Nonwoven fabric, and dust collecting filter, medium of microorganism or biological tissue, and cosmetic article, each having the same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsTaichi Nakamura, Takayoshi Yamaguchi, Hiroto Sumida
Life of this patent
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Abstract
A nonwoven fabric contains a plurality of fibers having average fiber diameter Dave in a range from 10 nm to 3 μm, inclusive. The nonwoven fabric has a plurality of fusion portions among the plurality of fibers. The nonwoven fabric has a first principal surface and a second principal surface on an opposite side to the first principal surface. Average number Nh of the fusion portions observed per 500 μm2 on the first principal surface is six or more.
Claims6
A nonwoven fabric containing a plurality of fibers having an average fiber diameter Dave in a range from 10 nm to 3 μm, inclusive, comprising:
- a plurality of fusion portions among the plurality of fibers;
- and
- a first principal surface, and a second principal surface on an opposite side to the first principal surface,
- wherein an average number Nh of the fusion portions observed per 500 μm2 on the first principal surface is six or more,
- wherein an average number Np of the fusion portions observed per 500 μm2 off a cross-section perpendicular to the first principal surface of the nonwoven fabric satisfies Np>Nh.
A dust collecting filter comprising:
- a porous base layer;
- a fiber layer laminated on the porous base layer;
- and
- a nonwoven fabric laminated on the porous base layer via the fiber layer,
- wherein the nonwoven fabric contains a plurality of fibers having an average fiber diameter Dave in a range from 500 nm to 3 μm, inclusive, and has a plurality of fusion portions among the plurality of fibers, a first principal surface, and a second principal surface on an opposite side to the first principal surface,
- wherein an average number Nh of the fusion portions observed per 500 μm2 on the first principal surface is six or more,
- wherein an average number Np of the fusion portions observed per 500 μm2 of a cross-section perpendicular to the first principal surface of the nonwoven fabric satisfies Np>Nh, and
- the fiber layer includes fibers having an average fiber diameter smaller than the average fiber diameter Dave of the fibers contained in the nonwoven fabric.
A medium for microorganisms or biological tissue, comprising a nonwoven fabric,
- wherein the nonwoven fabric contains a plurality of fibers having an average fiber diameter Dave in a range from 0.8 μm to 3 μm, inclusive, and has a plurality of fusion portions among the plurality of fibers, a first principal surface, and a second principal surface on an opposite side to the first principal surface, and
- an average number Nh of the fusion portions observed per 500 μm2 on the first principal surface is six or more,
- wherein an average number Np of the fusion portions observed per 500 μm2 of a cross-section perpendicular to the first principal surface of the nonwoven fabric satisfies Np>Nh.
A cosmetic article comprising a nonwoven fabric,
- wherein the nonwoven fabric contains a plurality of fibers having an average fiber diameter Dave in a range from 10 nm to 800 nm, inclusive, and has a plurality of fusion portions among the plurality of fibers, a first principal surface, and a second principal surface on an opposite side to the first principal surface, and
- an average number Nh of the fusion portions observed per 500 μm2 on the first principal surface is six or more,
- wherein an average number Np of the fusion portions observed per 500 μm2 of a cros-section perpendicular to the first principal surface of the nonwoven fabric satisfies Np>Nh.
Dependencies are inferred from the claim text.