Clean coating without biocides
Physical high-voltage process enables the biocide-free sterilization
Exhibitors
Location
Hall 11, Stand B06
Description
Before car bodies or metal goods receive their coat, they undergo a multi-stage pre-treatment process. A key process step is electrophoretic dip coating, in which water-based paints are applied electrochemically. Microorganisms can multiply in the process liquids and paints to such an extent that they can significantly impair the quality of the paint and therefore the coating. To date, chemical biocides have often been used to reduce germs, but these often pose risks. Careful monitoring, special management, extensive protective equipment, specific storage areas and staff training are required. There is also a risk of bacterial resistance developing. A physical alternative has been developed at the Institute for High Power Pulse and Microwave Technology at KIT: electro-pulse treatment based on bipolar high-voltage pulses. In this process, microorganisms are exposed to an intense electrical field that polarizes the cell membrane and ultimately leads to the death of the microorganisms. As this is a purely physical process, there is no risk of resistance developing. The process does not require any chemical additives and therefore enables sustainable, effective sterilization of the process liquids. The decisive factor is the use of extremely short, bipolar voltage pulses with symmetrical charge distribution. This prevents ions such as hydroxide or oxonium ions from accumulating on the electrodes and leading to paint deposition or unwanted electrode coating – a common problem with conventional unipolar electro-pulse processes. The process is ideal for use in modern paint shops in the automotive and metal industries, which can be retrofitted accordingly. Maintenance costs are reduced and operating costs lowered. The entry of biocides into waste water is completely avoided.
You can get an overview of this technology at KIT stand. More details can be exchanged individually with the responsible scientific employees of KIT after the industry fair.
Contact
Karlsruher Institut für Technologie (KIT)
- Kaiserstr. 12
- 76131 Karlsruhe
- Germany
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