Method of injection-blow molding biaxially-oriented hollow plastic containers

Abstract From the Canadian patent

A biaxially-oriented hollow plastic container is molded by injecting plastic around a core pin in an injection mold and forming the finish of the bottle in a neck ring mold which forms part of the parison mold. After the parison has been temperature conditioned, the core pin neck ring mold, assembly and parison are removed from the injection (parison) mold as a unit. The core pin is then removed from the unit further temperature conditioning takes place and the neck ring, mold transfers the parison into a split blow mold. The blow mold closes around the parison and a stretch rod enters the parison. As the stretch rod stretches the parison a blow, medium is injected into the parison which is …