Pattern unbonded nonwoven web and process for making same
View Patent ↗The present invention provides a pattern-unbonded material that has at least two distinct regions. One region has different bond pattern than another region. The different bond pattern provides different, specific functionality or characteristics to the material. In an embodiment, the one region provides an optimal mechanical fastener, hook engagement. The different characteristics include, but are not limited to, opacity, tensile strength or stiffness. The different characteristics are provided by a bond pattern specific to the particular region. The outer regions, in an embodiment, are stronger and appear more substantial by being more opaque than or color-shifted relative to an inner region. The outer regions, in an embodiment, are not directly backed or supported by the garment to which the material is attached. Accordingly, it is important for the outer regions to provide adequate strength, stiffness, color, and opacity absent the garment backing the outer regions.
1. A pattern-unbonded nonwoven fabric, comprising:
a nonwoven web having a fibrous structure of individual fibers or filaments;
the nonwoven web having on a surface thereof a pattern of continuous bonded areas defining a first plurality of discrete unbonded areas and a second plurality of discrete unbonded areas;
the first plurality of discrete unbonded areas having a first opacity level; and
the second plurality of discrete unbonded areas having a second opacity level, the second opacity level being higher than the first opacity level.
2. A pattern-unbonded non-woven web, comprising:
a first region including a first pattern of continuous bonded areas defining a first plurality of discrete unbonded areas;
at least one second region including a second pattern of continuous bonded areas defining a second plurality of discrete unbonded areas, the second pattern being different from the first pattern, the first region having a first opacity level and the second region having a second opacity level, the second opacity level being higher than the first opacity level.
3. The fabric of claim 1 , wherein the first plurality of discrete unbonded areas have a first tensile strength, and the second plurality of discrete unbonded areas have a second tensile strength, the second tensile strength being greater than the first tensile strength.
4. The fabric of claim 1 , wherein the first plurality of discrete unbonded areas have a first stiffness, and the second plurality of discrete unbonded areas have a second stiffness different from the first stiffness.
5. The web of claim 2 , wherein the first pattern of continuous bonded areas have a first tensile strength, and the second pattern of continuous bonded areas have a second tensile strength, the second tensile strength being greater than the first tensile strength.
6. The web of claim 2 , wherein the first pattern of continuous bonded areas have a first stiffness, and the second pattern of continuous bonded areas have a second stiffness different from the first stiffness.
7. The fabric of claim 1 , wherein at least a portion of the individual fibers or filaments within the first plurality of discrete unbonded areas extend into and are bonded within the continuous bonded area.
8. The fabric of claim 7 , wherein at least a portion of the individual fibers or filaments within the second plurality of discrete unbonded extend into and are bonded within the continuous bonded areas.
9. The fabric of claim 8 , wherein the continuous bonded areas comprise from about 25 percent to about 50 percent of the nonwoven web.
10. The fabric of claim 1 , wherein the nonwoven web includes melt-spun filaments.
11. The fabric of claim 10 , wherein said nonwoven web includes melt-spun filaments, including multicomponent filaments.
12. The fabric of claim 9 , wherein the nonwoven web includes staple fibers.
13. The fabric of claim 1 , further comprising a film layer attached to a surface of the nonwoven web opposite the surface having the pattern of continuous bonded areas defining the first plurality of discrete unbonded areas, and the second plurality of discrete unbonded areas.
14. The fabric of claim 1 , further comprising a second nonwoven web having a fibrous structure of individual fibers or filaments, the second nonwoven web being laminated to the first nonwoven web.
15. The fabric of claim 3 , wherein the second tensile strength is about twenty-two pounds.
16. The fabric of claim 3 , wherein the first tensile strength is about thirteen pounds.
17. The fabric of claim 3 , wherein the second tensile strength is about nine pounds greater than the first tensile strength.
18. The fabric of claim 4 , wherein the first stiffness is greater than the second stiffness such that the nonwoven web in a region including the second plurality of discrete unbonded areas more easily bends.
19. The fabric of claim 4 , wherein the second stiffness is greater than the first stiffness.
20. The web of claim 2 , wherein the first region is adapted for fastening engagement with a hook-type fastener.
21. The web of claim 2 , wherein the at least one second region is adjacent the first region in a machine cross direction of the web.
22. The web of claim 2 , wherein the at least one second region includes a transition region adjacent the first region, and wherein the transition region includes a third pattern of continuous bonded areas defining a third plurality of discrete unbonded areas, the third pattern being a gradient from the first pattern to the second pattern.
23. The web of claim 5 , wherein the second tensile strength is about twenty-two pounds.
24. The web of claim 5 , wherein the first tensile strength is about thirteen pounds.
25. The web of claim 5 , wherein the second tensile strength is about nine pounds greater than the first tensile strength.
26. The web of claim 6 , wherein the first stiffness is greater then the second stiffness such that the nonwoven web in a region including the second plurality of discrete unbonded areas more easily bends.
27. The web of claim 6 , wherein the second stiffness is greater than the first stiffness.
28. A disposable absorbent article comprising the pattern-unbonded nonwoven fabric of claim 1 .
29. A disposable absorbent article, comprising:
a bodyside liner;
an outer cover,
an absorbent structure disposed between the liner and the outer cover;
a mechanical fastening tab joined to the article, the fastening tab including a male fastening component; and
a female component joined to the outer cover and adapted for releasable engagement with the male component,
the female component comprising the pattern-unbonded nonwoven fabric of claim 1 .