METHOD FOR MANUFACTURING MULTILAYER PAPER OF UNBLEACHED PULP UTILIZING TWO-STEP CONTINUOUS SYNTHESIS REACTION METHOD OF PRECIPITATED CALCIUM CARBONATE

摘要

The present invention relates to a two-step continuous synthesis reaction of precipitated calcium carbonate (PCC) of synthesizing white precipitated calcium carbonate (PCC) in unbleached pulp, which has the effect of replacing conventional bleaching processes to thereby reduce toxic substances by a bleaching agent, reduce costs for the bleaching process, reduce environmental pollutants generated due to the bleaching agent, and enhance the whiteness of the unbleached pulp. In addition, the present invention relates to a method for manufacturing multilayer paper by utilizing unbleached pulp comprising precipitated calcium carbonate (PCC) through a two-step continuous synthesis reaction of the precipitated calcium carbonate (PCC).