Method for stretch blow molding and uniformly cooling a hollow h

Details Method for stretch blow molding and uniformly cooling a hollow h Method for stretch blow molding and uniformly cooling a hollow h

1990-08-27

1992-02-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264530, 264531, 264532, 425526, 425529, 425535, B29C 4912, B29C 4958, B29C 4966

Patent

active

050858220

ABSTRACT:
A method for stretch blow molding a preform into a hollow container having a heat-resistant property, including the steps of heat setting the hollow container by maintaining the hollow container heated for a predetermined period of time within a blow mold and cooling the hollow container by the use of a cooling medium blown out from the forward end of a stretching rod at least during backward movement of the stretching rod. If the heat setting operation is to be performed in a heat setting mold separately of the blow mold, the hollow container is cooled by the cooling medium blown out from the forward end of a cooling medium introducing rod while being moved. Since the cooling medium outlet is axially moved, the hollow container can be cooled uniformly, even if the hollow container has a particularly increased rate of longitudinal stretch. If a cooling medium introducing tube for introducing the cooling medium along the central axis of the rod is thermally insulated, any sweating and/or freezing on the rod can be prevented.

REFERENCES:
patent: 3233416 (1966-02-01), Rainwater et al.
patent: 3488801 (1970-01-01), Havely
patent: 4039641 (1977-08-01), Collins
patent: 4152383 (1979-05-01), Ryder
patent: 4385089 (1983-05-01), Bonnebat et al.
patent: 4871507 (1989-10-01), Ajmera
patent: 4883631 (1989-11-01), Aimera

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