Zusammenhang von Adhäsion und Reinigung von Mikropartikeln auf strukturierten Oberflächen

Adhesion of microparticles to surfaces is important for a number of industrial applications. Currently it is assumed that the adhesion between particles and surface needs to be resolved for a successful removal of unwanted particles in a cleaning process. It is supposed that the ability to remove particles from the surface correlates directly with the adhesion force measured by atomic force microscopy. Experiments are conducted with silicon‐ and stainless steel probes with various surface structures. An evaluation of the factors influencing adhesion and cleanability is performed.     

Reinigbarkeit von Oberflächen in der Lebensmittelindustrie durch Flüssigkeitsstrahlen

The influence of properties of product contact surfaces on cleanability is widely discussed in the food processing and pharmaceutical industry. In the present work stainless steel surfaces of different surface roughness, surface energy and electrokinetic properties were subject to organic soiling in order to study the influence of surface properties on cleanability. As food model test soils gelatinized starch and whey protein were chosen. The cleaning was realized by means of water jets from a flat fan nozzle.     

Experimentelle Untersuchung zur Foulingneigung einer Polymerdispersion auf modifizierten Oberflächen

Fouling is economically and ecologically a key problem for the efficiency for production and processing of polymer dispersions. In this study, the fouling behavior of polymer dispersions on heated and cooled surfaces was investigated. Therefore, the dependency of the fouling on operational parameters (heat flux density, bulk temperature, concentration of solid, flow regime) and properties of the apparatus (surface modification, coating) was studied. Electropolished surfaces and certain sets of operational parameters were identified as fouling mitigating and easier to clean, respectively.     

Berechnung der Haftung von Pulverpartikeln an strukturierten Oberflächen

The adhesion of powder particles on solid surfaces is influenced by many parameters. Among these influence factors the van‐der‐Waals‐forces and the humidity of the surrounding atmosphere play a dominant role. Since current models often neglect important parameters, in this paper different possibilities to calculate particle adhesion forces are presented. The calculated values allow the interpretation of adhesion force distribution and the assignment of adhesion forces to certain mechanisms.