Cleaning wet wipes

Abstract

To provide a cleaning wet sheet capable of reducing occurrence of wiping streaks when performing wiping cleaning by attaching the sheet to a cleaning tool having a head part.SOLUTION: A cleaning wet sheet 100 includes a plurality of first projected embosses 211 and a plurality of second projected embosses 212 which are projected on a first surface and to be projected embosses 21 in different long axis directions. The first projected embosses 211 adjacent in a short axis direction orthogonal to the long axis direction are arranged to be partially overlapped in the short axis direction and also to be deviated in the long axis direction. The second embosses 212 adjacent in the short axis direction are arranged to be partially overlapped in the short axis direction and also to be deviated in the long axis direction. The plurality of first projected embosses 211 and second projected embosses 212 are continuously arranged from a first side of the cleaning wet sheet 100 to a second side (b) opposing to the first side (a).SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] It has been known that embossing the cleaning surface of a wet cleaning sheet with convex portions improves the ease of wiping off dirt, operability, and visibility of dirt on the sheet (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-064723 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in wet cleaning sheets such as those shown in Patent Document 1, the projections on the paper are aligned in a straight line (for example, in the direction of the long axis), which can result in areas on the surface to be cleaned that have not been wiped by the projections (so-called "wiping streaks"). When users see the wiping streaks, they may decide that the chemical solution has run out and the sheet has dried out, even though there is still chemical solution remaining in the sheet, and discard the sheet, which can result in using many sheets unnecessarily.

[0005] An object of the present invention is to provide a wet cleaning sheet that can reduce the occurrence of wiping streaks when attached to a cleaning tool having a head portion and used for wiping. [Means for solving the problem]

[0006] The invention described in claim 1 is a wet cleaning wipe made of a base paper sheet impregnated with a chemical solution, which is attached to a cleaning tool having a head portion and used, The wet cleaning sheet has a convex embossment on the first surface, and a concave embossment on the second surface, Multiple parallel axial lines The convex embossment; Multiple parallel axial lines a plurality of embossed blocks each formed in combination with the recessed embossments are continuously arranged from a first side of the wet cleaning sheet to a second side opposite to the first side to form an embossed block row; a plurality of the embossed block rows are arranged continuously from a third side perpendicular to the first side to a fourth side opposite to the third side, and adjacent first embossed block rows and second embossed block rows are arranged with a shift in a direction from the first side toward the second side, The convex embossings and the concave embossings in a first embossing block are arranged so that their major axis direction is different from that of the convex embossings and the concave embossings in an adjacent second embossing block, and that they partially overlap with the convex embossings and the concave embossings adjacent to the second embossing block in the minor axis direction perpendicular to the major axis direction.

[0007] The invention described in claim 2 is the wet cleaning sheet described in claim 1, The convex embossings and the concave embossings in the first embossing block and the convex embossings and the concave embossings in the second embossing block are arranged so that the major axis directions are oriented at approximately right angles to each other.

[0008] The invention described in claim 3 is the wet cleaning sheet according to claim 1 or 2, The embossed blocks are characterized by being diamond-shaped.

[0009] The invention described in claim 4 is the wet cleaning sheet according to any one of claims 1 to 3, The embossment is elliptical in shape and has a constricted portion at approximately the center in the major axis direction. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a wet cleaning sheet that can reduce the occurrence of wiping streaks when attached to a cleaning tool having a head portion and used for wiping. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a state in which the wet cleaning sheet of the present embodiment is in use. [Figure 2] 1 is a plan view showing a wet cleaning sheet according to an embodiment of the present invention; [Figure 3A] FIG. 10 is a diagram showing an embossed block of a wet cleaning sheet according to a modified example. [Figure 3B] FIG. 10 is a plan view showing a wet cleaning sheet according to a modified example. [Figure 4A] FIG. 10 is a diagram showing an embossed block of a wet cleaning sheet according to a modified example. [Figure 4B] FIG. 10 is a plan view showing a wet cleaning sheet according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a wet cleaning sheet 100 according to an embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated example, and is determined solely based on the description of the claims. In the following description, the X direction, Y direction, and Z direction are defined as shown in FIG.

[0013] [Configuration of the embodiment] FIG. 1 is a diagram showing a state in which a wet cleaning sheet 100 according to this embodiment is in use. As shown in FIG. 1, the cleaning wet sheet 100 is a sheet made by plying (laminated) multiple base paper sheets, which is 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 and is used for cleaning floors. The cleaning wet sheet 100 covers the bottom surface of the head part 201 of the cleaning tool 200 to form a cleaning surface, and is folded along the longitudinal edge 201a of the head part 201 of the cleaning tool 200 and engaged with the upper surface of the head part 201 to be attached. The long edges 201a refer to edges along the longitudinal 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.

[0014] The base paper sheet is not particularly limited as long as it is a fiber assembly, and may be made of, for example, single-layer or multi-layer paper, nonwoven fabric, or synthetic fiber-blended paper, etc. When the base paper sheet is made of nonwoven fabric, it is produced by bonding predetermined fibers together using well-known techniques such as spunlace, air-through, air-laid, point bond, spun bond, or needle punch.

[0015] The predetermined fibers may be natural, regenerated, or synthetic, and examples thereof include hydrophilic cellulosic fibers such as rayon, lyocell, Tencel, and cotton, hydrophobic polyolefin fibers such as polyethylene, polypropylene, and polyvinyl alcohol, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, and polyamide fibers such as nylon. These may be used alone or in combination of at least one hydrophilic and one hydrophobic fiber.

[0016] The fibers preferably have a fineness of 1.1 dtex to 5.5 dtex. If the fineness is less than 1.1 dtex, the pores between the fibers are small, which is not suitable for capturing fiber debris and hair. If the fineness is more than 5.5 dtex, the retained chemical solution tends to be released, which is not suitable. The fiber length of these fibers may be any length suitable for manufacturing.

[0017] Furthermore, when the base paper sheet is made of paper, examples of the pulp used as the raw material include bleached hardwood kraft pulp (LBKP), bleached softwood kraft pulp (NBKP), unbleached hardwood kraft pulp (LUKP), unbleached softwood kraft pulp (NUKP), hardwood sulfite pulp, and softwood sulfite pulp, and a suitable blend of these in any appropriate ratio is suitable.

[0018] More preferably, the blending ratio of hardwood bleached kraft pulp exceeds 50% by weight, that is, the blending ratio of softwood bleached kraft pulp to hardwood bleached kraft pulp is less than 1: 1. By increasing the blending ratio of hardwood bleached kraft pulp to softwood bleached kraft pulp, the inter-fiber gaps are reduced and moisture evaporation is suppressed, thereby improving the resistance to drying. It may also be made of crushed pulp or crushed pulp covered with or sandwiched between water-disintegrable paper.

[0019] (Count) In the case of the wet cleaning sheet 100 of the present invention, the basis weight is 20 to 100 g / m 2 , especially 30-60g / m 2 The weight of the sheet is preferably about 20 g / m 2 If it is less than 100g / m, the sheet will not be able to retain dirt well, and will tend to become unstable during cleaning. 2 If the thickness exceeds this, the flexibility will be poor, making it difficult to attach the wet cleaning sheet 100 to the cleaning tool 200.

[0020] [Water-soluble binder] In addition, a water-soluble binder is added to the base paper sheet to increase the paper strength. Examples of water-soluble binders include carboxymethyl cellulose (CMC), polyvinyl alcohol, starch or its derivatives, hydroxypropyl cellulose, sodium alginate, tolanthus gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, pulpuran, polyethylene oxide, viscose, polyvinyl ethyl ether, sodium polyacrylate, sodium polymethacrylate, polyacrylamide, hydroxylated derivatives of polyacrylic acid, and polyvinylpyrrolidone / vinylpyrrolidone-vinyl acetate copolymer.

[0021] In particular, it is preferable to use a water-soluble binder having a carboxyl group, since it can exhibit wet strength through a crosslinking reaction. The water-soluble binder having a carboxyl group is an anionic water-soluble binder that easily generates a carboxylate in water. Examples of such binders include polysaccharide derivatives, synthetic polymers, and natural products.

[0022] (Polysaccharide derivative) Examples of polysaccharide derivatives include salts of CMC, carboxyethyl cellulose or its salts, and carboxymethylated starch or its salts, with alkali metal salts of CMC being particularly preferred.

[0023] (CMC) The degree of etherification of CMC is preferably 0.6 to 2.0, particularly 0.9 to 1.8, and more preferably 1.0 to 1.5, because this results in extremely good water-disintegrability and wet paper strength. It is also preferable to use a water-swellable CMC, because the CMC functions to bind the fibers that make up the base-paper sheet without swelling by crosslinking with aluminum ions, which are the crosslinking agent in the chemical solution in this embodiment, and this allows the wet cleaning sheet 100 to exhibit strength that can withstand cleaning and wiping tasks. In the case of the wet cleaning sheet 100 of this embodiment, CMC is added as the water-soluble binder.

[0024] The CMC may be uniformly impregnated in the thickness direction of the base-paper sheet, but it is preferable that the CMC content gradually increases from the center of the thickness direction of the base-paper sheet toward the front and back surfaces, because this makes the wet cleaning wipes 100 less likely to tear even when the surface to be cleaned is rubbed hard, compared to conventional products that are uniformly impregnated with the same amount of water-soluble binder.

[0025] (synthetic polymer) Examples of synthetic polymers include salts of polymers or copolymers of unsaturated carboxylic acids, and salts of copolymers of unsaturated carboxylic acids and monomers copolymerizable with the unsaturated carboxylic acids. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid. Examples of monomers copolymerizable with these include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid. Examples of the unsaturated carboxylic acid include esters of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, vinyl ether, etc. Particularly preferred synthetic polymers are those using acrylic acid or methacrylic acid as the unsaturated carboxylic acid, and specific examples include polyacrylic acid, polymethacrylic acid, salts of acrylic acid-methacrylic acid copolymers, and salts of copolymers of acrylic acid or methacrylic acid with alkyl acrylate or alkyl methacrylate. Natural products include sodium alginate, xanthan gum, gellan gum, taragaunt gum, and pectin.

[0026] (CNF) Furthermore, the wet cleaning sheet 100 may contain cellulose nanofiber (CNF). That is, CNF can be added to the water-soluble binder (CMC in this embodiment), and the specific surface area of ​​the base paper sheet becomes larger than that of a base paper sheet composed of only pulp.

[0027] Here, 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 or more and 1000 nm or less), but fibers with an average fiber width of 100 nm or less are preferred. The average fiber width can be calculated using, for example, a number average, median, or mode diameter (mode value) of a certain number of fibers.

[0028] 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 of the thickness direction of the base-paper sheet toward the front and back surfaces, because this makes the wet cleaning wipes 100 less likely to tear even when the surface to be cleaned is rubbed hard, compared to conventional products that are uniformly impregnated with the same amount of water-soluble binder.

[0029] (Pulp fibers that can be used for CNF) Pulp fibers that can be used to produce CNFs 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); recycled paper pulp produced from used brown paper, kraft envelope paper, magazine paper, newspaper paper, flyer paper, office paper, cardboard paper, white paper, Kent paper, imitation paper, landfill paper, and recycled paper; and deinked pulp (DIP) produced by deinking recycled paper pulp. These may be used alone or in combination as long as the effects of the present invention are not impaired.

[0030] (CNF defibrillation method) Examples of defibration methods used in the production of CNF include mechanical methods such as high-pressure homogenizer method, microfluidizer method, grinder grinding method, bead mill freeze-pulverization method, and ultrasonic defibration method, but are not limited to these methods. CNF that has only been mechanically treated (not modified) using the above-mentioned defibration method, 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 or carboxymethyl groups, and can therefore be used in a wider range of applications. However, CNF modified with functional groups such as phosphate groups or carboxymethyl groups can also be used in the present invention. Furthermore, for example, pulp fibers that have been mechanically defibrated may be subjected to chemical treatment such as carboxymethylation or enzyme treatment. Examples of chemically treated CNF include iCNF (individualized CNF) (single nanocellulose) with a diameter of 3 to 4 nm, such as TEMPO-oxidized CNF, phosphate-esterified CNF, and phosphite-esterified CNF. Alternatively, CNF that has been subjected to only chemical or enzymatic treatment, or CNF that has been subjected to chemical or enzymatic treatment and then mechanically defibrated may be used.

[0031] [Chemical solution] The wet cleaning sheet 100 of this embodiment is impregnated with a predetermined chemical solution containing an auxiliary such as glycol ethers, aqueous detergents, antiseptics, disinfectants, lower alcohols, organic solvents, etc. The chemical solution is impregnated in an amount of 100% by mass to 500% by mass, preferably 150% by mass to 300% by mass, based on the mass of the base paper sheet that is the substrate of the wet cleaning sheet 100. The chemical solution is impregnated into the base paper sheet that has been dried after the water-soluble binder has been applied, and the chemical solution impregnated into the hydrophilic fibers is released from the front or back surface when the cleaning wet sheet 100 is used.

[0032] [Cleaning wet sheets] FIG. 2 is a plan view showing an example of the wet cleaning sheet 100 of this embodiment. As shown in FIG. 2, the wet cleaning sheet 100 is generally rectangular and elongated in the X direction, and is formed, for example, to have a length of 250 mm to 300 mm, preferably 260 mm to 290 mm, in the X direction (longitudinal direction) and a length of 180 mm to 230 mm, preferably 200 mm to 210 mm, in the Y direction (transverse direction).

[0033] In the wet cleaning sheet 100, the portion that is folded along the longitudinal edge 201a of the head part 201 of the cleaning tool 200 is called a folding part S. The approximate positions of the folding portions S are set in advance to match the head portion 201 of the specified cleaning tool 200. That is, two rows of folding portions S extending in the X direction are set at predetermined positions in the Y direction of the wet cleaning sheet 100. Note that, to make the folding portions S recognizable to the user, for example, straight lines corresponding to the folding portions S may be printed on the wet cleaning sheet 100 in advance, or fold lines corresponding to the folding portions S may be formed on the wet cleaning sheet 100. The embossments 20 are arranged over substantially the entire surface of the wet cleaning sheet 100.

[0034] (Embossed) The embossments 20 are portions of the wet cleaning sheet 100 where the sheet is compressed in the Z direction. 2, the embossment 20 is formed in a so-called gourd shape, which is an oval shape that is short in one direction and narrow in width in a plan view, and has a constricted portion approximately in the center in the long axis direction. The shape of the embossment 20 is not limited to this and may be various shapes such as a polygon or a shape that combines various shapes, but from the viewpoint of improving the ability to scrape off dirt, such a gourd shape is preferable.

[0035] The embossments 20 can be formed by thermal embossing under conditions of, for example, a temperature of 80°C to 200°C and an embossing pressure of 0.2 MPa to 1.0 MPa. When the embossments 20 are formed by thermal embossing, the convex embossing roll has at least an outer circumferential surface made of carbon steel, stainless steel, polypropylene, ABS (Acrylonitrile Butadiene Styrene) resin, etc. Among them, from the viewpoint of durability and heat resistance, it is preferable to use a material made of stainless steel. Furthermore, when embossing is performed by thermal embossing, it is preferable to perform this before the step of impregnating the wet cleaning sheet 100 with a chemical solution, as this makes it easier to impart a concave-convex shape.

[0036] (Convex embossing, concave embossing) The embossments 20 include convex embossments 21 that are convex on the upper side in the Z direction (the first surface side of the wet cleaning sheet 100) and concave embossments 22 that are convex on the lower side (the second surface side of the wet cleaning sheet 100) (i.e., concave on the upper side in the Z direction). In Figures 1 to 4B, the convex embossments 21 are indicated by solid lines and the concave embossments 22 are indicated by dashed lines. The convex embossments 21 are formed to have a size of 5 mm to 10 mm, preferably 6 mm to 8 mm, in the long axis direction, 2 mm to 5 mm, preferably 3 mm to 4 mm, in the short axis direction perpendicular to the long axis direction, and 0.5 mm to 2 mm, preferably 0.7 mm to 1.5 mm, in the Z direction (height from an intermediate portion (described later)). The concave embossments 22 are formed upside down to the convex embossments 21 in cross section and in substantially the same shape, and are formed in a shape that is convex downward in the Z direction.

[0037] (middle part) Intermediate portions are formed between the embossments 20 formed on the wet cleaning sheet 100. Since the intermediate portions are areas where no embossments 20 are formed, they are positioned lower than the convex embossments 21 and higher than the concave embossments 22 in the Z direction.

[0038] [Embossing pattern] As shown in Fig. 2, the wet cleaning sheet 100 according to this embodiment has a plurality of first convex embossments 211 and second convex embossments 212 that are oriented in different major axis directions as the convex embossments 21. The first convex embossments 211 adjacent to each other in the minor axis direction are arranged so that both first convex embossments 211 partially overlap in the minor axis direction and are shifted in the major axis direction. The second convex embossments 212 adjacent to each other in the minor axis direction are arranged so that both second convex embossments 212 partially overlap in the minor axis direction and are shifted in the major axis direction. The plurality of first convex embossments 211 and second convex embossments 212 are arranged continuously from a first side a of the wet cleaning sheet 100 to a second side b opposite to the first side a.

[0039] Normally, the wet cleaning sheet 100 attached to the cleaning tool 200 having the head part 201 is moved approximately perpendicular to the X or Y direction when wiping, but in the case of the wet cleaning sheet 100 having the embossed pattern described above, the convex embossments 21 create an overlap that connects two opposing sides of the wet cleaning sheet 100 in the X or Y direction, thereby reducing the occurrence of wiping streaks when wiping.

[0040] In this case, it is particularly preferable that the first convex embossings 211 and the second convex embossings 212 are arranged so that a straight line at an angle of 45° with respect to the X direction passes through the center of each of the first convex embossings 211 and the second convex embossings 212 in the long axis direction and the short axis direction. It is also preferable that adjacent first convex embossings 211 and adjacent second convex embossings 212 overlap with each other by at least 0.1 mm in the short axis direction and are arranged so that the deviation in the long axis direction is within 5 mm (i.e., within the width of the long axis direction of the convex embossings 21). It is also preferable that the first convex embossings 211 and the second convex embossings 212 are arranged adjacent to each other so that their long axis directions form a substantially right angle, as shown in FIG.

[0041] With this embossing pattern, the protruding embossments 21 are always arranged within the range of a line drawn at an angle of 0° to 30° and within the range of a line drawn at an angle of 60° to 90° from one vertex of the wet cleaning sheet 100. Therefore, when the wet cleaning sheet 100 is moved within 30° from the X direction and the Y direction, i.e., in directions of 0° to 30°, 60° to 120°, 150° to 210°, 240° to 300°, and 330° to 360°, the protruding embossments 21 overlap with each other, thereby further reducing the occurrence of wiping streaks.

[0042] In such a wet cleaning sheet 100, the recessed embossments 22 are preferably formed by arranging first recessed embossments 221 and second recessed embossments 222 having different major axis directions in the same embossing pattern as the protruding embossments 21.

[0043] Specifically, the recessed embossments 22 include a first recessed embossment 221 and a second recessed embossment 222 that are oriented in different major axis directions. The second recessed embossments 222 adjacent to each other in the minor axis direction perpendicular to the major axis direction are arranged such that a portion of the second recessed embossments 222 overlaps with a portion of the second recessed embossments 222 in the minor axis direction and are shifted from each other in the major axis direction. The second recessed embossments 222 adjacent to each other in the minor axis direction are arranged such that a portion of the second recessed embossments 222 overlaps with a portion of the second recessed embossments 222 in the minor axis direction and are shifted from each other in the major axis direction. A plurality of such second protruding embossments 212 and second recessed embossments 222 are continuously arranged from a first side a of the wet cleaning sheet 100 to a second side b opposite to the first side a.

[0044] By arranging the concave embossings 22 in the same embossing pattern as the convex embossings 21, not only the first surface of the wet cleaning sheet 100 on which the convex embossings 21 are arranged, but also the second surface of the wet cleaning sheet 100 on which the concave embossings 22 on the first surface are convex upward in the Z direction, has cleaning ability equivalent to that of the first surface, thereby increasing the cleaning area per wet cleaning sheet 100.

[0045] [Variation 1] The embossed pattern on the wet cleaning sheet 100 is not limited to the above. For example, as shown in FIG. 3A, a plurality of approximately rectangular embossed blocks 30 each consisting of a combination of a convex embossment 21 and a concave embossment 22 are arranged along the X direction from a first side a of the wet cleaning sheet 100 to a second side b opposite the first side a, as shown in FIG. 3B, to form a plurality of embossed block rows 31, which are arranged consecutively along the Y direction from a third side c to a fourth side d.

[0046] In this case, for example, by arranging adjacent first embossed block rows 31 and second embossed block rows 31 so that they are offset in the X direction, the convex embossments 21 and concave embossments 22 in the first embossed block 30 are oriented in a different direction from the convex embossments 21 and concave embossments 22 in the adjacent second embossed block 30 in the long axis direction and are arranged so that they partially overlap the adjacent convex embossments 21 and concave embossments 22 in the short axis direction in the second embossed block 30. This creates overlapping margins between the multiple convex embossments 21 from the first side a to the second side b of the cleaning wet sheet 100 and from the third side c to the fourth side d, thereby reducing the occurrence of wiping streaks when the wet cleaning sheet 100 is attached to a cleaning tool 200 having a head portion 201 and used for wiping.

[0047] [Variation 2] Furthermore, the configuration of the embossing block 30 is not limited to the above. For example, in an embossing block 30 in which the convex embossments 21 and the concave embossments 22 are alternately arranged in the X direction and the Y direction, the major axis directions of the convex embossments 21 and the concave embossments 22 may be tilted within a range of 30° to 60° with respect to the X direction, thereby forming the embossing block 30 into a diamond shape, as shown in Fig. 4A.

[0048] As shown in Figure 4B, as in variant example 1, multiple embossed block rows 31 each consisting of embossed blocks 30 arranged continuously from the first side a to the second side b are arranged continuously from the third side c to the fourth side d, and when the convex embossments 21 and concave embossments 22 in the second embossing block 30 are arranged in a direction different from the long axis direction of the convex embossments 21 and concave embossments 22 in adjacent first embossing blocks 30 and so that they partially overlap in the short axis direction, the embossed blocks 30 are inevitably arranged so as to be misaligned from each other because they are diamond-shaped. Therefore, there is no need to intentionally arrange the first embossed block row 31 and the second embossed block row 31 so that they are misaligned.

[0049] (non-embossed part) As shown in FIG. 4B, between the embossed blocks 30, the wet cleaning sheet 100 may be provided with non-embossed portions 40 that are not compressed in the Z direction and have raised naps.

[0050] The non-embossed portion 40 can be formed by designing the convex embossing roll that forms the embossment 20 so as to exclude the shape of the non-embossed portion 40, or by compressing it lightly compared to the compressed portion of the embossment 20 so that the nap remains. By providing the non-embossed portion 40, when the wet cleaning sheet 100 is moved in a predetermined direction to clean, dirt tends to accumulate in the non-embossed portion 40, thereby improving the dirt collection performance.

[0051] However, as shown in Fig. 4B, if the non-embossed portions 40 are formed in a straight line, wiping streaks may easily occur depending on the angle at which the wet cleaning sheet 100 is moved. Therefore, it is preferable to dispose the first embossed block 30 at a position offset from the adjacent second embossed block 30 so that the non-embossed portions 40 do not form a straight line.

[0052] Also, in the embossing patterns of the above-mentioned modified examples 1 and 2, it is preferable that adjacent convex embossments 21 are arranged adjacent to each other so that their major axis directions form a substantially right angle.

[0053] Of course, other specific details of the structure can be changed as appropriate. For example, the chemical solution impregnated into the wet cleaning sheet 100 can be changed depending on the intended use. Furthermore, although the wet cleaning sheet 100 has been described as being made by plying (laminating) a plurality of base paper sheets, the present invention is not limited to this and may be made of a single layer. In addition, in Figures 2 and 4B, the first side a and the second side b are the long sides of the wet cleaning sheet 100, and in Figure 3B, the third side c and the fourth side d are the long sides, but this is not limited to this.

[0054] In addition, in Figs. 2 to 4B, the convex embossments 21 and the concave embossments 22 are both gourd-shaped, which are substantially the same shape in plan view, but the convex embossments 21 and the concave embossments 22 may have different shapes.

[0055] However, in any of the above embossing patterns, it is preferable that the convex embossments 21 and the concave embossments 22 arranged on the wet cleaning sheet 100 have approximately the same shape and number. This allows the first and second sides of the wet cleaning sheet 100 to have approximately the same cleaning function, and the cleaning area per wet cleaning sheet 100 can be increased. [Explanation of symbols]

[0056] 100 cleaning wipes 20 Embossing 21 Convex embossing 211 First Convex Emboss 212 Second convex embossing 22 concave embossing 221 First concave embossing 222 Second concave embossing 30 Embossed Block 31 Embossed Block Row a First side b second side c Third side d Fourth side

Claims

1. A wet cleaning sheet comprising a base paper sheet impregnated with a chemical solution, the wet cleaning sheet being attached to a cleaning tool having a head portion, The wet cleaning sheet has a convex embossment on the first surface thereof and a concave embossment on the second surface thereof, a plurality of embossed blocks each consisting of a combination of a plurality of the convex embossments having the same long axis direction and a plurality of the concave embossments having the same long axis direction are continuously arranged from a first side of the wet cleaning sheet to a second side opposite to the first side to form an embossed block row; a plurality of the embossed block rows are continuously arranged from a third side perpendicular to the first side to a fourth side opposite to the third side, and adjacent first embossed block rows and second embossed block rows are arranged with a shift in a direction from the first side toward the second side, The convex embossings and the concave embossings in a first embossing block have a different orientation in the long axis direction from the convex embossings and the concave embossings in an adjacent second embossing block, and are arranged so as to partially overlap with the convex embossings and the concave embossings adjacent in the second embossing block in the short axis direction perpendicular to the long axis direction.

2. 2. The wet cleaning sheet according to claim 1, wherein the convex embossments and the concave embossments in the first embossing block and the convex embossments and the concave embossments in the second embossing block are arranged so that the longitudinal direction is oriented at approximately right angles to each other.

3. 3. The wet cleaning sheet according to claim 1, wherein the embossed blocks are diamond-shaped.

4. 4. The wet cleaning sheet according to claim 1, wherein the embossment has an elliptical shape and has a constricted portion at approximately the center in the major axis direction.

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