Screw-type extruder having a starting valve and throttle

Details Screw-type extruder having a starting valve and throttle Screw-type extruder having a starting valve and throttle

1989-04-21

1991-01-15

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425185, 425186, 4253823, 4253824, B29C 4710, B29C 4792

Patent

active

049849778

ABSTRACT:
A screw-type extruder has a housing and at least one screw which is rotatably arranged in a bore in the housing and which conveys material while melting or plasticizing in a conveying direction to a discharge channel, a starting valve and a throttle for generating a back pressure on the molten or plasticized material being arranged in the area of the discharge channel. In order to avoid long flow paths of the molten or plasticized material via the throttle and starting valve, there is provided a starting valve/throttle unit having a starting valve and throttle body which is displaceable at right angles to the conveying direction out of a starting position into a throttling position.

REFERENCES:
patent: 3236253 (1966-02-01), Symmons
patent: 3589163 (1971-06-01), Byrne et al.
patent: 4136968 (1979-01-01), Todd
patent: 4213747 (1980-07-01), Friedrich
patent: 4283168 (1981-08-01), Miller et al.
patent: 4416605 (1983-11-01), Konno et al.
patent: 4507072 (1985-03-01), Gaul, Jr.
patent: 4846651 (1989-07-01), Matsuda et al.

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