Electrolyte Dosing Rates in Low Liquor Jet Dyeing Heavy Cotton Duck
Progressive exponential electrolyte dosing prevents surface strike and core un-dyed voids when reactive dyeing heavy cotton duck in low liquor ratio jet machines.
Shade Difference CMC Delta E
Colorimetric Tolerance
Mathematical calculation of color difference based on the l:c ratio of lightness to chroma simulates the human perception of shade variation. When fabric lots are dyed, the shade difference cmc delta e provides a single numerical value to determine if the color is acceptable. This metric helps dye houses achieve high consistency across different fabric rolls.
Ellipsoid Calculation
The CMC formula defines an elliptical tolerance volume around the target color in CIELAB space. In calculating the shade difference cmc delta e, the size of the ellipsoid adjusts automatically depending on the lightness and saturation of the standard color. This variable boundary matches human sensitivity to changes in neutral and bright shades.
Visual Acceptability
Handheld and benchtop colorimeters are used to compare production batches against the approved master sample. A shade difference cmc delta e of less than one is typically accepted by major clothing brands. This standard prevents panels of different shades from being sewn into the same garment, avoiding costly rejections.
Using a standardized tolerance ensures that both the supplier and the buyer have the same expectations for color matching.
Spectrophotometer Check
Daily spectrophotometric scanning of dyed swatches under controlled lighting conditions validates production quality. During this check, the shade difference cmc delta e is recorded and stored in the quality control system.