Shear/Compression of Chips-A Way of Collapsing Fibres With Low Energy Demand, 2007 International Mechanical Pulping Conference

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.



Shear and compression are probably the main types of fibre deformation occurring in refiners for collapsing and fibrillating fibres into a suitable pulp. In current refiners, the repeated mechanical action of the bars is almost random on the fibres and consumes large amounts of energy. A more suitable application of shear and compression forces during the refining process could be a way to develop fibres at a lower energy demand. These ideas have been studied in this work trying to find new ways of saving energy in the mechanical pulping process.

One way of application of the shear/compression treatment is by producing wood shavings instead for wood chips. Reductions of the energy demand in refining involving a limited shear combined with compression forces could also be achieved by a pre-treatment of wood chips in a roll nip prior to refining or by an intermediate stage of mechanical treatment of 1^st stage refined TMP coarse fibres.