18 Sep 2010
Sono-Tek Corporation is currently highlighting their ultrasonic coating equipment, including a high-speed ultrasonic reciprocating coating system, HyperSonic. The HyperSonic system is designed to coat large area solar glass (up to 122cm) with uniform, thin-film anti-reflective coatings. Sono-Tek’s ultrasonic coating technology applies an optimum anti-reflective layer, maximizing the light available for conversion and increasing transmission over the sun’s incident angles. Traditional CVD and PVD for solar glass coatings are expensive, slow batch manufacturing processes. Pressure nozzles are capable of spraying anti-reflective suspensions; however, they have critical process limitations. Significant overspray and clogging, along with poor deposition control and inconsistent uniformity are major drawbacks to pressure nozzle technology.
Sono-Tek’s ultrasonic nozzles are able to overcome these limitations with minimal bounceback and overspray, non-clogging performance, and uniform thin-film coatings. The benefits of ultrasonic coating include the ability to control thickness of deposition, drop size control (by varying nozzle frequency), and tight drop distribution resulting in precise, uniform deposition. Ultrasonic nozzles are ideal for spraying nanosuspensions, commonly used in anti-reflection coatings, as the continuous ultrasonic vibration of the nozzle deagglomerates particles and keeps them evenly suspended in solution.