Paper and paperboard production process and corresponding novel retention and drainage aids, and papers and paperboards thus obtained
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United States of America Patent
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app pub date -
Jan 25, 2006
filing date -
Jun 4, 1998
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Abstract
The invention concerns an improved method for making paper, which uses a branched polymer prepared in invert emulsion as the main retention agent, and bentonite as a secondary retention agent (dual type system). The two additions are separated by a step for shearing the fibrous suspension (or mass). The invention results in highly improved retention and also highly improved dewatering. Moreover, it enables the bentonite content in white water to be reduced.
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