Effects of Veneer Back Cracking Rates of Eucalypt Woods on Performances of Plywoods
In order to provide theoretical basis for optimization of lay-up process in production of plywoods, ef-fects of veneer back cracking rates of eucalypt woods on performances of plywoods were analyzed by using im-age processing technology in combination with macro-mechanical performance test. Correlations among veneer back cracking rate of eucalypt woods and performances of plywoods were discussed. Results showed that among different veneer back cracking rates, there were extremely significant differences in bond strength of dry state, bond strength of soaking in cold water for 24 h, bond strength of soaking in hot water for 3 h and modulus of rupture parallel to grain of plywoods and there were no differences in transverse modulus of rupture, transverse modulus of elasticity, and modulus of elasticity parallel to grain. With increase of veneer back cracking rates, bond strengths of three conditions, modulus of rupture parallel to grain and modulus of elasticity parallel to grain showed trends of decrease. Correlation analysis showed that veneer back cracking rates had extremely sig-nificantly negtive correlations with bond strength of dry state, bond strength of soaking in cold water for 24 h and modulus of rupture parallel to grain of plywoods, and had significantly negative correlation with modulus of elasticity parallel to grain. Effects of veneer back cracking rate on performances of plywoods were bond strength of soaking in cold water for 24 h>bond strength of dry state>modulus of rupture parallel to grain>modulus of elasticity parallel to grain>bond strength of soaking in hot water for 3 h>transverse modulus of elasticity>trans-verse modulus of rupture.
veneer back cracking rateperformanceeucalypt woodplywood
万方数据
维普
