Apparatus for the manufacture of tubular preforms of plastics

Details Apparatus for the manufacture of tubular preforms of plastics Apparatus for the manufacture of tubular preforms of plastics

1985-11-27

1987-03-24

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Including means to prepare parison

264163, 425532, 425577, 425588, B29C 4502

Patent

active

046522298

ABSTRACT:
The invention relates to a method for the manufacture of tubular preforms. Its purpose is to improve the flow pattern in the plastics chamber and simultaneously to shorten the dwell time of the plastics. This is achieved, in the course of the dip blow method, by the fact that the geometric form of a plastics chamber (that is distinct from a separate screw chamber) is changed and the volume is decreased so that the tubular preform acquires a certain thickness or thickness distribution.

REFERENCES:
patent: 3751207 (1973-08-01), Mehnert
patent: 3825389 (1974-07-01), Pott

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