Optimizing Wet Pick up Values in Flax Warp Slashing
Optimizing flax wet pick-up between 80 and 95 percent balances film encapsulation with core penetration, minimizing loom warp breaks and sizing liquor cost.
Dry Size Add on Calculation
Solids Content
Mathematical formula establishes the quantity of dry solids deposited on the warp yarn surface. Performing a dry size add on calculation involves weighing a sample of sized yarn and comparing it against the original bone dry weight of the unsized warp. This figure represents the percentage increase in mass that protects the flax during weaving.
Gravimetric Analysis
Precision weighing occurs after the yarn reaches moisture equilibrium or undergoes oven drying to remove all liquid content. The dry size add on calculation relies on the difference between the oven dry mass of the sized yarn and the oven dry mass of the greige yarn. This data guides the operator in adjusting the squeeze roll pressure or liquor concentration.
Weaving Influence
Variation in sizing pickup directly impacts the efficiency of the loom by altering the yarn diameter and tensile strength. If the dry size add on calculation yields a value outside the target window of eight to twelve percent, the risk of yarn breakage or shedding increases drastically. Weavers use this value to verify that the protective film is thick enough to resist the abrasion of the reed.
Excessive pickup makes the yarn brittle and prone to snapping under high tension. Correcting the application rate prevents the accumulation of size dust in the weaving shed.