FACIAL CLEANSING TOWELS

Abstract

Facial cleansing cloths (1) have a lengthwise and widthwise orientation and consist of a non-woven fabric with interwoven fibers. The non-woven fabric has a single-layer structure and contains a moisture-retaining agent. The average value of the surface friction coefficient in each lengthwise and widthwise orientation is 0.18 or less.

Description

Facial cleansing sheets

[0001] The present invention relates to a facial cleansing sheet.

[0002] Conventionally, sheet members such as nonwoven fabrics and tissues have been known that have improved flexibility and moisture retention to make them suitable for use when washing the face, etc. For example, Patent Document 1 discloses a technology relating to tissue paper that has a three-ply or four-ply laminated structure in which a moisture-retaining material is applied to each layer, thereby ensuring the required softness while reducing stickiness on the outer surface.

[0003] JP 2022-61414 A

[0004] In a sheet member having a laminated structure having multiple plies (layers) as in Patent Document 1, when used for washing the face, the layers may easily peel off from each other, resulting in insufficient overall strength. On the other hand, when trying to increase the strength of conventional sheet members, it has generally resulted in insufficient flexibility. Furthermore, it has been difficult to achieve a balanced increase in moisturizing properties in addition to strength and flexibility so as to be suitable for use when washing the face.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a facial cleansing sheet having improved strength, flexibility, and moisture retention.

[0006] The main invention for achieving the above object is a facial cleansing sheet made of a nonwoven fabric having a vertical direction and a horizontal direction perpendicular to each other and in which a plurality of fibers are entangled, wherein the nonwoven fabric has a single-layer structure and contains a moisturizing agent, and the average values ​​of the surface friction coefficients in both the vertical direction and the horizontal direction are 0.18 or less.

[0007] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0008] According to the present invention, a facial cleansing sheet having improved strength, flexibility, and moisture retention can be provided.

[0009] 6A and 6B are diagrams illustrating a method for measuring the bending length of the facial cleansing sheet 1. FIG. 7A to FIG. 7C are diagrams illustrating the state when the facial cleansing sheet 1 is pulled in the longitudinal direction (MD direction) and the transverse direction (CD direction). FIG. 8A and FIG. 8B are images of the facial cleansing sheet 1 in the state shown in FIG. 7C.

[0010] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0011] (Aspect 1) A facial cleansing sheet made of a nonwoven fabric having a longitudinal direction and a transverse direction perpendicular to each other and in which a plurality of fibers are entangled, wherein the nonwoven fabric has a single-layer structure and contains a moisturizing agent, and the average values ​​of the surface friction coefficients in both the longitudinal direction and the transverse direction are 0.18 or less.

[0012] According to the facial cleansing sheet of Aspect 1, by being composed of a single-layer nonwoven fabric, delamination and the like are less likely to occur when wiping the face, and strength is easily ensured. Furthermore, the inclusion of a moisturizing agent enhances moisturizing properties, and by making it easier to retain moisture, flexibility is easily maintained. Furthermore, by setting the surface friction coefficient (average value) to 0.18 or less, the sheet feels smoother against the skin when placed against the face than in the opposite case, making it easier for the user to feel soft. This makes it possible to provide a facial cleansing sheet with improved strength, flexibility, and moisturizing properties.

[0013] (Aspect 2) The facial cleansing sheet according to aspect 1, having a basis weight of 73 gsm or more and a bending resistance of 2.5 cm or less in both the machine direction and the cross direction.

[0014] According to the facial cleansing sheet of aspect 2, it is possible to ensure strength and flexibility sufficient for use as a facial cleansing sheet.

[0015] (Aspect 3) The facial cleansing sheet according to aspect 1 or 2, wherein the fiber orientation of the fibers constituting the nonwoven fabric is different between one side and the other side in the thickness direction.

[0016] According to the facial cleansing sheet of Aspect 3, the probability that fibers with different orientations will intersect with each other increases, and the number of fiber entanglement sites increases during the production of the nonwoven fabric, which tends to increase the strength of the nonwoven fabric as a whole. Furthermore, because the fiber orientation differs between one side and the other side in the thickness direction, the entire nonwoven fabric is more likely to undergo three-dimensional bending and deformation, and when used for washing the face, etc., the nonwoven fabric can freely deform in accordance with the unevenness of the user's skin, improving the feel against the skin.

[0017] (Aspect 4) The facial cleansing sheet according to any one of Aspects 1 to 3, wherein the amount of the moisturizing agent applied to the nonwoven fabric is 4.8% or more and 11% or less.

[0018] According to the facial cleansing sheet of Aspect 4, if the coating amount of moisturizing agent is less than 4.8%, the coefficient of surface friction becomes large, the stiffness becomes high, and the feel on the skin tends to deteriorate. On the other hand, if the coating amount of moisturizing agent is more than 11%, the sheet surface becomes heavily frayed, the feel on the skin and strength of the sheet member tend to decrease, and the water repellency increases and the water absorption rate tends to decrease. Therefore, by setting the coating amount of moisturizing agent to 4.8% or more and 11% or less, it is easier to achieve good feel on the skin and water absorbency (water retention) while maintaining sufficient strength, compared to the opposite case.

[0019] (Aspect 5) The facial cleansing sheet according to any one of Aspects 1 to 4, wherein the fibers constituting the nonwoven fabric are mainly made of hydrophilic naturally occurring materials.

[0020] According to the facial cleansing sheet of Aspect 5, fibers made primarily from hydrophilic naturally-derived materials tend to have higher water absorption properties than fibers made from petroleum-derived materials, etc., and therefore can be used to produce a sheet with good moisture retention and water absorption properties. Furthermore, the absorbed moisture helps to maintain the flexibility of the nonwoven fabric, making it suitable for use on sensitive skin and ideal as a facial cleansing sheet.

[0021] (Aspect 6) The facial cleansing sheet according to any one of aspects 1 to 5, wherein the tensile strength in each of the longitudinal direction and the transverse direction is 30 N or more.

[0022] According to the facial cleansing sheet of Aspect 6, the inclusion of a liquid such as a moisturizer ensures flexibility and moisture retention, while at the same time providing sufficient strength (30 N / 50 mm or more) to withstand use for at least face washing, thereby achieving a facial cleansing sheet that is tear-resistant while maintaining moisture retention and flexibility.

[0023] (Aspect 7) The facial cleansing sheet according to any one of Aspects 1 to 6, which has a grade of 3 or higher in accordance with GB / T4802.1-2008.

[0024] According to the facial cleansing sheet of aspect 7, excessive fluffing on the surface of the sheet is suppressed, and a facial cleansing sheet that is smooth to the touch and not too weak in strength can be realized, making it more suitable for use when washing the face.

[0025] (Aspect 8) The facial cleansing sheet according to any one of Aspects 1 to 7, wherein the nonwoven fabric contains at least one of hyaluronic acid and centella.

[0026] According to the facial cleansing sheet of Aspect 8, by including hydrolyzed hyaluronic acid and centella, which function as moisturizers and anti-evaporation agents, it is possible to easily exert skin-beautifying effects such as suppressing dryness of the skin and imparting elasticity, etc. Therefore, it is possible to realize a facial cleansing sheet that not only provides a pleasant feel to the skin when washing the face, but also allows for skin care.

[0027] (Aspect 9) The facial cleansing sheet according to any one of Aspects 1 to 8, wherein the fiber orientation of the fibers constituting the nonwoven fabric is different between one side and the other side in the thickness direction.

[0028] According to the facial cleansing sheet of Aspect 9, the probability that fibers with different orientations will cross each other increases, increasing the number of fiber entanglement points, which tends to increase the strength of the nonwoven fabric as a whole. Furthermore, because the fiber orientation differs between one side and the other side in the thickness direction, differences in the direction in which the nonwoven fabric tends to bend along the fibers tend to occur, making the entire nonwoven fabric prone to three-dimensional bending and deformation. Therefore, when used for washing the face, etc., the nonwoven fabric can freely deform according to the unevenness of the user's skin, improving the feel on the skin.

[0029] (Aspect 10) The facial cleansing sheet according to any one of Aspects 1 to 9, wherein the number of protrusions and recesses per unit area formed on the surface of the facial cleansing sheet when pulled in the vertical direction and the height of the protrusions and recesses are different from the number of protrusions and recesses per unit area formed on the surface of the facial cleansing sheet when pulled in the horizontal direction and the height of the protrusions and recesses.

[0030] According to the face wash sheet of aspect 10, pulling the sheet in any direction forms unevenness (wrinkles) on the surface, which makes it easier to wipe off water droplets, sebum, etc. that have adhered to the skin, making it a sheet member that is more suitable for use when washing the face.

[0031] (Aspect 11) A facial cleansing sheet made of a nonwoven fabric having a longitudinal direction and a transverse direction perpendicular to each other and in which a plurality of fibers are entangled, wherein the nonwoven fabric has a single-layer structure and contains a moisturizing agent, and wherein when the facial cleansing sheet is pulled in either the longitudinal direction or the transverse direction, the number of protrusions and recesses per unit area formed on one side surface in the thickness direction of the facial cleansing sheet and the height of the protrusions and recesses are different from the number of protrusions and recesses per unit area formed on the other side surface in the thickness direction of the facial cleansing sheet and the height of the protrusions and recesses.

[0032] According to the facial cleansing sheet of Aspect 11, the size of the irregularities makes it easy to distinguish between the front and back, allowing the user to efficiently use both sides of the facial cleansing sheet when washing their face. Furthermore, the facial cleansing sheet can be used in a variety of ways, such as by wiping away moisture and sebum with the side with larger irregularities and gently wiping the skin with the side with smaller irregularities.

[0033] (Aspect 12) A facial cleansing sheet according to Aspect 11, wherein the fiber orientation of the fibers constituting the nonwoven fabric is different on one side and the other side in the thickness direction, and when pulled in the horizontal direction, the angle between the fiber orientation direction and the vertical direction on the side where the number of irregularities per unit area and the height of the irregularities are greater is smaller than the angle between the fiber orientation direction and the vertical direction on the side where the number of irregularities per unit area and the height of the irregularities are smaller.

[0034] According to the facial cleansing sheet of aspect 12, after washing the face and removing the sheet for the first wiping, the sheet can be pulled to create irregularities (wrinkles) on one side, allowing the irregularities (wrinkles) of the sheet to gently contact the skin in areas that could not be absorbed when wiping on a smooth, wrinkle-free surface, providing a feeling of sufficient wiping and a gentle wiping sensation with just one sheet. This allows the user to easily use the facial cleansing sheet in a variety of ways.

[0035] (Aspect 13) The facial cleansing sheet according to Aspect 11 or 12, wherein when the nonwoven fabric is pulled in a direction along the fiber orientation direction of the fibers constituting the nonwoven fabric, the unevenness is not formed and the sheet remains smooth.

[0036] According to the facial cleansing sheet of aspect 13, the facial cleansing sheet 1 can be used when it is desired to use it on a smooth surface (when wiping areas of the face with few bumps) or when it is desired to use it on a surface with unevenness (when wiping areas of the face with many bumps).

[0037] Embodiments Hereinafter, an embodiment of the present invention will be described using a facial cleansing sheet 1 as an example of a sheet member suitable for use when washing the face. However, the facial cleansing sheet 1 according to the present invention can also be used for purposes other than face washing (for example, makeup, skin care, etc.).

[0038] <Basic Structure of Facial Cleansing Sheet 1> Fig. 1 is a perspective view of the facial cleansing sheet 1. As shown in Fig. 1, the facial cleansing sheet 1 is a rectangular sheet member, and has a "longitudinal direction" (corresponding to the "MD direction" described below), a "lateral direction" (corresponding to the "CD direction" described below), and a "thickness direction" that are perpendicular to each other. In this embodiment, the dimensions of the facial cleansing sheet 1 are approximately 200 mm in the longitudinal direction, 220 mm in the lateral direction, and 0.5 mm in the thickness direction. However, each dimension can be changed as appropriate, and the shape of the sheet member is not limited to a rectangular shape.

[0039] The facial cleansing sheet 1 is a dry sheet member formed by applying a predetermined liquid to a nonwoven fabric substrate and then drying it. Because it is a dry sheet rather than a wet one, it is suitable for wiping away moisture when the body becomes wet after washing the face, etc. Furthermore, wiping with an unsanitary towel or the like after washing the face can be avoided, keeping the skin cleaner. However, since it is dry before wiping but becomes wet during use, a certain degree of strength is required. While its primary use is wiping after washing the face, it can also be used for wiping hands and mouths, etc. Then, multiple facial cleansing sheets 1 are stacked in a folded state (e.g., folded in half) and packaged in a predetermined packaging material such as a resin sheet, to be distributed on the market as a package (not shown).

[0040] The substrate constituting the facial cleansing sheet 1 is a single-layer nonwoven fabric in which a large number of fibers are entangled, and for example, a spunlace nonwoven fabric is used. The fibers used in the nonwoven fabric are mainly hydrophilic fibers made from naturally occurring materials, and for example, naturally occurring fibers such as fibrous cellulose of cotton, silk, and hemp can be used, and more preferably, semi-synthetic fibers such as rayon fiber and lyocell can be used. As will be described in detail later, the nonwoven fabric (substrate) used in the facial cleansing sheet 1 of this embodiment has fiber orientation in two or more directions. In other words, the fibers constituting the nonwoven fabric are arranged in at least two or more directions. Note that "fiber orientation" refers to the typical orientation direction of the fibers constituting the nonwoven fabric.

[0041] The term "single-layer structure" refers to a structure in which layers cannot be separated, unlike, for example, a structure in which multiple stacked sheets can be separated from one another, such as tissue paper. In this embodiment, a spunlace nonwoven fabric formed by entangling fibers in a web with a high-pressure water jet (described later) is used as the substrate. Therefore, the structure is such that the entangled fibers cannot be peeled off to separate into two or more layers, or the layers cannot be peeled off in the thickness direction.

[0042] In this embodiment, one or more moisturizing and softening ingredients, such as glycerin, sorbitol, and polyquaternium, are mixed and added to water (HO) as a solvent, and a liquid (medicinal solution) containing one or more skin-beautifying ingredients (skin care ingredients), such as hyaluronic acid and centella, is applied to the nonwoven fabric substrate. The application and drying of the liquid containing these ingredients improves the flexibility and moisturizing properties of the nonwoven fabric substrate. Since all of these ingredients function as moisturizers, they are referred to as moisturizers in the broad sense in this specification. Furthermore, the function of each ingredient is not limited to one type; for example, polyquaternium acts as both a moisturizing agent and a softening agent, and hyaluronic acid acts as both a softening agent and a skin-beautifying ingredient.

[0043] By including such a liquid, the flexibility and moisture retention of the nonwoven fabric substrate can be improved, making it smooth to the touch when in use (when washing the face), while meeting the needs of users who place importance on skin care. However, as long as the liquid contains a moisturizer, softener, and skin-beautifying / skin care component in the solvent, the components are not limited to those described above, and the types and amounts of components included in the liquid may be changed as appropriate.

[0044] <Method for manufacturing the facial cleansing sheet 1> Next, an outline of the method for manufacturing the facial cleansing sheet 1 will be described. Fig. 2 is a flow diagram showing the method for manufacturing the facial cleansing sheet 1. When manufacturing the facial cleansing sheet 1, first, a nonwoven fabric forming step is carried out to form a nonwoven fabric that serves as a base material (S101).

[0045] FIG. 3 is a diagram illustrating a nonwoven fabric manufacturing apparatus 100 that forms a nonwoven fabric that serves as the substrate of the facial cleansing sheet 1. The nonwoven fabric manufacturing apparatus 100 includes a conveying mechanism 105, a carding mechanism 110, a high-pressure water flow mechanism 120, a drying mechanism 130, and a winding mechanism 140. The nonwoven fabric manufacturing apparatus 100 forms a planar web made of raw material fibers, and forms a nonwoven fabric (substrate) by conveying the web in a predetermined conveying direction using a conveying mechanism 105 such as a belt conveyor. Hereinafter, the conveying direction in which the web is conveyed will also be referred to as the "MD direction," and the direction perpendicular to the conveying direction on a horizontal plane (the depth direction of the paper in FIG. 3) will also be referred to as the "CD direction." The MD direction corresponds to the vertical direction in FIG. 1, and the CD direction corresponds to the horizontal direction in FIG. 1.

[0046] When manufacturing a nonwoven fabric, raw cotton (here, 100% rayon raw cotton) that will serve as the raw material for the nonwoven fabric is first fed into a carding mechanism 110. The carding mechanism 110 loosens the clumps of raw cotton to homogenize the fibers, and then passes the clumps through multiple rolls to form a sheet (flat shape). In FIG. 3, two types of carding mechanisms are provided as the carding mechanism 110: a cross-web carding mechanism 110A and a parallel-web carding mechanism 110B. The cross-web carding mechanism 110A is a so-called cross-wrapper mechanism that continuously forms a web having fiber orientation in a direction inclined relative to the MD. The parallel-web carding mechanism 110B is a mechanism that continuously forms a web having fiber orientation along the MD.

[0047] In this embodiment, raw cotton is fed into the cross-web carding mechanism 110A and the parallel-web carding mechanism 110B, respectively, to form two types of webs. The cross-web 10c formed by the cross-web carding mechanism 110A has fibers arranged in a direction obliquely intersecting the MD direction (sine curve in FIG. 3 ). On the other hand, the parallel-web 10s formed by the parallel-web carding mechanism 110B has fibers arranged in a direction parallel to the MD direction. When comparing the basis weights of the cross-web 10c and the parallel webs 10s, it is preferable that the basis weight of the parallel web 10s be relatively smaller. The formed continuum of the cross-web 10c and the parallel webs 10s is transported downstream in the MD direction by the transport mechanism 105.

[0048] The continuous bodies of the cross web 10c and the parallel web 10s are stacked in the thickness direction while being transported downstream in the MD direction, and then supplied to the high-pressure water flow mechanism 120. The high-pressure water flow mechanism 120 then sprays high-pressure water in the thickness direction, entangling the fibers under the pressure of the sprayed water flow to form a sheet-like nonwoven fabric. In this embodiment, the parallel webs 10s and the cross web 10c are stacked in the thickness direction, and the fibers are entangled and integrated to form a continuous single-layer nonwoven fabric sheet 10a. The nonwoven fabric sheet 10a thus formed has a single-layer structure, but has different fiber orientations on one side and the other side in the thickness direction. In the case of Figure 3, the nonwoven fabric has fiber orientation oblique to the MD on one side in the thickness direction and fiber orientation along the MD on the other side in the thickness direction.

[0049] Next, the nonwoven fabric sheet 10a is conveyed downstream in the MD direction and supplied to the drying mechanism 130. In the drying mechanism 130, the moisture contained in the nonwoven fabric sheet 10a is removed and the nonwoven fabric sheet is dried to form a stable sheet-like nonwoven fabric.

[0050] Finally, the nonwoven fabric sheet 10a, which is continuous in the MD direction, is wound into a roll by the winding mechanism 140. Note that if the nonwoven fabric formation step (S101) and the subsequent liquid application step (S102) in Fig. 2 are performed on the same line, winding by the winding mechanism 140 is not necessarily required.

[0051] 2 , after the nonwoven fabric substrate is formed in the nonwoven fabric formation step (S101), a liquid application step (S102) is performed to apply (coat) a liquid to the nonwoven fabric (substrate). In the liquid application step, the liquid described above is sprayed in the thickness direction from a spray device (not shown) installed at a predetermined position in the MD direction onto a continuous nonwoven fabric sheet 10a that is unwound from a roll of nonwoven fabric sheet 10a and transported in the MD direction (transport direction). As a result, the liquid containing a moisturizer and / or softener is applied (coated) over the entire continuous nonwoven fabric sheet 10a.

[0052] The continuous nonwoven fabric sheet 10a to which the liquid has been applied is dried while being transported in the MD direction, and then subjected to a cutting process in which the continuous nonwoven fabric sheet 10a is cut to a predetermined size in the MD direction (S103). In the cutting process, the continuous nonwoven fabric sheet 10a is cut at predetermined intervals in the MD direction (for example, at intervals of 200 mm) using a cutter device (not shown) installed at a predetermined position in the MD direction, to produce individual facial cleansing wipes 1.

[0053] The facial cleansing sheet 1 cut to a specified size is folded in the MD or CD direction (S104), and multiple sheets are packaged in a specified packaging material (not shown) (S105), and the packaged facial cleansing sheet 1 is shipped and distributed to the market.

[0054] <Functional Evaluation of Facial Cleansing Sheet 1> Next, specific functions of the facial cleansing sheet 1 according to this embodiment will be described. FIG. 4 is a table illustrating functional evaluation data for the facial cleansing sheet 1. FIG. 4 shows the results of measurements of the surface friction coefficient, bending length, tensile strength, and fuzz grade for six types of samples A to F, each of which has a different amount (%) of moisturizing agent applied to a substrate (nonwoven fabric) equivalent to the substrate (nonwoven fabric) constituting the facial cleansing sheet 1. The amount (%) of moisturizing agent applied to the nonwoven fabric sheet is calculated by dividing the weight of moisturizing agent contained in the nonwoven fabric sheet of the target product by the weight of the substrate (nonwoven fabric) without the moisturizing agent. The amount of moisturizing agent applied to the nonwoven fabric sheet can be calculated by the following steps (1) to (3). (1): Measure the weight of the target facial cleansing sheet (sample left to stand in a constant temperature and humidity chamber at 20°C and 60% RH for at least 8 hours). (2): The facial cleansing sheet is thoroughly washed with distilled water to remove the moisturizing agent, and then the nonwoven fabric is dried in a dryer. Similarly, the weight of a sample that has been left standing in a constant temperature and humidity chamber for 8 hours or more is measured and this is the weight of the substrate (nonwoven fabric) that does not contain the moisturizing agent. (3): The weight of the moisturizing agent in the facial cleansing sheet is calculated from the difference between the weights of (1) and (2), and this weight is divided by the weight of the substrate (nonwoven fabric) that does not contain the moisturizing agent to obtain the moisturizing agent coating amount (%).

[0055] FIG. 4 also shows data measured for the surface friction coefficient of two types of conventional commercially available dry tissues (containing a moisturizing agent, but the amount of coating is unknown) as Comparative Examples 1 and 2.

[0056] Of the six samples A to F shown in Figure 4, three samples - Sample C (moisturizing agent coating amount = 4.8%), Sample D (moisturizing agent coating amount = 7.6%), and Sample E (moisturizing agent coating amount = 11.0%) - correspond to the facial cleansing sheet 1 of this embodiment. Sample A (moisturizing agent coating amount = 0%) represents a substrate (nonwoven fabric) that is not coated with a moisturizing agent. Sample B (moisturizing agent coating amount = 3.8%) represents a case in which the moisturizing agent coating amount (%) is smaller than that of the facial cleansing sheet 1 of this embodiment, and Sample F (moisturizing agent coating amount = 15.1%) represents a case in which the moisturizing agent coating amount (%) is greater than that of the facial cleansing sheet 1 of this embodiment.

[0057] First, we focus on the surface friction coefficient (MIU) of the sheet member. The surface friction coefficient (MIU) represents the friction coefficient at the contact surface when a certain object and a sheet member are brought into contact with each other, and is a value that serves as an index of the smoothness felt when rubbing the surface of an object. For example, when a sample sheet member (nonwoven fabric) is placed against human skin and rubbed, the smaller the MIU, the smoother the feel and the better the texture. On the other hand, if the MIU is large, the sheet feels hard, the texture deteriorates, and it is more likely to cause discomfort.

[0058] The surface friction coefficient was measured as follows. First, the sheet material to be measured was cut to a predetermined size (200 mm long x 200 mm wide, 2 mm thick or less) to serve as a test specimen. Next, the tester (e.g., a Kato Tech surface tester, model number KES-FB4-A) was turned on and allowed to preheat for 15 minutes. Then, using the CHECK option on the host, the OSC oscillation voltage, BAL balance, and ZERO zero bit were checked to see if the SENS range was within the specified range, and the knob was moved to the MES test mode. Next, the test specimen was pressed with both hands until the red light on the test bench came on. Next, the MEASURE button was pressed, and after waiting for MEASURE and other indicators to flash, the computer was started to track and record the sample's real-time test curve. The test specimen movement speed was 1.0 mm / sec. This measurement was repeated multiple times (e.g., 10 times), and the average value was used as the surface friction coefficient (MIU).

[0059] Figure 5 is a graph showing the relationship between the liquid coating amount and the coefficient of surface friction (MD and CD). In Figure 5, the magnitude of the coefficient of surface friction (MIU) in the MD (machine direction) and CD (cross direction) is plotted for each of samples A to F. The magnitude of the coefficient of surface friction (MIU) is the average value of the coefficient of surface friction measured according to the above-mentioned test method.

[0060] In both the MD and CD directions, Sample A, which had a 0% moisturizer coating amount, had the largest surface friction coefficient, and Samples B to F, which were coated with moisturizer, had smaller surface friction coefficients than Sample A. This confirms that coating a liquid such as a moisturizer on a nonwoven fabric (substrate) makes the surface of the nonwoven fabric (substrate) smooth to the touch.

[0061] In the CD direction, the coefficient of surface friction gradually decreases as the amount of humectant coated increases (see Samples B to E). This is thought to be because the inclusion of a humectant makes it easier for the nonwoven fabric to retain moisture, which in turn increases the flexibility of the fibers and reduces friction. On the other hand, Sample F, which has a high amount of humectant coated (liquid coating amount = 15.1%), has a high coefficient of surface friction. This is thought to be because an excessively high impregnation rate of the humectant or other liquid reduces the rigidity of the nonwoven fabric, making the fibers more susceptible to fuzzing and increasing friction. The fuzzing of the fibers on the surface of Sample F is also evident from the fuzzing photograph in Figure 4.

[0062] In addition, a sensory test was conducted on the texture of Samples A to F and Comparative Examples 1 and 2. In the sensory test, multiple subjects (e.g., 30 subjects) were asked to wipe their faces in the MD and CD directions with each sample and comparative example, and if 70% or more of the subjects felt that the texture was good, a rating of "Good" was given. As a result, in the MD direction, Samples B to F were rated "Good," while Sample A was rated "Poor." In the CD direction, Samples C to E were rated "Good," while Samples A, B, and F were rated "Poor." Therefore, it was confirmed that a surface friction coefficient of at least 0.18 (the surface friction coefficient in the CD direction of Sample C) or less can provide a user with a good texture.

[0063] In Comparative Examples 1 and 2 (conventional commercially available tissues), the measured values ​​of the surface friction coefficient in both the MD and CD directions were 0.24 or more, and the results of the sensory test conducted by the above-mentioned method were both x.

[0064] For these reasons, in a facial cleansing sheet 1 that uses a single-layer nonwoven fabric as the base material and contains a liquid such as a moisturizer, it is preferable that the average surface friction coefficient in each of the MD direction (longitudinal direction) and CD direction (transverse direction) be 0.18 or less.

[0065] In sheet members in which multiple sheets are stacked in the thickness direction, such as conventional tissues, delamination occurs when wiping the face, causing the sheets to peel off, making it difficult to ensure strength. In contrast, the facial cleansing sheet 1 is constructed from a single-layer nonwoven fabric, which makes it less likely to delaminate when wiping the face and makes it easier to ensure strength. Furthermore, the inclusion of a moisturizing agent enhances the moisturizing properties of the nonwoven fabric and makes it easier to retain moisture, thereby making it easier to maintain flexibility. Furthermore, by setting the surface friction coefficient (average value) to 0.18 or less, the sheet feels smoother against the skin when placed against the face than in the opposite case, making it easier for the user to feel soft. This makes it possible to realize a facial cleansing sheet with improved strength, flexibility, and moisturizing properties.

[0066] Next, we will focus on the rigidity of the sheet member. As factors that affect the rigidity of the sheet member, it is necessary to consider the basis weight and bending length shown in the table of FIG. 4. Here, "basis weight (gsm)" represents the weight (g) per unit area (1 square meter) of the sheet member. Normally, the smaller the basis weight, the thinner the sheet member and the lower the rigidity, but if the basis weight is too low, it becomes difficult to ensure the strength of the sheet member. Furthermore, "bending length (cm)" is an index representing the bending resistance of the sheet member; the shorter the bending length, the lower the bending resistance (higher flexibility) of the sheet member.

[0067] In Figure 4, the basis weights of Samples B to F, which contain a liquid such as a moisturizer, are all 73 gsm or more, which is greater than the 67 gsm basis weight of Sample A, which does not contain a moisturizer. Furthermore, the bending lengths of Samples B to F, which contain a liquid such as a moisturizer, are 2.5 cm or less in the MD direction and 1.4 cm or less in the CD direction. In contrast, the bending length of Sample A, which does not contain a moisturizer, is 2.8 cm in the MD direction and 1.6 cm in the CD direction. In other words, by including a moisturizer in the nonwoven fabric substrate, Samples B to F have a larger basis weight and a shorter bending length than those without a moisturizer. In other words, by including a moisturizer in a substrate (nonwoven fabric) having a predetermined basis weight, the sheet member can be made more flexible (i.e., the bending resistance can be reduced) while maintaining its strength.

[0068] Samples B to F in Figure 4 have a basis weight of at least 73 gsm or more, and a bending length (bending resistance) in both the MD direction (longitudinal direction) and CD direction (transverse direction) of 2.5 cm or less. It can be seen that such a configuration ensures strength and flexibility sufficient for use as a facial cleansing sheet (for example, use in the sensory test described above). Samples C to E, which correspond to the facial cleansing sheet 1 of this embodiment, have a basis weight of 73 gsm or more and a bending length (bending resistance) of 2.3 cm or less, confirming that they have higher flexibility while maintaining strength.

[0069] The bending length (bending resistance) of a sheet member can be measured as follows. FIGS. 6A and 6B are diagrams illustrating a method for measuring bending length. First, the sheet member to be measured is cut into a plurality of rectangular pieces (e.g., six pieces) of a predetermined size (short side: 25±1 mm × long side: 250±1 mm) to prepare test pieces. Next, a bending resistance measuring device 200 is prepared. As shown in FIG. 6A , the bending resistance measuring device 200 includes a horizontal base 201 on which the test piece is placed, and an inclined portion 202 that slopes obliquely downward from one end 201t of the horizontal base 201 in the longitudinal direction. The inclined portion 202 has an inclination angle θ of 41.5 degrees with respect to the horizontal direction. Then, the test piece is placed on the horizontal base 201 so that the long side of the test piece is parallel to the longitudinal direction of the horizontal base 201, and one end of the long side of the test piece is aligned with one end 201t of the horizontal base 201 in the longitudinal direction, and the test piece is held down from above with a wooden ruler 205 as shown in Figure 6A.

[0070] From this state, the wooden ruler 205 is gently pushed from the other longitudinal side to the other longitudinal side of the horizontal base 201, and the test piece is moved horizontally at a constant speed (e.g., 2 mm / s) so that it slides on the horizontal base 201. As a result, one end of the test piece in the longitudinal direction protrudes from the end 201t of the horizontal base 201, and the protruding portion deforms under its own weight, eventually coming into contact with the inclined portion 202. At this time, the length L (cm) of the horizontal movement of the wooden ruler 205 is measured. After measuring the length L, the test piece is flipped over and a similar measurement is performed. This measurement is performed on each of the multiple test pieces, and the bending length (bending resistance) is determined by dividing the average L' of the measured value (length L) on the front side and the measured value (length L) on the back side by 2.

[0071] Furthermore, in the facial cleansing sheet 1 of this embodiment, the coating amount of moisturizer is preferably 4.8% or more and 11% or less. In Figure 4, Samples A and B, which have a coating amount of moisturizer less than 4.8%, have a higher coefficient of surface friction and higher stiffness than Samples C to E, which have a coating amount of moisturizer of 4.8% or more, making them less likely to provide a facial cleansing sheet with a pleasant feel. Furthermore, Sample F, which has a coating amount of moisturizer greater than 11%, exhibits greater fuzzing on the sheet surface than Samples C to E, which have a coating amount of 11% or less, making the sheet more likely to have a poor feel and strength. Furthermore, when the surface becomes fuzzed, the increased water repellency reduces the water absorption rate, potentially making the sheet less suitable for use when washing the face. In contrast, samples C to E, in which the amount of moisturizer applied is 4.8% or more and 11% or less, have sufficient strength while also providing good texture and water absorption (water retention) compared to the opposite case (in which the amount of liquid containing moisturizer applied is less than 4.8% and more than 11%), making them suitable for use when washing the face.

[0072] In Figure 4, the fluffing of the sheet member surface is evaluated based on the grades specified in China's GB / T 4802.1-2008. For example, according to the test parameters, the sheet member (test specimen) is rubbed with a specified nylon brush or cloth abrasive to remove fluff and pilling, and then visual evaluation of fluffing and pilling is performed under specified lighting conditions. In Figure 4, sample F, which has a liquid coating weight (%) of 15.1%, has a fluffing grade of Grade 2, while samples A to E, which have a liquid coating weight of 11% or less, have fluffing grades of Grades 3 to 3.5. As described above, sample F, which has significant surface fluffing, is likely to deteriorate the strength, feel, and water absorbency of the sheet member. Therefore, for the facial cleansing sheet 1 of this embodiment, it is preferable that the fluffing grade be Grade 3 or higher according to GB / T 4802.1-2008. This prevents excessive fluffing on the sheet surface, making it possible to realize a sheet member that is smooth to the touch and not too weak in strength, making it more suitable for use when washing the face.

[0073] Furthermore, the nonwoven fabric, which is the base material of the facial cleansing sheet 1, is mainly composed of hydrophilic fibers derived from natural sources. Fibers derived from natural sources tend to have higher water absorption properties than fibers derived from petroleum or other petrochemical materials, and therefore can be used to make nonwoven fabrics with good moisture retention and water absorption properties. Furthermore, the absorbed moisture helps the nonwoven fabric to maintain its flexibility, making it suitable for use on sensitive skin and ideal as a facial cleansing sheet.

[0074] The liquid applied to the facial cleansing sheet 1 contains hydrolyzed hyaluronic acid and centella in addition to moisturizing agents (see Figure 2). These hydrolyzed hyaluronic acid and centella function as moisturizing agents and anti-evaporation agents, and have skin-beautifying effects such as suppressing skin dryness and imparting elasticity. Therefore, a facial cleansing sheet that provides a pleasant feel when washing the face and also provides skin care can be realized.

[0075] Furthermore, in Figure 4, the tensile strength of Samples C to E is 40 N / 50 mm or more in both the MD direction (longitudinal direction) and the CD direction (transverse direction). Conventionally, sheet materials such as nonwoven fabrics used for facial cleansing have been practically usable with a tensile strength of about 30 N / 50 mm. In other words, the facial cleansing sheet 1 of this embodiment (Samples C to E) contains a medicinal solution such as a moisturizing agent to ensure flexibility and moisture retention, while also having sufficient strength (30 N / 50 mm or more) to withstand use for at least facial cleansing. Therefore, a facial cleansing sheet that is tear-resistant while maintaining moisture retention and flexibility can be realized.

[0076] The tensile strength (N / 50 mm) of the sheet member can be measured as follows. First, multiple test pieces (e.g., three pieces) measuring approximately 50 mm x approximately 200 mm are cut from each of Samples A to F. Next, the cut test pieces are clamped between the chucks of a tensile tester (e.g., Instron Series 2712 & 2732) and adjusted so that the chuck distance is 100 mm without the test pieces loosening. The test pieces are then pulled at a pulling rate of 10 cm / min to widen the chuck distance, and the force (N) at which the test pieces break is recorded. This measurement is repeated for multiple (three) test pieces, and the average force (N) at which the test pieces break is taken as the tensile strength (N / 50 mm).

[0077] 7A to 7C are diagrams illustrating the appearance of the facial cleansing sheet 1 when pulled in the longitudinal direction (MD direction) and the transverse direction (CD direction). FIG. 7A shows one side of the thickness direction of the facial cleansing sheet 1 in its natural state before pulling, and the other side of the thickness direction. As described in FIG. 3, the substrate (nonwoven fabric) of the facial cleansing sheet 1 is manufactured by stacking and integrating a cross web having a fiber orientation inclined with respect to the longitudinal direction (MD direction) and a parallel web having a fiber orientation parallel to the longitudinal direction (MD direction) in the thickness direction. Therefore, FIG. 7A shows a state in which the fiber orientation on one side of the thickness direction of the facial cleansing sheet 1 is inclined with respect to the MD direction (cross web), and a state in which the fiber orientation on the other side of the thickness direction is parallel to the MD direction (parallel web). However, Figure 7A is a conceptual representation of fiber orientation for the purpose of explanation, and in an actual facial cleansing sheet 1 (nonwoven fabric), the fibers are intricately entangled with each other, so the fiber orientation on one side and the other side in the thickness direction is not clearly different as in Figure 8A.

[0078] FIG. 7B shows the state of the facial cleansing sheet 1 of FIG. 7A when pulled in the machine direction (MD). Here, "pulled in ~ direction" refers to the state when the sheet is pulled 1.1 to 1.4 times the original length. For example, in the case of a sheet 200 mm long in the first direction, this refers to the state when the sheet is pulled to approximately 220 mm to 280 mm in the first direction. In FIG. 7B, there is no significant difference in appearance between one side and the other side in the thickness direction. This is due to the properties of the substrate (nonwoven fabric) of the facial cleansing sheet 1. The parallel webs that make up more than 50% of the substrate (nonwoven fabric) of the facial cleansing sheet 1 basically have fiber orientation parallel to the machine direction (MD), making them more resistant to pulling in the machine direction (MD) than in the cross direction (CD). In fact, referring to the measured values ​​of tensile strength (N / 50 mm) in Figure 4, in all cases of samples C to E, the tensile strength in the longitudinal direction (MD direction) is stronger than the tensile strength in the transverse direction (CD direction). Therefore, when the facial cleansing sheet 1 is pulled in the longitudinal direction (MD direction), it is less likely to elongate significantly in the pulling direction (MD direction) compared to when it is pulled in the transverse direction (CD direction) (see Figure 7C described below). Therefore, there is little change in appearance between one side and the other side in the thickness direction before and after pulling.

[0079] 7C shows the state when the facial cleansing sheet 1 of FIG. 7A is pulled in the cross direction (CD). In FIG. 7C, there is a significant difference in appearance between one side and the other side in the thickness direction. The parallel web and cross web constituting the substrate (nonwoven fabric) of the facial cleansing sheet 1 both have weaker tensile strength in the cross direction (CD direction) than in the longitudinal direction (MD direction), so the facial cleansing sheet 1 as a whole is more likely to stretch in the cross direction (CD direction). At this time, on the other side of the thickness direction, multiple wrinkles are formed along the cross direction on the surface of the nonwoven fabric as the facial cleansing sheet 1 stretches in the cross direction (CD direction). That is, the surface of the nonwoven fabric undergoes uneven deformation in the thickness direction. Furthermore, multiple wrinkles are formed along the cross direction on the surface of the nonwoven fabric on one side of the thickness direction, but the number and size of the wrinkles (unevenness) are smaller than on the other side of the thickness direction.

[0080] 8A and 8B are images of the facial cleansing sheet 1 in the state of FIG. 7C. Fig. 8A is a photographic image corresponding to one side of Fig. 7C, and Fig. 8B is a photographic image corresponding to the other side of Fig. 7C. As shown in Fig. 8A and 8B, when the facial cleansing sheet 1 is pulled in the lateral direction (CD direction), wrinkles (unevenness) are formed along the lateral direction, but the number of unevennesses formed per unit area and the height of the unevenness are different on one side and the other side in the thickness direction. This is because the tensile strength in the lateral direction (CD direction) is different on one side and the other side in the thickness direction.

[0081] Specifically, on one side of the thickness direction, the cross-web, which has fiber orientation in a direction inclined to the machine direction (MD), exerts a large influence (see FIG. 7A ), creating a resistance to tension in the cross direction (CD), which acts to suppress shrinkage of the nonwoven fabric in the machine direction (MD). Therefore, on the surface on one side of the thickness direction, shrinkage in the machine direction (MD) is less likely to affect the surface, and wrinkles (unevenness) are less likely to form.

[0082] On the other hand, on the other side of the thickness direction, the parallel webs having fiber orientation parallel to the machine direction (MD) have a large influence (see FIG. 7A ), so resistance to pulling in the cross direction (CD) is less likely to act, and the nonwoven fabric is more likely to shrink in the machine direction (MD) as it is pulled in the cross direction (CD). Therefore, on the other side of the thickness direction, the influence of shrinkage in the machine direction (MD) is more likely to act, and the fabric deforms in the thickness direction as it shrinks in the machine direction (MD), making it more likely to form wrinkles (unevenness) on the surface.

[0083] Furthermore, because the facial cleansing sheet 1 is coated with a liquid such as a moisturizer, the tensile strength of the nonwoven fabric is weaker than when no liquid is coated, making it more likely to stretch in the cross direction (CD direction).As a result, the structure is such that wrinkles are more likely to form when shrinking in the longitudinal direction (MD direction).

[0084] As described above, in the facial cleansing sheet 1 of this embodiment, the fiber orientation of the fibers constituting the nonwoven fabric substrate differs between one side and the other side in the thickness direction. This configuration increases the probability that fibers with different orientations will intersect, increasing the number of fiber entanglement points during nonwoven fabric production and making it easier to increase the strength of the nonwoven fabric as a whole. Furthermore, the different fiber orientation between one side and the other side in the thickness direction makes it easier for the nonwoven fabric to bend along the fibers in different directions. In other words, compared to when the nonwoven fabric is only easily bent in a specific direction, the entire nonwoven fabric is more likely to bend and deform in three dimensions. Therefore, when used for facial cleansing, etc., the nonwoven fabric can freely deform according to the unevenness of the user's skin, improving the feel on the skin.

[0085] Here, fiber orientation refers to the typical fiber arrangement direction as described above, and the state in which "fiber orientation differs between one side and the other side in the thickness direction" can be identified as follows. First, the face to be measured is placed on a flat plate with the surface facing up so that wrinkles do not form on the surface of the facial cleansing sheet 1. Next, using a microscope (for example, a scanning electron microscope such as JCM-5100 manufactured by JEOL Ltd.), an enlarged image is taken from a direction perpendicular to the measurement surface, printed, and the fibers are traced on a transparent PET sheet. The enlarged image is an image enlarged to a magnification that allows measurement of 10 or more fibers, and the magnification is, for example, 50 to 300 times. Next, the image is imported into a personal computer, and the image is binarized using nexusNewQube (standalone version) image processing software manufactured by Nexus Corporation. Using the fiber orientation analysis program, Fiber Orientation Analysis 8.13 Single, the orientation angle and the orientation intensity at that orientation angle are obtained from the binarized image. This measurement is repeated several times (for example, 3 to 5 times), the average value is calculated, and the direction along the orientation angle at which the orientation intensity is greatest is determined to be the representative arrangement direction of the fibers on the measurement surface (fiber orientation direction).

[0086] The fiber orientation is considered to be different when the smaller angle between the typical fiber arrangement direction on one side of the thickness direction and the typical fiber arrangement direction on the other side of the thickness direction is greater than 30 degrees. Note that, due to the large influence of the cross web on one side of the thickness direction of the facial cleansing sheet 1, the fiber orientation may vary and be difficult to determine in a fixed direction. In such cases, the fiber orientation is measured at multiple locations on one side of the thickness direction, and each of these is compared with the fiber orientation on the other side of the thickness direction. Incidentally, due to the large influence of the parallel web on the other side of the thickness direction of the facial cleansing sheet 1, the fiber orientation is less likely to vary significantly compared to the one side of the thickness direction.

[0087] Furthermore, in the face-cleansing sheet 1, the number of irregularities per unit area and the height of the irregularities formed on the surface of the nonwoven fabric when pulled in the longitudinal direction (MD) are different from the number of irregularities per unit area and the height of the irregularities formed on the surface of the nonwoven fabric when pulled in the transverse direction (CD). Specifically, when pulled in the transverse direction (CD), large irregularities (wrinkles) are likely to form on the surface of the nonwoven fabric on the other side of the thickness direction (see Figures 7B and 7C). By pulling the nonwoven fabric, such irregularities (wrinkles) are formed on the surface, which makes it easier to wipe off water droplets, sebum, etc., adhering to the skin, making it a sheet member more suitable for use when washing the face.

[0088] Furthermore, when the facial cleansing sheet 1 is pulled in either the longitudinal direction (MD direction) or the transverse direction (CD direction) (the direction perpendicular to the typical orientation direction of the fibers constituting the nonwoven fabric, i.e., the transverse direction in the above example), the number of irregularities formed per unit area on the surface of the nonwoven fabric on one side in the thickness direction and the height of the irregularities are different from the number of irregularities formed per unit area on the surface of the nonwoven fabric on the other side in the thickness direction and the height of the irregularities. Specifically, when pulled in the transverse direction (CD direction), larger irregularities (wrinkles) are more likely to form on the other side in the thickness direction than on the one side (see Figures 7B and 7C). This makes it easier to distinguish between the front and back of the facial cleansing sheet 1, allowing the user to efficiently use both sides of the facial cleansing sheet 1 when washing their face. Furthermore, the facial cleansing sheet 1 can be used in a variety of ways, such as wiping away moisture and sebum on the side with larger irregularities and gently wiping the skin on the side with smaller irregularities.

[0089] Furthermore, when such a facial cleansing sheet 1 is pulled in the transverse direction (CD direction), the angle between the typical fiber arrangement direction and the longitudinal direction (MD direction) is smaller on the side where the number of irregularities per unit area and the height of the irregularities are larger than on the side where the number of irregularities per unit area and the height of the irregularities are smaller. That is, the side where the fibers are arranged along the longitudinal direction (MD direction) is more likely to form large irregularities (wrinkles) than the side where the fibers are arranged obliquely relative to the longitudinal direction (MD direction). This configuration can further improve the ease of use of the facial cleansing sheet 1. For example, after washing your face, if you take out the facial cleansing sheet 1 and wipe it for the first time, you can pull the sheet in a direction perpendicular to the fiber orientation direction to generate large irregularities (wrinkles) on one side. This allows the irregularities (wrinkles) of the sheet to gently contact the skin in areas that could not be absorbed when wiped in a smooth, uneven state, allowing you to feel a sufficient and gentle wiping sensation with just one sheet. Therefore, the user can use the face cleansing sheet 1 in a more versatile manner.

[0090] Furthermore, when the facial cleansing sheet 1 is pulled in the direction along the fiber orientation, almost no unevenness is formed, and the sheet remains smooth (see FIG. 7B ). This allows the facial cleansing sheet 1 to be used on a smooth surface (when wiping areas of the face with little unevenness) or on an uneven surface (when wiping areas of the face with a lot of unevenness). For example, when removing the facial cleansing sheet 1 from a container or package containing it, by aligning the pulling direction of the sheet with the fiber orientation direction, it is possible to remove and use the sheet with a surface smoothness and size similar to those before removal. Conversely, by orthogonally aligning the pulling direction of the sheet with the fiber orientation direction when removing it, it is possible to actively generate unevenness during use.

[0091] ===Other Embodiments= ...

[0092] 1 Facial cleansing sheet, 10a Nonwoven fabric sheet, 10c Cross web, 10s Parallel web, 100 Nonwoven fabric manufacturing apparatus, 105 Conveying mechanism, 110 Carding mechanism, 110A Cross web carding mechanism, 110B Parallel web carding mechanism, 120 High pressure water flow mechanism, 130 Drying mechanism, 140 Winding mechanism, 200 Bending resistance measuring device, 201 Horizontal base portion, 202 Inclined portion, 205 Wooden ruler

Claims

1. A facial cleansing sheet made of a nonwoven fabric having a vertical direction and a horizontal direction perpendicular to each other and in which a plurality of fibers are entangled, the nonwoven fabric having a single layer structure and containing a moisturizing agent, the average surface friction coefficients in both the vertical direction and the horizontal direction being 0.18 or less.

2. A facial cleansing sheet according to claim 1, characterized in that the sheet has a basis weight of 73 gsm or more and a bending resistance in both the longitudinal direction and the transverse direction of 2.5 cm or less.

3. A facial cleansing sheet according to claim 1 or 2, characterized in that the fiber orientation of the fibers constituting the nonwoven fabric is different between one side and the other side in the thickness direction.

4. A facial cleansing sheet according to claim 1 or 2, characterized in that the amount of the moisturizing agent applied to the nonwoven fabric is 4.8% or more and 11% or less.

5. A facial cleansing sheet according to claim 1 or 2, characterized in that the fibers constituting the nonwoven fabric are mainly made of hydrophilic naturally derived materials.

6. A facial cleansing sheet according to claim 1 or 2, characterized in that the tensile strength in each of the longitudinal direction and the lateral direction is 30 N / 50 mm or more.

7. A facial cleansing sheet according to claim 1 or 2, characterized in that the grade of the facial cleansing sheet in accordance with GB / T4802.1-2008 is 3 or higher.

8. A facial cleansing sheet according to claim 1 or 2, characterized in that the nonwoven fabric contains at least one of hyaluronic acid and centella.

9. A facial cleansing sheet according to claim 1 or 2, characterized in that the fiber orientation of the fibers constituting the nonwoven fabric is different between one side and the other side in the thickness direction.

10. A facial cleansing sheet as described in claim 9, characterized in that the number of protrusions and recesses per unit area formed on the surface of the facial cleansing sheet when pulled in the vertical direction and the height of the protrusions and recesses are different from the number of protrusions and recesses per unit area formed on the surface of the facial cleansing sheet when pulled in the horizontal direction and the height of the protrusions and recesses.

11. A facial cleansing sheet made of a nonwoven fabric having a vertical direction and a horizontal direction perpendicular to each other and in which a plurality of fibers are entangled, wherein the nonwoven fabric has a single-layer structure and contains a moisturizing agent, and wherein, when pulled in either the vertical direction or the horizontal direction, the number of protrusions and recesses per unit area formed on one side of the face in the thickness direction of the facial cleansing sheet and the height of the protrusions and recesses are different from the number of protrusions and recesses per unit area formed on the other side of the face in the thickness direction of the facial cleansing sheet and the height of the protrusions and recesses.

12. A facial cleansing sheet as described in claim 11, characterized in that the fiber orientation of the fibers constituting the nonwoven fabric is different between one side and the other side in the thickness direction, and when pulled in the horizontal direction, the angle between the fiber orientation direction and the vertical direction on the side where the number of protrusions and recesses per unit area and the height of the protrusions and recesses is greater is smaller than the angle between the fiber orientation direction and the vertical direction on the side where the number of protrusions and recesses per unit area and the height of the protrusions and recesses is smaller.

13. A facial cleansing sheet as claimed in claim 10 or 11, characterized in that when pulled in a direction along the fiber orientation direction of the fibers constituting the nonwoven fabric, no irregularities are formed and the sheet remains smooth.

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