Patent ID: 8794950

Claim:
Heating device ( 10 ) for the transformation of a material ( 44 ), comprising: a lower mold element ( 12 ), or matrix, made of an electrically conductive material and comprising a molding zone ( 14 ) that is made of magnetic material and that is designed to be in contact with the material to be transformed; an upper element ( 20 ) that does not directly contact the material to be transformed and does not exert force on the material to be transformed, the upper element being made of a non-magnetic, electrically conductive material that has low electrical resistivity; inductor means ( 30 ) for generating a magnetic field arranged around a unit that is formed by the matrix ( 12 ) and the upper element ( 20 ); electrically insulating and transparent wedges ( 24 ) in the magnetic field, arranged between the matrix and the upper element and defining an air gap between opposing surfaces of said matrix and said upper element, wherein said air gap is maintained during heating and transformation of the material to be transformed, wherein the magnetic field circulates in the air gap and induces currents at the surface of the molding zone ( 14 ) of the matrix ( 12 ), thus making it possible to localize the action of the inductor means at the interface of the molding zone/material to be transformed; and deformable pressure means comprising a flexible membrane ( 42 , 46 ) in the air gap between the matrix ( 12 ) and the upper element ( 20 ), the flexible membrane being adapted to exert uniform pressure on the material to be transformed and to flatten the material to be transformed against the molding zone.