WO2012152608A1 - Élément pelable - Google Patents

Élément pelable Download PDF

Info

Publication number
WO2012152608A1
WO2012152608A1 PCT/EP2012/057895 EP2012057895W WO2012152608A1 WO 2012152608 A1 WO2012152608 A1 WO 2012152608A1 EP 2012057895 W EP2012057895 W EP 2012057895W WO 2012152608 A1 WO2012152608 A1 WO 2012152608A1
Authority
WO
WIPO (PCT)
Prior art keywords
container body
annular
lid
sealing surface
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.)
Ceased
Application number
PCT/EP2012/057895
Other languages
English (en)
Inventor
Gerry Patrick DOYLE
Ian Maxwell
Mark Jonathan Prestidge
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.)
Crown Packaging Technology Inc
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 WO2012152608A1 publication Critical patent/WO2012152608A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • B21D51/2653—Methods or machines for closing cans by applying caps or bottoms
    • B21D51/2661—Sealing or closing means therefor
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • 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
    • B21D51/2653—Methods or machines for closing cans by applying caps or bottoms
    • 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
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container

Definitions

  • This invention relates to an improved closure for a metal container body in which a lid of peelable lidding material is sealed directly to an upwardly and outwardly inclined sealing surface, the sealing surface being an inner surface of the container body.
  • Another aspect of the invention relates to a method of making such a closure.
  • EP 1855822 B (CROWN PACKAGING TECHNOLOGY, INC) 30/12/2009 discloses a metal container having a lid of peelable lidding material sealed directly to a sealing surface, the sealing surface being an inner surface of a container body delimiting the access opening of the container body.
  • the peelable lidding material is a multilayer structure with an aluminium layer of from 6 to 90 microns thickness and a bond layer. Having the lidding material sealed directlyio the inner surface of the can body avoids having to bond the lidding material to an intermediate metal ring, which in turn would have to be fastened to the container body.
  • the sealing surface is upwardly and outwardly inclined (as shown in figures 3 to 5 of EP 1855822 B1 ).
  • the stackability results from the upward and outward inclination of the sealing surface, which defines a recess within which the base of another container can nestle.
  • the inclined sealing surface also has the benefit of increasing the rigidity of the container and its ability to sustain being dropped without damage being caused to the container.
  • negative differential pressure is meant where the pressure outside the enclosed volume of the container is greater than that within the enclosed volume of the container.
  • the container may be vacuum packed, in which case the negative differential pressure would remain until the container is opened.
  • the negative differential pressure may arise during the sterilisation process. Regardless of precisely how the negative differential pressure occurs, it causes the lid to be stretched across the access opening into an inward facing dome.
  • figure 1 shows a container body 1 of the type disclosed in EP 1855822 B1 having an inclined sealing surface 2, to which is sealed a lid 3 of peelable lidding material to define an annular bond region 4.
  • the figure shows the action of negative differential pressure P resulting from vacuum packing or retort processing in stretching the lidding material across the access opening into an inward facing dome having a radius of curvature R.
  • the change in curvature in the lid where the dome meets the annular bond region 4 induces a peel force F p component acting at the inside edge of the bond region.
  • This peel force component F p can result in progressive peeling of the lid 3 from the inclined sealing surface 2 (this is also shown on figure 1) - a phenomenon known as "peelback".
  • peelback initiates from the inside of the container, it is not visible to either the filler or a consumer. In serious cases, peelback can result in rupture of the seal between the lid and sealing surface. Even where rupture does not occur, it can result in a reduction of the seal width and therefore an undesirable weakening of the seal.
  • the invention provides both a closure and a method of making a closure having these advantages.
  • a metal container body having an access opening, and a lid for closing the access opening
  • the lid formed of a peelable lidding material and having a seal portion and a central portion, the seal portion enclosing the central portion and fixed directly to a sealing surface to define an annular bond region, the sealing surface being an inner surface of the container body delimiting the access opening, at least part of the sealing surface being upwardly and outwardly inclined from the container body's central axis;
  • the sealing surface at and outwardly adjacent to the inside edge of the annular bond region (4) is inclined (2b) such that when a negative differential pressure is applied over the lid's central portion to stretch the central portion across the access opening into an inwardly domed profile, at any given annular location on the inside edge of the annular bond region the relative inclination of the central portion and the seal portion is such that a non-peel loading is applied to the annular bond region; and wherein the sealing surface (2) at and outwardly adjacent to the inside edge of the annular bond region comprises an annular step (2a), the annular step (2a) extending either:
  • the annular bond region represents the seal established between the lid and the container body.
  • annular bond region adjacent to the inside edge of the annular bond region helps to avoid the problem of peelback by ensuring that the annular bond region is
  • the invention provides a solution to the problem of peelback, whilst
  • the step need only be of the order of 1 to 2 mm in width; therefore, it does not add appreciably to the size and footprint of the container.
  • the central portion of the lid with a profile comprising one or more annular beads.
  • the lid is formed so that an annular unbonded region of the central portion of the lid extends down along the inner surface of the container body.
  • the sealing surface is profiled to define a concavely-profiled segment when viewed from above the access opening of the container body.
  • the concavely profiled sealing surface is profiled such that its radius of curvature at and outwardly adjacent to the inside edge of the annular bond region corresponds with that of the central portion of the lid when subject to the negative differential pressure.
  • the lid is preferably a laminate structure.
  • a preferred form of laminate structure is one having a metal substrate to provide a gas-tight layer (aluminium is particularly preferred), the substrate coated on one surface with a heat sealable coating to enable easy fixing to the container body.
  • the lid comprises an aluminium layer of from 6 to 90 microns thickness.
  • the lid may also include a tab (preferably being an integral part of the lid structure). The tab may be folded back onto the lid and, optionally, at least partly fixed to the lid (for example, by heat sealing) so as to keep the tab folded back onto the lid.
  • the container body aluminium or steel are particularly preferred materials.
  • the container body is preferably formed from a metal sheet section deformed into a cylinder, the adjoining sides of the metal sheet welded together along the height of the cylinder.
  • a heat sealable lacquer is applied to the interior of the container body to enable the lid to be heat sealed to the container body.
  • an especially good heat seal is provided by ensuring that the lacquer system on the container body and the coating on the interior facing surface of the lid each contain polypropylene.
  • the invention is not linnited to use of particular materials, other than the requirement for the container body to be made of metal. Rather, the lid and container body each have any structure (including any coatings or lacquers) that enable formation of a peelable bond between the lid and the container body.
  • outwardly inclined part of the sealing surface is preferably inclined from the container body's central axis at an acute angle of from 20° to 60°.
  • the method of the invention avoids the above-mentioned problems of the background art by ensuring that the lacquer is applied before formation of the outwardly inclined part to which the lid is later bonded. This thereby allows the coating to dry without undesired "run-off' and therefore avoids undesired localised thinning of the lacquer, especially at the location corresponding to the inside edge of the bond between the lid and the container body.
  • the method may be adapted to provide the container body and the lid with the features defined for the closure of the invention.
  • a peripheral curl is formed at the end of the container body. This is formed before, during or after step iii of the method of the invention.
  • Figure 1 shows a cross-section through a closure of the prior art, indicating the problems of peelback (see earlier discussion of the Background Art).
  • Figure 2 shows a cross-section through a first embodiment of a closure according to the invention, before and after application of a negative differential pressure.
  • Figure 3 shows a cross-section through a second embodiment of a closure according to the invention, before and after application of a negative differential pressure.
  • Figure 4 shows a cross-section through the embodiments of figures 1 and 2 after application of the negative differential pressure.
  • Figures 5 to 8 show cross-section views illustrating the method of the
  • Figure 2 shows a metal container body 1 having an annular sealing
  • annular bond region 4 represents the seal established between the lid 3 and the container body 1.
  • the sealing surface 2 has a horizontal step portion 2a and an inclined portion 2b. As shown in the figures, the sealing surface 2 is an inner surface of the container body 1 , with the inclined portion 2b being inclined upwardly and outwardly at an angle of around 60° from the central axis 5 of the container body 1. The end of the container body outwards of the sealing surface terminates in a peripheral curl 6.
  • the lid 3 is shown divided into two distinct portions:
  • seal portion 3a representing that portion of the lid 3 which is bonded to the sealing surface 2 to form the annular bond region 4;
  • the lid 3 is profiled with two annular beads 7 (see figure 2) before application of any negative differential pressure.
  • the second embodiment differs from that of figure 2 in having an annular unbonded region 8 of the central portion 3b of the lid 3 extending down along the inside surface of the container body 1 before application of any negative differential pressure (see figure 3).
  • the dashed line in figures 2 & 3 shows the action of a negative differential pressure P acting over the area of the lid 3.
  • the negative differential pressure P may arise from the filled container undergoing a sterilisation process in a retort, or a filled container being vacuum sealed.
  • the negative differential pressure P has the effect of deforming the central portion 3b into an inwardly-protruding dome having a radius of curvature R.
  • Figure 4 is applicable to the embodiments of figures 1 & 2 and shows a detail view of the container body 1 and lid 3 in the region of the annular bond region 4, showing the forces imposed on the annular bond region as a result of the central portion 3b being subjected to the negative differential pressure P.
  • the incorporation of the horizontal step portion 2a at and outwardly adjacent to the inside edge of the annular bond region 4 ensures that the inward doming of the central portion 3b under the action of the negative differential pressure P does not act to impose peel forces on the bond region 4. Rather, the annular bond region 4 is instead loaded in shear ⁇ . Therefore, peelback of the lidding material is avoided.
  • the influence of the horizontal step portion 2a and the doming of the central portion 3b can also be understood by comparison of angles a and ⁇ at a given annular location 'A' on the inside edge of the annular bond region 4:
  • angle a represents the acute angle between i) a tangent 9 to the central portion 3b of the domed lid and ii) horizontal plane 10; and where angle ⁇ represents the acute angle between i) a tangent 12 to the seal portion 3a of the domed lid 3 and ii) the horizontal plane 10.
  • the horizontal step portion 2a is parallel to the horizontal plane 10, meaning that the tangent 12 lies parallel to the plane 9 and therefore angle ⁇ is zero.
  • Figures 5 to 8 relates to the method of the invention.
  • a straight walled cylindrical container body 10 provided with a peripheral curl 1 1 at one end is shown in figure 5.
  • a heat sealable lacquer, preferably containing polypropylene, is applied by a spraying assembly 12 to a localised annular region of the inner surface of the container body 10 adjacent the end of the container body. This results in a localised annular coated region 13 adjacent the end of the container body 10.
  • the lacquer on the annular coated region 13 is then allowed to dry and is cured.
  • the lack of any discontinuity on the surface of the container body 10 to which the lacquer is applied means that the lacquer is able to dry and cure having a consistent uniform thickness. There is no tendency for "run-off' to occur.
  • annular part 14 of the inner surface of the container body 10 is then outwardly inclined relative to the remainder of the inner surface of the container body 10.
  • this is achieved by use of a spinning tool 15 having an inclined surface 16 and able to rotate about its longitudinal axis 17. Either or both of the spinning tool 15 and the end of the container body 10 are driven towards each other, with the rotating action of the spinning tool 15 causing the annular part 14 to be progressively outwardly inclined.
  • the resulting inclined annular part 14 of the container body's inner surface has an inclination corresponding to that of the inclined surface 16 of the spinning tool 15.
  • Other means such as die flanging, may be used to incline the annular part 14 of the container body's inner surface. Formation of the inclined annular part 14 results in the annular coated region 13 - being of uniform thickness - extending over a majority of the inclined annular part 14 and just over the transition region 15 with the remainder of the container body's inner surface.
  • a lid 18 is sealed to the inclined annular part 14 (as shown in figure 8).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

L'invention porte sur une fermeture perfectionnée pour un corps de récipient métallique (1) dans lequel un opercule (3) fait d'une matière de fermeture pelable est soudé directement sur une surface de scellement inclinée vers le haut et vers l'extérieur (2), la surface de scellement étant une surface intérieure du corps du récipient. Un autre aspect de l'invention concerne un procédé de fabrication d'une telle fermeture. La surface de scellement située au bord intérieur, ou dans une position adjacente et extérieure au bord intérieur d'une région de fixation annulaire (4) est inclinée de telle sorte qu'une charge étrangère à l'enlèvement est appliquée à la région de la fixation annulaire.
PCT/EP2012/057895 2011-05-06 2012-04-30 Élément pelable Ceased WO2012152608A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11165067.7 2011-05-06
EP11165067 2011-05-06

Publications (1)

Publication Number Publication Date
WO2012152608A1 true WO2012152608A1 (fr) 2012-11-15

Family

ID=44534852

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/057895 Ceased WO2012152608A1 (fr) 2011-05-06 2012-04-30 Élément pelable

Country Status (1)

Country Link
WO (1) WO2012152608A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890759A (en) * 1989-01-26 1990-01-02 Aluminum Company Of America Retortable container with easily-openable lid
WO2004083066A1 (fr) * 2003-03-18 2004-09-30 Werner Grabher Boite a obturation par membrane
EP1975076A1 (fr) * 2007-03-27 2008-10-01 Impress Verpackungen Erfstadt GmbH & Co. KG Boîte en fer et son procédé de fabrication
EP1855822B1 (fr) 2005-03-01 2009-12-30 CROWN Packaging Technology, Inc. Boite d'emballage
EP2184237A1 (fr) * 2008-11-10 2010-05-12 Crown Packaging Technology, Inc Fermeture pour conteneur et méthode pour sa fabrication
WO2010102665A1 (fr) * 2009-03-11 2010-09-16 Inventum Group B.V. Récipient

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890759A (en) * 1989-01-26 1990-01-02 Aluminum Company Of America Retortable container with easily-openable lid
WO2004083066A1 (fr) * 2003-03-18 2004-09-30 Werner Grabher Boite a obturation par membrane
EP1855822B1 (fr) 2005-03-01 2009-12-30 CROWN Packaging Technology, Inc. Boite d'emballage
EP1975076A1 (fr) * 2007-03-27 2008-10-01 Impress Verpackungen Erfstadt GmbH & Co. KG Boîte en fer et son procédé de fabrication
EP2184237A1 (fr) * 2008-11-10 2010-05-12 Crown Packaging Technology, Inc Fermeture pour conteneur et méthode pour sa fabrication
WO2010102665A1 (fr) * 2009-03-11 2010-09-16 Inventum Group B.V. Récipient

Similar Documents

Publication Publication Date Title
US20090032535A1 (en) Container
EP2427384B1 (fr) Réceptacle à fermeture sertie, procédé et appareil de fabrication
EP1855822B1 (fr) Boite d'emballage
US11130607B2 (en) Bottle can, bottle can with cap, and method for manufacturing bottle can
US9475620B2 (en) Closure
US10882658B2 (en) Metallic can and associated can lid
EP1526090A2 (fr) Récipient avec opercule facile à enlever
EP0357276A1 (fr) Produit emballé sous vide et procédé utilisant une membrane comme fermeture d'extrémité
US8807374B2 (en) Bimetallic corrosion mitigation
US20070272693A1 (en) Membrane Lid with Recessed Tab, and Container Incorporating Same
WO2012152608A1 (fr) Élément pelable
US20130105499A1 (en) Three-Piece Can and Method of Making Same
EP1800770A1 (fr) 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
JP4301668B2 (ja) 金属容器および金属容器の製造方法
JP2004026306A (ja) 金属缶の開口カール部
JP4404283B2 (ja) ネジ付き缶
CN1168114A (zh) 贮存容器的制作方法
US12365516B2 (en) Metal container and metal closure thereof
WO2025016943A1 (fr) Couvercle coiffant
OA19020A (en) Metal can and associated can lid
JP2020128229A (ja) 容器中間体、内容物入り容器の製造方法、内容物入り容器の製造設備、および内容物入り容器
WO2019107064A1 (fr) Corps de récipient métallique, produit de récipient métallique, procédé de production de produit de récipient métallique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12717742

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12717742

Country of ref document: EP

Kind code of ref document: A1