29.05.2013 08:11

Fully automatic and enviromentally friendly paint stripping of skid cross member connection by means of inliner eddy current

Another German OEM has chosen the eddy current paint stripping system for the maintenance of cross member connections of the skids of its E-Coat and painting line. Pursuant to the manufacturing conditions at BMW Leipzig, we suggested the implementation of an inline paint stripping concept.


Coating ON -paint drying and coating
Optimal drying process - from the inside to the outside

Using eddy-current technology, not only can the energy consumption during paint drying be reduced considerably – the easy and compact configuration of the system already allows you to spare money during its acquisition in comparison to normal circulation systems.

During the paint drying with eddy-current developed by Bauer Anlagen, the drying energy is fed to the exact place that it is most effective  – the surface of the workpiece. The surface of the workpiece is heated up within a high-frequency magnetic field in a few seconds to just over  230°C,  causing the solution on them to vaporise and the paint to dry.
Due to the heat generated on the surface of the workpiece, the paint dries from the inside to the outside.

The solution can therefore escape without hindrance and the paint dries much faster Coagulation of the paint surface by external heat is therefore impossible.

Requirements and possibilities

To be able to generate a secondary current flow on the workpiece, it must be electrically conductive. Steel is most suitable.

The physical features of high-frequency magnetic fields require as little distance between the coil and the workpiece as possible, i.e. the workpieces must be as flat as possible or rotationally symmetric. Using the modular system of the surface dryer, both the length and width of the coils can be adjusted as well as to concave and convex shapes. When installed on a handling system, the coils can also run through shapes.

Air and energy consumption lowered

Only electrical current is required. The energy requirement remains low, because only the surface of the workpiece is heated up. The housing and the conveyor are only heated indirectly by the residual heat in the air.

On the strength of past experience, the energy requirement for this air technology is 70% and for heating up it is only 50% in comparison to normal hot-air dryers.


  • No heating up time
  • Fast drying
  • Short cycle times
  • Low operating costs
  • No air conditioning
  • Small, compact systems
  • Very high efficiency


  • Only suitable for flat or rotationally symmetrical components
  • Only suitable for iron and steel


Less and smaller components

It only takes a few seconds to heat up the workpiece to drying temperature. The housing and conveyor are only indirectly heated up; additionally, the air is only slightly above room temperature after absorbing the water. This allows small and simply constructed drying channels.

Due to the fast drying time, the eddy-current drying channel can be designed shorter and narrower. The corresponding air heater, exhaust passage, fuel line and fuel container is not required .

Easy integration

The core technology of eddy-current drying from Bauer Anlagen can be integrated on consultation into the existing design of every system manufacturer.

Enormous savings can be made in both investment and operating costs using the new system technology  – as long as the geometry and material used for the workpieces are suitable for eddy-current cycles are short.

Energy balance:

  • During the heating-up procedure, only the surface is heated by the water; the heat only spreads to the inside of the workpiece once it is already dry.
  • Only the water-absorbing air also takes in the heat
  • The conveyor is only heated slightly after the drying process.
  • The housing also is only heated slightly after the drying process.


  • The eddy-current technology is modular. The complete system is constructed from similar components, depending on the requirements. This results in a series configuration that reduces costs.
  • The total dryer is short and small due to the fast drying cycle.
  • Short conveyor
  • Low space requirements
  • Simple housing