抄録
Velocities of shrinkage and creep of pure PVC-fibers, spun from tetrahydrofuran solution and drawn to some ratios, were measured in hot air suspending various loads. As the fiber shrinks when load is light and lengthens by heavy load, the load with which the fiber neither shrinks nor lengthens may be considered as “SHRINKING FORCE” of the fiber (cf. K. Fuchino et al, this journal, 7, 9 (1951)): but this conception is not applicable to this PVC-fiber, since there are some dependency to time in its strain change. Since the shrinkage takes place earlier than the creep there occurs maximum shrinking point in these processes, because the retardation period for shrinkage may be shorter than the one for creep. At higher temperature the velocity to arrive at the max. pt. grows fast. The fiber drawn to larger ratio has larger activation energy and shrinks more in total result than the less drawn one, because the former is harder to creep by its crystallinity.
