A Laboratory Laser-Ultrasonic Instrument for Measuring the Mechanical Properties of Paper Webs.

For the paper industry, stiffness properties are an important parameter for producing more efficiently a fibrous material like paper. Some stiffness properties of paper webs can be obtained in a non-contact fashion using two lasers. The authors have developed an automated laboratory laser-ultrasonics instrument for paper, described here. The results of non-contact laser generation and detection of ultrasound are also presented. The paper grades investigated were heavy grades like linerboard, as well as copy paper. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]