This application of powder coatings is the most popular, and most widely known, process method. A spray gun charges the powder as it exits the gun towards a grounded, room temperature, workpiece. The powder clings to the surface of the part because of the static electrical charge as it enters a curing oven. With the addition of heat, the coating melts to a thin, highly dense, cross linked polymer that is very durable, looks great, and lasts a long time. Standard thicknesses achieved in this process are .001” – .004”. For thicker coverage, the same equipment can be used to spray the powder onto a hot substrate (also known as flocking). Because the powder begins to melt on flow on contact, thicknesses up to .030” can be achieved. These methods of application can be used for a wide variety of powder materials that include Polyester, Epoxy, Nylon, Halar, Polyolefin, Polyethylene, and hybrids.
When people talk about powder coating, they often mean electrostatic spray coating which is one method of applying powder coating. Versatile, durable, and cost-effective, powder coating is designed to protect, beautify, and prolong the life of the products it coats. Here are some common questions and their answers about electrostatic spray coating.
In brief, the electrostatic spray coating technique typically involves a few basic steps:
While electrostatic spray coating and painting are similar techniques and the terms are sometimes used interchangeably, they feature two key differences:
Because of the incredibly strong electromagnetic bond formed between the coating and substrate, powder coating is exceptionally durable, resilient, and long lasting. Fast and cost-effective, it's an ideal solution to protect vulnerable metal.
In general, any products which can safely tolerate the heat required are suitable for spray powder coating. Alternative methods, such as fluidized bed techniques, may produce better results for products with complex shapes or structures that may produce Faraday cage effects or create other barriers to complete coverage.
Electrostatic powder coating is quite eco-friendly, requiring no volatile organic compounds (VOCs) or solvents to apply, and generally producing virtually no waste, including no hazardous waste.
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