Extrusion process and single-, dual- or multiple-screw extruder
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Sep 22, 1988
filing date -
May 27, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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