Method for the manufacture of tubular preforms of plastics

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

1983-07-06

1986-06-10

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Simultaneous severing and shaping, or severing while work...

264539, 264541, 2643287, 26432811, 26432819, 264319, 425532, 425533, 425577, B29C 4500, B29C 4700, B29C 4102

Patent

active

045942129

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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