When tape is applied to the grid and then removed, the coating comes off. The way it peels can help identify whether the cause is due to degreasing, chemical treatment, or baking.
When the tape was removed during the grid test, the paint film came off with it. There are hints about the cause in the way it peeled off. 【First, please look here】 □ The base metal is visible as is → This indicates poor adhesion with the material. Suspect degreasing or chemical treatment issues. □ Only the primer remains, and the topcoat has come off → This indicates poor adhesion between layers. Suspect the interval between coatings. □ The corners of the squares are chipping and cracking finely → This is due to overbaking, making the paint film brittle. 【Why distinguish these issues】 Whether the peeled surface is the base or between paint layers changes the process that needs to be corrected. Changing the paint without examining the peeled surface will not improve adhesion. 【Countermeasures you can implement starting today】 1. Take a photo of the peeled surface and record which layer it came off from. 2. If it's the base, review the pretreatment; if it's between layers, reconsider the drying time. 3. If overbaking is the issue, compare the furnace temperature and time with your records. 【Free materials】 You can download a guide summarizing how to distinguish and address painting troubles for free from the related catalog on this page. Eiwa Kogei offers services from zinc phosphate chemical coating to baking paint.
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basic information
Evaluation method: Grid test (tape peeling). Identification method: Peeling surface (substrate, interlayer, fine cracks). Management items: Degreasing, chemical treatment, interval between coats, baking temperature and time.
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Applications/Examples of results
Incoming inspection of painted products, evaluation of adhesion, process audit of painting subcontractors. Quality assurance department's defect analysis, 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.
