What causes paint to drip and leave streaks? Management of viscosity and paint thickness.
The sagging is determined not by the performance of the paint, but by viscosity, spray distance, and the thickness of a single coat. This explains the key points for management to prevent recurrence in mass production.
Are there any drips left on the painted parts? Even if you sand and fix it, that area will have a different gloss and film thickness. ────────────── ■Cause of Occurrence Drips occur when too much paint is applied at once. This can also happen if the viscosity is too low, the spraying distance is too close, or the gun movement is too slow. ■Truth Around holes and on downward edges are places where paint tends to accumulate. When placed in the oven and the temperature rises, the paint softens and flows further. This is why drips can appear after curing, even if there were none immediately after painting. ■Improvement Measures Measure the viscosity with a viscosity cup each time and record the seconds. Keep the thickness of each coat thin and allow for a setting time before placing it in the oven. Eiwa Kogei supports everything from trial painting to mass production with three systems of equipment. Please download the materials summarizing the confirmation points of the process and make use of them.
basic information
Defect: Dripping. Management items: Paint viscosity, spray distance, gun speed, thickness per coat, setting time, furnace heating.
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Applications/Examples of results
Powder coating of metal parts with many holes and edges, such as automotive parts, industrial machine housings, and steel brackets. Selection of painting subcontractors, quality control training, 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.