Moisturizing facial tissue

Abstract

A moisture-retaining surface paper obtained by applying an emulsion to a base paper, the amount of the emulsion applied in the moisture-retaining surface paper being from 15% by mass to 40% by mass (inclusive) with respect to 100% by mass of the base paper, the sum of the coefficient of dynamic friction MIU in the MD direction and the coefficient of dynamic friction MIU in the CD direction being from 1.5 to 1.95 (inclusive), and the sum of the coefficient of dynamic friction MIU in the MD direction and the coefficient of dynamic friction MIU in the CD direction being from 1.5 to 1.95 (inclusive). The transfer amount of the emulsion agent is 0.7 g / m < 2 > or more and 1.5 g / m < 2 > or less.

Description

Technical Field

[0001] The invention relates to a moisturizing facial tissue. Background Art

[0002] In recent years, the demand for moisturizing facial tissue has gradually increased. Moisturizing facial tissue is used for blowing nose and wiping mouth, etc., and is mainly used around the face. Moisturizing facial tissue is made soft and moist and the surface is smooth by applying an emulsion (or moisturizer) with glycerin as the main component to the base paper of the facial tissue (for example, refer to Patent Documents 1 to 5).

[0003] Prior art literature

[0004] Patent Literature

[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] Problems to be solved by the invention

[0011] For moisturizing facial tissue, we seek higher softness and smoothness.

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

[0013] Means used to solve problems

[0014] A first aspect of the present invention is a moisturizing facial paper, which is formed by applying an emulsion to a base paper, wherein the amount of the emulsion applied 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 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 is 0.7 g / m 2 Above and 1.5g / m 2 the following.

[0015] Effects of the Invention

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

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

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

[0019] In addition, the basis weight of the paper (also called paper density) is not particularly limited and can be determined based on the number of layers of the surface paper, for example, 5 g / m 2 Above and 80g / m 2 Below, preferably 7g / m 2 Above and 50g / m 2 Below, more preferably 10g / m 2 Above and 13g / m 2 The basis weight can be measured in accordance with the provisions of Japanese Industrial Standards JIS P 8124.

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

[0021] An emulsion is a moisturizing agent (hereinafter sometimes referred to as a "liquid agent") that is applied to base paper in a liquid state. The ingredients of the emulsion (hereinafter sometimes referred to as a moisturizing agent) are not particularly limited, and are, for example, aqueous moisturizing agents, preferably moisturizing agents containing polyols as a main component. The polyols are not particularly limited, and examples thereof include glycerin.

[0022] The content of the polyol contained as a main component in the emulsion is not particularly limited, and 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 (eg, smoothness) of the moisturizing facial tissue, the emulsion may contain liquid paraffin. In addition, any amount (eg, 6.1% by mass or more and 12.6% by mass or less) of 1,3-propylene glycol may be contained as required.

[0024] The emulsion may contain known auxiliary agents. Examples of auxiliary agents include: moisturizing auxiliary components such as sorbitol; hydrophilic polymer gelling agents, which are used to improve the water retention in the moisturizing tissue; surfactants; softness enhancers; oily components other than liquid paraffin, which assist in the performance of smoothness; emulsifiers, preservatives, defoaming agents, etc., which are used to improve the stability and coating properties of the emulsion.

[0025] The method of applying the emulsion to the base paper is not particularly limited, and known coating methods such as dipping, spraying, flexographic coating, and gravure coating can be used. In addition, from the point of view of supplying the emulsion at a stable coating amount and being able to uniformly apply the liquid agent to the entire coating surface, a printing method such as gravure coating and flexographic coating is preferably used.

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

[0027] The amount of emulsion applied per unit area of ​​the base paper was 2.7 g / m 2 Above and 5g / m 2 Below, preferably 2.8g / m 2 Above and 4.5g / m 2 Below, more preferably 2.9g / m 2 Above 4g / m 2 the following.

[0028] The moisturizing facial tissue can be used for industrial, household, or portable purposes, and among these, moisturizing facial tissue used for household purposes is preferred.

[0029] The basis weight (paper density) of the moisturizing facial tissue is not particularly limited, and is, for example, 10 g / m 2 Above and 25g / m 2 Below, preferably 13g / m 2 Above and 20g / m 2 Below, more preferably 15g / m 2 Above and 17g / m 2 Here, the basis weight is the basis weight of the moisturizing facial tissue in a constant temperature and humidity environment (temperature 23°C, humidity 50%).

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

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

[0032] Here, the MD direction is the conveying direction (longitudinal direction) of the moisturizing facial tissue during manufacture. In addition, the tensile strength in the MD direction is the strength of the facial tissue when it is stretched in the MD direction under a constant temperature and humidity environment (temperature 23° C., humidity 50%).

[0033] In addition, 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 be greater than 45cN / 25mm and less than 70cN / 25mm, preferably greater than 48cN / 25mm and less than 69cN / 25mm, and more preferably greater than 50cN / 25mm and less than 68cN / 25mm.

[0034] Here, the CD direction is the direction (transverse direction) perpendicular to the conveying direction (MD direction) of the moisturizing facial tissue during manufacturing. In addition, the tensile strength in the CD direction is the strength of the facial tissue when it is stretched in the CD direction under a constant temperature and humidity environment (temperature 23°C, humidity 50%).

[0035] The softness of the moisturizing tissue is not particularly limited, and can be adjusted to 0.7 cN / 100 mm, for example. 2 Above and 1.3cN / 100mm 2 Below, preferably 0.75 cN / 100 mm 2 Above and 1.2cN / 100mm 2 Below, more preferably 0.8 cN / 100 mm 2 Above and 1.1cN / 100mm 2 Here, the softness is measured by the handle-O-meter method according to the Japanese Industrial Standard JIS L 1096E method, and is one of the indicators showing the softness.

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

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

[0038] Here, the dynamic friction coefficient MIU is the ratio of the dynamic friction force between the moisturizing facial paper and the skin when the moisturizing facial paper contacts the human skin (wiping the human skin with the moisturizing facial paper) to the normal force acting on the friction surface of the skin. In this embodiment, the lower the value of the dynamic friction coefficient MIU, the smoother the moisturizing facial paper contacts the skin.

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

[0040] Here, MMD is the average deviation of the dynamic friction coefficient between the moisturizing facial paper and human skin. In this embodiment, the lower the value of MMD, the more the moisturizing facial paper contacts the skin in a smoother manner.

[0041] The moisturizing facial tissue of this embodiment preferably has a hand feel value HF (hereinafter referred to as HF value) measured by a softness measuring device TSA of 92 or more, more preferably 92.5 or more, and even more preferably 93 or more. The upper limit of the HF value is not particularly limited, but is estimated to be at least 100.

[0042] Here, the softness analyzer TSA refers to a tissue softness analyzer (TSA: Tissue Softness Analyzer) manufactured by Emtec Electronic.

[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 tissue paper, cloth, and leather.

[0044] In addition, the HF value is calculated from three parameters indicating softness, smoothness, and rigidity measured by TSA. The standard algorithm of Emtec Electronic, namely Facial III, is used for calculating the HF value. In this embodiment, the higher the HF value, the more the moisturizing facial paper tends to be soft.

[0045] The moisturizing facial tissue preferably has a softness peak value TS7 measured by a softness measuring device TSA of 11 or less, more preferably 10.9 or less, and even more preferably 10 or less. The lower limit of the peak value TS7 is not particularly limited, and is estimated to be 5 or more at most.

[0046] Here, the softness peak value TS7 (hereinafter referred to as TS7) represents the parameter of softness measured by TSA. In this embodiment, the lower the TS7 value, the softer the moisturizing tissue paper is. Furthermore, TS7 is used to calculate the above-mentioned hand feel value HF (HF value).

[0047] The moisturizing facial tissue 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. The lower limit of the peak value TS750 is not particularly limited, and is estimated to be 5 or more at most.

[0048] Here, the softness peak value TS750 (hereinafter referred to as TS750) represents the parameter of softness measured by TSA. In this embodiment, the lower the TS750 value, the more the moisturizing facial tissue tends to be smooth. Furthermore, TS750 is used together with the above-mentioned TS7 to calculate the above-mentioned hand feel value HF.

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

[0050] Here, the D value (mm / N) represents a parameter of rigidity measured by TSA. In this embodiment, the lower the D value, the softer the moisturizing facial tissue is. Furthermore, the D value is used to calculate the above-mentioned hand feel value HF (HF value).

[0051] The preferred Spd of the moisturizing facial paper of this embodiment is 15.5 (l / mm 2 ) or less, more preferably 15.4 (l / mm 2 ) or less, more preferably 15.3 (l / mm 2 ) or less. Furthermore, there is no particular limit on the lower limit of Spd, but it is estimated to be up to 13 (l / mm 2 )above.

[0052] Here, Spd(l / mm 2 ) is an index that indicates the smoothness of the surface of an object according to the surface properties (surface roughness measurement) specified in the international standard ISO 25178, which defines a method for evaluating surface roughness. In this embodiment, a higher Spd value indicates that the surface of the moisturizing facial tissue is smoother.

[0053] The Spc in the moisturizing facial tissue is not particularly limited, for example, the Spc is 4.8 (l / mm) or more, preferably 4.85 (l / mm) or more, and more preferably 4.9 (l / mm) or more. Furthermore, the upper limit of Spc is not particularly limited, and it is estimated to be at least 6 or less.

[0054] Here, Spc (l / mm) is an index indicating the smoothness of the surface of an object according to the surface properties (surface roughness measurement) specified in ISO 25178. In the present embodiment, a higher value of Spc indicates a greater resistance to the touch of the moisturizing facial tissue.

[0055] The Sdr of the moisturizing facial paper of the present embodiment is preferably 0.0215 or more, more preferably 0.022 or more, and even more preferably 0.0225 or more. The upper limit of Sdr is not particularly limited, but is estimated to be at least 0.03.

[0056] Here, Sdr is an index indicating the softness of the surface of an object according to the surface properties (surface roughness measurement) specified in ISO 25178. In the present embodiment, a higher value of Sdr indicates that the surface of the moisturizing facial tissue is smoother.

[0057] The Sq of the moisturizing facial paper of the present embodiment is preferably 12.5 μm or more, more preferably 12.6 μm or more, and even more preferably 12.7 μm or more. The upper limit of Sq is not particularly limited, but is estimated to be at least 15 μm or less.

[0058] Here, Sq (μm) is an index indicating the surface roughness of an object according to the surface properties (surface roughness measurement) specified in ISO 25178. In the present embodiment, a larger value of Sq indicates that the surface roughness of the moisturizing facial paper is larger.

[0059] In the moisturizing facial tissue of this embodiment, the transfer amount of the emulsion is adjusted to 0.7 g / m 2 Above and 1.5g / m 2 Below, preferably adjusted to 0.8g / m 2 Above and 1.3g / m 2 Below, more preferably adjusted to 0.9g / m 2 Above and 1.1g / m 2 the following.

[0060] Here, the transfer amount means the amount of the lotion per base paper transferred from the moisturizing facial paper to the skin when the skin is wiped with the moisturizing facial paper (the amount of the lotion released and reduced from the moisturizing facial paper).

[0061] As described above, the moisturizing facial paper of this embodiment is adjusted so that the dynamic friction coefficient MIU [MD direction + CD direction] is 1.5 or more and 1.95 or less, and the transfer amount of the emulsion contained in the moisturizing facial paper is 0.7 g / m 2 Above and 1.5g / m 2 As a result, when the skin is wiped with the moisturizing facial tissue, the lotion is transferred from the moisturizing facial tissue to the skin.

[0062] The emulsion transferred to the skin forms a barrier on the skin (skin barrier), and can suppress the amount of water evaporating from the skin (water evaporation). As a result, when the skin is wiped with the moisturizing facial tissue, it is not easy to damage the skin and can moisturize the skin. Therefore, according to this embodiment, it is possible to provide a moisturizing facial tissue that is more soft and smooth than the conventional one and is skin-friendly.

[0063] As described above, in the moisturizing facial paper of this embodiment, by adjusting the tensile strength in the MD direction to 177 cN / 25 mm or more and 210 cN / 25 mm or less, the transfer amount of the emulsion in the moisturizing facial paper can be adjusted to 0.7 g / m with high accuracy. 2 Above and 1.5g / m 2 Therefore, in this embodiment, the amount of water evaporation when the skin is wiped with the moisturizing 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 45 cN / 25 mm or more and 70 cN / 25 mm or less, the transfer amount of the emulsion in the moisturizing facial paper can be adjusted to 0.7 g / m with high accuracy. 2 Above and 1.5g / m 2 Therefore, according to this embodiment, when the skin is wiped with the moisturizing facial paper, the lotion can be more effectively transferred from the moisturizing facial paper to the skin.

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

[0066] As described above, in the moisturizing facial paper of the present embodiment, by adjusting the Sdr to 0.0215 or more, the skin is less likely to be damaged when wiping the skin, and the smoothness of the moisturizing facial paper can be further improved while moisturizing the skin.

[0067] As described above, in the moisturizing facial tissue of this embodiment, by adjusting Spd to 15.5 (l / mm 2 ) or less, the surface of the moisturizing facial paper will not become too smooth, so the lotion applied to the moisturizing facial paper will become easily transferred to the skin. Therefore, according to this embodiment, a skin barrier generated by the lotion transferred to the skin can be effectively formed.

[0068] As described above, in the moisturizing facial paper of this embodiment, by adjusting the Sq to 12.5 μm or more, the surface of the moisturizing facial paper can be given appropriate unevenness, so that the lotion applied to the moisturizing facial paper can be easily transferred to the skin. Therefore, according to this embodiment, a skin barrier generated by the lotion transferred to the skin can be effectively formed.

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

[0070] Example

[0071] Hereinafter, the present invention will be described in more detail using examples. Evaluations of the examples and comparative examples were performed by the following tests.

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

[0073] The conditions of the samples of Examples 1 to 2 and Comparative Examples 1 to 5 are shown in Table 1.

[0074] [Liquid medicine adhesion amount]

[0075] The mixture was extracted by Soxhlet extraction with a mixed solvent of acetone and ethanol (acetone:ethanol = 1:1 by volume ratio) for 4 hours under reflux. The amount of liquid agent attached (%) was calculated based on the following formula. In addition, the amount of liquid agent attached per unit area of ​​the base paper (g / m 2 The measurement was performed with N=2.

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

[0077] [Basic weight (paper density)]

[0078] The basis weight (paper density) of the sample is measured according to the Japanese Industrial Standard JIS P 8124. The unit of basis weight is g / m2 The basis weight was measured under a constant temperature and humidity environment (temperature 23° C., humidity 50%).

[0079] [Tensile strength]

[0080] The tensile strength is measured in accordance with the provisions of Japanese Industrial Standards JIS P 8113 (1998). The samples are cut into samples with a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the MD direction (longitudinal direction) and the CD direction (transverse direction). The test machine is a load cell tensile tester TG-200N manufactured by Minebea. The tensile strength is measured according to the following steps: the clamp interval is set to 100 mm, the two ends of the test piece are fixed to the clamps of the test machine, and a tensile load is applied to the paper piece in the up and down directions, and then the indication value (digital value) is read when the paper breaks. The tensile speed is set to 100 mm / min in the MD direction and 50 mm / min in the CD direction. Prepare 5 groups of samples each, measure 5 times each in the longitudinal direction and the transverse direction, and then set the average of the measured values ​​as the tensile strength (cN / 25mm) in each direction. The tensile strength is measured under a constant temperature and humidity environment (temperature 23°C, humidity 50%).

[0081] [Softness]

[0082] The measurement was carried out according to the rigid-flexibility measurement method, which was based on the Japanese Industrial Standard JIS L1096E method. The sample was set to a size of 100mm×100mm and the clearance was set to 5mm. The single layer was measured 5 times in the longitudinal direction and 5 times in the transverse direction, and the average value of the total 10 times was calculated as cN / 100mm. 2 The softness is measured in a constant temperature and humidity environment (temperature 23°C, humidity 50%).

[0083] [Coefficient of dynamic friction MIU]

[0084] The average friction coefficient (dynamic friction coefficient MIU) when the measuring terminal moves linearly on the sample is measured using a friction sensor (manufactured by KES-SE, Inc.). The dynamic friction coefficient MIU is measured under a constant temperature and humidity environment (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 is calculated (indicated as dynamic friction coefficient MIU [MD direction + CD direction] in Table 1).

[0085] [MMD]

[0086] A friction sensor (manufactured by KES-SE, Inc.) was used to measure the mean deviation (MMD) of the friction coefficient when the measuring terminal was moved linearly on the sample. The MMD was measured under a constant temperature and humidity environment (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 hand feeling value HF (HF value), softness peak TS7, softness peak TS750, and D value (mm / N) were measured using a tissue softness analyzer (TSA) manufactured by Emtec Electronic Co. The TSA measurement was performed under a constant temperature and humidity environment (temperature 23°C, humidity 50%).

[0089] [Spd]

[0090] The three-dimensional image data was measured by One Shot 3D shape measuring machine (manufactured by Keynes, VR6000), and then the image was analyzed by an analysis application (manufactured by Keynes, VR-6000 Application) to obtain Spd (1 / mm 2 ). The measurement was corrected using a fluctuation correction of 20, then the valley fold of the moisturizing facial tissue was used, and the average value of N=5 was used.

[0091] [Spc]

[0092] The three-dimensional image data was measured by One Shot 3D shape measuring machine (manufactured by Keynes, VR6000), and then image analysis was performed by analysis application (manufactured by Keynes, VR-6000 Application) to obtain Spc (1 / mm). The measurement was corrected using fluctuation correction 20, and the valley fold of moisturizing facial tissue was used, and the average value of N=5 was used.

[0093] [Sdr]

[0094] The three-dimensional image data was measured by One Shot 3D shape measuring machine (manufactured by Keynes, VR6000), and then image analysis was performed by analysis application (manufactured by Keynes, VR-6000 Application) to obtain Sdr. The measurement was corrected using fluctuation correction 20, and the valley fold of moisturizing facial tissue was used, and the average value of N=5 was used.

[0095] [Sq]

[0096] The three-dimensional image data was measured by One Shot 3D shape measuring machine (manufactured by Keynes, VR6000), and then image analysis was performed by analysis application (manufactured by Keynes, VR-6000 Application) to obtain Sq (μm). The measurement was corrected using fluctuation correction 20, and the valley fold of moisturizing facial tissue was used, and the average value of N=5 was used.

[0097] [Liquid medicine transfer amount]

[0098] Measure how much liquid medicine is transferred to the skin when wiped with tissue paper (transfer amount). Prepare two containers with a bottom surface of 80mm×80mm, fold the sample in half and clamp (install) it between the two containers, measure the mass, and set it as the transfer amount of the emulsion. The measurement is carried out with N=10.

[0099] [Water evapotranspiration]

[0100] The water evaporation of the skin was measured using a portable evaporimeter (VapoMeter SWL5001 manufactured by Delfin Technologies). The sample was rubbed 20 times in a single direction at the location to be measured. A new side of the sample was used. Afterwards, the water evaporation (g / m 2 h). Consider the result before the test as 1 and compare the difference (%) before and after the test. The test was carried out with N=10. When the water evaporation is 0.95g / m 2 h or less was evaluated as good, and when it exceeded 0.95 g / m 2 h was evaluated as poor.

[0101] [Sensory test]

[0102] Evaluations of softness, moistness, smoothness, thickness, and crack resistance and their comprehensive evaluation were performed. A comprehensive evaluation of 5.5 or more was considered good, and a comprehensive evaluation of less than 5.5 was considered poor.

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

[0104] [Table 1]

[0105]

[0106] Based on Table 1, the moisture evaporation of the samples (moisturizing facial tissue) adjusted as follows is good in sensory evaluation (comprehensive evaluation) (Examples 1 and 2), which are adjusted to: the tensile strength in the MD direction is 177 cN / 25 mm or more and 210 cN / 25 mm or less, the tensile strength in the CD direction is 45 cN / 25 mm or more and 70 cN / 25 mm or less, the dynamic friction coefficient MIU [MD direction + CD direction] is 1.5 or more and 1.95 or less, MMD [(MD direction + CD direction) × 10] is 6.2 or more and 7.0 or less, the HF value of TSA is 92 or more, and the Spd is 15.5 (1 / mm 2 ) or less, Sdr is 0.0215 or more, Sq is 12.5μm or more, and the liquid agent transfer amount is 0.7g / m 2 Above and 1.5g / m 2 the following.

[0107] In contrast, samples in which at least any one of the tensile strength in the MD direction, the tensile strength in the CD direction, the dynamic friction coefficient MIU [MD direction + CD direction], MMD [(MD direction + CD direction) × 10], the HF value of TSA, Spd, Sdr, Sq, and the amount of liquid drug transferred is outside the range of Examples 1 and 2 are poor in terms of water evaporation and sensory evaluation (comprehensive evaluation) (Comparison Examples 1 to 5).

[0108] From these results, it is believed that the coefficient of dynamic friction MIU (MD direction + CD direction) of the moisturizing facial paper is adjusted to be 1.5 or more and 1.95 or less, and the amount of the emulsion contained in the moisturizing facial paper is adjusted to be 0.7 g / m 2 Above and 1.5g / m 2 The following moisturizing facial tissues are not likely to cause damage to the skin when wiped with the moisturizing facial tissues, and can provide moisture to the skin, and can be said to have excellent softness and smoothness.

[0109] As mentioned above, although embodiment of this invention was described, this invention is not limited to a specific embodiment, Various changes and modifications are possible within the scope of the invention described in the claims.

[0110] Preferred embodiments of the present invention will be described below.

[0111] A first aspect of the present invention is a moisturizing facial paper, which is formed by applying an emulsion to a base paper, wherein the amount of the emulsion applied 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 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 is 0.7 g / m 2 Above and 1.5g / m 2 the following.

[0112] In this specification, the coefficient of dynamic friction MIU is the ratio of the dynamic friction between two objects in contact to the normal force acting on the friction surface. The lower the value, the smoother it is. The transfer amount means: when wiping the skin with moisturizing facial tissue, the amount of lotion per base paper transferred from the moisturizing facial tissue to the skin (the amount of lotion released from the moisturizing facial tissue and reduced).

[0113] In the first embodiment, the sum of the dynamic friction coefficient MIU in the MD direction and the dynamic friction coefficient MIU in the CD direction (denoted as friction coefficient MIU [MD direction + CD direction]) of the moisturizing facial paper is adjusted to be 1.5 or more and 1.95 or less, and the transfer amount of the emulsion contained in the moisturizing facial paper is 0.7 g / m 2 Above and 1.5g / m 2 As a result, when the skin is wiped with the moisturizing facial tissue, the lotion is transferred from the moisturizing facial tissue to the skin.

[0114] The emulsion transferred to the skin forms a barrier on the skin (hereinafter referred to as "skin barrier"), and can suppress the amount of water evaporating from the skin (hereinafter referred to as "water evaporation"). As a result, when the skin is wiped with the moisturizing facial tissue, it is not easy to damage the skin and can moisturize the skin. Therefore, according to the first embodiment, it is possible to provide a moisturizing facial tissue that is more soft and smooth than the conventional one and is skin-friendly.

[0115] A second aspect of the present invention is the moisturizing facial tissue according to the first aspect, wherein the tensile strength in the MD direction is 177 cN / 25 mm or more and 210 cN / 25 mm or less.

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

[0117] In the second embodiment, by adjusting the tensile strength in the MD direction to 177 cN / 25 mm or more and 210 cN / 25 mm or less, the transfer amount of the emulsion in the moisturizing facial paper can be adjusted to the above range (0.7 g / m 2 Above and 1.5g / m 2 Therefore, according to the second aspect, the amount of water evaporation when the skin is wiped with the moisturizing tissue can be reliably suppressed.

[0118] A third aspect of the present invention is the moisturizing facial tissue according to the first aspect or the second aspect, wherein the tensile strength in the CD direction is 45 cN / 25 mm or more and 70 cN / 25 mm or less.

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

[0120] In the third embodiment, by adjusting the tensile strength in the CD direction to 45 cN / 25 mm or more and 70 cN / 25 mm or less, the transfer amount of the emulsion in the moisturizing facial paper can be adjusted to the above range (0.7 g / m 2 Above and 1.5g / m 2 Therefore, according to the third aspect, when the skin is wiped with the moisturizing facial paper, the emulsion can be efficiently transferred from the moisturizing facial paper to the skin.

[0121] A fourth aspect of the present invention is the moisturizing facial paper according to any one of the first to third aspects, wherein 10 times the sum of the MMD in the MD direction and the MMD in the CD direction is 6.2 or more and 7.0 or less.

[0122] In this specification, MMD is the mean deviation of the dynamic friction coefficient, and the lower the value, the smoother the vehicle.

[0123] In the fourth embodiment, by adjusting 10 times the sum of the MMD in the MD direction and the MMD in the CD direction of the moisturizing facial paper (hereinafter, indicated as MMD [(MD direction + CD direction) × 10]) to 6.2 or more and 7.0 or less, the dynamic friction coefficient MIU [MD direction + CD direction] in the moisturizing facial paper can be adjusted to the above range (1.5 or more and 1.95 or less) with high accuracy. Therefore, according to the fourth embodiment, when the moisturizing facial paper is used to wipe the skin, the lotion can be efficiently transferred from the moisturizing facial paper to the skin.

[0124] A fifth aspect of the present invention is the moisturizing facial tissue according to any one of the first to fourth aspects, wherein Sdr is 0.0215 or more.

[0125] In this specification, Sdr is an index that indicates the softness of an object's surface according to the surface properties (surface roughness measurement) specified in the international standard ISO25178. ISO25178 has established a method for evaluating surface roughness. The higher the value, the smoother the surface of the moisturizing facial tissue.

[0126] In the fifth aspect, by adjusting the Sdr to 0.0215 or more, the skin is less likely to be damaged when wiping the skin, and the smoothness of the moisturizing facial tissue can be further improved while moisturizing the skin.

[0127] The sixth aspect of the present invention is a moisturizing facial tissue according to any one of the first to fifth aspects, wherein Spd is 15.5 (l / mm 2 )the following.

[0128] In this specification, Spd (l / mm 2 ) is an indicator that indicates the smoothness of an object's surface based on the surface properties (surface roughness measurement) specified in the international standard ISO25178. ISO25178 has established a method for evaluating surface roughness. The higher the value, the smoother the surface of the moisturizing facial tissue.

[0129] In the sixth method, by adjusting Spd to 15.5 (l / mm 2 ) or less, the surface of the moisturizing facial paper will not become too smooth, so the emulsion applied to the moisturizing facial paper will become easily transferred to the skin. Therefore, according to the sixth aspect, a skin barrier generated by the emulsion transferred to the skin can be effectively formed.

[0130] A seventh aspect of the present invention is the moisturizing facial paper according to any one of the first to sixth aspects, 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 based on the surface properties (surface roughness measurement) specified in the international standard ISO25178. ISO25178 has established a method for evaluating surface roughness. The larger the value, the greater the surface roughness of the moisturizing facial tissue.

[0132] In the seventh aspect, by adjusting Sq to 12.5 μm or more, the surface of the moisturizing facial paper can be given appropriate irregularities, so that the lotion applied to the moisturizing facial paper can be easily transferred to the skin. Therefore, according to the sixth aspect, a skin barrier can be effectively formed by the lotion transferred to the skin.

[0133] An eighth aspect of the present invention is the moisturizing facial tissue according to any one of the first to seventh aspects, wherein the hand feel value HF measured by a softness measuring device TSA is 92 or more.

[0134] In this specification, 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 tissue paper, cloth, leather, etc. In addition, the hand feeling value HF (hereinafter referred to as "HF value" or "HF value of TSA") refers to a value calculated from three parameters indicating softness, smoothness, and rigidity measured by TSA. The higher the HF value, the more it can be felt that the moisturizing tissue tends to have a good hand feeling.

[0135] In the eighth aspect, by adjusting the HF value measured by TSA to 92 or more, the skin is less likely to be damaged when wiping the skin, and the softness of the moisturizing facial tissue can be further improved while moisturizing the skin.

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

Claims

1. A moisturizing facial paper, which is formed by coating a base paper with an emulsion, wherein: The coating amount of the emulsion 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 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 is 0.7 g / m 2 Above and 1.5g / m 2 the following.

2. The moisturizing facial tissue according to claim 1, wherein: The tensile strength in the MD direction is 177 cN / 25 mm or more and 210 cN / 25 mm or less.

3. The moisturizing facial tissue according to claim 1, wherein: The tensile strength in the CD direction is 45 cN / 25 mm or more and 70 cN / 25 mm or less.

4. The moisturizing facial tissue according to claim 1, wherein: 10 times the sum of the MMD in the MD direction and the MMD in the CD direction is 6.2 or more and 7.0 or less.

5. The moisturizing facial tissue according to claim 1, wherein: Sdr is 0.0215 or more.

6. The moisturizing facial tissue according to claim 1, wherein: Spd is 15.5(l / mm 2 )the following.

7. The moisturizing facial tissue according to claim 1, wherein: Sq is 12.5 μm or more.

8. The moisturizing facial tissue according to any one of claims 1 to 7, wherein The hand feeling value HF measured by the softness measuring device TSA is 92 or more.

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