Injection stretch blow molding apparatus

Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means

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425529, 425533, 425534, 425538, 425556, B29C 4906, B29C 4912, B29C 4961, B29C 4970

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active

057441766

ABSTRACT:
An injection stretch blow molding apparatus and method wherein while the preforms are amply cooled the injection molding cycle time is shortened and furthermore a small number of blow cavities are used and the operation rate of these blow cavities is increased. In an injection molding section, N (N.gtoreq.2) preforms are injection molded and then released from the injection cavity mold at a relatively high mold-release temperature. While the preforms are cooled by the injection core mold, they are carried to a preform ejecting section. After the preforms cool to a temperature at which they can be ejected, the preforms are ejected from the injection core mold. In a transfer station, n (1.ltoreq.n<N) of the simultaneously molded N preforms at a time are transferred to a blow molding station in (N
) transfer operations. In the blow molding station, each preform is carried by a carrier member through a heating section and a standby section into a blow molding section. In the blow molding section, n bottles are simultaneously blow molded from n preforms.

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