Cold Pad Batch Dosing Pump Ratio Calibration Procedures
Dosing pump ratio calibration in cold pad batch dyeing prevents reactive dye hydrolysis, shade tailing, and costly bulk fabric rejections.
Reactive Dyestuff Fixation Rate
Fixation Metric
Chemical bonding efficiency quantifies the ratio of dye molecules covalently anchored to cellulose fibre surfaces relative to the total quantity applied within a dyebath. Reactive dyestuff fixation rate represents the proportion of colorant that resists removal during subsequent rinsing cycles. High values demonstrate that molecules have successfully reacted with hydroxyl groups on the cotton polymers.
Low values indicate that pigments remain physically adsorbed or trapped in the fibre matrix rather than chemically linked.
Processing Yield
Mill operations rely on this percentage to calculate total pigment consumption versus wash-off requirements. A reactive dyestuff fixation rate determines the intensity of the discharge water treatment necessary at a facility. Effluent containing large amounts of hydrolyzed, unreacted material requires additional coagulation stages to meet local environmental standards.
Colorfastness Relation
Shade longevity depends heavily on the degree of molecular permanence achieved during the application phase. The reactive dyestuff fixation rate limits the amount of loose dye available to leach out under wet conditions or laundering stress. Garments constructed with high bonding efficiency maintain color depth after multiple wash cycles.
Products missing these thresholds suffer from poor washfastness ratings and inconsistent shade matching across production lots.
Testing Method
Laboratory analysis identifies the ratio through the extraction of unfixed colorants from a weighted sample of finished fabric. Technicians use spectrophotometric equipment to measure the absorbance of the residual liquid against a calibrated standard. This reactive dyestuff fixation rate establishes the chemical efficiency of the bath application cycle.
Differences between theoretical maximums and observed results define the waste profile for a specific dye chemistry and fibre combination.