Title:
INORGANIC-FIBER CONTAINING MAT AND NOISE REDUCTION STRUCTURE FOR EXHAUST PIPE
Document Type and Number:
WIPO Patent Application WO/2020/217863
Kind Code:
A1
Abstract:
The present invention provides a new inorganic fiber-containing mat that achieves sufficient noise reduction for low-frequency sound particularly at 1 kHz or less and has excellent heat resistance and heat insulation even if the mat is thin. The inorganic fiber-containing mat comprises, as a substrate, an inorganic-fiber compact that is made of an inorganic-fiber needle work having an air-flow resistance of 0.7-1.5 kPa∙s/m and a thickness of 5-30 mm. On the surface of the inorganic-fiber compact, needle working holes with a pore diameter of 0.05-0.70 mm preferably account for 80-100% of all needle working holes.
Inventors:
MORIKAWA SHU (JP)
MORI TADASHI (JP)
MORI TADASHI (JP)
Application Number:
PCT/JP2020/014394
Publication Date:
October 29, 2020
Filing Date:
March 27, 2020
Export Citation:
Assignee:
NICHIAS CORP (JP)
International Classes:
D04H1/4209; D04H1/4218; D04H1/46; F01N1/24; F01N13/08
Domestic Patent References:
| WO2019004153A1 | 2019-01-03 | |||
| WO2014141418A1 | 2014-09-18 |
Foreign References:
| JPH04203308A | 1992-07-23 | |||
| JP2019191345A | 2019-10-31 |
Attorney, Agent or Firm:
ASHITABA INTERNATIONAL PATENT OFFICE (JP)
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