EP0408268A2 - Method and apparatus for manufacturing a ring for a container closure - Google Patents
Method and apparatus for manufacturing a ring for a container closure Download PDFInfo
- Publication number
- EP0408268A2 EP0408268A2 EP90307427A EP90307427A EP0408268A2 EP 0408268 A2 EP0408268 A2 EP 0408268A2 EP 90307427 A EP90307427 A EP 90307427A EP 90307427 A EP90307427 A EP 90307427A EP 0408268 A2 EP0408268 A2 EP 0408268A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- annular
- diaphragm
- blank
- closure
- 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
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Classifications
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- 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
- B65D17/501—Flexible tape or foil-like material
- B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
-
- 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
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/001—Action for opening container
- B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/0058—Other details of container end panel
- B65D2517/0059—General cross-sectional shape of container end panel
- B65D2517/0061—U-shaped
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/0058—Other details of container end panel
- B65D2517/008—Materials of container end panel
- B65D2517/0082—Coated or laminated metal
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/0058—Other details of container end panel
- B65D2517/008—Materials of container end panel
- B65D2517/0085—Foil-like, e.g. paper or cardboard
- B65D2517/0086—Foil-like, e.g. paper or cardboard laminated
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
- B65D2517/5002—Details of flexible tape or foil-like material
- B65D2517/5013—Details of flexible tape or foil-like material the tape covering almost the whole of the container end panel
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
- B65D2517/5002—Details of flexible tape or foil-like material
- B65D2517/5024—Material
- B65D2517/5027—Single layer
- B65D2517/5029—Single layer and connected to container by local areas of adhesive
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
- B65D2517/504—Details of preformed openings
- B65D2517/5043—Details of preformed openings provided with a flange
- B65D2517/5051—Up-turned flange, i.e. extending away from container
- B65D2517/5054—Up-turned flange, i.e. extending away from container rolled or folded back, e.g. to avoid sharp edges
-
- 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
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
- B65D2517/5072—Details of hand grip, tear- or lift-tab
- B65D2517/5083—Details of hand grip, tear- or lift-tab with means facilitating initial lifting of tape, e.g. lift or pull-tabs
Definitions
- This invention relates to closures for cans or like containers, and more particularly to closures of a kind comprising a ring portion adapted for attachment to a container body and having a diaphragm sealingly fixed to the ring to complete the closure.
- British Patent No. 1274542 (Sandherr) describes containers having closures comprising a ring and a diaphragm adhered to the ring by an adhesive that permits peeling of the diaphragm from the ring to give access to the contents of the container.
- Sandherr provides a ring having a peripheral portion adapted for attachment to a container body, an annular plug portion extending from the peripheral portion to enter the container body, a flat annulus extending radially inwards from the plug portion and a frustoconical annulus depending from the interior of the flat annulus to terminate at the container body.
- the diaphragm is peripherally adhered to the flat annulus and spans the ring to serve as a closure removable by a peeling action. Whilst the frustoconical annulus serves to guide powder products out of the container, its terminal edge is inside the container and therefore at risk of corrosion by any aggressive substance packed in the container.
- Sandherr describes a ring having a peripheral portion, an annular plug, portion depending from the peripheral portion, a frustoconical annulus extending upwardly and inwardly from the annular plug portion and a flat annulus extending radially outwards from the frustoconical annulus.
- the diaphragm is adhered to the flat annulus, the free edge of which is at risk of atmospheric corrosion.
- British Patent No. 2022474B describes a process for making peripheral rings for the end of cans. These rings are cut from a lacquered sheet and formed with an inwardly extending portion whose inner part is turned back on itself away from the interior of the can to form an annular level flange overlying the outer part of the inwardly extending portion. A diaphragm with a tearback tab is bonded to this flange. In this case too, the cut edge of the ring is open to the atmosphere and thus at risk from atmospheric corrosion.
- EPA-A-090957 describes a closure in which the cut edge is folded back against a step in an annular portion of the ring.
- the folded back portion provides a bonding zone for the diaphragm, in addition to the bonding zone provided by the annular portion. The cut edge is thus sealed from the atmosphere.
- a method of manufacturing a supporting ring comprising:- supporting sheet metal on ah outer support of a lower die, said outer support providing a cutting edge; bringing a cooperating cutting edge into contact with the sheet metal to cut a blank from the metal and to hold the cut edge of the blank; punching a central aperture in the blank while urging the periphery of the blank into contact with stamping surfaces of the lower die thereby to commence formation of a stepped annular ledge terminating in an annular trough and an upstanding annular wall; and on completion of said formation, folding the upstanding annular wall so as to cause the free edge thereof to overlie the inner part of the stepped annular ledge.
- This method which involves the step of punching a central aperture while commencing formation of the periphery of the blank, enables a ring to be made in a simple procedure requiring only two forming operations.
- the central aperture is punched after wholly or partially forming the periphery of the blank
- the central aperture is punched while the periphery is being formed which provides the central upstanding wall without the need for further steps.
- metal can be drawn not only from the outer cut edge of the blank but also from the central cut edge. This reduces wastage of metal from the sheet from which the blank is cut.
- a method of manufacturing a closure comprises the additional step of bonding a diaphragm to the ring at concentric bonding zones presented by the outer part of the stepped annular ledge and the portion of the upstanding annular wall which has been folded to overlie the inner part of the stepped annular ledge.
- the diaphragm has a pull lug extending from its periphery and the bond at the bonding zones between the diaphragm and the ring permits removal of the diaphragm by a peeling action.
- the diaphragm may be bonded to the ring by adhesive.
- the diaphragm may be cut from a laminate of common metal and a polymeric film bonded by application of heat and pressure to the diaphragm to seal the diaphragm to the ring at the bonding zone.
- the ring may be stamped from a laminate of common metal and a polymeric film, or prelacquered common metal, and the diaphragm is bonded to said film or lacquered surfaces at the bonding zones.
- the diaphragm is cut from a laminate of aluminium and a polymeric film that will adhere to a receptive surface coating on a ring stamped from precoated tinplate or electrochrome coated steel (called TFS).
- the invention provides in another aspect apparatus for manufacturing a supporting ring for a container closure the apparatus comprising circular upper and lower dies having two sets of cooperating cutting edges, the sets being spaced apart radially so as to cut an annular blank from sheet metal supported by the lower die, and between said sets of cutting edges a set of cooperating stamping surfaces for stamping the annular blank to form a stepped annular ledge terminating in an upstanding annular wall and the lower die having a draw portion over which can be drawn the annular blank to form a peripheral formation.
- the invention also provides a closure for a can or like container comprising a ring for attachment to a container body, the ring comprising a peripheral formation adapted for engagement with a container body, and an annular flange portion extending radially inwardly from the peripheral formation to support a diaphragm bonded to the ring, wherein the annular flange portion comprises a level annular region and an annular curl extending inwardly from the level annular region and turned back on itself to define the opening of the ring and to overlie the level annular region and to present a bonding zone for the disphragm, the said level annular region being spaced radially from the peripheral formation by a second, outer annular region which is axially spaced from the inner annular region by a step portion so as to present an outer bonding zone for the diaphragm concentric with the first-mentioned, inner, bonding zone.
- a closure 1 comprises a ring 2 and a diaphragm 3 secured to the ring 2.
- the ring 2 is stamped from a common sheet metal such as tin plate or electrochrome coated steel (called TFS in the trade), typically of about 0.26mm thickness, or aluminium alloy sheet.
- TFS electrochrome coated steel
- the ring surfaces to which the diaphragm is adhered are coated with a protective coating such as an epoxy phenolic lacquer or other polymeric film.
- the diaphragm 3 has been cut from a thin sheet material such as an aluminium foil or laminate of aluminium foil/polymeric film or a laminate of polymeric films having suitable barrier properties.
- a printed paper layer may be included in the laminates to permit presentation of useful indicia.
- the rings may be made from prelacquered sheet metal or a laminate of sheet metal and a polymeric film. Particularly suitable laminates are those manufactured by CMB Foodcan plc under the Trade Mark METPOLAM.
- Figure 2 serves to show that the diaphragm 3 spans the ring 2 to which it is peripherally attached.
- the diaphragm has a pull tab 4 joining the periphery of the diaphragm at a fold line 4a.
- the pull tab is used to apply a peeling mode of force to remove the diaphragm 3 from the ring 2.
- FIG. 3 shows the ring 2 and its connection with the diaphragm 3 in more detail.
- the ring 2 comprises a peripheral formation adapted for engagement with a container body and including a flange 6, sometimes called a "cover hook", adapted for double seaming to a can body, an annular wall 7 depending from the inner periphery of the peripheral flange 6, and an annular flange portion extending radially inwards from the wall 7 to support the diaphragm 3.
- the annular flange portion comprises a first flat annulus 8 extending inwards from the chuck wall 7 and providing an outer annular region, a second flat annulus 9 surrounded by the first flat annulus 8 to provide an inner annular region and offset from said first flat annulus 8 by a step portion 10, and an annular curl 11 extending inwardly from the inner periphery of the second flat annulus 9 to turn back on itself to define the mouth of the ring and thereafter terminating as a third flat annulus 12 which lies over the second flat annulus 9.
- the diaphragm 3 is sealingly bonded by adhesive at an outer bond zone 5A to the upper surface of the first annulus 8 and by adhesive at an inner bond zone 5B to the upper surface of the third annulus 12 so that the free edge 112 of the third annulus 12 is totally enclosed from atmospheric or product attack.
- step portion 10 holds the second annulus 12 at a distance, measured at the central axis of the ring, of about one metal thickness so that the top surfaces of the first annulus 8 and third annulus 12 are substantially flush. Therefore, no bending of the diaphragm material is required to achieve a seal with both annulii.
- Various adhesives may be used at the bond zones 5A and 5B.
- a maleic anhydride modified polypropylene adhesive may be used.
- an adhesive such as polymers of acrylic resin could be used.
- the outer bond zone 5A is typically 1mm wide and the inner bond zone 5B is typically 2mm wide but these dimensions are not critical relative to each other.
- Figure 4 shows a second embodiment of the closure 13 in which a ring 14 has been stamped from a laminate of common sheet metal and a polymeric film on both major surfaces of the sheet metal.
- a laminate comprising an outer layer 15 of polypropylene a middle layer 16 of electrochrome coated steel and an inner layer 17 of polypropylene may be used.
- the diaphragm 3 could then be made of a laminate of polypropylene 18 and aluminium foil 19 which may be decorated or printed on the outside.
- Heat sealing of the layer 18 of the diaphragm and to the layer 15 of the ring is achieved by supporting the ring in a lower tool 20 and applying a heated tool 21 to the top surface of the diaphragm.
- the metal of the flat annulii 8, 9 and 12 is firmly supported to prevent any distortion of the diaphragm material.
- Alternative laminates include for example metal sheet and a film of polybutylene or polyethylene terephthalate.
- Figure 5 shows the closure 1 of Figures 1, 2 and 3 after attachment to a can body 22 by means of a double seam 23.
- the second embodiment of the closure, denoted 13 in Figure 4 can also be attached to a can body in like manner.
- the closure may be modified by provision of a modified peripheral flange to permit attachment to a container body 25, having a fibrous wall 27 made of spirally wound paperboard.
- Figure 6 shows such a modified closure 24 having a peripheral flange 26 crimped onto the fibrous wall 27.
- closures comprising a ring closed by a lever plug lid spanned by a diaphragm inside the container - usually held in place by the double seam.
- another embodiment of the invention provides, as shown in Figure 7, a closure 28 having a ring 29, a diaphragm 30 inside the container 31, and a plug lid 32 to serve as a useful reclosure after the diaphragm 30 has been cut open.
- the ring comprises a first flat annulus 8A, a second flat annulus 9A which is held outwardly offset from the first flat annulus 8A, and a third flat annulus 12A produced by an annular curl 11A as described above.
- the first annulus 8A is offset from the second annulus 9A so that the third flat annulus 12A and first flat annulus present flush surfaces to the diaphragm 30 for adhesion or fusion as discussed above.
- This embodiment differs from those described above in that the annular curl 11A is upstanding above the diaphragm 30 which is then secured to the underside of the annuli 8A, 12A.
- Figure 8a shows a tool set 40 comprising upper and lower dies 42, 44 for manufacturing a ring as described above.
- the upper die 42 comprises a component providing an annular cutting punch 60, a stamping punch 64 and a central cutting punch 66.
- a holding ring 62 is moveable relative to this component and is located between the cutting punch 60 and stamping punch 64.
- the lower die 44 comprises an outer cutting ring 68, an annular trough 70, a draw die 72, a stamping die 74 and an inner cutting ring 76.
- the tool also comprises a spring loaded support 61 against which bears the cutting punch 60.
- Figure 8a shows the first tool set 40 comprising upper and lower dies 42, 44.
- the lower die supports on its outer and inner cutting rings 68, 76 a metal sheet 46 which is to form the ring of the closure.
- the annular cutting punch 60 bears against the spring loaded support member 61 and cooperates with the outer cutting ring 68 to cut the outer edge of the blank which is to form the ring.
- the cut edge is held between the punch 60 and the support member 61 and is drawn over the draw die 72 to form the peripheral flange 6.
- the stamping punch 64 has an inner annular portion 65 which bears against the metal sheet 46 as the inner cutting ring 76 cooperates with the central punch 66 to cut an annular blank from the metal sheet ( Figure 8b). In this way, formation of the blank periphery commences.
- the central part 48 is discarded.
- the upper die 42 is lowered further as shown in Figure 8c so that the sheet metal is in contact with salient surfaces of the stamping punch 64 and stamping die 74.
- the annular cutting punch 60 and stamping punch 66 are lowered still further so that the stamping punch forms with the stamping die 74 by stamping from the annular blank a component having a peripheral channel (which will form the peripheral flange 6 of the ring), an annular wall 7 depending from the peripheral flange 6, a stepped annular ledge providing the first and second annuli 8, 9 and the step portion 10 and a trough portion 11 which supports an upstanding central annular wall 12.
- Peripheral restraint arises at the bend radii of the peripheral face of the draw die 72 and of the cutting ring 76 which cuts the blank.
- the blank is cut prior to any shape forming steps.
- the holding ring 62 is then sprung downwardly to release the shaped annular blank from the upper tool 42.
- the shaped annular blank is then transferred to a second tool set as shown in Figure 8e.
- the lower tool takes the same form as the lower tool of the first tool set but the upper tool comprises a central punch 56 and a holding ring 62.
- the peripheral flange portion 6 is held between the holding ring 62 and the draw die 72.
- a central punch 56 enters the annular wall 12 to fold that wall to form an outwardly directed curl 11 of which the raw edge terminates at the step portion 10.
- a diaphragm is bonded to the annular blank by heat sealing.
- Figure 9 illustrates how the curl 11 may terminate in a portion at a slight angle A to the surface of the step portion 10.
- the material for the diaphragm is chosen to tolerate stretch to drape over the angled portion of the curl.
- Figure 10 shows how the diaphragm 3 may be reinforced against abuse by bonding thereto the central part 48 cut during manufacture of the ring 2 with its periphery having been curled.
- the curl is continuous, thus minimising the strain within the metal as it is formed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
Description
- This invention relates to closures for cans or like containers, and more particularly to closures of a kind comprising a ring portion adapted for attachment to a container body and having a diaphragm sealingly fixed to the ring to complete the closure.
- British Patent No. 1274542 (Sandherr) describes containers having closures comprising a ring and a diaphragm adhered to the ring by an adhesive that permits peeling of the diaphragm from the ring to give access to the contents of the container. In one embodiment Sandherr provides a ring having a peripheral portion adapted for attachment to a container body, an annular plug portion extending from the peripheral portion to enter the container body, a flat annulus extending radially inwards from the plug portion and a frustoconical annulus depending from the interior of the flat annulus to terminate at the container body. The diaphragm is peripherally adhered to the flat annulus and spans the ring to serve as a closure removable by a peeling action. Whilst the frustoconical annulus serves to guide powder products out of the container, its terminal edge is inside the container and therefore at risk of corrosion by any aggressive substance packed in the container.
- In a second embodiment Sandherr describes a ring having a peripheral portion, an annular plug, portion depending from the peripheral portion, a frustoconical annulus extending upwardly and inwardly from the annular plug portion and a flat annulus extending radially outwards from the frustoconical annulus. The diaphragm is adhered to the flat annulus, the free edge of which is at risk of atmospheric corrosion.
- British Patent No. 2022474B describes a process for making peripheral rings for the end of cans. These rings are cut from a lacquered sheet and formed with an inwardly extending portion whose inner part is turned back on itself away from the interior of the can to form an annular level flange overlying the outer part of the inwardly extending portion. A diaphragm with a tearback tab is bonded to this flange. In this case too, the cut edge of the ring is open to the atmosphere and thus at risk from atmospheric corrosion.
- EPA-A-090957 describes a closure in which the cut edge is folded back against a step in an annular portion of the ring. The folded back portion provides a bonding zone for the diaphragm, in addition to the bonding zone provided by the annular portion. The cut edge is thus sealed from the atmosphere.
- Apart from providing a closure for a can which does not have cut edges open to the atmosphere, there is a need to provide a closure in which the diaphragm is sealed to the ring by a bond which can withstand the temperatures (up to 135°C and typically 121°C) required to pasteurise products sealed within the can.
- It would be desirable to produce such a closure simply and in a cost effective manner.
- According to one aspect of the present invention there is provided a method of manufacturing a supporting ring comprising:-
supporting sheet metal on ah outer support of a lower die, said outer support providing a cutting edge;
bringing a cooperating cutting edge into contact with the sheet metal to cut a blank from the metal and to hold the cut edge of the blank;
punching a central aperture in the blank while urging the periphery of the blank into contact with stamping surfaces of the lower die thereby to commence formation of a stepped annular ledge terminating in an annular trough and an upstanding annular wall; and
on completion of said formation, folding the upstanding annular wall so as to cause the free edge thereof to overlie the inner part of the stepped annular ledge. - This method, which involves the step of punching a central aperture while commencing formation of the periphery of the blank, enables a ring to be made in a simple procedure requiring only two forming operations. In contrast to earlier methods, where the central aperture is punched after wholly or partially forming the periphery of the blank, in the present invention the central aperture is punched while the periphery is being formed which provides the central upstanding wall without the need for further steps. Furthermore, in subsequent forming of the periphery to completion, metal can be drawn not only from the outer cut edge of the blank but also from the central cut edge. This reduces wastage of metal from the sheet from which the blank is cut.
- A method of manufacturing a closure comprises the additional step of bonding a diaphragm to the ring at concentric bonding zones presented by the outer part of the stepped annular ledge and the portion of the upstanding annular wall which has been folded to overlie the inner part of the stepped annular ledge.
- If desired, the diaphragm has a pull lug extending from its periphery and the bond at the bonding zones between the diaphragm and the ring permits removal of the diaphragm by a peeling action. The diaphragm may be bonded to the ring by adhesive. Alternatively, the diaphragm may be cut from a laminate of common metal and a polymeric film bonded by application of heat and pressure to the diaphragm to seal the diaphragm to the ring at the bonding zone.
- In another case, the ring may be stamped from a laminate of common metal and a polymeric film, or prelacquered common metal, and the diaphragm is bonded to said film or lacquered surfaces at the bonding zones. Preferably, the diaphragm is cut from a laminate of aluminium and a polymeric film that will adhere to a receptive surface coating on a ring stamped from precoated tinplate or electrochrome coated steel (called TFS).
- The invention provides in another aspect apparatus for manufacturing a supporting ring for a container closure the apparatus comprising circular upper and lower dies having two sets of cooperating cutting edges, the sets being spaced apart radially so as to cut an annular blank from sheet metal supported by the lower die, and between said sets of cutting edges a set of cooperating stamping surfaces for stamping the annular blank to form a stepped annular ledge terminating in an upstanding annular wall and the lower die having a draw portion over which can be drawn the annular blank to form a peripheral formation.
- The invention also provides a closure for a can or like container comprising a ring for attachment to a container body, the ring comprising a peripheral formation adapted for engagement with a container body, and an annular flange portion extending radially inwardly from the peripheral formation to support a diaphragm bonded to the ring, wherein the annular flange portion comprises a level annular region and an annular curl extending inwardly from the level annular region and turned back on itself to define the opening of the ring and to overlie the level annular region and to present a bonding zone for the disphragm, the said level annular region being spaced radially from the peripheral formation by a second, outer annular region which is axially spaced from the inner annular region by a step portion so as to present an outer bonding zone for the diaphragm concentric with the first-mentioned, inner, bonding zone.
- For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which:-
- Figure 1 is a plan view of a closure comprising a ring and a diaphragm;
- Figure 2 is a sectional view of the closure of Figure 1 on line II-II in Figure 1;
- Figure 3 is an enlarged fragmentary section through the closure of Figures 1 and 2;
- Figure 4 is an enlarged fragmentary section through a second embodiment of the closure, also showing heat sealing tools;
- Figure 5 is an enlarged fragmentary section through the ring of Figures 1 to 3 after double seaming to a metal container body;
- Figure 6 is an enlarged fragmentary section through a third embodiment of the ring after attachment to a container body of spirally wound paperboard;
- Figure 7 is an enlarged fragmentary section through a fourth embodiment of the ring when double seamed to a container and closed by a diaphragm inside the container and covered by a replaceable plug lid;
- Figures 8a to 8f show apparatus for manufacturing closures;
- Figure 9 is an enlarged fragmentary section of the annular flange portion of the ring during manufacture of the closure;
- Figure 10 is a cross section through a closure in which the diaphragm is reinforced; and
- Figure 11 shows a section through the ring, illustrating the curl dimensions.
- Referring to Figure 1, a
closure 1 comprises aring 2 and adiaphragm 3 secured to thering 2. Thering 2 is stamped from a common sheet metal such as tin plate or electrochrome coated steel (called TFS in the trade), typically of about 0.26mm thickness, or aluminium alloy sheet. Preferably, the ring surfaces to which the diaphragm is adhered are coated with a protective coating such as an epoxy phenolic lacquer or other polymeric film. - The
diaphragm 3 has been cut from a thin sheet material such as an aluminium foil or laminate of aluminium foil/polymeric film or a laminate of polymeric films having suitable barrier properties. A printed paper layer may be included in the laminates to permit presentation of useful indicia. The rings may be made from prelacquered sheet metal or a laminate of sheet metal and a polymeric film. Particularly suitable laminates are those manufactured by CMB Foodcan plc under the Trade Mark METPOLAM. The following combinations of materials are appropriate:Ring Coating Diaphragm Internal External Substrate Coating (film) PP laminate PP laminate Aluminium EVA " " " HDPE " PET Aluminium Heat seal lacquer Epoxy phenolic with PP dispersion Epoxy phenolic with PP dispersion " EVA " " " PP Copolymer PP dispersion lacquer PP dispersion lacquer " " Any of above Any of above " Polybutylene PET PET Aluminium Heat seal lacquer - Figure 2 serves to show that the
diaphragm 3 spans thering 2 to which it is peripherally attached. As shown in Figures 1 and 2 the diaphragm has a pull tab 4 joining the periphery of the diaphragm at a fold line 4a. The pull tab is used to apply a peeling mode of force to remove thediaphragm 3 from thering 2. - Figure 3 shows the
ring 2 and its connection with thediaphragm 3 in more detail. Thering 2 comprises a peripheral formation adapted for engagement with a container body and including aflange 6, sometimes called a "cover hook", adapted for double seaming to a can body, anannular wall 7 depending from the inner periphery of theperipheral flange 6, and an annular flange portion extending radially inwards from thewall 7 to support thediaphragm 3. The annular flange portion comprises a firstflat annulus 8 extending inwards from thechuck wall 7 and providing an outer annular region, a secondflat annulus 9 surrounded by the firstflat annulus 8 to provide an inner annular region and offset from said firstflat annulus 8 by astep portion 10, and an annular curl 11 extending inwardly from the inner periphery of the secondflat annulus 9 to turn back on itself to define the mouth of the ring and thereafter terminating as a thirdflat annulus 12 which lies over the secondflat annulus 9. Thediaphragm 3 is sealingly bonded by adhesive at an outer bond zone 5A to the upper surface of thefirst annulus 8 and by adhesive at aninner bond zone 5B to the upper surface of thethird annulus 12 so that thefree edge 112 of thethird annulus 12 is totally enclosed from atmospheric or product attack. - In Figure 3 it can be seen that the
step portion 10 holds thesecond annulus 12 at a distance, measured at the central axis of the ring, of about one metal thickness so that the top surfaces of thefirst annulus 8 andthird annulus 12 are substantially flush. Therefore, no bending of the diaphragm material is required to achieve a seal with both annulii. - Various adhesives may be used at the
bond zones 5A and 5B. For example, if a strong bond is required, a maleic anhydride modified polypropylene adhesive may be used. If however, a peel bond is required, an adhesive such as polymers of acrylic resin could be used. The outer bond zone 5A is typically 1mm wide and theinner bond zone 5B is typically 2mm wide but these dimensions are not critical relative to each other. - Figure 4 shows a second embodiment of the
closure 13 in which a ring 14 has been stamped from a laminate of common sheet metal and a polymeric film on both major surfaces of the sheet metal. For example, a laminate comprising an outer layer 15 of polypropylene a middle layer 16 of electrochrome coated steel and an inner layer 17 of polypropylene may be used. Thediaphragm 3 could then be made of a laminate ofpolypropylene 18 andaluminium foil 19 which may be decorated or printed on the outside. Heat sealing of thelayer 18 of the diaphragm and to the layer 15 of the ring is achieved by supporting the ring in alower tool 20 and applying a heated tool 21 to the top surface of the diaphragm. It will be noticed that the metal of theflat annulii - Figure 5 shows the
closure 1 of Figures 1, 2 and 3 after attachment to acan body 22 by means of adouble seam 23. The second embodiment of the closure, denoted 13 in Figure 4, can also be attached to a can body in like manner. - However, as shown in Figure 6 the closure may be modified by provision of a modified peripheral flange to permit attachment to a
container body 25, having afibrous wall 27 made of spirally wound paperboard. Figure 6 shows such a modifiedclosure 24 having aperipheral flange 26 crimped onto thefibrous wall 27. - It is intended that the embodiment described in Figures 1 to 5 will be used primarily on containers used for packing aseptically packed products or thermally processed paste-like substances such as pate or dog food. The diaphragm serves as a primary hermetic seal to the container.
- However, it is traditional in the packing of dry goods, such as gravy granules or milk powders to use closures comprising a ring closed by a lever plug lid spanned by a diaphragm inside the container - usually held in place by the double seam. To this end, another embodiment of the invention provides, as shown in Figure 7, a closure 28 having a
ring 29, a diaphragm 30 inside thecontainer 31, and aplug lid 32 to serve as a useful reclosure after the diaphragm 30 has been cut open. In Figure 7 the ring comprises a firstflat annulus 8A, a secondflat annulus 9A which is held outwardly offset from the firstflat annulus 8A, and a thirdflat annulus 12A produced by an annular curl 11A as described above. Thefirst annulus 8A is offset from thesecond annulus 9A so that the thirdflat annulus 12A and first flat annulus present flush surfaces to the diaphragm 30 for adhesion or fusion as discussed above. This embodiment differs from those described above in that the annular curl 11A is upstanding above the diaphragm 30 which is then secured to the underside of theannuli - Figure 8a shows a tool set 40 comprising upper and lower dies 42, 44 for manufacturing a ring as described above. The
upper die 42 comprises a component providing anannular cutting punch 60, a stampingpunch 64 and acentral cutting punch 66. A holdingring 62 is moveable relative to this component and is located between the cuttingpunch 60 and stampingpunch 64. Thelower die 44 comprises anouter cutting ring 68, anannular trough 70, a draw die 72, a stampingdie 74 and aninner cutting ring 76. The tool also comprises a spring loaded support 61 against which bears the cuttingpunch 60. - Reference will now be made to Figures 8a to 8f to describe a process for manufacturing a closure as described above. Figure 8a shows the first tool set 40 comprising upper and lower dies 42, 44. The lower die supports on its outer and inner cutting rings 68, 76 a
metal sheet 46 which is to form the ring of the closure. As the upper die is lowered theannular cutting punch 60 bears against the spring loaded support member 61 and cooperates with theouter cutting ring 68 to cut the outer edge of the blank which is to form the ring. The cut edge is held between thepunch 60 and the support member 61 and is drawn over the draw die 72 to form theperipheral flange 6. The stampingpunch 64 has an inner annular portion 65 which bears against themetal sheet 46 as theinner cutting ring 76 cooperates with thecentral punch 66 to cut an annular blank from the metal sheet (Figure 8b). In this way, formation of the blank periphery commences. Thecentral part 48 is discarded. Theupper die 42 is lowered further as shown in Figure 8c so that the sheet metal is in contact with salient surfaces of the stampingpunch 64 and stamping die 74. Theannular cutting punch 60 and stampingpunch 66 are lowered still further so that the stamping punch forms with the stamping die 74 by stamping from the annular blank a component having a peripheral channel (which will form theperipheral flange 6 of the ring), anannular wall 7 depending from theperipheral flange 6, a stepped annular ledge providing the first andsecond annuli step portion 10 and a trough portion 11 which supports an upstanding centralannular wall 12. Although this has been described as a series of steps occurring gradually, in practice the above described process is carried out in a single punch operation of theupper tool 42, taking no more than 0.2s. The first tool set applies initially no holding restraint for the annular blank. Peripheral restraint arises at the bend radii of the peripheral face of the draw die 72 and of the cuttingring 76 which cuts the blank. Also, in contrast to known ring manufacturing methods, the blank is cut prior to any shape forming steps. The holdingring 62 is then sprung downwardly to release the shaped annular blank from theupper tool 42. The shaped annular blank is then transferred to a second tool set as shown in Figure 8e. The lower tool takes the same form as the lower tool of the first tool set but the upper tool comprises acentral punch 56 and a holdingring 62. As shown in Figure 8e, theperipheral flange portion 6 is held between the holdingring 62 and the draw die 72. Acentral punch 56 enters theannular wall 12 to fold that wall to form an outwardly directed curl 11 of which the raw edge terminates at thestep portion 10. Finally a diaphragm is bonded to the annular blank by heat sealing. - Figure 9 illustrates how the curl 11 may terminate in a portion at a slight angle A to the surface of the
step portion 10. In this case the material for the diaphragm is chosen to tolerate stretch to drape over the angled portion of the curl. - Finally, Figure 10 shows how the
diaphragm 3 may be reinforced against abuse by bonding thereto thecentral part 48 cut during manufacture of thering 2 with its periphery having been curled. - Figure 11 illustrates the curl radii, where r₁ = r₂ = 1.2mm and r₃ = 0.6mm. The curl is continuous, thus minimising the strain within the metal as it is formed.
Claims (9)
supporting sheet metal on an outer support of a lower die, said outer support providing a cutting edge;
bringing a cooperating cutting edge into contact with the sheet metal to cut a blank from the metal and to hold the cut edge of the blank;
punching a central aperture in the blank while urging the periphery of the blank into contact with stamping surfaces of the lower die thereby to commence formation of a stepped annular ledge terminating in an annular trough and an upstanding annular wall; and
on completion of said formation, folding the upstanding annular wall so as to cause the free edge thereof to overlie the inner part of the stepped annular ledge.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90307427T ATE100405T1 (en) | 1989-07-10 | 1990-07-06 | METHOD AND APPARATUS FOR MANUFACTURING A RING FOR A CONTAINER CLOSURE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8915787 | 1989-07-10 | ||
GB8915787A GB2237259B (en) | 1989-07-10 | 1989-07-10 | Container closure |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0408268A2 true EP0408268A2 (en) | 1991-01-16 |
EP0408268A3 EP0408268A3 (en) | 1991-03-20 |
EP0408268B1 EP0408268B1 (en) | 1994-01-19 |
Family
ID=10659815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90307427A Revoked EP0408268B1 (en) | 1989-07-10 | 1990-07-06 | Method and apparatus for manufacturing a ring for a container closure |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0408268B1 (en) |
AP (1) | AP168A (en) |
AT (1) | ATE100405T1 (en) |
DE (1) | DE69006124T2 (en) |
GB (1) | GB2237259B (en) |
ZA (1) | ZA905378B (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
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DE4106110A1 (en) * | 1990-05-23 | 1991-11-28 | Zuechner Blechwaren | Metal container sealable rim |
FR2673911A1 (en) * | 1991-03-12 | 1992-09-18 | Cmb Packaging Sa | Package with cover |
AU650788B2 (en) * | 1992-09-29 | 1994-06-30 | Tenryu Chemical Industry Co., Ltd. | Lid device for wide-mouthed container and method for making the same |
AU652665B2 (en) * | 1991-10-02 | 1994-09-01 | Hokkai Can Co. Ltd. | Openable container lid |
EP0683110A1 (en) * | 1994-05-21 | 1995-11-22 | CarnaudMetalbox plc | Container-lid combination |
WO1997004896A1 (en) * | 1995-07-26 | 1997-02-13 | Vaw Aluminium Ag | Method of manufacturing a container for preserves |
EP0775074A1 (en) * | 1994-08-24 | 1997-05-28 | Polystar Packaging Incorporated | Container and closure with in-turned seam |
WO1997049510A1 (en) * | 1996-06-24 | 1997-12-31 | Impress Metal Packaging Gmbh & Co. Ohg | Production of lid bordering rings without round cuttings |
WO1998045067A1 (en) * | 1997-04-10 | 1998-10-15 | Alcan Rorschach Ag | Method for the production of a lock ring and lock ring thus produced |
WO2001007330A1 (en) * | 1999-07-22 | 2001-02-01 | Alcan Rorschach Ag | Sealing ring, comprising a sealing diaphragm and production of the same |
WO2002079041A1 (en) * | 2001-03-29 | 2002-10-10 | Industrias Alimentarias De Navarra, S.A. | Closure means for cans, especially preserved food cans |
EP1419972A2 (en) * | 2002-11-12 | 2004-05-19 | Sonoco Development, Inc. | Easy-opening closure for retortable container |
DE10338445A1 (en) * | 2003-08-19 | 2005-03-31 | Impress Group B.V. | Cover ring with inclined flat bar |
ES2237325A1 (en) * | 2001-03-29 | 2005-07-16 | Industrias Alimentarias De Navarra, S.A. | Closure means for cans, especially preserved food cans |
WO2006053457A2 (en) * | 2004-11-19 | 2006-05-26 | Soudronic Ag | Sealing machine |
EP1747826A1 (en) * | 2005-07-27 | 2007-01-31 | Alcan Technology & Management Ltd. | Cover ring for a can lid and method for manufacturing the same |
EP1878666A1 (en) * | 2006-07-13 | 2008-01-16 | Impress Metal Packaging SA | Container lid equipped with a peelable membrane. |
EP2184237A1 (en) * | 2008-11-10 | 2010-05-12 | Crown Packaging Technology, Inc | A closure for a container and a method for forming the same |
WO2010094780A1 (en) * | 2009-02-20 | 2010-08-26 | Crown Packaging Technology, Inc. | Metal end panel with hole |
CH705595A1 (en) * | 2011-10-05 | 2013-04-15 | Soudronic Ag | Manufacturing method for tear-open lids, involves providing lid ring blank, which has beading and flange adjoined to beading flank, where flange with cutting edge borders opening of lid ring blank |
US20150158655A1 (en) * | 2013-12-10 | 2015-06-11 | P.T. Toba Surimi Industries | Packaged Crabmeat Product |
EP1802462B2 (en) † | 2004-10-19 | 2018-05-30 | Amcor Flexibles Sélestat SAS | Metalloplastic multilayered packaging film |
WO2019077004A1 (en) * | 2017-10-20 | 2019-04-25 | Ardagh Mp Group Netherlands B.V. | Lid for a metal can, comprising a metal ring and a peelable, heat-sealed membrane |
CN110900675A (en) * | 2019-12-20 | 2020-03-24 | 昆山派胜智能科技有限公司 | Aluminum foil cutting device and method |
US20200346831A1 (en) * | 2017-12-07 | 2020-11-05 | Nippon Steel Corporation | Heat sealed lid and can |
US20220033136A1 (en) * | 2019-02-07 | 2022-02-03 | Nippon Steel Corporation | Can lid made of resin laminate steel sheet for resin-metal composite container, can bottom made of resin laminate steel sheet for resin-metal composite container, and resin-metal composite container |
CN116586530A (en) * | 2023-07-11 | 2023-08-15 | 廊坊军兴溢美包装制品有限公司 | Manufacturing method of easy-to-tear cover |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US5752614A (en) * | 1996-11-19 | 1998-05-19 | Sonoco Products Company | Easy-opening closure for hermetic sealing a retortable container |
WO2006097005A1 (en) * | 2005-03-17 | 2006-09-21 | Soudronic Ag | Tear-off lid and method for production thereof |
DE102006005058A1 (en) | 2006-02-03 | 2007-08-16 | IMPRESS Metal Packaging S.A., Crosmières | Expandable lid for a food can |
EP2248731A1 (en) | 2009-05-07 | 2010-11-10 | Crown Packaging Technology, Inc | Container with clamped seal |
CN107253560A (en) * | 2017-04-28 | 2017-10-17 | 浙江青莲食品股份有限公司 | Food cans lid and food cans |
CN111301853B (en) * | 2020-04-09 | 2021-12-24 | 广东中瑞制罐有限公司 | Cover body for pouring out granular materials, packing material and granular material container |
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EP0090957A2 (en) * | 1982-04-05 | 1983-10-12 | Sandherr Packungen AG | Closure for sterilisable containers |
US4547305A (en) * | 1982-07-22 | 1985-10-15 | Lever Brothers Company | Low temperature bleaching detergent compositions comprising peracids and persalt activator |
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US2821326A (en) * | 1955-05-12 | 1958-01-28 | Fried Louis | Receptacles and opening means therefor |
DE1145949B (en) * | 1957-03-28 | 1963-03-21 | Louis Fried | Containers, in particular cans for beverages, and process for their manufacture |
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GB1536543A (en) * | 1975-01-13 | 1978-12-20 | Metal Box Co Ltd | Containers |
SE453822B (en) * | 1985-08-16 | 1988-03-07 | Plm Ab | CONTAINER WITH TWO LIDS |
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- 1989-07-10 GB GB8915787A patent/GB2237259B/en not_active Expired - Fee Related
-
1990
- 1990-07-06 DE DE69006124T patent/DE69006124T2/en not_active Revoked
- 1990-07-06 AT AT90307427T patent/ATE100405T1/en not_active IP Right Cessation
- 1990-07-06 EP EP90307427A patent/EP0408268B1/en not_active Revoked
- 1990-07-09 ZA ZA905378A patent/ZA905378B/en unknown
- 1990-07-09 AP APAP/P/1990/000191A patent/AP168A/en active
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CH475136A (en) * | 1968-07-11 | 1969-07-15 | Albis Pack Ag | Can with a detachable sealing membrane |
US3868919A (en) * | 1973-12-06 | 1975-03-04 | Aluminum Co Of America | Method and apparatus for forming easy opening container walls |
GB2022474A (en) * | 1978-06-06 | 1979-12-19 | Alusuisse | Manufacture of colosure rings for can ends |
EP0090957A2 (en) * | 1982-04-05 | 1983-10-12 | Sandherr Packungen AG | Closure for sterilisable containers |
US4547305A (en) * | 1982-07-22 | 1985-10-15 | Lever Brothers Company | Low temperature bleaching detergent compositions comprising peracids and persalt activator |
Cited By (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4106110A1 (en) * | 1990-05-23 | 1991-11-28 | Zuechner Blechwaren | Metal container sealable rim |
FR2673911A1 (en) * | 1991-03-12 | 1992-09-18 | Cmb Packaging Sa | Package with cover |
AU652665B2 (en) * | 1991-10-02 | 1994-09-01 | Hokkai Can Co. Ltd. | Openable container lid |
AU650788B2 (en) * | 1992-09-29 | 1994-06-30 | Tenryu Chemical Industry Co., Ltd. | Lid device for wide-mouthed container and method for making the same |
US5725120A (en) * | 1994-05-21 | 1998-03-10 | Carnaudmetalbox (Holdings) Usa, Inc. | Containers |
EP0683110A1 (en) * | 1994-05-21 | 1995-11-22 | CarnaudMetalbox plc | Container-lid combination |
EP0775074A1 (en) * | 1994-08-24 | 1997-05-28 | Polystar Packaging Incorporated | Container and closure with in-turned seam |
EP0775074A4 (en) * | 1994-08-24 | 1997-12-29 | Polystar Packaging Inc | Container and closure with in-turned seam |
WO1997004896A1 (en) * | 1995-07-26 | 1997-02-13 | Vaw Aluminium Ag | Method of manufacturing a container for preserves |
WO1997049510A1 (en) * | 1996-06-24 | 1997-12-31 | Impress Metal Packaging Gmbh & Co. Ohg | Production of lid bordering rings without round cuttings |
EP1029613A1 (en) * | 1996-06-24 | 2000-08-23 | Impress GmbH & Co. oHG | Making cover rings from blanks without loss of material |
WO1998045067A1 (en) * | 1997-04-10 | 1998-10-15 | Alcan Rorschach Ag | Method for the production of a lock ring and lock ring thus produced |
WO2001007330A1 (en) * | 1999-07-22 | 2001-02-01 | Alcan Rorschach Ag | Sealing ring, comprising a sealing diaphragm and production of the same |
WO2002079041A1 (en) * | 2001-03-29 | 2002-10-10 | Industrias Alimentarias De Navarra, S.A. | Closure means for cans, especially preserved food cans |
ES2237325A1 (en) * | 2001-03-29 | 2005-07-16 | Industrias Alimentarias De Navarra, S.A. | Closure means for cans, especially preserved food cans |
EP1419972A2 (en) * | 2002-11-12 | 2004-05-19 | Sonoco Development, Inc. | Easy-opening closure for retortable container |
EP1419972A3 (en) * | 2002-11-12 | 2004-07-07 | Sonoco Development, Inc. | Easy-opening closure for retortable container |
US7055713B2 (en) | 2002-11-12 | 2006-06-06 | Sonoco Development, Inc. | Easy-opening closure for retortable container |
DE10338445B4 (en) * | 2003-08-19 | 2007-02-08 | IMPRESS Metal Packaging S.A., Crosmières | Cover ring with inclined flat bar |
EP2332849A1 (en) | 2003-08-19 | 2011-06-15 | Impress Metal Packaging S.A. | Cover ring having a slanted part and manufacturing process |
DE10338445A1 (en) * | 2003-08-19 | 2005-03-31 | Impress Group B.V. | Cover ring with inclined flat bar |
EP1802462B2 (en) † | 2004-10-19 | 2018-05-30 | Amcor Flexibles Sélestat SAS | Metalloplastic multilayered packaging film |
WO2006053457A3 (en) * | 2004-11-19 | 2006-08-10 | Elpatronic Ag | Sealing machine |
WO2006053457A2 (en) * | 2004-11-19 | 2006-05-26 | Soudronic Ag | Sealing machine |
EP1747826A1 (en) * | 2005-07-27 | 2007-01-31 | Alcan Technology & Management Ltd. | Cover ring for a can lid and method for manufacturing the same |
EP1878666A1 (en) * | 2006-07-13 | 2008-01-16 | Impress Metal Packaging SA | Container lid equipped with a peelable membrane. |
EP2184237A1 (en) * | 2008-11-10 | 2010-05-12 | Crown Packaging Technology, Inc | A closure for a container and a method for forming the same |
WO2010052249A2 (en) * | 2008-11-10 | 2010-05-14 | Crown Packaging Technology, Inc. | Bimetallic corrosion mitigation |
WO2010052249A3 (en) * | 2008-11-10 | 2010-09-23 | Crown Packaging Technology, Inc. | A closure for a container and a method for forming the same |
US8807374B2 (en) | 2008-11-10 | 2014-08-19 | Crown Packaging Technology, Inc. | Bimetallic corrosion mitigation |
WO2010094780A1 (en) * | 2009-02-20 | 2010-08-26 | Crown Packaging Technology, Inc. | Metal end panel with hole |
CH705595A1 (en) * | 2011-10-05 | 2013-04-15 | Soudronic Ag | Manufacturing method for tear-open lids, involves providing lid ring blank, which has beading and flange adjoined to beading flank, where flange with cutting edge borders opening of lid ring blank |
US20150158655A1 (en) * | 2013-12-10 | 2015-06-11 | P.T. Toba Surimi Industries | Packaged Crabmeat Product |
JP2020537615A (en) * | 2017-10-20 | 2020-12-24 | トリビウム パッケイジング グループ ネザーランズ べー.ヴィー | Lid for metal cans with metal ring and removable heat-sealed membrane |
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EP3722226A4 (en) * | 2017-12-07 | 2021-08-11 | Nippon Steel Corporation | Heat-seal lid and can |
US20200346831A1 (en) * | 2017-12-07 | 2020-11-05 | Nippon Steel Corporation | Heat sealed lid and can |
US11697539B2 (en) * | 2017-12-07 | 2023-07-11 | Nippon Steel Corporation | Heat sealed lid and can |
US20220033136A1 (en) * | 2019-02-07 | 2022-02-03 | Nippon Steel Corporation | Can lid made of resin laminate steel sheet for resin-metal composite container, can bottom made of resin laminate steel sheet for resin-metal composite container, and resin-metal composite container |
US12030702B2 (en) * | 2019-02-07 | 2024-07-09 | Nippon Steel Corporation | Can lid made of resin laminate steel sheet for resin-metal composite container, can bottom made of resin laminate steel sheet for resin-metal composite container, and resin-metal composite container |
CN110900675A (en) * | 2019-12-20 | 2020-03-24 | 昆山派胜智能科技有限公司 | Aluminum foil cutting device and method |
CN110900675B (en) * | 2019-12-20 | 2023-06-20 | 昆山派胜智能科技有限公司 | Aluminum foil cutting device and method |
CN116586530A (en) * | 2023-07-11 | 2023-08-15 | 廊坊军兴溢美包装制品有限公司 | Manufacturing method of easy-to-tear cover |
Also Published As
Publication number | Publication date |
---|---|
DE69006124T2 (en) | 1994-05-26 |
EP0408268B1 (en) | 1994-01-19 |
DE69006124D1 (en) | 1994-03-03 |
GB2237259A (en) | 1991-05-01 |
EP0408268A3 (en) | 1991-03-20 |
ATE100405T1 (en) | 1994-02-15 |
GB8915787D0 (en) | 1989-08-31 |
AP9000191A0 (en) | 1990-07-31 |
AP168A (en) | 1992-01-23 |
GB2237259B (en) | 1993-12-08 |
ZA905378B (en) | 1991-04-24 |
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