Partial crystallization method and apparatus of amorphous...

B - Operations – Transporting – 29 – C

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B29C 45/16 (2006.01) B29C 45/73 (2006.01) B29C 49/22 (2006.01) B29C 49/64 (2006.01) B29D 1/00 (2006.01) B29D 23/00 (2006.01) B29C 35/08 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2286746

A plastic article having a crystallized portion and an amorphous portion is formed. The article is produced by injecting molten plastic into a mold cavity (22) of preform mold (10). The hot plastic within the mold cavity is quickly cooled in regions which are to be amorphous and more slowly cooled or heated in regions to be crystalline. The injection mold and include cooling channels (12, 16, 24) for cooling the molten plastic and thermal insulating sleeve (46, 48) to insulate the region to be crystallized from the coolant. In another embodiment, heating elements can be located on the preform mold (10) adjacent regions of the article to be crystallized.

On décrit la formation d'un article plastique présentant une partie cristallisée et une partie amorphe. L'article est produit par injection de plastique en fusion dans une cavité (22) d'un moule de préforme (10). Le plastique chaud à l'intérieur de la cavité du moule est refroidi rapidement pour les parties devant être amorphes, et refroidi ou chauffé plus lentement pour les parties devant être cristallisées. Le moule à injection peut inclure des canaux de refroidissement (12, 16, 24) pour refroidir le plastique fondu, et une gaine thermo-isolante (46, 48) pour isoler du caloporteur la partie à cristalliser. Dans une forme de réalisation, des éléments de chauffage peuvent être placés sur le moule de préforme (10), attenants à des parties de l'article devant être cristallisées.

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