Hydroentangled nonwoven fabric, method of making it and absorbent article containing the fabric
A nonwoven fabric comprising at least 50% by weight microfibers having a fineness of 1.0 dtex or less and a length of at least 30 mm and having been combined by hydroentangling. The fabric is apertured by said hydroentangling, and has been carded before hydroentangling. The fabric may be used as a topsheet material on an absorbent article.
1. A nonwoven fabric comprising
microfibers having a fineness of 1.0 dtex or less and having been combined by hydroentangling, said fabric being apertured by said hydroentangling, wherein the fabric comprises at least 50% by weight of said microfibers, which have a length of at least 30 mm and have been carded before hydroentangling;
a plurality of first apertures of a first size disposed in a first zone; and
a plurality of second apertures of a second size disposed in a second zone surrounding the first zone,
wherein the fabric contains an amount of crimped microfibers.
2. The fabric of claim 1 , wherein the nonwoven fabric comprises at least 70% of said microfibers.
3. The fabric of claim 1 , wherein the nonwoven fabric comprises 100% manmade fibers and is free from natural fibers.
4. The fabric of claim 3 , wherein the nonwoven fabric comprises 100% of said microfibers.
5. The fabric of claim 1 , wherein the microfibers have a length of at least 32 mm.
6. The fabric of claim 1 , wherein the plurality of first apertures of the first size in the first zone and the plurality of second apertures of the second size in the second zone surrounding the first zone are in a repeated pattern in at least one of a machine direction, a cross direction of the fabric, and both in the machine and the cross direction.
7. The fabric of claim 1 , wherein a size of each aperture may vary from 0.1 to 8 mm 2 .
8. The fabric claim 1 , wherein an open area of the apertured fabric is between 10 and 50%.
9. The fabric of claim 1 , wherein the fabric has a basis weight of between 16 and 60 g/m 2 .
10. The fabric of claim 1 , wherein all microfibers are hydrophobic microfibers.
11. The fabric of claim 10 , wherein the fabric contains a wetting agent.
12. The fabric of claim 1 , wherein the fabric comprises up to 50% by weight man made fibers having a fineness of more than 1.0 dtex and up to 5.0 dtex.
13. The fabric of claim 12 , wherein said fibers having a fineness of more than 1.0 dtex are predominantly located on one side of the fabric, while an opposite side of the fabric predominantly comprises microfibers.
14. A method of making a nonwoven fabric, comprising the steps of:
forming a carded fibrous web comprising at least 50% by weight microfibers having a fineness of 1.0 dtex or less and a length of at least 30 mm;
hydroentangling the carded fibrous web using an aperturing support member to produce an apertured hydroentangled nonwoven fabric;
forming a plurality of first apertures of a first size disposed in a first zone; and
forming a plurality of second apertures of a second size disposed in a second zone surrounding the first zone,
wherein the fabric contains an amount of crimped microfibers.
15. The method as claimed in claim 14 , wherein the aperturing support member forms the plurality of first apertures of the first size disposed in the first zone and the plurality of second apertures of the second size disposed in the second zone surrounding the first zone in a repeated pattern in at least one of a machine direction, a cross direction of the web, and both in the machine and the cross direction.
16. The method as claimed in claim 14 , wherein the carded fibrous web comprises at least 50% by weight microfibers and no more than 50% by weight other fibers having a fineness of more then 1.0 dtex and a length of at least 30 mm, wherein said microfibers and other fibers are applied in a layered configuration, and wherein the hydroentangled nonwoven fabric produced by hydroentangling the carded fibrous web comprises predominantly microfibers on one side and predominantly other fibers on the opposite side.
17. The method as claimed in claim 14 , comprising hydroentangling the carded fibrous web with a hydroentangling pressure of between 70 and 120 bars.
18. Absorbent article comprising a topsheet arranged on a wearer facing side of an absorbent structure wherein said topsheet comprises a carded, hydroentangled and apertured nonwoven fabric as claimed in claim 1 ,
wherein said topsheet comprises apertures of at least two different sizes arranged in discrete zones of the topsheet, and
wherein apertures of a relatively larger size are arranged in a central portion of the article intended to form a wetting area, while apertures of a relatively smaller size are arranged in an area surrounding the wetting area.
19. Absorbent article as claimed in claim 18 , wherein said nonwoven fabric forming the topsheet comprises no more than 50% by weight other fibers having a fineness of more then 1.0 dtex and a length of at least 30 mm, said other fibers being predominantly located on a side of the topsheet facing the absorbent structure, while a side of the topsheet facing a wearer predominantly comprises microfibers.
20. The fabric of claim 2 , wherein the nonwoven fabric comprises at least 90% of said microfibers.
21. The fabric of claim 5 , wherein the microfibers have a length of at least 35 mm.
22. The fabric of claim 7 , wherein the size of each aperture varies from between 0.8 and 4 mm 2 .
23. The fabric of claim 8 , wherein the open area of the apertured fabric is between 20 and 40%.
24. The fabric of claim 9 , wherein the basis weight is between 20 and 40 g/m 2 .
25. The fabric of claim 12 , wherein the fineness is between 2.0 and 4.0 dtex.
26. The method as claimed in claim 14 , wherein the length of the microfibers is at least 32 mm.
27. The method as claimed in claim 26 , wherein the length of the microfibers is at least 35 mm.