METHOD OF THERMAL CRYSTALLIZATION TREATMENT FOR CYLINDRICAL MOUTHPART OF A PREFORM

摘要

A technical problem of this invention is to create a method for thermal crystallization by means of a jig of the inverted support type that enables a preform neck to be obtained with high dimensional accuracy. The object of this invention is to provide a highly productive thermal crystallization method for the bottle neck and an efficient biaxial drawing and blow molding process for the bottle. The means of carrying out this object comprises that the thermal crystallization of the neck is carried out by installing an inverted preform on the jig while the top neck surface is spaced from the top jig surface and utilizing the method for thermal crystallization under the conditions that the jig of the inverted support type is loaded with a synthetic resin preform for use in the biaxial drawing and blow molding process.