Blow molding apparatus

Details Blow molding apparatus Blow molding apparatus

1986-10-10

1987-10-13

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

425535, B29C 4946

Patent

active

046995854

ABSTRACT:
In producing hollow bodies by blow molding from thermoplastic material, a preferably tubular preform is firstly formed, and is then expanded within the blowing mold under the effect of an inert gas under high pressure, until it bears entirely against the inside surface of the blowing mold. Thereafter, a reaction gas such as fluorine is introduced into the hollow body under a considerably lower pressure, while the hollow body is still in the mold, to treat the internal surface of the hollow body to render it impervious to gas and/or liquid. After the reaction has elapsed, a flushing and cooling gas is introduced into the hollow body and is then removed from the blowing mold after the hollow body has sufficiently set.

REFERENCES:
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patent: 3862284 (1975-01-01), Dixon et al.
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patent: 4081574 (1978-03-01), Hawkins et al.
patent: 4336015 (1982-06-01), Rainville
patent: 4394333 (1983-07-01), Fukushima et al.
patent: 4439126 (1984-03-01), Fukushima et al.

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