The appearance of stripes and mottling in metallic paint is due to the uneven arrangement of aluminum particles. This explains the management of the overlap width and distance during spraying.
The metallic paint shows a striped pattern depending on how the light hits it. Although it is not noticeable from the front, it becomes a prominent defect when viewed from an angle. 【First, please look here】 □ The stripes align with the direction of the spray gun's movement → The overlap of the spray is insufficient □ The edges of the parts are darker in color → The spray distance is too far, causing dry particles to settle □ The brightness varies from part to part → The speed of the spray gun differs depending on the painter 【Why does this happen?】 The metallic shine is produced when aluminum particles in the paint film are aligned flat. If the application method is inconsistent, the orientation of the aluminum particles changes from place to place, resulting in a striped appearance. 【Countermeasures that can be implemented starting today】 1. Set the overlap width to more than half and ensure everyone is consistent 2. Confirm the spray distance and gun speed using a test spray board 3. Conduct inspections from both the front and at an angle 【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 can proceed to mass production after confirming the finish with testing equipment.
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basic information
Defect target: Metallic stripes and mottling. Management items: Overlap width of spraying, spraying distance, gun speed, test painting board, appearance inspection from two directions.
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Metallic painted exterior parts, covers for home appliances and machinery. Development of appearance standards by the quality control department, skill training for painters, training materials for new employees.
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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.
