# US 11,998,434 B2 · Absorbent core cover for super-absorbing absorbent cores of sanitary products > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,434 B2 - Document ID: US11998434B2 - Status: Granted - Kind: B2 - Application number: 17/369,181 - Filed: 2021-07-07 - Published: 2022-01-27 - Granted: 2024-06-04 - Earliest claimed: 2020-07-24 - Assignees: Sandler AG - Applicants: Sandler AG - Inventors: Martin Schuberth; Uwe Bernhuber - Web page: https://patentgrep.com/patent/US11998434B2 ## CPC - A61F 13/532: inhomogeneous in the plane of the pad - A61F 13/539: characterised by the connection of the absorbent layers with each other or with the outer layers - A61F 13/15203: {Properties of the article, e.g. stiffness or absorbency (chemical aspects A61L15/00)} - A61F 13/15731: {Treating webs, e.g. for giving them a fibrelike appearance, e.g. by embossing} - A61F 13/533: having discontinuous areas of compression - A61F 13/536: having discontinuous areas of compression - A61L 15/28: Polysaccharides or their derivatives {(A61L15/225 takes precedence)} - A61F 2013/15487: {Capillary properties, e.g. wicking} - A61F 2013/15552: {Air permeability} - A61F 2013/15959: {by spunbond technique} - A61F 2013/15967: {by meltblown technique} - A61F 2013/530379: {comprising mixtures of fibres} - A61F 2013/530489: {being randomly mixed in with other material} - A61F 2013/53472: {being a non-woven tissue wrapping the core} - A61F 2013/5349: {being a tissue-wrapped core} - 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) - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) ## Abstract The present invention relates to an absorbent core for sanitary products with an absorption matrix which comprises a high proportion of super-absorbing particles, and an absorbent core cover for enveloping the absorption matrix, wherein the absorbent core cover comprises at least one upper side sheet and one bottom side sheet, and the absorbent core cover comprises at least one connection region spaced apart from the edge of the absorbent core in which the upper side sheet and the bottom side sheet are connected to each other. Here, at least the upper side sheet of the absorbent core cover is embodied as a fleece composite with a fixing layer with a low permeability to retain the particles in the absorption matrix, and a transfer layer for acquiring fluid. Moreover, the invention relates to a sanitary product having such an absorbent core, the use of a fleece composite as an absorbent core cover, and a method for manufacturing a fleece composite for the upper side sheet of the absorbent core cover. ## Claims ### Claim 1 An absorbent core for sanitary products, comprising an absorption matrix having a high proportion of super-absorbing particles and an absorbent core cover for enveloping the absorption matrix, wherein the absorbent core cover comprises at least one upper side sheet and at least one bottom side sheet, and the absorbent core cover comprises at least one connection region spaced apart from the edge of the absorbent core in which the upper side sheet and the bottom side sheet are connected to each other, wherein at least the upper side sheet of the absorbent core cover is embodied as a fleece composite with a fixing layer with a low permeability to retain the particles in the absorption matrix, and a transfer layer for acquiring fluid, wherein the fixing layer is embodied as a spunbond fleece, a meltblown fleece, or an SMS fleece with an SMS layer structure, and the transfer layer is embodied as a staple fibre fleece, and wherein the staple fibres of the staple fibre fleece comprise coarse fibres with fibre finenesses within a range of 3.3 to 12.0 dtex and a coarse fibre cellulosic fibre proportion of up to 45%. ### Claim 2 (depends on 1) The absorbent core for sanitary products of claim 1, wherein the staple fibres of the staple fibre fleece further comprise fine fibres with fibre finenesses within a range of 1.0 to 3.3 dtex and a fine fibre cellulosic fibre proportion of 50% to 100%. ### Claim 3 (depends on 2) The absorbent core for sanitary products of claim 2, wherein the fine fibres have a fibre fineness within a range of 1.3 to 2.2 dtex. ### Claim 4 (depends on 2) The absorbent core for sanitary products of claim 2, wherein the coarse fibre cellulosic fibre proportion is between 15% and 20%. ### Claim 5 (depends on 1) The absorbent core for sanitary products of claim 1, wherein the coarse fiber cellulosic fibre proportion is between 15% and 20%. ### Claim 6 (depends on 1) The absorbent core for sanitary products of claim 1, wherein the staple fibre fleece is manufactured by means of a spunlace process. ### Claim 7 (depends on 1) The absorbent core for sanitary products of claim 1, wherein the staple fibre fleece is needled into the fixing fleece. ### Claim 8 (depends on 1) The absorbent core for sanitary products of claim 1, wherein at least the upper side sheet of the absorbent core cover has a thickness of greater than 0.35 mm. ### Claim 9 (depends on 8) The absorbent core for sanitary products of claim 8, wherein the thickness is between 0.5 mm and 1.2 mm. ### Claim 10 (depends on 1) The absorbent core for sanitary products of claim 1, wherein at least the upper side sheet of the absorbent core cover comprises, at a test pressure of 200 Pa, an air permeability of maximally 3,500 l/m2/s. ### Claim 11 (depends on 10) The absorbent core for sanitary products of claim 10, wherein the air permeability is maximally 3,000 l/m2/s. ### Claim 12 (depends on 1) The absorbent core for sanitary products of claim 1, wherein at least the upper side sheet of the absorbent core cover comprises, in a wicking test, a capillary rise of water of at least 10 mm after 300 seconds. ### Claim 13 (depends on 1) The absorbent core for sanitary products of claim 1, wherein a run-off proportion is, at least for the upper side sheet of the absorbent core cover, smaller than 50% in a run-off test based on WSP 80.9. ### Claim 14 (depends on 1) The absorbent core for sanitary products of claim 1, wherein the strike-through time for at least the upper side sheet of the absorbent core cover is less than 3 seconds in a strike-through test. ### Claim 15 (depends on 14) The absorbent core for sanitary products of claim 14, wherein the strike-through time is less than 1.5 seconds. ### Claim 16 (depends on 1) A sanitary product with an optional top sheet, an acquisition-distribution layer (ADL), an absorbent core for sanitary products according to claim 1, and an optional back sheet, wherein the upper side sheet and the bottom side sheet are connected to each other to form a channel opposite the acquisition-distribution layer, when the absorption matrix swells by acquisition of fluid. ### Claim 17 (depends on 1) A method for manufacturing an absorbent core for sanitary products, the method comprising: providing the absorbent core of claim 1, forming the absorbent core cover by affixing the at least one upper side sheet and the at least one bottom side sheet through the at least one connection region; and applying the absorbent core cover to the absorption matrix such that the absorbent core cover envelopes the absorption matrix. ### Claim 18 (depends on 17) The method of claim 17, further comprising needling the transfer layer into the fixing layer.