date Filing Date
US463499A Expired - Lifetime US3339789A (en) 1965-06-14 1965-06-14 Scored metal can

Country Status (7)

Country Link
US (1) US3339789A (en))
BE (1) BE682492A (en))
CH (1) CH461410A (en))
DE (1) DE1552095A1 (en))
GB (1) GB1136006A (en))
NL (1) NL6608205A (en))
SE (1) SE310348B (en))

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394837A (en) * 1966-09-06 1968-07-30 Douglas R. Hansen Container opening means
US3416700A (en) * 1967-10-25 1968-12-17 Continental Can Co Safety device for easy opening container ends
US3815534A (en) * 1971-11-18 1974-06-11 Crown Cork & Seal Co Pressure release valves for aerosol cans
US3870001A (en) * 1970-12-31 1975-03-11 Fraze Ermal C Can end with inseparable tear strip
JPS5028072A (en)) * 1973-06-18 1975-03-22
US4157693A (en) * 1977-11-10 1979-06-12 National Can Corporation Seamless drawn and ironed container with opening means and method and apparatus for forming the same
FR2704833A1 (fr) * 1993-05-03 1994-11-10 Metal Box Plc Emballage métallique pour produit alimentaire.
US20100227191A1 (en) * 2009-01-29 2010-09-09 Brown Mckay C Score line corrosion protection for container end walls
US20140323641A1 (en) * 2011-12-02 2014-10-30 Ppg Industries Ohio, Inc. Coating composition for a food or beverage can

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250426A (en) * 1964-02-24 1966-05-10 Ermal C Fraze Pre-puncturing tab

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250426A (en) * 1964-02-24 1966-05-10 Ermal C Fraze Pre-puncturing tab

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394837A (en) * 1966-09-06 1968-07-30 Douglas R. Hansen Container opening means
US3416700A (en) * 1967-10-25 1968-12-17 Continental Can Co Safety device for easy opening container ends
US3870001A (en) * 1970-12-31 1975-03-11 Fraze Ermal C Can end with inseparable tear strip
US3815534A (en) * 1971-11-18 1974-06-11 Crown Cork & Seal Co Pressure release valves for aerosol cans
JPS5028072A (en)) * 1973-06-18 1975-03-22
US4157693A (en) * 1977-11-10 1979-06-12 National Can Corporation Seamless drawn and ironed container with opening means and method and apparatus for forming the same
FR2704833A1 (fr) * 1993-05-03 1994-11-10 Metal Box Plc Emballage métallique pour produit alimentaire.
US20100227191A1 (en) * 2009-01-29 2010-09-09 Brown Mckay C Score line corrosion protection for container end walls
US20140323641A1 (en) * 2011-12-02 2014-10-30 Ppg Industries Ohio, Inc. Coating composition for a food or beverage can
US10723906B2 (en) * 2011-12-02 2020-07-28 Ppg Industries Ohio, Inc. Coating composition for a food or beverage can

Also Published As

Publication number Publication date
GB1136006A (en) 1968-12-11
SE310348B (en)) 1969-04-28
DE1552095A1 (de) 1970-04-09
NL6608205A (en)) 1966-12-15
CH461410A (de) 1968-08-31
BE682492A (en)) 1966-11-14

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