Spray Nozzles for Cleaning

Engineering Consideration 2 - Spray Impact

In order to achieve any of the 5 levels of cleaning (discussed in engineering consideration 1) there are 3 basic types of cleaning process representing 3 levels of spray impact.  The 3 processes require different nozzles as the properties of the spray required differ.

1- Rinse applications require a spray pattern that will deliver the rinsing fluid over a large area because rinsing does not rely on the kinetic energy of the fluid to dislodge residue.  As such, a low impact high coverage spray pattern is required.  This means that full cone spray nozzles are ideal.

2- Wash applications rely on the impact of the spray to help dislodge residue.  The full cone spray pattern nozzles distribute the kinetic energy of the fluid being sprayed over a large area and this reduces impact.  So in order to achieve the required impact other spray patterns are required.  Typically a flat fan spray pattern will be used.  The problem is that this only cleans a thin line, so some kind of relative motion will be needed to clean a target area. This motion can be provided by a conveyor moving product under a cleaning spray bar or by a moving spray bar.

3- High impact washing is used to dislodge really stubborn residue.  For these applications only a solid stream spray pattern is appropriate as this delivers the most kinetic energy per unit area (i.e. has the most impact).  The problem is that now only a small dot is cleaned so more sophisticated motion is required.  An example of such motion would be an oscillating spray bar targeting a conveyor.

Cleaning Engineering Considerations

Cleaning Nozzle Designs