Lab Dip Approval against Bulk Shade under Three Illuminants
Tri-illuminant shade approval aligns lab dips with bulk by enforcing primary D65 visual matching alongside secondary TL84 and Illuminant A metameric tolerances.
Jet Dyeing Exhaustion
Deposition Rate
High-velocity liquid circulation transports textile dyestuffs from aqueous solutions onto synthetic or blended yarns inside pressurized vessels. Monitoring jet dyeing exhaustion tracks the percentage of dye molecules absorbed by fabric as temperature increases over time. Complete exhaustion maximizes dye yield while reducing residual chemical loading in mill effluent streams.
Processing parameters balance liquor flow speed and heating rates to prevent un-level color absorption on knitted fabrics.
Liquor Dynamics
Venturi nozzles propel rope-form fabric through liquor tubes to maintain constant bath contact during exhaust cycles. Controlled jet dyeing exhaustion relies on mechanical pump pressure to cycle the full fabric length through the nozzle every forty seconds. Rapid circulation prevents temperature localized spots that cause shade streakiness in micro-polyester knits.
Lowering liquor ratios from ten-to-one down to five-to-one increases dye concentration and speeds absorption rates.
Process Checkpoint
Photometric spectrophotometers measure light absorbance in sample bath liquid extracted during cycle holds. Dyes exhausting under eighty-five percent yield require chemical addition or extended hold times at top temperature.
Substrate Constraint
Delicate silk and wool blends distort under extreme hydraulic nozzle pressures required for high-speed liquor circulation. Mechanical abrasion on delicate fabric surfaces restricts vessel speed adjustments during exhaustion cycles.