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.
Alkali Fixation Profile
Reaction Dynamic
Reaction rates in reactive dyeing depend on the sequential addition of alkaline agents to establish covalent bonds between the dye molecules and cellulosic fibres. An alkali fixation profile traces this pH progression and its direct effect on fixation yield over time. This reaction phase occurs after exhaustion is complete to prevent uneven dye distribution.
Process Variable
Controlling the rate of chemical reaction prevents localized rushes of dye onto the fabric, which would otherwise cause patchy shading. The alkali fixation profile determines how gradually the pH rises during the dye-fibre reaction stage. Technicians adjust this variable to match the reactivity of the specific dyestuff used in the batch.
Industrial Output
Fabric dyeing in industrial jet machines relies on controlled alkali dosing to achieve consistent shade reproducibility across batches. The alkali fixation profile ensures that the chemical reaction occurs at a rate compatible with the fabric turn time, allowing the dye molecules to distribute themselves evenly before forming permanent bonds. This rate matches the cycle speed of the machine to prevent stripiness.
Quality Metric
Testing the alkalinity at fixed intervals allows the dyer to plot the real-time curve and make adjustments. This profile indicates if the chemical reaction proceeded too rapidly.