Investigation on the possibility of Manufacturing the Kraft pulp from Criptomeria wood

Document Type : Research Paper

Author

Head of Wood and Paper Chemistry Laboratory / Research Institute of Forests and Rangelands

Abstract

In this study chemical composition, fiber biometry, pulp and paper characteristics from Criptomeria japonica wood which has been planted in Gilan province (Pisseson region) were investigated. Mean value of specific gravity and basic density of wood were 0.376 and 0.338 gr/cm3, respectively. Also, fiber (tracheid) dimension including fiber length, fiber diameter, lumen diameter and cell wall thickness were determined at 2920, 41.23, 32.57 and 4.41µm, respectively. The chemical composition of Criptomeria japonica wood including αcellulose, lignin, extractives and ash content were analyzed. On average Criptomeria japonica wood has 48.35 % cellulose, 32.08% lignin, 0.988% ash and 5.64% extractives. The results of this investigation show that on average Pulp yield was 50.53 totally. With increase in effective alkali from 12% to 18%, pulps yield decreased and show significant differences at 1%. Breaking length of hand sheets made at 12%, 14% and 18% effective alkali were 7.36, 7.17 and 9.14 Km, respectively. It was also observed that burst strengths of hand sheets made at 12%, 14% and 18% effective alkali were 4.87, 4.93 and 6.19 Kpam2/g respectively.

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References

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