EP2285333A1 - Couche ou culotte à meilleur ajustement avec matériau polymère particulaire absorbant et entrejambe préformé - Google Patents

Couche ou culotte à meilleur ajustement avec matériau polymère particulaire absorbant et entrejambe préformé

Info

Publication number
EP2285333A1
EP2285333A1 EP09763309A EP09763309A EP2285333A1 EP 2285333 A1 EP2285333 A1 EP 2285333A1 EP 09763309 A EP09763309 A EP 09763309A EP 09763309 A EP09763309 A EP 09763309A EP 2285333 A1 EP2285333 A1 EP 2285333A1
Authority
EP
European Patent Office
Prior art keywords
absorbent
article
diaper
absorbent core
absorbent article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09763309A
Other languages
German (de)
English (en)
Inventor
Gregory Ashton
Masaharu Nishikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP2285333A1 publication Critical patent/EP2285333A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49001—Absorbent articles specially adapted to be worn around the waist, e.g. diapers having preferential bending zones, e.g. fold lines or grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15804—Plant, e.g. involving several steps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/5323—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets

Definitions

  • the invention generally relates to an absorbent article, and more particularly to a disposable absorbent garment with absorbent particulate polymer material and preformed crotch.
  • Absorbent articles such as disposable diapers, training pants, and adult incontinence undergarments, absorb and contain body exudates. They also are intended to prevent body exudates from soiling, wetting, or otherwise contaminating clothing or other articles, such as bedding, that come in contact with the wearer.
  • a disposable absorbent article such as a disposable diaper, may be worn for several hours in a dry state or in a urine loaded state. Accordingly, efforts have been made toward improving the fit and comfort of the absorbent article to the wearer, both when the article is dry and when the article is fully or partially loaded with liquid exudate, while maintaining or enhancing the absorbing and containing functions of the article.
  • Some absorbent articles like diapers, contain an absorbent polymer material (also known as super absorbent polymer), such as an absorbent particulate polymer material.
  • Absorbent particulate polymer material absorbs liquid and swells and may be more effective when disposed in an absorbent article in a certain pattern or arrangement intended for optimal absorbency, fit, and/or comfort.
  • absorbent particulate polymer material it may be desirable for absorbent particulate polymer material to remain in its intended location in an absorbent article and absorbent particulate polymer material, therefore, is desirably immobilized in the absorbent article such that the absorbent particulate polymer material remains immobilized when the absorbent article is dry and when it is wet.
  • absorbent articles such as diapers
  • absorbent articles may be thin and flexible, for ease and comfort in use and for more convenient and neat packaging and storage.
  • Absorbent articles which may often be used in large quantities, may also desirably be inexpensive.
  • Some technologies of immobilizing absorbent particulate polymer material in an absorbent article add bulk to the absorbent article and thereby increase thickness, reduce flexibility, and/or increase cost of the absorbent article.
  • Other technologies for immobilizing absorbent particulate polymer material in an absorbent article may not be as effective in maintaining immobilization when the absorbent article is in a wet state as when in a dry state.
  • Embodiments of the invention can address one or more technical problems described above and can provide a disposable absorbent garment with absorbent particulate polymer material and preformed crotch.
  • a disposable absorbent article is provided.
  • the article can include an absorbent core with a chassis that can include a topsheet and a backsheet, with the absorbent core located between the topsheet and the backsheet.
  • the chassis may include an absorbent core which includes an absorbent particulate polymer material, the absorbent core being located between the topsheet and the backsheet, and wherein the absorbent core includes at least one strip extending through a portion of a crotch region of the article.
  • the article can also include at least one longitudinally oriented crease passing through a portion of the crotch region, wherein a concave shape is formed within the article.
  • Fig. 1 is a plan view of a diaper in accordance with an embodiment of the invention.
  • Fig. 2 is a cross sectional view of the diaper shown in Fig. 1 taken along the sectional line 2-2 of Fig. 1.
  • Fig. 3 is an overhead view of an absorbent core layer in accordance with an embodiment of the invention.
  • Fig. 4 is a cross sectional view of an absorbent core layer shown in Fig. 3 taken along the sectional line 4-4 of Fig. 3.
  • Fig. 5 is an overhead view of another absorbent core layer in accordance with an embodiment of the invention.
  • Fig. 6 is a schematic illustration of a process for making an absorbent core in accordance with an embodiment of the invention.
  • Fig. 7 is a partial sectional view of an apparatus for making an absorbent core in accordance with an embodiment of the invention.
  • Fig. 8 is a perspective view of the printing roll illustrated in Fig. 7.
  • Fig. 9 is a partial sectional view of the printing roll illustrated in Fig. 8 showing an absorbent particulate polymer material reservoir.
  • Fig. 10 is a perspective view of the supporting roll illustrated in Fig. 8.
  • Fig. 11 is a schematic illustration of a process for making a diaper with an absorbent core in accordance with an embodiment of the invention
  • embodiments of the invention may encompass an absorbent article, such as a diaper, having an absorbent core and a preformed crotch.
  • an absorbent core and preformed crotch advantageously may provide the disposable absorbent article with improved compressibility, flexibility, and conformity to a wearer's body for greater comfort without increasing the likelihood of leakage from the disposable absorbent article.
  • Section A describes terms for assisting the reader in understanding features of the invention, but not introducing limitations in the terms inconsistent with the context with which they are used in the specification.
  • Section B is a detailed description for absorbent articles made in accordance with embodiments of this invention.
  • Section C describes methods of manufacturing absorbent cores and absorbent articles in accordance with embodiments of this invention.
  • Absorbent article refers to devices that absorb and contain body exudates, and, more specifically, refers to devices that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body.
  • Absorbent articles may include diapers, training pants, adult incontinence undergarments, feminine hygiene products, breast pads, care mats, bibs, wound dressing products, and the like.
  • body fluids or “body exudates” includes, but is not limited to, urine, blood, vaginal discharges, breast milk, sweat and fecal matter.
  • “Absorbent core” means a structure typically disposed between a topsheet and backsheet of an absorbent article for absorbing and containing liquid received by the absorbent article and may comprise one or more substrates, absorbent polymer material disposed on the one or more substrates, and a thermoplastic composition on the absorbent particulate polymer material and at least a portion of the one or more substrates for immobilizing the absorbent particulate polymer material on the one or more substrates.
  • the absorbent core may also include a cover layer.
  • the one or more substrates and the cover layer may comprise a nonwoven.
  • the absorbent core is substantially cellulose free.
  • the absorbent core does not include an acquisition system, a topsheet, or a backsheet of the absorbent article.
  • the absorbent core would consist essentially of the one or more substrates, the absorbent polymer material, the thermoplastic composition, and optionally the cover layer.
  • ABSORENT polymer material “absorbent gelling material,” “AGM,” “superabsorbent,” and “superabsorbent material” are used herein interchangeably and refer to cross linked polymeric materials that can absorb at least 5 times their weight of an aqueous 0.9% saline solution as measured using the Centrifuge Retention Capacity test (Edana 441.2-01).
  • Absorbent particulate polymer material is used herein to refer to an absorbent polymer material which is in particulate form so as to be flowable in the dry state.
  • Airfelt is used herein to refer to comminuted wood pulp, which is a form of cellulosic fiber.
  • Compressed or “compression” is used to describe moving fibers or components of a material relatively closer together.
  • Comprise “Comprise,” “comprising,” and “comprises” are open ended terms, each specifies the presence of what follows, e.g., a component, but does not preclude the presence of other features, e.g., elements, steps, components known in the art, or disclosed herein.
  • Concave is used herein to describe a curved surface which bends, narrows, or otherwise slopes slightly inward.
  • suitable concave shapes can be, but are not limited to, a V-shape, a U- shape, and any other similar shape that bends, narrows, or slopes slightly inward.
  • Consisting essentially of is used herein to limit the scope of subject matter, such as that in a claim, to the specified materials or steps and those that do not materially affect the basic and novel characteristics of the subject matter.
  • Disposable is used in its ordinary sense to mean an article that is disposed or discarded after a limited number of usage events over varying lengths of time, for example, less than about 20 events, less than about 10 events, less than about 5 events, or less than about 2 events.
  • Diaper refers to an absorbent article generally worn by infants and incontinent persons about the lower torso so as to encircle the waist and legs of the wearer and that is specifically adapted to receive and contain urinary and fecal waste. As used herein, term “diaper” also includes “pants” which is defined below.
  • Elastic “Elastic”, “elastically extensible”, and “elasticized” refer herein to the property of a material and/or an element of a diaper or other disposable absorbent article whereby the material and/or the element can be elongated to at least 150% of its original unstretched length without rupture or catastrophic failure upon the application of tensioning force and will substantially return to its original length or near its original length after the tension is released.
  • Fiber and “filament” are used interchangeably.
  • a "nonwoven” is a manufactured sheet, web or batt of directionally or randomly orientated fibers, bonded by friction, and/or cohesion and/or adhesion, excluding paper and products which are woven, knitted, tufted, stitch-bonded incorporating binding yarns or filaments, or felted by wet-milling, whether or not additionally needled.
  • the fibers may be of natural or man-made origin and may be staple or continuous filaments or be formed in situ.
  • Nonwoven fabrics can be formed by many processes such as meltblowing, spunbonding, solvent spinning, electrospinning, and carding. The basis weight of nonwoven fabrics is usually expressed in grams per square meter (gsm).
  • Pant or “training pant”, as used herein, refer to disposable garments having a waist opening and leg openings designed for infant or adult wearers.
  • a pant may be placed in position on the wearer by inserting the wearer's legs into the leg openings and sliding the pant into position about a wearer's lower torso.
  • a pant may be preformed by any suitable technique including, but not limited to, joining together portions of the article using refastenable and/or non-refastenable bonds (e.g., seam, weld, adhesive, cohesive bond, fastener, etc.).
  • a pant may be preformed anywhere along the circumference of the article (e.g., side fastened, front waist fastened).
  • pants are also commonly referred to as “closed diapers,” “prefastened diapers,” “pull-on diapers,” “training pants,” and “diaper- pants”. Suitable pants are disclosed in U.S. Patent No. 5,246,433, issued to Hasse, et al. on September 21, 1993; U.S. Patent No. 5,569,234, issued to Buell et al. on October 29, 1996; U.S. Patent No. 6,120,487, issued to Ashton on September 19, 2000; U.S. Patent No. 6,120,489, issued to Johnson et al. on September 19, 2000; U.S. Patent No.
  • Substantially cellulose free is used herein to describe an article, such as an absorbent core, that contains less than 10% by weight cellulosic fibers, less than 5% cellulosic fibers, less than 1% cellulosic fibers, no cellulosic fibers, or no more than an immaterial amount of cellulosic fibers. An immaterial amount of cellulosic material would not materially affect the thinness, flexibility, or absorbency of an absorbent core.
  • thermoplastic adhesive material as used herein is understood to comprise a polymer composition from which fibers are formed and applied to the superabsorbent material with the intent to immobilize the superabsorbent material in both the dry and wet state.
  • the thermoplastic adhesive material of the present invention forms a fibrous network over the superabsorbent material.
  • Fig. 1 is a plan view of a diaper 10 according to a certain embodiment of the invention.
  • the diaper 10 is shown in its flat out, uncontracted state (i.e., without elastic induced contraction) and portions of the diaper 10 are cut away to more clearly show the underlying structure of the diaper 10.
  • a portion of the diaper 10 that contacts a wearer is facing the viewer in Fig. 1.
  • the diaper 10 generally may comprise a chassis 12 and an absorbent core 14 disposed in the chassis.
  • the absorbent core 14 may include one or more strips 15.
  • the strip 15 may be a discontinuity in a homogeneous member produced by cutting, adhering, shearing, leaving a gap, perforation, compressing, or any other method of creating a discontinuity.
  • the absorbent core 14 may include one or more compressed strips 15.
  • the compressed strip 15 can be provided by way of mechanical or pressurized compression of a selected portion of the absorbent core 14.
  • the absorbent core 14 can include at least one compressed strip 15 generally positioned in a central portion of the core 14.
  • the compressed strip 15 shown is generally aligned parallel with and along the transverse axis 100 of the absorbent core 14.
  • Fig. 4 which is a sectional view taken along sectional line 4-4 in Fig. 3, the compressed strip 15 is a slightly compressed portion of the absorbent core 14 relative to the other, non-compressed material comprising the absorbent core 14.
  • a compressed strip can be offset from the transverse axis 100 and/or may be segmented into multiple parts.
  • the compressed strip 15 shown can be made, for example, by nip rolls.
  • an absorbent core 14 can include more than one compressed strip, for instance, two compressed strips 102 and 104 generally aligned parallel with and along the transverse axis 100 of the absorbent core 14.
  • the chassis 12 of the diaper 10 in Fig. 1 may comprise the main body of the diaper 10.
  • the chassis 12 may comprise an outer covering 16 including a topsheet 18, which may be liquid pervious, and/or a backsheet 20, which may be liquid impervious.
  • the absorbent core 14 may be encased between the topsheet 18 and the backsheet 20.
  • the chassis 12 may also include side panels 22, elasticized leg cuffs 24, and an elastic waist feature 26.
  • the leg cuffs 24 and the elastic waist feature 26 may each typically comprise elastic members 28.
  • One end portion of the diaper 10 may be configured as a first waist region 30 of the diaper 10.
  • An opposite end portion of the diaper 10 may be configured as a second waist region 32 of the diaper 10.
  • An intermediate portion of the diaper 10 may be configured as a crotch region 34, which extends longitudinally between the first and second waist regions 30 and 32.
  • the waist regions 30 and 32 may include elastic elements such that they gather about the waist of the wearer to provide improved fit and containment (elastic waist feature 26).
  • the crotch region 34 is that portion of the diaper 10 which, when the diaper 10 is worn, is generally positioned between the wearer's legs.
  • the diaper 10 is depicted in Fig. 1 with its longitudinal axis 36 and its transverse axis 38.
  • the periphery 40 of the diaper 10 is defined by the outer edges of the diaper 10 in which the longitudinal edges 42 run generally parallel to the longitudinal axis 36 of the diaper 10 and the end edges 44 run between the longitudinal edges 42 generally parallel to the transverse axis 38 of the diaper 10.
  • the chassis 12 may also comprise a fastening system, which may include at least one fastening member 46 and at least one stored landing zone 48.
  • an absorbent core 14 can include a compressed strip 15 oriented substantially parallel with the longitudinal axis 36 of the absorbent core 14.
  • the length of the compressed strip 15 can, for example, generally extend within or through the crotch region 34 of the absorbent core 14, and substantially between end edges 44 of the diaper 10.
  • multiple compressed strips 102, 104 can be oriented substantially parallel with the longitudinal axis 36 of the absorbent core 14.
  • the lengths of multiple compressed strips 102, 104 can, for example, generally extend within or through the central region of the absorbent core 14, and substantially between end edges 44 of the diaper 10.
  • Each of the multiple compressed strips 102, 104 could have similar or different lengths.
  • a compressed strip 15 can be provided in the absorbent core 14 by way of mechanical or pressurized compression of a selected portion of the absorbent core 14.
  • the diaper 10 shown in Fig. 1 can also include one or more creases 49 oriented substantially parallel with the longitudinal axis 36 and extending substantially between the end edges 44.
  • one or more creases can extend in directions generally along the longitudinal axis 36, or may extend partially between the end edges 44.
  • one or more creases can include multiple creases oriented substantially parallel with the longitudinal axis 36 and extending substantially between the end edges 44.
  • one or more creases can be slightly offset from the transverse axis 100 and/or each crease may be segmented into multiple parts.
  • the crease 49 can extend substantially through the compressed strip 15.
  • a crease 49 can extend substantially through multiple compressed strips, or in some certain embodiments, a crease may extend adjacent to multiple compressed strips.
  • a crease 49 can include an auxiliary adhesive which is not illustrated in the figures.
  • the auxiliary adhesive may be deposited in the crease 49 when the diaper 10 is folded or compressed along the crease 49.
  • the auxiliary glue may aid in maintaining the relative shape of the crease 49 in the diaper 10.
  • An auxiliary adhesive can include, but is not limited to, sprayable hot melt adhesives, such as H.B. Fuller Co. (St. Paul, MN) Product No. HL-1620-B.
  • the diaper 10 may also include such other features as are known in the art including front and rear ear panels, waist cap features, elastics and the like to provide better fit, containment and aesthetic characteristics. Such additional features are well known in the art and are e.g., described in U.S. Pat. No. 3,860,003 and U.S. Pat. No. 5,151,092.
  • the fastening member 46 may be attached by the fastening member 46 to at least a portion of the second waist region 32 to form leg opening(s) and an article waist.
  • the fastening system When fastened, the fastening system carries a tensile load around the article waist.
  • the fastening system may allow an article user to hold one element of the fastening system, such as the fastening member 46, and connect the first waist region 30 to the second waist region 32 in at least two places. This may be achieved through manipulation of bond strengths between the fastening device elements.
  • the diaper 10 may be provided with a re-closable fastening system or may alternatively be provided in the form of a pant-type diaper.
  • the absorbent article When the absorbent article is a diaper, it may comprise a re-closable fastening system joined to the chassis for securing the diaper to a wearer.
  • the absorbent article When the absorbent article is a pant-type diaper, the article may comprise at least two side panels joined to the chassis and to each other to form a pant.
  • the fastening system and any component thereof may include any material suitable for such a use, including but not limited to plastics, films, foams, nonwoven, woven, paper, laminates, fiber reinforced plastics and the like, or combinations thereof.
  • the materials making up the fastening device may be flexible. The flexibility may allow the fastening system to conform to the shape of the body and thus, reduce the likelihood that the fastening system will irritate or injure the wearer's skin.
  • the chassis 12 and absorbent core 14 may form the main structure of the diaper 10 with other features added to form the composite diaper structure. While the topsheet 18, the backsheet 20, and the absorbent core 14 may be assembled in a variety of well-known configurations, exemplary diaper configurations are described generally in U.S. Pat. No. 5,554,145 entitled "Absorbent Article With Multiple Zone Structural Elastic- Like Film Web Extensible Waist Feature” issued to Roe et al. on Sep. 10, 1996; U.S. Pat. No. 5,569,234 entitled “Disposable PuIl-On Pant” issued to Buell et al. on Oct. 29, 1996; and U.S. Pat. No.
  • topsheet 18 in Fig. 1 may be fully or partially elasticized or may be foreshortened to provide a void space between the topsheet 18 and the absorbent core 14.
  • Exemplary structures including elasticized or foreshortened topsheets are described in more detail in U.S. Pat. No. 5,037,416 entitled “Disposable Absorbent Article Having Elastically Extensible Topsheet” issued to Allen et al. on Aug. 6, 1991; and U.S. Pat. No. 5,269,775 entitled "Trisection Topsheets for Disposable Absorbent Articles and Disposable Absorbent Articles Having Such Trisection Topsheets” issued to Freeland et al. on Dec. 14, 1993.
  • the backsheet 26 may be joined with the topsheet 18.
  • the backsheet 20 may prevent the exudates absorbed by the absorbent core 14 and contained within the diaper 10 from soiling other external articles that may contact the diaper 10, such as bed sheets and undergarments.
  • the backsheet 26 may be substantially impervious to liquids (e.g., urine) and comprise a laminate of a nonwoven and a thin plastic film such as a thermoplastic film having a thickness of about 0.012 mm (0.5 mil) to about 0.051 mm (2.0 mils).
  • Suitable backsheet films include those manufactured by Tredegar Industries Inc. of Terre Haute, Ind. and sold under the trade names X15306, X10962, and X10964.
  • Suitable backsheet materials may include breathable materials that permit vapors to escape from the diaper 10 while still preventing exudates from passing through the backsheet 10.
  • Exemplary breathable materials may include materials such as woven webs, nonwoven webs, composite materials such as film- coated nonwoven webs, and microporous films such as manufactured by Mitsui Toatsu Co., of Japan under the designation ESPOIR NO and by EXXON Chemical Co., of Bay City, Tex., under the designation EXXAIRE.
  • Suitable breathable composite materials comprising polymer blends are available from Clopay Corporation, Cincinnati, Ohio under the name HYTREL blend Pl 8-3097. Such breathable composite materials are described in greater detail in PCT Application No. WO 95/16746, published on Jun. 22, 1995 in the name of E.I. DuPont.
  • Other breathable backsheets including nonwoven webs and apertured formed films are described in U.S. Pat. No. 5,571,096 issued to Dobrin et al. on Nov. 5, 1996.
  • the backsheet of the present invention may have a water vapor transmission rate (WVTR) of greater than about 2000 g/24h/m 2 , greater than about 3000 g/24h/m 2 , greater than about 5000 g/24h/m 2 , greater than about 6000 g/24h/m 2 , greater than about 7000 g/24h/m 2 , greater than about 8000 g/24h/m 2 , greater than about 9000 g/24h/m 2 , greater than about 10000 g/24h/m 2 , greater than about 11000 g/24h/m 2 , greater than about 12000 g/24h/m 2 , greater than about 15000 g/24h/m 2 , measured according to WSP 70.5 (08) at 37.8 0 C and 60% Relative Humidity.
  • WSP 70.5 (08) at 37.8 0 C and 60% Relative Humidity
  • Fig. 2 shows a cross section of Fig. 1 taken along the sectional line 2-2 of Fig. 1.
  • the diaper 10 may comprise the topsheet 18, the components of the absorbent core 14, and the backsheet 20.
  • the diaper 10 can include at least one compressed strip 15 aligned with a crease 49, which together can cooperate to facilitate formation of a concave shape 58 in the diaper 10.
  • the concave shape is also known as a "preformed concave shape" or "preformed shaped” since the concave shape is formed in the diaper 10 prior to use of the diaper 10 by a wearer.
  • the concave shape 58 can have the shape of a slight trough oriented generally in the crotch region 34 of the diaper 10.
  • a diaper with a preformed concave shape can relatively increase bucket volume over conventional diapers. This aspect may be attributed to the concave shape 58 which can generally receive fluids or liquid exudates within the cavity of the concave shape 58.
  • a diaper with a concave shape can have improved fit between a wearer's legs. This aspect may be attributed to the concave shape 58 which generally conforms with the shape of a wearer's body, and thus reduces the relative amount of the diaper 10 which may not conform with the wearer's body.
  • a concave shape can be a concave V-shape. In other certain embodiments, a concave shape can be a concave U-shape. In certain other embodiments, a concave shape can be a surface that bends, narrows, or slopes slightly inward.
  • diaper 10 may also comprise an acquisition system 50 disposed between the liquid permeable topsheet 18 and a wearer facing side of the absorbent core 14.
  • the acquisition system shown in Fig. 1 can include an upper acquisition layer 52 and a lower acquisition layer 54.
  • the acquisition system 50 may, for example, comprise chemically cross-linked cellulosic fibers. Such cross-linked cellulosic fibers may have desirable absorbency properties. Exemplary chemically cross-linked cellulosic fibers are disclosed in US Patent No. 5,137,537.
  • the chemically cross-linked cellulosic fibers are cross- linked with between about 0.5 mole % and about 10.0 mole % of a C 2 to C 9 polycarboxylic cross-linking agent or between about 1.5 mole % and about 6.0 mole % of a C 2 to C 9 polycarboxylic cross-linking agent based on glucose unit.
  • Citric acid is an exemplary cross- linking agent.
  • polyacrylic acids may be used.
  • the cross-linked cellulosic fibers have a water retention value of about 25 to about 60, or about 28 to about 50, or about 30 to about 45. A method for determining water retention value is disclosed in US Patent No. 5,137,537.
  • the cross-linked cellulosic fibers may be crimped, twisted, or curled, or a combination thereof including crimped, twisted, and curled.
  • the acquisition system 50 may comprise a non-woven, which may be hydrophilic. Further, according to a certain embodiment, the acquisition system 50 may comprise the chemically cross-linked cellulosic fibers, which may or may not form part of a nonwoven material. According to another embodiment, the acquisition system 50 may comprise a combination of nonwovens, at least one nonwoven without the cross-linked cellulosic fibers and at least one nonwoven with chemically cross-linked cellulosic fibers. Further, according to an embodiment, the acquisition system 50 may comprise the chemically cross-linked cellulosic fibers mixed with other fibers such as natural or synthetic polymeric fibers. According to other embodiments, such other natural or synthetic polymeric fibers may include high surface area fibers, thermoplastic binding fibers, polyethylene fibers, polypropylene fibers, PET fibers, rayon fibers, lyocell fibers, and mixtures thereof.
  • the acquisition system 50 desirably has a high fluid uptake capability.
  • Fluid uptake is measured in grams of absorbed fluid per gram of absorbent material and is expressed by the value of "maximum uptake.”
  • a high fluid uptake corresponds therefore to a high capacity of the material and is beneficial, because it ensures the complete acquisition of fluids to be absorbed by an acquisition material.
  • MDP Median Desorption Pressure
  • the MDP is a measure of the capillary pressure that is required to dewater the lower acquisition layer 54 to about 50% of its capacity at 0 cm capillary suction height under an applied mechanical pressure of 0.3psi. Generally, a relatively lower MDP may be useful.
  • the methods for determining MDP and maximum uptake are disclosed in U.S. Patent Application 11/600,691 (Flohr et al.).
  • Suitable non-woven materials for the acquisition system 50 can include, but are not limited to SMS material, comprising a spunbonded, a melt-blown and a further spunbonded layer.
  • SMS material comprising a spunbonded, a melt-blown and a further spunbonded layer.
  • permanently hydrophilic non-wovens, and in particular, nonwovens with durably hydrophilic coatings are desirable.
  • Another suitable embodiment comprises a SMMS-structure.
  • the non-wovens are porous.
  • suitable non-woven materials may include, but are not limited to synthetic fibers, such as PE, PET, and PP. As polymers used for nonwoven production may be inherently hydrophobic, they may be coated with hydrophilic coatings.
  • One way to produce nonwovens with durably hydrophilic coatings is via applying a hydrophilic monomer and a radical polymerization initiator onto the nonwoven, and conducting a polymerization activated via UV light resulting in monomer chemically bound to the surface of the nonwoven as described in co-pending U.S. Patent Publication No. 2005/0159720.
  • Another way to produce nonwovens with durably hydrophilic coatings is to coat the nonwoven with hydrophilic nanoparticles as described in co-pending applications U.S. Patent No. 7,112,621 to Rohrbaugh et al. and in PCT Application Publication WO 02/064877.
  • Nanoparticles typically have a largest dimension of below 750 nm. Nanoparticles with sizes ranging from 2 to 750 nm may be economically produced. An advantage of nanoparticles is that many of them can be easily dispersed in water solution to enable coating application onto the nonwoven, they typically form transparent coatings, and the coatings applied from water solutions are typically sufficiently durable to exposure to water. Nanoparticles can be organic or inorganic, synthetic or natural. Inorganic nanoparticles generally exist as oxides, silicates, and/or, carbonates. Typical examples of suitable nanoparticles are layered clay minerals (e.g., LAPONITETM from Southern Clay Products, Inc.
  • a suitable nanoparticle coated non-woven is that disclosed in the co-pending patent application Ser. No. 10/758,066 entitled "Disposable absorbent article comprising a durable hydrophilic core wrap" to Ekaterina Anatolyevna Ponomarenko and Mattias NMN Schmidt.
  • the nonwoven surface can be pre-treated with high energy treatment (corona, plasma) prior to application of nanoparticle coatings.
  • High energy pre-treatment typically temporarily increases the surface energy of a low surface energy surface (such as PP) and thus enables better wetting of a nonwoven by the nanoparticle dispersion in water.
  • the absorbent core 14 may further comprise any absorbent material that is generally compressible, conformable, non-irritating to the wearer's skin, and capable of absorbing and retaining liquids such as urine and other certain body exudates.
  • the absorbent core 14 may comprise a wide variety of liquid-absorbent materials commonly used in disposable diapers and other absorbent articles such as comminuted wood pulp, which is generally referred to as airfelt, creped cellulose wadding, melt blown polymers, including co-form, chemically stiffened, modified or cross-linked cellulosic fibers, tissue, including tissue wraps and tissue laminates, absorbent foams, absorbent sponges, or any other known absorbent material or combinations of materials.
  • the absorbent core 14 may further comprise minor amounts (typically less than about 10%) of materials, such as adhesives, waxes, oils and the like.
  • a printing system 130 for making an absorbent core 14 for a diaper 10 in accordance with an embodiment of the invention is illustrated in Fig. 6.
  • the printing system 130 may generally comprise a first printing unit 132 for forming a first absorbent layer 60 of the absorbent core 14 and a second printing unit 134 for forming a second absorbent layer 62 of the absorbent core 14.
  • the first printing unit 132 may comprise a first auxiliary adhesive applicator 136 for applying an auxiliary adhesive to a substrate 64, which may be a nonwoven web, a first rotatable support roll 140 for receiving the substrate 64, a hopper 142 for holding absorbent particulate polymer material 66, a printing roll 144 for transferring the absorbent particulate polymer material 66 to the substrate 64, and a thermoplastic adhesive material applicator 146 for applying a thermoplastic adhesive material 68 to the substrate 64 and the absorbent particulate polymer 66 material thereon.
  • a substrate 64 which may be a nonwoven web
  • a first rotatable support roll 140 for receiving the substrate 64
  • a hopper 142 for holding absorbent particulate polymer material 66
  • a printing roll 144 for transferring the absorbent particulate polymer material 66 to the substrate 64
  • a thermoplastic adhesive material applicator 146 for applying a thermoplastic adhesive material 68 to the substrate 64 and the absorbent particulate polymer
  • the second printing unit 134 may comprise a second auxiliary adhesive applicator 148 for applying an auxiliary adhesive to a second substrate 72, a second rotatable support roll 152 for receiving the second substrate 72, a second hopper 154 for holding an absorbent particulate polymer material 74, a second printing roll 156 for transferring the absorbent particulate polymer material 74 from the hopper 154 to the second substrate 72, and a second thermoplastic adhesive material applicator 158 for applying a thermoplastic adhesive material 76 to the second substrate 72 and the absorbent particulate polymer material 74 thereon.
  • a second auxiliary adhesive applicator 148 for applying an auxiliary adhesive to a second substrate 72
  • a second rotatable support roll 152 for receiving the second substrate 72
  • a second hopper 154 for holding an absorbent particulate polymer material 74
  • a second printing roll 156 for transferring the absorbent particulate polymer material 74 from the hopper 154 to the second substrate 72
  • the printing system 130 also includes a guide roller 160 for guiding the formed absorbent core from a nip 162 between first and second rotatable support rolls 140 and 152.
  • the first and second auxiliary applicators 136 and 148 and the first and second thermoplastic adhesive material applicators 146 and 158 may be a nozzle system which can provide a relatively thin but wide curtain of thermoplastic adhesive material.
  • the first rotatable support roll 140 which has the same structure as the second rotatable support roll 152, comprises a rotatable drum 164 and a peripheral vented support grid 166 for receiving the first substrate 64.
  • the first printing roll 144 which has the same structure as the second printing roll 156, comprises a rotatable drum 168 and a plurality of absorbent particulate polymer material reservoirs 170 in a peripheral surface 172 of the drum 168.
  • the reservoirs 170 best illustrated in Fig. 9, may have a variety of shapes, but in a particular embodiment, are conical.
  • the reservoirs 170 may lead to an air passage 174 in the drum 168 and comprise a vented cover 176 for holding adhesive particulate polymer material 66 in the reservoir and preventing the adhesive particulate polymer material 66 from falling or being pulled into the air passage 174.
  • a second nip 163 between first and second rotatable compression rolls 165 and 167 can form one or more compression strips, such as 15 in Fig. 1, in the absorbent core 14.
  • the compression rolls 165 and 167 may be a suitable width for forming a similarly sized compression strip in the absorbent core 14.
  • at least one of the compression rolls 165 and 167 may include a suitable pattern for forming a correspondingly sized compression strip in the absorbent core 14.
  • one or more jets of pressurized air or another medium could be used to form at least one compression strip in the absorbent core 14.
  • the printing system 130 receives the first and second substrate 64 and 72 into the first and second printing units 132 and 134, respectively, the first substrate 64 is drawn by the rotating first support roll 140 past the first auxiliary adhesive applicator 136 which applies the first auxiliary adhesive to the first substrate 64 in a pattern such as described hereinabove.
  • a vacuum (not shown) within the first support roll 140 draws the first substrate 64 against the vertical support grid 166 and holds the first substrate 64 against the first support roll 140. This presents an uneven surface on the first substrate 64. Due to gravity, or by using the vacuum means, the substrate 64 will follow the contours of the uneven surface and thereby the substrate 64 will assume a mountain and valley shape.
  • the absorbent particulate polymer material 66 may accumulate in the valleys presented by the substrate 64.
  • the first support roll 140 then carries the first substrate 64 past the rotating first printing roll 144 which transfers the absorbent particulate polymer material 66 from the first hopper 142 to the first substrate 64 in a grid pattern 92.
  • a vacuum (not shown) in the first printing roll 144 may hold the absorbent particulate polymer material 66 in the reservoirs 170 until time to deliver the absorbent particulate polymer material 66 to the first substrate 64.
  • the vacuum may then be released or air flow through the air passages 174 may be reversed to eject the absorbent particulate polymer material 66 from the reservoirs and onto the first substrate 64.
  • the absorbent particulate polymer material 66 may accumulate in the valleys presented by the substrate 64.
  • the support roll 140 then carries the printed first substrate 64 past the thermoplastic adhesive material applicator 136 which applies the thermoplastic adhesive material 68 to encase the absorbent particulate polymer material 66 on the first substrate 64.
  • the uneven surface of the vented support grid 166 of the support rolls 140 and 152 determines the distribution of absorbent particulate polymeric material 66 and 74 throughout the absorbent core 14 and likewise determines the pattern of junction areas.
  • the second rotatable support roll draws the second substrate 72 past the second auxiliary adhesive applicator 148 which applies an auxiliary adhesive to the second substrate 72 in any predefined pattern.
  • the second rotatable support roll 152 then carries the second substrate 72 past the second printing roll 156 which transfers the absorbent particulate polymer material 74 from the second hopper 154 to the second substrate 72 and deposits the absorbent particulate polymer material 74 in a grid pattern on the second substrate 72 in the same manner as described with regard to the first printing unit 132 above.
  • the second thermoplastic adhesive material applicator 158 then applies the thermoplastic adhesive material 76 to encase the absorbent particulate polymer material 74 on the second substrate 72.
  • the printed first and second substrates 64 and 72 then pass through the nip 162 between the first and second support rolls 140 and 152 for compressing the first absorbent layer 60 and second absorbent layer 62 together to form the absorbent core 14.
  • the absorbent core 14 then passes through nip 163 between the first and second compression rolls 165 and 167 for forming at least one compression strip in the absorbent core 14.
  • various lengths of the absorbent core 14 can be cut into predefined sections for use in an absorbent article, such as a diaper 10.
  • an outer covering 16 may be placed upon or otherwise combined with the substrates 64 and 72, the absorbent particulate polymer material 66 and 74, and the thermoplastic adhesive material 68 and 76.
  • the outer covering 16 and the respective substrate 64 and 72 may be provided from a unitary sheet of material.
  • the unfinished diaper 200 can be fed to a folding device 202 or process, wherein the unfinished diaper 200 is folded and compressed.
  • the unfinished diaper 200 is folded and compressed along a longitudinal axis 204, similar to 36 in Fig. 1, wherein at least one crease 206 can be formed in the diaper 208.
  • an unfinished diaper 200 can be folded and compressed along one or more lines substantially parallel with the longitudinal axis 204, wherein a corresponding number of creases can be formed in the diaper.
  • the diaper 208 can include a preformed concave V-shape, similar to 58 shown in Fig. 2, within the crotch region of the diaper 208.
  • an auxiliary adhesive can be applied to any portion of the crease 206 by an adhesive application device 210.
  • the auxiliary adhesive may be deposited in the crease 206 when the diaper 208 is folded or compressed along the crease 206 by the folding device 202 or process.
  • the auxiliary adhesive may aid in maintaining the relative shape of the crease 206 in the diaper 208.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Manufacturing & Machinery (AREA)
  • Botany (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

L'invention porte sur un article absorbant jetable qui comprend une partie centrale absorbante et un châssis qui comprend une feuille supérieure et une feuille postérieure, la partie centrale absorbante étant située entre la feuille supérieure et la feuille postérieure. Le châssis comprend la partie centrale absorbante qui comprend un matériau polymère particulaire absorbant, et la partie centrale absorbante est située entre la feuille supérieure et la feuille postérieure, et comprend au moins une bande s'étendant à travers une partie de la région d'entrejambe de l'article. L'article comprend également au moins un pli orienté longitudinalement, passant à travers une partie de la région d'entrejambe, une forme concave étant formée à l'intérieur de l'article.
EP09763309A 2008-06-13 2009-06-04 Couche ou culotte à meilleur ajustement avec matériau polymère particulaire absorbant et entrejambe préformé Withdrawn EP2285333A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6113808P 2008-06-13 2008-06-13
PCT/US2009/046203 WO2009152018A1 (fr) 2008-06-13 2009-06-04 Couche ou culotte à meilleur ajustement avec matériau polymère particulaire absorbant et entrejambe préformé

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EP2285333A1 true EP2285333A1 (fr) 2011-02-23

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EP (1) EP2285333A1 (fr)
JP (1) JP2011522606A (fr)
CN (1) CN102065816A (fr)
BR (1) BRPI0915014A2 (fr)
CA (1) CA2727408A1 (fr)
MX (1) MX2010013786A (fr)
WO (1) WO2009152018A1 (fr)

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Publication number Publication date
JP2011522606A (ja) 2011-08-04
CA2727408A1 (fr) 2009-12-17
CN102065816A (zh) 2011-05-18
MX2010013786A (es) 2010-12-21
BRPI0915014A2 (pt) 2015-10-27
WO2009152018A1 (fr) 2009-12-17

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