EP0853578B1 - Method for sealing a container with a lid by crimping and heat sealing - Google Patents
Method for sealing a container with a lid by crimping and heat sealing Download PDFInfo
- Publication number
- EP0853578B1 EP0853578B1 EP96933465A EP96933465A EP0853578B1 EP 0853578 B1 EP0853578 B1 EP 0853578B1 EP 96933465 A EP96933465 A EP 96933465A EP 96933465 A EP96933465 A EP 96933465A EP 0853578 B1 EP0853578 B1 EP 0853578B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- lid
- lining
- lacquer
- film
- 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
Links
- 238000002788 crimping Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 21
- 238000007789 sealing Methods 0.000 title claims description 14
- 238000004806 packaging method and process Methods 0.000 claims description 24
- 239000012815 thermoplastic material Substances 0.000 claims description 15
- 229920001169 thermoplastic Polymers 0.000 claims description 14
- 239000004416 thermosoftening plastic Substances 0.000 claims description 14
- 229920000098 polyolefin Polymers 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000005499 meniscus Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 239000004922 lacquer Substances 0.000 claims 11
- 239000008187 granular material Substances 0.000 claims 3
- 150000001336 alkenes Chemical class 0.000 claims 1
- 239000003822 epoxy resin Substances 0.000 claims 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 238000000576 coating method Methods 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 239000002966 varnish Substances 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 10
- 208000031968 Cadaver Diseases 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000001954 sterilising effect Effects 0.000 description 6
- 238000004659 sterilization and disinfection Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000021148 salty food Nutrition 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
- B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls
- B65D7/36—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls formed by rolling, or by rolling and pressing
-
- 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
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2842—Securing closures on containers
- B65B7/2878—Securing closures on containers by heat-sealing
Definitions
- the invention relates to the field of rigid packaging or semi-rigid formed by containers, typically body of boxes, closed by crimped lids.
- the invention relates more specifically to a method of container closure comprising crimping and heat sealing the cover and the body of the box.
- the crimping includes the formation of a double hook by winding of the edge of the cover and the crimping edge of the body box, double hook obtained by several sets of knobs crimping.
- the closure of semi-rigid containers i.e. the metal wall thickness is of the order of 0.10 mm up to 0.15 mm, uses either the technique of heat sealing, either by crimping a cover.
- the problem posed concerns the final quality of containers filled with packaged products as they are delivered to consumers. This final quality is partly linked to the lid and to the crimping of the lid and the box body once filled.
- a first object of the invention is constituted by a process as defined by claim 1.
- the heat sealing operation can be after the crimping process, as shown in Figures 1a to 1d, or simultaneously with that of crimping.
- said inner coating of said container and that of said cover externally comprises a thermoplastic film, the thermoplastic film of said container and that of said cover being heat-sealable.
- This thermoplastic film can be a polyolefin film from 5 to 50 ⁇ m thick.
- PP polypropylene
- one of said interior coatings comprises a thermoplastic film
- the other of said interior coatings comprises a heat-sealable varnish to said thermoplastic film.
- said thermoplastic film is a polyolefin and said varnish is a varnish loaded with grains of a thermoplastic material heat sealable with said polyolefin.
- Said polyolefin can be PP and said varnish can be an epoxy varnish.
- said container is coated internally with said varnish
- said cover is coated internally with said polyolefin, but one can also have the reverse, said container being coated internally with said polyolefin, and said cover being coated internally with said varnish.
- a second object of the invention consists of the packages obtained according to the method of the invention (claim 11).
- This packaging containing a product to be packaged, formed by a metal container comprising a skirt and a dropped edge, and a metal cover comprising a bowl and a crimping edge, said cover being crimped to said container, is characterized in that the internal coating of said cover is heat sealed to the inner lining of said container.
- the opposite parts, heat-sealed, of the interior coatings of said cover and of said container terminate in a peripheral meniscus ensuring the joining of said bowl and said skirt.
- said container and / or said cover are metallic, the thickness of metal being between 0.10 and 0.25 mm.
- Said metal may be aluminum or aluminum alloys, or steel, the container may be made of a material different from that of the cover.
- said container can be made of steel and said lid in aluminium.
- Said internal coating of said container and of said lid can be chosen from films of thermoplastic material, or varnishes containing grains of thermoplastic material.
- Said inner coating of said container and said inner coating of said lid can both be films of thermoplastic material, preferably films of polyolefin.
- said interior coating of said container can be a varnish containing grains of thermoplastic material and said interior coating of said cover can be a film of thermoplastic material heat-sealable to said varnish.
- said film of thermoplastic material has a thickness of 10 to 50 ⁇ m, and said varnish has a thickness of 3 to 15 ⁇ m.
- the invention relates more particularly to containers of the type box body or trays, with a lid which can be or not with easy opening.
- the invention in addition to solving all of the problems posed, and which will not be repeated here, also allows expand the technical possibilities of packaging to crimped lids, in particular in the field of clothing mechanics of the cover, and in that of the resistance to corrosion. These possibilities can, for equal performances, allow to reduce the thickness of these covers, and therefore their material cost.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Closing Of Containers (AREA)
Description
L'invention concerne le domaine des emballages rigides ou semi-rigides constitués par des récipients, typiquement des corps de boítes, fermés par des couvercles sertis. L'invention est plus spécifiquement relative à un procédé de fermeture de récipient comprenant un sertissage et un thermoscellage du couvercle et du corps de boíte.The invention relates to the field of rigid packaging or semi-rigid formed by containers, typically body of boxes, closed by crimped lids. The invention relates more specifically to a method of container closure comprising crimping and heat sealing the cover and the body of the box.
Selon la pratique industrielle la plus courante, la fermeture
étanche de récipients métalliques rigides (corps de boítes,
soit emboutis en une pièce, soit soudés en deux pièces), c'est
à dire dont l'épaisseur de paroi métallique est de l'ordre de
0,15 à 0,25 mm, est réalisée par sertissage de couvercles
dotés d'un joint périphérique, comme représenté aux figures de
la planche 1.According to the most common industrial practice, closing
waterproof rigid metal containers (body of boxes,
either stamped in one piece, or welded in two pieces),
ie with a metal wall thickness of the order of
0.15 to 0.25 mm, is made by crimping covers
with a peripheral seal, as shown in the
Le sertissage comprend la formation d'un double crochet par enroulement du bord du couvercle et du bord à sertir du corps de boíte, double crochet obtenu par plusieurs jeux de molettes de sertissage.The crimping includes the formation of a double hook by winding of the edge of the cover and the crimping edge of the body box, double hook obtained by several sets of knobs crimping.
La fermeture de récipients semi-rigides, c'est à dire dont l'épaisseur de paroi métallique est de l'ordre de 0,10 mm jusqu'à 0,15 mm, fait appel soit à la technique du thermoscellage, soit au sertissage d'un couvercle.The closure of semi-rigid containers, i.e. the metal wall thickness is of the order of 0.10 mm up to 0.15 mm, uses either the technique of heat sealing, either by crimping a cover.
Le problème posé concerne la qualité finale des récipients
garnis de produits conditionnés tels qu'ils sont livrés aux
consommateurs.
Cette qualité finale est pour une part liée au couvercle et au
sertissage du couvercle et du corps de boíte une fois rempli.The problem posed concerns the final quality of containers filled with packaged products as they are delivered to consumers.
This final quality is partly linked to the lid and to the crimping of the lid and the box body once filled.
En effet, il y a au moins 3 problèmes différents en relation avec le couvercle ou le sertissage:
- d'une part, le fabricant de couvercle est confronté à un
problème de formation du joint sur les couvercles:
- * les cadences de mise en forme du couvercle augmentent avec les progrès de la technologie mécanique et de l'automation.
- * le dépôt du joint reste conditionné par un écoulement d'un
joint liquide à travers un orifice en mouvement relatif par
rapport au couvercle, avec des ouvertures et fermetures de
l'orifice pour chaque couvercle.
Les irrégularités de dépôt et incidents de fabrication nécessitent un contrôle strict du dépôt du joint. En effet, un manque de joint signifie ultérieurement une contamination bactérienne possible du contenu du récipient, avec les conséquences éventuellement très graves qui peuvent en découler. - d'autre part, le sertissage reste une opération critique pour les mêmes raisons que celles vue précédemment (risque de contamination bactérienne si le sertissage est insuffisant, c'est à dire si le recouvrement des crochets du bord du couvercle et du bord à sertir est insuffisant).
- par ailleurs, le couvercle une fois serti joue un grand rôle, tout comme le fond du récipient, lors de la phase de traitement thermique, typiquement la stérilisation à haute température, par exemple entre 110 et 130°C. Compte tenu de la pression développée durant la stérilisation, il se produit une déformation des éléments les moins rigides de l'emballage, à savoir le fond et le couvercle. Bien que ces éléments soient conçus pour admettre des déformations réversibles, c'est à dire essentiellement grâce à des effets de charnière qui font que les partie sorties à haute température rentrent et reprennent leur position au refroidissement, il n'en reste pas moins vrai qu'il se produit assez régulièrement des déformations irréversibles (appelées "facettes" ou "becquets") qui rendent le produit non commercialisable.
- enfin, toutes les études de corrosion montrent que le couvercle est une partie de l'emballage souvent corrodée, ce qui peut réduire considérablement la durée de vie de l'emballage.
- on the one hand, the lid manufacturer is faced with a problem of formation of the seal on the lids:
- * the rates of formatting of the lid increase with the progress of mechanical technology and automation.
- * the deposition of the seal remains conditioned by a flow of a liquid seal through an orifice in movement relative to the cover, with openings and closings of the orifice for each cover.
Deposition irregularities and manufacturing incidents require strict control of the deposition of the seal. Indeed, a lack of seal subsequently means possible bacterial contamination of the contents of the container, with the possibly very serious consequences which may result therefrom. - on the other hand, the crimping remains a critical operation for the same reasons as those seen previously (risk of bacterial contamination if the crimping is insufficient, that is to say if the covering of the hooks of the edge of the cover and of the edge to be crimped is insufficient).
- moreover, the lid once crimped plays a large role, like the bottom of the container, during the heat treatment phase, typically sterilization at high temperature, for example between 110 and 130 ° C. Given the pressure developed during sterilization, there is a deformation of the less rigid elements of the packaging, namely the bottom and the lid. Although these elements are designed to admit reversible deformations, that is to say essentially thanks to hinge effects which cause the parts taken out at high temperature to return and resume their position on cooling, the fact remains that 'there are fairly regular irreversible deformations (called "facets" or "spoilers") which make the product non-marketable.
- Finally, all corrosion studies show that the cover is a part of the packaging that is often corroded, which can considerably reduce the lifetime of the packaging.
En conclusion, la demanderesse a recherché les moyens pour résoudre simultanément l'ensemble de ces problèmes.In conclusion, the plaintiff sought the means to solve all of these problems simultaneously.
Un premier objet de l'invention est constitué par un procédé
tel que défini par la revendication 1.A first object of the invention is constituted by a process
as defined by
Selon une modalité préférée de l'invention, on forme, par thermoscellage dudit revêtement intérieur dudit récipient avec ledit revêtement intérieur dudit couvercle, un ménisque de matière assurant la soudure des revêtements intérieurs dudit récipient et dudit couvercle et formant une jonction de ladite cuvette et de ladite jupe. According to a preferred form of the invention, by heat-sealing said interior coating of said container with said inner lining of said cover, a meniscus of material ensuring the welding of the interior coatings of said container and said lid and forming a junction of said bowl and said skirt.
L'ensemble de ces moyens permet de résoudre l'ensemble des
problèmes posés.
En effet, d'une part, il n'est plus nécessaire d'utiliser un
couvercle avec joint, sans pour autant perdre l'étanchéité de
l'emballage final, après sertissage et thermoscellage du
couvercle et du récipient.
D'autre part, il a été observé, après remplissage de
l'emballage et stérilisation, une très grande diminution des
rebuts par déformation irréversible des emballages.
Enfin, les études de corrosion sur emballages avec produits
conditionnés selon l'invention ont montré une nette
augmentation de la durée de vie, comparativement à des
emballages avec couvercle serti traditionnel.All of these means make it possible to solve all of the problems posed.
On the one hand, it is no longer necessary to use a cover with a seal, without losing the tightness of the final packaging, after crimping and heat-sealing the cover and the container.
On the other hand, it has been observed, after filling the packaging and sterilization, a very large reduction in rejects by irreversible deformation of the packaging.
Finally, corrosion studies on packaging with products packaged according to the invention have shown a marked increase in shelf life, compared to packaging with a traditional crimped cover.
L'ensemble de ces résultats est, semble-t-il, lié à la présence simultanée d'un sertissage qui assure la fixation mécanique du couvercle au récipient et en partie l'étanchéité, et d'un thermoscellage qui assure aussi l'étanchéité, qui rend solidaires le haut de jupe dudit récipient et la partie correspondante, relativement verticale, du bord à sertir du couvercle.All of these results seem to be linked to the simultaneous presence of a crimp which ensures the fixing mechanically from the lid to the container and partly the seal, and a heat seal which also seals, which makes integral with the top of the skirt of said container and the part corresponding, relatively vertical, from the crimp edge of the lid.
Les figures 1a à 1d illustrent le procédé selon l'invention.
On a représenté, en pointillés, la position du couvercle avant stérilisation.
The position of the cover before sterilization is shown in dotted lines.
Selon l'invention, l'opération de thermoscellage peut être effectuée après celle de sertissage, comme représenté aux figures 1a à 1d, ou simultanément à celle de sertissage.According to the invention, the heat sealing operation can be after the crimping process, as shown in Figures 1a to 1d, or simultaneously with that of crimping.
Selon une première modalité de l'invention, ledit revêtement
intérieur dudit récipient et celui dudit couvercle comprend
extérieurement un film thermoplastique, le film
thermoplastique dudit récipient et celui dudit couvercle étant
thermoscellables.
Ce film thermoplastique peut être un film de polyoléfine de 5
à 50 µm d'épaisseur.
Comme polyléfine, on peut prendre le PP (polypropylène). According to a first embodiment of the invention, said inner coating of said container and that of said cover externally comprises a thermoplastic film, the thermoplastic film of said container and that of said cover being heat-sealable.
This thermoplastic film can be a polyolefin film from 5 to 50 μm thick.
As a polyolefin, PP (polypropylene) can be used.
Selon une autre modalité de l'invention, un desdits
revêtements intérieurs comprend un film thermoplastique,
l'autre desdits revêtements intérieurs comprend un vernis
thermoscellable audit film thermoplastique.
Dans ce cas, ledit film thermoplastique est une polyoléfine et
ledit vernis est un vernis chargé de grains d'une matière
thermoplastique thermoscellable avec ladite polyoléfine.
Ladite polyoléfine peut être du PP et ledit vernis peut être
un vernis époxy.
De préférence, ledit récipient est revêtu intérieurement dudit
vernis, et ledit couvercle est revêtu intérieurement de ladite
polyoléfine, mais on peut aussi avoir l'inverse, ledit
récipient étant revêtu intérieurement de ladite polyoléfine,
et ledit couvercle étant revêtu intérieurement dudit vernis.According to another embodiment of the invention, one of said interior coatings comprises a thermoplastic film, the other of said interior coatings comprises a heat-sealable varnish to said thermoplastic film.
In this case, said thermoplastic film is a polyolefin and said varnish is a varnish loaded with grains of a thermoplastic material heat sealable with said polyolefin.
Said polyolefin can be PP and said varnish can be an epoxy varnish.
Preferably, said container is coated internally with said varnish, and said cover is coated internally with said polyolefin, but one can also have the reverse, said container being coated internally with said polyolefin, and said cover being coated internally with said varnish.
Un deuxième objet de l'invention est constitué par les
emballages obtenus selon le procédé de l'invention (revendication 11).
Cet emballage contenant un produit à conditionner, formé par
un récipient métallique comprenant une jupe et un bord tombé, et un
couvercle métallique comprenant une cuvette et un bord à sertir, ledit
couvercle étant serti audit récipient, est caractérisé en ce
que le revêtement intérieur dudit couvercle est
thermoscellé au revêtement intérieur dudit
récipient.
Les parties en regard, thermoscellées, des révêtements
intérieurs dudit couvercle et dudit récipient se terminent par
un ménisque périphérique assurant la jonction de ladite
cuvette et de ladite jupe.A second object of the invention consists of the packages obtained according to the method of the invention (claim 11). This packaging containing a product to be packaged, formed by a metal container comprising a skirt and a dropped edge, and a metal cover comprising a bowl and a crimping edge, said cover being crimped to said container, is characterized in that the internal coating of said cover is heat sealed to the inner lining of said container.
The opposite parts, heat-sealed, of the interior coatings of said cover and of said container terminate in a peripheral meniscus ensuring the joining of said bowl and said skirt.
Selon l'invention, ledit récipient et/ou ledit couvercle sont
métalliques, l'épaisseur de métal étant comprise entre 0,10 et
0,25 mm.
Ledit métal peut être l'aluminium ou les alliages d'aluminium,
ou l'acier, le récipient pouvant être en un matériau différent
de celui du couvercle. According to the invention, said container and / or said cover are metallic, the thickness of metal being between 0.10 and 0.25 mm.
Said metal may be aluminum or aluminum alloys, or steel, the container may be made of a material different from that of the cover.
Ainsi, ledit récipient peut être en acier et ledit couvercle en aluminium.Thus, said container can be made of steel and said lid in aluminium.
Ledit revêtement intérieur dudit récipient et dudit couvercle
peuvent être choisis parmi les films de matière
thermoplastique, ou les vernis contenant des grains de matière
thermoplastique.
Ledit revêtement intérieur dudit récipient et ledit revêtement
intérieur dudit couvercle peuvent être tous deux des films de
matière thermoplastique, de préférence des films de
polyoléfine.
Selon une autre variante, ledit revêtement intérieur dudit
récipient peut être un vernis contenant des grains de matière
thermoplastique et ledit revêtement intérieur dudit couvercle
peut être un film de matière thermoplastique thermoscellable
audit vernis.Said internal coating of said container and of said lid can be chosen from films of thermoplastic material, or varnishes containing grains of thermoplastic material.
Said inner coating of said container and said inner coating of said lid can both be films of thermoplastic material, preferably films of polyolefin.
According to another variant, said interior coating of said container can be a varnish containing grains of thermoplastic material and said interior coating of said cover can be a film of thermoplastic material heat-sealable to said varnish.
Selon l'invention, ledit film de matière thermoplastique présente une épaisseur de 10 à 50 µm, et ledit vernis présente une épaisseur de 3 à 15 µm.According to the invention, said film of thermoplastic material has a thickness of 10 to 50 μm, and said varnish has a thickness of 3 to 15 µm.
L'invention concerne plus spécialement des récipients du type corps de boíte ou barquettes, avec un couvercle qui peut être ou non à ouverture facile.The invention relates more particularly to containers of the type box body or trays, with a lid which can be or not with easy opening.
On a réalisé des essais, selon l'invention et selon l'état de
la technique (essais comparatifs):
- essais sur des corps de boítes et couvercles de format
commercial dit "1/4 - diamètre 63 mm".
La hauteur des boítes est de : 73,6 mm. - corps de boítes et couvercles en alliage d'aluminium 5052 (désignation selon l'Aluminum Association), en épaisseur de 0,25 mm pour le corps de boíte et de 0,225 mm pour le couvercle.
- revêtement intérieur des corps de boíte et couvercles : vernis époxy à 5 g/m2
- couvercles "standard" avec joint
- revêtement intérieur des corps de boíte et couvercless :
couche de PP de 25 µm rendue adhérente à la couche métallique Al par une couche adhésive à base de copolymère PP à groupements acides carboxyliques, - couvercles "standard" sans joint
Les couvercles sont sertis sur les corps de boítes avec une sertisseuse à molettes selon la technique standard, de manière à former un crochet (9) tel que représenté à la figure 3 avec la courbe en pointillés.
Les couvercles ont été d'abord sertis de manière standard, puis, comme représenté aux figures 1a à 1d, on a thermoscellé le serti en appliquant un mors chauffant (14) sur le serti formé par la coopération du crochet (9) du couvercle et du bord tombé (4) du corps de boíte.
Conditions de thermoscellage:
- pression de 0,4 bar
- température du mors chauffant : 280°C
- température mesurée du serti : 210°C
- durées : 1 - 1,7 - 2 - 2,5 s
Il n'a pas été noté de différences notables entre les essais où a varié la durée de tehrmoscellage (de 1 à 2,5 s).
Une "facette" désigne une déformation dans le plan du couvercle.
Un "becquet" désigne une déformation (plus grave que la précédente) qui touche aussi la périphérie du couvercle et donc le serti.
Les essais comparatifs ont montré que la présence d'un ménisque de matière thermoplastique diminue la corrosion qui peut prendre naissance dans l'espace confiné compris entre la pente intérieure (8) du couvercle et le haut de la jupe (3) du récipient. Cette amélioration de la tenue à la corrosion due au contenu (présence d'aliments acides / salés, etc...) permet d'augmenter la durée de vie des emballages.
Il ne fait pas de doute que la formation d'un ménisque de matière thermoplastique (12) modifie et améliore le comportement mécanique du couvercle et sa tenue à la corrosion.
- tests on bodies of boxes and covers of commercial format called "1/4 - diameter 63 mm".
The height of the boxes is: 73.6 mm. - body of boxes and lids in aluminum alloy 5052 (designation according to the Aluminum Association), 0.25 mm thick for the box body and 0.225 mm for the cover.
- inner coating of box bodies and lids: 5 g / m2 epoxy varnish
- "standard" covers with seal
- inner coating of box bodies and covers:
25 µm PP layer made adherent to the metallic layer Al by an adhesive layer based on PP copolymer with carboxylic acid groups, - "standard" covers without seal
The covers are crimped on the body of boxes with a crimping machine with rollers according to the standard technique, so as to form a hook (9) as shown in Figure 3 with the dotted curve.
The covers were first crimped in a standard manner, then, as shown in FIGS. 1a to 1d, the crimp was heat sealed by applying a heating jaw (14) to the crimp formed by the cooperation of the hook (9) of the cover and of the fallen edge (4) of the box body.
Heat sealing conditions:
- pressure of 0.4 bar
- heated jaw temperature: 280 ° C
- measured seam temperature: 210 ° C
- durations: 1 - 1.7 - 2 - 2.5 s
No significant differences were noted between the trials in which the duration of tehrmosealing varied (from 1 to 2.5 s).
A "facet" designates a deformation in the plane of the cover.
A "spoiler" designates a deformation (more serious than the previous one) which also affects the periphery of the cover and therefore the crimp.
Comparative tests have shown that the presence of a meniscus of thermoplastic material reduces corrosion which can arise in the confined space between the inner slope (8) of the cover and the top of the skirt (3) of the container. This improvement in the corrosion resistance due to the content (presence of acidic / salty foods, etc.) makes it possible to increase the shelf life of the packaging.
There is no doubt that the formation of a meniscus of thermoplastic material (12) modifies and improves the mechanical behavior of the cover and its resistance to corrosion.
L'invention, outre qu'elle permet de résoudre l'ensemble des problèmes posés, et qui ne seront pas repris ici, permet aussi d'élargir les possibilités techniques des emballages à couvercles sertis, en particulier dans le domaine de la tenue mécanique du couvercle, et dans celui de la tenue à la corrosion. Ces possibilités peuvent, à performances égales, permettre de réduire l'épaisseur de ces couvercles, et donc leur coût matière.The invention, in addition to solving all of the problems posed, and which will not be repeated here, also allows expand the technical possibilities of packaging to crimped lids, in particular in the field of clothing mechanics of the cover, and in that of the resistance to corrosion. These possibilities can, for equal performances, allow to reduce the thickness of these covers, and therefore their material cost.
Claims (20)
- Method for closing a metal container comprising a skirt and a flange, with a metal lid comprising a depression and a rim to be crimped, comprising supply of container and lid, crimping the rim of said lid to the flange of said container, so as to form at least one crimping loop, characterized in that,a) said supplied lid is seal-free, said supplied container and lid each comprising a lining selected so that the lining of one can be heat sealed with the lining of the other,b) after crimping said lid and said container, said lining of said container is heat sealed to said lining of said lid.
- Method according to claim 1, wherein a meniscus is formed by heat sealing said lining of said container to said lining of said lid, which provides welding of the linings of said container and said lid and forms a junction between said depression and said skirt.
- Method according to either of claims 1 and 2, wherein the heat sealing operation is conducted after or simultaneously with the crimping operation.
- Method according to any of claims 1 to 3, wherein said lining of said container and that of said lid comprise an inner thermoplastic film, the thermoplastic film of said container and that of said lid being heat sealing.
- Method according to claim 4, wherein said thermoplastic film is a polyolefin film of 5 to 50 µm thickness.
- Method according to claim 5, wherein said thermoplastic film is a PP film.
- Method according to any of claims 1 to 3, wherein one of said linings comprises a thermoplastic film, the other of said linings comprising a lacquer heat-sealable with said thermoplastic film.
- Method according to claim 7, wherein said thermoplastic film is a polyolefin, and said lacquer is a lacquer containing granules of said polyolefin, in such manner that said lacquer is heat-sealable with said film.
- Method according to claim 8, wherein said olefin is PP and said lacquer is an epoxy resin based lacquer.
- Method according to any of claims 7 to 9, wherein said container is lined with said polyolefin film, and said lid is lined with said lacquer.
- Packaging containing a packaged product, formed by a metal container comprising a skirt and a flange, and by a lid comprising a depression and a rim to be crimped, said lid being crimped to said container, and characterized in that the lining of said lid is heat-sealable with the lining of said container.
- Packaging according to claim 11, wherein the heat sealed junction between the linings of said lid and of said container form a peripheral meniscus providing a junction between said depression and said skirt.
- Packaging according to either of claims 11 and 12, wherein the metal thickness of said container and said lid ranges from 0.10 to 0.25 mm.
- Packaging according to claim 13, wherein said metal is aluminum or aluminum alloys, or steel, the container being possibly made of a different material to that of the lid.
- Packaging according to claim 14, wherein said container is in steel and said lid is in aluminum.
- Packaging according to claims 11 to 15, wherein said lining of said container and of said lid are selected among films of thermoplastic material or among lacquers containing granules of thermoplastic material.
- Packaging according to with claims 11 to 16, wherein said lining of said container and that of said lid are films in thermoplastic material, preferably polyolefin films.
- Packaging according to with any of claims 11 to 16, wherein said lining of said container is a lacquer containing granules of thermoplastic material, and said lining of said lid is a film in thermoplastic material that can be heat sealed with said lacquer.
- Packaging according to claim 16, wherein said thermoplastic film thickness ranges from 10 to 50 µm, and said lacquer thickness ranges from 3 to 15 µm.
- Packaging according to with any of claims 11 to 19, wherein said container is a can body or a tray, and wherein said lid may or may not have an easy opening.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9511751 | 1995-10-02 | ||
| FR9511751A FR2739354B1 (en) | 1995-10-02 | 1995-10-02 | METHOD FOR CLOSING A CONTAINER WITH A LID BY CRIMPING AND THERMAL SEALING |
| PCT/FR1996/001526 WO1997012808A1 (en) | 1995-10-02 | 1996-10-01 | Method for sealing a container with a lid by crimping and heat sealing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0853578A1 EP0853578A1 (en) | 1998-07-22 |
| EP0853578B1 true EP0853578B1 (en) | 1999-08-18 |
Family
ID=9483300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96933465A Expired - Lifetime EP0853578B1 (en) | 1995-10-02 | 1996-10-01 | Method for sealing a container with a lid by crimping and heat sealing |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0853578B1 (en) |
| AU (1) | AU7219096A (en) |
| CZ (1) | CZ100898A3 (en) |
| DE (1) | DE69603869T2 (en) |
| ES (1) | ES2136430T3 (en) |
| FR (1) | FR2739354B1 (en) |
| WO (1) | WO1997012808A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4446393C1 (en) | 1994-12-23 | 1995-12-21 | Schmalbach Lubeca | Applying sealing cpd. to can body and lid before making double seam joint |
| NL1008467C2 (en) * | 1998-03-04 | 1999-09-07 | Hoogovens Staal Bv | Method for the production of a thin-walled metal and a bus manufactured in this way. |
| US6348264B1 (en) | 1998-04-27 | 2002-02-19 | Roquette Freres | Process for producing low de starch hydrolysates by nanofiltration fractionation, products obtained thereby, and use of such products |
| DE10194904D2 (en) * | 2000-11-17 | 2003-11-06 | Schmalbach Lubeca | Long-term stability of a filling in a two-part beverage can |
| DE102013101224A1 (en) * | 2013-02-07 | 2014-08-07 | Jenoptik Automatisierungstechnik Gmbh | Laser transmission welding apparatus, laser transmission welding method, and a film sealed container therewith |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1536671A (en) * | 1975-02-22 | 1978-12-20 | Metal Box Co Ltd | Containers |
| US4264316A (en) * | 1979-06-29 | 1981-04-28 | Knudsen David S | Process for closing containers and foil membrane therefor |
| AU554618B2 (en) * | 1981-06-19 | 1986-08-28 | American National Can Corp. | Hot hilled container and method |
| JPH01213115A (en) * | 1988-02-09 | 1989-08-25 | Taiyo Fishery Co Ltd | Method and apparatus for vacuum sealing retort food can container |
| FR2692224B1 (en) * | 1992-06-16 | 1994-07-29 | Pechiney Emballage Alimentaire | METHOD FOR SEALING A NON-METALLIC CONTAINER WITH A PEELABLE AND REUSABLE NON-METALLIC COVER. |
-
1995
- 1995-10-02 FR FR9511751A patent/FR2739354B1/en not_active Expired - Fee Related
-
1996
- 1996-10-01 DE DE69603869T patent/DE69603869T2/en not_active Expired - Lifetime
- 1996-10-01 EP EP96933465A patent/EP0853578B1/en not_active Expired - Lifetime
- 1996-10-01 CZ CZ981008A patent/CZ100898A3/en unknown
- 1996-10-01 WO PCT/FR1996/001526 patent/WO1997012808A1/en not_active Application Discontinuation
- 1996-10-01 AU AU72190/96A patent/AU7219096A/en not_active Abandoned
- 1996-10-01 ES ES96933465T patent/ES2136430T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0853578A1 (en) | 1998-07-22 |
| FR2739354B1 (en) | 1997-10-24 |
| DE69603869T2 (en) | 2000-02-10 |
| FR2739354A1 (en) | 1997-04-04 |
| AU7219096A (en) | 1997-04-28 |
| CZ100898A3 (en) | 1999-01-13 |
| ES2136430T3 (en) | 1999-11-16 |
| WO1997012808A1 (en) | 1997-04-10 |
| DE69603869D1 (en) | 1999-09-23 |
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