wet wipes

Abstract

To provide a wet wipe, even when a piece of paper is used as a sheet to be impregnated with chemical solution and laminated in a six-fold or more folded state, having excellent texture and compactness and being hardly torn.SOLUTION: A wet wipe is formed by impregnating a sheet made from paper containing at least pulp fibers with chemical solution and laminating the sheet made from paper in a six-fold or more folded state, where WC (work of compression) when the sheet is compressed by a KES compression test machine is 0.15 gf cm / cm2 or more and 0.65 gf cm / cm2 or less, and the tensile strength of the sheet in a wet state is 2.2 N / 25 mm or more and 3.8 N / 25 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a wet tissue made of paper impregnated with a chemical solution. [Background technology]

[0002] Wet wipe products are generally manufactured by impregnating sheets made of nonwoven fabric or paper with a liquid disinfectant.

[0003] Wet wipes come in various packaging and container types, including bottle, pillow, and handheld. In particular, the market for the compact, portable handheld type is expanding due to the increasing frequency of hand-wiping and disinfecting hands while out and about.

[0004] Many handheld wipes feature folded sheets stacked on top of each other, allowing users to take out one sheet at a time without popping them up. The folding method is designed to ensure compactness and ease of use.

[0005] As an example of such a handy type of wet tissue, Patent Document 1 discloses an ultra-mini wet tissue package in which an opening is provided on the packaging bag, a sheet-like opening / closing lid is provided on the opening, the width of the opening is 15-30 mm and the length is 25-50 mm, both sides of the opening in the longitudinal direction are arc-shaped, and the wet tissue laminate consists of multiple independent single tissues that are folded and then laminated together in the thickness direction, with the length of the folded tissue body being 70-80 mm, the width being 32.5-37.5 mm and the height being 6-20 mm. It also discloses an ultra-mini wet tissue package in which the length is 83-105 mm, the width is 38.5-41 mm and the height is 8-22 mm, the sheet-like opening / closing lid is opened when in use, and the wet tissue is pulled out from the gap in the packaging bag, and a peel-stopping part is provided on the opening / closing lid to prevent the sheet-like opening / closing lid from peeling off the packaging bag.

[0006] Furthermore, Patent Document 2 discloses a wet wipe packaging in which a plurality of wet wipes are stored stacked inside a packaging body comprising a bag-shaped bag body having an opening and a lid material that covers the opening so as to be openable and closable, and wet wipes are taken out one by one from the opening for use, wherein the wet wipes have a tab formed on the upper surface side at a position facing the opening when stored in the packaging body by being folded in the longitudinal or width direction, and folded portions formed by folding downward in an S-shape or Z-shape at both ends in the longitudinal or width direction in the direction in which the tab is not formed. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Utility Model Registration No. 3220555 Gazette [Patent Document 2] Japanese Patent Publication No. 2013-075674 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In recent years, with the growing environmental awareness, there has been a demand for paper-based wet wipes that do not use plastic in the sheets. In particular, for handy-type products used on the go, there is a growing demand for paper sheets due to advantages such as ease of sorting after use and biodegradability. However, when using paper for handy-type sheets, the sheets have many folds in order to fold them compactly, which creates a problem where the sheets are prone to tearing at the folds.

[0009] Loosening the folding process to prevent creases would prevent compact stacking, reducing portability. Conversely, increasing the paper's strength to prevent tearing would compromise its texture. Furthermore, when paper is used for the sheet, the sheets tend to stick to each other, making it difficult to take out the sheets one by one when taking them out, and there is a problem that they tend to come out in a stuck state.

[0010] When paper is used for the sheet of the wet tissue in this way to make a handy-type product, it has been difficult to make a wet tissue that is excellent in texture and compactness and is hard to break.

[0011] The present invention has been made in view of such circumstances, and even when paper is used for a sheet impregnated with a chemical solution and laminated in a six-fold or more folded state, it provides a wet tissue that is excellent in texture and compactness and is hard to break.

Means for Solving the Problems

[0012] The inventor conducted intensive studies and found that in a wet tissue in which a paper sheet containing at least pulp fibers is impregnated with a chemical solution and laminated in a six-fold or more folded state, by setting the WC (compression work amount) when compressed by a KES compression tester and the tensile strength when wet within predetermined numerical ranges in the sheet, a wet tissue that is excellent in texture and compactness and is hard to break can be obtained, and the present invention has been completed. That is, the present invention provides the following.

[0013] (1) A first aspect of the present invention is a wet tissue in which a paper sheet containing at least pulp fibers is impregnated with a chemical solution and laminated in a six-fold or more folded state, wherein the WC (compression work amount) when the sheet is compressed by a KES compression tester is 0.15 gf·cm / cm 2 or more and 0.65 gf·cm / cm 2 or less, and the tensile strength when wet in the sheet is 2.2 N / 25 mm or more and 3.8 N / 25 mm or less.

[0014] (2) A second aspect of the present invention is a wet tissue as described in (1), wherein the sheet is subjected to a KES compression test of 50 gf / cm². 2 The thickness of the sheet when the load is applied is T m , 0.5 gf / cm 2 When the thickness of the sheet under load is T0, (T0-T m It is characterized by the fact that ) / T0 is 0.40 or greater.

[0015] (3) A third aspect of the present invention is a wet tissue as described in (1), wherein the sheet is subjected to a KES compression test of 50 gf / cm². 2 The thickness T of the sheet when the load is applied. m However, it is characterized by having a thickness of 160 μm or more and 440 μm or less.

[0016] (4) A fourth aspect of the present invention is a wet tissue as described in (1), wherein the sheet has a pattern of irregularities on its surface derived from a paper machine, and the combined height of the recesses and protrusions in the irregularities is 100 μm or more and 300 μm or less. [Effects of the Invention]

[0017] According to the present invention, even when paper is used for the sheets impregnated with a chemical solution and the sheets are folded into six or more layers and laminated, it is possible to provide wet tissues that are excellent in texture and compactness, and that are resistant to tearing. [Brief explanation of the drawing]

[0018] [Figure 1] This is a perspective view of a wet tissue according to one embodiment of the present invention. [Figure 2] This is an XY plane image of the height profile (mapping) of the sheet obtained by microscopy. [Figure 3] Figure 2(b) shows the image of the height profile (measured cross-sectional curve S) of the unevenness along the line segment S1-S2. [Figure 4]This is an image of the roughness curve W after processing the (measured) cross-sectional curve S shown in Figure 3. [Figure 5] This figure shows how to determine the height of the unevenness in the sheet originating from the paper machine, as shown in Figure 4. [Figure 6] This is a schematic diagram of the areas in the papermaking process where irregularities originating from the papermaking machine are added to the sheet. [Modes for carrying out the invention]

[0019] The following describes in detail embodiments for carrying out the present invention (hereinafter simply referred to as "this embodiment"). This embodiment is illustrative for explaining the present invention and is not intended to limit the present invention to the following content. The present invention can be implemented by modifying it as appropriate within the scope of its gist. Furthermore, in the context of wet tissues, the MD direction refers to the conveyance direction (Machine Direction) during sheet manufacturing, while the CD direction refers to the width direction (Cross Direction) perpendicular to the conveyance direction.

[0020] <Wet wipes> The wet tissue 1 according to this embodiment is a wet tissue 1 in which a paper sheet 2 containing at least pulp fibers is impregnated with a chemical solution and then folded into six or more layers and laminated. Because sheet 2 is made of paper and does not contain synthetic fibers, it is highly biodegradable and economically advantageous, resulting in a highly economical wet tissue 1. Sheet 2 is preferably 1-ply or 2-ply, and more preferably 1-ply.

[0021] Furthermore, the method of folding sheet 2 into six sections is not particularly limited as long as it is a folding method commonly used for wet tissues or wet wipes, but one example is to fold one side of sheet 2 in a mountain fold and the other side in a valley fold (Z fold) so as to divide the short side of sheet 2 into approximately four equal parts, and then fold either the mountain fold or the valley fold (half fold) so as to divide the long side into approximately two equal parts.

[0022] Figure 1 is a perspective view of a wet tissue 1 according to one embodiment of the present invention. As shown in Figure 1, the wet tissue 1 consists of sheets 2 impregnated with a liquid medicine and folded into six or more layers, which are then packaged by a packaging body 3. The shape of the packaging 3 is not particularly limited, but from the viewpoint of compactness, it is preferable that it be made of a flexible and water-impermeable packaging film as shown in Figure 1. Furthermore, it is preferable that the packaging 3 has an opening 4 for removal.

[0023] (Sheet) The pulp fibers used in Sheet 2 can be general pulp fibers (wood pulp) such as bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP). Among these, it is preferable to include bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP). Furthermore, the content ratio of NBKP to LBKP in the pulp fibers is preferably 50:50 or more and 100:0 or less, more preferably 70:30 or more and 100:0 or less, even more preferably 90:10 or more and 100:0 or less, and most preferably 100:0. Preferred NBKP fibers include those made from radiata pine, slush pine, southern pine, lodgepole pine, spruce, and Douglas fir. NUKP can be used instead of NBKP, and LUKP can be used instead of LBKP.

[0024] Furthermore, the liquid solution impregnated into sheet 2 can be a mixture of alcohol, humectants, preservatives, antibacterial agents, stabilizers, etc., which are commonly used in wet wipes. In this case, it is preferable that the impregnation ratio of the liquid onto sheet 2 is between 2 and 4 times. If the impregnation ratio is less than 2 times, the wetting is insufficient, resulting in a poor texture for the wet tissue 1, and if it exceeds 4 times, sheet 2 becomes prone to tearing.

[0025] The impregnation ratio is measured by first measuring the area and weight of wet tissue 1 (sheet 2 impregnated with the chemical solution), then washing wet tissue 1 with an alcohol solution and drying it completely. After drying, the sheet 2 is humidified at 23°C and 50% RH and its weight is measured. The weight of the chemical solution impregnated per gram of paper is then defined as the impregnation ratio. Furthermore, the impregnation ratio is more preferably 2.3 times or more and 3.5 times or less, and even more preferably 2.5 times or more and 3.2 times or less.

[0026] Furthermore, in order to facilitate the optimization of the tensile strength of sheet 2 when wet, as described later, it is preferable that sheet 2 is not hydrolytic. Also, in order to avoid being limited to equipment such as embossing rolls during manufacturing, and to avoid a decrease in sheet strength due to embossing, and to facilitate the optimization of the tensile strength as described later, it is preferable that sheet 2 does not have any irregularities on either side due to embossing, which are not derived from the paper machine described later.

[0027] Furthermore, sheet 2 has a surface pattern of irregularities originating from the paper machine, distinct from embossing, and it is preferable that the combined height of the convex and concave parts of the irregularities is between 100 μm and 300 μm. If the height of the irregularities is less than 100 μm, the sheets 2 will stick together, making it difficult to remove them one by one. If the height of the irregularities exceeds 300 μm, the bulk of sheet 2 will be too high, resulting in poor compactness when stacked. By keeping the height of the irregularities within the above numerical range, the contact points between sheets 2 are reduced during the process of pressing them in an adjacent (stacked) state, making them less likely to stick together and thus easier to remove one by one. The combined height of the convex and concave portions is preferably between 130 μm and 270 μm, and more preferably between 150 μm and 250 μm. Furthermore, irregularities originating from the paper machine can be adjusted using common methods such as crepe ratio and wet crepe.

[0028] The height of the irregularities on Sheet 2 originating from the paper machine is measured using a microscope. The KEYENCE VR-3100 One-Shot 3D Measurement Macroscope can be used. The VR-H1A software can be used for observing, measuring, and analyzing the microscope images. The measurement conditions are a magnification of 12x and a field of view of 24mm x 18mm. The magnification and field of view may be adjusted as needed depending on the desired size of the irregularities. While 3D measuring machines and contour measuring machines measure points or lines, one-shot 3D measurement measures the entire surface, making it easier to understand the overall shape and curvature.

[0029] Referring to Figures 2 to 5, a specific method for measuring the height of irregularities originating from the paper machine will be explained. The measurement will be performed on sheet 2 (wet tissue 1) impregnated with a chemical solution. Figure 2(a) is an XY plane image of the height profile (mapping) obtained by a microscope. In Figure 2, the vertical direction is the horizontal direction of Sheet 2, and the left-right direction is the vertical direction of Sheet 2. As shown in Figure 2(b), if a line segment S1-S2 parallel to the vertical direction is drawn at any position in the XY plane image of the height profile (mapping), the height profile of the irregularities ((measured) cross-sectional curve S) shown in Figure 3 is obtained. Note that each irregularity extends along the vertical direction, and the line segment S1-S2 crosses multiple irregularities, so the height profile of the irregularities hardly changes regardless of where the line segment S1-S2 is drawn in the vertical direction of the XY plane image.

[0030] Here, the height profile is the (measured) cross-sectional curve S that represents the actual surface irregularities of sheet 2, but it also contains noise (steep peaks caused by fiber clumps on the surface of sheet 2, fibers extending in a whisker-like manner, or areas without fibers). Therefore, when calculating the height of the irregularities, it is necessary to remove such noise peaks. Therefore, the (measurement) cross-sectional curve S in FIG. 3 is used with the filter size of the weighted average radio button set to ±12, and the roughness curve W in FIG. 4 after smoothing is obtained. Note that the smoothing using the filter of the weighted average radio button can be automatically obtained by using the above analysis software.

[0031] Regarding the obtained roughness curve W, as shown in FIG. 5, the difference in the vertical axis between the convex part and the adjacent concave part is measured at 10 locations (H1 to H10), and the average is taken as the height of the unevenness (Rc). Also, three line segments S1 - S2 are set for each height profile 1 image, and three roughness curves W in FIG. 4 are obtained. Then, Rc is determined for each of these three roughness curves W. Three images of the sample are prepared, and the height of the unevenness obtained by averaging a total of nine data (Rc) is adopted.

[0032] (Physical properties of the sheet) The basis weight of Sheet 2 in the absolutely dry state is 20 g / m 2 to 50 g / m 2 or less, which is preferable. If the basis weight is less than 20 g / m 2 , Sheet 2 will have poor texture, and if it exceeds 50 g / m 2 , it will be too bulky and the wet tissue 1 will be inferior in compactness. The basis weight of Sheet 2 in the absolutely dry state is measured in accordance with JIS P 8124. Note that the basis weight of Sheet 2 in the absolutely dry state is 25 g / m 2 to 45 g / m 2 or less, which is more preferable, and 30 g / m 2 to 40 g / m 2 or less, which is even more preferable.

[0033] Also, the tensile strength of Sheet 2 in the wet state in this embodiment is 2.2 N / 25 mm or more and 3.8 N / 25 mm or less. If the tensile strength is less than 2.2 N / 25 mm, Sheet 2 is likely to break, and if it exceeds 3.8 N / 25 mm, the texture of Sheet 2 will deteriorate. Note that the tensile strength of Sheet 2 in the wet state is preferably 2.4 N / 25 mm or more and 3.6 N / 25 mm or less, and more preferably 2.6 N / 25 mm or more and 3.3 N / 25 mm or less.

[0034] The tensile strength in a wet state is measured by pulling one sheet 2 from the laminated wet tissue 1, cutting it to a width of 25 mm, and then measuring it using a tensile testing machine with a grip width of 100 mm and an elongation speed of 300 ± 5 mm / min, and taking the average of 10 measurements. In this case, the tensile strength refers to the tensile strength of sheet 2 in the CD direction. Furthermore, the tensile strength of sheet 2 when wet can be adjusted by common methods such as adding a wet strength agent during the papermaking process. Similarly, the longitudinal and transverse (MD and CD directions) of sheet 2 can also be adjusted by fiber orientation.

[0035] Additionally, sheet 2 was subjected to a KES compression test to achieve a compression of 50 gf / cm². 2 The thickness T of sheet 2 when the load is applied. m It is preferable that the thickness is between 160 μm and 440 μm. m If the thickness is less than 160 μm, the texture of sheet 2 when held in the hand will be inferior, and if it exceeds 440 μm, the bulk of sheet 2 will be too high, resulting in poor compactness when laminated. Note that the thickness T m It is more preferable that the thickness is between 200 μm and 400 μm, and even more preferable that it is between 250 μm and 350 μm.

[0036] Furthermore, the KES compression tester measured 0.5 gf / cm². 2 When the thickness of sheet 2 under the applied load is T0, (T0-T m It is preferable that ) / T0 is 0.40 or greater. If the value is less than 0.40, creases are more likely to form on sheet 2. Note (T0-T m ) / T0 is more preferably 0.45 or greater, and even more preferably 0.50 or greater and 0.55 or less.

[0037] Furthermore, it is preferable that T0 is between 400 μm and 800 μm. If T0 is less than 400 μm, the texture of the sheet 2 when held in the hand will be inferior, and if it exceeds 800 μm, the bulk of the sheet 2 will be too high, resulting in poor compactness when laminated. Furthermore, T0 is more preferably 500 μm to 780 μm, and even more preferably 600 μm to 750 μm. m Furthermore, T0 can be adjusted by the unevenness of the sheet 2 originating from the paper machine and the basis weight in the completely dry state.

[0038] Furthermore, in relation to the thickness mentioned above, the WC (work of compression) when sheet 2 was compressed using a KES compression tester was 0.15 gf·cm / cm 2 More than 0.65gf cm / cm 2 The following is true: WC is 0.15 gf·cm / cm 2 If it is less than 0.65 gf·cm / cm, creases are more likely to form on sheet 2. 2 If it exceeds this limit, the bulk of sheet 2 becomes too high, resulting in poor compactness when stacked. Note that WC (work of compression) is 0.25 gf·cm / cm 2 More than 0.55gf cm / cm 2 Preferably, it is 0.35 gf·cm / cm 2 More than 0.50gf cm / cm 2 The following is more preferable: WC (work of compression) can be adjusted by the irregularities in sheet 2 originating from the paper machine, the basis weight in the completely dry state, and the tensile strength when wet.

[0039] Thickness and WC (wall pressure) are measured using a KES-G5 automated compression tester (manufactured by Kato Tech Co., Ltd.). 2cm 2 A sample, made by cutting a wet tissue 1 (a sheet 2 impregnated with a chemical solution) to a size of 140 mm x 200 mm, is placed between the pressure plate and the pressure receiving plate. The pressure plate is then lowered at a speed of 0.020 cm / sec, and the change in pressure and the thickness of the sample at that time are measured. T0 is a pressure of 0.5 gf / cm². 2This is the thickness of the sample (μm) at T m The pressure is 50 gf / cm². 2 This is the thickness (μm) of the sample at T0 and T m The value of is calculated as the average of 10 measurements. Similarly, WC is the compression work, and the average of 10 measurements is also calculated.

[0040] (Method of manufacturing wet tissues) The wet tissue 1 according to this embodiment can be manufactured using the same process as ordinary wet tissue products. Specifically, the wet tissue 1 (a laminate of sheets 2) can be obtained by the following steps: (1) papermaking and creping, (2) cutting, and (3) folding, lamination, and chemical impregnation. The timing of chemical impregnation can be either before or after lamination, and lamination and impregnation may be performed simultaneously. In this case, the number of sheets 2 stacked (for each package 3 described later) is not particularly limited as long as it does not compromise compactness, but it is preferable that it be between 10 and 50 sheets.

[0041] In the papermaking process, it is preferable that the sheet 2 has a pattern of irregularities originating from the papermaking machine, as described above. Having this pattern of irregularities allows the T of the sheet 2 to be formed. m This makes it easier to optimize thicknesses such as T0 and WC. Note that "originating from the paper machine" means that in the papermaking process of sheet 2, it is applied between the headbox of the paper machine and the inlet of the Yankee dryer 12. Specifically, in a part of the papermaking process shown in Figure 6, a belt press section 10, positioned between the dewatering roll 11 and the Yankee dryer 12, can be used to create a textured surface. The belt press section 10 presses the wet paper 14 together with the textured belt 13 (the textured belt 13 loops between the belt press section 10 and the Yankee dryer 12), thereby creating a textured pattern on the wet paper 14.

[0042] (Processing method, packaging form) After that, the wet tissue 1 (a laminate of sheets 2) is packaged with the packaging body 3. The side dimensions of the sheet 2 produced by the above manufacturing method are preferably 80 mm to 300 mm, and more preferably 120 mm to 220 mm. In addition, the above papermaking process may involve making the paper in a wide width (e.g., 1000 mm) and then cutting it into 10 sheets (e.g., 100 mm wide) in a processing machine.

[0043] As described above, according to this embodiment, even if paper is used for the sheet impregnated with the chemical solution and it is folded into six or more layers and laminated, it is possible to provide a wet tissue that is excellent in texture and compactness, and is also tear-resistant. [Examples]

[0044] The present invention will be described in more detail below with reference to examples, but the present invention is not limited in any way by the following examples.

[0045] Wet tissues for Examples 1-15 and Comparative Examples 1-7 were prepared under the conditions shown in Tables 1-3, and the following evaluations were performed. Other parameters were evaluated according to the standards or measurement methods described above. Furthermore, in each example and comparative example in Tables 1-3, the six-fold method for the sheets was always Z-fold + half-fold, and the 30-sheet stacked wet tissues were packaged in a label-covered flexible packaging with a roughly rectangular opening of 45mm x 20mm.

[0046] 1. Ease of removal Thirty monitors evaluated the ease of removing wet wipes (sheets) from their packaging on a four-point scale. The evaluation was as follows: ◎ for reliably removing one sheet, ○ for removing one sheet a reasonable percentage of the time, △ for occasionally removing two or more sheets stuck together, and × for frequently removing two or more sheets stuck together. The evaluation that was most frequently chosen by the 30 monitors was used as the final rating.

[0047] 2. Resistance to tearing of the sheet Thirty monitors evaluated the tear resistance of wet wipes (sheets) after taking one sheet out of the packaging and wiping away dirt, using a four-point scale. The evaluation was as follows: ◎ for very tear-resistant, ○ for somewhat tear-resistant, △ for slightly tear-resistant, and × for very tear-resistant. The evaluation with the most frequent selection by the 30 monitors was used as the final rating.

[0048] 3. Compactness Thirty monitors evaluated the compactness of wet wipes (sheets) in their stacked and packaged state on a four-point scale. The evaluation was based on the following criteria: ◎ for particularly excellent compactness in use, ○ for excellent, △ for slightly bulky, and × for bulky. The final evaluation was the one most frequently selected by the 30 monitors.

[0049] 4. Texture Thirty monitors evaluated the texture of wet wipes (sheets) on a four-point scale. The evaluation was as follows: ◎ for excellent texture, ○ for reasonably good texture, △ for slightly inferior texture, and × for poor texture. The rating chosen most frequently by all 30 monitors was used as the final rating.

[0050] Tables 1 and 2 show the conditions and evaluation results for each example, and Table 3 shows the conditions and evaluation results for each comparative example. [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] Based on the above, it was confirmed that even when paper is used for the sheet impregnated with the chemical solution and it is folded into six or more layers and laminated, a wet tissue can be obtained that is excellent in texture and compactness, and is also tear-resistant. [Explanation of Symbols]

[0054] 1 Wet wipes 2 sheets 3 Packaging 4. Removal holes 10 Belt press section 11 Dehydration Roll 12 Yankee Hair Dryer 13. Uneven belt 14 Wet paper

Claims

1. A wet tissue made by impregnating a paper sheet containing at least pulp fibers with a chemical solution, and then stacking it in a state where it is folded into six or more layers, When the aforementioned sheet was compressed using a KES compression tester, the WC (work of compression) was 0.15 gf·cm / cm. ２ More than 0.65gf・cm / cm ２ The following: A wet tissue characterized in that the sheet has a tensile strength of 2.2 N / 25 mm or more and 3.8 N / 25 mm or less when wet.

2. When a load of 50 gf / cm is applied to the sheet by a KES compression tester, the thickness of the sheet is T ２ , and when a load of 0.5 gf / cm is applied to the sheet, the thickness of the sheet is T ｍ , when (T ２ - T ０ ) / T ０ is 0.40 or more, the wet tissue according to claim 1 is characterized in that ｍ is 0.40 or more, the wet tissue according to claim 1 is characterized in that ０ is 0.40 or more, the wet tissue according to claim 1 is characterized in that

3. The aforementioned sheet was subjected to a compression test using a KES compression tester, resulting in a pressure of 50 gf / cm². ２ The thickness T of the sheet when the load is applied. ｍ The wet tissue according to claim 1, characterized in that its thickness is 160 μm or more and 440 μm or less.

4. The sheet has a pattern of irregularities on its surface originating from the paper machine. The wet tissue according to claim 1, characterized in that the combined height of the recessed and convex portions in the aforementioned uneven surface is 100 μm or more and 300 μm or less.

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