Patent ID: 7052619

Claim:
Process for manufacturing printed circuit boards from an extruded polymer comprising the steps: preparing at least one plate ( 10 ) of electro-conductive material, carrying out a first selective engraving on a first side ( 10 a ) thereof so as to form several embossments ( 11 ) corresponding to future tracks and several depressions ( 12 ) corresponding to future inter-track areas; applying a dielectric substrate material, in a pasty or semi-pasty state, on said first side ( 10 a ) of the plate ( 10 ) of electro-conductive material, covering said embossments ( 11 ) and filling said depressions ( 12 ); and once said dielectric substrate material has hardened, carrying out a second selective engraving on a second side ( 10 b ), opposite the first one, of said at least one plate ( 10 ) of electro-conductive material so as to eliminate said dielectric substrate material thereof corresponding to said future inter-track areas, giving several finished tracks ( 13 ) isolated from each other by inter-track areas ( 14 ) and partially enclosed on one side by said dielectric substrate material, characterized in that said step of applying a substrate material comprises: obtaining by extrusion at least one first heated sheet ( 20 a ) of said dielectric substrate material from a thermal-plastic material; depositing said first heated sheet ( 20 a ) on said first side ( 10 a ) of the plate ( 10 ) of electro-conductive material; and subjecting the first heated sheet ( 20 a ) and plate ( 10 ) assembly to a predetermined pressure so that the dielectric substrate material completely fills said depressions ( 12 ) and encloses said embossments ( 11 ).