If you split open the bulge and look inside, you will understand the cause. This explains how to distinguish between three patterns: water, rust, and cavities, as well as points to reconsider in the process to prevent recurrence.
Even after repainting, the same area swells up again. Please cut open the swelling once and take a look inside. 【First, please look here】 □ The inside is damp and water is coming out → Moisture and salt from the pre-treatment remain □ The inside is brown and rusty → Rust from before painting or rust spreading from scratches in the substrate □ The inside is dry and only hollow → Gases or solvents inside the material have not fully escaped 【Why does it keep happening?】 Simply repainting from the top leaves the cause of the swelling still underneath the paint film. If you take measures without checking the contents, it won't stop even if you change the paint. 【Countermeasures you can take starting today】 1. Break three swollen parts and record the contents 2. If it's water, wash and dry; if it's rust, remove the rust; if it's hollow, review the drying process 3. Compare the number of swellings in three batches after the countermeasures 【Free materials】 You can download a guide summarizing how to identify and address painting troubles for free from the related catalog on this page. Eiwa Kogei handles everything from paint stripping to pre-treatment and repainting.
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Defect type: Blistering. Identification method: Moisture, rust, and cavities inside the blister. Management items: Washing and drying, rust removal, material preheating, comparison of lots after countermeasures.
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Investigation into the cause of recurring blisters in metal parts. Quality assurance department's defect analysis, countermeasure meeting with the painting subcontractor, training materials for new employees.
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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.
