Injection blow molding process

Details Injection blow molding process Injection blow molding process

1981-01-26

1982-11-02

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...

264537, B29C 1707

Patent

active

043572960

ABSTRACT:
A process and multistation apparatus for injection blow molding a thermoplastic material to form a blow molded container having an integral injection molded handle is disclosed. The process and apparatus feature an injection mold which is closed to form an injection mold cavity with a contiguous injection mold handle cavity. A preform pin is inserted into the injection mold cavity through a preform carrier to form a preform recess into which hot thermoplastic is injected to form a hollow preform having a solid injection molded handle. After cooling the thermoplastic preform the preform pin is withdrawn and the molds are opened. The injection formed preform may be optionally heat treated prior to the preform being enclosed within a blow mold. The blow mold forms a cavity having the final desired container shape and a cavity into which the handle is enclosed. Blow air is introduced into the preform to inflate it to the shape of the blow mold cavity thereby forming a blow molded container having an injection molded handle attached thereto. A preform carrier may be used to carry the injection molded preform from the injection mold station to the blow mold station. The carrier attains attachment to the preform as the preform is formed in the injection mold.

REFERENCES:
patent: 3172929 (1965-03-01), Santelli
patent: 3850562 (1974-11-01), Takeuchi et al.
patent: 4280859 (1981-07-01), Thompson

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