The pitfalls of baking drying! The trap of uncured material caused by "only the surface drying."
Even though it is baked at the specified temperature, is the hardness insufficient? The truth about the invisible temperature unevenness occurring inside the drying oven.
[Cause of Occurrence] There is a problem in the curing process after painting where "despite drying at the specified temperature and time, the hardness of the paint film is low, or there is a lingering solvent smell." This issue occurs frequently, especially with thick automotive parts. [Truth] Even if the displayed temperature in the drying oven is 180 degrees, the actual "product temperature" of the metal parts may not reach that level, which is the main cause. Thick parts have a large heat capacity, causing only the surface to dry rapidly while the internal solvent does not fully escape, leading to an uncured state that can induce pinholes. [Improvement Measures] It is essential to regularly use data loggers to attach thermocouples directly to the products and measure the actual "product temperature profile." A guide for setting optimal curing conditions, taking into account the heating time, is available for download as free technical documentation. [Summary] By managing based on "product temperature" rather than the oven temperature during the drying process, stable paint film hardness can be achieved. Eiwa Kogei Co., Ltd. assesses the heat capacity of each product and provides high-quality metal coatings under optimal curing conditions.
basic information
Baking temperature: 160-190 degrees / Baking time: 20-60 minutes / Temperature management: actual measurement with thermocouples / Conditions for different resins (melamine, polyester, alkyd) supported / Stable supply of hardness 4H or higher
Price range
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Applications/Examples of results
Thick meat parts, automotive parts, industrial machinery
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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.