Twin screw extruder and an extruding method using the same

Details Twin screw extruder and an extruding method using the same Twin screw extruder and an extruding method using the same

1996-07-18

1998-03-17

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

26421123, 264349, 425203, 425204, B29C 4776, B29C 4740

Patent

active

057283370

ABSTRACT:
Each of two screw bodies includes a feed screw and a kneading screw. The feed screw is formed of a wide-flight 1-lobe intermeshing screw designed so that the ratio W.sub.0 /D of the flight width W.sub.0 thereof to the screw diameter D ranges from 0.2 to 0.4. The kneading screw includes a plurality of double tipped kneading discs designed so that the ratio W/D of the width W thereof in the axial direction of the screw bodies to the screw diameter D ranges from 0.3 to 1.0, and displaced from one another in the circumferential direction of the kneading screw, the angle by which any two adjacent kneading discs being displaced range such that at least a backflow of an extrusion material can be prevented.

REFERENCES:
patent: 4113822 (1978-09-01), Takiura et al.
patent: 4663103 (1987-05-01), McCullough et al.
patent: 4895688 (1990-01-01), Shigetani et al.
patent: 4940329 (1990-07-01), Dienst
patent: 5000900 (1991-03-01), Baumgartner
patent: 5106564 (1992-04-01), Iwanami et al.
patent: 5158725 (1992-10-01), Handa et al.
patent: 5173230 (1992-12-01), Colombo
patent: 5264174 (1993-11-01), Takei et al.

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