METHOD OF PREPARING PAPER-MAKING STOCK Russian patent published in 1999 - IPC

FIELD: preparation of paper-making stock for production of letterpress paper and paper for books and magazines. SUBSTANCE: method includes preparation of aqueous-fiber dispersion from cellulose. Stock is filled and calcined. Coagulant is used in the form of aluminum sulfate and flocculant is used in the form of synthetic water-soluble plastigel presenting copolymer with alternating structure of links of acrylic and phenylacrylic acids, phenylacryloamide and aluminum salt of acrylic acid, and subjected to chemical modification - cross-linking of macromolecules. The method increases degree of holding paper-making stock on forming table of paper-making machine and degree of keeping the filler. EFFECT: improve paper properties, reduced consumption of flocculant and wood. 2 cl, 1 tbl