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Metal Industry and Professional Education Cluster

Electrostatic Powder Coating

Electrostatic powder coating

Powder coating, sintering is one of the most common surface treatment methods in the metal industry, machine industry. In the process, a coloured plastic powder lacquer is applied to the work piece which is then melted onto the surface in an oven at 160 to 200 degrees Celsius. The surface crosslinked in this way is extraordinarily long-lasting, flexible and heat-resistant, enabling precise, fast surface protection for the metallic materials.

In the process of industrial powder coating the application of the powdered lacquers to the surfaces of the work piece to be treated is generally electrostatic. The lacquer, usually made on polyester or epoxy-polyester basis, is electrostatically charged during surface treatment and the work piece is grounded. As a result of the difference in charge developed, the metallic working piece attracts the powder particles some of which remain adherent to the surface; and the final bonding takes place in the oven.  

The electrostatic powder coating has several advantages:

■ No use of solvent, environmentally friendly
■ Closed technology, no leakage of pollutants
■ Specifically one of the cheap methods
■ Large areas can be coated quickly without drying
■ It can be used immediately after oven treatment, can immediately be stacked and packaged
■ The surface is very resistant to UV radiation, weatherproof
■ Several decades of industrial experience are behind the powder coating process

For 25 years, we treat the surface of our metal products with the electrostatic powder coating process!

Flow of electrostatic powder coating 

Flow of electrostatic powder coating

The first and most essential step in powder coating technology is the appropriate cleaning, degreasing, preparation of the surface, which is indispensable for permanent surface treatment. The surface preparation takes place in our factories or with the support of our partners by means of galvanizing or sandblasting, as required.

Onto the cleaned and grounded metal surface, with the use of a special powder spray gun a plastic-base powder coating is applied; it adheres uniformly to the surface due to the static charge.

In air-circulated furnaces the applied powder-coat is melted onto the metal surface of the work piece in a temperature range of 160-200 °C during the heat treatment of 15-20 minutes, thereby the surface treatment material reaches its final “state” on the surface. 

What kind of surfaces can be achieved by powder coating?

With the electrostatic powder coating, almost all colours of the RAL colour scale can be achieved in the following variants:

By feature: a) outside, b) inside
By brilliance: a) mat, b.) silky, c) shiny
By surface: a) smooth, b) finely structured, c) structured (hammered)

The surface film produced is generally 60-150 microns thick, but in other methods, the applied powder protective layer on the surface may be increased to a thickness of 250 microns, if necessary.

The characteristics of our electrostatic powder coating service:

Oven type: BT-40 E-JET
Spray gun: Type SAMES
Colour thickness: 60-150 micron layer thickness
Capacity in a shift: 500 m²/shift
Physical dimensions of the burning oven: 4000 × 1400 × 2400 mm (length×width×height)
Oven load: 100 kg/m weight load

  

For further details please contact our colleagues, and ask for our offer!



 

Jozsef Klenovszky

Production manager of metalworking shop and powder coating work
Offers, production processes, technological questions

Mobile phone: +36 20/5530-403
Phone: +36 96/517-225
Fax: +36 96/517-226
Email: lakatosuzem@ferenczifemipar.hu