US20150223990A1 - Method and Apparatus for Making an Absorbent Structure Comprising Channels - Google Patents

Method and Apparatus for Making an Absorbent Structure Comprising Channels Download PDF

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Publication number
US20150223990A1
US20150223990A1 US14/615,467 US201514615467A US2015223990A1 US 20150223990 A1 US20150223990 A1 US 20150223990A1 US 201514615467 A US201514615467 A US 201514615467A US 2015223990 A1 US2015223990 A1 US 2015223990A1
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United States
Prior art keywords
absorbent
moving endless
absorbent material
channels
supporting
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Abandoned
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US14/615,467
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English (en)
Inventor
Peter Armstrong-Ostle
Jan Michael Trinkaus
Lothar Volker Kuntze
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Procter and Gamble Co
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Procter and Gamble Co
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Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Assigned to THE PROCTER & GAMBLE COMPANY reassignment THE PROCTER & GAMBLE COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARMSTRONG-OSTLE, PETER, KUNTZE, LOTHAR VOLKER, TRINKAUS, JAN MICHAEL
Publication of US20150223990A1 publication Critical patent/US20150223990A1/en
Priority to US16/546,923 priority Critical patent/US11090199B2/en
Abandoned legal-status Critical Current

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    • 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
    • A61F13/15634—Making fibrous pads between sheets or webs
    • 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
    • A61F13/15699—Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
    • 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
    • A61F13/15764—Transferring, feeding or handling devices; Drives
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B32B37/1292—Application of adhesive selectively, e.g. in stripes, in patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/18—Handling of layers or the laminate
    • 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
    • A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
    • A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
    • A61F2013/1591—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding via adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1702—For plural parts or plural areas of single part
    • Y10T156/1744—Means bringing discrete articles into assembled relationship
    • Y10T156/1751—At least three articles
    • Y10T156/1761—Stacked serially

Definitions

  • the present invention relates to an apparatus and method for making an absorbent structure with channels embedded within the absorbent structure.
  • the channels are strips that are free of absorbent material.
  • Absorbent articles such as diapers and sanitary napkins, 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 absorbent material such as super absorbent polymers that absorbs very high quantities of liquid and causes the absorbent article to swell significantly. Such articles will thus increase significantly in volume during use, and sometimes in particular in the crotch area between the wearer's legs, which may render the article uncomfortable.
  • improved liquid transportation can be achieved by the provision of transportation channels for distributing liquid in the absorbent article, e.g., the absorbent structure thereof. Furthermore, it has surprisingly been found that the amount of absorbent material can be reduced hereby, whilst maintaining the performance. It has been found that improved fit can be obtained by providing absorbent articles with absorbent structures whereby the absorbent material is structured in machine direction, optionally with areas that comprise less or no absorbent material, for improved bending flexibility in use (in the direction corresponding to the machine direction).
  • EP-A-2 532 329 published on Dec. 12, 2012, discloses an apparatus and method for producing an absorbent structure comprising at least two supporting sheets and a layer of absorbent material deposited, preferably by a printing process, onto at least one of the supporting sheets. It discloses a separate pressure roll which may selectively apply pressure only onto the channel area of the absorbent structure.
  • the pressure means may comprise raised mating strips.
  • the present invention relates to an apparatus for making an absorbent structure for an absorbent article, comprising a supporting sheet and thereon an absorbent layer, the absorbent layer comprising an absorbent material, the apparatus comprising:
  • a feeder for feeding the absorbent material onto at least the first supporting sheet at a depositing point on the first moving endless surface, the absorbent material forming absorbent regions upon the supporting sheet, and one or more channels between the absorbent regions, the channels being substantially free of absorbent material;
  • an adhesive applicator for applying adhesive to at least one of the first and second supporting sheets, at least within the region of the channels.
  • the present invention further relates to a method for making an absorbent structure comprising a supporting sheet and thereon an absorbent layer of absorbent material, the method comprising the steps of:
  • the present invention addresses the problem of ensuring accurate registration between the pattern of regions free of absorbent material formed in the depositing or printing step, and the pressure applied by separate pressure rolls in a downstream gluing step.
  • the present invention combines the depositing or printing step and the pressure step which forms the channels by adhesion onto a single moving endless surface, e.g., a roll.
  • a first moving endless surface which has one or more substantially longitudinally extending first mating strips, and at least one further auxiliary moving endless surface is provided which acts against the first mating strips. Pressure is applied between the first endless moving surface and the auxiliary moving endless surface to the first and second supporting sheets at least within a part of an area of the channels, so as to adhere together the first and second supporting sheets.
  • second and third auxiliary moving endless surfaces are provided such that the first moving endless surface which carries the first and second supporting sheets passes under pressure between the second and third auxiliary moving endless surfaces.
  • FIG. 1B is a top view of an alternative reservoir 25 .
  • FIG. 2 is a side view of an apparatus of the present invention, or used in the method of the invention.
  • FIG. 3 is a partial perspective view of an apparatus of the present invention, or used in a method of the invention.
  • FIG. 4 is a partial perspective view of an alternative apparatus of the present invention, or used in an alternative method of the invention.
  • FIG. 5A is a schematic representation of a single auxiliary bonding roll.
  • FIG. 5B is a schematic representation of an alternative embodiment comprising two opposing auxiliary bonding rolls.
  • FIG. 5C is a schematic representation of another alternative embodiment comprising an auxiliary bonding roll and opposing support roll.
  • FIG. 5D is a schematic representation of another alternative embodiment comprising an auxiliary bonding belt.
  • this invention encompasses a method and apparatus for making an absorbent structure useful for an absorbent article comprising absorbent material, preferably comprising at least, or only, particulate superabsorbent polymer material. Embodiments of such method and apparatus and resulting absorbent structures and absorbent articles are further described herein, after the following definitions.
  • “Absorbent structure” refers to a three-dimension structure with a longitudinal dimension and, perpendicular thereto, a transverse dimension, and, perpendicular to both, a height dimension, and that comprises at least an absorbent material and a supporting sheet, and that is useful in an absorbent article.
  • Absorbent layer refers to a three dimensional layer of absorbent material, formed by deposition of absorbent material onto the supporting sheet.
  • “Absorbent material” refers to a material or mixture of materials that can absorb and retain bodily fluids; it typically includes or consists of “superabsorbent polymer material”.
  • “Superabsorbent polymer material” also known as “absorbent gelling material,” or “AGM,” or “superabsorbent,” refer to polymeric material that can absorb at least 10 times (and typically at least 15 times, or at least 20 times) their weight of an aqueous 0.9% saline solution as measured using the Centrifuge Retention Capacity test (Edana 441.2-02), i.e. having a CRC of at least 10 g/g, and typically at least 15 g/g or at least 20 g/g.
  • “Absorbent article” refers to a device that absorbs and contains 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 adult and infant diapers, including pants, such as infant training pants and adult incontinence undergarments, and feminine hygiene products, such as sanitary napkins and panty-liners and adult incontinent pads, and breast pads, care mats, bibs, wound dressing products, and the like.
  • Absorbent articles may further include floor cleaning articles, food industry articles, and the like.
  • body fluids” or “body exudates” includes, but is not limited to, urine, blood, vaginal discharges, breast milk, sweat and fecal matter.
  • 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.
  • Pant or “training pant”, as used herein, refer to diaper 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. Pat. No. 5,246,433, issued to Hasse, et al. on Sep. 21, 1993; U.S. Pat. No. 5,569,234, issued to Buell et al. on Oct. 29, 1996; U.S. Pat. No. 6,120,487, issued to Ashton on Sep. 19, 2000; U.S. Pat. No. 6,120,489, issued to Johnson et al. on Sep. 19, 2000; U.S. Pat. No.
  • 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).
  • Porate is used herein to refer to a material which is in particulate form so as to be flowable in the dry state.
  • substantially cellulose free is used herein to describe an article, such as an absorbent layer structure or core, that contains less than 5% by weight cellulosic fibers.
  • absorbent material 100 may be fed onto the supporting sheet 16 , 16 ′ by any suitable means including gravimetric feeding or by using a print roll.
  • any suitable means including gravimetric feeding or by using a print roll.
  • the print roll method is used which is described in more detail below.
  • FIGS. 1A and 1B illustrate examples of patterns which provide a reservoir 25 for holding absorbent material prior to depositing, or printing the absorbent material onto a supporting web.
  • Absorbent material is fed to the reservoir, the reservoir holds absorbent material in each of the holes or cavities 22 .
  • the reservoirs contain one or more channels 21 between the absorbent regions, the channels 21 being substantially free of absorbent material.
  • the reservoirs are disposed around the outer surface of print rolls 144 , 156 .
  • the absorbent material 100 is delivered to the supporting sheet 16 by a roll 156 placed adjacent and in close proximity to the first moving endless surface 30 , for example substantially above the surface.
  • the absorbent material 100 may be deposited substantially continuously.
  • the point or area where the absorbent material 100 leaves the roll 156 and transfers to the first moving endless surface 30 is herein referred to as the depositing point or area; and in this point or area a raised strip 21 , e.g., each raised strip, mates with a mating strip 31 , e.g. without direct contact.
  • a first printing unit 134 for making an absorbent structure in accordance with the first aspect of this invention is illustrated on the left half in FIG. 2 .
  • a second printing unit 132 for forming a second absorbent structure is represented on the right side of FIG. 2 , both absorbent structures being then combined into an absorbent core in the nip 162 .
  • the first printing unit 134 comprises an auxiliary adhesive applicator 148 for applying an auxiliary adhesive to the substrate 16 , a first rotatable support roll 152 for receiving the first substrate 16 , a first hopper 154 for holding the absorbent particulate polymer material, a first printing roll 156 for transferring the absorbent particulate polymer material from the hopper 154 to the substrate 16 , and a thermoplastic adhesive material applicator 158 for applying the fibrous thermoplastic adhesive material 74 to the first substrate 16 and the absorbent particulate polymer material land areas thereon.
  • the auxiliary adhesive applicator 148 may be a nozzle system which can provide a relatively thin but wide curtain of thermoplastic adhesive material as suggested in WO 2008/155699, but may instead advantageously comprise a slot coater for applying several slots of auxiliary adhesive simultaneously along the width of the substrate and fitted with a manifold to intermittently stop the delivery of the auxiliary adhesive so that there the auxiliary layer is not applied in the area of the substrate corresponding to the zones of lower absorbent material amount.
  • the printing roll 156 and adhesive applicator 158 may be as further detailed in WO 2008/155699.
  • the absorbent structure 70 obtained by the printing unit 134 may be directly put in face to face relation with a second substrate 16 ′, or may be combined with a second absorbent structure 70 ′ to form an absorbent core.
  • This second absorbent structure 70 ′ may be formed on the second printing unit 132 as shown in FIG. 2 , which may be generally identical to the first printing unit 134 .
  • the second printing unit 132 may comprise a second auxiliary adhesive applicator 136 which may be a slot coater for applying an auxiliary adhesive to the substrate 16 ′, a second rotatable support roll 140 for receiving the substrate 16 ′, a second hopper 142 for holding absorbent particulate polymer material, a second printing roll 144 for transferring the absorbent particulate polymer material to the substrate 16 ′, and a thermoplastic adhesive material applicator 146 for applying the thermoplastic adhesive material 74 ′ to the substrate 16 ′ and the absorbent particulate polymer land areas thereon.
  • a second auxiliary adhesive applicator 136 which may be a slot coater for applying an auxiliary adhesive to the substrate 16 ′
  • a second rotatable support roll 140 for receiving the substrate 16 ′
  • a second hopper 142 for holding absorbent particul
  • the radius of the roll 156 may depend on what absorbent structure is produced, e.g. what size, and for example how many structures are produced per cycle of the print roll or drum.
  • the drum/print roll may have a radius of at least 40 mm, or of at least 50 mm; it may be for example up to 300 mm, or up to 200 mm.
  • the radius of the drum/print roll is less than 50% of the radius of the first moving endless surface.
  • the radius of the print roll is from 60 mm to 80 mm.
  • the roll 156 may have any suitable width, but for example a width (for example in CD, hence perpendicular to MD) corresponding (substantially) to the width of the absorbent structure to be produced; this for example be at least 40 mm, or at least 60 mm, or for example up to 400 mm, or up to 200 mm.
  • the roll 156 may have one or more reservoirs 25 with a certain volume for receiving the absorbent material 100 therein, and transporting it to and then depositing it on the supporting sheet 16 on the first moving endless surface.
  • Each reservoir 25 corresponds typically to an absorbent structure to be produced, as suitable for an absorbent article.
  • first and second supporting sheets are carried on first and second moving endless surfaces.
  • these first and second moving endless surfaces are illustrated by drums, referred to herein as lay-down drums 140 , 152 .
  • the moving endless surfaces could be belts.
  • the supporting sheets 16 , 16 ′ are preferably sheets of nonwoven material. Absorbent material is deposited onto at least one, and preferably both, of the supporting sheets from the roll 156 , except in the regions corresponding to the raised strips 21 and the mating strips 31 .
  • the first roll 152 has one or more substantially longitudinally extending first mating strips 31
  • the second roll 140 has corresponding longitudinally extending second mating strips. Pressure is applied through the first mating strips against an auxiliary bonding roll 160 to the first and second supporting sheets 16 , 16 ′ at least within a part of the area of the channels, so as to adhere together the first and second supporting sheets.
  • the first and second moving endless surfaces 140 , 152 may for example have a speed of at least 1000, or at least 1200 parts per minute and/or a linear speed of at least 4.5 m/s, or at least 6 m/s, or at least 8 m/s, or at least 10 m/s.
  • FIG. 3 illustrates the side-by side arrangement of the print roll 156 and the lay-down drum 152 .
  • the drum is a rotating cylindrical drum.
  • the outer shell rotates around a stationary inner chamber, e.g. a stator.
  • the rotating outer shell carries one or more receptacles 33 which receive absorbent material from the print roll 156 .
  • the receptacle 33 is at least partially air-permeable. It may have an area that serves to receive the absorbent material, and this area is substantially in air-communication with a vacuum system via vacuum chambers 38 . This arrangement holds the supporting sheet 16 onto the surface of the lay-down drum 30 , and may also hold the absorbent material received from the print roll 156 in place against the surface of the supporting sheet 16 , if the supporting web is air permeable.
  • the receptacle area 33 other than the mating strips 31 is a mesh material that has apertures, is air permeable, and is in air communication with the chambers 38 of the vacuum system.
  • the surface area of the receptacle 33 other than the mating strips 31 , comprises thin supports substantially in transverse direction, for supporting the supporting sheet 16 .
  • the maximum dimension in the longitudinal direction is less than the average width dimension of the adjacent mating strip; for example at most 4 mm, preferably at most 3 mm.
  • the receptacle 33 comprises a multitude of substantially longitudinally extending rods 36 , spaced apart from one another, and typically from a neighbouring mating strip, in transverse direction. Such rods 36 may then partially form the most outer surface of the receptacle 33 , so that the supporting sheet 16 is received and carried by the rods 36 and the mating strips 31 .
  • Pressure is applied between the corresponding first mating strips on the lay-down drum and the auxiliary bonding roll 160 which presses against the first and second supporting webs, specifically in the regions in which the absorbent structure is free of any absorbent material.
  • the combination of pressure and adhesive material between the supporting webs causes the supporting webs to adhere together in these regions and thus forms one or more channels.
  • the application of pressure can be accurately registered with the regions which are free of absorbent material because both the deposit of absorbent material and the application of pressure take place on the same surface, namely the lay-down drum, receptacle 33 . It is preferred to avoid applying any pressure to the absorbent material which is sandwiched between the supporting webs. Such pressure could cause absorbent material particles to damage or even puncture or tear the supporting web.
  • the area over which pressure is applies between the mating surfaces is preferably slightly narrower and preferably also slightly shorter than the region in which the absorbent material is free of any absorbent material.
  • the first mating strips 31 are made from a metallic material, preferably steel and the auxiliary bonding roll is made from an elastic material, preferably silicone, or vice versa.
  • the process is controlled in order to maintain the desired pressure between the mating strips on the lay-down drum and the corresponding mating strips on the auxiliary bonding roll 160 .
  • the applied pressure is an important process parameter for achieving required channel bond strength in the finished article.
  • reference is made to pressure applied between two drums, however the principles may equally be applied to other forms of moving endless surfaces, such as belts, rollers, and combinations thereof.
  • each drum is mounted on a shaft, and each shaft is rotated at a set speed by means of a drive, for example an electric motor.
  • a drive for example an electric motor.
  • the auxiliary bonding roll 160 may be rotated by the contact between the drum 30 .
  • Each shaft is supported in a backplate which, in turn, is mounted directly or indirectly in the machine frame.
  • the drum 30 has a fixed axis, whilst the axis of auxiliary bonding roll moveable, with the axis of the drum and auxiliary bonding roll staying parallel.
  • the auxiliary bonding roll is pressed against the surface of the drum with a controlled force greater than 20N, preferably between 50-3000N.
  • the applied pressure is controlled pneumatically, by adjusting the distance between the drum and the auxiliary bonding roll, for example by means of cylinder air pressure.
  • the pressure may be applied between two auxiliary bonding rolls 160 , 161 , as in FIG. 5B , or by means of two or more auxiliary bonding rolls 160 , as in FIG. 5C , or by means of a belt 164 , as in FIG. 5D .
  • the preferred process pressure between the lay-down drum and the auxiliary bonding roll is from 0.3 to 0.8 MPa.
  • the drums are mounted onto the shaft and the free end of the shaft is referred to as the outside section of the shaft, whereas the opposing end of the shaft is referred to as the drive-side section of the shaft.
  • the absorbent material 100 herein is preferably a flowable material, in the dry state, most preferably a particulate material.
  • the absorbent material may be particles, flakes, fibers, spheres, agglomerated particles and other forms known in the art.
  • the absorbent material 100 comprises superabsorbent polymer material, optionally combined with cellulosic material, including for example cellulose, comminuted wood pulp in the form of fibers.
  • the absorbent material 100 may comprise at least 60%, or at least 70% by weight of superabsorbent polymer material, and at the most 40% or at the most 30% of cellulosic material.
  • the absorbent layer comprises absorbent material 100 that consists substantially of absorbent polymer material, e.g., less than 5% by weight of the absorbent material of cellulosic material is present; and the absorbent layer/absorbent structure, may be substantially or even completely free of cellulosic material.
  • the absorbent material is a superabsorbent polymer material, herein referred to as SAP, and also known as particulate absorbent gelling material, AGM.
  • SAP superabsorbent polymer material
  • AGM particulate absorbent gelling material
  • the particulate SAP herein may have a high sorption capacity, e.g. having a CRC of for example at least 20 g/g, or at 30 g/g. Upper limits may for example be up to 150 g/g, or up to 100 g/g.
  • the particulate SAP may have a good permeability for liquid, for example, having a SFC value of at least 10 ⁇ 10 ⁇ 7 cm 3 s/g; or preferably at least 30 ⁇ 10 ⁇ 7 cm 3 ⁇ s/g, or at least 50 ⁇ 10 ⁇ 7 cm 3 s/g 10 ⁇ 10 ⁇ 7 cm 3 s/g, or possibly permeability SFC value of at least 100 ⁇ 10 ⁇ 7 cm 3 s/g, or at least a SFC of 120 ⁇ 10 ⁇ 7 cm 3 sec/g.
  • This SFC is a measure of permeability and an indication of porosity is provided by the saline flow conductivity of the gel bed as described in U.S. Pat. No.
  • the polymers of the SAP are internally cross-linked and/or surface crosslinked polymers.
  • the absorbent material 100 comprising or consisting of particles of polyacrylic acids/polyacrylate polymers, for example having a neutralization degree of from 60% to 90%, or about 75%, having for example sodium counter ions, as known in the art; they may be surface crosslinked and/or internally crosslinked polyacrylic acid/polyacrylate polymers.
  • the absorbent material 100 is in the form of particles with, a mass medium particle size up to 2 mm, or between 50 microns and 2 mm or to 1 mm, or preferably from 100 or 200 or 300 or 400 or 500 ⁇ m, or to 1000 or to 800 or to 700 ⁇ m; as can for example be measured by the method set out in for example EP-A-0691133.
  • the material is in the form of particles of which at least 80% by weight are particles of a size between 50 ⁇ m and 1200 ⁇ m and having a mass median particle size between any of the range combinations above.
  • the particles may be essentially spherical, or may have some other shape.
  • the absorbent material 100 has a relatively narrow range of particle sizes, e.g., with the majority (e.g., at least 80% or preferably at least 90% or even at least 95% by weight) of particles having a particle size between 50 ⁇ m and 1000 ⁇ m, preferably between 100 ⁇ m and 800 ⁇ m, and more preferably between 200 ⁇ m and 600 ⁇ m.
  • the majority e.g., at least 80% or preferably at least 90% or even at least 95% by weight
  • the absorbent material 100 herein may advantageously comprise less than 15% by weight of water, or less than 10%, or less than 8% or less than 5%.
  • the water-content can be determined by the Edana test, number ERT 430.1-99 (February 1999) which involves drying the particulate material 100 at 105° Celsius for 3 hours and determining the moisture content by the weight loss of the particulate material 100 after drying.
  • the particulate SAP herein may be particles of SAP that are surface coated or surface treated (this not including surface-crosslinking, which may be an additional surface-treatment); such coatings and surface treatment steps are well known in the art, and include surface treatment with one or more inorganic powders, including silicates, phosphates, and coatings of polymeric material, including elastomeric polymeric materials, or film-forming polymeric materials.
  • the absorbent structure produced with the apparatus 1 and method of the invention comprises a supporting sheet 200 , to receive the absorbent material.
  • This supporting sheet 200 may be any individual sheet or web sheet material, in particular paper, films, wovens or nonwovens, or laminate of any of these.
  • the supporting sheet 200 is a nonwoven, e.g., a nonwoven web, such as a carded nonwoven, spunbond nonwoven or meltblown nonwoven, and including nonwoven laminates of any of these.
  • the fibers may be of natural or man-made origin and may be staple or continuous filaments or be formed in situ. Commercially available fibers have diameters ranging typically from less than about 0.001 mm to more than about 0.2 mm and they come in several different forms: short fibers (known as staple, or chopped), continuous single fibers (filaments or monofilaments), untwisted bundles of continuous filaments (tow), and twisted bundles of continuous filaments (yarn).
  • the fibers may be bicomponent fibers, for example having a sheet-core arrangement, e.g., with different polymers forming the sheet and the core.
  • Nonwoven fabrics can be formed by many processes such as meltblowing, spunbonding, solvent spinning, electrospinning, and carding.
  • the nonwoven herein may be made of hydrophilic fibers; “Hydrophilic” describes fibers or surfaces of fibers, which are wettable by aqueous fluids (e.g., aqueous body fluids) deposited on these fibers. Hydrophilicity and wettability are typically defined in terms of contact angle and the strike through time of the fluids, for example through a nonwoven fabric. This is discussed in detail in the American Chemical Society publication entitled “Contact angle, wettability and adhesion”, edited by Robert F. Gould (Copyright 1964).
  • a fiber or surface of a fiber is said to be wetted by a fluid (i.e., hydrophilic) when either the contact angle between the fluid and the fiber, or its surface, is less than 90°, or when the fluid tends to spread spontaneously across the surface of the fiber, both conditions are normally co-existing.
  • a fiber or surface of the fiber is considered to be hydrophobic if the contact angle is greater than 90° and the fluid does not spread spontaneously across the surface of the fiber.
  • the supporting sheet 200 herein may be air-permeable. Films useful herein may therefore comprise micro pores. Nonwovens herein may for example be air permeable.
  • the supporting sheet 200 may have for example an air-permeability of from 40 or from 50, to 300 or to 200 m 3 /(m 2 ⁇ min), as determined by EDANA method 140-1-99 (125 Pa, 38.3 cm 2 ).
  • the supporting sheet 200 may alternatively have a lower air-permeability, e.g. being non-air-permeable, to for example be better detained on a moving surface comprising vacuum.
  • the supporting sheet 200 is a nonwoven laminate material, a nonwoven laminate web, for example of the SMS or SMMS type.
  • the basis weight of nonwoven fabrics is usually expressed in grams per square meter (gsm).
  • the supporting sheet 200 may have a basis weight that is less than 60 gsm, or for example than 50 gsm, for example from 5 gsm to 40 gsm, or to 30 gsm.
  • the supporting sheet 200 may have a transverse-extensibility or a longitudinal-extensibility, for example of more the 20%, or for example more than 100%, but for example not more than 200%.
  • the supporting sheet 200 has a transverse dimension that is more than the transverse dimension of the part of the receptacle ( 33 ), e.g. at least 10%, or for example at 20% or at least 30%, and for example up to about 120%.
  • the supporting sheet 200 is treated with an adhesive prior to, at, and/or after transfer to the moving endless surface.
  • the apparatus 1 herein comprises adhesive application unit(s) 50 , 51 .
  • the method herein also comprises such an adhesive application step.
  • This adhesive may be applied uniformly and/or continuously, to aid absorbent material 100 immobilization and then it may help to adhere the supporting sheet 200 to a further material that may overlay the absorbent layer, as described below.
  • it may be applied in a pattern. It may be applied by spraying, or for example by selectively slot-coating; the apparatus 1 may thus comprise a slot-coater, with a pattern.
  • the adhesive may be applied on those portions of the supporting sheet 200 that are to receive to receive the absorbent material; then, it helps to immobilize the absorbent material 100 thereon (e.g., to ensure the absorbent material 100 will stay substantially as applied, with the channels, preferably not only during manufacturing, but also during storage and in use (at least during part of the use). Or, alternatively, only on those portions of the supporting sheet 200 that are to be on the mating strips 31 ; then it may help to adhere the supporting sheet 200 to a further material that may overlay the absorbent layer, as described below. It may be applied as substantially longitudinal stripes, for example.
  • the apparatus 1 may comprise a unit to apply an adhesive to the supporting sheet 200 in a pattern, for example the pattern of the mating strips 31 , and optionally of the rods 36 , if present.
  • hotmelt adhesives used, for example, sprayable hot melt adhesives, such as H.B. Fuller Co. (St. Paul, Minn.) Product No. HL-1620-B, can be used.
  • a further immobilization adhesive may be applied to the absorbent structure produced by the apparatus 1 or method herein, e.g. to ensure the absorbent material 100 will stay substantially as applied, with the channels, preferably not only during manufacturing, but also during storage and in use (at least during part of the use).
  • This immobilization adhesive may then for example be applied onto the absorbent layer just after application of the absorbent material 100 onto the supporting sheet 200 .
  • the apparatus 1 herein may optionally have a further adhesive application unit 50 , e.g., downstream from the absorbent material deposition point.
  • the method may have a corresponding method step
  • This adhesive may be applied uniformly and/or homogeneously.
  • This may be a thermoplastic adhesive material.
  • the thermoplastic adhesive material may comprise, in its entirety, a single thermoplastic polymer or a blend of thermoplastic polymers, having a softening point, as determined by the ASTM Method D-36-95 “Ring and Ball’, in the range between 50° C. and 300° C., or alternatively the thermoplastic adhesive material may be a hot melt adhesive comprising at least one thermoplastic polymer in combination with other thermoplastic diluents such as tackifying resins, plasticizers and additives such as antioxidants.
  • the thermoplastic polymer has typically a molecular weight (Mw) of more than 10,000 and a glass transition temperature (Tg) usually below room temperature or ⁇ 6° C. ⁇ Tg ⁇ 16° C.
  • typical concentrations of the polymer in a hot melt are in the range of about 20 to about 40% by weight.
  • thermoplastic polymers may be water insensitive.
  • Exemplary polymers are (styrenic) block copolymers including A-B-A triblock structures, A-B diblock structures and (A-B)n radial block copolymer structures wherein the A blocks are non-elastomeric polymer blocks, typically comprising polystyrene, and the B blocks are unsaturated conjugated diene or (partly) hydrogenated versions of such.
  • the B block is typically isoprene, butadiene, ethylene/butylene (hydrogenated butadiene), ethylene/propylene (hydrogenated isoprene), and mixtures thereof.
  • suitable thermoplastic polymers that may be employed are metallocene polyolefins, which are ethylene polymers prepared using single-site or metallocene catalysts. Therein, at least one comonomer can be polymerized with ethylene to make a copolymer, terpolymer or higher order polymer.
  • amorphous polyolefins or amorphous polyalphaolefins which are homopolymers, copolymers or terpolymers of C2 to C8 alpha olefins.
  • the tackifying resin has typically a Mw below 5,000 and a Tg usually above room temperature, typical concentrations of the resin in a hot melt are in the range of about 30 to about 60%, and the plasticizer has a low Mw of typically less than 1,000 and a Tg below room temperature, with a typical concentration of about 0 to about 15%.
  • the thermoplastic adhesive material is present in the form of fibers.
  • the fibers will have an average thickness of about 1 to about 50 micrometers or about 1 to about 35 micrometers and an average length of about 5 mm to about 50 mm or about 5 mm to about 30 mm.
  • an adhesive bond is formed between first and second supporting sheets in at least a part of the channel area.
  • the bond strength of the adhesively connected regions may be measured by various test methods.
  • a preferred test method is the peel strength test method as described in ASTM D-903-98. In case the standard peel rate of 152 mm (6 inches)/minute results in the tearing of the fragile supporting sheet, then this rate may need to be reduced. 10 mm/minute is preferred.
  • One suitable power-driven machine for use in the test is a vertical single column Zwick Tensile Tester Test machine with 50 N force cell with force accuracy of 0.3% and distance accuracy of 0.15%.
  • the four faces of the two jaws should be padded with a thin strip of rubber to prevent slippage as provided by the supplier of the equipment (jaws: Vulkollangraphy 30 ⁇ 60 mm, material number 314366, provider: Zwick GmbH & Co, D-89079 Ulm).

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  • Absorbent Articles And Supports Therefor (AREA)
US14/615,467 2014-02-11 2015-02-06 Method and Apparatus for Making an Absorbent Structure Comprising Channels Abandoned US20150223990A1 (en)

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EP2905001B1 (de) 2017-01-04
JP2017507705A (ja) 2017-03-23
WO2015123088A1 (en) 2015-08-20
EP2905001A1 (de) 2015-08-12
US11090199B2 (en) 2021-08-17
US20190374391A1 (en) 2019-12-12

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