Glue-bond strength of simul (Bombax ceiba) plywood made of Neem (Azadiracta indica) leaves treated veneers

IRG/WP 13-40647

K Akhter, M A Hashem, S Akhter

The glue-bond qualities of plywood made of treated simul (Bombax ceiba) veneers were investigated. The veneers were treated with cold and hot water solution of neem (Azadiracta indica, A. Juss.) leaves of different concentrations and treatment durations. The plywoods were made at three different pressures in hot press using urea formaldehyde glue. The glue-bond strength of untreated simul plywood in dry shear-test were found to be 2.17 and 2.29 N/mm2 made at 1.05 and 1.40 N/mm2 pressure respectively. It was observed that the glue-bond strength of neem leaves cold water treated (1:10) simul plywood in dry shear-test were 2.01 to 2.29 N/mm2 made at 1.05, 1.40 and 1.76 N/mm2 pressure. It was found that the values of load at failure of treated simul plywood in dry shear-test were gradually decreased with the increasing treatment duration and concentration of solution. For maximum treatments, lower values of shear strength were observed in plywood made of hot water-treated veneer compared to that of cold water-treated veneer. However, the values of glue bond strength in all Neem Leaves (NL) treated plywood met ‘A-grading’ requirement for gluing.

Keywords: Bombax ceiba , bond strength, neem leaves, Azadiracta indica, A Juss, urea formaldehyde glue, hot press

Conference: 13-06-16/20 Stockholm, Sweden

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