Cleaning sheet

Abstract

This cleaning sheet 100 comprises a hydrophobic nonwoven fabric layer 11, a hydrophilic nonwoven fabric layer 12, and a waterproof layer 13 interposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12 and is used by being attached to a head part 201 of a cleaning tool 200, wherein the hydrophilic nonwoven fabric layer 12 is impregnated with a chemical solution. As a result, the front and back of the cleaning sheet 100 can be used for different purposes, where cleaning involving the wiping up of a stain on a floor can be appropriately performed by means of the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 and cleaning involving the collection of refuse on a floor can be appropriately performed by means of the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100.

Description

Cleaning Sheet

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

[0002] Conventionally, a wet cleaning sheet having a two-layer structure of a hydrophilic nonwoven fabric layer having a high chemical liquid impregnation rate and a hydrophobic nonwoven fabric layer having a low chemical liquid impregnation rate has been known (see, for example, Patent Document 1). When using this wet cleaning sheet, it is recommended to use the surface on the hydrophilic nonwoven fabric layer side as a dirt wiping surface and the surface on the hydrophobic nonwoven fabric layer side as a finish wiping surface.

[0003] Japanese Patent No. 6960719

[0004] By the way, when a floor surface is cleaned using a wet-type cleaning sheet such as the wet cleaning sheet disclosed in the above-mentioned Patent Document 1, even if spilled food stains, sebum stains and the like adhering firmly to the floor surface can be satisfactorily wiped off, fine dust such as hair, fiber scraps and dust may not be completely collected. As described above, wet-type cleaning sheets are sometimes inferior to dry-type cleaning sheets in performance of collecting fine dust, but there are not a few demands for cleaning that achieves both dirt wiping and dust collection.

[0005] An object of the present invention is to provide a cleaning sheet that enables cleaning that achieves both dirt wiping and dust collection.

[0006] To solve the above problems, the invention described in claim 1 is a cleaning sheet used attached to the head of a cleaning tool, comprising a hydrophobic nonwoven fabric layer, a hydrophilic nonwoven fabric layer, and a waterproof layer interposed between the hydrophobic nonwoven fabric layer and the hydrophilic nonwoven fabric layer, wherein the cleaning sheet has a cleaning surface portion arranged to cover the bottom surface of the head portion, and locking surfaces on both sides of the cleaning surface portion that are folded and locked to the upper surface of the head portion, wherein the cleaning surface portion is provided with a plurality of joint portions having a configuration in which the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer are partially attached, and the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer are joined by the joint portions, and the joint portions are configured as an aggregate of embossed portions formed by pressing the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer together. In this context, the hydrophobic nonwoven fabric layer is a dry-type nonwoven fabric layer that is not impregnated with the chemical solution, while the hydrophilic nonwoven fabric layer is a wet-type nonwoven fabric layer that is impregnated with the chemical solution.

[0007] The invention described in claim 2 is a cleaning sheet according to claim 1, characterized in that the embossed portion has a substantially oval shape in plan view, and at least one of the embossed portions constituting the joint portion is formed at an angle with respect to the vertical and horizontal directions of the cleaning sheet.

[0008] The invention described in claim 3 is characterized in that, in the cleaning sheet described in claim 2, the joint portion is composed of two to four embossed portions.

[0009] The invention described in claim 4 is characterized in that, in the cleaning sheet described in claim 1, the embossed portion provided on the cleaning surface occupies 8.4 to 12.8% of the cleaning surface.

[0010] The invention described in claim 5 is a cleaning sheet according to any one of claims 1 to 4, wherein the locking surface portion is provided with a plurality of slits extending in a direction substantially parallel to the fold line along the boundary line between the locking surface portion and the cleaning surface portion, and is configured such that at least a portion of the slits engages with the locking portion when the locking surface portion is locked to a locking portion provided on the upper surface of the head portion.

[0011] The invention described in claim 6 is characterized in that, in the cleaning sheet described in claim 5, the plurality of slits are arranged in a staggered pattern.

[0012] The invention described in claim 7 is a cleaning sheet according to claim 5, wherein the locking surface portion is provided with a plurality of embossed portions formed by pressing the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer together, and the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer are joined by the plurality of embossed portions.

[0013] According to the present invention, a cleaning sheet is obtained that enables cleaning while simultaneously wiping away dirt and collecting debris.

[0014] This is a plan view showing the cleaning sheet of this embodiment (Example 1). This is an explanatory diagram showing that the cleaning sheet of this embodiment has a three-layer structure. This is a schematic cross-sectional view of the cleaning sheet of this embodiment. This is a perspective view from below showing a cleaning tool to which the cleaning sheet of this embodiment is attached. This is a perspective view from above showing a cleaning tool to which the cleaning sheet of this embodiment is attached. This is a plan view showing the cleaning sheet of Example 2. This is a plan view showing the cleaning sheet of Example 3. This is a plan view showing the cleaning sheet of Example 4. This is a plan view showing the cleaning sheet of Comparative Example 1. This is a plan view showing the cleaning sheet of Comparative Example 2. This is a plan view showing the cleaning sheet of Comparative Example 3. This is a plan view showing the cleaning sheet of Comparative Example 4. This is a plan view showing the cleaning sheet of Embodiment 2 (Example 5). This is a perspective view from above showing a cleaning tool to which the cleaning sheet of Embodiment 2 is attached. This is a plan view showing the cleaning sheet of Embodiment 6. This is a plan view showing the cleaning sheet of Comparative Example 5. This is a plan view showing the cleaning sheet of Comparative Example 6. This is a plan view showing the cleaning sheet of Comparative Example 7. This is a plan view showing the cleaning sheet of Comparative Example 8. This is a plan view showing the cleaning sheet of Comparative Example 9.

[0015] Hereinafter, an embodiment of the present invention, the cleaning sheet 100, will be described with reference to the drawings. However, the technical scope of the present invention is not limited to the illustrated example and will be determined based on the description in the claims. In the following, the front / back, left / right, up / down, X direction, Y direction, and Z direction are defined as shown in Figures 4 and 5. In this specification, "~" is used to mean that the numerical values ​​described before and after it are included as the lower limit and upper limit.

[0016] [Description of the structure] First, the structure of the cleaning sheet 100 will be explained.

[0017] (Embodiment 1) [Cleaning Sheet] The cleaning sheet 100 of this embodiment, as shown in Figures 1 to 3, for example, comprises a hydrophobic nonwoven fabric layer 11 containing at least hydrophobic fibers, a hydrophilic nonwoven fabric layer 12 containing at least hydrophilic fibers, and a waterproof layer 13 interposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12. The sheet has a three-layer structure in which the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined together in a laminated state. The hydrophilic nonwoven fabric layer 12 of this cleaning sheet 100 is impregnated with a chemical solution. The waterproof layer 13 is disposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, which prevents the chemical solution impregnated in the hydrophilic nonwoven fabric layer 12 from seeping out to the hydrophobic nonwoven fabric layer 11.

[0018] [Condition during use] As shown in Figures 4 and 5, the cleaning sheet 100 is a sheet used for floor cleaning, which is interchangeably attached to a cleaning tool 200 that has, for example, a rectangular flat head portion 201 and a handle portion 202 attached to the upper surface of the head portion 201. This cleaning sheet 100 is used by being attached to the head portion 201 of the cleaning tool 200.

[0019] As shown in Figures 1, 4, and 5, the cleaning sheet 100 has a cleaning surface portion 101 that is positioned to cover the bottom surface of the head portion 201, and locking surface portions 102 that are on both sides of the cleaning surface portion 101 and are folded and locked to the upper surface of the head portion 201. Specifically, the rectangular cleaning sheet 100 covers the bottom surface of the head portion 201 of the cleaning tool 200 to form a cleaning surface, is folded along the fold line S along the longitudinal edge portion 201e of the head portion 201 and locked to the upper surface of the head portion 201, and is attached to the cleaning tool 200. The upper surface of the head portion 201 is provided with a locking portion 201a for locking the cleaning sheet 100. The longitudinal edge portion 201e of the head portion 201 refers to the edge along the longitudinal direction of the rectangular head portion 201. That is, it refers to the two edges on the longer side of the four edges of the rectangular head portion 201. Here, the boundary line between the cleaning surface portion 101 and the locking surface portion 102 of the cleaning sheet 100 corresponds to the fold line S described above. However, it is not limited to the boundary line between the cleaning surface portion 101 and the locking surface portion 102 being the fold line S; the fold line S may be on the cleaning surface portion 101 side or on the locking surface portion 102 side. In this way, the cleaning sheet 100 can be attached to the head portion 201 of the cleaning tool 200 so that the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor, or the cleaning sheet 100 can be attached to the head portion 201 of the cleaning tool 200 so that the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor.

[0020] [Cleaning Surface] The cleaning surface 101 of the cleaning sheet 100 is the part that is positioned to cover the bottom surface of the head portion 201 of the cleaning tool 200. In order to make it easier to rub the floor surface with the cleaning surface 101 of the cleaning sheet 100, the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are partially joined together on the cleaning surface 101 of the cleaning sheet 100. It is preferable that the three layers of the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined together on the cleaning surface 101 of the cleaning sheet 100, as this prevents the three layers from falling apart on the cleaning surface 101, making it possible to treat the cleaning surface 101 as a single sheet and making it easier to rub the floor surface.

[0021] The cleaning surface portion 101 of the cleaning sheet 100 in this embodiment is provided with a plurality of joint portions 20 having a configuration in which a hydrophobic nonwoven fabric layer 11, a waterproof layer 13, and a hydrophilic nonwoven fabric layer 12 are partially attached, and the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined by these joint portions 20. These joint portions 20 are configured as an assembly of embossed portions 21 formed by pressing the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 together.

[0022] [Joint and Embossed Sections of the Cleaning Surface] The joint 20, which is composed of an aggregate of embossed sections 21, is a section where the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are partially bonded together. Outside of the joint 20 (embossed section 21), the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are not bonded together but are laminated. The embossed section 21 is an uneven portion formed by embossing the three layers of the laminated hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12, by applying heat in the thickness direction and compressing them. The embossing process for forming the embossed section 21 on the fiber layer, and the technique for partially integrating multiple fiber layers by this embossing process, are the same as those known in the past and will not be described in detail here.

[0023] The embossed portion 21 provided on the cleaning sheet 100 of this embodiment has a roughly oval shape in plan view. The roughly oval shape referred to here includes a roughly elliptical shape, a roughly oblong shape, a roughly egg shape, a roughly rounded rectangle, and other slightly elongated, rounded shapes. The embossed portion 21 of this embodiment has a roughly oval shape in plan view and is formed in a roughly gourd shape with a constriction in the shorter direction. It is preferable that this embossed portion 21 has a rounded shape. If the embossed portion 21 has an angular shape, load is easily applied to the corners, and the embossed portion 21 is prone to tearing or other holes forming from there, which is undesirable.

[0024] Further, the joint portion 20 provided on the cleaning sheet 100 of the present embodiment is configured as an aggregate of three embossed portions 21. Specifically, the joint portion 20 of the present embodiment is provided in a mode where the three embossed portions 21 are arranged so as to exhibit a substantially three-leaf shape (or a substantially "pin" character shape). In particular, in the joint portion 20 of the present embodiment, at least one of the embossed portions 21 constituting the joint portion 20 is formed obliquely with respect to the longitudinal direction (herein, the X direction) and the transverse direction (herein, the Y direction) of the cleaning sheet 100. The three embossed portions 21 constituting the joint portion 20 of the present embodiment are each formed such that their longitudinal directions are obliquely inclined at different angles. When the cleaning sheet 100 is attached to the head portion 201 of a cleaning tool 200 for use, wiping cleaning is mainly performed by moving the cleaning sheet 100 in the X direction or the Y direction relative to the floor surface. If the embossed portions 21 having a substantially oval shape in a plan view are formed obliquely on the cleaning surface portion 101 of the cleaning sheet 100, the floor surface can be rubbed with the embossed portions 21 kept in an oblique orientation during wiping cleaning in either direction, whereby wiping cleaning in both directions can be suitably performed. For example, when an embossed portion 21 having a substantially oval shape in a plan view is arranged vertically and moved in its longitudinal direction to rub the floor surface, the area of the floor surface rubbed by the embossed portion 21 becomes narrow, which reduces the efficiency of scraping off dirt on the floor surface, and this is not preferable.

[0025] Note that, as shown in FIG. 1, 21 joint portions each having a substantially three-leaf shape are provided on the cleaning surface portion 101 of the cleaning sheet 100 of the present embodiment, and a total of 63 embossed portions 21 are provided. The 20 joint portions 20 are arranged in three rows in a staggered arrangement in the figure. Each joint portion 20 is arranged with an interval of about 30 mm to 45 mm from each other.

[0026] [Locking Surface] The locking surface 102 of the cleaning sheet 100 is the part that locks onto the locking portion 201a provided on the upper surface of the head portion 201 of the cleaning tool 200. The locking portion 201a provided on the upper surface of the head portion 201 is a hole with a claw portion, and the cleaning sheet 100 can be attached to the head portion 201 by pushing the locking surface 102 of the cleaning sheet 100 into the locking portion 201a and locking it in place by hooking it onto the claw portion. The structure and function of the locking portion 201a with a claw portion are the same as those of conventionally known people, so they will not be described in detail here. In order to make it easier to attach the cleaning sheet 100 to the head portion 201 of the cleaning tool 200, a hydrophobic nonwoven fabric layer 11, a waterproof layer 13, and a hydrophilic nonwoven fabric layer 12 are joined together on the locking surface 102 of the cleaning sheet 100. If the three layers of the cleaning sheet 100—the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12—are bonded together at the locking surface portion 102, the three layers will not separate at the locking surface portion 102, and the locking surface portion 102 can be treated as a single sheet. This is preferable because it makes it easier to lock the locking surface portion 102 of the cleaning sheet 100 to the locking portion 201a on the upper surface of the head portion 201. If the locking surface portion 102 of the cleaning sheet 100 is easy to lock to the head portion 201 and easy to attach, the cleaning sheet 100 can be properly attached to the head portion 201 of the cleaning tool 200, allowing for effective floor cleaning.

[0027] The locking surface portion 102 of the cleaning sheet 100 in this embodiment is provided with a plurality of embossed portions 21 formed by pressing together a hydrophobic nonwoven fabric layer 11, a waterproof layer 13, and a hydrophilic nonwoven fabric layer 12, and the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined together by these plurality of embossed portions 21.

[0028] [Embossed portion of the locking surface] The embossed portion 21 of the locking surface portion 102 of the cleaning sheet 100 is formed by the same embossing process as the embossed portion 21 of the cleaning surface portion 101 described above. Each embossed portion 21 has a roughly oval shape in plan view and is formed in a roughly gourd shape with a constriction in the shorter direction. The locking surface portion 102 is provided with a plurality of roughly rhombic embossed blocks, which are aggregates of a predetermined number of embossed portions 21. Each embossed block is formed in such a manner that a predetermined number of embossed portions 21 are arranged diagonally. The embossed portions 21 are formed more densely on the locking surface portion 102 than on the cleaning surface portion 101, and the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are more firmly bonded together.

[0029] [a. Hydrophilic Fibers] Hydrophilic fibers can include natural fibers such as cotton, pulp, and hemp, as well as regenerated fibers such as rayon and cupro.

[0030] [b. Hydrophobic Fibers] 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 can be used individually or in combination of two or more types. Examples of composite fibers of two or more types include core-sheath type fibers 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 side-back type fibers in which a low-melting point resin and a high-melting point resin are arranged in parallel in a predetermined direction.

[0031] [c Hydrophilic Nonwoven Layer] The hydrophilic nonwoven layer 12 is a nonwoven fabric manufactured by bonding predetermined fibers together using well-known techniques such as spunlace, air-through, airlaid, point bond, spunbond, and needle punch. It is particularly preferable that the nonwoven fabric be manufactured using the spunlace method. As mentioned above, the hydrophilic nonwoven layer 12 is a nonwoven fabric containing at least hydrophilic fibers. This hydrophilic nonwoven layer 12 has a higher proportion of hydrophilic fibers than the hydrophobic nonwoven layer 11. Since the hydrophilic nonwoven layer 12 is impregnated with a chemical solution, the proportion of hydrophilic fibers, which have good affinity with the chemical solution, is increased. For example, it is preferable that the proportion of hydrophilic fibers in the hydrophilic nonwoven layer 12 is 40% or more, and the proportion of hydrophobic fibers is 60% or less. By making the proportion of hydrophilic fibers in the hydrophilic nonwoven layer 12 40% or more, improved liquid retention (water retention) can be obtained when the hydrophilic nonwoven layer 12 is impregnated with a chemical solution. Furthermore, the hydrophilic nonwoven fabric layer 12 impregnated with the chemical solution can be suitably used for wet wiping. The basis weight of the hydrophilic nonwoven fabric layer 12 is 20 to 100 g / m². ２ (gsm) is preferred. Basis weight refers to the basis weight measured in accordance with JIS P8124:2011.

[0032] [d Hydrophobic Nonwoven Layer] The hydrophobic nonwoven layer 11 is a nonwoven fabric manufactured by bonding predetermined fibers together using well-known techniques such as spunlace, air-through, air-laid, point bond, spunbond, and needle punch. It is particularly preferable that the nonwoven fabric be manufactured using the spunlace method. As mentioned above, the hydrophobic nonwoven layer 11 is a nonwoven fabric containing at least hydrophobic fibers. The hydrophobic fibers used in the hydrophobic nonwoven layer 11 are preferably of a thick fineness of, for example, 5.0 to 7.8 dtex. The hydrophobic nonwoven layer 11 has a lower hydrophilic fiber content than the hydrophilic nonwoven layer 12. Since the hydrophobic nonwoven layer 11 is not impregnated with chemicals, the hydrophilic fiber content is kept low. For example, it is preferable that the hydrophilic fiber content in the hydrophobic nonwoven layer 11 is less than 40% and more than 60%. Furthermore, the hydrophobic nonwoven layer 11 does not need to contain hydrophilic fibers. In this embodiment, a hydrophobic nonwoven fabric layer 11 having a hydrophobic fiber content of 100% is used. The hydrophobic nonwoven fabric layer 11, which is not impregnated with a chemical solution, can be suitably used for dry wiping. The basis weight of the hydrophobic nonwoven fabric layer 11 is 20 to 60 g / m². ２ (gsm) is preferred. Basis weight refers to the basis weight measured in accordance with JIS P8124:2011.

[0033] [e Waterproof Layer] The waterproof layer 13 is a waterproof sheet that is impermeable to liquids. As the waterproof sheet, a film made by molding a resin such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET) into a thin film can be used. This waterproof layer 13 is interposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, so that the chemical solution impregnated in the hydrophilic nonwoven fabric layer 12 does not seep out to the hydrophobic nonwoven fabric layer 11. In other words, the wet hydrophilic nonwoven fabric layer 12 and the dry hydrophobic nonwoven fabric layer 11 are provided adjacent to each other with the waterproof layer 13 in between.

[0034] [f. Chemical Solution] The chemical solution used to impregnate the hydrophilic nonwoven fabric layer 12 of the cleaning sheet 100 described above is a weakly alkaline solution with a hydrogen ion concentration (pH) of 8.0 to 9.0, containing 0.01% to 0.25% by mass of polyoxyalkylene alkyl ether and 0.00% to 5.00% by mass of ethanol. However, the components and properties of the chemical solution are not limited to these and are arbitrary. For example, the hydrophilic nonwoven fabric layer 12 may be impregnated with water or purified water that contains almost no chemical components.

[0035] [Effects of Embodiment 1] As described above, the cleaning sheet 100 of Embodiment 1 has a joint portion 20 on the cleaning surface portion 101 which is an aggregate of embossed portions 21. The hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined by this joint portion 20. Therefore, when wiping the floor surface with the cleaning surface portion 101, the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 do not shift, allowing for effective wiping. In particular, by making the joint portion 20 an aggregate of embossed portions 21, wrinkles that occur around the joint portion 20 can be suppressed, making it possible to effectively wipe the floor surface with the entire surface of the cleaning surface portion 101.

[0036] Furthermore, the embossed portion 21 constituting the joint portion 20 has a roughly oval shape (roughly gourd-shaped) in plan view, and since the embossed portion 21 is formed at an angle on the cleaning surface portion 101, the embossed portion 21 can be positioned at an angle to rub against the floor surface when wiping in either vertical or horizontal directions, making it possible to effectively wipe in both directions.

[0037] Furthermore, with this cleaning sheet 100, the cleaning sheet 100 can be attached to the head portion 201 of the cleaning tool 200 so that the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor, or so that the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor. As a result, both sides of the cleaning sheet 100 can be used to wipe and clean effectively, enabling cleaning that simultaneously removes dirt and collects debris.

[0038] [Example of Embodiment 1] Next, the results of evaluation for an example of the present invention (Embodiment 1) will be described. Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

[0039] <Sample Preparation> Eight types of cleaning sheets 100 were produced with adjusted emboss patterns provided on the cleaning surface 101 of the cleaning sheet 100, and a test was performed to simulate wiping cleaning by rubbing a floor surface using each cleaning sheet 100.

[0040] As shown in FIG. 1, the cleaning surface 101 of the cleaning sheet 100 of Example 1 is provided with joined portions 20 each being an aggregate of three embossed portions 21. The three embossed portions 21 constituting the joined portion 20 are each formed in an orientation in which the longitudinal direction thereof is obliquely inclined at different angles. This cleaning surface 101 is provided with three rows of joined portions 20 arranged such that the three embossed portions 21 have a substantially "pin" (Chinese character for product) shape, and a total of 63 embossed portions 21 are provided on the cleaning surface 101. These 63 embossed portions 21 occupy 12% of the cleaning surface 101. (In other words, the embossed area ratio in the cleaning surface 101 of Example 1 is 12%.)

[0041] As shown in Figure 6, the cleaning surface 101 of the cleaning sheet 100 in Example 2 is provided with a joint 20 which is an assembly of two embossed portions 21. The two embossed portions 21 constituting the joint 20 are formed with their longitudinal directions tilted at different angles. The cleaning surface 101 is provided with three rows of joints 20, each row of two embossed portions 21 arranged in a roughly "V" shape, resulting in a total of 64 embossed portions 21 on the cleaning surface 101. These 64 embossed portions 21 account for 12.8% of the cleaning surface 101. Of the three rows of joints 20, the embossed portions 21 of the central joint 20 are arranged relatively horizontally, while the embossed portions 21 of the left and right joints 20 are arranged relatively vertically. Furthermore, of the three rows of joints 20, the central joint 20 is more densely packed than the left and right joints 20. Furthermore, among the three rows of joints 20, the central joint 20 has portions that are close to each other, so it can be said that it is more accurate to say that it is a row of four embossed portions 21 (joints 20) rather than a row of two embossed portions 21 (joints 20).

[0042] As shown in Figure 7, the cleaning surface 101 of the cleaning sheet 100 in Example 3 is provided with a joint 20 which is an assembly of two embossed portions 21. The two embossed portions 21 constituting the joint 20 are formed with their longitudinal directions tilted at different angles. The cleaning surface 101 has three rows of joints 20 arranged so that the two embossed portions 21 form a roughly "V" shape, and the cleaning surface 101 has 42 embossed portions 21 in total. These 42 embossed portions 21 account for 8.4% of the cleaning surface 101. The embossed portions 21 of the three rows of joints 20 are arranged relatively horizontally.

[0043] As shown in FIG. 8, the cleaning surface portion 101 of the cleaning sheet 100 of Example 4 is provided with a joining portion 20 that is an aggregate of two embossed portions 21. The two embossed portions 21 constituting the joining portion 20 are each formed such that their longitudinal directions are obliquely inclined at different angles. Three rows of the joining portions 20, in which two embossed portions 21 are arranged so as to substantially form a Japanese character "ha" shape, are provided on the cleaning surface portion 101, and 48 embossed portions 21 are provided on the cleaning surface portion 101. The 48 embossed portions 21 occupy 9.6% of the cleaning surface portion 101. It should be noted that the embossed portions 21 of the three rows of joining portions 20 are arranged relatively vertically.

[0044] As shown in FIG. 9, the cleaning surface portion 101 of the cleaning sheet 100 of Comparative Example 1 is not provided with a joining portion 20 that is an aggregate of the embossed portions 21. That is, the number of embossed portions 21 provided on the cleaning surface portion 101 is zero, and the embossed area ratio in the cleaning surface portion 101 is 0%.

[0045] As shown in FIG. 10, the cleaning surface portion 101 of the cleaning sheet 100 of Comparative Example 2 is provided with a joining portion 20 that is an aggregate of two embossed portions 21. The two embossed portions 21 constituting the joining portion 20 are each formed such that their longitudinal directions are obliquely inclined at different angles. Two rows of the joining portions 20, in which two embossed portions 21 are arranged so as to substantially form a Japanese character "ha" shape, are provided on the cleaning surface portion 101, and 32 embossed portions 21 are provided on the cleaning surface portion 101. The 32 embossed portions 21 occupy 6.4% of the cleaning surface portion 101. It should be noted that the embossed portions 21 of the two rows of joining portions 20 are arranged relatively vertically.

[0046] As shown in FIG. 11, the cleaning surface portion 101 of the cleaning sheet 100 of Comparative Example 3 is provided with the bonded portions 20 that are aggregates of three embossed portions 21. The cleaning surface portion 101 is provided with three rows of the bonded portions 20 in which the three embossed portions 21 are arranged so as to form a substantially "pin" shape, and 96 embossed portions 21 are provided on the cleaning surface portion 101. The 96 embossed portions 21 occupy 19.2% of the cleaning surface portion 101. Among the three rows of bonded portions 20, the center-side bonded portions 20 include vertically arranged embossed portions 21, and the left and right bonded portions 20 include horizontally arranged embossed portions 21. Further, among the three rows of bonded portions 20, the center-side bonded portions 20 are provided more densely than the left and right bonded portions 20, and the vertical embossed portions 21 in the center-side bonded portions 20 are vertically aligned and adjacent to each other. Further, among the three rows of bonded portions 20, since the center-side bonded portions 20 have portions that are close to each other, it can be said that aggregates of six embossed portions 21 (bonded portions 20) form a row, rather than aggregates of three embossed portions 21 (bonded portions 20) forming a row.

[0047] As shown in FIG. 12, the cleaning surface portion 101 of the cleaning sheet 100 of Comparative Example 4 is provided with the bonded portions 20 that are aggregates of three embossed portions 21. The cleaning surface portion 101 is provided with three rows of the bonded portions 20 in which the three embossed portions 21 are arranged so as to form a substantially "pin" shape, and 156 embossed portions 21 are provided on the cleaning surface portion 101. The 156 embossed portions 21 occupy 25.6% of the cleaning surface portion 101. Note that each of the three rows of bonded portions 20 includes a horizontally arranged embossed portion 21. Further, among the three rows of bonded portions 20, the center-side bonded portions 20 are provided more densely than the left and right bonded portions 20, and the respective bonded portions 20 are provided close to each other so as not to overlap. Further, among the three rows of bonded portions 20, the center-side bonded portions 20 are close to each other, so it can be said that countless embossed portions 21 form an aggregate row, rather than that aggregates of three embossed portions 21 (bonded portions 20) form a row.

[0048] <Test Method> The cleaning sheets 100 of Examples 1-4 and Comparative Examples 1-4 described above were attached to the head portion 201 of the cleaning tool 200, and a wiping test was performed by rubbing the floor surface with the cleaning surface portion 101 of the cleaning sheet 100. In this test, a 50 cm area of ​​the top surface of the wooden flooring material was subjected to a load of 3 kgf and the wiping test was performed with five back-and-forth movements. In addition, five wet wiping tests were performed on the hydrophilic nonwoven fabric layer 12 side, and the condition of the cleaning surface portion 101 of a total of five cleaning sheets 100 after the test was visually checked. The items checked were the lamination misalignment of the three layers of the cleaning sheet 100 and the presence of holes in the cleaning sheet 100.

[0049] <Lamination Misalignment> Tests were judged as A (Excellent) if there were no wrinkles on the cleaned surface 101 after the test, no misalignment between the hydrophobic nonwoven fabric layer 11 and the waterproof layer 13, and no misalignment between the hydrophilic nonwoven fabric layer 12 and the waterproof layer 13. On the other hand, tests were judged as C (Unacceptable) if there were many wrinkles on the cleaned surface 101 after the test, and the hydrophobic nonwoven fabric layer 11 and the waterproof layer 13 were misaligned, or the hydrophilic nonwoven fabric layer 12 and the waterproof layer 13 were misaligned. The test results are shown in [Table I].

[0050] <Sheet Perforation> Cleaning sheets 100 with 0 (zero) holes in the cleaning surface 101 after testing were judged as S (Excellent). Cleaning sheets 100 with 1 to 2 holes in the cleaning surface 101 after testing were judged as A (Good). Cleaning sheets 100 with 3 to 6 holes in the cleaning surface 101 after testing were judged as B (Acceptable). Cleaning sheets 100 with 7 or more holes in the cleaning surface 101 after testing were judged as C (Unacceptable). The number of holes was judged based on the average of a total of 5 cleaning sheets 100 tested. The test results are shown in [Table I].

[0051]

[0052] ​<Test Results> As shown in Table I, the cleaning sheets 100 of Examples 1 to 4 all received an A rating for both the lamination misalignment item and the sheet perforation item, confirming that they can be suitably used for wiping and scrubbing floor surfaces. Furthermore, as shown in Table I, cleaning sheets 100 with an embossed area ratio of 8.4 to 12.8% on the cleaning surface portion 101 can be suitably used for wiping and scrubbing floor surfaces.

[0053] On the other hand, as shown in Table I, the cleaning sheets 100 of Comparative Examples 1 and 2 received a C rating for lamination misalignment, confirming that wrinkles formed on the cleaning surface 101, resulting in lamination misalignment. For example, as shown in Table I, it can be seen that if the cleaning sheet 100 has an embossed area ratio of 6.4% or less on the cleaning surface 101, wrinkles will form on the cleaning surface 101, resulting in lamination misalignment. Thus, it was found that if there are few embossed areas 21 on the cleaning surface 101, lamination misalignment is more likely to occur, which can hinder wiping.

[0054] Furthermore, as shown in Table I, the cleaning sheet 100 of Comparative Example 3 received a B rating for sheet perforation, while the cleaning sheet 100 of Comparative Example 4 received a C rating for sheet perforation. For example, as shown in Table I, it can be seen that when the embossed area ratio on the cleaning surface 101 is 19.2% or more, perforation is likely to occur on the cleaning surface 101. Thus, it was found that when the number of embossed areas 21 on the cleaning surface 101 increases, perforation is more likely to occur on the cleaning surface 101, which hinders wiping.

[0055] In the case of the cleaning sheet 100 of Comparative Example 3, it was found that at the joint 20 on the central side of the cleaning surface 101 (see Figure 11), holes that occur in areas where vertically oriented embossed portions 21 are aligned vertically tend to connect and become larger, easily hindering wiping. In the case of the cleaning sheet 100 of Comparative Example 4, at the joint 20 on the central side of the cleaning surface 101 (see Figure 12), all the embossed portions 21 are close to each other, so if a hole occurs in any of the embossed portions 21, that hole can cause a hole in the adjacent embossed portion 21, and these holes tend to connect and become larger, easily hindering wiping.

[0056] As described above, the cleaning sheets 100 of Examples 1 to 4 in Embodiment 1 can be suitably used for wiping and cleaning floor surfaces.

[0057] (Embodiment 2) Next, Embodiment 2 of the cleaning sheet according to the present invention will be described. The same parts as in Embodiment 1 are denoted by the same reference numerals, and only the different parts will be described.

[0058] [Slits] The locking surface portion 102 of the cleaning sheet 100 of Embodiment 2 is provided with a plurality of slits 30 extending in a direction substantially parallel to the fold line S along the boundary line between the locking surface portion 102 and the cleaning surface portion 101, as shown in Figure 13, for example. These slits 30 are cuts made in the direction along the boundary line (fold line S) between the locking surface portion 102 and the cleaning surface portion 101, and are provided to connect the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12. For example, a plurality of slits 30 can be made in the locking surface portion 102 of the cleaning sheet 100 using a cutter roll. The plurality of slits 30 provided in the locking surface portion 102 are arranged in a staggered pattern.

[0059] In this second embodiment, the locking surface portion 102 of the cleaning sheet 100 is also provided with a plurality of roughly diamond-shaped embossed blocks, which are aggregates of a predetermined number of embossed portions 21, similar to the first embodiment. However, in order to make the illustrated slit 30 easier to see, the illustration of the embossed portions 21 is omitted, and instead the locking surface portion 102 is colored gray.

[0060] When attaching the cleaning sheet 100 to the head portion 201 of the cleaning tool 200, for example, as shown in Figure 14, the cleaning surface portion 101 is positioned to cover the bottom surface of the head portion 201, and the locking surface portion 102, which is folded along the fold line S, is locked to the locking portion 201a on the upper surface of the head portion 201. When the locking surface portion 102 is locked to the locking portion 201a, at least a part of the slit 30 provided on the locking surface portion 102 is configured to engage with the locking portion 201a (see Figure 14). For example, the locking portion 201a on the upper surface of the head portion 201 has a claw portion, and the locking surface portion 102 is locked to the locking portion 201a by the slit 30 catching on the claw portion of the locking portion 201a. Then, as shown in Figure 14, the cleaning sheet 100 can be easily attached to the head portion 201 by pushing the locking surface portion 102 of the cleaning sheet 100 into the locking portion 201a and locking it in place by hooking the slit 30 onto the claw portion.

[0061] In particular, when the locking surface portion 102 is locked to the locking portion 201a, the slit 30 provided in the locking surface portion 102 expands, causing the locking surface portion 102 to extend, making it easier to lock the locking surface portion 102 to the locking portion 201a. Specifically, when locking the locking surface portion 102 to the locking portion 201a, pushing the locking surface portion 102 into the locking portion 201a and extending it causes the slit 30 in the locking surface portion 102 to expand, making it easy to lock the locking portion 201a into the slit 30.

[0062] Furthermore, since the slit 30 is expanded and the locking surface portion 102 extends, it becomes easier to remove the locking surface portion 102 that is locked to the locking portion 201a from the locking portion 201a. Specifically, when removing the locking surface portion 102 from the locking portion 201a, pulling and extending the locking surface portion 102 expands the slit 30, allowing the locking portion 201a to be easily removed from the slit 30.

[0063] [Effects of Embodiment 2] As described above, the cleaning sheet 100 of Embodiment 2 has a plurality of slits 30 arranged in a staggered pattern on the locking surface portion 102, and the slits 30 on the locking surface portion 102 expand, causing the locking surface portion 102 to extend, making it easy to attach and detach the cleaning sheet 100 to the head portion 201 of the cleaning tool 200. Because the cleaning sheet 100 is easy to attach and detach from the head portion 201, both sides of the cleaning sheet 100 can be used to perform wiping and cleaning effectively. Specifically, after wet wiping by attaching the cleaning sheet 100 to the head portion 201 of the cleaning tool 200 so that the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor, the cleaning sheet 100 can be removed, turned over, and then attached to the head portion 201 of the cleaning tool 200 so that the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor, and dry wiping can be performed.

[0064] [Example of Embodiment 2] Next, the results of the evaluation of an embodiment of the present invention (Embodiment 2) will be described. The present invention will be specifically described below with reference to the examples, but the present invention is not limited to these.

[0065] <Sample Creation> Seven types of cleaning sheets 100 were created by adjusting the pattern of the slits 30 provided on the locking surface portion 102 of the cleaning sheet 100, and tests were conducted on the slits 30 using each cleaning sheet 100. In the following, "slit width" corresponds to the cut length of the slit 30, and "pitch width" corresponds to the spacing of the slits 30 within the row of slits.

[0066] As shown in Figure 13, the locking surface portion 102 of the cleaning sheet 100 in Example 5 has five rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 10 mm, a pitch width of 10 mm, and a spacing of 5.0 mm between slit rows. In addition, the slits 30 of adjacent rows partially overlap each other, with an overlap of 2 mm.

[0067] As shown in Figure 15, the locking surface portion 102 of the cleaning sheet 100 in Example 6 has seven rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 10 mm, a pitch width of 10 mm, and a spacing of 3.0 mm between slit rows. In addition, the slits 30 of adjacent rows partially overlap each other, with an overlap of 2 mm.

[0068] As shown in Figure 16, the locking surface portion 102 of the cleaning sheet 100 in Comparative Example 5 does not have a slit 30. In other words, the cleaning sheet 100 of Comparative Example 5 corresponds to the cleaning sheet 100 shown in Figure 1.

[0069] As shown in Figure 17, the locking surface portion 102 of the cleaning sheet 100 in Comparative Example 6 has three rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 20 mm, a pitch width of 10 mm, and a spacing of 10 mm between slit rows. In addition, the slits 30 of adjacent rows of slits partially overlap each other, with an overlap of 5 mm.

[0070] As shown in Figure 18, the locking surface portion 102 of the cleaning sheet 100 in Comparative Example 7 has five rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 10 mm, a pitch width of 10 mm, and a spacing of 2.5 mm between slit rows. In addition, the slits 30 of adjacent rows partially overlap each other, with an overlap of 2 mm.

[0071] As shown in Figure 19, the locking surface portion 102 of the cleaning sheet 100 in Comparative Example 8 has five rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 10 mm, a pitch width of 10 mm, and a spacing of 2.5 mm between slit rows. Furthermore, the slits 30 in adjacent rows do not overlap with each other in any part, and the slit overlap is 0 mm.

[0072] As shown in Figure 20, the locking surface portion 102 of the cleaning sheet 100 in Comparative Example 9 has 9 rows of slits, with multiple slits 30 arranged in a staggered pattern, each with a slit width of 10 mm, a pitch width of 10 mm, and a spacing of 2.5 mm between slit rows. In addition, the slits 30 of adjacent rows partially overlap each other, with a slit overlap of 2 mm.

[0073] <Test Method 1: Difficulty of the Cleaning Sheet Detaching from the Cleaning Tool> The cleaning sheets 100 of Examples 5-6 and Comparative Examples 5-9 described above were attached to the head portion 201 of the cleaning tool 200, and the following test was conducted to determine how difficult it was for the cleaning sheet to detach from the head portion 201. 1. One locking surface portion 102 on one side of the cleaning sheet 100 was pressed into the locking portion 201a of the head portion 201 to attach it. 2. The head portion 201 was fixed to a tensile testing machine, and the other locking surface portion 102 of the cleaning sheet 100 attached to the head portion 201 was attached to the arm of the tensile testing machine and pulled, and the tensile stress when the cleaning sheet 100 detached from the head portion 201 was measured. Note that if the tensile stress exceeds 15N the waterproof layer 13 will tear, so the test was conducted with a maximum of 15N. This measurement was performed 10 times, and the average value was taken as the test value.

[0074] The test value of the cleaning sheet 100 of Example 5 (Figure 13) was 9.5 N. The test value of the cleaning sheet 100 of Example 6 (Figure 15) was 13.0 N. The test value of the cleaning sheet 100 of Comparative Example 5 (Figure 16) was 6.2 N. The test value of the cleaning sheet 100 of Comparative Example 6 (Figure 17) was 8.3 N. The test value of the cleaning sheet 100 of Comparative Example 7 (Figure 18) was 11.3 N. The test value of the cleaning sheet 100 of Comparative Example 8 (Figure 19) was 12.1 N. The test value of the cleaning sheet 100 of Comparative Example 9 (Figure 20) was 13.7 N.

[0075] Thus, the test values ​​for Comparative Example 5, in which the locking surface portion 102 does not have a slit 30, and Comparative Example 6, in which the locking surface portion 102 has a roughly provided slit 30, were 9.0 N or less, indicating low tensile stress values. From this, it was confirmed that the cleaning sheet 100 of Comparative Example 5 and the cleaning sheet 100 of Comparative Example 6 are easily detached from the head portion 201.

[0076] <Test Method 2: Tear Resistance of the Locking Surface of the Cleaning Sheet> The following test was conducted regarding the tear resistance of the locking surface 102 of the cleaning sheet 100 in Examples 5-6 and Comparative Examples 5-9 described above. 1. One side of the locking surface 102 of the cleaning sheet 100 was pushed into the locking portion 201a of the head portion 201 to a depth of 15 mm, and then the cleaning sheet 100 was pulled out. This was repeated 10 times, and the number of times the slit 30 of the locking surface 102 was torn and torn was visually confirmed. Here, "tear" refers to a state in which the slit width of the slit 30 has increased after the test. Here, "tear" refers to a state in which adjacent slits 30 have become connected due to "tear". If both the number of tears and torns were 0, it was judged as S (excellent). Items with 1-2 tears or rips were judged as A (Excellent). Items with 3-4 tears or rips were judged as B (Acceptable). Items with 5-10 tears or rips were judged as C (Unacceptable).

[0077] The cleaning sheet 100 of Example 5 (Figure 13) received an S rating for the number of tears and a S rating for the number of rips. The cleaning sheet 100 of Example 6 (Figure 15) received an A rating for the number of tears and a S rating for the number of rips. The cleaning sheet 100 of Comparative Example 5 (Figure 16) received an S rating for the number of tears and a S rating for the number of rips. The cleaning sheet 100 of Comparative Example 6 (Figure 17) received a C rating for the number of tears and a S rating for the number of rips. The cleaning sheet 100 of Comparative Example 7 (Figure 18) received an S rating for the number of tears and a C rating for the number of rips. The cleaning sheet 100 of Comparative Example 8 (Figure 19) received a B rating for the number of tears and a S rating for the number of rips. The cleaning sheet 100 of Comparative Example 9 (Figure 20) received a B rating for the number of tears and a A rating for the number of rips.

[0078] Thus, in Comparative Examples 6 to 9, the cleaning sheets 100 received a B or C rating for either the number of tears or the number of rips, indicating that the slits 30 are prone to defects. Note that the cleaning sheet 100 of Comparative Example 5 does not have slits 30, so no rating is given. In contrast, the cleaning sheets 100 of Examples 5 and 6 received an S or A rating for both the number of tears and the number of rips, indicating that the slits 30 are less prone to defects. Therefore, with the cleaning sheets 100 of Examples 5 and 6, it is possible to repeatedly attach and detach them from the head portion 201 of the cleaning tool 200, allowing for suitable wiping on both sides of the cleaning sheet 100. In other words, it was found that if multiple slits 30 are provided on the locking surface portion 102 of the cleaning sheet 100 in a staggered arrangement with a slit width of 10 mm, a pitch width of 10 mm, and a slit row spacing of 3.0 to 5.0 mm, defects in the slits 30 are less likely to occur.

[0079] As described above, the cleaning sheets 100 of Examples 5 and 6 in Embodiment 2 are less likely to come off the head portion 201 of the cleaning tool 200, and can be attached to and detached from the head portion 201, so the cleaning sheets 100 can be attached to the cleaning tool 200 and used for effective wiping.

[0080] Furthermore, with the cleaning sheet 100 of this embodiment, the cleaning sheet 100 can be attached to the head portion 201 of the cleaning tool 200 so that the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor, or the cleaning sheet 100 can be attached to the head portion 201 of the cleaning tool 200 so that the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 becomes the cleaning surface that rubs against the floor. In other words, since both sides of the cleaning sheet 100 can be used for wiping, cleaning can be performed that simultaneously removes dirt and collects debris.

[0081] In the embodiments described above, the cases in Examples 5 and 6 were explained using the example where a joint portion 20, which is an aggregate of three embossed portions 21, is provided on the cleaning surface portion 101 of the cleaning sheet 100. However, the present invention is not limited to this, and the joint portion 20, which is an aggregate of two or four embossed portions 21, may be provided on the cleaning surface portion 101.

[0082] Furthermore, in the embodiments described above, the case in which the cleaning surface portion 101 of the cleaning sheet 100 in Examples 5 and 6 is provided with a joint portion 20 which is an assembly of three embossed portions 21, was explained as an example. However, the present invention is not limited thereto, and as long as the cleaning sheet 100 is not easily detached from the head portion 201 and can be attached to and detached from the head portion 201 in a suitable manner, the cleaning surface portion 101 does not need to be provided with embossed portions 21 (joint portion 20).

[0083] Furthermore, it goes without saying that other specific structural details can be modified as needed.

[0084] Since the present invention is configured as described above, it can be used as a cleaning sheet.

[0085] 11 Hydrophobic nonwoven fabric layer 12 Hydrophilic nonwoven fabric layer 13 Waterproof layer 20 Joint 21 Embossed part 30 Slit 100 Cleaning sheet 101 Cleaning surface 102 Locking surface S Fold line 200 Cleaning tool 201 Head part 201a Locking part 202 Handle part

Claims

1. A cleaning sheet comprising a hydrophobic nonwoven fabric layer, a hydrophilic nonwoven fabric layer, and a waterproof layer interposed between the hydrophobic nonwoven fabric layer and the hydrophilic nonwoven fabric layer, wherein the cleaning sheet is used attached to the head portion of a cleaning tool, and the cleaning sheet has a cleaning surface portion arranged to cover the bottom surface of the head portion, and locking surfaces located on both sides of the cleaning surface portion and folded and locked to the upper surface of the head portion, wherein the cleaning surface portion is provided with a plurality of joint portions having a configuration in which the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer are partially attached, and the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer are joined by the joint portions, and the joint portions are configured as an aggregate of embossed portions formed by the pressure bonding of the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer.

2. The cleaning sheet according to claim 1, characterized in that the embossed portion has a substantially oval shape in plan view, and at least one of the embossed portions constituting the joint portion is formed at an angle with respect to the vertical and horizontal directions of the cleaning sheet.

3. The cleaning sheet according to claim 2, characterized in that the joint portion is composed of two to four embossed portions.

4. The cleaning sheet according to claim 1, characterized in that the embossed portion provided on the cleaning surface occupies 8.4 to 12.8% of the cleaning surface.

5. The cleaning sheet according to any one of claims 1 to 4, characterized in that the locking surface portion is provided with a plurality of slits extending in a direction substantially parallel to the fold line along the boundary line between the locking surface portion and the cleaning surface portion, and at least a portion of the slits engages with the locking portion when the locking surface portion is locked to the locking portion provided on the upper surface of the head portion.

6. The cleaning sheet according to claim 5, characterized in that the plurality of slits are arranged in a staggered pattern.

7. The cleaning sheet according to claim 5, characterized in that the locking surface portion is provided with a plurality of embossed portions formed by the bonding of the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer, and the plurality of embossed portions join the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer.

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