EP0820409B1 - Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben - Google Patents

Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben Download PDF

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Publication number
EP0820409B1
EP0820409B1 EP96913590A EP96913590A EP0820409B1 EP 0820409 B1 EP0820409 B1 EP 0820409B1 EP 96913590 A EP96913590 A EP 96913590A EP 96913590 A EP96913590 A EP 96913590A EP 0820409 B1 EP0820409 B1 EP 0820409B1
Authority
EP
European Patent Office
Prior art keywords
score
punch
process according
incision
strip
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
EP96913590A
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English (en)
French (fr)
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EP0820409A1 (de
Inventor
Jean-Marc Legresy
Jean-Pierre Richard
Marc Langouet
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
Impress Metal Packaging SA
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Filing date
Publication date
Application filed by Impress Metal Packaging SA filed Critical Impress Metal Packaging SA
Priority to EP96913590A priority Critical patent/EP0820409B1/de
Publication of EP0820409A1 publication Critical patent/EP0820409A1/de
Application granted granted Critical
Publication of EP0820409B1 publication Critical patent/EP0820409B1/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 opening easy and especially the metal covers to easy opening.
  • Easy-open covers have an incision generally peripheral in the case of containers for food products, as shown in Figures 1a to 1c, FIGS. 1a and 1b corresponding to covers with easy opening with counter-bowl, or have a incision delimiting a small portion of the cover panel in the case of a lid for a drink can.
  • the incisions are defined by their profile and the thickness of residual metal 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 schematically in Figure 2 with its angle alpha and width P, an incision where the angle alpha is 60 ° with a width P of 40m being symbolically designated by "60P40".
  • the preamble of claim 1 corresponds to this state of the art.
  • Figure 7 shows in section an incision after crimping and sterilization, with cracks at the bottom of the incision characteristics that the present invention proposes otherwise delete entirely, at least reduce very strongly.
  • Sure figure 7 are also represented of crack initiators under the incision.
  • the problem is to find a way to manufacture, so reliable and economical, easy to open covers low residual with the bottom of the incisions not cracked at the end of production, or after packaging of the product to be packed, so as to present, despite a residual poor, satisfactory resistance to mechanical stress and corrosion.
  • a first means leading to an asymmetrical flow of the metal is formed by the use of an asymmetric punch (130) by its geometric configuration, the bisector of the angle alpha making with the direction of said displacement a non-zero gamma angle, as shown in Figure 8.
  • a second means is constituted by the use of a blank of incision band cover (6) at a beta angle different from 0 with respect to the horizontal plane, or different from 90 ° relative to the direction of said movement, said anvil (21), not shown in FIGS. 4a to 6b, capable of have a phi tilt, as shown in the figure 10, which may be different from said beta angle.
  • a third means consists of the use of a asymmetrical punch by its roughness, one side of the alpha angle of the punch being rougher than the other side, this punch may also be symmetrical or not by its profile geometric.
  • a fourth possible means according to the invention consists by the use of an anvil (21) itself comprising a lower relief (210), possibly off-center by at most 500 m with respect to said punch (13,130), or asymmetrical (211) as illustrated in Figures 10 and 11.
  • 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) whose beak (9) is located above 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 counter-cup (20).
  • Figures 1a to 1c are distinguished by the presence of a counter-bowl (20) in the case of FIGS. 1a and 1b, and by the position of the incision (2) located in the plane of said central panel in the case of FIGS. 1a and 1c, and at the bottom of the bowl (20) in the case of Figure 1b.
  • Figure 2 shows in axial section an incision (2).
  • a incision (2) is defined, for a thickness E of the strip metallic, by an angle alpha, by a calculated width P of bottom (10) of the incision, by an R value of the thickness residual (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 FIGS. 1a to 1c, portions of easy opening cover (1) according to the invention having a sloping incision band (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.
  • Figure 3c illustrates the position of the incision (2) on the incision band (6) forming the periphery of the beach central (3), externally limited by the counter-bowl (18).
  • This strip (6) has an angle slope + beta by relative to the plan (17).
  • Figures 3d and 3e relate to an opening cover partial 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 not a band closed on itself, but has the form 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 tilting forward just tear the incision (2) and fold inwards the box the tongue delimited by said incision (2).
  • 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 3g 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.
  • FIG. 8 similar to FIG. 2, represents an incision obtained with an asymmetrical punch with an alpha angle equal to 50 °, and the bisector of which makes a gamma angle equal to 10 ° with the vertical.
  • the delta angle is 35 ° and the rho angle is 15 °.
  • FIG. 9 represents a metallographic section of an incision according to the invention, after anodic oxidation showing the fibers of the metal, that is to say the elongation of the aluminum grains represented by the lines (60).
  • Figure 10 shows in section a sloping anvil (211) surmounted by a symmetrical punch (13).
  • Figure 11 shows in section an anvil having a lower punch (210) off-center with respect to the symmetrical punch (13).
  • said beta angle is generally between 5 ° and 45 °, and preferably less than 30 °.
  • 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 also be oriented at an angle gamma with respect to said perpendicular direction (19) between two extreme values such as one of these values corresponds to a punch having one of its faces vertical (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 third asymmetric flow medium based on the use of a differential roughness of the punch is made possible by the use of incision tools treated in surface and hardness sufficient to maintain said roughness differential during the life of the incision tool.
  • said punch (13) may be a radiated punch, the sides of the punch (14a, 14b) connecting either to each other by the spokes, either with a flat end (151) of said punch.
  • Said punch (13) may have a flat end (151) of generally between 0 and 25 ⁇ m in length, so to obtain an incision of width P less than 40 ⁇ m, and preferably between 10 and 30 ⁇ m.
  • said anvil (21) preferably has, in particular when said anvil does not in itself constitute an asymmetrical flow means, a width L close to a theoretical width L 'defined by the intersection of the base of said incision strip with the extensions of the sides (16a, 16b) of the incision (2), and has a thickness e of at least 10 ⁇ m, and preferably less than the thickness E of said strip incision (6) - see figure 8.
  • said anvil is positioned opposite said intersection, as illustrated in FIG. 8.
  • an asymmetrical flow incision is made according to the invention, as shown in FIG. 9, it is easy to highlight the asymmetrical flow by considering the inflection lines (61) for the same line of metal (60) under or in the vicinity of the incision (2).
  • the inflection lines are substantially symmetrical with respect to the bisector (62) of the angle alpha.
  • the final cover also has a band incision (6) making the same beta angle not zero with respect to in the middle plane (17) of said central panel (3) considered to be said horizontal plane.
  • Said incision band (6) can be located at the periphery the central panel (3) and the inner skirt (5) from the edge to crimp (4), and form an inclined plane between said panel central and said skirt, as illustrated in FIGS. 3a and 3b.
  • the cover may have a peripheral counter-bowl (18) with a raised edge relative to the central panel (3), said incision strip (6), located between the central panel and the counter-bowl (18), forming an inclined plane, as illustrated in Figures 3c, 3f and 3g.
  • Said cover may be partially open, for example a cover for a beverage can, cover in which said incision strip (6) forms an inclined plane bordering the part of said panel intended to be opened, as illustrated in Figures 3d and 3e.
  • said beta angle is between 5 ° and 45 ° and preferably between 10 and 30 °.
  • All the covers with easy opening were made from aluminum strip of alloy 5052 (designation according to the Aluminum Association), nominal thickness of 230 ⁇ m, varnished on both sides, and in the corresponding metallurgical state H48 in a strongly hardened state, restored during the opening.
  • the lids obtained were crimped onto boxes which were then sterilized in a standard manner (30 min at 125 ° C).
  • Metallographic sections 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 using an optical microscope by reflection and assess the presence and extent of cracks at the bottom of the cover. incision and under the incision.
  • primer and crack are based on the fact that the risk of damage does not appear linear with the length of the cracks and that there is a threshold (2-5 ⁇ m) beyond of which there is a high probability that cracking gets worse instead of remaining relatively stable as in the case of crack initiation.
  • the residual metallic layer under the incision is particularly sensitive to the action of the corrosion due to the ingredients of the packaged products (possible presence of acids and / or salts), and the corrosion sensitivity increases with the presence of cracks, or the presence of longer cracks.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Sewage (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (15)

  1. Verfahren zur Herstellung eines leicht zu öffnenden Metalldeckels (1) mit Zentralplatte (3) und Bördelrand (4), mit einer Kerbe (2) auf einem Kerbband (6), welches den Teil der Platte darstellt, auf dem die Kerbe ausgebildet ist, und einem Ring (8), der durch Perforation der Kerbe die Öffnung ermöglicht, bei dem die Kerbe (2) durch Bewegung eines symmetrischen oder unsymmetrischen Stempels (13) mit einem Winkel Alpha auf dem durch einen Amboss (21) abgestützten Kerbband (6) eines Deckelrohlings (100) ausgebildet wird, dadurch gekennzeichnet, dass zur Abschwächung der Gefahr des Auftretens von Rissen im Kerbgrund oder unter der Kerbe einerseits die Ausbildung der Kerbe unter Verwendung eines beliebigen Mittels erfolgt, welches einen unsymmetrischen Fluss des zwischen Stempel (13) und Amboss (21) komprimierten Metalls bei der Bewegung bewirkt, und andererseits der Amboss (21) eine Länge L hat, die in etwa einer Soll-Länge L' entspricht, welche durch die Schnittstelle der Basis des Kerbbands mit den Verlängerungen der Seiten (16a, 16b) der Kerbe definiert ist, sowie eine Dicke e, die mindestens 10 µm beträgt und vorzugsweise geringer ist als die Dicke E des Kerbbands (6).
  2. Verfahren nach Anspruch 1, bei dem das Mittel aus der Verwendung eines asymmetrischen Stempels (130) bedingt durch dessen geometrische Form besteht, wobei die Winkelhalbierende des Winkels Alpha mit der Bewegungsrichtung einen Winkel Gamma ungleich Null bildet.
  3. Verfahren nach Anspruch 1, bei dem das Mittel aus der Verwendung eines Deckelrohlings (100) besteht, dessen Kerbband einen Winkel Beta ungleich Null bezogen auf die Horizontalebene bzw. ungleich 90° bezogen auf die Bewegungsrichtung bildet, wobei der Amboss (21) eine Neigung aufweisen kann, die vom Winkel Beta abweichen kann.
  4. Verfahren nach Anspruch 1, bei dem das Mittel aus der Verwendung eines asymmetrischen Stempels bedingt durch dessen Rauheit besteht, wobei eine Seite des Winkels Alpha des Stempels rauher ist als die andere Seite.
  5. Verfahren nach Anspruch 1, bei dem das Mittel aus der Verwendung eines Ambosses (21) besteht, der selbst eine um höchstens 500 µm zum Stempel (13) versetzte oder unsymmetische untere Erhöhung (210, 211) aufweist.
  6. Verfahren nach Anspruch 2, bei dem dadurch, dass die Bewegungsrichtung den Winkel Alpha des asymmetrischen Stempels in zwei Winkel Delta und Rho teilt, deren Summe gleich dem Winkel Alpha ist, die geometrischen Merkmale des asymmetrischen Stempels durch die Kombination folgender Bedingungen definiert sind :
    der Winkel Alpha beträgt 30 bis 70° und vorzugsweise 40 bis 60°,
    der Absolutwert der Differenz zwischen den Winkeln Delta und Rho beträgt mindestens 3°.
  7. Verfahren nach einem der Ansprüche 1 bis 6, bei dem der Stempel (13) ein strahlenförmiger Stempel ist, wobei die Stempelseiten (14a, 14b) entweder untereinander oder mit einem eventuellen flachen Ende (151) des Stempels verbunden sind.
  8. Verfahren nach Anspruch 7, bei dem der Stempel (13) ein flaches Ende (151) von 0 bis 25 µm Länge aufweist, so dass eine Kerbe mit einer Breite P von weniger als 40 µm und vorzugsweise 10 bis 30 µm erzeugt wird.
  9. Verfahren nach einem der Ansprüche 1 bis 8, bei dem
    der Werkstoff für den Deckel aus Stahl und Eisenlegierungen, Aluminium und Aluminiumlegierungen gewählt wird,
    der Winkel Alpha der Kerbe 30 bis 70° beträgt,
    die Dicke des Deckels 0,12 bis 0,30 mm beträgt (Nenndicke der Metallbahn für den Deckel),
    und die kerbgrundseitige Restdicke mehr als 40 µm beträgt
  10. Verfahren nach Anspruch 9, bei dem der Winkel Alpha vorzugsweise 40 bis 60° und die berechnete Breite P im Kerbgrund 10 bis 40 µm beträgt.
  11. Verfahren nach einem der Ansprüche 9 und 10 und Anspruch 3, bei dem das Kerbband (6) einen Winkel Beta ungleich Null bezogen auf die mittlere Ebene (17) der Zentralplatte (3) bildet.
  12. Verfahren nach Anspruch 11, bei dem das Kerbband (6) eine schiefe Ebene zwischen der Zentralplatte (3) und der Innenkante (5) des Bördelrandes (4) bildet.
  13. Verfahren nach Anspruch 11 mit einer umlaufenden Gegenwölbung (18), bei dem das zwischen der Zentralplatte (3) und der Gegenwölbung (18) angeordnete Kerbband (6) eine schiefe Ebene bildet.
  14. Verfahren nach Anspruch 11 mit partieller Öffnung, bei dem das Kerbband (6) eine schiefe Ebene bildet, die den zu öffnenden Teil der Platte begrenzt.
  15. Verfahren nach einem der Ansprüche 11 bis 14, bei dem der Winkel Beta 5 bis 45° beträgt und vorzugsweise kleiner als 30° ist.
EP96913590A 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben Expired - Lifetime EP0820409B1 (de)

Priority Applications (1)

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

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP95420100 1995-04-14
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
EP96913590A EP0820409B1 (de) 1995-04-14 1996-04-15 Verfahren zur herstellung von leicht zu öffnenden deckeln mit verbesserten kerben

Publications (2)

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EP0820409A1 EP0820409A1 (de) 1998-01-28
EP0820409B1 true EP0820409B1 (de) 2000-03-22

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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

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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

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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)

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US6908005B1 (en) 1998-10-08 2005-06-21 Schmalbach-Lubeca Ag Temporary burst stoppage in a sheet metal top

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GB9717241D0 (en) * 1997-08-15 1997-10-22 Metal Box Plc Easy open can ends
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
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
US8939308B2 (en) 2009-09-04 2015-01-27 Crown Packaging Technology, Inc. Full aperture beverage end
USD653109S1 (en) 2010-10-18 2012-01-31 Stolle Machinery Company, Llc Can end
US9550604B2 (en) 2010-10-18 2017-01-24 Silgan Containers Llc Can end with strengthening bead configuration
US9714114B2 (en) 2013-11-08 2017-07-25 Crown Packaging Technology, Inc. Full aperture can end
US20160354832A1 (en) * 2015-06-08 2016-12-08 Novelis Inc. Beverage can end score tooling
KR101635800B1 (ko) * 2015-09-15 2016-07-04 주식회사 도루코 분절 가능한 양날형 면도날

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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
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US4202287A (en) * 1977-04-20 1980-05-13 National Can Corporation Method of attaching tab to end panel
US4149479A (en) * 1977-04-20 1979-04-17 National Can Corporation Method for forming opening means in panel
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Publication number Priority date Publication date Assignee Title
US6908005B1 (en) 1998-10-08 2005-06-21 Schmalbach-Lubeca Ag Temporary burst stoppage in a sheet metal top

Also Published As

Publication number Publication date
HUP9802582A3 (en) 2000-05-29
EP0820409A1 (de) 1998-01-28
AU5652596A (en) 1996-10-30
DE69607337T2 (de) 2000-08-24
ES2144238T3 (es) 2000-06-01
WO1996032334A1 (fr) 1996-10-17
EP0737624A2 (de) 1996-10-16
DE69607337D1 (de) 2000-04-27
EP0737624A3 (de) 1996-10-30
US6004089A (en) 1999-12-21
HUP9802582A2 (hu) 1999-02-01
EP0737624B1 (de) 1999-10-13
HU226349B1 (hu) 2008-09-29

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