Extrusion method, extruder and extruded product
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United States of America Patent
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-
Mar 20, 2001
Grant Date -
N/A
app pub date -
Sep 17, 1998
filing date -
Apr 29, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An extruder according to the invention comprises at least two annular conical feed gaps (9) one within the other, formed between a rotatable rotor (1) and a stator (4, 5). At least some of the material to be extruded is subjected in the different feed gaps (9) of the extruder alternately to a higher pressure and then to a lower pressure. The rotor (1) or stator (4, 5) between the feed gaps (9) can then be balanced such that the pressure effect provides a hydrodynamic bearing, whereby, when the extruder is used, even at worst a very small force is exerted on die other bearings of the rotor (1) or stator (4, 5). By the method of the invention, a product can also be produced which contains cross-linked and at least partly oriented polyethylene.
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