Patent ID: 7815887

Claim:
A method for producing conductive nonwoven fabric strip, bonded only by hydroentanglement, containing at least one of carbonized and graphitized fibers, the method comprising: forming a fiber sheet of preoxidized fibers having a mass per unit area of 30 to 300 g/m 2 ; bonding the fiber sheet by high pressure jets at pressures of 100 to 300 bar; compressing the bonded nonwoven fiber fabric by calendaring by 50 to 90% of its starting thickness; carbonization and/or graphitization of the bonded non-woven fabric under an inert gas atmospheres at 800° C. to 2500° C. to thereby form a conductive nonwoven fabric; said nonwoven fabric having a bending rigidity of less than 8 taber, a density of between 0.1 g/cm 3 and 0.5 g/cm 3 , a thickness between 80 μm and 500 μm and an electrical conductivity of between 10 and 300 S/cm in the nonwoven fabric strip and between 30 and 220 S/cm 2 perpendicular to the nonwoven fabric strip.