Conductive nonwoven fabric
AssigneeCarl Freudenberg KG
InventorsWerner Schäfer, Kurt Jörder, Hans Rettig, Karim Salama, Achim Bock, Silke Wagener, Axel Helmbold
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Abstract
The invention relates to a conductive nonwoven fabric that is carbonized and/or graphitized and possesses a bending rigidity <8 taber, a density of 0.1 g/m3 to 0.5 g/m3, a thickness of 80 μm to 500 μm, and an electrical conductivity of 10 to 300 S/cm in the nonwoven fabric strip and 30 to 220 S/cm2 perpendicular to the nonwoven fabric strip.
Claims19
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/m2;
- 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/cm3 and 0.5 g/cm3, 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/cm2 perpendicular to the nonwoven fabric strip.
A conductive nonwoven fabric, including water soluble fibers, bonded only by hydrogen entanglement, containing at least one of carbonized and graphitized fibers, the conductive nonwoven fabric having a bending rigidity of less than 8 taber, a density of between 0.1 g/cm3 and 0.5 g/cm3, a thickness of between 80 μm and 500 μm, and an electrical conductivity of between 10 and 300 S/cm in a nonwoven fabric strip and between 30 and 220 S/cm2 perpendicular to the nonwoven fabric strip obtained by laying up preoxidized fibers as a precursor stage for carbon fibers to form a fiber sheet having a mass per unit area of 30 to 300 g/m2, bonding the fiber sheet by high-pressured fluid jets at pressures of 100 to 300 bar, compression of the bonded nonwoven fiber fabric by calendaring by 50 to 90% of its starting thickness, and at least one of carbonization and graphitization under an inert gas atmosphere at 800° C. to 2500° C., wherein the water-soluble fibers include two different water-soluble fibers, one of the two different water-soluble fibers being water-soluble at temperatures of between 10 and 40° C. and another of the two different water-soluble fibers being water-soluble at temperatures of between 80 and 120° C.
A conductive nonwoven fabric, including water soluble fibers and one of carbonized and graphitized fibers, the conductive nonwoven fabric having a bending rigidity of less that 8 taber, a density of between 0.1 g/cm3 and 0.5 g/cm3, a thickness of between 80 μm and 500 μm, and an electrical conductivity of between 10 and 300 S/cm in a nonwoven fabric strip and between 30 and 220 S/cm2 perpendicular to the nonwoven fabric strip wherein the water-soluble fibers include two different water-soluble fibers, one of the two different water-soluble fibers being water soluble at temperatures of between 10 and 40° C. and another one of the two different water-soluble fibers being water-soluble at temperatures of between 80 and 120° C., wherein the nonwoven fabric is bonded only by hydroentanglement.
A conductive nonwoven fabric one of carbonized and graphitized fibers, the conductive nonwoven fabric having a bending rigidity of less than 8 taber, a density of between 0.1 g/cm3 and 0.5 g/cm3, a thickness of between 80 μm and 500 μm, and an electrical conductivity of between 10 and 300 S/cm in a nonwoven fabric strip and between 30 and 220 S/cm2 perpendicular to the nonwoven fabric strip wherein the conductive nonwoven fabric is produced by mixing a plurality of preoxidized carbon fibers with up to 30 wt. % of a plurality of water-soluble fibers having fibers titers of between 0.5 and 6.7 dtex, laying up the preoxidized carbon fibers and the water-soluble fibers to form a fiber sheet having a mass per unit area of between 30 and 300 g/m2, bonding the fiber sheet using high-pressure fluid jets at pressures of between 100 and 300 bar, compressing the fiber sheet by between 50% and 90% of a starting thickness of the fiber sheet by calendaring, and one of carbonizing and graphitizing the fiber sheet in an inert gas atmosphere at between 800° C. and 2500° C. wherein the water-soluble fibers include two different water-soluble fibers, one of the two different water-soluble fibers being water-soluble at temperatures of between 10 and 40° C. and another one of the two different water-soluble fibers being water-soluble at temperatures of between 80 and 120° C., wherein the nonwoven fabric is bonded only by hydroentanglement.
A conductive nonwoven fabric, including two different water soluble fibers, bonded only by hydrogen entanglement, containing at least one of carbonized and graphitized fibers, the conductive nonwoven fabric having a bending rigidity of less than 8 taber, a density of between 0.1 g/cm3 and 0.5 g/cm3, a thickness of between 80 μm and 500 μm, and an electrical conductivity of between 10 and 300 S/cm in a nonwoven fabric strip and between 30 and 220 S/cm2 perpendicular to the nonwoven fabric strip obtained by laying up preoxidized fibers as a precursor stage for carbon fibers to form a fiber sheet having a mass per unit area of 30 to 300 g/m2, bonding the fiber sheet by high-pressured fluid jets at pressures of 100 to 300 bar, compression of the bonded nonwoven fiber fabric by calendaring by 50 to 90% of its starting thickness, and at least one of carbonization and graphitization under an inert gas atmosphere at 800° C. to 2500° C. wherein a ratio of the water-soluble fibers relative to one another is 3:1 through 1:3.
A conductive nonwoven fabric, bonded only by hydrogen entanglement, containing at least one of carbonized and graphitized fibers, the conductive nonwoven fabric having a bending rigidity of less than 8 taber, a density of between 0.1 g/cm3 and 0.5 g/cm3, a thickness of between 80 μm and 500 μm, and an electrical conductivity of between 10 and 300 S/cm in a nonwoven fabric strip and between 30 and 220 S/cm2 perpendicular to the nonwoven fabric strip obtained by laying up preoxidized fibers as a precursor stage for carbon fibers to form a fiber sheet having a mass per unit area of 30 to 300 g/m2, bonding the fiber sheet by high-pressured fluid jets at pressures of 100 to 300 bar, compression of the bonded nonwoven fiber fabric by calendaring by 50 to 90% of its starting thickness, and at least one of carbonization and graphitization under an inert gas atmosphere at 800° C. to 2500° C., wherein the fabric is comprised of at least two layers having different pore sizes, wherein fibers of the layers possess different titers.
Dependencies are inferred from the claim text.