Production of UHMWPE sheet materials
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United States of America Patent
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Jul 19, 2011
Grant Date -
Sep 30, 2010
app pub date -
Jun 11, 2010
filing date -
Jul 21, 2006
priority date (Note) -
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Abstract
UHMWPE panels of large width may be ram extruded from a slit die in a stable process, by restraining a panel which exits the die below the crystalline melt temperature against movement away from the die by a back pressure device, so as to exert a back pressure between the back pressure device and the die, the back pressure device preferably constructed of a plurality of differentially adjustable elements so as to be able to compensate for changes in processing characteristics over time. Vertically restraining UHMWPE panels as they further cool also greatly improves product characteristics.
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