EP0434764B1 - Procede de remplissage et de fermeture hermetique d'un conteneur deformable - Google Patents

Procede de remplissage et de fermeture hermetique d'un conteneur deformable Download PDF

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Publication number
EP0434764B1
EP0434764B1 EP89911514A EP89911514A EP0434764B1 EP 0434764 B1 EP0434764 B1 EP 0434764B1 EP 89911514 A EP89911514 A EP 89911514A EP 89911514 A EP89911514 A EP 89911514A EP 0434764 B1 EP0434764 B1 EP 0434764B1
Authority
EP
European Patent Office
Prior art keywords
container
lid
sealing
product
headspace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89911514A
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German (de)
English (en)
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EP0434764A4 (en
EP0434764A1 (fr
Inventor
Roy Balcombe
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.)
Mars Inc
Original Assignee
Kal Kan Foods Inc
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Filing date
Publication date
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Publication of EP0434764A1 publication Critical patent/EP0434764A1/fr
Publication of EP0434764A4 publication Critical patent/EP0434764A4/en
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Publication of EP0434764B1 publication Critical patent/EP0434764B1/fr
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/025—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas specially adapted for rigid or semi-rigid containers
    • B65B31/028—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas specially adapted for rigid or semi-rigid containers closed by a lid sealed to the upper rim of the container, e.g. tray-like container

Definitions

  • This invention relates to a method of filling and sealing a container with a product, and more particularly, to a method of producing a package in which the integrity of the seal is preserved and voids within the container are virtually eliminated.
  • This headspace gas hinders exploitation of sterilizable containers, because of the difficulty of accurately controlling the pressure within the containers during temperature changes, to ensure the seals are not ruptured or containers otherwise deformed or damaged. If the headspace gas is air, this will cause spoilage of oxygen-sensitive products.
  • This headspace also has the appearance of a partially filled container, giving a poor value impression to the consumer.
  • the headspace allows movement of product during shipment, resulting in stressing of the lid material (which may rupture), and also damage to the product.
  • US-A-3492773 (Bergstrom) describes a method for vacuum packaging a container.
  • the bottom wall 12 of the container C in Bergstrom moves toward the open end of the container after filling and sealing to thereby reduce the volume of the container to "full" condition.
  • a weakened area is provided in the bottom wall 12 which includes a V-shaped groove or rib 17 and a second groove or rib 18 which is formed inwardly of rib 17. These ribs form fold lines for the take-up of material as bottom wall 12 moves toward the upper end of the container.
  • the container After the product P in Bergstrom has been placed into the container C, the container is placed in an evacuable chamber and air is evacuated therefrom. A cover is thereafter sealed to the container and the evacuation released. The container, however, remains inside the chamber. Thus, when the sealed package is exposed to atmosphere, the atmosphere pressure causes the container to deform along the weakened areas. According to Bergstrom, the bottom 12 moves towards the cover and the volume of the container is reduced substantially to that volume of the product contained therein.
  • the present invention provides a method of filling and sealing a bi-stable container, subjected to a gaseous environment, with a product, the method including the steps of placing the container bottom in its stable downwardly extended position; charging the product into the container to a level having a volume less than the container volume but equal to the filled volume with such level defining a headspace opening; placing the container in a vacuum environment chamber; and sealing a generally flat lid to said container; the method being characterised in that a semi-rigid container is provided having a bi-stable, flexible, unribbed bottom of continuous wall thickness having a hoop member surrounding the rigid side edges of the container and movable between a first position, wherein said container bottom is moved into a stable downwardly extended position, and a second position, wherein said container bottom is moved into a stable inverted domed configuration; and the vacuum environment is removed from the container so as to return the container to atmospheric pressure wherein hoop stress of said hoop member overcomes the bending stress around
  • the present invention also provides a container having a generally flat lid sealed to said container housing for covering a product within said container housing, said container being characterised in that: a semi-rigid container housing is provided for receiving a product filled therein to a volume less than the container volume but equal to the filled volume with such level defining a headspace opening; and said semi-rigid container housing having rigid side edges surrounding a bi-stable, flexible, unribbed bottom of continuous wall thickness having a hoop member surrounding the rigid side edges of the container and being movable between a first position, wherein said container bottom is moved into a stable downwardly extended position and remains in that position whilst the product is entered into the container housing in a vacuum environment, and a second position, wherein said unribbed bottom is inverted into a stable inverted domed configuration when the hoop stress overcomes the bending stress around the unribbed bottom on returning to atmospheric pressure thereby forcing the product into close contact with the lid to reduce the headspace opening between the product and the lid and wherein the lid remains in
  • a preferred embodiment of a container 10 is provided.
  • the body 10 has a bottom 12 which has a flexible insert 14 substantially deformable in shape. Since the hoop stress provides for tension along the circumference of the container base, the container is "bi-stable" in that it is stationary in either the up or down positions of the container.
  • the base includes a deformable hoop webbing 16 between the insert 14 and the side edges 18 of the container. These rigid side edges 18 support an upper flange 20 which extends outwardly therefrom.
  • the upper flange 20 includes a sealing surface 22 which terminates in a crimped raised rim section 24.
  • the container body is capable of receiving and retaining a top cut lid 26 which is sealed to the container in the grooves 27 formed between the sealing surface 22 and the raised rim section 24.
  • This lid is preferably formed of a puncture-resistant plastic material, but any material, including a nonplastic material, such as reinforced paper, which is substantially puncture-resistant may be utilized.
  • a force A moves the base 12 upwardly, the outer rim or hoop member 16 of the base is stretched.
  • the bending at the edges of the body induces stress to restore the body 10 to its original shape in the intermediate position of the deformable bottom.
  • the bottom is inverted forming an inverted U shape (see Fig. 4). This angle ⁇ is decreased as the hoop stress of the hoop member 16 resists the bending stress around the base.
  • the bottom is stable in either the up or down position, and as such, the bottom is bi-stable. Since the whole container is made of a semi-rigid material, the bottom is not a stretchable diaphragm. The base 12 is thus held stable in either position by the hoop stress of the outer diameter 16 of the base 12.
  • the container body may have a deformable bottom which is entirely deformable in shape.
  • the base does not include a hoop member, such as 16 (see Fig. 1).
  • the body of this preferred embodiment also includes semi-rigid side members which support an upper flange which extends outwardly from the side surfaces.
  • the upper flange includes a sealing surface which terminates in the rim section.
  • a force A applied to the container base moves the base upwardly thereby stretching the outer rim of the base.
  • the side walls of the container are pushed outward as the base is inverted. The bending at the edges induces stress to restore the container to its original shape.
  • the base is in its final upward position, the hoop stress along the side edges resists this bending stress and holds the base stable in the up position.
  • the containers may be manufactured with the base either up or down, provided the hoop stress induced in the outer diameter of the base can resist the restoring stresses, and can hold the base stable in the position opposite to the manufactured position.
  • FIG. 5 A preferred method for filling and sealing these deformable containers is shown in Figs. 5-9.
  • the sealing surface 22 of the container body 10 is mounted on support arms 28 of an anvil 30.
  • the cavity 32 of container body 10 is charged with a product 34 from a filler 36.
  • This product charge is sufficiently fluid or malleable so that it will not tend to assume any specific natural shape, but however, will fill the void volume of the container with a secured lid.
  • the container is filled with the insert 14 of the base 12 in its downwardly position. After the product has been initially charged into the container, there is still sufficient headspace, however, to permit lid placement without squeezing the top of the product fill onto the sealing surface (see Fig. 6).
  • a sealing head 40 is disposed in the vacuum chamber immediately above anvil 30 in its raised position.
  • the gas in the vacuum chamber 38 is evacuated through multiple ports 42a, b and c. Due to the force of the evacuation, an opening 44 is formed between lid 26 and sealing surface 22 of the container body 10, and as a result thereof, the pressure of the headspace air within the container is lowered to that of the vacuum chamber.
  • the seal head 40 When the desired vacuum level is achieved within the chamber 38, and as such, gas has been exhausted through ports 42a, b and c, the seal head 40 is lowered and the lid 26 is sealed to the sealing surface 22 of the container body 10, as is shown in Fig. 8. Even though the preferred embodiment herein discloses that the lid may be heat sealed to the sealing surface 22 of container body 10, other methods of dealing may be utilized. These include induction sealing, spin welding, cold seal, ultrasonic sealing or seaming. The edges 46 of the seal head 40 apply pressure to the outward edges 48 of the continuous top lid 26 such that the outward edges 48 are closely confined to the sealing surface 22 of container body 10 (see Fig. 8). During this sealing process, the vacuum is maintained.
  • the container is removed from the vacuum chamber such that the container is brought back to atmospheric pressure.
  • the deformable insert 14 of base 12 is inverted upwardly, thereby forcing the product 34 in the direction of arrow B to fill the headspace and voids 50.
  • the wet or dry products within the container must be sufficiently mobile to move into the voids. Since the product is forced into the voids 50 when the container is brought back to atmospheric pressure, the value impression of the product to the consumer is thereby improved.
  • such a method of filling and sealing a deformable container enables the fill volume to be less than the initial container volume to thereby isolate the product from the seal area to avoid seal area contamination. This process, however, also eliminates voids within the container which allow product movement.
  • the force A may be caused by either the return to atmospheric pressure of the container after the vacuum environment is terminated or by a mechanical push.
  • the container is not bi-stable, such that the deformable bottom remains in the down position unless held up by a vacuum, or partial vacuum, within the container, a worker will then be able to recognize that a loss of sufficient vacuum occurred during filling. As a result thereof, the product should be rejected.
  • this method may be utilized for steam flushing, as is shown in Figs. 10 and 11, which is an important alternative for filling the container with a hot product. Without steam flushing, the vacuum maintained during the process would cause the hot product to boil. With this steam flushing process, the evacuation of the pack may be achieved by flushing out the headspace gas 52 (see Fig. 10) with steam 54 from a steam duct 56 just prior to sealing the lid. The steam exits the headspace through an extract duct 58. While the steam flushing is taking place, the lid 60 of container 62 is held above the container 62 by a lid holding device 64. As in the previous preferred embodiment, the sealing surface 66 of the container is mounted on support arms 68 of an anvil 70. Additionally, a sealing head 74 is in its raised position above the sealing surface of the container.
  • the sealing head is lowered and the lid is sealed to the sealing surface of the container body (see Fig. 11).
  • This steam will then condense to water, on cooling, resulting in a vacuum within the container headspace.
  • the container is then subjected to atmospheric pressure to invert the container bottom into its upward position thereby forcing the product into close contact with the lid to thereby reduce the headspace between the product and the lid.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing Of Containers (AREA)
  • Vacuum Packaging (AREA)

Claims (15)

  1. Procédé pour remplir avec un produit et fermer de façon étanche un conteneur bistable (10), soumis à un environnement gazeux, le procédé comportant les étapes consistant à placer le fond (12) du conteneur dans sa position stable dans laquelle il s'étend dans une position déployée vers le bas; charger le produit (34) dans le conteneur jusqu'à un niveau correspondant à un volume inférieur à celui du volume du conteneur, mais égal au volume rempli, un tel niveau définissant une ouverture supérieure (50); placer le conteneur dans une chambre à environnement sous vide (38); et appliquer d'une manière étanche un couvercle de forme générale plate (26) sur ledit conteneur; le procédé étant caractérisé en ce qu'il est prévu un conteneur semi-rigide (10) possédant un fond flexible bistable non nervuré (12) possédant une épaisseur de paroi continue et comportant un élément en forme d'anneau (16) entourant les bords latéraux rigides (18) du conteneur et pouvant être amené entre une première position, dans laquelle ledit fond (12) du conteneur est amené dans une position stable qui s'étend dans une position déployée vers le bas, et une seconde position, dans laquelle ledit fond (12) du conteneur est amené dans une configuration stable en forme de dôme renversé; et on supprime l'environnement de vide du conteneur (10) de manière à ramener le conteneur à la pression atmosphérique, la contrainte dudit élément en forme d'anneau (16) dépasse la contrainte de flexion autour dudit fond non nervuré de sorte que le fond non nervuré (12) du conteneur est inversé et prend ladite configuration en dôme inversé stable, ce qui force le produit (34) à venir en contact étroit avec le couvercle (26) en réduisant l'espace supérieur (50) présent entre le produit (34) et le couvercle (26), le couvercle (26) conservant sa configuration de forme générale plate.
  2. Procédé selon la revendication 1, selon lequel l'étape de fermeture étanche est obtenue par application du couvercle (26) de façon étanche sur le corps du conteneur au niveau d'une surface d'étanchéité (22) du conteneur.
  3. Procédé selon la revendication 2, selon lequel, le couvercle (26) est situé au voisinage de la surface d'étanchéité (22), et une section formant rebord (24) du corps (10) du conteneur avant que l'espace supérieur (50) soit éliminé.
  4. Procédé selon la revendication 3, selon lequel le couvercle (26) est supporté par une gorge (27) dudit conteneur, ménagée dans ladite section formant rebord (24) et dans ladite surface d'étanchéité (22).
  5. Procédé selon l'une quelconque des revendications précédentes, selon lequel le couvercle (26) est formé d'une matière non plastique résistante à une perforation.
  6. Procédé selon l'une quelconque des revendications 1 à 4, selon lequel le couvercle (26) est formé d'une matière plastique résistante à une perforation.
  7. Procédé selon l'une quelconque des revendications précédentes, selon lequel le produit chargé est suffisamment liquide ou mobile pour ne pas tendre à prendre une forme naturelle spécifique quelconque.
  8. Procédé selon l'une quelconque des revendications précédentes, comportant en outre l'évacuation du gaz dans la chambre à vide (38) et dans le conteneur (10) de sorte que la pression du gaz dans l'espace supérieur à l'intérieur du conteneur (10) est réduite à celle de la chambre à vide (38).
  9. Procédé selon l'une quelconque des revendications précédentes, comportant en outre le positionnement du conteneur (10) dans la chambre sous vide (38) au-dessous d'un élément de tête d'étanchéité (40).
  10. Procédé selon la revendication 9, comprenant en outre l'abaissement de l'élément de tête d'étanchéité (40) à l'intérieur de la chambre à vide (38) lorsque le niveau de vide désiré est obtenu, de sorte que l'élément de tête d'étanchéité (40) s'applique sur ledit couvercle (26) de manière à appliquer de façon étanche ledit couvercle sur la surface d'étanchéité (22) du conteneur (10).
  11. Procédé selon l'une quelconque des revendications précédentes, selon lequel la partie déformable peut être inversée en étant dirigée vers l'intérieur sous l'effet d'une poussée mécanique lorsque la chambre (38) est ramenée à la pression atmosphérique, ce qui force le produit à remplir les vides de l'espace supérieur (50).
  12. Procédé selon l'une quelconque des revendications précédentes et comprenant en outre le montage de la surface d'étanchéité (22) dudit conteneur (10) dans l'environnement de vide, le long d'un bord avant (28) d'une enclume (30).
  13. Procédé de remplissage et de fermeture étanche d'un conteneur bistable selon la revendication 1, caractérisé en outre en ce que:
       ledit couvercle de forme générale plate (26) est disposé au voisinage d'une surface d'étanchéité (22) et d'une section formant rebord (24) dudit conteneur;
       le conteneur (10) est placé dans la chambre à vide (38) au-dessous d'un élément de tête d'étanchéité (40);
       la surface d'étanchéité (22) dudit conteneur (10) est mise en place à l'intérieur de ladite chambre à vide (38) le long d'un bord avant (28) d'une enclume (30):
       on vide le gaz situé dans ladite chambre à vide (38) et dans le conteneur (10) de sorte que ladite pression de l'air situé dans l'espace supérieur à l'intérieur dudit conteneur est réduite à la pression de ladite chambre à vide (38); et
       on abaisse ledit élément de tête d'étanchéité (40) à l'intérieur de ladite chambre à vide (38) lorsque le niveau de vide désiré est atteint de sorte que l'élément de tête d'étanchéité (40) applique de façon étanche le couvercle (26) sur ladite surface d'étanchéité (22) dudit conteneur (10).
  14. Procédé de remplissage et de fermeture étanche d'un conteneur bistable semi-rigide (10) selon la revendication 1, caractérisé en outre en ce qu'on évacue le gaz situé dans l'espace supérieur par balayage avec de la vapeur; qu'on laisse refroidir l'espace supérieur (50) et que la vapeur se condense en eau ce qui conduit à la formation d'un vide à l'intérieur de l'espace supérieur (50).
  15. Conteneur comportant un couvercle de forme générale plate (26) fixé de façon étanche audit boîtier (10) du conteneur de manière à recouvrir un produit (34) situé à l'intérieur dudit boîtier du conteneur (10), ledit conteneur étant caractérisé en ce que :
       un boîtier semi-rigide (10) du conteneur est prévu de manière à recevoir un produit (34) qui y est introduit selon un volume inférieur à celui du volume du conteneur mais égal au volume introduit à un tel niveau définissant une ouverture supérieure (50); et
       ledit boîtier semi-rigide (10) du conteneur possédant des bords latéraux rigides (18) entourant un fond flexible bistable et non nervuré (12) possédant une épaisseur de paroi continue et comportant un élément en forme d'anneau (16) entourant les bords latéraux (18) du boîtier (10) du conteneur, et étant déplaçable entre une première position, dans laquelle ledit fond (12) du conteneur est amené dans une position stable déployée vers le bas et reste dans cette position, tandis que le produit (34) est introduit dans le boîtier (10) du conteneur dans un environnement de vide, et une seconde position, dans laquelle ledit fond non nervuré (12) est inversé dans une configuration stable en forme de dôme inversé lorsque la contrainte de l'anneau dépasse la contrainte de flexion autour du fond non nervuré (12) lors du retour à la pression atmosphérique, ce qui a pour effet de forcer le produit (34) à venir en contact étroit avec le couvercle (26) en réduisant l'ouverture supérieure (50) située entre le produit (34) et le couvercle (26), le couvercle (26) conservant sa configuration de forme générale plate.
EP89911514A 1988-09-14 1989-09-13 Procede de remplissage et de fermeture hermetique d'un conteneur deformable Expired - Lifetime EP0434764B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US24482988A 1988-09-14 1988-09-14
US244829 1988-09-14
PCT/US1989/003987 WO1990002687A1 (fr) 1988-09-14 1989-09-13 Procede de remplissage et de fermeture hermetique d'un conteneur deformable
CA002038380A CA2038380C (fr) 1988-09-14 1991-03-15 Methode de remplissage et de bouchage d'un contenant souple

Publications (3)

Publication Number Publication Date
EP0434764A1 EP0434764A1 (fr) 1991-07-03
EP0434764A4 EP0434764A4 (en) 1991-08-28
EP0434764B1 true EP0434764B1 (fr) 1994-07-06

Family

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Family Applications (1)

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EP89911514A Expired - Lifetime EP0434764B1 (fr) 1988-09-14 1989-09-13 Procede de remplissage et de fermeture hermetique d'un conteneur deformable

Country Status (7)

Country Link
EP (1) EP0434764B1 (fr)
JP (1) JP2742954B2 (fr)
AT (1) ATE108156T1 (fr)
AU (1) AU632765B2 (fr)
CA (1) CA2038380C (fr)
DE (1) DE68916647T2 (fr)
WO (1) WO1990002687A1 (fr)

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DK9400340U3 (da) * 1994-09-06 1995-05-26 Torben Boedtker Emballage til spiseis
GB2337746B (en) * 1998-05-26 2002-09-18 Linpac Plastics Ltd Sealed container
GB9821225D0 (en) * 1998-10-01 1998-11-25 Shetland Seafood Specialities Method
AU2002953207A0 (en) * 2002-12-09 2003-01-02 Amcor Limited A container
AU2003285992B2 (en) * 2002-12-09 2011-03-03 Impress Australia Pty Ltd A container with a flexible bottom wall
FR2856657B1 (fr) * 2003-06-30 2005-09-23 Bonduelle Sa Ets Procede et installation de conditionnement de produits alimentaires sous atmosphere modifiee.
KR100947895B1 (ko) * 2008-01-30 2010-03-18 김가은 외부형상이 변하며 재사용이 가능한 진공보관용기와 그밀폐뚜껑
KR101278451B1 (ko) * 2012-02-17 2013-07-01 조성오 백-인-박스 방식의 포장시스템
CN109204978A (zh) * 2018-07-27 2019-01-15 福建元弘自动化科技有限公司 节噪型多功能的包装装置
JP2021102164A (ja) * 2019-07-18 2021-07-15 株式会社大協精工 医療用機器コンテナー

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Publication number Priority date Publication date Assignee Title
US4796411A (en) * 1986-05-06 1989-01-10 Prima Meat Packers, Ltd. Research And Development Center Packaging food in raised state

Also Published As

Publication number Publication date
DE68916647T2 (de) 1994-11-03
AU632765B2 (en) 1993-01-14
CA2038380C (fr) 1997-04-01
CA2038380A1 (fr) 1992-09-16
ATE108156T1 (de) 1994-07-15
AU4342789A (en) 1990-04-02
DE68916647D1 (de) 1994-08-11
JP2742954B2 (ja) 1998-04-22
EP0434764A4 (en) 1991-08-28
JPH04500651A (ja) 1992-02-06
WO1990002687A1 (fr) 1990-03-22
EP0434764A1 (fr) 1991-07-03

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