In order to achieve any of the 5 levels of cleaning discussed in designing consideration 1, there are three basic types of cleaning processes that correspond to three levels of spray impact. The three processes require different nozzles, as the properties of the required spray vary.
1. For rinse applications, a low impact and high coverage spray design is necessary since rinsing does not rely on the kinetic energy of the liquid to remove residue. Therefore, full cone spray nozzles are the ideal choice.
2. For wash applications, the impact of the spray helps to remove residue. Full cone spray design nozzles disperse the kinetic energy of the liquid over a large area, reducing the impact. To achieve the necessary impact, other spray designs such as flat fan spray patterns are required. However, this only cleans a narrow line, and some form of relative motion is required to clean a target area. This motion can be provided by a conveyor moving the product under a cleaning spray bar or by a moving spray bar.
3. High impact washing is used to remove stubborn residue. For these applications, only a solid stream spray design is suitable as it delivers the most kinetic energy per unit area (i.e., has the most impact). However, now only a small spot is cleaned, so more refined motion is required. An example of such motion would be an oscillating spray bar targeting a conveyor.