NONWOVEN FABRIC AND COMPOSITE SOUND-ABSORBING MATERIAL USING SAME AS SKIN MATERIAL

• Main Authors: KATO, Kazufumi, TANAKA, Tomoya, YAMAMURO, Shinya, OKAMURA, Chie, SAITO, Junki, ISONO, Yasushi, OBI, Rumina
• Format: Patent
• Language: English; French; German
• Published: 13.01.2021
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; BRAIDING; COTTON-WOOL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; KNITTING; LACE-MAKING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; NON-WOVEN FABRICS; PERFORMING OPERATIONS; PHYSICS; SOUND-PRODUCING DEVICES; TEXTILES; TRANSPORTING; TRIMMINGS; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR; WADDING

Provided is a nonwoven fabric and a laminated nonwoven fabric suitable as the skin material of a composite sound-absorbing material. The nonwoven fabric and laminated nonwoven fabric are easily formable, thin, and lightweight and excel in form stability, and can nevertheless be controlled within a given range of aeration after being formed into shape. A nonwoven fabric having a laminate structure in which at least one ultra-fine fiber layer (M) having an average fiber diameter of 0.3 to 7 µm (inclusive) and a basis weight of 1 g/m2to 40 g/m2(inclusive) and at least one continuous filament layer (S) having an average fiber diameter of 10 to 30 µm (inclusive) are integrated together by partial thermocompression bonding, the nonwoven fabric being characterized in that the continuous filament layer (S) is constituted by a filament containing 97.0 to 99.9 wt% (inclusive) polyester (component A) and 0.1 to 3.0 wt% (inclusive) thermoplastic resin having a glass transition temperature of 114 to 160 °C (component B), and/or a filament having a birefringence index of 0.04 to 0.07 (inclusive), and the bulk density of the ultra-fine fiber layer (M) is 0.35 g/cm3to 0.70 g/cm3(inclusive), as well as a laminated nonwoven fabric of the nonwoven fabric and a composite sound-absorbing material in which the nonwoven fabric or laminated nonwoven fabric and a continuous foaming resin foam or porous fiber material are laminated.