KR20220137760A - Laminated non-woven and sanitary materials - Google Patents

Abstract

The present invention is a laminated nonwoven fabric in which a nonwoven fabric layer (A) comprising a first thermoplastic resin fiber and a nonwoven fabric layer (B) comprising a second thermoplastic resin fiber are laminated in at least one layer, respectively, constituting the nonwoven fabric layer (A) The ratio (Db/Da) of the average single fiber diameter Db of the fibers constituting the nonwoven layer (B) to the average single fiber diameter Da of the fibers is 1.1 or more, and the nonwoven fabric layer (B) is laminated on at least one outermost surface, Moreover, it is a laminated nonwoven fabric whose surface contact angle with water of a laminated nonwoven fabric is 30 degrees or less, and a contact angle with water on the back surface of a laminated nonwoven fabric is 30 degrees or less. The laminated nonwoven fabric of the present invention has sufficient absorption and quick-drying properties for use as a nonwoven fabric for sanitary materials. By using the laminated nonwoven fabric of the present invention as at least a part of the sanitary material, it is possible to obtain a sanitary material having excellent water absorption and excellent quick-drying properties.

Description

Laminated non-woven and sanitary materials

The present invention relates to a laminated nonwoven fabric having excellent absorbency and quick-drying properties and particularly suitable for use as a sanitary material, and a sanitary material using the same.

In recent years, various studies have been made in order to make a wearer feel comfortable when a sanitary material is worn with respect to a nonwoven fabric used for sanitary material applications such as disposable diapers, sanitary napkins, and masks. In particular, in the case of a surface member that comes in direct contact with the skin, both the absorbency of absorbing moisture quickly and the quick-drying property of transferring the absorbed moisture from the outermost layer to leave the surface dry without excessive moisture, that is, “absorption quick-drying” I need this.

As a means for imparting absorbency to the nonwoven fabric, it is effective to use a nonwoven fabric containing hydrophilic fibers or to subject the nonwoven fabric to hydrophilic treatment. However, since these techniques do not have a function of transferring the absorbed moisture from the outermost layer, there is a problem that the quick-drying property is poor.

From this background, for the purpose of imparting absorption and quick-drying properties to the nonwoven fabric, it is a laminated nonwoven fabric having a laminated structure of fiber layers containing long fibers, and hydrophilic fibers having a distance or flatness between the hydrophobic layer and the fibers in a specific range. A laminated nonwoven fabric comprising a hydrophilic layer containing

In addition, as a technique for laminating a nonwoven fabric, between the first and third nonwoven fabric constituent layers comprising fibers having an average single fiber diameter within a specific range, and the first and third nonwoven fabric layers, the average single fiber diameter is more An absorbent article comprising a laminated nonwoven fabric having a second nonwoven fabric constituent layer containing thin fibers is proposed (refer to Patent Document 2).

International Publication No. 2018/167881 Japanese Patent Publication No. 2013-518698

In the technique of patent document 1, by forming a hydrophilic gradient in the thickness direction of a nonwoven fabric, even if there exists a surface which arrange|positioned the hydrophobic layer in the outermost layer, constant water absorption performance is expressed. However, since the outermost surface is a hydrophobic layer, the performance is not sufficient to absorb a large amount of moisture such as urine, and the quick-drying property is also insufficient because liquid residue tends to occur.

On the other hand, the technique of Patent Document 2 relates to a laminated nonwoven fabric having a structure in which nonwoven fabric layers composed of fibers having different average single fiber diameters are laminated. However, since the nonwoven fabric is used for the barrier cuff and has a structure that prevents backflow of fluid, that is, does not allow moisture to pass through, liquid residue is likely to occur on the surface of the nonwoven fabric. For this reason, the technique of patent document 2 was a thing with inadequate water absorption and quick-drying.

Then, it is an object of this invention to provide the laminated nonwoven fabric which is sufficient water absorption and quick-drying in order to maintain comfort at the time of wearing, and is used suitably for a sanitary material.

As the present inventors have studied, it is effective to increase the hydrophilicity of the nonwoven fabric itself in order to increase the absorbency of the nonwoven fabric. It was confirmed that the subject that this fell had occurred. On the other hand, when hydrophobic fibers are used in a part of the nonwoven fabric for the purpose of improving quick-drying properties or when a hydrophilicity gradient is provided in the thickness direction, the water absorbency of the surface of the nonwoven fabric is reduced as a result, and problems such as liquid retention occur. It turned out

Accordingly, the inventors of the present invention, as a result of intensive studies to achieve the above object, in the laminated nonwoven fabric, set the ratio of the average single fiber diameter of the fibers constituting each nonwoven fabric layer to a specific range, and laminated each nonwoven fabric layer in a specific configuration In addition, by making the contact angle with water of each nonwoven fabric layer into a specific range, it was found that a nonwoven fabric having sufficient absorbency and quick-drying properties to maintain comfort during wearing was found, and the present invention was completed.

The laminated nonwoven fabric of the present invention is a laminated nonwoven fabric in which at least one nonwoven fabric layer (A) containing a first thermoplastic resin fiber and a nonwoven fabric layer (B) containing a second thermoplastic resin fiber are laminated in at least one layer, the nonwoven fabric layer (A) ) the ratio (Db/Da) of the average single fiber diameter Db of the fibers constituting the nonwoven layer (B) to the average single fiber diameter Da of the fibers constituting the fiber is 1.1 or more, and the nonwoven fabric layer (B) is at least one of the outermost It is laminated on the surface, and the contact angle with water on the surface of the laminated nonwoven fabric is 30 degrees or less, and the contact angle with water on the back surface of the laminated nonwoven fabric is 30 degrees or less.

In addition, at least a part of the sanitary material of the present invention is constituted by the above-described laminated nonwoven fabric.

The laminated nonwoven fabric of the present invention has sufficient absorption and quick-drying properties for use as a nonwoven fabric for sanitary materials. By using the laminated nonwoven fabric of the present invention as at least a part of the sanitary material, it is possible to obtain a sanitary material having excellent water absorption and excellent quick-drying properties.

The laminated nonwoven fabric of the present invention can be used as a part of hygiene materials such as paper diapers, sanitary napkins, gauze, bandages, masks, gloves, and bandages.

The laminated nonwoven fabric of the present invention is a laminated nonwoven fabric in which at least one nonwoven fabric layer (A) containing a first thermoplastic resin fiber and a nonwoven fabric layer (B) containing a second thermoplastic resin fiber are laminated in at least one layer, the nonwoven fabric layer (A) ) the ratio (Db/Da) of the average single fiber diameter Db of the second thermoplastic resin fiber constituting the nonwoven layer (B) to the average single fiber diameter Da of the first thermoplastic resin fiber constituting the nonwoven fabric layer (Db/Da) is 1.1 or more, and the nonwoven fabric layer (B) is laminated|stacked on at least one outermost surface, and the contact angle with water of the surface of the laminated nonwoven fabric is 30 degrees or less, and the contact angle with water of the back surface of the laminated nonwoven fabric is 30 degrees or less. Hereinafter, the constituent elements will be described in detail.

[Thermoplastic Fiber]

The laminated nonwoven fabric of the present invention includes a nonwoven fabric layer (A) comprising a first thermoplastic resin fiber and a nonwoven fabric layer (B) comprising a second thermoplastic resin fiber.

In these 1st thermoplastic resin fiber and 2nd thermoplastic resin fiber, "thermoplastic resin fiber" refers to the fiber containing a thermoplastic resin. The number of thermoplastic resins may be one, and a some thermoplastic resin may be included.

In the present invention, examples of the thermoplastic resin used for the thermoplastic resin fiber include aromatic polyester polymers such as "polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyhexamethylene terephthalate" and copolymers thereof. , "polylactic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyhydroxybutyrate-polyhydroxyvalerate copolymer, polycaprolactone", etc. Copolymers, aliphatic polyamide polymers such as "polyamide 6, polyamide 66, polyamide 610, polyamide 10, polyamide 12, polyamide 6-12" and copolymers thereof, "polypropylene, polyethylene, polybutene" , polymethylpentene" and its copolymers, water-insoluble ethylene-vinyl alcohol copolymer-based polymers containing 25 to 70 mol% of ethylene units, polystyrene-based, polydiene-based, chlorine-based, polyolefin-based, Polyester-based, polyurethane-based, polyamide-based, fluorine-based elastomer-based polymers, etc. can be selected from among them. In addition, in the polymer, various additives such as inorganic substances such as titanium oxide, silica, barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, optical brighteners, antioxidants, or ultraviolet absorbers may be included in the polymer. do.

In the present invention, the thermoplastic resin is preferably a thermoplastic resin containing 0.5% by mass or more of a fatty acid amide compound. When the content of the fatty acid amide compound is preferably 0.5 mass % or more, more preferably 0.7 mass % or more, and still more preferably 1.0 mass % or more, the fatty acid amide compound acts as a lubricant on the fiber surface, so that the feel is improved. It becomes an excellent spunbond nonwoven fabric. Moreover, although the upper limit in particular of content of the fatty acid amide compound in this invention is not restrict|limited, From a viewpoint of cost and productivity, 5.0 mass % or less is preferable.

In the present invention, when the thermoplastic resin contains the fatty acid amide compound, it is preferable that the fatty acid amide compound has 15 or more and 50 or less carbon atoms. Examples of the fatty acid amide compound having 15 or more and 50 or less carbon atoms include a saturated fatty acid monoamide compound, a saturated fatty acid diamide compound, an unsaturated fatty acid monoamide compound, and an unsaturated fatty acid diamide compound. In addition, the number of carbon atoms in the present invention means the number of carbon atoms contained in the molecule, and specifically, palmitic acid amide, palmitoleic acid amide, stearic acid amide, oleic acid amide, elaidic acid amide, baccenic acid amide, and linoleic acid. Amide, linolenic acid amide, pinolenic acid amide, eleostearic acid amide, stearidonic acid amide, bocepentaenoic acid amide, arachidic acid amide, gadoleic acid amide, eicosenic acid amide, eicosadienoic acid amide, mid acid amide, Eicosatrienoic acid amide, arachidonic acid amide, eicosatetraenoic acid amide, eicosapentaenoic acid amide, henicosylic acid amide, behenic acid amide, erucic acid amide, docosadienoic acid amide, adrenoic acid amide, ose Bond acid amide, sardine amide, docosahexaenoic acid amide, lignoceric acid amide, nervonic acid amide, tetracosapentaenoic acid amide, nisinic acid amide, cerotic acid amide, montanic acid amide, melisic acid amide, ethylene ratio scapric acid amide, ethylene bis lauric acid amide, methylene bis lauric acid amide, ethylene bis stearic acid amide, ethylene bisole acid amide, ethylene bis hydroxy stearic acid amide, ethylene bis behenic acid amide, ethylene bis erucic acid amide, and hexamethylenebisstearic acid amide, hexamethylenebisbehenic acid amide, hexamethylenehydroxystearic acid amide, distearyladipic acid amide, distearylsebasic acid amide, and hexamethylenebisoleic acid amide. It can also be used in combination. By setting the number of carbon atoms of the fatty acid amide compound to preferably 15 or more, more preferably 23 or more, and still more preferably 30 or more, excessive precipitation of the fatty acid amide compound on the fiber surface is suppressed, and the spinnability and processing stability are excellent. , high productivity can be maintained. In addition, when the number of carbon atoms of the fatty acid amide compound is preferably 50 or less, more preferably 45 or less, and still more preferably 42 or less, the fatty acid amide compound is appropriately precipitated on the fiber surface, so that a spunbonded nonwoven fabric excellent in feel is obtained. do. The fatty acid amide compound preferably has 15 to 50 carbon atoms, more preferably 23 to 45 carbon atoms, and still more preferably 30 to 42 carbon atoms.

In the present invention, the thermoplastic resin fiber may be a single component fiber as well as a composite fiber obtained by compounding two or more types of resins. When the thermoplastic resin fiber is a composite fiber, it may be appropriately selected from a core-sheath type, a sea-island type, a side-by-side type, an eccentric core-sheath type, and the like. In the present invention, the thermoplastic resin fiber may be a half fiber composite fiber in which a part or the whole of the fiber is divided into a plurality of fibers from one fiber.

In the present invention, the cross-sectional shape of the thermoplastic resin fiber may be a triangular, flat, hexagonal or hollow cross-section as well as a round cross-section. When the laminated nonwoven fabric of the present invention is used for a sanitary material, a round cross-section is preferable from the viewpoint of high productivity and excellent flexibility.

In the present invention, all of the thermoplastic resin fibers preferably have a contact angle with water of less than 90°. The contact angle with water in the thermoplastic resin fiber is an index different from the contact angle with water in the nonwoven fabric to be described later. Further, in the present invention, the contact angle of the thermoplastic resin fibers with water is, for example, an inkjet method droplet ejection of the thermoplastic resin fibers taken out from the nonwoven fabric left for 24 hours or more in a room at a room temperature of 20°C and a relative humidity of 65%. It is obtained by measuring the angle between the air interface of the droplet and the fiber when a very small amount (15 pL) of water droplets are deposited on the fiber surface using an automatic contact angle meter equipped with a part.

The first thermoplastic resin fiber and the second thermoplastic resin fiber may have the same or different thermoplastic resin and fiber cross sections.

[Non-woven fabric layer (A) comprising first thermoplastic resin fibers]

In the laminated nonwoven fabric of the present invention, the nonwoven fabric layer (A) is composed of the first thermoplastic resin fibers.

In the present invention, the nonwoven fabric layer (A) preferably contains a long fiber nonwoven fabric. When the nonwoven fabric layer (A) contains the long fiber nonwoven fabric, it becomes a nonwoven fabric having high productivity and excellent mechanical properties.

In this invention, it is preferable that the average monofilament diameter of the 1st thermoplastic resin fiber which comprises a nonwoven fabric layer (A) is 1.0 micrometer - 25.0 micrometers. When the average single fiber diameter of the first thermoplastic resin fiber is preferably 1.0 µm or more, more preferably 1.5 µm or more, when used as a sanitary material, moisture tends to migrate to an adjacent absorber. In addition, by setting the average single fiber diameter of the first thermoplastic resin fibers to preferably 25.0 µm or less, more preferably 20.0 µm or less, and still more preferably 16.0 µm or less, the absorbency of the nonwoven fabric layer (A) due to the capillary effect is improved. is improved The average single fiber diameter of the 1st thermoplastic resin fiber becomes like this. More preferably, they are 1.0 micrometer - 20.0 micrometers, More preferably, they are 1.5 micrometers - 16.0 micrometers.

The average single fiber diameter as used herein is calculated as follows.

First, an image is taken by taking the cross section of the fibers constituting the nonwoven fabric layer (A) at a magnification at which one fiber can be observed with a scanning electron microscope. Then, using the captured image, using image analysis software (for example, "WinROOF2015" manufactured by Mitani Shoji Co., Ltd., etc.), the area Af formed by the cross-sectional outline of the single fiber is measured, and the area Af and Calculate the diameter of a perfect circle with the same area. This is measured for 20 single fibers arbitrarily extracted from the same nonwoven fabric layer, a simple number average is obtained, the unit is μm, and the value rounded to two decimal places is the average single fiber diameter in the present invention.

[Nonwoven fabric layer (B) containing second thermoplastic resin fibers]

In the laminated nonwoven fabric of the present invention, the nonwoven fabric layer (B) is composed of the second thermoplastic resin fibers. In the present invention, the nonwoven fabric layer (B) preferably includes a long fiber nonwoven fabric. When the nonwoven fabric layer (B) contains the long fiber nonwoven fabric, it becomes a nonwoven fabric having high productivity and excellent mechanical properties.

In this invention, it is preferable that the average single fiber diameter of the 2nd thermoplastic resin fiber which comprises a nonwoven fabric layer (B) is 3.0 micrometers - 30.0 micrometers. The average single fiber diameter of the second thermoplastic resin fiber is preferably 3.0 µm or more, more preferably 5.0 µm or more, and still more preferably 8.0 µm or more, so that the fibers of the nonwoven fabric layer do not become too dense and have adequate water permeability. It becomes a nonwoven fabric having In addition, when the average single fiber diameter of the second thermoplastic resin fiber is preferably 30.0 µm or less, more preferably 27.0 µm or less, and still more preferably 25.0 µm or less, when used as a sanitary material, a nonwoven fabric having a good surface feel becomes The average single fiber diameter of the second thermoplastic resin fiber is more preferably 5.0 µm to 27.0 µm, still more preferably 8.0 µm to 25.0 µm.

[Average single fiber diameter of nonwoven fabric layer (A) and nonwoven fabric layer (B)]

In the laminated nonwoven fabric of the present invention, the ratio of the average single fiber diameter Db of the second thermoplastic resin fibers constituting the nonwoven fabric layer (B) to the average single fiber diameter Da of the first thermoplastic resin fibers constituting the nonwoven fabric layer (A) It is important that (Db/Da, hereinafter simply abbreviated as the average single fiber diameter ratio in some cases) is 1.1 or more.

The average single fiber diameter ratio as used herein refers to the average single fiber diameter Da of the first thermoplastic resin fibers constituting the nonwoven fabric layer (A) and the second thermoplastic resin fibers constituting the nonwoven fabric layer (B) using the following method. It is a value obtained by measuring the average single fiber diameter Db of , calculating the ratio (Db/Da), and rounding up to two decimal places.

First, an image is taken by taking the cross section of the fibers constituting the nonwoven fabric layer (A) or the nonwoven fabric layer (B) at a magnification at which one fiber can be observed with a scanning electron microscope. Then, using the captured image, using image analysis software (for example, "WinROOF2015" manufactured by Mitani Shoji Co., Ltd., etc.), the area Af formed by the cross-sectional outline of the single fiber is measured, and the area Af and Calculate the diameter of a perfect circle with the same area. This is measured for 20 single fibers arbitrarily extracted from the same nonwoven fabric layer, a simple number average is obtained, the unit is μm, and the value rounded to two decimal places is the average single fiber diameter in the present invention.

In general, in a nonwoven fabric, the size of the voids formed by weaving between the fibers changes according to the average single fiber diameter of the constituent fibers. For this reason, when nonwoven fabric layers having different average single fiber diameters are stacked on top of each other, nonwoven fabric layers having different inter-fiber pore sizes are stacked. Moisture absorbed in the layer can be transferred to the nonwoven fabric layer containing the fast fibers. In addition, as a result of intensive studies, the present inventors found that, by setting the average single fiber diameter ratio within a specific range, not only the effect of improving water absorption due to the difference in capillary effect, but also quick-drying is imparted to the surface of the nonwoven fabric layer containing coarse fibers.

Therefore, by setting the average single fiber diameter ratio (Db/Da) to 1.1 or more, preferably 1.2 or more, and more preferably 1.3 or more, the above-described capillary effect works, and good absorbency and good absorbency in the nonwoven fabric layer (B) Quick-drying can be obtained. Moreover, although the upper limit in particular of the average single fiber diameter ratio in this invention is not restrict|limited, From a viewpoint of process stability and productivity, 10.0 or less is preferable.

[Laminated nonwoven fabric]

The laminated nonwoven fabric of the present invention is a laminated nonwoven fabric in which the nonwoven fabric layer (A) and the nonwoven fabric layer (B) are each laminated in at least one layer, and it is important that the nonwoven fabric layer (B) is laminated on at least one outermost layer. . In this way, when the nonwoven fabric layer (B) absorbs moisture from the nonwoven fabric layer (B) side by laminating the nonwoven fabric layer (B), which has a large average single fiber diameter and the voids between the fibers in the nonwoven fabric layer, on the outermost layer, it is quickly converted to the nonwoven fabric layer (A). Since moisture transfers, quick-drying can be obtained on the outermost surface on the nonwoven fabric layer (B) side.

In the laminated nonwoven fabric of the present invention, it is important that the contact angle with water on the surface of the laminated nonwoven fabric is 30° or less, and the contact angle with water on the back surface of the laminated nonwoven fabric is 30° or less.

When the contact angle of the surface of the laminated nonwoven fabric with water is 30° or less, preferably 20° or less, and more preferably 10° or less, since the nonwoven fabric is hydrophilic, moisture in contact with the nonwoven fabric surface is easily absorbed by the nonwoven fabric, excellent It becomes a nonwoven fabric which has water absorption. When the contact angle of the back surface of the laminated nonwoven fabric with water is 30° or less, preferably 20° or less, and more preferably 10° or less, since the entire nonwoven fabric is hydrophilic, moisture in contact with the nonwoven fabric surface is easily absorbed by the nonwoven fabric, It becomes a nonwoven fabric with excellent water absorption. The lower limit of the contact angle with water in this invention is 0 degree. The 0 degree contact angle with water means the state in which all the water was absorbed by the nonwoven fabric in the following measuring method.

The contact angle with water can be controlled by the hydrophilicity of the thermoplastic resin used for the fibers constituting the laminated nonwoven fabric, or by application of the hydrophilic oil agent in the post-process. For example, the contact angle with water tends to become small, so that the hydrophilicity of a thermoplastic resin is high, and the adhesion amount of a hydrophilic oil agent is large.

The contact angle with water of the laminated nonwoven fabric layer in this invention points out the value measured and computed by the following method. The surface on which the nonwoven fabric layer (B) is laminated|stacked on the outermost surface is defined as a 1st surface, and the surface on the opposite side is defined as a 2nd surface.

(1) The laminated nonwoven fabric is left to stand in a room at a room temperature of 20°C and a relative humidity of 65% for 24 hours or more.

(2) The laminated nonwoven fabric subjected to the above treatment is set on a stage of a contact angle meter installed in the same room so that the nonwoven fabric layer (B) is the measurement surface.

(3) A droplet of 2 µL containing ion-exchanged water is prepared at the tip of a needle, and the liquid is deposited on the nonwoven fabric.

(4) A contact angle with a droplet is calculated|required from the image 2 second after a droplet lands on a nonwoven fabric. In addition, when all the water is absorbed by the nonwoven fabric within 2 seconds, it is determined that the interface between the droplets and the air is on the same surface as the surface of the nonwoven fabric layer, and the contact angle with water is defined as 0°.

(5) Change the measurement position for 1 level, measure 5 times, and let the arithmetic mean value be the contact angle of the 1st surface and water.

(6) Laminated nonwoven fabric subjected to the same treatment as (1) is set so that the nonwoven fabric layer (B) is on the back side, and the operations (2) to (5) are repeated, and the arithmetic mean value is calculated as the second side It is the contact angle of water.

In the laminated nonwoven fabric of the present invention, the ratio of the highest breaking strength σ _max to the lowest breaking strength σ _min among the breaking strengths measured by rotating within the plane of the laminated nonwoven fabric at 0° in any one direction and 180° every 22.5° It is preferable that (σ _max /σ _min , hereinafter simply abbreviated as breaking strength ratio in some cases) is 1.2 to 4.0. When the breaking strength ratio is preferably 1.2 or more, more preferably 1.3 or more, since the fibers are oriented in any direction within the surface of the nonwoven fabric, the moisture absorbed by the capillary effect can be expanded in the fiber orientation direction, more It becomes possible to obtain high absorption and quick-drying. In addition, when the breaking strength ratio is preferably 4.0 or less, more preferably 3.5 or less, the angle with extremely low breaking strength is eliminated, so that tearing of the nonwoven fabric during passage through a process or product processing can be suppressed. The breaking strength ratio of the laminated nonwoven fabric of the present invention is more preferably 1.3 to 3.5.

The breaking strength ratio of the laminated nonwoven fabric in the present invention refers to a value measured and calculated by the following method based on "6.3 tensile strength and elongation (ISO method)" of JIS L1913:2010 "General nonwoven fabric test method" .

(1) Set any one direction of the laminated nonwoven fabric to 0°, cut out a 300 mm long x 25 mm wide test piece so that the longitudinal direction coincides with the above direction, and change the location to take three test pieces.

(2) The test piece is set in a tensile tester with a holding interval of 200 mm.

(3) A tensile test is performed at a tensile speed of 100 m/min, and the tensile strength [N] at break is determined for the three sampled specimens, and the arithmetic average value is defined as the breaking strength σ.

(4) A test piece of 300 mm in length x 25 mm in width was prepared so that the longitudinal direction coincides with the axial direction with the axis rotated 22.5° clockwise within the plane of the laminated nonwoven fabric with respect to any one direction set to 0°. Cut, change the location, and take 3 specimens. Thereafter, the operations (2) to (3) are performed to calculate the breaking strength σ.

(5) The operation of the above (4) is repeated until the in-plane rotation angle of the laminated nonwoven fabric becomes 180°, and the breaking strength σ at each angle is calculated.

(6) Among the breaking strengths σ calculated by the above method, the ratio (σ _max /σ _min ) of the highest breaking strength σ _max to the lowest breaking strength σ _min is calculated, and it is set as the breaking strength ratio of the laminated nonwoven fabric.

The laminated nonwoven fabric of the present invention may contain nonwoven fabric layers other than the nonwoven fabric layer (A) and the nonwoven fabric layer (B) as long as the effects of the present invention are not impaired. When the nonwoven fabric layer (A) and the nonwoven fabric layer (B) other than the nonwoven fabric layer are included, it is preferable that the fibers constituting the nonwoven fabric layer be hydrophilic from the viewpoint of not impairing water absorbency.

In the laminated nonwoven fabric of the present invention, in addition to the nonwoven fabric layer (B) being laminated on one outermost surface, it is preferable that the nonwoven fabric layer (A) is laminated on the other outermost surface. By laminating the nonwoven fabric layer (A) on the other outermost surface, it becomes easy to transfer the absorbed moisture to the substance in contact with the nonwoven fabric layer (A). For example, in uses, such as a diaper, it becomes easy to transfer water|moisture content to an absorber, and the quick-drying property of a laminated nonwoven fabric improves.

In the laminated nonwoven fabric of the present invention, it is preferable that the water absorption rate measured from the first surface on which the nonwoven fabric layer (B) is disposed on the outermost surface is 20 seconds or less. By setting the absorption rate to preferably 20 seconds or less, more preferably 15 seconds or less, and still more preferably 10 seconds or less, a nonwoven fabric having good performance for removing moisture adhering to the surface, that is, excellent water absorption, is obtained.

The water absorption rate here is measured based on "7.1.1 dripping method" of JIS L1907:2010 "absorption test method of textile products". One drop of water is added dropwise to the laminated nonwoven fabric, and the time from absorption to disappearance of the specular reflection on the surface is measured. Let the value rounded off be the absorption rate in the present invention.

It is preferable that the weight per unit area of the laminated nonwoven fabric of this invention shall be 10 g/m<2> - 100 g/m<2>. By setting the weight per unit area to preferably 10 g/m 2 or more, more preferably 13 g/m 2 or more, and still more preferably 15 g/m 2 or more, a laminated nonwoven fabric having a mechanical strength that can be applied to practical use can be obtained. In addition, when the weight per unit area is preferably 100 g/m 2 or less, more preferably 50 g/m 2 or less, a laminated nonwoven fabric having adequate flexibility suitable for use as a nonwoven fabric for sanitary materials can be obtained. The weight per unit area of the laminated nonwoven fabric of the present invention is more preferably 13 g/m 2 to 50 g/m 2 .

The weight per unit area (g/m2) of the laminated nonwoven fabric in the present invention is based on the "mass per 6.2 unit area" of JIS L1913:2010 "General nonwoven fabric test method", a 20 cm x 25 cm test piece is a sample 3 sheets are sampled per 1 m of width, and each mass (g) in a standard state is measured, and the mass per 1 m2 calculated from the average value shall be pointed out.

As for the laminated nonwoven fabric of this invention, it is preferable that these nonwoven fabric layer (A) and nonwoven fabric layer (B) are integrated. Integration as used herein means that these layers are joined by entanglement of fibers, fixation with components such as an adhesive, and fusion of thermoplastic resins constituting the respective layers.

In the laminated nonwoven fabric of the present invention, preferably, both the nonwoven fabric layer (A) and the nonwoven fabric layer (B) contain a long fiber nonwoven fabric.

The laminated nonwoven fabric of this invention may provide a hydrophilicizing agent for the purpose of making water absorptivity higher. Although surfactant etc. are mentioned as a kind of hydrophilizing agent, Especially, a nonionic surfactant is preferable.

[sanitary material]

The sanitary material of the present invention is at least partially constituted by the above-described laminated nonwoven fabric. By doing in this way, a sanitary material excellent in water absorption and quick drying is obtained. Moreover, the sanitary material of this invention is mainly a disposable article used for health-related purposes, such as medical care and nursing care, for example. The sanitary material of the present invention includes a paper diaper, a sanitary napkin, gauze, a bandage, a mask, a glove, a band-aid, and the like, and its constituent members, for example, a top sheet of a paper diaper, a back sheet, a side gather, and the like are also included.

Among them, the sanitary material in which the outermost surface of the side on which the nonwoven fabric layer (B) is laminated faces the wearer's skin side can immediately absorb moisture adhering to the skin surface side into the inside of the laminated nonwoven fabric, , since discomfort to the wearer can be reduced, it is more preferable.

For example, when the sanitary material is a paper diaper and the laminated nonwoven fabric is used for the top sheet of the paper diaper, the outermost surface of the side on which the nonwoven fabric layer (B) is laminated is disposed toward the wearer's skin side. When it is worn, sweat or excreted urine generated during wearing is quickly absorbed, and the liquid is rapidly transferred to the nonwoven fabric layer (A), and the surface can be maintained in a dry state without excessive moisture.

When the sanitary material is a mask and the laminated nonwoven fabric is used for the inner layer of the mask, when the outermost surface on the side on which the nonwoven fabric layer (B) is laminated is disposed toward the wearer's skin side, sweat or exhalation is Even if moisture is attached to the skin surface due to condensation, it is absorbed directly into the laminated nonwoven fabric, and the skin surface can be maintained in a dry state without excessive moisture.

[Method for producing laminated nonwoven fabric]

Next, a preferred embodiment for producing the laminated nonwoven fabric of the present invention will be specifically described.

The manufacturing method of the nonwoven fabric layer (A) and the nonwoven fabric layer (B) which comprise the laminated nonwoven fabric of this invention can be selected from well-known manufacturing methods, such as a spun bond method, a melt blow method, and the short fiber card method.

Especially, since it is excellent in productivity, the spunbonding method is mentioned as a preferable method.

Hereinafter, although the preferable aspect which manufactures the laminated nonwoven fabric of this invention based on a spun bonding method is demonstrated, it is not limited to this.

The spunbond method is a method of melting a thermoplastic resin as a raw material, spinning it from a spinneret, pulling and drawing a yarn obtained by cooling and solidifying with an ejector, collecting it on a moving net to form a nonwoven fiber web, and then thermal bonding. It is a manufacturing method of a nonwoven fabric which requires a process.

In the spunbonding method, various shapes such as a circle or a rectangle can be adopted as the shape of the spinneret and ejector used. Especially, it is preferable to use the combination of a rectangular nozzle and a rectangular ejector from a viewpoint that the usage-amount of compressed air is comparatively small, and the fusion|fusion or abrasion of threads does not occur easily.

When manufacturing the laminated nonwoven fabric of this invention, it is preferable to make the spinning temperature into (melting temperature of the thermoplastic resin which is a raw material +10 degreeC) or more (melting temperature of the thermoplastic resin which is a raw material +100 degreeC) or less. By making the spinning temperature within the above range, it is possible to obtain a stable molten state and excellent spinning stability.

The discharged thread is cooled next. As a method of cooling the discharged thread, for example, a method of forcibly blowing cold air to the thread, a method of natural cooling at the ambient temperature around the thread, and a method of adjusting the distance between the spinneret and the ejector are mentioned. , or a method combining these methods may be employed. In addition, cooling conditions can be suitably adjusted in consideration of the discharge amount per single hole of a spinneret, the temperature to spin, atmospheric temperature, etc.

Next, the cooled and solidified thread is drawn and stretched by compressed air sprayed from the ejector.

In the laminated nonwoven fabric of the present invention, it is important to control the average single fiber diameter of the fibers constituting the nonwoven fabric layer (A) and the nonwoven fabric layer (B).

The average single fiber diameter of the fiber is determined by the discharge amount per discharge hole of the spinneret and the pulling speed, that is, the spinning speed. For this reason, it is preferable to determine the discharge amount and the spinning speed according to the desired average single fiber diameter.

In a spinning speed, it is preferable that it is 2000 m/min or more, More preferably, it is 3000 m/min or more. By setting the spinning speed to 2000 m/min or more, high productivity is obtained, and the orientation and crystallization of the fibers proceeds to obtain long fibers of high strength.

The long-fiber yarns drawn by traction in this way are collected by a moving net to form a sheet, and then are subjected to a thermal bonding process.

The laminated nonwoven fabric of the present invention is a laminated nonwoven fabric obtained by laminating at least one nonwoven fabric layer (A) and a nonwoven fabric layer (B), respectively. As a method of laminating two nonwoven fabric layers, for example, on a nonwoven fabric layer obtained by collecting a first thermoplastic resin fiber by a spun bonding method on a collecting net, a second thermoplastic resin fiber obtained by collecting a second thermoplastic resin fiber by a spun bonding method A method of continuously collecting nonwoven fabric layers in-line and laminating and integrating, a method of overlapping separately obtained nonwoven fabric layer (A) and nonwoven fabric layer (B) offline, and laminating and integrating by thermocompression bonding or the like can be adopted. Among them, from the viewpoint of excellent productivity, the nonwoven fabric layer obtained by collecting the second thermoplastic resin fibers by the spunbonding method on the nonwoven fabric layer obtained by collecting the first thermoplastic resin fibers by the spunbonding method on the collecting net is inlined. A method of continuously collecting and integrating by thermal bonding is preferable.

As a method of laminating and integrating the laminated nonwoven fabric of the present invention by thermal bonding, it is different from a heat embossed roll in which a pair of upper and lower roll surfaces are engraved (concave-convex portions), and a roll having a flat (smooth) surface on one side. Thermal bonding by various rolls, such as a thermal embossing roll including a combination of rolls in which engraving (concave-convex portions) is applied to the roll surface on the side, and a thermal calendering roll including a combination of a pair of upper and lower flat (smooth) rolls method or a method by thermocompression bonding such as ultrasonic bonding in which thermal welding is performed by ultrasonic vibration of the horn can be employed.

When the laminated nonwoven fabric of this invention is manufactured by thermocompression bonding, since a several nonwoven fabric layer fully adhere|attaches and the mechanical strength of a laminated nonwoven fabric increases, it is preferable.

As a method of laminating and integrating the laminated nonwoven fabric of the present invention by thermal bonding, a so-called air-through method, which is a method of blowing hot air, is exemplified. When the laminated nonwoven fabric of this invention is manufactured by the air-through method, since it is bulky and is excellent in a texture, it is preferable.

You may provide a hydrophilicizing agent before winding-up with respect to the laminated nonwoven fabric obtained in this way. As a method of providing the hydrophilicizing agent to the laminated nonwoven fabric, application by a kiss roll or spray, dip coating, or the like can be given. As for the method of providing the hydrophilicizing agent to the laminated nonwoven fabric, application by a kiss roll is preferable from the viewpoint of uniformity and easiness of controlling the amount of adhesion.

In the laminated nonwoven fabric of the present invention, the nonwoven fabric layer (B) should just be laminated on at least one of the outermost surfaces, and as for the number and combination of the layers, any configuration can be adopted according to the purpose.

Example

Next, the present invention will be described in detail based on Examples. However, the present invention is not limited only to these Examples. In addition, in the measurement of each physical property, if there is no special description, the measurement was performed based on the above-mentioned method.

(1) Ratio (Db/Da) of the average short fiber diameter Db of the second thermoplastic resin fiber to the average short fiber diameter Da of the first thermoplastic resin fiber

For each thermoplastic resin fiber, a fiber sample was randomly sampled with the nonwoven fiber web collected on the net, and the cross section of the fiber was measured with a scanning electron microscope "S-5500" manufactured by Hitachi High Technologies, Inc. Images were taken at a magnification that could be observed. Then, using "WinROOF2015" manufactured by Mitani Shoji Co., Ltd. as image analysis software, the area Af formed by the cross-sectional outline of the single fiber was measured, and the diameter of a perfect circle having the same area as this area Af was calculated. This was measured for 20 single fibers arbitrarily extracted from the same nonwoven fabric layer, a simple number average was obtained, the unit was μm, the second decimal place was rounded off, and the average single fiber diameter was obtained.

(2) contact angle with water of laminated nonwoven fabric

It measured as follows using the contact angle meter "DMo-501" made by Kyowa Chemical Co., Ltd. as follows.

Laminated nonwoven fabric layer of the present invention WHEREIN: The surface on which the nonwoven fabric layer (B) was laminated|stacked on the outermost surface was defined as a 1st surface, and the surface on the opposite side was defined as a 2nd surface, and it measured and calculated by the following method.

(2.1) The laminated nonwoven fabric was left to stand in a room at a room temperature of 20°C and a relative humidity of 65% for 24 hours.

(2.2) The laminated nonwoven fabric subjected to the above treatment was set on a stage of a contact angle meter installed in the same room so that the nonwoven fabric layer (B) was the measurement surface.

(2.3) A droplet of 2 µL containing ion-exchanged water was prepared at the tip of the needle, and the liquid was deposited on the nonwoven fabric.

(2.4) The contact angle with the droplet was determined from the image 2 seconds after the droplet landed on the nonwoven fabric. In addition, when all the water was absorbed into the nonwoven fabric within 2 seconds, it was determined that the interface of the droplets with air was on the same surface as the surface of the nonwoven fabric layer, and the contact angle with water was defined as 0°.

(2.5) The measurement position was changed for 1 level, measurement was performed 5 times, and the arithmetic mean value was made into the contact angle of the 1st surface and water.

(2.6) The laminated nonwoven fabric subjected to the same treatment as in (2.1) is set so that the nonwoven fabric layer (B) is on the back side, and the operations (2.2) to (2.5) are repeated, and the arithmetic mean value is calculated as the second side. and the contact angle of water.

(3) Break strength ratio (σ _max /σ _min )

It measured as follows using the tensile tester "Tensilon UCT100" manufactured by Orientec Corporation.

The breaking strength ratio of the laminated nonwoven fabric in the present invention was measured and calculated by the following method based on "6.3 tensile strength and elongation (ISO method)" of JIS L1913:2010 "General nonwoven fabric test method".

(3.1) An arbitrary one direction of the laminated nonwoven fabric was set to 0°, and a test piece measuring 300 mm in length × 25 mm in width was cut out so that the longitudinal direction coincided with the above direction, and the location was changed and three test pieces were collected.

(3.2) The test piece was set in a tensile tester with a holding interval of 200 mm.

(3.3) A tensile test was carried out at a tensile speed of 100 m/min, and the tensile strength [N] at break was determined for the three sampled specimens, and the arithmetic average value was defined as the breaking strength σ.

(3.4) With respect to an arbitrary direction set to 0°, with the axis rotated 22.5° clockwise within the plane of the laminated nonwoven fabric, a specimen measuring 300 mm in length × 25 mm in width was taken so that the longitudinal direction coincides with the axial direction. Cut, change the location, and take 3 specimens. Thereafter, the operations (3.2) to (3.3) were performed to calculate the breaking strength σ.

(3.5) The operation of (3.4) was repeated until the in-plane rotation angle of the laminated nonwoven fabric became 180°, and the breaking strength σ at each angle was calculated.

(3.6) Among the breaking strengths σ calculated by the above method, the ratio of the highest breaking strength σ _max to the lowest breaking strength σ _min ( σ _max /σ _min ) was calculated, and it was set as the breaking strength ratio of the laminated nonwoven fabric.

(4) absorption rate

The surface on which the nonwoven fabric layer (B) was disposed on the outermost surface was measured as follows.

It measured based on "7.1.1 dripping method" of JIS L1907:2010 "the water absorption test method of textiles". One drop of water is added dropwise to the laminated nonwoven fabric, and the time from absorption to disappearance of the specular reflection on the surface is measured. The value rounded off was made into the absorption rate.

(5) quick drying

In the laminated nonwoven fabric, one drop of water is dripped onto the surface of the nonwoven fabric layer (B), and a healthy general adult (15 male and female 30 people in total) touches the surface after 1 minute has elapsed, and the following 3 steps was evaluated as For each nonwoven fabric, the average point of the evaluation results was calculated, and it was set as the feel of the laminated nonwoven fabric.

5: The surface is dry and does not feel moisture

3: There is no moisture on the surface, but it is moist

1: There is moisture on the surface, and it is moist.

[Example 1]

(Non-woven fabric layer (A))

Polypropylene (PP) was melted with an extruder, and discharged at a single hole discharge rate of 0.56 g/min from a rectangular spinneret having round holes having a hole diameter of 0.4 mmφ. After the discharged yarn was cooled and solidified by cold air, it was pulled and stretched by compressed air at a pressure in the ejector of 0.08 MPa in a rectangular ejector, and collected on a moving net to obtain a nonwoven fibrous web. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (A) was 15.5 µm.

(Non-woven fabric layer (B))

Polypropylene (PP) was melted with an extruder, and discharged at a single hole discharge rate of 1.30 g/min from a rectangular nozzle having round holes having a hole diameter of 0.4 mm phi . After the discharged yarn was cooled and solidified, it was pulled and stretched by compressed air at a pressure in the ejector of 0.10 MPa in a rectangular ejector, and collected on a moving net to obtain a nonwoven fibrous web. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (B) was 24.5 µm.

(laminated non-woven fabric)

By collecting the nonwoven fabric layer (B) directly on the nonwoven fabric layer (A) obtained above (referred to as “inline” for the lamination method in Table 1), a two-layer structure of a spunbonded nonwoven fabric layer and a spunbonded nonwoven fabric layer A laminated fiber web of (in Table 1, "A/B" is indicated for the laminated structure) was obtained.

The laminated fiber web thus obtained was heated by using a metal emboss roll in which circular convex portions were zigzag arranged in both directions of MD and CD on the upper roll, and a metal flat roll on the lower roll. Using an embossing roll having a mechanism, the linear pressure was 300 N/cm and the thermal bonding temperature was 125° C. to obtain a laminated nonwoven fabric having a weight per unit area of 40 g/m 2 . Thereafter, as a hydrophilic treatment, a nonionic surfactant was applied to the nonwoven fabric using a kiss roll so that the active ingredient was 0.5 wt% based on the weight of the laminated nonwoven fabric.

About the obtained laminated nonwoven fabric, the average short fiber diameter ratio (Db/Da), the contact angle of the laminated nonwoven fabric with water, the breaking strength ratio (σ _max /σ _min ), the water absorption rate, and the absorption quick-drying property were evaluated. The results are shown in Table 1.

[Example 2]

In the manufacturing method of the nonwoven fabric layer (B), a laminated nonwoven fabric was obtained in the same manner as in Example 1 except that the single hole discharge amount was changed to 0.90 g/min. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (B) was 20.4 µm. Table 1 shows the evaluation results of the obtained laminated nonwoven fabric.

[Comparative Example 1]

In the manufacturing method of the nonwoven fabric layer (B), a laminated nonwoven fabric was obtained in the same manner as in Example 1 except that the nonwoven fabric layer (B) was obtained under the same conditions as the nonwoven fabric layer (A). The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (A) was 24.5 µm. Table 1 shows the evaluation results of the obtained laminated nonwoven fabric.

[Example 3]

In the manufacturing method of laminated nonwoven fabric, after collecting the nonwoven fabric layer (C) obtained by the following method on the nonwoven fabric layer (A), a laminated nonwoven fabric was obtained in the same manner as in Example 1 except that the nonwoven fabric layer (B) was collected. . Table 1 shows the evaluation results of the obtained laminated nonwoven fabric.

(Non-woven fabric layer (C))

Polypropylene (PP) was melted with an extruder, and discharged at a single hole discharge rate of 0.90 g/min from a rectangular spinneret having round holes having a hole diameter of 0.4 mm phi . After the discharged yarn was cooled and solidified, it was pulled and stretched by compressed air at a pressure in the ejector of 0.10 MPa in a rectangular ejector, and collected on a moving net to obtain a nonwoven fibrous web. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (B) was 20.4 µm.

[Example 4]

The fibers of the nonwoven fabric layer (A) were collected on a conveyor in the same manner as in Example 1, and thermal bonding was performed in the same manner as in Example 1 to obtain a nonwoven fabric layer (A). Similarly for the nonwoven fabric layer (B), the fibers of the nonwoven fabric layer (B) were collected on a conveyor in the same manner as in Example 1, and thermally bonded in the same manner as in Example 1, and the nonwoven fabric layer (B) was got it The nonwoven fabric layer (A) and the nonwoven fabric layer (B) thus obtained were laminated (in Table 1, the lamination method is described as "offline"), and a laminated nonwoven fabric was obtained by thermal bonding in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained laminated nonwoven fabric.

[Comparative Example 2]

The manufacturing method of a laminated nonwoven fabric WHEREIN: A laminated nonwoven fabric was obtained by the method similar to Example 1 except not giving a hydrophilic process. The contact angle with water was large. Table 2 shows the evaluation results of the obtained laminated nonwoven fabric.

[Example 5]

The polymer used for the nonwoven fabric layer (A) and the nonwoven fabric layer (B) was made into polyethylene terephthalate (copolymerized PET) copolymerized with polyethylene glycol at 8 wt%, to obtain a laminated nonwoven fabric by the following method. Table 2 shows the evaluation results of the obtained laminated nonwoven fabric.

(Non-woven fabric layer (A))

A nonwoven fibrous web was obtained in the same manner as in Example 1 except that the polymer was used as copolymerized PET. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (A) was 12.5 µm.

(Non-woven fabric layer (B))

A nonwoven fibrous web was obtained in the same manner as in Example 1 except that the polymer was used as copolymerized PET. The average single fiber diameter of the fibers constituting the obtained nonwoven fabric layer (B) was 19.8 µm.

(laminated non-woven fabric)

A laminated nonwoven fabric was obtained in the same manner as in Example 1, except that the thermal bonding temperature was set to 200°C and hydrophilic processing was not performed.

[Comparative Example 3]

Using the nonwoven fabric layer (A) obtained in the same manner as in Example 5 for the nonwoven fabric layer (A), a laminated nonwoven fabric was obtained in the same manner as in Example 1 except that hydrophilic processing was not performed in the manufacturing method of the laminated nonwoven fabric. . The contact angle with water of the first surface was large. Table 2 shows the evaluation results of the obtained laminated nonwoven fabric.

[Example 6]

With respect to the polymer used for the nonwoven fabric layer (A), polyethylene terephthalate (copolymerized PET) and polyamide 6 (PA6) obtained by copolymerizing 8 wt% of polyethylene glycol were used, except that the nonwoven fabric layer (A) was obtained by the following method, A laminated nonwoven fabric was obtained in the same manner as in Example 1. Table 2 shows the evaluation results of the obtained laminated nonwoven fabric.

(Non-woven fabric (A))

Each of copolymerized PET and Ny6 was melted with an extruder, and discharged from a hollow 24 split half-sum composite rectangular nozzle at a single hole discharge rate of 0.56 g/min. After the discharged yarn was cooled and solidified by cold air, it was pulled and stretched by compressed air at a pressure in the ejector of 0.08 MPa in a rectangular ejector, and collected on a moving net to obtain a nonwoven fibrous web. In the obtained nonwoven fabric layer (A), one fiber was partially divided into a plurality of fibers, and the average single fiber diameter of the fibers after division was 3.1 µm.

Examples 1 to 6 have a large average single fiber diameter ratio (Da/Db) and a small contact angle with water on the front and back surfaces of the laminated nonwoven fabric. , it can be seen that it has an excellent absorption rate and absorption quick-drying properties.

On the other hand, in Comparative Example 1, since the average short fiber diameter ratio was small, moisture did not migrate to the nonwoven fabric layer (A) side in the nonwoven fabric, and the absorption quick-drying property was inferior. Further, in Comparative Examples 2 and 3, since hydrophobic fibers were used for part or all of the laminated nonwoven fabric, the contact angle with water on the first surface was increased, and the absorption rate became slow and the absorption quick-drying property was also deteriorated.

The laminated nonwoven fabric of the present invention has sufficient absorption and quick-drying properties for use as a nonwoven fabric for sanitary materials. By using the laminated nonwoven fabric of the present invention as at least a part of the sanitary material, it is possible to obtain a sanitary material having excellent water absorption and excellent quick-drying properties.

The laminated nonwoven fabric of the present invention can be used as a part of hygiene materials such as paper diapers, sanitary napkins, gauze, bandages, masks, gloves, and bandages.

Claims (6)

The nonwoven fabric layer (A) containing the first thermoplastic resin fibers and the nonwoven fabric layer (B) containing the second thermoplastic resin fibers are each laminated in at least one layer, and the average of the fibers constituting the nonwoven fabric layer (A) The ratio (Db/Da) of the average single fiber diameter Db of the fibers constituting the nonwoven fabric layer (B) to the single fiber diameter Da is 1.1 or more, the nonwoven fabric layer (B) is laminated on at least one outermost surface, and , Laminated nonwoven fabric, wherein the contact angle with water on the surface of the laminated nonwoven fabric is 30 degrees or less, and the contact angle with water on the back surface of the laminated nonwoven fabric is 30 degrees or less. The laminated nonwoven fabric according to claim 1, wherein in the laminated nonwoven fabric, the nonwoven fabric layer (A) is laminated on the other outermost surface. 3. The laminated nonwoven fabric according to claim 1 or 2, wherein the lowest breaking strength σ _min among the breaking strengths measured by rotating the laminated nonwoven fabric in a plane by 180° every 22.5° with 0° in any one direction. A laminated nonwoven fabric having a ratio of the highest breaking strength σ _max to (σ _max /σ _min ) of 1.2 to 4.0. The laminated nonwoven fabric according to any one of claims 1 to 3, wherein the nonwoven fabric layer (A) and the nonwoven fabric layer (B) both contain a long fiber nonwoven fabric. A sanitary material comprising at least a part of the laminated nonwoven fabric according to any one of claims 1 to 4. The sanitary material according to claim 5, wherein the outermost surface of the side on which the nonwoven fabric layer (B) is laminated is disposed toward the wearer's skin side.