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Does Non-Destructive Strength Sensing have Muscle?

The question whether ultrasonic measurements of paper stiffness (sonic stiffness) can predict usual paper properties we report every day in our machine test rooms is one that is often asked. The introduction of laboratory measurements for tensile stiffness and orientation angle, have really improved the operation and quality control around the paper machine. The measurement offers a reliable and trustworthy measurement of sonic stiffness in the md and cd and often at various angles and can give indication of the way the fibres are laid down in the sheet allowing control of nasty surprises at the converter like warp and curl. Many people believe that is enough and well done.

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