1, the yarn is too thin when the original yarn is purchased, for example, 40 yarn is actually measured only 41 yarn.

2. Insufficient moisture regain. After printing and dyeing, the fabric loses a lot of water when drying, and the specification of the fabric refers to the gram weight under the standard moisture recovery rate. Therefore, when the weather is dry and the dried cloth is not fully moistened, the gram weight will be insufficient, especially for natural fibers such as cotton, linen and wool, and the deviation will be very large.

3, the original yarn in the process of weaving wear is large, will lead to too much hair loss, resulting in yarn thinning and resulting in low weight.

4, re-dyeing in the dyeing process will lead to large yarn loss and lead to yarn thinning.

5, in the singeing process, the singeing fire is too large, resulting in the cloth surface is too dry, and the yarn is damaged during desizing, resulting in thinning.

6. Caustic soda damage to yarn when mercerizing.

7, scratching, grinding finish the damage to the cloth surface.

8, finally, the density does not meet the process requirements. Did not produce according to specifications, weft density, warp density is insufficient.