METHOD FOR PREPARATION OF PAPER MASS FOR PRODUCTION OF CARDBOARD Russian patent published in 2016 - IPC D21H21/10 D21H17/45 D21H17/37 

FIELD: textile and paper.

SUBSTANCE: invention relates to production of cardboard from waste paper, and can be used in cardboard and paper industry. Method for preparation of paper mass for production of cardboard involves treatment of initial raw material to produce paper mass with preset concentration and introducing filler into it as fibre retaining system. Initial raw material used is waste paper in form of pulp and paper products wastes. Fillers are synthetic substance polydiallyldimethylammonium chloride synthesised from allychloride and dimethylamine as coagulant, as well as micropolymer, which is combination of polyacrylamide and alumina at ratio of 70:30. At that, said paper mass is added to micropolymer as flocculant, and as coagulant. Method provides retention of starch in pulp for up to 51.5 %, holding cellulose fibres to 91.3 %, water loss of mass up to 70 %.

EFFECT: production of cardboard with improved physical and mechanical properties.

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