Nozzle-less Difference
USI's core technology consists of patented nozzle-less ultrasonic spray head technology, ideal for the thin, uniform application of a variety of low viscosity materials.

How it Works
The Ultra-Spray head consists of an ultrasonic transducer with a spray forming tip, an ultrasonic generator, an external liquid applicator, a precision liquid delivery system, and air directors. The ultrasonic transducer contains a spray-forming tip that vibrates at an ultrasonic frequency (> 20 kHz). The ultrasonic transducer is resonant at a particular ultrasonic frequency of 35 kHz, 45 kHz, or 60 kHz, and is driven by an ultrasonic generator with a corresponding frequency. The particular ultrasonic frequency is selected based upon the material to be sprayed and the coating application requirements. The amplitude of vibration of the spray-forming tip is also set with the ultrasonic generator.

The coating liquid is delivered to the spray-forming tip on the ultrasonic transducer with an external liquid applicator. The liquid is stored in a reservoir and fed to the liquid applicator with a precision liquid delivery system. The ultrasonic vibrations of the spray-forming tip break up the liquid into small drops and propel them from the tip in the form of a spray. The width of the spray pattern produced is equal to the width of the spray-forming tip (2mm to 20mm depending on head type).

Air directors are used to shape and accelerate the ultrasonically produced spray. The air director impinges a jet of air on the tip of the spray head opposite the liquid feed side. The resulting airflow entrains and expands the spray to produce a flat (rectilinear) pattern up to five (5) times the width of the pattern produced by the ultrasonic energy alone.

CAT ILDS Head and CAT Blade Head
Two spray head types are available: the CAT ILDS Head and the CAT Blade Head. The ILDS head produces a spray pattern width in the range of 3mm to 25mm, while the Blade head produces a spray pattern width up to 210mm. The ILDS head is typically used for smaller substrates and the blade headfor larger substrates.

Since the spray is produced with ultrasonic energy rather than pressure, and because a low velocity air stream is used only to shape the spray, very little coating is wasted due to overspray with a transfer efficiency of 97% to 99%.

• Liquid flow rate
• Air pressure
• Head height
• Head speed