Enameling Technology

The potential of the powder coating process has been investigated using a low-temperature powder coating which has been specifically developed for this purpose. In practice, quality standards for high-grade domestic furniture have yet to be achieved. On the basis of results obtained, however, the development of an effective coating process may be anticipated in the near future. Expand…

In the light of the heat-sensitivity of timber products, UV-hardened low-temperature powdered resins have been developed and tested in the laboratory. It has been possible to demonstrate the suitability of powder coating as a process for the surface finishing of timber and furniture. The transferability of this process to a semi-industrial scale has been confirmed. Expand…

The use of a low-ion coating method to improve the efficiency of the coating process has allowed the unnecessary application of surplus lacquer to be avoided, together with the heavy consumption of the powder coating material. At the same time, solvent emissions have been reduced. This method has now been incorporated into general powder coating technology, and is applied in the industry as standard. Expand…

Quality variations in powder coating systems are frequently attributable to the increased fineness of recirculated overspray powder. This problem can be effectively countered by the use of a fine-grain reduced powder in the first instance, the selection of appropriate separators and the application of suitable process control in the coating procedure. Expand…

It was possible to synthesise polymers that are suitable for use as binders for acrylic powder paints by using radical polymerisation in a homogenous phase with hypercritical carbon dioxide. They can subsequently be mixed with other powder paint components in hypercritical carbon dioxide without previous isolation. Expand…

The innovative process developed by the project facilitates surface-area spraying of component surfaces with varying test liquids. The resulting wetting patterns are optically recorded and evaluated with the aid of computers. This measurement method facilitates rapid quality testing of large polymer and metal component surfaces. The resulting increased production reliability and reduced scrap rate save energy and material resources. Expand…

This brochure presents a new process design for the production of powder coatings. In this method, organic solvents are completely replaced by environmentally neutral supercritical carbon dioxide, thereby improving the formulation of coatings and allowing powder coatings to be applied by spraying. This process is suitable for continuous operation, and is associated with a reduction in plant expenditure. Further information is contained in the German language brochure.

The recovery may vary depending on the type and composition of the varnish waste sludges. In general, however, the coagulants are thickened, then solved or dispersed, as well as released from rough impurities and separated by means of a plate centrifuge into a bonding agent phase and a pigmentpaste. By appropriate formulations the bonding agent phase and pigmentpaste can be converted into new varnish and/or be used as raw materials for varnish production. The best results were obtained in the processing of varnish coagulants of one type and color. The worst ones in mixed coagulants of different resin types and colours (further information in German). Expand…

To date, it has only been possible to recycle overspray from the base coating of vehicles as an energy source. By the use of thin-film evaporation/ultrafiltration it has been possible to recover overspray for the first time, and to process the recovered material into a modified water-based filler for use as a functional coating. The recycled water-based filler has satisfied quality requirements, and is also suitable for recycling. Expand…