Greige Preparation Parameters for Heavy Woven Cotton Twill
Preparation of heavy cotton twill requires 85-degree flame singeing, dual-dip enzymatic desizing, open-width alkaline scouring, and 28 Baumé mercerization.
Baumé Concentration
Solution Strength
Liquid density measurement quantifies the mass of dissolved solids per unit volume in caustic mercerization baths. Baumé concentration governs the swelling action of sodium hydroxide solutions during alkaline treatment of cotton yarns and woven fabrics. Mill operators track degrees Baumé to maintain precise chemical strength within mercerizing ranges, typically held between fifty and sixty degrees Twaddell equivalents for optimal cellulose modification.
Bath Control
Solution density directly correlates with active alkali content inside continuous liquid processing machinery. Hydrometers floating in the circulating liquor measure buoyancy to determine active chemical concentration before textile impregnation begins. Temperature variations alter liquid density readings, requiring automatic thermal compensation or manual conversion tables to maintain accuracy during high speed production runs.
Fiber Swelling
Caustic penetration alters the molecular orientation of cellulose chains inside raw cotton fibers. Radial swelling occurs as sodium hydroxide breaks internal hydrogen bonds, transforming native cellulose one into alkali cellulose. Tension applied during this reaction locks the modified crystalline structure in place, producing permanent luster and enhanced dye affinity across the finished textile goods.
Chemical Recovery
Spent liquor collection systems drain excess alkali from the saturated fabric web after the reaction zone. Evaporation units concentrate weak wash water back to standard operating density before returning the liquid to the primary application trough. Closed loop management reduces chemical waste and protects downstream neutralization baths from sudden pH spikes.