The correct selection of the air cap is very important for the spray gun and the spray pattern.
In summary, there are three different air caps as shown in the following table.
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The designation for HVLP Plus is Transtec for DeVilbiss and RP for SATA. Basically, this is a further developed technology between conventional spraying and HVLP application.
The advantages of this further developed HVLP Plus technology for spray guns are, in particular, the following:
- Paint & Solvent Reduction and the associated savings
- Improvement of working conditions
- Better transfer efficiency with at least 65% and less maintenance work, e.g. on the extraction filter
In conjunction with the right spray nozzle selection and the selected suitable air cap , you can achieve the desired painting result. Contact our Beschicht team for application advice.
HVLP stands for high volume low pressure. This means that HVLP spray guns work with a lot of air and low pressure. In this process, the paint is atomised at the air cap of the spray gun with a maximum of 0.7 bar internal nozzle pressure. This results in less spray mist with HVLP spray guns and a significant improvement in the spray pattern. Due to too much "overspray" with spray guns, the spray pattern can deteriorate significantly.
The advantages of the HVLP method over conventional spray methods are that it is more environmentally friendly and cost-effective, as less paint ends up in the environment and in the air. The material application efficiency with HVLP spray guns is significantly higher as a result. The air volume required for the HVLP spray guns is between 600 and 2000 NI/min.
The disadvantage of HVLP technology is that the spray gun must be held close to the workpiece to be coated and the area performance is relatively low. This has led to the development of the HVLP Plus process, which is an improvement on the existing HVLP technology.
The advantage of this further developed HVLP technology is an even higher transfer efficiency. This means material savings and reduced air consumption. The HVLP Plus technology also results in an even better surface quality. The internal nozzle pressure at the air cap of the spray gun is approx. 1.3 bar. All beschicht. spray guns M1 G, M1 P and A1 are available with an HVLP plus air cap.
In addition to the two methods mentioned, HVLP and HVLP Plus, there is also the conventional method, in which the material is atomised at the air cap of the spray gun at a pressure of 2.5 bar to 4 bar. The air inlet pressure used at the spray gun is between 2.5 and 5 bar in the conventional spray method. Due to the very high pressure, a very fine atomisation is achieved, but with a lot of paint mist and high material consumption.
