Tightness of fabric
When comparing two fabrics with the same structure but different warp and weft yarn densities, the absolute density Pj and Pw of the warp and weft yarns cannot be used to evaluate the tightness of the fabric. Instead, the relative index of the fabric, that is, the tightness of the fabric, should be used. To evaluate. The warp tightness Ej, weft tightness Ew and total fabric tightness E of the fabric are expressed by the coverage area of the warp or weft yarns in the fabric, or the ratio of the total coverage area of the warp and weft yarns to the entire area of the fabric. Under the same conditions of fabric structure, the greater the tightness of the fabric, the tighter the fabric. It can be seen from the above formula that the tightness includes not only the density of warp and weft yarns, but also the diameter of the yarns, so it can more truly reflect the tightness of the warp and weft yarns in the fabric. Various fabrics, even if the raw materials and structures are the same, if the tightness is different, the performance and appearance style will be different. Experiments show that fabrics with excessive warp and weft tightness have increased rigidity, decreased wrinkle resistance, increased flat abrasion resistance, decreased torture resistance, and a hard feel. If the warp and weft tightness is too small, the fabric will be too loose and lack body bones. It should also be pointed out that there is a certain restrictive relationship between the meridional tightness, the latitudinal tightness and the total tightness. Under the condition that the total tightness is certain, the warp and weft tightness ratio is 1, that is, when the warp and weft tightness is equal to the weft tightness, the fabric appears tight and rigid; when the warp and weft tightness ratio is greater than or less than At 1 hour, the fabric is softer and has improved drape. The difference in tightness in the warp and weft directions of the fabric also affects the breaking strength of the fabric in the warp and weft directions.
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