シュロ繊維の強度におけるばらつきの低減方法の提案

抄録

Currently, biodegradable plastics capable of soil decomposition are attracting attention, but they have drawbacks such as low strength. Therefore, it is necessary to reinforce strength by using biodegradable fibers such as natural fibers. However, there are dispersions in strength of natural fibers. In this paper, we propose a method to reduce dispersions in strength of palm fibers, which is a natural fiber. Palm fiber ware subjected to a tensile test using a tensile tester at a speed of 1.8mm/sec, and Weibull analysis was performed. As a result, for fibers with a cross sectional area between 0.0582mm² and 0.0118mm², the shape parameter of strength was 5.4 or more. This is the same shape parameter as glass fiber. From this, it was found that there is a possibility of reducing dispersions in strength by managing fibers with the cross sectional area. Also, the shape parameter of the strength of the fiber with large cross section became lower. We considered the vascular bundle to be the cause of this and observed the cross section. As a result, as the cross sectional area increases, the ratio of the cross sectional area of the vascular bundle to the cross sectional area of the fiber is widely distributed from 1% to 20%. From this, it can be concluded that the cross sectional area ratio of the vascular bundle is widely distributed as one of the reasons why the shape parameters are lowered when the cross sectional area of the fiber is large.