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Abstract

This report contains the first part of the results from a storage experiment carried out at Stora Enso Kvarnsveden Papermill in the summer of 2001. The experiment aimed to investigate the changes in wood and pulp properties during storage of pulpwood. Four different storage alternatives were evaluated: sprinkled and unsprinkled storage of debarked and undebarked pulpwood. The experiment was made both on wood felled in May and wood felled in June. The same stand was used for both fellings. The sprinkling of the wood was done in accordance with the principles of climate adaptation and the water was recycled. The sprinkling intensity and the calculated evaporation were registered on a daily basis during the experiment. The wood and pulp properties were measured at the start of the experiment and after four and eight weeks, respectively. The samples for MC and debarking resistance were drilled out while samples for laboratory pulping experiments, and measurement of density, fibre lengths and ring width consisted of disks. The pulping experiments shown in this report were performed in accordance with a method developed at Kvarnsveden. The method makes it possible to handle experimental wood mixed with the ordinary wood in the woodroom and thereafter to collect the experimental logs. This makes it possible to perform realistic pulping experiments using small quantities of wood. The grindings were made on the same pulpstone during the whole experiment. Results from the experiment show that the sprinkling efficiently prevented drying‐out, debarking problems and the occurrence of fungal blue stain. However, this was achieved with one major drawback; decreased brightness. The strength properties of the pulps made from sprinkled wood were comparable with those of pulps made from fresh wood. Unsprinkled storage of pulpwood gave wood with inhomogeneous MC and some blue stain infections. The pulps made from unsprinkled wood had a smaller long fibre fraction, a higher content of fines and lower brightness than pulps made of fresh or sprinkled wood. The settings of the sprinkling system were the same as those normally used at the woodyard. They were found to give a much higher sprinkling intensity than the calculated evaporation, especially on days with low evaporation. Tannin discoloration of pulpwood is known to be related to the sprinkling intensity. Therefore it is of interest to evaluate the possibilities to decrease the sprinkling intensity.

Published in

Rapport - Sveriges lantbruksuniversitet, Institutionen för skogens produkter och marknader
2002, number: 1
Publisher: SLU, institutionen för skogens produkter och marknader

SLU Authors

  • Persson, Erik

    • Forest Products and Markets, Swedish University of Agricultural Sciences

  • Fryk, Hans

    • Forest Products and Markets, Swedish University of Agricultural Sciences

UKÄ Subject classification

Forest Science

Permanent link to this page (URI)

https://res.slu.se/id/publ/3159