摘要:A composite board made from flattened bamboo as face layer and pine lumber as core layer with PF resin adhesive was developed.The properties of the board which was manufactured under different pressures,same temperature,same hot pressing time and same adhesive spreading were studied,resulting in proper hot pressing conditions.The results of the experiment indicated that physical and mechanical properties of the board were able to reach LY 1055-91 standard requirement.The board proved to be a kind of acceptable products which can make better use of resources of bamboo and Masson pine ( Pinus massoniana ) reasonably,comprehensively and economically.
摘要:The effect of both treatment temperature and time on CCA fixation in wood was experimentally investigated in order to improve the fixation in CCA treated wood.The results showed that the CCA fixation rate in wood increased rapidly with a rise of temperature.It took 300 hours for 92%~94% fixation rate at ambient temperature(15~17℃)and 21~45 hours for 95%~98% at 70℃.Furthermore,it took only 9~12 horus for a complete CCA fixation by hot wet air heating process (70℃, RH 80%~83%) This process could be operated easily and can be used to reduce environmental pollution from CCA treated wood and improve the production efficiency.
关键词:CCA preservatives;Fixation rate;Hot wet air heating
摘要:This paper presented a constant line speed digital system specially designed for veneer peeling rotary lathes. The system was characterized with its a synchronous motor which could change lathe speed by frequency modulation, resulting in easy operation and energy saving.
关键词:microcontroller;Frequency modulation;Constant line speed;PID veneer peeling rotary lathe control