Liquid-impregnated sheet

Abstract

To provide a liquid-impregnated sheet that can improve color matching with skin. [Solution] The liquid-impregnated sheet 1 is equipped with a color-blurring surface 6. When the color-blurring surface 6 is measured using a colorimeter capable of measuring Munsell values, with a circular area of ​​8 mm in diameter as the measurement range, and 15 measurement points spaced at least 15 mm apart from each other at their center points, the following conditions 1 and 2 are met. Condition 1: The proportion of measurement points with B-type hues (hue range 0.1B to 10B), PB-type hue (hue range 0.1PB to 7.4PB), or BG-type hue (hue range 0.1BG to 10.0BG) relative to the total number of measurement points must be 80% or more. Condition 2: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

Description

[Technical Field]

[0001] This invention relates to a liquid-impregnated sheet. [Background technology]

[0002] On hot days, in direct sunlight, or during sports, cooling the neck area is a common practice to prevent heatstroke and alleviate the feeling of heat. One way to cool your neck is to place or wrap a towel soaked in water around your neck.

[0003] On the other hand, sheets made by impregnating nonwoven fabric with liquid have also been proposed. For example, the present applicant previously proposed a liquid-impregnated sheet that includes a base sheet containing a fibrous material and a liquid impregnated into the base sheet, and is used by being worn around the neck (Patent Document 1). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Utility Model Registration No. 3249645 Gazette [Overview of the project] [Problems that the invention aims to solve]

[0005] However, when we considered making the liquid-impregnated sheets colored from a design perspective, we found that some colors did not blend well with skin tones. For example, the liquid-impregnated sheets were conspicuous, which prevented us from creating a unified impression. Therefore, the first object of the present invention relates to a liquid-impregnated sheet that can improve color matching with skin.

[0006] Furthermore, when we considered making the liquid-impregnated sheets colored from a design perspective, we found that some colors did not blend well with the skin tone, giving the impression, for example, that the face and body were separated and the face stood out more. Therefore, the second object of the present invention relates to a liquid-impregnated sheet that does not give the impression that the face and body are separated in appearance. [Means for solving the problem]

[0007] In order to solve the first problem described above, the inventors conducted diligent research and found that by using a blue-based color that satisfies specific conditions, the color of the liquid-impregnated sheet can be made to blend well with the wearer's skin, thereby mitigating the inconvenience of the liquid-impregnated sheet being conspicuous and causing discomfort. The present invention (first invention) is based on the above findings and relates to a liquid-impregnated sheet having a base sheet containing a fibrous material, which is impregnated with a liquid and used by being wrapped around the neck. In one embodiment, it is preferable that the base sheet has a longitudinal direction and a transverse direction and is provided with a color-blurring surface. In one embodiment, it is preferable that the color-blurred surface satisfies the following conditions 1 and 2 when Munsell values ​​are measured at 15 measurement points, with a circular area of ​​8 mm in diameter and a distance of 15 mm or more between their center points, using a colorimeter capable of measuring Munsell values. Condition 1: The proportion of measurement points with B-type hues (hue range 0.1B to 10B), PB-type hue (hue range 0.1PB to 7.4PB), or BG-type hue (hue range 0.1BG to 10.0BG) relative to the total number of measurement points must be 80% or more. Condition 2: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

[0008] In order to solve the second problem mentioned above, the inventors diligently conducted research and found that by using a color whose saturation in the Munsell color system satisfies certain conditions, the color can blend in with the wearer's skin, and the undesirable impression that the face and body are separated and the face stands out can be mitigated. The present invention (the second invention) has been made based on the above findings, and relates to a liquid-impregnated sheet that comprises a base sheet containing a fiber material and is used by being wrapped around a neck in a liquid-impregnated state. In one embodiment, it is preferable that the base sheet has a longitudinal direction and a transverse direction, and is provided with a color-blurred surface. In one embodiment, it is preferable that the color-blurred surface satisfies the following Condition 3 when Munsell values are measured at 15 measurement points, which are spaced apart from each other by 15 mm or more between center points, with a circular region having a diameter of 8 mm as a measurement range using a colorimeter capable of measuring Munsell values. Condition 3: the average value of chroma at all measurement points is 1.0 or more, and the standard deviation is 0.40 or more Effects of the Invention

[0009] According to the liquid-impregnated sheet of the present invention (the first invention), color compatibility with the skin can be improved. According to the liquid-impregnated sheet of the present invention (the second invention), it is possible to reduce the disadvantage of giving an impression that the face and the body are visually separated. Brief Description of Drawings

[0010] [Figure 1] FIG. 1 is a developed plan view showing one embodiment of the liquid-impregnated sheet of the present invention. [Figure 2] FIGS. 2(a) and 2(b) are views showing a state where the liquid-impregnated sheet of FIG. 1 is worn around the neck, where (a) is a schematic front view and (b) is a schematic cross-sectional view. [Figure 3] FIG. 3 is a perspective view showing an example of another connection method of the liquid-impregnated sheet of FIG. 1. [Figure 4] FIG. 4 is a schematic diagram of a Munsell color wheel. [Figure 5] FIG. 5 is an enlarged view of an essential part of a color-blurred surface [Figure 6] FIG. 6 is an explanatory view of a method for measuring Munsell values of a color-blurred surface. Mode for Carrying Out the Invention

[0011] The present invention (first and second inventions) will be described below with reference to the drawings, based on preferred embodiments thereof. Figure 1 shows one embodiment of the liquid-impregnated sheet of the present invention. The liquid-impregnated sheet 1 shown in Figure 1 has a longitudinal direction X and a transverse direction Y. More specifically, it has a rectangular shape, with the direction along the longer side of the rectangle being the longitudinal direction X, and the direction perpendicular to the longitudinal direction X being the transverse direction Y. The ratio L1 / L2 of the liquid-impregnated sheet 1 to the total length L1 in the longitudinal direction X relative to the total length L2 in the transverse direction Y is preferably 1 or more, more preferably 1.2 or more, from the viewpoint of improving ease of wrapping around the neck, and preferably 50 or less, more preferably 30 or less, and also preferably 1 to 50, more preferably 1.2 to 30, from the viewpoint of improving portability.

[0012] When the liquid-impregnated sheet 1 is for children (elementary school age or younger), the ratio L1 / L2 of the total length L1 in the longitudinal direction X to the total length L2 in the short direction Y is preferably 1.0 or more, more preferably 1.2 or more, from the viewpoint of improving ease of wrapping around the neck, and preferably 20 or less, more preferably 18 or less, and also preferably 1 to 20, more preferably 1.2 to 18, from the viewpoint of improving portability.

[0013] When the liquid-impregnated sheet 1 is for adults (junior high school students and older), the ratio L1 / L2 is preferably 1.5 or more, more preferably 1.7 or more, from the viewpoint of improving ease of wrapping around the neck, and preferably 50 or less, more preferably 30 or less, and also preferably 1.5 to 50, more preferably 1.7 to 30, from the viewpoint of improving portability.

[0014] The liquid-impregnated sheet 1 has a central region A and side regions B and C located on either side of the central region A, in the longitudinal direction X. The liquid-impregnated sheet 1 can be worn wrapped around the neck, and the side regions B and C can be connected to each other with the central region A positioned around the neck. Figure 2 shows the state in which the central region A is placed on the back of the neck, and then one side region B and the other side region C are connected on the front of the neck. As shown in Figure 2, the central region A is a region intended to be positioned in contact with the neck, and the side regions B and C are regions intended to maintain the annular shape of the liquid-impregnated sheet 1 when positioned around the neck by connecting them to each other. The method for connecting the side regions B and C can be, for example, by providing a first fastening member on one of the side regions B or C and a second fastening member on the other, and joining the first and second fastening members to each other by engagement, fitting, adhesion, bonding, crimping, or a combination of two or more of these methods. The first and second fastening members may be buttons and buttonholes, or male and female members of a mechanical hook-and-loop fastener. Figure 2 shows an example in which the male member 7 of the mechanical hook-and-loop fastener and the fastening area to which the male member 7 can engage are provided on different sides of the liquid-impregnated sheet 1, and the side region C is joined to the side region B in an overlapping state.

[0015] Furthermore, as a method for connecting the side regions B and C, for example, one side region B, which has an opening 5 formed in the liquid-impregnated sheet 1 from the beginning, is placed on the left side of the neck as seen from the user, and the other side region B, which does not have an opening 5, is placed on the right side of the neck as seen from the user [Figure 3(a)]. Then, a part of the other side region C is inserted into the opening 5, and the portion 8 protruding from the opening 5 is pulled from the opposite side until it fits appropriately around the neck [Figure 3(b)]. In this case, the liquid-impregnated sheet 1 is stably maintained in a state where it is attached around the neck due to friction and other interactions between the opening 5 and the portion inserted into the opening 5. Instead of having an opening 5 in the liquid-impregnated sheet 1 from the beginning, an opening 5 may be formed by providing a perforation 2 in one side region B and breaking the perforation 2.

[0016] The liquid-impregnated sheet 1 comprises a base sheet containing a fibrous material and a liquid impregnated into the base sheet. Examples of the base sheet containing the fibrous material include nonwoven fabrics, woven fabrics, or laminates thereof. Among these, nonwoven fabrics or woven fabrics are preferred. Nonwoven fabrics can be single-layer or multi-layer nonwoven fabrics. Nonwoven fabrics produced by various manufacturing methods are not particularly limited in their use. Examples of single-layer nonwoven fabrics include spunlace nonwoven fabrics, spunbond nonwoven fabrics, air-through nonwoven fabrics, and airlaid nonwoven fabrics. Examples of multi-layer nonwoven fabrics include spunbond-meltblown composite nonwoven fabrics (SM, SMS), composite nonwoven fabrics of air-through nonwoven fabric and spunbond nonwoven fabric, and composite nonwoven fabrics having a three-layer structure of spunlace / spunbond / spunlace. Examples of constituent fibers for nonwoven fabrics include cellulose fibers such as pulp, lyocell, rayon, acetate, and cotton; polyolefins such as polyethylene and polypropylene; polyester; and polyamide. These can also be blended. From the viewpoint of liquid retention, it is preferable that the nonwoven fabric has a layer consisting entirely or partially of cellulose fibers in the thickness direction. The mass percentage of cellulose fibers in the total mass of the nonwoven fabric is preferably 10% or more, more preferably 20% or more, and the upper limit is 100%. From the viewpoint of ease of wrapping around the neck, the basis weight of the nonwoven fabric is 30 g / m². 2 Preferably, it is 35 g / m² or more. 2 That concludes the explanation. Furthermore, the nonwoven fabric has a basis weight of 160 g / m², chosen for its fit around the neck. 2 Preferably, it is less than 130 g / m², and more preferably 130 g / m². 2 The following applies:

[0017] In this invention, the base sheet is colored. When the base sheet is a single layer, typically the single layer is colored. When the base sheet is a laminated sheet of two or more layers, one or more sheets constituting the laminated sheet are colored so that when the wearer of the liquid-impregnated sheet is viewed from the front, the color of the colored sheet is visible directly or indirectly through other sheets. The coloring of the sheets constituting the base sheet may be achieved by including a colorant in the fiber material, or by dyeing with dyes, printing, etc. Coloring as used herein does not mean chromatic or achromatic.

[0018] In this invention, the color of the base sheet is evaluated using the Munsell color system. The Munsell color system is a color system that represents color in stages of three attributes: hue, lightness, and saturation. In the Munsell color system, hue is represented by a combination of 10 main hues (R (red), Y (yellow), G (green), B (blue), P (purple)) arranged clockwise on the Munsell color wheel (see Figure 4)) and numerical values ​​(0.1 to 10, etc.). These hues are combined with the five basic hues R (red-yellow), Y (yellow-green), GY (yellow-green), BG (blue-green), PB (blue-purple), and RP (red-purple) placed between them. In this specification, in the clockwise direction of the Munsell color wheel, 0.1B is used next to 10BG, and 0.1PB is next to 10B. When showing average values, numbers with two decimal places are also used. In the Munsell color system, lightness indicates that the color becomes brighter as its value increases, and darker as its value decreases. Saturation indicates that the color becomes more vivid as its value increases, and duller as its value decreases.

[0019] In the present invention, at least one side of the base sheet is a color-blurring surface 6 (Figures 2(a) and 5). In the first invention, the color-blurred surface is a surface that appears to have uneven coloring and satisfies the following conditions 1 and 2. Condition 1: The proportion of measurement points with B-type hues (hue range 0.1B to 10B), PB-type hue (hue range 0.1PB to 7.4PB), or BG-type hue (hue range 0.1BG to 10.0BG) relative to the total number of measurement points must be 80% or more. Condition 2: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

[0020] In the second invention, the color-blurred surface is a surface that appears to have uneven coloring and satisfies the following condition 3. Condition 3: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

[0021] In this specification, when referring to a hue range of "greater than or equal to numerical value A and less than or equal to numerical value B," the upper and lower limits, numerical values ​​A and B, are included. For example, "greater than or equal to 0.1B and less than or equal to 10B" means the range from 0.1B to 10B when viewing the Munsell color circle clockwise, and includes the values ​​at both ends, 0.1B and 10B. Preferably, the base sheet has a color-blurred surface on at least one side, and it is preferable that the color-blurred surface covers 50% or more, preferably 90% or more, and more preferably 100% of the total area of ​​that side. Preferably, both sides of the base sheet have color-blurred surfaces, and it is preferable that the color-blurred surface covers 50% or more, preferably 90% or more, and more preferably 100% of the area of ​​each of those sides.

[0022] In this invention, the Munsell values ​​(hue, lightness, and saturation) of the base sheet color can be measured by the following method. <Method for measuring Munsell values ​​of color-blurred surface 6> The Munsell value of the color-blurred surface 6 can be determined by placing a standard white plate (Konica Minolta white calibration plate CM-A145) under the base sheet and measuring the color-blurred surface 6 with a colorimeter capable of measuring Munsell values ​​(for example, product name: CM-2600d, manufactured by Konica Minolta). The measurement is performed on 15 measurement points with a circular area of ​​8 mm in diameter as the measurement range, and the distance between the center points of each point is 15 mm or more. Preferably, the 15 measurement points are arranged in series, with 5 measurement points in the longitudinal direction of the base sheet and 3 measurement points in series in the short direction of the base sheet. The distance between the center points of the measurement points in series in the longitudinal direction is 40 mm, and the distance between the center points of the measurement points in series in the short direction is 15 mm. The 15 measurement points are arranged so that the center point of the central measurement point among the 15 measurement points coincides with the center point located in both the longitudinal and short directions of the base sheet (see Figure 6). If it is not possible to secure 15 measurement points due to reasons such as a small surface area on the base sheet, measurements should be taken at as many measurement points as possible. A D65 was used as the light source, and a MAV:φ8mm / φ11mm (measurement diameter / illumination diameter) was used as the target mask (attachment). The measurement diameter of the target mask (attachment) is the diameter of the measurement range.

[0023] For substrate sheets impregnated with liquid, measurements will be performed using substrate sheets dried by the following drying method, in order to suppress color changes. <Drying method for liquid-impregnated sheets> Drying is performed by thoroughly squeezing the liquid-impregnated sheet by hand to remove water, and then hanging it to dry in a room at a temperature of 20±2℃ and a relative humidity of 65±4% for at least one hour. After measuring the mass of the first sheet, the sheet is dried for another hour under the same conditions, and then the mass of the second sheet is measured. The second measurement A2 is compared with the first measurement A1, and if the mass difference (%) calculated by the following formula (1) is 0.1% or less, the sheet is considered to be sufficiently dry. Mass difference (%)=[(A1-A2) / A1]×100...(1) If the mass difference (%) is more than 0.1%, drying is further performed for 1 hour under the same conditions, and a third mass measurement is performed after drying. Then, taking the third measurement value as A2 and the second measurement value as A1, the mass difference (%) is calculated according to the above formula (1). If the calculated mass difference (%) is 0.1% or less, the sheet is considered to be sufficiently dried. On the other hand, if the calculated mass difference (%) is more than 0.1%, drying for another 1 hour and confirmation of the mass difference after drying are further performed under the same conditions. In this way, drying is repeated until the mass difference (%) becomes 0.1% or less.

[0024] In the present invention, the proportion of the number of measurement points for B-based hues can be calculated by the following method. <Method for calculating the proportion of the number of measurement points for B-based hues> When B hues with a hue of 0.1B or more and 10B or less, PB hues with a hue of 0.1PB or more and 7.4PB or less, or BG hues with a hue of 0.1BG or more and 10.0BG or less are defined as B-based hues, the proportion (%) of the number of measurement points for B-based hues can be obtained by dividing the number of measurement points for B-based hues by the total number of all measurement points, and multiplying the result by 100.

[0025] In the present invention, the average value and standard deviation of chroma on the color-blurred surface 6 can be calculated by the following method. <Method for calculating average value and standard deviation of chroma on color-blurred surface 6> For the average value of chroma, the average value of chroma for all measurement points is calculated without distinguishing whether the hue is B hue, PB hue, BG hue or any other hue, and this is defined as the "average value of chroma". For the standard deviation of chroma, the standard deviation of chroma for all measurement points is also calculated without distinguishing whether the hue is B hue, PB hue, BG hue or any other hue, and this is defined as the "standard deviation of chroma".

[0026] The liquid-impregnated sheet 1 only needs to have a color-blending surface 6 visible from the outer side, which is the side opposite to the wearer's skin, when worn around the neck, and it is acceptable for only one side to be the color-blending surface 6. If only one side is the color-blending surface 6, it is preferable to indicate on the packaging that it is preferable to use the sheet with the color-blending surface 6 facing the outer side (non-skin side). It is also preferable to indicate on the packaging that using the sheet with the color-blending surface 6 facing the outer side (non-skin side) will allow the color of the liquid-impregnated sheet to blend in with the skin.

[0027] The inventors of this invention have diligently researched ways to improve the color blending between the liquid-impregnated sheet and the wearer's skin, and have discovered that using a blue-based color that satisfies specific conditions as the color of the liquid-impregnated sheet 1 of the present invention improves color blending with the wearer's skin. Specifically, they have discovered that if the liquid-impregnated sheet 1 has a base sheet with a color-blending surface that satisfies conditions 1 and 2 above, color blending with the wearer's skin improves. As a result, when the liquid-impregnated sheet 1 of the present invention is worn around the neck, color blending with the wearer's skin can be improved. Here, color blending with the skin refers to the liquid-impregnated sheet 1 wrapped around the neck being inconspicuous in contrast to the skin color of the exposed skin. Conditions 1 and 2 above were derived from the inventors' many years of research and extensive experiments. From the viewpoint of improving color blending with the skin, the liquid-impregnated sheet of the present invention is particularly preferable for wear by people of East Asian descent.

[0028] From the viewpoint of more reliably achieving the effects of the present invention, assuming that condition 2 is met, the percentage of the number of measurement points for B-type hues is preferably 80% or more, more preferably 85% or more, preferably 100% or less, more preferably 90% or less, preferably 80% or more and 100% or less, and more preferably 85% or more and 90% or less.

[0029] Furthermore, the inventors diligently researched ways to improve the color blending between the liquid-impregnated sheet and the wearer's skin, and discovered that using a liquid-impregnated sheet whose saturation meets specific conditions, regardless of hue and lightness, improves color blending with the wearer's skin. Specifically, they found that if the liquid-impregnated sheet 1 has a base sheet with a color-blurring surface that satisfies condition 3, it improves color blending with the wearer's skin. As a result, when the liquid-impregnated sheet 1 of the present invention is worn around the neck, it improves color blending with the wearer's skin. Condition 3 was derived from the inventors' many years of research and extensive experiments.

[0030] Furthermore, from the viewpoint of more reliably achieving the effects of the present invention (first invention), assuming that condition 1 is met and the average value of saturation is 1.0 or higher, the standard deviation of saturation is preferably 0.40 or higher, more preferably 0.45 or higher, preferably 0.78 or lower, more preferably 0.70 or lower, even more preferably 0.55 or lower, even more preferably 0.52 or lower, preferably 0.40 or higher and 0.78 or lower, more preferably 0.40 or higher and 0.70 or lower, even more preferably 0.45 or higher and 0.55 or lower, and even more preferably 0.45 or higher and 0.52 or lower. Furthermore, from the viewpoint of more reliably achieving the effects of the present invention (second invention), assuming that the average value of saturation is 1.0 or higher, the standard deviation of saturation is preferably 0.40 or higher, more preferably 0.45 or higher, preferably 0.78 or lower, more preferably 0.70 or lower, even more preferably 0.55 or lower, even more preferably 0.52 or lower, preferably 0.40 or higher and 0.78 or lower, more preferably 0.40 or higher and 0.70 or lower, even more preferably 0.45 or higher and 0.55 or lower, and even more preferably 0.45 or higher and 0.52 or lower.

[0031] From the viewpoint of improving color blending with the wearer's skin, it is preferable that the color-blurring surface 6 satisfies the following condition 1A in addition to the conditions 1 and 2 described above. Condition 1A: All measurement points are B-hues with a hue of 0.1B to 10B, PB hues with a hue of 0.1PB to 7.4PB, or BG hues with a hue of 0.1BG to 10.0BG.

[0032] From the viewpoint of more reliably achieving the effects of the invention, the hue of condition 1A is preferably within the following range. At all measurement points, the hue of the B-series color is preferably 0.1B or higher, more preferably 5.0B or higher, even more preferably 6.0B or higher, preferably 10.0B or lower, more preferably 9.0B or lower, even more preferably 7.0B or lower, preferably 0.1B or higher and 10.0B or lower, more preferably 5.0B or higher and 9.0B or lower, even more preferably 6.0B or higher and 9.0B or lower, and even more preferably 6.0B or higher and 7.0B or lower. Furthermore, at all measurement points, the hue of the B-system color is preferably 0.1 PB or more, preferably 7.4 PB or less, more preferably 5.0 PB or less, even more preferably 3.0 PB or less, even more preferably 1.0 PB or less, preferably 0.1 PB or more and 7.4 PB or less, more preferably 0.1 PB or more and 5.0 PB or less, even more preferably 0.1 PB or more and 3.0 PB or less, and even more preferably 0.1 PB or more and 1.0 PB or less. Furthermore, at all measurement points, the hue of the BG system is preferably 0.1BG or higher, more preferably 1.0BG or higher, even more preferably 5.0BG or higher, even more preferably 9.0BG or higher, preferably 10.0BG or lower, preferably 0.1BG or higher and 10.0BG or lower, more preferably 1.0BG or higher and 10.0BG or lower, even more preferably 5.0BG or higher and 10.0BG or lower, and even more preferably 9.0BG or higher and 10.0BG or lower.

[0033] From the viewpoint of more reliably achieving the effects of the present invention, particularly the effects of the first invention, it is preferable that the color-blurring surface 6 satisfies conditions 1 and 2 and also satisfies the following condition 2A. Condition 2A: The average saturation value for measurement points of the B-type hue is 1.0 or higher, and the standard deviation is 0.40 or higher.

[0034] From the perspective of improving color blending with the wearer's skin, on the premise that conditions 1 and 2 are satisfied and the average chroma of measurement points in the B hue system is 1.0 or more, the standard deviation of chroma for measurement points in the B hue system is preferably 0.40 or more, more preferably 0.45 or more, preferably 0.78 or less, more preferably 0.70 or less, still more preferably 0.55 or less, even more preferably 0.52 or less, preferably 0.40 or more and 0.78 or less, more preferably 0.40 or more and 0.70 or less, still more preferably 0.45 or more and 0.55 or less, even more preferably 0.45 or more and 0.52 or less.

[0035] From the perspective of improving skin blending with a simple configuration and / or making it less likely to give the impression that the face and body are separated in appearance, it is preferable that the base sheet comprises a colored sheet and a nonwoven sheet laminated on the colored sheet, and the color-blurred surface 6 is formed by laminating the nonwoven sheet on the colored sheet. In this case, the surface on the nonwoven sheet side forms the color-blurred surface 6. It is also preferable to laminate nonwoven sheets on both sides of the colored sheet to form color-blurred surfaces on both sides of the base sheet. The liquid-impregnated sheet 1 allows the color of the colored sheet to be visible directly or indirectly through another sheet when the wearer of the liquid-impregnated sheet 1 is viewed from the front. The colored sheet may have color unevenness on the colored surface, or may be uniformly colored on the colored surface. In addition, the colored sheet is not limited to nonwoven fabrics made of fiber materials, and may be a colored resin film or the like. From the viewpoint of visibility, the basis weight of the nonwoven sheet laminated on the colored sheet is preferably 100 g / m 2 or less, more preferably 50 g / m 2 or less, still more preferably 45 g / m 2 or less, even more preferably 35 g / m 2 or less, still even more preferably 30 g / m 2 or less. From the viewpoint of use feeling, the basis weight of the nonwoven sheet laminated on the colored sheet is preferably 7.5 g / m 2 or more, more preferably 15 g / m 2More preferably 20 g / m² 2 That's all. Considering these factors, the basis weight of the nonwoven fabric sheet laminated onto the colored sheet is preferably 7.5 g / m². 2 More than 50g / m 2 More preferably, 7.5 g / m 2 More than 45g / m 2 More preferably, 15 g / m 2 More than 35g / m 2 Further, and more preferably, 20 g / m 2 More than 30g / m 2 The following applies:

[0036] The liquid-impregnated sheet 1 has a length in the longitudinal direction X of preferably 28 cm or more, more preferably 37 cm or more, and even more preferably 46 cm or more, from the viewpoint of securing the side regions B and C that are joined together in addition to the central region A that comes into contact with the neck, and from the viewpoint of improving color matching with the wearer's skin. There is no particular upper limit to the length in the longitudinal direction X, but for example, if it is too long, the fit around the neck may decrease or the portability may worsen, so from the viewpoint of ease of wrapping around the neck and improved handling, it is preferably 90 cm or less, and more preferably 70 cm or less.

[0037] From the viewpoint of improving color blending with the wearer's skin and / or reducing the impression that the face and body are separated, it is preferable that the liquid-impregnated sheet 1 is in contact with the neck with a certain width. From this viewpoint, the length L2 in the shorter direction Y of the liquid-impregnated sheet 1 is preferably 5 cm or more, more preferably 10 cm or more. Furthermore, from the viewpoint of fitting to the neck, the length L2 in the shorter direction Y is preferably 30 cm or less, more preferably 25 cm or less.

[0038] The standard neck circumference for children is approximately 27.5 cm for 8-year-old boys and approximately 26 cm for 8-year-old girls. From the viewpoint of ensuring sufficient length of the central region A as the area that comes into contact with the neck, ensuring sufficient length of the side regions B and C that connect to each other, and improving color matching with the wearer's skin, the length of the longitudinal direction X of the liquid-impregnated sheet 1 for children is preferably 28 cm or more, more preferably 37 cm or more. From the viewpoint of improving color matching with the wearer's skin, the length L2 of the short direction Y of the liquid-impregnated sheet 1 for children is preferably 5 cm or more, more preferably 10 cm or more. The standard neck circumference for adults is approximately 37 cm for 30-year-old men and approximately 32 cm for 30-year-old women. The liquid-impregnated sheet 1 for adults is preferably 37 cm or longer, more preferably 46 cm or longer, from the viewpoint of ensuring sufficient length of the central region A as the area that comes into contact with the neck, ensuring sufficient length of the side regions B and C that connect to each other, and improving color matching with the wearer's skin. The liquid-impregnated sheet 1 for adults has a length L2 in the shorter direction Y that is preferably 5 cm or longer, more preferably 10 cm or longer, from the viewpoint of improving color matching with the wearer's skin.

[0039] The liquid-impregnated sheet 1 preferably has perforations 2 in the central region A. The central region A is the region intended to come into contact with the neck, but since there are differences in the neck circumference of wearers due to age and individual differences, even with the same liquid-impregnated sheet 1, the length that comes into contact with the neck will vary depending on the wearer. Therefore, in the present invention, the central region A is defined as the region on both sides of the central position Cx in the longitudinal direction X of the liquid-impregnated sheet 1, where the distance L3 from the central position Cx is within 15 cm. Here, the central region A is a region with a length La in the longitudinal direction X of 30 cm, and the center position that divides this length La in half coincides with the central position Cx of the liquid-impregnated sheet 1. The central position Cx in the longitudinal direction X of the liquid-impregnated sheet 1 is the position that divides the length L1 in the longitudinal direction X of the liquid-impregnated sheet 1 in half. Furthermore, if the area is clearly positioned around the neck, the central area A is not limited to areas where the distance L3 from the central position Cx is within 15 cm on each side of the central position Cx.

[0040] The liquid-impregnated sheet 1 of the present invention preferably has at least one perforation 2 in the central region A, and more preferably has multiple perforations 2. The perforations 2 are designed to allow the liquid-impregnated sheet 1 to be torn by hand without the use of tools, and to be divided along the longitudinal direction X, at the position where the perforations 2 are formed along the longitudinal direction X. Preferably, the length of the perforations 2 at the position where the perforations 2 are formed along the longitudinal direction X is 90% or more, more preferably 95%, and even more preferably 100%, when the length of the short side of the sheet from one edge 1a to the other edge 1b along the longitudinal direction X is taken as 100%. The perforations 2 may be parallel to the longitudinal center line Ly extending in the short direction Y, or they may have a slight incline, for example, an incline of 30% or less. However, it is preferable that the perforations 2 be parallel to the longitudinal center line Ly, from the viewpoint of making it easier to tear the liquid-impregnated sheet 1 at the perforations 2, even when the liquid-impregnated sheet 1 is folded in two, three, four, etc., along the fold line extending in the longitudinal direction X.

[0041] The scenario in which the liquid-impregnated sheet 1 is released by tearing the perforations 2 is typically when the wearer or a guardian intentionally removes it. For example, this could occur if the side regions B and C are connected but the connection cannot be easily released, or if the liquid-impregnated sheet 1 needs to be removed more quickly than the side regions B and C can be released due to various circumstances such as the sheet tightening around the neck. The scenario in which the perforations 2 are broken and the liquid-impregnated sheet 1 is released is not limited to situations where it is intentionally removed. For example, while the liquid-impregnated sheet 1 is worn around the neck during activities, it may get caught on an unexpected obstacle such as a fence, playground equipment, a seat, or a part of another person's body. In such a case, it is desirable from the standpoint of mitigating or preventing the wearer's neck from becoming constricted and harming their health if the perforations 2 are broken and the liquid-impregnated sheet 1 is released, regardless of the wearer's or another person's intentions.

[0042] The liquid-impregnated sheet 1 is used by wrapping it around the neck after the base sheet has been impregnated with liquid. The liquid impregnated in the base sheet is preferably a water-containing liquid. The water-containing liquid is either water or has water as its main component. The water-containing liquid has a water content of at least 50% by mass of the total mass of the liquid, preferably 55% by mass or more, more preferably 60% by mass or more, and even more preferably 65% ​​by mass or more. The liquid-impregnated sheet 1 is preferably used for cooling around the neck. If the liquid-impregnated sheet 1 is used for cooling around the neck, the base sheet only needs to contain a liquid containing at least water, but from the viewpoint of providing a cooling sensation, it is preferable that the liquid impregnated in the base sheet contains a cooling component. Examples of cooling ingredients include menthol or its derivatives such as l-menthol, menthyl acetate, menthyl lactate, l-menthyl glyceryl ether, and menthylpyrrolidone carboxylic acid; menthol analogs such as N-ethyl-p-menthanecarboxamide; dl-camphor, isopulegol, cineole, borneol, thymol and their derivatives, as well as 3-l-methoxypropanediol and menthol-containing essential oils such as peppermint oil and spearmint oil. In addition to its function as a cooling ingredient, the cooling ingredient may also have other functions, such as a fragrance.

[0043] From the viewpoint of enhancing the cooling sensation and / or its duration, the content of the cooling component in the liquid is preferably 0.015% by mass or more, more preferably 0.04% by mass or more, and even more preferably 0.05% by mass or more, relative to the total amount of liquid. Furthermore, from the viewpoint of suppressing irritation when worn around the neck for a predetermined period of time, it is preferably 0.7% by mass or less, more preferably 0.6% by mass or less, and even more preferably 0.5% by mass or less. The liquid impregnated into the base sheet may contain components other than water and a cooling agent. For example, it may be a cosmetic composition containing a cooling agent, ethanol, and water, as described in Japanese Patent Publication No. 2021-88547.

[0044] From the viewpoint of providing a cooling sensation, the liquid-impregnated sheet 1 preferably has an impregnation rate of 270% by mass or more, more preferably 300% by mass or more, and even more preferably 330% by mass or more. From the viewpoint of preventing dripping, the liquid-impregnated sheet 1 preferably has an impregnation rate of the liquid of 1000% by mass or less, more preferably 950% by mass or less, and even more preferably 900% by mass or less. From the viewpoint of providing a cooling sensation and preventing dripping, the impregnation rate of the liquid is preferably 270% by mass or more and 1000% by mass or less, more preferably 300% by mass or more and 950% by mass or less, and even more preferably 330% by mass or more and 900% by mass or less. The liquid impregnation rate (mass %) is the ratio of the mass of the liquid to the mass of the base sheet, expressed as a percentage. In other words, the liquid impregnation rate is the percentage increase in mass of the base sheet after it has been impregnated with the liquid, compared to before impregnation.

[0045] The liquid impregnation rate can be measured specifically as follows: <Method for measuring liquid impregnation rate> First, measure the mass a of the liquid-impregnated sheet 1. From the viewpoint of preventing the mass a from changing due to the evaporation of the liquid impregnated in the liquid-impregnated sheet 1, it is preferable that the liquid-impregnated sheet 1 used for measuring the mass a is one that has just been manufactured. If the liquid-impregnated sheet 1 is sealed in a packaging bag or the like after manufacturing and stored in that state, it is preferable to measure the mass a immediately after removing the liquid-impregnated sheet 1 from the packaging bag or the like. Next, the liquid-impregnated sheet 1 is thoroughly washed with water and dried, and then the mass of the sheet is measured for the first time. The sheet is dried by squeezing it well by hand to remove water, and then hanging it to dry in a room at a temperature of 20±2℃ and a relative humidity of 65±4% for at least one hour. After measuring the mass of the sheet for the first time, the sheet is dried for another hour under the same conditions, and then the mass of the sheet is measured for the second time. The second measurement value W2 is compared with the first measurement value W1, and if the mass difference (%) calculated by the following formula (2) is 0.1% or less, the second measurement value W2 is taken as the mass b of the sheet after drying. Mass difference (%)=[(W1-W2) / W1]×100...(2)

[0046] If the mass difference (%) is greater than 0.1%, the sheet is dried for another hour under the same conditions, and the mass is measured a third time after drying. The third measurement is taken as W2 and the second measurement as W1, and the mass difference (%) is calculated according to formula (1). If it is 0.1% or less, the mass of the sheet after drying is taken as the third measurement W2. On the other hand, if it is greater than 0.1%, the sheet is dried for another hour under the same conditions, and the mass difference after drying is checked. In this manner, drying is repeated until the mass difference (%) becomes 0.1% or less, and the measured mass at the Nth measurement when the mass difference becomes 0.1% or less is defined as the dried mass b. The dried mass b corresponds to the mass of the base sheet mentioned above. Then, the liquid impregnation rate is calculated from the mass a of the liquid-impregnated sheet 1 (the sheet in the state of being impregnated with liquid) and the mass b after drying using the following formula (3). Liquid impregnation rate (%) = (ab) / b × 100 ... (3)

[0047] The liquid-impregnated sheet 1 is preferably distributed to the market as a sealed package sealed in a sealed container so that the liquid-impregnated state is maintained for a long period of time. The sealed container may be a bag container made of flexible packaging material such as a three-sided bag with a zipper or a pillow container, or it may be a packaging container made of a resin molded body. Examples of packaging containers made of resin molded bodies include cylindrical or rectangular tubular containers that allow multiple sheets contained inside to be pulled out and have an opening that can be opened and closed by a lid. The liquid-impregnated sheet 1 contained in the sealed container may be in any state, for example, a stack of sheets in an unfolded state, a stack of sheets or a single sheet that is folded, rolled up, or rolled up after being folded. Methods of folding the sheet include folding it in half, in thirds, or in quarters, or folding it in half, in thirds, or in quarters in one direction and then folding it in half, in thirds, or in quarters in a direction perpendicular to that direction.

[0048] The present invention is not limited to the embodiments described above and can be modified as appropriate. For example, as a method for connecting the side regions B and C, a method of connecting them together may be adopted. When connecting side regions B and C, various known knots can be used without particular restriction. Examples include bow knots, ribbon knots, square knots, single splices (loom knots), fishing line knots (fisherman's knots), and figure-eight knots.

[0049] Furthermore, the planar shape of the liquid-impregnated sheet may be any shape having a longitudinal direction X and a transverse direction Y. This may be a rectangle with a long side and a transverse side shorter than the long side, or a rectangle with both ends or four corners in the longitudinal direction being arc-shaped, an ellipse with a major axis and a transverse axis shorter than the major axis, or a rectangle with semicircles added to both ends. From the viewpoint of ease of manufacturing and / or handling, a rectangular planar shape is preferred.

[0050] Furthermore, instead of attaching the liquid-impregnated sheet 1 around the neck in an unfolded state, it may be attached in a folded state, such as a two-fold, three-fold, or four-fold, along a fold line extending in the longitudinal direction X. In this case, it is preferable to attach it so that the colored sheet is visible to a third party. [Examples]

[0051] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to these examples. [Examples 1 to 4 and Comparative Examples 1 to 4] The base sheet has a structure in which two layers of white nonwoven fabric made of rayon fibers are laminated on both sides of a white nonwoven fabric made of pulp fibers, with a basis weight of 60 g / m². 2 A nonwoven fabric with a three-layer structure was used, which was then colored by spraying it with a coloring agent. [Example 5] The base sheet has a three-layer structure consisting of a colored nonwoven fabric made of polypropylene fibers laminated on both sides with two white nonwoven fabrics made of rayon fibers, with a basis weight of 60 g / m². 2 Nonwoven fabric was used. For each example and comparative example, the Munsell values ​​of the color-blurred surface of the substrate sheet were measured using the method described above. The proportion of measurement points for B-type hues was also calculated using the method described above. Furthermore, the average value and standard deviation of saturation were calculated using the method described above. The average hue value was calculated by classifying the hue into B hue, PB hue, BG hue, or other hues, and then calculating the average hue value for each classification. This was defined as the "average hue value." The average value of lightness was calculated by taking the average value of lightness for all measurement points, without distinguishing between B hue, PB hue, BG hue, or other hues, and this was defined as the "average value of lightness." Similarly, the standard deviation of lightness was calculated by taking the standard deviation of lightness for all measurement points, without distinguishing between B hue, PB hue, BG hue, or other hues, and this was defined as the "standard deviation of lightness." These results are shown in Table 1.

[0052] [Skin-friendly effect when liquid-impregnated sheet 1 is wrapped around the neck] Liquid-impregnated sheets 1 having the same configuration as the embodiment shown in Figure 1 were prepared by impregnating the base sheets of each example and comparative example with liquid. Water was used as the liquid. Five Japanese female expert panelists aged 28 to 48 wore the prepared liquid-impregnated sheets and evaluated how well they fit their skin based on the evaluation criteria below. The average score of the five expert panelists was calculated, and the skin fit of the liquid-impregnated sheets when wrapped around the neck was evaluated based on the evaluation score below. An evaluation score of C or higher is considered a passing grade. (Evaluation Criteria) 6: I strongly feel that way. 5: I feel that way 4: I feel that way somewhat. 3: I can't say either way. 2: I don't really feel that way. 1: I don't feel that way. (Evaluation score) A: Average value of 6 or higher B: Average value 5 or higher but less than 6 C: Average value, 4 or higher but less than 5 D: Average value 3 or more and less than 4 E: Average value 2 or more but less than 3 F: Average value less than 2

[0053] [Table 1]

[0054] As is clear from the results shown in Table 1, the liquid-impregnated sheets of each embodiment of the present invention (first invention) can improve color matching with the skin.

[0055] For Examples 1 to 5 and Comparative Examples 1 to 4, the evaluation criteria were changed to whether or not the face and body appear separated in appearance, but the degree to which the skin-friendly effect was not perceived was evaluated in the same manner as described above. The results are shown in Table 1. For Examples 1 to 5, the evaluation score was C or higher, while for Comparative Examples 1 to 4, the evaluation score was E or F. From this, it can be seen that the present invention (second invention) makes it less likely to give the impression that the face and body are separated in appearance. [Explanation of symbols]

[0056] 1. Liquid-impregnated sheet 2 perforations 5 hole 6-color blended surface

Claims

1. A liquid-impregnated sheet having a base sheet containing fibrous material, which is impregnated with liquid and used by being wrapped around the neck, The aforementioned base sheet has a longitudinal direction and a transverse direction, and is provided with a color-blurring surface. The aforementioned color-blurred surface is, A liquid-impregnated sheet that satisfies the following conditions 1 and 2 when Munsell values ​​are measured using a colorimeter capable of measuring Munsell values, within a circular area with a diameter of 8 mm, at 15 measurement points spaced at least 15 mm apart from each other. Condition 1: The proportion of measurement points with B-type hues (hue range 0.1B to 10B), PB-type hue (hue range 0.1PB to 7.4PB), or BG-type hue (hue range 0.1BG to 10.0BG) relative to the total number of measurement points must be 80% or more. Condition 2: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

2. A liquid-impregnated sheet according to claim 1, satisfying the following condition 2A. Condition 2A: The average saturation value for the measurement points of the B-system hue is 1.0 or higher, and the standard deviation is 0.40 or higher.

3. A liquid-impregnated sheet according to claim 1 or 2, satisfying the following condition 1A. Condition 1A: All measurement points are B-hues with a hue of 0.1B to 10B, PB hues with a hue of 0.1PB to 7.4PB, or BG hues with a hue of 0.1BG to 10.0BG.

4. The base sheet comprises a colored sheet and a nonwoven fabric sheet laminated on the colored sheet. The aforementioned nonwoven fabric sheet has a basis weight of 100 g / m². ２ The liquid-impregnated sheet according to claim 1 or 2, wherein the side facing the nonwoven fabric sheet forms the color-blurred surface.

5. The liquid-impregnated sheet according to claim 1 or 2, wherein the length in the longitudinal direction is 28 cm or more and the length in the short direction is 5 cm or more.

6. The liquid-impregnated sheet according to claim 1 or 2, wherein the liquid contains a cooling component.

7. A liquid-impregnated sheet having a base sheet containing fibrous material, which is impregnated with liquid and used by being wrapped around the neck, The aforementioned base sheet has a longitudinal direction and a transverse direction, and is provided with a color-blurring surface. The aforementioned color-blurred surface is, A liquid-impregnated sheet that satisfies condition 3 below when Munsell values ​​are measured using a colorimeter capable of measuring Munsell values, within a circular area with a diameter of 8 mm, at 15 measurement points spaced at least 15 mm apart from each other. Condition 3: The average saturation value for all measurement points is 1.0 or higher, and the standard deviation is 0.40 or higher.

8. The base sheet comprises a colored sheet and a nonwoven fabric sheet laminated on the colored sheet. The aforementioned nonwoven fabric sheet has a basis weight of 100 g / m². ２ The liquid-impregnated sheet according to claim 7, wherein the value is less than the value of the nonwoven fabric sheet, and the side facing the nonwoven fabric sheet forms the color-blurred surface.

9. The liquid-impregnated sheet according to claim 7 or 8, wherein the length in the longitudinal direction is 37 cm or more and the length in the short direction is 5 cm or more.

10. The liquid-impregnated sheet according to claim 7 or 8, wherein the liquid contains a cooling component.

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