Bumps appear on the blown surface. It may not be a foreign substance but rather the gelation of the paint. I will explain the storage conditions.
Bumps appear on the painted surface. Even with foreign matter countermeasures, they do not decrease. It may be due to gelation on the paint side. ────────────── ■Cause of Occurrence Two-component paints begin to react and increase in viscosity the moment they are mixed. Once the usable time is exceeded, microscopic gels form, resulting in bumps on the paint surface. ■Truth Usable time varies significantly with temperature. In a 30-degree environment, the usable time based on 20 degrees is reduced to nearly half. In summer, material storage areas can exceed 40 degrees during the day, and even unopened cans can deteriorate. ■Improvement Measures Record the mixing time on the can and display the usable time according to the temperature. Store paint in a controlled environment between 5-25 degrees and avoid direct sunlight. Please utilize the management materials for paint storage and usable time.
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Corresponding paints: two-component urethane, epoxy, acrylic, powder / Paint storage temperature: 5-25 degrees / Usable time management: record mixing time, temperature-based standards / Film thickness: 20-40 microns / Filtration: pass through a strainer before painting
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General powder coating using two-component paint for automotive parts, industrial machinery parts, and store fixtures. We have a track record of implementing paint storage conditions and usable time management as a means to identify the causes of product defects.
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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.
