Extrusion process and single-, dual- or multiple-screw extruder

Details Extrusion process and single-, dual- or multiple-screw extruder Extrusion process and single-, dual- or multiple-screw extruder

1988-09-22

1990-09-25

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

26421123, 264349, 366 75, 366 86, 425173, 425203, 425205, 425215, 4253824, B29C 4776

Patent

active

049591860

ABSTRACT:
In the case of the extruder, the thread of the screw, or that of the screws, is partly left-handed and partly right-handed, so that one part of the material to be processed is conveyed in direction A, while the other part is conveyed in the opposite direction B. The process is a degasifying-extrusion-process and the extruder is a degasifying extruder. The apparatus includes a reverse-degasifying assembly (7,22) at the end (8,19) of the screw (1,16), or screws (1,16), if the material to be processed is carried away from this end, and/or a reverse-degasifying assembly (41,52) at the location between the threaded sections of the screw (1,16) or screws (1,16), so that the material to be processed is carried away in opposite directions B and A. According to the invention, continuous operation is possible, no dead areas and break-away edges are formed, the reverse-degasifying assembly (7,22,41,52) is easily sealed off against any entry of oxygen, products sensitive to heat and oxidation, such as polyamide-66, may also be produced, without damage, in continuous operation, for example by synthetic-fibre extrusion spinning.

REFERENCES:
patent: 3224739 (1965-12-01), Schuur
patent: 3253303 (1966-05-01), Bradt
patent: 3256562 (1966-06-01), Heard, Jr.
patent: 3459840 (1969-08-01), Wood
patent: 3577588 (1971-05-01), Chisholm
patent: 3632256 (1972-01-01), Kasting et al.
patent: 3963558 (1976-06-01), Skidmore
patent: 4051212 (1977-09-01), Grigat et al.
patent: 4103354 (1978-07-01), Gorbatov et al.
patent: 4110844 (1978-08-01), Nakamura
patent: 4212543 (1980-07-01), Bersano

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