制造工艺因素对刨花板吸水厚度膨胀率的影响

THE EFFECTS OF ALL MAIN MANUFACTURING FACTORS ON THE THICKNESS SWELLING IN PARTICLEBOARD

结合众多实验结果 ,讨论了刨花板制造工艺中 1 2个主要因素———热压温度、热压时间、热压压力、板的密度、刨花含水率、施胶量、施蜡量、胶粘剂种类、刨花形态、刨花原料种类、刨花预处理、成板的二次压制处理对刨花板吸水厚度膨胀率的影响。结果表明 ,降低刨花板的 2 4h吸水厚度膨胀率要通过降低其不可逆厚度膨胀率获得 ,而降低不可逆厚度膨胀率的实质是尽量以非膨胀功耗能释放内应力 ,减少粘弹性变形和胶接点破坏。研究还表明 ,上述 1 2个制板要素中 ,除施蜡量外 ,都对不可逆厚度膨胀率有很大的影响 ,因此选择合理的制板工艺因素对刨花板的尺寸稳定性很重要。

Based on many results from experiments,the paper discussed the effects of 12 main factors of manufacturing particleboard on the thickness swelling and irreversible thickness swelling,which are hot\|pressing temperature,hot\|pressing time,hot\|pressing pressure,density,moisture content of particles,resin consumption,wax consumption,adhesive species,particle geometry,particle species,particle pre\|treatment and double pressing for particleboard.It showed that the reduction of 24?h TS of particleboard is by way of reducing its ir TS .And the essence of reducing ir TS is to release the internal stress by mains of discharging Non\|expansion\|work energy,to lessen the quantity of visco\|elastic deformation and to decrease the destuction of bonding points.It aslo showed that all main factors except wax consumption have great effects on ir TS of particleboard,as a result,it is very important to choose the right conditions for manufacturing the particleboard with good demension stability.