Importance

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Abstract

A single injection blow molding apparatus for making a selected oriented finished product. The apparatus includes the support structure and an injection molding station where a parison is injection molded into a selected configuration. A core rod assembly cooperates in forming the parison which is formed about a first core rod. The parison is conditioned to an orientation temperature. A transfer system is on the support structure for removing the first core rod from the parison and transferring the parison to a blow molding station. The blow molding station is on the support structure and is provided for blow molding the parison while at orientation temperature into the configuration of the finished product. A second core rod assembly with a second core rod cooperates in blowing the parison into the configuration of the finished product. The transfer structure on the support structure assembles the second core rod with the parison at the blow molding station and disassembles it from the oriented finished product. The transfer structure includes parison support to hold the parison when coupled with the core rod and the injection molding and blow molding stations and when removed therefrom to facilitate formation of a finished product and removal of the finished product from the apparatus. A number of different cooling stages are employed in the system. At one point a poppet valve is used to permit air to escape from the blow mold and hasten cooling. In an alternative form, a pre-cure station is provided between the injection molding station and each blow molding station to facilitate conditioning of the parison.

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First Claim