Process for injection stretch blow molding

Details Process for injection stretch blow molding Process for injection stretch blow molding

1996-09-26

1999-09-14

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264532, B29C 4908

Patent

active

059519380

ABSTRACT:
An improved method for injection stretch blowing is provided. In the process, a molten resin is injected into an injection cavity defined by an injection mold, a lip mold and an injection core to form a desired preform, the cooling time for this preform being positively reduced to form a rigid skin layer on the outer surface of the preform without increasing the thickness. It is then released from the injection mold and transferred into the blow mold with a mouth portion being held with the lip mold while the skin layer keeps the configuration of the preform and the interior is in a high temperature state, and is stretch blow molded into a hollow molded article, e.g. a bottle whose major portion is ultra-thin, at the moment when the surface temperature of the preform that rises due to its own interior temperature is significantly higher than a glass transition temperature (Tg) and is expected to reach to a peak temperature. Thereby, it is possible to allow molding of a hollow molded article having a thickness of 0.17 mm or smaller without being affected by limitations of thickness of the preform and molding temperature even in a molding process where the preform is released from the mold at a high temperature and is then immediately subjected to stretch blow molding.

REFERENCES:
patent: 4235837 (1980-11-01), Noonan
patent: 5364585 (1994-11-01), Takeuchi
patent: 5620650 (1997-04-01), Nakajima et al.
patent: 5679306 (1997-10-01), Nakajima et al.

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