Ultrasonic foil (papermaking) | Wikipedia audio article
Channel: wikipedia tts
Date: 05/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Ultrasonic_foil_(papermaking)





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SUMMARY
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An Ultrasonic foil is part of the drainage table section of  paper machines. A series of hydrofoil blades (called foils) create pressure/vacuum pulses that dewater the fibre/water slurry (called stock) on a moving conveyor belt (the wire). Flexible ceramic foils have been used for years, but ultrasonic foils produce paper of higher quality. High power ultrasonics create millions of pressure pulses from imploding cavitation bubbles which keep the fibres apart, giving them a more uniform distribution. This results in better fibre formation, stronger paper and smoother paper surfaces.