WO2019167851A1 - Non tissé filé-lié - Google Patents

Non tissé filé-lié Download PDF

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Publication number
WO2019167851A1
WO2019167851A1 PCT/JP2019/006917 JP2019006917W WO2019167851A1 WO 2019167851 A1 WO2019167851 A1 WO 2019167851A1 JP 2019006917 W JP2019006917 W JP 2019006917W WO 2019167851 A1 WO2019167851 A1 WO 2019167851A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
spunbonded nonwoven
acid amide
fiber
roll
Prior art date
Application number
PCT/JP2019/006917
Other languages
English (en)
Japanese (ja)
Inventor
大樹 島田
洋平 中野
羽根　亮一
Original Assignee
東レ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to JP2019541199A priority Critical patent/JP7283386B2/ja
Priority to CN201980015911.2A priority patent/CN111788345A/zh
Priority to KR1020207024480A priority patent/KR102487720B1/ko
Publication of WO2019167851A1 publication Critical patent/WO2019167851A1/fr

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Classifications

    • 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
    • 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
    • D04H3/08—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

Definitions

  • the present invention relates to a spunbonded nonwoven fabric that is composed of fibers made of polyolefin resin and is particularly suitable for use as a sanitary material application.
  • nonwoven fabrics for sanitary materials such as paper diapers and sanitary napkins are required to have a texture, a touch, flexibility and high productivity.
  • the top sheet of a disposable diaper is a material that directly touches the skin, it is one of the applications that have a high demand for touch and flexibility.
  • a fiber having a relatively low melt flow rate that is, a high viscosity polypropylene resin is used as a raw material, and the spinning speed is increased to 5,000 m / min. Since the diameter is reduced, thread breakage is likely to occur, and stable production is difficult.
  • Patent Document 1 also shows that by adding an ester compound having a melting point of 70 ° C. or higher, a non-woven fabric is given a smooth feeling and the touch is improved.
  • an ester compound having a melting point of 70 ° C. or higher although the coefficient of friction certainly decreases, the smoothness of the nonwoven fabric is not sufficiently satisfactory in light of the required level, and further improvement in the touch has been demanded.
  • Patent Document 2 since a polypropylene resin having a relatively large melt flow rate is used as a raw material and the diameter is reduced by setting the draft ratio to 1500 or more, a low-viscosity raw material has a large pore size. It is necessary to spin with a base. As a result, there is a problem that the back pressure of the base is not easily applied, uniform spinning cannot be performed, and yarn breakage and fiber diameter unevenness are likely to occur, and there is room for improvement in formation uniformity.
  • the object of the present invention is made of polyolefin fibers having a fine single fiber diameter and good spinnability and high productivity.
  • the texture is uniform, the surface is smooth, and the texture and the touch.
  • An object of the present invention is to provide a spunbonded nonwoven fabric having excellent and higher flexibility.
  • the spunbonded nonwoven fabric of the present invention is a spunbonded nonwoven fabric composed of fibers made of polyolefin resin, and the average single fiber diameter of the fibers is 6.5 to 11.9 ⁇ m, and fiber dispersion by reflected light luminance is performed.
  • a spunbonded nonwoven fabric having a degree of 10 or less and a surface roughness SMD of at least one side by the KES method of 1.0 to 2.6 ⁇ m.
  • the apparent density of the spunbonded nonwoven fabric is 0.05 to 0.3 g / cm 3 .
  • the average friction coefficient MIU according to the KES method of at least one surface of the spunbond nonwoven fabric is 0.1 to 0.5.
  • the variation MMD of the average friction coefficient of the spunbonded nonwoven fabric by the KES method is 0.008 or less.
  • the melt flow rate of the spunbond nonwoven fabric is 155 to 850 g / 10 minutes.
  • the polyolefin resin contains a fatty acid amide compound having 23 to 50 carbon atoms.
  • the amount of the fatty acid amide compound added is 0.01 to 5.0% by mass.
  • the fatty acid amide compound is ethylene bis stearamide.
  • the spunbonded nonwoven fabric is composed of fibers made of polypropylene resin.
  • the fiber is made of polyolefin fibers having a fine single fiber diameter and good spinnability and high productivity, uniform texture, smooth surface, excellent texture and touch, and high flexibility.
  • a spunbond nonwoven fabric is obtained. From these characteristics, the spunbonded nonwoven fabric of the present invention can be suitably used particularly for hygiene materials.
  • the spunbonded nonwoven fabric of the present invention is a spunbonded nonwoven fabric composed of fibers made of polyolefin resin, and the average single fiber diameter of the fibers is 6.5 to 11.9 ⁇ m, and fiber dispersion by reflected light luminance is performed.
  • a spunbonded nonwoven fabric having a degree of 10 or less and a surface roughness SMD of at least one side by the KES method (Kawabata Evaluation System) of 1.0 to 2.6 ⁇ m.
  • polyolefin resin examples of the polyolefin resin used in the present invention include a polypropylene resin and a polyethylene resin.
  • polypropylene resin examples include a propylene homopolymer or a copolymer of propylene and various ⁇ -olefins.
  • polyethylene resin examples include ethylene homopolymers and copolymers of ethylene and various ⁇ -olefins. From the viewpoint of spinnability and strength characteristics, a polypropylene resin is particularly preferably used.
  • the proportion of the propylene homopolymer is preferably 60% by mass or more, more preferably 70% by mass or more, and further preferably 80% by mass or more. By setting it in the above range, good spinnability can be maintained and the strength can be improved.
  • polyolefin resin used in the present invention a mixture of two or more kinds may be used, and a resin composition containing other olefin resin, thermoplastic elastomer or the like may be used.
  • the composite fiber that combines the above polyolefin resins.
  • the composite form of the composite fiber include composite forms such as a concentric core-sheath type, an eccentric core-sheath type, and a sea-island type.
  • attached uniformly by heat bonding it is a preferable aspect to set it as a concentric core-sheath type composite form.
  • the antioxidant in the polyolefin resin used in the present invention, the antioxidant, weathering stabilizer, light stabilizer, antistatic agent, antifogging agent, antiblocking agent, lubricant, which are usually used within the range not impairing the effects of the present invention, Nucleating agents, additives such as pigments, or other polymers can be added as necessary.
  • the melting point of the polyolefin resin used in the present invention is preferably 80 to 200 ° C., more preferably 100 to 180 ° C., and further preferably 120 to 180 ° C.
  • the melting point is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and further preferably 120 ° C. or higher, heat resistance that can withstand practical use can be easily obtained.
  • the melting point is preferably 200 ° C. or less, more preferably 180 ° C. or less, it becomes easy to cool the yarn discharged from the die, and it becomes easy to perform stable spinning by suppressing the fusion of fibers.
  • the melt flow rate (hereinafter sometimes referred to as MFR) of the polyolefin resin that is the raw material of the spunbond nonwoven fabric of the present invention is preferably 155 to 850 g / 10 minutes, more preferably 155 to 600 g / 10. Min, more preferably 155 to 400 g / 10 min.
  • polypropylene is measured at a load of 2.16 kg and a temperature of 230 ° C.
  • polyethylene is measured at a load of 2.16 kg and a temperature of 190 ° C.
  • the MFR of the polyolefin resin is preferably 10 to 1000 g / 10 minutes, more preferably 20 to 800 g / 10 minutes, and still more preferably 30 to 600 g / 10 minutes. It is. By setting it as the said range, it can prevent that a viscosity spot arises partially in the blended polyolefin resin, and a fineness becomes non-uniform
  • the spunbonded nonwoven fabric of the present invention contains a fatty acid amide compound having a carbon number of 23 or more and 50 or less in a polyolefin fiber composed of a polyolefin resin as a constituent fiber in order to improve slipperiness and flexibility. It is a preferred embodiment.
  • the fatty acid amide compound mixed with the polyolefin resin By setting the number of carbon atoms of the fatty acid amide compound mixed with the polyolefin resin to preferably 23 or more, and more preferably 30 or more, the fatty acid amide compound is prevented from being excessively exposed on the fiber surface, and spinnability and processing. It is excellent in stability and can maintain high productivity.
  • the number of carbon atoms of the fatty acid amide compound preferably 50 or less, more preferably 42 or less, the fatty acid amide compound can easily move to the fiber surface, and imparts slipperiness and flexibility to the spunbonded nonwoven fabric. Can do.
  • Examples of the fatty acid amide compound having 23 to 50 carbon atoms used in the present invention include saturated fatty acid monoamide compounds, saturated fatty acid diamide compounds, unsaturated fatty acid monoamide compounds, and unsaturated fatty acid diamide compounds.
  • a fatty acid amide compound having 23 to 50 carbon atoms tetradocosanoic acid amide, hexadocosanoic acid amide, octadocosanoic acid amide, nervonic acid amide, tetracosaentapentic acid amide, nisic acid amide, ethylene bislauric acid amide, Methylene bis lauric acid amide, ethylene bis stearic acid amide, ethylene bis hydroxy stearic acid amide, ethylene bis behenic acid amide, hexamethylene bis stearic acid amide, hexamethylene bis behenic acid amide, hexamethylene hydroxy stearic acid amide, distearyl adipic acid Amide, distearyl sebacic acid amide, ethylene bis oleic acid amide, ethylene bis erucic acid amide, hexamethylene bis oleic acid amide, etc. It can also
  • ethylene bis stearamide which is a saturated fatty acid diamide compound
  • Ethylene bis-stearic acid amide is melt-spinnable due to its excellent thermal stability. Fibers made of polyolefin resin blended with this ethylene bis-stearic acid amide keep slipperiness while maintaining high productivity. And a spunbonded nonwoven fabric excellent in flexibility can be obtained.
  • the amount of the fatty acid amide compound added to the fiber made of the polyolefin resin is 0.01 to 5.0% by mass.
  • the addition amount of the fatty acid amide compound is preferably 0.01 to 5.0% by mass, more preferably 0.1 to 3.0% by mass, and still more preferably 0.1 to 1.0% by mass. It is possible to impart moderate slipperiness and flexibility while maintaining spinnability.
  • the amount added here refers to the mass percentage of the fatty acid amide compound added to the entire polyolefin resin constituting the spunbonded nonwoven fabric of the present invention. For example, even when the fatty acid amide compound is added only to the sheath component constituting the core-sheath type composite fiber, the addition ratio relative to the total amount of the core-sheath component is calculated.
  • the additive is solvent extracted from the fiber, and quantitative analysis is performed using liquid chromatography mass spectrometry (LS / MS) or the like. A method is mentioned.
  • the extraction solvent is appropriately selected according to the type of the fatty acid amide compound. For example, in the case of ethylenebisstearic acid amide, a method using a chloroform-methanol mixed solution or the like can be mentioned as an example.
  • the fibers constituting the spunbonded nonwoven fabric of the present invention have an average single fiber diameter of 6.5 to 11.9 ⁇ m.
  • the spun bond nonwoven fabric can be stably produced with good quality by preventing deterioration of spinnability. be able to.
  • the average single fiber diameter is set to 11.9 ⁇ m or less, preferably 11.2 ⁇ m or less, more preferably 10.6 ⁇ m or less, the spunbonded nonwoven fabric having improved flexibility and high uniformity can be obtained. Can do.
  • the value calculated by the following procedures shall be employ
  • a polyolefin-based resin is melt-spun, pulled and stretched by an ejector, and then a nonwoven fiber web is collected on the net.
  • Ten small sample pieces (100 ⁇ 100 mm) are collected at random.
  • the average single fiber diameter ( ⁇ m) is calculated from the average value of the 100 measured values.
  • the fibers constituting the spunbonded nonwoven fabric of the present invention preferably have a single fiber diameter CV value of 7% or less.
  • the CV value of the single fiber diameter is preferably 7% or less, more preferably 6% or less, and even more preferably 5% or less to prevent the surface from feeling rough and a highly uniform spunbond nonwoven fabric. It can be.
  • the CV value of the single fiber diameter is dominated by the back pressure of the spinneret, the yarn cooling conditions, and the uniformity of the drawing conditions, and can be controlled by appropriately adjusting them.
  • the fiber dispersion degree by reflected light brightness of the spunbonded nonwoven fabric of the present invention is 10 or less.
  • the fiber dispersion by reflected light luminance is an index indicating the degree of dispersion of the fiber when the spunbonded nonwoven fabric is identified by dividing it with a 0.1 ⁇ 0.1 inch grid, and the smaller the fiber dispersion, A non-woven fabric that is uniformly dispersed and has excellent formation uniformity.
  • the fiber dispersity can be controlled by appropriately adjusting the melt flow rate of the spunbonded nonwoven fabric and the average single fiber diameter of the fibers.
  • luminance of the spun bond nonwoven fabric of this invention shall employ
  • a spunbond nonwoven fabric is pasted on a black mount (AC card black # 350).
  • a 6 ⁇ 6 inch (1200 ⁇ 1200 pixel) image is cut out from the scanned image.
  • each lattice the following formula is used to calculate the average value (average luminance) of luminance defined in the YUV color space for each pixel, and obtain the standard deviation of the average luminance.
  • ⁇ (Brightness of each pixel) 0.29891 ⁇ R + 0.58661 ⁇ G + 10.1448 ⁇ B
  • R, G, and B represent red, green, and blue luminances of the RGB color model, respectively.
  • the spunbonded nonwoven fabric is equally spaced in the width direction at 3 points per meter, the average value of the standard deviation of each point is obtained, and the second decimal place is rounded off to obtain the fiber dispersity.
  • the spunbonded nonwoven fabric of the present invention has a surface roughness SMD of at least one side by the KES method of 1.0 to 2.6 ⁇ m.
  • the surface roughness SMD by the KES method can be controlled by appropriately adjusting the average single fiber diameter, the CV value of the single fiber diameter, the fiber dispersity, and the like.
  • the surface roughness SMD by the KES method adopts a value measured as follows. (1) Three test pieces having a width of 200 mm ⁇ 200 mm are collected from the spunbonded nonwoven fabric at equal intervals in the width direction of the spunbonded nonwoven fabric. (2) Set the test piece on the sample stage. (3) The surface of the test piece is scanned with a contact for measuring surface roughness (material: ⁇ 0.5 mm piano wire, contact length: 5 mm) applied with a load of 10 gf, and the average deviation of the uneven shape on the surface is measured. To do.
  • the average friction coefficient MIU according to the KES method of at least one side of the spunbonded nonwoven fabric of the present invention is preferably 0.1 to 0.5.
  • the average friction coefficient MIU is preferably 0.5 or less, more preferably 0.45 or less, and even more preferably 0.4 or less, thereby improving the slipperiness of the surface of the nonwoven fabric and improving the feel of the spunbond. It can be a non-woven fabric.
  • the average friction coefficient MIU is preferably 0.1 or more, more preferably 0.15 or more, and even more preferably 0.2 or more, the lubricant is excessively added and the spinnability deteriorates, When the yarn is collected on the net, it is possible to prevent the yarn from slipping and getting worse.
  • the average friction coefficient MIU by the KES method can be controlled by adjusting the average single fiber diameter, fiber dispersion, etc., or adding a lubricant to the polyolefin resin.
  • the fluctuation MMD of the average friction coefficient according to the KES method on at least one side of the spunbond nonwoven fabric of the present invention is preferably 0.002 to 0.008.
  • the variation MMD of the average friction coefficient is preferably 0.008 or less, more preferably 0.0077 or less, and still more preferably 0.0075 or less, thereby further reducing the surface roughness of the spunbonded nonwoven fabric. it can.
  • the variation MMD of the average friction coefficient is preferably 0.002 or more, more preferably 0.004 or more, and further preferably 0.005 or more, so that the production facility becomes complicated or the productivity becomes extremely high. It can be prevented that it falls.
  • the variation MMD of the average friction coefficient by the KES method can be controlled by adjusting the average single fiber diameter, the CV value of the single fiber diameter, the fiber dispersity, or the like, or adding a lubricant to the polyolefin resin.
  • values measured as follows are used as the average friction coefficient MIU and the variation MMD of the average friction coefficient by the KES method.
  • Three test pieces having a width of 200 mm ⁇ 200 mm are collected from the spunbonded nonwoven fabric at equal intervals in the width direction of the spunbonded nonwoven fabric.
  • (3) The average friction coefficient is measured by scanning the surface of the test piece with a contact friction element (material: ⁇ 0.5 mm piano wire (20 parallel), contact area: 1 cm 2 ) applied with a load of 50 gf.
  • the texture of the spunbonded nonwoven fabric is evaluated by a sensory test.
  • the MFR of the spunbond nonwoven fabric of the present invention is preferably 155 to 850 g / 10 minutes.
  • the MFR is preferably 155 to 850 g / 10 minutes, more preferably 155 to 600 g / 10 minutes, and further preferably 155 to 400 g / 10 minutes.
  • the thinning behavior when the fiber is drawn is stabilized, Even if drawing is performed at a high spinning speed in order to increase productivity, stable spinning is possible. Further, by stabilizing the thinning behavior, the yarn swaying is suppressed, and unevenness when collecting in a sheet form is less likely to occur. Furthermore, since it becomes possible to draw stably at a high spinning speed, the fibers can be oriented and crystallized to obtain fibers having high mechanical strength.
  • melt flow rate (MFR) of the spunbonded nonwoven fabric according to the present invention a value measured by ASTM D1238 (Method A) is adopted.
  • polypropylene is measured at a load of 2.16 kg and a temperature of 230 ° C.
  • polyethylene is measured at a load of 2.16 kg and a temperature of 190 ° C.
  • the basis weight of the spunbond nonwoven fabric of the present invention is preferably 10 to 100 g / m 2 .
  • the basis weight is preferably 10 g / m 2 or more, more preferably 13 g / m 2 or more, and further preferably 15 g / m 2 or more, a spunbond nonwoven fabric having mechanical strength that can be used practically can be obtained.
  • the basis weight is preferably 100 g / m 2 or less, more preferably 50 g / m 2 or less, and even more preferably 30 g / m 2 or less, moderate flexibility suitable for use as a nonwoven fabric for sanitary materials can be obtained. It can be set as the spun bond nonwoven fabric which has.
  • the basis weight of the spunbond nonwoven fabric adopts a value measured by the following procedure according to “6.2 Mass per unit area” of JIS L1913 (2010).
  • the thickness of the spunbond nonwoven fabric of the present invention is preferably 0.05 to 1.5 mm.
  • a thickness of preferably 0.05 to 1.5 mm, more preferably 0.08 to 1.0 mm, and even more preferably 0.10 to 0.8 mm the sanitary material has flexibility and appropriate cushioning properties.
  • a spunbond nonwoven fabric for use a spunbond nonwoven fabric particularly suitable for use in disposable diaper applications can be obtained.
  • the thickness (mm) of a spun bond nonwoven fabric shall employ
  • a pressurizer having a diameter of 10 mm is used, and a thickness of 10 points per meter is measured in 0.01 mm units at equal intervals in the width direction of the nonwoven fabric with a load of 10 kPa.
  • the apparent density of the spunbonded nonwoven fabric of the present invention is preferably 0.05 to 0.3 g / cm 3 .
  • the apparent density is preferably 0.3 g / cm 3 or less, more preferably 0.25 g / cm 3 or less, and even more preferably 0.20 g / cm 3 or less, so that the fibers are densely packed and spanned. It can prevent that the softness
  • the apparent density is set to 0.05 g / cm 3 or more, more preferably set to 0.08 g / cm 3 or more, more preferably by a 0.10 g / cm 3 or more, fluffing and delamination occurs Spunbonded nonwoven fabric with sufficient strength and handleability to withstand practical use can be obtained.
  • the apparent density (g / cm 3 ) is calculated based on the following formula from the basis weight and thickness before rounding, and rounded off to the third decimal place.
  • Apparent density (g / cm 3 ) [weight per unit area (g / m 2 )] / [thickness (mm)] ⁇ 10 ⁇ 3
  • the bending resistance of the spunbonded nonwoven fabric of the present invention is preferably 70 mm or less.
  • the bending resistance can be adjusted by the basis weight, single fiber diameter, and thermocompression bonding conditions (compression bonding rate, temperature, linear pressure, etc.).
  • the average bending stiffness B by the KES method of the spunbonded nonwoven fabric of the present invention is preferably 0.001 to 0.02 gf ⁇ cm 2 / cm.
  • the average bending stiffness B by the KES method is preferably 0.02 gf ⁇ cm 2 / cm or less, more preferably 0.017 gf ⁇ cm 2 / cm or less, and further preferably 0.015 gf ⁇ cm 2 / cm or less.
  • the average bending stiffness B by the KES method is extremely low, the handling property may be inferior, and therefore the average bending stiffness B is preferably 0.001 gf ⁇ cm 2 / cm or more.
  • the average bending stiffness B by the KES method can be adjusted by the basis weight, single fiber diameter, and thermocompression bonding conditions (compression bonding rate, temperature, linear pressure, etc.).
  • the stress at 5% elongation per unit weight of the spunbonded nonwoven fabric of the present invention (hereinafter sometimes referred to as 5% modulus per unit weight) is 0.06 to 0.33 (N / 25 mm) / (g / m 2 ), more preferably 0.13 to 0.30 (N / 25 mm) / (g / m 2 ), and still more preferably 0.20 to 0.27 (N / 25 mm) / (G / m 2 ).
  • 5% modulus per unit weight is 0.06 to 0.33 (N / 25 mm) / (g / m 2 ), more preferably 0.13 to 0.30 (N / 25 mm) / (g / m 2 ), and still more preferably 0.20 to 0.27 (N / 25 mm) / (G / m 2 ).
  • the stress at 5% elongation per unit weight of the spunbonded nonwoven fabric is measured according to the following procedure according to “6.3 Tensile strength and elongation (ISO method)” of JIS L1913 (2010).
  • the value to be adopted shall be adopted.
  • Three test pieces of 25 mm ⁇ 300 mm are collected per 1 m width in each of the longitudinal direction of the nonwoven fabric (longitudinal direction of the nonwoven fabric) and the lateral direction (width direction of the nonwoven fabric).
  • a test piece is set on a tensile tester with a grip interval of 200 mm.
  • the spunbond nonwoven fabric of the present invention is a long fiber nonwoven fabric produced by a spunbond method.
  • the method for producing the nonwoven fabric is not particularly limited, and examples thereof include a spunbond method, a flash spinning method, a wet method, a card method, and an airlaid method.
  • the spunbond method is excellent in productivity and mechanical strength, and can suppress fluffing and fiber dropping that are likely to occur in a short fiber nonwoven fabric.
  • productivity and formation uniformity are improved by laminating the collected spunbond nonwoven fiber web or thermobonded spunbond nonwoven fabric (both are written as S) with SS, SSS and SSSS. Therefore, this is a preferred embodiment.
  • a melted thermoplastic resin is first spun out as a long fiber from a spinneret, and this is sucked and stretched with compressed air by an ejector, and then the fiber is collected on a moving net to obtain a nonwoven fiber web. . Furthermore, the obtained non-woven fiber web is subjected to a heat bonding treatment to obtain a spunbond nonwoven fabric.
  • the shape of the spinneret and the ejector is not particularly limited, but various shapes such as a round shape and a rectangular shape can be employed.
  • the combination of a rectangular base and a rectangular ejector is used because the amount of compressed air used is relatively small, the energy cost is excellent, the yarns are not easily fused or scratched, and the yarn is easy to open. Preferably used.
  • the polyolefin resin is melted in an extruder, weighed and supplied to a spinneret, and is spun as a long fiber.
  • the spinning temperature when melting and spinning the polyolefin resin is preferably 200 to 270 ° C., more preferably 210 to 260 ° C., and still more preferably 220 to 250 ° C.
  • the back pressure of the spinneret is preferably 0.1 to 6.0 MPa.
  • the back pressure is preferably 0.1 to 6.0 MPa, more preferably 0.3 to 6.0 MPa, and even more preferably 0.5 to 6.0 MPa, the discharge uniformity deteriorates and the fiber diameter It is possible to prevent variation and increase in size of the base in order to increase pressure resistance.
  • the back pressure of the spinneret can be adjusted by the discharge hole diameter, discharge hole depth, spinning temperature, etc. of the spinneret, and the contribution of the discharge hole diameter is particularly significant.
  • the spun long fiber yarn is then cooled.
  • a method for cooling the spun yarn for example, a method for forcibly blowing cold air onto the yarn, a method for natural cooling at the ambient temperature around the yarn, and a method for adjusting the distance between the spinneret and the ejector Or a combination of these methods can be employed.
  • the cooling conditions can be appropriately adjusted and adopted 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 pulled and compressed by compressed air injected from the ejector.
  • the spinning speed is preferably 3,500 to 6,500 m / min, more preferably 4,000 to 6,500 m / min, and further preferably 4,500 to 6,500 m / min.
  • the spinning speed is preferably 3,500 to 6,500 m / min, more preferably 4,000 to 6,500 m / min, and further preferably 4,500 to 6,500 m / min.
  • the obtained long fibers are collected on a moving net to obtain a nonwoven fiber web.
  • a non-woven fiber web is temporarily bonded by contacting a heat flat roll from one side of the net on the net.
  • the intended non-woven fiber web can be thermally bonded to obtain the intended spunbond nonwoven fabric.
  • the method for thermally bonding the nonwoven fiber web is not particularly limited.
  • a hot embossing roll in which engravings (uneven portions) are respectively formed on a pair of upper and lower roll surfaces, a roll having a flat (smooth) one roll surface, and the other
  • a method of heat bonding with various rolls such as a heat embossing roll consisting of a combination with a sculpture (uneven portion) on the surface of the roll and a heat calendering roll consisting of a combination of a pair of upper and lower flat (smooth) rolls
  • Examples of the method include ultrasonic bonding in which heat welding is performed by ultrasonic vibration of a horn.
  • a hot embossing roll made of a combination of a roll having a flat (smooth) roll surface and a roll having a sculpture (uneven portion) on the other roll surface. It is an aspect.
  • a metal roll and a metal roll are used as a surface material of the hot embossing roll. Pairing is a preferred embodiment.
  • the embossed adhesion area ratio by such a hot embossing roll is preferably 5 to 30%.
  • the adhesion area preferably 5% or more, more preferably 8% or more, and even more preferably 10% or more, it is possible to obtain a strength that can be practically used as a spunbonded nonwoven fabric.
  • the adhesive area is preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less, so that it is suitable as a spunbond nonwoven fabric for sanitary materials, particularly suitable for use in disposable diapers. Flexibility can be obtained. Even when ultrasonic bonding is used, the bonding area ratio is preferably in the same range.
  • “Adhesion area” here refers to the ratio of the bonded portion to the entire spunbonded nonwoven fabric. Specifically, when heat bonding is performed using a roll having a pair of irregularities, the spunbonded nonwoven fabric of the portion (adhesive portion) where the convex portion of the upper roll and the convex portion of the lower roll overlap and contact the nonwoven fiber web The percentage of the total. Moreover, when heat-adhering with the roll which has an unevenness
  • the shape of the bonded portion by heat embossing roll or ultrasonic bonding is not particularly limited, and for example, a circular shape, an elliptical shape, a square shape, a rectangular shape, a parallelogram shape, a rhombus shape, a regular hexagon shape, and a regular octagon shape can be used.
  • the adhesion part exists uniformly in the longitudinal direction (conveying direction) and the width direction of the spunbonded nonwoven fabric at regular intervals. By doing in this way, the dispersion
  • the surface temperature of the hot embossing roll at the time of heat bonding is preferably -50 to -15 ° C with respect to the melting point of the polyolefin resin used.
  • the surface temperature of the hot roll is preferably ⁇ 50 ° C. or more, more preferably ⁇ 45 ° C. or more with respect to the melting point of the polyolefin resin.
  • a spunbond nonwoven fabric having a strength that can be used for practical use can be obtained. Can do.
  • the surface temperature of the hot embossing roll to preferably ⁇ 15 ° C. or less, more preferably ⁇ 20 ° C.
  • the linear pressure of the hot embossing roll during heat bonding is preferably 50 to 500 N / cm.
  • the linear pressure of the roll is preferably 50 N / cm or more, more preferably 100 N / cm or more, and even more preferably 150 N / cm or more, a spunbonded nonwoven fabric having a strength that can be used for practical use can be obtained. be able to.
  • the linear pressure of the hot embossing roll is preferably 500 N / cm or less, more preferably 400 N / cm or less, and even more preferably 300 N / cm or less, particularly as a spunbond nonwoven fabric for sanitary materials, especially for disposable diapers. A moderate flexibility suitable for use in can be obtained.
  • thermocompression bonding can be performed by a thermal calender roll comprising a pair of upper and lower flat rolls before and / or after thermal bonding with the hot embossing roll.
  • a pair of upper and lower flat rolls is a metal roll or elastic roll with no irregularities on the surface of the roll, and a pair of metal roll and metal roll, or a pair of metal roll and elastic roll Can be used.
  • an elastic roll is a roll which consists of a material which has elasticity compared with a metal roll here.
  • the elastic roll include so-called paper rolls such as paper, cotton and aramid paper, and urethane-based resins, epoxy-based resins, silicon-based resins, polyester-based resins, hard rubbers, and resin-made rolls made of a mixture thereof. Is mentioned.
  • the spunbonded nonwoven fabric of the present invention will be specifically described based on examples.
  • the measurement is performed based on the method described above unless otherwise specified.
  • MFR Melt flow rate
  • Fiber dispersion by reflected light brightness of spunbond nonwoven fabric In the measurement of the fiber dispersion degree by the reflected light luminance of the spunbond nonwoven fabric, a color composite machine “DocuCentre-VI C4471 PFS” (Fuji Xerox Co., Ltd.) was used for image scanning.
  • Average friction coefficient MIU of spunbond nonwoven fabric by KES method change MMD of average friction coefficient of spunbond nonwoven fabric by KES method MMD: For the measurement, an automated surface tester “KES-FB4-AUTO-A” manufactured by Kato Tech was used. The average friction coefficient MIU was measured on both sides of the spunbonded nonwoven fabric, and Table 1 lists the smaller value of these.
  • melt flow rate (MFR) of spunbonded nonwoven fabric (g / 10 min): The melt flow rate of the spunbonded nonwoven fabric was measured under the conditions of a load of 2160 g and a temperature of 230 ° C. according to ASTM D1238.
  • Example 1 A polypropylene resin made of a homopolymer having a melt flow rate (MFR) of 200 g / 10 min and a melting point of 163 ° C. is melted by an extruder, and a spinning temperature is changed from a rectangular die having a hole diameter ⁇ of 0.30 mm and a hole depth of 2 mm. Spinning was performed at 235 ° C. and a single hole discharge rate of 0.32 g / min. After spinning and solidifying the spun yarn, this was pulled and stretched by a compressed air with an ejector pressure of 0.35 MPa in a rectangular ejector and collected on a moving net. This formed a nonwoven fibrous web of polypropylene long fibers.
  • MFR melt flow rate
  • the formed spunbond nonwoven fiber web was heated under the conditions of linear pressure: 300 N / cm and thermal bonding temperature: 130 ° C. using a pair of upper and lower hot embossing rolls composed of the following upper roll and lower roll.
  • the spun bond nonwoven fabric of 18 g / m ⁇ 2 > of fabric weight was obtained by adhere
  • Example 2 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the polypropylene resin made of a homopolymer had an MFR of 155 g / 10 min, a melting point of 163 ° C., and the ejector pressure was 0.20 MPa.
  • the average single fiber diameter was 11.8 ⁇ m, and the spinning speed calculated from this was 3,216 m / min.
  • the spinnability no yarn breakage was observed after spinning for 1 hour.
  • Table 1 The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • Example 3 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the polypropylene resin comprising a homopolymer had an MFR of 800 g / 10 min and a melting point of 163 ° C.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 8.4 micrometers, and the spinning speed converted from this was 6,422 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour. The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • Example 4 A spunbonded nonwoven fabric was made by the same method as in Example 1 except that the polypropylene resin made of a homopolymer had an MFR of 800 g / 10 min, a melting point of 163 ° C., and the single hole discharge rate was 0.21 g / min. Obtained.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 7.2 micrometers, and the spinning speed converted from this was 5,668 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour. The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • Example 5 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that the polypropylene resin made of a homopolymer had an MFR of 155 g / 10 min and the ejector pressure was 0.38 MPa.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 10.1 micrometers, and the spinning speed converted from this was 4,393 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour. The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • Example 6 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that a polypropylene resin composed of a homopolymer was used as a fatty acid amide compound to which 1.0% by mass of ethylenebisstearic acid amide was added.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 10.1 micrometer, and the spinning speed converted from this was 4,352 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour.
  • Table 1 The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • Example 1 Except that the homopolymer polypropylene resin had an MFR of 60 g / 10 min, a melting point of 163 ° C., a single hole discharge rate of 0.43 g / min, and an ejector pressure of 0.15 MPa.
  • a spunbonded nonwoven fabric was obtained by the same method. Regarding the properties of the fibers constituting the formed spunbond nonwoven fiber web, the average single fiber diameter was 14.0 ⁇ m, and the spinning speed calculated from this was 3,070 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour. When the ejector pressure was 0.35 MPa under the same conditions, yarn breakage occurred frequently and spinning was impossible.
  • the results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1.
  • the obtained spunbonded non-woven fabric had a large average single fiber diameter and fiber dispersity, and as a result, the surface roughness SMD was also large.
  • Example 2 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1, except that the single-hole discharge rate was 0.43 g / min and the ejector pressure was 0.30 MPa. Regarding the properties of the fibers constituting the spunbond nonwoven fiber web, the average single fiber diameter was 12.9 ⁇ m, and the spinning speed calculated from this was 3,617 m / min. As for the spinnability, no yarn breakage was observed after spinning for 1 hour. The results of evaluating the obtained spunbonded nonwoven fabric are shown in Table 1. Although the obtained spunbonded nonwoven fabric had a small fiber dispersion, the average single fiber diameter was large, and thus the surface roughness SMD was also large.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 12.5 micrometers, and the spinning speed converted from this was 5,015 m / min. As for the spinnability, the yarn breakage occurred frequently during spinning for 1 hour, which was poor.
  • the formed spunbond nonwoven fiber web was heated under the conditions of linear pressure: 300 N / cm and thermal bonding temperature: 130 ° C. using a pair of upper and lower hot embossing rolls composed of the following upper roll and lower roll. Bonding was performed to obtain a spunbonded nonwoven fabric having a basis weight of 17 g / m 2 .
  • the obtained spunbond nonwoven fabric a portion where yarn breakage was not mixed was selected and evaluated. The results are shown in Table 1.
  • the obtained spunbonded non-woven fabric had a large average single fiber diameter and fiber dispersity, and as a result, the surface roughness SMD was also large.
  • the characteristic of the fiber which comprises the formed spunbond nonwoven fiber web was an average single fiber diameter of 8.4 micrometers, and the spinning speed converted from this was 6,980 m / min. As for the spinnability, the yarn breakage occurred frequently during spinning for 1 hour, which was poor.
  • the formed spunbond nonwoven fiber web was heated under the conditions of linear pressure: 300 N / cm and thermal bonding temperature: 130 ° C. using a pair of upper and lower hot embossing rolls composed of the following upper roll and lower roll. Bonding was performed to obtain a spunbonded nonwoven fabric having a basis weight of 17 g / m 2 .
  • the average single fiber diameter is 6.5 to 11.9 ⁇ m
  • the fiber dispersity by reflected light luminance is 10 or less
  • the surface roughness SMD by KES method is 1.0 to 2.6 ⁇ m.
  • the spunbonded nonwoven fabrics of Examples 1 to 6 had a uniform texture, a smooth surface, excellent texture and touch, and higher flexibility.
  • the average friction coefficient tended to increase as the average single fiber diameter became smaller
  • the spunbonded nonwoven fabric of Example 6 to which ethylene bisstearic acid amide was added had a reduced average friction coefficient, and a smooth feeling and flexibility. This is particularly suitable for use as a sanitary material.
  • the average single fiber diameter and fiber dispersibility shown in Comparative Example 1 and Comparative Example 3 are large, the spunbonded nonwoven fabric having a large surface roughness SMD by the KES method, the average single fiber diameter shown in Comparative Example 2 is large, and by the KES method A spunbonded nonwoven fabric having a large surface roughness SMD and a spunbonded nonwoven fabric having a high fiber dispersion due to reflected light brightness and a large surface roughness SMD by the KES method shown in Comparative Example 4 have a rough feeling compared to the nonwoven fabric of the present invention. However, the texture and texture were inferior.
  • the spunbonded nonwoven fabrics using polypropylene resins having relatively low MFR shown in Comparative Examples 3 and 4 have poor spinnability at high spinning speeds and could not be stably produced.
  • the spunbonded nonwoven fabric of the present invention is highly productive, has a uniform texture, has a smooth surface, is excellent in texture and touch, and has high flexibility, so it is suitable for sanitary materials such as disposable paper diapers and napkins. Can be used. Among hygienic materials, it can be suitably used particularly for a back sheet of a paper diaper.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention concerne un non-tissé filé-lié hautement souple présentant une texture uniforme, une surface lisse et d'excellentes propriétés de confort et agréable au toucher, et qui comprend des fibres de polyoléfine hautement productives ayant une aptitude au filage préférable tout en présentant un petit diamètre moyen de fibre individuelle. Le non-tissé filé-lié constitué de fibres selon la présente invention comprend une résine de polyoléfine, le diamètre moyen de fibre individuelle des fibres étant compris entre 6,5 et 11,9 µm, le degré de dispersion des fibres obtenu au moyen de la luminosité d'une lumière réfléchie est inférieur ou égal à 10, et la rugosité de surface SMD d'au moins une surface du tissu, telle que mesurée par une technique de Kawabata (KES), est comprise entre 1,0 et 2,6 µm.
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CN115315547A (zh) * 2020-03-31 2022-11-08 东丽株式会社 纺粘无纺布
WO2023112995A1 (fr) 2021-12-16 2023-06-22 三井化学株式会社 Non-tissé, matériau sanitaire, et procédé de fabrication de non-tissé
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CN113355755A (zh) * 2020-12-15 2021-09-07 浙江青昀新材料科技有限公司 闪蒸法制备的聚合物片材
CN114657701B (zh) * 2022-03-28 2023-04-18 厦门当盛新材料有限公司 一种微波热合闪蒸纺丝无纺布工艺方法、微波热合装置以及无纺布制备设备

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