High grade polyethylene paper
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United States of America Patent
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Sep 10, 1991
Grant Date -
N/A
app pub date -
Sep 20, 1990
filing date -
Sep 20, 1990
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Expired
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Abstract
A process is disclosed for producing high grade synthetic paper containing at least 97 wt. % polyethylene on conventional continuous wet-lay paper-making equipment. In particular, the process comprises preparing a pulp furnish of 97-99.5 wt. % oriented polyethylene fibers and 0.5-3.0 wt. % polyvinyl alcohol fibers and depositing the fibers on the forming screen of a conventional wet-lay paper machine. The resulting waterleaf sheet is then dried on heated PTFE-coated drying cans, using a particular drying profile to reduce sticking and elongation, and then thermally bonded to provide a polyethylene paper having high strength, low defects and excellent uniformity. A process for producing the pulp fibers used in the paper-making process is also disclosed.
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