Mill Experiences With On-Line Ultrasound Based Stiffness Measurements, 1999 Engineering Conference Proceedings
ABB has developed an on-line Ultrasonic Specific Stiffness Sensor. The sensor has been installed on a paper
machine producing Linerboard in the range of 40-90-lbs/1000 sq.-ft. and the measurement has operated reliably for
6 months. This report summarizes the on-line measurement performance and emphasizes field test results.
Many of the relationships expected between paper stiffness, process parameters, and paper ‘strength’ are confirmed.
The impact of process upsets and grade changes on stiffness properties are tracked. For example, increasing the
rush-drag ratio is shown to increase both the on-line CD Specific Stiffness and the QC laboratory CD Ring Crush
and Ring crush indexes. These and other results provide the basis for improved product quality and reduced
production costs.
Mill Experiences With On-Line Ultrasound Based Stiffness Measurements, 1999 Engineering Conference P