EP0743844A1 - Produits absorbants, et mode de preparation - Google Patents

Produits absorbants, et mode de preparation

Info

Publication number
EP0743844A1
EP0743844A1 EP95912547A EP95912547A EP0743844A1 EP 0743844 A1 EP0743844 A1 EP 0743844A1 EP 95912547 A EP95912547 A EP 95912547A EP 95912547 A EP95912547 A EP 95912547A EP 0743844 A1 EP0743844 A1 EP 0743844A1
Authority
EP
European Patent Office
Prior art keywords
article
permanent
absorbent
making
semi
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Withdrawn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
EP95912547A
Other languages
German (de)
English (en)
Inventor
James Fewtrell
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing 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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0743844A1 publication Critical patent/EP0743844A1/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Withdrawn legal-status Critical Current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
    • A61F13/53—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

  • This invention relates to absorbent materials and to their manufacture.
  • the invention relates to absorbent materials comprising a laminate of two or more layers of fibres having absorbent material between the layers of fibres.
  • the invention relates to materials suitable for use in diaper manufacture.
  • Diapers manufacturers have been looking for ways of using super absorbent polymers (SAP) in diaper products based on their performance to cost ratio and the reduction, in thickness of the products. The problem has been how to get the SAP powder/granules into a stable product so that liquid is absorbed effectively.
  • SAP super absorbent polymers
  • Laminated products comprising two webs bonded together with SAP therebetween can allow expansion if there are spaces between points of lamination but in these cases the SAP is free to migrate during processing or before getting wet giving uneven loading and reduced performance i.e. the SAP moves to places that do not get wet or it collects in lumps which are less effective at absorbing than when in thin layers due to a reduction in surface area in contact with the liquid.
  • Our co-pending British Patent Application No. 9318971.0 discloses a liquid sorbent article comprising at least one layer of sorbent fibrous material and at least one hinge about which the article may be preferentially folded, the hinge being formed by permanently bonding the fibres of the layer under pressure along a line.
  • sorbent sheet material with hinges formed by bonding fibres under pressure the strength characteristics of the article is improved and the use of the article in a variety of formats is facilitated.
  • suitable positioning of the hinges allows the article to be fan-folded for packaging and in use the article can be used in the form of a sheet, mini- pillow or boom by simple folding to increase the thickness of the article.
  • the hinges enable the sheet material to adopt and maintain a folded configuration without the need for intermittent releasable bonds.
  • the hinges are formed by welding the fibres under pressure, more preferably by pressure welding without application of heat.
  • the article is preferably constructed of at least two contiguous layers of sorbent material which are bonded together by a plurality of hinges and optionally at one or more edges. Such a two layer product has improved strength over a single layer article of the same basis weight.
  • the hinges are generally formed as a straight line extending across or along the length of the article.
  • the hinges may be continuous or discontinuous, providing the article may be preferentially folded along the line.
  • the hinge may be formed with perforations along the line to facilitate tearing the sheet into desired sizes.
  • the articles comprise a plurality of parallel hinges.
  • welds need not be formed in a straight line and may adopt other configurations, e.g., sinusoidal or zig-zag paths. Such configurations are particularly suitable for use with multilayered articles since it allows contiguous layers to be bonded in a similar manner to quilting. Furthermore, by suitable positioning of the welds it is possible to form a series of pockets between two contiguous layers which can be filled with particles, e.g., absorbents, indicators, neutralizers, etc. The pockets prevent the particles from moving freely about the material. Such particles may be dropped onto the lower web prior to application of the upper web and pressure welding.
  • the blunt slitters used for pressure welding may have working edges adopting the desired sinusoidal or zig-zag configuration and are conveniently arranged such that the re-entrant portions of adjacent welds are adjacent thereby dividing the web into substantially discrete islands.
  • EP 0146190 discloses an absorbent article comprising a layered absorbent structure having an upper surface and a lower surface, and comprising: (a) n webs of fibrous materials, n being an integer of two or more, said webs being layered such that there is an uppermost web, a lowermost web, n-2 intermediate webs, and n-1 interfaces of two opposed adjacent contacting surfaces of adjacent webs, each of the interfaces having a surface area; and (b) absorbent particles forming a discontinuous layer at one or more of the interfaces; the opposed adjacent contacting surfaces at each of the interfaces where the particles are present being substantially entirely frangibly bonded by fibre entanglement between the contacting surfaces, the particles being immobilized at the interface(s) substantially entirely by fibre entrapment.
  • the particles are immobilized but free to absorb fluid as if they were unconstrained since the bonds between the contacting webs near a swelling particle will be easily broken allowing the particle to freely swell.
  • an absorbent- article comprising two contiguous layers of fibre webs having therebetween particles of absorbent material, the layers being laminated together by a combination of permanent bonds and semi-permanent bonds which are positioned to define spaces which contain particles of the absorbent material, the semi-permanent bonds being releasable upon expansion of the absorbent material as it absorbs liquid, the permanent bonds ensuring dimensional stability of the article before and after absorption of liquid.
  • the absorbent articles of the invention provide a simple, effective arrangement for incorporation of particles of absorbent material within a laminated structure. A series of spaces or pockets is defined by the laminating bonds in which the particles are contained thereby restricting undue movement of the particles without having to immobilize individual particles.
  • a portion of the laminating bonds are semi-permanent or releasable which break or release as the particles of absorbent swell thereby allowing the particles to retain maximum absorbing capacity.
  • the invention does not require fibre entanglement to form the releasable bonds.
  • the permanent bonds are positioned at least at the sides and/or ends of the article, more preferably completely around the periphery.
  • the article may comprise other permanent bonds spaced across the layers, e.g., one or more lines of bonds.
  • the permanent bonds may conveniently be formed by welding the layers, e.g., by heat, pressure, ultrasonics or any combination thereof. The result of the welding is that the fibres are completely fused together at the bond, the identity of individual fibres not being discernible in the bond.
  • Adhesives may be used to form the permanent bonds although they are not preferred as more complex manufacturing equipment is required.
  • the semi-permanent welds prevent unwanted migration of the particles of absorbent material and are preferably arranged to form a series of pockets in a similar manner to quilting. However, other arrangements are also possible, e.g., parallel lines of semi-permanent welds will restrict particle movement providing the lines are sufficiently close.
  • the semi-permanent welds are preferably formed by cold pressure welding under conditions which are sufficient to cause fusing of the contacting surfaces of fibres thereby retaining identity of the fibres at the bond. During expansion of the SAP the pressure will be sufficient to break the bond between overlapping fibres without breakage of many of the fibres so that the article retains its structural integrity.
  • Adhesives such as those which lose adhesion on wetting may be used, although these are not preferred as they require more complex manufacturing equipment.
  • both the permanent and semi-permanent welds are formed by cold pressure welding using blunt slitters, the blunt slitters having working edges having a sinusoidal or zig-zag configuration.
  • the articles of the present invention can be formed from a wide range of sorbent sheet materials which can be laminated. Such sheet material include, for example nonwoven, fibre webs such as microfibrous sheet material, and wood pulp based webs which are well known to those skilled in the art.
  • the article generally has a basis weight of from 20 to 500g/m 2 .
  • the articles of the present invention are preferably formed from at least one layer of sorbent microfibrous sheet materials, particularly melt blown microfibrous materials.
  • sorbent microfibrous sheet materials particularly melt blown microfibrous materials.
  • Such materials are described, for example, in van Wente "Superfine Thermoplastic Fibres", Industrial Engineering Chemistry, vol. 48, pp. 1342 et seq. (1956), or in Report No. 4364, Naval Research Laboratories, May 25, 1954, "Manufacture of Superfine Organic Fibres" by van Wente, A. Boone, CD., and Fluharty, E.L.
  • the articles of the present invention are formed from at least one layer of melt blown microfibrous materials containing a surfactant topically applied or incorporated by direct addition of the surfactant to the molten polymer stream. Sorbent articles based on these __ , _,___ 95/21596
  • the articles of the invention are formed from melt
  • Polymeric materials suitable for use in preparing the microfibrous sheet or web material include, but are not limited to polyolefins such as polyethylene and polypropylene, polyesters such as poly(ethylene 0 terephthalate) and polyamides such as nylons, blends or copolymers.
  • the microfibrous sheet materials are preferably based on polyethylene, polypropylene, or blends of the two resins.
  • UV stabilizers can also be incorporated directly into the melt blown microfibrous sheet 5 materials during the melt blowing process by blending the additive with the polymer prior to extrusion.
  • Articles of the present invention which are formed from melt blown microfibrous materials typically have sufficient strength, even when saturated with liquid, that an outer facing is not required to maintain 0 integrity.
  • An optional outer facing may, however, be provided by applying a scrim material, for example, to the microfibrous sheet materials prior to lamination to improve the appearance of the article and coincidentally produce a more durable article. This can be accomplished by collecting the melt blown microfibrous web material directly on the facing or 5 alternatively bonding the facing to the microfibrous material by using an intermittent adhesive pattern or pin laminating the materials together.
  • Facing material can also be applied to the microfibrous sheet material as a coating, for example, latex, at a level which does not substantially affect the sorbency of the microfibrous sheet material.
  • Scrim materials suitable for use in the preparation of the articles of the present invention preferably have a relatively open structure, such as obtainable with nonwoven fabrics or open weave woven fabrics, so that they can be readily penetrated by both oil and aqueous based fluids. Additionally, suitable scrim materials are preferably chemically inert. Particularly preferred scrim materials include spunbond non-woven polypropylene fabrics such as 0.5 oz/yd 2 CELESTRA, available from Fiberweb North America, Inc.
  • the particles of absorbent material are preferably SAP materials, e.g., cross-linked acrylate polymers of the type commercially available from Dow under the trade designation X2 95889.01 , polyacrylamide polymers of the type commercially available from Allied Colloids under the trade mark VERSICOL W25 and sodium acrylates of the type commercially available from Atochem under the trade mark AQUAKEEP D50-65. Such materials are designed for absorption of water based fluids.
  • SAP materials may also be employed, e.g., copolymers of aromatic alkenes and dialkenes that are designed to absorb oils, acids and alkalis.
  • Other absorbent materials which may be employed include sorbent fibres, microfibres and microwebs, e.g., scrap blown microfibres from edge trims and other waste from the production of sorbent articles.
  • solid materials may also be incorporated between the layers, e.g., neutralizers for acids or bases, such as, sodium carbonate for products dealing with acid spills.
  • neutralizers for acids or bases such as, sodium carbonate for products dealing with acid spills.
  • Indicators e.g., of the litmus type, disinfectants, etc., may also be employed.
  • the articles of the invention are particularly suitable as absorbent laminates for incorporation into a diaper or other personal hygiene product to act as the absorbent core.
  • the top layer of bmf (blown microfibre) is hydrophilic and absorbs the liquid, the bottom layer is hydrophobic and prevents the passage of liquid through the article (this latter layer could be a spunbond web on a film, rather than a bmf web). Both layers encase the SAP to act as a carrier. The top layer promotes the absorption and spread of liquid over a large surface area and allows a large surface area of SAP to quickly contact the liquid.
  • the semi-permanent welds allow both expansion of the SAP without destruction of the web and also good anchoring of the SAP in places where it is needed. Therefore the SAP is used efficiently.
  • the weld lines also help promote wicking throughout the product. Therefore the absorbent does not absorb in one place but is maximized over the full surface of the product.
  • the SAP absorbs quite slowly and blown microfibre web quickly, so to pick up liquid quickly it is ideal to absorb liquid first into the blown microfibre web and then SAP begins to absorb the liquid out of the blown microfibre. This means that liquid can be quickly adsorbed by the web and also that the web tends to dry out after wetting which is a desirable feature in this type of application.
  • the product can be incorporated directly into standard wood pulp filled diaper lines without large redesign of the lines because it is strong enough to be unwound and pulled through the lines without breaking.
  • product may be supplied in long lengths, with the diaper manufacturer cutting the product to length (typically 44cm) and making the end welds.
  • hydrophobic bottom web gives soft feel, bulk and strength to the product, whilst preventing the penetration of liquid through 5 to the outside of the diaper.
  • FIG. 1 is a perspective view of an absorbent article in accordance with the invention
  • Figure 2 is a cross-section through the article of Figure 1
  • Figure 3 is a cross-section through the article of Figure 1 after absorption of liquid. 5
  • Figures 1 to 3 illustrate a sorbent article in accordance with the invention comprising two layers (2, 4) of fibre webs. At least one, preferably both layers, comprise blown microfibre web. Blown microfibre 0 web is formed by extruding fibres through a dye onto a collector. The side of the web that contacts the collector has a smooth relatively lint-free surface finish and the other side is usually more ragged. Preferably the blown microfibre webs are arranged with the rough surfaces in contact so that the outer surfaces of the article are smooth thereby providing a 5 satisfactory look and feel to the article.
  • one layer (2) is preferably a hydrophilic sorbent layer and one layer
  • the layers (2, 4) are permanently bonded to each other by permanent welds (6) positioned at the edges of the web and a permanent 0 weld (8) which is centrally positioned. These welds are conveniently formed by passing the composite layers through blunt slitter rolls such that the layers are welded together under pressure without being slit.
  • heat or ultrasonic welding may be employed or combinations of these methods.
  • the article additionally comprises a series of parallel semi- permanent welds (10) and sinusoidal semipermanent welds (12). These semi-permanent welds may be formed by cold pressure welding using blunt slitter rolls. It has been found that cold welding pressures of 200 to- 1000N/mm 2 provides good semi-permanent welds with many commercially available polyolefin non-wovens. In real terms, this is about 100 to 1000N force applied to a slitter wheel having a flattened face of from 0.5 to 2mm width. It is important that the flat face of the slitter wheel does not have sharp edges which would result in cutting of the webs.
  • the welds between the layers (2, 4) provide a series of pockets (14) which contain particulate material (16).
  • the particulate material comprises an absorbent, preferably SAP material.
  • SAP material preferably SAP material.
  • the particulate material is deposited on the lower layer (4) prior to application of the upper layer (2) before the composite is passed through the slitter rolls to form the permanent and semipermanent welds.
  • the arrangement of welds prevents the particulate material from readily moving through the article during transportation, handling and use thereby ensuring the article retains uniform properties throughout its length.
  • the pocket dimensions should be small enough to prevent unwanted movement of powder, but minimized in number so as to reduce the manufacturing difficulties and reduce the area of compressed web.
  • the pockets have length and width dimensions in the range 1.5 to 4cm.
  • it is possible to control movement of powder by using straight parallel welds to form tubes preferably having a width of 1 to 2cm.
  • Figure 3 shows a cross-section through the sorbent article after it has been saturated with liquid.
  • the absorbent (16) swells as it absorbs liquid bursting the 5 semi-permeable welds (10, 12).
  • Dimensional stability of the article is maintained by the permanent welds (6, 8).

Abstract

L'invention concerne un article absorbant constitué de deux étoffes fibreuses entre lesquelles se trouvent des particules absorbantes. Les deux étoffes sont doublées grâce à une combinaison de liens permanents et semi-permanents. Les liens semi-permanents définissent les espaces contenant les particules absorbantes. Lors de l'absorption de liquide, les liens semi-permanents se relâchent à mesure que les particules absorbantes se dilatent. Ainsi est assurée la stabilité dimensionnelle du produit après absorption du liquide.
EP95912547A 1994-02-11 1995-02-07 Produits absorbants, et mode de preparation Withdrawn EP0743844A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9402706 1994-02-11
GB9402706A GB9402706D0 (en) 1994-02-11 1994-02-11 Absorbent materials and preparation thereof
PCT/US1995/001567 WO1995021596A1 (fr) 1994-02-11 1995-02-07 Produits absorbants, et mode de preparation

Publications (1)

Publication Number Publication Date
EP0743844A1 true EP0743844A1 (fr) 1996-11-27

Family

ID=10750280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95912547A Withdrawn EP0743844A1 (fr) 1994-02-11 1995-02-07 Produits absorbants, et mode de preparation

Country Status (4)

Country Link
EP (1) EP0743844A1 (fr)
AU (1) AU1965795A (fr)
GB (1) GB9402706D0 (fr)
WO (1) WO1995021596A1 (fr)

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JP6219437B2 (ja) * 2016-03-30 2017-10-25 大王製紙株式会社 吸収性物品
EP3238678B1 (fr) 2016-04-29 2019-02-27 The Procter and Gamble Company Noyau absorbant avec des lignes de pliage transversales
EP3238676B1 (fr) 2016-04-29 2019-01-02 The Procter and Gamble Company Noyau absorbant avec profil de distribution de matériau absorbant

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GB9402706D0 (en) 1994-04-06
AU1965795A (en) 1995-08-29
WO1995021596A1 (fr) 1995-08-17

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