TW201732107A - Hydrophilic bulky nonwoven fabric - Google Patents

Abstract

Provided is a hydrophilic bulky nonwoven fabric that has excellent water permeability and is suitable as a surface material for a hygienic good such as the top sheet of a diaper in particular. This hydrophilic bulky nonwoven fabric comprises a thermoplastic fiber and is characterized by: having a nonwoven fabric surface structure in which, when a unit section is defined in an X-direction and Y-direction with a measurement reference length in the surface of the nonwoven fabric being set to 100 [mu]m, the proportion of the sections where the maximum height within the unit section is 30% or greater with respect to the height (thickness) of said nonwoven fabric while no load is being applied in a Z-direction, accounts for 50% or greater per 40000 sections which correspond to a surface area of 20 mm * 20 mm of the nonwoven fabric; having a permeable flow length value of not more than 25 mm at a 45 DEG inclination; and having a fourth-time permeability index of at least 85%.

Description

Hydrophilic fluffy non-woven fabric

The present invention relates to a hydrophilic fluffy nonwoven fabric which absorbs urine or body fluids without residue, particularly when used as a surface material for a sanitary material or the like.

In recent years, the discarding type has become significantly more popular, and the required quality or performance has been increasing. For the non-woven fabric to be used as the top sheet of the diaper, it is required to pass the body fluid and further move the body fluid passing through to the performance (water permeability) of the absorbent body. A raw material which is commonly used as a raw material of a top sheet which is required to be water-permeable is a hydrophobic polyolefin-based nonwoven fabric, and a water-permeable agent is applied as a water-permeable agent to impart water permeability. In order to improve the water permeability, for example, in the following Patent Document 1, a method of modifying the water permeable agent is often used to improve the water permeability. For the improvement of water permeability, it is necessary to select a surfactant having a higher activity. Therefore, when used as a surface material of a sanitary material, it is likely to cause a rash or eczema on the surface of the skin to be contacted, and the skin is stimulated. Poor in terms of sex. On the other hand, in the following Patent Document 2, by forming a nonwoven fabric, the structure of the surface of the nonwoven fabric is made into a concave-convex structure, the contact area with the skin is reduced, and the rewet performance as an index of water permeability is improved. Durable water permeability. However, in order to impart a concave-convex structure, it is necessary to perform processing such as special embossing, so that the manufacturing cost is increased and the productivity is not high. Further, since the thickness is reduced by the embossing between the rolls, the effect of improving the water permeability obtained is not remarkable. Moreover, in the following patent document 3, the non-woven fabric is subjected to the uneven processing to improve the introduction of the body fluid. However, this method has concerns about giving the skin a moist touch. In the case where a flat-shaped non-woven fabric is used as a surface sheet of a diaper or a physiological article, the entire surface of the non-woven fabric is brought into contact with a mixture of the pulp and the polymer absorbent body which is an absorbent body located at a lower portion of the surface sheet. When a diaper or a physiological product is worn, the user's body weight is applied to the surface sheet and the absorbent body, and the nonwoven fabric as the surface sheet is in closer contact with the absorbent body, so that the body fluid adhering to the surface of the nonwoven fabric can be quickly moved to the absorbent body, but When a non-woven fabric having a concave-convex shape and a cavity inside the convex portion is used as the surface sheet, the convex portion of the nonwoven fabric is not in contact with the absorber. Therefore, when the body fluid adheres to the surface of the nonwoven fabric, it is difficult to rapidly move the body fluid to the absorber. Further, since the body fluid adhering to the convex portion is always held inside the non-woven fabric due to the surface tension, the skin may be rendered moist. Further, in the case of urinating, if the nonwoven fabric is in a flat shape, the urine is treated on the entire surface of the non-woven fabric. However, in the case of the non-woven fabric having the uneven shape, the urine concentrates on the concave portion which easily flows. That is, the amount of urine flowing into the concave portion is larger than that of the convex portion, and the water-permeable agent adhering to the concave portion is washed away by the urine. If the water permeable agent of the recess is washed away by the urine, since the urine stays in the concave portion, it is possible to impart a moist touch to the wearer. Further, there is a concern that as time passes, the urine remaining in the concave portion evaporates to cause a rash or eczema on the surface of the skin. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

[Problems to be Solved by the Invention] In view of the above circumstances, the problem to be solved by the present invention is to provide a hydrophilic fluffy nonwoven fabric which is excellent in water permeability and is suitable for a surface material of a sanitary material such as a top sheet of a diaper. [Technical means for solving the problem] As described above, in order to exhibit excellent water permeability, the design of the surfactant and the surface structure of the nonwoven fabric to be imparted as a water permeable agent become important. In particular, when the surface of the nonwoven fabric is a rough structure having fine unevenness, when a body fluid such as urine or sweat adheres to the surface of the nonwoven fabric, the surface structure becomes coarser, and the contact angle between the body fluid and the surface of the nonwoven fabric is smaller, and the body fluid is more easily introduced into the body. Not woven inside. The inventors of the present invention have focused on the fine structure of the surface of the non-woven fabric, and have conducted research on the number of crimps of the fibers of the long-fiber non-woven fabric, the joining method, and the method of permeable to water, and as a result, the fibers are disposed in an appropriate range by development. The present invention has been completed by continuously improving the water-permeable 45-degree inclined flow length value and the durable water permeability index which become the water permeability index. That is, the present invention is as follows. [1] A hydrophilic fluffy nonwoven fabric comprising a thermoplastic fiber and having the following non-woven surface structure, that is, when the measurement reference length on the surface of the nonwoven fabric is 100 μm, the X direction is the Y direction. The ratio of the maximum height in the defined unit block to the height (thickness) of 30% or more when the load is not loaded in the Z direction of the non-woven fabric is equal to the number of 40,000 blocks corresponding to the surface area of the nonwoven fabric of 20 mm × 20 mm. The middle is 50% or more, and the non-woven fabric has a 45 degree sloping flow length of 25 mm or less, and the fourth durability permeable index is 85% or more. [2] The hydrophilic fluffy nonwoven fabric according to the above [1], wherein the hydrophilic fluffy nonwoven fabric has an alignment index in the thickness direction obtained by X-ray CT (Computed Tomography) of 0.43 or less. [3] The hydrophilic bulky nonwoven fabric according to the above [1] or [2], wherein the hydrophilic bulky nonwoven fabric has a compressive work amount of 0.20 gf·cm/cm ² or more and 1.00 gf·cm/cm ² or less. [4] The hydrophilic fluffy nonwoven fabric according to any one of the above [1] to [3] wherein the number of the fibers constituting the hydrophilic fluffy nonwoven fabric is 5 to 45 / 2.54 cm (吋). [5] The hydrophilic fluffy nonwoven fabric according to any one of [1] to [4] wherein the thermoplastic fiber is a side-by-side or eccentric sheath-core type composite fiber. [6] The hydrophilic fluffy nonwoven fabric according to any one of [1] to [5] wherein the thermoplastic fiber is a polyolefin-based fiber. [7] The hydrophilic fluffy nonwoven fabric according to any one of [1] to [6] wherein the thermoplastic fiber is a long fiber. [8] A sanitary material obtained by using the hydrophilic fluffy nonwoven fabric according to any one of the above [1] to [7]. [Effects of the Invention] The hydrophilic fluffy nonwoven fabric of the present invention has excellent water permeability, and thus can be preferably used as a top sheet of a sanitary material such as a surface of a sanitary napkin, an incontinence pad, a disposable diaper, or the like, and further, for example, It can also be used for masks, furnaces, tape backings, patching cloths, wounds, bottoms, packaging materials, wiping products, medical robes, bandages, clothing, skin care sheets, etc.

Hereinafter, embodiments of the present invention will be described in detail. The nonwoven fabric of the present embodiment contains thermoplastic fibers, and can be a long-fiber nonwoven fabric produced by a spunbonding method or a short-fiber nonwoven fabric produced by a carding method or the like. However, in the case of a short fiber non-woven fabric, the fiber is pulled in the X direction or the Y direction during the carding, and the surface is easily smoothed, and the viewpoint of the situation, the strength, the productivity, and the stimulation of the skin are reduced. In other words, as the fibers constituting the woven fabric, long fibers produced by a spunbonding method are preferred. In the present specification, the term "long fiber" means a fiber having a fiber length of 55 mm or more. The shorter the fiber length, the greater the probability that the end portion of the fiber will contact the skin, so that the tactile sensation is given, so the fiber length is preferably 55 mm or more. Examples of the thermoplastic resin constituting the thermoplastic fiber include polyolefin resins such as polyethylene, polypropylene, and copolymerized polypropylene, and polyethylene terephthalate, polybutylene terephthalate, and polynaphthalene dicarboxylic acid. Polyester resin such as ethylene glycol or copolymerized polyester, polyamine resin such as nylon-6, nylon-66, copolymerized nylon, and polylactic acid, polybutylene succinate, and polybutyl succinate The biodegradable resin such as an ester is not particularly limited. The viewpoint of the texture of the non-woven fabric and the use of the fabric are mostly disposable materials. From the viewpoint of versatility and convenience of recycling, a polyolefin resin is preferred. As a form of the thermoplastic fiber, it is preferable that the fiber is crimped from the viewpoint of imparting characteristics to the surface structure of the nonwoven fabric. The number of crimps is preferably 5 pieces/2.54 cm (吋) or more, more preferably 5 pieces/吋 or more and 45 pieces/吋 or less, further preferably 10 pieces/吋 or more and 40 pieces/吋 or less, and particularly preferably 10 / 吋 or more and 25 / 吋 or less. In the case of a non-woven fabric composed of fibers having a crimping number of more than 45/inch, the shortening or unevenness of the crimping of the fibers is conspicuous, resulting in deterioration of the appearance of the nonwoven fabric, and deterioration of the bleed index due to unevenness. . Further, in the case of a non-woven fabric composed of fibers having a crimping number of less than 5 Å, the desired surface roughness cannot be obtained, the thickness is reduced, the texture is impaired, or the desired water permeability is difficult to obtain. As a method of crimping the above-mentioned fibers, the fiber cross-section can be crimped by setting the cross section of the fiber into a cross-sectional shape and cooling it while the spinning is cooled. Further, the composite fiber containing two or more kinds of thermoplastic resins may exhibit curling, and the composition thereof may be made into a side-by-side type (S/S) or a eccentric sheath type (partial S/C). The ground shows a curl. In the case of the eccentric sheath type (S/C), the core may also be exposed on the surface of the fiber, and the ratio of the core to the surface of the fiber is preferably 0 to 50%, more preferably 0. ~30%. If the ratio of the core portion to the surface of the fiber is as high as more than 50%, the adhesion of the nonwoven fabric is affected, and the strength of the cloth is liable to be lowered, and fluffing is likely to occur. In the case of the eccentric sheath core type (S/C), in order to obtain the desired number of crimps, the center of gravity of the cross-sectional area of the core is preferably shifted by 5 to 40 with respect to the center of gravity of the cross-sectional area of the composite fiber. %. The offset of the core is calculated by the following formula. Offset (%) of the core = (the shortest distance between the center of gravity of the cross-sectional area of the composite fiber and the center of gravity of the cross-section of the core) / (diameter of the wire) × 100 The fiber system is composed of two or more thermoplastic resins. In the case of the above, as long as the desired effect can be exerted, it is preferred that any combination of the above thermoplastic resins is a combination of thermoplastic resins having a difference in melting point from the viewpoint of bonding the fibers to each other. The weight ratio of the resin having a higher difference in melting point to the fiber is preferably 20% by weight or more and 80% by weight or less, more preferably 30% by weight or more and 80% by weight or less, further preferably 50% by weight or more and 70% or more Below wt%. Moreover, from the viewpoint of the texture of the nonwoven fabric to be obtained, it is preferred to use a combination of a polyolefin resin and a polyolefin resin in combination with a polyester resin. When a polyolefin resin is used in combination, a composite fiber obtained by combining a resin such as polyethylene, polypropylene, or a copolymer of these monomers with other α-olefins may be mentioned. The other α-olefin is a carbon number of 3 to 10, and specific examples thereof include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, and 1-octene. When a polyolefin resin and a polyester resin are combined, it is preferable to use a polyethylene terephthalate single component or a copolymer containing isophthalic acid or the like. Further, polyethylene terephthalate may be modified by a blend or the like, or an additive or the like may be added. Among them, the combination of the thermoplastic resin is preferably strong in strength and is not easily broken at the time of use, and is excellent in processability in producing a sanitary material, and in addition, the first component is preferably polypropylene. When the second component is made of polyethylene and the composite fiber is a eccentric sheath type, it is preferable to use the core as the first component and the sheath as the second component. In the case where fibers are formed from the above two thermoplastic resins, the polypropylene of the first component may be a polymer synthesized by a usual Ziegler-Natta catalyst, or may be a single represented by a metallocene. The polymer synthesized by the active catalyst. Further, it may be ethylene random copolymerized polypropylene. These may be used alone or in combination of two or more. In particular, in terms of texture, strength, and dimensional stability, it is preferred to use homopolypropylene as a main component. Further, in terms of the spinnability at the time of fiber production and the strength of the fiber obtained, the lower limit of MFR (melt mass flow rate) of polypropylene is preferably 20 g/10 min or more. More preferably, it is more than 30 g/10 min, further preferably more than 40 g/10 min, and most preferably more than 53 g/10 min. The upper limit of the MFR is preferably 85 g/10 min or less, more preferably 70 g/10 min or less, and further preferably 60 g/10 min or less. MFR is based on JIS-K7210 "Test Method for Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate of Plastic-Thermoplastic Plastics". Test Temperature 230 ° C, Test Load 2.16 The measurement was carried out in kg. In the case where the fibers are formed of the above two thermoplastic resins, the polyethylene of the second component may be a polymer synthesized by a usual Ziegler-Natta catalyst, or may be a single represented by a metallocene. The polymer synthesized by the active catalyst. The polyethylene is preferably a high density polyethylene, a linear low density polyethylene, and has a density of preferably 0.92 to 0.97 g/cm. ³ More preferably 0.925 to 0.96 g/cm ³ . Further, from the viewpoint of spinnability in the production of fibers, the lower limit of MI (Melt Index) of polyethylene is preferably 10 g/10 min or more, more preferably more than 15 g/10 min. The upper limit of MI is preferably 100 g/10 min or less, more preferably 60 g/10 min or less, and further preferably 40 g/10 min or less. The MI system was measured in accordance with JIS-K7210 "Test method for melt-mass flow rate (MFR) and melt capacity flow rate (MVR) of plastic-thermoplastic plastics", test temperature: 190 ° C, and test load: 2.16 kg. Further, in the case of using a polyester resin, the lower limit of the solution viscosity ηsp/c is preferably 0.2 or more, more preferably 0.6 or more. The upper limit of the solution viscosity ηsp/c is preferably 0.9 or less, more preferably 0.8 or less. From the viewpoint of strength and productivity, the fibers constituting the nonwoven fabric of the present embodiment are preferably in the form of a long fiber obtained by a spunbonding method. In the case of forming a composite long fiber which is a combination of two or more kinds of thermoplastic resins, for example, two or more different extruders respectively melt and extrude different thermoplastic resins from a plurality of spinning holes. The wire nozzle is ejected as a thread in a state in which two or more kinds of thermoplastic resins are compounded. Then, the blown wire is cooled by the cold air controlled to 5 ° C to 20 ° C, and pulled by the pulling device. The wire extending from the traction device is stacked on the conveyor and conveyed in the form of a fabric. It is also possible to laminate the fabrics in the conveyance to form a multi-layered non-woven fabric. In the case of a multi-layered non-woven fabric, the layers may be formed by different fiber diameters, and non-woven fabrics of special-shaped fibers such as irregular-shaped cross-section fibers, crimped fibers, and hollow fibers may be laminated. The joining of the non-woven nets may be carried out by a method of joining by a binder, a method of joining by a low-melting-point fiber or a composite fiber, a method of dispersing a hot-melt adhesive in the formation of a fabric, and performing fusion bonding, using acupuncture, The method of entanglement of a fiber, such as a water flow, is not specifically limited. From the viewpoint of high productivity, bonding can also be performed by partial thermocompression bonding. For example, the woven fabric can be joined by passing between heated embossing/flat rolls which can impart a joint of a needle dot shape, an elliptical shape, a rhombic shape, a rectangular shape and the like. The thermocompression bonding area ratio in the partial thermocompression bonding is preferably 5 to 40% from the viewpoint of maintaining strength and flexibility, and maintaining the volume of the non-woven fabric so that the uneven structure of the surface does not collapse between the rolls. More preferably 5 to 25%. Moreover, in view of the fact that it is easy to maintain the characteristics of the surface structure of the non-woven fabric or the thickness of the non-woven fabric, in particular, in the case of a composite long fiber in which two or more thermoplastic resins are combined, it is possible to melt as long as it is heated to the intersection of the fibers. The method of performing the temperature higher than the temperature is not particularly limited, and as a method of heating, a hot air circulation type, a hot air penetration type, an infrared heater type, a method of spraying hot air onto both sides of the nonwoven fabric, and introduction to heating can be used. Various heating methods such as methods in gas. From the viewpoint of obtaining more fibers at the intersections of the fibers and the point at which the breaking strength of the non-woven fabric becomes high, it is preferred to use hot air heating, and more preferably a hot air through type. The hot air temperature of the hot air through type is preferably adjusted to a temperature suitable for the thermoplastic resin having a lower melting point and contributing to bonding in the combined thermoplastic resin. For example, in the case where the resin having a low melting point of two or more kinds of thermoplastic resins is polyethylene, it is preferred that the hot air temperature is that the polyethylene is melted and then carried out at 120 to 155 ° C, preferably 135 to 155 ° C, more preferably 140. °C ~ 150 °C. If the temperature is higher than 120 ° C, the fibers can be followed by the intersection of the fibers, and the strength as a non-woven fabric can be exhibited. Further, when the temperature is 155 ° C or higher, the degree of melting of the fiber becomes extremely high, and the texture becomes hard. The wind speed of the hot air is preferably from 0.5 to 3.0 m/s, more preferably from 0.7 to 2.5 m/s, still more preferably less than 2.0 m/s. If the wind speed is slow, the hot air cannot penetrate the thickness direction of the non-woven fabric, resulting in a lower strength. Moreover, when the wind speed is high, the hot air penetrates, but the fibers are simultaneously collapsed to become a non-woven fabric having a small volume. As long as the surface structure of the nonwoven fabric is not adversely affected, the nonwoven web before the heat bonding by the hot air may be subjected to heat treatment. From the standpoint of productivity, the heat is then preferably a pair of rolls by a combination of a metal embossing roll and a metal flat roll. The embossed area ratio is preferably from 5 to 30%, more preferably from 5 to 20%, still more preferably from 6 to 15%, from the viewpoint of the strength of the nonwoven fabric which is maintained or finally obtained in the form of the nonwoven web. Further, the deeper the embossing depth, the more the thickness of the nonwoven fabric can be maintained, preferably 0.5 to 2.0 mm, and more preferably 0.7 to 1.5 mm. The embossed shape is not particularly limited, but is preferably a circular shape, an elliptical shape, a rhombic shape, or a rectangular shape. The average fiber diameter of the non-woven fabric fiber is preferably 8.0 μm or more and 38.0 μm or less, more preferably 9.0 μm or more and 33.5 μm or less, and still more preferably 11.0 μm or more and 26.5 μm or less. From the viewpoint of the spinning stability, the average fiber diameter is preferably 8.0 μm or more, and more preferably 38.0 μm or less from the viewpoint of the texture of the non-woven fabric of the sanitary material. The basis weight of the non-woven fabric is preferably 8 g/m ² Above and 80 g/m ² Below, more preferably 10 g/m ² Above and 40 g/m ² Hereinafter, it is further preferably 10 g/m ² Above and 30 g/m ² the following. If the weight per unit area is 8 g/m ² Above, the strength is satisfied as a non-woven fabric for sanitary materials, if it is 80 g/m ² In the following, the texture of the non-woven fabric for sanitary materials is satisfied, and the appearance is not heavy. The height of the non-woven fabric without load is preferably 140 μm or more, more preferably 140 μm or more and 3000 μm or less, and further preferably 140 μm or more and 2000 μm or less. From the viewpoint of the texture of the non-woven fabric and the rewet performance of the water permeable property, the height at the time of no load is preferably 140 μm or more, and if it exceeds 3000 μm, the appearance is thick and the rigidity is not suitable for use. Sanitary materials. The alignment index obtained by X-ray CT of the nonwoven fabric is 0.43 or less, preferably 0.425 or less. When the alignment index obtained by X-ray CT is within this range, the number of fibers occupying the thickness direction of the nonwoven fabric is increased, and the volume is not collapsed even under load, and the nonwoven fabric having bulkiness is obtained, and the cushioning property is excellent and the bleed index is obtained. Lower hydrophilic fluffy non-woven fabric. The lower the lower limit, the better, but the alignment index is preferably 0.30 or more, more preferably 0.33 or more. The compression work amount WC of the nonwoven fabric of the present embodiment is preferably 0.20 gf·cm/cm. ² Above and 1.00 gf・cm/cm ² Hereinafter, it is more preferably 0.20 gf·cm/cm ² Above and 0.80 gf・cm·cm ² Hereinafter, in the case where the compression work amount WC in this range is maintained, the cushioning property as a non-woven fabric for sanitary materials and the excellent back-infiltration index can be obtained. The hydrophilic fluffy nonwoven fabric of the present embodiment contains or is coated with a water permeable agent. As the water-permeable agent to be used, in view of safety to the human body, safety in the step, and the like, a nonionic active agent to which an ethylene oxide is added, such as a higher alcohol, a higher fatty acid or an alkylphenol, or an alkyl group, may be mentioned. An anionic active agent such as a phosphate or an alkyl sulfate, or a surfactant composed of a mixture or the like alone or in combination. As the water permeable agent, for example, a polyether compound, a polyvinyl ether-modified polyfluorene oxide, a polyether modified polysiloxane, a polyester compound, a polyamine compound, a polyglycerin compound, or the like can be preferably used. As a method of containing or coating the water permeable agent, a conventional method such as kneading or coating into a fiber (gravure coater, contact coater), a spray method, or the like may be employed, and corona discharge treatment may be used as needed. Pre-treatment such as normal piezoelectric discharge treatment. As a drying method after coating, a known method using convection heat transfer, conduction heat transfer, radiation heat transfer or the like can be employed, and drying by hot air or infrared rays, drying by thermal contact, or the like can be used. The amount of the water-permeable agent to be applied varies depending on the intended use. For example, it is preferably used as a sanitary material, and is usually 0.10 wt% or more and 1.50 wt% or less, more preferably 0.15 wt% or more and 1.20 wt% or less with respect to the nonwoven fabric. . If it is less than 0.10 wt%, it is difficult to obtain satisfactory water permeability. On the other hand, if it exceeds 1.50 wt%, it is likely to cause rash or eczema on the skin. The water permeable agent may also be diluted with a solvent such as water to be applied as an aqueous solution. Further, in order not to cause insufficient drying or the like in the drying step accompanying the increase in speed of the apparatus, the amount of the aqueous solution of the water-permeable agent is preferably small. The coating amount (wt%) of the nonwoven fabric is preferably 1.0 wt% or more and 65 wt% or less, more preferably 3.0 wt% or more and 60 wt% or less, further preferably 5.0, in any of the above coating methods. More than wt% and less than 50 wt%. If it is less than 1.0 wt%, uniform coating cannot be obtained. On the other hand, if it exceeds 65 wt%, the required drying ability becomes large, the equipment cost increases, and insufficient drying may occur. For example, in the application of the water permeable agent by the gravure coater, the pattern of the gravure roll may be a lattice type or a pyramid type, and it is preferable that the water permeable agent does not easily remain in the oblique shape of the bottom of the intaglio unit. The unit volume is preferably 5 cm ³ /m ² Above and 40 cm ³ /m ² Below, if less than 5 cm ³ /m ² , the coating amount is too small, so it is difficult to apply uniform coating if it exceeds 40 cm ³ /m ² However, since the coating amount is too large, there arises a problem that uneven adhesion of the water permeable agent due to insufficient drying or migration in the drying step. The depth of the intaglio unit is preferably 10 μm or more and 80 μm or less, and the interval is preferably in the range of 80 mesh or more and 250 mesh or less, and is preferably designed to be the cell volume. It is possible to cope with the increase in speed of the equipment, and it can be applied efficiently, even if it is a non-woven fabric having a thickness, it can be uniformly applied in the thickness direction, and even if the permeability of the water-permeable agent and the non-woven fabric is slightly poor, the coating can be performed uniformly. It is preferable to apply the water permeable agent by a spray method because it is applied and the thickness of the nonwoven fabric is easily maintained by the step of passing the nonwoven fabric between the pair of rolls. The spray method may be a commonly known method of spraying by air compression or directly compressing an aqueous solution of a water-permeable agent and spraying it, so that it can be uniformly applied to a non-woven fabric, and it is particularly preferable to rotate the rotor (rotor dampening). )the way. By implementing a strategy for preventing splashing of the aqueous solution of the water-permeable agent during coating, the coating can be performed even when the apparatus is operated at a high speed. The rotor wetting method is a method in which an aqueous solution of a water-permeable agent is supplied to a rotating rotor, and a water-permeable agent aqueous solution is sprayed by centrifugal force of rotation of the rotor. In the rotor wetting mode, it is possible to spray the liquid particles of the aqueous solution of the water-permeable agent which is flying out of the rotor only in the coating direction only on the non-woven side to be coated, and can be used for the CD of the nonwoven fabric (Cross Direction, horizontal direction). The direction is uniformly applied to define the opening portion, and the spray particle diameter is adjusted by the rotation speed of the rotor. In the case of the rotor wetting method described above, for example, if the diameter of the selected rotor is 40 mm or more and 100 mm or less, the non-woven fabric surface to be coated is set such that the aqueous solution of the water permeable agent can be uniformly attached to the CD direction of the non-woven fabric to be coated. The distance from the center of the rotor. It is preferred to set the overlap of one-half of the coating distribution range of the adjacent rotor spray. Further, it is preferable that the rotors are disposed at equal intervals in the CD direction in a range of 60 mm or more and 220 mm or less, and are set to two stages. The key to uniform coating is to penetrate the spray particles into the interior of the non-woven fabric to be coated, and the spray particle diameter is preferably 0.010 mm or more and 0.200 mm or less, and further preferably 0.030 mm or more and 0.070 mm or less. In order to form an optimum spray particle size, the surface tension of the aqueous solution of the water-permeable agent becomes important, and the spray particle size is calculated by the following formula. Spray particle size (μm) = {100000 × √ (surface tension (N / m))} / (rotor diameter (mm) × rotor speed (rpm)) Further, the temperature of the aqueous solution of the water permeable agent in the coating method is higher The temperature is preferably 5 ° C or more and 50 ° C or less, and more preferably 12 ° C or more and 40 ° C or less from the viewpoint of uniform dispersion and stability of the solution. The viscosity of the aqueous solution of the water-permeable agent is preferably 0.5 mPa·s or more and 50 mPa·s or less, and more preferably 0.8 mPa·s or more and 20 mPa·s or less from the viewpoint of being more uniformly applied. When the viscosity exceeds 50 mPa·s, the permeability of the water-permeable agent aqueous solution to the nonwoven fabric is poor, and it is difficult to apply uniform coating. The drying method after applying the aqueous solution of the water-permeable agent can be carried out by a usual drying method, and is not particularly limited, and a known method using convection heat transfer, conduction heat transfer, radiation heat transfer, or the like can be used, and a hot air circulation type or a hot air flow type can be used. Various drying methods such as an infrared heater type, a method of spraying hot air onto both sides of a non-woven fabric, and a method of introducing into a heated gas. As shown in Fig. 1, the surface structure of the nonwoven fabric of the present embodiment is characterized in that the maximum height in the unit block defined by the X direction Y direction is set when the measurement reference length on the surface of the nonwoven fabric is 100 μm. The ratio of the block having a height (thickness) of 30% or more in the non-woven fabric without load is 50% or more per 40,000 blocks corresponding to the surface area of the non-woven fabric of 20 mm × 20 mm. The measurement reference length and the maximum height on the surface of the nonwoven fabric are as follows. Using a digital microscope KH-8700 (manufactured by Hirox), the height information of the non-woven surface was measured at intervals of 20 μm in all directions in the MD (Machine Direction) direction of 20 mm in the non-woven fabric and 20 mm in the CD direction. The height information obtained in the MD direction of 20 mm × CD direction 20 mm of the non-woven fabric is divided every 100 μm, and the length divided at this time is used as the measurement reference length. Further, the difference between the maximum value and the minimum value in the unit block is taken as the maximum height of the surface of the nonwoven fabric. The ratio of the maximum height to the height (thickness) when the non-woven fabric has no load is calculated from the maximum height (μm) / height without load (μm) × 100. That is, the higher the ratio of the maximum height to the block in which the ratio of the height (thickness) of the non-woven fabric without load is 30% or more, the larger the unevenness of the unevenness in the fine block on the non-woven surface. In the present embodiment, the block having a ratio of the maximum height to the height (thickness) when the non-woven fabric has no load is 30% or more with respect to the 20 mm in the MD direction of the non-woven fabric × 20 mm in the CD direction to measure the reference length of 100 μm. The division of each of the 40,000 blocks is 50% or more. By the feature of the structure having such a non-woven surface, for example, regardless of the water-permeable agent imparted to the non-woven fabric, when a liquid such as urine adheres to the surface of the non-woven fabric, the contact angle thereof becomes low, and the liquid is quickly moved from the non-woven surface to the inside of the non-woven fabric. . In the present embodiment, the ratio of the maximum height to the block having a height (thickness) of 30% or more with respect to the non-woven fabric without load is 50% or more, preferably 52% or more. More preferably, it is 55% or more, and further preferably 60% or more. By the ratio being within this range, good water permeability can be exhibited. The higher the ratio, the better, but it is preferably 98% or less in terms of deterioration of the touch of the skin. The water-permeable 45-degree inclined flow length which is an index of the water permeability of the non-woven fabric of the present embodiment is 25 mm or less, preferably 22 mm or less, more preferably 20 mm or less, and most preferably 18 mm or less. If the turbulent flow length of 45 degrees is more than 25 mm, for example, in the case of a surface material for a disposable diaper or the like, the liquid flow on the surface is increased, and leakage of urine is likely to occur. The fourth durability permeation index which is an index of the water permeability of the non-woven fabric of the present embodiment is 85% or more. If the value of the fourth durability permeable index is less than 85%, for example, in the case of a surface material for a disposable diaper, for a plurality of urinations, the surface material is not permeable to water and loses its function as a surface material, which is likely to cause Leaking urine. Further, the bleed index which is an index of the water permeability of the nonwoven fabric of the present embodiment is preferably 0.8 g or less, more preferably 0.5 g or less. If the value of the osmosis index exceeds 0.8 g, for example, in the case of a surface material for a disposable diaper, the surface material has a very moist touch when it comes into contact with the skin, and the feeling of use is deteriorated. The lower the osmosis index, the better, but the value below 0.01 g is the lower limit of measurement, and the measurement deviation is large. [Examples] Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples, but the present invention is not limited to the following Examples. Further, the evaluation methods of the respective characteristics are as follows, and the obtained physical properties are shown in Table 1 below. Hereinafter, the traveling direction in the nonwoven fabric manufacturing is referred to as the MD direction, and the direction perpendicular to the direction is referred to as the CD direction. 1. Average fiber diameter (μm) A test piece of 1 cm square was selected in the CD direction of the non-woven fabric, and the diameter of the fiber was measured at 20 points using a microscope VHX-700F manufactured by KEYENCE, and the average value was calculated. 2. Non-woven fabric weight per unit area (g/m ² According to JIS-L1906, five test pieces in the MD direction of 20 cm × CD direction of 5 cm are selected in the CD direction of the non-woven fabric by the selected position, and the mass is measured, and the average value is converted into the weight per unit area. Weight per unit area (g/m ² ). 3. Height (thickness) of non-woven fabric without load (μm) Select 10 pieces of test piece with MD direction of 4 mm × CD direction of 10 mm, using SEM (Scanning Electron Microscope) (VE-8800) manufactured by KEYENCE ) Take a photo of the non-woven cross section. The image obtained was an image analysis software manufactured by KEYENCE, and the distance in the thickness direction was measured at five points for each image, and the average value was defined as the height (thickness) (μm) at the time of no load. 4. Maximum height of the non-woven surface (μm) The non-woven fabric is cut in a square shape of 20 mm × 20 mm in any direction. Then, using the 3D distribution function of a digital microscope KH-8700 (manufactured by Hirox), the height information of the surface of the non-woven fabric was measured at intervals of 20 μm in each direction of 20 mm in the direction of each side of the non-woven fabric. The height information obtained in each of 20 mm × 20 mm of each side of the non-woven square is divided every 100 μm, and the length of the division at this time is taken as the measurement reference length. Further, the difference between the maximum value and the minimum value in the block is taken as the maximum height of the surface of the nonwoven fabric. This measurement sequence is schematically shown in Fig. 1. The ratio of the maximum height of the non-woven surface to the height (thickness) (μm) when the non-woven fabric is not loaded is calculated by the height (thickness) (μm) × 100 at the maximum height (μm) / no load. Further, the number of blocks in which the ratio of the maximum height to the height (thickness) of the non-woven fabric without load is 30% or more is divided by the direction of each side of the square of the non-woven fabric by 20 mm × 20 mm, and the reference length is 100 μm. The ratio (%) is calculated by the number of 40,000 blocks. 5. Index (X-ray CT) A test piece of 5 mm × CD direction of 5 mm in the MD direction was arbitrarily cut and measured with a field of view of about 3 mm × 3 mm at the time of image analysis. The measurement apparatus was measured by a high-resolution 3DX-ray microscope nano3DX (manufactured by Rigaku Co., Ltd.), and was measured by CT measurement of low-energy high-intensity X-rays which obtained contrast even for light elements. The detailed conditions are shown below. X-ray target: Cu X-ray tube voltage: 40 kV X-ray tube current: 30 mA Lens: 1.08 μm/pix Combination: 2 Rotation angle: 180° Projection number: 1000 sheets Exposure time: 10 seconds / camera pixel: 3300 × 2500 Reconstruction: The Feldkamp method performs image analysis on the three-dimensional tomogram obtained by CT measurement, and obtains the orthogonal index 3x (x, y, z) alignment index Ix, Iy, Iz. The thickness direction of the sample to be evaluated is consistent with the z direction. Here, the alignment indexes Ix, Iy, and Iz are the sum of the areas of the fiber surfaces observed in the respective directions of x, y, and z (the sum of the projected projection areas of the fiber surfaces in the respective directions) are set to Ax, respectively. In the case of Ay, Az, Ix=Ax/(Ax+Ay+Az) Iy=Ay/(Ax+Ay+Az) Iz=Az/(Ax+Ay+Az). Ax, Ay, and Az are determined from chromatograms. In this indicator, alignment is performed in a direction where the value is small. Moreover, all of the isotropic structures are 1/3. 6. Compression work amount (WC) A test piece of 5 cm square at 5 points was selected in the CD direction, and was measured using a compression test device (KES-G5) manufactured by Kato Tech. Set the test piece on a metal sample stage with a pressurized area of 2 cm ² Compression is carried out between the steel plates of a circular plane. The compression speed is 0.067 mm/s and the maximum compression load is set to 3.4 kPa (35 gf/ cm) ² ). The recovery process is also measured at the same speed and the average of the compression work is calculated. 7. The number of crimps (units/2.54 cm (吋)) The test piece of 5 cm square was selected in the CD direction of the non-woven fabric, and the load of the fiber was not applied to the fiber by the microscope VH-Z450 manufactured by KEYENCE. Five fibers were selected, and the number of crimps per one length was measured, and the number of crimps (number / 吋) was calculated from the average value. 8. Permeability 45 degree inclined flow length value (mm) 10 sheets of toilet paper (HARD SINGLE 1R55m manufactured by Itoman Co., Ltd.) were superposed on the plate inclined at 45 degrees as an absorber, and a test cloth (20 cm square) was placed thereon. ), 0.1 cc of physiological saline was added dropwise from a height of 10 mm above the cloth. The distance from which the physiological saline flows from the dropping position to the end of absorption is read. The measurement was carried out at any 20 points in the test cloth, and the average value thereof was taken as a water-permeable 45-degree inclined flow length value (mm). 9. Durable water permeability index (%) 10 sheets of toilet paper (HARD SINGLE 1R55m manufactured by Itoman Co., Ltd.) were superposed as an absorbent body, and a test cloth (20 cm × 30 cm) was placed thereon. Further, a stainless steel plate having a hole of 1.5 cm in diameter was placed at an interval of 10 intervals, and 0.3 cc of physiological saline was dropped from a height of 10 mm above the cloth of each hole. After 3 minutes, the same again. Add dropwise. After the third dropwise addition, the number of holes (A) absorbed within 10 seconds was counted. This test was carried out on the same sample 40 and {((A)/(hole 10 × sample 40) × 100)} was taken as the third water permeability endurance index (%). In addition, after the fourth addition, the number of holes (B) absorbed within 10 seconds is counted in the same manner as in the third time, and {((B)/(hole 10 × sample 40) ×100)} as the fourth water permeability endurance index (%). 10. The osmosis index (g) The test cloth was placed on three sheets of specific filter paper (GRADE: 989, manufactured by Ahlstrоm Co., Ltd.) in order to set the characteristics of the absorber in advance as an absorber. Furthermore, a plate of 10 cm square was placed above it and a plate with a diameter of 25 mm (about 800 g) was opened in the center, and physiological saline (3.5 times the weight of the absorbent body) was dropped from the height of 25 mm above the central hole and It absorbs. Next, remove the plate above the test cloth and gently place a 3.5 kg weight (10 cm square) and take 3 minutes to make the distribution of the liquid in the absorber constant. Then, temporarily remove the 3.5 kg weight and quickly place two pre-weighed measurement filter papers (ERTWWS SHEETS manufactured by HOLLINGSWORTH & VOSE.CONPANY, 12.5 cm square) on top of the test cloth, and gently place 3.6 kg again. Weight. After 2 minutes, the weight increase of the measurement filter paper was weighed. The value (g) of the increase amount was taken as the osmosis index. 11. Coating amount (wt%) of the water-permeable agent aqueous solution The value calculated by the following formula is used as the coating amount (wt%) of the water-permeable agent aqueous solution by the amount of the water-permeable agent aqueous solution consumed for one hour. Coating amount (wt%) = water-permeable agent aqueous solution consumption (g) / {non-woven basis weight (g/m) ² × width (m) × processing speed (m / min) × 60 (min) } × 100 12. Water-permeable agent pure adhesion amount (wt%) for 24 hours humidity control at 25 ° C × 40% RH temperature and humidity The weight (W1) of the non-woven fabric sample to which the water permeable agent is attached and the weight (W2) of the water permeable agent obtained by Soxhlet extraction from the nonwoven fabric sample are measured, and the pure adhesion amount of the water permeable agent is determined by the following formula. (wt%). C (wt%)=[W2/W1]×100 The sample of the non-woven fabric sample is cut at a distance of 30 cm from 5 points in the MD direction at 5 cm intervals in the CD direction at intervals of 5 in the width of the non-woven fabric. The 10 cm range and the non-woven sample were cut to a length of about 2 g, and a total of 10 test cloths were selected. The above measurement was carried out and the average value of these was taken as the pure adhesion amount (wt%) of the water permeable agent. 13. The non-woven fabric was selected by dispersion at 50 cm × 50 cm, and classified by the following evaluation criteria based on the appearance of the non-woven fabric. The viewpoint of the dispersion evaluation is whether or not the streaks such as stripes are irregular, or whether the single yarn is uniformly spread (whether or not it is not blocky). The higher the level, the better the dispersion. 5: Very good 4: Good 3: Normal (level that can be used as a product) 2: Poor 1: Very poor [Example 1] The MFR was 55 g/10 min (according to JIS-K7210, at a temperature of 230 ° C, A polypropylene (PP) resin having a weight of 2.16 kg as a first component, and a high-density polyethylene having a MI of 26 g/10 min (measured according to JIS-K7210 at a temperature of 190 ° C and a load of 2.16 kg) (HDPE) resin as the second component, the discharge amount of the first component is 0.4 g/min·hоle by the spunbonding method at a spinning temperature of 220 ° C, and the discharge amount of the second component is 0.4 g/min·hоle A fiber having a total discharge amount of 0.8 g/min·hоle and a ratio of the first component to the second component of 1/1 was extruded at a spinning speed of 3200 m/min toward a moving capturing surface using a high-speed airflow pulling device by air jet. The filament group was prepared into an eccentric sheath-core composite long fiber fabric having an average fiber diameter of 17.9 μm. Then, for the obtained fabric, the fibers were adhered to each other by a hot air having a hot air temperature of 142 ° C and a hot air wind speed of 0.7 m / s to obtain a basis weight of 18 g / m. ² The composite long-fiber non-woven fabric with a crimping number of 15/吋. Then, the 3 wt% aqueous solution of the water permeable agent containing a mixture of hexaglycerol monostearate, polyether modified polyxanthine and polyoxyalkylene ricinoleate was adjusted to a liquid temperature of 20 ° C and a liquid viscosity of 3.2 mPa. s was applied to the above-mentioned nonwoven fabric by a rotor wetting method as a water-permeable agent aqueous solution for the obtained nonwoven fabric so that the coating amount was 10 wt%. The rotor used was 80 mm in diameter, and each rotor was arranged at a distance of 115 mm in the CD direction so that the distance between the center of the rotor and the applied non-woven fabric became 180 mm. Further, the rotor rotation speed was adjusted so that the sprayed aqueous solution of the water-permeable agent aqueous solution had a spray particle size of 35 μm. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 85%, and the water permeability of the non-woven fabric is permeable. The 45-degree inclined flow length is 16 mm, the fourth durable water permeability index is 99%, and the rewet index is 0.12 g. The results are shown in Table 1 below. [Example 2] In the same manner as in Example 1, an average fiber diameter of 17.9 μm and a basis weight of 10 g/m were obtained. ² The eccentric sheath-core composite long-fiber non-woven fabric with a crimping number of 15/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 87%, and the non-woven fabric is permeable. The 45-degree inclined flow length is 14 mm, the fourth durable permeable index is 99%, and the rewet index is 0.50 g. The results are shown in Table 1 below. [Example 3] The discharge amount of the first component was 0.54 g/min·hоle, the discharge amount of the second component was 0.26 g/min·hоle, and the total discharge amount was 0.80 g/min·hоle, the first component and the second component. An eccentric sheath-core composite long fiber fabric having an average fiber diameter of 17.9 μm was prepared in the same manner as in Example 1 except that the ratio of the components was about 2/1. For the obtained eccentric sheath-core composite long-fiber fabric, the fibers were adhered to each other by hot air having a hot air temperature of 145 ° C and a hot air velocity of 1.0 m/s to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a number of crimps of 10/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 74%, and the water permeability of the non-woven fabric is permeable. The 45-degree inclined flow length is 16 mm, the fourth durable water permeability index is 99%, and the rewet index is 0.12 g. The results are shown in Table 1 below. [Example 4] An average fiber diameter of 17.9 μm and a basis weight of 18 g/m were obtained in the same manner as in Example 3. ² The composite long-fiber non-woven fabric with a number of crimps of 10/吋. The 1 wt% aqueous solution of the water permeable agent was adjusted to a liquid temperature of 20 ° C, a liquid concentration of 2.3 mPa·s, and a gravure pattern of 120 mesh and a cell volume of 22 cm was used for gravure coating. ³ /m ² The gravure roll was applied to the obtained composite long-fiber nonwoven fabric in such a manner that the coating amount was 30% by weight, and then dried and wound up by a tumble dryer at 120 °C. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45-degree inclined flow length is 17 mm, the fourth durable permeable index is 97%, and the rewet index is 0.22 g. The results are shown in Table 1 below. [Example 5] The first component was set to the same polypropylene resin as in Example 1, and the second component was set to MI of 16.8 g/10 min (according to JIS-K7210, at a temperature of 190 ° C and a load of 2.16 kg). The linear low-density polyethylene (LLDPE) resin measured by the spinning method has a discharge amount of 0.54 g/min·hоle at a spinning temperature of 220 ° C, and a discharge amount of the second component is 0.26 g/min·hоle and a total discharge amount of 0.8 g/min·hоle, a ratio of the first component to the second component of about 2/1, which is extruded toward the moving capturing surface using a high-speed airflow pulling device by air jet. The filament group was prepared into an eccentric sheath-core long fiber fabric having an average fiber diameter of 20.5 μm. For the obtained eccentric sheath-core long-fiber fabric, the fibers were adhered to each other by hot air having a hot air temperature of 150 ° C and a hot air wind speed of 0.3 m/s to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 40/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45-degree inclined flow length is 15 mm, the fourth durable permeable index is 99%, and the rewet index is 0.35 g. The results are shown in Table 1 below. [Example 6] An average fiber diameter of 20.5 μm and a basis weight of 18 g/m were obtained in the same manner as in Example 5. ² The eccentric sheath-core composite long-fiber non-woven fabric with a crimping number of 40/吋. Then, the aqueous solution of the water-permeable agent similar to that of Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions except that the concentration of the aqueous solution of the water-permeable agent was 5 wt%. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45-degree inclined flow length is 13 mm, the fourth durable permeable index is 99%, and the rewet index is 0.47 g. The results are shown in Table 1 below. [Example 7] An eccentric sheath-core composite long fiber fabric having an average fiber diameter of 17.9 μm was prepared in the same manner as in Example 1. Then, the obtained eccentric sheath-core composite long-fiber non-woven fabric was passed through a flat roller and an embossing roller at 100 ° C (pattern specification: circular, misaligned, 4.4 mm in diameter, lateral spacing 4.4 mm, longitudinal spacing 4.4 mm) Between the crimping area ratios of 7.9%, the fibers were temporarily brought into contact with each other, and then the fibers were adhered to each other by a hot air having a hot air temperature of 142 ° C and a hot air velocity of 0.7 m/s to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 17/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45 degree sloping flow length is 18 mm, the fourth durable permeable index is 95%, and the rewet index is 0.18 g. The results are shown in Table 1 below. [Example 8] An average fiber diameter of 17.9 μm and a basis weight of 8 g/m were obtained in the same manner as in Example 7. ² The eccentric sheath-core composite long-fiber non-woven fabric with a crimping number of 17/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 74%, and the water permeability of the non-woven fabric is permeable. The 45 degree sloping flow length is 16 mm, the fourth durable permeable index is 97%, and the rewet index is 0.42 g. The results are shown in Table 1 below. [Example 9] Using the same components as in Example 1, the discharge amount of the first component was 0.40 g/min·hоle by the spunbonding method at a spinning temperature of 220 ° C, and the discharge amount of the second component was 0.40. g/min·hоle and the total discharge amount was 0.8 g/min·hоle, and the ratio of the first component to the second component was 1/1. A side-by-side composite long fiber fabric having an average fiber diameter of 17.9 μm was prepared by extruding the filament group at a spinning speed of 3200 m/min toward the moving capturing surface using a high-speed air stream pulling device using air jet. Then, with respect to the obtained side-by-side type composite long fiber fabric, the fibers were adhered to each other in the same manner as in Example 7 to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 23/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) of the non-woven fabric without load is 30% or more is 76%, and the nonwoven fabric is not woven. The permeable flow length of 45 degrees is 15 mm, the fourth durability permeable index is 99%, and the rewet index is 0.15 g. The results are shown in Table 1 below. [Example 10] The first component was made into polyethylene terephthalate (PET) having a solution viscosity of 0.75 ηsp/c, and the second component was made into high-density polyethylene (HDPE) similar to that of Example 1. The amount of the first component to be extruded at a spinning temperature of 295 ° C by the spunbonding method was 0.54 g/min·hоle, the discharge amount of the second component was 0.26 g/min·hоle, and the total discharge amount was 0.80 g/min.・hоle, a fiber having a ratio of the first component to the second component of about 2/1, and extruding the filament group toward the moving capturing surface by using a high-speed airflow pulling device by air jet to prepare an eccentric sheath having an average fiber diameter of 18.7 μm. Core composite long fiber fabric. With respect to the obtained eccentric sheath-core composite long fiber fabric, the fibers were adhered to each other in the same manner as in Example 1 to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 20/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 87%, and the non-woven fabric is permeable. The 45-degree inclined flow length is 15 mm, the fourth durable water permeability index is 99%, and the rewet index is 0.15 g. The results are shown in Table 1 below. [Example 11] Using the same components as in Example 1, the discharge amount of the first component was 0.24 g/min·hоle, the discharge amount of the second component was 0.56 g/min·hоle, and the total discharge amount was 0.8 g/min. In the same manner as in Example 1, an eccentric sheath-core composite long fiber fabric having an average fiber diameter of 17.9 μm was prepared in the same manner as in Example 1 except that the ratio of the first component to the second component was 3/7. With respect to the obtained eccentric sheath-core composite long fiber fabric, the fibers were adhered to each other in the same manner as in Example 1 to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 17/吋. Then, the same aqueous solution of the water-permeable agent as in Example 4 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) of the non-woven fabric without load is 30% or more is 70%, and the nonwoven fabric is not woven. The permeable flow length of 45 degrees is 18 mm, the fourth durability permeable index is 95%, and the rewet index is 0.18 g. The results are shown in Table 1 below. [Example 12] Using the same components as in Example 1, the discharge amount of the first component was 0.16 g/min·hоle, the discharge amount of the second component was 0.64 g/min·hоle, and the total discharge amount was 0.8 g/min. In the same manner as in Example 1, except that the ratio of the first component to the second component was 1:4, an eccentric sheath-core composite long fiber fabric having an average fiber diameter of 18.7 μm was prepared. With respect to the obtained eccentric sheath-core composite long fiber fabric, the fibers were adhered to each other in the same manner as in Example 1 to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 5/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) of the non-woven fabric without load is 30% or more is 52%, and the nonwoven fabric is not woven. The permeable flow length of 45 degrees is 22 mm, the fourth durability permeable index is 85%, and the osmosis index is 0.45 g. The results are shown in Table 1 below. [Example 13] Using the same components as in Example 1, the discharge amount of the first component was 0.40 g/min·hоle by the spunbonding method at a spinning temperature of 220 ° C, and the discharge amount of the second component was 0.40. g/min·hоle and the total discharge amount is 0.8 g/min·hоle, and the ratio of the first component to the second component is 1:1. The extruded filaments were stretched in the traction region by the suction force of the moving capturing surface, and then deposited on the moving capturing surface by a diffuser to prepare a side-by-side composite long fiber fabric having an average fiber diameter of 20.5 μm. Then, with respect to the obtained side-by-side type composite long fiber fabric, the fibers were adhered to each other in the same manner as in Example 1 to obtain a basis weight of 18 g/m. ² The composite long-fiber non-woven fabric with a crimping number of 25/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) of the non-woven fabric without load is 30% or more is 90%, and the nonwoven fabric is not woven. The permeable flow length of 45 degrees is 14 mm, the fourth durability permeable index is 99%, and the rewet index is 0.17 g. The results are shown in Table 1 below. [Example 14] An average fiber diameter of 20.5 μm and a basis weight of 30 g/m were obtained in the same manner as in Example 13. ² The eccentric sheath-core composite long-fiber non-woven fabric with a crimping number of 25/吋. Then, the same aqueous solution of the water-permeable agent as in Example 1 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 89%, and the water permeability of the non-woven fabric is permeable. The 45-degree inclined flow length is 14 mm, the fourth durable permeable index is 99%, and the rewet index is 0.12 g. The results are shown in Table 1 below. [Example 15] Using a spinning head equipped with a figure-shaped shaped nozzle, a polypropylene (PP) having an MFR of 38 g/10 min was extruded at a spinning temperature of 240 ° C and a discharge amount of 0.80 g / min·hоle. The filament group was extruded toward the moving capturing surface by a high-speed air stream pulling device of air jet to obtain a long fiber fabric having an average fiber diameter of 18.7 μm. Then, the obtained long fiber fabric was passed through a flat roll and an embossing roll set to a temperature of 135 ° C and a pressure of 60 kg / cm (pattern specification: circular shape with a diameter of 0.425 mm, misalignment arrangement, lateral spacing of 2.1 mm, longitudinal spacing) Between 1.1 mm and a crimp area ratio of 6.3%), the fibers are partially joined to each other to obtain a basis weight of 25 g/m. ² , the number of crimped 28 / 吋 long fiber non-woven fabric. Then, the same aqueous solution of the water-permeable agent as in Example 4 was applied to the obtained long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45-degree inclined flow length is 23 mm, the fourth durable permeable index is 89%, and the rewet index is 0.12 g. The results are shown in Table 1 below. [Table 1] A polypropylene (PP) resin having a MFR of 55 g/10 min (measured according to JIS-K7210 at a temperature of 230 ° C and a load of 2.16 kg) at a spinning temperature of 220 ° C by a spunbonding method at a spinning temperature of 220 ° C, The filament group was extruded toward the moving trapping surface using a high-speed air stream pulling device using air jet to prepare a long fiber fabric having an average fiber diameter of 17.9 μm. Then, the obtained fabric was passed between a flat roller of 141 ° C and an embossing roller (pattern specification: circular diameter of 0.425 mm, misalignment, lateral spacing of 2.1 mm, longitudinal spacing of 1.1 mm, and crimping area ratio of 6.3%). The fibers are then joined to each other to obtain a weight per unit area of 18 g/m. ² The long fibers of the uncontracted fibers are not woven. Then, the same aqueous solution of the water-permeable agent as in Example 4 was applied to the obtained long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45 degree sloping flow length is 28 mm, the fourth durable permeable index is 74%, and the rewet index is 0.56 g. The results are shown in Table 2 below. [Comparative Example 2] The long-fiber non-woven fabric obtained in Comparative Example 1 was passed through a continuous honeycomb shape pattern of 0.9 mm in width and 0.1 mm in line width (cavity concave pattern) (pressing area ratio: 12.5%, pattern spacing: longitudinal direction 2.8 mm) Between the embossing roller (80 ° C) with a lateral direction of 3.2 mm and a depth of 0.7 mm) and a rubber roller with a surface hardness of 60 degrees (JIS-A hardness) at 2 kg/cm ² The pressure presses the pattern. A long fiber non-woven fabric having a high density region and a central convex shape pressed around the shell of the turtle is obtained. Then, the same aqueous solution of the water-permeable agent as in Example 4 was applied to the obtained long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45 degree sloping flow length is 27 mm, the fourth durable permeable index is 80%, and the rewet index is 0.68 g. The results are shown in Table 2 below. [Comparative Example 3] Using the same components as in Example 1, the discharge amount of the first component was 0.72 g/min·hоle by the spunbonding method at a spinning temperature of 220 ° C, and the discharge amount of the second component was 0.08. G/min·hоle and a total discharge amount of 0.8 g/min·hоle, a ratio of the first component to the second component of 9/1, and the high-speed airflow pulling device using air jet is used to extrude the length toward the moving capturing surface. For the silk group, an eccentric sheath-core composite long fiber fabric having an average fiber diameter of 16.7 μm was prepared. Then, for the obtained eccentric sheath-core composite long-fiber fabric, the fibers were adhered to each other by hot air having a hot air temperature of 142 ° C and a hot air wind speed of 0.7 m/s to obtain a basis weight of 18 g/m. ² , a composite long fiber non-woven fabric with a number of crimps of 0/吋. Then, the same aqueous solution of the water-permeable agent as in Example 4 was applied to the obtained composite long-fiber nonwoven fabric under the same coating conditions. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more is 48%, and the water permeability of the non-woven fabric is permeable. The 45 degree sloping flow length is 28 mm, the fourth durable permeable index is 64%, and the rewet index is 0.52 g. The results are shown in Table 2 below. [Comparative Example 4] Using the same components as in Example 1, the discharge amount of the first component was 0.54 g/min·hоle at a spinning temperature of 220 ° C by the spunbonding method, and the discharge amount of the second component was 0.26. G/min·hоle and the total discharge amount is 0.8 g/min·hоle, and the ratio of the first component to the second component is 2/1, and the high-speed airflow pulling device by air jet is used to extrude the length toward the moving capturing surface. For the silk group, a sheath-core composite long fiber fabric having an average fiber diameter of 16.7 μm was prepared. Then, with respect to the obtained fabric, the fibers were adhered to each other in the same manner and under the same conditions as in Comparative Example 3, and then a water-permeable aqueous solution was applied to obtain a basis weight of 18 g/m. ² , a composite long fiber non-woven fabric with a number of crimps of 0/吋. The ratio of the maximum height in the block when the measurement reference length of the surface of the obtained non-woven fabric is 100 μm to the height (thickness) when the non-woven fabric has no load is 30% or more, and the ratio of the non-woven fabric is permeable. The 45 degree slope flow length is 26 mm, the fourth durability permeable index is 73%, and the rewet index is 0.60 g. The results are shown in Table 2 below. [Table 2] [Industrial Applicability] The hydrophilic fluffy nonwoven fabric of the present invention has excellent water permeability, and thus can be preferably used for the production of sanitary materials. Regarding the sanitary material, it can be preferably used for the top sheet of the surface of disposable diapers, menstrual sanitary napkins or incontinence pads. Moreover, the hydrophilic fluffy nonwoven fabric of the present invention is not limited to the above applications, and can also be used, for example, for a mask, a hearth, a tape backing cloth, a patch base cloth, a wound base cloth, a packaging material, a wiping product, a medical robes, a bandage. , clothing, skin care sheets, etc.

Fig. 1 is a view for explaining measurement of the maximum height (μm) in a unit block on the surface of the nonwoven fabric.

Claims (8)

A hydrophilic fluffy non-woven fabric characterized in that it comprises thermoplastic fibers and has the following non-woven surface structure, that is, a unit area defined by the X-direction Y direction when the measurement reference length of the non-woven surface is set to 100 μm. The ratio of the maximum height in the block to the height of the non-woven fabric in the Z direction without load (thickness) of 30% or more is 50% of the number of blocks per 40,000 corresponding to the surface area of the nonwoven fabric of 20 mm × 20 mm. The above, and the water-permeable 45-degree inclined flow length value of the non-woven fabric is 25 mm or less, and the fourth durable water permeability index is 85% or more. The hydrophilic fluffy nonwoven fabric of claim 1, wherein the hydrophilic fluffy nonwoven fabric has an orientation index in the thickness direction obtained by X-ray CT of 0.43 or less. The hydrophilic bulky nonwoven fabric of claim 1 or 2, wherein the hydrophilic bulky nonwoven fabric has a compressive work amount of 0.20 gf·cm/cm ² or more and 1.00 gf·cm/cm ² or less. The hydrophilic fluffy nonwoven fabric according to any one of claims 1 to 3, wherein the number of the fibers constituting the hydrophilic fluffy nonwoven fabric is 5 to 45 / 2.54 cm (吋). The hydrophilic fluffy nonwoven fabric according to any one of claims 1 to 4, wherein the thermoplastic fiber is a side-by-side or eccentric sheath-core type composite fiber. The hydrophilic fluffy nonwoven fabric according to any one of claims 1 to 5, wherein the thermoplastic fiber is a polyolefin-based fiber. The hydrophilic fluffy nonwoven fabric according to any one of claims 1 to 6, wherein the thermoplastic fiber is a long fiber. A sanitary material obtained by using the hydrophilic fluffy nonwoven fabric according to any one of claims 1 to 7.