Ultrasound-Operated Nozzle Features 13-µm Drop Size

Suited for use in precision coating applications, a 180-kHz ultrasonic atomizing nozzle with a characteristic median drop size of 13 µm has been developed by Sono-Tek (Milton, NY, USA). The device will be officially introduced next month at the MD&M West trade show and conference, which returns to the Anaheim Convention Centre in Anaheim, CA, USA, on 10 to 12 February.

High-frequency sound vibrations are used to excite piezoelectric transducers inside the nozzle body to atomize the liquid. An electrical signal is fed into two electrodes sandwiched between the piezoelectric transducers, creating continuous vibrations down the nozzle’s titanium horn. This converts the liquid into a uniform spray of atomized droplets that coat the surface.

Solvents such as THF, acetone, DMAC, toluene, and chloroform as well as urethanes, polycarbonates, silicones, styrenes and other polymers can be atomized using this device. The low-velocity spray and uniform small droplet sizes that can be achieved make the nozzle suitable for applying thin-film coatings to devices with complex geometries such as implantable stents, without any overspray or webbing of the polymer.

The durable and chemical-resistant nozzles are made from titanium and stainless steel. The combination of ultrasound technology and a comparatively large liquid-feed orifice virtually eliminates clogging, according to the manufacturer.

Tags: medical device coating equipment, Sono-Tek, ultrasound nozzle

Posted in medtechinsider, surface treatment