Non-scuffing, non-sticking blow core for stretch blow molding ma

Details Non-scuffing, non-sticking blow core for stretch blow molding ma Non-scuffing, non-sticking blow core for stretch blow molding ma

1993-12-01

1995-10-03

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

With filling means

264549, 264550, 425529, 425536, B29C 4912

Patent

active

054547075

ABSTRACT:
The tip of the blow core on a stretch blow molding machine is slightly smaller in diameter than the neck of the preform into which it is inserted such that during both insertion and withdrawal there is no physical contact between the core and the preform. However, when the core tip is in place within the preform and the blow surge commences, a resilient sealing ring around the core tip expands into radial contacting engagement with the preform to seal off what would otherwise be an air escape route. When the air surge terminates, the ring contracts into a dove tail gland around the core tip so as to be substantially flush with the surface of the tip, permitting the core to be withdrawn without contacting the preform.

REFERENCES:
patent: 2157983 (1939-05-01), Glougie
patent: 3331610 (1967-07-01), Olson
patent: 3342914 (1967-09-01), Edwards
patent: 3947205 (1976-03-01), Edwards
patent: 3993427 (1976-11-01), Kauffman et al.
patent: 4244913 (1981-01-01), Ryder
patent: 4362304 (1982-12-01), Hunger
patent: 4790741 (1988-12-01), Takakusaki et al.

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