Effect of Yarn Modulus on Deformation of Flanged Bobbini

Abstract

Stress distribution in the yarn package wound on the flanged bobbin is made clear by using the data of model experiment on which yarn packages are formed by several kinds of yarn that has different Young's modulus. They are also useful for obtaining the deformation of the flanged bobbin using the finite element analysis. The following results are obtained.
(1) The smaller Young's modulus of the yarn, the larger the radial load compressing the barrel of the flanged bobbin. Increasing rate of the radial compressive stress decreases with accumulated yarn layer.
(2) The smaller Young's modulus of the yarn, the larger the axial load expanding the flanges of the bobbin. Increasing rate of the axial expanding load increases with cumulated yarn layer.
(3) The radial load compressing the barrel of bobbin is larger than the axial load expanding its flanges.
(4) The smaller Young's modulus of the yarn, the larger the flanged bobbin deforms by internal stess in yarn package.The maximum deformation is generated near the root of its flanges.