Document Type : Research Paper
Authors
1 MSc., Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,
2 Wood and forest products division, Research Institute of Forests and Rangelands, Agricultural Resear
3 Wood and Forest Products Science Research Division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO) P.O. Box 13185-116, Tehran, Iran
4 Wood Science & Forest Products Research Division Research Institute of Forests & Rangelands Tehran, Iran
Abstract
Three 4,6 and 12 years old populus deltoides trees were randomly selected and felled from the Safrabasteh Research Station located in Gilan province. Samples were transferred to the Wood chemistry and Paper Making of Research Institute of Forest and Rangelands.
By using of kraft processing, percentage of sulfidity rate of %25, and the temperature of 165°C a addition to modification of effective alkali, up to 14%, 17%, 20% and cooking time at maximum temperature of 60 min., 120 min., 180 min., with a rate of liquide to lignocellulosics malerial equivalent at 5/1 (L/W).
Average of yield and kappa number of pulps was measured between 43.83-2.20 and 14.85-30.48 respectively.
Pulps were refined up to the freness degree of 350, 400 and 450 c.s.f for 14% effective alkali and 350 c.s.f. for 20% effective alkali. The mechanical properties of 60 grams hand-made papers include breaking length, burst Index, tear Index and folding were also measured.
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