Document Type : Research Paper

Authors

• Abas Fakhryan ¹
• Fardad Golbabaei ²
• Mohammad mehdi Brazandeh ¹

¹ M.Sc.., Wood and Forest pruducts Research Division, Research Institute of Forests and Rangelands, Iran

² 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

Abstract

In this research pulp and paper making characteristics of Sequoia sempervirens from Chamestan noor research station were studied. The dry and critical specific gravity of sap wood 0.352 and 0.324, heart wood 0.43 and 0.40, fiber length 2.01 mm. diameter 39.84µm. lumen 33.15µm and cell thickness wall 2.89µm were measured as respectively. The amount of  cellulose of 52.63%, lignin 35.32%, ext. 6.68% and ash 0.45% were obtained as well. Kraft process was used for pulping. The yield of these pulps in 12% effective alkali were measured as 56% and in 18% effective alkali 39.69% respectively. In 3 hours of cooking time, the tear strength of these pulps 19.74 mNm2/gr  and In 2 hours of cooking time 15.22 mNm2/gr respectively  were measured.
 

Keywords

• Sequoia sempervirens
• KRAFT PROCESS
• yield-kappa number
• tear strength
• Burst Strength

Main Subjects

• Pulp and paper