US 7,498,281 B2
	Nonwoven fabric and tea bag
Hirohumi Iwasaki, Ashiya (Japan); Hirohiko Nagao, Kobe (Japan); Naoko Yamaguchi, Osaka (Japan); and Mitsunori Saito, Takatsuki (Japan)
Assigned to Asahi Kasei Fibers Corporation, Osaka-Shi (Japan); and Ohki Co., Ltd., Osaka-Shi (Japan)
Appl. No. 10/519,788 PCT Filed Jun. 24, 2003, PCT No. PCT/JP03/08005 § 371(c)(1), (2), (4) Date Dec. 29, 2004, PCT Pub. No. WO2004/003277, PCT Pub. Date Jan. 08, 2004.
Claims priority of application No. 2002-192497 (JP), filed on Jul. 01, 2002; and application No. 2002-192507 (JP), filed on Jul. 01, 2002.
Prior Publication US 2005/0255768 A1, Nov. 17, 2005
Int. Cl. B32B 5/26 (2006.01); B32B 27/32 (2006.01); D04H 3/16 (2006.01); A61F 13/15 (2006.01)

U.S. Cl. 442—382  [442/381; 442/392; 442/401; 428/219; 428/220]

10 Claims

1. A nonwoven fabric comprising a thermoplastic synthetic fiber nonwoven fabric having a fabric weight of 7 to 50 g/m2, an average fiber diameter of 7 to 40 μm, a partial heat contact bonding ratio of 5 to 30% and a content of a delustering agent of 0.5% by weight or less, wherein the nonwoven fabric is a laminate of a thermoplastic synthetic fiber spun-bonded nonwoven fabric having an average fiber diameter of 7 to 15 μm and a thermoplastic synthetic fiber spun-bonded nonwoven fabric having an average fiber diameter of 15 to 40 μm, wherein the nonwoven fabric has a variation ratio of a fabric weight, 10 cm×10 cm, of 10% or less and wherein the nonwoven fabric has a maximum opening diameter of 200 to 2,000 μm, and shows a transparency of 50% or more, a powder leakage ratio of 10% by weight or less and a hydrophilicity of less than 10 sec.