Papermaking process
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United States of America Patent
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Dec 25, 1990
Issued Date -
N/A
app pub date -
Jul 17, 1989
filing date -
Apr 3, 1985
priority date (Note) -
Expired
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Abstract
In a process for making paper from an aqueous paper pulp, especially a pulp containing bleached/unbleached mechanical pulps or unbleached chemical pulps, a combination of chemicals is added for improving drainage and retention. As drainage-and retention-improving aids are added a cationic polyacrylamide and a sol of colloidal inorganic particles having at least one surface layer of aluminium silicate or aluminum-modified silicic acid.
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