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臭冷杉表面密实化及后期高温热处理工艺(PDF/HTML)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2015年03期
Page:
119-124
Column:
研究论文
publishdate:
2015-05-30

Article Info:/Info

Title:
Surface densification and high temperature hydrothermal post treatment of the Abies nephrolepis lumber
Article ID:
1000-2006(2015)03-0119-06
Author(s):
ZHAN Jianfeng12 CAO Jun2 GU Jiyou1 ZHANG Xinran1 CHEN Wei1 LIU Zhuojie1 LIU Bin1 MA Hengjian1
1.College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China;
2.Postdoc Research Station of Mechanical Engineering, Northeast Forestry University, Harbin 150040, China
Keywords:
Abies nephrolepis surface densification high-temperature hydrothermal treatment degree of compression compressive set recovery
Classification number :
S781
DOI:
10.3969/j.issn.1000-2006.2015.03.022
Document Code:
A
Abstract:
The objective of this article was to provide theoretical bases for the value-added processing technology of softwood plantation timbers, as well as to develop innovative wooden flooring materials. Abies nephrolepis sapwood lumbers with thickness of 35 mm was surface-densified to two degrees of compression at 160 ℃ and 180 ℃ by using a wooden composites heated press. The densified specimens were then hydrothermally post-treated at 180 ℃ and 200 ℃. To study the influence of the degree of compression, hot-pressing temperature and high-temperature hydrothermal post-treatment on the set-recovery of surface densified floorings, specimens were subjected to water soaking plus oven-drying cycles. The actual influential mechanisms of these factors over the recovery of surface compressive sets were discussed herein. Under these specified hot-pressing technique parameters, the actual densification areas of Abies nephrolepis sapwood lumbers lies two millimeters below wood surfaces and the densification plus reinforcement of flooring surfaces has been achieved accordingly. Being hydrothermally treated at 200 ℃ for one hour, the deformation recovery ratios of surface-densified specimens was just 28.6% of that of control specimens, highlighting that the hydrothermal post-treatment was a efficient technology, which could improve the deformation stability of surface-densified solid wood.

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Last Update: 2015-05-30