Extruder with roller die

Details Extruder with roller die Extruder with roller die

1980-06-10

1981-12-08

Thurlow, Jeffery R.

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

264 407, 264175, 264176R, 366 88, 425147, 425149, 425208, 425327, 425363, 425376B, 425DIG235, B29F 3012

Patent

active

043045391

ABSTRACT:
An extruder with a roller die in which a plastic or rubber material fed from a mixer is formed into a sheet by a roller die located at the fore end of a screw feeder which includes a cylinder and a revolving screw, the screw feeder employing a short screw shaft which has its base portion rotatably supported in the cylinder and a non-contacting screw portion essentially including a feed portion and a compression portion and disposed in the cylinder with a small gap being formed between the screw portion and the inner periphery of the cylinder. The pressure distribution in the screw feeder is controlled such that the maximum pressure in a compression zone and the pressure at the fore end of the cylinder are maintained in the ranges of 52.times.10.sup.3 to 200.times.10.sup.3 gr/cm.sup.2 and 20.times.10.sup.3 to 60.times.10.sup.3 gr/cm.sup.2, respectively.

REFERENCES:
patent: 3274645 (1966-09-01), Chase
patent: 3359597 (1967-12-01), Bainton
patent: 3393426 (1968-07-01), Meienberg
patent: 3482279 (1969-12-01), Anders et al.
patent: 3543333 (1970-12-01), Anders et al.
patent: 3694120 (1972-09-01), Walton
patent: 3932086 (1976-01-01), Kasamatsu
patent: 3947201 (1976-03-01), Ellwood
patent: 3954366 (1976-05-01), Fields
patent: 4028031 (1977-06-01), Seide

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