Plywood manufactured from rubberwood
1993
Songklod Jarusombuti
Investigations were made to study the plywood manufactured from boron treated rubberwood (Hevea brasiliensis Muel. Arg.) dy dip-diffusion treatment of veneers and incorporating boron compounds in the glueline of plywood. Three concentrations of boron compounds were used in veneers treatment, i.c. 1 %, 3 % and 5 % incorporated with sodiumpentachlo rophenate (NaPCP) 0.1 % in all solutions. Rubberwood veneers dipped in boron solutions of three concentrations and stored under a cover of plastic sheet for 5 minutes, 10 minutes and 15 minutes had clean surface without fungi after leaving in the indoor open air for seven days. From the quantitative test of boron compounds, these veneers had boric acid equivalent (BAE.) content in the core not less than 0.20 % which protecting wood from powder-post beetles infestations. The plywood made from rubberwood veneer in all concentration of soluting and every duration of storing time gave equally the 100 % of boron penetration. The bonding strength of glueline from the strip shear test of plywood made from treated rubberwood veneers and boron mixed glue was not less than 77 Newton/square m. The specific gravity of 4 mm and 10 mm thick plywood ranged between 0.72-0.74. The cost of dried and clipped rubberwood veneers is less than dried and clipped Yang (Dipterocarpus spp.) veneer about 56.71 percent. And the cost of plywood from rubberwood is less than plywood from yang about 44.52 percent.
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