Continuous dryer for rapid drying of coatings on heating elements intended for washing machines or dishwashers, for example
The customer required us to fit our oven into a limited space and integrate it into the entire production line. He specified a minimum length for the dryer, but with the understanding that we had to maintain a production cycle of 60 seconds. So we designed a continuous dryer SP 950/02 with powerful circulation to be able to heat the batch quickly and at the same time achieve the required temperature distribution of +/- 7 °C directly on the parts.
Structurally, it is a continuous drying oven with a chain conveyor, which we have fitted with special holders for storing the charge, i.e. resistance heating elements. After the coating has dried, the charge is cooled in the cooling zone, which is connected to the furnace. Thanks to the imaginative design of the size of the cooling fan and the exhaust fan, we managed to balance the ratios of the sucked and extracted air in the cooling zone while maintaining the cooling speed and the minimum temperature of the part at the outlet from the furnace.
Due to the robot that handles the batch before and after the thermal process, it was necessary to ensure a smooth and continuous operation of the conveyor. It had to move and stop precisely and smoothly, without jolts. We managed to achieve a positioning accuracy of the conveyor of +/- 1 mm. Since the impregnation coating contains flammable volatile substances, the furnace is also equipped with a METREX sensor that monitors the level of volatile substances in the internal atmosphere.