Progressive Electrolyte Metering Schedules for Low Liquor Jet Dyeing Heavy Duck
Progressive electrolyte metering controls reactive dye strike rates on heavy duck canvas in low liquor jets, preventing unlevelness and core shading defects.
Sodium Sulfate Dosing
Electrolyte Purpose
Inorganic salt additions to reactive dyebaths reduce negative surface charges on cellulosic fibers, encouraging dye molecule migration onto substrate polymers. Sodium sulfate dosing delivers high-purity Glauber salt into dye liquor to promote exhaustion of reactive and direct colorants. Unlike sodium chloride, sodium sulfate exhibits non-corrosive properties toward stainless steel dye vessel surfaces, extending machinery operational life.
Precise salt quantification ensures consistent dye yield without causing bath instability or dye precipitation.
Solubility Kinetics
Anhydrous sodium sulfate dissolves readily in warm water, generating neutral electrolyte solutions that do not alter bath pH. Adding dry salt directly into dye vessels can cause localized concentration spikes, causing premature dye aggregation. Automated chemical preparation tanks dissolve salt completely before metering concentrated brine into main dye liquor loops.
Controlled brine addition prevents spotty dye deposition on sensitive knitted goods.
Bath Metering
Reactive dye formulas require substantial electrolyte quantities to drive colorants out of aqueous solution. Dosing systems feed salt brine according to programmed progressive profiles, matching exhaustion kinetics to specific dye combinations. Metered additions preserve bath levelness and prevent surface ring-dyeing on dense cotton yarns.
Effluent Load
Wastewater treatment plants measure dissolved sulfate ions released from dyehouse discharge streams to comply with environmental regulations. Dyehouses optimize salt dosing volumes to achieve maximum dye exhaustion while reducing total salt discharge into municipal sewers.