EP2200809A2 - Method for pressurizing the interior of a thin-walled container, and resulting pressurized container - Google Patents

Method for pressurizing the interior of a thin-walled container, and resulting pressurized container

Info

Publication number
EP2200809A2
EP2200809A2 EP08842872A EP08842872A EP2200809A2 EP 2200809 A2 EP2200809 A2 EP 2200809A2 EP 08842872 A EP08842872 A EP 08842872A EP 08842872 A EP08842872 A EP 08842872A EP 2200809 A2 EP2200809 A2 EP 2200809A2
Authority
EP
European Patent Office
Prior art keywords
container
thin
pressurizing
walled
container according
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.)
Withdrawn
Application number
EP08842872A
Other languages
German (de)
French (fr)
Inventor
Jean-Tristan Outreman
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.)
Plastipak Packaging Inc
Original Assignee
Tecsor HR
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 Tecsor HR filed Critical Tecsor HR
Publication of EP2200809A2 publication Critical patent/EP2200809A2/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • 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
    • B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B3/02—Machines characterised by the incorporation of means for making the containers or receptacles
    • B65B3/022—Making containers by moulding of a thermoplastic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/42808—Filling the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6604—Thermal conditioning of the blown article
    • B29C49/6605—Heating the article, e.g. for hot fill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]

Definitions

  • the present invention relates to a method of pressurizing the interior of a thin-walled container to impart a high mechanical strength.
  • the invention also covers the pressurized container thus obtained with high mechanical strength.
  • Thin-walled containers are known for example in patent applications WO-O3 / 033361, EP-1468930 and EP-1527999.
  • the rigidity of such a thin-walled container poses another problem because these containers are conditioned at room temperature and when these containers are placed in a cold environment, there is a phenomenon of collapse which causes deformation of the container. Therefore, when the thin-walled containers are filled cold with flat liquids such as mineral water, oil, fruit juice, milk, it is necessary to use an aseptic working system, necessarily. Then, to meet the need for rigidity, it is planned to put these thin-walled containers under internal pressure by including the so-called method of nitrogen drop which is commonly used industrially. This method consists in introducing into the filled container of the liquid to be conditioned, a drop of liquid nitrogen, immediately before capping, in the headspace of the container.
  • the distribution means of this drop of nitrogen must be integrated in the chain and, therefore, they must be adapted to operate in an aseptic environment, which is a strong constraint: cleaning, sterilization, maintenance.
  • An additional station involves an additional source of failure to stop a chain on which the interventions are difficult and long because it is necessary to put all the conditions of aseptic packaging.
  • the liquid nitrogen at a strongly negative temperature, falls into the liquid at room temperature so that the drop of drop regularly causes splashing on the edges of the container.
  • the material used for the manufacture of thin-walled containers is often PET, polyethylene terephthalate, known for its transparency, its low weight and its great possibilities of conformation.
  • PET also allows a good conservation of the contained liquids.
  • the present invention provides a method of pressurizing the interior of a thin-walled container, filled cold and containing a flat liquid to improve the rigidity of said container before opening, a method that overcomes the problems mentioned above .
  • the thin-walled container is of the type manufactured in known manner by blowing from a preform.
  • This container has the necessary volume and searched.
  • the thin-walled container obtained has a weight ratio of material / wall surface of the order of 150 g / m 2 to 250 g / m 2 and more particularly 150 g / m 2 at 200 g / m 2 .
  • the method of pressurizing, according to the present invention, a thin-walled container for containing a flat liquid consists of the succession of the following steps:
  • This last so-called heating step of the wall is intended to heat only the wall taken in its thickness. This heat supply causes the relaxation of the stresses which had been frozen by the rapid cooling after deformation during manufacture.
  • the residual stresses are bi-oriented.
  • the container therefore tends to return to its original shape, that is to say that of the preform. Because of this tendency to a volume reduction, the interior of the container is pressurized and as the liquid is incompressible, the head space is compressed to a balance between the pressure exerted by the wall and the internal pressure.
  • Such heating can be achieved by means of a hot air projection on the periphery of the container for a short time. It is necessary to reach temperature point causing stress relaxation in the material, also known as the glass transition point.
  • the supply of heat energy must be important for a very short time.
  • the PET which is bad conductor of the heat, absorbs the calories brought by the hot air, which leads to a fast release of the stresses and avoids the transmission of the calories to the liquid or at least renders totally negligible the quantity of calories transmitted .
  • the internal pressurization according to the method of the present invention also makes it possible to compensate for the pressure decrease, which is small but may exist, related to the loss of a part of the liquid due to the permeability of the walls, these walls being very thin.
  • the pressurization of the inside of the container also makes it possible to compensate for the collapse due to a decrease in temperature between the conditioning temperature and the storage temperature, before opening.
  • Thin-walled containers thus produced having wall thicknesses such as the weight ratio of material / surface is between 150g / m 2 and 250g / m 2 , more particularly between 150 g / m 2 and 200 g / m 2 , can withstand significant loads because of their greatly improved rigidity, including such containers can be palletized and the pallets can themselves be stacked.
  • Heating which is indicated that a preferred embodiment is that of hot air may also use infrared heaters.
  • the material concerned is PET because it is currently the most used but any suitable material for making a container, likely to have residual stresses, come from deformation, is concerned by the present invention.

Abstract

The subject of the invention is a method of pressurizing a thin-walled container designed to contain a flat liquid, characterized in that it consists in the following series of steps: making a thin-walled container in which residual stresses are set up; filling this container with said flat liquid at a cold temperature; sealing the container after filling it; and heating the wall of the container without raising the temperature of the liquid, to reach the temperature of relaxation of said stresses in such a way that the interior of said container is pressurized. The invention also covers the container produced in this way.

Description

PROCEDE DE MISE EN PRESSION DE L'INTERIEUR D'UN CONTENANT A PAROI MINCE, CONTENANT SOUS PRESSION OBTENU METHOD FOR PRESSURIZING THE INTERIOR OF A THIN-FILM CONTAINER CONTAINING PRESSURIZED PRESSURE
La présente invention concerne un procédé de mise en pression de l'intérieur d'un contenant à paroi mince, pour lui conférer une forte résistance mécanique. L'invention couvre également le contenant sous pression ainsi obtenu à forte résistance mécanique. Les contenants à paroi mince sont connus par exemple dans les demandes de brevet WO-O3/O33361, EP-1468930 et EP-1527999.The present invention relates to a method of pressurizing the interior of a thin-walled container to impart a high mechanical strength. The invention also covers the pressurized container thus obtained with high mechanical strength. Thin-walled containers are known for example in patent applications WO-O3 / 033361, EP-1468930 and EP-1527999.
Ces contenants sont très attractifs pour les petits volumes inférieurs à 2 litres car au-delà, les produits réalisés selon l'enseignement de ces brevets sont relativement lourds du fait que la quantité de matière est liée au volume. Dans le cas des petits volumes et quel que soit le procédé de réalisation des contenants à parois minces, la rigidité du contenant est insuffisante. Cette rigidité est insuffisante pour permettre une bonne préhension avant ouverture et surtout cette faible rigidité rend difficile voire impossible une superposition de ces contenants pleins, notamment lorsqu'ils sont palettisés et que les palettes sont gerbées les unes sur les autres.These containers are very attractive for small volumes of less than 2 liters because beyond, the products made according to the teaching of these patents are relatively heavy because the amount of material is related to the volume. In the case of small volumes and whatever the method of making thin-walled containers, the rigidity of the container is insufficient. This rigidity is insufficient to allow a good grip before opening and especially this low rigidity makes it difficult or impossible to superpose these full containers, especially when they are palletized and the pallets are stacked on top of each other.
De plus, la rigidité d'un tel contenant à paroi mince pose un autre problème car ces contenants sont conditionnés à température ambiante et lorsque ces contenants sont placés en ambiance froide, il se produit un phénomène de collapse qui engendre des déformations du contenant. De ce fait, lorsque les contenants à parois minces sont emplis à froid osec des liquides plats tels que l'eau minérale, l'huile, les jus de fruits, le lait, on a recours à une installation travaillant par voie aseptique, nécessairement. Ensuite, pour répondre à la nécessité de rigidité, il est prévu de mettre ces contenants à parois minces sous pression interne en recourant notamment au procédé dit de la goutte d'azote qui est couramment utilisé industriellement. Ce procédé consiste à introduire dans le contenant empli du liquide à conditionner, une goutte d'azote liquide, immédiatement avant bouchage, dans l'espace de tête du contenant.In addition, the rigidity of such a thin-walled container poses another problem because these containers are conditioned at room temperature and when these containers are placed in a cold environment, there is a phenomenon of collapse which causes deformation of the container. Therefore, when the thin-walled containers are filled cold with flat liquids such as mineral water, oil, fruit juice, milk, it is necessary to use an aseptic working system, necessarily. Then, to meet the need for rigidity, it is planned to put these thin-walled containers under internal pressure by including the so-called method of nitrogen drop which is commonly used industrially. This method consists in introducing into the filled container of the liquid to be conditioned, a drop of liquid nitrogen, immediately before capping, in the headspace of the container.
Immédiatement après bouchage, cette goutte d'azote liquide se transforme en gaz. L'augmentation de volume dans l'espace de tête conduit à une montée en pression de l'intérieur du contenant et donc à un rigidification dudit contenant. Cette amélioration de pression reste néanmoins relativement faible de l'ordre du dixième de bar.Immediately after capping, this drop of liquid nitrogen is converted into gas. The increase in volume in the head space leads to a rise in pressure of the inside of the container and therefore to a stiffening of said container. This pressure improvement remains relatively low of the order of one tenth of a bar.
Cependant, ce procédé de la goutte d'azote pose un certain nombre de problèmes. D'abord le dosage du volume introduit est difficile, or la pression finale dépend de la quantité introduite, des conditions de travail et du délai de bouchage.However, this method of nitrogen drop poses a number of problems. Firstly, the dosage of the introduced volume is difficult, but the final pressure depends on the quantity introduced, the working conditions and the capping time.
Ensuite, les moyens de distribution de cette goutte d'azote doivent être intégrés dans la chaîne et, de ce fait, ils doivent donc être adaptés pour fonctionner en milieu aseptique, ce qui est une contrainte forte : nécessités de nettoyage, de stérilisation, de maintenance. Un poste supplémentaire implique une source supplémentaire de panne awec arrêt d'une chaîne sur laquelle les interventions sont difficiles et longues car il faut remettre l'ensemble aux conditions de conditionnement aseptique.Then, the distribution means of this drop of nitrogen must be integrated in the chain and, therefore, they must be adapted to operate in an aseptic environment, which is a strong constraint: cleaning, sterilization, maintenance. An additional station involves an additional source of failure to stop a chain on which the interventions are difficult and long because it is necessary to put all the conditions of aseptic packaging.
De plus, on constate que l'azote liquide, à une température fortement négative, tombe dans le liquide à température ambiante si bien que la tombée de goutte provoque régulièrement des éclaboussures sur les bords du contenant.In addition, it is found that the liquid nitrogen, at a strongly negative temperature, falls into the liquid at room temperature so that the drop of drop regularly causes splashing on the edges of the container.
Ces éclaboussures du fluide contenu tel que eau minérale, jus de fruit, huile peuvent se dégrader après conditionnement, durant le stockage conduisant au développement de moisissures avant que le produit ne soit commercialisé et donc avant que le produit ne soit consommé, ce qui n'est pas satisfaisant.These splashes of the contained fluid such as mineral water, fruit juice, oil can degrade after conditioning, during storage leading to Mold development before the product is marketed and therefore before the product is consumed, which is not satisfactory.
Le matériau utilisé pour la fabrication des contenants à parois minces est souvent du PET, polyéthylène téréphtalate, connu pour sa transparence, son faible poids et ses grandes possibilités de conformation. Le PET autorise aussi une bonne conservation des liquides contenus.The material used for the manufacture of thin-walled containers is often PET, polyethylene terephthalate, known for its transparency, its low weight and its great possibilities of conformation. The PET also allows a good conservation of the contained liquids.
La présente invention propose un procédé de mise en pression de l'intérieur d'un contenant à paroi mince, empli à froid et contenant un liquide plat afin d'améliorer la rigidité dudit contenant avant ouverture, procédé qui pallie les problèmes évoqués ci-avant.The present invention provides a method of pressurizing the interior of a thin-walled container, filled cold and containing a flat liquid to improve the rigidity of said container before opening, a method that overcomes the problems mentioned above .
Selon l'invention, le contenant à paroi mince est du type fabriqué de façon connue par soufflage à partir d'une préforme.According to the invention, the thin-walled container is of the type manufactured in known manner by blowing from a preform.
Ce contenant présente le volume nécessaire et recherché.This container has the necessary volume and searched.
Par contre il subsiste des contraintes résiduelles de fabrication. En effet, dans le cas du PET, notamment, une fois que la préforme est soufflée, le contenant est refroidi très rapidement dans les moules. La forme obtenue et les contraintes liées à la déformation sont figées par cet abaissement de température.On the other hand, residual manufacturing constraints remain. Indeed, in the case of PET, in particular, once the preform is blown, the container is cooled very quickly in the molds. The shape obtained and the constraints related to the deformation are frozen by this lowering of temperature.
En effet, durant le soufflage les contraintes s'exercent dans deux sens, longitudinal et radial, d'où le nom de contenant en PET bi-orienté, donné aux contenants ainsi obtenus.Indeed, during the blowing the stresses are exerted in two directions, longitudinal and radial, hence the name of bi-oriented PET container given to the containers thus obtained.
C'est ce figeage à une température inférieure à la température de transition vitreuse qui assure au contenant la conservation de la forme.It is this freezing at a temperature below the glass transition temperature which ensures the container the preservation of the shape.
Dans le cas présent, selon un mode de réalisation non limitatif, le contenant à paroi mince obtenu présente un ratio poids de matière/surface de paroi de l'ordre de 150 g/m2 à 250 g/m2 et plus particulièrement de 150 g/m2 à 200 g/m2 . Le procédé de mise en pression, selon la présente invention, d'un contenant à paroi mince, destiné à contenir un liquide plat consiste en la succession des étapes suivantes :In the present case, according to a nonlimiting embodiment, the thin-walled container obtained has a weight ratio of material / wall surface of the order of 150 g / m 2 to 250 g / m 2 and more particularly 150 g / m 2 at 200 g / m 2 . The method of pressurizing, according to the present invention, a thin-walled container for containing a flat liquid consists of the succession of the following steps:
- réalisation d'un contenant à paroi mince, en générant des contraintes résiduelles,- production of a thin-walled container, generating residual stresses,
- emplissage à froid de ce contenant a^/ec ledit liquide plat,cold filling of this container with said flat liquid,
- bouchage du contenant après emplissage, et- capping the container after filling, and
- chauffage de la paroi du contenant, sans élévation de température du liquide, pour atteindre le point de température de relâchement desdites contraintes de façon à générer une mise en pression de l'intérieur dudit contenant.heating the wall of the container, without raising the temperature of the liquid, to reach the temperature point of relaxation of said stresses so as to generate a pressurization of the interior of said container.
Cette dernière étape dite de chauffage de la paroi vise à ne chauffer que la paroi prise dans son épaisseur. Cet apport de chaleur provoque le relâchement des contraintes qui avaient été figées par le refroidissement rapide après déformation en fabrication.This last so-called heating step of the wall is intended to heat only the wall taken in its thickness. This heat supply causes the relaxation of the stresses which had been frozen by the rapid cooling after deformation during manufacture.
Dans le cas d'un contenant en PET soufflé, les contraintes résiduelles sont bi- orientées. Le contenant a donc tendance à reprendre sa forme initiale, c'est-à- dire celle de la préforme. Du fait de cette tendance à une réduction volumique, l'intérieur du contenant est mis sous pression et comme le liquide est incompressible, l'espace de tête se comprime jusqu'à un équilibre entre la pression exercée par la paroi et la pression intérieure.In the case of a blown PET container, the residual stresses are bi-oriented. The container therefore tends to return to its original shape, that is to say that of the preform. Because of this tendency to a volume reduction, the interior of the container is pressurized and as the liquid is incompressible, the head space is compressed to a balance between the pressure exerted by the wall and the internal pressure.
La pression intérieure ainsi générée reste de l'ordre de dixièmes de bars mais cette pression se trouve être tout à fait suffisante pour améliorer considérablement la rigidité du contenant empli et bouché, avant son premier débouchage.The internal pressure thus generated remains of the order of tenths of a bar, but this pressure is found to be quite sufficient to considerably improve the rigidity of the container filled and clogged, before its first uncorking.
Un tel chauffage peut être réalisé au moyen d'une projection d'air chaud sur la périphérie du contenant pendant une courte durée. Il convient d'atteindre le point de température provoquant le relâchement des contraintes dans le matériau, point connu aussi sous le nom de point de transition vitreuse.Such heating can be achieved by means of a hot air projection on the periphery of the container for a short time. It is necessary to reach temperature point causing stress relaxation in the material, also known as the glass transition point.
L'apport d'énergie calorifique doit être important sur une durée très courte.The supply of heat energy must be important for a very short time.
Ainsi, le PET qui est mauvais conducteur de la chaleur, absorbe les calories apportées par l'air chaud, ce qui conduit à un relâchement rapide des contraintes et évite la transmission des calories au liquide ou du moins rend totalement négligeable la quantité de calories transmises.Thus, the PET which is bad conductor of the heat, absorbs the calories brought by the hot air, which leads to a fast release of the stresses and avoids the transmission of the calories to the liquid or at least renders totally negligible the quantity of calories transmitted .
En effet, en cas de chauffage et de montée en température de la masse liquide contenue, on sait que cela provoque, au refroidissement, une diminution du volume de l'espace de tête qui se traduit par un collapse de la bouteille. En effet, la pression intérieure diminue tandis que le contenant a vu son volume figé, puisque le relâchement des contraintes s'est également figé avec l'abaissement de la température sous le point de transition vitreuse.Indeed, in case of heating and temperature rise of the liquid mass contained, it is known that this causes, on cooling, a decrease in the volume of the head space which results in a collapse of the bottle. In fact, the internal pressure decreases while the container has seen its volume frozen, since the relaxation of the stresses has also frozen with the lowering of the temperature below the glass transition point.
La mise en pression intérieure selon le procédé de la présente invention permet aussi de compenser la diminution de pression, faible mais susceptible d'exister, liée à la perte d'une partie du liquide du fait de la perméabilité des parois, ces parois étant très minces.The internal pressurization according to the method of the present invention also makes it possible to compensate for the pressure decrease, which is small but may exist, related to the loss of a part of the liquid due to the permeability of the walls, these walls being very thin.
La mise en pression de l'intérieur du contenant permet aussi de compenser le collapse lié à une diminution de température entre la température de conditionnement et la température de stockage, avant ouverture.The pressurization of the inside of the container also makes it possible to compensate for the collapse due to a decrease in temperature between the conditioning temperature and the storage temperature, before opening.
Le procédé ainsi utilisé est extrêmement industrialisable avec des coûts très limités, des risques de panne très réduits, une reproductibilité tout à fait satisfaisante puisqu'elle est auto régulée.The process thus used is extremely industrializable with very limited costs, risks of failure very reduced, reproducibility quite satisfactory since it is self-regulating.
Surtout, le traitement de rigidification par la chaleur est conduit à l'extérieur de la chaîne à milieu aseptique, ce qui est un gain considérable.Above all, the heat-stiffening treatment is conducted outside the aseptic-medium chain, which is a considerable gain.
Les contenants à parois minces ainsi réalisés, ayant des épaisseurs de parois telles que le ratio poids de matière/surface est compris entre 150g/m2 et 250g/m2 , plus particulièrement compris entre 150 g/m2 et 200 g/m2 , peuvent résister à des charges importantes du fait de leur rigidité fortement améliorée, notamment de tels contenants peuvent être palettisés et les palettes peuvent être elles-mêmes gerbées.Thin-walled containers thus produced, having wall thicknesses such as the weight ratio of material / surface is between 150g / m 2 and 250g / m 2 , more particularly between 150 g / m 2 and 200 g / m 2 , can withstand significant loads because of their greatly improved rigidity, including such containers can be palletized and the pallets can themselves be stacked.
On note aussi que du point de vue sanitaire, la garantie de la conservation des qualités conférées au liquide durant l'embouteillage ne peut être contestée puisque l'opération de chauffage est extérieure à la chaîne d'embouteillage en milieu aseptique et s'effectue sur un contenant fermée.It is also noted that from a health point of view, the guarantee of the preservation of the qualities conferred on the liquid during bottling can not be disputed since the heating operation is external to the bottling line in an aseptic medium and is carried out on a closed container.
On supprime même une source éventuelle de contamination puisque le poste permettant la mise sous pression de l'intérieur du contenant est retirée de la zone travaillant en milieu aseptique.Even a possible source of contamination is eliminated since the station allowing the pressurization of the interior of the container is removed from the zone working in an aseptic medium.
Le chauffage dont il est indiqué qu'un mode de réalisation préférentiel est celui de l'air chaud peut aussi faire appel à des chauffages par infrarouges.Heating which is indicated that a preferred embodiment is that of hot air may also use infrared heaters.
De même le matériau concerné est le PET car il est actuellement le plus utilisé mais tout matériau adapté pour réaliser un contenant, susceptible de présenter des contraintes résiduelles, venues de déformation, est concerné par la présente invention. Similarly, the material concerned is PET because it is currently the most used but any suitable material for making a container, likely to have residual stresses, come from deformation, is concerned by the present invention.

Claims

REVENDICATIONS
1. Procédé de mise en pression d'un contenant à paroi mince, destiné à contenir un liquide plat, caractérisé en ce qu'il consiste en la succession des étapes suivantes :1. A method of pressurizing a thin-walled container for containing a flat liquid, characterized in that it consists of the succession of the following steps:
- réalisation d'un contenant à paroi mince, en générant des contraintes résiduelles,- production of a thin-walled container, generating residual stresses,
- emplissage à froid de ce contenant avec ledit liquide plat,cold filling of this container with said flat liquid,
- bouchage du contenant après emplissage, et- capping the container after filling, and
- chauffage de la paroi du contenant, sans élévation de température du liquide, pour atteindre le point de température de relâchement desdites contraintes de façon à générer une mise en pression de l'intérieur dudit contenant.heating the wall of the container, without raising the temperature of the liquid, to reach the temperature point of relaxation of said stresses so as to generate a pressurization of the interior of said container.
2. Procédé de mise en pression d'un contenant selon la revendication 1, caractérisé en ce que la réalisation d'un contenant à paroi mince consiste en un soufflage. 2. A method of pressurizing a container according to claim 1, characterized in that the embodiment of a thin-walled container consists of a blowing.
3. Procédé de mise en pression d'un contenant selon la revendication 1 ou 2, caractérisé en ce que le chauffage du contenant bouché est effectué par un soufflage d'air chaud.3. A method of pressurizing a container according to claim 1 or 2, characterized in that the heating of the clogged container is effected by blowing hot air.
4. Procédé de mise en pression d'un contenant selon l'une quelconque des revendications précédentes, caractérisé en ce que remplissage du contenant est effectué en milieu aseptique.4. A method of pressurizing a container according to any one of the preceding claims, characterized in that filling of the container is performed in an aseptic medium.
5. Procédé de mise en pression d'un contenant selon l'une quelconque des revendications précédentes, caractérisé en ce que le contenant à paroi mince comprend un ratio poids de matière/surface dudit contenant compris entre 150g/m2et 250 g/m2 , plus particulièrement entre 150 g/m2 et 200 g/m2. 5. A method of pressurizing a container according to any one of the preceding claims, characterized in that the thin-walled container comprises a weight ratio of material / surface of said container between 150g / m 2 and 250 g / m 2 , more particularly between 150 g / m 2 and 200 g / m 2 .
6. Procédé de mise en pression d'un contenant selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau est du polyéthylène téréphtalate ou PET.6. A method of pressurizing a container according to any one of the preceding claims, characterized in that the material is polyethylene terephthalate or PET.
7. Procédé de mise en pression d'un contenant selon l'une quelconque des revendications précédentes, caractérisé en ce que le liquide plat est de l'eau minérale, de l'huile, du jus de fruit, du lait.7. A method of pressurizing a container according to any one of the preceding claims, characterized in that the flat liquid is mineral water, oil, fruit juice, milk.
8. Contenant à paroi mince obtenu à partir du procédé selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une surpression intérieure de quelques dixièmes de bars. 8. Thin-walled container obtained from the process according to one of the preceding claims, characterized in that it comprises an internal pressure of a few tenths of bars.
9. Contenant selon la revendication 8, caractérisé en ce qu'il présente un ratio poids de matière/surface compris entre 150 g/m2 et 250 g/m2.9. Container according to claim 8, characterized in that it has a weight ratio of material / surface between 150 g / m 2 and 250 g / m 2 .
10. Contenant selon la revendication 9, caractérisé en ce qu'il présente un ratio poids de matière/surface compris entre 150 g/m2 et 200 g/m2. 10. Container according to claim 9, characterized in that it has a weight ratio of material / surface between 150 g / m 2 and 200 g / m 2 .
EP08842872A 2007-10-10 2008-10-09 Method for pressurizing the interior of a thin-walled container, and resulting pressurized container Withdrawn EP2200809A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0758188A FR2922151B1 (en) 2007-10-10 2007-10-10 METHOD FOR PRESSURIZING THE INTERIOR OF A THIN-FILM CONTAINER CONTAINING PRESSURIZED PRESSURE
PCT/FR2008/051825 WO2009053615A2 (en) 2007-10-10 2008-10-09 Method for pressurizing the interior of a thin-walled container, and resulting pressurized container

Publications (1)

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EP2200809A2 true EP2200809A2 (en) 2010-06-30

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EP08842872A Withdrawn EP2200809A2 (en) 2007-10-10 2008-10-09 Method for pressurizing the interior of a thin-walled container, and resulting pressurized container

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US (1) US20100209635A1 (en)
EP (1) EP2200809A2 (en)
JP (1) JP2011500457A (en)
CN (1) CN101842216A (en)
AU (1) AU2008315891A1 (en)
CA (1) CA2702282A1 (en)
FR (1) FR2922151B1 (en)
MX (1) MX2010003780A (en)
WO (1) WO2009053615A2 (en)
ZA (1) ZA201002461B (en)

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JP2011500457A (en) 2011-01-06
CN101842216A (en) 2010-09-22
MX2010003780A (en) 2010-09-24
FR2922151A1 (en) 2009-04-17
AU2008315891A1 (en) 2009-04-30
FR2922151B1 (en) 2010-01-01
WO2009053615A3 (en) 2009-06-18
CA2702282A1 (en) 2009-04-30
ZA201002461B (en) 2011-02-23
WO2009053615A2 (en) 2009-04-30
US20100209635A1 (en) 2010-08-19

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