Absorbent structure with discrete acquisition cells
View Patent ↗An absorbent structure including a composite absorbent laminate is disclosed, with the structure suitable for use in disposable absorbent products such as for infant or incontinence care. Notably the laminate comprises discrete acquisition cells each comprising particles of preferably cellulosic absorbent material. The absorbent structure further comprises particulate superabsorbent polymer which can either be blended with the particulate discrete acquisition cells in the absorbent laminate, or provided in a separate absorbent layer of the absorbent structure. The discrete acquisition cells desirably generate free volume for rapid capillary absorption in an ultra-thin absorbent structure.
1. An absorbent structure, comprising:
a composite absorbent laminate comprising a carrier substrate, and a matrix of adhesive filaments, and discrete acquisition cells each comprising particulate cellulosic absorbent material comprising at least one of creped tissue and creped paper, said discrete acquisition cells being maintained in a randomized configuration on said substrate by said adhesive filaments, wherein said particulate absorbent material of said discrete acquisition cells exhibits greater dimensional expansion, upon wetting, in one dimension than in another dimension.
2. An absorbent structure in accordance with claim 1 , wherein
said particulate cellulosic material of said discrete acquisition cells exhibits a free swell capacity of at least about 8 grams/gram, and a Centrifuge Retention Capacity of less than about 5 gram/gram, wherein said particulate absorbent material exhibits greater dimensional expansion, upon wetting, in one dimension than in another dimension.
3. An absorbent structure in accordance with claim 1 , wherein
said particulate cellulosic material of said discrete acquisition cells reaches at least 90% of its free swell capacity in less than 60 seconds.
4. An absorbent structure in accordance with claim 1 , wherein
a quantity of said particulate cellulosic material of said discrete acquisition cells, when hydrated, retains approximately 2 times liquid in free swell capacity than an equivalent dry quantity of parent cellulosic material in undivided form.
5. An absorbent structure in accordance with claim 1 , wherein
said absorbent structure comprises superabsorbent polymer particles, said discrete acquisition cells exhibiting capillary suction time that is less than a capillary suction time exhibited by said superabsorbent polymer particles.
6. An absorbent structure in accordance with claim 5 , wherein
said superabsorbent polymer particles are blended in said matrix of said adhesive filaments and said discrete absorbent cells.
7. An absorbent structure in accordance with claim 5 , wherein
said absorbent structure comprises an absorbent layer having said superabsorbent polymer particles, said absorbent layer being positioned in liquid-transferring relationship with said composite absorbent laminate.
8. An absorbent structure in accordance with claim 1 , wherein
said carrier substrate comprises first and second tissue layers between which said matrix of said adhesive filaments and said discrete absorbent cells is positioned.
9. An absorbent structure, comprising:
a composite absorbent laminate comprising : (1) a carrier substrate, said carrier substrate comprising first and second tissue layers, (2) a matrix of adhesive filaments, and (3) discrete acquisition cells each comprising particulate absorbent material comprising at least one of creped tissue and creped paper, said discrete acquisition cells being maintained in a randomized configuration between said first and second tissue layers on said substrate by said adhesive filaments,
said absorbent structure comprising superabsorbent polymer particles, said discrete acquisition cells exhibiting capillary suction time that is less than a capillary suction time exhibited by said superabsorbent polymer particles, wherein said particulate absorbent material of said discrete acquisition cells exhibits greater dimensional expansion, upon wetting, in one dimension than in another dimension.
10. An absorbent structure in accordance with claim 9 , wherein
said superabsorbent polymer particles are blended in said matrix of said adhesive filaments and said discrete absorbent cells.
11. An absorbent structure in accordance with claim 9 , wherein
said absorbent structure comprises an absorbent layer having said superabsorbent polymer particles, said absorbent layer being positioned in liquid-transferring relationship with said composite absorbent laminate.