Cleaning sheet, laminate of cleaning sheets, cleaning tool, and method for manufacturing a cleaning sheet.

Abstract

To provide a cleaning sheet, etc., which are at least provided with superior dust trapping ability.SOLUTION: A cleaning sheet is formed of a cleaning surface which is to be in sliding contact with the surface of a body to be cleaned. The cleaning surface is provided with irregularity, with the tip of a protrusion in sliding contract with the body to be cleaned. The protrusion is formed so that a space is made in the surface direction of the cleaning surface. The cleaning surface has higher adhesion than the protrusion and is further provided with an adhesive recess which is exposed on the cleaning surface. The adhesive recess is provided with an adhesive layer, and the rate of the exposed area of the adhesive layer in the cleaning surface is 30% or more. A ratio H / L, between the average protrusion height H from the tip of the protrusion to the adhesive recess and an average length L of the shape of the adhesive recess in a first direction in which the average length of the space in the surface direction is minimized, is 15×10-3 or higher.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cleaning sheet, a laminate of cleaning sheets, a cleaning tool including a cleaning sheet, and a method for manufacturing a cleaning sheet.

Background Art

[0002] Various cleaning tools (wiping tools) for cleaning floor surfaces such as flooring are widely known. This type of cleaning tool includes, for example, a head attached to the end of a rod-shaped handle and a cleaning sheet that is detachable from the head, and the cleaning sheet is fixed to the head for use (Patent Document 1). The cleaning tool described in Patent Document 1 can capture dust (object to be removed) on the object to be cleaned by sliding one side (cleaning surface) of the above-mentioned cleaning sheet in contact with the surface of the object to be cleaned such as the floor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The cleaning sheet used by being fixed to the cleaning tool described in Patent Document 1 includes a fiber sheet in which fibers are aggregated. Specifically, the cleaning sheet described in Patent Document 1 includes an outermost fiber sheet in which a plurality of holes penetrating in the thickness direction are formed, and an adhesive layer overlapping the fiber sheet. According to the cleaning sheet described in Patent Document 1, dust can be scraped and captured by utilizing the fine fiber structure of the fiber sheet. Further, if the dust enters the above-mentioned holes, the entered dust can be captured by the adhesive force on the surface of the adhesive layer, and the captured state can be maintained. However, in the cleaning sheet described in Patent Document 1, since holes are simply formed in the fiber sheet, it cannot be said that the adhesive layer can effectively capture dirt in the depressions of the holes. In other words, the performance of the adhesive layer in the holes in capturing dirt is not necessarily good. Therefore, conventional cleaning sheets, such as those in Patent Document 1, have the problem of not having good dust-catching ability.

[0005] In view of the above-mentioned problems, the present invention aims to provide a cleaning sheet having at least good dust-catching ability, and a cleaning tool equipped with the cleaning sheet. [Means for solving the problem]

[0006] The cleaning sheet according to the present invention is a cleaning sheet having a cleaning surface formed thereon that is rubbed against the surface of the object to be cleaned, The cleaning surface has an uneven surface, and is used by sliding the tip of the protrusions against the object to be cleaned. The aforementioned protrusions are composed of members formed so as to be spaced apart in the planar direction of the cleaning surface. The cleaning surface has a higher adhesive strength than the member and further has adhesive recesses exposed on the cleaning surface, The cleaning surface comprises an adhesive layer that extends in the planar direction and is arranged in at least a portion of the spacing between the members, wherein at least a portion of the adhesive layer constitutes the adhesive recess, and the ratio of the exposed area of ​​the adhesive layer on the cleaning surface is 30% or more. The ratio (H / L) of the average height of the protrusion (H: mm) from the tip of the protrusion to the adhesive recess and the average length of the shape of the adhesive recess in the first direction where the average length of the interval is minimized in the surface direction is 15 × 10 -3 That's all.

[0007] The cleaning sheet with the above configuration has a cleaning surface with irregularities, and is mainly used by sliding the tips of the protrusions against the object to be cleaned. Since the exposed area of ​​the adhesive layer is 30% or more, dirt can be sufficiently captured by the adhesive recesses. In addition, the ratio (H / L) of the average height of the protrusions (H: mm) to the average length of the shape of the adhesive recesses (L: mm) is 15 × 10 -3 As described above, contact between the adhesive recess and the surface of the object to be cleaned is suppressed, while the tip of the protrusion can slide against it. Therefore, while sliding the protrusion against the object to be cleaned, debris can be drawn into the gaps between the members constituting the protrusion. Since adhesive recesses, which are more recessed than the protrusions and have relatively higher adhesive strength, are arranged in these gaps, the drawn-in debris can be captured by these adhesive recesses. Moreover, the captured debris can be held on the surface of the adhesive recesses by their adhesive strength. Therefore, the cleaning sheet described above has good debris-capturing ability.

[0008] In the above-described cleaning sheet, the proportion of the exposed area of ​​the adhesive layer on the cleaning surface may be greater than 50%. This allows the above-described cleaning sheet to have better dust-catching ability.

[0009] In the above cleaning sheet, the average height of the protrusions (H) is 1000 × 10 -3 It is preferable that it is 500 × 10 mm or less. -3 It is more preferable that it be less than or equal to 300 × 10 -3 It is more preferable that the value be less than or equal to mm. The average height (H) of the aforementioned protrusion is 500 × 10 -3 By being less than a millimeter in size, the depth of the recess from the tip of the protrusion to the adhesive recess becomes shallower. Therefore, when in contact with the surface, the adhesive recess can get closer to the surface of the object being cleaned. As a result, the adhesive recess can capture dirt more easily and thoroughly. Consequently, the cleaning sheet described above has better dirt-capturing capabilities.

[0010] In the above-described cleaning sheet, the average length (L) of the shape of the adhesive recess in the first direction in which the average length of the intervals in the surface direction is minimized is preferably 0.3 mm or more, more preferably 0.5 mm or more, even more preferably 0.8 mm or more, and particularly preferably 1.0 mm or more. When the average length (L) of the shape of the adhesive recess is 0.3 mm or more, the average size of each adhesive recess becomes relatively large. Therefore, the adhesive recess can capture dirt more effectively. Consequently, the above-mentioned cleaning sheet has better dirt-catching properties.

[0011] In the above-described cleaning sheet, the minimum load of the load curve when the protruding member is measured by nanoindentation is preferably -0.40 μN or more and 0 μN or less, and more preferably -0.10 μN or more and 0 μN or less. In the above-described cleaning sheet, the minimum load of the unloading curve when the member of the protrusion is measured by nanoindentation is preferably -1.50 μN or more and 0 μN or less, and more preferably -0.10 μN or more and 0 μN or less. In the above-mentioned cleaning sheet, it is preferable that the static friction coefficient of the cleaning surface is 1.00 or less. These configurations allow the cleaning sheet to have better sliding properties.

[0012] The above cleaning sheet comprises an adhesive layer that extends in the planar direction of the cleaning surface and is positioned on the back side of the member, a portion of which constitutes the adhesive recess, the hardness of the member measured by nanoindentation is 0.4 MPa or higher, and the probe tack of the adhesive layer measured by probe tack is 1.0 kN / m 2 More than 500.0kN / m 2 The following is preferable: When the hardness of the member is 0.4 MPa or more, the frictional force between the convex portion that is in sliding contact with the surface of the object to be cleaned and the surface of the object to be cleaned can be made relatively small during the sliding contact. Therefore, a cleaning sheet having such a member with relatively high rigidity on the cleaning surface has good slipperiness. The probe tack of the adhesive layer is 1.0 kN / m 2 or more and 500.0 kN / m 2 or less, thereby enabling better dust capture performance. Therefore, when the hardness of the member constituting the convex portion is 0.4 MPa or more and, moreover, the probe tack of the adhesive layer is 1.0 kN / m 2 or more and 500.0 kN / m 2 or less, it is possible to exhibit good slipperiness while exhibiting better dust capture performance.

[0013] In the above cleaning sheet, it is preferable that the member of the convex portion contains at least one of wax, a cured resin, and inorganic powder.

[0014] In the above cleaning sheet, the member of the convex portion may contain at least one of a polyolefin resin, an ethylene-vinyl acetate copolymer resin (EVA), a styrene-based thermoplastic elastomer resin, an acrylic resin, a polyvinyl chloride resin, a polyester resin, a polyurethane resin, a polyimide resin, a polyamide resin, and a polycarbonate resin.

[0015] In the above cleaning sheet, the member of the convex portion may contain a extender pigment as the inorganic powder.

[0016] In the above cleaning sheet, the cleaning surface may be formed on both sides.

[0017] The method for manufacturing a cleaning sheet according to the present invention is the method for manufacturing the above cleaning sheet, characterized in that the member of the convex portion is formed by coating.

[0018] In the above-described method for manufacturing a cleaning sheet, the cleaning sheet may have a support base material, and the protruding member may be formed by coating and overlapping it with the support base material. Furthermore, in the above-described method for manufacturing the cleaning sheet, the cleaning sheet may have a support base material and an adhesive layer that overlaps the support base material, and the protruding member may be formed by coating it onto the adhesive layer.

[0019] The laminate of the present invention is in a state in which the above-mentioned cleaning sheet is wound around it, or The cleaning sheet described above is characterized by being stacked in the thickness direction.

[0020] The cleaning tool of the present invention comprises the above-mentioned cleaning sheet and a sheet fixing part to which the cleaning sheet is detachably attached. In the above-described cleaning tool, one of the cleaning sheets described above is detachably attached to the sheet fixing part. During cleaning, by operating the sheet fixing part in the same way as operating a mop or floor wiper, the cleaning sheet attached to the sheet fixing part can be brought into contact with the surface of the object to be cleaned, thereby enabling efficient cleaning. [Effects of the Invention]

[0021] The cleaning sheet, the laminate of the cleaning sheet, and the cleaning tool of the present invention can have at least good dust-catching properties. The method for manufacturing the cleaning sheet of the present invention has the effect of being able to manufacture a cleaning sheet having good dust-catching properties. [Brief explanation of the drawing]

[0022] [Figure 1] A schematic diagram of a cleaning sheet according to one embodiment, viewed from one side (the cleaning side). [Figure 2A] A schematic diagram of a cross-section obtained by cutting a cleaning sheet according to one embodiment in the thickness direction (along the dashed line in Figure 1). [Figure 2B] A schematic cross-sectional view of a cleaning sheet according to another embodiment, cut in the thickness direction in the same manner as in Figure 2A. [Figure 3] A perspective view showing a schematic configuration of a cleaning tool to which a cleaning sheet is attached according to one embodiment. [Figure 4] A schematic diagram of a cleaning sheet according to another embodiment, viewed from one side (the cleaning side). [Figure 5] A schematic diagram of a cleaning sheet according to another embodiment, viewed from one side (the cleaning side). [Figure 6] A schematic diagram showing a cleaning sheet according to yet another embodiment, viewed from one side (the cleaning side). [Figure 7] A schematic diagram of a cleaning sheet according to a certain embodiment, viewed from one side (the cleaning side). [Figure 8] A schematic diagram showing a cross-section of cleaning sheets stacked in the thickness direction according to one embodiment. [Figure 9A] A schematic diagram illustrating the measurement process using the nanoindentation method. [Figure 9B] Schematic diagram of a measurement chart using the nanoindentation method. [Modes for carrying out the invention]

[0023] Hereinafter, one embodiment of the cleaning sheet and cleaning tool according to the present invention will be described in detail with reference to the drawings.

[0024] <Cleaning supplies> As shown in Figure 3, the cleaning tool 100 of this embodiment comprises a cleaning sheet 1, which will be described in detail later, and a sheet fixing part 120 for fixing the cleaning sheet 1. Furthermore, the cleaning tool 100 of this embodiment comprises a rod-shaped gripping member 110 that functions as a handle. The sheet fixing portion 120 is flat in shape to hold the cleaning surface 10 of the cleaning sheet 1 in a planar position, and is rotatably connected to one end of the gripping member 110 via a universal joint 130. In this embodiment, the sheet fixing portion 120 is flat and rectangular when viewed from one side in the thickness direction. The sheet fixing part 120 is configured such that, with the cleaning sheet 1 fixed in place, at least a portion of the cleaning surface 10 of the cleaning sheet 1 is brought into contact with the surface of the object to be cleaned by the operator, and the cleaning surface 10 is slid in one of the directions of the surface of the object to be cleaned.

[0025] In this embodiment, the cleaning sheet 1 is attached to the sheet fixing part 120, for example, as follows. Specifically, one side of the cleaning sheet 1 has a cleaning surface 10 that slides against the object to be cleaned and a non-cleaning surface 20 that does not slide against the object to be cleaned. The cleaning sheet 1 is placed on one side of the sheet fixing part 120 (the smooth surface that faces the object to be cleaned when in use) with the cleaning surface 10 facing outwards. The cleaning sheet 1 is folded back at the edges of the opposing long sides of the sheet fixing part 120, and the portion of the non-cleaning surface 20 is fixed to the other side of the sheet fixing part 120 (the side that does not face the object to be cleaned). In this embodiment, radial slits 140 are formed in a flexible member on the other side of the sheet fixing part 120. By pushing a portion of the non-cleaning surface 20 into these radial slits 140, the cleaning sheet 1 can be detachably fixed to the sheet fixing part 120. In this way, the cleaning sheet 1 is detachably attached to the sheet fixing part 120. The means of fixing the cleaning sheet 1 are not limited to those described above, and other known fixing methods such as clips can also be used. Alternatively, the cleaning sheet 1 may be attached to the sheet fixing part 120 using double-sided tape or the like. An adhesive layer may also be applied to the entire or partial back side of the cleaning sheet 1, and the adhesive layer may be attached to the sheet fixing part 120. Only one cleaning sheet 1 may be fixed to the sheet fixing part 120, or multiple cleaning sheets 1 may be fixed to the sheet fixing part 120 in a stacked state. When a cleaning sheet 1 becomes damaged or soiled from use, it can be easily removed from the sheet fixing part 120 when it needs to be replaced. The used cleaning sheet 1 can then be replaced with a new, unused cleaning sheet. When multiple cleaning sheets 1 are stacked and fixed to the sheet fixing part 120, if the outermost cleaning sheet 1 becomes dirty, it can be peeled off, for example, along the perforations, to expose a clean cleaning sheet 1.

[0026] The cleaning sheet 1 of this embodiment will be described in more detail with reference to the drawings.

[0027] <Cleaning Sheets> As shown in Figures 1 and 2A, the cleaning sheet 1 of this embodiment has a relatively thin thickness. The cleaning sheet 1 of this embodiment has a cleaning surface 10 that slides against the surface of the object to be cleaned. The cleaning surface 10 has an uneven surface, and is used by sliding the tip of the protrusion 12 against the object to be cleaned. The protrusion 12 is composed of a member 30 formed with a gap A in the planar direction of the cleaning surface 10. The cleaning surface 10 further has adhesive recesses 14 that have higher adhesive strength than the member 30 and are exposed on the cleaning surface 10. More specifically, the cleaning sheet 1 of this embodiment has a cleaning surface 10 that slides against the surface of the object to be cleaned. The cleaning surface 10 has an uneven shape. The cleaning sheet 1 of this embodiment comprises an adhesive layer 40 that constitutes at least a part of the bottom of the concave shape, and a component 30 of the convex shape that forms a convex portion and has lower adhesive strength than the adhesive layer 40. The component 30 of the convex shape is configured such that a gap is formed in at least one direction of the surface direction of the cleaning surface 10, and the concave shape is arranged in the gap. In the cleaning sheet 1 of this embodiment, a convex portion 12 is formed on the cleaning surface 10 by arranging the component 30 of the convex shape to protrude beyond the adhesive layer 40. In addition, an adhesive recess 14 is formed by arranging at least a part of the adhesive layer 40 at the bottom of the concave shape. In the adhesive recess 14, at least a part of the adhesive layer 40 is exposed to the cleaning surface 10. The cleaning sheet 1 of this embodiment includes an adhesive layer 40 that extends in the planar direction of the cleaning surface 10 and is positioned in at least a portion of the spacing between the members 30. At least a portion of the adhesive layer 40 constitutes an adhesive recess 14, and the ratio of the exposed area of ​​the adhesive layer 40 on the cleaning surface 10 is 30% or more. The ratio (H / L) of the average height of the protrusion (H: mm) from the tip of the protrusion 12 to the adhesive recess 14 and the average length (L: mm) of the shape of the adhesive recess 14 in the first direction where the average length of the spacing in the above surface direction is minimized is 15 × 10 -3 That's all.

[0028] As shown in Figure 2A, the cleaning sheet 1 of this embodiment comprises the member 30 that slides against the object to be cleaned, a support base material 50, and an adhesive layer 40 disposed between the member and the support base material 50. In other words, the cleaning sheet 1 of this embodiment includes a support base material 50 that faces the gripping member 110 when fixed to the cleaning tool 100, an adhesive layer 40 superimposed on a part of the surface of the support base material 50, and the above-mentioned member 30 superimposed on the surface of the adhesive layer 40. More specifically, the adhesive layer 40 is arranged to cover at least the central portion of one side of the support base material 50, and the above-mentioned member 30 is arranged to overlap one side of the adhesive layer 40 (the side facing the object to be cleaned). Note that in Figure 2A, the number of the above-mentioned components 30 is fewer than in Figure 1 for the sake of clarity.

[0029] As shown in Figures 1 and 2A, the cleaning sheet 1 of this embodiment has a cleaning surface 10 formed on one side (the side that faces outward when fixed to the sheet fixing part 120) that slides against the surface of the object to be cleaned, such as a floor. The cleaning sheet 1 may also have a non-cleaning surface 20, as in this embodiment. In this embodiment, the cleaning surface 10 is formed by a convex portion 12 and a part of the adhesive layer 40 (adhesive recess 14), while the non-cleaning surface 20 is formed by the surface of the support base material 50. The non-cleaning surface 20 may also be formed by one or more release layers placed on the surface of the support base material 50. As shown in Figure 1, when the rectangular cleaning sheet 1 is viewed from one side, one cleaning surface 10 is positioned between two opposing strip-shaped non-cleaning surfaces 20. In other words, the rectangular cleaning surface 10 is positioned so as to be sandwiched between the two strip-shaped non-cleaning surfaces 20. The cleaning surface 10 may be formed on only one side of the cleaning sheet 1, as described above, or it may be formed on both sides.

[0030] In this embodiment, the component 30 of the protrusion has a plurality of linear members. The cleaning surface 10 of the cleaning sheet 1 has a protrusion 12 made up of a component (component 30 of the protrusion) in which a plurality of linear members are arranged with a gap A in the planar direction. The cleaning surface 10 also has an adhesive recess 14 as described above. In this embodiment, the convex component 30 has a plurality of linear members. The plurality of linear members are arranged in contact with the surface of the adhesive layer 40. The plurality of linear members are arranged with a spacing A along one direction in the planar direction of the cleaning surface 10. The parallel plurality of linear members extend in the same direction as the longitudinal direction of the strip-shaped non-cleaning surface 20. The adhesive layer 40 in the adhesive recess 14 has higher adhesive strength than the component member 30 of the protrusion. Also, at least a portion of the adhesive layer 40 is exposed to the cleaning surface 10. In this embodiment, the adhesive recess 14 is positioned at the above-mentioned interval A and is recessed from the tip of the protrusion 12 by the protruding height of the protrusion 12. At least a portion of the adhesive layer 40 is exposed and forms the bottom of the adhesive recess 14. With the above configuration, the cleaning sheet 1 is used by primarily sliding the tip of the protrusion 12 into contact with the object to be cleaned. When sliding contact occurs, debris can be drawn into the gap A separating adjacent linear members. Since adhesive recesses 14, which have relatively high adhesive strength and are recessed compared to the protrusions, are arranged in the gap A, the adhesive layer 40 in the adhesive recesses 14 can capture the drawn-in debris. Moreover, even if the captured debris is relatively heavy, it can be held on the surface of the adhesive recesses 14 by the adhesive force. Therefore, the above cleaning sheet has good debris-capturing ability. Furthermore, with the above configuration, although the adhesive layer 40 has relatively strong adhesive force, the adhesive recess 14 is recessed more than the tip of the convex portion 12. Therefore, the cleaning surface 10 is not significantly affected by the frictional force due to the adhesive force of the adhesive layer 40, and is mainly slid into contact with the surface of the object to be cleaned, with the tip of the convex portion 12 making contact. Thus, the cleaning sheet 1 has good sliding properties.

[0031] The static friction coefficient of the cleaning surface (relative to the SUS304 plate) is preferably 3.00 or less, more preferably 1.50 or less, and even more preferably 1.00 or less. This allows for better sliding properties. However, such a static friction coefficient may be 0.20 or more. The static friction coefficient is measured in accordance with the measurement conditions described in JIS K7125:1999 (ISO 8295:1995). The measurement temperature is 23°C. Similarly, the coefficient of kinetic friction can be determined. For measuring the coefficient of friction, a SUS304 steel plate (100 x 200 mm) used in JIS Z 0237:2009 is used. An 80 x 160 mm sheet, cut from a cleaning sheet, is placed on top of this SUS304 steel plate so that the cleaning surface is in contact with the SUS steel plate surface, with a contact area of ​​40 cm². 2A sliding piece (with a side length of 63 mm) is placed on the load cell. The total mass of the sliding piece is adjusted to 200 g. The speed for measuring the coefficient of friction is 100 mm / min, and the static and dynamic coefficients of friction are calculated from the maximum force over a measurement distance of 60 mm. The average values ​​of 5 measurements are recorded for each. Note that when measuring the static coefficient of friction, the auxiliary plate is connected to the load cell via a spring, but the spring is not used when measuring the dynamic coefficient of friction. Furthermore, the static and dynamic friction coefficients mentioned above can be reduced, for example, by increasing the ratio (H / L) described later. Here, the ratio (H / L) is the ratio (H: mm) of the average height of the protrusions from the tip of the protrusion 12 to the adhesive recess 14, and the average length (L: mm) of the shape of the adhesive recess in the first direction in the surface direction of the cleaning surface at which the average length of the above-mentioned interval is minimized.

[0032] (Methods that constitute the protrusion) In this embodiment, the member 30 constituting the protrusion has a plurality of parallel linear members. A portion of the adhesive layer 40 is exposed at the interval A between adjacent linear members. As a result, debris that accumulates near the adhesive recess 14 due to sliding contact is captured by the adhesive layer 40, and the capture of the debris can be maintained by the adhesive force of the adhesive recess 14. Therefore, good debris capture performance is achieved.

[0033] The width of the wire members described above is usually 0.01 mm or more. More preferably, the width of the wire members is 0.02 mm or more, even more preferably 0.03 mm or more, and particularly preferably 0.1 mm or more. The width of the wire members may be 20 mm or less, 10 mm or less, 5 mm or less, or 1 mm or less. When a protrusion is formed by multiple parallel wire members, or when a protrusion is formed by multiple intersecting wire members, it is preferable that the width of the wire members be within the above range.

[0034] The hardness of the member 30 constituting the protrusion is measured by nanoindentation. Preferably, this hardness is 0.4 MPa or higher. This hardness of 0.4 MPa or higher allows for relatively small frictional forces between the protrusion 12, which slides against the surface of the object to be cleaned, and the surface of the object to be cleaned during sliding contact. Therefore, a cleaning sheet 1 having such a relatively rigid member on its cleaning surface 10 exhibits good sliding properties. Furthermore, by constructing the protrusion 12 with such a relatively rigid member, wear of the member due to sliding contact during cleaning is suppressed, allowing the cleaning sheet 1 to exhibit good durability. The hardness of the component member 30 of the protrusion is preferably 0.4 MPa or higher, more preferably 1.5 MPa or higher, even more preferably 3.0 MPa or higher, particularly preferably 5.0 MPa or higher, and most preferably 10.0 MPa or higher. The upper limit of the hardness of the component is not particularly limited, and the hardness of the component may be 200 MPa or lower. In order to provide the component 30 with appropriate deformability and to suppress the occurrence of scratches on the surface of the object to be cleaned by the protrusion 12, the hardness of the component 30 is preferably 100 MPa or lower, more preferably 70 MPa or lower, and particularly preferably 50 MPa or lower.

[0035] The hardness of the above-mentioned component 30 by the nanoindentation method is measured in accordance with ISO 14577. Specifically, it is measured using the measuring device "TI950 TriboIndenter" (Hysitron). More specifically, it is calculated by dividing the "load when the indenter is pressed in to the deepest point (maximum load Pmax)" by the "contact area between the indenter and the sample being measured (contact projected area B)". A Berkovich-type diamond indenter (triangular pyramidal indenter) is used as the indenter, and the measurement is performed in a single indentation measurement. To ensure that the measured value is not affected by anything other than the above-mentioned component 30, it is desirable that the thickness of the above-mentioned component 30 at the time of measurement be at least 50 μm. The indentation speed of the indenter is 500 nm / second, and the withdrawal speed is 500 nm / second. The indentation depth of the indenter is 5 μm. The measurement is performed at 25°C. At least three measurements are taken and the average value is obtained. The examples described later are measured in the same manner.

[0036] The elastic modulus of the above member 30 obtained by the nanoindentation method may be, for example, 4.5 MPa to 1000 MPa, 4.5 MPa to 500 MPa, or 4.5 MPa to 200 MPa. Such an elastic modulus is calculated based on the results measured in the same manner as the hardness measurement of the above member 30. However, such an elastic modulus is calculated using the following formula, with respect to the "slope of the tangent line at maximum load of the unloading curve (tangential stiffness S = dP / dh)" and the "contact area between the indenter and the sample being measured (contact projected area B)". The indentation depth of the indenter is 5 μm. The slope of the tangent to the unloading curve at maximum load is calculated by the following method. As a prerequisite, it is assumed that the power law shown in equation (1) below holds for the unloading curve. In equation (1), A, hf, and m are constants determined by applying the least squares method to the unloading curve. Differentiating equation (1) yields equation (2). From equation (2), the slope of the tangent to the unloading curve at maximum load is calculated. Note that A, hf, and m are calculated by applying the least squares method to the unloading curve between 20% and 95% of the indenter's compression load.

number

number

number

[0037] When the above-mentioned member 30 is measured by the nanoindentation method, the slope of the load curve is preferably between 1 [μN / nm] and 5 [μN / nm]. The slope of the load curve is calculated based on the results of measurements taken in the same manner as the measurement of the hardness of the above-mentioned member 30. The slope of the load curve is adopted as the slope when the indenter indentation depth is between 50% and 85%. In the above measurement, since the indenter indentation depth is 5 μm, the slope of the load curve is taken as the slope when the displacement is between 2.5 μm and 4.25 μm.

[0038] To increase the hardness, elastic modulus, and slope of the load curve of the above-mentioned member 30 by the nanoindentation method, for example, a larger amount of resin material with a higher elastic modulus can be incorporated into the member 30. On the other hand, to decrease the hardness, elastic modulus, and slope of the load curve of the above-mentioned member 30, for example, a larger amount of plasticizer or resin material with a lower elastic modulus can be incorporated into the member 30.

[0039] When the above-mentioned member 30 is measured by nanoindentation, the minimum load on the load curve is preferably between -0.40 μN and 0 μN, and more preferably between -0.10 μN and 0 μN. Because the minimum load on the load curve is between -0.10 μN and 0 μN, the wettability of the above-mentioned member 30 is almost eliminated, resulting in better sliding properties. When the above-mentioned member 30 is measured by nanoindentation, the minimum load of the unloading curve is preferably -1.50 μN or more and 0 μN or less, and more preferably -0.10 μN or more and 0 μN or less. Because the minimum load of the unloading curve is -0.10 μN or more and 0 μN or less, the adsorption force (adhesion force) of the above-mentioned member 30 is almost eliminated, resulting in better sliding properties. To increase the minimum load in the load curve and the minimum load in the unload curve obtained by the nanoindentation method, for example, a larger proportion of a hard material with poor adhesion can be incorporated into member 30. On the other hand, to decrease the minimum load in the load curve and the minimum load in the unload curve, for example, a larger proportion of a soft material with good adhesion can be incorporated into member 30.

[0040] The protruding component 30 is made of a material having the above-mentioned hardness. The protruding component 30 is made of a resin, for example, containing at least a resin material. As such a resin material, one or more of the following can be used: polyolefin resins such as polyethylene (PE), polypropylene (PP), and ethylene-propylene copolymer; ethylene-vinyl acetate copolymer resin (EVA); styrene-based thermoplastic elastomer resins (styrene-based block copolymers) such as SIS and SEBS; acrylic resin; polyvinyl chloride resin, CEBC resin; polyester such as PET; polyurethane resin; polyimide resin; polyamide resin; and polycarbonate resin. The protruding component 30 is not particularly limited, but it is preferable that it is made of a material mainly composed of one or more resins selected from the group consisting of polyolefin resin, polyester resin, ethylene-vinyl acetate copolymer resin (EVA), styrene-based thermoplastic elastomer resins such as SIS and SEBS; polyolefin-based elastomer resin; polyurethane-based elastomer resin; acrylic-based elastomer resin; acrylic resin; and polyamide resin. The component 30 of the protrusion preferably contains more than 10% by mass of any of these resins. The component 30 of the protrusion preferably contains 30% by mass or more of the above resin material. Among the above resin materials, at least one selected from the group consisting of polyolefin resin, ethylene-vinyl acetate copolymer resin (EVA), the above-mentioned styrene-based thermoplastic elastomer resin, acrylic resin, and polyamide resin is preferred. In other words, it is preferable that the component member 30 of the protrusion contains at least one selected from the group consisting of polyolefin, ethylene-vinyl acetate copolymer resin (EVA), the above-mentioned styrene-based thermoplastic elastomer resin, acrylic resin, and polyamide resin. Particularly preferable, it is more preferable that the component member 30 of the protrusion contains at least one resin selected from the group consisting of polyolefin resin, ethylene-vinyl acetate copolymer resin (EVA), the above-mentioned styrene-based thermoplastic elastomer resin, and acrylic resin. By including the above-mentioned preferred resin material in the protruding component 30, damage to the surface of the object to be cleaned due to sliding contact is suppressed. Furthermore, by including the above-mentioned preferred resin material in the protruding component 30, good lubricity and good durability (strength) can be more fully exhibited.

[0041] The component 30 of the protrusion may contain at least one of wax, cured resin, and inorganic powder in addition to the resin material described above, in order to have a higher modulus of elasticity. Furthermore, it is particularly preferable that the component 30 of the protrusion contains wax in order to have better lubricity. It is preferable that the component 30 of the protrusion contains an extender pigment as an inorganic powder. By including wax and an extender pigment as an inorganic powder in addition to the resin material of the component 30 of the protrusion, the lubricity of the component 30 of the protrusion itself is further improved, the frictional force of the component 30 of the protrusion itself is further reduced, and the lubricity of the cleaning sheet 1 is considerably improved.

[0042] Wax (solid wax) is a substance that is solid at room temperature (20°C), but changes into a paste or liquid state at temperatures higher than its melting point (for example, 2-3 degrees above the melting point). The melting point can be measured using commercially available melting point analyzers or differential scanning calorimeters (DSCs). The melting point of wax is usually between 50°C and 130°C, preferably above 80°C. Since wax is hard at room temperature, the component 30 of the protruding part containing wax has a relatively high hardness or elastic modulus at room temperature. In contrast, at a temperature slightly higher than the melting point of wax, the wax rapidly melts and its viscosity decreases compared to that of the resin material. Therefore, the component 30 of the protrusions containing wax has good processing suitability in hot melt coating. Furthermore, the component 30 of the protrusions containing wax in addition to the resin material has the advantage of being easily cut because the stretchability caused by the resin material is suppressed. Thus, the cleaning sheet 1 can have tape-cut properties.

[0043] The hardness of the wax, expressed as a penetration degree, is usually between 0.1 and 60. The penetration degree of the wax is preferably 50 or less, more preferably 35 or less, even more preferably 30 or less, even more preferably 15 or less, and particularly preferably 10 or less. The penetration degree of the wax may also be 1 or more. The above penetration values ​​are measured according to the Japanese Industrial Standard (JIS K2235 2009 5.4 Penetration Test Method). The measurement conditions are a temperature of 25°C, a load of 100g, and a time of 5 seconds.

[0044] Examples of waxes include hydrocarbon waxes and non-hydrocarbon waxes. Hydrocarbon waxes include petroleum mineral waxes such as paraffin wax, ceresin wax, and microcrystalline wax, as well as synthetic waxes such as polyethylene wax (low molecular weight polyethylene), polypropylene wax (low molecular weight polypropylene), and Fischer-Tropsch wax. Non-hydrocarbon waxes include natural waxes such as castor wax, carnauba wax, wood wax, privet wax, beeswax, montane wax, candelilla wax, and rice wax, as well as synthetic waxes such as diheptadecylketone, dipentadecylketone, diundecylketone, and ditridecylketone. Hydrocarbon waxes are preferred as the wax.

[0045] The following are specific examples of commercially available wax product names. Examples of microcrystalline waxes manufactured by Nippon Seiro Co., Ltd. include Hi-Mic-1045 (melting point 72℃, penetration degree 37), Hi-Mic-1070 (melting point 80℃, penetration degree 20), Hi-Mic-2095 (melting point 101℃, penetration degree 8), Hi-Mic-1090 (melting point 88℃, penetration degree 6), and Hi-Mic-1080 (melting point 84℃, penetration degree 12). Other examples include Fischer-Tropsch waxes manufactured by Nippon Seiro Co., Ltd., such as FT115 (melting point 113°C, penetration degree 1), SX105 (melting point 102°C, penetration degree 1), FT-0165 (melting point 73°C, penetration degree 5), and FT-0070 (melting point 72°C, penetration degree 11). Other examples include Fischer-Tropsch waxes manufactured by Sazol, such as Sazol Wax H1 (melting point 112°C, penetration degree 1) and Sazol Wax C80 (melting point 88°C, penetration degree 4-9). Other examples include low molecular weight polyolefin waxes manufactured by Sanyo Chemical Industries, Ltd., such as Sunwax 171-P (penetration degree 5), Sunwax 151-P (penetration degree 4), Sunwax 131-P (penetration degree 4), Sunwax 161-P (penetration degree 2), Sunwax E-310 (penetration degree 5), Sunwax E-330 (penetration degree 4), and Sunwax E-250P (penetration degree 5). Other examples include polyethylene waxes from Yasuhara Chemical Co., Ltd., such as product name Neowax (melting point 110℃, penetration degree 5), and polyethylene waxes from Mitsui Chemicals, such as product names Hiwax HP10A (melting point 116℃, penetration degree 2), Hiwax 210P (melting point 114℃, penetration degree 4), Hiwax 210MP (melting point 112℃, penetration degree 3), Hiwax 4202E (melting point 100℃, penetration degree 5), Hiwax NL100 (melting point 103℃, penetration degree 3), and Hiwax NP056 (melting point 124℃, penetration degree 2).

[0046] The component 30 of the protrusion preferably contains 5 parts by mass or more of wax per 100 parts by mass of the resin material, more preferably 10 parts by mass or more, even more preferably 50 parts by mass or more, and particularly preferably 100 parts by mass or more. Alternatively, the component 30 of the protrusion may contain 300 parts by mass or less of wax per 100 parts by mass of the resin material, 250 parts by mass or less, or 200 parts by mass or less. The component 30 of the protrusion may also contain only wax.

[0047] The component 30 of the protrusion preferably contains 1 part by mass or more of inorganic powder per 100 parts by mass of the resin material, more preferably 5 parts by mass or more, even more preferably 50 parts by mass or more, and particularly preferably 100 parts by mass or more. Alternatively, the inorganic powder may contain 400 parts by mass or less, 250 parts by mass or less, or 200 parts by mass or less per 100 parts by mass of the resin material. Examples of inorganic powders include extender pigments, coloring pigments, or functional particles. Examples of extender pigments include silica, titanium dioxide, zinc oxide, magnesium carbonate, calcium carbonate, or talc. The protruding component 30 may contain organic pigments and organic dyes in addition to inorganic powders.

[0048] If the convex component 30 includes the resin material, the extender pigment (inorganic powder), and the wax, the extender pigment may be included in an amount of 1 to 300 parts by mass per 100 parts by mass of the resin material, and the wax may be included in an amount of 1 to 300 parts by mass per 100 parts by mass of the resin material.

[0049] The protruding component 30 may include a cured resin. Examples of cured resins include uncured resin that hardens with energy rays, which is then cured by energy rays such as ultraviolet rays or electron beams. Specifically, examples of cured resins include UV-curable resins and electron beam-curable resins. The cured resin may also be a two-component reaction crosslinked cured product. For example, by coating a composition of the protruding component 30 containing a UV-curable resin and curing the composition by UV irradiation, a protruding component 30 with sufficient hardness and elastic modulus can be produced. This also makes it possible to obtain a cleaning sheet 1 with good slipperiness.

[0050] The component 30 of the protrusion preferably contains 10 parts by mass or more, and more preferably 50 parts by mass or more, of cured resin per 100 parts by mass of the resin material (thermoplastic resin). Alternatively, it may contain 400 parts by mass or less, or 200 parts by mass or less, of cured resin per 100 parts by mass of the resin material. The component 30 of the protrusion may also contain only cured resin.

[0051] Furthermore, the cleaning sheet 1 of this embodiment may include fiber aggregates, generally referred to as woven fabrics or nonwoven fabrics, in the protruding component 30 and the adhesive layer 40. In other words, the protruding component 30 and the adhesive layer 40 may be composed of fiber aggregates in at least a portion thereof. A fiber aggregate typically refers to an aggregate of fibers with a thickness of less than 0.03 mm. Fiber aggregates are produced, for example, by a melt-blown process.

[0052] The basis weight (grammage) of the constituting member 30 of the protruding portion, in other words, the mass of member 30 per unit area of ​​the cleaning surface 10, is set appropriately considering slipperiness and other factors. Such a basis weight is preferably 5 g / m². 2 The above is preferable to 10 g / m². 2 More preferably 20 g / m² 2 The above is the most preferred, and 30 g / m² is particularly preferred. 2 More preferably 40 g / m 2 In summary, the most preferred is 50 g / m². 2 That concludes the explanation. If the material of the constituent members 30 of the protrusions is the same and the arrangement of the multiple wire members is the same, then as the basis weight increases, the protruding height of the protrusions 12 will increase, or the exposure rate of the adhesive layer 40 will decrease. Therefore, a larger basis weight may result in a lower average adhesive force across the entire cleaning surface 10. This makes it easier to achieve better sliding properties. On the other hand, the above basis weight is preferably 500 g / m² in that it can exhibit better dust capture performance. 2 The following, and more preferably 400 g / m² 2 More preferably, 300 g / m 2 The following, particularly preferably 200 g / m² 2 The following applies:

[0053] The average protrusion height (average protrusion height H) of the protrusion 12 is set with consideration to at least dust trapping ability. The average protrusion height (average protrusion height H) of the protrusion 12 is set appropriately with consideration to slipperiness and durability as well. The average protrusion height of the protrusion 12 is the average of the heights from the tip of the protrusion 12 to the adhesive recess 14. The average protrusion height (H: mm) of the protrusion 12 is measured by cross-sectional observation using a surface roughness meter or microscope. The average protrusion height (average protrusion height H) of the protrusion 12 is preferably 1000 × 10 in order to exhibit better dust capture performance. -3 It is less than or equal to mm, more preferably 500 × 10 -3 It is less than or equal to mm. Such average protrusion height (average protrusion height H) may be 300 × 10 -3 It may be less than mm, 200 × 10 -3 It may be less than mm. The average protrusion height of the convex portion 12 (average convex portion height H) is 30 × 10 -3 It may be mm or larger, 50 x 10 -3 It may be 70 x 10 mm or larger. -3 It may be greater than or equal to mm. Such average protrusion height (average protrusion height H) may be 100 × 10 -3 It may be 300 x 10 mm or larger. -3 It may be greater than mm. By having the average protrusion height (average protrusion height H) of the protrusions 12 within the above-mentioned preferred range, the frictional force during sliding contact is suppressed, resulting in better sliding properties and allowing the cleaning surface 10 to slide more smoothly against the surface of the object to be cleaned. Furthermore, since the exposed surface of the adhesive layer 40 is positioned at a location recessed by more than the above-mentioned value from the tip of the protrusion, unintended adhesion of the cleaning surface 10 to the object to be cleaned can be further suppressed. For example, when the support base material 50 is made of paper with low cushioning properties, or when it is made of nonwoven fabric or foam with high cushioning properties, an appropriate average protrusion height of the protrusions 12 can be set.

[0054] The tip of the protrusion 12 is preferably tapered, and more preferably rounded. In other words, the tip is preferably shaped such that the cross-sectional area of ​​the cleaning surface 10 decreases towards the tip. If the tip is tapered, it does not have to be pointed and may be flat. The tapered shape of the tip of the protrusion 12 reduces the frictional force when the protrusion 12 comes into contact with the object being cleaned. Therefore, it can exhibit better sliding properties.

[0055] (Adhesive recess) In this embodiment, the adhesive recess 14 is a part of the adhesive layer 40 described below. In other words, a part of the adhesive layer 40 constitutes the adhesive recess 14. To put it another way, a part of the surface of the adhesive layer 40 is exposed and constitutes the adhesive recess 14. By arranging the linear members of the member 30 on the surface of the adhesive layer 40 with a gap A between them, a part of the surface of the adhesive layer 40 is exposed at the gap A, and the rest of the surface of the adhesive layer 40 is covered by the member 30. However, as will be described later, the cleaning sheet of the present invention is not limited to this configuration.

[0056] In this embodiment, as shown in Figure 1, the adhesive layer 40 extends continuously in the planar direction of the cleaning surface 10. The shape of each adhesive recess 14 when the cleaning surface 10 is viewed in the thickness direction of the cleaning sheet 1 is not particularly limited. The adhesive recess 14 does not have to have a fixed shape. On the other hand, the shape of each adhesive recess may be a polygon such as a square or triangle, a circle such as a perfect circle or ellipse, or other irregular shape.

[0057] On the cleaning surface 10, the ratio of the exposed area of ​​the adhesive layer 40 (hereinafter also simply referred to as the exposure rate) is 30% or more. Such an exposure rate is preferably 40% or more, more preferably greater than 50%, and even more preferably 60% or more. Because the exposure rate is greater than 40%, the adhesive recesses 14 can capture debris more effectively. Therefore, the cleaning sheet 1, which has good slipperiness, can also have good debris-capturing properties. The exposure rate mentioned above may be 95% or less, or 90% or less. A lower upper limit of 95% exposure rate allows for better slipperiness. A higher exposure rate is preferable in that it can better suppress clogging by debris and capture debris more effectively. However, as described in Patent Document 1 above, a higher exposure rate makes it easier for the adhesive layer 40 to come into contact with the object to be cleaned. This can result in adhesive residue or make it difficult to operate during cleaning. In the cleaning sheet 1 described above, good slipperiness can be achieved even with an exposure rate of 30% or more by selecting the material of the component member 30 of the protrusions or by setting the ratio (H / L) described later. For example, by bonding the support base material 50 and the protruding component 30 together, or by coating the support base material 50 with the protruding component 30 (described later), a cleaning sheet 1 can be manufactured in which the support base material 50 and the protruding component 30 directly overlap. When manufacturing the cleaning sheet 1 by coating, the exposure ratio can be appropriately set according to the material of the protruding component 30 and the thickness of the support base material 50 in the thickness direction, etc., so as to provide good slipperiness and dust trapping ability. As described in Patent Document 1 above, in a manufacturing method in which circular holes are formed by punching out a fiber sheet and an adhesive sheet is attached to this fiber sheet, the strength of the fiber sheet is relatively low, so there are limitations on the size and number of holes, and the exposure rate may be limited. On the other hand, by creating the protruding component 30 by coating, the protruding component 30 can be directly formed on the support substrate 50 or adhesive layer 40, so the exposure rate can be freely set. Furthermore, by creating the protruding component 30 by coating, it is possible to easily create protruding component 30 that has holes but does not have a continuous pattern shape as in Patent Document 1. For example, it is possible to easily create protruding component 30 with any discontinuous pattern shape.

[0058] The above exposure rate is the ratio of the total exposed area of ​​the adhesive layer 40 to the total area of ​​the cleaning surface 10. The total area of ​​the cleaning surface 10 is the larger of either the area of ​​the portion where the convex component 30 extends in the planar direction, or the area of ​​the adhesive layer 40. When the area of ​​the adhesive layer 40 is used as the total area of ​​the cleaning surface 10, even if the adhesive layer 40 does not extend continuously in the planar direction, the area of ​​the adhesive layer 40 is defined as the area of ​​the region inward from the outermost adhesive composition in the planar direction. The exposure rate can be determined from the total exposed area of ​​the adhesive layer 40 per unit area of ​​the cleaning surface 10. The exposure rate can be determined, for example, as follows: Specifically, a photograph of the appearance of the component 30 is taken, the photograph is enlarged onto copy paper or the like, and the shape of the exposed adhesive layer 40 is cut out with scissors or the like. The exposure rate can then be accurately calculated by dividing the mass of paper cut out per unit area by the mass of paper per unit area. Alternatively, the exposure rate can be accurately calculated from an image taken with a microscope or the like using image processing. In the embodiments described later, the exposure rate is also measured using these methods. In measuring the exposure rate, it is preferable that the entire area of ​​the cleaning surface 10 be measured, but if the arrangement pattern of the components is regular, it may be an arbitrarily selected area, for example, a 3cm x 3cm square. If the arrangement pattern of the components on the cleaning surface 10 is not regular and differs in parts, the exposure rate of the entire cleaning surface 10 is measured. Furthermore, if the support substrate 50 is exposed on the cleaning surface 10, the area of ​​the exposed portion of the support substrate 50 is not included in the total exposed area of ​​the adhesive layer 40 when calculating the exposure rate. For example, if the support substrate 50 and the adhesive layer 40 are exposed between multiple wire members of the convex component member 30, only the area of ​​the exposed portion of the adhesive layer 40 is included in the total exposed area of ​​the adhesive layer 40, and the area of ​​the exposed portion of the support substrate 50 is not included in the total exposed area of ​​the adhesive layer 40.

[0059] The cleaning surface 10 typically has a first direction in which the average length of the above-mentioned intervals is minimized in the surface direction. For example, in this embodiment, the first direction is perpendicular to the direction in which the linear members of the convex component 30 extend. In this first direction, the average length (L: mm) of the shape of the adhesive recess 14 at the above-mentioned interval A formed by the convex component member 30, in other words, the average length (L: mm) of the shape of each adhesive recess 14 in the first direction of the cleaning surface 10, is appropriately set considering slipperiness and dust capture performance. For example, the above average length of the shape of the adhesive recess 14 is preferably 10 mm or less, more preferably 8 mm or less, even more preferably 5 mm or less, and particularly preferably 3 mm or less, in order to exhibit better slipperiness. By setting the above average length of the shape of the adhesive recess 14 to 10 mm or less, the average adhesive force on the entire cleaning surface 10 becomes smaller, which can prevent unused cleaning sheets from sticking to packaging materials or other cleaning sheets. Furthermore, the above average length of the shape of the adhesive recess 14 is preferably 0.3 mm or more, more preferably 0.5 mm or more, even more preferably 0.8 mm or more, and particularly preferably 1.0 mm or more, in order to exhibit better dust capture performance.

[0060] The average length of the shape of the adhesive recess 14 in the first direction described above is measured as follows. In principle, the virtual straight line used to determine the first direction is set to pass through the central part of the cleaning surface where the adhesive recess exists. In this embodiment, as shown in Figure 1, multiple line members extend parallel to each other in one direction in the surface direction of the cleaning surface 10. The first direction is the direction perpendicular to the line members because the average length of the above interval is minimized in the direction in which the virtual straight line is perpendicular to the line members (see the straight dashed line in Figure 1). In this embodiment, as shown in Figure 1, the convex component 30 is composed of multiple line members arranged in a straight line with approximately the same interval A in the first direction. The above average length is determined by measuring the distance between adjacent line members at least 10 locations and averaging the measured values. The embodiments described later are measured in the same way. As shown in Figure 4, when the shape of each adhesive recess 14 is circular, and as shown in Figure 5, when the shape of each adhesive recess 14 is rectangular, the first direction is determined in the same manner as above, and the average length of the shape of the adhesive recess 14 is calculated. In contrast, if it is difficult to define the first direction as a single direction, the average length can be determined as follows. For example, in one example of the constituent members 30 of the assumed protrusion, as shown in Figure 6, short linear members are intermittently arranged at intervals in the longitudinal direction, and the short linear members are arranged at approximately the same intervals in a direction perpendicular to the longitudinal direction. Another example of the constituent members 30 of the assumed protrusion is composed of small members that form letters, as shown in Figure 7. In such cases, the diameter of the virtual largest circle (perfect circle) inscribed in the member in the gap between the members is considered to be the length of the shape of each adhesive recess 14 (see the circle drawn with a dashed line). At this time, at least three arbitrarily selected 3cm × 3cm square sections are chosen, the length of the shape of at least 10 adhesive recesses 14 in each square section is measured, and the average length is determined by averaging these measured values.

[0061] On the cleaning surface 10, the ratio (H / L) of the average height of the protrusions (H: mm) from the tip of the protrusion 12 to the adhesive recess 14, and the average length of the shape of the adhesive recess in the first direction where the average length of the above interval is minimized in the surface direction of the cleaning surface, is 15 × 10 -3 That is all. Such a ratio (H / L) is preferably 20 × 10 -3 More than 25×10 -3 More preferably 30 × 10 -3 The above, particularly preferably 40 × 10 -3 More preferably 45 × 10 -3 That's all. The above ratio (H / L) may be 60 × 10 -3 It may be greater than or equal to 70 x 10 -3 That's fine too. The above ratio (H / L) is 20 × 10 -3 As a result of the above, the average height of the protrusions relative to the average length of the shape of each adhesive recess 14 is relatively large, so that the adhesive recesses 14 do not come into contact with the surface of the object to be cleaned. Therefore, the frictional force on the entire cleaning surface 10 is reduced, and better sliding properties are achieved. In addition, as described above, unintended adhesion of the cleaning surface 10 to the object to be cleaned can be further suppressed. The above ratio (H / L) is preferably 600 × 10 -3 The following is more preferably 300 x 10 -3 More preferably, 150 × 10 -3 The following are particularly preferred: 100 × 10 -3 More preferably, 80 × 10 -3 The following applies: The above ratio (H / L) is 600 × 10 -3 The following conditions allow the adhesive force on the cleaning surface 10 to be more easily exerted, resulting in better dust capture performance.

[0062] (Adhesive layer) In this embodiment, the adhesive layer 40 extends in the planar direction of the cleaning surface 10 and is positioned on the back side of the convex component member 30. The adhesive layer 40 is formed in layers, for example, by an adhesive composition. The cleaning sheet 1 of this embodiment can be manufactured relatively easily because the cleaning surface 10 can be formed by placing the convex component 30 on top of the adhesive layer 40. Furthermore, when cleaning an object with the cleaning surface 10 of the cleaning sheet 1, if the tip of the protrusion 12 is pressed against the surface of the object to be cleaned and slides against it, the protrusion 12 may be supported by the adhesive layer 40 and slightly penetrate into the adhesive layer 40. As a result, the protruding height (protrusion height) of the protrusion 12 becomes slightly lower, and the adhesive recess 14, which is recessed more than the protrusion 12, may come a little closer to the surface of the object to be cleaned. And as the adhesive recess 14 comes closer to the surface of the object to be cleaned, the adhesive recess 14 can capture dirt more reliably.

[0063] The adhesive composition forming the adhesive layer 40 includes, for example, acrylic adhesives, rubber adhesives, polyester adhesives, urethane adhesives, polyether adhesives, and silicone adhesives. Furthermore, the adhesive composition may include a tackifier and a plasticizer such as process oil. The type and proportion of each component are set according to the intended use of the cleaning sheet 1, etc., so that the desired adhesive performance can be obtained. For example, a rubber-based adhesive is an adhesive that contains a rubber-based polymer as its base polymer. The same applies to other adhesives. The base polymer of the adhesive is the polymer component with the highest proportion in the adhesive. The adhesive may contain 50% or more by mass of the base polymer, 70% or more by mass, or 90% or more by mass, based on the solid content. The adhesive may also contain only the base polymer, or for example, 99% or less by mass of the base polymer. In terms of exhibiting better adhesive performance and having a relatively high performance-to-raw material cost ratio, the adhesive is preferably a rubber-based adhesive or an acrylic-based adhesive.

[0064] Acrylic adhesives contain an acrylic polymer as a base polymer. An acrylic polymer refers to a polymer whose main constituent monomer component is an acrylic monomer. An acrylic monomer is a monomer having at least one (meth)acryloyl group in one molecule. The main constituent monomer component accounts for 50% by mass or more of the total amount of monomer components constituting the acrylic polymer. More than 70% by mass of the monomer components constituting the acrylic polymer may be acrylic monomers, and more than 90% by mass may be acrylic monomers. The acrylic polymer may be a homopolymer obtained by radical polymerization, or a copolymer obtained by random copolymerization. The acrylic polymer may be a thermoplastic (typically hot-melt type) block copolymer. In this specification, (meth)acryloyl group refers collectively to acryloyl group and methacryloyl group. Similarly, in this specification, (meth)acrylate refers collectively to acrylate and methacrylate.

[0065] Examples of rubber-based adhesives include adhesives that contain one or more rubber-based polymers as a base polymer, such as natural rubber and its modified products, 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). As for rubber-based adhesives, adhesives containing SIS as a base polymer (SIS-based adhesives) are preferred.

[0066] Examples of the tackifying resins mentioned above include various tackifying resins such as rosin-based, terpene-based, hydrocarbon-based, epoxy-based, polyamide-based, elastomer-based, phenol-based, and ketone-based resins. These can be used individually or in combination of two or more as appropriate. The amount of tackifying resin blended with 100 parts by mass of base polymer is not particularly limited, but may be, for example, 50 parts by mass or more and 200 parts by mass or less, and preferably 80 parts by mass or more and 150 parts by mass or less.

[0067] Examples of the plasticizers mentioned above include process oils; acrylic oligomers; phthalate ester plasticizers such as dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, and dibutyl phthalate; adipic acid ester plasticizers such as dioctyl adipate and diisononyl adipate; trimellitic acid esters such as trioctyl trimellitic acid; sebacate 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 their derivatives such as sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, and their ethylene oxide adducts. These plasticizers can be used individually or in combination of two or more as appropriate. In the adhesive composition, the amount of plasticizer blended per 100 parts by mass of base polymer is not particularly limited, but may be, for example, 50 parts by mass or more and 200 parts by mass or less, and preferably 90 parts by mass or more and 150 parts by mass or less. Examples of the above-mentioned process oils include general paraffinic, naphthenic, and aromatic process oils.

[0068] The adhesive composition (for example, a composition containing an SIS-based adhesive) may further contain various additives such as anti-aging agents, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, lubricants, and colorants (pigments, dyes, etc.). The types and amounts of these additives may be the same as those commonly used in the field of general adhesives.

[0069] Various types of adhesive compositions can be used to produce the adhesive layer 40. For example, hot-melt type compositions that form the adhesive layer 40 by heating and melting and then cooling and solidifying, curing type compositions that optionally contain a curing agent, energy ray irradiation curing type compositions that harden by irradiation with energy rays such as ultraviolet rays (UV) or electron beams (EB), water-dispersible type compositions (typically emulsion type) in which the adhesive component is dispersed in water, and solvent-type compositions in which the adhesive component is dissolved in an organic solvent can be used. From the viewpoint of good productivity and reduction of environmental impact, a hot-melt type adhesive composition is preferably used to produce the adhesive layer 40.

[0070] The probe tack of the adhesive layer 40, as measured by the probe tack method, is 1.0 kN / m 2 More than 500.0kN / m 2 The following is preferable: The probe tack of the adhesive layer 40 is 1.0 kN / m 2 More than 500.0kN / m 2 As described above, and moreover, by having a hardness of 0.4 MPa or more for the component member 30 of the protrusion, it is possible to achieve good slipperiness while also achieving good dust capture performance.

[0071] The measured probe tack of the adhesive layer 40, as measured by the probe tack method, was 250.0 kN / m 2 It is more preferable that the following is the case: 150.0 kN / m 2 The following is even more preferable: The probe tack of the adhesive layer 40 is 250.0 kN / m 2 As a result of the following, even when the adhesive recess 14 comes into contact with the surface of the object to be cleaned, the cleaning surface 10 moves along the surface of the object to be cleaned during sliding contact, allowing the adhesive recess 14 to separate from the surface of the object to be cleaned relatively easily. Therefore, the cleaning surface 10 slides more smoothly against the surface of the object to be cleaned. Consequently, the cleaning sheet 1 has better sliding properties. The measured probe tack of the adhesive layer 40 was 5.0 kN / m 2 It may be greater than or equal to 10.0 kN / m 2 It may be greater than or equal to 25.0 kN / m 2 It may be greater than or equal to 50.0 kN / m 2 That's fine too. To increase the measured probe tack of the adhesive layer 40, for example, an appropriate amount of tackifying resin or plasticizer can be added to the adhesive layer 40. On the other hand, to decrease the measured probe tack of the adhesive layer 40, for example, the amount of tackifying resin or plasticizer in the adhesive layer 40 can be reduced.

[0072] The probe tack of the adhesive layer 40 is measured using a probe tack tester. At least 10 measurements are taken, and the average value of the measured values ​​is taken as the probe tack value. The detailed test conditions are as follows: A circular stainless steel probe (diameter: 5 mm) is brought into contact with the adhesive surface of the adhesive layer 40 for 1 second while applying a constant load (50 gf / 5 mmφ). The force required to pull the probe 5 mm perpendicularly away from the adhesive surface is determined, and this is taken as the probe tack (adhesion force) value of the adhesive layer. The measurement is performed with the adhesive layer 40 overlapping the support substrate 50. The probe contact speed (pressing speed) is 120 mm / min, and the peeling speed is 600 mm / min. The measurement is performed at a temperature of 23°C and in an environment of 50% RH.

[0073] The adhesive strength of the adhesive layer 40 is appropriately set considering the slipperiness and dust-catching properties of the cleaning sheet 1. The adhesive strength of the adhesive layer 40 is measured by the peel strength as follows. The 180-degree peel strength of the adhesive layer 40 is preferably 0.5 N / 25 mm or more, more preferably 1.0 N / 25 mm or more, even more preferably 3.0 N / 25 mm or more, and particularly preferably 5.0 N / 25 mm or more, in order to exhibit better dust-catching ability. Since dust and other debris in households are relatively light, an adhesive layer 40 with an adhesive strength of 1.0 N / 25 mm or more is sufficient to capture the debris. Furthermore, in order to exhibit good slipperiness to the object to be cleaned and to prevent the cleaning sheet 1 from sticking to the surface of the object to be cleaned, the 180-degree peel strength of the adhesive layer 40 is preferably 40 N / 25 mm or less, more preferably 25 N / 25 mm or less, even more preferably 20 N / 25 mm or less, and particularly preferably 15 N / 25 mm or less. The above 180-degree peel strengths are measured values ​​based on a 180-degree peel test on a stainless steel (SUS304) plate as specified in JIS Z 0237. Furthermore, if the adhesive layer 40 is not formed in a shape that extends in the planar direction of the cleaning surface 10, but rather, for example, is formed so that multiple lines extend in parallel in one direction in the planar direction (in the case of a discontinuous coating), the 180-degree peel strength of the adhesive layer is determined by converting the measured strength to the strength when it is 25 mm wide as described above. Also, if the adhesive layer 40 is a discontinuous coating as described above, it is difficult to determine the average value, so the peak value (maximum value) observed during measurement is used to determine the 180-degree peel strength.

[0074] The above peel strength measurement is specifically performed using the following procedure. A rectangular sheet-like test piece is removed from the adhesive layer 40 supported on the support substrate 50. The length of the test piece is preferably about 100 to 200 mm, and the width is preferably about 15 to 25 mm. If the width of the test piece is less than 25 mm, a conversion value [N / 25 mm] can be calculated (converted) from the ratio of the actual width of the test piece to the standard width of 25 mm. The thickness of the test piece is not particularly limited. One surface of the test piece (the cleaning surface side) is attached to a stainless steel (SUS304) plate, and a 2 kg roller is pressed down by passing it back and forth once. If both sides of the test piece are adhesive, it is preferable to back the surface opposite to the surface to be measured with a polyethylene terephthalate (PET) film with a thickness of about 25 μm. The test sample prepared in this way is held in an environment of 23°C and RH 50% for 30 minutes. Subsequently, using a tensile testing machine, the 180-degree peel strength (adhesion to SUS) [N / 25mm] is measured in accordance with JIS Z 0237, under conditions of 23°C, 50% RH, a peel angle of 180 degrees, and a tensile speed of 300 mm / min. The tensile testing machine used is not particularly limited, and any conventionally known tensile testing machine can be used. For example, Shimadzu Corporation's "Tensilon" can be used.

[0075] The average thickness of the adhesive layer 40 (or the average total thickness of multiple adhesive layers if the adhesive layer has a multilayer structure) can be set appropriately depending on the purpose and is not particularly limited. The average thickness of the adhesive layer 40 is preferably 1 μm or more, more preferably 5 μm or more, even more preferably 10 μm or more, and particularly preferably 15 μm or more, in terms of exhibiting better dust trapping performance. The average thickness of the adhesive layer 40 is preferably 300 μm or less, more preferably 150 μm or less, even more preferably 60 μm or less, and particularly preferably 40 μm or less, in terms of exhibiting better slipperiness and preventing adhesive residue on the object to be cleaned. The average thickness is the average of measurements taken at least 5 randomly selected locations.

[0076] (Supporting base material) The cleaning sheet 1 described above preferably includes a support base material 50. By including the support base material 50 in the cleaning sheet 1, the adhesive layer 40 is supported by the support base material 50, thereby suppressing deformation of the adhesive layer 40 during friction. Consequently, the adhesive performance of the adhesive layer 40 is fully realized, resulting in better dust capture performance.

[0077] The tensile strength of the support base material 50 is preferably 5N / 50mm or more. A tensile strength of 5N / 50mm or more of the support base material 50 allows the adhesive layer 40 to be more adequately supported by the support base material 50. As a result, as described above, the protrusions 12 can be more adequately supported by the adhesive layer 40 during sliding contact and can penetrate slightly into the adhesive layer 40. This allows the adhesive recesses 14 to come slightly closer to the surface of the object to be cleaned. And, as the adhesive recesses 14 come closer to the surface of the object to be cleaned, they can more reliably capture debris. Note that the strength of the support base material 50 may be 200N / 50mm or less.

[0078] The tensile strength of the support substrate 50 is determined by measuring its tensile strength. Specifically, this strength (tensile strength) is measured by setting a test piece cut into a strip 50 mm wide into a tensile testing machine (chuck distance 100 mm) and measuring the tensile strength [N / 50 mm] under the condition of a tensile speed of 200 mm / min.

[0079] The support base material 50 may be various resin sheets, or fiber sheets such as nonwoven fabrics, woven fabrics, or paper, metal foil, or a composite thereof. Preferably, the support base material 50 has at least one of the resin sheets and fiber sheets. Resin sheets include synthetic resin films, rubber sheets, foam sheets, etc. Fiber sheets include nonwoven fabrics, woven fabrics, paper, etc. The shape of the support base material 50 is not particularly limited and may be flat, cylindrical, etc., and the support base material 50 may be a deformable material such as a cloth or sponge. The support base material 50 may be made of polyolefin, polyester, other synthetic resin, paper, synthetic fiber or natural fiber, stainless steel or other metal, etc.

[0080] Examples of resin sheet materials include polyolefins (PE, PP, ethylene-propylene copolymer, etc.), polyesters (PET, etc.), vinyl chloride resin, vinyl acetate resin, polyimide resin, polyamide resin, and fluororesin. Examples of rubber sheets include natural rubber sheets and butyl rubber sheets. Examples of foamed resin sheets include polyethylene, polypropylene, polyurethane, ethylene vinyl acetate copolymer (EVA), and polyethylene terephthalate (PET). Examples of paper include Japanese paper, kraft paper, glassine paper, fine paper, synthetic paper, and topcoat paper. Examples of woven or nonwoven fabrics include those formed from a single type of fiber or a blend of multiple types of fibers. Examples of the above fibers include cotton, rayon, Manila hemp fiber, pulp, rayon fiber, acetate fiber, polyester fiber, polyvinyl alcohol fiber, polyamide fiber, and polyolefin fiber. The manufacturing method of the nonwoven fabric is not limited to spunlace, chemical bond, meltblown, steam jet, or needle punch. Examples of metal foils include aluminum foil and copper foil.

[0081] Furthermore, when using nonwoven fabrics or foams with a large surface roughness (unevenness) as the support base material 50, the components 30 of the protrusions and the adhesive layer 40 may not adhere sufficiently to such a support base material 50 even when superimposed. In contrast, it is preferable to cover the nonwoven fabric or foam with a polyethylene film or polypropylene film to provide a smooth laminated layer on the surface of the support base material 50. By smoothing the surface of the surface of the support base material 50 with a laminated layer, it becomes possible to form the components 30 of the protrusions and the adhesive layer 40 at high speed by coating, as described later. This makes it possible to manufacture the components 30 of the protrusions and the adhesive layer 40 relatively quickly and easily.

[0082] The support substrate 50 may, as needed, contain various additives such as fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, lubricants, plasticizers, and colorants (pigments, dyes, etc.).

[0083] The thickness of the support substrate 50 is not particularly limited and can be appropriately selected depending on the purpose. The thickness of the support substrate 50 is preferably 5 μm or more, more preferably 10 μm or more, and even more preferably 20 μm or more. Alternatively, the thickness of the support substrate 50 is preferably 5 mm or less, more preferably 3 mm or less, and particularly preferably 1 mm or less. The support substrate 50 may be a rubber plate, and the cleaning sheet 1 may be provided with an adhesive layer 40 and a convex component 30 on this support substrate 50. The above thickness is appropriately designed for, for example, a synthetic resin sheet, nonwoven fabric, or paper support substrate 50.

[0084] The cleaning sheet 1 of this embodiment has a cleaning surface with irregularities, and is used by sliding the tips of the protrusions against the object to be cleaned. Therefore, even if the adhesive recesses, which are recessed compared to the protrusions and have relatively high adhesive strength, do not come into contact with the object to be cleaned, the cleaning surface can move along the surface of the object to be cleaned. Thus, the frictional force during sliding can be made relatively small. Consequently, the above cleaning sheet can slide against the surface of the object to be cleaned with a relatively small frictional force, and therefore has good sliding properties. Furthermore, the ratio (H / L) of the average height of the protrusion from the tip of the protrusion to the adhesive recess (H: mm) to the average length of the shape of the adhesive recess in the first direction where the average length of the spacing in the surface direction of the cleaning surface is minimized is 15 × 10 -3 Therefore, contact between the adhesive recess and the surface of the object to be cleaned is suppressed, while the tip of the protrusion can still slide against it. Thus, while the protrusion slides against the object to be cleaned, debris can be drawn into the gaps between the members constituting the protrusion. Furthermore, according to the cleaning sheet 1 of this embodiment, the adhesive properties of the adhesive recesses 14 allow for effective capture of debris. For example, when the cleaning sheet 1 is brought into contact with the cleaning surface by a cleaning worker's wiping operation, debris from the object to be cleaned is captured by the adhesive recesses 14 on the cleaning surface 10. The captured debris is then collected in the depressions near the adhesive recesses 14. Moreover, even if the captured debris is relatively heavy, the adhesive force of the adhesive recesses 14 can maintain the capture of the debris. In the cleaning sheet 1 of this embodiment, the proportion of the exposed area of ​​the adhesive layer on the cleaning surface 10 is 30% or more, so it can adequately capture dust and debris. On the other hand, when heavy debris is captured by a conventional simple fiber aggregate, the weight of the debris makes it easy for the captured debris to detach from the fiber aggregate. Thus, with the cleaning sheet 1 described above, even relatively heavy debris such as sand grains, which are generally difficult to maintain capture of, can be maintained by the adhesive force of the adhesive recesses 14. Therefore, the cleaning sheet 1 described above has good debris capture capabilities. Thus, the cleaning sheet 1 with the above configuration has good slipperiness and good dust-catching ability.

[0085] (Any other layer, member) In addition to the above-described protruding component 30, adhesive layer 40, and support base material 50, the cleaning sheet 1 of this embodiment may further have one or more layers as needed. For example, an intermediate layer may be placed between the protruding component 30 and the adhesive layer 40 in order to provide the cleaning sheet 1 with appropriate thickness, cushioning, strength, etc. The intermediate layer may be a layer with the same spacing as the spacing A in the protruding component 30. The composition of the intermediate layer is not particularly limited and may be a resin layer formed from various resin materials, a rubber layer (natural rubber sheet, butyl rubber sheet, etc.), a foam layer, a fibrous layer (paper, cloth, woven or nonwoven fabric made from paper, cloth, various fibrous materials alone or blended, etc.), or a metal layer (typically metal foil), etc. An anchor layer may be provided between the adhesive layer 40 and the support substrate 50 to improve anchoring performance. Various coating layers may be provided on the back surface (non-adhesive surface) of the support substrate 50 for aesthetic purposes or to improve handling. Furthermore, in a cleaning sheet with a cleaning surface formed on only one side, an adhesive layer may overlap the back side (opposite side of the cleaning surface) of the support substrate. The adhesive strength of the adhesive layer is higher than that of the convex component but lower than that of the adhesive layer itself. The adhesive layer may be formed of ethylene vinyl acetate copolymer resin (EVA). When multiple cleaning sheets with such adhesive layers are stacked in the same direction in the thickness direction, or when cleaning sheets with adhesive layers are wound up and stacked, displacement of the stacked state is suppressed, and strong adhesion between the overlapping cleaning sheets can be suppressed. Furthermore, the protrusions may be made of a self-adhesive material, and the back surface of the support substrate may also be made of the same self-adhesive material. Low molecular weight tackifiers or chloroprene rubber can be used as self-adhesive materials. The protrusions made of the self-adhesive material do not have much adhesiveness unless they come into contact with other self-adhesive materials, and therefore can exhibit sliding properties. On the other hand, if a self-adhesive material is also used on the back surface of the support substrate for the cleaning sheets, when the cleaning sheets are stacked as described above, the shifting of the stacked state is suppressed, and the strong adhesion between the overlapping cleaning sheets can also be suppressed.

[0086] Furthermore, in a cleaning sheet having a cleaning surface formed on only one side, a back-side member 60 similar to the component of the protrusion may be provided on the back side of the support base material. For example, the back-side member 60 is composed of a plurality of linear members as shown in Figure 8, and these linear members extend in the same direction as the extending direction of the component of the protrusion on the front side 30. When a plurality of cleaning sheets having such a configuration are stacked in the same direction in the thickness direction, or when cleaning sheets having such a configuration are wound up and stacked, the protrusions of the component of the protrusion and the protrusions of the back-side member 60 can be arranged alternately, thereby suppressing misalignment of the stacked state. Specifically, the component of the protrusion 30 of one cleaning sheet can fit between the back-side member 60 of the other cleaning sheet, suppressing misalignment of the cleaning sheet in the width direction of the linear members.

[0087] The total thickness of the cleaning sheet 1 in this embodiment is not particularly limited. The total thickness of the cleaning sheet 1, which has a sheet shape, may be 1800 μm or less, 1000 μm or less, or 800 μm or less. The total thickness of the cleaning sheet 1 is preferably 500 μm or less, more preferably 300 μm or less, and even more preferably 250 μm or less, in terms of improving handling and other aspects. The above total thickness may also be 50 μm or more, or 120 μm or more. The above total thickness is preferably 150 μm or more, more preferably 180 μm or more, and even more preferably 200 μm or more, in terms of exhibiting better slipperiness and better dust capture capabilities. Such a total thickness is the average of the thicknesses at at least 5 randomly selected locations.

[0088] (Method of manufacturing cleaning sheets) The manufacturing method for the cleaning sheet 1 in this embodiment is a method of forming the protruding component member 30 by coating.

[0089] In the above manufacturing method, the protruding component 30 can be formed by overlapping it with the support substrate 50 by coating. Furthermore, in the above manufacturing method, the protruding component 30 can be formed by overlapping it with the adhesive layer 40 by coating. When the protruding component 30 is superimposed on the support substrate 50 or adhesive layer 40 by coating, it may be coated directly onto these materials and then superimposed, or the protruding component 30 formed by first coating on another material may be transferred to the support substrate 50 or adhesive layer 40 (transfer method).

[0090] The manufacturing method of the cleaning sheet 1 of this embodiment includes, for example, an adhesive layer manufacturing step of creating an adhesive layer 40 superimposed on the surface of a support base material 50, and a protrusion manufacturing step of creating a protrusion 12 by superimposing a protrusion component 30 on the surface of the support base material 50 or the adhesive layer 40. The order of these steps is not particularly limited.

[0091] In the adhesive layer preparation process, the adhesive layer 40 can be prepared by a general method. This method is not particularly limited. In the adhesive layer preparation process, the adhesive composition is directly applied to the support substrate 50 using conventionally known coating methods and then cured or dried. Alternatively, the adhesive composition can be applied to a surface with release properties (for example, the surface of a release liner or the back surface of a support substrate that has been treated for mold release), and the applied adhesive composition can be cured or dried to create an adhesive layer 40 on the surface. It is also possible to use a method (transfer method) in which the adhesive layer 40 prepared on the release property is superimposed onto the support substrate 50 or the component members 30 of the protrusions.

[0092] In the adhesive layer preparation process, the adhesive layer 40 may be prepared over the entire surface of one side of the support substrate 50. Alternatively, non-adhesive areas (dry edges) may be provided on the support substrate 50 by, for example, not applying the adhesive composition to both ends of the strip-shaped support substrate 50 in the width direction. Typically, a continuous layered adhesive layer 40 is prepared, but depending on the purpose and application, the adhesive composition may be applied in a regular or random pattern such as dots, stripes, or a grid. The adhesive layer may also be prepared by applying the same adhesive composition or different adhesive compositions multiple times. The coating method used in the adhesive layer fabrication process may be the same as the coating method used in the protrusion fabrication process described later.

[0093] In the adhesive layer preparation process, an adhesive composition containing an uncured resin that hardens with energy rays may be applied and cured with energy rays such as ultraviolet rays or electron beams to produce the adhesive layer 40. Specific examples of the uncured resin include ultraviolet-curable (UV-curing) resins and electron-beam-curable (EB-curing) resins.

[0094] In the process of creating the protrusions, the protrusions 12 are formed by extruding a resin material that has been melted by heating, for example. Specifically, the resin material, which is the raw material for the constituent members 30 of the protrusions, is extruded to create multiple parallel lines, and line members are produced on the support base material 50 or adhesive layer 40. Alternatively, a resin composition containing resin material, wax, and at least one of the uncured resins described above can be extruded in the same manner as described above, and line members can be produced by irradiating with energy rays as necessary.

[0095] In the process of creating the protrusions, various types of resin compositions are used to produce the constituent members 30 of the protrusions. For example, the hot-melt type composition, curing type composition, water-dispersible (typically emulsion type) type composition, solvent type composition, etc., mentioned above, can be used. These resin compositions may be applied directly onto the support substrate 50, or applied onto the adhesive layer 40 superimposed on the support substrate 50. The coating method can be either direct application or transfer application.

[0096] Possible coating methods include roll coating, gravure coating, flexographic coating, kiss coating (including microgravure coating), bar coating, comma coating, blade coating, die coating, slide coating, and curtain coating. Die coating, gravure coating, and flexographic coating are particularly preferred as they are excellent for coating fine patterns. In the coating method, the resin composition may be coated to form a continuous layer, or, depending on the purpose and application, the resin composition may be coated to form a regular or random discontinuous pattern such as dots, stripes, or grids. Furthermore, the adhesive layer 40 and the protruding component 30 may each have a multilayer structure of two or more layers. In addition, by foam coating the resin composition, the adhesive layer 40 or the protruding component 30 can have cushioning properties.

[0097] To manufacture the cleaning sheet 1 at a lower cost, it is possible to simultaneously coat the adhesive layer 40 and the protruding component 30 by employing die coating, slide coating, curtain coating, etc. The coating method when coating each composition for producing the adhesive layer 40 and the protruding component 30 may be one-head coating in multi-layer simultaneous coating or one-pass coating using multiple heads in tandem coating. By manufacturing the adhesive layer 40 and the protruding component 30 using a coating method, the cleaning sheet 1 can be manufactured at a low cost. Furthermore, when manufacturing the protruding component 30 using a coating method, the protruding component 30 may be a continuous layer extending in the planar direction of the cleaning sheet 1, or it may be a discontinuous layer such as a dot pattern. For example, in conventional cleaning sheets manufactured by attaching a nonwoven fabric with openings to an adhesive layer, it is not possible to create a discontinuous layer of nonwoven fabric. In contrast, in this embodiment, the coating pattern of the convex component 30 can be set to improve slipperiness and dust trapping ability. Therefore, it is possible to arbitrarily set the exposure rate of the adhesive layer to 30% or more, which was not possible in conventional cleaning sheets.

[0098] (Use of cleaning sheets) The cleaning sheet 1 described above can be used in a variety of locations, for example, in places where various types of debris such as dust and scraps are present. The cleaning sheet 1, in particular, captures debris with the adhesive force of the adhesive recesses 14 and maintains the capture of debris, and is therefore superior to conventional cleaning sheets made of simple fiber aggregates in capturing relatively heavy debris such as sand grains, food scraps, and hair. Furthermore, the cleaning sheet 1 can be used with good durability not only on indoor flooring, but also on concrete surfaces such as entrance floors and dirt floors where sand grains are present, outdoor balconies, and rough factory floors with large irregularities and anti-slip treatments. Since the cleaning sheet 1 of this embodiment may be a type that does not have a fiber aggregate, such a cleaning sheet 1 prevents the generation of fiber debris and paper dust. Therefore, it is suitable for use in clean rooms, food factories, hospitals, and the like.

[0099] The cleaning sheet 1 described above may be used in a rolled state with the cleaning surface 10 facing outwards. It can be used as a new type of adhesive roll cleaner. Conventional adhesive roll cleaners rotate only in the winding direction, and are used for cleaning by rolling (moving) them only in this direction. Therefore, they were not particularly easy to operate when cleaning in narrow spaces. On the other hand, the new type of adhesive roll cleaner described above can capture dirt not only by rotating in the winding direction, but also by sliding it in directions other than the rotation direction. Therefore, it is easy to operate when cleaning in narrow spaces. When the cleaning sheet 1 is wound into a roll as described above, unraveling may occur. To address this, adhesive or glue may be applied to all or part of the back side (opposite the cleaning surface) of the cleaning sheet 1. This can suppress unraveling.

[0100] (Laminated structure) The cleaning sheet 1 may be in a rolled state, or multiple sheets may be stacked in the thickness direction to form a laminate. An example of a laminate is shown in Figure 8. By fixing the laminate to the sheet fixing part 120, after cleaning work is performed on the cleaning surface 10 of the outermost cleaning sheet 1, the cleaning sheet 1 is removed, and a new, unused cleaning sheet 1 is placed on the outermost side. Therefore, cleaning work can be continued with a new cleaning sheet 1 without having to replace the cleaning sheet 1.

[0101] The matters disclosed herein include the following: (1) A cleaning sheet having a cleaning surface that is rubbed against the surface of the object to be cleaned, The cleaning surface has an uneven surface, and is used by sliding the tip of the protrusions against the object to be cleaned. The aforementioned protrusions are composed of members formed so as to be spaced apart in the planar direction of the cleaning surface. The cleaning surface has a higher adhesive strength than the member and further has adhesive recesses exposed on the cleaning surface, The cleaning surface comprises an adhesive layer that extends in the planar direction and is arranged in at least a portion of the spacing between the members, wherein at least a portion of the adhesive layer constitutes the adhesive recess, and the ratio of the exposed area of ​​the adhesive layer on the cleaning surface is 30% or more. The ratio (H / L) of the average height of the protrusion (H: mm) from the tip of the protrusion to the adhesive recess and the average length of the shape of the adhesive recess in the first direction where the average length of the interval is minimized in the surface direction is 15 × 10 -3 That's all for the cleaning sheet. (2) The cleaning sheet according to (1) above, wherein the ratio of the exposed area of ​​the adhesive layer on the cleaning surface is greater than 50%. (3) The average height (H) of the protrusion from the tip of the protrusion to the adhesive recess is 1000 × 10 -3 A cleaning sheet as described in (1) or (2) above, which is less than or equal to mm. (4) The average height of the protrusion (H) is 500 × 10 -3 A cleaning sheet as described in (3) above, which is less than or equal to mm. (5) The average height (H) of the protrusion is 300 × 10 -3 A cleaning sheet as described in (4) above, which is less than or equal to mm. (6) A cleaning sheet according to any one of (1) to (5) above, wherein the average length (L) of the shape of the adhesive recess in the first direction in which the average length of the interval in the surface direction is minimized is 0.3 mm or more. (7) The cleaning sheet described in (6) above, wherein the average length (L) is 0.5 mm or more. (8) The cleaning sheet described in (7) above, wherein the average length (L) is 0.8 mm or more. (9) The cleaning sheet described in (8) above, wherein the average length (L) is 1.0 mm or more. (10) The cleaning sheet according to any one of (1) to (9) above, wherein the minimum load of the load curve when the member of the protrusion is measured by nanoindentation is -0.40 μN or more and 0 μN or less. (11) The cleaning sheet according to (10) above, wherein the minimum load of the load curve when the member of the protrusion is measured by nanoindentation is -0.10 μN or more and 0 μN or less. (12) The cleaning sheet according to any one of (1) to (11) above, wherein the minimum load of the unloading curve when the member of the protrusion is measured by nanoindentation is -1.50 μN or more and 0 μN or less. (13) The cleaning sheet according to (12) above, wherein the minimum load of the unloading curve when the member of the protrusion is measured by nanoindentation is -0.10 μN or more and 0 μN or less. (14) A cleaning sheet according to any of (1) to (13) above, wherein the static friction coefficient of the cleaning surface is 1.00 or less. (15) The cleaning surface is provided with an adhesive layer that extends in the planar direction and is located on the back side of the member, and a part of the adhesive layer constitutes the adhesive recess, The hardness of the component, as measured by the nanoindentation method, is 0.4 MPa or higher, and the probe tack of the adhesive layer, as measured by the probe tack method, is 1.0 kN / m 2 More than 500.0kN / m 2 The cleaning sheet described in any of the above (1) to (14). (16) The cleaning sheet according to any one of (1) to (15) above, wherein the member of the protrusion contains at least one of wax, cured resin, and inorganic powder. (17) The cleaning sheet according to any one of (1) to (16) above, wherein the member of the protrusion contains at least one of the following: polyolefin resin, ethylene vinyl acetate copolymer resin (EVA), styrene-based thermoplastic elastomer resin, acrylic resin, polyvinyl chloride resin, polyester resin, polyurethane resin, polyimide resin, polyamide resin, and polycarbonate resin. (18) The cleaning sheet according to (16) above, wherein the member of the protrusion contains an extender pigment as the inorganic powder. (19) The cleaning sheet according to (16) above, wherein the hardness of the wax contained in the member of the protrusion is 0.1 or more and 60 or less in terms of penetration. (20) A cleaning sheet according to any one of (1) to (19) above, wherein the cleaning surface is formed on both sides. (21) A method for manufacturing a cleaning sheet as described in any of (1) to (20) above, A method for manufacturing a cleaning sheet, wherein the protruding member is formed by coating. (22) The cleaning sheet has a support base, A method for manufacturing a cleaning sheet according to (21) above, wherein the member of the protrusion is formed on the support substrate by coating. (23) The cleaning sheet comprises a support base and an adhesive layer that overlaps the support base, A method for manufacturing a cleaning sheet according to (21) above, wherein the member of the protrusion is formed by coating it onto the adhesive layer. (24) In a state in which the cleaning sheet described in any of (1) to (20) above is wound, A laminate in which multiple cleaning sheets described in any of (1) to (20) above are stacked in the thickness direction. (25) A cleaning sheet as described in any of (1) to (20) above, A cleaning tool comprising a sheet fixing part to which the cleaning sheet is detachably attached.

[0102] The cleaning sheet 1, laminate, and cleaning tool 100 in the above embodiment are as illustrated above, but the present invention is not limited to the cleaning sheet, laminate, and cleaning tool illustrated above. Furthermore, various forms used in general cleaning sheets and cleaning tools can be adopted, to the extent that they do not impair the effects of the present invention.

[0103] In the cleaning sheet 1 of the above embodiment, the adhesive layer 40 was supported by a support base material 50, but the cleaning sheet of the present invention does not need to have a support base material. For example, the cleaning sheet of the present invention does not have a support base material, and the convex component members 30 may be arranged on both sides of the adhesive layer.

[0104] Furthermore, in the cleaning sheet 1 of the above embodiment, the convex component 30 overlapped the adhesive layer 40, but the cleaning sheet of the present invention is not limited to this configuration. For example, as shown in Figure 2B, the multiple linear members of the convex component 30 may overlap in direct contact with the support base material 50. In this case, the cleaning surface can also be formed by overlapping the linear members of the convex component 30 on the surface of the support base material 50, such as a resin film or nonwoven fabric, with gaps between them, and then filling at least some of the gaps with an adhesive composition. In other words, an adhesive layer does not need to be placed between the support base material 50 and the convex component 30. For example, the cleaning surface can also be formed by forming the multiple linear members of the convex component 30 on the support base material 50 by coating, and then coating the gaps between the formed linear members. Thus, in the cleaning sheet of the present invention, the configuration in which the convex component 30 overlaps the surface of the adhesive layer is not essential.

[0105] Furthermore, in the cleaning sheet 1 of the above embodiment, the exposed area of ​​the adhesive recess 14 (exposed area of ​​the adhesive layer 40) was approximately the same as the total area of ​​the spacing A between the linear members of the convex component 30. However, in the cleaning sheet of the present invention, the exposed area of ​​the adhesive layer 40 may be smaller than the total area of ​​the above-mentioned spacing. For example, the recessed portion formed by the above-mentioned spacing does not have to be entirely occupied by the adhesive composition. Part of the recessed portion may be occupied by a linear (striped) adhesive composition, or by a dotted (dotted) adhesive composition. In this case, if the supporting substrate is a fiber aggregate, dirt can also be captured by the surface of the fiber aggregate exposed on the cleaning surface.

[0106] Furthermore, in the cleaning sheet 1 of the above embodiment, a non-cleaning surface 20 was formed on one side. However, in the cleaning sheet of the present invention, it is not necessarily required that a non-cleaning surface 20 be formed. For example, cleaning surfaces 10 may be formed on both sides of the cleaning sheet.

[0107] The cleaning sheet 1 in the above embodiment had a convex component 30 in which a plurality of linear members (linear members) were arranged in parallel, but the cleaning sheet of the present invention is not limited to this configuration. For example, as shown in Figure 4, the convex component may be a member that is continuous in the planar direction of the cleaning surface 10, and holes (for example, circular or elliptical holes) may be formed in such a member. Furthermore, as shown in Figure 5, for example, the constituent members of the protrusions may be a mesh-like member that is continuous in the planar direction of the cleaning surface 10, and the adhesive layer 40 may be exposed in the mesh. Furthermore, as shown in Figure 6, for example, multiple short line members may be arranged in the longitudinal direction, and the multiple line members may be adjacent to each other in a direction perpendicular to the longitudinal direction, with gaps between them in both the longitudinal and perpendicular directions. Furthermore, as shown in Figure 7, for example, the components of the protruding part may be formed to create multiple characters or pictures. The pattern drawn by the component 30 of the protrusion may be a regular pattern or an irregular pattern. For example, the pattern drawn by the component 30 of the protrusion may be any pattern, such as a dot pattern, a diamond pattern (rhombus shape), or a star pattern (starfish shape). As for the pattern drawn by the component 30 of the protrusion, a pattern that takes into consideration the efficiency of capturing dust may be selected, for example, as shown in Japanese Patent Application Publication No. 2011-183153.

[0108] Furthermore, while the cleaning tool 100 in the above embodiment had a cleaning sheet 1 attached to a sheet fixing part 120 at the lower end of a gripping member 110 with a long handle, it is not limited to this configuration. The cleaning tool of the present invention may have a short handle (also called a holder) as a gripping member. Alternatively, the cleaning tool of the present invention may not have such a gripping member, but may have a cleaning sheet attached to a member (sheet fixing part) having the shape of a plate, sphere, cylinder, etc. The cleaning tool of the present invention may also be a cleaning tool equipped with a soft sheet-like or sponge-like component, such as a cloth. Specifically, the cleaning tool of the present invention may have the above-mentioned cleaning sheet fixed to a part of a soft component, and the desired effects of the present invention can be achieved even with such a configuration. Thus, in the cleaning tool of the present invention, there are no particular restrictions on the shape of the gripping member, sheet fixing part, cleaning sheet, etc., and the materials of each of them are not limited. For example, various materials such as polyolefin, polyester, or other synthetic resins, synthetic fibers or natural fibers, and metals such as stainless steel can be used as component materials for the cleaning tool of the present invention.

[0109] Specifically, the cleaning tool 100 in the above embodiment may be a long, slender rod with a cleaning sheet 1 attached to the end. This cleaning tool 100 is used as a sliding, adhesive-type gap cleaning tool. Furthermore, the cleaning tool 100 in the above embodiment may be, for example, a slipper with a cleaning sheet 1 attached to the bottom surface. Since this cleaning tool 100 has a convex component, it does not stick to the floor and can be used as a product that can be used to clean while walking. In these cleaning devices 100, the attached cleaning sheet 1 may be a single sheet, or it may be a laminate of multiple sheets stacked together.

[0110] The following describes some embodiments of the present invention, but the present invention is not intended to be limited to those examples shown. [Examples]

[0111] (Example 1) [Preparation of adhesive (composition)] A rubber-based adhesive (SIS-based adhesive composition) was prepared by mixing the following raw materials. • Base polymer: Styrene-isoprene-styrene block copolymer (SIS) Manufactured by Zeon Corporation, product name "Quintac 3520" / 100 parts by mass • Tackifying resin: Unhydrogenated hydrocarbon resin Manufactured by ENEOS Product name “T-REZ RC093” / 100 parts by mass • Plasticizer: Naphthenic process oil Idemitsu Kosan Co., Ltd. Product name: "Diana Process Oil NS90S" / 100 parts by mass [Preparation of components for the protrusion (composition for the protrusion)] The composition of Sample 1 for the protruding part was prepared from the following raw materials. • Resin material: High-density polyethylene resin (HDPE) Braskem product name "SHD7255LSL" / 100 parts by mass • Resin material: Ethylene vinyl acetate copolymer resin (EVA) Tosoh Corporation product name "UltraSen 684" / 200 units • Wax: Hydrocarbon-based Sazol Co., Ltd. Product name: Sazol Wax C80, Penetration degree: 4-9 / 450 parts by mass Furthermore, a protruding section (strip-like) having multiple linear members was formed, as schematically shown in Figure 1. In addition, a cleaning sheet was formed to have the schematic shape shown in Figure 2A.

[0112] [Manufacturing of cleaning sheets] As a support substrate, a sheet was prepared by laminating one side of a paper sheet with polyethylene film. Both the adhesive composition and the composition for the raised parts obtained above were hot-melt coated (multi-layer simultaneous coating) using a die coater. The adhesive composition was also directly applied to the unlaminated side. Unless otherwise specified, the cleaning sheets of each embodiment described later, which are manufactured in this manner, have a structure in which the support base material, adhesive layer, and protruding component members are stacked in that order, as shown in Figure 2A. Table 1 shows the configurations of the cleaning sheets in each of the embodiments described later. • Hardness of the constituent material of the protrusion (by nanoindentation method) [MPa] • Elastic modulus of the constituent material of the protrusion (by nanoindentation method) [MPa] • Slope of the load curve in nanoindentation [μN / nm] • Minimum load [μN] of the load curve in the nanoindentation method • Minimum load [μN] of the unloading curve in the nanoindentation method • Displacement amount of the unloading curve in nanoindentation [nm] • Static friction coefficient of the cleaning surface • Dynamic friction coefficient of the cleaning surface • Thickness of the adhesive layer [μm] • Probe tack of the adhesive layer (kN / m 2 ) • Exposure rate of the adhesive layer [%] • Average length L [mm] of the shape of the adhesive recess in the first direction • Distance A [mm] between adjacent wire members • Average protrusion height H [mm] • Ratio (H / L) of average height of protrusions (H: mm) to average length of adhesive recess shape (L: mm) • Average width of the protrusion [mm] • Components of the support base

[0113] The cleaning sheets with the configurations shown in Tables 1 to 5 were manufactured below. Unless otherwise specified, each cleaning sheet was manufactured in basically the same manner as in Example 1.

[0114] (Examples 2-8, 11) The number of wire members and the average height of the protrusions were changed as shown in Tables 1 and 2, respectively, and each cleaning sheet was manufactured.

[0115] (Reference example 9) In Reference Example 9, cleaning sheets were manufactured as follows: [Preparation of adhesive (composition)] Raw materials for acrylic adhesives (adhesive compositions) • Base polymer: Acrylic triblock copolymer / 100 parts by mass Details of acrylic triblock copolymers *Acrylic block copolymer having a triblock structure of poly[methyl methacrylate (MMA)] block - poly[2-ethylhexyl acrylate (2EHA) / n-butyl acrylate (BA)] block - polyMMA block *In the poly2EHA / BA block, the mass ratio of 2EHA to BA is 50 / 50, and the mass ratio [(2EHA+BA) / MMA] between the poly2EHA / BA block and the polyMMA block (two polyMMA blocks) is 82 / 18. *Mw is 10 x 10 4 Mn is 8.4 × 10 4 , Mw / Mn is 1.21 • Plasticizer: Acrylic oligomer (liquid) Manufactured by Toagosei Co., Ltd. Product name "ARUFON UP1021" / 30 parts by mass • Plasticizer: Adipic acid ester type DIC Corporation product name "Monosizer W-242" / 30 units [Preparation of components for the protrusion (composition for the protrusion)] The composition of Sample 2 for the protruding part was prepared using only the following raw materials. • Resin material: Polyolefin elastomer (glass transition temperature -48°C, melting peak top temperature 47°C)

[0116] (Reference example 10) In Reference Example 10, cleaning sheets were manufactured as follows: [Adhesive (composition)] The same example as in Reference Example 9 was used. [Preparation of components for the protrusion (composition for the protrusion)] The composition of Sample 3 for the protruding portion was prepared using only the following raw materials. • Resin material: Polyurethane elastomer (glass transition temperature -50°C, melting peak top temperature 125°C, 166°C, aromatic polyether urethane)

[0117] (Examples 12 and 13) Polypropylene (PP) spunbond nonwoven fabric sheet (manufactured by Asahi Kasei Corporation, product name "Eltas P03040", basis weight 40g / m²) 2 One side of the film is covered with polyethylene film (20g / m²). 2 A sheet laminated with ) was used as a support substrate, and an adhesive composition was applied to the laminated side. A cleaning sheet was formed as schematically shown in Figures 1 and 2A.

[0118] (Example 14) A cleaning sheet with the configuration shown in Table 3 was manufactured using the following composition as the adhesive composition, the composition of Sample 4 below as the composition for the raised parts, and the nonwoven fabric sheet (without lamination) described in Example 12 as the support substrate. Both the adhesive composition and the composition for the raised parts were applied directly to the support substrate, and the raised parts and adhesive layer were formed in a striped pattern, as shown in Figures 1 and 2B. [Preparation of adhesive (composition)] A rubber-based adhesive (SIS-based adhesive composition) was prepared by mixing the following raw materials. • Base polymer: Styrene-isoprene-styrene block copolymer (SIS) Manufactured by Zeon Corporation, product name "Quintac 3520" / 100 parts by mass • Tackifying resin: Unhydrogenated hydrocarbon resin Manufactured by ENEOS Product name “T-REZ RC093” / 130 parts by mass • Plasticizer: Naphthenic process oil Idemitsu Kosan Co., Ltd. Product name: "Diana Process Oil NS90S" / 100 parts by mass [Preparation of components for the protrusion (composition for the protrusion)] The composition of Sample 4 for the protruding part was prepared from the following raw materials. • Resin material: Ethylene vinyl acetate copolymer resin (EVA) Tosoh Corporation product name "UltraSen 684" / 100 parts by mass • Wax: Hydrocarbon-based Sazol Co., Ltd. Product name: Sazol Wax C80, Penetration degree: 4-9 / 225 parts by mass • Mixed raw materials: Polyolefin resin / calcium carbonate mixture (mass ratio 20 / 80) Nitto Funka Kogyo Co., Ltd. Product name "Calpet A" / 250 parts by mass (of which calcium carbonate 200 parts by mass) Then, a protrusion (strip-like) having multiple linear members was formed, as schematically shown in Figure 1. Furthermore, as shown in Figure 2B, the protrusion was formed so that the linear members were in direct contact with the support base material.

[0119] (Example 15) A cleaning sheet with the configuration shown in Table 3 was manufactured using the same adhesive composition as in Example 14, the composition for the raised portion described in Sample 5 below, and the nonwoven fabric sheet described in Example 12 (without lamination) as the support substrate. As shown in Figures 1 and 2B, the raised portion and the adhesive layer were formed in a striped pattern. [Preparation of components for the protrusion (composition for the protrusion)] The composition for Sample 5, intended for the protruding portion, was prepared from the following raw materials. • Resin material: Linear low-density polyethylene resin (LLDPE) Prime Polymer Co., Ltd. Product name "Evolu SP1071C" / 100 parts by mass • Wax: Hydrocarbon-based Sazol Corporation, product name "Sazol Wax C80", penetration degree 4-9 / 143 parts by mass • Mixed raw materials: Polyolefin resin / calcium carbonate mixture (mass ratio 20 / 80) Nitto Funka Kogyo Co., Ltd. Product name "Calpet A" / 143 parts by mass (of which calcium carbonate 114 parts by mass)

[0120] (Examples 16-18) The number of wire members and the average height of the protrusions were changed as shown in Table 3, and each cleaning sheet was manufactured accordingly.

[0121] ( reference Example 19) Using the same adhesive composition as in Example 14, and a polyamide resin (Daicel-Evonik Co., Ltd., product name "Vestamelt 722GETR") as the material for Sample 6 for the protrusions, and using the nonwoven fabric sheet described in Example 12 (without lamination) as the support substrate, a cleaning sheet with the configuration shown in Table 3 was manufactured. As shown in Figures 1 and 2B, the protrusions and adhesive layer were formed in a striped pattern.

[0122] (Reference example 20) Using the same adhesive composition as in Example 14, ethylene vinyl acetate copolymer resin (EVA) (Tosoh Corporation, product name "UltraSen 684") was used as the material for Sample 7 for the protrusions, and the nonwoven fabric sheet described in Example 12 (without lamination) was used as the support base material to manufacture a cleaning sheet with the configuration shown in Table 4. As shown in Figures 1 and 2B, the protrusions and adhesive layer were formed in a striped pattern.

[0123] (Examples 21, 22) [Preparation of adhesive (composition)] A rubber-based adhesive (SIS-based adhesive composition) was prepared by mixing the following raw materials. • Base polymer: Styrene-isoprene-styrene block copolymer (SIS) Manufactured by Zeon Corporation, product name "Quintac 3421" / 100 parts by mass • Tackifying resin: Unhydrogenated hydrocarbon resin Manufactured by ENEOS Product name “T-REZ RC093” / 130 parts by mass • Plasticizer: Naphthenic process oil Idemitsu Kosan Co., Ltd. Product name: "Diana Process Oil NS90S" / 100 parts by mass Using the above composition as the adhesive composition and the composition of Sample 8 below as the composition for the raised parts, a cleaning sheet with the configuration shown in Table 4 was manufactured using the nonwoven fabric sheet (without lamination) described in Example 12 as the support substrate. Both the adhesive composition and the composition for the raised parts were applied directly to the support substrate, and the raised parts and adhesive layer were formed in a striped pattern, as shown in Figures 1 and 2B. [Preparation of components for the protrusion (composition for the protrusion)] The composition for Sample 8, intended for the protruding portion, was prepared from the following raw materials. • Resin material: Linear low-density polyethylene resin (LLDPE) Prime Polymer Co., Ltd. Product name "Evolu SP1071C" / 100 parts by mass • Wax: Hydrocarbon-based Yasuhara Chemical Co., Ltd. Product name "Neowax" Penetration 5 / 143 parts by mass • Mixed raw materials: Polyolefin resin / calcium carbonate mixture (mass ratio 20 / 80) Nitto Funka Kogyo Co., Ltd. Product name "Calpet A" / 143 parts by mass (of which calcium carbonate 114 parts by mass)

[0124] (Examples 23, 24) [Preparation of adhesive (composition)] A rubber-based adhesive (SIS-based adhesive composition) was prepared by mixing the following raw materials. • Base polymer: Styrene-isoprene-styrene block copolymer (SIS) Manufactured by Zeon Corporation, product name "Quintac 3421" / 100 parts by mass • Tackifying resin: Unhydrogenated hydrocarbon resin Manufactured by ENEOS Product name “T-REZ RC093” / 130 parts by mass • Plasticizer: Naphthenic process oil Idemitsu Kosan Co., Ltd. Product name: "Diana Process Oil NS90S" / 80 parts by mass Using the above composition as the adhesive composition and the composition of Sample 8 as the composition for the raised parts, a cleaning sheet with the configuration shown in Table 4 was manufactured using the nonwoven fabric sheet (without lamination) described in Example 12 as the support substrate. Both the adhesive composition and the composition for the raised parts were applied directly to the support substrate, and the raised parts and adhesive layer were formed in a striped pattern, as shown in Figures 1 and 2B.

[0125] (Comparative Examples 1-3) For Sample 9, which is used for the protruding parts, only a polystyrene elastomer (styrene-hydrogenated butadiene copolymer SEBS, glass transition temperature -16°C, melting top peak temperatures 102°C and 121°C) was used as the material, and a cleaning sheet with the configuration shown in Table 5 was manufactured in basically the same manner as in Example 1.

[0126] <Physical properties of the protruding component> As explained below, the following physical properties were measured using the nanoindentation method.

[0127] (Nanoindentation method) The hardness and elastic modulus of the constituent materials of the protrusions were measured in accordance with ISO 14577 using the nanoindentation method. Specifically, the measurements were performed under the following conditions: The indentation depth of the indenter was 5 μm. The measurements were performed at 25°C. At least three measurements were taken and the average value was calculated. The details of the measurement method are as follows: The cleaning sheet was cut in the thickness direction using a trimming knife to extract the components of the protruding parts. Only the components of the protruding parts were used as sample materials for measurement. Under freezing conditions (-30°C), a cross-section was prepared using an ultramicrotome, and then fixed to a designated support (brass stand) to be used as the measurement sample. Equipment: Nanoindenter, "Triboindenter" manufactured by Hysitron. Indenter used: Berkovich type diamond indenter (triangular pyramidal indenter) Measurement mode: Single press mode Measurement temperature: room temperature (25℃) Indentation depth: 5000 nm (5 μm) Pressing speed: 500nm / second Extraction speed: 500 nm / second The following physical properties were calculated from the measurement results. Figure 9A shows the measurement process, and Figure 9B shows a schematic measurement chart. "Hardness" The maximum load Pmax was calculated by dividing the load when the indenter was pressed in to its deepest point by the contact area between the indenter and the sample being measured (contact projection area B). "modulus of elasticity" The tangent to the unloading curve at maximum load (tangential stiffness S = dP / dh) and the contact area between the indenter and the sample being measured (contact projection area B) were used to calculate the tangent to "Slope of the load curve [μN / nm]" This primarily corresponds to the compressive modulus. A higher value indicates greater resistance to deformation under stress. "Minimum load on the load curve [μN]" This is the minimum load value on the load curve. The larger the negative value, the greater the wettability. "Minimum load on the unloading curve [μN]" This is the minimum load value on the unloading curve. The larger the negative value, the greater the adhesive force. "Displacement of the unloading curve [nm]" This represents the change in displacement in the unloading curve. A larger positive value indicates higher stringiness (assuming equivalent adhesion). For some cleaning sheets, the static and dynamic friction coefficients of the cleaning surface were measured using the method described above.

[0128] <Evaluation of slipperiness> One cleaning sheet, manufactured using the above method, was attached to a commercially available wiper jig (Kao Corporation, Quickle Wiper body), and the slipperiness was evaluated by wiping a flooring surface (Daiken Corporation, Living Floor Art LVAT-MF). The evaluation criteria were as follows. ◎: Excellent slipperiness ○: Good slipperiness △: There is some resistance to the floor when starting to slide, but it slides well once it gets going. ×: The floor has strong resistance and does not slide at all, or even if it starts to slide, the resistance is strong.

[0129] <Evaluation of waste capture capabilities> 0.2g of colored sand (CS-1004, 0.1-0.5mm, obtained from Factory M Co., Ltd.) was scattered almost uniformly within a flooring frame measuring 60cm in length and 25cm in width, as simulated waste. One cleaning sheet manufactured as described above was attached to a commercially available wiper jig (Kao, Quickle Wiper body) and wiped over a 60cm distance on a flooring surface (Daiken Corporation, Living Floor Art LVAT-MF) with one back-and-forth motion. Subsequently, the wiped over a 70cm distance with one back-and-forth motion. The dust capture performance (dust capture rate [%], based on mass) was calculated as follows. Dust capture rate [%] = (Mass of sheet after wiping - Mass of sheet before wiping) ÷ Amount of simulated waste scattered (approx. 0.2g) × 100%

[0130] [Table 1]

[0131] [Table 2]

[0132] [Table 3]

[0133] [Table 4]

[0134] [Table 5]

[0135] As shown in Tables 1 to 4, the percentage of the exposed area of ​​the adhesive layer on the cleaning surface is 30% or more, and the ratio (H / L) of the average height of the protrusion from the tip of the protrusion to the adhesive recess (H: mm) to the average length of the shape of the adhesive recess in the first direction where the average length of the spacing in the surface direction of the cleaning surface is minimized is 15 × 10 -3 As described above, the cleaning sheet of the example showed good dust capture ability. On the other hand, the cleaning sheets of each comparative example were inferior in dust capture ability compared to the example.

[0136] As can be seen from the results above, the cleaning surface has an uneven surface, the adhesive recesses (adhesive layer) between adjacent protrusions are exposed, the exposure rate is 30% or more, and the ratio (H / L) mentioned above is 15 × 10 -3 The cleaning sheet described above has at least good dust-catching ability. [Explanation of Symbols]

[0137] 1: Cleaning sheet, 10: Cleaning surface, 12: Convex part, 14: Adhesive recess, 20: Non-cleaning surface, 30: Constituent members of the protruding part, 40: Adhesive layer, 50: Supporting base material, A: interval, 100: Cleaning tools, 110: Gripping member, 120: Seat fixing part, 130: Flexible joint, 140: Radial slits.

Claims

1. A cleaning sheet having a cleaning surface that slides against the surface of the object to be cleaned, The cleaning surface has an uneven surface, and is used by sliding the tip of the protrusions against the object to be cleaned. The aforementioned protrusions are composed of members formed so as to be spaced apart in the planar direction of the cleaning surface. The member of the protrusion contains at least one of wax, cured resin, and inorganic powder. The cleaning surface has a higher adhesive strength than the member and further has adhesive recesses exposed on the cleaning surface, The cleaning surface comprises an adhesive layer that extends in the planar direction and is arranged in at least a portion of the spacing between the members, wherein at least a portion of the adhesive layer constitutes the adhesive recess, and the ratio of the exposed area of ​​the adhesive layer on the cleaning surface is 30% or more. The ratio (H / L) of the average height of the protrusion (H: mm) from the tip of the protrusion to the adhesive recess (L: mm) to the average length of the shape of the adhesive recess in the first direction where the average length of the interval in the surface direction is minimized is 15 × 10 －３ That's all for the cleaning sheet.

2. The cleaning sheet according to claim 1, wherein the ratio of the exposed area of ​​the adhesive layer on the cleaning surface is greater than 50%.

3. The average height (H) of the protrusion from the tip of the protrusion to the adhesive recess is 1000 × 10 －３ A cleaning sheet according to claim 1 or 2, wherein the size is less than or equal to mm.

4. The average height (H) of the aforementioned protrusion is 500 × 10 －３ A cleaning sheet according to claim 3, wherein the size is less than or equal to mm.

5. The average height (H) of the aforementioned protrusion is 300 × 10 －３ A cleaning sheet according to claim 4, wherein the size is less than or equal to mm.

6. The cleaning sheet according to any one of claims 1 to 5, wherein the average length (L) of the shape of the adhesive recess in the first direction in which the average length of the interval in the aforementioned surface direction is minimized is 0.3 mm or more.

7. The cleaning sheet according to claim 6, wherein the average length (L) is 0.5 mm or more.

8. The cleaning sheet according to claim 7, wherein the average length (L) is 0.8 mm or more.

9. The cleaning sheet according to claim 8, wherein the average length (L) is 1.0 mm or more.

10. The cleaning sheet according to any one of claims 1 to 9, wherein the minimum load of the load curve when the member of the protrusion is measured by nanoindentation is -0.40 μN or more and 0 μN or less.

11. The cleaning sheet according to claim 10, wherein the minimum load of the load curve when the member of the protrusion is measured by nanoindentation is -0.10 μN or more and 0 μN or less.

12. The cleaning sheet according to any one of claims 1 to 11, wherein the minimum load of the unloading curve when the member of the protrusion is measured by nanoindentation is -1.50 μN or more and 0 μN or less.

13. The cleaning sheet according to claim 12, wherein the minimum load of the unloading curve when the member of the protrusion is measured by nanoindentation is -0.10 μN or more and 0 μN or less.

14. The cleaning sheet according to any one of claims 1 to 13, wherein the static friction coefficient of the cleaning surface is 1.00 or less.

15. The probe tack of the adhesive layer, as measured by the probe tack method, is 1.0 kN / m ２ More than 500.0kN / m ２ The cleaning sheet according to any one of claims 1 to 14, as follows:

16. The cleaning sheet according to claim 1, wherein the member of the protrusion contains an extender pigment as the inorganic powder.

17. The cleaning sheet according to any one of claims 1 to 16, wherein the cleaning surface is formed on both sides.

18. A method for manufacturing a cleaning sheet according to any one of claims 1 to 17, A method for manufacturing a cleaning sheet, wherein the protruding member is formed by coating.

19. The cleaning sheet has a support base, A method for manufacturing a cleaning sheet according to claim 18, wherein the member of the protrusion is formed by overlapping it with the support substrate by coating.

20. The cleaning sheet comprises a support base material and an adhesive layer that overlaps the support base material. A method for manufacturing a cleaning sheet according to claim 18, wherein the member of the protrusion is formed by overlapping it with the adhesive layer by coating.

21. A state in which the cleaning sheet described in any one of claims 1 to 17 is wound, or A laminate in which a plurality of cleaning sheets according to any one of claims 1 to 17 are stacked in the thickness direction.

22. A cleaning sheet according to any one of claims 1 to 17, A cleaning tool comprising a sheet fixing part to which the cleaning sheet is detachably attached.

Images