Friction Between Wood and Pulpstone in Grinding: Effects of Feed and Shear, 2001 Pulping Conference Proceedings
P. Soini, B. Lonnberg--Wood fibres are evidently treated differently during grinding dependent on for example their morphology or
moisture content as has been shown earlier. Grinding direction has also been discussed, particularly transversal and
longitudinal grinding. However, more interesting perhaps is to understand how wood is ground in different directions
relative to the middle lamella, because it has variable thickness. The middle lamella is normally thicker in the
direction of the radius in a log cross cut, than in the tangential direction. Grinding direction is defined as the
direction of the compression force relative to the annual ring. Accordingly, the grinding direction may appear at a
certain angle (<90 degrees="" or="">90 degrees) to the annual ring, or perpendicularly (90 degrees) to the annual ring.
Friction Between Wood and Pulpstone in Grinding: Effects of Feed and Shear, 2001 Pulping Conference