The present invention relates to a disposable absorbent pad comprising multiple layers. In particular, the absorbent pad of the present invention maintains skin dryness by absorbing moisture while preventing leakage to the skin or the bed linens, allowing air circulation at the surface of the patien
The present invention relates to a disposable absorbent pad comprising multiple layers. In particular, the absorbent pad of the present invention maintains skin dryness by absorbing moisture while preventing leakage to the skin or the bed linens, allowing air circulation at the surface of the patient's skin to prevent heat buildup, and is strong enough to allow the patient to be repositioned, even when the pad is wet. In a particular embodiment the first layer is comprised of a fluid-permeable, porous material, the second layer is disposed under the first layer and is comprised of at least one super absorbent material, and a base layer disposed under the second layer.
대표청구항▼
1. An absorbent pad comprising: a) a first layer which is fluid permeable and air permeable; b) a second layer disposed under the first layer, comprising at least one super absorbent material; c) a base layer disposed under the second layer, comprising breathable film disposed over an air-permeable
1. An absorbent pad comprising: a) a first layer which is fluid permeable and air permeable; b) a second layer disposed under the first layer, comprising at least one super absorbent material; c) a base layer disposed under the second layer, comprising breathable film disposed over an air-permeable material, wherein the absorbent pad, has a tensile strength at 25% elongation, when measured by the ASTM D 882 method, in the range of about 35 N/25 mm to about 55 N/25 mm in the machine direction and about 20 N/25 mm to about 40 N/25 mm in the cross direction. 2. The absorbent pad of claim 1, wherein the first layer comprises a nonwoven material. 3. The absorbent pad of claim 2, wherein the nonwoven material is selected from the group consisting of a hydrophilic nonwoven material, a staple nonwoven material, a melt blown nonwoven material, a spunmelt nonwoven material, a spunbond nonwoven material, SMS (spunbond meltblown spunbond) materials, spun lace materials, needle-felted materials, a thermal bonded nonwoven, a trough air bonded nonwoven material, a spunlaid nonwoven material, or any combination thereof. 4. The absorbent pad of claim 2, wherein the nonwoven material comprises polypropylene, polyethylene, polyethylene terephthalate, polyamide, viscose rayon, nylon, at least one biodegradable polymeric material or a combination thereof. 5. The absorbent pad of claim 1, wherein the first layer has a weight of about 10 gsm to about 20 gsm. 6. The absorbent pad of claim 1, wherein the first layer has a Moisture Transfer Rate of between about 5 sec/mL to about 200 sec/mL. 7. The absorbent pad of claim 1, wherein the first layer has an air permeability in the range of about 10 seconds/100 mL to about 100 seconds/100 mL. 8. The absorbent pad of claim 1, wherein the second layer comprises formed or unformed material. 9. The absorbent pad of claim 1, wherein the second layer comprises natural or synthetic material. 10. The absorbent pad of claim 8, wherein the second layer comprises a formed material, and the formed material is an air-laid material. 11. The absorbent pad of claim 10, wherein the air-laid material comprises cellulose. 12. The absorbent pad of claim 11, wherein the cellulose is selected from the group consisting of wood fibers, plant fibers, field crop fibers, and fluff pulp. 13. The absorbent pad of claim 1, wherein the superabsorbent of the second layer comprises a polymer or copolymer of sodium polyacrylate. 14. The absorbent pad of claim 13, wherein the second layer further comprises about 90 gsm to about 110 gsm of macerated wood pulp. 15. The absorbent pad of claim 1, wherein the second layer has moisture absorption capacity in the range of about 50 cc/m2 to about 20,000 cc/m2 as measured by the ISO11948-1 test method. 16. The absorbent pad of claim 1, wherein the super absorbent material does not substantially swell or separate from the first and/or base layers when wet. 17. The absorbent pad of claim 1, wherein the base layer comprises: c) a third layer disposed under the second layer, comprising a breathable film; and d) a fourth layer disposed under the third layer, comprising an air-permeable material. 18. The absorbent pad of claim 17, wherein the third layer comprises a polyethylene film. 19. The absorbent pad of claim 17, wherein the polyethylene film is perforated. 20. The absorbent pad of claim 17, wherein the third layer has a weight in the range of about 20 gsm to about 45 gsm. 21. The absorbent pad of claim 17, wherein the breathable film of the base layer is hydrophobic. 22. The absorbent pad of claim 17, wherein the third layer has a moisture vapor transmission rate in the range of about 1,000 g/m2/day to about 10,000 g/m2/day. 23. The absorbent pad of claim 17, wherein the fourth layer comprises a nonwoven material. 24. The absorbent pad of claim 23, wherein the nonwoven material is selected from the group consisting of a hydrophobic nonwoven material, a staple nonwoven material, a melt blown nonwoven material, a spunmelt nonwoven material, a spunbond, nonwoven material, SMS (spunbond meltblown spunbond) materials, spun lace materials, needle-felted materials, a thermal bonded nonwoven, a trough air bonded nonwoven material, a spunlaid nonwoven material, or a combination thereof. 25. The absorbent pad of claim 23, wherein the nonwoven material comprises a polymer selected from the group consisting of polypropylene, polyethylene, polyethylene terephthalate, polyamide, viscose rayon, nylon, at least one biodegradable polymeric material and combinations thereof. 26. The absorbent pad of claim 17, wherein the fourth layer has a weight in the range of about 30 to about 80 gsm. 27. The absorbent pad of claim 17, wherein a) the first layer is a spunbond, nonwoven sheet, b) the second layer comprises a thermobonded absorbent airlaid core comprising cellulose fibers and super absorbent polymers c) the third layer is a perforated polyethylene film and d) the fourth layer is a nonwoven sheet with a weight of about 15 gsm to about 90 gsm. 28. The absorbent pad of claim 1, wherein the pad has a maximum lift weight of up to about 400 lbs. 29. The absorbent pad of claim 1, wherein the pad has a maximum lift weight of up to about 325 lbs. 30. The absorbent pad of claim 1, wherein the breathable film of the base layer is hydrophobic. 31. The absorbent pad of claim 1, wherein the tensile strength at break, when measured by the ASTM D 882 method, is about 70±16 N/25 mm in the machine direction and about 45±10 N/25 mm in the cross direction. 32. The absorbent pad of claim 1, wherein the elongation at break, when tested by the ASTM D 882 method, is about 75±40% in the machine direction and about 75±30% in the cross direction. 33. The absorbent pad of claim 1, wherein the tensile strength at 25% elongation, when measured by the ASTM D 882 method, is about 47±8 N/25 mm in the machine direction and about 28±8 N/25 mm in the cross direction. 34. The absorbent pad of claim 1, wherein the tensile strength at 25% elongation, when measured by the ASTM D 882 method, is in the range of about 40 N/25 mm to about 50 N/25 mm in the machine direction and about 25 N/25 mm to about 35 N/25 mm in the cross direction. 35. The absorbent pad of claim 1, wherein the tensile strength of the base layer at break, when measured by the ASTM D 882 method, is in the range of about 45 to about 100 N/25 mm in the machine direction and about 30 to about 60 N/25 mm in the cross direction.
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