Sandwich Compression Formation and Density Distribution in Chinese Fir (<italic style="font-style: italic">Cunninghamia lanceolata</italic>) Wood

LI Xiaoling; HUANG Rongfeng; HE Xiaoyu; WANG Yanwei; SUN Longxiang; LU Yun; LI Jing; FENG Shanghuan

doi:10.12326/j.2096-9694.2023198

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Sandwich Compression Formation and Density Distribution in Chinese Fir (Cunninghamia lanceolata) Wood
1.Research Institute of Wood Industry，Chinese Academy of Forestry；Key Lab of Wood Science and Technology of National Forestry and Grassland Administration，Beijing 100091，China
2.Treessun Flooring Co.，Ltd，Nanxun 313009，Zhejiang，China
3.Key Laboratory of National Forestry and Grassland Administration；Beijing for Bamboo & Rattan Science and Technology， International Center for Bamboo and Rattan，Beijing 100102，China
Vol. 38, Issue 3, Pages: 11-20(2024)
DOI： 10.12326/j.2096-9694.2023198
稿件说明：

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李晓玲,黄荣凤,何啸宇等.杉木层状压缩的形成及其密度分布特征[J].木材科学与技术,2024,38(03):11-20. DOI： 10.12326/j.2096-9694.2023198.

LI Xiaoling,HUANG Rongfeng,HE Xiaoyu,et al.Sandwich Compression Formation and Density Distribution in Chinese Fir (Cunninghamia lanceolata) Wood[J].Chinese Journal of Wood Science and Technology,2024,38(03):11-20. DOI： 10.12326/j.2096-9694.2023198.

摘要

实木层状压缩技术是以实体木材的定向定位压缩为目标，以最小的材积损耗，最大限度地提高木材力学性能的一种新型木材压缩方法。通过水热分布调控以及外力加载的协同作用，在调控压缩层的形成位置、厚度和多层压缩的基础上，分析压缩木材密度分布特征，研究层状压缩技术对于人工林杉木（

Cunninghamia lanceolata

）的适用性及其层状压缩形成的特点。结果表明：预热时间控制在0.5~30 min之间时，获得压缩层位置不同的层状压缩杉木。随着预热时间的增加，压缩层由表层逐渐向中心（厚度方向）移动，压缩层密度达到0.583 g/cm

及以上；通过调控压缩量，获得压缩层厚度为3.00~8.07 mm的4种厚度的表层压缩杉木，压缩层密度提高率比木材整体密度提高率平均高28.7%；将表层压缩和中心层压缩工艺并用，实现形成3个压缩层的多层压缩。扫描电镜观察结果表明，无论压缩层形成于表层还是中心层，压缩层与未压缩层界线出现在早材区域或早晚材交界处，压缩层的早材细胞发生细胞壁屈曲变形，至细胞腔几乎完全消失，而晚材细胞壁及细胞腔仅发生微变形或不变形。依据压缩前后木材密度分布曲线及特征值计算结果，杉木压缩层部位的早材密度提高率最大值可以达到210.6%。

Abstract

Wood sandwich compression is an advanced technology of compressing wood layers through controlling the position

thickness

and the number of the compressed layers to achieve mechanical property enhancement. By regulating the distribution of temperature and moisture in Chinese fir wood under the desired pressure

the positions and thickness of compressed layers were managed in this study. Furthermore

density distribution in the compressed Chinese fir wood was analyzed to investigate the feasibility of sandwich compression technology to plantation Chinese fir wood and to clearly understand the formation mechanism. The results indicated that when the preheating time ranged from 0.5 to 30 minutes

Chinese fir wood was sandwich compressed with various positions of compressed layers. As the preheating time extended

compressed layers moved from wood surfaces into center and the compressed layer's density exceeded 0.583 g/cm³. By changing the compressing rate and thickness of wood specimen

four types of surface compressed wood with a compression layer thicknesses' range between 3.00~8.07 mm were obtained. The average density of the compressed layer was 28.7% higher than that of the original wood. Combining the technologies for surface compression and centre compression

three distinct compressed layers were formed in the sandwich compressed wood. It was also found that the boundary between the compressed layers and uncompressed layers appeared in the earlywood and the boundary between earlywood and latewood

regardless that compression occurred on wood surface or inside wood. Remarkably

the earlywood cells in the compressed layer underwent significant distortion

leading to the disappearance of almost all cell cavities. On the other hand

latewood cells exhibited little deformation or even remained intact. Based on the density profiles and the calculated characteristic values before and after compression

the maximum density of the compressed earlywood was 210.6% higher than that of the corresponding uncompressed earlywood.

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Temperature Distribution in Wood with Uneven Moisture Distribution during Preheating Process by Press Platens

Density Distribution of Reconstituted Birch Lumber with Different Hot Pressing Processes

Sandwich Compression Formation and Density Distribution in Chinese Fir (Cunninghamia lanceolata) Wood

DOI： 10.12326/j.2096-9694.2023198

摘要

Abstract

关键词

Keywords

references