Patent ID: 7981351
Filing Date: 2011-07-19
Classification: B29B,B29C,B29K

Abstract:
1. A method for thermally crystallizing a neck of a primary molded product for forming a bottle-shaped container made of polyethylene terephthalate as a principal ingredient, said neck having a functional part and a neck ring at a lower end thereof, said functional part being formed with screw threads at an upper portion thereof and a bead ring below the screw threads, said method comprising: heating the neck, then cooling the neck gradually, contacting the bead ring of the neck with a jig configured to squeeze the bead ring in the cooling step, the neck being at a thermally deformable temperature, and squeezing the bead ring inwardly with the jig in the cooling step, wherein the method results in the bead ring having an outer diameter within a dimensional tolerance for deformation with regard to sealing effect, wherein the jig has a piston rod; and wherein the piston rod abuts an upper end of the neck and prevents the neck from being pulled up.