原田鉄工 List of Products and Services

In on-site work, "protection" refers to the act of "protecting objects and their surroundings from damage and dirt." It is precisely because thorough protection is carried out that subsequent work can be performed safely and reliably. There are various types of protective materials, but it is necessary to select appropriate protective materials considering the purpose of the protection work, the shape of the objects, and the required strength. The "protection" that determines the finish of the product and the presence or absence of damage is actually a very important task! At Harada Iron Works, we are equipped with the most advanced surface preparation technology, including "large-scale blasting equipment" and a vast "indoor painting facility." By completely cleaning and exposing the metal surface through blasting treatment and creating fine irregularities on the surface, we significantly improve the adhesion of the paint and ensure high durability. In subsequent painting, we provide "long-lasting," "beautiful," and "rust-free" coatings by thoroughly managing the film thickness and painting environment.

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"About substrate adjustment and surface preparation" This is a process carried out as a pre-treatment before painting, aimed at making the substrate more suitable for painting. "Substrate adjustment" is a type of surface treatment method, commonly referred to as "cleaning work" or "surface preparation." It involves removing foreign substances such as rust, dirt, oil, and oxidation films that are attached to the surface before painting, thereby preparing the surface for painting. The methods and precision are defined by standards such as "SSPC standards," "ISO standards," and "SIS standards." "About SSPC Standards" The Steel Structures Painting Council (SSPC) is a non-profit organization based in the United States that establishes standards specialized in coatings that protect industrial and offshore structures. SSPC focuses on fields such as painting and substrate adjustment, and has established numerous standards related to substrate adjustment. [SSPC Standards: Work Methods and Precautions] https://www.nc-net.or.jp/company/98405/product/detail/208826/

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The difference between shot and grit lies not in the material or processing method, but in the shape. There are various shapes of abrasives (grinding materials) used in blast processing, and the processing effect and finish can vary greatly depending on the shape. "About the shapes of blast abrasives" The shapes of abrasives can be broadly divided into three types: 1. Spherical / Round Cut This shape is cylindrical or polygonal with edges ground to resemble a sphere, referred to as "shot," "beads," or "round cut," with many products named with the material name before or after. Example: Steel shot, stainless beads 2. Cylindrical / Wire Cut This shape is cylindrical, created by finely cutting wire material. It is referred to as "wire cut" or "cut wire," with many products named with the material name before or after. Example: Steel cut wire, stainless cut wire 3. Polygonal / Sharp Angle This shape has many sharp angles and is characterized by a polygon with pointed corners. It is referred to as "grit," with many products named with the material name before or after. Example: Steel grit, stainless grit

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"Benefits of Using ISO Sa2" ISO Sa2 is the third highest cleanliness standard in surface preparation. Higher standards like ISO Sa3 and ISO Sa2.5 require the removal of almost all surface contaminants, but Sa2 allows for a broader range of acceptable conditions, enabling cost and time savings. The acceptable level of adhered dirt is such that it does not detach with a putty knife that has no blade. Although some dirt may remain after blasting, the cleanliness is still superior compared to ISO St3, known as two-grade cleaning, and high adhesion with paint is expected. By removing foreign substances through blasting and creating a textured surface, the performance of the paint can be maximized, preventing early peeling of the coating and extending the product's lifespan. Products used outdoors typically select this type of specification. "Method of Working with ISO Sa2" 1. Remove slag, welding spatter, and other contaminants adhered to the surface. 2. Use solvents to remove oils, greases, and other substances adhered to the surface. 3. Completely remove all foreign substances adhered to the surface through blasting. 4. Use clean, dry air to remove dust and debris.

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【For information on ISO standard surface preparation, click here】 https://www.nc-net.or.jp/company/98405/product/detail/210553/ 'ISO Sa1 Work Method' 1. Remove any slag, welding spatter, etc. that is adhered to the surface. 2. Use solvents to remove any oils, greases, etc. that are adhered to the surface. 3. Remove all foreign substances adhered to the surface by blasting. 4. Remove dust and debris with clean, dry air. 'ISO Sa1 Precautions' Feasibility of construction depending on environmental conditions - Please stop work on days with bad weather or high humidity. Painting process after work completion - The surface after blasting becomes active and rust will form in a short time, so painting needs to be done promptly. - If rust occurs again before painting, blasting treatment will need to be performed again. - Compare with the photos in the ISO visual book to determine the acceptance of processing.

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Blasting processing is a type of "substrate adjustment" that involves simultaneously spraying compressed air and abrasives to collide the material and abrasives at high speed. The abrasives that collide at high speed scrape away the surface of the material, exposing it. The surface of untreated materials often has a lot of oxidation films (mill scale), rust, and impurities attached to it. If these impurities are not removed, the paint will quickly peel off. Careful substrate adjustment can prevent painting defects before they occur. Blasting does not use chemicals, and there are many types of abrasives available, making it a significant advantage as it can process various materials without restriction. Additionally, it is very effective not only for painting but also as a pre-treatment for plating, lining, and coating. The countless bumps and indentations created by the impact of the abrasives increase the contact area, allowing for the 'anchor effect' where the material penetrates into the gaps and hardens. This effect significantly enhances adhesion, resulting in a more beautiful finish for the paint. With no impurities and a strongly adhered paint, it is said that the anti-corrosion effect lasts 3 to 4 times longer compared to regular painting. This allows for a reduction in the frequency of repainting, repairs, and maintenance, extending intervals and thus conserving resources and costs.

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"Painting Specifications" Primer for Stainless Steel Urethane Resin Topcoat [Metallic Bronze] Clear Coat It was a complex shape made of decorative wire mesh used in architectural interiors, but we were able to finish it beautifully without any missed spots. We usually focus on painting machine parts, but we can also handle parts where aesthetics are prioritized! Stainless steel has a beautiful appearance even without paint, but adding color can enhance its beauty even further. Although stainless steel materials like SUS304 are said to be difficult to paint, it’s not a problem for Harada Ironworks. [Is Painting on Stainless Steel Possible? Methods and Techniques] https://www.nc-net.or.jp/company/98405/product/detail/197530/ Stainless steels like SUS304 have a characteristic of being resistant to rust, but that doesn’t mean they are completely rust-proof. By applying paint, we can further improve weather resistance, making it "even less prone to rust and beautifully finished!" [Can Stainless Steel Rust? Causes and Methods to Remove Rust] https://www.nc-net.or.jp/company/98405/product/detail/207003/

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"About Heavy Anti-Corrosion Coating" Heavy anti-corrosion coating refers to a type of protective coating that is specialized for corrosion resistance and durability, aimed at extending the repainting cycle of steel structures (such as bridge piers that cross the sea, plants operating in coastal areas, and port crane facilities) constructed or installed in highly corrosive environments like coastlines and offshore. Before the invention of heavy anti-corrosion coating, general specifications were used for painting, but in highly corrosive environments, frequent repainting and inspections became necessary, which posed a problem. Since 1970, a painting specification with higher durability, known as "heavy anti-corrosion coating," has been developed. "Durability of Heavy Anti-Corrosion Coating" The expected durability of heavy anti-corrosion coating is said to be 50 years for new coatings and 40 years for repainting work. Due to the thicker film thickness, it is less affected by thickness reduction due to aging, and regular maintenance further extends its lifespan. Additionally, topcoat materials used include urethane resin paint and fluororesin paint, with fluororesin paint offering superior weather resistance, thus ensuring greater durability. [Urethane Resin Paint] Film deterioration after the second year: 2.0μm/year [Fluororesin Paint] Film deterioration after the seventh year: 0.5μm/year

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"Ultimate Paint Stripping Prevention" The measures against paint stripping are very simple. - Surface preparation is done through blasting, removing all foreign substances attached to the surface. - Use paint with excellent adhesion to the material appropriately. - Select a paint specification with high corrosion resistance and weather resistance to prevent stripping for a long time. - Manage the paint application to maintain the appropriate film thickness. By adhering to the above four points, a paint that will not peel for over 30 years can be achieved! [Improving the Service Life of Heavy Anti-Corrosion Coatings] https://www.nc-net.or.jp/company/98405/product/detail/186702/ Harada Iron Works is equipped with large air-operated blasting equipment. We regularly use "grit blast" and "sand blast" abrasives, but we can also accommodate other abrasives, so please feel free to inquire. After blasting, prompt rust prevention treatment is necessary, but since Harada Iron Works also has a painting factory, we can provide a consistent response from blasting to topcoat application in-house. For more details, please see the related links below.

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"How to Remove Rust" 1. Use a rust remover It can dissolve and reduce mild rust. It allows you to remove rust without scratching the surface, and it's easy since you just apply it and wipe it off afterward. Since it is a chemical product, be sure to check the usage instructions and disposal methods thoroughly before use. 2. Use sandpaper or a wire brush for polishing Mild to moderate rust can be removed or reduced by polishing with paper or a brush. It takes time and effort, but it is the most cost-effective way to remove rust. Be careful not to apply too much pressure, as this may cause significant scratches on the surface. 3. Use power tools for polishing Mild to moderate rust can be removed or reduced by polishing with power tools. It allows you to remove rust faster and more easily than rust removers or sandpaper. However, using power tools carries a higher risk of injury or accidents, so be sure to wear appropriate protective gear. However, options 1, 2, and 3 can be quite labor-intensive for removing extensive or severe rust, so they are not recommended. So, how can you remove extensive or severe rust?↓↓

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"The Causes of Stainless Steel Rusting" Stainless steel has the characteristic of being resistant to rust, but it is not completely rust-proof! There are four main causes of rusting in stainless steel. 1. Contaminated Rust This phenomenon occurs when stainless steel comes into contact with other types of metals, causing the passive film to break down and resulting in rust on the stainless steel. Stainless steel that has been scratched by other metals may gradually rust from the damaged areas. 2. Salt and Acidity The passive film that protects stainless steel from rust is vulnerable to salt and acids. In regions such as coastal areas, where it may come into contact with acidic chemicals, stainless steel can rust. 3. Dirt and Moisture Areas that are contaminated with dirt or water can have their passive film destroyed, leading to rust. 4. Welding and Bending Processes Welded or bent areas may retain residual stress from the processing. If this residual stress remains, it can lead to deterioration of the crystal structure, resulting in rust formation.

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"ISO St2" ISO is a non-governmental organization headquartered in Geneva, Switzerland, aimed at establishing internationally common standards. It is one of the standards set for surface preparation. Surface treatment is performed using hand tools such as files, wire brushes, and scrapers. Harmful substances like loosely adhered rust, mill scale, and paint films are removed, but firmly adhered rust, mill scale, and paint films are acceptable. The ISO standard compares the condition of steel before and after blasting with photographs, allowing for the assessment of processing quality by comparing actual photos and products. "Benefits of ISO St2" When using blasting or power tools, equipment is required, and dust and noise are generated, making it a standard chosen when such work is difficult due to considerations of the surrounding environment. Additionally, it requires a significant amount of time and cost, making it unsuitable for large-scale or extensive work; however, it may be used for surface preparation in cases of partially damaged paint. While it is a convenient method that does not require equipment, it cannot remove firmly adhered rust, mill scale, or paint films.

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What is SSPC SP-2?" SSPC is a non-profit organization in the United States that specializes in coatings for the protection of industrial and marine structures. It is one of the standards established for surface preparation. Surface treatment is performed using hand tools such as files, wire brushes, and scrapers. Harmful substances like loosely adhered rust, mill scale, and paint films on the surface are removed, but firmly adhered rust, mill scale, and paint films are acceptable. Inspection is conducted visually. "What do the terms 'surface preparation' and 'substrate treatment' mean as written in the specifications?" Generally, it is considered equivalent to the ISO St2 standard. "For information on ISO standards, please refer to the link below." "ISO St2: Surface preparation performed with hand tools.

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"Red Rust" Chemical formula: Fe₂O₃, Cu₂O Target metals: Iron, steel, copper, copper alloys The "red rust" is something we often encounter in our daily lives. For red rust to occur, air and moisture are necessary, and corrosion begins through "ionization," which robs electrons from iron. As long as it is in contact with air and moisture, red rust (Fe₂O₃) will erode inward, ultimately causing the metal to crumble. However, the red rust that forms on copper (Cu₂O) has some ability to prevent corrosion from water and seawater, which is why it is sometimes used as a raw material for ship bottom paint. "Black Rust" Chemical formula: Fe₃O₄, Ag₂S Target metals: Iron, silver This "black rust" is commonly seen on iron frying pans and cast iron skillets. It is generated by heating the target metal at high temperatures and is referred to as "dry corrosion" because it does not involve water. Since black rust (Fe₃O₄) does not erode inward, it can actually suppress red rust by covering it. The black rust (Ag₂S) that forms on silver items such as tableware and accessories occurs due to a "sulfide reaction," where sulfur components found in skin and hair bind to silver. This black rust also does not erode inward. Continues to basic information ↓

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To maintain a beautiful paint film for a long time without peeling, the following four points are important: 1. Degreasing Treatment Metal materials are often exposed to cutting oils and other substances during cutting and processing. Therefore, most processed materials have oil residues on their surfaces. If there is oil on the surface, the paint will be repelled during application, leading to poor adhesion. It is important to thoroughly wipe off the oil using organic solvents such as thinner and allow the surface to dry. 2. Surface Preparation (Substrate Adjustment) Prepare the substrate to be suitable for painting. This process, also known as "keren," involves scraping the surface to create scratches that enhance the adhesion of the paint. If rust has already formed, painting over it will allow the rust to progress from underneath the paint, so it must be removed. Painting over deteriorated paint films can also cause poor adhesion, so the old paint film should be stripped away. Methods include blast treatment, sanding with a disc sander, or scrubbing with a wire brush or sandpaper. After processing, debris will be generated, so be sure to clean thoroughly! 3 and 4 are detailed in the basic information below.

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There are various causes for paint peeling, but the main ones are as follows: 1. Surface Preparation - "Insufficient surface preparation" → Impurities such as oxidation films, rust, and old paint have not been completely removed. - "Residual grease and dirt" - "Improper substrate adjustment" → Appropriate substrate adjustment has not been performed according to the type and condition of the metal. 2. Environmental Conditions - "Salt damage" → In environments with high salt content, such as coastal areas or industrial zones, the paint film suffers from salt damage, leading to accelerated deterioration. - "Ultraviolet rays" → Ultraviolet rays promote the degradation of paint, causing chalking, cracking, and ultimately peeling. - "Temperature changes" → Expansion and contraction of the paint film and substrate due to temperature changes can lead to cracking and peeling. 3. Incorrect Paint Selection - "Weather resistance" → Paint suitable for outdoor or indoor use, as well as heat resistance, has not been selected according to the usage environment. - "Compatibility of paints" → When applying different types of paint in layers, compatibility with each other has not been considered. - "Compatibility with materials" → Paint suitable for materials such as wood, iron, and stainless steel has not been used. 4. Poor Application - "Insufficient drying" → Moving on to the next step before the paint is completely dry weakens the paint film. - "Excess or insufficient application amount" - "Layering interval" → The timing for applying additional layers is either too early or too late.

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Methods for Removing Paint" "Chemical Methods" 1. Use a "stripper" designed for removing paint. There are methods such as applying the stripper to the paint and letting it sit, or soaking the item in a container filled with stripper. "Physical Methods" 2. Use tools such as "sandpaper" or a "scraper." This method involves rubbing or scraping the paint off with tools, and many specialized tools are available for this purpose. 3. Use power tools such as a "disc sander" or "air hammer." This method involves pressing a tool that rotates or uses a piston to remove the paint. 4. "Blast Treatment" This method removes surface paint by colliding abrasives at high speed. In general, when removing paint, methods such as '1' + '2' or '1' + '3' are used in combination. Since it is difficult to completely strip the paint, a stripper is used to remove a certain amount, and then tools are used to remove the remaining paint. 4. With blast treatment, it is possible to quickly and reliably remove paint regardless of the type of paint. When repainting during renovation or maintenance, the durability of the new paint significantly changes based on "how much of the old paint film has been removed and how well the surface has been prepared.

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"ISO Sa2.5" refers to one of the standards for surface preparation established by ISO (an international non-governmental organization based in Geneva, Switzerland, aimed at creating internationally common standards). It requires the removal of visible contaminants (such as oil, dirt, rust, and oxides) from the surface, allowing only slight traces of dirt in the form of spots or streaks. "Benefits of ISO Sa2.5" ISO Sa2.5 is the second highest cleanliness standard for surface preparation. The highest standard, ISO Sa3, requires the removal of almost 100% of surface contaminants, which can be costly and time-consuming. ISO Sa2.5 allows for a maximum of 5% minor contamination, reducing costs while still ensuring sufficient cleanliness, making it a widely used standard. Surfaces prepared to Sa2.5 can maximize the performance of coatings, preventing early delamination of the paint film and extending the product's lifespan. This specification is often chosen for harsh environments, such as highly corrosive coastal areas.

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SSPC is a standard established by the Steel Structures Painting Council USA, and SP-10 (Near White Metal Blast Cleaning) requires the removal of more than 95% of visible surface contaminants (such as oil, dirt, rust, and oxides). The method of application only permits dry blasting. SSPC SP-10 is the second highest level of standard for surface preparation. The highest standard, SSPC SP-5, requires nearly 100% removal, which poses a cost issue. SSPC SP-10 necessitates the complete removal of rust adhered to the surface, while allowing for slight discoloration or shadows of mill scale and oxide films up to 5% of the surface area, thereby reducing costs while ensuring sufficient cleanliness, making it a widely used standard. By removing 95% of surface contaminants, it maximizes the performance of the paint and prevents early peeling of the coating, thereby extending the product's lifespan. Such specifications are chosen for harsh environments, such as highly corrosive coastal areas.

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"Work Method for ISO St3" 1. Remove slag and other contaminants adhering to the surface. 2. Use solvents to remove oils, greases, and other substances adhering to the surface. 3. Use power tools to remove weakly adhered harmful substances from the surface. 4. Use hand tools for areas where power tools cannot be used. 5. Remove dust and debris with clean, dry air. "Points to Note for ISO St3" Hazards in the Work Process - Since power tools are used, appropriate protective gear must be worn, and precautions against fire due to sparks are necessary. Post-Processing Painting Steps - The treated surface becomes active and rust can form quickly, so painting must be done promptly. - Areas that cannot be treated with power tools, such as corners and complex structures, need to be processed using hand tools as well. - Compare with photos in the ISO visual book to determine the quality of processing. At Harada Iron Works, we also accommodate surface preparation for St3, but since there may be insufficient cleanliness and adhesion with St3 surface preparation, we generally recommend surface preparation by blasting. For more details, please refer to the related link URL below.

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What is ISO?" ISO is a non-governmental organization headquartered in Geneva, Switzerland, aimed at establishing internationally common standards. The standards are classified based on surface cleanliness (rust removal level) and construction methods. "Standards for Surface Preparation according to ISO" The standards for surface preparation according to ISO are divided into six types. Among them, the widely used ones are summarized below regarding "work methods" and "points to note." 【ISO St3】Surface preparation using power tools https://www.nc-net.or.jp/company/98405/product/detail/227861/ 【ISO St2】Surface preparation using hand tools https://www.nc-net.or.jp/company/98405/product/detail/228939/ The remaining four are listed under "Basic Information.

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【What is Can Manufacturing】 Can manufacturing has two meanings. 1. The production of cans such as canned food and canned juice. 2. The process of cutting and welding metal to create products. This time, I will explain the meaning of can manufacturing in the context of producing products, which is what Harada Iron Works also engages in. To transform metal into products, the material is processed by cutting and bending to shape it, followed by welding and assembly to create three-dimensional products. This entire process is called can manufacturing. 【Flow of Can Manufacturing Process】 1. Drawing creation 2. Cutting 3. Bending 4. Tack welding and final welding 5. Finishing and distortion correction 6. Machining 7. Surface preparation and painting 8. Assembly 【Summary】 Transforming metal into products. The meaning of "can manufacturing" involves processing the raw material metal by cutting and bending to shape it, followed by welding and assembly to create three-dimensional products. In reality, there are many more processing methods, and the joy of manufacturing lies in selecting among them. For more details, please refer to 'What is Can Manufacturing? - Introducing the Flow of Can Manufacturing' https://www.nc-net.or.jp/company/98405/product/detail/182555

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"What is film thickness?" Film thickness refers to "the thickness of a cured paint film," measured in μ/µm (microns/micrometers). 1μm = 0.001mm, which is an extremely fine unit. In general mechanical painting, Harada Iron Works often achieves the following film thickness: For primer only: 15µm to 75µm For topcoat: 300µm to 500µm The degree of reduction varies depending on the type of paint and the environment in which it is used, but film thickness gradually wears down each year. Therefore, a film thickness of just 10μm or 100μm can significantly change the durability of the coating. However, it is not simply the case that thicker film is better! Each type of paint has a specified film thickness at which its protective capabilities are maximized (refer to the manufacturer's paint documentation). The best approach is to form a coating with an appropriate thickness that is neither too thick nor too thin! It is extremely important not only to apply paint but also to manage film thickness properly and maintain it within the appropriate values! At Harada Iron Works, we have painted many products under strict film thickness management. If you have any concerns regarding painting, please feel free to consult us.

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**Differences Between Type 1 and Type 2 Surface Preparation for Paint Removal** Paint removal was performed using Type 1 and Type 2 surface preparation. When we zoom in on the surface after processing, there is a significant difference. [See image] What exactly is surface preparation? It is introduced in the link below: [What is Surface Preparation in Painting? Purpose and Types] https://www.nc-net.or.jp/company/98405/product/detail/196279/ **About Surface Preparation Work** The most important aspect of painting is surface preparation. Surface preparation, also known as "keren," is divided into four types: Type 1 to Type 4, based on the work content and processing methods. All methods aim to change the surface to a state more suitable for painting, but there is a significant difference in the finish between Type 1 and Type 2 after processing, as shown in the photos. In metal painting, the lifespan of the paint is said to be between 10 to 50 years at most. What influences this paint lifespan is not the type or quality of the paint or the painting technique, but rather the processes before painting. The method of surface preparation is the cause that affects the paint lifespan. Type 1 and Type 2 surface preparation accounts for about 50% of the differences in paint lifespan.

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Only the exterior of the product was treated. By removing all detachable parts for treatment, we were able to achieve a uniform finish. The exterior had both stainless steel and plastic resin components, but we ensured adhesion by performing surface preparation with blasting and applying a special primer that is compatible with SUS and PP. We were concerned about the strength of the cooler box's thickness and adjusted our blasting process accordingly, but there was absolutely no deformation with this product! Once the surface preparation was completed, we immediately proceeded to the painting process. We applied a special primer and finished with a black urethane resin in a semi-gloss (30% gloss) finish. The semi-gloss black coating can show color unevenness if applied too thinly and can become glossy if applied too thickly, making it a challenging paint job, but the skill of the craftsman resulted in a beautifully uniform semi-gloss finish. The customer's preference was for a matte black finish; however, a completely matte finish has the drawback of having a textured surface that easily collects dirt and is difficult to clean. Since coolers are often used outdoors, we proposed a semi-gloss finish to ensure they remain in good condition for a long time, and we painted it accordingly. Stainless steel materials like SUS304, which are said to be difficult to paint, pose no problem for Harada Ironworks.

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"Aluminum Coating Method" 1. Surface Cleaning It is essential to thoroughly remove any oils and dirt adhered to the surface. If the surface is not cleaned using organic solvents or detergents, the paint will not adhere properly and will peel off, so this step must be done carefully, and the surface must be thoroughly dried afterward. 2. Surface Polishing By polishing the smooth surface of the aluminum and creating fine scratches, the paint can penetrate into these scratches and adhere firmly to the aluminum. This process is also crucial for removing surface oxides, significantly affecting the outcome regarding paint peeling. 3. Specialized Primer If a specialized paint with good adhesion to aluminum is not used, there is a high possibility that it will peel off easily. Additionally, in environments with significant temperature fluctuations, using paint with insulation and heat shielding properties can prevent or reduce paint peeling due to thermal expansion. 4. Uniform Coating After completing the specialized primer, apply the intermediate and top coats suitable for the usage environment. Adhere to the appropriate drying times specified by the paint manufacturer and confirm that the paint has fully cured before applying additional layers. When painting, it is necessary to ensure that the paint film has a uniform thickness. Uneven thickness in the paint film can lead to areas that are prone to peeling, so caution is advised.

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How does Keren work? Keren basically removes foreign substances by grinding or rubbing the surface. For example, it involves polishing the surface with sandpaper or a brush. Additionally, depending on the method of work, it is classified into four types known as Type 1 Keren to Type 4 Keren. What are the four types of Keren? Type 1 Keren... Blast method. A method that involves colliding abrasives with the surface at high speed for grinding. Type 2 Keren... Uses power tools. A method that involves rubbing the surface with tools like grinders. Type 3 Keren... Uses hand tools. A method that involves rubbing the surface with tools like wire brushes. Type 4 Keren... Uses hand tools. A simple cleaning and roughening method using sandpaper. As such, the types are categorized by the method of work, and the degree of cleanliness is as follows: Cleanliness Low ➩➩➩➩➩➩➩➩➩➩➩➩➩➩ High Type 4 Keren Type 3 Keren Type 2 Keren Type 1 Keren [Difference between Type 1 Keren and Type 2 Keren in terms of stripping] https://www.nc-net.or.jp/company/98405/product/detail/186195/ Harada Iron Works possesses large equipment dedicated to the highest level of Keren, "Blast."

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List of SSPC Standards 'SSPC-SP5 / NACE No.1' White metal blast cleaning 'SSPC-SP10 / NACE No.2' Near-white metal blast cleaning 'SSPC-SP14 / NACE No.8' Industrial blast cleaning 'SSPC-SP6 / NACE No.3' Commercial blast cleaning 'SSPC-SP7 / NACE No.4' Brush-off blast cleaning 'SSPC-SP16' Brush-off blast cleaning 'SSPC-SP11' Power tool cleaning to bare metal 'SSPC-SP15' Commercial grade power tool cleaning 'SSPC-SP3' Power tool cleaning 'SSPC-SP2' Hand tool cleaning 'SSPC-SP1' Solvent cleaning For more details, please refer to the related links.

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"About Stainless Steel" It is an alloy primarily composed of iron (Fe) and chromium (Cr). Chromium combines with oxygen to create a "passivation film" known as chromium oxide. Because it is covered by this passivation film, it has higher corrosion resistance and is less prone to rust compared to regular carbon steel. "Reasons Why Stainless Steel Paint Peels Easily" - Smooth Surface The surface of stainless steel is very smooth, which prevents the paint from adhering properly, leading to peeling. - Presence of Chromium Oxide The chromium contained in stainless steel combines with oxygen to form chromium oxide, which protects the surface with a thin film. This film hinders the adhesion of the paint, making it more likely to peel off.

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"SSPC SP-3" SSPC is a non-profit organization in the United States that specializes in coatings for the protection of industrial and marine structures. It is one of the standards established for surface preparation. Surface treatment is performed using power tools such as sanders, wire brushes, chipping hammers, and needle guns. Harmful substances such as loosely adhered rust, mill scale, and paint films on the surface are removed, but firmly adhered rust, mill scale, and paint films are permissible. Visual inspection is conducted. [Summary of SSPC Standards] https://www.nc-net.or.jp/company/98405/product/detail/208826 "Benefits of SSPC SP-3" SSPC SP-3 is the standard for surface preparation when using power tools. Since blasting requires equipment and generates dust and noise, it is selected in cases where considering the surrounding environment makes blasting difficult. Additionally, SP-3 may be used for surface preparation when correcting partially damaged paint. While it is a convenient method that does not require equipment, it cannot remove firmly adhered rust, mill scale, or paint films.

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The products painted at Harada Iron Works are often used in environments that "cannot withstand normal painting." In environments such as offshore, underwater, and on water, simply applying paint over metal will lead to peeling within a few years. Corrosion progresses from the areas where the paint has peeled, rendering the product unusable almost immediately. Additionally, it is difficult to perform repair painting in such locations, so a "protective coating" that can last as long as possible is required. Harada Iron Works has been providing "coatings that can withstand harsh environments" for 80 years. With complete blasting equipment and indoor painting facilities, there is no need to worry about "return rust" after blasting treatment. Moreover, painting on stainless steel, which is considered difficult, becomes possible through blasting processing! By applying paint, the characteristics and performance of stainless steel can be enhanced, giving it a beautiful color and making it "more resistant to rust and aesthetically pleasing stainless steel." 【Is painting on stainless steel possible? Impossible? About that method】 https://www.nc-net.or.jp/company/98405/product/detail/197530/

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"Substrate adjustment" is the process of transforming the "substrate," which has not been treated with paint or other finishes, into a surface suitable for painting. "Undercoat treatment" is the process of transforming the "undercoat," which has already been painted or treated, into a surface suitable for painting. Both involve the work of "changing the surface of the object to a state suitable for painting," but the conditions before the work is performed are different. Additionally, substrate adjustment is fundamentally based on surface polishing and degreasing, while undercoat treatment also includes the repair of deteriorated surfaces with primer paint or putty. However, in practice, both "substrate adjustment" and "undercoat treatment" are often listed in specifications without distinction! It may be better not to overthink it and to understand both as having the meaning of "transforming into a surface suitable for painting." For more details on "Methods of substrate adjustment and undercoat treatment," "Importance of substrate adjustment and undercoat treatment," and "Standards for substrate adjustment and undercoat treatment," please refer to the related links below.

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"Airless Spray and Air Spray" The most widely used painting method is painting with a "spray gun." Both airless spray and air spray belong to the category of spray guns. Products painted with spray guns include vehicles such as cars, motorcycles, and boats, large infrastructures like bridges and transmission towers, as well as many everyday items like furniture and appliances. By utilizing the power of compressed air, the paint is atomized into a fine mist and sprayed. These two methods differ significantly in how they atomize the paint. "Airless Spray" applies pressure to the paint using air and discharges only the paint. "Air Spray" applies air to the paint and discharges both the paint and air together. [What is Painting? - About the Painting Process] [The Basics of Painting - Tools and Methods for Painting]

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What is SS400? In JIS (Japanese Industrial Standards), there is a standard for rolled steel materials known as general structural rolled steel. General structural rolled steel is represented by the material symbol SS, and since the minimum tensile strength is 400 MPa, it is called "SS400." It is a type of steel that is widely used across various fields, making it abundant and inexpensive to obtain. It is characterized by its ease of machining and welding, as well as its high versatility. On the other hand, it is a relatively soft material among steels, making it difficult to use in areas that require high strength, and it is prone to rust, necessitating anti-rust treatment. Therefore, some form of rust prevention treatment is required. Additionally, the surface of the steel is covered with "mill scale," which is formed when the surface becomes hot during the manufacturing process and combines with oxygen. If the mill scale is not removed, the anti-rust treatment will not last long. There are two methods for removing mill scale: "pickling" and "blasting," with blasting being superior for preventing rust over a longer period. By completely removing all foreign substances like mill scale through blasting and applying anti-rust treatment to the formed surface of the substrate, SS400 can remain rust-free for an extended period.

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"What is stainless steel?" A special steel made to enhance corrosion resistance compared to ordinary carbon steel. "Characteristics of stainless steel" The biggest characteristic of stainless steel, unlike regular steel, is that it contains chromium. Chromium combines with oxygen to create a "passivation film" known as chromium oxide. Because it is covered by this passivation film, it is less prone to rust compared to ordinary carbon steel. However, this does not mean it is "rust-proof" or "degradation-proof." It can still rust due to factors such as moisture, salt, scratches, dirt, or contact with other types of metals that can cause rust transfer. "Painting on stainless steel is possible!!" By applying paint, the properties and performance of stainless steel can be enhanced, giving it a beautiful color and making it "more rust-resistant and beautiful stainless steel." Please refer to the methods below and related links for painting techniques.

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Harada Iron Works offers comprehensive services from surface preparation blasting to painting! If you are unsure about what to do regarding surface preparation (the process of changing the surface to a condition suitable for painting) or painting specifications, please consult us, and we will select the optimal specifications for you. HP: https://harada-tekkou.co.jp/ YouTube: https://www.youtube.com/@hara-tetu Facebook: https://fb.com/haradatekkou.hiroshima Instagram: https://www.instagram.com/haradatekkou_hiroshima/ Harada Iron Works is one of the largest anti-corrosion painting specialized factories in the Chugoku region. We have large-scale blasting equipment dedicated to surface preparation and an indoor painting factory to prevent rust and ensure products are used beautifully and for a long time. For 80 years since our founding, we have been engaged in the painting of various metal products. We excel in surface preparation and painting for products installed indoors and outdoors, as well as those exposed to harsh environments such as offshore, underwater, and coastal areas.

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At Harada Ironworks, we are equipped with large blast facilities. We also keep polishing materials that can be used on stainless steel, allowing us to remove rust even when it has spread extensively and deeply. The surface after blasting has a subdued luster without shine, making it less noticeable for reflections, fingerprints, and scratches. Mild rust can be removed at home! For more details, please see the related links below. Moreover, rust transfer can be easily prevented by painting! We have extensive experience in both stainless steel blasting and painting, so please feel free to consult us. For more details, please see the related links below.

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Even if you think about trying painting, there are likely many things you don't understand, such as "What do I need?" and "How do I do it?" I will explain the "usage of tools used in painting," "things necessary for painting," and "how to paint." For more details, please download the PDF below. Harada Ironworks Hiroshima Official Link

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Aluminum is often said to be a material that "cannot be painted" and "the paint peels off," similar to stainless steel. In the past, it seems that this was said because there were no paints developed for aluminum, but now it is possible to paint it by using specialized paints and performing proper pre-treatment. I will introduce a painting method that can be applied not only to aluminum but also to stainless steel. For more details, please download the PDF below. Harada Ironworks Hiroshima Official Link

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What is blast processing? Blast processing is a type of surface treatment that involves projecting abrasive materials at high speed to process the surface. This changes and improves the condition and properties of the surface. Structure of blast processing There are two methods of blast processing: "air-type" and "mechanical-type." The air-type uses compressed air to project the abrasive material, while the mechanical-type utilizes a rotating impeller to project the abrasive material using centrifugal force. Effects of blast processing Blast processing grinds the surface and removes impurities. Additionally, fine irregularities are formed, which enhance the adhesion of paints and anti-corrosion treatments. The finish of the paintwork is also made more uniform. Blast processing is effective for anti-corrosion treatment of metals and improving their appearance. Summary Blast processing is an important method of surface treatment and is essential for the success of metal anti-corrosion and painting. The structure is simple, but its effects are significant. Harada Ironworks Hiroshima Official Link

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Blast treatment is a type of surface treatment technology used to remove dirt and old paint from surfaces such as metal, concrete, and wood. Media: The media used in blast treatment includes sand, beads, glass beads, steel shot, steel grit, alumina, and carbon steel. These media are ejected from blast treatment equipment and collide with the surface to remove dirt and old paint. Pre-treatment for painting: Blast treatment is also used for surface preparation before painting. As a pre-treatment for painting, blast treatment improves the adhesion of paint by removing surface dirt and old paint, enhancing the durability and rust resistance of the painted surface. Additionally, by changing the surface shape, it can increase the adhesive surface area for the paint, thereby improving painting quality. Blast treatment is one of the surface treatment technologies and is used in many industrial fields. By selecting the appropriate media, pressure, injection direction, and time, it efficiently removes surface dirt and old paint, and is widely utilized for applications such as pre-treatment for painting, surface modification, and metal processing.

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Spray painting on metal is a technique that enhances aesthetics and weather resistance by spraying paint onto the surface of the metal. Commonly used paints include urethane paint, epoxy paint, acrylic paint, and fluorine paint. These paints can adhere to the metal surface and are excellent in durability and weather resistance. Surface preparation is essential for spray painting on metal. Surface preparation involves removing oils and rust from the metal surface to create a surface that allows the paint to adhere properly. Methods for surface preparation include sandblasting and shot blasting. Additionally, spray painting on metal is performed using a painting machine. A painting machine is a specialized device for spraying paint, using a spray gun or nozzle to apply paint evenly to the metal surface. After application, drying and curing are carried out to form a paint film. Maintenance after spray painting on metal is important. If the paint film is damaged, it is necessary to repaint. Regular cleaning and maintenance after painting can help maintain durability and weather resistance. Spray painting on metal is an important technique for enhancing aesthetics and durability, and it is utilized in many fields.

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Casting is a manufacturing method that involves melting metal and pouring it into a mold to solidify into a specific shape, and the resulting products are called castings. This method allows for mass production of complex shapes, is cost-effective, and boasts high durability. However, without painting, it has a tendency to rust very easily. To paint castings, "degreasing" and "blasting" are essential. The surface is covered with oils, oxidation films, and dirt, so simply painting without preparation will cause the paint to peel off quickly. Additionally, the surface of castings is uneven, and normal surface preparation using sandpaper or power tools can only smooth out the raised areas. Therefore, by removing oils through degreasing and performing blasting to prepare the surface even on uneven areas, it becomes possible to paint the castings. Harada Iron Works' blasting equipment is manual, allowing workers to hold the nozzle and perform surface preparation thoroughly, even on the complex shapes of castings. Great painting comes from proper surface preparation! [Weight] Approximately 3 tons [Surface Preparation] Grid blasting SSPC SP-10 [Painting Specifications] Thick-film aluminum-containing two-component epoxy anti-corrosion paint [Film Thickness] 100μm to 200μm

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"Surface preparation" refers to the process of preparing the underlying material or substrate. Metals are melted, cooled, and solidified during the manufacturing process, but when exposed to high temperatures, they combine with oxygen in the atmosphere to form a film known as an oxide layer. If painting is done without removing this oxide layer and impurities, contaminants can mix between the paint and the substrate, leading to poor adhesion. Additionally, the functionality of the paint may not be realized due to the influence of impurities, preventing it from exhibiting its intended performance. However, by using blasting to prepare the substrate, the surface oxide layer, rust, and other contaminants can be completely removed. Furthermore, using angular abrasives creates countless fine irregularities on the substrate, increasing the surface area for paint adhesion and preventing peeling. By cleaning and preparing the substrate with blasting before painting, the lifespan of the paint film can be extended two to three times, providing long-term economic benefits.

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This product was completely black due to the presence of mill scale (black skin) on the surface before processing. However, by using a technique called blasting for surface preparation, we were able to remove the mill scale from the surface and expose the material itself. Blasting is a technique that removes impurities attached to the surface by spraying high-pressure air or water. Steel changes to a silvery color in this way. By removing impurities such as mill scale and rust from the surface and applying paint, the adhesion of the paint improves, and the lifespan of the paint film is extended. It also helps prevent defects and deterioration in painting due to insufficient surface cleanliness. If the paint does not adhere properly, the paint film may peel off or discolor. Surface impurities are a major enemy to painting and are a crucial factor that affects the lifespan of the paint. If painting is done without surface preparation, impurities will remain under the paint film, accelerating its deterioration. Currently, the SDGs (Sustainable Development Goals) have become a global objective, and we aim to extend the lifespan of products by combining blasting and painting to utilize resources more effectively. By extending the lifespan, we can reduce the frequency of product replacements, leading to resource conservation.

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