Cleaning sheet

Abstract

To provide a cleaning sheet that enables cleaning for achieving both wiping off of dirt and collection of dust to be achieved.SOLUTION: There is provided a cleaning sheet 100 in which a base paper sheet 1 is impregnated with a chemical solution. A hydrophobic fiber layer 11 consisting substantially of a hydrophobic fiber is provided on one surface side of the base paper sheet 1, and a hydrophilic fiber layer containing at least a hydrophilic fiber is provided on the other surface side of the base paper sheet 1. The hydrophilic fiber layer on the other surface side of the base paper sheet 1 is impregnated with more chemical solution than in the hydrophobic fiber layer 11 on the one surface side of the base paper sheet 1 in an unevenly distributed manner. By selectively using the front and the back of the cleaning sheet 100, cleaning to wipe off dirt on a floor surface on the hydrophilic fiber layer side of the cleaning sheet 100 is appropriately performed, and cleaning to collect dust on a floor surface on the hydrophobic fiber layer 11 side of the cleaning sheet 100 is appropriately performed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cleaning sheet. [Background technology]

[0002] 2. Description of the Related Art Conventionally, wet cleaning sheets have been known in which the sheet is impregnated with a chemical solution containing a cleaning component to improve wiping performance against dirt on a surface to be cleaned (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-180176 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when cleaning floors using a wet cleaning sheet such as the wet cleaning sheet of Patent Document 1, although it can effectively wipe away food stains and sebum stains stuck to the floor surface, it may not be able to capture all fine debris such as hair, fiber debris, and dust. As described above, wet-type cleaning sheets have been inferior to dry-type cleaning sheets in terms of their ability to capture fine dust, but there is still a demand for a cleaning method that combines wiping off dirt and capturing dust.

[0005] An object of the present invention is to provide a cleaning sheet that enables cleaning by simultaneously wiping off dirt and collecting dust. [Means for solving the problem]

[0006] In order to solve the above problems, the invention described in claim 1 is: A cleaning sheet in which a base paper sheet is impregnated with a chemical solution, The chemical solution is impregnated into one surface of the base-paper sheet so as to be more concentrated on the other surface than on the other surface of the base-paper sheet.

[0007] The invention described in claim 2 is the cleaning sheet described in claim 1, The base paper sheet is characterized in that a hydrophobic fiber layer consisting of almost hydrophobic fibers is provided on one side of the base paper sheet, and a hydrophilic fiber layer containing at least hydrophilic fibers is provided on the other side of the base paper sheet.

[0008] The invention described in claim 3 is the cleaning sheet described in claim 1 or 2, The base paper sheet is characterized in that one side and the other side are configured so as to be visually distinguishable from each other.

[0009] The invention described in claim 4 is the cleaning sheet described in claim 3, The base paper sheet is characterized in that one side and the other side have different colors.

[0010] The invention described in claim 5 is the cleaning sheet described in claim 3, The base paper sheet is characterized in that at least one of its one surface and the other surface is printed. Effect of the Invention

[0011] According to the present invention, a cleaning sheet is obtained that enables cleaning by simultaneously wiping off dirt and collecting dust. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a plan view showing the cleaning sheet of the present embodiment. [Diagram 2] FIG. 1 is a schematic cross-sectional view of a cleaning sheet according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a perspective view showing a cleaning tool to which a cleaning sheet according to an embodiment of the present invention is attached. [Figure 4]FIG. 13 is an explanatory diagram of a modified example of the cleaning sheet, in which one side (a) and the other side (b) are different colors. [Diagram 5] FIG. 13 is an explanatory diagram of a modified example of the cleaning sheet, in which one side (a) and the other side (b) are printed differently. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a cleaning sheet 100 according to an embodiment of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to the illustrated examples, and is determined solely based on the description of the claims. In the following description, the front / rear, left / right, top / bottom, X direction, Y direction, and Z direction are defined as shown in FIG. In addition, in this specification, the symbol "to" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0014] [1 Configuration Description] First, the configuration of the cleaning sheet 100 will be described.

[0015] As shown in FIG. 1, the cleaning sheet 100 is a rectangular base paper sheet 1 impregnated with a chemical solution. The cleaning sheet 100 of this embodiment is impregnated with the chemical solution so that it is unevenly distributed more on one side of the base-paper sheet 1 than on the other side. For example, as shown in FIG. 2, a hydrophobic fiber layer 11 made up of mostly hydrophobic fibers is provided on one side of the base-paper sheet 1, and a hydrophilic fiber layer 12 containing at least hydrophilic fibers is provided on the other side of the base-paper sheet 1. That is, hydrophobic fibers are concentrated on one surface of the base-paper sheet 1, while hydrophilic fibers are concentrated on the other surface of the base-paper sheet 1. The hydrophilic fiber layer 12 is impregnated with the chemical solution so that the chemical solution is unevenly distributed in a larger amount than the hydrophobic fiber layer 11 . The base paper sheet 1 refers to the state of the cleaning sheet 100 before it is impregnated with the chemical solution.

[0016] [(1) Base paper sheet] The base-paper sheet 1 is a nonwoven fabric produced by bonding predetermined fibers together by a well-known technique such as spunlace, air-through, air-laid, point bond, spunbond, needle punch, etc. A nonwoven fabric produced using the spunlace method is particularly preferred.

[0017] Specifically, the base paper sheet 1 can be, for example, a two-layer structure consisting of a hydrophobic fiber layer 11 and a hydrophilic fiber layer 12, formed by overlapping a sheet-like web of hydrophobic fibers with a sheet-like web containing at least hydrophilic fibers and entangling the fibers at the boundary region of the webs. For example, the base paper sheet 1 having a two-layer structure of a hydrophobic fiber layer 11 and a hydrophilic fiber layer 12 can be manufactured by bonding webs together through hydroentangling using the spunlace method. In addition, since the base-paper sheet 1 is formed by intertwining a web of hydrophobic fibers with a web containing hydrophilic fibers, the hydrophobic fiber layer 11 may contain a small amount of hydrophilic fibers, but the proportion is extremely small, so it can be said that the hydrophobic fiber layer 11 is mainly composed of hydrophobic fibers.

[0018] [a Hydrophilic fiber] As hydrophilic fibers, natural fibers such as cotton, pulp, and hemp, and regenerated fibers such as rayon and cupra can be used, but from the viewpoint of maintaining water retention, it is preferable to use pulp, rayon, polypropylene spunbond fiber (PPSB), etc.

[0019] [b Hydrophobic fiber] Examples of hydrophobic fibers include polyolefin fibers such as polyethylene (PE), polypropylene (PP), and polyvinyl alcohol; polyester fibers such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); and acrylic fibers. These may be used alone or in combination of two or more. Examples of composite fibers of two or more types include binder fibers of a core-sheath type in which a resin with a relatively low melting point (low melting point resin) is used as the sheath and a resin with a relatively high melting point (high melting point resin) is used as the core, and a side-back type in which a low melting point resin and a high melting point resin are arranged in parallel in a predetermined direction.

[0020] [c Weight] The basis weight of the base paper sheet 1 is 40 to 100 g / m2 from the viewpoint of achieving both the dirt retention ability and the flexibility of the sheet. 2 (gsm) is preferred. Specifically, the basis weight of the hydrophobic fiber layer 11 of the base paper sheet 1 is 20 to 50 g / m 2 (gsm), and the basis weight of the hydrophilic fiber layer 12 of the base paper sheet 1 is 20 to 50 g / m 2 (gsm) is preferred. The basis weight refers to the basis weight measured in accordance with JIS P8124:2011.

[0021] [d-CNF] Cellulose nanofibers (CNF) can be added to the base paper sheet. CNF refers to fine cellulose fibers obtained by defibrating pulp fibers, and generally refers to cellulose fibers containing cellulose fine fibers with a fiber width of nano size (1 nm to 1000 nm), but the average fiber width is preferably 100 nm or less. The average fiber width can be calculated, for example, by using a certain number of number averages, medians, mode diameters (mode values), etc.

[0022] The CNF may be uniformly impregnated in the thickness direction of the base-paper sheet, but it is preferable that the CNF content gradually increases from the center in the thickness direction of the base-paper sheet toward the front and back surfaces, because this makes the cleaning sheet 100 less likely to tear even if the cleaning surface is strongly rubbed.

[0023] [(a) Pulp fibers that can be used for CNF] Pulp fibers that can be used to manufacture CNF include chemical pulps such as hardwood pulp (LBKP) and softwood pulp (NBKP); mechanical pulps such as bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), pressed stone ground pulp (PGW), refiner ground pulp (RGP), chemi-ground pulp (CGP), thermo-ground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), and refiner mechanical pulp (RMP); waste paper pulp produced from brown paper, kraft envelope paper, magazine paper, newspaper paper, flyer paper, office paper, cardboard paper, white waste paper, Kent waste paper, imitation waste paper, land certificate waste paper, and recycled paper; and deinked pulp (DIP) produced by deinking waste paper pulp. These may be used alone or in combination as long as the effects of the present invention are not impaired.

[0024] [(b) CNF defibration method] Examples of defibration methods used in the production of CNF include mechanical methods such as the high-pressure homogenizer method, the microfluidizer method, the grinder grinding method, the bead mill freeze-grinding method, and the ultrasonic defibration method, but are not limited to these methods. In addition, CNF that has only been mechanically treated (not modified) using the above-mentioned defibration methods, i.e., CNF that has not been modified with functional groups, has higher thermal stability than CNF modified with functional groups such as phosphate groups and carboxymethyl groups, and can be used for a wider range of applications. However, CNF modified with functional groups such as phosphate groups and carboxymethyl groups can also be used in the present invention. In addition, for example, pulp fibers that have been mechanically defibrated may be subjected to chemical treatment such as carboxymethylation or enzyme treatment. Examples of CNF that have been chemically treated include iCNF (individualized CNF) (single nanocellulose) with a diameter of 3 nm to 4 nm, such as TEMPO-oxidized CNF, phosphate-esterified CNF, and phosphite-esterified CNF. In addition, CNF that has been subjected to only chemical or enzymatic treatment, or CNF that has been subjected to chemical or enzymatic treatment and then mechanical fiberization treatment may be used.

[0025] [e Emboss] As shown in FIG. 1, the base paper sheet 1 has embossments 20, which are areas where the sheet is compressed in the thickness direction and has unevenness formed therein, in order to improve the cleaning performance of the sheet against dirt and debris on the surface to be cleaned.

[0026] The embossments 20 include convex embossments 21 that are convex toward one side of the sheet and concave embossments 22 that are convex toward the other side of the sheet (concave toward the one side), and these are arranged alternately. Moreover, both the convex embossments 21 and the concave embossments 22 are formed in a generally elliptical shape with a constricted portion in the approximate center in the major axis direction, that is, in a so-called gourd shape, when the base-paper sheet 1 is viewed from above.

[0027] The arrangement and shape of the embossments are preferably as described above from the viewpoint of sufficiently improving the cleaning performance on both sides of the cleaning sheet 100, but are not limited thereto and may be modified as appropriate. Although not preferred, it is also possible to use a flat base paper sheet that does not have embossments.

[0028] [(2) Chemical solution] The chemical solution impregnated into the base-paper sheet 1 as described above is weakly alkaline with a hydrogen ion exponent (pH) of 8.0 to 9.0, and contains 0.01% to 0.25% by mass of polyoxyalkylene alkyl ether and 0.00% to 5.00% by mass of ethanol.

[0029] In this embodiment, it is sufficient that the hydrophilic fiber layer 12 of the base-paper sheet 1 is impregnated with the chemical solution. That is, the hydrophilic fiber layer 12 of the base-paper sheet 1 is in a wet state impregnated with the chemical solution. For example, it is preferable that the hydrophilic fiber layer 12 of the base paper sheet 1 is impregnated with a chemical solution in an amount of 280% to 340% by mass based on the mass of the base paper sheet 1 when it is dry. On the other hand, the hydrophobic fiber layer 11 of the base paper sheet 1 may be in a semi-dry (semi-wet) state where the chemical solution has slightly penetrated, or in a dry state where the chemical solution is hardly impregnated. The hydrophobic fiber layer 11 of the present embodiment is assumed to be in a semi-dry (semi-wet) state. For example, it is assumed that the hydrophobic fiber layer 11 of the base paper sheet 1 is impregnated with a chemical solution in an amount of about 0% to 200% by mass based on the mass of the base paper sheet 1 when it is dry.

[0030] Note that it is preferable to use fibers having a coarser fineness for the hydrophobic fiber layer 11 than the fibers used for the hydrophilic fiber layer 12. For example, the fibers used for the hydrophobic fiber layer 11 desirably have a fineness of about 6.6 to 7.8 dtex. By doing so, the hydrophobic fiber layer 11 is more likely to maintain a relatively dry state than the hydrophilic fiber layer 12.

[0031] Here, a method of impregnating the chemical solution so that it is more unevenly distributed on the other surface side (hydrophilic fiber layer 12 side) of the base paper sheet 1 than on one surface side (hydrophobic fiber layer 11 side) will be described.

[0032] For example, the base paper sheet 1 having a two-layer structure of the hydrophobic fiber layer 11 and the hydrophilic fiber layer 12 is folded so that the hydrophobic fiber layer 11 is on the outer surface side and the hydrophilic fiber layer 12 is on the inner surface side, and the chemical solution is applied to the hydrophobic fiber layer 11 side which is on the outer surface side. The chemical solution applied to the hydrophobic fiber layer 11 side easily penetrates from the hydrophobic fiber layer 11 into the hydrophilic fiber layer 12, and most of the chemical solution moves to the hydrophilic fiber layer 12 side, so that the hydrophilic fiber layer 12 side of the base paper sheet 1 is impregnated with a large amount of the chemical solution (the first chemical solution impregnation method). At this time, the hydrophobic fiber layer 11 of the base paper sheet 1 is in a semi-dry (semi-wet) state where the chemical solution has slightly penetrated.

[0033] In addition, the base paper sheet 1 having a two-layer structure of a hydrophobic fiber layer 11 and a hydrophilic fiber layer 12 is folded so that the hydrophilic fiber layer 12 is on the outer side and the hydrophobic fiber layer 11 is on the inner side, and a chemical solution is applied to the hydrophilic fiber layer 12 side on the outer side. The chemical solution applied to the hydrophilic fiber layer 12 side hardly transfers to the hydrophobic fiber layer 11 side, so that the hydrophilic fiber layer 12 side of the base-paper sheet 1 is impregnated with a large amount of the chemical solution (second chemical solution impregnation method). At this time, the hydrophobic fiber layer 11 of the base-paper sheet 1 is in a dry state, being hardly impregnated with the chemical solution.

[0034] In addition, since the chemical solution can transfer from the hydrophilic fiber layer 12 to the hydrophobic fiber layer 11, by using the cleaning sheet 100 while pressing it strongly in the thickness direction, a certain amount of the chemical solution can be transferred from the hydrophilic fiber layer 12 to the hydrophobic fiber layer 11, and the hydrophobic fiber layer 11 can be used in a slightly more moist state than when it was unused.

[0035] (3) Condition when in use As shown in FIG. 3, the cleaning sheet 100 is a sheet used for cleaning floors by being replaceably attached to a cleaning tool 200 having, for example, a rectangular, flat head portion 201 and a handle portion 202 attached to the upper surface of the head portion 201.

[0036] As shown in FIG. 1, the cleaning sheet 100 has a rectangular shape and covers the bottom surface of the head portion 201 of the cleaning tool 200 to form a cleaning surface, and is folded at a fold line S along the longitudinal edge portion 201a of the head portion 201 of the cleaning tool 200 to be engaged with the upper surface of the head portion 201, thereby being attached to the cleaning tool 200. The long edges 201a refer to edges along the long direction of the head portion 201. In other words, they refer to the two longer edges of the four edges of the rectangular head portion 201.

[0037] [2. Description of Effects] According to the cleaning sheet 100 of this embodiment, the hydrophilic fiber layer 12, which is impregnated with the chemical solution, and the hydrophobic fiber layer 11, which is not so impregnated with the chemical solution, can be selectively used to clean the floor surface. Specifically, by attaching the cleaning sheet 100 to the head portion 201 of the cleaning tool 200 so that the hydrophilic fiber layer 12 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor surface, the cleaning sheet 100 can be used as a wet-type cleaning sheet, making it possible to effectively wipe away food stains, sebum stains, and the like that have stuck to the floor surface. Furthermore, if the cleaning sheet 100 is attached to the head part 201 of the cleaning tool 200 so that the hydrophobic fiber layer 11 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor surface, the cleaning sheet 100 can be used as a semi-dry type cleaning sheet, making it possible to perform cleaning by collecting fine debris such as hair, fiber waste, and dust.

[0038] In other words, by using the front and back sides of the cleaning sheet 100 in different ways, cleaning can be performed that achieves both wiping off dirt and collecting dust. For example, after cleaning to collect dirt using the hydrophobic fiber layer 11 side of the cleaning sheet 100 as the cleaning surface, the cleaning sheet 100 attached to the head unit 201 can be turned over and the hydrophilic fiber layer 12 side of the cleaning sheet 100 can be used as the cleaning surface to wipe off dirt from the floor surface. In this way, by using the front and back sides of a single cleaning sheet 100, cleaning can be performed that achieves both wiping off dirt and collecting dust. EXAMPLES

[0039] Next, the results of evaluation of the examples of the present invention will be described. The present invention will be specifically described below with reference to examples, but the present invention is not limited to these.

[0040] <Sample Creation> The base paper sheet 1 of the cleaning sheet 100 used in the following tests was manufactured to have a hydrophobic fiber layer 11 having a fiber blend of PET / PET-PET binder=80 / 20 and a basis weight equivalent to 24 gsm as a nonwoven fabric, and a hydrophilic fiber layer 12 having a fiber blend of rayon / PET=80 / 20 and a basis weight equivalent to 36 gsm as a nonwoven fabric. The hydrophilic fiber layer 12 of this cleaning sheet 100 was impregnated with a chemical solution containing 0.25 mass % polyoxyalkylene alkyl ether and 2.00 mass % ethanol by the above-mentioned first chemical solution impregnation method so that the impregnation rate was 300%. The surface of the cleaning sheet 100 on the hydrophobic fiber layer 11 side (semi-dry surface) thus prepared was designated as Example 1, and the surface on the hydrophilic fiber layer 12 side (wet surface) was designated as Example 2, and the following dust collection test and dirt wiping test were performed. In addition, a similar test was conducted using a dry sheet product marketed by our company as Comparative Example 1 and a wet sheet product marketed by our company as Comparative Example 2. That is, four cleaning sheet samples, Example 1, Example 2, Comparative Example 1, and Comparative Example 2, were prepared and subjected to the following tests. The wet sheet of Comparative Example 2 had a chemical solution impregnation rate of 300%.

[0041] <Gas collection test> A 25 cm x 100 cm frame was placed on top of a plywood wooden flooring material, and several strands of hair were placed within the frame. Here, five strands of hair were arranged along the longitudinal direction of the frame, and five strands were arranged in a direction approximately perpendicular to the longitudinal direction. The hairs used were approximately 10 cm long. A sample of the cleaning sheet was placed at one end of the longitudinal direction within the frame, and the sample was rubbed back and forth longitudinally within the frame once against the top surface of the wooden flooring, and the number of hairs that the sample had captured was counted. Here, a sample of the cleaning sheet was attached to the head part of a cleaning tool (floor wiper), and a 500 g weight was attached to the head part. The longitudinal edge of the head part was oriented approximately perpendicular to the longitudinal direction of the frame, and the sample was moved back and forth once within the frame. The sheet of Example 1 is attached to the head portion so that the surface on the hydrophobic fiber layer 11 side (semi-dry surface) is rubbed against the wooden flooring material, and the sheet of Example 2 is attached to the head portion so that the surface on the hydrophilic fiber layer 12 side (wet surface) is rubbed against the wooden flooring material. This dust collection test was carried out five times for each sample, and the dust collection performance of each sample was compared.

[0042] As a result of this dust collection test, it was confirmed that the sample of Example 1 (semi-dry surface) and the sample of Comparative Example 1 (dry sheet) were able to effectively collect hair on wooden flooring materials. The samples of Example 1 and Comparative Example 1 had the same dust collection performance. It was also confirmed that the sample of Example 2 (wet surface) was inferior to the samples of Example 1 and Comparative Example 1 in dust collection performance. Also, it was confirmed that the sample of Comparative Example 2 (wet sheet) had the poorest dirt collection performance among the four samples.

[0043] <Stain wiping test> 0.5 cc of cafe au lait (Mild Cafe Au Lait, manufactured by Ezaki Glico Co., Ltd.) was dropped onto two points in the center of a 320 mm long polypropylene plate, and the plate was dried at 60° C. for 1 hour to adjust the amount of adhering dirt. A sample of the cleaning sheet is placed on the right end of the polypropylene plate, and a rubber plate is placed on top of the sample. Here, four polypropylene plates with cafe au lait stains were prepared, and the stain on the first polypropylene plate was set to be wiped off with the sheet of Example 1 (semi-dry side), the stain on the second polypropylene plate was set to be wiped off with the sheet of Example 2 (wet side), the stain on the third polypropylene plate was set to be wiped off with the sheet of Comparison Example 1, and the stain on the fourth polypropylene plate was set to be wiped off with the sheet of Comparison Example 2. The cleaning sheet sample with the rubber plate placed on it is then moved to the left end of the polypropylene plate over a period of about 4 seconds, and then moved from the left end to the right end of the polypropylene plate over a period of about 4 seconds. This reciprocation was repeated several times, and the state of contamination was observed after each reciprocation.

[0044] As a result of this stain wiping test, it was confirmed that the sample of Example 2 (wet surface) and the sample of Comparative Example 2 (wet sheet) quickly removed stains adhering to the polypropylene plate. The samples of Example 2 and Comparative Example 2 had the same stain wiping performance. It was also confirmed that the sample of Example 1 (semi-dry surface) was inferior to the samples of Example 2 and Comparative Example 2 in terms of dirt wiping performance. Moreover, the sample (dry sheet) of Comparative Example 1 was hardly able to remove the stains adhering to the polypropylene plate.

[0045] <Test Results> From the results of the dirt collection test and the dirt wiping test described above, it was confirmed that the surface of the cleaning sheet 100 of this embodiment facing the hydrophobic fiber layer 11 (semi-dry surface) has good dirt collection performance, and the surface of the cleaning sheet 100 of this embodiment facing the hydrophilic fiber layer 12 (wet surface) has good dirt wiping performance. In other words, with the cleaning sheet 100 of this embodiment, one side (the side on the hydrophobic fiber layer 11 side) and the other side (the side on the hydrophilic fiber layer 12 side) of a single cleaning sheet 100 can be used separately to perform cleaning that simultaneously wipes away dirt and collects dust.

[0046] The present invention is not limited to the above-described embodiment. For example, as shown in Figs. 4(a) and (b), it is preferable that one side of the base-paper sheet 1, which is the hydrophobic fiber layer 11 side, and the other side of the base-paper sheet 1, which is the hydrophilic fiber layer 12 side, are configured to be visually distinguishable from each other. Here, the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 and the surface of the hydrophilic fiber layer 12 are made different colors from each other, making it possible to visually distinguish one side of the cleaning sheet 100 (base-paper sheet 1) from the other side. For example, by making the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 uncolored white and the surface of the base-paper sheet 1 facing the hydrophilic fiber layer 12 light blue, the user can easily distinguish between the surface of the hydrophobic fiber layer 11 in a semi-dry state where it is only slightly impregnated with the chemical solution and the surface of the hydrophilic fiber layer 12 in a wet state where it is impregnated with the chemical solution. In this way, by making it possible to distinguish one side from the other side of the cleaning sheet 100 (base paper sheet 1), the cleaning sheet 100 can be appropriately attached to the head portion 201 of the cleaning tool 200 depending on whether it is for wiping off dirt stuck to the floor surface or for collecting fine debris that has fallen on the floor surface.

[0047] The embodiment is not limited to the embodiment in which the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 is uncolored and the surface of the base-paper sheet 1 facing the hydrophilic fiber layer 12 is colored, and the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 may be colored and the surface of the base-paper sheet 1 facing the hydrophilic fiber layer 12 may be uncolored. In addition, the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 and the surface of the base-paper sheet 1 facing the hydrophilic fiber layer 12 may be colored in different colors. Even in such an embodiment, the surface on the hydrophobic fiber layer 11 side and the surface on the hydrophilic fiber layer 12 side can be distinguished.

[0048] In addition, as shown in Figs. 5(a) and 5(b), it is preferable that one side of the base-paper sheet 1, which is the side of the hydrophobic fiber layer 11, and the other side of the base-paper sheet 1, which is the side of the hydrophilic fiber layer 12, are configured to be visually distinguishable from each other. Here, at least one of the surfaces of the base-paper sheet 1 facing the hydrophobic fiber layer 11 and the hydrophilic fiber layer 12 is printed to make it possible to visually distinguish one side from the other side of the cleaning sheet 100 (base-paper sheet 1). For example, by printing "DRY" on the surface of the base-paper sheet 1 facing the hydrophobic fiber layer 11 and printing "WET" on the surface of the base-paper sheet 1 facing the hydrophilic fiber layer 12, the user can easily distinguish between the surface of the hydrophobic fiber layer 11, which is in a semi-dry state where the drug solution is only slightly impregnated, and the surface of the hydrophilic fiber layer 12, which is in a wet state where the drug solution is impregnated. In this way, by making it possible to distinguish one side from the other side of the cleaning sheet 100 (base paper sheet 1), the cleaning sheet 100 can be appropriately attached to the head portion 201 of the cleaning tool 200 depending on whether it is for wiping off dirt stuck to the floor surface or for collecting fine debris that has fallen on the floor surface.

[0049] It is not limited to printing on both sides of the base-paper sheet 1, such as printing "DRY" on the side of the base-paper sheet 1 facing the hydrophobic fiber layer 11 and printing "WET" on the side of the base-paper sheet 1 facing the hydrophilic fiber layer 12. It is also possible to print "DRY" only on the side of the base-paper sheet 1 facing the hydrophobic fiber layer 11, or to print "WET" only on the side of the base-paper sheet 1 facing the hydrophilic fiber layer 12. Even in such an embodiment, the surface on the hydrophobic fiber layer 11 side and the surface on the hydrophilic fiber layer 12 side can be distinguished.

[0050] As described above, the cleaning sheet 100 of this embodiment can perform cleaning that combines wiping off dirt and collecting debris by using one side (the side on the hydrophobic fiber layer 11 side) and the other side (the side on the hydrophilic fiber layer 12 side) of a single cleaning sheet 100.

[0051] In the above embodiment, the cleaning sheet 100 is attached to the cleaning tool 200 for cleaning, but the present invention is not limited to this. It is also possible to wipe and clean with the cleaning sheet 100 held in the hand without using the cleaning tool 200.

[0052] In addition, other specific details of the structure can of course be modified as appropriate. [Explanation of symbols]

[0053] 1 Base sheet 11 Hydrophobic fiber layer 12 Hydrophilic fiber layer 20 Embossing 21 Convex embossing 22 Concave embossing S fold line 100 Cleaning Sheets 200 Cleaning equipment 201 Head 202 Handle

Claims

1. A cleaning sheet in which a base paper sheet is impregnated with a chemical solution, The cleaning sheet is characterized in that the chemical solution is impregnated into one surface of the base-paper sheet so as to be more concentrated on the other surface of the base-paper sheet than on the other surface of the base-paper sheet.

2. 2. The cleaning sheet according to claim 1, wherein a hydrophobic fiber layer made of substantially hydrophobic fibers is provided on one surface of the base-paper sheet, and a hydrophilic fiber layer containing at least hydrophilic fibers is provided on the other surface of the base-paper sheet.

3. 3. The cleaning sheet according to claim 1, wherein one side and the other side of the base-paper sheet are configured so as to be visually distinguishable from each other.

4. 4. The cleaning sheet according to claim 3, wherein one surface and the other surface of the base paper sheet have different colors.

5. 4. The cleaning sheet according to claim 3, wherein at least one of one surface and the other surface of the base paper sheet is printed.

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