Cima sprayers have been designed and built inside the Cima factory in Italy since 1974. Cima sprayers are perfect for vineyard, orchard, and nursery spraying. These sprayers allow for more acres per fill-up, uniform spray, more coverage, and better control of air distribution. They also allow for less chemical run-off, fewer applications, fewer fill-ups, and less maintenance.
“High Volume” system
The “traditional” sprayers use a diaphragm or piston pump to obtain a high water pressure to distribute the chemicals through one or more small diameter outlet/s. The use of a fan permits to “hold up” the water droplets by assisting the distribution of the chemicals over the vegetation. This system is conventionally called “High Volume”.
“Low Volume” sprayer
The CIMA pneumatic sprayers use a system based on the “Venturi tube”; a centrifugal fan generates an intense airflow that passes through the Venturi tube and exits through an adequate throat. The water is introduced, without pressure, into the throat of the Venturi and is sheared into extremely fine and uniform particles. The application of this principle is the essential and binding condition for the construction of pneumatic sprayers.
Let’s compare the 2 methods!
“High Volume” System
With the “High Volume”, 85% of the droplets have a diameter of 300 / 500 microns. This size cannot be reduced, not even increasing the working pressure.
The distribution results in rough and uneven, therefore LESS EFFICACY.
The system based on the “Venturi tube” principle
With the pneumatic Low Volume CIMA Venturi Air sprayers, the distribution generates a water fog with a smaller diameter for the 90% of droplets (usually 100 / 150 microns).
The distribution results in precise and uniform, therefore MORE EFFICACY.
The difference in particle size is extremely important. An equal volume of the water used, allows the pneumatic sprayers to do a distribution significantly larger than the “traditional” sprayers. In other words, CIMA pneumatic sprayers cover the same area of vegetation treated by the “high volume” sprayers but with much less water used, that is with a “low volume” of water.
Droplets coverage on an area
Imagine to cover a given area with water droplets: it is obvious that smaller droplets will cover a bigger surface inside the given area.
From the volume of a 300 microns droplet, we obtain 27 droplets of 100 microns. Even considering that the droplet diameter is the same as its imprint, the covered area moves from 0.07 mm² to 0.21 mm², tripling.
However, if we consider the droplets flattening and the larger efficacy area of action coming from the volatility phenomena of the chemicals, and therefore the diffusion and saturation of the peripheral layer (the so-called “Fleming halo” whose thickness is estimated in about 100 microns), the covered area moves from 0.196 mm² to about 1.91 mm², that means 10 times of increase roughly.