METHOD FOR REDUCING RESIDUE OF COATED BURNT PAPER OR CARDBOARD, METHOD FOR REDUCING WEAR OF GAUZE USED IN PAPER OR CARDBOARD PRODUCTION, COATED FIBROUS ROLL MATERIAL Russian patent published in 2000 - IPC

FIELD: pulp-and-paper industry. SUBSTANCE: method involves changing the amount of pigment and/or filler normally used in the process for imparting predetermined optical properties to paper and/or cardboard, and substituting it with calcium oxalate. Method for reducing wear of gauze involves introducing calcium oxalate into paper or cardboard tape or into coloring layer used as coat instead of pigments normally used in the process. Fibrous roll material with coat of whiteness corresponding to ISO standards and opacity exceeding 90% contains calcium oxalate as filler and/or pigment. EFFECT: reduced specific weight of paper or cardboard, sufficient opacity, increased strength, and improved heat and fire resistance. 17 cl, 2 dwg, 4 tbl, 4 ex