METHOD OF THERMAL CRYSTALLIZATION TREATMENT FOR CYLINDRICAL MOUTHPART OF PREFORM

摘要

A method of thermal crystallization treatment by means of an inverted conveyance type jig, by which a cylindrical mouthpart of preform with high dimensional accuracy can be obtained; a process of thermal crystallization treatment for a cylindrical mouthpart, conducted in high productivity; and a process of biaxially stretching blow molding. There is provided a method of while mounting a preform of synthetic resin for biaxially stretching blow molding on an inverted conveyance type jig, conducting thermal crystallization treatment of a cylindrical mouthpart thereof, wherein the thermal crystallization treatment is carried out while having, fitted on the jig, a preform with a gap provided under the top plane of the cylindrical mouthpart of the preform.