Method for hot-filling a thin-walled container

B - Operations – Transporting – 67 – C

Patent

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Details

B67C 7/00 (2006.01) B65B 3/02 (2006.01) B67C 3/14 (2006.01)

Patent

CA 2612365

The invention concerns a method for hot-filling a container with a sterilized liquid, generally at a temperature ranging between 60 and 95 °C, characterized in that it includes the following steps: a) providing a container made of a material and in accordance with a process adapted to make it resistant to hot-filling with said liquid, said container having residual stresses resulting from its manufacture; b) filling said container with said hot liquid; c) closing said filled container immediately after it has been filled; d) allowing it to cool at least below a congealing temperature of the container, causing the container to be deformed by formation of a depression therein; and e) heating the container to bring about relaxation of the residual stresses, said relaxation leading to a reduction and subsequently generating an internal pressurization of the container which compensates at least the deformations caused by the effects of the depression of step d).

L'objet de l' invention est un procédé de remplissage à chaud d'un contenant avec un liquide stérilisé, généralement à une température située entre 60 à 95~C, caractérisé en ce qu'il consiste à réaliser les étapes suivantes : a. disposer d'un contenant réalisé en un matériau et suivant un procédé apte à le rendre résistant au remplissage à chaud dudit liquide, ledit contenant ayant des contraintes résiduelles issues de sa fabrication, b. remplir ledit contenant avec ledit liquide chaud, c. obturer aussitôt après remplissage ce contenant rempli, d. laisser refroidir au moins au-dessous d'une température de figeage du contenant, provoquant une déformation par formation d'une dépression à l' intérieur du contenant, et e. chauffer le contenant pour provoquer un relâchement des contraintes résiduelles, ce relâchement conduisant à un rétreint et consécutivement générant une mise en pression interne du contenant ce qui compense au moins les déformations subies par les effets de la dépression de l'étape d/.

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