TW201617141A - Coating material application method for substrate and coating material application device - Google Patents

Abstract

The purpose of this invention is to apply coating material in a thin and uniform manner with high efficiency to a surface of a substrate made of a single piece or continual glass-made or resin-made film, sheet or board. In this invention, the coating material is supplied to an application roll, and the rotation of the application roll applies the coating material to the surface of the substrate being transported. The substrate is of a single piece or continual type. Among the application roll and a scraper roll rotating and in contact of an outer circumference thereof, at least the scraper roll has a roll surface formed with a hydrophilic DLC film. The scraper roll or a scraper is in contact with the application roll to flatten the coating material applied on the outer circumference of the application roll thinly. The rotation of the application roll makes the outer circumference contact with the substrate being transported to apply the coating material flattened thinly on the application roll to the substrate being transported at ambient temperature and under atmospheric pressure.

Description

Engraving roll with hydrophilic DLC film Field of invention

The present invention relates to a method of applying a coating to a surface of a substrate in a thinness of nanometer (nm) units, and a coating apparatus for the method.

Background of the invention

In recent years, solar photovoltaic generators have become widespread. Solar photovoltaic generators attracted attention as a substitute for nuclear power generators after the Great East Japan Earthquake. However, in the current state of the solar power generator, there is a limit to power generation efficiency and productivity. One of the reasons is that the light/electric conversion efficiency of the optical/electrical conversion element is low. Moreover, since the solar generator installed outside the house is often exposed to wind and rain or dust, scale or dust is deposited on the surface of the windshield of the solar generator to block sunlight, or the refractive index is increased. The deterioration of light is also a major cause.

In order to prevent the dirt of the windshield, reduce the refractive index of the light, and take the sunlight into the light/electric conversion element with good efficiency, it is conventionally formed on the surface of the windshield by a film having a thickness of 100 nm to form a uniform film thickness. Protective film. Most of the conventional film forming methods for functional resist films employ the PVD method (physical vapor deposition method). Because the PVD method is formed in a vacuum environment, There is a difficulty in the deterioration of productivity.

Various techniques have been developed for coating a substrate with a film, particularly a DLC film. One of them has a patent application (Patent Document 1) developed by the applicant of the present application. Patent Document 1 discloses a film forming method of a DLC film for a roll and a DLC film forming roll having a DLC film. In addition, the film formation method of the DLC film and the member having the DLC film formed are patented 2-8. The substrate having the DLC film of Patent Documents 1 to 8 can be improved in abrasion resistance, but because of its water repellency, it is lacking in hydrophilicity, and it is easy to form uneven coating, and the thickness of the coating tends to be uneven, so even if applied to the sun The film formation of the resist film on the windshield surface of the light generator, the prevention of the dirt of the windshield and the improvement of the refractive index are not necessarily sufficient.

Advanced technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2010-189694

Patent Document 2 Japanese Patent Laid-Open Publication No. 2004-323973

Patent Document 3 Japanese Patent Laid-Open Publication No. Hei 11-181572

Patent Document 4 Japanese Patent Laid-Open Publication No. 2003-147527

Patent Document 5 Japanese Patent Laid-Open Publication No. Hei 10-219450

Patent Document 6 Japanese Patent Laid-Open Publication No. Hei 10-29762

Patent Document 7 Japanese Patent Laid-Open Publication No. 2010-137540

Patent Document 8 Japanese Patent Laid-Open Publication No. 2010-137543

Summary of invention

The object of the present invention is to achieve protection for use in various fields. A method and a device for uniformly coating various coating materials on a surface of a substrate to have a desired thickness on the surface of the substrate, preventing dirt, improving light transmittance, improving conductivity, ensuring insulation, and the like.

Coating method for substrate

The coating method for the substrate of the present invention is a doctor roll which is applied to the outer surface of the coating roller to rotate in contact with the coating roller or a doctor blade which is in contact with the coating roller. After the coating roller is rotated at a normal temperature and an atmospheric pressure, the coating material which is thinned by the outer peripheral surface of the coating roller is applied to the substrate which is transferred.

The base material may be a single piece or a continuous shape as long as it is in the form of a film, a sheet, a plate, or a panel. The material and use of the substrate are not limited, regardless of the material or the user. Examples of the material of the substrate include glass, resin, metal, carbon, and the like. Examples of the use of the substrate include a windshield of a solar power generator, a display panel for an optical system (image machine or office machine), a film, a lens, an organic EL film, an inorganic EL film, a TV or a navigation device, and the like. Screens for panels, films, and protective panels for computers and mobile devices, glass for building materials or optical equipment, semiconductor wafers, protective panels for sensors, and other films, sheets, plates, panels, etc. used in various fields. .

The foregoing coatings are anti-corrosive coatings (including functional coatings), conductive coatings, insulating coatings, protective coatings, strengthening coatings, UV light-shielding coatings, antistatic coatings, pigmented coatings, functional coating agents, and the like. The functional coating agent is small in viscosity, liquid, soluble in water or organic solvent, and dried at room temperature. The nature of dryness. Functional coating agents should be as fluid as possible.

A hydrophilic DLC film (Diamond Like Carbon) may be formed on the surface of the roll by either or both of the coating roll and the doctor roll. The doctor roll may also be an engraved roll having a hydrophilic DLC film formed on the surface of the engraved engraving roll with a hydrophilic DLC film. In the engraving, various shapes, patterns, and the like are formed in ultra-fine grooves of a unit of micrometer ( μm ), and it is preferable that the hydrophilic DLC film is formed on the surface and the groove.

The doctor blade may be formed by engraving on the contact surface with the doctor roll and forming a hydrophilic DLC film on the surface thereof. In the same manner as in the case of engraving of the doctor blade, the engraving at this time is formed into various shapes, patterns, and the like in a micro-fine ( μm ) unit ultra-fine groove, and it is preferable to form a film on the surface of the contact surface and the groove of the engraving. There is the aforementioned hydrophilic DLC film.

In the coating method of the present invention, the direction of rotation of the coating roller is opposite to the direction in which the substrate is transferred.

In the above coating method, it is preferable that the rotation speed of the coating roller is one or less times during the period in which the substrate passes below, without causing uneven application on the substrate due to excessive rotation of the coating roller.

In the aforementioned coating method, the coating can be cooled. The cooling may be directly cooled, or may be indirectly cooled by cooling either or both of the doctor roll and the coating roll.

In the above coating method, the thickness of the substrate to be transferred is measured, and the film thickness of the coating material applied to the substrate is adjusted by adjusting the interval between the coating roller and the substrate in accordance with the measurement result. This adjustment can be made by adjusting the spacing between the doctor roll and the applicator roll, or by automatically or manually adjusting the height of the applicator roll.

Paint coating device

The paint application device of the present invention comprises a doctor roll, a coating roll, and a paint supply device, and the paint applied from the paint supply device and applied to the coat roller is thinly contacted by the coating roller and the blade or the blade. Flat, and the coating of the surface is applied to the substrate by the rotation of the coating roller, wherein either or both of the coating roller and the doctor roller are formed on the surface of the roller to form a hydrophilic DLC. In the film, the scraper roller or the scraper may be in contact with the coating roller to thinly coat the coating applied to the outer surface of the coating roller, and the coating on the surface of the coating roller may be rotated by the coating roller. It is applied to a substrate under normal temperature and atmospheric pressure.

As described above, the doctor roll of the coating apparatus may be an engraved roll having a hydrophilic DLC film formed on the surface of the roll and having a hydrophilic DLC film formed on the surface of the ultra-fine groove.

As described above, the doctor blade of the coating device is preferably a one which is engraved on the contact surface with the coating roller and has a hydrophilic DLC film formed on the surface thereof.

The coating device may provide a coating cooling function to cool the coating material in the coating supply device, or may provide a refrigerant passage in either or both of the coating roller and the doctor roller, and cool the roller by a refrigerant flowing through the refrigerant passage. The paint is cooled. At this time, a thermometer for measuring the temperature of the coating agent may be provided, and the coating agent is cooled according to the measurement result. The thermometer should be non-contact.

Effect of coating method on substrate

The coating method for a substrate of the present invention has the following effects.

1. Since it is applied at normal temperature and atmospheric pressure, the coating operation is easy.

2. When the coating is a functional coating agent which is small in viscosity, liquid, water-soluble or organic solvent-soluble and can be dried at room temperature, since the film formed on the substrate is rapidly dried (about several tens of seconds), it is not required Forced drying allows high-speed continuous coating operation, and the productivity of film formation can be improved.

3. When the functional coating agent described above is used, since a functional film before and after the Vickers hardness of 9H is applied, a coated substrate which is less susceptible to damage (weather resistance), for example, a panel for a solar photovoltaic generator can be obtained.

4. When the above-mentioned functional coating agent is used, since the coated substrate having a transmittance of about 80% to 96% can be obtained, the light transmittance is good, and when it is used for the front panel of the solar photovoltaic generator, the waste of sunlight is reduced. The refractive index is small, and a panel which can effectively use sunlight can be obtained.

5. When using the aforementioned functional coating agent, the contact angle 3 of the coating water is due. Since the following functional film is used, it is possible to obtain a panel which is difficult to adhere to water, scale, and the like, and has weather resistance.

6. Since the surface of the coating roll and the doctor roll is formed of a hydrophilic DLC on the surface of the roll, the paint, particularly the water-soluble paint, is easy to adhere to the coating roll, and is easy to expand.

7. By the coating roller contacting the blade roller or the blade, the coating applied to the blade roller is uniformly thin, and a coated substrate having a film having a thickness of 10 nm to 300 nm can be obtained.

8. When the surface of the engraving roll which is engraved in the ultra-fine groove of the surface in micrometers ( μm ) is used to form a DLC film with a DLC film as the doctor roll, the paint is easy to be in contact with the engraving roll. It is easy to form a film of nm unit (10 nm to 300 nm) in a uniform thickness on the surface of the substrate. When the contact surface of the blade is engraved in an ultra-fine groove of a micrometer ( μm ) unit and a DLC film is formed on the surface of the blade, the film is easily formed into a uniform thickness as in the case of using an engraving roll having a DLC film. membrane.

9. When the direction of rotation of the coating roller is different from the direction in which the substrate is transferred, the coating can be applied thinly.

10. When the rotation speed of the coating roller is one rotation or less during the period in which the substrate passes the coating roller, streaks cannot be formed on the coating film (uneven coating unevenness and thickness unevenness), and the film can be formed into a uniform film. thickness.

11. When the coating material is cooled, the film thickness due to the temperature rise can be prevented, and a film having a uniform thickness can be formed.

12. Since the coating roller is in line contact with the substrate, one side of the substrate follows the surface of the substrate, and a coating is applied thereto, so that a film having a uniform thickness can be obtained.

13. It can be used in place of a conventional film forming method such as a spin coating method, a shower coating method, or a dipping method.

14. Since the distance between the coating roller and the substrate is adjusted in accordance with the thickness of the substrate, the film thickness can be adjusted in accordance with the thickness of the substrate.

Paint coating device effect

The coating apparatus of the present invention has the following effects.

1. Since it is placed in an environment of normal temperature and atmospheric pressure, it is easy to set up the job site. Moreover, the coating apparatus is simpler than the conventional PVD method.

2. Since the surface of the coating roller is formed with hydrophilic DLC, it is a non-sticky, liquid, water-soluble or organic solvent-soluble, functional coating agent that is dry at room temperature. The coating film of 10 nm to 300 nm is uniformly formed into a film.

3. Since the surface of the roller of either or both of the coating roller and the doctor roller has a DLC film, the abrasion resistance of the blade roller can be improved, and the blade roller can be made durable. Moreover, since the replacement interval of the blade rolls is increased and the frequency of replacement is reduced, it is easy to maintain and economical. Incidentally, in the case of using a general scraper roller of rubber or nickel/chromium plating, the surface energy of the materials is large (the surface tension is large), and there is frictional heat generated by the friction caused by the contact between the doctor roll and the coating roller or If the coating temperature rises due to the outside air temperature, if at least one of the doctor roll or the coating roll uses the present invention having a hydrophilic DLC film, the surface energy of the rolls is lowered, the hydrophilicity is improved, and between the doctor roll and the coating roll The friction is reduced and the temperature of the coating is also reduced.

4. The doctor roll is an engraving roll of various shapes such as a grid shape, a honeycomb shape, a curved shape, and a diagonal line shape when the ultra-fine groove of the surface micrometer ( μm ) unit is easily formed into the groove, and is easily diffused. To all of the surface, the coating applied to the coating roll is uniformly thinned, and the coating film of 10 nm to 300 nm thinness can be uniformly formed on the entire surface of the substrate. Further, since air is less likely to be accumulated in the groove, bubbles are less likely to accumulate, so that it is not easy to form a small hole or the like in the coating film applied to the substrate.

5. When the contact surface of the blade is engraved in an ultra-fine groove of a micrometer ( μm ) unit and a DLC film is formed on the surface of the blade, as in the case of using an engraving roll having a DLC film, the film is easily uniform in thickness. Film formation.

6. Since the doctor roll is an engraved film, the functional coating agent easily enters into the groove of the engraving and diffuses to the entire surface of the roll, and the functional coating agent applied to the applicator roll can be uniformly thinned. A functional coating film having a thinness of 10 nm to several 100 nm is uniformly formed on the entire surface of the substrate. Further, since air is less likely to be accumulated in the groove, bubbles are less likely to accumulate, so that it is not easy to form a small hole or the like in the coating film applied to the substrate.

7. Generally, rubber or nickel/chromium is used for the doctor roll. In addition to the high surface energy, the materials also have frictional heat generated by friction between the doctor roll and the coating roll or the temperature of the coating agent rises due to outside air temperature. Then, in the coating apparatus of the present invention, since the doctor roll having the functional DLC film is used, the surface energy of the doctor roll is lowered, the hydrophilicity is improved, and the friction between the doctor roll and the coating roll is reduced, and the coating agent is There is also less heat.

1‧‧‧guide roller

2‧‧‧Scraper roller

3‧‧‧Coating roller

4‧‧‧Support roller

5‧‧‧Substrate

6‧‧‧ paint

7‧‧‧ paint supply device

8‧‧‧Temperature Sensor

Fig. 1 is an explanatory view showing an example of a coating apparatus of the present invention.

Form for implementing the invention

Coating coating method for substrate and embodiment of coating coating device

The coating coating method and coating coating apparatus for a substrate of the present invention can be applied to substrates used in various fields. An example of the coating coating method and coating coating apparatus of the present invention will be described below.

As shown in FIG. 1, the coating apparatus of the present invention comprises a guide roller 1, a doctor roller 2, a coating roller 3, and a backup roller 4. In this coating apparatus, when the substrate 5 is transferred in the direction of the arrow (the left side of FIG. 1) by the rotation of the guide roller 1, and transferred to the upper side of the backup roll 4, the coating material 6 is coated with the coating roller 3. On top of the substrate 5.

In the coating method for the substrate of the present invention, the aforementioned coating device may be used, and other coating devices may be used. When the above coating apparatus is used, the coating apparatus can be used in an environment of normal temperature and atmospheric pressure.

The substrate may be a single piece separated piece by piece, or may be continuous. base The materials are made of glass, resin, carbon or metal. The substrate is a film, a sheet, a plate (panel), for example, a windshield of a solar generator, a panel for an optical system (image machine or office machine), a film, a lens, an organic EL film, an inorganic EL film. Display panels such as TVs, navigation devices, display panels for panels such as personal computers and mobile devices, protective panels for lighting fixtures, glass for building materials or optical equipment, semiconductor wafers, and protective panels for sensors. Films, sheets, plates, panels, etc. used in various fields.

The coating used in the present invention also differs depending on the use of the substrate after film formation, and can be a general-purpose anti-corrosive coating (including a functional anti-corrosive coating), a conductive coating, an insulating coating, a protective coating, a reinforced coating, and a UV light shading. Coatings, antistatic coatings, pigmented coatings, etc. A functional coating agent can also be used for the coating. The functional coating agent is water-soluble or organic solvent-soluble and less viscous. For example, a viscosity of, for example, 1.3 Pa·s or less is particularly suitable. Further, it is preferably a coating agent which can prevent dirt on the surface of the panel, is not easily damaged (excellent in weather resistance), is transparent, and is not easily transmitted by light (excellent light transmittance). Further, in order to improve the adhesion to the substrate to be formed, it is suitable to include a binder. For example, a transparent inorganic binder having a particle diameter of SiO _{2 of} 1 nm to 10 nm and having a content of 5% or less is suitable. The surface of all the substrates of glass, stainless steel (metal), resin, and the like is formed into fine irregularities that are invisible to the eye. By using a transparent inorganic binder containing cerium oxide having a particle diameter of 1 nm to 10 nm, the adhesion to the uneven surfaces can be improved. Further, a functional material such as photocatalyst titanium oxide or antistatic tin oxide which is not exposed on the surface of the substrate is easily exposed on the surface, and the properties of the functional coating agent are easily exhibited.

The aforementioned functional plating agent is suitably used as AS-LR COAT (liquid) of JAPAN NANO COAT Co., Ltd. AS-LR COAT contains cerium oxide as an inorganic binder, and the cohesive force (intermolecular force) of an inorganic oxide centered on cerium oxide suppresses the cohesive force simultaneously with the action of a solvent, thereby enabling A film having a high transparency and high adhesion is formed at room temperature. The functional coating agent has various characteristics such as antistatic, water stain prevention, anti-infrared, ultraviolet light, anti-reflection, low refraction, and noise.

In the coating method for the substrate of the present invention, the material of the substrate is also different. For example, in the case of a resin or the like, the primer may be applied to the surface of the substrate to form a film.

The coating 6 is supplied to either or both of the doctor roll 2 and the coating roll 3, or the doctor roll 2 and the application roll 3. The excess coating material adhering to the surface of the coating roller 3 is scraped off by the doctor blade 2 which has been rotated in the opposite direction to the coating roller 3, and is thinned, and the substrate 5 can be applied to a uniform thickness.

When the coating material 6 is applied to the substrate 5, the coating roller 3 is usually rotated in the same direction as the direction in which the substrate 5 is transferred (normal rotation), and the roller 3 may be moved in the opposite direction to the substrate 5 (reverse rotation) rotation. In order to make the film formation on the substrate 5 thin, reverse rotation is suitable. When it is rotated in the reverse direction, the rotational force of the coating roller 3 is made weaker than the transfer force of the substrate 5, and the substrate 5 can be smoothly transferred.

The rotation speed of the coating roller 3 is preferably one rotation or less during the period in which the substrate 5 passes under the coating roller 3, so that the coating applied to the substrate 5 does not have thickness unevenness. During the period in which the substrate 5 passes under the coating roller 3, when the coating roller 3 is rotated one or more times, uneven contact with the coating material of the substrate is likely to occur (the film thickness is not All).

A roller having a hydrophilic DLC film (amorphous carbon film) formed on the surface of the roll may be used in either or both of the doctor roll 2 and the applicator roll 3. By using the roller, the hydrophilic coating easily conforms to the DLC film, and the coating on the surface of the coating roller 3 is easy to expand the surface to a uniform thickness, and the coating is easy to form a uniform thickness on the surface of the substrate 5. The doctor blade 2 is provided with a hydrophilic DLC film having a hydrophilic DLC film on the surface of the engraving roll which is applied to the ultra-fine groove of the surface of the roll ( μm ) in various shapes such as a lattice shape, a spiral shape, a diagonal line shape, or a honeycomb shape. Film engraving roll. By using such a roller, the hydrophilic coating is easy to adhere to the surface of the roller, and the coating on the surface of the coating roller 3 is easily thinned to a uniform thickness on the entire surface, and the surface of the substrate 5 is easily formed into a uniform thickness. . Generally, the surface material of the doctor roll is subjected to rubber or nickel plating or chromium plating. The materials are highly water-repellent. When the paint is water-soluble, the groove pattern on the surface of the engraving roll is transferred to the base by the coating roller. In the case of materials, this is not the case in the present invention.

The viscosity (fluidity) of the coating of the present invention is also about the outside temperature. The coating roller is usually made of rubber. The rubber roller is heated by continuous operation for a long period of time. When the heat is applied, the coating is heated, the viscosity is increased, the fluidity is lowered, and it is difficult to form a film into a thin and uniform. In order to solve such problems, in the present invention, as shown in FIG. 1, it is preferable to provide a temperature adjustment function for the paint supply device (tank) 7, and to provide non-contact near the paint 6 supplied between the doctor roll 2 and the coating roll 3. The temperature sensor 8 is configured to operate the temperature adjustment function to cool the paint 6 in the paint supply device 7 while the temperature detected by the temperature sensor 8 is increased, and the paint 6 can be supplied to the doctor roll 2 and coated. Roller 3 or any of the rolls 2, 3. Moreover, the temperature adjustment function may not be provided in the paint supply device 7 in the scraper A temperature adjustment function is provided for either or both of the roller 2 and the coating roller 3. Specifically, a refrigerant passage is provided in the rolls 2 and 3, and a refrigerant such as water or gas is supplied to the refrigerant passage to be cooled. At this time, the non-contact temperature sensor 8 is disposed in the vicinity of either or both of the blade roller 2 and the coating roller 3, and the temperature of the rollers 2 and 3 is detected by the sensor 8 and can also be controlled. The operation of the temperature adjustment function of the paint supply device 7 is performed.

When the substrate 5 is not limited to a certain thickness, there is also a non-uniformity, and there is also a deformation or warpage. For example, even if the front panel of the solar light emitting electricity is the same specification, the thickness of the sheet is still 0.01 to 0.1 mm. Thus, since it is not easy to form a uniform thickness of the entire surface of the substrate in the substrate having the deviation, it is preferable to provide a thickness sensor above the substrate 5 which is transferred by the guide roller 1 as shown in FIG. 1 (for example). The laser displacement gauge), when compared with the substrate size based on the thickness of the sensor, is different from the substrate size, generates a warning, stops the transfer of the substrate 5, or automatically adjusts the blade roller 2 The height of both the coating roller 3 and the coating roller 3 can be manually adjusted to the interval between the doctor roll 2 and the coating roller 3, and the substrate 5 can be formed into a uniform thickness.

A method of forming a hydrophilic DLC film by forming a hydrophilic DLC film on the doctor blade 2 and the applicator roll 3 is a method of forming a hydrophilic DLC film which has been developed by the present inventors. The method is characterized in that a roller is arranged in a vacuum chamber, the chamber is at a normal temperature (preferably 20 ° C to 50 ° C) and is in a vacuum state, and a high frequency is supplied from the RF high frequency power source to the RF electrode in the chamber, and the roller is made. A plasma is generated around the periphery, and a high voltage pulse power source is applied from the high voltage pulse power supply in the chamber to the roller, and the surface of the substrate is cleaned by ion etching.

When the roller is a grooved roller (engraving roller), the groove is also cleaned during the aforementioned cleaning. After the cleaning, the raw material of DLC and O _{2 are} supplied into the vacuum chamber, and DLC (hydrophilic DLC) containing oxygen generated by reacting the raw material gas with O ₂ in a vacuum chamber is injected into the roller. The surface layer is formed by depositing hydrophilic DLC on the surface to form a hydrophilic DLC film.

In the film forming method, the Si-based gas containing at least O _{2 may} be supplied to the vacuum chamber before the formation of the hydrophilic DLC film, and the Si-based gas is decomposed and reacted in the vacuum chamber on the surface of the substrate. An O ₂ -containing layer is formed, and a hydrophilic DLC film is injected and deposited on the O ₂ -containing layer. At this time, hexamethyldioxane (HMDSO) can be used as the Si-based gas. Further, before the formation of the hydrophilic DLC film, the raw material gas of the DLC may be supplied into the vacuum chamber, and the DLC which is formed by reacting the raw material gas in the vacuum chamber may be injected into the surface of the substrate while not containing oxygen. The DLC film is deposited, and a hydrophilic DLC film is formed on the surface of the DLC film. At this time, a mixed layer for improving the adhesion between the substrate and the DLC film may be formed before the formation of the DLC film.

The roll formed by the film formation method described above has a hydrophilic DLC film formed by reacting a raw material gas having DLC on the surface of the cleaned substrate with O ₂ . The hydrophilic DLC film substrate may have an O ₂ -containing layer formed by decomposing and reacting an Si-based gas containing at least O ₂ between the substrate and the hydrophilic DLC film. The O ₂ -containing layer may also be formed by decomposition reaction of hexamethyldioxane (HMDSO). An oxygen-free DLC film formed by reacting a raw material gas of DLC may be provided between the substrate and the hydrophilic DLC film. A mixed layer for improving the adhesion between the substrate and the DLC film may be provided between the substrate and the DLC film. The roll may also be a rubber, SUS, aluminum roll, or a metal roll with a surface plated with Cr or Ni. The film thickness of the hydrophilic DLC film is preferably 0.2 to 5 μm . The hardness of the hydrophilic DLC film is preferably from 800 to 2500 HV.

In the coating for printing, in order to control the thickness of the coating film, a doctor roll or a doctor blade is used.

The doctor roll and the coating roll of the present invention can be made of various materials such as an aluminum roll, a carbon roll, a resin roll, a rubber roll, a CFRP roll (carbon fiber reinforced plastic roll), a metal roll, and a non-ferrous metal roll. Rolls of Cr (chromium) or Ni (nickel) are also applied to the surface of the metal roll.

The foregoing description is in the case of using a doctor roll, and in the present invention, a doctor blade may be used instead of the doctor roll. At this time, it is preferable to make the coating roller have a DLC film, and it is also possible to provide a cooling function of the refrigerant to the coating roller. Further, a doctor roll and a doctor blade can also be used in combination.

Industrial availability

In the present invention, as long as the above-mentioned problems can be solved, the substrate may be in a field other than the above-mentioned substrate, shape, or material. The film wound into a roll may be pulled out and wound into a roll shape to be coated. . The coating material may be other than the above-described coating material, and the doctor blade, the coating roller, the doctor blade, or the like may be other than the above embodiment.

1‧‧‧guide roller

2‧‧‧Scraper roller

3‧‧‧Coating roller

4‧‧‧Support roller

5‧‧‧Substrate

6‧‧‧ paint

7‧‧‧ paint supply device

8‧‧‧Temperature Sensor

Claims (1)

An engraving roll having a hydrophilic DLC film, which is a doctor roll having a coating film on a surface of a metal roll, wherein the doctor roll is engraved with an engraving roll having a super-fine groove of μm unit engraved on the surface thereof, and is engraved The surface of the roller has a hydrophilic DLC film.