Production of paper and paperboard
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Jan 2, 1992
filing date -
Jan 2, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Paper or paperboard is made by forming an aqueous cellulosic suspension, passing the cellulosic suspension through one or more shear stages, draining the suspension to form a sheet and drying the sheet, wherein the cellulosic suspension that is drained includes organic polymeric material and inorganic material, wherein said organic polymeric material is a flocculant having a molecular weight above 500,000 and is added to the suspension before one of the said shear stages and wherein said inorganic material comprises bentonite which added to the suspension after that shear stage, characterised in that the organic polymeric material comprises an anionic or non-ionic polymer.
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