# US 12,419,794 B2 · Disposable absorbent hygiene product comprising absorbent assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,419,794 B2 - Document ID: US12419794B2 - Status: Granted - Kind: B2 - Application number: 17/040,776 - Filed: 2018-03-26 - Published: 2021-01-07 - Granted: 2025-09-23 - Earliest claimed: 2018-03-26 - Assignees: Essity Hygiene and Health Aktiebolag - Applicants: Essity Hygiene and Health Aktiebolag - Inventors: Edward Guidotti; Rikard Vilhelm Meyer Noren - Web page: https://patentgrep.com/patent/US12419794B2 ## CPC - A61F 13/532: inhomogeneous in the plane of the pad - A61F 13/535: inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes ({A61F13/5323,} A61F13/537 take precedence) - A61F 13/49007: {Form-fitting, self-adjusting disposable diapers} - A61F 2013/530051: {being made in cross-linked cellulosic fibres} - A61F 2013/530518: {the maximum being at the crotch} - 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 A disposable absorbent hygiene product is provided, including a main part having a body facing surface intended to face the body of a user and a garment facing surface intended to face away from the body of a user. The main part includes a liquid permeable topsheet at the body facing surface, a liquid impermeable backsheet at the garment facing surface, and an absorbent assembly arranged between the topsheet and the backsheet. In front and back regions of the absorbent assembly, the absorbent assembly includes cellulosic fibers mixed with super absorbent polymers, with a central region of the absorbent assembly providing from 70% to 100% of the total retention capacity of the absorbent assembly. ## Claims ### Claim 1 A disposable absorbent hygiene product comprising: a main part having a body facing surface intended to face a body of a user and a garment facing surface intended to face away from the body of the user, the main part comprising a liquid permeable topsheet at the body facing surface, a liquid impermeable backsheet at the garment facing surface, and an absorbent assembly arranged between said topsheet and said backsheet, said main part having a front end and a back end, and defining a longitudinal direction from said front end towards said back end and defining a transversal direction perpendicular to the longitudinal direction, wherein the absorbent assembly has a longitudinal length of from 500 to 1000 mm and a transversal width of from 200 to 450 mm, and is divided by two, imaginary, transversally extending lines into a front region towards said front end, having a longitudinal length of from 10 to 40% of the longitudinal length of the absorbent assembly; a back region towards said back end, having a longitudinal length of from 10 to 40% of the longitudinal length of the absorbent assembly; and a central region between said front region and said back region, the front, back and central regions being non-overlapping, wherein in the front and back regions, the absorbent assembly comprises cellulosic fibers mixed with super absorbent polymers, with a super absorbent polymer concentration of from 0 to 30 weight %, based on a total weight of cellulosic fibers and super absorbent polymer, and a cellulosic fiber basis weight of from 50 to 200 g/m2; wherein said absorbent assembly comprises: a first absorbent core, an entirety of which comprises cellulosic fibers mixed with super absorbent polymers, with a super absorbent polymer concentration of from 0 to 30 weight %, and having a cellulosic fiber basis weight of from 50 to 200 g/m2, said first absorbent core extending over an entirety of the longitudinal length of the absorbent assembly, and a second absorbent core smaller than the first absorbent core in the longitudinal direction and positioned in said central region and in stacked relationship with said first absorbent core, the first absorbent core being closer to the body facing surface than the second absorbent core; and wherein said central region provides from 70% to 100% of a total retention capacity of the absorbent assembly. ### Claim 2 (depends on 1) The product according to claim 1, wherein in said front and back regions, said absorbent assembly comprises comminuted cellulosic fibers. ### Claim 3 (depends on 1) The product according to claim 1, wherein a mixture of cellulosic fibers and superabsorbent particles in said front and back regions has a basis weight coefficient of variation of at most 20%. ### Claim 4 (depends on 1) The product according to claim 1, wherein in said front and back regions, the super absorbent polymer concentration is at least 5 weight %. ### Claim 5 (depends on 4) The product according to claim 4, wherein a mixture of cellulosic fibers and super absorbent polymer has at least one of a retention capacity, calculated as g/g absorbency, with a coefficient of variation of at most 20%, and a retention capacity, calculated as g/10 cm2, with a coefficient of variation of at most 30%. ### Claim 6 (depends on 1) The product according to claim 1, wherein said central region provides from 75 to 95% of the total retention capacity of the absorbent assembly. ### Claim 7 (depends on 1) The product according to claim 1, wherein a planar surface area of the central region is at most 75% of a planar surface area of the absorbent assembly. ### Claim 8 (depends on 7) The product according to claim 7, wherein a ratio of the retention capacity to the planar surface area of the central region is at least 2 times a ratio of the retention capacity to the planar surface area of the front region and the back region. ### Claim 9 (depends on 1) The product according to claim 1, wherein said second absorbent core comprises a mixture of cellulosic fibers and super absorbent polymer, with a super absorbent polymer concentration of from 20 to 70 weight % and having a cellulosic fiber basis weight of from 250 to 500 g/m2. ### Claim 10 (depends on 1) The product according to claim 1, wherein said first absorbent core is in direct contact with said second core. ### Claim 11 (depends on 1) The product according to claim 1, wherein a longitudinal extension of said central region is defined by a longitudinal extension of said second absorbent core. ### Claim 12 (depends on 1) The product according to claim 1, wherein the longitudinal length of said front region is 70 to 130% of the longitudinal length of said rear region. ### Claim 13 (depends on 1) The product according to claim 1, having a total absorption capacity of at least 1000 ml. ### Claim 14 (depends on 1) The product according to claim 1, wherein said second absorbent core is positioned between said first absorbent core and at least one of: said backsheet or said topsheet. ### Claim 15 (depends on 1) The product according to claim 1, further comprising: an acquisition layer material sandwiched between said topsheet and said absorbent assembly. ### Claim 16 (depends on 15) The product according to claim 15, wherein said acquisition layer material is wholly positioned within an area of said central region. ### Claim 17 (depends on 1) The product according to claim 1, wherein the product comprises one of an open type diaper, a pant type diaper, a belt type diaper, an incontinence pad and an absorbent insert. ### Claim 18 (depends on 2) The product according to claim 2, wherein a mixture of cellulosic fibers and superabsorbent particles in said front and back regions has a basis weight coefficient of variation of at most 20%, wherein in said front and back regions, the super absorbent polymer concentration is at least 5 weight %, wherein a mixture of cellulosic fibers and super absorbent polymer has at least one of a retention capacity, calculated as g/g absorbency, with a coefficient of variation of at most 20%, and a retention capacity, calculated as g/10 cm2, with a coefficient of variation of at most 30%, wherein said central region provides from 75 to 95% of the total retention capacity of the absorbent assembly, wherein a planar surface area of the central region is at most 75% of a planar surface area of the absorbent assembly, wherein a ratio of the retention capacity to the planar surface area of the central region is at least 2 times a ratio of the retention capacity to the planar surface area of the front region and back region, wherein said absorbent assembly comprises a first absorbent core comprising cellulosic fibers mixed with super absorbent polymers, with a super absorbent polymer concentration of from 0 to 30 weight %, and having a cellulosic fiber basis weight of from 50 to 200 g/m2, said first core extending over an entirety of the longitudinal length of the absorbent assembly, and a second absorbent core positioned in said central region and in stacked relationship with said first absorbent core, wherein said second absorbent core comprises a mixture of cellulosic fibers and super absorbent polymer, with a super absorbent polymer concentration of from 20 to 70 weight % and having a cellulosic fiber basis weight of from 250 to 500 g/m2, wherein said first absorbent core is in direct contact with said second core, wherein a longitudinal extension of said central region is defined by a longitudinal extension of said second absorbent core, wherein the longitudinal length of said front region is 70 to 130% of the longitudinal length of said rear region, wherein the product has a total absorption capacity of at least 1000 ml, wherein said second absorbent core is positioned between said first absorbent core and at least one of: said backsheet and said topsheet, wherein the product further comprises an acquisition layer material sandwiched between said topsheet and said absorbent assembly, wherein said acquisition layer material is wholly positioned within an area of said central region, and wherein the product comprises one of an open type diaper, a pant type diaper, a belt type diaper, an incontinence pad and an absorbent insert.