KR20230132851A - cleaning sheets and cleaners - Google Patents

Abstract

A cleaning sheet is provided that can accurately remove both liquid and solid foreign substances such as water that may be present on a surface to be cleaned. A cleaning sheet having a first side and a second side is provided. The cleaning sheet includes a base material having an absorbent layer at least on the front surface, and an adhesive partially disposed on the absorbent layer. The first surface includes a cleaning surface having a first area where the adhesive is exposed and a second area where the absorbent layer is exposed. The cleaning sheet has an absorption amount of 0.5 g/dm2 or more.

Description

cleaning sheets and cleaners

The present invention relates to a cleaning sheet and a cleaner equipped with the cleaning sheet. This application claims priority based on Japanese Patent Application No. 2021-12195 filed on January 28, 2021, and the entire contents of the application are incorporated herein by reference.

As a means of cleaning floors, carpets, etc., adhesive cleaners, which capture foreign substances such as dust and dirt present on the surface to be cleaned with an adhesive, are widely used. For example, a roll-shaped capturing member (adhesive roll) whose outer circumference is an adhesive surface is provided, and the roll is rolled while the adhesive surface is in contact with the surface to be cleaned to capture and remove foreign matter on the surface to be cleaned. Adhesive cleaners configured to be able to do so are known. As technical documents disclosing this type of sticky cleaner, patent documents 1 and 2 can be cited.

Japanese Patent Application Publication No. 2018-000745 Japanese Utility Model Publication No. 61-160856

However, due to the usage patterns of washrooms and changing rooms, etc., there are many cases where foreign matter such as hair or fiber fragments falls on the floor surface. Additionally, their bottom surfaces are likely to become wet due to water splashing or droplets. Patent Document 2 proposes an adhesive tape for cleaners that can effectively adhesively collect dust on a wet floor, but there is room for further examination in order to obtain a product that is practically satisfactory.

Therefore, the purpose of the present invention is to provide a cleaning sheet that can accurately remove both liquid and solid foreign substances such as water that may exist on the surface to be cleaned. Another related invention is to provide a cleaner equipped with such a cleaning sheet.

According to this specification, a cleaning sheet having a first side and a second side is provided. The cleaning sheet includes a base material having an absorbent layer at least on the front surface, and an adhesive partially disposed on the absorbent layer. The first surface of the cleaning sheet includes a cleaning surface having a first area where the adhesive is exposed and a second area where the absorbent layer is exposed. The cleaning sheet has an absorption amount of 0.5 g/dm2 or more. Here, “dm” represents “decimeter.”

The cleaning sheet of this configuration has a cleaning surface having the first area (adhesive exposed area) and the second area (absorbent layer exposed area) on its first surface, so that water, etc., is separated from the surface to be cleaned by the cleaning surface. It is possible to remove liquid and solid foreign substances at the same time. Additionally, since the cleaning sheet is configured to ensure a predetermined or higher absorption amount, it can be cleaned efficiently even if the surface to be cleaned is wet.

The cleaning sheet according to some embodiments is preferably configured as an adhesive sheet where the cleaning surface is an adhesive surface. According to this configuration, it is easy to achieve both liquid removal and solid foreign matter removal at a high level.

The base material may further include a waterproof layer disposed on the back side of the absorbent layer. By providing a waterproof layer on the back side of the absorbent layer, the liquid absorbed on the first side of the cleaning sheet can be prevented from spreading on the second side. As a result, for example, in a roll-shaped cleaning sheet or a plurality of stacked cleaning sheets, it is possible to prevent the liquid from expanding to a range that does not directly contact the surface to be cleaned. Additionally, for example, in a form in which only one cleaning sheet is used, it is possible to prevent the liquid from adhering to members or fingers in contact with the second surface of the cleaning sheet.

In some embodiments, it is preferable that the interlayer strength of the waterproof layer and the absorbent layer is approximately 0.5 N/25 mm or more. This makes it easy to prevent inadvertent separation of the waterproof layer and the absorbent layer.

In some embodiments, the tearing strength of the cleaning sheet is preferably approximately 1.0 N or more. This makes it easy to prevent vertical cracking when, for example, the outer peripheral surface of the cleaning roll around which the cleaning sheet is wound is renewed, and the wound outer peripheral end (turning portion) of the cleaning sheet is lifted from the inner peripheral cleaning sheet.

In some embodiments, the cleaning sheet has a cut portion extending in a direction intersecting the long side direction of the cleaning sheet (for example, the width direction). By providing such a cut portion, it becomes easy to separate a part of the cleaning sheet from the remainder using the cut portion, thereby improving the ease of use of the cleaning sheet.

The cleaning sheet disclosed herein may be configured as a cleaning roll by being wound with the cleaning surface facing outward. This cleaning roll is used, for example, in a manner that rolls over the surface to be cleaned, and can efficiently remove liquid and solid foreign substances on the surface to be cleaned.

According to this specification, there is provided a cleaner including a cleaning roll in which any of the cleaning sheets disclosed herein is wound with the cleaning surface facing outward, and a jig for rotatably supporting the cleaning roll. The cleaner is used in such a way that the cleaning roll rolls over the surface to be cleaned, and can efficiently remove liquid and solid foreign substances on the surface to be cleaned.

In addition, appropriate combinations of each element described in this specification may also be included in the scope of the invention for which protection by patent is sought by this application.

Fig. 1 is a perspective view schematically showing a cleaning roll in which a cleaning sheet according to one embodiment is wound with the cleaning surface facing outward.
FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.
Fig. 3 is a front view schematically showing a cleaner according to one embodiment.
FIG. 4 is a diagram showing arrows in the direction IV of FIG. 3.
Fig. 5 is a perspective view schematically showing a cleaning roll in which a cleaning sheet according to another embodiment is wound with the cleaning surface facing outward.

Hereinafter, preferred embodiments of the present invention will be described. In addition, matters other than those specifically mentioned in this specification and matters necessary for practicing the present invention can be understood by those skilled in the art based on the teachings regarding the implementation of the invention described in this specification and the technical common sense at the time of filing the application. The present invention can be implemented based on the content disclosed in this specification and common technical knowledge in the field. In addition, in the drawings below, members and parts that exert the same function may be described with the same reference numerals, and overlapping descriptions may be omitted or simplified. In addition, the embodiments described in the drawings are modeled to clearly explain the present invention, and do not necessarily accurately represent the size or scale of the actually provided product.

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

The cleaning sheet 10 is tape-shaped (long strip-shaped) having a first side 10A and a second side 10B, a base material 20 having an absorbent layer 22, and a partial portion on the absorbent layer 22. It is provided with an adhesive 31 arranged as. The base material 20 further includes a waterproof layer 24 disposed on the back side of the absorbent layer 22. The surface of the waterproof layer 24 may be subjected to a known peeling treatment (for example, a peeling treatment using a silicone-based peeling agent).

The width center portion of the first surface 10A of the cleaning sheet 10 includes a first area where the adhesive 31 is exposed (adhesive exposed area) and a second area where the absorbent layer 22 is exposed (absorbent layer exposed area) ( It becomes a cleaning surface 11 having 32). In this embodiment, the first region is formed partially on the absorbent layer 22, more specifically, by the adhesive 31 disposed in stripes substantially parallel to the long side direction of the cleaning sheet 10, The space between each line of the stripe becomes the second area 32. Both ends of the first surface 10A in the width direction serve as adhesive non-disposition portions 12 and 13 where the adhesive 31 is not disposed.

In addition, in this embodiment, as well shown in FIG. 2, the adhesive 31 is applied so that the upper end of the adhesive 31 protrudes higher than the surface of the absorbent layer 22 (i.e., the first area protrudes more than the second area). ) is disposed, but the height relationship between the first area and the second area is not limited to this. The first area may be lower than the second area, and the first area and the second area may be of approximately the same height. For example, by providing a concave portion on the front side of the absorbent layer and filling the adhesive to fill part or all of the depth of the concave portion, the first region is lower than the second region or the first region is equal to or equal to the second region. A cleaning surface of approximately the same height can be formed. In some embodiments, it is preferable that the first region protrudes more than the second region, or that the first region and the second region are at approximately the same height. The cleaning sheet configured in this way has good removal properties of solid foreign substances because the adhesive can be easily brought into direct contact with the surface to be cleaned when the cleaning surface is brought into contact with the surface to be cleaned. For example, the capturing ability of solid foreign substances (e.g., hair, lint, etc.) of a size spanning the plurality of first regions is excellent. Additionally, according to the configuration in which the first region protrudes more than the second region, the side surface in addition to the top surface of the first region can also be used to capture solid foreign substances, which is preferable. In addition, for convenience of explanation, the adhesive 31 and the absorbent layer 22 are divided by a straight line in FIG. 2. However, for example, when the absorbent layer 22 is porous, at least a portion of the adhesive 31 is formed by the absorbent layer 22. ) can be infiltrated and deployed.

The cleaning roll 1 is formed by winding the cleaning sheet 10 around the winding core 40 in a roll shape with the cleaning surface 11 facing the outside (outer peripheral side of the roll). In Figure 1, for convenience of explanation, a length corresponding to approximately one turn of the cleaning roll 1 is drawn from the winding outer peripheral end (turning portion) 16 of the cleaning sheet 10. It indicates the status. When the surface performance of the cleaning roll 1 (for example, the capturing performance or absorption performance of the object to be removed) deteriorates, the cleaning sheet 10 is pulled out (rewinded) from the cleaning roll 1 and cut. , a new cleaning surface 11 can be exposed on the surface of the cleaning roll 1. That is, the cleaning roll 1 is configured to maintain its performance by updating the surface through the drawing and cutting. For convenience of such cutting, the cleaning sheet 10 is provided with cutting portions 14 for cutting at approximately every length of the cleaning roll 1. The cutting portion 14 is a cutting means used to easily cut one end of the cleaning sheet 10 in the direction of the long side from the remainder, for example, an arrangement of long holes or wavy slits, or intermittent slits such as a seam line. It may be, etc.

In some embodiments, the cut portion 14 has a length measured from the winding outer peripheral end 16 along the long side direction of the cleaning sheet 10 slightly longer than one circumferential length of the cleaning roll 1 (e.g. It is desirable to provide it in a position where it is elongated (about 2mm to 10mm). According to this configuration, the cut portion 14 on the outermost periphery of the cleaning roll 1 is covered by the cleaning sheet 10 constituting the outermost periphery of the cleaning sheet 1, and is in direct contact with the surface to be cleaned. There is no case for doing so. Therefore, by pulling out the cleaning sheet 10 from the cleaning roll 1 used on the surface to be wet cleaned and cutting it through the cut portion 14, the absorbed area of the cleaning sheet 10 is removed, and the remaining cleaning roll 1 ) can be kept dry. It is desirable to provide the cut portion 14 so that this relationship is maintained to approximately the same extent from the inner circumference to the outer circumference of the cleaning roll 1.

Furthermore, in the example shown in FIG. 1, the cut portion 14 is provided along the width direction (direction perpendicular to the long side direction) of the cleaning sheet 10, but may be provided at an angle with respect to the width direction. The direction in which the cut portion extends may be constant or may be changed along the way. For example, one or two or more portions may be provided along the width of the cleaning sheet where the direction in which the cut portion extends is bent linearly or curvedly. Furthermore, in the example shown in FIG. 1, the cutting portion 14 is provided across the entire width of the cleaning sheet 10, but the cutting portion 14 is also provided to provide an opportunity for cutting by extending from one side of the width of the cleaning sheet to the middle. do.

As the winding core 40 of the cleaning roll 1, one made of paper (typically made of cardboard) can be preferably used from the viewpoints of cost, ease of disposal, cushioning properties, etc. Alternatively, the winding core may be made of another material (for example, synthetic resin, metal, etc.). Additionally, a so-called coreless type cleaning roll may be used, which is formed by winding only the cleaning sheet into a roll without using a winding core. That is, in the cleaning roll disclosed herein, the winding core is an arbitrary component.

The cleaning roll 1 is, for example, a jig 50 as shown in FIGS. 3 and 4, and a cleaner 100 in which the cleaning roll 1 is installed on the rotating member 52 of the jig 50. ) can be used as a component of. The rotating member 52 is rod-shaped and is rotatably supported on one end of the rod-shaped holding member 54. The cleaner 100, for example, inserts the rotating member 52 into a cavity provided at the winding center of the cleaning roll 1 (in an embodiment having a winding core, it may be a cavity of the winding core), thereby forming the cleaning roll. (1) is configured to rotate in the direction around the roll in conjunction with the rotation member 52. The cleaner 100 holds the other end of the holding member 54, brings the outer peripheral surface of the cleaning roll 1 into contact with the surface of the cleaning target surface 56, and cleans the surface along the cleaning target surface 56. It can be preferably used in an aspect in which the roll 1 is rolled.

In addition, the form of the jig that constitutes the cleaner together with the cleaning roll is not limited to that shown in FIGS. 3 and 4, and various types of jigs can be applied depending on the purpose and use. For example, in the form shown in FIGS. 3 and 4, the holding member 54 extends in the radial direction of the cleaning roll 1, but the holding member may extend along the winding axis of the cleaning roll, and the holding member 54 may extend along the winding axis of the cleaning roll. It may extend in a direction such that the angle formed between the two is approximately 60 degrees or less, or 45 degrees or less, or 30 degrees or less. In addition, the cleaner provided by this specification is not limited to a form including a jig and a cleaning roll as shown in FIG. 3, and the cleaning roll may be used as a cleaner as is. In other words, the cleaning roll can also be understood as a cleaner. Additionally, the cleaning roll disclosed herein may be a cleaning roll (refillable cleaning roll) that can be replaced with an appropriate jig as needed or installed in a disposable form to constitute a cleaner.

The cleaning sheet disclosed herein may be used in a form that is not wound into a roll, for example, in a sheet form. For example, a sheet-fed cleaning sheet can be installed in an appropriate jig, or the cleaning sheet alone can be used as a cleaner without using a jig. The sheet-shaped cleaning sheet may be used in the form of only one sheet, or may be used in the form of a laminate of two or more sheets. The above laminate can be used in such a way that one cleaning sheet located on the outermost surface is brought into contact with the surface to be cleaned. When one of the outermost surfaces is peeled off from the remaining laminate, a new cleaning sheet becomes the outermost surface of the laminate. As a result, the outermost surface of the laminate can be updated. Additionally, contrary to the example shown in FIG. 1, the cleaning sheet disclosed herein may be configured as a cleaning roll wound with the cleaning surface facing inward. By pulling out (rewinding) the cleaning sheet from this type of cleaning roll and cutting it to an appropriate length, a sheet-fed cleaning sheet is obtained. The sheet-shaped cleaning sheet can be used as a cleaner by installing it in an appropriate jig or alone without using a jig.

<Absorption amount>

The cleaning sheet disclosed herein is characterized by an absorption amount of 0.5 g/dm2 or more. In a cleaning sheet provided with a cleaning surface having an adhesive exposed area (first area) and an absorbent layer exposed area (second area), when the absorption amount is 0.5 g/dm2 or more, liquid such as water and solid foreign matter are removed from the surface to be cleaned. can also be efficiently removed at the same time.

From the viewpoint of increasing the liquid removal efficiency, the absorption amount of the cleaning sheet is preferably 0.7 g/dm2 or more, more preferably 0.9g/dm2 or more, may be 1.0g/dm2 or more, and may be 1.2g/dm2 or more. It may be 1.5 g/d㎡ or more. The upper limit of the absorption amount is not particularly limited, and may be, for example, 8 g/dm 2 or less. In some embodiments, from the viewpoint of maintaining a good balance between the liquid removal performance and the solid foreign matter removal performance by the adhesive while suppressing the thickness of the cleaning sheet, the water absorption amount may be, for example, 5.0 g/dm2 or less, It may be 3.5 g/dm2 or less, and may be 2.5g/dm2 or less. The water absorption amount of the cleaning sheet is measured by the method described in the Examples described later. The absorption amount of the cleaning sheet can be adjusted by selection of the absorption layer, the area ratio of the first region to the cleaning surface (adhesive area ratio), the amount of adhesive applied to the absorption layer, etc.

<Absorption layer>

The cleaning sheet disclosed herein includes a substrate, and the substrate has an absorbent layer at least on the front surface. In other words, at least the front surface of the substrate is comprised of an absorbent layer. The entire substrate may be comprised of an absorption layer. In this type of substrate, the back side of the substrate is also composed of an absorbent layer.

As the absorbent layer, one having absorbent performance capable of constructing a cleaning sheet with the above-mentioned absorbent amount is used. Therefore, it is appropriate that the absorption amount of the absorption layer is approximately 0.5 g/dm 2 or more, and it is advantageous that it is approximately 0.5 g/dm 2 or more. In some embodiments, the absorption amount of the absorption layer is preferably approximately 1.0 g/dm2 or more, more preferably approximately 1.3g/dm2 or more, may be approximately 1.5g/dm2 or more, or approximately 1.8g/d. It may be more than ㎡. The upper limit of the absorption amount of the absorption layer is not particularly limited, and may be, for example, approximately 10.0 g/dm 2 or less. From the viewpoint of suppressing the strength and thickness of the cleaning sheet, in some embodiments, the absorption amount of the absorbent layer may be approximately 7.0 g/dm 2 or less, approximately 5.0 g/dm 2 or less, or approximately 3.0 g/dm 2 or less. It's okay. The water absorption amount of the absorbent layer is measured in the same manner as the water absorption amount of the cleaning sheet, except that a test piece is used in which the absorbent layer (for example, non-woven fabric) is cut into a square shape with 10 cm on each side. The absorption amount of the absorption layer can be adjusted by selecting the material, structure, basis weight, etc. of the absorption layer.

In some preferred embodiments, the absorbent layer is porous. The porous absorbent layer tends to exhibit the desired absorbency while suppressing volume change and strength decrease due to absorption, compared to, for example, a non-porous absorbent layer that mainly absorbs by swelling. This is desirable from the viewpoint of preventing the adhesive from falling off due to absorption (which can be a factor in causing the adhesive to remain on the surface to be cleaned). For the same reason, the adhesive used in the cleaning sheet disclosed herein can preferably be one that is non-water soluble and non-water swellable.

A suitable example of a porous absorbent layer includes an absorbent layer made of various fiber aggregates. Here, in this specification, a fiber aggregate is a concept that includes a material composed of one or a small number of fibers accumulated in addition to a material composed of a large number of fibers integrated. Such fiber aggregates generally maintain their form as aggregates by physical actions such as entanglement, crossing, and binding of fibers and/or chemical actions such as fusion, welding, binding by binders, and bonding by chemical reactions. It is configured to do so. The fiber aggregate may be referred to as non-woven fabric, woven fabric, paper, felt, etc. The material of the fibers constituting the fiber aggregate is not particularly limited, and includes various natural fibers (typically cellulose-based fibers such as cotton) and chemical fibers (synthetic fibers, semi-synthetic fibers, regenerated fibers such as rayon, inorganic fibers, etc. ) can be appropriately selected. The material of the fibers constituting the fiber aggregate may be one type or two or more types. Examples of absorbent layers that can be preferably employed from the viewpoint of absorbency, flexibility, affinity with adhesives, etc. include cotton nonwoven fabric and rayon nonwoven fabric. From the viewpoint of surface updating workability, etc. when the cleaning sheet disclosed herein is in the form of a cleaning roll, cotton nonwoven fabric is more preferable.

Another example of a porous absorption layer is an absorption layer made of foam with an open cell structure. As the foam, for example, polyurethane foam, polyvinyl alcohol (PVA) foam, etc. can be used.

The basis weight of the absorption layer is not particularly limited and can be appropriately selected so as to realize a cleaning sheet with the desired absorption amount. In some embodiments, the basis weight of the absorbent layer is preferably 15 g/m 2 or more, more preferably 25 g/m 2 or more, and may be 30 g/m 2 or more, or 35 g/m 2 or more. As the basis weight of the absorbent layer increases, the water absorption amount and tear strength of the cleaning sheet having the absorbent layer tend to increase. Additionally, in some embodiments, the basis weight of the absorbent layer may be, for example, 150 g/m 2 or less, 100 g/m 2 or less, 80 g/m 2 or less, or 60 g/m 2 or less. Reducing the basis weight of the absorption layer is desirable from the viewpoint of reducing the thickness of the cleaning sheet and saving resources.

<Adhesive>

On the absorbent layer, an adhesive is partially disposed. As a result, a cleaning surface is formed on the first surface of the cleaning sheet, having a first area where the adhesive is exposed and a second area where the absorbent layer is exposed. The cleaning surface may be the entire area of the first surface of the cleaning sheet, or may be the area excluding a part of it. For example, as shown in FIGS. 1 and 2, adhesive non-disposition portions 12 and 13 where the adhesive is not disposed and which do not constitute a cleaning surface may be provided along both ends of the substrate 20 in the width direction. The width of the non-adhesive portions 12 and 13 can be, for example, about 3 mm to 20 mm (typically 5 mm to 15 mm). The widths of the adhesive non-placed portions 12 and 13 may be the same or different. The adhesive non-disposition portion may be provided only on one end of the substrate 20 in the width direction. By providing an adhesive non-disposition portion on at least one end side in the width direction of the substrate, for example, when renewing a cleaning sheet exposed to the outermost periphery of the cleaning roll, it is easy to pinch the wound outer periphery end (turning portion) of the cleaning sheet and withdraw it from the roll. Effects such as easy cutting of one cleaning sheet can be realized. The adhesive-non-disposed portion may be provided continuously or intermittently only for a portion of the total length of the substrate.

The area ratio of the first area to the entire area of the cleaning surface (hereinafter also referred to as “adhesive area ratio”) is calculated using the following formula: [(Total area of the first area)/(Total area of the first area + Second area) Total area of)] × 100; The adhesive area ratio can be, for example, 5% or more, preferably 10% or more, 15% or more, 25% or more, 35% or more, or 45% or more. As the adhesive area ratio increases, the ability to capture solid foreign substances tends to improve. In addition, in some embodiments, the adhesive area ratio is suitably 95% or less, preferably 85% or less, may be 75% or less, 65% or less, and may be 55% or less. do. As the adhesive area ratio decreases, the absorption amount of the cleaning sheet generally tends to increase.

The arrangement of the first area on the cleaning surface is not particularly limited, and may be, for example, stripe-shaped, dot-shaped (plural dots or islands), grid-shaped, or a combination of these patterns. The arrangement pattern of the first area may be regular or random. The arrangement pattern of the first area may be the same over the entire cleaning surface, or may vary depending on the position (for example, position in the width direction). From the viewpoint of ease of manufacturing and ease of forming a cleaning roll, it is advantageous to use the same arrangement pattern over the entire cleaning surface. Additionally, the first area may be provided approximately evenly over the entire range of the cleaning surface, and density may be generated depending on the position (e.g., position in the width direction) by, for example, adjusting the arrangement frequency or size of the pattern. It may be provided. From the viewpoint of ease of manufacturing the cleaning sheet, shape accuracy when forming the cleaning roll, etc., a configuration in which the first area is provided substantially evenly over the entire cleaning surface can be preferably adopted. The arrangement pattern of the first area can be controlled, for example, by the arrangement pattern of the adhesive. In addition, it is advantageous that the arrangement of the first region and the arrangement of the adhesive are consistent from the viewpoint of ease of manufacture, etc., but are not limited to this.

In some preferred embodiments, for example, as shown in Figures 1 and 2, the first region is formed by adhesives arranged substantially parallel to each other (in stripes) at intervals in the width direction of the cleaning sheet. . In this type of cleaning sheet, the configuration (cross-sectional shape) of each part in the long side direction of the cleaning sheet is constant, so that the cleaning roll wound around the cleaning sheet is applied on the application surface (cleaning target surface). This is preferable because there is little variation in the feeling of use (response) when electric. That is, the transmission can be performed smoothly. This is also advantageous from the viewpoint of preventing cleaning stains.

In an embodiment in which the adhesive is arranged in stripes, the width (width of the first region) W1 of the adhesive constituting each line of the stripe is not particularly limited and can be designed according to the application. In some embodiments, the width W1 (see Fig. 2) of the adhesive can be, for example, approximately 0.1 mm or more, and from the viewpoint of improving the trapping ability of solid foreign substances, it is advantageous to set it to approximately 0.3 mm or more, and approximately It may be 0.5 mm or more, or approximately 0.7 mm or more. The width W1 can be, for example, approximately 20 mm or less. From the viewpoint of suppressing stains from removal of liquid on the surface to be cleaned, it is appropriate to set it to approximately 10 mm or less, preferably approximately 5 mm or less, and approximately 2 mm. You can do it below. The spacing (width of the second area) W2 between adjacent lines is suitably set to approximately 0.1 mm or more, preferably approximately 0.3 mm or more, and approximately 0.5 mm or more or approximately 0.7 mm or more from the viewpoint of increasing absorbency. You can do it. The width W2 (see FIG. 2) can be, for example, approximately 20 mm or less. From the viewpoint of suppressing stains from removal of solid foreign substances on the surface to be cleaned, it is appropriate to set it to approximately 10 mm or less, and approximately 5 mm or less. It is preferable, and may be approximately 2 mm or less.

In the embodiment in which the adhesive is arranged in a dot shape, the shape of the dot is not particularly limited, for example, circular, oval, oval, fan-shaped (e.g. semi-circular), ring-shaped, quadrangular (square, rectangular, trapezoidal, rhombus, etc.), polygons other than squares (triangles, hexagons, etc.), shapes representing various designs, symbols, letters, etc., and shapes that combine one or two or more of these. The area of each dot can be, for example, approximately 0.1 mm2 or more, and is preferably approximately 0.5 mm2 or more from the viewpoint of trapping solid foreign substances. It may be approximately 1 mm2 or more, or approximately 3 mm2 or more, or approximately 6 mm2. It can be more than that. In addition, from the viewpoint of suppressing stains from removal of liquid on the surface to be cleaned, the area of each dot can be, for example, approximately 300 mm2 or less, and is preferably approximately 100 mm2 or less (e.g., approximately 30 mm2 or less). desirable. The distance between each dot and the adjacent dot can be, for example, about 0.1 mm to 10 mm (typically about 0.5 mm to 5 mm, for example, about 1 mm to 3 mm).

The amount of adhesive contained per area of the cleaning surface is not particularly limited, and can be appropriately set so that the desired absorption amount is realized and the solid foreign matter removal effect is appropriately exhibited. In some embodiments, the amount of adhesive per area of the cleaning surface can be, for example, 3 g/m2 or more, preferably 5 g/m2 or more from the viewpoint of coating stability, etc., may be 10 g/m2 or more, and may be 15 g/m2 or more. It may be more than /㎡. In addition, the amount of adhesive per area of the cleaning surface may be, for example, 120 g/m 2 or less, and is preferably 90 g/m 2 or less from the viewpoint of appropriately suppressing the adhesive force to facilitate cleaning operations, and may be 70 g/m 2 or less. , may be 50 g/m 2 or less, and may be 30 g/m 2 or less. The amount of adhesive contained per area of the cleaning surface can be determined from the difference between the weight per area of the base material and the weight per area of the cleaning sheet in the range where the cleaning surface is formed. The amount of the adhesive can be adjusted by the amount of adhesive applied per area of the first region or the adhesive area ratio.

Although not particularly limited, the amount of adhesive per area of the first region can be, for example, 5 g/m2 or more, and is preferably 10 g/m2 or more from the viewpoint of coating stability, etc., may be 15 g/m2 or more, or 25 g. It may be more than /㎡. Additionally, the amount of adhesive per area of the first region may be, for example, 150 g/m 2 or less, and is preferably 120 g/m 2 or less from the viewpoint of appropriately suppressing the adhesive force to facilitate cleaning operations, and may be 100 g/m 2 or less. , may be 70 g/m 2 or less, and may be 50 g/m 2 or less.

<Waterproof layer>

The base material may include a waterproof layer disposed on the back side of the absorbent layer, that is, on the side opposite (back side) to the side on which the adhesive layer is provided. The waterproof layer may be a non-porous resin layer (for example, a resin film), a foam layer with a closed cell structure, a metal foil, or a composite thereof. A waterproofing layer containing a non-porous resin layer is preferable because it is easy to increase the interlayer strength described later. Here, the non-porous resin layer refers to a layer in which the ratio of the volume of pores (voids) to the apparent volume of the layer is 3% by volume or less at 25°C. Examples of the resin material constituting the non-porous resin layer include polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); Polyolefin resins such as polyethylene (PE), polypropylene (PP), ethylene-propylene copolymer, and polypropylene-polyethylene blend resin; Others include vinyl chloride resin (typically soft vinyl chloride resin), vinyl acetate resin, and polyamide-based resin; These can be mentioned, but are not limited to these. In some embodiments, a waterproof layer made of polyolefin resin at least on the back side can be preferably employed.

The thickness of the waterproof layer is not particularly limited. The thickness of the waterproof layer may be, for example, 1 μm or more, and from the viewpoint of making it easy to realize a cleaning sheet with appropriate strength (e.g., tear strength, interlayer strength, etc.), it is appropriate that it is 5 μm or more, and is 10 μm or more. It is preferable, and it is more preferable that it is 15㎛ or more. In addition, the thickness of the waterproof layer may be, for example, 100 μm or less, preferably 50 μm or less from the viewpoint of flexibility and thinning of the cleaning sheet, more preferably 30 μm or less, and may be 25 μm or less, and may be 20 μm or less. It may be 15㎛ or less.

In some embodiments, the back of the substrate is comprised of a waterproof layer (for example, a resin layer such as a resin film). A peeling treatment, such as application of a peeling treatment agent, may be performed on the back of the substrate. The peeling agent is not particularly limited, and for example, silicone-based peeling agents, fluorine-based peeling agents, long-chain alkyl-based peeling agents, and other known or common peeling agents can be used depending on the purpose or use. By the peeling treatment, for example, the rewinding force of the roll-shaped cleaning sheet can be adjusted.

<Interlayer strength>

In some embodiments, it is preferable that the interlayer strength of the waterproof layer and the absorbent layer is, for example, approximately 0.5 N/25 mm or more. This makes it easy to prevent inadvertent separation of the waterproof layer and the absorbent layer. This is particularly meaningful for cleaning sheets where the cleaning surface is an adhesive surface. It is more preferable that the interlayer strength is approximately 1.0 N/25 mm or more (for example, approximately 1.5 N/25 mm or more, furthermore, 2.0 N/25 mm or more). The upper limit of the interlayer strength is not particularly limited, and the higher it is, the more advantageous it is from the viewpoint of preventing the waterproof layer and the absorbent layer from being inadvertently separated. In some embodiments, the interlaminar strength may be, for example, approximately 10 N/25 mm or less. The interlayer strength can be measured by performing a T-shaped peel test by the method described in the Examples described later. In this method, when the waterproof layer cannot be peeled off from the absorbent layer by hand in preparation for measurement, it can be evaluated as having a sufficiently high interlayer strength for practical use. In addition, in measuring the interlayer strength, the T-shaped peel test is used regardless of whether peeling occurs at the interface between the waterproof layer and the absorbent layer or is destroyed inside the absorbent layer (for example, whether a part of the absorbent layer remains on the waterproof layer side). The resulting measurements are recorded as interlaminar strength. Therefore, in addition to the bonding strength at the interface between the waterproof layer and the absorbent layer, the value of the interlayer strength may also be influenced by the internal destruction prevention property of the absorbent layer (which may be an absorbent layer partially impregnated with an adhesive).

<Cleaning sheet>

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

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

The width of the cleaning surface formed on the first surface of the cleaning sheet is preferably approximately 2.5 cm or more, may be approximately 4.5 cm or more, may be approximately 9.5 cm or more, may be approximately 11 cm or more, or may be approximately 13 cm or more. The width of the cleaning surface can be, for example, approximately 98 cm or less, preferably approximately 68 cm or less from the viewpoint of ease of use, may be approximately 48 cm or less, approximately 39 cm or less, approximately 34.5 cm or less, and further approximately 29.5 cm or less ( For example, it may be approximately 24.5 cm or less). The technology disclosed herein can be preferably implemented in a form where the width of the cleaning surface is, for example, approximately 9.5 cm or more and approximately 48 cm or less (preferably approximately 13 cm or more and approximately 39 cm or less).

(Tearing Strength)

In some embodiments, the tearing strength of the cleaning sheet is preferably approximately 1.0 N or more, for example. As a result, for example, when renewing the outer peripheral surface of a cleaning roll wound with a cleaning sheet whose cleaning surface is an adhesive surface, the wound outer peripheral end portion (turn portion) of the cleaning sheet is peeled from the inner peripheral cleaning sheet. It becomes easier to prevent vertical cracks, and the workability of renewing the outer peripheral surface improves. That is, when an attempt is made to peel the winding outer peripheral end of a cleaning sheet from a cleaning roll with hair, lint, etc. attached beyond the winding outer peripheral end of the cleaning sheet, the hair, lint, etc. will get caught and the cleaning sheet will be separated from the winding outer peripheral end by the long side. There are cases where it splits directionally (vertically). It is advantageous for the cleaning sheet to have a tear strength of a predetermined value or more from the viewpoint of suppressing the vertical cracking. It is preferable that the said tearing strength is 2.0N or more, and it is more preferable that it is 3.0N or more (for example, 4.0N or more). Tear strength is measured by the method described in the Examples described later. In addition, the vertical cracking can be prevented by using reinforcing means such as a lead tape, which will be described later.

(adhesiveness)

The cleaning sheet disclosed herein is preferably configured as an adhesive sheet where the cleaning surface is an adhesive surface. According to this configuration, it is easy to achieve both liquid removal and solid foreign matter removal at a high level. Here, the fact that the cleaning surface is an adhesive surface means that the adhesive force (hereinafter also referred to as “adhesive force to SUS”) measured by pressing the cleaning surface to a stainless steel (SUS) plate is 0.05 N/25 mm or more. In a cleaning sheet whose cleaning surface is an adhesive surface, it is preferable that the first area of the cleaning surface protrudes or is at approximately the same height as the second area.

The adhesion to the SUS is measured by a 180 degree peel test specified in JIS Z 0237 using a SUS304BA plate as the adherend. Adhesion to SUS is specifically measured in the following procedure. That is, a test piece is prepared by cutting the cleaning sheet to be measured into a strip about 25 mm wide and 100 to 200 mm long. The cleaned surface of the test piece is attached to a SUS304BA board as an adherend by rotating a 2 kg roller once. After keeping this in an environment of 23°C and 50% RH for 30 minutes, peeling was performed at 180 degrees using a tensile tester at a tensile speed of 300 mm/min in an environment of 23°C and 50% RH, based on JIS Z 0237. Measure the strength (N/25mm). Measurements are performed two or more times (preferably three or more times), and their arithmetic average value is taken as the value of adhesive force. The tensile tester is not particularly limited, and a known tensile tester can be used. For example, it can be measured using “Tensilon” manufactured by Shimadzu Seisakusho.

In some embodiments, from the viewpoint of improving the performance of capturing solid foreign substances, it is appropriate that the adhesive force of the cleaning surface to the SUS is 0.1 N/25 mm or more, and 0.5 N/25 mm or more (for example, 1.0 N/25 mm or more) It is desirable to be On the other hand, from the viewpoint of suppressing adhesive residue on the surface to be cleaned and damage to the surface to be cleaned, it is appropriate that the adhesive force of the surface to be cleaned to the SUS is 5.0 N/25 mm or less, and is 3.0 N/25 mm. It is preferable that it is less than 2.0N/25mm, and it is more preferable that it is less than 2.0N/25mm, for example, it may be 1.5N/25mm or less. The adhesive force to SUS can be adjusted, for example, by the amount of adhesive contained per area of the cleaning surface, the adhesive area ratio, etc.

<Cleaning Roll>

The cleaning sheet disclosed herein may be configured as a cleaning roll by being wound with the cleaning surface facing outward. This cleaning roll is used, for example, in a manner that rolls over the surface to be cleaned, and can efficiently remove liquid and solid foreign substances on the surface to be cleaned. The cleaning sheet used in this aspect is preferably configured as an adhesive sheet whose cleaning surface is an adhesive surface from the viewpoint of the ability to maintain the shape of the cleaning roll during rolling.

Although it is not particularly limited, the diameter of the cleaning roll may be, for example, approximately 10 mm or more, usually 20 mm or more is appropriate, and may be 30 mm or more, 40 mm or more, or 50 mm or more. Here, the diameter of the cleaning roll refers to the diameter (outer diameter) of the cleaning roll when not in use (that is, before the start of use of the product). The diameter of the cleaning roll may be, for example, approximately 200 mm or less. From the viewpoint of operability, etc., approximately 150 mm or less is usually appropriate, and may be 100 mm or less, approximately 80 mm or less, or approximately 70 mm or less.

The inner peripheral diameter of the cleaning sheet constituting the cleaning roll may be, for example, approximately 5 mm or more, and usually approximately 10 mm or more is appropriate, and may be approximately 20 mm or more. Here, the inner circumferential diameter of the cleaning sheet refers to the winding diameter at the winding start end of the cleaning sheet, and in a cleaning roll in which the cleaning sheet is wound around a winding core, it is approximately equal to the outer diameter of the winding core. The inner circumferential diameter of the cleaning sheet may be, for example, approximately 180 mm or less, approximately 130 mm or less, approximately 90 mm or less, approximately 70 mm or less, or approximately 60 mm or less.

The cleaning sheet constituting the cleaning roll may be provided with a shape that allows the cleaning roll to be visually recognized when viewed from the outer circumference side. Here, shape includes shapes, symbols, letters, combinations thereof, and combinations of these with colors. In some embodiments, the shape may be such that misalignment occurs between the wound outer peripheral end of the cleaning sheet and the surface of the cleaning sheet adjacent to the wound outer peripheral end. By creating misalignment of this shape, the effect of making it easier to find the outer peripheral end of the winding of the cleaning sheet is achieved. Making it easy to find the end (turning portion) of the winding outer periphery of the cleaning sheet can help improve work efficiency, for example, when renewing the adhesive exposed to the outermost periphery of the cleaning roll. The form of the shape is not particularly limited, and may be, for example, lines or dots that extend continuously or intermittently in the longitudinal direction of the cleaning sheet or in a direction intersecting the longitudinal direction. The line may be a straight line, curved line, broken line, broken line, etc. The thickness of the line may be constant or may vary regularly or irregularly. Additionally, the mismatch of the above shapes may be, for example, a difference in color. In addition, as a method of making it easier to find the winding outer peripheral end of the cleaning sheet, in addition to the method of using shape mismatch as described above, for example, a pattern (e.g., a colored line extending along the cut portion) is applied to the cleaning sheet along the cut portion. ), a method of giving a shape to the side facing the inner periphery of the winding of the cut part, a method of giving a shape to both sides with the cut part in between (e.g., opposing triangles with the cut side as the vertex), etc. possible, and is not particularly limited. These methods may be appropriately combined.

The cleaning sheet may be provided with a sign indicating the recommended rolling direction for the cleaning roll. The recommended rolling direction is generally a direction in which the portion of the cleaning sheet located on the outermost periphery of the cleaning roll is rolled so that it contacts the surface to be cleaned in the order from the inner end of the winding of the cleaning sheet to the outer end of the winding. The sign is not particularly limited as long as it can convey the intended information to the user. For example, it may be a symbol such as an arrow or a figure such as an instruction mark, or a letter, or a combination thereof.

(Rewind power)

The rewinding force of the cleaning roll disclosed here is not particularly limited, and can be, for example, approximately 2.0 N/25 mm or less. From the viewpoint of workability when intentionally pulling out a cleaning sheet for the purpose of updating the cleaning surface appearing on the outer periphery of the cleaning roll, etc., it is appropriate that the rewinding force is approximately 1.5 N/25 mm or less, and is preferably approximately 1.0 N/25 mm or less. And, it is more preferable that it is approximately 0.7N/25mm or less. In some embodiments, the rewinding force may be, for example, approximately 0.5 N/25 mm or less, approximately 0.3 N/25 mm or less, or approximately 0.2 N/25 mm or less. In addition, the rewinding force of the cleaning roll may be, for example, 0.005 N/25 mm or more, and from the viewpoint of suppressing rail pulling, etc., it is appropriate to be approximately 0.01 N/25 mm or more, and may be approximately 0.02 N/25 mm or more, or approximately 0.05 N. It can be more than /25mm.

The rewinding force of the cleaning roll is measured as follows. That is, in an environment of 23°C and 50% RH, the cleaning roll to be measured is set in the tensile tester, and the wound outer peripheral end of the cleaning sheet is attached to the chuck of the tensile tester and pulled at a speed of 300 mm/min (rewind speed). , rewind the cleaning roll in the tangential direction. At this time, the rewinding force [N/25mm] can be obtained by converting the observed tensile strength into a value per 25mm width of the cleaning surface.

(Rail pulling prevention part)

In some embodiments, the cleaning sheet constituting the cleaning roll may be provided with a rail pulling prevention portion in which the adhesiveness of the cleaning surface of the cleaning sheet is partially suppressed. The rail pulling refers to a phenomenon in which, when a cleaning roll is transferred on a surface to be cleaned, the rewinding force is lost to the adhesive force between the cleaning sheet and the surface to be cleaned, and the cleaning sheet is stuck to the surface to be cleaned, causing the roll to unwind. It is effective to arrange the rail pulling prevention portion in an area near the end of the winding outer circumference of the cleaning sheet. In one aspect, the rail pulling prevention portion can be disposed within a range of 1/4 circumference (preferably 1/6 circumference, more preferably 1/8 circumference) along the outer circumference of the cleaning roll from the end of the winding outer circumference of the cleaning sheet. there is. The rail pulling phenomenon of the cleaning roll occurs starting from the end of the winding outer circumference of the cleaning sheet. Therefore, by suppressing the adhesiveness of the cleaning sheet in the vicinity of the outer peripheral end of this winding, the relationship between the adhesive force to the surface to be cleaned and the adhesive force to the back of the cleaning sheet (which may be related to the rewinding force) is locally adjusted, and the rail The occurrence of pulling can be effectively prevented. When the cleaning sheet constituting the cleaning roll is set to be cut at a location to be cut (e.g., the cut portion 14 shown in FIG. 1), the rail pulling prevention portion is cleaned at each scheduled to be cut location (i.e., the cut portion 14 shown in FIG. 1). By cutting the sheet, it can be placed within a range of 1/4 circumference along the outer circumference of the cleaning roll from the point that can become the end of the outer circumference of the winding.

The rail pulling prevention portion is preferably formed continuously or intermittently so as to extend in a direction intersecting the long side direction of the cleaning sheet (typically the width direction). According to the rail pulling prevention portion of this shape, the rail pulling phenomenon can be effectively prevented while suppressing a decrease in the capturing performance or absorption performance of solid foreign substances. In one aspect, a rail pulling prevention portion can be formed along an end of the outer periphery of the winding of the cleaning sheet at a position on the side facing the inner periphery of the winding of the cleaning sheet. The rail pulling prevention portion may be provided over the entire length of the outer peripheral end of the winding, or may be provided continuously or intermittently along a portion of the entire length.

The configuration of the rail pulling prevention portion is not particularly limited as long as it can partially suppress the adhesive force on the cleaning surface. For example, in the cleaning roll of the type shown in FIG. 1, as shown in FIG. 5, the adhesive surface 11 on the side that contacts the end of the outer circumference of the winding of the cleaning sheet and faces the inner circumference of the winding is non-adhesive or low-adhesive. A rail pulling prevention portion can be formed by attaching the lead tape 18 made of a sheet-like member having an outer surface of . In this embodiment, a similar lead tape 18 is disposed on the adhesive surface on the side facing the inner periphery of the winding in contact with each cut portion. The lead tape 18 is not particularly limited, and for example, various resin films, paper, cloth, rubber sheets, foam sheets, metal foils, and composites thereof can be used. The shape of the lead tape 18 can be, for example, a strip as shown in FIG. 5, but is not limited to this, and can be any shape that extends in the width direction of the cleaning sheet.

By arranging such a lead tape, in addition to preventing rail pulling, it is possible to prevent the cleaning sheet from splitting (vertically splitting) in the long side direction from the end of the winding outer circumference when the outer circumferential surface (adhesive surface) of the cleaning roll is renewed. By arranging the lead tape at a position on the side facing the inner circumference of the winding of the winding outer peripheral end of the cleaning sheet (and the location that can become the winding outer peripheral end by cutting the cleaning sheet from the cut portion), the outer peripheral end of the winding can be reinforced with the lead tape. You can. This makes it easier to peel the cleaning sheet from the cleaning roll to which hair, lint, etc. are attached, and the workability of updating the outer peripheral surface (adhesive surface) of the cleaning roll is improved. From this viewpoint, in one aspect, a lead tape with higher strength (tensile strength, tear strength, etc.) than the cleaning sheet can be preferably used. For example, a lead tape made of a resin film such as PET or PP can be used. The resin film constituting the lead tape may contain an antistatic agent to make it difficult for dust to adhere. In one aspect, a lead tape colored in a different color from the cleaning sheet can be preferably used. As a result, it is possible to easily determine the position of the wound outer peripheral end or cut portion of the cleaning sheet.

The width of the rail pulling prevention portion can be, for example, 1 mm or more, and is usually appropriate to be 2 mm or more (for example, 3 mm or more). By increasing the width of the rail pulling prevention portion, the rail pulling prevention performance tends to improve. The width of the rail pulling prevention portion can be, for example, 50 mm or less. From the viewpoint of maintaining adhesion performance and preventing unwinding, it is generally appropriate to set the width of the rail pulling prevention portion to 30 mm or less, and preferably 15 mm or less (for example, 10 mm or less). Additionally, the rail pulling prevention portion may be provided at a position on the side facing the outer circumference of the winding from the planned cutting point (end side of the outer circumference of the winding) in addition to the position on the side facing the inner periphery of the winding from the planned cutting point. For example, the rail pulling prevention portion may be provided to extend beyond the intended cutting location and along the corresponding cutting location.

<Examples of adhesive>

The adhesive used in the cleaning sheet disclosed herein is not particularly limited. As the adhesive, for example, an acrylic adhesive, a rubber adhesive, a polyester adhesive, a urethane adhesive, a polyether adhesive, a silicone adhesive, etc. can be used. Here, the rubber-based adhesive refers to an adhesive that contains a rubber-based polymer as a base polymer. The same goes for other adhesives. In addition, in this specification, the base polymer refers to the main component (the component with the highest mixing ratio) among the polymer components. The proportion of the base polymer in the polymer component contained in the adhesive disclosed herein is typically approximately 50% by weight or more, usually approximately 70% by weight or more, and may be approximately 90% by weight or more, based on solid content. . The upper limit of the proportion of the base polymer is 100% by weight, for example, it may be approximately 99% by weight or less.

The form of the adhesive is not particularly limited, and for example, a hot melt type applied in a heated and melted state, an active energy ray curing type cured by an active energy ray, and an aqueous dispersion type in which the adhesive component is dispersed in water (typically an emulsion type). ), and solvent-based adhesives in which the adhesive component is dissolved in an organic solvent. Preferred adhesives from the viewpoint of productivity and environmental load reduction include hot melt adhesives and active energy ray curable adhesives. Among them, hot melt type adhesives are preferable.

The method of partially disposing the adhesive on the absorbent layer of the substrate is not particularly limited, for example, a method of forming an adhesive layer by directly applying the adhesive to the substrate (direct method), or applying the adhesive layer formed on an appropriate peeling surface to the substrate. A transcription method (transcription method) can be used. For coating the adhesive, conventionally known coating means such as a die coater or a gravure coater can be used. When a hot melt adhesive is used to form the adhesive layer, the hot melt adhesive can be applied in the form of a heated melt that substantially does not contain an organic solvent.

In some embodiments, from the viewpoint of adhesive performance and cost, a rubber-based adhesive or an acrylic adhesive can be preferably used as the adhesive. A rubber-based adhesive and an acrylic adhesive may be used in combination by mixing (blending) or lamination. Hereinafter, the rubber-based adhesive and acrylic adhesive that can be used in the cleaning sheet disclosed herein will be described in more detail, but it is not intended to limit the scope of the present invention.

(Rubber adhesive)

Examples of rubber-based adhesives include natural rubber-based polymers such as natural rubber and its modified products, isoprene rubber, chloroprene rubber, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene. / Rubber systems such as butylene-styrene block copolymer (SEBS), crystalline polyolefin-ethylene/butylene-crystalline polyolefin block copolymer (CEBC), and styrene-ethylene/butylene-crystalline polyolefin block copolymer (SEBC) An adhesive containing one or two or more types of polymers as a base polymer can be mentioned. A suitable example of a rubber-based adhesive is an adhesive that uses SIS as a base polymer (SIS-based adhesive).

A rubber-based adhesive (for example, an SIS-based adhesive) may contain, for example, a tackifying resin (tackifier) and process oil as main components in addition to a rubber-based polymer as a base polymer. The type and mixing ratio of each component can be set so that the desired solid foreign matter capturing performance is obtained on the cleaning surface.

As tackifying resins, various tackifying resins such as general rosin-based, terpene-based, hydrocarbon-based, epoxy-based, polyamide-based, elastomer-based, phenol-based, ketone-based, etc. can be used alone or in an appropriate combination of two or more types. You can use it. Although not particularly limited, the blending amount of the tackifying resin relative to 100 parts by weight of the base polymer may be, for example, approximately 40 parts by weight or more, approximately 70 parts by weight or more, or approximately 100 parts by weight or more. In addition, the amount of the tackifying resin per 100 parts by weight of the base polymer is suitably, for example, approximately 250 parts by weight or less, preferably approximately 200 parts by weight or less, from the viewpoint of avoiding deterioration of low-temperature properties. It may be approximately 160 parts by weight or less, approximately 140 parts by weight or less, and approximately 120 parts by weight or less.

As the process oil, for example, general paraffin-based, naphthenic-based, aromatic-based process oils can be used individually or in an appropriate combination of two or more types. Although not particularly limited, the blending amount of the process oil per 100 parts by weight of the base polymer can be, for example, approximately 30 parts by weight or more, approximately 50 parts by weight or more, or approximately 70 parts by weight or more. In addition, the amount of process oil mixed with respect to 100 parts by weight of the base polymer can be, for example, approximately 200 parts by weight or less, and from the viewpoint of preventing contamination of the surface to be cleaned, etc., it is preferably approximately 150 parts by weight or less. It may be 120 parts by weight or less, approximately 100 parts by weight or less, and approximately 80 parts by weight or less.

Rubber-based adhesives (for example, SIS-based adhesives) may further contain various additives such as anti-aging agents, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, and colorants (pigments, dyes, etc.). The types and mixing amounts of these additives can be similar to the usual types and mixing amounts in the general adhesive field.

(Acrylic adhesive)

An acrylic adhesive is an adhesive that contains an acrylic polymer as a base polymer. Here, the acrylic polymer means that 50% by weight or more (preferably 70% by weight or more, for example 90% by weight or more) of the total amount of monomer components constituting the polymer contains at least one (meth)acryloyl group per molecule. It refers to a polymer that is a monomer (hereinafter, this may be referred to as “acrylic monomer”). In addition, in this specification, (meth)acryloyl group is meant to comprehensively refer to acryloyl group and methacryloyl group. Likewise, in this specification, (meth)acrylate is meant to comprehensively refer to acrylates and methacrylates.

The acrylic polymer may be a random copolymer, a block copolymer, a graft copolymer, etc., if the monomer component constituting the polymer contains two or more types of monomers. Preferred acrylic polymers from the viewpoint of ease of production and ease of adjustment of adhesive properties include random copolymers and block copolymers. Acrylic polymers can be used individually or in combination of two or more types.

In a preferred embodiment, the acrylic polymer includes an acrylic random copolymer synthesized from a monomer raw material containing an alkyl (meth)acrylate having an alkyl group as a main monomer. As the alkyl (meth)acrylate, an alkyl (meth)acrylate having a chain alkyl group of 1 to 20 carbon atoms at the ester terminal, that is, C _1-20 alkyl (meth)acrylate, can be preferably used. From the viewpoint of the storage modulus of the adhesive, etc., C _1-12 (for example, C _2-10 , typically C _4-8 ) alkyl (meth)acrylate is preferred. These can be used individually or in combination of two or more types. Preferred alkyl (meth)acrylates include n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, and lauryl (meth)acrylate. Rates, etc. can be mentioned. Among them, it is preferable to use one or both of n-butylacrylate (BA) and 2-ethylhexyl acrylate (2EHA).

The proportion of the main monomer in the total monomer components constituting the acrylic random copolymer is preferably approximately 60% by weight or more, more preferably approximately 80% by weight or more, and even more preferably approximately 90% by weight or more. The upper limit of the proportion of the main monomer in the total monomer component is not particularly limited, but from the viewpoint of facilitating adjustment of the properties of the adhesive (adhesion, cohesion, etc.), it is usually approximately 99% by weight or less (e.g., approximately 98% by weight). Hereinafter, it is preferably approximately 95% by weight or less). The acrylic random copolymer may be obtained by substantially polymerizing only the main monomer.

The monomer raw material may further include, in addition to the main monomer, a parent monomer copolymerizable with the main monomer for the purpose of controlling the properties of the adhesive. A suitable example of such a parentomer is a monomer having a functional group (hereinafter also referred to as a functional group-containing monomer). Examples of functional group-containing monomers include carboxyl group-containing monomers, acid anhydride group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, alkoxy group-containing monomers, and alkoxysilyl group-containing monomers. These can be used individually or in combination of two or more types. Preferred functional group-containing monomers include carboxyl group-containing monomers such as acrylic acid and methacrylic acid because it is easy to introduce a crosslinking point into the acrylic polymer and easy to control the crosslinking density; Hydroxyl group-containing monomers such as 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate; etc. can be mentioned. The amount of the functional group-containing monomer (for example, a carboxyl group-containing monomer) used may be, for example, approximately 1 to 10% by weight, approximately 2 to 8% by weight, or approximately 3 to 3% by weight, based on the total monomer components for synthesizing the acrylic polymer. It may be 7% by weight.

The monomer raw material may contain monomers other than the functional group-containing monomers as parent monomers, for example, for the purpose of increasing the cohesion of the acrylic polymer. Examples of such monomers include vinyl ester monomers such as vinyl acetate and vinyl propionate; Aromatic vinyl compounds such as styrene, α-methylstyrene, and vinyl toluene; Cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate and isobornyl (meth)acrylate; etc. can be mentioned. These can be used individually or in combination of two or more types. The amount of parentomers other than the functional group-containing monomer may be appropriately selected depending on the purpose and use and is not particularly limited, but for example, it is approximately 20% by weight or less (e.g., 2 to 20% by weight) of the total monomer components for synthesizing an acrylic polymer. It is preferable to set it to about % by weight, typically about 3 to 10% by weight.

In another preferred aspect, the acrylic polymer includes an acrylic block copolymer. The acrylic block copolymer may exhibit the properties of a thermoplastic polymer (typically a thermoplastic elastomer). An adhesive containing such an acrylic block copolymer as a base polymer can be suitable for coating in a hot melt format. It is preferable to use a hot melt type adhesive to form the adhesive layer from the viewpoint of productivity and environmental load reduction. From the viewpoint of reducing melt viscosity, etc., acrylic block copolymers with a straight-chain structure are more advantageous than those with a star-shaped structure or branched structure.

The acrylic block copolymer preferably includes, for example, at least one acrylate block (hereinafter also referred to as Ac block) and at least one methacrylate block (hereinafter also referred to as MAc block) in one molecule. can be hired. The Ac block is a monomer unit in which approximately 50% by weight or more, preferably approximately 75% by weight or more, of the total monomer units constituting the Ac block is derived from alkyl acrylate. The MAc block is a monomer unit in which approximately 50% by weight or more, preferably approximately 75% by weight or more, of the total monomer units constituting the MAc block is derived from alkyl methacrylate.

Examples of the alkyl acrylate constituting the Ac block include C _1-20 alkyl acrylate. Ac blocks containing C _4-14 alkyl acrylates as constituent monomer units are preferred, and Ac blocks containing C _4-9 alkyl acrylates are more preferred. As suitable examples of C _4-9 alkyl acrylate, BA, 2EHA, n-hexyl acrylate, n-octylacrylate, isooctyl acrylate (IOA), n-nonyl acrylate and isononyl acrylate (INA). I can hear it. For example, an Ac block containing at least one of BA and 2EHA is preferred.

In a preferred embodiment, the proportion of C _4-14 alkyl acrylate in the monomer units constituting the Ac block is, for example, 50% by weight or more, may be 75% by weight or more, or is substantially 100% by weight (e.g. , may exceed 99% by weight and be 100% by weight or less). For example, a configuration in which the monomer unit constituting the Ac block is essentially BA alone, a configuration in which the monomer unit is essentially 2EHA alone, or a configuration in which the monomer unit constituting the Ac block consists of two types of BA and 2EHA can be preferably adopted. In an embodiment in which the monomer unit constituting the Ac block contains both BA and 2EHA, the weight ratio of BA and 2EHA is not particularly limited. The weight ratio of BA/2EHA is, for example, 10/90 to 90/10, preferably 80/20 to 20/80, more preferably 30/70 to 70/30, and may also be 60/40 to 40/60. do.

Examples of the alkyl methacrylate constituting the MAc block include C _1-20 (preferably C _1-14 ) alkyl methacrylate. The proportion of C _1-4 (preferably C _1-3 ) alkyl methacrylate among the monomers constituting the MAc block may be, for example, approximately 50% by weight or more, approximately 75% by weight or more, and may be substantially 100% by weight. It may be % by weight (for example, more than 99% by weight and less than or equal to 100% by weight). Among these, preferred alkyl methacrylates include methyl methacrylate (MMA) and ethyl methacrylate (EMA). For example, a configuration in which the monomer unit is essentially MMA alone, a configuration in which the monomer unit is substantially only EMA, or a configuration in which the monomer unit consists of two types of MMA and EMA can be preferably adopted.

In one embodiment, the ratio of C _6-12 alkyl acrylate and C _2-5 alkyl acrylate is 20/80 to 80/20 (more preferably 30/70 to 70/30, more preferably 40/60 to 60). An acrylic block copolymer having an Ac block composed of monomer units containing a weight ratio of /40, for example, 45/55 to 55/45, may be used. Such an acrylic block copolymer can have an excellent balance between low-temperature performance and cohesiveness. For example, an acrylic block copolymer having an Ac block composed of monomer units containing 2EHA and BA in the above weight ratio can be preferably used. The Ac block may be composed of only 2EHA and BA.

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

Monomers other than alkyl (meth)acrylate (other monomers) may be copolymerized in the acrylic block copolymer. Examples of the other monomers include vinyl compounds having functional groups such as alkoxy groups, epoxy groups, hydroxyl groups, amino groups, amide groups, cyano groups, carboxyl groups, and acid anhydride groups, vinyl esters such as vinyl acetate, aromatic vinyl compounds such as styrene, and N- Examples include vinyl group-containing heterocyclic compounds such as vinylpyrrolidone. The content of the other monomers may be approximately 20% by weight or less, approximately 10% by weight or less, or approximately 5% by weight or less of the total monomer components constituting the acrylic block copolymer. In a preferred embodiment, the acrylic block copolymer contains substantially no other monomers. For example, an acrylic block copolymer in which the content of the above-mentioned other monomers is less than 1% by weight of the total monomer component (typically 0 to 0.5% by weight) or below the detection limit is preferable.

These acrylic block copolymers can be easily synthesized by known methods (for example, see Japanese Patent Application Laid-Open No. 2001-234146 and Japanese Patent Application Laid-Open No. 11-323072), or are commercially available products. can be easily obtained. Examples of the commercially available products include the “Clarity” series manufactured by Kuraray Corporation (for example, those with product numbers LA2140e, LA2250, etc.) and the “NABSTAR” manufactured by Kaneka Corporation.

The acrylic adhesive may contain a tackifier as needed. As the tackifier, various tackifier resins such as general rosin-based, terpene-based, hydrocarbon-based, epoxy-based, polyamide-based, elastomer-based, phenol-based, ketone-based, etc. can be used individually or in combination of two or more types as appropriate. Can be used in combination. The blending amount of the tackifying resin per 100 parts by weight of the base polymer may be, for example, approximately 1 part by weight or more, approximately 5 parts by weight or more, or approximately 10 parts by weight or more. In addition, from the viewpoint of avoiding deterioration of low-temperature properties, the appropriate amount of tackifier to be used per 100 parts by weight of the base polymer is usually approximately 50 parts by weight or less, may be approximately 30 parts by weight or less, and may be approximately 20 parts by weight or less. It may be approximately 10 parts by weight or less. The adhesive need not contain substantially a tackifier.

The acrylic adhesive may contain a plasticizer as needed. Plasticizers can be helpful in suppressing adhesion and lowering melt viscosity. Examples of plasticizers include phthalic acid esters such as dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, and dibutyl phthalate; Adipic acid esters such as dioctyl adipate and diisononyl adipate; trimellitic acid esters such as trioctyl trimellitic acid; Sebacic acid ester; Epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil; Epoxidized fatty acid alkyl esters such as epoxidized fatty acid octyl ester; Cyclic fatty acid esters and derivatives thereof such as sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, and ethylene oxide adducts thereof; etc. can be mentioned. Additionally, softeners such as process oils are also included in plasticizers. Plasticizers can be used individually or in combination of two or more types. The amount of plasticizer used is not particularly limited, and can be, for example, approximately 1 part by weight or more, approximately 5 parts by weight or more, approximately 7 parts by weight or more, or approximately 10 parts by weight or more with respect to 100 parts by weight of the base polymer. Additionally, from the viewpoint of preventing contamination of the surface to be cleaned, it is appropriate that the amount of plasticizer used per 100 parts by weight of the base polymer is approximately 100 parts by weight or less, may be approximately 50 parts by weight or less, and may be approximately 30 parts by weight or less. It may be approximately 10 parts by weight or less. The adhesive need not contain substantially any plasticizer.

In addition, even in adhesives other than acrylic adhesives (for example, rubber-based adhesives), the above-mentioned plasticizer can be contained in an appropriate amount as needed.

The acrylic adhesive may further contain various additives such as anti-aging agents, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, and colorants (pigments, dyes, etc.). The types and mixing amounts of these additives can be similar to the usual types and mixing amounts in the general adhesive field.

<Use>

The cleaning sheet disclosed herein can be applied to cleaning various surfaces to be cleaned. For example, taking advantage of the ability to accurately remove all liquid and solid foreign substances that may exist on the surface to be cleaned, cleaning floors and walls in washrooms, changing rooms, prefabricated bathrooms, toilets, kitchens, etc. It can be preferably used.

Matters disclosed by this specification include the following.

[1] A cleaning sheet having a first side and a second side,

A substrate having an absorbent layer at least on the front surface, and an adhesive partially disposed on the absorbent layer,

The first surface includes a cleaning surface having a first area where the adhesive is exposed and a second area where the absorbent layer is exposed,

A cleaning sheet with an absorption amount of 0.5 g/d㎡ or more.

[2] The cleaning sheet according to [1], wherein the cleaning surface is configured as an adhesive sheet where the adhesive surface is an adhesive surface.

[3] The cleaning sheet according to [1] or [2], wherein the base material further includes a waterproof layer disposed on the back side of the absorbent layer.

[4] The cleaning sheet according to [3], wherein the waterproof layer is made of polyolefin resin at least on the back side.

[5] The cleaning sheet according to [3] or [4] above, wherein the back of the base material is comprised of a waterproof layer.

[6] The cleaning sheet according to any of [3] to [5] above, wherein the interlayer strength of the waterproof layer and the absorbent layer is 0.5 N/25 mm or more.

[7] The cleaning sheet according to any of [1] to [6] above, wherein the cleaning sheet has a tear strength of 1.0 N or more.

[8] The cleaning sheet according to any of [1] to [7], wherein the cleaning sheet has a cut portion extending in a direction intersecting the long side direction of the cleaning sheet.

[9] The cleaning sheet according to any of [1] to [8] above, which is configured as a cleaning roll by being wound with the cleaning surface facing outward.

[10] The cleaning sheet according to any of [1] to [9], wherein the absorbent layer is porous.

[11] The cleaning sheet according to any of [1] to [10], wherein the absorbent layer is a non-woven fabric.

[12] The cleaning sheet according to [11], wherein the absorbent layer is a cotton non-woven fabric.

[13] [1] to [12] above, wherein the area ratio (adhesive area ratio) of the first region to the cleaning surface is 5% or more and 95% or less, 15% or more and 85% or less, or 35% or more and 75% or less. The cleaning sheet described in any of the above.

[14] The cleaning sheet according to any of [1] to [13], wherein the first region is provided in a stripe shape.

[15] The cleaning sheet according to any of [1] to [14] above, wherein the cleaning surface has an adhesive force to SUS of 0.1 N/25 mm or more and 5 N/25 mm or less.

[16] The cleaning sheet according to any of [1] to [15] above, wherein the adhesive is a rubber adhesive or an acrylic adhesive.

[17] The cleaning sheet according to [16], wherein the adhesive is a rubber-based adhesive (for example, an SIS-based adhesive).

[18] a cleaning roll in which the cleaning sheet according to any of [1] to [17] is wound with the cleaning surface facing outward;

A jig that rotatably supports the cleaning roll.

Equipped with a cleaner.

Example

Hereinafter, several embodiments of the present invention will be described, but it is not intended to limit the present invention to these specific examples.

<Example 1>

A polyethylene (PE) sheet with a thickness of 20 μm is laminated on the back of nonwoven fabric F1 (“Oikos AP2040” manufactured by Nisshinbo Textiles, cotton nonwoven fabric manufactured by the spunlace method, basis weight 40 g/m2, water absorbent), and the PE A base material S1 with a width of 160 mm was prepared, the sheet surface of which was subjected to a peeling treatment using a silicone-based peeling agent. By coating the SIS-based adhesive in a stripe form on the nonwoven fabric surface (front surface) of this substrate S1 in a molten state, an adhesive-coated area (first area) with a width of 1 mm and an adhesive-free area (second area) with a width of 1 mm are formed. Alternating cleaning surfaces were formed (adhesive area ratio 50%). The adhesive coating range (width of the cleaning surface) was set to 150 mm, and a 5 mm range from both ends of the width of the substrate S1 was used as a dry edge without adhesive coating. The amount of adhesive applied is about 15 to 25 g per 1 m2 of the area of base material S1 in the above coating range, so that the adhesive force of the cleaning surface (adhesive surface) to SUS is within the range of 0.1 to 1.0 N/25 mm. Adjusted as much as possible. In this way, the cleaning sheet according to Example 1 was produced.

<Example 2>

A PE sheet with a thickness of 20 μm is laminated on the back of nonwoven fabric F2 (“Oikos AP2050” manufactured by Nisshinbo Textiles, cotton nonwoven fabric manufactured by the spunlace method, basis weight 50 g/m2, water absorbent), and further on the surface of the PE sheet. A base material S2 with a width of 160 mm was prepared, on which a release treatment using a silicone-based release treatment agent was performed. A cleaning sheet according to this example was produced in the same manner as in Example 1, except that base material S2 was used instead of base material S1.

<Example 3>

A PE sheet with a thickness of 20 μm is laminated on the back of nonwoven fabric F3 (“#404WJ” manufactured by Futamura Chemical, rayon nonwoven fabric manufactured by wet staple fiber spunbond method, basis weight 40 g/m2, water absorbent), and further processed as above. A base material S3 with a width of 160 mm was prepared, on which the surface of the PE sheet was subjected to a peeling treatment using a silicone-based peeling agent. A cleaning sheet according to this example was produced in the same manner as in Example 1, except that base material S3 was used instead of base material S1.

<Examples 4, 5>

Cleaning sheets according to Examples 4 and 5 were produced in the same manner as Examples 1 and 3, respectively, except that the adhesive coating pattern was changed to a dot shape with a diameter of about 3 mm (lattice dot arrangement, adhesive area ratio of 60%).

<Example 6>

PET film (thickness 10 ㎛) and PE sheet (thickness 20 ㎛) are laminated in this order on the back of nonwoven fabric F6 (polypropylene (PP) nonwoven fabric "SP-1040E" manufactured by Maeda Kosen, basis weight 40 g/m2, non-absorbent). A long base material S6 with a width of 160 mm was prepared, on which the surface of the PE sheet was subjected to a peeling treatment using a silicone-based peeling agent. A cleaning sheet according to this example was produced in the same manner as in Example 1, except that base material S6 was used instead of base material S1.

<Examples 7 to 9>

As the cleaning sheets for Examples 7 to 9, the substrates S1 to S3 used in the production of the cleaning sheets for Examples 1 to 3 were used as is (i.e., without applying an adhesive to the nonwoven surface of the substrate).

<Example 10>

As the cleaning sheet according to this example, a PE sheet with a thickness of 20 μm is laminated on the back of nonwoven fabric F10 (PP nonwoven fabric “Ertus PO3040” manufactured by Asahi Kasei, basis weight 40 g/m2, non-absorbent), and the PE sheet surface is The elongated substrate S10 with a width of 160 mm, which had been subjected to a release treatment with a silicone-based release treatment agent, was used as is (i.e., without applying an adhesive to the nonwoven surface of the substrate).

<Production of cleaning roll>

A cleaning roll for each example was produced by winding the cleaning sheet for each example about 50 times around a cylindrical cardboard winding core with an outer diameter of 38 mm, with the nonwoven fabric side of the base material as the outside.

<Evaluation>

1. Absorption measurement

The cleaning sheet was taken out from the cleaning roll for each example, and three square test pieces with a side of 10 cm were taken. Measure the weight of the test piece (weight before absorption), immerse the test piece in water for 1 minute with the nonwoven fabric side of the substrate facing downward, take the test piece out into the water, hang it in the air for at least 1 minute, and drop the water. , its weight (weight after absorption) was measured. For each test piece, the difference between the weight after absorption and the weight before absorption was calculated, and the average value of the three test pieces is shown in Table 1 as the water absorption amount of the cleaning sheet [g/dm2].

2. Cleaning performance

[Water removal performance]

Set the surface of a non-waxed flooring material (manufactured by Aidaisangyo Co., Ltd., “DXRD-1451UR”; rectangular shape with a width of 30 cm and a length of 90 cm; the same applies hereinafter) as the surface to be cleaned, and spray 5 drops of water on the surface to be cleaned. Sprayed again. The amount of spray per time was about 0.5 g, and water colored red was used to make it easier to visually determine the degree of water removal. After that, the cleaning roll for each example is installed on the rotating part 52 of the jig 50 of the schematic shape shown in FIGS. 3 and 4, and the right half of the surface to be cleaned is reciprocated once, and then the left half is reciprocated once. Thus, the water removal performance was evaluated at the following three levels. The results are shown in Table 1.

E (Excellent): Water could almost be removed (has excellent water removal performance).

G (Good): Although some remained, most of the water could be removed (possesses good water removal performance).

P(Poor): Water could not be removed (water removal performance was insufficient).

[Hair removal performance (no water)]

After spreading 10 hairs of about 5 cm in length on the surface to be cleaned in a dry state, the cleaning roll for each example is installed on the rotating part 52 of the jig 50 of the schematic shape shown in FIGS. 3 and 4. Then, the right half of the surface to be cleaned was made one round trip, and then the left half was made one round trip. This test was performed 10 times, and the percentage of the total number of hairs removed relative to the total number of hairs used (100) is shown in Table 1. The larger the number, the higher the removal performance. The evaluation result of 100% indicates that all 100 hairs were able to be removed.

[Hair removal performance (with water)]

On the surface to be cleaned in a dry state, 10 hairs of about 5 cm in length were sprayed, and water was sprayed 5 times with a sprayer (the amount of spray per time was about 0.5 g). After that, the cleaning roll for each example is installed on the rotating part 52 of the jig 50 of the schematic shape shown in FIGS. 3 and 4, and the right half of the surface to be cleaned is reciprocated once, and then the left half is reciprocated once. I ordered it. This test was performed 10 times, and the percentage of the total number of hairs removed relative to the total number of hairs used (100) is shown in Table 1. The larger the number, the higher the removal performance. The evaluation result of 100% indicates that all 100 hairs were able to be removed.

3. Interlaminar strength

The cleaning sheet was taken out from the cleaning roll for each example, cut into strips with a width of 25 mm, and test pieces were produced. At this time, the direction of the long side of the test piece was made to match the long direction of the cleaning sheet. In preparation for measurement, the laminate layer (waterproof layer) was peeled from the nonwoven fabric by hand at one end of the long side direction of the test piece. Next, using a tensile tester, the nonwoven fabric side and the laminate layer side of the peeled portion were clamped together and a T-shaped peel test was performed under the condition of a tensile speed of 300 mm/min to measure the interlayer strength. The results are shown in Table 1.

In addition, in the cleaning sheets of Examples 2, 4, and 8, the laminate layer could not be peeled off by hand from the nonwoven fabric at one end of the long side of the test piece in preparation for measurement, so the column indicating interlayer strength was marked as “unable to measure.” It was described. These cleaning sheets are thought to have sufficiently high interlayer strength for practical use.

In addition, after the above-mentioned water removal test was performed on the cleaning rolls of Examples 1, 4, and 7 using the same base material S1, the cleaning sheet constituting the outermost periphery of the cleaning roll (i.e., the cleaning sheet absorbed by the above water removal test sheet), similarly, the interlayer strength of the nonwoven fabric and the laminate layer was briefly evaluated by hand peeling, and it was found that compared to the cleaning sheets of Examples 1 and 4, the interlayer strength of the cleaning sheet of Example 7 tended to decrease significantly due to water absorption. It has been done. This indicates that the adhesive partially coated on the nonwoven fabric contributes to suppressing the decrease in interlayer strength due to water absorption.

4. Tear strength

The cleaning sheet was taken out from the cleaning roll for each example, cut into strips with a width of 50 mm, and test pieces were produced. At this time, the direction of the long side of the test piece was aligned with the long direction of the cleaning sheet. A cut was made in the test piece along the center of the width of the test piece from one end in the longitudinal direction to the middle. Using a tensile tester, the tear strength of the cleaning sheet was measured by holding the right and left longitudinal ends of the incision with a chuck and pulling in the T-shaped direction at a tensile speed of 300 mm/min. The results are shown in Table 1.

5. Outer peripheral surface (adhesive side) renewal workability

After evaluating the hair removal performance (no water) by the above-mentioned method, the cleaning roll with hair attached was passed over the outer peripheral end of the cleaning sheet, and vertical cracking of the cleaning sheet due to the hair attached was observed. It was evaluated whether or not it occurred. The test was performed 10 times, and the renewal workability was evaluated at the following two levels based on the number of times vertical cracks occurred.

G (good): Number of vertical cracks occurring 0 or 1 time (good renewal workability).

A (acceptable): The number of times vertical cracks occur is 2 to 4 (has practical renewal workability).

As shown in Table 1, the cleaning sheets of Examples 1 to 5, which are composed of an adhesive partially disposed on an absorbent nonwoven fabric and have an absorption amount of 0.5 g/dm2 or more, have good water removal properties and can be used on the surface to be cleaned dry. Not only hair but also hair on the water-wet surface to be cleaned could be successfully removed. The cleaning sheets of Examples 1, 2, and 4 had greater tear strength than the cleaning sheets of Examples 3 and 5, and showed better adhesive surface renewal workability in the shape of the cleaning roll.

On the other hand, in the cleaning sheet of Example 6, in which the adhesive was partially disposed on a non-absorbent nonwoven fabric and the water absorption amount was small, water could not be removed. In the cleaning sheets of Examples 7 to 10 without adhesive, hair could not be removed.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above.

1: Cleaning roll
10: Cleaning sheet
10A: side 1
10B: Side 2
11: Cleaning side
12, 13: Adhesive non-placement area
14: cutting part
16: Winding outer peripheral end (turning part)
18: lead tape
20: Description
22: absorption layer
24: waterproof layer
31: Adhesive (first region)
32: Absorption layer exposed portion (second region)
40: winding core
50: Jig
52: Rotating member
54: Absence of grip
56: Cleaning target surface
100: Cleaner
W1: Width of first area
W2: Width of the second region

Claims (8)

A cleaning sheet having a first side and a second side,
A substrate having an absorbent layer at least on the front surface, and an adhesive partially disposed on the absorbent layer,
The first surface includes a cleaning surface having a first area where the adhesive is exposed and a second area where the absorbent layer is exposed,
A cleaning sheet with an absorption amount of 0.5 g/d㎡ or more. The cleaning sheet according to claim 1, wherein the cleaning surface is configured as an adhesive sheet with an adhesive surface. The cleaning sheet according to claim 1 or 2, wherein the substrate further includes a waterproof layer disposed on a back side of the absorbent layer. The cleaning sheet according to claim 3, wherein the interlayer strength of the waterproof layer and the absorbent layer is 0.5 N/25 mm or more. The cleaning sheet according to any one of claims 1 to 4, wherein the cleaning sheet has a tear strength of 1.0 N or more. The cleaning sheet according to any one of claims 1 to 5, wherein the cleaning sheet has a cut portion extending in a direction intersecting the long side direction of the cleaning sheet. The cleaning sheet according to any one of claims 1 to 6, wherein the cleaning sheet is wound with the cleaning surface facing outward, thereby forming a cleaning roll. a cleaning roll in which the cleaning sheet according to any one of claims 1 to 6 is wound with the cleaning surface facing outward;
A jig that rotatably supports the cleaning roll.
Equipped with a cleaner.