Parison mold-core apparatus

Details Parison mold-core apparatus Parison mold-core apparatus

B - Operations, Transporting

29

F

18/708

B29F 1/022 (1980.01)

Patent

CA 1153522

PARISON MOLD-CORE APPARATUS ABSTRACT OF THE DISCLOSURE Mold and core rod combination for forming a plastic parison for stretch/blowing into a plastic bottle com- prising a core rod with an end mated to the mold so as to permit formation of a parison with a flat bottom wherein the bottom corners of the parison have a sharp taper. The core rod is preferably shaped to include a shoulder having a substantially straight outer wall at the mouth end of the parison mold, and constructed and arranged with the mold to permit deposit of additional plastic at the inner wall of the shoulder of the parison. The design of the mated mold and core rod combination is based on the recognition that in a continuous bottle forming process a particular area of the parison can be made hotter or cooler by increasing or decreasing the thickness of that area of the parison. Parisons formed with the disclosed mold-core rod combination permit a deeper and longer stretch of the parison without tearing or deformation of the parison bottom or deformation or wrinkling at the shoulder of the finished bottle while providing essential wall strength.

409358

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