蒸汽热处理对桉木物理力学性能的影响

Effect of Steam Heat Treatment on Physical and Mechanical Properties of Eucalyptus

为研究桉木制备实木地板的可行性,以桉木为研究对象,采用水蒸汽为加热介质,分别在150℃、170℃、190℃、200℃、210℃下热处理1.5 h、3 h、4.5 h、6 h,分析蒸汽热处理温度和时间对木材的干缩率、湿胀率和抗弯性能的影响。试验结果表明:与素材相比,蒸汽热处理后木材干缩率、湿胀率均不同幅度下降,降幅分别在0.7%~54.6%、1.1%~60.1%区间,尺寸稳定性得到明显改善;同时,热处理材的抗弯强度不同幅度下降,降幅在3.2%~59.4%之间,抗弯弹性模量有不同幅提高,增幅在7.0%~52.7%之间。

In order to study the feasibility of preparing solid wood flooring from fast-growing eucalyptus wood, this experiment took Eucalyptus wood as the research object and heat treated with steam at 150 ℃, 170 ℃,190 ℃, 200 ℃ and 210 ℃ for 1.5 h, 3 h, 4.5 h and 6 h, respectively. The effects of steam heat treatment temperature and time on dry shrinkage, wet expansion and bending resistance of wood were analyzed. Compared with the untreated wood, the experimental results showed that the dry shrinkage and wet swelling of wood after steam heat treatment were decreased by different ranges, which were in the range of 0.7%-54.6% and 1.1%~60.1%,respectively, and the dimensional stability was improved. At the same time, the bending strength of heat-treated materials decreased by 3.2%-59.4% and the bending elastic modulus increased by 7.0%-52.7%.