Method of molding large containers by the process of stretch blo

Details Method of molding large containers by the process of stretch blo Method of molding large containers by the process of stretch blo

1995-09-21

1997-10-28

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264526, 264530, 425530, 425538, 425529, B29C 4918

Patent

active

056815204

ABSTRACT:
There is provided a method of molding a large container including the steps of preparing a preform from an injection-molded, thick-wall, closed-end parison by repeatedly and intermittently applying an air blow pressure to the parison and releasing the air blow pressure therefrom, and stretch blow molding the preform to a thin-wall large container. The closed-end parison is released from a mold immediately after a skin layer, keeping a parison shape, is formed on the surface of the closed-end parison having a high inner temperature, and is then molded to a preform with a preform mold heated to a predetermined temperature, while the surface temperature of the parison is increased by the inner temperature. The preform is kept at a stretch blow molding temperature and is stretch blow molded into a blow mold to produce a large container.

REFERENCES:
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patent: 4364721 (1982-12-01), Rainville
patent: 4547333 (1985-10-01), Takada
patent: 4615667 (1986-10-01), Roy
patent: 5474735 (1995-12-01), Krishnakumar et al.

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