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MTM Meißner Technik Müllenbach GmbH

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Taiwan Machine Tool & Accessory Builders' Association (TMBA)

Robots optimize aluminum coating

In traditional methods, the components are guided through treatment baths using what's known as the lift-step process. Initially, the oxide layer is removed in a strongly alkaline medium. The classic process sequence then requires two rinsing processes. After that, titanium oxide coating is applied in a highly acidic environment. However, this process struggles with so-called drag-out problems, as the two rinsing processes quickly accumulate caustic soda. Therefore, efficient process technology is required, which Meißner Technik Müllenbach can provide. In this alternative and patented process, the parts to be coated are moved through the treatment baths in baskets by a robot. The robot enables significantly higher flexibility in the process sequence. In the alternative process sequence, a post-treatment follows the coating in the first tank. Here, after a strongly acidic treatment, the parts are transferred by the robot into an alkaline environment, resulting in acid-base neutralization. This neutralization process significantly extends the life of the rinse and titanium oxide coating. It thus optimally prepares the parts for coating through a changed composition of the rinsing bath. However, the crucial difference is the use of robots.

Cleaning processes prevent typical problems

Another advantage of the robot is that it can transport the components as if by hand. This makes it easier for the applied liquids to drain off, as the components are held at an angle to the surface of the bath. The liquids thus flow off the component more quickly. In addition, the liquid level in the baths is continuously regulated. This bath management also contributes to extending the lifespan. Efficient bath surface cleaning removes oil and floating particles from the tanks. This prevents potential problems from floating oil sheens on the bath surface and consequently on the coated component surfaces. These features significantly improve the coating process of aluminum parts, specifically the battery trays. The process-relevant immersion tanks are fed from separate storage containers. The medium flows through a filter upon activation. This also leads to longer bath lifespans while maintaining stable process results.

Engineering expertise secures Germany as a location

The process runs largely at room temperature. Only the rinsing and degreasing bath before drying are heated. In doing so, thermal energy is transferred to the component. The energy then stored in the component ensures an efficient drying process. For drying, the medium must be converted from the liquid to the gaseous phase. If part of this drying energy is already provided by the component, the process is more energy-efficient than if only hot air is used. Additionally, in the patented process, waste heat from the plant processes is used for heating the hot baths through heat pumps.

The process from Meißner Technik Müllenbach thus aims for greater sustainability. One advantage is significantly reduced operating costs due to the economical use of energy and coating chemistry. The major challenges of transformation in mobility can thus be mastered through a sophisticated process technology. At the same time, Germany's image as a land of inventors and engineers is maintained and strengthened.