Corona effect surface treatment machine

for sheetsfor films and sheets

Where sheet metal (painted and unpainted) requires lamination or coating, adhesion is an important issue. Notably, in the production of sandwich panels, the sheet is treated with corona for better adhesion of the foam. Also when using foams with a higher flash point. In addition, bright sheet metal can be cleaned with corona pre-treatment. In contrast to plastic films, treatment rollers are generally not used in the corona treatment of metal sheet, as the grounded metal sheet is the counter electrode. This special unit has been developed in cooperation with one of the world’s largest sandwich panel manufacturers, and several are in long term production with proven reliability. oller pairs at the inlet and outlet of the station precisely define the distance between the metal sheet and the ceramic electrodes, preventing them from being damaged by warps in the metal sheet. The unit is fitted with special ceramic electrodes with stainless steel cores for durability in the hard mechanical process. Additional optional protection of the ceramic electrodes can be realized using a fast open system. A splice can detected via a signal from the line or by an interrupted laser beam which opens the station and closes it again after the splice has passed. The optimized extraction can prevent conductive particles from the sheet from causing flashovers on the electrodes which may lead to damage. The electrode holders have additional shields to protect against this occurring. To facilitate easy cleaning and simple exchange of the electrodes, the station is easily opened for access to the ceramic electrodes.