Development and investigation on physical and mechanical properties of mahogany sawdust particleboards made with tannic powder of Indian tamarind (Pithecellobium Dulce Benth)
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The recycling of forest residues was investigated in the present study. It arms to determine the physical and mechanical properties of particleboards from mahogany sawdust bonded by pearls bone glue or tannic powder of peel of Indian tamarind (Pithecellobium Dulce). The influence of the size of particles on the physical and mechanical properties of the particleboards is studied. Five different granulometries (raw sawdust; 2.5 < g £ 5; 1.6 < g £ 2.5 and 0.8 < g £ 1.6, and g £ 0.8) were investigated. The rate of the adhesives used were 5; 6.5; 7; 7.5; 8; 10, 12.5 and 15 percent. Physically, the density, thickness swelling (TS) and water absorption (WA) were evaluated. Mechanically, the modulus of elasticity (MOE), the modulus of rupture (MOR), the modulus of Young E, the tensile modulus of rupture (MOT) and the internal bond (IB) were determined. The results obtained showed that the granulometry has a great influence on the physical as well as the mechanical properties of the Mahogany sawdust particleboards. The pressing temperature is 160 °C. The threshold fixed by the American standard ANSI A208.1-2016 for the MOE and the MOR are widely reached. The values of the density classified the particleboards from sawdust of Mahogany wood in the categories of low and mean density. The thickness swelling and water absorption has not respectful to the American standard ANSI A208.1–2016 [1]. So, the manufactured boards can only be used in dry conditions.
本研究围绕森林残留物回收利用展开探究，旨在确定以珍珠骨胶或印度罗望子（Pithecellobium Dulce）果皮单宁粉作为胶黏剂，由桃花心木锯屑制备的刨花板的物理与力学性能。本研究同时考察了颗粒粒径对刨花板物理及力学性能的影响，共设置5种不同粒径级配：原生锯屑、2.5<g≤5、1.6<g≤2.5、0.8<g≤1.6以及g≤0.8。胶黏剂添加量分别为5%、6.5%、7%、7.5%、8%、10%、12.5%及15%。物理性能测试环节，测定了密度、厚度膨胀率（thickness swelling, TS）与吸水率（water absorption, WA）；力学性能测试环节，测定了弹性模量（modulus of elasticity, MOE）、抗弯强度（modulus of rupture, MOR）、杨氏模量E、断裂拉伸模量（tensile modulus of rupture, MOT）以及内结合强度（internal bond, IB）。研究结果表明，粒径级配对桃花心木锯屑刨花板的物理及力学性能均存在显著影响。本次实验的热压温度设定为160℃，所制备板材的弹性模量（MOE）与抗弯强度（MOR）均达到甚至远超美国国家标准ANSI A208.1-2016规定的性能阈值。根据密度测试结果，该桃花心木锯屑刨花板可划分为低密度与中密度两类板材。但其厚度膨胀率与吸水率未符合ANSI A208.1–2016标准[1]，因此该制备板材仅可应用于干燥环境中。
