微波和过热蒸汽处理后辐射松木材的吸水率:边材与心材

IF 2.4 3区 农林科学 Q1 FORESTRY
Huimin Cao, Saisai Huang, Fangyu Yin, Yufa Gao, Xiaomei Liao, Songlin Yi, Yongdong Zhou
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引用次数: 0

摘要

松木中的树脂通道和射线细胞连接着内部和外部。树脂对树脂通道和射线细胞的阻塞直接决定了木材的吸水性。然而,有关树脂木材吸水性的研究还很缺乏。因此,本研究旨在从树脂含量(RC)的角度解释微波(MW)或过热蒸汽(SS)处理如何提高木材的吸水性。因此,用 MW、SS 或微波-过热蒸汽(MS)对辐射松边材和心材进行了不同时间的处理。结果表明,MW 和 SS 处理可驱除辐射松的内部树脂。由于边材的 RC 低且含水率(MC)高,MW 处理对辐射松边材 RC 的影响并不显著。与边材相比,心材的 RC 明显更高,MC 更低;因此,MW 处理可促使部分树脂从木材中迁移出来。随着 SS 处理时间的延长,边材和心材的 RC 都有不同程度的下降,但芯层树脂并不能完全去除。此外,MW 处理能加速脱脂过程,因为它能排出部分树脂并打开部分树脂通道。此外,MS 处理会因树脂的排出而增加边材和心材的孔隙率。MS 处理对边材的吸水率没有明显影响,但却使心材的吸水率增加了三倍多。染料溶液通过开放的树脂通道或射线细胞进入木材,并与轴向树脂通道相通。因此,心材的吸水率主要与树脂含量有关,树脂对树脂通道的堵塞决定了染料溶液进入木材内部的情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Water uptake of radiata pine wood after microwave and superheated steam treatments: sapwood vs. heartwood

Water uptake of radiata pine wood after microwave and superheated steam treatments: sapwood vs. heartwood

Resin canals and ray cells in pine wood connect the interior to the exterior. The blockage of resin canals and ray cells by the resin, directly determines the water uptake of the wood. However, research on water uptake by resinous wood is lacking. Hence, this study aimed to explain how microwave (MW) or superheated steam (SS) treatment improves wood water uptake from the perspective of resin content (RC). Therefore, radiata pine sapwood and heartwood were treated with MW, SS, or microwave-superheated steam (MS) for different times. The results showed that MW and SS treatments expelled the internal resin of radiata pine. Owing to the low RC and high moisture content (MC) of sapwood, the effect of the MW treatment on the RC of radiata sapwood was insignificant. Heartwood has a markedly higher RC and lower MC than sapwood; therefore, MW treatment can drive part of the resin to migrate out of the wood. With increasing SS treatment time, the RC of the sapwood and heartwood decreased to varying degrees; however, the core layer resin could not be completely removed. In addition, MW treatment can accelerate the degreasing process as it discharges some part of the resin and opens some parts of the resin canals. Moreover, MS treatment can increase the porosity of sapwood and heartwood due to the expulsion of resin. MS treatment had no significant effect on sapwood water uptake; however, it increased that of heartwood by more than three times. The dye solution enters the wood through the open resin canals or ray cells and communicates with the axial resin canals. Therefore, the water uptake of heartwood is mainly related to the resin content and the blockage of the resin canals by the resin determines the entry of the dye solution to the interior of the wood.

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来源期刊
European Journal of Wood and Wood Products
European Journal of Wood and Wood Products 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
3.80%
发文量
124
审稿时长
6.0 months
期刊介绍: European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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