Flexible electric heater integrated in a fabric and process for making a flexible electric heater integrated in a fabric

A flexible electric heater integrated in a fabric, with a surface extending in a two-dimensional plane, comprising:

• at least one heating strip (1) parallel to fill threads, said at least one heating strip (1) being electrically connected to strips of electrically conducting wires (4), said strips of electrically conducting wires (4) arranged approximately parallel to warp threads, next to different portions of fabric (2), (3),
• wherein said at least one heating strip (1) comprises a plurality of electrically heating fill threads (11) intertwined with the fabric, each strip of electric conducting wires (4) comprising a plurality of electrically conducting warp threads (41) intertwined with the fabric, said plurality of electrically heating fill threads (11) being intertwined with said plurality of electrically conducting warp threads (41),
• wherein the strips of electrically conducting wires (4) form conducting bands, and wherein a warp density has a higher value than in a remainder of the flexible heater on a side of each conducting band and at a crossing of the conducting bands and the heating fill threads (11),
• wherein each of said electrically conducting warp threads (41) and of said electrically conducting fill threads (51) comprises strands in an amount included between a minimum of 2 and a maximum of 46 capillaries, sections of the capillaries being included between 0.03 mm and 2 mm, and
• wherein an amount of the electrically conducting warp threads (41) of each strip of electrically conducting wires (4) is between 3 and 48 threads.