Countless small bubbles that appear after firing. The occurrence of pits caused by trapped solvent can be prevented by adjusting the setting time and heating rate.
After removing from the oven, there are countless small bubbles on the painted surface. Before blaming the paint, please check the time before it was placed in the oven. Many issues arise from a lack of 3 minutes of setting time. ────────────── ■Cause of Occurrence When solvents enter high temperatures before fully evaporating, they vaporize and expand within the paint film. The trapped solvents break through the surface, creating bubble-like holes. ■Truth The combination of thick application and rapid temperature rise is the most dangerous. When the film thickness exceeds 40 microns, the surface hardens before the internal solvents can escape. ■Improvement Measures Ensure a setting time of 5-10 minutes after painting and gradually increase the temperature in the oven. Keep the film thickness below 30 microns in one application, and if necessary, apply in two layers. Please utilize the materials summarizing the management standards for film thickness and curing conditions.
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basic information
Corresponding materials: Iron / Stainless steel / Aluminum / Aluminum die-cast / Zinc die-cast / Setting management: 5-10 minutes after painting / Film thickness management: 30 microns or less for one coat; thick film support for multiple layers / Monthly production of 300,000 units, 100 types, 30 colors / ISO 9001 certification obtained.
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Applications/Examples of results
Thick film coating for industrial machine covers, construction machinery parts, automotive parts, playground equipment, and building materials hardware. Thick film application using a two-coat split 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.
