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CHEMICAL PULPING AND WALLBOARD EXPERIMENTS WITH SUNDRI (HERITIERA MINOR) WOOD

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Title:
CHEMICAL PULPING AND WALLBOARD EXPERIMENTS WITH SUNDRI (HERITIERA MINOR) WOOD
Author: RAZZAQUE,M.A
Subjects: ABSORPTION ; MANUFACTURING ; MECHANICAL PROPERTIES ; PHENOLIC PLASTICS ; PREPARATION ; TREES ; WOOD ; WOOD PULP
Description: Kraft, neutral sulfite semichemical, and cold soda pulps from East Pakistan were prepared and evaluated, and the suitability of low-chemical cold soda and steam-cooked pulps for making hardboards determined. Experiments were conducted to determine the feasibility of making medium-density and insulation boards from steamcooked pulps by press-drying. The strength of the pulps compared favorably with that of pulps from such North American broad-leaved species as aspen. The tearing strength of the sundri kraft pulp was higher than that of most hardwood kraft pulps. The strength properties were better than those obtained from gewa, another hardwood species from East Pakistan. Sundri chips, softened by cold soda impregnation and reduced to high-yield pulp in an attrition mill, were used for making hardboards. Heat-treated hardboards, containing 1% phenolic resin, were of good flexural stren th and fairly resistant to water. Hardboards with better water resistance can be expected from freshly cut wood than from the stored wood used in these experiments. The hardboards made with defibrated pulps possessed good water absorption characteristics. (Author)
Creation Date: 1962
Language: English
Source: DTIC Technical Reports

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