STRETCH BLOW MOLDING OF PET BOTTLE: SIMULATION OF BLOWING PROCESS AND PREDICTION OF BOTTLE PROPERTIES

摘要

This paper presents a technique for describing more accurately mechanical behaviors of a PET stretch blow molded bottle by using distributions of modulus and thickness over the bottle surface. The values of modulus and thickness at each point of surface of the bottle were predicted from deformation histories of the material during the blowing process, which were obtained in numerical simulation of the blowing process. It also needed experimental measurements and estimation of mechanical properties of a stretched material up to stretch conditions in the blowing process in order to find out dependency of the properties on stretch conditions.