JP5471506B2 - Flatbed sheet-fed printing press - Google Patents

Description

  The present invention relates to a flat sheet-fed printing press that transfers ink from a printing plate to a workpiece via a blanket unit.

  Conventionally, a frame, a printing platen that is placed on the frame and on which a printing plate is placed, and a workpiece (for example, an organic layer used for organic EL that is placed on the frame and placed on the frame) 2. Description of the Related Art A printing machine is known that includes a work surface plate on which a glass substrate, a film substrate, and the like) are placed, and a blanket unit having a blanket cylinder and a blanket wound around the blanket cylinder.

  A rack is provided on the side of the frame via a rack base, and a pinion that can be engaged with the rack is provided on the blanket cylinder. In such a printing press, the pinion can be rotated on the rack by rotating the blanket cylinder. Thereby, the blanket unit can move in the horizontal direction with respect to the frame, and at this time, ink (paint) is transferred from the blanket unit to the work (for example, see Patent Documents 1 and 2).

JP 2008-34490 A JP-A-5-69650

  In a conventional printing press, ink is filled on a printing plate with a member called a doctor. The doctor fills the ink on the printing plate in a state suitable for transfer to the blanket. Thereafter, the blanket moves on the printing plate, whereby the ink filled on the printing plate is transferred to the blanket. Then, when the ink is transferred from the blanket to the work, one printing process is completed.

  In this state, ink that has not been transferred to the work remains on the blanket. When the blanket is continuously used without removing the residual ink, the film thickness unevenness may occur due to the presence of the residual ink, and a uniform printed surface may not be obtained. Further, the ink that has not been transferred to the blanket remains on the printing plate. When the printing plate is continuously used without removing the residual ink, the film thickness unevenness occurs due to the presence of the residual ink, and there is a possibility that a uniform printed surface cannot be obtained.

  A blanket cleaning device for cleaning a blanket is known for removing residual ink on the blanket. The blanket cleaning by the blanket cleaning device requires a certain amount of time. It has been considered to take advantage of this time to remove the residual ink on the printing plate. However, only about 50% of the ink spread on the printing plate is transferred to the blanket. That is, it is not preferable to remove the residual ink on the printing plate at each printing step, because the ink use efficiency becomes 1/2 or less.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide a flat sheet-fed printing press capable of efficiently reusing residual ink on a printing plate.

  The present invention includes a printing platen on which a printing plate is placed, an ink supply device for supplying ink onto the printing plate placed on the printing platen, and a parallel movement while contacting the printing plate. A first doctor adapted to apply the ink supplied on the printing plate by the ink supply device to the printing plate, and can be rotated with respect to the printing plate after passing through the first doctor, and the blanket A blanket unit having a cylinder and a blanket wound around the blanket cylinder, and can be translated while contacting on the printing plate, and ink remaining on the printing plate after passing through the blanket unit is again applied to the printing plate. A second doctor adapted to be applied, and at the end of the printing plate, a printing plate inclined surface that is inclined downward from the other part of the printing plate is formed, and the second doctor It is possible to move while contacting the plate inclined surface, and the contact pressure of the second doctor to the printing plate is constant regardless of whether or not the contact part is on the printing plate inclined surface. This is a flatbed sheet-fed printing press characterized by

  According to the present invention, since the second doctor reapplies the ink remaining on the printing plate after passing through the blanket unit, the remaining ink on the printing plate can be efficiently reused. Specifically, based on the amount of ink that is scraped off by the second doctor and refilled into the printing plate, the amount of ink supplied from the ink supply device for the next printing step can be reduced. . This means that a significant cost reduction for the ink can be achieved.

  In addition, since the printing plate inclined surface that is inclined downward from the other part of the printing plate is formed at the end portion of the printing plate, the moving process when the blanket unit moves away from the printing plate can be smoothly performed with a simple configuration. Can be. In order to efficiently reuse the ink that has been moved to the printing plate inclined surface, the second doctor should be able to move while contacting the printing plate inclined surface. Even so, the contact pressure of the second doctor with respect to the printing plate is constant, so that the risk of damage to the second doctor and the printing plate is significantly reduced.

  Preferably, in the first doctor and the second doctor, the contact pressure with respect to the printing plate can be controlled by the air pressure, not the pushing amount. For example, a regulator may be incorporated in the first doctor and the second doctor in order to keep the contact pressure against the printing plate constant.

  Preferably, the parallel movement direction when the ink of the first doctor is applied to the printing plate and the parallel movement direction when the ink of the second doctor is applied again to the printing plate are opposite to each other. In this case, it is possible to adopt a mode in which both members are used by reciprocating. Thereby, the cost regarding the movement of both members can also be controlled. Specifically, for example, the first doctor and the second doctor can be provided in a common doctor unit in such a manner that the vertical position can be independently adjusted.

  Moreover, the contact part with respect to the printing plate of the 1st doctor has a taper surface inclined to the back side of the parallel movement direction at the time of applying the ink of the 1st doctor to the printing plate, and the ink of the 2nd doctor is used for the printing plate. It is preferable that the contact part with respect to the printing plate at the time of apply | coating to has a taper surface inclined in the back side of the parallel movement direction of the 2nd doctor. In this case, the ink filling into the printing plate is performed efficiently and with high quality.

  In order to maintain high print quality, it is preferable that a blanket cleaning unit for cleaning the blanket unit is provided. In this case, it is preferable that the second doctor is adapted to reapply ink remaining on the printing plate to the printing plate while the blanket washing unit is washing the blanket.

Further, it is preferable that the blanket cylinder and the blanket can be used as a flexographic plate by mounting the flexographic plate. In that case, so-called flexographic printing can be carried out. (It goes without saying that gravure offset printing can be carried out by attaching a normal sleeve or the like.)
The present patent application also seeks a method for manufacturing an organic EL element using a flat sheet-fed printing press having any of the above characteristics as a protection target.

  The present patent application also seeks an organic EL element manufactured using a flat sheet-fed printing press having any of the above characteristics as a protection target. The organic EL element manufactured using a flat sheet-fed printing press having any of the above characteristics has a physical property that the luminance half-life is extremely long as a proof of manufacture using such a printing press. It has been confirmed by the present inventor that

FIG. 1 is a diagram schematically showing a printing process by a flatbed sheet-fed printing press according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a residual ink processing step by a flatbed sheet-fed printing press according to an embodiment of the present invention. It is side sectional drawing which shows the example of the organic layer which comprises organic EL.

  FIG. 1 is a diagram schematically showing a printing process by a flatbed sheet-fed printing press according to an embodiment of the present invention. As shown in FIG. 1, a flat sheet-fed printing press according to an embodiment of the present invention includes a printing platen 16 that is placed on a frame (not shown) and on which a printing plate 21 is placed, And a work surface plate 17 on which the work 22 is placed.

  The organic layer used in organic EL and organic thin film transistors (organic TFTs) requires film uniformity. The flatbed sheet-fed printing press according to this embodiment can be used when such an organic layer is formed. For example, the workpiece 22 includes a substrate on which an organic layer used for the organic EL is placed. As such a workpiece 22, for example, a glass substrate on which nothing is placed, a glass substrate on which some organic layers used in organic EL or organic TFT are already placed, an insulating layer and an electrode ( Glass substrates on which ITO etc. are already mounted, film substrates on which nothing is mounted, film substrates on which some of the organic layers used in organic EL and organic TFTs are already mounted, and insulation A film substrate on which layers and electrodes (such as ITO) are already mounted can be used.

  Examples of the organic layer placed on the workpiece 22 such as a glass substrate or a film substrate include a light emitting layer 32, an electron transport layer 31, an intermediate layer 34, a hole injection / hole transport layer 35, and the like. (See FIG. 3). Here, the light emitting layer 32 has a thickness of about 80 nm, the intermediate layer 34 has a thickness of about 20 nm, and the hole injection / hole transport layer 35 has a thickness of about 80 nm. Hereinafter, a case where a glass substrate is used as the workpiece 22 and a film which is an organic layer constituting the organic EL is formed on the glass substrate 22 will be described as an example.

  Returning to FIG. 1, the flatbed sheet-fed printing press of this embodiment includes an ink supply device 26 that supplies ink onto a printing plate 21 placed on a printing platen 16. Further, a first doctor 11 is provided which is movable while being in contact with the printing plate 21 and is adapted to apply the ink supplied onto the printing plate 21 by the ink supply device 26 to the printing plate 21. ing.

  Further, the blanket unit is capable of rotating with respect to the printing plate 21 after passing through the first doctor 11 (described in detail later), and includes a blanket cylinder 41 and a blanket 42 wound around the blanket cylinder 41. 40 is provided (see FIG. 2).

  Further, there is provided a second doctor 12 that can move in parallel while contacting the printing plate 21 and is adapted to reapply ink remaining on the printing plate 21 after passing through the blanket unit 40 to the printing plate 21. It has been.

  In this Embodiment, the 1st doctor 11 and the 2nd doctor 12 are provided in the common doctor unit 13 in the aspect which can each move up and down independently (in the aspect which can adjust an up-and-down position). Specifically, the state where only the lower end position of the first doctor 11 protrudes to the lower end side (state of FIG. 1), and the state where only the lower end position of the second doctor 12 protrudes to the lower end side (state of FIG. 2) , Can be taken selectively.

  When the doctor unit 13 moves from left to right in FIG. 1, the first doctor 11 applies ink to the printing plate 21, and when the doctor unit 13 moves from right to left in FIG. 2 (see FIG. 2), the second doctor 12 applies the remaining ink to the printing plate 21 again. That is, the reciprocating movement of the doctor unit 13 is used without waste.

  Moreover, as shown in FIG.1 and FIG.2, the contact site | part with respect to the printing plate 21 of the 1st doctor 11 has the taper surface 11a inclined to the back side of the moving direction at the time of the ink application of the 1st doctor 11. As shown in FIG. Similarly, the contact portion of the second doctor 12 with respect to the printing plate 21 has a tapered surface 12a inclined to the rear side in the moving direction when the second doctor 12 is applied with ink. Thereby, the filling of the ink into the printing plate 21 by the doctors 11 and 12 is performed efficiently and with high quality.

  Further, the second doctor 12 includes a regulator and an air cylinder mechanism in order to keep the contact pressure with respect to the printing plate 21 constant. That is, it has a mechanism for supporting the contact pressure received by the contact portion with respect to the printing plate 21 with the air in the cylinder, and the air functions as a buffer medium that can be easily deformed, thereby absorbing the presence of irregularities on the printing plate 21. Thus, it is effectively prevented that an excessive pressure is instantaneously generated between the second doctor 12 and the printing plate 21.

  Further, for smooth separation and movement of the blanket 42 from the printing plate 21, a printing plate inclined surface 21 a that is inclined downward from the other part of the printing plate 21 is formed at the downstream end of the printing plate 21. . And the 2nd doctor 12 is comprised so that a movement is possible, contacting also on the printing plate inclined surface 21a. Here, the “downstream side” means the downstream side in the moving direction of the blanket unit 40 during the printing process (means the right side in FIGS. 1 and 2).

  Further, a blanket cleaning unit 45 for cleaning the blanket 42 is provided to remove ink remaining on the blanket 42 after the ink is transferred from the blanket 42 to the work 22. Then, the second doctor 12 again applies the ink remaining on the printing plate 21 to the printing plate 21 while the blanket cleaning unit 45 is cleaning the blanket 42 in accordance with the control of the printing press controller 50 including a computer or the like. It is designed to be painted.

  In addition, although illustration is abbreviate | omitted, the rack is provided in the side of the flame | frame via the rack base. The blanket cylinder 41 of the blanket unit 40 is provided with a pinion that can be engaged with the rack. Accordingly, by rotating the blanket cylinder 41 while utilizing the engagement between the pinion and the rack, the pinion rotates on the rack so that the blanket unit 40 can move in the horizontal direction with respect to the frame. It has become.

  Next, the operation of the printing press of the present embodiment having such a configuration will be described.

  First, ink is supplied onto the printing plate 21 placed on the printing platen 16 by the ink supply device 26.

  Next, the first doctor 11 descends from the retreat area above the printing plate 21 (in a non-contact state with the printing plate 21) under the control of the printing press control device 50, and comes into contact with the upper surface of the printing plate 21 ( At this time, the lower end position of the second doctor 12 is adjusted to be higher than the lower end position of the first doctor 11, and the second doctor 12 does not contact the upper surface of the printing plate 21). Then, under the control of the printing press control device 50, the first doctor 11 translates in a horizontal direction (from left to right in FIG. 1) at a substantially constant speed while contacting the printing plate 21, and the printing plate 21 The ink supplied above is applied to the printing plate 21 (ink is filled in the concave pattern portion of the printing plate 21). After passing through the concave pattern portion of the printing plate 21, the first doctor 11 rises again to the retreat area. In the present embodiment, all the movements of the first doctor 11 described above are performed integrally with the movement of the doctor unit 13.

  Next, with respect to the printing plate 21 after passing through the first doctor 11, the blanket unit 40 is controlled by the printing press control device 50 so that the retreat area above the printing plate 21 (in a state of non-contact with the printing plate 21). And comes into contact with the upper surface of the printing plate 21. At this time, the pinion of the blanket unit and the rack of the frame are engaged. When the blanket cylinder 41 is rotated, the pinion rotates on the rack, and the blanket unit 40 moves in the horizontal direction (rightward in FIG. 1) with respect to the frame. In the course of this movement, the ink on the printing plate 21 is transferred (received) onto the blanket 42.

  Thereafter, the blanket unit 40 leaves the printing plate 21 and reaches the work (glass substrate) 22 on the work surface plate 17. The provision of the printing plate inclined surface 21a when leaving the printing plate 21 prevents sudden force from being applied to the rack, and the blanket unit 40 moves smoothly.

  Then, the ink transferred (accepted) to the blanket 42 is transferred to the work 22 placed on the work surface plate 17. Thereby, the printing process (pattern transfer process) to the workpiece 22 is performed.

  After the printing process on the workpiece 22 is completed, the blanket unit 40 moves to a cleaning position by the blanket cleaning unit 45. After the movement of the blanket unit 40 is completed, the blanket cleaning unit 45 descends from the upper retreat area (a height at which the blanket 42 cannot be contacted) under the control of the printing press controller 50, Abuts the top surface. Then, the blanket 42 cleaning process by the blanket cleaning unit 45 is started.

  During the cleaning process of the blanket 42, the doctor unit 13 returns to the initial position as shown in FIG. During this return movement, the second doctor 12 descends from the retreat area above the printing plate 21 (in a non-contact state with the printing plate 21) under the control of the printing press control device 50, and the printing plate inclined surface 21a. (At this time, the lower end position of the first doctor 11 is adjusted to be higher than the lower end position of the second doctor 12, and the first doctor 11 does not contact the upper surface of the printing plate inclined surface 21a). . Then, under the control of the printing press controller 50, the second doctor 12 moves so as to climb the inclined surface 21a while being in contact with the upper surface of the printing plate inclined surface 21a, and further is in contact with the upper surface of the printing plate 21. The ink is moved in parallel in the horizontal direction (from right to left in FIG. 1) at substantially constant speed, and the ink remaining on the printing plate inclined surface 21a and the printing plate 21 is applied again to the printing plate 21 (printing plate 21). The ink is filled into the concave pattern portion of

  Here, the movement of the second doctor 12 ascending the printing plate inclined surface 21a is controlled by the printing press controller 50 according to the specific inclined shape of the printing plate inclined surface 21a. Due to the presence or the like, the actual movement trajectory of the second doctor 12 may be disturbed. However, in the present embodiment, since the regulator and the air cylinder mechanism are built in the second doctor 12, the air in the air cylinder mechanism absorbs the presence of unevenness due to the residual ink on the printing plate inclined surface 21a. Thus, it is effectively prevented that an excessive contact pressure is instantaneously generated between the second doctor 12 and the printing plate inclined surface 21a. Thereby, a possibility that the 2nd doctor 12 and the printing plate inclined surface 21a may be damaged is reduced significantly. Further, the effect of collecting (scraping) ink by the second doctor 12 is also smooth, which is preferable.

  Similarly, the horizontal movement on the printing plate 21 may be disturbed in the actual movement trajectory of the second doctor 12 due to the presence of residual ink or the like. However, in the present embodiment, since the regulator and the air cylinder mechanism are built in the second doctor 12, the air in the air cylinder mechanism absorbs the presence of unevenness due to the residual ink on the printing plate 21, and the like. It is effectively prevented that an excessive contact pressure is instantaneously generated between the second doctor 12 and the printing plate 21. Thereby, the possibility that the second doctor 12 and the printing plate 21 are damaged is significantly reduced. Further, the effect of collecting (scraping) ink by the second doctor 12 is also smooth, which is preferable. Furthermore, the effect of applying ink to the printing plate 21 by the second doctor 12 is also smooth, which is preferable.

  After passing through the concave pattern portion of the printing plate 21, the second doctor 12 rises to the retreat area and returns to the initial initial position. In the present embodiment, all the movements of the second doctor 12 described above are performed integrally with the movement of the doctor unit 13.

  In the present embodiment, in particular, the second doctor 12 can move while in contact with the printing plate inclined surface 21 a before the horizontal movement on the printing plate 21. Therefore, the ink moved to the printing plate inclined surface 21a by the first doctor 11 can be efficiently reused.

  As described above, according to the present embodiment, the second doctor 12 reapplies ink remaining on the printing plate 21 after passing through the blanket unit 40 to the printing plate 21. The remaining ink can be reused efficiently. Specifically, the amount of ink supplied from the ink supply device 26 for the next printing step is reduced based on the amount of ink scraped off by the second doctor 12 and refilled into the printing plate 21. be able to. Thereby, the remarkable cost reduction regarding ink can be aimed at.

  In addition, the printing plate inclined surface 21 a that is inclined downward from other portions of the printing plate 21 is formed at the end of the printing plate 21, so that the movement process when the blanket unit 40 leaves the printing plate 21 is performed. Even though it has a simple configuration, it can be realized extremely smoothly. Then, in order to efficiently reuse the ink that has been moved to the printing plate inclined surface 21a, the second doctor 12 can move while contacting the printing plate inclined surface 21a. Since the contact pressure of the doctor 12 with respect to the printing plate 21 is constant, the possibility that the second doctor 12 and the printing plate 21 (including the printing plate inclined surface 21a) are damaged is significantly reduced.

  Further, the step of applying ink to the printing plate 21 by the first doctor 11 and the step of applying ink again to the printing plate 21 by the second doctor 12 are performed by utilizing the reciprocating movement of the doctor unit 13, Costs related to the movement of both members can be suppressed.

  Further, the second doctor 12 reapplies the ink remaining on the printing plate 21 to the printing plate 21 while the blanket cleaning unit 45 is cleaning the blanket 42 under the control of the printing press controller 50. Yes. Therefore, the overall processing time can be shortened. Further, when the first doctor 11 and the second doctor 12 contact the ink on the printing plate 21 at an appropriate time interval, there is also a secondary effect of preventing the ink on the printing plate 21 from drying.

  Considering the effect of preventing the drying, after the ink is applied again by the second doctor 12, the ink application by the first doctor 11 and the ink application by the second doctor 12 are further performed during the cleaning process of the blanket 42. (The doctor unit 13 performs a further reciprocating motion without supplying new ink during the cleaning process of the blanket 42).

  In the above embodiment, the regulator and the air cylinder mechanism are incorporated only in the second doctor 12, but may be incorporated in the first doctor 11. In that case, the air in the air cylinder mechanism of the first doctor 11 absorbs the presence of unevenness due to the ink on the printing plate 21 and instantaneously excessively abuts between the first doctor 11 and the printing plate 21. The generation of pressure is effectively prevented. Thereby, the possibility that the first doctor 11 and the printing plate 21 are damaged is significantly reduced. In addition, the effect of applying ink to the printing plate 21 by the first doctor 11 becomes smooth. The air pressure of the air cylinder mechanism of the first doctor 11 and the air pressure of the air cylinder mechanism of the second doctor 12 do not need to be the same and can be adjusted individually. Furthermore, as a simpler aspect, a configuration in which the doctor unit 13 has a set of regulators and an air cylinder mechanism as a whole may be employed.

  The inventor of the present invention has confirmed that the organic EL element manufactured using the flatbed sheet-fed printing press of the present embodiment has a physical characteristic that the luminance half-life is extremely long. More specifically, when a red light emitting device was manufactured as gravure offset printing using this embodiment, a current efficiency of 0.82 Cd / A and a luminance half life of 10000 h could be achieved. This luminance half-life is much longer than when a similar device is manufactured by a spin coating method (current efficiency 0.8 Cd / A, luminance half-life 6000 h). Furthermore, when a red light emitting element was manufactured as flexographic printing using this embodiment, a current efficiency of 0.83 Cd / A and a luminance half life of 11000 h could be achieved.

DESCRIPTION OF SYMBOLS 11 1st doctor 11a Inclined surface 12 2nd doctor 12a Inclined surface 13 Doctor unit 16 Printing plate surface plate 17 Work surface plate 21 Printing plate 21a Printing plate inclined surface 22 Glass substrate (workpiece)
26 Ink supply device 31 Electron transport layer 32 Light emitting layer 34 Intermediate layer 35 Hole injection layer / hole transport layer 40 Blanket unit 41 Blanket cylinder 42 Blanket 45 Blanket cleaning unit 50 Printing machine controller

Claims (10)

A printing platen on which a printing plate is placed;
An ink supply device for supplying ink onto the printing plate placed on the printing platen;
A first doctor capable of translating while contacting on the printing plate and adapted to apply ink supplied onto the printing plate by an ink supply device to the printing plate;
A blanket unit capable of rotating with respect to the printing plate after passing through the first doctor and having a blanket cylinder and a blanket wound around the blanket cylinder;
A second doctor, which can be translated while in contact with the printing plate, and is adapted to reapply ink remaining on the printing plate after passing through the blanket unit to the printing plate;
With
At the downstream end of the printing plate, a printing plate inclined surface that is inclined downward from the upper surface on the upstream side of the printing plate is formed,
The second doctor can move while contacting even on the inclined surface of the printing plate,
A flat sheet-fed printing press characterized in that the contact pressure of the second doctor with respect to the printing plate is constant regardless of whether the contact portion is on the inclined surface of the printing plate. 2. The flatbed sheet-fed printing press according to claim 1, wherein the first doctor and the second doctor have a contact pressure to the printing plate controlled by an air pressure. The flatbed sheet-fed printing press according to claim 2, wherein the first doctor and the second doctor have a built-in regulator in order to keep the contact pressure to the printing plate constant. The translation direction of the first doctor when the ink is applied to the printing plate and the translation direction of the second doctor when the ink is applied again to the printing plate are opposite to each other. Item 4. A flat sheet-fed printing press according to any one of Items 1 to 3. 5. The flat table according to claim 1, wherein the first doctor and the second doctor are provided in a common doctor unit in a manner in which the vertical position can be independently adjusted. Sheet-fed printing machine. The contact portion of the first doctor with respect to the printing plate has a tapered surface inclined to the rear side in the parallel movement direction when the ink of the first doctor is applied to the printing plate,
The contact portion of the second doctor with respect to the printing plate has a tapered surface inclined to the rear side in the parallel movement direction when the ink of the second doctor is applied to the printing plate. Flatbed sheet-fed printing press according to any one of the above. The flatbed sheet-fed printing press according to any one of claims 1 to 6, further comprising a blanket cleaning unit for cleaning the blanket. 8. The flat plate according to claim 7, wherein the second doctor reapplies ink remaining on the printing plate to the printing plate while the blanket washing unit is washing the blanket. Leaf printing machine. The flatbed sheet-fed printing press according to any one of claims 1 to 8, wherein the blanket cylinder and the blanket can be used as a flexographic plate by mounting the flexographic plate. A method for producing an organic EL element, comprising using the flatbed sheet-fed printing press according to claim 1.

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