THE EFFECT OF FIBER COMPOSITION AND BEATING PROCESS ON SURFACE STRENGTH OF OFF-SET PRINTING PAPER

摘要

In production, the surface strength of paper will be changed by adjustment of fiber composition and beating process. But in most mills, these adjustments are often based on some experience. There is not a science theory for guiding these adjustments. This article studied the factors which influence the surface strength of off-set printing paper. Through a series of tests, a model has been found. This model could guide the adjustment about fiber composition and beating process. And then a pilot scale test about this model has been carried out in Henan. The conclusion indicated that surface strength, printability and other strength indexes have been improved by adjustment of fiber composition and beating process scientifically. The ratio of softwood pulp has been reduced from 28% to 23%~25%. And the surface strength has been increased from 0.8~1.2m/s to 1.5~1.8m/s. Furthermore, when the ratio of softwood pulp is 23% and chemimechanical pulp is 7%, the off-set paper still has a good printability.