[Utilization of compressed Chinese fir thinning wood].
With Chinese fir thinnings as raw material, and through measuring the physical-mechanical indices of its compressed wood, observing the variation of its microstructure and using IR analysis, an optimized technique of compressing Chinese fir thinnings was established. The technique was: compression ratio 50%-60%, thickness after compression 20 mm, moisture content before compression 50%, compressing time 20-30 minutes, and hot compressing temperature 180-200 degrees C. CH, an environmentally friendly cooking additive, had positive effects on softening the wood. During compressing, only the cells of fast-growing Chinese fir were extruded, their cavity became smaller, while the cell wall was not destroyed. The thickness reversion ratio of compressed wood was 2.68%, and its size stability and mechanical quality were as good as hardwoods (Betula lumninifera).
Chen
Ruiying
R
Fujian Agriculture and Forestry University, Fuzhou 350002, China. fcry56490@163.com
Wei
Ping
P
Liu
Jinghong
J
D032486:Cunninghamia / Q000254:growth & development*; D006244:Hardness; D011312:Pressure; D013314:Stress, Mechanical; D013718:Tensile Strength; D014867:Water / Q000737:chemistry; D014934:Wood / Q000737:chemistry
D014867:Water