What causes a painted surface to have a citrus peel texture and lack gloss? Spraying conditions.
The painted surface is uneven like an orange peel, and the gloss is blurred. The cause is the balance of the paint's viscosity, spray distance, and air pressure.
The painted surface is uneven like an orange peel, and light does not reflect off it. In exterior parts, this orange peel texture alone can lead to rejection. ────────────── ■ Cause of Occurrence Orange peel occurs when the paint begins to dry before it spreads out evenly. The main causes are too high viscosity, too far a spraying distance, and low air pressure resulting in coarse mist. ■ Truth When thinner is saved and viscosity is increased, orange peel increases significantly. On hot days, drying occurs quickly, making it easier for unevenness to appear even under the same conditions. ■ Improvement Measures Viscosity should be measured with a viscosity cup, and a standard number of seconds should be established for each season. The spraying distance and air pressure should be standardized for each painter, and the condition of the surface should be checked with a test panel. Allow for a setup time before entering the oven to ensure the paint has time to spread evenly. Eiwa Kogei supports baked painting of exterior parts from small lots to mass production. Please download the materials summarizing the confirmation points in the process for your use.
basic information
Defect target: Yuzu skin (orange peel). Management items: paint viscosity, spray distance, air pressure, temperature, setting time, test painting board.
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Applications/Examples of results
Powder coating for machine covers, panels, and automotive parts where appearance quality is required. Development of appearance standards by the quality control department, selection of painting subcontractors, 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.