The utilization of unilateral surface compression technique offers significant advantages such as reduced volume loss of wood and energy consumption, making it highly promising for widespread applications. This work focused on fast-growing poplar (Ctrl) as research subject. The unilateral surface compression technique was employed to prepare compressed wood (USW), while superheated steam was utilized to suppress rebound effects (resulting in the formation of US＆HW). The results showed that the combination of densification and heat treatment technology significantly enhanced the application performance of wood. Compared to Ctrl, the densified area exhibited a significant reduction in the volume of cell cavities, with a stepped distribution evident on the VDP. Furthermore, heat treatment resulted in a decrease in the relative amount of hydroxyl in the wood, as well as a slight increase in crystallinity. This effectively reduced deformation in dense wood, resulting in a 20.02% reduction in its recovery rate, without causing excessive damage to the VDP. Additionally, Heat treatment resulted in a darker wood color, reduced glossiness, increased roughness, and further increase the water contact angle of the compressed wood. The mechanical performance of US＆HW achieved an excellent grade, with a score of 48, while all six processing performance grades of US＆HW exceeded Grade 3, surpassing those of both USW and Ctrl. The finishing performance of the US＆HW was good, although slightly lower than that of USW in terms of ball impact performance. And the adhesion, hardness and abrasion resistance indexes of the paint film meet the requirements of excellent products in the standard.

中文翻译：

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单侧表面压缩技术及热处理对杨木工业应用性能的影响

单边表面压缩技术的利用具有显着的优点，例如减少木材的体积损失和能源消耗，使其具有广泛应用的前景。本工作以速生杨树（Ctrl）为研究对象。采用单边表面压缩技术制备压缩木材（USW），同时利用过热蒸汽抑制回弹效应（导致US＆HW的形成）。结果表明，致密化与热处理技术的结合显着增强了木材的应用性能。与 Ctrl 相比，致密区域的细胞腔体积显着减少，VDP 上呈明显的阶梯分布。此外，热处理导致木材中羟基的相对量减少，结晶度略有增加。这有效减少了致密木材的变形，导致其恢复率降低了20.02%，同时又不会对VDP造成过度损坏。此外，热处理导致木材颜色变深、光泽度降低、粗糙度增加，并进一步增加压缩木材的水接触角。US＆HW的机械性能取得了优异的成绩，得分为48分，而US＆HW的6个加工性能等级全部超过3级，超过了USW和Ctrl。US＆HW的终结表现良好，但在击球性能方面略低于USW。漆膜的附着力、硬度、耐磨性指标均达到标准中优等品的要求。