Method and apparatus for producing molded plastic articles such

Details Method and apparatus for producing molded plastic articles such Method and apparatus for producing molded plastic articles such

1980-07-02

1982-10-05

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

264259, 264294, 264323, 264325, 264DIG41, B29D 2304

Patent

active

043527752

ABSTRACT:
A blank is formed out of plasticizable, heated plastic by means of an extruding-type material supply head. A somewhat lenticular profiling of the blank is obtained by appropriately controlling a closing member of the material supply head, which is built as a valve cone. When the closing member is closed off against the lower edge of a tube part of the material supply head, the blank is pinched off from the material supply. A flow of air emerging from a ring nozzle serves to ensure complete severance of the blank from the material supply head. After that has been accomplished, the blank enters an open shaping cavity of a die by free fall. By further movement of the die, which is located on a rotary table, the die removes itself from the permanently located material supply head, so that the blank lying in the cavity can be pressed into a molded article by a stamp. Cooling off too much in certain locations on the blank is prevented by the free fall of the blank into the shaping cavity.

REFERENCES:
patent: 1751624 (1930-03-01), Du Brul
patent: 3172933 (1965-03-01), Flax
patent: 3280423 (1966-10-01), Voumard
patent: 3330006 (1967-07-01), Jenkins
patent: 3375553 (1968-04-01), Criss
patent: 3511845 (1970-05-01), Scalora
patent: 3670066 (1972-06-01), Valyi

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