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WO2007071682A1 - Corps de boite dote d’un rebord ou d’un gradin sur lequel est depose un produit d’etancheite, et son procede de fabrication - Google Patents

Corps de boite dote d’un rebord ou d’un gradin sur lequel est depose un produit d’etancheite, et son procede de fabrication Download PDF

Info

Publication number
WO2007071682A1
WO2007071682A1 PCT/EP2006/069926 EP2006069926W WO2007071682A1 WO 2007071682 A1 WO2007071682 A1 WO 2007071682A1 EP 2006069926 W EP2006069926 W EP 2006069926W WO 2007071682 A1 WO2007071682 A1 WO 2007071682A1
Authority
WO
WIPO (PCT)
Prior art keywords
closure
sidewall
pliable material
forming
seat
Prior art date
Application number
PCT/EP2006/069926
Other languages
English (en)
Inventor
Paul Claydon
Original Assignee
Crown Packaging Technology, Inc
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 Crown Packaging Technology, Inc filed Critical Crown Packaging Technology, Inc
Publication of WO2007071682A1 publication Critical patent/WO2007071682A1/fr

Links

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
    • B21D51/44—Making closures, e.g. caps
    • B21D51/46—Placing sealings or sealing material
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2615—Edge treatment of cans or tins
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2669—Transforming the shape of formed can bodies; Forming can bodies from flattened tubular blanks; Flattening can bodies
    • 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
    • B65D2517/5008—Details of flexible tape or foil-like material with a sealing coat
    • 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

Definitions

  • This invention relates to a can body.
  • a can body for products such as food, which are usually processed with overpressure.
  • Further aspects of the present invention relate to a can incorporating such a can body, and a method of forming such a can body.
  • Cans for the packaging food are typically of two or three-piece form, comprising a tubular can body, either cylindrical or irregular/polygonal in shape, with a base and closed by a can end, diaphragm, film, screw top or other closure.
  • the base may be integral with a cylindrical can body so as to form a so-called two-piece can body, or the can body may be formed from a tube of sheet metal with the edges of the sheet metal joined by a welded side seam, which is then closed at both ends to form a three- piece can.
  • Typical food cans that are closed by a seamed-on can end have sealing compound in the curled edge of a cover hook portion of the can end in order to provide a tight hermetic seam.
  • This is usually known as a double seam due to the two thicknesses of metal in the seam, one from the can body and the other from the can end.
  • a problem with a three-piece can body is that the welded side seam provides an irregular sealing surface for seaming.
  • the sealing compound needs to be precisely and uniformly placed so that the resultant ring of sealing compound within the seam has the right width, thickness and position to ensure that the seam has the required tightness.
  • Double seam technology is a precise art, which relies on numerous factors for seam integrity, of which the sealing compound is one important feature.
  • Cans for other products may use different closure arrangements; for example, a peelable foil may be seated on a separate ring, which, in turn, is seamed to the can body.
  • a peelable foil may be seated on a separate ring, which, in turn, is seamed to the can body.
  • Such can body and ring combinations are expensive to manufacture as the centre of the ring is generally scrapped, leading to material wastage. Proposals such as those described in
  • Patent Citation 0001 EP 1029613 A (IMPRESS GMBH & CO OHG). 2000-08-23. and
  • Patent Citation 0002 WO 2005063587 A (CROWN PACKAGING TECHNOLOGY INC). 2005-07-14. avoid wasting the centre of the ring, but include additional manufacturing stages, which in turn involve extra process time and/or capital equipment costs.
  • cans are re-closeable when the product is not to be used/ consumed at a single time and is therefore only partly dispensed.
  • the lever lid On a can body closed with a lever lid, the lever lid can generally be pressed back onto the can body in order to provide a degree of seal against the atmosphere.
  • food cans that incorporate conventional seamed-on can ends require one of the can ends to be removed to provide access to the food, the removed can end then being discarded.
  • seamed food cans require a separate cover for protecting the remaining food from the atmosphere. This offers, at best, simple protection and rarely provides a seal sufficient for maintaining food freshness.
  • a further requirement for the closure is to maintain a hermetic seal during processing of the can contents. This is particularly important for food products, which may need to undergo a variety of types of processing, according to the particular food product.
  • Overpressure retort processes are in common use for processing some food products such as tomatoes. Such food cans are often referred to as "vacuum" cans, although clearly there is a product in the can.
  • vacuum cans
  • This invention seeks to provide a can body for closing by a variety of closure panels (can end, diaphragm, disc etc.) at a reduced cost in comparison with traditional peelable closures.
  • it also seeks to provide a can body which, when filled, is suitable for closing and/or processing under partial vacuum such as in an overpressure retort process.
  • a can body having a base, a sidewall and a step which extends about the longitudinal axis of the can body, characterised in that a pliable material is placed on the step to form a seat for a closure, the pliable material being of a depth sufficient to permit the closure to be partially embedded in the seat to thereby both retain the closure and provide a hermetic seal.
  • Partial embedding of the closure in the seat formed by the pliable material assists in retaining the seal between the closure and the can body without the need for mechanical clipping or other means of additional reinforcement.
  • the can body may be of two or three-piece form. Considering a three-piece can having a sidewall with a welded side seam with the step integral to the sidewall, when the pliable material is placed around the step it covers the weld margin, thereby providing a generally flat sealing surface for a closure.
  • the pliable material is conveniently a plastic, an elastomer, rubber or a sealing compound.
  • Plasticized polyvinyl- chloride (PVC) has been found to be a suitable pliable material.
  • the pliable material is a plasticized PVC comprising PVC powder, a food grade plasticizer, wax, heat stabiliser, silicone oil and pigment.
  • the seat provided by the pliable material defines a generally flat surface, with the depth of the pliable material varying according to non-uniform features such as any weld margin or other geometric imperfections in the step.
  • This feature of the present invention assists in ensuring that a good seal is formed between the can body and the closure.
  • the step may be either external or internal such that the sidewall is stepped-out (or expanded) or stepped- in, or may be in the form of a fold or flattened bead, which in turn may radially extend either inwardly or outwardly.
  • a stepped-in sidewall and/or outwardly-flattened flange whilst possible within the scope of the invention, is not recommended in practice due especially to cut edge considerations within the pack and unnecessary usage of metal.
  • the use of a flattened bead provides excellent hoop strength and therefore abuse resistance.
  • a step of any kind which is provided on a beaded can body further enhances the good abuse resistance because it adds to the rigidity of the beaded sidewall.
  • the step may instead be provided on a separate ring con- nectable to the sidewall (e.g. by seaming).
  • the edge of the sidewall adjacent the step may be curled either outwardly or inwardly.
  • An inwardly curled edge is useful for snap-fitting a closure component underneath the curl.
  • a snap-fit feature provides re-closeability to the can, as well as providing a further obstacle (in addition to the bond between the closure and pliable material) to prevent the closure being prematurely ejected off the can body.
  • the can body is generally used in combination with a re-closeable end or closure which includes a vacuum release feature, such as a tab or ring pull, customised tab or press down button.
  • a vacuum release feature such as a tab or ring pull, customised tab or press down button.
  • the closure or release feature itself may include tamper evident features and/or leak detection.
  • a method of forming a can body with a step in its sidewall comprising, in a first embodiment, the steps of forming a curl in an edge of the can body's sidewall by die curling, beading the sidewall, forming the step and applying a fluid sealing compound on the step to form a seat for a closure, the sealing compound being of a depth sufficient to permit the closure to be partially embedded in the seat.
  • a method of forming a can body with a step in its sidewall comprising, in the following order, the steps of: beading the sidewall, forming the step in the sidewall, forming a curl in an edge of the can body's sidewall by spin curling, and applying a fluid sealing compound on the step to form a seat for a closure, the sealing compound being of a depth sufficient to permit the closure to be partially embedded in the seat.
  • a closure is preferably placed on the sealing compound whilst the compound is still fluid. This assists in ensuring that the sealing compound can readily adapt to any geometric imperfections on either the step or the closure, which thereby helps to provide a good hermetic seal when the sealing compound has hardened and set.
  • This method is preferred where double seaming is used for closing a three-piece can.
  • the closure When filling a three-piece can, the closure may be mechanically clipped to the can body so as to maintain a seal between the closure and the sealing compound during filling of the can body, with filling occurring via the opposite end of the can body (i.e. before vacuum (negative pressure) is achieved in the can).
  • Figure 1 is a schematic side section of a can body having a flattened bead as a radially inward step
  • Figure 2 is a schematic side section of a can body having a step which is stepped radially outwardly;
  • Figure 3 is a partial section of a closure seated on sealing compound
  • Figure 4 is a schematic side section similar to that of figure 1, with a clip retaining the closure and providing a lever-open function
  • Figure 5 is an alternative embodiment in which the can body includes a separate ring
  • Figure 6 is a further lever-open version of the closure of figure 1.
  • the schematic side sections of figures 1 and 2 each comprise a can body 1 of 0.16 mm thickness tinplate terminating at the upper end of its sidewall 3 in an outwards curl 5.
  • the can body 1 wall thickness could be in the range of 0.14 to 0.25 mm.
  • the sidewall 3 of each figure includes a step 10 which provides a shelf on which sealing compound 12 is deposited whilst in a fluid state.
  • a closure 20 of 0.16 to 0.21 mm gauge tinplate or tin free steel is seated on the step 10 as shown, such that the periphery of the closure is partially embedded in the sealing compound 12.
  • the step 10 comprises a bead 15, which has been flattened so as to form a shelf of the order of 3 mm in width with a relatively flat upper surface 17 on which the sealing compound 12 is deposited whilst in a fluid state.
  • the width and geometry of the shelf must be sufficient to allow for placement and curing of the fluid sealing compound 12 without the sealing compound flowing over the edge of the shelf.
  • the closure 20 is placed on the fluid sealing compound 12, thereby forming a depression 13 in the sealing compound.
  • the sealing compound 12 sets into the shape of the depression 13 as the compound cures/hardens, thereby retaining the closure 20 and providing a hermetic seal.
  • step 10 of the can body 1 of figure 2 forms a shelf for the fluid sealing compound 12 onto which the closure 20 is placed to thereby form depression 13.
  • the sealing compound 12 is a plasticized polyvinyl-chloride (PVC) comprising PVC powder, a food grade plasticizer, wax, heat stabiliser, silicone oil and pigment (referred to as 038 lining compound).
  • PVC plasticized polyvinyl-chloride
  • 038 lining compound a plasticized polyvinyl-chloride
  • other types of materials may also be suitable.
  • the sealing compound 12 has been deposited on the step 10 in a fluid state and covers the weld step 25 so as to provide a smooth flat surface for seating the closure 20.
  • Figure 4 is a similar side section to that of figure 1 with the can body sidewall terminating in an inwards curl 5.
  • the closure 30 comprises a centre panel 32, which extends radially outwardly into a bead 34 and terminates in a radially outwards curl 36.
  • the closure bead 34 is seated on the sealing compound 12 on the upper surface of shelf 17 as in the example of figure 1.
  • a plastic clip 40 clips over the pair of curls 5, 36 to retain the closure more firmly in position by supplementing the bond between the sealing compound 12 and the closure 30.
  • the clip 40 extends radially inwardly into a tab 38 for ease of opening.
  • the can body includes a separate ring 50 with a step 56 on the ring rather than on the sidewall itself.
  • the ring 50 is fixed to the can body sidewall typically by a double seam, and then the can body and ring combination are closed by a closure 32.
  • the closure 32 may be in the form of a peelable panel.
  • the ring 50 is shown with a seaming panel 54, prior to seaming to the can body.
  • the flat panel construction of the closure 32 shown in figure 5 prevents the periphery of the closure 32 from settling too deeply into the sealing compound 12, or cutting through the sealing compound 12 onto the shelf 56 itself.
  • the closure 32 of figure 5 has hemmed edges and is stuck to the sealing compound 12 as described above, with the tab 38 being folded back over the flat panel of the closure 32.
  • the lever-open version of figure 6 has a closure 20 which is similar to that of figure 1.
  • the closure 20 comprises a panel and an upright wall depending from the panel, the upright wall terminating in a curl, the curl forming depression 13 in the sealing compound 12.
  • the upright wall in the embodiment of figure 6 includes a groove 62 above the curl into which a spoon 60 or other lever can be inserted in order to lever the closure 20 off the sealing compound 12 to thereby open the container.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Closures For Containers (AREA)

Abstract

L’invention concerne un corps de boîte doté d’un rebord ou d’un gradin (17) sur lequel est déposé une matière souple telle qu’un produit de garnissage (12) à l’état fluide. Un couvercle (30) est placé sur le rebord (17) alors que le produit (12) est toujours à l’état fluide. Le couvercle (30) forme ainsi une empreinte dans le produit (12) qui durcit ensuite pour fixer le couvercle (30) en place. Le corps de boîtier de l’invention convient tout particulièrement au conditionnement de produits alimentaires qui sont ensuite soumis à un traitement dans un autoclave à pression.
PCT/EP2006/069926 2005-12-23 2006-12-19 Corps de boite dote d’un rebord ou d’un gradin sur lequel est depose un produit d’etancheite, et son procede de fabrication WO2007071682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05112915A EP1800770A1 (fr) 2005-12-23 2005-12-23 Corps de boîte avec une matière d'étanchéité placée sur une collerette ou sur un échelon et procédé de formage d'un tel corps de boîte
EP05112915.3 2005-12-23

Publications (1)

Publication Number Publication Date
WO2007071682A1 true WO2007071682A1 (fr) 2007-06-28

Family

ID=36679227

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/069926 WO2007071682A1 (fr) 2005-12-23 2006-12-19 Corps de boite dote d’un rebord ou d’un gradin sur lequel est depose un produit d’etancheite, et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP1800770A1 (fr)
WO (1) WO2007071682A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH709571A1 (de) * 2014-04-29 2015-10-30 Soudronic Ag Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie ein Aufreissdeckel.
JP2018536596A (ja) * 2015-12-10 2018-12-13 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． 金属飲料容器のための逆縁巻き方法び逆縁巻きを有する飲料容器
US20240010395A1 (en) * 2015-03-11 2024-01-11 Crown Packaging Technology, Inc. Ringless Metal Cans and Method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10329055B2 (en) 2011-07-21 2019-06-25 Crown Packaging Technology, Inc. Metal cans with peelable lids
GB201214716D0 (en) * 2012-08-17 2012-10-03 Crown Packaging Technology Inc Metal cans with peelable lids

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2019376A (en) * 1934-09-12 1935-10-29 Continental Can Co Container for shoe polish
US3616962A (en) * 1969-12-12 1971-11-02 Sweetheart Plastics Sealed container or cup
GB2164015A (en) * 1984-09-07 1986-03-12 Palime Sa Metal container with integral rim for receiving lid
FR2639561A1 (fr) * 1988-11-29 1990-06-01 Carnaud Sa Procede de fabrication d'un emballage metallique a opercule souple et emballage metallique correspondant
DE4038870A1 (de) * 1990-09-11 1992-06-04 Effem Gmbh Druckdeckeldose
EP0919482A1 (fr) * 1997-11-27 1999-06-02 Nihon Seikan Kabushiki Kaisha Boíte métallique et son procédé de fabrication
EP1495980A1 (fr) * 2003-07-08 2005-01-12 CONSAFE ApS Récipient en matériau métallique comprenant une couverture antichoc

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9418290D0 (en) * 1994-09-10 1994-10-26 Metal Box Plc Containers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2019376A (en) * 1934-09-12 1935-10-29 Continental Can Co Container for shoe polish
US3616962A (en) * 1969-12-12 1971-11-02 Sweetheart Plastics Sealed container or cup
GB2164015A (en) * 1984-09-07 1986-03-12 Palime Sa Metal container with integral rim for receiving lid
FR2639561A1 (fr) * 1988-11-29 1990-06-01 Carnaud Sa Procede de fabrication d'un emballage metallique a opercule souple et emballage metallique correspondant
DE4038870A1 (de) * 1990-09-11 1992-06-04 Effem Gmbh Druckdeckeldose
EP0919482A1 (fr) * 1997-11-27 1999-06-02 Nihon Seikan Kabushiki Kaisha Boíte métallique et son procédé de fabrication
EP1495980A1 (fr) * 2003-07-08 2005-01-12 CONSAFE ApS Récipient en matériau métallique comprenant une couverture antichoc

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH709571A1 (de) * 2014-04-29 2015-10-30 Soudronic Ag Verfahren und Vorrichtung zur Herstellung von Aufreissdeckeln sowie ein Aufreissdeckel.
US20240010395A1 (en) * 2015-03-11 2024-01-11 Crown Packaging Technology, Inc. Ringless Metal Cans and Method
JP2018536596A (ja) * 2015-12-10 2018-12-13 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． 金属飲料容器のための逆縁巻き方法び逆縁巻きを有する飲料容器

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