EP0737624A2 - Leicht zu öffenender Deckel mit einer Kerbe in einem konischen Bereich - Google Patents

Leicht zu öffenender Deckel mit einer Kerbe in einem konischen Bereich Download PDF

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Publication number
EP0737624A2
EP0737624A2 EP95420100A EP95420100A EP0737624A2 EP 0737624 A2 EP0737624 A2 EP 0737624A2 EP 95420100 A EP95420100 A EP 95420100A EP 95420100 A EP95420100 A EP 95420100A EP 0737624 A2 EP0737624 A2 EP 0737624A2
Authority
EP
European Patent Office
Prior art keywords
incision
angle
strip
panel
central panel
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.)
Granted
Application number
EP95420100A
Other languages
English (en)
French (fr)
Other versions
EP0737624B1 (de
EP0737624A3 (de
Inventor
Jean-Marc Legresy
Jean - Pierre Richard
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.)
Trivium Packaging West France SAS
Original Assignee
Pechiney Emballage Alimentaire
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
Priority to EP95420100A priority Critical patent/EP0737624B1/de
Application filed by Pechiney Emballage Alimentaire filed Critical Pechiney Emballage Alimentaire
Priority to HU9802582A priority patent/HU226349B1/hu
Priority to PCT/FR1996/000571 priority patent/WO1996032334A1/fr
Priority to AU56525/96A priority patent/AU5652596A/en
Priority to DE69607337T priority patent/DE69607337T2/de
Priority to EP96913590A priority patent/EP0820409B1/de
Priority to US08/930,431 priority patent/US6004089A/en
Priority to ES96913590T priority patent/ES2144238T3/es
Publication of EP0737624A2 publication Critical patent/EP0737624A2/de
Publication of EP0737624A3 publication Critical patent/EP0737624A3/de
Application granted granted Critical
Publication of EP0737624B1 publication Critical patent/EP0737624B1/de
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
    • B65D17/404—Details of the lines of weakness

Definitions

  • the invention relates to the field of containers with easy opening and more particularly metal lids with easy opening.
  • the easy-opening lids have a generally peripheral incision in the case of containers for food products, as shown in FIGS. 1a to 1c, FIGS. 1a and 1b corresponding to easy-opening lids with bowl, or have a localized incision at a small portion of the lid panel in the case of a lid for a beverage can.
  • the incisions are defined by their profile and the residual metal thickness under the incision which is also called the "residual".
  • a profile is defined by the angle alpha of the incision and by the calculated width P of the bottom of the incision.
  • a typical incision is shown in Figure 2 where the angle alpha is 60 ° and the width P is 40 ⁇ m and is designated by "60P40".
  • FIG. 7 represents in section an incision after crimping and sterilization, having, at the bottom of the incision, characteristic cracks which the present invention proposes if not to eliminate entirely, at least to reduce very strongly.
  • the problem is to find a way to manufacture, reliably and economically, COF with low residual whose bottom of the incisions is not cracked at the end of manufacture, nor after packaging of the product to be packaged.
  • the easy-opening metal cover with central panel and crimping edge comprises an incision on an incision strip, part of said panel on which said incision is formed, and a ring allowing the perforation of said incision and said opening.
  • said incision band makes a non-zero angle beta with respect to the mean plane of said central panel.
  • said strip is located at the periphery of the central panel and the inner skirt of the edge to be crimped, and forms an inclined plane between said central panel and said skirt, as illustrated in FIGS. 3a and 3b, having the shape of a corner cone portion at the top 180 ° -2.beta.
  • said cover is a convercle with a peripheral counter-bowl, in which said strip is located on the periphery of the central panel and of said counter-bowl, and forms an inclined plane between said central panel and said counter-cup, as illustrated in FIGS. 3c, 3f and 3g, having the shape of a portion of cone of angle at the top 180 ° -2.beta.
  • said cover is a cover with partial opening, for example a cover for a beverage can in which said strip forms a non-zero angle beta inclined plane bordering the part of said panel intended to be opened, as illustrated in Figures 3d and 3e.
  • said strip does not close on itself, as in the previous cases.
  • the inclination of said incision strip can be oriented at an angle of +/- beta relative to said mean plane of the central panel, considered as a horizontal plane (see FIGS. 3a and 3b).
  • Said beta angle is generally between 5 ° and 45 °. Indeed, for a beta angle less than 5 °, the desired effect (reduction of cracks) obtained is relatively moderate. Furthermore, as the problem posed is solved with a beta angle less than 45 °, there is no technical interest in making an incision on an incision band having a slope greater than 45 °.
  • Said beta angle is preferably between 10 and 30 °. As the embodiments and the comparative tests will demonstrate, the means of the invention effectively solve the problem posed.
  • Figures 1a to 1c show, in axial section, different shapes of covers with easy opening (1) of the prior art.
  • These covers include a central panel (3) on which there is an incision (2) on the incision strip (6) in a horizontal plane, parallel to the mean plane (17) of the panel (3), and a crimping edge (4).
  • the central panel is provided with a rivet (7) which fixes a ring (8), the spout (9) of which is located in line with the incision (2) so as to ensure the opening by tilting of the ring.
  • the crimping edge (4) comprises a skirt (5), strongly inclined, connecting to said central panel, possibly by a bowl (20).
  • Figures 1a to 1c are distinguished by the presence of a bowl (20) in the case of Figures 1a and 1b, and by the position of the incision (2) located in the plane of said central panel in the case of Figures 1a and 1c, and at the bottom of the bowl (20) in the case of FIG. 1b.
  • Figure 2 shows in axial section an incision (2).
  • An incision (2) is defined, for a thickness E of the metal layer, by an angle alpha, by a calculated value P of the bottom (10) of the incision, by a value R of the residual thickness (11) (also called “residual").
  • the sides of the incision were designated by 16a and 16b.
  • Figures 3a, 3b and 3c show, in axial section similar to that of Figures 1a to 1c, easy-opening cover portions (1) according to the invention having a sloping incision strip (6).
  • Figures 3a and 3b illustrate the position of the incision (2) on the incision strip (6) forming the bottom of the bowl (20).
  • This strip (6) has a slope of angle beta with respect to the plane (17), corresponding to the horizontal mean plane of said central panel (3).
  • said strip (6) has a slope of an angle + beta, while the angle is -beta in Figure 3b.
  • FIG. 3c illustrates the position of the incision (2) on the incision strip (6) forming the periphery of the central area (3), externally limited by the counter-bowl (18).
  • This strip (6) has an angle slope + beta relative to the plane (17).
  • FIG. 3f is a top view showing the incision strip (6) in the form of a hatched crown, the incision (2) passing through the center of this strip.
  • Figure 3f is an axial section along the axis BB of Figure 3f, showing that said strip (6) has the shape of a cone portion with an angle at the top equal to 180 ° - 2.beta.
  • Figures 3d and 3e relate to a partial opening lid of the beverage can.
  • Figure 3d is a top view and Figure 3e is a section along the axis A-A of Figure 3d.
  • the incision strip (6) does not form a closed strip on itself, but has the shape of a horseshoe, the open part of which remains attached to the central panel (3) of the cover.
  • the ring (8) is positioned on the side of this open part, and by tilting forwards tears the incision (2) and fold the tongue delimited by said incision (2) towards the inside of the box.
  • the invention applies more particularly to covers with easy opening (1) of steel or aluminum or aluminum alloy, with an alpha angle of between 40 and 120 °, of thickness between 0.12 and 0.30 mm (nominal thickness of the metal strip intended to form the metal layer of the easy-opening cover), and of residual thickness R at the bottom of the incision greater than 40 ⁇ m.
  • the residual thickness value R is generally between 60 and 140 ⁇ m, depending on the nature of the metal strip, and according to the value of said nominal thickness.
  • the angle alpha is preferably between 40 ° and 60 ° and the width P at the bottom of the incision is between 10 and 40 ⁇ m.
  • These preferential values are those which correspond to the best ease of opening.
  • the invention also includes a method of manufacturing easy-opening covers (1) in which said incision is obtained by punching, with the aid of an alpha angle punch, an incision band (6) d 'a cover blank, in a vertical direction (19) perpendicular to the mean plane of said central panel (3), said incision strip having a non-zero angle angle beta slope.
  • the alpha angle can be between 40 and 120 °, and the beta angle is generally between 5 and 45 °.
  • Said incision strip (6) with a beta angle slope is formed by stamping a metal strip in a manner known per se during the formation of the cover blank. Given the high precision of the tools for manufacturing the covers, it suffices that said strip has a width of the order of 1 mm to be assured that said incision (2) will always be well positioned on said strip (6) with a slope of 'beta angle.
  • Said punch (13) can be oriented at a gamma angle relative to said perpendicular direction (19) between two extreme values such that one of these values corresponds to a punch having one of its vertical faces (16a), as shown in Figure 4a, the other value corresponding to a punch having the other of its faces (16b) vertical, as shown in Figure 6a.
  • the blank cover not incised is positioned on an anvil of suitable shape so that the incision strip (6) is resting on said anvil during the action of said punch.
  • All the covers with easy opening were made from aluminum strip of alloy 5182 (designation according to the Aluminum Association), nominal thickness of 270 ⁇ m, varnished on both sides, and in the corresponding metallurgical state H28 in a strongly hardened state, restored during the opening).
  • Standard easy-opening covers (1) of 73 mm in diameter were manufactured, with a peripheral incision according to FIG. 3a, incision having a profile of the "60P40" type (alpha angle of 60 ° and a calculated value of dish at the bottom 40 ⁇ m incision).
  • the lids obtained were crimped onto boxes which were then sterilized in a standard manner (30 min at 125 ° C). Cuts were made on the covers as manufactured, on the covers after crimping and on the covers after sterilization, so as to be able to carry out observations under the microscope by reflection and to assess the presence and extent of cracks at the bottom of the incision. .
  • the residual metal layer under the incision is particularly sensitive to the action of corrosion due to the ingredients of the packaged products (possible presence of acids and / or salts), and the sensitivity to corrosion increases with the presence of cracks, or the presence of cracks of greater length.
  • the damage to the incision which can be quantified by the presence of cracks and the length of the cracks, and the resistance to corrosion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Closures For Containers (AREA)
  • Sewage (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP95420100A 1995-04-14 1995-04-14 Verfahren zum Herstellen eines leicht zu öffnenden Deckels mit einer Kerbe in einem schrägen Bereich Expired - Lifetime EP0737624B1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP95420100A EP0737624B1 (de) 1995-04-14 1995-04-14 Verfahren zum Herstellen eines leicht zu öffnenden Deckels mit einer Kerbe in einem schrägen Bereich
PCT/FR1996/000571 WO1996032334A1 (fr) 1995-04-14 1996-04-15 Procede de fabrication de couvercles a ouverture facile a incision amelioree
AU56525/96A AU5652596A (en) 1995-04-14 1996-04-15 Method for making easy-open lids with improved scoring
DE69607337T DE69607337T2 (de) 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben
HU9802582A HU226349B1 (hu) 1995-04-14 1996-04-15 Eljárás javított bemetszésû dobozfedelek készítésére
EP96913590A EP0820409B1 (de) 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben
US08/930,431 US6004089A (en) 1995-04-14 1996-04-15 Method for making easy-open lids with improved scoring
ES96913590T ES2144238T3 (es) 1995-04-14 1996-04-15 Procedimiento de fabricacion de tapas de facil apertura con incision mejorada.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95420100A EP0737624B1 (de) 1995-04-14 1995-04-14 Verfahren zum Herstellen eines leicht zu öffnenden Deckels mit einer Kerbe in einem schrägen Bereich

Publications (3)

Publication Number Publication Date
EP0737624A2 true EP0737624A2 (de) 1996-10-16
EP0737624A3 EP0737624A3 (de) 1996-10-30
EP0737624B1 EP0737624B1 (de) 1999-10-13

Family

ID=8221571

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95420100A Expired - Lifetime EP0737624B1 (de) 1995-04-14 1995-04-14 Verfahren zum Herstellen eines leicht zu öffnenden Deckels mit einer Kerbe in einem schrägen Bereich
EP96913590A Expired - Lifetime EP0820409B1 (de) 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP96913590A Expired - Lifetime EP0820409B1 (de) 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben

Country Status (7)

Country Link
US (1) US6004089A (de)
EP (2) EP0737624B1 (de)
AU (1) AU5652596A (de)
DE (1) DE69607337T2 (de)
ES (1) ES2144238T3 (de)
HU (1) HU226349B1 (de)
WO (1) WO1996032334A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999008819A1 (en) * 1997-08-15 1999-02-25 Crown Cork & Seal Technologies Corporation Easy open can ends
EP1044886A4 (de) * 1997-09-30 2001-03-07 Nippon Steel Corp Leicht und vorzüglich zu öffnender dosendeckel sowie verfahren zu seiner herstellung
US8939308B2 (en) 2009-09-04 2015-01-27 Crown Packaging Technology, Inc. Full aperture beverage end
US9714114B2 (en) 2013-11-08 2017-07-25 Crown Packaging Technology, Inc. Full aperture can end

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9914351A (pt) 1998-10-08 2001-06-26 Schmalbach Lubeca Bloqueio de ruptura temporário em uma tampa de chapa
EP1308226A1 (de) * 2001-11-06 2003-05-07 Impress B.V. Leicht zu öffnender Verschluss, Behälter mit einem solchen Verschluss und Vorrichtung zu seiner Herstellung
MY138331A (en) * 2004-12-09 2009-05-29 Crown Packaging Technology Inc Method of and apparatus for forming a closure
USD647400S1 (en) 2010-06-10 2011-10-25 Crown Packaging Technology, Inc. Full aperture open beverage can
USD669781S1 (en) 2010-08-23 2012-10-30 Crown Packaging Technology, Inc. Full transversely oriented oval aperture can
USD685266S1 (en) 2010-10-18 2013-07-02 Silgan Containers Llc Can end
US9550604B2 (en) 2010-10-18 2017-01-24 Silgan Containers Llc Can end with strengthening bead configuration
USD653109S1 (en) 2010-10-18 2012-01-31 Stolle Machinery Company, Llc Can end
WO2016200799A1 (en) * 2015-06-08 2016-12-15 Novelis Inc. Beverage can end score tooling
KR101635800B1 (ko) * 2015-09-15 2016-07-04 주식회사 도루코 분절 가능한 양날형 면도날

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132328A (en) 1977-04-20 1979-01-02 National Can Corporation Panel with opening means

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Publication number Priority date Publication date Assignee Title
US3338199A (en) * 1965-03-17 1967-08-29 American Can Co Scoring apparatus and method
US3650006A (en) * 1968-12-11 1972-03-21 American Can Co Score manufacture
US3688718A (en) * 1969-10-23 1972-09-05 Aluminum Co Of America Method and apparatus for scoring metal container ends
CH530829A (de) * 1970-02-06 1972-11-30 Rasselstein Ag Verfahren und Werkzeug zur Herstellung einer Prägekerbe in einem Metallblech
US3946683A (en) * 1972-12-26 1976-03-30 Aluminum Company Of America Tabless container opening device and method and tools for forming the same
US3977341A (en) * 1974-06-06 1976-08-31 Aluminum Company Of America Easy opening container component
US3964414A (en) * 1974-06-11 1976-06-22 Kaiser Aluminum & Chemical Corporation Easy open end method and apparatus
US4039100A (en) * 1976-07-28 1977-08-02 Wells Robert A Container having non-removable opening member with attached opening lever
US4202287A (en) * 1977-04-20 1980-05-13 National Can Corporation Method of attaching tab to end panel
JPS60204452A (ja) * 1984-03-30 1985-10-16 谷内　啓二 開口縁の安全な容器蓋
US5252019A (en) * 1992-01-21 1993-10-12 Weirton Steel Corporation Convenience-feature non-circular end closure with interrupted panel profiling

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132328A (en) 1977-04-20 1979-01-02 National Can Corporation Panel with opening means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999008819A1 (en) * 1997-08-15 1999-02-25 Crown Cork & Seal Technologies Corporation Easy open can ends
EP1044886A4 (de) * 1997-09-30 2001-03-07 Nippon Steel Corp Leicht und vorzüglich zu öffnender dosendeckel sowie verfahren zu seiner herstellung
US8939308B2 (en) 2009-09-04 2015-01-27 Crown Packaging Technology, Inc. Full aperture beverage end
US10053260B2 (en) 2009-09-04 2018-08-21 Crown Packaging Technology, Inc. Full aperture beverage end
US9714114B2 (en) 2013-11-08 2017-07-25 Crown Packaging Technology, Inc. Full aperture can end

Also Published As

Publication number Publication date
DE69607337D1 (de) 2000-04-27
EP0820409A1 (de) 1998-01-28
DE69607337T2 (de) 2000-08-24
HUP9802582A2 (hu) 1999-02-01
EP0820409B1 (de) 2000-03-22
HUP9802582A3 (en) 2000-05-29
HU226349B1 (hu) 2008-09-29
EP0737624B1 (de) 1999-10-13
WO1996032334A1 (fr) 1996-10-17
AU5652596A (en) 1996-10-30
ES2144238T3 (es) 2000-06-01
US6004089A (en) 1999-12-21
EP0737624A3 (de) 1996-10-30

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