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O: Fachverband Oberflächenphysik

O 71: Scanning Probe Techniques and New Experimental Methods

O 71.13: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Reprocessing with radial shock waves — Philipp Weil, •Robert Ossig, Hans-Günter Hloch, and Jürgen Bohnen — wfk - Cleaning Technology Institute, D-47807 Krefeld, Deutschland

We present a novel application to utilise radial shock waves as an effective, sustainable, hygienic and gentle method to clean sensitive surfaces (e.g. textiles). Usually, shock waves are used for medical applications, e.g. to break up kidney stones or to promote bone healing after complicated fractures. Radial shock waves are generated using the ballistic principle, where a small projectile is fired at high speed upon a metal applicator, from which radial shock waves expand into an homogenous medium (usually water). Directly behind the wave front peak pressures of up to 100 MPa and, thus, high energy input per area is achieved. While impinging on a surface, a part of the shock wave is reflected back into the water and interacts with the next impinging wave. This leads to high mechanical interactions directly at the surface, which explain the efficient destruction of kidney stones in soft tissue. In this contribution we discuss relevant interactions between shock waves, textiles and soils and present shock wave parameters (e.g. frequency, distance to surface) for optimum soil removal and minimum surface damage. Furthermore, a comparison of the new method with typical methods, which are in use today, are presented.