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島根大学農学部研究報告 2 巻
1968-12-15 発行
木材接着に関する研究(第5報) : 微視的観察によるフェノールおよびメラミン樹脂接着層の耐久性について
Studies on the Wood Gluing(V) : Microscopic Observation on the Durability of Phenol- and Melamine-Resin Adhesive in Plywood-type Joint
後藤 輝男
篠原 悌三
作野 友康
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Beech and lauan plywood glued with phenol-resin adhesive or melamine-resin adhesive were exposed to boil and dry repeating cycle and to continuous boiling. Glue-joint durability of these plywoods was studied by means of the microscopic observation of glue-line and tension shear test.
The following conclusion may be drawn from the experiments.
1 ) Surface check and end check of plywoods occured from the boundary of compound ray. These caused the delamination of glue-line of plywood.
2 ) Delamination of glue-line occured from the end of compound ray and the latewood adjacent to the glue-line, and also from the lathe check of veneer.
3 ) The glue-joint strength of plywood glued with phenol-resin adhesive gradually decreased as the exposure to boil and bry repeating cyele proceeded. This phenomenon was caused mainly due to the deterioration of adherend.
4 ) The glue-joint strength of plywood glued with melamine-resin adhesive decreased rapidly toward twelve cycles, and then it was no longer observed. The deterioration of adhesive was chiefly responsible to this phenomenon.
The following conclusion may be drawn from the experiments.
1 ) Surface check and end check of plywoods occured from the boundary of compound ray. These caused the delamination of glue-line of plywood.
2 ) Delamination of glue-line occured from the end of compound ray and the latewood adjacent to the glue-line, and also from the lathe check of veneer.
3 ) The glue-joint strength of plywood glued with phenol-resin adhesive gradually decreased as the exposure to boil and bry repeating cyele proceeded. This phenomenon was caused mainly due to the deterioration of adherend.
4 ) The glue-joint strength of plywood glued with melamine-resin adhesive decreased rapidly toward twelve cycles, and then it was no longer observed. The deterioration of adhesive was chiefly responsible to this phenomenon.
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