METHOD FOR REDUCING THE EXTRACTIVES CONTENT OF HIGH-YIELD PULPS AND METHOD FOR PRODUCING BLEACHED HIGH-YIELD PULPS

摘要

The invention relates to a method for reducing the content of extractives of a high-yield pulp in a peroxide bleaching stage, said stage including peroxide bleaching and a subsequent dewatering or washing, said method comprising contacting the pulp in the peroxide bleaching with an organic stabilizer and in or after the peroxide bleaching with a surfactant, and thereafter subjecting the bleached pulp to said dewatering or washing for removing extractives along with the aqueous phase. The invention also relates to a method for producing bleached high-yield pulp.