Cleaning sheet

Abstract

To provide a cleaning sheet that can achieve both scraping performance of dust and wiping-off performance of the entire cleaning surface while suppressing twist of the cleaning sheet.SOLUTION: A cleaning sheet (1) is used by being attached to a cleaning tool having a cleaning surface facing a cleaning object. The cleaning sheet has: a sheet center part (R1) disposed on the cleaning surface; and a sheet side part (R2) provided in the outside in a second direction (W) sandwiching the sheet center part. The cleaning sheet has: a first surface (11); a second surface (12) positioned at an opposite side to the first surface; compression regions (R50) positioned in both ends in the second direction of the cleaning sheet and having compression parts (50) formed therein; and a non-compression region (R55) positioned between the compression regions in the second direction. An outer end in the second direction of the sheet center part is positioned within the compression region. The compression region has: a first compression region (R51) adjacent to the non-compression region; and a second compression region (R52) positioned in the outside in the second direction from the first compression region, and having an area ratio of the compression part higher than that of the first compression region.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a cleaning sheet that is attached to a cleaning tool having a cleaning surface that faces an object to be cleaned.

[0002] Patent Documents 1 and 2 disclose cleaning sheets that are attached to a cleaning tool having a cleaning surface facing a cleaning target. The cleaning sheet of Patent Document 1 has recesses formed by embossing. The cleaning sheet of Patent Document 2 has multiple sheet layers, and the sheet layers are joined together by heat embossed parts and joints. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-198066 A [Patent Document 2] JP 2012-100950 A Summary of the Invention

[0004] The cleaning sheets of Patent Document 1 and Patent Document 2 both have recesses formed by embossing. The cleaning sheet of Patent Document 1 can scrape off dust with hard parts formed around the recesses by embossing the recesses, but the recesses reduce the contact area with the cleaning surface, making it difficult to wipe the entire cleaning surface. The cleaning sheet of Patent Document 2 also has an area without recesses, making it easy to wipe the cleaning surface with a surface. However, the cleaning sheet of Patent Document 2 cannot ensure the rigidity of the outer end of the central part that comes into contact with the cleaning target, and the cleaning sheet can become twisted.

[0005] The present invention has been made in consideration of such problems, and provides a cleaning sheet that is capable of both scraping off dust and wiping the entire cleaning surface while suppressing wrinkling of the cleaning sheet. [Means for solving the problem]

[0006] A cleaning sheet according to one embodiment is attached to a cleaning tool having a cleaning surface that extends in a planar direction including a first direction and a second direction and faces a cleaning target. The cleaning sheet has a sheet center portion that is arranged on the cleaning surface, and sheet side portions that are arranged on the outside of the sheet center portion in the second direction and detachably engage with the cleaning tool. The cleaning sheet has a first surface, a second surface located opposite to the first surface, compressed regions located at both ends of the cleaning sheet in the second direction and in which compressed portions compressed in the thickness direction are formed from the first surface to the second surface, and a non-compressed region located between the compressed regions in the second direction and in which the compressed portions are not provided over the entire area in the first direction. The outer end of the sheet center portion in the second direction is located within the compressed region. The compression area has a first compression area adjacent to the non-compression area, and a second compression area located outside the first compression area in the second direction and having a higher area ratio of the compression portion than the first compression area. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a schematic view of a cleaning tool and a cleaning sheet according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a schematic view of a cleaning tool and a cleaning sheet according to a second embodiment. [Diagram 3] FIG. 3 is a plan view of the cleaning sheet according to the embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along the line AA shown in FIG. [Diagram 5] FIG. 5 is an enlarged view of part B shown in FIG. [Figure 6] FIG. 6 is an enlarged view of a portion C shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (1) Overview of the embodiment At least the following points will become apparent from the description of this specification and the accompanying drawings. The invention according to the first aspect is a cleaning sheet that is attached to a cleaning tool that extends in a planar direction including a first direction and a second direction and has a cleaning surface facing a cleaning target. The cleaning sheet has a sheet center portion that is arranged on the cleaning surface, and sheet side portions that are provided on the outside of the sheet center portion in the second direction and detachably engage with the cleaning tool. The cleaning sheet has a first surface, a second surface located opposite to the first surface, compressed regions that are located at both ends of the cleaning sheet in the second direction and have compressed portions compressed in the thickness direction from the first surface to the second surface, and a non-compressed region that is located between the compressed regions in the second direction and has no compressed portions provided over the entire area in the first direction. The outer end of the sheet center portion in the second direction is located within the compressed region. The compressed area has a first compressed area adjacent to the non-compressed area, and a second compressed area located outside the first compressed area in the second direction and having a higher area ratio of the compressed area than the first compressed area. According to this aspect, when the cleaning sheet is attached to the cleaning tool so that the sheet center of the cleaning sheet is located on the cleaning surface, the non-compressed area and the compressed areas located on both sides of the non-compressed area are arranged on the cleaning surface of the cleaning tool. When the cleaning sheet is applied to the cleaning target in this attached state and wiped, the compressed area and the non-compressed area become the cleaning target. The periphery of the depression of the compressed part in the compressed area becomes locally hard due to the formation of the depression during compression, and becomes a part that is easy to scrape off dust. In addition, the non-compressed area where the depression due to the compressed part is not formed comes into contact with the cleaning target with a surface, and the entire surface of the cleaning target can be wiped. In addition, the outer end of the sheet center in the second direction is located within the compressed area. Therefore, when the cleaning tool is moved in the second direction to perform wiping cleaning, the cleaning sheet is less likely to wrinkle because the compressed area is located on the upstream side of the wiping direction. Also, when the cleaning tool is moved in the second direction to perform wiping cleaning, it touches the cleaning target in the order of the compressed area located on the upstream side, the non-compressed area, and the compressed area located on the downstream side. When the cleaner repeatedly moves the cleaning tool with the cleaning sheet attached back and forth, the dirt is scraped off in the compressed area and wiped off in the non-compressed area, and these processes are repeated. Therefore, dust can be effectively scraped off and wiped off.In addition, because the compressed region has a first compressed region and a second compressed region, the rigidity of the cleaning sheet can be increased from the inside to the outside in the second direction. Therefore, when the cleaning tool is moved in the second direction to wipe and clean, the cleaning sheet is less likely to stretch due to the frictional force with the cleaning surface, and wrinkles in the cleaning sheet can be suppressed, allowing for continuous cleaning.

[0009] According to a preferred embodiment, the invention according to embodiment 2 may have the following features in the invention according to embodiment 1. The compressed area is continuous in the second direction from the outer end of the cleaning sheet to the edge of the non-compressed area. According to this embodiment, a compressed area that is continuous in the second direction can be arranged on the outside of the second direction relative to the center of the center of the sheet central part in the second direction, and dust can be effectively scraped and wiped off.

[0010] According to a preferred aspect, the invention according to aspect 3 may have the following features in the invention according to aspect 1 or aspect 2. The second compressed area extends inward from the outer end of the cleaning sheet in the second direction. The first compressed area is continuous in the second direction from the outer end of the second compressed area to the outer end of the non-compressed area. According to this aspect, the rigidity of the cleaning sheet can be increased stepwise from the inner side to the outer side in the second direction, so that the cleaning sheet is less likely to stretch when a cleaning tool is moved in the second direction to wipe and clean, and wrinkling of the cleaning sheet can be suppressed, allowing for continuous cleaning.

[0011] According to a preferred embodiment, the invention according to embodiment 4 may have the following features in the invention according to any one of embodiments 1 to 3. The cleaning sheet has a crease formed therein that is folded along the outer edge of the cleaning surface in the second direction. According to this embodiment, the crease serves as an index for aligning the cleaning sheet with the outer edge of the cleaning surface in the second direction when the cleaning sheet is attached, and a user can attach the cleaning sheet to an appropriate position relative to the cleaning surface by using the crease as an index.

[0012] According to a preferred embodiment, the invention according to embodiment 5 may have the following features in the invention according to any one of embodiments 1 to 4. The outer end of the center part of the sheet in the second direction is disposed in the first compression area. The first compression area comes into contact with the object to be cleaned, ensuring the scraping ability of dust by the recesses, while the area ratio of the recesses in the first compression area is relatively small, so that wiping ability can also be ensured by the first compression area.

[0013] According to a preferred embodiment, the invention according to embodiment 6 may have the following features in the invention according to any one of embodiments 1 to 5. The compressed portion of the first compressed region is linear and extends in the second direction, straddling the outer end of the central portion of the sheet in the second direction. According to this embodiment, since the compressed portion of the first compressed region is linear and extends in the second direction, dust can be scraped off over a wide range in the second direction, improving scraping performance. Since the compressed portion of the first compressed region straddles the outer end of the central portion of the sheet in the second direction, the rigidity of the outer end of the central portion of the sheet in the second direction is increased, and twisting of the sheet during cleaning can be further suppressed.

[0014] According to a preferred embodiment, the invention according to embodiment 7 may have the following features in the invention according to any one of embodiments 1 to 6. The ratio of the length of the non-compressed region in the second direction to the length of the center part of the sheet in the second direction is 0.5 or more. According to this embodiment, the area of ​​the non-compressed region in the surface that comes into contact with the cleaning target is half or more, thereby improving wiping performance by the non-compressed region.

[0015] According to a preferred embodiment, the invention according to embodiment 8 may have the following features in the invention according to any one of embodiments 1 to 6. The ratio of the length of the compressed region in the second direction to the length of the center part of the sheet in the second direction is 0.5 or more. According to this embodiment, the area of ​​the compressed region in the surface that comes into contact with the cleaning target is half or more, thereby improving the ability of the compressed region to scrape off dust.

[0016] According to a preferred embodiment, the invention according to embodiment 9 may have the following features in the invention according to any one of embodiments 1 to 8. The cleaning sheet has a first layer constituting the first surface, a second layer constituting the second surface, and an intermediate layer disposed between the first layer and the second layer. In the second direction, an outer end of the intermediate layer is located inside the outer end of the first layer and the outer end of the second layer. The compressed parts are formed in the first layer, the second layer, and the intermediate layer. The outer end of the intermediate layer in the second direction is located within the second compressed region. According to this embodiment, the cleaning sheet is arranged in the following order from the center to the outside in the second direction: a non-compressed region, a region in the first compressed region where the intermediate layer is disposed, a region in the second compressed region where the intermediate layer is disposed, and a region in the second compressed region where the intermediate layer is not disposed. Therefore, the thickness of the cleaning sheet is reduced from the center to the outside in the second direction of the cleaning sheet. The side parts of the cleaning sheet are the parts that engage with the cleaning tool, and the thin cleaning sheet allows for flexible deformation when engaged, improving operability when attached. Meanwhile, the center of the cleaning sheet in the second direction is the surface that comes into contact with the object to be cleaned, and the thick cleaning sheet increases the liquid chemical holding capacity in sheets that hold liquid chemicals, and ensures the dust scraping capacity in sheets that do not hold liquid chemicals.

[0017] According to a preferred embodiment, the invention according to embodiment 10 may have the following features in the invention according to any one of embodiments 1 to 9. The cleaning sheet has a first layer constituting the first surface, a second layer constituting the second surface, and an intermediate layer arranged between the first layer and the second layer. In the second direction, the outer end of the intermediate layer is located inside the outer end of the first layer and the outer end of the second layer. In the second direction and the first direction, the outer end of the first layer and the outer end of the second layer reach the outer end of the cleaning sheet. According to this embodiment, since the outer end of the first layer and the outer end of the second layer reach the outer end of the cleaning sheet, the first layer and the second layer are arranged over the entire cleaning sheet, and there is no area where only one layer is arranged. Since the first layer and the second layer are arranged over the entire cleaning sheet, the rigidity of the cleaning sheet can be ensured, and therefore breakage and twisting due to the area with low rigidity can be suppressed. Furthermore, because the length of the intermediate layer in the second direction is short, the side portions of the cleaning sheet in the second direction can be flexibly deformed, improving operability during attachment.

[0018] According to a preferred embodiment, the invention according to embodiment 11 may have the following features in the invention according to any one of embodiments 1 to 10. The cleaning sheet has a first recess that is recessed from the first surface to the second surface by the compression portion, and a second recess that is recessed from the second surface to the first surface by the compression portion. The depth of the first recess and the depth of the second recess are different. According to this embodiment, the difference in depth between the first recess and the second recess allows the user to recognize the first surface and the second surface of the cleaning sheet by touch and sight. When it is desired to improve the dust scraping performance, the surface to be used can be appropriately selected, for example, by applying a deep recess to the cleaning target.

[0019] According to a preferred embodiment, the invention according to embodiment 12 may have the following features in the invention according to any one of embodiments 1 to 11. The cleaning sheet is impregnated with a chemical solution. The chemical solution is impregnated at 200% by weight or more per sheet weight (dry basis). The amount of chemical solution impregnated in the non-compressed area is greater than the amount of chemical solution impregnated in the compressed area. According to this embodiment, by increasing the amount of chemical solution impregnated in the non-compressed area, the wiping performance of the surface can be improved, while by reducing the amount of chemical solution impregnated in the compressed area, friction with the surface to be cleaned can be suppressed, improving operability during cleaning.

[0020] According to a preferred embodiment, the invention according to embodiment 13 may have the following features in the invention according to any one of embodiments 1 to 12. The amount of chemical liquid impregnated in the second compression area is less than the amount of chemical liquid impregnated in the first compression area. According to this embodiment, the small amount of chemical liquid impregnated in the second compression area allows the device to flexibly deform during attachment operation, and prevents excessive chemical liquid from adhering to the hand during attachment operation, improving operability. Meanwhile, the first compression area is the surface that comes into contact with the object to be cleaned, and can apply the chemical liquid to the object to be cleaned while suppressing friction with the surface of the object to be cleaned.

[0021] (2) Cleaning sheet according to the embodiment Hereinafter, the cleaning sheet 1 according to the embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratios of the dimensions are different from the actual ones. Therefore, the specific dimensions should be determined with reference to the following description. In addition, the drawings may include parts with different dimensional relationships and ratios.

[0022] The cleaning sheet 1 is a sheet attached to a cleaning tool 200 for use. The cleaning tool 200 can be, for example, a cleaning tool 200X according to a first embodiment shown in FIG. 1 and a cleaning tool 200Y according to a second embodiment shown in FIG. 2. FIG. 1(A) is a perspective view showing the cleaning tool 200X according to the first embodiment and the cleaning sheet 1 attached to the cleaning tool 200X, and FIG. 1(B) shows a state in which the cleaning head 201 of the cleaning tool 200X is unfolded. FIG. 2 is a perspective view showing the cleaning tool 200Y according to the second embodiment and the cleaning sheet 1 attached to the cleaning tool 200Y. Note that, for convenience, the compressed portion of the cleaning sheet 1 is omitted in FIGS. 1 and 2.

[0023] The cleaning tool 200 has a cleaning surface 210 facing the cleaning target. The cleaning surface 210 may be provided on the cleaning head 201. The cleaning surface 210 extends in a planar direction including a first direction L and a second direction W. The cleaning sheet 1 comes into contact with the cleaning surface 210, and the cleaning target is cleaned by the contacted cleaning sheet 1. The cleaning surface 210 may be a rectangular surface. The cleaning surface 210 of the cleaning tool 200X in the first form has a first cleaning surface 211 and a second cleaning surface 212. The first cleaning surface 211 and the second cleaning surface 212 are aligned in the second direction W when the cleaning head 201 is unfolded. The cleaning head 201 is configured to be foldable around a center line between the first cleaning surface 211 and the second cleaning surface 212 (a virtual cleaning center line 210CW described later). When the cleaning tool is in use, the first cleaning surface 211 and the second cleaning surface 212 are folded and disposed on opposite sides. The cleaning tool 200X has a connecting part 215 that rotatably supports the cleaning surface 210. The cleaning surface 210 is rotatable via the connecting part 215. Therefore, the cleaning tool 200X in the first form can be disposed in a state in which the first cleaning surface 211 side faces the cleaning target, and in a state in which the second cleaning surface 212 side faces the cleaning target.

[0024] The cleaning surface 210 of the first embodiment is a surface obtained by combining the first cleaning surface 211 and the second cleaning surface 212. Therefore, the length W210 of the cleaning surface 210 in the second direction W is the combined length of the length W211 of the first cleaning surface 211 in the second direction W and the length W212 of the second cleaning surface 212 in the second direction W. On the other hand, the cleaning tool 200Y according to the second embodiment has one cleaning surface 210. Therefore, the length W210 of the cleaning surface 210 in the second direction W is the length W210 of the second direction W of one cleaning surface 210. In this embodiment, the length W210 of the cleaning surface 210 in the second direction W is shorter than the length L210 of the cleaning surface 210 in the first direction L. However, in a modified example, the length W210 of the cleaning surface 210 in the second direction W may be longer than the length L210 of the cleaning surface 210 in the first direction L, or the length W210 of the cleaning surface 210 in the second direction W may be the same as the length L210 of the cleaning surface 210 in the first direction L.

[0025] The cleaning tool 200 may have an engagement part 230 that detachably engages with the cleaning sheet 1 at a location other than the cleaning surface 210, such as a surface opposite to the cleaning surface 210. The cleaning tool 200 may have a grip part 250 that is connected to the cleaning surface 210 and is gripped by a user. In a form in which the length of the cleaning surface 210 in the first direction L is longer than the length of the cleaning surface 210 in the second direction W, as in this embodiment, the cleaning tool 200 may be designed on the assumption that the user will move the cleaning tool 200 back and forth in the second direction W. The cleaning tool may be for flooring (where the grip part is long and the user cleans the floor surface while standing) or for handy use (where the grip part is short and the user cleans the range that can be reached by hand).

[0026] The cleaning sheet 1 is a sheet-like fiber structure having a function of cleaning the surface of a cleaning target such as a floor surface, furniture, and home appliances by wiping off dust and dirt from the cleaning target. FIG. 3 is a plan view of the cleaning sheet 1. FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. 3. FIG. 5 is an enlarged view of a portion B shown in FIG. 3. The cleaning sheet 1 has a planar direction including a first direction L and a second direction W, and a thickness direction T perpendicular to the planar direction. The cleaning sheet 1 has a first surface 11 and a second surface 12 extending in the planar direction. The second surface 12 is the surface opposite to the first surface 11. In this embodiment, the shape of the first surface 11 and the shape of the second surface are substantially the same, and both of them constitute wiping surfaces for wiping the cleaning target. A user can clean with the first surface 11 by bringing the second surface 12 into contact with the cleaning surface 210 of the cleaning tool 200, and can clean with the second surface 12 by bringing the first surface 11 into contact with the cleaning surface 210 of the cleaning tool 200. That is, dust and dirt on the cleaning target can be wiped off by both the first surface 11 and the second surface 12. Therefore, the description of the first surface 11 can be replaced with the description of the second surface 12, and the plan view seen from the first surface 11 side shown in FIG.

[0027] The cleaning sheet 1 may be configured to include at least one fiber layer, and may preferably include a plurality of fiber layers. The cleaning sheet 1 of this embodiment has a first layer 21 constituting the first surface 11, a second layer 22 constituting the second surface 12, and an intermediate layer 23 disposed between the first layer 21 and the second layer 22. The cleaning sheet 1 may be a dry sheet or a wet sheet. The cleaning sheet 1 of this embodiment is a wet sheet impregnated with a cleaning chemical solution. In the wet cleaning sheet 1, the intermediate layer 23 functions as a water-retaining layer that retains the chemical solution, and the first layer 21 and the second layer 22 may be configured to form a wiping surface for wiping the cleaning target and to release the chemical solution.

[0028] The first layer 21 and the second layer 22 may be made of a hydrophobic nonwoven fabric or may be made of a hydrophilic nonwoven fabric. Since the first layer 21 and the second layer 22 are made of a hydrophobic nonwoven fabric, the cleaning target can be wiped off with a relatively weak force, and the constituent fibers are less likely to become worn out even when the cleaning sheet 1 is in a wet state, so that the cleaning sheet 1 can exhibit a better dirt removal performance. The hydrophobic nonwoven fabrics constituting the first layer 21 and the second layer 22 are not particularly limited as long as they can form the wiping surface of the cleaning sheet 1, and any hydrophobic nonwoven fabric can be used. Such a hydrophobic nonwoven fabric may be a nonwoven fabric made of only hydrophobic fibers, or a nonwoven fabric made of hydrophilic and hydrophobic fibers, as long as it has hydrophobicity as a nonwoven fabric. The thickness, basis weight, etc. of the hydrophobic nonwoven fabric forming the first layer 21 and the second layer 22 are not particularly limited as long as they do not impair the effects of the present invention, and any thickness, basis weight, etc. can be adopted. However, from the viewpoints of the dirt removal performance and the chemical release property of the first layer 21 and the second layer 22, it is preferable that the thickness, basis weight, etc. of the hydrophobic nonwoven fabric be 10 g / m per layer for the first layer 21 and the second layer 22. 2 ~80g / m 2 The preferred basis weight is within the range of 30 g / m 2 ~60g / m 2 It is more preferable that the basis weight is within the range of 1. The first layer 21 and the second layer 22 may be formed of any fiber sheet (e.g., woven fabric or knitted fabric) or a porous resin sheet other than the hydrophobic nonwoven fabric, as long as they form the wiping surface of the cleaning sheet 1 and can release the chemical solution.

[0029] The intermediate layer 23 may be disposed between the first layer 21 and the second layer 22 and formed of a hydrophilic nonwoven fabric capable of retaining the chemical solution of the cleaning sheet 1. Since the intermediate layer 23 is formed of a hydrophilic nonwoven fabric, the cleaning sheet 1 can appropriately release the chemical solution retained in the intermediate layer 23 to the cleaning target through the first layer 21 and the second layer 22. The hydrophilic nonwoven fabric forming the intermediate layer 23 is not particularly limited as long as it can retain the chemical solution, and any hydrophilic nonwoven fabric can be used. Since such a hydrophilic nonwoven fabric only needs to have hydrophilicity as a nonwoven fabric, it may be a nonwoven fabric made of only hydrophilic fibers, a nonwoven fabric made of hydrophilic fibers and hydrophobic fibers, or a nonwoven fabric made of only hydrophobic fibers that has been subjected to a hydrophilization treatment. The thickness, basis weight, etc. of the hydrophilic nonwoven fabric forming the intermediate layer 23 are not particularly limited as long as they do not impede the effects of the present invention, and any thickness, basis weight, etc. can be adopted. However, in terms of impregnation and release of the chemical solution, the basis weight is set to 15 g / m 2 ~100g / m 2 The preferred basis weight is within the range of 30 g / m 2 ~80g / m 2 It is more preferable that the basis weight is within the range of 1. The intermediate layer 23 may be formed of any fiber sheet (e.g., woven fabric or knitted fabric) other than the hydrophilic nonwoven fabric, or a resin sheet having water retention, as long as it can retain the drug solution.

[0030] In a plan view of the cleaning sheet 1, the dimensions of the first layer 21 and the second layer 22 may be the same. In addition, in a plan view of the cleaning sheet 1, the dimensions of the intermediate layer 23 may be the same as the dimensions of the first layer 21 (second layer 22), or may be different from the dimensions of the first layer 21 (second layer 22) as in the present embodiment. In the present embodiment, the length in the second direction W of the intermediate layer 23 is shorter than the length in the second direction W of the first layer 21 (second layer 22), and the outer end 23E in the second direction W of the intermediate layer 23 is located inside in the second direction W than the outer end 21E (22E) in the second direction W of the first layer 21 (second layer 22). In the present embodiment, the length in the first direction L of the intermediate layer 23 is the same as the length in the first direction L of the first layer 21 (second layer 22). As shown in FIG. 4, the length in the second direction W of the intermediate layer 23 is shorter than the length in the second direction W of the first layer 21 and the length in the second direction W of the second layer 22. In a region outside the intermediate layer 23 in the second direction W, the first layer 21 and the second layer 22 abut against each other, and are joined by the compressed portions 50. The compressed portions 50 will be described in detail later.

[0031] 3, the cleaning sheet 1 has, in a plan view, a sheet center portion R1 disposed on the cleaning surface 210, and sheet side portions R2 disposed on the outer sides in the second direction W across the sheet center portion R1 and removably engaging with the cleaning tool 200. The sheet center portion R1 is a region that passes through the center of the cleaning sheet 1 in the second direction W, includes a sheet center imaginary line 1CW parallel to the first direction L, and extends from the sheet center imaginary line 1CW to both outer sides in the second direction W. The sheet side portions R2 are regions that extend from the outer end of the cleaning sheet 1 in the second direction W to the inner side in the second direction W. The outer end of the sheet center portion R1 in the second direction W and the inner end of the sheet side portion R2 in the second direction W are adjacent to each other.

[0032] The sheet center R1 is an area that contacts the cleaning surface 210 when attached to the cleaning tool 200. The sheet side R2 may be an area that contacts a surface other than the cleaning surface 210 (for example, a surface opposite to the cleaning surface 210, a side surface extending in the thickness direction from the cleaning surface, etc.) when attached to the cleaning tool 200. Since the positional relationship between the cleaning sheet 1 and the cleaning surface 210 changes depending on the manner in which the cleaning tool 200 is attached by the user, the sheet center R1 may be an area that contacts the cleaning surface 210 in a state in which the sheet center virtual line 1CW and the cleaning center virtual line 210CW that passes through the center of the second direction W of the cleaning surface 210 and is parallel to the first direction L coincide (hereinafter, the attached state). In the first form of the cleaning tool 200X, the cleaning center virtual line 210CW is a virtual line that extends parallel to the first direction L between the first cleaning surface 211 and the second cleaning surface 212 in the unfolded state. The length of the sheet center R1 in the second direction W may match the length of the cleaning surface 210 in the second direction W. In a configuration in which the cleaning sheet 1 has an alignment portion (for example, a fold described later) that can be aligned with the outer edge of the cleaning surface 210 in the second direction W, the alignment portion may form the outer edge of the sheet center.

[0033] The cleaning sheet 1 has compressed portions 50 compressed in the thickness direction from the first surface 11 to the second surface 12. The "compressed portions" in this embodiment do not include portions where only the first surface 11 is compressed or portions where only the second surface 12 is compressed, but are compressed portions formed by compressing the entire sheet in the thickness direction T from the first surface 11 to the second surface 12. The compressed portions 50 bond the first layer 21 and the second layer 22, or bond the first layer 21, the intermediate layer 23, and the second layer 22 together.

[0034] The cleaning sheet 1 has compressed regions R50 located at both ends of the cleaning sheet 1 in the second direction W and in which compressed portions 50 are formed, and non-compressed regions R55 located between the compressed regions R50 in the second direction W and in which the compressed portions 50 are not provided over the entire area in the first direction L. The compressed regions R50 are located on both sides of a sheet center imaginary line 1CW, and are regions in which the compressed portions 50 are provided on any part of an imaginary line parallel to the first direction L. In other words, the compressed regions R50 are regions other than the region (non-compressed regions R55) in which the compressed portions 50 are not provided over the entire area in the first direction L. The compressed regions R50 may be provided at the ends of the cleaning sheet 1 in the second direction W, and may be provided at the outer end of the cleaning sheet 1 in the second direction W, or may be provided at a predetermined distance (for example, within 10 mm) from the outer end of the cleaning sheet 1 in the second direction W. The non-compressed region R55 is located inside the compressed region R50 in the second direction W. The non-compressed region R55 and the compressed region R50 are adjacent to each other. In a configuration in which one compressed region is provided on each side of the non-compressed region R55, the inner end of the compressed region R50 in the second direction W constitutes the outer end of the non-compressed region R55 in the second direction W. However, in a modified example, a plurality of compressed regions R50 may be provided on each side of the sheet center virtual line 1CW. The non-compressed region R55 is a region in which the compressed portion 50 is not formed, and may have compressed portions that do not constitute the compressed portion 50 of the present application, such as a portion in which only the first layer 21 is compressed, or a portion in which only the second layer 22 is compressed.

[0035] The outer end of the sheet center R1 in the second direction W is located within the compressed area R50. Therefore, when the cleaning sheet 1 is attached to the cleaning tool 200 so that the sheet center R1 of the cleaning sheet 1 is located on the cleaning surface 210, the non-compressed area R55 and the compressed areas R50 located on both sides of the non-compressed area R55 are arranged on the cleaning surface 210 of the cleaning tool 200. When the cleaning sheet 1 is applied to a cleaning target in this attached state and wiped, the compressed area R50 and the non-compressed area R55 correspond to the cleaning target. The periphery of the recess of the compressed part 50 in the compressed area R50 (see, for example, FIG. 6) becomes locally hard due to the formation of the recess during compression, and becomes a part that is easy to scrape off dust. In addition, the non-compressed area R55 where no recess is formed by the compressed part 50 comes into contact with the cleaning target with its surface, and the entire surface of the cleaning target can be wiped. The outer end of the sheet center R1 in the second direction W is located within the compressed area R50. The compressed region R50 has a higher rigidity than the non-compressed region R55 due to the compression part 50. Therefore, when the cleaning tool 200 is moved in the second direction W to perform wiping cleaning, the cleaning sheet 1 is less likely to be twisted because the compressed region R50 is located on the upstream side of the wiping direction. In addition, when the cleaning tool 200 is moved in the second direction W to perform wiping cleaning, the cleaning target is touched in the order of the compressed region R50 located on the upstream side, the non-compressed region R55, and the compressed region R50 located on the downstream side. When the cleaner repeatedly moves the cleaning tool 200 with the cleaning sheet 1 attached back and forth, the dirt is scraped off in the compressed region R50 and wiped off in the non-compressed region R55, and these are repeated. Therefore, dust can be effectively scraped off and wiped off.

[0036] The compressed region R50 has a first compressed region R51 adjacent to the non-compressed region R55, and a second compressed region R52 located outside the first compressed region R51 in the second direction W and having a higher area ratio of the compressed portions 50 than the first compressed region R51. The area ratio is the ratio of the area of ​​the compressed portions 50 per unit area in a plan view of the cleaning sheet 1. Since the compressed region R50 has the first compressed region R51 and the second compressed region R52, the rigidity of the cleaning sheet 1 gradually increases from the inside to the outside in the second direction W of the cleaning sheet 1. Therefore, when wiping along the second direction W of the cleaning sheet 1, the cleaning sheet 1 is less likely to stretch due to the frictional force with the cleaning surface 210, and the cleaning sheet 1 can be prevented from twisting, allowing cleaning to be continued.

[0037] The difference between the area ratio of the compressed portions 50 in the first compression region R51 and the area ratio of the compressed portions 50 in the second compression region R52 may be at least 10% or more, and preferably 30% or more. The area ratio of the compressed portions 50 in the first compression region R51 may be 5% or more, and preferably 30% or more and less than 50%. The area ratio of the compressed portions 50 in the second compression region R52 may be 20% or more, and preferably 50% or more and 75% or less. In the embodiment, the dot-like compressed portions 50 are arranged in a lattice pattern in the first compression region R51, and the dot-like compressed portions 50 are arranged in a straight line in the first and second directions in the second compression region R52. Note that the dot-like compressed portions 50 may be intermittently arranged compressed portions 50, and include not only circular compressed portions but also graphic compressed portions such as star-shaped and heart-shaped compressed portions.

[0038] The compressed region R50 may be continuous in the second direction W from the outer end of the cleaning sheet 1 to the edge of the non-compressed region R55. That is, the outer end of the compressed region R50 in the second direction W coincides with the outer end of the cleaning sheet in the second direction W, and the inner end of the compressed region R50 in the second direction W coincides with the outer end of the non-compressed region R55 in the second direction W, and the non-compressed region R55 does not have to be provided between the outer end of the compressed region R50 in the second direction W and the inner end of the compressed region R50 in the second direction W. According to this configuration, the compressed region R50 that is continuous in the second direction W can be disposed outside the second direction W relative to the center of the sheet center portion R1 in the second direction W, and dust can be effectively scraped and wiped off. Furthermore, even if the sheet center R1 of the cleaning sheet 1 is shifted in the second direction W relative to the cleaning surface 210, the compressed area R50 is likely to be positioned at the outer end of the sheet center R1 in the second direction W, and the compressed area R50 located upstream in the wiping direction can suppress wrinkling of the cleaning sheet 1.

[0039] The second compressed region R52 may extend inward from the outer end of the cleaning sheet 1 in the second direction W, and the first compressed region R51 may be continuous from the outer end of the second compressed region R52 to the outer end of the non-compressed region R55 in the second direction W. The first compressed region R51 and the second compressed region R52 may be adjacent to each other in the second direction W, and preferably, at least a part of the compressed portions 50 of the first compressed region R51 may be adjacent to the compressed portions 50 of the second compressed region R52. According to this configuration, the second compressed region R52, the first compressed region R51, and the non-compressed region R55 are arranged from the outside to the inside in the second direction W of the sheet center portion R1, and these regions are connected to each other, so that the rigidity can be increased stepwise from the inside to the outside in the second direction W of the cleaning sheet 1. When the cleaning tool 200 is moved in the second direction W to perform wiping cleaning, the cleaning sheet 1 is less likely to stretch, and twisting of the cleaning sheet 1 can be suppressed, allowing cleaning to be continued.

[0040] The cleaning sheet 1 may be formed with a crease FL that is folded along the outer edge of the second direction W of the cleaning surface 210. The crease FL may be formed over the entire area of ​​the cleaning sheet 1 in the first direction L on both sides of the sheet center virtual line 1CW in the second direction W. According to this configuration, the crease FL serves as an index for aligning with the outer edge of the cleaning surface 210 in the second direction W when attaching the cleaning sheet 1, and the user can attach the cleaning sheet 1 to an appropriate position on the cleaning surface 210 using the crease FL as an index. In the cleaning sheet 1 having the crease FL, an area sandwiched between a pair of creases FL may constitute the sheet center portion R1. The area sandwiched between the pair of creases FL may coincide with the length of the cleaning surface 210 in the second direction W, but may be longer than the length of the cleaning surface 210 in the second direction W by a predetermined length (for example, 10 mm or less).

[0041] The pair of folds FL may be folds that fold the sheet toward the same surface. That is, the pair of folds FL may be folds that fold the sheet toward the first surface 11, or may be folds that fold the sheet toward the second surface 12. When the pair of folds FL are folds that fold the sheet toward the same surface, the cleaning sheet 1 can be easily attached to the cleaning tool 200. In addition, when the pair of folds FL are folds that fold the sheet toward the same surface, the cleaning head 201 of the cleaning tool 200 can be disposed between the opposing surfaces, so that the cleaning sheet 1 can be attached so that both ends of the cleaning surface 210 in the second direction W are sandwiched by the folds of the cleaning sheet 1, improving operability during attachment and allowing the sheet to be attached in an appropriate position. In a state where the sheet is folded by the pair of folds FL, it is preferable that the portions folded by the folds FL do not overlap each other. That is, when the space between the pair of folds constitutes the sheet center portion R1, it is preferable that the sheet side portions R2 do not overlap each other in a folded state. According to this configuration, when unfolding the folded parts from a folded state, it becomes easier to grasp and unfold each folded part, improving operability when wearing the device.

[0042] The outer end of the sheet center portion R1 in the second direction W may be disposed in the first compression region R51. According to this configuration, the first compression region R51 comes into contact with the cleaning target, and the concave portion of the compression portion ensures the scraping of dust, while the area ratio of the concave portion in the first compression region R51 is relatively small, so that the wiping performance can be ensured. The sheet side portion R2 is a portion that engages with the cleaning tool 200. The entire second compression region R52 may be disposed in the sheet side portion R2. According to this configuration, the rigidity of the portion that engages with the cleaning tool 200 is increased by the second compression region R52, and the shifting relative to the cleaning tool 200 can be suppressed. Preferably, the second compression region R52 may be provided at a position that engages with the engagement portion 230 of the cleaning tool 200 in the attached state.

[0043] The compressed portions 50 of the first compressed region R51 may be linear in shape extending in the second direction W and straddling the outer end of the sheet center R1 in the second direction W. The configuration extending in the second direction W includes not only a configuration parallel to the second direction W, but also a configuration inclined at less than 45 degrees with respect to the second direction W. The linear compressed portions include not only a continuous linear configuration, but also a configuration in which a plurality of compressed portions are arranged side by side at a predetermined interval or less (for example, 5 mm or less, preferably 3 mm or less), and a group of compressed portions is arranged linearly. Since the recesses formed by the compressed portions of the first compressed region R51 are linear in shape extending in the second direction W, dust can be scraped off over a wide range in the second direction W, improving scraping performance. Since the compressed portions 50 of the first compressed region R51 straddle the outer end of the sheet center R1 in the second direction W, the rigidity of the outer end of the sheet center R1 in the second direction W can be increased, and the cleaning sheet 1 can be more prevented from twisting during cleaning.

[0044] The ratio of the length in the second direction W of the non-compressed region R55 to the length in the second direction W of the sheet center R1 may be 0.5 or more. According to this configuration, the area of ​​the non-compressed region R55 on the surface that contacts the cleaning target is more than half, so the wiping performance by the non-compressed region R55 can be improved. The ratio of the length in the second direction W of the non-compressed region R55 to the length in the second direction W of the sheet center R1 may be less than 0.9. According to this configuration, 10% or more of the sheet center R1 becomes the compressed region R50. In another embodiment, the ratio of the length in the second direction W of the compressed region R50 to the length in the second direction W of the sheet center R1 may be 0.5 or more. According to this configuration, the area of ​​the compressed region R50 on the surface that contacts the cleaning target is more than half, so the dust scraping performance by the compressed region R50 can be improved. Here, the length in the second direction W of the compressed region R50 is the total length of the lengths in the second direction W of each compressed region R50.

[0045] The intermediate layer 23 may be disposed across the compressed region R50 and the non-compressed region R55. By providing an area in which the three layers, the first layer 21, the second layer 22, and the intermediate layer 23, are laminated in the compressed region R50, the rigidity of the cleaning sheet 1 can be increased stepwise from the inside to the outside in the second direction W. In a modified example, the intermediate layer 23 may be disposed only in the non-compressed region R55. Also, the intermediate layer 23 may be disposed across the sheet center portion R1 and the sheet side portion R2. Since the intermediate layer 23 is disposed across the outer end of the sheet center portion R1 in the second direction W, the intermediate layer 23 can increase the rigidity of the outer end of the sheet center portion R1 in the second direction W. When the cleaning tool 200 is moved in the second direction W to perform wiping cleaning, the cleaning sheet 1 is less likely to stretch, and the cleaning sheet 1 can be prevented from twisting, allowing cleaning to be continued. In a modified example, the intermediate layer 23 may be disposed only in the sheet center portion R1.

[0046] The compressed portion 50 may be formed in the first layer 21, the second layer 22, and the intermediate layer 23. The outer end of the intermediate layer 23 in the second direction W may be located in the first compressed region R51 or in the second compressed region R52. In this embodiment, the outer end of the intermediate layer 23 in the second direction W is located in the second compressed region R52. According to this configuration, from the center of the cleaning sheet 1 in the second direction W toward the outside, the non-compressed region R55, the region in which the intermediate layer 23 is arranged in the first compressed region R51, the region in which the intermediate layer 23 is arranged in the second compressed region R52, and the region in which the intermediate layer 23 is not arranged in the second compressed region R52 are arranged in this order. Therefore, the thickness of the cleaning sheet 1 becomes thinner from the center of the cleaning sheet 1 toward the outside in the second direction. The side portion of the cleaning sheet 1 is a portion that engages with a cleaning tool, and the thin thickness of the sheet allows it to be flexibly deformed when engaged, improving operability when worn. On the other hand, the center of the cleaning sheet 1 in the second direction W is the surface that comes into contact with the object to be cleaned, and the thickness of the cleaning sheet 1 is large, so that the chemical liquid retention capacity is increased in sheets that retain the chemical liquid, and the dust scraping capacity is ensured in sheets that do not retain the chemical liquid.

[0047] In the second direction W and the first direction L, the outer end of the first layer 21 and the outer end of the second layer 22 may reach the outer end of the cleaning sheet 1. The first layer 21 and the second layer 22 are arranged over the entire cleaning sheet 1, and there is no region where only one layer is arranged. If there is a region where only one layer is arranged, a region with low rigidity (a region where only one layer is arranged) is locally formed, and there is a risk of breakage or twisting occurring in the region with low rigidity. However, the first layer 21 and the second layer 22 are arranged over the entire cleaning sheet 1, and the rigidity of the cleaning sheet 1 can be ensured. Therefore, breakage or twisting caused by the region with low rigidity can be suppressed. In this embodiment, in the first direction L, the outer end of the first layer 21, the outer end of the second layer 22, and the outer end of the intermediate layer 23 reach the outer end of the cleaning sheet. In the second direction W, the outer ends of the first layer 21 and the second layer 22 reach the outer end of the cleaning sheet 1, and the outer end of the middle layer 23 does not reach the outer end of the cleaning sheet 1 and is located inside the outer end of the cleaning sheet 1.

[0048] FIG. 6 is an enlarged view of the C portion shown in FIG. 4. In the cross section of FIG. 4, the depressions caused by the compression parts 50 are not shown, but in the cross section of FIG. 6, the depressions caused by the compression parts 50 are shown. The compression parts 50 are formed over the entire area of ​​the thickness direction T of the cleaning sheet 1. The first layer 21, the second layer 22, and the intermediate layer 23 have portions recessed in the thickness direction by the compression parts 50. The cleaning sheet 1 may have a first recess 57 recessed from the first surface 11 to the second surface 12 by the compression parts 50, and a second recess 58 recessed from the second surface 12 to the first surface 11 by the compression parts 50. The depth D57 of the first recess 57 and the depth D58 of the second recess 58 may be different. According to this configuration, the difference in depth between the first recess 57 and the second recess 58 allows the user to recognize the first surface 11 and the second surface 12 of the cleaning sheet 1 by touch and vision. When it is desired to enhance the dust scraping performance, the surface to be used can be appropriately selected, for example, by applying the deep recessed portion to the object to be cleaned.

[0049] The first recess 57 may be formed only in the first layer 21, or may be formed in the first layer 21 and the intermediate layer 23. The second recess 58 may be formed only in the second layer 22, or may be formed in the second layer 22 and the intermediate layer 23. In this embodiment, the first recess is formed in the first layer 21 and the intermediate layer 23, and the second recess 58 is formed in the second layer 22 and the intermediate layer 23. As shown in FIG. 6, the depth D57 of the first recess 57 is the distance in the thickness direction T between the portion of the first surface 11 where the compressed portion 50 is not formed and the bottom of the first recess 57, and the depth D58 of the second recess 58 is the distance in the thickness direction T between the portion of the second surface 12 where the compressed portion 50 is not formed and the bottom of the second recess 58. When comparing the depth of the first recess 57 and the depth of the second recess 58, the recesses that overlap in the thickness direction T are compared. That is, the depth of the recesses formed by the same compressed portion 50 is compared.

[0050] The cleaning sheet 1 of this embodiment is wet type and is impregnated with a chemical solution for cleaning. The chemical solution may contain, for example, water, a surfactant, alcohol, glycerin, and other components. The chemical solution may be impregnated at 200% by weight or more per cleaning sheet weight (dry basis), and preferably at 300% by weight or more. The amount of chemical solution impregnated in the non-compressed region R55 may be greater than the amount of chemical solution impregnated in the compressed region R50. According to this configuration, by increasing the amount of chemical solution impregnated in the compressed region R50, the wiping performance on the surface can be improved, while by reducing the amount of chemical solution impregnated in the compressed region R50, friction with the surface to be cleaned can be suppressed, and operability during cleaning can be improved. In addition, the amount of chemical solution impregnated in the second compressed region R52 may be less than the amount of chemical solution impregnated in the first compressed region R51. According to this configuration, the amount of the chemical solution impregnated in the second compression region R52 is small, so that the second compression region R52 can flexibly deform during the wearing operation, and the chemical solution is prevented from adhering too much to the hand during the wearing operation, improving the wearing operability. On the other hand, the first compression region R51 is the surface that comes into contact with the object to be cleaned, and can apply the chemical solution to the object to be cleaned while suppressing friction with the surface of the object to be cleaned.

[0051] Although the present invention has been described in detail using the above-mentioned embodiment, it is clear to those skilled in the art that the present invention is not limited to the embodiment described in this specification. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention. [Explanation of symbols]

[0052] 1: Cleaning sheet 11: 1st page 12:Second side 21 :1st layer 22: 2nd layer 23: Middle class 50: Compression section 57: First recess 58: Second recess 200: Cleaning equipment 210:Cleaning surface R1: Center of seat R2: Seat side R50: Compression area R51: First compression area R52: Second compression area R55: Non-compressed area FL: Fold L: 1st direction W: Second direction T: Thickness direction

Claims

1. A cleaning sheet that is attached to a cleaning tool having a cleaning surface that extends in a planar direction including a first direction and a second direction and faces a cleaning target, the cleaning sheet has a sheet center portion that is placed on the cleaning surface, and sheet side portions that are provided on the outer sides of the sheet center portion in the second direction and that removably engage with the cleaning tool, the cleaning sheet has a first surface, a second surface opposite to the first surface, compressed regions located at both ends of the cleaning sheet in the second direction and having compressed portions compressed in a thickness direction from the first surface to the second surface, and a non-compressed region located between the compressed regions in the second direction and in which the compressed portions are not provided over the entire area in the first direction, The outer end of the sheet central portion in the second direction is located within the compressed region, the compressed region includes a first compressed region adjacent to the non-compressed region, and a second compressed region located further outward in the second direction than the first compressed region and having a higher area ratio of the compressed portion than the first compressed region.

2. The cleaning sheet according to claim 1 , wherein the compressed region is continuous in the second direction from an outer end of the cleaning sheet to an edge of the non-compressed region.

3. the second compressed region extends inwardly from an outer edge of the cleaning sheet in the second direction; 3. The cleaning sheet according to claim 1, wherein the first compressed region is continuous in the second direction from an outer end of the second compressed region to an outer end of the non-compressed region.

4. The cleaning sheet according to claim 1 or 2, wherein the cleaning sheet has a crease formed along an outer edge of the cleaning surface in the second direction.

5. The cleaning sheet according to claim 1 or 2, wherein an outer end of the central portion of the sheet in the second direction is located in the first compressed region.

6. The cleaning sheet according to claim 5 , wherein the compressed portions of the first compressed region are linear and extend in the second direction and span an outer edge of the sheet center portion in the second direction.

7. 3. The cleaning sheet according to claim 1, wherein a ratio of a length in the second direction of the non-compressed region to a length in the second direction of the central portion of the sheet is 0.5 or greater.

8. 3. The cleaning sheet according to claim 1, wherein a ratio of a length of the compressed region in the second direction to a length of the central portion of the sheet in the second direction is 0.5 or greater.

9. the cleaning sheet has a first layer constituting the first surface, a second layer constituting the second surface, and an intermediate layer disposed between the first layer and the second layer, an outer end of the intermediate layer is located more inward than an outer end of the first layer and an outer end of the second layer in the second direction; The compressed portion is formed in the first layer, the second layer, and the intermediate layer, The cleaning sheet according to claim 1 or 2, wherein an outer end of the intermediate layer in the second direction is located within the second compressed region.

10. the cleaning sheet has a first layer constituting the first surface, a second layer constituting the second surface, and an intermediate layer disposed between the first layer and the second layer, an outer end of the intermediate layer is located more inward than an outer end of the first layer and an outer end of the second layer in the second direction; The cleaning sheet according to claim 1 or 2, wherein an outer end of the first layer and an outer end of the second layer reach an outer end of the cleaning sheet in the second direction and the first direction.

11. the cleaning sheet has a first recess that is recessed from the first surface to the second surface by the compression portion, and a second recess that is recessed from the second surface to the first surface by the compression portion, The cleaning sheet according to claim 1 or 2, wherein a depth of the first recess is different from a depth of the second recess.

12. The cleaning sheet is impregnated with a chemical solution, The chemical solution is impregnated in the sheet at 200% by weight or more based on the sheet weight (on a dry basis), The cleaning sheet according to claim 1 or 2, wherein an amount of the chemical solution impregnated in the non-compressed area is greater than an amount of the chemical solution impregnated in the compressed area.

13. The cleaning sheet according to claim 12 , wherein an amount of the chemical solution impregnated in the second compression area is less than an amount of the chemical solution impregnated in the first compression area.

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