Abstract:
The physical, anatomical and chemical properties of chir pine wood were described in the first part. The pulping studies on wood samples of this species on laboratory scale are presented. Trial cooks were made to determine the most suitable kraft (sulphate) pulping conditions for producing bleachable pulp with Kappa number of about 25 from 15 chir pine trees of three age groups. In laboratory tests trees of 36-45 years age gave maximum pulp yield. However, handsheets prepared from the pulp of 26-35 year-old trees had higher breaking length and burst strength and lower tear strength than those of 36-45 years and higher age group. The bleach response of pulps made from the three groups was almost identical and pulp of about 85°GE brightness were obtained after a four stage (CEH H2) bleaching sequence. The presence of resin in chir pine wood did not constitute any special problem during its pulping. The values of tall oil were found to be about 1% and 2022 kg on oven-dry wood and per ton of oven dry pulp basis respectively.
Page(s):
189-200
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Forestry, Volume: 33, Issue: 4, Year: 1983