JP4665586B2 - Blanket mounting mechanism, offset printing apparatus and organic EL element manufacturing method using the same - Google Patents

Description

  The present invention relates to an organic EL device using, for example, an electroluminescence (hereinafter simply referred to as EL) phenomenon of an organic thin film, particularly an organic EL device in which an organic light emitting material constituting an organic light emitting layer is a polymer material. The present invention relates to a printing apparatus and a printing method suitable for high-definition pattern printing on a substrate by dissolving or dispersing them in a solvent, forming an ink, and a blanket and a blanket mounting mechanism therefor.

  The organic EL element has a structure in which a transparent conductive layer, an organic light emitting medium layer having an organic light emitting layer, and a cathode layer are sequentially laminated on a light transmitting substrate, and a current is passed through the organic light emitting layer in the organic light emitting medium layer. Is a self-luminous element.

  Typical examples of the organic light emitting medium layer include copper phthalocyanine for the hole injection layer and N, N′-di (1-naphthyl) -N, N′-diphenyl-1,1′-biphenyl for the hole transport layer. Examples include -4,4'-diamine and those using tris (8-quinolinol) aluminum for the organic light emitting layer. These organic light emitting medium layers are all low molecular materials, and each layer is laminated with a thickness of about 10 to 100 nm by a vacuum deposition method such as a resistance heating method. For this reason, in order to manufacture an organic thin-film EL element using a low molecular material, a vacuum evaporation apparatus in which a plurality of evaporation vessels are connected is required, and productivity is low and manufacturing cost is high.

  On the other hand, an organic EL element using a polymer material as an organic light emitting medium layer has been proposed. As the organic light emitting layer in the organic light emitting medium layer, a low molecular weight organic light emitting material dissolved in a polymer such as polystyrene, polymethyl methacrylate, polyvinyl carbazole, a polyphenylene vinylene derivative (PPV), a polyalkylfluorene derivative ( High molecular organic light emitting materials such as PAF) are used. These organic light-emitting materials can be formed by a wet method such as a spin coating method, a flexographic printing method, or a gravure printing method by dissolving or stably dispersing in a solvent to form an ink. Compared to the organic EL element using the above-described low molecular weight material, there is an advantage that film formation under atmospheric pressure is possible and equipment cost is low.

  However, the high-definition patterning required for a full-color display panel is difficult by these wet coating methods and printing methods. As another method, a high-definition pattern printing method using an inkjet method has been proposed, but it is difficult to form a film with a uniform thickness, pattern shape control is difficult, and color mixing with adjacent pixels is a problem. there were.

  Therefore, as a method for solving these problems, an offset printing method (Patent Document 1) and an offset printing method using a relief reversal method (Patent Document 2) have been proposed.

  The offset printing method and the offset printing method using the letterpress inversion method both use a blanket made of a smooth rubber layer, fix the blanket to the blanket cylinder, and transfer the patterned ink on the blanket surface to the transfer target. In addition, there is an advantage that the ink pattern shape and the film thickness can be easily controlled.

However, in the offset printing device used for printing a high-definition ink pattern such as the formation of an organic light emitting layer on the substrate to be printed or the offset printing device using the letterpress reversal method, the printing position is caused by the deviation between the blanket and the blank cylinder. Since printing troubles such as misalignment and doubling occur, it is necessary to apply the blanket uniformly to the blanket cylinder. For this, after the blanket is mounted on the blanket cylinder, the blanket is pulled on the blanket by displacing both ends of the blanket (Patent Document 3), or one blanket is fixed to the blanket cylinder, and then the blanket is pulled with a standardized tension. In addition, a method of winding around a bran cylinder while maintaining the value and fixing the terminal end to the bran cylinder has been proposed (Patent Document 4).
JP 2001-93668 A JP 2003-17248 A JP 7-1715 A Japanese Patent Laid-Open No. 11-10835

  However, in the above conventional method, depending on the blanket of the surface contacting the blanket and the material and surface shape of the blanket, the blanket cannot be sufficiently adhered to the blanket when the blanket is mounted, and a gap ( Space) may form. Also, when printing for a long time, because there is not enough adhesion between the blanket and the blanket cylinder, the blanket will gradually shift between the blanket and the blanket, and the blanket will be distorted between the blanket and the blanket cylinder. There was a case where a gap was formed.

  These gaps cause problems such as printing position misalignment and printing troubles such as duplication. In particular, in the case of organic EL elements, it is necessary to accurately control not only the printing position but also the pattern shape and film thickness. Even if the gap between the blanket and the blank cylinder is very small, pattern shape unevenness and film thickness unevenness occur. When an organic EL element is formed, it causes light emission failure and element deterioration. Therefore, there has been a problem that a high-performance organic EL element such as a full color display cannot be obtained.

  In addition, when the blanket is wound by tension, if the tension is too large, the thickness and compressibility of the blanket change, and printing parameters change accordingly, resulting in a printing failure. Further, in order to wind the blanket around the blanket cylinder while maintaining the tension, it is necessary to newly provide a tension jig in the printing apparatus.

  The present invention has been made in view of the above problems, and when a blanket is attached to a blanket cylinder in an offset printing apparatus and an offset printing apparatus using a letterpress reversal method, an appropriate tension is maintained with the blanket and the blanket cylinder being in close contact with each other. It is an object of the present invention to provide a simple mounting method for a blanket that allows the blanket to be kept in close contact during printing. In addition, using a blanket with a blanket closely attached to the blanket cylinder, an offset printing apparatus having the blanket cylinder, and an offset printing apparatus using a letterpress reversal method, printed matter that is free of printing problems such as printing misalignment and duplication, especially pattern shape unevenness. Another object of the present invention is to obtain an EL element having an organic light emitting layer with no film thickness unevenness.

In order to solve the above-mentioned problems, an invention according to claim 1 is directed to an offset printing apparatus in which a blanket and a plate are brought into contact to form an ink pattern on the blanket, and the ink pattern on the blanket is transferred to and printed on a substrate to be printed. in mounting the bran cylinder and a step of spreading a blanket on a printing stage, and fixing one end of the blanket bran cylinder, a step of mounting the blanket while pressing rotating the bran cylinder to bran cylinder , comprising the step of fixing the other end of the blanket Blanc cylinder, the step of fixing one end of said blanket Blanc cylinder secures sandwiching one end of the blanket to the previously applied was cut out portion Blanc cylinder a step, the step of mounting the bran cylinder blanket while pressing rotating the bran cylinders, Bed Banquet with fixing the entire surface or bran cylinder blanket and Blanc cylinder on the entire surface by forming an adhesive layer, attaching the blanket while pressing at the same pressure as the contact between the blanket and the printing plate rotates the Blanc cylinder in Bran cylinder The blanket mounting method is characterized in that the step of fixing the other end of the blanket to the blanket cylinder is a process of sandwiching and fixing the other end of the blanket to a cut-out portion previously applied to the blanket cylinder . .

The invention according to claim 2 is an offset printing apparatus in which a blanket is attached to a blanket cylinder by the blanket attaching method according to claim 1 .

The invention according to claim 3 is an offset printing apparatus characterized in that the offset printing apparatus according to claim 2 is a letterpress inversion method.

The invention according to claim 4 is an organic light-emitting ink obtained by dissolving or dispersing an organic light-emitting material in a solvent by an offset printing process using a letterpress inversion method in which a blanket is mounted on a blanket cylinder by the blanket mounting method according to claim 1. A method for producing an organic EL device using an organic light emitting layer, wherein the blanket material is made of a silicone elastomer or a fluorine elastomer, and the 10-point average roughness of the blanket surface is 0.1 μm or less. It was set as the manufacturing method of the organic EL element characterized by having.

  According to the present invention, in the mounting method for mounting the blanket used in the offset printing apparatus and the offset printing apparatus using the relief printing method on the blanket cylinder, the blanket cylinder is rotated and pressed while the blanket is spread on the printing stage. However, by mounting the blanket on the blanket cylinder installed in the offset printing apparatus, it was possible to easily mount the blanket and the blanket cylinder in close contact with each other while escaping air between the blanket and the blanket cylinder.

  Further, by fixing the blanket and blanket cylinder over the entire surface, it was possible to further suppress the deviation between the blanket and blanket cylinder during printing.

  Further, by using an offset printing apparatus in which the blanket is brought into close contact with the blanket cylinder and an offset printing apparatus using a letterpress reversal method, a highly accurate printed matter can be obtained. In particular, when forming an organic light emitting layer in an organic EL element, printing is performed with a uniform printing pressure by pattern-printing an organic light emitting ink made of an organic light emitting material on a substrate to be printed using such an offset printing apparatus. The organic light emitting layer has a stable pattern shape and film thickness, an organic light emitting layer having a uniform pattern with no film thickness unevenness or pattern unevenness, and a high performance organic EL element. .

  A method for mounting the printing blanket on the blanket cylinder according to the present invention is shown schematically in FIG.

  In FIG. 1, a blanket 03 is installed on the printing stage 04. One end of the blanket is fixed (beginning), the positions of the blank cylinder 02 and the printing stage 04 on the main body frame 01 are adjusted so that the blanket 03 is compressed, the printing stage 04 is moved, The blanket is attached to the blanket while the blanket 03 is closely attached. At this time, by pressing the blanket with the blanket, it is possible to mount the blanket and the blanket in close contact with each other while sequentially releasing air between the blanket and the blanket. Then, the other blanket end (terminating) is fixed.

  Note that the pressure applied to the blanket when the blanket is mounted is preferably the same as the printing pressure applied to the intaglio in offset printing, the relief printing in reverse offset printing, and the printing pressure applied to the transferred object from the blank cylinder through the blanket during printing. . At this time, the start and end of the blanket are fixed by the adhesive layer. In addition, it is also possible to fix using a special jig together with fixing by the adhesive layer. For example, both ends of the blanket may be sandwiched and fixed in a cut-out portion that has been previously applied to the blanket cylinder.

  In addition, it is preferable to have an adhesive layer on the entire surface of the blanket or the entire surface of the blanket cylinder, and to attach the blanket and fix the blanket and blanket cylinder over the entire surface, because the blanket and blanket cylinder are more firmly fixed. The adhesive layer can be formed on the blanket cylinder or on the blanket surface.

  In addition, as a material for forming the adhesive layer, a liquid, gel, or film adhesive made of acrylic, rubber, silicone, rosin, terpene, or the like can be used. As the method for forming the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is formed by a method in which a pressure-sensitive adhesive is coated on the surface of the blanket or the blanket cylinder and dried, or by a method in which a pressure-sensitive adhesive layer having a release paper is pressure-bonded to the blanket or blanket cylinder.

  A printing method by the offset printing apparatus of the present invention will be described in detail with reference to FIG.

  FIGS. 2A to 2D are schematic views showing the offset printing apparatus and the offset printing process of the present invention. In FIG. 2, a blanket 03 is mounted around a blanket cylinder 02 on the main body frame 01. Reference numeral 04 denotes a printing stage, which fixes the original intaglio 05 or the transfer substrate 06 during printing. Further, the printing stage 04 is movable in the uniaxial direction. In the figure, 07 is ink, and 08 is a doctor blade.

  An intaglio 05 is fixed on the printing stage 04, and ink is supplied onto the intaglio 05 by an ink supply means (not shown). Excess ink is removed by the doctor blade as the ink printing stage 04 moves, and the pattern of the intaglio 05 is removed. The part is filled with ink 07 (FIG. 2A). Further, the printing stage 04 is moved and the blank cylinder 02 is rotated, whereby the ink of the intaglio 05 is received on the blanket 03 and an ink pattern is obtained on the blanket (FIG. 2B). Next, when the printing stage 04 is moved and the blank cylinder 02 is rotated, the ink pattern on the blanket is transferred onto the transfer substrate 06, and the printing process is completed (FIGS. 2C and 2D).

  The printing method by the offset printing apparatus using the relief reversing method of the present invention will be described in detail with reference to FIG.

  FIGS. 3A to 3D are schematic diagrams showing an offset printing apparatus using a relief printing method and an offset printing process using a relief printing method according to the present invention. In FIG. 3, a blanket 03 is mounted around a blanket cylinder 02 on the main body frame 01. Reference numeral 04 denotes a printing stage, which fixes the relief plate 09 or the transfer substrate 06, which is the original plate, at the time of printing. Further, the printing stage 04 is movable in the uniaxial direction. Reference numeral 07 shown in the figure is ink.

  A letterpress 09 is fixed on the printing stage 04, and ink 07 is previously applied to the blanket 03 by an ink supply means (not shown) using a coating such as curtain coating, bar coating, wire coating, or slit coating. It has been applied. (FIG. 3A) By moving the printing stage 04 and rotating the blanket cylinder, the ink film on the blanket 03 is removed by the relief pattern 09, which is the negative pattern of the desired pattern, and the ink on the blanket is removed from the desired pattern. (FIG. 3B). Next, the printing stage 04 is moved and the blanket cylinder is rotated, whereby the ink pattern on the blanket is transferred onto the transfer substrate 06, and the printing process is completed (FIGS. 3C and 3D).

  Note that the offset printing apparatus and the offset printing apparatus using the letterpress reversal system according to the present invention may be a system in which the stage is fixed and the blanket cylinder moves when the blanket is mounted and during printing.

  The printing blanket in the present invention is only required to be chemically stable and have solvent resistance and flexibility. The shape is not particularly limited, but a flat surface is preferable from the viewpoint of obtaining film uniformity of the organic light emitting medium layer, and a ten-point average roughness Rz ≦ 0.1 μm is preferable.

  The material constituting the printing blanket is preferably composed of a material having a certain degree of flexibility, such as a polymer film or rubber. For example, fluororesin, polyacrylate, polycarbonate, polyolefin, polymethyl methacrylate, polyethylene It is formed using terephthalate, polyamide, polyvinyl chloride, polyvinylidene chloride, ethylene-vinylene acetate copolymer, polyethersulfone, silicone elastomer, fluorine elastomer, butyl rubber, ethylene propylene rubber, or a mixture thereof. Further, the printing blanket may have a laminated structure having a cushion layer, a base film layer, a primer layer, and the like. Further, the printing surface of the printing blanket may be treated with fluororesin or silicone.

  The printing ink 07 can be appropriately selected depending on the function of the pattern to be produced. Organic light-emitting materials used in the organic light-emitting layer of the organic EL element include coumarin-based, perylene-based, pyran-based, anthrone-based, porphyrin-based, quinacridone-based, N, N′-dialkyl-substituted quinacridone-based, naphthalimide-based, N, N Fluorescent dyes such as' -diaryl-substituted pyrrolopyrrole, indium complex, etc. dissolved in polymers such as polystyrene, polymethyl methacrylate, polyvinylcarbazole, polyarylene, polyarylene vinylene, polyfluorene, etc. Is mentioned. In addition, it is preferable that the film thickness of an organic light emitting layer is 50 micrometers-150 nm.

  These organic light emitting materials are dissolved in a single or mixed solvent such as toluene, xylene, anisole, mesitylene, tetralin, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methanol, ethanol, isopropyl alcohol, ethyl acetate, butyl acetate, water, Organic luminescent ink. Moreover, you may add surfactant, antioxidant, a viscosity modifier, a ultraviolet absorber etc. to organic luminescent ink as needed.

  Hereinafter, the blanket mounting mechanism of the present invention and the organic EL element manufacturing method using the offset printing method or the relief reversal offset printing method will be described in detail.

  First, FIG. 4 shows a schematic diagram of the organic EL device of the present invention. In the transferred substrate 06 in the present embodiment, a transparent conductive layer 11 that is an anode and a hole transport layer 12 are provided on a translucent substrate 10. An organic light emitting layer and a cathode are provided thereon. A charge transport layer or the like may be provided on the organic light emitting layer.

  As the transparent conductive layer 10, a composite oxide of indium and tin (hereinafter referred to as ITO) can be used, and can be formed on the substrate by vapor deposition or sputtering. Alternatively, a precursor such as indium octylate or indium acetone can be formed on the base material by a coating pyrolysis method in which an oxide is formed by thermal decomposition. Alternatively, a material in which a metal such as aluminum, gold, or silver is vapor-deposited in a translucent state can be used. Alternatively, an organic semiconductor such as polyaniline can also be used.

  The glass or plastic substrate on which the transparent conductive layer 10 is laminated does not need to be produced specifically for the present invention, and a commercially available substrate may be used in accordance with the resistivity and light transmittance of the conductive layer. it can.

  The transparent conductive layer 10 may be patterned by etching as necessary, or may be activated by UV treatment, plasma treatment, or the like. In place of etching, nitrocellulose, polyamide, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, acrylic resin, urethane resin, or the like may be formed as an insulating layer.

  As a hole transport material used for the hole transport layer 12, a polymer material such as a polyaniline derivative, a polythiophene derivative, a polyvinyl carbazole derivative, a mixture of poly (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid is used. Can do. A surfactant, an antioxidant, a viscosity modifier, an ultraviolet absorber, and the like may be added to the hole transport layer 4 as necessary. At this time, the thickness of the hole transport layer 4 is preferably 10 to 120 nm.

  These hole transport materials are dissolved in a single or mixed solvent such as toluene, xylene, anisole, mesitylene, tetralin, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methanol, ethanol, isopropyl alcohol, ethyl acetate, butyl acetate, and water. Or it can disperse | distribute and can apply | coat by coating methods, such as a spin coat, a bar coat, a wire coat, and a slit coat. Pattern formation is performed as necessary using gravure printing, flexographic printing, screen printing, photolithography, or the like. Further, patterning may be performed by using the blanket mounting mechanism of the present invention and the offset printing method or the relief reverse printing method using these.

  Next, the organic light emitting layer 13 is pattern-printed by the blanket in which the blanket is mounted on the blanket cylinder by the blanket mounting method of the invention and the offset printing apparatus or the letterpress reverse offset printing apparatus in which the blanket cylinder is arranged.

  The cathode layer 14 can be known as a single metal such as lithium, magnesium, calcium, ytterbium or aluminum, or an alloy or a multilayer of a stable metal such as gold or silver in accordance with the light emission characteristics of the organic light emitting medium layer. . Alternatively, a conductive oxide such as indium, zinc, or tin can be used. These materials can be provided by normal resistance heating, vacuum deposition such as EB overheating, sputtering, or the like. The film thickness is not particularly limited, but is preferably 1 nm to 500 nm. Further, a thin film such as lithium fluoride may be provided between the cathode layer and the organic light emitting medium layer. An evaporation mask or the like can be used when patterning the cathode layer. Further, a protective layer may be provided on the cathode layer with an insulating inorganic material or resin.

  By using the mounting method of the present invention, the organic light-emitting medium layer 13 is accurately patterned and printed on the substrate to be printed 06, as compared with the offset printing method and the offset printing method using the relief printing method. Is possible.

  Further, the offset printing apparatus having the blanket mounting mechanism and the blanket and the blank cylinder and the offset printing apparatus using the letterpress reversal method of the present invention can be applied to a color filter which is a liquid crystal display member. As in the case of the organic EL element, the present invention can be used for high-definition patterning by separately coating R (red), G (green), B (blue), and black matrix.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to the following examples.

  In this example, a silicone blanket having an adhesive layer on the surface to be attached to the blanket cylinder was used as the blanket. The intaglio used was a 100 mm × 100 mm × 1.2 mm glass having a pattern of 100 lines with a depth of 30 μm, lines / spaces of 150 μm / 150 μm and a length of 80 mm. Further, glass of 100 mm × 100 mm × 1.0 mm was used for the substrate to be printed. Further, a toluene / anisole mixed solution of 1.0% by weight of poly (2-methoxy-5- (2'-ethylhexyloxy) -1,4-phenylene vinylene) (MEH-PPV) was used as the ink.

  A pattern was formed by an offset printing apparatus having a blanket cylinder on which a blanket was mounted using the blanket mounting method of the present invention, and printing was performed 10 times continuously using the same blanket. As a result of comparing the pattern position of the obtained printed matter with the pattern of the intaglio 05, the relative positional deviation of the printed matter was ± 4 μm with respect to the printing direction.

  A blanket was mounted on a 100 mm × 100 mm × 1.2 mm glass using a relief plate having a negative pattern consisting of 100 lines with a depth of 30 μm, a line / space of 150 μm / 150 μm, and a length of 80 mm. The pattern printing was continuously carried out 10 times for MEH-PPV ink in the same manner as in Example 1 by an offset printing apparatus using a letterpress reversal method in which a blank cylinder was arranged. As a result of comparing the pattern position of the obtained printed matter with the pattern of the intaglio, the relative positional deviation of the printed matter was ± 5 μm with respect to the printing direction.

  Etching ITO on a transparent substrate made of glass with ITO, which is a transparent conductive material, into a predetermined pattern to form a transparent conductive layer, and then poly (3,4-ethylenedioxythiophene), polystyrene sulfonic acid, Was printed in a pattern by a screen printing method to obtain a hole transport layer having a thickness of 50 nm.

  Next, similarly to Example 1, a MEH-PPV ink pattern was printed by an offset printing apparatus in which a blanket cylinder on which a blanket was mounted was arranged by the blanket mounting method of the present invention to obtain an organic light-emitting medium layer 13 having a thickness of 100 nm. Subsequently, calcium and silver were formed as a cathode layer 14 by 10 nm and 200 nm, respectively, by a vacuum deposition method to obtain an organic EL element.

This organic EL element is 5.5. V showed 100 cd / m ² patterned light emission, and no defects such as light emission unevenness were observed.

(Comparative Example 1)
In this comparative example, an offset printing apparatus in which the same blanket as that of Example 1 was attached to the blanket cylinder as shown in FIG. 5 and the blanket cylinder was arranged was used. FIG. 5 is a schematic diagram of a blanket cylinder cross section for explaining a blanket mounting method according to this comparative example.

  In FIG. 5A, the blanket 03 is wound around the blanket cylinder 02, and both ends of the blanket are folded into the cutout portions 15 of the blanket cylinder. In FIG.5 (b), the blanket was fixed using the holding screw 16 so that a blanket might be wound in the cut-out part of the blanket cylinder in which the blanket was folded. At this time, tension was applied to the blanket by tightening the holding screw.

  Using the offset printing apparatus in which the blanket with the blanket attached was arranged in this manner, pattern printing of MEH-PPV ink was performed 10 times in the same manner as in Example 1. When the relative positional deviation of the printed material was measured, it was ± 10 μm with respect to the printing direction.

(Comparative Example 2)
As in Comparative Example 1, the pattern printing of MEH-PPV ink was carried out 10 times in the same manner as in Example 2 using a relief printing offset printing apparatus in which a blanket cylinder equipped with a blanket as shown in FIG. The relative positional deviation of the printed material was measured and found to be ± 15 μm relative to the printing direction.

It is a figure which shows the mounting process of the blanket in this invention. It is the schematic diagram which showed the offset printing apparatus and offset printing process in this invention. It is the schematic diagram which showed the offset printing apparatus by the relief printing inversion method in this invention, and the offset printing process by a relief printing inversion method. It is sectional drawing of the organic EL element by this invention. It is a schematic diagram of a blanket cylinder section explaining a wearing method of a blanket by comparative examples 1 and 2.

Explanation of symbols

01 ·· Body frame 02 · · Blank cylinder 03 · · Blanket 04 · · Printing stage 05 · · Intaglio 06 · · Transfer substrate 07 · · Ink 08 · · Doctor blade 09 · · Letterpress 10 · · Translucent substrate 11 · · Transparent conductive layer 12 · · Hole transport layer 13 · · Organic light-emitting layer 14 · · Cathode layer 15 · · Cutout portion 16 · · Set screw

Claims (4)

In an offset printing machine that forms an ink pattern on the blanket by bringing the blanket and the plate into contact with each other and transfers and prints the ink pattern on the blanket to the printing substrate, when the blanket is mounted on the blank cylinder, A step of spreading, a step of fixing one end of the blanket to the blanket cylinder, a step of attaching the blanket to the blanket cylinder while rotating and pressing the blanket cylinder, and a step of fixing the other end of the blanket to the blanket cylinder. And
The step of fixing one end of the blanket to the blanket cylinder is a step of sandwiching and fixing one end of the blanket to a cut-out portion previously applied to the blanket cylinder ,
The step of attaching the blanket to the blanket cylinder while rotating and pressing the blanket cylinder includes fixing the blanket and the blanket cylinder with an adhesive layer formed on the entire blanket or the entire blanket cylinder, and rotating the blanket cylinder to rotate the blanket. Is a process of mounting the blanket on the blanket cylinder while pressing with the same pressure as the contact with the plate ,
The blanket mounting method, wherein the step of fixing the other end of the blanket to the blanket cylinder is a step of sandwiching and fixing the other end of the blanket to a cutout portion previously provided on the blanket cylinder .
An offset printing apparatus in which a blanket is mounted on a blanket cylinder by the blanket mounting method according to claim 1 . 3. The offset printing apparatus according to claim 2, wherein the offset printing apparatus is a letterpress reversal system. An organic light-emitting layer is formed by using an organic light-emitting ink obtained by dissolving or dispersing an organic light-emitting material in a solvent by an offset printing process using a relief printing method in which a blanket is mounted on a blanket cylinder by the blanket mounting method according to claim 1. A method of manufacturing an EL element,
The blanket material is made of silicone elastomer or fluorine elastomer,
10. A method for producing an organic EL device, wherein the blanket surface has a ten-point average roughness of 0.1 [mu] m or less.

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