Blasting systems - joke Technology GmbH - #3

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486 7 Tel. +49 (0) 22 04 / 8 39-0 • Fax +49 (0) 22 04 / 8 39-61 • info@joke.de 7. Blasting systems // 7.1. Fine and pressure blasting units Injection blasting creates a negative pressure with a blasting gun, which sucks in the blasting shot via a separate supply line and guides it into the compressed air. The compressed air then accelerates the blasting shot up to its exit from the blasting nozzle. Injection blasting is particularly suited to achieve level small to medium-sized surfaces. This method allows very point-precise application (important for sensitive workpiece geometries). During pressure blasting, the blasting shot is pressurised to compressed air in an enclosed container (pressure tank) and then pressed through the attached blasting hose with blasting nozzle. Thanks to this long acceleration, the blasting shot achieves a much higher blasting and hit speed than with injection blasting. This method is particularly suited for blasting large areas and removing tough impurities. Extremely light (i.e. plastic, walnut shells) or heavy (i.e. high-carbon steel grain, metallic blasting shots) blasting shots can be used, which will not achieve the required hit speed or result in a long blasting process with the injection method. Injection and pressure blasting Injection blasting Pressure blasting