Greige Fabric Storage Requirements and Preservation Standards
Unfinished greige fabric preservation demands humidity control between 50 and 65 percent relative humidity to prevent size retrogradation and oil oxidation.
Coning Oil Degradation
Chemical Alteration
Chemical breakdown of lubricating esters on synthetic yarn packages represents an irreversible alteration of surface auxiliaries during yarn storage. Liquid lubricants transform through coning oil degradation when heat and atmospheric oxygen convert unsaturated fatty compounds into insoluble polymer films. Filament packages stored under high humidity undergo hydroperoxide cleavage alongside ester hydrolysis.
Discoloured yellow rings and tacky deposits develop on yarn package shoulders over prolonged holding periods. Oxygen availability inside tightly wound cones establishes the physical boundary for this oxidative reaction.
Thermal Driver
Storage room heat accelerates peroxide accumulation inside unsaturated ester films. Elevated ambient temperature shortens the induction phase before auto-oxidation begins.
Dye Removal
Aqueous scouring mills cannot emulsify polymerized lubricant residues from grey knitted structures. Standard surfactant baths wash away unoxidized lubricants easily. Oxidized varnish spots block disperse dye penetration during high temperature dyeing cycles.
Fabric surfaces exhibit pale streak patterns wherever degraded oil remains bound to polyester filaments.
Inspection Threshold
Quality control testing measures free fatty acid concentration alongside peroxide values in solvent extracts. Solvent extraction using petroleum ether isolates surface oils prior to potassium hydroxide titration. Neutralization values exceeding two milligrams of potassium hydroxide per gram confirm advanced oxidation.
Mills reject incoming yarn lots when extract analysis reveals non-emulsifiable residues.