Moisturizing facial tissue

Abstract

A moisturizing facial tissue, which is obtained by applying an emulsion agent to a base paper, wherein the amount of the emulsion agent applied to the base paper is 15 mass% or more and 40 mass% or less relative to 100 mass% of the base paper, the sum of the dynamic friction coefficient MIU in the MD direction and the dynamic friction coefficient MIU in the CD direction is 1.5 or more and 1.95 or less, and the transfer amount of the emulsion agent is 0.7 g / m 2 1.5 g / m 2 or more and 1.5 g / m

Description

Technical Field

[0001] This invention relates to a moisturizing facial tissue. Background Technology

[0002] In recent years, the demand for moisturizing facial tissues has been gradually increasing. Moisturizing facial tissues are used for blowing the nose and wiping the mouth, and are mainly used around the face. Moisturizing facial tissues are made by coating the base paper of the tissue with an emulsion (or moisturizer) with glycerin as the main ingredient, which makes the tissue soft, moist and smooth (for example, see Patent Documents 1-5).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 5969301

[0006] Patent Document 2: Japanese Patent No. 6841317

[0007] Patent Document 3: Japanese Patent No. 7003359

[0008] Patent Document 4: Japanese Patent No. 7035790

[0009] Patent Document 5: Japanese Patent No. 7066600 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] For moisturizing facial tissues, we aim for greater softness and smoothness.

[0012] The technical problem of the present invention is to provide a moisturizing facial paper with excellent softness and smoothness.

[0013] means for solving problems

[0014] The first aspect of the present invention is a moisturizing facial paper, which is formed by coating a base paper with an emulsion agent. In this moisturizing facial paper, the coating amount of the aforementioned emulsion agent is 15% by mass or more and 40% by mass or less relative to 100% by mass of the aforementioned base paper, the sum of the coefficient of kinetic friction MIU in the MD direction and the coefficient of kinetic friction MIU in the CD direction is 1.5 or more and 1.95 or less, and the transfer amount of the aforementioned emulsion agent is 0.7 g / m². 2 Above and 1.5g / m 2 the following.

[0015] The effects of the invention

[0016] According to one aspect of the present invention, a moisturizing facial tissue with excellent softness and smoothness can be provided. Detailed Implementation

[0017] The embodiments of the present invention will be described in detail below. The moisturizing facial paper in this embodiment is made by coating a base paper with an emulsion agent.

[0018] The base paper is paper of any material. The pulp composition of the base paper (hereinafter referred to as "paper") can be a known composition used in paper. For example, the pulp blending ratio can be set to 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

[0019] Furthermore, there is no particular limit to the basis weight of paper (also known as paper density), and it can be determined based on the number of layers of the face paper, for example, 5 g / m². 2 Above and 80g / m 2 The following is preferred: 7g / m 2 Above and 50g / m 2 The following is more preferably 10g / m 2 Above and 13g / m 2 Furthermore, the basis weight can be measured according to the Japanese Industrial Standard JIS P 8124.

[0020] Furthermore, the thickness of the paper (hereinafter referred to as paper thickness) is not particularly limited, for example, it is 50 μm or more and 500 μm or less for every two layers, preferably 60 μm or more and 330 μm or less, and more preferably 100 μm or more and 200 μm or less. Moreover, the paper thickness can be measured according to the provisions of Japanese Industrial Standard JIS P 8111 (1998).

[0021] An emulsion is a humectant (hereinafter sometimes referred to as a "liquid agent") that is coated onto base paper in a liquid state. The composition of the emulsion (hereinafter sometimes referred to as a humectant) is not particularly limited; for example, it can be a water-based humectant, but is preferably a humectant with polyols as its main component. Polyols are not particularly limited; examples include glycerin.

[0022] The content of polyols included as the main component in the emulsion is not particularly limited, but is, for example, 50% by mass or more, preferably 60% by mass or more, and more preferably 70% by mass or more.

[0023] From the viewpoint of improving the surface properties (e.g., smoothness) of moisturizing facial sheets, emulsions may contain flowing paraffin. Furthermore, 1,3-propanediol may be contained in any amount (e.g., 6.1% by mass or more and 12.6% by mass or less) as needed.

[0024] Emulsions may contain additional known additives. Examples of additives include: moisturizing ingredients such as sorbitol; hydrophilic polymeric gelling agents used to improve the moisture retention of moisturizing facial tissues; surfactants; softening enhancers; oily components other than liquid paraffin that improve smoothness; emulsifiers, preservatives, defoamers, etc., which are used to improve the stability and spreadability of the emulsion.

[0025] There are no particular limitations on the method of applying the emulsion to the base paper, and known coating methods such as dipping, spraying, flexographic coating, and gravure coating can be used. Furthermore, from the perspective of supplying the emulsion with a stable coating amount and being able to uniformly coat the liquid agent on the entire coated surface, printing methods such as gravure coating and flexographic coating are preferred.

[0026] The coating amount of the emulsion agent is 15% by mass or more and 40% by mass or less relative to 100% by mass of the base paper, preferably 18% by mass or more and 37% by mass or less, and more preferably 20% by mass or more and 35% by mass or less. By adjusting the coating amount of the emulsion agent to a range of 15% by mass or more and 40% by mass or less relative to 100% by mass of the base paper, the softness and smoothness of the moisturizing paper can be maintained.

[0027] Furthermore, the emulsion coating weight per unit area of ​​the base paper is 2.7 g / m². 2 Above and 5g / m 2 The preferred value is 2.8 g / m³. 2 Above and 4.5g / m 2 The preferred value is 2.9 g / m 2 Above and 4g / m 2 the following.

[0028] Moisturizing facial tissues can be used for industrial, household, or portable purposes, with those for household use being the preferred option.

[0029] There is no particular limit to the basis weight (paper density) of moisturizing facial tissues, for example, 10g / m³. 2 Above and 25g / m 2 The preferred value is 13g / m³. 2 Above and 20g / m 2 The following is more preferably 15g / m 2 Above and 17g / m 2 Below. Here, the basis weight is the basis weight of the moisturizing facial paper displayed under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0030] The basis weight (paper density) of the moisturizing facial tissue was adjusted to 10g / m³. 2 Above and 25g / m 2The following steps help maintain the softness and smoothness of the moisturizing facial tissue.

[0031] The tensile strength of the moisturizing facial paper in the MD direction of this embodiment is arbitrary. For example, it can be adjusted to 177cN / 25mm or more and 210cN / 25mm or less, preferably 178cN / 25mm or more and 205cN / 25mm or less, and more preferably 179cN / 25mm or more and 200cN / 25mm or less.

[0032] Here, the MD direction refers to the conveying direction (longitudinal direction) of the moisturizing facial paper during manufacturing. Furthermore, the tensile strength in the MD direction is the strength of the facial paper when stretched in the MD direction under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0033] Furthermore, in the moisturizing facial paper of this embodiment, the tensile strength in the CD direction is arbitrary. For example, the tensile strength in the CD direction can be adjusted to 45cN / 25mm or more and 70cN / 25mm or less, preferably 48cN / 25mm or more and 69cN / 25mm or less, and more preferably 50cN / 25mm or more and 68cN / 25mm or less.

[0034] Here, the CD direction is the direction orthogonal (transverse) to the conveying direction (MD direction) of the moisturizing sheet during manufacturing. Furthermore, the tensile strength in the CD direction is the strength of the sheet when stretched in the CD direction under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0035] There are no particular limitations on the softness of moisturizing facial tissues; for example, it can be adjusted to 0.7cN / 100mm. 2 Above and 1.3cN / 100mm 2 The preferred value is 0.75cN / 100mm. 2 Above and 1.2cN / 100mm 2 The preferred value is 0.8cN / 100mm. 2 Above and 1.1cN / 100mm 2 Below. Here, softness is measured according to the handle-O-meter method of Japanese Industrial Standard JIS L 1096E, and is one of the indicators of softness.

[0036] The softness of the moisturizing facial tissue was adjusted to 0.7cN / 100mm. 2 Above and 1.3cN / 100mm 2 The following steps can improve the softness of moisturizing facial tissues.

[0037] In the moisturizing facial paper of this embodiment, the sum of the coefficient of kinetic friction MIU in the MD direction and the coefficient of kinetic friction MIU in the CD direction (hereinafter referred to as the coefficient of kinetic friction MIU[MD direction + CD direction]) is adjusted to be 1.5 or more and 1.95 or less, preferably 1.6 or more and 1.93 or less, and more preferably 1.7 or more and 1.91 or less.

[0038] Here, the coefficient of kinetic friction (MIU) is the ratio of the kinetic friction force between the moisturizing sheet and the skin to the normal force acting on the friction surface of the skin when the moisturizing sheet comes into contact with the skin (by wiping the skin with the moisturizing sheet). In this embodiment, a lower MIU value indicates that the moisturizing sheet contacts the skin in a smoother manner.

[0039] In the moisturizing facial paper of this embodiment, the sum of MMD in the MD direction and MMD in the CD direction is 10 times (hereinafter referred to as MMD[(MD direction + CD direction) × 10]), preferably adjusted to 6.2 or more and 7.0 or less, more preferably 6.25 or more and 6.9 or less, and even more preferably 6.3 or more and 6.8 or less.

[0040] Here, MMD represents the average deviation of the coefficient of kinetic friction between the moisturizing facial tissue and human skin. In this embodiment, a lower MMD value indicates that the moisturizing facial tissue contacts the skin in a smoother manner.

[0041] The moisturizing facial paper of this embodiment preferably has a softness value (HF value) of 92 or higher as measured by a softness measuring device TSA, more preferably 92.5 or higher, and even more preferably 93 or higher. Furthermore, there is no particular upper limit to the HF value, but it is estimated to be at least 100.

[0042] Here, TSA stands for Tissue Softness Analyzer, manufactured by Emtec Electronics.

[0043] The softness measuring device TSA (hereinafter referred to as TSA) is a device for measuring the properties of flat and soft materials such as face paper, cloth, and leather.

[0044] Furthermore, the HF value is calculated using three parameters measured by the TSA, representing softness, smoothness, and stiffness. The HF value is calculated using Emtec Electronics' standard algorithm, Facial III. In this embodiment, a higher HF value indicates a greater perceived softness of the moisturizing facial paper.

[0045] The moisturizing facial paper preferably has a softness peak value (TS7) of 11 or less as measured by a softness measuring device (TSA), more preferably 10.9 or less, and even more preferably 10 or less. Furthermore, there is no particular limitation on the lower limit of the peak value (TS7), which is estimated to be at most 5 or more.

[0046] Here, the softness peak TS7 (hereinafter referred to as TS7) represents the softness parameter measured by TSA. In this embodiment, a lower TS7 value indicates a greater tendency for the moisturizing facial paper to feel soft. Furthermore, TS7 is used to calculate the aforementioned hand feel value HF (HF value).

[0047] The moisturizing facial paper preferably has a softness peak value (TS750) of 11 or less as measured by a softness measuring device (TSA), more preferably 10.5 or less, and even more preferably 10 or less. Furthermore, there is no particular limitation on the lower limit of the peak value (TS750), which is estimated to be at most 5 or more.

[0048] Here, the softness peak TS750 (hereinafter referred to as TS750) represents the softness parameter measured by TSA. In this embodiment, a lower TS750 value indicates a greater tendency for the moisturizing facial paper to feel smooth. Furthermore, TS750, along with TS7 mentioned above, is used to calculate the aforementioned hand feel value HF.

[0049] The moisturizing facial paper preferably has a D value of 3 mm / N or more as measured by a TSA softness measuring device, more preferably 3.1 mm / N or more, and even more preferably 3.2 mm / N or more.

[0050] Here, the D value (mm / N) represents the stiffness parameter measured by TSA. In this embodiment, a lower D value indicates a greater tendency for the moisturizing sheet to feel soft. Furthermore, the D value is used to calculate the aforementioned hand feel value HF (HF value).

[0051] In this embodiment, the preferred Spd value for the moisturizing facial paper is 15.5 (l / mm). 2 ) or less, more preferably 15.4 (l / mm) 2 ) or less, and more preferably 15.3 (l / mm) 2 Below that. Furthermore, there is no specific limit to the lower limit of Spd; it is estimated to be at most 13 (l / mm). 2 )above.

[0052] Here, Spd(l / mm) 2 Surface roughness (Spd) is an indicator that represents the smoothness of an object's surface according to the international standard ISO 25178, which defines the evaluation method for surface roughness. In this embodiment, a higher Spd value indicates a smoother surface for the moisturizing facial paper.

[0053] There are no particular restrictions on the Spc (spc) of moisturizing facial tissues. For example, it is preferable that the Spc is 4.8 (l / mm) or higher, preferably 4.85 (l / mm) or higher, and more preferably 4.9 (l / mm) or higher. Furthermore, there are no particular restrictions on the upper limit of the Spc, but it is estimated to be at least 6 or lower.

[0054] Here, Spc (l / mm) is an indicator that represents the smoothness of an object's surface according to the surface properties (surface roughness measurement) specified in ISO 25178. In this embodiment, a higher Spc value indicates greater resistance in the feel of the moisturizing facial paper.

[0055] The Sdr of the moisturizing facial paper in this embodiment is preferably 0.0215 or higher, more preferably 0.022 or higher, and even more preferably 0.0225 or higher. Furthermore, there is no particular upper limit to the Sdr, but it is estimated to be at least 0.03.

[0056] Here, Sdr is an indicator that represents the softness of an object's surface according to the surface properties (surface roughness measurement) specified in ISO 25178. In this embodiment, a higher Sdr value indicates a smoother surface of the moisturizing facial paper.

[0057] In this embodiment, the micrometer size (Sq) of the moisturizing facial tissue is preferably 12.5 μm or more, more preferably 12.6 μm or more, and even more preferably 12.7 μm or more. Furthermore, there is no particular upper limit to the Sq, but it is estimated to be at least 15 μm or less.

[0058] Here, Sq (μm) is an indicator that represents the surface roughness of an object according to the surface properties (surface roughness measurement) specified in ISO 25178. In this embodiment, a larger Sq value indicates a greater surface roughness of the moisturizing sheet.

[0059] In this embodiment of the moisturizing facial paper, the transfer amount of emulsion agent is adjusted to 0.7 g / m². 2 Above and 1.5g / m 2 The preferred setting is 0.8 g / m³. 2 Above and 1.3g / m 2 The following is a preferred adjustment to 0.9 g / m 2 Above and 1.1g / m 2 the following.

[0060] Here, transfer amount refers to the amount of emulsion transferred from each sheet of moisturizing tissue to the skin when the skin is wiped with the tissue (the amount of emulsion that is released from the moisturizing tissue and reduced).

[0061] As described above, the moisturizing facial paper in this embodiment is adjusted to have a dynamic friction coefficient MIU [MD direction + CD direction] of 1.5 or higher and 1.95 or lower, and the transfer amount of emulsion agent contained in the moisturizing facial paper is 0.7 g / m². 2 Above and 1.5g / m 2 Therefore, when you wipe your skin with a moisturizing sheet, the lotion will be transferred from the sheet to your skin.

[0062] The emulsion transferred to the skin forms a barrier (skin barrier) on the skin, thereby inhibiting the amount of moisture evaporating from the skin (moisture evaporation). As a result, when the skin is wiped with a moisturizing sheet, it is less likely to damage the skin and can moisturize it. Therefore, according to this embodiment, a moisturizing sheet can be provided that is softer and smoother than conventional sheets and is more skin-friendly.

[0063] As described above, in the moisturizing facial paper of this embodiment, by adjusting the tensile strength in the MD direction to 177cN / 25mm or more and 210cN / 25mm or less, the transfer amount of emulsion in the moisturizing facial paper can be precisely adjusted to 0.7g / m². 2 Above and 1.5g / m 2 The following range. Therefore, in this embodiment, the amount of moisture evaporation when wiping the skin with a moisturizing facial tissue can be reliably suppressed.

[0064] As described above, in the moisturizing facial paper of this embodiment, by adjusting the tensile strength in the CD direction to 45cN / 25mm or more and 70cN / 25mm or less, the transfer amount of emulsion in the moisturizing facial paper can be precisely adjusted to 0.7g / m². 2 Above and 1.5g / m 2 The following range. Therefore, according to this embodiment, when the skin is wiped with a moisturizing facial tissue, the lotion can be transferred more effectively from the moisturizing facial tissue to the skin.

[0065] As described above, in this embodiment of the moisturizing facial paper, by adjusting MMD [(MD direction + CD direction) × 10] to 6.2 or higher and 7.0 or lower, the coefficient of kinetic friction MIU [MD direction + CD direction] in the moisturizing facial paper can be adjusted with high precision to a range of 1.5 or higher and 1.95 or lower. Therefore, according to this embodiment, when the skin is wiped with the moisturizing facial paper, the emulsion can be transferred more effectively from the moisturizing facial paper to the skin.

[0066] As described above, in this embodiment of the moisturizing facial paper, by adjusting Sdr to 0.0215 or higher, it is less likely to damage the skin when wiping it, and it can moisturize the skin while further improving the smoothness of the moisturizing facial paper.

[0067] As described above, in this embodiment of the moisturizing facial paper, Spd is adjusted to 15.5 (l / mm). 2 In this way, the surface of the moisturizing sheet does not become too slippery, making it easier for the emulsion applied to the sheet to transfer to the skin. Therefore, according to this embodiment, a skin barrier can be effectively formed by the emulsion transferred to the skin.

[0068] As described above, in the moisturizing facial paper of this embodiment, by adjusting Sq to 12.5 μm or more, a suitable unevenness can be given to the surface of the moisturizing facial paper, thus making it easier for the emulsion applied to the moisturizing facial paper to transfer to the skin. Therefore, according to this embodiment, a skin barrier generated by the emulsion transferred to the skin can be effectively formed.

[0069] As described above, in this embodiment of the moisturizing facial paper, by adjusting the HF value measured by TSA to 92 or higher, it is less likely to damage the skin when wiping it, and can moisturize the skin while further improving the softness of the moisturizing facial paper.

[0070] Example

[0071] The present invention will now be further described in detail using specific examples. The evaluation of the examples and comparative examples was conducted through the following tests.

[0072] [Examples 1-2, Comparative Examples 1-5]

[0073] Moisturizing face paper was prepared by coating a base paper with an emulsion containing glycerin as the main component in a manner that determined the amount of liquid agent to be applied, and this was used as a sample. The conditions of the samples of Examples 1-2 and Comparative Examples 1-5 are shown in Table 1.

[0074] [Liquid drug adhesion amount]

[0075] Extraction was performed using a Soxhlet extractor with a mixed solvent of acetone and ethanol (acetone:ethanol = 1:1 by volume) under reflux for 4 hours. The liquid agent adhesion percentage was calculated based on the following formula. Alternatively, the liquid agent adhesion percentage (g / m²) can also be calculated by converting the base paper to a per-unit area. 2 The calculation is performed using N=2.

[0076] Adhesion amount (g / m 2 = (Basis weight - Adhesion amount) × Liquid agent adhesion amount / 100

[0077] [Basis weight (paper density)]

[0078] The basis weight (paper density) of the sample was determined according to Japanese Industrial Standard JIS P 8124. The unit of basis weight is g / m³.2 The basis weight was determined under constant temperature and humidity conditions (temperature 23℃, humidity 50%).

[0079] Tensile strength

[0080] Tensile strength was measured according to Japanese Industrial Standard JIS P 8113 (1998). Samples were cut to approximately 25 mm (±0.5 mm) wide and 150 mm long in both the MD (longitudinal) and CD (transverse) directions. A Minebea TG-200N load cell tensile testing machine was used. The tensile strength was measured as follows: the clamp spacing was set to 100 mm, the two ends of the test piece were fixed to the clamps of the testing machine, and a tensile load was applied to the paper in the up-down direction. The reading at the point of paper breakage was then recorded (digital value). The tensile speed was set to 100 mm / min in the MD direction and 50 mm / min in the CD direction. Five sets of samples were prepared, and five measurements were taken in each direction (longitudinal and transverse). The average of the measured values ​​was taken as the tensile strength (cN / 25 mm) in each direction. The tensile strength was measured under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0081] [softness]

[0082] The stiffness-flexibility test was conducted according to the Japanese Industrial Standard JIS L1096E. The sample size was set to 100mm × 100mm, and the clearance was set to 5mm. Five measurements were performed in each of the longitudinal and transverse directions for a single layer. The average of these ten measurements was then expressed as cN / 100mm. 2 The softness is expressed in units. The softness test was conducted under constant temperature and humidity conditions (temperature 23℃, humidity 50%).

[0083] [Dynamic friction coefficient MIU]

[0084] The average coefficient of friction (dynamic friction coefficient MIU) was measured using a friction sensor (manufactured by Gato Technology Co., Ltd., KES-SE) as the measuring terminal moved linearly across the sample. The dynamic friction coefficient MIU was measured under constant temperature and humidity conditions (temperature 23°C, humidity 50%). In this embodiment, the sum of the dynamic friction coefficient MIU in the MD direction and the dynamic friction coefficient MIU in the CD direction was calculated (labeled in Table 1 as dynamic friction coefficient MIU[MD direction + CD direction]).

[0085] [MMD]

[0086] Using a friction sensor (manufactured by Gato Technology Co., Ltd., KES-SE), the mean deviation (MMD) of the coefficient of friction was measured as the measuring terminal moved linearly across the sample. The MMD was measured under constant temperature and humidity conditions (temperature 23°C, humidity 50%). In this embodiment, 10 times the sum of the MMD in the MD direction and the MMD in the CD direction was calculated (denoted as MMD[(MD direction + CD direction) × 10] in Table 1).

[0087] [TSA Measurement]

[0088] The tissue softness analyzer (TSA) manufactured by Emtec Electronics was used to measure the HF value (HF value), peak softness TS7, peak softness TS750, and D value (mm / N). The TSA measurements were performed under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0089] [Spd]

[0090] Three-dimensional image data was measured using a One Shot 3D shape measuring machine (Kines, VR6000), and then image analysis was performed using an analysis application (Kines, VR-6000 Application) to calculate Spd (1 / mm). 2 The measurements were corrected using a fluctuation correction of 20, then the valley folds of the moisturizing sheet were used, and the average value was calculated using N=5.

[0091] [Spc]

[0092] Three-dimensional image data was measured using a One Shot 3D shape measuring machine (Kines, VR6000), and then image analysis was performed using an analysis application (Kines, VR-6000 Application) to determine Spc (1 / mm). Measurements were corrected using a fluctuation correction of 20, and then the valley folds of the moisturizing paper were used, with an average value of N=5.

[0093] [Sdr]

[0094] Three-dimensional image data was measured using a One Shot 3D shape measuring machine (Kines, VR6000), and then image analysis was performed using an analysis application (Kines, VR-6000 Application) to determine the Sdr. Measurements were corrected using a fluctuation correction of 20, and then the valley folds of the moisturizing sheet were used, with an average value of N=5.

[0095] [Sq]

[0096] Three-dimensional image data was measured using a One Shot 3D shape measuring machine (Kines, VR6000), and then image analysis was performed using an analysis application (Kines, VR-6000 Application) to determine Sq (μm). Measurements were corrected using a fluctuation correction of 20, and then the valley folds of the moisturizing sheet were used, with an average value of N=5.

[0097] [Liquid drug transfer volume]

[0098] The amount of liquid medication transferred to the skin when wiped with a tissue (transfer amount) was determined. Two containers with a bottom diameter of 80mm x 80mm were prepared. The sample was folded in half and then clamped (installed) between the two containers. The mass was measured and recorded as the transfer amount of the emulsion. The determination was performed with N=10.

[0099] [Water evapotranspiration]

[0100] The amount of moisture evaporated from the skin was measured using a portable moisture evaporator (Delfin Technologies, VapoMeter SWL5001). The sample was wiped 20 times in a single direction at the measurement site. Each time, a fresh side of the sample was used. The moisture evaporation (g / m³) at the same location was then measured again. 2 h). The pre-experiment measurement result is considered as 1, and the difference (%) before and after the experiment is compared. The experiment is conducted with N=10. When the water evaporation is 0.95 g / m³... 2 A value below 0.95 g / m³ is considered good; a value exceeding 0.95 g / m³ is considered good. 2 The evaluation was poor at time h.

[0101] [Sensory Test]

[0102] The evaluation criteria include softness, moisture, smoothness, thickness, and resistance to breakage, as well as a comprehensive evaluation of these factors. A comprehensive evaluation score of 5.5 or higher is considered good, while a score below 5.5 is considered poor.

[0103] The experimental results are shown in Table 1.

[0104] [Table 1]

[0105]

[0106] Based on Table 1, the following adjusted samples (moisturizing facial paper) showed good moisture evaporation in sensory evaluation (overall evaluation) (Examples 1 and 2). These were adjusted as follows: tensile strength in the MD direction was ≥177 cN / 25 mm and ≤210 cN / 25 mm; tensile strength in the CD direction was ≥45 cN / 25 mm and ≤70 cN / 25 mm; coefficient of dynamic friction MIU [MD direction + CD direction] was ≥1.5 and ≤1.95; MMD [(MD direction + CD direction) × 10] was ≥6.2 and ≤7.0; TSA HF value was ≥92; and Spd was 15.5 (1 / mm²). 2 For printing with a minimum Sdr value of 0.0215 and a maximum Sq value of 12.5 μm, the liquid reagent transfer amount is 0.7 g / m². 2 Above and 1.5g / m 2 the following.

[0107] In contrast, samples whose tensile strength in the MD direction, tensile strength in the CD direction, coefficient of dynamic friction MIU [MD direction + CD direction], MMD [(MD direction + CD direction) × 10], HF value of TSA, Spd, Sdr, Sq, and liquid agent transfer amount were outside the range of Examples 1 and 2, and were unsatisfactory in terms of moisture evaporation and sensory evaluation (overall evaluation) (Comparative Examples 1 to 5).

[0108] Based on these results, it is believed that the coefficient of kinetic friction (MIU) [MD direction + CD direction] of the moisturizing facial paper is above 1.5 and below 1.95, and the transfer amount of emulsion contained in the moisturizing facial paper is 0.7 g / m². 2 Above and 1.5g / m 2 The following moisturizing facial tissues are gentle on the skin and provide hydration when wiped, exhibiting excellent softness and smoothness.

[0109] The above describes the embodiments of the present invention. However, the present invention is not limited to specific embodiments. Various changes and modifications can be made within the scope of the invention as described in the claims.

[0110] The preferred embodiments of the present invention are described below.

[0111] The first aspect of the present invention is a moisturizing facial paper, which is formed by coating a base paper with an emulsion agent. In this moisturizing facial paper, the coating amount of the aforementioned emulsion agent is 15% by mass or more and 40% by mass or less relative to 100% by mass of the aforementioned base paper, the sum of the coefficient of kinetic friction MIU in the MD direction and the coefficient of kinetic friction MIU in the CD direction is 1.5 or more and 1.95 or less, and the transfer amount of the aforementioned emulsion agent is 0.7 g / m². 2 Above and 1.5g / m 2 the following.

[0112] In this manual, the coefficient of kinetic friction (MIU) is the ratio of the kinetic friction force between two contacting objects to the normal force acting on the friction surface; a lower value indicates a smoother surface. Transfer amount refers to the amount of emulsion transferred from each sheet of moisturizing facial tissue to the skin when wiping the skin with the tissue (the amount of emulsion released from the facial tissue and reduced in quantity).

[0113] The first method was adjusted to: the sum of the kinetic friction coefficients MIU in the MD direction and CD direction of the moisturizing facial paper (denoted as friction coefficient MIU[MD direction + CD direction]) is 1.5 or higher and 1.95 or lower, and the transfer amount of emulsion agent contained in the moisturizing facial paper is 0.7 g / m 2 Above and 1.5g / m 2 Therefore, when you wipe your skin with a moisturizing sheet, the lotion will be transferred from the sheet to your skin.

[0114] The emulsion transferred to the skin forms a barrier on the skin (hereinafter referred to as the "skin barrier"), which can inhibit the amount of moisture evaporating from the skin (hereinafter referred to as "moisture evaporation"). As a result, when wiping the skin with a moisturizing sheet, it is less likely to damage the skin and can moisturize the skin. Therefore, according to the first method, a moisturizing sheet can be provided that is softer and smoother than the previous one and is more skin-friendly.

[0115] The second aspect of the present invention is a moisturizing facial paper as described in the first aspect above, wherein the tensile strength in the MD direction is 177cN / 25mm or more and 210cN / 25mm or less.

[0116] In this specification, the MD direction refers to the conveying direction (longitudinal direction) of the moisturizing facial paper during manufacturing. The tensile strength in the MD direction refers to the strength of the facial paper when stretched in the MD direction under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0117] In the second method, by adjusting the tensile strength in the MD direction to above 177cN / 25mm and below 210cN / 25mm, the transfer amount of emulsion agent in the moisturizing facial paper can be precisely adjusted to the above range (0.7g / m²). 2 Above and 1.5g / m 2 (See below). Therefore, according to the second method, it is possible to reliably suppress the amount of moisture evaporation when wiping the skin with a moisturizing facial tissue.

[0118] The third aspect of this invention is a moisturizing facial paper as described in the first or second aspect above, wherein the tensile strength in the CD direction is 45cN / 25mm or more and 70cN / 25mm or less.

[0119] In this specification, the CD direction refers to the direction (transverse direction) orthogonal to the conveying direction (MD direction) of the moisturizing sheet during manufacturing. The tensile strength in the CD direction refers to the strength of the sheet when stretched in the CD direction under constant temperature and humidity conditions (temperature 23°C, humidity 50%).

[0120] In the third method, by adjusting the tensile strength in the CD direction to above 45cN / 25mm and below 70cN / 25mm, the transfer amount of emulsion agent in the moisturizing facial paper can be precisely adjusted to the above range (0.7g / m²). 2 Above and 1.5g / m 2 (See below). Therefore, according to the third method, the lotion can be efficiently transferred from the moisturizing sheet to the skin when the skin is wiped with a moisturizing sheet.

[0121] The fourth method in this invention is a moisturizing facial tissue as described in any of the first to third methods mentioned above, wherein 10 times the sum of MMD in the MD direction and MMD in the CD direction is 6.2 or more and 7.0 or less.

[0122] In this manual, MMD is the average deviation of the coefficient of kinetic friction; the lower the value, the smoother the friction.

[0123] In the fourth method, by adjusting the sum of the MMD in the MD direction and the MMD in the CD direction of the moisturizing sheet to 10 times (hereinafter, indicated as MMD[(MD direction + CD direction) × 10]) to 6.2 or higher and 7.0 or lower, the coefficient of kinetic friction MIU[MD direction + CD direction] in the moisturizing sheet can be adjusted to the above range (1.5 or higher and 1.95 or lower) with high precision. Therefore, according to the fourth method, when wiping the skin with a moisturizing sheet, the emulsion can be efficiently transferred from the moisturizing sheet to the skin.

[0124] The fifth method in this invention is a moisturizing facial tissue as described in any of the first to fourth methods mentioned above, wherein Sdr is 0.0215 or higher.

[0125] In this manual, Sdr is an indicator that represents the smoothness of the surface of an object according to the international standard, namely ISO 25178, which specifies the method for evaluating surface roughness. The higher the value, the smoother the surface of the moisturizing sheet.

[0126] In the fifth method, by adjusting Sdr to above 0.0215, the skin is less likely to be damaged when wiping it, and the skin is moisturized while the smoothness of the moisturizing sheet is further improved.

[0127] The sixth method in this invention is a moisturizing facial sheet as described in any of the first to fifth methods mentioned above, wherein Spd is 15.5 (l / mm). 2 )the following.

[0128] In this specification, Spd(l / mm) 2 Surface roughness is an indicator that represents the smoothness of an object's surface according to the international standard, ISO 25178, which specifies the evaluation method for surface roughness. The higher the value, the smoother the surface of the moisturizing sheet.

[0129] In the sixth method, Spd is adjusted to 15.5 (l / mm). 2 In this way, the surface of the moisturizing sheet will not become too slippery, making it easier for the emulsion applied to the sheet to transfer to the skin. Therefore, according to the sixth method, a skin barrier can be effectively formed by the emulsion transferred to the skin.

[0130] The seventh method in this invention is a moisturizing facial tissue as described in any of the first to sixth methods mentioned above, wherein Sq is 12.5 μm or more.

[0131] In this specification, Sq(μm) is an indicator that represents the surface roughness of an object according to the international standard, namely ISO 25178. ISO 25178 establishes a method for evaluating surface roughness. The larger the value, the greater the surface roughness of the moisturizing paper.

[0132] In the seventh method, by adjusting the Sq to 12.5μm or higher, a suitable texture can be imparted to the surface of the moisturizing sheet, thus making it easier for the emulsion applied to the moisturizing sheet to transfer to the skin. Therefore, according to the sixth method, a skin barrier can be effectively formed by the emulsion transferred to the skin.

[0133] The eighth method in this invention is a moisturizing facial paper as described in any of the first to seventh methods, wherein the hand feel value HF measured by the softness measuring device TSA is 92 or higher.

[0134] In this instruction manual, the softness measuring device TSA (hereinafter referred to as TSA) refers to a device for measuring the properties of flat and soft materials such as facial tissues, fabrics, and leather. Furthermore, the hand feel value HF (hereinafter referred to as "HF value" or "HF value of TSA") is a value calculated from three parameters representing softness, smoothness, and stiffness measured by the TSA. A higher HF value indicates a greater tendency for the moisturizing facial tissue to feel pleasant to the touch.

[0135] In the eighth method, by adjusting the HF value measured by the TSA to above 92, the skin is less likely to be damaged when wiping it, and the skin is moisturized while the softness of the moisturizing sheet is further improved.

[0136] This application claims priority based on Japanese Patent Application No. 2022-091229, filed on June 3, 2022, the entire contents of which are incorporated herein by reference.

Claims

1. A moisturizing facial paper, which is made by coating a base paper with an emulsion agent, wherein the moisturizing facial paper contains... The coating amount of the emulsion agent is 15% by mass or more and 40% by mass or less relative to 100% by mass of the base paper. The sum of the kinetic friction coefficients MIU in the MD direction and CD direction is greater than 1.5 and less than 1.95, and The transfer amount of the emulsion is 0.7 g / m². 2 Above and 1.5g / m 2 the following, The tensile strength in the MD direction is above 177cN / 25mm and below 210cN / 25mm. The moisture evaporation rate of the moisturizing facial paper is 0.95 g / m³. 2 Below h.

2. The moisturizing facial paper as described in claim 1, wherein, The tensile strength in the CD direction is above 45cN / 25mm and below 70cN / 25mm.

3. The moisturizing facial paper as described in claim 1, wherein, The sum of MMD in the MD direction and MMD in the CD direction is 10 times the value of 6.2 or higher and 7.0 or lower.

4. The moisturizing facial paper as described in claim 1, wherein, Sdr is above 0.0215.

5. The moisturizing facial paper as described in claim 1, wherein, Spd is 15.5 (l / mm) 2 )the following.

6. The moisturizing facial paper as described in claim 1, wherein, Sq is above 12.5μm.

7. The moisturizing facial tissue according to any one of claims 1 to 6, wherein, The hand feel value (HF) measured by the TSA softness measuring device is above 92.

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