Sharp painting technology from Dürr

Picture-perfect (L-R): The EcoPaintJet applicator increases painting efficiency and offers companies more options when it comes to product design. It applies parallel paint jets using a nozzle plate. The precise painting paths enable surface painting and coating with high edge definition.

In almost every industry sector, including woodworking, the number and diversity of work pieces being coated are growing. To be able to paint these diverse components with greater efficiency, Dürr has developed a new technique that applies paints over large areas or in simple patterns with high edge definition – and absolutely no overspray.

Surface coating previously involved a great deal of effort if the coating had to be applied with high-edge definition as the surfaces either need to be manually masked or film-wrapped. There was also a significant amount of waste, both in terms of adhesive tape and paint loss due to overspray.

With the new overspray-free application, both of these challenges are a thing of the past. The EcoPaintJet applicator delivers precise coating and offers companies more options when it comes to product design and the transportation of goods.

Instead of adhesive film, decorative surfaces can be protected for transport through the targeted application of a spray film. This can then be simply pulled off again at the destination.

The technology also enables new options for the function and design of products. The precise coating method means that window frames can have a weather-proof coating applied to the outside and a decorative or differently coloured application on the inside.

Decorative effects can be easily realised on furniture fronts. The most important component in the overspray-free application set is the paint supply combined with the cleaning and pre-painting process.

This is controlled by the EcoPaintJet using three valves. The beating heart of the applicator itself is a nozzle plate that produces several dozen parallel paint jets depending on the design.

They can be activated or deactivated at any given moment to start or interrupt the coating process.

Unlike painting processes involving spray guns or high-speed rotary atomizers, this process does not require any atomized air. The overspray that must be filtered from the booth air in a complex process when using conventional methods therefore does not occur.

Another big difference compared with classic atomizers is that the width of the painting path can be adjusted by means of the applicator’s angle of application. This enables a painting path from 30 to 50 mm in width.

Narrower path widths can also be produced by adapting the nozzle plate. The desired coating thickness is controlled via the applicator speed and solid content of the paint.

The new technology eliminates all the disadvantages of the individual methods and makes painting faster, more cost-efficient, and environmentally friendly in all industry sectors and makes it attractive even in scenarios where an automated painting method was not previously conceivable.

Together with Dürr, the Austrian paint manufacturer Adler is promoting the new application technology by developing colourless and pigmented coating solutions that, in addition to the usual paint requirements, are precisely tailored to the special features of this technology.

(Dürr Group has a direct representation in Chennai, since 1997, and Schenck RoTec (Noida), since 1986.)

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