Circuit-like metallic foil sheet and the like and process for producing them

A process for fabricating a circuit-like metallic foil sheet, said processing comprising:

• providing a predetermined circuit-like pattern on a metallic foil of a first laminate comprising a carrier sheet adhered thereto the metallic foil, by means of patterning using a stamping die;
• superposing on said patterned first laminate, a second laminate comprising a carrier sheet adhered thereto a metallic sheet being patterned by means of patterning using a stamping die;
• and
• heating only said circuit-like patterned portions from the carrier sheet side of either or both of the first and the second laminates, thereby forming circuit-like metallic foils on both sides of said support with hot-melt adhesive films being interposed therebetween.

A process for fabricating a circuit-like metallic foil sheet useful as a resonant tag comprising:

• providing, by means of patterning using a stamping die, a predetermined circuit-like pattern on a metallic foil of a first laminate comprising a carrier sheet having adhered thereto the metallic foil and having further thereon a hot-melt adhesive dielectric resin film;
• superposing on said patterned first laminate, a second laminate comprising a carrier sheet adhered thereto a metallic sheet having being patterned by means of patterning using a stamping die;
• and
• heating only said circuit-like patterned portions from the carrier sheet side of either or both of the first and the second laminates, thereby forming circuit-like metallic foils on both sides of said support with hot-melt adhesive dielectric resin films interposed therebetween.

A process for fabricating a circuit-like metallic foil sheet having utility as a resonant tag, said processing comprising:

• providing a predetermined circuit-like pattern on a metallic foil of a first laminate comprising a carrier sheet having adhered thereto the metallic foil, by means of patterning using a stamping die;
• superposing on said patterned first laminate, a second laminate comprising a carrier sheet having adhered thereto a metallic sheet being patterned by means of patterning using a stamping die;
• and
• heating only said circuit-like patterned portions from the carrier sheet side of either or both of the first and the second laminates, thereby forming circuit-like metallic foils on both sides of said support with hot-melt adhesive films being interposed therebetween to form a resonant tag.