Powder coating is a dry finishing technique in which an electric charge causes a dry powder to fuse to the metal's surface. To obtain a smooth coating, this is then cooked in a curing oven. It's frequently used to make a harder, more durable finish than regular paint. After the powder coating has been coated entirely to an item, it is then heated and cured in an oven until the powder melts and flows together. Preheated pieces can also be dipped into powder material within a fluidized bed to apply powder coatings. When the powder comes into contact with the heated surface of the part, it melts and fuses. The cured powder provides a smooth, hard finish when the item dries and cools in either situation.
Advantages of Powder Coating
- Organic solvent is not present in the powder coating, which eliminates the risk of fire, poisoning, and unsafe shipping. Although there is a risk of a dust explosion, if the dust concentration in the system is appropriately regulated, the explosion can be completely prevented.
- Powder coating is a fully solid system that can be employed in a closed-circuit circulation system. The powder coating that has been over sprayed can be recycled and reused, with a utilization rate of greater than 95%.
- The thickness of the coating film may be regulated when powder coating is used, and it can reach 30-500 m at a time. It is the equivalent of several to more than ten coats of solvent-based coating, which not only decreases the number of structures, but also saves energy and improves production efficiency.
- It is simple to manage the building site's sanitation. Without the use of irritant cleaning chemicals, the powder that has adhered to the skin can be blown off with compressed air or rinsed away with warm water and soapy water.
Disadvantages of Powder Coating
- Powder coating resin must have a softening point above 80°C in order to be used. When powder coating is applied using the melting method, the melting and mixing temperatures are higher than the resin softening point, and the baking temperature during construction is higher than the manufacturing temperature. As a result, the baking temperature of powder coating is substantially greater than that of general coating, making it unsuitable for heavy machinery or heat-sensitive substrates.
- Changing the Colour and diversity of coatings is more difficult than changing the Colour and diversity of general coatings. When color changes are required frequently, the economics of powder coating production and construction suffers significantly, and cleaning between color changes takes a long time. Powder coating equipment manufacturers claim that the powder coating is suited for powders of the same type and color to function for an extended period of time.
- Powder coating equipment differs from ordinary coating equipment in that it cannot be utilized directly. New coating equipment and powder coating recycling equipment must be installed by users.
In general, based on the above advantages and disadvantages, powder coating equipment technology and equipment are becoming more and more mature. It will also inevitably progress toward more dependable automation, intelligence, low energy usage, and reduced pollution.
Powder coating equipment makers should continue to develop more beneficial powder coating equipment, prevent or overcome corresponding flaws, and fully exploit powder coating equipment's expanded function.
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