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Studies on the Manufacfture of Hardboard from Keora Wood.

Mr. M. S. Khan
Senior Research Officer
Pulp and paper Division, Bangladesh Forest Research Institute, P. O. Box 273, Chittagong-4000, Bangladesh

Abstract/ Executive Summary:

Keora wood was pulped by steaming the chips under 10 kg/cm²and 7 kg/cm²pressures each for half hour, one hour and one and half hour. The pulps were refined to two different free nesses in each case. Hardboards were made from these pulps without using any sizing materials or additives and tested for strength and water absorption properties. The boards were moderate in strength and water resistance.

Keywords: Sunderbans, Keora wood, Hardboard, Steaming, Water resistance

Location: Bangladesh Forest Research Institute, Chittagong.

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Keora

Objectives:

To investigate the suitability of keora (Sonneratia apetala) for making hardboard.

Methodology:

Several keora logs were sawn to 9 cm x 9 cm x 200 cm size and then chipped to approximately 2.5 cm x 1.3 cm x 0.3 cm size chips.The chips were cooked by direct steaming in a stainless steel rotary digester of 0.02 m³ capacity under 10 kg/cm² and 7 kg/cm²digester pressures for half hour, one hour and one and half hour in each case. They were then refined in a single-rotating disk attrition mill at two settings so as to obtain two pulps of different freenesses.A mat was formed in the defibrator freeness tester-cum-mat former out of a 10 litre volume slurry of 128 gms O.D. pulp in water. Stock freeness was recorded. The mat was then cold-pressed.The pre-pressed mat was then placed on a caul plate with a wire screen in between and hot-pressed in a single day-light hydraulic hot press at 190°C to produce S-1-S boards. The pressing was carried out, first, for 2 minutes at 35 kg/cm² followed by a minutes breathing time at 3.5 kg/cm² and finally for another 3 minutes at 35 kg/cm² pressures. Five 24 cm diameter disks were made in this manner from each of the above pulps.The boards were tested for determining their strength and water-resistance properties. Three test specimens of 12.7 cm x 5.08 cm size were prepared from each board.The strength and water resistance properties of the boards were determined according to ASTM Standard (D 1037-52T, ASTM 1954). Water absorption tests were done by keeping the sample submerged under water at 23±2°C for 24 hours. Amount of water absorbed by the specimen and change in its thickness were measured.

Source of Information: Bano Biggyan Patrika Vol. 11: 72-74.1982

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Hardboards made from keora wood by the steaming process show deficiency in strength and water resistance properties. The pulps made by using higher cooking pressure (10 kg/cm²), however, produced moderately strong boards. From the observation of pulp freeness, it would seem that more refined pulp could give better results. The use of sizing chemical is likely to raise the board properties to the standard level.

Knowledge Management: Journal