Ultrasonic foil (papermaking)

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Ultrasonic foil installed under the wire on a paper machine

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,^[1] 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.

References

↑ "CVN Vooner Paper Machinery".

v t e Paper

History

Materials	Wood pulp Fiber crop Papyrus Paper chemicals

Types	Blotting Bond Construction Copy Cotton Crêpe Display Glassine India Kraft Laid Manila Newsprint Oatmeal Onionskin Origami Rag Rice Security Seed Tar Thermal Tissue Tracing Transfer Tree-free Wallpaper Waterproof Wax Wood-free Wove

Specifications	Size Density Units of paper quantity

Production	Papermaking Paper engineering Paper mill Paper machine Calender Sulfite process Kraft process Soda pulping Paper recycling

Industry	List of paper mills In Europe In Canada In Japan In the United States

Issues	Bleaching of wood pulp Environmental impact of paper Paper pollution

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