Laminated nonwoven fabric and air purifier
T Nakamura, T Yamaguchi, H Sumida… - US Patent …, 2019 - Google Patents
(57) ABSTRACT A laminated nonwoven fabric (NF) includes a first NF containing first fibers
and a second NF containing second fibers and laminated on the first NF, and has a cut-off …
and a second NF containing second fibers and laminated on the first NF, and has a cut-off …