THE STUDY ON THE STRUCTURE OF THE BLENDED YARNS

Though already several years ago, the method of estimation of fiber distribution in the crosssection of the blended yarns has been reported by us, now a more improved method is described here in addition to the previous method.At the first the blended yarns were passed through the celluloid plates in which is bored a hole with a needle and the photographs, enlarged by the microscope of the cross-section of the sample which is made by passing the yarns through that hole and cut, are used as data.The results obtained are as follows:(1) The mutual mixing aspects of the component fibres which are calculated at the cross-section by means of sampling are different from the results obtained previously by means of continuous cutting, and the yarn evenness and the blend irregularity in the longitudinal direction show the significant difference with the values obtained between the long and the short distances in the yarns.(2) The formula modified the Coplan's formula which induced the theoretical CV% was calculated and when the actual CV% was compared with this modified CV%, the cotton fibre in which cotton and rayon staple fibres are blended, or the fibres with the finer denier in the blend of the rayon staple fibre members show to have a tendency to form sectionally larger groups.(3) The ranges for the distribution of the number of component fibres through the cross-sections deviate from theoretical ranges calculated with 99% confidence limit. The range of the percentage of the blended fiber do not deviate from the theoretical as those of the same confidence limit.