Session 26: Production Technology
Chair: Kirsten Wrede, Vincentz Network, DEImproving coatings is not only a matter of raw material innovations. In a time of tight margins and stiff competition, a constant control and optimisation of the production process is of paramount importance. The six papers of this session are dedicated to the latest developments on production process improvement including dispersion technology, milling and grinding as well as analysis of nanoparticles and dosage of high viscosity adhesives.
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Wednesday Afternoon 14:00 – 17:00 h
Room St. Petersburg
26.1 14:00 – 14:30 h Nanoparticles for coatings with novel dispersion technology Dr. Ludger Fischer, Serendip, CH In the vast majority of applications that are related to the coating industry, the aggregation state of particles is an important issue for product quality. Therefore, efficient dispersion technologies for producing fine dispersions are required and gained additional attention after the outstanding properties of nanoparticles became obvious. Indeed, sufficiently small particle size not only leads to an enhanced stability of the generated products. When particles in coating products are efficiently dispersed, the abrasion- and scratch resistance are enhanced and optical properties such as brilliance are improved. Consequently, the technological development for the production of finely distributed particles is a challenging engineering task and all know-how points towards the importance of an efficiently constructed dispersion device with proper micro-scale geometry. In fact, a homogenizer containing such a micro-scale device needs to fulfil several qualifications. On the one hand, the device must have a geometry permitting an energy input sufficient for nanoparticle generation. On the other hand, product-specific aspects such as heat sensitivity have to be respected, even though these requirements often thwart a simple dispersing process. Finally, the efficiency of a homogenizer is also determined by economical key data, particularly energy consumption in times of steadily increasing energy costs and requirements in terms of environmental sustainability. In this presentation, the focus will be on the potential of a new generation of homogenizers, the so-called Low Pressure Nanogenizer (LPN). The LPN technology is capable of accommodating these requirements and represents a promising alternative to conventional high pressure homogenizers and bead mills.  | ||
| 26.2 14:30 – 15:00 h Screenless agitator bead mill for the use of smallest grinding media Dr. Stefan Mende, Netzsch-Feinmahltechnik, DE The company NETZSCH-Feinmahltechnik GmbH is a renowned manufacturer of machines and plants for grinding, dispersing and mixing of solids in liquid and pasty products. For the comminution down to the nanometer size range or for the dispersion of nano-sized particles the use of finer and finer grinding media is necessary. Furthermore for the avoidance of changes in the crystal structure of the product smooth conditions for `Mild Dispersion` processes are very important. With the new agitator bead mill developed by the NETZSCH-Feinmahltechnik GmbH a very well separation of grinding media with diameters down to 50m is possible even for low stirrer tip speeds. From experience we know that in particular nanotech-nology applications often call for metal-free grinding or dispersion. For these applica-tions we have developed a special grinding media separator system called ODC (Open Dynamic Classifier). The contribution discusses the differences between real comminution, desagglom-eration and disaggregation processes by the use of real experimental results. Fur-thermore the advantages of the innovative new ODC-System will be explained. | ||
| 26.3 15:00 – 15:30 h Size distribution determination of nanoparticles and nanosized pores by small-angle X-ray scattering Dr. Joerg Bolze, Panalytical, NL We present the small-angle X-ray scattering technique for the investigation of crystalline and amorphous materials on a mesoscopic length scale ranging from ca. 1 - 100 nm. Dry powders or dispersions of inorganic and organic nanoparticles can be characterized with respect to their particle size distribution, specific surface area and inner structure. In case of porous materials the specific inner surface area and pore size distribution may be determined. Compared to BET and light scattering techniques, the method is fast and no specific sample preparation is required. It has a very good precision in particular also for very small particles and pores with a size below 10 nm. Automation for routine production control measurements in the lab is possible on an X-ray diffractometer platform. Application examples for the characterization of photocatalytic nanoparticles, porous nanopowders, nanocomposites and core-shell polymer emulsions will be discussed. 15:30 – 16:00 h Networking: Refreshments & Coffee Break | ||
| 26.4 16:00 – 16:30 h The using of a coriolis flow meter for the dosage of high-viscosity adhesives Stefan Bischof, ISF Welding, Aachen University, DE A regulated application of an adhesive is technically necessary and indispensable. Changing viscosity and compressibility of the adhesive cause under - and over -dosages. The Conditions for control are concerning both the quality and the speed the temporally high resolved and low-loss collection of the actual flow. In this project a contactless coriolis measurement system for the automated application and dosage of high viscosity adhesives has been investigated. The system has the advantage that the mass and not the volume is measured. Moreover, the density can be measured independent of the temperature and the pressure. It is shown, that a coriolis flow meter can be used to give the actual value for a control-loop for the mass flow of high viscosity adhesives. Comparisoning this procedure to conventional volumetric flow rate measurement gearwheel system, the pressure loss is lower at the same metering precision. | ||
| 26.5 16:30 – 17:00 h Characterization of shear stress simulation of liquid polymers with resource measurement methods Sascha Buchbach, Fraunhofer Institute for Manufacturing Technology and Applied Materials Research, DE Improvement of coating processes usually means the qualification and implementation of new materials or new equipment. The installation of circulation lines for paint supply in the paint booth raises a couple of questions: - Are the paints suitable for this kind of paint-supply? - How long can the paint stay in the circulation line? - Can changes in the rheological behaviour or the colourshade occur through the permanent shear-stress? To answer those questions, a test circulationline has been developed and, together with experts in fluidics, the shear-stress that is applied on the paint has been calculated for the different components of the test line. In this way it is possible to do relevant tests with only 1 Kilograms of paint and the results can be applied on any industrial circulationline. | ||
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