What is the most important aspect of the painting process, called "keren"? Introduction to the work method and its effects.
The performance of the coating is determined by "keren"!
What is Keren? On a normal surface, there are almost always "foreign substances" such as rust, oxidation films, dirt, and debris attached. Keren is the process of removing these foreign substances and cleaning the surface. Like "substrate adjustment" and "undercoat treatment," it aims to prepare the surface for painting, making it suitable for application. Substrate adjustment is the work done on the base material (the unpainted surface). Undercoat treatment is the work done on the substrate (the painted surface). While there is no strict definition, Keren is generally recognized as "a comprehensive pre-treatment for painting that includes substrate adjustment and undercoat treatment." Harada Iron Works, with 80 years of experience, provides detailed explanations of Keren's methods and effects. Harada Iron Works Co., Ltd. Website: https://harada-tekkou.co.jp/
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basic information
Leave the blasting to Harada Ironworks in Hiroshima. "If you are looking for a contractor capable of blasting" or "I want a comprehensive service from surface preparation to top coating," please feel free to consult Harada Ironworks if you have any issues with blasting or painting. Harada Ironworks owns two large blasting facilities, considered the highest grade among surface preparation tasks. We perform processing using "air blasting," which can accommodate complex shapes such as the interiors of tanks and large assembled products, and by changing the abrasive materials used, we can meet many requests regarding material, shape, and desired finish! We also have painting facilities, so we can quickly perform primer painting within the basic time frame of four hours after surface preparation. For 80 years since our founding, we have specialized in heavy-duty anti-corrosion coatings that withstand harsh environments such as marine and underwater conditions. The durability of the product is determined by the quality of "surface preparation" and "painting"! - Exposing a clean metal substrate free of any contaminants through blasting - Rapid primer treatment to prevent rust return or re-contamination of the surface - Uniform painting without unevenness while managing the specified film thickness - Thorough inspection of the finish's appearance and film thickness
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Applications/Examples of results
Keren is classified into types 1 to 4 based on the method of work and the rate of foreign matter removal. Type 1 Keren polishes the surface using blast processing that collides particles called abrasives at high speed. It achieves the best effect and cleanliness among the four types of Keren. It almost completely removes all foreign matter such as surface rust, paint film, oxide film, and dirt, exposing a clean substrate. The method of blasting and the type of abrasive do not matter, but it is necessary for more than 95-99% of the surface to be free of foreign matter. Type 2 Keren uses electric tools like disc sanders and wire wheels, as well as hand tools, to polish the surface. It has excellent effect and cleanliness, second only to Type 1 Keren. It removes rust, paint film, and dirt from the surface as much as possible. Rust and paint film that are firmly adhered and difficult to completely remove are acceptable. Type 3 Keren uses hand tools such as sandpaper, scrapers, and wire brushes to polish the surface. It provides minimal effect and cleanliness and is generally performed in the early stages of rust formation or on small areas. It removes dirt and low-adhesion rust and paint film from the surface. High-adhesion rust and paint film that are difficult to remove are acceptable.
Company information
Our company manufactures products tailored to the diverse needs of various sites. We respond to customer requests with our capabilities, advantageous location, and thorough quality and delivery management. You can trust us with everything from material ordering to can manufacturing, processing, surface preparation, and painting. Additionally, we have dedicated many years to research and development in rust prevention, establishing a solid technology and facilities as a "rust prevention department," and we also perform tasks such as paint stripping. Please feel free to contact us with any requests.
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