Method and device for manufacturing container by compression...

B - Operations – Transporting – 29 – C

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B29C 49/64 (2006.01) B29B 11/12 (2006.01) B29C 49/02 (2006.01) B29C 71/02 (2006.01)

Patent

CA 2542485

A method and a device for continuously manufacturing a synthetic resin container by compression-molding a preform by a compression-molding machine and continuously stretch blow-molding by a stretch blow-molding machine. In the continuous molding method, to industrialize the molding method for continuously performing compression molding and stretch blow molding which is recognized as an excellent molding method from the view points of economic efficiency and production efficiency, problems such as the deterioration of preform performance due to a change in temperature of the preform or a variation in stretch blow molding properties due to a difference in temperature between the surface and inner part of the preform resulting from the thickness of the preform are solved to manufacture product containers with constant performance and excellent quality. After the molded preform is taken out from the compression molding machine, soaking treatment is applied to the preform and, as necessary, partial heating or partial cooling treatment is applied thereto, and then the stretch blow molding is performed for the preform.

La présente invention concerne un procédé et un dispositif de fabrication en continu d'un récipient en résine synthétique. Ce procédé consiste à mouler par compression une préforme dans une presse à compression, puis à l'étirer en continu dans une presse à soufflage bi-orienté. Toutefois, ce procédé du moulage en continu suivi d'un soufflage bi-orienté, s'il présente des avantages du point de vue du rendement économique et de la puissance de production, présente des inconvénients. Pour industrialiser le procédé, il a donc fallu résoudre le problème de la détérioration du rendement de la préforme imputable à ses écarts de températures, ou le problème de la détérioration des propriétés du soufflage bi-orienté imputable au pont thermique entre la surface et l'intérieur de la préforme en raison de son épaisseur. L'invention a permis une production industrielle stabilisée de récipients d'excellente qualité. La solution a consisté à soumettre à un trempage la préforme après sa sortie de la pression à compression, puis, en cas de besoin, à un chauffage partiel ou un refroidissement partiel, à la suite de quoi, on peut passer au soufflage bi-orienté de la préforme.

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