Non-return device at the screwhead of screw injection molding ma

Details Non-return device at the screwhead of screw injection molding ma Non-return device at the screwhead of screw injection molding ma

1980-10-17

1982-09-14

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137528, 417459, 417513, 425562, B29F 104

Patent

active

043490441

ABSTRACT:
In a screw injection molding machine comprising a non-return device at the screwhead, said device comprising a pressure ring which is displaceable on the screwhead between front and rear abutments, is guided in the cylinder by its outer periphery and defines a flow gap with its inner periphery, a check valve for closing the flow gap against reverse flow is disposed near the front of the pressure ring whereby to facilitate rapid response of the non-return device without loss of material and obtain a substantially constant weight of injected material, particularly in the case of materials of low viscosity. The check valve may comprise a lightweight washer or valve ring.

REFERENCES:
patent: 219754 (1879-09-01), Newman
patent: 3007202 (1961-11-01), Wucher
patent: 3319299 (1967-05-01), Kiraly
patent: 3558244 (1971-01-01), Uchiyama

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