| abstract |
(57) [Summary] [PROBLEMS] To provide a sound-absorbing fiber structure which has no problem in recyclability and working environment at the time of production, has excellent sound absorption and sound insulation properties, and has good moldability. SOLUTION: A non-elastic crimped staple fiber and a polymer having a melting point lower by 40 ° C. or more than the polymer constituting the non-elastic crimped staple fiber are provided with a heat-adhesive conjugate short fiber disposed on the surface thereof as a heat-sealing component. Is 90/10 to 50/5 by weight 0, and the heat-adhesive conjugate short fibers are bonded together in a state where they intersect with each other and are heat-sealed. A fiber structure in which the attached fixing points are scattered, the fiber structure having an average density of 0.02 to 0.20 g / cm 3 And the total number of fibers arranged in parallel to the thickness direction of the fiber structure is defined as (B), and the fibers are arranged perpendicular to the thickness direction of the fiber structure. B / A is 1.5 or more, where (A) is the total number of |