Compared with the general fabric yarn, the denim yarn has certain special characteristics, so the requirements for the original yarn are also different. Mainly in: 1. The warp has high breaking strength and elongation The warp yarn has a long process flow and is often subjected to repeated bending and elongation, The tension on the machine is large when weaving. Therefore, the warp yarn has higher requirements on the breaking strength and elongation of the yarn.
2. The maturity, levelness and permeability of raw cotton are better
Indigo dye has poor dyeability, poor color fastness to rubbing,
Cotton yarn spun with poor maturity cotton is easy to cause uneven dyeing.
It leads to defects such as colored flowers, stains and white stars.
Therefore, the content of stiff petals, dead cotton and neps in cotton yarn should be minimized.
The amount of yarn hairiness directly affects the quality of subsequent products. It is difficult to separate yarns in the process of hairy sizing and warping, and the number of broken ends increases. At the same time, it will also cause the dye liquor to become cloudy and thick, and even the pipeline will be blocked.4. Fewer yarn defects such as evenness and slub For general denim, the yarn requires less yarn defects such as evenness and slub, otherwise it will affect the appearance and shade of the fabric, and increase the production end breakage rate.5. Large winding capacity Generally, denim yarns have a lower count, The capacity of single-spool yarn winding should be increased as much as possible to reduce the knot on the cloth surface. It is more obvious when weaving on a shuttleless loom.
6. The yarn fineness is correct, the weight deviation and weight unevenness are small Denim yarn still needs to ensure the fineness of the yarn, The weight deviation and weight unevenness are within a reasonable range, Otherwise, it will directly affect the control of the gram weight per square meter.
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