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  6. Why do blemishes occur on painted surfaces? What is the root cause of foreign matter contamination?

Why do blemishes occur on painted surfaces? What is the root cause of foreign matter contamination?

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last updated:Jul 17, 2026

永和工芸
永和工芸
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Reviewing the work environment is the key to quality improvement.

Are there any blemishes on the painted surface? Even small foreign objects can have a significant impact on appearance quality. Many causes stem from dust in the air or contamination in the work environment. Insufficient management of the paint booth and air quality also play a role. As a countermeasure, it is important to maintain the cleanliness of the environment. Poor painting cannot be improved with a vague approach. Accurately identifying the cause is the first step in preventing recurrence. We have published materials summarizing examples of measures against foreign object contamination. Please check them to avoid repeating the same troubles.

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Why do blemishes occur on painted surfaces? What is the root cause of foreign matter contamination?

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  • Related Link - https://kinzokutoso.com/
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【Available Coating Types】 - Powder Coating (Solvent-based) - Powder Coating - Air-dried Coating 【Quality Control System】 - Management of Booth Cleanliness - Regular Replacement of Air Filters - Thorough Cleaning of Work Environment - ISO 9001 Certified 【Supported Materials】 - Metals in General, including Iron, Stainless Steel, Aluminum, and Zinc Die Casting

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Metal product baking paint and powder coating Improvement of foreign matter contamination (defects) and ensuring appearance quality Manufacturers of building hardware, vehicles, machine parts, and electrical equipment Purchasing and design personnel considering the stabilization of painting quality

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Eihō Kōgei Co., Ltd. Company Profile | Metal Coating, Coating Removal, Zinc Plating, Pre-treatment for Coating, Test Coating, Mass Production Coating

Eihō Kōgei Co., Ltd. Company Profile | Metal Coating, Coating Removal, Zinc Plating, Pre-treatment for Coating, Test Coating, Mass Production Coating

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永和工芸

永和工芸

Ferrous/Non-ferrous metals

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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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