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Finishing News

Dürr Develops Automated Application Solution for Precise Paint Application

automotive coating technology
August 23, 2019

SOUTHFIELD, MI – With its EcoPaintJet system, Dürr has developed an automated application solution that ensures an unprecedented level of precision in applying sharp paint lines. The EcoPaintJet also offers important benefits in the painting of electric cars. Dürr introduced the solution to the public for the first time during an open house that took place at the company's headquarters in Bietigheim-Bissingen, Germany.

Dr. Jochen Weyrauch, CEO of Dürr Systems AG, said, “The EcoPaintJet is a quantum leap in the journey toward the efficient, two-tone painting of cars. It is the first system to efficiently combine customized product design with automated production.”

When only one type of paint is applied, the efficiency of modern automotive paint shops is unrivaled. Due to their highly automated processes, large plants paint 300,000 car bodies per year while maintaining a consistently high level of quality. However, adding a contrasting or accent color, for example on the roof or as a design strip, means a considerable amount of extra work. Once the entire car body has been painted in the basic color, which has then dried and cooled, masking tape must be applied by hand – except for the areas due to be painted in a different color. Then the car body goes back to the painting line, where the second color is applied. After more cooling and drying, the tape must be removed, once again by hand. This is not only associated with high labor costs, but the energy consumption for the curing of paint increases by at least 25% compared to single-color painting. In addition, six to 15 square meters of masking tape must be disposed of per car body. Moreover, the painting line is blocked by the second paint application, which wastes valuable production time.

Dürr’s new process, known as EcoPaintJet, is much more efficient, as it dispenses with the need for masking the car body. This is due to a totally new applicator. Fixed to a robot arm, it moves over the target area and applies paint with razor-sharp lines. The paint lands exactly on the intended areas and nowhere else – not even the tiniest amounts. As a result, the rest of the car body no longer has to be masked. It only takes a cycle time of 120 seconds to apply a contrasting color to a car body roof. By comparison: when using masking tape, the time required to put on and remove the masking tape alone is about 50 minutes.

EcoPaintJet helps electric car manufacturers fulfill an important customer requirement. Some e-cars are built slightly higher than conventional models, since the battery is installed in the floor assembly, under the passenger compartment. Many buyers, however, would like their cars to look low-slung and sporty. To get this effect, a dark contrasting color is used to paint a strip between the roof and side wall, as well as on the rocker panel, which makes the car look flatter. The EcoPaintJet is perfectly suited to this purpose, as it applies the strip precisely without compromising the existing finish.

The EcoPaintJet achieves its high level of precision because the applicator does not generate any overspray. Overspray refers to fine droplets of paint that land outside the target area. The EcoPaintJet has a precisely machined nozzle plate, measuring only a few square centimeters, which prevents the formation of overspray. The nozzle plate, which forms the underside of the rectangular applicator, has about 50 hardly visible holes with a diameter of approximately one-tenth of a millimeter. They are used to apply paint to the car body surface in parallel jets from a distance of 30 millimeters.

The applicator is the centerpiece of the intricately designed EcoPaintJet system. This also includes the EcoRPL 133i painting robot, which moves the applicator without any vibration. A measuring system, equipped with sensors, provides maximum precision. It takes a 3D measurement of the area to be painted and sends the data to the control software. This continuously calculates along which path the applicator must be moved over the surface to achieve an optimum paint finish – this is called automatic path generation. It also determines how the applicator must turn, plus the speed required to apply exactly the right amount of paint.

According to Dr. Lars Friedrich, responsible for application technology on the Dürr Systems AG Board of Management, “This high-tech process enables the automotive industry to fulfill customers’ specific requirements faster while ensuring top quality. There is great interest in the market, as we are offering real added value with this new technology.”

The EcoPaintJet is currently being tested at several carmakers’ sites. In the meantime, Dürr is already working on a further development of the technology, which can also paint more complex geometries. This enhanced version, known as EcoPaintJet Pro, enables each hole in the nozzle plate to be opened and closed individually. This offers even more possibilities for product customization. In the future, the automatic application of lettering and logos should also be possible – similar to a digital printer.

KEYWORDS: automotive coating systems paint application technology

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