玉米秸秆刨花板压制工艺优化及吸水厚度膨胀率

Optimization of Corn Straw Particleboard Pressing Process and Expansion Rate of Water Absorption Thickness

农作物秸秆用作人造板原材料,可减少环境污染,缓解木材供需紧张,秸秆中纤维素与木质素含量可以满足人造板生产要求。以玉米秸秆刨花为原料,在一定热压压力、热压时间、刨花密度、热压温度下,采用不同施胶量无机胶黏剂压制玉米秸秆刨花板,探索最优工艺参数及玉米秸秆刨花板吸水厚度膨胀率变化规律。结果显示:压制玉米秸秆刨花板的最优工艺参数为刨花含水率12%、热压压力1.6MPa、热压时间9min、刨花密度1.0g/cm^(3)、施胶量20%、热压温度90℃;影响玉米秸秆刨花板吸水厚度膨胀率的因素依次为刨花含水率>热压压力>热压时间>刨花密度>施胶量>热压温度。试验结果表明:在吸水厚度膨胀率合格的前提下,玉米秸秆刨花板的内结合强度、弹性模量、静曲强度均符合国家标准规定的性能要求。

Crop straw can be used as raw material for wood-based panel,which can reduce environmental pollution and relieve tension between supply and demand for wood,the content of cellulose and lignin in straw can meet the requirements of wood-based panel production.Using corn stalk shaving as raw material,under certain hot pressing pressure,hot pressing time,particleboard density and hot pressing temperature,inorganic adhesives with different sizing amounts were added to press corn stalk particleboard in order to explore optimum process parameters and variation of expansion rate of water absorption thickness corn straw particleboard.The results showed that the optimum process parameters were 12%water content of shaving,1.6 MPa hot pressing,9 min hot pressing time,1.0 g/cm^(3) shaving density,20%sizing amount and 90℃hot pressing temperature.The factors affecting the expansion rate of water absorption thickness of corn stalk particleboard were successively water content of shaving>hot pressing>hot pressing time>particleboard density of shaving>sizing amount>hot pressing temperature.The results show that the internal bond strength,modulus of elasticity and modulus of rupture of the board meet the requirements of the national standard on the premise of the water-absorbing thickness expansion rate.