1.When the original yarn is purchased, the yarn is too thin. For example, the actual measurement of 40 yarns is only 41 yarns.
2. Insufficient moisture regain. Fabrics that have been printed and dyed lose a lot of moisture during drying, and the specifications of fabrics refer to the gram weight under standard moisture regain. Therefore, when the weather is dry and the dried cloth does not fully regain moisture, the gram weight will also be insufficient, especially for natural fibers such as cotton, linen, silk and wool, and the deviation will be very large.
3. The raw yarn wears greatly during the weaving process, which will cause excessive hairiness to fall off, resulting in thin yarn weaving and low gram weight.
4. Re-dyeing during the dyeing process will lead to a large loss of yarn and cause the yarn to become thinner.
5. In the process of singeing, the firepower of singeing is too large, which leads to the over-drying of the cloth surface, and the yarn is damaged and becomes thinner during desizing.
6. The damage of caustic soda to the yarn during mercerizing.
7. The damage to the cloth surface caused by scratching and sanding.
8. Finally, the density does not meet the technological requirements. It is not produced according to the specifications, and the weft density and warp density are insufficient.