TW202408647A - Nonwoven fabric layered body - Google Patents

Abstract

Provided is a nonwoven fabric laminate comprising: a nonwoven fabric layer A containing composite fibers that include a region A containing a propylene/[alpha]-olefin random copolymer and include a region B containing an ethylene-based polymer, the composite fibers being of a side-by-side type or an eccentric core-sheath type, the proportion of the region A to the region B on a mass basis being 70:30 to 10:90 (region A : region B), and the density of the region B being 900 kg/m3 to 945 kg/m3; and a nonwoven fabric layer B containing fibers that include a polymer (I), which is a random copolymer of propylene and at least one selected from ethylene and 4-20C [alpha]-olefins.

Description

Nonwoven fabric laminated body

The present invention relates to a nonwoven fabric laminated body.

Nonwoven fabrics made of polyolefin are used in various disposable articles including sanitary materials such as diapers and sanitary napkins because they have excellent air permeability and other properties.

As nonwoven fabrics, in addition to nonwoven fabrics containing fibers composed of a single component, nonwoven fabrics containing fibers having a plurality of regions composed of different resins in one fiber, that is, composite fibers, are known.

As a nonwoven fabric used in sanitary materials, for example, Patent Document 1 describes a bulky composite long-fiber nonwoven fabric, which contains a polypropylene resin as a first component and a polyethylene resin or a mixture of two polyethylene resins as a second component. The composite long-fiber nonwoven fabric can be preferably used for sanitary materials and is considered to have cushioning softness, bending softness, and barrier properties. [Prior art document] [Patent document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2018-145544

[Problem to be solved by the invention] The present inventors conducted research and found that the composite long fiber nonwoven fabric described in Patent Document 1 has concerns about increased necking during processing, which poses a problem in stable production during high-speed molding. Furthermore, in this disclosure, the so-called necking refers to, for example, when the nonwoven fabric is stretched in the machine direction (MD) direction (the flow direction of the fiber), the cross direction (CD) direction (with the flow direction of the fiber) of the nonwoven fabric. The length in the direction orthogonal to the flow direction of the fiber becomes shorter due to the expansion and contraction of the fiber.

An object of this disclosure is to provide a nonwoven fabric laminate excellent in flexibility and necking resistance. [Means to solve the problem]

This disclosure is about the following forms. <1> A nonwoven fabric laminate, including: a nonwoven fabric layer A, including a composite fiber containing a region A containing a propylene-α-olefin random copolymer and a region B containing an ethylene-based polymer, the composite fiber It is a parallel type or an eccentric core-sheath type. The ratio of the area A to the area B is 70:30 to 10:90 on a mass basis (area A: area B). The density of the area B is 900 kg. /m ³ ~ 945 kg/m ³ ; and non-woven fabric layer B, including fibers containing polymer (I), where the polymer (I) is propylene and an α-olefin selected from ethylene and a carbon number of 4 to 20. At least one random copolymer. <2> The nonwoven fabric laminate according to <1>, wherein both the melting point of the propylene-α-olefin random copolymer and the melting point of the polymer (I) are 155° C. or lower. <3> The nonwoven fabric laminate according to <1> or <2>, wherein the region A of the composite fiber is exposed. <4> The nonwoven fabric layered body according to any one of <1> to <3>, wherein the nonwoven fabric layer A and the nonwoven fabric layer B are thermally welded by embossing. <5> The nonwoven fabric laminate according to <4>, wherein the embossing area ratio is 8% to 22%. <6> The nonwoven fabric laminate according to any one of <1> to <5>, wherein the ethylene-based polymer contains an ethylene-α-olefin copolymer. <7> The nonwoven fabric laminate according to <6>, wherein the ethylene-α-olefin copolymer contains an ethylene-1-butene copolymer and an ethylene-4-methyl-1-pentene copolymer. at least one of the groups formed. <8> The nonwoven fabric laminate according to any one of <1> to <7>, wherein the vinyl polymer has a melt flow rate (MFR) (American Society for Testing and Materials for Testing Materials, ASTM) D-1238, 190°C, 2.16 kg load) is 20 g/10 minutes ~ 60 g/10 minutes. <9> The nonwoven fabric laminate according to any one of <1> to <8>, wherein the density of the region B is 915 kg/m ³ to 940 kg/m ³ . <10> The nonwoven fabric laminate according to any one of <1> to <9>, wherein the ratio of the region A to the region B is 65:35 to 35:65 on a mass basis (region A : Area B). <11> The nonwoven fabric laminate according to any one of <1> to <10>, wherein the propylene-α-olefin random copolymer and the polymer (I) are both random copolymers of propylene and ethylene. regular copolymer. <12> The nonwoven fabric laminate according to any one of <1> to <11>, wherein both the nonwoven fabric layer A and the nonwoven fabric layer B are spunbonded nonwoven fabrics. <13> The nonwoven fabric laminated body according to any one of <1> to <12>, wherein the content of the polymer (I) is greater than the total amount of the fibers contained in the nonwoven fabric layer B. It is more than 70% by mass. <14> The nonwoven fabric laminate according to any one of <1> to <13>, wherein the ratio of the basis weight A of the nonwoven fabric layer A to the basis weight B of the nonwoven fabric layer B is 80: 20～40:60 (weight per unit area A: weight per unit area B). <15> The nonwoven fabric laminate according to any one of <1> to <14>, containing a hydrophilic agent. <16> The nonwoven fabric laminate according to any one of <1> to <15>, wherein the tensile strength at 5% extension in the MD direction is 2.5 N/25 mm to 8.0 N/25 mm. [Effects of the invention]

Through this disclosure, a spunbond nonwoven fabric excellent in softness and necking resistance can be provided.

Hereinafter, embodiments of the present disclosure will be described. These descriptions and examples illustrate the embodiments and do not limit the scope of the embodiments.

In this disclosure, the numerical range expressed using "～" means a range including the numerical values described before and after "～" as the lower limit and the upper limit. In this disclosure, the term "step" not only refers to an independent step, but also includes it even if it cannot be clearly distinguished from other steps, as long as the purpose of the step is achieved. In the numerical ranges described in stages in this disclosure, the upper limit or lower limit described in one numerical range may be replaced with the upper limit or lower limit of the numerical range described in other stages. In addition, in the numerical range described in this disclosure, the upper limit value or the lower limit value of this numerical range may be replaced with the value shown in the Example. In this disclosure, each ingredient may include a variety of consistent substances. When the amount of each component in the composition is mentioned in this disclosure, or when there are multiple substances corresponding to each component in the composition, unless otherwise specified, it refers to the total of the multiple substances present in the composition. quantity. In this disclosure, the MD (Machine Direction) direction refers to the advancing direction of the nonwoven fabric sheet in the nonwoven fabric manufacturing device. The CD (Cross Direction) direction refers to the direction perpendicular to the MD direction and parallel to the main surface (the surface orthogonal to the thickness direction of the nonwoven fabric). In this disclosure, the term "layer" includes not only the case where the layer is formed in the entire region when the region where the layer exists is observed, but also the case where the layer is formed in only a part of the region. The monomers used as raw materials for the polymers used in the present disclosure can be derived from biomass.

[Nonwoven fabric laminated body] The nonwoven fabric laminated body of the present disclosure includes a nonwoven fabric layer A including a composite fiber containing a region A containing a propylene-α-olefin random copolymer and a region B containing an ethylene-based polymer. The composite fiber is a side-by-side type or an eccentric core-sheath type. The ratio of the area A to the area B is 70:30 to 10:90 on a mass basis (area A: area B). The density of the area B is is 900 kg/m ³ to 945 kg/m ³ ; and the non-woven fabric layer B includes fibers containing polymer (I), and the polymer (I) is propylene and α selected from ethylene and carbon number 4 to 20. - Random copolymers of at least one olefin.

In the nonwoven fabric laminated body of this disclosure, by combining the nonwoven fabric layer A and the nonwoven fabric layer B, flexibility and necking resistance are excellent. The reason for this is not yet clear, but is presumed to be as follows. In addition, the following speculation does not limitly interpret the nonwoven fabric laminated body of this disclosure, but is demonstrated as an example.

The nonwoven fabric including the nonwoven fabric layer A containing the composite fiber and not including the nonwoven fabric layer B tends to have poor necking resistance. On the other hand, the nonwoven fabric layer B containing the polymer (I) can improve the strength of the nonwoven fabric, but may become a major factor that reduces the softness of the nonwoven fabric.

The nonwoven fabric laminate of the present disclosure has an excellent balance between strength and softness by including both the nonwoven fabric layer A and the nonwoven fabric layer B. It is presumed that by integrating the nonwoven fabric layer A and the nonwoven fabric layer B by embossing, when the obtained nonwoven fabric laminate is stretched in the transverse direction, the shrinkage in the direction perpendicular to the stretching direction is suppressed, and the shrinkage resistance is excellent.

[Nonwoven fabric layer A] The nonwoven fabric laminate of the present disclosure includes a nonwoven fabric layer A containing composite fibers. The composite fiber is a side-by-side or eccentric core-sheath type fiber including a region A containing a propylene-α-olefin random copolymer and a region B containing an ethylene polymer. Furthermore, the ratio of area A to area B is 70:30 to 10:90 on a mass basis (area A: area B), and the density of area B is 900 kg/m ³ to 945 kg/m ³ .

The cross section of the side-by-side type composite fiber is shown in FIG. 1 . In FIG. 1 , area A and area B form a left side and a right side respectively, and the boundary between area A and area B is substantially linear. The cross-section of the side-by-side composite fiber is not limited to this. For example, the boundary between the region A and the region B may be formed on the left or right. Area A and Area B can also be reversed left and right.

The cross-sections of the eccentric core-sheath type composite fiber are shown in (a) and (b) of FIG. 2 . The eccentric core-sheath type composite fiber in FIG. 2( a ) includes a core 3 formed further inside, and a sheath 4 formed to surround the core 3 . The eccentric core-sheath type composite fiber in FIG. 2(b) has the core 3 further to the left than the eccentric core-sheath type composite fiber in FIG. 2(a), whereby a part of the core 3 is exposed. form. The core may be region A or region B. The sheath can be area A or area B. For the eccentric core-sheath type composite fiber, it is preferable that the core is in region A and the sheath is in region B. More preferably, the core is in region A and is exposed, and the sheath is in region B.

In the composite fiber, it is preferable that the area A is exposed. More specifically, the composite fiber is preferably a side-by-side type or an eccentric core-sheath type composite fiber in which the region A is exposed. According to this form, since it is easy to apply embossing appropriately, the strength tends to be excellent.

The ratio of region A to region B in the composite fiber is 70:30 to 10:90 (region A: region B) by mass. From the viewpoint of both softness and neck shrinkage resistance, the ratio of region A to region B is preferably 65:35 to 35:65, and more preferably 65:35 to 55:45.

From the viewpoint of both softness and necking resistance, the average fiber diameter of the composite fiber is preferably 10 μm to 40 μm, more preferably 10 μm to 25 μm, further preferably 12 μm to 20 μm, and particularly preferably 15 μm to 18 μm.

(Area A) Region A contains propylene-alpha-olefin random copolymer.

The content of the structural unit derived from propylene in the propylene-α-olefin random copolymer is 50% by mass or more and less than 100% by mass. From the viewpoint of both flexibility and necking resistance, it is preferably 70% by mass to 99% by mass, and more preferably 80% by mass to 98% by mass. The content of the structural unit derived from α-olefin in the propylene-α-olefin random copolymer exceeds 0% by mass and is 50% by mass or less, and is preferably 1% by mass to 30% by mass, and more preferably 2% by mass to 20% by mass.

The α-olefin in the propylene-α-olefin random copolymer is not particularly limited as long as it is an α-olefin other than propylene. Examples of the α-olefin include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, and 4-methyl-1-hexene. Among these, ethylene is preferred as the α-olefin from the viewpoint of further improving the flexibility.

The content of the propylene-α-olefin random copolymer in region A is preferably 10% by mass to 100% by mass, more preferably 50% by mass to 100% by mass, further preferably 90% by mass to 100% by mass, and particularly preferably 99% by mass to 100% by mass. When the content of the propylene-α-olefin random copolymer in region A is within the above range, the necking resistance tends to be excellent.

As the propylene-α-olefin random copolymer, specifically, propylene-1-butene random copolymer, propylene-ethylene random copolymer, propylene-ethylene-1-butene random copolymer, etc. can be cited as preferred examples. From the perspective of both softness and necking resistance, a random copolymer of propylene and ethylene is more preferred. Furthermore, the monomer as the raw material of the propylene-α-olefin random copolymer can also be derived from biomass.

From the viewpoint of further improving the strength, region A may further include a propylene homopolymer or a plurality of propylene-α-olefin random copolymers. When the region A contains a propylene homopolymer, the necking resistance tends to be excellent.

The content of the propylene homopolymer in region A is preferably 1 mass % to 90 mass %, more preferably 50 mass % to 80 mass %. When the content of the propylene homopolymer in region A is within the above range, there is a tendency for excellent necking resistance. Furthermore, when region A contains the propylene homopolymer within the above range, the content of the propylene-α-olefin random copolymer is preferably such that the total of the propylene-α-olefin random copolymer and the propylene homopolymer reaches 100 mass %.

The content of the structural unit derived from propylene in the entire resin components included in the region A is preferably 90 mass % to 99.5 mass %, more preferably 93 mass % to 99 mass %, and further preferably 95 mass % to 98 mass %. When the content of the structural unit derived from propylene is within the above range, the necking resistance tends to be excellent.

The melting point of the propylene-α-olefin random copolymer is preferably 155° C. or less. When region A contains only the propylene-α-olefin random copolymer as the resin component, the melting point of the propylene-α-olefin random copolymer is preferably 125° C. to 155° C. When the melting point is within the above range, the necking resistance tends to be excellent.

Regarding the propylene-α-olefin random copolymer, the melt flow rate (MFR, measurement conditions: 230°C, load 2.16 kg) measured according to the method of ASTM standard D-1238 is preferably 10 g/10 minutes to 100 g/10 minutes, preferably 15 g/10 minutes to 80 g/10 minutes. When the MFR of the propylene-α-olefin random copolymer is within the above range, the flexibility tends to be excellent.

(Region B) Region B contains a vinyl polymer. The density of area B is 900 kg/m ³ to 945 kg/m ³ . The density of area B is preferably 910 kg/m ³ to 940 kg/m ³ , more preferably 915 kg/m ³ to 940 kg/m ³ , and further preferably 920 kg/m ³ to 940 kg/m ³ . When the density is within the above range, there is a tendency to be excellent in both flexibility and necking resistance. The density of region B can be adjusted by changing the density of the resin constituting region B. The melting point of the ethylene-based polymer is approximately 95°C to 125°C.

The content of the structural unit derived from ethylene in the ethylene polymer is 50% by mass or more, preferably 70% by mass to 99.8% by mass, and more preferably 90% by mass to 99% by mass. The content of other structural units in the ethylene polymer is 0% by mass to 50% by mass, preferably 0.2% by mass to 30% by mass, and more preferably 1% by mass to 10% by mass. If the content of the structural unit derived from ethylene and/or other structural units in the ethylene polymer is within the range, there is a tendency to be excellent in terms of both softness and necking resistance.

Examples of monomers constituting other structural units include α-olefins. The α-olefin is not particularly limited as long as it is other than ethylene, and examples thereof include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 3-methyl-1-butene, 3- Methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, etc. Among these, from the viewpoint of both flexibility and necking resistance, 1-butene and 4-methyl-1-pentene are preferred as α-olefins.

The ethylene-based polymer preferably contains an ethylene-α-olefin copolymer. In addition, the ethylene-α-olefin copolymer is preferably at least one selected from the group consisting of ethylene-1-butene copolymer and ethylene-4-methyl-1-pentene copolymer, and more preferably ethylene -4-Methyl-1-pentene copolymer. When the ethylene-based polymer is in the above-mentioned form, it tends to be excellent in both flexibility and necking resistance. Furthermore, the monomer used as the raw material of the vinyl polymer may be derived from biomass.

The MFR (ASTM D-1238, 190°C, 2.16 kg load) of the ethylene polymer is preferably 10 g/10 min to 100 g/10 min, more preferably 15 g/10 min to 60 g/10 min, and further preferably 20 g/10 min to 60 g/10 min. If the MFR of the ethylene polymer is within the above range, it tends to be excellent in terms of both softness and necking resistance.

The content rate of the ethylene-based polymer in the region B is preferably 10 mass% to 100 mass%, more preferably 50 mass% to 100 mass%, further preferably 90 mass% to 100 mass%, and particularly preferably 99 mass% ~100 mass%. When the content rate of the ethylene-based polymer in the region B is within the above range, there is a tendency to be excellent in both flexibility and necking resistance.

From the viewpoint of balancing strength and necking resistance, the weight per unit area of the nonwoven fabric layer A is preferably 5 g/m ² to 20 g/m ² , and more preferably 6 g/m ² to 16 g/m ² . More preferably, it is 8 g/m ² to 12 g/m ² .

From the viewpoint of balancing strength and necking resistance, the thickness of the nonwoven fabric layer A is preferably 0.05 mm to 2.00 mm, more preferably 0.10 mm to 1.00 mm. In the present disclosure, the thickness of the nonwoven fabric layer can be measured as follows. Collect 10 test pieces of 100 mm (MD) × 100 mm (CD) from the nonwoven fabric constituting each layer. Next, the thickness of each collected test piece was measured with a load of 0.3 kPa using a load-type thickness gauge (manufactured by Ozaki Seisakusho Co., Ltd.) in accordance with the method described in Japanese Industrial Standards (JIS) L 1096:2010 [ mm], the average value of the thickness of each test piece is rounded to the third decimal place as the thickness of the nonwoven fabric layer [mm].

The type of nonwoven layer A is not particularly limited, and examples include: spunbond nonwoven fabric, meltblown nonwoven fabric, carded hot air nonwoven fabric, air laid nonwoven fabric, needle punched spunbond nonwoven fabric, wet nonwoven fabric, dry pulp nonwoven fabric, flash steamed nonwoven fabric Spun non-woven fabrics, split fiber non-woven fabrics, etc. The non-woven fabric layer A preferably includes spun-bonded non-woven fabric, and more preferably is spun-bonded non-woven fabric. By reducing the fiber diameter, spunbond nonwoven fabrics are denser and more uniform than other nonwoven fabrics with the same weight per unit area. Therefore, spunbond nonwoven fabrics can achieve both softness and necking resistance. The non-woven fabric layer A may be one layer or more than two layers. When there are two or more nonwoven fabric layers A, the composite fibers contained in each layer may be the same or different. When there are two or more nonwoven fabric layers A, a plurality of nonwoven fabric layers A may be continuously laminated in the thickness direction, or another layer (for example, a nonwoven fabric layer) may be laminated between the plurality of nonwoven fabric layers A in the thickness direction. B).

The method of forming a nonwoven fabric laminated body by laminating the nonwoven fabric layer A, the nonwoven fabric layer B described below, and other layers as necessary is not particularly limited. For example, heat fusion methods such as heat embossing and ultrasonic welding, mechanical entanglement methods such as needle punching and water jet, and methods using adhesives such as hot melt adhesives and urethane adhesives can be used. , extrusion lamination and other various methods.

[Nonwoven fabric layer B] The nonwoven fabric layer body disclosed herein includes a nonwoven fabric layer B, wherein the nonwoven fabric layer B comprises fibers containing a polymer (I), wherein the polymer (I) is a random copolymer of propylene and at least one selected from ethylene and an α-olefin having a carbon number of 4 to 20.

Polymer (I) is a random copolymer of propylene and at least one selected from ethylene and an α-olefin with a carbon number of 4 to 20, and contains a structural unit derived from propylene, and a structural unit derived from ethylene and a carbon number selected from the group consisting of It is a structural unit of at least one α-olefin among α-olefins having 4 to 20 α-olefins (hereinafter, also referred to as “structural unit derived from α-olefin”). Since the polymer (I) is a random copolymer, it tends to be excellent in both flexibility and necking resistance.

As polymer (I), there is no particular limitation as long as it is a random copolymer containing the above structural units. As structural units derived from α-olefins, there can be listed: structural units derived from ethylene; structural units derived from α-olefins with 4 to 20 carbon atoms such as 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 4-methyl-1-pentene, etc. Among them, structural units derived from ethylene and structural units derived from α-olefins with 4 to 8 carbon atoms are preferred from the perspective of both flexibility and necking resistance. The structural units derived from α-olefins contained in polymer (I) may be only one type or two or more types.

Specific examples of the polymer (I) include a propylene-1-butene random copolymer, a propylene-ethylene random copolymer, a propylene-ethylene-1-butene random copolymer, and the like. From the viewpoint of balancing softness and necking resistance, the polymer (I) is preferably a random copolymer of propylene and ethylene, and the polymer (I) and the propylene-α-olefin included in the region A are random copolymers. More preferably, it is a random copolymer of propylene and ethylene. Furthermore, the monomers used as raw materials for the polymer (I) may also be derived from biomass.

From the viewpoint of achieving both flexibility and necking resistance, the proportion of structural units derived from propylene in all structural units contained in the polymer (I) is preferably 80 to 90 mass%, more preferably 90 to 99.5 mass%, further preferably 93 to 99 mass%, and particularly preferably 95 to 98 mass%.

The melting point of the polymer (I) is preferably 155°C or lower. The melting point of the polymer (I) is defined as the top of the peak after holding at -40°C for 5 minutes in a nitrogen atmosphere using a differential scanning calorimeter (DSC). The peak observed at the highest temperature side of the melting endotherm curve obtained by heating at 10°C/min. Specifically, it can be obtained as the peak top of the following peak by using a differential scanning calorimeter (DSC-7, manufactured by PerkinElmer) in a nitrogen atmosphere. The peak observed at the highest temperature side of the melting endotherm curve obtained by holding 5 mg of the sample at -40°C for 5 minutes and then increasing the temperature at 10°C/min. From the viewpoint of balancing flexibility and necking resistance, the temperature of the polymer (I) is more preferably 120°C to 155°C, and further preferably 125°C to 150°C.

From the perspective of both flexibility and necking resistance, the melting point of the propylene-α-olefin random copolymer contained in the region A and the melting point of the polymer (I) are preferably 155°C or less, more preferably 150°C or less, and further preferably 145°C or less. The lower limits of the melting points of the propylene-α-olefin random copolymer contained in the region A and the melting points of the polymer (I) are not particularly limited and may be 100°C or more.

From the viewpoint of balancing flexibility and necking resistance, the absolute value of the difference between the melting point of the propylene-α-olefin random copolymer contained in the region A and the melting point of the polymer (I) may be 0° C. to 40℃, it can also be 0℃～25℃, it can also be 0℃～10℃.

In terms of obtaining good spinnability, the melt flow rate (MFR, measurement conditions: 230°C, load 2.16 kg) measured by the method according to ASTM specification D-1238 of the polymer (I) is generally relatively high. It is preferably in the range of 1 g/10 minutes to 100 g/10 minutes, more preferably in the range of 5 g/10 minutes to 100 g/10 minutes, and still more preferably in the range of 30 g/10 minutes to 70 g/ Within 10 minutes.

From the viewpoint of softness, the content of polymer (I) is preferably 10% by mass or more, more preferably 50% by mass or more, further preferably 70% by mass or more, and particularly preferably 80% by mass or more, relative to the total amount of fibers contained in the nonwoven fabric layer B. From the viewpoint of strength, the content of polymer (I) may be 100% by mass or less, 99% by mass or less, or 90% by mass or less, relative to the total amount of fibers contained in the nonwoven fabric layer B. The content of polymer (I) may be 50% by mass to 100% by mass, 80% by mass to 100% by mass, 90% by mass to 100% by mass, or 100% by mass, relative to the total amount of fibers contained in the nonwoven fabric layer B.

From the viewpoint of improving strength, the nonwoven fabric layer B may contain a propylene homopolymer, or may contain a plurality of polymers including propylene-α-olefin random copolymers having different melting points as polymer (I). When the nonwoven fabric layer B contains a propylene homopolymer, from the viewpoint of strength, the content of the propylene homopolymer in the nonwoven fabric layer B is preferably 1% by mass or more, more preferably 10% by mass or more, relative to the total amount of fibers contained in the nonwoven fabric layer B. When the nonwoven fabric layer B contains a propylene homopolymer, the content of the propylene homopolymer in the nonwoven fabric layer B is preferably 90% by mass or less, more preferably 50% by mass or less, further preferably 30% by mass or less, and particularly preferably 20% by mass or less. Furthermore, when the nonwoven fabric layer B contains a propylene homopolymer within the above range, the content of the polymer (I) is preferably such that the total of the polymer (I) and the propylene homopolymer reaches 100% by mass.

From the viewpoint of balancing softness and necking resistance, the thickness of the nonwoven fabric layer B is preferably 0.05 mm to 2.00 mm, more preferably 0.10 mm to 1.00 mm.

In the nonwoven fabric layer B, the average fiber diameter of the fibers is preferably 10 μm to 30 μm, more preferably 11 μm to 25 μm, and further preferably 12 μm to 20 μm. When the average fiber diameter of the fibers is within the above range, both softness and neck shrinkage resistance tend to be achieved.

From the viewpoint of balancing softness and necking resistance, the weight per unit area of the nonwoven fabric layer B is preferably 4 g/m ² to 20 g/m ² , more preferably 5 g/m ² to 15 g/m ² , and more preferably 8 g/m ² ~ 12 g/m ² .

The type of the nonwoven fabric layer B is not particularly limited, and examples thereof include: spunbond nonwoven fabric, meltblown nonwoven fabric, carded hot air nonwoven fabric, airflow-laid nonwoven fabric, needle-punched spunbond nonwoven fabric, wet nonwoven fabric, dry pulp nonwoven fabric, flash-spun filament nonwoven fabric, open-fiber nonwoven fabric, etc. The nonwoven fabric layer B preferably includes a spunbond nonwoven fabric, and more preferably a spunbond nonwoven fabric. Spunbond nonwoven fabrics are denser and more uniform than other nonwoven fabrics of the same weight per unit area by reducing the fiber diameter. Therefore, spunbonded nonwoven fabrics can take into account both softness and necking resistance. The nonwoven fabric layer B can be one layer or two or more layers. When the nonwoven fabric layer B is two or more layers, the composite fibers contained in each layer can be the same or different. When the nonwoven fabric layer B is two or more layers, multiple nonwoven fabric layers B can be continuously laminated in the thickness direction, and other layers (for example, nonwoven fabric layer A) can be laminated between multiple nonwoven fabric layers B in the thickness direction.

The type of the nonwoven fabric layer A and the type of the nonwoven fabric layer B may be the same or different. From the perspective of both softness and neck shrinkage resistance, the nonwoven fabric layer A and the nonwoven fabric layer B preferably both include spunbond nonwoven fabrics, and more preferably both are spunbond nonwoven fabrics.

(Hydrophilic agent) The nonwoven fabric laminate of the present disclosure may further contain a hydrophilic agent. If the nonwoven fabric laminate contains a hydrophilic agent, the hydrophilicity tends to increase. The hydrophilic agent only needs to be contained in at least one layer selected from the group consisting of the nonwoven fabric layer A and the nonwoven fabric layer B, and may be contained in both the nonwoven fabric layer A and the nonwoven fabric layer B. The hydrophilizing agent may be included in the composite fibers included in the nonwoven fabric layer A or in the fibers included in the nonwoven fabric layer B. In addition, it may be included in the interior of the composite fiber or in the interior of the fiber, or may be attached to the surface of the composite fiber or the surface of the fiber.

Regarding the hydrophilic agent, if further classified, it can be classified into a penetrant and a wetting agent. The nonwoven fabric layer disclosed herein may contain both a penetrant and a wetting agent, or may contain no penetrant but a wetting agent. From the perspective of excellent hydrophilicity, the hydrophilic agent preferably contains both a penetrant and a wetting agent.

The hydrophilic agent preferably includes at least one of a sulfonate and a sulfate as a penetrant. As the sulfonate, alkylbenzenesulfonate, alkylnaphthalenesulfonate, α-olefinsulfonate, alkylsulfosuccinate, etc. can be listed. These sulfonates are preferably alkali metal salts. As the sulfate, higher alcohol sulfate, alkyl sulfate, etc. can be listed. These sulfates are preferably alkali metal salts. Among them, the hydrophilic agent preferably includes a sulfonate as a penetrant, and more preferably includes an alkali metal salt of sulfonic acid as a penetrant.

From the viewpoint of the stability in the step of applying the hydrophilic agent and the hydrophilicity of the product, the sulfonate used as the penetrating agent is preferably an alkyl sulfosuccinate. The alkyl sulfosuccinate is preferably an alkali metal salt of dialkyl sulfosuccinic acid, more preferably an alkali metal salt of dialkyl sulfosuccinic acid having two alkyl groups having 8 to 16 carbon atoms. Examples of the alkali metal salt of dialkyl sulfosuccinic acid include its lithium salt, its sodium salt, its potassium salt, and the like, and its sodium salt is preferred. Specific examples of alkali metal salts of dialkylsulfosuccinic acid having two alkyl groups having 8 to 16 carbon atoms include dioctylsulfosuccinic acid sodium salt, di(2-ethylhexyl) ) Sulfosuccinate sodium salt, didecyl sulfosuccinate sodium salt, di-dodecyl sulfosuccinate sodium salt, tetradecyl lithium (Li) salt, di-decyl sulfosuccinate Potassium hexaalkyl sulfosuccinate (K) salt, etc. Among these, from the viewpoint of suppressing transfer of the hydrophilic agent when in contact with other members, bis(2-ethylhexyl)sulfosuccinic acid sodium salt is preferred.

When the hydrophilic agent includes a wetting agent, the wetting agent is not particularly limited. For example, the hydrophilic agent may include any one of a cationic surfactant, an anionic surfactant, an amphoteric surfactant, and a nonionic surfactant as the wetting agent.

Examples of the cationic surfactant include quaternary ammonium salts represented by alkyl (or alkenyl) trimethylammonium halide, dialkyl (or alkenyl) dimethyl ammonium halide, and alkylamine salts. and their alkylene oxide adducts. Examples of the anionic surfactant include phosphate ester salts represented by sodium lauryl phosphate, fatty acid salts represented by sodium laurate, and the like. Examples of amphoteric surfactants include salts of these cationic surfactants and anionic surfactants.

From the viewpoint of imparting excellent hydrophilicity to the nonwoven fabric, the wetting agent is preferably a nonionic surfactant. Examples of the nonionic surfactant as a wetting agent include polyol fatty acid esters, polyoxyalkylene fatty acid esters, alkyl polyoxyethylene alcohols, alkylene oxide adducts of polyol fatty acid esters, alkoxylated alkylphenols, fatty acid amides, alkyl diethanol amides, polyoxyalkylene oxides, and the like. Among these, from the viewpoint of imparting excellent hydrophilicity, the hydrophilic agent is preferably a wetting agent comprising at least one selected from the group consisting of polyol fatty acid esters, polyoxyalkylene fatty acid esters, and alkylene oxide adducts of polyol fatty acid esters. The polyol fatty acid ester, polyoxyalkylene fatty acid ester and epoxide adduct of polyol fatty acid ester may be any one of monoester, diester and triester. The polyol fatty acid ester, polyoxyalkylene fatty acid ester and epoxide adduct of polyol fatty acid ester may contain one of monoester, diester and triester, or may contain two or more of them.

Examples of polyhydric alcohol fatty acid esters include glycerin fatty acid esters and sorbitan fatty acid esters. Both the glycerol fatty acid ester and the sorbitan fatty acid ester are preferably esters of glycerin or sorbitan and a fatty acid having 10 to 20 carbon atoms. Specific examples include glyceryl lauric acid monoester, glyceryl oleic acid diester, glyceryl oleic acid triester, sorbitan lauric acid monoester, sorbitan lauric acid diester, and sorbitan lauric acid triester. wait.

As polyoxyalkylene fatty acid esters, polyoxyethylene fatty acid esters, polyoxypropylene fatty acid esters, etc. can be listed. Among these, polyoxyethylene fatty acid esters are preferred. Among polyoxyethylene fatty acid esters, it is preferred that the carbon number of the fatty acid is 10 to 20, and the addition molar number of the ethylene oxide chain (also called EO (ethylene oxide) chain) is 5 to 20. Specifically, polyoxyethylene stearic acid monoester, polyoxyethylene lauric acid monoester, polyoxyethylene lauric acid diester, polyoxyethylene oleic acid monoester, polyoxyethylene oleic acid diester, etc. can be listed.

Examples of alkylene oxide adducts of polyol fatty acid esters include ethylene oxide adducts of polyol fatty acid esters, propylene oxide adducts of polyol fatty acid esters, and the like. Among these, the alkylene oxide adduct of polyhydric alcohol fatty acid ester is an ester of glycerin and a fatty acid having 10 to 20 carbon atoms, and the molar number of ethylene oxide added is preferably 5 to 20. Specific examples include polyoxyethylene glyceryl lauric acid monoester, polyoxyethylene glyceryl lauric acid diester, polyoxyethylene glyceryl lauric acid triester, and the like.

From the viewpoint of imparting excellent hydrophilicity to the nonwoven fabric, the wetting agent is preferably a combination of a polyol fatty acid ester, an alkylene oxide adduct of a polyol fatty acid ester, and a polyoxyalkylene fatty acid ester. . In addition, the humectant is preferably contained in combination with polyol fatty acid ester and polyoxyalkylene fatty acid ester.

As the combination of polyol fatty acid ester and alkylene oxide adduct of polyol fatty acid ester and polyoxyalkylene fatty acid ester, the combination of glycerol fatty acid ester and ethylene oxide adduct of polyol fatty acid ester and polyoxyethylene fatty acid ester is more preferred. Further preferred is the combination of glycerol oleic acid diester, polyoxyethylene glycerol lauric acid diester and triester and polyoxyethylene lauric acid diester.

As a combination of polyol fatty acid ester and alkylene oxide adduct of polyol fatty acid ester, a combination of glycerol fatty acid ester and alkylene oxide adduct of polyol fatty acid ester is preferred, and a combination of glycerol oleic acid diester and glycerol oleic acid triester, and polyoxyethylene oleic acid monoester and polyoxyethylene oleic acid diester is more preferred. In addition, as a combination of polyol fatty acid ester and polyoxyalkylene fatty acid ester, a combination of sorbitan lauric acid monoester, diester and triester and polyoxyethylene lauric acid monoester and diester is preferred, and it is also preferred to combine not only these sorbitan lauric acid ester and polyoxyethylene lauric acid ester, but also polyoxyethylene sorbitan oleic acid monoester, polyoxyethylene sorbitan oleic acid diester and polyoxyethylene sorbitan oleic acid triester.

The mass ratio of the penetrating agent to the wetting agent (penetrating agent/wetting agent) is preferably 0/100 to 60/40, more preferably 5/95 to 50/50, and even more preferably 10/90 to 40/60. If the mass ratio of the wetting agent/penetrating agent is within this range, the hydrophilicity will be excellent.

The content of the hydrophilic agent is preferably 0.01 mass% to 2.0 mass%, more preferably 0.05 mass% to 1.0 mass%, and further preferably 0.1 mass% to 0.5 mass%. The method of imparting the hydrophilic agent is not particularly limited. As a method of imparting the hydrophilic agent, for example, a method of kneading it into a resin as a raw material of the composite fiber, and a method of imparting it to the surface after processing into a fiber shape can be listed. As a method of imparting the hydrophilic agent to the surface of the fiber, there is no particular limitation, and it can be imparted to the surface of the fiber by a known and commonly used method such as a method of immersing the fiber in a solution containing the hydrophilic agent, a method of applying a solution containing the hydrophilic agent to the fiber, etc. As a method of kneading into a raw material resin, for example, there can be cited a method of adding the hydrophilic agent to the raw material resin of at least one of the region A and the region B, and then spinning to form fibers.

(other ingredients) Within the scope that does not impair the purpose of this disclosure, the composite fibers in this disclosure may also contain antioxidants, heat-resistant stabilizers, weather-resistant stabilizers, antistatic agents, slip agents, anti-fogging agents, lubricants, dyes, pigments, natural Various well-known additives such as oil, synthetic oil, and wax are included as optional components.

Furthermore, the nonwoven fabric of the present disclosure may also contain other ingredients as needed. Examples of other ingredients include antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antifogging agents, lubricants, dyes, pigments, light stabilizers, anti-adhesive agents, dispersants, nucleating agents, softeners, waterproofing agents, fillers, natural oils, synthetic oils, waxes, antibacterial agents, preservatives, matting agents, rustproofing agents, fragrances, defoamers, anti-mold agents, insect repellents, and other known additives. These other components may be contained in the interior of the fibers constituting the nonwoven fabric, or may be attached to the surface of the fibers.

The nonwoven fabric laminate of the present disclosure is preferably press-bonded (preferably heat-fused) in a portion. As a press-bonding method for press-bonding a portion of the nonwoven fabric laminate, for example, there can be cited methods using ultrasonic means, heat embossing using an embossing roller, and hot air method. Among them, from the perspective of both shrinkage resistance and softness, the nonwoven fabric layer A and the nonwoven fabric layer B are preferably heat-fused by embossing. Regarding the embossing method, a known method can be used, for example, the method described in Japanese Patent Publication No. 2017-153901 can be used.

The nonwoven fabric laminated body may have a crimped part and a non-crimped part. From the viewpoint of balancing necking resistance and flexibility, the area ratio of the crimped portion is preferably 8% to 22%, more preferably 9% to 21%, and still more preferably 15% to 20%.

Regarding the area ratio of the press-bonded portion, a test piece of 10 mm × 10 mm in size is collected from the nonwoven fabric, and the press-bonded portion of the test piece (e.g., the contact surface with the embossing roller) is observed using an electron microscope (magnification: 100 times), and the ratio of the area of the press-bonded portion to the area of the observed nonwoven fabric is taken as the ratio. In addition, the area ratio of the press-bonded portion that is heat-fused by embossing is also referred to as the embossing area ratio. The embossing area ratio is substantially the same as the area ratio of the protrusion formed on the embossing roller that can form the press-bonded portion.

Examples of the shape of the crimping portion include a circle, an ellipse, an oblong, a square, a rhombus, a rectangle, a quadrilateral, and continuous shapes based on these shapes.

In the nonwoven fabric laminate, it is preferred that region A is exposed in the composite fiber, and the exposed region A and the fiber containing polymer (I) in the nonwoven fabric layer B are heat-fused by embossing. Furthermore, it is preferred that the melting point of the propylene-α-olefin random copolymer contained in the region A and the melting point of the polymer (I) are both below 155°C.

The weight per unit area of the nonwoven fabric laminate of the present disclosure is preferably 8 g/m ² to 30 g/m ² , more preferably 10 g/m ² to 25 g/m ² . When the basis weight is within the above range, the balance between strength and flexibility tends to be excellent.

From the viewpoint of the balance between strength and softness, the ratio of the basis weight A of the nonwoven fabric layer A to the basis weight B of the nonwoven fabric layer B (basis weight A: basis weight B) is preferably 80:20 to 20 : 80, the better is 80:20～25:75, the further best is 80:20～40:60, the extra best is 75:25～40:60, the best is 70:30～40:60.

From the viewpoint of balancing strength, necking resistance, and softness, the thickness of the nonwoven fabric laminate of the present disclosure is preferably 0.10 mm to 4.00 mm, more preferably 0.20 mm to 2.00 mm.

In the present disclosure, the thickness of the nonwoven fabric layer and the thickness of the nonwoven fabric laminate can be measured as follows. Collect 10 test pieces of 100 mm (MD) × 100 mm (CD) corresponding to the nonwoven fabric layer or the nonwoven fabric laminate. Then, for each of the collected test pieces, use a load-type thickness gauge (manufactured by Ozaki Seisakusho Co., Ltd.) and measure the thickness (mm) at a load of 0.3 kPa in accordance with the method described in JIS L 1096:2010. For the average value of the thickness of each test piece, the value rounded to the third decimal place is used as the thickness of the nonwoven fabric layer (mm) or the thickness of the nonwoven fabric laminate (mm).

The tensile strength (MD direction) of the nonwoven fabric laminate of the present disclosure is preferably 10 N/25 mm to 30 N/25 mm, more preferably 16 N/25 mm to 28 N/25 mm. The tensile strength (CD direction) of the nonwoven fabric laminate of the present disclosure is preferably 2 N/25 mm to 10 N/25 mm, more preferably 3 N/25 mm to 7 N/25 mm. The strength INDEX of the nonwoven fabric laminate of the present disclosure is preferably 6 N/25 mm to 20 N/25 mm, more preferably 8 N/25 mm to 18 N/25 mm. The strength INDEX per unit area weight of the nonwoven fabric laminate of the present disclosure is preferably 0.4 N/25 mm (g/m ² ) to 1 N/25 mm (g/m ² ), more preferably 0.5 N/25 mm. (g/m ² )～0.9 N/25 mm (g/m ² ). The tensile strength (MD direction), tensile strength (CD direction), strength INDEX, and strength INDEX per unit area weight of the nonwoven fabric laminate can be measured by the method described in the Examples described below.

The tensile strength of the nonwoven fabric laminate disclosed herein at 5% extension in the MD direction is preferably 2.0 N/25 mm to 12.0 N/25 mm, more preferably 4.5 N/25 mm to 12.0 N/25 mm, and even more preferably 5.0 N/25 mm to 8.0 N/25 mm. The tensile strength of the nonwoven fabric laminate disclosed herein at 5% extension in the MD direction can be 2.5 N/25 mm to 8.0 N/25 mm. The tensile strength of the nonwoven fabric laminate at 5% extension in the MD direction can be measured by the method described in the embodiments described below.

Examples of indicators indicating the bending rigidity of the nonwoven fabric laminate include cantilever, B value, and the like. The cantilever and B value of the nonwoven fabric laminated body can be measured by the method described in the Examples mentioned later.

The cantilever (MD direction) of the nonwoven fabric laminate of the present disclosure is preferably 20 mm to 50 mm, more preferably 25 mm to 45 mm. The cantilever (CD direction) of the nonwoven fabric laminate of the present disclosure is preferably 10 mm to 30 mm, more preferably 15 mm to 25 mm. The cantilever (MD/CD average value) of the nonwoven fabric laminate of the present disclosure is preferably 15 mm to 40 mm, more preferably 20 mm to 35 mm. The cantilever (MD/CD average) is the arithmetic mean of the cantilever (MD direction) and the cantilever (CD direction).

The B value (MD direction) of the nonwoven fabric laminate of the present disclosure is preferably 0.005 gf·cm ² /cm to 0.02 gf·cm ² /cm, more preferably 0.007 gf·cm ^{2 /} cm to 0.015 gf·cm ² /cm . The B value (CD direction) of the nonwoven fabric laminate of the present disclosure is preferably 0.001 gf·cm ² /cm to 0.005 gf·cm ² /cm, more preferably 0.0015 gf·cm ² /cm to 0.004 gf·cm ² /cm . The B value (MD/CD average) of the nonwoven fabric laminate of the present disclosure is preferably 0.003 gf·cm ² /cm to 0.013 gf·cm ² /cm, more preferably 0.004 gf·cm ² /cm to 0.01 gf·cm ² /cm. B value (MD/CD average) is the arithmetic mean of B value (MD direction) and B value (CD direction).

The nonwoven fabric laminate of the present disclosure only needs to have at least one nonwoven fabric layer A and at least one nonwoven fabric layer B laminated, and the order of lamination is not particularly limited. In addition, the nonwoven fabric laminate of the present disclosure may or may not include other nonwoven fabric layers other than the nonwoven fabric layer A and the nonwoven fabric layer B, layers other than nonwoven fabric fabrics, and the like. The other non-woven fabric layers and the layers other than the non-woven fabric may be each independently one layer, or may be two or more layers.

As other nonwoven fabric layers, for example, other spunbond nonwoven fabrics and other meltblown nonwoven fabrics can be listed. As layers other than nonwoven fabrics, woven fabrics, woven fabrics, films, etc. can be listed.

When the nonwoven fabric layer A and the nonwoven fabric layer B are laminated with other nonwoven fabric layers or layers other than nonwoven fabrics, the method of forming the nonwoven fabric laminated body is not particularly limited. For example, heat fusion methods such as heat embossing and ultrasonic welding, mechanical entanglement methods such as needle punching and water spraying, and methods using adhesives such as hot melt adhesives and urethane adhesives can be used to extrude the layer. Pressure and other methods.

Specific examples of the layer structure in the nonwoven fabric laminate of the present disclosure are as follows: Non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer B/non-woven fabric layer B, Non-woven fabric layer A/non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer B, Non-woven fabric layer A/non-woven fabric layer A/non-woven fabric layer A/non-woven fabric layer B, Non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer A/non-woven fabric layer B, Non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer B/non-woven fabric layer A, A laminate with a four-layer structure such as non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer B/non-woven fabric layer B; Non-woven fabric layer A/non-woven fabric layer A/non-woven fabric layer B, Non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer B, A laminated body with a three-layer structure such as non-woven fabric layer A/non-woven fabric layer B/non-woven fabric layer A; A laminate with a two-layer structure such as nonwoven fabric layer B/nonwoven fabric layer A, etc.

In the above, from the viewpoint of balancing the softness and strength of the nonwoven fabric laminate, the nonwoven fabric laminate of the present disclosure is preferably a laminate of the two-layer structure and a three-layer structure, and more preferably is a laminate of the two-layer structure. body.

In the nonwoven fabric laminate of the present disclosure, by increasing the total number of nonwoven fabric layers B relative to the total number of nonwoven fabric layers A, the strength of the nonwoven fabric laminate tends to be improved. On the other hand, by increasing the total number of nonwoven fabric layers A relative to the total number of nonwoven fabric layers B, the softness of the nonwoven fabric laminate tends to be improved.

<Method for manufacturing nonwoven fabric layer A and nonwoven fabric layer B> The method for manufacturing nonwoven fabric layer A and nonwoven fabric layer B is preferably a method for manufacturing nonwoven fabric by a spunbonding method. The spunbonding method includes, for example, a step of melt-spinning a resin composition to form continuous fibers (spinning step), a step of depositing the continuous fibers on a moving collection member to form a nonwoven fabric sheet (nonwoven fabric sheet forming step), and a step of partially pressing the nonwoven fabric sheet (pressing step).

Examples of the manufacturing method of the nonwoven fabric layer A and the nonwoven fabric layer B will be described using FIGS. 3 to 5 . In the following embodiment, the manufacturing method when the nonwoven fabric is a spunbond nonwoven fabric is demonstrated. In addition, the manufacturing method of the nonwoven fabric of this disclosure is not limited to these embodiments. Regarding FIGS. 3 to 5 , the same member numbers are assigned to common structures, and detailed descriptions thereof are omitted.

(Manufacturing method of nonwoven fabric layer A of the first embodiment) In the manufacturing method of the nonwoven fabric layer A of the first embodiment, for example, a spunbond nonwoven fabric manufacturing device 100A shown in FIG. 3 is used to manufacture spunbond nonwoven fabric. The spunbond nonwoven fabric manufacturing device 100A shown in FIG. 3 includes a first extruder 1A, a second extruder 1B, a spinning die 2, a cooling chamber 3, a cooling air supply unit 4, a breathable isolation wall 5, a diffuser 7, a mesh belt 8, and a suction device 9. The spunbond nonwoven fabric manufacturing device 100A is a device for manufacturing a spunbond nonwoven fabric corresponding to the nonwoven fabric layer A containing composite fibers.

The propylene-α-olefin random copolymer or the resin composition containing the same melt-kneaded in the first extruder 1A is ejected from the plurality of nozzles of the spinning die 2 into the cooling chamber 3. Furthermore, the ethylene polymer or the resin composition containing the same melt-kneaded in the second extruder 1B is ejected from the plurality of nozzles of the spinning die 2 into the cooling chamber 3.

The first resin component extruded from the first extruder 1A corresponds to the area A of the composite fiber, and the second resin component extruded from the second extruder 1B corresponds to the area B of the composite fiber. Composite fibers are obtained by composite spinning of these resin components. By suitably changing the cross-sectional shapes of the plurality of nozzles of the spinning die 2 that discharge the first resin component and the second resin component, it is possible to produce a composite fiber such as a parallel type, an eccentric core-sheath type, a core-sheath type, or the like. In addition, by appropriately changing the ratio of the amount of the first resin component extruded from the first extruder 1A to the amount of the second resin component extruded from the second extruder 1B, the eccentricity can be adjusted. In the core-sheath type core-sheath type composite fiber, the volume ratio or mass ratio of the core part to the sheath part is adjusted. In addition, the ratio of the amount of the first ^resin component to the amount of the second resin component can be determined by a general method based on the ¹³ C-Nuclear Magnetic Resonance ( ¹³ C-NMR) spectrum.

An air-permeable partition wall 5 is disposed between the cooling chamber 3 and the cooling air supply unit 4, and the cooling air supply unit 4 supplies cooling air to the cooling chamber 3 through the air-permeable partition wall 5 from two opposing directions.

The width L of the cooling air supply part 4 is not particularly limited, and may be 3 m to 7 m, or 4 m to 6 m. The height of the cooling air supply part 4 is also not particularly limited, and may be 0.4 m to 1.0 m, or 0.6 m to 0.8 m.

The air-permeable partition wall 5 is not particularly limited as long as it is an air-permeable partition wall. From the perspective of rectifying the cooling air, it is preferably a lattice shape such as a quadrilateral shape, a honeycomb shape such as a hexagonal shape or an octagonal shape, and more preferably a honeycomb shape.

In terms of strength and cooling air flow rectification, the thickness of the air-permeable insulation wall 5 is preferably 10 mm to 50 mm, more preferably 20 mm to 40 mm.

The discharged filament 6 containing the first resin component and the second resin component is cooled by the cooling air supplied from the cooling air supply part 4 to the cooling chamber 3 . After the filament 6 is cooled, it passes through a narrow passage (extension part) located on the downstream side of the cooling chamber 3 for using the cooling air used for cooling as the stretching wind, and the long fiber is stretched by the stretching wind ( traction). The stretched fibers are dispersed by the diffuser 7 provided on the downstream side of the narrow passage. The dispersed fibers are sucked by the suction device 9, whereby the nonwoven fabric sheet 10 is accumulated on the mesh belt 8 as a moving collection surface. The nonwoven fabric sheet 10 may also be subjected to heat and pressure treatment through the entangled portion. Through the above operations, a spunbond nonwoven fabric corresponding to the nonwoven fabric layer A containing composite fibers can be obtained.

(Method for manufacturing nonwoven fabric layer B according to first embodiment) In the method of manufacturing the nonwoven fabric layer B of the first embodiment, the spunbond nonwoven fabric is manufactured using, for example, the spunbond nonwoven fabric manufacturing apparatus 100B shown in FIG. 4 . The spunbond nonwoven fabric manufacturing apparatus 100B shown in Figure 4 includes an extruder 1, a spinning die 2, a cooling chamber 3, a cooling air supply part 4, a breathable partition wall 5, a diffuser 7, a mesh belt 8 and a suction Device 9. The spunbond nonwoven fabric manufacturing apparatus 100B is a device for manufacturing the spunbond nonwoven fabric corresponding to the nonwoven fabric layer B.

The polymer (I) or the resin composition containing the polymer (I) melt-kneaded in the extruder 1 is ejected from a plurality of nozzles of the spinning die 2 into the cooling chamber 3, and the polymer (I) or the resin composition is melt-spun to obtain a spunbond nonwoven fabric corresponding to the nonwoven fabric layer B.

(Method for manufacturing nonwoven fabric layer B according to second embodiment) In the method of manufacturing the nonwoven fabric layer B of the second embodiment, the spunbond nonwoven fabric is manufactured using, for example, the spunbond nonwoven fabric manufacturing apparatus 100B shown in FIG. 5 . The difference between the spunbond nonwoven fabric manufacturing apparatus 200 shown in FIG. 5 and the spunbond nonwoven fabric manufacturing apparatus 100B is that the cooling air supply part 14 is divided into two stages via the partition wall 11 which has no air permeability. The structure of the first embodiment and the structure of the second embodiment may be combined appropriately. Hereinafter, the second embodiment will be described focusing on differences from the first embodiment.

The filaments 16 of the polymer (I) or the resin composition containing the polymer (I) discharged from the plurality of nozzles of the spinning die 2 into the cooling chamber 3 are cooled by the cooling air supplied to the cooling chamber 3 from the cooling air supply part 14 . The cooling air supply part 14 is divided into two stages via the non-breathable partition wall 11 , and cooling air is supplied to the cooling chamber 3 from the first cooling air supply part 14A and the second cooling air supply part 14B divided into two stages. The preferable conditions of the cooling air supplied from the first cooling air supply part 14A and the second cooling air supply part 14B are as described above.

After the filaments 16 are cooled, the nonwoven fabric sheet 20 is deposited on the mesh belt 8 in the same manner as in the first embodiment. The nonwoven fabric sheet 20 may also be subjected to heating and pressurization treatment at the intertwined portion. By the above operation, a spunbonded nonwoven fabric corresponding to the nonwoven fabric layer B can be obtained.

In the spunbond nonwoven fabric manufacturing apparatus 200, a gap is provided between the partition wall 11 and the breathable partition wall 5. This can reduce the wind speed difference of the cooling air at the boundary line between the first cooling air supply part 14A on the upper side of the lead sag and the second cooling air supply part 14B on the lower side of the lead sag in the cooling part, and can suppress thread breakage and thread swing.

In terms of more appropriately suppressing wire breakage, the distance d of the gap may be less than 55 mm, less than 50 mm, less than 45 mm, or less than 40 mm. In terms of more appropriately suppressing wire swing, the distance d of the gap may be greater than 5 mm, or greater than 10 mm. Furthermore, the gap is not a necessary structure, and d may also be 0 mm.

The width L of the cooling air supply part 14 is not particularly limited, and may be 3 m to 7 m, or 4 m to 6 m. In addition, the height h of the cooling air supply part 14 is not particularly limited, and may be 0.4 m to 1.0 m, or 0.6 m to 0.8 m.

When the width of the cooling air supply part 14 is L (m), the height of the cooling air supply part 14 is h (m), and the distance of the gap is d (mm), it is preferable that (L×h)/d satisfies 0.056 or more. The height h of the cooling air supply part 14 is equivalent to h ₁ +h ₂ +thickness of the partition wall 11 in FIG. 5 , and the width of the cooling air supply part 14 is the length of the inner side after removing the outer wall of the cooling air supply part 14 in a direction perpendicular to the cooling air supply direction and the height of the cooling air supply part 14 in FIG. 5 .

In addition, the width L of the cooling air supply part 14 and the height h of the cooling air supply part 14 refer to the width and height of the cooling air supply part 14 at the cooling air outlet. Therefore, (L×h) refers to the area of the surface through which the cooling air passes at the cooling air outlet of the cooling air supply unit 14, and (L×h)/d refers to the ratio of this area to the distance d of the gap.

(L×h)/d may be 0.056 to 0.614, or 0.112 to 0.448. When (L×h)/d is 0.056 or more, thread breakage can be more suitably suppressed, and when (L×h)/d is 0.614 or less, thread swing can be more suitably suppressed.

The ratio of the distance from the nozzle face to the partition wall 11 (distance B) to the distance d of the gap (distance B/distance d) may be 5-50.

The ratio of the height (h ₂ ) of the second cooling air supply part 14B to the height (h ₁ ) of the first cooling air supply part 14A may be 0.5 to 1.5, 0.7 to 1.2, or 0.8 to 1.2. The ratio of the thickness of the air-permeable partition wall to the distance d (thickness of the air-permeable partition wall/distance d) is preferably 0.5 to 5.0, more preferably 0.5 to 1.5, and still more preferably 0.8 to 1.2.

The ratio (distance B/distance C) of the distance from the nozzle face to the partition wall 11 (distance B) to the distance from the nozzle face to the entrance of the extension portion (distance C) is preferably 0.2 to 0.8, more preferably 0.2 to 0.6. The process up to the step of forming the nonwoven fabric sheet of the first continuous fiber accumulation includes a known process of cooling and stretching.

In the method of manufacturing the nonwoven fabric laminate of the present disclosure, for example, a piece of nonwoven fabric forming one of the nonwoven fabric layer A and the nonwoven fabric layer B can be accumulated on a moving collecting member, and then the nonwoven fabric piece can be formed into the nonwoven fabric layer A and the nonwoven fabric layer B. The other nonwoven fabric piece in the layer B is stacked on the nonwoven fabric piece stacked on the moving collection member to form a laminated nonwoven fabric piece, and the laminated nonwoven fabric piece is partially pressure-bonded to produce a nonwoven fabric laminated body. At this time, the nonwoven fabric layer A may be one layer or two or more layers, and the nonwoven fabric layer B may be one layer or two or more layers.

When the laminated nonwoven fabric sheet is locally pressed, it is preferably performed by heat pressing using an embossing roller from the viewpoint of both softness and strength. In the heat pressing, the area ratio of the convex portion in the embossing roller is preferably 8% to 22%, more preferably 9% to 21%, and further preferably 15% to 20%. The surface temperature of the embossing roller is preferably in the range of 90°C to 160°C, for example.

<Application> The nonwoven fabric laminate disclosed in the present invention is excellent in softness and neck shrinkage resistance, and therefore can be suitably used for the purposes of previously known nonwoven fabrics. The nonwoven fabric laminate disclosed in the present invention can be suitably used, for example, for absorbent articles (disposable diapers, disposable shorts, sanitary products, diaper pads, pet sheets, etc.), cosmetic materials (facial masks, etc.); sanitary materials (wet compresses, bed sheets, towels, industrial masks, sanitary masks, hair caps, etc.); packaging materials (deoxidizers, hand warmers, wet cloths, food packaging materials), etc. [Examples]

The nonwoven fabric laminate of the present disclosure is described below by way of examples, but the nonwoven fabric of the present disclosure is not limited to the following examples. In the following examples, "%" indicates mass %.

The physical property values and the like in Examples and Comparative Examples were measured by the following methods.

(1) Unit area weight [g/m ² ] Collect 10 test pieces of 100 mm (flow direction: MD) × 100 mm (direction orthogonal to the flow direction: CD) from the nonwoven fabric constituting each layer. The collection locations of the test pieces were set to 10 locations throughout the CD direction. Next, in an environment of 23°C and 50% relative humidity, the mass [g] of each of the collected test pieces was measured using a top-plate electronic balance (manufactured by Kensei Industrial Co., Ltd.). Find the average value of the mass of each test piece. The obtained average value was converted into mass [g] per 1 m ² and rounded to the second decimal place to obtain the weight per unit area [g/m ² ] of each nonwoven fabric sample.

(2) Average fiber diameter [μm] Samples are collected from the nonwoven fabric constituting each layer and photographed at 20x magnification using an ECLIPSE E400 microscope manufactured by Nikon. The diameters of all fibers whose fiber diameters (widths) can be measured are measured among the fibers photographed in the obtained image. Repeat the photographing and measurement until the number of measurements exceeds 100. The fiber diameter is read in μm to the first decimal place. The average value of the obtained diameters is calculated and set as the average fiber diameter (μm).

[Evaluation of Softness] (3) B value (bending rigidity) [gf·cm ² /cm] Randomly collect two test pieces of 200 mm (MD) × 200 mm (CD) from the nonwoven laminate or nonwoven fabric. Then, use the KES-FB2 bending characteristics tester manufactured by Kato Tech Co., Ltd. to clamp the sample between chucks with a spacing of 1 cm, and perform a pure bending test at a deformation speed of 0.50 cm ^-1 sec ^-1 within the curvature range of -2.5 cm ^-1 to +2.5 cm ^-1 . The measured values are averaged in the MD direction and CD direction, and the fifth decimal place is rounded off to calculate the KES-bending rigidity B value (KES-B value). In addition, the average value of the KES-B value was calculated according to the following formula. [Formula] Average value of KES-B value = ((KES-B value in MD direction) + (KES-B value in CD direction))/2

(4) Cantilever (bending stiffness) [mm] Softness was evaluated by the so-called cantilever method in accordance with JIS L 1096. Specifically, the following method was used. 1) Prepare a 2 cm × 15 cm sample piece from a nonwoven laminate or nonwoven fabric and place it on a test bench. 2) Slowly extrude the sample piece in the direction of the arrow and measure the distance the sample piece moves before bending. 3) Measure the case where the MD of the sample piece is parallel to the moving direction and the case where the CD of the sample piece is parallel to the moving direction. Furthermore, the higher the value measured in the above method, the better the rigidity of the nonwoven fabric laminate or nonwoven fabric, and the lower the value, the better the softness of the nonwoven fabric laminate or nonwoven fabric. In addition, the average value of the overhang is calculated according to the following formula. [Formula] Average value of overhang = ((overhang in MD direction) + (overhang in CD direction))/2

[Evaluation of strength] (5) Tensile strength [N/25 mm], strength INDEX [N/25 mm], etc. were measured for the obtained nonwoven fabric laminate or nonwoven fabric in accordance with JIS L 1906. A test piece of 25 mm wide × 200 mm long was collected from the nonwoven fabric laminate or nonwoven fabric, and the test pieces were measured at 5 locations in MD and 5 locations in CD using a tensile testing machine with a chuck distance of 100 mm and a rod speed of 100 mm/min. The average values of the respective values were calculated, and the tensile strength in the MD direction (N/25 mm) and the tensile strength in the CD direction (N/25 mm) were determined. In addition, the strength INDEX, the strength INDEX per unit area weight, and Δ (the strength INDEX per unit area weight) were calculated according to the following formula. [Formula] Strength INDEX = (((tensile strength in MD direction) ² + (tensile strength in CD direction) ² ))/2) ^0.5 [Formula] Strength INDEX per unit area weight = Strength INDEX/unit area weight [Formula] Δ(strength INDEX per unit area weight) = (strength INDEX/unit area weight of the nonwoven fabric laminate in each embodiment including the nonwoven fabric Ax (x is any one of 1 to 5)) - (strength INDEX/unit area weight of the nonwoven fabric Ax in each comparative example)

[Evaluation of necking resistance] (6) Tensile strength at 5% extension in MD direction [N/25 mm] The tensile strength at 5% elongation of the obtained nonwoven fabric laminate or nonwoven fabric was measured in accordance with JIS L 1906, and the measured value was used as an index of necking resistance. Specifically, a test piece with a width of 25 mm and a length of 200 mm is collected from the nonwoven fabric laminate or nonwoven fabric, and a tensile testing machine is used to measure MD: 5 points, CD at a distance between chucks of 100 mm and a head speed of 100 mm/min. : 5, calculate the average value, and calculate the tensile strength (N/25 mm) at 5% extension in the MD direction.

[Luff resistance of the use surface] Regarding the obtained nonwoven fabric laminate and nonwoven fabric, the lint resistance of the use surface was evaluated as follows. In each Example, the lint resistance was evaluated assuming that the nonwoven fabric on the upper side in the table was the use surface. Collect two CD test pieces each of 150 mm (MD) × 150 mm (CD) from the obtained nonwoven fabric laminate or nonwoven fabric. Furthermore, set the collection locations to two arbitrary locations. Next, a friction test was performed on each of the collected test pieces in accordance with the friction fastness test method of JIS L 0849 using a Gakushin-type friction fastness testing machine (new NR-100 manufactured by Daiei Scientific Seiki Seisakusho Co., Ltd.). Furthermore, a cloth tape (manufactured by Teraoka Seisakusho Co., Ltd., No. 1532) was attached to the side of the friction member, and the use surface was reciprocally rubbed in the MD direction 10 times with a load of 300 g applied, and each test piece was tested according to the following standards. Evaluate the fluffing state of the rubbed surface. If the use surface is rubbed back and forth 10 times in the MD direction and the result is that there is no lint, or if the lint is raised to the extent that a small ball of hair (diameter: 0.1 mm or more and less than 0.8 mm) begins to form in one place, the use surface is rubbed in the MD direction. Further, rub the surface to be used back and forth 10 times to confirm the fluffing state of the rubbed surface. In order to confirm whether clear hair balls are beginning to form (diameter: 0.8 mm or more), or multiple small hair balls (diameter: less than 0.8 mm) are visible, the above operation is repeated up to 50 times. In the following evaluation criteria, if it is evaluation A or evaluation B, the lint resistance of the use surface is good. -Evaluation criteria- Evaluation A: There was no fuzzing even after 50 reciprocal rubbings of the surface in the MD direction, or fuzzing to the extent that a small ball of hair (diameter: 0.1 mm or more and less than 0.8 mm) began to form in one place. Evaluation B: There was no fuzzing even after 40 reciprocating rubs on the use surface in the MD direction, or fuzzing to the extent that a small ball of hair (diameter: 0.1 mm or more and less than 0.8 mm) began to form in one place. When further reciprocating rubs were performed 10 times, Clear hair balls begin to form (diameter: more than 0.8 mm), or multiple small hair balls (diameter: less than 0.8 mm) are visible. Evaluation C: There is no fuzzing even after 30 reciprocating rubbings in the MD direction, or fuzzing to the extent that a small ball of hair (diameter: 0.1 mm or more and less than 0.8 mm) begins to form at one place. When further reciprocating rubbing is performed 10 times, Clear hair balls begin to form (diameter: more than 0.8 mm), or multiple small hair balls (diameter: less than 0.8 mm) are visible. Evaluation D: There is no fuzzing even after 20 reciprocating rubs on the use surface in the MD direction, or fuzzing to the extent that a small ball of hair (diameter: 0.1 mm or more and less than 0.8 mm) begins to form in one place. When further reciprocating rubs are performed 10 times, Clear hair balls begin to form (diameter: more than 0.8 mm), or multiple small hair balls (diameter: less than 0.8 mm) are visible. Evaluation E: There is no fuzzing even if the surface is rubbed back and forth 10 times in the MD direction, or fuzzing begins to form in one place (diameter: 0.1 mm or more and less than 0.8 mm). When the surface is rubbed back and forth 10 times, Clear hair balls begin to form (diameter: more than 0.8 mm), or multiple small hair balls (diameter: less than 0.8 mm) are visible. Evaluation F: When the use surface was rubbed back and forth 10 times in the MD direction, clear hair balls began to form (diameter: 0.8 mm or more), or multiple small hair balls (diameter: less than 0.8 mm) were visible.

[Attachment of lint and molten resin to embossing roller and mesh belt] Evaluate the condition of a nonwoven laminate or nonwoven fabric obtained by heat-melting a nonwoven fabric sheet or nonwoven fabric sheet with a laminated structure using the embossing conditions described below according to the following criteria. In the following evaluation criteria, the ideal is evaluation A. -Evaluation criteria- Evaluation A: After the embossing process is continued for 1 hour, lint, resin lumps after broken lint, resin sheets, etc. do not adhere to both the embossing roller and mesh belt. Evaluation B: After the embossing process was continued for 1 hour, resin lumps, resin sheets, etc. were visible attached to at least one of the embossing roller and the mesh belt. Evaluation C: During the embossing process, the fibers constituting the nonwoven fabric laminate or the nonwoven fabric were wound around the embossing roller.

As raw materials used in Examples and Comparative Examples, the following were prepared.

-rPP1- MFR 60 g/10min (ASTM D-1238, 230℃, 2.16 kg load), melting point 142℃, ethylene content 4 mass% propylene-ethylene random copolymer -rPP2- MFR 24 g/10min (ASTM D-1238, 230℃, 2.16 kg load), melting point 105℃, ethylene content 15 mass% propylene-ethylene random copolymer -hPP1- MFR 60 g/10min (230℃, 2.16 kg load), melting point 162℃, propylene homopolymer -PE1- MFR 25 g/10min (ASTM D-1238, 190℃, 2.16 kg load), density 915 kg/m 3 ethylene-1-butene random copolymer -PE2- MFR 50 g/10min (190℃, 2.16 kg load), density 915 kg/m ³ kg load), ethylene-4-methyl-1-pentene random copolymer with a density of 928 kg/m ³ - PE3 - MFR 50 g/10 minutes (190°C, 2.16 kg load), ethylene-1-hexene random copolymer with a density of 948 kg/m ³ - PE4 - MFR 18 g/10 minutes (190°C, 2.16 kg load), ethylene-propylene random copolymer with a density of 955 kg/m ³ (PE1)

<Nonwoven fabric A-1> The spunbond nonwoven fabric manufacturing apparatus including two extruders shown in Figure 3 and the nozzle for forming the eccentric core-sheath type composite fiber with the core exposed as shown in Figure 2(b) are used. , composite melt spinning was performed by the spunbond method to obtain nonwoven fabric A-1 as a spunbonded nonwoven fabric. Specifically, rPP1 was used as the core and guided into the nozzle of the core. In addition, use PE1 as a sheath and guide it into the nozzle of the sheath. The melting temperature and extrusion temperature are both 210°C in the core and sheath. The mass ratio of core to sheath (core:sheath) was set to 60:40. The melted rPP1 and PE1 are ejected from the spinning die at a total ejection rate of 0.5 g/min per nozzle hole, and the composite fibers spun from the nozzle are accumulated on the moving mesh belt to obtain nonwoven fabric A-1. piece of nonwoven fabric. The average fiber diameter of the nonwoven fabric sheet is 17.7 μm, and the weight per unit area of the nonwoven fabric A-1 is 6.7 g/m ² .

<Nonwoven fabric A-2 to nonwoven fabric A-10> In the nonwoven fabric A-1, the raw materials of the core and sheath and the mass ratio of the core and sheath were changed as shown in Table 1, and nonwoven fabrics A-2 to nonwoven fabric A-10 as spunbond nonwoven fabrics were obtained in the same manner as nonwoven fabric A-1. The raw materials, average fiber diameters, and unit area weights of the obtained spunbond nonwoven fabrics are shown in Table 1. In addition, as the raw material of the sheath of nonwoven fabric A-5, a resin composition in which PE1 was mixed at a ratio of 50 mass % and PE3 was mixed at a ratio of 50 mass % was used.

＜Nonwoven fabric B-1＞ The spunbond nonwoven fabric manufacturing apparatus including one extruder shown in FIG. 4 is used, and the nonwoven fabric B-1 which is a spunbond nonwoven fabric is produced by the spunbonding method. Use a nozzle for single-component fibers as the nozzle. rPP1 was melted by an extruder at a molding temperature of 210°C. Molten rPP1 was ejected from the spinning die at a discharge rate of 0.5 g/min per nozzle hole, and melt spinning was performed by the spunbonding method to obtain a nonwoven fabric sheet corresponding to nonwoven fabric B-1. The average fiber diameter of the nonwoven fabric sheet is 16.0 μm.

<Nonwoven fabric B-2 to Nonwoven fabric B-4> Nonwoven fabric B-2 to Nonwoven fabric B-4 were obtained as spunbond nonwoven fabrics in the same manner as the nonwoven fabric B-1 except that the raw materials were changed as shown in Table 1. The raw materials, average fiber diameters, and unit area weights of the obtained spunbond nonwoven fabrics are shown in Table 2.

[Table 1] Nonwoven fabric A-1 Nonwoven fabric A-2 Non-woven fabric A-3 Non-woven fabric A-4 Non-woven fabric A-5 Non-woven fabric A-6 Non-woven fabric A-7 Non-woven fabric A-8 Non-woven fabric A-9 Non-woven fabric A-10 Core (Area A) Type rPP1 rPP1 rPP1 hPP1(75%) +rPP2(25%) rPP1 rPP1 hPP1 hPP1 hPP1 hPP1 Sheath (area B) Type PE1 PE2 PE2 PE2 PE1(50%) +PE3(50%) PE3 PE4 PE4 PE1 rPP1 Comonomer Type 1-Butene 4-Methyl-1-pentene 4-Methyl-1-pentene 4-Methyl-1-pentene 1-Butene, 1-Hexene 1-Hexene Propylene Propylene 1-Butene Ethylene density kg/m ³ 915 928 928 928 932 948 955 955 915 910 MFR g/10 minutes 25 50 50 50 36 50 18 18 25 60 Core: Sheath Quality Ratio 60:40 40:60 60:40 60:40 60:40 60:40 40:60 60:40 40:60 30:70 Fiber shape Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity Eccentricity, curling Exposed or not have have have have have have have have have have Average fiber diameter μm 17.7 16.7 16.1 17.6 17.6 17.7 17.7 17.2 16.8 17.8

[Table 2] Nonwoven fabric B-1 Nonwoven fabric B-2 Nonwoven fabric B-3 Nonwoven B-4 Kind rPP1 (100%) hPP1 (75%) +rPP2 (25%) rPP1 (20%) +hPP1 (80%) hPP1 (100%) average fiber diameter μm 16.0 15.9 15.5 15.9

<Example 1> A nonwoven fabric sheet having a laminated structure formed by laminating nonwoven fabric A-1, nonwoven fabric A-1 and nonwoven fabric B-1 in this order was heat-fused using the following embossing roller and according to the following embossing conditions to obtain a nonwoven fabric laminate. -Embossing roller- Embossing area ratio: 18% Embossing aspect ratio: 4.1 mm/mm ² Rockwell hardness of embossed base material: 37 HRC (Rockwell hardness) -Embossing conditions- Embossing temperature: 125°C Embossing linear pressure: 784 N/cm

<Example 2 to Example 9, Comparative Example 1 to Comparative Example 14> In Example 1, a nonwoven fabric laminate and a nonwoven fabric were obtained in the same manner as in Example 1, except that the raw materials, laminate structure, thermocompression bonding temperature, etc. were changed as described in Tables 3 to 6.

The obtained nonwoven fabric laminate and nonwoven fabric were subjected to the measurement of each physical property and each evaluation, etc. described above. The results are shown in Tables 3 to 6.

[table 3] Example 1 Example 2 Example 3 Comparative example 1 Comparative example 1A Example 4 Comparative example 2 Comparative example 2A laminated structure upper side Kind Nonwoven fabric A-1 Nonwoven fabric A-1 Nonwoven fabric A-1 - Nonwoven fabric A-1 Nonwoven fabric A-2 - Nonwoven fabric A-2 Weight per unit area (g/m ² ) 6.7 6.7 10 - 6.7 10 - 6.7 middle layer Kind Nonwoven fabric A-1 Nonwoven fabric B-1 - - Nonwoven fabric A-1 - - Nonwoven fabric A-2 Weight per unit area (g/m ² ) 6.7 6.7 - - 6.7 - - 6.7 Lower side Kind Nonwoven fabric B-1 Nonwoven fabric B-1 Nonwoven fabric B-1 Nonwoven fabric A-1 Nonwoven fabric A-1 Nonwoven fabric B-1 Nonwoven fabric A-2 Nonwoven fabric A-2 Weight per unit area (g/m ² ) 6.7 6.7 10 20 6.7 10 20 6.7 Embossing temperature ℃ 125 125 125 125 125 125 125 125 intensity MD direction N/25 mm 17.2 20.8 19.1 14.8 13.7 21.5 16.1 17.2 CD direction N/25 mm 4.1 4.1 4.5 4.6 4.5 5.0 6.0 5.5 StrengthINDEX N/25 mm 12.5 14.7 13.6 10.9 10.2 15.6 12.1 12.8 Strength per unit area weight INDEX N/25 mm (g/m ² ) 0.63 0.74 0.68 0.55 0.51 0.78 0.61 0.64 Δ (strength INDEX per unit area weight) N/25 mm (g/m ² ) 0.08 0.19 0.13 - - 0.17 - - cantilever MD direction mm 40 42 41 40 36 41 41 40 CD direction mm 19 twenty two 20 18 18 17 twenty one 16 average value mm 30 32 31 29 27 29 31 28 KES-B value MD direction gf·cm ² /cm 0.0094 0.0116 0.0104 0.0118 0.0113 0.0116 0.0111 0.0107 CD direction gf·cm ² /cm 0.0025 0.0027 0.0026 0.0017 0.0029 0.0024 0.0022 0.0018 average value gf·cm ² /cm 0.00595 0.00715 0.00652 0.0068 0.0071 0.0070 0.0067 0.0063 Pilling - A A A E E B E E Tensile strength at 5% extension in MD direction N/25 mm 4.9 6.0 5.4 4.4 3.7 6.0 4.7 4.8 Attachment of wire scraps and molten resin A A A B B A B B

[Table 4] Embodiment 5 Embodiment 6 Embodiment 7 Comparison Example 3 Embodiment 8 Comparison Example 4 Layered structure Upper side Type Non-woven fabric A-3 Non-woven fabric A-3 Non-woven fabric A-3 - Non-woven fabric A-4 - Weight per unit area (g/m ² ) 10 6.7 6.7 - 6.7 - Middle layer Type - Non-woven fabric A-3 Non-woven fabric B-1 - Non-woven fabric A-4 - Weight per unit area (g/m ² ) - 6.7 6.7 - 6.7 - Lower side Type Non-woven fabric B-1 Non-woven fabric B-1 Non-woven fabric B-1 Non-woven fabric A-3 Nonwoven fabric B-2 Non-woven fabric A-4 Weight per unit area (g/m ² ) 10 6.7 6.7 20 6.7 20 Embossing temperature ℃ 125 125 125 125 125 125 Strength MD direction N/25 mm 22.4 20.2 24.6 17.6 18.5 15.3 CD Direction N/25 mm 5.0 4.8 5.6 6.0 4.3 4.7 Strength INDEX N/25 mm 16.3 14.7 17.9 13.1 13.4 11.3 Strength per unit area weight INDEX N/25 mm (g/m ² ) 0.81 0.74 0.89 0.66 0.67 0.57 Δ(strength per unit area weight INDEX) N/25 mm (g/m ² ) 0.16 0.08 0.24 - 0.11 - Overhang MD direction mm 41 40 42 41 40 41 CD Direction mm 18 16 19 twenty two 18 18 average value mm 29 28 30 32 29 30 KES-B value MD direction gf·cm ² /cm 0.0120 0.0109 0.0133 0.0120 0.0108 0.0119 CD Direction gf·cm ² /cm 0.0025 0.0024 0.0026 0.0017 0.0025 0.0018 average value gf·cm ² /cm 0.0073 0.0067 0.0080 0.0069 0.0067 0.0069 Fuzziness - A A A D B D Tensile strength at 5% elongation in MD direction N/25 mm 6.3 5.6 6.9 5.2 5.2 4.5 Adhesion of shavings and molten resin A A A B A B

[table 5] Embodiment 9 Comparison Example 5 Comparative Example 6 Comparison Example 7 Comparative Example 8 Comparative Example 9 Layered structure Upper side Type Non-woven fabric A-5 - Non-woven fabric A-3 Non-woven fabric A-6 Non-woven fabric A-7 Non-woven fabric A-8 Weight per unit area (g/m ² ) 6.7 - 10 6.7 6.7 6.7 Middle layer Type Non-woven fabric A-5 - - Non-woven fabric A-6 Non-woven fabric A-7 Non-woven fabric A-8 Weight per unit area (g/m ² ) 6.7 - - 6.7 6.7 6.7 Lower side Type Non-woven fabric B-1 Non-woven fabric A-5 Non-woven fabric B-4 Non-woven fabric B-1 Non-woven fabric B-4 Non-woven fabric B-4 Weight per unit area (g/m ² ) 6.7 20 10 6.7 6.7 6.7 Embossing temperature ℃ 125 125 125 125 125 132 Strength MD direction N/25 mm 19.5 16.7 Extremely weak 17.2 23.3 24.1 CD Direction N/25 mm 4.1 4.8 3.8 4.6 5.3 Strength INDEX N/25 mm 14.1 12.3 - 12.5 16.8 17.5 Strength per unit area weight INDEX N/25 mm (g/m ² ) 0.71 0.61 - 0.62 0.84 0.87 Δ(strength per unit area weight INDEX) N/25 mm (g/m ² ) 0.09 - - - - - Overhang MD direction mm 41 43 - 40 64 69 CD Direction mm 17 18 - twenty two 31 32 average value mm 29 30 - 31 47 50 KES-B value MD direction gf·cm ² /cm 0.0109 0.0120 The embossing is weak and is not a sample that can withstand the test. 0.0118 0.0344 0.0423 CD Direction gf·cm ² /cm 0.0026 0.0021 0.0024 0.0046 0.0056 average value gf·cm ² /cm 0.0067 0.0070 0.0071 0.0195 0.0239 Fuzziness - A C F E D F Tensile strength at 5% elongation in MD direction N/25 mm 6.0 5.7 Extremely weak 5.3 10.9 9.0 Adhesion of shavings and molten resin A B C C A A

[Table 6] Comparative example 10 Comparative example 11 Comparative example 12 Comparative example 13 Comparative example 14 laminated structure upper side Kind Nonwoven fabric A-9 Nonwoven fabric A-10 Nonwoven fabric A-10 - - Weight per unit area (g/m ² ) 6.7 6.7 6.7 - - middle layer Kind Nonwoven fabric A-9 Nonwoven fabric B-3 Nonwoven fabric A-10 - - Weight per unit area (g/m ² ) 6.7 6.7 6.7 - - Lower side Kind Nonwoven B-4 Nonwoven fabric B-3 Nonwoven fabric B-3 Nonwoven B-4 Nonwoven fabric B-1 Weight per unit area (g/m ² ) 6.7 6.7 6.7 20 20 Embossing temperature ℃ 125 125 125 132 125 intensity MD direction N/25mm 12.5 23.3 20.7 31.8 30.4 CD direction N/25mm 3.7 5.9 4.7 8.5 8.7 StrengthINDEX N/25 mm 9.2 17.0 15.0 23.3 22.4 Strength per unit area weight INDEX N/25 mm (g/m ² ) 0.46 0.85 0.75 1.16 1.12 Δ (strength INDEX per unit area weight) N/25 mm (g/m ² ) - - - - - Cantilever MD direction mm 39 48 43 61 49 CD direction mm 18 twenty three 20 37 twenty four average value mm 29 35 32 49 37 KES-B value MD direction gf·cm ² /cm 0.0205 0.0202 0.0178 0.0470 0.0150 CD direction gf·cm ² /cm 0.0026 0.0040 0.0036 0.0077 0.0031 average value gf·cm ² /cm 0.0115 0.0121 0.0107 0.0274 0.0091 Pilling - F B C A A Tensile strength at 5% extension in MD direction N/25 mm 4.7 6.3 5.1 12.2 9.1 Attachment of wire scraps and molten resin C A A A A

It can be seen that the nonwoven fabric laminates obtained in Examples 1 to 9 are excellent in terms of both softness and necking resistance. Furthermore, it can be seen that by laminating the nonwoven fabric B-1 or the nonwoven fabric B-2 on the nonwoven fabric A-1 to the nonwoven fabric A-5 described in Comparative Examples 1 to 5, it is possible to suppress the adhesion of lint and molten resin to the embossing roller and the mesh belt during the embossing process. It can be seen that, compared with a nonwoven fabric laminated body in which only nonwoven fabric A-1 or only nonwoven fabric A-2 is laminated as in Comparative Examples 1A and 2A, by laminating nonwoven fabric A-1 or nonwoven fabric A-2 and nonwoven fabric B-1 as in Examples 1 to 4, the evaluation of the fuzziness becomes good, and during the embossing process, the adhesion of lint and molten resin to the embossing roller and mesh belt can be suppressed. Even when the nonwoven fabric layer to be rubbed is the same, the evaluation of the fuzziness tends to change depending on the presence or absence of the nonwoven fabric layer B and the type of the nonwoven fabric layer B. For example, as shown in each embodiment, by combining nonwoven fabric A-1 to nonwoven fabric A-5 with nonwoven fabric B-1 or nonwoven fabric B-2, there is a tendency to achieve both fuzziness and softness.

The Δ (strength per unit area weight INDEX) of the nonwoven fabric laminates obtained in Examples 1 to 9 was greater than 0. Thus, it was confirmed that by laminating the nonwoven fabric B-1 or the nonwoven fabric B-2 on the nonwoven fabric A-1 to the nonwoven fabric A-5 described in Comparative Examples 1 to 5, the strength per unit area weight was improved compared to using the nonwoven fabric A-1 to the nonwoven fabric A-5 alone.

The entire disclosure of Japanese Patent Application No. 2022-090784 filed on June 3, 2022 is incorporated by reference into this specification. All documents, patent applications, and technical specifications described in this specification are incorporated by reference into this specification to the same extent as the following cases, which are cases where each document, patent application, and technical specification is specifically and individually described as being incorporated by reference.

1: Area A/Extruder 1A: First extruder 1B: Second extruder 2: Area B/Spinning die 3: Core part/cooling chamber 4: Sheath part/cooling air supply part 5: Breathable Sexual partition wall 6, 16: Filament 7: Diffuser 8: Mesh belt 9: Suction device 10, 20: Non-woven fabric sheet 11: Partition wall 14: Cooling air supply part 14A: First cooling air supply part 14B: Second cooling air supply part 100A, 100B, 200: spunbond nonwoven fabric manufacturing device B, C, d: distance h ₁ , h ₂ : height

FIG. 1 is a schematic diagram showing an example of the cross-section of the side-by-side composite fibers included in the nonwoven fabric layer A. (a) and (b) of FIG. 2 are schematic views showing an example of a cross-section of the eccentric core-sheath type composite fiber included in the nonwoven fabric layer A. FIG. 3 is a schematic diagram showing the manufacturing method of the nonwoven fabric layer A according to the first embodiment. FIG. 4 is a schematic diagram showing the manufacturing method of the nonwoven fabric layer B according to the first embodiment. FIG. 5 is a schematic diagram showing a method of manufacturing the nonwoven fabric layer B according to the second embodiment.

Claims (14)

A nonwoven fabric laminated body, including: a nonwoven fabric layer A, including a composite fiber, the composite fiber includes a region A containing a propylene-α-olefin random copolymer and a region B containing an ethylene polymer, and the composite fiber is a side-by-side type Or eccentric core sheath type, the ratio of the area A to the area B is 70:30 to 10:90 on a mass basis (area A: area B), and the density of the area B is 900 kg/m ³ ~945 kg/m ³ ; and non-woven fabric layer B, including fibers containing polymer (I), which is propylene and at least one selected from ethylene and α-olefins with a carbon number of 4 to 20 of random copolymers. The nonwoven fabric laminate according to claim 1, wherein the vinyl polymer contains an ethylene-α-olefin copolymer, The ethylene-α-olefin copolymer is at least one selected from the group consisting of ethylene-1-butene copolymer and ethylene-4-methyl-1-pentene copolymer. The nonwoven fabric laminate according to claim 2, wherein the ethylene-α-olefin copolymer is an ethylene-4-methyl-1-pentene copolymer. The nonwoven fabric laminate according to claim 2 or 3, wherein both the propylene-α-olefin random copolymer and the polymer (I) are random copolymers of propylene and ethylene. The nonwoven fabric laminate according to claim 4, wherein the melting point of the propylene-α-olefin random copolymer and the melting point of the polymer (I) are both 155° C. or lower. The nonwoven fabric laminate according to claim 4, wherein the region A of the composite fiber is exposed. The nonwoven fabric laminate according to claim 4, wherein the nonwoven fabric layer A and the nonwoven fabric layer B are thermally welded by embossing, The embossing area rate is 8% to 22%. The nonwoven fabric laminate as described in claim 4, wherein the melt flow rate of the ethylene polymer (American Society for Testing and Materials D-1238, 190°C, 2.16 kg load) is 20 g/10 minutes to 60 g/10 minutes. The nonwoven fabric laminate according to claim 4, wherein the density of the region B is 915 kg/m ³ to 940 kg/m ³ . The nonwoven fabric laminate according to claim 4, wherein the ratio of the area A to the area B is 65:35 to 35:65 (area A:area B) on a mass basis. The nonwoven fabric laminate according to claim 4, wherein both the nonwoven fabric layer A and the nonwoven fabric layer B are spunbonded nonwoven fabrics. The nonwoven fabric laminate according to claim 4, wherein the content of the polymer (I) is 70% by mass or more relative to the total amount of the fibers contained in the nonwoven fabric layer B. The nonwoven fabric laminate as described in claim 4 comprises a hydrophilic agent. The nonwoven fabric laminate as described in claim 4, wherein the tensile strength at 5% elongation in the longitudinal direction is 2.5 N/25 mm to 8.0 N/25 mm.