Process for the production of paper
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United States of America Patent
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Apr 30, 1996
Grant Date -
N/A
app pub date -
Jan 3, 1994
filing date -
Jul 2, 1991
priority date (Note) -
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Abstract
The present invention relates to a process for improved dewatering and retention in the production of paper, where an anionic retention agent based on starches, cellulose derivatives or guar gums having no cationic groups and an acidic solution of an aluminum compound are added to the stock containing lignocellulose-containing fibres and optionally fillers. The pH of the stock prior to the addition of the aluminium compound should be at least about 6 to obtain the desired cationic aluminium hydroxide complexes in the stock. The present invention is cost effective and insensitive to the content of calcium in the white water.
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