Assigning Spinning versus Sizing Root Causes in High Speed Weaving Faults
Differentiating spinning and sizing root causes requires cross-sectional microscopy and high-speed tensile testing to map size encapsulation against yarn mass variation.
Size Pickup
Quantitative Measure
Weight of the dry sizing agent added to the yarn expressed as a percentage of the original yarn weight provides a metric for process control. Accurate size pickup is necessary for ensuring the yarn can withstand the mechanical rigors of the weaving shed. Typical values for linen range from eight to fifteen percent depending on the yarn count and loom type.
Technicians calculate this value by comparing the weight of a yarn sample before and after the slashing process.
Add-on Calculation
Variations in size concentration and squeeze pressure directly influence the final amount of material remaining on the yarn. A reliable size pickup requires stable temperature and viscosity in the size box. If the pickup fluctuates, the weaver will experience inconsistent breakage rates across the width of the cloth.
This data is recorded on the slasher production report for every beam.
Loom Performance
Excessively high pickup makes the yarn brittle and prone to snapping, while low pickup leaves the yarn vulnerable to abrasion. Finding the optimal level of size pickup involves balancing the cost of chemicals against the gains in weaving efficiency. Buyers often request these percentages to verify that the fabric has been prepared according to industry standards.