| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a soundproof pipe body for easily developing sufficient soundproof performance even when applying a fire-retardant sound absorbing material. <P>SOLUTION: A soundproof pipe 11 has a pipe body 12 and a sound shielding material 13 for covering the pipe body 12 at its periphery. A gap between the outer peripheral face of the pipe body 12 and the inner peripheral face of the sound shielding material 13 is formed as a sound absorbing layer 14. In the sound absorbing layer 14, a glass wool sheet 15 is arranged as the sound absorbing material. The density of the glass wool sheet 15 arranged in the sound absorbing layer 14 is 70 kg/m<SP>3</SP>or less. The fiber length of each of glass short fibers constituting the glass wool sheet 15 is 45 mm or smaller. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
