In lieu of the regulations issued by the government for reducing air pollution, industries are now using coatings that contain less organic solvent (volatile organic compounds or VOCs). These days, industrial paint equipment uses advanced application methods that improve transfer efficiency, reduce wastage and decrease efforts.
With transfer efficiency, it means the amount or percentage of coating material that actually coats the product versus that wasted in the form of overspray. High transfer efficiency not only helps meet environmental regulations and cuts costs but also it makes your workplace safe to work. Below are enlisted the basic methods used for applying paint in production installations.
Industrial paint sprayers can be classified into three categories, namely air, hydraulic or centrifugal. These general types have been further divided into conventional air-atomized, airless, air-assisted airless, air electrostatic, airless electrostatic, air-assisted airless electrostatic, high-volume low-pressure (HVLP), and rotating electrostatic disks and bells.
- Air Atomized Spraying – In the air atomized spraying technology, the paint under pressure is pumped into conventional spray guns so that it gets mixed with the stream of compressed air. The greatest asset of conventional air-atomized spray equipment is its versatility.
- Airless Spraying – In the airless spraying process, paint under pressure is made to pass through a small orifice in the gun, atomizing it in the same manner as a nozzle attached to a garden hose. It always lowers the viscosity.
- Electrostatic Spraying – Under the electrostatic spraying equipment, as the droplets pass through an electrode they become charged. But it has two disadvantages: First, the higher film builds on outside corners, edges and around cutouts. Second is the lower film build on inside corners and recesses.
- Airless Electrostatic Spraying – Under the airless electrostatic spraying, high-pressure hydraulic spray guns are used. They also charge the atomized droplets. Air-atomized electrostatic spraying improves transfer efficiency.
Under the non-spray methods, there are different methods such as dip coating, flow coating, centrifugal coating, roller coating and electrocoating.
- Dip Coating – In the dip coating products to be painted are immersed in a tank full of coating material. The excess of the paint is drained off in a solvent-saturated atmosphere and then it is dried or cured.
- Flow Coating – Flow coating overcomes some of the limitations of dip coating. The paint is pumped from a reservoir over the upper surfaces of the products through hoses and nozzles. The paint flows over and down thus covering the sides of the products.
- Centrifugal Coating – In centrifugal coating, firstly, the small parts are loaded into an inner basket. Thereafter, the tank is filled with sufficient coating material to cover the basket of parts, and then it is emptied. Also known as “dip-spin” coating it is used for finishing of small parts in large volumes.
- Roller Coating – For finishing flat sheets and coiled metals, roller coating is the extensively used method. When the substrate and rollers travel in the same direction and at the same speed, the method is called direct roller coating.
To achieve the higher efficiencies and more production, new and trending industrial paint sprayers are being used. These are more efficient methods as compared to the conventional methods and equipment. The Kremlin industrial paint equipment reduces the material costs and makes the coating process easier.