Comparing with yarns of ordinary fabric, the yarns of denim have certain particularity. Therefore, denim has different requirements for grey yarn.
The warps have higher breaking strength and elongation.
The technical process of warp is long. It is often bent and elongated. When it is woven, the loom tension should be bigger. Therefore, the requirement of warps for breaking strength and elongation of yarns are higher.
The maturity, leveling property and permeability of raw cotton is better.
The dyeing performance and rubbing color fastness of indigo dye is poor. Using the cotton yarns spun by cotton with poor maturity will easily cause uneven dyeing and dyeing defects, as color stain and color spots, etc. So the content of dead cotton and nep in cotton yarns should be reduced as much as possible.
The nep irregular fuzz of yarns is fewer.
The quantity of nep irregular fuzz will directly affect the product quality.
Have few yarn defects such as unevenness and bamboo knot.
General denim cloth requires fewer yarn defects, as unevenness and bamboo knot, etc. Otherwise they will influence the appearance and color shade of cloth and increase end breakage rate in production.
Winding capacity is bigger.
Generally, yarn count of denim is lower. The winding capacity of single bobbin yarn should be increased as much as possible to reduce fabric knots.
Correct fineness of yarns, Small weight deviation, Small weight unevenness
It needs to ensure the fineness of yarns, the weight deviation and the weight unevenness are in a reasonable range. Otherwise, it will directly influence the control of the standard grammage.
Post time: Jul-28-2023