Lower surface friction absorbent articles and related methods therefor
An absorbent article includes a fluid pervious top sheet, a fluid impervious bottom sheet, and an absorbent core positioned therebetween. The top sheet comprises a plurality of bicomponent fibers having target friction characteristics.
1. An absorbent article comprising:
a fluid pervious top sheet having bicomponent fibers, the top sheet comprising the top most layer of the absorbent article such that the bicomponent fibers are positioned to engage a wearer's skin when the absorbent article is worn, the top sheet having an average static coefficient of friction greater than or equal to about 0.8 and an average kinetic coefficient of friction less than or equal to about 0.7, the average static coefficient of friction and the average dynamic coefficient of friction being defined by the frictional engagement between the bicomponent fibers and the wearer's skin when the absorbent article is applied to the wearer's skin;
a fluid impervious back sheet; and
an absorbent core positioned between the top sheet and the back sheet.
2. The absorbent article of claim 1 , wherein the absorbent core comprises at least one superabsorbent section comprising superabsorbent polymer particles.
3. The absorbent article of claim 2 , wherein the at least one superabsorbent section comprises a first superabsorbent section and a second superabsorbent section, wherein the first superabsorbent section defines a first zone comprising a first amount of superabsorbent polymer particles and the second superabsorbent section defines a second zone comprising a second amount of superabsorbent polymer particles, the first amount of superabsorbent polymer particles being greater than the second amount of superabsorbent polymer particles.
4. The absorbent article of claim 3 , wherein the first zone comprises greater than or equal to about 70 wt % of superabsorbent polymer particles and less than or equal to about 30 wt % fluff pulp.
5. The absorbent article of claim 1 , wherein the absorbent core comprises a matrix of fluff pulp.
6. The absorbent article of claim 1 , wherein the top sheet consists essentially of bicomponent fibers having about a polyethylene sheath around a polypropylene core.
7. The absorbent article of claim 1 , wherein the top sheet has an outer layer of spun bond bicomponent fibers, a second layer of melt blown bicomponent fibers, and a third layer of spun bond bicomponent fibers.
8. The absorbent article of claim 1 , wherein the average static coefficient of friction of the top sheet is in a range of from about 0.8 to 1.
9. The absorbent article claim 8 , wherein the average kinetic coefficient of friction of the top sheet is in a range of from about 0.5 to 0.7.
10. A method of fabricating an absorbent article, comprising:
providing a fluid pervious top sheet having bicomponent fibers in an amount sufficient to provide the top sheet with an average static coefficient of friction greater than or equal to about 0.8 and an average dynamic coefficient of friction less than or equal to about 0.7, the top sheet comprising the top most layer of the absorbent article such that the bicomponent fibers are positioned to engage a wearer's skin when the absorbent article is worn, the average static coefficient of friction and the average dynamic coefficient of friction being defined by the frictional engagement between the bicomponent fibers and the wearer's skin when the absorbent article is applied to the wearer's skin;
providing a fluid impervious back sheet; and
positioning an absorbent core between the top sheet and the back sheet.
11. The method of claim 10 , wherein providing the top sheet comprises providing a first layer of spun bond bicomponent fibers, providing a second layer of melt blown bicomponent fibers, and providing a third layer of spun bond bicomponent fibers.
12. The method of claim 11 , wherein providing the first layer comprises selecting the amount of the bicomponent fibers sufficient to achieve an average static coefficient of friction in a range of from about 0.8 to 1 and an average kinetic coefficient of friction in a range of from about 0.5 to 0.7.
13. The method of claim 10 , wherein providing the top sheet comprises providing a first layer of spun bond bicomponent fibers, providing a second layer of spun bond bicomponent fibers, and providing a third layer of spun bond bicomponent fibers, wherein the average static coefficient of friction of the first layer is in a range of from about 0.8 to 1 and the average kinetic coefficient of friction of the first layer is in a range of from about 0.5 to 0.7.
14. The method of claim 10 , wherein the top sheet consists essentially of bicomponent fibers.
15. The article of claim 1 , wherein the top sheet is in contact with the absorbent core.
16. The article of claim 1 , wherein the top sheet extends beyond an edge of the absorbent core.
17. The article of claim 1 , wherein the absorbent core is surrounded by peripheral regions of the top sheet and the back sheet.
18. The absorbent article of claim 2 , further comprising a second superabsorbent section comprising superabsorbent polymer particles, wherein the first superabsorbent section is spaced from the second superabsorbent section defining a channel extending longitudinally along the absorbent article.
19. The absorbent article of claim 1 wherein the bicomponent fibers include a constituent component having a crystallization temperature selected to provide the average static coefficient of friction and the average dynamic coefficient of friction.