WO2023112995A1 - Non-tissé, matériau sanitaire, et procédé de fabrication de non-tissé - Google Patents

Non-tissé, matériau sanitaire, et procédé de fabrication de non-tissé Download PDF

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WO2023112995A1
WO2023112995A1 PCT/JP2022/046281 JP2022046281W WO2023112995A1 WO 2023112995 A1 WO2023112995 A1 WO 2023112995A1 JP 2022046281 W JP2022046281 W JP 2022046281W WO 2023112995 A1 WO2023112995 A1 WO 2023112995A1
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nonwoven fabric
cooling air
propylene
thermoplastic resin
ratio
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PCT/JP2022/046281
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English (en)
Japanese (ja)
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正昭 大土井
康三 飯場
洋平 中西
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三井化学株式会社
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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
    • D04H3/007—Addition polymers

Definitions

  • the present disclosure relates to nonwoven fabrics, sanitary materials, and methods of manufacturing nonwoven fabrics.
  • nonwoven fabrics made of fibers containing thermoplastic resins have been widely used for various purposes due to their superior breathability, flexibility, and lightness.
  • the meltblowing method and the spunbond method which are suitable for mass production, are widely used.
  • nonwoven fabrics manufactured by the spunbond method have excellent properties such as mechanical properties such as tensile strength, bending resistance and air permeability, as well as continuous spinnability and productivity. It is used in many fields due to its excellent
  • Thermoplastic resins used for spunbond nonwoven fabrics and the like include polyamide resins, polyester resins and polyolefin resins from the viewpoint of melt spinnability and fiber properties. Particularly in absorbent articles, polyolefin-based resins, which are inexpensive and excellent in workability, are often used.
  • a spunbond nonwoven fabric composed of fibers made of a polyolefin resin has an average single fiber diameter of 6.5 to 11.9 ⁇ m and a fiber dispersion degree of 10 or less by reflected light luminance. and has a KES surface roughness SMD of 1.0 to 2.6 ⁇ m on at least one side.
  • Patent Document 1 International Publication No. 2019/167851
  • the nonwoven fabric described in Patent Document 1 has room for improvement in terms of achieving both tensile strength and fine fiberization of the nonwoven fabric.
  • the present disclosure has been made in view of the above, and aims to provide a nonwoven fabric having excellent tensile strength and a small fiber diameter, a sanitary material containing this nonwoven fabric, and a method for producing a nonwoven fabric capable of producing this nonwoven fabric. do.
  • Means for solving the above problems include the following embodiments. ⁇ 1> Including fibers, A nonwoven fabric, wherein the child lamella ratio in the fiber is 0.10 or less. ⁇ 2> The nonwoven fabric according to ⁇ 1>, wherein the child lamella ratio is 0.09 or less. ⁇ 3> The nonwoven fabric according to ⁇ 1> or ⁇ 2>, wherein the fiber has a fineness of 0.8 d or less. ⁇ 4> The nonwoven fabric according to ⁇ 3>, wherein the fiber has a fineness of 0.6 d or less. ⁇ 5> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 4>, wherein the fibers contain a thermoplastic resin.
  • thermoplastic resin contains a propylene homopolymer.
  • propylene homopolymer has a melt flow rate (MFR) of 10 g/10 minutes to 100 g/10 minutes.
  • MFR melt flow rate
  • ⁇ 8> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>, which is a spunbond nonwoven fabric.
  • ⁇ 9> A sanitary material comprising the nonwoven fabric according to any one of ⁇ 1> to ⁇ 8>.
  • thermoplastic resin or a resin composition containing the thermoplastic resin is discharged from a nozzle, and a cooling air is supplied to filaments of the discharged thermoplastic resin or the resin composition to melt-spun the filaments.
  • the thermoplastic resin has a mesophase ratio of 22% or more
  • a method for producing a nonwoven fabric wherein the ratio of the cooling air volume per 1 m width (m 3 /h/m) to the discharge volume per nozzle hole (g/min) is 10,000 to 40,000.
  • the ratio of the cooling air volume per 1 m width (m 3 /h/m) to the discharge volume per nozzle hole (g/min) is 15,000 to 40,000.
  • the ratio of the cooling air volume per 1 m width (m 3 /h/m) to the discharge volume per nozzle hole (g/min) is 30,000 to 40,000.
  • the cooling air has a temperature of 15°C to 30°C.
  • nonwoven fabric having excellent tensile strength and a small fiber diameter, a sanitary material containing this nonwoven fabric, and a method for producing a nonwoven fabric capable of producing this nonwoven fabric.
  • FIG. 1 is a schematic diagram of a spunbond nonwoven fabric manufacturing apparatus in one embodiment of the present disclosure
  • a numerical range indicated using “to” indicates a range including the numerical values before and after "to” as the minimum and maximum values, respectively.
  • upper or lower limits described in a certain numerical range may be replaced with upper or lower limits of other numerical ranges described step by step.
  • the upper limit value or lower limit value described in a certain numerical range may be replaced with values shown in examples such as experimental examples.
  • the amount of each component of the resin composition, etc. is the amount of the plurality of substances contained in the resin composition, etc., unless otherwise specified. means total volume.
  • non-woven fabric means entangled rather than woven fibers.
  • the terms "including as a subject” and “having as a subject” mean that the target substance is included in the largest amount relative to the whole. For example, it indicates that the content ratio of the target substance is 50% by mass or more as a percentage of the whole. In the present disclosure, a combination of two or more preferred aspects is a more preferred aspect.
  • the nonwoven fabric of the present disclosure comprises fibers, and the child lamellae ratio in said fibers is 0.10 or less, or 0.09 or less. As a result, a nonwoven fabric having excellent tensile strength and a small fiber diameter can be obtained. The reason for this is not clear, but is presumed as follows.
  • the child lamella ratio in the fiber means the ratio of the child lamella to the total of the parent lamella oriented in the fiber axis direction and the child lamella newly epitaxially grown on the parent lamella.
  • a small child lamella ratio means that the growth of the child lamella is suppressed. Since the growth of child lamellas is suppressed, the fiber strength, especially the fiber strength in the stretching direction during production, is excellent. Due to the excellent fiber strength, it is possible to suppress yarn breakage even when the pulling force of the fiber is increased during the production of the nonwoven fabric, and the fiber diameter can be reduced.
  • the child lamella ratio in the fiber can be adjusted, for example, by adjusting the physical properties, composition, etc. of the raw material of the fiber (e.g., thermoplastic resin, resin composition containing thermoplastic resin), or by adjusting the manufacturing conditions of the nonwoven fabric (e.g., from the raw material nozzle can be adjusted within a specific range by adjusting the discharge amount of the fiber, the cooling condition of the fiber, etc.).
  • the raw material of the fiber e.g., thermoplastic resin, resin composition containing thermoplastic resin
  • the manufacturing conditions of the nonwoven fabric e.g., from the raw material nozzle can be adjusted within a specific range by adjusting the discharge amount of the fiber, the cooling condition of the fiber, etc.
  • the physical properties of the raw material for example, by adjusting the mesophase ratio of the thermoplastic resin, it is possible to suitably adjust the child lamella ratio in the fiber.
  • the mesophase ratio can be suitably adjusted, for example, by adjusting the molecular weight distribution, stereoregularity, amount of low-molecular-weight components, etc. of the thermoplastic resin.
  • adjusting the balance between the amount of raw material discharged from the nozzle and the amount of cooling air For nonwoven fabric manufacturing conditions, for example, adjusting the balance between the amount of raw material discharged from the nozzle and the amount of cooling air. By adjusting the above balance, an increase in the crystallization rate of the raw material in the cooling step can be suppressed, the growth of child lamellae can be suppressed, and the child lamellae ratio in the fiber can be adjusted favorably.
  • the child lamella ratio in the fiber is 0.10 or less or 0.09 or less, preferably 0.08 or less, and preferably 0.07 or less from the viewpoint of the tensile strength of the nonwoven fabric.
  • the fiber strength is excellent, so it is possible to suppress yarn breakage even if the pulling force of the fiber is increased during the production of the nonwoven fabric, and the nonwoven fabric has a small fiber diameter.
  • the child lamella ratio in the fiber is 0.09 or less, the fiber strength is further increased, and the nonwoven fabric having a smaller fiber diameter while suppressing yarn breakage can be obtained.
  • the lower limit of the child lamella ratio in the fiber is not particularly limited, and may be, for example, 0.005 or more, or 0.01 or more.
  • the child lamella ratio in the fiber can be obtained as follows using a synchrotron radiation facility.
  • X-rays with a wavelength of 0.11 nm are focused so that the full width at half maximum of the irradiation diameter on the sample is approximately 1 ⁇ m.
  • a wide-angle X-ray diffraction measurement is performed with an exposure time of 10 seconds at each point while scanning at a pitch of 1 ⁇ m in the direction orthogonal to the fiber axis of the fiber to be measured.
  • the detector resolution, detection range, and camera length are not particularly limited as long as the object can be observed.
  • a charge integration type SOI two-dimensional detector SOPHIAS
  • SOPHIAS charge integration type SOI two-dimensional detector
  • C is the ion chamber value and subscripts 1 and 2 are the sample and blank data.
  • C is the ion chamber value and subscripts 1 and 2 are sample and blank data.
  • Formulas (1) and (2) are described in more detail below.
  • I Intensity (arb.u.)
  • C 1 value of upstream ion chamber
  • C 2 value of downstream ion chamber sample: data of sample to be measured
  • eb electrical background (dark data)
  • air air data
  • the diffraction peak intensity from the (110) plane of the ⁇ crystal is plotted against the azimuth angle ⁇ .
  • the intensities of the parent lamella and child lamella obtained by peak fitting with a Gaussian function in the range where q is 8 nm ⁇ 1 to 11 nm ⁇ 1 are defined as I m and I d , respectively, and r d defined by the following formula (3) is the child Lamellar ratio.
  • r d I d /(I m +I d ) (3)
  • the fibers contained in the nonwoven fabric of the present disclosure preferably contain a thermoplastic resin.
  • the fibers containing a thermoplastic resin may be fibers formed from a thermoplastic resin or a resin composition containing a thermoplastic resin.
  • the mesophase ratio of the thermoplastic resin is preferably 22% or more, more preferably 24% or more.
  • a thermoplastic resin having a mesophase ratio of 22% or more it becomes easier to obtain a nonwoven fabric having a small child lamella ratio in the fiber, for example, a nonwoven fabric having a ratio of 0.10 or less or 0.09 or less.
  • the upper limit of the mesophase ratio of the thermoplastic resin is not particularly limited, and may be, for example, 30% or less, or 29% or less.
  • the mesophase ratio of the thermoplastic resin can be measured by the method described in Examples below.
  • the molecular weight distribution (Mw/Mn) of the thermoplastic resin may be 3.0 to 5.5, or 3.5 to 5.0. may be 3.8 to 4.8, or 4.0 to 4.5.
  • the molecular weight distribution, mass average molecular weight and number average molecular weight, which will be described later, can be obtained by gel permeation chromatography (GPC) on the basis of monodisperse polystyrene.
  • GPC gel permeation chromatography
  • the mass average molecular weight (Mw) of the thermoplastic resin may be from 100,000 to 500,000, from 120,000 to 300,000, or from 130,000 to 200,000. , 140,000 to 155,000.
  • the number average molecular weight (Mn) of the thermoplastic resin may be from 20,000 to 100,000, from 25,000 to 80,000, or from 30,000 to 50,000. , 30,000 to 40,000.
  • stereoregularity of the thermoplastic resin is preferably 90.0 mol% to 94.5 mol%, more preferably 91.0 mol% to 94.0 mol%, from the viewpoint of suitably adjusting the mesophase ratio of the thermoplastic resin. %, more preferably 92.0 mol % to 94.0 mol %.
  • stereoregularity means mesopentad fraction [mmmm], and mesopentad fraction [mmmm] can be measured by the method described in Examples below.
  • thermoplastic resin is not particularly limited, and examples thereof include olefin-based polymers, polyester-based polymers, and polyamide-based polymers.
  • the thermoplastic resin may consist of one type, or may be a mixture of two or more types.
  • An olefin polymer is a polymer mainly containing structural units derived from an olefin
  • a polyester polymer is a polymer mainly containing a structural unit containing an ester bond
  • a polyamide polymer contains an amide bond. It is a polymer mainly containing structural units containing
  • olefin polymers include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 3-methyl-1-butene, 3-methyl-1-pentene, Examples include homopolymers and copolymers of ⁇ -olefins such as 3-ethyl-1-pentene, 4-methyl-1-pentene and 4-methyl-1-hexene.
  • polyester polymers include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate.
  • polyamide-based polymers include nylon-6, nylon-66, and poly-meta-xylene adipamide.
  • the thermoplastic resin preferably contains an olefin polymer, more preferably mainly containing an olefin polymer.
  • the olefin-based polymer preferably contains at least one selected from the group consisting of propylene-based polymers and ethylene-based polymers.
  • the olefin polymer may be an ⁇ -olefin homopolymer or a copolymer of two or more ⁇ -olefins.
  • the content of the olefin polymer contained in the thermoplastic resin may be 60% by mass or more, 80% by mass or more, or 100% by mass with respect to the total amount of the thermoplastic resin. good.
  • content of olefin polymer contained in thermoplastic resin “content of propylene polymer contained in thermoplastic resin” or “content of ethylene polymer contained in thermoplastic resin” You can read it differently.
  • a propylene-based polymer is a polymer mainly containing structural units derived from propylene, and includes propylene homopolymers and copolymers of propylene and ⁇ -olefins other than propylene (propylene/ ⁇ -olefin copolymers). It is a concept. For example, it may be either a propylene homopolymer or a copolymer of propylene and an ⁇ -olefin other than propylene, or may contain both.
  • the propylene/ ⁇ -olefin copolymer is, for example, preferably a copolymer of propylene and one or more ⁇ -olefins having 2 to 10 carbon atoms other than propylene. Copolymers with one or two or more ⁇ -olefins of 2 to 8 are more preferred.
  • preferred ⁇ -olefins to be copolymerized with propylene from the viewpoint of excellent flexibility include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 3-methyl-1- butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene and the like.
  • propylene/ ⁇ -olefin copolymers examples include propylene/ethylene copolymers and propylene/ethylene/1-butene copolymers.
  • the content of structural units derived from the ⁇ -olefin in the propylene/ ⁇ -olefin copolymer is not particularly limited, and is preferably, for example, 1 mol% to 10 mol%, and 1 mol% to 5 mol%. is more preferable.
  • the propylene-based polymer may be one propylene-based polymer or a combination of two or more propylene-based polymers.
  • a copolymer of propylene and an ⁇ -olefin other than propylene when the content of propylene-derived structural units and the content of ethylene-derived structural units are equal, such a copolymer is propylene It is classified as a system polymer.
  • Propylene-based polymers such as propylene homopolymers and propylene/ ⁇ -olefin copolymers may be biomass-derived propylene-based polymers.
  • biomass-derived propylene-based polymer means a propylene-based polymer produced from raw material monomers containing biomass-derived propylene.
  • Monomers containing biomass-derived propylene which is the raw material for biomass-derived propylene-based polymers, can be obtained by cracking biomass naphtha or synthesizing from biomass-derived ethylene.
  • the biomass-derived propylene-based polymer is obtained by polymerizing the thus-synthesized biomass-derived propylene-containing monomer by the same method as in the case of using conventionally known petroleum-derived propylene.
  • a propylene-based polymer synthesized using a bio-derived propylene-containing monomer as a raw material is a biomass-derived propylene-based polymer.
  • the content of the bio-derived propylene-based polymer in the raw material monomers is more than 0% by mass, may be 100% by mass, or may be less than 100% by mass with respect to the total amount of the raw material monomers.
  • Monomers that are raw materials for biomass-derived propylene-based polymers include bio-derived propylene, propylene derived from fossil fuels such as petroleum, and/or ⁇ -olefins other than ethylene and propylene (1-butene, 1-hexene, etc.). may further include
  • the biomass-derived propylene-based polymer is made from methanol using gas generated by thermal decomposition of empty fruit bunches (EFB: Empty Fruit Bunches) such as coconut shells (MTO: Methanol-to-Olefins) or methanol It can also be obtained by polymerizing propylene obtained by synthesizing propylene (MTP: Methaneol-to-propylene) from The biomass-derived propylene-based polymer can also be obtained by polymerizing propylene obtained by dehydrating isopropanol produced by fermentation of biomass raw materials mainly composed of non-edible plants such as sorghum.
  • EFB Empty Fruit Bunches
  • MTO Methanol-to-Olefins
  • MTP Methaneol-to-propylene
  • the biomass-derived carbon content Pbio (%) in the raw material can be calculated by the following formula.
  • Formula (2): Pbio (%) PC14/105.5 x 100 That is, if all the raw materials for the propylene-based polymer are derived from biomass, the content of biomass-derived carbon is theoretically 100%. Therefore, the biomass degree of the biomass-derived propylene-based polymer is 100%. Since fossil fuel-derived raw materials hardly contain C14, the content of biomass-derived carbon in the propylene-based polymer produced only from fossil fuel-derived raw materials is 0%, and the fossil fuel-derived propylene-based polymer has a content of 0%. The biomass degree of coalescence is 0%.
  • Biomass degree indicates the content of biomass-derived carbon, and is calculated by measuring radioactive carbon (C14). Carbon dioxide in the atmosphere contains a certain proportion of C14 (approximately 105.5 pMC). Therefore, it is known that the C14 content in plants (for example, corn) that grow by taking in carbon dioxide from the atmosphere is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, the content of biomass-derived carbon in the raw material can be calculated by measuring the ratio of C14 contained in all carbon atoms in the propylene-based polymer.
  • the biomass degree of the propylene-based polymer that can be used as a raw material for the nonwoven fabric of the present disclosure is preferably 10% or more.
  • the content of the biomass-derived propylene polymer that can be used in the nonwoven fabric of the present disclosure is 5% by mass to 99% by mass, 10% by mass to It can be 75% by weight, or 20% to 50% by weight.
  • the propylene-based polymer that can be used as a raw material for the nonwoven fabric of the present disclosure may include a propylene-based polymer obtained by recycling, a so-called recycled polymer.
  • "Recycled polymer” includes polymers obtained by recycling waste polymer products, and can be produced, for example, by the method described in DE102019127827 (A1).
  • the recycled polymer may contain a marker that allows it to be identified as having been obtained by recycling.
  • Ethylene-based polymers are polymers mainly composed of structural units derived from ethylene, and include ethylene homopolymers and copolymers of ethylene and ⁇ -olefins other than ethylene (ethylene/ ⁇ -olefin copolymers). It is a concept. For example, it may be either an ethylene homopolymer or a copolymer of ethylene and an ⁇ -olefin other than ethylene, or may contain both.
  • the ethylene/ ⁇ -olefin copolymer is preferably, for example, a copolymer of ethylene and one or more ⁇ -olefins having 2 to 10 carbon atoms other than ethylene.
  • preferred ⁇ -olefins to be copolymerized with ethylene from the viewpoint of excellent flexibility include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 3-methyl-1- butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene and the like.
  • Examples of ethylene/ ⁇ -olefin copolymers include ethylene/propylene copolymers and ethylene/1-butene copolymers.
  • the content of structural units derived from ⁇ -olefin in the ethylene/ ⁇ -olefin copolymer is not particularly limited, and is preferably, for example, 1 mol% to 10 mol%, and 1 mol% to 5 mol%. is more preferable.
  • the ethylene-based polymer may be one type of ethylene-based polymer, or may be a combination of two or more types of ethylene-based polymers.
  • the thermoplastic resin preferably contains a propylene-based polymer, and more preferably contains a propylene homopolymer.
  • the content of the propylene homopolymer contained in the thermoplastic resin may be 60% by mass or more, or 80% by mass or more, relative to the total amount of the thermoplastic resin. There may be, and 100 mass % may be sufficient.
  • the melting point of the thermoplastic resin (preferably the melting point of the olefin-based polymer, more preferably the melting point of the propylene-based polymer) is not particularly limited. It may be 150° C. or higher.
  • the upper limit of the melting point of the thermoplastic resin is not particularly limited, and may be 165° C. or lower, for example.
  • melting points can be measured using differential scanning calorimetry (DSC) as follows. Using DSC Pyris1 manufactured by PerkinElmer or DSC7020 manufactured by SII Nanotechnology as a differential scanning calorimeter (DSC), under a nitrogen atmosphere (20 ml / min), a sample (about 5 mg) was set for each thermoplastic resin. After raising the temperature to the attained temperature (230° C. in the case of a propylene-based polymer) and maintaining that temperature for 3 minutes, the temperature was cooled to 30° C. at 10° C./min and maintained at 30° C. for 1 minute, followed by 10° C./min. and the melting point (Tm) is calculated from the apex of the crystal melting peak during the heating process. When multiple crystal melting peaks are observed, the peak on the high temperature side is taken as the melting point (Tm).
  • DSC differential scanning calorimetry
  • Tm melting point
  • Tm melting point
  • the melt flow rate (MFR) (ASTM D-1238, 230°C, load 2160g) of the propylene-based polymer (preferably propylene homopolymer) is not particularly limited as long as the nonwoven fabric can be produced.
  • the MFR of the propylene-based polymer (preferably propylene homopolymer) is preferably 10 g/10 min to 100 g/10 min, more preferably 15 g/10 min to 60 g, from the viewpoint of reducing the fineness while maintaining the strength of the nonwoven fabric. /10 min, more preferably 20 g/10 min to 50 g/10 min.
  • the density of the propylene-based polymer (preferably propylene homopolymer) is not particularly limited as long as it can be melt-spun, and may be 0.900 g/cm 3 to 0.945 g/cm 3 , 0.910 g/cm 3 to 0.940 g/cm 3 .
  • the density of the propylene-based polymer can be measured according to JIS K7112 (density gradient tube method).
  • a propylene-based polymer (preferably a propylene homopolymer) is obtained by polymerizing raw material propylene using a known catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst. Among them, it is preferable to use a Ziegler-Natta catalyst in order to eliminate heterogeneous bonds, and to use a catalyst capable of polymerizing with high stereoregularity. As a method for polymerizing propylene, known methods may be adopted.
  • a method of polymerizing in an inert solvent such as hexane, heptane, toluene, or xylene a method of polymerizing in a liquid monomer, a method of polymerizing a gaseous monomer with a catalyst is added and polymerized in a gas phase state, or a method of polymerizing by combining these.
  • the nonwoven fabric of the present disclosure contains commonly used antioxidants, weather stabilizers, light stabilizers, antistatic agents, slip agents, hydrophilic agents, antifogging agents, antiblocking agents, lubricants, Additives such as nucleating agents, dyes, pigments, natural oils, synthetic oils, waxes, and amide compounds may be included.
  • a resin composition may be used in which one or more additives described above are added to a thermoplastic resin, if necessary.
  • the content of the thermoplastic resin contained in the fibers may be 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass with respect to the total amount of fibers. % or more, 90% by mass or more, or 95% by mass or more.
  • the content of the thermoplastic resin contained in the fibers may be 100% by mass or less, 99.5% by mass or less, or 99% by mass or less.
  • the content of the additive contained in the fiber may be 0.1% by mass to 50% by mass with respect to the total amount of the fiber. , 0.5% to 20% by weight, 0.5% to 10% by weight, or 1% to 5% by weight.
  • the nonwoven fabric of the present disclosure may contain an amide compound.
  • Amide compounds can function as lubricants.
  • amide compounds include fatty acid amides, such as fatty acid amides having 15 to 22 carbon atoms. By adsorbing fatty acid amides with 15 to 22 carbon atoms on the fiber surface of the non-woven fabric, the fiber surface is modified and the flexibility, touch, blocking resistance, etc. are further improved. It is thought that adhesion of fibers to members such as various rotating devices is more effectively suppressed.
  • the number of carbon atoms in the fatty acid amide in the present disclosure means the number of carbon atoms contained in the molecule, and the carbon atoms constituting the amide bond are also included in the number of carbon atoms.
  • the number of carbon atoms in the fatty acid amide may be 18-22.
  • Fatty acid amides include fatty acid monoamide compounds, fatty acid diamide compounds, saturated fatty acid monoamide compounds, and unsaturated fatty acid diamide compounds. Specific examples include palmitamide (16 carbon atoms), stearamide (18 carbon atoms), oleamide (18 carbon atoms), and erucamide (22 carbon atoms).
  • the content of the amide compound is preferably 0.1% by mass to 5.0% by mass, more preferably 0.1% by mass to 3.0% by mass, based on the total amount of the nonwoven fabric. % by mass is more preferable, and 0.1% by mass to 1.0% by mass is even more preferable. Only one kind of amide compound may be contained in the nonwoven fabric, or two or more kinds thereof may be contained.
  • the fineness of the fibers contained in the nonwoven fabric may be 1.4 d (denier) or less, 1.3 d or less, or 1.0 d or less.
  • the fineness of the fibers contained in the nonwoven fabric is preferably 0.8 d or less, more preferably 0.6 d or less, more preferably 0.5 d, from the viewpoint of high strength, low air permeability, high water resistance, good touch feeling, etc. More preferably:
  • the lower limit of the fiber fineness is not particularly limited, and may be, for example, 0.05 d or more.
  • the basis weight of the nonwoven fabric is not particularly limited, and from the viewpoint of obtaining a nonwoven fabric having mechanical strength suitable for practical use and moderate flexibility, it is preferably 5 g/m 2 to 100 g/m 2 , and preferably 7 g/m 2 . More preferably ⁇ 50 g/m 2 .
  • the basis weight of the nonwoven fabric may be read as "the basis weight of the nonwoven fabric laminate".
  • nonwoven fabrics are not particularly limited, and include spunbond nonwoven fabrics, meltblown nonwoven fabrics, carded air-through nonwoven fabrics, air-laid nonwoven fabrics, needle-punched spunbond nonwoven fabrics, wet nonwoven fabrics, dry pulp nonwoven fabrics, flash spun nonwoven fabrics, open fiber nonwoven fabrics, and the like. be done.
  • Nonwovens of the present disclosure preferably comprise spunbond nonwovens.
  • a spunbonded nonwoven fabric has a smaller fiber diameter and is denser and more uniform than other nonwoven fabrics with the same basis weight. Therefore, spunbond nonwoven fabrics are suitably used for applications requiring performance such as low air permeability and high water resistance.
  • the nonwoven fabric of the present disclosure may consist of one type of nonwoven fabric, or may consist of two or more types of nonwoven fabrics.
  • the fibers included in the nonwoven fabrics of the present disclosure may be either solid or hollow fibers.
  • the nonwoven fabric of the present disclosure is preferably a nonwoven fabric composed of solid fibers. Methods described in known literatures may be appropriately referred to as methods for producing hollow fibers.
  • the form of the fibers contained in the nonwoven fabric of the present disclosure is not particularly limited, and may be conjugate fibers or monocomponent fibers.
  • the conjugate fiber preferably contains two or more thermoplastic resins as constituents. Examples of composite fibers include core-sheath type, side-by-side type, and sea-island type composite fibers.
  • the core-sheath type conjugate fiber may be either a concentric core-sheath type or an eccentric core-sheath type as long as it has a core portion and a sheath portion.
  • the core of the eccentric core-sheath type conjugate fiber may or may not be exposed on the surface.
  • the fibers contained in the nonwoven fabric of the present disclosure may be crimped fibers or non-crimped fibers.
  • the non-crimped fibers may be, for example, eccentric core-sheath type crimped conjugate fibers.
  • the nonwoven fabric of the present disclosure may be a nonwoven fabric consisting of one layer, or may be a nonwoven fabric laminate consisting of two or more layers of nonwoven fabric. It may be a nonwoven fabric laminate containing.
  • the layer other than the nonwoven fabric of the present disclosure may be one layer, or may be two or more layers.
  • Layers other than the nonwoven fabric of the present disclosure include knitted fabrics, woven fabrics, nonwoven fabrics other than the nonwoven fabric of the present disclosure (hereinafter also referred to as "other nonwoven fabrics"), films, and the like.
  • Other nonwovens include the various nonwovens described above.
  • the method for forming the nonwoven fabric laminate is not particularly limited, and may be heat embossing, heat fusion such as ultrasonic fusion, mechanical interlacing such as needle punch or water jet, hot melt adhesive, or urethane adhesive.
  • heat embossing heat fusion
  • mechanical interlacing such as needle punch or water jet
  • hot melt adhesive hot melt adhesive
  • urethane adhesive urethane adhesive
  • nonwoven fabric of the present disclosure or a nonwoven fabric laminate containing the nonwoven fabric of the present disclosure is preferably pressure-bonded (preferably heat-sealed) in part.
  • nonwoven fabric, etc. a nonwoven fabric laminate containing the nonwoven fabric of the present disclosure
  • crimping method for crimping a part of the nonwoven fabric include a method using means such as ultrasonic waves, heat embossing using an embossing roll, hot air through, and the like.
  • the nonwoven fabric or the like may have a crimped portion and a non-crimped portion.
  • the area ratio of the crimped portion is preferably 5% to 30%, more preferably 5% to 20%, even more preferably 8% to 14%. As a result, the balance between softness and strength of the nonwoven fabric can be improved.
  • the area ratio of the crimped portion was obtained by taking a test piece of 10 mm ⁇ 10 mm from the nonwoven fabric, observing the contact surface of the test piece with the embossing roll with an electron microscope (magnification: 100 times), and observing the area of the nonwoven fabric. to the ratio of the area of the crimped portion.
  • the area ratio of the protrusions formed on the embossing roll that can form the crimping portion is also called "embossed area ratio".
  • the preferred range of the embossed area ratio is the same as the above-mentioned preferred range of the area ratio of the crimped portion.
  • Examples of the shape of the crimping part include circle, ellipse, oval, square, rhombus, rectangle, square, and continuous shapes based on these shapes.
  • nonwoven fabric of the present disclosure is not particularly limited, and it can be widely used for applications in which nonwoven fabrics are normally used.
  • Applications of non-woven fabrics include, for example, filters, sanitary materials, medical materials, packaging materials (oxygen absorbers, body warmers, warm packages, food packaging materials, etc.), battery separators, heat insulating materials, heat insulating materials, protective clothing, and clothing materials. , electronic materials, sound absorbing materials, and the like.
  • Nonwoven fabrics are particularly suitable for use as sanitary materials.
  • the sanitary material of the present disclosure includes the nonwoven fabric of the present disclosure described above.
  • sanitary materials include absorbent articles such as disposable diapers, disposable pants, sanitary products, urine absorbing pads, and pet sheets; medical sanitary materials such as bandages, medical gauze, towels, sheets, poultice materials; A mask, a sanitary mask, etc. are mentioned.
  • the sanitary material of the present disclosure is not limited to these, and can be suitably used for other sanitary material applications.
  • the sanitary material may include a nonwoven fabric laminate composed of two or more layers of the nonwoven fabric of the present disclosure, or may include a nonwoven fabric laminate including the nonwoven fabric of the present disclosure and other layers other than the nonwoven fabric of the present disclosure. good.
  • thermoplastic resin or a resin composition containing the thermoplastic resin is discharged from a nozzle, and a cooling air is supplied to the discharged thermoplastic resin or the resin composition to perform melt spinning.
  • a method for producing a nonwoven fabric The thermoplastic resin used in the nonwoven fabric manufacturing method has a mesophase ratio of 22% or more, and the manufacturing conditions for the nonwoven fabric are the amount of cooling air per meter of width (m 3 /h/ The ratio of m) is between 10,000 and 40,000 or between 15,000 and 40,000.
  • thermoplastic resin or a resin composition containing a thermoplastic resin as described above By using a thermoplastic resin or a resin composition containing a thermoplastic resin as described above and producing a nonwoven fabric under the conditions described above, a nonwoven fabric having excellent tensile strength and a small fiber diameter can be produced. Furthermore, this production method is excellent in spinning stability, and tends to suppress yarn breakage during melt spinning.
  • thermoplastic resin or resin composition used in the nonwoven fabric manufacturing method of the present disclosure are the same as the preferred conditions for the thermoplastic resin or resin composition described above in the nonwoven fabric section of the present disclosure.
  • the nonwoven fabric obtained by the nonwoven fabric manufacturing method of the present disclosure is not particularly limited, and includes the nonwoven fabrics exemplified above. Among them, the nonwoven fabric obtained by the method for producing a nonwoven fabric of the present disclosure is preferably a spunbond nonwoven fabric.
  • thermoplastic resin or the resin composition containing the thermoplastic resin may be melt-kneaded in an extruder, and the molten thermoplastic resin or resin composition may be discharged from a nozzle.
  • a filament of the thermoplastic resin or the resin composition is obtained by discharging the molten thermoplastic resin or the resin composition from the nozzle.
  • the melting temperature of the thermoplastic resin or resin composition is not particularly limited, and may be appropriately adjusted depending on the type of thermoplastic resin. good too.
  • a molten thermoplastic resin or resin composition may be discharged into the cooling section from a plurality of nozzles.
  • the discharge rate per nozzle hole (fr) may be 0.60 g/min or less, or may be 0.55 g/min or less.
  • the discharge rate (fr) per nozzle hole is preferably 0.40 g/min or less, more preferably 0.35 g/min or less, from the viewpoint of maintaining spinning stability and obtaining thin fibers. , more preferably 0.30 g/min or less, particularly preferably 0.25 g/min or less, and most preferably 0.20 g/min or less.
  • the lower limit of the ejection amount (fr) per nozzle hole is not particularly limited, and may be, for example, 0.10 g/min or more, or 0.15 g/min.
  • the cooling air volume (fa) per 1 m width is 4,000 m 3 / from the viewpoint of maintaining spinning stability and obtaining fine fibers. h/m to 7,300 m 3 /h/m, preferably 4,500 m 3 /h/m to 7,000 m 3 /h/m, more preferably 5,000 m 3 /h/m It is more preferably from 7,000 m 3 /h/m, and particularly preferably from 5,500 m 3 /h/m to 7,000 m 3 /h/m.
  • the cooling air volume per 1 m width means the cooling air volume per 1 m width of means (cooling air supply unit) for supplying cooling air to the discharged filaments of thermoplastic resin or resin composition.
  • fa/fr which is the ratio of the cooling air volume per 1 m width (m 3 /h/m) to the discharge volume per nozzle hole (g/min), is 10,000 to 40,000 or 15,000 to 40,000. From the viewpoint of enabling fine fiberization while maintaining spinning stability, it is preferably 30,000 to 40,000, more preferably 31,000 to 39,000, and 34,000. More preferably ⁇ 39,000.
  • the fa/fr has an effect on the cooling rate of the filament. A large fa/fr tends to increase the cooling rate, and a small fa/fr tends to decrease the cooling rate.
  • thermoplastic resin having a mesophase ratio of 22% or more and setting fa/fr to be 40,000 or less an increase in crystallization rate due to an increase in cooling rate is suppressed. This tends to suppress the increase in the child lamella ratio by promoting the growth of the parent lamella while suppressing the growth of the child lamella in the fiber, and the excessive increase in the traction force of the filament is also suppressed, resulting in yarn breakage. can also be suppressed.
  • thermoplastic resin having a mesophase ratio of 22% or more and setting fa/fr to be 10,000 or more or 15,000 or more while maintaining spinning stability, insufficient pulling force of filaments is suppressed and fineness is achieved. Fiberization becomes possible. In particular, by setting fa/fr to 15,000 or more, a sufficient pulling force of the filament can be obtained, so that further fine fibrillation becomes possible.
  • the temperature of the cooling air is preferably 15° C. to 30° C., more preferably 20° C. to 30° C., more preferably 22° C. to 28° C., from the viewpoint of enabling fine fiber formation while maintaining spinning stability. °C is more preferred.
  • the cooling air When supplying the cooling air to the filaments, the cooling air may be supplied from the cooling air supply unit to the filaments of the thermoplastic resin or resin composition discharged into the cooling unit.
  • the cooling air supply unit may supply cooling air from a direction intersecting (preferably perpendicular to) the vertically downward direction to the filaments of the thermoplastic resin or resin composition discharged vertically downward.
  • the cooling air supply unit may be divided into a plurality of parts, for example, it may be divided into two or more stages in the vertical direction via a partition wall, or may be divided into two stages in the vertical direction via a partition wall. good.
  • the cooling air supplied by the divided cooling air supply units may have the same or different conditions such as temperature, air volume, and air velocity. Since the cooling air supply unit is divided into a plurality of parts, it is possible to adjust the temperature, air volume, air velocity, etc. of the cooling air in each of the divided cooling air supply parts, thereby facilitating the adjustment of the child lamella ratio. becomes.
  • the cooling air supply section may include a vertically upper first cooling air supply section and a vertically lower second cooling air supply section that are vertically divided into two stages via a partition wall.
  • the temperature of the cooling air supplied to the first cooling air supply unit is 10° C. to 40° C.
  • the temperature of the cooling air supplied to the second cooling air supply unit is It is preferable that the temperature is 10°C or more higher than the temperature of the cooling air supplied to the cooling air supplying section 1 and is 30°C to 70°C.
  • the average wind speed (V 2 ) of the cooling air supplied to the second cooling air supply unit is higher than the average wind speed (V 1 ) of the cooling air supplied to the first cooling air supply unit. is preferably large.
  • the ratio of V 1 to V 2 is preferably more than 0 and 0.8 or less, more than 0 and 0.7 or less more preferably, 0.01 ⁇ V 1 /V 2 ⁇ 0.5, and particularly preferably 0.05 ⁇ V 1 /V 2 ⁇ 0.4.
  • the ratio of the air volume of the cooling air supplied to the first cooling air supply unit to the air volume of the cooling air supplied to the second cooling air supply unit A certain upper and lower cooling air volume ratio (first cooling air supply unit: second cooling air supply unit) is preferably 1:1.2 to 1:5, and 1:1.5 to 1:4 is more preferred. From the viewpoint of more preferably suppressing thread breakage, the upper and lower cooling air volume ratio (first cooling air supply section:second cooling air supply section) may be 1:1 to 1:5.
  • the method for producing a nonwoven fabric of the present disclosure includes the steps of discharging a thermoplastic resin or resin composition from a nozzle, and supplying cooling air to the discharged thermoplastic resin or resin composition filaments to with cooling, drawing the cooled filaments, and collecting the drawn filaments to form a nonwoven web. Furthermore, the method of manufacturing the nonwoven fabric of the present disclosure may include the step of heat-pressing the nonwoven web.
  • the embossing temperature may be adjusted as appropriate according to the line speed, crimping pressure, etc. during embossing. good.
  • nonwoven fabric manufacturing method of the present disclosure will be described below with reference to FIG. In the following embodiments, a method for manufacturing a spunbond nonwoven fabric will be described. In addition, the manufacturing method of the nonwoven fabric of this indication is not limited to the following embodiment.
  • a spunbond nonwoven fabric is manufactured using, for example, the spunbond nonwoven fabric manufacturing apparatus 100 shown in FIG. A spunbond nonwoven fabric manufacturing apparatus 100 shown in FIG. a device 9;
  • the cooling air supply unit 4 is divided into two stages via a partition wall 11 having no air permeability.
  • thermoplastic resin or resin composition filaments 6 discharged from the plurality of nozzles of the spinneret 2 into the cooling chamber 3 are cooled by the cooling air supplied from the cooling air supply unit 4 into the cooling chamber 3 .
  • the cooling air supply section 4 is divided into two stages via a partition wall 11 having no air permeability, and the cooling air is supplied from the first cooling air supply section 4A and the second cooling air supply section 4B which are divided into two stages. It is supplied to the cooling chamber 3 .
  • Preferred conditions for the cooling air supplied from the first cooling air supply section 4A and the second cooling air supply section 4B are as described above.
  • the air-permeable partition wall 5 is not particularly limited as long as it is a partition wall having air permeability. It is more preferable to have a shape.
  • the thickness of the air-permeable partition wall 5 is preferably 10 mm to 50 mm, more preferably 20 mm to 40 mm, in terms of strength and rectification of cooling air.
  • the discharged thermoplastic resin or resin composition filaments 6 are cooled by the cooling air supplied from the cooling air supply unit 4 into the cooling chamber 3 .
  • the cooling air used for cooling is passed through a bottleneck (drawing portion) located downstream of the cooling chamber 3 for use as the drawing air, and the long fibers are drawn (pulled) by the drawing air. .
  • the drawn fibers are dispersed in a diffuser 7 located downstream of the bottleneck.
  • the dispersed fibers are sucked by the suction device 9 to deposit the nonwoven web 10 on the mesh belt 8 which is the moving collection surface.
  • the nonwoven web 10 may be heat and pressure treated with entanglements.
  • a spunbond nonwoven fabric is obtained by the above.
  • a gap is provided between the partition wall 11 and the air-permeable partition wall 5 in the spunbond nonwoven fabric manufacturing apparatus 100 .
  • the distance d of the gap may be 55 mm or less, 50 mm or less, 45 mm or less, or 40 mm or less from the viewpoint of more preferably suppressing thread breakage.
  • the distance d of the gap may be 5 mm or more, or may be 10 mm or more, from the point of suppressing yarn swinging more preferably. Note that the gap described above is not an essential configuration, and d may be 0 mm.
  • the width L of the cooling air supply section 4 is not particularly limited, and may be 3m to 7m or 4m to 6m. Also, the height h of the cooling air supply unit 4 is not particularly limited, and may be 0.4 m to 1.0 m, or may be 0.6 m to 0.8 m.
  • the width of the cooling air supply section 4 is L (m)
  • the height of the cooling air supply section 4 is h (m)
  • the distance of the gap is d (mm)
  • (L x h)/d is 0.0. 056 or higher is preferable.
  • the height h of the cooling air supply portion 4 corresponds to h 1 + h 2 + the thickness of the partition wall 11 in FIG. It is the inner length of the cooling air supply section 4 excluding the outer wall in the direction orthogonal to the height of the supply section 4 .
  • the width L of the cooling air supply portion 4 and the height h of the cooling air supply portion 4 mean the width and height of the cooling air outlet of the cooling air supply portion 4 . Therefore, (L ⁇ h) means the area of the surface through which the cooling air passes at the cooling air outlet of the cooling air supply unit 4, and (L ⁇ h)/d means the ratio of this area to the gap distance d. .
  • (L ⁇ h)/d may be 0.056 to 0.614, or may be 0.112 to 0.448.
  • (L ⁇ h)/d is 0.056 or more, yarn breakage can be more suitably suppressed, and when (L ⁇ h)/d is 0.614 or less, yarn swinging can be further reduced. It can be suitably suppressed.
  • the ratio (distance B/distance d) of the distance (distance B) from the nozzle surface to the partition wall 11 to the distance d of the gap may be 5-50.
  • the ratio of the height (h 2 ) of the second cooling air supply section 4B to the height (h 1 ) of the first cooling air supply section 4A may be 0.5 to 1.5, and may be 0.7 to 0.7. It may be 1.2.
  • the ratio of the thickness of the breathable partition to the distance d is preferably 0.5 to 5.0, more preferably 0.5 to 1.5. , 0.8 to 1.2.
  • the ratio (distance B/distance C) of the distance (distance B) from the nozzle surface to the partition wall 11 to the distance (distance C) from the nozzle surface to the entrance of the extending portion is preferably 0.2 to 0.8. , 0.2 to 0.6.
  • the mesophase ratio of the raw material resin was measured using FLASH DSC1 (manufactured by METTLER TOLEDO). After heating the pellets of the raw material resin from 0 ° C. to 200 ° C. at 100 ° C./sec, holding at 200 ° C. for 0.5 seconds, then cooling to 0 ° C. at 100 ° C./sec. was obtained, and the calorific value was measured. The ⁇ crystal-derived peak around 80° C. and the mesophase peak around 40° C. appearing in the cooling curve were fitted with a Gaussian function, and the peak integral values of the ⁇ crystal and mesophase were compared to obtain the mesophase ratio.
  • melt flow rate (MFR) of the starting resin was measured under conditions of 230° C. and a load of 2160 g.
  • the mesopentad fraction [mmmm] which is an index of stereoregularity, was determined as follows.
  • the mesopentad fraction [mmmm] is measured by the methyl group signal in the 13 C-NMR spectrum according to the method proposed by A. Zambelli et al. in "Macromolecules, 6, 925 (1973)". is the meso fraction in terms of pentad units in the polypropylene molecular chain.
  • Stereoregularity increases as the mesopentad fraction [mmmm] increases.
  • the 13C-NMR spectrum can be measured using the following apparatus and conditions according to the peak assignments proposed by A. Zambelli et al.
  • Fineness [d: number of grams of fiber per 9000 m]
  • Ten test pieces with a machine direction (MD) of 10 mm and a transverse direction (CD) of 10 mm (10 mm (MD) ⁇ 10 mm (CD)) were taken from the nonwoven fabric. The sample was taken at any place in the MD direction, and in the CD direction, 10 places were uniformly spaced on a straight line except for 20 cm at both ends of the nonwoven fabric.
  • Fiber diameters were read to one decimal place in microns using a Nikon ECLIPSE E400 microscope at 20x magnification. The diameter was measured at 20 arbitrary points for each test piece, and the diameter at a total of 200 points was measured. The number of grams of fiber per 9000 m was determined for each measuring point.
  • the density of the polypropylene-based polymer was calculated as 0.91 g/cm 3 .
  • the average number of grams of fiber per 9,000 m was obtained for each measurement point, and the average value was rounded off to the second decimal place to determine the fineness of the nonwoven fabric.
  • Child lamella ratio X-rays with a wavelength of 0.11 nm were collected at the beamline BL03XU dedicated to the frontier soft matter development industry-academia alliance in the large synchrotron radiation facility SPring-8 so that the full width at half maximum of the irradiation diameter on the sample was about 1 ⁇ m. shined.
  • a wide-angle X-ray diffraction measurement was performed with an exposure time of 10 seconds at each point while scanning at a pitch of 1 ⁇ m in the direction perpendicular to the fiber axis of the fiber to be measured.
  • a charge integrating SOI two-dimensional detector (SOPHIAS) with a pixel resolution of 30 ⁇ m ⁇ 30 ⁇ m and a detection range of 2160 ⁇ 891 pixels was installed with a camera length of 56.8 mm.
  • SOPHIAS SOI two-dimensional detector
  • the tensile load was measured according to JIS L 1906. First, 25 cm in the machine direction (MD) and 2.5 cm in the transverse direction (CD) from the nonwoven fabric in a temperature-controlled room with a temperature of 20 ⁇ 2 ° C and a humidity of 65 ⁇ 2% specified in JIS Z 8703 (standard conditions of the test place). 5 specimens were collected. A tensile test was performed on the obtained test piece using a tensile tester (Instron 5564 model manufactured by Instron Japan Company Limited) under the conditions of a chuck distance of 100 mm and a tensile speed of 300 mm/min.
  • a tensile tester Instron 5564 model manufactured by Instron Japan Company Limited
  • Strength INDEX per unit basis weight (((MD maximum intensity) 2 + (CD maximum intensity) 2 ))/2) 0.5 / basis weight
  • PP1 and PP2 propylene-based polymers
  • PP1 and PP2 were used as raw material resins.
  • PP1 and PP2 were produced according to the method described in International Publication No. 2019/065306 by adjusting synthesis conditions such as reaction temperature and reaction time.
  • PP1 Propylene homopolymer (A) (mesophase ratio 25%, MFR 35 g/10 min, melting point 160°C, stereoregularity 92.7 mol%, Mw 152,000, Mn 36,000, Mw/Mn 4.2)
  • PP2 Propylene homopolymer (B) (mesophase ratio 20%, MFR 35 g/10 min, melting point 161°C, stereoregularity 94.9 mol%, Mw 157,000, Mn 42,000, Mw/Mn 3.7)
  • Example 1 A spunbond nonwoven fabric was manufactured by a spunbond method using a spunbond nonwoven fabric manufacturing apparatus equipped with one extruder shown in FIG. A nozzle for monocomponent fibers was used as the nozzle.
  • Propylene homopolymer (A) was melted at a molding temperature of 240° C. by an extruder.
  • the melted propylene homopolymer (A) was discharged from the spinneret at a discharge rate per nozzle hole (fr) of 0.18 g/min, and the cooling air flow rate per 1 m width (fa) was 6720 m 3 to the cooling section. /h/m, and melt spinning was performed by the spunbond method.
  • the temperature of the upper stage cooling air and the temperature of the lower stage cooling air are 23° C., and the height (h 1 ) of the upper stage cooling air supply section (first cooling air supply section) is ) was 0.75 .
  • Table 1 shows the average wind speed V1 of the cooling air supplied from the upper stage cooling air supply section to the cooling section and the average wind velocity V2 of the cooling air supplied to the cooling section from the lower stage cooling air supply section.
  • Anemomaster anemometer (Model 6114) manufactured by KANOMAX was used for wind speed measurement.
  • the upper and lower cooling air volume ratio (upper: lower), which is the ratio of the air volume of cooling air supplied from the upper cooling air supply unit to the cooling unit and the air volume of cooling air supplied from the lower cooling air supply unit to the cooling unit is as shown in Table 1.
  • a spunbond nonwoven fabric having a basis weight of 17 g/m 2 was produced by depositing the stretched fibers on the collecting surface and thermally embossing them with an area ratio of 10%.
  • Example 2 A spunbonded nonwoven fabric was produced in the same manner as in Experimental Example 1, except that the cooling air volume (fa) was changed to 5880 m 3 /hr/m by changing the average wind velocities V1 and V2 of the cooling air. bottom.
  • Example 3 A spunbond nonwoven fabric was produced in the same manner as in Experimental Example 2, except that the basis weight was changed to 34 g/m 2 .
  • Example 4 A spunbond nonwoven fabric was manufactured in the same manner as in Experimental Example 1, except that the cooling air volume (fa) was changed to 7560 m 3 /hr/m by changing the average wind speeds V1 and V2 of the cooling air. Tried. However, a spunbonded nonwoven fabric could not be obtained due to frequent yarn breakage during melt spinning.
  • Example 5 In Experimental Example 1, the discharge rate (fr) per nozzle hole was changed to 0.52 g/min, and the cooling air rate (fa) was reduced to 5880 m 3 /hr by changing the average wind velocities V1 and V2 of the cooling air. /m and the basis weight was changed to 34 g/m 2 , in the same manner as in Experimental Example 1, to produce a spunbond nonwoven fabric.
  • Example 6 An attempt was made to produce a spunbond nonwoven fabric in the same manner as in Experimental Example 1, except that the propylene homopolymer (B) was used and the conditions for producing the spunbond nonwoven fabric were changed as shown in Table 1. However, a spunbonded nonwoven fabric could not be obtained due to frequent yarn breakage during melt spinning.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'un non-tissé qui présente une excellente résistance à la traction et des fibres de petit diamètre. Ce non-tissé contient des fibres. La proportion de structures lamellaires filles dans les fibres n'est pas supérieure à 0,10.
PCT/JP2022/046281 2021-12-16 2022-12-15 Non-tissé, matériau sanitaire, et procédé de fabrication de non-tissé WO2023112995A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753606A2 (fr) * 1995-07-03 1997-01-15 J.W. Suominen Oy Méthode pour régler le transport interne d'adjuvants et additifs d'un polymer
WO2020129256A1 (fr) * 2018-12-21 2020-06-25 三井化学株式会社 Appareil de filage par fusion et procédé de production d'un tissu non-tissé
JP2021509930A (ja) * 2018-11-06 2021-04-08 エルジー・ケム・リミテッド プロピレン共重合体樹脂組成物およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753606A2 (fr) * 1995-07-03 1997-01-15 J.W. Suominen Oy Méthode pour régler le transport interne d'adjuvants et additifs d'un polymer
JP2021509930A (ja) * 2018-11-06 2021-04-08 エルジー・ケム・リミテッド プロピレン共重合体樹脂組成物およびその製造方法
WO2020129256A1 (fr) * 2018-12-21 2020-06-25 三井化学株式会社 Appareil de filage par fusion et procédé de production d'un tissu non-tissé

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