STUDIES ON THE STRUCTURE OF BLENDED YARN

The specimens of each blended proportion of cotton and rayon staple fibre blended yarn of different length being used, were made for continuous strength test and the following results were obtained on the basis of mean strength T.(1) A curve formula of second degree was applied to the cumulative frequency distribution in strength below T.A tension to hold the number of yarn breaking below 1% (To) was estimated, and an examination of the conformity to measured values is further made.(2) The distribution of yarn breaking points, based upon the assumption that tension T is given for each specimen respectively, approached to nearly equal distances as rayon staple fibre proportion increased, which shows that the partial continuity of similar strength decreases as yarn evenness is decreased.(3) In comparing the strength of the specimens different blendings, not only the specimen length used but also these auto-correlation coefficient must be considered, and when each strength test at 50cm test length fit for such purpose was compared the lessening of strength is shown with significant difference among the specimens, with the increased rayon staple fibre percentage.