![]() | 1st Nordic Drying Conference - NDC'01, Trondheim, Norway, June 27-29, 2001 | ![]() |
LIQUID REDISTRIBUTION PHENOMENA IN PULP AND PAPER SHEETSDavid Wessman, and Stig StenströmChemical Engineering I, Chemical Center, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. E-mail: David.Wessman@kat.lth.se Keywords: liquid redistribution, pulp quality, capillary, moisture ratio ABSTRACT In an attempt to investigate the liquid redistribution phenomena, two test
samples of kraft, sulfite, ground wood, recycled and thermomechanicalpulp
differing in moisture content were placed together between two plates at a
pressure of 10000 Pa. The basis weight of the test samples were 63-90 g/m2.
Several combinations of pulps, contact times, temperatures and moisture
ratios in the sample sheets were tested. The amount of redistributed liquid
was determined gravimetrically. After approximately 1 hour no major changes
in the moisture ratios were observed. Two sheets with initially two
different moisture ratios did not reach the same moisture ratios even after
1 week. The liquid fluxes from a moist to a dryer sheet of the same quality
were in the range of 0.3-0.09 g/m2s, regardless of the initial difference
in moisture ratio used in the experiments.
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