Treatment Process
Chemical washing procedures strip unreacted surface resins and neutralize free formaldehyde after high-temperature curing in resin-finished fabrics. Executing post-baking remediation restores fabric hand feel and lowers residual formaldehyde concentrations. Durable press finishing relies on resin crosslinking reactions that generate volatile byproducts if thermal curing is incomplete.
Mills run cured fabric rolls through continuous open-width washing ranges to stabilize chemical properties before final folding and packing.
Washing Chemical
Neutralizing wash liquors use alkaline hydrogen peroxide or sodium bisulfite to scavenge free formaldehyde molecules. During post-baking remediation, aqueous baths containing mild surfactants wash away non-crosslinked reactant monomer from cotton cellulose surfaces. Temperature control during rinsing is maintained between sixty and eighty degrees Celsius to maximize solubility without stripping crosslinked network bonds inside the fiber amorphous regions.
Mechanical vacuum extractors remove residual wash liquid before final stentering to prevent redeposition of solubilized chemicals.
Tensile Recovery
Washing off unreacted resin reduces fiber embrittlement and improves tear strength. Following post-baking remediation, fabric tensile strength increases slightly as unreacted crystalline surface deposits dissolve, restoring internal yarn mobility.
Process Limitation
Aqueous stripping treatments cannot reverse structural cellulose degradation caused by excessive acid catalyst exposure during baking. While post-baking remediation lowers free formaldehyde levels, over-baked fibers suffering severe hydrolytic cleavage remain permanently weakened. Insufficient washing time or cold rinse water leaves residual reactant on the fabric, causing progressive shade changes during commercial garment pressing.
