Absorbent cores with improved intake performance
AssigneeRayonier Products and Financial Services Company
InventorsKrishnakumar Rangachari, Paul M. Ducker
Life of this patent
Estimating the term…
Abstract
Multilayered absorbent cores are provided that include synthetic fiber to improve the liquid transport properties of the resulting absorbent articles. The synthetic fiber, which may be found in either the innermost and/or intermediate layers of the absorbent core, particularly improve the rewet performance of the absorbent article. The absorbent cores may be incorporated into a number of absorbent articles, including diapers, feminine hygiene products and incontinence pads.
Claims65
An absorbent core comprising:
- an innermost layer positioned towards the wearer;
- at least one intermediate layer contiguous with said innermost layer and positioned away from the wearer, at least one of said intermediate layers comprising a mixture of cellulosic fiber and superabsorbent particles;
- and
- an outermost layer contiguous with said intermediate layer and positioned furtherest from the wearer, said outermost layer comprising cellulosic fibers,
- wherein either said innermost layer or at least one of said intermediate layers includes synthetic fiber in an effective amount and said absorbent core exhibits a second or third insult ratio of greater than 0.90.
An absorbent core comprising:
- an innermost layer positioned towards the wearer, said innermost layer including synthetic fiber in an amount effective to improve the second or third insult ratio of said absorbent core in comparison to a comparable absorbent core without synthetic fiber;
- at least one intermediate layer contiguous with said innermost layer and positioned away from the wearer, at least one of said intermediate layers comprising a mixture of cellulosic fiber and superabsorbent particles;
- and
- an outermost layer contiguous with said intermediate layer and positioned furtherest from the wearer, said outermost layer comprising cellulosic fibers.
An absorbent core comprising:
- an innermost layer comprising cellulosic fiber positioned towards the wearer;
- at least one intermediate layer contiguous with said innermost layer and positioned away from the wearer, at least one of said intermediate layers including synthetic fiber in an amount effective to improve the second or third insult ratio of said absorbent core in comparison to a comparable absorbent core without synthetic fiber;
- and
- an outermost layer comprising cellulosic fiber contiguous with said intermediate layer and positioned furtherest from the wearer.
A method for producing an absorbent core comprising:
- (a) forming an innermost layer by directing a plurality of discrete length fibers onto a collection surface;
- (b) forming at least one intermediate layer by directing a plurality of discrete length fibers onto the innermost layer;
- (c) forming an outermost layer by directing a plurality of discrete length fibers onto the intermediate layer;
- (d) compacting the innermost, intermediate and outermost layers to form a condensed web;
- and
- (e) calendaring the condensed web, thereby forming a unitary structure, wherein at least one of said innermost and intermediate layers includes synthetic fiber in an amount effective to improve the second or third insult ratio of the absorbent core in comparison to a comparable absorbent core without synthetic fiber.
An absorbent article comprising an absorbent core which includes:
- an innermost layer positioned towards the wearer;
- at least one intermediate layer contiguous with said innermost layer and positioned away from the wearer, at least one of said intermediate layers comprising a mixture of cellulosic fiber and superabsorbent particles;
- and
- an outermost layer contiguous with said intermediate layer and positioned furtherest from the wearer, said outermost layer comprising cellulosic fibers,
- wherein either said innermost layer or at least one of said intermediate layers includes synthetic fiber in an effective amount and said absorbent core exhibits a second or third insult ratio of greater than 0.90.
Dependencies are inferred from the claim text.