Ultrasonic Foil (papermaking)
The drainage table section of a paper machine has a series of hydrofoil blades (called foils) to 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 ends up in better fibre formation, stronger paper and smoother paper surfaces.
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Famous quotes containing the word foil:
“Within his crib is surest ward,
This little babe will be thy guard,
If thou wilt foil thy foes with joy,
Then flit not from this heavenly boy.”
—Robert Southwell (1561?–1595)