Patent ID: 8715787
Filing Date: 2014-05-06
Classification: C23D

Abstract:
1. A method of making a compact layer of enamel coatings on moulded metal products by applying enamel layers in the form of powder in an electric field and subsequent firing, the method comprising: a layer of ground coat enamel in the form of powder is applied on the cleaned surface of a metal product in the electric field by application guns until a thickness of the layer reaches 100 to 150 μm, and subsequently the electric field is interrupted in order to reduce a space charge around the metal product, and a minimum of two layers of cover coat enamel powder are applied until a total layer of enamel powder reaches a minimum thickness of 750 μm, wherein the electric field is interrupted each time between each of the steps of cover coat enamel powder application, wherein the interruption of the electric field around the metal product is carried out by moving the product to another application position.