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.
ASTM D1574
Material Specification
Quantitative solvent extraction provides a standard method for determining the grease content remaining in scoured wool. Industry practitioners utilize astm d1574 to isolate and weigh the non-fibrous matter that persists after industrial cleaning. This metric defines the cleanliness of the raw material before it undergoes spinning or combing.
Extraction Process
Laboratory technicians weigh a dry sample and place it inside a Soxhlet extraction apparatus to begin the wash cycle. A specific solvent, usually dichloromethane, circulates through the fibres to dissolve fats and suint. When astm d1574 is performed, the solvent evaporates in a flask, leaving behind a residue of wool grease.
Final weighing occurs after the residue reaches a constant mass in a desiccator.
Residue Assessment
Residual grease levels influence the friction and drafting behavior of the wool during yarn formation. High values resulting from astm d1574 suggest that the scouring liquor was exhausted or the temperature was insufficient. Low values confirm that the fibre is ready for high speed processing without gumming the machinery.
Processing Impact
Buyers use this result to verify that the wool meets the commercial grade specified in the purchase contract. Deviation from the expected astm d1574 limit leads to adjustments in the scouring recipe.