摘要
对从10.9%吸湿到25%再吸水到33%,接着蒸发回到25%再解吸回到10.9%的一个循环内多点含水率(MC)下的意杨酚醛树脂单板层积材(P-PF-LVL)静曲弹性模量(MOE)的测试分析结果表明:仅一个周期(MC 10.9%～33%～10.9%)的增水和失水,就导致P-PF-LVL产生了31.36%初始MOE的永久性损失,其中,源自于热压压缩永久性厚度回复的有4.61%;初始MOE最大可下降56.66%,初始厚度最大可增加4.84%,其中,热压压缩的永久性厚度回复有2.76%。P-PF-LVL的纤维饱和点为25%左右,其特征与一般实木有所不同。研究结果有助于结构用LVL的设计、制造和性能控制。
Results from the test and analysis of the bending modulus of elasticity （MOE） at several levels of moisture content （MC） of the PF-bonded laminated poplar veneer lumber （P-PF-LVL） show that after only one cycle of increasing and decreasing of MC （10.9%-33%-10.9%）, 31.36% of the initial MOE of the PF-bonded poplar laminated veneer lumber （P-PF-LVL） loses permanently, in which 4.61% is from the permanent thick- ness recovery of the compression caused by hot pressing. The maximum loss of MOE can be 56.66% of the initial one. The maximum thickness swelling can be 4.84% of the initial thickness, in which 2.76% is from the perma- nent recovery of the compressed thickness. It is also found that the fiber saturation point of the P-PF-LVL is about 25% and its characteristics are quite different from those of common solid wood. All these achievements may be valuable for design, manufactory and quality control of the structural LVL.
出处
《林产工业》
北大核心
2013年第3期14-18,共5页
China Forest Products Industry
基金
国家自然科学基金31170534资助
关键词
意杨PF—LVL
静曲弹性模量
含水率
湿胀干缩
压缩回复
Poplar PF-LVL
Bending modulus of elasticity
Moisture content
Swelling and shrinkage
Recov- ery of compression
作者简介
孙伟，硕士研究生，西南林业大学材料工程学院
张宏健（通讯作者），E—mail：hjzhang008@yahoo．com．cn
