WO2021172475A1 - 吸収性物品用不織布及びこれを備える吸収性物品 - Google Patents

吸収性物品用不織布及びこれを備える吸収性物品 Download PDF

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Publication number
WO2021172475A1
WO2021172475A1 PCT/JP2021/007205 JP2021007205W WO2021172475A1 WO 2021172475 A1 WO2021172475 A1 WO 2021172475A1 JP 2021007205 W JP2021007205 W JP 2021007205W WO 2021172475 A1 WO2021172475 A1 WO 2021172475A1
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WIPO (PCT)
Prior art keywords
woven fabric
fibers
fiber
absorbent articles
less
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PCT/JP2021/007205
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English (en)
French (fr)
Japanese (ja)
Inventor
由彦 衣笠
菅原　拓也
真行 湊崎
Original Assignee
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 CN202180016969.6A priority Critical patent/CN115175648B/zh
Priority to JP2022503725A priority patent/JPWO2021172475A1/ja
Publication of WO2021172475A1 publication Critical patent/WO2021172475A1/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
    • 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
    • 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
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin

Definitions

  • the present invention relates to a non-woven fabric for an absorbent article and an absorbent article including the non-woven fabric.
  • Nonwoven fabric is used for the sheet members that make up absorbent articles such as disposable diapers.
  • Various studies have been conducted on the composition of the non-woven fabric used for the absorbent article from the viewpoint of softness, texture and other texture and liquid retention.
  • the applicant is an air-through nonwoven fabric having a first layer and a second layer having a density lower than that of the first layer, and the cross section of the fibers contained in the first layer is flat.
  • Patent Document 1 a non-woven fabric in which the long-axis direction of the cross section is substantially oriented in the plane direction of the non-woven fabric.
  • the average deviation of the surface roughness and the average deviation of the friction coefficient on the surface on the first layer side, and the linear LC and flexural rigidity of the compression characteristics are defined within a predetermined range.
  • Patent Document 2 contains polyethylene fibers and cellulosic fibers, and has a WC value of 0.50 gf ⁇ cm / cm 2 or more in a KES compression test. Is described. It is described that such a non-woven fabric has only a non-fixed portion at a portion where the fibers contained in the constituent fibers come into contact with each other.
  • Non-woven fabric processed so that the fiber tips on the surface that comes into contact with the skin do not fluff a known method such as an air-through method is appropriately used in Patent Document 3, and a method of applying pressure to the surface that comes into contact with the skin with a roller.
  • the non-woven fabrics manufactured in are described. It is said that the roller is preferably superheated to 120 to 130 ° C., while when the temperature is 130 ° C. or higher, the heat melting effect is large, the bonding range between fibers is widened, and the moisture permeability effect is impaired. Is described.
  • the fastening tape with the outer back sheet it is manufactured by an air-through method in which heated air is sent during the drum transfer process to heat-fuse the fibers at 130.5 to 135 ° C., and the engaging region is raised. It is described in Patent Document 4 that the treated non-woven fabric is used for the outer surface back sheet.
  • the present invention has an air-through nonwoven fabric containing thermoplastic fibers and having a plurality of heat-sealed portions in which the intersections of the fibers are heat-sealed.
  • the non-woven fabric of the present invention is preferably a non-woven fabric for absorbent articles.
  • the non-woven fabric of the present invention preferably contains molten fibers having melt traces that have lost their fiber morphology due to melt solidification of the thermoplastic fibers.
  • the melting trace portion is preferably formed in a portion other than the heat-sealing portion.
  • the non-woven fabric for absorbent articles of the present invention On at least one surface of the non-woven fabric for absorbent articles of the present invention, five observation regions of 500 ⁇ m ⁇ 400 ⁇ m are observed at a magnification of 200 times, and the molten fiber having the melting trace portion existing in each observation region is observed.
  • the total number of the observed molten fibers is preferably 5 or more.
  • FIG. 1 is an example of an observation image in which one surface of the non-woven fabric for absorbent articles of the present invention is observed using a scanning electron microscope.
  • FIG. 2 is a cross-sectional view showing an embodiment of a melting trace portion according to the present invention.
  • FIG. 3 is another example of the observation image corresponding to FIG. 4 (a) to 4 (c) are schematic views for explaining a method of measuring raised fibers per unit area.
  • Patent Documents 1 to 4 do not disclose a technique for ensuring sufficient adhesiveness with respect to an air-through nonwoven fabric.
  • the present invention relates to a non-woven fabric for absorbent articles, which is an air-through non-woven fabric having excellent adhesiveness, and an absorbent article including the non-woven fabric for absorbent articles.
  • the non-woven fabric for absorbent articles of the present embodiment (hereinafter, also simply referred to as “nonwoven fabric”) is an air-through non-woven fabric.
  • the "air-through non-woven fabric” refers to a non-woven fabric produced through a step (air-through step) of blowing a fluid having a temperature equal to or higher than a predetermined temperature, for example, hot air such as air or water vapor, onto a fiber web or a non-woven fabric which is a precursor of the non-woven fabric.
  • the spraying of such a fluid is performed by a so-called air-through method (penetration method) in which a fluid such as hot air penetrates the fiber web or the non-woven fabric.
  • the air-through non-woven fabric of the present invention includes not only the non-woven fabric produced only by the heat treatment step by the air-through method, but also the non-woven fabric manufactured by adding the heat treatment step to the non-woven fabric produced by another method, or after the air-through step. Nonwoven fabrics manufactured by performing some process are included.
  • FIG. 1 shows an electron microscope image (observation magnification 200 times) of one surface of the non-woven fabric of the present embodiment taken according to ⁇ Method for measuring the number of observed molten fibers> described later.
  • the non-woven fabric of the present embodiment has a plurality of heat-sealed portions P in which the intersections of the thermoplastic fibers contained as constituent fibers are heat-sealed due to the manufacturing method thereof, similarly to the ordinary air-through non-woven fabric.
  • the portion with the reference numeral P in FIG. 1 is the heat-sealing portion.
  • the non-woven fabric of the present embodiment contains a molten fiber F1 having a melt trace portion T whose fiber form has been lost due to melt solidification of the thermoplastic fiber.
  • the melting trace portion T is a melt-solidified portion formed in a portion other than the heat-sealed portion P. That is, the molten fiber F1 has a portion that has been melt-solidified and a portion that has not been melt-solidified, other than the heat-sealed portion P.
  • the melting trace portion T is a portion in which the original shape of the fiber is deformed by melting and solidifying.
  • the original shape of the fiber is usually produced by extruding the resin with a circular nozzle during the production of thermoplastic fiber, so the cross-sectional shape is close to a perfect circle, and at least the cross-sectional shape has a curvature.
  • the non-woven fabric of the present embodiment may have a fiber having no melting trace portion T together with the molten fiber F1.
  • the non-woven fabric of the present embodiment has two surfaces separated in the thickness direction along the direction orthogonal to the thickness direction of the non-woven fabric.
  • the surface of the nonwoven fabric is usually a surface of the absorbent article that faces the skin of the wearer (skin facing surface) or that of the wearer. It is a surface facing the opposite side of the skin (non-skin facing surface) or a surface facing clothing such as shorts (clothing facing surface).
  • the non-woven fabric of the present embodiment observes five observation regions of 500 ⁇ m ⁇ 400 ⁇ m at a magnification of 200 times on at least one of the above two surfaces.
  • the number of molten fibers F1 (hereinafter, also referred to as “observed molten fibers F1”) having a melting trace portion T existing in each observation region is counted.
  • the total number of observed molten fibers observed in the five observation regions is 5 or more.
  • “the total number of observed molten fibers observed in the five observation regions” is simply referred to as "the total number of observed molten fibers”.
  • the number of such observed molten fibers F1 is measured by the following method.
  • the fibers located on the outermost surface of the surface to be photographed of the measurement sample are focused. For one measurement sample, five points having different positions from each other are photographed to obtain a total of five SEM images. Then, in each SEM image, the focused fibers are selected, and the molten fibers having a melting trace portion are counted from these fibers.
  • a "focused fiber” is a fiber whose contour is not blurred within the observation area. Fibers whose melting traces are indistinguishable shall not be included in the count. When a plurality of melt trace portions T are formed on one fiber, the melt fiber F1 is counted as one.
  • the molten fibers are counted in each SEM image, and the total of these is taken as the total number of observed molten fibers, that is, the total number of molten fibers having a melting trace portion T in the five observation regions.
  • the non-woven fabric to be measured constitutes an absorbent article
  • the non-woven fabric is obtained by solidifying the hot melt adhesive with cold spray or liquid nitrogen and carefully peeling off the non-woven fabric. This means is common to other measurements herein.
  • the total number of observed molten fibers will be specifically described with reference to FIG. 1 as a method of counting the observed molten fibers in each SEM image.
  • the fibers located on the outermost surface focused in the SEM image and the fibers focused in the image are selected.
  • the fiber a1 is the fiber located on the outermost surface, and the fiber a1 and the fiber in focus are selected together with the fiber a1.
  • the fibers a1 to a6 having the melting trace portion T are selected from the focused fibers.
  • the fiber a2 has melt trace portions T1 and T2
  • the fiber a5 has melt trace portions T3 and T4. Similar selections and judgments are made for all of the "focused fibers" in the same SEM image. Therefore, the total number of observed molten fibers in FIG. 1 is 6.
  • the non-woven fabric of the present embodiment has the molten fiber F1 on one of the surfaces thereof.
  • the melting trace portion T extends in the plane direction. Therefore, when another constituent member of the absorbent article is adjacent to this surface, the contact area with the other constituent member in the plane direction is larger than that of the fiber having no melting trace portion T.
  • the adhesiveness is improved by increasing the contact area between the fiber and other constituent members due to the melting trace portion T.
  • the total number of observed molten fibers is 5 or more, a sufficient adhesive area can be secured on the surface of the non-woven fabric, so that the surface is excellent in adhesiveness.
  • the surface in which the total number of observed molten fibers is 5 or more is made into a contact surface with other constituent members of the absorbent article, thereby forming the non-woven fabric. And other constituent members are well adhered to each other, and the moldability or strength of the absorbent article can be ensured.
  • the total number of observed molten fibers is preferably 5 or more, more preferably 10 or more. Further, the total number of observed molten fibers is actually 100 or less, or 50 or less, considering the number of fibers constituting the non-woven fabric. The total number of observed molten fibers is preferably 5 or more and 100 or less, and more preferably 10 or more and 50 or less.
  • the melt-solidified portion of the melt trace portion T tends to be flat and flattened as compared with the non-melt-solidified portion.
  • the melt trace portion T has a straight portion a and a curved portion b, for example, as shown in FIG. 2, in which the contour of the cross section orthogonal to the direction in which the molten fiber extends is formed.
  • This straight line portion a can be a portion extending in the plane direction. That is, the melting trace portion T has a straight portion on the contour of its cross section.
  • the straight line portion a faces the outward side in the thickness direction of the non-woven fabric, and the curved portion b is in the thickness direction. It is preferable that it faces inward.
  • FIG. 3 shows another example of the nonwoven fabric of the present invention, which is an image (SEM image) of an observation region corresponding to FIG. 1 of the nonwoven fabric.
  • the melting trace portion T in the molten fiber F1 is formed as a wide flat portion as compared with the portion not melted and solidified.
  • the melt trace portion T10 in FIG. 3 has an irregular contour and extends outward from the contour of the fiber in the portion where the melt is not solidified.
  • Such a melting trace portion T10 has the above-mentioned straight line portion a and curved portion b in the contour of the cross section orthogonal to the direction in which the molten fiber extends (not shown).
  • the non-woven fabric may have a total number of observed molten fibers of 5 or more on any one surface. For example, when the total number of the above-mentioned observed molten fibers is measured for each of both sides of the non-woven fabric, it is sufficient that one of the surfaces has 5 or more fibers. From the viewpoint of texture, the other surface of the non-woven fabric is preferably 20 or less.
  • molten fibers F1 are present on both sides of the non-woven fabric, and the total number of observed molten fibers is different from each other on both sides.
  • the surface on which the total number of observed molten fibers is large is referred to as the first surface
  • the surface on which the total number of observed molten fibers is small is referred to as the second surface.
  • the ratio of the total number of observed molten fibers on the first surface to the second surface is preferable. It is 1.5 times or more, more preferably 2 times or more.
  • the upper limit of the ratio is not particularly limited, but when the total number of observed molten fibers on the second surface is 1 or more, it is preferably 10 times or less, more preferably 5 times or less.
  • the ratio is preferably 1.5 times or more and 10 times or less, and more preferably 2 times or more and 5 or less.
  • the total number of observed molten fibers on the second surface is preferably 50 or less, more preferably 20 or less, and most preferably 0. That is, the total number of observed molten fibers on the second surface is 0 or more.
  • the total number of observed molten fibers on the first surface is larger than that on the second surface, whereby the first surface has less fluffing than the second surface.
  • the degree of fluffing can be evaluated by the number of raised fibers per unit area below. It can be evaluated that the smaller the number of raised fibers per unit area, the less the fluffing. From the viewpoint of achieving a better balance between texture and texture, the number of raised fibers per unit area is preferably 20 or less. When the number of such raised fibers is 10 or less, fluffing becomes less noticeable in appearance. Further, from the viewpoint of further improving the adhesiveness, the number of raised fibers per unit area is preferably 5 or less.
  • FIG. 4 is a schematic view showing a method of measuring the number of raised fibers among the fibers constituting the non-woven fabric in an environment of 22 ° C. and 65% RH.
  • a 10 cm ⁇ 10 cm measuring piece 104 is cut out from the non-woven fabric with a sharp razor. If a 10 cm x 10 cm measuring piece cannot be cut out from the non-woven fabric, the size is 7 cm x 7 cm.
  • the measurement piece 104 is folded into a mountain fold and placed on an A4 size black mount (not shown).
  • FIG. 4 is a schematic view showing a method of measuring the number of raised fibers among the fibers constituting the non-woven fabric in an environment of 22 ° C. and 65% RH.
  • an A4 size black mount 101 having a hole 107 having a length of 1 cm and a width of 1 cm is placed on the measurement piece 104 on the mount.
  • the crease 105 of the measurement piece 104 is arranged so as to be visible from the hole 107 of the upper black mount.
  • "Kenran (black) ream weight 265 g" of Fuji Kyowa Paper Co., Ltd. can be used for the mounts arranged above and below the measurement piece 104.
  • the mount 101 is shown in white for convenience of explanation.
  • two 50 g weights 102 are placed on the mount 101 arranged on the measurement piece 104.
  • the weight is located on the crease 105 of the measurement piece 104 and at a position 5 cm away from each of the both side edges of the holes 107 of the mount 101 arranged on the measurement piece 104 in the direction along the crease 105. Place 102. As a result, the measuring piece 104 is in a completely folded state.
  • the inside of the hole 107 of the mount is observed at a magnification of 30 times using a microscope (“VHX-900” manufactured by KEYENCE CORPORATION). Based on such observation, the number of fibers whose tips are located above the virtual line 108 which is translated 1 mm upward from the crease 105 of the measurement piece 104 is counted as the number of raised fibers.
  • the fiber when there is a fiber 106a that crosses the virtual line 108 twice, the fiber is counted as two.
  • the number of brushed fibers is six.
  • the number of brushed fibers is counted for nine measuring pieces cut out from the non-woven fabric, and the average of these (rounded off to the second minority) is taken as the number of brushed fibers per unit area (1 cm x 1 cm). Ask.
  • the number of raised fibers per unit area on the first surface is preferably 10 or less, more preferably 5 or less, and 0. Is the most preferable. That is, the number of raised fibers per unit area on the first surface is 0 or more.
  • the number of raised fibers per unit area on the second surface is conditioned on being larger than that of the first surface.
  • the number is preferably 20 or less, and more preferably 10 or less. Further, the number of raised fibers per unit area on the second surface is more than 0.
  • the adhesive strength of the first surface is preferably 0.13N or more, more preferably 0.15N or more. Further, the adhesive strength of the first surface is practically 5N or less or 3N or less, and preferably 0.13N or more and 5N or less, more preferably 0.15N or more and 3N or less. Adhesive strength is measured by the following method.
  • a hot melt adhesive having a basis weight of 6 g / m 2 (manufactured by Henkel, rubber-based hot melt) in a region of 5 cm ⁇ 5 cm on one end side in the longitudinal direction of the test piece.
  • each of the ends of the measurement sample on which the two test pieces are not bonded is fixed between the chucks of the Tensilon universal tester (“RTG1310” manufactured by A & D Co., Ltd.). The distance between the chucks is 50 mm.
  • the chuck is moved along the 180 ° direction at a speed of 300 mm / min to peel off the two test pieces. The maximum value of the tensile strength observed at this time is obtained. Such measurement is repeated 3 times, and the average value thereof is taken as the adhesive strength.
  • the basis weight of the non-woven fabric is preferably 8 g / m 2 or more, more preferably 12 g / m 2 or more.
  • the basis weight of the non-woven fabric is practically preferably 50 g / m 2 or less, more preferably 30 g / m 2 or less.
  • the basis weight of the non-woven fabric is preferably 8 g / m 2 or more and 50 g / m 2 or less, and more preferably 12 g / m 2 or more and 30 g / m 2 or less.
  • the average fiber diameter of the constituent fibers of the non-woven fabric is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the average fiber diameter of the constituent fibers of the non-woven fabric is actually 5 ⁇ m or more, preferably 8 ⁇ m or more.
  • the average fiber diameter of the constituent fibers of the non-woven fabric is preferably 5 ⁇ m or more and 20 ⁇ m or less, and more preferably 8 ⁇ m or more and 15 ⁇ m or less.
  • the non-woven fabric may be composed of a plurality of types of fibers having different fiber diameters, but from the same viewpoint as described above, it is preferably composed of constituent fibers having a fiber diameter of 20 ⁇ m or less.
  • the "average fiber diameter" is the average of the fiber diameters of the constituent fibers in the entire nonwoven fabric.
  • the fiber diameter of the constituent fibers of the non-woven fabric is determined by the following method.
  • the SEM image of the non-woven fabric obtained in the above-mentioned ⁇ Method for measuring the number of observed molten fibers> is used.
  • an arbitrary portion other than the melting trace portion T and the heat fusion portion P is selected, and a line orthogonal to the longitudinal direction of the fiber in the selected portion is drawn.
  • the transfer length of the fibers along the orthogonal lines is measured as the fiber diameter.
  • the transfer line indicating the transfer length that is, the line orthogonal to the longitudinal direction of the fiber and the line indicating the contour of the fiber are measured at positions orthogonal to each other.
  • the arithmetic mean value of the fiber diameter is obtained for the 10 fibers for each of a total of 5 SEM images obtained from the measurement sample.
  • Such an arithmetic mean value is obtained for each of both sides of the non-woven fabric, and the average of these values is taken as the average fiber diameter. Even when fibers having different fiber diameters are contained, the measurement is performed as described above.
  • the non-woven fabric of the present embodiment is typically mainly composed of thermoplastic fibers.
  • the proportion of the thermoplastic fiber in the total constituent fibers of the nonwoven fabric of the present embodiment is at least 50% by mass or more, preferably 90% by mass or more, and may be 100% by mass.
  • thermoplastic resin examples include polyolefins such as polyethylene (PE) and polypropylene (PP); polyesters such as polyethylene terephthalate (PET); polyamides such as nylon 6 and nylon 66; polyacrylic acid.
  • PE polyethylene
  • PET polypropylene
  • PET polyesters
  • nylon 6 and nylon 66 polyamides
  • polyacrylic acid examples thereof include alkyl esters, polymethacrylic acid alkyl esters, polyvinyl chloride, and polyvinylidene chloride, and one of these can be used alone or in combination of two or more.
  • Synthetic fibers such as thermoplastic fibers used for the non-woven fabric of the present embodiment may be single fibers made of one kind of synthetic resin or a blend polymer in which two or more kinds of synthetic resins are mixed, or may be composite fibers.
  • the composite fiber referred to here is a synthetic fiber obtained by combining two or more kinds of synthetic resins having different components with a spinneret and spinning them at the same time, and has a structure in which a plurality of components are continuous in the length direction of the fiber. Those that are mutually bonded in the fiber.
  • Examples of the form of the composite fiber include a core-sheath type having a core-sheath structure composed of a core portion and a sheath portion, a side-by-side type, and the like.
  • the thermoplastic fiber preferably contains polyethylene as a constituent resin, more preferably at least the surface of the thermoplastic fiber, and further preferably made of polyethylene.
  • the resin component of the core portion is one or more selected from the group consisting of PE and PP, and the resin of the sheath portion. Examples thereof include those in which the component is PE.
  • the resin component of the core portion is PET and the resin component of the sheath portion is PE.
  • the non-woven fabric of the present embodiment may contain fibers other than the thermoplastic fibers in addition to the thermoplastic fibers.
  • examples of such other fibers include natural fibers such as pulp and cotton, cellulosic fibers such as rayon, lyocell, and tencel, and one of these fibers may be used alone or in combination of two or more. Can be done.
  • the non-woven fabric preferably contains cotton as a natural fiber.
  • the non-woven fabric preferably contains one or more selected from the group consisting of rayon and tencel as the cellulosic fiber.
  • the content of each of the other fibers and the thermoplastic fiber in the non-woven fabric is preferably within the following range.
  • the ratio of the content of the other fiber to the total content of the other fiber and the thermoplastic fiber in the non-woven fabric is preferably 0.1% or more, more preferably 1% or more.
  • the ratio is preferably 20% or less, more preferably 10% or less.
  • the ratio is preferably 0.1% or more and 20% or less, and more preferably 1% or more and 10% or less.
  • Such a ratio is a value (mass%) obtained by dividing the mass of other fibers in the total constituent fibers of the nonwoven fabric by the total mass of the other fibers and the thermoplastic fibers in the total constituent fibers of the nonwoven fabric.
  • the non-woven fabric of this embodiment is for an absorbent article and is used as a constituent member of the absorbent article.
  • absorbent article as used herein broadly includes articles used for absorbing body fluids (urine, loose stool, menstrual blood, sweat, etc.) discharged from the human body, and includes, for example, disposable diapers, sanitary napkins, and sanitary napkins. Includes shorts, incontinence pads, etc.
  • Absorbent articles typically have a liquid-permeable surface sheet located relatively close to the wearer's skin and a liquid-impermeable surface sheet located relatively far from the wearer's skin. Alternatively, it is provided with a liquid-impermeable or water-repellent back sheet and a liquid-retaining absorber disposed between the two sheets.
  • the absorbent article may include an exterior body that forms its outer surface.
  • the non-woven fabric of the present embodiment is suitably provided as a constituent member in an absorbent article. From the viewpoint of more reliably ensuring the moldability or strength of the absorbent article, the nonwoven fabric is arranged so that the surface having a total number of observed molten fibers of 5 or more becomes an adhesive surface with other constituent members. Is preferable.
  • the second surface of the non-woven fabric of the present embodiment is fluffy rather than the first surface, it is also suitable as a constituent member that can come into direct contact with the wearer's skin.
  • it is suitable as a back sheet or an exterior body that forms the outer surface of the absorbent article.
  • the non-woven fabric in the absorbent article, is arranged so that the surface in which the total number of observed molten fibers is 5 or more is preferably 5 or more, and more preferably the first surface faces the non-skin facing surface side.
  • the absorbent article in which the non-woven fabric of the present embodiment is used may be provided with the non-woven fabric as either or both of the front surface sheet and the back surface sheet.
  • the absorbent article preferably includes the non-woven fabric of the present embodiment as a back sheet.
  • the back surface sheet is preferably made of a laminated sheet of a liquid impervious sheet and the non-woven fabric.
  • the non-woven fabric of the present embodiment is basically composed of a single-layered non-woven fabric obtained by the air-through method, but when used as a constituent member of an absorbent article, other non-woven fabrics, films and the like are used. It may be in a state of being laminated with the sheet material of.
  • This manufacturing method includes a heat treatment step of blowing hot air into a fiber web containing thermoplastic fibers by an air-through method.
  • the heat treatment step is a step of forming a non-woven fabric by fusing the intersections of the constituent fibers of the fiber web to form a heat-sealed portion.
  • the fiber web is typically produced by opening a raw material fiber such as a thermoplastic fiber with a fiber opening machine and converting the opened raw material fiber into a web with a card machine.
  • a raw material fiber such as a thermoplastic fiber with a fiber opening machine
  • the basis weight of the fiber web is adjusted to the range of the basis weight of the above-mentioned non-woven fabric.
  • the fiber web may be formed by laminating or mixing a plurality of types of fibers having different fiber diameters.
  • the obtained fiber web is placed on, for example, a resin mesh belt, a metal endless net made of wire mesh, a metal plate with vents, or a metal plate without vents.
  • a resin mesh belt By placing and blowing hot air or steam from the fiber web side, the intersections of the fibers are heat-sealed.
  • the obtained non-woven fabric is formed with two surfaces, a surface facing the plate or net (hereinafter, also referred to as a non-sprayed surface) and a surface for which hot air is sprayed (hereinafter, also referred to as a sprayed surface).
  • a large amount of molten fiber F1 is formed on one surface, and the surface becomes the first surface and the other surface becomes the second surface.
  • the sprayed surface is the first surface and the non-sprayed surface is the second surface.
  • the temperature of the hot air in the normal air-through treatment is set in a range about 10 ° C. higher than the lowest melting point of the constituent fibers in the fiber web (for example, the melting point in the sheath portion of the core-sheath type composite fiber), but melts.
  • the temperature difference between the temperature of the hot air and the minimum melting point of the constituent fibers is preferably 5 ° C. or higher, more preferably 10 ° C. or higher.
  • the temperature difference between the temperature of the hot air and the minimum melting point of the constituent fibers is practically preferably 70 ° C. or lower, more preferably 50 ° C. or lower.
  • the temperature difference between the temperature of the hot air and the minimum melting point of the constituent fibers is preferably 5 ° C. or higher and 70 ° C. or lower, and more preferably 10 ° C. or higher and 50 ° C. or lower.
  • the lowest melting point of the constituent fibers refers to the melting point of the lowest melting point among the resins when the fibers have a plurality of types of resins such as core-sheath type composite fibers. In the case of a resin that does not have a definite melting point, it refers to the softening point.
  • the wind speed of the hot air blown to the fiber web in the heat treatment step is preferably within the following range.
  • the wind speed of the hot air blown onto the fiber web in the heat treatment step is preferably 0.3 m / sec or more, more preferably 0.5 m / sec or more, still more preferably 0.8 m / sec or more.
  • the wind speed of the hot air is preferably 10 m / sec or less, more preferably 5 m / sec or less, still more preferably 3 m / sec or less.
  • the time for blowing hot air onto the fiber web may be about the same as that of the conventional method for producing an air-through non-woven fabric, but from the same viewpoint as above, the heat treatment time is preferably 1 second or more. , More preferably 3 seconds or more. Further, from the viewpoint of increasing the production speed as much as possible and reducing the production cost, the heat treatment time is preferably 60 seconds or less, more preferably 30 seconds or less. The heat treatment time is preferably 1 second or more and 60 seconds or less, and more preferably 3 seconds or more and 30 seconds or less.
  • a treatment of heating only one side of the fiber web to a high temperature and pressurizing from the other side may be performed.
  • Examples of such a treatment method include a method in which a fiber web is placed on a hot plate and the fiber web is pressed from a surface opposite to the hot plate.
  • the same configuration as the high temperature pressurization step described later can be adopted.
  • the non-woven fabric obtained by the heat treatment step may be further subjected to a high temperature pressurization step in which the non-woven fabric is pressurized in the thickness direction while being heated.
  • a high temperature pressurization step in which the non-woven fabric is pressurized in the thickness direction while being heated.
  • the high temperature pressurization step can be performed, for example, by pressurizing the non-woven fabric between two heated metal plates.
  • the nonwoven fabric may be subjected to a pressurized load from both of the two plates, or may be subjected to a pressurized load from either plate.
  • the high temperature pressurization step is preferably performed under the following conditions.
  • the heating temperature of the non-woven fabric in the high temperature pressurization step is preferably 120 ° C. or higher, more preferably 130 ° C. or higher, still more preferably 135 ° C. or higher, still more preferably 136 ° C. or higher, still more preferably 140 ° C. or higher.
  • the heating temperature of the non-woven fabric is preferably 180 ° C. or lower, more preferably 160 ° C. or lower.
  • the heating temperature of the non-woven fabric is preferably 120 ° C. or higher and 180 ° C. or lower, more preferably 130 ° C. or higher and 160 ° C. or lower, still more preferably 135 ° C.
  • Such a heating temperature is, for example, the temperature of the plate of the two metal plates that applies a pressurized load to the non-woven fabric.
  • the pressurizing load applied to the non-woven fabric in the high temperature pressurizing step is preferably 15 N / cm 2 or more, more preferably 30 N / cm 2 or more.
  • the pressurized load is preferably 200 N / cm 2 or less, more preferably 100 N / cm 2 or less.
  • the applied load is preferably 15N / cm 2 or more 200 N / cm 2 or less, more preferably 30 N / cm 2 or more 100 N / cm 2 or less.
  • the treatment time for pressurizing the non-woven fabric while heating in the high-temperature pressurizing step is preferably 2 seconds or longer, more preferably 3 seconds or longer.
  • the processing time is preferably 10 seconds or less, more preferably 8 seconds or less.
  • the processing time is preferably 2 seconds or more and 10 seconds or less, and more preferably 3 seconds or more and 8 seconds or less.
  • the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment and can be appropriately modified. Further, the above-described embodiments may be combined. For example, in the non-woven fabric in the above-described embodiment, the molten fiber F1 is present on both sides thereof, but the molten fiber F1 may be present only on one of the surfaces.
  • Example 1 As the raw material fiber, a 2.0 dtex thermoplastic fiber composed of concentric core-sheath type composite fibers (core-sheath ratio 50% by mass: 50% by mass) having a core component of PET and a sheath component of PE was used. Such raw material fibers had a minimum melting point of 120 ° C. Using this raw material fiber, a fiber web is manufactured according to a conventional method using a known card machine, and the fiber web is placed on a metal plate preheated to 136 ° C., and hot air is blown by an air-through method. An air-through non-woven fabric was produced by performing a spraying heat treatment step. The heat treatment conditions in the heat treatment step (air-through treatment) are as shown in Table 1.
  • Example 2 An air-through nonwoven fabric was produced on a resin mesh belt using the same fibers as in Example 1. After that, a high temperature pressurization step was performed. The treatment conditions for the high temperature pressurization step were as shown in Table 1. In the high-temperature pressurization step, a non-woven fabric is placed on a metal plate heated to 150 ° C. with the spray surface facing down, and then a metal weight is placed on the non-woven fabric at 30 cN / cm 2 . Pressurization was performed for 5 seconds.
  • Example 3 An air-through nonwoven fabric was produced by performing a high-temperature pressurization step after the heat treatment step by the same method as in Example 2 except that raw material fibers having different fineness were used.
  • Example 4 An air-through nonwoven fabric was produced by performing a high-temperature pressurization step after the heat treatment step by the same method as in Example 2 except that the wind speed of the hot air and the temperature of the hot air were different.
  • a fiber web (hereinafter, """1.2 dtex fiber web") and 2.0 dtex thermoplastic with a core component of PET and a sheath component of PE and concentric core-sheath type composite fibers (core-sheath ratio 50% by mass: 50% by mass).
  • the fiber diameter of the raw material fiber of the 1.2 dtex fiber web was 11.9 ⁇ m, and the fiber diameter of the raw material fiber of the 2.0 dtex fiber web was 15.2 ⁇ m.
  • An air-through nonwoven fabric was produced by performing a high-temperature pressurization step after the heat treatment step by the same method as in Example 4 except that the laminated web was used. In the heat treatment step, the heat treatment was performed so that the 2.0 dtex fiber web side of the laminated web became the spray surface.
  • Example 6 An air-through nonwoven fabric was produced by the same method as in Example 4 except that raw material fibers having different fineness were used.
  • Example 7 Using the same fibers as in Example 3, cotton manufactured by Marusan Sangyo Co., Ltd. was further mixed with 1/12 of the mass of the core-sheath type composite fiber to prepare a fiber web. Then, by the same method as in Example 4, a high temperature pressurization step was performed after the heat treatment step to produce an air-through nonwoven fabric.
  • Example 8 Using the same fibers as in Example 1, Marusan Sangyo cotton was further mixed with 1/12 of the mass of the core-sheath type composite fiber to prepare a fiber web. Then, by the same method as in Example 4, a high temperature pressurization step was performed after the heat treatment step to produce an air-through nonwoven fabric.
  • Comparative Example 1 an air-through nonwoven fabric was produced by the same method as in Example 1 except that raw material fibers having different fineness were used.
  • the fiber diameter of the raw material fiber of Comparative Example 1 was 15.5 ⁇ m.
  • Comparative Examples 2 and 3 In Comparative Example 2, an air-through nonwoven fabric was produced by the same method as in Example 4, and in Comparative Example 3, an air-through nonwoven fabric was produced by the same method as in Example 6, except that the high-temperature pressurization step was not performed.
  • Comparative Examples 5 and 6 In Comparative Example 5, an air-through nonwoven fabric was produced by the same method as in Example 6, except that the high-temperature pressurization step was not performed, and in Comparative Example 6, the basis weight was reduced and the air-through nonwoven fabric was produced by the same method as in Example 4. Manufactured.
  • Table 1 shows the fiber diameters measured according to the method described above for the non-woven fabrics of Examples and Comparative Examples.
  • Examples for example, Examples 1 and 2 and Comparative Examples in which the same raw material fibers are used
  • the fiber diameters may be slightly different in Table 1, but this is a slight deviation from the measured values of the measurement. Due to the occurrence of.
  • the total number of observed molten fibers was measured on both sides of the air-through nonwoven fabrics of Examples and Comparative Examples, that is, on the non-sprayed surface and the sprayed surface, respectively, by the method described above.
  • Example 1 the number of times the non-sprayed surface was sprayed was determined as the ratio of the number of molten fibers. .. Regarding the total number of observed molten fibers of Examples 2 to 8, Comparative Example 1, Comparative Example 3, and Comparative Example 4, the number of times the sprayed surface was the non-sprayed surface was determined as the ratio of the number of molten fibers. .. Further, in Example 1, the non-sprayed surface was used, and the other sprayed surface was used as the adhesive surface, and the adhesive strength was measured by the method described above. The measurement results are shown in Table 1.
  • the total number of observed molten fibers on either the sprayed surface or the non-sprayed surface is 5 or more, and the raised fibers per unit area on the sprayed surface. The result was that the number of fibers was small.
  • the total number of observed molten fibers was less than 5 on both the sprayed surface and the non-sprayed surface. Further, in the examples in which the total number of observed molten fibers was 5 or more, the adhesive strength of the adhesive surfaces was higher than that in the comparative example. From these results, it was shown that the non-woven fabric in the examples had a surface having excellent adhesiveness.
  • a non-woven fabric for an absorbent article which is an air-through nonwoven fabric having excellent adhesiveness, and an absorbent article including the non-woven fabric for an absorbent article.

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  • Public Health (AREA)
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  • Absorbent Articles And Supports Therefor (AREA)
PCT/JP2021/007205 2020-02-27 2021-02-25 吸収性物品用不織布及びこれを備える吸収性物品 WO2021172475A1 (ja)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2003265528A (ja) * 2002-03-15 2003-09-24 Daio Paper Corp 使い捨て紙おむつ
WO2006135011A1 (ja) * 2005-06-15 2006-12-21 Daio Paper Corporation 使い捨ておむつ
JP2012067426A (ja) * 2010-09-27 2012-04-05 Uni Charm Corp 不織布、及び上記不織布を含む吸収性物品、並びに上記不織布の形成方法
US20130337714A1 (en) * 2012-06-13 2013-12-19 Ahlstrom Coporation Glazed Nonwoven Fabric and Methods of Manufacture
JP2019127665A (ja) * 2018-01-24 2019-08-01 ハビックス株式会社 吸水収縮性不織布

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Publication number Priority date Publication date Assignee Title
JP4145203B2 (ja) * 2003-06-17 2008-09-03 花王株式会社 吸収性物品
JP4518906B2 (ja) * 2004-10-20 2010-08-04 花王株式会社 吸収性物品用の表面シート
CN106460241B (zh) * 2014-04-18 2020-03-17 大和纺控股株式会社 吸收性物品用复合短纤维、其制造方法、吸收性物品用热粘接无纺布、吸收性物品用表面片材和吸收性物品
JP5997404B1 (ja) * 2016-03-30 2016-09-28 大王製紙株式会社 吸収性物品の伸縮構造及びその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003265528A (ja) * 2002-03-15 2003-09-24 Daio Paper Corp 使い捨て紙おむつ
WO2006135011A1 (ja) * 2005-06-15 2006-12-21 Daio Paper Corporation 使い捨ておむつ
JP2012067426A (ja) * 2010-09-27 2012-04-05 Uni Charm Corp 不織布、及び上記不織布を含む吸収性物品、並びに上記不織布の形成方法
US20130337714A1 (en) * 2012-06-13 2013-12-19 Ahlstrom Coporation Glazed Nonwoven Fabric and Methods of Manufacture
JP2019127665A (ja) * 2018-01-24 2019-08-01 ハビックス株式会社 吸水収縮性不織布

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