[0001]The present invention relates to a spunbonded nonwoven fabric, a method for producing a spunbonded nonwoven fabric, and an embossed roll.
Background technology
[0002]In recent years, non-woven fabrics have been widely used in various applications because of their excellent breathability and flexibility. Therefore, the non-woven fabric is required to have various properties according to its use, and is also required to improve the properties.
[0003]
　In particular, the long-fiber non-woven fabric obtained by the spunbond method is a base for, for example, absorbent articles (paper diapers, sanitary napkins, etc.), medical materials (surgical wear gowns, drapes, sanitary masks, sheets, medical gauze, compresses). It is applied to cloth etc.). In applications such as absorbent articles and medical materials, since it has a portion that comes into direct contact with the skin, high flexibility is particularly required.
[0004]
　For example, Patent Documents 1 to 7 propose spunbonded nonwoven fabrics to which various properties such as flexibility are imparted.
Prior art literature
Patent documents
[0005]
Patent Document 1: Japanese Patent Application
Laid-Open No. 57-167442 Patent Document 2: Japanese Patent Application Laid-Open No. 01-201567
Patent Document 3: Japanese Patent Application Laid-Open No. 01-229871
Patent Document 4: International Publication No. 2007/091444
Patent Document 5: Special Open 2015-108213
Patent Document 6: Japanese Patent Application Laid-Open No. 2016-41858
Patent Document 7: Japanese Patent Application Laid-Open No. 2016-5545
Outline of the invention
Problems to be solved by the invention
[0006]
　In recent years, there has been an increasing demand for bulkiness and flexibility of spunbonded non-woven fabrics. However, the conventional spunbonded non-woven fabric may not have sufficient bulkiness and flexibility. Therefore, in reality, there is room for further improvement in order to improve the bulkiness and flexibility of the spunbonded non-woven fabric.
　Furthermore, in recent years, spunbonded non-woven fabrics have not only bulkiness and flexibility, but also excellent fluffiness, fit, etc. when spunbonded non-woven fabrics are pleated, that is, flexural rigidity (rigidity) is small. Is required.
[0007]
　Patent Document 5 discloses a non-woven fabric having excellent breathability, and focusing on the manufacturing method thereof, a three-dimensional shaping process is performed on the spunbonded non-woven fabric by a pair of gear rolls. When the three-dimensional shaping process using the meshing of the unevenness by the gear roll as described in Patent Document 5 is performed, the bulkiness is easily obtained, but the uneven shape causes stress against bending, and as a result, the bending rigidity is increased. There is a tendency to increase.
[0008]
　Further, the method for producing a non-woven fabric described in Patent Document 6 includes a step of adhering fibers to each other by hot air after preparing a side-by-side type long fiber non-woven web. When the heat entanglement step with hot air is performed after embossing in this way, the stress for bending increases, and as a result, the bending rigidity of the non-woven fabric tends to increase.
[0009]
　Further, in the manufacturing method described in Patent Document 7, after the spunbonded nonwoven fabric is produced by embossing, the brushing treatment is performed using a processing apparatus. When such secondary processing is performed, the feel to the touch is likely to be improved, but the uneven shape formed by the raising treatment tends to generate stress for bending, and as a result, the bending rigidity tends to increase.
[0010]
　An object of the present disclosure is to provide a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has sufficiently low flexural rigidity. Another object of the present invention is to provide a method for producing a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has low flexural rigidity. Further, it is an object of the present invention to provide an embossed roll which can obtain a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has sufficiently small flexural rigidity.
Means to solve problems
[0011]
　The present disclosure relates to, for example, the following <1> to <16>.
[0012]
<1>
　Containing fibers of thermoplastic polymer, thickness t, compression work WC measured by compression test by KES method, thickness TO by KES method at pressure 0.5 gf / cm 2 measured by compression test by KES method Thickness TM at pressure 50 gf / cm 2 measured in compression test, grain W, and longitudinal (MD) stiffness BR MD measured according to the 45 ° cantilever method described in JIS-L1096: 2010 , and A spunbonded non-woven fabric in which the rigidity and softness BR CD in the lateral direction (CD) satisfies the following conditions (A) to (F).
　(A): t ≧ 0.30 mm
　(B): WC ≧ 0.22 gf · cm / cm 2
　(C): TO-TM ≧ 0.25 mm
　(D): W ≦ 30 g / m 2
　(E): BR MD ≤40 mm
　(F): BR CD ≤25 mm
<2>
　The spunbonded non-woven fabric according to <1> having a crimping portion and a non-crimping portion.
<3>
　The spunbonded non-woven fabric according to <2>, wherein the area ratio of the pressure-bonded portion is 5% to 18%.
<4>
　The spunbonded non-woven fabric according to any one of <1> to <3>, wherein the fiber contains a crimped fiber.
<5>
　The spunbonded nonwoven fabric according to any one of <1> to <4>, wherein the thermoplastic polymer contains an olefin polymer.
<6>
　The spunbonded nonwoven fabric according to <5>, wherein the olefin-based polymer contains a propylene-based polymer.
<7>
　The spunbonded nonwoven fabric according to any one of <1> to <6>, wherein the average fiber diameter of the fibers is 5 μm to 20 μm.
<8>
　The spunbonded non-woven fabric according to any one of <1> to <7>, which is used as a sanitary material.
<9> The
　spunbonded non-woven fabric according to any one of <1> to <8>, which is a laminated body of spunbonded non-woven fabric.
<10> The
　thermoplastic polymer is melt-spun to form a continuous fiber group, the formed
　continuous fiber group is deposited on a mobile collecting member to form a non-woven web, and the formed non-woven fiber group is
　formed. The woven web is provided with convex portions and concave portions, and the area ratio of the convex portions is 5% to 18%, and the depth from the top surface of the convex portion to the bottom surface of the concave portion with respect to the area on the top surface of the convex portion. The embossed aspect ratio expressed by the ratio is 2.5 mm / mm 2 to 7.0 mm / mm 2.The
　method for producing a spunbonded nonwoven fabric according to any one of <1> to <9> , which comprises performing thermocompression bonding with an embossed roll having a Rockwell hardness of the base material of 35 HRC or more .
<11> The
　method for producing a spunbonded nonwoven fabric according to <10>, wherein the Rockwell hardness of the base material of the embossed roll is 35 HRC to 50 HRC.
<12>
　The production of the spunbonded nonwoven fabric according to <10> or <11>, wherein the ratio of the depth to the distance between the convex portions adjacent to each other in the rotation direction is 0.4 mm / mm to 1.0 mm / mm. Method.
<13> The
　method for producing a spunbonded nonwoven fabric according to any one of <10> to <12>, wherein the non-woven web is at least two layers of non-woven web.
<14>
　An embossed roll for thermocompression bonding a non-woven web, which
　is provided with a convex portion and a concave portion, and the area ratio of the convex portion is 5% to 18% with respect to the area on the top surface of the convex portion. The embossed aspect ratio represented by the ratio of the depths from the top surface of the convex portion to the bottom surface of the concave portion is 2.5 mm / mm 2 to 7.0 mm / mm 2 , and the Rockwell hardness of the base material is 35 HRC. The embossed roll that is over.
<15> The
　embossed roll according to <14>, wherein the rockwell hardness of the base material of the embossed roll is 35 HRC to 50 HRC.
<16>
　The embossing roll according to <14> or <15>, wherein the ratio of the depth to the distance between the convex portions adjacent to each other in the rotation direction is 0.4 mm / mm to 1.0 mm / mm.
The invention's effect
[0013]
　According to the present disclosure, a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has low flexural rigidity is provided. Further, a method for producing a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has low flexural rigidity is provided. Further, an embossed roll is provided which can obtain a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has low flexural rigidity.
A brief description of the drawing
[0014]
FIG. 1 is a schematic schematic view showing an example of an apparatus for manufacturing the spunbonded nonwoven fabric laminate of the present disclosure.
FIG. 2 is a schematic schematic diagram showing another example of an apparatus for manufacturing the spunbonded nonwoven fabric laminate of the present disclosure.
FIG. 3 is a schematic diagram showing an example of the embossed roll of the present disclosure.
FIG. 4A is a cross-sectional view taken along the line AA of the convex portion of the embossed roll shown in FIG.
FIG. 4B is a cross-sectional view taken along the line BB in the convex portion of the embossed roll shown in FIG.
5 is a perspective view of the convex portion of the embossed roll shown in FIG. 3 as viewed from the rotation direction.
Mode for carrying out the invention
[0015]
　Hereinafter, an example of a preferred embodiment of the spunbonded nonwoven fabric of the present disclosure will be described in detail.
　In the present disclosure, the numerical range represented by using "-" means a range including the numerical values ​​before and after "-" as the lower limit value and the upper limit value.
[0016]
　Spunbonded nonwoven fabric of the present disclosure include fibers of thermoplastic polymer, the thickness t, the compression work amount was measured by compression test according to KES method WC, pressure 0.5 gf / cm was measured by compression test according to KES Method 2 thickness at Thickness TM at pressure 50 gf / cm 2 measured by TO, KES method compression test, grain W, and longitudinal (MD) stiffness measured according to the 45 ° cantilever method described in JIS-L1096: 2010. The degree BR MD and the lateral (CD) rigidity and softness BR CD satisfy the following conditions (A) to (F).
　(A): t ≧ 0.30 mm
　(B): WC ≧ 0.22 gf · cm / cm 2
　(C): TO-TM ≧ 0.25 mm
　(D): W ≦ 30 g / m 2
　(E): BR MD ≤40 mm
　(F): BR CD ≤25 mm
[0017]
　The KES (Kawabata Assessment System) method is one of the methods for measuring the texture of a non-woven fabric and objectively evaluating it.
　Compression work amount WC, pressure 0.5 gf / cm 2 thickness at TO, and pressure 50 gf / cm 2 Thickness TM in is measured by KES method using a compression tester KES-FB3-A manufactured by KATO TECH Corporation. Specifically, the compression area 2 cm 2 between steel pressure plate with a circular plane, by the compression deformation rate 0.020 mm / sec, 0 gf / cm 2 from the maximum pressure 50 gf / cm 2 The samples were compressed to the original Make measurements while returning to.
[0018]
　The compression work amount WC represents the compression work amount in the compression test by the KES method. In the present disclosure, if the WC is less than 0.22 gf · cm / cm 2 , the flexibility of the spunbonded non-woven fabric is inferior. On the other hand, the larger the value of WC, the larger the amount of compression work, indicating that the flexibility is excellent. The preferable lower limit of WC is 0.24 gf · cm / cm 2 or more, and the more preferable lower limit is 0.26 gf · cm / cm 2 or more. The upper limit of WC is not particularly limited as long as it satisfies the conditions (A), (C), and (D). As the upper limit of WC, for example, 1.00 gf · cm / cm 2 or less is exemplified.
[0019]
　Pressure 0.5 gf / cm 2 Thickness TO in a pressure 0.5 gf / cm in a compression test according to KES Method 2 is the thickness of, the representative of the initial thickness. The TO is preferably 0.40 mm or more, and more preferably 0.50 mm or more.
　Pressure 50 gf / cm 2 Thickness TM in a pressure 50 gf / cm in a compression test according to KES Method 2 is the thickness of, the representative of the thickness at the time of maximum compression. The TM is preferably 0.10 mm or more, and more preferably 0.15 mm or more.
　TO-TM is the difference between the TO and the TM. The larger the TO-TM, the better the bulkiness. The preferable lower limit of TO-TM is 0.25 mm or more, and the more preferable lower limit is 0.30 mm or more. The upper limit of TO-TM is not particularly limited as long as it satisfies the conditions (A), (B), and (D). The upper limit of TO-TM is, for example, 1.00 mm or less.
[0020]
　The thickness t of the spunbonded nonwoven fabric of the present disclosure is 0.30 mm or more. From the viewpoint of improving flexibility, it is preferably 0.35 mm or more. The upper limit of the thickness t is not particularly limited, and may be, for example, 1.00 mm or less.
　The basis weight W of the spunbonded non-woven fabric of the present disclosure is 30 g / m 2 or less. The basis weight W may be 15 g / m 2 or less. The lower limit of the basis weight W is not particularly limited as long as it does not impair the flexibility, and may be, for example, 10 g / m 2 or more.
　The thickness may be measured according to JIS L 1096: 2010. Specific measuring methods of thickness and basis weight will be described in Examples described later.
[0021]
　The longitudinal (MD) stiffness BR MD measured according to the 45 ° cantilever method described in JIS-L1096: 2010 of the spunbonded non-woven fabric of the present disclosure is 40 mm or less. Further, the rigidity and softness BR CD in the lateral direction (CD) is 25 mm or less. From the viewpoint of reducing the flexural rigidity, the BR MD is preferably 35 mm or less, and more preferably 33 mm or less. From the same viewpoint, the BR CD is preferably 23 mm or less, and more preferably 18 mm or less.
　A specific method for measuring the rigidity and softness will be described in Examples described later.
[0022]
　The resin for forming the spunbonded non-woven fabric is not particularly limited as long as it is a resin capable of producing the non-woven fabric by the spunbond method. Specific examples of the resin include olefin-based polymers, polyester-based polymers, and polyamide-based polymers. Among these resins, an olefin polymer is preferable, and a propylene polymer is more preferable, from the viewpoint of excellent flexibility. The olefin-based polymer is a polymer containing an olefin as a structural unit. Examples of the olefin polymer include α-olefins alone or copolymers such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene. More specifically, for example, ethylene-based polymers such as high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE: ethylene / α-olefin random copolymer), and high-density polyethylene; propylene homopolymer, propylene. -Protin-based polymer such as α-olefin copolymer; 1-butene homopolymer, 1-butene polymer such as 1-butene / α-olefin copolymer, 4-methyl-1-pentene homopolymer , A crystalline olefin polymer such as a 4-methyl-1-pentene polymer such as a 4-methyl-1-pentene / α-olefin copolymer. In particular, the propylene-based polymer is a polymer containing the largest amount of propylene as a structural unit, and examples thereof include a propylene homopolymer and a copolymer containing the largest amount of propylene.
[0023]
　The propylene-based polymer is, for example, a homopolymer of propylene and a propylene / α-olefin random copolymer (for example, a random combination of propylene and one or more α-olefins having 2 to 8 carbon atoms. Polymer) is preferred. Specific examples of preferable α-olefins copolymerized with propylene from the viewpoint of excellent flexibility include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and the like. Can be mentioned. The content of α-olefin in the propylene / α-olefin random copolymer is not particularly limited, and is preferably, for example, 1 mol% to 10 mol%, and more preferably 1 mol% to 5 mol%. preferable.
[0024]
　The melting point (Tm) of the propylene-based polymer may be 125 ° C. or higher, or 125 ° C. to 165 ° C. The melt flow rate (MFR) (ASTM D-1238, 230 ° C., load 2160 g) may be 10 g / 10 min to 100 g / 10 min, or 20 g / 10 min to 70 g / 10 min.
[0025]
　The propylene-based polymer is usually a Ziegler-Natta type catalyst in which a so-called titanium-containing solid transition metal component and an organometallic component are combined, or Group 4 to Group 6 of the periodic table having at least one cyclopentadienyl skeleton. It is obtained by homopolymerizing propylene or copolymerizing propylene with a small amount of α-olefin by slurry polymerization, vapor phase polymerization, or bulk polymerization using a metallocene catalyst composed of the transition metal compound and the co-catalyst component.
[0026]
　If necessary, the propylene-based polymer may contain commonly used additives. Examples of the additive include antioxidants, weather stabilizers, light stabilizers, antistatic agents, hydrophilic agents, antifog agents, antiblocking agents, lubricants, nucleating agents, pigments and the like.
[0027]
　In order to form the spunbonded nonwoven fabric, the fiber may be a fiber containing one kind of thermoplastic polymer or a composite fiber containing two or more kinds of thermoplastic polymers. Further, the fiber for forming the spunbonded non-woven fabric may be a non-crimped fiber or a crimped fiber. From the viewpoint of forming a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has a smaller bending rigidity, the spunbonded nonwoven fabric preferably contains crimp fibers. The number of crimped fibers is not particularly limited, and examples thereof include 5 fibers / 25 mm or more. From the viewpoint of forming a spunbonded nonwoven fabric that is bulky, has excellent flexibility, and has a smaller bending rigidity, the number of crimps is preferably 20 pieces / 25 mm or more, and more preferably 25 pieces / 25 mm or more. The crimp fiber may be, for example, a composite fiber such as a side-by-side type or a core-sheath type.
[0028]
　When the spunbonded non-woven fabric contains crimp fibers and the crimp fibers are side-by-side type or core-sheath type composite fibers, for example, the following aspects are preferable as the crimp fibers. It has a first thermoplastic polymer component and a second thermoplastic polymer component, and the melting point of the first thermoplastic polymer component is 5 ° C. or more higher than the melting point of the second thermoplastic polymer component. The mass ratio of the thermoplastic polymer component of 1 to the second plastic resin component is 5/95 to 95/5 (mass ratio) (more preferably 5/95 to 50/50 (mass ratio), still more preferably 5). / 95 to 30/70 (mass ratio), and when the crimped fiber is a core-sheath type composite fiber, the mass ratio is the core / sheath ratio) as a preferable example. Can be mentioned.
　The first thermoplastic polymer component and the second thermoplastic polymer component may be propylene-based polymers. The crimped fibers contained in the spunbonded non-woven fabric can be obtained by performing composite melt spinning by the spunbonding method. The first thermoplastic resin component is preferably a mixture of a propylene / ethylene random copolymer and a propylene homopolymer, or a propylene homopolymer, and the second thermoplastic resin component is a propylene / ethylene random. It is preferably a copolymer.
[0029]
　The average fiber diameter of the fibers forming the spunbonded non-woven fabric is preferably in the range of 5 μm to 20 μm from the viewpoint of being bulky and excellent in flexibility. The lower limit of the average fiber diameter may be 7 μm or more. The upper limit of the average fiber diameter is more preferably 19 μm or less, still more preferably 18 μm or less.
　The fineness of the fibers forming the spunbonded non-woven fabric is preferably in the range of 0.2 dtex to 6.0 dtex from the viewpoint of being bulky and excellent in flexibility. The upper limit of the fineness is more preferably 4.0 dtex or less, still more preferably 3.0 dtex or less, still more preferably 2.5 dtex or less.
[0030]
　The spunbonded nonwoven fabric of the present disclosure may have a crimped portion and a non-crimped portion from the viewpoint of being bulky, excellent in flexibility, and having low flexural rigidity. The area ratio of the crimped portion is preferably 5% to 18%. A more preferable area ratio of the pressure-bonded portion is 7% or more and 15% or less. For the area ratio of the pressure-bonded portion, a test piece having a size of 10 mm × 10 mm was collected from the spunbonded non-woven fabric, and the contact surface of the test piece with the embossed roll was observed with an electron microscope (magnification: 100 times), and the observed non-woven fabric was observed. The ratio of the area of ​​the thermocompression-bonded portion to the area of.
[0031]
　The spunbonded non-woven fabric of the present disclosure may be a spunbonded non-woven fabric laminate depending on the intended use as long as the above-mentioned conditions (A) to (F) are satisfied. That is, the spunbonded non-woven fabric laminate of the present disclosure satisfies the above-mentioned conditions (A) to (F). Specifically, the laminated structure of the spunbonded non-woven fabric may be a spunbonded non-woven fabric laminated body in which the same spunbonded non-woven fabric is laminated, or may be a spunbonded non-woven fabric laminated body in which different spunbonded non-woven fabrics are laminated. Details of the definitions, preferred definitions, properties, examples and the like of the conditions (A) to (F) in the spunbonded nonwoven fabric laminate are described in the above-mentioned definitions, preferred definitions and properties of the conditions (A) to (F) in the spunbonded nonwoven fabric. Similar to details such as examples.
[0032]
　Further, the spunbonded non-woven fabric of the present disclosure or the spunbonded non-woven fabric laminate of the present disclosure can be used as a material such as a knitted fabric, a woven fabric, a non-woven fabric other than the spunbonded non-woven fabric, and a film (including a sheet), depending on the purpose. You may stick them together.
[0033]
　Examples of the uses of the spunbonded non-woven fabric and the spunbonded non-woven fabric laminate of the present disclosure include various uses such as sanitary materials, medical materials, and packaging materials. Examples of the sanitary materials to which the spunbonded non-woven fabric and the spunbonded non-woven fabric laminate of the present disclosure are applied include various sanitary materials. Specific examples thereof include disposable diapers, disposable pants, sanitary napkins, urine absorbing pads, pet sheets, disposable masks, and the like, and are applicable as these materials. In addition, it can be applied as a disposable surgical gown, a rescue gown, a medical gown, a surgical cap, a disposable cap, a medical material such as a medical film or a sheet, and a packaging material.
[0034]
　An example of a preferable manufacturing method for obtaining the spunbonded nonwoven fabric of the present disclosure is illustrated below.
　The method for producing a spunbonded nonwoven fabric of the present disclosure has the following items.
　Melting and spinning thermoplastic polymers to form continuous fiber groups.
　To form a non-woven web by depositing the formed continuous fiber group on a mobile collecting member. The formed non-woven web is provided with a convex portion and a concave portion, and the area ratio of the convex portion is 5% to 18%. The embossed aspect ratio expressed by the ratio of the depth to the bottom surface is 2.5 mm / mm 2 to 7.0 mm / mm 2 , and the rockwell hardness of the base material is 35 HRC or more. matter.
[0035]
　By having the above items, in the method for producing a spunbonded nonwoven fabric of the present disclosure, a spunbonded nonwoven fabric which is bulky, has excellent flexibility, and has low flexural rigidity can be obtained. In particular, in the method for producing a spunbonded nonwoven fabric of the present disclosure, a bulky and highly flexible spunbonded nonwoven fabric can be obtained without the need for secondary processing after thermocompression bonding with an embossed roll. Further, since the secondary processing is not performed, a spunbonded nonwoven fabric having low bending rigidity can be obtained.
　Further, the spunbonded nonwoven fabric manufacturing method of the present disclosure can be stably manufactured even when applied to a high-speed manufacturing method in which the production speed exceeds 500 m / min, for example.
[0036]
　The base material of the embossed roll may have a Rockwell hardness of 35 HRC to 50 HRC. The embossed roll has a ratio of the depth to the bottom surface of the concave portion to the distance between the convex portions adjacent to each other in the rotation direction (depth to the bottom surface of the concave portion / the distance between the convex portions adjacent to each other in the rotation direction) of 0.4 mm / mm or more. It may be 1.0 mm / mm.
[0037]
　The non-woven web may be at least two layers of non-woven web. When the non-woven web has two layers, it is deposited on the mobile collecting member to form the lower non-woven web (first non-woven web), and the upper non-woven web (first non-woven web) is placed on the lower non-woven web. 2 non-woven webs) may be formed.
[0038]
　Here, a method for producing the spunbonded nonwoven fabric of the present disclosure will be described with reference to FIG. FIG. 1 is a schematic schematic view showing an example of an apparatus for manufacturing the spunbonded nonwoven fabric laminate of the present disclosure. The spunbond manufacturing apparatus 100 shown in FIG. 1 includes a first spinning section 11A and a second spinning section 11B. The first spinning section 11A and the second spinning section 11B have the same constituent parts. The same components in the first spinning section 11A and the second spinning section 11B are designated by the same reference numerals, and the description thereof will be omitted.
[0039]
　The spunbond manufacturing apparatus 100 includes a first extruder 31A for extruding a thermoplastic polymer, a second extruder 31B for extruding a thermoplastic polymer, a spinneret 33 for melt-spinning a molten thermoplastic polymer, and spinning. The ejector 37 that draws the continuous fiber group 20 (20A, 20B) melt-spun from the base 33, the moving collecting member 51 that collects the stretched continuous fiber group 20, and the moving collecting member that collects the continuous fiber group 20. A suction unit 39 for efficiently collecting on the 51, an embossing roll 53 and a flat roll 55 for heat-bonding, and a winder 71 for winding the spunbonded non-woven fabric laminate 60 after heat-bonding are provided.
[0040]
　In the first spinning section 11A, first, the thermoplastic polymer is melt-spun from the spinneret 33 to form a continuous fiber group 20A. When the continuous fiber group 20A is a crimped continuous fiber group, the first thermoplastic polymer is extruded from the first extruder 31A, and the second thermoplastic polymer is extruded from the second extruder 31B to form a composite. It may be spun. Next, the continuous fiber group 20A is cooled by the cooling air 35 and stretched by the ejector 37. The stretched continuous fiber group 20A is efficiently collected on the moving collecting member 51 by the suction unit 39 provided at the lower part of the collecting surface of the moving collecting member 51, and the first non-woven web is collected. 40A is formed. In the second spinning portion 11B, the continuous fiber group 20B is formed in the same manner. The continuous fiber group 20B is laminated on the first non-woven web 40A, the second non-woven web 40B is formed, and the non-woven web having a laminated structure is formed. The first non-woven web 40A is the lower non-woven web layer, and the second non-woven web 40B is the upper non-woven web. The non-woven web having a laminated structure is thermocompression bonded by an embossed roll 53 and a flat roll 55 to obtain a spunbonded non-woven fabric laminated body 60. After that, the spunbonded non-woven fabric laminate 60 is wound up by the winder 71.
[0041]
　Here, in the spunbonded non-woven fabric that satisfies the above-mentioned condition (D), in order to satisfy the above-mentioned conditions (A) to (C), and (E) and (F), the embossing roll 53 is as follows ( It is preferable to perform thermocompression bonding using an embossed roll satisfying 1) to (3). The details of the embossing roll will be described later.
(1) Area ratio of convex portion: 5% to 18%,
(2) Embossed aspect ratio (ratio expressed by the ratio of the depth from the top surface of the convex portion to the bottom surface of the concave portion with respect to the area on the top surface of the convex portion) ): 2.5 mm / mm 2 to 7.0 mm / mm 2 ,
(3) Rockwell hardness of base material: 35 HRC or more
[0042]
　Although an example of the method for producing the spunbonded nonwoven fabric of the present disclosure has been described with reference to FIG. 1, the present invention is not limited thereto. The spinning unit 11 may be provided with only one or two or more. Both the first extruder 31A and the second extruder 31B may be used, or only one of them may be used.
[0043]
　Further, the method for producing a spunbonded nonwoven fabric of the present disclosure may be produced by a manufacturing apparatus including a spinning portion 12 in which the cooling chamber shown in FIG. 2 has a closed structure. FIG. 2 is a schematic schematic view showing another example of an apparatus for manufacturing the spunbonded nonwoven fabric laminate of the present disclosure. FIG. 2 shows an apparatus in which the spinning portion 11 (spinning portion 11A and spinning portion 11B) in the spunbond manufacturing apparatus 100 shown in FIG. 1 is replaced with the spinning portion 12. That is, the device configuration other than the spinning unit 11 is the same as the manufacturing device shown in FIG. Further, the same components as those of the manufacturing apparatus shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
[0044]
　The spinning unit 12 cools the first extruder 32 that extrudes the thermoplastic polymer, the spinneret 34 that melt-spins the molten thermoplastic polymer, and the continuous fiber group 22 that is melt-spun from the spinneret 34. It has a chamber 38C, cooling air supply portions 38A and 38B for supplying the cooling air 36, and a drawing portion 38D for stretching the continuous fiber group 22.
[0045]
　In the spinning section 12, the thermoplastic polymer is extruded, and the molten thermoplastic polymer is introduced into the spinneret 34. Next, the molten thermoplastic polymer is melt-spun from the spinneret 34. The melt-spun continuous fiber group 22 is introduced into the cooling chamber 38C. The continuous fiber group 22 is cooled by the cooling air 36 supplied from either one or both of the cooling air supply unit 38A and the cooling air supply unit 38B. The cooled continuous fiber group 22 is introduced into the drawn portion 38D provided on the downstream side of the cooling chamber 38C. The extension portion 38D is provided in a bottleneck shape. By increasing the velocity of the cooling air in the bottleneck, the continuous fiber group 22 introduced into the drawn portion 38D is stretched. The stretched continuous fiber group 22 is dispersed and collected on the mobile collecting member 51. Then, the dispersed continuous fiber group 22 is efficiently collected on the moving collecting member 51 by the suction unit 39 provided in the lower part of the collecting surface of the moving collecting member 51, and the non-woven web 42 is formed. It is formed.
[0046]
　Although another example of the method for producing a spunbonded nonwoven fabric of the present disclosure has been described with reference to FIG. 2, the present invention is not limited thereto. The spinning unit 12 may be provided with only one or two or more. In FIG. 2, only one extruder 32 is provided, but two or more extruders 32 may be provided. Further, the continuous fiber group 20 melt-spun from the spinneret 33 shown in FIG. 1 and the continuous fiber group 22 melt-spun from the spinneret 34 shown in FIG. 2 may be a crimp continuous fiber group.
　In the following description, reference numerals will be omitted.
[0047]
　When the melt-spun continuous fiber group is a crimped continuous fiber group, it becomes easy to obtain a spunbonded non-woven fabric that is bulky and has excellent flexibility. Further, in the crimped continuous fiber group, the thermoplastic polymer contains the first thermoplastic polymer component and the second thermoplastic polymer component having a temperature higher than the melting point of the first thermoplastic polymer component by 5 ° C. or more. The first thermoplastic polymer component and the second thermoplastic polymer component may be composite melt-spun.
[0048]
　The non-woven web may be a laminated non-woven web having two or more layers, depending on the purpose. When the non-woven web has two layers, the first continuous fiber group is deposited on the mobile collecting member to form the first non-woven web, and then the second continuous fiber group is set to the first non-woven web. It may be deposited on a woven web to form a second non-woven web. When both the first non-woven web and the second non-woven web contain crimped fibers, it is easy to obtain a spunbonded non-woven fabric laminate satisfying the above-mentioned conditions (A) to (F). In the present disclosure, the "non-woven web" is a concept including not only a single-layer non-woven web but also a laminated non-woven web.
[0049]
　The temperature at which the non-woven web is thermocompression bonded may be set by the fibers contained in the non-woven web. When the fiber contained in the non-woven web is, for example, a polypropylene-based polymer, it may be in the range of 100 ° C. to 200 ° C. The linear pressure at the time of thermocompression bonding is, for example, 100 N / cm to 1500 N / cm. The crimping speed at the time of thermocompression bonding is, for example, 1 m / sec to 50 m / sec.
[0050]
　The embossed roll is provided with a convex portion and a concave portion, and it is important to satisfy the following (1) to (3).
(1) The area ratio of the convex portion is 5% to 18% (in the present specification, the area ratio of the convex portion may be referred to as "embossed area ratio").
(2) The embossed aspect ratio is 2.5 mm / mm 2 to 7.0 mm / mm 2 .
　The embossed aspect ratio is the ratio of the area on the top surface of the convex portion to the depth from the top surface of the convex portion to the bottom surface of the concave portion (depth from the top surface of the convex portion to the bottom surface of the concave portion / on the top surface of the convex portion). Area).
(3) Rockwell hardness of the base material: 35 HRC or more.
[0051]
　When the embossing roll satisfies the above (1) to (3), the area of ​​the top surface of the convex portion is small, the convex portion is high, and the convex portion has high hardness, and the embossing has an appropriate amount of convex portions. Indicates that it is a roll. That is, it means that the embossed roll is provided with an appropriate amount of elongated hard protrusions. When an embossed roll provided with an elongated convex portion is used in order to obtain a spunbonded nonwoven fabric satisfying the above-mentioned conditions (A) to (D), the convex portion is easily damaged and the productivity is inferior. Therefore, it is difficult to obtain the above-mentioned bulky and highly flexible spunbonded non-woven fabric. Therefore, performing thermocompression bonding with an embossed roll that satisfies all of the above (1) to (3) suppresses damage to the convex portion provided on the embossed roll, so that the above conditions (A) to (D) are satisfied. It is useful for efficiently producing a satisfactory spunbonded non-woven fabric.
[0052]
　In terms of obtaining a spunbonded nonwoven fabric that is bulky and has excellent flexibility, the preferable lower limit of the area ratio of the convex portion is 7% or more. Further, the preferable upper limit of the area ratio of the convex portion is 15% or less.
[0053]
　If the embossed aspect ratio is less than 2.5 mm / mm 2, it is difficult to obtain a spunbonded non-woven fabric that is bulky and has excellent flexibility. It is difficult to manufacture an embossed roll having an embossed aspect ratio of more than 7.0 mm / mm 2 . From the viewpoint of producing a spunbonded nonwoven fabric that is bulky, has excellent flexibility, and has low flexural rigidity, the preferable upper limit of the embossed aspect ratio is 6.0 mm / mm 2 or less, and the more preferable upper limit is 5.5 mm / mm. It is 2 or less. The preferable lower limit of the embossed aspect ratio is 3.0 mm / mm 2 or more, and the more preferable lower limit is 3.5 mm / mm 2 or more.
[0054]
　From the viewpoint of obtaining a spunbonded nonwoven fabric that is bulky, has excellent flexibility, and has low flexural rigidity, the Rockwell hardness of the base material of the embossed roll may be 35 HRC or more, preferably 35 HRC to 50 HRC. When the Rockwell hardness of the base material of the embossed roll is 35 HRC or more, a bulky and highly flexible spunbonded non-woven fabric can be efficiently manufactured.
[0055]
　The method for producing the embossed roll that satisfies all the above conditions (1) to (3) is not particularly limited, and the embossed roll is produced by a known method. For example, the surface of the base material satisfying the condition of (3) above is subjected to treatments such as engraving treatment, electroforming treatment, sandblasting treatment, electric discharge machining treatment, and etching treatment to obtain the above (1) and (2). There is a method of obtaining an embossed roll that satisfies the conditions.
[0056]
　From the viewpoint of obtaining a spunbonded non-woven fabric that is bulky, has excellent flexibility, and has low flexural rigidity, the embossed roll is a ratio of the depth to the bottom surface of the recess (to the bottom surface of the recess) to the distance between the convex portions adjacent to each other in the rotation direction. The depth / distance between adjacent convex portions in the rotation direction) is preferably 0.4 mm / mm to 1.0 mm / mm. A more preferable lower limit of this ratio is 0.5 mm / mm or more, and a more preferable upper limit is 0.8 mm / mm. The distance between the convex portions adjacent to each other in the rotation direction represents the distance between the centers (also referred to as the convex portion pitch) between the adjacent convex portions (see FIG. 3).
[0057]
　From the viewpoint of obtaining a spunbonded nonwoven fabric that is bulky, has excellent flexibility, and has low flexural rigidity, the convex portion pitch is preferably 0.5 mm to 3.0 mm. In the same respect, the area of ​​the top surface of the convex portion is preferably 0.1 mm 2 to 1.0 mm 2 .
[0058]
　The shape of the top surface of the convex portion of the embossed roll is not particularly limited. For example, it may be a round shape, an elliptical shape, a triangle, a quadrangle, a rhombus, or a polygon having a pentagon or more. Further, the shape may be surrounded by these shapes. Further, it may be a combination of these shapes.
[0059]
　Here, an example of the embossing roll of the present disclosure will be described with reference to the drawings. Hereinafter, an example of the embossing roll of the present disclosure will be described with reference to FIGS. 3 to 5, but the present invention is not limited thereto.
[0060]
　FIG. 3 is a schematic view showing an example of the embossed roll of the present disclosure. As shown in FIG. 3, the embossed roll 200 includes a large number of convex portions 201A and convex portions 201B. The convex portion 201A and the convex portion 201B are each provided with the same shape, and the top surfaces of the convex portion 201A and the convex portion 201B are elliptical shapes having the same shape, respectively. The embossed roll 200 is provided with a recess 203 between the adjacent convex portions 201A and the convex portions 201A, between the adjacent convex portions 201A and the convex portions 201B, and between the adjacent convex portions 201B and the convex portions 201B. Has been done. The convex portion group of the convex portion 201A is arranged so that the direction of the ellipse of the convex portion 201A is the same in the rotation direction of the embossing roll, and the ellipse direction is the same every other row. The convex portion group of the convex portion 201B is also provided in the same arrangement as the convex portion group of the convex portion 201A. The convex portion group of the convex portion 201A and the convex portion group of the convex portion 201B are provided in different directions for each row in the rotation direction.
[0061]
　As shown in FIG. 3, the embossed roll 200 is provided so that the convex portion group of the convex portion 201A has a distance P (that is, a convex portion pitch P) between the convex portions adjacent to each other in the rotation direction. As shown in FIG. 3, the distance P between the convex portions adjacent to each other in the rotation direction is the distance between the centers of the ellipse. The center of the ellipse represents the intersection of the shortest and longest diameters.
[0062]
　FIG. 4A is a cross-sectional view taken along the line AA of the convex portion of the embossed roll shown in FIG. Specifically, it shows a cross-sectional view taken along the line AA of the convex portion 201A of the embossed roll 200. FIG. 4B is a cross-sectional view taken along the line BB in the convex portion of the embossed roll shown in FIG. Specifically, it shows a cross-sectional view taken along the line BB of the convex portion 201B of the embossed roll 200. FIG. 5 is a perspective view of the convex portion of the embossed roll shown in FIG. 3 as viewed from the rotation direction. Specifically, it shows a perspective view of the convex portion 201A of the embossed roll 200 shown in FIG. 3 as viewed from the rotation direction. As shown in FIGS. 4A, 4B, and 5, each of the convex portion 201A and the convex portion 201B is provided with a taper angle. Further, as shown in FIGS. 4A, 4B, and 5, it has a depth t from the top surface of the convex portion 201A and the convex portion 201B to the bottom surface of the concave portion 203, and has an area S of the top surface.
[0063]
　In the embossed roll 200, the ratio (t / P) of the depth t to the bottom surface of the recess 203 with respect to the distance P between the convex portions 201A adjacent to each other in the rotation direction is preferably in the above range. Further, the embossed aspect ratio represented by the ratio (t / S) of the area S on the top surface of the convex portion 201A and the depth t from the top surface of the convex portion 201A to the bottom surface of the concave portion 203 is in the above range. Is preferable. The depth t from the top surface of the convex portion 201A to the bottom surface of the concave portion 203 is not particularly limited as long as the embossed aspect ratio satisfies the above range. Although the above description has been made on behalf of the convex portion 201A, the same applies to the convex portion 201B.
[0064]
　The embossed rolls of the present disclosure are suitable for thermocompression bonding a non-woven web for obtaining the spunbonded non-woven fabric and the spunbonded non-woven fabric laminate of the present disclosure. The embossed roll of the present disclosure is not limited to this, and can be applied to non-woven fabrics other than spunbonded non-woven fabrics and spunbonded non-woven fabric laminates as long as the non-woven fabrics can be thermocompression bonded.
Example
[0065]
　Hereinafter, the spunbonded nonwoven fabric of the present disclosure will be described with reference to Examples, but the spunbonded nonwoven fabric of the present disclosure is not limited to the following embodiments.
　In the following examples, "%" represents mass%.
[0066]
　Physical property values ​​and the like in Examples and Comparative Examples were measured by the following methods.
[0067]
(1) 　10 test pieces of 100 mm (flow direction: MD) × 100 mm (direction orthogonal to the flow direction: CD) were collected from the basis weight [g / m 2 ]
spunbonded non-woven fabric. The test pieces were collected at 10 locations in the CD direction. Then, in an environment of 20 ° C. and a relative humidity of 50% RH, the mass [g] of each of the collected test pieces was measured using a precision electronic balance (manufactured by Kensei Kogyo Co., Ltd.). The average value of the mass of each test piece was calculated. The calculated average value was converted into mass [g] per 1 m 2 , and the second decimal place was rounded off to obtain the basis weight [g / m 2 ] of each non-woven fabric sample .
[0068]
(2)
　Ten test pieces of 100 mm (MD) × 100 mm (CD) were collected from a thickness [mm] spunbonded non-woven fabric. The test piece was collected at the same place as the test piece for basis weight measurement. Next, the thickness [mm] of each of the collected test pieces was measured by the method described in JIS L 1096: 2010 using a load-type thickness gauge (manufactured by Ozaki Seisakusho Co., Ltd.). The average value of the thickness of each test piece was calculated, and the second decimal place was rounded off to obtain the thickness [mm] of each non-woven fabric sample.
[0069]
[Evaluation of flexibility]
(3) WC (compression work) [gf · cm / cm 2 ] Two
　150 mm (MD) × 150 mm (CD) test pieces were collected from the non-woven fabric. In addition, the collection place was set to two places over the CD direction. Next, the test piece is subjected to a compression tester KES-FB3-A manufactured by Kato Tech Co., Ltd. under a measurement condition of 20 ° C. and a relative humidity of 50% RH environment, and has a compressor (compression area 2 cm 2 circular plane). A compression test was performed at a compression deformation rate of 0.020 mm / sec and a maximum pressure of 50 gf / cm 2 using a steel pressure plate) , and WC [gf · cm / cm 2 ] was measured.
　The average value of the WC of each test piece was calculated, and the third decimal place was rounded off to obtain the WC [gf · cm / cm 2 ] of each non-woven fabric sample .
[0070]
[Evaluation of
bulkiness] (4) TO (pressure 0.5 gf / cm 2 Thickness of) -TM (pressure 50 gf / cm 2 Thickness in) [mm]
　A test piece of 150mm from nonwoven (MD) × 150mm (CD) Two points were collected. In addition, the collection place was set to two places over the CD direction. Next, the test piece is subjected to a compression tester KES-FB3-A manufactured by Kato Tech Co., Ltd. under a measurement condition of 20 ° C. and a relative humidity of 50% RH environment, and has a compressor (compression area 2 cm 2 circular plane). A compression test was performed at a compression deformation rate of 0.020 mm / sec and a maximum pressure of 50 gf / cm 2 using a steel pressure plate) , and TO [mm] and TM [mm] were measured.
　The average value of TO [mm] and TM [mm] of each test piece was calculated, and the third decimal place was rounded off to obtain TO [mm] and TM [mm] of each non-woven fabric sample. The TO-TM [mm] of each non-woven fabric sample was calculated.
[0071]
[Evaluation of flexural rigidity]
(5) Rigidity BR MD and Rigidity BR CD A
　cantilever test is carried out by the following method, and the flexural rigidity [mm] of the spunbonded non-woven fabric is measured to determine the flexural rigidity. evaluated. Specifically, the measurement was performed in accordance with JIS-L1096: 2010, 8.19.1 [Method A (45 ° cantilever method)].
　Five 2.5 cm (CD) x 15 cm (MD) test pieces in the vertical direction (MD) and 2.5 cm (MD) x 15 cm (CD) as test pieces in the horizontal direction (CD) from the spunbonded non-woven fabric. ) Was collected.
　The short side of the obtained test piece was placed on a smooth horizontal table having a slope of 45 degrees at one end in line with the scale baseline. Next, the test piece was gently slid in the direction of the slope by an appropriate method, and the position of the other end of the test piece when the center point of one end of the test piece came into contact with the slope was read by a scale.
　The rigidity is indicated by the length (mm) of movement of the test piece, and 5 pieces are measured in each of the vertical direction and the horizontal direction, and the average value of each in the vertical direction and the horizontal direction is obtained. Was defined as BR MD , and the lateral rigidity was defined as BR CD .
[0072]

(Lower layer) A
　side-by-side type crimped composite fiber (hereinafter referred to as "crimped fiber A") is obtained by performing composite melt spinning of the following first component and the following second component by a spunbond method. A lower non-woven web formed from was deposited on the mobile collection surface. In this side-by-side type crimped composite fiber, the mass ratio of the first component / the second component was 40/60, and the average fiber diameter was 15 μm. The basis weight of this non-woven web was 11.4 g / m 2 . 　-First
component of crimped fiber A-
Melting point 142 ° C., MFR 60 g / 10 minutes (measured at a temperature of 230 ° C. and a load of 2.16 kg according to ASTM D1238. The same shall apply hereinafter unless otherwise specified). A mixture of a copolymer and a propylene homopolymer having a melting point of 162 ° C. and an MFR of 3 g / 10 min (propylene / ethylene random copolymer / propylene homopolymer) of 96: 4. 　-Second
component of crimped fiber A-
Propylene / ethylene random copolymer with melting point 142 ° C., MFR 60 g / 10 min
[0073]
(Upper layer)
　An upper layer formed from side-by-side type crimped composite fibers (hereinafter referred to as "crimped fibers B") by performing composite melt spinning of the following first component and the following second component by a spunbond method. The non-woven web was deposited in-line on the underlying non-woven web to prepare a laminated non-woven web. In this side-by-side type crimped composite fiber, the mass ratio of the first component / the second component was 20/80, and the average fiber diameter was 15 μm. The basis weight of this non-woven web was 5.6 g / m 2 . 　-First
component of crimped fiber B-
Propylene homopolymer with melting point 162 ° C., MFR 60 g / 10 min-Propylene homopolymer of
crimped fiber B second component-
　Melting point 142 ° C., MFR 60 g / 10 min.
[0074]
　Next, the non-woven web having a laminated structure was heat-sealed with the following embossing roll under the following embossing conditions to obtain a spunbonded non-woven fabric laminate having a total basis weight of 17 g / m 2 . The area ratio of the crimped portion was 11%.
-Embossed roll-
　Embossed area ratio: 11%
　Embossed aspect ratio: 4.1 mm / mm 2
　Rockwell hardness of embossed base material: 37HRC
-Embossed conditions-
　Embossed temperature: 140 ° C.
　Embossed linear pressure: 784 N / cm
[0075]

　The lower basis weight in the spunbonded nonwoven fabric laminate 13.4 g / m 2 , 6.6 g of the upper layer having a basis weight / m 2 , the total basis weight 20 g / m 2 except for using, as in Example 1 A spunbonded non-woven fabric laminate was obtained.
[0076]

　spunbond a lower basis weight of the nonwoven fabric laminate 15.4 g / m 2 , 7.6 g / m the top layer having a basis weight of 2 , a total basis weight of 23 g / m 2 except for using, as in Example 1 A spunbonded non-woven fabric laminate was obtained.
[0077]
A
　spunbonded non-woven fabric laminate was obtained in the same manner as in Example 2 except that the following embossing roll was used as the embossing roll. 　-Embossed
roll-
　Embossed area ratio: 7%
　Embossed aspect ratio: 3.0
Rockwell hardness of embossed base material: 36HRC
[0078]
A
　spunbonded non-woven fabric laminate was obtained in the same manner as in Example 1 except that the following embossed roll was used as the embossed roll. 　-Embossed
roll-
　Embossed area ratio: 18%
Embossed aspect ratio: 1.9 mm / mm 2
　Rockwell hardness of embossed base material: 38HRC
[0079]
A
　spunbonded non-woven fabric laminate was obtained in the same manner as in Example 2 except that the following embossing roll was used as the embossing roll. 　-Embossed
roll-
　Embossed area ratio: 18%
Embossed aspect ratio: 1.9 mm / mm 2
　Rockwell hardness of embossed base material: 38HRC
[0080]

　The basis weight of the lower layer of the spunbonded non-woven fabric laminate is 20.0 g / m 2 , the basis weight of the upper layer is 10.0 g / m 2 , the total basis weight is 30 g / m 2 , and the embossed rolls are as follows. An embossed roll was used to obtain a spunbonded non-woven fabric laminate in the same manner as in Example 1 except that the following embossing conditions were met. The area ratio of the crimped portion was 11%. At this time, a spunbonded non-woven fabric laminate was obtained, but equipment failure occurred because the hardness of the embossed base material was not sufficient, and sufficient mass production stability could not be obtained.
-Embossed roll-
　Embossed area ratio: 11%
　Embossed aspect ratio: 4.1 mm / mm 2
　Rockwell hardness of embossed base material: 32HRC
-Embossed conditions-
　Embossed temperature: 140 ° C.
　Embossed linear pressure: 343 N / cm
[0081]
As
　the upper layer of the spunbonded non-woven fabric laminate, a non-woven web of non-crimp fibers (referred to as "non-crimp fiber A") using only the second component is used, and as the lower layer, only the second component is used. A spunbonded non-woven fabric laminate was obtained in the same manner as in Example 1 except that the non-crimped fibers (referred to as “non-crimped fibers B”) used were non-woven webs. 　-Component of
non-crimped fiber A-
Propylene / ethylene random copolymer with 　melting point 142 ° C., MFR 60 g / 10 min-
Component of non-crimped fiber B- Propylene / ethylene random copolymer with
melting point 142 ° C., MFR 60 g / 10 min
[0082]

　A non-woven web of non-crimped fibers (referred to as "non-crimped fibers A") using the following components is used as the upper layer of the spunbonded non-woven fabric laminate, and non-rolled using the following components as the lower layer. A spunbonded non-woven fabric laminate was obtained in the same manner as in Example 2 except that the non-woven web of crimped fibers (referred to as “non-crimped fibers B”) was used. 　-Component of
non-crimped fiber A-
Propylene / ethylene random copolymer with 　melting point 142 ° C., MFR 60 g / 10 min-
Component of non-crimped fiber B- Propylene / ethylene random copolymer with
melting point 142 ° C., MFR 60 g / 10 min
[0083]

　A non-woven web of non-crimped fibers (referred to as "non-crimped fibers C") using the following components is used as the upper layer of the spunbonded non-woven fabric laminate, and non-rolled using the following components as the lower layer. A spunbonded non-woven fabric laminate was obtained in the same manner as in Example 2 except that the non-woven web of crimped fibers (referred to as “non-crimped fibers D”) was used and the embossing conditions were as follows.
- non-crimped fibers C components -
　melting point 162 ℃, MFR60g / 10 min Propylene homopolymer
- component of the non-crimped fiber D -
　mp 162 ℃, MFR60g / 10 min Propylene homopolymer
- embossing conditions -
　Embossed Temperature : 160 ° C
　Embossed fiber pressure: 784 N / cm
[0084]

　The basis weight of the lower layer of the spunbonded non-woven fabric laminate is 10.0 g / m 2 , the basis weight of the upper layer is 10.0 g / m 2 , the total basis weight is 20 g / m 2, and the following components are further added as the upper layer. A spunbonded non-woven fabric laminate was obtained in the same manner as in Example 1 except that the non-woven web of the non-crimped fibers used (referred to as “non-crimped fibers A”) was used. 　-Component of
non-crimped fiber A-
Propylene / ethylene random copolymer with melting point 142 ° C., MFR 60 g / 10 min
[0085]
[table 1]

[0086]
　As shown in Table 1, in each embodiment, the basis weight W, the thickness t, the WC measured by the KES method, the TO-TM measured by the KES method, and the rigidity BR MD and the rigidity BR CD are disclosed in the present disclosure. It can be seen that it is within the range of the spunbonded non-woven fabric (nonwoven fabric laminate), is bulky, has excellent flexibility, and has low flexural rigidity.
[0087]

　The spunbonded non-woven fabrics of Comparative Examples 8 and 9 are commercial products which are made of non-crimped fibers and have obtained bulkiness by using a processing device or the like on the spunbonded non-woven fabric after embossing. The results are shown in Table 2.
[0088]
[Table 2]

[0089]
　As can be seen from Table 2, the spunbonded non-woven fabrics subjected to the secondary processing shown in Comparative Examples 8 and 9 have high WC and TO-TM values, and therefore have good bulkiness and flexibility. However, it can be seen that the rigidity and softness are higher than those in the examples, and the bending rigidity is large. Further, as in Comparative Example 8, when the bulkiness and flexibility are increased, the rigidity and softness are greatly increased, and there is a tendency that the desired small flexural rigidity cannot be obtained.
　Therefore, as shown in Comparative Examples 8 and 9, in the conventional spunbonded non-woven fabric, good bulkiness and flexibility and small flexural rigidity are in a trade-off relationship, and it is difficult to achieve both of them.
　On the other hand, in the spunbonded non-woven fabric of this example, both good bulkiness and flexibility and small flexural rigidity could be achieved at the same time.
[0090]
　The reference numerals attached to the drawings are as follows.
　53 200 embossed roll, 201A 201B convex part, 203 concave part, 60 spunbonded non-woven fabric laminate
[0091]
　The entire disclosure of PCT / JP 2019/002536 filed on January 25, 2019 is incorporated herein by reference in its entirety.
　All documents, patent applications and technical standards described herein are to the same extent as if the individual documents, patent applications and technical standards were specifically and individually stated to be incorporated by reference. Incorporated by reference in the book.

WE CLAIM

[Claim 1]Including fibers of thermoplastic polymer, thickness t, compression work amount WC measured by compression test by KES method, thickness TO measured by compression test by KES method at pressure 0.5 gf / cm 2 , compression test by KES method Thickness TM at measured pressure 50 gf / cm 2, grain W, and longitudinal (MD) stiffness BR MD and lateral (MD) measured according to the 45 ° cantilever method described in JIS-L1096: 2010. A spunbonded non-woven fabric in which the rigidity BR CD of CD ) satisfies the following conditions (A) to (F).
　(A): t ≧ 0.30 mm
　(B): WC ≧ 0.22 gf · cm / cm 2
　(C): TO-TM ≧ 0.25 mm
　(D): W ≦ 30 g / m 2
　(E): BR MD ≤40 mm
　(F): BR CD ≤25 mm
[Claim 2]
　The spunbonded nonwoven fabric according to claim 1, which has a crimped portion and a non-crimped portion.
[Claim 3]
　The spunbonded nonwoven fabric according to claim 2, wherein the area ratio of the pressure-bonded portion is 5% to 18%.
[Claim 4]
　The spunbonded nonwoven fabric according to any one of claims 1 to 3, wherein the fibers include crimped fibers.
[Claim 5]
　The spunbonded nonwoven fabric according to any one of claims 1 to 4, wherein the thermoplastic polymer contains an olefin polymer.
[Claim 6]
　The spunbonded nonwoven fabric according to claim 5, wherein the olefin-based polymer contains a propylene-based polymer.
[Claim 7]
　The spunbonded nonwoven fabric according to any one of claims 1 to 6, wherein the average fiber diameter of the fibers is 5 μm to 20 μm.
[Claim 8]
　The spunbonded non-woven fabric according to any one of claims 1 to 7, which is used as a sanitary material.
[Claim 9]
　The spunbonded non-woven fabric according to any one of claims 1 to 8, which is a laminated body of spunbonded non-woven fabric.
[Claim 10]
　That the thermoplastic polymer is melt-spun to form a continuous fiber group,
　it is deposited are formed the continuous fiber groups on a moving collecting member to form a nonwoven web,
　the formed the nonwoven web , The convex portion and the concave portion are provided, the area ratio of the convex portion is 5% to 18%, and the ratio of the depth from the top surface of the convex portion to the bottom surface of the concave portion with respect to the area on the top surface of the convex portion. in embossed aspect ratio represented is, 2.5 mm / mm 2 ~ 7.0 mm / mm 2 is, by performing the thermocompression bonding, by embossing roll Rockwell hardness of the base material is not less than 35HRC
　having the claim The method for producing a spunbonded nonwoven fabric according to any one of claims 1 to 9.
[Claim 11]
　The method for producing a spunbonded nonwoven fabric according to claim 10, wherein the Rockwell hardness of the base material of the embossed roll is 35 HRC to 50 HRC.
[Claim 12]
　The method for producing a spunbonded nonwoven fabric according to claim 10 or 11, wherein the ratio of the depth to the distance between the convex portions adjacent to each other in the rotation direction is 0.4 mm / mm to 1.0 mm / mm.
[Claim 13]
　The method for producing a spunbonded nonwoven fabric according to any one of claims 10 to 12, wherein the non-woven web is at least two layers of non-woven web.
[Claim 14]
　An embossed roll for thermocompression bonding a non-woven web, the
　convex portion and the concave portion are provided, the area ratio of the convex portion is 5% to 18%, and the convex portion with respect to the area on the top surface of the convex portion. The embossed aspect ratio represented by the ratio of the depths from the top surface to the bottom surface of the recess is 2.5 mm / mm 2 to 7.0 mm / mm 2 , and the Rockwell hardness of the base metal is 35 HRC or more. Embossed roll.
[Claim 15]
　The embossed roll according to claim 14, wherein the rockwell hardness of the base material of the embossed roll is 35 HRC to 50 HRC.
[Claim 16]
　The embossing roll according to claim 14 or 15, wherein the ratio of the depth to the distance between the convex portions adjacent to each other in the rotation direction is 0.4 mm / mm to 1.0 mm / mm.