Patent ID: 7789196
Filing Date: 2010-09-07
Classification: B60R,G10K

Abstract:
1. A method of producing a sound-absorbing material, comprising the step of pressing a fiber mixture including matrix fibers and binder fibers, under heating, to form said fiber mixture into a given shape, wherein a type of said matrix fibers, a percentage of hollowness of said matrix fibers, a crimping rate of said matrix fibers, a forming temperature, a forming cycle time, and a ratio of said binder fibers to said entire fiber mixture, are adjusted to allow said sound-absorbing material to have a flow resistivity R of 3.3×10 4 N·s/m 4 or more, a Young's modulus E of 1.2×10 3 to 2.0×10 4 N/m 2 , and a loss factor δ of 0.12 or less