Study On Centrifugal Pre-dweatering Technology Of Preservative Treated Wood

For the characteristic of preservative treated wood with high moisture content, in this paper, explores the possibility of using centrifugal pre-dewatering to replace the traditional thermal drying.Select several species of fast-growing trees which commonly used, such as poplar, radiata pine, and pinus sylvestris Mongolian pine for centrifugal pre-dewatering test. Explore the influence of different speed, temperature, dehydration time on preservative treated of pinus sylvestris Mongolian pine, Research the centrifugal dewatering effect and the differences among the sapwood and heartwood of radiata pine and poplar, analyzed the relationship between the centrifuge dewatering effects and the permeability of the test specimen.The results showed that, under the laboratory conditions, when the centrifuge speed is 700-900r/min, in 5-10min, the average moisture content of the poplar can be down to 83% from 130% and the radiata pine sapwood can be down to 100% from 210%, the radiata pine heartwood can be down to 125% from 170%. The centrifuge dewatering effect has no significant difference between the sapwood and heartwood of poplar, while the effect on the sapwood of radiata pine is 2 times than the heartwood. At a certain time and temperature range, the effect of the temperature and centrifuge time is not significant.According to the result of orthogonal test, the process of centrifugal pre-dewatering for wood which has high moisture content was presented in this paper Using small test specimen of poplar, and through the thermal calculated and analysis, it is found that the energy consumption at this stage is only 1/100 of the conventional thermal drying method. So the energy-saving effect is very significant, and it is necessary to make further research.