WO2018167882A1 - 積層不織布及びその製造方法並びに吸収性物品及び吸汗シート - Google Patents

積層不織布及びその製造方法並びに吸収性物品及び吸汗シート Download PDF

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Publication number
WO2018167882A1
WO2018167882A1 PCT/JP2017/010465 JP2017010465W WO2018167882A1 WO 2018167882 A1 WO2018167882 A1 WO 2018167882A1 JP 2017010465 W JP2017010465 W JP 2017010465W WO 2018167882 A1 WO2018167882 A1 WO 2018167882A1
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WIPO (PCT)
Prior art keywords
nonwoven fabric
layer
fiber
laminated nonwoven
laminated
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PCT/JP2017/010465
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English (en)
French (fr)
Japanese (ja)
Inventor
優子 福田
小林　秀行
真行 湊崎
奥田　泰之
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花王株式会社
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Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to RU2019131470A priority Critical patent/RU2723405C1/ru
Priority to JP2019505594A priority patent/JP6539007B2/ja
Priority to PCT/JP2017/010465 priority patent/WO2018167882A1/ja
Priority to CN201780087145.1A priority patent/CN110325679B/zh
Publication of WO2018167882A1 publication Critical patent/WO2018167882A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

Definitions

  • the present invention relates to a laminated nonwoven fabric having a laminated structure in which a plurality of nonwoven fabrics are laminated, and an absorbent article and a sweat absorbing sheet using the laminated nonwoven fabric.
  • Patent Document 1 describes that a sweat-absorbing sheet capable of absorbing a wearer's sweat is disposed in a portion of the disposable diaper that comes into contact with the skin of the wearer. It is described to use a laminated nonwoven fabric having a laminated structure with a conductive nonwoven fabric and bonded to each other at a large number of heat-sealed portions in which both nonwoven fabrics are recessed in a concave shape, and the laminated nonwoven fabric wears the hydrophobic nonwoven fabric. It is described that it is arranged toward the person's skin side.
  • Patent Document 2 describes a unidirectional water-conducting nonwoven fabric sheet that has liquid permeability from a certain surface direction and does not have liquid permeability from the opposite direction as a laminated nonwoven fabric suitable as a constituent member of an absorbent article.
  • at least one layer is a nonwoven fabric that has been hydrophilized and the rest is a nonwoven fabric that has not been hydrophilized.
  • Patent Document 2 describes a method for producing a laminated nonwoven fabric by superimposing a plurality of nonwoven fabrics and performing a heat-sealing treatment with a hot embossing roll.
  • a method of directly depositing long fibers having a predetermined fineness and then performing an entanglement process by means such as needle punching, water jet, ultrasonic sealing, or a thermal fusing process using a hot embossing roll is described. Has been.
  • Patent Document 3 as a functional filter used for extraction of coffee or tea, an inner layer made of a hydrophobic ultrafine fiber nonwoven fabric and an outer layer made of a synthetic fiber nonwoven fabric to which a hydrophilic agent is attached include an adhesive or a heat A laminated nonwoven fabric partially bonded by embossing is described.
  • the present invention is a laminated nonwoven fabric having a laminated structure of fiber layers containing thermoplastic fibers.
  • the laminated structure has a first surface that is one surface of the laminated nonwoven fabric and a second surface that is the other surface, and the first surface is composed of a hydrophilic first layer, A hydrophobic second layer is disposed on the second surface side of the layer.
  • the laminated structure has an interlayer fusion part in which the thickness is smaller than that of the peripheral part and the layers constituting the laminated structure are fused to each other.
  • the first layer further has an inter-fiber fusion part in which the thickness is smaller than that of the peripheral part and the constituent fibers of the first layer are fused together.
  • the present invention is a method for producing a laminated nonwoven fabric, which has a laminated structure of fiber layers containing thermoplastic fibers, and each layer constituting the laminated structure is fused to each other at an interlayer fusion part.
  • the method for producing a laminated nonwoven fabric of the present invention transports a hydrophilic base nonwoven fabric having a thickness smaller than that of the peripheral portion and having an inter-fiber fused portion in which constituent fibers are fused to each other, and the base nonwoven fabric being conveyed.
  • the present invention is an absorbent article comprising a laminated nonwoven fabric having a laminated structure of fiber layers containing thermoplastic fibers.
  • the laminated structure has a first surface that is one surface of the laminated nonwoven fabric and a second surface that is the other surface, and the first surface is composed of a hydrophilic first layer, A hydrophobic second layer is disposed on the second surface side of the layer.
  • the laminated structure has an interlayer fusion part in which the thickness is smaller than that of the peripheral part and the layers constituting the laminated structure are fused to each other.
  • the first layer further has an inter-fiber fusion part in which the thickness is smaller than that of the peripheral part and the constituent fibers of the first layer are fused together.
  • the laminated nonwoven fabric is arranged with the second surface facing the wearer's skin.
  • this invention has the laminated structure of the fiber layer containing a thermoplastic fiber, has a 1st surface and the 2nd surface located on the opposite side, This 2nd surface is on a wearer's skin side. It is a sweat-absorbing sheet used for
  • the first surface is composed of a hydrophilic first layer, and a hydrophobic second layer is disposed on the second surface side of the first layer.
  • the laminated structure has an interlayer fusion part in which the thickness is smaller than that of the peripheral part and the layers constituting the laminated structure are fused to each other.
  • the first layer further has an inter-fiber fusion part in which the thickness is smaller than that of the peripheral part and the constituent fibers of the first layer are fused together.
  • Drawing 1 is a sectional view showing typically the section which meets the thickness direction of one embodiment of the lamination nonwoven fabric of the present invention.
  • 2 (a) to 2 (d) are diagrams each schematically showing a pattern of an interlayer fusion bonding portion according to the present invention.
  • FIGS. 3 (a) to 3 (h) are diagrams each schematically showing a pattern of an interfiber fusion portion according to the present invention.
  • 4 (a) to 4 (d) are diagrams schematically showing patterns of fusion parts (interlayer fusion parts and inter-fiber fusion parts) on the first surface of the laminated nonwoven fabric of the present invention.
  • FIG. 5 is a schematic view of an embodiment of the method for producing a laminated nonwoven fabric of the present invention.
  • FIG. 5 is a schematic view of an embodiment of the method for producing a laminated nonwoven fabric of the present invention.
  • FIG. 6 is a schematic perspective view of a pants-type disposable diaper that is an embodiment of the absorbent article of the present invention.
  • FIG. 7 is a developed plan view schematically showing the skin contact surface side (inner surface side) in the developed and extended state of the diaper shown in FIG. 6.
  • FIG. 8 is a longitudinal sectional view schematically showing a cross section taken along line II of FIG.
  • a laminated nonwoven fabric obtained by laminating a plurality of nonwoven fabrics and integrating them by heat embossing is difficult to reduce the basis weight of each layer constituting the laminated structure. It is difficult to reduce the basis weight of the hydrophobic layer. Therefore, such a laminated nonwoven fabric has a high basis weight and a high rigidity as a whole, and may cause a decrease in wearing feeling when used as a constituent member of an absorbent article. In the case where it is arranged closest to the wearer's skin, it is poor in absorbability of body fluids such as sweat and urine.
  • fibers are successively dropped and deposited from a plurality of spinning heads arranged intermittently in the machine direction (MD), and downstream of the spinning head located at the most downstream of the MD.
  • MD machine direction
  • a method is known in which these fiber deposits are subjected to heat embossing to be integrated. Since such a laminated nonwoven fabric by so-called direct spinning has a relatively low basis weight and low rigidity, when the hydrophobic layer is disposed at a position closest to the skin of the wearer, an embossed portion in the hydrophobic layer is provided.
  • the constituent fibers of the hydrophilic layer adjacent to the hydrophobic layer are densely present around the embossed portion, and the thickness of the hydrophobic layer is relatively Since it is thin, body fluid tends to collect around the embossed portion, and liquid return tends to occur.
  • an object of the present invention relates to providing a laminated nonwoven fabric excellent in the absorption performance of body fluids such as sweat and urine, a method for producing the same, an absorbent article and a sweat absorbing sheet.
  • FIG. 1 schematically shows a cross section along the thickness direction Z of a laminated nonwoven fabric 10 that is an embodiment of the laminated nonwoven fabric of the present invention.
  • the laminated nonwoven fabric 10 has a laminated structure 13 of fiber layers containing thermoplastic fibers, and the fiber layer is typically a nonwoven fabric, that is, a single-layer nonwoven fabric (eg, spunbond nonwoven fabric) or a laminated nonwoven fabric (eg, SMS nonwoven fabric).
  • Each layer constituting The laminated structure 13 is a first surface 10a that is one surface (outer surface) of the laminated nonwoven fabric 10 and a second surface (outer surface) of the laminated nonwoven fabric 10 that is located on the opposite side of the first surface 10a.
  • Surface 10b is a first surface 10a that is one surface (outer surface) of the laminated nonwoven fabric 10 and a second surface (outer surface) of the laminated nonwoven fabric 10 that is located on the opposite side of the first surface 10a.
  • the laminated structure 13 has a hydrophilicity gradient in the thickness direction Z. That is, in the laminated structure 13, the first surface 10 a is composed of the hydrophilic first layer 11 including the hydrophilic fibers 14, and the hydrophobic surface 15 including the hydrophobic fibers 15 on the second surface 10 b side of the first layer 11.
  • the second layer 12 is arranged, and with this configuration, the laminated structure 13 is given a hydrophilicity gradient that “the first surface 10a side is relatively more hydrophilic than the second surface 10b side”. Further, the hydrophilic first layer 11 is provided with a hydrophilicity gradient that “the first surface 10a side is relatively low in hydrophilicity and the second surface 10b side is relatively high in hydrophilicity”. .
  • the laminated structure 13 is a two-layer structure of a hydrophilic first layer 11 and a hydrophobic second layer 12, and the first surface 10 a is formed from the first layer 11.
  • the second surface 10b is formed of the second layer 12 and is hydrophobic.
  • “the number of layers of the laminated structure 13 is two” means the total number of layers of the two layers (the first layer 11 and the second layer 12) having different forms or functions. In this sense, the number of fiber layers (nonwoven fabrics) does not always match. That is, the first layer 11 and the second layer 12 can be not only a single layer non-woven fabric but also a multi-layer non-woven fabric (for example, SMS non-woven fabric) as described later.
  • each of the first layer 11 and the second layer 12 may have two or more layers.
  • the hydrophilicity of the fiber layer is determined based on the contact angle with water measured by the following method. If the contact angle is less than 90 degrees, the hydrophilicity is 90. If it is greater than or equal to degrees, it is hydrophobic. The smaller the contact angle with water measured by the following method, the higher the hydrophilicity (lower hydrophobicity), and the higher the contact angle, the lower the hydrophilicity (highly hydrophobic).
  • the hydrophilic first layer 11 has a contact angle measured by the following method of less than 90 degrees
  • the hydrophobic second layer 12 has a contact angle measured by the following method. Is 90 degrees or more.
  • the measurement sample is set on the measurement stage of the measurement apparatus so that the surface to be measured is in an upward state and can be observed from the CD direction of the measurement sample. Then, a 3 ⁇ L droplet of ion-exchanged water is attached to the measurement target surface of the measurement sample set on the measurement stage, and an image of the droplet is recorded and taken into the measurement apparatus. Of the recorded images, 10 images with clear edges or one end in the CD direction of the droplet are selected, the contact angle of the droplet is measured for each of the 10 images, and the average value of the contact angles is measured. Is the contact angle of the fiber layer (nonwoven fabric) to be measured.
  • the measurement environment is 20 ° C./50% RH.
  • the first layer 11 is mainly composed of hydrophilic fibers 14 and is therefore a hydrophilic layer.
  • the second layer 12 is mainly composed of the hydrophobic fibers 15 and is therefore a hydrophobic layer.
  • the first layer 11 contains at least 50% by mass or more of the hydrophilic fibers 14, and the content of the hydrophilic fibers 14 may be 100% by mass with respect to the total mass of the first layer 11.
  • the second layer 12 may contain at least 70% by mass of the hydrophobic fibers 15 and the content of the hydrophobic fibers 15 may be 100% by mass with respect to the total mass of the second layer 12.
  • the hydrophilicity of the fiber is determined based on the contact angle with water measured by the following method. If the contact angle is less than 90 degrees, the fiber is hydrophilic, and if the contact angle is 90 degrees or more, the fiber is hydrophobic. is there. The smaller the contact angle with water measured by the following method, the higher the hydrophilicity (lower hydrophobicity), and the higher the contact angle, the lower the hydrophilicity (highly hydrophobic).
  • the hydrophilic fibers 14 constituting the first layer 11 of the laminated structure 13 have a contact angle measured by the following method of less than 90 degrees, and the hydrophobic fibers 15 constituting the second layer 12 are The contact angle measured by the following method is 90 degrees or more.
  • ⁇ Measurement method of contact angle> A fiber is taken out from the measurement target (laminated nonwoven fabric), and the contact angle of water with the fiber is measured.
  • the take-out site of the fiber in the laminated nonwoven fabric to be measured is the outermost surface (outermost surface) of each of the first surface and the second surface, and the first surface in the laminated nonwoven fabric. The region is sandwiched between the second surface.
  • an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Deionized water is used to measure the contact angle.
  • the amount of liquid ejected from an ink jet type water droplet ejection section (manufactured by Cluster Technology, Inc., pulse injector CTC-25 having a pore diameter of 25 ⁇ m) is set to 15 picoliters, and water droplets are dripped just above the fibers.
  • the state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera.
  • the recording device is preferably a personal computer incorporating a high-speed capture device from the viewpoint of image analysis later. In this measurement, an image is recorded every 17 msec.
  • the first image of water droplets on the fiber is attached to the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is ⁇ / 2 method, image processing algorithm Is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected)), and the angle between the surface of the water droplet that touches the air and the fiber is calculated, A corner.
  • the fiber taken out from the object to be measured is cut into a fiber length of 1 mm, and the fiber is placed on a sample table of a contact angle meter and kept horizontal. Two different contact angles are measured per fiber.
  • N 5 contact angles are measured to one decimal place, and a total of 10 measured values (rounded to the second decimal place) is defined as the contact angle of the fiber with water.
  • the measurement environment is a room temperature of 22 ⁇ 2 ° C. and a humidity of 65 ⁇ 2% RH. It means that hydrophilicity is so high that the value of such a contact angle is small.
  • the constituent member including the measurement sample is an adhesive
  • the constituent member including the measurement sample is an adhesive
  • the constituent member including the measurement sample is an adhesive
  • a method of directly collecting the measurement sample from the absorbent article can be employed.
  • the adhesive used for joining the component member to be measured and another component member is weakened by a cooling means such as cold spray.
  • a method of carefully removing the component to be measured and taking it out is preferable.
  • This extraction method is applied in the measurement according to the measurement object of the present invention, such as measurement of the interfiber distance and the fineness described later.
  • hydrophobic fiber 15 a hydrophobic thermoplastic fiber (heat-bonded fiber) can be used.
  • the material of the hydrophobic fiber 15 include hydrophobic thermoplastic resins such as polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid and polymethacrylic acid alkyl esters; Examples thereof include polyvinyl chloride and polyvinylidene chloride, and these can be used alone or in combination of two or more.
  • a hydrophilic thermoplastic fiber heat fusion fiber
  • an inherently hydrophilic thermoplastic fiber such as polyacrylonitrile fiber may be used.
  • a hydrophobic thermoplastic fiber that can be used as the hydrophobic fiber 15 may be subjected to a hydrophilic treatment, and one of these may be used alone or in combination of two or more.
  • hydrophilic treated thermoplastic fiber include, for example, a thermoplastic fiber kneaded with a hydrophilizing agent, a thermoplastic fiber with a hydrophilizing agent attached to the surface, and a thermoplastic fiber subjected to plasma treatment.
  • the hydrophilizing agent is not particularly limited as long as it is a general hydrophilizing agent used for hygiene products.
  • Each of the hydrophilic fiber 14 and the hydrophobic fiber 15 may be a single fiber made of one type of synthetic resin (thermoplastic resin), a blend polymer obtained by mixing two or more types of synthetic resins, or a composite fiber.
  • the composite fiber here is a synthetic fiber (thermoplastic fiber) obtained by compounding two or more types of synthetic resins (thermoplastic resins) having different components with a spinneret and simultaneously spinning, and each of the components is composed of fibers.
  • the form of the composite fiber includes a core-sheath type and a side-by-side type, and is not particularly limited.
  • the first layer 11 and the second layer 12 may each be a nonwoven fabric mainly composed of short fibers (short fiber nonwoven fabric), or a nonwoven fabric mainly composed of long fibers (long fiber nonwoven fabric).
  • “mainly” means that the proportion of short fibers or long fibers in the total mass of the nonwoven fabric is 70% by mass or more, and the proportion is usually 100% by mass.
  • the short fiber nonwoven fabric examples include an air-through nonwoven fabric, a spunlace nonwoven fabric, a needle punched nonwoven fabric, and a chemical bond nonwoven fabric, and the fiber length of the main constituent fibers (short fibers) of the nonwoven fabric is preferably 15 mm or more and 100 mm or less. is there.
  • long fiber means a fiber having a fiber length of 30 mm or more.
  • so-called continuous long fibers having a fiber length of 150 mm or more are preferable in that a long fiber nonwoven fabric having high breaking strength can be obtained.
  • the upper limit of the fiber length in the “long fiber” is not particularly limited.
  • the “long fiber nonwoven fabric” typically refers to a nonwoven fabric having a fiber assembly in which long fibers are intermittently fixed by a heat fusion part.
  • Examples of such a long fiber nonwoven fabric include a single layer nonwoven fabric such as a spunbond nonwoven fabric and a meltblown nonwoven fabric, or a laminated nonwoven fabric obtained by laminating a spunbond layer mainly composed of long fibers, a meltblown layer, a heat roll nonwoven fabric by a card method, and the like.
  • Examples of the laminated nonwoven fabric include spunbond-spunbond laminated nonwoven fabric (SS nonwoven fabric), spunbond-spunbond-spunbond laminated nonwoven fabric (SSS nonwoven fabric), and spunbond-meltblown-spunbond laminated nonwoven fabric (SMS).
  • SS nonwoven fabric spunbond-spunbond laminated nonwoven fabric
  • SSS nonwoven fabric spunbond-spunbond laminated nonwoven fabric
  • SMS spunbond-meltblown-spunbond laminated nonwoven fabric
  • Non-woven fabric spunbond-meltblown-meltblown-spunbond nonwoven fabric (SMMS nonwoven fabric), and the like.
  • the manufacturing method of the laminated nonwoven fabric of this invention mentioned later conveys the hydrophilic base nonwoven fabric finally used as the 1st layer 11, and the hydrophobicity obtained by spinning resin on the base nonwoven fabric in the conveyance
  • the first layer 11 is a short fiber nonwoven fabric or a long one.
  • the fiber non-woven fabric may be used
  • the second layer 12 including the hydrophobic fiber 15 directly spun is a long-fiber non-woven fabric. In general, long fiber nonwoven fabrics are superior in strength to short fiber nonwoven fabrics.
  • the laminated nonwoven fabric 10 has two types of “small-thickness fusion parts” in which the thickness is smaller than that of the peripheral part and the constituent fibers are fused to each other. That is, the laminated structure 13 has an interlayer fusion part 16 having a thickness smaller than that of the peripheral part and in which the layers constituting the laminated structure 13 are fused to each other, and the first layer 11 constituting the laminated structure 13. In addition to the interlayer fusion part 16, it further has an inter-fiber fusion part 17 having a thickness smaller than that of the peripheral part and in which the constituent fibers of the first layer 11 are fused to each other.
  • the constituent fibers of the layers constituting the laminated structure 13 are thermally fused together, and the layers are fused to each other. It is joined by.
  • the interlayer fusion part 16 is formed in the same pattern on both the first surface 10a and the second surface 10b, and only the first layer 11 is further formed on the first surface 10a.
  • the interfiber fusion part 17 formed in the above is formed in a predetermined pattern. Further, the small thickness fusion part has a higher density than the peripheral part.
  • the interlayer fusion part 16 and the inter-fiber fusion part 17 are consolidation parts in which the constituent fibers of the part are consolidated in the thickness direction. This consolidation is typically performed by heat, ultrasonic waves, and the like. It is carried out by embossing with a fusion promoting means for promoting the melting of the thermoplastic fibers as the constituent fibers, specifically, for example, heat sealing, ultrasonic sealing, or the like. When attention is paid to the manufacturing method in this way, the interlayer fusion part 16 and the interfiber fusion part 17 can also be referred to as an embossed part or a compressed part, respectively.
  • the interlayer fusion part 16 is a first surface from the second surface 10 b side of the precursor of the laminated structure 13 (a laminated body of the first layer 11 that is the base nonwoven fabric and the deposit of the hydrophobic fibers 15). It is formed by pressing toward the 10a side, and due to such a forming method, as shown in FIG. 1, it is recessed in a concave shape from the second surface 10b side to the first surface 10a side.
  • the inter-fiber fusion part 17 is formed by pressing the precursor of the first layer 11 (the web as the deposit of the hydrophilic fibers 14) from the first surface 10a side to the second surface 10b side, Due to such a forming method, as shown in FIG.
  • the first surface 10a side is recessed in a concave shape from the second surface 10b side.
  • a plurality of interlayer fusion portions 16 are scattered on each of the first surface 10a and the second surface 10b, and a plurality of inter-fiber fusion portions 17 are scattered on the first surface 10a.
  • the first surface 10a and the second surface 10b are not flat surfaces that do not substantially have unevenness but are uneven surfaces having unevenness.
  • the structural member that can contact the laminated nonwoven fabric 10 with the skin of the wearer in the absorbent article when used for (for example, a surface sheet or a sweat-absorbent sheet), a space is formed between the laminated nonwoven fabric 10 and the wearer's skin by arranging the laminated nonwoven fabric 10 so that the uneven surface is in contact with the wearer's skin.
  • moisture generated from body fluids such as excreted sweat and urine can be effectively dissipated through the space, the surface dry feeling of the laminated nonwoven fabric 10 is improved, which can lead to an improvement in the wearing feeling of the absorbent article. .
  • FIG. 2 illustrates the pattern (shape and arrangement in plan view) of the interlayer fusion part 16.
  • melting part 16 in the 1st surface 10a or the 2nd surface 10b is not restrict
  • 2 (a) to 2 (c) are patterns in which a plurality of interlayer fusion portions 16 having a predetermined shape in plan view are scattered in a plane direction (a direction perpendicular to the thickness direction of the laminated nonwoven fabric 10).
  • the planar view shape of the interlayer fusion bonding part 16 is an elliptical shape (long elliptical shape) in FIG.
  • FIG. 2D shows a pattern in which the interlayer fusion part 16 having a planar view line shape is arranged to extend in a predetermined direction. More specifically, a plurality of continuous linear interlayer fusion parts 16 are arranged. The layers are arranged so as to cross each other, and the interlayer fusion bonding part 16 as a whole forms a lattice pattern.
  • FIG. 3 illustrates a pattern of the inter-fiber fusion part 17.
  • the pattern of the interfiber fusion part 17 in the 1st surface 10a is not restrict
  • FIG. 3A to FIG. 3E are patterns in which a plurality of interfiber fusion portions 17 each having a predetermined shape in plan view are scattered in the plane direction.
  • 3 (a) and 3 (b) are elliptical shapes, FIG. 3 (c) is a circular shape, FIG. 3 (d) is a square shape or a rhombus shape, and FIG. In (e), it is a cross.
  • FIG. 3 (a) and 3 (b) are elliptical shapes
  • FIG. 3 (c) is a circular shape
  • FIG. 3 (d) is a square shape or a rhombus shape
  • the major axis directions of the plurality of interfiber fusion parts 17 having an elliptical shape in plan view coincide with each other, whereas in FIG. 3B, plural types of planes having different major axis directions are used.
  • the inter-fiber fusion parts 17 having an elliptical shape are scattered.
  • the planar view shape of the interfiber fusion portion 17 is, for example, a triangular shape, a polygonal shape of a pentagon or more in addition to the illustrated shape.
  • Star shape. 3 (f) to 3 (h) are patterns in which the inter-fiber fusion portions 17 having a planar view line shape are arranged so as to extend in a predetermined direction.
  • FIG. 3F a plurality of continuous linear interfiber fusion portions 17 are arranged so as to cross each other, and the interfiber fusion portions 17 as a whole form a lattice pattern.
  • FIG. 3G shows the lattice-shaped pattern of FIG. 3F in which the interfiber fusion part 17 is changed from a continuous linear shape to a discontinuous linear shape, that is, a relatively short line segment interfiber fusion part 17. Is a pattern that employs discontinuous lines (intermittent lines) that are intermittently arranged in a predetermined direction.
  • FIG. 3 (h) is another example of the pattern formed by the discontinuous line-shaped inter-fiber fusion portions 17 in FIG. 3 (g), and the inter-fiber fusion portions 17 are arranged in a honeycomb shape.
  • FIG. 4 illustrates a pattern of both fusion portions 16 and 17 on the first surface 10a of the laminated nonwoven fabric 10, which is a surface on which both the interlayer fusion portion 16 and the interfiber fusion portion 17 are formed.
  • melting parts 16 and 17 in the 1st surface 10a is not restrict
  • 4A is a combination of the dot-like pattern of the interlayer fusion part 16 in FIG. 2A and the pattern of the dot-like inter-fiber fusion part 17 in FIG. 3A.
  • 4 (b) is a combination of the pattern of the interstitial fused portion 16 shown in FIG.
  • c) is a combination of the pattern of the linear interlayer fusion part 16 in FIG. 2D and the pattern of the interstitial fiber fusion part 17 in FIG. 3C
  • FIG. FIG. 2C is a combination of the pattern of the dotted interlaminar fused portion 16 in FIG. 2C and the pattern of the dotted interfiber fused portion 17 in FIG.
  • the laminated nonwoven fabric 10 has a ratio of the total area of the interlayer fusion part 16 and the interfiber fusion part 17 of the surface to the area of each of the first surface 10a and the second surface 10b.
  • the area ratio of the fused portions of the respective surfaces that is, the ratio of the total area of the interlayer fused portion 16 and the interfiber fused portion 17 of the first surface 10a to the area of the first surface 10a is defined as the first area 10a.
  • the area ratio of the fusion part of the surface 10a, and the ratio of the total area of the interlayer fusion part 16 and the inter-fiber fusion part 17 of the second surface 10b to the area of the second surface 10b is the second surface 10b.
  • the first surface 10a has a larger fusion part area ratio than the second surface 10b (the fusion part area ratio of the first surface 10a> the fusion of the second surface 10b. It is characterized by the fact that there is a magnitude relationship called the area ratio of the wearing part).
  • the second surface 10b is basically a body fluid (aqueous liquid) such as sweat or urine because the second layer 12 forming the second surface 10b is hydrophobic including the hydrophobic fibers 15.
  • a body fluid aqueous liquid
  • the second layer 12 forming the second surface 10b is hydrophobic including the hydrophobic fibers 15.
  • the second layer 12 that is adjacent to the second layer 12 and has a higher degree of hydrophilicity in the interlayer fusion bonding portion 16 and the periphery thereof on the second surface 10b.
  • the hydrophilic fibers 14 of the first layer 11 are present relatively densely, the hydrophilicity is high (the contact angle measured by the above method is small) compared to other parts of the second surface 10b, and therefore On the second surface 10b, body fluid can preferentially adhere to the interlayer fusion bonding part 16 and its surroundings.
  • the laminated structure 13 has a hydrophilicity gradient in the thickness direction Z that “the first surface 10a side is relatively more hydrophilic than the second surface 10b side”. Is excellent in liquid absorption from the second surface 10b inward in the thickness direction Z and has a strong capillary force.
  • the interstitial fusion part 16 on the second surface 10b and the body fluid adhering to the periphery thereof are quickly drawn into the laminated nonwoven fabric 10 mainly through the peripheral part of the inter-layer fusion part 16 and the vicinity thereof.
  • the hydrophilic first layer 11 has a hydrophilicity gradient that “the first surface 10a side is relatively low in hydrophilicity and the second surface 10b side is relatively high in hydrophilicity”
  • the laminated nonwoven fabric 10 Is absorbed and held in the hydrophilic first layer 11 inside the thickness direction Z while being diffused in the surface direction (direction perpendicular to the thickness direction Z).
  • the liquid drawing-in part is mainly “the peripheral part of the interlayer fusion part 16 and its vicinity”.
  • the part other than the center part in the interlayer fusion part 16, that is, the peripheral part of the interlayer fusion part 16 And the vicinity thereof (around the interlayer fusion part 16) means that the fiber form is maintained without forming a film, so that the peripheral part of the interlayer fusion part 16 and the vicinity thereof draw in the liquid on the second surface 10b. Part.
  • the contact angle of the constituent fibers (hydrophobic fibers 15) of the second layer 12 is larger than that of the constituent fibers (hydrophilic fibers 14) of the first layer 11.
  • it is preferably 95 degrees or more, more preferably 100 degrees or more, and preferably 150 degrees or less, more preferably 130 degrees or less.
  • the contact angle of the constituent fiber (hydrophilic fiber 14) of the first layer 11 is smaller than that of the constituent fiber (hydrophobic fiber 15) of the second layer 12, preferably 15 degrees or more, Preferably it is 20 degrees or more, and preferably 88 degrees or less, more preferably 85 degrees or less.
  • the hydrophilicity of the constituent fibers can be adjusted by appropriately adjusting the degree of hydrophilic treatment of the thermoplastic fibers, which are the main constituent fibers of the laminated nonwoven fabric 10, for example, the type and content of the hydrophilizing agent.
  • the interlayer fusion part 16 is an important part in which the peripheral part and the vicinity thereof become a liquid drawing part when absorbing liquid from the hydrophobic second surface 10b.
  • the laminated nonwoven fabric 10 is compressed in the thickness direction after liquid absorption due to the hydrophobic second layer 12 and the hydrophilic first layer 11 being joined at the portion 16 (for example, the laminated nonwoven fabric 10 Is used as a constituent member of an absorbent article with the second surface 10b facing the wearer's skin side, when the wearer's body pressure is applied to the laminated nonwoven fabric 10), the first layer 11 is absorbed and retained.
  • the fusion area ratio of the first surface 10a (the former) and the fusion of the second surface 10b is preferably 1.3 or more as the former / the latter. More preferably, it is 1.4 or more, and preferably 3.0 or less, more preferably 2.5 or less. If such a ratio is too small, it is difficult to obtain the liquid return preventing property. Conversely, if it is too large, the amount of liquid that can be absorbed and retained by the hydrophilic first layer 11 may be reduced.
  • both the fusion parts 16 and 17 may have the same pattern, but the above-described effects can be ensured. From the viewpoint of achieving the above, it is preferable that the patterns of the fused portions 16 and 17 are different from each other. More specifically, the interlayer fusion part 16 and the interfiber fusion part 17 include an arrangement pattern, a planar view shape of the fusion part alone, an area of the fusion part alone, a distance between the fusion parts (between the fusion parts). It is preferable that at least two of the shortest distances D16 and D17 (see FIG. 1) and pitches P16 and P17 (see FIG. 1) are different.
  • the distances D16 and D17 between the fusion parts mean an interval between two fusion parts (interlayer fusion part 16 or inter-fiber fusion part 17) adjacent in the surface direction of the laminated nonwoven fabric 10, and the pitch.
  • P16 and P17 mean the distance between the centers of the two fused parts in plan view.
  • Both the interlayer fusion part 16 and the interfiber fusion part 17 are high density fusion parts in which the constituent fibers are fused to each other at a higher density than the peripheral part, and depending on the pressure heating conditions at the time of formation, etc. Although the fiber form of the thermoplastic fiber as the constituent fiber may be lost, it may be formed into a film. From the viewpoint of ensuring the above-described effects, the inter-fiber fusion portion 17 is provided with interlayer fusion. It is preferable that the fiber form of the constituent fibers is maintained as compared with the wearing part 16.
  • the constituent fibers of the interlayer fusion portion 16 are formed into a film, whereas the constituent fibers of the interfiber fusion portion 17 are maintained in a fiber form and are not formed into a film. Since the fiber form of the constituent fibers of the inter-fiber fusion part 17 is relatively maintained, the hydrophilic fibers 14 are present at a high density in the inter-fiber fusion part 17 in which the fiber form is maintained. As a result, the capillary pressure is high, and therefore, the inter-fiber fused portion 17 and the liquid holding performance around it can be further improved.
  • the fiber form of the constituent fibers in the fusion parts 16 and 17 mainly depends on the embossing conditions when the fusion parts 16 and 17 are formed. If the heating and pressing conditions during the embossing are relatively weak, the structure The fiber form of the fiber is easily maintained.
  • the peripheral edge portion of the interlayer fusion bonding portion 16 and the vicinity thereof are portions that become the drawing portion of the liquid when absorbing the liquid from the second surface 10b, and therefore the viewpoint of improving the liquid absorbability of the laminated nonwoven fabric 10 From the above, it is preferable that the second surface 10b has an inter-layer fusion part dispersion arrangement region in which a plurality of inter-layer fusion parts 16 are scattered in the surface direction.
  • the laminated nonwoven fabric 10 is used as a sweat-absorbing sheet capable of absorbing sweat, the absorbability of sweat can be further improved if the second surface 10b has the inter-layer fusion part dispersed arrangement region. Therefore, it is preferable.
  • the whole area of the second surface 10b may be the interlayer fusion part dispersion arrangement region, or only a part of the second surface 10b may be the interlayer fusion part dispersion arrangement region.
  • the ratio of the area of the inter-layer fusion part dispersed arrangement region to the total area of the second surface 10b is preferably 70% or more, and more preferably 80% or more.
  • the interlayer fusion part 16 in the interlayer fusion part dispersion arrangement region when a circle with a radius of 2 mm is virtually provided at an arbitrary position of the interlayer fusion part dispersion arrangement region of the second surface 10b, It is preferable that a part or all of at least one interlayer fusion part 16 is included in the virtual circle.
  • the meaning of “when a circle having a radius of 2 mm is virtually provided at an arbitrary position includes at least one interlayer fusion part 16 within the virtual circle” means “the first When ten imaginary circles are provided in the inter-layer fusion part dispersed arrangement region on the two surfaces 10b, the interlayer fusion part 16 is not included at all in one or two of the imaginary circles.
  • the remaining eight virtual circles may include at least one part or all of the interlayer fusion part 16 ”.
  • the virtual circle assumes a sweat secretion site (sweat glands) scattered on the human skin surface, and the laminated nonwoven fabric 10 can absorb sweat more efficiently by having the above-described configuration.
  • the radius of the imaginary circle is 1.5 mm, it is more effective if the interlayer fusion part 16 is arranged so as to satisfy the above.
  • peripheral edge portion of the interlayer fusion portion 16 and the vicinity thereof are liquid drawing portions on the second surface 10b, a certain number is required to ensure practically sufficient liquid absorbability, that is, interlayer fusion.
  • the peripheral length of the portion 16 has a certain length or more, it is not preferable that the area of the interlayer fusion portion 16 itself is too large, and the interlayer fusion portion 16 exists excessively on the second surface 10b. Then, since not only the hydrophobic second layer 12 but also the hydrophilic first layer 11 are fused together in the interlayer fusion part 16, there is a possibility that the amount of liquid that can be absorbed and retained by the first layer 11 may be reduced. is there.
  • the total area of the interlayer fusion part 16 with respect to the area of the second surface 10b (if a plurality of interlayer fusion parts 16 are formed on the second surface 10b, the area of the plurality of interlayer fusion parts 16
  • the ratio of the total that is, the area ratio of the interlayer fusion bonding portion 16 is preferably 15% or less, more preferably 12% or less. Moreover, about the minimum of such a ratio, Preferably it is 5% or more, More preferably, it is 6% or more.
  • the interlayer fusion part 16 is continuous over the entire thickness direction Z of the laminated structure 13 (laminated nonwoven fabric 10), and the pattern of the interlayer fusion part 16 on the first surface 10a and the second surface 10b (the shape in plan view and Since the arrangement) is substantially the same, the description of the pattern of the interlayer fusion part 16 on the second surface 10b in the present specification (the interlayer fusion part dispersion arrangement region, the area ratio of the interlayer fusion part 16, etc.) Applies to the first surface 10a unless otherwise specified.
  • the interlayer fusion part 16 preferably has a shorter pitch than the interfiber fusion part 17. That is, referring to FIG. 1, it is preferable that a magnitude relationship of “pitch P16 of interlayer fusion part 16 ⁇ pitch P17 of interfiber fusion part 17” is established. With such a configuration, the first layer 11 has a large absorption capacity because it can absorb when the amount of perspiration begins to sweat, and the first layer 11 has a large absorption capacity. It will surely be played.
  • the interlayer fusion part 16 has a shorter distance between the fusion parts (shortest distance between the fusion parts) than the inter-fiber fusion part 17. That is, referring to FIG. 1, it is preferable that a magnitude relationship of “distance between fusion portions D16 of interlayer fusion portion 16 ⁇ distance D17 between fusion portions of interfiber fusion portion 17” is established.
  • fusion parts is a pattern in which the interlayer fusion
  • the area of the second surface 10b of one interlayer fusion part 16 is 0.3 mm 2 or less, and one fiber-to-fiber fusion. It is preferable that the area of the portion 17 is smaller than the area of the first surface 10a.
  • the area of the second surface 10b of the interlayer fusion part 16 is preferably 0.25 mm 2 or less, and the lower limit is preferably 0.1 mm 2 or more, more preferably 0.15 mm 2 or more.
  • the ratio of the area (the former) on the second surface 10b of one interlayer fusion part 16 to the area (the latter) on the first surface 10a of one interfiber fusion part 17 (that is, one fiber)
  • the ratio of the area of the second surface 10b of one interlayer fusion part 16 to the area of the first surface 10a of the inter-fused part 17) is preferably 0.25 or more, more preferably 0. 3 or more, preferably 0.8 or less, more preferably 0.75 or less.
  • Such a configuration is such that when the interlayer fusion part 16 and the inter-fiber fusion part 17 are each a pattern in which a plurality are arranged in the form of scattered dots in plan view, for example, the interlayer fusion part 16 is shown in FIG.
  • the patterns shown in a) to FIG. 2C and the interfiber fusion portion 17 are particularly effective when the patterns shown in FIGS. 3A to 3E are used.
  • the basis weight in particular of the 1st layer 11 and the 2nd layer 12 is not restrict
  • the laminated nonwoven fabric 10 is used as a constituent member of an absorbent article (such as a disposable diaper or a sanitary napkin) (surface sheet, sweat absorbent sheet, etc.)
  • the basis weight of the first layer 11 and the second layer 12 is preferably 8 g / m 2 or more, more preferably 10 g / m 2 or more, and preferably 30 g / m 2 or less, more preferably 27 g / m 2. m 2 or less.
  • the hydrophilic first layer 11 is formed on the second surface 10b of the second layer 12 when the hydrophobic second layer 12 (second surface 10b) is the side on which the liquid to be absorbed first comes into contact.
  • This relates to the absorption capacity of the liquid by the peripheral edge portion of the interlayer fusion bonding portion 16 and the vicinity thereof.
  • the basis weight of the first layer 11 increases, the absorption power increases and the strength also improves.
  • the basis weight of the first layer 11 is too large, the first layer 11 becomes bulky or increases in rigidity. As a result, when it is used as a constituent member of an absorbent article, there is a possibility of causing a decrease in wearing feeling.
  • the basis weight of the first layer 11 is preferably 5 g / m 2 or more, more preferably 7 g / m 2 or more, and preferably 25 g / m 2 or less, more preferably 20 g / m 2 or less. is there.
  • the hydrophobic second layer 12 is usually the side that comes into contact with the liquid first when the laminated nonwoven fabric 10 is used for liquid absorption.
  • the second layer 12 is A comparatively small basis weight and a thinner thickness tends to absorb the liquid through the peripheral portion of the interlayer fusion bonding portion 16 on the second surface 10b and the vicinity thereof.
  • the basis weight of the second layer 12 is preferably 3 g / m 2 or more, more preferably 5 g / m 2 or more, and preferably 15 g / m 2 or less, more preferably 13 g / m 2 or less.
  • the second layer 12 has a low basis weight of about 3 g / m 2 , there is a concern that the insufficient strength of the second layer 12 becomes serious and it becomes difficult to manufacture the laminated nonwoven fabric 10. According to the method for producing a laminated nonwoven fabric of the present invention, since the second layer 12 is produced by a so-called direct spinning method, such a concern is eliminated.
  • the hydrophilic first layer 11 is a spunbond nonwoven fabric coated with a hydrophilic agent or an SMS nonwoven fabric coated with a hydrophilic agent. Is particularly preferred.
  • the hydrophilic first layer 11 is an air-through nonwoven fabric containing the hydrophilic fibers 14 in an amount of 70% by mass or more, preferably 75% by mass or more, and the inter-fiber fusion part 17 is the air-through.
  • the area of one interfiber fusion part 17 is preferably 0.2 mm 2 or more, more preferably 0.3 mm 2 or more, and preferably 1 mm 2 or less, more preferably 0.8 mm 2.
  • the number of interfiber fusion portions 17 existing per unit area of 10 mm square on one side of such an air-through nonwoven fabric is preferably 4 or more, more preferably 6 or more, and preferably 30 or less, The number is preferably 28 or less.
  • the hydrophobic second layer 12 is preferably a spunbond nonwoven fabric, a melt blown nonwoven fabric, or a laminated nonwoven fabric thereof (for example, SMS nonwoven fabric) because it has a relatively small thickness and therefore relatively easily absorbs liquid.
  • the hydrophilic fiber 14 that is the main constituent fiber of the first layer 11 is typically obtained by subjecting an inherently hydrophobic thermoplastic fiber to a hydrophilic treatment. That is, it can be said that the first layer 11 is obtained by hydrophilizing an aggregate of hydrophobic fibers (for example, thermoplastic fibers that can be used as constituent fibers of the second layer 12).
  • hydrophilization treatment as described above, in addition to the application of the hydrophilizing agent to the fiber or fiber aggregate, the kneading of the hydrophilizing agent into the fiber, plasma treatment, etc. can be used. The process used is common.
  • the first layer 11 As an example of the first layer 11, a form in which a hydrophilizing agent is coated on the second surface 10b side (the hydrophilizing agent is attached to the surface of the constituent fiber on the second surface 10b side) can be mentioned.
  • the second surface 10b side of the first layer 11 is opposite to the first surface 10a, and is a layer adjacent to the first layer 11, that is, a layer having a lower hydrophilicity than the first layer 11 (in the form shown in FIG. 1). Is the contact surface side with the hydrophobic second layer 12).
  • the first layer 11 since the hydrophilic agent adhering to the surface of the constituent fibers is unevenly distributed on the second surface 10b side rather than the first surface 10a side, the first layer 11 is The hydrophilicity gradient is such that the first surface 10a side is relatively low in hydrophilicity and the second surface 10b side is relatively high in hydrophilicity.
  • the laminated structure 13 when the hydrophilicity is higher on the second surface 10 b side than on the first surface 10 a side, the laminated structure 13 has a hydrophobic second contact with the liquid to be absorbed first.
  • the method for applying the hydrophilizing agent is not particularly limited, and a known method capable of applying a coating liquid containing the hydrophilizing agent can be used as appropriate.
  • a coating method gravure coating, kiss coating, flexo coating, spray coating, reverse coating and die coating are preferable, and gravure coating, flexo coating, spray coating and die coating which can be applied in a pattern are particularly preferable.
  • various surfactants used for hydrophilizing constituent members in absorbent articles such as disposable diapers can be used without particular limitation.
  • the first layer 11 is a hydrophilic non-woven fabric containing constituent fibers in which a hydrophilizing agent is kneaded.
  • the hydrophilizing agent is not attached to the surface of the hydrophilic fiber 14 which is the main constituent fiber, but is contained in the hydrophilic fiber 14.
  • the first layer 11 in the form in which the hydrophilizing agent is applied from one side described above has a hydrophilicity gradient in the thickness direction Z, whereas the first layer 11 in the form in which the hydrophilizing agent is kneaded into the constituent fibers.
  • the layer 11 does not have a hydrophilicity gradient in the thickness direction Z on the premise that the constituent fibers are uniformly distributed throughout the first layer 11, and the hydrophilicity is uniform.
  • the liquid absorbability of the laminated nonwoven fabric 10 is affected not only by the hydrophilicity gradient in the thickness direction described above but also by the thickness of the hydrophobic second layer 12.
  • a small distance between fibers and a large thickness are factors that increase water resistance.
  • the second layer 12 is preferably small in thickness and low in fiber density (long interfiber distance).
  • the hydrophilic layer adjacent thereto has high capillary density and can absorb water through the hydrophobic layer, so that the fiber density is high (the interfiber distance is small). Short).
  • the fiber density is relatively low (the distance between the fibers is long), and the fiber density is high between the fibers of the second layer 12 (second surface 10b) (the distance between the fibers is short).
  • the hydrophilic fiber of the first layer 11 is easily exposed to the second surface 10b side, and the liquid is quickly drawn into the inner surface from the peripheral portion of the interlayer fusion portion 16 and the vicinity thereof on the second surface 10b, and the drawn liquid is hydrophilic.
  • the first layer 11 is more stably absorbed and retained. From such a viewpoint, it is preferable that the first layer 11 has a higher fiber density than the second layer 12, that is, the distance between the constituent fibers is short.
  • the interfiber distance is measured by the following method.
  • the inter-fiber distance of a fiber assembly such as a nonwoven fabric or paper can be obtained by the following formula (1) based on the assumption of Wrotnowski.
  • the following formula (1) is generally used when determining the inter-fiber distance of the fiber assembly. Under the Wrotnowski assumption, the fibers are cylindrical, and the fibers are regularly arranged without crossing.
  • the inter-fiber distance of the sheet having the single layer structure is obtained by the following formula (1). .
  • the inter-fiber distance of the multilayered sheet is determined according to the following procedure. .
  • the inter-fiber distance of each fiber layer constituting the multilayer structure is calculated by the following formula (1).
  • the thickness t, the basis weight W, the fiber resin density ⁇ , and the fiber diameter D used in the following formula (1) are respectively those for the layer to be measured.
  • the thickness t, the basis weight W, and the fiber diameter D are average values of measured values at a plurality of measurement points, respectively.
  • the thickness t (mm) is measured by the following method.
  • a sheet to be measured is cut into a length of 50 mm and a width of 50 mm to produce a cut piece of the sheet.
  • a cut piece of this size cannot be produced as a sheet to be measured, such as when collecting a sheet from a small absorbent article, the largest possible cut piece is produced.
  • this cut piece is placed on a flat plate, a glass plate on the flat plate is placed thereon, and a weight is evenly placed on the glass plate so that the load including the glass plate is 49 Pa. Measure the thickness of the piece.
  • the measurement environment is a temperature of 20 ⁇ 2 ° C., the relative humidity is 65 ⁇ 5%, and the measurement instrument is a microscope (VHX-1000, manufactured by Keyence Corporation).
  • an enlarged photograph of the cut surface of the cut piece is obtained.
  • a photograph of a known size is simultaneously recorded.
  • a scale is matched with the enlarged photograph of the cut surface of the cut piece, and the thickness of the cut piece, that is, the thickness of the sheet to be measured is measured.
  • the above operation is performed three times, and the average of the three times is defined as the thickness t of the sheet to be measured.
  • the resin density ⁇ (g / cm 3 ) of the fiber is measured using a density gradient tube according to the measurement method of the density gradient tube method described in JIS L1015 Chemical Fiber Staple Test Method (URL is http: /// kikakurai.com/l/L1015-2010-01.html, the book is JIS Handbook Fiber-2000, described in P.764-765 of (Japan Standards Association).
  • D 10 cross-sections of cut fibers were measured using an S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd., and the average value was taken as the fiber diameter.
  • the measurement method of the fiber diameter D follows the ⁇ Measurement method of fiber diameter> described later.
  • the distance between the fibers of each layer is multiplied by the ratio of the thickness of the layer to the total thickness of the multilayer structure, and the numerical values of the layers thus obtained are totaled to obtain a sheet having the desired multilayer structure
  • the inter-fiber distance of the constituent fibers is required.
  • an SMS nonwoven fabric having a three-layer structure composed of two S layers and one M layer the two S layers are treated as one layer and the total thickness t of the three-layer structure is 0.11 mm
  • the inter-fiber distance LS of the S layer is 47.8 ⁇ m
  • the thickness t of the M layer is 0.01 mm
  • the inter-fiber distance LS of the M layer is 3.2 ⁇ m
  • the ratio of the inter-fiber distance of the constituent fibers (hydrophilic fibers 14) of the first layer 11 and the inter-fiber distance of the constituent fibers (hydrophobic fibers 15) of the second layer 12 is, as described above, the former ⁇ the latter.
  • the latter / the former is preferably 1.1 or more, more preferably 10 or more, and preferably 70 or less, more preferably 50 or less.
  • the inter-fiber distance of the constituent fibers (hydrophilic fibers 14) of the first layer 11 is preferably 5 ⁇ m or more, more preferably 7 ⁇ m or more, and preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less.
  • the inter-fiber distance of the constituent fibers (hydrophobic fibers 15) of the second layer 12 is preferably 7 ⁇ m or more, more preferably 10 ⁇ m or more, and preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less.
  • the liquid non-absorbability is imparted to the laminated nonwoven fabric 10 by applying a fiber density gradient such that the fiber density increases from the second layer 12 to the first layer 11 (inward in the thickness direction Z of the laminated structure 13).
  • the constituent fiber (hydrophilic fiber 14) of the first layer 11 preferably has a smaller fiber diameter than the constituent fiber (hydrophobic fiber 15) of the second layer 12.
  • the fiber diameter is measured by the following method.
  • a measurement object (fiber layer, laminated nonwoven fabric) is cut with a razor (for example, a feather blade manufactured by Feather Safety Razor Co., Ltd.) to obtain a measurement piece having a square shape (8 mm ⁇ 4 mm) in plan view.
  • a razor for example, a feather blade manufactured by Feather Safety Razor Co., Ltd.
  • care is taken so that the structure of the cut surface of the measurement piece formed by the cutting is not destroyed by the pressure at the time of cutting or the like.
  • a preferable method for cutting the measurement target there is a method in which the measurement target is placed in liquid nitrogen and frozen sufficiently before the measurement target is cut, and then cut.
  • the measurement piece is attached to the sample stage. Next, the measurement piece is coated with platinum. For coating, an ion sputtering apparatus E-1030 (trade name) manufactured by Hitachi Naka Seiki Co., Ltd. is used, and the sputtering time is 30 seconds. The cut surface of the measurement piece is observed at a magnification of 1000 times using an S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd.
  • the fiber diameter measuring method when measuring the constituent fiber (hydrophilic fiber 14) of the first layer 11, the fiber connected to the interfiber fusion part 17 is selected and the constituent fiber of the second layer 12 is selected.
  • the constituent fiber (hydrophobic fiber 15) of the 2nd layer 12 which overlaps the interfiber fusion part 17 is selected, and the length of the width direction with respect to the longitudinal direction of a fiber about each is selected.
  • the measurement target is a composite nonwoven fabric composed of a plurality of fiber layers having different fiber diameters, such as an SMS nonwoven fabric and an SMMS nonwoven fabric
  • the liquid absorbability in the first layer 11 is such that the fibers are thin and the fiber density is high.
  • the influence of the meltblown layer is large, and the liquid absorptivity from the second surface 10b side is greatly influenced by the meltblown layer in which the fibers of the second layer 12 are thin and the fiber density is high.
  • the measurement object is a composite nonwoven fabric composed of a plurality of fiber layers having different fiber diameters and including a meltblown layer
  • the fibers of the meltblown layer in the composite nonwoven fabric The diameter will be measured.
  • Ratio of the fiber diameter (the former) of the constituent fiber (hydrophilic fiber 14) of the first layer 11 and the fiber diameter (the latter) of the constituent fiber (hydrophobic fiber 15) of the second layer 12 is based on the assumption that the former ⁇ the latter / the latter. Is preferably 0.05 or more, more preferably 0.06 or more, and preferably 0.9 or less, more preferably 0.8 or less.
  • the fiber diameter of the constituent fibers (hydrophilic fibers 14) of the first layer 11 is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more, and preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less.
  • the fiber diameter of the constituent fibers (hydrophobic fiber 15) of the second layer 12 is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less.
  • the hydrophilic fiber 14 that is the main constituent fiber of the first layer 11 is a unit compared to the hydrophobic fiber 15 that is the main constituent fiber of the second layer 12. It is preferable that the amount of fibers per area (number of fibers) is large. The amount of fiber per unit area is measured by the following method.
  • the laminated nonwoven fabric 10 to be measured is cut with a razor in the same manner as in the above ⁇ Method for measuring fiber diameter> so as to pass through the interfiber fusion part 17 to obtain a measurement piece.
  • the cut surface of the measurement piece is enlarged and observed (adjusted to a magnification capable of measuring about 30 to 60 fiber cross sections; 150 to 500 times), and the cut per fixed area (about 0.5 mm 2 ) Count the number of cross-sections of the fibers cut by the face.
  • the fibers connected to the interfiber fusion portion 17 are selected.
  • the constituent fiber (hydrophobic fiber 15) of the second layer 12 overlapping the inter-fiber fusion part 17 is selected.
  • the entire constant area in the thickness direction near the interfiber fusion part 17 The number of constituent fibers (hydrophilic fibers 14) of the first layer 11 is obtained by subtracting the number of constituent fibers (hydrophobic fibers 15) of the second layer 12 overlapping the inter-fiber fusion part 17 from the number of cross-sections of the fibers. To do. The measurement is performed at three locations, and the average value is defined as the amount of fibers.
  • the ratio of the amount of fibers per unit area of the hydrophilic fibers 14 of the first layer 11 to the amount of fibers per unit area of the hydrophobic fibers 15) is the former / the latter on the assumption that the former> the latter as described above. Is preferably 1.8 or more, more preferably 2.0 or more, and preferably 8 or less, more preferably 6 or less.
  • the amount of fibers (number of fibers) per unit area of the hydrophilic fibers 14 of the first layer 11 is preferably 10 fibers / mm 2 or more, more preferably 15 fibers / mm 2 or more, and preferably 300 fibers / mm 2. Hereinafter, it is more preferably 200 pieces / mm 2 or less.
  • the amount of fibers (number of fibers) per unit area of the hydrophobic fibers 15 of the second layer 12 is preferably 3 fibers / mm 2 or more, more preferably 5 fibers / mm 2 or more, and preferably 100 fibers / mm 2. Hereinafter, it is more preferably 70 pieces / mm 2 or less.
  • the laminated structure in the laminated nonwoven fabric of the present invention may have other layers in addition to the hydrophilic first layer containing hydrophilic fibers and the hydrophobic second layer containing hydrophobic fibers described above.
  • a long fiber layer containing long fibers may be disposed on the second surface 10 b side of the second layer 12. That is, the laminated nonwoven fabric 10 includes a first layer 11 that forms the first surface 10a, a long fiber layer (not shown) that forms the second surface 10b, and a second layer 12 interposed between the two layers.
  • a multilayer structure of three or more layers may be used.
  • the configuration of the long fiber layer is not particularly limited, but is preferably a hydrophilic layer from the viewpoint of improving liquid absorbability from the second surface 10b side, and is a layer mainly composed of hydrophilic fibers. preferable.
  • the hydrophilic fiber that is the main constituent fiber of the long fiber layer any hydrophilic fiber that can be used in the first layer can be used without particular limitation.
  • the long fiber layer one having a hydrophilic layer containing fibers kneaded with a hydrophilizing agent can be exemplified.
  • the basis weight of the long fiber layer is not particularly limited, but is preferably 2 g / m 2 or more, more preferably 3 g / m 2 or more, and preferably 10 g / m 2 or less, more preferably 8 g / m 2 or less. .
  • the laminated structure in the laminated nonwoven fabric 10 shown in FIG. 1 there is a form in which an elastic member (not shown) is interposed between the first layer 11 and the second layer 12.
  • an elastic member (not shown) is interposed between the first layer 11 and the second layer 12.
  • the elastic member is not limited to be interposed between the first layer 11 and the second layer 12 but can be interposed between arbitrary layers.
  • the elastic member can be extended, and when the force is released from a state where the elastic member is extended 1.3 times the original length (1.3 times the original length), It preferably has a property (elasticity) of returning to a length of 1.1 times or less of the original length.
  • the non-elastic member is a member that does not have such “elasticity”, that is, a state in which the non-elastic member is stretched 1.3 times the original length (the length is 1.3 times the original length). When the force is released, the member does not return to a length of 1.1 times or less of the original length.
  • the form of the elastic member is not particularly limited, and any form such as a thread form, a sheet form, and an aggregate of elastic fibers (elastic fiber layer) can be selected.
  • the laminated nonwoven fabric 10 (laminated structure 13) shown in FIG. 1, a plurality of thread-like (filament-like) elastic members are interposed between the first layer 11 and the second layer 12 so as to extend in the same direction.
  • the laminated nonwoven fabric 10 (laminated structure 13) has elasticity in the extending direction of the elastic member.
  • thermoplastic elastomer resin material examples include SBS (styrene-butadiene-styrene) and SIS (styrene-isoprene-styrene).
  • SEBS styrene-ethylene-butadiene-styrene
  • SEPS styrene-ethylene-propylene-styrene
  • olefin elastomers ethylene ⁇ -olefin elastomers, ethylene, butene, octene, etc.
  • Propylene-based elastomer polyester-based elastomer
  • polyurethane-based elastomer polyurethane-based elastomer.
  • FIG. 5 shows an outline of an example of the method for manufacturing the laminated nonwoven fabric 10 described above as an embodiment of the method for producing the laminated nonwoven fabric of the present invention.
  • the laminated nonwoven fabric 10 has a laminated structure 13 of fiber layers containing thermoplastic fibers (hydrophilic fibers 14 and hydrophobic fibers 15), and the layers constituting the laminated structure 13 are interlaminar fused portions 16. And are fused to each other.
  • the laminated nonwoven fabric 10 is produced by transporting a hydrophilic base nonwoven fabric 11P and depositing hydrophobic fibers 15 obtained by spinning the resin on the base nonwoven fabric 11P being transported. There are a step of obtaining the laminate 10P and an interlayer fusion step of forming the interlayer fusion part 16 by heating the laminate 10P while partially compressing the laminate 10P in the thickness direction.
  • the base nonwoven fabric 11P has an inter-fiber fusion part 17 in which the constituent fibers (hydrophilic fibers 14) are fused to each other at a higher density than the peripheral part, and is finally the production object of this production method. It becomes the first layer 11 in the laminated nonwoven fabric 10.
  • the base nonwoven fabric 11P wound in a roll shape is unwound and conveyed in one direction indicated by reference numeral MD on the conveyor 50, and in the middle of the conveyance, the conveyor 50 Hydrophobic fibers 15 are spun from the spinneret of the spinning head 51 disposed above and directly deposited on the base nonwoven fabric 11P to obtain a laminate 10P.
  • the laminated body 10P is continuously conveyed and supplied between the pair of embossing rolls 52 and 53, and the laminated body 10P is subjected to hot embossing to form the interlayer fusion bonding part 16 (interlayer fusion process).
  • the embossing roll 52 is disposed above the transported laminate 10P, and is in contact with the deposit (web) of the spun hydrophobic fibers 15 directly during hot embossing, and the embossing roll 53 is transported. It arrange
  • the laminate 10P is heated to a temperature equal to or higher than the melting point of the thermoplastic fibers (hydrophilic fibers 14 and hydrophobic fibers 15) included therein.
  • the laminated body 10P is partially compressed from the deposit side of the hydrophobic fiber 15 to the base nonwoven fabric 11P side by the convex portion of the embossing roll 52, and the interlayer fused portion 16 is compressed to the compressed portion. Is formed.
  • the deposit of the hydrophobic fibers 15 becomes a nonwoven fabric and is integrated with the base nonwoven fabric 11P via the interlayer fusion portion 16.
  • the laminated nonwoven fabric 10 which has the laminated structure 13 of the 1st layer 11 which consists of the base nonwoven fabric 11P, and the 2nd layer 12 which consists of the deposit (web) of the hydrophobic fiber 15 by the above is obtained.
  • the interlayer fusion part 16 is recessed in a concave shape from the second surface 10b side to the first surface 10a side.
  • hydrophobic fiber 15 is directly spun on the hydrophilic base nonwoven fabric 11P by a melt spinning method or the like to form a web as a deposit.
  • a melt spinning method or the like to form a web as a deposit.
  • a long fiber obtained by melt spinning is once wound up with a winder and then drawn or cut (hydrophobic fiber 15). ) Is not deposited on the base nonwoven fabric 11P.
  • the basis weight of the laminated nonwoven fabric is compared with a method in which a plurality of nonwoven fabrics are stacked and integrated by hot embossing.
  • the amount can be reduced, and in particular, the hydrophobic second layer 12 formed by direct spinning can be easily thinned.
  • the second layer 12 has a relatively small basis weight and a small thickness because the second layer 12 can easily absorb the liquid through the peripheral portion of the interlayer fusion portion 16 and its vicinity on the second surface 10b.
  • the spun hydrophobic fibers 15 are directly deposited on the hydrophilic base nonwoven fabric 11P to form the laminate 10P, so that the hydrophobic fibers 15 can easily enter the base nonwoven fabric 11P. Since the adhesiveness between the first layer 11 and the second layer 12 is increased, as described above, when the interlayer fusion portion 16 and the periphery thereof on the second surface 10b are used as a liquid drawing portion, high liquid absorbency is exhibited. Furthermore, a high-quality laminated nonwoven fabric 10 that is also strong in strength is obtained.
  • the laminated nonwoven fabric of the present invention includes a form in which a plurality of the second layers 12 are laminated and the laminated structure 13 has three or more layers.
  • the laminated body In the step of obtaining 10P, the hydrophobic fibers 15 may be deposited on the base nonwoven fabric 11P multiple times.
  • a plurality of spinning heads 51 are intermittently arranged in the conveying direction MD, and the hydrophobic fibers 15 are spun sequentially from each spinning head 51 and directly deposited on the base nonwoven fabric 11P. That's fine.
  • the base nonwoven fabric 11P can be manufactured according to a conventional method according to the type of the base nonwoven fabric 11P.
  • the base non-woven fabric 11P typically has a step of obtaining a web by depositing fibers obtained by spinning a resin, and heating the inter-fiber fusion portion 17 by partially compressing the web in the thickness direction. It is manufactured through an interfiber fusion process to be formed.
  • the base nonwoven fabric 11P (first layer 11) is a spunbond nonwoven fabric
  • its production is as follows. That is, first, a resin composition as a raw material for a nonwoven fabric is melted by an extruder or the like and discharged from a spinneret of a spinning head to spin long fibers.
  • the spun long fibers are cooled with a cooling fluid, and further, tension is applied to the long fibers with drawn air to obtain a predetermined fineness, and the fibers are collected as they are on the collecting belt and deposited to a predetermined thickness. Subsequently, the fusion process of the long fiber by hot embossing is performed, and the inter-fiber fusion part 17 is formed.
  • the web (sheet-like material in which inter-fiber fusion has not been performed; a precursor of the base nonwoven fabric 11P) is heated while being compressed in the thickness direction from one side thereof, and the inter-fiber fusion is performed.
  • a landing portion 17 is formed.
  • the so-called direct spinning method is used to produce the laminated nonwoven fabric 10 as described above.
  • Hydrophobic fibers 15 are deposited on the surface opposite to the compression surface of the base nonwoven fabric 11P (the surface on which the inter-fiber fusion portion 17 that is recessed in a concave shape is formed).
  • the interfiber fusion part 17 is recessed in a concave shape from the first surface 10a side to the second surface 10b side.
  • the base non-woven fabric 11P becomes the hydrophilic first layer 11 in the laminated non-woven fabric 10 which is a production object, and has been subjected to a hydrophilization treatment at least before the hydrophobic fibers 15 are directly deposited.
  • the hydrophilic treatment of the base nonwoven fabric 11P utilizes a known hydrophilic treatment such as application of a hydrophilic agent to fibers or fiber aggregates, kneading of the hydrophilic agent into fibers, plasma treatment, or the like.
  • a hydrophilic agent kneading or a hydrophilic agent coating is utilized.
  • the base non-woven fabric 11P (first layer 11) is a spunbond non-woven fabric
  • the hydrophilizing agent is added to a thermoplastic resin so as to have a predetermined concentration.
  • a hydrophilic agent master batch prepared by melt kneading and a thermoplastic resin as a raw material for the nonwoven fabric are mixed at a predetermined ratio, the mixture is melted by an extruder or the like, and discharged from the spinneret of the spinning head to produce long fibers.
  • the long fibers spun in this way are hydrophilic fibers 14.
  • the base non-woven fabric 11P is made of thermoplastic fibers (hydrophobic fibers) and has an interfiber fusion portion 17 obtained by a conventional method.
  • a hydrophilic agent is applied to the hydrophobic nonwoven fabric (precursor of the base nonwoven fabric 11P).
  • the laminated nonwoven fabric 10 is manufactured using the so-called direct spinning method as described above using the base nonwoven fabric 11P to which the hydrophilic agent is applied by coating, the coating of the hydrophilic agent on the base nonwoven fabric 11P is performed. Hydrophobic fibers 15 are deposited on the work surface.
  • the laminated nonwoven fabric 10 thus obtained, a hydrophilizing agent is applied to the second surface 10b side of the first layer 11 made of the base nonwoven fabric 11P. Therefore, as described above, the first layer 11 The first surface 10a side has a relatively low hydrophilicity, and the second surface 10b side has a relatively high hydrophilicity gradient. That is, in the laminated nonwoven fabric 10 (laminated structure 13) obtained in this way, the hydrophilicity increases stepwise from the hydrophobic second layer 12 (second surface 10b) inward in the thickness direction of the laminated structure 13. Since a hydrophilicity gradient is formed, further improvement in liquid absorbency can be expected.
  • the laminated body 10P (laminated nonwoven fabric 10).
  • a calendar process is a process of densifying the fiber assembly by applying heat and pressure to the fiber assembly such as a nonwoven fabric with a calendar roll.
  • the number and arrangement of the calendar rolls used for the calendar process are not particularly limited. For example, a series type or an inclined type constituted by three calendar rolls, a series type constituted by four calendar rolls, or an inverted L type. Z type or inclined Z type, and Z type or L type composed of five calender rolls can be used.
  • the temperature in the calendar process is preferably equal to or lower than the softening point of the constituent fibers of the laminated body 10P (laminated nonwoven fabric 10) that is a workpiece. When calendering is performed at a temperature above the softening point, the nonwoven fabric becomes hard and the touch may be deteriorated.
  • the base nonwoven fabric 11P before depositing the hydrophobic fibers 15 on the base nonwoven fabric 11P, more specifically, before the base nonwoven fabric 11P being transported through the production line of the laminated nonwoven fabric 10 passes through the spinning head 51,
  • the base nonwoven fabric 11P may be subjected to a calendar process.
  • the calendar process in the present manufacturing method may be performed immediately before or immediately after the interlayer fusion process, before the hydrophobic fibers 15 are deposited on the base nonwoven fabric 11P, or both.
  • the web (a sheet-like material that has not been interfiber fused.
  • the precursor of the base nonwoven fabric 11P) may be subjected to a calendering treatment.
  • an elastic member having a form such as a thread shape, a sheet shape, an elastic fiber aggregate (elastic fiber layer) is interposed between the first layer and the second layer.
  • Other forms are included.
  • the elastic member is placed on the base nonwoven fabric 11P before the hydrophobic fibers 15 are deposited on the base nonwoven fabric 11P. Just place it.
  • the arrangement method of such an elastic member may be appropriately selected according to the form of the elastic member. For example, when an elastic fiber layer, which is an aggregate of elastic fibers, is provided as an elastic member, the elastic fibers can be directly spun on the base nonwoven fabric 11P, similarly to the hydrophobic fibers 15.
  • the absorbent article of the present invention is characterized in that it comprises the above-described laminated nonwoven fabric of the present invention.
  • the laminated nonwoven fabric of the present invention has a laminated structure of fiber layers containing thermoplastic fibers, and the laminated structure includes a first surface that is one surface of the laminated nonwoven fabric, and the other surface.
  • a first surface comprising a hydrophilic first layer including hydrophilic fibers, and a hydrophobic surface including hydrophobic fibers on the second surface side of the first layer.
  • the laminated nonwoven fabric is arranged with the second surface facing the skin side of the wearer.
  • FIGS. 6 to 8 show a pants-type disposable diaper 1 which is an embodiment of the absorbent article of the present invention.
  • the different structure part from the laminated nonwoven fabric 10 which is embodiment of the laminated nonwoven fabric mentioned above is mainly demonstrated, the same component is attached
  • the explanation about the laminated nonwoven fabric 10 is appropriately applied to the constituent parts that are not particularly explained.
  • the diaper 1 includes a ventral region A and a dorsal region B in the longitudinal direction X, and a crotch region C positioned between the A and B, and includes a ventral region A and An abdominal side waist flap FA and a back side waist flap that have an absorbent body 23 over the back side region B and extend outwardly from the front and rear end portions 23A, 23B in the longitudinal direction X of the absorbent body 23 and extend in the lateral direction Y Has FB.
  • the ventral region A is a region arranged on the wearer's belly side when wearing an absorbent article such as a disposable diaper
  • the back side region B is a wearer wearing an absorbent article such as a disposable diaper. It is an area arranged on the dorsal side.
  • the ventral region A and the dorsal region B are waist portions corresponding to the wearer's waist when the diaper 1 is worn.
  • the abdominal side waist flap FA is located in the longitudinal direction X outward from the edge of the front end portion 23 ⁇ / b> A on the abdominal side area A side in the longitudinal direction X of the absorber 23 and extends in the lateral direction Y. It means a region in which the region and the region extending in the lateral direction Y from the front end 23A on the ventral region A side in the longitudinal direction X of the absorbent body 23 are meant.
  • the back side waist flap FB is a region extending outward in the vertical direction X from the edge of the rear end portion 23B on the back side region B side in the vertical direction X of the absorber 23 and absorbing in the horizontal direction Y. It means a region that is combined with a region extending in the lateral direction Y from the rear end 23B of the body 23 in the longitudinal direction X on the back region B side.
  • the diaper 1 includes an absorbent main body 2 and an exterior body 3 that is arranged on the non-skin contact surface side of the absorbent main body 2 and fixes the absorbent main body 2.
  • the exterior body 3 includes an abdominal side waist flap FA and a back side waist flap FB that are located outward from the front and rear end portions 23A and 23B in the longitudinal direction X of the absorbent body 23 constituting the absorbent main body 2 and extend in the lateral direction Y.
  • stretchable areas are formed in the ventral waist flap FA and the back waist flap FB.
  • the diaper 1 has a pair of left and right side edges 3 a 1, 3 a 1 of the ventral region A of the exterior body 3 and left and right side edges 3 b 1, 3 b 1 of the back side region B of the exterior body 3 joined together.
  • This is a so-called pants-type disposable diaper in which side seal portions S, S, a waist opening WO and a pair of leg openings LO, LO are formed (see FIG. 6).
  • the outer body 3 of the diaper 1 is a plan view of the expanded and extended state shown in FIG.
  • the expanded and extended state of the diaper 1 here refers to peeling the side seal portion S to make the diaper 1 in the expanded state, and the diaper 1 in the expanded state with the elastic member of each part. It means a state in which it is expanded and expanded until it reaches a design dimension (same as the dimension when it is spread in a planar shape with no influence of the elastic member removed).
  • the “skin contact surface” is a surface of the diaper 1 or a component thereof (for example, the absorbent main body 2) that is directed toward the wearer's skin when worn, and “non-skin contact surface”. Is the surface of the diaper 1 or its constituent members that is directed to the side opposite to the wearer's skin side (clothing side) when worn.
  • the longitudinal direction X is a direction corresponding to a direction extending from the wearer's abdomen side to the back side through the crotch part, and the diaper 1 is unfolded and extended in a plane. It is a direction extending from the side region A to the back region B.
  • the horizontal direction Y is a direction orthogonal to the vertical direction X, and is the width direction of the diaper 1 in a state where it is unfolded on a plane and extended.
  • the diaper 1 is a left-right symmetric shape with respect to the vertical centerline CL1 extended in the vertical direction X shown in FIG.
  • CL2 in FIG. 7 is a horizontal center line extending in the horizontal direction Y that bisects the diaper 1, and is orthogonal to the vertical center line CL1.
  • the absorptive main body 2 has a vertically long shape in which the longitudinal direction X is relatively long when the diaper 1 is expanded and extended as shown in FIG.
  • the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin contact surface, a liquid-impermeable surface sheet (including water repellency) that forms a non-skin contact surface, and both the sheets 21. , 22 and a liquid-retaining absorbent 23 interposed between the two.
  • leak-proof cuffs 24 and 24 having elastic members arranged in the longitudinal direction X are provided on both sides along the longitudinal direction X (longitudinal direction) of the absorbent main body 2. It has been.
  • the leak-proof cuff 24 is made of a liquid-permeable or water-repellent and breathable material, and an elastic member for forming a leak-proof cuff is provided near the free end of each leak-proof cuff 24. 25 are arranged in a state of extending in the vertical direction X. When the diaper is worn, the free end side of the leak-proof cuff 24 rises due to the contraction of the leak-proof cuff forming elastic member 25 and the body fluid is prevented from flowing out in the lateral direction Y.
  • the absorbent main body 2 configured as described above is fixed to the central portion of the outer package 3 with its longitudinal direction aligned with the vertical direction X of the diaper 1 in the expanded and extended state. It is joined with adhesive.
  • the outer package 3 is arranged and bonded and fixed to the non-skin contact surface side of the back sheet 22 constituting the absorbent main body 2 in the thickness direction of the disposable diaper 1. Therefore, in the diaper 1, the absorbent body 23 constituting the absorbent main body 2 is disposed across the ventral region A and the back region B.
  • the exterior body 3 is positioned outward from the front and rear end portions 23 ⁇ / b> A and 23 ⁇ / b> B in the longitudinal direction X of the absorbent body 23 and extends to the ventral side waist flap FA and the back. It has a side waist flap FB. 6 to 8, the outer package 3 includes an outer layer sheet 6 on the non-skin contact surface side that forms the outer surface of the diaper 1, and an inner layer sheet 3i disposed on the skin contact surface side of the outer layer sheet 6.
  • the outer layer sheet 6 includes a folded portion 6R in which an extending portion extending from the front and rear end portions in the longitudinal direction X of the inner layer sheet 3i is folded back to the skin contact surface side of the inner layer sheet 3i.
  • the folded portion 6R of the outer layer sheet 6 is formed in a rectangular shape that is long in the lateral direction Y, as shown in FIG.
  • the front and rear end portions 23A and 23B of the absorbent main body 2 are each covered with a folded portion 6R.
  • the diaper 1 has an abdominal region A and a dorsal region B as waist portions corresponding to the wearer's waist when worn, as shown in FIG.
  • at least a waist stretchable portion G1 and a waistline lower stretchable portion G2 are formed as stretch regions, and a leg stretchable portion G3 can also be formed. That is, the exterior body 3 was intermittently arranged in the longitudinal direction X in the state of extending in the lateral direction Y between the outer layer sheet 6 and the inner layer sheet 3i constituting the exterior body 3 in both regions A and B.
  • a plurality of elastic members 71 are provided, whereby a waist stretchable part G1 and a waist lower stretchable part G2 are formed in both areas A and B as stretchable areas having stretchability in the lateral direction Y.
  • the exterior body 3 includes a plurality of leg elastic members 72 arranged in a state extending in a predetermined direction between the outer layer sheet 6 and the inner layer sheet 3i from both the regions A and B to the crotch region C.
  • the leg stretchable part G3 can be formed in these areas A, B and C as stretchable areas.
  • the waist stretchable part G ⁇ b> 1 is, as shown in FIGS. 6 and 7, the longitudinal edges X of the front and rear end parts 23 ⁇ / b> A and 23 ⁇ / b> B in the longitudinal direction X of the absorbent body 23 constituting the absorbent main body 2. It is formed in the end flap which is located on the outer side in the vertical direction X (the side opposite to the horizontal center line CL2 side). Moreover, in the diaper 1, the waist lower elastic part G2 is formed in the side flap located in the longitudinal direction X between the lower end by the side of the horizontal centerline CL2 of the waist elastic part G1, and the lower end of the side seal part S. ing.
  • the above-described back-side waist flap FB and ventral-side waist flap FA are regions where the end flap (waist stretchable portion G1) is combined with a part of the side flap (trunk lower stretchable portion G2). Moreover, in the diaper 1, the leg expansion-contraction part G3 is formed in the peripheral part of the leg opening part LO, as shown in FIG.6 and FIG.7.
  • the diaper 1 includes a sweat absorbing sheet 10 (see FIG. 1) capable of absorbing sweat.
  • the sweat absorbing sheet 10 is an embodiment of the laminated nonwoven fabric of the present invention described above. It is the laminated nonwoven fabric 10 which is a form.
  • the sweat-absorbent sheet 10 is arranged with the second surface 10b (the outer surface of the hydrophobic second layer 12) facing the wearer's skin.
  • the sweat-absorbing sheet 10 is mainly intended to absorb sweat around the wearer's waist, and is disposed in the above-described stretchable region of the waist. That is, the sweat-absorbent sheet 10 has a shape that is long in one direction in a plan view as shown in FIG. 7, specifically, a rectangular shape (strip shape), and its longitudinal direction is made to coincide with the lateral direction Y. It is distribute
  • the sweat-absorbent sheet 10 is bonded to the skin contact surface of the folded portion 6R of the outer layer sheet 6 by a known bonding means such as an adhesive, a heat seal, or an ultrasonic seal.
  • the folded portion 6R is disposed closer to the wearer's skin than the absorbent body 23 when the diaper 1 is worn (see FIG. 8), and accordingly, the sweat absorbing sheet disposed on the skin contact surface of the folded portion 6R. 10 is arranged at a position closer to the wearer's skin than the absorber 23 when the diaper 1 is worn, and can contact the wearer's skin.
  • the sweat-absorbing sheet 10 (laminated nonwoven fabric 10) having a sweat-absorbing function is a diaper on the skin contact surface side of the abdominal region A and the back region B, which are waist portions. 1 is disposed closest to the skin of the wearer, and the arrangement region of the sweat-absorbing sheet 10 is an elastic region having elasticity in the lateral direction Y including the waist elastic part G1 and the waist lower elastic part G2.
  • the hydrophobic second surface 10b (see FIG. 1) of the sweat-absorbent sheet 10 comes into contact with the wearer's skin with good fit by tightening due to the contraction force of the stretchable region, and diverges from the skin.
  • the absorbed sweat can be absorbed and evaporated quickly.
  • the sweat absorbent sheet 10 (laminated nonwoven fabric 10) is disposed in the stretchable region, so from the viewpoint of improving the fit of the wearer to the skin, the sweat absorbent sheet 10 is also in the same direction as the stretchable region. That is, it is preferable to have elasticity in the lateral direction Y. From such a viewpoint, it is preferable that an elastic member (elastic member) having elasticity in the lateral direction Y is disposed between the first layer 11 and the second layer 12 in the sweat absorbent sheet 10. This elastic member is as described above.
  • the material for forming each part of the diaper 1 will be described.
  • the top sheet 21, the back sheet 22, the absorber 23, the leak-proof cuff 24, and the like constituting the absorbent main body 2 are conventionally used in absorbent articles such as disposable diapers.
  • Various things can be used without particular limitation.
  • a single layer or multilayer nonwoven fabric, a perforated film, or the like can be used.
  • a moisture-permeable resin film or the like can be used.
  • an absorbent core made of absorbent polymer particles and a fiber material and covered with tissue paper can be used.
  • a water-repellent single layer or multilayer nonwoven fabric or the like can be used as the leak-proof cuff 24, a water-repellent single layer or multilayer nonwoven fabric or the like can be used.
  • the elastic member examples include, for example, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, and stretchability. Examples thereof include polyolefin and polyurethane.
  • a thread-like (thread rubber etc.) having a cross section of a rectangle, a square, a circle, an ellipse, a polygon or the like, or a string-like (flat rubber etc.) can be preferably used.
  • various adhesives such as a hot melt adhesive conventionally used in this type of absorbent article can be used.
  • the laminated nonwoven fabric 10 which is one embodiment of the laminated nonwoven fabric of the present invention is used as the sweat-absorbent sheet 10.
  • the absorbent article of the present invention comprises the laminated nonwoven fabric of the present invention, and
  • the laminated nonwoven fabric only needs to be arranged with its second surface (hydrophobic surface having an interlayer fusion part) facing the wearer's skin side, and the laminated nonwoven fabric of the present invention is a component other than the sweat absorbent sheet.
  • the placement location is not limited to the placement location of the sweat-absorbing sheet 10 in the diaper 1.
  • Another use of the laminated nonwoven fabric of the present invention as a constituent member of an absorbent article is a surface sheet that is disposed closer to the wearer's skin than the absorbent body. That is, for example, in the diaper 1, the laminated nonwoven fabric 10 can be used as the top sheet 21.
  • the elastic member 71 is disposed between the outer layer sheet 6 and the inner layer sheet 3 i, but the elastic member 71 may not be disposed.
  • a stretchable nonwoven fabric having stretchability in the lateral direction Y may be used as a constituent member of the exterior body 3.
  • the exterior body 3 has a continuous shape extending over the abdominal area A, the crotch area C, and the dorsal area B.
  • the absorbent article of the present invention is not limited to the pants-type disposable diaper such as the diaper 1 described above, and can be applied to all articles used for absorbing body fluids. Can be applied to.
  • the sweat-absorbent sheet of the present invention is not limited to application to the absorbent article described above, and can be applied to articles other than absorbent articles.
  • the sweat-absorbing sheet of the present invention can be used as the sheet itself used by the user to wipe off sweat.
  • a laminated nonwoven fabric having a laminated structure of fiber layers containing thermoplastic fibers The laminated structure has a first surface that is one surface of the laminated nonwoven fabric and a second surface that is the other surface, and the first surface is composed of a hydrophilic first layer, A hydrophobic second layer is disposed on the second surface side of the layer,
  • the laminated structure has an interlayer fusion part having a thickness smaller than that of the peripheral part and in which the layers constituting the laminated structure are fused to each other;
  • the first layer further includes an inter-fiber fusion part in which the thickness is smaller than the peripheral part and the constituent fibers of the first layer are fused to each other.
  • One surface is a laminated nonwoven fabric having a larger area ratio of the fused portion than that of the second surface.
  • ⁇ 2> The laminated nonwoven fabric according to ⁇ 1>, wherein the ratio of the area of the fused portion of the first surface to the area of the fused portion of the second surface is 1.3 to 3.0 as the former / the latter.
  • the interlayer fusion part and the interfiber fusion part are different in at least two of the arrangement pattern, the planar view shape of the fusion part alone, the area of the fusion part alone, the distance between the fusion parts, and the pitch.
  • ⁇ 4> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 3>, wherein the interlayer fusion bonding portion is recessed in a concave shape from the second surface side to the first surface side.
  • ⁇ 5> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 4>, wherein the interfiber fusion part is recessed from the first surface side to the second surface side.
  • the second surface has an interlayer fusion portion dispersion arrangement region in which a plurality of the interlayer fusion portions are scattered, and a circle having a radius of 2 mm is virtually provided at an arbitrary position of the interlayer fusion portion dispersion arrangement region.
  • ⁇ 7> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 6>, wherein the ratio of the area of the interlayer fusion bonding portion to the area of the second surface is 15% or less.
  • ⁇ 8> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>, wherein the interlayer fusion part has a shorter pitch than the inter-fiber fusion part.
  • ⁇ 9> ⁇ 1> to ⁇ 8 wherein an area of the one interlayer fusion-bonded portion on the second surface is 0.3 mm 2 or less, and is smaller than an area of the one interfiber fusion-bonded portion on the first surface. > The laminated nonwoven fabric according to any one of the above.
  • the ratio of the area on the second surface of the one interlayer fusion part and the area on the first surface of the one interfiber fusion part is 0.25 or more and 0.8 or less as the former / the latter.
  • the laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 9>, wherein ⁇ 11> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 10>, wherein the combined basis weight of the first layer and the second layer is 8 g / m 2 to 30 g / m 2 .
  • ⁇ 12> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 11>, wherein the basis weight of the first layer is 5 g / m 2 or more and 25 g / m 2 or less.
  • ⁇ 13> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 12>, wherein the first layer has higher hydrophilicity on the second surface side than on the first surface side.
  • ⁇ 14> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 13>, wherein the first layer includes a constituent fiber having a hydrophilizing agent attached to the surface.
  • the first layer has a large amount of hydrophilizing agent adhering to the surface of the constituent fibers unevenly distributed on the second surface side rather than the first surface side.
  • ⁇ 16> The laminated nonwoven fabric according to any one of the above items ⁇ 1> to ⁇ 15>, wherein the first layer is a hydrophilic nonwoven fabric including constituent fibers into which a hydrophilizing agent is kneaded.
  • the first layer is a hydrophilic nonwoven fabric including constituent fibers into which a hydrophilizing agent is kneaded.
  • the basis weight of the second layer is 3 g / m 2 or more and 15 g / m 2 or less.
  • ⁇ 18> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 17>, wherein the first layer has a shorter inter-fiber distance between the constituent fibers than the second layer.
  • ⁇ 19> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 18>, wherein the constituent fibers of the first layer have a larger amount of fibers per unit area than the constituent fibers of the second layer.
  • ⁇ 20> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 19>, wherein the constituent fibers of the first layer have a fiber diameter smaller than that of the constituent fibers of the second layer.
  • ⁇ 22> The laminated nonwoven fabric according to ⁇ 21>, wherein the long fiber layer has a hydrophilic layer containing constituent fibers in which a hydrophilizing agent is kneaded.
  • ⁇ 23> The laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 22>, wherein an elastic member is interposed between the first layer and the second layer.
  • a method for producing a laminated nonwoven fabric comprising a laminated structure of fiber layers containing thermoplastic fibers, wherein each layer constituting the laminated structure is fused to each other at an interlayer fusion part, Obtained by transporting a hydrophilic base non-woven fabric having an inter-fiber fused portion in which the constituent fibers are fused to each other at a higher density than the peripheral portion, and spinning the resin on the base non-woven fabric being transported Depositing hydrophobic fibers to obtain a laminate;
  • a method for producing a laminated nonwoven fabric comprising: an interlayer fusion process in which the laminate is heated while being partially compressed in the thickness direction to form the interlayer fusion part.
  • the base non-woven fabric includes a step of obtaining a web by depositing hydrophilic fibers obtained by spinning a resin, and a fiber that forms the inter-fiber fusion portion by heating the web while partially compressing the web in the thickness direction. Manufactured through a fusion process, The method for producing a laminated nonwoven fabric according to ⁇ 24> or ⁇ 25>, wherein the web is calendered immediately before or after the interfiber fusion step.
  • ⁇ 27> The method for producing a laminated nonwoven fabric according to any one of ⁇ 24> to ⁇ 26>, wherein the base nonwoven fabric is calendered before the hydrophobic fibers are deposited on the base nonwoven fabric.
  • the interfiber fusion part of the base nonwoven fabric is formed by being compressed in the thickness direction from one side, and the hydrophobic fibers are deposited on a surface opposite to the compression surface.
  • 27> The manufacturing method of the laminated nonwoven fabric of any one of 27.
  • ⁇ 29> The laminated nonwoven fabric according to any one of ⁇ 24> to ⁇ 28>, wherein a hydrophilic agent is applied to one surface of the base nonwoven fabric, and the hydrophobic fibers are deposited on the hydrophilic agent-coated surface.
  • An absorbent article comprising a laminated nonwoven fabric having a laminated structure of fiber layers containing thermoplastic fibers,
  • the laminated structure has a first surface that is one surface of the laminated nonwoven fabric and a second surface that is the other surface, and the first surface is composed of a hydrophilic first layer, A hydrophobic second layer is disposed on the second surface side of the layer,
  • the laminated structure has an interlayer fusion part having a thickness smaller than that of the peripheral part and in which the layers constituting the laminated structure are fused to each other;
  • the first layer further includes an inter-fiber fusion part in which the thickness is smaller than the peripheral part and the constituent fibers of the first layer are fused to each other.
  • the ratio of the total area of the interlayer fusion part and the inter-fiber fusion part of the surface to the area of the first surface and the second surface is the fusion part area ratio of each surface
  • One surface has a larger area ratio of the fused portion than the second surface
  • ⁇ 33> The absorbent article according to ⁇ 32>, further comprising a liquid-retaining absorbent, wherein the laminated nonwoven fabric is disposed at a position closer to the wearer's skin than the absorbent.
  • ⁇ 34> The absorbent article according to ⁇ 32> or ⁇ 33>, wherein the absorbent article has a waist circumference portion corresponding to a waist circumference of a wearer, and the laminated nonwoven fabric is arranged on the waist circumference portion.
  • ⁇ 35> The absorbent article according to ⁇ 34>, wherein the waist has a stretchable region, and the laminated nonwoven fabric is disposed in the stretchable region.
  • ⁇ 36> The absorbent article according to ⁇ 35>, wherein an elastic member is interposed between the first layer and the second layer in the laminated nonwoven fabric.
  • ⁇ 37> The absorbent article according to ⁇ 32>, further comprising a sweat absorbent sheet capable of absorbing sweat, wherein the sweat absorbent sheet is the laminated nonwoven fabric.
  • the laminated structure has a laminated structure of fiber layers containing thermoplastic fibers, has a first surface and a second surface located on the opposite side, and is used with the second surface facing the wearer's skin side.
  • a sweat-absorbing sheet The first surface is composed of a hydrophilic first layer, and a hydrophobic second layer is disposed on the second surface side of the first layer,
  • the laminated structure has an interlayer fusion part having a thickness smaller than that of the peripheral part and in which the layers constituting the laminated structure are fused to each other;
  • the first layer further includes an inter-fiber fusion part in which the thickness is smaller than the peripheral part and the constituent fibers of the first layer are fused to each other.
  • One surface is a sweat-absorbing sheet having a larger area ratio of the fused portion than the second surface.
  • ⁇ 39> The use of the laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 23> for absorbing sweat.
  • ⁇ 40> A method of absorbing sweat using the laminated nonwoven fabric according to any one of ⁇ 1> to ⁇ 23>.
  • a laminated nonwoven fabric excellent in the ability to absorb body fluid such as sweat and urine a method for producing the same, an absorbent article, and a sweat absorbing sheet.

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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)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
PCT/JP2017/010465 2017-03-15 2017-03-15 積層不織布及びその製造方法並びに吸収性物品及び吸汗シート WO2018167882A1 (ja)

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RU2019131470A RU2723405C1 (ru) 2017-03-15 2017-03-15 Впитывающее изделие
JP2019505594A JP6539007B2 (ja) 2017-03-15 2017-03-15 吸収性物品
PCT/JP2017/010465 WO2018167882A1 (ja) 2017-03-15 2017-03-15 積層不織布及びその製造方法並びに吸収性物品及び吸汗シート
CN201780087145.1A CN110325679B (zh) 2017-03-15 2017-03-15 吸收性物品

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CN111839898A (zh) * 2019-04-26 2020-10-30 尤妮佳股份有限公司 层叠体和吸收性物品
WO2020250481A1 (ja) * 2019-06-11 2020-12-17 花王株式会社 吸収性物品用積層不織布
WO2022054613A1 (ja) * 2020-09-10 2022-03-17 ユニ・チャーム株式会社 体液吸収用シート
JP7226659B1 (ja) * 2021-09-15 2023-02-21 東レ株式会社 スパンボンド不織布および衛生材料
WO2023042540A1 (ja) * 2021-09-15 2023-03-23 東レ株式会社 スパンボンド不織布および衛生材料

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JP7147106B1 (ja) * 2021-04-06 2022-10-04 シンワ株式会社 積層シートの製造方法及び衛生マスクの製造方法並びに積層シート
CN115534455B (zh) * 2022-11-30 2023-03-17 苏州多瑈新材料科技有限公司 一种防水透湿保暖材料及其制备方法

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CN111839898A (zh) * 2019-04-26 2020-10-30 尤妮佳股份有限公司 层叠体和吸收性物品
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WO2023042540A1 (ja) * 2021-09-15 2023-03-23 東レ株式会社 スパンボンド不織布および衛生材料

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JP6539007B2 (ja) 2019-07-03
CN110325679B (zh) 2022-04-12
JPWO2018167882A1 (ja) 2019-06-27
CN110325679A (zh) 2019-10-11

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