Overspray

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In spray applications, overspray or paint mist is the term used to describe the portion of the sprayed material (e.g. paint , insulation or adhesives ) that does not get onto the workpiece, but rather escapes into the environment in the form of spray mist.

description

Overspray is caused by splashing past the workpiece as well as by fine paint droplets flowing off the workpiece surface. The material losses therefore depend both on the workpiece geometry and on the spray technology used and how it is handled. Signs of wear and tear on spray nozzles can also result in increased overspray.

Through assistive techniques, e.g. B. electrostatic processes, and advanced spraying techniques, e.g. B. HVLP technology or viscosity tracking (the regulation of the material flow even when the material viscosity varies ), as well as optical camera systems for live monitoring of the position and quality during application, the proportion of overspray can be significantly reduced. The use of painting robots can also reduce overspray. Automated coating processes enable the overspray to be fed back into the production process.

On the part of the Fraunhofer Institute for Production Engineering and Automation , overspray is considered to be one of the greatest problems in using resources in painting technology, since on average 50% of the paint is not used.

Individual evidence

  1. ↑ a b Christoph Böckmann: Excellent efficiency. In: VDI news . No. 8, February 23, 2018, p. 16.
  2. ↑ VDI 3455: 2013-08 emission reduction; Systems for series painting of automobile bodies (emission control; high-volume car body painting plants). Beuth Verlag, Berlin, p. 8.
  3. ↑ VDI 4075 sheet 2: 2015-08 Production-integrated environmental protection (PIUS); Painting processes (Cleaner production (PIUS); Painting processes). Beuth Verlag, Berlin, p. 9.
  4. ↑ VDI 3455: 2013-08 emission reduction; Systems for series painting of automobile bodies (emission control; high-volume car body painting plants). Beuth Verlag, Berlin, p. 33.
  5. ↑ VDI 3455: 2013-08 emission reduction; Systems for series painting of automobile bodies (emission control; high-volume car body painting plants). Beuth Verlag, Berlin, p. 30.
  6. ↑ VDI 3457: 2016-06 emission reduction; Powder coating (emission control; powder coating). Beuth Verlag, Berlin, p. 20.