红麻结构与物理性质的研究

Study on structure and physical properties of kenaf

对红麻的宏观、微观结构和物理性质进行观察测定。结果表明,红麻秆的管孔排列与阔叶树散孔材相近,射线细胞等薄壁细胞较多,纤维细胞壁较薄。分析红麻秆高度对物理性能的影响。结果表明,密度从基部到梢部逐渐增大;含水率从基部到梢部逐渐减小;气干、全干干缩率的大小为弦向>径向>纵向,中部差异干缩最大,径向气干湿胀率最大,弦向全湿胀率最大,纵向干缩率和湿胀率均为负数,纵向没有参与干缩湿胀。在浸泡前期(<50h),吸水性的大小为中部>基部>梢部,50h后,吸水性的大小为基部>中部>梢部。

Macroexamination and microexamination observations of the structure and physical properties of kenaf indicated that the pore arrangement of kenaf and the diffuseporous wood of hard wood was familiar,much more parenchyma cell such as ray cell and the cell wall was thin. Based on the analysis of the relationship between physical property and kenaf′s height or spot. The following conclusions were reached： kenaf density increased gradually from base to tip; kenaf moisture rate reduced gradually from base to tip; air drying and white drying rate was tangential partradial partportrait part; shrinkage in the middle part was the biggest one. The swelling rate reached the maximum in radial; bulking factor in tangential was the smallest. Shrinkage and swelling in portrait part was minus, so the portrait part did′t shrink or swell. In the first 50 h of soaking, the hydroscopicity was middle partbase parttip part. After 50 h, base partmiddle parttip part.