| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sound-deadening duct arranged under the roof etc. of a house, used for indoor ventilation, capable of effectively absorbing noise generated from an air sending source and sound of a wind made to flow within the duct and having excellent heat insulation property. <P>SOLUTION: A reinforcing strip body 3 is spirally wound around the outer circumferential surface of a duct inner wall 1 made of nonwoven fabric including an infinite number of fine ventilation holes 2, a string-like buffer heat insulating strip material 4 is wound on the reinforcing strip body 3, an independent foaming synthetic resin belt material 5A is disposed between upper surfaces of adjacent buffer heat insulating strip material parts, at the same time, opposite side edge surfaces of the adjacent independent foaming synthetic resin belt material parts are integrally connected, thereby, a tubular duct outer wall 5 is formed, and a space part 7 formed between the duct inner wall 1 and the duct outer wall 5 is enlarged by the reinforcing strip body 3 and the buffer heat insulating strip material 4 arranged on the reinforcing strip body 3 to effectively absorb a sound. <P>COPYRIGHT: (C)2012,JPO&INPIT |
