Effect of Pre-Freezing Treatment on Drying Characteristics of Waterlogged Wood from Chinese Cruiser Zhiyuan

GAO Xin; CAO Huimin; GUO Juan; ZHOU Fan; YIN Yafang; ZHOU Yongdong

doi:10.12326/j.2096-9694.2024055

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Effect of Pre-Freezing Treatment on Drying Characteristics of Waterlogged Wood from Chinese Cruiser Zhiyuan
Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 38, Issue 6, Pages: 8-14(2024)
Published： 30 November 2024 ，
DOI： 10.12326/j.2096-9694.2024055
稿件说明：

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GAO XIN, CAO HUIMIN, GUO JUAN, et al. Effect of Pre-Freezing Treatment on Drying Characteristics of Waterlogged Wood from Chinese Cruiser Zhiyuan. [J]. Chinese journal of wood science and technology, 2024, 38(6): 8-14.
DOI：

GAO XIN, CAO HUIMIN, GUO JUAN, et al. Effect of Pre-Freezing Treatment on Drying Characteristics of Waterlogged Wood from Chinese Cruiser Zhiyuan. [J]. Chinese journal of wood science and technology, 2024, 38(6): 8-14. DOI： 10.12326/j.2096-9694.2024055.

摘要

以打捞出水的致远舰散板木材为研究对象，分析木材树种、出水含水率、基本密度等信息，确定出水木材为轻度腐朽的柚木（

Tectona grandis

）和重度腐朽的榕树（

Ficus

sp.）试样。采用－20℃和－79℃两种温度对出水试样进行预冻48 h处理，分析其对试样干燥速率和干缩率的影响。结果表明：预冻处理可以显著降低试样干缩率，但对干燥速率影响不显著。两种冷冻温度处理效果差异较小，从节能考虑采用－20℃进行冷冻处理即可达到效果。对于重度腐朽的榕树样品预冻处理虽然可以一定程度减少干缩率，但是由于样品强度较差，预冻处理后试样干缩率仍较大，因此本研究所采用的预冻处理工艺并不适用于重度腐朽样品，后续可以考虑对预冻处理工艺进行优化改进。

Abstract

This paper presents the investigation on the waterlogged wood from Chinese Cruiser Zhiyuan. The information of wood species

moisture content

and basic density were analyzed. The species and degradation degree of the waterlogged wood were classified as mildly decayed teak and severely decayed banyan. The samples of waterlogged wood were pre-frozen at －20℃ and －79℃ for 48 hoours. The drying speed and the shrinkage rate of the samples were measured and analyzed. The results showed that pre-freezing treatment significantly reduced the shrinkage rate but had no significant effect on the drying rate. The impacts of two freezing temperatures were minimal

therefore the treatment result could be achieved by using －20℃ freezing treatment for energy saving. Although the deformation of the severely decayed banyan samples reduced during drying after pre-freezing treatment

the final deformation rate was considerably large due to the poor strength of samples. The pre-freezing process was not suitable for severely decayed samples. An optimized treatment process need to be further studied.

关键词

出水木材预冻处理干燥致远舰

Keywords

waterlogged woodpre-freezing treatmentdryingChinese Cruiser Zhiyuan

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