Parison control in longitudinal stretch

Details Parison control in longitudinal stretch Parison control in longitudinal stretch

1975-10-31

1977-07-05

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 403, 264 92, 264 97, 425522, B29C 1707

Patent

active

040340368

ABSTRACT:
An injection molded parison is positioned in a mold cavity having a high length to diameter ratio and being provided with means along the length of the cavity to selectively and alternatively exert positive pressure as an air cushion, or negative pressure as a vacuum, on portions of the parison as the parison is expanded through the length of the cavity. The thickness of the expanding parison is thus controlled so that in subsequent expansion in the blow mold, the finished hollow article will have the desired wall thickness.

REFERENCES:
patent: 2326041 (1943-08-01), Lavallee
patent: 3347966 (1967-10-01), Seefluth
patent: 3412188 (1968-11-01), Seefluth
patent: 3662048 (1972-05-01), Turner

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