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The strain recovery elasticity caused by the rapid removal of m2 from the load (m1+m2) on a fiber was studied for the nylon-6 fibers in water. The initial velocity _??_1 at t(time)=0 of strain recovery is given by where C1 is the spring constant, m1 is the constant load on a fiber, m2 is the removal load on a fiber and G is the gravitational acceleration. The value of C1 obtained is about 2.66×107dyne/cm at a light load of m1 (_??_0.03g/d) and about 3.6×106dyne/cm at a load m1 over 0.19g/d, respectively. The former is almost equal to that of the nylon-6 crystal and the latter is in the range of C1 (3.35×106_??_6.21×106dyne/cm) of the high tenacity yarns of nylon-6.

MEASUREMENT AND ESTIMATION OF STRAIN RECOVERY ELASTICITY IN NYLON-6 FIBERS