The paint film cracks due to bending and temperature changes. Thickening and over-baking take away flexibility. It can be prevented by optimizing film thickness and baking conditions.
Bending during assembly and temperature changes in winter cause fine cracks in the paint film. This is not an issue of the paint's flexibility, but rather a problem with the application method and curing process. When the film thickness exceeds 60 microns, the crack occurrence rate skyrockets. ────────────── ■ Causes of Occurrence Thick paint films cannot keep up with the expansion and contraction of the material, leading to cracking due to internal stress. If the curing is excessive, the resin's cross-linking progresses too far, making it hard and brittle. ■ The Truth The thick coating intended to prevent defects is causing further defects. There are many cases where increasing the film thickness for rust prevention results in a high incidence of cracks. ■ Improvement Measures Design the film thickness to be 30-50 microns according to the material and application. Keep the curing temperature and time within the paint specifications, and manage the temperature difference in the oven to within 10 degrees. Please utilize the materials that summarize the management standards for film thickness design and curing conditions.
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basic information
Corresponding materials: Iron / Stainless steel / Aluminum / Aluminum die casting / Zinc die casting / Film thickness design: 30-50 microns (adjustable according to application) / Baking management: Temperature difference within 10 degrees in the furnace / Support for test painting, film thickness measurement, and adhesion testing / ISO 9001 certification obtained.
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Applications/Examples of results
Parts that undergo bending processes after sheet metal processing, outdoor installation equipment, construction hardware, automotive parts, industrial machine covers. Preliminary verification with test painting is also possible.
Company information
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.
