Cleaning roller

Abstract

To provide a cleaning roller that is less likely to generate foreign matter and less likely to cause uneven cleaning when cleaning using a liquid.SOLUTION: The present technology provides a cleaning roller including a core body and a porous body spirally wound around the outer peripheral surface of the core body, and the contact area between the core body and the porous body is larger than the exposed area of the core body, and the thickness of the porous body is 4 mm or more.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present technology relates to a cleaning roller.

Background Art

[0002] Conventionally, for example, in the manufacturing processes of aluminum hard disks, glass disks, wafers, photomasks, liquid crystal glass substrates, etc., in order to finish the surface into an extremely precise surface, high-precision polishing using various abrasive grains such as ceria is performed. In this polishing process, abrasive grains and abrasives adhere to the surface of the object to be polished. Therefore, it is necessary to sufficiently clean the abrasive grains and abrasives so as not to damage the surface of the object to be polished. To perform this cleaning, various cleaning rollers are used.

[0003] For example, Patent Document 1 discloses "a roll brush that cleans the main surface of a substrate by contacting and rotating it on the main surface of the substrate, wherein a strip-shaped brush formed by bundling a plurality of brush hairs is spirally wound around a columnar roll member that forms the core of the roll brush on the outer peripheral surface of the roll member, with a gap provided between adjacent strip-shaped brushes."

[0004] Further, Patent Document 2 discloses "a brush roller that is composed of a porous material having elasticity in a wet state, has a substantially cylindrical roll body and a plurality of protrusions integrally formed on the outer peripheral surface of the roll body, and the protrusions rotate in contact with the surface to be cleaned by rotating around the axis of the roll body to clean the surface to be cleaned, wherein the plurality of protrusions are composed of a staggered arrangement protrusion group arranged in a staggered pattern at both ends in the longitudinal direction along the axis on the outer peripheral surface of the roll body, and a spiral arrangement protrusion group arranged in a spiral shape with a lower density than the staggered arrangement protrusion group in the middle part between the both ends."

[0005] Further, Patent Document 3 discloses "a cleaning member for an image forming apparatus having a core body and an elastic layer spirally arranged on the outer peripheral surface of the core body, which satisfies a predetermined conditional expression."

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, when using a roll brush formed by bundling a plurality of brush hairs as in Patent Document 1 for example, there is a risk of generating foreign matters due to the shedding or breakage of the brush hairs. Also, for example, in Patent Document 2, a brush roller composed of a polyvinyl acetal-based porous material has been proposed. The polyvinyl acetal-based porous material swells (volume change) by absorbing water. Therefore, variations are likely to occur in contact with the object to be cleaned, which may cause uneven cleaning. Further, for example, Patent Document 3 does not disclose cleaning using a liquid. Therefore, there is a risk that this cleaning member cannot be used in cleaning using a liquid.

[0008] Therefore, the main object of the present technology is to provide a cleaning roller that is less likely to generate foreign matters and less likely to cause uneven cleaning in cleaning using a liquid.

Means for Solving the Problems

[0009] In the present technology, a core body, and a porous body spirally wound around the outer peripheral surface of the core body, are provided, the contact area between the core body and the porous body is larger than the exposed area of the core body, a cleaning roller is provided in which the thickness of the porous body is 4 mm or more. The ratio A2 / (A1 + A2) of the contact area A2 to the sum of the exposed area A1 and the contact area A2 may be greater than 70% and less than 92%. The porous body may be a porous body obtained by extracting and removing a pore-forming material from a resin composition. The spiral pitch of the porous body at the central portion in the axial direction of the core may be larger than the spiral pitch of the porous body at both axial ends of the core. Also, in this technology a core body a cylindrical portion covering the core body and a porous body having a ridge portion that spirally protrudes from the outer peripheral surface of the cylindrical portion and is continuous in the axial direction of the core body, are provided to provide a cleaning roller. According to this technology, in cleaning using a liquid, it is possible to provide a cleaning roller in which foreign matters are less likely to occur and cleaning unevenness is less likely to occur. Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0011] Hereinafter, preferred embodiments for implementing the present technology will be described with reference to the drawings. It should be noted that the embodiments described below show an example of a typical embodiment of the present technology, and the scope of the present technology is not limited thereby. Further, the present technology can combine any of the following examples and their modified examples.

[0012] In the following description of the embodiments, the configuration may be described using terms with "substantially" such as substantially parallel and substantially orthogonal. For example, substantially parallel not only means completely parallel, but also means substantially parallel, that is, it includes a state deviated from the completely parallel state by, for example, about several percent. The same applies to other terms with "substantially". Also, each figure is a schematic diagram and is not necessarily drawn precisely. The scale of the drawings is emphasized for easy understanding of the technical features. Therefore, it should be noted that the scale of the drawings is not necessarily the same as that of the actual device.

[0013] Unless otherwise specified, in the drawings, "up" means the upward direction or upper side in the figure, "down" means the downward direction or lower side in the figure, "left" means the leftward direction or left side in the figure, and "right" means the rightward direction or right side in the figure. Also, for the drawings, the same or equivalent elements or members are denoted by the same reference numerals, and redundant descriptions are omitted.

[0014] The description will be made in the following order. 1. First Embodiment of the Present Technology (Example 1 of Cleaning Roller) (1) Overview (2) Core 1 (3) Porous Body 2 (4) Resin Composition (5) Pore-Forming Material (6) Water-Soluble Polymer Compound 2. Second Embodiment of the Present Technology (Example 2 of Cleaning Roller) 3. Third Embodiment of the Present Technology (Example 3 of Cleaning Roller) 4. Fourth Embodiment of the Present Technology (Example 4 of Cleaning Roller)

[0015] [1. First Embodiment of the Present Technology (Example 1 of Cleaning Roller)] [(1) Overview] The present technology provides a cleaning roller including a core body and a porous body spirally wound around the outer peripheral surface of the core body, wherein the contact area between the core body and the porous body is larger than the exposed area of the core body, and the thickness of the porous body is 4 mm or more.

[0016] A configuration example of the cleaning roller according to an embodiment of the present technology will be described with reference to FIG. 1. FIG. 1 is a schematic perspective view showing a configuration example of a cleaning roller 100 according to an embodiment of the present technology.

[0017] As shown in FIG. 1, the cleaning roller 100 includes a core body 1 and a porous body 2. The porous body 2 is spirally wound around the outer peripheral surface of the core body 1. Specifically, the porous body 2 is spirally wound around the core body 1 from one end to the other end at a predetermined interval (pitch) with the core body 1 as the spiral axis. For example, a strip-shaped porous body 2 is attached to the core body 1 by a double-sided tape, an adhesive, or the like, so that a continuous porous body 2 without gaps in the axial direction of the core body 1 is spirally wound around the outer peripheral surface of the core body 1. When the cleaning roller 100 is rotated due to the spiral winding of the porous body 2, liquids or the like adhering to the surface of the object to be cleaned move along the spiral portion of the porous body 2 to the end of the cleaning roller 100.

[0018] The cleaning roller according to the present technology can be mounted on a cleaning device that uses a liquid to clean, for example, an aluminum hard disk, a glass disk, a wafer, a photomask, a liquid crystal glass substrate, or the like.

[0019] [(2) Core Body 1] The material of the core body 1 is not particularly limited. The material of the core body 1 may be a hard material such as metal or plastic.

[0020] Since the porous body 2 is spirally wound around the outer peripheral surface of the core body 1, a part of the core body 1 is in contact with the porous body 2, and the remaining part of the core body 1 is exposed. At this time, it is preferable that the contact area between the core body 1 and the porous body 2 is larger than the exposed area of the core body 1. With such a configuration, uneven cleaning is less likely to occur, and in cleaning using a liquid, the porous body 2 can sufficiently absorb the liquid adhering to the surface of the object to be cleaned.

[0021] The preferable ratios of the contact area, the exposed area, and the total value of the contact area (the surface area of the core body 1) will be described. Let the exposed area of the core body 1 be A1, and the contact area between the core body 1 and the porous body 2 be A2.

[0022] The contact area A2 can be calculated by multiplying the width (length in the short side direction) W of the porous body 2 by the length in the longitudinal direction of the porous body 2.

[0023] When the diameter of the core body 1 is Φ and the axial length of the cleaning roller 100 (the length of the range where the porous body 2 is wound) is L, the exposed area A1 of the core body 1 can be calculated using the following formula (1).

[0024] A1 = Φ * π * L - A2 ···(1)

[0025] At this time, it is preferable that the ratio A2 / (A1 + A2) of the contact area A2, the exposed area A1, and the total value of the contact area A2 (the surface area of the core body 1) is larger than 70% and smaller than 92%. With such a configuration, uneven cleaning is less likely to occur, and in cleaning using a liquid, the porous body 2 can sufficiently absorb the liquid adhering to the surface of the object to be cleaned.

[0026] [(3) Porous body 2] In order to enhance water absorption, it is preferable that the lower limit value of the thickness T of the porous body 2 is 4 mm or more. More preferably, it is 5 mm or more, and even more preferably, it is 6 mm or more.

[0027] Further, the upper limit value of the thickness T of the porous body 2 is preferably 10 mm or less. More preferably, it is preferably 9 mm or less, and still more preferably, it is preferably 8 mm or less.

[0028] Furthermore, as shown in this figure, it is preferable that the spiral pitch of the porous body 2 at the central portion in the axial direction of the core body 1 is larger than the spiral pitch of the porous body 2 at both axial ends of the core body 1. As a result, at both axial ends of the core body 1, the porous body 2 exists more densely than at the central portion in the axial direction. Also, at the central portion in the axial direction of the core body 1, the porous body 2 exists more coarsely than at both axial ends.

[0029] For example, when cleaning a circular substrate, the cleaning roller 100 is disposed on the substrate along the radial direction passing through the center of the surface to be cleaned of the substrate. Then, by rotating the cleaning roller 100 while rotating the substrate, the tip of the porous body 2 comes into contact with the surface to be cleaned of the substrate, and the cleaning roller 100 cleans the surface to be cleaned. At this time, the liquid used for cleaning moves from the vicinity of the central portion in the axial direction to the vicinity of both axial ends by centrifugal force. The centrifugal force acting near both axial ends is stronger than the centrifugal force acting near the central portion in the axial direction. Therefore, regarding the moving speed of the liquid used for cleaning, the moving speed near the central portion in the axial direction is slow, and the moving speed near both axial ends in the axial direction is fast. As a result, there is a possibility that the vicinity of the central portion in the axial direction cannot be sufficiently cleaned compared to the vicinity of both axial ends in the axial direction.

[0030] In the present embodiment, the porous body 2 is spirally wound around the outer peripheral surface of the core body 1. Therefore, in the liquid adhering to the surface to be cleaned of the substrate (the surface of the object to be cleaned), a flow occurs along the spiral portion of the porous body 2 from the vicinity of the central portion in the axial direction toward the vicinity of both axial ends in the axial direction. In the present embodiment, a single porous body 2 is spirally wound around the outer peripheral surface of the core body 1. Therefore, the liquid adhering to the surface is discharged from the vicinity of the central portion in the axial direction to the vicinity of both axial ends in the axial direction by the above flow without staying and dispersing.

[0031] Furthermore, at both axial ends of the core body 1, the porous body 2 is more densely present than at the axial center. Therefore, the liquid movement speed in the vicinity of both axial ends can be made faster, and the water absorption amount of the liquid in the vicinity of both axial ends can be made larger. As a result, the liquid discharged from the vicinity of the axial center to the vicinity of both axial ends and the liquid adhering to the vicinity of both axial ends can be sufficiently discharged. As a result, the surface to be cleaned can be uniformly cleaned.

[0032] Also, due to such a configuration, when the cleaning roller 100 is brought into contact with the object to be cleaned, the contact pressure at the axial center of the cleaning roller 100 is smaller than that at both axial ends. As a result, it is possible to clean the surface of the object to be cleaned without damaging it.

[0033] The upper limit value of the spiral interval of the porous body 2 at both axial ends of the core body 1 is preferably, for example, 90% or less with respect to the spiral interval of the porous body 2 at the axial center of the core body 1. More preferably, it is preferably 80% or less, and still more preferably 70% or less.

[0034] Also, the lower limit value of the spiral interval of the porous body 2 at both axial ends of the core body 1 is preferably, for example, 10% or more with respect to the spiral interval of the porous body 2 at the axial center of the core body 1. More preferably, it is preferably 20% or more, and still more preferably 30% or more.

[0035] The porous body 2 according to the present technology is preferably a porous body obtained by extracting and removing a pore-forming material from a resin composition. The manufacturing method of the porous body 2 is not particularly limited. For example, it can be manufactured by extracting and removing the pore-forming material from a molded body of a mixture obtained by mixing a resin composition, a pore-forming material, and, if necessary, other components in a heated state. Examples of other components include lubricants such as water-soluble polymer compounds, fillers, colorants, flame retardants, plasticizers, antistatic agents, antioxidants, ultraviolet absorbers, and antifungal agents.

[0036] Specifically, first, a resin composition as a raw material, one or more pore-forming materials, and, if necessary, other components are mixed and kneaded at a predetermined mixing ratio using a predetermined device to obtain a mixture. Next, the obtained mixture is formed into a molded body having a predetermined shape using an extruder or the like. Thereby, the obtained molded body can be immersed in water or the like at a predetermined temperature to extract and remove the pore-forming material, thereby obtaining a porous body having a large number of fine bubbles. For example, the porous body according to the present technology 2 can be obtained by cutting the obtained porous body into strip shapes.

[0037] In addition, for the mixing and kneading of the resin composition, the pore-forming material, and, if necessary, other components, kneading devices such as a labo plastomill, a single-screw or twin-screw extruder, a kneader, a pressure kneader, a conical kneader, a Banbury mixer, a Henschel mixer, and a rotor mixer can be used. For this kneading, no special device is required, and the kneading speed and the like are not particularly limited. The temperature during kneading is appropriately set according to the melting point of the resin or the like used. The kneading time depends on the physical properties of the mixture, but it is sufficient that the mixture is sufficiently mixed and kneaded. The kneaded raw material can be formed into a desired shape by extrusion, injection, pressing, rolling, blowing, or the like.

[0038] The molded body formed into a desired shape is extracted and removed by immersing the pore-forming material in water or the like as a solvent for a predetermined time (for example, 24 to 48 hours, etc., depending on the shape and thickness of the molded body). When a water-soluble substance such as a water-soluble polymer compound is used, the water-soluble substance is also extracted and removed. The immersion at this time may be any method, but extraction and removal by immersion in which the entire mixture is brought into contact with water or the like are preferred. The temperature of the water or the like used is not particularly limited as long as it is lower than the melting point of the resin used, but warm water at 15 to 60°C or the like may be used for efficient removal of the water-soluble substance.

[0039] The lower limit of the Asker C hardness of the porous body used in the present technology is preferably 3 or more, more preferably 4 or more, and even more preferably 5 or more.

[0040] The upper limit of the Asker C hardness of the porous body used in this technology is preferably 40 or less, more preferably 35 or less, and even more preferably 30 or less.

[0041] By setting the Asker C hardness of the porous body to such a value, it is possible to wash the object to be washed without damaging it.

[0042] In this technology, the Asker C hardness can be, for example, the value measured by the Asker rubber hardness tester type C (manufactured by Kobunshi Keiki Co., Ltd.) adopted in JIS K 7312.

[0043] [(4) Resin composition] As the resin composition that can be used for the porous body used in this technology, thermoplastic resins or thermosetting resins can be used. Among these, from the viewpoint of recyclability, it is particularly preferable to use thermoplastic resins. Examples of thermoplastic resins include polyolefin resins, thermoplastic elastomers (TPE), thermoplastic polyurethane elastomers (TPU), polyamides, polyimides, and polyacetals, etc. These can also be used alone or in combination of two or more.

[0044] In this technology, among these, it is particularly preferable to use polyolefin resins. A polyolefin resin is a resin mainly composed of olefin component units. A resin mainly composed of olefin component units means a resin containing 50% by mass or more of olefin component units.

[0045] Examples of the polyolefin resin that can be used in this technology include polyethylene, polypropylene, polybutene, polypentene, and copolymers of olefin-based monomers and monomers copolymerizable with the olefin-based monomers, etc. These can also be used alone or in combination of two or more.

[0046] As for polyethylene, homopolymers of ethylene such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and very low-density polyethylene (VLDPE); ethylene-propylene random copolymers, ethylene-propylene block copolymers, ethylene-butene block copolymers, ethylene-butene random copolymers, ethylene-vinyl acetate copolymers, and ethylene-methyl methacrylate copolymers, etc. can be mentioned.

[0047] As for polypropylene resins, homopolymers of propylene such as isotactic polypropylene, syndiotactic polypropylene, and atactic polypropylene; propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene-butene random copolymers, propylene-butene block copolymers, propylene-ethylene-butene terpolymers, propylene-acrylic acid copolymers, and propylene-maleic anhydride copolymers, etc. can be mentioned.

[0048] In this technology, among these, any one or more selected from the group consisting of α-olefin copolymers, polyethylene, and ethylene-octene copolymers are preferred.

[0049] Also, as the resin composition that can be used in this technology, for example, fluororesins can also be used. Fluororesins have chemical resistance. Therefore, using fluororesins is useful in cleaning with chemicals.

[0050] Examples of fluororesins include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), ethylene-tetrafluoropropylene copolymer (ETEF), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), etc. The fluororesin may be a copolymer of various fluorinated monomers, and examples of the fluorinated monomers may also include copolymers selected from tetrafluoroethylene, hexafluoropropylene, perfluorovinyl ether, vinylidene fluoride, and perfluoro(vinyl)ether.

[0051] [(5) Pore-forming material] As the pore-forming material that can be used in the production of the porous body used in this technology, it is preferably soluble in water, alcohol, or an alcohol aqueous solution (preferably water), and is also a stable substance when the resin composition melts. Specifically, for example, inorganic substances such as NaCl, KCl, CaCl, NH4Cl, NaNO3, and NaNO2; organic substances such as sodium salts of TME (trimethylolethane), trimethylolpropane, trimethylolbutane, sucrose, soluble starch, sorbitol, glycine, and various organic acids (for example, malic acid, citric acid, glutamic acid, succinic acid, succinic acid, etc.) can be mentioned, and these can also be used alone or in combination of two or more.

[0052] In this technology, among these, it is particularly preferable to use inorganic substances, and among the inorganic substances, it is particularly preferable to use NaCl.

[0053] The lower limit of the average particle diameter of the pore-forming material is preferably 10 μm or more, more preferably 15 μm or more, and even more preferably 20 μm or more.

[0054] The upper limit of the average particle diameter of the pore-forming material is preferably 300 μm or less, more preferably 250 μm, and even more preferably 200 μm or less.

[0055] By setting the average particle diameter of the pore-forming material to 10 μm or more, the pore size of the porous body can be controlled to a certain level or more, and a porous body excellent in formability, abrasion resistance, and chemical resistance can be provided. On the other hand, by setting the average particle diameter of the pore-forming material to 300 μm or less, the pore size of the porous body can be controlled to a certain level or less. Here, the "average particle diameter of the pore-forming material" refers to the average particle diameter in the mixed state when two or more pore-forming materials having a single peak are mixed.

[0056] In the present technology, the average particle diameter is the particle diameter (D-50) at which the cumulative frequency is 50% in the particle size distribution measured by the laser diffraction method.

[0057] [(6) Water-soluble polymer compound] In the production of the porous body used in the present technology, a water-soluble polymer compound that acts as a lubricant may be used. Specifically, for example, polyethylene glycol derivatives such as polyethylene glycol, polyethylene oxide, polyethylene glycol diacrylate, polyethylene glycol dioleate, and polyethylene glycol diacetate can be mentioned, and these can be used alone or in combination of two or more.

[0058] In the present technology, among these, it is particularly preferable to use polyethylene glycol. This is because polyethylene glycol has a high melt flow and high water solubility. When the molding is performed by an extrusion molding method, the lower limit of the molecular weight of polyethylene glycol is preferably 2,000 or more, more preferably 5,000 or more, and even more preferably 15,000 or more. The upper limit of the molecular weight of polyethylene glycol is preferably 30,000 or less, more preferably 25,000 or less, and even more preferably 25,000 or less.

[0059] In the production of the porous body according to the present technology, the mixing ratio of the resin composition, the pore-forming material, and the water-soluble polymer compound is preferably 10:90 to 40:60 in vol%, more preferably 12:88 to 30:70, still more preferably 15:85 to 20:80, and particularly preferably 16:84 to 18:82. When the resin composition is less than 10 vol%, the molded body itself will separate during the extraction and removal of the water-soluble substance. On the other hand, when the pore-forming material and the water-soluble polymer compound are 60 vol% or less, the addition amount is small and the extraction and removal of the water-soluble substance cannot be completed, and a porous structure cannot be obtained.

[0060] The above-described content regarding the cleaning roller according to the first embodiment of the present technology can be applied to other embodiments of the present technology as long as there is no particular technical contradiction.

[0061] [2. Second Embodiment of the Present Technology (Example 2 of Cleaning Roller)] The cleaning roller 100 shown in FIG. 1 may have the core 1 and the porous body 2 integrally formed. That is, the present technology provides a cleaning roller including a core 1 and a porous body 2 spirally attached to the outer peripheral surface of the core 1, wherein the contact area between the core 1 and the porous body 2 is larger than the exposed area of the core 1, and the thickness T of the porous body 2 is 4 mm or more. By integrally forming the core 1 and the porous body 2, a double-sided tape or the like for attaching the porous body 2 to the core 1 becomes unnecessary.

[0062] A configuration example of a mold for manufacturing the cleaning roller 100 according to the present embodiment will be described with reference to FIG. 2. FIG. 2 is a schematic perspective view showing a configuration example of a mold 5 for manufacturing the cleaning roller 100 according to an embodiment of the present technology.

[0063] As shown in FIG. 2, this mold 5 is configured to include an upper mold 51 and a lower mold 52. A spiral groove 53 is formed inside the mold 5. For example, a mixture containing a raw material of the porous body 2 used in the present technology, such as a resin composition, and one or more pore-forming materials is poured into this groove 53, and then the pore-forming materials are extracted and removed, whereby the porous body 2 can be attached to the outer peripheral surface of the core body 1.

[0064] The above-described content regarding the cleaning roller according to the second embodiment of the present technology can be applied to other embodiments of the present technology as long as there is no particular technical contradiction.

[0065] [3. Third Embodiment of the Present Technology (Example 3 of Cleaning Roller)] The present technology provides a cleaning roller including a core body, a cylindrical portion covering the core body, and a porous body having a ridge portion that spirally protrudes from the outer peripheral surface of the cylindrical portion and is continuous in the axial direction of the core body.

[0066] A configuration example of the cleaning roller according to the present embodiment will be described with reference to FIG. 3. FIG. 3 is a schematic perspective view showing a configuration example of a cleaning roller 101 according to an embodiment of the present technology.

[0067] As shown in FIG. 3, the cleaning roller 101 includes a core body 1, a cylindrical portion 3 covering the core body 1, and a porous body 2. The porous body 2 has a ridge portion 4 that spirally protrudes from the outer peripheral surface of the cylindrical portion 3 and is continuous in the axial direction of the core body 1. The ridge portion 4 is spirally arranged on the outer peripheral surface of the cylindrical portion 3 and is continuous.

[0068] The material of the cylindrical portion 3 is not particularly limited. For example, the cylindrical portion 3 may contain the same material as the porous body 2. The hardness of the cylindrical portion 3 is preferably lower than the hardness of the core body 1 and higher than the hardness of the porous body 2. Thereby, the cylindrical portion 3 absorbs pressure, and uneven cleaning is less likely to occur.

[0069] It is preferable that the contact area A4 between the cylindrical portion 3 and the porous body 2 is larger than the exposed area A3 of the cylindrical portion 3. In particular, it is preferable that the ratio A4 / (A3 + A4) of the contact area A4 to the sum of the exposed area A3 and the contact area A4 (the surface area of the cylindrical portion 3) is greater than 70% and less than 92%. With such a configuration, uneven cleaning is less likely to occur, and in cleaning using a liquid, the porous body 2 can sufficiently absorb the liquid adhering to the surface of the object to be cleaned.

[0070] Note that the cylindrical portion 3 and the porous body 2 may be integrally formed, or the core body 1, the cylindrical portion 3, and the porous body 2 may be integrally formed.

[0071] The above description of the cleaning roller according to the third embodiment of the present technology can be applied to other embodiments of the present technology as long as there is no particular technical contradiction.

[0072] [4. Fourth Embodiment of the Present Technology (Example 4 of Cleaning Roller)] A configuration example of a cleaning roller 102 according to an embodiment of the present technology will be described with reference to FIG. 4. FIG. 4 is a schematic perspective view showing a configuration example of a cleaning roller 102 according to an embodiment of the present technology.

[0073] As shown in FIG. 4, the porous body 2 is arranged spirally on the outer peripheral surface of the core body 1. The advancing direction of this spiral changes to the opposite direction in the middle of the spiral. In this configuration example, as advancing from the left side to the right side, the advancing direction of the spiral formed by the porous body 2 changes from clockwise to counterclockwise.

[0074] Note that in this configuration example, the advancing direction of the spiral changes near the central portion in the axial direction of the core body 1, but the position where the advancing direction of the spiral changes is not particularly limited.

[0075] The above description of the cleaning roller according to the fourth embodiment of the present technology can be applied to other embodiments of the present technology as long as there is no particular technical contradiction.

[0076] Note that the embodiments according to the present technology are not limited to the above-described respective embodiments, and various modifications are possible without departing from the gist of the present technology. The specific numerical values, shapes, materials (including compositions), etc. described in each embodiment are examples and are not limited thereto.

[0077] Also, the present technology can also have the following configuration. [1] A core body, A porous body spirally wound around the outer peripheral surface of the core body, and The contact area between the core body and the porous body is larger than the exposed area of the core body, A cleaning roller, wherein the thickness of the porous body is 4 mm or more. [2] The ratio A2 / (A1 + A2) of the contact area A2 to the sum of the exposed area A1 and the contact area A2 is greater than 70% and less than 92%, The cleaning roller according to [1]. [3] The porous body is a porous body obtained by extracting and removing a pore-forming material from a resin composition. The cleaning roller according to [1] or [2]. [4] The spiral pitch of the porous body at the central portion in the axial direction of the core body is larger than the spiral pitch of the porous body at both axial ends of the core body. The cleaning roller according to any one of [1] to [3]. [5] A core body, A cylindrical portion covering the core body, A cleaning roller comprising a porous body having a ridge portion that spirally protrudes from the outer peripheral surface of the cylindrical portion and is continuous in the axial direction of the core body.

Example

[0078] Hereinafter, the present technology will be described in more detail based on examples.

[0079] Note that the embodiments described below show an example of a typical embodiment of the present technology, and thus the scope of the present technology should not be construed narrowly.

[0080] Examples implemented using the present technology and comparative examples thereof are shown in Table 1.

[0081]

Table 1

[0082] As shown in Table 1, the diameter Φ of the core was set to 5 mm.

[0083] The thickness T of the porous body was set to 4 mm or more as shown in Examples 1 to 6. In the simulation, the water absorption amount could be increased in Examples 1 to 6 compared to the comparative example where the thickness T was 3 mm. Also, in Example 5 where the thickness T was 8 mm, which was larger, the water absorption amount was even more. In Example 6 where the thickness T was further increased to 10 mm, the water absorption amount was further increased.

[0084] The width W of the porous body was set to 5 mm.

[0085] The length L1 of the porous body in the longitudinal direction affects the contact area A2 between the core and the porous body. The length of the porous body can be appropriately set according to the required contact area.

[0086] The axial length L of the cleaning roller was set to 350 mm.

[0087] The exposed area A1 of the core was calculated using the above formula (1).

[0088] The contact area A2 between the core and the porous body was calculated by multiplying the width W of the porous body and the length L1 of the porous body.

[0089] The surface area of the core was calculated to be 55 cm by multiplying the diameter Φ of the core, π, and the axial length L of the cleaning roller. 2 and calculated.

[0090] Based on the exposed area A1 and the contact area A2, the ratio A2 / (A1 + A2) can be calculated. As shown in this table, it is preferable that this ratio is greater than 70% and less than 92%. In Examples 1 to 6, since this ratio is greater than 70% and less than 92%, in the simulation, the water absorption amount could be made larger than that of the Comparative Examples.

Explanation of Reference Signs

[0091] 1 Core 2 Porous Body 3 Cylindrical Portion 4 Rib Portion 100, 101, 102 Cleaning Rollers

Claims

1. a core body; a porous body spirally wound around an outer peripheral surface of the core body, and a contact area between the core body and the porous body is larger than an exposed area of the core body, and the cleaning roller, wherein a thickness of the porous body is 4 mm or more.

2. a ratio A2 / (A1 + A2) of the contact area A2 to a total value of the exposed area A1 and the contact area A2 is larger than 70% and smaller than 92%, and the cleaning roller according to Claim 1.

3. the porous body is a porous body obtained by extracting and removing a pore-forming material from a resin composition, and the cleaning roller according to Claim 1.

4. a spiral pitch of the porous body at an axially central portion of the core body is larger than a spiral pitch of the porous body at both axially end portions of the core body, and the cleaning roller according to Claim 1.

5. a core body; a cylindrical portion covering the core body; and the cleaning roller, comprising a porous body having a ridge portion that protrudes spirally from an outer peripheral surface of the cylindrical portion and is continuous in an axial direction of the core body.

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