Cleaning sheet

Abstract

In a cleaning sheet 100 comprising a hydrophobic nonwoven fabric layer 11 including at least hydrophobic fibers, a hydrophilic nonwoven fabric layer 12 including at least hydrophilic fibers and having a greater rate of incorporation of the hydrophilic fibers than that of the hydrophobic nonwoven fabric layer, and a waterproofing layer 13 disposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, wherein the hydrophobic nonwoven fabric layer 11, the waterproofing layer 13, and the hydrophilic nonwoven fabric layer 12 are layered and bonded together, the hydrophilic nonwoven fabric layer 12 was configured to be impregnated with a chemical liquid. Thereby, it is possible to use the front and back of the cleaning sheet 100 separately: cleaning for mopping up soilage on a floor surface can be appropriately performed with the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100, and cleaning for collecting refuse on the floor surface can be appropriately performed with 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 non-woven fabric layer with a high impregnation rate of a chemical solution and a hydrophobic non-woven fabric layer with a low impregnation rate of the chemical solution is known (for example, see Patent Document 1). When using this wet cleaning sheet, it is recommended to use the surface on the hydrophilic non-woven fabric layer side as the dirt wiping surface and the surface on the hydrophobic non-woven fabric layer side as the finishing wiping surface.

[0003] Japanese Patent No. 6960719

[0004] By the way, when cleaning the floor using a wet-type cleaning sheet such as the wet cleaning sheet of Patent Document 1 above, even if it is possible to wipe off well the spilled food stains and sebum stains stuck to the floor, it may not be possible to completely collect fine dust such as hair, fiber debris, and dust. Thus, in the wet-type cleaning sheet, there are cases where the performance of collecting fine dust is inferior to that of the dry-type cleaning sheet, but there is a significant demand for performing cleaning that combines wiping off dirt and collecting dust.

[0005] An object of the present invention is to provide a cleaning sheet that enables cleaning that combines wiping off dirt and collecting dust.

[0006] In order to solve the above problems, the invention according to claim 1 includes: a hydrophobic non-woven fabric layer containing at least hydrophobic fibers; a hydrophilic non-woven fabric layer containing at least hydrophilic fibers and having a higher blending ratio of hydrophilic fibers than the hydrophobic non-woven fabric layer; a non-liquid-permeable waterproof layer disposed between the hydrophobic non-woven fabric layer and the hydrophilic non-woven fabric layer; and the hydrophobic non-woven fabric layer, the waterproof layer, and the hydrophilic non-woven fabric layer are laminated and joined. The cleaning sheet is characterized in that the hydrophilic non-woven fabric layer is impregnated with a chemical solution.

[0007] The invention described in claim 2 is a cleaning sheet according to claim 1, wherein the hydrophobic nonwoven fabric layer is bonded to one side of the waterproof layer, the hydrophilic nonwoven fabric layer is bonded to the other side of the waterproof layer, and the waterproof layer is provided with a mark to distinguish between the one side and the other side.

[0008] The invention described in claim 3 is characterized in that, in the cleaning sheet described in claim 2, the mark provided on one side of the waterproof layer is made visible by passing through the hydrophobic nonwoven fabric layer, and the mark provided on the other side of the waterproof layer is made visible by passing through the hydrophilic nonwoven fabric layer.

[0009] The invention described in claim 4 is a cleaning sheet according to any one of claims 1 to 3, wherein the cleaning sheet is used attached to the head portion of a cleaning tool, and has a cleaning surface portion that is arranged to cover the bottom surface of the head portion, and locking surfaces portion that are on both sides of the cleaning surface portion and are folded and locked to the upper surface side of the head portion, wherein at least the locking surfaces portion are bonded together with the hydrophobic nonwoven fabric layer, the waterproof layer and the hydrophilic nonwoven fabric layer.

[0010] The invention described in claim 5 is a cleaning sheet described in claim 4, wherein the cleaning sheet is configured to have: a joint portion in which the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer are joined in a manner in which they are attached to each other; and a non-joint portion in which the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer are not joined in a manner in which they are laminated, and the proportion of the joint portion in the locking surface portion is 40% or more.

[0011] According to the present invention, a cleaning sheet is obtained that enables cleaning while simultaneously wiping away dirt and collecting debris.

[0012] This is a plan view showing the cleaning sheet of this embodiment. 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 showing a cleaning tool to which the cleaning sheet of this embodiment is attached. This is a modified example of the cleaning sheet, an explanatory diagram relating to a mark (DRY) provided on one side, showing a portion of the hydrophobic nonwoven fabric layer cut. This is a modified example of the cleaning sheet, an explanatory diagram relating to a mark (WET) provided on the other side, showing a portion of the hydrophilic nonwoven fabric layer cut.

[0013] 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 solely 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 Figure 4. Furthermore, 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.

[0014] [1. Explanation of the structure] First, the structure of the cleaning sheet 100 will be explained.

[0015] [(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 disposed 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.

[0016] [(2) Condition during use] As shown in Figure 4, 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. The cleaning sheet 100 is used by being attached to the head portion 201 of the cleaning tool 200.

[0017] As shown in Figures 1 and 4, 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 longitudinal edge portion 201a of the head portion 201 at the fold line S and locked to the upper surface of the head portion 201, and is attached to the cleaning tool 200. The longitudinal edge portion 201a 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. Furthermore, the boundary line between the cleaning surface portion 101 and the locking surface portion 102 is not limited to being a 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.

[0018] Furthermore, in order to facilitate the attachment of the cleaning sheet 100 to the head portion 201 of the cleaning tool 200, the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined together at least at the locking surface portion 102 of the cleaning sheet 100. If the three layers of the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined together at the locking surface portion 102 of the cleaning sheet 100, 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 a predetermined mounting location provided on the upper surface of the head portion 201. If the locking surface portion 102 of the cleaning sheet 100 can be easily locked to the head portion 201 and the attachment is easy, the cleaning sheet 100 can be properly attached to the head portion 201 of the cleaning tool 200 and floor cleaning can be performed effectively.

[0019] [(3-1) Joints and Non-Joints] The cleaning sheet 100 is composed of a joint where the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are joined in a manner in which they are attached to each other, and a non-joint where the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are laminated and not joined. The joint is the area where the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are attached so as to be partially integrated, and the area other than the joint is the non-joint. Examples of joints include embossing 20, which is an uneven surface formed by embossing the laminated hydrophobic nonwoven fabric layer 11, waterproof layer 13, and hydrophilic nonwoven fabric layer 12 by compressing them in the thickness direction, and bond points 30, which are areas where the laminated hydrophobic nonwoven fabric layer 11, waterproof layer 13, and hydrophilic nonwoven fabric layer 12 are partially heat-bonded with hot melt or the like. In this embodiment, embossing 20 is used as the joint in the locking surface portion 102 of the cleaning sheet 100, and bond points 30 are used as the joint in the cleaning surface portion 101 of the cleaning sheet 100.

[0020] [(3-2) Embossed Bond Point] The embossing 20 formed on the locking surface portion 102 of the cleaning sheet 100 includes a convex embossing 21 that protrudes toward one side of the sheet and a concave embossing 22 that protrudes toward the other side of the sheet (concave toward one side), and these are arranged alternately. Both the convex embossing 21 and the concave embossing 22 are formed to be approximately elliptical in shape in plan view, with a constriction approximately in the center along the long axis, forming a so-called gourd shape. In particular, it is preferable that the proportion of the embossing 20, which is the bonding portion on the locking surface portion 102, be 40% or more. If the proportion of embossing 20 on the locking surface portion 102 is 40% or more, the three layers of hydrophobic nonwoven fabric layer 11, waterproof layer 13, and hydrophilic nonwoven fabric layer 12 will not separate on the locking surface portion 102, and the locking surface portion 102 can be treated as a single sheet, so that the locking surface portion 102 can be suitably locked to a predetermined mounting location provided on the upper surface of the head portion 201. The pattern of embossing 20 is not limited to this and can be changed as appropriate, as long as it can suitably adhere the three layers of hydrophobic nonwoven fabric layer 11, waterproof layer 13, and hydrophilic nonwoven fabric layer 12 to each other. Alternatively, the embossing 20 may be replaced with bond points 30, and the three layers may be adhered so that the proportion of bond points 30 on the locking surface portion 102 is 40% or more.

[0021] The bond points 30 formed on the cleaning surface portion 101 of the cleaning sheet 100 are approximately square in plan view, and six bond points 30 are arranged in a staggered pattern. These bond points 30 are provided to prevent the three layers of hydrophobic nonwoven fabric layer 11, waterproof layer 13, and hydrophilic nonwoven fabric layer 12 from shifting during cleaning. The proportion of joints (bond points 30, embossing 20) on the cleaning surface portion 101 may be less than the proportion of joints (embossing 20, bond points 30) on the locking surface portion 102. For example, the proportion of joints on the cleaning surface portion 101 may be less than 40%. For example, in the case of a cleaning sheet 100 equipped with a bulky hydrophobic nonwoven fabric layer 11, when cleaning using the hydrophobic nonwoven fabric layer 11 as the cleaning surface, having fewer joints on the cleaning surface portion 101 makes it possible to suitably capture fine debris such as hair, fiber scraps, and dust. For example, the bulky hydrophobic nonwoven fabric layer 11 contains at least 25 g / m² ２ A nonwoven fabric having a basis weight of (gsm) and a thickness of at least 0.35 mm can be used. The pattern of the bond points 30 is not limited to this and can be changed as appropriate, as long as the three layers of the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are adhered together without shifting. Alternatively, the bond points 30 may be replaced with embossing 20 to adhere the three layers together.

[0022] [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.

[0023] [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.

[0024] [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.

[0025] [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.

[0026] [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.

[0027] [(4) 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.

[0028] [2. Explanation of Effects] According to the cleaning sheet 100 of this embodiment, floor cleaning can be performed by using either the hydrophobic nonwoven fabric layer 11, which is not impregnated with a chemical solution, or the hydrophilic nonwoven fabric layer 12, which is impregnated with a chemical solution. Specifically, if the cleaning sheet 100 is 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, the cleaning sheet 100 can be used as a dry-type cleaning sheet, making it possible to clean by capturing fine debris such as hair, lint, and dust. Alternatively, if the cleaning sheet 100 is 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, the cleaning sheet 100 can be used as a wet-type cleaning sheet, making it possible to effectively wipe away food spills and sebum stains that are stuck to the floor.

[0029] In other words, by using both sides of the cleaning sheet 100, it becomes possible to perform cleaning that simultaneously collects dust and wipes away dirt. For example, after cleaning by collecting dust using the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100 as the cleaning surface, the cleaning sheet 100 attached to the head unit 201 can be switched to use the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 as the cleaning surface to wipe away dirt from the floor. In this way, by using both sides of a single cleaning sheet 100, it is possible to perform cleaning that simultaneously collects dust and wipes away dirt.

[0030] In particular, because a waterproof layer 13 is interposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, the chemical solution impregnated in the hydrophilic nonwoven fabric layer 12 does not seep out to the hydrophobic nonwoven fabric layer 11. As a result, the hydrophilic nonwoven fabric layer 12 remains wet and the hydrophobic nonwoven fabric layer 11 remains dry, allowing for effective cleaning by using both sides of the cleaning sheet 100.

[0031] Next, the results of the evaluation of embodiments of the present invention will be described. The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0032] <Sample Preparation> The cleaning sheet 100 used in the following tests was manufactured by laminating a hydrophobic nonwoven fabric layer 11 with a fiber composition of PE / PP = 100% and a basis weight of 35 gsm, a waterproof layer 13 which is a polyethylene film of 25 gsm, and a hydrophilic nonwoven fabric layer 12 with a fiber composition of rayon / PET / PP / PE = 40 / 20 / 20 and a basis weight of 34 gsm, and joining the three layers together so that they do not separate. This three-layer sample was designated as Example 1.

[0033] Furthermore, as a sample of Comparative Example 1 of the cleaning sheet used in the following tests, a hydrophobic nonwoven fabric layer 11 with a fiber composition of PE / PP = 100% and a basis weight of 35 gsm as a nonwoven fabric, and a hydrophilic nonwoven fabric layer 12 with a fiber composition of rayon / PET / PP / PE = 40 / 20 / 20 and a basis weight of 34 gsm as a nonwoven fabric were laminated and joined together in a way that prevented the two layers from separating. In other words, the sample of Comparative Example 1 does not have a waterproof layer 13, and the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12 are in contact with each other.

[0034] Furthermore, the hydrophilic nonwoven fabric layer 12 of the sample in Example 1 and the hydrophilic nonwoven fabric layer 12 of the sample in Comparative Example 1 were impregnated with purified water at an impregnation rate of 300% as a substitute for the chemical solution.

[0035] Furthermore, we used a dry sheet of our marketed product as Comparative Example 2, and a wet sheet of our marketed product as Comparative Example 3. In other words, we prepared four cleaning sheet samples—Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3—and conducted the following tests. The chemical impregnation rate of the wet sheet in Comparative Example 3 was 300%.

[0036] <Moisture leaching test from the dry surface (hydrophobic nonwoven fabric layer 11)> Step 1: Cut the sample from Example 1 and the sample from Comparative Example 1 into 10 cm squares and measure their weights. Step 2: Impregnate each sample with purified water to a concentration of 300% by weight relative to the hydrophilic nonwoven fabric layer 12, and measure its weight. This will be used as the specimen. Step 3: Place the specimen with the dry surface (hydrophobic nonwoven fabric layer 11) facing down on eight layers of filter paper. (At this time, the filter paper and the dry surface are in contact.) ADVANTEC qualitative filter paper No. 2 150 mm x 150 mm was used as the filter paper. Step 4: Place a 500 g weight of the same size as the specimen (10 cm square) on top of the specimen (on the hydrophilic nonwoven fabric layer 12 side) and leave it for 10 seconds. After 10 seconds, remove the weight and measure the weight of the specimen. Step 5: Steps 3 and 4 were repeated five times, and the ratio of the amount of water absorbed by the filter paper to the amount of purified water impregnated in step 2 was calculated and defined as the leaching amount. This test was performed five times and the average value was calculated.

[0037] The results of this moisture leaching test showed that the leaching amount of the sample in Example 1 was 1-5%, and the leaching amount of the sample in Comparative Example 1 was 6-15%. Furthermore, considering the purified water adhering to the weight and the purified water that evaporated during the process of repeating steps 3 and 4 in this test, it was considered that the leaching amount of the sample in Example 1 was approximately 0%, and the leaching amount of the sample in Comparative Example 1 was approximately 10%. Thus, it was confirmed that in the sample of Example 1, the waterproof layer 13 placed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12 prevented the purified water impregnated in the hydrophilic nonwoven fabric layer 12 from seeping out to the hydrophobic nonwoven fabric layer 11.

[0038] <Debris Collection Test> A 25 cm x 100 cm frame was set up on the top surface of a plywood wooden flooring material, and several strands of hair were placed inside the frame. Here, five strands of hair were placed along the longitudinal direction of the frame, and five strands of hair were placed approximately perpendicular to the longitudinal direction. The strands of hair used were approximately 10 cm in length. A sample of a cleaning sheet was set at the longitudinal end of the frame, and the sample was moved back and forth once along the longitudinal direction of the frame, rubbing the top surface of the wooden flooring material with the sample, and the number of strands of hair collected by the sample was counted. Here, a sample of a cleaning sheet was attached to the head of a cleaning tool (floor wiper), and a 500 g weight was attached to the head, with the longitudinal edge of the head positioned approximately perpendicular to the longitudinal direction of the frame, and the sample was moved back and forth once within the frame. In this debris collection test, the samples of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 were used. In Example 1, the samples were tested by rubbing the wooden flooring material with the dry side (hydrophobic nonwoven fabric layer 11) and the wet side (hydrophilic nonwoven fabric layer 12). This dust collection test was performed five times for each sample, and the average value was calculated. The dust collection performance of each sample was evaluated using the following four-level scale: "Excellent": 10 to 9.1 pieces "Good": 9.0 to 8.1 pieces "Acceptable": 8.0 to 7.1 pieces "Poor": 7.0 pieces or less

[0039] The results of this debris collection test are shown below. Example 1 Dry side: "Excellent" Example 1 Wet side: "Fair" Comparative Example 1 Dry side: "Good" Comparative Example 2 (Dry sheet): "Excellent" Comparative Example 3 (Wet sheet): "Poor" Thus, it was confirmed that the dry type sheet has superior performance in collecting hair debris. Note that the dry side of Comparative Example 1 (hydrophobic nonwoven fabric layer 11) is a semi-dry side due to water seepage from the wet side (hydrophilic nonwoven fabric layer 12), and therefore its debris collection performance is slightly inferior to that of the dry side of Example 1.

[0040] <Dirt Wiping Test> 0.5 cc of café au lait (manufactured by Ezaki Glico Co., Ltd.; Mild Café au Lait) was dropped into two locations in the center of a 320 mm long polypropylene plate, and the resulting attached dirt was dried at 60°C for 1 hour. A sample of the cleaning sheet was placed on the right end of the polypropylene plate, and a rubber plate was placed on top of the sample. Three polypropylene plates with café au lait stains were prepared. The first polypropylene plate was set up so that the dirt was wiped off with the wet side (hydrophilic nonwoven fabric layer 12) of the sample from Example 1, the second polypropylene plate was set up so that the dirt was wiped off with the wet side (hydrophilic nonwoven fabric layer 12) of the sample from Comparative Example 1, and the third polypropylene plate was set up so that the dirt was wiped off with the wet sheet from Comparative Example 3. Then, the cleaning sheet sample with the rubber plate on top was moved to the left end of the polypropylene plate over approximately 4 seconds, and then moved from the left end to the right end of the polypropylene plate over approximately 4 seconds. This back-and-forth motion was repeated multiple times, and the state of soiling was observed after each pass. The soiling test evaluated the soiling performance of each sample using the following four-level scale: "Excellent": The soiling could be wiped away in 5 passes or less. "Good": The soiling could be wiped away in 6 to 8 passes. "Acceptable": The soiling could be wiped away in 9 to 10 passes. "Poor": The soiling could be wiped away in 11 or more passes.

[0041] The results of this dirt-wiping test are shown below. Example 1 (wet surface): "Good" Comparative Example 1 (wet surface): "Good" Comparative Example 3 (wet sheet): "Good" Thus, the dirt-wiping performance was equivalent for all wet-type sheets.

[0042] <Test Results> From the results of the above-described dust collection test and dirt wiping test, it was confirmed that for the cleaning sheet 100 (sample of Example 1) of the present embodiment, the surface on the hydrophobic nonwoven fabric layer 11 side (dry surface) has good dust collection performance, and the surface on the hydrophilic nonwoven fabric layer 12 side (wet surface) has good dirt wiping performance. That is, for the cleaning sheet 100 of the present embodiment, by properly using one surface (the surface on the hydrophobic nonwoven fabric layer 11 side) and the other surface (the surface on the hydrophilic nonwoven fabric layer 12 side) of one cleaning sheet 100, it is possible to perform cleaning that combines dust collection and dirt wiping. In particular, in the cleaning sheet 100 of the present embodiment, since the waterproof layer 13 is disposed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, it is possible to maintain the hydrophobic nonwoven fabric layer 11 side as the dry surface and the hydrophilic nonwoven fabric layer 12 side as the wet surface, so that cleaning using them properly can be performed.

[0043] The present invention is not limited to the above-described embodiment. As shown in FIGS. 5 and 6, the cleaning sheet 100 of the present embodiment 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 laminated and joined. The hydrophobic nonwoven fabric layer 11 is joined to one surface side of the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 is joined to the other surface side of the waterproof layer 13, and the waterproof layer 13 is provided with a mark for making it possible to distinguish one surface from the other surface. For example, as shown in FIG. 5, a mark of "DRY" is provided by printing on one surface side of the waterproof layer 13 to which the hydrophobic nonwoven fabric layer 11 is joined. Also, as shown in FIG. 6, a mark of "WET" is provided by printing on the other surface side of the waterproof layer 13 to which the hydrophilic nonwoven fabric layer 12 is joined. The mark of "DRY" provided on one surface side of the waterproof layer 13 is visible through the hydrophobic nonwoven fabric layer 11 (see FIG. 5). Similarly, the mark of "WET" provided on the other surface side of the waterproof layer 13 is visible through the hydrophilic nonwoven fabric layer 12 (see FIG. 6).

[0044] In this way, since the marks ("DRY" and "WET") printed and provided on the waterproof layer 13 of the cleaning sheet 100 are configured to be visible, the user can easily distinguish between the surface on the hydrophobic non-woven fabric layer 11 side and the surface on the hydrophilic non-woven fabric layer 12 side of the cleaning sheet 100. In such a manner, if the surface on the hydrophobic non-woven fabric layer 11 side and the surface on the hydrophilic non-woven fabric layer 12 side of the cleaning sheet 100 can be visually distinguished, the user can appropriately attach the cleaning sheet 100 to the head portion 201 of the cleaning tool 200 according to whether collecting fine dust on the floor surface or wiping off dirt stuck to the floor surface, and use the surface on the hydrophobic non-woven fabric layer 11 side and the surface on the hydrophilic non-woven fabric layer 12 side separately.

[0045] Note that the printing of the marks on both sides of the waterproof layer 13 is not limited to printing "DRY" on one side of the waterproof layer 13 and printing "WET" on the other side of the waterproof layer 13. It may also be possible to print only "DRY" on one side of the waterproof layer 13 or only "WET" on the other side of the waterproof layer 13. Even in the mode where the mark is provided on one side of the waterproof layer 13, it is possible to distinguish between the surface on the hydrophobic non-woven fabric layer 11 side and the surface on the hydrophilic non-woven fabric layer 12 side.

[0046] Further, the emboss pattern formed on the locking surface portion 102 of the cleaning sheet 100 shown in FIGS. 5 and 6 has an emboss block of a diamond shape in which embosses 20 including convex embosses 21 and concave embosses 22 are arranged obliquely, and a non-emboss portion 40 between the emboss blocks. The non-emboss portion 40 is not compressed in the thickness direction compared to the portion where the emboss 20 is formed and is a portion having fluff. Even with such an emboss 20 of a pattern, the three layers of the hydrophobic non-woven fabric layer 11, the waterproof layer 13, and the hydrophilic non-woven fabric layer 12 can be suitably adhered. As described above, it is preferable that the ratio of the emboss 20 (joint portion) in the locking surface portion 102 is 40% or more.

[0047] As described above, with the cleaning sheet 100 of this embodiment, one side of a single cleaning sheet 100 (the side with the hydrophobic nonwoven fabric layer 11) and the other side (the side with the hydrophilic nonwoven fabric layer 12) can be used interchangeably to perform cleaning that simultaneously collects dust and wipes away dirt.

[0048] In the embodiments described above, the cleaning sheet 100 is shown attached to the cleaning tool 200 (head portion 201) for cleaning. However, the present invention is not limited to this, and cleaning may be performed by wiping with the cleaning sheet 100 held in the hand without using the cleaning tool 200.

[0049] Furthermore, while the above embodiments illustrate a configuration in which the waterproof layer 13 has markings printed on it to distinguish between one side and the other, the present invention is not limited thereto. For example, the entire surface of the waterproof layer 13 may be printed with decorative patterns such as floral or checkered patterns to create a highly decorative cleaning sheet 100. Alternatively, the other side of the waterproof layer 13 may be printed with patterns reminiscent of water, such as polka dots or waves, to make it visible that this is the side facing the hydrophilic nonwoven fabric layer 12 (the wet side).

[0050] Furthermore, in the above embodiments, the hydrophilic nonwoven fabric layer 12 is impregnated with the chemical solution, while the hydrophobic nonwoven fabric layer 11 is not. However, the present invention is not limited thereto. For example, the hydrophilic nonwoven fabric layer 12 may be impregnated with the chemical solution at a high impregnation rate, while the hydrophobic nonwoven fabric layer 11 may be impregnated with the chemical solution at a low impregnation rate. In this case, the presence of a waterproof layer 13 between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12 prevents the chemical solution from moving between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12. This is preferable because it allows for the maintenance of a high impregnation rate of the chemical solution on the hydrophilic nonwoven fabric layer 12 side and a low impregnation rate of the chemical solution on the hydrophobic nonwoven fabric layer 11 side. In the case of the cleaning wet sheet described in Patent Document 1, since the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer are in contact, the chemical solution may move from the hydrophilic nonwoven fabric layer side to the hydrophobic nonwoven fabric layer side, making it impossible to maintain the desired impregnation rate of the chemical solution.

[0051] Furthermore, it goes without saying that other specific structural details can be modified as needed.

[0052] Since the present invention is configured as described above, it can be used as a cleaning sheet.

[0053] 11 Hydrophobic nonwoven fabric layer 12 Hydrophilic nonwoven fabric layer 13 Waterproof layer 20 Embossing (joint) 30 Bond point (joint) 100 Cleaning sheet 101 Cleaning surface 102 Locking surface S Fold line 200 Cleaning tool 201 Head part 202 Handle part

Claims

A hydrophobic nonwoven fabric layer containing at least hydrophobic fibers, A hydrophilic nonwoven fabric layer containing at least hydrophilic fibers, and having a higher proportion of hydrophilic fibers than the hydrophobic nonwoven fabric layer, A waterproof layer is disposed between the hydrophobic nonwoven fabric layer and the hydrophilic nonwoven fabric layer, Equipped with, A cleaning sheet comprising the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer, laminated and joined together, A cleaning sheet characterized in that the hydrophilic nonwoven fabric layer is impregnated with a chemical solution. 　 The hydrophobic nonwoven fabric layer is bonded to one side of the waterproof layer, and the hydrophilic nonwoven fabric layer is bonded to the other side of the waterproof layer. The cleaning sheet according to claim 1, characterized in that the waterproof layer is provided with markings to enable identification of one surface and the other surface. 　 The cleaning sheet according to claim 2, characterized in that the mark provided on one side of the waterproof layer is made visible by passing through the hydrophobic nonwoven fabric layer, and the mark provided on the other side of the waterproof layer is made visible by passing through the hydrophilic nonwoven fabric layer. 　 The cleaning sheet is used by being attached to the head of a cleaning tool. A cleaning surface portion is arranged to cover the bottom surface of the head portion, The locking surfaces are located on both sides of the cleaning surface and are bent and locked to the upper surface of the head portion, It has, The cleaning sheet according to any one of claims 1 to 3, characterized in that at least the locking surface portion is bonded together with the hydrophobic nonwoven fabric layer and the waterproof layer. 　 The cleaning sheet in question is, A joint portion in which the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer are joined in a manner in which they are attached to each other, In a configuration in which the hydrophobic nonwoven fabric layer, the waterproof layer, and the hydrophilic nonwoven fabric layer are laminated, there are non-jointed portions that are not joined together. It is composed of having, The cleaning sheet according to claim 4, characterized in that the proportion of the joint portion in the locking surface portion is 40% or more.

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