The cause of the dripping is the mismatch between paint viscosity and curing temperature. It explains the phenomenon where a 20-degree difference results in a threefold increase in occurrence rate.
Dripping occurs due to poor coating film, which not only leads to appearance defects but also induces poor curing in thick film areas. On average, it accounts for 8-12 percent of all painting defects in the industry. Relationship between viscosity and curing temperature: The lower the paint viscosity and the higher the curing temperature, the more likely dripping occurs. Even with the same viscosity of paint, simply raising the curing temperature from 160 degrees to 180 degrees can increase the dripping occurrence rate from 20 percent to 60 percent. Response to seasonal variations: The viscosity of paint can change by up to 40 percent between winter (5 degrees) and summer (25 degrees). Without proper viscosity management, the defect patterns will vary with each season, making it difficult to identify the causes. Optimal viscosity by material: Aluminum die casting has an optimal viscosity of 20 seconds (Ford cup), zinc die casting 18 seconds, and stainless steel 22 seconds. It is necessary to address the differences in surface tension by material. Our company has implemented daily management using a viscometer and an automatic adjustment system based on material and season, keeping the dripping occurrence rate below 2 percent.
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basic information
Viscosity management, temperature management, material-specific settings, seasonal adjustments.
Price range
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Applications/Examples of results
Prevent dripping, improve appearance quality.
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.
