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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S. K. Nath ¹, K. K. Mohandas ¹

Affiliations
1 Indian Plywood Industries Research and Training Institute Tumkur Road, Yeshwanthpur P.O. Bangalore – 560022, IN

Abstract

Chir pine needles are modified leaves from chir pine (Pinus roxbughii) trees, a major species in the temperate Himalayan forests. Under the present work, pine needles were used as raw material for making particle boards. Pine needle in its natural form is difficult to process and bond with conventional resin polymer into panel product. The nonporous surface of the needle is difficult to wet by resin. These problems were solved by cutting the needle into smaller sizes and bonding was improved by using specially made cardanol-phenol-formaldehyde resin. Glued and dried pine needles were drawn into mat and hot pressed to get panel products for various end uses. Process parameters varied to optimize strength properties of the products. Particle board made out of pine needles conforms to all properties of wood Particle Board as per IS: 3087 except MOR and MOE. Ceiling tiles of various designs were developed from glued pine needle as well as pulverized pine needle powder. Pine needle particle board (plain and design) was used as panel door infill and small tea-poy top to demonstrate the application potential.

Keywords

Particle Board, Chir Pine Needle, Pinus roxburghii

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