Method and apparatus of injection stretch blow molding

Details Method and apparatus of injection stretch blow molding Method and apparatus of injection stretch blow molding

1993-08-26

1995-06-13

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264538, 425533, 425534, 425540, B29C 4906, B29C 4936

Patent

active

054240220

ABSTRACT:
An injection stretch blow molding method blow molds a preform into a hollow member while maintaining the preform at a temperature provided by an injection molding step. The method circulatively conveys neck mold support plates each for supporting and conveying a neck mold holding the neck portion of the hollow member or preform through working stations of M in number (M.gtoreq.3) including at least injection molding and blow molding stations. The total number N of neck mold support plates is set to be 2.ltoreq.N<M. The neck mold support plates are conveyed among the working stations other than the injection molding station within an injection molding time T for which an injection molding step is carried out using a neck mold support plate placed in the injection molding station. Before elapse of the injection molding time T, a neck mold support plate, which has ejected the molded hollow member, is caused to wait at a station before the injection molding step. After passage of the injection molding time T, two neck mold support plates resident in the injection molding station and another working station before the injection molding station are simultaneously conveyed to subsequent stations.

REFERENCES:
patent: 3453353 (1969-07-01), Ninneman
patent: 4061705 (1977-12-01), Marcus
patent: 4895509 (1990-01-01), Giacobbe
Patent Abstracts of Japan, vol. 6, No. 267 (M-182)(1145) Dec. 25, 1982 & JP-A-57 159 624 (TOSHIBA) Oct. 1, 1982.

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