UNDERWIRE WATER WEIGHT TURBULENCE SENSOR

摘要

A system of providing on-line turbulence measurements in a papermaking machine. The measurements are used to perform on-line adjustments to turbulence-inducing and adjusting elements in the papermaking machine to optimize final sheet product quality. Turbulence measurements are obtained using water weight sensors (23) in the wet end of the papermaking machine, specifically, under wire water weight measurements. Water weight readings are correlated to turbulence intensity levels. A turbulence processing sensor (25) sorts accumulated water weight measurement readings into intensity level intervals to obtain turbulence measurements or a turbulence profile. The trubulence measurements or profile is provided to a machine element controller (26) which uses the measured turbulence information and target turbulence information to generate control signals. Water weight sensors can obtain independent machine direction (MD) and cross machine direction (CD) water weight measurements and consequently independent turbulence measurements can be determined so that turbulence can be controlled in both directions. Machine elements are controlled so that turbulence remains uniform across the CD and so that the MD turbulence profile is optimized to resemble a target profile.