Hot Water Bath Pectin Extraction Loss Calculation in Wet Spinning Audit
Wet spinning hot water baths extract 2.5% to 5.5% dry pectin mass from flax rove, requiring gravimetric corrections to audit yarn counts and mass balance.
Water Hardness Calcium Binding
Chemical Reaction
Water treatment procedures in wet spinning mills prevent the precipitation of calcium and magnesium salts on flax yarn during the hot water drafting stage. Through water hardness calcium binding, specialized sequestering agents are added to the spinning bath to keep these metal ions dissolved in the water. Flax fibers are sensitive to water quality, and the high temperature of the spinning troughs can accelerate the formation of calcium carbonate deposits.
This chemical prevention is essential for maintaining the softness and flexibility of the flax fibers as they are drawn and spun.
Yarn Quality Effect
Uncontrolled calcium deposition on the flax fibers can lead to quality issues in the finished yarn. These deposits make the fiber bundles stiff and brittle, increasing the frequency of breakages on the spinning frame. Furthermore, yarn that contains calcium deposits will exhibit uneven dye absorption, resulting in streaking in the final dyed fabric.
Water Treatment Strategy
Monitoring the hardness of the water supply allows the mill to adjust the dosage of sequestering agents dynamically to ensure consistent spinning conditions. In addition to adding chemical binders, many mills utilize ion-exchange water softeners to reduce the initial concentration of calcium and magnesium ions before the water enters the spinning room. This combined approach of pre-treatment and in-bath binding ensures that the spinning troughs remain free of scale buildup and that the yarn retains its natural luster.
Regular testing of the trough water is conducted to verify that the binding capacity of the sequestering agents is sufficient for the volume of flax processed.