In-Plane Ultrasonic Testing of Paper and Board, 1993 Process & Product Quality Conference Proceedings
Maclin S. Hall
The measurement of the velocity of ultrasound provides a nondestructive means to determine the specific stiffnesses of paper. Instruments have been developed at the Institute of Paper Science and Technology (IPST) to make in-plane measurements on cut samples and on moving paper webs. These instruments are described and their capabilities illustrated with representative examples. The prospect for extending these capabilities to on-machine instrumentation are reviewed.