Time saver plastic draw-back valve assembly

Details Time saver plastic draw-back valve assembly Time saver plastic draw-back valve assembly

1973-11-14

1976-02-24

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

With control means responsive to independently operated timer

For timing mold filling means

425167, 425244, 425245R, B29F 104

Patent

active

RE0287210

ABSTRACT:
This invention decreases the time of an injection molding machine cycle by cutting off communication between the mold and the source of material as soon as injection is complete, and accumulating material for the next charge during the cooling part of the cycle. Pressure is maintained on the material in the mold, and material is supplied to compensate cooling shrinkage, from an auxiliary cylinder in which a minor amount of hot material is accumulated. After sufficient cooling, runner material is drawn back by suction of the auxiliary cylinder. A three-way valve cuts off the main material supply and puts the auxiliary cylinder in communication with the mold.

REFERENCES:
patent: 2202140 (1940-05-01), Burroughs
patent: 2367204 (1945-01-01), Cousino
patent: 3025568 (1962-03-01), Hardy
patent: 3093865 (1963-06-01), Peters et al.
patent: 3116516 (1964-01-01), Moslo
patent: 3127637 (1964-04-01), Rex
patent: 3191233 (1965-06-01), Linderoth, Jr.
patent: 3396431 (1968-08-01), Kovach et al.
patent: 3526929 (1970-09-01), Coupland
patent: 3819313 (1974-06-01), Josephsen et al.
patent: 3847525 (1974-11-01), Bielfeldt et al.

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