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WO2021215492A1 - Tissu non tissé pour l'hygiène, produit hygiénique et article absorbant pourvu de celui-ci, et procédé de fabrication de tissu non tissé pour l'hygiène - Google Patents

Tissu non tissé pour l'hygiène, produit hygiénique et article absorbant pourvu de celui-ci, et procédé de fabrication de tissu non tissé pour l'hygiène Download PDF

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Publication number
WO2021215492A1
WO2021215492A1 PCT/JP2021/016278 JP2021016278W WO2021215492A1 WO 2021215492 A1 WO2021215492 A1 WO 2021215492A1 JP 2021016278 W JP2021016278 W JP 2021016278W WO 2021215492 A1 WO2021215492 A1 WO 2021215492A1
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WO
WIPO (PCT)
Prior art keywords
sanitary
fiber
woven fabric
fibers
polyethylene resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/016278
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English (en)
Japanese (ja)
Inventor
奈都美 小林
裕太 寒川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kao Corp filed Critical Kao Corp
Priority to CN202180029359.XA priority Critical patent/CN115427621B/zh
Publication of WO2021215492A1 publication Critical patent/WO2021215492A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—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 of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from 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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series

Definitions

  • the present invention relates to a non-woven fabric for hygiene, a sanitary product and an absorbent article provided with the non-woven fabric for hygiene, and a method for producing the non-woven fabric for hygiene.
  • Patent Document 1 discloses a comfort fabric intended to be used for clothing for eliminating the feeling of heat in summer.
  • This cloth contains at least one kind of organic polymer fiber having a thermal conductivity of 5 W / mK or more in the fiber axis direction from 20 ° C. to 30 ° C., and has a thermal conductivity in the thickness direction of the cloth from 20 ° C. to 30 ° C.
  • the contact cold temperature feeling is 0.13 W / cm 2 or more at 08 W / mK or more.
  • Patent Document 2 discloses a sheet-like fiber bundle aggregate which is excellent in cool contact characteristics and is used for bedding and rugs. This aggregate is formed by laminating a plurality of sheet-like materials containing high molecular weight polyethylene fibers having an average fiber length of 10 to 200 mm.
  • This sheet contains hydrophobic fibers and cellulosic fibers, and has a cool contact feeling q max of 2.5 kW / m 2 or less on both sides of the sheet when the water content is 50% by mass.
  • Japanese Unexamined Patent Publication No. 2010-236130 Japanese Unexamined Patent Publication No. 2018-1455777 Japanese Unexamined Patent Publication No. 2019-42403
  • the present invention relates to a sanitary nonwoven fabric.
  • the sanitary nonwoven fabric contains fibers whose surface is at least partly made of polyethylene resin.
  • the volume filling rate of the sanitary nonwoven fabric is preferably 3.5% or more.
  • the present invention also relates to an absorbent article comprising the sanitary nonwoven fabric.
  • the present invention also relates to a hygienic product comprising the non-woven fabric for hygiene.
  • the sanitary product comprises a second member arranged adjacent to the sanitary nonwoven fabric.
  • the second member has a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
  • the present invention relates to a method for producing a sanitary non-woven fabric, which obtains a fiber aggregate by performing an air-through treatment on a web of fibers having at least a part of the surface made of polyethylene resin.
  • the fiber aggregates are preferably consolidated.
  • Hygiene products such as absorbent articles used to absorb liquid discharged from the body such as sanitary napkins and panty liners are composed by combining a plurality of constituent members including non-woven fabric.
  • the wearer may perceive a feeling of warmth and may be reminded of discomfort such as stuffiness during use. This can be especially noticeable in hot environments. Therefore, it is desirable that the part of the hygienic product such as an absorbent article that comes into contact with the skin is configured to perceive a feeling of coldness.
  • Patent Documents 1 and 2 are applied to articles other than hygienic products such as clothing and bedding, and their application to hygienic products has not been studied at all.
  • Patent Document 3 The technique described in Patent Document 3 is less likely to cause discomfort even when it comes into contact with the skin in a wet state, but it improves the reduction of discomfort before using an absorbent article, when wearing it, and before absorbing liquid. There was room.
  • the present invention relates to a sanitary non-woven fabric that gives a comfortable feeling of use by perceiving a feeling of coldness when touching the skin, and a sanitary product and an absorbent article provided with the non-woven fabric for hygiene.
  • the non-woven fabric for hygiene of the present invention is suitably used as a constituent member of a sanitary product.
  • Typical examples of hygienic products are hygienic products such as face masks and eye masks, and absorbent products that absorb body fluids such as urine and menstrual blood, and are preferably absorbent products.
  • the hygienic non-woven fabric is placed on the skin contact surface side, which is the surface that comes into contact with the wearer's skin when wearing the hygiene product, or is placed on the part that comes into contact with the user's hand when handling the hygiene product. Or something.
  • the sanitary nonwoven fabric is not particularly limited to the uses described herein and is applicable.
  • the sanitary nonwoven fabric of the present invention is a fiber sheet containing fibers whose surface is at least partly made of polyethylene resin, and is preferably composed of only the fibers.
  • the constituent fibers of the sanitary nonwoven fabric maintain the morphology of the fiber sheet by at least one of entanglement, fusion and pressure bonding. Therefore, the sanitary nonwoven fabric of the present invention is mainly composed of a form in which the boundaries between the constituent fibers that come into contact with each other are clear.
  • the fibers contained in the sanitary non-woven fabric have polyethylene resin on at least a part of the fiber surface.
  • Examples of the existence mode of the polyethylene resin of the fiber contained in the non-woven fabric for sanitary use of the present invention include (i) a mode in which both the outer surface and the inside of the fiber are made of polyethylene resin, that is, a mode in which the constituent resin of the fiber is only polyethylene resin.
  • a low melting point component made of polyethylene resin and a high melting point component having a higher melting point than the low melting point component are contained, and at least a part of the fiber surface is continuously present in the length direction. Examples thereof include the mode of the component-based composite fiber.
  • polyethylene resin is known to have high thermal conductivity among organic polymer materials.
  • Specific examples of the above (i) include fibers made of a single type of polyethylene resin as the constituent resin and fibers made of only a plurality of types of polyethylene resins as the constituent resin.
  • Specific examples of the above (ii) include (a) a core sheath fiber in which a resin other than polyethylene resin is used as the core as the high melting point component and a polyethylene resin sheath is formed as the low melting point component so as to cover the surface of the core.
  • the fibers used in the present invention may be solid or hollow. It is preferably a solid fiber from the viewpoint of increasing thermal conductivity and making it easier for the user to perceive a feeling of coldness.
  • the polyethylene resin in the fiber it is preferable to have the polyethylene resin in at least the entire outer surface of the fiber, and it is preferable that the entire fiber is made of the polyethylene resin. That is, it is preferable that the fiber has a core-sheath structure with a polyethylene resin as a sheath, or is a solid fiber made of only polyethylene resin. With such a configuration, the polyethylene resin having high thermal conductivity comes into direct contact with the skin of the user, so that the user can strongly perceive a feeling of coldness.
  • the fibers present in the sanitary non-woven fabric are more preferably fibers made of only polyethylene resin as the constituent resin thereof.
  • the fibers can be easily configured so as to have high thermal conductivity, so that the user can perceive a feeling of coldness more strongly.
  • Examples of the polyethylene resin used in the present invention include low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), high density polyethylene resin (HDPE), linear low density polyethylene resin (LLDPE), and ethylene.
  • LDPE low density polyethylene resin
  • MDPE medium density polyethylene resin
  • HDPE high density polyethylene resin
  • LLDPE linear low density polyethylene resin
  • ethylene -Examples include propylene copolymer and the like. These can be used alone or in admixture or in combination.
  • the proportion of ethylene units in the copolymer is preferably 95% by mass or more, more preferably 98% by mass or more, from the viewpoint of enhancing thermal conductivity.
  • the proportion of the propylene unit in the copolymer is preferably 5% by mass or less, more preferably 2% by mass or less.
  • Examples of the fiber made only of polyethylene resin include fibers made only of HDPE (that is, fibers having 100% by mass of HDPE), core-sheath fibers using a plurality of various polyethylenes described above, and side-by-side fibers.
  • the core-sheath fiber or side-by-side fiber using only polyethylene resin for example, a fiber using HDPE having a different melting point for the core and the sheath, or one or more of LDPE and LLDPE for the core and HDPE for the sheath was used.
  • Examples include core-sheath fibers, core-sheath fibers using HDPE for the core and LLDPE for the sheath, and side-by-side fibers in which HDPE is continuously present along the length direction on at least a part of the surface of the fibers using LLDPE. Be done.
  • the type or combination of polyethylene resin is not limited to the above-mentioned contents and can be applied.
  • HDPE is preferably contained as the polyethylene resin, and may consist only of HDPE, from the viewpoint of having high thermal conductivity and enabling the user to perceive a feeling of coldness more strongly. More preferred. That is, it is more preferable to use HDPE alone.
  • the resin other than the polyethylene resin used in the present invention examples include polyolefin resins other than polyethylene resins such as polypropylene (PP) and polybutene, polyester resins such as polyethylene terephthalate (PET), polyamide resins, polyvinyl chloride and polystyrene.
  • polyolefin resins other than polyethylene resins such as polypropylene (PP) and polybutene
  • PET resins such as polyethylene terephthalate (PET)
  • PET polyamide resins
  • polyvinyl chloride polystyrene
  • vinyl resins acrylic resins such as polyacrylic acid and polymethyl methacrylate
  • fluororesins such as polyperfluoroethylene
  • nylon such as polyperfluoroethylene
  • the content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 100% by mass or less. , Even more preferably 100% by mass.
  • the sanitary nonwoven fabric of the present invention contains fibers having a thermal conductivity of a predetermined value or more in at least a part of the surface.
  • the sanitary non-woven fabric has fibers having a thermal conductivity of preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more as a part of the surface. It is preferable to contain it. Further, it is realistic that the non-woven fabric for hygiene contains fibers having a thermal conductivity of 0.4 W / mK or less in a part of the surface.
  • the above-mentioned thermal conductivity can be measured, for example, by melting a sanitary non-woven fabric and forming it into a film-like sample having a thickness of about 1 mm. The detailed measurement method will be described later.
  • the configuration relating to thermal conductivity in this embodiment can be adopted in place of or in conjunction with the above-described embodiment. Further, with respect to the points not described in the present embodiment, the above-described description of the embodiment and each configuration can be appropriately applied.
  • the above-mentioned sanitary nonwoven fabric having thermal conductivity can be obtained, for example, by including as a constituent fiber a fiber containing one or more of the polyethylene resins used in the above-described embodiment.
  • the thermal conductivity of at least a part of the surface of the constituent fibers is preferably 0.11 W / mK or more, more preferably 0.13 W / mK or more, still more preferably 0.15 W / mK or more. It is preferable to use a fiber having such a thermal conductivity from the viewpoint that the range of the thermal conductivity in the sanitary nonwoven fabric can be easily achieved. Further, the above-mentioned thermal conductivity of the constituent fibers can be easily achieved by using, for example, a fiber made of only polyethylene resin.
  • the thermal conductivity can be measured by, for example, the following method.
  • the non-woven fabric or fiber to be measured is separated from the product by peeling it from the product using a cold spray or the like, or by collecting the fiber.
  • the separated non-woven fabric or fiber is introduced into a heating and pressurizing facility such as a press machine and pressed while heating at a temperature equal to or higher than the melting point of the non-woven fabric or fiber raw material to obtain a film-like sample having a thickness of about 1 mm.
  • the pressurizing conditions are appropriately adjusted so that air does not remain in the sample.
  • heat conduction is based on the amount of heat transferred from the hot plate at 30 ° C to the hot plate at 20 ° C via the sample. Measure the rate. This measurement is performed at 10 points per film-like sample, and the value of the highest thermal conductivity among these is defined as the thermal conductivity (W / mK) in the present invention.
  • the sanitary woven fabric of the present invention has a volume filling rate of preferably 3.5% or more, more preferably 3.5% or more, from the viewpoint of reducing the content of air having a low thermal conductivity and improving the thermal conductivity of the woven fabric. It is 7.0% or more, more preferably 10.0% or more, even more preferably 14.0% or more, still more preferably 20.0% or more. Further, when used as a disposable hygiene material that comes into contact with the user's skin, the above-mentioned volume filling rate is preferably 60.0% or less, more preferably 50.0% or less, from the viewpoint of improving the texture. More preferably, it is 30.0% or less.
  • the content of air having low thermal conductivity is reduced in the sanitary non-woven fabric, so that the heat transfer can be improved, and due to this, the user. Can make you feel colder.
  • the texture of the fiber sheet and the hygienic product incorporating the sheet can be sufficiently expressed.
  • the above-described configuration can be obtained by compressing the fiber sheet or the like, for example, as in the manufacturing method described later.
  • the volume filling rate of the outermost layer in contact with the user's skin may be within the above range.
  • the above-mentioned configuration regarding the volume filling rate includes a sanitary non-woven fabric containing fibers whose surface is at least partly made of polyethylene resin, a sanitary non-woven fabric having a heat conductivity on the surface of the constituent fibers of a predetermined value or more, and heat as the non-woven fabric. It can be applied to each embodiment of the sanitary nonwoven fabric having a conductivity of a predetermined value or more.
  • the volume filling factor in the present invention can be expressed as a percentage of the apparent volume with respect to the actual volume.
  • a predetermined area of the sanitary non-woven fabric to be measured is cut out to obtain a measurement sample, and the mass (g) thereof is measured.
  • the predetermined area for cutting the measurement sample is preferably 10 cm square, but if the measurement sample cannot be cut out with that size, it can be done in a region where the basis weight of the sanitary non-woven fabric to be measured is visually uniform. Cut out with a width and length that will be the largest area. Then, the basis weight A (g / cm 2 ) of the measurement sample is calculated.
  • the method for measuring the thickness B (cm) of the measurement sample is as follows.
  • a plate of 12.59 g (diameter 55 mm) was placed on a laser displacement meter (LK-080 manufactured by KEYENCE CORPORATION. All laser displacement meters in the present specification are this), and the measured thickness was measured. Is set to zero and the zero point is adjusted. Then, the plate is placed on the measurement sample, and the thickness in that state is measured using a laser displacement meter, and this is defined as the thickness B (cm) of the measurement sample. In the measurement of the thickness B, a load of 4.9 mN / cm 2 is applied to the measurement sample by placing the plate. Further, the volume filling rate (%) is calculated from the following formula using the density C (g / cm 3) of the constituent components of the fiber.
  • volume filling rate (%) 100 ⁇ (A) / (B ⁇ C) If the hygiene non-woven fabric to be measured is incorporated into a hygienic product such as an absorbent article, spray a cold spray on the hygiene product to solidify the hot melt adhesive, and then carefully apply the hygiene non-woven fabric to be measured. Peel off. This means is common to other measurements herein.
  • the sanitary non-woven fabric having the above structure uses fibers having polyethylene resin having high thermal conductivity as at least a part of the surface among synthetic resins, when the fibers come into contact with the user's skin, the user The heat caused by the body temperature can be quickly transferred from the user to the sanitary non-woven fabric or to other fibers that are not in contact with the user.
  • the volume filling rate of the sanitary non-woven fabric is within a predetermined value range, so that the hygienic non-woven fabric contains air having low thermal conductivity while exhibiting a good texture as a fiber sheet. Since the amount can be reduced, the heat generated by the user can be quickly transferred to the sanitary non-woven fabric side.
  • the user when the user's skin comes into contact with the sanitary non-woven fabric, the user can perceive a feeling of coldness and can give a comfortable feeling of use due to the feeling of coldness.
  • the user can be made to perceive a feeling of coldness more strongly, which contributes to further improvement of the feeling of use.
  • the sanitary non-woven fabric is configured to include the form of fibers, the contact area when the user's skin and the sanitary non-woven fabric come into contact with each other can be increased, and the user can perceive a feeling of coldness. At the same time, the flexibility due to the composition of the non-woven fabric can be exhibited.
  • the fibers constituting the sanitary non-woven fabric are preferably in contact with each other, and more preferably the fibers are in contact with each other at a plurality of points.
  • the heat generated by the contact with the user's skin can be transferred in multiple directions, so that the heat caused by the user's body temperature can be transferred with high efficiency, and as a result, to the user. It is possible to perceive a feeling of coldness more efficiently.
  • the term "contacting" in the present invention means that the fibers are in contact with each other with a clear boundary between the fibers, and that the fibers are fused to each other, and the boundary between the fibers is not present. Includes both aspects that are clear.
  • contacting at a plurality of points means that when a non-woven fabric is cut in a direction orthogonal to the extending direction of its constituent fibers and an arbitrary fiber F on the cut surface is observed, the non-woven fabric is in the thickness direction of the non-woven fabric. It means that the upper and lower fibers located and in contact with the fiber F are in contact with the fiber F at two or more points.
  • a fiber having a non-circular cross-sectional shape such as an elliptical shape or a multi-leaf shape, which will be described later, is used, and the non-woven fabric as a raw material is used in the manufacturing process described later. It can be obtained by performing a consolidation process such as compression.
  • the contact mode is preferably configured by fusion or pressure bonding.
  • Fusing is a mode in which the boundary between fibers becomes unclear because the fibers are melted by applying only heat or heat and pressure to a plurality of fibers.
  • Crimping is a mode in which only pressure is applied to a plurality of fibers so that the fibers are in contact with each other with a clear boundary between the fibers, and it is permissible that a gap formed between the fibers exists. .. In the crimping, it is also preferable that the above-mentioned "contact at a plurality of points" mode is adopted.
  • cross-sectional shape of the fibers constituting the sanitary non-woven fabric examples include circular shapes such as perfect circles and ellipses, and geometric shapes such as convex polygons such as triangles, quadrangles, pentagons and hexagons, and regular polygons. .. Further, in addition to these geometric shapes, a multi-leaf shape may be formed in which a structure having a plurality of concave portions and convex portions is formed along the outer periphery of the cross section.
  • the "cross-sectional shape" in the present invention refers to a shape when the fibers constituting the sanitary non-woven fabric are observed in a cross section orthogonal to the extending direction thereof.
  • the cross-sectional shape of the fiber is preferably a non-perfect circular shape, and is a shape having a major axis and a minor axis, such as an elliptical shape or a combination of an elliptical shape and a multi-leaf shape. Is more preferable. With such a shape, it is possible to easily increase the volume filling rate of the sanitary non-woven fabric, and increase the number of contact points and contact areas between fibers to further improve the heat transfer efficiency. Therefore, the feeling of coldness can be perceived more effectively by the user.
  • the ratio of the length of the major axis to the length of the minor axis is preferably It is 1.5 or more, more preferably 2 or more, and even more preferably 3 or more. Further, the above-mentioned ratio is preferably 10 or less, more preferably 8 or less, still more preferably 5 or less, from the viewpoint of improving the spinnability at the time of producing the fiber and increasing the production efficiency. Moreover, it is preferable that the above-mentioned ratio is satisfied in the total length of the fiber.
  • the length of each of the major axis and the minor axis in the cross-sectional shape of the fiber can be measured by, for example, the following method.
  • First, the non-woven fabric to be measured is cooled with liquid nitrogen and then cut with a cutter in the direction orthogonal to the fiber length direction to prepare a measurement sample.
  • the cross section of the measurement sample is observed using a scanning electron microscope (SEM) at an arbitrary magnification such that the fiber cross section can be recognized and the size of the fiber cross section can be measured.
  • SEM scanning electron microscope
  • the thickness of the non-woven fabric for hygiene is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.3 mm or more. Further, from the viewpoint of reducing the air content in the non-woven fabric and increasing the thermal conductivity, it is preferably 3 mm or less, more preferably 1.5 mm or less, still more preferably 0.5 mm or less.
  • the thickness of the above-mentioned sanitary nonwoven fabric shall be measured using a laser displacement meter or the like under a load of 4.9 mN / cm 2 (0.5 gf / cm 2). Since the thickness of the sanitary nonwoven fabric is configured as described above, it is possible to efficiently manufacture the sanitary nonwoven fabric that can increase the heat capacity of the sanitary nonwoven fabric and allow the user to efficiently perceive a feeling of coldness.
  • the sanitary nonwoven fabric of the present invention has a basis weight of preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, and further preferably 25 g / m 2 or more.
  • the non-woven fabric for hygiene of the present invention has a basis weight of preferably 140 g / m 2 or less, more preferably 90 g / m 2 or less, and further preferably 50 g / m 2 or less.
  • the contact sensation q max is preferably 0.06 W / m 2 or more, more preferably 0.08 W / m 2 or more, further preferably 0.10 W / m 2 or more, preferably 0.80 W / m 2 or less, more preferably 0.60 W / m 2, more preferably not more than 0.50 W / m 2.
  • contact sensation q max of hygiene nonwovens preferably 0.06 W / m 2 or more 0.80 W / m 2 or less, more preferably 0.08 W / m 2 or more 0.60 W / m 2 or less , further preferably 0.10 W / m 2 or more 0.50 W / m 2 or less.
  • the cool contact feeling q max can be measured by, for example, the following method. First, a test piece is cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece is left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Next, in this environment, the test piece is placed on the measuring table, and the test piece is fixed to the measuring table using double-sided tape. As the measuring table, a constant temperature device using a gas or liquid as a heat medium is used.
  • the cool contact feeling q max of the measurement target is measured according to the measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.) and the measurement manual of the device.
  • a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target).
  • the contact pressure of the copper plate to the measurement target is set to 1 kPa, the copper plate is brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact is set to zero, and the maximum value of the heat flow rate is measured.
  • This measurement is performed 5 times for the surface to be measured, and the arithmetic mean value of the plurality of measured values is defined as the cool contact feeling q max (W / m 2 ) of the measurement target.
  • the cool contact sensation is a numerical value of the sensation of the skin that feels cold when the skin touches an object. This cool contact feeling depends on the amount of heat transferred from the skin to the object when the skin touches the object, and the larger the amount of heat transferred, the colder the feeling when touched.
  • the cool contact feeling q max corresponds to the maximum value of the amount of heat transferred from the skin to the object, and the value of the cool contact feeling q max is larger and feels warmer when the object is touched. The smaller the case. Therefore, when the value of the contact cooling sensation q max is in the above range, the cooling sensation can be perceived more effectively.
  • the sanitary nonwoven fabric of the present invention is a sheet-like material having two surfaces, and the abundance ratio of constituent fibers on the surface of the sanitary nonwoven fabric (hereinafter, this is also referred to as "fiber surface abundance ratio”) is equal to or higher than a predetermined value. Is preferable.
  • the surface of the sanitary non-woven fabric is a region from the outermost surface of the sanitary non-woven fabric to 20 ⁇ m in the thickness direction.
  • the outermost surface of the sanitary non-woven fabric is the thickness direction in the image when the sanitary non-woven fabric is cut along the thickness direction and the cross section along the thickness direction is observed using a scanning electron microscope (SEM).
  • the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more, more preferably 45% or more, still more preferably 50% or more, preferably 90% or less, more preferably 85% or less, and further. It is preferably 80% or less. More specifically, the fiber surface abundance of the sanitary non-woven fabric is preferably 40% or more and 90% or less, more preferably 45% or more and 85% or less, and further preferably 50% or more and 80% or less.
  • the fiber surface abundance ratio is a representation of the relationship between the constituent fibers and the voids between the fibers on the surface of the non-woven fabric, focusing on the abundance ratio of the fibers. Therefore, when the fiber surface abundance rate is in the above range, the air content in the fiber can be reduced, and a higher cooling sensation can be obtained.
  • the fiber surface abundance can be measured as an area-based ratio, for example, based on the following method. Specifically, two sections having a size of 4 cm ⁇ 4 cm are randomly cut from the sanitary non-woven fabric to be measured. One surface of the obtained sample is measured using a scanning electron microscope (SEM) at a voltage of 15 kV and a magnification of 50 times to obtain an SEM image. Next, using the image processing software WinROOF2018 (manufactured by Mitani Shoji Co., Ltd.), the SEM image was binarized at a threshold value of 121 to 255, and the light color (white) of the binarized area with respect to the entire area of the image.
  • SEM scanning electron microscope
  • WinROOF2018 manufactured by Mitani Shoji Co., Ltd.
  • the area ratio at the site is measured and calculated using the area calculation function built into the software, and this area ratio is used as the fiber surface abundance rate of the present invention.
  • the threshold value is binarized to a value of 70 to 255, and the area ratio of the light-colored portion is measured.
  • the fibers constituting the nonwoven fabric are arranged with a certain orientation. With such a configuration, heat transfer is likely to occur along the fiber length direction, and it is possible to make the user perceive a feeling of coldness.
  • the fiber length direction of the fibers of the non-woven fabric is substantially parallel to the horizontal plane when the non-woven fabric is allowed to stand on the horizontal plane.
  • the extending direction of the fibers is one direction.
  • the extending direction of the fibers is the first direction or the second direction of the non-woven fabric. It is more preferable that it matches with.
  • the fibers have intersections, it is desirable that 50% or more of the fibers having the intersections have an obtuse angle in the plan view of the sanitary non-woven fabric.
  • An obtuse angle refers to an angle larger than 90 °.
  • a long sheet is manufactured using HDPE short fibers as a material, the long sheet is conveyed while applying tension in the conveying direction, and the fibers are fused by an air-through method.
  • it can be obtained by manufacturing by a method of transporting the HDPE fiber in one direction while spinning the HDPE fiber to a transport facility such as a belt conveyor.
  • the sanitary nonwoven fabric has an embodiment in which it has a single fiber layer containing fibers in which at least a part of the surface is made of polyethylene resin (consisting of only a single fiber or with other fibers). (It does not matter whether it is a mixed cotton or not) has been explained as an example, but the present invention is not limited to this form.
  • the sanitary nonwoven fabric may have a plurality of fiber layers of two or more layers.
  • a fiber layer containing a first fiber whose surface is at least partially made of polyethylene resin hereinafter, also referred to as a first fiber layer
  • a second fiber containing fibers other than the first fiber hereinafter, this is also referred to as a second fiber layer.
  • adjacent means that the fiber layers are adjacent to each other without interposing other fiber layers, and it is permissible that an adhesive is interposed between the fiber layers.
  • the first fiber layer constitutes the outer surface of the sanitary non-woven fabric.
  • At least the first fiber layer satisfies various preferable forms of the above-mentioned sanitary nonwoven fabric, and it is more preferable that the entire sanitary nonwoven fabric satisfies the above-mentioned preferable forms.
  • the multi-layered sanitary nonwoven fabric is obtained by laminating, for example, a fiber web containing a first fiber whose surface is at least partially made of polyethylene resin and a second fiber web containing fibers other than the first fiber. It can be obtained by performing air-through processing or spunbond processing in the state.
  • the boundary of each fiber layer is generally unclear, but it may include a portion where the boundary is clear.
  • each fiber layer maintains the shape of the fiber sheet by, for example, at least one of entanglement, fusion and pressure bonding.
  • Another embodiment of the multi-layered sanitary non-woven fabric is a fiber web or fiber sheet containing first fibers in which at least a part of the surface is made of polyethylene resin, and a fiber web or fiber sheet containing fibers other than the first fibers.
  • An embodiment in which the form of the fiber sheet is maintained by adhering and joining with an adhesive can be mentioned. In this case, the boundaries of each fiber layer are generally clear.
  • the fibers other than the first fiber include fibers containing the above-mentioned constituent resins such as PET resin and PP resin, pulp fibers, rayon fibers, and other hydrophilized fibers.
  • the basis weight of the second fiber layer is preferably 15 g / m 2 or more, more preferably 20 g / m 2 or more, further preferably 25 g / m 2 or more, and preferably 140 g / m 2 or less, more preferably 90 g / m. It is 2 or less, more preferably 70 g / m 2 or less.
  • the above-mentioned sanitary non-woven fabric may be used as it is, or the sanitary non-woven fabric may be used as a constituent member of the sanitary product and may be a sanitary product provided with the sanitary non-woven fabric. Further, when the sanitary nonwoven fabric of the present invention is incorporated into a sanitary product, it is preferable that the nonwoven fabric constitutes a surface facing the skin of the user. In either case, they are typically disposable.
  • the hygienic product provided with the non-woven fabric for hygiene of the present invention is, for example, an absorbent article. That is, the sanitary non-woven fabric can be used as a constituent member of an absorbent article or the like.
  • the absorbent article comprises a front surface sheet, a back surface sheet, and an absorber disposed between the front surface sheet and the back surface sheet, and in addition to this, or a front surface sheet or a back surface sheet. Instead of, it can be used in a state where a sanitary non-woven fabric is arranged.
  • Absorbent articles include, for example, disposable diapers, incontinence pads, sanitary napkins, panty liners, etc., but are not limited thereto, and articles used for absorbing liquid discharged from the human body are widely used. Include.
  • the sanitary non-woven fabric is used when using a sanitary product such as an absorbent article, or when handling a sanitary product such as an absorbent article from the packaging. It can be placed on the part that comes into direct contact with the person's skin. That is, the sanitary non-woven fabric is preferably arranged on the outer surface of a sanitary product such as an absorbent article.
  • the outer surface of hygiene products such as absorbent articles is the surface of hygienic products such as absorbent articles that the user can touch after opening the package and taking out the hygienic products such as absorbent articles. It is contained, but it means the surface side, not the inner surface, which is advanced in the thickness direction.
  • the hygienic non-woven fabric constituting the hygiene product may be arranged on the surface facing the skin of the wearer wearing the hygiene product, or may be arranged on the surface not facing the skin of the wearer wearing the hygiene product.
  • a sanitary product package may be constructed.
  • an absorbent article which is an embodiment of a sanitary product for example, when a sanitary non-woven fabric is used for a disposable diaper, for example, a surface sheet, a side non-woven fabric, gathers around the waist and gathers arranged in the vicinity of the inguinal region, and an exterior. It can be used as a constituent member of a body or the like.
  • a sanitary non-woven fabric is used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a hygienic product, for example, a surface sheet, a side non-woven fabric, a hip guard, a bag for individual wrapping, or the like is configured. It can be used as a member.
  • a sanitary non-woven fabric when used for a urine leak pad and a sanitary napkin as an absorbent article which is an embodiment of a sanitary product, it may be used as a constituent member such as a surface sheet or gathers arranged in the vicinity of the inguinal region. can.
  • the sanitary non-woven fabric when using sanitary products such as absorbent articles, is worn at an appropriate position from the viewpoint of perceiving a feeling of coldness and reducing discomfort due to stuffiness and the like.
  • the fabric is arranged so as to form a surface facing the skin of the wearer who wears the hygienic product of the absorbent article (hereinafter, this is also referred to as a “skin facing surface”).
  • the hygienic non-woven fabric is arranged at a portion where the hygienic product of the absorbent article and the skin of the wearer come into direct contact with each other when worn.
  • the constituent members of such an absorbent article include a surface sheet, a side non-woven fabric, waist gathers, gathers arranged in the vicinity of the inguinal region, and the like.
  • the front surface sheet used for the absorbent article is a sheet constituting the skin facing surface side
  • the back surface sheet is a surface facing the side opposite to the skin of the wearer who wears the absorbent article (hereinafter, this is referred to as "non-skin"). It is a sheet that constitutes the side facing the skin.
  • non-skin a non-woven fabric for sanitary use of the present invention
  • those conventionally used for the absorbent article can be used without particular limitation.
  • the surface sheet for example, various liquid-permeable non-woven fabrics, perforated films, and the like can be used.
  • the back surface sheet a liquid impervious or water repellent or liquid permeable sheet can be used. Examples of the former include a resin film and a laminate of a resin film and a non-woven fabric or the like. The latter can be the same as the surface sheet.
  • the absorber used in the absorbent article comprises an absorbent core.
  • the absorbent core is composed of, for example, a laminated fiber of hydrophilic fibers such as cellulose such as pulp, a mixed fiber of the hydrophilic fiber and a water-absorbent polymer, a deposit of a water-absorbent polymer, and the like, and is typically composed of. Includes hydrophilic fibers and water-absorbing polymers.
  • the absorbent core may be covered with a core wrap sheet.
  • a coating mode of the core wrap sheet for example, at least the skin facing surface thereof may be covered with a liquid-permeable core wrap sheet, and the entire surface including the skin facing surface and the non-skin facing surface is covered with the core wrap sheet. It may be covered.
  • the core wrap sheet for example, thin paper made of hydrophilic fibers, a non-woven fabric having liquid permeability, or the like can be used.
  • the fiber diameter of the fibers used in the sanitary non-woven fabric is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, from the viewpoint that the constituent fibers do not cling to the skin and the user's tactile sensation is kept good. Further, from the viewpoint of reducing the fiber gaps in the non-woven fabric, reducing the air content in the non-woven fabric, and increasing the thermal conductivity, it is preferably 70 ⁇ m or less, more preferably 50 ⁇ m or less.
  • the fiber diameter of the fiber is measured by preparing a measurement sample and observing SEM in the same manner as the measurement method for each length of the major axis and the minor axis in the cross-sectional shape of the fiber, and measuring the fiber diameter of 10 fibers per sample.
  • the arithmetic average value is used as the fiber diameter of the present invention.
  • the length of each of the major axis and the minor axis of the fiber is measured by the above method, and the arithmetic average value of the major axis length and the minor axis length of one fiber is calculated as the fiber diameter.
  • the arithmetic average value of 10 fibers of the fiber diameter is defined as the fiber diameter of the fiber in the present invention.
  • the sanitary nonwoven fabric of the present invention may further contain a filler for increasing the thermal conductivity.
  • a filler include at least one such as titanium oxide, alumina, boron nitride, magnesium oxide, silica, carbon black, and carbon nanotubes.
  • the filler may be present in the fiber, may be present between the fibers, may be partially exposed on the fiber surface, and may be embedded in the fiber inside the fiber.
  • the sanitary product is a sanitary non-woven fabric in which at least a part of the surface is an aggregate of fibers made of polyethylene resin (hereinafter, this is referred to as "first” for convenience of explanation.
  • first an aggregate of fibers made of polyethylene resin
  • second member another member (hereinafter, this member may also be referred to as a “second member”) may be provided.
  • a hygienic product to which the second member is arranged for example, as the second member, at least one of an absorbent sheet containing an absorbent polymer and a fiber, an absorbent body containing an absorbent polymer and a fiber, and the like are used. Can be used. These are examples of fiber aggregates different from sanitary non-woven fabrics.
  • the above-mentioned absorbent article is preferably mentioned. That is, in the present embodiment, the sanitary non-woven fabric, which is the first fiber aggregate, and the absorbent sheet and / or the absorbent body, which are the second members, are arranged as the constituent materials of the sanitary product.
  • first fiber assembly and the second member are arranged adjacent to each other.
  • the fiber aggregates in this embodiment may or may not be joined to each other.
  • the absorbent sheet for example, the absorbent sheet described in JP-A-8-246395 can be used.
  • the second member or the second fiber layer whose thickness change is equal to or more than a predetermined value shall be used.
  • the amount of compressive deformation of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.5 mm or more. Further, the amount of compressive deformation of the second member under the same load is preferably 3 mm or less.
  • the amount of change in compression is expressed as the amount of change obtained by subtracting the thickness of the second member under a load of 9.8 mN / cm 2 (1 gf / cm 2) from the thickness of the second member under no load. Will be done. It is preferable that the second fiber layer constituting the sanitary non-woven fabric has the same amount of compressive deformation. In addition to this, when the sanitary product includes both the sanitary non-woven fabric having a multi-layer structure and the second member, it is preferable that both the second member and the second fiber layer satisfy the above-mentioned compression deformation amount, respectively.
  • the first fiber aggregate containing fibers whose surface is at least partly made of polyethylene resin touches the wearer the first fiber aggregate undergoes deformation of the second member. It can be easily deformed to follow and increase the contact area with the wearer so that the wearer can efficiently perceive the feeling of coldness.
  • the second fiber layer having the above-mentioned physical properties is, for example, a fiber subjected to air-through treatment using a fiber made of PET resin or PP resin as a constituent fiber, a PET / HDPE core-sheath composite fiber, or the like in the manufacturing method described later. It can be obtained by using the web.
  • the second member is an absorbent sheet or an absorbent body, it can be obtained, for example, by appropriately adjusting the basis weight of the fibers, the fiber sheet and the water-absorbing polymer constituting the absorbent sheet or the absorbent body.
  • the thickness of the second member or the second fiber layer can be measured by, for example, the following method.
  • the object to be measured is a sanitary product, after fixing the structure by immersing the sanitary product in liquid nitrogen, carefully select the sanitary non-woven fabric and the second member other than the sanitary non-woven fabric from the sanitary product to be measured. Peel off and separate.
  • the separated members are subjected to the measurement of the cool contact feeling q max described in detail in Examples described later, the fiber sheet having the highest q max value is used as a sanitary non-woven fabric, and the member adjacent to the sanitary non-woven fabric is used. It is used as the second member. Then, with a load of 9.8 mN / cm 2 (1 gf / cm 2 ) applied to the separated second member by placing a plate or the like, the thickness in that state is measured using a laser displacement meter. Then, this is taken as the thickness of the second member.
  • the fiber layer on the surface side having the highest q max value measured by the above method is the first fiber layer, and the fiber layer adjacent to the first fiber layer. Is used as the second fiber layer, and the second fiber layer is subjected to the above-mentioned measurement.
  • the amount of compressive deformation under a load of 9.8 mN / cm 2 (1 gf / cm 2 ) is preferably 0.3 mm or more, more preferably 0.4 mm or more in the entire hygienic product.
  • the amount of compressive deformation of the entire sanitary product under the same load is preferably 15 mm or less, more preferably 10 mm or less.
  • the above-mentioned amount of compression deformation is such that the temperature and wind speed of hot air are lower than those normally adopted, the number of fibers is increased, and a resin having a melting point higher than the temperature of hot air is used.
  • a resin having a melting point higher than the temperature of hot air is used.
  • two or more fiber layers are provided, and only one fiber layer is provided with a layer having a higher amount of compression deformation than the other fiber layers, or the basis weight of one fiber layer is determined. This can be easily achieved by adopting a structure in which the number of fibers is increased as compared with other fiber layers, or fibers having a high melting point are mixed with one fiber layer.
  • the amount of compression deformation can be measured using, for example, a KES-FB-3 compression tester manufactured by Kato Tech Co., Ltd. A section of a certain size is used as a sample from the sanitary non-woven fabric to be measured. The sample is mounted on the test bench of the testing machine and compressed between steel plates having a circular plane with an area of 2 cm 2. The compression rate is 0.02 mm / sec, and the maximum compression load is 9.8 mN / cm 2 (1 gf / cm 2 ). When the thickness under no load is T0 (mm) and the thickness is 9.8 mN / cm 2 (1 gf / cm 2 ), the thickness under load is Tm (mm). It can be calculated as "T0-Tm" obtained by subtracting the thickness Tm from.
  • the total basis weight is preferably 40 g / m 2 or more, more preferably 60 g / m 2 or more, further preferably 70 g / m 2 or more, and preferably 500 g / m 2 or less. , More preferably 400 g / m 2 or less, still more preferably 300 g / m 2 or less.
  • the total basis weight is preferably 30 g / m 2 or more, more preferably 40 g / m 2 or more, further preferably 50 g / m 2 or more, and preferably 600 g / m 2 or less. , More preferably 550 g / m 2 or less, still more preferably 500 g / m 2 or less.
  • This manufacturing method includes a step (air-through step) of obtaining a fiber aggregate by performing an air-through treatment on a web of fibers whose surface is at least partly made of polyethylene resin.
  • a step of performing a consolidation treatment on the obtained fiber aggregate (consolidation step).
  • the fiber used in the present production method has a thermal conductivity in the range of the above-mentioned values.
  • the surface forms a web of fibers made of polyethylene resin.
  • the fiber web can be formed, for example, by a card method using a known card machine.
  • an air-through treatment is performed in which hot air is blown onto the fiber web to obtain an aggregate of fibers whose surface is at least partly made of polyethylene resin.
  • This step is a step of making a web of fibers into a non-woven fabric, and the fiber aggregate thus produced is generally called an air-through non-woven fabric.
  • a core-sheath fiber having a polyethylene resin as a sheath and a refractory resin other than the polyethylene resin as a core is mainly used from the viewpoint of manufacturing efficiency. It is very difficult to make a fiber composed of chisel into a polyethylene by air-through processing.
  • the use of core-sheath fibers is advantageous in that it enhances the texture and strength of the obtained air-through non-woven fabric, but there is room for improvement in that the user perceives a feeling of coldness due to the improvement in thermal conductivity. there were.
  • the temperature and the wind speed of the hot air blown to the fiber web are within a specific range.
  • the temperature of the hot air blown onto the fiber web is preferable from the viewpoint of improving the texture of the obtained sanitary non-woven fabric in relation to the melting point M (° C.) of the resin constituting the fiber surface constituting the fiber web.
  • the temperature of the hot air blown to the fiber web is preferably the melting point M-4 ° C. or higher. It can be more preferably in the range of melting point M-2 ° C. or higher, more preferably in the range of melting point M or higher.
  • the temperature of the hot air described above is the temperature at the outlet of the hot air. This temperature can be measured, for example, by attaching a thermocouple to the outlet or as close as possible to it.
  • the temperature of the hot air is preferably 126 ° C. or higher, more preferably 128 ° C. or higher, still more preferably 128 ° C. or higher.
  • the temperature can be 130 ° C. or higher.
  • the temperature of the hot air under the above conditions can be preferably 134 ° C. or lower, more preferably 133 ° C. or lower, and even more preferably 132 ° C. or lower.
  • the melting point M of the resin constituting the fiber surface can be measured using a differential scanning calorimetry meter (DSC7000x, manufactured by Hitachi High-Tech Science Co., Ltd.). First, using a finely cut fiber sample (1 mg), thermal analysis of the sample is performed at a heating rate of 10 ° C./min, and the melting peak temperature of each resin is measured. The melting point is defined by the melting peak temperature at the first temperature rise. If the melting point cannot be clearly measured by this method, this resin is defined as "resin having no melting point". In the case of a resin having no melting point, the softening point is defined as the melting point M.
  • DSC7000x differential scanning calorimetry meter
  • the wind speed of the hot air blown to the fiber web is preferably 0.6 m / sec or more from the viewpoint of allowing the hot air to sufficiently pass in the thickness direction of the fiber web and facilitating the formation of fusion between the fibers. More preferably, it is 1 m / sec or more. From the same viewpoint, the wind speed of the hot air blown to the fiber web is preferably 2 m / sec or less, more preferably 1.4 m / sec or less.
  • the transport speed of the fiber web in the air-through step is preferably 3 m / min or more, more preferably 10 m / min or more, preferably 200 m / min or less, still more preferably 160 m / min or less in the above temperature and wind speed ranges. Is.
  • the fiber aggregate obtained through the above steps is made into a non-woven fabric, it may be used as it is as the non-woven fabric for hygiene of the present invention.
  • This sanitary non-woven fabric is an air-through non-woven fabric.
  • consolidation step a method capable of pressurizing and compressing the fiber aggregate in the thickness direction thereof can be adopted.
  • the consolidation treatment for example, a method of arranging a fiber aggregate between two metal flat plates and applying pressure (hereinafter, this method is also referred to as a "press method") or introducing a fiber aggregate between a pair of rolls. It can be carried out by a method of pressurizing (hereinafter, this method is also referred to as a "calendar method").
  • the consolidation treatment may be performed only once, or may be performed a plurality of times by the same or different methods as required. Further, the temperature in the consolidation treatment may be room temperature, a heated state, or a combination thereof.
  • the pressurizing conditions in the consolidation treatment are expressed in terms of surface pressure when the press method is used, from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 5 MPa or more, more preferably 10 MPa or more. Further, from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film, it is added in the consolidation treatment.
  • the pressure condition can be expressed in terms of surface pressure, preferably 72 MPa or less, and more preferably 32 MPa or less.
  • the pressurizing condition when the calendar method is adopted is expressed in linear pressure from the viewpoint of sufficiently compacting the fiber aggregate to facilitate obtaining a sanitary non-woven fabric having a high volume filling rate, preferably 78. It is 4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more.
  • the calendar method was adopted from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film.
  • the pressurizing condition at this time is preferably 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less in terms of linear pressure.
  • the heating temperature in the consolidation treatment can be set by either the press method or the calendar method from the viewpoint of sufficiently consolidating the fiber aggregates and facilitating the acquisition of a sanitary non-woven fabric having a high volume filling rate. It is preferably 70 ° C. or higher, more preferably 80 ° C. or higher. Either the press method or the calendar method is used from the viewpoint of improving the texture of the obtained sanitary non-woven fabric while maintaining the fiber shape in which the boundaries between the constituent fibers are clear without forming the fiber aggregate into a film. Even in the case of, the temperature can be preferably 120 ° C. or lower, more preferably 110 ° C. or lower.
  • the metal flat plate may be heated to the above temperature range in the press method, and the peripheral surface of the roll may be heated to the above temperature range in the calendar method.
  • the pressurization time in the consolidation treatment can be appropriately set as long as the fiber shape of the fibers constituting the fiber aggregate is maintained and the consolidation is possible.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 5 seconds or longer, more preferably 10 seconds or longer per consolidation treatment.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 25 seconds or less, more preferably 20 seconds or less per consolidation treatment.
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.01 seconds or more, more preferably 0.04 seconds or more per consolidation treatment. ..
  • the pressurization time under the above-mentioned pressure and temperature conditions can be preferably 0.1 seconds or less, more preferably 0.08 seconds or less per consolidation treatment. ..
  • the fiber aggregate By performing the consolidation treatment under the above conditions, the fiber aggregate can be compressed in the thickness direction to easily obtain a sanitary non-woven fabric having a predetermined volume filling rate.
  • the morphological stability and dimensional stability due to heat treatment can be improved while the fiber constituent resin is unlikely to melt, so that a predetermined volume filling rate can be maintained even after production.
  • a maintained non-woven fabric for hygiene can be obtained.
  • the cross-sectional shape of the fiber can be flattened by the consolidation treatment, so that there is an advantage that the volume filling rate can be increased.
  • the sanitary non-woven fabric obtained by the above method is an air-through non-woven fabric even after undergoing a consolidation treatment.
  • the non-woven fabric for hygiene of the present invention can be produced by a method based on the spunbond method instead of the above-mentioned production method.
  • the sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric. Specifically, the raw material resin of the fiber is extruded from a spinneret having a large number of pores in a molten state, and the extruded resin is stretched with a roll or the like to form long fibers, and these long fibers are accumulated on a net conveyor. To obtain a web of fibers in which at least a part of the surface is made of polyethylene resin.
  • a fiber web is introduced between the emboss rolls and compacted (thermocompression bonding) by heating and pressurizing to obtain the sanitary nonwoven fabric of the present invention. That is, in this method, the non-woven fabric of the fiber web and the consolidation treatment are performed at the same time.
  • the temperature and pressurizing conditions in the embossed roll can be in the same range as the conditions of the consolidation treatment described above.
  • a second fiber web containing a thermoplastic resin formed by the card method is used, and a fiber web having at least a part of its surface made of polyethylene resin is used.
  • a laminated body of fiber web is formed.
  • an air-through non-woven fabric which is a fiber aggregate having a multi-layer structure can be obtained.
  • the temperature of the hot air to be blown is determined by setting the melting point of the resin having the lowest melting point as the above-mentioned melting point M.
  • a fiber web in which at least a part of the surface is made of polyethylene resin and a second fiber web containing a thermoplastic resin are each air-through treated to form a fiber sheet. After obtaining, these fiber sheets can be obtained by joining them with an adhesive.
  • the fiber aggregate obtained through the above steps may be used as it is as the sanitary nonwoven fabric of the present invention.
  • the consolidation step may be performed under the above-mentioned conditions.
  • the non-woven fabric of interest can also be produced by a method based on the spunbond method.
  • the above-mentioned second fiber web may be laminated on a fiber web in which at least a part of the surface is made of polyethylene resin, and in that state, consolidation (thermocompression bonding) by heating and pressurization may be performed. ..
  • the sanitary nonwoven fabric produced in this way is a spunbonded nonwoven fabric.
  • the sanitary nonwoven fabric of the present invention can be obtained.
  • This sanitary non-woven fabric is preferably incorporated as a constituent member of a sanitary product such as an absorbent article in a subsequent step.
  • the sanitary non-woven fabric manufactured by the above method is used as one of the constituent materials in any of the steps for manufacturing the sanitary product.
  • One or more of the steps of cutting the sanitary non-woven fabric and performing various operations such as laminating or joining the sanitary non-woven fabric and other constituent materials (for example, an absorber or a sheet) constituting the sanitary product. In preparation for this, it is possible to manufacture a sanitary product such as a target absorbent article.
  • a sanitary nonwoven fabric as a first fiber aggregate is used at any stage of the manufacturing process of the sanitary product.
  • the above-mentioned absorbent body and absorbent sheet may be laminated or joined in a state of being adjacent to each other.
  • the sanitary non-woven fabric may be arranged so as to form a surface facing the wearer's skin when wearing the sanitary product, or may be arranged on the surface side not facing the wearer's skin when wearing the sanitary product. May be good.
  • the following sanitary nonwoven fabric, an absorbent article provided with the same, and a method for producing the sanitary nonwoven fabric are disclosed.
  • At least part of the surface contains fibers made of polyethylene resin, A sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 10% or more, still more preferably 14% or more.
  • At least a part of the surface contains fibers having a thermal conductivity of 0.11 W / mK or more, more preferably 0.13 W / mK or more, and even more preferably 0.15 W / mK or more.
  • a sanitary non-woven fabric having a volume filling rate of 3.5% or more, more preferably 7% or more, still more preferably 14% or more.
  • the fiber contains (i) a low melting point component made of polyethylene resin on both the outer surface and the inside of the fiber, or (ii) a low melting point component made of polyethylene resin, and a high melting point component having a melting point higher than that of the low melting point component.
  • the content of the polyethylene resin with respect to the total mass of the resin contained in the sanitary non-woven fabric is 70% by mass or more and 100% by mass or less, preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 100% by mass or less.
  • ⁇ 6> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 5>, wherein the resin constituting the fiber is only polyethylene resin.
  • the cross-sectional shape of the fiber has a major axis and a minor axis, and has a major axis and a minor axis. Any one of ⁇ 1> to ⁇ 6>, wherein the ratio of the length of the major axis to the length of the minor axis (length of the major axis / length of the minor axis) is 1.5 or more and 10 or less.
  • ⁇ 8> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>, wherein the fibers are in contact with each other at a plurality of points in a cross-sectional view.
  • ⁇ 9> 4.9 mN / cm 2
  • ⁇ 10> 4.9 mN / cm 2
  • ⁇ 11> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 10>, wherein the basis weight is 15 g / m 2 or more and 140 g / m 2 or less.
  • ⁇ 12> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 11>, wherein the basis weight is 25 g / m 2 or more and 50 g / m 2 or less.
  • ⁇ 13> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 12>, wherein the polyethylene resin contains a high-density polyethylene resin, and preferably consists only of the high-density polyethylene resin.
  • ⁇ 14> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 13>, wherein the fiber diameter of the fiber is 3 ⁇ m or more, preferably 5 ⁇ m or more.
  • ⁇ 15> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 14>, wherein the fiber diameter of the fiber is 70 ⁇ m or less, preferably 50 ⁇ m or less.
  • ⁇ 16> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 15>, which is an air-through non-woven fabric.
  • ⁇ 17> A hygienic product comprising the non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16>.
  • ⁇ 18> The hygienic product according to ⁇ 17>, wherein the hygienic non-woven fabric constitutes a surface facing the skin of the user of the hygienic product.
  • ⁇ 19> The hygienic product according to ⁇ 17> or ⁇ 18>, which is an absorbent article.
  • ⁇ 20> The hygiene product according to any one of ⁇ 17> to ⁇ 19>, wherein the hygiene non-woven fabric is arranged on the outer surface of the hygiene product.
  • ⁇ 21> The sanitary non-woven fabric or sanitary product according to any one of ⁇ 1> to ⁇ 20>, which is disposable.
  • the web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
  • the consolidation treatment is carried out at a surface pressure of 5 MPa or more, preferably 10 MPa or more, or 78.4 N / cm (8 kgf / cm) or more, more preferably 127.4 N / cm (13 kgf / cm) or more.
  • the method for producing a sanitary nonwoven fabric according to the above ⁇ 22> which is carried out at linear pressure and at 70 ° C. or higher and 120 ° C. or lower.
  • the consolidation treatment is carried out at a surface pressure of 30 MPa or less, preferably 20 MPa or less, or a linear pressure of 686 N / cm (70 kgf / cm) or less, more preferably 294 N / cm (30 kgf / cm) or less.
  • ⁇ 25> The method for producing a sanitary nonwoven fabric according to any one of ⁇ 22> to ⁇ 24>, wherein the consolidation treatment is performed at 80 ° C. or higher and 110 ° C. or lower.
  • ⁇ 26> In the air-through treatment, hot air having a melting point of -4 ° C or higher and a melting point of the resin of + 4 ° C or lower of the resin constituting the fiber surface is blown onto the web at a wind speed of 0.6 m / sec or higher and 2 m / sec or lower.
  • the air-through treatment is more preferably performed by blowing hot air having a melting point of -2 ° C. or higher and a melting point of + 2 ° C. or lower of the resin constituting the fiber surface onto the web, according to any one of ⁇ 22> to ⁇ 26>.
  • the method for producing a sanitary nonwoven fabric according to 1. The surface of the fiber is made of high-density polyethylene resin, The high-density polyethylene resin has a melting point of 130 ° C.
  • Non-woven fabric manufacturing method. ⁇ 29>
  • the surface of the fiber is made of high-density polyethylene resin, The high-density polyethylene resin has a melting point of 130 ° C.
  • a sanitary nonwoven fabric manufactured by the method for manufacturing a sanitary nonwoven fabric according to any one of ⁇ 22> to ⁇ 30> is used as one of the constituent materials.
  • ⁇ 32> The sanitary non-woven fabric according to any one of ⁇ 1> to ⁇ 16>, wherein the cool contact feeling q max is 0.06 W / m 2 or more.
  • ⁇ 33> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32>, wherein the presence ratio of the constituent fibers on the surface of the sanitary nonwoven fabric is 40% or more based on the area.
  • ⁇ 34> The sanitary nonwoven fabric according to any one of ⁇ 1> to ⁇ 16>, ⁇ 32>, and ⁇ 33>, wherein the volume filling rate is 10.0% or more.
  • the non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32> to ⁇ 34> and a second member arranged adjacent to the non-woven fabric are provided.
  • the second member is a sanitary product having a compressive deformation amount of 0.3 mm or more under a load of 9.8 mN / cm 2 (1 gf / cm 2).
  • ⁇ 36> The sanitary product according to ⁇ 35>, wherein the second member is a fiber aggregate different from the sanitary non-woven fabric.
  • ⁇ 37> The hygienic product according to ⁇ 36>, wherein the second member is an absorber.
  • ⁇ 38> The method for producing a non-woven fabric for hygiene according to any one of ⁇ 1> to ⁇ 16> and ⁇ 32> to ⁇ 34>.
  • the web of fibers, of which at least part of the surface is made of polyethylene resin, is air-through treated to obtain fiber aggregates, after which A method for producing a sanitary non-woven fabric, in which the fiber aggregate is compacted.
  • Examples 1 to 5 A flat and multi-leaf shape (hereinafter, this shape is also referred to as a "flat variant”) having a long axis and a short axis in cross-sectional shape, which is made of a single resin of HDPE, was used. ..
  • the ratio of the length of the major axis, the length of the minor axis, and the length of the minor axis to the length of the minor axis in the fiber cross section is , As shown in Table 1 below. First, the web of the fibers adjusted to have the basis weight shown in Table 1 below was air-through treated to obtain a non-woven fiber aggregate.
  • the conditions for the air-through treatment were as shown in Table 1 below. Then, by the press method, the fiber aggregate was compacted under the heating and pressurizing conditions shown in Table 1 below to obtain the desired sanitary non-woven fabric. All of the obtained non-woven fabrics were of a single layer.
  • Examples 6 to 8 In the same manner as in Examples 1 to 5, except that the basis weight was adjusted to be as shown in Table 1 below, and the consolidation treatment was performed by the calendar method under the heating and pressurizing conditions shown in Table 1 below. The desired sanitary non-woven fabric was obtained. All of the obtained non-woven fabrics were of a single layer.
  • Example 9 A core-sheath fiber having a core of PET, a sheath (fiber surface) of HDPE, and a cross-sectional shape of a perfect circle was used (hereinafter, this is also referred to as PET / HDPE fiber).
  • the polyethylene resin content of this fiber was 50% by mass.
  • the fiber web made of these fibers was subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric.
  • the obtained non-woven fabric was of a single layer.
  • Example 10 A fiber made of a single resin of HDPE and having a perfect circular cross-sectional shape was used.
  • the web of the fiber adjusted to have the basis weight shown in Table 1 below is manufactured by the spunbond method, and the web is compacted by embossing roll to obtain a sanitary nonwoven fabric made of spunbonded non-woven fabric. Obtained.
  • the conditions of the spunbond method are as shown in Table 1 below.
  • the obtained non-woven fabric was of a single layer.
  • Example 11 The desired sanitary non-woven fabric was obtained in the same manner as in Example 1 except that the consolidation treatment was not performed.
  • Example 12 to 14 A core-sheath fiber having a core of PP, a sheath (fiber surface) of HDPE, and a perfect circular cross-sectional shape was used (hereinafter, this is also referred to as PP / HDPE fiber).
  • the polyethylene resin content of this fiber was 50% by mass.
  • a web of the fibers adjusted to have the basis weight shown in Table 1 below is formed, and this web is subjected to air-through treatment and consolidation treatment under the same conditions as in Example 1 to obtain the desired sanitary non-woven fabric. Obtained. All of the obtained non-woven fabrics were of a single layer.
  • Example 1 A web of fibers was formed using the same core-sheath fibers as in Example 9, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
  • Example 2 A web of fibers was formed using the same core-sheath fibers as in Example 12, and air-through treatment was performed under the conditions shown in Table 1 below to obtain a desired sanitary non-woven fabric. In this comparative example, the consolidation treatment was not performed.
  • Example 3 A web of fibers is formed using the same core-sheath fibers as in Example 12, air-through treatment is performed under the conditions shown in Table 1 below, and then compaction by the calendar method is performed without heating under the conditions shown in Table 1 below. The chemical treatment was carried out to obtain the desired sanitary non-woven fabric.
  • the heating was performed based on the melting point of the resin having the highest melting point. Specifically, the non-woven fabric composed of HDPE-only fibers was heated at 150 ° C., the non-woven fabric composed of PP / HDPE fibers was heated at 180 ° C., and the non-woven fabric composed of PET / HDPE fibers was heated at 300 ° C. Next, when the gauge pressure of 200 kgf (total mass including the top plate: 21848 kg; pressure is calculated as the surface pressure) of the obtained fused product while maintaining the above-mentioned heating temperature, the area of the fused product is the melting of the resin.
  • the surface pressure is calculated based on the area of the finally obtained circular resin plate. For example, when the circular resin plate has a diameter of 15 cm, the surface pressure is 12 MPa.) After holding for 1 minute, the mixture was water-cooled to 20 ° C. while maintaining the pressurized state to obtain a circular resin plate having a diameter of about 15 to 20 cm (the diameter of the obtained circular resin plate changes depending on the melt viscosity of the resin). sell).
  • the circular resin plate was cut radially through the center, and further cut so as to be 5 cm or less if the maximum delivery length was 5 cm or more. Then, the cut resin plates are placed on top of each other in the center of the SUS plate so that the extending directions of the virtual line segments at the maximum delivery length are random so as to eliminate the influence of the resin orientation, and then the thickness is 1 mm.
  • Two shims were arranged in parallel at a position 10 cm from the center of the SUS plate, and the SUS plate was placed on the shims. After that, heating under no pressurization, and heating and cooling under pressurization were performed by the same operation as described above. When air bubbles entered, the same operation was repeated. The purpose of heating and melting twice is to melt the sample once, eliminate the influence of resin crystallization that changes during the fiber spinning process, and keep the thermal history constant. This gave a film.
  • the thermal conductivity was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.). First, the prepared film was cut into a circle with a diameter of 17 cm and left to stand in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Then, the thermal conductivity of the object to be measured was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, the temperature of the heat source body for measurement (BT-BOX, an aluminum plate measuring 5 cm in length ⁇ 5 cm in width and 1 mm in thickness and a heater, etc. are integrated) is set to 33 ° C. (from the surface temperature of the object to be measured).
  • BT-BOX an aluminum plate measuring 5 cm in length ⁇ 5 cm in width and 1 mm in thickness and a heater, etc. are integrated
  • the temperature was set to 10 ° C. higher), and the heat source body was brought into contact with the film so as to apply a load of 1 kg per 0.25 m 2 of area to prevent the film from warping and reducing the contact area. ..
  • the time when the heat flow rate from the heat source body to the measurement target became constant was set as the measurement start time point, and the average heat flow rate for 60 seconds from that time point was measured. It was calculated from the measurement conditions and the measured heat flow rate based on the following formula (I).
  • the film thickness D was an arithmetic mean value of the thickness measured at three or more points under no load by a laser displacement meter.
  • the above measurement was performed three times for each measurement target, and the maximum value of those measured values was taken as the thermal conductivity (W / mK) of the sample.
  • the results are shown in Table 1.
  • the thickness D and the thermal conductivity of the film produced by the above method using only PET and the film produced by the above method using only PP were measured.
  • the results are shown in Table 2 together with the results of Examples and Comparative Examples.
  • the cool contact feeling q max was measured by the following method using a measuring device (KES-F7 Thermolab II manufactured by Kato Tech Co., Ltd.).
  • a test piece was cut out from the sanitary non-woven fabric to be measured so as to have a size of 10 cm in length and 10 cm in width, and the test piece was left in an environment of room temperature of 23 ° C. and relative humidity of 50% for 24 hours. Then, in this environment, the test piece was placed on the measuring table, and the test piece was fixed to the measuring table using double-sided tape.
  • a constant temperature device using a gas or liquid as a heat medium was used as the measuring table.
  • the cool contact feeling q max of the measurement target was measured according to the above-mentioned measuring device and the measurement manual of the device. Specifically, a pure copper plate having an area of 9.0 cm 2 and a mass of 9.8 g is used as the heat plate to be brought into contact with the measurement target, and the initial temperature of the copper plate is 33 ° C. (a temperature 10 ° C higher than the surface temperature of the measurement target).
  • the contact pressure of the copper plate to the measurement target was set to 1 kPa, the copper plate was brought into contact with the test piece, and the value of the heat flow rate at the moment of the contact was set to zero, and the maximum value of the heat flow rate was measured.
  • the sanitary non-woven fabrics of each example have high thermal conductivity and volume filling rate, and also have a high contact cooling sensation q max, as compared with those of the comparative examples. It turns out. In particular, as shown in Examples 1 to 8, it can be seen that this effect becomes remarkable by using flat irregularly shaped fibers. Therefore, the sanitary nonwoven fabric of the present invention can perceive a feeling of coldness when it comes into contact with the skin of the user, and can give a comfortable feeling of use.
  • Example 15 and 16 The air-through non-woven fabric made of a single resin of HDPE used in Example 2 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 2.
  • Example 17 to 21 The air-through non-woven fabric made of a single resin of HDPE used in Example 4 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used as the second fiber layer. It was made into a fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers). The first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 4.
  • Example 22 The air-through non-woven fabric made of a single resin of HDPE used in Example 10 was used as the first fiber layer, and the single-layer air-through non-woven fabric made of PET / HDPE fibers adjusted to have the basis weight shown in Table 3 below was used. It was used as the second fiber layer. These fiber layers were laminated and joined with an adhesive to obtain a sanitary nonwoven fabric composed of a fiber sheet having a plurality of fiber layers (two layers).
  • the first fiber layer in this example has the same structure as the sanitary non-woven fabric of Example 10.
  • volume filling factor For the sanitary nonwoven fabric of the example, the volume filling rate (%) was calculated in the same manner as in the above method. The results are shown in Table 3 below. Table 3 reprints the results of only the sanitary non-woven fabrics in Examples 2, 4 and 10.
  • a feeling of coldness is as strong as that of a fiber sheet having a q max of 0.15 or more, and the feeling of coldness is very excellent.
  • the sanitary non-woven fabrics of each example have a high volume filling rate and a high contact cooling sensation q max, and can perceive an excellent cooling sensation.
  • the fiber surface abundance rate (%) was calculated by the above method.
  • the fiber surface abundance rate of Example 9 was 58%
  • the surface fiber abundance rate of Comparative Example 1 was 36%. Therefore, the fiber surface abundance rate of Example 9 is higher than that of Comparative Example 1, and the contact property of the fiber with respect to the contact object can be further enhanced. As a result, an excellent feeling of coldness can be perceived.
  • a sanitary non-woven fabric that perceives a feeling of coldness when it comes into contact with the skin and gives a comfortable feeling of use, and a hygienic product and an absorbent product provided with the non-woven fabric for hygiene.

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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)
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  • Textile Engineering (AREA)
  • Dermatology (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Ce tissu non tissé pour l'hygiène contient des fibres dont au moins une partie de la surface comprend une résine de polyéthylène et comporte un rapport de remplissage de volume d'au moins 3,5 %. Les fibres ont un axe long et un axe court, et il est préférable que le rapport de la longueur de l'axe long à celui de l'axe court soit de 1,5-10. Il est préférable que les fibres entrent en contact mutuel en une pluralité de points dans une section transversale du tissu non tissé. La présente invention concerne également un article absorbant pourvu du tissu non tissé pour l'hygiène. En outre, la présente invention concerne également un procédé de fabrication du tissu non tissé pour l'hygiène, dans lequel un traitement par circulation d'air et un traitement de consolidation sont appliqués à une bande de fibres, dont au moins une partie de la surface comprend une résine de polyéthylène.
PCT/JP2021/016278 2020-04-22 2021-04-22 Tissu non tissé pour l'hygiène, produit hygiénique et article absorbant pourvu de celui-ci, et procédé de fabrication de tissu non tissé pour l'hygiène Ceased WO2021215492A1 (fr)

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