# US 10,478,355 B2 · Absorbent core

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- Number: US 10,478,355 B2
- Document ID: US10478355B2
- Status: Granted
- Kind: B2
- Application number: 14/893,268
- Filed: 2013-05-24
- Published: 2016-05-05
- Granted: 2019-11-19
- Earliest claimed: 2013-05-24
- Assignees: Grupe P.I. Mabe, S.A. De C.V.
- Applicants: Grupo P.I. Mabe, S.A. de C.V.
- Inventors: Andrés Zamudio Ahumada; Mauricio Vázquez Arana; José Salcedo Agüallo
- Web page: https://patentgrep.com/patent/US10478355B2

## CPC

- A61F 13/532: inhomogeneous in the plane of the pad
- A61F 13/15617: {Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres}
- A61F 13/15707: {Mechanical treatment, e.g. notching, twisting, compressing, shaping}
- A61F 13/531: having a homogeneous composition through the thickness of the pad (A61F13/538, A61F13/539 take precedence)
- A61F 2013/530343: {being natural fibres}
- A61F 2013/53051: {being only in particular parts or specially arranged}
- A61F 2013/5307: {characterized by the quantity or ratio of superabsorbent material}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

The invention relates to an absorbent core intended for use in a disposable absorbent article, said core comprising an upper surface and a lower surface, a front portion and a rear portion, two longitudinal edges and two transverse edges, and being formed of three layers: an upper layer, an intermediate layer and a lower layer. The upper and lower layers contain less than 25% superabsorbent material. The intermediate layer has three zones with different specific weights: one receiving and distribution zone, one or more transition zones and one or more anti-leakage zones.

## Claims

### Claim 1

An absorbent core for use in a disposable absorbent article having a upper surface and a lower surface, a front portion, a rear portion and a crotch portion, two longitudinal edges and two transverse edges, wherein the absorbent core is formed of three layers: an upper layer, an intermediate layer and a lower layer, such that:
the upper and lower layers are comprised by a homogeneous mixture of fibers of absorbent material and particles of superabsorbent material and the particles of superabsorbent material are present in the upper and lower layers in a concentration lower than 25% by weight, wherein the upper and lower layers are not comprised 100% by fibers of absorbent material,
the intermediate layer is comprised by fibers of absorbent material homogeneously mixed with particles of superabsorbent material and has three zones with different specific weights: an acquisition-distribution zone; one or more transition zones; and one or more anti-leakage zones, in which the specific weight in g/m2 of absorbent material plus superabsorbent material of the acquisition-distribution zone of the intermediate layer is 75% to 100% greater than the specific weight in g/m2 of absorbent material plus superabsorbent material of the one or more anti-leakage zones, the specific weight in g/m2 of absorbent material plus superabsorbent material of the acquisition-distribution zone of the intermediate layer is 30 to 50% greater than an average specific weight of absorbent material plus superabsorbent material of the one or more transition zones, and the specific weight expressed in g/m2 of superabsorbent material plus absorbent material of the one or more transition zones of the intermediate layer gradually decreases towards the transverse edges of the core.

### Claim 2 (depends on 1)

The absorbent core for use in a disposable absorbent article as described in claim 1, wherein the fibers of absorbent material are cellulose fibers.

### Claim 3 (depends on 1)

The absorbent core for use in a disposable absorbent article as described in claim 1, wherein the superabsorbent material is sodium or potassium polyacrylate particles.

### Claim 4 (depends on 1)

A disposable diaper comprising the absorbent core according to claim 1.

### Claim 5 (depends on 1)

A training pant comprising the absorbent core according to claim 1.

### Claim 6 (depends on 1)

A sanitary towel comprising the absorbent core according to claim 1.

### Claim 7 (depends on 1)

An absorbent insert comprising the absorbent core according to claim 1.

### Claim 8 (depends on 1)

An absorbent care for use in a disposable absorbent article as described in claim 1, wherein the acquisition-distribution zone has a density A, the one or more anti-leakage zones have a density B, and the one or more transition zones have a density which varies along the same between A and B, being the density A greater than the density B, and the density is gradually reduced from A to B in the one or more transition zones.