JP5050471B2 - Winding device for rolls and electrically insulating sheets - Google Patents

Description

  The present invention relates to a roll and a winding device for an electrically insulating sheet.

  When a sheet roll body is produced by winding a sheet of plastic film or the like in a roll shape, it is important to wind the sheet without wrinkling defects such as wrinkles or charging defects due to static electricity. In general, when winding a sheet, the contact roll is pressed against the sheet roll body to wind up the sheet roll body in good winding form by removing air. At this time, as the contact pressure roll, it is necessary to eliminate air by following the minute unevenness of the sheet roll body caused by unevenness of the sheet thickness, etc., so that the core is made of rubber having a lower hardness than the metal roll. Rolled rubber rolls are often used. The contact pressure roll is also called a pressure roll or a nip roll.

  At this time, the contact pressure roll is required to have a low-friction rubber surface in order to suppress wrinkles and electrostatic charging of the wound sheet roll body.

  On the other hand, the surface of rubber is generally polished to finish, but for example, as shown in Patent Document 2, the surface of rubber is polished or subjected to surface treatment by ultraviolet irradiation, and the friction coefficient is small. It is known to use a rubber roll.

  However, since rubber materials generally have a soft surface, their characteristics change over time. For example, when used as a contact pressure roll for a long time, the surface treatment layer may be scraped off due to wear. Thus, there is a problem that the initial surface state may not be maintained. That is, the technique of Patent Document 2 may not be able to withstand long-time use.

  The coefficient of friction on the surface of the rubber roll decreases as the surface roughness increases. However, the surface of the rubber roll is repeatedly brought into contact with the film, so that the irregularities on the surface are worn and flattened. In particular, the larger the center line average roughness (Ra), which is an index of the roughness of the roll surface, is more likely to wear away. That is, if the surface roughness of the rubber roll is increased in order to keep the friction coefficient low, the wear is accelerated and the friction coefficient cannot be maintained for a long period. Therefore, a contact pressure roll having a relatively rough rubber surface and good durability has been demanded.

  Regarding the rubber hardness, soft rubber is applied to absorb the unevenness of the sheet roll body, follow the deformation of the sheet roll body, and average the pressure distribution to the sheet roll body. However, when the surface of the soft rubber roll is repeatedly contacted with the film, the irregularities on the surface are easily worn away and flattened. In particular, the smaller the rubber hardness that is an index of softness, the easier it is to wear out. That is, when soft rubber is used, wear is accelerated and the coefficient of friction cannot be maintained. Therefore, a rubber roll having a relatively small rubber hardness and good durability has been demanded.

  Furthermore, since the surface of the film has recently been required to have a smoother and flat surface, the surface of the rubber roll is relatively required to have a lower friction coefficient and a lower triboelectric charge amount. In particular, in the contact pressure roll that winds the film while pressing against the sheet roll body, the film surface and the rubber roll surface are in close contact with each other as compared with the case of transporting the film. There was a case that I could not finish. For this reason, generation of discharge traces due to frictional charging and local adhesion due to charging may occur, which may cause wrinkles on the sheet roll body.

  In such a situation, the present inventors have used an amorphous carbon-like film on the rubber surface, such as diamond-like carbon (hereinafter referred to as DLC) as a rubber roll that maintains a lower coefficient of friction even after long-term use. A technique for forming a thin film made of (abbreviated as a film) has been disclosed (Patent Document 1).

  However, in the rubber roll disclosed in Patent Document 1, the adhesion between the rubber surface and the DLC film is not sufficient, and when the roll surface is wiped with a cloth soaked with chemicals or water to clean the roll, the DLC film There was a problem that sometimes peeled off.

  Regarding the internal structure of the contact pressure roll used for the above purpose (particularly the structure corresponding to the “core” of the present invention), preferred examples are disclosed in Patent Document 3, Patent Document 4, and Patent Document 7. ing.

An example of a method for forming a “DLC film” in the present invention, which will be described later, is described in Patent Document 5, and an example of a method for forming a “layer consisting of a large number of small regions” is described in Patent Document 6.
JP 2004-251373 A Japanese Patent Laid-Open No. 2-81854 Japanese Examined Patent Publication No. 6-45410 Japanese Patent No. 2888139 Japanese Patent No. 3791060 JP 2002-121669 A Japanese Patent Laid-Open No. 11-47866

  The object of the present invention is to provide a surface property particularly suitable for the production of a sheet roll body in view of the above-mentioned problems of the prior art, and even if it is wiped and cleaned with a liquid, the amorphous carbon film is difficult to peel off, Moreover, it is an object of the present invention to provide a contact pressure roll that hardly changes over time even when used for a long time. Moreover, the objective of this invention is providing the manufacturing method of a good-quality sheet roll body using the winding apparatus which used this roll as a contact pressure roll.

In order to achieve the above object, according to the present invention, a layer of a material softer than the material forming the core is formed on the surface of the substantially cylindrical core, and a large number of small regions are independently formed on the outermost layer. A roll in which an amorphous carbon-like film layer is formed, and a hydrophobic layer having water repellency that repels water between the soft material layer and the amorphous carbon-like film layer mETHOD There is formed, a method of forming a hydrophobic layer having the water repellency is performed by bonding a layer having water repellency using an adhesive on the surface layer of the soft material layer or, the soft material The rubber layer is a rubber layer, and the rubber surface is immersed in the solution so that the number of carbon-carbon double bonds of the rubber molecules on the rubber surface is less than that of the rubber layer by immersing the solution in the rubber surface. A roll is provided that is a dipping method.
Moreover, according to the preferable form of this invention, the roll whose said solution is a solution containing an alkyl hypohalide is provided.

  Moreover, according to the preferable form of this invention, the static friction coefficient of the surface of the said roll is 0.1 or more and 0.3 or less, and the roll whose hardness is the range of 35-55 degree | times is provided.

  Moreover, according to the preferable form of this invention, the roll whose centerline average roughness of the surface of the said roll is 0.1 micrometer or more and 1.4 micrometers or less is provided.

  According to a preferred embodiment of the present invention, there is provided a roll, wherein the amorphous carbon-like film layer is a layer having diamond-like carbon having a thickness of 0.1 μm to 3 μm.

  Moreover, according to the preferable form of this invention, the static friction coefficient of the surface of the said hydrophobic layer is provided with 0.3-0.65.

  Moreover, according to another form of this invention, the winding apparatus of the electrically insulating sheet | seat provided with said roll as a contact pressure roll is provided.

  Moreover, according to another form of this invention, the manufacturing method of the sheet roll body which winds up a sheet | seat using said winding apparatus and turns into a sheet roll body is provided.

  Examples of the sheet in the present invention include webs such as plastic films, fabrics and paper. In particular, plastic films such as polyethylene terephthalate film, polyethylene naphthalate film, polypropylene film, polystyrene film, polycarbonate film, polyimide film, polyphenylene sulfide film, nylon film, aramid film, and polyethylene film have high insulation and suppress charging defects. From the aspect, it is also suitable as an object of the present invention.

  In the present invention, the “substantially cylindrical core” refers to a core material in which the inner shape on which the soft material layer is formed has a substantially cylindrical surface shape. The inside of the core material may be hollow or solid. Examples of cases where the interior is hollow include the examples described in Patent Documents 3 and 4. In particular, the example of Patent Document 4 uses FRP (fiber reinforced plastic) whose main material is carbon fiber as a reinforcing material, and has a configuration suitable as a contact pressure roll. Here, the “substantially cylindrical” refers to a cylindrical shape or a generally cylindrical shape as an overall shape, and includes a shape whose diameter varies somewhat depending on a portion in the axial direction. This includes a crown shape in which the diameter of the central portion in the axial direction is larger than both ends, and an inverted crown shape in which the diameter of the central portion in the axial direction is smaller than both ends. The core may have a multilayer structure laminated in the radial direction. The surface may be smooth, but it does not have to be, and grooves and irregularities may be formed.

In the present invention, the “material for forming the core” refers to a material for forming the surface of the core.
Preferably, metals such as iron, SUS, and aluminum, FRP using carbon fiber as a reinforcing member, and the like are preferably used.

  In the present invention, the “soft material” is preferably a rubber-based material including one or more of chloroprene-based, urethane-based, and chlorosulfonated polyethylene-based materials. Anything The soft material layer may be a layer in which a plurality of material layers are stacked in the radial direction. Also, the surface of this layer should have a substantially cylindrical shape, and like the “core”, a crown shape, an inverted crown shape, or the like is also used depending on the purpose. Further, the surface does not necessarily have to be smooth, and grooves and irregularities may be formed.

  In the present invention, the “amorphous carbon-like film” means a process for forming a hard film of carbon on the surface of a flexible material. For example, if a plasma CVD (chemical vapor deposition) using a hydrocarbon gas such as methane, acetylene, or ethylene is used, a hard film can be formed on a soft material layer such as rubber. it can. This coating is often amorphous. In the present invention, since it is formed on the surface of a relatively soft material, it preferably has a structure that can follow the deformation of the surface of the soft material.

  In addition to the plasma CVD method described above, methods such as a sputtering method, an ion beam method, and an ion plating method can be used as the film forming means. This film may be called a “diamond-like carbon film (DLC film)”. Such a carbon film is characterized by a high durability because it has a static friction coefficient on the surface that is much smaller than that of rubber or the like and is resistant to wear.

  In the present invention, the “amorphous carbon-like film composed of a large number of small regions” means that the roll surface is divided into a large number of small regions, and there is a portion of a hard material that is integrated into each small region. When the pressure in the normal direction of the surface is applied from and the soft material tries to deform, each small region can move to follow the deformation of the soft material independently of the adjacent small region It means that it is formed. Examples of this structure are disclosed in Patent Documents 5 and 6 as examples of an amorphous carbon film treated on a rubber surface.

  In the present invention, the “thickness of the amorphous carbon-like film” means an average thickness in a region used by a method of use in accordance with the purpose of a roll of a hard material surface layer. This thickness was determined by observing a cross section (a plane including the radial direction of the roll) of a “soft material layer” including a “layer consisting of a large number of small regions” cut out from the roll. When the “layer consisting of a large number of small regions” is thick, it may be observed with an optical microscope, and when thin, it may be observed with an SEM (scanning electron microscope).

  In the present invention, “hardness” is measured by a measuring method defined in JIS K6253 type A. A JIS spring type hardness tester defined in this standard is placed horizontally on a roll that is placed horizontally in the axial direction, and the hardness display when a load of 9.8 N (1 kg weight) is applied is read. The values are measured at arbitrary five points separated as appropriate, and the average value is used. However, in the case of a roll with a groove, the measurement is performed at a portion having no groove. Five samples are cut out from arbitrary positions in the rotation direction and the axial direction of the roll, and the average value is taken as the measurement value.

  In the present invention, the “hydrophobic layer” is a compound layer having a property that excludes water molecules and is not easily adapted to water. In the present invention, the “hydrophobic hydrophobic layer” is a compound layer that contains hydrocarbons and excludes water molecules and has a property that is difficult to adapt to water. The “hydrocarbon hydrophobic layer” obtained by modifying the rubber surface means that the number of carbon-carbon double bonds is less than that of ordinary rubber. In particular, it is easy to add halogen (for example, chlorine or bromine) or various acids (for example, hydrogen halide, sulfuric acid, carboxylic acid) to the carbon-carbon double bond, and the double bond between carbon atoms. Changes to a single bond.

  According to the present invention, as will be described later, as is clear from the comparison between Examples and Comparative Examples, it is possible to obtain a contact pressure roll that maintains a low friction coefficient and a small triboelectric charge amount over a long period of time. The durability of the roll can be improved. Furthermore, the cleaning of the contact pressure roll also has an effect that the outermost amorphous carbon film is difficult to peel off.

  By using this contact pressure roll, wrinkles of the sheet roll body can be suppressed and the triboelectric charge amount can be reduced over a long period of time, so that a sheet roll body of good quality can be obtained.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking a rubber roll using rubber as a “soft material” as an example. Note that the present invention is not limited to this.

  Hereinafter, an example in which a film is used as the electrically insulating sheet will be described with reference to the drawings. Note that the present invention is not limited to this.

  FIG. 1 is a cross-sectional view in a plane perpendicular to the roll axis direction schematically showing the configuration of the rubber roll of the present embodiment. In FIG. 1, a rubber roll 1 has a rubber layer 3 wound around a core 2 and an amorphous carbon film (hereinafter abbreviated as diamond-like carbon film, DLC film) 5 formed on the outermost surface. . A hydrocarbon-based hydrophobic layer 4 is formed in an intermediate layer between the rubber layer 3 and the amorphous carbon film (DLC film) 5.

  The core 2 of the rubber roll 1 shown in FIG. 1 is an iron core, and the rubber layer 3 is a rubber mixture of chloroprene rubber and acrylonitrile rubber having a hardness of 40 degrees.

  The hydrocarbon-based hydrophobic layer 4 is a layer for improving the adhesion between the rubber layer 3 and the amorphous carbon film (DLC film) 5. In particular, it is an adhesion layer for making it difficult for the DLC film to be peeled off when the rubber roll surface is wiped and cleaned with a liquid. The hydrocarbon-based hydrophobic layer 4 can improve wiping resistance.

  The DLC film is difficult to peel off due to mechanical friction with the film, but when liquids such as water and chemicals permeate the interface between the DLC film and the rubber, the bond between the DLC film and the rubber layer weakens, and the adhesion at the interface is poor. The DLC film may be peeled off due to stability.

  When used as a contact pressure roll, if dust or dust adheres, the pressed sheet roll body is scratched, so that the roll is cleaned as necessary. At this time, the roll is wiped with a waste cloth moistened with liquid to remove dust and dust. A solution having good permeability such as water or alcohol is often used for the solution. At this time, in the amorphous carbon film (DLC film) 5 divided into a large number of minute regions, a small amount of liquid may permeate from the cracks and reach the interface between the rubber layer and the DLC film.

When the liquid permeates the interface between the rubber layer and the DLC film, the bond between the rubber layer and the DLC film is weakened, and the DLC film is easily peeled off from the rubber layer. This depends on the type of liquid used, but the double bond of the rubber layer tends to cause an addition reaction with the liquid, and the state of the rubber layer changes, resulting in a low adhesion to the DLC film. Presumed to be. Therefore, as a result of intensive studies, the present inventors have formed an interface between the hydrocarbon-based hydrophobic layer 4 between the amorphous carbon-like film (DLC film) 5 and the rubber layer 3 to thereby form amorphous carbon. The present inventors have found that the film-like film (DLC film) 5 is extremely difficult to be peeled off, and have reached the present invention. The hydrocarbon-based hydrophobic layer 4 and the amorphous carbon-like film (DLC film) 5 are easily bonded to each other because they contain carbon atoms, and the adhesion is increased. Also, the hydrocarbon-based hydrophobic layer 4 and the rubber layer 3 Is presumed that since both contain carbon atoms, they are easy to bond and the adhesion is increased. By forming an interface between the hydrocarbon-based hydrophobic layer 4 between the amorphous carbon-like film (DLC film) 5 and the rubber layer 3, the liquid such as water and chemicals is amorphous carbon-like film (DLC film). The hydrocarbon hydrophobic layer 4 is chemically stable even if it penetrates from the cracks 5, and the adhesion between the hydrocarbon hydrophobic layer 4 and the amorphous carbon film (DLC film) 5 is unlikely to decrease. I found out that That is, the layer bonded to the DLC film does not change chemically even when the liquid permeates, the adhesion with the DLC film does not change, and has a hydrophobic property to prevent penetration into the lower rubber layer 3. I guess it is necessary. That is, it is considered that the hydrocarbon-based hydrophobic layer 4 preferably satisfies the following requirements.
(1) It has a hydrophobic property with low affinity with a polar liquid such as water, alcohol, or a cleaning material.
(2) It is made of a hydrocarbon material, and has a characteristic carbon-carbon double bond of the rubber molecule less than that of the lower rubber layer. The static friction coefficient of the rubber surface in such a state is in the range of 0.3 to 0.65.

  The measurement of the hydrocarbon-based hydrophobic layer 4 is performed as follows. When the surface of the hydrocarbon-based hydrophobic layer 4 is wetted with a waste dipped in distilled water, the determination is made by the fact that the distilled water is repelled into droplets. If the contact angle of water droplets on the surface of the hydrocarbon-based hydrophobic layer 4 is 60 degrees or more, it is determined to have hydrophobicity.

  Hereinafter, a method for obtaining an interface satisfying the requirements will be described in detail.

  As a method for forming such a preferred hydrocarbon-based hydrophobic layer 4, the surface of the rubber layer 3 may be bonded and formed using an adhesive or the like, but as a simpler method, the surface of the rubber is modified. The method to do is effective. If the rubber surface is modified by chemical treatment, the friction coefficient of the surface can be reduced. Since the DLC film 5 is a thin layer, the static friction coefficient of the hydrocarbon-based hydrophobic layer 4 may be affected. By setting the static friction coefficient of the hydrocarbon-based hydrophobic layer 4 in the above range, wiping resistance and a low friction coefficient can be secured at the same time. In addition, the description regarding a static friction coefficient is mentioned later. However, the modified film on the surface of the rubber roll has ductility and bending resistance, and is treated so that it exhibits the same behavior as the deformation of the rubber, following the elasticity and flexibility of the rubber and not damaging the rubber properties. It is preferable to consider so.

  The rubber layer 3 is made of a rubber material and has a double bond having an unsaturated structure in the polymer main chain. For example, diene rubber nitrile rubber (abbreviated as NBR) and chloroprene rubber (abbreviated as CR) are typical. By subjecting this double bond to an addition reaction, the desired hydrocarbon-based hydrophobic layer 4 can be formed.

Examples of compounds that strongly add to double bonds include alcohol-based, aromatic-based, paraffin-based, and ketone-based solutions mainly composed of alkyl hypohalide (ROX R: alkyl group, O: oxygen X: halogen group). There is. Alkyl hypohalide is a material having a halogenating ability. For example, tertiary butyl hypo chloride (CH) ₃ —COCl. Moreover, acids, such as a hydrofluoric acid and a sulfuric acid, are also mentioned. These compounds react with a carbon-carbon double bond of a diene rubber compound to cause a halogenation reaction or a hydrogenation reaction on the rubber surface. In this case, for example, the Cl group of tertiary butyl hypo chloride is added to the carbon forming the double bond of the rubber to cause halogenation. That is, the rubber compound is halogenated to reduce double bonds, and at the same time, the rubber surface becomes more hydrophobic. When the surface is modified to form a hydrocarbon-based hydrophobic layer, for example, when water droplets are dropped on a rubber roll, the water repellency is better than that of the original rubber. Further, the static friction coefficient is in the range of 0.3 to 0.65, and the slip property is improved as compared with the original rubber. As an example of causing an addition reaction to a double bond, the above-mentioned compounds are listed. However, it has a hydrophobic property with low affinity with polar liquids such as water, alcohol, and cleaning materials, and is a characteristic carbon of rubber molecules. Any method may be used as long as it is a chemical treatment capable of realizing a state in which the number of carbon double bonds is less than that of the lower rubber layer.

  The reactivity of the double bond is high in NBR having a cyano group which is an electron donating group, and low in CR having an electron withdrawing group. For this reason, the reformability varies depending on the rubber material. When nitrile rubber is mixed with chloroprene rubber, the reactivity with the double bond is improved. That is, NBR is blended with chloroprene rubber and the addition reactivity is easily improved.

  As described above, by forming the hydrocarbon-based hydrophobic layer 4 between the rubber layer 3 and the amorphous carbon-like film (DLC film) 5, a minute amount of cracks are formed from the cracks forming a large number of regions. Even if the liquid permeates, the hydrocarbon-based hydrophobic layer 4 does not change at all, and the adhesion with the DLC film can be maintained. Further, the hydrophobic property of repelling polar solvents such as water makes it possible to suppress the influence on the rubber layer, thereby eliminating the problem that the DLC film is peeled off by wiping and improving the wiping resistance.

  The amorphous carbon-like film (DLC film) 5 is formed using the method shown in Patent Document 5 or Patent Document 6, and in particular, rubber as a base material has flexibility. In order to follow the flexibility of this rubber, the DLC film is formed in a form divided into many small regions by cracks.

  The amorphous carbon film (DLC film) 5 is formed by using a molecular gas containing carbon, oxygen and hydrogen by plasma CVD shown in FIG. 3, and a film thickness of 0.1 μm to 3.0 μm on the outermost layer of the rubber roll. The film is formed. If the DLC film thickness can be measured from the state before film formation, as a simple method, a masked Si substrate is placed in the vicinity of the processed roll, and the step between the mask portion and the non-mask portion is determined. Can be measured as the thickness of the DLC film.

  FIG. 3 shows a configuration of a film forming apparatus for processing an amorphous carbon film (DLC film) 5 by a plasma CVD method on the surface of a roll having a flexible material layer such as rubber or a hydrocarbon hydrophobic layer 4. This is an example schematically shown. In FIG. 3, the vacuum container 12 is decompressed by the vacuum exhaust mechanism 13. Inside the vacuum vessel 12, a rubber roll 14 for performing a surface treatment is set with a rotation driving means 15. Electric power is supplied from the power source 17 to the plasma generating electrode 16, and the hydrocarbon gas supplied from the gas introduction pipe 18 is turned into plasma. While rotating the roll at a speed of 1 to 10 rpm, an amorphous carbon film (DLC film) 5 having a predetermined thickness is formed on the surface of the rubber roll. At this time, the core metal of the rubber roll 12 uses iron and is electrically grounded, and the AC power from the high frequency power source 17 is interposed between the plasma generation electrode 16 via the rubber layer 3 and the hydrocarbon-based hydrophobic layer 4. Although plasma is generated, a counter electrode may be provided separately from the rubber roll 12, and plasma generation by DC power is also possible. Alternatively, a rubber roll may be connected to the plasma generation electrode 16 to generate plasma with the ground electrode. Note that when the amorphous carbon-like film is formed, it is not always necessary to continuously rotate the roll. For example, the amorphous carbon-like film may be divided into several parts in the circumferential direction of the roll.

  The film formation procedure of the amorphous carbon film (DLC film) 5 includes, for example, introducing an argon gas from the gas inlet 18 to clean the surface of the rubber roll, and then, from the gas inlet 16, methane gas, acetylene gas, A DLC film is formed by sequentially introducing cyclohexane gas, acetone gas containing oxygen atoms, or the like.

The amorphous carbon film (DLC film) 5 is divided into many small regions by cracks. The average area of each region surrounded by the cracks is in the range of 0.15 × 10 ⁻³ mm ² to 20 × 10 ⁻³ mm ² . The average area of each region surrounded by the cracks is obtained as follows. Each of five portions of the same area (500 μm × 500 μm = 0.25 mm ² ) arbitrarily selected in the DLC film was magnified 250 times with a SEM (scanning electron microscope), and the region in the area portion was observed. Count the number and divide the area of the part (0.25 mm ² ) by the number of the areas to obtain the area, find the average value in the five parts thus obtained, and calculate this for each area surrounded by the cracks The average area.

  In addition to the method of directly forming the DLC film on the rubber roll, another method for forming the amorphous carbon film (DLC film) 5 on the rubber roll is a sheet-like or ribbon-like rubber (hydrocarbon hydrophobic layer). It is also possible to form a rubber roll with a DLC film by wrapping these rubber sheets or rubber ribbon around a rubber roll having a core or a base rubber layer. In this case, a roll rotating mechanism is not necessary for the film forming apparatus, and the film forming apparatus can be downsized.

  It should be noted that if the amorphous carbon film (DLC film) 5 composed of a large number of small regions is too thin, it is difficult to form a uniform thickness and an island-like film is formed, and the film is not continuous. It is not preferable. On the other hand, if the film is too thick, the heat load on the rubber during film formation will increase, causing deterioration of the rubber, and the flexibility of the layer consisting of many small regions will be inferior, so 0.1 μm to 3 μm. Desirably, and more desirably, 0.4 μm to 1 μm.

  Next, a winding device having a contact pressure roll using the roll of the present invention as the contact pressure roll will be described.

  FIG. 2 is a side view schematically showing a configuration used in an embodiment in which a rubber roll is used as a contact roll for winding a film. A sheet conveying unit that continuously travels the sheet S in a predetermined movement direction is provided. A part of this sheet conveying means has a rotatable conveying roll 6. The predetermined moving direction of the sheet S is indicated by an arrow SD. The sheet S moves while traveling in the direction of the arrow SD while being supported by the transport roll 6 or the like. The winding core 7 is rotated by a driving means (not shown) to wind the sheet S and form a sheet roll body 8. The rubber roll 1 described in FIG. 1 is rotatably supported as a contact pressure roll, and is connected to a hydraulic cylinder (not shown), and is urged toward the sheet roll body 8 by the action of the hydraulic cylinder. It is in contact with the body 8. The rubber roll 1 is a contact pressure roll. In FIG. 2, the static eliminator is arranged toward the sheet roll body 8. A corona discharge electrode 9 is provided, a shield electrode 10 is provided in the vicinity of the corona discharge electrode 9, and the corona discharge electrode is connected to an AC power source 11. A high voltage is applied to the corona discharge electrode 9 to generate positive and negative ions, and the ions are supplied to the sheet roll body 8 to neutralize the charge of the sheet roll body 8.

  Although only the winding unit is shown in FIG. 2, the sheet S is supplied to the winding unit from the following two steps (not shown).

  The first step is to extrude the molten thermoplastic resin into a sheet form from the die, rapidly cool it on a cooling drum and solidify it, and in some cases, stretch it in the longitudinal direction and the width direction with a stretching device, It is supplied to the winding unit in FIG. The sheet is wound around the gripped winding core 7 to obtain a sheet roll body 8 as an intermediate product. In the second step, the intermediate product is then unwound by a slitter if necessary, passed through a transport roll, slit to a predetermined width using a cutter, and then supplied to the winding unit in FIG. The sheet is wound around the winding core 7 to obtain a sheet roll body 8 as a product. It is preferable to use the contact pressure roll according to the present invention as the contact pressure roll of the winder or the contact pressure roll of the slitter in such a film forming process.

  Here, the core which comprises a contact pressure roll is demonstrated below.

  The configuration of FIG. 5 is adopted as an aspect of the contact pressure roll. The contact pressure roll includes a cylindrical tubular rotating body 30, a shaft 28 concentrically inserted into the cylindrical rotating body, a bearing fitted between the shaft and the cylindrical rotating body, and a shaft of the bearing. The spherical bearing 29 is mounted at two locations spaced apart from each other in the longitudinal direction. The spherical bearing 29 supports the cylindrical rotating body 30 so as to be rotatable with respect to the shaft 28, and is free even when the pressing force by the pressing means acts on the cylindrical rotating body and bends. For example, rubber or plastics may be used as an elastic material. However, in order to obtain a more stable rotation, the positional relationship between the cylindrical rotating body and the shaft is kept constant. Further, a bearing that allows the outer ring and the inner ring to move in a spherical shape, that is, a ball bearing, a self-aligning roller bearing, a spherical plain bearing, or the like is more preferable. The spherical bearing 29 needs to be mounted at a certain interval in the longitudinal direction of the shaft, that is, at two locations separated by a bearing interval.

  Moreover, as another aspect of the contact pressure roll, the shaft 28 is inserted concentrically into the cylindrical rotating body 30, and the two are connected only at the center in the width direction. A thick-diameter portion is formed at the central portion in the longitudinal direction of the shaft, and an elastic support member is interposed so as to fill a gap between the shaft and the cylindrical rotating body 30 in a central region having a length including the large-diameter portion. The two are linked. As described above, the pressure contact roll is configured such that only the central portion in the width direction of the cylindrical rotating body is connected to the shaft by the elastic support member, but the elastic support member is not necessarily filled over the entire central portion in the width direction. However, it may be arranged symmetrically with respect to the center in the width direction only at both ends of the center portion in the width direction.

  As the material of the shaft 28 and the cylindrical rotating body 30, any general structural material such as carbon steel can be used. More preferably, fiber reinforced resin or fiber reinforced metal is used. When such a material is used for the contact pressure roll, it can be applied to increase the speed by setting a high natural frequency, and the handling property is improved by reducing the weight.

  The structure of the preferable roll using a fiber reinforced resin, especially a carbon fiber reinforced epoxy resin is demonstrated below. FIG. 6 shows a roll according to an embodiment of the present invention. The roll axis is a solid axis 32 made of FRP in which reinforcing fibers are arranged in the axial direction of the roll. In FIG. 6, journals are joined to both ends of the FRP solid shaft 32 in which reinforcing fibers are arranged in the axial direction via a heat-resistant adhesive. As the material of the journal, any of resin, metal, etc. may be used, and the joining to the FRP solid shaft 32 is performed by fitting adhesion, press fitting or the like, but preferably the shaft end surface of the FRP solid shaft 32 is drilled. The journal is preferably fitted and bonded to the hole. As a result, there is no joint with the metal journal on the outer periphery of the FRP solid shaft 32, and rubber winding can be easily performed. As the soft material covering the outer periphery of the FRP solid shaft 32, rubber, metal, ceramic, resin, or the like can be selected according to the application. In FIG. 6, a hydrocarbon hydrophobic layer 4 and an amorphous carbon film (DLC film) 5 are formed on the surface layer of the rubber layer 3.

Here, the FRP solid shaft 32 is made of polyacrylonitrile-based carbon fiber or pitch-based carbon fiber as the reinforcing fiber, and preferably the reinforcing fiber has a Young's modulus of 50 t / mm ² or more, whereby the FRP solid shaft 32 High rigidity can be realized. A thermosetting resin such as an epoxy resin is used as the matrix resin. Further, the fiber volume content of the FRP solid shaft 32 is in the range of 50% to 75%, preferably in the range of 60% to 70%, so that the hollow body is manufactured by the filament winding method or the sheet rolling method. High rigidity can be realized compared to.

  Since the rubber roll 1 according to the present embodiment has a small coefficient of friction with the film, it is possible to prevent the generation of wrinkles and to reduce the frictional charge, so that the sheet roll body 8 of good quality can be wound up.

  The reason why the roll body 21 without wrinkles or charging defects can be obtained by using the rubber roll 1 having a low friction coefficient as the contact pressure roll will be described below.

  In general, in order to wind up the sheet S without wrinkles, it is necessary that there is no wrinkle when the sheet S enters a contact pressure point with the contact pressure roll 1. At this time, if the contact pressure roll 1 hugging the sheet S and the sheet S are slippery, wrinkles are hardly formed due to the inherent rigidity of the sheet, and the wrinkles can be extended. In general, when the sheet roll body 8 is pressed by the contact roll 1, the rubber is deformed, so that the surface speed of the rubber does not coincide with the surface speed of the sheet roll body 8, and friction due to the speed difference always occurs. Since this frictional charge is a cause of charging defects that lower the quality of the sheet roll body 8, by reducing the friction coefficient of the rubber surface, this friction can be reduced, and as a result, the frictional charge can be reduced. It is.

  The friction coefficient of the rubber roll for the contact pressure roll will be described below.

  According to the technique of Patent Document 1, the surface roughness of the roll made of rubber is in the range of 0.2 to 1.0 μm in centerline average roughness (Ra), and the static friction coefficient with respect to the plastic film on the surface of the roll is 0.8. It is disclosed that a plastic film is conveyed using a rubber roll described below. Here, in order to obtain a low coefficient of friction, a method of polishing a roll surface with a nonwoven fabric made of ultrafine fibers and a method of ultraviolet treatment are disclosed. As the non-woven fabric used for the surface treatment, commercially available ones can be used, for example, artificial leather-like EXSEINE (manufactured by Toray Industries, Inc.) can be used.

  On the other hand, since the surface of the film has been required to be smoother and flat in recent years, the surface of the rubber roll is relatively required to realize a low triboelectric charge amount with a low friction coefficient. In particular, in the contact pressure roll that winds the sheet while pressing the sheet roll body 8, the film surface and the rubber roll surface are in close contact with each other as compared with the case of transporting the film, and therefore, the triboelectric charge is strong. For this reason, generation of discharge traces due to frictional charging and local contact between the sheets due to charging cause wrinkles in the roll body.

  Here, the method disclosed in Patent Document 2 is compared with the method of the present invention, and it is shown below that the coefficient of static friction is much lower than that of the prior art. It has been found that, by reducing the static friction coefficient to 0.3 or less according to the present invention, the frictional charging of the sheet roll body is suppressed to a sufficiently low level and wrinkles can be avoided.

The measurement of the coefficient of friction shown in Patent Document 2 is performed as follows. A belt-like film is hung along the fixed rubber roll, and a weight of weight W [N] is suspended from one end of the film. The film is hung on a rubber roll at a winding angle θ [rad], the other end is pulled through a load meter, and the friction force generated between the film and the film is measured with the load meter. A dynamic friction coefficient μ is obtained from the obtained load meter reading T [N] by the following equation. μ = (1 / θ) ln (T / W)
On the other hand, in the method for measuring the static friction coefficient of the present invention, the static friction coefficient when the film and the rubber roll surface start to move from a stationary state is measured. In general, the dynamic coefficient of friction is smaller than the static coefficient of friction. For example, when the surface of the rubber roll on which the amorphous carbon film (DLC film) of the present invention is formed is measured by the method of Patent Document 2 and the two methods of the present invention, the static friction in the measurement method of the present invention is determined. The coefficient is 0.2 to 0.28, and in the method of Patent Document 2, the value is 0.1 to 0.15. Further, when a rubber roll measured with a value of 0.3 to 0.4 by the method of Patent Document 2, that is, a rubber roll whose surface is polished with ultrafine fibers and subjected to ultraviolet treatment, is measured by the method of the present invention, 0.6 is obtained. To 0.7. That is, it can be seen that the friction coefficient of the rubber roll of the present invention is a rubber roll having such a low coefficient of friction that the technique shown in Patent Document 2 cannot be realized at all.

  Although it is the lower limit of the static friction coefficient, if it is too low, the sheet tends to slip through at the pressure contact portion with the sheet roll body, so 0.1 or more is preferable.

  Next, rubber hardness will be described.

  Further, as the contact pressure roll 1, a soft rubber is required in order to eliminate air by following the minute unevenness of the sheet roll body 8 caused by uneven thickness of the film. Therefore, in order to satisfy this requirement, a rubber hardness of 55 degrees or less is preferable. When the rubber roll exceeds 55 degrees, it cannot follow the film thickness unevenness, and a difference occurs in the contact pressure state. On the other hand, there is generally a correlation between rubber hardness and ease of scraping, and in the prior art, the rubber hardness has to be relatively high. The rubber roll having the amorphous carbon-like film 5 (DLC film) as the outermost layer of the present invention can suppress the wear of the unevenness of the surface by the DLC film, so that a rubber roll with low hardness can be realized. The lower limit of the rubber hardness is desirably 35 degrees or more from the viewpoint of rubber moldability. Therefore, from the viewpoint of the moldability of the rubber and the ability to follow minute irregularities, a range of 35 to 55 degrees is set as the rubber hardness range.

  Next, the surface roughness of the rubber roll will be described below.

  The irregularities on the surface of the rubber roll will be worn and flattened by repeated contact with the film, but the rubber roll having the amorphous carbon-like film 5 (DLC film) on the outermost layer of the present invention is formed by the DLC film. Since it is possible to suppress wear on the surface irregularities, it is possible to realize a rubber roll having a relatively rough rubber surface, which has been difficult in the past. However, as the surface roughness increases, there is a concern that the effective contact area with the film becomes too small, and the unevenness affects the roughness of the film surface, so the center line average roughness is 1.4 μm or less. preferable. Also, polishing the surface of the rubber roll to have a center line average roughness of less than 0.1 μm is technically difficult and costly. In particular, it is difficult and practically impossible to polish the surface of the relatively soft rubber layer 3 of 55 degrees or less. That is, the centerline average roughness of the rubber roll surface is preferably in the range of 0.1 μm to 1.4 μm. More preferably, the range is 0.4 to 1.4 μm.

  A winding device having a contact pressure roll whose surface shape, friction coefficient and frictional charging characteristics are less likely to change even after being used for a long period of time. The quality of is stabilized. It is advantageous that the contact pressure roll has a small diameter in order to efficiently remove air. However, when a contact pressure roll having a small diameter is used, the smaller the diameter, the greater the number of rotations of the roll and the greater the number of times of contact with the roll body. Naturally, the more the number of contact, the more easily the rubber roll is worn. That is, a contact pressure roll having a small diameter is preferable because the effect of forming the DLC film of the present invention is high. The diameter of the contact pressure roll is preferably in the range of 25 mm to 200 mm. In particular, since the contact pressure roll having a small diameter of 120 mm or less has a large number of contacts with the sheet roll body, the contact pressure roll of the present invention is effectively used.

Hereinafter, the present invention will be described using examples.
The following evaluation methods were used.
-Evaluation method of static friction coefficient The static friction coefficient used the HEIDON type | formula friction measuring method. A value measured by rubbing with a polyethylene terephthalate film “Lumirror” manufactured by Toray Industries, Inc. having a thickness of 6.3 μm and a surface centerline surface average roughness SRa of 20 nm. The centerline plane average roughness SRa value of the target film is a value corresponding to Ra specified in JIS B 0601, and an optical stylus type three-dimensional roughness meter (ET-30HK) manufactured by Kosaka Laboratory is used. The measurement direction was the width direction, the cut-off value was 0.08 mm, the measurement length was 0.1 to 0.25 mm, the feed pitch was 0.2 μm, the measurement speed was 20 μm / second, and the number of measurements was 100. In addition, as a measuring device for the static friction coefficient, a tribo gear TYPE 94i manufactured by HEIDON is used. The polyethylene terephthalate film is attached to the measuring slider of the measuring instrument, and this measuring instrument is pressed against the surface of the roll (the part used in accordance with the purpose of the roll) placed so that the axial direction is horizontal. Was performed five times, and the average value of the displayed static friction coefficients was obtained.

The measurement was performed before the DLC film was formed (after the formation when the hydrophobic layer was formed) and after the DLC film was formed (except for Comparative Example 5).
-Evaluation method of surface roughness of rubber roll An ultra-deep shape measuring microscope VK8500 manufactured by Keyence Corporation was used. A rubber roll was fixed on the microscope stage, the surface shape was taken as image data at a magnification of 2000 times and a height direction resolution of 0.05 μm, and the line roughness between two points was read from the profile as the center line roughness (SRa). The laser and camera shutter were measured in automatic mode. The measurement was performed three times while changing the position of the rubber roll, and the average value of the surface roughness was obtained.
-Evaluation method of triboelectric charge quantity FIG. 4: is a perspective view which shows the evaluation method of the charge used by an Example and a comparative example.

  FIG. 4 is a schematic view for measuring the triboelectric charge amount of the rubber roll 1. The charged measurement sheet 24 is disposed on an insulating plate 22 made of a metal plate 21 and an acrylic plate. The metal plate 21 and the insulating plate 22 are plates having a smooth surface of 500 mm square, and the metal plate 21 is connected to the ground. The charged sheet to be measured is disposed on the same underlay sheet 23 in order to suppress frictional charging with the insulating plate 22. In this state, as shown in FIG. 4, the triboelectric charge is triboelectrically rolled by hand at a speed of 50 mm / second so as not to slide the rubber roll 1 on the charged sheet 24. Thereafter, the charged sheet to be measured 24 is gripped in the air, and the surface potential of the charged sheet to be measured 24 with respect to the ground is measured with an electrometer (model-523 manufactured by Trek) at a distance of 40 mm, and the average value is obtained expressed. This measurement was performed in an indoor environment with an air temperature of 23 ° C. and a humidity of 50% RH.

As the film to be charged, a polyethylene terephthalate film “Lumirror 6XV672” manufactured by Toray Industries, Inc. having a thickness of 6.3 μm and a surface centerline surface average roughness SRa = 20 nm cut out to 200 mm × 300 mm was used. Evaluation results were evaluated in the following three stages.
・: Low triboelectric charge. State where the absolute value of the surface potential is within 3 kV: State where the absolute value of the surface potential exceeds 3 kV and within 8 kV ×: The amount of frictional charge is large. A state where the absolute value of the surface potential exceeds 8 kV.
-Evaluation method of wiping resistance With respect to the adhesion between the rubber and the carbon-like film layer (DLC film), the durability when wiping the surface of the roll with a cloth soaked with liquid was evaluated. The product name: Solmix AP-7 (Nihon Alcohol Sales) diluted with distilled water was used as the waste. The waste was pressed against the roll, and while rotating the roll slowly about 6 times / minute, the roll surface was wiped 10 times from the roll length direction. It was evaluated in the following two stages whether there was a carbon-like film adhering to the wiped waste or whether the roll was peeled off.
OK: No adhesion to the waste and no peeling on the roll.
NG: Adhering to the waste and there is a peeling part on the roll.
-Evaluation of the wound sheet roll body It arranged as a contact pressure roll as FIG. 2, and wound up the film. FIG. 2 shows only the winding part. The film was unwound and slit in a wide state, and then conveyed to the winding unit in FIG. The film is a PET (polyethylene terephthalate) film with a thickness of 6.3 μm, slit to have a width of 200 mm, a winding speed of 240 m / min, a winding length of 2000 m, and a film roll body on a glass fiber reinforced resin core. Winded up. As for the winding conditions, the pressure for pressing the contact pressure roll against the roll body was 200 N / m, and the tension applied to the film was 300 N / m. The state of the rolled up sheet roll body was evaluated by the following items.
· Wrinkle occurrence · Charging defect occurrence [Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3] (Evaluation of DLC film with or without hydrocarbon-based hydrophobic layer 1: Chloroprene and acrylonitrile rubber)
The roll of Example 1 was configured as follows. A contact pressure roll configured as shown in FIG. 1 was prepared. As the rubber layer, a rubber layer made of chloroprene rubber and acrylonitrile rubber and having a rubber hardness of 45 degrees was formed. Was used. The rubber layer 3 was polished with a trade name: EXSEINE (manufactured by Toray Industries, Inc.) and subsequently treated with a chemical containing halogen to form a hydrocarbon-based hydrophobic layer on the surface side of the rubber layer. The hydrocarbon-based hydrophobic layer has fewer double bonds than a normal rubber layer. Subsequently, a DLC film was formed by a plasma CVD method shown in FIG. 3 using a molecular gas containing carbon, oxygen, and hydrogen as shown in Patent Document 6 to a thickness of 0.5 μm. The formed DLC film thickness was determined by setting a masked Si substrate in the vicinity of the processed roll and measuring the step between the mask portion and the non-mask portion.

  As Comparative Example 1, a rubber layer made of chloroprene rubber and having a rubber hardness of 45 degrees was formed. The rubber roll was polished with Exeine manufactured by Toray. A DLC film was formed in the same manner as in Example 1 without forming a hydrocarbon-based hydrophobic layer.

  As Comparative Example 2, a rubber layer made of chloroprene rubber and acrylonitrile rubber and having a rubber hardness of 40 degrees was formed as the rubber layer. The rubber roll was polished with the trade name: EXSEINE (made by Toray Industries, Inc.). A DLC film was formed in the same manner as in Example 1 without forming a hydrocarbon-based hydrophobic layer.

  As Comparative Example 3, a rubber layer made of conductive silicon and having a rubber hardness of 50 degrees was formed. A DLC film was formed in the same manner as in Example 1 without forming a hydrocarbon-based hydrophobic layer.

  The results are shown in Table 1.

Table 1 shows that when a DLC film is formed on a rubber roll, the static friction coefficient is small and the triboelectric charge amount is small. However, a roll having good water resistance and no DLC film peeling is formed by forming a hydrocarbon-based hydrophobic layer between the rubber layer and the DLC film, and has a static friction coefficient of 0 before the DLC formation. .65 or less. In addition, although the roll of Example 1 was used as a contact pressure roll for 3 months, there was no fall of <4> wiping resistance.
[Example 2, Comparative Example 4] (Evaluation of DLC film with or without hydrocarbon-based hydrophobic layer 2 chloroprene rubber)
The roll of Example 2 was configured as follows. A contact pressure roll configured as shown in FIG. 1 was prepared. As the rubber layer, a rubber layer made of chloroprene rubber and having a rubber hardness of 40 degrees was formed. A CR roll (chloroprene rubber) (manufactured by Kanuki Roller) was used. This rubber roll was repeatedly infiltrated into the rubber surface using an alcoholic solution of tertiary butyl hypochloride (CH) ₃ —COCl to form a hydrocarbon-based hydrophobic layer on the surface side of the rubber layer. The hydrocarbon-based hydrophobic layer has Cl groups added and has fewer double bonds than a normal rubber layer. The DLC film was formed by a plasma CVD method shown in FIG. 3 using a molecular gas containing carbon, oxygen, and hydrogen as disclosed in Patent Document 7 to a thickness of 0.5 μm. The formed DLC film thickness was determined by setting a masked Si substrate in the vicinity of the processed roll and measuring the step between the mask portion and the non-mask portion.

  As Comparative Example 4, a rubber layer made of chloroprene rubber and having a rubber hardness of 40 degrees was formed as the rubber layer. A CR roll (chloroprene rubber) manufactured by Kakkuri roller was used. A DLC film was formed in the same manner as in Example 1 without forming a hydrocarbon-based hydrophobic layer. Table 2 shows the results.

Table 2 shows that when a DLC film is formed on a rubber roll, the coefficient of static friction is small and the triboelectric charge amount is small. However, a roll having good water resistance and no DLC film peeling is formed by forming a hydrocarbon-based hydrophobic layer between the rubber layer and the DLC film, and has a static friction coefficient of 0 before the DLC formation. .65 or less.
[Example 3, Comparative Example 5, Reference Example 1, Reference Example 2]
(Evaluation of wear resistance of a relatively rough rubber roll having a surface roughness SRa of about 1)
The roll of Example 3 was configured as follows. A contact pressure roll configured as shown in FIG. 1 was prepared. As the rubber layer, a rubber layer made of chloroprene rubber and acrylonitrile rubber and having a rubber hardness of 50 degrees was formed. The rubber roll was polished with a trade name: EXSEINE (manufactured by Toray Industries, Inc.) and subsequently treated with a chemical containing chlorine to form a hydrocarbon-based hydrophobic layer on the surface of the rubber layer. The hydrocarbon-based hydrophobic layer has fewer double bonds than a normal rubber layer. The DLC film was formed on the surface of the hydrophobic layer by the same method as in Example 1. The rubber roll was used for film winding for 2 months to obtain the roll of Reference Example 1.

  As Comparative Example 5, a rubber layer made of chloroprene rubber and having a rubber hardness of 50 degrees was formed as the rubber layer. The rubber roll was polished with a trade name: EXSEINE (manufactured by Toray Industries, Inc.), and then subjected to ultraviolet treatment. This rubber roll was used for winding the film for 2 months to obtain the roll of Reference Example 2.

  The roll of Reference Example 3 was obtained by using the roll of Example 1 for winding a 3-month roll film. Table 3 shows the film winding results of Example 1, Comparative Example 1, and Reference Examples 1 and 2 together with the surface roughness. In addition, the wiping resistance of Reference Examples 1 and 2 was poor.

As is apparent from Table 3, when a roll having a rough surface (Comparative Example 5) is used, the surface roughness changes greatly, the static friction coefficient also increases, and two to three wrinkles are generated in the circumferential direction. The quality of the rolled body was not good. On the other hand, it can be seen that the roll formed with the DLC film has a small change in both the surface roughness and the static friction coefficient even when used for 2 months, and maintains a good state. Normally, the larger the surface roughness of the rubber roll, the easier it is to polish, but even if the roll of Example 1 is used for 2 months, the change in surface roughness and static friction coefficient is small, and good performance is maintained over a long period of time. understood.
[Examples 4 and 5] (Evaluation of rubber hardness, thickness unevenness, and charging defects)
The roll of Example 4 was configured as follows. A contact pressure roll configured as shown in FIG. 1 was prepared. As the rubber layer, a rubber layer made of chloroprene rubber and acrylonitrile rubber and having a conductive rubber hardness of 50 degrees was formed. The rubber roll was polished with a trade name: EXSEINE (manufactured by Toray Industries, Inc.) and subsequently treated with a chemical containing halogen to form a hydrocarbon-based hydrophobic layer on the surface of the rubber layer. The hydrocarbon-based hydrophobic layer has fewer double bonds than a normal rubber layer. The DLC film was formed by the same method as in Example 1.

  As Example 5, a contact pressure roll having a configuration as shown in FIG. As the rubber layer, a rubber layer made of chloroprene rubber and acrylonitrile rubber and having a conductive rubber hardness of 65 degrees was formed. The rubber roll was polished with a trade name: EXSEINE (manufactured by Toray Industries, Inc.) and subsequently treated with a chemical containing halogen to form a hydrocarbon-based hydrophobic layer on the surface of the rubber layer. The hydrocarbon-based hydrophobic layer has fewer double bonds than a normal rubber layer. The DLC film was formed by the same method as in Example 1.

  Table 4 shows the film winding results of Example 1, Example 4, and Example 5. In addition, the wiping-proof result of Example 4 and Example 5 was OK.

  As is apparent from Table 4, since a charged portion may be locally generated when the rubber hardness is high, a soft contact roll having a rubber hardness of 55 degrees or less is effective as a more preferable example.

  In addition to rubber rolls, the present invention may be used as a method for making it difficult for a DLC film to be peeled off even when wiping with a liquid in DLC processing on a flexible substrate, particularly a rubber substrate. For example, it may be used for a support member, a suction stage, and the like.

It is a schematic sectional drawing of the rubber roll concerning embodiment of this invention. It is a schematic sectional drawing of the winding apparatus using the rubber roll for contact pressure concerning embodiment of this invention. It is a block diagram of the DLC film-forming apparatus concerning embodiment of this invention. It is a perspective view which shows the evaluation method of the electrical charge used by the Example and the comparative example. It is a schematic sectional drawing of the contact pressure roll preferably used by this invention. It is a schematic sectional drawing of the fiber reinforced contact pressure roll preferably used by this invention.

Explanation of symbols

S: Sheet 1: Rubber roll 2: Core 3: Rubber layer 4: Hydrophobic hydrophobic layer 5: Amorphous carbon film (DLC film)
6: Transport roll 7: Winding core 8: Sheet roll body 9: Corona discharge electrode 10: Shield electrode 11: AC power source 12: Vacuum vessel 13: Exhaust device 14: Rubber roll to be treated 15: Roll rotation drive device 16: Discharge Electrode 17: Power supply 18: Gas introduction means 21: Metal plate 22: Insulating plate 23: Underlay sheet 24: Charged sheet 28: Shaft 29: Spherical bearing 30: Cylindrical rotating body 32: Solid shaft made of FRP

Claims (8)

A layer of a material softer than the material forming the core is formed on the surface of the substantially cylindrical core, and an amorphous carbon-like film layer is formed in which a large number of small regions are independently formed on the outermost layer. a role that is, between the layers of the layer and the amorphous carbon film as the soft material, a hydrophobic layer having water repellency to repel water is formed, a hydrophobic having the water-repellent A method of forming a layer is a method in which a layer having water repellency is bonded to a surface layer of the soft material layer using an adhesive, or the soft material layer is a rubber layer, and a solution is formed on the rubber surface. carbon in the rubber molecules of the rubber surface by immersing the - characteristics and to Carlo Lumpur that the number of double bonds between the carbon is a method of immersing the rubber surface into the solution so that less than the rubber layer . The roll according to claim 1 , wherein the solution is a solution containing an alkyl hypohalide. The roll according to claim 1 or 2 , wherein a static friction coefficient of a surface of the roll is 0.1 or more and 0.3 or less, and a hardness is in a range of 35 degrees or more and 55 degrees or less. The roll according to any one of claims 1 to 3 , wherein the center line average roughness of the surface of the roll is 0.1 µm or more and 1.4 µm or less. Said layer of amorphous carbon like film roll according to any one of claims 1 to 4, characterized in that a layer having a diamond-like carbon having a thickness of 0.1Myuemu～3myuemu. The roll according to any one of claims 1 to 5 , wherein a coefficient of static friction of a surface of the hydrophobic layer is 0.3 or more and 0.65 or less. An electrically insulating sheet winding device comprising the roll according to any one of claims 1 to 6 as a contact pressure roll. The manufacturing method of the sheet roll body which winds up a sheet | seat using the winding apparatus of Claim 7, and becomes a sheet roll body.

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