Laminated nonwoven fabric

Patent metadata

Field	Value
Publication number	US-11225048-B2
Application number	US-201816488324-A
Country	US
Kind code	B2
Filing date	Feb 21, 2018
Priority date	Feb 28, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The present invention provides a laminated nonwoven fabric achieving both handling properties during manufacturing and use and adherence to a skin surface at a high level particularly when used for a face mask. The laminated nonwoven fabric includes a nonwoven fabric layer (A) and a nonwoven fabric layer (B). The nonwoven fabric layer (A) is formed from a fiber A having a single fiber diameter of 50 nm or more and 800 nm or less, and the nonwoven fabric layer (B) is formed from a fiber B having a single fiber diameter of 3 μm or more and 30 μm or less. The nonwoven fabric layer (B) includes 15 to 40% by mass of a fiber B1 to all of the fibers constituting the nonwoven fabric layer (B), the fiber having tensile strength of 2.0 cN/dtex or less as measured based on JIS L 1015: 2010 8.7.2. The nonwoven fabric layer (B) Includes a fiber B2 having tensile strength exceeding 2.0 cN/dtex as measured based on JIS L 1015: 2010 8.7.2. The nonwoven fabric layer (A) is disposed as an outermost layer of at least one surface.

First claim

The invention claimed is:

1. A laminated nonwoven fabric comprising a nonwoven fabric layer (A) and a nonwoven fabric layer (B),
wherein
the nonwoven fabric layer (A) is formed from a fiber A having a single fiber diameter of 50 nm or more and 800 nm or less,
the nonwoven fabric layer (B) is formed from a fiber B having a single fiber diameter of 3 μm or more and 30 μm or less,
the nonwoven fabric layer (B) includes 15 to 40% by mass of a fiber B1 based on all of the fibers constituting the nonwoven fabric layer (B), the fiber having tensile strength of 2.0 cN/dtex or less as measured based on JIS L 1015: 2010 8.7.2,
the nonwoven fabric layer (B) includes a fiber B2 having tensile strength exceeding 2.0 cN/dtex as measured based on JIS L 1015: 2010 8.7.2, and
the nonwoven fabric layer (A) is disposed as an outermost layer of at least one surface.

2. The laminated nonwoven fabric according to claim 1 , wherein
the laminated nonwoven fabric has wet stiffness of 0.12 mN or more and 0.18 mN or less as measured based on JIS L 1913: 2010.6.7.3, and
the laminated nonwoven fabric has wet tensile strength of 15 N/25 mm or more and 50 N/25 mm or less as measured based on JIS L 1913: 2010.6.3.2.

3. The laminated nonwoven fabric according to claim 1 , wherein
the laminated nonwoven fabric has a basis weight of 30 g/m 2 or more and 65 g/m 2 or less, and
the laminated nonwoven fabric has a thickness of 0.3 mm or more and 1.3 mm or less.

4. The laminated nonwoven fabric according to claim 3 , wherein a thickness ratio (A/B) of the nonwoven fabric layer (A) to the nonwoven fabric layer (B) is 0.05 or more and 0.67 or less.

5. The laminated nonwoven fabric according to claim 1 , wherein the fiber B1 having tensile strength of 2.0 cN/dtex or less as measured based on JIS L 1015: 2010 8.7.2 has a single fiber diameter of 3 μm or more and 8 μm or less.

6. The laminated nonwoven fabric according to claim 1 , wherein a variation of the single fiber diameter of the fiber A is 1.0 to 20.0%.

7. The laminated nonwoven fabric according to claim 1 , wherein the fiber A has a single fiber diameter of 100 nm or more and 400 nm or less.

8. The laminated nonwoven fabric according to claim 1 , wherein the fiber A is a polyamide fiber.

9. The laminated nonwoven fabric according to claim 1 , wherein
the nonwoven fabric layer (B) includes the fiber B which is a polyester fiber, and
a content of the fiber B which is the polyester fiber to the total mass of the nonwoven fabric layer (B) is 60% by mass or more and 85% by mass or less.

10. The laminated nonwoven fabric according to claim 1 , wherein
the fiber B1 having tensile strength of 2.0 cN/dtex or less as measured based on JIS L 1015: 2010 8.7.2 is a regenerated fiber, a semi-synthetic fiber, or an animal natural fiber, and
the fiber B1 is included in an amount of 9 to 36% by mass based on the entire laminated nonwoven fabric.

11. The laminated nonwoven fabric according to claim 1 , wherein a coefficient of static friction of a surface of the laminated nonwoven fabric which is the nonwoven fabric layer (A) disposed as an outermost layer with respect to a simulated silicon skin surface is 1.5 or more.

12. A face mask comprising the laminated nonwoven fabric according to claim 1 .

Assignees

• Toray Industries

Inventors

• Oyama Kumi
• Nakahara Makoto
• Kajiyama Hiroshi

Classifications

• B32B2262/16

  Structural features of fibres, filaments or yarns e.g. wrapped, coiled, crimped or covered · CPC title

• B32B2262/144

  Non-woven fabric · CPC title

• B32B2262/124

  Non-woven fabric · CPC title

• B32B2262/0284

  Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT] · CPC title

• B32B2250/20

  All layers being fibrous or filamentary · CPC title