JP2011212933A - Letterpress printing apparatus, manufacturing method for printed matter, and manufacturing method for organic el element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a letterpress printing apparatus with which the mixing of foreign objects in printed matter is reduced, and printing of a high quality is made possible by reducing the variation in an ink concentration on an anilox roll, and to provide a manufacturing method for printed matters.SOLUTION: The letterpress printing apparatus includes: an ink feeding apparatus which feeds an ink to the anilox roll under a non-contact state; a washing liquid feeding unit which feeds a washing liquid onto the surface of the anilox roll as an anilox roll washing apparatus; an air blower unit which jets a pressurized gas to the anilox roll after the washing liquid has been fed; and a washing liquid recovery unit which receives the washing liquid having been fed onto the surface of the anilox roll.

Description

  The present invention relates to a relief printing apparatus that can form a fine pattern on a printing medium uniformly in a plane with high positional accuracy using a relief printing method or a resin relief printing, and that can be continuously and stably formed. Also, for example, high-definition patterns such as patterns in color filters for liquid crystal displays (LCD), light-emitting layers and charge transport layers of organic electroluminescence (EL) elements, electrode patterns on organic thin-film transistor (TFT) substrates, and shield patterns in electromagnetic wave shields The present invention relates to a relief printing apparatus suitable for pattern formation.

  Conventionally, a photolithography method has been mainly used as a method for forming a fine pattern on a printing medium with a uniform in-plane and high positional accuracy by a wet process, and forming it continuously and stably. However, this photolithography method has a problem that the process is complicated, the manufacturing equipment necessary for pattern formation is expensive, and the material is wasted, resulting in high manufacturing cost.

  Further, as a patterning method other than the photolithography method, printing methods such as offset printing and letterpress printing, and ink jet methods are actually attempted to form a thin film pattern such as a light emitting layer formation of an organic EL element (prior art documents 1 and 2). ). In particular, the relief printing method is considered advantageous in terms of patterning accuracy with a thin film.

An example of a conventional relief printing apparatus will be described with reference to FIG.
In the relief printing apparatus of FIG. 7, a relief plate 704 having a convex pattern corresponding to the print pattern, a rotary plate cylinder 705 on which the relief plate 704 is mounted via a block cushion 703, and ink on the plate surface of the relief plate 704 are used. An anilox roll 701 for supplying ink, an ink chamber 708 for supplying ink to the anilox roll 701, a doctor blade 702 for scraping off excess ink on the anilox roll, and a substrate surface plate on which a substrate to be printed 707 is placed 706. Printing is completed by rotating the plate cylinder and transferring the ink on the relief plate to the substrate to be printed.

  In the conventional relief printing apparatus as described above, as shown in FIG. 8, after the ink is supplied from the ink chamber 708 to the anilox roll 701, the doctor blade 702 uniformly distributes the ink supplied from the anilox roll to the plate to some extent. In order to do this, excess ink on the anilox roll surface 701A is scraped off. In this way, the amount of ink held by the anilox roll is adjusted.

  However, anilox rolls and doctor blades are often made of metal from the viewpoint of accuracy and durability, and both are always in contact in the printing process, so the blade or anilox roll surface is gradually scraped to generate foreign matter. If it is printed on paper, it will not be a big problem. However, in the case of electronic parts such as semiconductors and color filters, the product may be defective due to scraped foreign matter, or if the foreign matter is metal, it will cause a short circuit due to electrical conduction. Will occur.

  On the other hand, as a letterpress printing method that does not use an anilox roll and a doctor blade, a printing apparatus that forms an ink coating on a solid roll and supplies the ink coating to the letterpress has been tried (Patent Document 3). However, in the case of a solid roll, since there is no control of the film thickness by the anilox roll as described above, it is difficult to control the film thickness of the ink transferred to the substrate to be printed, and electronics that require high film thickness accuracy and uniformity. Manufacturing parts was difficult.

  Furthermore, in order to prevent the ink on the anilox roll from drying out, the ink is stored in the ink chamber and rotated to immerse a part of the anilox roll, so that it may have a role of ink application and drying prevention. However, in this method, there is a problem that the ink is exposed to the air in a large area, the ink is easily oxidized, and the dried foreign matter is generated.

  From the background described above, an anilox roll is indispensable for supplying ink onto the relief printing plate.However, if a doctor blade is not used, excess ink will not be scraped off, so that the ink will remain on the anilox roll. As a result, the film thickness increases, and the ink density varies between cells of the anilox roll, resulting in a decrease in print quality.

JP 2001-93668 A JP 2001-155858 A JP 2008-296547 A

In view of the above problems, the present invention provides a relief printing apparatus capable of performing high-quality printing by reducing the variation in the ink concentration on the anilox roll and the production of the printed material with less contamination of foreign matter in the printed material. Provide a method.

The invention according to claim 1 to solve the above-mentioned problems is a relief printing apparatus using a relief printing plate as a printing plate, on which a rotary plate cylinder on which the relief plate is installed, and a substrate to be printed are placed. An anilox roll comprising: a substrate surface plate; an anilox roll that supplies ink to the relief plate; an ink supply device that supplies ink to the anilox roll in a non-contact manner; and an anilox roll cleaning device that cleans the surface of the anilox roll. The cleaning device includes a cleaning liquid supply unit that supplies a cleaning liquid to the surface of the anilox roll, a blower unit that injects a pressurized gas to the anilox roll after the cleaning liquid is supplied, and a supply to the surface of the anilox roll. And a cleaning liquid recovery unit that receives the cleaned cleaning liquid. .
The invention according to claim 2 is the relief printing apparatus according to claim 1, wherein the cleaning liquid supply unit includes a nozzle for injecting the cleaning liquid onto the anilox roll surface.
The invention according to claim 3 is the relief printing apparatus according to claim 1 or 2, wherein the cleaning liquid is a volatile organic solvent. Note that the volatile organic solvent means that it can be volatilized in the atmospheric state and no residue remains when volatilized.

According to a fourth aspect of the present invention, the cleaning liquid supply unit has a cleaning liquid injection nozzle that injects the cleaning liquid onto the surface of the anilox roll, and the blower unit is added to the anilox roll after the cleaning liquid is injected. A gas injection nozzle for injecting pressurized gas, wherein the cleaning liquid injection nozzle, the gas injection nozzle and the cleaning liquid recovery unit are accommodated in a cover, and a portion of the cover corresponding to the outer peripheral curved surface of the plate cylinder is the anilox roll 4. The relief printing apparatus according to claim 1, wherein the cover is formed in a curved surface shape corresponding to the outer peripheral curved surface, and only the curved surface portion of the cover is open. 5.
The invention according to claim 5 is characterized in that the cleaning liquid supply nozzle and the gas injection nozzle are arranged back and forth in the rotational direction of the plate cylinder so as to face the opening of the curved surface portion. Item 4. The relief printing apparatus according to Item 4.
According to a sixth aspect of the present invention, a nozzle that injects the cleaning liquid from the cleaning liquid supply unit onto the surface of the anilox roll and a pressurized gas from the blower unit are injected into the anilox roll after the cleaning liquid is supplied. 6. The nozzle according to claim 1, wherein the nozzle is configured as a single nozzle, and the cleaning liquid and the pressurized gas are switched from the nozzle and sprayed onto the anilox roll. The letterpress printing apparatus described.
The invention according to claim 7 is a method for producing a printed matter, which includes a step of transferring an ink coating film on an anilox roll to a relief plate, and a step of transferring the ink coating film on the relief plate to a printing substrate. A step of applying ink onto the anilox roll as the anilox roll rotates, a step of transferring ink from the anilox roll to the relief plate, a step of removing ink remaining on the anilox roll, and It is a manufacturing method of the printed matter which has.
The invention according to claim 8 is characterized in that the step of removing ink remaining on the anilox roll includes a step of supplying a cleaning liquid to the anilox roll and a step of removing the cleaning liquid from the anilox roll. It is a manufacturing method of the printed matter according to claim 7.
The invention according to claim 9 is characterized in that the cleaning liquid is a volatile organic solvent, and the step of removing the cleaning liquid from the anilox roll is removal of the cleaning liquid by injection of pressurized gas. It is a manufacturing method of the printed matter according to claim 7 or 8.
The invention according to claim 10 is a method of manufacturing an organic EL element having at least an organic light emitting layer between a cathode layer and an anode layer, wherein the organic light emitting layer is any one of claims 7 to 8. It forms using the manufacturing method of the printed matter of 1 item | term, It is a manufacturing method of the organic EL element characterized by the above-mentioned.

  According to the relief printing apparatus of the present invention, an ink film is directly formed on an anilox roll by using a coating apparatus and transferred to the relief printing, and by transferring this, printing with less foreign matter becomes possible, and further to the relief printing plate. Anilox roll cleaning is performed for each transfer, and from the discharge of the cleaning liquid to the removal and collection of the cleaning liquid can be performed in a non-contact manner in the cleaning process, so that high-quality printing is possible.

It is a schematic diagram showing the example of 1 structure of the relief printing apparatus which concerns on this invention. It is a schematic diagram of the anilox roll surface for demonstrating this invention. It is a schematic diagram of the anilox roll surface for demonstrating this invention. It is a schematic diagram showing the example of 1 structure of the washing | cleaning mechanism which concerns on this invention. It is a schematic diagram showing the example of 1 structure of the washing | cleaning mechanism which concerns on this invention. It is a schematic diagram showing the example of 1 structure of the organic EL element concerning this invention. It is a schematic diagram showing the example of 1 structure of the conventional relief printing apparatus. It is a schematic diagram of the anilox roll surface for demonstrating a prior art.

<Letterpress printing device>
FIG. 1 is a schematic diagram of a configuration example of a relief printing apparatus according to the present invention.
The relief printing apparatus according to the present embodiment includes a substrate platen 106 on which a printing substrate is placed, a relief plate 104 that transfers ink to the printing substrate 107, and a rotation in which the relief plate 104 is mounted directly or with a cushion 103 interposed therebetween. A plate cylinder 105, a surface plate 106 for transporting the printing substrate 107, an anilox roll 101 for transferring ink to the relief plate 104, and a coating device 102 for applying ink to the anilox roll surface are provided. The form of the printing press is not limited to the configuration shown in FIG. For example, a method in which the substrate surface plate moves under the plate cylinder may be adopted, or a method in which the plate cylinder moves over the substrate surface plate may be employed. The coating apparatus 102 may be any system as long as it is non-contact and quantitative.

  The relief printing apparatus of the present invention further includes a cleaning mechanism 114 for the anilox roll 101. The cleaning mechanism 114 dry-removes the cleaning liquid from the anilox roll surface, the cleaning liquid supply unit 116 that supplies at least the cleaning liquid to the anilox roll surface, the cleaning liquid recovery unit 117 that recovers the cleaning liquid supplied to the anilox roll surface without scattering. A blower unit 115 is included.

  The coating apparatus 102 according to the relief printing apparatus of the present invention is preferably capable of uniformly forming a coating film on an anilox roll, and is different from a conventional ink chamber in that the film thickness is controlled. Specific examples of such a coating apparatus include a slit coater. The coating nozzle for discharging the ink of the slit coater is arranged so as to be parallel to the rotation axis of the anilox roll 101 and to face the anilox roll surface, and an ink coating film can be formed on the anilox roll surface 101A. A metering pump 108 is connected between the ink tank 109 and the coating apparatus. A controller (not shown) connected to the metering pump 108 controls the anilox roll 101 so that the metering pump 108 delivers ink of a specified film thickness at a coating rate that matches the rotation speed of the anilox roll 101. Coating is performed by synchronizing the pump with the rotation speed and controlling the amount of ink discharged from the coating head. With such a configuration, it is possible to accurately feed a specified film thickness for each printing.

  In the coating device 102, a closed system is used so that the ink does not touch the air except for the ink discharge portion (for example, the tip of the coating nozzle of the slit coater), and nitrogen is also used when the ink is pressurized and supplied to the pump. Is preferred. When the printed body is an electronic device, deterioration of the ink containing the organic functional material becomes a problem. By blocking the air in this way, stable coating can be performed without deteriorating the ink characteristics.

  As the anilox roll 101, a known general anilox roll can be used. By selecting the number of mesh lines of the anilox roll and the cell volume (groove volume) of the mesh, it is possible to control the amount of ink supplied to the relief plate, and hence the amount of ink transferred to the substrate to be printed. The surface 101A of the anilox roll can be subjected to chromium plating to reduce ink adhesion and deposition after cleaning.

  When ink is supplied to the anilox roll 101 without using a doctor blade, the ink is applied from the coating apparatus 102 in a state where the viscosity is lower than that in the past in order to uniformly form a coating film on the anilox roll 101. It is preferable. On the other hand, when the ink is transferred from the anilox roll 101 to the relief plate 104, a certain degree of viscosity is required so that the ink does not flow into the depression of the relief plate. Specifically, assuming that the viscosity of the ink when supplying the ink to the anilox roll is less than 15 mPa · s, a viscosity larger than that is suitable for transferring onto the relief plate, and is 40 mPa · s or more. It is preferable.

  Such an ink concentration can be adjusted by partially volatilizing the ink solvent. In particular, when the ink solvent is a highly volatile organic solvent, the concentration can be gradually increased by volatilization of the solvent component even at atmospheric pressure and room temperature. Therefore, ink suitable for letterpress printing by means of natural volatilization using the time from the ink application to the anilox roll until the ink is transferred to the letterpress, or by means of volatilizing the ink solvent such as blowing or heating using a blower The ink density can be made to have a viscosity. Further, as shown in FIG. 2, the thickness of the ink coating 320B at the stage of transferring the ink from the thickness of the ink coating 320A (FIG. 2A) when the ink is applied to the anilox roll to the letterpress plate ( By changing the film thickness of the ink coating on the anilox roll surface 101A up to FIG. 2B), an appropriate amount of ink is transferred to the relief.

  Here, when printing is performed continuously, the above-described ink density change becomes a problem. That is, after the plate cylinder 105 on which the relief plate 104 is installed and the anilox roll 101 are rotated synchronously, the ink is transferred to the relief plate 104, and then the ink is applied from the coating device 102 to the area of the same anilox roll surface. Since the density of the remaining ink is high, the ink density varies (FIG. 2C).

  Therefore, in the method for producing a printed matter according to the present invention, this problem is obtained by providing a step of cleaning the anilox roll between the step of transferring the ink to the relief plate 104 and the step of supplying the ink onto the anilox roll again. Has solved. That is, a cycle of supplying ink onto the anilox roll (FIG. 3A), transferring ink to the relief plate (FIG. 3B), removing ink on the anilox roll surface 101A (FIG. 3C), and supplying ink onto the anilox roll (FIG. 3A). Thus, the ink state is maintained properly.

  FIG. 4 is a schematic view of the anilox roll cleaning mechanism 114 portion of the relief printing apparatus according to the present invention shown in FIG. In the cleaning mechanism 114 in the embodiment of FIG. 4, the anilox roll and the ink supply device 102 face each other after the position where the anilox roll 101 and the letterpress come into contact with the rotation direction of the anilox roll (the arrow in the figure). It is installed in the area before the position.

  As shown in FIG. 4, the cleaning liquid supply unit 116 has a cleaning liquid injection nozzle 116a for injecting the cleaning liquid onto the surface of the anilox roll 101, and this cleaning liquid injection nozzle is connected to a cleaning liquid tank (not shown) by a cleaning liquid supply hose 116b. ing. As the cleaning liquid for cleaning the anilox roll, a volatile organic solvent having solubility in the ink medium is preferable. This is because if water or a detergent is mixed, the ink characteristics may be adversely affected if it remains on the anilox roll surface. Further, by using a volatile organic solvent, it is possible to remove the cleaning liquid from the anilox roll 101 without leaving the cleaning liquid by blowing a gas by the blower unit 115 as described later. In particular, an organic solvent that is the same organic solvent as the ink solvent or an organic solvent in which one or several of the organic solvents included in the ink solvent are easily mixed is suitable so as not to adversely affect the characteristics of the ink.

  As the form of the cleaning liquid injection nozzle 116, the form in which the anilox roll 101 is arranged in parallel in the width direction (direction parallel to the rotation axis), the form in which the cleaning liquid injection nozzle moves in the width direction of the anilox roll, the width of the anilox roll A slit nozzle configuration that can supply the cleaning liquid uniformly in the direction is conceivable. Moreover, in order to scrape out the ink residue accumulated in the recess (cell) of the anilox roll, a two-fluid nozzle that ejects the cleaning liquid together with the pressurized gas may be used. Similarly, the cleaning liquid spray nozzle 116 ejects ink residue accumulated in the recesses of the anilox roll, so that the cleaning liquid spray nozzle 116 is efficiently arranged at an angle perpendicular to the anilox roll surface or inclined downward.

  Next, the blower unit 115 removes the cleaning liquid on the anilox roll 101 by blowing or volatilizing it by the cleaning liquid supply unit 116. According to the embodiment shown in FIG. 4, the gas injection nozzle 115a for injecting pressurized gas onto the surface of the anilox roll supplied with the cleaning liquid is provided, and this gas injection nozzle is connected to the pressurized gas supply hose 115b for pressurization. Pressurized gas is supplied from the gas supply hose. The pressurized gas used is preferably air or an inert gas such as nitrogen or a rare gas. In the form of FIG. 4, in order to remove the cleaning liquid after the cleaning liquid is supplied onto the anilox roll, the gas injection nozzle is moved to the anilox roll 101 by the coating apparatus 102 in the rotation direction of the anilox roll. It is arranged at a position closer to the application position.

  As another form of the present invention, as in the anilox roll cleaning mechanism shown in FIG. 5, a nozzle that injects the cleaning liquid onto the surface of the anilox roll 101, and a pressurized gas is injected into the anilox roll after the cleaning liquid is supplied. The nozzle may be a single common nozzle 121, and the cleaning liquid supply hose 116b and the pressurized gas supply hose 115b may be connected to the common nozzle. You may comprise so that a washing | cleaning liquid and the pressurized gas may be switched and sprayed to an anilox roll from the said common nozzle. In this case, after spraying the cleaning liquid from the common nozzle, when spraying the pressurized gas for drying, the droplets of cleaning liquid remaining on the tip of the common nozzle are blown simultaneously, so that the cleaning liquid dripping from the tip of the common nozzle to the anilox roll Prevents the occurrence of uneven cleaning due to

  Next, as shown in FIGS. 1 and 4, the cleaning liquid recovery unit 117 has a cleaning liquid recovery tray 119 and a suction port 118 communicating with the bottom of the tray 119, and this suction port is connected to a suction hose. The cleaning liquid is collected.

  The anilox roll cleaning mechanism 114 according to the present invention has a cleaning mechanism cover 120 that accommodates a cleaning liquid injection nozzle and a gas injection nozzle or a common nozzle and a tray 119, and a portion of the cover 120 corresponding to the outer peripheral curved surface of the anilox roll 101 is The anilox roll 101 is formed in a curved surface shape corresponding to the outer curved surface, and the curved surface portion 120A of the cleaning mechanism cover 120 is opened. Since the cleaning mechanism cover 120 covers the nozzles of the blower unit and the cleaning liquid supply unit and the cleaning liquid recovery unit 117, it is possible to perform the cleaning process without splashing the cleaning liquid and to prevent foreign substances from entering. The gap between the outer peripheral curved surface of the anilox roll 101 and the curved surface-shaped portion 120A is preferably 5 mm or less. Further, as shown in FIG. 4, the cleaning liquid supply nozzle and the gas injection nozzle are arranged back and forth in the rotation direction of the anilox roll 1 so as to face the opening of the curved portion.

  According to the relief printing apparatus of the present invention, in the anilox roll cleaning step, it can be performed in a non-contact manner from the discharge of the cleaning liquid to the removal and recovery of the cleaning liquid, so that the anilox roll 101 can be cleaned without being damaged, In letterpress printing, film thickness instability due to ink remaining on the anilox roll during continuous printing and density variation between anilox roll cells are eliminated, and good printing is possible immediately after washing.

<Method for producing printed matter>
Next, a method for producing a printed material according to the present invention will be described with reference to FIG.
First, as an ink supply process to the anilox roll 101, an ink coating film is formed on the anilox roll surface. As described above, by synchronizing the rotation speed of the anilox roll 101 and the amount of ink discharged from the coating apparatus, it is possible to control the film thickness on the anilox roll surface to form an ink coating film.

  Next, in the transfer step of transferring the ink from the anilox roll 101 to the relief plate 104, the rotation speed and the ink transfer (in a range corresponding to the relief pattern area formed on the relief plate are synchronized with the rotation speed of the plate cylinder 105 provided with the relief plate. Primary transfer) is performed. At the same time, the plate cylinder and the surface plate 106 on which the printing substrate 107 is placed are synchronized, and the printing plate 107 is brought into contact with the printing plate 107 and rotated to move the ink pattern corresponding to the relief pattern onto the printing substrate. (Next transfer) and printing is completed once. As described above, a drying step for adjusting the state of the ink coating film may be provided before transferring to the relief printing plate.

  Next, the anilox roll 101 is further rotated, and the area where the ink on the anilox roll surface remains is moved to the cleaning mechanism 114. At this time, printing may be performed continuously with the anilox roll and the plate cylinder synchronized, or cleaning may be performed by rotating only the anilox roll asynchronously.

  Next, the anilox roll 101 is further rotated, and the cleaning of the anilox roll is completed from the coating device to the point where the ink coating film is formed on the anilox roll surface. The ink and the cleaning liquid are completely removed from the anilox roll surface. In this state, new ink can be applied.

  This completes one printing process. Since the ink is removed from the anilox roll each time and the film thickness is maintained without a doctor blade, it is possible to produce a high-quality printed material that retains printing characteristics even during repeated printing.

<Method for producing organic EL element>
An embodiment in which the printed matter manufacturing method of the present invention is applied to an organic EL element will be described with reference to FIG. There are a passive matrix type and an active matrix type as a driving method of the organic EL element, but the organic EL element of the present invention can be applied to both a passive matrix type organic EL element and an active matrix type organic EL element. .

  The passive matrix method is a method in which stripe-shaped electrodes are opposed to each other so as to be orthogonal to each other, and light is emitted at the intersection, whereas the active matrix method uses a so-called thin film transistor (TFT) substrate in which a transistor is formed for each pixel. Thus, the light is emitted independently for each pixel.

  When the organic EL element is a bottom emission type organic EL element that extracts light from the substrate side, it is necessary to use a transparent substrate, but in the case of the top emission type that extracts light from the opposite side of the substrate The substrate need not be translucent.

  As the substrate 501, a glass substrate or a plastic film or sheet can be used. If a plastic film is used, a polymer EL element can be produced by winding, and a display panel can be provided at a low cost. In addition, as the plastic in that case, for example, polyethylene terephthalate, polypropylene, cycloolefin polymer, polyamide, polyethersulfone, polymethyl methacrylate, polycarbonate, or the like can be used. Further, these films are barrier layers made of metal oxide such as silicon oxide showing water vapor barrier property and oxygen barrier property, oxynitride such as silicon nitride, polyvinylidene chloride, polyvinyl chloride, saponified ethylene-vinyl acetate copolymer. Is provided as necessary.

A pixel electrode 2 patterned as an anode is provided on the substrate 501. As a material of the pixel electrode 502, transparent electrode materials such as ITO (indium tin composite oxide), IZO (indium zinc composite oxide), tin oxide, zinc oxide, indium oxide, and aluminum oxide composite oxide can be used. ITO is preferred because of its low resistance, solvent resistance, transparency, and the like. ITO is formed on the substrate by sputtering and patterned by photolithography to form line-shaped pixel electrodes 502.
Then, after forming the line-shaped pixel electrode 2, an insulating layer 503 is formed by a photolithography method using a photosensitive material between adjacent pixel electrodes.

  The insulating layer 503 in this embodiment preferably has a thickness in the range of 0.5 μm to 5.0 μm. In addition, by providing an insulating layer between adjacent pixel electrodes, the spread of the hole transport ink printed on each pixel electrode is suppressed, and leaks due to the presence of the hole transport layer on the insulating layer when a display is made. Generation of current can be prevented. If the insulating layer is too low, ink spreading cannot be prevented and a hole transport layer is formed on the insulating layer.

  For example, in an organic EL element of a passive matrix type, when an insulating layer is provided between pixel electrodes, the cathode layer is formed by directing the insulating layer. When the cathode layer is formed so as to straddle the insulating layer in this way, if the insulating layer is too high, the cathode layer is disconnected, resulting in a display defect. When the height of the insulating layer exceeds 5.0 μm, disconnection of the cathode tends to occur.

  In addition, the photosensitive material for forming the insulating layer 503 may be either a positive resist or a negative resist, and may be a commercially available one, but it must have insulating properties. Note that if the partition does not have sufficient insulation, a current flows to the adjacent pixel electrode through the partition and a display defect occurs. Specific examples thereof include polyimide, acrylic resin, novolac resin, and fluorene, but are not limited thereto. Further, for the purpose of improving the display quality of the organic EL element, a light shielding material may be included in the photosensitive material.

  The photosensitive resin for forming the insulating layer 503 is applied using a coating method such as a spin coater, a bar coater, a roll coater, a die coater, or a gravure coater, and is patterned by a photolithography method. Alternatively, the insulating layer may be formed using a gravure offset printing method, a reverse printing method, a relief printing method, or the like without using a photosensitive resin.

  After the insulating layer 503 is formed as described above, the hole transport layer 504 is formed next. Examples of the hole transport material forming the hole transport layer 4 include polyaniline derivatives, polythiophene derivatives, polyvinylcarbazole (PVK) derivatives, poly (3,4-ethylenedioxythiophene) (PEDOT), and the like. These materials are dissolved or dispersed in a solvent to form a hole transport material ink, which can be formed using the relief printing method according to the present embodiment.

  Examples of the solvent for dissolving or dispersing the hole transport material include toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methanol, ethanol, isopropanol, ethylene glycol, propylene glycol, polyethylene glycol, glycerin, and ethyl acetate. , Butyl acetate, isopropyl acetate, methyl cellosolve, ethyl cellosolve, methyl cellosolve, ethyl cellosolve, butyl cellosolve, ethyl lactate, ethylene glycol diethyl ether, 1-propanol, methoxypropanol, ethoxypropanol, water, etc. Etc. Moreover, surfactant, antioxidant, a viscosity modifier, a ultraviolet absorber, etc. may be added as needed.

  The solid content concentration of the hole transport layer ink is preferably 0.5 to 4.0%. This is because, in the hole transport ink used in the present embodiment, when the concentration is 4.0% or more, the stability of the ink is deteriorated, which causes ink aggregation and unevenness of the hole transport layer.

Note that an inorganic material may be used for the hole transport layer 504, and examples of the inorganic material include Cu ₂ O, Cr ₂ O ₃ , Mn ₂ O ₃ , FeOx (x to 0.1), NiO, CoO, and Pr _2. O ₃ , Ag ₂ O, MoO ₂ , Bi ₂ O ₃ , ZnO, TiO ₂ , SnO ₂ , ThO ₂ , V ₂ O ₅ , Nb ₂ O ₅ , Ta ₂ O ₅ , MoO ₃ , WO ₃ , MnO _2, etc. These transition metal oxides and inorganic compounds containing one or more of these nitrides and sulfides can be used. As a method for forming the inorganic material hole transport layer, depending on the material, a dry film forming method such as a resistance heating vapor deposition method, an electron beam vapor deposition method, a reactive vapor deposition method, an ion plating method, a sputtering method, or a spin coating method is used. An existing film formation method such as a wet film formation method such as a sol-gel method can be used.

  Next, after forming the hole transport layer 504 as described above, the organic light emitting layer 5 is formed. The organic light emitting layer is a layer that emits light by passing an electric current. The organic light emitting material forming the organic light emitting layer is, for example, a coumarin type, a perylene type, a pyran type, an anthrone type, a porphyrene type, a quinacridone type, N, N ′. -A dialkyl-substituted quinacridone-based, naphthalimide-based, N, N'-diaryl-substituted pyrrolopyrrole-based, iridium complex-based luminescent dye dispersed in a polymer such as polystyrene, polymethylmethacrylate, polyvinylcarbazole, Examples thereof include polyarylene-based, polyarylene vinylene-based, and polyfluorene-based polymer materials.

  These organic light emitting materials are dissolved or stably dispersed in a solvent to form an organic light emitting ink. Examples of the solvent for dissolving or dispersing the organic light-emitting material include toluene, xylene, acetone, anisole, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, or a mixed solvent thereof. Among these, aromatic organic solvents such as toluene, xylene, and anisole are preferable from the viewpoint of solubility of the organic light emitting material. Moreover, surfactant, antioxidant, a viscosity modifier, a ultraviolet absorber, etc. may be added to organic luminescent ink as needed.

  As a method for forming the organic light emitting layer 505, when using a letterpress printing method, a resin letterpress suitable for organic light emitting ink can be used, and among these, a water developing type photosensitive resin letterpress is preferable. As shown in FIG. 5, for example, when the organic light emitting layer is applied in multiple colors so as to correspond to the RGB emission colors, the manufacturing method of the present invention capable of forming a high-definition pattern is suitable.

  Next, after forming the organic light emitting layer 505 as described above, the cathode layer 506 is formed in a line pattern orthogonal to the line pattern of the pixel electrode. As the material of the cathode layer 506, a material according to the light emitting characteristics of the organic light emitting layer can be used. For example, a simple metal such as lithium, magnesium, calcium, ytterbium, and aluminum or a stable metal such as gold and silver can be used. And alloys thereof. Alternatively, a conductive oxide such as indium, zinc, or tin can be used. Examples of the method for forming the cathode layer include a method using a vacuum vapor deposition method using a mask.

  Note that the organic EL element of the present embodiment has a structure in which a hole transport layer and an organic light emitting layer are laminated from the anode layer side between a pixel electrode that is an anode and a cathode layer. The organic light emitting layer which contributes to light emission should just be provided in between. In addition to the hole transport layer and the organic light emitting layer, a laminated structure in which a light emitting medium layer such as a hole blocking layer, an electron transport layer, and an electron injection layer is selected as necessary can be formed between the anode layer and the cathode layer. The formation method of the present invention can also be used when forming these layers.

  Finally, in order to protect these organic EL constituents from external oxygen and moisture, an organic EL element can be obtained by hermetically sealing with a glass cap 507 and an adhesive 508. In the case where the substrate has flexibility, sealing may be performed using a sealing agent and a flexible film.

  As described above, an example in which the method for producing a printed material according to the present invention is applied to the formation of an organic light emitting layer and a light emitting medium layer in an organic EL element is shown as an example of a printed body. (LCD) color filters, organic electroluminescence (EL) element light emitting layer and charge transport layer, organic thin film transistor (TFT) substrate electrode pattern and semiconductor layer pattern, electromagnetic shielding shield pattern, etc. When forming a thin film pattern, the method for producing a printed material of the present invention is suitable.

DESCRIPTION OF SYMBOLS 101: Anilox roll 102: Coating apparatus 103: Under-cushion cushion 104: Letterpress 105: Plate cylinder 106: Substrate surface plate 107: Substrate to be printed 108: Metering pump 109: Ink tank 110: Ink collection unit 111: Collection tank 114: Anilox roll cleaning mechanism 115: blower unit 115a: gas injection nozzle 115b: pressurized gas supply hose 116: cleaning liquid supply unit 116a: cleaning liquid supply nozzle 116b: cleaning liquid supply hose 117: cleaning liquid recovery unit 118: suction unit 118a: suction port 118b: Suction hose 119: saucer 120: cleaning mechanism cover 121: common nozzle 320A: ink coating (immediately after coating by the coating device)
320B: Ink coating film (immediately before transfer to a relief)
501: Substrate 502: Pixel electrode 503: Insulating layer 504: Hole transport layer 505R, 505G, 505B: Organic light emitting layer 506: Counter electrode 507: Glass cap 508: Adhesive 701: Anilox roll 701A: Anilox roll surface 702: Doctor Blade 703: Under-cushion cushion 704: Letterpress 705: Plate cylinder 706: Substrate surface plate 707: Printed substrate 708: Ink chamber

Claims (10)

A letterpress printing apparatus using a letterpress as a printing plate,
A rotary plate cylinder on which the relief plate is installed;
A substrate surface plate on which a substrate to be printed is placed;
An anilox roll for supplying ink to the letterpress,
An ink supply device for supplying ink in a non-contact manner to the anilox roll;
An anilox roll cleaning device for cleaning the surface of the anilox roll,
The anilox roll cleaning device includes a cleaning liquid supply unit that supplies a cleaning liquid to the surface of the anilox roll;
A blower unit for injecting a pressurized gas to the anilox roll after the cleaning liquid is supplied;
A cleaning liquid recovery unit that receives the cleaning liquid supplied to the surface of the anilox roll;
A letterpress printing apparatus comprising: 2. The relief printing apparatus according to claim 1, wherein the cleaning liquid supply unit includes a nozzle for injecting the cleaning liquid onto the anilox roll surface. The relief printing apparatus according to claim 1 or 2, wherein the cleaning liquid is a volatile organic solvent.   The cleaning liquid supply unit has a cleaning liquid injection nozzle that injects the cleaning liquid onto the surface of the anilox roll, and the blower unit has a gas injection nozzle that injects a pressurized gas to the anilox roll after the cleaning liquid is injected. The cleaning liquid injection nozzle, the gas injection nozzle and the cleaning liquid recovery unit are accommodated in a cover, and a portion of the cover corresponding to the outer peripheral curved surface of the plate cylinder is formed in a curved shape corresponding to the outer peripheral curved surface of the anilox roll. 4. The relief printing apparatus according to claim 1, wherein only the curved surface portion of the cover is open.   5. The relief printing apparatus according to claim 4, wherein the cleaning liquid supply nozzle and the gas injection nozzle are arranged back and forth in the rotation direction of the plate cylinder so as to face the opening of the curved surface portion.   The nozzle for injecting the cleaning liquid from the cleaning liquid supply unit to the surface of the anilox roll and the nozzle for injecting the pressurized gas from the blower unit to the anilox roll after the cleaning liquid is supplied are configured as a single nozzle. The relief printing apparatus according to any one of claims 1 to 5, wherein the cleaning liquid and the pressurized gas are switched from the nozzle and sprayed to the anilox roll. A method for producing a printed material comprising a step of transferring an ink coating film on an anilox roll to a relief plate, and a step of transferring the ink coating film on the relief plate to a substrate to be printed,
As the anilox roll rotates,
Applying ink onto the anilox roll;
Next, a step of transferring ink from the anilox roll to the relief plate,
Next, removing the ink remaining on the anilox roll,
A method for producing printed matter having Removing the ink remaining on the anilox roll,
Supplying cleaning liquid to the anilox roll;
Removing the cleaning liquid from the anilox roll;
The method for producing a printed matter according to claim 7, comprising: The cleaning liquid is a volatile organic solvent,
The method for producing a printed matter according to claim 7 or 8, wherein the step of removing the cleaning liquid from the anilox roll is removal of the cleaning liquid by jetting a pressurized gas.   10. A method for producing an organic EL device comprising at least an organic light emitting layer between a cathode layer and an anode layer, wherein the organic light emitting layer comprises the method for producing a printed material according to claim 7. A method for producing an organic EL element, characterized by being formed by using.

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