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Suitability of Albizia Falcataria Wood for Cement Bonded Particleboard

D. Biswas
Bangladesh Forest Research Institute, P. O. Box 273, Chittagong 4000, Bangladesh

M. W. Sheikh
Bangladesh Forest Research Institute, P. O. Box 273, Chittagong 4000, Bangladesh

S. M. Hasnin
Bangladesh Forest Research Institute, P. O. Box 273, Chittagong 4000, Bangladesh

M. Ali
Bangladesh Forest Research Institute, P. O. Box 273, Chittagong 4000, Bangladesh

Abstract/ Executive Summary:

Albizia falcaiaria wood has been studied for the suitability of manufacturing cement bonded particleboard. This species failed to produce board in workable conditions with the untreated chips. A substantial improvement of properties was observed when the boards were made with the chips treated in cold water. The boards were tested for determining the strength and dimensional stability. The product was found to be dimensionally stable after soaking in water. Even though bending strength was found to be low, the tensile strength passed the standard specification. Cement bonded particleboard made with this species can be used where dimensional stability is necessary.

Keywords: Dimensional stability, Inorganic binder, Particleboard, Portland cement

Location: Bangladesh Forest Research Institute, Chittagong

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Wood

Objectives:

To evaluate the suitability of Albizia falcataria in the fabrication of cement bonded wood composites.

Methodology:

A log of Albizia falcataria was peeled to 1.5mm thick veneer. Before converting the veneer into particles, all identifiable defects (e.g. knots) were removed. The veneers were then hammermilled to chips and sieved through 20 mesh screen to remove dust and fines. These were then soaked in cold water for 48 hours and dried to 12-14% moisture content. Particleboards were made with these chips at a density of 1000 kg/m³ using wood cement ratio of 30:70 at 45% mat water content. Ordinary portland cement collected from the local market was used. Measured quantity of wood chips and cement were taken to which 2% CaCI2 (on the weight of cement) was added to increase the compatibility of the chips with cement. CaCI2, mixed with water, was added to wood and cement which were then thoroughly mixed by hand until a uniform mixture was obtained. Mat was formed manually in a 50cm x 50cm wooden frame and cold-pressed to a target thickness of 12mm applying 140 PSI pressure for 24 hours. The panels were then stripped off the caul plates and kept vertically for three to four weeks for final curing. Samples were prepared from five replicate boards and conditioned at 65 ± 5% relative humidity and 20 ±2^oC temperature until a uniform moisture content of about 9 to 10% was attained. Tests were performed according to BS 5669 part 1:1989. Thickness swelling and water absorption were determined after prolonged soaking in water for 27 days.

Source of Information: Bangladesh Journal of Forest Science, Jan-June. 1997, Vol.24(2), pp:62-67, ISSN:1021-3279.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The study indicated the potential of Albizia falcataria for the manufacture of cement bonded particleboard. The water soluble chemicals present in the species that may inhibit the setting of cement, however, should be removed by cold water extraction. The tensile strength and the thickness swelling property of the board were observed to meet the standard but rather low in bending strength. This property, however, could be compensated by increasing the density level and by using longer and thinner flakes.

Knowledge Management: Journal