Drying Effects of Secondary Fiber On Papermachine Runnability, 1995 Papermakers Conference Proceedings

Please Note: This document will be available in PDF format in the "My Electronic Documents" link on the home page once your order has been completed. Please make sure you have the latest version of Acrobat Reader. Click on the Acrobat Reader icon to check for the latest version, it’s FREE. To print a hardcopy of a PDF file correctly you must have a postscript printer. If you are not sure if your printer is a postscript printer please refer to your owner’s manual.

Purchase of electronic (downloadable) documents made at www.tappi.org by credit cards, followed by instant download CANNOT be cancelled. We do not offer refunds on electronic download documents.

Kathie R. Rutledge-Cropsey Said Abubakr John H. Klungness USDA Forest Service Papermaking pulps from recycled wastepaper performs differ-ently on the paper machine than do similar never-dried pulps. One factor in the runnability difference is due to the differences in dried compared with never-dried fines. This study investi-gated the effect of drying on the runnability of a mixture of bleached hardwood and softwood pulps. In addition, an enzyme was used to enhance drainage of the once-dried fiber. Three paper machine runs were made, and all pulps were refined to the same freeness before papermaking. Never-dried pulp was used in the first run. Dried product from the first run was used for the furnish in the next two runs, one of which was treated with enzymes prior to papermaking and the other was not treated (control). The enzyme treatment was done to reduce the degree of hornification of the fines and improve drainage. The enzyme treatment consisted of adding a cellulase with a high filter paper activity to the pulp slurry after fiberizing. After the treat-ment, the pulp was refined to the original freeness. In each paper machine run, paper machine drainage, wet-web strength, pulp viscosity, and handsheet burst index were measured.