Cleaning sheet

Abstract

We have created a cleaning sheet that enables cleaning by simultaneously wiping away dirt and collecting debris. [Solution] A cleaning sheet 100 comprises a hydrophobic nonwoven fabric layer 11 containing at least hydrophobic fibers, a hydrophilic nonwoven fabric layer 12 containing at least hydrophilic fibers with a higher proportion of hydrophilic fibers than the hydrophobic nonwoven fabric layer, and a waterproof 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 waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are laminated and joined together, and the hydrophilic nonwoven fabric layer 12 is impregnated with a chemical solution. In this way, by using the front and back sides of the cleaning sheet 100, it is possible to suitably wipe away dirt from the floor surface with the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100, and suitably collect debris from the floor surface with the hydrophobic nonwoven fabric layer 11 side of the cleaning sheet 100.

Description

Technical Field

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

Background Art

[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.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[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 satisfactorily wipe off stuck food spills, sebum stains, etc. on the floor, it may not be possible to completely collect fine dust such as hair, fiber debris, and dust. Thus, in the case of a wet type cleaning sheet, there are times when it is inferior in performance to collect fine dust compared to a dry type cleaning sheet, but there is a non-negligible 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.

Means for Solving the Problems

[0006] To solve the above problems, the invention described in claim 1 is: 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 non-permeable 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, The hydrophilic nonwoven fabric layer is characterized by being impregnated with a chemical solution.

[0007] The invention described in claim 2 is a cleaning sheet described in claim 1, 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 waterproof layer is characterized by having markings that allow one surface to be distinguished from the other surface.

[0008] The invention described in claim 3 is a cleaning sheet described in claim 2, The marker provided on one side of the waterproof layer is configured to be visible through the hydrophobic nonwoven fabric layer, and the marker provided on the other side of the waterproof layer is configured to be visible through the hydrophilic nonwoven fabric layer.

[0009] The invention described in claim 4 relates to a cleaning sheet according to any one of claims 1 to 3, 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 side of the head portion, It has, At least in the locking surface portion, the hydrophobic non-woven fabric layer, the waterproof layer, and the hydrophilic non-woven fabric layer are joined together.

[0010] The invention according to claim 5 is the cleaning sheet according to claim 4, wherein the cleaning sheet a joint portion where the hydrophobic non-woven fabric layer, the waterproof layer, and the hydrophilic non-woven fabric layer are joined in a manner of being attached to each other, a non-joint portion where the hydrophobic non-woven fabric layer, the waterproof layer, and the hydrophilic non-woven fabric layer are not joined in a manner of being laminated, and is configured to have the ratio of the joint portion in the locking surface portion is 40% or more.

Effect of the Invention

[0011] According to the present invention, a cleaning sheet capable of achieving both wiping off dirt and collecting dust can be obtained.

Brief Description of the Drawings

[0012] [Figure 1] It is a plan view showing the cleaning sheet of the present embodiment. [Figure 2] It is an explanatory view showing that the cleaning sheet of the present embodiment has a three-layer structure. [Figure 3] It is a schematic cross-sectional view of the cleaning sheet of the present embodiment. [Figure 4] It is a perspective view showing a cleaning tool to which the cleaning sheet of the present embodiment is attached. [Figure 5] It is a modified example of the cleaning sheet, and is an explanatory view regarding a mark (DRY) provided on one surface side, showing a part of the hydrophobic non-woven fabric layer broken. [Figure 6] It is a modified example of the cleaning sheet, and is an explanatory view regarding a mark (WET) provided on the other surface side, showing a part of the hydrophilic non-woven fabric layer broken.

Mode for Carrying Out the Invention

[0013] Hereinafter, referring to the drawings, the cleaning sheet 100 according to an embodiment of the present invention will be described. However, the technical scope of the present invention is not limited to the illustrated examples, and is determined based on the description in the claims In the following, as shown in FIG. 4, the front-rear, left-right, up-down, X-direction, Y-direction, and Z-direction are defined. In this specification, "~" is used to mean including the numerical values described before and after it as the lower limit value and the upper limit value.

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

[0015] [(1) Cleaning sheet] The cleaning sheet 100 of the present embodiment includes, for example, as shown in FIGS. 1 to 3, 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, and is a three-layer structure sheet formed by bonding the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 in a laminated state. The hydrophilic nonwoven fabric layer 12 of this cleaning sheet 100 is impregnated with a chemical solution. And, by disposing the waterproof layer 13 between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, it prevents the chemical solution impregnated in the hydrophilic nonwoven fabric layer 12 from bleeding out to the hydrophobic nonwoven fabric layer 11 side.

[0016] [(2) State during use] As shown in FIG. 4, the cleaning sheet 100 is, for example, a sheet that is detachably attached to a cleaning tool 200 having a rectangular flat plate-shaped head portion 201 and a handle portion 202 attached to the upper surface of the head portion 201 and is used for floor cleaning. This cleaning sheet 100 is attached to the head portion 201 of the cleaning tool 200 and used.

[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, and is folded along the fold line S along the longitudinal edge 201a of the head portion 201 and secured to the upper surface of the head portion 201, thus becoming 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. In other words, 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. Furthermore, the boundary line S between the cleaning surface 101 and the locking surface 102 is not limited to being the fold line S; the fold line S may be on the cleaning surface 101 side or on the locking surface 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, and 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 cleaning sheet 100—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, 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) Jointed / non-joined parts] The cleaning sheet 100 is constructed with a joint portion in which a hydrophobic nonwoven fabric layer 11, a waterproof layer 13, and a hydrophilic nonwoven fabric layer 12 are joined in a manner in which they are attached to each other, and an unjoint portion in which the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are laminated and not joined. A joint is a portion where the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12 are partially bonded together, and the portions other than the joint are non-jointed portions. Examples of joints include embossing 20, which is a raised or recessed area 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 adhesive or the like. In this embodiment, an embossed surface 20 is used as the joint portion at the locking surface portion 102 of the cleaning sheet 100, and a bond point 30 is used as the joint portion at 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 in an alternating pattern. Both the convex embossing 21 and the concave embossing 22 are formed to be roughly elliptical in shape when viewed from above, with a constriction approximately in the center along the major axis, resulting in a so-called gourd shape. In particular, it is preferable that the proportion of the embossed area 20, which is the joint portion in 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 the embossing 20 is not limited to this, and can be changed as appropriate, as long as it allows for suitable adhesion of the three layers: the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12. Alternatively, the embossing 20 may be replaced with bond points 30, and the three layers may be adhered such 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 shape when viewed from above, and six bond points 30 are arranged in a staggered pattern. This bond point 30 is provided to prevent the three layers—the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12—from shifting during cleaning. The proportion of joints (bond points 30, embossing 20) in the cleaning surface portion 101 may be less than the proportion of joints (embossing 20, bond points 30) in the locking surface portion 102. For example, the proportion of joints in 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 in 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 it ensures that the three layers—the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12—are bonded together without shifting. Alternatively, the bond points 30 may be replaced with the embossing 20 to bond the three layers together.

[0022] [a Hydrophilic fiber] 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 made 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 the low-melting point resin and the high-melting point resin are arranged in parallel in a predetermined direction.

[0024] [c Hydrophilic nonwoven fabric layer] The hydrophilic nonwoven fabric 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 fabric layer 12 is a nonwoven fabric containing at least hydrophilic fibers. This hydrophilic nonwoven fabric layer 12 has a higher proportion of hydrophilic fibers than the hydrophobic nonwoven fabric layer 11. Since the hydrophilic nonwoven fabric 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 hydrophilic fiber content in the hydrophilic nonwoven fabric layer 12 is 40% or more, and the hydrophobic fiber content is 60% or less. By increasing the proportion of hydrophilic fibers in the hydrophilic nonwoven fabric layer 12 to 40% or more, the liquid retention (water retention) when the hydrophilic nonwoven fabric layer 12 is impregnated with a chemical solution can be improved. 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 20-100 g / m². 2 (gsm) is preferred. Basis weight refers to the basis weight measured in accordance with JIS P8124:2011.

[0025] [d Hydrophobic nonwoven fabric layer] The hydrophobic nonwoven fabric layer 11 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 hydrophobic nonwoven fabric layer 11 is a nonwoven fabric containing at least hydrophobic fibers. The hydrophobic fibers used in the hydrophobic nonwoven fabric layer 11 are preferably of a thicker diameter, for example, 5.0 to 7.8 dtex. This hydrophobic nonwoven fabric layer 11 has a lower proportion of hydrophilic fibers than the hydrophilic nonwoven fabric layer 12. Since the hydrophobic nonwoven fabric layer 11 is not impregnated with the chemical solution, the proportion of hydrophilic fibers is kept low. For example, it is preferable that the proportion of hydrophilic fibers in the hydrophobic nonwoven fabric layer 11 is less than 40%, and the proportion of hydrophobic fibers exceeds 60%. Furthermore, the hydrophobic nonwoven fabric layer 11 does not necessarily need to contain hydrophilic fibers. In this embodiment, a hydrophobic nonwoven fabric layer 11 having a hydrophobic fiber content of 100% is used. Furthermore, the hydrophobic nonwoven fabric layer 11, which is not impregnated with the chemical solution, can be suitably used for dry wiping. The basis weight of the hydrophobic nonwoven fabric layer 11 is 20-60 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 waterproofing sheet, a film made by molding resins such as polyethylene (PE), polypropylene (PP), and 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, preventing the chemical solution impregnated in the hydrophilic nonwoven fabric layer 12 from seeping out onto the hydrophobic nonwoven fabric layer 11. In other words, a wet, hydrophilic nonwoven fabric layer 12 and a dry, hydrophobic nonwoven fabric layer 11 are arranged 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. The components and properties of the chemical solution are not limited to those specified 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 a hydrophobic nonwoven fabric layer 11 that is not impregnated with a chemical solution and a hydrophilic nonwoven fabric layer 12 that is impregnated with a chemical solution. Specifically, by attaching the cleaning sheet 100 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. Furthermore, 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 used as a wet-type cleaning sheet, making it possible to effectively wipe away food spills, sebum stains, and other dirt 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 with 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 face the other side, allowing the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100 to be used 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. [Examples]

[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] <Create a sample> The cleaning sheet 100 used in the following tests is manufactured by laminating a hydrophobic nonwoven fabric layer 11 with a fiber composition of PE·PP=100% and a basis weight of 35gsm, a waterproof layer 13 which is a polyethylene film of 25gsm, and a hydrophilic nonwoven fabric layer 12 with a fiber composition of rayon / PET / PP·PE=40 / 20 / 20 and a basis weight of 34gsm, and joining the three layers in a way that prevents them from separating. This three-layered 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 35gsm 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 34gsm as a nonwoven fabric were laminated and joined together in a manner that prevented the two layers from separating. In other words, the sample in 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, four cleaning sheet samples—Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3—were prepared, and the following tests were conducted. The drug impregnation rate of the wet wipe 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 10cm squares and measure their weights. Step 2: Each sample is impregnated with purified water to a concentration of 300% by weight of the hydrophilic nonwoven fabric layer 12, and its weight is measured. This is the sample. Step 3: Place the sample on top of the eight-sheet stack of filter paper, with the dry side (hydrophobic nonwoven fabric layer 11) facing downwards. (At this time, the filter paper and the dry side are in contact.) ADVANTEC Qualitative Filter Paper No. 2 150mm x 150mm was used as the filter paper. Step 4: Place a 500g weight of the same size as the sample (10cm square) on top of the sample (on the side with the hydrophilic nonwoven fabric layer 12) and leave it for 10 seconds. After 10 seconds, remove the weight and measure the weight of the sample. 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 water leaching test showed that the leaching amount of the sample in Example 1 was 1-5%, while 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 concluded 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, in the sample of Example 1, it was confirmed that the waterproof layer 13, which is placed between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, prevents the purified water impregnated in the hydrophilic nonwoven fabric layer 12 from seeping out to the hydrophobic nonwoven fabric layer 11.

[0038] <Garbage collection test> A 25cm x 100cm frame was created on the top surface of a plywood wooden flooring material, and several strands of hair were placed within that frame. Here, five strands of hair were placed along the long side of the frame, and five strands of hair were placed approximately perpendicular to the long side. The hair used was approximately 10 cm in length. A sample of the cleaning sheet was placed at the long end of the frame, and the sample was moved back and forth along the long side of the frame, rubbing the top surface of the wooden flooring material. The number of hairs collected by the sample was then counted. In this experiment, a sample of a cleaning sheet was attached to the head of a cleaning tool (floor wiper), and a 500g weight was attached to the head. The long edge of the head was positioned approximately perpendicular to the long direction of the frame, and the sample was moved back and forth once within the frame. In this waste collection test, samples from Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 were used. In the sample of Example 1, tests were conducted by rubbing the wooden flooring material with the dry side (hydrophobic nonwoven fabric layer 11) and with the wet side (hydrophilic nonwoven fabric layer 12). This waste collection test was performed five times for each sample, and the average value was calculated. The waste collection test evaluated the waste collection performance of each sample using the following four-level evaluation system. "Excellent" ; 10-9.1 pieces "Good"; 9.0-8.1 pieces "Acceptable" ;8.0~7.1 books "Not possible"; 7.0 or less

[0039] The results of this waste collection test are shown below. Dry surface of Example 1: "Excellent" Wet surface of Example 1: "Acceptable" Comparison Example 1 (Dry Surface): "Good" Comparative Example 2 (Dry Sheet): "Excellent" Comparative Example 3 (Wet Wipes): "Not acceptable" Thus, it was confirmed that the dry type of sheet is superior in its ability to capture hair and other debris. In Comparative Example 1, the dry surface (hydrophobic nonwoven fabric layer 11) is semi-dry due to water seepage from the wet surface (hydrophilic nonwoven fabric layer 12), resulting in slightly inferior dust collection performance compared to the dry surface of Example 1.

[0040] <Dirt removal test> 0.5cc of café au lait (manufactured by Ezaki Glico Co., Ltd.; Mild Café Au Lait) was dropped into two locations in the center of a 320mm long polypropylene plate, and the resulting residue was dried at 60°C for 1 hour to adjust the level of attached dirt. Place a sample of the cleaning sheet on the right edge of the polypropylene board, and then place the rubber sheet on top of the sample. Here, three polypropylene boards with café au lait stains were prepared. The first polypropylene board was set up so that the stains were wiped off with the wet side (hydrophilic nonwoven fabric layer 12) of the sample from Example 1. The second polypropylene board was set up so that the stains were wiped off with the wet side (hydrophilic nonwoven fabric layer 12) of the sample from Comparative Example 1. The third polypropylene board was set up so that the stains were wiped off with the wet sheet from Comparative Example 3. Then, the cleaning sheet sample with the rubber plate on it is moved to the left edge of the polypropylene plate over approximately 4 seconds, and then moved from the left edge to the right edge of the polypropylene plate over approximately 4 seconds. This back-and-forth process was repeated multiple times, and the degree of soiling was observed after each round trip. The dirt-wiping test evaluated the dirt-wiping performance of each sample using the following four-level rating system. "Excellent"; The dirt could be wiped away within 5 passes. "Good"; I was able to wipe away the dirt in 6-8 passes. "Acceptable"; the dirt could be wiped away in 9-10 back-and-forth strokes. "Not possible"; the dirt could not be wiped away with more than 11 passes.

[0041] The results of this stain removal test are shown below. Wet surface of Example 1: "Good" Wet surface of Comparative Example 1: "Good" Comparative Example 3 (Wet Wipes): "Good" Thus, the cleaning performance of wet-type wipes was comparable.

[0042] <Test Results> From the results of the dust collection test and dirt wiping test described above, it was confirmed that the cleaning sheet 100 of this embodiment (sample of Example 1) has good dust collection performance on the side with the hydrophobic nonwoven fabric layer 11 (dry side) and good dirt wiping performance on the side with the hydrophilic nonwoven fabric layer 12 (wet side). In other words, 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. In particular, since the cleaning sheet 100 of this embodiment has a waterproof layer 13 between the hydrophobic nonwoven fabric layer 11 and the hydrophilic nonwoven fabric layer 12, the hydrophobic nonwoven fabric layer 11 side can be kept as a dry surface and the hydrophilic nonwoven fabric layer 12 side can be kept as a wet surface, allowing for effective cleaning by utilizing both sides.

[0043] However, the present invention is not limited to the embodiments described above. As shown in Figures 5 and 6, the cleaning sheet 100 of this embodiment has a three-layer structure in which a hydrophobic nonwoven fabric layer 11, a waterproof layer 13, and a hydrophilic nonwoven fabric layer 12 are laminated and joined together. Furthermore, a hydrophobic nonwoven fabric layer 11 is bonded to one side of the waterproof layer 13, and a hydrophilic nonwoven fabric layer 12 is bonded to the other side of the waterproof layer 13, and the waterproof layer 13 is provided with markings to distinguish between the two sides. For example, as shown in Figure 5, the waterproof layer 13 to which the hydrophobic nonwoven fabric layer 11 is bonded has the mark "DRY" printed on one side. Furthermore, as shown in Figure 6, the other side of the waterproof layer 13 to which the hydrophilic nonwoven fabric layer 12 is bonded is marked with the word "WET" printed on it. Furthermore, the "DRY" marking on one side of the waterproof layer 13 is visible through the hydrophobic nonwoven fabric layer 11 (see Figure 5). Similarly, the "WET" marking on the other side of the waterproof layer 13 is visible through the hydrophilic nonwoven fabric layer 12 (see Figure 6).

[0044] In this way, the markings ("DRY" and "WET") printed on the waterproof layer 13 of the cleaning sheet 100 are made visible, allowing the user to easily distinguish between the hydrophobic nonwoven fabric layer 11 side and the hydrophilic nonwoven fabric layer 12 side of the cleaning sheet 100. In this manner, if the side of the cleaning sheet 100 facing the hydrophobic nonwoven fabric layer 11 and the side facing the hydrophilic nonwoven fabric layer 12 can be visually distinguished, the user can appropriately attach the cleaning sheet 100 to the head portion 201 of the cleaning tool 200 so as to use the side facing the hydrophobic nonwoven fabric layer 11 and the side facing the hydrophilic nonwoven fabric layer 12 depending on whether they are collecting fine dust that has fallen on the floor or wiping away dirt that has stuck to the floor.

[0045] Furthermore, it is not limited to printing the markings on both sides of the waterproof layer 13, such as printing "DRY" on one side and "WET" on the other side; it is also acceptable to print "DRY" on only one side of the waterproof layer 13, or to print "WET" on only the other side of the waterproof layer 13. Even in a configuration where a mark is provided on one side of the waterproof layer 13, it is possible to distinguish between the side facing the hydrophobic nonwoven fabric layer 11 and the side facing the hydrophilic nonwoven fabric layer 12.

[0046] Furthermore, the embossed pattern formed on the locking surface portion 102 of the cleaning sheet 100 shown in Figures 5 and 6 has a rhombus-shaped embossed block in which embossing 20, including convex embossing 21 and concave embossing 22, are arranged diagonally, and a non-embossed portion 40 between the embossed block. The non-embossed portion 40 is a portion that is not compressed in the thickness direction compared to the portion on which the embossing 20 is formed, and has a napped surface. Even with an embossed pattern like this 20, the three layers—the hydrophobic nonwoven fabric layer 11, the waterproof layer 13, and the hydrophilic nonwoven fabric layer 12—can be suitably bonded together. As mentioned above, it is preferable that the proportion of the embossing 20 (joint portion) on 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, in the embodiments described above, an example was given in which the waterproof layer 13 has markings printed on it to distinguish one side from the other, but 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 designs to create a highly decorative cleaning sheet 100. Furthermore, by printing patterns that evoke water, such as polka dots or waves, on the other side of the waterproof layer 13, it may be possible to make it visible that this is the side facing the hydrophilic nonwoven fabric layer 12 (the wet side).

[0050] Furthermore, in the embodiments described above, 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 two layers. 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 wipes 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, and it may not be possible 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. [Explanation of symbols]

[0052] 11 Hydrophobic nonwoven fabric layer 12 Hydrophilic nonwoven layer 13 Waterproof layer 20 Embossing (joint) 30 Bond points (joints) 100 Cleaning Sheets 101 Cleaning surface section 102 Locking surface part S fold line 200 cleaning tools 201 Head section 202 Handle

Claims

1. 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.

2. 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.

3. 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.

4. 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 side 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.

5. 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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