Laminated nonwoven fabric and method for producing the same, liquid-impregnated sheet, liquid-impregnated sheet, and face mask

Abstract

To provide a laminated nonwoven fabric that can be suitably used as a liquid-impregnated sheet, which has excellent handling properties when impregnated with a liquid. [Solution] A laminated nonwoven fabric in which, when the volume of one bonded joint formed by bonding fibers together is V1 and the volume of the fibers contained in said bonded joint is V2, surface layers containing short fibers with a fiber length of 200 mm or less are arranged on both surface sides of a spunbonded nonwoven fabric in which V1 / V2 is 1.5 or more, and the spunbonded nonwoven fabric and the surface layers are integrated by the entanglement of the fibers.

Description

[Technical Field]

[0001] The present disclosure relates to a laminated nonwoven fabric and a method for producing the same, a liquid-impregnated sheet for use by being impregnated with a liquid, particularly a cosmetic, and a liquid-impregnated sheet and a face mask obtained by impregnating the same with a liquid. [Background technology]

[0002] Various liquid-impregnated sheets used to remove or apply specific substances to human skin have been proposed and put to practical use. In particular, in the beauty and cosmetics fields, there is growing demand for liquid-impregnated skin dressing sheets (such as face masks that are applied to the face and exfoliating sheets that are applied to the heels, elbows, knees, etc.) that are impregnated with liquids containing active ingredients (e.g., cosmetics). As the substrate for liquid-impregnated skin dressing sheets, nonwoven fabrics primarily made of hydrophilic fibers such as rayon are commonly used.

[0003] As a sheet impregnated with a cosmetic preparation, a sheet configured by combining hydrophilic and hydrophobic fibers has been proposed. For example, Patent Document 1 proposes a cosmetic preparation-impregnated sheet obtained by impregnating a cosmetic preparation into a fiber structure having at least a three-layer structure composed of an inner layer made of a fiber aggregate mainly composed of hydrophobic fibers and upper and lower outer layers made of fiber aggregates mainly composed of hydrophilic fibers. Patent Document 2 proposes a substrate for cosmetic preparation impregnation, which has an inner layer containing a predetermined amount of heat-bondable synthetic fibers and having a basis weight within a predetermined range, and surface layers containing a predetermined amount or more of water-absorbent fibers laminated on both surfaces of the inner layer, the inner layer and the surface layers being hydroentangled and thermally bonded with the heat-bondable synthetic fibers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-93152 [Patent Document 2] Patent No. 4549056 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present disclosure is to provide a laminated nonwoven fabric that can be suitably used as a liquid-impregnated sheet, which has excellent handleability when impregnated with a liquid. [Means for solving the problem]

[0006] The present disclosure provides a laminated nonwoven fabric comprising a spunbonded nonwoven fabric and surface layers each containing short fibers having a fiber length of 200 mm or less, the surface layers being disposed on both surface sides of the spunbonded nonwoven fabric, the spunbond nonwoven fabric and the surface layer are integrated by entanglement of fibers, In the spunbonded nonwoven fabric, when the volume of one bonded portion formed by bonding fibers together is V1 and the volume of the fibers contained in the bonded portion is V2, V1 / V2 is 1.5 or more. Laminated nonwoven fabric to provide.

[0007] The present disclosure also provides a method for producing a laminated nonwoven fabric, comprising: preparing a laminated fiber web by arranging fiber webs containing staple fibers having a fiber length of 200 mm or less on both sides of a spunbonded nonwoven fabric having a V1 / V2 ratio of 1.5 or greater, where V1 is the volume of one bonded joint formed by bonding fibers together and V2 is the volume of the fibers contained in the bonded joint; and subjecting the laminated web to an entanglement treatment to integrate the spunbonded nonwoven fabric and the staple fiber web by entanglement of the fibers. [Effects of the Invention]

[0008] According to this embodiment, a laminated nonwoven fabric is obtained that is relatively bulky and has a good feel and texture, and is easy to handle when impregnated with a liquid. Therefore, when this laminated nonwoven fabric is used for a liquid-impregnated sheet such as an antiperspirant sheet or a face mask, the liquid-impregnated sheet is relatively unlikely to stretch during removal or unfolding from a folded state, resulting in an easy-to-handle liquid-impregnated sheet. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Background to the present embodiment) Because liquid-impregnated sheets are placed against the skin of the human body, their tactile feel is naturally important. However, because relatively large forces may be applied during use, certain mechanical properties, such as strength, are also required. Specifically, liquid-impregnated sheets are sometimes provided in pop-up containers like tissue paper, or rolled up and stored in a cylindrical container from which sheets can be torn off one by one at a dispensing opening. When using such products, a relatively large force is likely to be applied when removing the sheet, which can cause the removed sheet to stretch, making it difficult to use.

[0010] Furthermore, face masks are generally provided in containers in which a liquid-impregnated sheet is folded multiple times and placed individually or in groups. Therefore, when using the face mask, the folded face mask must be unfolded. If the face mask stretches during this process, the openings and cuts corresponding to the eyes, mouth, nose, etc. may shift position, making it difficult to adhere the face mask to the face as intended.

[0011] Liquid-impregnated sheets are often made primarily of hydrophilic or water-absorbent fibers such as rayon to ensure sufficient liquid impregnation. However, if an attempt is made to obtain a nonwoven fabric with relatively high strength using only these fibers, the fibers must be strongly entangled in the nonwoven fabric, which is made by entangling the fibers with a high-pressure fluid flow, resulting in a hard texture.

[0012] Therefore, as in Patent Documents 1 and 2, a structure has been proposed in which an inner layer containing synthetic fibers is provided as a fiber layer to ensure a certain degree of mechanical strength, and a surface layer of water-absorbent fibers is arranged. This type of laminated structure can increase the mechanical strength of the entire nonwoven fabric to a certain extent. In particular, when the inner layer is a spunbonded nonwoven fabric, the spunbonded nonwoven fabric itself has high strength and is resistant to elongation. Therefore, it was thought that even if the inner layer has a relatively small basis weight, the strength of the entire nonwoven fabric could be significantly improved.

[0013] However, although spunbonded nonwoven fabrics themselves have high strength, when they are integrated with other fiber layers, for example, by high-pressure fluid flow entanglement treatment, the fibers are not sufficiently entangled, and delamination is likely to occur in the laminated nonwoven fabric. Furthermore, in order to prevent delamination, it is necessary to increase the pressure of the fluid flow. As a result, the texture and softness of the resulting laminated nonwoven fabric are impaired, and it is not possible to obtain a fabric suitable for use as a liquid-impregnated sheet.

[0014] As a result of further investigation, the inventors have found that if a spunbonded nonwoven fabric having a lower degree of adhesion between the fibers in the bonded portions is used, and a fiber layer is disposed on the surface of the spunbonded nonwoven fabric, the fibers are well entangled and delamination is unlikely to occur. That is, they have found that if fiber layers containing staple fibers are disposed above and below such a spunbonded nonwoven fabric and a high-pressure fluid flow is applied, the spunbonded nonwoven fabric and the staple fiber layer are entangled to an extent that delamination is unlikely to occur, even if the pressure of the high-pressure fluid flow is relatively low, and a nonwoven fabric having a relatively good overall texture can be obtained. The laminated nonwoven fabric of this embodiment will be described below.

[0015] (spunbond nonwoven fabric) The laminated nonwoven fabric of this embodiment is a laminated nonwoven fabric comprising a spunbonded nonwoven fabric and surface layers containing staple fibers arranged on both surfaces of the spunbonded nonwoven fabric, the spunbonded nonwoven fabric and the surface layers being integrated by entanglement of the fibers, and in the spunbonded nonwoven fabric, where V1 is the volume of one bonded portion formed by bonding fibers together and V2 is the volume of the fibers contained in said bonded portion, the ratio V1 / V2 is 1.5 or more. Here, the spunbonded nonwoven fabric will first be described.

[0016] A spunbond nonwoven fabric is a nonwoven fabric made of long fibers made of synthetic resin, with the fibers integrated at adhesive joints. The adhesive joints are densely packed areas where the fibers are bonded together by the material (resin) that makes up the fibers. In this embodiment, a spunbond nonwoven fabric having a relatively small basis weight and relatively weak adhesion at the adhesive joints, and therefore a relatively low degree of fiber density at the adhesive joints, is preferably used.

[0017] In this embodiment, V1 / V2 is used to indicate the density of fibers in a bonded joint, which is the ratio of the volume V1 of one bonded joint to the volume V2 of the fibers contained in that bonded joint. The volume V1 of the bonded joint is calculated by determining the area and thickness of the bonded joint from an electron microscope photograph and multiplying them together. The volume of the fibers contained in the bonded joint (the volume occupied by the fibers) is calculated from the basis weight, fineness, and fiber diameter of the nonwoven fabric. More specifically, the fiber fineness (dtex: weight (g) per 10,000 m)) and basis weight (1 m 2 Assuming that the fiber contained in the bonded joint is a single fiber, calculate the total length (mm) of the fiber contained in the bonded joint of volume V1 from the weight (g) of the nonwoven fabric per unit area. Multiplying the calculated total length of the fiber by the cross-sectional area calculated from the fiber diameter gives the volume V2 of the fiber contained in the bonded joint of volume V1.

[0018] If V1 / V2=1, there are no voids in the bonded joint, and the fibers fill the bonded joint without any gaps. The larger V1 / V2, the more voids there are between the fibers. The more voids there are, the weaker the bond at the bonded joint. When calculating V1 / V2, select four adhesive joints located near each vertex of an area measuring 20 cm long x 20 cm wide, calculate V1 and V2 for these, and then calculate V1 / V2, and then calculate the average value of the calculated V1 / V2.

[0019] In a spunbonded nonwoven fabric, the larger the V1 / V2 ratio, the weaker the degree of adhesion between the fibers in the bonded portions. This means that the fibers in the non-bonded portions between the bonded portions are more mobile and more likely to become entangled with the fibers in the surface layer. Therefore, in this embodiment, even if the pressure of the high-pressure fluid flow is relatively low and the degree of entanglement between the fibers is reduced, the fibers are adequately entangled, making delamination less likely to occur. Although the strength (e.g., breaking strength) of the spunbonded nonwoven fabric decreases as the V1 / V2 ratio increases, the strength improvement effect of the spunbonded nonwoven fabric cannot be adequately achieved unless the surface layer and the spunbonded nonwoven fabric are integrated. Taking this into consideration, in this embodiment, the value of V1 / V2 is set to 1.5 or greater, prioritizing the prevention of delamination.

[0020] V1 / V2 is preferably 1.8 or more, more preferably 2.1 or more, particularly preferably 2.5 or more, and most preferably 3.0 or more. If the value of V1 / V2 is less than 1.5, the density of the fibers in the bonded joints becomes too high, making delamination more likely to occur. The upper limit of the value of V1 / V2 is, for example, 10.0, particularly 7.0, and more particularly 5.0. If the value of V1 / V2 is too large, the adhesion between the fibers in the bonded joints will be insufficient, and the reinforcing effect of the spunbonded nonwoven fabric may not be obtained.

[0021] Furthermore, the spunbond nonwoven fabric used in this embodiment is preferably one in which, where t1 is the thickness of the bonded portions where fibers are bonded together and t2 is the thickness of the portions other than the bonded portions, t1 / t2 is 0.070 or greater. The strength of the bond at the bonded portions is also reflected in the thickness of the bonded portions, and the thinner the bonded portions, the stronger the bond tends to be.

[0022] More specifically, the spunbond nonwoven fabric used in this embodiment is preferably a spunbond nonwoven fabric in which t1 / t2 is 0.070 or greater, where t1 is the thickness of the bonded portions formed by bonding fibers together, and t2 is the thickness of the portions other than the bonded portions. The t1 / t2 ratio of the spunbond nonwoven fabric is more preferably 0.075 or greater, and most preferably 0.080 or greater. The upper limit of t1 / t2 is less than 1, particularly 0.095, more particularly 0.090, and even more particularly 0.085. When t1 / t2 is 1, there is no substantial difference between the bonded and non-bonded portions. Therefore, when t1 / t2 is 1 or greater, the reinforcing effect of the spunbond nonwoven fabric may not be obtained.

[0023] The long fibers constituting the spunbond nonwoven fabric are made of a resin selected from the group consisting of polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polyolefin resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, ethylene-propylene copolymer, ethylene-vinyl alcohol copolymer, and ethylene-vinyl acetate copolymer; and polyamide resins such as nylon 6, nylon 12, and nylon 66.

[0024] The long fibers of the spunbonded nonwoven fabric are preferably made of a polyester resin such as polyethylene terephthalate. Spunbonded nonwoven fabrics made of polyester resin fibers have slightly higher hydrophilicity than those made of olefin resin fibers, which may make it easier for liquids to be impregnated into the sheet.

[0025] The continuous fibers may be single fibers made of one resin or a mixture of multiple resins, or may be composite fibers made of multiple components. Composite continuous fibers may be, for example, sheath-core composite fibers made of a core component and a sheath component. Furthermore, spunbond nonwoven fabrics may be made of two or more types of continuous fibers.

[0026] The fineness of the long fibers constituting the spunbond nonwoven fabric may be, for example, 0.5 dtex to 7.0 dtex, particularly 1.0 dtex to 4.0 dtex, and more particularly 1.2 dtex to 2.5 dtex.

[0027] The basis weight of spunbond nonwoven fabric is, for example, 5 g / m 2 ~30g / m 2 and in particular 6 g / m 2 ~20g / m 2 and more particularly 7 g / m 2 ~15g / m 2 A spunbond nonwoven fabric having a basis weight within this range is likely to be suitably entangled with the surface layer, and is likely to give a laminated nonwoven fabric that is less susceptible to delamination.

[0028] The spunbond nonwoven fabric may, for example, have a thickness of 0.05 mm to 0.20 mm, particularly 0.08 mm to 0.17 mm, and more particularly 0.10 mm to 0.15 mm.

[0029] The spunbond nonwoven fabric may have a breaking elongation in the MD direction of 1% to 30%, particularly 2% to 20%, more particularly 3% to 15%, and even more particularly 4 to 10%, and may have a breaking elongation in the CD direction of 2% to 50%, particularly 3% to 30%, and more particularly 4% to 20%.

[0030] In this embodiment, a spunbond nonwoven fabric having a stress at 10% elongation in the MD direction of 30 N / 5 cm or less is preferably used. The stress at 10% elongation in the MD direction is more preferably 20 N / 5 cm or less, and even more preferably 15 N / 5 cm or less. The lower limit of the stress at 10% elongation in the MD direction is, for example, 1.0 N / 5 cm, particularly 3.0 N / 5 cm, and more particularly 5.0 N / 5 cm. A spunbond nonwoven fabric having a stress at 10% elongation in the MD direction of 30 N / 5 cm or less may have a V1 / V2 ratio of less than 1.5, and even in this case, the degree of adhesion of the spunbond nonwoven fabric is weak enough to be integrated with the surface layer. In addition, in this embodiment, a spunbond nonwoven fabric having a stress at 10% elongation in the CD direction of 7.0 N / 5 cm or less is preferably used. The stress at 10% elongation in the CD direction is more preferably 4.0 N / 5 cm or less, and even more preferably 2.7 N / 5 cm or less. The lower limit of the stress at 10% elongation in the CD direction is, for example, 0.5 N / 5 cm, particularly 1.0 N / 5 cm, and more particularly 1.5 N / 5 cm.

[0031] The spunbond nonwoven fabric used in this embodiment preferably does not have stretchability in any direction. "Stretchability" here refers to an elongation modulus of 50% or more at 20% elongation, measured in accordance with JIS L 1096:2010 8.15.1. A breaking elongation of less than 20% is considered to be non-stretchable in that direction. If the spunbond nonwoven fabric has stretchability, it may be difficult to process the laminated nonwoven fabric into a liquid-impregnated sheet and a face mask (e.g., when punching to fit the shape of a face).

[0032] (Surface layer) Next, the surface layers disposed on both sides of the spunbond nonwoven fabric will be described. The surface layer contains short fibers with a fiber length of 200 mm or less and is not a spunbond nonwoven fabric. The surface layer preferably contains 50% by mass or more of short fibers. A proportion of short fibers of 50% by mass or more tends to soften the texture of the nonwoven fabric and improve the feel to the touch. The surface layer preferably contains 70% by mass or more of short fibers, more preferably 80% by mass or more, even more preferably 90% by mass or more, and most preferably consists of short fibers alone.

[0033] The short fibers have a fiber length of 200 mm or less. The fiber length of the short fibers may be, for example, 10 mm or more and 100 mm or less, particularly 25 mm or more and 100 mm or less, more particularly 30 mm or more and 70 mm or less, and even more particularly 35 mm or more and 65 mm or less, and is appropriately selected depending on the method for producing the surface layer, etc. The surface layer may contain short fibers of different fiber lengths.

[0034] The fibers constituting the surface layer are not particularly limited and may be arbitrarily selected from natural fibers (excluding cotton) such as pulp, hemp, silk, and wool, regenerated fibers such as viscose rayon, cupra, and solvent-spun cellulose fibers (e.g., lentigned lyocell (registered trademark) and Tencel (registered trademark)), and synthetic fibers.

[0035] The resin constituting the synthetic fiber is arbitrarily selected from polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate and copolymers thereof; polyolefin-based resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer; polyamide-based resins such as nylon 6, nylon 12, and nylon 66; acrylic-based resins; engineering plastics such as polycarbonate, polyacetal, polystyrene, and cyclic polyolefin; and their elastomers.

[0036] The synthetic fibers contained in the surface layer may be monolithic fibers (fibers whose cross section consists of one section) or composite fibers (fibers whose cross section consists of two or more sections). In the case of composite fibers, the composite configuration may be any of a core-sheath type (including concentric and eccentric), a split type, a side-by-side type, and an islands-in-sea type. Furthermore, regardless of whether the synthetic fibers are monolithic or composite, the cross-sectional shape (peripheral shape) of the fibers does not have to be circular; for example, they may have a cross section other than a circle (irregular cross section) such as an ellipse, Y-shape, I-shape, polygon, or star shape. Fibers with a shape that has recesses on the periphery of the cross section, such as a Y-shape, I-shape, polygon, or star shape, tend to retain liquid in the recesses, which may enhance the liquid retention of the surface layer.

[0037] The surface layer preferably contains hydrophilic or water-absorbent fibers, such as cellulose fibers, particularly preferably viscose rayon, cupro, and regenerated fibers such as solvent-spun cellulose fibers (e.g., lentigned lyocell and Tencel), so as to be able to retain a sufficient amount of liquid. The surface layer may contain, for example, 20% by weight or more, particularly 50% by weight or more, more particularly 70% by weight or more, and even more particularly 90% by weight or more of cellulose fibers, or may consist solely of cellulose fibers.

[0038] The fineness of the cellulose fibers contained in the surface layer may be, for example, about 0.1 dtex to 6 dtex, and particularly about 0.3 dtex to 3.5 dtex. Cellulose fibers with a fineness within this range are suitable for ensuring the flexibility of the entire laminated nonwoven fabric. If the fineness of the cellulose fibers is too small, the carding ability during the production of a fiber web may deteriorate, which may reduce the productivity of the nonwoven fabric. If the fineness of the cellulose fibers is too large, the nonwoven fabric may become coarse and have a poor feel.

[0039] Alternatively, the surface layer may contain fibers derived from splittable conjugate fibers. "Fibers derived from splittable conjugate fibers" refers to single fibers formed by splitting splittable conjugate fibers, consisting of only one section before splitting, fibers consisting of two or more sections, as well as fibers in which a single splittable conjugate fiber has been split in part but not split in other parts. Alternatively, to the extent that fibers formed by splitting splittable conjugate fibers are included in the nonwoven fabric, if a single splittable conjugate fiber is not split at all, such a completely unsplit splittable conjugate fiber is also included in the fibers derived from splittable conjugate fibers.

[0040] Specifically, splittable conjugate fibers have a cross-sectional structure in which at least one of the constituent components is divided into two or more parts in the fiber cross section, at least a portion of the constituent components is exposed on the fiber surface, and the exposed parts are formed continuously in the length direction of the fiber. Splittable conjugate fibers may have wedge-shaped sections arranged in a chrysanthemum shape. Alternatively, splittable conjugate fibers may have sections arranged in layers in the fiber cross section. Furthermore, splittable conjugate fibers may be so-called solid splittable conjugate fibers, which do not have continuous cavities in the length direction when the fiber cross section is observed, or so-called hollow splittable conjugate fibers, which have one or more continuous cavities in the length direction.

[0041] Combinations of components (resins) that make up splittable composite fibers include, for example, polyethylene terephthalate / polyethylene, polyethylene terephthalate / ethylene-propylene copolymer, polypropylene / polyethylene, etc. (Polyethylene is any one of high-density polyethylene, low-density polyethylene, and linear low-density polyethylene, or a combination thereof).

[0042] The fineness of the splittable conjugate fiber is not particularly limited as long as it provides ultrafine fibers having a fineness of 0.6 dtex or less, preferably 0.5 dtex or less, when split into its components (i.e., when each section becomes a single fiber). In this embodiment, when ultrafine fibers are contained in the surface layer as fibers derived from the splittable conjugate fiber, the nonwoven fabric becomes flexible, and the fine voids formed between the ultrafine fibers allow the liquid to be well retained.

[0043] To produce such ultrafine fibers, the fineness of the splittable conjugate fiber is preferably 1 dtex or more and 9 dtex or less, more preferably 1.5 dtex or more and 3.5 dtex or less, and even more preferably 1.5 dtex or more and 2.5 dtex or less. Furthermore, the number of divisions into each component in the splittable conjugate fiber (i.e., the number of sections in the conjugate fiber) is, for example, preferably 4 to 32, more preferably 4 to 20, and most preferably 6 to 10. The lower limit of the fineness of the ultrafine fibers is not particularly limited, but is preferably 0.05 dtex or more.

[0044] The surface layer may contain 10% by mass or more of fibers derived from splittable conjugate fibers, particularly 30% by mass or more, and more particularly 50% by mass or more. The upper limit of the content of fibers derived from splittable conjugate fibers is, for example, 90% by mass, particularly 70% by mass. If the proportion of fibers derived from splittable conjugate fibers is too low, the effects of the surface layer containing ultrafine fibers may not be obtained. If the proportion is too high, the nonwoven fabric may become flexible, making it more likely to stretch during cutting, and other processability problems may be reduced. Furthermore, because splittable conjugate fibers are a type of synthetic fiber, if the proportion of fibers derived from them is too high, the nonwoven fabric may have difficulty retaining liquid, making it difficult to impregnate or penetrate a predetermined amount of liquid.

[0045] Alternatively, the surface layer may contain synthetic fibers not derived from splittable composite fibers. Such synthetic fibers include, for example, monofilaments, sheath-core composite fibers, side-by-side composite fibers, and islands-in-the-sea composite fibers. The fineness of such synthetic fibers is not particularly limited, and is, for example, 0.6 dtex to 6 dtex, particularly 0.8 dtex to 4.8 dtex, more particularly 1.2 dtex to 3.5 dtex, and even more particularly 1.5 dtex to 2.5 dtex.

[0046] Alternatively, the surface layer may contain cellulose fibers and synthetic fibers (particularly splittable composite fibers). In this case, the cellulose fibers may be contained in the surface layer in an amount of, for example, 20% to 90% by mass, particularly 30% to 70% by mass, and the synthetic fibers may be contained in the surface layer in an amount of, for example, 10% to 80% by mass, particularly 30% to 70% by mass.

[0047] The surface layer has a weight of, for example, 5 g / m 2 ~50g / m 2 and in particular 10 g / m 2 ~45g / m 2 and more particularly 15 g / m 2 ~40g / m 2 If the basis weight of the surface layer is too small, the texture of the entire laminated nonwoven fabric may be reduced, whereas if the basis weight is too large, the degree of integration with the spunbonded nonwoven fabric will be weakened, and peeling between the layers will tend to occur more easily.

[0048] The surface layers located on both sides of the spunbond nonwoven fabric may be the same or different. For example, the basis weight of one surface layer may be greater than the basis weight of the other surface layer, or the proportion of recycled fibers in one surface layer may be greater than that in the other surface layer. Alternatively, the two surface layers may differ from each other in two or more parameters selected from the basis weight, fiber type, proportion of specific fibers, and fineness.

[0049] [Overall structure of laminated nonwoven fabric] The laminated nonwoven fabric of this embodiment is a laminated nonwoven fabric in which surface layers are disposed on both surfaces of a spunbonded nonwoven fabric, and the spunbonded nonwoven fabric and the surface layers are integrated by entanglement of the fibers. In this laminated nonwoven fabric, the surface layers may be composed of two or more layers. For example, the side closer to the spunbonded nonwoven fabric may be a layer containing only recycled fibers or a higher proportion of recycled fibers, and the side farther away may be a layer containing only fibers derived from splittable conjugate fibers or a higher proportion of such fibers.

[0050] The entanglement of the fibers of the spunbonded nonwoven fabric with the fibers of the surface layer may be achieved, for example, by high-pressure fluid flow treatment or needle punching. If the degree of integration between the spunbonded nonwoven fabric and the surface layer, i.e., the degree of entanglement of the fibers, is too weak, peeling between the surface layer and the spunbonded nonwoven fabric is likely to occur, resulting in poor handleability. On the other hand, if the degree of integration between the spunbonded nonwoven fabric and the surface layer is too strong, peeling is less likely to occur, but the texture becomes hard.

[0051] In this embodiment, by using a spunbond nonwoven fabric having a V1 / V2 ratio of 1.5 or more as described above, a laminated nonwoven fabric can be obtained in which interlayer peeling is unlikely to occur even if the degree of entanglement of the fibers is relatively weak (for example, even if the fluid pressure is reduced during the entanglement treatment using a high-pressure fluid flow). Specifically, the laminated nonwoven fabric of this embodiment has a peel strength in the MD direction between the spunbond nonwoven fabric and the surface layer of, for example, 1.5 N or more, particularly 2.5 N or more, and more particularly 3.0 N or more, and can be provided as one in which the degree of entanglement of the fibers is relatively weak and the fabric has a soft feel.

[0052] The upper limit of the peel strength in the MD direction of the laminated nonwoven fabric of this embodiment is, for example, 20 N. It may be difficult to obtain a laminated nonwoven fabric with a peel strength exceeding 20 N and having a soft texture even when using the above-mentioned specific spunbonded nonwoven fabric. The peel strength in the MD direction of the laminated nonwoven fabric of this embodiment may be, for example, 2.5 N to 15 N, and particularly 3.0 N to 10 N.

[0053] When the surface layer of the laminated nonwoven fabric of this embodiment is made only of cellulose fibers, more preferably when the surface layer is made only of regenerated fibers, the peel strength in the MD direction of the laminated nonwoven fabric is preferably 2.7 N to 10 N, more preferably 3.0 N to 7.0 N. When the surface layer of the laminated nonwoven fabric of this embodiment contains 10% by mass or more of fibers derived from splittable conjugate fibers, the peel strength in the MD direction of the laminated nonwoven fabric is preferably 6.0 N to 20 N, more preferably 6.5 to 11 N.

[0054] The softness of the feel or flexibility of the laminated nonwoven fabric of this embodiment can be indicated, for example, by its bending resistance measured using a handle-ometer. Specifically, the laminated nonwoven fabric of this embodiment may have a bending resistance of 0.30 N to 1.50 N in a dry state, particularly 0.40 N to 1.30 N, and more particularly 0.50 N to 1.20 N. The bending resistance can also vary depending on the basis weight of the sheet. According to this embodiment, by using the above-mentioned specific spunbond nonwoven fabric and appropriately selecting the basis weight and other factors of the laminated nonwoven fabric, a laminated nonwoven fabric having a bending resistance within the above range can be provided.

[0055] The laminated nonwoven fabric of this embodiment may have a bending resistance of 0.40 N to 1.10 N, particularly 0.50 N to 0.95 N, and more particularly 0.60 N to 0.90 N, measured in a wet state in which 100 parts by mass of the laminated nonwoven fabric is impregnated with 500 parts by mass of water. The flexibility of the laminated nonwoven fabric of this embodiment is exhibited even when impregnated with a liquid.

[0056] The basis weight of the laminated nonwoven fabric of this embodiment is appropriately selected depending on the application, etc., and is, for example, 25 g / m 2 ~100g / m 2 and in particular 30 g / m 2 ~90g / m 2 and more particularly 35 g / m 2 ~80g / m 2 When the laminated nonwoven fabric of the present embodiment is used as a face mask, the basis weight may be, for example, 30 g / m 2 ~90g / m 2and in particular 35 g / m 2 ~85g / m 2 and more particularly 40 g / m 2 ~80g / m 2 It may be. If the basis weight is too small, the amount of liquid that can be impregnated may be reduced. If the basis weight of the laminated nonwoven fabric is large, either the basis weight of the spunbonded nonwoven fabric or the basis weight of the surface layer will be large. In the former case, the texture of the entire laminated nonwoven fabric will tend to be hard, and in the latter case, the peel strength will tend to be low. In the laminated nonwoven fabric of this embodiment, the ratio of the basis weight of the laminated nonwoven fabric to the basis weight of the spunbonded nonwoven fabric (basis weight of laminated nonwoven fabric / basis weight of spunbonded nonwoven fabric) is preferably 2.5 or more, more preferably 3.0 or more, even more preferably 4.0 or more, and particularly preferably 5.5 or more. When the lower limit of the basis weight ratio is within the above range, the feel and liquid retention of the surface layer can be easily improved. Furthermore, the ratio of the basis weight of the laminated nonwoven fabric to the basis weight of the spunbonded nonwoven fabric is preferably 10 or less, more preferably 9.0 or less, and even more preferably 8.0 or less. When the upper limit of the basis weight ratio is within the above range, delamination is less likely to occur, making it easier to improve the handleability of the laminated nonwoven fabric.

[0057] The specific volume of the laminated nonwoven fabric of this embodiment is, for example, 10.0 cm 3 / g~13.0cm 3 / g, and in particular 10.5 cm 3 / g~12.5cm 3 / g, more particularly 11.0 cm 3 / g~12.0cm 3 / g. The specific volume can be determined from the basis weight and thickness of the laminated nonwoven fabric, and the thickness of the laminated nonwoven fabric is measured with a load of 294 Pa applied to the sample. In the laminated nonwoven fabric of this embodiment, the degree of entanglement of the fibers is relatively weak, so it tends to have a relatively large specific volume. A laminated nonwoven fabric with a large specific volume tends to provide a soft feel and can hold a relatively large amount of liquid in the voids between the fibers.

[0058] The laminated nonwoven fabric of this embodiment may have, for example, a MD breaking elongation of 30% to 100%, particularly 35% to 80%, and more particularly 40% to 70%, a CD breaking elongation of 30% to 160%, particularly 50% to 140%, and more particularly 70% to 120%, a MD breaking strength of 20 N / 5cm to 180 N / 5cm, particularly 30 N / 5cm to 160 N / 5cm, and more particularly 40 N / 5cm to 150 N / 5cm, and a CD breaking strength of 5 N / 5cm to 60 N / 5cm, particularly 10 N / 5cm to 50 N / 5cm, and more particularly 17 N / 5cm to 40 N / 5cm.

[0059] Furthermore, the laminated nonwoven fabric of this embodiment may have, for example, a stress at 10% elongation in the MD direction of 1 N / 5cm to 50 N / 5cm, particularly 5 N / 5cm to 40 N / 5cm, and more particularly 10 N / 5cm to 30 N / 5cm, and a stress at 10% elongation in the CD direction of 1 N / 5cm to 20 N / 5cm, particularly 2 N / 5cm to 15 N / 5cm, and more particularly 2.5 N / 5cm to 10 N / 5cm.

[0060] The spunbonded nonwoven fabric constituting the laminated nonwoven fabric of this embodiment has a relatively small degree of compression bonding and a relatively low mechanical strength, but when integrated with the surface layer, the short fibers and long fibers are relatively strongly entangled, resulting in a sheet with relatively high mechanical strength.

[0061] [Manufacturing method of laminated nonwoven fabric] The laminated nonwoven fabric of this embodiment can be produced by a production method including arranging fiber webs containing staple fibers (hereinafter referred to as "short fiber webs") that form surface layers on both surfaces of a spunbonded nonwoven fabric to produce a laminated fiber web, and then subjecting this laminated fiber web to an entanglement treatment to integrate the fibers by entanglement. As explained above, the spunbonded nonwoven fabric is one in which, when the volume of one bonded joint formed by bonding fibers is V1 and the volume of the fibers contained in the bonded joint is V2, the ratio V1 / V2 is 1.5 or more. The staple fiber web can be prepared by a known method. The form of the staple fiber web may be any of a parallel web, a cross web, a carded web such as a semi-random web or a random web, an air-laid web, and a wet-laid web. The staple fiber webs arranged on both sides of the spunbond nonwoven fabric may be different from each other. For example, one may be a parallel web and the other a semi-random web.

[0062] The entanglement treatment between fibers is preferably a high-pressure fluid flow entanglement treatment in which a high-pressure fluid flow is sprayed. The high-pressure fluid is, for example, a high-pressure gas such as compressed air, or a high-pressure liquid such as high-pressure water. In the production of nonwoven fabrics, a hydroentanglement treatment using high-pressure water as the high-pressure fluid is often used, and in this embodiment, the hydroentanglement treatment is preferably used from the viewpoint of ease of implementation, etc. Below, a production method in which high-pressure water (hereinafter also simply referred to as "water flow") is used as the high-pressure fluid will be described.

[0063] The hydroentanglement treatment may be carried out, for example, by placing the laminated fiber web on an 80-100 mesh plain weave support and spraying a water stream onto the web. The hydroentanglement treatment may be carried out by spraying water streams at a water pressure of 1 MPa to 15 MPa onto each of the front and back surfaces of the web 1 to 5 times from nozzles having orifices with a hole diameter of 0.05 mm to 0.5 mm, spaced 0.3 mm to 1.5 mm apart. The water pressure is preferably 1 MPa to 10 MPa, more preferably 1 MPa to 7 MPa. The distance between the nozzle and the web may be, for example, 5 mm to 100 mm, particularly 10 mm to 50 mm. The transport speed of the web on the support may be, for example, 2 m / min to 6 m / min.

[0064] The laminated nonwoven fabric obtained by the hydroentanglement treatment is then subjected to a drying treatment, which may be carried out using, for example, a hot air penetration type heat treatment machine (also called an air-through type heat processing machine), a hot air blowing type heat treatment machine, or an infrared type heat treatment machine.

[0065] [Use of laminated nonwoven fabric] The laminated nonwoven fabric of this embodiment may be impregnated with a liquid and used as a liquid-impregnated sheet that is brought into contact with the skin of a human or animal. The liquid and its impregnation amount are appropriately selected depending on the application. The liquid may be impregnated in an amount of, for example, 600 to 2500 parts by mass, particularly 600 to 1500 parts by mass, and more particularly 700 to 1500 parts by mass, per 100 parts by mass of the nonwoven fabric.

[0066] For example, when the liquid-impregnated sheet is used as a wiping sheet for removing dirt from human skin, the sheet may be impregnated with water or an aqueous solution containing a cleansing component in an amount of 100 to 1,000 parts by mass per 100 parts by mass of the nonwoven fabric. More specifically, liquid-impregnated wiping sheets for personal use are available as hand wipes, baby wipes, menstrual wipes, makeup removers, face wash sheets, antiperspirant sheets, and nail removers, for example.

[0067] When the liquid-impregnated sheet is provided as a liquid-impregnated skin covering sheet for personal use, such as a face mask, an exfoliating sheet, a moisturizing sheet, or a slimming sheet, the liquid containing an active ingredient (e.g., a cosmetic) may be impregnated in an amount of 150 to 2500 parts by mass per 100 parts by mass of the nonwoven fabric. Examples of the active ingredient include, but are not limited to, moisturizing ingredients, exfoliating ingredients, cleansing ingredients, antiperspirant ingredients, fragrance ingredients, whitening ingredients, blood circulation promoting ingredients, UV protection ingredients, and slimming ingredients.

[0068] 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.

[0069] The keratin care sheet is a sheet that is impregnated with a liquid (e.g., a cosmetic product) containing keratin softening ingredients and moisturizing ingredients, and thereby promotes moisturizing and softening of the keratin, as well as promoting the removal of excess keratin. Moisture-retaining sheets are sheets used to moisturize or otherwise care for any part of the body (e.g., the neck, the back of the hands, or the area from the neck to the chest (also known as the décolleté)). Moisture-retaining sheets are impregnated with a liquid (e.g., a cosmetic product) containing moisturizing ingredients and other active ingredients. The slimming sheet is used by being attached to the thighs or abdomen, for example.

[0070] Alternatively, the laminated nonwoven fabric of the present embodiment may be used as a liquid-impregnated sheet for use on an object by applying it to the object. For example, the laminated nonwoven fabric of the present embodiment may be impregnated with a liquid containing a detergent to provide a wiping sheet for an object. The wiping sheet for an object may be used to wipe floors, kitchens, toilets, bathtubs, furniture, walls, screen doors, window panes, etc.

[0071] When the laminated nonwoven fabric of this embodiment is used as either a liquid-impregnated sheet, the surface layer and the spunbonded nonwoven fabric are well integrated, so that delamination is unlikely to occur even when force is applied during use, and pilling due to insufficient entanglement of the fibers is unlikely to occur. Furthermore, regardless of which side of the product is placed against the skin during use, the surface layer containing short fibers comes into contact with the skin, providing the user with a soft feel. Furthermore, the laminated nonwoven fabric of this embodiment has a relatively low bending resistance and high drapeability, making it supple and easy to fit to uneven areas, particularly the face. Furthermore, when the surface layer of the laminated nonwoven fabric is a layer containing highly absorbent fibers, particularly recycled fibers, it exhibits high water retention due to the relatively large specific volume resulting from the surface layer not being excessively entangled with the spunbonded nonwoven fabric and the liquid absorbency of the fibers themselves. Therefore, when a liquid-impregnated sheet made of such a laminated nonwoven fabric is used for personal use, the user can feel a sense of liquid volume, that is, the sensation that a generous amount of liquid is constantly being supplied to the skin and the active ingredients are acting on it.

[0072] In the laminated nonwoven fabric of this embodiment, the spunbond nonwoven fabric prevents excessive stretching of the laminated nonwoven fabric, and the surface layer containing short fibers makes the nonwoven fabric relatively bulky. Therefore, a liquid-impregnated sheet using the laminated nonwoven fabric of this embodiment is easy to handle. For example, even if force is applied to a liquid-impregnated sheet that has been folded and stored in a pop-up container when it is removed from the container, the sheet is unlikely to stretch excessively. Furthermore, when the laminated nonwoven fabric of this embodiment is used as a face mask, it is easy to unfold from its folded state and is unlikely to stretch. [Example]

[0073] The present embodiment will be described below with reference to examples. The spunbond nonwoven fabrics used in this example were those shown in Table 1. In Table 1, PET, which represents the material, is an abbreviation for polyethylene terephthalate, and PP is an abbreviation for polypropylene. The mechanical properties were measured as described below. t1 and t2 were determined by observing a cross section of the spunbond nonwoven fabric cut perpendicular to the thickness direction with an electron microscope (150 to 300 magnifications) without applying a load.

[0074] [Table 1]

[0075] In this example, the following fibers were prepared as the fibers constituting the surface layer. Regenerated fiber 1: Solvent-spun cellulose fiber with a fineness of 1.7 dtex and a fiber length of 38 mm (trade name Lyocell (registered trademark), manufactured by Lenzing) Regenerated fiber 2: Viscose rayon with a fineness of 1.7 dtex and a fiber length of 40 mm (product name Corona, manufactured by Daiwabo Rayon Co., Ltd.) Splittable composite fiber 1: Splittable composite fiber consisting of a combination of polyethylene terephthalate / high-density polyethylene with a fineness of 2.2 dtex and a fiber length of 51 mm, with 8 segments (the smallest fiber formed by splitting has a fineness of 0.275 dtex) (trade name DFS(SH), manufactured by Daiwabo Polytec Co., Ltd.)

[0076] (Examples 1 to 4, Comparative Examples 1 and 2) A staple fiber web containing 100% by mass of Recycled Fiber 1 was prepared using a parallel carding machine to have the basis weight shown in Table 2. Two staple fiber webs were prepared. A staple fiber web was laminated on both sides of the spunbond nonwoven fabric shown in Table 2 to obtain a laminated fiber web. This was placed on a 90-mesh plain-weave support and transported at a speed of 4 m / min. A water stream with the water pressure shown in Table 2 was sprayed once from one surface ("front" in Table 2), followed by a water stream with the water pressure shown in Table 2 sprayed once from the other surface ("back" in Table 2). The nozzle used in the hydroentanglement treatment was a nozzle with 0.1 mm orifices spaced 0.6 mm apart, and the distance between the nozzle and the laminated fiber web during treatment was 20 mm. The laminated fiber web after hydroentanglement treatment was then dried using a hot air penetration heat treatment machine set at 80 ° C to obtain a nonwoven fabric.

[0077] (Examples 5 to 6, Comparative Examples 3 to 5) A nonwoven fabric was obtained in the same manner as in Example 1, except that a short fiber web containing 40% by mass of recycled fiber 2 and 60% by mass of splittable conjugate fiber 1 was produced using a parallel carding machine to have the basis weight shown in Table 2.

[0078] The evaluation results of each example and each comparative example are shown in Tables 2 and 3.

[0079] [Table 2]

[0080] [Table 3]

[0081] The physical properties in the table were measured by the following methods.

[0082] Thickness The thickness of the nonwoven fabric was measured using a thickness measuring device (trade name: THICKNESS GAUGE Model CR-60A, manufactured by Daiei Scientific Instruments Manufacturing Co., Ltd.) under a load of 294 Pa. The specific volume was calculated from the basis weight and thickness of the nonwoven fabric.

[0083] [Bending resistance] The bending resistance of the nonwoven fabric was measured in accordance with JIS L 1096:2010 8.21.5 E method (handle-o-meter method). Specifically, the measurement was performed according to the following procedure. A test piece measuring 20 cm in length and 20 cm in width is placed on the sample table so that the measurement direction of the test piece is perpendicular to the slot (gap width 10 mm). Next, the blade of the penetrator, adjusted so that it is 8 mm below the surface of the specimen stage, is lowered, and when the test specimen is pressed into it, the resistance to the pressing is read at a position 6.7 cm (1 / 3 of the width of the test specimen) from one of the sides, at different points on the front and back in both the vertical and horizontal directions. The maximum value (N) indicated by the microammeter is read as the resistance value. The total of the maximum values ​​for the four sides is calculated, and the average of the three measurements is taken to determine the bending resistance of the sample. The wet bending resistance was measured by impregnating 100 parts by mass of nonwoven fabric with 500 parts by mass of distilled water and placing a polyethylene sheet (23 cm long, 23 cm wide, 0.06 mm thick) under the nonwoven fabric. The wet bending resistance was determined by subtracting the measured value of the polyethylene sheet alone from the measured value.

[0084] [Water retention rate] The nonwoven fabric was cut into a 100mm x 100mm piece in the MD x CD direction, the mass of the nonwoven fabric was measured, and then it was immersed in distilled water for 2 minutes. The nonwoven fabric soaked in distilled water was then hung with clothespins at three corners, and the mass was measured after 10 minutes, and the water retention was calculated according to the following formula. Water retention rate (%)=[(M2-M1) / M1]×100 M1: Mass of the nonwoven fabric before impregnation with distilled water (g) M2: Mass (g) of the nonwoven fabric after soaking in distilled water and hanging for 10 minutes

[0085] [Breaking strength, breaking elongation, stress at 10% elongation] According to JIS L 1096:2010 8.14.1 A method (strip method), a constant-speed tension tensile tester was used to measure the load at break (breaking strength), elongation at break, and stress at 10% elongation under the conditions of a sample width of 5 cm, a grip spacing of 10 cm, and a tensile speed of 30±2 cm / min. The tensile test was performed in the machine direction (MD) and the cross direction (CD) of the nonwoven fabric. The evaluation results are all shown as the average of the values ​​measured for three samples. The wet breaking strength and the like were measured in a state where 100 parts by mass of the nonwoven fabric was impregnated with 500 parts by mass of distilled water.

[0086] [Peeling strength] A 15 cm long (MD dimension) and 5 cm wide (CD dimension) specimen was prepared, and tape (Tesa No. 4267 75 mm x 50 m) was applied to both surfaces of the specimen. After application, any excess tape was cut off. One surface layer (first surface layer) was peeled off from the intermediate layer by 7.5 cm in the longitudinal direction. The peeled first surface layer was clamped by 2.5 cm in the chuck of a constant-speed tension tensile tester. The remaining laminate of the intermediate layer and surface layer (second surface layer) was also clamped by 2.5 cm in the chuck of the tester, with a gripping distance of 10 cm. The tensile test was performed at a speed of 30 ± 2 cm / min to measure the peel strength between the first surface layer and the spunbond nonwoven fabric, and the maximum value was recorded as the peel strength.

[0087] Comparing Example 1 and Comparative Example 2, Example 1 showed higher peel strength. In both Example 1 and Comparative Example 2, the spunbond used was 10 g / m 2However, the V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 2 was small, at 1.4, and the long fibers were more firmly bonded at the bonded portions. Therefore, in Comparative Example 2, the degree of entanglement of the fibers between the surface layer and the spunbonded nonwoven fabric was smaller than in Example 1, and it is thought that the peel strength was smaller. Furthermore, the bending resistance of Example 1 was smaller than that of Comparative Example 2. This is thought to be due to the fact that the V1 / V2 of the spunbonded nonwoven fabric used in Comparative Example 2 was smaller, the fibers were more firmly bonded at the bonded portions, and the spunbonded nonwoven fabric itself was harder. The same is true for the peel strength and bending resistance of Example 2 and Comparative Example 1.

[0088] Comparing the peel strengths of Examples 1 to 3, the peel strength tends to increase as the basis weight of the spunbond nonwoven fabric increases, and the peel strength is 2 The peel strength of Example 3, which uses a spunbond nonwoven fabric with a basis weight of 20 g / m, is particularly high. This is thought to be because the larger the basis weight, the greater the apparent number of fibers per unit area of ​​the nonwoven fabric, increasing the opportunity for entanglement with the fibers of the surface layer. 2 Example 3, which used the spunbonded nonwoven fabric, had a slightly harder feel than Examples 1 and 2, and actually had a higher stiffness, especially when wet. The peel strength of Example 4 is smaller than that of Example 1. The V1 / V2 of the spunbonded nonwoven fabric used in Example 4 is about half that of the spunbonded nonwoven fabric used in Example 1, and it is thought that the degree of entanglement of the fibers between the layers in Example 4 is smaller than that in Example 1 because the bonded parts are more strongly bonded.

[0089] Examples 5 and 6, which contained fibers derived from splittable conjugate fibers in the surface layer, exhibited smaller bending resistance and higher peel strength than Examples 1 to 4. This is thought to be because the ultrafine fibers formed by splitting the splittable conjugate fibers made the entire nonwoven fabric soft, and the ultrafine fibers were well entangled with each other and with the long fibers.

[0090] Comparing Example 5 with Comparative Example 4, Example 5 exhibited higher peel strength, but there was not much difference in bending resistance. The reason why Example 5 exhibited higher peel strength is as explained in relation to the comparison between Example 1 and Comparative Example 2. The reason why there was no significant difference in bending resistance is not clear, but it is thought that the effect of the ultrafine fibers on improving the softness of the nonwoven fabric exceeded the effect of the degree of adhesion of the spunbonded nonwoven fabric on bending resistance.

[0091] Comparing Example 6 with Comparative Example 5, Example 6 exhibited higher peel strength and lower bending resistance (both dry and wet). These results are thought to be due to the V1 / V2 ratio of the spunbond nonwoven fabric used in Example 6 being higher than that of the spunbond nonwoven fabric used in Comparative Example 5.

[0092] Comparing Example 6 with Comparative Example 3, Example 6 exhibited higher peel strength and lower bending resistance (both dry and wet). Comparing the spunbond nonwoven fabrics used in Example 6 and Comparative Example 3, the fiber diameter and fineness of the constituent fibers were not significantly different, and the one used in Comparative Example 3 had a higher basis weight. Considering this, for the same reasons as described for Examples 1 to 3, Comparative Example 3 should have exhibited a higher peel strength, but in fact Example 6 exhibited a higher peel strength. This is thought to be because, as mentioned above, the V1 / V2 ratio of the spunbond nonwoven fabric used in Example 6 was higher than the V1 / V2 of the spunbond nonwoven fabric used in Comparative Example 3.

[0093] The present embodiment includes the following aspects. (Aspect 1) A laminated nonwoven fabric comprising a spunbonded nonwoven fabric and surface layers each containing short fibers having a fiber length of 200 mm or less, the surface layers being disposed on both surface sides of the spunbonded nonwoven fabric, the spunbond nonwoven fabric and the surface layer are integrated by entanglement of fibers, In the spunbonded nonwoven fabric, when the volume of one bonded portion formed by bonding fibers together is V1 and the volume of the fibers contained in the bonded portion is V2, V1 / V2 is 1.5 or more. Laminated nonwoven fabric. (Aspect 2) 2. The laminated nonwoven fabric of aspect 1, wherein the surface layer contains 20% by mass or more of cellulose fibers. (Aspect 3) 3. The laminated nonwoven fabric of aspect 1 or 2, wherein the surface layer comprises fibers derived from splittable conjugate fibers. (Aspect 4) The spunbond nonwoven fabric has a density of 5 g / m 2 ~30g / m 2 The laminated nonwoven fabric of any one of Aspects 1 to 3, having a basis weight of (Aspect 5) A liquid-impregnated sheet comprising the laminated nonwoven fabric of any one of embodiments 1 to 4. (Aspect 6) A liquid-impregnated sheet obtained by impregnating the liquid-impregnated sheet of embodiment 5 with a liquid. (Aspect 7) A face mask obtained by impregnating the liquid-impregnated sheet of embodiment 5 with a liquid. (Aspect 8) A method for producing a laminated nonwoven fabric, comprising: preparing a laminated fiber web by arranging fiber webs containing staple fibers having a fiber length of 200 mm or less on both surfaces of a spunbonded nonwoven fabric, the ratio of V1 / V2 being 1.5 or more, where V1 is the volume of one bonded joint formed by bonding fibers together and V2 is the volume of the fibers contained in said bonded joint; and subjecting the laminated web to an entanglement treatment to integrate the spunbonded nonwoven fabric and the staple fiber web by entanglement of the fibers. [Industrial Applicability]

[0094] The laminated nonwoven fabric of this embodiment can be used for face masks as well as various liquid-impregnated sheets such as cleansing sheets and antiperspirant sheets.

Claims

1. A laminated nonwoven fabric comprising a spunbonded nonwoven fabric and surface layers each containing short fibers having a fiber length of 200 mm or less, the surface layers being disposed on both surface sides of the spunbonded nonwoven fabric, the spunbond nonwoven fabric and the surface layer are integrated by entanglement of fibers, In the spunbonded nonwoven fabric, when the volume of one bonded portion, which is determined by multiplying the area of ​​one bonded portion, which is determined by observing the bonded portion formed by bonding fibers together under an electron microscope, by the thickness of the bonded portion, is defined as V1, and the volume of the fibers contained in the volume V1 of one bonded portion, which is determined from the basis weight of the spunbonded nonwoven fabric and the fineness of the fibers constituting the spunbonded nonwoven fabric, is defined as V2, V1 / V2 is 1.5 or more. Laminated nonwoven fabric.

2. The laminated nonwoven fabric according to claim 1 , wherein the surface layer contains 20% by mass or more of cellulose fibers.

3. The laminated nonwoven fabric according to claim 1 or 2, wherein the surface layer comprises fibers derived from splittable conjugate fibers.

4. The spunbond nonwoven fabric has a density of 5 g / m ２ ~30g / m ２ The laminated nonwoven fabric according to any one of claims 1 to 3, having a basis weight of

5. A liquid-impregnated sheet comprising the laminated nonwoven fabric according to any one of claims 1 to 4.

6. A liquid-impregnated sheet obtained by impregnating the liquid-impregnated sheet according to claim 5 with a liquid.

7. A face mask obtained by impregnating the liquid-impregnated sheet according to claim 5 with a liquid.

8. 2. The laminated nonwoven fabric according to claim 1, wherein the spunbonded nonwoven fabric has a thickness of t1 / t2 of 0.070 or more, where t1 is the thickness of the bonded portion where fibers are bonded together, and t2 is the thickness of the portion other than the bonded portion.

9. 2. The laminated nonwoven fabric according to claim 1, wherein the spunbond nonwoven fabric has a thickness of 0.05 to 0.2 mm, a breaking elongation in the MD direction of 1 to 30%, and a breaking elongation in the CD direction of 3% to 30%.

Images