Fig. 2.5: Arc-type metal spraying system | With Spraying applications, the energy of the expanding compressed air is used to force materials or liquids through a spray nozzle. This procedure is used to apply or atomise various substances.
Surface treatment processes, such as sand and gravel blasting, shot peening and painting with spray-guns belong to this category. Concrete and mortar are also applied using this method.
If high temperatures are also used, compressed air can be utilised for applying liquid metals. Arc-type spraying is an example worthy of mention here..
Another application is the atomisation of liquids through spray nozzles, e.g., for spraying weedkillers and insecticides. |