When taken out of the curing oven, the surface of the coating film is wrinkled. This explains the cause of the "shrinkage," where only the surface hardens first, as well as the management of coating thickness and temperature rise.
The surface of the parts taken out of the furnace is shrunk like wrinkles. It looked nice right after painting, but defects appeared after baking. 【First, please look here】 □ Only the thickly painted areas have wrinkles → Too much paint was applied at once □ Fine wrinkles appear all over the part → The temperature rises immediately after entering the furnace, causing the surface to harden first □ Only the areas with multiple coats have wrinkles → The top coat is applied before the underlying paint film has completely dried 【Why this happens】 When the surface hardens first, the paint inside shrinks later, pulling on the surface. This force causes the surface to ripple and wrinkle. 【Countermeasures you can implement starting today】 1. Control the thickness of each coat and apply thin layers 2. Allow a setting time after painting before placing it in the furnace 3. For multiple coats, establish and adhere to the drying time of the underlying paint film 【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 adjusts conditions for painting from test coatings to mass production using three types of equipment.
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basic information
Defect: Shrinkage (wrinkles). Management items: Coating thickness per application, setting time, furnace heating, drying time for re-coating.
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Applications/Examples of results
Metal parts with thick film baked coatings and multiple layers of paint. Review of baking conditions by the quality control department, skill training for painters, and 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.
