Sheet for cleaning face

Abstract

Provided is a cleansing sheet having improved strength, softness, and moisture retention. The cleansing sheet (1) has a longitudinal direction and a transverse direction and is composed of a non-woven fabric formed by interweaving a plurality of fibers, the non-woven fabric has a single-layer structure and contains a humectant, and the average value of the surface friction coefficient in each of the longitudinal direction and the transverse direction is 0.18 or less.

Description

Technical Field

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

[0002] In the past, sheet members such as nonwoven fabrics and paper towels have been known to have improved softness and moisturizing properties so as to be suitable for use when washing the face. For example, Patent Document 1 discloses a technology involving tissue paper having a three-layer or four-layer laminated structure, and by applying a moisturizing material to each layer, the necessary softness is ensured while reducing the stickiness of the outer surface.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-61414 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In a sheet member having a multi-layered structure such as Patent Document 1, there is a risk that when used for facial cleansing, the layers are easily peeled off and the overall strength is insufficient. On the other hand, it is common that if an attempt is made to improve the strength using existing sheet members, the softness becomes insufficient. Furthermore, it is difficult to improve the moisturizing property in a balanced manner on the basis of strength and softness in order to be suitable for facial cleansing.

[0008] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a facial cleansing sheet having improved strength, softness and moisturizing properties.

[0009] Solutions for solving problems

[0010] The main technical solution for achieving the above-mentioned purpose is a facial cleansing sheet, which has mutually orthogonal longitudinal and transverse directions and is composed of a non-woven fabric formed by interweaving multiple fibers. The characteristic is that the non-woven fabric is a single-layer structure and contains a moisturizer, and the average value of the surface friction coefficient in each direction of the longitudinal direction and the transverse direction is less than 0.18.

[0011] Other features of the present invention will be clarified through description in this specification and the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, a facial cleansing sheet having improved strength, softness and moisturizing properties can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of the facial cleansing sheet 1 .

[0015] Figure 2 1 is a flowchart showing a method for producing the facial cleansing sheet 1 .

[0016] Figure 3 This is a diagram for explaining a nonwoven fabric manufacturing apparatus 100 for forming a nonwoven fabric serving as a base material of the face cleansing sheet 1 .

[0017] Figure 4 This is a table explaining the functional evaluation data of the face cleansing sheet 1.

[0018] Figure 5 This is a graph showing the relationship between the amount of liquid applied and the surface friction coefficient (MD direction and CD direction).

[0019] Fig. 6A and Figure 6B This is a diagram for explaining the method of measuring the bending length.

[0020] Figure 7A to Figure 7C This is a diagram for explaining the state when the face cleansing sheet 1 is stretched in the longitudinal direction (MD direction) and the transverse direction (CD direction).

[0021] Fig. 8A and Figure 8B Yes Figure 7C An image obtained by photographing the face cleansing sheet 1 in a state of.

[0022] Description of Reference Numerals

[0023] 1. facial cleansing sheet; 10a. nonwoven fabric sheet; 10c. cross-woven sheet; 10s. parallel-woven sheet; 100. nonwoven fabric manufacturing device; 105. conveying mechanism; 110. combing mechanism; 110A. cross-woven sheet combing mechanism; 110B. parallel-woven sheet combing mechanism; 120. high-pressure water flow mechanism; 130. drying mechanism; 140. winding mechanism; 200. stiffness measuring device; 201. horizontal platform portion; 202. inclined portion; 205. wooden ruler. DETAILED DESCRIPTION

[0024] At least the following matters are clarified from the description of this specification and the drawings.

[0025] (Method 1)

[0026] A facial cleansing sheet having mutually orthogonal longitudinal and transverse directions and being composed of a nonwoven fabric formed by interweaving a plurality of fibers, characterized in that the nonwoven fabric is a single-layer structure and contains a moisturizer, and the average value of the surface friction coefficient in each direction of the longitudinal direction and the transverse direction is less than 0.18.

[0027] According to the facial cleansing sheet of mode 1, by being composed of a nonwoven fabric of a single-layer structure, it is not easy to peel off between layers when wiping the face, so that it is easy to ensure strength. In addition, by containing a moisturizer, the moisturizing property is improved, and by being easy to retain moisture, it is easy to maintain softness. In addition, by making the surface friction coefficient (average value) less than 0.18, the skin touch when in contact with the face becomes smoother compared to the opposite situation, and the user can easily feel softness. Thus, a facial cleansing sheet with improved strength, softness and moisturizing property can be provided.

[0028] (Method 2)

[0029] The facial cleansing sheet according to aspect 1, wherein the weight per unit area is 73 gsm or more, and the stiffness in each of the longitudinal direction and the transverse direction is 2.5 cm or less.

[0030] According to the facial cleansing sheet of aspect 2, it is possible to ensure strength and softness sufficient to withstand use as a facial cleansing sheet.

[0031] (Method 3)

[0032] In the face cleansing sheet according to aspect 1 or 2, the fibers constituting the nonwoven fabric have fiber orientations that are different between one side and the other side in the thickness direction.

[0033] According to the facial cleansing sheet of embodiment 3, the probability of fibers having different orientations crossing each other increases, and the number of interlaced portions of the fibers increases when manufacturing the nonwoven fabric, thereby facilitating the improvement of the strength of the nonwoven fabric as a whole. In addition, by making the fiber orientation different on one side and the other side in the thickness direction, the nonwoven fabric as a whole is easily deformed in three dimensions, and when used for facial cleansing, the nonwoven fabric can be deformed freely according to the unevenness of the user's skin, thereby improving the skin feel.

[0034] (Method 4)

[0035] In the facial cleansing sheet according to any one of aspects 1 to 3, the amount of the moisturizing agent applied to the nonwoven fabric is 4.8% or more and 11% or less.

[0036] According to the facial cleansing sheet of mode 4, if the amount of moisturizer applied is less than 4.8%, the surface friction coefficient is large and the stiffness is high, and the skin feel is likely to be poor. On the other hand, if the amount of moisturizer applied is greater than 11%, the fluffing on the sheet surface is more serious, the skin feel and strength of the sheet member are likely to be reduced, the waterproofness is increased and the water absorption rate is likely to be reduced. Therefore, by making the amount of moisturizer applied be 4.8% or more and 11% or less, it has sufficient strength compared to the opposite case, and it is easy to achieve good skin feel and water absorption (water retention).

[0037] (Method 5)

[0038] In the facial cleansing sheet according to any one of aspects 1 to 4, the fibers constituting the nonwoven fabric are mainly composed of a hydrophilic natural-origin material.

[0039] According to the facial cleansing sheet of embodiment 5, the fibers mainly composed of hydrophilic natural materials can easily improve the water absorption of the fibers themselves compared with the fibers composed of petrochemical materials such as petroleum, so that a sheet with good moisture retention and water absorption can be formed. In addition, it is easy to maintain the softness of the nonwoven fabric by using the absorbed water, so it is suitable for use on sensitive skin and is suitable as a facial cleansing sheet.

[0040] (Method 6)

[0041] In the facial cleansing sheet according to any one of aspects 1 to 5, the tensile strength in each of the longitudinal direction and the transverse direction is 30 N / 50 mm or more.

[0042] According to the facial cleansing sheet of embodiment 6, softness and moisturizing properties are ensured by containing a liquid such as a moisturizer, and the facial cleansing sheet has sufficient strength (30N / 50mm or more) to at least withstand use as a facial cleansing sheet. Therefore, a facial cleansing sheet that is not easily torn while maintaining moisturizing properties and softness can be realized.

[0043] (Method 7)

[0044] The facial cleansing sheet according to any one of aspects 1 to 6, wherein the grade according to GB / T4802.1-2008 is 3 or higher.

[0045] According to the facial cleansing sheet of aspect 7, excessive fluffing on the sheet surface can be suppressed, and a facial cleansing sheet which is smooth to the touch and not too weak in strength and more suitable for use when cleansing the face can be realized.

[0046] (Method 8)

[0047] 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 asiatica.

[0048] According to the facial cleansing sheet of embodiment 8, by containing hydrolyzed hyaluronic acid and Centella asiatica having functions as a moisturizer and an anti-gassing agent, it is easy to exhibit skin beautifying effects such as suppressing skin dryness and providing elasticity. Therefore, a facial cleansing sheet that can provide skin care while making the skin feel good during face cleansing can be realized.

[0049] (Method 9)

[0050] In the face cleansing sheet according to any one of aspects 1 to 8, the fibers constituting the nonwoven fabric have fiber orientations that are different between one side and the other side in the thickness direction.

[0051] According to the facial cleansing sheet of mode 9, the probability of fibers with different orientations crossing each other is high, and the number of interlaced parts of the fibers increases, thereby easily improving the strength of the nonwoven fabric as a whole. In addition, by making the fiber orientation different on one side and the other side in the thickness direction, it is easy to produce a difference in the direction in which the nonwoven fabric is easy to bend along the fibers, and the nonwoven fabric as a whole is easy to bend and deform in three dimensions. Therefore, when used for facial cleansing, the nonwoven fabric can be freely deformed according to the unevenness of the user's skin, thereby improving the skin touch.

[0052] (Method 10)

[0053] For the facial cleansing sheet described in any one of methods 1 to 9, the number of concave-convex shapes per unit area and the height of the concave-convex shapes formed on the surface of the facial cleansing sheet when stretched along the longitudinal direction are different from the number of concave-convex shapes per unit area and the height of the concave-convex shapes formed on the surface of the facial cleansing sheet when stretched along the transverse direction.

[0054] According to the facial cleansing sheet of aspect 10, the surface has irregularities (wrinkles) formed by stretching in any direction, and water droplets, sebum, etc. attached to the skin can be easily wiped off by utilizing the irregularities, so that a sheet member more suitable for facial cleansing can be formed.

[0055] (Method 11)

[0056] A facial cleansing sheet having a longitudinal direction and a transverse direction that are orthogonal to each other and composed of a nonwoven fabric in which a plurality of fibers are interwoven, characterized in that the nonwoven fabric is a single-layer structure and contains a moisturizer, and when stretched along either the longitudinal direction or the transverse direction, the number of projections and depressions per unit area formed on one side of the face in the thickness direction of the facial cleansing sheet and the height of the projections and depressions are different from the number of projections and depressions 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 projections and depressions.

[0057] According to the facial cleansing sheet of embodiment 11, it is easy to distinguish the front and back sides according to the size of the concavoconvexities, so that the user can efficiently use both sides of the facial cleansing sheet when cleansing the face. In addition, the usage of the facial cleansing sheet can be expanded: using the side with larger concavoconvexities to wipe off moisture and sebum, and using the side with smaller concavoconvexities to gently wipe the skin, etc.

[0058] (Method 12)

[0059] For the facial cleansing sheet described in method 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 stretched along the transverse direction, the angle formed by the fiber orientation direction of the surface on the side where the number of the bumps per unit area and the height of the bumps are larger and the longitudinal direction is smaller than the angle formed by the fiber orientation direction of the surface on the side where the number of the bumps per unit area and the height of the bumps are smaller and the longitudinal direction.

[0060] According to the facial cleansing sheet of mode 12, the following usage method can be achieved: after taking out the sheet after cleansing and wiping for the first time, the sheet is stretched to generate irregularities (wrinkles) on one side, thereby making it possible to make the irregularities (wrinkles) of the sheet gently contact the skin with respect to the part that cannot absorb water when wiping in a smooth state without irregularities (wrinkles), so that sufficient wiping and a gentle wiping feeling can be felt with one sheet. Therefore, the user can easily use the facial cleansing sheet in a more diverse manner.

[0061] (Method 13)

[0062] In the facial cleansing sheet according to aspect 11 or 12, when the nonwoven fabric is stretched in a direction along the fiber orientation direction of the fibers constituting the nonwoven fabric, the irregularities are not formed and the nonwoven fabric remains smooth.

[0063] According to the facial cleansing sheet of method 13, the facial cleansing sheet 1 can be used separately according to the situation where the facial cleansing sheet 1 is to be used with a smooth surface (when wiping a facial area with less undulations) and the situation where the facial cleansing sheet 1 is to be used with a surface having irregularities (when wiping a facial area with more undulations).

[0064] ===Implementation Method===

[0065] Hereinafter, the embodiment will be described by taking the facial cleansing sheet 1 as an example of a sheet member suitable for facial cleansing of the present invention. However, the facial cleansing sheet 1 of the present invention can also be used for purposes other than facial cleansing (eg, makeup, skin care, etc.).

[0066] <Basic structure of facial cleansing sheet 1>

[0067] Figure 1 1 is a perspective view of a facial cleansing sheet 1. Figure 1 As shown, the facial cleansing sheet 1 is a rectangular sheet member having a "longitudinal direction" (equivalent to the "MD direction" described later), a "transverse direction" (equivalent to the "CD direction" described later), and a "thickness direction" that are orthogonal to each other. In this embodiment, the dimensions of the facial cleansing sheet 1 are set as follows: longitudinal direction = 200 mm, transverse direction = 220 mm, and thickness direction = about 0.5 mm. However, each dimension can be appropriately changed, and the shape of the sheet member is not limited to a rectangular shape.

[0068] The facial cleansing sheet 1 is a dry sheet member obtained by drying a sheet obtained by applying a predetermined liquid to a nonwoven fabric as a substrate. By making the facial cleansing sheet 1 a sheet in a dry state rather than a wet state, it is suitable for wiping off moisture when the body is wetted by face washing, etc. In addition, it is possible to avoid wiping with an unhygienic towel after face washing, and the skin can be kept in a cleaner state. On the other hand, although the facial cleansing sheet 1 is in a dry state before wiping, it will become a wet state during use, so a certain degree of strength is also required. In addition, although the main use is wiping after face washing, it can also be used for wiping hands and mouths, etc. In addition, a plurality of facial cleansing sheets 1 are overlapped in a folded state (for example, a folded state), and are circulated on the market as a package (not shown) encapsulated by a predetermined package composed of a resin sheet, etc.

[0069] The substrate constituting the facial cleansing sheet 1 is a nonwoven fabric of a single-layer structure formed by interweaving a plurality of fibers, such as a spunlace nonwoven fabric. The fibers used in the nonwoven fabric are mainly fibers composed of hydrophilic natural source materials, such as natural source fibers of fibrous cellulose such as cotton, silk, and hemp, and more preferably, semi-synthetic fibers such as rayon fibers and lyocell can be used. In addition, the nonwoven fabric (substrate) used in the facial cleansing sheet 1 of the present embodiment has fiber orientation in more than two directions, and the details will be described later. That is, the arrangement direction of the fibers constituting the nonwoven fabric is at least in more than two directions. In addition, "fiber orientation" refers to the representative arrangement direction of the fibers constituting the nonwoven fabric.

[0070] In addition, "single-layer structure" does not mean a structure in which multiple sheets of laminated materials such as tissue paper can be separated from each other, but means a structure in which the layers cannot be separated. In this embodiment, a spunlace nonwoven fabric formed by interweaving the fibers in the woven sheet with high-pressure water flow is used as the base material (described later). Therefore, it becomes a structure in which the interweaving of the fibers cannot be separated to separate into two or more layers, or the layers cannot be peeled off in the thickness direction.

[0071] In the present embodiment, will be mixed in the water (H2O) as solvent and added one or more in the wetting agent composition, the softener composition such as glycerol, sorbitol, polyquaternium salt, and further contain one or more in the skin beautifying composition (skin care composition) such as hyaluronic acid, Centella asiatica and obtain liquid (medicinal liquid) and be coated on the nonwoven fabric as base material.By coating the liquid containing these compositions and drying, improve the softness, the moisture retention of the nonwoven fabric as base material.In addition, because these compositions all have the function as wetting agent, therefore are the wetting agent in a broad sense in this manual.In addition, the function of each composition is not limited to a kind of, for example, polyquaternium salt plays a role as wetting agent and softener, and hyaluronic acid also plays a role as softener and skin beautifying composition.

[0072] By including such a liquid, the softness and moisturizing properties of the nonwoven fabric as the base material can be improved, the skin feel can be smooth when used (when washing the face), and the needs of users (users) who attach importance to skin care can be met. Among them, as long as the liquid contains a moisturizer, a softener and a skin-beautifying / skin-care ingredient in a solvent, it is not limited to the above ingredients, and the type and content of the ingredients contained in the liquid can also be appropriately changed.

[0073] <Method for producing facial cleansing sheet 1>

[0074] Next, the outline of the method for producing the facial cleansing sheet 1 will be described. Figure 2 The flowchart of the manufacturing method of the face cleansing sheet 1 is shown. When manufacturing the face cleansing sheet 1, first, a nonwoven fabric forming step (S101) of forming a nonwoven fabric serving as a base material is performed.

[0075] Figure 3 1 is a diagram for explaining a nonwoven fabric manufacturing apparatus 100 for forming a nonwoven fabric that becomes a base material of a facial cleansing sheet 1. The nonwoven fabric manufacturing apparatus 100 includes a conveying mechanism 105, a combing 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 woven sheet composed of raw material fibers, and forms a nonwoven fabric (base material) while conveying the woven sheet in a predetermined conveying direction using a conveying mechanism 105 such as a belt conveyor. Hereinafter, the conveying direction for conveying the woven sheet will also be referred to as the "MD direction", and the direction perpendicular to the conveying direction on the horizontal plane (in the direction of the conveying direction) will also be referred to as the "MD direction". Figure 3 The MD direction is equivalent to Figure 1 The longitudinal direction is the same as the CD direction. Figure 1 The direction of the horizontal direction.

[0076] When manufacturing nonwoven fabrics, first, raw cotton (here, raw cotton made of 100% rayon) that will be the raw material of the nonwoven fabric is fed into the carding mechanism 110. In the carding mechanism 110, the bulky raw cotton is untied to make the fibers uniform while passing through a plurality of rollers, thereby forming a sheet (flat shape). Figure 3 In the embodiment, two types of combing mechanisms, namely, a cross-sheet combing mechanism 110A and a parallel-sheet combing mechanism 110B, are provided as the combing mechanism 110. The cross-sheet combing mechanism 110A is a so-called cross-laying mechanism that continuously forms a woven sheet having fiber orientation in a direction inclined relative to the MD direction. The parallel-sheet combing mechanism 110B is a mechanism that continuously forms a woven sheet having fiber orientation in a direction along the MD direction.

[0077] In this embodiment, raw cotton is fed into the cross-weaving sheet carding mechanism 110A and the parallel-weaving sheet carding mechanism 110B respectively to form two kinds of woven sheets. The fibers of the cross-weaving sheet 10c formed by the cross-weaving sheet carding mechanism 110A are arranged in a direction obliquely intersecting with respect to the MD direction (in the direction of the MD). Figure 3 On the other hand, the fibers of the parallel woven sheet 10s formed by the parallel woven sheet combing mechanism 110B are arranged in a direction parallel to the MD direction. In addition, when comparing the unit area weights of the cross woven sheet 10c and the parallel woven sheet 10s, it is preferred that the unit area weight of the parallel woven sheet 10s is relatively small. The formed continuum of the cross woven sheet 10c and the parallel woven sheet 10s is respectively transported to the downstream side in the MD direction by the transport mechanism 105.

[0078] The continuum of the cross-woven sheet 10c and the parallel-woven sheet 10s overlaps in the thickness direction while being transported to the downstream side in the MD direction, and is supplied to the high-pressure water flow mechanism 120. Then, the high-pressure water flow mechanism 120 sprays a high-pressure water flow in the thickness direction, and the pressure of the sprayed water flow is used to interweave the fibers with each other, thereby forming a sheet-shaped non-woven fabric. In the present embodiment, the parallel-woven sheet 10s and the cross-woven sheet 10c overlap in the thickness direction, and the fibers are interwoven and integrated with each other, thereby forming a continuum of a single-layer non-woven fabric sheet 10a. The non-woven fabric sheet 10a thus formed is a single-layer structure, but has different fiber orientations on one side and the other side in the thickness direction. In the present embodiment, the parallel-woven sheet 10s and the cross-woven sheet 10c overlap in the thickness direction, and the fibers are interwoven and integrated with each other, thereby forming a single-layer non-woven fabric sheet 10a. The non-woven fabric sheet 10a thus formed is a single-layer structure, but has different fiber orientations on one side and the other side in the thickness direction. Figure 3 In the case of , the nonwoven fabric has a fiber orientation inclined with respect to the MD direction on one side in the thickness direction and a fiber orientation along the MD direction on the other side in the thickness direction.

[0079] Next, the nonwoven fabric sheet 10a is conveyed to the downstream side in the MD direction and supplied to the drying mechanism 130. In the drying mechanism 130, water contained in the nonwoven fabric sheet 10a is removed and dried, thereby forming a stable sheet-shaped nonwoven fabric.

[0080] Finally, the nonwoven fabric sheet 10a continuous in the MD direction is wound into a roll shape by the winding mechanism 140. Figure 2 When the nonwoven fabric forming step ( S101 ) and the liquid applying step ( S102 ) which is the next step are performed on the same production line, the winding mechanism 140 may not necessarily be used for winding.

[0081] return Figure 2 After forming a nonwoven fabric as a substrate in the nonwoven fabric forming step (S101), a liquid coating step (S102) is performed to coat (apply) a liquid to the nonwoven fabric (substrate). In the liquid coating step, the liquid is sprayed in the thickness direction from a spraying device (not shown) disposed at a predetermined position in the MD direction to a continuous body of the nonwoven fabric sheet 10a that is released from the nonwoven fabric sheet 10a wound into a roll and transported in the MD direction (transport direction). Thus, the liquid containing a moisturizer and a softener is coated (applied) over the entire continuous body of the nonwoven fabric sheet 10a.

[0082] After the nonwoven fabric sheet 10a continuous body coated with the liquid is dried while being conveyed in the MD direction, a cutting process (S103) is performed to cut it into a predetermined size. In the cutting process, a cutting device (not shown) set at a predetermined position in the MD direction is used to cut the nonwoven fabric sheet 10a continuous body at a predetermined interval (for example, 200 mm interval) along the MD direction, thereby forming a facial cleansing sheet 1 one by one.

[0083] The facial cleansing sheet 1 cut into a predetermined size is folded along the MD direction or CD direction (S104), and a plurality of sheets are packaged in a predetermined packaging material (not shown) (S105), shipped as a package of facial cleansing sheets 1, and distributed on the market.

[0084] <Functional evaluation of facial cleansing sheet 1>

[0085] Next, specific functions of the facial cleansing sheet 1 according to the present embodiment will be described. Figure 4 This is a table explaining the functional evaluation data of the facial cleansing sheet 1. Figure 4The following results are shown in the table: The surface friction coefficient, bending length, tensile strength and fuzzing level of six samples A to F with different amounts of moisturizing agent applied to the same substrate (nonwoven fabric) as the substrate (nonwoven fabric) constituting the facial cleansing sheet 1 were measured. The amount of moisturizing agent applied to the nonwoven fabric sheet (%) is the value obtained by dividing the weight of the moisturizing agent contained in the nonwoven fabric sheet of the target product by the weight of the substrate (nonwoven fabric) not containing 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 (a sample that has been left to stand in a constant temperature and humidity chamber at 20°C and 60% RH (relative humidity) for more than 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 with a dryer. Similarly, the sample was left to stand in a constant temperature and humidity room for more than 8 hours, and the weight of the sample was measured as the weight of the substrate (nonwoven fabric) without the moisturizer. (3): The weight of the moisturizer in the cleansing sheet was calculated based on the difference between the weights of (1) and (2), and the weight of the moisturizer was divided by the weight of the substrate (nonwoven fabric) without the moisturizer to obtain the moisturizer application amount (%).

[0086] In addition, Figure 4 In the present invention, the data obtained by measuring the surface friction coefficient of two types of dry paper towels currently available on the market (containing a moisturizer, but the amount of the moisturizer applied is unknown) are shown as Comparative Examples 1 and 2.

[0087] exist Figure 4 Among the six samples A to F shown, three of sample C (moisturizing agent application amount = 4.8%), sample D (moisturizing agent application amount = 7.6%), and sample E (moisturizing agent application amount = 11.0%) correspond to the facial cleansing sheet 1 of the present embodiment. Sample A (moisturizing agent application amount = 0%) represents a substrate (nonwoven fabric) in a state where no moisturizer is applied. In addition, sample B (moisturizing agent application amount = 3.8%) represents a case where the moisturizing agent application amount (%) is less than the facial cleansing sheet 1 of the present embodiment, and sample F (moisturizing agent application amount = 15.1%) represents a case where the moisturizing agent application amount (%) is greater than the facial cleansing sheet 1 of the present embodiment.

[0088] First, let's look at the surface friction coefficient (MIU) of the sheet member. The surface friction coefficient (MIU) represents the friction coefficient of the contact surface when an object and a sheet member are in contact. It is a value that is an indicator of the smoothness felt when the surface of an object is rubbed. For example, when a sample sheet member (non-woven fabric) is placed on human skin and rubbed, the smaller the MIU, the smoother it feels and the better the skin feels. On the other hand, if the MIU is large, the hardness of the sheet will be felt, the skin feel will deteriorate, and discomfort will easily occur.

[0089] The measurement of the surface friction coefficient is carried out as described below. First, the sheet member to be measured is cut into a predetermined size (200 mm long × 200 mm wide, thickness is set to less than 2 mm) as a test piece. Next, the power of the tester (for example, surface tester manufactured by Kado Technology Co., Ltd.: Model KES-FB4-A) is turned on and preheated for 15 minutes. Then, the OSC oscillation voltage, BAL balance, and ZERO zero position are confirmed through the "CHECK (check)" option on the host, and the "SENS (sensing)" range is checked to see if it is within the specified range, and the knob is moved to the "MES (measurement)" test state. Then, press the test piece with both hands until the red light on the test bench lights up. Next, press the "MEASURE (measurement)" button, wait for "MEASURE (measurement)" and other flashes, and then start the computer operation to track and record the real-time test curve of the sample. The moving speed of the test piece is set to 1.0 mm / sec. Repeat this measurement many times (for example, 10 times), and the average value is set as the surface friction coefficient (MIU).

[0090] Figure 5 This is a graph showing the relationship between the amount of liquid applied and the surface friction coefficient (MD direction and CD direction). Figure 5 The surface friction coefficient (MIU) in the MD direction (longitudinal direction) and the CD direction (cross direction) are plotted for each sample A to F. The surface friction coefficient (MIU) is the average value of the surface friction coefficient measured by the above test method.

[0091] In both the MD direction and the CD direction, the surface friction coefficient of sample A with a moisturizing agent application amount of 0% was the largest, and the surface friction coefficients of samples B to F with moisturizing agents applied were smaller than that of sample A. Therefore, it was confirmed that the surface of the nonwoven fabric (substrate) became smoother to the touch by applying a liquid such as a moisturizing agent to the nonwoven fabric (substrate).

[0092] In addition, in the CD direction, as the amount of moisturizer applied increases, the surface friction coefficient gradually decreases (refer to samples B to E). This is believed to be because: by containing the moisturizer, moisture is easily retained in the non-woven fabric, and the softness of the fiber is correspondingly increased, thereby reducing friction. On the other hand, in sample F with a larger amount of moisturizer applied (liquid application amount = 15.1%), the surface friction coefficient becomes larger. This is believed to be because: the impregnation rate of liquids such as moisturizers is too high, thereby reducing the stiffness of the non-woven fabric and making the fibers easy to fluff, thereby increasing friction. Figure 4 The fuzzing photograph also clearly shows the fuzzing of the fibers on the surface of sample F.

[0093] In addition, a sensory test was conducted on the skin feel of samples A to F and comparative examples 1 and 2. In the sensory test, multiple (e.g., 30) testers were asked to wipe their faces along the MD direction and CD direction of each sample and comparative example, and the skin feel at this time was set to 0 when more than 70% of the testers felt good. As a result, with respect to the MD direction, samples B to F were 0, and sample A was ×. With respect to the CD direction, samples C to E were 0, and samples A, B, and F were ×. Therefore, the following was confirmed: if at least the surface friction coefficient is 0.18 (the surface friction coefficient in the CD direction of sample C) or less, the user can feel a good skin feel.

[0094] In Comparative Examples 1 and 2 (conventional commercially available paper towels), the measured values ​​of the surface friction coefficients in the MD direction and the CD direction were both 0.24 or more, and the results of the sensory test conducted by the above method were all negative.

[0095] Therefore, in the facial cleansing sheet 1 having a single-layer nonwoven fabric as a base material and containing a liquid such as a moisturizer, the average value of the surface friction coefficient in each of the MD direction (longitudinal direction) and the CD direction (crosswise direction) is preferably 0.18 or less.

[0096] In a sheet member formed by stacking a plurality of sheets in the thickness direction, such as an existing paper towel, interlayer peeling occurs when wiping the face, and the sheets peel off from each other, making it difficult to ensure strength. In contrast, the facial cleansing sheet 1 is composed of a single-layer nonwoven fabric, so that interlayer peeling is not likely to occur when wiping the face, and it is easy to ensure strength. In addition, the nonwoven fabric is provided with a moisturizing agent to improve the moisture retention, and the softness is easily maintained by being easy to retain moisture. In addition, by making the surface friction coefficient (average value) less than 0.18, the skin touch when in contact with the face becomes smoother compared to the opposite case, and the user can easily feel the softness. In this way, a facial cleansing sheet with improved strength, softness and moisture retention can be achieved.

[0097] Next, let’s focus on the rigidity of the sheet member. Figure 4 The unit area weight and bending length shown in the table are studied. Here, "unit area weight (gsm)" represents the weight (g) per unit area (1 square meter) of the sheet member. Under normal circumstances, the smaller the unit area weight, the thinner the sheet member can be and the smaller the rigidity, but if the unit area weight is too small, it is difficult to ensure the strength of the sheet member. In addition, "bending length (cm)" is an indicator of the stiffness of the sheet member, and the shorter the bending length, the lower the stiffness (higher the softness) of the sheet member.

[0098] exist Figure 4Among them, the unit area weight of samples B to F containing liquids such as moisturizers is 73gsm or more, which is larger than the unit area weight of sample A without moisturizer, which is 67gsm. In addition, the bending length of samples B to F containing liquids such as moisturizers is less than 2.5cm in the MD direction and less than 1.4cm in the CD direction. In contrast, the bending length of sample A without moisturizer is 2.8cm in the MD direction and 1.6cm in the CD direction. That is to say, in samples B to F, by containing a moisturizer in the non-woven fabric as the substrate, the unit area weight is larger and the bending length is shorter than when no moisturizer is contained. In other words, by containing a moisturizer in a substrate (non-woven fabric) with a predetermined unit area weight, the strength of the sheet member can be ensured, and the softness can be improved (the stiffness can be reduced).

[0099] Figure 4 The weight per unit area of ​​samples B to F is at least 73 gsm, and the bending length (stiffness) in the MD direction (longitudinal direction) and the CD direction (transverse direction) is 2.5 cm or less. It is known that if such a structure is adopted, the strength and softness that can withstand the use as a facial cleansing sheet (for example, the use in the above-mentioned sensory test) can be ensured. It is also confirmed that the weight per unit area of ​​samples C to E corresponding to the facial cleansing sheet 1 of this embodiment is 73 gsm or more, and the bending length (stiffness) is 2.3 cm or less, and the softness is further improved while maintaining the strength.

[0100] Furthermore, the bending length (stiffness) of the sheet member can be measured as described below. Fig. 6A and Figure 6B This is a diagram for explaining the method of measuring the bending length. First, the sheet member to be measured is cut into multiple pieces (for example, 6 pieces) of a predetermined rectangular shape (short side: 25±1mm×long side: 250±1mm) as test pieces. Next, prepare a stiffness measuring instrument 200. Fig. 6A As shown, the stiffness measuring device 200 comprises: a horizontal platform portion 201 on which a test piece is placed; and an inclined portion 202 which is inclined obliquely downward from an end portion 201t on one side in the long side direction of the horizontal platform portion 201. The inclined portion 202 has an inclination angle of θ=41.5 degrees relative to the horizontal direction. Then, the test piece is placed on the horizontal platform portion 201 in such a manner that the long side of the test piece is parallel to the long side direction of the horizontal platform portion 201, and the end portion on one side in the long side direction of the test piece is aligned with the end portion 201t on one side in the long side direction of the horizontal platform portion 201, as shown in FIG. Fig. 6A In this way, the test piece is pressed down by the wooden ruler 205 from the upper side.

[0101] From this state, the wooden ruler 205 is gently pressed from the other side to one side in the long side direction of the horizontal platform part 201, so that the test piece moves horizontally at a certain speed (for example, 2 mm / s) in a manner of sliding on the horizontal platform part 201. As a result, the end of one side in the long side direction of the test piece extends from the end 201t of one side in the long side direction of the horizontal platform part 201, and the extended part is deformed due to its own weight and contacts the inclined part 202 at a certain moment. At this time, the length L (cm) of the horizontal movement of the wooden ruler 205 is measured. After measuring the length L, the front and back sides of the test piece are replaced and the same measurement is performed. This measurement is performed on multiple test pieces respectively, and the average L′ of the measured value (length L) on the front side and the measured value (length L) on the back side is divided by 2 to obtain the size obtained as the bending length (stiffness).

[0102] In the facial cleansing sheet 1 of the present embodiment, it is preferred that the amount of the moisturizer applied is 4.8% or more and 11% or less. Figure 4 Among them, in samples A and B with a moisturizer application amount less than 4.8%, the surface friction coefficient is larger and the stiffness is also higher than that of samples C to E with an application amount of more than 4.8%, so it is difficult to become a cleansing sheet with good skin feel. In addition, in sample F with a moisturizer application amount greater than 11%, the fluffing on the sheet surface is more serious than that of samples C to E with an application amount of less than 11%, and the skin feel and strength of the sheet member are easily reduced. In addition, if the waterproofness is increased due to the surface fluffing, the water absorption rate is reduced, so there is a risk that it is not suitable for use when cleansing the face. In contrast, in samples C to E in which the amount of moisturizer applied is 4.8% or more and 11% or less, compared with the opposite case (the case in which the amount of moisturizer-containing liquid applied is less than 4.8%, and the case in which the amount of moisturizer-containing liquid applied is more than 11%), they have sufficient strength and are easy to achieve good skin touch and water absorption (water retention), and are therefore suitable for use when cleansing.

[0103] In addition, Figure 4 In the test, the fuzziness 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 piece) is rubbed with a predetermined nylon brush, cloth abrasive, etc. to remove the fuzziness and pilling, and the fuzziness / pilling properties are visually evaluated under the specified lighting conditions. Figure 4In the sample F with a liquid application amount (%) of 15.1%, the fuzzing level is level 2, and in the samples A to E with a liquid application amount of less than 11%, the fuzzing level is level 3 to level 3.5. As described above, in the sample F with severe fuzzing on the surface, the strength, skin feel, and water absorption of the sheet member are likely to deteriorate. Therefore, it is preferred that in the facial cleansing sheet 1 of the present embodiment, the fuzzing level according to GB / T4802.1-2008 is level 3 or above. This can suppress excessive fuzzing on the sheet surface, and can realize a sheet member that is more suitable for use when cleansing the face with a smooth skin feel and not too low strength.

[0104] In addition, the nonwoven fabric as the base material of the facial cleansing sheet 1 is mainly composed of fibers, and the fibers are composed of hydrophilic natural fibers. Fibers composed of natural fibers are more likely to have a higher water absorption than fibers composed of petrochemical materials such as petroleum, so that a nonwoven fabric with good moisture retention and water absorption can be formed. In addition, it is easy to maintain the softness of the nonwoven fabric by utilizing the absorbed water, so it is suitable for use on sensitive skin and is suitable as a facial cleansing sheet.

[0105] The liquid applied to the facial cleansing sheet 1 contains, in addition to the moisturizing agent, hydrolyzed hyaluronic acid, Centella asiatica (see Figure 2 The hydrolyzed hyaluronic acid and Centella asiatica have the functions of moisturizing agent and anti-gasification agent, and play a skin beautifying effect such as inhibiting skin dryness and giving elasticity. Therefore, a cleansing sheet that can make the skin feel good when cleansing and perform skin care can be realized.

[0106] In addition, Figure 4 In the figure, the tensile strength of samples C to E is 40N / 50mm or more in both the MD direction (longitudinal direction) and the CD direction (transverse direction). In the past, sheet members such as non-woven fabrics used for facial cleansing were practical if they had a tensile strength of about 30N / 50mm. That is, in the facial cleansing sheet 1 (samples C to E) of this embodiment, softness and moisturizing properties are ensured by containing a liquid such as a moisturizer, and the sheet has sufficient strength (30N / 50mm or more) to at least withstand use as a facial cleanser. Therefore, a facial cleansing sheet that is not easily torn while maintaining moisturizing properties and softness can be realized.

[0107] In addition, the tensile strength (N / 50mm) of the sheet member can be measured as described below. First, cut out multiple (for example, 3) test pieces of about 50mm×about 200mm from each sample A to F. Next, clamp the cut test piece between the chucks of a tensile testing machine (for example, Series 2712 & 2732 manufactured by INSTRON), and adjust the distance between the chucks to 100mm without relaxing the test piece. Then, stretch the test piece at a tensile speed of 10cm / min to expand the distance between the chucks, and record the force (N) when the test piece is cut. Repeat this measurement for multiple (3) test pieces, and set the average value of the force (N) when the test piece is cut as the tensile strength (N / 50mm).

[0108] Figure 7A to Figure 7C This is a diagram for explaining the state when the face cleansing sheet 1 is stretched in the longitudinal direction (MD direction) and the transverse direction (CD direction). Fig. 7A It represents the surface on one side in the thickness direction and the surface on the other side in the thickness direction of the facial cleansing sheet 1 in the natural state before stretching. Figure 3 As described in , the base material (nonwoven fabric) of the facial cleansing sheet 1 is manufactured by overlapping and integrating a cross-woven sheet having a fiber orientation inclined relative to the longitudinal direction (MD direction) and a parallel-woven sheet having a fiber orientation parallel to the longitudinal direction (MD direction) in the thickness direction. Fig. 7A In the figure, the fiber orientation on one side in the thickness direction of the facial cleansing sheet 1 is tilted relative to the MD direction (cross-woven sheet), and the fiber orientation on the other side in the thickness direction is parallel to the MD direction (parallel woven sheet). Fig. 7A This is a diagram conceptually showing the fiber orientation for the purpose of explanation. In the actual facial cleansing sheet 1 (nonwoven fabric), the fibers are intricately interwoven with each other, so the fiber orientation on one side and the other side in the thickness direction is not the same as Fig. 8A That's obviously different.

[0109] Figure 7B Indicates that Fig. 7A The state of the facial cleansing sheet 1 when stretched in the longitudinal direction (MD direction). Here, "stretched in the MD direction" means the state when stretched to 1.1 to 1.4 times the original length of the sheet. For example, in the case of a sheet with a length of 200 mm in the first direction, it means the state when stretched in the first direction to about 220 mm to 280 mm. Figure 7BIn the embodiment, there is no significant difference in appearance between the surface on one side and the surface on 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. More than 50% of the parallel woven sheets constituting the base material (nonwoven fabric) of the facial cleansing sheet 1 have fiber orientation substantially parallel to the longitudinal direction (MD direction), and therefore the stretching in the longitudinal direction (MD direction) is stronger than that in the transverse direction (CD direction). In fact, if we refer to Figure 4 The tensile strength (N / 50mm) of the face cleansing sheet 1 is measured. In the case of any of the 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 face cleansing sheet 1 is stretched in the longitudinal direction (MD direction), it is stronger than when it is stretched in the transverse direction (CD direction) (see the following description). Figure 7C ) is not easy to stretch significantly in the stretching direction (MD direction). Therefore, the change in appearance before and after stretching is small between the surface on one side and the surface on the other side in the thickness direction.

[0110] Figure 7C Indicates that Fig. 7A The facial cleansing sheet 1 is stretched in the transverse direction (CD direction). Figure 7C In the embodiment of the present invention, there is a large difference in appearance between the surface on one side and the surface on the other side in the thickness direction. For the parallel woven sheets and the cross woven sheets constituting the substrate (nonwoven fabric) of the facial cleansing sheet 1, the tensile strength in the transverse direction (CD direction) is weaker than the tensile strength in the longitudinal direction (MD direction), so the facial cleansing sheet 1 as a whole is 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), a plurality of wrinkles along the transverse direction are formed on the surface of the nonwoven fabric. That is, the surface of the nonwoven fabric is deformed in the thickness direction. In addition, although a plurality of wrinkles along the transverse direction are also formed on the surface of the nonwoven fabric on one side in the thickness direction, the number and size of the wrinkles (concavities and convexities) are smaller than those on the other side in the thickness direction.

[0111] Fig. 8A and Figure 8B Yes Figure 7C An image obtained by photographing the face cleansing sheet 1 in a state of. Fig. 8A is with Figure 7C The corresponding photographic image of one side of Figure 8B is with Figure 7C The other side of the corresponding photo image. Fig. 8A and Figure 8BAs shown in the figure, when the facial cleansing sheet 1 is stretched in the transverse direction (CD direction), wrinkles (concavities and convexities) are formed in the transverse direction, but the number of concavities and convexities formed per unit area and the height of the concavities and convexities are different on one side and the other side in the thickness direction. This is because the tensile strength in the transverse direction (CD direction) is different on one side and the other side in the thickness direction.

[0112] Specifically, on one side in the thickness direction, the cross-woven sheet having fiber orientation in a direction inclined with respect to the longitudinal direction (MD direction) has a greater influence (see Fig. 7A ), so the resistance to the stretching in the transverse direction (CD direction) acts, thereby acting to suppress the shrinkage of the nonwoven fabric in the longitudinal direction (MD direction). Therefore, on the surface on one side in the thickness direction, the influence of the shrinkage in the longitudinal direction (MD direction) is not easy to act, and wrinkles (concavities and convexities) are not easy to form.

[0113] On the other hand, on the other side in the thickness direction, the parallel woven fabric having fiber orientation in the direction parallel to the longitudinal direction (MD direction) has a greater influence (see Fig. 7A ), so it is not easy to act on the resistance to stretching in the transverse direction (CD direction), and the nonwoven fabric is easily contracted in the longitudinal direction (MD direction) in accordance with the case where the nonwoven fabric is stretched in the transverse direction (CD direction). Therefore, the influence of contraction in the longitudinal direction (MD direction) is easy to act on the surface on the other side in the thickness direction, and the fabric is easy to deform in the thickness direction with the contraction in the longitudinal direction (MD direction) and wrinkles (concave and convex) are easy to form on the surface.

[0114] 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 than when no liquid is applied, and the nonwoven fabric is easily stretched in the transverse direction (CD direction), so that wrinkles are easily formed when shrinkage occurs in the longitudinal direction (MD direction).

[0115] Thus, in the facial cleansing sheet 1 of the present embodiment, the fiber orientation of the fibers constituting the nonwoven fabric as the substrate is different on one side and the other side in the thickness direction. If it is such a structure, the probability of fibers with different orientations crossing each other increases, and the interlaced parts of the fibers increase when manufacturing the nonwoven fabric, thereby facilitating the improvement of the strength of the nonwoven fabric as a whole. In addition, by making the fiber orientation different on one side and the other side in the thickness direction, it is easy to produce differences along the direction in which the nonwoven fabric is easy to bend. That is, compared with the situation that it is easy to bend only in a specific direction, the nonwoven fabric as a whole is easy to produce three-dimensional bending deformation. Therefore, when used for facial cleansing, the nonwoven fabric can be freely deformed according to the unevenness of the user's skin, thereby improving the skin touch.

[0116] Here, fiber orientation refers to the representative arrangement direction of fibers as described above, and the state in which "fiber orientation is different on one side and the other side in the thickness direction" can be determined as described below. First, the face cleansing sheet 1 is placed on a flat plate with one side of the surface to be measured facing up so that wrinkles are not formed on the surface of the face cleansing sheet 1. Next, using a microscope (e.g., a scanning electron microscope such as JCM-5100 manufactured by JEOL Ltd.), an enlarged image is taken from a vertical direction to the measurement surface and printed to depict the fibers on a transparent PET sheet. The enlarged image is an image that is 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 binarized using nexus New Qube (stand-alone version) image processing software manufactured by NEXUS Co., Ltd. Using Fiber Orientation Analysis 8.13 Single, which is a fiber orientation analysis program, the orientation angle and the orientation intensity, which is the intensity at the 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 with the largest orientation strength is defined as the representative arrangement direction of the fibers on the measurement target surface (fiber orientation direction).

[0117] In addition, it is assumed that when the smaller angle of the angle formed by the representative arrangement direction of the fibers on the surface on one side in the thickness direction and the representative arrangement direction of the fibers on the surface on the other side in the thickness direction is greater than 30 degrees, the fiber orientation is different. In addition, since the cross-woven fabric on the surface on one side in the thickness direction of the facial cleansing sheet 1 has a greater influence, there is a situation where the fiber orientation is deviated and difficult to determine as a certain direction. In such a case, the fiber orientation is measured at multiple locations on the surface on one side in the thickness direction, and the fiber orientation of the above multiple locations is compared with the fiber orientation of the surface on the other side in the thickness direction. By the way, since the parallel woven fabric on the surface on the other side in the thickness direction of the facial cleansing sheet 1 has a greater influence, the fiber orientation is not easy to have a large deviation compared with the surface on one side in the thickness direction.

[0118] In addition, in the facial cleansing sheet 1, the number of concavo-convexities per unit area and the height of the concavo-convexities formed on the surface of the nonwoven fabric when stretched in the longitudinal direction (MD direction) are different from the number of concavo-convexities per unit area and the height of the concavo-convexities formed on the surface of the nonwoven fabric when stretched in the transverse direction (CD direction). Specifically, when stretched in the transverse direction (CD direction), larger concavo-convexities (wrinkles) are easily formed on the surface of the nonwoven fabric on the other side in the thickness direction (see Figure 7B , Figure 7C). By stretching the nonwoven fabric to form such irregularities (wrinkles) on the surface, water droplets, sebum, etc. attached to the skin can be easily wiped off by using the irregularities, so that a sheet member more suitable for use when cleansing the face can be formed.

[0119] In addition, when the facial cleansing sheet 1 is stretched in any one of the longitudinal direction (MD direction) and the transverse direction (CD direction) (a direction orthogonal to the representative arrangement direction of the fibers constituting the nonwoven fabric, in the above example, the transverse direction), the number of concavities per unit area and the height of the concavities formed on the surface of the nonwoven fabric on one side in the thickness direction are different from the number of concavities per unit area and the height of the concavities formed on the surface of the nonwoven fabric on the other side in the thickness direction. Specifically, when stretched in the transverse direction (CD direction), it is easy to form concavities (wrinkles) larger than those on one side on the surface on the other side in the thickness direction (see Figure 7B , Figure 7C ). This makes it easy to distinguish the front and back sides of the cleansing sheet 1, so that the user can efficiently use both sides of the cleansing sheet 1 when cleansing the face. In addition, the use of the cleansing sheet 1 can be expanded: using the side with larger unevenness to wipe off moisture and sebum, and using the side with smaller unevenness to gently wipe the skin, etc.

[0120] In addition, for the unevenness formed when such a facial cleansing sheet 1 is stretched in the transverse direction (CD direction), the angle between the representative arrangement direction of the fibers and the longitudinal direction (MD direction) is smaller on the side where the number of unevenness per unit area and the height of the unevenness are larger than on the side where the number of unevenness per unit area and the height of the unevenness are smaller. That is, the unevenness (wrinkles) are easily formed larger on the side where the fibers are arranged along the longitudinal direction (MD direction) than on the side where the fibers are arranged obliquely relative to the longitudinal direction (MD direction). With such a structure, the usability of the facial cleansing sheet 1 can be further improved. For example, after the cleansing sheet 1 is taken out after cleansing and wiped for the first time, the sheet is stretched in a direction perpendicular to the fiber orientation direction to generate larger bumps (wrinkles) on one side of the surface, thereby making it possible to make the bumps (wrinkles) of the sheet gently contact the skin for the part that cannot absorb water when wiped in a smooth state without bumps (wrinkles), so that sufficient wiping and a gentle wiping feeling can be felt with one sheet. Therefore, the user can easily use the cleansing sheet 1 in a more diverse manner.

[0121] Furthermore, when the facial cleansing sheet 1 is stretched in the direction along the fiber orientation direction, almost no irregularities are formed, and the sheet is kept smooth (see FIG. Figure 7B). Thus, the facial cleansing sheet 1 can be used in a differentiated manner according to the case where the facial cleansing sheet 1 is to be used with a smooth surface (when wiping a part of the face with fewer undulations) and the case where the facial cleansing sheet 1 is to be used with a surface formed with irregularities (when wiping a part of the face with more undulations). For example, when the facial cleansing sheet 1 is taken out from a container or package containing the facial cleansing sheet 1, by aligning the stretching direction of the sheet with the fiber orientation direction, the sheet can be taken out and used while maintaining the smoothness of the surface and the size of the sheet close to the state before taking out. Conversely, by orthogonally intersecting the stretching direction of the sheet with the fiber orientation direction when taking out, irregularities can be actively generated during use.

[0122] ===Other Implementation Methods===

[0123] The embodiments of the present invention are described above, but the above embodiments are embodiments for making the present invention easy to understand and are not intended to limit the present invention. It is also self-evident that the present invention can be changed and improved without departing from its purpose, and its equivalents are included in the present invention.

Claims

1. A facial cleansing sheet having a longitudinal direction and a transverse direction orthogonal to each other and composed of a nonwoven fabric formed by interweaving a plurality of fibers, characterized in that: The nonwoven fabric is a single-layer structure and contains a moisturizer. The average value of the surface friction coefficient in each of the longitudinal direction and the lateral direction is 0.18 or less.

2. The facial cleansing sheet according to claim 1, wherein The weight per unit area is 73 gsm or more, and the stiffness in each of the longitudinal direction and the transverse direction is 2.5 cm or less.

3. The facial cleansing sheet according to claim 1 or 2, characterized in that: The fibers constituting the nonwoven fabric have fiber orientations that are different between one side and the other side in the thickness direction.

4. The 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. The facial cleansing sheet according to claim 1 or 2, characterized in that: The fibers constituting the nonwoven fabric are mainly composed of hydrophilic natural-origin materials.

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

7. The facial cleansing sheet according to claim 1 or 2, characterized in that: According to GB / T4802.1-2008, the grade is above 3.

8. The facial cleansing sheet according to claim 1 or 2, characterized in that: The nonwoven fabric contains at least one of hyaluronic acid and Centella asiatica.

9. The facial cleansing sheet according to claim 3, wherein The number of projections and depressions per unit area and the height of the projections and depressions formed on the surface of the facial cleansing sheet when stretched in the longitudinal direction are different from the number of projections and depressions per unit area and the height of the projections and depressions formed on the surface of the facial cleansing sheet when stretched in the transverse direction.

10. A facial cleansing sheet having a longitudinal direction and a transverse direction orthogonal to each other and composed of a nonwoven fabric formed by interweaving a plurality of fibers, characterized in that: The nonwoven fabric is a single-layer structure and contains a moisturizer. When stretching is performed along any one of the longitudinal direction and the transverse direction, The number of projections and depressions per unit area and the height of the projections and depressions formed on one side in the thickness direction of the facial cleansing sheet are different from the number of projections and depressions per unit area and the height of the projections and depressions formed on the other side in the thickness direction of the facial cleansing sheet.

11. The facial cleansing sheet according to claim 10, wherein The fiber orientation of the fibers constituting the nonwoven fabric is different on one side and the other side in the thickness direction, In the case of stretching along the transverse direction, The angle between the fiber orientation direction of the surface on which the number of the projections and depressions per unit area and the height of the projections and depressions are larger and the longitudinal direction is smaller than the angle between the fiber orientation direction of the surface on which the number of the projections and depressions per unit area and the height of the projections and depressions are smaller.

12. The facial cleansing sheet according to claim 10 or 11, characterized in that In the case of stretching in a direction along the fiber orientation direction of the fibers constituting the nonwoven fabric, The above-mentioned irregularities are not formed, but the smooth state is maintained.

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