Although the CO_2 blast cleaning process can solve many cleaning cleaning needs at this time, there is still much work to be done to understand the actual surface cleaning mechanics. Although much progress has been made, there are still many unknowns. The level of Understanding for dry ice must equal that of abrasive grit where there is a quantification of Results of size, hardness, density, substrate material, velocity, etc. This quest for knowledge is hampered by the uniqueness of the media being used. Unlike grit, the pellet is not in a static condition that can be leisurely measured; it begins to disappear as soon a sit is formed. The pellets also undergo changes during transport and acceleration, which means that the pellet measurement at the pelletizer may not be representative of the particles striking the substrate. Because the small dry ice particles are moving so fast and within a cloud vapor, it is difficult to accurately measure what is exiting from the cleaning nozzle.
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