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When comparing two fabrics with the same warp and weft spun density, the absolute density Pj and Pw of the warp and weft yarns should not be used to evaluate the tightness of the fabric, but the relative index of the fabric should be adopted. Degree to assess.

The warp tightness Ej of the fabric and the total tightness E of the fabric are expressed as the ratio of the area covered by the warp or weft in the fabric, or the total coverage of the warp and weft to the total area of ​​the fabric. Under the same conditions of the 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 both the warp and weft spun density and the factor of the spun yarn diameter, so that the tightness of the warp and weft yarns in the fabric can be more realistically reflected.

All kinds of fabrics, even if the raw materials and tissues are the same, if the tightness is different, the performance and appearance style will be different. Experiments have shown that the rigidity of the fabric with excessive warp and weft tightness increases, the wrinkle resistance decreases, the flat wear resistance increases, the wear resistance decreases, and the handle plate is hard. If the warp and weft tightness are too small, the fabric is too loose and lacks body bone.

It should also be pointed out that there is a positive constraint between the warp tightness, the latitudinal tightness and the total tightness. Under the condition of total tightness, when the warp and weft tightness ratio is 1, that is, the warp tightness is equal to the weft tightness, the fabric appears to be the closest and the rigidity is the greatest; when the warp and weft tightness ratio is greater than or When it is less than 1, the fabric is soft and the drape is improved. The warp and weft tightness of the fabric are different, which also affects the breaking strength of the fabric in the warp and weft directions.