Laminated nonwoven fabric and method for producing the same

Abstract

To provide a nonwoven fabric having higher initial tensile resistance. [Solution] A laminated nonwoven fabric in which fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less is positioned on both surfaces of fiber layer A containing short fibers with a fiber length of less than 20 mm, and fiber layer A and fiber layer B are integrated by entanglement, and when the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, the stresses in the MD direction and CD direction when elongated by 5% from the zero point at standard time are respectively expressed as SD. 5-MD and S.D. 5-CD The stress in the MD and CD directions when stretched 5% from the zero point in the wet state is SW 5-MD and S.W. -CD A laminated nonwoven fabric that satisfies at least one of the following (A1) to (A2): (A1) [SD 5-MD / 5] / [SD 5-CD / 5]≧7.5 (A2) [SW 5-MD / 5] / [SW 5-CD / 5] ≥ 5.25

Description

[Technical Field]

[0001] The present disclosure relates to a laminated nonwoven fabric characterized by initial tensile resistance and a method for producing the same. [Background technology]

[0002] Nonwoven fabrics impregnated with liquids are widely used, for example, to cover the skin of humans or animals and apply a predetermined substance to the skin, or as wipers for wiping dirt off the human body or objects. Various configurations of nonwoven fabrics for impregnating with liquids have been proposed and put to practical use. For example, Patent Document 1 proposes a liquid-impregnated skin-covering sheet comprising an upper fiber layer and a lower fiber layer each containing more than 90% by mass of fibers having a fineness of more than 0.5 dtex, and a cellulosic staple fiber layer containing 50% by mass or more of cellulosic staple fibers positioned between them, the three fiber layers being integrated by entangling the fibers with a hydroentanglement treatment, in which the cellulosic staple fibers are pulp fibers produced from softwood and / or hardwood pulp fibers.

[0003] Patent Document 2 proposes a laminated nonwoven fabric suitable for specific applications, in which a cotton fiber layer containing 50% by mass or more of cotton is positioned on at least one surface of a cellulosic staple fiber layer containing 50% by mass or more of cellulosic staple fibers, with the surface of this layer being the skin-contacting surface, and the cellulosic staple fiber layer and the cotton fiber layer have portions where the cellulosic staple fibers are absent or thin due to entanglement of the fibers by hydroentangling treatment, and the fibers of the cotton fiber layer are entangled and integrated in these portions, the cellulosic staple fiber layer is made of pulp fibers produced using softwood and / or hardwood, and the 10% elongation modulus in the transverse direction is 1.5 N / 5cm or more and 10 N / 5cm or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4592516 [Patent Document 2] Japanese Patent Application Laid-Open No. 4721788 Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure provides a nonwoven fabric made by entangling fibers, which has higher initial tensile resistance. [Means for solving the problem]

[0006] The present disclosure provides a laminated nonwoven fabric in which a fiber layer A containing short fibers with a fiber length of less than 20 mm and a fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less are positioned on both surfaces of the fiber layer A, and the fiber layer A and the fiber layer B are integrated by entanglement, When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, The stress in the MD and CD directions when stretched 5% from the zero point at the standard time, measured in accordance with JIS L 1913 6.3 (tensile strength and elongation), is measured as SD. 5-MD and S.D. 5-CD The stress (N / 5cm) in the MD and CD directions when stretched 5% from the zero point in the wet state is defined as SW 5-MD and S.W. 5-CD When the above conditions are met, the laminated nonwoven fabric satisfies at least one of the following conditions (A1) and (A2): (A1) [SD 5-MD / 5] / [SD 5-CD / 5]≧7.5 (A2) [SW 5-MD / 5] / [SW 5-CD / 5] ≥ 5.25

[0007] The present disclosure also provides a laminated nonwoven fabric comprising a fiber layer A containing short fibers with a fiber length of less than 20 mm and a fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less, the fiber layer A and the fiber layer B being integrated by entanglement, the fabric comprising: When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, The stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point at the standard time, measured in accordance with JIS L 1913 6.3 (tensile strength and elongation), is expressed as SD. 2-MD , S.D. 3-MD The stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point in the wet state is expressed as SW 2-MD , S.W. 3-MD When the above conditions are met, the laminated nonwoven fabric satisfies at least one of the following conditions (C1) to (C4): (C1)3.5≦SD 2-MD ≦15.0 (C2) 6.0≦SD 3-MD ≦17.0 (C3)1.6≦SW 2-MD ≦4.0 (C4)2.3≦SW 3-MD ≦6.0

[0008] The present disclosure also provides a method for producing a laminated web by laminating a fibrous web B containing staple fibers having a fiber length of 20 mm or more and 100 mm or less on both surfaces of a fibrous web A containing short fibers having a fiber length of less than 20 mm; A columnar water stream having a pressure of 1 MPa or more and 10 MPa or less is sprayed onto one or both surfaces of the laminated web 1 to 5 times, After the fiber web is produced, the fiber web is drafted at a draft ratio of 1.03 or more and 1.20 or less until the columnar water stream is sprayed onto the fiber web; At least one of the columnar water jets is a suction water jet, which is performed while the laminate web is placed on a support and the water jet jetted onto the laminate web is sucked. A method for producing a laminated nonwoven fabric is provided. [Effects of the Invention]

[0009] The laminated nonwoven fabric of the present disclosure has a higher MD / CD ratio of initial tensile resistance or a large stress at low elongation, and is less likely to elongate in response to forces applied in the MD direction during processing of the nonwoven fabric and when the product is removed from a packaging container. Therefore, the laminated nonwoven fabric of the present disclosure is less likely to elongate inadvertently during processing and use, making it easier to handle. DETAILED DESCRIPTION OF THE INVENTION

[0010] Depending on the application, liquid-impregnated nonwoven fabrics may be used while being slightly stretched. Examples include face masks and wet wipes attached to jigs. In the case of face masks, the product may be stretched during use to ensure close contact with the skin, and in the case of wet wipes, the product may be stretched to prevent wrinkles when attached to a jig. In this case, it is desirable not to require excessively large force, i.e., it is desirable not to make the modulus at elongation at a predetermined elongation rate excessively large. This point is also described in Patent Documents 1 and 2.

[0011] The inventors have found that decreasing the CD modulus also tends to decrease the MD modulus, and that a decrease in the MD modulus, which makes the fabric more susceptible to stretching, can lead to the following problems. Specifically, in a laminated nonwoven fabric containing a fiber layer containing short fibers, slight stretching occurs in the MD due to forces applied during processing, when removing the product, or when first using the fabric. This stretching can cause product variations or affect product usability and consumer sentiment. For example, stretching of a nonwoven fabric during processing can lead to misalignment of printing, incisions, or other features in designated positions on the product. Even slight stretching can result in product defects depending on the application. Furthermore, even slight stretching that occurs when removing a product from a package or picking up and reassessing the product immediately before use can ruin the new look and leave the user feeling uncomfortable. Alternatively, when a nonwoven fabric is used as a wet wiper and rubbed against an object or person, slight force may cause slight stretching, which may result in creases at the beginning of wiping.

[0012] Although nonwoven fabrics may be intentionally stretched during use depending on their intended purpose, it is desirable to avoid slight stretching due to slight force in situations where stretching is not intended, and this also applies to the MD direction. Therefore, the present inventors conducted research to obtain a laminated nonwoven fabric with an internal fiber layer containing short fibers, which has high initial tensile resistance in the MD direction and is less likely to be inadvertently stretched in the MD direction. As a result, the present inventors were able to obtain a nonwoven fabric with relatively high resistance to initial tensile force in the MD direction by setting the MD / CD ratio, calculated by dividing the force required to stretch from 0% elongation to 5% elongation by the increment in elongation, within a predetermined range and by increasing the stress at low elongation in the MD direction. The fibers constituting the nonwoven fabric of this embodiment will be first described below.

[0013] [Short fiber] The fiber layer A of this embodiment contains short fibers having a fiber length of less than 20 mm. When the short fibers are chemical fibers such as rayon or synthetic fibers, the fiber length of the short fibers is measured according to JIS L 1015:2010 (method C). The fiber length of the short fibers may be, for example, 0.7 mm or more and 20 mm or less, particularly 0.8 mm or more and 15 mm or less, and more particularly 0.9 mm or more and 10 mm or less.

[0014] The short fibers may be any of synthetic fibers, cellulosic fibers, natural fibers other than cellulosic fibers, and inorganic fibers.

[0015] Examples of cellulosic fibers include the following: (1) Natural fibers derived from plants such as cotton, flax, flax, ramie, jute, banana, bamboo, kenaf, shell ginger, hemp, and kapok; (2) solvent-spun cellulose fibers such as viscose-derived rayon and polynosic, cupra obtained by the cuprammonium process, and solvent-spun Tencel® and Lyocell, as well as other regenerated fibers; (3) Cellulose fibers obtained by melt spinning; (4) Semi-synthetic fibers such as acetate fibers; and (5) Pulp such as mechanical pulp, recycled pulp, and chemical pulp

[0016] The fineness of the cellulose-based fiber is not particularly limited. The fineness of the cellulose-based fiber may be 0.2 dtex or more and 22.0 dtex or less. The fineness of the cellulose-based fiber may be 0.3 dtex or more, 0.8 dtex or more, or 1.0 dtex or more. The fineness of the cellulose-based fiber may be 14.0 dtex or less, 10.0 dtex or less, 6.7 dtex or less, or 4.4 dtex or less. In one embodiment, the fineness of the cellulose-based fiber is 0.6 dtex or more and 4.4 dtex or less. Since it is difficult to adjust the fineness of natural fibers, cellulose-based fibers with finenesses outside the above range may be used. In the case of natural fibers, the fineness may be measured by a method based on the Micronaire method described in JIS L 1019:2006 7.4.1 "Measurement of Fineness by ISO Method." In the case of recycled fibers, the measurement may be performed using a method conforming to the vibration method described in JIS L 1015:2010 8.5 ISO method (reference method) for measuring fineness.

[0017] The cellulose-based fiber may have a fiber diameter of 5.0 μm or more and 23.0 μm or less. The cellulose-based fiber may have a fiber diameter of 6.0 μm or more, 7.0 μm or more, or 8.0 μm or more. The cellulose-based fiber may have a fiber diameter of 22.0 μm or less, 21.0 μm or less, or 20.0 μm or less. The fiber diameter of the cellulose-based fiber is determined, for example, by observing the fabric with an electron microscope at approximately 400x magnification, and determining the diameter of the fiber cross section. Furthermore, when the fiber cross section is noncircular, the fiber diameter is the average of the length of the major axis of the fiber cross section and the longest distance between two points on the fiber cross section perpendicular to the major axis.

[0018] Synthetic fibers are usually made of a thermoplastic resin. There are no particular limitations on the thermoplastic resin. Examples of the thermoplastic resin include aromatic polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and polyethylene naphthalate; aliphatic polyester resins such as polylactic acid, polyglycolic acid, poly(β-hydroxybutyric acid), poly(β-hydroxyacetic acid-co-β-hydroxyvaleric acid), poly-β-propiolactone, poly-ε-caprolactone, polyethylene succinate, and copolymers thereof; and aliphatic-aromatic polyester resins in which an aromatic polyester and an aliphatic polyester are copolymerized (for example, butylene adipate-co- Polyolefin resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, propylene copolymers with propylene as the main component (including propylene-ethylene copolymer and propylene-butene-1-ethylene copolymer), ethylene-vinyl alcohol copolymer, and ethylene-vinyl acetate copolymer; polyamide resins such as nylon 6, nylon 12, and nylon 66; acrylic resins; polyurethane resins; engineering plastics such as polycarbonate, polyacetal, polystyrene, and cyclic polyolefins, and their elastomers.

[0019] Synthetic fibers may be monofilaments, in which the fiber cross section is composed of a single component (also referred to as a "single section"), and / or conjugate fibers, in which the fiber cross section is composed of multiple components (also referred to as "sections"). Conjugate fibers may be, for example, concentric or eccentric sheath-core conjugate fibers, islands-in-the-sea conjugate fibers, side-by-side conjugate fibers, or splittable conjugate fibers. The cross section of the fiber may be circular or noncircular. Noncircular shapes include elliptical, Y-shaped, X-shaped, I-shaped, multilobal, polygonal, and star-shaped. Synthetic fibers may also have a hollow cross section. In both monofilaments and conjugate fibers, each section constituting the fiber may be composed of a single resin, or a mixture of two or more resins.

[0020] The fineness of the synthetic fibers is, for example, 0.4 dtex or more and 4.0 dtex or less. The fineness of the synthetic fibers may be 0.5 dtex or more, 0.6 dtex or more, 0.9 dtex or more, or 1.1 dtex or more. The fineness of the synthetic fibers may be 4.0 dtex or less, 2.6 dtex or less, 2.4 dtex or less, or 2.2 dtex or less. The method for measuring the fineness is as described above in relation to cellulosic fibers.

[0021] The synthetic fibers may have a fiber diameter of 6.0 μm or more and 20.0 μm or less. The fiber diameter of the synthetic fibers may be 6.5 μm or more, 7.5 μm or more, 9.0 μm or more, or 10.0 μm or more. The fiber diameter of the synthetic fibers may be 19.0 μm or less, 16.0 μm or less, or 15.0 μm or less. The method for determining the fiber diameter of synthetic fibers is as described above in relation to cellulosic fibers.

[0022] Examples of natural fibers that are not cellulosic fibers include silk, wool, animal hair, etc. Examples of inorganic fibers include glass fibers, metal fibers, and carbon fibers.

[0023] In this embodiment, pulp may be used as the short fibers. Pulp is hydrophilic and tends to be well entangled with the fibers of the fiber layers B located on both sides of the fiber layer A when a laminated nonwoven fabric is produced by the hydroentangling method described below. The pulp-containing fiber layer A can also be provided in the form of a wet-laid nonwoven fabric known as tissue paper before being entangled with the fiber layer B, as described below, facilitating the production of the nonwoven fabric. Furthermore, pulp itself is hydrophilic, making it easy to impregnate the nonwoven fabric with liquid and to retain the liquid. Furthermore, pulp tends to exist in a fibrillated state, making it easy to entangle the fibers when entangling them using the method described below. Pulp also has a flat shape, and when dry, hydrogen bonds are formed between the flat surfaces, resulting in relatively high strength and improving runnability during product processing. However, when wet, the hydrogen bonds are released, allowing the nonwoven fabric to be flexible.

[0024] Pulp may be produced by conventional methods using, for example, softwood or hardwood, specifically, mechanical pulp, chemical pulp, or recycled pulp. Alternatively, non-wood pulp made from plant fibers, including straw, bamboo, bagasse, esparto, other reeds and grasses, cotton linters, Manila hemp, flax, hemp, ramie, kenaf, rags, and other textile waste, may be used. When pulp is used as short fibers, the pulp fineness may be, for example, about 1.0 to 4.0 dtex, particularly about 1.3 to 3.5 dtex, and the fiber length may be, for example, 0.8 mm to 4.0 mm, particularly 1.0 mm to 3.0 mm, and more particularly 1.2 mm to 2.0 mm, although pulp with a fineness and / or fiber length outside these ranges may also be used. When the short fibers are pulp, the fiber length of the pulp is measured by the length-weighted average fiber length according to JIS P 8226-2 (2011 edition) Pulp - Optical Automatic Analysis Method.

[0025] [Staple fiber] The fiber layer B of this embodiment contains staple fibers having a fiber length of 20 mm or more and 100 mm or less. The fiber length of the staple fibers is measured according to JIS L 1015:2010 (method C) in the case of synthetic fibers, and is measured as a length-weighted average fiber length using a fiber length measurement system manufactured by REMIER (https: / / www.berthold-jp.com / fibershape / ) in the case of natural fibers such as cotton. The staple fibers may have a fiber length of, for example, 20 mm or more and 100 mm or less, particularly 22 mm or more and 70 mm or less, and more particularly 30 mm or more and 64 mm or less.

[0026] Staple fibers may be synthetic fibers, cellulosic fibers, natural fibers other than cellulosic fibers, or inorganic fibers, examples of which are as described above in connection with short fibers.

[0027] In this embodiment, cellulosic fibers may be used as staple fibers. Cellulosic fibers are generally hydrophilic, and therefore tend to be well entangled with the fiber layer A when a laminated nonwoven fabric is produced by the hydroentanglement method described below. Hydrophilic cellulosic fibers also facilitate impregnation of the nonwoven fabric with liquid and facilitate retention of liquid. Furthermore, since many cellulosic fibers are natural fibers or fibers made from natural materials, they have a good feel to the touch. In addition, cellulosic fibers have the advantage of being readily accepted by environmentally conscious consumers and / or consumers who are highly interested in natural materials.

[0028] As the cellulosic fiber, for example, regenerated fibers, particularly rayon, and cotton can be used. Regenerated fibers are preferably used because the fineness can be easily adjusted and there is little variation. Among the regenerated fibers, rayon can make the nonwoven fabric soft. Cotton is a natural fiber that has a proven track record of being widely used in products that come into contact with the skin, such as underwear, and is therefore preferably used in applications where the fabric comes into contact with the skin.

[0029] When cellulosic fibers are used as staple fibers, synthetic fibers may be used in combination. The combined use of synthetic fibers improves the strength of the nonwoven fabric and allows the strength of the nonwoven fabric to be adjusted according to the application. Furthermore, the combined use of synthetic fibers increases the bending resistance of the nonwoven fabric in the wet state compared to when only cellulosic fibers are used, and allows the bending resistance to be adjusted according to the application. Furthermore, synthetic fibers have mechanical or three-dimensional crimps, and these crimps are firm, which facilitates good entanglement of fibers in the CD. Therefore, by using synthetic fibers together with staple fibers, the breaking elongation of the nonwoven fabric in the CD can be increased, making it easier to obtain a nonwoven fabric that is resistant to tearing.

[0030] As synthetic fibers, for example, polyester monofilaments such as polyethylene terephthalate can be used. Compared to other synthetic fibers, polyester fibers tend to produce bulkier nonwoven fabrics. Furthermore, because polyester fibers are flexible and strong, their use in combination with cellulose fibers facilitates the production of strong, flexible, and tear-resistant nonwoven fabrics. Polyolefin monofilaments such as polypropylene can also be used as synthetic fibers. Because polyolefin monofilaments themselves have water-repellent properties, they can reduce entanglement during hydroentanglement. This prevents overentanglement and allows the nonwoven fabric to be flexible. As staple synthetic fibers, splittable conjugate fibers whose cross section is composed of multiple sections may also be used. When splittable conjugate fibers are used to produce nonwoven fabrics using the water jet production method described below, some or all of the sections split to form smaller fibers, thereby making the nonwoven fabric denser and smoother to the touch. The splittable conjugate fiber may be made of, for example, a combination of polyethylene terephthalate / polyethylene, polypropylene / polyethylene, or polyethylene terephthalate / polypropylene. Of these, a combination of polyester and polyethylene has good splitting properties during hydroentanglement and tends to provide a nonwoven fabric with a good texture.

[0031] [Fiber layer A] Next, the fiber layer A constituting the nonwoven fabric of this embodiment will be described. The fiber layer A is a fiber layer containing short fibers with a fiber length of less than 20 mm. The fiber layer A contains short fibers, for example, at least 50 mass%, particularly at least 60 mass%, and more particularly at least 70 mass%. The fiber layer A may be composed only of short fibers. When the fiber layer A is composed only of short fibers, the entanglement with the fiber layer B is improved.

[0032] Before being integrated with fibrous layer B, fibrous layer A may be in the form of a wetlaid web, a wetlaid nonwoven fabric, an airlaid web, or an airlaid nonwoven fabric. A wetlaid nonwoven fabric in which fibrous layer A is made only of pulp is also called tissue. In these webs or nonwoven fabrics, the fiber orientation is relatively random, which makes it easy to improve the texture of the nonwoven fabric after lamination. However, the form of fibrous layer A before being integrated with fibrous layer B is not limited to these and may be, for example, a carded web or other nonwoven fabric form.

[0033] The fibrous layer A may be, for example, made only of pulp and provided in the form of a wet-laid nonwoven fabric before being integrated with the fibrous layer B. The wet-laid nonwoven fabric made of pulp may be crepe paper.

[0034] [Fiber layer B] Next, the fiber layer B constituting the nonwoven fabric of this embodiment will be described. The fiber layer B is a fiber layer containing staple fibers with a fiber length of 20 mm or more and 100 mm or less. The fiber layer B contains, for example, 50% by mass or more of staple fibers, particularly 70% by mass or more, and more particularly 80% by mass or more of staple fibers. The fiber layer B may be composed solely of staple fibers. When the fiber layer B is composed solely of staple fibers and does not contain fibers with a fiber length of less than 20 mm and / or fibers with a fiber length of more than 100 mm, a nonwoven fabric having the elongation properties described below is more likely to be obtained. Furthermore, when the fiber layer B is composed solely of staple fibers and does not contain short fibers, fiber ends are less likely to protrude from the surface of the nonwoven fabric, which makes it easier to improve the feel of the nonwoven fabric.

[0035] The fibrous layer B may be in any form such as a carded web, air-laid web, or wet-laid web, such as a parallel web, cross web, semi-random web, or random web, before being integrated with the fibrous layer A. The fibrous web is preferably in the form of a parallel web or semi-random web, since this results in a smoother surface of the nonwoven fabric.

[0036] As described above, the fibrous layer B may contain cellulosic fibers. The cellulose fibers may comprise, for example, 40% by mass or more, particularly 60% by mass or more, and more particularly 70% by mass or more, based on 100% by mass of the staple fibers contained in the fibrous layer B. The fibrous layer B may be composed solely of cellulose fibers.

[0037] Alternatively, fiber layer B may contain 40% by mass or more and 100% by mass or less, particularly 70% by mass or more and 100% by mass or less, of cellulosic fibers, with the remaining staple fibers being synthetic fibers, assuming the total amount of staple fibers in fiber layer B to be 100% by mass. The significance of using cellulosic fibers and synthetic fibers in combination is as explained above in the section on staple fibers. Examples of cellulosic fiber / synthetic fiber combinations include rayon / polyethylene terephthalate fiber, rayon / polypropylene fiber, rayon / splittable composite fiber (e.g., polyethylene terephthalate / polyethylene), lyocell / polyethylene terephthalate fiber, lyocell / polypropylene fiber, lyocell / splittable composite fiber, cotton / polyethylene terephthalate fiber, and cotton / splittable composite fiber.

[0038] [Laminated nonwoven fabric] The nonwoven fabric of this embodiment is a laminated nonwoven fabric in which fiber layer B is located on both surfaces of fiber layer A, and fiber layer A and fiber layer B are integrated by entanglement. In the nonwoven fabric of this embodiment, it is preferable that the fibers are not integrated by bonding. A nonwoven fabric in which the fibers are not bonded to each other has a better feel and is softer. The fiber layers B located on both surfaces of the fiber layer A may be the same fiber layer or different fiber layers. The two fiber layers B may, for example, differ from each other in the type and / or proportion of cellulosic fiber and / or may have different basis weights from each other.

[0039] The basis weights of the fiber layer A and the fiber layer B are appropriately selected depending on the desired basis weight of the laminated nonwoven fabric. The basis weight of the fiber layer A may be selected, for example, so as not to exceed 60 mass% of the basis weight of the entire laminated nonwoven fabric, particularly so as not to exceed 50 mass%, more particularly 10 to 45 mass%, and even more particularly 10 to 35 mass%. If the proportion of the fiber layer A exceeds 60 mass% (i.e., if the proportion of the fiber layer B is 40 mass% or less in total), the entire sheet becomes paper-like and the texture becomes hard, resulting in poor adhesion to the skin when the laminated nonwoven fabric is used as a liquid-impregnated skin dressing sheet. On the other hand, if the proportion of the fiber layer A is small (i.e., if the proportion of the fiber layer B is large), the laminated nonwoven fabric may have poor formation. For example, if the proportion of the fiber layer A is 60 to 100 g / m 2 In order to obtain a laminated nonwoven fabric of this size, the basis weight of the fiber layer A is 10 to 40 g / m 2 degree, especially 15-30g / m 2 The weight of the fiber layer B is preferably about 10 to 50 g / m 2 The basis weight of the fiber layers B may be the same as that of the other fiber layer B, as described above, or may be different from each other. For example, the basis weight of one fiber layer B may be about 2 to 3 times that of the other fiber layer B.

[0040] The basis weight of the nonwoven fabric of this embodiment is, for example, 40 to 150 g / m 2 In particular, 50 to 120 g / m 2 and more particularly 60 to 100 g / m 2 The weight of the nonwoven fabric is 40 g / m 2 If the density is less than 150 g / m, the absolute amount of liquid will be small when the liquid is impregnated, and the fabric may not feel firm when held in the hand. 2 If it exceeds this, it will become too thick and difficult to handle.

[0041] The nonwoven fabric of this embodiment may have a configuration in which the fibers are entangled by a hydroentanglement treatment, and the fibrous layer A and the fibrous layers B located on both surfaces thereof are integrated together. A nonwoven fabric in which the fibers are entangled by a hydroentanglement treatment has better texture.

[0042] The nonwoven fabric of this embodiment has a longitudinal direction defined as the MD direction and a width direction defined as the CD direction. The stresses (N / 5cm) in the MD direction and the CD direction when stretched 5% from the zero point at standard time, as measured in accordance with JIS L 1913 6.3 (tensile strength and elongation), are respectively SD 5-MD and S.D. 5-CD The stress (N / 5cm) in the MD and CD directions when stretched 5% from the zero point in the wet state is defined as SW 5-MD and S.W. 5-CD When the above formula is used, the laminated nonwoven fabric satisfies at least one of the following (A1) to (A2): (A1) [SD 5-MD / 5] / [SD 5-CD / 5]≧7.5 (A2) [SW 5-MD / 5] / [SW 5-CD / 5] ≥ 5.25

[0043] In the above (A1) and (A2), SD 5-MD , S.D. 5-CD , S.W. 5-MD , S.W. 5-CD The value obtained by dividing by the increment of elongation rate (i.e., "5", which is the difference between an elongation rate of 0% and an elongation rate of 5%) is used. This value corresponds to the Young's modulus when elongated from 0% to 5%.

[0044] The reason for dividing the equivalent Young's modulus in the MD direction under standard conditions (i.e., dry conditions) and under wet conditions by the equivalent Young's modulus in the CD direction is to evaluate the elongation properties at low elongation due to fiber orientation while minimizing the influence of the fiber material. Specifically, the stress and Young's modulus at low elongation are affected by both the fiber orientation and the fiber material, making it difficult to accurately compare the degree of tensile resistance due to fiber orientation based on the absolute values ​​of the stress and modulus at elongation. Furthermore, in a laminated nonwoven fabric including a fiber layer A containing short fibers, as in this embodiment, the fiber layer A serves to suppress elongation in the CD direction, but the stress and Young's modulus at CD elongation are affected by the fiber layer A. In this embodiment, the value obtained by dividing the equivalent Young's modulus in the MD direction by the equivalent Young's modulus in the CD direction is used to reduce the influence of the fiber material and the fiber layer A and evaluate the elongation properties due to fiber orientation.

[0045] By satisfying the above (A1) and / or (A2), the nonwoven fabric is less likely to elongate slightly in the MD due to inadvertent force. Furthermore, by satisfying the above (A1) and / or (A2), the nonwoven fabric has good bendability, improving the product processability of the dry nonwoven fabric. Furthermore, when a nonwoven fabric that satisfies the above (A1) or (A2) is stretched and applied to an object such as the skin in a wet state, an appropriate amount of stress is applied to the nonwoven fabric in all directions, including the MD, CD, and diagonal directions, making it less likely to cause discomfort when applied to the object.

[0046] [SD 5-MD / 5] / [SD 5-CD / 5] may in particular be 7.5 or more, more in particular 8.5 or more, with an upper limit of, for example, 40, in particular 30. [SD 5-MD / 5] / [SD 5-CD If [SW / 5] is too large, the initial tensile resistance in the CD direction becomes too small compared to that in the MD direction, and the MD / CD balance of the nonwoven fabric regarding elongation is not achieved, which can make it difficult to use as a product. 5-MD / 5] / [SW 5-CD / 5] may in particular be 5.0 or more, more in particular 5.5 or more, with an upper limit of, for example, 30, in particular 20.

[0047] Alternatively, the nonwoven fabric of this embodiment has a stress (N / 5cm) in the MD direction when stretched by 2% and 3% from the zero point at the standard time, respectively. 2-MD , S.D. 3-MD The stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point in the wet state is expressed as SW 2-MD , S.W. 3-MD When the above formula is set as above, at least one selected from the following (C1) to (C4) may be satisfied. (C1)3.5≦SD 2-MD ≦15.0 (C2) 6.0≦SD 3-MD ≦17.0 (C3)1.6≦SW 2-MD ≦4.0 (C4)2.3≦SW 3-MD ≦6.0

[0048] The above (C1) to (C4) correspond to the stress when the elongation rate is extremely small, and it is presumed that the stress at such low elongation rates is less affected by the fiber material, and the magnitude of the stress is largely due to the fiber orientation. By satisfying one or more of the above (C1) to (C4), slight stretching in the MD due to inadvertent force is less likely to occur. Furthermore, by satisfying one or more of the above (C1) to (C4), the nonwoven fabric has good bendability, improving the product processability of the nonwoven fabric in a dry state.

[0049] SD 2-MD SD may be particularly 3.5 or more, more particularly 4.0 or more and 15.0 or less, and more particularly 10.0 or less. 3-MD SW may be particularly 6.0 or more, more particularly 6.5 or more and less, particularly 17.0 or less, and more particularly 15.0 or less. 2-MDSW may be particularly 1.6 or more, more particularly 1.7 or more and less, particularly 4.0 or less, more particularly 3.5 or less. 3-MD may in particular be 2.3 or more, more in particular 2.4 or more and in particular 6.0 or less, more in particular 5.0 or less.

[0050] A nonwoven fabric that satisfies one or more of the above (C1) to (C4) may further satisfy at least one selected from the above (A1) and (A2), thereby making the nonwoven fabric more stable and exhibiting higher resistance to initial tension both in the dry and wet states.

[0051] The laminated nonwoven fabric of the present embodiment that satisfies any one or more of the above (A1) and (A2) and / or any one or more of the above (C1) to (C4) further has a stress (N / 5cm) in the CD direction when elongated by 5% and 10% from the zero point at standard time, respectively, that is greater than or equal to SD 5-CD , S.D. 10-CD The stress in the CD direction (N / 5cm) when stretched 5% and 10% from the zero point in the wet state is expressed as SW 5-CD , S.W. 10-CD and the basis weight (g / m 2 ) is BW, the material may satisfy at least one of the following (B1) to (B2): (B1)[(SD 10-CD -SD 5-CD ) / 5] / BW≦0.00350 (B2) [(SW 10-CD -SW 5-CD ) / 5] / BW≦0.000980

[0052] (SD 10-CD -SD 5-CD ) corresponds to the stress required to elongate the nonwoven fabric in the CD direction from 5% elongation to 10% elongation under standard conditions (i.e., dry conditions), and (SW 10-CD -SW 5-CD) correspond to the stress required to elongate a nonwoven fabric in the CD direction from a 5% elongation state to 10% elongation when wet. These values ​​are divided by the increment in elongation rate (i.e., "5," which is the difference between 5% and 10%), and then divided by the basis weight to evaluate the CD extensibility of the nonwoven fabric due to fiber orientation. If a nonwoven fabric satisfies the above (B1) or (B2), the nonwoven fabric can be easily elongated with little force when it is wetted with a liquid and brought into contact with an object while being stretched, or when it is brought into contact with an object and then stretched.

[0053] [(SD 10-CD -SD 5-CD ) / 5] / BW may particularly be 0.00350 or less, more particularly 0.00280 or less. 10-CD -SW 5-CD ) / 5] / BW may in particular be less than or equal to 0.00098, more in particular less than or equal to 0.00095.

[0054] Alternatively, the laminated nonwoven fabric of the present embodiment that satisfies one or more of the above (A1) and (A2) further has a stress (N / 5cm) in the CD direction when elongated by 5% and 15% from the zero point at the standard time, respectively, in the SD direction. 5-CD , S.D. 15-CD The stress in the CD direction (N / 5cm) when stretched 5% and 15% from the zero point in the wet state is expressed as SW 5-CD , S.W. 15-CD and the basis weight (g / m 2 ) is BW, the following may satisfy at least one selected from (B3) to (B4): (B3)[(SD 15-CD -SD 5-CD ) / 10] / BW≦0.00300 (B4) [(SW 15-CD -SW 5-CD ) / 10] / BW≦0.000970

[0055] (SD 15-CD -SD 5-CD) corresponds to the stress required to elongate the nonwoven fabric in the CD direction from 5% elongation to 15% elongation under standard conditions (i.e., dry conditions). 15-CD -SW 5-CD ) corresponds to the stress required to elongate a nonwoven fabric in the CD direction from a 5% elongation state to 15% elongation when wet. The value obtained by dividing these values ​​by the increment in elongation rate (i.e., "10," the difference between 5% and 15%) and then dividing this value by the basis weight can be used to evaluate the CD extensibility of a nonwoven fabric due to fiber orientation, as with (B1) and (B2). If a nonwoven fabric satisfies (B3) or (B4) above, when the nonwoven fabric is wetted with a liquid and stretched while being brought into close contact with an object, the nonwoven fabric can be stretched more smoothly from the start to the end of the elongation process.

[0056] [(SD 15-CD -SD 5-CD ) / 10] / BW may be particularly 0.00300 or less, more particularly 0.00280 or less, with the lower limit being, for example, 0.0010, particularly 0.00120. 15-CD -SW 5-CD ) / 10] / BW may in particular be less than or equal to 0.00097, more in particular less than or equal to 0.00040, the lower limit of which is for example 0.00030, in particular 0.00040.

[0057] In the above-described (A1) to (A2) and (B1) to (B4), the basis weight of the fiber layer A is 13 to 27 g / m 2 The weight per fiber layer B is 23 to 87 g / m 2 The weight of the entire nonwoven fabric is 50 to 100 g / m 2 When such a laminated nonwoven fabric satisfies any one of (A1) to (A2) and, optionally, any one of (B1) to (B4), it can be a nonwoven fabric that is superior in practical use.

[0058] The above-described (A1) to (A2) and (B1) to (B4) are believed to be due to the influence of fiber orientation in the nonwoven fabric. As described below, the laminated nonwoven fabric of this embodiment can be produced by a production method that includes spraying a water stream while suctioning onto a laminated web placed on a support, and drafting the fiber web at a draft ratio of 1.03 to 1.30 after producing the fiber web and before spraying the columnar water stream. This production method includes spraying a columnar water stream while suctioning and drafting the fiber web at a draft ratio within the specified range, which is believed to further strengthen the orientation of the fibers in the MD direction and increase the initial tensile resistance in the MD direction. Furthermore, if crimps exist in the fibers, the drafting process slightly elongates the crimps and entangles them, which is believed to also increase the initial tensile resistance in the MD direction. On the other hand, once the elongation has progressed to a certain extent, the destruction of the fiber layer A made of short fibers progresses, and the high tensile resistance does not continue. For example, the stress at 20% elongation tends to be smaller than that of a nonwoven fabric produced without suction of the columnar water flow and without applying a draft.

[0059] In this embodiment, the stress at 20% elongation in the MD direction may be, for example, 15 N / 5 cm or more and 80 N / 5 cm or less, particularly 20 N / 5 cm or more and 70 N / 5 cm or less, and more particularly 25 N / 5 cm or more and 60 N / 5 cm or less, under standard conditions (dry conditions), and may be, for example, 5 N / 5 cm or more and 40 N / 5 cm or less, particularly 9 N / 5 cm or more and 35 N / 5 cm or less, and more particularly 10 N / 5 cm or more and 32 N / 5 cm or less under wet conditions. The stress at 20% elongation in the CD direction of this embodiment may be, for example, 1 N / 5 cm to 5 N / 5 cm, particularly 1.5 N / 5 cm to 4.5 N / 5 cm, and more particularly 2 N / 5 cm to 4 N / 5 cm, under standard (dry) conditions; and may be, for example, 0.5 N / 5 cm to 3.0 N / 5 cm, particularly 0.7 N / 5 cm to 2.5 N / 5 cm, and more particularly 1.0 N / 5 cm to 2.3 N / 5 cm, under wet conditions. The stress at 20% elongation is an indicator of the force applied when a product containing the nonwoven fabric of this embodiment is used under tension; if this stress is too small, the product may stretch more than intended by the user, whereas if this stress is too large, the product may not adhere well to the skin, for example, when used as a liquid-impregnated skin dressing sheet.

[0060] [Manufacturing method of laminated nonwoven fabric] The nonwoven fabric of this embodiment is A laminated web is produced by laminating a fibrous web B containing staple fibers having a fiber length of 20 mm or more and 100 mm or less on both surfaces of a fibrous web A containing short fibers having a fiber length of less than 20 mm; and A columnar water stream having a pressure of 1 MPa or more and 10 MPa or less is sprayed onto one or both surfaces of the laminated web 1 to 5 times, After the fiber web is produced, the fiber web is drafted at a draft ratio of 1.03 or more and 1.30 or less until the columnar water stream is sprayed; At least one of the columnar water jets is a suction water jet, which is performed while placing the laminated web on a support and sucking the water jet jetted onto the laminated web. It can be produced by a production method.

[0061] Fiber web A is the web that will become fiber layer A, and fiber web B is the web that will become fiber layer B. The types and proportions of fibers contained in fiber webs A and B are as described above in relation to fiber layers A and B. The basis weights of fiber webs A and B are also as described above in relation to fiber layers A and B. The forms of fiber webs A and B are also as described above in relation to fiber layers A and B.

[0062] The hydroentanglement treatment is carried out by placing the laminated fiber web on a support and spraying a columnar water stream onto it. The hydroentanglement treatment may be carried out by spraying water streams at a water pressure of 1 MPa to 10 MPa onto each of the front and back surfaces of the laminated fiber web 1 to 5 times from nozzles having orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less, spaced 0.2 mm or more and 1.5 mm or less. The water pressure is preferably 1 MPa to 15 MPa, more preferably 1 MPa to 10 MPa.

[0063] The manufacturing method of this embodiment includes drafting the fibrous web at a draft ratio of 1.03 to 1.30 between the preparation of the fibrous web and the spraying of the columnar water stream. Drafting the fibrous web refers to applying tension to the fibrous web between the preparation of the fibrous web and the spraying of the columnar water stream, for example, by increasing the speed of the support conveying the fibrous web when the columnar water stream is sprayed on it compared to the feed speed of the fibrous web. The tension increases with the draft ratio (corresponding to the ratio of the web conveying speed immediately after the web is discharged from the carding machine to the speed immediately after the water stream is sprayed on it). In this embodiment, the draft ratio may be particularly preferably 1.05 to 1.27, more particularly preferably 1.07 to 1.24. Furthermore, when the fibers constituting fibrous web B are chemical or synthetic fibers with a relatively long fiber length (35 mm or longer), the draft ratio may be particularly preferably 1.05 to 1.25, more particularly preferably 1.07 to 1.16. When the fibers constituting the fibrous web B have a relatively short fiber length or an inconstant fiber length (for example, in the case of natural fibers), the β-molecular weight ratio may be particularly 1.07 or more and 1.25 or less, more particularly 1.10 or more and 1.24 or less.

[0064] The draft ratio can be adjusted, for example, on a production line, by creating a difference between the delivery speed of the fibrous web (e.g., the exit speed immediately after the web is discharged from a carding machine) and the line speed immediately before the water stream is sprayed, or by pulling the web using a drafter. Drafting of the fibrous web may be carried out throughout the entire process from the production of the fibrous web until the spraying of the columnar water stream, or may be carried out only in some of the processes. When drafting is carried out in some of the processes, the draft ratio is defined as the ratio of the conveying speed of the fibrous web at the start of the process to the conveying speed of the fibrous web at the end of the process.

[0065] By setting the draft ratio within the above range, the fibers in the fibrous web B are more likely to be aligned (oriented) in the MD direction. If the draft ratio is too small, the orientation in the MD direction hardly progresses, the stress at low elongation in the MD direction becomes small, and a nonwoven fabric satisfying the above (A1) etc. cannot be obtained. If the draft ratio is too large, the fibers in the web are more likely to become entangled, and a uniform nonwoven fabric cannot be obtained.

[0066] Because fibrous web A contains short fibers, it is less susceptible to drafting. In particular, in a wetlaid papermaking web or wetlaid papermaking nonwoven fabric made of pulp fibers, the pulp fibers are believed to be substantially bonded together by hydrogen bonds, making it less susceptible to drafting. Furthermore, if fibrous web A is crepe paper, the wrinkled portions tend to stretch in the MD direction. It is believed that only the wrinkled portions stretch during drafting, resulting in little change in fiber orientation. Furthermore, even when crepe paper is drafted, the width of the fibrous web in the CD direction is unlikely to change, which also reduces changes in fiber orientation in fibrous web A. The lack of change in fiber orientation in fibrous web A is believed to prevent excessive stretching of the laminated web in the MD direction during drafting, which would result in a reduction in the CD dimension. Furthermore, the entangled fibrous layer A is also believed to play a role in resisting stretching at low MD elongation rates.

[0067] In the manufacturing method of this embodiment, at least one of the columnar water jets is performed as a suction water jet, in which the water jetted onto the laminated web is sucked in. The suction water jet is performed by placing the laminated web on a support having a warp diameter of 0.05 mm to 0.2 mm, a weft diameter of 0.05 mm to 0.2 mm, and a mesh number of 70 to 110 (for example, a plain weave support of 80 to 100 mesh made by weaving monofilaments in a plain weave), or a support made of punched metal.

[0068] A support made of perforated metal is a support in which openings are formed in a metal plate, and the areas between the openings that do not allow the passage of water flow (non-opening areas) are wider than, for example, a mesh-like support made of monofilaments woven in a plain weave. In these non-opening areas and near the openings, the suction of the water flow is thought to locally make the orientation of the fibers relatively random and partially strengthen the entanglement of the fibers. On the other hand, compared to a mesh-like support made of monofilaments woven in a plain weave, a support made of perforated metal tends to have a lower overall degree of entanglement of the fibers because water hitting the non-opening areas "scatters" the fibers.

[0069] The suction water jet may be carried out once or more times with one side of the laminate web in contact with a support made of punched metal, and once or more times with the other side of the laminate web in contact with a support made of punched metal.

[0070] The support made of punched metal has an area of ​​0.05 mm 2 Over 3.0mm 2 The openings, each having an area of ​​0.05 mm or less, may be regularly arranged so that the opening ratio of the surface of the support is 7% or more and 26% or less. Such a support makes it easy to obtain a nonwoven fabric having the elongation properties of this embodiment. The area per opening is particularly preferably 0.05 mm or less. 2 Over 3.0mm 2 Below, more particularly 0.07 mm 2 Over 1.50mm 2 The opening ratio may be 7% or more and 26% or less, more particularly 9% or more and 25% or less. The shape of the opening may be circular, elliptical, triangular, square, rectangular, etc., and may be circular.

[0071] For example, a support made of perforated metal may have openings of the same shape and size arranged in a staggered pattern at 45° or 60°. The angle of the staggered arrangement corresponds to the base angle of an isosceles triangle formed by connecting the openings. Such a support can more uniformly spray the suction water flow, making the entire surface of the nonwoven fabric more uniform. Such a support may have, for example, circular openings with a diameter of 0.13 mm to 1.96 mm, arranged in a staggered pattern with a diagonal pitch (the distance between the centers of the openings) of 0.90 mm to 1.50 mm and a horizontal pitch of 0.9 mm to 1.5 mm. Alternatively, a support made of perforated metal may have openings of the same shape and size arranged in a lattice pattern (i.e., the openings are arranged at the intersections of the lattice).

[0072] The water flow is sucked by applying negative pressure to the side of the support opposite to the side on which the nonwoven fabric is placed. The negative pressure may be applied so that the pressure (air pressure) on the side of the support opposite to the side on which the nonwoven fabric is placed is, for example, 2 kPa or more and 20 kPa or less. It is believed that by applying negative pressure to suck the water flow, the water that hits the non-opening parts of the support flows toward the openings, thereby partially strengthening the entanglement of the fibers.

[0073] The support used when performing the suction water jetting may be cylindrical. In this case, the water jet is suctioned from the inside of the cylinder. By using a cylindrical support and performing the suction water jetting from the inside of the cylinder, the device can be simplified, and the fiber web can be easily attached to the support, allowing the fibers to be efficiently entangled.

[0074] In the manufacturing method of this embodiment, before the suction water jetting is performed, a water jet flowing down in a film form may be applied to the laminated web placed on the support. By applying the water jet flowing down in a film form, the adhesion of the laminated web to the support can be improved during the suction water jetting, and the suction water jetting can be performed more efficiently. The water jet flowing down in a film form may be applied to the laminated web using a flow coater. Furthermore, the water jet flowing down in a film form may be sucked by negative pressure, which further improves the adhesion of the laminated web to the support. The negative pressure may be, for example, 2 kPa or more and 20 kPa or less.

[0075] In addition to suction water jetting, the hydroentanglement treatment may also include water jetting without suction (hereinafter referred to as "non-suction water jetting" for convenience). Non-suction water jetting may be performed to further entangle the fibers and / or to improve the texture of the nonwoven fabric. Non-suction water jetting may be performed by placing the nonwoven fabric on a support made of punched metal or a plain-weave mesh support.

[0076] In the manufacturing method of this embodiment, non-suction water jetting may be performed on one side of the laminate web and suction water jetting may be performed on the other side. Alternatively, non-suction water jetting and suction water jetting may be performed on one side of the laminate web. In either case, non-suction water jetting may be performed either before or after suction water jetting. Alternatively, in the manufacturing method of this embodiment, only the suction water jetting may be performed.

[0077] In both suction water jetting and non-punched metal water jetting, the water jet may be jetted from a nozzle having orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less, spaced at intervals of 0.2 mm or more and 1.5 mm or less. The distance between the nozzle and the web may be, for example, 5 mm to 100 mm, and particularly 10 mm to 50 mm.

[0078] The nonwoven fabric of this embodiment described above or a nonwoven fabric produced by the production method of this embodiment is particularly suitable for applications in which it is impregnated with a liquid, such as skin application sheets, wet wipes, disposable hand towels, and patches.

[0079] When the nonwoven fabric of this embodiment is impregnated with a liquid to be used as a liquid-impregnated skin-covering sheet for personal use, such as a face mask, an exfoliating sheet, or a décolleté sheet, the nonwoven fabric may be impregnated with a liquid containing an active ingredient (e.g., a cosmetic) in an amount of 500 to 2000 parts by mass, particularly 600 to 1800 parts by mass, and more particularly 700 to 1500 parts by mass, per 100 parts by mass of the nonwoven fabric. Examples of active ingredients include, but are not limited to, moisturizing ingredients, exfoliating ingredients, antiperspirant ingredients, fragrance ingredients, whitening ingredients, blood circulation-promoting ingredients, UV protection ingredients, and slimming ingredients.

[0080] The face mask is provided in a shape suitable for covering the face, and further has openings or cutouts formed by punching, for example, in areas corresponding to the eyes, nose, and mouth, as needed. Alternatively, the face mask may be shaped to cover only a portion of the face (for example, the eyes, mouth, nose, or cheeks). Alternatively, the face mask may be provided as a set consisting of a sheet that covers the area around the eyes and a sheet that covers the area around the mouth, or as a set of sheets that separately cover three or more areas.

[0081] The exfoliating sheet is a skin covering sheet used on areas such as the heels, elbows, and knees where the keratin is thick and prone to hardening. By impregnating it with a liquid containing a keratin softening component and a moisturizing component, it exhibits the effect of promoting moisturizing and softening of the keratin, or the effect of promoting the removal of excess keratin. The nonwoven fabric of this embodiment can be used as a substrate for exfoliating sheets that exhibit either of these effects and efficacy. Exfoliating sheets, for example, exfoliating sheets for the heel, are provided in a form with slits and / or notches and / or openings punched out in parts of the sheet so that the sheet can easily conform to the curve of the heel when applied.

[0082] The liquid-impregnated skin covering sheet may be a moisturizing sheet impregnated with a liquid containing a moisturizing ingredient or other active ingredient, which is used to moisturize or otherwise care for any part of the body (for example, the neck, the back of the hands, or the area from the neck to the chest (also known as the décolleté)). Alternatively, the liquid-impregnated skin covering sheet may be a slimming sheet impregnated with a liquid containing a slimming ingredient. The slimming sheet is used by being attached to the thighs or abdomen, for example.

[0083] When the nonwoven fabric of this embodiment is used as a wet wiper, a disposable hand towel, or the like, it may be impregnated with water or an aqueous solution containing a cleaning component in an amount of 100 to 1,000 parts by mass per 100 parts by mass of the nonwoven fabric. The amount of impregnation may be 150 parts by mass or more, 700 parts by mass or less, or 500 parts by mass or less per 100 parts by mass of the nonwoven fabric.

[0084] Wet wipers may be for either personal use or for object use. When used for personal use, they can be used as wet tissues or baby wipes. When used for object use, they may be used to wipe floors, kitchens, toilets, bathtubs, furniture, vehicles, walls, screen doors, window glass, etc. Object wipers may be used by attaching them to a jig having a wiper attachment part at the end of a rod-shaped object. [Example]

[0085] The present embodiment will be described below with reference to examples. [Fiber layer A (fiber web A)] As a constituent of the fiber layer A, the following wetlaid nonwoven fabric was prepared. Wetlaid nonwoven fabric 1: A mixture of chemical pulp made from softwood and hardwood, with a basis weight of 17 g / m and 100% pulp by mass. 2 A wet-laid nonwoven fabric was prepared. The pulp had a length-weighted average fiber width of 29.1 μm and a length-weighted average fiber length of 1.43 mm. Wetlaid nonwoven fabric 2: A mixture of chemical pulp made from softwood and hardwood, with a basis weight of 26.4 g / m and 100% pulp by mass. 2 A wet-laid nonwoven fabric was prepared. The pulp had a length-weighted average fiber width of 29.1 μm and a length-weighted average fiber length of 1.43 mm. The mechanical properties of the wetlaid nonwoven fabrics 1 and 2 are as follows:

[0086] [Table 1]

[0087] [Staple fiber] As staple fibers constituting the fiber layer B, the following fibers were prepared. Rayon 1: Rayon with a fineness of 1.7 dtex and a fiber length of 40 mm (manufactured by Lenzing, product name SPV) Cotton: Cotton with a length-weighted average fiber length of 23 mm (Marusan Sangyo Co., Ltd., product name: MSD Cotton) PET fiber: Single fiber made of polyethylene terephthalate with a fineness of 1.45 dtex and a fiber length of 38 mm (manufactured by Toray Industries, Inc., product name T403D)

[0088] Example 1 A blend of 80% rayon and 20% PET fiber, with a target weight of 21.5 g / m 2Fiber web B was produced using a semi-random carding machine. This fiber web B was placed on both surfaces of wetlaid nonwoven fabric 1, which was fiber web A, to produce a laminated web, and this laminated web was subjected to a hydroentanglement treatment. The hydroentanglement treatment was carried out by transporting the laminated fiber web on a cylindrical support made of a punched metal with an opening ratio of 10% and circular openings with a hole diameter of 0.35 mm arranged in a 60° staggered pattern at a pitch of 1.05 mm. First, a columnar water stream at a water pressure of 3.5 MPa was sprayed once onto one side of the laminated fiber web from a nozzle with 0.12 mm orifices spaced 1.0 mm apart, and a columnar water stream at a water pressure of 5.0 MPa was sprayed once onto the other side from a nozzle with 0.13 mm orifices spaced 1.0 mm apart, and a columnar water stream at a water pressure of 4.5 MPa was sprayed once onto the other side from a nozzle with 0.10 mm orifices spaced 0.6 mm apart. The water streams were sprayed from the inside of the cylindrical support to one side while suction was applied at a negative pressure of 11 kPa, and to the other side while suction was applied at a negative pressure of 5.0 kPa. The hydroentanglement treatment was carried out while rotating the cylindrical support so that the conveying speed of the laminated web was 58 m / min, and the draft ratio, which is the ratio of the conveying speed of the laminated web during the hydroentanglement treatment to the supply speed of the laminated web, was set to 1.12.

[0089] Example 2 A blend of 80% rayon and 20% PET fiber, with a target weight of 31.8 g / m 2The fiber web B was produced using a semi-random carding machine. A laminated web was produced by placing this fiber web B on both surfaces of the wetlaid nonwoven fabric 2 (the fiber web A), and this laminated web was subjected to a hydroentanglement treatment. First, while the laminated fiber web was being transported on the same punched metal cylindrical support as used in Example 1, a columnar water stream at a water pressure of 2.0 MPa was sprayed once from a nozzle with 0.12 mm orifices spaced 1.0 mm apart on one side, a columnar water stream at a water pressure of 4.0 Pa was sprayed once from a nozzle with 0.12 mm orifices spaced 1.0 mm apart, and a columnar water stream at a water pressure of 6.0 MPa was sprayed once from a nozzle with 0.12 mm orifices spaced 1.0 mm apart. The hydroentanglement treatment performed on the punched metal support was performed while suctioning the water stream from the inside of the cylindrical support at a negative pressure of 13 kPa. After the suction water jet, the laminate was placed on a 90-mesh plain weave support, and a columnar water jet was sprayed once from a nozzle with 0.13 mm orifices spaced 1.0 mm apart on the other side at a water pressure of 5.5 MPa, and once from a nozzle with 0.12 mm orifices spaced 0.63 mm apart at a water pressure of 5.0 MPa. The hydroentanglement treatment was carried out at a draft ratio of 1.12.

[0090] Example 3 Using only rayon 1, basis weight 21.5g / m 2Fiber web B was produced using a semi-random carding machine. This fiber web B was placed on both surfaces of wetlaid nonwoven fabric 1, which was fiber web A, to produce a laminated web, and this laminated web was subjected to a hydroentanglement treatment. The hydroentanglement treatment was carried out by conveying the laminated fiber web on a cylindrical support made of the same punching metal as used in Example 1, and spraying a columnar water stream at a water pressure of 4.0 MPa once from a nozzle having 0.10 mm orifices spaced 0.6 mm apart on one side, and a columnar water stream at a water pressure of 3.5 MPa once from a nozzle having 0.12 mm orifices spaced 1.2 mm apart on the other side. Then, spraying a columnar water stream at a water pressure of 3.5 MPa once from a nozzle having 0.13 mm orifices spaced 1.0 mm apart on the other side, and a columnar water stream at a water pressure of 4.0 MPa once from a nozzle having 0.10 mm orifices spaced 0.6 mm apart on the other side. The water jet was sprayed onto one surface while suctioning at a negative pressure of 11 kPa, and onto the other surface while suctioning at a negative pressure of 5.0 kPa. The hydroentanglement treatment was carried out while rotating the cylindrical support so that the conveying speed of the laminated web was 51.8 m / min, and the draft ratio, which is the ratio of the conveying speed of the laminated web during the hydroentanglement treatment to the supply speed of the laminated web, was set to 1.12.

[0091] Example 4 Using only cotton, the target weight is 15.8g / m 2The fiber web B was produced using a semi-random carding machine. A laminated web was produced by placing this fiber web B on both surfaces of the wetlaid nonwoven fabric 2, which was the fiber web A, and this laminated web was subjected to a hydroentanglement treatment. First, while the laminated fiber web was being transported on the same punched metal cylindrical support as used in Example 1, a columnar water stream at a water pressure of 4.0 MPa was sprayed once on one side from a nozzle with 0.08 m orifices spaced 0.65 mm apart, a columnar water stream at a water pressure of 4.5 MPa was sprayed once from a nozzle with 0.12 mm orifices spaced 0.65 mm apart, and a columnar water stream at a water pressure of 3.5 MPa was sprayed once from a nozzle with 0.12 mm orifices spaced 1.0 mm apart. The hydroentanglement treatment performed on the punched metal support was performed while suctioning the water stream from the inside of the cylindrical support at a negative pressure of 9 kPa. After the water jet suction, the laminate was placed on a 90-mesh plain weave support, and a columnar water jet was sprayed once onto the other side from a nozzle with 0.12 mm orifices spaced 1.0 mm apart at a water pressure of 4.0 MPa. The water jet entanglement treatment was carried out at a draft ratio of 1.21.

[0092] (Comparative Example 1) A blend of 80% rayon and 20% PET fiber, with a target weight of 21.5 g / m 2 Fiber web B was produced using a parallel carding machine. This fiber web B was placed on both surfaces of wetlaid nonwoven fabric 1, which was fiber web A, to produce a laminated web, and this laminated web was subjected to a hydroentanglement treatment. The hydroentanglement treatment was carried out by placing the laminated web on a 90-mesh plain weave support and transporting it at a speed of 4 m / min, spraying a water stream at a water pressure of 3 MPa once on one side of the web and once on the other side, followed by a drying treatment to obtain a laminated nonwoven fabric. The water stream was sprayed from a nozzle equipped with orifices with a hole diameter of 0.12 mm spaced 0.6 mm apart. No draft was applied to the fiber web during the water stream spraying.

[0093] (Comparative Example 2) Using only rayon 1, basis weight 21.5g / m 2A laminated nonwoven fabric was produced in the same manner as in Comparative Example 1, except that the fiber web B was produced using a parallel carding machine.

[0094] (Comparative Example 3) Using only cotton, the target weight is 21.5g / m 2 A laminated nonwoven fabric was produced in the same manner as in Comparative Example 1, except that the fiber web B was produced using a parallel carding machine.

[0095] The evaluation of the nonwoven fabrics was carried out as follows. In each example and comparative example, samples for measuring the physical properties in the standard and wet states were separately produced using the above-mentioned method. Therefore, the nonwoven fabrics used for the standard and wet state measurements were from different production lots, resulting in some variation. Therefore, the basis weight and other properties of the nonwoven fabrics used for each evaluation are listed in the standard and wet state columns. <Thickness and bulk density of nonwoven fabric> The thickness of the nonwoven fabric was measured using a thickness gauge (THICKNESS GAUGE Model CR-60A (trade name) manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) while a load of 0.3 kPa or 1.96 kPa was applied to the nonwoven fabric. The bulk density was calculated from the thickness and basis weight when a load of 0.3 kPa was applied.

[0096] <Tensile strength, elongation> Tensile strength was measured in accordance with JIS L 1913:2010 6.3 using a constant-speed tension tensile tester with dry samples under conditions of 5 cm sample width, 10 cm grip spacing, and a tensile speed of 30±2 cm / min. The load at break (tensile strength), elongation, and stress required to elongate a specified amount were measured. The tensile test was conducted in the machine direction (MD) and cross direction (CD) of the nonwoven fabric. The evaluation results are all shown as the average of values ​​measured for three samples. The wet measurement was carried out by impregnating 100 parts by mass of the sample with 250 parts by mass of distilled water. The elongation percentage (%) used to determine the stress at elongation is as shown in the table below.

[0097] <Sensory evaluation> Evaluations were conducted for the following items (1) to (4), and the total score for each item was calculated. Note that in all evaluations, scoring was performed in increments of 0.5. (1) Processability of nonwoven fabrics during product processing Five samples measuring 30 cm length (MD direction) x 26 cm width (CD direction) were stacked and then punched out simultaneously into the shape of a face mask using a Thomson blade. Five panelists visually inspected the punching process and the punched samples, and scored the workability according to the following criteria. 5: When the nonwoven fabric was punched into a face shape, it was easy to cut and no fluff was produced, demonstrating good processability. 4: When the nonwoven fabric is punched into a face shape, it breaks easily and produces a small amount of fuzz, but the processability is good. 3: When the nonwoven fabric was punched into the face shape, it was easy to break and some areas were fused to the face shape, but the processability was "suitable." 2: When the nonwoven fabric was punched into the face shape, it broke easily, but there were areas that were fused to the face shape and a large amount of fluff was produced, so the processability was "suitable." 1: When the nonwoven fabric was punched into a face mold, it was difficult to cut and fused to the face mold so it could not be removed, making the processability "unsuitable."

[0098] (2) Ease of removing the product from the packaging 100 parts by mass of nonwoven fabric punched into the shape of a face mask was impregnated with 1,000 parts by mass of distilled water. The left and right sides of the face mask were then folded in half, and the top and bottom were folded in half, and placed in a product bag (pouch). Five monitors rated the ease of removing the nonwoven fabric from the pouch according to the following criteria, and the average was calculated. 5: When removed from the packaging, it does not stretch at all. 4: When removing from the packaging, it stretches but can still be used without any problems. 3: When you take it out of the packaging, it stretches, and when you apply it to your face, you can see the stretched areas, but it is still usable. 2: When removing from the packaging, the product adheres to the packaging and stretches, losing its shape, but it is still usable. 1: When removing from the packaging, the small area around the eyes and nose broke and became unusable.

[0099] (3) Ease of application to the skin As in (2) above, the ease of application of the face-shaped nonwoven fabric impregnated with distilled water to the skin was evaluated according to the following criteria, and the average was calculated. 5: It has a moderate amount of stretch and is easy to apply to the face if you can align it with the eye position. 4: It has a moderate amount of stretch and is easy to apply to the face if you can align the eyes and mouth properly. 3: The nonwoven fabric has little stretch, so it can be stretched lengthwise and widthwise with just enough force to prevent the shape of the product from being distorted. 2: The product has little stretch, and even if you apply a force that does not cause the product to crumble, it will not stretch and the stitches will not align, making it difficult to use. 1: It has little stretch, and when stretched to align the eyes and nose, small areas such as between the eyes tear, making the product unusable.

[0100] (4) Less likely to wrinkle A 10 cm x 10 cm nonwoven fabric was prepared and impregnated with 500 parts by mass of distilled water for every 100 parts by mass of nonwoven fabric. The resistance to creasing when rubbed against the arm was evaluated according to the following criteria, and the average was calculated. 5: No wrinkles even after rubbing more than 10 times 4: After rubbing 10 times, wrinkles appear. 3: After rubbing five times, wrinkles appear. 2: After rubbing it three times, it becomes wrinkled. 1: The tape becomes wrinkled when you first start rubbing it, making it impossible to rub.

[0101] The evaluation results of each example and each comparative example are shown in Tables 2 and 3.

[0102] [Table 2]

[0103] [Table 3]

[0104] The nonwoven fabrics of Examples 1 to 4 all satisfied the previously described (A1) and (A2), as well as (C1) to (C4), and (B1) to (B4). In contrast, none of Comparative Examples 1 to 3 satisfied (A1) and (A2), or (C1) to (C4). Furthermore, when Example 1 and Comparative Example 1, Example 3 and Comparative Example 2, and Example 4 and Comparative Example 3, which all had the same fiber layer structure, were compared, the Examples had larger (A1) and (A2), smaller (B1) to (B4), and larger (C1) to (C4). This difference is thought to be due to the fact that the Examples were all produced by a manufacturing method that included suction water jet injection and drafting at a predetermined draft ratio, resulting in a different fiber entanglement state compared to the Comparative Examples, which were produced without drafting. Furthermore, in the examples, suction water jetting was performed using a punched metal, and it is believed that the change in fiber orientation occurs due to the fine uneven pattern formed on the surface of the nonwoven fabric by the punched metal, which is reflected in the difference in elongation properties between the examples and comparative examples. Furthermore, all of the Examples received high scores in the sensory evaluation and were excellent in terms of processability into products and ease of use after the products were made.

[0105] The present embodiment includes the following aspects. (Aspect 1) A laminated nonwoven fabric in which a fiber layer A containing short fibers with a fiber length of less than 20 mm and a fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less are positioned on both surfaces of the fiber layer A, and the fiber layer A and the fiber layer B are integrated by entanglement, When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, The stress in the MD and CD directions when stretched 5% from the zero point at the standard time, measured in accordance with JIS L 1913 6.3 (tensile strength and elongation), is measured as SD. 5-MDand S.D. 5-CD The stress (N / 5cm) in the MD and CD directions when stretched 5% from the zero point in the wet state is defined as SW 5-MD and S.W. 5-CD A laminated nonwoven fabric that satisfies at least one of the following (A1) and (A2): (A1) [SD 5-MD / 5] / [SD 5-CD / 5]≧7.5 (A2) [SW 5-MD / 5] / [SW 5-CD / 5] ≥ 5.25 (Aspect 2) A laminated nonwoven fabric in which a fiber layer A containing short fibers with a fiber length of less than 20 mm and a fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less are positioned on both surfaces of the fiber layer A, and the fiber layer A and the fiber layer B are integrated by entanglement, When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, The stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point at the standard time, measured in accordance with JIS L 1913 6.3 (tensile strength and elongation), is expressed as SD. 2-MD , S.D. 3-MD The stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point in the wet state is expressed as SW 2-MD , S.W. 3-MD A laminated nonwoven fabric that satisfies at least one of the following (C1) to (C4): (C1)3.5≦SD 2-MD ≦15.0 (C2) 6.0≦SD 3-MD ≦17.0 (C3)1.6≦SW 2-MD ≦4.0 (C4)2.3≦SW 3-MD ≦6.0 (Aspect 3) The stress in the CD direction (N / 5cm) when stretched 5% and 10% from the zero point at standard time is SD 5-CD , S.D. 10-CDThe stress in the CD direction (N / 5cm) when stretched 5% and 10% from the zero point in the wet state is expressed as SW 5-CD , S.W. 10-CD and the basis weight (g / m 2 3. The laminated nonwoven fabric of claim 1, which satisfies at least one of the following (B1) to (B2), where BW is the total length of the nonwoven fabric. (B1)[(SD 10-CD -SD 5-CD ) / 5] / BW≦0.00350 (B2) [(SW 10-CD -SW 5-CD ) / 5] / BW≦0.000980 (Aspect 4) The stress in the CD direction (N / 5cm) when stretched 5% and 15% from the zero point at standard time is SD 5-CD , S.D. 15-CD The stress in the CD direction (N / 5cm) when stretched 5% and 15% from the zero point in the wet state is expressed as SW 5-CD , S.W. 15-CD and the basis weight (g / m 2 4. The laminated nonwoven fabric of any one of Aspects 1 to 3, wherein, when BW is BW, at least one of the following (B3) to (B4) is satisfied: (B3)[(SD 15-CD -SD 5-CD ) / 10] / BW≦0.00300 (B4) [(SW 15-CD -SW 5-CD ) / 10] / BW≦0.000970 (Aspect 5) A laminated nonwoven fabric according to any one of aspects 1 to 4, wherein the fiber layer A contains 50% by mass or more of the short fibers, and the fiber layer B contains 50% by mass or more of the staple fibers. (Aspect 6) A laminated nonwoven fabric according to any one of aspects 1 to 5, wherein the fiber layer A contains pulp as the short fibers. (Aspect 7) The laminated nonwoven fabric of any one of Aspects 1 to 6, wherein the fibrous layer A is a wetlaid nonwoven fabric. (Aspect 8) Aspect 8. The laminated nonwoven fabric of any one of aspects 1 to 7, wherein the staple fibers are cellulosic fibers. (Aspect 9) The fiber layer A has a basis weight of 10 g / m 2 More than 40g / m 2 the fiber layer B has a basis weight of 10 g / m or less 2 More than 50g / m 2 A laminated nonwoven fabric according to any one of Aspects 1 to 9, which is as follows: (Aspect 10) A wet laminated nonwoven fabric, in which the laminated nonwoven fabric of any one of Aspects 1 to 9 is impregnated with a liquid. (Aspect 11) A face mask, comprising the laminated nonwoven fabric of any one of Aspects 1 to 9 impregnated with a liquid. (Aspect 12) A laminated web is produced by laminating a fibrous web B containing staple fibers having a fiber length of 20 mm or more and 100 mm or less on both surfaces of a fibrous web A containing short fibers having a fiber length of less than 20 mm; and A columnar water stream having a pressure of 1 MPa or more and 10 MPa or less is sprayed onto one or both surfaces of the laminated web 1 to 5 times, After the fiber web is produced, the fiber web is drafted at a draft ratio of 1.03 or more and 1.30 or less until the columnar water stream is sprayed onto the fiber web, At least one of the columnar water jets is a suction water jet, which is performed while the laminate web is placed on a support and the water jet jetted onto the laminate web is sucked. A method for manufacturing a laminated nonwoven fabric. (Aspect 13) A method for producing a laminated nonwoven fabric according to aspect 12, wherein the support used for the suction water jetting is a support made of a punched metal. (Aspect 14) A method for producing a laminated nonwoven fabric according to aspect 12 or 13, wherein the suction water stream spraying is performed one or more times with one surface of the laminate web in contact with the support made of the perforated metal, and the suction water stream spraying is performed one or more times with the other surface of the laminate web in contact with the support made of the perforated metal. (Aspect 15) The support made of the punched metal has an area of ​​0.05 mm 2 Over 3.00mm2 15. The method for producing a laminated nonwoven fabric according to aspect 13 or 14, wherein the openings having the following properties are regularly arranged so that the open area ratio of the surface of the support is 7% or more and 26% or less. (Aspect 16) 16. The method for producing a laminated nonwoven fabric according to any one of Aspects 13 to 15, wherein the support made of punched metal has openings of the same shape and size arranged in a staggered pattern. (Aspect 17) 17. The method for producing a laminated nonwoven fabric according to any one of Aspects 13 to 16, wherein in the suction water jetting, the support made of the punched metal has a cylindrical shape, and the water jet is sucked from inside the cylinder. [Industrial Applicability]

[0106] The nonwoven fabric of the present disclosure has a laminated structure in which a staple fiber-containing fiber layer A is flanked on both surfaces by a staple fiber-containing fiber layer B, and the MD / CD ratio, calculated by dividing the force required to elongate the fabric from 0% to 5% elongation by the increment in elongation, satisfies a predetermined range. This nonwoven fabric has relatively high initial tensile resistance in the MD direction, making it less likely to be inadvertently stretched in the MD direction during product processing or use. Therefore, the nonwoven fabric of the present disclosure can provide easy-to-use products when used in liquid-impregnated skin application sheets, wet wipes, and the like.

Claims

1. A laminated nonwoven fabric in which a fiber layer A containing short fibers with a fiber length of less than 20 mm and a fiber layer B containing staple fibers with a fiber length of 20 mm or more and 100 mm or less are positioned on both surfaces of the fiber layer A, and the fiber layer A and the fiber layer B are integrated by entanglement, When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, JIS L 1913 6 3 (tensile strength and elongation), the stress (N / 5cm) in the MD and CD directions when stretched 5% from the zero point at standard time is measured in accordance with SD. 5-MD and S.D. 5-CD The stresses (N / 5cm) in the MD and CD directions when the nonwoven fabric is wetted with 100 parts by mass of distilled water and stretched 5% from the zero point are respectively SW 5-MD and S.W. 5-CD When the following (A1) and (A2) are satisfied, (A1) [S] 5-MD / 5] / [AD 5-CD / 5]≧10.0 (A2)SW 5-MD / 5] / [SW 5-CD / 5]≧5.25 The ratio of the basis weight of the fiber layer A to the basis weight of the entire laminated nonwoven fabric does not exceed 50 mass%. Laminated nonwoven fabric.

2. When the longitudinal direction of the nonwoven fabric is defined as the MD direction and the width direction is defined as the CD direction, JIS L 1913 6 3 (tensile strength and elongation), the stress in the MD direction (N / 5cm) when stretched 2% and 3% from the zero point at standard time is measured in accordance with SD 2-MD , S.D. 3-MD The stress (N / 5cm) in the MD direction when the nonwoven fabric is stretched by 2% and 3% from the zero point in a wet state in which 100 parts by mass of the nonwoven fabric is impregnated with 250 parts by mass of distilled water is SW 2-MD , S.W. 3-MD The laminated nonwoven fabric according to claim 1, which satisfies at least one of the following (C1) to (C4): (C1)3.5≦SD 2-MD ≦15.0 (C2)6.0≦SD 3-MD ≦17.0 (C3)1.6≦SW 2-MD ≦4.0 (C4)2.3≦SW 3-MD ≦6.0

3. The stress in the CD direction (N / 5cm) when stretched 5% and 10% from the zero point at standard time is SD 5-CD , S.D. 10-CD The stress (N / 5cm) in the CD direction when the nonwoven fabric is stretched by 5% and 10% from the zero point in a wet state in which 100 parts by mass of the nonwoven fabric is impregnated with 250 parts by mass of distilled water is calculated as SW 5-CD , S.W. 10-CD and the basis weight (g / m ２ 2. The laminated nonwoven fabric according to claim 1, wherein, when BW is the total length of the nonwoven fabric, the laminated nonwoven fabric satisfies at least one of the following conditions (B1) to (B2): (B1) [(SD 10-CD -SD 5-CD ) / 5] / BW≦000350 (B2) (SW) 10-CD -SW 5-CD ) / 5] / BW≦0.000980

4. The stress in the CD direction (N / 5cm) when stretched 5% and 15% from the zero point at standard time is SD 5-CD , S.D. 15-CD The stress (N / 5cm) in the CD direction when the nonwoven fabric is stretched by 5% and 15% from the zero point in a wet state in which 250 parts by mass of distilled water is impregnated with 100 parts by mass of the nonwoven fabric is measured. 5-CD , S.W. 15-CD and the basis weight (g / m ２ 2. The laminated nonwoven fabric according to claim 1, wherein, when BW is BW, at least one selected from the following (B3) to (B4) is satisfied: (B3) (SD) 15-CD -SD 5-CD ) / 10] / BW≦0.00300 (B4)[(SW 15-CD -SW 5-CD ) / 10] / BW≦0.000970

5. 2. The laminated nonwoven fabric according to claim 1, wherein the fiber layer A contains 50% by mass or more of the short fibers, and the fiber layer B contains 50% by mass or more of the staple fibers.

6. The laminated nonwoven fabric according to claim 1 , wherein the fiber layer A contains pulp as the short fibers.

7. The laminated nonwoven fabric according to claim 6 , wherein the fibrous layer A is a wetlaid nonwoven fabric.

8. 10. The laminated nonwoven fabric of claim 1, wherein the staple fibers are cellulosic fibers.

9. The fiber layer A has a basis weight of 10 g / m ２ 40g / m or more ２ The fiber layer B has a basis weight of 10 g / m or less. ２ 50g / m or more ２ 2. The laminated nonwoven fabric of claim 1, wherein:

10. A wet laminated nonwoven fabric, which is obtained by impregnating the laminated nonwoven fabric according to any one of claims 1 to 9 with a liquid.

11. A face mask, comprising the laminated nonwoven fabric according to any one of claims 1 to 9 impregnated with a liquid.

12. A laminated web is produced by laminating a fibrous web B containing staple fibers having a fiber length of 20 mm or more and 100 mm or less on both surfaces of a fibrous web A containing short fibers having a fiber length of less than 20 mm; and A water column having a pressure of 1 MPa or more and 10 MPa or less is sprayed onto one or both surfaces of the laminated web 1 to 5 times, After the laminated fiber web is produced, the laminated fiber web is drafted at a draft ratio of 1.03 or more and 1.30 or less until the columnar water stream is sprayed thereon; At least one of the columnar water jets is a suction water jet, which is performed while the laminate web is placed on a support and the water jet jetted onto the laminate web is sucked. A method for manufacturing a laminated nonwoven fabric.

13. The method for producing a laminated nonwoven fabric according to claim 12, wherein the support used for the suction water jetting is a support made of a punched metal.

14. The method for producing a laminated nonwoven fabric according to claim 13, wherein the suction water stream spraying is carried out one or more times with one surface of the laminated web in contact with the support made of the punched metal, and is carried out one or more times with the other surface of the laminated web in contact with the support made of the punched metal.

15. The support made of the punched metal has an area of ​​0.05 mm ２ Over 3.00 mm ２ The method for producing a laminated nonwoven fabric according to claim 13, wherein the openings having a size of 0.1 to 1.5 mm are regularly arranged so that the opening ratio of the surface of the support is 7% to 26%.

16. The method for producing a laminated nonwoven fabric according to claim 15, wherein the support made of the perforated metal has openings of the same shape and size arranged in a staggered pattern.

17. The method for producing a laminated nonwoven fabric according to claim 13, wherein in the suction water jetting, the support made of the punched metal has a cylindrical shape, and the water jet is sucked from inside the cylinder.

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