Pulsating approach to spray control

Sprays for coatings can be controlled over much wider speed ranges by adopting pulse width modulation

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Sprays for coatings, whether for the food industry or industrial products, can be controlled over much wider speed ranges by adopting pulse width modulation.

This requires quick ‘on’ and ‘off’ turns - and the latter can be greatly accelerated by a sharp, negative pulse. This ensures more efficient application of coatings, at constant drop size, and also offers a way of switching solenoid operated valves more quickly for other applications

Just turning down the flow rate to a spray nozzle results in a larger drop size and different spray pattern. Raoul De Winne of Spraying Systems has been describing how his company considered using needle vales in nozzles, and even variable geometry nozzles, but then decided their new solution was far better.

Author
Tom Shelley

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