Yarn strength index
1. The main strength indicators of spinning yarn mainly include breaking strength, breaking stress, breaking strength, breaking length, breaking elongation, wet-to-dry strength ratio, 10% constant elongation load, etc., and the expression meaning and calculation method of the strength index of the fiber The same, see Chapter 3 for details, and will not be repeated here. 2. The strength of blended chemical fiber fabric yarn The strength of blended chemical fiber fabric yarn is not as intuitively imagined. If the weak strength is added to the strong strength, you will definitely get a medium strength. It is not only related to the strength of the fiber, but also closely related to the difference in the elongation ability of the blended chemical fiber fabric fibers. Assume that there are only two types of fibers 1 and 2 in the blended chemical fiber fabric yarn; the breakage of the spinning yarn is only due to fiber breakage without slipping; the fibers in the blended chemical fiber fabric yarn are evenly mixed; the linear density of the two fibers is the same. Under this assumption, there are three situations for the strength of blended chemical fiber fabric yarn: From formula (2-22), it can be seen that since P2>P1, so as n2 increases, the strength of the spinning yarn increases, that is, as the blended yarn As the ratio of strong fibers in chemical fiber fabric yarns to blended chemical fiber fabrics increases, the strength of blended chemical fiber fabric yarns increases. (2) When the two fibers in a blended chemical fiber fabric have a large difference in breaking elongation, and the strength of fiber 1 when breaking is greater than the tensile force of fiber 2 in the spinning yarn (P1>P2) (such as polyester-cotton Blended chemical fiber fabric yarn), the tension curves of the two fibers are shown in Figure 2-18(b). In this case, after the spinning yarn is stretched, the fibers in the spinning yarn obviously have two stages of breakage. In the first stage, fibers with small elongation ability are broken first, and in the second stage, fibers with high elongation ability are broken. When stretched to the breaking elongation of fiber 1, fiber 1 breaks first. At this time, the tensile external force F1 endured by the blended chemical fiber fabric yarn is:
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