Effect of Heat Treatment Temperature of Surface Plate on Physical and Mechanical Properties of Flatten-Bamboo-Poplar Veneer Composite Board

【Objective】The purpose of this paper is to give full play to the performance advantages of poplar and bamboo exhibition plate. 【Method】In this study, bamboo exhibition plate with different temperature heat treatment (120 ℃, 140 ℃, 160 ℃, 0 MPa for 2 h) was used as surface plate and poplar veneer as core board to make flatten-bamboo-poplar veneer composite board which was made up by assemble patterns of parallel texture. The properties of flatten-bamboo-poplar veneer composite board such as equilibrium moisture content, color difference, gloss, bonding strength, dipping peeling rate, bending strength, modulus of elasticity and so on were tested, and the effects of different temperature treatment of the surface plate on the physical and mechanical properties of the composite board were analyzed. 【Result】The results showed that, in terms of physical properties, with the increase of heat treatment temperature of the surface plate, the equilibrium moisture content of the composite board decreased significantly. The gloss of the composite board decreased gradually, and the color perception stability increased. The total color difference was greater than 1.5, but the color change was not obvious. In terms of gluing properties, the heat treatment of the surface plate reduced the bonding strength of the composite board, reaching the lowest value at 140 ℃. Immersion peeling test showed that the bonding durability of the composite board was first strengthened and then weakened with the increase of temperature. In terms of mechanical properties, the modulus of elasticity and bending strength increased with the increase of heat treatment temperature of the surface plate, and reached the maximum value at 140 ℃. 【Conclusion】The heat treatment of surface plate enriches the visual effect of the flatten-bamboo-poplar veneer composite board, improves the bending strength and modulus of elasticity of the composite board, but has a certain adverse effect on the bonding performance of the composite board. In actual use, it should be selected according to specific needs.