Ultrasonic foil (papermaking)

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[edit] Ultrasonic foil

High power ultrasonics are used in the ultrasonic foils under the formation wire in a paper machine to produce paper of higher quality. On the top side of the formation wire over an ultrasonic foil, in the stock (fibre/water slurry), millions of pressure pulses from imploding cavitation bubbles will keep the fibres apart, giving them a more uniform distribution. This will end up in better fibre formation, stronger paper and smoother paper surfaces.

Cited articles:
Environmental Innovation 2005 http://www.miljoforum.n.se/images/vi05eng.pdf
Ultraljud spar fibrer på bruken http://www.nyteknik.se/art/46756