Nozzle Hydraulic Pressure Calibration for Jet Dyeing Dense Woven Fabrics
Dynamic nozzle pressure calibration balances liquor velocity and fabric rope speed, preventing mechanical chafe and shade streakiness on dense woven fabrics.
Warp Streakiness Correction
Defect Rectification
Systematic adjustment of yarn tension and comb spacing during looming eliminates lengthwise lines in interlaced fabrics. When visual inspection reveals warp streaks, warp streakiness correction is implemented to ensure a uniform fabric appearance before dyeing. This process addresses variations in yarn density and tension that would otherwise cause uneven dye absorption.
Tension Equalization
Non-uniform let-off and uneven winding of the warp beam generate tension variations across the width of the loom. To achieve warp streakiness correction, operators adjust the tension bars and warp stop motions to equalize the drag on all individual yarns. This adjustment prevents the formation of loose and tight warp bands in the grey fabric.
Loom Adjustment
Wear on the reed dents can cause localized bunching or spreading of warp ends. During warp streakiness correction, the reed is inspected and replaced if uneven spacing is detected. This mechanical maintenance ensures that the number of ends per centimeter remains constant across the entire width.
Preventing these density shifts is essential for fabrics that will undergo piece-dyeing where any density variation is heavily exposed.
Fabric Finishing
Post-looming processes can also minimize the visibility of minor tension variations in the fabric. When warp streakiness correction is completed in the finishing department, processes such as heat-setting and mercerization are used to relieve residual stresses.