Even though the paint is the same and has the same color number, the color differs between batches. I will explain the effects of insufficient mixing and differences in curing time.
Even though it's the same color number of paint, the color is different from last month's batch. The paint hasn't been changed. So what has changed? ────────────── ■Cause of Occurrence Pigments settle due to differences in specific gravity, so if mixing is insufficient, the hue will shift. Additionally, if the curing time is extended, white and light colors will shift towards yellowing. ■Truth There can be color differences between the surface and the bottom of the can, even with the same paint right after opening. Just a 10-minute increase in dwell time in the oven can result in noticeable color differences. If the film thickness changes by 10 microns, the visibility due to substrate transparency will also change. ■Improvement Measures Standardize the mixing time before use in minutes and keep a record. Manage the curing process including the dwell time in the oven, and verify color samples against the actual product for each batch. Please utilize the documentation that summarizes the standardized procedures for color difference management.
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Corresponding construction methods: solvent-based baked coating, powder coating / Color management: color sample matching, color difference measurement support / Film thickness: 20-40 microns / Baking temperature: 140-200 degrees / Records: process records of mixing time and dwell time in the furnace
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Powder coating of mass-produced parts that require color management, such as automotive components, appliance housings, store fixtures, and office furniture. We have a track record of standardizing mixing and curing times as a countermeasure against color differences between batches.
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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.
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