Weft Density Setting for Different Fabric Constructions
topic
Weft density setting for the take-up system requires calculation of the target picks per centimetre from the fabric specification and the corresponding take-up advance per pick that achieves this density, accounting for the fabric take-up angle, fell position, and the difference between the woven-in pick spacing and the relaxed pick spacing in the finished fabric after washing that increases pick density by 5 to 15 percent as the warp and weft crimp redistributes during wet relaxation.
Role
Translates the fabric specification target pick density into the loom take-up setting required to produce it, with the relationship between on-loom and finished fabric pick density being an important design consideration that requires weaving at a lower pick count than the specification target to allow for the density increase during finishing, making this conversion calculation a routine but essential step in loom setup that prevents the systematic under- or over-pick density of fabric woven without the finishing relaxation correction.