Abstract
In weaving the specimen viscose rayon yarn a constant repeated extension was given to it under different base tensions, and the residual elongations obtained was measured.
The results obtained are as follows;
(1) When the repeated extension of 1% strain was given to the yarn varying base-tension ranging 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.50 (g/d) it was found exsistence of a point where the residual elongation suddenly increases, the tension at that point being about 0.35g/d.
(2) Applying different frequencies of extension ranging between 100, 200, and 300 (c. p. m.) the same result as in the above (I) was obtained.
(3) The number of extensions cause the breakage of 10% of the yarn. The number of breaking increases with the increase of the frequency and it occurs clearly at above 0.35g/d.
(4) The change in the mechanical properties of the yarn caused by the repeated extensions brings the increase of extensions to some extent with the repetition in Young's modulus and breaking strength, while elongation decreases to some extent.
