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

Abstract

To provide a laminated non-woven fabric for a liquid impregnated skin cover sheet in which adhesion to skin is equal in both surfaces and good tactile sensation is provided.SOLUTION: A laminated non-woven fabric for a liquid impregnated skin cover sheet is formed by laminating and integrating a first fiber layer, a second fiber layer, and an intermediate fiber layer positioned between the first fiber layer and the second fiber layer. The laminated non-woven fabric for the liquid impregnated skin cover sheet is provided as follows: the first fiber layer contains water-repellent cellulose fibers of 10 mass% or more and 90 mass% or less, and contains hydrophilic cellulose fibers of 10 mass% or more and 90 mass% or less; the second fiber layer contains hydrophilic fibers of 50 mass% or more; the intermediate fiber layer contains the hydrophilic cellulose fiber where the fiber length is less than 10 mm of 70 mass% or more; and the first fiber layer, the intermediate fiber layer and the second fiber layer are integrated by entanglement of the fibers.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a laminated nonwoven fabric that serves as the substrate for a liquid-impregnated skin application sheet that is impregnated with a liquid, particularly a cosmetic, a method for producing the same, and a liquid-impregnated skin application sheet and a face mask that use the nonwoven fabric. [Background technology]

[0002] Various liquid-impregnated sheets have been proposed and put into practical use to cover the skin of humans or animals and deliver a predetermined substance to the skin. Specific examples include liquid-impregnated skin application sheets (such as face masks and exfoliating sheets for use on heels, elbows, knees, etc.) impregnated with a liquid containing an active ingredient (e.g., a cosmetic). Nonwoven fabrics are generally used as the substrate for liquid-impregnated skin application sheets. Because liquid-impregnated skin application sheets are often used in close contact with the skin for a relatively long period of time, various nonwoven fabrics have been proposed as the substrate in terms of adhesion, liquid release, tactile feel, convenience, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4592516 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-98464 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide a liquid-impregnated skin application sheet that adheres to the skin to the same degree regardless of which surface is used as the skin-contact surface when impregnated with a liquid, and that provides little difference in feel when used due to differences in the nonwoven fabric surface. [Means for solving the problem]

[0005] The present disclosure provides a laminated nonwoven fabric for a liquid-impregnated skin application sheet, which is formed by laminating and integrating a first fiber layer forming one surface, a second fiber layer forming the other surface, and an intermediate fiber layer located between the first fiber layer and the second fiber layer. the first fiber layer contains, based on the total mass of the first fiber layer, 10% by mass or more and 90% by mass or less of water-repellent cellulose fibers and 10% by mass or more and 90% by mass or less of hydrophilic cellulose fibers; the second fiber layer contains hydrophilic fibers in an amount of 50% by mass or more based on the total mass of the second fiber layer; the intermediate fiber layer contains 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the intermediate fiber layer; the first fiber layer, the intermediate fiber layer, and the second fiber layer are integrated by entanglement of the fibers; Provided is a laminated nonwoven fabric for a liquid-impregnated skin covering sheet.

[0006] The present disclosure also provides a method for producing a first fiber web, the first fiber web comprising 10% by mass or more and 90% by mass or less of water-repellent cellulose fibers and 10% by mass or more and 90% by mass or less of hydrophilic cellulose fibers, based on the total mass of the first fiber web; preparing a second fiber web containing hydrophilic fibers in an amount of 50% by mass or more based on the total mass of the second fiber web; preparing a third fiber web containing 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the third fiber web; overlapping the first fiber web, the second fiber web, and the third fiber web so that the third fiber web is positioned between the first fiber web and the second fiber web to prepare a laminated fiber web; subjecting the laminated fiber web to an entanglement treatment using a high-pressure fluid stream to entangle the fibers. The present invention provides a method for producing a laminated nonwoven fabric for a liquid-impregnated skin covering sheet, comprising the steps of: [Effects of the Invention]

[0007] The laminated nonwoven fabric for a liquid-impregnated skin application sheet of the present disclosure has a configuration in which a first fiber layer constituting one surface of the nonwoven fabric contains a predetermined proportion of water-repellent cellulose fibers, a second fiber layer constituting the other surface contains a predetermined proportion of hydrophilic fibers, and an intermediate fiber layer containing a predetermined proportion of hydrophilic cellulose fibers with a fiber length of less than 10 mm is positioned between the two fiber layers, and this configuration ensures equal adhesion on both surfaces when impregnated with liquid. Therefore, the laminated nonwoven fabric for a liquid-impregnated skin application sheet of the present disclosure can provide a highly convenient liquid-impregnated skin application sheet that can be used regardless of the front and back sides. DETAILED DESCRIPTION OF THE INVENTION

[0008] (Background to the present embodiment) As mentioned above, various fibers and configurations have been proposed as the substrate for liquid-impregnated skin application sheets (hereinafter simply referred to as "sheets"). For example, Patent Document 1 proposes a sheet in which an upper fiber layer and a lower fiber layer each containing more than 90% by mass of fibers with a fineness of more than 0.5 dtex are sandwiched between a cellulosic staple fiber layer containing 50% by mass or more of cellulosic staple fibers, and the three fiber layers are integrated by entanglement of the fibers. This document particularly proposes using cotton as the fiber with a fineness of more than 0.5 dtex that accounts for more than 90% of each of the upper and lower fiber layers.

[0009] The sheet described in Patent Document 2 includes a first fiber layer containing 50% by mass or more of hydrophilic fibers and a second fiber layer containing 50% by mass or more of hydrophobic fibers that are more hydrophobic than the hydrophilic fibers contained in the first fiber layer, the hydrophobic fiber layer having a fineness of 1.2 dtex or more and containing two or more types of fibers with different hydrophobicities as the hydrophobic fibers, and the first fiber layer is used by contacting the skin. The sheet described in Patent Document 2 allows the impregnated liquid to easily remain on the skin, thereby enhancing the adhesion and moisturizing effects of the liquid.

[0010] The sheet of Patent Document 1 allows the surface of the fiber layer containing a large amount of cotton to be in contact with the skin, while the intermediate cellulose short fiber layer ensures good texture, making it less likely to lift during wear and providing a good appearance. Furthermore, the sheet of Patent Document 1 can be easily attached to the skin with little force, making it easy to use. The sheet of Patent Document 2 uses hydrophilic fibers to form the surface that comes into contact with the skin, and utilizes the characteristics of each fiber to achieve low irritation or good adhesion.

[0011] One of the requirements for a liquid-impregnated skin dressing sheet is that both sides of the sheet can be used interchangeably. The sheet is usually provided fully wetted and folded, and when used, the user unfolds the sheet and applies it to the desired location, such as the face. This process can be surprisingly tedious, especially when the sheet is wet. If the skin-contacting surface is limited to one side of the sheet, the burden on the user increases. Furthermore, restricting the skin-contacting surface to one side can be undesirable for product providers, as it requires marking or different colors on the front and back of the sheet to allow users to distinguish between the skin-contacting surfaces, complicating the manufacturing process. Thus, the ability to use both sides of the sheet interchangeably is beneficial to both product providers and users.

[0012] One way to make a sheet usable without distinguishing between the two sides is to construct the sheet from a single-layer nonwoven fabric. However, as mentioned above, many nonwoven fabrics with laminated structures have been proposed to meet different requirements for sheets, and in fact, many of the various requirements for sheets can only be met by nonwoven fabrics with laminated structures.

[0013] A sheet made of a laminated nonwoven fabric may have the same appearance on both sides, but the properties on both sides may be significantly different in terms of the comfort it provides to the user. One of the factors that most affects comfort is the sheet's adhesion to the skin, and when the nonwoven fabric is made of different materials on both sides, the adhesion between the front and back surfaces is often quite different. Therefore, it is also common to make the fiber layers forming both sides of a laminated nonwoven fabric (the outermost fiber layers) have the same fiber structure, thereby making the adhesion between both sides of the sheet equal.

[0014] However, sheets in which the two outermost layers have the same fiber composition may be impractical in terms of other properties (e.g., mechanical properties). It has been found that this tendency is particularly pronounced when water-repellent cellulose fibers are used. Water-repellent cellulose fibers have the same level of water repellency as synthetic fibers, but are biodegradable because they are made from natural materials. The inventors believed that sheets using water-repellent cellulose fibers would be highly appealing in today's world, where awareness of environmental issues and preference for natural materials are on the rise, and investigated sheets of various configurations using these fibers.

[0015] Through further investigation, the inventors discovered that water-repellent cellulose fibers are soft and have low strength when wet, and that their inclusion in the fiber layer constituting the skin-contacting surface imparts a pleasant tactile feel to the sheet. To ensure a pleasant tactile feel, it is preferable to increase the proportion of water-repellent cellulose fibers to a certain extent. On the other hand, when producing a nonwoven fabric by entangling fibers with a high-pressure fluid flow (especially a water flow), water-repellent cellulose fibers can have low entanglement properties due to their water repellency, which can result in insufficient strength of the nonwoven fabric. Furthermore, they tend to increase the cost of the sheet, so their use in large quantities is not preferred. Therefore, the inventors investigated a sheet configuration in which one of the two outer layers of the sheet contains a relatively high proportion of water-repellent cellulose fibers, and the other layer contains no water-repellent cellulose fibers, or if it does contain any, it contains only a relatively small proportion.

[0016] However, a problem with such a sheet was found: the fiber structure differs on both sides of the sheet, making it difficult to obtain equivalent adhesion. The inventors conducted various studies to solve this problem. They found that by laminating a first fiber layer containing a larger proportion of water-repellent cellulose fibers and a second fiber layer containing hydrophilic fibers, with an intermediate fiber layer containing a predetermined proportion or more of hydrophilic cellulose fibers with a fiber length of less than 10 mm between them, and entangling the fibers, they were able to obtain a nonwoven fabric that provides a sheet with a pleasant feel and has approximately the same adhesion on both sides, despite the different fiber structures of the first and second fiber layers. This was achieved by finding that adhesion is affected by the amount of liquid in the fiber layer and the liquid film formed on the surface of the fiber layer. They also found that in a fiber layer containing a higher proportion of water-repellent cellulose fibers, although the water-repellent cellulose itself has low liquid retention, the voids between the fibers are less likely to entangle, increasing the number of interfiber voids, which tends to more easily retain liquid. On the other hand, in a fiber layer composed of a higher proportion of hydrophilic fibers other than water-repellent cellulose, the liquid retention of the hydrophilic fibers themselves (and their surroundings) tends to improve, but the voids between the fibers become smaller as the hydrophilic fibers become tightly entangled. By examining the liquid retention properties of the fiber layer achieved when using each fiber and striking a balance between them, it became possible to create a structure in which there is no significant difference in the adhesion between the two surfaces of the laminated nonwoven fabric. The fibers constituting the nonwoven fabric of this embodiment will be first described below.

[0017] (Water-repellent cellulose fiber) Cellulose fibers are inherently hydrophilic, but in this embodiment, cellulose fibers to which water repellency has been artificially imparted are referred to as "water-repellent cellulose fibers" and are used. The type of cellulose fiber is not particularly limited. Cellulose 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) viscose-based rayon and polynosic rayon, cupra obtained by the cuprammonium process, and solvent-spun cellulose fibers such as Tencel® and Lyocell obtained by the solvent-spinning process, 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

[0018] The water-repellent cellulose fibers may be those obtained by adding a water-repellent agent to the cellulose fibers. Alternatively, the water-repellent cellulose fibers may be obtained by mixing a specific compound into a spinning solution to spin regenerated fibers, and then adding a specific water-repellent agent to the regenerated fibers, thereby forming bonds between the specific compound and the water-repellent agent and imparting water-repellency. Water-repellent regenerated cellulose fibers obtained by such a method are disclosed, for example, in JP 2019-65443 A.

[0019] Examples of water-repellent cellulose fibers available on the market include Ecorepellent (trade name, water-repellent viscose rayon) manufactured by Daiwabo Rayon Co., Ltd. and Olea (trade name, water-repellent viscose rayon) manufactured by Kelheim Fibres GmbH. These water-repellent cellulose fibers may be used in the present embodiment. In particular, Ecorepellent (trade name) is preferably used because it exhibits high water repellency and has highly durable water repellency, and its water repellency is not easily reduced even when subjected to, for example, hydroentanglement treatment.

[0020] The fineness of the water-repellent cellulose fibers may be, for example, 0.6 dtex to 3.3 dtex, particularly 1.0 dtex to 2.5 dtex, and more particularly 1.4 dtex to 2.0 dtex. If the fineness of the water-repellent cellulose fibers is too small, the voids in the first fiber layer become small, making it difficult for the nonwoven fabric to retain liquid. If the fineness is too large, the tactile feel of the nonwoven fabric may be reduced. The fineness of the water-repellent cellulose fibers is not limited to these ranges. In particular, when using natural fibers, it is difficult to adjust the fineness, so fibers with finenesses outside the above ranges may be used.

[0021] The fiber length of the water-repellent cellulose fibers is not particularly limited and may be appropriately selected depending on the manufacturing method of the laminated nonwoven fabric, etc. For example, when the first fibrous layer is manufactured by preparing a carded web in the manufacturing of the laminated nonwoven fabric, the water-repellent cellulose fibers may be short fibers. The fiber length of these short fibers may be, for example, 10 mm to 100 mm, particularly 20 mm to 75 mm, and more particularly 30 mm to 65 mm. Alternatively, when the first fibrous layer is manufactured by an air-laying method, the fiber length may be, for example, 2 mm to 20 mm. In this embodiment, a plurality of water-repellent cellulose fibers may be used that differ in one or more of material, fiber length, and fineness.

[0022] In this embodiment, the water repellency of the water-repellent cellulose fibers can be evaluated by the sedimentation velocity (6(1)Ka) measured by the following method, for example, in accordance with the standard for medical gauze and medical absorbent cotton of Yakushokuki-hatsu No. 0630001. Ten grams of fiber aggregates, either fibers before nonwoven fabric production or fibers extracted from textile products, are spread using a carding machine. These fibers are evenly placed in a 3-gram test basket made with 0.4 mm diameter copper wire, 50 mm in diameter, 80 mm deep, and 20 mm apart. The basket is then gently lowered horizontally into 200 mm of water at a temperature of 24-26°C, 12 mm above the water surface. The settling rate is the time it takes for the basket to sink below the surface. For fibers that cannot be spread using a carding machine (e.g., short fibers), 10 grams of fiber can be placed directly in the test basket. Alternatively, if the textile product is in the form of a wet-laid or air-laid nonwoven fabric, a 10-gram piece of nonwoven fabric cut to a 1 cm x 1 cm size can be placed in the test basket.

[0023] When the sedimentation rate is measured by the above method, a sample that absorbs water but does not sink below the water surface after 1 minute, particularly 5 minutes, and more particularly 10 minutes is preferably used as a water-repellent cellulose fiber. A sample that does not sink and remains partially or completely floating on the water surface after 1 minute is even more preferably used as a water-repellent cellulose fiber.

[0024] Water-repellent cellulose fibers exhibit water repellency due to their water-repellent surface treatment and exhibit the above-mentioned sedimentation rate, but once wetted, they retain moisture within the fiber. Therefore, the official moisture regain of water-repellent cellulose fibers (especially water-repellent rayon) is equivalent to that of the same type of cellulose fiber without water-repellent treatment, and their secondary swelling is inferior to that of cellulose fibers without water-repellent treatment, but tends to be higher than that of general synthetic fibers. For example, some viscose rayons without water-repellent treatment have a secondary swelling (water swelling: measured according to JIS L1015:2010 8.26) of approximately 80% to 90%, while some water-repellent rayons have a secondary swelling of approximately 45% to 55%. Furthermore, some water-repellent rayons have an official moisture regain (measured according to JIS L1015) of approximately 10% to 12%, which is equivalent to the official moisture regain (11%) of general rayon without water-repellent treatment.

[0025] (hydrophilic cellulose fiber) In this embodiment, the first fiber layer is constructed by combining water-repellent cellulose fibers and hydrophilic cellulose fibers, and the intermediate fiber layer located between the first fiber layer and the second fiber layer is constructed to contain hydrophilic cellulose fibers with a fiber length of less than 10 mm. The term "hydrophilic cellulose fibers" is used to distinguish them from water-repellent cellulose fibers and refers to cellulose fibers that have not been imparted with water-repellent properties and that have inherent hydrophilicity. Therefore, examples of hydrophilic cellulose fibers are as described above for water-repellent cellulose fibers.

[0026] The hydrophilic cellulose fibers may be regenerated fibers. Regenerated fibers are preferably used because their fineness can be easily adjusted and has little variation. Among regenerated fibers, viscose rayon is particularly preferred because of its cost advantage. In particular, when the hydrophilic cellulose fibers contained in the first fiber layer are viscose rayon, viscose rayon is soft with relatively low fiber strength, and has little variation in fineness and fiber length, allowing for uniform entanglement, which facilitates good adhesion of the first fiber layer to the skin.

[0027] The fineness of the hydrophilic cellulose fibers may be, for example, 0.2 dtex to 6.0 dtex, particularly 0.3 dtex to 4.5 dtex, more particularly 0.4 dtex to 4.0 dtex, and even more particularly 0.6 dtex to 3.0 dtex. If the fineness of the hydrophilic cellulose fibers is too small, fiber clumps (neps) are likely to form in the nonwoven fabric, while if it is too large, the feel of the nonwoven fabric may be reduced. The fineness of the hydrophilic cellulose fibers is not limited to these ranges. In particular, when using natural fibers, fineness adjustment is difficult, so fibers with finenesses outside the above ranges may be used.

[0028] The fiber length of the hydrophilic cellulose fibers contained in the first fiber layer is not particularly limited and may be, for example, 10 mm or more. When the first fiber layer contains a predetermined proportion or more of hydrophilic cellulose fibers, the fibers are ensured to be entangled with each other, thereby ensuring the integrity of the sheet. The specific fiber length of the hydrophilic cellulose fibers contained in the first fiber layer may be selected depending on the manufacturing method of the laminated nonwoven fabric, etc. The relationship between the manufacturing method of the laminated nonwoven fabric (the method of producing the fiber layer) and the fiber length is as explained in relation to the water-repellent cellulose fibers.

[0029] The first fibrous layer may contain a plurality of hydrophilic cellulose fibers that are different in one or more of material, fiber length, and fineness.

[0030] The hydrophilic cellulose fibers contained in the intermediate fiber layer have a fiber length of less than 10 mm. By including a certain proportion or more of short hydrophilic cellulose fibers in the intermediate fiber layer, the surface properties of the first fiber layer and the second fiber layer, particularly their adhesion when impregnated with liquid, can be made equivalent. Examples of hydrophilic cellulose fibers with a fiber length of less than 10 mm include pulp such as mechanical pulp, recycled pulp, and chemical pulp, as well as regenerated fibers, melt-spun cellulose fibers, and semi-synthetic fibers, which are relatively easy to cut to the desired fiber length during the manufacturing process.

[0031] In this embodiment, pulp is preferably used as the hydrophilic cellulose fiber contained in the intermediate fiber layer. The pulp may be produced by a conventional method using softwood or hardwood. Generally, the fineness of pulp fibers is about 1.0 dtex to 4.0 dtex, and the fiber length is about 0.8 mm to 4.5 mm. Pulp has a proven track record of use as a material for sanitary products, making it popular with consumers. Furthermore, its biodegradability makes it a preferred material for disposable sheets. Furthermore, when nonwoven fabrics are produced using the hydroentangling method described below, wood-based pulp is likely to entangle with the hydrophilic cellulose fibers contained in the first fiber layer and the hydrophilic fibers contained in the second fiber layer. Therefore, by adjusting the fiber composition of the first and second fiber layers, the degree of entanglement between the intermediate fiber layer and the first and second fiber layers can be adjusted, thereby facilitating the adjustment of the surface properties of these fiber layers.

[0032] The hydrophilic cellulose fibers may be such that, when the sedimentation rate is measured by the method described in the section on the evaluation method for water repellency of water-repellent cellulose fibers, the sample sinks below the water surface within 60 seconds. The hydrophilic cellulose fibers may be such that, after a sample is dropped onto the surface of water in a beaker, the sample absorbs water and sinks below the water surface within, for example, 50 seconds, particularly 45 seconds, and more particularly 30 seconds.

[0033] (hydrophilic fiber) The hydrophilic fibers are contained in the second fiber layer to form the second fiber layer. Specific examples of hydrophilic fibers include the hydrophilic cellulose fibers described above, as well as natural fibers other than cellulose fibers (e.g., silk and wool), hydrophilic synthetic fibers, and hydrophobic synthetic fibers (synthetic fibers with an official moisture regain of less than 5%) that have been subjected to a hydrophilization treatment. Examples of hydrophilization treatments include corona discharge treatment, sulfonation treatment, graft polymerization treatment, kneading a hydrophilizing agent into fibers, and applying a durable oil.

[0034] The hydrophilic fibers may be the hydrophilic cellulose fibers described above. In this case, the hydrophilic fibers contained in the second fibrous layer and the hydrophilic cellulose fibers contained in the first fibrous layer may be the same. If the hydrophilic cellulose fibers contained in the first fibrous layer and the second fibrous layer are the same, differences in not only the adhesion between the two surfaces of the nonwoven fabric but also the tactile feel are reduced, and the difference in wearing comfort between the two surfaces can be further reduced. For example, the hydrophilic cellulose fibers contained in both fibrous layers may be viscose rayon.

[0035] Alternatively, in this embodiment, the hydrophilic fibers contained in the second fiber layer may be different from the hydrophilic cellulose fibers contained in the first fiber layer. Here, the difference between hydrophilic fibers and hydrophilic cellulose fibers refers to the difference in the materials that make up the fibers, such as the difference in the classification in the "Type of Fiber, etc." column in the "Terminology Indicating the Names of Fibers" published by the Consumer Affairs Agency (https: / / www.caa.go.jp / policies / policy / representation / household_goods / guide / fiber / fiber_term.html).

[0036] For example, if the first fiber layer contains viscose rayon as the hydrophilic cellulose fiber, the second fiber layer may contain cotton as the hydrophilic fiber. Or vice versa. Viscose rayon and cotton are both hydrophilic cellulose fibers, but they are made from different materials. When the hydrophilic cellulose fibers in the first fiber layer and the hydrophilic fibers in the second fiber layer are different, the characteristics of each fiber can be utilized in the nonwoven fabric, potentially improving sheet properties (e.g., mechanical properties or tactile feel). Other examples of combinations of hydrophilic cellulose fibers in the first fiber layer and hydrophilic fibers in the second fiber layer include solvent-spun cellulose fiber / viscose rayon and solvent-spun cellulose fiber / cotton. In these combinations, the fiber layers containing each fiber are not particularly limited; if one fiber is contained in the second fiber layer, the other fiber will be contained in the first fiber layer, and vice versa.

[0037] In one embodiment of the present invention, some or all of the hydrophilic fibers contained in the second fiber layer are preferably cotton. Cotton has a long history of use as a natural material and is widely used in clothing and sanitary materials. It is gentle on the skin, has a pleasant feel, and is recognized by consumers as safe. Therefore, the use of cotton can further enhance the appeal of the sheet. In addition, cotton has relatively high fiber strength, making it easy to improve the physical properties of nonwoven fabrics. Furthermore, cotton has nonuniform fineness and fiber length, including some with relatively thick fineness and short fiber length, making it easy to entangle with the short-fiber hydrophilic cellulose fibers of the intermediate fiber layer. This makes it easy to ensure entanglement with the intermediate fiber layer. Furthermore, cotton has a relatively low water retention capacity, which, combined with its high tendency to be entangled by water flow and the resulting reduction in interfiber voids within the fiber layer, tends to reduce the water absorption or water retention capacity of the second fiber layer. This reduces the difference in water retention capacity between the second fiber layer and the first fiber layer, which uses water-repellent cellulose fibers. For these reasons, in this embodiment, even if the water-repellent cellulose fiber is viscose rayon, a material different from cotton, it is believed that there will be little difference in adhesion to the skin between the first fiber layer and the second fiber layer.

[0038] When using cotton, any cotton commonly used in the manufacture of nonwoven fabrics can be used. Specifically, for example, cotton having a fineness of 0.5 dtex to 3.5 dtex and a fiber length (average fiber length) of 20 mm to 60 mm can be used. Multiple cottons with different fiber lengths and types can be used.

[0039] In another example of this embodiment, some or all of the hydrophilic fibers contained in the second fiber layer are preferably recycled fibers. Recycled fibers are preferred because their fineness is easily adjusted, has little variation, and provides the entire laminated nonwoven fabric with flexibility. Among recycled fibers, viscose rayon is particularly preferred because of its cost advantage, low wet strength (especially compared to solvent-spun cellulose fibers), softness, and high water retention. Furthermore, when the hydrophilic fiber of the second fiber layer is viscose rayon, its tendency to entangle with the intermediate layer due to water flow tends to be smaller than, for example, cotton. Therefore, the increase in rigidity of the nonwoven fabric due to tight entanglement of fibers is suppressed, resulting in a soft laminated nonwoven fabric. When viscose rayon is used, the fiber itself has high liquid retention, so even if the fibers in the second fiber layer are tightly entangled and the inter-fiber voids are small, the overall liquid retention properties can be maintained at the same level as the first fiber layer.

[0040] When using hydrophilic fibers other than natural fibers such as cotton, whose fineness can be adjusted, the fineness may be the same as that of the hydrophilic cellulose fibers contained in the first fibrous layer, or the difference therebetween may be 2.0 dtex or less in absolute value. This may result in more similar surface adhesion, texture, and feel between the two fibrous layers, thereby minimizing the difference in feel when worn on both sides of the sheet. Alternatively, the fineness of the hydrophilic fibers contained in the second fibrous layer may be smaller than that of the hydrophilic cellulose fibers contained in the first fibrous layer by, for example, 1.0 dtex or more, thereby making the surface of the second fibrous layer denser and smoother.

[0041] When the hydrophilic fiber is particularly a recycled fiber, the recycled fiber may have a fineness of, for example, 0.2 dtex to 6.0 dtex, particularly 0.3 dtex to 5.5 dtex, more particularly 0.4 dtex to 4.5 dtex, and even more particularly 0.6 dtex to 3.0 dtex. If the recycled fiber fineness is too small, fiber clumps (neps) are likely to occur in the nonwoven fabric, while if it is too large, the feel of the nonwoven fabric may be reduced.

[0042] In this embodiment, the fiber length of the hydrophilic fibers contained in the second fiber layer is not particularly limited and may be, for example, 10 mm or more. When a nonwoven fabric is produced by a hydroentangling method as described below, the strength of the nonwoven fabric can be ensured by increasing the fiber length of the hydrophilic fibers that exhibit good hydroentangling properties to a certain extent (for example, 10 mm or more). The fiber length of the hydrophilic fibers may be appropriately selected depending on the manufacturing method of the laminated nonwoven fabric, etc. The relationship between the manufacturing method of the laminated nonwoven fabric (the method of producing the fiber layer) and the fiber length is as described in connection with the water-repellent cellulose fibers. In this embodiment, a plurality of hydrophilic fibers may be used, each having different material, fiber length, and fineness.

[0043] The hydrophilic fiber may be one in which, when the sedimentation rate is measured by the method described in the section on the evaluation method for water repellency of water-repellent cellulose fibers, the sample sinks below the water surface within 60 seconds. The hydrophilic fiber may be one in which, after the sample is dropped onto the surface of water in a beaker, it absorbs water and sinks below the water surface within, for example, 50 seconds, particularly 45 seconds, and more particularly 30 seconds.

[0044] (adhesive fiber) As described below, the laminated nonwoven fabric of this embodiment may contain adhesive fibers in the first fiber layer, the second fiber layer, or the intermediate fiber layer. The adhesive fibers serve to bond the fibers together in the laminated nonwoven fabric, improving the strength of the laminated nonwoven fabric and preventing excessive stretching of the laminated nonwoven fabric. The adhesive fibers are generally synthetic fibers made of thermoplastic resins and are thermally adhesive fibers that exhibit adhesive properties when heated, but they do not have to be thermally adhesive as long as they have adhesive properties, and may be fibers other than synthetic fibers. The adhesive fibers may be the above-mentioned hydrophilic fibers that have adhesive properties.

[0045] When the adhesive fiber is a synthetic fiber, the synthetic fiber may be made of one or more thermoplastic resins selected from the group consisting of 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, propylene copolymers containing 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-based resins such as nylon 6, nylon 12, and nylon 66; acrylic-based resins; engineering plastics such as polycarbonate, polyacetal, polystyrene, and cyclic polyolefins, and elastomers thereof.

[0046] Synthetic fibers may be monofilaments made of a single component (also referred to as "single section") and / or composite fibers made of multiple components (also referred to as "sections"). Composite fibers may be, for example, concentric or eccentric sheath-core composite fibers, islands-in-the-sea composite fibers, side-by-side composite fibers, or splittable composite 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 composite fibers, each section constituting the fiber may be made of a single resin, or a mixture of two or more resins.

[0047] When the synthetic fiber is a monofilament, the monofilament may be made of one or more resins selected from the group consisting of the polyolefin resins, polyester resins, polyamide resins, and acrylic resins. More specifically, polyethylene monofilament, polypropylene monofilament, polyethylene terephthalate monofilament, etc. may be used.

[0048] When the synthetic fiber is a composite fiber, two or more components may be arranged so that the thermoplastic resin with the lowest melting point constitutes part of the fiber surface. In this case, when heat is applied under conditions that melt or soften the component consisting of the thermoplastic resin with the lowest melting point (hereinafter referred to as the "low-melting component") during the process of producing a nonwoven fabric, the low-melting component becomes the adhesive component. Examples of resin combinations (first / second) that constitute composite fibers consisting of a first component, which is a thermoplastic resin with a higher melting point, and a second component, which is a thermoplastic resin with a lower melting point, include combinations of polyester-based resins and polyolefin-based resins, such as polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, and polyethylene terephthalate / propylene copolymers; combinations of two types of polyolefin-based thermoplastic resins, such as polypropylene / polyethylene and polypropylene / propylene copolymers; and combinations of two types of polyester-based resins with different melting points.

[0049] Alternatively, the combination of the first and second components may be a combination of biodegradable resins, and such a combination can increase the proportion of biodegradable fibers in the laminated nonwoven fabric. Specifically, by using polylactic acid as the first component and polybutylene succinate as the second component, the adhesive fiber can be made biodegradable.

[0050] The thermoplastic resins exemplified as components of the single fiber or composite fiber may contain other components as long as they contain 50% by mass or more of the specifically specified thermoplastic resin. The specifically specified thermoplastic resin may be contained in an amount of 80% by mass or more, or 90% by mass or more, or the components may consist essentially of the specifically specified thermoplastic resin. The term "substantially" is used here taking into consideration that thermoplastic resins typically contain various additives. For example, in the combination of polyethylene terephthalate / polyethylene, the "polyethylene" may contain other thermoplastic resins and additives as long as it contains 50% by mass or more of polyethylene. This also applies to the examples below.

[0051] When the synthetic fiber is a concentric or eccentric core-sheath composite fiber in which a thermoplastic resin with a higher melting point constitutes the core component as a first component and a thermoplastic resin with a lower melting point constitutes the sheath component as a second component, the core / sheath combination may be, for example, polypropylene / polyethylene, polypropylene / propylene-ethylene copolymer, polypropylene / propylene-butene-1-ethylene copolymer, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polyethylene terephthalate / propylene copolymer, polytrimethylene terephthalate / polyethylene, polybutylene terephthalate / polyethylene, or polyethylene terephthalate / copolyester (e.g., polyethylene terephthalate copolymerized with isophthalic acid). These resin combinations may also be used in splittable composite fibers.

[0052] In the case of core-sheath type composite fibers, the volume ratio of the core component to the sheath component (core component:sheath component) is preferably 80:20 to 20:80, more preferably 70:30 to 30:70, and even more preferably 60:40 to 40:60.

[0053] In the case of splittable conjugate fibers, the volume ratio of the two components (first:second) is preferably 80:20 to 20:80, more preferably 70:30 to 30:70, and even more preferably 60:40 to 40:60. In the case of splittable conjugate fibers, the number of divisions (i.e., the number of sections in the conjugate fiber) may be, for example, 4 to 32, particularly 4 to 20, and more particularly 6 to 10.

[0054] In this embodiment, core-sheath composite fibers (concentric or eccentric) in which the first component / second component combination is polyethylene terephthalate / copolymer polyester, polypropylene / polyethylene, or polyethylene terephthalate / polyethylene can be preferably used as adhesive fibers. These fibers are preferably used because they exhibit adhesiveness at relatively low temperatures (110°C or higher and 130°C or lower) and make the texture of the nonwoven fabric soft after bonding.

[0055] The fineness of the adhesive fiber may be, for example, 1.0 dtex or more and 4.0 dtex or less, particularly 1.5 dtex or more and 2.5 dtex or less, more particularly 1.6 dtex or more and 2.4 dtex or less, and even more particularly 1.7 dtex or more and 2.2 dtex or less. If the fineness of the adhesive fiber is too small, the strength of the laminated nonwoven fabric may be low and the laminated nonwoven fabric may be prone to stretching. If the fineness of the adhesive fiber is too large, the laminated nonwoven fabric may feel stiff to the touch. If the laminated nonwoven fabric is prone to stretching, for example, when the laminated nonwoven fabric is used as a face mask, the openings located at the positions of the eyes and mouth may become misaligned.

[0056] In particular, when the adhesive fiber is a splittable conjugate fiber, the splittable conjugate fiber may have a fineness of 1.0 dtex or more and 4.0 dtex or less before splitting, and may give adhesive fibers of 0.1 dtex or more and less than 1.0 dtex after splitting.

[0057] The fiber length of the adhesive fiber is not particularly limited and may be appropriately selected depending on the manufacturing method of the laminated nonwoven fabric, etc. For example, when the second fiber layer is manufactured by preparing a carded web in the manufacturing of the laminated nonwoven fabric, the adhesive fiber may be a short fiber. The fiber length of this short fiber may be, for example, 10 mm or more and 100 mm or less, particularly 20 mm or more and 75 mm or less, and more particularly 30 mm or more and 65 mm or less. Alternatively, when the second fiber layer is manufactured by an air-laying method, the fiber length may be, for example, 2 mm or more and 20 mm or less.

[0058] (other fibers) The laminated nonwoven fabric of this embodiment may contain fibers other than the water-repellent and hydrophilic cellulose fibers, hydrophilic fibers, and adhesive fibers described above. For example, the first fibrous layer may contain hydrophilic fibers other than cellulose fibers as fibers other than the water-repellent and hydrophilic cellulose fibers.

[0059] Alternatively, the other fibers may be, for example, synthetic fibers that do not function as adhesive fibers. Specifically, when synthetic fibers that exhibit adhesive properties when heated at T°C are used as adhesive fibers, synthetic fibers with a melting point higher than T°C that do not exhibit adhesive properties when heated at T°C may be included as other fibers. Therefore, whether a synthetic fiber is included as an adhesive fiber or as other fibers is determined by the synthetic fibers also included in the nonwoven fabric, and a certain synthetic fiber may be included as an adhesive fiber or as other fibers. Alternatively, if heat treatment at a temperature equal to or higher than the temperature at which the synthetic fiber exhibits adhesive properties is not performed during the manufacturing process of the laminated nonwoven fabric, the synthetic fiber will be included as other fiber rather than as an adhesive fiber.

[0060] For example, when a core-sheath type bicomponent fiber made of polyester (core) / polypropylene (sheath) is used together with a core-sheath type bicomponent fiber made of a combination of polypropylene (core) / polyethylene (sheath), polyethylene is included as another fiber because it exhibits thermal bonding at the lowest temperature. On the other hand, when this is used together with a splittable bicomponent fiber made of a combination of polyethylene terephthalate / nylon 6, polypropylene is included as an adhesive fiber because it exhibits thermal bonding at the lowest temperature.

[0061] The fineness of the other fibers may be, for example, 1.0 dtex or more and 4.0 dtex or less, particularly 1.3 dtex or more and 2.5 dtex or less, and more particularly 1.4 dtex or more and 2.2 dtex or less. If the fineness of the other fibers is too small, neps may occur in the nonwoven fabric, affecting the feel, whereas if the fineness is too large, the surface of the nonwoven fabric may become rough, resulting in a poor feel to the touch.

[0062] The fiber length of the other fibers is not particularly limited and may be appropriately selected depending on the manufacturing method of the nonwoven fabric, etc. The relationship between the manufacturing method of the laminated nonwoven fabric (the manufacturing method of the fiber layer) and the fiber length is as explained in relation to the water-repellent cellulose fibers and adhesive fibers.

[0063] (Nonwoven fabric composition) The laminated nonwoven fabric of this embodiment is formed by integrating a first fiber layer, a second fiber layer, and an intermediate fiber layer located between these fiber layers. In this laminated nonwoven fabric, the first fiber layer contains water-repellent cellulose fibers and hydrophilic cellulose fibers, the second fiber layer contains hydrophilic fibers, and the intermediate fiber layer contains hydrophilic cellulose fibers with a fiber length of less than 10 mm. The three fiber layers are integrated by entanglement of the fibers. When this laminated nonwoven fabric is used as a liquid-impregnated skin dressing sheet, either the first fiber layer or the second fiber layer can be used as the skin-contacting surface.

[0064] The first fiber layer contains both water-repellent and hydrophilic cellulose fibers. The water-repellent cellulose fibers improve the adhesion between the sheet and the skin when the first fiber layer is brought into contact with the skin. The hydrophilic cellulose fibers ensure the entanglement of the fibers and the integrity of the sheet when the fibers are entangled by spraying a high-pressure fluid stream, particularly a high-pressure water stream, as described below. If the first fiber layer is composed only of water-repellent cellulose fibers, the fibers within the first fiber layer and between the first fiber layer and the second fiber layer may not be sufficiently entangled, resulting in a loss of sheet integrity. On the other hand, if the proportion of hydrophilic cellulose fibers in the first fiber layer is too high, the fibers may be too tightly entangled, reducing the adhesion of the surface of the first fiber layer.

[0065] In this embodiment, the first fiber layer may contain 10% to 90% by mass of water-repellent cellulose fibers and 10% to 90% by mass of hydrophilic cellulose fibers, based on the total mass of the first fiber layer. The proportion of water-repellent cellulose fibers may be 30% to 70% by mass, more particularly 40% to 60% by mass, and even more particularly 45% to 55% by mass. The proportion of hydrophilic cellulose fibers may be 30% to 70% by mass, more particularly 40% to 60% by mass, and even more particularly 45% to 55% by mass. Here, the proportion of fibers contained in the first fiber layer refers to the proportion of fibers contained in the first fiber layer before being integrated with other layers. Therefore, even if some fibers constituting other layers are mixed into the first fiber layer due to integration with other layers, the mixed fibers are not included in the first fiber layer.

[0066] Alternatively, in the laminated nonwoven fabric of this embodiment, the first fibrous layer may contain water-repellent cellulose fibers and hydrophilic cellulose fibers so that the hydrophilicity of the surface of the first fibrous layer of the laminated nonwoven fabric falls within a specific range. The hydrophilicity of the surface of the first fiber layer of the laminated nonwoven fabric may be measured, for example, using the method described in "JIS L 1907:2010 Test method for water absorption of textile products" or "JIS R 3257:1999 Test method for wettability of substrate glass surfaces."

[0067] For example, the amounts of water-repellent cellulose fibers and hydrophilic cellulose fibers in the first fibrous layer may be adjusted by adjusting the hydrophilicity range so that the first fibrous layer does not contain too much water-repellent cellulose fibers and the hydrophilic cellulose fibers so that the first fibrous layer does not contain too little water-repellent cellulose fibers. In this case, the two hydrophilicity ranges may be measured by different methods.

[0068] In this embodiment, the three fiber layers are integrated by entanglement of the fibers, and therefore it may be difficult to determine the proportion of fibers contained in each fiber layer before integration due to the fibers of each fiber layer migrating to other fiber layers, etc. In such cases, measuring the hydrophilicity can be an indicator of whether the surface of the first fiber layer has adequate water repellency due to the water-repellent cellulose fibers.

[0069] In this embodiment, the first fibrous layer may contain fibers other than water-repellent cellulose fibers and hydrophilic cellulose fibers. When the first fibrous layer contains fibers other than water-repellent cellulose fibers and hydrophilic cellulose fibers, the proportion of such fibers may be, for example, 40% by mass or less, particularly 30% by mass or less, and more particularly 20% by mass or less, based on the total mass of the first fibrous layer. If the proportion of fibers other than water-repellent cellulose fibers and hydrophilic cellulose fibers is too high, the proportion of water-repellent cellulose fibers and / or hydrophilic cellulose fibers will decrease, which may reduce the sheet's adhesion to the skin or result in insufficient entanglement of the fibers. The first fibrous layer may be composed only of water-repellent cellulose fibers and hydrophilic cellulose fibers.

[0070] The second fiber layer contains hydrophilic fibers. The second fiber layer may not contain water-repellent cellulose fibers, or if it does contain them, it may contain less than 10% by mass, preferably 5% by mass or less. When the second fiber layer contains water-repellent cellulose fibers, the proportion (% by mass) of the water-repellent cellulose fibers in the second fiber layer based on the total mass of the second fiber layer is preferably smaller than the proportion (% by mass) of the water-repellent cellulose fibers in the first fiber layer based on the total mass of the first fiber layer. More specifically, for example, it is preferable to select the proportion of the water-repellent cellulose fibers in the second fiber layer so that the proportion of the water-repellent cellulose fibers in the first fiber layer is more than 40% by mass higher than the proportion of the water-repellent cellulose fibers in the second fiber layer. The second fiber layer serves to ensure the mechanical strength of the laminated nonwoven fabric. As described below, when fibers are entangled by spraying a high-pressure fluid stream, particularly a high-pressure water stream, the inclusion of hydrophilic fibers in the second fiber layer can strengthen the entanglement of the fibers, thereby increasing the mechanical strength of the nonwoven fabric. On the other hand, water-repellent cellulose fibers have a particularly low affinity for water and therefore tend not to contribute to entanglement of the fibers. Therefore, in this embodiment, the proportion of water-repellent cellulose fibers in the second fiber layer is preferably smaller than the proportion in the first fiber layer, and it is more preferable that the second fiber layer does not contain water-repellent cellulose fibers.

[0071] Furthermore, the high content of hydrophilic fibers in the second fiber layer allows the second fiber layer to retain a large amount of liquid. In particular, when the hydrophilic fibers are hydrophilic cellulose fibers, the fibers exhibit high liquid absorption, and when a large amount of these fibers is contained in the second fiber layer, the second fiber layer can retain even more liquid. Therefore, by balancing the water absorption properties of the hydrophilic fibers contained therein with the small inter-fiber voids due to high fluid (e.g., water) entanglement properties, the second fiber layer can have a different fiber composition from the first fiber layer, with liquid retention properties similar to or equivalent to those of the first fiber layer.

[0072] In this embodiment, the second fiber layer may contain hydrophilic fibers in an amount of 50% by mass or more, based on the total mass of the second fiber layer. The proportion of hydrophilic fibers may be particularly 70% by mass or more, more particularly 80% by mass or more, and even more particularly 90% by mass or more. The upper limit of the proportion of hydrophilic fibers may be, for example, 100% by mass, particularly 95% by mass, and more particularly 90% by mass. Here, the proportion of fibers contained in the second fiber layer is the proportion of fibers contained in the second fiber layer before being integrated with the first fiber layer and the intermediate fiber layer. Therefore, even if some of the fibers constituting the first fiber layer and the intermediate fiber layer are mixed into the second fiber layer due to integration of these layers, the mixed fibers are not included in the second fiber layer.

[0073] When the second fibrous layer contains water-repellent cellulose fibers, it may contain 50% by mass or less of water-repellent cellulose fibers, based on the total mass of the second fibrous layer. The proportion of water-repellent cellulose fibers may be particularly 30% by mass or less, more particularly less than 10% by mass, and even more particularly 5% by mass or less. The second fibrous layer may contain no water-repellent cellulose fibers, or may contain 0% by mass or more, particularly more than 0% by mass, more particularly 5% by mass or more, and even more particularly 10% by mass or more, based on the total mass of the second fibrous layer.

[0074] As described above, the laminated nonwoven fabric of this embodiment is designed to prevent a significant difference in adhesion between the two surfaces even if the first and second fiber layers have different fiber compositions. Therefore, even if the second fiber layer contains less than 10% by mass, particularly 5% by mass or less, of water-repellent cellulose fiber, or even if it contains no water-repellent cellulose fiber at all, the final liquid-impregnated skin dressing sheet will not have a noticeable difference in adhesion between the front and back surfaces.

[0075] Alternatively, in the laminated nonwoven fabric of this embodiment, the second fiber layer may contain hydrophilic fibers so that the hydrophilicity of the surface of the second fiber layer of the laminated nonwoven fabric falls within a specific range. The hydrophilicity of the surface of the second fiber layer of the laminated nonwoven fabric may be measured using the method described in relation to the measurement of the hydrophilicity of the surface of the first fiber layer, or the like.

[0076] Alternatively, in the laminated nonwoven fabric of this embodiment, the first fibrous layer may contain water-repellent cellulose fibers and hydrophilic cellulose fibers, and the second fibrous layer may contain hydrophilic fibers, such that the runoff ratio (1 / 2) between the surface of the first fibrous layer and the surface of the second fibrous layer is 1.1 or greater. The runoff ratio between the surface of the first fibrous layer and the surface of the second fibrous layer may be particularly 1.2 or greater, more particularly 1.3 or greater. The upper limit of the runoff ratio may be, for example, 6.5, particularly 5.5, and more particularly 5.0. A larger runoff ratio between both surfaces means that the water repellency of the surface of the first fibrous layer is higher than that of the second fibrous layer, and more water-repellent cellulose fibers are present on the surface of the first fibrous layer. The runoff ratio can be determined by the following method.

[0077] (How to calculate the runoff ratio) Place a piece of filter paper (30cm x 10cm) on a test table inclined at 25° and secure it with double-sided tape. Place the sample piece on top of the filter paper. The separatory funnel is set so that its tip is 2.5 cm from the upper edge of the test stand, which is the position where the liquid is dropped. 20 ml of distilled water colored blue with methylene blue is poured into the separatory funnel. A dry absorbent (product name: Kimtowel, manufactured by Nippon Paper Crecia Co., Ltd.) is placed at the bottom of the test stand. Distilled water is then dropped from the separatory funnel, and the weight of the absorbent after the drop is measured. The difference in weight of the absorbent before and after the distilled water is poured corresponds to the amount of distilled water that was not absorbed by the nonwoven fabric and flowed over the nonwoven fabric. The above test was performed on both sides of the sample piece, five times for each side, and the minimum and maximum values ​​of the five measurements were subtracted to obtain the total runoff for each side. The total values ​​obtained for each side were used to calculate the runoff ratio of the first fiber layer / second fiber layer.

[0078] When the runoff ratio (first / second) on both sides is 1.1 or more, the effect of including a large amount of water-repellent cellulose fiber in the first fiber layer is easily obtained, and the softness and adhesion of the first fiber layer can be improved. When the runoff ratio on both sides is too small, the proportions of water-repellent cellulose fiber contained in both fiber layers become similar. When the runoff ratio on both sides is closer to 1 and the runoffs on both sides are large, the proportion of water-repellent cellulose fiber is high, making the entire nonwoven fabric too soft and resulting in insufficient mechanical properties of the nonwoven fabric. When the runoff ratio on both sides is closer to 1 and the runoffs on both sides are small, the proportion of water-repellent cellulose fiber contained in the first fiber layer is low, and sufficient adhesion may not be achieved. On the other hand, when the runoff ratio on both sides is too large, the proportion of water-repellent cellulose fiber contained in the first fiber layer is high, making it difficult to obtain a nonwoven fabric that exhibits equivalent adhesion on both sides.

[0079] In this embodiment, the second fiber layer may contain fibers other than hydrophilic fibers. When the second fiber layer contains fibers other than hydrophilic fibers, the proportion of such fibers may be, for example, 40% by mass or less, particularly 30% by mass or less, and more particularly 25% by mass or less, based on the total mass of the second fiber layer. If the proportion of fibers other than hydrophilic fibers is too high, the proportion of hydrophilic fibers will be reduced, and the liquid retention and / or mechanical strength of the laminated nonwoven fabric may be insufficient. The second fiber layer may be composed only of hydrophilic fibers.

[0080] In this embodiment, the intermediate fiber layer may contain 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the intermediate fiber layer. The proportion of hydrophilic cellulose fibers having a fiber length of less than 10 mm may be particularly 75% by mass or more, more particularly 80% by mass or more. Alternatively, the intermediate fiber layer may be composed solely of hydrophilic cellulose fibers having a fiber length of less than 10 mm. The intermediate fiber layer may also contain adhesive fibers or other fibers other than hydrophilic cellulose fibers having a fiber length of less than 10 mm. The fiber length of these other fibers is preferably less than 10 mm. Here, the proportion of each fiber contained in the intermediate fiber layer is the proportion of the fiber contained in the intermediate fiber layer before it is integrated with other layers. Therefore, even if some of the fibers constituting the other layers are mixed into the intermediate fiber layer due to integration with other layers, the mixed fibers are not included in the intermediate fiber layer.

[0081] In this embodiment, the intermediate fibrous layer may be a wet-laid nonwoven fabric. More specifically, the intermediate fibrous layer may be a fibrous web provided as a wet-laid nonwoven fabric, which is entangled and integrated with the fibers of the first fibrous layer and the second fibrous layer.

[0082] The first fiber layer, the second fiber layer, or the intermediate fiber layer may contain adhesive fibers. In this case, it is preferable that the fibers in the laminated nonwoven fabric are bonded together by the adhesive fibers. The adhesive fibers bond the fibers together, which can further improve the mechanical strength of the laminated nonwoven fabric.

[0083] When the first fiber layer, the second fiber layer, or the intermediate fiber layer contains adhesive fibers, the adhesive fibers may be contained in an amount of, for example, 10% by mass to 30% by mass, particularly 15% by mass to 28% by mass, and more particularly 20% by mass to 25% by mass, based on the total mass of each fiber layer. If the proportion of adhesive fibers is too high, the liquid retention properties of each fiber layer, and ultimately the liquid retention properties of the entire laminated nonwoven fabric, may decrease.

[0084] When the adhesive fiber is a splittable conjugate fiber, the splittable conjugate fiber before splitting may be contained in an amount of 10% by mass to 30% by mass, particularly 15% by mass to 28% by mass, and more particularly 20% by mass to 25% by mass, based on the total mass of each fiber layer. After splitting, the adhesive fiber may be contained in an amount of 5% by mass to 15% by mass, particularly 7.5% by mass to 14% by mass, and more particularly 10% by mass to 12.5% ​​by mass, based on the total mass of each fiber layer.

[0085] When a high-pressure fluid stream, particularly a high-pressure water stream, is sprayed to entangle the fibers according to the manufacturing method described below, the entanglement of the fibers between the intermediate fiber layer and the second fiber layer tends to be more advanced. In this embodiment, the degree of entanglement of the fibers between the first fiber layer and the intermediate fiber layer tends to be less than the degree of entanglement of the fibers between the second fiber layer and the intermediate fiber layer. This is thought to be because the first fiber layer contains a large amount of water-repellent cellulose fibers, which tends to result in a relatively weak entanglement of the first fiber layer and a bulky state, and the entanglement of the fibers constituting the intermediate fiber layer is also relatively weak.

[0086] When the hydrophilic fiber of the second fiber layer is cotton, cotton is more likely to be entangled with the intermediate fiber layer than, for example, viscose rayon, and, combined with the unevenness of cotton fineness and fiber length, the fiber arrangement on the surface of the second fiber layer tends to be random.On the other hand, when the hydrophilic fiber of the second fiber layer is a regenerated fiber such as rayon, the fiber arrangement on the surface of the second fiber layer tends to be relatively uniform in one direction (machine direction).

[0087] In the laminated nonwoven fabric of this embodiment, when the second fibrous layer contains hydrophilic cellulose fibers as the hydrophilic fibers, the cellulose fibers (including both water-repellent cellulose fibers and hydrophilic cellulose fibers, as well as cellulose fibers that do not fit into either category) may comprise, for example, 70% by mass or more, particularly 85% by mass or more, and more particularly 95% by mass or more, based on the total mass of the laminated nonwoven fabric. The higher the cellulose fiber content, the more biodegradable the laminated nonwoven fabric becomes, and sheets using this can be provided as environmentally friendly products. The laminated nonwoven fabric of this embodiment may be composed solely of cellulose fibers.

[0088] In this embodiment, the first fiber layer, the second fiber layer, and the intermediate fiber layer located therebetween are integrated by entanglement of the fibers. The entanglement of the fibers may be achieved, for example, by needle punching or high-pressure fluid flow (particularly water flow) entanglement. In this embodiment, the fibers are preferably integrated by high-pressure fluid flow (particularly water flow) entanglement. High-pressure fluid flow entanglement can tightly entangle the fibers, resulting in a smooth surface of the nonwoven fabric. Furthermore, when the high-pressure fluid flow is high-pressure water flow, the entanglement of the hydrophilic cellulose fibers contained in the first fiber layer and the intermediate fiber layer and the hydrophilic fibers contained in the second fiber layer is likely to be more firmly achieved.

[0089] In the laminated nonwoven fabric of this embodiment, when some or all of the fiber layers contain adhesive fibers, the fibers may be bonded to each other by the adhesive fibers. By bonding the fibers to each other in addition to entangling them, the mechanical strength of the nonwoven fabric can be further improved.

[0090] In this embodiment, the basis weight of each fiber layer is not particularly limited. The basis weight of the first fiber layer is, for example, 10 g / m 2 Above, especially 15g / m 2 or more, more particularly 20 g / m 2 The upper limit of the basis weight of the first fiber layer is, for example, 70 g / m 2 and especially 50 g / m 2 , more particularly 30 g / m 2If the basis weight of the first fiber layer is too large, the thickness increases, which can lead to insufficient entanglement of the fibers, and the surface of the first fiber layer can easily become frayed. If the basis weight of the first fiber layer is too small, the intermediate fiber layer can easily appear on the surface of the nonwoven fabric, which can easily cause disruption of the fabric texture during entanglement.

[0091] The basis weight of the second fiber layer is, for example, 10 g / m 2 or more, in particular 15 g / m 2 More particularly, 20 g / m 2 The upper limit of the basis weight of the second fiber layer is, for example, 70 g / m 2 and especially 50 g / m 2 , more particularly 30 g / m 2 If the basis weight of the second fiber layer is too large, the thickness increases, which can lead to insufficient entanglement of the fibers, and the surface of the second fiber layer can easily become frayed. If the basis weight of the second fiber layer is too small, the intermediate fiber layer can easily appear on the surface of the nonwoven fabric, which can easily cause disruption of the fabric texture during entanglement.

[0092] The weight of the intermediate fiber layer is, for example, 10 g / m 2 Above, especially 12g / m 2 or more, more particularly 13 g / m 2 The upper limit of the weight per unit area of ​​the intermediate fiber layer is, for example, 40 g / m 2 and especially 35 g / m 2 , more particularly 30 g / m 2 If the basis weight of the intermediate fiber layer is too large, the fibers may not be sufficiently entangled between the layers. If the basis weight of the intermediate fiber layer is too small, the intermediate fiber layer may not be able to retain a sufficient amount of liquid.

[0093] The ratio of the basis weights of the first fiber layer to the second fiber layer (first / second) may be, for example, 7 / 1 to 1 / 7, particularly 3 / 1 to 1 / 3, and more particularly 1.5 / 1 to 1 / 1.5. When the ratio of the basis weights of the two fiber layers is within this range, the fibers can be sufficiently entangled. Furthermore, the ratio of the basis weights of the intermediate fiber layer to the second fiber layer (intermediate / second) may be, for example, 7 / 1 to 1 / 7, particularly 3 / 1 to 1 / 3, and more particularly 1.5 / 1 to 1 / 1.5. When the ratio of the basis weights of the intermediate fiber layer to the second fiber layer is within this range, the intermediate fiber layer and the second fiber layer are more densely entangled, and the intermediate fiber layer is more likely to retain liquid.

[0094] The basis weight of the entire laminated nonwoven fabric is not particularly limited, and may be, for example, 30 g / m 2 or more, in particular 40 g / m 2 More particularly, 45 g / m 2 The upper limit of the basis weight of the entire laminated nonwoven fabric is, for example, 120 g / m 2 and in particular 100 g / m 2 , more particularly 80 g / m 2 The basis weight of the nonwoven fabric is determined depending on the application, the amount of liquid to be impregnated, etc. For example, when the sheet is a face mask, the basis weight of the nonwoven fabric may be 30 g / m 2 More than 80g / m 2 Below, especially 40g / m 2 More than 75g / m 2 If the sheet is an eye sheet (also called an eye pack), the basis weight of the nonwoven fabric may be 40 g / m 2 More than 80g / m 2 Below, especially 45g / m 2 More than 75g / m 2 If the basis weight of the entire laminated nonwoven fabric is too large, the sheet will have a large mass and may be easily peeled off due to its weight when applied to the skin. If the basis weight of the entire laminated nonwoven fabric is too small, it may not be able to hold a sufficient amount of liquid.

[0095] The thickness of the laminated nonwoven fabric when dry and under a load of 294 Pa may be, for example, 0.2 mm or more, particularly 0.3 mm or more, and more particularly 0.4 mm or more. The thickness of the nonwoven fabric may be, for example, 1.5 mm or less, particularly 1.3 mm or less, and more particularly 1.2 mm or less. The thickness of the entire nonwoven fabric when dry and under a load of 1.96 kPa may be, for example, 0.2 mm or more, particularly 0.3 mm or more, and more particularly 0.4 mm or more. The thickness of the nonwoven fabric under the same load may be, for example, 1.3 mm or less, particularly 1.1 mm or less, and more particularly 0.9 mm or less. If the thickness of the laminated nonwoven fabric is too small, the amount of liquid that can be impregnated into the nonwoven fabric may be reduced, making it difficult to deliver a predetermined amount of liquid to the skin. If the thickness of the entire laminated nonwoven fabric is too large, it may be difficult to fit the sheet to the curved surface of the skin, and the sheet may partially float, making it difficult to evenly cover the skin with the entire sheet.

[0096] The laminated nonwoven fabric of this embodiment may exhibit a water retention rate of, for example, 1300% or less when measured using the method described in the Examples below. The water retention rate of the nonwoven fabric of this embodiment may particularly be 1200% or less, more particularly 1100% or less, and even more particularly 1000% or less. The lower limit of the water retention rate of this embodiment may be, for example, 700%, particularly 750%, and more particularly 800%. Because the nonwoven fabric of this embodiment contains water-repellent cellulose fibers, it tends not to exhibit a high water retention rate. A laminated nonwoven fabric with an excessively high water retention rate can reduce the amount of liquid remaining in the discarded sheet after covering the skin and treating the skin with liquid, thereby reducing liquid loss.

[0097] The water retention rate may vary depending on the type and ratio of fibers constituting each fiber layer and the basis weight of the laminated nonwoven fabric. Therefore, in the laminated nonwoven fabric of this embodiment, these may be adjusted so that the above-mentioned water retention rate is obtained.

[0098] The laminated nonwoven fabric of this embodiment may have a tensile strength in the MD direction when dry of, for example, 50 N / 5 cm or more and 160 N / 5 cm or less, particularly 55 N / 5 cm or more and 150 N / 5 cm or less, and more particularly 60 N / 5 cm or more and 140 N / 5 cm or less. If the tensile strength in the MD direction when dry is too low, the fabric may break during product processing. If the tensile strength in the MD direction when dry is too high, the texture of the nonwoven fabric may not be good.

[0099] The laminated nonwoven fabric of this embodiment may have a tensile strength in the CD direction when dry of, for example, 4.5 N / 5 cm or more and 30 N / 5 cm or less, particularly 5.0 N / 5 cm or more and 27 N / 5 cm or less, and more particularly 6.0 N / 5 cm or more and 25 N / 5 cm or less. If the tensile strength in the CD direction when dry is too low, vertical creases are likely to occur in the nonwoven fabric. If the tensile strength in the CD direction when dry is too high, the texture of the nonwoven fabric may not be good.

[0100] The laminated nonwoven fabric of this embodiment may have an MD elongation percentage of, for example, 15% to 60%, particularly 20% to 50%, and more particularly 22% to 48% when dry. The laminated nonwoven fabric of this embodiment may also have a CD elongation percentage of, for example, 40% to 150%, particularly 50% to 140%, and more particularly 55% to 130% when dry. If the MD or CD elongation percentage is too low when dry, the texture of the nonwoven fabric may be poor. If the MD or CD elongation percentage is too high when dry, defects are more likely to occur during punching during product processing.

[0101] The laminated nonwoven fabric of this embodiment may have a stress at 10% elongation in the MD direction when dry of, for example, 7.0 N / 5 cm to 60 N / 5 cm, particularly 8.0 N / 5 cm to 50 N / 5 cm, and more particularly 9.0 N / 5 cm to 40 N / 5 cm. The laminated nonwoven fabric of this embodiment may also have a stress at 10% elongation in the CD direction when dry of, for example, 0.7 N / 5 cm to 4.5 N / 5 cm, particularly 0.8 N / 5 cm to 4.0 N / 5 cm, and more particularly 0.9 N / 5 cm to 3.8 N / 5 cm. If the stress at 10% elongation in the MD or CD direction when dry is too low, defects are likely to occur during punching during product processing. If the stress at 10% elongation in the MD or CD direction when dry is too high, the texture of the nonwoven fabric may be poor.

[0102] The wet tensile strength of the laminated nonwoven fabric of this embodiment in the MD direction may be, for example, 50 N / 5 cm to 150 N / 5 cm, particularly 53 N / 5 cm to 140 N / 5 cm, and more particularly 55 N / 5 cm to 130 N / 5 cm. The wet tensile strength of the laminated nonwoven fabric of this embodiment may be, for example, 7.0 N / 5 cm to 35 N / 5 cm, particularly 7.5 N / 5 cm to 32 N / 5 cm, and more particularly 8.0 N / 5 cm to 30 N / 5 cm. If the wet tensile strength in the MD or CD direction is too low, the finished liquid-impregnated skin dressing sheet may break when removed. If the wet tensile strength in the MD or CD direction is too high, the laminated nonwoven fabric may be difficult to bend, which may reduce its ability to conform to uneven skin.

[0103] The laminated nonwoven fabric of this embodiment may have an MD elongation percentage when wet of, for example, 20% to 80%, particularly 25% to 75%, and more particularly 28% to 72%. The laminated nonwoven fabric of this embodiment may also have a CD elongation percentage when wet of, for example, 60% to 160%, particularly 65% ​​to 155%, and more particularly 70% to 150%. If the MD or CD elongation percentage when wet is too low, it becomes difficult to adhere the laminated nonwoven fabric to the skin. If the MD or CD elongation percentage when wet is too high, the finished liquid-impregnated skin dressing sheet may stretch significantly when removed.

[0104] The laminated nonwoven fabric of this embodiment may have a stress at 10% elongation in the MD direction when wet of, for example, 2.0 N / 5 cm or more and 30 N / 5 cm or less, particularly 2.5 N / 5 cm or more and 20 N / 5 cm or less, and more particularly 3.0 N / 5 cm or more and 15 N / 5 cm or less. The laminated nonwoven fabric of this embodiment may also have a stress at 10% elongation in the CD direction when wet of, for example, 0.20 N / 5 cm or more and 2.5 N / 5 cm or less, particularly 0.28 N / 5 cm or more and 2.0 N / 5 cm or less, and more particularly 0.30 N / 5 cm or more and 1.8 N / 5 cm or less. If the stress at 10% elongation in the MD or CD direction when wet is too low, it becomes difficult for the laminated nonwoven fabric to adhere to the skin. If the stress at 10% elongation in the MD or CD direction when wet is too high, and if the liquid-impregnated skin dressing sheet has cutouts for eyes, mouths, etc., the positions of the eyes, mouths, etc. may stretch and shift when applied, making it difficult to use.

[0105] The laminated nonwoven fabric of this embodiment may have a 10% elongation stress per unit basis weight in the CD direction when wet of, for example, 0.0090 N / 5 cm or more, particularly 0.010 N / 5 cm or more. The upper limit of the 10% elongation stress per unit basis weight in the CD direction when wet may be, for example, 0.030 N / 5 cm, particularly 0.025 N / 5 cm, and more particularly 0.020 N / 5 cm. Liquid-impregnated skin application sheets are generally designed to be applied to the skin by grasping both ends of the nonwoven fabric in the CD direction, and the sheet is applied to the skin while being slightly stretched. Therefore, the 10% elongation stress per unit basis weight in the CD direction when wet may affect the extensibility felt by the user when using the sheet. If the stress at 10% elongation per unit basis weight in the CD direction when wet is 0.0090 N / 5 cm or more, the user will feel that the fabric has adequate elongation, and the fabric will also adhere well to the skin.

[0106] The coefficient of variation (CV) of the first fiber layer surface of the laminated nonwoven fabric of this embodiment, measured using a static / dynamic friction measuring device (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.) described below, may be, for example, 0.010 to 0.036, particularly 0.015 to 0.035, and more particularly 0.020 to 0.034. If the coefficient of variation of the dynamic friction coefficient of the first fiber layer surface is too high, the texture of the laminated nonwoven fabric may be unsatisfactory. If the coefficient of variation of the dynamic friction coefficient of the first fiber layer surface is too low, the laminated nonwoven fabric may have difficulty conforming to the unevenness of the skin.

[0107] In the laminated nonwoven fabric of this embodiment, the coefficient of variation (CV) of the second fiber layer surface may be, for example, 0.010 to 0.036, particularly 0.015 to 0.035, and more particularly 0.020 to 0.034. If the coefficient of variation of the dynamic friction coefficient of the second fiber layer surface is too high, the feel of the laminated nonwoven fabric may be poor. If the coefficient of variation of the dynamic friction coefficient of the second fiber layer surface is too low, it may be difficult for the layer to conform to the unevenness of the skin.

[0108] In the laminated nonwoven fabric of this embodiment, the difference between the coefficient of variation of the surface of the first fiber layer and the coefficient of variation of the surface of the second fiber layer, expressed as an absolute value, may be, for example, 0 to 0.005, particularly 0 to 0.004, and more particularly 0 to 0.003. If the difference in the coefficients of variation is within this range, the difference in skin contact between the first fiber layer and the second fiber layer may be less noticeable.

[0109] In the laminated nonwoven fabric of this embodiment, the adhesion strength after 15 minutes (per 5 cm × 8 cm area) of the first fiber layer surface may be, for example, 100 gf to 270 gf, particularly 120 gf to 260 gf, and more particularly 125 gf to 255 gf. The adhesion strength after 15 minutes of the second fiber layer surface may be, for example, 100 gf to 270 gf, particularly 120 gf to 260 gf, and more particularly 125 gf to 255 gf. If the adhesion strength after 15 minutes of the first fiber layer surface and the second fiber layer surface is too high, the laminated nonwoven fabric becomes difficult to peel from the skin. If the adhesion strength after 15 minutes of the first fiber layer surface and the second fiber layer surface is too low, the laminated nonwoven fabric tends to slip off the skin.

[0110] Furthermore, the difference between the adhesion strength of the first fiber layer surface after 15 minutes and the adhesion strength of the second fiber layer surface after 15 minutes, expressed as an absolute value, may be, for example, 40 gf or less, particularly 30 gf or less, and more particularly 20 gf or less, with the lower limit being, for example, 0 gf. The smaller the difference in adhesion strength after 15 minutes between the two fiber layers, the less likely one feels a difference in fit due to the difference in the surface that comes into contact with the skin when the laminated nonwoven fabric is applied to the skin in a liquid-impregnated state. The greater the difference in adhesion strength, the greater the difference in fit between the two surfaces, making it more difficult to use the sheet without distinguishing between the two surfaces.

[0111] The nonwoven fabric of this embodiment may have a dry bending resistance of, for example, 135 cN or less, particularly 115 cN or less, and more particularly 110 cN or less. The lower limit of the dry bending resistance is, for example, 40 cN, particularly 50 cN, and more particularly 60 cN. The nonwoven fabric of this embodiment may have a wet bending resistance of, for example, 100 cN or less, particularly 85 cN or less, and more particularly 75 cN or less. The lower limit of the wet bending resistance is, for example, 25 cN, particularly 30 cN, and more particularly 35 cN. As will be described later, the bending resistance is measured according to the handle-ometer method, and in this embodiment, the sum of the values ​​measured on the four sides of the sample is taken as the bending resistance of the sample, and this is used as an index of the softness of the nonwoven fabric. The larger the handle-ometer value, the more rigid the nonwoven fabric. If the bending resistance is too low, the sheet is difficult to handle, whereas if the bending resistance is too high, the sheet may not conform to the skin when applied to the skin, and may lift up.

[0112] (Nonwoven fabric manufacturing method) The laminated nonwoven fabric of the present embodiment is, for example, preparing a first fibrous web comprising water-repellent cellulosic fibers and hydrophilic cellulosic fibers; creating a second fibrous web comprising hydrophilic fibers; preparing a third fiber web containing 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm; preparing a laminated fiber web by overlapping the first fiber web, the second fiber web, and the third fiber web such that the third fiber web is positioned between the first fiber web and the second fiber web; Subjecting the laminated fiber web to a process for entangling the fibers. The composition can be produced by a production method including the steps of:

[0113] The first fiber web is a web that will become the first fiber layer, the second fiber web is a web that will become the second fiber layer, and the third fiber web is a web that will become the intermediate fiber layer. The types and proportions of fibers contained in the first fiber web and the second fiber web are as described above in relation to the first fiber layer and the second fiber layer, and the types and proportions of fibers contained in the third fiber web are as described above in relation to the intermediate fiber layer, so they will not be described here. The basis weights of the first fiber web and the second fiber web are also as described above in relation to the first fiber layer and the second fiber layer, and the basis weight of the third fiber web is also as described above in relation to the intermediate fiber layer, so they will not be described here.

[0114] The first to third fiber webs are laminated such that the third fiber web is located between the first and second fiber webs. If necessary, a pre-laminate fiber web may be prepared by laminating the first fiber web (or the second fiber web) and the third fiber web, and then laminating the second fiber web (or the first fiber web) onto the pre-laminate fiber web to prepare a laminated fiber web. The pre-laminate fiber web may be prepared by previously integrating the fibers between the fiber webs.

[0115] The first and second fiber webs can be produced by known methods. The form of each fiber web may be selected from, for example, 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 first and second fiber webs may have different forms. If the first fiber web is a carded web, the effect of improving adhesion due to the inclusion of water-repellent cellulose fibers can be easily obtained. If the second fiber web is a carded web, hydrophilic cellulose fibers can easily migrate from the third fiber web to the second fiber web.

[0116] The form of the third fiber web is also not limited and may be any of the forms exemplified above in relation to the first and second fiber webs. Since the third fiber web contains 70% by mass or more of fibers with a fiber length of less than 10 mm, it may be a wetlaid web or an airlaid web in view of the ease of web production using such fibers. Furthermore, the third fiber web may be, for example, a wetlaid nonwoven fabric. In this case, strictly speaking, the third fiber web is not a web in which the fibers are only slightly entangled, but rather a nonwoven fabric in which the fibers are integrated.

[0117] The laminated fiber web having a laminated structure of the first fiber web / third fiber web / second fiber web is subjected to a treatment for entangling the fibers. The treatment for entangling the fibers may be, for example, an entanglement treatment using a high-pressure fluid flow.

[0118] In the high-pressure fluid flow treatment, 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 using high-pressure water (hereinafter also simply referred to as "water flow") as the high-pressure fluid will be described.

[0119] The hydroentanglement treatment is carried out by placing the laminated fiber web on a support and spraying a columnar water stream onto it. For example, the support is preferably a plain weave support of 80 mesh or more and 100 mesh or less. The hydroentanglement treatment may be carried out by spraying water streams at a water pressure of 1 MPa or more and 15 MPa or less onto the front and back surfaces of the laminated fiber web one to five times each from nozzles having orifices with a pore size of 0.05 mm or more and 0.5 mm or less, spaced 0.3 mm or more and 1.5 mm or less. The water pressure is preferably 1 MPa or more and 10 MPa or less, more preferably 1 MPa or more and 7 MPa or less.

[0120] In the hydroentanglement treatment of the laminated fiber web, it is preferable to first spray the water onto the second fiber web side and then onto the first fiber web side. By first exposing the second fiber web to the water stream, entanglement with the hydrophilic fibers contained in the second fiber web progresses to a certain extent, and entanglement with the hydrophilic cellulose fibers in the third fiber web, which serves as the intermediate fiber layer, also progresses. Therefore, even if the water-repellent cellulose fibers repel water when the water stream is subsequently sprayed onto the first fiber web, entanglement by the water stream progresses smoothly. Furthermore, by spraying the water stream onto the second fiber web side first, it becomes easier to transfer short-fiber hydrophilic cellulose fibers from the third fiber web, which serves as the intermediate fiber layer, into the second fiber web. As a result, the adhesion of the second fiber layer in the final nonwoven fabric can be increased, and the difference in adhesion between the two surfaces can be reduced.

[0121] When the first, second, or third fiber web contains adhesive fibers, the laminated fiber webs may be subjected to a bonding treatment to obtain a laminated nonwoven fabric in which the fibers are bonded together. The bonding treatment may be a thermal bonding treatment, or bonding by electron beam irradiation, or ultrasonic welding. By using a heat treatment, the adhesive fibers (e.g., low-melting point components of the composite fibers) melt or soften by heat during the heat treatment, thereby bonding the fibers that make up the laminated fiber webs together.

[0122] The heat treatment may be, for example, a hot air processing treatment in which hot air is blown, a heat roll processing (heat embossing roll processing), or a heat treatment using infrared rays. The hot air processing treatment may be carried out using a device that blows hot air at a predetermined temperature onto the laminated fiber web, for example, a hot air penetration type heat treatment machine or a hot air blowing type heat treatment machine.

[0123] The heat treatment temperature (e.g., the temperature of the hot air) may be a temperature at which the component that constitutes the adhesive fiber and functions as an adhesive component softens or melts. For example, the heat treatment temperature may be a temperature equal to or higher than the melting point of the component. For example, if the adhesive fiber contains polyethylene as a component and polyethylene is the adhesive component, the heat treatment temperature may be 130°C to 150°C, and if polybutylene succinate is the adhesive component, the heat treatment temperature may be 120°C to 133°C.

[0124] (Liquid-impregnated skin covering sheet) By impregnating the laminated nonwoven fabric of this embodiment with a liquid, a liquid-impregnated skin-covering sheet for covering human or animal skin can be obtained. The liquid to be impregnated and the amount of impregnation can be appropriately selected depending on the intended use. When the sheet is provided as a liquid-impregnated skin-covering sheet for personal use, such as a face mask for personal use, an exfoliating sheet, or a décolleté sheet, the sheet may be impregnated with a liquid containing an active ingredient (e.g., a cosmetic product) in an amount of 500 to 2000 parts by weight, particularly 600 to 1800 parts by weight, and more particularly 700 to 1500 parts by weight, per 100 parts by weight of the nonwoven fabric. Examples of active ingredients include, but are not limited to, moisturizing ingredients, exfoliating ingredients, antiperspirants, fragrance ingredients, whitening ingredients, blood circulation-promoting ingredients, UV protection ingredients, and slimming ingredients.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] The liquid-impregnated skin dressing sheet using the laminated nonwoven fabric of this embodiment exhibits similarly good adhesion regardless of whether the first or second fiber layer of the laminated nonwoven fabric is the skin-contacting surface, and the user is unlikely to notice any difference in wearing comfort.

[0129] In the laminated nonwoven fabric of this embodiment, the surface on the side of the first fiber layer contains water-repellent and hydrophilic cellulose fibers. Since most of the constituent fibers are cellulose fibers, the surface is less itchy and provides a pleasant feel. The surface on the side of the second fiber layer is imparted with a feel depending on the type of hydrophilic fiber. For example, when the hydrophilic fiber is cotton, the surface provides a slightly firm and firm feel derived from cotton. Furthermore, the use of natural cotton fiber provides a sense of security for consumers who are highly natural-oriented. When the hydrophilic fiber is viscose rayon, the fibers on the surface of the second fiber layer tend to be aligned in one direction, resulting in an excellent feel and making the entire nonwoven fabric flexible. However, in the laminated nonwoven fabric of this embodiment, the adhesion of the first and second fiber layers to the surface is similar, so even if these fiber layers provide different feel, the impact on wearing comfort is relatively small. [Example]

[0130] The present embodiment will be described below with reference to examples. The following fibers were prepared for use in this example. Water-repellent cellulose fiber 1: Viscose rayon (trade name: Ecorepellent, manufactured by Daiwabo Rayon Co., Ltd.) with a fineness of 1.7 dtex and a fiber length of 40 mm, the surface of which had been treated with a non-fluorinated water repellent agent. When the water repellency of this fiber was evaluated using the method described above, the sample did not settle even after 10 minutes, and almost the entire sample floated on the water surface. The official moisture regain of this fiber was 12.8%, and the secondary swelling index was 48.2%, the average of measurements taken at four points. Water-repellent cellulose fiber 2: fineness 1.7 dtex, fiber length 40 mm, viscose rayon (trade name: Olea, manufactured by Kelheim Fibres GmbH). When the water repellency of this fiber was evaluated using the method described above, the sample did not sink even after 10 minutes, and almost the entire sample floated on the water surface.

[0131] Hydrophilic cellulose fiber A: viscose rayon (product name: SPV, manufactured by Lenzing) with a fineness of 1.7 dtex and a fiber length of 40 mm. When the water repellency (hydrophilicity) of this fiber was evaluated by the method described above, the sedimentation rate was 7 seconds. Hydrophilic cellulose fiber B: cotton fiber having a fineness of 1.0 dtex to 5.0 dtex and a fiber length of 10 mm to 60 mm (average fiber length 20 mm) (product name: MSD, manufactured by Marusan Sangyo Co., Ltd.) When the water repellency (hydrophilicity) of this fiber was evaluated by the above method, the sedimentation velocity was 9 seconds. Hydrophilic cellulose fiber C: viscose rayon with a fineness of 0.9 dtex and a fiber length of 40 mm (product name: BH, manufactured by Daiwabo Rayon Co., Ltd.) When the water repellency (hydrophilicity) of this fiber was evaluated by the above method, the sedimentation speed was 19 seconds. Hydrophilic cellulose fiber D: solvent-spun cellulose fiber (trade name: Lyocell, manufactured by Lenzing) having a fineness of 1.7 dtex and a fiber length of 40 mm. When the water repellency (hydrophilicity) of this fiber was evaluated by the method described above, the sedimentation rate was 6 seconds. Hydrophilic cellulose fiber E: viscose rayon with a fineness of 3.3 dtex and a fiber length of 40 mm (product name: CD, manufactured by Daiwabo Rayon Co., Ltd.) When the water repellency (hydrophilicity) of this fiber was evaluated by the method described above, the sedimentation velocity was 4.2 seconds. Hydrophilic cellulose fiber F: viscose rayon with a fineness of 5.6 dtex and a fiber length of 51 mm (product name: CD, manufactured by Daiwabo Rayon Co., Ltd.) When the water repellency (hydrophilicity) of this fiber was evaluated by the above-mentioned method, the sedimentation velocity was 3.7 seconds.

[0132] In addition, the following nonwoven fabric was prepared as the intermediate fiber layer in this example. Wet-laid nonwoven fabric 1: 100% by mass of wood-derived pulp fiber (fineness approximately 1.0 to 4.0 dtex, fiber length approximately 0.8 mm to 4.5 mm) with a basis weight of 17 g / m 2 Wet-laid nonwoven fabric (manufactured by Habix Co., Ltd.) Wet-laid nonwoven fabric 2: 100% by mass of wood-derived pulp fiber (fineness approximately 1.0 to 4.0 dtex, fiber length approximately 0.8 mm to 4.5 mm) with a basis weight of 26 g / m 2 Wet-laid nonwoven fabric (manufactured by Habix Co., Ltd.)

[0133] Example 1 [First fiber layer] 50% by mass of water-repellent cellulose fiber 1 and 50% by mass of hydrophilic cellulose fiber A were mixed and carded using a parallel carding machine to a target weight of approximately 26.5 g / m 2 A first fibrous web was prepared. [Second fiber layer] Only hydrophilic cellulose fiber B, which is a hydrophilic fiber, was used in a parallel carding machine to achieve a target weight of approximately 26.5 g / m 2 A second fibrous web was prepared. [Laminated nonwoven fabric] A wetlaid nonwoven fabric 1 was layered on the first fibrous web as an intermediate fibrous layer, and a second fibrous web was layered on the wetlaid nonwoven fabric 1 to form a laminated fibrous web. The laminated fibrous web was placed on a 90-mesh plain-weave support and transported at a speed of 4 m / min. A hydroentanglement treatment was then performed in which a water stream at a water pressure of 3.0 MPa was sprayed once onto the surface of the second fibrous web, and then a water stream at a water pressure of 3.0 MPa was sprayed once onto the surface of the first fibrous web. The nozzle used in the hydroentanglement treatment was a nozzle with orifices with a hole diameter of 0.12 mm arranged at 0.6 mm intervals, and the distance between the nozzle and the fibrous web during treatment was 20 mm.

[0134] Next, the fiber web after the hydroentanglement treatment was dried using a hot air penetration type heat treatment machine set at 100°C, thereby obtaining a laminated nonwoven fabric of Example 1.

[0135] (Examples 2 to 12, Comparative Examples 1 to 5) The laminated nonwoven fabrics of Examples 2 to 12 and Comparative Examples 1 to 5 were obtained using the same procedures as in Example 1, except that the types and proportions of fibers constituting the first and second fiber webs, whether or not a wet-laid nonwoven fabric was used and, if so, the type thereof, and the target weight of the first and second fiber webs were as shown in Tables 1 to 3, respectively.

[0136] The nonwoven fabric was evaluated as follows. <Thickness 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 294 Pa or 1.96 kPa was applied to the nonwoven fabric.

[0137] <Strength and elongation> Tensile strength was measured in accordance with JIS L 1913:2010 6.3 using a constant-speed tension tensile tester 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 load at break (tensile strength), elongation, and stress at 10% elongation (the force required to elongate 10%) were measured. The tensile test was conducted 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 tensile strength and other properties were measured in dry (standard time, DRY) and wet (WET) conditions. The wet (WET) measurement was carried out by impregnating 100 parts by mass of a sample with 250 parts by mass of distilled water.

[0138] <Coefficient of variation> The coefficient of variation was measured using a static and dynamic friction tester (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). A 5 cm × 10 cm nonwoven fabric was prepared as a sample. The long sides of the nonwoven fabric were aligned in the MD and CD directions. A tactile contactor (manufactured by Trinity Lab Co., Ltd.) was used as the contact terminal of the tester. 100 parts by mass of the test piece were impregnated with 1,000 parts by mass of distilled water. The test piece was fixed to the measurement table of the tester (table sliding type). The contact terminal was moved back and forth twice against the surface of the test piece at a load of 30 gf, a speed of 10 mm / sec, and a distance of 30 mm. The value of the dynamic friction force after the second stroke was read, and the average of the forward and reverse values ​​was taken as the dynamic friction force (gf) of one test piece.

[0139] Each sample piece was measured three times, and the average of a total of six measurements in the MD and CD directions was used as the kinetic friction force Fk (gf) for each Example and Comparative Example. Furthermore, the coefficient of variation (variation) CV of the kinetic friction coefficient was calculated from the standard deviation σ of the kinetic friction coefficient obtained during the measurement and the above-mentioned kinetic friction force Fk according to the following formula. The coefficient of variation CV was calculated for each of the surfaces of the first fiber layer and the second fiber layer. Coefficient of variation of dynamic friction coefficient CV=σ / Fk Furthermore, the difference in the coefficient of variation between both surfaces of the nonwoven fabric was calculated from the coefficient of variation calculated for each of the surfaces of the two fiber layers.

[0140] <Bending resistance> The bending resistance of the nonwoven fabric was measured in accordance with JIS L 1913:2010 6.7.5 Handle-O-Meter Method. Specifically, the measurement was performed according to the following procedure. A sample piece measuring 20 cm in length and 20 cm in width is placed on the sample stage so that the measurement direction of the sample piece is perpendicular to the slot (gap width 10 mm).

[0141] Next, the blade of the penetrator, adjusted so that it is 8 mm below the surface of the sample stage, is lowered and the sample piece is pressed in. Measurements are taken 6.7 cm (1 / 3 of the width of the sample piece) from one of the sides, at different points on the front and back in both the longitudinal and transverse directions, and the resistance to the pressing is read. The highest value (cN) indicated by the microammeter is read as the resistance value. The resistance values ​​read for each of the four sides are calculated as the sum of the values. This operation to calculate the sum is carried out for three sample pieces taken from the same nonwoven fabric, and the average of the total values ​​is calculated to obtain the bending resistance (cN) of the sample. The bending resistance of wet samples was measured after the samples were soaked in distilled water equivalent to 500% of the sample's mass. Furthermore, when measuring wet samples, a polyethylene sheet (length: 23 cm, width: 23 cm, thickness: 0.06 mm) was placed on the sample stage, and the sample was then placed on top of that. The bending resistance of the polyethylene sheet alone was then measured, and the value measured for the sheet alone was subtracted from the value measured for the sample to determine the bending resistance of the wet sample.

[0142] <Adhesion> To determine the adhesive strength, the moisture content after 15 minutes was first determined. A 5cm x 6cm sample piece (MD x CD) was prepared, its mass was measured, and then 100 parts by mass of the sample piece was impregnated with 1000 parts by mass of distilled water. The sample piece impregnated with distilled water was placed on a metal plate adjusted to 32°C, and its mass was measured after 15 minutes. The moisture content after 15 minutes was calculated according to the following formula: Moisture content after 15 minutes (%)=[(m2-m1) / m1]×100 m1: Mass of the nonwoven fabric before impregnation with distilled water (g) m2: Mass (g) of the nonwoven fabric after 15 minutes on a metal plate at 32°C

[0143] Adhesion force was measured using a static and dynamic friction measuring instrument (Tribomaster TL201Ts, manufactured by Trinity Lab Co., Ltd.). 5 cm x 10 cm specimens were prepared from the same sample as the specimens for which the moisture content after 15 minutes was determined. The specimens were prepared with the long sides aligned in the MD and CD directions of the nonwoven fabric. Artificial skin (24 cm long x 12 cm wide, product name: BIO SKIN PLATE, manufactured and sold by Beaulux Co., Ltd.) was attached to the measuring table of the measuring instrument (sliding table type).

[0144] Based on the moisture content of each sample piece after 15 minutes, 100 parts by mass of the sample piece was impregnated with distilled water to achieve the same moisture content after 15 minutes. The short edge of the sample piece (referred to as the "clipped edge") was then clamped horizontally with the measuring machine's clip. The measurement table was moved so that only an 8 cm long x 5 cm short edge area of ​​the sample from the edge opposite the clipped edge (referred to as the "non-clipped edge") overlapped the artificial skin, and the sample was left for 15 minutes. The maximum resistance force (N) was measured when the measurement table was moved parallel to the long edge of the sample, away from the clipped edge, at a speed of 10 mm / sec. Five sample pieces were measured in each of the MD and CD directions for each example. The maximum and minimum values ​​were excluded from the measurement results for the five samples in the MD direction, and the maximum and minimum values ​​were excluded from the measurement results for the five samples in the CD direction, resulting in a total of six average values. In this example, the adhesive strength was measured on both sides of the nonwoven fabric, and the difference between them was also measured.

[0145] <Water retention rate> The nonwoven fabric was cut into a 100mm x 100mm piece in the machine direction (MD) x cross direction (CD). The mass of the nonwoven fabric was measured and then immersed in distilled water for 2 minutes. The nonwoven fabric soaked in distilled water was then hung with clothespins at three corners. After 10 minutes, the mass was measured and the water retention was calculated according to the following formula. The measurements were carried out at a temperature of 23°C and a relative humidity of 55%. 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

[0146] <Sensory test> The nonwoven fabric was cut into a size of 100 mm x 100 mm in machine direction (MD) x cross direction (CD), and the mass of the nonwoven fabric was measured. 800 parts by mass of lotion (product name: Hakujun Medicinal Whitening Lotion, manufactured by Rohto Pharmaceutical Co., Ltd.) was then impregnated with 100 parts by mass of the cut nonwoven fabric. Ten panelists touched the nonwoven fabric impregnated with lotion and comprehensively evaluated the adhesion, softness, and smoothness, assigning a score out of 5 points, and the average value was calculated.

[0147] The evaluation results of Examples 1 to 21 and Comparative Examples 1 to 5 are shown in Tables 1 to 5.

[0148] [Table 1]

[0149] [Table 2]

[0150] [Table 3]

[0151] [Table 4]

[0152] [Table 5]

[0153] All of the nonwoven fabrics in the Examples had a stress per unit basis weight in the CD at 10% elongation in a wet state of 0.009 N / 5 cm or more, a CV on both sides of the nonwoven fabric of 0.04 or less, and a difference in adhesion strength between the two sides of the nonwoven fabric of 40 gf or less. Therefore, all of these nonwoven fabrics had appropriate extensibility and showed equivalent adhesion on both sides, making it possible to provide a liquid-impregnated skin dressing sheet that could be used without distinguishing between the two surfaces (i.e., without being aware of the front and back surfaces).

[0154] In the nonwoven fabric (Comparative Example 4) in which a layer made only of cotton was integrated with a wet-laid nonwoven fabric made of pulp, the cotton and pulp were strongly entangled, resulting in a hard feel. In Examples 1 to 5 and 9 to 16, the first fiber layer did not contain cotton but contained soft, water-repellent cellulose, which is thought to have resulted in higher softness than in Comparative Example 4. In Examples 1 to 5 and 9 to 16, in which the second fiber layer was made of cotton, the difference in adhesion between the first and second fiber layers was small, and the difference in adhesion was particularly small in Examples 1, 8, and 9. This is thought to be due to the influence of the content of water-repellent cellulose fiber in the first fiber layer (50% by mass), the basis weight ratio of each layer, and the cotton in the second fiber layer.

[0155] In Examples 6 to 8 and Examples 17 to 21, in which the second fiber layer was made of rayon or lyocell, the difference in adhesion between the first and second fiber layers was also small. Furthermore, all of these Examples had low bending resistance in the wet state, were soft overall, and had a tactile feel that was less prone to unevenness due to variations in fineness. Examples 20 and 21 tended to have higher bending resistance, slightly lower softness, and slightly higher CV values ​​than Examples in which the second fiber layer was made of rayon. This is thought to be due to the high fineness of the rayon fiber used.

[0156] In Comparative Example 1, in which the first fiber layer did not contain hydrophilic cellulose, and in Comparative Examples 2 and 3, in which the intermediate fiber layer did not contain any intermediate fiber layer, the difference in adhesion between the two surfaces was large. In Comparative Example 1, the water-repellent rayon was less likely to be entangled with the intermediate fiber layer, which is thought to have contributed to the large difference in adhesion between the two surfaces. Similarly, in Comparative Example 5, in which the first fiber layer did not contain water-repellent cellulose, the difference in adhesion between the two surfaces was also large. This is thought to be because, since the first fiber layer did not contain water-repellent cellulose, the conformability was not improved on the first fiber layer side, and only the second fiber layer improved its conformability due to the influence of short pulp fibers, resulting in a high adhesion.

[0157] In Comparative Example 4, in which both the first and second fiber layers were made of cotton and the first fiber layer did not contain water-repellent cellulose fibers, the fabric had a hard texture, poor drapeability, a large CV value on the surface of the second fiber layer, a rough feel, and a low average value in the sensory test. This is thought to be due to the cotton being firmly entangled with the pulp constituting the middle fiber layer and a high fiber density caused by non-uniformity in the cotton fineness and fiber length.

[0158] The present disclosure includes the following aspects. (Aspect 1) A laminated nonwoven fabric for a liquid-impregnated skin application sheet, comprising a first fiber layer forming one surface, a second fiber layer forming the other surface, and an intermediate fiber layer located between the first fiber layer and the second fiber layer, laminated and integrated together, the first fiber layer contains, based on the total mass of the first fiber layer, 10% by mass or more and 90% by mass or less of water-repellent cellulose fibers and 10% by mass or more and 90% by mass or less of hydrophilic cellulose fibers; the second fiber layer contains hydrophilic fibers in an amount of 50% by mass or more based on the total mass of the second fiber layer; the intermediate fiber layer contains 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the intermediate fiber layer; the first fiber layer, the intermediate fiber layer, and the second fiber layer are integrated by entanglement of the fibers; Laminated nonwoven fabric for liquid-impregnated skin covering sheets. (Aspect 2) The laminated nonwoven fabric for a liquid-impregnated skin dressing sheet of Aspect 1, wherein when the second fiber layer contains water-repellent cellulose fibers, the proportion of water-repellent cellulose fibers in the first fiber layer is more than 10% by mass higher than the proportion of water-repellent cellulose fibers in the second fiber layer. (Aspect 3) 3. The laminated nonwoven fabric for a liquid-impregnated skin-covering sheet according to Aspect 1 or 2, wherein the second fibrous layer does not contain water-repellent cellulose fibers, or if it does contain water-repellent cellulose fibers, the content is less than 10% by mass. (Aspect 4) 4. The laminated nonwoven fabric for a liquid-impregnated skin-application sheet according to any one of Aspects 1 to 3, wherein the hydrophilic cellulose fibers contained in the first fibrous layer and the hydrophilic fibers contained in the second fibrous layer are different from each other. (Aspect 5) The laminated nonwoven fabric for a liquid-impregnated skin application sheet of any one of Aspects 1 to 4, wherein the degree of entanglement of fibers between the first fiber layer and the intermediate fiber layer is smaller than the degree of entanglement of fibers between the second fiber layer and the intermediate fiber layer. (Aspect 6) 6. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to any one of Aspects 1 to 5, wherein the hydrophilic fibers include hydrophilic cellulose fibers. (Aspect 7) A liquid-impregnated laminate nonwoven fabric for use in a skin application sheet according to aspect 6, comprising 70% by mass or more of cellulose fibers based on the total mass of the liquid-impregnated laminate nonwoven fabric for use in a skin application sheet. (Aspect 8) 8. The laminated nonwoven fabric for a liquid-impregnated skin-applying sheet according to any one of Aspects 1 to 7, wherein the hydrophilic fibers comprise cotton. (Aspect 9) 8. The laminated nonwoven fabric for a liquid-impregnated skin-covering sheet according to any one of Aspects 1 to 7, wherein the hydrophilic fibers comprise rayon. (Aspect 10) 10. The laminated nonwoven fabric for a liquid-impregnated skin-covering sheet according to any one of Aspects 1 to 9, wherein the intermediate fiber layer is a wetlaid nonwoven fabric. (Aspect 11) The basis weight of the liquid-impregnated laminated nonwoven fabric for skin covering sheets is 30 g / m 2 More than 120g / m 2 A liquid-impregnated laminated nonwoven fabric for a skin-covering sheet according to any one of Aspects 1 to 10, which is as follows: (Aspect 12) 12. The liquid-impregnated laminated nonwoven fabric for a skin-covering sheet according to any one of Aspects 1 to 11, wherein the skin-contacting surface may be the surface of either the first fiber layer or the second fiber layer. (Aspect 13) preparing a first fiber web containing 10% by mass or more and 90% by mass or less of water-repellent cellulose fibers and 10% by mass or more and 90% by mass or less of hydrophilic cellulose fibers, based on the total mass of the first fiber web; preparing a second fiber web containing hydrophilic fibers in an amount of 50% by mass or more based on the total mass of the second fiber web; preparing a third fiber web containing 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the third fiber web; overlapping the first fiber web, the second fiber web, and the third fiber web so that the third fiber web is positioned between the first fiber web and the second fiber web to prepare a laminated fiber web; subjecting the laminated fiber web to an entanglement treatment using a high-pressure fluid stream to entangle the fibers. A method for producing a laminated nonwoven fabric for a liquid-impregnated skin covering sheet, comprising: (Aspect 14) Aspect 14. The method for producing a laminated nonwoven fabric for a liquid-impregnated skin application sheet according to aspect 13, wherein in the entanglement treatment using a high-pressure fluid stream, the high-pressure fluid stream is a water stream, and the water stream is first sprayed onto the surface of the second fiber web, and then the water stream is sprayed onto the surface of the first fiber web. (Aspect 15) A liquid-impregnated skin application sheet obtained by impregnating 500 to 2000 parts by mass of liquid with respect to 100 parts by mass of the liquid-impregnated laminated nonwoven fabric for a skin application sheet according to any one of aspects 1 to 12. (Aspect 16) A face mask obtained by impregnating 500 to 2000 parts by mass of liquid with respect to 100 parts by mass of the liquid-impregnated laminated nonwoven fabric for a skin application sheet according to any one of Aspects 1 to 12. (Aspect 17) The liquid-impregnated laminated nonwoven fabric for a skin-covering sheet comprises: the first fiber layer contains 40% by mass or more and 60% by mass or less of water-repellent cellulose fibers and 40% by mass or more and 60% by mass or less of hydrophilic cellulose fibers; the second fiber layer contains 95% by mass or more of cotton as the hydrophilic fiber, 17. The face mask of embodiment 16, wherein the intermediate fibrous layer comprises pulp. [Industrial Applicability]

[0159] The laminated nonwoven fabric of the present disclosure comprises a first fiber layer containing water-repellent cellulose fibers and hydrophilic cellulose fibers, a second fiber layer containing hydrophilic fibers, and an intermediate fiber layer between the first and second fiber layers containing hydrophilic cellulose fibers, the first and second fiber layers exhibiting good adhesion to the skin in a wet state. Therefore, the laminated nonwoven fabric of the present disclosure is useful as a substrate for covering the skin in a liquid-impregnated state, such as a face mask.

Claims

1. A laminated nonwoven fabric for a liquid-impregnated skin application sheet, comprising a first fiber layer forming one surface, a second fiber layer forming the other surface, and an intermediate fiber layer located between the first fiber layer and the second fiber layer, laminated and integrated together, the first fiber layer contains, based on the total mass of the first fiber layer, 30% by mass or more and 90% by mass or less of water-repellent cellulose fibers having a fiber length of 30 mm or more and 75 mm or less, and 10% by mass or more and 70% by mass or less of hydrophilic cellulose fibers having a fiber length of 10 mm or more; and when the first fiber layer contains fibers other than the water-repellent cellulose fibers and the hydrophilic cellulose fibers, the proportion of such fibers is 20% by mass or less; the second fiber layer contains, based on the total mass of the second fiber layer, hydrophilic fibers having a fiber length of 10 mm or more in an amount of 50 mass % or more, and does not contain water-repellent cellulose fibers, or if it contains water-repellent cellulose fibers, the amount is less than 10 mass %; the intermediate fiber layer contains 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the intermediate fiber layer; the first fiber layer, the intermediate fiber layer, and the second fiber layer are integrated by entanglement of the fibers; Laminated nonwoven fabric for liquid-impregnated skin covering sheets.

2. A laminated nonwoven fabric for a liquid-impregnated skin covering sheet, which is formed by laminating and integrating a first fiber layer forming one surface, a second fiber layer forming the other surface, and an intermediate fiber layer located between the first fiber layer and the second fiber layer, the first fiber layer contains, based on the total mass of the first fiber layer, 10% by mass or more and 90% by mass or less of water-repellent cellulose fibers and 10% by mass or more and 90% by mass or less of hydrophilic cellulose fibers; the second fiber layer contains hydrophilic fibers in an amount of 50% by mass or more based on the total mass of the second fiber layer; the intermediate fiber layer contains 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the intermediate fiber layer; the first fiber layer, the intermediate fiber layer, and the second fiber layer are integrated by entanglement of the fibers; A laminated nonwoven fabric for a liquid-impregnated skin dressing sheet, wherein, when the second fiber layer contains water-repellent cellulose fibers, the proportion of water-repellent cellulose fibers in the first fiber layer is more than 40% by mass higher than the proportion of water-repellent cellulose fibers in the second fiber layer.

3. 3. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 2, wherein the second fibrous layer contains less than 10% by mass of water-repellent cellulose fibers.

4. 4. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the hydrophilic cellulose fibers contained in the first fibrous layer and the hydrophilic fibers contained in the second fibrous layer are different from each other.

5. 5. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the degree of entanglement of fibers between the first fiber layer and the intermediate fiber layer is smaller than the degree of entanglement of fibers between the second fiber layer and the intermediate fiber layer.

6. 6. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the hydrophilic fibers include hydrophilic cellulose fibers.

7. The first fiber layer consists only of the hydrophilic cellulose fibers and the water-repellent cellulose fibers, 7. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 6, wherein the second fibrous layer contains the hydrophilic cellulose fibers in an amount of 90% by mass or more based on the total mass of the second fibrous layer.

8. 7. The liquid-impregnated laminate nonwoven fabric for a skin application sheet according to claim 6, comprising 70% by mass or more of cellulose fibers based on the total mass of the liquid-impregnated laminate nonwoven fabric for a skin application sheet.

9. 9. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the hydrophilic fibers comprise cotton.

10. 9. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the hydrophilic fibers comprise rayon.

11. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to any one of claims 1 to 10, wherein the intermediate fiber layer is a wet-laid nonwoven fabric.

12. The basis weight of the liquid-impregnated laminated nonwoven fabric for skin covering sheets is 30 g / m ２ 120g / m or more ２ The liquid-impregnated laminated nonwoven fabric for a skin application sheet according to any one of claims 1 to 11, wherein:

13. 13. The laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 1, wherein the skin contact surface may be the surface of either the first fiber layer or the second fiber layer.

14. producing a first fiber web that is a carded web containing, based on the total mass of the first fiber web, 30% by mass or more and 90% by mass or less of water-repellent cellulose fibers having a fiber length of 30 mm or more and 75 mm or less, and 10% by mass or more and 70% by mass or less of hydrophilic cellulose fibers having a fiber length of 10 mm or more, and in the case where fibers other than the water-repellent cellulose fibers and the hydrophilic cellulose fibers are contained, the proportion of such fibers is 20% by mass or less; preparing a second fiber web that is a carded web containing 50% by mass or more of hydrophilic fibers having a fiber length of 10 mm or more, based on the total mass of the second fiber web, and not containing water-repellent cellulose fibers, or if it contains water-repellent cellulose fibers, the content of the water-repellent cellulose fibers is less than 10% by mass; preparing a third fiber web, which is a wetlaid papermaking web containing 70% by mass or more of hydrophilic cellulose fibers having a fiber length of less than 10 mm, based on the total mass of the third fiber web; overlapping the first fiber web, the second fiber web, and the third fiber web so that the third fiber web is positioned between the first fiber web and the second fiber web to prepare a laminated fiber web; subjecting the laminated fiber web to an entanglement treatment using a high-pressure fluid stream to entangle the fibers. A method for producing a laminated nonwoven fabric for a liquid-impregnated skin covering sheet, comprising:

15. 15. The method for producing a laminated nonwoven fabric for a liquid-impregnated skin application sheet according to claim 14, wherein in the entanglement treatment using the high-pressure fluid stream, the high-pressure fluid stream is a water stream, and the water stream is first sprayed onto the surface of the second fiber web, and then the water stream is sprayed onto the surface of the first fiber web.

16. A liquid-impregnated skin application sheet, obtained by impregnating 100 parts by mass of the liquid-impregnated laminated nonwoven fabric for a skin application sheet according to any one of claims 1 to 13 with a liquid in an amount of 500 parts by mass or more and 2000 parts by mass or less.

17. A face mask obtained by impregnating 500 parts by mass or more and 2000 parts by mass or less of a liquid with respect to 100 parts by mass of the liquid-impregnated laminated nonwoven fabric for a skin application sheet according to any one of claims 1 to 13.

18. The liquid-impregnated laminated nonwoven fabric for a skin-covering sheet comprises: the first fibrous layer contains 40% by mass or more and 60% by mass or less of water-repellent cellulose fibers and 40% by mass or more and 60% by mass or less of hydrophilic cellulose fibers; the second fiber layer contains 95% by mass or more of cotton as the hydrophilic fiber, 18. The face mask of claim 17, wherein the intermediate fibrous layer is made of pulp.

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