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POROUS SOUND-ABSORBING BOARD
A perforated sound-absorbing plate includes a perforated plate as a base material in which a large number of through holes are formed. A coating film is provided on an inner wall surface of the through hole, and a through-hole portion whose volume is smaller than a volume of the through hole is formed by the coating film.
POROUS SOUND-ABSORBING BOARD
A perforated sound-absorbing plate includes a perforated plate as a base material in which a large number of through holes are formed. A coating film is provided on an inner wall surface of the through hole, and a through-hole portion whose volume is smaller than a volume of the through hole is formed by the coating film.
POROUS SOUND-ABSORBING BOARD
YAMAGUCHI ZENZO (author) / YAMAGIWA ICHIRO (author)
2019-04-18
Patent
Electronic Resource
English
SOUND-ABSORBING BOARD, INSTALLATION METHOD OF SOUND-ABSORBING BOARD
European Patent Office | 2017
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