超声波预处理对杨木试件干燥特性的影响  

Effect of Ultrasonic Pretreatment on Drying Characteristics of Poplar

作　　者：邱墅 王振宇[1] 何正斌[1] 伊松林[1] 

机构地区：[1]木材科学与工程北京市重点实验室,北京林业大学,北京100083

出　　处：《东北林业大学学报》2016年第2期35-38,共4页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31270604)

摘　　要：以水为介质对杨木进行超声波预处理,探究不同的处理功率、频率和时间对杨木的干燥速率、水分扩散系数和尺寸稳定性的影响。结果表明:超声波预处理能大大提高杨木的干燥速率。当频率为28 k Hz,功率为300 W时,处理时间越长,干燥速率越快。在本实验条件下,超声波处理功率为40 k Hz时,干燥时间更长;超声波处理后的试材尺寸稳定性有所提高,超声波处理材的弦向和径向湿胀率都要低于未处理材;在相同的功率条件下,杨木试材的水分扩散系数都随着预处理时间的延长而增大,随着频率的增大而减小。The experiment of ultrasonic pretreatment for poplar was conducted,and the effect of treatment power,frequency and time on the drying rate,moisture diffusion coefficient and dimension stability of the wood was investigated in this study.The ultrasonic treatment could greatly improve the drying rate of poplar. When the frequency was 28 kH z,the power was300 W,the drying rate was increased with the increase of the treatment time. Under the condition of this experiment,the drying time was longer when the frequency is 40 kH z. The dimensional stability of the tested material after ultrasonic treatment was improved. The tangential and radial swelling rate of ultrasonic treatment material were lower than that of untreated wood. The moisture diffusion coefficient was increased with the increase of the treatment time,and decreased with the increase of the frequency at the same treated power.

关 键 词：超声波预处理 木材干燥 水分扩散系数 尺寸稳定性 

分 类 号：S781.71[农业科学—木材科学与技术]