A Noncontact, On-machine, Laser Ultrasonic Sensor for Measuring Paper and Paperboard Bending Stiffness and Shear Rigidities, 2005 Papermakers Conference
An automated sensor has been developed for use during paper manufacture that can measure flexural
rigidity (bending stiffness) and shear rigidity (important, for example, for scoring or corrugating,). Based
on laser ultrasonic technology, this sensor provides continuous noncontact on-line measurements in either
the MD or CD at basis weights from 35 to 205 g/m2 at commercial web speeds. It has been successfully
tested on a pilot web handler and a pilot coater and is currently undergoing mill trials on a high speed
printing paper grade machine. The current laser ultrasonic stiffness sensor (LUSS) is easily integrated into
an existing ABB Smart Platform and uses data from that platform to compensate the LUSS measurements
for moisture, basis weight, temperature and web tension.
A Noncontact, On-machine, Laser Ultrasonic Sensor for Measuring Paper and Paperboard Bending Stiffne