Patent ID: 7800020

Claim:
Manufacturing process of a heating plate for a hair straightening iron, characterized in that it is developed following these stages: 1) Preparation of the ceramic powder which comprises the milling of dispersants and adding of solvents, the mixing with the binding agent and adding of plasticizer; a viscosity control of the result is made, and then 2) there follows the molding and corresponding drying; 3) the plates are cut and the resistor is screen printed; 4) the whole is laminated by pressure and then cut; 5) after that the binding agent is burnt and a sintering is performed; it is finished with 6) the welding of the contact terminals, and an eventual polished layer for coating purposes, further characterized in that during the first stage, the mixture is prepared in liquid state in order to build the substrate layer of the resistor, where the ceramic element used is alumina in powder with a PVC-type binding agent, some other element is conveniently added so as to get a good base, and once the optimum viscosity is controlled, the “green layer” (material without thermal treatment) is prepared in order to make the plates on which the band to form the resistor will be printed.