Design of fabric density and tightness
The size of the warp and weft densities of the fabric and the relative relationship between the warp and weft densities are one of the main factors affecting the fabric structure. It directly affects the style and physical and mechanical properties of the fabric. Obviously, if the density of warp and weft yarns is high, the fabric will appear tight, thick, stiff, wear-resistant, and strong; if the density of warp and weft yarns is low, the fabric will be thin, soft, and permeable. The ratio between warp density and weft density also has a great influence on the performance of the fabric. The yarn with higher density in the fabric will buckle more, and the effect of the yarn will appear on the surface of the fabric. In addition, the warp and weft density ratios are different, and the fabric styles are also different, such as plain cloth and poplin, twill, serge, gabardine and khaki, etc. Determining fabric density and tightness should be determined based on the performance and style of the fabric, such as the nature of the raw materials, the structure of the spinning yarn, and the thickness, organization, and structure of the fabric. There are many methods for determining the warp and weft density of fabrics. The following are commonly used. No matter which method is used, it needs to be corrected through production trial weaving. (1) Theoretical calculation method: Based on the interlacing of warp and weft yarns in the fabric, under certain conditions of yarn characteristics, fabric structure and structural phase, assuming that the spinning yarn is an incompressible cylinder, based on the basic calculation formula of compact fabrics, The maximum tightness and density of the fabric can be found. The maximum theoretical density of warp and weft yarns can be calculated by the following formula. The above is the warp and weft density calculated based on fabric structure theory. The differences between different tissues with the same average float length, as well as the influence of spinning yarn properties and weaving technology are not considered, so there is a certain discrepancy with the actual situation. Appropriate adjustments need to be made during product design, and further corrections need to be made during product trial weaving.
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