The injection system takes its name from the injector located in the jet gun. As soon as the compressed air starts to flow via the compressed air hose through the injector of the jet gun a negative pressure is created. As a result, blasting media is sucked in from the funnel, via a “discharge cup”. In the injector chamber, the drawn-in blasting media is mixed with the stream of compressed air. Via the nozzle of the blasting gun the blasting media travel at great speed to the surface to be blasted.
Which blasting methods are available?
Compressed air blasting
With compressed air blasting, a vessel of air and blasting medium are simultaneously pressurized and added to the air flow. This is a slightly more expensive solution, because of the vessel and some additional control valves and valves are required. Blasting medium falls into the compressed air flow by its own specific weight and is transported to the nozzle, where it is aimed at the product to blast the product. A main valve, filling cone, venting valve, blasting media valve and pump valve are present in the system.
With compressed air blasting, a relatively larger blasting media can be used for blasting with less air consumption. The efficiency of a compressed air system is higher, because a lot of energy is lost in an injection system when sucking in the blasting medium. In general it can be said that injection (or injector) systems are only used in case of:
- Very thin material thicknesses
- Relatively low production numbers are required
- Only very limited contaminants are present on the surface.
- If investments have to be made for very limited costs
Main PRO’s and CON’s of injection blasting vs compressed air blasting:
|Small and easy to operate equipment||Not suitable for all blasting media. (e.g. cast iron and steel or with a larger grain)|
|Rather low production numbers||Not suitable for removing mill scale, thick rust or paint layers|
|Lower sensitivity to moist compressed air|
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