METHOD FOR PRESSED LIGNOCELLULOSE MATERIAL MANUFACTURING Russian patent published in 1995 - IPC

FIELD: pulp and paper industry. SUBSTANCE: wet wood filler is ground, dried and mixed with technical lignosulfonate. Thus obtained mixture is then formed and pressed. Mentioned above technical lignosulfonate is preliminary treated with mineral acid till its pH is 0.3-2.0. After mixing with treated lignosulfonate said filler is dried to humidity 3-13 %. Mentioned above pressing is carried out at pressure 3-8 Mpa, its duration is 1-2 min allowing for millimeter of thick of desired material. Wood shavings or saw dust or their mixture may be used as wood filler. Quantity of origin lignosulfonate is 18-65 % of absolutely dry filler mass. EFFECT: improves efficiency of the method. 2 cl, 1 tbl