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CED Coating Line

CED process is industrially used for applying coatings to metal fabricated products. It has been widely used to coat automobile bodies and parts, tractors and heavy equipment, electrical switch gear, appliances, metal furniture, beverage containers, fasteners, and many other industrial products.

The first patent for a cathodic ED product was issued in 1965 and assigned to BASF AG. PPG Industries, Inc. was the first to introduce commercially cathodic EPD in 1970. The first cathodic EPD use in the automotive industry was in 1975. Today, around 70% of the volume of EPD in use in the world today is the cathodic EPD type, largely due to the high usage of the technology in the automotive industry. It is probably the best system ever developed and has resulted in great extension of body life in the automotive industry

In short ED method is one of the most efficient methods for primer coating suitable for large volume production for coating complex form items, or where high corrosion resistant coating is required.

Paint material utilisation is approaching 95 to 99%. Corrosion resistance measured in salt spray is excellent and no other painting method can compete with ED method in primer coating.

For all these reasons ED painting is indispensable technology which all industrialized countries must master.

On the other hand ED painting requires more technically competent operators than other painting methods do and it is sometime seen that a whole investment of ED painting line is abandoned after a trouble infested operation continued many months unsuccessfully and finally the owner changes to other methods.

Strong points of ED methods

  • Suitable for coating form / shape articles.
  • Excellent edge covering
  • Utilisation of coating material is more than 95%
  • Environmentally friendly. Along with powder coating, the method is one of a few technologies to meet VOC emission standards.
  • Economically for large volume coating.

The overall industrial process of CED consists of following processes:

The surface of part to be coated needs to be prepared for coating. This normally consists of some kind of cleaning process and include the application of a conversion coating, typically an inorganic phosphate coating followed by coating process itself. This normally involves submerging the part into a container or vessel which holds the coating bath or solution and applying direct current electricity through the EPD bath using electrodes. Typically voltages of 25 - 400 volts DC are used in electrophoretic painting applications. The part to be coated is one of the electrodes, and a set of "counter-electrodes" are used to complete the circuit.

After deposition, the object is normally rinsed to remove the undeposited bath. The rinsing process may utilize an ultrafilter to dewater a portion of the bath from the coating vessel to be used as rinse material. If an ultrafilter is used, all of the rinsed off materials can be returned to the coating vessel, allowing for high utilization efficiency of the coating materials, as well as reducing the amount of waste discharged into the environment.

A baking or curing process is normally used following the rinse. This will crosslink the polymer and allows the coating, which will be porous due to the evolution of gas during the deposition process, to flow out and become smooth and continuous.

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