Method for injection molding polyethylene terephthalate

B - Operations – Transporting – 29 – C

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B29C 45/00 (2006.01) B29B 11/08 (2006.01) B29B 13/02 (2006.01) B29C 31/04 (2006.01) B29C 45/47 (2006.01) B29C 45/50 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2122282

A method for injection molding polyethylene terephthalate by employing a vent type injection unit as means for omitting preliminary drying the resin, wherein the unit does not develop a poor screw biting, and even when a molding material is an undried uncrystallized or crystallized PET, can feed a certain amount of the material at all times to injection mold a desired transparent molded form such as a preform, and use the preform to produce a thin-wall container with a low cost.

Méthode pour mouler par injection du terephthalate de polyéthylène en employant un injecteur du type à ventilation comme moyen d'ometttre le séchage préliminaire de la résine, dans laquelle l'injecteur n'est pas sujet à un mordant de vis inadéquat et, même quand le matériau de moulage est du PET non sec et non cristallisé ou cristallisé, peut toujours fournir une certaine quantité du matériau pour mouler par injection la forme moulée transparente qu'on souhaite, telle une préforme, et utiliser la préforme pour produire à faible coût un récipient à paroi mince.

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