Method for producing paper or the like
AssigneeApplied Chemicals Handels-GmbH
InventorAlexander Frank
Life of this patent
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Abstract
In a method for manufacturing paper or the like, in which cationic polymer microparticles comprised of polyacrylamide and a fine-particle inorganic component are added to the paper pulp following the final shearing step and prior to the headbox, whereupon the paper pulp is subjected to dehydration while forming sheets, followed by sheet drying, a polymer mixture comprising a linear cationic polymer and a linear anionic copolymer, whose overall ionicity is anionic, is additionally added immediately prior to the headbox.
Claims14
A method for manufacturing paper or the like, in which cationic polymers comprised of polyacrylamide and a fine-particle inorganic component are added to the paper pulp following the final shearing step and prior to the headbox, whereupon the paper pulp is subjected to dehydration while forming sheets, followed by sheet drying, characterized in that an alkali-activated bentonite having a silicon dioxide content of less than 2% by weight, in particular an alkali-activated bentonite essentially completely consisting of montmorrillonite, is used as said fine-particle inorganic component and that a polymer mixture comprising a linear cationic polymer, namely a polydiallyl dimethyl ammonium chloride having a cationic charge of about 6 mol per kg dry product and a linear anionic copolymer, whose overall ionicity is anionic, namely a copolymer of acrylamide and sodium acrylate at a molar ratio of acrylamide to sodium acrylate of 50:50 to 70:30 and an anionic charge of about 4 mol per kg dry product, is additionally added immediately prior to the headbox.
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Dependencies are inferred from the claim text.