蓖麻秆不同部位的特性及其对蓖麻秆刨花板性能的影响

蓖麻Ricinus communis秆皮部、木质部和髓部的显微构造差异显著，对各个部分的原料特性、各部分对刨花板性能的影响进行了分析研究，并探讨了各个不同部位的工业化利用情况。结果表明，蓖麻秆的各个层次的理化性能差异显著，蓖麻秆中的酯类物质和二氧化硅主要富集于蓖麻秆的皮部和髓部。髓部主要是由薄壁细胞组成，可对蓖麻秆刨花板的性能产生不利影响；将蓖麻秆的髓部去除后，除弹性模量外，板材的其他各项性能都得到了明显改善，板材的内结合强度增加3.3%，静曲强度增加19.7%，吸水厚度膨胀率减小18.82%。在蓖麻秆的工业化利用中宜将髓部去除；蓖麻秆皮部对人造板的性能不明显，在蓖麻秆的工业化利用中可以保留皮部。图2表4参12

Feasibility of castor stalks for particle boards

In the castor （Ricinus communis） stalk there are major differences in the microstructure of the phloem,xylem,and marrow. This research studied raw material characteristics in different layers of the castor stalk and their influence on properties of castor stalk based particle board for industrial use. Results of the physical and chemical properties of the castor stalk layers showed that lipid material and SiO2 were enriched in the surface layer of the phloem and marrow. The marrow had a negative influence on the castor stalk based particle board due to its parenchyma cells. Except for the modulus of elasticity （MOE） that increased 19.7%,removing the marrow improved particle board properties with internal bond strength （IB） increasing 3.3% and swelling thickness decreasing 18.8%. Phloem,however,did not influence board properties. Thus,for industrial use as particle board,the marrow of the castor stalk would have to be removed,but the phloem would not.