B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 61/00 (2006.01) B65B 61/24 (2006.01) B67C 3/04 (2006.01)
Patent
CA 2740306
The subject of the invention is a method of treating a thin-walled plastic container, the said container having residual stresses resulting from its manufacture from a preform, having been hot-filled with a liquid content and stoppered then cooled once filled and stoppered, and being intended to undergo stress relief by a heat treatment, characterized in that it comprises a step prior to the heat treatment step and which consists in applying a mechanical force to the external surface of the thin wall of the container deformed by the hot-filling in order to generate an internal pressure to compensate at least for the vacuum to which it is subjected and return it to its initial shape. The invention also covers an associated device for implementing the said method.
L'objet de l'invention est un procédé de traitement d'un contenant à paroi mince en matière plastique, ledit contenant présentant des contraintes résiduelles issues de sa fabrication à partir d'une préforme, ayant été rempli et bouché à chaud d'un contenu liquide puis refroidi une fois rempli et bouché, et étant destiné à subir un relâchement des contraintes par un traitement thermique, caractérisé en ce qu' il comprend une étape préalable à celle du traitement thermique qui consiste à exercer un effort mécanique sur la surface externe de la paroi mince du contenant déformé par le remplissage à chaud pour générer une pression intérieure afin de compenser au moins la dépression à laquelle il est soumis et lui redonner sa forme initiale L'invention couvre aussi un dispositif associé pour la mise en oeuvre dudit procédé.
Robic
Tecsor Hr
LandOfFree
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