Laminated nonwoven fabric

Patent metadata

Field	Value
Publication number	US-11015272-B2
Application number	US-201615557307-A
Country	US
Kind code	B2
Filing date	Mar 10, 2016
Priority date	Mar 12, 2015
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

There is provided a laminated nonwoven fabric having excellent sound absorbing performance in a low frequency range, the laminated nonwoven fabric having a skin layer and a base material layer, the skin layer having a nonwoven fabric A, the nonwoven fabric A having a density of 100 to 500 kg/m3, a thickness of 0.5 to 2.5 mm, and an air permeability of 4 to 40 cm3/cm2/s; and the base material layer having a nonwoven fabric B, the nonwoven fabric B having a basis weight of 200 to 500 g/m2 and a thickness of 5 to 40 mm.

First claim

The invention claimed is:

1. A laminated nonwoven fabric having a skin layer and a base material layer,
the skin layer having a nonwoven fabric A, the nonwoven fabric A having a density of 100 to 500 kg/m 3 , a thickness of 0.5 to 2.5 mm, and an air permeability of 4 to 40 cm 3 /cm 2 /s, wherein the nonwoven fabric is constituted by laminating a nanofiber layer and a layer of fibers thicker than nanofibers; and
the base material layer having a nonwoven fabric B, the nonwoven fabric B having a basis weight of 200 to 500 g/m 2 and a thickness of 5 to 40 mm,
wherein the nonwoven fabric A has a pore diameter dispersion degree of 1 to 20 in the range of the fine pore size distribution frequency exceeding 0 to 10 nm or less, and a pore diameter dispersion degree of 15 to 60 in the range of 10 to 20 nm, and
wherein the nonwoven fabric B contains a crimped thermoplastic fiber.

2. The laminated nonwoven fabric according to claim 1 , wherein the nonwoven fabric B has a thickness of 10 to 40 mm.

3. The laminated nonwoven fabric according to claim 1 , wherein the nonwoven fabric A comprises 20 to 40% by mass of a thermoplastic fiber having a single fiber diameter of 1 to 5000 nm, relative to the whole nonwoven fabric A.

4. The laminated nonwoven fabric according to claim 1 , wherein the nonwoven fabric A comprises 20 to 40% by mass of a thermoplastic fiber having a single fiber diameter of 1 to 700 nm, relative to the whole nonwoven fabric A, and
the nonwoven fabric constituted by laminating a layer having a fiber with a single fiber diameter of 1 to 700 nm and another layer having a fiber with a single fiber diameter of more than 5000 nm.

5. The laminated nonwoven fabric according to claim 1 , having a bending resistance of 300 mm or less.

6. The laminated nonwoven fabric according to claim 1 , wherein the nonwoven fabric A has fibers made of polyamide and/or fibers made of polyethylene terephthalate.

7. The laminated nonwoven fabric according to claim 1 , wherein the nonwoven fabric B has a binder fiber and the content of the binder fiber is 5 to 30% by mass relative to the whole nonwoven fabric B.

8. A sound absorbing material comprising the laminated nonwoven fabric defined in claim 1 .

Assignees

• Toray Industries

Inventors

• Kajiyama Hiroshi
• Omori Taira
• Sakai Kenichi

Classifications

• D10B2331/02

  polyamides (D10B2331/08 takes precedence) · CPC title

• D04H1/593

  to layered webs · CPC title

• B32B2605/08

  Cars · CPC title

• B32B2457/00

  Electrical equipment · CPC title

• B32B2419/00

  Buildings or parts thereof · CPC title