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

1993-04-12

1995-11-21

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...

425526, 425533, 425534, 264532, B29C 4906, B29C 4928

Patent

active

054684439

ABSTRACT:
An injection stretch blow molding method sequentially circulates a plurality of neck mold moving units for supporting and conveying neck molds adapted to hold the neck portions of hollow containers and preforms used to mold the hollow containers at least through preform injection molding, blow molding and ejecting stations, the preform injection molding step, the blow molding step for blow molding the hollow containers from the preforms having their potential heat provided by the injection molding step and the product ejecting step being repeatedly carried out. The injection molding stations of M in number are provided for blow molding stations of N in number (M>N.gtoreq.1). Preforms are injection molded in each of the injection molding stations at an injection molding start time staggered from those of the other injection molding stations by time equal to N.times.T/M where T is an injection molding cycle time in each of the injection molding stations. The neck mold moving units are sequentially moved from the injection molding stations to the empty blow molding station after the respective one of the injection molding stations has molded the preforms. The preforms are blow molded into the hollow containers in the blow molding stations through their blow molding cycle time which is set within N.times.T/M.

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Patent Abstracts of Japan, vol. 015, No. 389 (M1164) 2 Oct. 1991 & JP-A-03 159 726 (Nissei) 9 Jul. 1991.

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