Brush rollers - Import export

Standard advantages: RTS-Rotation – low-maintenance dry spray booth Overspray dry separation demonstrates its strengths in practice above all when relatively large quantities of paint have to be processed and the overspray portion cannot be reduced any further. Spray booth with dry separation are usually equipped with disposable filters or manually regenerative filters. These cause costs for spare filters, maintenance and disposal. In addition to that, operation has to be interrupted in order to exchange the filters. The ‘RTS rotation’ system was developed by Rippert in order to reduce these costs and tooling times. Maintenance intervals and filter service lives are prolonged significantly in comparison with conventional systems due to the new brush pre-filtration. How the ‘RTS-Rotation’ system works Overspray separation in the RTS-Rotation system takes place by means of a pre-filter and a fine filter stage. The pre-filter stage is formed by vertical, slowly rotating brush rollers. The bristles present a very large total surface area and absorb the adhesive particles from the overspray. During the slow rotation, the paint particles can dry on the tips of the bristles. This results in slowly growing cakings on the bristles. Scrapers are mounted in the area behind the brush rollers that continuously remove these cakings from the bristles. The dislodged, hardened material falls into the drawers arranged under the brushes and can thus be simply disposed of. The dry paint dust may often be disposed of as ‘commercial waste’. The brushes otherwise require little maintenance and do not need to be exchanged or renewed. The fine filter stage is formed by a special fleece filter, which is arranged above the brush rollers and must be manually maintained or exchanged in the standard version. The maintenance intervals depend on the paint material used. Automatic cleaning or an external fine filter with automatic cleaning is also possible as an option. Over 10 years of operational experience shows that around 75 to 95% of the overspray is separated out by the pre-filter stage and the rest by the fine filter stage. The degree of separation depends strongly on the type of paint and the drying reactivity during the flying phase. Use of the RTS-Rotation with the following paints Before practical use, the paints are tested and approved in Rippert’s own pilot plant. Stove enamels and 100% UV paint systems cannot be used. The horizontal version Furthermore, it is possible to use the system as a horizontal underfloor extraction system. This version is used, for example, by a machine manufacturer for large parts. In addition, a drag conveyor with gulley extraction is used there in order to automatically transport the particles cleaned off the brushes out of the pit. Conclusion The RTS-Rotation system is particularly useful when relatively large quantities of paint with an unavoidable overspray portion have to be processed, as otherwise a great deal of residual waste would result using conventional technology. Compared to water-sprinkled spray walls and normal dry spray booths the amortisation period is shorter; it is frequently less than two years.

With high-quality filter tubes and PTFE diaphragms. Paint dust filters Wet painting also results in overspray. Overspray is the solid portion of the paint that is not taken up by the workpiece. According to the purpose of use, the overspray is moist and sticky immediately after release. It is captured by the exhaust air stream in the spray booth and fed to a filter. This can be, for example, a baffle plate filter, paper filter, fleece filter, glass fibre filter or also combinations of these. The adhesive effect causes the paint particles to adhere to the contact surfaces of the respective filter medium, as a result of which a good degree of separation is achieved. However, all these filters are storage filters, i.e. the filters clog up more and more during operation and cannot be regenerated. A filter exchange becomes necessary if the exhaust air rate of the spray booth falls below the minimum. This can be very time-consuming under certain circumstances and the work process must be interrupted in order to do it. To make things worse, not only must the filtered and bound paint residues be disposed of, but also the actual filter materials. Such tooling times are not justifiable for automatic, continuous or multi-layer painting processes. Continuous procedures such as automatically cleaned filters are likewise required for this. The humidity and the adhesiveness of the particles to be filtered are thereby the problem. In order to solve this problem, the paint particles should be relieved of their adhesive capability as far as possible whilst still inside the paint booth. Our patented ‘RTS-Rotation’ system is outstandingly well suited for this. The system is comprised of slowly rotating brush rollers, which take up the adhesive paint particles on the surface of the bristles and allow them to dry there. The bristles are automatically regenerated at pre-specified time intervals by combing devices that swing in at the rear of the brush rollers. The dislodged paint residues can then be removed and disposed of either manually during work breaks or automatically during operation. The degree of separation of this system is, however, insufficient to satisfy the environmental protection requirements concerning residual dust content in the exhaust air. A further filter stage is necessary for that. It must be assumed that the paint particles arriving here are to a certain extent still damp and sticky. For this we use special paint dust filters with high-quality filter tubes with PTFE diaphragms. If necessary, precoating agents (auxiliary dust) are used in order to neutralise the adhesive capability of the particles and to keep the dust layer on the filter elements permeable to air. The precoating agent is injected into the raw air pipe by means of special dosing units. The filter tubes are cleaned by means of compressed air impulse cleaning. The use of this technology requires special know-how. We have had the appropriate experience for almost ten years. The implemented plants have capacities ranging from 5,000 to 90,000 m³ /h. Because of the large number of different paint systems, individual experiments are usually necessary in our pilot plant in order to find the correct solution for the individual case.