High yield fiber sheets
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United States of America Patent
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-
Jan 27, 1981
Grant Date -
N/A
app pub date -
May 21, 1979
filing date -
May 21, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Wet-laid sheets of softwood high yield fibers in combination with hardwood high yield fibers. The sheets, which are strong enough to be handled by commercial equipment, are formed on conventional papermaking machines using a furnish comprising a major proportion of softwood high yield fibers in admixture with a minor proportion of hardwood high yield fibers. The hardwood high yield fibers are specially prepared by a procedure comprising treating hardwood with relatively high levels of chemicals under relative stringent conditions and defibrating the treated hardwood with relatively high levels of power input. Airfelts made from these sheets exhibit low wet densities. Processes for making the sheets and the airfelts are also provided.
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