A process for forming a container by stretch blow molding and container formed thereby

摘要

The present invention relates to process for forming a container by stretching and blow-molding a preform within a mold cavity comprising the steps of:
(i) introducing a preform into the mold cavity and stretching the preform with a stretch rod;
(ii) increasing the pressure within the preform so that the preform expands within the mold cavity in a blowing step;
(iii) at least one inwardly moving mold section within the mold cavity so that the expanding preform is deformed by the inwardly moving mold section;
wherein the glass transition temperature (Tg) of the preform material is at least 10°C below the temperature of the walls of the mold cavity. The present invention further relates to a stretch blow molded container comprising walls of a thermoplastic polyolefin, the thermoplastic polyolefin having a glass transition temperature of less than 30°C and wherein the container has a degree of asymmetry of at least 1.5.