The reason for the uneven application of the coating was the unevenness of the material. We will unravel the close relationship between the polishing process and painting.
[Cause of Occurrence] In parts made from aluminum die casting or zinc die casting, appearance abnormalities such as orange peel or gloss defects may occur after painting. On-site, it is often thought that there are issues with the air pressure of the spray gun or the amount of coating applied. [Truth] The root of the problem lies in the variation of the "surface roughness" of the material itself. If the roughness from casting defects or shot blasting is uneven, the paint will be absorbed into the recesses, preventing the formation of a uniform film thickness (leveling). This is directly linked to causing dripping defects. [Improvement Measures] In addition to proper surface treatment with the appropriate grit of abrasive material, utilizing the sealing effect of a primer (undercoat) can help maintain a smooth surface. Best practice materials for surface treatment that addresses the surface roughness of die-cast products can be downloaded and referenced here. [Summary] Proper polishing and primer treatment to uniformly adjust the surface roughness of the material are essential for a beautiful appearance finish. Eiwa Kogei Co., Ltd. solves appearance abnormalities with pre-treatment and painting techniques tailored to the characteristics of die-cast products.
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Corresponding materials: Aluminum die casting, zinc die casting / Surface roughness management: Sa 2-3 microns / Pre-treatment: Shot blasting compatible / Film thickness: 30-40 microns / Surface roughness defect rate below 0.5 percent
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Aluminum die casting, zinc die casting, automotive parts
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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.
