Press wetting as an enhanced wetting method for baled OCC material, TAPPI JOURNAL January 2016



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.

ABSTRACT: A procedure to mechanically force water into the bale structures of old corrugated container (OCC) material was studied and evaluated in low-consistency pulping studies. Two mechanical methods were used in the study: (1) roll pressing of sheets and (2) press wetting of bales. Mechanical pressing was first used in simple roll tests to evaluate nip pressure as an enhanced effect on wetting. Repeated press wetting treatments were found to increase water penetration into the sheets and appeared to lower wet strengths.A simple laboratory-scale bale pressing device was constructed and the effect of different parameters in wetting method was studied. We found that when a bale was pressed under water, multiple pressings were needed to get efficient press wetting. Increased temperature was found to increase water penetration inside the porous structure of linerboard. We also discovered that there must be a delay between relaxation and pressing to allow water to trav-el within a board and to wet all surfaces. The wetting procedure also evaluated the weight of water inside the bale. Results showed that the amount of water could be used as an indicator of the pulping kinetics and energy consumption needed to disintegrate OCC. The enhanced method (i.e., hydraulic pressing) could provide efficient wetting on an industrial scale. With this method, a 30% savings in the energy consumption required in pulping unit operation is possible.

Application: Mills can use this information to evaluate use of pre-wetting before pulping to increase low-consistency pulping capacity.

Author: Heikki Upola, Ari Ämmälä, Veikko Kankaanpää, and Mirja Illikainen
Press wetting as an enhanced wetting method for baled OCC ma
Press wetting as an enhanced wetting method for baled OCC material, TAPPI JOURNAL January 2016
0.00

New Releases

 

Kraft Recovery Boilers, Third Edition  


Sponsored by the Recovery Boiler Program R&D Subcommittee of the American Forest & Paper Association (AF&PA) and published by TAPPI Press.


Purchase


 

Handbook For Pulp and Paper Technologists (The SMOOK Book), Fourth Edition

The best-selling text to introduce the entire technology of pulp and paper manufacture.

Purchase

 

Guidelines for Safe Assessment and Operation of Yankee Dryers  


A project of the Yankee Dryer Safety & Reliability Committee.

Purchase

 

Check our newest additions.


TAPPI Press offers some of the most in-depth resources and references for the forest products and related industries. 

See More

   
 

Available for Purchase – Conference Proceedings


TAPPI maintains a record of key conference papers, presentations, and other conference publications, available for purchase in a variety of formats.

See More