Method of Drying Polymer Paint and Varnish Coatings on Metal Parts (Description of an Invention for an Author's Certificate)
FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT-PATTERSON AFB OH
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The inventions relates to methods of drying paint and varnish coatings which have been applied to metal parts by means of inductive heating in an electromagnetic field. The purpose of the invention is improving the quality of drying and accelerating the process. For this the heating is carried out at a rate of 30-60 deg Ch 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 220380 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.
- Coatings, Colorants and Finishes
- Manufacturing and Industrial Engineering and Control of Production Systems