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WO2002003900A1 - Article absorbant comprenant un film microporeux a repere de positionnement - Google Patents

Article absorbant comprenant un film microporeux a repere de positionnement Download PDF

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Publication number
WO2002003900A1
WO2002003900A1 PCT/US2000/018725 US0018725W WO0203900A1 WO 2002003900 A1 WO2002003900 A1 WO 2002003900A1 US 0018725 W US0018725 W US 0018725W WO 0203900 A1 WO0203900 A1 WO 0203900A1
Authority
WO
WIPO (PCT)
Prior art keywords
microporous film
film
absorbent article
backsheet
graphics
Prior art date
Application number
PCT/US2000/018725
Other languages
English (en)
Inventor
Kazuyuki Ohnishi
Hiroyuki Ohgata
Original Assignee
The Procter & Gamble Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Procter & Gamble Company filed Critical The Procter & Gamble Company
Priority to EP00950310A priority Critical patent/EP1299061A1/fr
Priority to MXPA02012871A priority patent/MXPA02012871A/es
Priority to JP2002508359A priority patent/JP2004513680A/ja
Priority to PCT/US2000/018725 priority patent/WO2002003900A1/fr
Priority to AU2000263431A priority patent/AU2000263431A1/en
Priority to CA002416255A priority patent/CA2416255A1/fr
Publication of WO2002003900A1 publication Critical patent/WO2002003900A1/fr
Priority to US10/338,394 priority patent/US20030105443A1/en

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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
    • A61F13/51—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 outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51496—Backsheet, i.e. the impermeable cover or layer furthest from the skin having visual effects
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15772—Control

Definitions

  • TECHNICAL FIELD This application relates to absorbent articles comprising a microporous film with a mark for registration. More specifically, the present application relates to absorbent articles comprising a microporous film with a mark for registration used for controlling and correcting the phase and position of simultaneously advancing continuous microporous webs.
  • BACKGROUND For disposable absorbent articles, e.g., disposable diapers, it is often desired to provide graphic designs registered (registered graphics) on the predetermined position of the absorbent articles to enhance their aesthetic appearance and their consumer acceptance.
  • the positioning of a web preprinted with registered graphics such that the graphics are properly placed in relation to the rest of the absorbent articles is desirable, e.g., in order to provide a large-sized graphics without cutting it at an incorrect location. Therefore, the web pre-printed with registered graphics is also provided a mark for registration used for controlling and correcting the phase and position of simultaneously advancing pre-printed continuous webs.
  • Such graphic designs and marks for registration are typically preprinted on a part of layers that are positioned away from the wearer's body during use (often called “backsheet”) such that the wearer or the care taker can see graphic designs when in use of the absorbent article.
  • backsheet a part of layers that are positioned away from the wearer's body during use
  • Breathable polymer films that are particularly useful as backsheet materials for disposable absorbent articles typically have food surface characteristics that make them suitable for the application of multi-colored, high resolution graphics, which are consumer-preferred.
  • Such an absorbent article comprising a microporous film with registered graphics is disclosed in, e.g., PCT publication WO 99/32164.
  • the backsheet provides a liquid impervious barrier so that exudates absorbed and contained in the absorbent core of the article are prevented from leaking, and particularly so that urine stains outside the diaper are prevented.
  • the backsheet comprising microporous films also provides moisture permeability through the backsheet.
  • the backsheet used for absorbent articles is also preferably soft and/or flexible. It has been known that softness and/or flexibility of the backsheet is obtainable by, e.g., decreasing the caliper and/or the basis weight of the film used for a backsheet. However, decreasing the caliper and/or the basis weight of the film is problematic because it also lowers a "web" modulus of the film.
  • the film is typically tensioned for easiness of printing graphic designs and marks for registration on the film and/or joining to other members of the absorbent articles to assemble the absorbent articles
  • the low web modulus of the film contributes to creating significant variations of the strain, caused by the tensioning force during tensioning the film, on the film between each mark for registration.
  • Such significant variations of the distance between each mark for registration could disable or at least deteriorate controlling and correcting the phase and position of advancing pre-printed continuous webs. Therefore, the film preferably has at least a level of web modulus not to cause significant variations of the strain on the film for the stable operation of a registered phasing system.
  • the present invention is directed to an absorbent article comprising a topsheet, a backsheet, and an absorbent core therebetween.
  • the backsheet comprises a microporous film.
  • the microporous film is provided with a mark for registration for processing registered graphics.
  • the microporous film has a web modulus of not less than 160 gf/mm and a bending force of not more than 3.3 mgf • cm 2 /cm.
  • the microporous film also comprises a material having a material modulus of not less than 310 gf/mm 2 at 3 % strain.
  • FIG. 1 is a back view of one embodiment of a disposable pull-on diaper with exemplary graphics and registration mark;
  • FIG. 2 is a simplified plan view of the pull-on diaper of FIG. 1 in its flat, uncontracted state prior to formation;
  • FIG. 3 is a schematic diagram showing simplified representations of a portion of a continuous diaper backsheet web having consecutively spaced graphics and registration mark printed thereon;
  • FIG. 4 is a schematic diagram of alternative embodiment of a continuous diaper backsheet web having consecutively spaced graphics and registration mark
  • FIG. 5 is a schematic diagram of the first state for tensile stress measurement
  • FIG. 6 is a schematic diagram of the second state for tensile stress measurement
  • FIG. 7 is a cross sectional view taken along the line VII-VII shown in FIG. 6;
  • FIG. 8 is a schematic diagram of the third state for tensile stress measurement;
  • FIG. 9 is a cross sectional view taken along the line IX-IX shown in FIG. 8;
  • FIG. 10 is a schematic diagram of the forth state for tensile stress measurement
  • FIGS. 11 and 12 are schematic diagrams of the bending property measurement
  • FIG. 13 is a graph showing the bending hysteresis curve.
  • the term “comprising” means that other steps and other ingredients which do not affect the end result can be added. This term encompasses the terms “consisting of and “consisting essentially of.”
  • the term “absorbent article” refers to devices which absorb and contain body exudates, and, more specifically, refers to devices which are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body.
  • a preferred embodiment of an absorbent article of the present invention is the disposable absorbent article, pull-on diaper 50, shown in FIG. 1.
  • the term “diaper” refers to an absorbent article generally worn by infants and incontinent persons that is worn about the lower torso of the wearer.
  • the term “pull-on diaper” herein refers to pull- on garments worn by small children and other incontinent individuals to absorb and contain body exudates.
  • registered graphic refers to single or multiple color graphic objects that are printed on a web close to a specified pitch length on a relaxed web basis.
  • mark for registration or “registration mark” refers to a base mark to control and correct the phase and position of a web printed registered graphics.
  • web refers to a sheet-like material, such as film, woven, nonwoven, and/or combinations thereof.
  • the diaper 50 generally comprises a backsheet 52, a topsheet 54 and an absorbent layer 66 located between the backsheet 52 and the topsheet 54.
  • the topsheet 54 is located to be placed facing the body or nearest the body when the diaper is worn and is generally provided with a liquid permeable region so that body exudates can flow through the topsheet 54 to the absorbent layer 66.
  • the backsheet 52 which is placed away from the body during wear, is typically liquid impermeable so that outer clothing or other articles are not wetted by the body exudates.
  • the backsheet 52 comprises a microporous polymer film 53 printed with registered graphics, as described herein.
  • the backsheet 52 may further comprise a layer of nonwoven material 55 laminated to the microporous film 53, in which case there is provided a more cloth-like and garment-like feel than is typically obtained with a film backsheet only.
  • the diaper 50 has elastically extensible side panels 56 provided to ensure more comfortable and contouring fit by initially conformably fitting the pull-on diaper 50 to the wearer and sustaining this fit throughout the time of wear well past when it has been loaded with exudates.
  • Leg elastics 58 and waist elastic region 60 are also provided to enhance the fit around the legs and waist, respectively.
  • the side panels 56 are joined at seams to form a waist opening 63 and leg openings 62.
  • barrier cuffs as described in Lawson and Dragoo U.S. Patents 4,695,278 and 4,795,454 are a desirable feature for disposable absorbent articles.
  • skin care-type topsheets that are provided with lotion thereon for the purpose of reducing skin irritation and chafing are a desirable feature herein.
  • FIG. 1 shows the back view of the diaper 50 with an exemplary registered graphic 20 and a registration mark 30 positioned in about the upper region of the backsheet, on the back side of the diaper 50.
  • FIG. 2 there is shown a simplified plan view of an embodiment of a disposable absorbent article in its flat, uncontracted state prior to formation.
  • the registered graphic 20 is shown in the back region of the diaper with registered graphics 22 additionally shown in the front region.
  • the registered graphics 20 and 22 are positioned on the predetermined position of the diaper 50 such that the registered graphics 20 and 22 appear on the same position on each diaper without significant variation.
  • Each diaper may be printed with the same pattern of the registered graphics. Alternatively, each diaper may be printed with two or more different patterns of the registered graphics.
  • the registered graphics 20, 22 and the registration mark 30 are printed on the microporous film 53 of the backsheet 52.
  • the registered graphics 20, 22 may be printed on either side of the microporous film 53; i.e., the body facing side or the garment facing side as far as the registered graphics 20 and 22 are viewed when the diaper 50 is used.
  • the nonwoven material 55 preferably has transparency or at least translucency to the extent that the registered graphics 20 and 22 can be viewed through the nonwoven material 55.
  • An exemplary portion of a microporous film web 53 printed with registered graphics 20 and 22 and registration marks 30 is shown in FIG. 3 (for the purpose of illustration, the registered graphics and registration mark are simplified and those sizes are modified).
  • the microporous film web 53 in FIG. 3 is printed with four sets of graphics 21 comprising registered graphics 20 and 22 and a registration mark 30, each of which is separated by pitch length P.
  • One set of graphics 21 comprising registered graphics 20 and 22 and registration mark 30 is printed to correspond to the full length L of one assembled diaper.
  • the pitch length P is the same as the full length L of the diaper product.
  • the microporous film 53 is advanced on the manufacturing line such that the registered graphics 21 are phased with other members of the diaper such as a topsheet and an absorbent core and such that the registered graphics 21 appear on the same place of the diaper without significant variations.
  • the graphics 21 may be of any shape, design, color or size, and that single or multiple designs may be used.
  • the graphics 21 may be pre-printed on the microporous film 53. Alternatively pre-bonded, pre-applied, pre-cut, or pre-glued objects may be used. In the embodiment shown in FIG. 3, the graphics 21 comprises the registered graphics 20 and 22. Each pattern of the graphics 21 is the same throughout its entire length of the microporous film 53 . Alternatively, the graphic 21 may comprise two or more of different graphic patterns such that each assembled diaper has different patterns of graphics 21. For example, the microporous film 53 of FIG. 4 has two different patterns of graphics 21 B and 21 C and each pattern of the graphic 21 B and 21 C is disposed alternately along the length of the microporous film 53. When each pattern of the graphics 21 is the same throughout its entire length as shown in FIG.
  • each graphic 21A is preferably separated by the pitch length P which is the same as the full length L of the diaper product.
  • the graphics 21 comprises two patterns of the graphics 21 B and 21 C as shown in FIG. 4
  • each graphic 21 B and 21 C is not necessarily separated by the same pitch length P (i.e., two consecutive pitch lengths between the graphics 21 B and 21 C and between the graphics 21 C and 21 B may be different) as far as each registration mark 30 maintains the same pitch length without significant variations.
  • Registration marks 30 are used so that the optical sensors of the combining and cutting mechanisms can detect the marks and thereby to properly align and to trim the film or film/nonwoven backsheet combination.
  • the microporous film of the present invention accounts for such variations while providing softness and flexibility.
  • the detail of the microporous film is described hereinbelow. While the registration mark 30 of the diaper shown in FIG. 1 is visible and discrete from the graphic 21 , it is preferable that the registration mark 30 is a part of the graphic 21 such that the consumer does not recognize the presence of the registration mark while still being detectable by the machinery such as optical sensors.
  • the registration mark 30 may be part of the finished product but invisible to the consumer. Alternatively, it may be sized and placed such that they are removed when the film is trimmed, so that they are not a part of the finished product and thus not visible to the consumer.
  • the topsheet 54 and the backsheet 52 have length and width dimensions generally larger than those of the absorbent core 66.
  • the topsheet 54 and the backsheet 52 extend beyond the edges of the absorbent core 66 to thereby form the periphery of the diaper 50.
  • the topsheet 54, the backsheet 52, and the absorbent core 66 may be assembled in a variety of well known configurations.
  • the absorbent core 66 may be any absorbent member which is generally compressible, conformable, non-irritating to the wearer's skin, and capable of absorbing and retaining liquids such as urine and other certain body exudates.
  • the absorbent core 66 may be manufactured in a wide variety of sizes and shapes (e.g., rectangular, hourglass, "T"-shaped, asymmetric, etc.) and from a wide variety of liquid-absorbent materials commonly used in disposable diapers and other absorbent articles such as comminuted wood pulp which is generally referred to as airfelt.
  • absorbent materials examples include creped cellulose wadding; chemically stiffened, modified or cross-linked cellulosic fibers; tissue including tissue wraps and tissue laminates; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any equivalent material or combinations of materials.
  • the configuration and construction of the absorbent core 66 may vary (e.g., the absorbent core may have varying caliper zones, a hydrophilic gradient, a superabsorbent gradient, or .lower average density and lower average basis weight acquisition zones; or may comprise one or more layers or structures). Further, the size and absorbent capacity of the absorbent core 66 may also be varied to accommodate wearers ranging from infants through adults. However, the total absorbent capacity of the absorbent core 66 should be compatible with the design loading and the intended use of the diaper 50.
  • One embodiment of the diaper 50 has an asymmetric, modified T- shaped absorbent core 66 having ears in the front waist region but a generally rectangular shape in the rear waist region.
  • the absorbent core may further comprise the dual core system containing an acquisition/distribution core of chemically stiffened fibers positioned over an absorbent storage core as detailed in U.S. Patent 5,234,423, entitled “Absorbent Article With Elastic Waist Feature and Enhanced Absorbency” issued to Alemany et al., on August 10, 1993;. and in U.S. Patent 5,147,345, entitled “High Efficiency Absorbent Articles For Incontinence Management” issued to Young, LaVon and Taylor on September 15, 1992. All of these patents are incorporated herein by reference.
  • the topsheet 54 is preferably positioned adjacent the inner surface of the absorbent core 28 and is preferably joined thereto and to the backsheet 52 by attachment means (not shown) such as those well known in the art. Suitable attachment means are described with respect to joining the backsheet 52 to the absorbent core 66. In a preferred embodiment of the present invention, the topsheet 54 and the backsheet 52 are joined directly to each other in the diaper periphery and are indirectly joined together by directly joining them to the absorbent core 66 by any suitable attachment means.
  • the topsheet 54 is preferably compliant, soft feeling, and non-irritating to the wearer's skin. Further, the topsheet 54 is preferably liquid pervious permitting liquids (e.g., urine) to readily penetrate through its thickness.
  • a suitable topsheet 54 may be manufactured from a wide range of materials such as woven and nonwoven materials; polymeric materials such as apertured formed thermoplastic films, apertured plastic films, and hydroformed thermoplastic films; porous foams; reticulated foams; reticulated thermoplastic films; and thermoplastic scrims.
  • Suitable woven and nonwoven materials can be comprised of natural fibers (e.g., wood or cotton fibers), synthetic fibers (e.g., polymeric fibers such as polyester, polypropylene, or polyethylene fibers) or from a combination of natural and synthetic fibers.
  • the topsheet 54 can be rendered hydrophilic by treating it with a hydrophilic finishing oil or a surfactant. Suitable methods for the treatment for the topsheet 54 include spraying the topsheet 54 material with surfactant and immersing the material into the surfactant. A more detailed discussion of such a treatment and hydrophilicity is contained in U.S. Patent No. 4,988,344 entitled "Absorbent Articles with Multiple Layer Absorbent Layers" issued to Reising, et al.
  • the topsheet 24 may be a carded nonwoven material which is formed by fibers treated with hydrophilic finishing oil.
  • the backsheet 52 is that portion of the diaper 50 which is generally positioned away from the wearer's skin and which prevents the exudates absorbed and contained in the absorbent core 66 from wetting articles which contact the diaper 50 such as bedsheets and undergarments.
  • the backsheet 52 is impervious to liquids (e.g., urine) and is preferably manufactured from a thin plastic film, although other soft, flexible liquid impervious materials may also be used.
  • the term "flexible” refers to materials which are compliant and will readily conform to the general shape and contours of the human body.
  • the backsheet 52 While the backsheet 52 is impervious to liquids, the backsheet 52 permits moisture to escape from the diaper 50.
  • the moisture vapor transmission rate of the backsheet 52 is important in reducing the incidence of heat rash and other skin problems associated with high humidity conditions.
  • the backsheet 52 has a weighed average moisture vapor transmission rate of not less than about 40 g/m 2 /hr, preferably not less than about 80 g/m 2 /hr, more preferably not less than about 100 g/m 2 /hr. While the upper end of the moisture vapor transmission rate depends on a type of a material, and is selected in relation to the liquid impermeability/dampness of the backsheet, the moisture vapor transmission rate may be not more than about 1 ,000 g/m 2 /hr.
  • the moisture vapor transmission rate is measured by "Testing Methods of Water Vapour Permeability of Clothes - JIS L 1099" disclosed in
  • Method A-1 Calcium chloride method
  • the backsheet 52 is preferably positioned adjacent the outer surface of the absorbent core 66 and is preferably joined thereto by any suitable attachment means known in the art.
  • the backsheet 52 may be secured to the absorbent core 66 by a uniform continuous layer of adhesive, a patterned layer of adhesive, or an array of separate lines, spirals, or spots of adhesive.
  • Adhesives which have been found to be satisfactory are manufactured by H. B. Fuller Company of St. Paul, Minnesota and marketed as HL-1358J.
  • An example of a suitable attachment means comprising an open pattern network of filaments of adhesive is disclosed in U.S. Patent 4,573,986 entitled "Disposable Waste-Containment Garment", which issued to Minetola et al. on March 4, 1986.
  • attachment means comprising several lines of adhesive filaments swirled into a spiral pattern is illustrated by the apparatus and methods shown in U.S. Patent 3,911 ,173 issued to Sprague, Jr. on October 7, 1975; U.S. Patent 4,785,996 issued to Ziecker, et al. on November 22, 1978; and U.S. Patent 4,842,666 issued to Werenicz on June 27, 1989.
  • the attachment means may comprise heat bonds, pressure bonds, ultrasonic bonds, dynamic mechanical bonds, or any other suitable attachment means or combinations of these attachment means as are known in the art.
  • Embodiments of the present invention are also contemplated wherein the absorbent core is not joined to the backsheet 52 , and/or the topsheet 54 in order to provide greater extensibility in the front waist region and the rear waist region.
  • the backsheet 52 comprises a breathable microporous film 53 and an outer sheet 55 which may comprise a nonwoven.
  • the microporous film 53 positions adjacent the absorbent core 66 such that the microporous film 53 faces the absorbent core 66.
  • another layer of material may be inserted between the absorbent core 66 and the microporous film 53.
  • the nonwoven sheet 55 positions outwardly of the diaper.
  • the nonwoven outer sheet 55 may be joined with at least a portion of the garment-facing surface of the microporous film 53.
  • the backsheet 52 may include any materials joined to the microporous film 53 such as woven webs, foams, scrims, loose fibers, or any other material or combination of materials known in the art that will give the diaper a cloth-like look and/or feel and is at a minimum air permeable.
  • the nonwoven sheet 55 may cover all or substantially all of the garment-facing surface of the microporous film 53, or may cover only discrete predetermined portions. In a preferred embodiment, the nonwoven web of the nonwoven sheet 55 covers all or substantially all of the microporous film 53 in order to provide the diaper with a cloth-like look and feel.
  • the nonwoven sheet 55 may provide the diaper with a low cost landing zone capable of engaging the hooks of a hook and loop type fastener. (Such a landing zone could be utilized as a portion of a primary fastening system or as a means for disposing of a soiled diaper.)
  • the nonwoven web comprised in the nonwoven sheet 55 may comprise natural fibers (e.g. cotton or wood fibers), or may comprise fibers of polyethylene, polypropylene, polyester, or any combination of such fibers. Further, the nonwoven may be carded, spunbond, meltblown or air-through bonded or have any other characteristic or be manufactured in any manner known in the art. Preferably, the nonwoven is comprised of sufficient thermoplastic material to allow for thermal bonding of the material to other components of the diaper.
  • An especially preferred nonwoven is a carded nonwoven made of 100% polypropylene fibers such as Sawabond 41 1 1 manufactured by Vliesstoftechnik Christian Heinrich Sandier GmbH & Co. KG, Germany.
  • the microporous film 53 may comprise any known material being moisture pervious and liquid impervious.
  • the microporous film 53 may comprise a breathable microporous film composed of a thermoplastic resin and inorganic fillers dispersed in the thermoplastic resin.
  • Suitable thermoplastic polymers include polyolefins such as polyethylenes, including liner low density polyethylene (LLDPE), low density polyethylene (LDPE), ultra low density polyethylene (ULDPE), high density polyethylene (HDPE), or polypropylene and blends thereof with the above and other materials.
  • thermoplastic polymers examples include, but are not limited to, polyester, polyurethanes, compostable or biodegradable polymers, thermoplastic elastomers, and metallocene catalyst-based polymers (e.g., INSITE® available from Dow Chemical
  • the inorganic material or filler is selected from the group consisting of calcium carbonate, clay and titanium dioxide, with the preferred inorganic filler being calcium carbonate.
  • the microporous film 53 may comprise polyethylene of from about
  • the inorganic filler and the thermoplastic polymer are blended together to form a homogeneous mixture in a suitable mixing extruder, or in a separate preliminary compounding step.
  • the mixture is then cast or blown into a film.
  • the obtained film is stretched at least in one direction to impart breathability on the substantially entire area of the film.
  • the step of stretching a film to impart breathability may be done at a different place prior to manufacturing process of absorbent articles. Alternatively, the step of stretching may be done at the same place, i.e., same manufacturing process, prior to assembling a breathable microporous film with other elements of absorbent articles. In any cases, the film is imparted breathability on the substantially entire area of the film before the resulting breathable microporous film is assembled with other elements of absorbent articles.
  • the microporous film of the present invention should have desirable properties that are beneficial in the processing of the film in connection with the manufacture of absorbent articles with registered graphics and in the use of absorbent articles.
  • the desirable properties of the microporous film of the present invention are web modulus of the microporous film, bending force value of the microporous film, and material modulus of the microporous film.
  • the microporous film may have other desirable physical properties as described below.
  • Web modulus of the microporous film is important to the stable operation of a registered graphics phasing system. As used herein, "web modulus" means the mechanical property defined as the slope of the straight line which is connected between 1% strain and 5% strain in a material's stress/strain curve.
  • Web modulus can be measured by the method described herein below.
  • the modulus determines the amount of tension required to force an adjustment in the phase position of the film during processing.
  • Microporous films of the present invention have a web modulus of not less than about 160gf/mm. While the upper limit of the web modulus of the microporous films may be determined arbitrarily by the skilled in the art, the web modulus of the microporous films may be not more than 510 gf/mm, preferably not more than 300 gf/mm.
  • the microporous films having a web modulus above do not cause significant variations of strain in the film or at least reduce the variation of the strain while the film is tensioned for being printed with graphic designs.
  • the microporous film of the present invention is desirable for a registered graphics phasing system which is controlled based on the signal from the registration mark on the film.
  • Bending force of the microporous film is important for providing consumers, i.e., caregiver and wearer, with softness and/or flexibility of the outer surface of the absorbent article.
  • "bending force” means the mechanical property defined as the slope of M-K curve shown in FIG. 13. M is bending momentum per unit width and K is curvature. Bending force can be measured by the method described herein below.
  • the microporous film of the present invention may have an average bending force value of not more than about 3.3 mgf • cm 2 /cm, preferably not more than about 3.0 mgf • cm 2 /cm, and more preferably not more than about 2.7 mgf • cm 2 /cm. The lower limit of the bending force may be determined arbitrarily by the skilled in the art.
  • material modulus means the mechanical property defined as the tensile stress at 3 % strain per the unit cross sectional area of the film. Material modulus can be determined by the method described herein below.
  • Material modulus of the microporous film of the present invention is not less than 310 gf/mm 2 at 3 % strain, preferably not less than 330 gf/mm 2 at 3 % strain, more preferably not less than 350 gf/mm 2 at 3 % strain.
  • Such material modulus of the microporous film allows the microporous film to maintain the range of the web modulus above while decreasing caliper or basis weight of the film, i.e., providing desirable bending force for softness and/or flexibility.
  • the desirable range of material modulus can be achieved by, e.g., adjusting the molecular structure of the thermoplastic resin of the microporous film.
  • such an adjustment may be achieved by increasing the number and/or size of crystallization (e.g. lamella structure) in the polymer of the thermoplastic resin.
  • crystallization e.g. lamella structure
  • the adjustment may be also achieved by arranging the orientation of the polymer. Aligning the orientation of the polymer leads to higher material modulus in the direction. More concretely, higher crystallization and more lamella structure tend to promote the polymer's orientation in the machine direction when the film is being stretched in the film making process.
  • both the side chains of LLDPE (linear low density polyethylene) and modifier (normally, lower molecular weight polymer) in the resin are obstructers of the crystallization and lamella structure of the polymer. Therefore, it is possible to control such molecular structure of the resin by selecting the resin formula.
  • Basis weight refers to the weight of one square meter of planar web material. Generally, higher basis weight leads to larger web modulus which has a good effect on the process feasibility of the film, but it also leads to less softness and/or flexibility of the film. Exemplary basis weight herein is preferably not more than 35 grams per square meter (gsm). While the lower limit of the basis weight of the microporous films may be determined arbitrarily by the skilled in the art, the basis weight of the microporous films may be not less than 15 gsm.
  • Film caliper refers to the thickness of the film. Exemplary film caliper is preferably 45 ⁇ m. While the lower limit of the film caliper of the microporous films may be determined arbitrarily by the skilled in the art, the film caliper of the microporous films may be not less than 15 ⁇ m.
  • the films of the present invention also preferably have other desirable properties that are beneficial in the processing of the film in connection with the manufacture of absorbent articles. Although it will be understood by those of skill in the art that the films of the present invention have many uses, for purposes of illustration the following description will focus upon use of the film as a backsheet for a disposable diaper.
  • Suitable microporous film is supplied from Mitsui Chemical, Japan under the name of Espoir PG-P2 25gsm.
  • This film has web modulus of 233 gf/mm, material modulus of 390 gf/mm 2 at 3% strain, and bending force of 2.5 mgf • cm 2 /cm.
  • the film also has a basis weight of 25 gsm, and a caliper of 23 mm.
  • Such a film is preferable as a microporous film with a registration mark for a registered graphics phasing system.
  • Web modulus and material modulus of a test web are measured as follows.
  • the instrument (Tensile tester : Instron 5564 / MTS, Testworks ver.3.06) is set up to pull the test samples under the following condition.
  • the measurement is made according to the following procedure.
  • the measurement of caliper of a test web is made by using the caliper gauge ⁇ G-225', made by Ono Sokki, Japan. The measurement is made under the conditions of 7.0 gf/cm 2 of pressure with the round contact plate which area is 400 ⁇ mm 2 , according to the following procedure.
  • Tensile stress at 3% strain is measured with the test method above. This value divided by cross section area is calculated and reported as material modulus for each specimen.
  • a bending tester KES-FB2, Kato Tech. Co Ltd., is used to measure bending force.
  • the effective dimension for the measurement is 20 cm in length and 1.0 cm in width (rectangular).
  • the specimen is bent as shown in FIGS. 11 and 12.
  • the bending rate is 0.5 cm- 1/sec.
  • the bending hysteresis curve as shown in FIG. 13 is obtained by the measurement.
  • the horizontal axis shows the curvatures K cm-1 and the vertical axis shows the bending moment per unit width M (gf » cm/cm).
  • the bending force is calculated as follows:
  • the average bending force is the mean value of the above bending force obtained from the measurements about the MD and CD directions of the specimen.

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  • 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)
  • Manufacturing & Machinery (AREA)
  • Dermatology (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

L"invention concerne un article absorbant comprenant une couche supérieure, une couche inférieure, et une couche centrale absorbante placée entre les deux couches. Ledit film microporeux est doté d"un repère de positionnement permettant de traiter des graphismes enregistrés. Il possède un module de bande égal ou supérieur à 160 gf/mm et une force de flexion inférieure ou égale à 3,3 mgf *cm2/cm. Il comprend également un matériau dont le module est égal ou supérieur à 310 gf/mm2 à 3 % de déformation.
PCT/US2000/018725 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement WO2002003900A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP00950310A EP1299061A1 (fr) 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement
MXPA02012871A MXPA02012871A (es) 2000-07-10 2000-07-10 Articulo absorbente que comprende pelicula microporosa con marca de coincidencia.
JP2002508359A JP2004513680A (ja) 2000-07-10 2000-07-10 位置合わせマークがある微小多孔性フィルムを具備する吸収性物品
PCT/US2000/018725 WO2002003900A1 (fr) 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement
AU2000263431A AU2000263431A1 (en) 2000-07-10 2000-07-10 Absorbent article comprising microprous film with registration mark
CA002416255A CA2416255A1 (fr) 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement
US10/338,394 US20030105443A1 (en) 2000-07-10 2003-01-08 Absorbent article comprising mircroporous film with registration mark

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/018725 WO2002003900A1 (fr) 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/338,394 Continuation US20030105443A1 (en) 2000-07-10 2003-01-08 Absorbent article comprising mircroporous film with registration mark

Publications (1)

Publication Number Publication Date
WO2002003900A1 true WO2002003900A1 (fr) 2002-01-17

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PCT/US2000/018725 WO2002003900A1 (fr) 2000-07-10 2000-07-10 Article absorbant comprenant un film microporeux a repere de positionnement

Country Status (6)

Country Link
EP (1) EP1299061A1 (fr)
JP (1) JP2004513680A (fr)
AU (1) AU2000263431A1 (fr)
CA (1) CA2416255A1 (fr)
MX (1) MXPA02012871A (fr)
WO (1) WO2002003900A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210758A1 (de) * 2002-03-12 2003-10-02 Richard Klinghammer Windel für Säuglinge oder Kleinkinder mit mindestens einem bedruckbaren Flächenbereich
WO2003103553A1 (fr) * 2002-06-07 2003-12-18 Kimberly-Clark Worldwide, Inc. Composants d'articles absorbants jetables comprenant des blocs imprimes de contraste
WO2003103552A1 (fr) * 2002-06-07 2003-12-18 Kimberly-Clark Worldwide, Inc. Composants d'articles absorbants jetables pourvus de materiaux de detection en continu
WO2005053590A1 (fr) * 2003-12-02 2005-06-16 Daio Paper Corporation Article absorbant
WO2007125506A2 (fr) * 2006-04-28 2007-11-08 The Procter & Gamble Company Bandes polymères contenant des nanoparticules
WO2007125502A2 (fr) * 2006-04-28 2007-11-08 The Procter & Gamble Company Bandes polymères contenant des nanoparticules
WO2017083455A1 (fr) 2015-11-11 2017-05-18 The Procter & Gamble Company Procédés et appareils d'alignement de substrat dans des chaînes de transformation d'article absorbant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE408721T1 (de) * 2005-02-12 2008-10-15 Nordenia Deutschland Gronau Verbundstoffelement für einen klettverschluss, insbesondere einen windelverschluss, und verfahren zu seiner herstellung
JP5383528B2 (ja) * 2010-01-19 2014-01-08 ユニ・チャーム株式会社 使い捨て着用物品
JP5631165B2 (ja) * 2010-11-17 2014-11-26 花王株式会社 吸収性物品
JP6860295B2 (ja) * 2016-05-17 2021-04-14 大王製紙株式会社 吸収性物品

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EP0554911A1 (fr) * 1992-02-07 1993-08-11 Kimberly-Clark Corporation Procédé et dispositif pour appliquer sélectivement des segments prédéterminés de matériau en bande et article fabriqué
WO1999032164A1 (fr) * 1997-12-19 1999-07-01 The Procter & Gamble Company Articles absorbants jetables comprenant des films polymeres microporeux portant des motifs graphiques enregistres
WO1999060973A1 (fr) * 1998-05-28 1999-12-02 The Procter & Gamble Company Couche de fond de type vetement et imper-respirante presentant des motifs multicolores conçue pour un article absorbant jetable
US6033502A (en) * 1996-11-13 2000-03-07 Kimberly-Clark Worldwide, Inc. Process and apparatus for registering continuously moving stretchable layers

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
US4769283A (en) * 1986-01-31 1988-09-06 Minnesota Mining And Manufacturing Company Pressure-sensitive adhesive tape
JP3155351B2 (ja) * 1992-06-19 2001-04-09 花王株式会社 多孔性シート及びその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554911A1 (fr) * 1992-02-07 1993-08-11 Kimberly-Clark Corporation Procédé et dispositif pour appliquer sélectivement des segments prédéterminés de matériau en bande et article fabriqué
US6033502A (en) * 1996-11-13 2000-03-07 Kimberly-Clark Worldwide, Inc. Process and apparatus for registering continuously moving stretchable layers
WO1999032164A1 (fr) * 1997-12-19 1999-07-01 The Procter & Gamble Company Articles absorbants jetables comprenant des films polymeres microporeux portant des motifs graphiques enregistres
WO1999060973A1 (fr) * 1998-05-28 1999-12-02 The Procter & Gamble Company Couche de fond de type vetement et imper-respirante presentant des motifs multicolores conçue pour un article absorbant jetable

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210758A1 (de) * 2002-03-12 2003-10-02 Richard Klinghammer Windel für Säuglinge oder Kleinkinder mit mindestens einem bedruckbaren Flächenbereich
WO2003103553A1 (fr) * 2002-06-07 2003-12-18 Kimberly-Clark Worldwide, Inc. Composants d'articles absorbants jetables comprenant des blocs imprimes de contraste
WO2003103552A1 (fr) * 2002-06-07 2003-12-18 Kimberly-Clark Worldwide, Inc. Composants d'articles absorbants jetables pourvus de materiaux de detection en continu
US7851666B2 (en) 2002-06-07 2010-12-14 Kimberly-Clark Worldwide, Inc. Components of articles including contrasting printed blocks
US7919668B2 (en) 2002-06-07 2011-04-05 Kimberly-Clark Worldwide, Inc. Components of articles including continuous detector materials
WO2005053590A1 (fr) * 2003-12-02 2005-06-16 Daio Paper Corporation Article absorbant
CN100512786C (zh) * 2003-12-02 2009-07-15 大王制纸株式会社 吸收性物品
WO2007125506A2 (fr) * 2006-04-28 2007-11-08 The Procter & Gamble Company Bandes polymères contenant des nanoparticules
WO2007125502A2 (fr) * 2006-04-28 2007-11-08 The Procter & Gamble Company Bandes polymères contenant des nanoparticules
WO2007125502A3 (fr) * 2006-04-28 2008-01-31 Procter & Gamble Bandes polymères contenant des nanoparticules
WO2007125506A3 (fr) * 2006-04-28 2008-01-31 Procter & Gamble Bandes polymères contenant des nanoparticules
WO2017083455A1 (fr) 2015-11-11 2017-05-18 The Procter & Gamble Company Procédés et appareils d'alignement de substrat dans des chaînes de transformation d'article absorbant

Also Published As

Publication number Publication date
MXPA02012871A (es) 2003-05-15
CA2416255A1 (fr) 2002-01-17
EP1299061A1 (fr) 2003-04-09
JP2004513680A (ja) 2004-05-13
AU2000263431A1 (en) 2002-01-21

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