论文部分内容阅读
伊朗的复合板工业面临着木材短缺的危机,不得不利用森林作业及木材工业中产生的剩余物来生产复合板,从而与造纸工业形成竞争.本研究探讨使用杨树人工林的剩余物生产刨花板.在刨花板生产试验中,对3种木材材料--杨树树枝、杨树小径材和山毛榉材进行了实验研究.研究结果表明:用杨树枝和杨树小径材生产的刨花板的特性可与用成熟山毛榉材制成刨花板板相媲美.尽管使用2％硬化剂制成的板材的性能要比低量硬化剂(1％或1.5％)制成的板材性能高,但为了避免板材中含有过多残留的酸,使用1.5％的硬化剂在175℃热压下生产的板材的特性可以被接受.由树枝加工成的刨花板板的静曲强度、弹性模量和内结合力分别为14.57MPa、2015MPa和1.32MPa.,而由小直径杨木制成的刨花板相应数值为19.90MPa、2199MPa和1.86MPa.由树枝制成的板材水中浸泡2小时和24小时后厚度膨胀率分别为20.14％和31.26％.利用杨树树枝和小直径木材生产刨花板是伊朗刨花板工业的生存和发展之道.“,”The composite board industry in Iran is obliged to use resi-dues from forest operation as well as wood industry for competing with paper industry because of shortage of wood. In the present study we investigated the residues from poplar plantation used for particleboard production. Three kinds of wood materials, poplar branches, small diameter poplar wood (3-8 cm) and beech wood, were used in the ex-periment of particleboard production. The results demonstrated that the characteristic of particleboard made from poplar branches and small diameter wood is comparable to that made from mature beech wood. To avoid too much residual acid in the final board, the properties of boards produced with 1.5% hardener at 175oC press temperature are acceptable, although the properties of particleboard produced with 2% hardener were higher than were higher than that of the board produced with lower hard-ener (1% or 1.5%).. The MOR, MOE and IB of particleboard made from branches were measured as 14.57, 2015, and 1.32 MPa, respectively, while The MOR, MOE and IB of particleboard produced from small diameter poplar wood were 19.90, 2199, and 1.86 MPa, respectively. The thickness swelling of boards made from branches after 2 and 24 h im-mersion in water was 20.14% and 31.26%. The utilization of branches and very small diameter wood of poplar is recommended for the survival and developments of particleboard industry in Iran.