Parabolic Sodium Sulfate Metering Curves for High Cover Factor Canvas Reactive Dyeing
Parabolic sodium sulfate metering prevents surface ring dyeing in high cover factor cotton duck by maintaining constant dye exhaustion velocity across dense yarns.
Dye Bath Conductivity Feedback
Feedback Mechanism
Control mechanisms monitor the salt concentration in real time during the exhaust dyeing of cellulosic fibers. Implementation of dye bath conductivity feedback allows the automation system to adjust the dosing of electrolytes based on the electrical resistance of the liquor. This method ensures that the ionic strength remains within the specified range for optimal dye migration.
Signal Response
Probes submerged in the liquid stream transmit data to the central processing unit. The dye bath conductivity feedback triggers a pump to stop or start the flow of brine.
Process Repeatability
Consistency between batches improves when the salt levels are managed through active measurement instead of fixed recipes. Because dye bath conductivity feedback accounts for variations in water quality and chemical purity, it reduces the risk of shade variation across different production lots. Mill managers rely on these charts to verify that the target conditions were met throughout the entire cycle.
Hardware Limit
Fouling of the electrodes by hydrolyzed dye or impurities can skew the results and lead to incorrect dosing. Maintenance of the dye bath conductivity feedback system requires cleaning and inspection of the sensors to prevent drift in the readings. High temperatures also affect the baseline resistance and require thermal compensation algorithms to stay accurate.