The authors studied theoretically the behavior of fiber bundles as they are de livered from the front rolls of a ring spinning frame and twisted. The causes of the long-term twist irregularity found in some yarns and their effects on yarn properties have been analyzed.
A theory of the biaxial tensile properies of warp knitted fabrics was developed in previous paper. The biaxial tensile properties of single tricot stitches with a close lap is calculable if the mechanical properties of yarn and fabric structures are given. In this paper, the biaxial tensile properties of some actual fabrics have been calculated by using the theoretical formula presented in previous paper. The properties have also been measured by using a biaxial tensile tester for the purpose of comparing with the theoretical values.A good agreement has been obtained between theoretical curves of the biaxial load-extension relation and the measured curves over the whole range from the initial tensile region to the ultimate region.It is concluded that the biaxial tensile properties of single tricot fabrics are calculable with good accuracy if the tensile properties of yarn and the structure constants of knitted fabric are given.
The shear deformation property of two-bar tricot fabrics is analyzed, and the theory for calculating this property is dereloped by using a structural model. A unit structure of the model is constructed of three arcs of front-bar yarn and three arcs of back-bar yarn, and these arcs are stretched under shear deformation. This theory covers the general shear defor mation of fabrics, for example, simple shear deformation, shear deformation under biaxial tensile deformation.
The biaxial tensile properties of single tricot warp knitted fabrics v ith an open lap have been calculated theoretically by developing the analysing method used on the close lap structure.
In previous paper, a biaxial tensile deformation theory was developed of a plain tricot fabric, a fundamental type for all lwo-bar tricot fabrics,. In the present paper, this theory is expanded and more generalized to calculate the properties of two-bar tricot fabrics. The structure of the model proposed for the plain tricot fabric is modified to make it adaptable to more complicated structure. When the number of wale spacings crossed by underlapping becomes large or when spun yarn is used, the original theory becomes more error-prone.To make the theory more precise, the compressive property of yarn should be introduced for calculation in stretching-effective region. In the new theory, a simple model where yarn is wound around a cylinder is used for the structure of the crossover region. Finally, some theoretical calculations have been done for various factors such as the tensile and the frictional properties of yarn, structural constants, and the number of wale spacings crossed by underlapping.
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