What is the reason for the prominence of objects with only black paint? The pathway for foreign substance intrusion.
Even on the same line, defects in products increase only with black or dark colors. The cause is not the color, but the entry route of foreign substances. This explains how to manage and reduce defects.
While it doesn't matter with white, only the black paint gets disqualified due to blemishes. This defect is more likely to occur with dark colors or high-gloss finishes. ────────────── ■ Cause of Occurrence Blemishes are caused by dust, fibers, or paint residues getting into the paint film. Black or high-gloss surfaces reflect light strongly, making even small foreign objects stand out. ■ Truth Most foreign objects are brought in from outside the painting area. The main entry routes are fibers from work clothes, old paint films attached to hanging fixtures, and clogged mesh from paint strainers. If the airflow in the booth is weak, dust that has settled will fall directly onto the painted surface. ■ Improvement Measures Before painting, blow off the parts with air, and regularly strip and clean the hanging fixtures. Use paint only after passing it through a strainer, and manage the booth's filters according to replacement standards. For black or high-gloss finishes, it is reassuring to have a sample of the acceptable limits for blemishes. Eiwa Kogei can also assist with painting parts that have strict appearance requirements, such as black or high-gloss finishes. Please download the materials summarizing the key points for process verification and utilize them.
basic information
Defect target: Foreign matter (contamination). Management items: Air blow, cleaning of hanging jigs, paint strainer, booth filter replacement, limit samples.
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Applications/Examples of results
Baked coating of black or high-gloss appearance parts, automotive parts, and covers for industrial machinery. Development of appearance inspection standards for the quality control department and 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.