Web Weight Uniformity Measurement and Control
topic
Nonwoven web weight uniformity is monitored by nuclear gauge or beta radiation transmission sensors scanning across the web width during production, providing real-time weight profiles that detect cross-direction weight variation from card clothing unevenness, cross-lapper overlap inconsistency, and fibre clumping, with feedback control adjusting card doffer speed, cross-lapper speed, and fibre feed rates to maintain weight variation below five percent coefficient of variation.
Role
Maintains the web weight uniformity that is the primary quality parameter for nonwoven fabric applications from hygiene to filtration where weight variation translates into product performance variation, with online weight monitoring enabling continuous closed-loop control that detects and corrects developing uniformity problems before defective fabric accumulates to a level requiring roll rejection.