PAPER MANUFACTURE PROCESS Russian patent published in 2002 - IPC

FIELD: paper-and-pulp industry. SUBSTANCE: paper is made from suspension containing cellulose fibers and optionally fibers. Invention is characterized by adding a dehydration and retention agent, in particular cationic or amphoteric polysaccharide, after which suspension is formed and dried on screen, said polysaccharide hydrophobic group including aromatic group or said polysaccharide having general formula P-(-A-N⁺(R₁R₃)-R₂)_pX^-, wherein P represents polysaccharide residue; A represents a group over which nitrogen is connected to polysaccharide residue; each of radicals R₁ and R₂ represents hydrogen or C1-C3-alkyl; R₃ is hydrophobic hydrocarbon group containing at least 2 carbon atoms; n is integer from about 2 to about 300000; or radicals R₁, R₂ and R₃ form together with nitrogen atom aromatic group containing 5 to 12 carbon atoms; and X^- represents an anionic counterion. EFFECT: improved dehydration and/or retention, increased running velocity of papermaking machine, and improved economical efficiency of process. 20 cl, 4 tbl, 15 ex