Method of making blown plastic articles

Details Method of making blown plastic articles Method of making blown plastic articles

1976-01-23

1977-11-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 97, 264328, 425533, B29C 1707

Patent

active

040576094

ABSTRACT:
The present invention proposes a novel method of making a blown plastic article. A cantilevered blow pin is axially insertable into and removable from a parison mold cavity. When inserted into the cavity, the blow pin abuts a support which is coaxial with the blow pin and which supports the blow pin against deflection in the cavity. Upon filling of the parison mold cavity with plasticized plastic material under pressure, a parison is formed about the blow pin and the support. Upon removal of the blow pin from the cavity, the parison thereon is stripped from the cavity and from the support. That portion of the parison projecting beyond the blow pin and formerly enclosing the support forms a tubular extension projecting beyond the blow pin. Upon transfer to a blow mold, the projecting portion of the parison is pinched shut to form a blowable shape, which is then blown interiorily of a blow mold into either a blown pre-form or the final article.

REFERENCES:
patent: 2262612 (1941-11-01), Kopitke
patent: 3590114 (1971-06-01), Uhlig

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