What is the reason for the inability to coat recesses in powder coating? The barrier of static electricity.
Only the inner sides of the box and the bottoms of the deep ribs do not have a film thickness. I will explain the Faraday cage phenomenon that prevents static electricity from entering and the countermeasures.
Only the inside of the box and the bottom of deep ribs do not receive powder no matter how much is blown. This is not a problem with the gun; it is caused by the nature of static electricity. When the depth of the recess exceeds 1.5 times its width, the powder cannot reach it. ────────────── ■ Cause of occurrence Electric field lines concentrate at the corners of the entrance of the recess and do not penetrate inside. Charged powder is attracted to the corners, leaving the back uncoated. ■ Truth Increasing the voltage has the opposite effect. At high voltage, adhesion at the entrance increases, further hindering access to the interior. ■ Improvement measures Lower the voltage and increase the air pressure to mechanically push the powder in. Depending on the shape, switching to solvent-based powder coating is reliable, and preliminary test coatings are effective. Please utilize the materials summarizing suitable shapes for powder coating.
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Corresponding materials: Iron / Stainless steel / Aluminum / Aluminum die casting / Zinc die casting / Coating methods: Powder coating and solvent-based baked coating selected according to shape / Test coating support / From single small lots to mass production / ISO 9001 certification obtained.
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Powder coating for control panel enclosures, machine covers, ribbed structural components, frames, playground equipment, etc. We also offer suggestions for differentiating between powder coating and solvent-based baked coatings.
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We are not just a "subcontracted painting factory." Established in 1958, our company has a foundation of painting technology and also specializes in chemical treatment, stripping, and cleaning, functioning as the "external surface treatment department" in your organizational chart. Based on our philosophy of "preparation is eight-tenths of the work," we emphasize participation from the "upstream process" before the drawings are finalized. We conduct test painting on a wide range of metals and difficult materials, and we produce the entire process from assembly, packaging, to delivery, thereby reducing your management workload. Additionally, by being able to perform zinc phosphate treatment in-house, we achieve stable painting quality. Furthermore, our micro-heating stripping technology, which does not use chemicals, maintains the electrical state of the "jigs (hangers)" that influence painting quality. Our approach of "pre-treatment determines painting quality" ensures the stability of the paint film during mass production. Rather than simply "applying specified standards," we work backwards to achieve optimal painting specifications and prevent scratches during transportation, sparing no effort in thorough discussions from the outset. This diligent preparation is the shortest path to preventing rework and minimizing total costs. From the development stage, please utilize the expertise of our specialists as part of your production line.
