Wet sheet for skin cleaning

Abstract

To provide a wet sheet for skin cleaning that has high cleaning performance to last for a long time.SOLUTION: A wet sheet for skin cleaning 1 includes a hydrophilic fiber layer 11 predominantly composed of hydrophilic fiber and a hydrophobic fiber layer 12 predominantly composed of hydrophobic fiber and disposed adjacent to the hydrophilic fiber layer 11. The wet sheet 1 has cleaning liquid supported thereon. A mass ratio of hydrophobic fiber in the hydrophobic fiber layer 12 is higher than a mass ratio of hydrophobic fiber in the hydrophilic fiber layer 11. A ratio R2 of an oil absorption rate to a water absorption rate in the hydrophobic fiber layer 12 is higher than a ratio R1 of an oil absorption rate to a water absorption rate in the hydrophilic fiber layer 11. In the wet sheet 1, a face including the hydrophilic fiber layer 11 is used as a contact face to a skin.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a wet sheet for skin cleansing. [Background technology]

[0002] Various types of wet wipes impregnated with water-based liquids have been proposed for cleaning hard surfaces such as floors, and for wiping skin and other body parts. Patent Document 1 discloses a wet wipe comprising a fabric containing hydrophilic and hydrophobic fibers, and a disinfectant solution impregnated into the fabric, wherein the surface of the fabric has more hydrophobic fibers than hydrophilic fibers. The same document also states that this wet wipe is suitable for medical use.

[0003] Patent Document 2 discloses a cleaning sheet made of a three-layer nonwoven fabric consisting of an intermediate layer made solely of thermoplastic synthetic fibers and an outer layer located on both sides of the intermediate layer and containing cellulose fibers. The document states that this cleaning sheet can efficiently release the liquid impregnated in the sheet and transfer it to the object to be cleaned.

[0004] Patent Document 3 discloses a liquid-impregnated nonwoven fabric having 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. The document states that this nonwoven fabric allows the impregnated liquid to remain on the skin easily.

[0005] Patent Document 4 discloses a sheet in which a liquid composition having a predetermined composition is impregnated into a nonwoven fabric composed of hydrophobic fibers and hydrophilic fibers, wherein the mass ratio of hydrophobic fibers to hydrophilic fibers is (hydrophobic fibers / hydrophilic fibers) = 5 / 95 to 55 / 45. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2016-022272 [Patent Document 2] Japanese Patent Publication No. 2017-128107 [Patent Document 3] Japanese Patent Publication No. 2016-098464 [Patent Document 4] Japanese Patent Publication No. 2019-094278 [Overview of the project] [Problems that the invention aims to solve]

[0007] When attempting to remove cosmetics or dirt from the skin using a liquid-impregnated sheet, it is common practice to use a single sheet to wipe the entire area to be cleaned for convenience. Therefore, liquid-impregnated sheets are required to have both cleaning performance that captures a large amount of dirt in a single wiping operation, and performance that prevents re-contamination of the skin (durability) when wiping is performed multiple times or consecutively using the same side of the sheet. However, the technologies described in Patent Documents 1 to 4 have not considered how to achieve both of these performances, and there was room for improvement.

[0008] Therefore, the object of the present invention is to provide a wet sheet for skin cleansing that has high cleaning performance and high durability of cleaning performance. [Means for solving the problem]

[0009] This invention relates to a wet sheet for skin cleansing. Preferably, the wet sheet comprises a hydrophilic fiber layer mainly containing hydrophilic fibers and a hydrophobic fiber layer mainly containing hydrophobic fibers and arranged adjacent to the hydrophilic fiber layer. Preferably, the wet sheet is supported with a cleaning solution. In the wet sheet, it is preferable that the mass ratio of hydrophobic fibers in the hydrophobic fiber layer is higher than the mass ratio of hydrophobic fibers in the hydrophilic fiber layer. In the wet sheet, when the percentage of the mass change before and after immersing the fiber layer in the dry state to be measured in an aqueous solution containing 0.1% by mass of a nonionic surfactant for 1 minute is defined as the water absorption rate, and the percentage of the mass change before and after immersing the fiber layer in the dry state to be measured in oleic acid for 1 minute is defined as the oil absorption rate, it is preferable that the ratio R2 of the oil absorption rate to the water absorption rate in the hydrophobic fiber layer is higher than the ratio R1 of the oil absorption rate to the water absorption rate in the hydrophilic fiber layer. It is preferable that the surface of the wet sheet including the hydrophilic fiber layer is used as the contact surface with the skin.

Advantages of the Invention

[0010] According to the present invention, there is provided a wet sheet for skin cleansing with high cleansing performance and high sustainability of the cleansing performance.

Brief Description of the Drawings

[0011] [Figure 1] FIG. 1 is a cross-sectional view schematically showing the arrangement of the fiber layers constituting the wet sheet according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view schematically showing the arrangement of the fiber layers constituting the wet sheet according to another embodiment of the present invention.

Modes for Carrying Out the Invention

[0012] Hereinafter, the wet sheet for skin cleansing of the present invention (hereinafter, also simply referred to as "wet sheet") will be described based on its preferred embodiments. In the present invention, skin cleansing refers to wiping the human skin (skin surface), and includes wiping of, for example, the face, scalp, arms, legs, joints, underarms, and the like.

[0013] The wet sheet of the present invention consists of a fiber aggregate and carries a cleaning solution for cleaning the skin surface. Carrying the cleaning solution also includes the embodiment of containing the cleaning solution in the fiber aggregate and its voids. The fiber aggregate contains at least hydrophobic fibers and hydrophilic fibers. The hydrophobic and hydrophilic fibers are entangled or fused with each other, with each other, and with other hydrophobic and hydrophilic fibers to form the fiber aggregate. The wet sheet of the present invention may be the fiber aggregate itself with the cleaning solution carried on it, or it may have other components in addition to the fiber aggregate. The cleaning solution carried on the wet sheet will be described later.

[0014] The fiber aggregate that makes up a wet sheet is a fiber aggregate that is integrated by the entanglement or fusion of the constituent fibers. Here, the side of the wet sheet that cleanses the skin (hereinafter also referred to as the skin cleansing surface) is called the front surface or first surface, and the side opposite the skin cleansing surface is called the back surface or second surface.

[0015] Figure 1 schematically shows a cross-section of one embodiment of the wet sheet of the present invention. The wet sheet 1 shown in the figure is composed of a hydrophilic fiber layer 11 mainly containing hydrophilic fibers and a hydrophobic fiber layer 12 mainly containing hydrophobic fibers, and each fiber layer is integrated to form a fiber aggregate. The wet sheet 1 also has a first surface F and a second surface R located on the opposite side of the first surface F.

[0016] In this specification, "as the main component" or "being the main component" means that the fiber in question is present in more than 50% by mass in a single fiber layer. In this specification, when a droplet of pure water is dropped onto the fiber at a temperature of 25°C, a fiber whose contact angle with the water is 90 degrees or more is defined as a hydrophobic fiber, and a fiber whose contact angle with the water is less than 90 degrees is defined as a hydrophilic fiber. The contact angle can be measured, for example, according to the method described in Japanese Patent Application Publication No. 2015-142721.

[0017] The wet sheet 1 shown in Figure 1 has a hydrophilic fiber layer 11 and a hydrophobic fiber layer 12 arranged adjacent to each other. There are no other components between the fiber layers 11 and 12. Also, the wet sheet 1 shown in the figure has no other components on the first surface F and the second surface R that constitute its outer surface. For the sake of explanation, the wet sheet 1 shown in the figure is shown with the boundaries between the fiber layers 11 and 12 clearly defined, but it is not limited to this configuration, and the boundaries between the fiber layers 11 and 12 may be unclear.

[0018] In the embodiment shown in Figure 1, the first surface F of the wet sheet 1 is provided as the surface that cleanses the skin when the wet sheet is used. As shown in the figure, a hydrophilic fiber layer 11 is present on the upper side of the figure, and the hydrophilic fiber layer 11 constitutes the surface that cleanses the skin (first surface F). On the lower side of the figure, a hydrophobic fiber layer 12 is present, and the hydrophobic fiber layer 12 forms the second surface R. In other words, the wet sheet 1 in this embodiment has a two-layer structure, and the first surface F, which includes the hydrophilic fiber layer 11, is provided as the surface that cleanses the skin when the wet sheet is used.

[0019] As described above, the constituent fibers of the hydrophilic fiber layer 11 are mainly hydrophilic fibers, and the constituent fibers of the hydrophobic fiber layer 12 are mainly hydrophobic fibers. However, there is no preclude the inclusion of hydrophobic fibers in the constituent fibers of the hydrophilic fiber layer 11, or the inclusion of hydrophilic fibers in the constituent fibers of the hydrophobic fiber layer 12.

[0020] It is preferable that the wet sheet 1 is configured such that the mass ratio W2 of hydrophobic fibers contained in the hydrophobic fiber layer 12 is higher than the mass ratio W1 of hydrophobic fibers contained in the hydrophilic fiber layer 11. This configuration makes it easier to draw dirt wiped from the skin into the inside of the sheet, thereby improving cleaning performance. This configuration can be achieved by appropriately changing the fiber content when constructing each fiber layer 11, 12, for example, by using a single fiber or blending multiple fibers in the raw material fiber web.

[0021] In detail, the mass percentage W1 of hydrophobic fibers in the hydrophilic fiber layer 11 is preferably free of hydrophobic fibers. In other words, the mass percentage of hydrophobic fibers in the hydrophilic fiber layer 11 is preferably 0% by mass. This configuration allows for a smooth transfer of dirt to the hydrophobic fiber layer while minimizing dirt retention in the hydrophilic fiber layer. Furthermore, it can increase the amount of cleaning solution that can be retained, thereby improving cleaning performance.

[0022] In this specification, "non-containment" means intentionally excluding specific fibers or substances from the fiber layer, encompassing both the complete absence of unintended fibers or substances from the fiber layer and the unavoidable inclusion of unintended fibers or substances into the fiber layer. In the latter case, examples include hydrophobic fibers constituting the hydrophobic fiber layer 12 unintentionally crossing the boundary between fiber layers into the hydrophilic fiber layer 11, resulting in the unavoidable inclusion of other unintended fibers, or vice versa.

[0023] Alternatively, if the hydrophilic fiber layer 11 contains hydrophobic fibers, the mass percentage W1 of hydrophobic fibers in the hydrophilic fiber layer 11 is preferably greater than 0% by mass, more preferably 5% by mass or more, even more preferably 10% by mass or more, preferably 50% by mass or less, more preferably 45% by mass or less, and even more preferably 40% by mass or less. With this configuration, the sheet strength can be increased while maintaining the amount of cleaning solution retained in the sheet.

[0024] The mass percentage W3 of hydrophilic fibers in the hydrophilic fiber layer 11 is preferably more than 50% by mass, more preferably 55% by mass or more, and even more preferably 60% by mass or more, with 100% by mass or 100% by mass or less being practical. With this configuration, it is possible to ensure sufficient supply of the cleansing solution to the skin while maintaining the amount of cleansing solution that can be retained, thereby improving cleansing performance.

[0025] Furthermore, the mass percentage W2 of hydrophobic fibers in the hydrophobic fiber layer 12 is preferably more than 50% by mass, more preferably 55% by mass or more, even more preferably 60% by mass or more, and even more preferably 100% by mass or 100% by mass or less. In other words, it is even more preferable that the hydrophobic fiber layer 12 consists only of hydrophobic fibers and does not contain hydrophilic fibers. With this configuration, it is possible to make it easier to retain dirt wiped from the skin inside the sheet while increasing the strength of the sheet during use.

[0026] Furthermore, the mass ratio W4 of hydrophilic fibers in the hydrophobic fiber layer 12 is preferably 50% by mass or less, more preferably 45% by mass or less, and even more preferably 40% by mass or less, and even more preferably 0% by mass or 0% by mass or more. In other words, it is even more preferable that the hydrophobic fiber layer 12 consists only of hydrophobic fibers and does not contain hydrophilic fibers. With this configuration, dirt can be easily retained within the sheet, improving cleaning performance while preventing re-soiling of the skin.

[0027] One of the features of the wet sheet of the present invention is that the ratio of water absorption rate to oil absorption rate in each fiber layer is within a predetermined range. With this configuration, unlike conventional sheets, we have found that, surprisingly, even when wiping the target surface with light force, a large amount of dirt can be collected with a single wipe, resulting in high dirt collection efficiency. In addition, we have found that even when wiping multiple times using the same side of the sheet, the dirt collected on the sheet does not reattach to the wiped target surface, and high cleaning performance can be maintained without re-contamination of the surface being wiped. Furthermore, since the amount of cleaning solution released to wipe away makeup cosmetics, sebum, etc. from the surface being cleaned can be appropriately controlled, it is not necessary to change to a new wet sheet during skin cleansing, or the number of changes can be reduced.

[0028] In detail, for the hydrophilic fiber layer 11, the ratio R1 (i.e., T1 / S1) of the oil absorption rate T1 to the water absorption rate S1 is calculated based on the measured water absorption rate S1 and oil absorption rate T1, respectively. Similarly, for the hydrophobic fiber layer 12, the ratio R2 (i.e., T2 / S2) of the oil absorption rate T2 to the water absorption rate S2 is calculated based on the measured water absorption rate S2 and oil absorption rate T2, respectively. In this case, it is preferable that the ratio R2 in the hydrophobic fiber layer 12 is higher than the ratio R1 in the hydrophilic fiber layer 11. That is, the ratio of ratio R2 to ratio R1 (R2 / R1) is preferably greater than 1, more preferably 1.05 or more, even more preferably 1.10 or more, preferably 2.0 or less, more preferably 1.95 or less, and even more preferably 1.90 or less. In order to construct a wet sheet that satisfies the relationship described above, for example, when constructing each fiber layer 11, 12, the content of hydrophobic fibers and hydrophilic fibers in each fiber layer can be appropriately changed by using a single fiber in the raw material fiber web or by blending multiple fibers.

[0029] The water absorption rate and oil absorption rate mentioned above can be measured by the following methods, respectively. First, a dry fiber layer of any size is prepared as the fiber layer to be measured. The fiber layer to be measured may be, for example, a fiber assembly intended to constitute the fiber layer of a wet sheet used during manufacturing, or it may be a fiber layer separated from the other fiber layers of a wet sheet by peeling or cutting the fiber layers. When a wet sheet is used, the cleaning solution is removed from the fiber layer by drying or solid-liquid separation treatment, and the fiber layer is dried. Furthermore, whether the fiber layer to be measured is a hydrophilic or hydrophobic fiber layer can be determined, for example, by using a dry fiber layer and determining the presence or absence of hydrophilicity by measuring the contact angle as described above.

[0030] Next, the mass A1 of the dry fiber layer obtained by the method described above is measured. Then, the fiber layer is immersed in a predetermined liquid for 1 minute, and after that, the immersed fiber layer is removed and suspended for 30 seconds to remove excess liquid, thereby obtaining the fiber layer after immersion. Finally, the mass A2 of the fiber layer after immersion is measured. From these masses A1 and A2, the percentage (mass %) of the mass change before and after immersion is calculated based on the following equation (i). Percentage of mass change before and after immersion (mass%) = 100 × (mass A2 - mass A1) / mass A1 ... (i)

[0031] When an aqueous solution containing 0.1% by mass of a nonionic surfactant (e.g., Emulgen 108, manufactured by Kao Corporation) is used as the liquid to immerse the fiber layer, the percentage calculated from formula (i) above shall be referred to as "water absorption rate" (by mass) in this specification. On the other hand, when oleic acid (for example, manufactured by Fujifilm Wako Pure Chemical Industries) is used as the liquid in which the fiber layer is immersed, the percentage calculated from formula (i) above shall be referred to as the "oil absorption rate" (mass%) in this specification.

[0032] The ratio R1 in the hydrophilic fiber layer 11 is preferably 0.60 or higher, more preferably 0.70 or higher, even more preferably 0.80 or higher, preferably 1.50 or lower, more preferably 1.45 or lower, and even more preferably 1.30 or lower, provided that the relationship R2 > R1 is satisfied. With this configuration, excessive dirt retention in the hydrophilic fiber layer is suppressed, and dirt can be smoothly transferred to the hydrophobic fiber layer side.

[0033] The water absorption rate S1 in the hydrophilic fiber layer 11, as measured by the method described above, is preferably 500% by mass or more, more preferably 600% by mass or more, even more preferably 1000% by mass or more, preferably 2000% by mass or less, more preferably 1700% by mass or less, and even more preferably 1600% by mass or less. With this configuration, sufficient supply of cleansing solution to the skin can be achieved, thereby improving cleansing performance.

[0034] The oil absorption rate T1 in the hydrophilic fiber layer 11, as measured by the method described above, is preferably 400% by mass or more, more preferably 700% by mass or more, even more preferably 1000% by mass or more, preferably 2000% by mass or less, more preferably 1900% by mass or less, and even more preferably 1800% by mass or less. With this configuration, it is possible to control both the transfer of the cleansing liquid to the skin and the dirt removal performance on the sheet surface.

[0035] Furthermore, the ratio R2 in the hydrophobic fiber layer 12 is preferably 1.05 or higher, more preferably 1.06 or higher, even more preferably 1.10 or higher, preferably 2.0 or lower, more preferably 1.95 or lower, and even more preferably 1.80 or lower, provided that the relationship R2 > R1 is satisfied. This configuration makes it easier to retain the wiped dirt inside the sheet, preventing re-contamination of the skin.

[0036] The water absorption rate S2 in the hydrophobic fiber layer 12, as measured by the method described above, is preferably 200% by mass or more, more preferably 250% by mass or more, even more preferably 400% by mass or more, preferably 2500% by mass or less, more preferably 2400% by mass or less, and even more preferably 2000% by mass or less. With this configuration, it is possible to ensure sufficient supply of the cleansing solution to the skin while maintaining the amount of cleansing solution that can be retained, thereby improving cleansing performance.

[0037] The oil absorption rate T2 in the hydrophobic fiber layer 12, as measured by the method described above, is preferably 500% by mass or more, more preferably 550% by mass or more, even more preferably 700% by mass or more, preferably 3000% by mass or less, more preferably 2900% by mass or less, and even more preferably 2600% by mass or less. This configuration makes it easier to retain the wiped-off dirt inside the sheet, preventing re-contamination of the skin.

[0038] As described above, the fibers that make up the wet sheet consist of at least hydrophobic fibers and hydrophilic fibers. Examples of hydrophobic fibers used in the present invention include fibers made from various thermoplastic resins such as polyolefins, polyesters, and polyamides, as well as various metals, glass, or minerals. These raw materials can be used individually or in combination of two or more. Of these, polyolefin fibers, polyester fibers, or polyamide fibers are preferred from the viewpoint of production efficiency and reduction of skin irritation.

[0039] Examples of raw materials for polyolefin fibers include polyethylene (PE), polypropylene (PP), ethylene-propylene copolymer, polyvinyl acetate, ethylene-vinyl acetate copolymer, cyclic acetal of polyvinyl alcohol, acrylic resin (including acrylic resin and methacrylic resin), and polyvinyl chloride.

[0040] Examples of raw materials for polyester fibers include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN).

[0041] Examples of raw materials for polyamide fibers include polycondensed nylons such as nylon 6, nylon 11, and nylon 12, and co-condensed nylons such as nylon 66, nylon 610, nylon 612, nylon 6T, nylon 6I, nylon 9T, and nylon M5T.

[0042] Furthermore, fibers obtained by mixing the above-mentioned raw materials can be used as hydrophobic fibers. Examples of raw material combinations include polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate, and polyethylene / polypropylene.

[0043] Examples of the hydrophilic fibers used in the present invention include natural fibers such as wood pulp, cotton, and silk, regenerated fibers such as rayon and cuprammonium rayon, purified fibers such as lyocell, and fibers obtained by subjecting the above hydrophobic fibers to a hydrophilization treatment. These raw materials can be used alone or in combination of two or more. Among these, from the viewpoint of achieving both the production efficiency and flexibility of the wet sheet, it is preferable to include rayon fibers, and it is more preferable to mainly include rayon fibers.

[0044] Regarding the relationship of the air permeability resistance of each fiber layer 11, 12, it is preferable that the air permeability resistance P2 of the hydrophobic fiber layer 12 is higher than the air permeability resistance P1 of the hydrophilic fiber layer 11. In order to achieve this relationship, for example, it is preferable to make the fiber density in the hydrophobic fiber layer 12 higher than the fiber density in the hydrophilic fiber layer 11. With such a configuration, an effect can be obtained that the hydrophobic fiber layer 12 can easily capture and hold the dirt that has passed through the hydrophilic fiber layer 11. In order to make the air permeability resistance different from each other in each fiber layer 11, 12, for example, fibers such that the fiber layer 12 is thinner than the fiber layer 11 can be used as the constituent material, or the basis weight can be changed, or the fiber layer or the sheet can be manufactured by a method such as partially embossing the fiber layer 12.

[0045] The air permeability resistance P1 of the hydrophilic fiber layer 11 is preferably 0.003 kPa·s / m or more, more preferably 0.006 kPa·s / m or more, preferably 0.06 kPa·s / m or less, and more preferably 0.05 kPa·s / m or less, on the condition that the relationship is P1 < P2.

[0046] The air permeability resistance P2 of the hydrophobic fiber layer 12 is preferably 0.007 kPa·s / m or more, more preferably 0.009 kPa·s / m or more, preferably 0.800 kPa·s / m or less, and more preferably 0.600 kPa·s / m or less, on the condition that the relationship is P1 < P2.

[0047] Each air permeability resistance P1 and P2 is measured using an air permeability measuring instrument (KES-F8-AP1, manufactured by Kato Tech Co., Ltd.) after preparing the dry fiber layer to be measured using the same method as described above for measuring water absorption and oil absorption. The sheet to be measured is fixed so as to block the ventilation holes of the air permeability measuring instrument, and the air permeability resistance (kPa·s / m) is measured when air passes through the sheet at 25°C and 50%RH.

[0048] In relation to the fiber diameters of the fibers constituting each fiber layer 11 and 12, it is preferable that the average fiber diameter D2 of the hydrophobic fibers in the hydrophobic fiber layer 12 is smaller than the average fiber diameter D1 of the hydrophilic fibers in the hydrophilic fiber layer 11, and it is even more preferable that the average fiber diameter of the fibers constituting the hydrophobic fiber layer 12 is smaller than the average fiber diameter of the fibers constituting the hydrophilic fiber layer 11.

[0049] With this configuration, the hydrophilic fiber layer 11 that constitutes the contact surface with the skin is composed of relatively large-diameter fibers, resulting in a relatively large number of interfiber voids and a sparse structure. Therefore, it is possible to wipe away dirt such as sebum and cosmetics from the skin surface and efficiently transfer that dirt to the thickness direction of the sheet via the cleaning solution, thus preventing clogging of the sheet surface due to dirt and maintaining high cleaning performance for a long time. On the other hand, the hydrophobic fiber layer 12 is composed of relatively small-diameter fibers, resulting in a relatively small number of interfiber voids and a dense structure. Therefore, dirt that has migrated to the interior of the sheet in the thickness direction via the hydrophilic fiber layer 11 can be efficiently collected by the hydrophobic fiber layer 12 adjacent to the hydrophilic fiber layer 11. In particular, since sebum and cosmetics contain oil and have a high affinity for hydrophobic fibers, the dirt can be adsorbed and retained inside the sheet, which is advantageous in that it reduces the re-adhesion of dirt collected on the sheet to the surface being wiped.

[0050] From the viewpoint of achieving the above-mentioned effects even more significantly, the average fiber diameter D1 of the hydrophilic fibers contained in the hydrophilic fiber layer 11 is preferably 7 μm or more, more preferably 8 μm or more, even more preferably 9 μm or more, preferably 23 μm or less, more preferably 18 μm or less, and even more preferably 12 μm or less, provided that D1 > D2. The average fiber diameter D1 can be determined by identifying the hydrophilic fiber layer 11 and the hydrophilic fibers constituting the fiber layer in the wet sheet using the contact angle method described above, observing 10 of the hydrophilic fibers with a scanning electron microscope (SEM), and taking the length of the line drawn perpendicular to the longitudinal direction of the fiber as the fiber diameter, and then taking the arithmetic mean of these measured values ​​as the average fiber diameter D1.

[0051] From a similar viewpoint, it is preferable that the average fiber diameter of the fibers constituting the hydrophilic fiber layer 11 is within the range of the average fiber diameter D1 described above. In this case, the average fiber diameter can be the arithmetic mean of the fiber diameters measured by the method described above by observing 10 arbitrary fibers in the hydrophilic fiber layer 11 using SEM.

[0052] From the viewpoint of achieving the above-mentioned effects even more significantly, the average fiber diameter D2 of the hydrophobic fibers contained in the hydrophobic fiber layer 12 is preferably 0.3 μm or more, more preferably 0.5 μm or more, even more preferably 0.9 μm or more, preferably 23 μm or less, more preferably 21 μm or less, and even more preferably 19 μm or less, provided that D1 > D2. The average fiber diameter D2 can be determined by identifying the hydrophobic fiber layer 12 and the hydrophobic fibers constituting the fiber layer in the wet sheet using the contact angle method described above, and then taking the arithmetic mean of 10 measurements of the hydrophobic fibers by the SEM observation described above.

[0053] From a similar viewpoint, it is preferable that the average fiber diameter of the fibers constituting the hydrophobic fiber layer 12 is within the range of the average fiber diameter D2 described above. In this case, the average fiber diameter can be the arithmetic mean of the fiber diameters measured by the method described above by observing 10 arbitrary fibers in the hydrophobic fiber layer 12 using SEM.

[0054] The wet wipes of the present invention contain a cleansing solution. The cleansing solution is used to facilitate the removal of makeup, sebum, and other substances adhering to the skin surface. The amount of cleansing solution carried on a wet wipe is preferably 0.4 g / sheet or more, more preferably 0.6 g / sheet or more, and even more preferably 0.8 g / sheet or more, when the dimensions of the wet wipe are, for example, 100 mm x 180 mm. The upper limit of the amount of cleansing solution carried on a wet wipe is realistically 20 g / sheet or less, preferably 16 g / sheet or less, and even more preferably 14 g / sheet or less.

[0055] The cleansing solution used in wet wipes can have a composition similar to that of aqueous cleansing agents commonly used for removing makeup. Such a cleansing solution may be water alone, or it may be an aqueous solution mainly composed of water, optionally containing surfactants, alcohol, salts, vitamins, pH adjusters, humectants, preservatives, wetting agents, viscosity modifiers, fragrances, and other components.

[0056] The surfactant used in the cleansing solution may be a nonionic surfactant, an amphoteric surfactant, a cationic surfactant, or anionic surfactant. However, from the viewpoint of achieving both improved makeup removal and reduced skin irritation, it is preferable to use a nonionic surfactant such as polyethylene glycol fatty acid ester. The surfactant content in the cleansing solution can be 0.1% by mass or more and 20% by mass or less.

[0057] In particular, from the viewpoint of effectively removing makeup and sebum adhering to the skin surface, the cleansing solution used in the present invention preferably contains a makeup cleansing agent. Examples of makeup cleansing agents include aqueous solutions containing the surfactants mentioned above. In addition to surfactants, the makeup cleansing agent may optionally contain alcohol such as ethanol, pH adjusters such as citric acid, humectants such as 1,3-butylene glycol and glycerin, preservatives such as sodium benzoate, humectants, viscosity modifiers, fragrances, etc.

[0058] When the cleaning solution is supported, the thickness of the wet sheet is preferably 0.1 mm to 3.0 mm under a load of 1.96 kPa, and more preferably 0.2 mm to 2.0 mm. Setting the thickness of the wet sheet within this range ensures that the sheet has sufficient strength and improves handling during skin washing.

[0059] The above description pertains to a two-layer wet sheet (see Figure 1). Alternatively, a wet sheet with three or more layers may be used, as shown in Figure 2. The following description will primarily focus on the differences from the above-described embodiment, while similar components will be denoted by the same reference numerals and their descriptions will be omitted. Unless otherwise specified, the descriptions of the above-described embodiment apply appropriately to components that are not specifically described.

[0060] The wet sheet 1 shown in Figure 2 is a three-layer sheet in which a first hydrophilic fiber layer 11 is arranged adjacent to one side of a hydrophobic fiber layer 12, and a second hydrophilic fiber layer 11 is arranged adjacent to the other side of the hydrophobic fiber layer 12. In other words, the embodiment shown in Figure 2 is the same as the embodiment shown in Figure 1, in which a new hydrophilic fiber layer 11 is arranged adjacent to the hydrophobic fiber layer on the side of the hydrophobic fiber layer 12 where no hydrophilic fiber layer 11 is present. In other words, the first hydrophilic fiber layer 11 and the second hydrophilic fiber layer 11 are arranged adjacent to each other on both sides of the hydrophobic fiber layer 12. In the wet sheet 1 shown in Figure 2, there are no other members on the outer surface of the first hydrophilic fiber layer 11 and the outer surface of the second hydrophilic fiber layer.

[0061] In the embodiment shown in Figure 2, the first surface F, which is the outer surface of the wet sheet 1, is composed of a first hydrophilic fiber layer 11, and the second surface R is composed of a second hydrophilic fiber layer 11. With this configuration, both the first surface F and the second surface R can be used as the surface for washing the skin when using the wet sheet, eliminating the need to distinguish between the front and back sides during use, and improving the convenience and wiping area when using the wet sheet as both sides can be used for wiping. Furthermore, since multiple fiber layers can be arranged, a larger amount of cleaning liquid can be carried, which is advantageous in that high cleaning performance can be sustained even more effectively.

[0062] In the embodiment shown in Figure 2, for the sake of explanation, the first hydrophilic fiber layer 11 and the second hydrophilic fiber layer 11 are shown as having the same form. However, the composition of the constituent fibers of the first hydrophilic fiber layer and the second hydrophilic fiber layer may be the same or different. Also, in the wet sheet 1 shown in Figure 2, the boundaries of each fiber layer 11 and 12 are clearly shown, but the embodiment is not limited to this form, and the boundaries of each fiber layer 11 and 12 may be independently clear or unclear.

[0063] Of these, it is preferable that the composition of the constituent fibers in the first hydrophilic fiber layer and the second hydrophilic fiber layer are identical. With this configuration, both the first surface F and the second surface R can be used as the skin-cleansing surface when using a wet sheet, and regardless of which surface is used, high cleaning performance can be effectively achieved at the same level. "The composition of the constituent fibers is identical" means that the mass ratio of the constituent fibers that are intentionally included is the same, and the proportion of fibers that are inevitably mixed in is not relevant.

[0064] The wet wipes described above can be manufactured, for example, by the following method. First, a fiber web containing hydrophilic fibers is formed to constitute the hydrophilic fiber layer 11. Such a fiber web can be manufactured, for example, using a known carding method. The fiber web may consist only of hydrophilic fibers, or it may be manufactured by further blending hydrophobic fibers with hydrophilic fibers. The raw materials and physical properties of the hydrophilic and hydrophobic fibers can be independently and appropriately adopted from the above-described configuration.

[0065] Next, the fiber web containing hydrophilic fibers is entangled by a water flow to form a hydrophilic fiber layer 11 as an aggregate of hydrophilic fibers. This method is a fiber entanglement method generally known as the spunlace method, and the resulting hydrophilic fiber layer 11 is nonwoven.

[0066] The basis weight of the hydrophilic fiber layer is 10 g / m². 2 The above is preferable, and 12 g / m 2 The above is more preferable: 50 g / m 2 The following is preferable: 40 g / m 2 The following is more preferable. By having a range like this, it is possible to easily intertwine the fibers with each other, thereby achieving both improved release of cleaning solution in the wet wipe and improved flexibility during use. The hydrophilic fiber layer described above is, for example, a fiber web containing hydrophilic fibers manufactured to have a basis weight within the above range, subjected to a water pressure of 5 kg / cm² in water flow entanglement. 2 More than 90kg / cm 2 The following conditions must be met, and the fiber web can be manufactured by ensuring a conveying speed of 3 m / min to 80 m / min.

[0067] Subsequently, a hydrophobic fiber layer 12 as an aggregate of hydrophobic fibers is formed on the hydrophilic fiber layer 11 to obtain a laminate. As a method for forming the hydrophobic fiber layer 12, for example, using a melt of a raw material resin, hydrophobic fibers can be directly spun and deposited on the hydrophilic fiber layer 11 by a melt spinning method such as the melt blow method or the electrospinning method, and this deposit can be used as the hydrophobic fiber layer 12. Alternatively, the hydrophobic fiber layer 12 can be manufactured in another process by the melt blow method or the electrospinning method, etc., and this can be arranged on the upper surface of the hydrophilic fiber layer 11. Alternatively, a fiber web containing hydrophobic fibers can be formed, and this can be hydroentangled, or a hydrophobic fiber layer 12 made into a non-woven fabric by the spunbond method or the melt blow method can be separately prepared and arranged on the upper surface of the hydrophilic fiber layer 11.

[0068] The basis weight of the hydrophobic fiber layer 12 is preferably 5 g / m 2 or more, more preferably 10 g / m 2 or more, preferably 50 g / m 2 or less, and more preferably 40 g / m 2 or less. By being within such a range, it becomes easier to entangle the fibers, and while achieving sufficient strength of the wet sheet, the collecting property of dirt containing oil components such as sebum and cosmetics can be enhanced. A hydrophobic fiber layer having such a basis weight can be manufactured by appropriately adjusting, for example, the discharge amount of the molten resin, the temperature of the hot air, the amount of hot air blown, etc. in the melt blow method, and in the electrospinning method, it can be manufactured by appropriately adjusting the discharge amount of the molten resin, the potential difference, the spinning distance, etc. Alternatively, it can be manufactured by appropriately adjusting the basis weight of the fiber web.

[0069] As shown in FIG. 2, when manufacturing a three-layer structured sheet in which the hydrophobic fiber layer 12 is arranged between two hydrophilic fiber layers 11, 11, after forming the hydrophobic fiber layer 12 on the first hydrophilic fiber layer 11 by the above method, a second hydrophilic fiber layer 11 is further arranged on the upper surface of the hydrophobic fiber layer 12 to obtain a three-layer structured laminate. The second hydrophilic fiber layer 11 can be obtained by the same method as the method for forming the hydrophilic fiber layer 11 described above.

[0070] Next, the laminate of the hydrophilic fiber layer 11 and the hydrophobic fiber layer 12 is integrated to form a multilayer fiber assembly. The method for integrating each fiber layer can be, for example, by employing the spunlace method described above to entangle the fibers. The conditions for employing the spunlace method can be the same as those for forming the hydrophilic fiber layer described above.

[0071] Alternatively, instead of the manufacturing method described above, for example, the hydrophobic fiber layer 12 may be formed in advance using the method described above, and then a hydrophilic fiber web or hydrophilic fiber layer 11 may be directly laminated onto one side of the hydrophobic fiber layer 12 and integrated using a spunlace method or the like to form a multilayer fiber assembly having a hydrophilic fiber layer 11 and a hydrophobic fiber layer 12. To form a three-layer fiber assembly, for example, a hydrophilic fiber web or hydrophilic fiber layer 11 may be placed adjacent to the hydrophobic fiber layer 12 on one side and the other side of the hydrophobic fiber layer 12, and then integrated using a spunlace method or the like in that state.

[0072] Finally, the multilayered fiber assembly 1A is dried by known drying methods, and then a cleaning solution is supplied to the fiber assembly to support it. Through this process, the desired wet sheet is obtained. Even when the cleaning solution is supported, the layer structure and the degree of three-dimensional entanglement of the fiber assembly do not change substantially, so the average fiber diameter of the constituent fibers does not change substantially.

[0073] The wet wipes manufactured in this manner are suitable for use in cleaning human skin. For example, they can be used to cleanse the face, scalp, arms, legs, joints, and armpits of the person being cleaned. In particular, the wet wipes of the present invention have high performance in removing sebum and makeup applied to the skin surface, even when wiping the skin surface with light pressure.

[0074] Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments. For example, although the wet sheets in the above embodiments were described using a two-layer or three-layer structure as an example, there is no precluding the provision of four or more fiber layers. Furthermore, while the wet sheet described above was constructed with two or more fiber layers integrated and non-peelable from the viewpoint of improving handling and strength, the present invention is not limited to this form as long as the effects of the present invention are achieved. For example, the wet sheet may be in a state in which each fiber layer is laminated in a peelable manner. [Examples]

[0075] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to these examples. The following physical properties (water absorption rate, oil absorption rate, average fiber diameter, air permeability resistance, etc.) were measured using the method described above, unless otherwise specified. Furthermore, in the table below, for the sake of explanation, the fiber layer containing the first surface F of the sheet will be referred to as the "first fiber layer," the fiber layer containing the second surface R of the sheet will be referred to as the "third fiber layer," and the fiber layer adjacent to the first and third fiber layers will be referred to as the "second fiber layer."

[0076] [Example 1] Wet wipes for skin cleansing were manufactured using the following method. First, as a hydrophilic fiber, we used rayon fibers (100% by mass) with an average fiber diameter D1: 11.8 μm, with a basis weight of 20 g / m². 2 A hydrophilic fiber layer was obtained. Separately, an aggregate of PP fibers (100% by mass) with an average fiber diameter D2: 2.9 μm was prepared by the meltblown method, with a basis weight of 20 g / m². 2 A hydrophobic fiber layer was obtained. Subsequently, a hydrophobic fiber layer was laminated on the upper surface of the hydrophilic fiber layer described above, and another hydrophilic fiber layer described above was laminated on the upper surface of the hydrophobic fiber layer, resulting in a three-layer laminated structure in which a hydrophobic fiber layer 12 was placed between the two hydrophilic fiber layers 11, 11. This laminated structure was subjected to the spunlace method to obtain a three-layer fiber assembly in which each fiber layer was integrated. The conditions for the spunlace method were a transport speed of 10 m / min and a water pressure of 15 kg / cm². 2 , 30 kg / cm 2 and 70 kg / cm 2 A series of water streams were sequentially applied to entangle the fibers and obtain a fiber aggregate. These water streams were applied once to each side under the same conditions.

[0077] Finally, a cleaning solution was loaded onto the three-layer fiber assembly to obtain the desired skin cleansing wet sheet. In this embodiment, the first and third fiber layers, which make up the outer surface of the wet sheet, are both composed of the same hydrophilic fiber layer 11, and the second fiber layer is composed of a hydrophobic fiber layer 12. The wet wipes for skin cleansing were rectangular in shape, and the impregnation rate of the cleansing solution relative to the dry mass of the fiber aggregate was 350% by mass. The composition of the cleansing solution was an aqueous solution containing 0.1% by mass of a nonionic surfactant (Emulgen 108, manufactured by Kao Corporation).

[0078] [Example 2] As the hydrophobic fiber layer 12, an aggregate of PP fibers (100% by mass, average fiber diameter D2: 15.2 μm) prepared by the spunbond method was used, with a basis weight of 17 g / m². 2 A three-layer skin cleansing wet sheet was obtained using the same method as in Example 1, except for the aforementioned difference.

[0079] [Example 3] A three-layer skin-cleansing wet sheet was obtained in the same manner as in Example 1, except that an aggregate of PET / PE core-sheath composite fibers (100% by mass, average fiber diameter D2: 17.6 μm) prepared by the spunbond method was used as the hydrophobic fiber layer 12.

[0080] [Example 4] As the hydrophobic fiber layer 12, an aggregate of PP fibers (100% by mass, average fiber diameter D2: 11.2 μm) prepared by the spunbond-meltblown-spunbond method was used, with a basis weight of 15 g / m². 2 A three-layer skin cleansing wet sheet was obtained using the same method as in Example 1, except for the aforementioned difference.

[0081] [Example 5] As the hydrophobic fiber layer 12, an aggregate of PET fibers (100% by mass, average fiber diameter D2: 11.5 μm) prepared by the spunlace method was used, with a basis weight of 20 g / m². 2 A three-layer skin cleansing wet sheet was obtained using the same method as in Example 1, except for the aforementioned difference.

[0082] [Example 6] As the hydrophobic fiber layer 12, an aggregate of PP fibers (100% by mass, average fiber diameter D2: 1.5 μm) produced by the electrospinning method was used, with a basis weight of 10 g / m². 2 A three-layer skin cleansing wet sheet was obtained using the same method as in Example 1, except for the aforementioned difference.

[0083] [Example 7] For each hydrophilic fiber layer 11, 11, a mixture of rayon fibers and PET fibers in a mass ratio of 7:3 was used, and this mixture was entangled using the spunlace method. The basis weight of each hydrophilic fiber layer was 20 g / m². 2 The average fiber diameter D1 of the rayon fibers was 11.8 μm, and the average fiber diameter of all fibers constituting the hydrophilic fiber layer was 11.7 μm. Aside from this, a three-layer skin cleansing wet sheet was obtained using the same method as in Example 1.

[0084] [Example 8] Each hydrophilic fiber layer was made by blending rayon fibers and PP / PE composite fibers in a mass ratio of 8:2, and then entangled them using the spunlace method. The basis weight of each hydrophilic fiber layer was 30 g / m². 2The average fiber diameter D1 of the rayon fibers was 11.8 μm, and the average fiber diameter of all fibers constituting the hydrophilic fiber layer was 12.1 μm. Aside from this, a three-layer skin cleansing wet sheet was obtained using the same method as in Example 1.

[0085] [Comparative Example 1] A three-layer skin-cleansing wet sheet was obtained using the same method as in Example 1, except that a hydrophobic fiber layer was not used, and three hydrophilic fiber layers prepared in Example 1 were laminated and integrated by the spunlace method. In this comparative example, the first to third fiber layers are all composed of hydrophilic fiber layers.

[0086] [Comparative Example 2] Instead of using a hydrophobic fiber layer, a hydrophilic fiber layer 11 is created by blending rayon fibers and PET / PE composite fibers in a mass ratio of 6:4, and then entangled using the spunlace method (basis weight: 30g / m²). 2 ) was used. A three-layer wet sheet for skin cleansing was obtained in the same manner as in Example 1, except that three layers of this hydrophilic fiber layer were laminated and integrated by the spunlace method. The first to third fiber layers of this comparative example are all composed of hydrophilic fiber layers.

[0087] [Comparative Example 3] In Example 5, the hydrophilic fiber layer 11 and hydrophobic fiber layer 12 used were laminated with the hydrophilic fiber layer 11 on the upper surface of the hydrophobic fiber layer 12, and the hydrophobic fiber layer 12 was further laminated on the upper surface of the hydrophilic fiber layer 11, resulting in a three-layer laminate structure in which the hydrophilic fiber layer 11 was placed between the two hydrophobic fiber layers 12, 12. Except for integrating this by the spunlace method, a three-layer wet sheet for skin cleansing was obtained in the same manner as in Example 1. In this comparative example, the outer surface of the wet sheet is composed of the same hydrophobic fiber layer 12 for both the first and third fiber layers, and the second fiber layer is composed of the hydrophilic fiber layer 11.

[0088] [Comparative Example 4] In Example 3, the hydrophilic fiber layer 11 and hydrophobic fiber layer 12 used were modified to form a three-layer laminate in which the hydrophilic fiber layer 11 was placed between two hydrophobic fiber layers 12, 12. A three-layer wet sheet for skin cleansing was obtained in the same manner as in Example 1, except that it was integrated using the spunlace method. In this comparative example, the outer surface of the wet sheet is composed of the same hydrophobic fiber layer 12 for both the first and third fiber layers, and the second fiber layer is composed of the hydrophilic fiber layer 11.

[0089] [Comparative Example 5] Instead of using a hydrophilic fiber layer, the hydrophobic fiber layer 12 prepared in Example 6 was used. Separately, a second hydrophobic fiber layer (basis weight: 60 g / m²) was prepared by blending PET fibers:PET / PE composite fibers:rayon fibers in a mass ratio of 7:2:1 and entangling them using the spunlace method. 2 ) was created. A three-layer wet sheet for skin cleansing was obtained in the same manner as in Example 1, except that a second hydrophobic fiber layer was laminated on top of the hydrophobic fiber layer created in Example 6, and another hydrophobic fiber layer created in Example 6 was placed on top of the second hydrophobic fiber layer to form a three-layer laminate, which was then integrated by the spunlace method. In this comparative example, the outer surface of the wet sheet is composed of the same hydrophobic fiber layer 12 for both the first and third fiber layers, and the second fiber layer is composed of a hydrophilic fiber layer 11.

[0090] [Water absorption rate, oil absorption rate, and their ratio for each fiber layer] The water absorption rates S1 and S2, oil absorption rates T1 and T2, and their ratios R1 and R2 for each fiber layer were measured and calculated using the method described above. The results are shown in Tables 1 and 2 below.

[0091] [Evaluation of cleaning performance] The wet wipes for skin cleansing in the examples and comparative examples were evaluated using synthetic leather fabric (color: off-white, manufactured by Ishino Interactive Co., Ltd.) according to the following <Evaluation Procedure for Cleaning Performance>. The results are shown in Tables 1 and 2 below.

[0092] <Evaluation procedure for cleaning performance> (1) The color difference C0 of the synthetic leather fabric itself was measured using a colorimeter (Konica Minolta CR-210) according to the L*a*b* color system. (2) 15 mg of model sebum was evenly applied to a 55 mm square area of ​​the synthetic leather fabric using a cotton swab. Five such application areas were formed on each piece of synthetic leather fabric. (3) The surface on which the model's sebum was applied was dried with warm and cold air for 3 minutes. (4) The color difference C1 of the synthetic leather fabric on the surface coated with model sebum was measured in the same manner as in procedure (1) above. (5) With a load of 5N applied to the skin cleansing wet sheets of the examples and comparative examples, the sheet was moved back and forth six times over one area where the model sebum was applied to clean the surface of the model sebum. (6) Without changing the surface of the sheet, the wiping operation described in (5) was sequentially performed on other areas where the model sebum had been applied. (7) In each coated area after wiping, the color difference C2 of the synthetic leather fabric was measured in the same manner as in procedure (1) above. (8) The cleaning rate (%) was calculated from the following <Formula A>, and the cleaning performance was evaluated according to the following <Evaluation Criteria>. In Tables 1 and 2, the "initial" cleaning performance is based on the cleaning rate of the area when the first model sebum application area is wiped, and the "final" cleaning performance is based on the cleaning rate of the fifth model sebum application area after all five model sebum application areas have been wiped consecutively. Furthermore, a higher cleaning rate indicates better cleaning performance.

[0093] <Formula A> Cleaning rate (%) = ((Color difference C2) - (Color difference C1)) / ((Color difference C0) - (Color difference C1))

[0094] The composition of the model sebum was as follows: Squalene: 8.82% by mass • Myristyl myristate: 23.52% by mass ·Cottonseed oil: 46.06% by mass • Cholesterol: 1.96% by mass • Cholesteryl palmitate: 1.96% by mass • Lauric acid: 0.196% by mass • Myristic acid: 2.45% by mass Palmitic acid: 5.88% by mass • Stearic acid: 0.882% by mass • Oleic acid: 6.272% by mass • Carbon black powder: 2.0% by mass

[0095] <Evaluation Criteria for Cleaning Performance> A: It has a cleaning rate of 70% or more, possesses high cleaning performance, and also has excellent durability in maintaining cleaning performance. B: The cleaning rate is between 50% and 70%, it has satisfactory cleaning performance, and the cleaning performance is sustainable. C: The cleaning rate is less than 50%, indicating poor cleaning performance or lack of sustained cleaning performance.

[0096] [Table 1]

[0097] [Table 2]

[0098] The wet wipes in the examples exhibit improved cleaning performance compared to the wet wipes in the comparative examples. In particular, high cleaning performance is maintained even after continuously wiping dirt on the same surface, and no re-adhesion of dirt is observed. This indicates that the wet wipes in the examples effectively remove a large amount of dirt, demonstrating a very high dirt-removing effect. Furthermore, even during continuous use, they have a high dirt collection capacity, preventing re-contamination of dirt that has been wiped away. [Explanation of symbols]

[0099] 1. Wet wipes for skin cleansing 11 Hydrophilic fiber layer 12 Hydrophobic fiber layer Page F, Page 1 R, Page 2

Claims

1. A wet sheet for cleansing skin, comprising a hydrophilic fiber layer mainly containing hydrophilic fibers, and a hydrophobic fiber layer mainly containing hydrophobic fibers and disposed adjacent to the hydrophilic fiber layer, and holding a cleansing liquid therein, a mass ratio of the hydrophobic fibers in the hydrophobic fiber layer is higher than a mass ratio of the hydrophobic fibers in the hydrophilic fiber layer; The fiber layer in a dry state to be measured is immersed in an aqueous solution containing 0.1% by mass of a nonionic surfactant for 1 minute, and the percentage of change in mass is defined as the water absorption rate. The oil absorption rate is defined as the percentage of mass change before and after immersing the dry fiber layer to be measured in oleic acid for 1 minute. a ratio R2 of the oil absorption rate to the water absorption rate in the hydrophobic fiber layer is higher than a ratio R1 of the oil absorption rate to the water absorption rate in the hydrophilic fiber layer; The surface of the wet sheet for cleansing skin, which surface includes the hydrophilic fiber layer, is used as a surface that comes into contact with the skin.

2. The hydrophilic fiber layers are disposed adjacent to both sides of the hydrophobic fiber layer, 2. The skin cleansing wet sheet according to claim 1, wherein the composition of the constituent fibers in each of said hydrophilic fiber layers is the same as each other.

3. 3. The skin cleansing wet sheet according to claim 1, wherein the hydrophobic fiber layer is made of the hydrophobic fiber alone.

4. The skin cleansing wet sheet according to any one of claims 1 to 3, wherein the hydrophilic fiber layer does not contain hydrophobic fibers.

5. The skin cleansing wet sheet according to any one of claims 1 to 3, wherein the hydrophilic fiber layer contains hydrophobic fibers, and the content of the hydrophobic fibers is more than 0 mass % and 45 mass % or less.

6. The skin cleansing wet sheet according to any one of claims 1 to 5, wherein the ratio R2 is 1.05 or more and 3.0 or less.

7. The skin cleansing wet sheet according to any one of claims 1 to 6, wherein the ratio R1 is 0.50 or more and 1.50 or less.

8. The skin cleansing wet sheet according to any one of claims 1 to 7, wherein the cleaning liquid contains a cosmetic cleansing agent.

9. The skin cleansing wet sheet according to any one of claims 1 to 8, wherein the hydrophobic fiber layer has a higher air flow resistance than the hydrophilic fiber layer.

10. The skin cleansing wet sheet according to any one of claims 1 to 9, wherein an average fiber diameter of the hydrophobic fibers in the hydrophobic fiber layer is smaller than an average fiber diameter of the hydrophilic fibers in the hydrophilic fiber layer.

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