Reverse degasification screw extruder with vacuum seal

Details Reverse degasification screw extruder with vacuum seal Reverse degasification screw extruder with vacuum seal

1979-01-05

1981-05-05

Bleutge, John C.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

277 3, 366 75, 366139, 425107, 425203, B29B 100, B29F 303

Patent

active

042655471

ABSTRACT:
A screw extruder for processing thermoplastic materials wherein a vacuum is applied to the feed opening for the material and/or to a filling section of the cylinder for the purpose of reverse degasification, said extruder having a simultaneously rotating pressure piece between a screw and a back pressure bearing and having a stationary end piece disposed on the screw side in front of the rotating pressure piece and sealing means comprising at least two axially spaced radial sealing rings and a vacuum source to apply vacuum to an annular interspace formed between the sealing rings.

REFERENCES:
patent: 1677119 (1928-07-01), Kinyon
patent: 2064703 (1936-12-01), Van de Graaff
patent: 2432734 (1947-12-01), Doesken
patent: 2835514 (1958-05-01), McGahan
patent: 3376603 (1968-04-01), Colombo
patent: 4014555 (1977-03-01), Jacott et al.

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