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.
Polyvinyl Alcohol Cross-Linking
Polymer Immobilization
Chemical bonding of water-soluble sizing polymers occurs on warp yarns during high-temperature drying or heat setting. Industrial monitoring of polyvinyl alcohol cross-linking tracks the conversion of soluble sizing agents into insoluble macromolecular networks. Hydroxyl groups on adjacent synthetic polymer chains form ether linkages or acetal bridges under thermal influence.
Cross-linked size films resist conventional aqueous washing and require chemical cleavage. The reaction reaches completion when hydroxyl site availability drops under heat exposure.
Thermal Catalyst
Temperature exposure above one hundred and eighty degrees Celsius triggers spontaneous inter-chain reactions. Residual acidic catalysts from yarn spinning accelerate hydroxyl condensation.
Desizing Barrier
Insoluble size matrices resist hot water desizing baths and enzyme treatments. Water molecules cannot penetrate tightly cross-linked polymer networks during standard boiling scours. Alkaline oxidative desizing using sodium persulfate breaks chemical cross-links into water-soluble fragments.
Incomplete removal of cross-linked size creates blotchy areas during piece dyeing.
Solubility Test
Laboratory analysis measures dissolved size percentage after immersion in boiling water for thirty minutes. Weight loss differential between raw and washed samples indicates un-crosslinked binder fraction. Dissolution below ninety-five percent confirms extensive cross-linking within the sizing layer.
Sizing formulations incorporate thermal inhibitors to prevent uncontrolled polymer bonding during drying.