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Thinner powder coatings mean lower material costs. But how thin these layers are, there are no drawbacks. We discussed this and other trends with two powder coating experts
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less material means lower costs. Of course, reducing the film thickness of the coating always seems to be the ideal goal. "Completely co-relevant powder coatings as thin as 20-30 m have been achieved in commercial applications," explains Nigel Sherwing, technical director at Akzo Nobel.
even more possible: "In theory, films can be made thinner than a few microns from powder. However, he saw some challenges. As Allnex Powder Coating Resin Global Marketing Manager Robert Watson did.
powder coatings may have disadvantages
Watson explains: "Lower film thicknesses are more likely to show increased orange peels and also reduce cover, especially in lighter tones and organic pigment coatings. He also sees a risk of reduced protection: "Film thickness reduces the negative impact on edge coverage, resulting in a higher risk of corrosion."
Watson Allnex
Robert Watson is Allnex's global marketing manager for powder coating resins
both experts agree that the demand and treatment of thinner particles is a challenge. Robert Watson, of Allnex, explains: "You have to take into account that you need more fine grinding to reduce the particle size distribution to get a thin powder coating. Nigel Sherwig, of Akzo, added that particles must be fluidized, blocked through pipelines, and can be recycled with spraying and any overspout to improve the economic benefits of customers. These processes become more difficult as particle sizes decrease," he said.
trends in powder coatings
in addition to film thickness, the powder coatings market is also affected by many other trends. Digitization is one of the most important, at least for Nigel Sherwing. "E-commerce, color digitization and digital tools are a key area of development," he said, adding, "We've launched several digital applications in different market segments that support highly accurate color measurement tools that work with mobile software to quickly and accurately select colors on the go." For
Watson, lower and faster curing temperatures are a key trend. Temperatures of 130 degrees C and lower "allow for greater use of temperature-sensitive substrates, whether wood, composites or plastics." This will become increasingly important as innovative material combinations are used in construction and manufacturing. "The two experts also agreed that the need for broad sustainability will affect the development of powder coatings.