JP5418115B2 - Letterpress printing machine - Google Patents

Description

The present invention relates to a printing machine for forming a print pattern having a uniform film thickness by printing an ink dissolved in a solvent on a substrate to be printed.

An organic electroluminescence element (hereinafter referred to as an organic EL element) is a light-emitting element having a structure in which an organic light-emitting layer having an organic light-emitting material is sandwiched between two opposing electrode substrates. Is an element that takes out the energy generated by recombination of the hole-electron pair on the surface or inside of the organic light emitting layer as light. The organic light emitting layer has a multilayer structure from one layer to another. However, in order to emit light efficiently, it is important to control the film thickness of each layer, and it is necessary to form a thin film of about 100 nm, for example. Furthermore, in order to make a display, it is necessary to pattern the organic light emitting layer with a uniform film thickness and high definition.

When using a low molecular weight material as a means for patterning the light emitting layer in order to make the organic EL element full color, a light emitting material having a different light emitting color using a mask in which a pattern corresponding to a desired pixel shape is formed. A method of depositing and forming a film on a portion corresponding to a desired pixel is performed. This method is an excellent method for uniformly forming a thin film in a desired shape, but there is a problem that it becomes difficult to form a pattern in terms of mask accuracy when the substrate to be deposited becomes large.

On the other hand, when a polymer material is used, an organic polymer light emitting material is converted into an ink by dissolving or dispersing in a solvent, and pattern formation mainly by an ink jet method and pattern formation by printing are proposed. For example, in the ink jet method disclosed in Japanese Patent Laid-Open No. 10-12377 (Patent Document 1), a light emitting material dissolved in a solvent is ejected from an ink jet nozzle onto a substrate and dried on the substrate to form a desired pattern. How to get. However, the ink droplets ejected from the nozzle are spherical, and when the ink lands on the substrate, the ink spreads in a circular shape, so that the patterning shape is poor, the landing accuracy is low, and the linearity of the pattern cannot be obtained. There is a point. On the other hand, for example, in the technique disclosed in Japanese Patent Laid-Open No. 2002-305077 (Patent Document 2), a bank is formed on a substrate with a material that exhibits ink repellency using photolithography or the like in advance. By causing ink droplets to land there, ink is repelled according to the bank shape, and a linear pattern is obtained. However, when the repelled ink returns to the inside of the pixel, the ink swells inside the pixel, and there remains a problem that the film thickness of the organic light emitting layer in the pixel varies.

As a pattern forming method by printing, intaglio printing, planographic printing, screen printing, letterpress printing, and the like have been proposed. However, in organic EL elements and displays that use a glass substrate or the like as a substrate to be printed, scratches or distortions of the substrate are not preferred, and thus a method using a hard plate such as a metal printing plate such as gravure printing is not suitable. is there. Further, inks obtained by dissolving or dispersing an organic light emitting layer forming material in a solvent generally have low viscosity, and are not suitable for offset printing or screen printing. On the other hand, the relief printing method using a photosensitive resin plate mainly composed of rubber or other resin does not damage the glass substrate and is suitable for low viscosity ink. Actually, formation of an organic light emitting layer by a relief printing method has been proposed (Patent Document 3).

In an ink supply unit of a printing press used for letterpress printing, a closed system is often employed to suppress a change in ink viscosity due to volatilization of a solvent. In addition, a device that suppresses solvent volatilization on the anilox roll surface by using a unit that minimizes the exposure of the anilox roll surface to the atmosphere has been proposed (Patent Document 4).

In the relief printing method, the ink on the anilox roll is transferred to the relief plate and then patterned on the substrate to be printed. At this time, since the amount of ink transferred on the relief printing plate for forming a thin film is very small, volatilization of the solvent tends to proceed more easily than an anilox roll in which ink is always present on the entire surface. Ink that has dried excessively on the relief printing plate has a patterning defect on the substrate to be printed.

Japanese Patent Laid-Open No. 10-12377 JP 2002-305077 A JP 2008-216949 A JP 2009-59496 A

The present invention has been made to solve the above problems, and an object of the present invention is to provide a relief printing machine capable of transferring a print pattern having a uniform film thickness with no transfer failure onto a substrate to be printed.

As means for solving the above-mentioned problems, the invention according to claim 1 is a printing machine for printing a fine pattern on a substrate to be printed, the moving surface plate for conveying the substrate to be printed, A rotary plate cylinder arranged on a surface plate, a relief plate arranged around the plate cylinder, an anilox roll arranged so as to have a rotation axis in the same direction as the rotation axis of the plate cylinder, and the anilox An ink supply device for supplying ink to the roll, a mechanism for bringing the anilox roll and the relief plate into contact with each other and transferring the ink onto the relief plate, and a plate cover arranged to cover the periphery of the relief plate, And a relief printing machine for transferring the ink transferred onto the relief printing plate in contact with the substrate to be printed, wherein the printing plate cover transfers the ink from the anilox roll onto the relief printing plate. Serial between until transferred to the printing substrate, a printing machine, wherein the said on letterpress ink is disposed in a region that is transcribed and is removable from the relief printing press.

The invention according to claim 2 is a printing machine that prints a fine pattern on a substrate to be printed, and a moving surface plate for conveying the substrate to be printed, and a rotary type disposed on the surface plate. A plate cylinder, a relief plate arranged around the plate cylinder, an anilox roll arranged so as to have a rotation axis in the same direction as the rotation axis of the plate cylinder, and an ink supply device for supplying ink to the anilox roll An ink transferred to the relief plate, and a mechanism for transferring the ink onto the relief plate by bringing the anilox roll and the relief plate into contact with each other, and a plate cover arranged to cover the periphery of the relief plate In the letterpress printing machine for transferring the ink in contact with the substrate to be printed, the plate cover is configured to transfer the ink from the anilox roll onto the letterpress plate, and from the letterpress to the substrate to be printed. It is arranged on the entire surface except for that area, and a printing machine, characterized in that said detachable from a relief printing press.

The invention according to claim 3 is characterized in that the inner surface of the plate cover has the same curvature as the curvature of the relief plate arranged around the plate cylinder. It is a printing machine.

According to a fourth aspect of the present invention, in the printing machine according to any one of the first to third aspects, the material of the plate cover is a metal.

The invention described in Claim 5, the plate cover is printed according to any one of claims 1 to 4, characterized by having a mechanism for adjusting the area where said plate cover covering the relief plate Machine.

As described above, according to the present invention, from the transfer region of ink from the anilox roll to the relief plate to the transfer region of ink from the relief plate to the printing substrate, or the transfer region from the anilox roll to the relief plate, and from the relief plate to the printing substrate. By providing a metal plate cover with the same curvature as that of the relief plate on the entire relief plate area excluding the transfer area to the relief plate, the ink is transferred onto the relief plate and then patterned on the printing substrate. By suppressing the drying of the upper ink, a uniform print pattern with no unevenness in film thickness can be formed.

In addition, by providing a mechanism that adjusts the boiling point of the solvent that uses the area covering the relief plate to the plate cover that covers the relief plate, viscosity suitable for transferring ink from the anilox roll to the relief plate and ink from the relief plate to the printing substrate Even when the viscosity suitable for the transfer of the toner is different, it can be adjusted to a viscosity suitable for printing from the relief plate onto the substrate to be printed on the relief plate.

Schematic sectional view for explaining an example of a printing machine of the present invention Schematic cross-sectional view for explaining an example of the printing machine of the present invention in which the entire surface of the relief plate excluding the transfer area from the relief plate to the printing substrate is a closed space Schematic sectional view of a conventional printing machine

Embodiments of a printing press according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

As shown in FIG. 1, the printing press according to the embodiment of the present invention conveys a rotary plate cylinder 102, a relief plate 101 for forming a light emitting pattern formed around the plate cylinder 102, and a printing substrate 106. A moving surface plate, an anilox roll 104 that supplies ink onto the relief plate 101, an ink supply device 103 that supplies ink to the anilox roll 104, and a plate cover 108 that prevents drying of the ink on the relief plate 101. ing. Next, each configuration of the present invention will be described in detail.

The plate cylinder 102 is disposed on a movable surface plate and is rotatably supported at a fixed position. The relief plate 101 is mounted on the peripheral surface of the plate cylinder 102. The anilox roll 104 is installed in parallel with the rotational axis of the plate cylinder 102 and in contact with the plate surface on the surface of the relief plate 101. The ink supply device 103 is installed so that the anilox roll 104 and the supply port of the ink supply device 103 are in contact with each other according to the type of the ink supply device 103. The printed substrate 106 is placed on a moving surface plate. The moving surface plate is installed so as to move horizontally in a direction orthogonal to the rotation axis of the plate cylinder 102. The plate cover 108 covers the plate surface of the relief plate 101 so that the inner surface of the plate cover 108 and the plate surface of the relief plate 101 are not in contact with the periphery of the relief plate 101 other than the portion where the printed substrate 106 and the anilox roll 104 are in contact with the relief plate 101. Installed.

As the anilox roll 104 rotates, the ink supplied from the ink supply device 103 is uniformly held on the surface of the anilox roll 104 and then transferred to the plate surface of the relief plate 101 attached to the plate cylinder 102. The substrate 106 to be printed is fixed on a slidable moving surface plate, and is moved to the printing start position while adjusting the position by the position adjustment mechanism of the pattern of the relief plate 101 and the pattern of the substrate. From the printing start position, the substrate to be printed 106 contacts the convex portion of the relief plate 101 and moves in synchronization with the rotation of the plate cylinder 102. The ink is transferred by patterning from the relief plate 101 to a predetermined location on the substrate 106 to be printed. A functional layer is formed. After the printing substrate 106 is provided with the ink pattern, a drying process using an oven or the like can be provided as necessary.

The anilox roll 104 according to the embodiment of the present invention supplies ink to the relief plate 101 while rotating at the same peripheral speed as the peripheral speed of the plate cylinder 102. The anilox roll 104 can be made of chrome or ceramics, and it is desirable that the outer surface of the anilox roll 104 be formed with patterns such as fine holes, recesses, and cells for holding ink. .

The position where the anilox roll 104 and the relief plate 101 are in contact with each other as long as the ink supply means does not interfere with the moving surface plate and the substrate 106 to be printed. The closer to the point where the printing substrate 106 contacts, the shorter the distance from the ink supply position to the relief plate 101 to the contact point between the relief plate 101 and the printing substrate 106, and at the same time, ink is applied to the plate surface of the relief plate 101. This is desirable because it reduces the amount of time that is spent and prevents drying of the ink.

As the ink supply device 103 according to the embodiment of the present invention, a drop-type ink supply device 103, a coater such as a fountain roll, a die coater, or a cap coater, or a combination thereof can be used. In order to supply the ink uniformly onto the anilox roll 104, it is desirable to provide a doctor blade. Furthermore, it is desirable that an ink replenishing device (not shown) for replenishing ink and an ink tank (not shown) for storing ink are connected to the ink supply device 103.

The material used as the base material of the relief plate 101 used for the relief plate 101 according to the embodiment of the present invention is only required to have mechanical strength against printing, such as polyethylene, polystyrene, polybutadiene, polyvinyl chloride, polyvinylidene chloride, and polyacetic acid. Known synthetic resins such as vinyl, polyamide, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, and polyvinyl alcohol, known metals such as iron, copper, and aluminum, or laminates thereof can be used.

Furthermore, as a base material which comprises the relief plate 101, what maintains high dimensional stability is desirable, and a metal is used suitably as a material used as a base material. Examples of the metal used as the base material include iron, aluminum, copper, zinc, nickel, titanium, chromium, gold, silver, alloys thereof, and laminates. In particular, iron is the main component in terms of workability and economy. The steel base material and aluminum base material which can be used can be used suitably.

When the plate surface of the relief plate 101 is formed of a resin, as a method for forming the protrusions on the plate surface, a photolithography method using a positive photosensitive resin, a photolithography method using a negative photosensitive resin, injection molding, a relief plate Various pattern molding methods such as printing method, intaglio printing method, lithographic printing method, stencil printing method, laser ablation method, etc. can be used. From the viewpoint of high definition of pattern, photolithography method using photosensitive resin In addition, a photolithography method using a negative photosensitive resin capable of forming a relief with the required accuracy is most desirable.

When applying a photolithographic method using a photosensitive resin as a convex pattern forming method, the relief plate 101 is formed from a plate-shaped photosensitive resin laminate in which a base material layer, an antireflection layer, and a photosensitive resin layer are sequentially laminated. It is most desirable to form a convex part. As a method for molding the photosensitive resin layer, a known method such as an injection molding method, a protruding molding method, a laminating method, a bar coating method, a slit coating method, or a comma coating method can be used.

When the plate surface of the relief plate 101 is formed of a resin, the resin to be used is only required to have solvent resistance to ink, such as nitrile rubber, silicone rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, acrylonitrile rubber, ethylene. In addition to rubbers such as propylene rubber and urethane rubber, polyethylene, polystyrene, polybutadiene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyamide, polyether sulfone, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, polyvinyl alcohol, etc. Synthetic resins, their copolymers, cellulose derivatives, etc., fluoroelastomers, polytetrafluoroethylene, polyvinylidene fluoride, poly (vinylidene fluoride) and their It is possible to select one or more of a fluorine-based resin such as polymer.

The relief plate 101 according to the embodiment of the present invention is used by winding the relief plate 101 having the projection pattern formed on the substrate as described above around the plate cylinder 102. A convex pattern may be formed on the plate cylinder 102.

In printing using the relief plate 101, the ink transferred from the anilox roll 104 to the surface of the relief plate 101 is easy to dry. If the viscosity distribution of the ink on the relief plate 101 is biased or solidifies by drying, the printing substrate 106 is printed. Unevenness occurs in the thickness of the organic light emitting layer formed.
Thus, by covering the portion of the peripheral surface of the relief plate 101 that is in contact with the atmosphere with the plate cover 108, drying of the ink transferred to the surface of the relief plate 101 can be suppressed, and an organic light emitting layer can be formed without unevenness.

Next, the plate cover 108 according to the embodiment of the present invention will be described.
FIG. 1 illustrates an anilox roll 104 in a printing process in which ink supplied from an ink supply apparatus 103 onto an anilox roll 104 is transferred onto a printing substrate 106 via a relief plate 101 using a printing machine according to the present invention. 2 is a schematic cross-sectional view illustrating a plate cover 108 in which a region from the transfer of ink to the relief plate 101 to the transfer of ink from the relief plate 101 to the printing substrate 106 is a closed space.

As shown in FIG. 1, the drying of the ink on the relief plate 101 due to atmospheric exposure can be suppressed by installing the plate cover 108 in order to suppress the drying of the ink on the relief plate 101. The plate cover 108 is disposed on the relief plate 101 from the anilox roll 104 so that there is no hindrance to the movement of the anilox roll 104 and the substrate to be printed 106 and their associated devices, and the movement surface plate and the printing substrate 106 on the movement surface plate. It is desirable to have a shape that covers as much as possible the area that can be exposed to the air from the area where the ink is transferred to the area where the ink is transferred from the relief plate 101 to the substrate 106 to be printed.

Further, the curvature of the relief plate 101 and the curvature of the plate cover 108 are matched, and the relief plate 101 and the plate cover 108 are thinly installed so that the plate surface of the relief plate 101 and the inner wall of the plate cover 108 do not touch each other. It is possible to narrow the space in which the ink solvent between 108 can evaporate and reduce the evaporation amount of the solvent after being transferred from the anilox roll 104 to the relief plate 101, thereby further suppressing the drying of the ink. As such a shape, it is sufficient that the curvature of at least the inner surface of the plate cover 108 facing the plate surface of the relief plate 101 is equal to the curvature of the relief plate 101, for example, a curved plate shape obtained by cutting a part of a cylindrical shape having the same curvature as the relief plate 101. Etc. The other plate cover 108 may have any shape that prevents ink from drying, and may be a shape in which a flat plate is combined with the curvature of the relief plate 101, or a part of a cylinder having a curvature different from the curvature of the relief plate 101. The shape may also be

Furthermore, an openable / closable window is provided on the plate cover 108 for controlling the drying state of the relief plate 101 according to the boiling point of the solvent used in the ink, or the plate cover 108 is provided so that a part of the relief plate 101 can be exposed to the atmosphere. It is also possible to provide a mechanism capable of attaching or detaching a part of the ink, and have a viscosity suitable for transferring ink from the anilox roll 104 to the relief plate 101 and a viscosity suitable for transferring ink from the relief plate 101 to the printing substrate 106. Even if different, the viscosity can be adjusted to be suitable for printing from the relief plate 101 to the printing substrate 106 on the relief plate 101.

As described above, the plate cover 108 may be attached only to the ink supply device 103 side, and the relief plate 101 after printing the ink on the printing substrate 106 may be exposed to the atmosphere. However, as shown in FIG. A cover can be installed so that the entire surface of the relief plate 101 excluding the transfer region of ink from the relief plate 104 to the relief plate 101 and the transfer region of ink from the relief plate 101 to the printing substrate 106 is a closed space. This is particularly desirable because it can also prevent foreign matter such as dust from adhering to 101. Further, the plate cover 108 from the anilox roll 104 before printing to the printing substrate 106 and the plate cover 108 from the printing substrate 106 to the anilox roll 104 after printing are integrated, and the anilox roll 104 and the relief plate 101 are in contact with each other. A cylindrical shape having an opening only in the region and a region where the relief plate 101 and the substrate to be printed 106 are in contact with each other may be used. Note that, in any case of the shape of the plate cover 108, it is desirable that the plate cover 108 is detachable from the printing machine for cleaning the relief plate 101.

The material of the plate cover 108 may be any material as long as it does not cause problems such as permeation or absorption of the vapor of the solvent used in the ink, dissolves by the solvent vapor, or reacts with the solvent molecules, and can prevent the ink from drying. . Although plastic plates and films that do not cause problems due to the solvent as described above can be used, since the solvent used is generally an organic solvent, metals can be preferably used, and in particular, workability, stability, economy It is desirable to use iron or aluminum having excellent properties.

The ink to be used is adjusted to a suitable viscosity in consideration of the transfer from the anilox roll 104 to the relief plate 101 in the ink supply device 103 used for coating on the anilox roll 104, and the viscosity of the ink is 2 to 120 mPa · s. It is desirable. In the relief printing method used in the present embodiment, the ink is first transferred from the anilox to the relief plate 101, but after the ink is transferred from the anilox to the relief plate 101 at a viscosity of 120 mPa · s or more, Insufficient ink leveling causes unevenness. In addition, when the pressure is 2 mPa · s or less, the mottling unevenness is likely to occur in the pixel, causing the unevenness.

The amount of ink transferred from the anilox roll 104 onto the relief plate 101 is determined by the film thickness to be formed on the printing substrate 106, but can be transferred onto the relief plate 101 by adjusting the ink density and the anilox roll 104 cell volume. It is desirable to keep the amount of ink produced constant.

The solvent used for the ink used has a boiling point of 100 to 250 ° C. so that the difference in the degree of drying of the ink in the pattern is unlikely to occur so that the entire pattern to be printed is transferred to the printed substrate 106 in a good shape. It is desirable to use a solvent such as xylene or toluene. When a solvent having a boiling point of less than 100 ° C. is used, unevenness of the organic light emitting layer due to drying of the ink cannot be prevented even if the plate cover 108 is provided, and when a solvent having a boiling point higher than 250 ° C. is used. May increase the time for drying after the formation of the organic light emitting layer, increase the heating temperature for drying, damage the organic light emitting layer or other layers, or leave the solvent in the organic light emitting layer. is there.

Examples of the organic light emitting material used by being dissolved in the ink according to the embodiment of the present invention include a coumarin type, a perylene type, a pyrene type, an anthrone type, a porphyrene type, a quinacridone type, an N, N′-dialkyl-substituted quinacridone type, Dissolve low-molecular-weight luminescent dyes such as naphthalimide, N, N'-diaryl-substituted pyrrolopyrrole, iridium complex, platinum complex, and europium complex in polymers such as polystyrene, polymethyl methacrylate, and polyvinylcarbazole. Alternatively, a polymer light-emitting material such as a polymer copolymerized, a polyarylene-based polymer, a polyarylene vinylene-based polymer, or a polyfluorene-based polymer can be used.

Also, coumarin phosphors, perylene phosphors, pyran phosphors, anthrone phosphors, porphyrin phosphors, quinacridone phosphors, N, N′-dialkyl-substituted quinacridone phosphors, naphthalimide phosphors, A material obtained by dispersing a low molecular weight light emitting material such as an N, N′-diaryl-substituted pyrrolopyrrole-based fluorescent pair or a phosphorescent light emitter such as an Ir complex in a polymer can be used. As the polymer, polystyrene, polymethyl methacrylate, polyvinyl carbazole and the like can be used. Further, it may be a polymer light emitting material such as polyarylene, polyarylene vinylene, polyfluorene, polyphenylene vinylene, polyparaphenylene vinylene, polythiophene or polyspiro. In addition, as long as it can be dissolved in a solvent and can be printed by the printing machine of the present invention, it is also possible to use a solution in which a low molecular weight light emitting dye is dissolved in a solvent.

Examples and comparative examples are shown below.
(Preparation of printed substrate 106)
As a substrate to be printed 106, a thin film transistor provided as a switching element provided on a support, a planarization layer formed thereabove, and a pixel electrode that is electrically connected to the thin film transistor through a contact hole in the form of a planarization layer An active matrix substrate provided with One side of the pixel size is 150 μm square, and the size of the RGB sub-pixel is 50 × 150 μm.

A partition wall was formed in such a shape as to cover an end portion of the pixel electrode provided on the active matrix substrate and partition the pixel. The partition walls are formed by forming a positive resist ZWD6216-6 made by ZEON Corporation on the entire surface of the active matrix substrate with a spin coater so that the film thickness after drying is 1 μm, and then by photolithography, the four sides of each subpixel are formed. A partition wall having a line width of 20 μm was formed.

A 1.5 wt% aqueous solution of poly- (3,4) -ethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) was formed to a thickness of 100 nm as a hole transport layer on the pixel electrode by spin coating. . Further, the PEDOT / PSS thin film thus formed was dried at 100 ° C. for 1 hour under reduced pressure to produce a substrate to be printed 106.

(Production of ink)
The following inks consisting of three colors of red, green and blue (R, G, B) were prepared by dissolving in xylene. The red light emitting ink (R) is a xylene 1 wt% solution of a polyfluorene derivative (red light emitting material manufactured by Sumitomo Chemical Co., Ltd., trade name Red 1100). The green light emitting ink (G) is a 1 wt% xylene solution of a polyfluorene derivative (green light emitting material, trade name Green 1300, manufactured by Sumitomo Chemical Co., Ltd.). The blue light-emitting ink (B) is a 1 wt% xylene solution of a polyfluorene derivative (blue light-emitting material manufactured by Sumitomo Chemical Co., Ltd., trade name Blue 1100).

(Preparation of relief plate 101)
An anti-reflection coating is applied by using a nickel material having a thickness of 250 μm as a base material for the photosensitive relief printing plate 101 and applying an acrylic binder resin solution kneaded with a black pigment on the base material so that the dry film thickness is 10 μm and drying. A layer was formed.

Mainly water-soluble polyamide, dipentaerythritol hexakisacrylate as radical polymerizable monomer, 2,2-dimethoxy-1,2-diphenylethane-1-one as photopolymerization initiator (manufactured by Ciba Specialty Chemicals) A photosensitive resin composition obtained by kneading the resin is melt-coated on the surface of the substrate so that the total thickness of the plate material is 310 μm, and the photosensitive resin layer is used, and the polyvinyl alcohol solution has a dry film thickness of 1 μm. A polyethylene terephthalate film (film thickness 125 μm: manufactured by Teijin DuPont Films Ltd.) was laminated.

A relief plate 101 on which a desired pattern was formed was prepared by exposing the relief plate using a synthetic quartz-based chromium mask as a relief plate original and using this mask set in a proximity exposure apparatus.

(Printing process)
The photosensitive relief plate 101 was fixed to the plate cylinder 102 of a sheet-fed relief printing press. Next, ink is supplied to the ink supply device 103 and the anilox roll 104 is rotated to ink the entire surface. The anilox roll 104 was a 600 line / inch anilox roll. Thereafter, excess ink on the anilox roll 104 was scraped off with a doctor blade 105, and the line pattern of the convex portion of the photosensitive relief plate 101 was inked.

At this time, as shown in FIG. 1, it was covered with a plate cover 108 made of an aluminum plate so that a region until the relief printing surface after transferring the ink from the anilox roll was transferred to the printing substrate 106 was a closed space.

A stripe pattern was printed on the printing substrate 106 by pressing the inked photosensitive relief plate 101 against the printing substrate 106 as described above. By repeating this step for each of the red organic light emitting layer, the green organic light emitting layer, and the blue organic light emitting layer, an organic light emitting layer pattern was obtained. After printing for each color, drying was performed in an oven at 130 ° C. for 1 hour.

The average film thickness of each color of the pattern formed as described above is about 80 nm, and the 3σ method, which is a general statistical method, is used, and the value 3σ of the film thickness variation when σ is a standard deviation is 10 nm. there were.

In addition, a 10 nm calcium film and 300 nm silver film were formed by vacuum deposition on the organic light emitting layer formed by printing, and then sealed with a glass cap to prepare an organic EL display element.

When the lighting display of the display element was confirmed, good light emission without unevenness was obtained on the entire panel surface.

<Comparative example>
As a comparative example, an example is shown in which printing is performed using a printing machine having a structure that cannot suppress ink drying on a relief printing plate as shown in FIG.

Using a printing machine as shown in FIG. 3, an organic EL device was produced in the same manner as in the example.

The average film thickness of each color of the formed pattern is about 80 nm, which is equivalent to the example, but the value of 3σ is as large as 20 nm, and a remarkable film thickness difference was confirmed between the central portion and the outer peripheral portion of the transfer pattern.

When the lighting display was confirmed about the display element produced as mentioned above, the light emission nonuniformity was confirmed.
Table 1 shows the panel lighting results of the example and the comparative example.

101 ... letterpress plate 102 ... plate cylinder 103 ... ink supply device 104 ... anilox roll 105 ... doctor blade 106 ... printed substrate 107 ... moving surface plate 108 ... plate cover

Claims (5)

A printing machine for printing a fine pattern on a substrate to be printed,
A moving surface plate for conveying the substrate to be printed;
A rotary plate cylinder disposed on the surface plate;
A relief plate arranged around the plate cylinder;
An anilox roll arranged to be a rotation axis in the same direction as the rotation axis of the plate cylinder,
An ink supply device for supplying ink to the anilox roll;
A mechanism for transferring the ink onto the relief plate by bringing the anilox roll and the relief plate into contact with each other;
A plate cover arranged to cover the periphery of the relief plate;
In a letterpress printing machine for transferring the ink transferred onto the letterpress in contact with the substrate to be printed,
The plate cover, the ink from the anilox roll until the transfer to the substrate to be printed through the transfer onto the relief plate, the ink is disposed in a region that is transferred onto the relief plate And a printing press detachable from the relief printing press. A printing machine for printing a fine pattern on a substrate to be printed,
A moving surface plate for conveying the substrate to be printed;
A rotary plate cylinder disposed on the surface plate;
A relief plate arranged around the plate cylinder;
An anilox roll arranged to be a rotation axis in the same direction as the rotation axis of the plate cylinder,
An ink supply device for supplying ink to the anilox roll;
A mechanism for transferring the ink onto the relief plate by bringing the anilox roll and the relief plate into contact with each other;
A plate cover arranged to cover the periphery of the relief plate;
In a letterpress printing machine for transferring the ink transferred to the letterpress in contact with the substrate to be printed,
The plate cover is disposed on the entire surface excluding a region where the ink is transferred from the anilox roll onto the relief plate and a region where the ink is transferred from the relief plate to the printing substrate , and is removable from the relief printing press. printing machine, characterized in that.   The printing press according to claim 1 or 2, wherein an inner surface of the plate cover has the same curvature as that of the relief plate arranged around the plate cylinder. The printing press according to any one of claims 1 to 3 , wherein a material of the plate cover is a metal. The printing press according to any one of claims 1 to 4 , wherein the plate cover has a mechanism for adjusting an area where the plate cover covers the relief plate.

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