The wood and pulping properties of Chir pine (Pinus roxburghii Sarg.)- Part-II- Laboratory pulping studies
The wood and pulping properties of Chir pine (Pinus roxburghii Sarg.)- Part-II- Laboratory pulping studies
K.M. Siddiqui
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 in this article. 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, hand sheets
prepared from the pulp of 26 - 35 years-old trees had
higher breaking length and burst strength and lower tear
strength than those of 36 - 45 years and higher age
groups. The bleach response of pulps made from the three
groups was almost identical and pulps of about 850GE
brightness were obtained after a four stage (CEH1 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 20 - 22kg on oven-dry wood and per ton of
oven-dry pulp basis respectively.
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December 1983
Vol. 33, Iss. 4
