Method for making blow molded containers with high length to dia

Details Method for making blow molded containers with high length to dia Method for making blow molded containers with high length to dia

1976-01-28

1978-07-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 97, B29C 1707

Patent

active

040988570

ABSTRACT:
This invention increases the length-to-diameter ratio of plastic articles made on injection molding machines without using long and relatively thin core rods. This added length is obtained by having the first part of the blowing operation stretch the parison lengthwise before there is any substantial displacement of the parison in a radial direction. At the start of the blowing operation, a tube surrounds and confines radial expansion of the parison, but this tube is withdrawn progressively as the blowing operation continues.

REFERENCES:
patent: 3470282 (1969-09-01), Scalora
patent: 3761550 (1973-09-01), Seefluth
patent: 3849530 (1974-11-01), Wyeth et al.
patent: 3972976 (1976-08-01), Farrell

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