Effects of high-pressure (HP) treatment on densification of poplar sapwood boards and subsequent coatings were evaluated. Tung oil (TO) and epoxy resin (ER)-coated treatments were used to improve the dimensional stability of HP-densified wood. The density of the wood after HP densification increased from 450 ± 50 kg/m3 for the control to 960 ± 20 kg/m3 at 125 MPa. This process also resulted in the average thickness of HP-densified boards to reduce significantly from 29.7 ± 0.11 mm for the control to 18.8 ± 0.53 mm after HP densification at 25 MPa and 14.3 ± 0.10 mm after 125 MPa treatment for 30 s. The mechanical strength measured as the hardness of densified wood significantly increased from 35% at 25 MPa to 96% at 125 MPa treatment, compared to untreated wood. As expected both TO and ER-coated treatments significantly reduced set-recovery of densified wood when stored at four relative humidity environments. ER showed better anti-swelling performance than TO, and would be a better choice.

中文翻译：

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高压致密化和疏水性涂层，可增强杨木软木板的机械性能和尺寸稳定性

评估了高压（HP）处理对杨木边材板和随后的涂层致密化的影响。桐油（TO）和环氧树脂（ER）涂层处理用于改善HP致密木材的尺寸稳定性。HP致密化后的木材密度从对照组的450±50 kg / m3增加到125 MPa时的960±20 kg / m3。此过程还导致HP致密板的平均厚度从对照组的29.7±0.11 mm显着降低到25 MPa的HP致密化后的18.8±0.53 mm和125 MPa的30 s处理后的14.3±0.10 mm。与未处理的木材相比，以致密木材的硬度衡量的机械强度从25 MPa时的35％显着提高到125 MPa处理时的96％。正如预期的那样，当在四个相对湿度的环境下存放时，TO和ER涂层处理均显着降低了致密木材的凝固回复率。ER显示出比TO更好的抗溶胀性能，将是一个更好的选择。