WO2004101000A2 - Article absorbant sans boucle - Google Patents

Article absorbant sans boucle Download PDF

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Publication number
WO2004101000A2
WO2004101000A2 PCT/US2004/012512 US2004012512W WO2004101000A2 WO 2004101000 A2 WO2004101000 A2 WO 2004101000A2 US 2004012512 W US2004012512 W US 2004012512W WO 2004101000 A2 WO2004101000 A2 WO 2004101000A2
Authority
WO
WIPO (PCT)
Prior art keywords
article
nonwoven
front portion
wings
backsheet
Prior art date
Application number
PCT/US2004/012512
Other languages
English (en)
Other versions
WO2004101000A3 (fr
Inventor
Hamzeh Karami
Original Assignee
First Quality Products, Inc.
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
Priority claimed from US10/431,200 external-priority patent/US20030220626A1/en
Priority claimed from US10/646,937 external-priority patent/US7621901B2/en
Application filed by First Quality Products, Inc. filed Critical First Quality Products, Inc.
Priority to EP04750509A priority Critical patent/EP1620050A4/fr
Priority to CA002525086A priority patent/CA2525086C/fr
Publication of WO2004101000A2 publication Critical patent/WO2004101000A2/fr
Publication of WO2004101000A3 publication Critical patent/WO2004101000A3/fr

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
    • A61F13/56—Supporting or fastening means
    • A61F13/5622—Supporting or fastening means specially adapted for diapers or the like
    • A61F13/565—Supporting or fastening means specially adapted for diapers or the like pants type diaper
    • 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

Definitions

  • the present invention relates to an absorbent article, and more particularly to an absorbent article having a fastener element which does not require a special loop-providing landing zone.
  • minihook fastener elements of relatively small longitudinal length (e.g., a fraction of an inch) adapted to engage miniloop fastener elements of relatively great longitudinal length (e.g., several inches) so that each minihook fastener element could be positioned as desired anywhere along the length of each miniloop fastener element.
  • Patent Application Publication No. 2002/0038110 Al In this manner the user is provided with a degree of flexibility or choice along one axis, albeit at additional material and manufacturing costs for the strip. It has even been proposed that one entire surface of an article be constituted of a miniloop fastener element in order to provide the user with total flexibility and choice (that is, the ability to position the ⁇ iinihook fastener element anywhere on the article surface), albeit at, an even greater material and manufacturing cost for the surface. See, for example, U.S. 5,019,065.
  • Disposable absorbent articles of the types mentioned hereinabove have different requirements as to the peel strength and shear strength of the various engagements depending, for example, on whether the engagement is about a waist or elsewhere, whether its fastening power is to be supplemented by the power of additional and possibly different fastener systems, etc.
  • a peel strength of at least 60 grams per square inch and a shear strength of at least 1300 grams per square inch is preferred.
  • an object of the present invention to provide a disposable absorbent article which, in one preferred embodiment, incorporates a fastener assembly consisting exclusively of a minihook fastener element without any miniloop fastener element beyond a conventional nonwoven material.
  • the fastener assembly is composed exclusively of a minihook fastener element and a nonwoven (preferably a spunbond nonwoven and optimally an elastic composite thereof).
  • a further object is to provide such an absorbent article wherein, in one preferred embodiment, the fastener assembly provides a peel strength of at least 60 grams per square inch and a shear strength of at least 1300 grams per square inch.
  • fastener assembly provides size adjustability or other features at the cost of only additional minihook fastener elements.
  • the article is one of a diaper, a T-shaped brief, and a pull-up.
  • the disposable absorbent article has a frontsheet and a backsheet and comprises a nonwoven defining an exposed
  • the article further comprises a rninihook fastener element forming a plurality of pins defining an exposed outer surface thereof.
  • the pins of the fastener element and the fibers and the interstices of the nonwoven are configured and dimensioned to provide, when the exposed outer surfaces of the fastener element and the nonwoven are mutually engaged, a peel strength of at least 60 grams per square inch and a shear strength of at least 1300 grams per square inch.
  • the article comprises a nonwoven defining an exposed outer surface of at least one of a frontsheet and a backsheet, the nonwoven containing a plurality of bonded fibers and a plurality of interstices defined thereby.
  • the article further comprises a minihook fastener element.
  • the fastener element has an average density of at least 1600 pins per square inch (PPSI) defining an exposed outer surface thereof, the pins being substantially circular and on average spaced less than about 300 microns apart at an exposed outer surface thereof, and includes a pin-bearing surface area of at least 0.5 inch 2 .
  • PPSI pins per square inch
  • the pins are on average spaced less than about 275 microns apart at an exposed outer surface thereof, and the nonwoven has a basis weight of 13-50 gsm.
  • the article comprises a nonwoven defining an exposed outer surface of at least one of a frontsheet and a backsheet, the nonwoven containing a plurality of bonded fibers and a plurality of interstices defined thereby.
  • the nonwoven is a 13-50 gsm spunbond, the fibers have an average size of about 1.3-3.0 denier, and the average size of the interstices is at least 644 micron 2 .
  • the article further comprises a minihook fastener element forming a plurality of pins defining an exposed outer surface thereof, each pin having an average diameter at the base thereof of at least 300 (preferably 390) microns and at the free end thereof of at least 375 (preferably 427) microns. The pins of the fastener element enter into the
  • the fibers are differentially bonded, optimally differentially point bonded.
  • the nonwoven is the article backsheet or, in the case of a T- shaped brief, the article wings.
  • the absorbent article is preferably a diaper, T-shaped brief or pull-up.
  • the diaper has a back portion, a front portion and a crotch portion connecting the back and front portions, one of the back and front portions including at least a laterally spaced pair of the fastener elements and the other of the back and front portions including the nonwoven.
  • the T-shaped brief has a back portion, a front portion, a crotch portion connecting the back and front portions,, and a pair of wings extending laterally from respective lateral edges of the back portion for partially overlapping connection about the front of the waist of a wearer, one of the wings having at least one of the fastener elements and the front portion including at least a first laterally spaced pair of the fastener elements adjacent a top thereof, and both of the wings including the nonwoven, whether elastic or non-elastic.
  • the pull-up has a back portion, a front portion and a crotch portion connecting the back and front portions, the back and front portions being adapted to be secured together in an emergency situation exclusively by at least one of the fastener elements and the nonwoven.
  • the front portion includes a single auxiliary fastener element between the first pair of fastener elements and adjacent a top of the front portion.
  • the front portion includes a second laterally spaced pair of the fastener elements adjacent a top thereof, the second pair being disposed between the first pair.
  • the first laterally spaced pair of fastener elements is substantially spaced inwardly from the lateral edges of the front portion.
  • the lateral edges of the front portion adjacent a top thereof are secured in a turned-under orientation to the frontsheet of the front portion, the first laterally spaced pair of fastener elements being on the backsheet of the
  • the first laterally spaced pair of fastener elements is disposed on the frontsheet of the front portion, and the front portion is disposed over at least one of said wings.
  • the first laterally spaced pair of said fastener elements is disposed on the backsheet of the front portion, and the front portion is partially disposed under at least one of the wings.
  • the partially overlapped one of the wings has an auxiliary fastener element on the backsheet thereof adjacent the free end thereof, thereby to enable fastening of the free end to the frontsheet of the overlapping one of the wings.
  • the partially overlapped one of the wings has an auxiliary fastener element on the backsheet thereof on an intermediate portion spaced from the free end thereof, thereby to enable fastening of the intermediate portion to the frontsheet of the overlapping one of the wings.
  • the wings are at least partially elastic, the nonwoven is a spunbond, and the nonwoven is at least the outer surface of the backsheet or a wing.
  • FIG. 1 is a top plan view (in a laid-out, fully stretched orientation on its backsheet) of a first embodiment of a disposable absorbent article according to the present invention, showing a T-shaped brief having three minihook fastener elements and a nonwoven;
  • FIG. 2 is a top plan view of a variant thereof
  • FIGS. 3-6 are fragmentary top plan views of the front portion of additional variants thereof;
  • FIG. 7 is an isometric view of a disposable absorbent article in the form of an assembled T-shaped brief according to the present invention
  • FIG. 8 is an isometric view of a third embodiment of a disposable absorbent article in the form of a ready-to-wear pull-up according to the present • invention
  • FIG. 9 is a top plan view of a second embodiment of a disposable absorbent article according to the present invention showing a diaper having two minihook fastener elements and a nonwoven;
  • FIG. 10 is an isometric view of a disposable absorbent article in the form of an assembled diaper according to the present invention.
  • FIG. 11 is a scanning electron microscope photograph showing a top plan view of a preferred fastener element according to the present invention
  • FIG. 12 is a similar photograph showing a side elevational view thereof
  • FIG. 13 is a fragmentary sectional view of a fastener element according to the present invention, to an enlarged scale, secured to a nonwoven as a tape tab;
  • FIG. 14 is a fragmentary sectional view of a fastener element according to the present invention, to an enlarged scale, secured to a nonwoven as a patch or strip.
  • the absorbent article 10 is in the form of a T-shaped brief 12, although it may alternatively be in the form of a diaper 14 (as illustrated in FIGS. 9 and 10) or a pull-up 16 (as illustrated in FIG. 8).
  • Each article 10 has a back portion 20, a front portion 22 and a crotch portion 24 connecting the back and front portions 20, 22.
  • the crotch portion 24 either alone or in combination with
  • leg openings 26 adapted to snugly receive the wearer's legs.
  • the leg openings 26 may be elasticized for a better, more leakproof connection with the wearer's legs.
  • the construction typically includes a frontsheet 30 (also referred to as a body-facing sheet or a liner, cover or top sheet) and a backsheet 32 (also referred to as a garment-facing sheet or barrier sheet).
  • An absorbent core (not shown) is disposed intermediate the frontsheet 30 and backsheet 32 and is typically formed of wood fluff or other absorbent material (and optionally contains gel-forming super-absorbent polymeric particles).
  • an acquisition/distribution layer (not shown) is disposed intermediate the absorbent core and the frontsheet 30, or may even include as a part thereof the frontsheet 30.
  • the drawings herein illustrate only the frontsheet 30 and backsheet 32 of the constructions along with any fastener assemblies, thus ignoring for expository purposes the absorbent core, any internal acquisition/distribution layer, and the like.
  • a pair of wings 40 extend laterally from respective lateral edges of the back portion 20.
  • the free ends of the two wings 40 are brought around the sides and front of the waist of the wearer and make a partially overlapping connection about the front of the waist of the wearer.
  • one of the wings 40 has at least one hook-type fastener element 4 body-facing surface 31 thereof, and the front portion 22 adjacent the top thereof (when the brief 12 is being worn) has at least a first laterally spaced pair of the hook-type fastener elements 42 on the frontsheet 30 thereof (the frontsheet 30 of the front portion 22 facing towards the wearer when the brief 12 is being worn).
  • the fastener elements 41, 42 are exemplified herein as tape tab fastener elements permanently secured - - in use in a non-overlapping relationship - - to both the front and back (i.e., frontsheet 30 and backsheet 32) of an edge of a back portion 20 or front portion 22, or to both the front and back (i.e., a body-facing surface 31 and a garment-facing surface 33) of an edge
  • each wing 40 includes as at least the garment-facing surface 33 thereof (facing away from the wearer when the brief 12 is worn) the nonwoven 50.
  • the wings 40 may be elastic, non-elastic or partially elastic.
  • Elastic wings may be made of a composite of an elastic film laminated between two nonwovens preferably spunbonds. A suitable composite is available from Treadgar Company under the designation FABRIFLEX 307. Even where the wings 40 are non-elastic, the degree of overlap in the connection between the wings 40 (to form the belt 44) will vary with the waist size of the wearer. While a large- waisted person may have each of the first pair of fastener elements 42 contacting a respective wing 40, a small-waisted person may have both of the pair of fastener elements contacting a single wing 40 which almost completely overlaps the other wing 40.
  • the wings 40 are at least partially elastic since there is a tendency for a wearer (or caregiver who puts the brief on the wearer) to stretch one wing 40 more than the other wing 40 during the process of fastening the wings 40 to form the belt 44. This is less of a problem where the back portion 20 as well as the wings 40 are elastic, but more of a problem where the back portion 20 is not elastic and thus the stretching of the belt 44 is limited to the wings 40.
  • the wings 40 need not be secured together at the front of the wearer to form (with the back portion 20) a belt 44. Instead, they are secured by the wearer to opposite lateral edges of the front portion 22 by fastener elements 42 so that the wings 40 form a belt 44 including both the front and back portions 22, 20.
  • the T-shaped brief 12 described above and illustrated in FIGS. 1 and 7 is susceptible of various improvements through relocation of the first pair of fastener elements on the front portion and/or the deployment of additional (auxiliary) fastener elements on either the front portion or the belt. These improvements are made possible by the ability of the fastener element to make an engagement without the presence of a landing zone.
  • a single auxiliary fastener element 51 is positioned centrally between the first pair of fastener elements 42A (the latter being generally adjacent the lateral edges and top of the front portion 22).
  • the tendency of the front portion 22 to billow forwardly from the belt 44 and form a pocket is overcome.
  • the result is a flatter front portion 22 which more closely conforms to the contours of the belt 44 for a neater appearance and for reducing the possibility of spillage therebetween.
  • a second laterally spaced pair of fastener elements 52 are disposed between a first pair of fastener elements 42B and adjacent the top of the front portion 22, again acting to provide a flatter front portion 22.
  • the first pair 54 of fastener elements is simply substantially spaced inwardly from the lateral edges of the front portion 22 (e.g., by 1-2 inches) so as to make a connection with the belt 44 which is closer to the vertical centerline of the front portion 22 (and presumably the wearer), with the specific advantages noted hereinabove.
  • the fastener elements 42A, 42B, 51, 52 and 54 have been exemplified herein as patch or strip elements which are directly and permanently secured in back-to-face overlapping relationship to a frontsheet 30, backsheet 32 or wing 40 (e.g., by a hot melt or pressure-sensitive adhesive, ultras onically, etc). See, for example, FIG. 13.
  • FIGS. 1-4 require the fastener elements 41, 42, 42A, 42B, 52, 54 to be disposed on the frontsheet 30 of the front portion 22 of the T-shaped brief 12 so as to make the desired contact with the garment-facing wing surface 33 or backsheet 32 of the belt 44, this is not always a practical arrangement.
  • the backsheet or garment-facing surface 32 of the front portion 22 is typically a spunbond nonwoven in order to provide strength and desirable feel to a caregiver
  • the body-facing frontsheet 30 of the T-shaped diaper 12 may be made of more fragile material selected for its properties as a liner or as part of
  • the free end corners 56 formed by the top and an adjacent lateral edge of the front portion 22 are turned under and secured in that position (for example, by a few drops of hot- melt glue applied therebetween).
  • the pair of tape tab fastener elements 58 are then attached on the turned-under corners 56, on the original backsheet 32 of the front portion 22 (now facing the wearer). Since it is preferred to manufacture the T-shaped brief with both the front and back portions 22, 20 having similar lateral (horizontal) extensions, this solution has the advantage of enabling such a preferred production technique while still positioning the
  • the pair of patch fastener elements 62 are secured to the backsheet 32 of the front portion 22 (adjacent the top thereof) - - without any turning under of corners 56 - - and the top segment of the front portion 22 is then inserted (e.g., tucked) under the belt 44 so that the fastener elements 62 on the backsheet 32 of the front portion 22 will engage the frontsheet 30 of the belt 44 (actually the body-facing surface 31 of a wing 40).
  • the fastener element of the present invention to engage any portion of the belt backsheet 32 (rather than a limited loops landing zone) enables this ' ⁇ jlind" operation to proceed easily and rapidly even though the fastener elements 62 are not themselves visible during the cking-in step.
  • the pressure of the belt 44 on the top of the front portion 22 assists in maintaining the top of the front portion 22 flat and in engagement with the frontsheet 30 of the belt 44.
  • the fastener elements 62 may be disposed adjacent the lateral edges of the front portion 22 or more centrally thereof as the retention of the front portion 22 in its desired position relies not simply on the fastener elements 62, but also on the squeezing of the top of the front portion 22 between the wearer and the belt 44.
  • the first or outer wing 40A overlaps the second or inner wing 40B (without the primary fastener element) so that the primary fastener element secures the free end of the first wing 40A to the second wing 40B (albeit more to one side of the wearer than to the front of the waist of the wearer).
  • an auxiliary fastener element 70 is preferably provided on the outer garment-facing surface 33 of the second wing 40B at or adjacent the free end thereof.
  • This auxiliary fastener element 70 may be used to fasten the free end of the second wing 40B to the overlapping inner body-facing surface 31 of the first wing 40A at a point remote from the free end of the first wing 40A , thereby to maintain the free end of the second or inner wing 40B neatly in place under the first or outer wing 40A.
  • an auxihary hook fastener 72 is preferably provided on the outer garment-facing surface 33 of the second or inner wing 40B more adjacent the main segment of the back portion 20.
  • the auxiliary fastener element 72 would be located on the front center of the brief 12 when worn by a small-waisted person and provide another point of engagement between the two wings 40A, 40B, so as to prevent formation of a pocket therebetween.
  • an auxiliary fastener element 70, 72 on the outer garment-facing surface 33 of the second or inner wing 40B may serve two different functions depending on how far the auxiliary fastener element is spaced from the free end of the second or inner wing 40B.
  • the auxiliary fastener element 70 on the second or inner wing 40B is adjacent the free end thereof, thereby to maintain that free end under the first or outer wing 40A; while the auxiliary fastener element 72 is well spaced from the free end of the second or inner wing 40B, thereby to maintain the
  • auxiliary fastener 72 may alternatively be provided at about the same location by an auxiliary fastener element (not shown) on the inner body-facing surface 31 of the first or outer wing 40A at a corresponding location.
  • both auxiliary fastener elements 70, 72 may be provided on a single T-shaped brief 12 so that either may be employed or both may be employed simultaneously. Indeed, many of the auxiliary fastener elements described hereinabove may profitably be employed together.
  • tape tab or patch fastener elements 76 adjacent opposed lateral edges of the back portion 20
  • a pull-up 16 is characterized by at least one permanent side seam 81, preferably two heat-sealed side seams 81, but is often provided with a line of weakness.82, or preferably a pair of lines of weakness 82 (typically extending from each leg opening 26 to the top of the front waist portion 32), for use in an emergency situation requiring rapid removal of the pull-up from the wearer.
  • emergency circumstances may not permit the wearer to remove the trousers, slacks or shoes so that the easiest and fastest removal of the pull- up is achieved by tearing it along the lines of weakness (which may be the heat- sealed side seams), thereby to enable removal thereof in the same manner as a conventional diaper.
  • this pull-up to be replaced or another
  • a tape tab fastener element according to the present invention 84 is provided along one side of each line of weakness 82 for potential engagement with a nonwoven 50 on the other side of each line of weakness. This enables replacement of the original pull-up or the putting on of a new pull-up much in the manner of a conventional diaper.
  • the hooks have a mushroom-like appearance, the substantial circularity of the mushroom caps facilitating a uniform and close spacing at the exposed outer surfaces of the caps.
  • the fastener element 42 must have the hooks (also called “pins") very closely spaced apart, an average density of at least 1600 pins per square inch (PPSI) preferably defining the exposed outer surface of the fastener element 42.
  • the pins should be spaced, on average, less than about 300 microns (preferably less than about 275 microns) apart at the exposed outer surface thereof.
  • each pin is preferably substantially circular, at least at the exposed outer surface thereof.
  • each pin has at a base thereof an average diameter of at least 300 (preferably 390) microns and at the free end thereof an average diameter of at least 375 (preferably 427) microns.
  • Such a pin design allows the desired density or packing of at least 1600 PPSI to be achieved.
  • the pin-bearing surface area of the fastener element (measured at the surface supporting the bases of the pins) should be at least 0.5 inch 2-
  • the fastener element is of a rectangular design, preferably it is at least one inch in width by a half inch in length, optimally at least two inches by one inch. While the fastener elements according to the present invention have been illustrated as rectangular in outline, they may also be of other polygonal designs. or even circular.
  • a preferred fastener element is available from Binder Macroplast LP of Germany under the trade designation #42-288-HX-200-PP3.
  • the fastener assemblies according to the present invention will require a peel strength of 60 grams per square inch and a shear strength of 1300 grams per square inch.
  • the auxiliary fastener element 51 according to the present invention on the front portion 22 and the two fastener elements according to the present invention on the garment-facing surface of wing 40B may have lower peel and shear strengths since they are not relied upon for maintenance of the T-shaped brief 12 in its basic essential orientation on the wearer.
  • the nonwoven 50 which defines an exposed outer surface of at least one of the frontsheet 30, backsheet 32, and wing 40, contains a plurality of bonded fibers.
  • the fibers may be bonded by a variety of different means well-known in the art mcluding thermal bonding, chemical bonding (e.g., by latex) hydroentanglement, and the like.
  • the fibers may be point bonded or area bonded, the area bonding typically indicating either a very large point or a plurality of very close points.
  • the fibers are point bonded by a thermal technique such as calendering to produce a fuzzy nonwoven having a percentage bonding area of about 15-30%.
  • the bonded fibers define therebetween a plurality of interstices (also called pores, apertures, openings, etc.).
  • a preferred nonwoven is a 13-50 gsm spunbond wherein the fibers have an average size of 1.3 to 3.0 denier and the average size of the interstices is at least 644 microns. While the bonding pattern may be uniform in both the machine direction (MD) and the cross direction (CD) of the nonwoven web, preferably the pattern differs for the MD
  • the backsheet may be formed of the above- identified nonwoven with a polypropylene or polyethylene film bacldng or as a laminate or like composite of a plurality of nonwovens.
  • nonwoven is preferably a spunbond having a basis weight of 13-50 grams per square meter (gsm)
  • shghtly higher basis weights of 20-40 gsm are preferred for use on the wings of a T-shaped brief
  • relatively lower basis weights of 15-30 gsm are preferred for the backsheet of the front and back portions.
  • a preferred non-elastic spunbond nonwoven is available from First Quality Nonwovens, Inc. under the trade designations "PILLOWBOND SPUNBOND” and "SPUNBOND NW147".
  • the fastener element and nonwoven are selected so that the pins of the fastener element enter into the interstices of the nonwoven when the exposed outer surfaces of the fastener element and the nonwoven are mutually engaged.
  • the number of fibers and the extent to which they are bonded together in the nonwoven provide the nonwoven with the strength necessary to provide a high level of shear strength.
  • the size of the spacing between adjacent surfaces of the pins of the fastener element at the exposed outer surface thereof is a factor of major significance providing the high level of shear strength. It is believed that the pins must have dimensions at the free ends thereof enabling the free ends to enter into the interstices (and possible through the interstices) defined by the fibers of the nonwoven. On the other hand, there is some evidence to the effect that the free ends of the pins need not pass through the , interstices of the nonwoven in order to mechanically engage the fibers of the nonwoven.
  • the pore size in the nonwoven typically affects the peel strength, a higher pore size providing
  • peel strength is in reality not of high importance as a practical matter for most applications, it often plays an importance role psychologically in providing reassurance against accidental opening of a fastened assembly. Accordingly, an elastic composite, as described hereinabove, is preferred for the wings 40 as the pore size will increase with stretching of the composite, thereby providing a good balance between peel strength and shear strength under actual use conditions (that is, when the composite is stretched by at least 100%).
  • the pore size of the composite under actual use conditions may strongly affect the degree to which the free ends of the pins can enter into or even pass through the interstices of the outer surface of the nonwoven of the composite.
  • the preferred fastener element of the present invention is preferred for use only with conventional nonwovens and has not been found to be particularly suitable for use with either the conventional VELCRO mini-loop fastener elements or the conventional loop-providing materials intended for use with conventional hook-type VELCRO fastener elements.
  • the fastener assembly according to the present invention has a shear strength substantially higher (and frequently several times higher) than that obtained by a conventional VELCRO-like hook-type fastener element with a comparable conventional nonwoven.
  • test followings procedures were used for determining the peel and shear resistance of a hook-type tape tab attached to a nonwoven.
  • a 9.8 lb weight is placed on one end of a nonwoven samples. The sample is then stretched out until the weight starts to move.
  • the hook-type tape sample (2 inches wide by 1 inch in length) is then applied to the nonwoven (the nonwoven being oriented in the same direction as it would be in actual use), and the rubber-covered hand-operated roller is rolled five times across the 2 inch width of the hook-type tape tab.
  • a constant rate of extension tensile tester (e.g., INSTRON Model 4442) is then set up with a full scale load of 10 lbs. and a cross-head speed of 12 inches per minute.
  • the draw separation is set at 1 inch and the test length at 2 inches, while for the tape shear test, the draw separation is set at 4 inches and the test length at 4 inches.
  • the nonwoven In the tape peel test, the nonwoven is inserted in the lower clamp and its jaws then closed, and the hook-type tape tab is inserted in the upper clamp and its jaws then closed. In the tape shear test, the nonwoven ends are inserted into respective upper and lower clamps, and the jaws of each closed. Testing is then begun, with the type of failure being noted (either nonwoven or tape) and the maximum load and load at break being reported.
  • a frontsheet or ' ⁇ jacksheet of a wing 40 or belt 44 refers to the “wearer-facing surface” or “garment-facing surface,” respectively, of the wing 40 or belt 44.
  • fastener element encompasses both a tape tab fastener element and a patch or strip fastener element except where the context of the specification requires otherwise.
  • the patch or strip fastener element is illustrated in FIG. 14 as a fastener element 82 directly and permanently secured in back-to-face overlapping relationship to a substrate 84, such as a frontsheet 30 or backsheet 32 of a rear portion 20 or front portion 22, or a body-facing wing surface 31 or garment- facing wing surface 33 of a wing 40.
  • the fastener element 82 may be secured to the substrate 84 by a variety of conventional means including hot melt adhesive, pressure-sensitive adhesive, ultrasonic welding, etc.
  • the tape tab fastener element is illustrated in FIG. 13 as permanently secured (in non-overlapping relationship when in use) to a base 84 such as both the front and back (i.e., frontsheet 30 and backsheet 32) of an edge of a back portion 20 or front portion 22, or to both the front and back (i.e., body-facing surface 31 and garment-facing surface) of an edge of a wing 40, by an
  • the tape tab 80 has disposed thereon at one end (the free or fastening end) a fastener element 82 and at the other end an edge of substrate 84.
  • the tape tab 80 includes at the substrate end a main body 86 permanently secured at 87 to the front sheet 30 or backsheet 32 or to the body-facing surface 31 or garment-facing surface 33, and a short strip of paper 88 (such as a release paper) permanently secured at the substrate end to the other of the frontsheet 30 or backsheet 32 or the other of the body-facing surface 31 or garment-facing surface 33.
  • the paper 88 strengthens the connection of the tape tab 80 to the substrate edge and at the same time provide a surface to which the fastener element will not engage. (It will be appreciated that such surface of the paper 88 may or may not also be one with which adhesives will not engage.)
  • the fastener element portion is initially folded over the edge prior to deployment into actual use.
  • the present invention provides an absorbent article which incorporates a fastener assembly consisting exclusively of a minihook fastener element, without any miniloop fastener element beyond a conventional nonwoven material, such as a spunbond nonwoven.
  • the fastener assembly provides a peel strength of at least 60 grams per square inch and a shear strength of at least 1300 grams per square inch and provides size adjustability and/or other features at the cost of only additional minihook fastener elements.
  • the disposable article may be a diaper, a T-shaped brief, or a pull-up.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)

Abstract

L'invention porte sur un article absorbant jetable comprenant un non tissé par filage direct formant au moins une partie d'une feuille de fond et d'une feuille frontale de l'article et formant une surface extérieure découverte contenant une pluralité d'interstices, et un élément de fixation à mini-crochets formant une pluralité d'épingles définissant une surface extérieure découverte. Les épingles de l'élément de fixation et les interstices du non tissé sont configurés et dimensionnés de façon à créer, lorsque les surfaces extérieures découvertes de l'élément de fixation et du non tissé sont raccordées, une résistance au pelage d'au moins 60 grammes par 2 pouce et une résistance au cisaillement d'au moins 1300 grammes par 2 pouces.
PCT/US2004/012512 2003-05-07 2004-04-23 Article absorbant sans boucle WO2004101000A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04750509A EP1620050A4 (fr) 2003-05-07 2004-04-23 Article absorbant sans boucle
CA002525086A CA2525086C (fr) 2003-05-07 2004-04-23 Article absorbant sans boucle

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/431,200 2003-05-07
US10/431,200 US20030220626A1 (en) 1999-08-18 2003-05-07 Loopless absorbent article
US10/646,937 US7621901B2 (en) 1999-02-10 2003-08-22 Disposable pant type absorbent article having improved multifold fastening system and method of making same
US10/646,937 2003-08-22

Publications (2)

Publication Number Publication Date
WO2004101000A2 true WO2004101000A2 (fr) 2004-11-25
WO2004101000A3 WO2004101000A3 (fr) 2005-05-06

Family

ID=33456530

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/012512 WO2004101000A2 (fr) 2003-05-07 2004-04-23 Article absorbant sans boucle

Country Status (3)

Country Link
EP (1) EP1620050A4 (fr)
CA (1) CA2525086C (fr)
WO (1) WO2004101000A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013072787A1 (fr) * 2011-11-18 2013-05-23 Kimberly-Clark Worldwide, Inc. Article absorbant jetable comportant un élément d'attache divisé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112022010950A2 (pt) 2019-12-06 2022-09-06 Johnson & Son Inc S C Dispensador e método de uso do mesmo

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4699622A (en) * 1986-03-21 1987-10-13 The Procter & Gamble Company Disposable diaper having an improved side closure
US4846815A (en) * 1987-01-26 1989-07-11 The Procter & Gamble Company Disposable diaper having an improved fastening device
US4964860A (en) * 1990-07-18 1990-10-23 The Procter & Gamble Company Detachable two piece absorbent garment
US5326612A (en) * 1991-05-20 1994-07-05 The Procter & Gamble Company Nonwoven female component for refastenable fastening device and method of making the same
ZA969572B (en) * 1995-11-29 1997-06-02 Kimberly Clark Co Creped hydroentangled nonwoven laminate and process for making
US5989236A (en) * 1997-06-13 1999-11-23 The Procter & Gamble Company Absorbent article with adjustable waist feature
US6669678B2 (en) * 2000-03-31 2003-12-30 Sca Hygiene Products Ab Absorbent article provided with a belt
US20020032428A1 (en) * 2000-09-12 2002-03-14 Asa Lindstrom Absorbent article

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of EP1620050A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013072787A1 (fr) * 2011-11-18 2013-05-23 Kimberly-Clark Worldwide, Inc. Article absorbant jetable comportant un élément d'attache divisé
RU2598311C2 (ru) * 2011-11-18 2016-09-20 Кимберли-Кларк Ворлдвайд, Инк. Одноразовое впитывающее изделие с разделяемым крепежным элементом

Also Published As

Publication number Publication date
EP1620050A2 (fr) 2006-02-01
EP1620050A4 (fr) 2009-05-13
CA2525086A1 (fr) 2004-11-25
WO2004101000A3 (fr) 2005-05-06
CA2525086C (fr) 2008-07-08

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