Method of Drying Polymer Paint and Varnish Coatings on Metal Parts (Descriptionof an Invention for an Author's Certificate)

摘要

The purpose of the invention is improving the quality of drying and acceleratingthe process. For this the heating is carried out at a rate of 30-60 deg C/h up to a temperature below the break-down temperature of a polymer by 10-15 deg C with a field strength of 2500-5000 Oe and relative humidity of the surrounding medium of an order of 65-80%, after which the parts undergo isothermal holding for 3-6 h and then are cooled at a rate of 20-40 deg C. Items made out of metal or other ferromagnetic material with the paint and varnish coating applied are placed into a chamber which is equipped with a solenoid-type winding made over the entire perimeter of the chamber, in which an electromagnetic field of a specific and same intensity of an order of 2500-5000 Oe is created. The winding is powered with a voltage of 220/380 V of industrial frequency current. When voltage is supplied an electromagnetic field is created, which due to the eddy currents and the effect of remagnetization causes the heating up of the part. The transfer of heat to the coating takes place conductively from the part itself. The temperature of the part is regulated by changing the magnitude of intensity of the electromagnetic field.