PAPER PRODUCTS AND A METHOD FOR APPLYING AN ADSORBABLE CHEMICAL ADDITIVE TO CELLULOSIC FIBERS.

摘要

Chemical additives can be adsorbed on cellulosic papermaking fibers at high levels with a minimal amount of unadsorbed chemical additives present in the papermaking process water. A method includes treating a fiber slurry (20) with an excess of the chemical additive (24), allowing sufficient residence time for adsorption to occur, filtering (14) the slurry to remove unadsorbed chemical additives, and redispersing the filtered pulp with fresh water (35). Filtrate (32) from the thickening process contains unadsorbed chemical additive and it is not sent forward in the process with the chemically treated fibers. The method can be employed to make improved paper products.