Paper production
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United States of America Patent
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Mar 27, 1990
Grant Date -
N/A
app pub date -
Jan 6, 1988
filing date -
Jan 9, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for obtaining retention of the manufacture of paper, whereby one adds a cationic, high polymer polysaccharide at the preparation of a stock of paper pulp; that one adds an anionic aluminium compound, or a combination of an aluminium salt and an alkali or an acid to the formation in situ of such an anionic aluminium compound immediately prior to the head box, whereby pH immediately prior to the head box is kept at pH 7 to 8.
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