WO2022113711A1 - スパンボンド不織布およびこれを具備してなる衛生材料 - Google Patents

スパンボンド不織布およびこれを具備してなる衛生材料 Download PDF

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Publication number
WO2022113711A1
WO2022113711A1 PCT/JP2021/040939 JP2021040939W WO2022113711A1 WO 2022113711 A1 WO2022113711 A1 WO 2022113711A1 JP 2021040939 W JP2021040939 W JP 2021040939W WO 2022113711 A1 WO2022113711 A1 WO 2022113711A1
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WIPO (PCT)
Prior art keywords
nonwoven fabric
fiber
propylene
spunbonded nonwoven
based 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/JP2021/040939
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English (en)
French (fr)
Japanese (ja)
Inventor
勝田大士
森岡英樹
梶原健太郎
船津義嗣
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Toray Industries Inc
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Toray Industries Inc
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Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to KR1020237017052A priority Critical patent/KR20230107820A/ko
Priority to JP2021568257A priority patent/JP7815763B2/ja
Priority to CN202180077481.4A priority patent/CN116546949A/zh
Publication of WO2022113711A1 publication Critical patent/WO2022113711A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/009—Condensation or reaction polymers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Ethylene-propylene or ethylene-propylene-diene copolymers
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/30—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising olefins as the major constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/018—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the shape
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene

Definitions

  • the present invention relates to a spunbonded nonwoven fabric having excellent flexibility in addition to water absorption and quick-drying to maintain comfort when worn, and a sanitary material provided with the same at least in part.
  • a laminated non-woven fabric having a laminated structure of fiber layers containing long fibers for the purpose of imparting water absorption and quick-drying properties to the non-woven fabric, the distance between the hydrophobic layer containing the hydrophobic fibers and the flatness and flatness.
  • a laminated nonwoven fabric composed of a hydrophilic layer containing hydrophilic fibers in a specific range and having the hydrophobic layer arranged on the surface of the nonwoven fabric (see Patent Document 1).
  • Patent Document 2 and Patent Document 3 both relate to a spunbonded nonwoven fabric using polypropylene modified by a polymer blend or an additive.
  • the spunbonded non-woven fabric has insufficient water absorption and quick-drying property.
  • an object of the present invention is to provide a spunbonded nonwoven fabric having excellent flexibility in addition to water absorption and quick-drying to maintain comfort when worn, and a sanitary material provided with the same at least in part. It is in.
  • the spunbonded nonwoven fabric of the present invention has the following constitution. That is, A spunbonded nonwoven fabric in which one surface (A) is made of fibers (Fa) made of propylene resin and the other surface (B) is made of fibers (Fb) made of propylene resin. A spunbonded nonwoven fabric having a crystal melting heat of 30 J / g or more and 98 J / g or less in the differential scanning calorimetry and satisfying the following formula (1).
  • Da is the average single fiber diameter ( ⁇ m) of the fiber (Fa)
  • Db is the average single fiber diameter ( ⁇ m) of the fiber (Fb).
  • the sanitary material of the present invention is a sanitary material provided with at least a part of the above-mentioned spunbonded nonwoven fabric.
  • the spunbonded nonwoven fabric of the present invention is preferably a propylene-based resin in which at least a part of the propylene-based resin is copolymerized with an ethylene unit of 2 mol% or more and 30 mol% or less.
  • the propylene-based resin is a propylene-based resin having a mesopentad fraction of 50% or more and 92% or less.
  • the spunbonded nonwoven fabric of the present invention is preferably a propylene-based resin in which at least a part of the propylene-based resin contains 0.5% by mass or more of a fatty acid amide compound.
  • the contact angle of the surface (A) with water and the contact angle of the surface (B) with water are both 30 ° or less.
  • the spunbonded nonwoven fabric of the present invention at least a part of the fiber (Fa) and / or the fiber (Fb) has a plurality of convex portions in the fiber cross section, and the degree of roval of the fiber cross section is 5.0%. It is preferable to use the above-mentioned irregular cross-section fiber.
  • the surface (B) is arranged toward the skin side of the wearer.
  • the spunbonded non-woven fabric of the present invention can be used as a part of sanitary materials such as disposable diapers, menstrual napkins, gauze, bandages, masks, gloves, and adhesive plasters.
  • one surface (A) is composed of fibers (Fa) made of a propylene resin
  • the other surface (B) is made of fibers (Fb) made of a propylene resin. Therefore, the heat of crystal melting in the differential scanning calorimetry is 30 J / g or more and 98 J / g or less, and the following formula (1) is satisfied.
  • Da is the average single fiber diameter ( ⁇ m) of the fiber (Fa)
  • Db is the average single fiber diameter ( ⁇ m) of the fiber (Fb).
  • the surface (A) refers to the surface of the two surfaces of the spunbonded nonwoven fabric on the side where the average single fiber diameter of the constituent fibers measured by the method described later is smaller.
  • one surface (A) is composed of fibers (Fa) made of a propylene resin
  • the other surface (B) is made of fibers (Fb) made of a propylene resin.
  • one surface (A) and the other surface (B) are both composed of fibers made of a propylene-based resin.
  • the spunbonded nonwoven fabric of the present invention has a laminated structure of a nonwoven fabric layer made of fibers (Fa) made of propylene-based resin and a nonwoven fabric layer made of fibers (Fb) made of propylene-based resin. ing.
  • the "propylene-based resin” means a resin having a propylene unit as a main repeating unit.
  • examples of the propylene-based resin include homopolymers of propylene, copolymers of propylene and ethylene, copolymers of propylene and various ⁇ -olefins, and mixtures of these polymers.
  • the ⁇ -olefin includes 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-hexadecene, 4-methyl-1-pentene and the like.
  • a copolymer of propylene and ethylene is preferably used because it has excellent process stability in the spinning process and also has excellent flexibility when made into a fiber.
  • the above propylene resin is an inorganic substance such as titanium oxide, silica, barium oxide, calcium carbonate, carbon black, a colorant such as a dye or a pigment, a flame retardant, a fluorescent whitening agent, an antioxidant, or an ultraviolet absorber. It may contain various additives such as.
  • the propylene-based resin is preferably a propylene-based resin in which at least a part thereof is copolymerized with an ethylene unit of 2 mol% or more and 30 mol% or less.
  • the copolymerization rate of each ethylene unit is preferably 2 mol% or more, more preferably 3 mol% or more, the spunbonded nonwoven fabric has excellent flexibility in addition to improving the process stability in the spinning process. ..
  • the copolymerization rate of ethylene units to preferably 30 mol% or less, more preferably 25 mol% or less, still more preferably 20 mol% or less, it becomes possible to suppress the stickiness of the spunbonded nonwoven fabric, which is excellent. It is a spunbonded non-woven fabric that has a soft feel.
  • the propylene-based resin is a propylene-based resin having a mesopentad fraction of 50% or more and 92% or less.
  • the mesopentad fraction By setting the mesopentad fraction to preferably 50% or more, more preferably 60% or more, still more preferably 70% or more, it becomes possible to suppress the stickiness of the spunbonded nonwoven fabric, and the spunbonded nonwoven fabric having an excellent tactile sensation can be obtained.
  • the mesopentad fraction to 92% or less, more preferably 90% or less, it is possible to obtain a spunbonded nonwoven fabric having excellent flexibility in addition to improving the process stability in the spinning process. ..
  • the mesopentad fraction (%) referred to here is obtained as follows.
  • 13 C-NMR measurement is performed on the obtained solution.
  • the spectrum derived from the methyl group of the obtained NMR spectrum appears at 21.70 ppm or more and 21.90 ppm or less.
  • Each peak is assigned with the peak as a peak caused by the mesopentad chain, and the ratio to the peak intensity caused by the mesopentad chain to the total sum of all peak intensities derived from the methyl group is calculated as a percentage to calculate the mesopendad fraction. Is rounded off.
  • the propylene-based resin is preferably a propylene-based resin in which at least a part thereof contains 0.5% by mass or more of a fatty acid amide compound.
  • the fatty acid amide compound acts as a lubricant on the fiber surface. Therefore, it becomes a spunbonded non-woven fabric having an excellent tactile sensation.
  • the upper limit of the content of the fatty acid amide compound in the present invention is not particularly limited, but is preferably 5.0% by mass or less from the viewpoint of cost and productivity.
  • the fatty acid amide compound when the propylene-based resin contains the fatty acid amide compound, the fatty acid amide compound preferably has 15 or more carbon atoms and 50 or less carbon atoms.
  • the fatty acid amide compound having 15 or more and 50 or less carbon atoms include a saturated fatty acid monoamide compound, a saturated fatty acid diamide compound, an unsaturated fatty acid monoamide compound, and an unsaturated fatty acid diamide compound.
  • the number of carbon atoms in the present invention means the number of carbon atoms contained in the molecule.
  • the number of carbon atoms of the fatty acid amide compound By setting the number of carbon atoms of the fatty acid amide compound to preferably 15 or more, more preferably 23 or more, and further preferably 30 or more, it is possible to suppress excessive precipitation of the fatty acid amide compound on the fiber surface, resulting in spinnability and processing stability. It is excellent in and can maintain high productivity. Further, by setting the number of carbon atoms of the fatty acid amide compound to preferably 50 or less, more preferably 45 or less, still more preferably 42 or less, the fatty acid amide compound is appropriately precipitated on the fiber surface, so that the spunbonded non-woven fabric has an excellent tactile sensation. Will be.
  • the fiber (Fa) and / or the fiber (Fb) made of a propylene-based resin may be not only a single component fiber but also a composite fiber in which two or more kinds of resins are composited.
  • the fiber made of the propylene-based resin is a composite fiber
  • the composite form is not particularly limited as long as the effect of the present invention is not impaired, and a core sheath type, a sea island type, a side-by-side type, an eccentric core sheath type, etc. It can be appropriately selected from a blend type and the like.
  • the resin used together with the propylene-based resin is mainly a repeating unit of ethylene unit or propylene unit from the viewpoint of process stability and flexibility in the manufacturing process.
  • the above-mentioned olefin-based resin is preferably used.
  • the core component is the propylene-based resin
  • the sheath component is the olefin-based resin
  • the sea component is the olefin-based resin.
  • the island component may be the above-mentioned propylene-based resin or the like.
  • a spunbonded non-woven fabric having an excellent tactile sensation can be obtained by using the above-mentioned propylene-based resin as the core component and using an olefin-based resin having an ethylene unit as the main repeating unit as the sheath component to form a core-sheath type composite fiber. ..
  • At least a part of the fiber (Fa) and / or the fiber (Fb) made of a propylene resin has a plurality of convex portions in the fiber cross section.
  • a plurality of convex portions in the fiber cross section continuous grooves are formed on the side surface of the fiber in the fiber axial direction, and the groove portion serves as a liquid passage path, so that the spunbonded nonwoven fabric has excellent water absorption.
  • FIG. 1 shows an example of a fiber cross section having a plurality of convex portions.
  • the fiber (Fa) and / or the fiber (Fb) made of a propylene-based resin has a plurality of convex portions in the fiber cross section, and the degree of roval of the fiber cross section is high. It is preferably 5.0% or more.
  • the roval degree of the fiber cross section is preferably 5.0% or more, more preferably 10.0% or more, the moisture diffusion efficiency in the surface direction of the spunbonded nonwoven fabric is increased, so that the span has excellent water absorption. It becomes a bonded non-woven fabric.
  • the upper limit of the degree of roval is not particularly limited, it is preferably 60.0% or less from the viewpoint of suppressing peeling of the convex portion due to friction during manufacturing and obtaining a high-quality spunbonded nonwoven fabric.
  • the degree of roval of the fiber cross section referred to here is measured by the method described below, and will be described in detail with reference to FIG.
  • FIG. 2 shows an example of a cross section of a fiber made of a propylene-based resin constituting the spunbonded nonwoven fabric of the present invention.
  • a line for example, L 22
  • L 22 a line parallel to the straight line (L 21 ) and having only one intersection (V 21 ) between the points S 21 and 22 in the contour (C 2 ) is drawn.
  • the distance b between this straight line (L 21 ) and the straight line (L 22 ) is measured.
  • the percentage of the ratio of b to a (b / a ⁇ 100) is obtained. This is arbitrarily extracted and measured for 20 fibers constituting the same surface, a simple arithmetic mean value is obtained, and the value rounded to the second decimal place is defined as the roval degree (%) in the present invention.
  • the contact angle of the fiber (Fa) made of a propylene resin with water and the contact angle of the fiber (Fb) with water are both less than 90 °.
  • the contact angle with water in the fiber made of propylene resin is an index different from the contact angle with water on the surface of the spunbonded nonwoven fabric described later, and if the contact angle is 90 ° or more, it is hydrophobic and less than 90 °. If so, the fiber made of the propylene-based resin becomes hydrophilic.
  • the contact angle of the fiber made of the propylene resin of the present invention with water is, for example, the fiber made of the propylene resin taken out from the spunbonded non-woven fabric left in a room at room temperature of 20 ° C. and relative humidity of 65% for 24 hours or more.
  • the fiber made of the propylene resin taken out from the spunbonded non-woven fabric left in a room at room temperature of 20 ° C. and relative humidity of 65% for 24 hours or more.
  • the heat composed of the fiber (Fa) made of the propylene-based resin on the surface (A) and the fiber (Fb) made of the propylene-based resin on the surface (B) is not beyond the gist of the present invention.
  • the plastic resin, fiber cross section, and the like may be the same or different.
  • the surface (A) is composed of the fibers (Fa) made of the propylene-based resin.
  • the spunbonded nonwoven fabric of the present invention is preferably made of long fibers as in a conventional method, that is, the fibers (Fa) are preferably long fibers. This is because the spunbonded non-woven fabric having both high productivity and excellent mechanical characteristics can be easily formed by being made of long fibers.
  • the average single fiber diameter (Da) of the fiber (Fa) made of the propylene-based resin constituting the surface (A) of the present invention is preferably 1.0 ⁇ m or more and 25.0 ⁇ m or less.
  • the average single fiber diameter (Da) is preferably 1.0 ⁇ m or more, more preferably 3.0 ⁇ m or more, and further preferably 5.0 ⁇ m or more, the arrangement of fibers becomes dense when used as a sanitary material. However, when it is used for disposable diapers, it becomes easy for water to transfer to the adjacent water absorber.
  • the average single fiber diameter (Da) is preferably 25.0 ⁇ m or less, more preferably 20.0 ⁇ m or less, still more preferably 16.0 ⁇ m or less, it is easy to obtain high capillary force and has excellent water absorption. It becomes a spunbonded non-woven fabric.
  • the average single fiber diameter (Da) ( ⁇ m) of the fiber (Fa) made of a propylene-based resin referred to here is obtained as follows. (1) An image is taken of the cross section of the fiber constituting the surface (A) at a magnification at which one fiber can be observed with a scanning electron microscope. (2) Using the captured image, use image analysis software (for example, "WinROOF2015” manufactured by Mitani Shoji Co., Ltd.) to measure the area Af ( ⁇ m 2 ) formed by the cross-sectional contour of the single fiber, and use this area Af. Calculate the diameter of a perfect circle with the same area. (3) This is arbitrarily extracted and measured for 20 fibers constituting the same surface, a simple arithmetic mean value is obtained, the average single fiber diameter (Da) is calculated, and the second decimal place is rounded off.
  • image analysis software for example, "WinROOF2015” manufactured by Mitani Shoji Co., Ltd.
  • the surface (B) is composed of the fibers (Fb) made of the propylene-based resin.
  • the spunbonded nonwoven fabric of the present invention is preferably made of long fibers as in a conventional method, and the constituent fibers (Fb) on the surface (B) are preferably long fibers. This is because the spunbonded non-woven fabric having both high productivity and excellent mechanical characteristics can be easily formed by being made of long fibers.
  • the average single fiber diameter (Db) of the fibers (Fb) constituting the surface (B) of the present invention is preferably 3.0 ⁇ m or more and 30.0 ⁇ m or less.
  • the average single fiber diameter (Db) is preferably 3.0 ⁇ m or more, more preferably 5.0 ⁇ m or more, and further preferably 10.0 ⁇ m or more.
  • moisture can be easily transferred to the surface (A) and quick-drying. It becomes an excellent spunbonded non-woven fabric.
  • the average single fiber diameter (Db) to preferably 30.0 ⁇ m or less, more preferably 28.0 ⁇ m or less, still more preferably 25.0 ⁇ m or less, a spunbonded nonwoven fabric having excellent flexibility can be obtained.
  • the average single fiber diameter (Db) ( ⁇ m) of the fiber (Fb) made of the propylene resin referred to here is obtained as follows. (1) An image is taken of the cross section of the fiber constituting the surface (B) at a magnification at which one fiber can be observed with a scanning electron microscope. (2) Using the captured image, use image analysis software (for example, "WinROOF2015” manufactured by Mitani Shoji Co., Ltd.) to measure the area Af ( ⁇ m 2 ) formed by the cross-sectional contour of the single fiber, and use this area Af. Calculate the diameter of a perfect circle with the same area. (3) This is arbitrarily extracted and measured for 20 fibers constituting the same surface, a simple arithmetic mean value is obtained, the average single fiber diameter (Db) is calculated, and the second decimal place is rounded off.
  • image analysis software for example, "WinROOF2015” manufactured by Mitani Shoji Co., Ltd.
  • one surface (A) is composed of fibers (Fa) made of a propylene-based resin
  • the other surface (B) is made of fibers (Fb) made of a propylene-based resin. It is a spunbonded nonwoven fabric and satisfies the following formula (1).
  • Da is the average single fiber diameter ( ⁇ m) of the fiber (Fa)
  • Db is the average single fiber diameter ( ⁇ m) of the fiber (Fb).
  • Db / Da in the formula (1) is calculated from the average single fiber diameter (Da) and the average single fiber diameter (Db) obtained by using the above-mentioned method, and can be obtained by rounding off to the second decimal place. can.
  • the size of the voids woven by the fibers changes according to the average single fiber diameter of the constituent fibers. Therefore, when layers having different average single fiber diameters are formed, layers having different interfiber void sizes are formed, and when moisture adheres, a layer made of thick fibers is formed due to the difference in capillary force. The absorbed moisture can be transferred to a layer of fine fibers. Furthermore, as a result of diligent studies by the present inventors, by setting the Db / Da in a specific range, not only the water absorption improving effect due to the difference in the capillary effect but also the quick-drying property on the surface (B) made of thick fibers is obtained. Found to be granted.
  • the upper limit of the average single fiber diameter ratio in the present invention is not particularly limited, but is preferably 10.0 or less from the viewpoint of process stability and productivity.
  • the spunbonded nonwoven fabric of the present invention has a crystal melting heat of 30 J / g or more and 98 J / g or less in the differential scanning calorimetry.
  • the amount of heat of crystal melting is set to 30 J / g or more, preferably 40 J / g or more, more preferably 50 J / g or more, still more preferably 60 J / g or more, it becomes possible to suppress the stickiness of the spunbonded nonwoven fabric, which is excellent. It is a spunbonded non-woven fabric that has a soft feel.
  • a spunbonded nonwoven fabric having excellent flexibility can be obtained.
  • Db / Da which is the ratio of the average single fiber diameter (Db) to the average single fiber diameter (Da)
  • Db the average single fiber diameter
  • Da the average single fiber diameter
  • the surface (B) having a large average single fiber diameter is arranged on the skin side of the wearer, so that the tactile sensation is also inferior.
  • the present inventors have found that the flexibility and tactile sensation of the spunbonded nonwoven fabric depend on the amount of heat of crystal melting of the spunbonded nonwoven fabric. That is, by reducing the amount of heat of crystal melting of the spunbonded nonwoven fabric, the crystallinity of the spunbonded nonwoven fabric is lowered, and even if the Db / Da is 1.1 or more, the spunbonded nonwoven fabric has excellent flexibility. ..
  • the amount of heat for melting the crystals is reduced too much, the flexibility is improved, but the proportion of amorphous is too large, so that the spunbonded nonwoven fabric becomes sticky and the tactile sensation tends to deteriorate. Therefore, in the present invention, it is important to set the amount of heat of crystal melting to a specific range in order to achieve both flexibility and tactile sensation.
  • the amount of heat of crystal melting of the spunbonded nonwoven fabric can be controlled by the copolymerization ratio of the propylene resin, the mesopentad fraction, the content of various additives, and the like. For example, when the copolymerization ratio is increased or the mesopentad fraction is decreased, the amount of heat of crystal melting tends to decrease.
  • the amount of heat of crystal melting (J / g) in the differential scanning calorimetry referred to here is obtained as follows.
  • a spunbonded nonwoven fabric of about 2 mg is set in a differential scanning calorimeter, and differential scanning calorimetry is carried out under the conditions of a temperature rise rate of 16 ° C./min and a measurement temperature range of 50 to 200 ° C. under nitrogen.
  • the amount of heat of crystal melting is calculated from the area of the endothermic peak in the obtained measurement result (DSC curve). When a plurality of endothermic peaks are observed, the amount of heat of crystal melting is calculated from the total value of the areas of all endothermic peaks.
  • the measurement position is changed for each level, the measurement is performed three times, a simple arithmetic mean value is obtained, the amount of heat of crystal melting is calculated, and the first decimal place is rounded off.
  • the contact angle of the surface (A) with water and the contact angle of the surface (B) with water are both 30 ° or less.
  • the contact angle with water is hydrophilic, so that the moisture in contact with the surface becomes the spunbonded nonwoven fabric. It is a spunbonded non-woven fabric that easily absorbs water and has excellent water absorption.
  • the lower limit of the contact angle with water in the present invention is 0 °, but the contact angle with water of 0 ° means a state in which all the water is absorbed by the spunbonded non-woven fabric in the measurement method described later.
  • the contact angle with water can be controlled by the hydrophilicity of the propylene-based resin used for the fibers constituting the spunbonded nonwoven fabric and the addition of a hydrophilic oil agent in a subsequent process.
  • the higher the hydrophilicity of the thermoplastic resin and the larger the amount of the hydrophilic oil agent adhered to the resin the smaller the contact angle with water tends to be.
  • the contact angles (°) of the surface (A) and the surface (B) of the spunbonded non-woven fabric referred to here with water are determined as follows. (1) The spunbonded nonwoven fabric is left in a room at room temperature of 20 ° C. and relative humidity of 65% for 24 hours or more. (2) The spunbonded nonwoven fabric subjected to the above treatment is set on the stage of the contact angle meter installed in the same room so that the surface (A) becomes the measurement surface. (3) A 2 ⁇ L droplet composed of ion-exchanged water is prepared at the needle tip and liquidated on a spunbonded non-woven fabric. (4) The contact angle with the droplet is obtained from the image 2 seconds after the droplet has landed on the spunbonded nonwoven fabric.
  • the spunbonded non-woven fabric of the present invention has the highest breaking strength with respect to the lowest breaking strength ⁇ min measured by rotating in the plane of the spunbonded non-woven fabric up to 180 ° every 22.5 ° with 0 ° in any one direction. It is preferable that the ratio of breaking strength ⁇ max ( ⁇ max / ⁇ min , hereinafter, may be simply abbreviated as breaking strength ratio) is 1.2 or more and 4.0 or less. By setting the breaking strength ratio to preferably 1.2 or more, more preferably 1.3 or more, the fibers are oriented in any direction in the surface of the spunbonded nonwoven fabric, so that the water absorbed by the capillary effect is absorbed by the fibers.
  • breaking strength ratio preferably 4.0 or less, more preferably 3.5 or less, an extremely low angle of breaking strength is eliminated, so that tearing of the non-woven fabric during process passage or product processing is suppressed. be able to.
  • the breaking strength ratio of the spunbonded nonwoven fabric referred to here is determined as follows based on "6.3 Tensile strength and elongation (ISO method)" of JIS L 1913: 2010 "General nonwoven fabric test method". It is a thing. (1) Set any one direction of the spunbonded nonwoven fabric to 0 °, cut out a test piece having a length of 300 mm and a width of 25 mm so that the vertical direction coincides with the above direction, change the location, and collect three test pieces. (2) Grasp the test piece and set it in the tensile tester with an interval of 200 mm.
  • a tensile test is carried out at a tensile speed of 100 m / min, the strength [N] at break is obtained for the three collected test pieces, and the arithmetic mean value thereof is defined as the breaking strength ⁇ .
  • the axial direction is the direction rotated clockwise by 22.5 ° in the plane of the spunbonded non-woven fabric with respect to any one direction set to 0 °, and the vertical direction coincides with the above axial direction. Cut out a test piece of 300 mm ⁇ 25 mm in width, change the location, and collect three test pieces. After that, the above operations (2) to (3) are performed to calculate the breaking strength ⁇ .
  • the spunbonded nonwoven fabric of the present invention contains another nonwoven fabric layer composed of fibers other than the fibers made of the propylene-based resin constituting the surface (A) and the surface (B), as long as the effects of the present invention are not impaired. You can go out.
  • a non-woven fabric layer composed of fibers other than the fibers made of the propylene-based resin constituting the surface (A) and the surface (B) is included, the non-woven fabric layer is hydrophilic, so that the water absorption of the spunbonded non-woven fabric as a whole is increased. It is preferable in that it does not impair.
  • nonwoven fabric layer examples include spunbonded nonwoven fabrics and merlo blown nonwoven fabrics made of propylene-based resin fibers having different fiber diameters, spunbonded nonwoven fabrics made of fibers other than propylene-based resin fibers, and melt-blow nonwoven fabrics.
  • the spunbonded nonwoven fabric of the present invention preferably has a water absorption rate of 20 seconds or less measured on the surface (B).
  • the non-woven fabric has good performance of removing water adhering to the surface, that is, excellent water absorption and quick-drying property.
  • the water absorption rate (seconds) referred to here is obtained based on "7.1.1 Dropping method” of JIS L 1907: 2010 "Water absorption test method for textile products”. A drop of water is dropped on the surface (B) of the spunbonded non-woven fabric, the time until it is absorbed and the mirror reflection on the surface disappears is measured, and a simple numerical average value of the values measured at 10 different points is obtained. Calculate the water absorption rate and round off the first digit.
  • the basis weight of the spunbonded nonwoven fabric of the present invention is preferably 5 g / m 2 or more and 200 g / m 2 or less.
  • the basis weight is preferably 5 g / m 2 or more, more preferably 8 g / m 2 or more, and further preferably 10 g / m 2 or more.
  • a spunbonded nonwoven fabric having mechanical strength that can be put into practical use can be obtained.
  • the basis weight to preferably 200 g / m 2 or less, more preferably 150 g / m 2 or less, and further preferably 100 g / m 2 or less. It becomes a spunbonded non-woven fabric having.
  • the basis weight (g / m 2 ) referred to here is obtained based on "6.2 Mass per unit area" of JIS L 1913: 2010 "General non-woven fabric test method”. Three 20 cm x 25 cm test pieces were collected per 1 m of sample width, the mass (g) of each was measured in the standard state, and the mass per 1 m 2 was obtained from the simple arithmetic mean of the measured values. Calculate and round off to the first decimal place.
  • the nonwoven fabric layer made of fibers (Fa) constituting the surface (A) and the nonwoven fabric layer made of fibers (Fb) constituting the surface (B) are integrated.
  • integrated means that these non-woven fabric layers are joined by entanglement of fibers, fixing by components such as an adhesive, and fusion of thermoplastic resins constituting each layer.
  • the spunbonded nonwoven fabric of the present invention may be provided with a hydrophilic agent for the purpose of increasing water absorption.
  • a hydrophilic agent for the purpose of increasing water absorption.
  • examples of the type of the hydrophilizing agent include surfactants, and among them, nonionic surfactants are preferable.
  • the sanitary material of the present invention comprises at least a part of the above-mentioned spunbonded nonwoven fabric. By doing so, a sanitary material having excellent water absorption and quick-drying properties and comfort when worn can be obtained.
  • the sanitary material referred to here is mainly a disposable item used for health-related purposes such as medical care and long-term care.
  • Examples of the sanitary material of the present invention include paper diapers, menstrual napkins, gauze, bandages, masks, gloves, adhesive plasters, and the like, and the constituent members thereof, for example, paper diapers include top sheets, back sheets, side gathers, and the like. ..
  • the sanitary material in which the surface (B) is arranged toward the skin side of the wearer can immediately absorb the moisture adhering to the skin surface side into the inside of the spunbonded non-woven fabric, which is not suitable for the wearer. It is more preferable because it can reduce the pleasant sensation.
  • the sanitary material is a disposable diaper and the spunbonded non-woven fabric is used for the top sheet of the disposable diaper
  • the surface (B) when the surface (B) is arranged toward the skin side of the wearer, sweat or excretion generated during wearing is performed.
  • the urine is quickly absorbed and the liquid is rapidly transferred to the surface (A), so that the surface (B) can be kept smooth without excessive dampness.
  • the sanitary material is a mask and a spunbonded non-woven fabric is used for the inner layer of the mask
  • the surface (B) is arranged toward the wearer's skin side, sweat and exhaled air are condensed and the skin surface is exposed. Even if moisture adheres to the surface (B) arranged on the side, it is immediately absorbed inside the spunbonded non-woven fabric, and the surface (B) can be kept in a smooth state without excessive dampness.
  • the spunbond method is used as the method for producing the surface (A) and the surface (B) constituting the spunbonded nonwoven fabric of the present invention. Further, when a nonwoven fabric layer composed of fibers other than the fibers constituting the surface (A) and the surface (B) is included, the method for producing the nonwoven fabric layer is known as a spunbond method, a melt blow method, a short fiber card method or the like. You can choose from the manufacturing methods.
  • the spunbond method is a method in which a thermoplastic resin, which is a raw material, is melted, spun from a spinneret, and then cooled and solidified. The resulting yarn is pulled by an ejector, stretched, and collected on a moving net. This is a method for producing a non-woven fabric, which requires a step of heat-bonding after forming a fiber web.
  • the raw material used may be a single component, but when two or more different types of resins are used, they may be pre-kneaded, dry-blended, or separately weighed and put into the extruder.
  • a method of separately weighing a propylene-based resin in which an ethylene unit is copolymerized with a propylene homopolymer and charging the resin into an extruder can be mentioned.
  • various shapes such as a round shape and a rectangular shape can be adopted as the shape of the spinneret and the ejector used.
  • the spinning temperature is + 10 ° C. or higher for the melting temperature of the thermoplastic resin as a raw material and + 120 ° C. or lower for the melting temperature of the thermoplastic resin as a raw material. That is, when a propylene-based resin is used, it can be said that a preferable range is approximately 170 ° C. or higher and 280 ° C. or lower. By setting the spinning temperature within the above range, a stable molten state can be obtained and excellent spinning stability can be obtained.
  • the spun yarn is then cooled.
  • a method of cooling the spun yarn for example, a method of forcibly blowing cold air on the yarn, a method of naturally cooling at the atmospheric temperature around the yarn, and a method of adjusting the distance between the spinneret and the ejector. Etc., or a method of combining these methods can be adopted. Further, the cooling conditions can be appropriately adjusted in consideration of the discharge amount per single hole of the spinneret, the spinning temperature, the atmospheric temperature and the like.
  • the cooled and solidified yarn is towed and stretched by the compressed air ejected from the ejector.
  • the spunbonded nonwoven fabric of the present invention it is important to control the average single fiber diameter of the propylene-based resin fibers constituting the surface (A) and the surface (B).
  • the average single fiber diameter of fibers made of propylene-based resin is determined by the discharge rate and traction speed per discharge hole of the spinneret, that is, the spinning speed. Therefore, it is preferable to determine the discharge amount and the spinning speed according to the desired average single fiber diameter.
  • the spinning speed is preferably 2,000 m / min or more, more preferably 3,000 m / min or more.
  • the long fiber yarns stretched by traction in this way are collected by a moving net to form a sheet, and then subjected to a process of heat bonding.
  • the spunbonded nonwoven fabric of the present invention is made of a propylene-based resin fiber having a single fiber diameter different from that of the surface (A) and the surface (B), that is, a nonwoven fabric layer made of fibers constituting the surface (A) and the surface (B). It is a spunbonded nonwoven fabric in which a nonwoven fabric layer composed of fibers constituting the above is laminated.
  • the surface (A) is formed on a collection net by a spunbond method.
  • a method of continuously collecting in-line a non-woven fabric layer made of fibers constituting the surface (B) on the non-woven fabric layer made of fibers and laminating and integrating the surface (A) by adhesion is used.
  • a method of obtaining a non-woven fabric layer made of constituent fibers and a non-woven fabric layer made of fibers constituting the surface (B) separately in advance, superimposing both non-woven fabric layers offline, and laminating and integrating them by adhesion is adopted. Can be done.
  • it since it is excellent in productivity, it is composed of fibers constituting the surface (B) by the spunbonding method on a non-woven fabric layer composed of fibers constituting the surface (A) by the spunbonding method on the collection net.
  • a method of continuously collecting the non-woven fabric layers in-line and laminating and integrating them by adhesion is preferable.
  • thermocompression bonding such as ultrasonic bonding in which heat welding is performed by ultrasonic vibration of the horn can be adopted.
  • the spunbonded nonwoven fabric of the present invention is produced by thermocompression bonding, it is preferable because the mechanical strength of the spunbonded nonwoven fabric is increased by sufficiently adhering a plurality of nonwoven fabric layers.
  • the spunbonded nonwoven fabric of the present invention is produced by the air-through method, it is preferable because it is bulky and has an excellent texture.
  • hydrophilic agent it is preferable to add a hydrophilic agent to the spunbonded nonwoven fabric thus obtained before winding.
  • the method for applying the hydrophilizing agent to the spunbonded non-woven fabric include application by kiss roll or spray, dip coating and the like.
  • a method for applying the hydrophilic agent to the spunbonded nonwoven fabric it is preferable to apply it by kiss roll from the viewpoint of uniformity and ease of controlling the amount of adhesion.
  • the present invention will be described in detail based on examples. However, the present invention is not limited to these examples.
  • the one without any special description is the one obtained by the measurement based on the above-mentioned method.
  • test piece was set in a tensile tester with a grasping interval of 200 mm.
  • the axial direction is the direction rotated clockwise by 22.5 ° in the plane of the laminated non-woven fabric with respect to any one direction set to 0 °, so that the vertical direction coincides with the above axial direction. Cut out a test piece having a length of 300 mm and a width of 25 mm, change the location, and collect three test pieces. After that, the above operations (8.2) to (8.3) were performed to calculate the breaking strength ⁇ .
  • Example 1 (Fiber web constituting surface (A)) A propylene resin having a copolymerization rate of 3 mol% and a mesopentad fraction of 95% in ethylene units is melted by an extruder, and a single hole discharge amount is 0. It was spun at 3 g / min. The spinning temperature at this time was 230 ° C. After the spun yarn is cooled and solidified by cold air, it is pulled and stretched at a spinning speed of 3700 m / min by compressed air with a pressure at the ejector of 0.08 MPa in a rectangular ejector, and is captured on a moving net. Collected to get a textile web. The average single fiber diameter Da of the propylene-based resin fibers constituting the obtained surface (A) was 10.6 ⁇ m.
  • the fiber web thus obtained is made of metal on the lower roll by using a metal embossed roll arranged in a so-called quilting pattern, which is a lattice pattern in which a straight line pattern formed by a perfect circular convex portion is orthogonal to the upper roll.
  • a metal embossed roll arranged in a so-called quilting pattern, which is a lattice pattern in which a straight line pattern formed by a perfect circular convex portion is orthogonal to the upper roll.
  • heat fusion is performed at a linear pressure of 300 N / cm and a heat fusion temperature of 125 ° C.
  • a bonded non-woven material was obtained.
  • a nonionic surfactant as a hydrophilizing agent was applied to the nonwoven fabric using kissroll so that the active ingredient was 0.5 wt% with respect to the weight of the spunbonded nonwoven fabric.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 2 A spunbonded nonwoven fabric was prepared in the same manner as in Example 1 except that a propylene resin having a copolymerization rate of 5 mol% and a mesopentad fraction of 95% was used on the surface (A) and the surface (B). Obtained. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 1.
  • Example 3 A spunbonded nonwoven fabric was prepared in the same manner as in Example 1 except that a propylene resin having a copolymerization rate of 0 mol% and a mesopentad fraction of 88% was used on the surface (A) and the surface (B). Obtained. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 1.
  • Example 4 A spunbonded nonwoven fabric was prepared in the same manner as in Example 1 except that a propylene-based resin having an ethylene unit copolymerization rate of 3 mol% and a mesopentad fraction of 88% was used on the surface (A) and the surface (B). Obtained. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 1.
  • Example 1 A spunbonded nonwoven fabric was prepared in the same manner as in Example 1 except that a propylene resin having a copolymerization rate of 0 mol% and a mesopentad fraction of 95% was used on the surface (A) and the surface (B). Obtained. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 1.
  • Example 5 A spunbonded non-woven fabric was obtained in the same manner as in Example 1 except that 1.2 wt% of ethylene bisstearic acid amide was added as a fatty acid amide compound to the propylene resin on the surface (A) and the surface (B). Table 2 shows the evaluation results of the obtained spunbonded nonwoven fabric.
  • Example 6 On the surface (A), a spunbonded nonwoven fabric was obtained by the same method as in Example 1 except that a rectangular base having Y holes was used at the time of producing the fiber web and the cross section of the fiber was a triangular cross section. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 2.
  • Example 2 Same as Example 1 except that the surface (B) was towed and stretched at a spinning speed of 3700 m / min by compressed air having a single-hole discharge rate of 0.3 g / min and an ejector pressure of 0.08 MPa.
  • a spunbonded nonwoven fabric was obtained by the above method.
  • the evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 2.
  • Example 7 In the spunbonded nonwoven fabric, the same as in Example 1 except that a nonionic surfactant as a hydrophilic agent was applied to the nonwoven fabric using kissroll so that the active ingredient was 0.1 wt% with respect to the weight of the spunbonded nonwoven fabric. A spunbonded nonwoven fabric was obtained by the above method. The evaluation results of the obtained spunbonded nonwoven fabric are also shown in Table 2.
  • the spunbonded nonwoven fabrics obtained in Examples 1 to 7 have a large Db / Da and a moderately small amount of heat for crystal melting, they have excellent water absorption and quick-drying properties and flexibility on the surface (B). I understand.
  • the spunbonded nonwoven fabric obtained in Comparative Example 1 is inferior in flexibility due to the large amount of heat of crystal melting, and the spunbonded nonwoven fabric obtained in Comparative Example 2 has a small Db / Da, so that moisture is present on the surface (A). It can be seen that the surface (B) is inferior in water absorption and quick-drying property without being transferred to.
  • C 1 Cross-section contour L 11 : Straight lines passing through two points (S 11 , S 12 ) on the cross-section contour (C 1 ) in the fiber cross section S 11 and S 12 : Cross-section contour in the fiber cross section (C 1 )
  • Upper point C 2 Cross-section contour L 21 : Straight line passing through two points (S 21 , S 22 ) on the cross-sectional contour (C 2 ) in the fiber cross section L 22 : Parallel to the straight line (L 21 ) and , Lines S 21 , S 22 , V 21 with only one intersection (V 21 ) between points S 21 and 22 of the contour (C 2 ): points on the contour (C 2 ) of the cross section in the fiber cross section.
  • a Distance between points S 21 and S 22
  • b Distance between a straight line (L 21 ) and a straight line (L 22 )

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