Flocculation method for making a paper sheet
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United States of America Patent
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Jun 17, 2003
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N/A
app pub date -
Mar 9, 2001
filing date -
May 28, 1998
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Abstract
According to the present invention, a cross-linked polymer or copolymer formed by reverse phase emulsion polymerization from suitable water-soluble monomers or from mixtures of such monomers is used as a retention agent. The process according to the invention is characterized in that the cross-linked polymer is sheared before its introduction or injection into the suspension to be flocculated. This results in a distinct improvement in the retention, formation, drainage and other properties of the paper or paperboard sheet thus obtained, as a function of the shearing.
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