Effect of Veneer Surface Roughness and Compressibility on Plywood/LVL Performance
Previously, a revised wood transverse compression theory was proposed to include the first stage of progressive contact and define the minimum compression required for achieving adequate interfacial contact for bonding and true yield displacement. A new method was also developed to evaluate veneer surface roughness in terms of its compression behaviour. Due to the variation of veneer surface roughness, compressibility and random veneer placement in the plywood/LVL panel assemblies, this study was aimed to investigate the effect of veneer surface roughness and compressibility on panel performance. The surface roughness of rotary cut trembling aspen (Populus tremuloides) veneer was first characterized with a stylus profilometer. Then, through the compression tests of small aspen veneer specimens, the correlation between contact area (indicated by glue coverage) and panel compression ratio (CR) was established. Based on the distribution of the minimum compression required and yield displacement of aspen veneer, an optimum range of aspen panel densification was identified with a CR ranging from 11.3 to 18.0％. Through manufacturing of parallel-ply aspen veneer panels and 5-ply aspen plywood panels, such densification range identified was validated for improved panel gluebond quality, material recovery and dimensional stability while achieving superior panel bending performance.
Compressibility compression ratio contact area density dimensional stability gluebond laminated veneer lumber (LVL) material recovery performance plywood surface roughness trembling aspen veneer
Brad Jianhe Wang Chunping Dai Simon Ellis
Composites Group, FPInnovations-Forintek, 2665 East Mall, Vancouver, BC Department of Wood Science, University of British Columbia, Vancouver, BC
国际会议
The Third International Symposium on Veneer Processing and Products(第三届国际胶合板制造技术研讨会)
上海
英文
239-252
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）