PARTIAL CRYSTALLIZATION METHOD AND APPARATUS OF AMORPHOUS PLASTIC ARTICLES

摘要

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 mol d 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.