JP2010284829A - Offset printing method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an offset printing method improving accuracy in printing. <P>SOLUTION: A plate table 18 and a print object table 19 which are travelable through a guide rail 17, and an inking apparatus 30 and a transfer mechanism part 22 are provided on a frame 16. The plate table 18, a blanket roller 23 of the transfer mechanism part 22, and a blade holder 32 of the inking apparatus 30 are provided with temperature sensors 20, 26, 33 and temperature regulating mechanisms 21, 27, 34. A control device 35 gives commands to the respective temperature regulating mechanisms 21, 27, 34 based on signals inputted from the respective sensors 20, 26, 33 to carry out offset printing in a state of holding the temperature of blades 31 for pushing printing ink 29 into a plate 6 by the inking apparatus 30, the temperature of the plate 6 on the plate table 18 and the temperature of the blanket roller 23 to the temperatures at which the printing ink 29 has viscosity to obtain best printability. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an offset printing method and apparatus for printing a fine print pattern such as a fine electrode pattern using a paste such as a conductive paste as a printing ink.

  In recent years, as a method of forming an electrode pattern (conductive pattern) such as a liquid crystal display on a required substrate, a printing technique using a conductive paste as a printing ink instead of fine processing such as etching of a metal vapor deposition film, for example, A technique for printing and forming an electrode pattern on a substrate using an intaglio offset printing technique has been proposed (see, for example, Patent Document 1 and Patent Document 2).

  Further, nano inks using organic silver have attracted attention as a conductive paste suitable for fine printing. Since nano inks using organic silver are expensive, intaglio offset printing is attracting attention from the viewpoint of reducing the amount of wasted ink.

  FIG. 4 shows an outline of an example of a conventional offset printing apparatus using a flat plate. A guide rail 2 is provided on a base 1, and a slider 3 is provided on the guide rail 2. The guide rail 2 is provided so as to reciprocate.

  The slider 3 can be reciprocated so as to be positioned by a ball screw mechanism 4 connected to a drive motor 5.

  Further, a plate table 7 for holding the plate 6 and a printing target table (substrate holding table) 9 for holding a printing target 8 such as a liquid crystal glass substrate are arranged on the slider 3 in the longitudinal direction of the guide rail 2. They are arranged.

  A blanket roll 11 extending in a direction orthogonal to the linear guide rail 2, a rotational drive motor 12 for the blanket roll 11, and a required portion on the base 1 corresponding to the longitudinal intermediate portion of the guide rail 2, A transfer device 10 having a vertical drive motor 13 for raising and lowering the blanket roll 11 is provided.

  Further, a blade (supply squeegee) for inking ink (not shown) into a printing pattern of a plate 6 held on a plate table 7 that moves integrally with the slider 3 at a required portion of the base 1. ) 15 with an inking device 14.

  According to the offset printing apparatus having such a configuration, the slider 3 is moved via the ball screw mechanism 4 by the operation of the drive motor 5, and the plate held on the plate table 7 that moves integrally with the slider 3. 6 is sent to the inking device 14, and the inking device 14 inks the plate 6.

  Next, by moving the slider 3 through the ball screw mechanism 4 by the operation of the drive motor 5, the inked plate 6 on the plate table 7 and the printing target held on the printing target table 9 are displayed. 8 are sequentially guided to the transfer device 10. At this time, the blanket roll 11 rotated at a required speed by the operation of the rotation drive motor 12 in the transfer device 10 is operated by the operation of the vertical drive motor 13. The required contact pressure (printing pressure) is applied to the surface of the plate 6 that has been inked on the plate table 7 and the surface of the print target 8 on the print target table 9 by being lowered to the required height position. In this case, the ink is transferred (accepted) from the plate 6 to the blanket roll 11 and the ink is transferred again from the blanket roll 11 to the printing object 8. Thereby perform printing) are also available implement offset printing (e.g., see Patent Document 3).

  By the way, when the electrode pattern of the liquid crystal display or the like is formed on the substrate, a fine thin line of about 10 μm, for example, may be printed as the line width (electrode width). Since extremely high printing accuracy is required as compared with conventional general offset printing for printing, when performing offset printing using a paste such as the nano ink using organic silver as a printing ink, Viscosity management of the printing ink becomes important.

  As a method for adjusting and managing the viscosity (viscosity) of the printing ink, for example, the temperature and pH value of the printing ink in the tank are measured, and the temperature and pH value of the printing ink in the tank are appropriately managed. A technique for doing this has been proposed (see, for example, Patent Document 4).

Japanese Patent No. 2797567 Japanese Patent No. 3904433 Japanese Patent Laid-Open No. 9-70955 JP 2006-35587 A

  However, in the technique disclosed in Patent Document 4, the viscosity of the printing ink supplied from the tank to the ink pan in the printing apparatus of the type provided with the ink pan is adjusted by managing the viscosity of the printing ink in the tank. Even if it can be adjusted, when a conductive paste such as nano ink using organic silver is used as printing ink in the offset printing apparatus as shown in FIG. There is a problem that it is difficult to properly manage the viscosity of the printing ink provided, and therefore it is difficult to print a fine print pattern with high accuracy.

  That is, the conductive paste such as the nano ink using the organic silver has a characteristic that the viscosity is highly temperature-dependent. Therefore, the inking device 14 of the offset printing apparatus shown in FIG. 4 supplies printing ink having a high viscosity temperature dependency as described above onto the plate 6 and pushes it into the printing pattern of the plate 6 by the blade 15. When the temperature of the printing ink changes due to the influence of the temperature of the plate 6, the viscosity of the printing ink changes. With this change in viscosity, the inking of the printing ink into the plate 6 is appropriate. There is a concern that it may not be performed.

  Further, when the printing ink inked on the plate 6 is transferred (received) from the plate 6 to the blanket roll 11 by the transfer device 10 of the offset printing apparatus, it is affected by the temperature of the blanket roll 11. When the temperature changes, the viscosity of the printing ink filled in the printing pattern of the plate 6 changes. With this change in viscosity, the peelability of the printing ink from the plate 6 and the adhesion to the blanket roll 11 are changed. If the property is affected, there is a concern that the printing pattern may not be accurately reproduced during transfer (acceptance) from the plate 6 to the blanket roll 11.

  Further, when the viscosity is changed by changing the temperature under the influence of the temperature of the blanket roll 11, the peelability of the printing ink from the blanket roll 11 and the adhesion to the printing object 8 are affected. There is also a concern that the print pattern may not be accurately reproduced during retransfer (printing) from the blanket roll 11 to the printing object 8.

  However, the actual situation is that no idea has been proposed for managing the viscosity of the printing ink after it has been supplied from the tank to the offset printing apparatus.

  Therefore, the present invention can appropriately manage the viscosity of the printing ink when the printing ink supplied from the tank and inked into the plate is transferred (received) to the blanket roll by the offset printing apparatus. Furthermore, by accurately managing the viscosity of the printing ink that is retransferred (printed) from the blanket roll to the printing target, the reproducibility of the printing pattern printed on the printing target from the plate via the blanket roll is highly accurate. It is an object of the present invention to provide an offset printing method and apparatus that can be used.

  In order to solve the above-mentioned problem, according to the first aspect of the present invention, in accordance with claim 1, printing ink is inked by a inking device on a plate held on a plate table running on a guide rail on a gantry. Thereafter, a blanket roll that is moved up and down by a lifting drive mechanism in the transfer mechanism section is brought into contact with the inked plate on the plate table from above while being rotated by a rotation drive motor, and then the blanket Transfer of printing ink from the plate to the blanket roll and printing from the blanket roll to the printing object by bringing the roll into contact with the printing object held on the printing object table running on the guide rail from above An offset printing method in which retransfer of ink is performed, wherein the plate held on the plate table and the blanket roll In the state where the temperature of one or both of the ink is maintained at a temperature at which the printing ink becomes a viscosity at which good printability can be obtained, inking into the plate in the inking device, and in the transfer mechanism section An offset printing method is provided in which the printing ink is transferred from the plate to the blanket roll and the printing ink is transferred again from the blanket roll to the printing target.

  Further, in the above configuration, an inking device of a type provided with a blade for pushing printing ink into a printing pattern of a plate is used as the inking device, and the blade of the inking device has good printing ink. Inking into the plate is carried out while maintaining the temperature at which viscosity is obtained to obtain printability.

  Further, in each of the above configurations, a reserve tank for printing ink to be supplied to the inking device is provided, and the printing ink in the reserve tank is maintained at a viscosity and temperature at which the printing ink can obtain good printability. Then, the printing ink maintained at the viscosity and temperature capable of obtaining the good printability is supplied to the inking device so as to be inked into the plate.

  According to a fourth aspect of the present invention, there is provided an inking device that includes a plate table that runs on a guide rail on a gantry and a table to be printed, and that inks the plate held on the plate table. The blanket from the plate is brought into contact with the plate on the plate table and the printing target held on the printing target table sequentially from above with a blanket roll that is moved up and down by a lifting drive mechanism rotated by a driving motor for rotation. An offset printing apparatus comprising a transfer mechanism for transferring printing ink to a roll and re-transferring printing ink from a blanket roll to a printing object. In the offset printing apparatus, the plate mounting position on the plate table and the blanket roll A temperature sensor and a temperature adjustment mechanism are provided on one or both of the outer peripheral surfaces, and the plate table and the above Based on a temperature detection signal input from a temperature sensor provided at one or both of the predetermined positions of the lanquet roll, a command is sent to the corresponding temperature adjustment mechanism provided at one or both of the predetermined positions of the plate table and the blanket roll. And a function of maintaining the temperature of one or both of the plate attached to a predetermined portion of the plate table and the outer peripheral surface portion of the blanket roll at a temperature at which the printing ink has a viscosity at which good printability can be obtained. The offset printing apparatus has a configuration including the control device provided.

  Further, in the above configuration, the inking device is an inking device of a type having a blade for pushing printing ink into the printing pattern of the plate, and a temperature sensor and a temperature control are provided in the blade holder of the blade of the inking device. A mechanism is provided, and a command is given to the temperature adjusting mechanism of the blade holder based on a temperature detection signal input from the temperature sensor of the blade holder to the control device, and the temperature of the blade held by the blade holder is determined. The printing ink is configured to have a function of maintaining the temperature at which the printing ink becomes viscous to obtain good printability.

  Further, in each of the above-described configurations, the reserve tank for the printing ink supplied to the inking device is provided with a viscosity sensor, a temperature sensor, a temperature adjustment mechanism, and a diluent supply mechanism, and the control device further includes the reserve tank. Based on the signals input from the viscosity sensor and the temperature sensor, a command is given to the temperature adjustment mechanism and the dilution liquid supply mechanism, and the printing ink in the reserve tank is changed to a viscosity at which the printing ink can obtain good printability. And it is set as the structure provided with the function to hold | maintain to temperature.

According to the present invention, the following excellent effects are exhibited.
(1) A blanket roll that is moved up and down by a lifting drive mechanism in a transfer mechanism after inking printing ink on a plate held on a plate table running on a guide rail on a pedestal In a state rotated by a driving motor for rotation, the plate is in contact with the inked plate on the plate table from above, and then the blanket roll is held on the table to be printed running on the guide rail. In the offset printing method in which the printing ink is transferred from the plate to the blanket roll and the printing ink is transferred again from the blanket roll to the printing target by contacting the printing target from above. The temperature of one or both of the plate held on the table and the blanket roll is adjusted so that the printing ink is printed well. Ink in the plate in the inking device, transfer of printing ink from the plate to the blanket roll in the transfer mechanism, and a blanket roll As an offset printing method and apparatus that allows retransfer of printing ink from a printing object to a printing object, the ink is inked and transferred to a plate held on a plate table by an inking device. When transferring the printing ink from the inked plate to the blanket roll in the mechanism section (reception), and re-transferring the printing ink to the printing target held on the printing target table from the blanket roll (printing) When making the temperature of one or both of the plate and the blanket roll, the printing ink can obtain the best printability. By maintaining the temperature at which the printing property is maintained, at least the temperature of the printing ink when transferred from the plate to the blanket roll can be set to the temperature at which viscosity becomes the best printing property, The reproducibility of the printing pattern transferred from the plate to the blanket roll can be improved. Furthermore, when inking a plate on a plate table with an inking device, or when retransferring (printing) printing ink to a printing target on a printing target table from a blanket roll with a transfer mechanism. Thus, the temperature of the printing ink can be set to a temperature at which viscosity is obtained so as to obtain the best printability. Thereby, the reproducibility of the printing pattern printed on the printing object from the plate via the blanket roll can be made highly accurate.
(2) Therefore, even when a fine print pattern such as an electrode pattern is printed using a paste-like printing ink having a high viscosity temperature dependency such as a conductive paste, high accuracy without defects. Printing becomes possible.
(3) An inking device of a type provided with a blade for pushing printing ink into a printing pattern of a plate is used as the inking device, and the printing ink has good printability with the blade of the inking device. When inking the printing ink on the plate held on the plate table by the inking device by inking the plate while maintaining the temperature at which the viscosity is obtained. Since the printing ink in contact with the blade can be adjusted to a temperature at which viscosity is obtained to obtain good printability, printing is performed using the blade on the printing pattern of the plate with the inking device. The accuracy when ink is inked can be increased, and the printing accuracy can be improved.
(4) A reserve tank for printing ink to be supplied to the inking device is provided, and the printing ink in the reserve tank is maintained at a viscosity and temperature at which the printing ink can obtain good printability. By supplying printing ink maintained at a viscosity and temperature capable of obtaining printability to the inking device and causing the ink to be inked, the viscosity and temperature of the printing ink can be improved. Since it can be supplied to the inking device in an adjusted state and used for inking on the plate, the accuracy when inking the printing ink on the printing pattern of the plate with the inking device can be improved, It becomes possible to improve the printing accuracy.

1 is a schematic diagram illustrating an embodiment of an offset printing method and apparatus according to the present invention. It is a schematic diagram which shows the other form of implementation of this invention. It is a schematic diagram which shows other form of implementation of this invention. It is a schematic diagram which shows an example of the offset printing apparatus using the plate-shaped plate conventionally proposed.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows an application example in which a plate and an object to be printed are held in separate movement tables as an embodiment of the offset printing method and apparatus of the present invention.

  That is, a guide rail 17 extending in one direction is provided on the upper side of the horizontal base 16, and a plate table 18 that holds the plate 6 such as an intaglio on the upper surface of the guide rail 17, and printing of the substrate or the like A printing target table 19 for attaching and holding the target 8 on the upper surface portion can be slid through each guide block 17a in a state where the target rails are arranged in order from one end side (left side in FIG. 1) of the guide rail 17 in the longitudinal direction. In addition, the plate table 18 and the printing target table 19 can be independently reciprocated (traveled) along the guide rail 17 by an individual drive device (not shown) such as a linear motor.

  Further, a temperature sensor 20 for detecting the temperature of the plate 6 attached to the plate attachment location and a temperature of the plate 6 attached to the plate attachment location are changed at the plate attachment location on the upper surface of the plate table 18. A temperature control mechanism 21 such as a heater and a cooler is provided.

  A blanket roll 23 arranged to extend in a direction perpendicular to the longitudinal direction of the guide rail 17 above the guide rail 17 at a location corresponding to the longitudinal direction intermediate portion of the guide rail 17 on the gantry 16; A transfer mechanism unit 22 is provided that includes a rotation drive motor 24 for rotating the blanket roll 23 and a lift drive mechanism 25 for driving the blanket roll 23 up and down.

  Furthermore, a temperature sensor 26 for detecting the temperature of the outer peripheral surface portion that is brought into contact with the plate 6 or the printing object 8 and the outer peripheral surface portion that is brought into contact with the plate 6 or the printing object 8. A temperature adjusting mechanism 27 such as a heater and a cooler for changing the temperature of the heater is provided.

  Further, on the plate 6 held on the plate table 18 by a reserve tank (storage tank) 28 at a location on the gantry 16 that is closer to the required dimension toward the longitudinal end of the guide rail 17 than the transfer mechanism 22. An inking device 30 provided with a blade 31 for pushing the supplied printing ink 29 into the printing pattern of the plate 6 is provided, and the blade holder 32 holding the blade 31 in the inking device 30 has the blade A temperature sensor 33 for detecting the temperature of the blade 31 held in the holder 32 and a temperature adjusting mechanism 34 such as a heater and a cooler for changing the temperature of the blade 31 are provided.

  Further, temperature detection signals S1, S2, and S3 inputted from temperature sensors 20, 26, and 33 provided on the plate table 18, the blanket roll 23 of the transfer mechanism unit 22, and the blade holder 32 of the inking device 30, respectively. Based on the above, the plate table 18, the blanket roll 23, and the control device 35 that gives the temperature control commands C 1, C 2, and C 3 to the temperature adjustment mechanisms 21, 27, and 34 of the blade holder 32, respectively, are provided. Configure the device. In FIG. 1, for convenience of illustration, only one blade 31 and its blade holder 32 among the plurality of blades 31 provided in the inking device 30 are denoted by reference numerals (FIGS. 2 and 3 are also shown). The same). In addition, only the temperature sensor 33 and the temperature adjustment mechanism 34 mounted on the blade holder 32 to which the reference is attached are attached with reference numerals, and the temperature detection signal S3 and the temperature control command C3 are described.

  More specifically, the control device 35 acquires in advance correlation data between viscosity and temperature corresponding to the type of printing ink 29 used for offset printing, and is obtained by the temperature sensor 20 of the plate table 18. The temperature detection signal S1 of the temperature of the plate 6 held on the plate table 18 to be detected, the temperature detection signal of the temperature of the outer peripheral surface portion of the blanket roll 23 inputted from the temperature sensor 26 of the blanket roll 23, and the blade The temperature detection signal of the temperature of the blade 31 held in the blade holder 32 input from the temperature sensor 33 of the holder 32 is monitored, and the temperature of the plate 6 held on the plate table 18 and the outer circumference of the blanket roll 23 are monitored. The surface temperature and the temperature of the blade 31 held by the blade holder 32 are respectively derived from the correlation data. The temperature adjustment mechanism 21 of the plate table 18, the temperature adjustment mechanism 27 of the blanket roll 23, and the temperature of the blade holder 32 so as to coincide with the temperature at which the best printability of the ink 29 is obtained. A function for individually giving the temperature control commands C1, C2, C3 to the adjusting mechanism 34 is provided. Thus, the printing ink 29 is in contact with the plate 6 held on the plate table 18, the outer peripheral surface portion of the blanket roll 23 in the transfer mechanism portion, and the blade 31 held by the blade holder 32 in the inking device 30. Is maintained at a temperature at which the printing ink 29 becomes viscous to obtain the best printability.

  Further, the reserve tank 28 is provided with a viscosity sensor 36 and a temperature sensor 37 for detecting the viscosity and temperature of the printing ink 29 in the reserve tank 28, respectively, and a temperature adjusting mechanism 38 such as a heater and a cooler. And the supply mechanism 40 of the dilution liquid 39 is attached. The reserve tank 28 is not shown for making the temperature of the printing ink 29 stored therein uniform and for uniformly mixing the diluent 39 supplied from the diluent supply mechanism 40 into the printing ink 29. It is assumed that the mixing means is provided. A predetermined amount of printing ink 29 is periodically supplied to the outlet side of the reserve tank 28 when the plate 6 held on the plate table 18 is disposed at a predetermined position of the inking device 30. It is assumed that there is provided a supply means (not shown).

  Furthermore, based on the viscosity and temperature detection signals S4 and S5 of the printing ink 29 in the reserve tank 28 inputted from the viscosity sensor 36 and the temperature sensor 37 of the reserve tank 28 to the control device 35, the reserve The temperature adjusting mechanism 38 attached to the tank 28 and the function of giving the temperature control command C4 and the diluent supply command C5 to the diluent supply mechanism 40 are provided.

  Specifically, the control device 35 monitors the viscosity detection signal S4 of the printing ink 29 input from the viscosity sensor 36 of the reserve tank 28 and the temperature detection signal S5 of the printing ink 29 input from the temperature sensor 37. First, based on the correlation data between the viscosity and temperature corresponding to the type of the printing ink 29 described above, the temperature of the printing ink 29 determined by the temperature detection signal S5 is the best printing for the printing ink 29. The temperature control command C4 is given to the temperature adjusting mechanism 38 of the reserve tank 28 so as to coincide with the temperature at which the viscosity is obtained. As a result, the temperature of the printing ink 29 in the reserve tank 28 can be maintained at a temperature at which the viscosity is obtained to obtain the best printability.

  Further, the temperature of the printing ink 29 in the reserve tank 28 detected by the viscosity sensor 36 due to volatilization or the like under the condition that the printing ink 29 in the reserve tank 28 is appropriately maintained at the predetermined temperature. When the relationship is incorrect, that is, when the correlation data is out of the correlation data, the control device 35 gives the diluent supply command C5 to the diluent supply mechanism 40 and supplies the printing ink 29 with the required amount of diluent. By adding 39, the relationship between the viscosity of the printing ink 29 in the reserve tank 28 held at the predetermined temperature and the temperature conforms to the correlation data.

  41 is a plate table standby area in which the plate table 18 is moved to the one end in the longitudinal direction of the guide rail 17 to be on standby, and the plate 6 held on the plate table 18 can be exchanged, and 42 is a guide. In a state where the print target table 19 is moved to the other end in the longitudinal direction of the rail 17, the print target 8 to be newly printed is held on the print target table 19, and the print target 8 after the printing process is held. This is a print target installation area that can be removed.

  When using the offset printing apparatus of the present invention having the above configuration, first, the controller 35 controls the temperature adjusting mechanism 38 and the diluent supply mechanism 40 of the reserve tank 28 as described above, and The viscosity and temperature of the printing ink 29 in the reserve tank 28 are controlled so as to be the viscosity and temperature at which the best printability with the printing ink 29 is obtained.

  In the state where the plate 6 is held on the plate table 18 in the plate table standby area 41, the temperature control mechanism 21 of the plate table 18 is controlled by the control device 35 as described above, and the plate table 18 is moved. The temperature of the plate 6 is made to coincide with the temperature at which the printing ink 29 becomes viscous to obtain the best printability.

  Further, the control device 35 controls the temperature adjusting mechanisms 27 and 34 corresponding to the outer peripheral surface portion of the blanket roll 23 of the transfer mechanism portion 22 and the blade 31 held by the blade holder 32 of the inking device 30. Thus, the temperature is controlled so as to coincide with the temperature at which the printing ink 29 has a viscosity at which the best printability can be obtained.

  In this state, when the plate 6 held on the plate table 18 is sent to the inking device 30 by running of the plate table 18 and inking is performed, the printing supplied from the reserve tank 28 onto the plate 6 is performed. The ink 29, the plate 6, and the blade 31 for pushing the printing ink into the printing pattern of the plate 6 are all maintained at a temperature at which the printing ink 29 becomes viscous to obtain the best printability. Therefore, inking of the printing ink 29 to the plate 6 is performed satisfactorily.

  Thereafter, the plate table 18 holding the inked plate 6 passes through the transfer mechanism portion 22 and moves to a predetermined position closer to the other end in the longitudinal direction of the guide rail 17 than the transfer mechanism portion 22. Let me. In addition, the print target table 19 holds the print target 8 to be newly printed in the print target installation area 42.

  In this state, the transfer mechanism unit 22 starts the rotation of the blanket roll 23 by the rotation drive motor 24, and the lower part of the transfer mechanism unit 22 of the plate table 18 holding the inked plate 6 is below the blanket roll 23. The plate table 18 is started to travel to the position, and at this time, the peripheral speed of the blanket roll 23 and the moving speed of the plate on the plate table 18 accompanying the travel of the plate table 18 are kept synchronized. When the plate 6 passes under the blanket roll 23 by traveling 18, the blanket roll 23 is lowered by the lifting drive mechanism 25 and pressed against the plate 6 on the plate table 18 from above with the required contact pressure. To make contact. Thereby, the ink filled in the printing pattern of the inked plate 6 is transferred (accepted) to the surface of the blanket roll 23. At this time, the plate 6 on the plate table 18 and the outer peripheral surface portion of the blanket roll 23 are both maintained at a temperature at which the printing ink 29 becomes viscous to obtain the best printability. The transfer of the printing ink 29 from the plate 6 to the blanket roll 23 is performed satisfactorily, and the printed pattern is reproduced with high accuracy.

  After the transfer from the plate 6 on the plate table 18 to the blanket roll 23 is completed as described above, the plate 6 on the plate table 18 and the print target 8 held on the print target table 19 are connected. When the same processing is performed, retransfer (printing) to the printing object 8 is performed from the blanket roll 23. At this time, since the outer peripheral surface portion of the blanket roll 23 is maintained at a temperature at which the printing ink 29 becomes viscous to obtain the best printability, the printing ink 29 from the blanket roll 23 to the printing object 8 is maintained. Is re-transferred (printed) well, and the printed pattern is reproduced with high accuracy.

  As described above, according to the offset printing method and apparatus of the present invention, when the printing ink 29 provided for offset printing from the reserve tank 28 is inked into the plate 6 on the plate table 18 by the inking device 30, When the printing mechanism 29 is transferred (received) from the inked plate 6 to the blanket roll 23 by the transfer mechanism unit 22, the printing mechanism 8 is further applied to the printing target 8 on the printing target table 19 from the blanket roll 23. When the printing ink 29 is re-transferred (printed), the temperature of the printing ink 29 can be maintained at a temperature at which the best printability is obtained. Inking to printing plate 29 with printing ink 29, transfer from plate 6 to blanket roll 23 (acceptance), printing target from blanket roll 23 Retransfer to (printing) can be performed. Therefore, the releasability and adhesion of the printing ink 29 can be properly maintained, so that the reproducibility of the printing pattern printed on the printing object 8 from the plate 6 through the blanket roll 23 is made highly accurate. it can.

  Therefore, when performing offset printing of fine print patterns such as electrode patterns using paste-like printing ink with high viscosity temperature dependency such as conductive paste, high-precision printing without defects is performed. Can do.

  The present invention is not limited only to the above-described embodiment, and the reserve tank 28 is in a state where the heat capacity of the blade 31 of the inking device 30 is small and the temperature is adjusted to a predetermined temperature in advance by the reserve tank 28. Further, when the printing ink 29 supplied onto the plate 6 held on the plate table 18 is filled into the printing pattern of the plate 6 using the blade 31, the printing ink 29 is not touched even if the blade 31 is touched. When the temperature change is small and the change in viscosity can be ignored, the temperature sensor 33 and the temperature adjustment mechanism 34 of the blade holder 32 that holds the blade 31 in the inking device 30 are omitted, and the control device 35 performs the above operation. The temperature control of the blade 31 may be omitted.

  Furthermore, according to the heat capacity of the plate 6 held on the plate table 18 and the heat capacity of the blanket roll 23, as shown in FIG. 2, the temperature sensor 26 and the temperature adjustment mechanism of the blanket roll 23 of the transfer mechanism 22 are shown. 27, the control device 35 only controls the temperature of the plate 6 held on the plate table 18, so that the viscosity of the printing ink transferred (received) from the plate 6 to the blanket roll 23 ( The control device has a configuration in which the temperature sensor 20 and the temperature adjusting mechanism 21 of the plate table 18 are omitted as shown in FIG. 35, only the temperature control of the outer peripheral surface portion of the blanket roll 23 is performed, so that the blanket roll is removed from the plate 6 held on the plate table 18. Transferred to 23 (acceptance) printing ink to be viscous (peeling resistance, adhesion) may be allowed to hold the state obtained the best printability and.

  The plate table 18 and the printing target table 19 may be applied to an offset printing apparatus in which the plate table 18 and the printing target table 19 are reciprocally moved integrally on the guide rail 17.

  The transfer mechanism unit 22 rotates the blanket roll 23 at a peripheral speed synchronized with the moving speed of the plate 6 on the plate table 18 and the printing target 8 on the printing target table 19. The transfer mechanism section 22 having any type of rotation drive motor 24 or any type of lift drive mechanism 25 is provided as long as it can be sequentially contacted with a required contact pressure applied from above. It may be adopted.

  The inking device 30 may use any type of inking device 30 as long as it can appropriately ink the printing ink 29 onto the plate 6 held on the plate table 18. In this case, the number of blades 31 may be increased or decreased.

  When the printing ink 29 is transferred between the plate 6 and the blanket roll 11, the peelability of the printing ink 29 is more important in the plate 6, and the adhesion of the printing ink 29 is more important in the blanket roll 11. In view of this, the plate 6 and the blanket roll 11 may be held at different temperatures. Further, the blade 31 of the inking device 30 may be held at a temperature different from that of the plate 6.

  The offset printing method and apparatus of the present invention may be applied when performing offset printing on any print target 8 other than the substrate.

  Of course, various modifications can be made without departing from the scope of the present invention.

6 plate 8 print target 16 mount 17 guide rail 18 plate table 19 print target table 20 temperature sensor 21 temperature adjustment mechanism 22 transfer mechanism 23 blanket roll 24 rotation drive motor 25 lift drive mechanism 26 temperature sensor 27 temperature adjustment mechanism 28 reserve tank 29 Printing ink 30 Inking device 31 Blade 32 Blade holder 33 Temperature sensor 34 Temperature adjustment mechanism 35 Control device 36 Viscosity sensor 37 Temperature sensor 38 Temperature adjustment mechanism 39 Diluent 40 Diluent supply mechanism S1, S2, S3 Temperature detection signal S4 Viscosity Detection signal (signal)
S5 Temperature detection signal (signal)
C1, C2, C3, C4 Temperature control command (command)
C5 Diluent supply command (command)

Claims (6)

  After inking printing ink on the plate held on the plate table running on the guide rail on the gantry with the inking device, the transfer mechanism part rotates the blanket roll that can be moved up and down by the lifting drive mechanism A printing target that is brought into contact with the inked plate on the plate table from above while being rotated by a driving motor, and then the blanket roll is held on the printing target table running on the guide rail In the offset printing method in which the printing ink is transferred from the plate to the blanket roll, and the printing ink is transferred again from the blanket roll to the printing object by being brought into contact with the plate from above, on the plate table The temperature of one or both of the retained plate and the blanket roll is set so that the printing ink has good printability. In the state in which the temperature is maintained at the temperature at which the viscosity is generated, inking to the plate in the inking device, transfer of printing ink from the plate to the blanket roll in the transfer mechanism unit, and printing from the blanket roll An offset printing method characterized by causing reprinting of printing ink to the ink.   As the inking device, an inking device of a type having a blade for pushing printing ink into a printing pattern of a plate is used, and the blade of the inking device has a viscosity with which the printing ink can obtain good printability. The offset printing method according to claim 1, wherein inking into the plate is performed in a state where the temperature is maintained at a temperature at which   A reserve tank for printing ink to be supplied to the inking device is provided, and the printing ink in the reserve tank is maintained at a viscosity and a temperature at which the printing ink can obtain good printability. 3. The offset printing method according to claim 1 or 2, wherein the obtained printing ink maintained at the viscosity and temperature is supplied to an inking device and inked into a plate.   An inking device that includes a plate table that runs on a guide rail on a gantry and a printing target table and inks the plate held on the plate table, the plate on the inked plate table, and the printing target table Transfer of printing ink from the plate to the blanket roll and the blanket roll by bringing the blanket roll, which is moved up and down by the lifting drive mechanism, into contact with the printing object held on the printing plate sequentially from above while being rotated by the rotation drive motor In the offset printing apparatus comprising a transfer mechanism for retransferring the printing ink from the printing object to the printing object, a temperature sensor is provided at one or both of the plate mounting position on the plate table and the outer peripheral surface of the blanket roll. And a temperature control mechanism, and further, a predetermined of the plate table and the blanket roll Based on a temperature detection signal input from a temperature sensor provided at one or both of the locations, a command is given to a corresponding temperature adjustment mechanism provided at one or both of the plate table and the predetermined location of the blanket roll, and A control device having a function of maintaining the temperature of one or both of the plate attached to a predetermined portion of the plate table and the outer peripheral surface portion of the blanket roll at a temperature at which the printing ink becomes viscous to obtain good printability. An offset printing apparatus having a configuration comprising:   The inking device is an inking device of a type having a blade for pushing printing ink into a printing pattern on a plate, and a blade sensor of the blade of the inking device is provided with a temperature sensor and a temperature adjusting mechanism, and Based on the temperature detection signal input from the temperature sensor of the blade holder to the controller, a command is given to the temperature adjustment mechanism of the blade holder so that the temperature of the blade held by the blade holder The offset printing apparatus according to claim 4, wherein the offset printing apparatus has a function of maintaining a temperature at which viscosity is obtained to obtain printability.   The reserve tank for printing ink supplied to the inking device is provided with a viscosity sensor, a temperature sensor, a temperature adjustment mechanism, and a dilution liquid supply mechanism, and further input to the control device from the viscosity sensor and temperature sensor of the reserve tank. The temperature control mechanism and the dilution liquid supply mechanism are instructed based on the signal to maintain the printing ink in the reserve tank at a viscosity and temperature at which the printing ink can obtain good printability. The offset printing apparatus according to claim 4 or 5, wherein the offset printing apparatus is configured as described above.

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