Practical Advice

Practical Advice

Practical Advice

Practical advice on painting technology and SATA products.

Installation

Which nozzle system is the most suitable for me?

Depending on the area of application and the material to be processed, the paint manufacturer (material manufacturer) will provide a recommendation. These can be found in the technical data sheet. 

A range of available nozzles and coating technologies (e.g. HVLP or optimised high pressure) are often named.

In our data sheets you will find a large number of material manufacturers with their respective recommendations.

How do I adjust my spray gun before painting?

SATA spray guns are ready for immediate use right out of the box.

The recommended input flow pressure for the material used can be found in the technical data sheet of the paint manufacturer (material manufacturer). 
Depending on the specific requirements, the input flow pressure, the spray fan shape and the amount of material can be adjusted on the spray gun. This should be done in the following order:

  1. Adjustment of the jet shape via round and wide jet regulation
  2. Setting material quantity via material quantity regulation
  3. Adjustment of input flow pressure via the air micrometer

Which spray distance is ideal for painting?

When using HVLP spray guns, the spray distance should be approx. 10-15 cm; when using RP spray guns, it should be 17-21 cm. This can vary depending on application speed, nozzle size and the material used.

Cleaning, Maintenance and Care

Which cleaning product is suitable for my spray gun?

For each (paint) material used, the paint manufacturer recommends a specific cleaning medium so that it can be dissolved and does not trigger any undesired reactions (e.g. flakes). 

The following items are important for use in combination with spray guns:

  1. Aqueous cleaning products should have a pH value of 6-8
  2. Acids or lyes may not be used for cleaning
  3. Spray guns or nozzle sets should not be “soaked” in cleaning solution
  4. After cleaning, the spray gun should always be dried (e.g. with a blow gun).

Why does SATA only provide nozzle sets instead of individual nozzle parts?

Depending on duration and frequency of use, materials used and the care of the nozzle set, wear and tear occurs in small steps that are not apparent to the naked eye. The naked eye is unable to discern which of the components is most affected by this. 

That is why it makes no sense to exchange only one of the nozzle elements, as this would quite probably only result in another poor spray pattern. In the long term, this means that the paint nozzle, paint needle and air nozzle are generally in different states of wear and tear, which means that a pending change would not be detected. It would thus not be possible to achieve a spray pattern identical to the one that the spray gun provided in its initial delivery state.

What effect does a worn nozzle set have on the painting result?

Once a nozzle set is worn, the ratio of escaping material quantity no longer corresponds to the atomising air. This means that the intended air volume no longer sufficiently atomises the increased material output, which in turn results in a poor spray pattern and degraded painting results. 

The following faulty patterns could occur:

  • Cloud formation in the base coat (for metallic and pearlescent colours)
  • Orange-peel effect (clear varnish)
  • Darker colour (for metallic and pearlescent colours)

What do I need to keep in mind when assembling and disassembling the nozzle set?

The nozzle set's wear mainly occurs on the parts that have material flowing through them namely the paint nozzle and paint needle. 
Because of the material flow, the material in the paint channel "rubs" against the paint nozzle and needle and thus causes wear. The wear of the nozzle parts varies according to the type and composition of the material and the duration of use.

When cleaning the spray gun and disassembling the nozzle set, care should be taken to ensure that the needle is not mounted while unscrewing the paint nozzle, since the paint nozzle rubs against the paint needle because of the rotational movement, thus causing artificial wear. 

These fundamental principles apply...

...during disassembly:

  1. Remove paint needle
  2. Remove air nozzle
  3. Remove paint nozzle

...during assembly:

  1. Mount paint nozzle
  2. Mount air nozzle
  3. Mount paint needle

Compressed Air Technology / Compressed Air Processing

What should I keep in mind when buying an air hose?

The air hose is the flexible arm of the compressed air system and is very important for a perfect painting result. It should be antistatic (DIN EN 1953), free of paint-disturbing substances, solvent-resistant, flexible and pressure-resistant as well as have a sufficient inner diameter.

"Cheap" air hoses for domestic use (e.g. garden hose) are unsuitable for professional use in a paint shop due to the lack of antistatic properties and the separating agents it contains. 

How often do I need to replace the air hose in the spray booth?

In the workshop, air hoses are sometimes exposed to high temperature fluctuations, solvents or pressure loads (e.g. if a vehicle drives over the air hose).

If used daily, the air hose should be replaced at least once a year.

Which SATA filter do I need if I use water-based paint systems?

When using a water-based paint system, technically absolutely pure compressed air and the use of a three-stage filter (e.g. SATA filter 484 / SATA filter 584) with an integrated activated carbon filter are required.