Hot pin parison injection molding technique

Details Hot pin parison injection molding technique Hot pin parison injection molding technique

1976-01-22

1977-10-18

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264327, 425526, 425530, 425533, B29C 1707

Patent

active

040546306

ABSTRACT:
Parisons for use in making blow molded highly molecularly oriented plastic bottles are injection molded using a cooled cavity and a relatively hot core pin to prevent the formation of residual internal stress in or near the surface of the parison. The pin is maintained at a temperature above the glass transition temperature of the resin to reduce the formation of cracks when the parison is subsequently blow molded in the orientation temperature range.

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patent: 3792946 (1974-02-01), Zavasnik
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patent: 3934743 (1976-01-01), McChesney et al.
patent: 3963399 (1976-06-01), Zavasnik

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