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Influence of cooling rate on the physical properties, chemical composition, and mechanical properties of heat-treated rubberwood
Holzforschung ( IF 2.4 ) Pub Date : 2020-11-26 , DOI: 10.1515/hf-2019-0232
Chuanfu Chen 1 , Dengyun Tu 1 , Xiangyu Zhao 1 , Qiaofang Zhou 1 , Banyat Cherdchim 2 , Chuanshuang Hu 1
Affiliation  

Abstract This study aimed to reduce the loss of mechanical strength in heat-treated rubberwood by rapid cooling. Heat-treated rubberwood specimens were prepared by controlling their cooling rate during the cooling phase of the heat treatment. The effects of cooling rate on the physical properties, chemical composition, and mechanical properties of heat-treated rubberwood were evaluated. Results indicated that cooling rate significantly influenced mass loss (ML). ML in heat-treated rubberwood cooled at 6 °C min−1 decreased by 23% relative to that in heat-treated rubberwood subjected to natural cooling. Compared with the heat-treated rubberwood subjected to natural cooling, the heat-treated rubberwood that was cooled at 4.5 °C min−1 increased in modulus of rupture (MOR), surface hardness, and screw withdrawal strength (tangential section) by 26, 8, and 16%, respectively. The cool rates exerted less effects on the dimensional stability, surface color, modulus of elasticity (MOE), compressive strength parallel to grain (CS), and screw withdrawal strength (radial section) of the heat-treated rubberwood. The application of rapid cooling to wood heat treatment could efficiently shortened the heat treatment period, thus increasing productivity.

中文翻译:

冷却速度对热处理橡胶木物理性能、化学成分和力学性能的影响

摘要 本研究旨在通过快速冷却减少热处理橡胶木的机械强度损失。通过在热处理的冷却阶段控制它们的冷却速率来制备经过热处理的橡胶木试样。评估了冷却速率对热处理橡胶木的物理性能、化学成分和机械性能的影响。结果表明冷却速率显着影响质量损失(ML)。相对于经过自然冷却的热处理橡胶木,在 6 °C min-1 下冷却的热处理橡胶木中的 ML 降低了 23%。与经过自然冷却的热处理橡胶木相比,在 4.5 °C min-1 下冷却的热处理橡胶木的断裂模量 (MOR)、表面硬度和螺钉拔出强度(切向截面)增加了 26, 8、和 16%,分别为。冷却速率对热处理橡胶木的尺寸稳定性、表面颜色、弹性模量 (MOE)、平行于纹理的压缩强度 (CS) 和螺钉拔出强度(径向截面)的影响较小。将快速冷却应用于木材热处理可以有效缩短热处理周期,从而提高生产率。
更新日期:2020-11-26
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