Airless spraying is a spraying method (a method of applying coatings, which allows to obtain a high-quality film) in which the coating is applied by dispersing the flow of paints and varnishes ( LKM ), which is achieved due to a sharp drop in pressure when leaving a special form nozzle from 200-250 atm ( up to 500 atm) to atmospheric pressure. In this method, air is involved as a braking medium, which reduces the flow rate of the aerosol and allows it to lie gently on the surface to be painted. The features of the torch formed by airless spray equipment include a sharp boundary of the edges of the spot and a high uniformity of droplets in size.
For airless paint spraying, special high-pressure painting equipment is used, consisting of a pump forcing paint (up to 200-500 atm), high-pressure hoses, airless spray guns and airless spray nozzles .
This technology has two main advantages: the almost complete absence of fog and a very high productivity of painting work in comparison with air and combined spraying (pneumatic spray gun). But there is a very significant drawback: the decorative surface quality of the resulting paint film is 3-4 times worse than with pneumatic spraying . It should also be noted that it is very difficult to obtain a standard wet film thickness of 80-100 microns, especially with manual spraying . [one]
Typically, airless spray painting equipment is used to work with building paints and soils when painting large areas of a flat shape, or for industrial painting that does not require good coating quality: for example, railroad cars. The method of airless spraying with corrosion protection is widely used - the application of industrial coatings . LKM sprays a painter - an anticorrosion agent .
Content
Benefits
- lower product loss
- excellent transfer efficiency
- higher speed
- more autonomy in the work of the operator
- low solvent consumption
- great for thixotropic varnishes
- easy to use gun
- better ecology due to reduced solvent vapor
Weaknesses
- not perfect aesthetic effect
- expensive equipment
- laborious maintenance and flushing
- loss of product due to hang up
- expensive nozzles
- pre-atomization devices required
Notes
- ↑ Guidelines for the training of inspectors on visual and measuring quality control of paint work ”/ Ch. ed. Pirogov V.D .. - Yekaterinburg: Publishing House "Origami", 2009. - 202 p. - ISBN 978-5-9901098-1-5 .
Links
- Pocket Guide of the Corrosion Corruption / Kozlov D.Yu .. - Yekaterinburg: LLC ID Origami, 2008. - 264 p. - 1000 copies. - ISBN 978-5-904137-01-4 .