EP0808676B1 - Procédé de fabrication d'un couvercle de boíte à ouverture facile et couvercle de boíte à ouverture facile - Google Patents

Procédé de fabrication d'un couvercle de boíte à ouverture facile et couvercle de boíte à ouverture facile Download PDF

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Publication number
EP0808676B1
EP0808676B1 EP97106499A EP97106499A EP0808676B1 EP 0808676 B1 EP0808676 B1 EP 0808676B1 EP 97106499 A EP97106499 A EP 97106499A EP 97106499 A EP97106499 A EP 97106499A EP 0808676 B1 EP0808676 B1 EP 0808676B1
Authority
EP
European Patent Office
Prior art keywords
opening
sheet metal
base portion
lid
edge
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
EP97106499A
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German (de)
English (en)
Other versions
EP0808676A1 (fr
Inventor
Werner Erfgen
Reiner Dr. Sauer
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.)
ThyssenKrupp Rasselstein GmbH
Original Assignee
Rasselstein Hoesch GmbH
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 Rasselstein Hoesch GmbH filed Critical Rasselstein Hoesch GmbH
Publication of EP0808676A1 publication Critical patent/EP0808676A1/fr
Application granted granted Critical
Publication of EP0808676B1 publication Critical patent/EP0808676B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/506—Rigid or semi-rigid members, e.g. plugs
    • 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
    • B65D17/4011—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 completely by means of a tearing tab

Definitions

  • the invention relates to a method for manufacturing an easy to open can lid from one coated sheet metal blank.
  • the invention relates also an easy-to-open can lid made of sheet metal.
  • Such can lid with which the invention deals consist of a cover ring that through Deep drawing and punching out of a coated Sheet metal blank, e.g. made of tinplate, chromed sheet or aluminum is made.
  • a coated Sheet metal blank e.g. made of tinplate, chromed sheet or aluminum is made.
  • On the outer edge of the Lid ring is an outer flange for later formation a double fold and the inner Edge of the cover ring has a flattened one Curling formed ring flange on, which encloses a lid opening.
  • the ring flange a closing the lid opening Tear-off part attached by heat sealing.
  • the opening extends over the entire, of the relatively narrow Cover ring enclosed area.
  • the one punching out the original opening from the bottom part resulting round sheet metal disc has a diameter which is still much smaller than the diameter the final opening. Since he is with the previous Can lids can no longer be used, the punched discs can only be used as scrap continue to be used. Because the area of the punched out Slice usually more than half of the Area of the original sheet metal blank, the material loss is very high. Come in addition, that one to close the final lid opening requires a separate aluminum foil that coated with a heat sealable layer have to be. This film is used to save material often chosen very thin, so that there is a risk that this film is accidentally punctured.
  • the invention is therefore based on the object Process for making an easy to open Can lid made from a coated sheet metal blank to demonstrate which the reuse of the Punch out the opening of the sheet metal part enables and thus the loss of material on a Minimum reduced.
  • the invention also lies based on the task of an easy-to-open can lid to create the type mentioned above, too with the aim of reusing the die cut To enable sheet metal part and the loss of material to lower.
  • Can lid Starting from the easy to open mentioned above Can lid is the can lid according to the invention characterized in that the cover ring from a one side with a heat sealable coating provided sheet metal blank is that the Tear-off part formed by the punched sheet metal part and that the curl is shaped and flattened is that the can opening is smaller than the punched sheet metal part, its edge area and the ring flange overlap each other.
  • the invention is therefore based on the idea that resulting from punching out the opening from the blank Sheet metal part to continue to use as a tear-open part to the ring flange of the cover ring by heat sealing fasten.
  • Starting material with a heat sealable coating provided sheet metal blank can be used and on the other hand by suitable shaping of the Lid ring the original punched opening be reduced to overlap from to Formation of the opening punched sheet metal part with the To reach the ring flange.
  • a Part of the wall part of the bowl rolled outwards and by suitable design of the deformation tools made sure that the curl already before flattening it and opening it afterwards limited, which is smaller than that originally by Die-cut opening.
  • the invention ensures that the formation bottom part punched out of the blank used to close the opening can be. This will result in material loss reduced a minimum and also an additional, with a heat sealable coating Aluminum foil saved.
  • the metal blank or sheet from which the metal blank is punched out, at least on one side has a heat sealable coating. This Coating can e.g.
  • the finished, easy-to-open can lid is in the Figures 3 and 6 each shown in a partial section, this partial section the edge area of the Can lid 1 shows.
  • This can lid 1 is made from a cover ring 2 and a tear-open part 3.
  • This Tear part 3 is, as described in more detail below with the can lid 1 according to the invention formed by a bottom part, which in the manufacture the cover ring 2 is obtained.
  • Both the cover ring 2 as well as the bottom part 3, which are made from the same sheet metal blank are made, have on the inside - This is the can body in the finished can facing side in the drawings below - a heat sealable coating 4, which only in Figure 8 is shown.
  • This coating can it is a laminated polypropylene film, Polyethylene terephthalate, a sealable lacquer or act.
  • the bottom part 3 is on the ring flange 5 the cover ring 2 sealed.
  • the cover ring 2 has also an outer flange 6, which together with a corresponding outer flange 7 of the can body 8 for Formation of a double fold D serves as shown in FIG. 7 is shown.
  • a sheet is used to manufacture the can lid, e.g. Tinplate, chrome-plated sheet metal or Aluminum sheet, with a thickness between 0.05 and 0.3 mm.
  • This sheet shows on one side that later is referred to as the inside, and that in the finished Can facing the inside of the can, one heat-sealable coating 4 made of an organic Material on as it was mentioned above.
  • This sheet is first turned into a Stamped sheet metal blank, not shown. By This sheet metal blank is deep-drawn according to FIG. 1 the outer flange 6 preformed and also one of the flat rim N surrounded by the outer flange a bottom part 3 and a wall part 9.
  • the bottom part 3 At the flat bowl N is the bottom part 3 above that Wall part 9 connected to the outer flange.
  • the wall part 9 extends substantially perpendicular to Bottom part 3 or perpendicular to the later cover level E-E.
  • the coating 4, not shown is located according to Figure 1 on the downward Side of the outer flange 6 to the left Side of the wall part 9 and the downward Side of the bottom part 3.
  • the bottom part 3 Following the actual deep-drawing process is the bottom part 3, as also shown in Figure 1, in immediate Near its transition to wall part 9 punched out of the bowl and appropriately so that it is punched out according to FIG. 1.
  • the cover ring 2 is preformed, on which Cover ring 2 creates an inner cutting edge 10, which by punching out the bottom part 3 surrounding de-opening 11.
  • the wall part 9 After punching out the bottom part 3, the wall part 9 partially, i.e. part of its total height, rolled outwards, i.e. to the later outside of the lid towards or according to Figure 2 upwards.
  • a curl 19 is formed.
  • the curl 19 In education the curl 19 must be ensured that the original opening 11 is reduced so that the inner boundary 19a of the curl 19 opposite one the original formed by punching Surrounds opening 11 similar, smaller opening 11 '.
  • This desired shaping of the roller 19 for reduction the original opening 11 into a smaller opening 11 ' is by appropriate design of the forming tools causes.
  • the curling of a part of the wall part 9 the cut edge 10 brought to the outside of the cover ring 2. With the outside is also the outside of the final here Can lid meant.
  • the curl 19 is then in the cover ring plane E-E or possibly in a plane parallel to this flattened. This is to be used for heat sealing suitable ring flange 5 formed and also the overlap of the edge area 3a of the base part 3 can be made as large as possible with the ring flange 5.
  • the opening 11 ' reduced again and then the final opening 11 ''.
  • the edge region 3a is finally sealed by heat sealing of the bottom part 3 with that on the outside of the cover ring lying surface of the ring flange 5 connected pressure-tight.
  • the wall part 9 comes by rolling the wall part 9 outwards and the flattening of the curl 19 originally on the underside of the sheet metal blank or on the inside the cover ring 2 located heat sealable Coating in the area of the ring flange 5 to the outside to lie.
  • the coating 4 then becomes the heat sealable Coating 4 of the bottom part 3 sealed.
  • cover ring 2 and bottom part 3 is a particularly good and pressure-tight seal guaranteed between cover ring 2 and bottom part 3.
  • FIG. 4-6 Another way for deep drawing and punching a sheet metal blank for the manufacture of the can lid is shown in Figures 4-6. To avoid repetitions have parts with the same function the same reference numerals as in the Figures 1 - 3. The description given above meets analogously also on those shown in Figures 4-6 Way to make the can lid too.
  • FIG. 4 is now used to form the flat cups N open at the bottom by deep drawing on the outer flange 6 from the later outside of the lid forth a groove 12 with essentially U-shaped cross-section molded into the sheet metal blank.
  • This groove 12 has an outer, directly to the Outer flange 6 adjacent wall part 9b and an the bottom part 3 adjacent inner wall part 9a.
  • These two wall parts 9a and 9b extend after deep drawing essentially perpendicular to later cover level E-E. They are arch-shaped Connector 9c connected to each other.
  • the inner wall part 9a is rolled in, to form the curl 19 and at the same time the original opening 11 into a smaller, similar one Reduce opening 11 '.
  • This holding groove 13 serves similar to the narrow bars, to hold the punched out Bottom part 3 during further transport in the Transfer forming tools so that the bottom part 3 not removed from the cover ring 2.
  • Both in the production route according to FIGS. 1-3 as well as in the second production route according to the Figures 4 - 6 can also be moved so that one starting from that shown in Figures 2 and 5 Condition using the sealing tool at the same time also the curl 19 flattens, then in the End position according to Figure 3 or 6 to the seal produce.
  • the mounting tab 15 can for this purpose, as a comparison of Figures 9 and 10 with Figures 11 and 12 shows different be designed and attached.
  • At the in Figures 9 and 10 illustrated embodiment is in the area where the mounting tab 15 is attached to the bottom part, one in essentially the contour of the fastening tab 15 corresponding score line 16 in the outside of the Indented bottom part. This score line will be in front punching out the bottom part by appropriate Formation of the tools formed.
  • the score line 16 extends to the vicinity of the in Figure 10 with a dashed line indicated overlap and Sealing area of the bottom part. Do you move to Opening the can the opening ring 14 at its the Fastening tab 15 opposite area 14a upwards, the fastening tab 15 tears it Bottom part 3 along the score line 16.
  • the mounting tab 15 of the Opening ring 14 to the outside and is along one Bending edge 15a bent by 180 °. His bent, Free section 15b is in the edge area 3a of the bottom part 3 connected to the outside so that the Bending edge 15a near the outer edge 3b of the Bottom part 3 is arranged and essentially runs parallel to this.
  • the opening flap according to arrow A pivoted upwards about the bending edge 15a and then is pulled in the direction B on the opening ring 14.
  • the opening force is first on the outside Edge 3b of the bottom part initiated and the next Pulling the opening ring 14 will eventually the whole Bottom part 3 along the sealing area from the cover ring 2 deducted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Packages (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Claims (12)

  1. Procédé de fabrication d'un couvercle de boíte (1) facile à ouvrir à partir d'une ébauche de tôle portant un revêtement, comprenant les étapes suivantes:
    emboutissage d'une ébauche pourvue d'un côté d'un revêtement (4) pouvant être scellé à chaud ou thermosoudable, pour la formation d'un collet extérieur (6) sur le bord de l'ébauche en vue de la réalisation ultérieure d'un double pli (D), et pour la formation d'une cuvette (N) de faible profondeur, entourée du collet extérieur, cuvette qui possède une partie fond (3) et une partie paroi (9) qui relie la partie fond au collet extérieur et s'étend pour l'essentiel perpendiculairement à la partie fond,
    découpage d'essentiellement toute la partie fond à proximité immédiate de sa transition à la partie paroi pour la formation d'un anneau de couvercle (2) dont le bord coupé intérieur (10), créé lors du découpage, entoure une ouverture,
    enroulement partiel de la partie paroi vers l'extérieur pour la formation d'un enroulement (19) dont la limite intérieure entoure une ouverture (11') analogue à l'ouverture initiale (11) créée par le découpage, mais plus petite qu'elle, en vue de l'amorçage d'un recouvrement mutuel de la zone du bord ou zone marginale de la partie fond précédemment découpée et de l'enroulement, enroulement (19) sur lequel le bord coupé (10) est situé sur le côté extérieur de l'anneau de couvercle,
    aplatissement de l'enroulement dans le plan de l'anneau de couvercle ou un plan parallèle à lui en vue de la formation d'un rebord annulaire (5) convenant au thermosoudage et pour l'agrandissement du recouvrement, et
    thermosoudage du morceau de fond (3) découpé sur la surface située sur le côté extérieur de l'anneau de couvercle du rebord annulaire pendant l'aplatissement ou après l'aplatisssement de l'enroulement.
  2. Procédé selon la revendication 1, caractérisé en ce que, avant l'enroulement, le morceau de fond (3) découpé est décalé vers l'extérieur par rapport au bord coupé.
  3. Procédé selon la revendication 2, caractérisé en ce que le décalage s'effectue, lors du découpage, par l'outil de découpage.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce que, pour la formation de la cuvette, une rainure (12), ayant en section droite une forme essentiellement en U, est formée adjacente au collet extérieur et à partir du côté ultérieurement extérieur du couvercle, par emboutissage dans l'ébauche de tôle, rainure qui présente une partie paroi extérieure directement adjacente au collet extérieur et une partie paroi intérieure adjacente à la partie fond, et que, après le découpage de la partie fond, la partie paroi intérieure est enroulée.
  5. Procédé selon la revendication 1 ou 4, caractérisé en ce que, lors de l'enroulement de la partie paroi, une rainure de maintien (13) pour le bord du morceau de fond découpé, rainure qui est ouverte vers l'ouverture, est formée adjacente au bord coupé de l'enroulement.
  6. Procédé selon une des revendication 1 à 4, caractérisé en ce que, lors du découpage de la partie fond, quelques étroites languettes de liaison sont préservées entre cette partie fond et la partie paroi pour maintenir le morceau de fond découpé à la position voulue sur l'anneau de couvercle pendant le transfert à d'autres postes de déformation.
  7. Procédé selon une des revendications 1 à 6, caractérisé en ce qu'une patte de fixation (15), reliée à un anneau d'ouverture ou une languette d'ouverture, est fixée par thermosoudage, collage ou analogue, à la zone marginale de la partie fond, sur le côté extérieur de celle-ci.
  8. Procédé selon la revendication 7, caractérisé en ce que, avant le découpage de la partie fond dans la zone sur laquelle doit être fixée ultérieurement la patte de fixation, une ligne d'entailles (16), correspondant essentiellement au contour de la patte de fixation, est pressée dans le côté extérieur de la partie fond (3), ligne d'entailles qui s'étend jusqu'à proximité de la zone de recouvrement et de scellement ultérieure du morceau de fond découpé.
  9. Couvercle de boíte (1) facile à ouvrir constitué d'un anneau de couvercle (2) produit par déformation d'une ébauche de tôle et découpage de la partie de tôle entourée de l'anneau de couvercle, et présentant à son bord extérieur un collet extérieur (6) servant à la réalisation d'un double pli (D) et, sur son bord intérieur, un rebord annulaire (5) formé par un enroulement (19) aplati et entourant une ouverture de couvercle, avec fixation au rebord annulaire, par scellement à chaud ou thermosoudage, d'une partie s'ouvrant par déchirement, caractérisé en ce que l'anneau de couvercle (2) est fabriqué à partir d'une ébauche de tôle pourvue d'un côté d'un revêtement (4) thermosoudable, que la partie s'ouvrant par déchirement ou partie ouvrante est formée par le morceau de tôle découpé (3) et que l'enroulement (19) est formé et aplati en rebord annulaire (5), de manière que l'ouverture définitive (11'') de la boíte soit plus petite que le morceau de tôle découpé (3) et que la zone marginale (3a) de ce morceau de tôle et le rebord annulaire (5) se recouvrent mutuellement.
  10. Couvercle de boíte selon la revendication 9, caractérisé en ce qu'un anneau d'ouverture (14) ou une languette d'ouverture présente une patte de fixation (15) et cette patte est reliée par thermosoudage, collage ou analogue à la zone marginale (3a) de la partie de tôle (3), sur le côté extérieur de celle-ci.
  11. Couvercle de boíte selon la revendication 10, caractérisé en ce qu'une ligne d'entailles (16), correspondant essentiellement au contour de la patte de fixation (15), est prévue sur le côté extérieur de la partie de tôle (3), ligne d'entailles qui s'étend jusqu'à proximité de la zone de recouvrement et de scellement du morceau de tôle découpé (3).
  12. Couvercle de boíte selon la revendication 10, caractérisé en ce que la patte de fixation (15) est repliée à 180° suivant une ligne de pliage (15a) et sa partie libre repliée (15b) est reliée, dans la zone marginale (3a) de la partie de tôle (3), au côté extérieur de celle-ci, de manière que la ligne de pliage (15a) soit située à proximité du bord extérieur (3b) du morceau de tôle découpé (3) et s'étende pour l'essentiel parallèlement à ce bord.
EP97106499A 1996-05-21 1997-04-19 Procédé de fabrication d'un couvercle de boíte à ouverture facile et couvercle de boíte à ouverture facile Expired - Lifetime EP0808676B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29609130U DE29609130U1 (de) 1996-05-21 1996-05-21 Leicht zu öffnender Dosendeckel
DE29609130U 1996-05-21

Publications (2)

Publication Number Publication Date
EP0808676A1 EP0808676A1 (fr) 1997-11-26
EP0808676B1 true EP0808676B1 (fr) 1999-11-24

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EP97106499A Expired - Lifetime EP0808676B1 (fr) 1996-05-21 1997-04-19 Procédé de fabrication d'un couvercle de boíte à ouverture facile et couvercle de boíte à ouverture facile

Country Status (11)

Country Link
US (2) US5913651A (fr)
EP (1) EP0808676B1 (fr)
AT (1) ATE186860T1 (fr)
CZ (1) CZ150097A3 (fr)
DE (2) DE29609130U1 (fr)
DK (1) DK0808676T3 (fr)
ES (1) ES2138847T3 (fr)
GR (1) GR3031937T3 (fr)
IL (1) IL120850A0 (fr)
PL (1) PL184235B1 (fr)
RU (1) RU2179489C2 (fr)

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US5069355A (en) * 1991-01-23 1991-12-03 Sonoco Products Company Easy-opening composite closure for hermetic sealing of a packaging container by double seaming
DE4332306A1 (de) * 1993-09-23 1995-03-30 Rasselstein Ag Verfahren zur Herstellung eines leicht zu öffnenden Dosendeckels aus Blech
GB2289663A (en) * 1994-05-21 1995-11-29 Metal Box Plc Containers and lids bonded thereto
US5752614A (en) * 1996-11-19 1998-05-19 Sonoco Products Company Easy-opening closure for hermetic sealing a retortable container

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GR3031937T3 (en) 2000-03-31
PL319960A1 (en) 1997-11-24
DK0808676T3 (da) 2000-03-27
US6036043A (en) 2000-03-14
CZ150097A3 (en) 1997-12-17
ATE186860T1 (de) 1999-12-15
US5913651A (en) 1999-06-22
DE59700744D1 (de) 1999-12-30
RU2179489C2 (ru) 2002-02-20
EP0808676A1 (fr) 1997-11-26
ES2138847T3 (es) 2000-01-16
PL184235B1 (pl) 2002-09-30
DE29609130U1 (de) 1997-09-18
IL120850A0 (en) 1997-09-30

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