The OZPEN is a versatile, precision, small surface area cleaning system for critical fiber optics and other manufacturing operations. The OZPEN generates and propels an adjustable spray of clean dry air or nitrogen containing small CO2 particles to efficiently remove foreign matter from a surface.
The OZPEN replaces or augments conventional solvent-aided wiping cleaning techniques which can spread, smear or shed, or redeposit trace residues and particles over critical surfaces.
The composite spray cleaning technique is a patented process where one can deliver controlled shear stress on surface contaminants using chemically active, dry CO2 spray for efficient and effective removal of inorganic and organic surface contamination from critical substrate surfaces.
The cleaning unit delivers a precisely controlled accelerated stream of solid carbon dioxide particles (i.e. snow) at high velocity. The snow is created from the conversion of liquid CO2 to solid CO2 particles and CO2 gas at the spray nozzle. The nozzle, propellant pressure, and temperature are adjusted for optimal cleaning process.
The main method for removal of particulate and other loosely bound contaminants is momentum transfer. In this process, an incoming CO2 particle strikes a particle on the surface. The resulting force overcomes the force holding the particle to the surface, and the CO2 gas spray/propellant plume then carries the particle away. This unique dry process can remove very small particles (< 100 nm in size) without the need for using other wet cleaning techniques.
Note: Embedded debris must be cleaned or loosened by means of ultrasonic cleaning prior to cleaning with CO2.
Thin film organic contamination may also be removed by CO2 composite snow cleaning. To remove organic species they must be soluble in liquid CO2. Typical light oils are good candidates for CO2 cleaning.
Solid CO2 spray within the spray plume exists at temperature of approx. -78 °C. The cooling properties of CO2 can be used to remove contaminant with high water content, first by freezing then by fracturing it from the underlying substrate.
Each OZPEN is equipped with a flexible coaxial tube, spray pen applicator, and foot switch. The basic system provides precision cleaning capability right out of the box and includes all components for precision cleaning apart from the process gases.