Deaeration of feed materials in an extrusion process
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Feb 10, 1999
filing date -
Jul 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for molding a raw material including a plastic material or a mixture of plastic and non-plastic materials fed into a cylinder, the said raw material is subjected to a melt-kneading performed under oxygen-free conditions, and at the same time the molten material is sent from the tip of an extrusion screw towards the head section of the cylinder in straight flow conditions. In the method satisfactory molding can be made for plastics of poor fluidity or thermal stability or for plastic materials mixed with more than 10 to 30% by weight of wood flour, paper powders, stone powders, metal powders, fiber reinforcements and the like, without causing molding defects such as burn or cavitation; and also for raw materials mixed with more than several per cent by weight of metal powders or stone powders without causing excessive wear at the extrusion screw.
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