Quantifying Structural Yarn Tension Variance across Multi-Beam Creels in High-Speed Warping
Creel position frictional differential and package diameter decay drive warp tension variance, requiring dynamic compensation to limit loom stoppage rates.
Slasher Size Pickup
Chemical Add-on
The amount of protective starch or synthetic polymer applied to warp yarns during the sizing process is measured as a percentage of the dry yarn weight. This slasher size pickup provides the yarn with the abrasion resistance and strength needed to withstand the mechanical stresses of weaving.
Process Variable
Squeeze roll pressure and the viscosity of the size box contents are the primary factors that determine the final amount of coating. If the slasher size pickup is too low, the yarns will shed fibres and break in the loom, while excessive pickup makes the yarn brittle and difficult to desize. The roll pressure is usually adjusted based on the speed of the machine and the yarn count.
Quality Verification
Laboratory testing through desizing a sample or using a moisture-based refractometer confirms that the application meets the specification. Consistent slasher size pickup across the entire width of the warp prevents uneven tension and streaking in the finished fabric. Operators check the pickup levels at the beginning and end of every beam to ensure continuity.
Economic Impact
Chemical costs represent a large portion of the finishing budget, making over-application wasteful. Precision in slasher size pickup balances weaving efficiency against the cost of raw materials.