Production of paper and paperboard
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 28, 1988
Grant Date -
N/A
app pub date -
Jan 27, 1987
filing date -
Jan 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Paper or paper board is made by passing an aqueous cellulosic suspension through a centriscreen or other shear device and then draining the purified suspension, and an improved combination of retention, drainage, drying and formation is achieved by adding to the suspension an excess of high molecular weight linear synthetic cationic polymer before shearing the suspension and adding bentonite after shearing.
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