Informatics Publishing Limited

N. D. Uday , K. C. Mathews , K. K. Mohandas , H. N. Jagadish , A. K. Bansal

Abstract

The technology of finger-jointing of plantation grown timbers for producing bigger sizes is gradually gaining momentum in the country. One of the constraints in this process is the high cost of imported finger-jointing machines. Recently, the Building Materials & Technology Promotion Council (BMTPC), New Delhi, an inter-ministerial organization of the Government of India has developed finger-jointing machines which were installed at indian plywood Industries Research and Training Institute (lPIRTI), Bangalore for research and training purposes. At IPIRTI a study was carried out to evaluate the strength of finger-jointed timber produced from plantation grown species viz. Gravellia robusta (Silver oak), Eucalyptus tereticornis, (Eucalyptus) and Havea brasiliensis (Rubber wood). it was found that fingerjointed timbers from plantation species have strength in the range of 60-73% of defect free solid timber from- the respective species.

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K. C. Mathews , K. K. Mohandas , N. D. Uday , D. Sujatha , A. K. Bansal

Abstract

Plywood industry presently utilizes lesser known hardwoods and plantation timbers for the manufacture of plywood. In continuation of the studies of these. species for plywood manufacture, an investigation was undertaken to find out the peeling, drying and gluing characteristics of Paraserienthes odoratissima Benth. and Paraserienthes lebbek Benth. and provide necessary information on optimum processing conditions for plywood manufacture. Studies showed that type B surface veneers could be peeled with suitable modifications in lathe settings. Drying of the veneers was possible without major drying degrades. Gluing characteristics of the species were good with both Urea formaldehyde and Phenol formaldehyde resin adhesives for making MR grade and BWR grade plywood respectively.

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