Abstract:

Because bamboo absorbs water slowly,the softening time of bamboo blocks by this routine softening method lasts long.In order to improve bamboo softening effect and effeciecy quickly,softening treatment technology at high temperature was adopted.Effect of softening treatment of bamboo at 120 ℃ for 30 min was studied in this paper.The results of modulus of elasticity(MOE)of bamboo showed that the MOE of bamboo strip after softening treatment for 30 min at 120 ℃ was decreased from 8 912 Mpa to 6 417 Mpa which meant that plasticity of bamboo was increased greatly.The results of dynamic mechanical analysis(DMA)showed that glass transition temperature(T_g)of no softening treatment bamboo was 120 ℃,while T_g of softening treatment bamboo at 120 ℃ for 30 min was 88 ℃,T_g of softening treatment bamboo at 120 ℃ for 30 min decreased 26.7% compared with that of no softening treatment bamboo.The results of hardness showed that the hardness of surface near outer part of bamboo and surface near inner part of bamboo after softening treatment for 30 min at 120 ℃ was decreased with 42.0% and 54.6% respectivly compared with no softening treatment bamboo.The results of thickness deviation and lathe check on the loose side of veneer showed that surface quantity of bamboo veneer can be guaranteed after softened at 120 ℃ for 30 min.

Key words: softening treatment, bamboo, veneer, hardness, dynamic mechanical analysis(DMA)