Cloth Fell Position Control and Fabric Quality
topic
Cloth fell position stability requires coordination of take-up rate and let-off rate to maintain the fell at a constant position relative to the reed beat-up point, with fell position variation causing pick density variation visible as bands in the fabric when the fell advances or recedes relative to the beat-up point due to mismatch between take-up rate and yarn consumption rate from varying fabric tension or elasticity.
Role
Prevents pick variation banding fabric defects caused by fell position instability that produces alternating zones of higher and lower pick density visible in finished fabric as horizontal bands parallel to the weft direction, with electronic coordination of take-up and let-off maintaining fell position stability that mechanical systems cannot maintain when weaving elastic yarns or complex pile structures with variable pick-to-pick weft consumption.