Patent ID: 8197621
Filing Date: 2012-06-12
Classification: H05B,Y10T

Abstract:
1. A method of manufacturing a planar heating element comprising, the steps: forming a ground using a carbon micro-fiber mixed solution formed by mixing carbon micro-fibers having a length of 5-25 mm and a thickness of 20-100 μm with paper pulp, a water-soluble binder and water, preparing a carbon powder mixed solution by mixing 3-50% carbon powder with respect to the weight of the ground, 2-30% conductive polymer with respect to the weight of the ground, 1-5% water-soluble binder with respect to the weight of the ground and water, forming a conductive polymer layer by coating a conductive polymer on the ground including the carbon micro-fibers, manufacturing a planar heating sheet by impregnating and coating the carbon powder mixed solution on one surface or both surfaces of the ground including the conductive polymer layer and drying to form a carbon powder mixed layer, cutting the planar heating sheet including the carbon powder mixed layer to have a specified width and length, forming a silver electrode wire by coating a silver powder mixed solution, which is the silver powder mixed with the water-soluble binder and a diluting agent, so that the silver electrode wires are formed on opposite sides of an upper surface of the cut planar heating sheet, each silver electrode wire having a width of 10-25 mm and drying, forming a copper foil electrode wire by pressing the copper foil electrode wire having a thickness of 35-50 μm, a width of 10-25 mm and a length equal to the silver electrode wire, wherein a bottom surface of the copper foil electrode wire is coated with a conductive adhesive mainly containing a conductive polymer, on the silver electrode wire, and forming an insulating layer by coating a melted insulating material on the planar heating sheet including the silver electrode wire and the copper foil electrode wire and drying to form the planar heating element.