连续平压法生产低密度纤维板的工艺研究

摘要

The low density of fibreboard( LDF) was prepared through continuous hot-press method, and the effects of density and hot-pressing temperature of second pressurized area on main performances of LDF was discussed.Meanwhile, the effects of 4 factors of density, hot-pressing pressure of second pressurized area, glue consumption, steel belt running speed on main performances of LDF was analyzed by orthogonal design.The results showed that the sequencing of 4 factors affecting IB and MOR of LDF was densi-ty, hot-pressing pressure of second pressurized area, glue consumption, hot-pressing time, and there was significant effect of den-sity on main performances of LDF.It was feasible that LDF with the density of 563.56 kg· m-3 was manufactured under the techno-logical conditions as follows:hot-pressing pressure of two pressurized area of 0.4 MPa, glue consumption of 16%, hot-pressing time of 10.5 s· mm-1 , hot-pressing temperature of 190 ℃ at second pressurized area, Art combination used the continuous pressing method to produced 18 mm thick low density of fiberboard with the density of 563.56 kg· m-3, internal bond strength of 0.46 MPa, static music intensity was 24.5 MPa, modulus of elasticity was 2356 MPa, bibulous ply expands rate was 10.8%, which reached the ordinary medium density of fiberboard performance requirements in dry condition in GB/T 11718-11718.%在连续平压法生产线上进行制备低密度纤维板试验，分别探讨板材密度、二次加压区热压温度对板材主要力学性能的影响，并通过正交试验分析板材密度、二次加压区热压压力、施胶量、钢带运行速度4个因素对低密度纤维板主要性能的影响，结果表明：各因素对板的内结合强度与静曲强度影响大小顺序为：板材密度、二次加压区热压压力、施胶量、热压时间；其中，密度对板材性能的影响极显著。采用二次加压区热压压力0.4 MPa，施胶量16％，热压时间10.5 s· mm-1，二次加压区热压温度190℃的工艺组合采用连续平压法生产厚度18 mm的低密度纤维板，密度为563.56 kg· m-3、内结合强度为0.46 MPa、静曲强度为24.5 MPa、弹性模量为2356 MPa、吸水厚度膨胀率为10.8％，达到GB/T 11718-2009中干燥状态下使用的普通型中密度纤维板性能要求。