초록 ▼

A method for stretch blow molding a preform into a hollow container having a heat-resistant property, including the steps of heat setting the hollow container by maintaining the hollow container heated for a predetermined period of time within a blow mold and cooling the hollow container by the use

A method for stretch blow molding a preform into a hollow container having a heat-resistant property, including the steps of heat setting the hollow container by maintaining the hollow container heated for a predetermined period of time within a blow mold and cooling the hollow container by the use of a cooling medium blown out from the forward end of a stretching rod at least during backward movement of the stretching rod. If the heat setting operation is to be performed in a heat setting mold separately of the blow mold, the hollow container is cooled by the cooling medium blown out from the forward end of a cooling medium introducing rod while being moved. Since the cooling medium outlet is axially moved, the hollow container can be cooled uniformly, even if the hollow container has a particularly increased rate of longitudinal stretch. If a cooling medium introducing tube for introducing the cooling medium along the central axis of the rod is thermally insulated, any sweating and/or freezing on the rod can be prevented.

대표청구항 ▼

A method for stretch blow molding a preform into a hollow container having a heat-resistant property, comprising the steps of: positioning the preform in place within a heated blow mold; biaxially stretching and blow molding said preform into said hollow container by longitudinally stretching said p

A method for stretch blow molding a preform into a hollow container having a heat-resistant property, comprising the steps of: positioning the preform in place within a heated blow mold; biaxially stretching and blow molding said preform into said hollow container by longitudinally stretching said preform under the action of a stretching rod moved forwardly while causing a forward end of said stretching rod to engage the internal bottom of said preform and by transversely stretching said preform under the action of blowing fluid blown out from a blow core located within the neck portion of said preform; holding said hollow container within said blow mold under a blowing pressure and heat setting said hollow container by maintaining said hollow container heated for a predetermined period of time; cooling said hollow container, which has been heat set, by a cooling medium blown out from the forward end of said stretching rod at least during backward movement of said stretching rod away from the internal bottom of said reform;, and thereafter removing said hollow container from said blow mold.