Facial cleansing sheets

Abstract

A facial cleansing sheet (1) has a vertical direction and a horizontal direction and comprises nonwoven fabric in which a plurality of fibers are entangled. The nonwoven fabric has a single layer structure and contains a moisturizing agent. The average values of the surface coefficients of friction in each of the vertical direction and the horizontal direction are 0.18 or less.

Description

Technical Field

[0001] The present invention relates to a face washing sheet.

Background Art

[0002] Conventionally, in sheet members such as non-woven fabrics and tissues, sheet members have been known that are made suitable for use during face washing by improving flexibility and moisture retention. For example, Patent Document 1 discloses a technology related to tissue paper having a three-ply (layer) or four-ply (layer) laminated structure, in which a moisture retention material is applied to each layer to ensure the necessary softness while reducing stickiness on the outer surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a sheet member having a laminated structure with a plurality of plies (layers) such as in Patent Document 1, when used for face washing or the like, the overall strength may become insufficient, for example, it may be easily peeled between layers. On the other hand, when trying to increase the strength of a conventional sheet member, it was generally lacking in flexibility. Furthermore, it was difficult to well balance and increase the moisture retention in addition to strength and flexibility to be suitable for use during face washing.

[0005] The present invention has been made in view of the above conventional problems, and its object is to provide a face washing sheet with enhanced strength, flexibility, and moisture retention.

Means for Solving the Problems

[0006] The main invention for achieving the above object is, It has a vertical and horizontal direction that is orthogonal to each other, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in both the longitudinal and transverse directions are 0.18 or less. And, The basis weight is 73 gsm or more, and the stiffness in both the longitudinal and transverse directions is 2.5 cm or less. This is a facial cleansing sheet characterized by the following features.

[0007] Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a facial cleansing sheet with enhanced strength, flexibility, and moisturizing properties. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of facial cleansing sheet 1. [Figure 2] This is a flowchart illustrating the manufacturing method of facial cleansing sheets 1. [Figure 3] This diagram illustrates a nonwoven fabric manufacturing apparatus 100 that forms the nonwoven fabric that will serve as the base material for the facial cleansing sheet 1. [Figure 4] This table explains the functional evaluation data for facial cleansing sheet 1. [Figure 5] This graph shows the relationship between the amount of liquid coating and the surface friction coefficient (MD direction and CD direction). [Figure 6] Figures 6A and 6B illustrate the method for measuring bending length. [Figure 7] Figures 7A to 7C illustrate what happens when the facial cleansing sheet 1 is pulled in the vertical direction (MD direction) and the horizontal direction (CD direction). [Figure 8]FIG. 8A and FIG. 8B are diagrams showing an image of the face washing sheet 1 in the state of FIG. 7C.

DETAILED DESCRIPTION OF THE INVENTION

[0010] From the description of this specification and the attached drawings, at least the following matters become clear.

[0011] (Aspect 1) A face washing sheet made of a non-woven fabric having a longitudinal direction and a lateral direction perpendicular to each other and in which a plurality of fibers are entangled, the non-woven fabric having a single-layer structure and containing a moisturizing agent, and the average value of the surface friction coefficients in each of the longitudinal direction and the lateral direction being 0.18 or less. A face washing sheet characterized by the above.

[0012] According to the face washing sheet of Aspect 1, by being composed of a single-layer non-woven fabric, it is difficult for delamination between layers to occur when wiping the face, and it is easy to ensure strength. Also, by containing a moisturizing agent, the moisturizing property is enhanced, and since moisture is easily retained, it is easy to maintain flexibility. And by setting the surface friction coefficient (average value) to 0.18 or less, the skin feel when applied to the face becomes smoother compared to the case of the opposite, and it is possible to easily make the user feel flexibility. Thereby, it is possible to provide a face washing sheet with enhanced strength, flexibility, and moisturizing property.

[0013] (Aspect 2) The face washing sheet according to Aspect 1, having a basis weight of 73 gsm or more and a stiffness in each of the longitudinal direction and the lateral direction of 2.5 cm or less.

[0014] According to the face washing sheet of Aspect 2, it is possible to ensure both strength and flexibility sufficient to withstand use as a face washing sheet.

[0015] (Aspect 3) The face washing sheet according to Aspect 1 or 2, in which the fiber orientation of the fibers constituting the non-woven fabric is different between one side and the other side in the thickness direction.

[0016] According to the face-washing sheet of Aspect 3, the probability that fibers having different orientations cross each other is increased, and the entanglement points of the fibers increase when manufacturing the non-woven fabric, making it easy to enhance the strength of the entire non-woven fabric. Further, since the fiber orientation is different between one side and the other side in the thickness direction, the entire non-woven fabric is likely to undergo three-dimensional bending deformation. When in use such as face-washing, the non-woven fabric can freely deform according to the unevenness of the user's skin, improving the texture.

[0017] (Aspect 4) The face-washing sheet according to any one of Aspects 1 to 3, wherein the coating amount of the moisturizing agent applied to the non-woven fabric is 4.8% or more and 11% or less.

[0018] According to the face-washing sheet of Aspect 4, when the coating amount of the moisturizing agent is less than 4.8%, the surface friction coefficient is large, the stiffness and softness are high, and the texture is likely to deteriorate. On the other hand, when the coating amount of the moisturizing agent is more than 11%, the fluffing on the sheet surface becomes large, the texture and strength of the sheet member are likely to decrease, the water repellency is high, and the water absorption rate is likely to decrease. Therefore, by setting the coating amount of the moisturizing agent to 4.8% or more and 11% or less, it becomes easier to achieve sufficient strength while realizing good texture and water absorption (water retention) compared to the reverse case.

[0019] (Aspect 5) The face-washing sheet according to any one of Aspects 1 to 4, wherein the fibers constituting the non-woven fabric are mainly composed of hydrophilic natural-derived materials. [[ID=‎18]]

[0020] According to the face-washing sheet of Aspect 5, fibers mainly composed of hydrophilic natural-derived materials are likely to enhance the water absorption of the fibers themselves compared to fibers composed of petrochemical-derived materials such as petroleum. Therefore, a sheet having good moisture retention and water absorption can be obtained. Further, since the flexibility of the non-woven fabric is likely to be maintained by the absorbed moisture, it is suitable for use on sensitive skin and is suitable as a face-washing sheet.

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

[0022] According to the facial cleansing sheet of embodiment 6, flexibility and moisturizing properties are ensured by including a liquid such as a moisturizer, while possessing sufficient strength (30N / 50mm or more) to withstand use as a facial cleanser. Therefore, a facial cleansing sheet that is tear-resistant while maintaining moisturizing properties and flexibility can be realized.

[0023] (Aspect 7) A facial cleansing sheet as described in any of the embodiments 1 to 6, having a grade of 3 or higher in accordance with GB / T4802.1-2008.

[0024] According to the facial cleansing sheet of embodiment 7, excessive fluffing of the sheet surface is suppressed, resulting in a facial cleansing sheet that is smooth to the touch and has sufficient strength to be more suitable for use during facial cleansing.

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

[0026] According to the facial cleansing sheet of embodiment 8, by including hydrolyzed hyaluronic acid and centella, which have the functions of a moisturizer and anti-evaporative agent, it becomes easier to exhibit skin beautifying effects such as suppressing skin dryness and providing elasticity. Therefore, it is possible to realize a facial cleansing sheet that improves the feel on the skin during face washing and also provides skin care.

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

[0028] According to the facial cleansing sheet of embodiment 9, the probability of fibers with different orientations intersecting increases, increasing the number of entangled fibers and thus making it easier to increase the overall strength of the nonwoven fabric. Furthermore, because the fiber orientation differs between one side and the other in the thickness direction, a difference in the direction in which the nonwoven fabric easily bends along those fibers is more likely to occur, making the entire nonwoven fabric more susceptible to three-dimensional bending and deformation. Therefore, when used for facial cleansing, the nonwoven fabric can freely deform according to the contours of the user's skin, improving the feel against the skin.

[0029] (Aspect 10) A facial cleansing sheet according to any one of embodiments 1 to 9, wherein the number of irregularities per unit area and the height of said irregularities formed on the surface of the facial cleansing sheet when pulled in the vertical direction is different from the number of irregularities per unit area and the height of said irregularities formed on the surface of the facial cleansing sheet when pulled in the horizontal direction.

[0030] According to the facial cleansing sheet of embodiment 10, by pulling it in any direction, irregularities (wrinkles) are formed on the surface, and these irregularities make it easier to wipe away water droplets, sebum, etc. that have adhered to the skin, thus making it a sheet material that is more suitable for use during facial cleansing.

[0031] (Aspect 11) A facial cleansing sheet made of a nonwoven fabric having mutually orthogonal longitudinal and transverse directions and in which a plurality of fibers are intertwined, wherein the nonwoven fabric has a single-layer structure and contains a moisturizer, and is characterized in that when pulled in either the longitudinal or transverse direction, the number of irregularities per unit area and the height of the irregularities formed on one side of the thickness direction of the facial cleansing sheet are different from the number of irregularities per unit area and the height of the irregularities formed on the other side of the thickness direction of the facial cleansing sheet.

[0032] According to the facial cleansing sheet of embodiment 11, the front and back sides are easily distinguishable by the size of the bumps and grooves, allowing the user to efficiently use both sides of the facial cleansing sheet when washing their face. Furthermore, the ways in which the facial cleansing sheet can be used can be expanded, such as wiping away moisture and sebum with the side where the bumps and grooves are larger, and gently wiping the skin with the side where the bumps and grooves are smaller.

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

[0034] According to the facial cleansing sheet of embodiment 12, after washing the face and wiping once with the sheet, the sheet can be stretched to create bumps (wrinkles) on one side. This allows the bumps (wrinkles) of the sheet to gently contact the skin in areas that could not be absorbed when wiping with a smooth, wrinkle-free state, providing sufficient cleansing and a gentle wiping sensation with just one sheet. Therefore, it becomes possible to make facial cleansing sheets more versatile and easier for users to use.

[0035] (Aspect 13) The facial cleansing sheet according to embodiment 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, no irregularities are formed and it maintains a smooth state.

[0036] According to the facial cleansing sheet of embodiment 13, the facial cleansing sheet 1 can be used in different ways depending on whether you want to use it on a smooth surface (when wiping areas of the face with few contours) or on a surface with unevenness (when wiping areas of the face with many contours).

[0037] ===Implementation Method=== The embodiments of the present invention will be described below, using the facial cleansing sheet 1 as an example of a sheet material suitable for use during facial cleansing. However, the facial cleansing sheet 1 according to the present invention can also be used for purposes other than facial cleansing (for example, makeup or skincare).

[0038] <Basic composition of facial cleansing sheet 1> Figure 1 is a perspective view of the facial cleansing sheet 1. As shown in Figure 1, the facial cleansing sheet 1 is a rectangular sheet material with mutually orthogonal "vertical direction" (corresponding to the "MD direction" described later), "horizontal direction" (corresponding to the "CD direction" described later), and "thickness direction". In this embodiment, the dimensions of the facial cleansing sheet 1 are assumed to be approximately 200 mm in the vertical direction, 220 mm in the horizontal direction, and 0.5 mm in the thickness direction. However, each dimension can be changed as appropriate, and the shape of the sheet material is not limited to a rectangular shape.

[0039] The facial cleansing sheet 1 is a dry sheet material made by coating a nonwoven fabric base with a predetermined liquid and then drying it. Because it is a dry sheet rather than a wet sheet, it is suitable for wiping away moisture when the body gets wet from washing the face, etc. It also helps to keep the skin cleaner by avoiding wiping with an unsanitary towel after washing the face. On the other hand, although it is dry before wiping, it becomes wet during use, so a certain degree of strength is required. Its main use is wiping after washing the face, but it can also be used to wipe hands and mouths, etc. Multiple facial cleansing sheets 1 are folded (for example, folded in half) and stacked, and packaged in a predetermined packaging material made of a resin sheet or the like (not shown) and distributed to the market as a package.

[0040] The base material constituting the facial cleansing sheet 1 is a nonwoven fabric with a single-layer structure in which numerous fibers are intertwined, for example, spunlace nonwoven fabric is used. The fibers used in the nonwoven fabric are mainly made of hydrophilic natural materials, for example, natural fibers of fibrous cellulose such as cotton, silk, and linen can be used, and more preferably, semi-synthetic fibers such as rayon fibers and lyocell can be used. As will be described in detail later, the nonwoven fabric (base material) used in the facial cleansing sheet 1 of this embodiment has fiber orientation in two or more directions. That is, the arrangement direction of the fibers constituting the nonwoven fabric is in at least two directions. Note that "fiber orientation" refers to the typical arrangement direction of the fibers constituting the nonwoven fabric.

[0041] Furthermore, a "single-layer structure" refers to a structure in which the layers cannot be separated, unlike, for example, tissue paper, which consists of multiple sheets stacked together and can be separated from each other. In this embodiment, a spunlace nonwoven fabric formed by the entanglement of fibers within the web by a high-pressure water flow is used as the base material (described later). Therefore, it is a structure in which the entanglement of fibers cannot be peeled away to separate it into two or more layers, nor can the layers be delaminated in the thickness direction.

[0042] In this embodiment, a liquid (medicinal solution) containing one or more moisturizing and softening components such as glycerin, sorbitol, and polyquaternium, mixed with water (H2O) as a solvent, and further containing one or more skin-beautifying ingredients (skin-care ingredients) such as hyaluronic acid and centella, is applied to a nonwoven fabric base material. By applying and drying the liquid containing these components, the flexibility and moisturizing properties of the nonwoven fabric base material are improved. Since all of these components have the function of moisturizers, they are referred to as moisturizers in a broad sense in this specification. Furthermore, the function of each component is not limited to one type; for example, polyquaternium acts as both a moisturizer 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 base material can be improved, resulting in a smoother feel on the skin during use (such as face washing), while meeting the needs of users who prioritize skin care. However, the liquid is not limited to the above-mentioned ingredients, and the types and amounts of ingredients in the liquid may be changed as appropriate, as long as the solvent contains moisturizers, softeners, and skin-beautifying / skincare ingredients.

[0044] <Method for manufacturing facial cleansing sheets 1> Next, an overview of the manufacturing method of the facial cleansing sheet 1 will be described. Figure 2 is a flowchart illustrating the manufacturing method of the facial cleansing sheet 1. When manufacturing the facial cleansing sheet 1, first, a nonwoven fabric forming process is carried out to form the nonwoven fabric that will serve as the base material (S101).

[0045] Figure 3 is a diagram illustrating a nonwoven fabric manufacturing apparatus 100 that forms the nonwoven fabric that will be the base material for 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 fibers and forms a nonwoven fabric (base material) while conveying the web in a predetermined conveying direction by a conveying mechanism 105 such as a belt conveyor. Hereinafter, the conveying direction in which the web is conveyed will also be called the "MD direction," and the direction perpendicular to the conveying direction on the horizontal plane (the depth direction of the paper in Figure 3) will also be called the "CD direction." The MD direction corresponds to the vertical direction in Figure 1, and the CD direction also corresponds to the horizontal direction in Figure 1.

[0046] During nonwoven fabric manufacturing, raw cotton (here, 100% rayon raw cotton) is first fed into the carding mechanism 110. The carding mechanism 110 loosens the clumps of raw cotton, making the fibers uniform, and forms them into a sheet (planar) by passing them between multiple rolls. In Figure 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 with fiber orientation in a direction inclined with respect to the MD direction. The parallel-web carding mechanism 110B is a mechanism that continuously forms a web with fiber orientation in a direction along the MD direction.

[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 that intersects the MD direction at an angle (sine wave shape in Figure 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 weight of the cross-web 10c and the parallel-web 10s, it is preferable that the basis weight of the parallel-web 10s is relatively smaller. The continuous bodies of the formed cross-web 10c and parallel-web 10s are each conveyed downstream in the MD direction by the conveying mechanism 105.

[0048] The continuous bodies of the cross web 10c and parallel web 10s are transported downstream in the MD direction, overlapped in the thickness direction, and 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, and the pressure of the sprayed water causes the fibers to intertwine, forming a sheet-like nonwoven fabric. In this embodiment, the parallel web 10s and cross web 10c are overlapped in the thickness direction and the fibers intertwine and become integrated, forming a continuous single-layer nonwoven fabric sheet 10a. The nonwoven fabric sheet 10a formed in this way 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, one side in the thickness direction has a fiber orientation oblique to the MD direction, and the other side in the thickness direction has a fiber orientation along the MD direction.

[0049] Next, the nonwoven fabric sheet 10a is transported 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 dried to produce a stable sheet-like nonwoven fabric.

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

[0051] Returning to Figure 2, after the nonwoven fabric, which is the base material, is formed in the nonwoven fabric formation process (S101), a liquid coating process is performed in which a liquid is applied (coated) to the nonwoven fabric (base material) (S102). In the liquid coating process, the above-mentioned liquid is sprayed in the thickness direction from a spray device (not shown) installed at a predetermined position in the MD direction onto the continuous nonwoven fabric sheet 10a that is unwound from the roll-shaped nonwoven fabric sheet 10a and conveyed in the MD direction (conveying direction). As a result, the liquid containing a humectant and a softener is applied (coated) over the entire continuous nonwoven fabric sheet 10a.

[0052] The continuous nonwoven fabric sheet 10a coated with liquid is dried while being transported in the MD direction, and then a cutting process is performed to cut it to a predetermined size (S103). In the cutting process, the continuous nonwoven fabric sheet 10a is cut at predetermined intervals (for example, 200 mm intervals) in the MD direction using a cutter device (not shown) installed at a predetermined position in the MD direction, to become individual facial cleansing sheets 1.

[0053] The facial cleansing sheets 1, cut to predetermined dimensions, are folded in the MD direction or CD direction (S104), packaged in sets of multiple sheets using predetermined packaging material (not shown) (S105), and shipped as packaged facial cleansing sheets 1 for distribution in the market.

[0054] <Evaluation of the functionality of facial cleansing sheets 1> Next, the specific functions of the facial cleansing sheet 1 according to this embodiment will be described. Figure 4 is a table illustrating the functional evaluation data of the facial cleansing sheet 1. Figure 4 shows the results of measurements of surface friction coefficient, bending length, tensile strength, and fluffiness grade for six types of samples A to F, which are made of the same base material (nonwoven fabric) as the base material (nonwoven fabric) that constitutes the facial cleansing sheet 1, but with different amounts (%) of humectant coating. The amount (%) of humectant coating on the nonwoven fabric sheet is the value obtained by dividing the weight of the humectant contained in the nonwoven fabric sheet of the target product by the weight of the base material (nonwoven fabric) without humectant. The amount of humectant coating on the nonwoven fabric sheet can be calculated by the following procedure (1) to (3). (1): Measure the weight of the target facial cleansing sheet (a sample left standing for 8 hours or more in a constant temperature and humidity chamber at 20°C and 60%RH). (2): Wash the facial cleansing sheet thoroughly with distilled water to remove the humectant, and then dry the nonwoven fabric in a dryer. Similarly, the weight of the sample left standing in a constant temperature and humidity chamber for 8 hours or more is measured and taken as the weight of the base material (nonwoven fabric) without the humectant. (3): The weight of the humectant in the facial cleansing sheet is calculated from the difference between the weights of (1) and (2), and the amount of humectant coating (%) is obtained by dividing the weight of the humectant by the weight of the base material (nonwoven fabric) without the humectant.

[0055] Furthermore, Figure 4 shows the surface friction coefficient data measured for two types of commercially available dry tissues (containing moisturizers, although the amount of coating is unknown) as Comparative Example 1 and Comparative Example 2.

[0056] Of the six types of samples A to F shown in Figure 4, three types—Sample C (moisturizer coating amount = 4.8%), Sample D (moisturizer coating amount = 7.6%), and Sample E (moisturizer coating amount = 11.0%)—correspond to the facial cleansing sheet 1 of this embodiment. Sample A (moisturizer coating amount = 0%) represents the base material (nonwoven fabric) without any moisturizer coating. Sample B (moisturizer coating amount = 3.8%) represents the case where the moisturizer coating amount (%) is less than that of the facial cleansing sheet 1 of this embodiment, and Sample F (moisturizer coating amount = 15.1%) represents the case where the moisturizer coating amount (%) is more than that of the facial cleansing sheet 1 of this embodiment.

[0057] First, let's focus on the surface friction coefficient (MIU) of the sheet material. The surface friction coefficient (MIU) represents the coefficient of friction at the contact surface when an object and a sheet material are in contact, and it is a value that serves as an indicator of the smoothness felt when rubbing the surface of an object. For example, when a sample sheet material (nonwoven fabric) is rubbed against a person's skin, the smaller the MIU, the smoother it feels and the better the texture. On the other hand, if the MIU is large, the hardness of the sheet is felt, the texture deteriorates, and discomfort is likely to occur.

[0058] The surface friction coefficient was measured as follows: First, the sheet material to be measured was cut to a specified size (200 mm long x 200 mm wide, with a thickness of 2 mm or less) to serve as a test specimen. Next, the tester (for example, a surface tester manufactured by Kato Tech Co., Ltd.: model number KES-FB4-A) was powered on and preheated for 15 minutes. Then, using the CHECK option on the host, the OSC oscillation voltage, BAL balance, and ZERO zero bit were checked, and it was confirmed that the SENS range was within the specified range, and the knob was moved to the MES test state. Next, the test specimen was pressed with both hands until the red light on the test stand illuminated. Then, the MEASURE button was pressed, and after waiting for the MEASURE indicator to blink, the computer operation was started to track and record the real-time test curve of the sample. The movement speed of the test specimen was set to 1.0 mm / sec. This measurement was repeated multiple times (for example, 10 times), and the average value was taken as the surface friction coefficient (MIU).

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

[0060] In both the MD and CD directions, the surface friction coefficient of sample A, which has 0% humectant coating, is the largest, while samples B through F, which are coated with humectants, have a lower surface friction coefficient than sample A. Therefore, it can be confirmed that coating the nonwoven fabric (substrate) with a liquid such as a humectant makes the surface of the nonwoven fabric (substrate) smoother.

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

[0062] Furthermore, sensory tests were conducted on the texture of samples A to F and comparative examples 1 and 2. In the sensory tests, multiple subjects (e.g., 30 people) were asked to wipe their faces along the MD and CD directions of each sample and comparative example, and a "○" was given if more than 70% of the subjects felt the texture was good. As a result, for the MD direction, samples B to F were ○, and sample A was ×. For the CD direction, samples C to E were ○, and samples A, B, and F were ×. Therefore, it was confirmed that a surface friction coefficient of at least 0.18 (surface friction coefficient of sample C in the CD direction) or less is sufficient to give users a good feeling of texture.

[0063] In comparative examples 1 and 2 (conventional commercially available tissues), the measured surface friction coefficient was 0.24 or higher in both the MD and CD directions, and the results of the sensory tests conducted using the method described above were all negative (×).

[0064] Based on these considerations, in a facial cleansing sheet 1 using a single-layer nonwoven fabric as a base material and containing a liquid such as a moisturizer, it is preferable to set the average value of the surface friction coefficient in both the MD direction (vertical direction) and the CD direction (horizontal direction) to 0.18 or less.

[0065] Conventional sheet materials, such as tissues, which consist of multiple sheets laminated in the thickness direction, tend to delaminate when used to wipe the face, causing the sheets to separate and compromising strength. In contrast, facial cleansing sheet 1 is made of a single-layer nonwoven fabric, making it less prone to delamination when wiping the face and thus easier to maintain strength. Furthermore, the inclusion of a moisturizer enhances the moisture retention of the nonwoven fabric, and the improved moisture retention helps maintain flexibility. By setting the surface friction coefficient (average value) to 0.18 or less, the sheet feels smoother against the skin when applied to the face compared to the opposite case, making it easier for the user to perceive flexibility. As a result, a facial cleansing sheet with enhanced strength, flexibility, and moisture retention can be realized.

[0066] Next, we will focus on the rigidity of the sheet material. Factors that affect the rigidity of the sheet material include the basis weight and bending length, as shown in the table in Figure 4. Here, "basis weight (gsm)" represents the weight (g) per unit area (1 square meter) of the sheet material. Generally, the smaller the basis weight, the thinner the sheet material can be made and the lower its rigidity can be made, but if the basis weight is too small, it becomes difficult to ensure the strength of the sheet material. Also, "bending length (cm)" is an indicator of the rigidity of the sheet material; the shorter the bending length, the lower the rigidity (higher the flexibility) of the sheet material.

[0067] In Figure 4, the basis weight of samples B to F, which contain liquids such as humectants, is 73 gsm or more, which is greater than the basis weight of sample A, which does not contain a humectant and has a basis weight of 67 gsm. Furthermore, the bending lengths of samples B to F, which contain liquids such as humectants, are 2.5 cm or less in the MD direction and 1.4 cm or less in the CD direction. In contrast, the bending lengths of sample A, which does not contain a humectant, are 2.8 cm in the MD direction and 1.6 cm in the CD direction. In other words, in samples B to F, the basis weight is higher and the bending length is shorter compared to the case where no humectant is present, due to the inclusion of a humectant in the nonwoven fabric base material. To put it another way, by including a humectant in a base material (nonwoven fabric) with a predetermined basis weight, it is possible to increase the flexibility (lower the rigidity) while ensuring the strength of the sheet member.

[0068] Samples B to F in Figure 4 have a basis weight of at least 73 gsm, and their bending length (stiffness / flexibility) in both the MD direction (longitudinal direction) and the CD direction (transverse direction) is 2.5 cm or less. This configuration ensures sufficient strength and flexibility for use as a facial cleansing sheet (for example, in the sensory test described above). Furthermore, samples C to E, which correspond to facial cleansing sheet 1 in this embodiment, have a basis weight of 73 gsm or more and a bending length (stiffness / flexibility) of 2.3 cm or less, and it was confirmed that they maintain strength while having even greater flexibility.

[0069] The bending length (stiffness) of the sheet material can be measured as follows. Figures 6A and 6B illustrate the method for measuring the bending length. First, the sheet material to be measured is cut into multiple rectangular pieces (for example, 6 pieces) of a predetermined size (short side: 25±1 mm × long side: 250±1 mm) to be used as test pieces. Next, the stiffness measuring instrument 200 is prepared. As shown in Figure 6A, the stiffness measuring instrument 200 includes a horizontal base 201 on which the test piece is placed, and an inclined section 202 that slopes diagonally downward from one end 201t in the longitudinal direction of the horizontal base 201. The inclined section 202 has an inclination angle of θ = 41.5 degrees with respect to the horizontal direction. Then, the test specimen is placed on the horizontal table 201 so that its long side is parallel to the longitudinal direction of the horizontal table 201, and one end of the test specimen in the long side direction is aligned with one end 201t in the longitudinal direction of the horizontal table 201, and the test specimen is held down from above with a wooden ruler 205 as shown in Figure 6A.

[0070] From this state, the wooden ruler 205 is lightly pushed from one side to the other in the longitudinal direction of the horizontal table 201, causing the test piece to slide horizontally on the horizontal table 201 at a constant speed (for example, 2 mm / s). As a result, one end of the test piece in the longitudinal direction extends beyond the one end 201t of the horizontal table 201 in the longitudinal direction, and the extended portion deforms under its own weight and comes into contact with the inclined section 202 at a certain point. At this time, the length L (cm) that the wooden ruler 205 has moved horizontally is measured. After measuring the length L, the front and back of the test piece are reversed and the same measurement is performed. This measurement is performed for each of the multiple test pieces, and the bending length (rigidity / flexibility) is defined as the average L' of the measurement values ​​(length L) from the front side and the measurement values ​​(length L) from the back side divided by 2.

[0071] Furthermore, in the facial cleansing sheet 1 of this embodiment, the amount of moisturizing agent applied is preferably 4.8% or more and 11% or less. In Figure 4, samples A and B, with a moisturizing agent application amount less than 4.8%, have a higher surface friction coefficient and higher rigidity compared to samples C to E, which have an application amount of 4.8% or more, making it difficult to produce a facial cleansing sheet with a good feel on the skin. Also, in sample F, with a moisturizing agent application amount greater than 11%, the surface of the sheet becomes fluffier compared to samples C to E, which have an application amount of 11% or less, which tends to reduce the feel and strength of the sheet material. Moreover, if the water repellency increases due to the fluffing of the surface, the water absorption rate decreases, which may make it unsuitable for use during facial cleansing. In contrast, samples C to E, where the amount of moisturizer applied is between 4.8% and 11%, are suitable for use during facial cleansing because they easily achieve sufficient strength while also providing a good feel and water absorption (water retention) compared to the opposite case (where the amount of liquid containing the moisturizer is less than 4.8% and greater than 11%).

[0072] In Figure 4, the fluffiness of the sheet material 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 material (test piece) is rubbed with a predetermined nylon brush or cloth abrasive to remove fluff and pilling, and a visual evaluation of fluffiness and pilling is performed under specified lighting conditions. In Figure 4, sample F, with a liquid coating amount (%) of 15.1%, has a fluffiness grade of 2, while samples A to E, with a liquid coating amount of 11% or less, have fluffiness grades of 3 to 3.5. As mentioned above, in sample F, where the surface fluffiness is large, the strength, texture, and water absorption of the sheet material tend to deteriorate. Therefore, it is preferable that the facial cleansing sheet 1 of this embodiment has a fluffiness grade of 3 or higher according to GB / T 4802.1-2008. This suppresses excessive fluffing on the sheet surface, resulting in a sheet material that is smooth to the touch and has sufficient strength to be more suitable for use during face washing.

[0073] Furthermore, the nonwoven fabric that forms the base of the facial cleansing sheet 1 is mainly composed of hydrophilic, naturally derived fibers. Fibers made from natural fibers tend to have higher water absorption properties compared to fibers made from petrochemical materials such as petroleum, resulting in a nonwoven fabric with good moisture retention and water absorption. In addition, the flexibility of the nonwoven fabric is easily maintained by the absorbed moisture, making it suitable for use on sensitive skin and ideal as a facial cleansing sheet.

[0074] Furthermore, the liquid applied to the facial cleansing sheet 1 contains hydrolyzed hyaluronic acid and centella in addition to moisturizers (see Figure 2). These hydrolyzed hyaluronic acid and centella have the functions of moisturizers and anti-evaporative agents, exhibiting skin-beautifying effects such as suppressing skin dryness and providing elasticity. Therefore, it is possible to create a facial cleansing sheet that not only improves the feel of the skin during cleansing but also provides skin care.

[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 can be practical 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) has sufficient strength (30 N / 50 mm or more) to withstand use as a facial cleanser, while ensuring flexibility and moisturizing properties by containing a medicinal solution such as a moisturizer. Therefore, it is possible to realize a facial cleansing sheet that is tear-resistant while maintaining moisturizing properties and flexibility.

[0076] The tensile strength (N / 50mm) of the sheet material can be measured as follows: First, cut out several test pieces (for example, 3 pieces) of approximately 50mm x 200mm from each sample A to F. Next, place the cut test pieces in the chucks of a tensile testing machine (for example, INSTRON Series 2712 & 2732) and adjust the distance between the chucks to 100mm while keeping the test piece taut. Then, pull the test piece at a pulling speed of 10cm / min to widen the distance between the chucks and record the force (N) at which the test piece breaks. Repeat this measurement for each of the 3 test pieces, and the average value of the force (N) at which the test piece breaks is taken as the tensile strength (N / 50mm).

[0077] Figures 7A to 7C illustrate the appearance of the facial cleansing sheet 1 when stretched in the longitudinal (MD direction) and transverse (CD direction) directions. Figure 7A shows one side of the facial cleansing sheet 1 in the thickness direction and the other side in the thickness direction in its natural state before stretching. As explained in Figure 3, the base material (nonwoven fabric) of the facial cleansing sheet 1 is manufactured by overlapping and integrating a cross web having a fiber orientation inclined with respect to the longitudinal (MD direction) direction and a parallel web having a fiber orientation parallel to the longitudinal (MD direction) direction in the thickness direction. Therefore, Figure 7A shows the state where 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 the state where the fiber orientation on the other side in the thickness direction is parallel to the MD direction (parallel web). However, Figure 7A conceptually represents fiber orientation for illustrative purposes, and in the actual facial cleansing sheet 1 (nonwoven fabric), the fibers are intricately intertwined, so the fiber orientation is not as clearly different on one side and the other side in the thickness direction as shown in Figure 8A.

[0078] Figure 7B shows the state of the facial cleansing sheet 1 shown in Figure 7A when it is pulled in the longitudinal (MD) direction. Here, "pulling in the ~ direction" refers to the state when the sheet is pulled to 1.1 to 1.4 times its original length. For example, in the case of a sheet with a length of 200 mm in the first direction, this represents the state when it is pulled in the first direction until it is approximately 220 mm to 280 mm long. In Figure 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 base material (nonwoven fabric) of the facial cleansing sheet 1. The parallel web, which makes up more than 50% of the base material (nonwoven fabric) of the facial cleansing sheet 1, basically has a fiber orientation parallel to the longitudinal (MD) direction, and is therefore stronger against pulling in the longitudinal (MD) direction compared to the transverse (CD) direction. In fact, referring to the measured tensile strength (N / 50mm) 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 does not stretch as much in the tensile direction (MD direction) compared to when it is pulled in the transverse direction (CD direction) (see Figure 7C described later). As a result, the visible change in one side of the sheet before and after pulling is small.

[0079] Figure 7C shows the state of the facial cleansing sheet 1 in Figure 7A when it is pulled in the transverse direction (CD). In Figure 7C, there is a significant difference in appearance between one side and the other side in the thickness direction. Since both the parallel web and cross web that make up the base material (nonwoven fabric) of the facial cleansing sheet 1 have a weaker tensile strength in the transverse direction (CD direction) than in the longitudinal direction (MD direction), the facial cleansing sheet 1 as a whole is more easily stretched in the transverse direction (CD direction). At this time, on the other side in the thickness direction, as the facial cleansing sheet 1 stretches in the transverse direction (CD direction), multiple wrinkles are formed on the surface of the nonwoven fabric along the transverse direction. In other words, the surface of the nonwoven fabric undergoes uneven deformation in the thickness direction. Multiple wrinkles are also formed on the surface of the nonwoven fabric along the transverse direction on one side in the thickness direction, but the number and size of the wrinkles (unevenness) are smaller than on the other side in the thickness direction.

[0080] Figures 8A and 8B are images of the facial cleansing sheet 1 in the state shown in Figure 7C. Figure 8A is a photographic image corresponding to one side of Figure 7C, and Figure 8B is a photographic image corresponding to the other side of Figure 7C. As shown in Figures 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. However, the number of unevennesses formed per unit area and the height of the unevennesses differ between one side and the other side in the thickness direction. This is because the tensile strength in the lateral direction (CD direction) differs between one side and the other side in the thickness direction.

[0081] Specifically, on one side in the thickness direction, the influence of the cross-web, which has fiber orientation in the longitudinal (MD) direction and the direction of inclination, is significant (see Figure 7A). As a result, a resistance force against tensile force in the transverse (CD) direction acts, suppressing the nonwoven fabric from shrinking in the longitudinal (MD) direction. Therefore, on one side in the thickness direction, the effect of shrinkage in the longitudinal (MD) direction is less pronounced, and wrinkles (unevenness) are less likely to form.

[0082] In contrast, on the other side in the thickness direction, the influence of the parallel web, which has fiber orientation in a direction parallel to the longitudinal direction (MD direction), is greater (see Figure 7A). As a result, resistance to tensile force in the transverse direction (CD direction) is less effective, and the nonwoven fabric tends to shrink in the longitudinal direction (MD direction) as it is pulled in the transverse direction (CD direction). Therefore, on the other side in the thickness direction, the effect of shrinkage in the longitudinal direction (MD direction) is more pronounced, and as the fabric shrinks in the longitudinal direction (MD direction), it deforms in the thickness direction, making it easier for wrinkles (unevenness) to form on the surface.

[0083] Furthermore, since the facial cleansing sheet 1 is coated with a liquid such as a moisturizer, the tensile strength of the nonwoven fabric is weaker compared to when no liquid is applied, making it more prone to stretching in the horizontal direction (CD direction). Therefore, it has a structure that is prone to wrinkle formation when shrinkage occurs in the vertical 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 base material differs between one side and the other side in the thickness direction. With such a configuration, the probability of fibers with different orientations intersecting increases, making it easier to increase the number of fiber entanglements during the manufacturing of the nonwoven fabric and thus increase the overall strength of the nonwoven fabric. Furthermore, because the fiber orientation differs between one side and the other side in the thickness direction, a difference in the direction in which the nonwoven fabric easily bends along those fibers is more likely to occur. In other words, compared to a case where it is only easy to bend in a specific direction, the entire nonwoven fabric is more likely to undergo three-dimensional bending deformation. Therefore, when used for facial cleansing, the nonwoven fabric can freely deform according to the contours of the user's skin, improving the feel against the skin.

[0085] Here, fiber orientation refers to the typical arrangement direction of fibers, as described above, and the state in which "the fiber orientation differs between one side and the other side in the thickness direction" can be identified as follows. First, the face wash sheet 1 is placed on a flat plate with the side to be measured facing upwards, so that no wrinkles are formed on its surface. Next, a magnified image is taken from a direction perpendicular to the measurement surface using a microscope (for example, a scanning electron microscope such as the JCM-5100 manufactured by JEOL Ltd.), printed, and the fibers are traced onto a transparent PET sheet. The magnified image is an image magnified to a magnification that allows for the 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 the nexusNewQube (standalone version) image processing software manufactured by Nexus Corporation. The orientation angle and the orientation intensity, which is the intensity at that orientation angle, are obtained from the binarized image using the Fiber Orientation Analysis 8.13 Single program, which is a fiber orientation analysis program. This measurement is repeated several times (for example, 3 to 5 times), and the average value is calculated. The direction along the orientation angle that yields the greatest orientation strength is then defined as the representative fiber arrangement direction (fiber orientation direction) on the surface being measured.

[0086] Furthermore, if the smaller of the angles between the representative fiber arrangement direction on one side of the thickness direction and the representative fiber arrangement direction on the other side of the thickness direction is greater than 30 degrees, then the fiber orientation is considered to be different. Note that on one side of the thickness direction of the facial cleansing sheet 1, the influence of the cross web is significant, so there may be variations in fiber orientation, making it difficult to settle into a consistent direction. In such cases, the fiber orientation is measured at multiple locations on one side of the thickness direction, and each measurement is compared with the fiber orientation on the other side of the thickness direction. Incidentally, on the other side of the thickness direction of the facial cleansing sheet 1, the influence of the parallel web is significant, so there is less variation in fiber orientation compared to one side of the thickness direction.

[0087] Furthermore, in the facial cleansing sheet 1, the number and height of the irregularities per unit area formed on the surface of the nonwoven fabric when pulled in the vertical direction (MD direction) differ from the number and height of the irregularities per unit area formed on the surface of the nonwoven fabric when pulled in the horizontal direction (CD direction). Specifically, when pulled in the horizontal direction (CD direction), larger irregularities (wrinkles) are more likely to form on the surface of the nonwoven fabric on the other side in the thickness direction (see Figures 7B and 7C). By pulling the nonwoven fabric, such irregularities (wrinkles) are formed on the surface, making it easier to wipe away water droplets and sebum that have adhered to the skin, thus making it a sheet material more suitable for use during facial cleansing.

[0088] Furthermore, when the facial cleansing sheet 1 is pulled in either the vertical (MD direction) or horizontal (CD direction) direction (a direction perpendicular to the typical arrangement direction of the fibers constituting the nonwoven fabric, the horizontal direction in the example above), the number of irregularities per unit area and the height of the irregularities formed on the surface of the nonwoven fabric on one side in the thickness direction differ from those formed on the other side in the thickness direction. Specifically, when pulled in the horizontal direction (CD direction), larger irregularities (wrinkles) are more likely to form on the other side in the thickness direction than on the other side (see Figures 7B and 7C). This makes it easier to distinguish 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. In addition, it is possible to broaden the ways in which the facial cleansing sheet 1 can be used, such as wiping away moisture and sebum with the side where larger irregularities are formed and gently wiping the skin with the side where smaller irregularities are formed.

[0089] Furthermore, regarding the unevenness formed when such a facial cleansing sheet 1 is pulled in the horizontal direction (CD direction), the side with a larger number of unevennesses per unit area and a greater height of unevenness is smaller than the angle between the typical fiber arrangement direction and the vertical direction (MD direction) than the side with a smaller number of unevennesses per unit area and a smaller height of unevenness. In other words, the side on which the fibers are arranged along the vertical direction (MD direction) is more likely to form larger unevenness (wrinkles) than the side on which the fibers are arranged diagonally to the vertical direction (MD direction). This configuration can further improve the ease of use of the facial cleansing sheet 1. For example, after washing one's face and taking out the facial cleansing sheet 1, and after wiping once, pulling the sheet in a direction perpendicular to the fiber orientation direction creates large unevenness (wrinkles) on one side of the sheet. This allows the unevenness (wrinkles) of the sheet to gently contact the skin in areas that could not absorb water when wiping with a smooth, wrinkle-free state, providing sufficient wiping and a gentle wiping sensation with just one sheet. Therefore, it becomes possible for users to use the facial cleansing sheets 1 in a more diverse and user-friendly way.

[0090] Furthermore, when the facial cleansing sheet 1 is pulled in the direction of the fiber orientation, almost no irregularities are formed, and the sheet remains smooth (see Figure 7B). This allows for different uses of the facial cleansing sheet 1 depending on whether you want to use a smooth surface (when wiping areas of the face with few contours) or an irregular surface (when wiping areas of the face with many contours). For example, when removing the facial cleansing sheet 1 from the container or package in which it is contained, aligning the direction in which the sheet is pulled with the direction of the fiber orientation makes it possible to remove and use the sheet while maintaining a surface smoothness and sheet size close to its original state. Conversely, by aligning the direction in which the sheet is pulled with the direction of the fiber orientation when removing it, it becomes possible to actively create irregularities during use.

[0091] ===Other Examples=== While embodiments of the present invention have been described above, these embodiments are intended to facilitate understanding of the present invention and are not intended to limit its interpretation. Furthermore, the present invention can be modified or improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0092] 1. Facial cleansing sheet, 10a Nonwoven fabric sheet, 10c Cross web, 10s Parallel web, 100 Nonwoven fabric manufacturing equipment, 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 instrument, 201 Horizontal base section, 202 Inclined section, 205 Wooden ruler

Claims

1. It has a vertical and horizontal direction that is orthogonal to each other, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. A facial cleansing sheet characterized by having a basis weight of 73 gsm or more, and having a rigidity / softness of 2.5 cm or less in both the vertical and horizontal directions.

2. Having mutually orthogonal vertical and horizontal directions, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. A facial cleansing sheet characterized in that the fiber orientation of the fibers constituting the nonwoven fabric differs between one side and the other side in the thickness direction.

3. Having mutually orthogonal vertical and horizontal directions, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. A facial cleansing sheet characterized in that the amount of the moisturizing agent coated on the nonwoven fabric is 4.8% or more and 11% or less.

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

5. A facial cleansing sheet according to claim 1 or 2, A facial cleansing sheet characterized in that the tensile strength in both the longitudinal and transverse directions is 30 N / 50 mm or more.

6. A facial cleansing sheet according to claim 1 or 2, A facial cleansing sheet characterized by having a grade of 3 or higher according to GB / T 4802.1-2008.

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

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

9. Having mutually orthogonal vertical and horizontal directions, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. The fiber orientation of the fibers constituting the nonwoven fabric differs between one side and the other side in the thickness direction. The number of irregularities per unit area formed on the surface of the facial cleansing sheet when pulled in the vertical direction, and the height of said irregularities, A facial cleansing sheet characterized in that the number of irregularities per unit area formed on the surface of the facial cleansing sheet when pulled in the lateral direction and the height of said irregularities are different.

10. It has a vertical and horizontal direction that is orthogonal to each other, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. When pulled in either the vertical or horizontal direction, The number of irregularities per unit area formed on one side of the thickness direction of the facial cleansing sheet and the height of said irregularities, The number of irregularities per unit area formed on the other side of the thickness direction of the facial cleansing sheet and the height of said irregularities, A facial cleansing sheet characterized by having different properties.

11. A facial cleansing sheet according to claim 10, The fiber orientation of the fibers constituting the nonwoven fabric differs between one side and the other side in the thickness direction. When pulled in the aforementioned lateral direction, The number of the aforementioned irregularities per unit area and the angle between the fiber orientation direction and the longitudinal direction on the side where the height of the irregularities is greater are, A facial cleansing sheet characterized in that the number of irregularities per unit area and the angle between the fiber orientation direction and the longitudinal direction on the side where the height of the irregularities is small are smaller than the number of irregularities per unit area and the angle between the fiber orientation direction and the longitudinal direction on the side where the height of the irregularities is small.

12. A facial cleansing sheet according to claim 9 or 10, When the nonwoven fabric is pulled in a direction along the fiber orientation direction of the fibers constituting the nonwoven fabric, A facial cleansing sheet characterized in that it is designed to maintain a smooth state without forming the aforementioned irregularities.

13. A facial cleansing sheet according to claim 1 or 2, A facial cleansing sheet characterized in that the aforementioned plurality of fibers consist solely of hydrophilic fibers.

14. A facial cleansing sheet according to claim 13, A facial cleansing sheet characterized in that the hydrophilic fiber is cotton fiber, silk fiber, hemp fiber, rayon fiber, or lyocell fiber.

15. A facial cleansing sheet according to claim 13, The facial cleansing sheet is characterized in that the hydrophilic fiber is a rayon fiber.

16. Having mutually orthogonal vertical and horizontal directions, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. The fiber orientation direction on the other side in the thickness direction is along one of the longitudinal direction and the transverse direction. The fiber orientation direction on one side in the thickness direction is oblique to the aforementioned one direction. The aforementioned facial cleansing sheet is housed in a container, A facial cleansing sheet characterized in that the direction in which the facial cleansing sheet is pulled when it is removed from the container is one of the aforementioned directions.

17. Having mutually orthogonal vertical and horizontal directions, A facial cleansing sheet made of a nonwoven fabric in which multiple fibers are intertwined, Before wiping off the moisture after washing your face, your skin is dry, and during wiping, it becomes wet. The aforementioned nonwoven fabric has a single-layer structure and contains a humectant. The average values ​​of the surface friction coefficients in the longitudinal and transverse directions are both 0.18 or less. The fiber orientation direction on the other side in the thickness direction is along one of the longitudinal direction and the transverse direction. The fiber orientation direction on one side in the thickness direction is oblique to the aforementioned one direction. The aforementioned facial cleansing sheet is housed in a container, A facial cleansing sheet characterized in that the direction in which the facial cleansing sheet is pulled when it is removed from the container is perpendicular to the one direction.

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