Greige Storage Conditions Impact on Subsequent Dye Absorption
Uncontrolled greige storage triggers moisture migration, lipid autoxidation, and sizing retrogradation, which impair surface wettability and cause severe dye absorption variances.
Autoxidation
Oxidative Degradation
Free radical reactions drive the uncatalyzed reaction of atmospheric oxygen with organic substrates at ambient or moderate temperatures. Unsaturated fatty acids present in natural fibre waxes or synthetic spin finishes undergo autoxidation during extended storage, generating reactive hydroperoxides and volatile organic compounds. The reaction initiates through hydrogen abstraction from allylic carbon sites, forming free radicals that rapidly bind ambient oxygen.
Unsaturated oils converted through this pathway polymerize into insoluble sticky residues on yarn packages and grey fabrics.
Fibre Degradation
Peroxide intermediates generated through organic oxidation accelerate the catalytic breakdown of cellulosic and synthetic polymers. Secondary radical species generated during autoxidation attack the glycosidic bonds of cotton cellulose, lowering the degree of polymerization and reducing yarn tenacity. Machine parts coated with oxidized spin finish oils exhibit high friction coefficients, causing uneven yarn tension and filament breakage during spinning or knitting.
Metal impurities such as copper or iron ions catalyze radical formation, accelerating heat generation inside dense cotton bales or tightly wound fabric rolls. Storage temperatures above thirty degrees Celsius combined with high relative humidity measurably increase reaction rates in grey goods warehouses.
Storage Exposure
Oxidized spin finish oils leave yellowish stains on stored synthetic yarns and grey cloth. These oxidized residues resist aqueous scouring and alkali emulsification, causing permanent color variations after dyeing.
Tensile Loss
Severe chemical degradation lowers cotton fibre molecular weight and tensile strength. Autoxidation lowers burst strength values in stored knitted fabrics before wet processing begins.