To provide a sound absorbing panel which can improve sound absorbency for sound waves in a low frequency region.
A plate 12 having one or more opening parts 12a is laminated on one surface of a fiber sound absorbing layer 13 and a plate-shaped honeycomb structure 14 is laminated on the other surface of the fiber sound absorbing layer 13 to make a sound absorbing panel 11. An area ratio of the opening parts 12a may be approximately 10-80% based on the total area of the plate 12. The plate 12 may have a plurality of opening parts, and an average area of the opening parts may be approximately 5-2,500 cm2. An average thickness of the plate 12 may be 1-15 mm. A ratio of the average thickness of the plate 12 to that of the fiber sound absorbing layer 13 may be 2/1 to 1/10. The plate 12 may be formed of a woody material. The fiber sound absorbing layer 13 may be formed of a plate-shaped nonwoven fiber structure in which fiber is fixed by fusion of wet heat bondable fiber.
KIYOOKA SUMITO
ADACHI ATSUMI
| JPS57116998U | 1982-07-20 | |||
| JP2007291834A | 2007-11-08 | |||
| JP2003295867A | 2003-10-15 | |||
| JPS5811800U | 1983-01-25 | |||
| JPS4987720U | 1974-07-30 | |||
| JPS6183743A | 1986-04-28 | |||
| JP2009121032A | 2009-06-04 | |||
| JP2010163778A | 2010-07-29 | |||
| JP3120534U | 2006-04-06 | |||
| JPS57116998U | 1982-07-20 | |||
| JP2007291834A | 2007-11-08 | |||
| JP2003295867A | 2003-10-15 | |||
| JPS5811800U | 1983-01-25 | |||
| JP2004037582A | 2004-02-05 | |||
| JPH1165572A | 1999-03-09 |
| US20040148891A1 | 2004-08-05 | |||
| US20090045009A1 | 2009-02-19 | |||
| US20040148891A1 | 2004-08-05 | |||
| US20090045009A1 | 2009-02-19 |
Hiroshi Sanaka