| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric corrugated tube superior in strength and the muffling effect to intake pressure while having proper softness and flexibility, and having versatility usable for various filters and covering materials including an intake duct of an internal combustion engine. <P>SOLUTION: This nonwoven fabric corrugated tube 101 is constituted by spirally revolving belt-like nonwoven fabric P around the axis, and also forming a cylindrical shape by partially superposing and joining belt-like nonwoven fabric P<SB>n</SB>, P<SB>n+1</SB>. etc. of the next periphery in the width direction on and to belt-like nonwoven fabric P<SB>n-1</SB>, P<SB>n</SB>, etc. of its respective peripheries. The belt-like nonwoven fabric P<SB>n-1</SB>, P<SB>n</SB>, etc. of the respective peripheries are shaped in a waveform including at least a set of projection strip part 2a and groove strip part 2b parallel to its longitudinal direction, and are formed in a waveform of continuous spiral arrangement of a peripheral wall part by being mutually joined by a joining part (2c-2d) parallel to its waveform. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
