Influence of surface structure on the cleanability of surfaces
Special Symposium - Innovations in Food Technology (LMC Congress)
Process & Product Innovation (Food-4b)
Keywords: surface topography
U. Bobe1), K. Sommer1), U. Beck2), G. Reiners2), W. Peukert3)
1)Lehrstuhl für Maschinen- und Apparatekunde, TU-Munich, Freising-Weihenstephan, Germany
2)Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
3)Institute of Particle Technology, University Erlangen, Germany
In former research experiments had been done to investigate the effect of a surface topography / topometry on its cleanability [1,2]. These experiments had been carried out with single particles (spherical) and single living organisms (spherical and elliptical) and showed no dependence of the cleaning result on the surface roughness. This fact leads to the theory that there is a huge variety of roughness structures on a realistic surface which are dominating the adhesion force rather than the size of the roughness. Figure 1 shows that the van der Waal force differs in orders of magnitude for different roughness structures (e.g. factor > 106 for technical roughnesses Ra > 0,1 m).
Next to the cleaning of single particles the effect of crosslinked contaminations like colloids and surface foulings on th cleaning efficiency will be presented. The influence of different structures of surface topography will be shown and if there is an structure-dependent effect on the cleaning similar to the Lotus-Effect® (which doesn’t work in the immerged system).
