EXPERIENCE CONFIRMS THE VALIDITY OF COMPACT PAPERMAKING SYSTEMS

摘要

The principles of the compact systems, comprising stock mixing and closed hydraulic circulation systems based on centrifugal deaeration are described. Flexible cascade coupling of the cleaners and compact suction sealing solutions contribute to compactness.rnThe experience from four installations operating prove that compact systems provide a number of advantages over conventional solutions. Up to 85 % reductions in grade change times are reported. The systems have proven to be cleaner and easier to operate than larger ones.rnCentrifugal degassing has proven to be efficient and drainage improvements up to 20 % reached due to reduced gas content. No disturbing pulsations have been seen and also and basisweight profiles are as good or better than before. In one case wet end breaks were reduced by 80 %.rnThe wet end process energy consumption was reduced 25 % due to elimination of pumps and tanks when eliminating vacuum deaeration. Additives consumption, specially slimicides has been reduced.rnThe authors believe that compactness offers significant advantages over large volume systems.