Wet wipe

Abstract

To provide wet wipes which have an excellent take-out property, an excellent anti-drying out property, and an excellent wiping property when paper is used for a sheet impregnated with a medicinal solution.SOLUTION: In wet wipes, a paper sheet which is folded by being impregnated with a medicinal solution and includes at least a pulp fiber is packaged in a packaging bag made of a film with a take-out port. Basis weight of the sheet in an absolute dry state is 20 g / m2 or more and 50 g / m2 or less. Concentration of ethanol contained in a squeezed solution is 20 wt.% or more and 70 wt.% or less in squeezing the medicinal solution out of the sheet. An area of the take-out port is 1000 mm2 or more and 5000 mm2 or less. A volatilization rate of the medicinal solution is 80% or less in a lapse of 10 minutes after taking out the sheet from the packaging bag.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to wet tissues in which a paper sheet is impregnated with a medicinal liquid. [Background technology]

[0002] Wet tissue products are generally produced by impregnating a sheet of nonwoven fabric or paper with a chemical solution.

[0003] The sheet impregnated with the drug solution is folded and then packaged in a film provided with an opening through which the user can remove the sheet for wiping or the like.

[0004] For example, Patent Document 1, which is a document on wet tissues using paper as a base material, describes a paper-based wet tissue with a basis weight of 10 to 30 g / m 2 The document discloses a wiping sheet made of an embossed laminated sheet containing 5 to 40 parts by weight of polyols per 100 parts by weight of a laminate of multiple wet pulp sheets. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-332777 Summary of the Invention [Problem to be solved by the invention]

[0006] However, if the sheet is made of paper, the water in the chemical solution will seep into the spaces between the fibers of the sheet, reducing its strength, which can cause problems such as the sheet breaking due to resistance to the removal opening when the sheet is removed. On the other hand, if the amount of the chemical solution impregnated is reduced, the decrease in the strength of the sheet can be suppressed, but then the moisture content becomes insufficient, and the wiping ability of the sheet decreases.

[0007] Furthermore, if the opening is made larger to reduce resistance when the sheets are removed, the sheets will be more likely to dry out after opening. In addition, when the number of sheets remaining becomes small, the sheets may not come out continuously (drop back). Increasing the alcohol concentration in the chemical solution can help prevent the strength of the sheet from decreasing, but because alcohol is easily volatile, there is the problem that the sheet dries out during use or storage, reducing its wiping ability.

[0008] When paper is used as the wet tissue sheet in this way and the product is packaged in a film packaging bag, it has been difficult to produce wet tissue that is easy to take out and wipe off and that is also difficult to dry.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to provide a wet tissue that has good removability, does not dry easily, and has good wiping properties, even when a paper sheet is used for the sheet impregnated with the chemical solution. [Means for solving the problem]

[0010] The inventors conducted extensive research and found that in wet tissues prepared by packaging a folded paper sheet containing at least pulp fibers impregnated with a chemical solution in a film packaging bag equipped with an opening, by setting the basis weight of the sheet in an absolute dry state, the ethanol concentration in the squeezed liquid, the area of ​​the opening, and the evaporation rate of the chemical solution from the sheet 10 minutes after it is removed from the packaging bag within respective predetermined numerical ranges, even when paper is used as the sheet impregnated with the chemical solution, the wet tissues have good take-out properties, are not prone to drying, and have good wiping properties, leading to the completion of the present invention. That is, the present invention provides the following.

[0011] (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 folded, and packaged in a film packaging bag having an opening, and the sheet has a basis weight of 20 g / m2 in an absolute dry state. 2 More than 50g / m 2When the liquid medicine is squeezed out from the sheet, the concentration of ethanol contained in the squeezed liquid is 20% by weight or more and 70% by weight or less, and the area of ​​the outlet is 1000 mm 2 More than 5000mm 2 The wet tissue is characterized in that the volatilization rate of the medicinal solution from the sheet is 80% or less 10 minutes after the sheet is removed from the packaging bag.

[0012] (2) A second aspect of the present invention is the wet tissue described in (1), characterized in that the ratio of the widthwise dimension of the dispensing opening to the clip width of the sheet is 25% or more and 65% or less.

[0013] (3) A third aspect of the present invention is the wet tissue described in (1), characterized in that the amount of the chemical solution transferred to the sheet when a load is applied 10 minutes after the sheet is removed from the packaging bag is 0.05 g or more.

[0014] (4) A fourth aspect of the present invention is the wet tissue according to (1), characterized in that the impregnation rate of the liquid medicine in the sheet is 2 times or more and 4 times or less.

[0015] (5) A fifth aspect of the present invention is the wet tissue according to (1), characterized in that the sheet has a longitudinal tensile strength of 500 gf / 25 mm or more and 1200 gf / 25 mm or less when wet, and a lateral tensile strength of 280 gf / 25 mm or more and 600 gf / 25 mm or less when wet. Effect of the Invention

[0016] According to the present invention, even when paper is used for the sheet impregnated with the liquid medicine, wet tissues having good removability, resistance to drying, and wiping properties can be provided. [Brief description of the drawings]

[0017] [Figure 1]1 is a perspective view of a wet tissue according to an embodiment of the present invention; [Diagram 2] This is an XY plane image of the height profile (mapping) of the sheet using a microscope. [Diagram 3] This is an image of the profile of the height of the irregularities ((measured) cross-sectional curve S) along the line segment S1-S2 in FIG. 2(b). [Figure 4] 4 is an image of a roughness curve W obtained by processing the (measured) profile curve S in FIG. 3. [Diagram 5] FIG. 5 is a diagram showing how to determine the height of the irregularities of the sheet from FIG. 4 that originate from the paper machine. [Figure 6] FIG. 2 is a schematic diagram of a location where unevenness derived from a papermaking machine is imparted during the papermaking process of a sheet. [Figure 7] FIG. 2 is a perspective view of a stack of sheets packaged in a packaging bag. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment for carrying out the present invention (hereinafter, simply referred to as "the present embodiment") will be described in detail. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist. In addition, the MD direction of the wet tissue is the machine direction in which the sheet is conveyed during production, and the CD direction is the cross direction perpendicular to the machine direction.

[0019] <Wet tissue> 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 medicinal solution, folded, and packaged in a film packaging bag 3 having a take-out opening 4. Since the sheet 2 is made of paper and does not contain synthetic fibers, it is highly biodegradable and can be used as an economical wet tissue 1. The sheet 2 is preferably one-ply or two-ply, and more preferably one-ply.

[0020] Furthermore, the method of folding sheet 2 is not particularly limited as long as it is a folding method normally used for wet tissues, wet wipes, etc., and examples include a mountain fold on one side of the short side of sheet 2 so as to divide it into approximately four equal parts and a valley fold on the other side (Z fold), and then a mountain fold or valley fold on the long side so as to divide it into approximately two equal parts (half fold), a six-fold fold, etc.

[0021] Fig. 1 is a perspective view of a wet tissue 1 according to this embodiment. As shown in Fig. 1, the wet tissue 1 is produced by packaging a folded sheet 2 impregnated with a medicinal solution in a film packaging bag 3 having a take-out opening 4. The material of the film used for the packaging bag 3 is not particularly limited, but from the viewpoint of compactness, it is preferable that the packaging bag 3 be made of a flexible, water-impermeable packaging film as shown in FIG.

[0022] The area of ​​the outlet 4 is 1000 mm 2 More than 5000mm 2 The area is 1000 mm or less. 2 If the area is less than 5000 mm, the resistance to removal increases and the sheet 2 becomes easily torn. 2 If the amount exceeds this, Sheet 2 may dry out easily after opening, or Sheet 2 may not come out continuously. To calculate the area of ​​the outlet 4, first calculate the basis weight (g / m 2 A piece of paper or film with a known surface area is cut out so as to have an area equal to that of the outlet 4, and its weight (g) is measured. Next, the weight (g) divided by the basis weight (g / m 2 ) x 1000 2 Therefore, the area (mm 2 The above process is repeated five times, and the average result is taken as the measured value. Note that the lower limit of the area of ​​the outlet 4 is 1500 mm2 It is preferable that the thickness is 2000 mm or more. 2 More preferably, the upper limit is 4000 mm. 2 It is preferable that the length is less than 3500 mm. 2 It is more preferable that:

[0023] (Sheet) The pulp fibers used in the sheet 2 according to this embodiment may be general pulp fibers (wood pulp) such as bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP). Among them, it is preferable to include bleached softwood kraft pulp (NBKP) and bleached hardwood kraft pulp (LBKP). The NBKP content in the pulp fibers is preferably 40% or more and 80% or less, more preferably 45% or more and 75% or less, and even more preferably 50% or more and 70% or less. When the NBKP content is within the above numerical range, the strength and water retention of the sheet 2 can be improved. As the NBKP, for example, fibers made of radiata pine, slash pine, southern pine, lodgepole pine, spruce and Douglas fir are preferable. Note that, instead of NBKP, NUKP and instead of LBKP, LUKP can be used.

[0024] The liquid medicine to be impregnated into the sheet 2 may contain alcohol (ethanol), moisturizers, preservatives, antibacterial agents, stabilizers, etc., which are normally used in wet tissues, but it is preferable that the liquid medicine contains polyhydric alcohols such as PG (propylene glycol), DPG (dipropylene glycol), and BG (butylene glycol). By containing these polyhydric alcohols, it is easy to adjust the volatilization rate of the liquid medicine and the transfer amount of the liquid medicine under a certain load, which will be described later. However, the amount of polyhydric alcohols contained in the liquid medicine is limited to a maximum of 5% by weight.

[0025] At this time, it is preferable that the impregnation ratio of the medicinal solution into the sheet 2 is 2 to 4 times. If the impregnation ratio is less than 2 times, the wettability is insufficient, and the wet tissue 1 has poor wiping properties, and if it exceeds 4 times, the strength of the sheet 2 decreases and it becomes easy to break. By having the impregnation ratio within the above numerical range, the wiping properties and removal properties of the sheet 2 can be optimized.

[0026] The method of measuring the impregnation ratio is to first measure the area and weight of the wet tissue 1 (sheet 2 impregnated with the drug solution), then wash the wet tissue 1 with an alcohol solution and completely dry it. After completely drying, the humidity is conditioned in an environment of 23°C and 50% RH, and the weight of the sheet 2 is measured. The weight of the drug solution impregnated per gram of paper is then regarded as the impregnation ratio. The lower limit of the impregnation ratio is more preferably 2.3 times or more, and even more preferably 2.5 times or more, and the upper limit is more preferably 3.5 times or less, and even more preferably 3.2 times or less.

[0027] Furthermore, when the medicinal liquid is squeezed out from the sheet 2, the concentration of ethanol contained in the squeezed liquid is 20% by weight or more and 70% by weight or less. If the concentration of ethanol is less than 20% by weight, the strength of the sheet 2 is insufficient and the sheet 2 is easily torn. If the concentration of ethanol exceeds 70% by weight, the sheet 2 is easily dried out and the wiping properties are reduced. The ethanol concentration of the squeezed liquid is measured using the liquid obtained by squeezing the sheet 2 impregnated with the drug solution. The ethanol concentration can be measured by a known method (for example, the alcohol number measurement method of the Japanese Pharmacopoeia: Method 2 gas chromatography, etc.). The lower limit of the ethanol concentration in the squeezed juice is preferably 30% by weight or more, more preferably 40% by weight or more, and the upper limit is preferably 60% by weight or less, more preferably 50% by weight or less.

[0028] Furthermore, the volatilization rate of the medicinal solution from the sheet 2 is 80% or less 10 minutes after it is removed from the packaging bag 3. If the volatilization rate exceeds 80%, the sheet 2 dries up during use, resulting in poor wiping properties. The method for measuring the volatility rate of the drug solution is as follows: first, after opening the packaging bag 3, the sheet 2 is taken out, and the weight (g) of the sheet 2 immediately after taking it out is measured (at this time, a balance capable of measuring to two decimal places is used). Next, the sheets 2 are spread out and left to stand on a desk so that they do not overlap. After that, the weight is measured after 10 minutes, and the weight (g) of the sheet 2 after 10 minutes is calculated. Then, the sheet is completely dried in a dryer at 40°C until the weight fluctuation is 0.01 g or less, and the weight (g) of the sheet 2 in the completely dried state is measured.

[0029] Finally, the weight of the sheet immediately after removal (g) - the weight of the sheet after drying (g) = the initial weight of the liquid chemical (g), the weight of the sheet after 10 minutes (g) - the weight of the sheet after drying (g) = the weight of the liquid chemical after 10 minutes (g), (1 - (weight of the liquid chemical after 10 minutes (g) ÷ initial weight of the liquid chemical (g))) x 100 = the liquid chemical volatilization rate (%), and the average of each sheet is measured. At this time, the sheets used for measurement are 10%, 25%, 50%, 75%, and 90% from the top of the number of sheets (for example, in the case of a pack of 100 sheets, the 10th, 25th, 50th, 75th, and 90th sheets are measured). If the number of sheets is less than 10, 5 sheets are measured at any point, and if the number is not divisible, it does not matter which is the front or back. The above tests are performed in an environment of 23°C and 50% RH. The volatilization rate of the chemical solution is preferably 75% or less, and more preferably 70% or less. The volatilization rate of the chemical solution can be adjusted by the impregnation ratio, the specific volume of the sheet 2, the average fiber length, the ethanol concentration in the chemical solution, the blending rate of polyhydric alcohol, etc.

[0030] It is preferable that the amount of chemical solution transferred to the sheet 2 when a load is applied is 0.05 g or more 10 minutes after it is removed from the packaging bag 3. If the amount transferred is less than 0.05 g, the chemical solution does not reach the object to be wiped, resulting in poor wiping properties. The method for measuring the amount of transferred liquid is as follows: first, after opening the packaging bag 3, the sheet 2 is taken out, and left to stand on a desk for 10 minutes in an unfolded state so that the sheets 2 do not overlap. Then, ten sheets of filter paper (ADVANTEC, circular qualitative filter paper No. 1) whose weight has been measured in advance are placed on top of the sheet, and then the sheet is subjected to a pressure of 35 gf / cm 2 After leaving it for 90 seconds, measure the amount of water absorbed by the filter paper and use this as the transfer amount. The above tests are carried out in an environment of 23°C and 50% RH. The amount of the transferred chemical solution is preferably 0.1 g or more, and more preferably 0.15 g or more. The amount of the transferred chemical solution can be adjusted by the impregnation ratio, the specific volume of the sheet 2, the blending of pulp fibers, the WC of the KES compression tester described later, and the like.

[0031] In order to facilitate optimization of the tensile strength of the sheet 2 when wet, which will be described later, it is preferable that the sheet 2 does not have water-decomposability. In addition, since the production is not limited to equipment such as an embossing roll, there is no decrease in sheet strength due to embossing, and the tensile strength, which will be described later, is easily optimized, it is preferable that the sheet 2 does not have unevenness on both sides due to embossing that is not derived from a papermaking machine, which will be described later.

[0032] Moreover, the sheet 2 according to the present embodiment has a paper machine-derived uneven pattern on the surface, which is different from embossing, and the combined height of the protrusions and recesses in the unevenness is preferably 100 μm to 300 μm. When the height of the unevenness is within the above numerical range, the water retention of the chemical solution becomes appropriate, and the evaporation rate of the above-mentioned chemical solution can be easily adjusted. The lower limit of the height of the combined height of the convex and concave portions is more preferably 130 μm or more, and even more preferably 150 μm. The upper limit is more preferably 270 μm or less, and even more preferably 250 μm or less. The unevenness caused by the papermaking machine can be adjusted by a general method such as crepe ratio or wet crepe.

[0033] The height of the unevenness of sheet 2 caused by the papermaking machine is measured using a microscope. As the microscope, a product name "One-shot 3D Measuring Microscope VR-3100" manufactured by KEYENCE Corporation can be used. As the observation, measurement, and image analysis software for the microscope image, a product name "VR-H1A" can be used. The measurement conditions are a measurement magnification of 12 times and a field of view area of ​​24 mm x 18 mm. The measurement magnification and field of view area may be changed as appropriate depending on the size of the unevenness desired. Note that while 3D measuring machines and contour shape measuring machines measure points and lines, in the case of one-shot 3D measurement, the entire surface is measured, making it easy to see the overall shape and waviness.

[0034] A specific method for measuring the height of unevenness caused by a paper machine will be described with reference to Figures 2 to 5. The measurement is performed on a sheet 2 (wet tissue 1) impregnated with a chemical solution. Figure 2(a) is an XY plane image of the height profile (mapping) taken by a microscope. The up-down direction in Figure 2 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), by drawing a line segment S1-S2 parallel to the vertical direction at any position on the XY plane image of the height profile (mapping), the unevenness height ((measured) cross-sectional curve S) profile shown in Figure 3 is obtained. Note that each unevenness extends in the vertical direction, and the line segment S1-S2 crosses these multiple unevennesses, so no matter where in the vertical direction on the XY plane image you draw the line segment S1-S2, the unevenness height profile remains almost unchanged.

[0035] Here, the height profile is a (measured) cross-sectional curve S that represents the actual unevenness of the surface of the sheet 2, but it also contains noise (steep peaks due to fiber clumps, whisker-like fibers, and fiber-free areas on the surface of the sheet 2.) Therefore, when calculating the height of the unevenness, it is necessary to remove such noise peaks. Therefore, the (measured) cross-sectional curve S in Figure 3 is smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the roughness curve W in Figure 4. Note that smoothing using the filter of the weighted average radio button can be obtained automatically if the above-mentioned analysis software is used.

[0036] For the obtained roughness curve W, the difference in the vertical axis between a convex portion and an adjacent concave portion is measured at 10 locations (H1 to H10) as shown in Figure 5, and the average is taken as the height of the unevenness (Rc). In addition, three line segments S1-S2 are set for one height profile image, and three roughness curves W as shown in Figure 4 are obtained. Rc is then calculated for each of these three roughness curves W. Three images of the sample are prepared, and the height of the unevenness is calculated by averaging a total of nine data points (Rc), and this is used.

[0037] (Sheet properties) The basis weight of the sheet 2 according to this embodiment in an absolute dry state is 20 g / m 2 More than 50g / m 2 The basis weight is 20 g / m 2 If the sheet 2 has a basis weight of less than 50 g / m, the sheet 2 will not have sufficient strength and will be easily torn when taken out. 2 If the thickness exceeds this value, Sheet 2 becomes stiff and the wiping properties become poor. The basis weight of the sheet 2 in an oven-dry state is measured in accordance with JIS P 8124. The lower limit of the basis weight of the sheet 2 in an oven-dry state is 25 g / m 2 It is preferable that the thickness is 30 g / m or more. 2 More preferably, the upper limit is 45 g / m 2 It is preferable that the thickness is less than 40 g / m 2 It is more preferable that:

[0038] In addition, the sheet 2 according to this embodiment preferably has a longitudinal tensile strength of 500 gf / 25 mm or more and 1200 gf / 25 mm or less when wet, and preferably has a transverse tensile strength of 280 gf / 25 mm or more and 600 gf / 25 mm or less when wet. If the longitudinal tensile strength is less than 500 gf / 25 mm or the transverse tensile strength is less than 280 gf / 25 mm, the strength of the sheet 2 is insufficient and the sheet 2 is easily torn when taken out. If the longitudinal tensile strength exceeds 1200 gf / 25 mm or the transverse tensile strength exceeds 600 gf / 25 mm, the sheet 2 has a poor usability. The lower limit of the tensile strength in the machine direction of the sheet 2 when wet is more preferably 550 gf / 25 mm or more, and even more preferably 600 gf / 25 mm or more, and the upper limit is more preferably 1100 gf / 25 mm or less, and even more preferably 900 gf / 25 mm or less. Furthermore, the lower limit of the tensile strength in the lateral direction of the sheet 2 when wet is more preferably 290 gf / 25 mm or more, and even more preferably 300 gf / 25 mm or more, and the upper limit is more preferably 570 gf / 25 mm or less, and even more preferably 550 gf / 25 mm or less.

[0039] The tensile strength when wet is measured by pulling out one sheet 2 from the stacked wet tissues 1, cutting it to a width of 25 mm, and measuring it with a tensile tester at a gripping width of 100 mm and a stretching speed of 300±5 mm / min, and taking the average value of 10 measurements. The above measurements are performed in both the machine and cross directions, and the tensile strength in each direction is calculated. In this case, the longitudinal direction of the sheet 2 is the direction parallel to the MD direction, and the lateral direction of the sheet 2 is the direction parallel to the CD direction.

[0040] The wet tensile strength of the sheet 2 can be adjusted by a common method such as adding a dry strength agent or a wet strength agent in the papermaking process or beating. Similarly, the longitudinal and transverse directions (MD and CD) of the sheet 2 can be adjusted by fiber orientation. It is also preferable that the tensile strength in the removal direction of the sheet 2 is higher than the tensile strength in the other direction. High strength in the removal direction makes the sheet 2 less likely to tear.

[0041] When sheet 2 was compressed using a KES compression tester, the WC (compression work) was 0.15 gf cm / cm 2 More than 0.65gf cm / cm 2 When WC is within the above range, the thickness of the sheet 2 becomes appropriate, and the above-mentioned tensile strength can be easily adjusted. The lower limit of WC (compression work) is 0.25 gf cm / cm 2 It is preferable that the value is equal to or greater than 0.35 gf cm / cm 2 More preferably, the upper limit is 0.55 gf cm / cm 2 It is preferable that the value is less than 0.50gf cm / cm 2 It is more preferable that the WC (compression work) is equal to or less than 10 ...

[0042] The WC is measured using a KES-G5 automated compression tester (manufactured by Kato Tech Co., Ltd.). 2cm 2 A sample of wet tissue 1 (sheet 2 impregnated with a chemical solution) cut 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 pressure change and thickness of the sample at that time are measured, and WC is calculated from these values. The average of 10 measurements is calculated as the final WC.

[0043] (Wet tissue manufacturing method) The wet tissue 1 according to this embodiment can be manufactured by the same process as that for ordinary wet tissue products. Specifically, the wet tissue 1 (laminate 20 of sheets 2 shown in FIG. 7) can be obtained by the processes of (1) papermaking and creping, (2) cutting, and (3) folding, lamination, and chemical impregnation. The timing of the chemical impregnation may be either before or after lamination, or lamination and impregnation may be performed simultaneously. In this case, the number of stacked sheets 2 (for each packaging bag 3 described later) is not particularly limited, but is preferably 50 sheets or more and 120 sheets or less.

[0044] In the papermaking process, as described above, it is preferable that a papermaking machine-derived uneven pattern is applied to the sheet 2. By having this uneven pattern, it is easy to optimize the WC of the sheet 2. Here, "originating from the papermaking machine" means that the uneven pattern is applied between the head box of the papermaking machine and the inlet of the Yankee dryer 12 in the papermaking process of the sheet 2. Specifically, in a part of the papermaking process shown in Fig. 6, unevenness can be imparted in a belt press section 10 arranged between a dewatering roll 11 and a Yankee dryer 12. In the belt press section 10, a wet paper 14 and an uneven belt 13 (the uneven belt 13 loops between the belt press section 10 and the Yankee dryer 12) are pressed together, thereby imparting an uneven pattern to the wet paper 14.

[0045] (Processing method, packaging form) Thereafter, the wet tissue 1 (the laminate 20 of the sheets 2) is packaged in a packaging bag 3. The sheet 2 produced by the above-mentioned manufacturing method has a side dimension of preferably 80 mm to 300 mm, more preferably 120 mm to 220 mm. In the above-mentioned papermaking process, the sheet is made in a wide width (e.g., 1000 mm) and then cut into 10 pieces (e.g., 100 mm wide) in a processing machine.

[0046] In the laminate 20 in Fig. 7 and the packaging bag 3 in Fig. 1, the ratio of the width dimension of the removal opening 4 to the clip width CW of the sheet 2 is preferably 25% or more and 65% or less. If the ratio is less than 25%, the sheet 2 is likely to tear when removing it. If the ratio exceeds 65%, the sheet 2 is likely to dry out after opening, or the sheet 2 may not come out continuously. The clip width CW is measured at two points on the top and bottom surfaces of the laminate 20, and the average is taken as the measured value. The widthwise dimension of the outlet 4 is measured at the longest point of the outlet 4. A JIS-compliant metal ruler is used for each measurement. The lower limit of the ratio is more preferably 30% or more, and even more preferably 40% or more. The upper limit is more preferably 60% or less, and even more preferably 55% or less.

[0047] As described above, according to this embodiment, even if paper is used for the sheet impregnated with the liquid medicine, it is possible to provide wet tissues that have good removability, resistance to drying, and wiping properties. EXAMPLES

[0048] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples in any way.

[0049] Wet tissues of Examples 1 to 17 and Comparative Examples 1 to 8 were produced under the conditions shown in Tables 1 to 3, and the following evaluations were carried out. Note that each parameter other than the following evaluations was measured according to the standards or measurement methods described above. In each of the Examples and Comparative Examples in Tables 1 to 3, the sheets were folded in a Z-shape, and 80 sheets of the wet tissues were stacked and packaged in a labeled soft packaging bag with a roughly rectangular opening. The drug solution was a mixture of ethanol, PG, and water in predetermined amounts.

[0050] 1. The seat is tear-resistant Thirty test subjects took one wet tissue (sheet) from the packaging and used it to wipe off dirt, then rated the sheet's tear resistance on a four-point scale. The ratings were as follows: ◎ for very tear-resistant, ○ for moderately tear-resistant, △ for slightly tearable, and × for very tearable, with the rating most frequently chosen by the 30 test subjects being the final rating.

[0051] 2. Sheets are difficult to dry Thirty test subjects rated how difficult it was for the wet tissues to dry after using one pack until it was completely used up, on a four-point scale. The test subjects were given a rating of ◎ if the wetness was mostly maintained, ○ if the wetness was maintained to a certain extent, △ if the wetness was slightly dried out, and × if the wetness was almost completely dried out. The rating most frequently chosen by the 30 test subjects was regarded as the final rating.

[0052] 3.Easy to wipe off Thirty monitors took one wet tissue (sheet) from the packaging and used it to wipe off dirt, then rated the ease of wiping with the sheet on a four-point scale. The ratings were as follows: ◎ for extremely excellent wiping ability, ○ for excellent wiping ability, △ for slightly poor wiping ability, and × for poor wiping ability. The rating most frequently chosen by the 30 monitors was recorded as the final rating.

[0053] 4. Difficulty in dropping back Thirty test subjects removed all the wet tissues (sheets) from the packaging, then took out 80 wet tissues (sheets) one by one in succession and rated the difficulty of them dropping back on a four-point scale. The ratings were as follows: ◎ for no drop back at all, ○ for almost no drop back, △ for some drop back, and × for frequent drop back, with the rating most frequently chosen by the 30 subjects being the final rating.

[0054] Tables 1 and 2 show the conditions and evaluation results of each example, and Table 3 shows the conditions and evaluation results of each comparative example. [Table 1]

[0055] [Table 2]

[0056] [Table 3]

[0057] From the above, it was confirmed that even if paper is used as the sheet impregnated with the drug solution, wet tissues having good removability, resistance to drying, and wiping properties can be obtained. [Explanation of symbols]

[0058] 1 wet tissue 2 seats 3 packaging bag 4. Removal port 10 Belt press section 11 Dewatering roll 12 Yankee Dryer 13 Concave and Convex Belt 14 Wet Paper 20 Laminate

Claims

1. A wet tissue comprising a folded paper sheet containing at least pulp fibers impregnated with a chemical solution and packaged in a film packaging bag having an opening for dispensing the wet tissue, The sheet has a basis weight of 20 g / m2 in an oven-dry state. ２ 50g / m or more ２ is as follows: When the drug solution is squeezed out from the sheet, the concentration of ethanol contained in the squeezed liquid is 20% by weight or more and 70% by weight or less; The area of ​​the outlet is 1000 mm ２ More than 5000mm ２ is as follows: The wet tissue is characterized in that the volatilization rate of the liquid medicine from the sheet is 80% or less 10 minutes after the sheet is removed from the packaging bag.

2. 2. The wet tissue according to claim 1, wherein a ratio of a width direction dimension of the take-out opening to a clip width of the sheet is 25% or more and 65% or less.

3. 2. The wet tissue according to claim 1, wherein the amount of the chemical solution transferred to the sheet when a load is applied 10 minutes after the sheet is removed from the packaging bag is 0.05 g or more.

4. 2. The wet tissue according to claim 1, wherein the sheet has an impregnation rate of the chemical solution of 2 to 4 times.

5. The sheet has a longitudinal tensile strength in a wet state of 500 gf / 25 mm or more and 1200 gf / 25 mm or less, 2. The wet tissue according to claim 1, wherein the sheet has a tensile strength in the lateral direction when wet of 280 gf / 25 mm or more and 600 gf / 25 mm or less.

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