Standard Salt Dosing Schedules for Reactive Dyeing Heavy Cotton Canvas
Progressive exponential salt dosing prevents surface strike spikes and forces reactive dye penetration into heavy cotton duck yarn cores.
Face to Back Shade Variance
Visual Metric
Colorimetric differences measured between the technical face and technical reverse of a single fabric construction indicate cross-sectional dyeing or finishing inconsistency. Such face to back shade variance arises from unequal dye application, asymmetrical radiant heat drying or uneven chemical padding pressures across continuous ranges. Inspection protocols measure colour coordinates across both sides using standard CIELAB colour space metrics under D65 illuminants.
Large Delta E values between fabric faces lead to visible shade mismatching when cut garment panels are assembled during apparel manufacturing.
Root Cause
Intermediate infrared predrying units that apply unequal heat to upper and lower fabric faces drive dye migration toward the hotter surface. In exhaust dyeing, compact woven twill fabrics with unbalanced surface structures experience differential liquor penetration between tightly woven faces and open backs.
Evaluation Protocol
Spectrophotometer measurements take multiple readings across both surfaces of conditioned fabric swatches following standard ISO 105-J03 calculations. Commercial tolerances typically cap total colour difference at Delta E equal to zero point eight for solid apparel piece goods.
Commercial Parameter
Face to back variations constitute fatal quality defects in reversible outerwear fabrics and single-ply unlined garments. Coated, laminated or single-side printed textiles operate under separate specifications that exempt reverse faces from visual colour matching standards.