THE CONVERSION OF THE MOISTURE-STABILITY WASTE-PAPERS WITH POLYMERIC COVERING. 1. BREAK-ING-UP OF THE WASTE-PAPER
UDC 676.2.038.23.024.5:676.266
Abstract
Breaking-up of waste-paper with polyurethan and polyaziridin was studied. Paper moisture-stability is 49–51%. The waste paper reduced to the degree size of the particles 5–8 mm in the dry grind mill and chemical processing under higher temperature (to 70 °C) by sodium persulfate and hydroxide solution; duty of water 6. Cooking duration varied from 1 to 5 hours, solution strength of persulfate sodium – from 2 to 12%, hydroxide sodium – from 0.5 to 3% from the mass of bone-dry waste-paper. The secondary fiber received by breaking-up of the pulp in the hydropulper. The dependency degree of breaking-up, losses of the cellulose and liquor pH from the cooking variable factors approximated by the regression equations of the second order, which used for graphic presentation results. At the most importance of the all variable factors the cooks ended in the acid medium with pH 3 under practically full persulfate and hydroxide sodium consumption; at that the degree of the breaking-up more than 80% was reached, losses of the cellulose under the all conditions remained within the range of 12.6–14.6%. The necessary operations of the breaking-up: crush the dry waste-paper; the cooking of the waste-paper with sodium persulfate and hydrate; breaking-ap of the waste-paper in the hydropulper; washing the stringy mass by water; the hydrodynamic milling.
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