Shenzhen HSJ Fab Co., Ltd.
Shenzhen HSJ Fab Co., Ltd.
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Custom Steel SPCC SGCC Powder Coating Parts Bending Laser Cutting Sheet Metal Parts Fabrication
Reliable Manufacturer Textures Polyester Powder Coating
Powder Coatings
Powder coating is a high-quality finish made from particles of pigment and resin that is applied with an electrostatic spray gun. The charged powder particles adhere to the electrically grounded surfaces until the powder is heated in a curing oven and fused into a smooth coating. Powder coating protects the roughest, toughest machinery. It provides a more durable finish than liquid paints can offer, while still providing an attractive finish.
Appliance:
Powder coating is mainly used for coating of metals, such as household appliances, aluminium extrusions, drum hardware, automobiles, and bicycle frames
Advancements in powder coating technology like UV curable powder coatings allow for other materials such as plastics, composites, carbon fiber, and MDF (medium-density fibreboard) to be powder coated due to the minimum heat and oven dwell time required to process these components.
Advantages of powder coatings
1. No VOC problems
2. Easy cleaning
3. No solvents
4. Low health risk to workforce
5. Easy to apply
6. Higher performance
7. Economical advantages
HSJ Sheet Metal Fabrication Progress
HSJ is one of the most professional sheet metal cabinet manufacturers in China. We have rich experience in sheet metal cabinet manufacturing & export and specialized in providing All kinds of customized OEM, and ODM, especially on Designing, material choice, process, choosing, Surface treatment, QC, FQC, OQC, Packing, online face-to-face after-service, Project meeting for one-stop service. Business spread to Power cabinets, energy cabinets, controller cabinets, Solar cabinets, Electric cabinets, Medical cabinets, aircraft cabinets, industrial cabinets, etc.
Surface coating step by step
Pre-treatment: The condition of the surface is decisive for the quality of the coating. The aim of pre-treatment is a clean and grease-free workpiece to which the coating layer adheres well. Depending on the workpiece, sandblasting or chemical preparation is necessary. Here, sandblasting and flushing work with grease-dissolving agents. If high corrosion resistance is required, a basic wet chemical corrosion protection is applied before powder coating.
Application: The prerequisite for powder coating is an electrically conductive substrate. Therefore, metals are ideally suited. However, wood can also be powder coated, as the moisture in the wood creates sufficient conductivity for the process. If plastics are to be powder coated, they must first be made conductive in the surface by a conductive coating. Compared to direct liquid coating, this is often uneconomical. During coating, the workpiece is electrically grounded and the powder is charged. There are two different processes for charging. With Corona charging, the powder is actively charged by a high-voltage cascade built into the powder gun. In the Tribo process, this takes place through the friction of the powder coating on friction bodies in the gun. Today, Corona charging is predominantly used. Adjustment of the charge to the coating and the ambient conditions is very flexible. For example, for thick or thin layers, in relation to the temperature and humidity conditions during processing, structural effects, gloss effects, abrasion resistance or sealing behavior of the finished coating layer. Tribo charging is used when the requirement profile is a very smooth surface or for workpieces with large and narrow recesses. Basically, both processes are used as manual or automatic powder coating.
Cross-linking and drying (curing): At the end of powder application, the coating layer is still in powder form. Since powder is essentially a composite of plastic and color pigments, it melts when heated to temperatures of 160 to 200 degrees Celsius. Curing takes place through the hardeners contained in the composite. In technical jargon, this is referred to as curing. There are also powders that melt at lower temperatures, e.g. at 130-140 degrees Celsius. These are referred to as low-temperature powders. These powders are very sensitive to higher ambient temperatures and must be cooled during the entire process chain. This means also during production, transport and storage, e.g. at 25 degrees Celsius. The decisive factor here is the benefit, i.e. the cost-effectiveness of the energy savings during curing versus the additional costs for the required cold chain.