Abstract
In order to measure the crimp content of fibers numerically, three methods were applied; (a) which is derived from the wave-length of crimp, (b) from the Japanese Industrial Standard and (c) from strain-stress curve of the crimped fiber. It may be concluded that the method derived from the strainstress curve of fiber was the most reasonable. In this method, the crimp content was calculated from the distance between the origin and the intersecting point of co-ordinate and tangent which is made at the 7% elongation of stress-strain curve of the fiber. From this distance the value of crimp content was calculated.
In view of the application as well as the theoretical evaluation of the test result, the permanence of crimp is more important than the crimp content. Then the loads varying from 5 to 15% of tensile strength of the fiber were given to crimped fiber twenty times repeatedly, and the decease in crimp content was measured.
As the result of the above tests on various kinds of fibers, it was shown that both the crimp content and the crimp permanence were greatest in wool.
