Cleaning sheet and cleaner

Abstract

To provide a cleaning sheet capable of accurately removing both liquid such as water and solid foreign matter which may be present on a surface to be cleaned.SOLUTION: A cleaning sheet having a first side and a second side is provided. The cleaning sheet is provided with a base material having a water absorbing layer at least on the front surface and an adhesive partially arranged on the water absorbing layer. The first surface includes a cleaning surface having a first region where the adhesive is exposed and a second region where the water absorbing layer is exposed. The cleaning sheet has a water absorption of 0. 5g / dm2 or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cleaning sheet and a cleaner including the cleaning sheet. [Background technology]

[0002] Adhesive cleaners that use an adhesive to capture foreign matter such as dust and dirt on the surface to be cleaned are widely used as cleaning means for floors, carpets, etc. For example, an adhesive cleaner is known that includes a roll-shaped capture member (adhesive roll) with an adhesive surface on its outer periphery, and is configured to capture and remove foreign matter from the surface to be cleaned by rolling the roll while bringing the adhesive surface into contact with the surface to be cleaned. Patent Documents 1 and 2 are examples of technical documents that disclose this type of adhesive cleaner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-000745 [Patent Document 2] Japanese Utility Model Application Publication No. 61-160856 Summary of the Invention [Problem to be solved by the invention]

[0004] Due to the way in which they are used, foreign objects such as hair and fiber debris often fall onto the floors of bathrooms and changing rooms. Furthermore, these floors are prone to becoming wet due to splashes and drips of water. Patent Document 2 proposes an adhesive tape for cleaners that can effectively adhere and collect debris on wet floors, but further study is needed to obtain a practically satisfactory product.

[0005] Therefore, an object of the present invention is to provide a cleaning sheet that can accurately remove both liquids such as water and solid foreign matter that may be present on the surface to be cleaned. Another related invention is to provide a cleaner equipped with such a cleaning sheet. [Means for solving the problem]

[0006] According to this specification, a cleaning sheet having a first side and a second side is provided. The cleaning sheet comprises a substrate having a water-absorbing layer on at least the front side, and an adhesive partially disposed on the water-absorbing layer. The first side of the cleaning sheet includes a cleaning surface having a first region where the adhesive is exposed and a second region where the water-absorbing layer is exposed. The cleaning sheet has a water absorption capacity of 0.5 g / dm 2 That's it. Here, "dm" stands for "decimeter."

[0007] The cleaning sheet having such a configuration has a cleaning surface on its first side, which has the first region (the adhesive-exposed region) and the second region (the water-absorbing layer-exposed region), and therefore the cleaning surface can simultaneously remove liquids such as water and solid foreign matter from the surface to be cleaned. Furthermore, the cleaning sheet is configured to ensure a predetermined amount of water absorption, so that even a wet surface can be efficiently cleaned.

[0008] In some embodiments, the cleaning sheet is preferably configured as an adhesive sheet in which the cleaning surface is an adhesive surface, which makes it easy to achieve high levels of both liquid removal and solid foreign matter removal.

[0009] The substrate may further include a waterproof layer disposed on the back side of the water-absorbing layer. By providing a waterproof layer on the back side of the water-absorbing layer, liquid absorbed from the first side of the cleaning sheet can be prevented from seeping out from the second side. This prevents the liquid from spreading beyond direct contact with the surface to be cleaned, for example, in a roll-type cleaning sheet or a cleaning sheet in which multiple sheets are stacked. Furthermore, for example, in a configuration in which only one cleaning sheet is used, the liquid can be prevented from adhering to members or fingers in contact with the second side of the cleaning sheet.

[0010] In some embodiments, the interlayer strength between the waterproof layer and the water absorption layer is preferably about 0.5 N / 25 mm or more, which makes it easier to prevent the waterproof layer and the water absorption layer from accidentally separating.

[0011] In some embodiments, the tear strength of the cleaning sheet is preferably at least about 1.0 N. This makes it easier to prevent vertical tearing when the outer peripheral end (turning opening) of the cleaning sheet is lifted from the inner cleaning sheet, for example, when renewing the outer peripheral surface of a cleaning roll around which the cleaning sheet is wound.

[0012] In some embodiments, the cleaning sheet has a slit extending in a direction (e.g., widthwise direction) that is transverse to the longitudinal direction of the cleaning sheet. By providing such a slit, it becomes easier to separate a portion of the cleaning sheet from the remainder using the slit, improving the usability of the cleaning sheet.

[0013] The cleaning sheet disclosed herein can be wound with the cleaning surface facing outward to form a cleaning roll, which can be used, for example, by rolling over a surface to be cleaned, to efficiently remove liquid and solid foreign matter from the surface to be cleaned.

[0014] According to this specification, a cleaner is provided that includes a cleaning roll on which any of the cleaning sheets disclosed herein is wound with the cleaning surface facing outward, and a jig that supports the cleaning roll so that it can roll. The cleaner is used in a manner in which the cleaning roll rolls over a surface to be cleaned, and can efficiently remove liquid and solid foreign matter from the surface to be cleaned.

[0015] Appropriate combinations of the elements described in this specification may also be included within the scope of the invention for which patent protection is sought by this application. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view schematically illustrating a cleaning roll around which a cleaning sheet according to an embodiment is wound with the cleaning surface facing outward. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] 1 is a front view schematically illustrating a cleaner according to an embodiment. [Figure 4] FIG. 4 is a view taken in the direction of the arrow IV in FIG. 3. [Figure 5] FIG. 10 is a perspective view schematically illustrating a cleaning roll around which a cleaning sheet according to another embodiment is wound with the cleaning surface facing outward. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments of the present invention are described below. Matters necessary for carrying out the present invention other than those specifically mentioned in this specification can be understood by those skilled in the art based on the teachings for carrying out the invention described in this specification and the common general technical knowledge at the time of filing. The present invention can be carried out based on the contents disclosed in this specification and the common general technical knowledge in the relevant field. Furthermore, in the following drawings, components and parts that perform the same function may be denoted by the same reference numerals, and redundant explanations may be omitted or simplified. Furthermore, the embodiments shown in the drawings are schematic for the purpose of clearly explaining the present invention, and do not necessarily accurately represent the size or scale of the actual product provided.

[0018] FIG. 1 is a perspective view showing a cleaning roll on which a cleaning sheet according to one embodiment is wound with the cleaning surface facing outward, and FIG. 2 is a cross-sectional view showing a cross section of the cleaning sheet cut along the width direction.

[0019] The cleaning sheet 10 is in the form of a tape (long strip) having a first side 10A and a second side 10B, and comprises a substrate 20 having a water-absorbing layer 22, and an adhesive 31 partially disposed on the water-absorbing layer 22. The substrate 20 further comprises a waterproof layer 24 disposed on the back side of the water-absorbing layer 22. The surface of the waterproof layer 24 may be subjected to a known release treatment (for example, a release treatment using a silicone-based release agent).

[0020] The widthwise center portion of the first side 10A of the cleaning sheet 10 forms a cleaning surface 11 having a first region (adhesive-exposed region) where the adhesive 31 is exposed, and a second region (water-absorbing layer-exposed region) 32 where the water-absorbing layer 22 is exposed. In this embodiment, the first region is formed by adhesive 31 arranged partially on the water-absorbing layer 22, more specifically, in stripes that are approximately parallel to the longitudinal direction of the cleaning sheet 10, and the space between the stripes forms the second region 32. Both ends in the width direction of the first side 10A are adhesive-free portions 12, 13 where no adhesive 31 is arranged.

[0021] In this embodiment, as clearly shown in FIG. 2 , the adhesive 31 is disposed so that its upper end protrudes higher than the surface of the water-absorbing layer 22 (i.e., so that the first region protrudes higher than the second region). However, the height relationship between the first and second regions is not limited to this; the first region may be lower than the second region, or the first and second regions may be approximately the same height. For example, by forming a recess on the front side of the water-absorbing layer and filling the recess partially or entirely with adhesive, a cleaning surface can be formed in which the first region is lower than the second region or approximately the same height as the second region. In some embodiments, it is preferable that the first region protrudes higher than the second region, or that the first and second regions are approximately the same height. A cleaning sheet configured in this manner easily allows the adhesive to directly contact the surface to be cleaned when the cleaning surface is brought into contact with the surface to be cleaned, thereby providing excellent removal of solid foreign matter. For example, the cleaning sheet is excellent at capturing solid foreign matter (e.g., hair, lint, etc.) that spans multiple first regions. Furthermore, a configuration in which the first region protrudes from the second region is preferable because not only the top surface of the first region but also the side surface can be used to capture solid foreign matter. For convenience of explanation, in Fig. 2, the adhesive 31 and the water absorption layer 22 are separated by a straight line, but if the water absorption layer 22 is porous, for example, the adhesive 31 may be disposed so that at least a portion thereof permeates the water absorption layer 22.

[0022] The cleaning roll 1 is formed by winding a cleaning sheet 10 around a core 40 in a roll shape with the cleaning surface 11 facing outward (toward the outer periphery of the roll). For ease of explanation, FIG. 1 shows the cleaning sheet 10 unwound from the outer periphery (turn-up opening) 16 of the cleaning sheet 10 by a length equivalent to approximately one circumference of the cleaning roll 1. When the surface performance of the cleaning roll 1 (e.g., its ability to capture objects to be removed or its water absorption performance) deteriorates, the cleaning sheet 10 can be unwound (rewound) and cut off in this manner to expose a new cleaning surface 11 on the surface of the cleaning roll 1. In other words, the cleaning roll 1 is configured to maintain its performance by renewing its surface through the unwrapping and cutting. To facilitate such cutting, the cleaning sheet 10 is provided with cutting slits 14 approximately every one circumference of the cleaning roll 1. The slits 14 are cutting means used to make it easier to cut one longitudinal end of the cleaning sheet 10 from the remainder, and can be, for example, a series of elongated holes or wavy slits, or intermittent slits such as perforations.

[0023] In some embodiments, the slits 14 are preferably provided at positions where the length measured from the outer circumferential edge 16 along the longitudinal direction of the cleaning sheet 10 is slightly longer (for example, about 2 mm to 10 mm) than the circumference of the cleaning roll 1. With this configuration, the slits 14 on the outermost side of the cleaning roll 1 are covered by the cleaning sheet 10 that constitutes the outermost periphery of the cleaning sheet 1, and do not come into direct contact with the surface to be cleaned. Therefore, by pulling out the cleaning sheet 10 from a cleaning roll 1 that has been used on a wet surface to be cleaned and cutting it off at the slits 14, the areas of the cleaning sheet 10 that have absorbed water are removed, and the remaining cleaning roll 1 can be kept dry. The slits 14 are preferably provided so that this relationship is maintained approximately the same from the inner periphery to the outer periphery of the cleaning roll 1.

[0024] In the example shown in FIG. 1, the slit 14 is provided along the width direction of the cleaning sheet 10 (the direction perpendicular to the longitudinal direction), but it may also be provided diagonally relative to the width direction. The direction in which the slit extends may be constant or may change midway. For example, there may be one or more points midway across the width of the cleaning sheet where the direction in which the slit extends is bent linearly or curved. In the example shown in FIG. 1, the slit 14 is provided across the entire width of the cleaning sheet 10, but it may also be a slit that extends from one side of the width of the cleaning sheet to midway to provide an opening for cutting.

[0025] The core 40 of the cleaning roll 1 is preferably made of paper (typically cardboard) from the standpoints of cost, ease of disposal, cushioning, etc. Alternatively, the core may be made of other materials (for example, synthetic resin, metal, etc.). Furthermore, the cleaning roll may be a so-called coreless type, in which only the cleaning sheet is wound into a roll without using a core. In other words, in the cleaning roll disclosed herein, the core is merely an optional component.

[0026] The cleaning roll 1 can be used, for example, together with a jig 50 as shown in FIGS. 3 and 4 as a component of a cleaner 100 in which the cleaning roll 1 is attached to a rotating member 52 of the jig 50. The rotating member 52 is rod-shaped and rotatably supported at one end of a rod-shaped gripping member 54. The cleaner 100 is configured such that the cleaning roll 1 rotates in the circumferential direction of the roll in conjunction with the rotating member 52, for example, by inserting the rotating member 52 into a hollow portion provided at the winding center of the cleaning roll 1 (in an embodiment having a winding core, this may be the hollow portion of the winding core). The cleaner 100 can be preferably used in an embodiment in which the other end of the gripping member 54 is gripped and the cleaning roll 1 is rolled along the surface of the surface 56 to be cleaned while the outer circumferential surface of the cleaning roll 1 is brought into contact with the surface of the surface 56 to be cleaned.

[0027] The shape of the jig that constitutes the cleaner together with the cleaning roll is not limited to that shown in FIGS. 3 and 4 , and various shapes of jigs can be applied depending on the purpose and application. For example, in the shape shown in FIGS. 3 and 4 , the gripping members 54 extend in the radial direction of the cleaning roll 1. However, the gripping members may extend along the winding axis of the cleaning roll, or may extend in a direction that forms an angle with the winding axis of approximately 60 degrees or less, 45 degrees or less, or 30 degrees or less. Furthermore, the cleaner provided by this specification is not limited to the shape including a jig and a cleaning roll as shown in FIG. 3 , and the cleaning roll itself may be used as a cleaner. In other words, the cleaning roll can also be understood as a cleaner. The cleaning roll disclosed herein may also be a cleaning roll (refill cleaning roll) that is attached to an appropriate jig in a replaceable or disposable form to constitute a cleaner as needed.

[0028] The cleaning sheet disclosed herein may be used in a form that is not wound into a roll, for example, in a sheet-like form. For example, the sheet-like cleaning sheet can be used as a cleaner by attaching it to an appropriate jig or by itself without using a jig. The sheet-like cleaning sheet may be used alone or in the form of a stack of two or more sheets. The stack can be used in such a manner that the outermost cleaning sheet is brought into contact with the surface to be cleaned. When the outermost cleaning sheet is peeled off from the rest of the stack, a new cleaning sheet becomes the outermost surface of the stack. This allows the outermost surface of the stack to be renewed. The cleaning sheet disclosed herein may also be configured as a cleaning roll wound with the cleaning surface facing inward, as opposed to the example shown in FIG. 1. A sheet-like cleaning sheet can be obtained by pulling (rewinding) the cleaning sheet from such a cleaning roll and cutting it to an appropriate length. The sheet-like cleaning sheet can be used as a cleaner by attaching it to an appropriate jig or by itself without using a jig.

[0029] <Water absorption amount> The cleaning sheet disclosed herein has a water absorption capacity of 0.5 g / dm 2 The cleaning sheet has a cleaning surface having an exposed adhesive region (first region) and an exposed water-absorbing layer region (second region), and the water absorption amount is 0.5 g / dm or more. 2 As a result of the above, liquid such as water and solid foreign matter can be removed simultaneously and efficiently from the surface to be cleaned.

[0030] To improve the liquid removal efficiency, the cleaning sheet's water absorption capacity is set at 0.7 g / dm 2 It is preferable that the content is 0.9 g / dm or more. 2 More preferably, it is 1.0 g / dm or more. 2 More than 1.2g / dm 2 More than 1.5g / dm 2 The upper limit of the water absorption is not particularly limited, and may be, for example, 8 g / dm 2 In some embodiments, from the viewpoint of achieving a good balance between the liquid removal performance and the solid foreign matter removal performance of the adhesive while suppressing the thickness of the cleaning sheet, the water absorption amount is, for example, 5.0 g / dm 2 may be less than or equal to 3.5 g / dm 2 Less than 2.5g / dm 2 The water absorption capacity of the cleaning sheet is measured by the method described in the Examples below. The water absorption capacity of the cleaning sheet can be adjusted by selecting the water absorption layer, the area ratio of the first region to the cleaning surface (adhesive area ratio), the amount of adhesive applied to the water absorption layer, etc.

[0031] <Water absorption layer> The cleaning sheet disclosed herein includes a substrate, and the substrate has a water-absorbing layer on at least the front surface. In other words, at least the front surface of the substrate is made of a water-absorbing layer. The entire substrate may be made of a water-absorbing layer. In such a substrate, the back surface of the substrate is also made of a water-absorbing layer.

[0032] The water-absorbing layer has a water-absorbing property that allows the cleaning sheet to be constructed with the above-mentioned water-absorbing amount. Therefore, the water-absorbing amount of the water-absorbing layer is approximately 0.5 g / dm 2 It is appropriate that the content is more than 0.5g / dm 2 In some embodiments, the water absorption capacity of the water absorption layer is approximately 1.0 g / dm 2 It is preferable that the content is equal to or more than 1.3 g / dm 2 More preferably, it is about 1.5 g / dm 2 More than 1.8g / dm 2 The upper limit of the water absorption amount of the water absorption layer is not particularly limited, and is, for example, about 10.0 g / dm 2 From the viewpoint of strength and thickness control of the cleaning sheet, in some embodiments, the water absorption layer has a water absorption coefficient of about 7.0 g / dm 2 or less, and may be approximately 5.0 g / dm 2 Less than 3.0g / dm 2 The water absorption capacity of the water-absorbing layer is measured in the same manner as that of the cleaning sheet, except that a test piece prepared by cutting the water-absorbing layer (e.g., nonwoven fabric) into a square with sides of 10 cm is used. The water absorption capacity of the water-absorbing layer can be adjusted by selecting the material, structure, basis weight, etc. of the water-absorbing layer.

[0033] In some preferred embodiments, the water-absorbing layer is porous. A porous water-absorbing layer tends to exhibit the desired water absorption while suppressing volumetric changes and strength loss due to water absorption, compared to, for example, non-porous water-absorbing layers that absorb water primarily by swelling. This is preferable from the perspective of preventing the adhesive from falling off due to water absorption (which can cause the adhesive to remain on the surface to be cleaned). For the same reason, the adhesive used in the cleaning sheet disclosed herein is preferably water-insoluble and non-water-swellable.

[0034] Suitable examples of porous water-absorbing layers include water-absorbing layers made of various fibrous aggregates. In this specification, the term "fibrous aggregate" encompasses not only materials made of an aggregate of many fibers, but also materials made of one or a small number of accumulated fibers. Such fibrous aggregates are generally constructed to maintain their aggregated form through physical actions such as entanglement, crossing, and bundling of fibers, and / or chemical actions such as fusion, welding, binding with a binder, and bonding by chemical reaction. The fibrous aggregates may be called nonwoven fabrics, woven fabrics, paper, felt, etc. The material of the fibers constituting the fibrous aggregate is not particularly limited and can be appropriately selected from various natural fibers (typically, cellulosic fibers such as cotton) and chemical fibers (synthetic fibers, semi-synthetic fibers, regenerated fibers such as rayon, inorganic fibers, etc.). The material of the fibers constituting the fibrous aggregate may be one type or two or more types. Examples of water-absorbing layers that can be preferably used in terms of absorbency, flexibility, compatibility with adhesives, etc. include cotton nonwoven fabrics and rayon nonwoven fabrics. In view of the surface renewal workability when the cleaning sheet disclosed herein is made into a cleaning roll, cotton nonwoven fabric is more preferred. Another example of a porous water-absorbing layer is a water-absorbing layer made of a foam with an open cell structure, such as polyurethane foam or polyvinyl alcohol (PVA) foam.

[0035] The basis weight of the water-absorbing layer is not particularly limited and can be appropriately selected so as to achieve a cleaning sheet with a desired amount of water absorption. In some embodiments, the basis weight of the water-absorbing layer is preferably 15 g / m 2 More preferably, 25 g / m 2 or more, 30 g / m 2 More than 35g / m 2 As the basis weight of the water-absorbent layer increases, the water absorption capacity and tear strength of the cleaning sheet having the water-absorbent layer tend to increase. In some embodiments, the basis weight of the water-absorbent layer is, for example, 150 g / m 2 may be less than 100 g / m 2 Less than 80g / m 2Less than 60g / m 2 Reducing the basis weight of the water-absorbing layer is preferable from the viewpoint of making the cleaning sheet thinner and saving resources.

[0036] <Adhesive> An adhesive is partially disposed on the water-absorbing layer. This forms a cleaning surface on the first side of the cleaning sheet, which has a first region where the adhesive is exposed and a second region where the water-absorbing layer is exposed. The cleaning surface may cover the entire first side of the cleaning sheet, or may be a region excluding a portion of the cleaning surface. For example, as shown in FIGS. 1 and 2, non-adhesive sections 12 and 13, which are not provided with adhesive and do not form a cleaning surface, may be provided along both ends of the substrate 20 in the width direction. The widths of the non-adhesive sections 12 and 13 may each be, for example, approximately 3 mm to 20 mm (typically 5 mm to 15 mm). The widths of the non-adhesive sections 12 and 13 may be the same or different. The non-adhesive sections may be provided only on one end of the substrate 20 in the width direction. By providing an adhesive-free portion on at least one end side in the width direction of the substrate, it is possible to achieve effects such as making it easier to grasp the outer peripheral end (turning opening) of the cleaning sheet when replacing the cleaning sheet exposed on the outermost periphery of the cleaning roll, and to make it easier to cut off the cleaning sheet that has been pulled out from the roll, etc. The adhesive-free portion may be provided continuously or intermittently over only a portion of the entire length of the substrate.

[0037] The ratio of the area of ​​the first region to the area of ​​the entire cleaning surface (hereinafter also referred to as the "adhesive area ratio") is calculated by the following formula: [(total area of ​​the first region) / (total area of ​​the first region + total area of ​​the second region)] × 100. The adhesive area ratio can be, for example, 5% or more, suitably 10% or more, or may be 15% or more, 25% or more, 35% or more, or 45% or more. As the adhesive area ratio increases, the ability to capture solid foreign matter tends to improve. In some embodiments, the adhesive area ratio is suitably 95% or less, preferably 85% or less, or may be 75% or less, 65% or less, or 55% or less. As the adhesive area ratio decreases, the amount of water absorption of the cleaning sheet generally tends to increase.

[0038] The arrangement of the first regions on the cleaning surface is not particularly limited and may be, for example, stripes, dots (multiple dots or islands), a grid, or a combination thereof. The arrangement pattern of the first regions may be regular or random. The arrangement pattern of the first regions may be the same across the entire cleaning surface or may vary depending on the position (e.g., position in the width direction). From the viewpoint of ease of manufacturing and ease of forming a cleaning roll, it is advantageous to have the same arrangement pattern across the entire cleaning surface. The first regions may also be provided approximately evenly across the entire cleaning surface, or may be provided so that the density varies depending on the position (e.g., position in the width direction) by, for example, adjusting the arrangement frequency or size of the pattern. From the viewpoint of ease of manufacturing the cleaning sheet and shape accuracy when formed into a cleaning roll, a configuration in which the first regions are provided approximately evenly across the entire cleaning surface is preferably adopted. The arrangement pattern of the first regions can be controlled, for example, by the arrangement pattern of the adhesive. Note that it is advantageous for the arrangement of the first regions and the arrangement of the adhesive to match from the viewpoint of ease of manufacturing, but is not limited thereto.

[0039] In some preferred embodiments, the first regions are formed by adhesives arranged in stripes spaced apart across the width of the cleaning sheet. This type of cleaning sheet is preferable because it has a uniform cross-sectional shape at each longitudinal position, resulting in less variation in feel (touch) when a cleaning roll around which the cleaning sheet is wound rolls over a target surface (surface to be cleaned). This allows for smooth rolling, which is also advantageous from the viewpoint of preventing uneven cleaning.

[0040] In embodiments in which the adhesive is arranged in stripes, the width W1 of the adhesive constituting each stripe (width of the first region) is not particularly limited and can be designed according to the application. In some embodiments, the width W1 of the adhesive (see FIG. 2) can be, for example, approximately 0.1 mm or more. From the viewpoint of enhancing the ability to capture solid foreign matter, it is advantageous to set it to approximately 0.3 mm or more, and it may be approximately 0.5 mm or more, or approximately 0.7 mm or more. The width W1 can be, for example, approximately 20 mm or less. From the viewpoint of suppressing uneven removal of liquid from the surface to be cleaned, it is appropriate to set it to approximately 10 mm or less, preferably approximately 5 mm or less, or it may be approximately 2 mm or less. The spacing W2 between adjacent lines (width of the second region) is appropriate to set it to approximately 0.1 mm or more, and it is preferable to set it to approximately 0.3 mm or more, and it may be approximately 0.5 mm or more or approximately 0.7 mm or more, from the viewpoint of enhancing water absorption. The width W2 (see Figure 2) can be, for example, approximately 20 mm or less, and from the viewpoint of suppressing uneven removal of solid foreign matter on the surface to be cleaned, it is appropriate to set it to approximately 10 mm or less, preferably to approximately 5 mm or less, and may also be set to approximately 2 mm or less.

[0041] In an embodiment in which the adhesive is arranged in a dotted pattern, the shape of the dots is not particularly limited, and may be, for example, a circle, an ellipse, an oval, a sector (e.g., a semicircle), a ring, a quadrangle (a square, a rectangle, a trapezoid, a diamond, etc.), a polygon other than a quadrangle (a triangle, a hexagon, etc.), or any other shape representing various designs, symbols, letters, etc., or a shape combining one or more of these. The area of ​​each dot is, for example, approximately 0.1 mm 2 From the viewpoint of capturing solid foreign matter, the thickness can be set to approximately 0.5 mm or more. 2 It is preferable to set it to more than 1 mm. 2 More than that is fine, about 3mm 2 More than or approximately 6 mm 2 In order to prevent uneven removal of liquid from the surface to be cleaned, the area of ​​each dot is set to, for example, approximately 300 mm 2 It can be less than 100 mm 2 Less than (for example, approximately 30 mm 2 The interval between each dot and the adjacent dot can be, for example, about 0.1 mm to 10 mm (typically about 0.5 mm to 5 mm, for example about 1 mm to 3 mm).

[0042] The amount of adhesive contained per unit area of ​​the cleaning surface is not particularly limited and can be appropriately set so that a desired amount of water absorption is achieved and the effect of removing solid foreign matter is appropriately exhibited. In some embodiments, the amount of adhesive per unit area of ​​the cleaning surface is, for example, 3 g / m 2 From the viewpoint of coating stability, etc., it is possible to set the coating density to 5 g / m or more. 2 It is preferable that the content is 10 g / m or more. 2 More than 15g / m 2 The amount of adhesive per unit area of ​​the cleaning surface may be, for example, 120 g / m 2 or less, and from the viewpoint of appropriately suppressing the adhesive strength and facilitating the cleaning operation, 90 g / m 2 Preferably, it is 70 g / m or less. 2 Less than 50g / m 2 Less than 30g / m 2or less. The amount of adhesive contained per area of ​​the cleaning surface can be calculated from the difference between the weight per area of ​​the substrate and the weight per area of ​​the cleaning sheet in the range where the cleaning surface is formed. The amount of adhesive can be adjusted by the amount of adhesive applied per area of ​​the first region and the adhesive area ratio.

[0043] Although not particularly limited, the amount of adhesive per area of ​​the first region is, for example, 5 g / m 2 From the viewpoint of coating stability, etc., it is possible to set the coating thickness to 10 g / m or more. 2 It is preferable that the content is 15 g / m or more. 2 More than 25g / m 2 The amount of adhesive per area of ​​the first region may be, for example, 150 g / m 2 or less, and from the viewpoint of appropriately suppressing the adhesive strength and facilitating the cleaning operation, 120 g / m 2 It is preferable that the weight is less than 100 g / m 2 Less than 70g / m 2 Less than 50g / m 2 The following is also acceptable.

[0044] <Waterproof layer> The substrate may include a waterproof layer disposed on the back side of the water-absorbing layer, i.e., the side opposite the side on which the pressure-sensitive adhesive layer is provided (the back side). The waterproof layer may be a non-porous resin layer (e.g., a resin film), a closed-cell foam layer, a metal foil, a composite of these, or the like. A waterproof layer containing a non-porous resin layer is preferred because it facilitates increasing the interlayer strength described below. Here, a non-porous resin layer refers to a layer in which the pore (void) volume ratio of the apparent volume of the layer is 3% by volume or less at 25°C. Resin materials constituting the non-porous resin layer include, but are not limited to, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resins such as polyethylene (PE), polypropylene (PP), ethylene-propylene copolymer, and polypropylene-polyethylene blend resin; and other resins such as vinyl chloride resin (typically soft vinyl chloride resin), vinyl acetate resin, and polyamide resin. In some embodiments, a waterproof layer in which at least the back side is made of a polyolefin resin may be preferably employed.

[0045] The thickness of the waterproof layer is not particularly limited. The thickness of the waterproof layer may be, for example, 1 μm or more. From the viewpoint of easily realizing a cleaning sheet with appropriate strength (e.g., tear strength, interlaminar strength, etc.), the thickness of the waterproof layer is suitably 5 μm or more, preferably 10 μm or more, and more preferably 15 μm or more. The thickness of the waterproof layer may be, for example, 100 μm or less. From the viewpoint of flexibility and thinning of the cleaning sheet, the thickness of the waterproof layer is preferably 50 μm or less, more preferably 30 μm or less, and may be 25 μm or less, 20 μm or less, or 15 μm or less.

[0046] In some embodiments, the back surface of the substrate is formed of a waterproof layer (e.g., a resin layer such as a resin film). The back surface of the substrate may be subjected to a release treatment, such as application of a release agent. The release agent is not particularly limited, and for example, a silicone-based release agent, a fluorine-based release agent, a long-chain alkyl-based release agent, or other known or commonly used release agents can be used depending on the purpose and application. The release treatment can, for example, adjust the unwinding force of a cleaning sheet in roll form.

[0047] <Interlaminar strength> In some embodiments, the interlayer strength between the waterproof layer and the water-absorbing layer is preferably, for example, approximately 0.5 N / 25 mm or more. This makes it easier to prevent the waterproof layer and the water-absorbing layer from accidentally separating. This is particularly significant for cleaning sheets whose cleaning surface is an adhesive surface. The interlayer strength is more preferably approximately 1.0 N / 25 mm or more (e.g., approximately 1.5 N / 25 mm or more, or even 2.0 N / 25 mm or more). There is no particular upper limit to the interlayer strength, and a higher strength is more advantageous from the viewpoint of preventing the waterproof layer and the water-absorbing layer from accidentally separating. In some embodiments, the interlayer strength can be, for example, approximately 10 N / 25 mm or less. The interlayer strength can be measured by performing a T-peel test using the method described in the Examples below. In this method, if the waterproof layer cannot be manually peeled from the water-absorbing layer in preparation for measurement, the interlayer strength can be evaluated as being sufficiently high for practical use. Furthermore, when measuring the interlayer strength, the measured value obtained by the T-peel test is recorded as the interlayer strength, regardless of whether peeling occurs at the interface between the waterproof layer and the water-absorbing layer or whether failure occurs inside the water-absorbing layer (for example, part of the water-absorbing layer remains on the waterproof layer side). Therefore, the value of the interlayer strength may be affected not only by the bonding strength at the interface between the waterproof layer and the water-absorbing layer, but also by the internal failure prevention ability of the water-absorbing layer (which may be a water-absorbing layer partially impregnated with an adhesive).

[0048] <Cleaning sheet> The thickness of the cleaning sheet disclosed herein is not particularly limited and can be set according to the purpose. The thickness of the cleaning sheet may be, for example, 15 μm or more, 30 μm or more, 45 μm or more, 60 μm or more, or 75 μm or more. As the thickness of the cleaning sheet increases, it becomes easier to achieve both good adhesion of the cleaning surface to the surface to be removed and strength (e.g., tear strength) of the cleaning sheet. Furthermore, for example, when the cleaning sheet is in the form of a cleaning roll, from the viewpoint of reducing the size and weight of the cleaning roll or increasing the length of the cleaning sheet included in the cleaning roll, the thickness of the cleaning sheet may be, for example, 250 μm or less, 200 μm or less, 150 μm or less, 130 μm or less, 120 μm or less, or 110 μm or less.

[0049] The width of the cleaning sheet can be appropriately selected depending on the purpose and is not particularly limited. From the viewpoint of work efficiency when used in the form of a cleaning roll, the width of the cleaning sheet is suitably 5 cm or more, preferably 10 cm or more, and may be 12 cm or more, or may be 14 cm or more. The width of the cleaning sheet can be, for example, approximately 100 cm or less, typically approximately 70 cm or less, preferably approximately 50 cm or less, and may be approximately 40 cm or less, approximately 35 cm or less, or even approximately 30 cm or less (e.g., approximately 25 cm or less). The technology disclosed herein can be preferably implemented in a form in which the width of the cleaning sheet is, for example, approximately 10 cm or more and approximately 50 cm or less (preferably approximately 14 cm or more and approximately 40 cm or less).

[0050] The width of the cleaning surface formed on the first side of the cleaning sheet is preferably approximately 2.5 cm or more, and may be approximately 4.5 cm or more, approximately 9.5 cm or more, approximately 11 cm or more, or approximately 13 cm or more. The width of the cleaning surface can be, for example, approximately 98 cm or less, and from the standpoint of usability, is preferably approximately 68 cm or less, and may be approximately 48 cm or less, approximately 39 cm or less, approximately 34.5 cm or less, or even approximately 29.5 cm or less (e.g., approximately 24.5 cm or less). The technology disclosed herein can be preferably implemented in an embodiment in which the width of the cleaning surface is, for example, approximately 9.5 cm or more and approximately 48 cm or less (preferably approximately 13 cm or more and approximately 39 cm or less).

[0051] (Tear strength) In some embodiments, the tear strength of the cleaning sheet is preferably, for example, approximately 1.0 N or more. This makes it easier to prevent vertical tearing when peeling the outer peripheral edge (turning opening) of the cleaning sheet from the inner cleaning sheet when, for example, renewing the outer peripheral surface of a cleaning roll around which a cleaning sheet with an adhesive cleaning surface is wound, thereby improving the workability of renewing the outer peripheral surface. That is, when attempting to peel the outer peripheral edge of the cleaning sheet from a cleaning roll with hair, lint, or the like stuck across the outer peripheral edge of the cleaning sheet, the hair, lint, or the like may get caught and tear the cleaning sheet in the longitudinal direction (vertical direction) from the outer peripheral edge. A cleaning sheet with a predetermined tear strength or higher is advantageous from the viewpoint of preventing such vertical tearing. The tear strength is preferably 2.0 N or more, and more preferably 3.0 N or more (e.g., 4.0 N or more). The tear strength is measured by the method described in the Examples below. The vertical tearing can also be prevented by using a reinforcing means such as lead tape, which will be described later.

[0052] (Adhesive strength) The cleaning sheet disclosed herein is preferably configured as an adhesive sheet in which the cleaning surface is an adhesive surface. This configuration facilitates high levels of both liquid removal and solid foreign matter removal. Here, the cleaning surface being an adhesive surface means that the adhesive strength measured by pressing the cleaning surface against a stainless steel (SUS) plate (hereinafter also referred to as "adhesion strength to SUS") is 0.05 N / 25 mm or more. In a cleaning sheet in which the cleaning surface is an adhesive surface, it is preferable that the first region of the cleaning surface protrudes from or is roughly the same height as the second region.

[0053] The adhesive strength to SUS is measured by the 180-degree peel test specified in JIS Z 0237 using a SUS304BA plate as the adherend. Specifically, the adhesive strength to SUS is measured by the following procedure. Specifically, a test piece is prepared by cutting the cleaning sheet to be measured into a strip approximately 25 mm wide and 100 to 200 mm long. The cleaning surface of the test piece is attached to the SUS304BA plate as the adherend by rolling a 2 kg roller back and forth once. After holding the test piece at 23°C and 50% RH for 30 minutes, the 180-degree peel strength (N / 25 mm) is measured using a tensile tester in accordance with JIS Z 0237 at 23°C, 50% RH, and a pulling rate of 300 mm / min. The measurement is performed two or more times (preferably three or more times), and the arithmetic mean value is used as the adhesive strength value. The tensile tester is not particularly limited, and any known tensile tester can be used. For example, the measurement can be performed using a "Tensilon" manufactured by Shimadzu Corporation.

[0054] In some embodiments, from the viewpoint of enhancing the ability to capture solid foreign matter, the adhesive strength of the cleaning surface to SUS is suitably 0.1 N / 25 mm or more, and preferably 0.5 N / 25 mm or more (e.g., 1.0 N / 25 mm or more). On the other hand, from the viewpoint of suppressing adhesive residue (adhesive residue) on the surface to be cleaned or damage to the surface to be cleaned, the adhesive strength of the cleaning surface to SUS is suitably 5.0 N / 25 mm or less, preferably 3.0 N / 25 mm or less, more preferably 2.0 N / 25 mm or less, and may be, for example, 1.5 N / 25 mm or less. The adhesive strength to SUS can be adjusted, for example, by the amount of adhesive contained per area of ​​the cleaning surface, the adhesive area ratio, etc.

[0055] <Cleaning roll> The cleaning sheet disclosed herein can be configured as a cleaning roll by being wound with the cleaning surface facing outward. Such a cleaning roll can be used, for example, by rolling over a surface to be cleaned, and can efficiently remove liquid and solid foreign matter from the surface to be cleaned. The cleaning sheet used in this manner is preferably configured as an adhesive sheet with an adhesive cleaning surface, from the viewpoint of maintaining the shape of the cleaning roll during the rolling.

[0056] Although not particularly limited, the diameter of the cleaning roll may be, for example, approximately 10 mm or more, and typically 20 mm or more is appropriate, and may be 30 mm or more, 40 mm or more, or 50 mm or more. Here, the diameter of the cleaning roll refers to the diameter (outer diameter) of the cleaning roll when it is unused (i.e., before the product is put into use). The diameter of the cleaning roll may be, for example, approximately 200 mm or less, and from the viewpoint of operability, etc., typically approximately 150 mm or less is appropriate, and may be 100 mm or less, approximately 80 mm or less, or approximately 70 mm or less.

[0057] The inner diameter of the cleaning sheet constituting the cleaning roll may be, for example, approximately 5 mm or more, typically approximately 10 mm or more, and may be approximately 20 mm or more. Here, the inner diameter of the cleaning sheet refers to the winding diameter at the winding start end of the cleaning sheet, and in a cleaning roll in which the cleaning sheet is wound around a core, it roughly coincides with the outer diameter of the core. The inner diameter of the cleaning sheet may be, for example, approximately 180 mm or less, approximately 130 mm or less, approximately 90 mm or less, approximately 70 mm or less, or approximately 60 mm or less.

[0058] The cleaning sheet constituting the cleaning roll may have a pattern visible when viewed from the outer periphery of the cleaning roll. Here, the term "pattern" encompasses figures, symbols, letters, combinations of these, and combinations of these with colors. In some embodiments, the pattern can be provided so as to create a misalignment between the outer periphery of the cleaning sheet and the surface of the cleaning sheet adjacent to the outer periphery. Creating such a misalignment in the pattern has the effect of making the outer periphery of the cleaning sheet easier to find. Easily finding the outer periphery of the cleaning sheet (the opening for turning it over) can be useful, for example, in improving the work efficiency when renewing the adhesive exposed on the outermost periphery of the cleaning roll. The form of the pattern is not particularly limited, and may be, for example, a line or dot extending continuously or intermittently in the longitudinal direction of the cleaning sheet or in a direction intersecting the longitudinal direction. The line may be a straight line, a curved line, a broken line, a wavy line, or the like. The thickness of the line may be constant or may vary regularly or irregularly. The misalignment in the pattern may also be, for example, a difference in color. In addition to the method of utilizing the mismatch of the pattern as described above, methods for making it easier to find the outer circumferential end of the cleaning sheet include, for example, a method of applying a pattern to the cleaning sheet along the slit (for example, a colored line extending along the slit), a method of applying a pattern on the side of the slit facing the inner periphery of the roll, a method of applying patterns on both sides of the slit (for example, a triangle with the apex facing the slit), etc., and are not particularly limited. These methods may also be combined as appropriate.

[0059] The cleaning sheet may be provided with a mark indicating the recommended rolling direction of the cleaning roll. The recommended rolling direction is usually the direction in which the part of the cleaning sheet located at the outermost periphery of the cleaning roll rolls so as to contact the surface to be cleaned in order from the inner circumferential edge of the cleaning sheet to the outer circumferential edge of the cleaning sheet. The mark is not particularly limited as long as it can convey the intended information to the user, and may be, for example, a symbol such as an arrow or a figure such as a pointing finger, or may be a letter, or a combination of these.

[0060] (rewinding force) The unwinding force of the cleaning roll disclosed herein is not particularly limited and can be, for example, approximately 2.0 N / 25 mm or less. From the viewpoint of ease of use when intentionally pulling out the cleaning sheet to renew the cleaning surface appearing on the outer periphery of the cleaning roll, the unwinding force is suitably approximately 1.5 N / 25 mm or less, preferably approximately 1.0 N / 25 mm or less, and more preferably approximately 0.7 N / 25 mm or less. In some embodiments, the unwinding force may be, for example, approximately 0.5 N / 25 mm or less, approximately 0.3 N / 25 mm or less, or approximately 0.2 N / 25 mm or less. Furthermore, the unwinding force of the cleaning roll may be, for example, 0.005 N / 25 mm or more. From the viewpoint of suppressing rail drag, it is suitable to be approximately 0.01 N / 25 mm or more, or may be approximately 0.02 N / 25 mm or more, or may be approximately 0.05 N / 25 mm or more.

[0061] The unwinding force of a cleaning roll is measured as follows. Specifically, the cleaning roll to be measured is placed in a tensile tester under an environment of 23°C and 50% RH. The outer peripheral end of the wound cleaning sheet is attached to the chuck of the tensile tester and pulled at a speed of 300 mm / min (unwinding speed), thereby unwinding the cleaning roll in the tangential direction. The tensile strength observed at this time is converted into a value per 25 mm width of the cleaning surface, and the unwinding force [N / 25 mm] can be calculated.

[0062] (Rail pull prevention part) In some embodiments, the cleaning sheet constituting the cleaning roll may be provided with a railing prevention portion that partially suppresses the adhesiveness of the cleaning surface of the cleaning sheet. Railing refers to a phenomenon in which, when the cleaning roll is moved over a surface to be cleaned, the adhesive force between the cleaning sheet and the surface to be cleaned is overcome by the unwinding force, causing the cleaning sheet to stick to the surface to be cleaned and the roll to unravel. It is effective to position the railing prevention portion in a region near the outer circumferential edge of the cleaning sheet. In one embodiment, the railing prevention portion can be positioned within a range of 1 / 4 of the circumference (preferably 1 / 6 of the circumference, more preferably 1 / 8 of the circumference) from the outer circumferential edge of the cleaning sheet along the outer circumference of the cleaning roll. The railing phenomenon of the cleaning roll occurs starting from the outer circumferential edge of the cleaning sheet. Therefore, by suppressing the adhesiveness of the cleaning sheet near this outer circumferential edge, the relationship between the adhesive force to the surface to be cleaned and the adhesive force to the back surface of the cleaning sheet (which may be related to the unwinding force) can be locally adjusted, thereby effectively preventing the occurrence of railing. When the cleaning sheet constituting the cleaning roll has planned cutting locations (for example, slits 14 shown in FIG. 1 ) set, the rail pull prevention part can be positioned within a range of 1 / 4 of the circumference of the cleaning roll from each planned cutting location (i.e., a location that can become the outer peripheral end of the winding by cutting the cleaning sheet at the planned cutting location).

[0063] The anti-railing portion is preferably formed continuously or intermittently so as to extend in a direction (typically the width direction) intersecting the longitudinal direction of the cleaning sheet. An anti-railing portion having such a shape can effectively prevent the anti-railing phenomenon while suppressing a decrease in the ability to capture solid foreign matter and absorb water. In one embodiment, the anti-railing portion can be formed along the outer circumferential edge of the cleaning sheet, toward the inner circumferential edge of the cleaning sheet. The anti-railing portion may be provided over the entire length of the outer circumferential edge, or may be provided continuously or intermittently along a portion of the entire length.

[0064] The anti-railing portion may have any configuration that can partially suppress the adhesive force of the cleaning surface, and is not particularly limited. For example, in the cleaning roll shown in FIG. 1 , the anti-railing portion can be formed by attaching a lead tape 18 made of a sheet-like material having a non-adhesive or low-adhesive outer surface to the adhesive surface 11 that contacts the outer circumferential edge of the cleaning sheet and faces the inner circumferential edge of the cleaning sheet, as shown in FIG. 5 . In this embodiment, similar lead tapes 18 are also attached to the adhesive surfaces that contact each slit and face the inner circumferential edge of the cleaning sheet. The lead tape 18 is not particularly limited, and may be made of various resin films, paper, cloth, rubber sheets, foam sheets, metal foils, composites thereof, or the like. The shape of the lead tape 18 can be, for example, a strip-like shape as shown in FIG. 5 , but is not limited thereto and may be any shape that extends in the width direction of the cleaning sheet.

[0065] By disposing such a lead tape, not only can it prevent rail pulling, but it can also prevent the cleaning sheet from tearing longitudinally from the outer circumferential edge of the wound cleaning sheet (longitudinal tearing) when the outer circumferential surface (adhesive surface) of the cleaning roll is renewed. By disposing the lead tape at the position of the outer circumferential edge of the cleaning sheet (and the portion that could become the outer circumferential edge by cutting the cleaning sheet along the slit) toward the inner circumferential edge of the wound cleaning sheet, the outer circumferential edge can be reinforced with the lead tape. This makes it easier to peel the cleaning sheet from a cleaning roll that has hair, lint, or the like attached to it, improving the workability of renewing the outer circumferential surface (adhesive surface) of the cleaning roll. From this perspective, in one embodiment, a lead tape with higher strength (tensile strength, tear strength, etc.) than the cleaning sheet can be preferably used. For example, a lead tape made of a resin film such as PET or PP can be used. The resin film constituting the lead tape may contain an antistatic agent to prevent dust from adhering to it. In one embodiment, a lead tape colored differently from the cleaning sheet can be preferably used. This makes it easier to identify the outer circumferential edge or the slit of the cleaning sheet.

[0066] The width of the anti-railing portion can be, for example, 1 mm or more, and is usually 2 mm or more (e.g., 3 mm or more). Increasing the width of the anti-railing portion tends to improve the anti-railing performance. The width of the anti-railing portion can be, for example, 50 mm or less. From the perspective of maintaining adhesive performance and preventing unwinding, it is usually appropriate for the width of the anti-railing portion to be 30 mm or less, and it is preferably 15 mm or less (e.g., 10 mm or less). Furthermore, the anti-railing portion may be provided not only on the side from the intended cutting point toward the inner circumference of the winding, but also on the side from the intended cutting point toward the outer circumference of the winding (toward the outer end of the winding). For example, the anti-railing portion may be provided so as to straddle the intended cutting point and extend along the intended cutting point.

[0067] <Examples of adhesives> The adhesive used in the cleaning sheet disclosed herein is not particularly limited. Examples of the adhesive that can be used include acrylic adhesives, rubber adhesives, polyester adhesives, urethane adhesives, polyether adhesives, and silicone adhesives. Here, a rubber adhesive refers to an adhesive containing a rubber polymer as a base polymer. The same applies to other adhesives. In this specification, the term "base polymer" refers to the main component (the component with the highest blend ratio) among the polymer components. The proportion of the base polymer in the polymer components contained in the adhesive disclosed herein is typically approximately 50% by weight or more, preferably approximately 70% by weight or more, and may be approximately 90% by weight or more, based on the solid content. The upper limit of the proportion of the base polymer is 100% by weight, and may be, for example, approximately 99% by weight or less.

[0068] The form of the pressure-sensitive adhesive is not particularly limited, and may be various types of pressure-sensitive adhesives, such as a hot-melt type that is applied in a heated and molten state, an active energy ray-curable type that is cured by active energy rays, a water-dispersed type (typically an emulsion type) in which the pressure-sensitive adhesive component is dispersed in water, or a solvent-type pressure-sensitive adhesive in which the pressure-sensitive adhesive component is dissolved in an organic solvent.Preferred pressure-sensitive adhesives from the viewpoints of productivity and reducing environmental load include hot-melt type pressure-sensitive adhesives and active energy ray-curable pressure-sensitive adhesives.Of these, hot-melt type pressure-sensitive adhesives are preferred.

[0069] The method for partially disposing the adhesive on the water absorption layer of the substrate is not particularly limited, and examples thereof include a method in which the adhesive is directly applied to the substrate to form an adhesive layer (direct method), and a method in which an adhesive layer formed on a suitable release surface is transferred to the substrate (transfer method). Conventional coating methods such as a die coater or gravure coater can be used to apply the adhesive. When a hot-melt adhesive is used to form the adhesive layer, the hot-melt adhesive can be applied in the form of a heated, molten liquid that does not substantially contain an organic solvent.

[0070] In some embodiments, from the viewpoints of adhesive performance and cost, a rubber-based adhesive or an acrylic-based adhesive may be preferably used as the adhesive. A rubber-based adhesive and an acrylic-based adhesive may be used in combination by mixing (blending) or laminating. The rubber-based adhesives and acrylic-based adhesives that can be used in the cleaning sheet disclosed herein will be described in more detail below, but are not intended to limit the scope of the present invention.

[0071] (rubber adhesive) Examples of rubber-based pressure-sensitive adhesives include pressure-sensitive adhesives that use one or more rubber-based polymers as the base polymer, such as natural rubber polymers such as natural rubber and modified products thereof, isoprene rubber, chloroprene rubber, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene / butylene-styrene block copolymer (SEBS), crystalline polyolefin-ethylene / butylene-crystalline polyolefin block copolymer (CEBC), and styrene-ethylene / butylene-crystalline polyolefin block copolymer (SEBC). A suitable example of a rubber-based pressure-sensitive adhesive is a pressure-sensitive adhesive that uses SIS as the base polymer (SIS-based pressure-sensitive adhesive).

[0072] Rubber-based adhesives (e.g., SIS-based adhesives) may contain, in addition to a rubber-based polymer as a base polymer, other major components such as a tackifier resin and process oil. The types and blending ratios of each component can be set to achieve the desired solid foreign matter capture performance on the cleaning surface.

[0073] The tackifying resin may be a single resin or a combination of two or more resins, typically rosin-based, terpene-based, hydrocarbon-based, epoxy-based, polyamide-based, elastomer-based, phenol-based, or ketone-based. While not particularly limited, the amount of tackifying resin per 100 parts by weight of base polymer may be, for example, approximately 40 parts by weight or more, approximately 70 parts by weight or more, or approximately 100 parts by weight or more. Furthermore, to avoid a deterioration in low-temperature properties, the amount of tackifying resin per 100 parts by weight of base polymer is suitably, for example, approximately 250 parts by weight or less, preferably approximately 200 parts by weight or less, and may be approximately 160 parts by weight or less, approximately 140 parts by weight or less, or approximately 120 parts by weight or less.

[0074] The process oil may be, for example, a general paraffinic, naphthenic, aromatic, or other process oil, and may be used singly or in combination of two or more. While not particularly limited, the amount of process oil blended per 100 parts by weight of the base polymer may be, for example, approximately 30 parts by weight or more, approximately 50 parts by weight or more, or approximately 70 parts by weight or more. Furthermore, the amount of process oil blended per 100 parts by weight of the base polymer may be, for example, approximately 200 parts by weight or less, and from the viewpoint of preventing contamination of the surface to be cleaned, it is preferably approximately 150 parts by weight or less, and may also be approximately 120 parts by weight or less, approximately 100 parts by weight or less, or approximately 80 parts by weight or less.

[0075] Rubber-based pressure-sensitive adhesives (e.g., SIS-based pressure-sensitive adhesives) may further contain various additives such as antioxidants, antioxidants, UV absorbers, light stabilizers, antistatic agents, colorants (pigments, dyes, etc.), etc. The types and amounts of these additives may be the same as those typically used in the field of general pressure-sensitive adhesives.

[0076] (acrylic adhesive) An acrylic pressure-sensitive adhesive is a pressure-sensitive adhesive containing an acrylic polymer as a base polymer. Here, the acrylic polymer refers to a polymer in which 50% by weight or more (preferably 70% by weight or more, for example 90% by weight or more) of the total amount of monomer components constituting the polymer is a monomer having at least one (meth)acryloyl group in one molecule (hereinafter, this may be referred to as an "acrylic monomer"). In this specification, the term "(meth)acryloyl group" refers to an acryloyl group and a methacryloyl group inclusively. Similarly, in this specification, the term "(meth)acrylate" refers to an acrylate and a methacrylate inclusively.

[0077] When the acrylic polymer contains two or more types of monomers as its constituent monomer components, it may be a random copolymer, a block copolymer, a graft copolymer, or the like. From the viewpoint of ease of production and ease of adjusting adhesive properties, preferred acrylic polymers include random copolymers and block copolymers. The acrylic polymers may be used alone or in combination of two or more types.

[0078] In a preferred embodiment, the acrylic polymer includes an acrylic random copolymer synthesized from a monomer raw material containing an alkyl (meth)acrylate having an alkyl group as a main monomer. The alkyl (meth)acrylate is an alkyl (meth)acrylate having a chain alkyl group having 1 to 20 carbon atoms at the ester terminal, i.e., C 1-20 Alkyl (meth)acrylates can be preferably used. From the viewpoint of the storage modulus of the adhesive, C 1-12 (For example, C 2-10 , typically C 4-8) alkyl (meth)acrylates are preferred. These can be used alone or in combination of two or more. Preferred alkyl (meth)acrylates include n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate, etc. Among these, it is preferred to use one or both of n-butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA).

[0079] The proportion of the main monomer in all monomer components constituting the acrylic random copolymer is preferably about 60% by weight or more, more preferably about 80% by weight or more, and even more preferably about 90% by weight or more. There is no particular upper limit to the proportion of the main monomer in all monomer components, but from the viewpoint of easily adjusting the properties of the adhesive (adhesive strength, cohesive strength, etc.), it is usually preferable to set it to about 99% by weight or less (for example, about 98% by weight or less, typically about 95% by weight or less). The acrylic random copolymer may be obtained by polymerizing substantially only the main monomer.

[0080] The monomer raw material may further contain, in addition to the main monomer, a secondary monomer copolymerizable with the main monomer for the purpose of adjusting the properties of the PSA. Suitable examples of such secondary monomers include monomers having a functional group (hereinafter also referred to as functional group-containing monomers). Examples of functional group-containing monomers include carboxy group-containing monomers, acid anhydride group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, alkoxy group-containing monomers, and alkoxysilyl group-containing monomers. These monomers may be used alone or in combination of two or more. Preferred functional group-containing monomers, which facilitate the introduction of crosslinking points into the acrylic polymer and the adjustment of crosslink density, include carboxy group-containing monomers such as acrylic acid and methacrylic acid; and hydroxy group-containing monomers such as 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate. The amount of functional group-containing monomer (e.g., carboxy group-containing monomer) used may be, for example, approximately 1 to 10 wt %, approximately 2 to 8 wt %, or approximately 3 to 7 wt % of the total monomer components used to synthesize the acrylic polymer.

[0081] The monomer raw material may contain a monomer other than the functional group-containing monomer as a secondary monomer, for example, to increase the cohesive strength of the acrylic polymer. Examples of such monomers include vinyl ester monomers such as vinyl acetate and vinyl propionate; aromatic vinyl compounds such as styrene, α-methylstyrene, and vinyltoluene; and cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate. These may be used alone or in combination of two or more. The amount of secondary monomers other than the functional group-containing monomers may be appropriately selected depending on the purpose and application, but is not particularly limited. For example, it is preferable that the amount of secondary monomers other than the functional group-containing monomers be approximately 20% by weight or less (e.g., about 2 to 20% by weight, typically about 3 to 10% by weight) of the total monomer components used to synthesize the acrylic polymer.

[0082] In another preferred embodiment, the acrylic polymer comprises an acrylic block copolymer. The acrylic block copolymer may exhibit the properties of a thermoplastic polymer (typically a thermoplastic elastomer). A PSA containing such an acrylic block copolymer as a base polymer may be suitable for hot-melt coating. The use of a hot-melt PSA for forming the PSA layer is preferred from the viewpoints of productivity and reducing environmental impact. From the viewpoint of reducing melt viscosity, etc., an acrylic block copolymer with a linear structure is advantageous over a star structure or a branched structure.

[0083] The acrylic block copolymer preferably has, for example, at least one acrylate block (hereinafter also referred to as Ac block) and at least one methacrylate block (hereinafter also referred to as MAc block) in one molecule. The Ac block is composed of monomer units derived from alkyl acrylates, accounting for approximately 50% by weight or more, preferably approximately 75% by weight or more, of all monomer units constituting the Ac block. The MAc block is composed of monomer units derived from alkyl methacrylates, accounting for approximately 50% by weight or more, preferably approximately 75% by weight or more, of all monomer units constituting the MAc block.

[0084] Examples of alkyl acrylates that make up the Ac block include C 1-20 Alkyl acrylate is one example. The constituent monomer units are C 4-14 The Ac block containing alkyl acrylate is preferred, and C 4-9 An Ac block containing alkyl acrylate is more preferred. 4-9 Suitable examples of alkyl acrylates include BA, 2EHA, n-hexyl acrylate, n-octyl acrylate, isooctyl acrylate (IOA), n-nonyl acrylate, and isononyl acrylate (INA). For example, an Ac block containing at least one of BA and 2EHA is preferred.

[0085] In a preferred embodiment, among the monomer units constituting the Ac block, C4-14 The proportion of alkyl acrylate is, for example, 50% by weight or more, or may be 75% by weight or more, or may be substantially 100% by weight (for example, more than 99% by weight but not more than 100% by weight). For example, the Ac block may preferably be made up of a monomer unit consisting essentially of BA alone, a monomer unit consisting essentially of 2EHA alone, or a monomer unit consisting of both BA and 2EHA. In an embodiment in which the Ac block contains both BA and 2EHA, the weight ratio of BA to 2EHA is not particularly limited. The weight ratio of BA / 2EHA is, for example, 10 / 90 to 90 / 10, preferably 80 / 20 to 20 / 80, more preferably 30 / 70 to 70 / 30, and may be 60 / 40 to 40 / 60.

[0086] The alkyl methacrylate constituting the MAc block is C 1-20 (Preferably C 1-14 ) alkyl methacrylate. Among the monomers that make up the MAc block, C 1-4 (Preferably C 1-3 The proportion of alkyl methacrylate may be, for example, approximately 50% by weight or more, approximately 75% by weight or more, or substantially 100% by weight (for example, more than 99% by weight but not more than 100% by weight). Among these, preferred alkyl methacrylates include methyl methacrylate (MMA) and ethyl methacrylate (EMA). For example, a configuration in which the monomer unit is substantially solely MMA, a configuration in which the monomer unit is solely EMA, or a configuration consisting of both MMA and EMA can be preferably employed.

[0087] In one embodiment, C 6-12 Alkyl acrylate and C 2-5An acrylic block copolymer having an Ac block composed of monomer units containing 2EHA and BA in the above weight ratio can be used. The Ac block may be composed of monomer units containing 2EHA and BA in the above weight ratio. The Ac block may be composed of only 2EHA and BA.

[0088] The weight ratio of Ac block / MAc block in the acrylic block copolymer is not particularly limited and may be, for example, 4 / 96 to 90 / 10, 7 / 93 to 70 / 30, 10 / 90 to 50 / 50, 15 / 85 to 40 / 60, or 15 / 85 to 25 / 75. In an acrylic block copolymer containing two or more MAc blocks, the weight ratio of the total weight of those MAc blocks to the Ac block is preferably within the above range. The same applies to an acrylic block copolymer containing two or more Ac blocks.

[0089] The acrylic block copolymer may contain a monomer (other monomer) other than alkyl (meth)acrylate. Examples of the other monomer include vinyl compounds having functional groups such as alkoxy, epoxy, hydroxyl, amino, amide, cyano, carboxy, and acid anhydride groups; vinyl esters such as vinyl acetate; aromatic vinyl compounds such as styrene; and vinyl group-containing heterocyclic compounds such as N-vinylpyrrolidone. The content of the other monomer may be approximately 20% by weight or less, approximately 10% by weight or less, or approximately 5% by weight or less of the total monomer components constituting the acrylic block copolymer. In a preferred embodiment, the acrylic block copolymer is substantially free of the other monomer. For example, an acrylic block copolymer having a content of the other monomer of less than 1% by weight (typically 0 to 0.5% by weight) or below the detection limit of the total monomer components is preferred.

[0090] Such acrylic block copolymers can be easily synthesized by known methods (see, for example, JP-A Nos. 2001-234146 and 1999-323072), or are readily available as commercially available products. Examples of such commercially available products include the "Clarity" series manufactured by Kuraray Co., Ltd. (e.g., those with product numbers LA2140e, LA2250, etc.) and the "NABSTAR" series manufactured by Kaneka Corporation.

[0091] The acrylic pressure-sensitive adhesive can contain a tackifier as needed. Examples of the tackifier include various tackifier resins, such as those commonly used for rosin, terpene, hydrocarbon, epoxy, polyamide, elastomer, phenol, and ketone applications, and can be used singly or in combination. The amount of tackifier resin per 100 parts by weight of base polymer may be, for example, approximately 1 part by weight or more, approximately 5 parts by weight or more, or approximately 10 parts by weight or more. To avoid a decrease in low-temperature properties, the amount of tackifier per 100 parts by weight of base polymer is typically approximately 50 parts by weight or less, and may be approximately 30 parts by weight or less, approximately 20 parts by weight or less, or approximately 10 parts by weight or less. The pressure-sensitive adhesive need not substantially contain a tackifier.

[0092] Acrylic adhesives can contain plasticizers as needed. Plasticizers can be useful for suppressing adhesive strength and reducing melt viscosity. Examples of plasticizers include phthalate esters such as dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, and dibutyl phthalate; adipic acid esters such as dioctyl adipate and diisononyl adipate; trimellitic acid esters such as trioctyl trimellitate; sebacic acid esters; epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil; epoxidized fatty acid alkyl esters such as epoxidized fatty acid octyl esters; cyclic fatty acid esters and derivatives thereof such as sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, and ethylene oxide adducts thereof. Softeners such as process oils are also included in the plasticizer category. Plasticizers can be used alone or in combination. The amount of plasticizer used is not particularly limited, and can be, for example, about 1 part by weight or more, about 5 parts by weight or more, about 7 parts by weight or more, or about 10 parts by weight or more per 100 parts by weight of base polymer. Furthermore, from the viewpoint of preventing contamination of the surface to be cleaned, the amount of plasticizer used per 100 parts by weight of base polymer is suitably about 100 parts by weight or less, and may also be about 50 parts by weight or less, about 30 parts by weight or less, or about 10 parts by weight or less. The adhesive need not substantially contain a plasticizer. It should be noted that adhesives other than acrylic adhesives (for example, rubber-based adhesives) may also contain an appropriate amount of the above-mentioned plasticizers, if necessary.

[0093] The acrylic pressure-sensitive adhesive may further contain various additives such as antioxidants, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, colorants (pigments, dyes, etc.), etc. The types and amounts of these additives may be the same as those typically used in the field of general pressure-sensitive adhesives.

[0094] <Application> The cleaning sheet disclosed herein can be used to clean various surfaces to be cleaned. For example, by taking advantage of its feature of being able to accurately remove both liquid and solid foreign matter that may be present on the surface to be cleaned, it can be preferably used to clean floors and walls in washrooms, dressing rooms, modular baths, toilets, kitchens, etc.

[0095] The matters disclosed by this specification include the following: [1] A cleaning sheet having a first surface and a second surface, A substrate having a water-absorbing layer on at least the front surface thereof, and a pressure-sensitive adhesive partially disposed on the water-absorbing layer, the first surface includes a cleaning surface having a first region where the adhesive is exposed and a second region where the water absorption layer is exposed; Water absorption: 0.5g / dm 2 That's it, cleaning sheets. [2] The cleaning sheet according to [1] above, wherein the cleaning surface is configured as an adhesive sheet having an adhesive surface. [3] The cleaning sheet according to [1] or [2] above, wherein the substrate further includes a waterproof layer disposed on the back side of the water-absorbing layer. [4] The cleaning sheet according to [3] above, wherein at least the back side of the waterproof layer is made of a polyolefin resin. [5] The cleaning sheet according to [3] or [4] above, wherein the back surface of the substrate is formed of a waterproof layer. [6] The cleaning sheet according to any one of [3] to [5] above, wherein the interlayer strength between the waterproof layer and the water-absorbing layer is 0.5 N / 25 mm or more. [7] The cleaning sheet according to any one of the above [1] to [6], which has a tear strength of 1.0 N or more. [8] The cleaning sheet according to any one of [1] to [7] above, which has a slit extending in a direction intersecting the longitudinal direction of the cleaning sheet. [9] The cleaning sheet according to any one of [1] to [8] above, which is wound with the cleaning surface facing outward to form a cleaning roll.

[10] The cleaning sheet according to any one of the above [1] to [9], wherein the water-absorbing layer is porous.

[11] The cleaning sheet according to any one of [1] to

[10] above, wherein the water-absorbing layer is a nonwoven fabric.

[12] The cleaning sheet according to

[11] above, wherein the water-absorbing layer is a cotton nonwoven fabric.

[13] The cleaning sheet according to any one of [1] to

[12] above, wherein the area ratio (adhesive area ratio) of the first region to the cleaning surface is 5% or more and 95% or less, 15% or more and 85% or less, or 35% or more and 75% or less.

[14] The cleaning sheet according to any one of [1] to

[13] above, wherein the first regions are provided in a striped pattern.

[15] The cleaning sheet according to any one of [1] to

[14] above, wherein the adhesive strength of the cleaning surface to SUS is 0.1 N / 25 mm or more and 5 N / 25 mm or less.

[16] The cleaning sheet according to any one of the above [1] to

[15] , wherein the adhesive is a rubber-based adhesive or an acrylic-based adhesive.

[17] The cleaning sheet according to

[16] above, wherein the adhesive is a rubber-based adhesive (for example, an SIS-based adhesive).

[18] A cleaning roll on which the cleaning sheet according to any one of [1] to

[17] is wound with the cleaning surface facing outward; a jig that supports the cleaning roll so that it can roll; Equipped with a cleaner. [Example]

[0096] Hereinafter, several examples of the present invention will be described, but it is not intended that the present invention be limited to the specific examples shown.

[0097] <Example 1> Nonwoven fabric F1 (Nisshinbo Textile "Oikos AP2040", a cotton nonwoven fabric manufactured by the spunlace method, basis weight 40 g / m 2 A 160 mm wide substrate S1 was prepared, in which a 20 μm thick polyethylene (PE) sheet was laminated to the back of a nonwoven fabric (water-absorbent), and the PE sheet surface was further subjected to a release treatment with a silicone-based release agent. A molten SIS-based adhesive was applied in stripes to the nonwoven fabric surface (front surface) of this substrate S1, forming a cleaning surface (adhesive area ratio 50%) with alternating 1 mm wide adhesive-coated areas (first areas) and 1 mm wide adhesive-uncoated areas (second areas). The adhesive coating range (width of the cleaning surface) was 150 mm, and a 5 mm range from each end of the width of the substrate S1 was left as a dry edge where no adhesive was coated. The amount of adhesive to be coated was determined based on the area of ​​1 m of the substrate S1 in the coating range. 2 The adhesive strength of the cleaning surface (adhesive surface) to SUS was adjusted to be within the range of 0.1 to 1.0 N / 25 mm, with a target weight of about 15 to 25 g per sheet. In this way, the cleaning sheet of Example 1 was produced.

[0098] <Example 2> Nonwoven fabric F2 (Nisshinbo Textile "Oikos AP2050", a cotton nonwoven fabric manufactured by the spunlace method, basis weight 50 g / m 2 A 160 mm wide substrate S2 was prepared, in which a 20 μm thick PE sheet was laminated on the back of a nonwoven fabric (absorbent, water-absorbent) and the surface of the PE sheet was further treated with a silicone release agent. A cleaning sheet according to this example was produced in the same manner as in Example 1, except that substrate S2 was used instead of substrate S1.

[0099] <Example 3> Nonwoven fabric F3 (Futamura Chemical Co., Ltd. "#404WJ", a rayon nonwoven fabric manufactured by the wet short fiber spunbond method, basis weight 40 g / m 2A 160 mm wide substrate S3 was prepared, in which a 20 μm thick PE sheet was laminated to the back of a nonwoven fabric (absorbent, water-absorbent) and the surface of the PE sheet was further treated with a silicone release agent. A cleaning sheet according to this example was produced in the same manner as in Example 1, except that substrate S3 was used instead of substrate S1.

[0100] <Examples 4 and 5> Cleaning sheets according to Examples 4 and 5 were prepared in the same manner as in Examples 1 and 3, respectively, except that the adhesive coating pattern was changed to dots with a diameter of about 3 mm (grid point arrangement, adhesive area ratio 60%).

[0101] <Example 6> Nonwoven fabric F6 (Maeda Kosen's polypropylene (PP) nonwoven fabric "SP-1040E", basis weight 40 g / m 2 A 160 mm wide, long substrate S6 was prepared, in which a PET film (10 μm thick) and a PE sheet (20 μm thick) were laminated in this order on the back of a non-water-absorbent substrate (with the PE sheet surface further subjected to a release treatment with a silicone-based release agent).A cleaning sheet according to this example was produced in the same manner as in Example 1, except that substrate S6 was used instead of substrate S1.

[0102] <Examples 7-9> For the cleaning sheets of Examples 7 to 9, the substrates S1 to S3 used in producing the cleaning sheets of Examples 1 to 3 were used as they were (that is, without applying any adhesive to the nonwoven fabric surface of the substrate).

[0103] <Example 10> The cleaning sheet according to this example is made of nonwoven fabric F10 (PP nonwoven fabric "Eltas PO3040" manufactured by Asahi Kasei Corporation, basis weight 40 g / m 2 A 160 mm wide, long substrate S10 was used as it was (i.e., without applying any adhesive to the nonwoven fabric surface of the substrate). The substrate S10 had a 20 μm thick PE sheet laminated on the back of a nonwoven fabric (non-water-absorbent) and the PE sheet surface was further subjected to a release treatment with a silicone-based release agent.

[0104] <Production of cleaning roll> The cleaning sheet according to each example was wound around a cylindrical cardboard core having an outer diameter of 38 mm for approximately 50 turns, with the nonwoven fabric side of the substrate facing outwards, to produce a cleaning roll according to each example.

[0105] <Evaluation> 1. Water absorption measurement A cleaning sheet was pulled out from the cleaning roll of each example, and three square test pieces, each 10 cm on a side, were taken. The weight of the test piece (weight before water absorption) was measured, and the test piece was immersed in water for 1 minute with the nonwoven fabric side of the substrate facing downwards. The test piece was then removed from the water and hung in the air for at least 1 minute to drip the water off, after which the weight (weight after water absorption) was measured. The difference between the weight after water absorption and the weight before water absorption was calculated for each test piece, and the average value of the three test pieces was used as the water absorption amount [g / dm 2 ] are shown in Table 1.

[0106] 2. Cleaning performance [Water removal performance] The surface to be cleaned was an unwaxed flooring material (manufactured by Eidai Sangyosha, "DXRD-1451UR," rectangular, 30 cm wide and 90 cm long; the same applies below). Water was sprayed five times using a spray bottle. The amount sprayed per time was approximately 0.5 g, and red-tinted water was used to make it easier to visually assess the extent of water removal. The cleaning roll for each example was then attached to the rotating part 52 of a jig 50, roughly shaped as shown in Figures 3 and 4, and the cleaning roll was run back and forth once on the right half of the surface to be cleaned, followed by one run on the left half. Water removal performance was evaluated using the following three levels. The results are shown in Table 1. E (Excellent): Almost all water was removed (excellent water removal performance). G (Good): Some water remains, but most of the water was removed (good water removal performance). P (Poor): Water could not be removed (poor water removal performance).

[0107] [Hair removal performance (without water)] After scattering 10 hairs, each approximately 5 cm long, onto the dry surface to be cleaned, the cleaning roll according to each example was attached to the rotating part 52 of a jig 50, roughly shaped as shown in Figures 3 and 4, and was rolled back and forth once on the right half of the surface to be cleaned, and then once on the left half. This test was carried out 10 times, and the percentage of the total number of hairs removed out of the total number of hairs used (100) is shown in Table 1. A higher value indicates better removal performance. An evaluation result of 100% means that all 100 hairs were removed.

[0108] [Hair removal performance (with water)] Ten hairs, each approximately 5 cm long, were scattered onto the dry surface to be cleaned, and then water was sprayed five times using a spray bottle (approximately 0.5 g per spray). The cleaning roll according to each example was then attached to the rotating part 52 of a jig 50, roughly shaped as shown in Figures 3 and 4, and moved back and forth once across the right half of the surface to be cleaned, and then once across the left half. This test was performed 10 times, and the percentage of the total number of hairs removed out of the total number of hairs used (100) is shown in Table 1. A higher value indicates better removal performance. An evaluation result of 100% means that all 100 hairs were removed.

[0109] 3.Interlaminar strength A cleaning sheet was pulled out from the cleaning roll of each example and cut into a 25 mm wide strip to prepare a test piece. The longitudinal direction of the test piece was aligned with the length of the cleaning sheet. In preparation for measurement, the laminate layer (waterproof layer) was manually peeled off from the nonwoven fabric at one end of the longitudinal direction of the test piece. Next, a tensile tester was used to measure the interlayer strength by clamping the nonwoven fabric side and the laminate layer side of the peeled portion with a chuck and conducting a T-peel test at a tensile speed of 300 mm / min. The results are shown in Table 1. For cleaning sheets of Examples 2, 4, and 8, the laminate layer could not be peeled off by hand from the nonwoven fabric at one end of the longitudinal direction of the test piece in preparation for measurement, so the column indicating interlayer strength was marked "Not measurable." These cleaning sheets are considered to have sufficiently high interlayer strength for practical use.

[0110] Furthermore, for the cleaning rolls of Examples 1, 4, and 7, which used the same substrate S1, the above-mentioned water removal test was carried out, and then the cleaning sheets constituting the outermost periphery of the cleaning rolls (i.e., the cleaning sheets that had absorbed water in the above-mentioned water removal test) were similarly subjected to a simple evaluation of the interlayer strength between the nonwoven fabric and the laminate layer by manual peeling. As a result, it was found that the interlayer strength of the cleaning sheet of Example 7 tended to decrease significantly due to water absorption compared to the cleaning sheets of Examples 1 and 4. This indicates that the adhesive partially coated on the nonwoven fabric contributes to suppressing the decrease in interlayer strength due to water absorption.

[0111] 4.Tear strength A cleaning sheet was pulled out from the cleaning roll of each example and cut into a 50 mm wide strip to prepare a test piece. The longitudinal direction of the test piece was aligned with the length of the cleaning sheet. A slit was made in the test piece along the center of its width from one end of the length to the middle. Using a tensile tester, the cleaning sheet was gripped at one end of the length on the right and left sides of the slit with a chuck and pulled in a T-shape at a pulling rate of 300 mm / min, thereby measuring its tear strength. The results are shown in Table 1.

[0112] 5.Efficiency in updating the outer peripheral surface (adhesive surface) After evaluating the hair removal performance (without water) using the method described above, the outer periphery of the cleaning sheet was turned over around the cleaning roll with the hair still attached, and it was evaluated whether vertical tears occurred in the cleaning sheet due to the attached hair. The test was carried out 10 times, and the replacement workability was evaluated according to the number of times vertical tears occurred, using the following two levels. G (good): Vertical cracks occurred 0 or 1 time (good renewability). A (acceptable): Vertical cracks occurred 2 to 4 times (possible for practical renewal work).

[0113] [Table 1]

[0114] As shown in Table 1, the adhesive was partially disposed on the water-absorbent nonwoven fabric, and the water absorption capacity was 0.5 g / dm 2 The cleaning sheets of Examples 1 to 5 had good water removal properties and were able to effectively remove hair not only from dry surfaces to be cleaned, but also from wet surfaces. The cleaning sheets of Examples 1, 2, and 4 had greater tear strength than the cleaning sheets of Examples 3 and 5, and showed better adhesive surface renewal workability in the form of a cleaning roll. On the other hand, the cleaning sheet of Example 6, which had a non-water-absorbent nonwoven fabric with a partially disposed adhesive and had a low water absorption capacity, was unable to remove water, and the cleaning sheets of Examples 7 to 10, which had no adhesive, were unable to remove hair.

[0115] Although specific examples of the present invention have been described above in detail, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and alterations of the specific examples exemplified above. [Explanation of symbols]

[0116] 1 cleaning roll 10 Cleaning Sheets 10A 1st side 10B 2nd side 11 Cleaning surface 12, 13 Non-adhesive area 14 Cut 16 Winding outer edge (turning opening) 18 Lead Tape 20 Base material 22 Water absorption layer 24 Waterproof layer 31 Adhesive (first area) 32 Exposed water absorption layer (second area) 40 core 50 Jig 52 Rotating member 54 Gripping member 56 Cleaning surface 100 Cleaners W1 Width of the first area W2 Width of the second area

Claims

1. 1. A cleaning sheet having a first side and a second side, A substrate having a water absorption layer on at least the front surface thereof, and a pressure-sensitive adhesive partially disposed on the water absorption layer, the first surface includes a cleaning surface having a first region where the adhesive is exposed and a second region where the water absorption layer is exposed; Water absorption: 0.5g / dm ２ That's it, cleaning sheets.

2. The cleaning sheet according to claim 1 , wherein the cleaning surface is an adhesive sheet.

3. The cleaning sheet according to claim 1 or 2, wherein the substrate further comprises a waterproof layer disposed on the back side of the water-absorbing layer.

4. 4. The cleaning sheet according to claim 3, wherein the interlayer strength between the waterproof layer and the water-absorbing layer is 0.5 N / 25 mm or more.

5. 5. The cleaning sheet according to claim 1, which has a tear strength of 1.0 N or more.

6. 6. The cleaning sheet according to claim 1, wherein the cleaning sheet has a slit extending in a direction intersecting the longitudinal direction of the cleaning sheet.

7. 7. The cleaning sheet according to claim 1, wherein the cleaning sheet is wound with the cleaning surface facing outward to form a cleaning roll.

8. a cleaning roll on which the cleaning sheet according to any one of claims 1 to 6 is wound with the cleaning surface facing outward; a jig that supports the cleaning roll so that the cleaning roll can roll; Equipped with a cleaner.

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