US20110092946A1 - Wearable Article with Extensible Fastening Member Having Stress Distribution Features and/or Fastening Combination Performance Characteristics, and Method of Testing and Selecting Fastening Combination Performance Characteristics - Google Patents

Wearable Article with Extensible Fastening Member Having Stress Distribution Features and/or Fastening Combination Performance Characteristics, and Method of Testing and Selecting Fastening Combination Performance Characteristics Download PDF

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US20110092946A1
US20110092946A1 US12/904,212 US90421210A US2011092946A1 US 20110092946 A1 US20110092946 A1 US 20110092946A1 US 90421210 A US90421210 A US 90421210A US 2011092946 A1 US2011092946 A1 US 2011092946A1
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United States
Prior art keywords
fastener
fastening member
fastening
zone
waist region
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Abandoned
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US12/904,212
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English (en)
Inventor
Mark James Kline
Oliver Edwin Clarke Mason
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Procter and Gamble Co
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Procter and Gamble Co
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43416718&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20110092946(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to US12/904,212 priority Critical patent/US20110092946A1/en
Assigned to PROCTER & GAMBLE COMPANY, THE reassignment PROCTER & GAMBLE COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MASON, OLIVER EDWIN CLARKE, KLINE, MARK JAMES
Publication of US20110092946A1 publication Critical patent/US20110092946A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
    • 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
    • A61F13/49007—Form-fitting, self-adjusting disposable diapers
    • A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49014—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels
    • A61F13/49015—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the side panels the elastic means being elastic panels
    • 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
    • A61F13/56—Supporting or fastening means
    • A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
    • 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
    • A61F13/56—Supporting or fastening means
    • A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
    • A61F13/622—Fabric strip fastener elements, e.g. hook and loop
    • A61F13/627—Fabric strip fastener elements, e.g. hook and loop characterised by the loop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0091—Peeling or tearing

Definitions

  • Some wearable articles are manufactured to include fastening members.
  • some varieties of diapers are manufactured with a pair of oppositely-oriented side fastening members, extending laterally from each side of a first waist region of the chassis, each fastening member having a fastener located at or near the outboard end thereof, and adapted to attach or adhere to a fastener receiving zone (“landing zone”) disposed on a second waist region of the chassis.
  • the fastening members may be formed in part or in whole of a nonwoven web material.
  • the fastening members are formed at least in part of a laminate of one or more layers of nonwoven web material and one or more layers or strands of a polymeric elastic material, and fashioned and adapted in such a way as to be elastically extensible in at least the direction in which the fastening member is to be pulled during application and use.
  • One type has fastening members extending from the rear waist region of the diaper, and is intended to enable the person applying the diaper (hereinafter, “applier”) to lay the diaper open on a surface, with the rear region of the diaper beneath a reclining wearer's bottom, wrap the chassis forward between the wearer's legs and up over the front of the lower torso, draw each fastening member from the rear waist region around a hip, and attach the end of each fastening member to the front region via the fastener, thereby forming a waistband and pant-like structure about the wearer.
  • each fastening member may be in direct contact with the wearer's skin at a hip.
  • the fastening members be formed so as to cover substantial areas of skin at the wearer's hips. This may have two purposes, among others: First, comfort, resulting from distribution of normal force components of tension forces in the fastening members over greater, rather than lesser, areas of skin; and second, appearance.
  • fastening members may be desirable to form fastening members from material that is relatively soft to the touch, pliable and stretchy. Purposes for this may include comfort.
  • Fastening members may be subject to varying forces, resulting from tugging during application, and from the wearer's movements at the hips, particularly if the diaper is snugly applied. These forces may have various undesirable effects.
  • a typical fastening member e.g., one that extends from the rear waist region of a diaper, is longer at its inboard end than at its outboard end. This general geometry may be incorporated to allow for, e.g., better fit about the wearer's hips, and better distribution of lateral tension forces along a greater length along the location(s) where the fastening member joins the rear waist region, thereby reducing the likelihood of tearing along that line or locations proximate the inboard end of the fastening member.
  • a relatively shorter outboard end typically having a fastener attached proximate thereto, allows for tugging by the applier by simply grasping between thumb and forefinger, and for easy selection and placement of a point or region of fastening, by simply placing the grasped, shortened outboard end at the desired location.
  • This general geometry results in lateral tension forces being focused from a longer inboard region to a shorter outboard end region of the fastening member. This focusing, together with stretching, creates longitudinal force components within the fastening member.
  • Longitudinal force components acting within the fastening member may create the likelihood that portions of the fastening member such as a panel region and/or extensible zone thereof will undesirably laterally buckle and/or flip away from the wearer.
  • panel regions of fastening members may be formed so as to have the greatest length (in a longitudinal direction along the chassis) feasible under the circumstances. Increasing length adds to the area of the material forming the panel region. With increasing length and surface area of the panel region, undesirable buckling/flipping of the panel region material proximate either the top or bottom edges may be more likely, particularly when the wearer bends at the hips.
  • buckling/flipping of the panel region proximate its edges may be less likely because longitudinal force components resulting from lateral tension in the fastening member may be distributed into the end region.
  • longitudinal force components may act at or about the lateral edges of the fastener and contribute to causing the fastener to bend or “dish”, i.e., contribute to causing its lateral edges to be urged to turn up and away from the surface to which it is attached.
  • one type of diaper fastening member may include a fastener consisting of a patch of hooks, a component of a hook-and-loop fastening system (such as a 3M, APLIX or VELCRO hook-and-loop system).
  • a patch of a corresponding loops component may be disposed at a landing zone on the outside front waist region of the diaper, so as to enable attachment when the hooks patch is pressed against the landing zone.
  • Another example may have a fastener consisting of a patch of material bearing an adhesive effective to adhere to a smooth surface disposed at the landing zone.
  • longitudinal force components of tension forces in the fastening member, acting at the edges of the fastener patch can urge its longitudinally outer edges up and away from the landing zone, thereby causing a sub-optimal fastener attachment to the landing zone, or weakening the fastener's hold at the landing zone, or even causing the fastener's hold to fail—which may allow the diaper to come loose or fall free of the wearer.
  • stresses in the fastening member resulting from lateral tension may concentrate in the end region near or at the inboard edges of the fastener zone.
  • stresses in the fastening member resulting from lateral tension may concentrate in the end region near or at the inboard edges of the fastener zone.
  • stresses in the fastening member may concentrate at locations where the fastening member narrows to an end region, particularly if there is an abrupt structural discontinuity, such as created by the presence of, for example, the edge of a patch of a relatively stiffer material adhered to a substrate material. Tearing may occur in the end region, at or near the fastener zone, when the applier tugs on the fastening member to apply the diaper; or the end region may tear at or near the fastener zone from stresses resulting from the wearer's movements.
  • a material that is more robust, and therefore, stiffer and more resistive to buckling and tearing, may be used to form the panel region and/or extensible zone.
  • Robustness of a material such as a stretch laminate can be increased, for example, by the use of materials having greater basis weights and/or densities.
  • increasing the bending stiffness of a fastener patch by selection of a thicker and/or denser patch material may make it more resistive to dishing.
  • FIG. 1 is a simplified depiction of a wearable article in the form of a diaper, shown extended and laid flat, viewed from above, wearer-facing surface up;
  • FIG. 2 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 3 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 4 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 5 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 6 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 7 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 8 is a depiction of an example of a fastening member, laid flat and viewed from above;
  • FIG. 9 is a depiction of a simplified schematic, exploded lateral cross section through an example of a fastening member, taken along a stretch direction;
  • FIG. 10A is a reproduction of a CAD drawing depicting an example of a fastening member, laid flat and viewed from above;
  • FIG. 10B is a reproduction of a CAD drawing depicting an example of a fastening member, laid flat and viewed from above;
  • FIG. 10C is a depiction of a simplified schematic, exploded lateral cross section through the example of the fastening member depicted in FIG. 10A ;
  • FIG. 11 is an elevation view showing an apparatus for testing the bending stiffness of materials
  • FIG. 12 is a front elevation view showing a plunger for use with the apparatus of FIG. 11 ;
  • FIG. 13 is a side elevation view showing a plunger for use with the apparatus of FIG. 11 ;
  • FIG. 14 is a graph showing Peak bending load and slope calculation areas on bending curve
  • FIG. 15A is a simplified depiction of a wearable article in the form of a diaper, shown extended and laid flat, viewed from above, wearer-facing surface up;
  • FIG. 15B is a simplified depiction of a wearable article in the form of a diaper, shown extended and laid flat, viewed from above, wearer-facing surface down;
  • FIG. 15C is a depiction of a sample of landing zone material removed from a wearable article such as depicted in FIGS. 15A and 15B ;
  • FIG. 16A is a schematic front-view depiction of upper and lower fixtures used in the Vertical Pull Test described herein;
  • FIG. 16B is schematic perspective-view depiction of the lower fixture used in the Vertical Pull Test described herein, shown with test samples oriented with respect thereto;
  • FIG. 16C is a view of cross-section C-C taken through the schematic depiction of the lower fixture shown in FIG. 16A .
  • an extensible material refers to the property of a material, wherein: when a biasing force is applied to the material, the material can be extended to an elongated length of at least 110% of its original relaxed length (i.e. can extend 10%), without a rupture or breakage that renders the material unusable for its intended purpose. A material that does not meet this definition is considered inextensible.
  • an extensible material may be able to be extended to an elongated length of 125% or more of its original relaxed length without rupture or breakage that renders the material unusable for its intended purpose.
  • An extensible material may or may not exhibit recovery after application of a biasing force.
  • an extensible material is considered to be “elastically extensible” if, when a biasing force is applied to the material, the material can be extended to an elongated length of at least 110% of its original relaxed length (i.e. can extend 10%), without rupture or breakage which renders the material unusable for its intended purpose, and when the force is removed from the material, the material recovers at least 40% of its elongation. In various examples, when the force is removed from an elastically extensible material, the material may recover at least 60% or at least 80% of its elongation.
  • “Inboard”, and forms thereof, with respect to features of a fastening member, means furthest from or in a direction away from the free distal end.
  • An “inboard- and longitudinally inward-pointing vertex”, with respect to a feature of a lateral edge of a wearable article fastening member, laid flat and horizontally, viewed from above, is one in which a line equally dividing the angle formed by the vertex, together with the portions of the lines forming the vertex, form an arrow that points at least partially longitudinally inwardly on the fastening member and away from a lateral line perpendicular to the wearable article longitudinal axis and intersecting the longitudinally outermost point along the lateral edge, and at least partially in a laterally inboard direction.
  • inboard direction is indicated by arrow 3 (perpendicular to longitudinal axis 24 ); longitudinally inward directions are indicated by arrows 4 (parallel to longitudinal axis 24 , and pointing away from lateral lines 6 ); and examples of inboard and longitudinally inward directions are indicated by arrows 5 , formed at depicted examples of identifiable inboard- and longitudinally inward-pointing vertices 7 .
  • “Junction line,” with respect to a fastening member comprising components that are discrete from other components of a wearable article, which fastening member is welded, bonded, adhered or otherwise attached to the wearable article, means a longitudinal line, parallel with a longitudinal axis of the wearable article, across the fastening member through the inboard-most point at which the fastening member or a portion thereof is extensible in response to a lateral tension force imposed thereon.
  • an extensible zone might have an irregular shape or orientation, or consist of a plurality of extensible portions; in such examples, the point at which such shape, orientation or extensible portions are closest to a longitudinal axis of a wearable article will mark the location of the junction line.
  • “Junction line,” with respect to a fastening member comprising one or more components that are not discrete from, but rather, integral with, one or more components of a diaper chassis that is disposed in an opened, extended position and laid flat and horizontally, viewed from above, means either—(a) a longitudinal line along the fastening member and integral chassis component, parallel to the wearable article longitudinal axis, and aligned with the longitudinal edge of the chassis at its narrowest point, on the side from which the fastening member extends, or (b) a longitudinal line across the fastening member through the inboard-most point at which the fastening member or a portion thereof is extensible—whichever longitudinal line is most outboard along the fastening member, subject to the Note immediately above.
  • “Lateral” and “width” (and forms thereof), with respect to features of a wearable article fastening member relates to a direction, or generally following a direction, partially or entirely perpendicular to a longitudinal axis along the wearable article.
  • “Lateral” and “width” (and forms thereof), with respect to features of a diaper chassis relates to a direction substantially parallel to the lateral axis of the chassis.
  • “Lateral axis” with respect to a wearable article adapted to be worn by a wearer means an axis perpendicular to the longitudinal axis, and equally dividing the longitudinal length of the article.
  • “Longitudinal” and “length” (and forms thereof), with respect to features of a fastening member relates to a direction, or generally following a direction approximately aligned with the wearer's spine when the article would be normally worn, with the wearer in a standing or extended reclining position.
  • “Longitudinal” and “length” (and forms thereof), with respect to features of a diaper chassis, relates to a direction approximately aligned with the wearer's spine when the article would be normally worn, with the wearer in a standing or extended reclining position.
  • “Longitudinal axis” with respect to a wearable article adapted to be worn by a wearer means an axis approximately aligned with the wearer's spine when the article would be normally worn, with the wearer in a standing or extended reclining position, and equally dividing the lateral width of the article, the lateral width being measured along a direction generally, parallel to the lateral axis.
  • “Longitudinal axis” with respect to a diaper chassis having a pair of opposing lateral waist edges and a pair of opposing longitudinal edges, the diaper chassis being opened and laid flat and horizontally, viewed from above, means a line connecting the waist edges and equidistant from the longitudinal edges, thus equally dividing the lateral width of the chassis, as illustrated by way of example in FIG. 1 (at reference numeral 24 ).
  • “Longitudinally inner”, and forms thereof, with respect to a fastening member laid flat and horizontally, viewed from above, means at or toward its longitudinal middle, between its lateral edges.
  • “Longitudinally outer”, and forms thereof, with respect to a fastening member laid flat and horizontally, viewed from above, means at or toward one of its lateral edges, and away from its longitudinal middle.
  • Nonwoven or nonwoven material means a fabric-like web material formed of fibers of a material (such as a polymeric material) which are neither woven nor knitted.
  • Normal when used in conjunction with the terms “direction”, “force” and/or “stress” in a web material, refers to a direction approximately orthogonal to the macroscopic surface of the web material when laid flat, or approximately orthogonal to a plane that is tangential to the macroscopic planar surface of the web material when the macroscopic surface of the web material is curved.
  • Outboard and forms thereof, with respect to features of a fastening member, means at or in a direction toward its free distal end.
  • overlap when used to describe a disposition of two or more discrete layers forming a fastening member, means that one layer lies, at least partially, vertically over or beneath the other(s) when the member is laid flat in horizontal position, as viewed from above. Unless otherwise specified, “overlap” is not intended to imply or be limited to meaning that the layers are in direct contact with each other, without any intermediate layers or other materials or structures between them.
  • “Stretch laminate” means an extensible and elastic web material comprising a combination of an elastic polymeric material layered, laminated or interspersed with a nonwoven material.
  • FIG. 1 generally depicts a simplified representation an example of a wearable article, in the form of a diaper 1 , as it might appear in an opened, extended position, laid flat and horizontally, body-facing surface up, and viewed from above.
  • Diaper 1 may have a chassis 10 , longitudinal edges 23 , longitudinal axis 24 , lateral axis 25 , front waist region 11 , front waist edge 12 , rear waist region 13 , and rear waist edge 14 , and an absorbent core (not shown) disposed between layers of the chassis 10 .
  • Chassis 10 may have a pair of oppositely-oriented fastening members 50 a , 50 b extending laterally from a waist region 11 or 13 .
  • a fastening member 50 a may be a discrete component affixed to a portion of chassis 10 along a line as suggested on the left side of FIG. 1 .
  • a fastening member 50 b may be a component that is not discrete from the chassis 10 , but rather, may be integral with a chassis component such as a backsheet, forming an extension thereof, such as suggested on the right side of FIG. 1 .
  • Each of fastening members 50 a , 50 b may have a respective fastener zone 71 that includes a fastener 70 disposed at or near its outboard end.
  • a fastener 70 may be a patch of hook material constituting the hook components of a hook-and-loop fastening system (such as a 3M, APLIX or VELCRO hook-and-loop system).
  • the garment-facing surface of front waist region 11 may have a laterally extended landing zone 22 bearing a patch or strip of loop material constituting the cooperating loop component of the hook-and-loop fastening system.
  • a fastener 70 may be a patch of adhesive-bearing material, and landing zone 22 may bear a patch of adhesive-receiving material having smooth surface features and/or chemistry effective to provide an adhesive bond upon contact with a fastener 70 .
  • fasteners include but are not limited to fastening elements described in co-pending U.S. application Ser. No. 11/895,169.
  • Other examples may include any other cooperating engaging and receiving surfaces or components adapted to effect fastening, respective components of which may be disposed on either fastening zone 71 or landing zone 22 , or another location of the wearable article as desired.
  • a fastener 70 also may include groups of separately identifiable fastening elements such as a plurality of discrete patches of adhesive-bearing material, discrete patches of hooks, etc.
  • the lateral extent of a landing zone 22 across front waist region 11 as suggested in FIG. 1 provides for attachment of fasteners 70 at laterally varying locations along the front waist region 11 , and thereby, adjustability of the waist opening size and snugness of the diaper as it is being applied to a wearer.
  • FIG. 3 depicts an example of a fastening member 50 a shown apart from a wearable article.
  • the fastening member 50 a has a first longitudinally outermost lateral edge 68 , a second longitudinally outermost lateral edge 69 , and an outboard end 54 .
  • an extensible zone 66 which may comprise a laminate that is extensible along a stretch direction 67 .
  • extensible zone 66 may comprise a web or laminate web that is elastically extensible. Extensible zone 66 may extend between inboard and outboard extensible zone extents 86 , 87 . Outboard extensible zone extent 87 is a line drawn longitudinally through the outboard-most extent of the location(s) of extensible zone 66 .
  • an extensible zone might have an irregular shape or orientation, or consist of a plurality of extensible portions; in such examples, the point at which such shape, orientation or extensible portions are farthest from a longitudinal axis of a wearable article will mark the location of the outboard extensible zone extent 87 .
  • extensible zone extents 86 , 87 may fall along inboard and outboard lines at which a region of mechanical activation is bounded. For all purposes herein, inboard extensible zone extent 86 is coincident with junction line 51 .
  • Fastening member 50 a may be attached to a wearable article in any suitable manner, including, but not limited to, continuous or intermittent adhesive bonding, compression bonding, heat bonding, ultrasonic bonding, etc.
  • Fastening zone 71 is bounded by fastening zone inboard extent 88 and fastening zone outboard extent 75 ; extents 88 and 75 are longitudinal lines, parallel with the longitudinal axis of the wearable article, along the inboard-most and outboard-most locations at which a fastener is located.
  • Inboard fastener zone corners 72 and 73 are respective points on lateral edges 68 , 69 intersected by fastener zone inboard extent 88 .
  • a fastener might have an irregular shape or orientation, or consist of a plurality of discrete fastening elements; in such examples, the points at which such shape, orientation or elements are closest to and farthest from a longitudinal axis of a wearable article will mark the locations of the fastening zone inboard and outboard extents 88 and 75 , respectively.
  • a junction line 51 on the fastening member can be identified as defined above, and intersects first and second outermost lateral edges 68 , 69 at first and second longitudinally outermost junction points 52 , 53 .
  • First and second line segments 76 , 78 , connecting first and second junction points 52 , 53 and first and second inboard fastener zone corners 72 , 73 , respectively, can be identified.
  • An end region 55 may project in an outboard direction from outboard extensible zone extent 87 , and include an intermediate region 57 .
  • End region 55 may have a fastener 70 disposed at or near the outboard end 54 thereof.
  • One or more layers of material forming end region 55 may be partially or entirely integral and continuous with layer(s) of material forming panel region 56 , or end region 55 may be formed of differing or supplemental materials attached to panel region 56 .
  • fastening members of a diaper may be designed and situated to Wrap around a wearer's hips. As a result, they may be in contact with the skin at the wearer's hips while the diaper is being worn. Additionally, while a diaper is being worn the fastening members will sustain and transfer varying tension forces, particularly when the wearer is active and bending at the hips. These tension forces have normal force components acting on the wearer's skin. Thus, it may be desirable that the material forming the skin-contacting portions of a fastening member 50 a be selected with the objectives of maximizing extensibility, pliability and surface area. Increasing these variables generally may help to more evenly distribute normal forces over a greater skin surface area, provide for easier accommodation of movement, and reduce the likelihood of skin marking and chafing.
  • the extensible zone of fastening member 50 a be formed of a material, for example, a stretch laminate, having a relatively high extensibility.
  • stretch laminates that may be suitable for forming an extensible zone are described in PCT Applications No. WO 2005/110731 and Published U.S. Application Nos. US 2004/0181200 and US 2004/0193133.
  • Increasing extensibility also may enable conservation of material, in that comparatively less of a comparatively more extensible material, is required to provide a desired stretched width to the fastening member. It may be desirable, therefore, that the overall extensibility of a fastening member, expressed in terms of the ratio of the amount of extension in width over unstretched width, in response to a given lateral force load, be at least about a particular amount.
  • a reference width WS can be identified, as the width of the fastening member from inboard extensible zone extent 86 to fastener zone inboard edge 88 . It may be desirable for the fastening member to be extensible under a laterally-applied tension load of 8.0 N to at least about 40%, or at least about 50%, or even at least about 60%, where the percentage is calculated as [(amount of extension of width WS at 8.0 N lateral tension load)/(unstretched width WS at zero lateral load)] ⁇ 100%. For purposes herein, this expression of extensibility is referred to as “overall extensibility under load”.
  • the desirable amount of extensibility may, however, also vary in relation to the length of the fastener zone 71 and/or the length of the extensible zone 66 .
  • the length of the fastener zone inboard edge is shown as LFP
  • the length of the inboard extensible zone extent 86 is shown as LEP.
  • the fastening member be extensible under a laterally-applied tension load of 2.1 N/cm-LFP (2.1 N per each cm fastener inboard edge length LFP) to at least about 45%, or at least about 55%, or even at least about 65%, where the percentage is calculated as [(amount of extension of width WS at 2.1 N/cm-LFP lateral tension load)/(unstretched width WS at zero load)] ⁇ 100%.
  • this expression of extensibility is referred to as “extensibility under load per fastener zone length”.
  • the fastening member be extensible under a laterally-applied tension load of 1.0 N/cm-LEP (1.0 N per each cm extensible zone inboard edge length LEP) to at least about 45%, or at least about 55%, or even at least about 65%, where the percentage is calculated as [(amount of extension of width WS at 1.0 N/cm-LEP lateral tension load)/(unstretched width WS at zero load)] ⁇ 100%.
  • this expression of extensibility is referred to as “extensibility under load per extensible zone length”.
  • a “highly extensible fastening member” is any fastening member having an extensibility value approximately equal to or exceeding any of the lowest overall extensibility under load, extensibility under load per fastener zone length, or extensibility under load per extensible zone length, described above.
  • a fastening member 50 a be maximized in length L (the length of junction line 51 ) and surface area, to the extent feasible, for three reasons: first, to distribute the normal forces acting against the skin over a greater skin area, for greater comfort and less likelihood of skin marking and chafing; second, to distribute tension forces along a longer portion of the chassis in the waist region, thus minimizing the likelihood of tearing at the chassis; and third, to maximize skin coverage at the hips, for purposes of appearance of the diaper.
  • extensibility, pliability and fastening member length/surface area are several (among a number of) variables which may be adjusted to affect comfort and performance. Adjustment of these variables, however, may have undesirable effects. For example, increasing length L and surface area of the fastening member 50 a , increases the likelihood that top or bottom edges of the panel region 56 may buckle and flip away from the wearer while the diaper is being worn, detracting from the appearance of the diaper and compromising some of the benefits of the increased length and surface area. Referring to FIG.
  • first and second line segments 76 , 78 approximately show longitudinally outermost lines of tension in the fastening member between first and second longitudinally outermost junction points 52 , 53 and first and second inboard fastener zone corners 72 , 73 , that would exist absent shape features of fastening element 50 a discussed in more detail below. Without intending to be bound by theory, it is believed that, as stress is distributed through an extensible web material when it is stretched under lateral load as in the configuration shown in FIG.
  • material proximate to line segments 76 , 78 may be subject to varying levels of longitudinally inwardly-directed, transmitted longitudinal force components, which may tend to pull material outside line segments 76 , 78 longitudinally inwardly. In designs not having features herein described, this may cause the material forming the panel region 56 and/or the extensible zone 66 to buckle and even flip away from the wearer, approximately along the longitudinally outermost lines of tension. As a result of such buckling and/or flipping, normal forces in the fastening member acting on the skin may be distributed over less skin area, and appearance of the diaper may be compromised. Increasing the pliability of the fastening member material may lessen its ability to resist such buckling/flipping, and may thereby exacerbate the problem.
  • fastening member 50 a may increase a tendency to cause longitudinally inward-directed longitudinal force components to be distributed through the fastening member so as to act in concentrated areas along the longitudinally outer edges of the fastener zone 71 .
  • This effect coupled with movements by the wearer that may urge the fastener zone 71 to flex such that its longitudinally outer edges move away from the wearer, may cause the longitudinal forces to be directed so as to further urge the edges of fastener zone 71 away from the wearer.
  • the edges of the fastener zone 71 may be urged away (dish) from the landing zone to which fastener 70 is attached, which in turn, may cause the hold of the fastener 70 to the landing zone to be weakened, or even to fail.
  • the problems identified above may be mitigated by the use of materials having a higher planar bending stiffness for, e.g., the panel region 56 , extensible zone 66 , end region 55 , fastener zone 71 , and areas between/around them. As these areas are stiffened, the likelihood of undesired buckling of the extensible zone, and lifting of edges of the fastener zone, is decreased. This approach, however, may have undesirable effects. Stiffening the panel region 56 and/or extensible zone 66 may necessarily require using materials that are thicker and/or more dense, and add material cost. Stiffer material in panel region 56 and/or extensible zone 66 may undesirably feel less soft, supple and cloth-like to the applier and the wearer.
  • a reduction in extensibility in a fastening member means that, unless snugness and comfort of the article are to be compromised, features imparting lateral extensibility about the waist must be incorporated into other components of the diaper, for example, the waist regions 11 , 13 of the chassis 10 .
  • Excessively increasing stiffness in the fastener zone 71 may create the feel of an unyielding object against the diaper at the wearer's abdomen, and may be a source of discomfort for the wearer, particularly when the wearer is sitting and/or bending forward at the hips.
  • Increasing stiffness in the fastener zone also may necessitate increasing material thickness and/or density, adding cost.
  • FIGS. 3 and 4 depict examples of a fastening member, 50 a and 50 b . Potentially advantageous features in these examples will now be described.
  • FIG. 3 depicts a fastening member 50 a comprising discrete components as may be attached to a wearable article
  • FIG. 4 depicts a fastening member 50 b comprising components integral with components of a wearable article.
  • a fastening member may be integrally-formed. “Integrally-formed,” for purposes herein and with respect to a fastening member having a fastener attached thereto, means a fastening member that has one or both of the following characteristics: (1) It has no inboard- and longitudinally inward-pointing vertex lying along its first or second outermost lateral edges, and lying between the inboard edge of the fastener zone and a junction line; and/or (2) there is at least one longitudinal line along the end region, along which a layer of material forming the end region is longitudinally coextensive with, or longer than, a layer of material forming an extensible zone.
  • fastening member having one or both of them structurally and functionally distinguish a fastening member having one or both of them from a fastening member having a “tape” type construction, in which a comparatively short tab member, bearing a fastener and forming the end region of the fastening member, joins a relatively longer side panel region of the fastening member, in which such vertices are present and no such line exists.
  • an integrally-formed fastening member is substantially less prone to buckling/flipping in the panel region and/or extensible zone as described above, as compared with possible constructions not having these characteristics.
  • a layer of material in whole or in part forming end region 55 such as first surface layer 62 or second surface layer 63 may also form a part of panel region 56 and extensible zone 66 . It can be appreciated that there may be at least one line (in the example depicted, there are more than one), along which an end region layer of material (such as first surface layer 62 , second surface layer 63 and/or reinforcing layer 61 ) may be longitudinally coextensive with, or longer than, a layer of material forming the extensible zone 66 .
  • an end region layer of material such as first surface layer 62 , second surface layer 63 and/or reinforcing layer 61
  • outermost lateral edges 68 , 69 can be shaped so as to have no inboard- and longitudinally inward-pointing vertices lying therealong, between the inboard edge 88 of the fastener zone 71 and a junction line 51 .
  • end region 55 is formed of materials or components that are discrete from materials forming panel region 56 , which are affixed to an outboard portion of panel region 56 , when end region 55 is appropriately shaped there still may be at least one line along which an end region layer of material may be longitudinally coextensive with, or longer than, a layer of material forming the extensible zone 66 , and/or, one or both of outermost lateral edges 68 , 69 can be shaped so as to have no inboard- and longitudinally inward-pointing vertices lying therealong, between the inboard edge 88 of the fastener zone 71 and a junction line 51 , thus forming an integrally-formed fastening member.
  • integrally-formed fastening member may be less prone to panel region buckling and flipping, the construction may cause transfer of longitudinal forces outboard along the fastening member, toward and into the end region. Unless these forces are managed by other features, integrally-formed construction may, in some circumstances, lead to increased likelihood of fastener zone dishing.
  • FIGS. 3 and 4 Additional possible advantageous features of a fastening member outer shape may be identified in FIGS. 3 and 4 . It can be seen that one or both of the first and second longitudinally outermost lateral edges 68 , 69 may be given a profile that traverses line segments 76 , 78 .
  • This feature may provide certain advantages. Without intending to be bound by theory, it is believed that it serves to direct lines of tension, and longitudinal force components thereof, away from the lateral edges and toward the longitudinal middle of the fastening member, thus further reducing the likelihood of buckling/flipping in the panel region and/or extensible zone. It also is believed such direction of longitudinal force components toward the longitudinal middle decreases the leverage such longitudinal force components may otherwise exert at the lateral outer edges of fastener zone 71 that tend to urge it dish.
  • fastening member 50 a may have junction line 51 , outboard end 54 , fastener zone 71 , fastener 70 , and extensible zone 66 .
  • Extensible zone 66 may be bounded by an inboard extensible zone extent 86 and an outboard extensible zone extent 87 .
  • Extensible zone 66 may be elastically extensible between extents 86 , 87 along lateral stretch direction 67 .
  • Extents 86 and 87 may be, in one example, lines along which activation of a stretch laminate forming fastening member 50 a begin and end, such that fastening member 67 is substantially elastically extensible in extensible zone 66 , but not substantially elastically extensible in the areas inboard and outboard of extents 86 and 87 , respectively.
  • an acting width WA in an example such as depicted in FIG. 5 may be identified as the width of fastening member 50 a from the fastener zone outboard edge 75 , lying along longitudinal line W 0 , to inboard extensible zone extent line 86 , lying along longitudinal line W 100 .
  • Width WA may be divided into four equal portions, by longitudinal line W 25 lying at 25% of acting width WA; longitudinal line W 50 lying at 50% of acting width WA, and longitudinal line W 75 lying at 75% of acting width WA, and bounded by lines W 0 and W 100 .
  • Fastening member 50 a may have varying lengths L 0 , L 25 , L 50 , L 75 and L 100 measurable along lines W 0 , W 25 , W 50 , W 75 and W 100 , respectively, where they intersect with first and second longitudinally outermost lateral edges 68 , 69 , as shown by way of example in FIG. 5 .
  • results may be achieved, that is, a combination of—(a) effectively controlled dishing of the fastener along with (b) a fastener that is large enough in contact surface area to provide effective fastening/holding capability; (c) effectively controlled buckling and foldover of the material forming the fastening member and (d) satisfactory skin coverage—may be achieved, when L 0 , L 25 and L 50 fall approximately above the following lower limits, expressed as a percentage of L 100 . Further, in some examples, results may be improved if L 0 , L 25 and L 50 fall approximately below the following upper limits, expressed as a percentage of L 100 :
  • Outermost lateral edges 68 , 69 each may have profiles defining one or more inflection points 94 , at which the direction of curvature of the profile changes. Without intending to be bound by theory, it is believed that including at least one such inflection point 94 on at least one of outermost lateral edges 68 , 69 approximately between lines W 25 and W 50 is effective for diffusing longitudinal force components away from such edge, so as to reduce the likelihood of dishing of a fastener zone. Inclusion of several inflection points 94 may increase the effect.
  • inflection points 94 may be included approximately between lines W 25 and W 50 on each of outermost lateral edges 68 , 69 . Inflection points may also be included on one or both of outermost lateral edges 68 , 69 approximately between lines W 50 and W 75 . Additional inflection points 94 may be added, as shown by way of example in FIG. 5 along first outermost lateral edge 68 , suggesting two inflection points 94 approximately between lines W 25 and W 50 , and two inflection points 94 approximately between lines W 50 and W 75 .
  • FIGS. 3-6 Additional features are apparent from FIGS. 3-6 , and may be helpful to reduce the likelihood of panel region buckling/flipping and/or fastener zone dishing.
  • L 0 which corresponds to the length of the outboard edge 75 of fastener zone 71
  • LFP which corresponds to the length of the inboard edge 88 of fastener zone 71
  • Outboard fastener zone corners 92 and 93 are respective points on lateral edges 68 , 69 intersected by fastener zone outboard extent 75 .
  • first and second fastener zone lateral edge lines 90 , 91 may be identified, which connect first inboard fastener zone corner 72 with first outboard fastener zone corner 92 , and second inboard fastener zone corner 73 with second outboard fastener zone corner 93 , respectively.
  • angles ⁇ and ⁇ are formed by the intersection of lateral edge lines 90 , 91 and lateral lines 110 , 111 that are perpendicular to junction line 51 as shown.
  • these angles ⁇ and ⁇ are referred to as “fastener zone lateral edge angles.”
  • shaping the fastening member such that these fastener zone lateral edge angles ⁇ and ⁇ lie between about 0 degrees and about 30 degrees, or between about 2 degrees to about 20 degrees, or between about 2 degrees to about 15 degrees, or even between about 5 degrees and 15 degrees, extending outwardly from the lateral lines 110 and 111 , substantially helps reduce the likelihood of fastener zone dishing as a result of the effects of distributing force components within the fastening member, across the fastener zone.
  • Angles ⁇ and ⁇ need not be the same. They may be the same, or they may be different. One or both may fall within one or more of the ranges set forth above.
  • fastener 70 for purposes of best positioning of a fastener relative to the location at which an applier is likely to grasp the fastening member, it may be desirable to locate fastener 70 such that it lies entirely outboard of line W 25 .
  • the unstretched extensible zone width may be desirable for the unstretched extensible zone width to exceed about 75 percent of the acting width WA.
  • the extensible zone 66 may have a width from about 50 percent to about 75 percent of the acting width of the fastening member. It also may be desirable that outboard extensible zone extent 87 be located between W 25 and W 50 .
  • an integrally-formed fastening member may in some circumstances promote transfer of longitudinal force components to the edges of the fastener zone. This may urge the fastener to dish, and, as a result, pop off (suddenly and entirely disengage from) its associated landing zone when in use. For this reason, utilizing a combination of fastener and landing zone material (“fastening combination”) that exhibits a good resistance to pop-off may be desired.
  • a test denominated herein the Vertical Pull Test has been devised as a relative indicator of the performance of a fastening combination in use.
  • the Vertical Pull Test measures the force and work, over separation distance, necessary to separate engaged flat samples of fastener and landing zone material, in a direction orthogonal to the plane along which the engaged samples lie, after the samples have been engaged with a given force and then displaced relative each other in a direction parallel to such plane (i.e., a shear direction), as a condition of the test.
  • this Shear Displacement simulates an engagement condition such as that which occurs when a hook-type fastener on a fastening member is engaged with a landing zone (including the loops component, of a hook-and-loop fastening system) on a wearable article when it is applied to a wearer, in that, following engagement of the fastener with the landing zone, tension in the fastening member pulls the fastener across the landing zone slightly (in a shear direction), resulting in a relative displacement along the shear direction between the two components.
  • a shear displacement affects the interaction of the hooks and loops components. For example, following a shear displacement, loops on the loops component may be caught, gathered and engaged in greater numbers, or engaged more tightly, about hooks, or the loops may be stretched, separated from their substrate, or broken in some number, etc.; while the hooks may be deformed to some extent from their relaxed shapes and orientations.
  • a fastening combination may sustain a given load orthogonal to the plane of engagement before separating, does not mean that the combination will be satisfactorily resistive to pop-off.
  • the Vertical Pull Test described herein it has been found that some examples of fastening combinations may exhibit a relatively brittle engagement, meaning that, once a particular Displacement is reached at the combination's Vertical Peak Load, exceeding that Displacement causes the vertical load sustained by the combination to drop relatively quickly to zero—in other words, the fastening combination appears to suddenly “let go”, or “pop” apart.
  • the Vertical Peak Load that these examples can sustain is not sufficiently high, they can be relatively, unsatisfactorily susceptible to pop-off when placed in their intended use.
  • fastening combinations may have a relatively more elastic or tenacious engagement, meaning that, once a particular Displacement is reached at the combination's Vertical Peak Load, exceeding that Displacement does not cause the vertical load sustained by the combination to drop as quickly to zero—in other words, the fastening combination continues to resist separation, and exhibits a load sustaining capability, after Displacement at Vertical Peak Load is exceeded, that is relatively greater than the capability of the examples described in the preceding paragraph.
  • (I) Vertical Pull Test @ 1 mm Vertical Pull Test @ 2 mm Property/Value Shear Displacement Shear Displacement
  • (A) Vertical Peak Load (N) at least about 4.0; at least about 5.0; more preferably at least about more preferably at least about 8.0; or 15; or even more preferably at least even more preferably at least about 12 about 20
  • (B) Displacement at Vertical (1) at least about 0.5; (1) at least about 0.5; Peak Load (mm) (only in more preferably at least about more preferably at least about combination with other 1.0; or 1.0; or values (A), (C) and/or (D), as even more preferably at least even more preferably at least set forth below) about 1.5; about 1.5; and optionally, preferably, and optionally, preferably, (2) less than about 6.0; (2) less than about 5.0; more preferably less than more preferably less than about 4.0; or about 4.0; or even more preferably less than even more preferably less than about 2.0 about 3.0 (C) Great
  • a fastening combination exhibiting one or more combinations of the values (A)-(D) set forth in the table above will be more resistive to pop-off during use, than a fastening combination not exhibiting such combination of values.
  • a fastening combination may exhibit one of the following combinations of values from Column I above, when tested at a 1 mm Shear Displacement:
  • a fastening combination may exhibit combinations of values analogous to those described immediately above, but from Column H in the table above, when tested at a 2 mm Shear Displacement.
  • Fastening combinations having one or more of these combinations of values are expected to have high enough peak load sustaining capability for wearable articles such as disposable diapers, coupled with enough tenacity in the engagement, to resist pop-off under normal conditions, and a suitably tight engagement.
  • a fastening combination exhibiting a value (A), (C) or (D) as set forth in the table above that is equal to or greater for a Shear Displacement of 2 mm than for a Shear Displacement of 1 mm would be expected to be more resistive to pop-off than a fastening combination exhibiting values that do not satisfy this relationship. It is believed that a fastening combination exhibiting such a relationship of values is better able to accommodate varying shear displacements as are imposed in use by, e.g., varying sizes of wearers and/or varying tensions placed on fastening members by persons applying the associated wearable articles.
  • varying shear displacements as are imposed in use by, e.g., varying sizes of wearers and/or varying tensions placed on fastening members by persons applying the associated wearable articles.
  • Increasing the Stiffness of fastener zone 71 may serve to help reduce the likelihood or extent of fastener dishing.
  • a fastener zone 71 having a Stiffness of at least about 1,500 N/m may be helpful.
  • effecting an excessive increase in the stiffness of fastener zone 71 may be undesirable because it may result in the feel of an unyielding object against the diaper at the wearer's abdomen, and may be a source of discomfort for the wearer, particularly when the wearer is sitting and/or bending forward at the hips.
  • increasing stiffness in the fastener zone may necessitate increasing material thickness and/or density, adding cost.
  • a fastener zone 71 may be deemed too stiff under certain circumstances, for these reasons.
  • fastener zone 71 has a Stiffness of at least about 1,500 N/m, or 2,500 N/m, or 3,500 N/n, or 4,000 N/m, and the fastening member has one or more of the shape and construction characteristics identified and described herein.
  • the fastener zone has a Stiffness of no more than about 9000 N/m, or 7,500 N/m, or even 6,000 N/m.
  • fastener zone 71 may overlap one or more underlying layers of materials in end region 55 which may both contribute to Stiffness of fastener zone 71 , and may also extend from fastener zone 71 in an inboard direction.
  • An intermediate region 57 may include such underlying material(s), and have its own Stiffness.
  • intermediate region 57 is imparted with an intermediate Stiffness that is less than the Stiffness of fastener zone 71 , but greater than the Stiffness of panel region 56 and/or extensible zone 66 , this may have the advantages of bearing and resisting longitudinal force components that develop within the panel region 56 , and preventing their transfer to fastener zone 71 , thus reducing the likelihood of dishing of fastener 70 , as well as reducing the likelihood of buckling/flipping in panel region 56 , without substantially compromising wearer comfort afforded by a highly-extensible, pliable panel region 56 .
  • intermediate region 57 may be imparted with an intermediate Stiffness of between about 200 N/m and about 1000 N/m, or between about 300 N/m and about 750 N/m, or even between about 400 N/m and about 600 N/m.
  • Intermediate region 57 or a portion thereof, as well as panel region 56 may be imparted with any additional Stiffness characteristics, including variations and gradients thereof, as described in co-pending U.S. application Ser. No. 11/895,169.
  • a fastening member may have an extensible zone 66 formed of a stretch laminate that has been activated by mono-axial stretching of the section of the laminate which contains the laminated-in elastomeric material layer 64 , or a portion thereof, in a manner described in more detail, for example, in U.S. Pat. No. 4,834,741, and in published PCT applications Nos. WO 1992/015446 and WO 1992/015444, which are incorporated herein by reference.
  • extensible zone 66 may include force-focusing features such as described in U.S. Published Application No. 2007/0142815.
  • a fastening member 50 a may have an extensible zone 66 having regions of varying moduli of elasticity.
  • extensible zone 66 may have a relatively higher modulus region 101 , and relatively lower modulus regions 100 as suggested.
  • High modulus region 101 may be disposed at or about the longitudinal center of extensible zone 66 as suggested in FIG. 7 , or may be disposed at other locations. In the example suggested in FIG. 7 , however, relatively high modulus region 101 will bear a greater proportion of lateral tension forces per surface area, thus “focusing” lateral tension forces toward the longitudinal center of the fastening member.
  • stresses acting along longitudinally outermost edges 68 , 69 are reduced while overall lateral tension in the fastening member is maintained such that the article maintains good fit, while likelihood of fastener zone dishing may be reduced.
  • Other examples of materials including zones of differing moduli are described in, for example, PCT Application Nos. WO 2007/069227 and WO 2008/084449.
  • a relatively highly extensible, more pliable material may be less robust, and have less resistance to tearing. This may become an issue, for example, when an applier tugs on end region 55 in order to apply the diaper to a wearer. If the applier tugs with sufficient lateral force, material forming panel region 56 may tear, particularly at locations where stress concentrates, such as, for example, where the fastening member shortens to an end region and/or a discontinuity in fastening member construction results in an abrupt transition from relatively more pliable portion of the fastening member to a relatively stiffer portion of the fastening member. Referring to FIG.
  • fastener zone 71 may comprise a patch of material which, when affixed to a substrate, creates a combination of the patch material and the substrate having greater stiffness than that of adjoining substrate alone.
  • fastener zone inboard edge 88 when fastening member 50 a is loaded under lateral tension along stretch direction 67 , stresses may concentrate along fastener zone inboard edge 88 .
  • the fastener 70 may occupy a shortened end region, stresses may be especially concentrated in the substrate along first and second longitudinally outermost lateral edges 68 , 69 , at first and second inboard fastener zone corners 72 , 73 .
  • the manufacturer increases the amount of stretch and/or pliability for the selected material forming panel region 56 by reducing basis weight, the likelihood of tearing at first and/or second inboard fastener zone corners 72 , 73 may increase.
  • the manufacturer may form end region 55 of a material or combination of materials that has greater tensile strength at least in the lateral direction, or in several directions, than the material(s) forming the extensible zone.
  • the manufacturer may add a reinforcing layer to end region 55 to form a laminate section at end region 55 having greater tensile strength in at least the lateral direction, or in several directions, than the material(s) forming the extensible zone. Either approach may be used to form a strengthened end region 155 .
  • “strengthened,” with respect to an end region of a fastening member means an end region that has greater tensile strength in at least the lateral direction, than the material(s) forming the extensible zone).
  • FIG. 9 schematically depicts a simplified lateral, exploded cross section of one example of a fastening member 50 a having a strengthened end region 155 .
  • a fastening member 50 a may have an extensible zone 66 between inboard and outboard extensible zone extents 86 , 87 , an inextensible inboard zone 83 , and an inextensible end region 55 .
  • a fastening member 50 a may be constructed in several layers and may have one or two surface layers 62 , 63 , which may consist of a nonwoven material, and an elastomeric material layer 64 laminated to and/or between the one or two surface layers 62 , 63 , to form a stretch laminate.
  • Suitable examples of stretch laminates and elastomeric films for forming panel region 56 and/or extensible zone 66 include those described in copending U.S. Published Application No. US 2007/0293111.
  • the one or two surface layers 62 , 63 may be wider along stretch direction 67 than the elastomeric material layer 64 , and may be bonded together in regions forming end region 55 and inboard zone 83 .
  • the inboard zone 83 may be formed of only the two surface layers 62 , 63 bonded together.
  • the end region 55 may be reinforced by a reinforcing layer 61 having reinforcing layer inboard edge 89 , thereby forming strengthened end region 155 .
  • Reinforcing layer 61 may be disposed in an overlapping zone 84 , in overlapping relationship with elastomeric material layer 64 .
  • the width of the reinforcing layer 61 and/or the width of the elastomeric material layer 64 may be adjusted so that their edges overlap to form an overlapping zone 84 of desired width.
  • the reinforcing layer 61 may be formed of, for example, a nonwoven material. Inclusion of reinforcing layer 61 may be used to impart greater tensile strength in at least the lateral direction, to end region 55 , than it would have absent a reinforcing layer.
  • the reinforcing layer 61 may be disposed between the surface layers 62 , 63 and beneath the elastomeric material layer as suggested in FIG.
  • strengthened end region 155 may comprise one layer, or a plurality of layers of material forming a laminate, that is discrete from material forming panel region 56 , bonded at its inboard edge to the outboard edge of an adjoining material forming panel region 56 and/or extensible zone 66 , or component thereof.
  • a fastener 70 may be affixed to an outside surface of strengthened end region 155 .
  • Fastener 70 , and layers 61 , 62 , 63 and 64 may be laminated together in a laminate structure, by any suitable adhesive and/or other bonding laminating technique(s).
  • Reinforcing layer 61 and/or strengthened end region 155 may be formed of materials selected so as to impart, or contribute to imparting, a desired amount of Stiffness to fastener zone 71 and/or intermediate region 57 , as described above.
  • the extensible zone 66 may be narrower in width than the elastomeric material layer 64 , and end at a location inboard of the overlapping zone 84 , providing a relatively inelastic portion including overlapping zone 84 , for anchoring the reinforcing layer 61 to elastomeric material layer 64 and transitioning to the strengthened end region.
  • reinforcing layer 61 may be sized so as to extend from end region 55 in an inboard direction to form strengthened end region 155 , ending on the inboard side at reinforcing layer inboard edge 89 .
  • Reinforcing layer 61 may have a length LR along its inboard edge 89 extending between first and second longitudinally outermost lateral edges 68 , 69 , and a width WR from the fastener zone outboard edge 75 to reinforcing layer inboard edge 89 .
  • the manufacturer may wish to design and manufacture fastening member 50 a so that it will sustain a particular lateral tension load before any failure in the material from tearing, delamination/separation, breaking of bonds, etc.
  • the manufacturer may require and design fastening members to sustain, for example, at least 18 N, 24 N, 30 N or even 34 N of lateral peak tension load before failing, when pulled at a speed sufficient to accomplish a strain rate in the extensible zone of between about 5 seconds ⁇ 1 to about 40 seconds ⁇ 1 .
  • the weakest location of a particular material forming panel region 56 may be, for example, along its longitudinally shortest dimension, i.e., the point at which the smallest longitudinal cross section of material is subject to the stress required to sustain the lateral load (without support from any stiffening or reinforcing layer).
  • surface layers 62 , 63 may be laterally weakened in the activation process.
  • the weakest portion of fastening member 50 a might in some circumstances be along reinforcing layer inboard edge 89 , or along, for example, outboard extensible zone extent line 87 —at which a combination of activation-weakened material and relatively small longitudinal dimension of extensible zone 66 exists. Accordingly, when a strengthened end region 155 of a fastening member 50 a having a layered construction as depicted in FIG. 9 , is desirably sized, failure of materials forming the fastening member 50 a under lateral loading might be expected to occur, on average, at a location proximate to the strengthened end region/reinforcing layer inboard edge, rather than elsewhere on the fastening member.
  • a width for a reinforcing layer 61 or a strengthened end region 155 that substantially exceeds this desirably-sized value may compromise the extensibility of the fastening member, reduce the width of the extensible zone, or may be unneeded to provide the required design strength, and thus, add unnecessary material cost, while a width less than this value may increase the likelihood of failure under a lateral load below the intended design load.
  • reinforcing layer 61 may be sized so as to have an affixed width WR overlapping and affixed to other layer(s) in overlapping zone 84 , and so that its affixed inboard edge 89 (and thus, the inboard edge of strengthened end region 155 ) lies along a line at which the affixed length along inboard edge 89 is of a length LR that is from about 66 percent to about 80 percent, or from about 69 percent to about 77 percent, or even from about 71 percent to about 75 percent, of the length L of the fastening member along junction line 51 .
  • a reinforcing layer/strengthened end region sized within one or more of these ranges desirably bears and/or reduces stress concentrations about the fastener zone when the fastening member is under lateral tension load, and achieves a satisfactory balance between minimizing the likelihood that the fastening member will tear under lateral loading in an amount less that its intended design provides, while at the same time minimizing added material costs resulting from inclusion of a strengthened end region.
  • a member having the shape and dimensions shown in FIG. 10A might be cut from a suitable combination laminate, having the layers shown in FIG. 10B . All numerical values shown in FIG. 10A are in millimeters. (The drawing is not to scale.) In cross section the exemplary fastening member may have the general layered configuration depicted in FIG. 10B .
  • the laminate assembly from which the fastening ear might be cut, including first surface layer 62 , elastomeric material layer 64 , second surface layer 63 and reinforcing layer 61 might be formed of materials as follows:
  • Layer Material Fastener 70 APLIX 963 available from Aplix Fastener UK Ltd., Suffold, England Adhesive (between hot melt adhesive, BOSTIK H2988F01, fastener 70 and available from Bostik, Middleton, MA, applied reinforcing at about 150 gsm (grams per square meter) layer 61) Reinforcing Layer 61 40 gsm monolayer spunbond polypropylene nonwoven, PROWEB, available from Rheinische Kunststoffwerke, Gronau Germany Adhesive (between hot melt adhesive, BOSTIK H2511, available reinforcing layer 61 from Bostik, Middleton, MA, applied at about and first surface 40 gsm layer 62) First Surface Layer 62 31 gsm high elongation carded (HEC), point- bonded nonwoven, FPN 332D available from Fiberweb, Simpsonville, SC Adhesive (between hot melt adhesive, BOSTIK H2511, available first surface layer from Bostik, Middleton, MA, applied
  • Stiffness is measured using a constant rate of extension tensile tester with computer interface (a suitable instrument is an MTS Alliance under TestWorks 4 software, as available from MTS Systems Corp., Eden Prairie, Minn.) fitted with a 10 N load cell.
  • a plunger blade 2100 shown in FIG. 12 (front view) and FIG. 13 (side view), is used for the upper movable test fixture.
  • Base support platforms 2200 shown in FIG. 11 , are used as the lower stationary test fixture. All testing is performed in a conditioned room maintained at about 23 C ⁇ 2 C and about 50% ⁇ 2% relative humidity.
  • width and length of the test specimen are a lateral width and longitudinal length using the directional conventions corresponding to the fastening member from which the specimen is cut, as “lateral width” and “longitudinal length” are defined herein.
  • Components of the plunger 2100 are made of a light weight material such as aluminum to maximize the available load cell capacity.
  • the shaft 2101 is machined to fit the tensile tester and has a locking collar 2102 to stabilize the plunger and maintain alignment orthogonal to base support platforms 2204 .
  • the blade 2103 is 115 mm long 2108 by 65 mm high 2107 by 3.25 mm wide 2109 , and has a material contact edge with a continuous radius of 1.625 mm.
  • the bracket 2104 is fitted with set screws 2105 that are used to level the blade and a main set screw 2106 to firmly hold it in place after adjustment.
  • the bottom fixture 2200 is attached to the tensile tester with the shaft 2201 and locking collar 2202 .
  • Two movable support platforms 2204 are mounted on a rail 2203 .
  • Each test surface 2205 is 85 mm wide 2206 by 115 mm long (into plane of drawing) and made of polished stainless steel so as to have a minimal coefficient of friction.
  • Each platform has a digital position monitor 2208 which reads the individual platform positions, and set screws 2207 to lock their position after adjustment.
  • the two platforms 2204 are square at the gap edge and the plate edges should be parallel front to back.
  • the two platforms form a gap 2209 with an adjustable gap width 2210 .
  • a fastener for example, a specimen cut from the intermediate region
  • Stiffness (actual width) [Stiffness (13 mm) /13 mm] ⁇ actual width (mm)
  • Extensibility of the fastening member is measured using a constant rate of extension tensile tester with computer interface (a suitable instrument is a MTS Alliance under TestWorks 4 software, as available from MTS Systems Corp., Eden Prairie, Minn.) fitted with a suitable load cell.
  • the load cell should be selected to operate with 10% and 90% of its stated maximum load. All testing is performed in a conditioned room maintained at about 23 C ⁇ 2 C and about 50% ⁇ 2% relative humidity.
  • width and length of the specimen are a lateral width and longitudinal length as defined herein. Precondition specimens at about 23 C ⁇ 2 C and about 50% ⁇ 2% relative humidity for 2 hours prior to testing.
  • Each dimension is measured according to the following method. All testing is performed in a conditioned room maintained at about 23 C ⁇ 2 C and about 50% ⁇ 2% relative humidity.
  • width and length of the specimen are a lateral width and longitudinal length as defined herein. Precondition specimens at about 23 C ⁇ 2 C and about 50% ⁇ 2% relative humidity for 2 hours prior to testing.
  • This test is designed to measure the force, displacement as a function of force (and vice versa), and/or work necessary to separate a sample of a hooks fastener component from engagement with a loops component, which components may be used to form a hook-and-loop fastening system, such as often found on wearable articles, including but not limited to many kinds of disposable diapers.
  • the loops component may be the same as surrounding outer materials on the article; in some wearable article designs the nature of the outer material alone is sufficient to provide a fibrous surface that is effectively engageable with a hooks component, to provide the desired attachment.
  • Samples of respective landing zone material and hook material that have not been cut from finished manufactured wearable articles, but rather, taken from supplies of such materials prior to manufacture of articles, can be prepared in a manner similar to that set forth above.
  • the materials should be oriented and cut according to the orientation in which they would appear in a finished product, i.e., with shorter sides of the respective rectangular samples parallel with the direction of pull of the hooks against the loops.
  • a constant rate of extension tensile tester with computer interface (such as a MTS SYNERGIE 200 tensile tester, controlled with TestWorks 4 software, as available from MTS Systems Corp., Eden Prairie, Minn., or suitable equivalent), fitted with an appropriate load cell is used for this test.
  • the load cell should be selected to be operated within 10% and 90% of its stated maximum load.
  • the tensile tester is set up such that when the crosshead moves downward and compresses samples, a negative force reading is generated to indicate compression.
  • the first fixture 503 includes a rectangular foot 520 that attaches to the load cell of the tester, and has a downward-facing planar surface 522 orthogonal to the path of travel of the crosshead, onto which a Hooks Sample is to be affixed.
  • the second fixture 504 attaches to the bottom, stationary mount of the tensile tester, and consists of a base 513 and a solenoid-activated sliding plate 510 having an upward-facing planar surface 511 orthogonal to the path of travel of the crosshead, onto which the LZ Sample is to be affixed.
  • the loops side of the LZ Sample is oriented facing and parallel to, the hooks side of the Hooks Sample.
  • the upper fixture 503 consists of a rectangular foot 520 affixed to a suitable mounting device such as an upper mounting shaft 528 adapted to mount to the load cell as affixed to the movable crosshead of the tensile tester.
  • Upper mounting shaft 528 is threaded as shown, and has a locking collar 527 .
  • locking collar 527 is turned against the mount, to immobilize fixture 503 such that the surface 522 remains orthogonal to the travel axis.
  • the foot 520 is formed of aluminum with a downward-facing, planar, brushed-finish surface 522 orthogonal to the path of travel of the crosshead. Downward-facing surface 522 must be of sufficient length and width to accept the entirety of a Hooks Sample, shorter sides extending in a left-right direction, and must be substantially centered about the axis of upper mounting shaft 528 .
  • the lower fixture 504 consists of a base 513 , having two vertical plates 514 and 515 affixed at each end.
  • An electronic solenoid 516 (Sealed Linear Solenoid Actuator Extended Life—Sealed Pull type, Part No. 9719K112, McMaster Carr, Atlanta, Ga.—or suitable equivalent) is mounted on the left vertical plate 514 , with its plunger 517 extending to the right and protruding through a hole in plate 514 ; the hole is large enough to permit free left-right movement of plunger 517 .
  • a micrometer 518 Micrometer Head, Electronic type, 1′′ Max measuring range 0.00005′′ resolution, Part No.
  • the base 513 is affixed to a suitable mounting device that includes lower mounting shaft 529 , adapted to mount to the stationary mount of the tester. Lower mounting shaft 529 is threaded as shown, and has a locking collar 526 .
  • a horizontally sliding plate 510 has an integral tab as shown, connected to the solenoid plunger 517 .
  • Sliding plate 510 is affixed to plate guide 512 , which has a horizontal, left-right track machined therein which mates with guide rail 523 to allow free left-right movement, with no significant vertical play.
  • plate guide 512 and guide rail 523 are acquired from McMaster-Carr, Atlanta, Ga., Part No. 9880K3 (Frelon Plain-Bearing Guide Block); and Part No. 9880K13 (Frelon Plain-Bearing Rail).
  • Guide rail 523 is affixed to base 513 .
  • plate guide 512 and correspondingly, sliding plate 510 , may move in a horizontal, left-right direction relative base 513 , in response to activation of solenoid 516 .
  • Rightward movement of sliding plate 510 is limited by the distal end of micrometer spindle 519 , which sliding plate 510 abuts in the rightwardmost position.
  • Leftward movement of sliding plate 510 is limited by standoff 525 , which plate guide 512 abuts in the leftwardmost position.
  • Guide rail 523 terminates at standoff 525 , which also is affixed to base 513 .
  • Standoff 525 holds two recessed springs 524 that apply a sufficient force against the plate guide 512 to push the sample plate 510 to abutting relationship with the distal end of micrometer spindle 519 when solenoid 516 is not activated. Once activated, solenoid 516 pulls the sliding plate 510 toward the left, until plate guide 512 stops against standoff 525 .
  • An aluminum sample plate having a planar, brushed-finish upward-facing surface 511 is affixed to the top surface of the sliding plate 510 .
  • Upward-facing surface 511 must be of sufficient length and width to accept the entirety of an LZ Sample, shorter side extending in a left-right direction, and must be substantially centered about the axis of lower mounting shaft 529 .
  • the fixtures are configured such that when both upper fixture 503 and lower fixture 504 are installed on the tester, upper mounting shaft 528 and lower mounting shaft 529 are substantially coaxial, i.e., are aligned along the direction of pull of the crosshead.
  • the fixtures are configured such that when Hooks and LZ Samples are properly placed thereon and the fixtures are installed on the tester, the geometric centers of the rectangular shapes of the Samples are substantially aligned on a vertical axis when the Samples are engaged, prior to being offset by a Shear Displacement.
  • the fixtures should be adapted such that, when installed on the tester, downward surface 522 on upper fixture 503 and upward surface 511 on lower fixture 504 are parallel to each other and orthogonal to the vertical line of travel of the crosshead.
  • All testing is performed in a conditioned room maintained at about 23° C. ⁇ 2 C.° and about 50% ⁇ 2% relative humidity. Precondition the samples at about 23° C. ⁇ 2 C.° and about 50% ⁇ 2% relative humidity for 2 hours prior to testing.
  • the rectangular Hooks Sample 502 and LZ Sample 501 are to be affixed onto the downward surface 522 and upward surface 511 , respectively, with short sides along the left-right direction (in FIG. 16B , along direction 534 - 536 ), and in a relative rotational orientation within a horizontal plane corresponding with the direction of shearing force the materials would encounter in use on a finished article, relative the Shear Displacement effected by solenoid 516 .
  • solenoid 516 will move the LZ Sample 501 to the left (direction 536 indicated in FIG. 16B ) relative the Hooks Sample 502 , for the selected Shear Displacement.
  • Remove the release backing on an LZ Sample Gently place the LZ Sample on upward-facing surface 511 , oriented as described above. After proper alignment, the LZ Sample should be affixed to surface 511 using a force of approximately 250 g, applied uniformly across the entire surface area of the sample, while surface 511 is oriented horizontally.
  • remove the release backing on a Hooks Sample Gently place the Hooks Sample on downward-facing surface 522 , oriented as described above. After proper alignment, the Hooks Sample should be affixed to surface 522 using a force of approximately 250 g, applied uniformly across the entire surface area of the sample, while surface 522 is oriented horizontally, facing up.
  • the solenoid 516 Activate the solenoid 516 to move the sliding plate 510 so that the plate guide 512 abuts the standoff 525 . Adjust the micrometer 518 to extend the spindle 519 until it abuts the sliding plate 510 . Zero the micrometer. Then, adjust the micrometer to retract the spindle 519 to the desired Shear Displacement (i.e., 1.00 mm or 2.00 mm, ⁇ 0.005 mm). Deactivate the solenoid 516 to allow the sliding plate 510 to move to the right so that it abuts the distal end of the micrometer spindle 519 . (To assure calibration, the micrometer should be reset to the desired shear distance after every 20 samples.)
  • the tensile tester is programmed to move the crosshead down at 5.0 mm/sec until it moves 40 mm, and then further descend at a rate of 0.5 mm/sec, until 1.00 N of compressive force is applied to the Samples to engage them. After 3 seconds, the solenoid 516 is activated to move the sliding plate 510 to the left (Shear Displacement) position, and held for an additional 3 seconds. Next, set the crosshead to zero.
  • Each LZ Sample and each Hooks Sample may be used for only one test. During the test, confirm that neither of the samples partially delaminates from the surfaces 511 , 522 . If any delamination is detected, the result is invalid.
  • test a minimum of ten landing zone/hooks sample pairs (n 10) and report as an average.
  • the Vertical Pull Test may be used to compare the performance of any particular combination of loops material and hooks material with any other particular such fastening combination, and may be useful in determining which combination is more suitable for use in a particular application. Accordingly, the Vertical Pull Test may be used to select a fastening combination of landing zone material and hooks material suitable for use on a wearable article, such as, but not limited to, a disposable diaper.
US12/904,212 2009-10-15 2010-10-14 Wearable Article with Extensible Fastening Member Having Stress Distribution Features and/or Fastening Combination Performance Characteristics, and Method of Testing and Selecting Fastening Combination Performance Characteristics Abandoned US20110092946A1 (en)

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TWI480549B (zh) * 2012-12-21 2015-04-11 Ind Tech Res Inst 彎曲應力的測試方法及其測試裝置
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WO2011047130A1 (fr) 2011-04-21
US20110092947A1 (en) 2011-04-21
ZA201202559B (en) 2013-09-25
WO2011047128A1 (fr) 2011-04-21
CN102573731B (zh) 2014-11-05
CN102575978B (zh) 2015-01-07
BR112012007903A2 (pt) 2019-09-24
EP2488137A1 (fr) 2012-08-22
MX2012004408A (es) 2012-05-08
IN2012DN02074A (fr) 2015-08-21
US9068912B2 (en) 2015-06-30
JP2013507200A (ja) 2013-03-04
CN102575978A (zh) 2012-07-11
CN102573731A (zh) 2012-07-11
CA2777781A1 (fr) 2011-04-21
BR112012008448A2 (pt) 2019-09-24
CA2777779C (fr) 2015-01-13
EP2488848A1 (fr) 2012-08-22
EP2488137B1 (fr) 2016-05-25
CA2777779A1 (fr) 2011-04-21

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