Electrolyte Dosing Rates in Low Liquor Jet Dyeing Heavy Cotton Duck
Progressive exponential electrolyte dosing prevents surface strike and core un-dyed voids when reactive dyeing heavy cotton duck in low liquor ratio jet machines.
Electrolyte Dosing Rates
Bath Concentration
Dyehouse chemical addition schedules dictate electrolyte dosing rates for reactive dyeing of cellulosic knitted fabrics in continuous pad-steam machinery. Mill operators control salt replenishment precisely to maintain uniform ionic strength across consecutive dyeing lots. High concentrations of sodium chloride or sodium sulfate promote exhaustion of reactive dyes onto cotton fibres by reducing the negative zeta potential on the cellulose surface.
Insufficient salt additions yield pale uneven shades, whereas excessive electrolyte levels cause premature dye precipitation and undesirable salt spots on finished goods.
Liquor Ratio
Bath volumes dictate chemical demand because liquor ratios establish absolute quantities of auxiliary agents required per unit mass of textile material. Dye liquor circulation pumps draw solution continuously through wound yarn packages or fabric ropes, ensuring uniform chemical distribution throughout the textile substrate. Fabric density directly affects the quantity of liquor absorbed into the material structure, influencing how rapidly dissolved electrolytes deplete from the circulating bath.
Technicians calculate chemical weights relative to dry fabric mass rather than total bath volume when processing variable batch sizes to prevent concentration drift.
Exhaustion Kinetics
Temperature gradients accelerate dye migration during the fixation stage, requiring proportional adjustments to chemical feed intervals. High fixation temperatures increase reaction rates between reactive dye molecules and cellulose hydroxyl groups, altering salt consumption patterns within the dye bath. Automated dosing equipment regulates chemical delivery pumps based on real-time conductivity measurements inside the expansion tank.
Laboratory drop-weight tests verify that calibrated feed rates prevent hydrolysed dye formation while maximizing fixation yields on bleached cotton jersey.
Residual Conductivity
Effluent discharge limits govern allowable salt concentrations remaining in waste water streams after completion of the washing sequence. Environmental auditors measure total dissolved solids exiting the rinse compartment to verify compliance with local municipal sewer discharge permits. Rinsing efficiency depends heavily on adequate counter-current water flow to strip unreacted electrolytes from open-width woven fabrics before thermal drying.
Final electrical conductivity readings of extracted liquor confirm the complete removal of residual salts from finished garments prior to commercial packaging.