Perforated non-woven fabric and method for producing same

Abstract

Provided is an open-cell non-woven fabric having excellent softness and softness even when a load is applied thereto. The present invention relates to an open-cell nonwoven fabric, and more particularly, to an open-cell nonwoven fabric having a plurality of open cells, the open-cell nonwoven fabric having an area ratio of the open cells (open-cell area ratio) of 3% or more and a rate of change in the open-cell area ratio of 30% or less.

Description

Technical Field

[0001] The present invention relates to a nonwoven fabric having openings and a method for manufacturing the same. Background Art

[0002] There is a growing demand for improved comfort in nonwoven fabrics used in hygiene materials such as disposable diapers and sanitary napkins. In particular, as the surface material of hygiene materials, it is required to be soft and have a good touch, and it is necessary to have the performance of quickly transporting various liquids or solid substances with different viscosities such as urine, soft feces, and menstrual blood to the absorbent body (liquid permeability). As such a nonwoven fabric, for example, a nonwoven fabric having openings (hereinafter referred to as an open-cell nonwoven fabric) can be cited.

[0003] As an open-cell nonwoven fabric, Patent Document 1 discloses the following method: while holding a nonwoven fabric between a needle roll and a perforated roll that receives the needle roll, heated needles of the needle roll are inserted into the nonwoven fabric to form openings. In addition, Patent Document 2 discloses the following method: as a surface sheet used in a diaper, a high-speed water jet treatment is performed on a net to interweave its fibers and distribute the fibers to form openings. However, the open-cell nonwoven fabrics obtained by these conventional methods have the following problems: when a load is applied, such as when the open-cell nonwoven fabric is wound around a roll or when wearing a diaper, the liquid permeability (especially the permeability of a highly viscous liquid such as soft feces) decreases. In addition, by increasing the area ratio or size of the openings, a certain degree of liquid permeability can be ensured even if the openings are blocked. On the other hand, there are problems that the strength of the open-cell nonwoven fabric decreases and the processability for diapers and the like deteriorates. Furthermore, by using thick fibers without providing openings, the liquid permeability can be improved, but in this case, there is a problem that the softness decreases and the touch is impaired.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 6-330443

[0007] Patent Document 2: Japanese Patent Laid-Open No. 62-276003 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] In view of these circumstances, an object of the present invention is to provide an open-cell nonwoven fabric that has good soft feces permeability even when a load is applied and has excellent softness.

[0010] Means for Solving the Problems

[0011] The inventors of the present invention have made repeated efforts to solve the above problems. As a result, it has been found that residues (burrs) of the non-woven fabric exist near the openings formed by piercing or dispensing as in the past, and when a load is applied, the openings are blocked by the residues, resulting in a decrease in the soft stool permeability. Moreover, it has been found that by forming openings by a method that does not generate residues of the non-woven fabric and making an opening non-woven fabric having a specific opening area ratio and a change rate of the opening area ratio, an opening non-woven fabric that solves the above problems can be obtained, and thus the present invention has been completed.

[0012] That is, the present invention has the following structure.

[0013] [1] An opening non-woven fabric having a plurality of openings, wherein in the opening non-woven fabric, the area ratio (opening area ratio) of the openings is 3% or more, and the change rate of the opening area ratio before and after applying a load (a pressure of 25 g / cm 2 and leaving it for 24 hours) is 30% or less.

[0014] [2] The opening non-woven fabric according to [1], wherein the coefficient of variation of the area (opening area) of the openings after the load is 0.3 or less.

[0015] [3] The opening non-woven fabric according to [1] or [2], wherein the opening area is 1 mm 2 to 50 mm 2 .

[0016] [4] The opening non-woven fabric according to any one of [1] to [3], wherein the specific volume is 10 cm 3 / g to 100 cm 3 / g.

[0017] [5] A method for manufacturing an opening non-woven fabric, which is a method for manufacturing the opening non-woven fabric according to any one of [1] to [4], wherein

[0018] the openings are formed by cutting a part of a base non-woven fabric.

[0019] [6] The method for manufacturing an opening non-woven fabric according to [5], wherein a part of the non-woven fabric is cut by pressing with a roll having a plurality of knives on the surface.

[0020] Effects of the Invention

[0021] According to the present invention, it is possible to provide an opening non-woven fabric that has good soft stool permeability even when a load is applied and is excellent in softness. Description of the Drawings

[0022] Figure 1 is the appearance before the load in Example 1 according to the present invention. ​

[0023] Figure 2 is the appearance after loading according to Embodiment 1 of the present invention.

[0024] Figure 3 is the appearance before loading according to Comparative Example 2 of the present application.

[0025] Figure 4 is the appearance after loading according to Comparative Example 2 of the present application.

[0026] Figure 5 is a schematic diagram of the manufacturing process of the open-cell nonwoven fabric of the present invention.

[0027] Figure 6 is a schematic diagram of the manufacturing process of the conventional open-cell nonwoven fabric. Detailed Description

[0028] The open-cell nonwoven fabric of the present invention is characterized in that it has a plurality of open cells, the area ratio (open cell area ratio) of the open cells is 3% or more, and the change rate of the open cell area ratio is 30% or less. By satisfying such an open cell area ratio and the change rate of the open cell area ratio, it is possible to provide an open-cell nonwoven fabric that has good soft feces permeability even when a load is applied and is excellent in softness.

[0029] The open cells in the present invention refer to the holes that penetrate from the surface to the back of the open-cell nonwoven fabric and are regularly arranged longitudinally, laterally, or obliquely, and are distinguished from the random holes formed between the fibers constituting the nonwoven fabric. Regarding the open cells in the present invention, for example, the open cells can be arranged in series, in parallel, or in an alternating pattern. Whether the open cells are regularly arranged can be judged, for example, by observing with a microscope or visually.

[0030] The open-cell nonwoven fabric may all have open cells of the same shape, or may have a variety of open cells with different shapes or open cell areas. The shape of the open cells is not particularly limited, and examples thereof include circular, elliptical, polygonal, or irregular shapes.

[0031] The area ratio (open cell area ratio) of the open cells in the open-cell nonwoven fabric of the present invention is 3% or more, preferably 5% to 50%, and more preferably 10% to 35%. If the open cell area ratio is 3% or more, the soft feces permeability becomes good, and if it is 50% or less, the strength of the open-cell nonwoven fabric does not decrease excessively, and the processability for fiber products such as diapers becomes good.

[0032] ​​​​​The change rate of the opening area ratio of the open-cell nonwoven fabric of the present invention is 30% or less, preferably 25% or less, and more preferably 20% or less. When the change rate of the opening area ratio is 30% or less, an open-cell nonwoven fabric having good soft feces permeability even when a load is applied can be obtained. The change rate of the opening area ratio of the present invention refers to the ratio of the change in the opening area ratio before and after the application of a load, and the measurement method will be described in detail in the examples.

[0033] The area of the openings (opening area) in the open-cell nonwoven fabric of the present invention is not particularly limited, and is preferably 1 mm 2 to 50 mm 2 , more preferably 3 mm 2 to 40 mm 2 , still more preferably 5 mm 2 to 35 mm 2 . When the opening area is 1 mm 2 or more, the soft feces permeability becomes good, and when it is 50 mm 2 or less, the strength of the open-cell nonwoven fabric does not decrease excessively, and the processability for fiber products such as diapers becomes good. In addition, the opening area of the present invention refers to the area of each opening.

[0034] The coefficient of variation (deviation) of the opening area after loading of the open-cell nonwoven fabric of the present invention is not particularly limited, and is preferably 0.3 or less, more preferably 0.25 or less, and still more preferably 0.2 or less. In addition, when the coefficient of variation of the opening area after loading is 0.3 or less, the areas of the respective openings become uniform, and the nonwoven fabric as a whole can efficiently transmit soft feces.

[0035] The specific volume of the open-cell nonwoven fabric of the present invention is not particularly limited, and is preferably 10 cm 3 / g to 100 cm 3 / g, more preferably 20 cm 3 / g to 90 cm 3 / g. When the specific volume is 10 cm 3 / g or more, the softness is excellent, and when it is 100 cm 3 / g or less, the strength of the nonwoven fabric is not too low, and the processability for fiber products such as diapers becomes good.

[0036] The thickness of the open-cell nonwoven fabric of the present invention is not particularly limited, and is preferably 0.2 mm to 3.0 mm, more preferably 0.4 mm to 1.1 mm. When the thickness is 0.2 mm or more, the softness is excellent, and when it is 3.0 mm or less, the strength of the nonwoven fabric is not too low, and the processability for fiber products such as diapers becomes good.

[0037] The weight per unit area of the open-cell nonwoven fabric is not particularly limited, and is preferably 10 g / m 2 to 50 g / m2 , more preferably 12 g / m 2 ~40 g / m 2 . If the weight per unit area is 10 g / m 2 or more, the strength of the non-woven fabric will not be too low, and the processability of fiber products such as diapers will be good. If it is 50 g / m 2 or less, the softness is excellent.

[0038] The fibers constituting the open-cell non-woven fabric of the present invention may be single-component fibers (single-component fibers), may be composite fibers containing two or more components, or may be a mixture of single-component fibers and composite fibers. In addition, the cross-sectional shape of the fiber is not particularly limited, and any one of circular shapes such as circles or ellipses, square shapes such as triangles or quadrilaterals, irregular shapes such as stars or octofoil shapes, or divided or hollow shapes can be used.

[0039] When the fibers constituting the open-cell non-woven fabric are single-component fibers, there is no particular limitation, and examples include: natural fibers (such as wood fibers), regenerated fibers (such as rayon), semi-synthetic fibers (such as acetate), synthetic fibers (such as polyolefin resins, polyester resins, acrylic resins, nylon resins, vinyl chloride resins, etc.) and other fibers.

[0040] The open-cell non-woven fabric of the present invention is not particularly limited, and preferably contains a heat-sealable composite fiber (heat-sealable composite fiber). Here, the heat-sealable composite fiber refers to a composite fiber that can form a heat-sealed point by heat melting. In addition, the content rate of the heat-sealable composite fiber is not particularly limited, and is preferably 50% by weight or more, more preferably 70% by weight or more. If the content rate of the heat-sealable composite fiber is 50% by weight or more, the fibers can be firmly bonded to each other without using an adhesive, and thus a non-woven fabric with low irritation to the skin and high strength can be obtained.

[0041] When the fibers constituting the open-cell nonwoven fabric are heat-fusible composite fibers, the composite form is not particularly limited, and examples thereof include: concentric sheath-core type, eccentric sheath-core type, side-by-side type, radial type, or sea-island type. In addition, the resin constituting the heat-fusible composite fiber is not particularly limited, and examples thereof include: polyethylene-based resins such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or high density polyethylene (HDPE); crystalline polypropylene (PP); or polypropylene-based resins such as copolymers of propylene and ethylene or α-olefins with propylene as the main component (co-polypropylene (Co-PP)); polyester-based resins such as polyethylene terephthalate (PET), polybutylene terephthalate, or polyester copolymers (co-polyethylene terephthalate (Co-PET)). The combination of resins constituting the heat-fusible composite fiber is not particularly limited, but the melting point difference is preferably 10 °C or more, more preferably 20 °C or more. As specific combinations of high-melting-point resin / low-melting-point resin, examples include PP / HDPE, PP / Co-PP, PET / HDPE, PET / LLDPE, PET / Co-PET, PET / PP. However, from the viewpoints of bulkiness, raw material cost, production stability, etc., the combination of PP / HDPE or PET / HDPE is preferred, and the combination of PET / HDPE is more preferred.

[0042] The heat-fusible composite fiber is not particularly limited, but from the viewpoint of heat fusibility, it is preferably that the low-melting component accounts for 50% or more on the surface of the composite fiber, more preferably 70% or more. In addition, the volume ratio of the high-melting-point resin to the low-melting-point resin is not particularly limited. However, if the ratio of the high-melting-point resin is large, there is a tendency to improve the texture of the nonwoven fabric or fiber product. If the ratio of the low-melting-point resin is large, there is a tendency to increase the bonding point strength between the heat-fusible composite fibers and obtain a nonwoven fabric with high strength. From this viewpoint, the volume ratio of the high-melting-point resin to the low-melting-point resin is preferably 20 / 80 to 80 / 20, more preferably 30 / 70 to 70 / 30.

[0043] Among the fibers constituting the open-cell nonwoven fabric, within the range that does not hinder the effects of the present invention, additives such as antioxidants, light stabilizers, ultraviolet absorbers, neutralizers, nucleating agents, epoxy stabilizers, lubricants, antibacterial agents, deodorants, flame retardants, antistatic agents, pigments, or plasticizers may be contained as needed.

[0044] The fineness of the fiber is not particularly limited, preferably 0.8 dtex to 20 dtex, more preferably 0.9 dtex to 12 dtex, and still more preferably 1.0 dtex to 5.6 dtex. If the fineness is 0.8 dtex or more, in the web forming process using a carding method or the like, it is easy to form a web with excellent fibrillation or texture, and a non-woven fabric having uniform physical properties can be obtained. If it is 20 dtex or less, the softness is excellent.

[0045] The fiber length of the fiber is not particularly limited, preferably 20 mm to 102 mm, more preferably 30 mm to 51 mm. If the fiber length is 20 mm to 102 mm, in the web forming process using a carding method or the like, it is easy to form a web with excellent fibrillation or texture, and a non-woven fabric having uniform physical properties can be obtained.

[0046] The method for manufacturing the open-cell non-woven fabric of the present invention is not particularly limited, and it is preferably to form open cells by cutting a part of the base non-woven fabric. Thus, by cutting the non-woven fabric having the formed open cells, when a load is applied, the open cells are less likely to be blocked by the residues of the non-woven fabric. As a method for cutting a part of the non-woven fabric, for example, a laser processing method or a punching processing method can be cited.

[0047] From the viewpoint of production efficiency, the method for manufacturing the non-woven fabric of the present invention is preferably to cut a part of the non-woven fabric by pressing with a roll having a plurality of blades on the surface. The shape of the blade is not particularly limited as long as it can form open cells by cutting a part of the non-woven fabric. For example, it can be exemplified: circular, elliptical, polygonal, or irregular. In addition, the number of blades, the diameter, or the material of the roll, etc. can be appropriately selected as long as they are within the range capable of forming the open-cell non-woven fabric.

[0048] The base non-woven fabric is not particularly limited, and examples thereof include a thermal bond non-woven fabric, an air-laid non-woven fabric, a spunbond non-woven fabric, a meltblown non-woven fabric, a hydroentangled non-woven fabric, a needled non-woven fabric, or a wet non-woven fabric. However, from the viewpoint of softness or bulkiness, a thermal bond non-woven fabric, an air-laid non-woven fabric, a hydroentangled non-woven fabric, or a spunbond non-woven fabric is preferred, and a thermal bond non-woven fabric is more preferred.

[0049] The apertured nonwoven fabric of the present invention also has good soft feces permeability when a load is applied, and is excellent in softness. Therefore, it can be particularly suitably used as a surface sheet for absorbent articles. In addition, the apertured nonwoven fabric of the present invention not only has good soft feces permeability, but also has good permeability to low-viscosity liquids or air permeability. Therefore, it can be suitably used for absorbent articles such as diapers, sanitary napkins, or incontinence pads, hygiene materials such as masks, gowns, or surgical gowns, interior finishing materials such as wall sheets, window papers, or floor materials, tent fabrics, cleaning wipes, or life-related materials such as covers for domestic waste, toilet articles such as disposable toilets or toilet covers, pet sheets, pet diapers, or pet towels, wiping materials, filters, cushioning materials, oil absorbent materials, or adsorbents for ink cartridges, and various fiber products such as general medical materials, bedding materials, and nursing products that require liquid permeability or air permeability and softness.

[0050] Examples

[0051] Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited thereto. In addition, the measurement methods or definitions of the physical property values shown in the examples are shown below.

[0052] <Fineness of fibers>

[0053] The fineness of the fibers was measured in accordance with Japanese Industrial Standards (JIS) L 1015.

[0054] <Unit area weight of apertured nonwoven fabric>

[0055] The weight of the nonwoven fabric cut out to 100 mm × 100 mm was measured, and the value converted to per unit area was defined as the unit area weight (g / m 2 ) of the apertured nonwoven fabric. The unit area weight of the apertured nonwoven fabric was defined as the average value of two measurements.

[0056] <Thickness of apertured nonwoven fabric>

[0057] Using a laser thickness gauge (IL-S065 manufactured by KEYENCE), a pressure of 3.5 g / cm 2 was applied through a pressure head (load) with a diameter of 35 mm, and the thickness at this time was defined as the thickness of the apertured nonwoven fabric. The thickness of the apertured nonwoven fabric was defined as the average value of two measurements.

[0058] <Specific volume of apertured nonwoven fabric>

[0059] Based on the unit area weight (g / m 2 ) and thickness (mm) of the apertured nonwoven fabric, the specific volume of the apertured nonwoven fabric was calculated by the following formula.

[0060] Specific volume (cm 3 / g) = Thickness (mm) ÷ Weight per unit area (g / m 2 ) × 1000

[0061] <Opening area and coefficient of variation of opening area>

[0062] Use a digital microscope manufactured by KEYENCE Corporation to photograph the open - cell non - woven fabric. Using image - analysis software based on the obtained photos, measure the areas of 10 openings, calculate the average value and the standard deviation. Set the obtained average value as the opening area, and set the value obtained by dividing the standard deviation by the average value as the coefficient of variation of the opening area.

[0063] <Opening area ratio>

[0064] Use a digital microscope manufactured by KEYENCE Corporation to measure the total value of the areas of all openings existing in a 100 mm × 100 mm open - cell non - woven fabric, and calculate the opening area ratio using the following formula.

[0065] Opening area ratio (%) = (Total of opening areas (mm 2 )) / (10000 (mm 2 )) × 100

[0066] <Soft - stool permeability>

[0067] Place the open - cell non - woven fabric on a petri dish. Further, place a cylinder with a diameter of 3.5 cm in the center of the open - cell non - woven fabric, and pour 8.75 g of artificial soft - stool prepared by the following method into the cylinder. After pouring, let it stand for 5 minutes, measure the weight of the artificial soft - stool that has permeated through to the petri dish, and set it as the soft - stool permeation amount. The soft - stool permeation amount is set as the average value when measured twice. The larger the soft - stool permeation amount, the better the soft - stool permeability.

[0068] Preparation method of artificial soft - stool

[0069] Mix and stir the following components (1) - (7), and then dilute with ion - exchanged water to make the viscosity 2000 cP to prepare artificial soft - stool.

[0070] (1) Ion - exchanged water: 71.9 parts by weight

[0071] (2) Sodium chloride: 1.0 part by weight

[0072] (3) Glycerol: 15.0 parts by weight

[0073] (4) Sodium carboxymethyl cellulose: 2.0 parts by weight

[0074] (5) Triton X - 100: 0.05 part by weight

[0075] (6) Powdered cellulose: 10.0 parts by weight

[0076] (7) Acid Blue 9: 0.05 parts by weight

[0077] <Measurement after loading>

[0078] A heavy object was placed on the open - cell non - woven fabric, and a pressure of 25 g / cm 2 was applied, left for 24 hours and then released. One minute after releasing the load, the open - cell area, the coefficient of variation of the open - cell area, the open - cell area ratio, and the soft feces permeability were measured.

[0079] <Rate of change of open - cell area ratio>

[0080] Based on the open - cell area ratios before and after loading, the rate of change of the open - cell area ratio of the open - cell non - woven fabric was calculated by the following formula.

[0081] Rate of change of open - cell area ratio (%) = absolute value of {((open - cell area ratio after loading - open - cell area ratio before loading)÷open - cell area ratio before loading)×100}

[0082] <Softness>

[0083] Twenty professional team members were asked to touch the open - cell non - woven fabric and score it according to the following criteria, and the softness was evaluated based on the total score.

[0084] (1) Criteria

[0085] Good: 2 points

[0086] Average: 1 point

[0087] Poor: 0 points

[0088] (2) Softness evaluation

[0089] ◎: Total score is 31 - 40 points

[0090] ○: Total score is 21 - 30 points

[0091] △: Total score is 11 - 20 points

[0092] ×: Total score is 0 - 10 points

[0093] [Example 1]

[0094] As the base non - woven fabric, a 25 g / m hot - air non - woven fabric containing concentric sheath - core thermally - bondable composite fibers with a fineness of 2.8 dtex, where polyethylene terephthalate is disposed on the core and high - density polyethylene is disposed on the sheath, was prepared. 2 of the hot - air non - woven fabric.

[0095] Subsequently, the base nonwoven fabric is passed between a metal roll having hollow knives on its surface (shape of the knives: ellipse with major diameter of 5 mm and minor diameter of 2.5 mm, number of knives: 2.1 knives / cm 2 (area ratio: 20%)) and a flat metal roll. A part of the nonwoven fabric is cut by pressing the base nonwoven fabric against the knives, thereby obtaining the perforated nonwoven fabric 1. The schematic diagram of the manufacturing process is shown in Figure 5 . The appearances of the obtained perforated nonwoven fabric 1 before and after loading are shown in Figure 1 and Figure 2 .

[0096] [Example 2]

[0097] Except that the number of hollow knives is set to 3.6 knives / cm 2 (area ratio: 35%), the perforated nonwoven fabric 2 is obtained in the same manner as in Example 1.

[0098] [Example 3]

[0099] Except that the number of hollow knives is set to 0.7 knives / cm 2 (area ratio: 7%), the perforated nonwoven fabric 3 is obtained in the same manner as in Example 1.

[0100] [Comparative Example 1]

[0101] A hot air nonwoven fabric containing a concentric sheath-core type thermally adhesive composite fiber with a fineness of 5.6 dtex, having polyethylene terephthalate disposed on the core and high-density polyethylene disposed on the sheath, at 25 g / m 2 is used as the evaluation sample.

[0102] [Comparative Example 2]

[0103] The same base nonwoven fabric as in Example 1 is passed between a metal roll having needles on its surface (shape of the needles: circle with a diameter of 3 mm, number of needles: 4.7 needles / cm 2 (area ratio: 33%)) and a punching roll. The needles pierce the base nonwoven fabric, thereby obtaining the perforated nonwoven fabric 4. The schematic diagram of the manufacturing process is shown in Figure 6 . The appearances of the obtained perforated nonwoven fabric 4 before and after loading are shown in Figure 3 and Figure 4 .

[0104] [Comparative Example 3]

[0105] Except that the shape of the needles is set to a circle with a diameter of 5 mm and the number of needles: 1.8 needles / cm 2 (area ratio: 35%), the perforated nonwoven fabric 5 is obtained in the same manner as in Comparative Example 2.

[0106] The physical properties of the nonwoven fabrics of Examples 1 to 3 and Comparative Examples 1 to 3 are summarized in Table 1.

[0107] [Table 1]

[0108]

[0109] Regarding the perforated nonwoven fabrics of Examples 1 to 3 obtained by cutting a part of the nonwoven fabric, the change in physical properties caused by the load is small and the soft feces permeability is high. In addition, the higher the perforation area ratio, the higher the soft feces permeability.

[0110] On the other hand, compared with Examples 1 to 3, the nonwoven fabric of Comparative Example 1 without perforations, although using thick-fiber yarns, does not allow soft feces to pass through, and furthermore, has poor softness. In addition, regarding the perforated nonwoven fabrics of Comparative Examples 2 to 3 obtained by piercing a part of the nonwoven fabric, the amount of soft feces passing through after the load is poor. The reason is considered to be that when a load is applied, the perforations are blocked by the residues (burrs) around the perforations.

[0111] Industrial applicability

[0112] The nonwoven fabric of the present invention also has good soft feces permeability and excellent softness when a load is applied, and thus can be particularly suitably used as a surface sheet for absorbent articles.

[0113] Explanation of reference numerals

[0114] 11: Base nonwoven fabric

[0115] 12: Perforated nonwoven fabric

[0116] 13: Knife

[0117] 14: Roller having a plurality of knives on the surface

[0118] 15: Flat roller

[0119] 21: Base nonwoven fabric

[0120] 22: Perforated nonwoven fabric

[0121] 23: Needle

[0122] 24: Roller having a plurality of needles on the surface

[0123] 25: Punching roller

Claims

1. An open-cell nonwoven fabric having a plurality of open cells, wherein in the open-cell nonwoven fabric, the area ratio of the open cells (open-cell area ratio) is 3% or more, and the change rate of the open-cell area ratio before and after applying a load (a pressure of 25 g / cm 2 and leaving it for 24 hours) is 30% or less.

2. The apertured nonwoven fabric according to claim 1, wherein, The coefficient of variation of the load of the area of the opening (opening area) is 0.3 or less.

3. The apertured nonwoven fabric according to claim 1 or 2, wherein, The opening area is 1 mm 2 to 50 mm 2 .

4. The apertured nonwoven fabric according to claim 1 or 2, wherein, Specific volume is 10 cm 3 / g to 100 cm 3 / g.

5. A method for manufacturing an apertured nonwoven fabric, which is a method for manufacturing the apertured nonwoven fabric according to claim 1 or 2, wherein the opening is formed by cutting a part of a base nonwoven fabric.

6. The manufacturing method of the apertured nonwoven fabric according to claim 5, wherein, A part of the nonwoven fabric is cut by pressing using a roller having a plurality of blades on its surface.

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