PROCESS AND APPARATUS FOR PRODUCING BOTTLE−SHAPED CONTAINER MADE OF SYNTHETIC RESIN

摘要

A process for producing a bottle−shaped container made of a synthetic resin such as polyethylene terephthalate, which includes a heat treatment step in which that neck part of a preform which corresponds to the neck part of the container to be produced is heated and the resin in this part is crystallized. In the first stage of this heat treatment step, the neck part of the preform is temporarily heated to a temperature near the melting point of the synthetic resin, e.g., about 200 to 230°C in the case of a polyethylene terephthalate resin. In the subsequent second stage, the neck part of the preform is kept at a temperature within the range where crystallization of the synthetic resin is accelerated, e.g., about from 170 to 195°C in the case of a polyethylene terephthalate resin.