Automated Caustic Dosing

Mass Equilibrium

Continuous alkali application consumes sodium hydroxide through chemical reaction with cellulosic impurities and mechanical carryover on wet fabric. When grey cotton enters a mercerization range, liquid automated caustic dosing supplies fresh chemical solute to balance the drag-out loss from wet pickup. Feedback loops measure bath density and fluid flow, triggering positive displacement pumps to alter injection rates within seconds.

If fabric speed increases, the volumetric delivery scales proportionately to preserve chemical potential across the impregnation trough. Precise metering prevents bath exhaustion, maintaining consistent fiber swelling without manual titrations or batch adjustments.

Chemical Deviation

Inaccurate alkali delivery alters fiber cross-sections and dye site accessibility across woven rolls. Variable automated caustic dosing disrupts cotton fiber mercerization, generating streaky dye uptake during subsequent reactive dyeing operations. Insufficient chemical addition leaves unswollen lumen structures, whereas excessive concentration weakens yarn tensile strength and wastes chemical inventory.

Mill verification requires logging continuous dosing rates alongside mass balance records for every production lot.

Quality Boundary

Automated liquid feeding equipment operates reliably within specified fluid viscosity and supply pressure boundaries. Extreme ambient temperature shifts change liquid viscosity, causing pump displacement errors if compensation algorithms are absent. Liquid dosing equipment requires routine calibration of flowmeters and dosing valves using known liquid standards.

Processing stops whenever feedback signals exceed control limits, protecting goods from over-alkalization.