The cause of blisters is the volatilization and gasification of oils. The simultaneous removal of moisture and oils from the material is the key point for countermeasures.
Blistering is a defect where the paint film swells during the cooling stage after baking, creating cavities between the paint film and the substrate. Once it occurs, the paint film peels off due to temperature changes in the usage environment, resulting in a high complaint rate after delivery, second only to paint peeling (industry average: 15-20 percent). The risk of double gasification: At a baking temperature of around 150 degrees, residual oil vaporizes, and moisture absorbed by the substrate turns into steam. When these two gases are generated simultaneously, pressure increases under the paint film, and there is data showing that the blistering rate can reach 85 percent. Optimal temperature for degreasing solution: Keeping the degreasing solution above 50 degrees improves oil removal efficiency by 60 percent. Additionally, moisture after chemical treatment can be removed by 95 percent with heating and drying at 80 degrees for 3 minutes. Response to stainless steel materials: Stainless steel absorbs more moisture on its surface than aluminum (1.5 times more), making it incompatible with conventional conditions. It is essential to set pre-treatment conditions specific to each material. Our company has established optimal degreasing and drying conditions for each material, achieving zero blistering.
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basic information
De-fatting liquid management, chemical treatment, drying process, material-specific conditions.
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Applications/Examples of results
Blister prevention, quality stabilization
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.
