Invisible swelling defects at the time of shipment can lead to complaints a month later. Managing moisture beneath the coating is important.
Blisters are troublesome because defects that were not visible at the time of shipment can appear later. A few weeks or a month after delivery, the paint film may swell, leading to complaints from customers. The main causes are three factors: moisture, oil, and rust particles remaining in the substrate. When moisture or foreign substances remain under the paint film, they expand over time, pushing up the paint film. Particularly, edges, welds, and bag-shaped parts tend to retain moisture, making it difficult to detect initial abnormalities through visual inspection alone. In the initial response, we check the diameter of the swelling, the number of occurrences, and the condition of the substrate after removing the paint film. Countermeasures include confirming drying after pretreatment, managing storage time before painting, checking curing conditions, and verifying the film thickness at the edges. Since blisters are also related to rust recurrence and peeling, not viewing swelling in isolation contributes to preventing recurrence. Please utilize pretreatment confirmation materials for investigation. By not just crushing the blisters but also checking the condition beneath the paint film, we can achieve permanent measures rather than mere cosmetic fixes.
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basic information
Blister prevention, paint film swelling, moisture retention, poor adhesion, pre-treatment management, metal coating.
Price range
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Applications/Examples of results
Improvement of blistering in automotive parts, construction hardware, industrial machinery, and metal products, as well as measures against paint film blistering.
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.
