WO1999023007A1 - Fermetures sous vide - Google Patents

Fermetures sous vide Download PDF

Info

Publication number
WO1999023007A1
WO1999023007A1 PCT/GB1998/003075 GB9803075W WO9923007A1 WO 1999023007 A1 WO1999023007 A1 WO 1999023007A1 GB 9803075 W GB9803075 W GB 9803075W WO 9923007 A1 WO9923007 A1 WO 9923007A1
Authority
WO
WIPO (PCT)
Prior art keywords
container body
closure
vacuum
container
skirt portion
Prior art date
Application number
PCT/GB1998/003075
Other languages
English (en)
Inventor
Malcolm George Collins
Original Assignee
Crown Cork & Seal Technologies Corporation
Carnaudmetalbox Plc
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 Cork & Seal Technologies Corporation, Carnaudmetalbox Plc filed Critical Crown Cork & Seal Technologies Corporation
Priority to AU94501/98A priority Critical patent/AU9450198A/en
Publication of WO1999023007A1 publication Critical patent/WO1999023007A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/14—Rigid discs or spherical members adapted to be held in sealing engagement with mouth of container, e.g. closure plates for preserving jars
    • B65D51/145—Rigid discs or spherical members adapted to be held in sealing engagement with mouth of container, e.g. closure plates for preserving jars by means of an additional element connected directly to the container

Definitions

  • This invention relates to vacuum closures and particularly to closures of the press-on/pry-off type.
  • These closures whether applied to a glass jar as in UK 1477902 or to a metal can as in EP 0743260A, must be able to be removed by the user, despite the presence of a vacuum within the container to which the closure is fastened.
  • These closures have proved difficult to remove in the past, sometimes requiring opening forces in excess of 200N to remove the closure from a container. This has led to the adoption of vacuum release devices, as typified by US 5275679.
  • the present invention seeks to provide a press-on/pry-off closure which can be easily removed from the container to which it is attached, without needing a separate vacuum release system.
  • a container body and a press-on/pry-off vacuum closure for sealing the container body
  • the container body including a snap profile adjacent its open end
  • the closure comprising a moulded plastics ring having an annular cover portion, a downwardly dependent skirt portion, and inwardly projecting means on the said skirt portion for engaging the snap profile of the container body, said cover portion, skirt portion and inwardly projecting means cooperating to form an inwardly facing channel, a circular metal panel positioned within the plastics ring and having its periphery received within the said channel, the arrangement of the snap profile, skirt portion and periphery of the metal panel being such that the vacuum closure can be removed from the container body with an opening force of less than 50N despite the presence within the container of a vacuum of less than O. ⁇ atm (24 inches Hg) without needing to release the vacuum prior to opening.
  • the invention relates to press-on/pry-off closures having a plastics ring surrounding the metal panel, unlike US 5275679. Similarly the presence of the annular cover portion means that the metal panel must be assembled into the plastics ring from underneath.
  • This type of closure is known in the art as a "bottom load” closure.
  • the vacuum of 0.8 atm (24 inches Hg) is typical of that produced by the steam flow processing of foodstuffs etc) .
  • the invention further resides in the provision of, in combination, a container body and a press-on/pry-off vacuum closure for sealing the container body, the container body including a snap profile adjacent its open end the closure comprising a moulded plastics ring having an annular cover portion, a downwardly dependent skirt portion, and inwardly projecting means on the said skirt portion for engaging the snap profile of the container body, said cover portion, skirt portion and inwardly projecting means cooperating to form an inwardly facing channel, a circular metal panel positioned within the plastics ring and having its periphery received within the said channel, the periphery of the metal panel comprising a generally downwardly turned rim portion, said rim portion having an outwardly turned curl such that the vacuum closure can be removed from the container body with an opening force of less than 50N, despite the presence within the container of a vacuum of less than 0.8atm (24 inches Hg) , without needing to release the vacuum prior to opening.
  • the outwardly turned curl provides some "width" to the rim portion so that when it is acted upon by the plastics ring, some outward bowing of the rim portion and concomitant local seal disruption is likely to occur. This is believed to aid with the removal of the closure from the container, resulting in the unusually low opening force experienced for this type of closure.
  • the extent of the outwardly turned curl is at least twice the thickness and preferably four times the thickness of the rim portion.
  • the invention further resides in the provision of, in combination, a container body and a press-on/pry-off vacuum closure for sealing the container body, the container body including a snap profile adjacent its open end, the closure comprising a moulded plastics ring having an annular cover portion, a downwardly dependent skirt portion, and inwardly projecting means on the said skirt portion for engaging the snap profile of the container body, said cover portion, skirt portion and inwardly projecting means cooperating to form an inwardly facing channel, a circular metal panel positioned within the plastics ring and having its periphery received within the said channel, the channel having a substantially horizontal base upon which the periphery of the metal panel is constrained to lie such that the vacuum closure can be removed from the container body with an opening force of less than 50N, despite the presence within the container of a vacuum of less than 0.8 atm (24 inches Hg) , without needing to release the vacuum prior to opening.
  • this horizontal base is believed to prevent slippage of the periphery of metal panel relative to the plastics ring, and aid with the efficient transfer of applied opening force and resultant movement from the plastics ring to the metal panel.
  • a substantially horizontal base to the recess can only be provided by the use of collapsible core tooling for the moulding of the plastics ring.
  • Previous press-on/pry-off closures such as those of UK 1477902 or EP 0743260A have tended to use more conventional "bump off" tooling, which requires a downwardly sloped surface to the bottom of the recess.
  • Fig.l is a schematic side view of a closure/container combination in accordance with the present invention
  • Fig.2 is a schematic sectional view of a part of the closure/container combination of Fig.l in accordance with a first embodiment of the present invention
  • Fig.3 is a schematic sectional view of a part of the closure/container combination of Fig.l in accordance with a second embodiment of the invention
  • Fig.4 is a schematic sectional view of a part of the closure/container combination of Fig.l in accordance with a third embodiment of the invention; and Fig.5 is an underneath plan view of the moulded plastics ring employed in the closure/container combinations of Figs. 1 to 4.
  • a container shown generally at 1 is sealed by means of a closure shown generally at 2.
  • the container is formed of glass or in this case metal, and contains a product such as a foodstuff packed and sealed by means of a closure 2 such that there is a vacuum within the container.
  • the vacuum is typically of between 0.5 and 0.8 at (16 - 24 inches Hg) .
  • Fig.2 shows the juncture between the closure and the container of Fig.l.
  • the mouth of the container 1 is defined by an outturned peripheral curl 3 of elongate form.
  • the top of the curl 3 is generally semi-spherical in cross - section and forms a rounded free edge 4 for the container. Below this free edge the curl extends at first downwardly and outwardly, and then downwardly and inwardly, so as to form a snap profile shown generally at 5.
  • the bottom of the curl 3 is folded under, as shown at 6, in order to hide the cut edge of the metal from view.
  • the vacuum closure 2 by which the container 1 is closed is of composite construction having a generally metal centre panel in the form of a disc 7, and a moulded plastics ring 8 into which the disc is fitted.
  • the plastics ring 8 comprises a cylindrical skirt 9, having a cover portion in the form of an inturned annular flange
  • the snap bead 11 defines, together with the flange 10, a channel 12 in which the periphery of the metal disc 7 is received.
  • the disc 7 comprises a centre portion 13 and at its periphery a down turned rim 14.
  • the rim 14 ends in an out turned hook portion 15 which is received in the channel 12.
  • the upper face of the snap bead 11 is substantially horizontal, defining a horizontal base 16 to the channel 12.
  • the hook portion 15 rests on the horizontal base 16.
  • a ring of plastisol sealing compound 17 is positioned within a recess 18 in the metal disc 7, and forms a seal between the disc and the top of the curl 3 at the mouth of the container.
  • closure 2 may be reapplied to the container 1 and will be held in position by the snap bead 11 on the closure clipping over the snap profile 5 on the container. Whilst such a reconnection may not provide a hermetic seal, it will provide a reclosure which will prevent dust and other large foreign objects from entering the container.
  • Fig.3 shows an alternative construction in which like components are designated with like reference numerals. The major difference is that the hook portion 15 is extended into a full outer curl as shown at 19. The base of the curl 19 rests on the horizontal base 16 of the channel 12.
  • the closure of Fig.3 is removed from the container 1 in similar fashion to the arrangement of Fig.2, with the plastics ring 8 being pressed up to urge the curl 19 upwardly and outwardly with respect to the container.
  • the curl 19 also has the advantage of more effectively hiding the cut edge 20, which is vulnerable to corrosion.
  • Fig.4 shows a further alternative arrangement in which the rim portion 14 of the metal disc 7 is angled outwardly, as well as extending downwardly into the recess 12.
  • the rim portion extends at an angle of 14.5° to the vertical.
  • the end 21 of the rim portion 14 rests against the base portion 16 of the channel 12.
  • the plastics ring 8 is pressed upwardly lifting the rim portion of the disc 7 to separate the closure 2 from the container 1.
  • the end 21 of the rim portion digs into the horizontal base portion 16, causing the rim portion 14 to be deformed outwardly as the pressure is applied, thereby helping to break the seal between the compound 17 and container 1 and release the vacuum from within.
  • Fig.5 shows an underneath plan view of the plastics ring 8. The flange 10 and skirt 9 are clearly shown.
  • the inwardly projecting snap bead 11 is discontinuous in nature, four separate beads being shown in Fig.5. This is to assist in being able to load the metal disc into the plastics ring, past the snap bead 11.
  • the channel 12 is over 1.5mm deep (typically 1.8mm) and the metal disc must be able to be pushed over the snap bead 11 so that it can be received in the channel .
  • the use of the discontinuous snap bead reduces the force necessary to load the disc.
  • the plastics ring 8 is typically formed of a polypropylene material such as that supplied by Amoco under their reference 510GA20.
  • the flexural modulus of the polypropylene material is approximately 900MPa.
  • Other polymer materials for use in forming the plastics ring 8 are available, and such alternative materials will be known by those skilled in the art.
  • Table 1 shows the opening force (in N) needed to open various closures according to the invention.
  • Closures according to Figs. 2, 3 and 4 were applied to metal containers, in conditions simulating the retorting of foodstuffs.
  • a vacuum of between 0.5 and 0.8atm (16 - 24 inches Hg) was produced within the containers.
  • a metal strap with a 10mm hook on the end was hooked under the plastics ring 8 of the closures, adjacent one of the discontinuities between the various sections of snap bead 11. The hook was moved upwardly at a strain rate of 100mm per min. and the force required to remove the closure from the container was recorded.
  • the Table shows the force required to remove the closure, with and without the presence of the vacuum.
  • Tests 1 to 3 were on closures as shown in Fig.2, tests 4 to 6 on closures as shown in Fig.3, and tests 7 and 8 on closures as shown in Fig.4. All of the measurements compared favourably with the opening forces (typically 20ON or more) sometimes experienced with more conventional press-on/pry-off vacuum closures.

Landscapes

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

Abstract

La présente invention concerne une fermeture sous vide fermée par pression/ouverte par déformation, associée à un corps de récipient (1) comprenant un anneau (8) en plastique moulé pourvu d'une partie jupe (9) soutenue vers le bas. La partie jupe comprend un canal (12) possédant une base (16) sensiblement horizontale. La fermeture comprend, en outre, un disque métallique (7) avec un bord (14) tourné vers le bas, doté d'un composant tourné extérieurement tel qu'une boucle (19) extérieure. Une périphérie du disque métallique repose sur la base horizontale du canal (12 ) de sorte que la fermeture peut être retirée du corps de récipient par pression ascendante sur la partie jupe (9) de plastique. La fermeture peut être ouverte par une force d'ouverture de moins 50N, malgré la présence d'un vide de moins de 0,8 atmosphère (24 inch/Hg) dans le récipient.
PCT/GB1998/003075 1997-10-30 1998-10-12 Fermetures sous vide WO1999023007A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU94501/98A AU9450198A (en) 1997-10-30 1998-10-12 Vacuum closures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9722898.5A GB9722898D0 (en) 1997-10-30 1997-10-30 Vacuum closures
GB9722898.5 1997-10-30

Publications (1)

Publication Number Publication Date
WO1999023007A1 true WO1999023007A1 (fr) 1999-05-14

Family

ID=10821298

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003075 WO1999023007A1 (fr) 1997-10-30 1998-10-12 Fermetures sous vide

Country Status (3)

Country Link
AU (1) AU9450198A (fr)
GB (1) GB9722898D0 (fr)
WO (1) WO1999023007A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003064276A2 (fr) * 2002-01-31 2003-08-07 Crown Cork & Seal Technologies Corporation Fermeture composite munie d'un element de fixation de disque

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314872A1 (fr) * 1975-06-19 1977-01-14 Massilly Usine Metallurg Capsule mixte pour le bouchage de recipients
GB1477902A (en) 1973-09-07 1977-06-29 Anchor Hocking Corp Closure cap
EP0366617A2 (fr) * 1988-09-26 1990-05-02 CMB ITALCAPS TECHNOLOGY s.r.l. Fermeture composite du type à enclenchement avec moyens d'inviolabilité
WO1993013990A1 (fr) * 1992-01-10 1993-07-22 Anchor Hocking Packaging Company Couvercle de fermeture a pression manuelle pour recipient ferme hermetiquement sous vide pouvant passer au four a micro-ondes
US5275679A (en) 1991-09-10 1994-01-04 Metalgrafica Rojek Ltda. Process to form a pressure release hole with removable seal, for easy opening, on metal lids for vacuum sealing of glasses and other glass containers used to pack foodstuff
EP0743260A1 (fr) 1995-05-19 1996-11-20 Fa.Ba. - Fabbrica Barattoli- S.P.A. Récipient métallique ayant un couvercle encliquetable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1477902A (en) 1973-09-07 1977-06-29 Anchor Hocking Corp Closure cap
FR2314872A1 (fr) * 1975-06-19 1977-01-14 Massilly Usine Metallurg Capsule mixte pour le bouchage de recipients
EP0366617A2 (fr) * 1988-09-26 1990-05-02 CMB ITALCAPS TECHNOLOGY s.r.l. Fermeture composite du type à enclenchement avec moyens d'inviolabilité
US5275679A (en) 1991-09-10 1994-01-04 Metalgrafica Rojek Ltda. Process to form a pressure release hole with removable seal, for easy opening, on metal lids for vacuum sealing of glasses and other glass containers used to pack foodstuff
WO1993013990A1 (fr) * 1992-01-10 1993-07-22 Anchor Hocking Packaging Company Couvercle de fermeture a pression manuelle pour recipient ferme hermetiquement sous vide pouvant passer au four a micro-ondes
EP0743260A1 (fr) 1995-05-19 1996-11-20 Fa.Ba. - Fabbrica Barattoli- S.P.A. Récipient métallique ayant un couvercle encliquetable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003064276A2 (fr) * 2002-01-31 2003-08-07 Crown Cork & Seal Technologies Corporation Fermeture composite munie d'un element de fixation de disque
WO2003064276A3 (fr) * 2002-01-31 2004-02-05 Crown Cork & Seal Tech Corp Fermeture composite munie d'un element de fixation de disque

Also Published As

Publication number Publication date
AU9450198A (en) 1999-05-24
GB9722898D0 (en) 1998-01-07

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