Winding Quality
The compactness of wound yarn on a perforated tube or cone determines the rate of fluid flow during package dyeing. An optimal package density is required to ensure that dye liquors circulate evenly through all layers of the yarn package. In flax processing, where the fibers are highly absorbent and swell when wet, this property is critical for achieving uniform color.
If the package is wound too tightly, the dye cannot penetrate the center, whereas a loose package will collapse under pump pressure.
Tension Control
Precise control of yarn tension and winding angle during the package preparation stage establishes the target density. Automated winders monitor the speed and pressure of the package against the drive roller to maintain a uniform structure. For linen yarn, which lacks the elasticity of wool or cotton, the winding tension must be kept within narrow limits to prevent localized packing.
The density is measured in grams per cubic centimeter before the packages are loaded onto the carrier of the dyeing machine. If the packages vary by more than a small margin, the liquor will follow the path of least resistance through the softer packages.
Dyeing Performance
Dye houses check the wound cones using a density tester to verify consistency across the batch. Any cones that fall outside the specified limits are rejected or rewound to avoid uneven dye absorption. Consistently achieved standards prevent the occurrence of light and dark patches in the finished woven fabric.
