Plastic extruder with automatic shut-off valve

Details Plastic extruder with automatic shut-off valve Plastic extruder with automatic shut-off valve

1991-11-08

1992-11-17

Simmons, David A.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including restriction upstream of shaping orifice and...

425564, 425DIG225, 29C 4700, A29C 4700

Patent

active

051642077

ABSTRACT:
A plastic extruder having a rotating helical screw within a cylindrical shell. An automatic shut-off valve is mounted at the forward end of the helical screw. The valve includes a unitary or integral valve body and a poppet which is axially movable and is rotatable relative to the valve body. A rearwardly extending axial bore is provided at the forward end of the screw and the valve body extends into and is secured to the screw within said bore. The poppet has an axial stem which extends through the valve body into the axial bore. A compression spring is mounted on the rearward end of the poppet stem to act cooperatively with respect to the poppet to urge the poppet against a seating surface of the valve body and maintain the valve in a normally closed position. Flow of plastic through the valve upon rotation of the screw causes the valve to open. However, the valve automtically closes upon cessation of screw rotation to prevent back-flow of plastic during the injection step.

REFERENCES:
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patent: 4681528 (1987-07-01), Maruyama et al.
patent: 4850851 (1989-07-01), Dinerman
patent: 4966539 (1990-10-01), Pena
patent: 5002717 (1991-03-01), Taniguchi

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