Unitary absorbent structures comprising an absorbent core and/or an acquisition and dispersion layer for absorbent articles
AssigneeLibeltex
InventorsDany Michiels, Tanika Degrande
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Abstract
The present invention relates to a unitary absorbent structure and method thereof wherein said unitary absorbent structure comprises an absorbent core (5) and/or an acquisition (2) and dispersion (3) layer, said absorbent core (5) and/or an acquisition (2) and dispersion (3) layer comprising at least one non-woven fibrous substrate layer (23) having a void volume suitable to be penetrated by super absorbent particles, characterized in that said super absorbent particles are dispersed in the substrate layer (23) according to a size distribution gradient along the depth direction or z-direction of said absorbent core (5) and/or acquisition (2) and dispersion (3) layers.
Claims16
A unitary absorbent structure comprising
- an absorbent core having a permanent liquid holding capacity and an acquisition and dispersion layer having a temporary liquid holding capacity, said absorbent core comprising at least one non-woven fibrous substrate layer, the non-woven substrate layer having a void volume between 600 and 6000 cm3/m2, penetrated by super absorbent particles (SAP), said non-woven fibrous substrate comprising superabsorbent particles in an amount of up to 1000 g/m2 and said super absorbent particles having a size distribution and being dispersed within the non-woven fibrous substrate layer according to a particle size distribution gradient of the super absorbent particles along a depth direction or z-direction of said absorbent core or acquisition and dispersion layers, wherein at least 90% of the super absorbent particles have a particle size diameter ranging from about 45 μm to about 850 μm, and
- a non-porous core-covering layer having a void volume between 10 and 600 cm3, to prevent the release of the SAP outside of the absorbent structure;
- said absorbent structure comprises less than 4 wt. % fluff and is further coated by a covering layer, and wherein smaller size super absorbent particles are able to penetrate, along the z direction, into the bottom part of the substrate while the larger size super absorbent particles remain on the outer part or on the surface of the substrate.
A unitary absorbent structure comprising
- an absorbent core having a permanent liquid holding capacity and an acquisition and dispersion layer having a temporary liquid holding capacity, said acquisition and dispersion layer comprising at least one non-woven fibrous substrate layer, the non-woven substrate layer having a void volume between 600 and 6000 cm3/m2, penetrated by super absorbent particles (SAP), said non-woven fibrous substrate comprising superabsorbent particles in an amount of up to 1000 g/m2 and said super absorbent particles having a size distribution and being dispersed within the non-woven fibrous substrate layer according to a particle size distribution gradient of the super absorbent particles along a depth direction or z-direction of said absorbent core or acquisition and dispersion layers, wherein at least 90% of the super absorbent particles have a particle size diameter ranging from about 45 μm to about 850 μm, and
- a non-porous core-covering layer having a void volume between 10 and 600 cm3, to prevent the release of the SAP outside of the absorbent structure;
- said absorbent structure comprises less than 4 wt. % fluff and is further coated by a covering layer, and wherein smaller size super absorbent particles are able to penetrate, along the z direction, into the bottom part of the substrate while the larger size super absorbent particles remain on the outer part or on the surface of the substrate.
Dependencies are inferred from the claim text.