JP2011051107A - Dryer and printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dryer and a printing machine, both combined in use for the improvement of print quality by suppressing uneven drying and at the same time, restraining an increase in finished product manufacturing cost. <P>SOLUTION: This dryer 14 is configured of a paper supply part 11, a printing part 12 and a paper discharge part 13 arranged in series, and also, is installed downstream in the conveyance direction of a printing paper S at the printing part 12. In addition, as the dryer 14, a first ultraviolet irradiation device 51 is installed which irradiates a preset specified region with ultraviolet light having a preset light energy, to an ultraviolet-curable ink for the printing paper S. Also, a second ultraviolet irradiation device 52 is also installed which irradiates a wider irradiation region than the irradiation region by the first ultraviolet irradiation device 51 with the ultraviolet light having lower light energy than that by the first ultraviolet irradiation device 51, to the ultraviolet-curable ink for the printing paper S. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drying device that dries a coating material such as ink or a coating material transferred to a printing sheet, and a printing machine equipped with the drying device.

  A printing apparatus for an offset sheet-fed printing press includes a paper feeding unit, a printing unit, and a paper discharge unit. Therefore, the print sheets stacked on the paper feed tray are sucked by the paper feed section and sent forward, and after a predetermined printing is performed by the print section, they are stacked on the paper discharge tray by the paper discharge section. The paper is ejected.

  In this offset sheet-fed printing press, ink is transferred to the printing surface of the printing sheet in the printing section. As a drying device for drying the ink, an ultraviolet irradiation device that irradiates ultraviolet rays is used. In this case, various types of ultraviolet irradiation devices using light emitting diodes (LEDs) have been proposed from the viewpoints of power consumption, heat generation, lifetime, and compact size. However, when an ultraviolet irradiation device, that is, a drying device is configured by light emitting diodes, a plurality of light emitting diodes are linearly arranged in the width direction of the printing sheet. Since one light emitting diode has a narrow irradiation area (irradiation angle) where effective illuminance is obtained, irradiation energy varies in the width direction simply by arranging them in a straight line, making it difficult to dry UV ink. There is a risk of uneven drying. In particular, such a phenomenon is likely to occur when the ink film thickness is thick or the printing speed is fast.

  As what solves such a problem, what was described in the following patent document, for example is proposed. In the ink jet recording apparatus described in Patent Document 1, unit cases are arranged on both sides of an ink discharge portion in an ink jet head, and light emitting diodes are arranged in a staggered manner along the moving direction of the recording paper in the unit case. Yes. In the ultraviolet irradiation apparatus described in Patent Document 2, three rows of semiconductor light emitting elements are arranged on the element supporting means along the width direction of the printing paper in the ink jet printer. Furthermore, in the printing machine described in Patent Document 3, a plurality of UV light emitting diodes are combined in a UV drying apparatus so that their irradiation areas are related to each other, thereby forming a substantially uniform irradiation area in the width direction. It is arranged to do.

JP 2005-104108 A JP 2006-027235 A JP 2008-207369 A

  When the ultraviolet curable ink is irradiated with ultraviolet rays and dried, the ultraviolet rays to be irradiated require light energy necessary for the ink to cure. For this reason, it is desirable to arrange the light emitting diode as close as possible to the printing surface of the printing sheet. However, since the light emitting diode has a narrow irradiation area (irradiation angle), the irradiation energy varies in the width direction, and drying unevenness occurs. As in each of the above-mentioned patent documents, an irradiation region in which sufficient irradiation energy is ensured can be obtained by arranging a plurality of light emitting diodes in a staggered manner or in a plurality of rows, but a very large number of light emission There is a problem that a diode is required, resulting in an increase in cost.

  The present invention solves the above-described problems, and aims to provide a drying device and a printing machine that can improve the printing quality by suppressing drying unevenness of a coating material and can suppress an increase in product cost. To do.

  In order to achieve the above object, the drying device of the present invention is a drying device that irradiates and cures an ultraviolet curable coating material transferred to a printing surface of a printing sheet by ultraviolet irradiation. First ultraviolet irradiation means for irradiating a predetermined region with ultraviolet light having light energy set in advance toward the material, and ultraviolet light by the first ultraviolet irradiation means toward the ultraviolet curable coating material of the print sheet And a second ultraviolet irradiation means for irradiating an irradiation area wider than an irradiation area by the first ultraviolet irradiation means with lower ultraviolet energy.

  In the drying apparatus of the present invention, the first ultraviolet irradiation unit and the second ultraviolet irradiation unit are configured by arranging a plurality of light emitting diodes linearly along a direction intersecting a conveyance direction of the print sheet. One ultraviolet irradiation means is arranged upstream of the second ultraviolet irradiation means in the conveyance direction of the print sheet.

  In the drying apparatus of the present invention, the first ultraviolet irradiation means is configured by arranging a plurality of light emitting diodes linearly along a direction intersecting a conveyance direction of the print sheet, and the second ultraviolet irradiation means includes the The light emitting diodes are arranged in a ring shape around the light emitting diodes constituting the first ultraviolet irradiation means.

  In the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means and the plurality of light emitting diodes constituting the second ultraviolet irradiation means have the same light emission energy, while the first ultraviolet light is included. The irradiation means is arranged closer to the print sheet than the second ultraviolet irradiation means.

  In the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means have a larger emission energy than the plurality of light emitting diodes constituting the second ultraviolet irradiation means, while the first ultraviolet light is emitted. The irradiation means and the second ultraviolet irradiation means are arranged at the same distance from the print sheet.

  In the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means are arranged to be inclined at a predetermined angle with respect to a direction orthogonal to the print sheet conveyance direction.

  The printing machine of the present invention is a printing machine in which a paper feeding unit, a printing unit, and a paper discharge unit are arranged in series, and a drying device is arranged on the downstream side in the conveyance direction of the print sheet in the printing unit. First ultraviolet irradiation means for irradiating an ultraviolet ray having light energy set in advance toward the ultraviolet curable coating material of the printing sheet onto a predetermined area, and toward the ultraviolet curable coating material of the printing sheet And a second ultraviolet irradiation means for irradiating an irradiation area wider than an irradiation area by the first ultraviolet irradiation means with an ultraviolet energy having lower light energy than the ultraviolet radiation by the first ultraviolet irradiation means.

  According to the drying apparatus of the present invention, the first ultraviolet irradiation means for irradiating the predetermined region with the ultraviolet ray having the preset light energy toward the ultraviolet curable coating material of the print sheet, Second ultraviolet irradiation means for irradiating an ultraviolet ray having a light energy lower than that of the ultraviolet ray emitted from the first ultraviolet ray irradiation means to an irradiation area wider than the irradiation area of the first ultraviolet ray irradiation means toward the ultraviolet curable coating material. Accordingly, the ultraviolet light energy from the first ultraviolet irradiation means acts in a spot manner on the ultraviolet curable coating material of the printing sheet, whereby the curing of the ink is started, and the ultraviolet light from the second ultraviolet irradiation means is started. As the light energy acts on the UV curable coating material of the printing sheet as a whole, the ink in all regions is cured, and it is possible to improve the printing quality by suppressing drying unevenness. It is possible to suppress an increase in product cost.

  According to the drying apparatus of the present invention, the first ultraviolet irradiation unit and the second ultraviolet irradiation unit are configured by arranging a plurality of light emitting diodes linearly along a direction intersecting the conveyance direction of the print sheet. Since the ultraviolet irradiation means is arranged upstream of the second ultraviolet irradiation means in the conveyance direction of the print sheet, the ink is cured by the high light energy from the first ultraviolet irradiation means, and the wide range from the second ultraviolet irradiation means is reached. The ink is cured as a whole by the light energy spreading to the ink, and uneven drying of the ink can be appropriately suppressed.

  According to the drying apparatus of the present invention, the first ultraviolet irradiation means is configured by arranging a plurality of light emitting diodes in a straight line along the direction intersecting the conveyance direction of the print sheet, and the second ultraviolet irradiation means Since the light emitting diodes are arranged in a ring shape around the light emitting diode of one ultraviolet irradiation means, it is not necessary to arrange a plurality of light emitting diodes in two rows as two ultraviolet irradiation means, and the apparatus can be miniaturized. can do.

  According to the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means and the plurality of light emitting diodes constituting the second ultraviolet irradiation means have the same emission energy, and the first ultraviolet irradiation means Is arranged closer to the printing sheet than the second ultraviolet irradiation means, and by making each light emitting diode the same, it is possible to reduce the cost by sharing the parts.

  According to the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means have larger light emission energy than the plurality of light emitting diodes constituting the second ultraviolet irradiation means, Since the second ultraviolet irradiation means is arranged at the same distance from the printing sheet, the apparatus can be made compact by arranging the respective light emitting diodes at the same distance from the printing sheet.

  According to the drying apparatus of the present invention, the plurality of light emitting diodes constituting the first ultraviolet irradiation means are arranged at a predetermined angle with respect to the direction orthogonal to the conveyance direction of the print sheet, so the conveyance direction of the print sheet The distance between the respective light emitting diodes in the direction orthogonal to can be shortened, and the arrangement of the plurality of light emitting diodes can be simplified.

  According to the printing machine of the present invention, the paper feeding unit, the printing unit, and the paper discharge unit are arranged in series, and the drying device is arranged on the downstream side in the printing sheet conveyance direction in the printing unit. First ultraviolet irradiation means for irradiating an ultraviolet ray having light energy set in advance toward the ultraviolet curable coating material of the printing sheet onto a predetermined area, and toward the ultraviolet curable coating material of the printing sheet There is provided a second ultraviolet irradiation means for irradiating the irradiation area wider than the irradiation area by the first ultraviolet irradiation means with ultraviolet light having a light energy lower than that of the ultraviolet light by the first ultraviolet irradiation means. Accordingly, the ultraviolet light energy from the first ultraviolet irradiation means acts in a spot manner on the ultraviolet curable coating material of the printing sheet, whereby the curing of the ink is started, and the ultraviolet light from the second ultraviolet irradiation means is started. As the light energy acts on the UV curable coating material of the printing sheet as a whole, the ink in all regions is cured, and it is possible to improve the printing quality by suppressing drying unevenness. It is possible to suppress an increase in product cost.

FIG. 1 is a schematic configuration diagram illustrating an offset sheet-fed printing press according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a paper discharge unit of the offset sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating a drying apparatus according to the first embodiment. FIG. 4 is a front view illustrating the drying apparatus according to the first embodiment. FIG. 5 is a side view illustrating the drying apparatus according to the first embodiment. FIG. 6 is a graph showing the integrated light quantity in the paper length direction in the drying apparatus of Example 1. FIG. 7 is a graph showing the integrated light quantity in the paper width direction in the drying apparatus of Example 1. FIG. 8 is a schematic diagram illustrating a drying apparatus according to Embodiment 2 of the present invention. FIG. 9 is a front view illustrating a drying apparatus according to the second embodiment. FIG. 10 is a front view illustrating a drying apparatus according to Embodiment 3 of the present invention. FIG. 11 is a schematic diagram illustrating a drying apparatus according to Example 4 of the present invention. FIG. 12 is a schematic diagram illustrating a drying apparatus according to Embodiment 5 of the present invention.

  Exemplary embodiments of a drying apparatus and a printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic configuration diagram illustrating an offset sheet-fed printing press according to a first embodiment of the present invention, FIG. 2 is a schematic diagram illustrating a paper discharge unit of the offset sheet-fed printing press according to the first embodiment, and FIG. FIG. 4 is a front view showing the drying apparatus of the first embodiment, FIG. 5 is a side view showing the drying apparatus of the first embodiment, and FIG. 6 is a drying apparatus of the first embodiment. FIG. 7 is a graph showing the integrated light quantity in the paper width direction in the drying apparatus of Example 1.

  As shown in FIG. 1, the offset sheet-fed printing machine according to the first embodiment includes a paper feeding unit 11, a printing unit 12, and a paper discharge unit 13 arranged in series in the conveyance direction of the printing paper (printing sheet) S. A drying device 14 is disposed in the paper discharge unit 13. In this case, the printing unit 12 includes five printing units 12a, 12b, 12c, 12d, and 12e.

  In the printing machine having the above-described structure, when the printing paper S is supplied from the paper supply unit 11 to the printing unit 12, the printing unit 12 uses five colors of ink (for example, cyan, magenta, yellow, black, and gold). Are transferred to the surface of the printing paper S, which is the printing surface, via the plate cylinder and the blanket cylinder for each of the printing units 12a, 12b, 12c, 12d, and 12e. Then, the printing paper S on which the front surface is printed is discharged by the paper discharge unit 13. In this case, the ink is an ultraviolet curable ink (ultraviolet curable coating material) that dries and solidifies when irradiated with ultraviolet rays, so-called UV ink.

  As shown in FIG. 2, the paper discharge unit 13 in the offset sheet-fed printing press according to the first embodiment configured as described above conveys the print sheets S printed by the printing unit 12 and stacks them in an aligned state. is there. The paper discharge unit 13 is disposed above the first paper discharge cylinder 21 and the second paper discharge cylinder 22 that can hold and convey the leading edge of the printing paper S, and the second paper discharge cylinders 21 and 22. A chain gripper mechanism (conveying mechanism) 23 capable of holding and conveying the leading end of the printing paper S received from the paper discharging cylinder 22 and a paper discharging tray 24 on which the printing paper S conveyed by the chain gripper mechanism 23 are stacked. is doing.

  The first paper discharge cylinder 21 is located downstream of the impression cylinder (print cylinder) 20 in the printing unit 12 in the conveyance direction of the print sheet S, and is disposed in contact with the impression cylinder 20. The first paper discharge cylinder 21 can be rotated clockwise in FIG. 2 by a driving device (not shown), and two gripping claws 21a capable of holding the front end portion of the print sheet S on the outer peripheral portion. , 21b are provided at equal intervals in the circumferential direction. On the other hand, the second paper discharge drum 22 is located downstream of the first paper discharge drum 21 in the transport direction of the print sheet S, and is disposed in contact with the first paper discharge drum 21. The second paper discharge drum 22 can be rotated counterclockwise in FIG. 2 by a driving device (not shown), and two gripping claws that can hold the front end of the print sheet S on the outer periphery. 22a and 22b are provided at equal intervals in the circumferential direction.

  The impression cylinder 20 can be rotated counterclockwise in FIG. 2 by a driving device (not shown), and two gripping claws 20a and 20b capable of holding the front end portion of the print sheet S on the outer peripheral portion. It is provided at equal intervals in the circumferential direction. In this case, the pressure drum 20, the first paper discharge drum 21, and the second paper discharge drum 22 are rotatably supported at their shaft ends by a frame (not shown), and the above-mentioned rotation direction is adjusted by the same driving device in accordance with the printing operation. It can be rotated. However, the pressure drum 20, the first paper discharge cylinder 21, and the second paper discharge cylinder 22 can be rotated in the reverse direction by the driving device according to the type of work.

  The chain gripper mechanism 23 is disposed so as to be spanned from the second paper discharge drum 22 to the paper discharge tray 24 above. That is, a first sprocket 25 is supported above the second paper discharge drum 22 so as to be able to rotate, and a second sprocket 26 having a smaller diameter than the first sprocket 25 is rotatably supported above the paper discharge table 24. An endless chain 27 is hung around each sprocket 25, 26. The chain 27 is supported by a chain guide 28, and a plurality of grippers 29 are mounted at predetermined intervals in the longitudinal direction. The gripper 29 has a gripping bar 29a connected to the chain 27, and a claw portion 29b that sandwiches the front end of the printing paper S with the gripping bar 29a. When it comes above 24, the claw part 29b is released.

  A belt guide mechanism 31 that guides the print sheet S that travels along the transport direction of the print sheet S and is transported by the chain gripper mechanism 23, and a downward airflow above the sheet discharge table 24. A fan device 32 to be formed and a vacuum suction wheel device 33 for reducing the speed of the printing paper S conveyed by the chain gripper mechanism 23 on the upstream side from the paper discharge table 24 are provided.

  The belt guide mechanism 31 is disposed below the chain gripper mechanism 23 and between the second discharge cylinder 22 and the discharge table 24. The belt guide mechanism 31 is stretched around a driving roller 41 that can be driven to rotate, a plurality of driven rollers 42 that are rotatably driven by the driving roller 41, and the driving rollers 41 and the plurality of driven rollers 42. And an endless belt 43. The endless belt 43 has a width larger than the width of the printing paper S, and at a portion facing the chain gripper mechanism 23, the speed of the printing paper S conveyed by the chain gripper mechanism 23 along the conveyance direction of the printing paper S is determined. It is provided so that it can circulate at the same speed.

  The fan device 32 has a plurality of fans arranged in a substantially rectangular shape, and presses the printing paper S conveyed by the chain gripper mechanism 23 above the paper discharge tray 24 downward in the vertical direction by an air current. The vacuum suction wheel device 33 is disposed between the belt guide mechanism 31 and the paper discharge table 24, and after the chain gripper mechanism 23 releases the printing paper S, a suction force is applied to the rear end portion of the printing paper S. The printing paper S is braked and the posture is controlled.

  In this case, the first discharge cylinder 21, the second discharge cylinder 22, and the chain gripper mechanism 23 (first sprocket 25) are arranged in series from the bottom to the top.

  Accordingly, as shown in FIGS. 1 and 2, the printing paper S printed by the printing unit 12 is in a state where the front end is held by the gripping claws 20a (20b) of the impression cylinder 20 in the printing unit 12e. Then, the paper is conveyed to the paper discharge unit 13. In the paper discharge unit 13, first, the gripping claw 21 a (21 b) of the first paper discharge cylinder 21 receives and conveys the printing paper S conveyed by the impression cylinder 20, and then the second paper discharge cylinder 22. The gripping claw 22 a (22 b) receives and transports the printing paper S transported by the first paper discharge cylinder 21, and is delivered to the chain gripper mechanism 23. In this chain gripper mechanism 23, the gripper 29 receives the printing paper S conveyed by the second paper discharge drum 22, and the chain 27 moves while the gripper 29 holds the front end portion of the printing paper S. The printing paper S is transported to the paper discharge tray 24, and the holding of the printing paper S by the gripper 29 is released and stacked on the paper discharge tray 24. At this time, the endless belt 43 circulating in the belt guide mechanism 31 travels in the traveling direction along the transport direction of the printing paper S below the chain gripper mechanism 23, so that the front end portion is held by the gripper 29. The printing paper S is supported from below to guide its conveyance.

  In the paper discharge unit 13 configured in this manner, a drying device 14 is disposed so as to dry the UV ink transferred to the printing paper S by irradiating ultraviolet rays so as to face the outer peripheral surface of the second paper discharge drum 22. ing. The drying device 14 is disposed so as to face the second paper discharge cylinder 22 that is disposed apart from the impression cylinder 20 by a predetermined distance set in advance. The drying device 14 includes a first ultraviolet irradiation device 51 that irradiates ultraviolet rays having light energy set in advance toward the UV ink of the printing paper S onto a predetermined area, and UV ink of the printing paper S. The second ultraviolet irradiation device 52 is configured to irradiate the irradiation region wider than the irradiation region by the first ultraviolet irradiation device 51 with ultraviolet light having lower light energy than the ultraviolet rays from the first ultraviolet irradiation device 51.

  In the drying device 14, as shown in FIGS. 3 to 5, a housing 53 having a U-shaped cross section facing the outer peripheral surface of the second paper discharge drum 22 extends in the axial direction of the second paper discharge drum 22. The housing 53 is supported by a frame (not shown) of the paper discharge unit 13 via a mounting bracket 54. The housing 53 is provided with a first ultraviolet irradiation device 51 and a second ultraviolet irradiation device 52. In the present embodiment, the first ultraviolet irradiation device 51 is disposed upstream of the second ultraviolet irradiation device 52 in the transport direction of the printing paper S.

  A case 55 fixed to the housing 53 by the first ultraviolet irradiation device 51 has a plurality of light emitting diodes (LEDs: Light) along a direction intersecting (in the present embodiment, orthogonal) to the transport direction of the printing paper S. (Emitting Diode) 56 is arranged in a straight line in one row. The light emitting diode 56 can irradiate ultraviolet rays (UV: Ultraviolet) and is provided corresponding to the entire area in the axial direction of the second paper discharge cylinder 22, that is, the width direction of the printing paper S. The light emitting diodes 56 constituting the first ultraviolet irradiation device 51 are arranged at a predetermined distance L1 with respect to the printing surface of the printing paper S, so that the relatively high light energy of ultraviolet rays is applied to the printing paper. It is possible to irradiate with a spot toward a predetermined region toward the UV ink of S.

  On the other hand, the case 57 fixed to the housing 53 by the second ultraviolet irradiation device 52 has a plurality of light emitting diodes (LEDs) along a direction intersecting (in the present embodiment, orthogonal) to the transport direction of the printing paper S. ) 58 are arranged in a straight line in one row. The light emitting diode 58 can irradiate ultraviolet rays (UV), and is provided corresponding to the entire area in the axial direction of the second paper discharge drum 22, that is, the width direction of the printing paper S. The respective light emitting diodes 58 constituting the second ultraviolet irradiation device 52 are arranged with a predetermined distance L2 away from the printing surface of the printing paper S, so that the relatively low light energy of the ultraviolet rays is applied to the printing paper. It is possible to diffuse and irradiate toward a predetermined area toward the UV ink of S.

  That is, in this embodiment, each light emitting diode 56 constituting the first ultraviolet irradiation device 51 and each light emitting diode 58 constituting the second ultraviolet irradiation device 52 are set to have the same light emission energy. The first ultraviolet irradiation device 51 (light emitting diode 56) is arranged closer to the printing paper S by the distance L2-L1 than the second ultraviolet irradiation device 52 (light emitting diode 58). As a result, the UV ink of the printing paper S receives ultraviolet light having high light energy from the light emitting diode 56 of the first ultraviolet irradiation device 51 in a narrow range. On the other hand, since the light emitting diode 58 of the second ultraviolet irradiation device 52 is far from the printing paper S and the ultraviolet rays diffuse at a predetermined irradiation angle, the UV ink of the printing paper S is emitted from the light emitting diode 58 of the second ultraviolet irradiation device 52. Will receive ultraviolet light having low light energy in a wide range.

  Note that the positions of the light emitting diodes 56 of the first ultraviolet irradiation device 51 and the positions of the light emitting diodes 58 of the second ultraviolet irradiation device 52 are shifted from each other by a predetermined distance in the width direction of the printing paper S. That is, the light emitting diodes 58 are arranged in a staggered manner so that the light emitting diodes 58 are positioned between the light emitting diodes 56 in the width direction of the printing paper S. In this case, each of the light emitting diodes 56 and 58 is housed in the cases 55 and 57. For example, the light emitting diodes 56 and 58 are formed in blocks of five light emitting diodes 56 and 58, and can be assembled in units of blocks. It has become.

  More specifically, as shown in FIG. 6, the first ultraviolet irradiation device 51 is arranged on the upstream side in the conveyance direction of the printing paper S, and the second ultraviolet irradiation device 52 is arranged on the downstream side. 6 is the longitudinal direction (time) of the printing paper S, and the right side of FIG. 6 is the downstream side. As can be seen from the graph of FIG. 6, the UV ink of the printing paper S narrows ultraviolet rays having high light energy Ea from the light emitting diode 56 of the first ultraviolet irradiation device 51 at the position A in the longitudinal direction of the printing paper S. Received in the irradiation area Wa. Thereafter, at a position B in the longitudinal direction of the printing paper S, ultraviolet light having low light energy Eb is received in the wide irradiation region Wb from the light emitting diode 58 of the second ultraviolet irradiation device 52.

  Further, as shown in FIG. 7, the horizontal axis of FIG. 7 is the width direction of the printing paper S. As can be seen from the graph of FIG. 7, the UV ink on the printing paper S is high light from the light emitting diode 56 of the first ultraviolet irradiation device 51 at the position A in the longitudinal direction of the printing paper S (upper drawing in FIG. 7). Spots ultraviolet rays having energy Ea. Thereafter, ultraviolet light having low light energy Eb is received over a wide range from the light emitting diode 58 of the second ultraviolet irradiation device 52 at the B position in the longitudinal direction of the printing paper S (lower diagram in FIG. 7). In this case, since the light emitting diode 56 and the light emitting diode 58 are shifted from each other in the width direction of the printing paper S, the peak positions A1, A2,. B1, B2,.

  As described above, the UV ink of the printing paper S is different in time from the light emitting diode 56 of the first ultraviolet irradiation device 51 and the light emitting diode 58 of the second ultraviolet irradiation device 52, and has different light energy and irradiation range. Will receive. As a result, the UV ink of the printing paper S is activated by the photoinitiator contained in the UV ink by the ultraviolet light energy from the light emitting diode 56 of the first ultraviolet irradiation device 51, and a reaction starting point is formed. These double bonds are activated and chemically bonded to form a cured film. However, since the ultraviolet irradiation from the light emitting diode 56 is spot-like, curing is insufficient in the vicinity of the peak positions A1, A2,. However, subsequently, the UV ink on the printing paper S is cured by the UV light energy from the light emitting diode 58 of the second ultraviolet irradiation device 52 over a wide range around the peak positions A1, A2,. Is promoted, and a cured film is formed in all printing regions.

  In general, in order to cure and dry the UV ink, the integrated light amount (area of the hatched portion in FIGS. 6 and 7) obtained from the irradiation time and light energy in the ultraviolet ray is emphasized, and this integrated light amount is required to be a predetermined amount or more. It is thought that there is. However, in order to cure the UV ink, it is necessary to activate a photoinitiator contained in the UV ink with a predetermined or higher light energy to form a reaction start point. In the present embodiment, curing of the UV ink is started by the first ultraviolet irradiation device 51, and the entire UV ink is cured by the second ultraviolet irradiation device 52.

  In this case, in the first ultraviolet irradiation device 51, the distance L1 between the light emitting diode 56 and the printing paper S is set according to the light emission energy of the light emitting diode 56. The UV ink on the printing paper S is generated by this light emission energy. Is set to a distance shorter than the distance at which the reaction start point can be formed.

  Here, a printing operation by the offset sheet-fed printing press according to the first embodiment will be described.

  In the offset sheet-fed printing press according to the first embodiment, as illustrated in FIGS. 1 and 2, the paper feeding unit 11 supplies the printing paper S one by one at a predetermined interval, and the printing unit 12 is fed from the paper feeding unit 11. Five colors are printed on the supplied printing paper S by the printing units 12a, 12b, 12c, 12d, and 12e. In this case, it is good also as 1-4 color printing as needed.

  The printing paper S printed by the printing unit 12 is conveyed to the paper discharge unit 13. That is, the printing paper S is conveyed from the impression cylinder 20 to the first paper discharge cylinder 21, and is conveyed from the first paper discharge cylinder 21 to the second paper discharge cylinder 22. At this time, the drying device 14 irradiates the image (UV ink) on the surface of the printing paper S conveyed by the rotation of the second paper discharge drum 22 with ultraviolet rays. Then, the image (UV ink) on the surface of the printing paper S receives ultraviolet rays and is dried and solidified. Thereafter, the printing paper S is transported by the chain gripper mechanism 23 and stacked on the paper discharge tray 24.

  When the printing paper S is transported on the second paper discharge drum 22, as shown in FIG. 3, first, the UV light adhering to the surface of the printing paper S is applied to the first ultraviolet irradiation device 51. Ultraviolet rays are irradiated from each light emitting diode 56. In this case, since each light emitting diode 56 is located at a position close to the printing surface (UV ink) of the printing paper S, high light energy possessed by ultraviolet rays is spot-applied to the UV ink. As a result, the UV ink of the printing paper S starts to be cured by the high energy of ultraviolet light received from the light emitting diode 56 of the first ultraviolet irradiation device 51.

  Next, the UV ink adhering to the surface of the printing paper S is irradiated with ultraviolet rays from the respective light emitting diodes 58 of the second ultraviolet irradiation device 52. In this case, since each light emitting diode 58 is located at a predetermined distance from the printing surface (UV ink) of the printing paper S, light energy with low ultraviolet rays is applied to the UV ink over a wide range. As a result, the UV ink on the printing paper S is cured in all printing regions by the low light energy of a wide range of ultraviolet rays received from the light emitting diode 58 of the second ultraviolet irradiation device 52.

  That is, in this embodiment, curing of the UV ink is started by the high light energy from the first ultraviolet irradiation device 51, and the effect is insufficient in the low but wide range of light energy from the second ultraviolet irradiation device 52. The UV ink is reliably cured. In this case, by using the two ultraviolet irradiation devices 51 and 52, it is possible to secure a sufficient integrated light quantity of ultraviolet rays.

  As described above, in the drying device 14 applied to the offset sheet-fed printing press according to the first embodiment, the paper feeding unit 11, the printing unit 12, and the paper discharge unit 13 are arranged in series, and the printing paper S in the printing unit 12 is placed. The drying device 14 is arranged downstream in the transport direction, and the drying device 14 irradiates a predetermined region with ultraviolet light having a preset light energy toward the ultraviolet curable ink of the printing paper S. The ultraviolet ray having lower light energy than the ultraviolet ray emitted by the first ultraviolet ray irradiating device 51 is directed toward the ultraviolet ray curable ink of the 1 ultraviolet ray irradiating device 51 and the ultraviolet ray curable ink of the printing paper S. A second ultraviolet irradiation device 52 is provided.

  Accordingly, when the ultraviolet light energy from the first ultraviolet irradiation device 51 acts in a spot manner on the ultraviolet curable ink of the printing paper S, the curing of the ink is started, and the ultraviolet light from the second ultraviolet irradiation device 52 is started. As a result, the light energy of the entire area acts on the ultraviolet curable ink of the printing paper S, so that the ink in all areas is cured, and it is possible to suppress drying unevenness and improve the printing quality. It is possible to suppress an increase in product cost.

  Further, in the drying device 14 of the first embodiment, the first ultraviolet irradiation device 51 and the second ultraviolet irradiation device 51 are arranged such that the plurality of light emitting diodes 56 and 58 are linearly formed along the direction intersecting the transport direction of the printing paper S. The first ultraviolet irradiation device 51 is arranged upstream of the second ultraviolet irradiation device 52 in the transport direction of the printing paper S. Therefore, first, the curing of the UV ink on the printing paper S is started by the high light energy from the first ultraviolet irradiation device 51, and the UV on the printing paper S is spread by the low light energy spreading over a wide range from the second ultraviolet irradiation device 52. The ink is cured as a whole, and UV ink drying unevenness can be appropriately suppressed.

  Moreover, in the drying apparatus 14 of Example 1, the several light emitting diode 56 which comprises the 1st ultraviolet irradiation device 51 and the several light emitting diode 58 which comprises the 2nd ultraviolet irradiation device 52 shall have the same luminescent energy. The first ultraviolet irradiation device 51 is arranged closer to the printing paper S than the second ultraviolet irradiation device 52. Therefore, by making the light emitting diodes 56 and 58 of the respective ultraviolet irradiation devices 51 and 52 the same, it is possible to reduce the cost by sharing parts.

  In addition, in the drying apparatus 14 of Example 1 mentioned above, although each light emitting diode 56 which comprises the 1st ultraviolet irradiation device 51 and each light emitting diode 58 which comprises the 2nd ultraviolet irradiation device 52 were arrange | positioned in zigzag form, You may arrange | position facing the conveyance direction of the printing paper S, and may arrange | position at random the number of each light emitting diodes 56 and 58 as the same number or a different number.

  FIG. 8 is a schematic diagram illustrating a drying device according to a second embodiment of the present invention, and FIG. 9 is a front view illustrating the drying device according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the second embodiment, as in the first embodiment described above, ultraviolet rays are opposed to the outer peripheral surface of the second paper discharge cylinder 22 at the paper discharge unit of the offset sheet-fed printing press, as shown in FIGS. Is provided with a drying device 60 for drying the UV ink transferred to the printing paper S. The drying device 60 is disposed opposite to the second paper discharge drum 22 and irradiates ultraviolet rays having light energy set in advance toward the UV ink of the printing paper S onto a predetermined region. A first ultraviolet irradiation device 61 and a second ultraviolet ray that irradiates the UV ink of the printing paper S with an ultraviolet ray having light energy lower than the ultraviolet ray emitted by the first ultraviolet ray irradiation device 61 to an irradiation region wider than the irradiation region by the first ultraviolet irradiation device 61 An ultraviolet irradiation device 62 is included.

  In the drying device 60, a housing 63 having a U-shaped cross section facing the outer peripheral surface of the second paper discharge drum 22 is disposed over substantially the same length along the axial direction of the second paper discharge drum 22. The housing 63 is supported by a frame (not shown) via a mounting bracket 64. The housing 63 is provided with a first ultraviolet irradiation device 61 and a second ultraviolet irradiation device 62. In the present embodiment, the first ultraviolet irradiation device 61 is disposed upstream of the second ultraviolet irradiation device 62 in the transport direction of the printing paper S.

  In the case 65 fixed to the housing 63 by the first ultraviolet irradiation device 61, a plurality of light emitting diodes 66 are arranged in a row along a direction intersecting (orthogonal in this embodiment) with the conveyance direction of the printing paper S. Are arranged in a straight line. On the other hand, the case 67 fixed to the housing 63 by the second ultraviolet irradiation device 62 has a plurality of light emitting diodes 68 along a direction intersecting (in the present embodiment, orthogonal) to the transport direction of the printing paper S. They are arranged in a straight line in one row.

  Each light emitting diode 66 constituting the first ultraviolet irradiation device 61 is set so as to have a larger light emission energy than each light emitting diode 68 constituting the second ultraviolet irradiation device 62. In this case, the number of light emitting diodes 68 in the second ultraviolet irradiation device 62 is set larger than the number of light emitting diodes 66 in the first ultraviolet irradiation device 61. In addition, each light emitting diode 66 constituting the first ultraviolet irradiation device 61 and each light emitting diode 68 constituting the second ultraviolet irradiation device 62 are arranged at positions separated from the printing paper S by the same distance. In this case, it is desirable that the irradiation angle of each light emitting diode 68 in the second ultraviolet irradiation device 62 is larger than the irradiation angle of each light emitting diode 66 in the first ultraviolet irradiation device 61.

  Therefore, the UV ink of the printing paper S receives ultraviolet light having high light energy from a light emitting diode 66 of the first ultraviolet irradiation device 61 in a narrow range. On the other hand, the UV ink of the printing paper S receives ultraviolet rays having low light energy from a light emitting diode 68 of the second ultraviolet irradiation device 62 in a wide range.

  Therefore, in the printing operation by the offset sheet-fed printing press of Example 2, in the drying operation of the printing paper S (UV ink) by the drying device 60, the light emitting diode 66 of the first ultraviolet irradiation device 61 and the second ultraviolet irradiation device 62. The light-emitting diode 68 receives ultraviolet rays having different light energy and irradiation range. That is, when the printing paper S is transported on the second paper discharge drum 22, the UV ink adhering to the surface of the printing paper S is first subjected to ultraviolet rays from each light emitting diode 66 of the first ultraviolet irradiation device 61. Is irradiated. In this case, since each light-emitting diode 66 is located at a position close to the printing surface (UV ink) of the printing paper S, high light energy possessed by ultraviolet rays is spot-applied to the UV ink. As a result, the UV ink of the printing paper S starts to be cured by the high energy of ultraviolet rays received from the light emitting diode 66 of the first ultraviolet irradiation device 61.

  Next, the UV ink adhering to the surface of the printing paper S is irradiated with ultraviolet rays from the light emitting diodes 68 of the second ultraviolet irradiation device 62. In this case, since the light emission energy of each light emitting diode 68 is low, light energy with low ultraviolet rays is applied to the UV ink over a wide range. As a result, the UV ink on the printing paper S is cured in all printing regions by the low light energy of a wide range of ultraviolet rays received from the light emitting diode 68 of the second ultraviolet irradiation device 62.

  That is, in this embodiment, curing of the UV ink is started by the high light energy from the first ultraviolet irradiation device 61, and the effect is insufficient in the low but wide range of light energy from the second ultraviolet irradiation device 62. The UV ink is reliably cured. In this case, by using the two ultraviolet irradiation devices 61 and 62, a sufficient accumulated light quantity of ultraviolet rays can be secured.

  As described above, in the drying device 60 according to the second embodiment, the first ultraviolet irradiation device that irradiates the predetermined region with the ultraviolet light having the preset light energy toward the ultraviolet curable ink of the printing paper S. 61 and the second ultraviolet ray irradiation for irradiating the ultraviolet ray curable ink of the printing paper S with the ultraviolet ray having light energy lower than the ultraviolet ray by the first ultraviolet ray irradiating device 61 to the irradiation region wider than the irradiation region by the first ultraviolet ray irradiating device 61. A device 62 is provided.

  Accordingly, when the ultraviolet light energy from the first ultraviolet irradiation device 61 acts in a spot manner on the ultraviolet curable ink of the printing paper S, the curing of the ink is started, and the ultraviolet light from the second ultraviolet irradiation device 62 starts. As a result, the light energy of the entire area acts on the ultraviolet curable ink of the printing paper S, so that the ink in all areas is cured, and it is possible to suppress drying unevenness and improve the printing quality. It is possible to suppress an increase in product cost.

  Further, in the drying device 60 of Example 2, the plurality of light emitting diodes 66 constituting the first ultraviolet irradiation device 61 have a larger emission energy than the plurality of light emitting diodes 68 constituting the second ultraviolet irradiation device 62, The first ultraviolet irradiation device 61 and the second ultraviolet irradiation device 62 are arranged at the same distance from the printing paper S. Therefore, by arranging the light emitting diodes 66 and 68 at the same distance from the printing paper S, the apparatus can be made compact.

  FIG. 10 is a front view illustrating a drying apparatus according to Embodiment 3 of the present invention.

  In the third embodiment, as in each of the embodiments described above, as shown in FIG. 10, the drying device 70 is disposed at the paper discharge unit of the offset sheet-fed printing machine so as to face the outer peripheral surface of the second paper discharge cylinder. It is installed. The drying device 70 includes a first ultraviolet irradiation device 71 that irradiates a predetermined area with ultraviolet light having light energy set in advance toward the UV ink on the printing paper, and a first ultraviolet irradiation device 71 toward the UV ink on the printing paper. The first ultraviolet irradiation device 71 is configured by a second ultraviolet irradiation device 72 that irradiates an irradiation region wider than an irradiation region by the first ultraviolet irradiation device 71 with an ultraviolet energy having a light energy lower than that of the ultraviolet rays.

  In the drying device 70, the first ultraviolet irradiation device 71 and the second ultraviolet irradiation device 72 are mounted on a housing 73. The housing 73 is disposed over the entire area along the width direction of the printing paper to be conveyed, and a circular case 74 is linearly arranged in the longitudinal direction, that is, the width direction of the printing paper. It is fixed so that it is arranged. In each case 74, a light emitting diode 75 that constitutes the first ultraviolet irradiation device 71 is fixed at the center. In each case 74, a plurality (eight in this embodiment) of light emitting diodes 76 constituting the second ultraviolet irradiation device 72 are arranged around the light emitting diode 75 and fixed in a ring shape. ing.

  That is, in this embodiment, the plurality of light emitting diodes 75 as the first ultraviolet irradiation device 71 are linearly arranged along the direction intersecting the transport direction of the printing paper, and the plurality of light emitting diodes 72 as the second ultraviolet irradiation device 72 are arranged. Light emitting diodes 76 are arranged in a ring around the light emitting diodes 75.

  And each light emitting diode 75 which comprises the 1st ultraviolet irradiation device 71 is set so that it may have larger light emission energy than each light emitting diode 76 which comprises the 2nd ultraviolet irradiation device 72. In addition, each light emitting diode 75 constituting the first ultraviolet irradiation device 71 and each light emitting diode 76 constituting the second ultraviolet irradiation device 72 are arranged at positions separated from the printing paper by the same distance.

  Therefore, the UV ink of the printing paper receives ultraviolet rays having high light energy from a light emitting diode 75 of the first ultraviolet irradiation device 71 in a narrow range. On the other hand, the UV ink of the printing paper receives ultraviolet rays having low light energy in a wide range from the light emitting diodes 76 of the second ultraviolet irradiation device 72.

  Therefore, in the printing operation by the offset sheet-fed printing press of the third embodiment, in the drying operation of the printing paper (UV ink) by the drying device 70, the light emitting diode 75 of the first ultraviolet irradiation device 71 and the second ultraviolet irradiation device 72. The light-emitting diode 76 receives ultraviolet light having different light energy and irradiation range. That is, when the printing paper is conveyed, ultraviolet light is irradiated from each light emitting diode 75 of the first ultraviolet irradiation device 71 to the UV ink adhering to the surface of the printing paper. In this case, since each light emitting diode 75 is located at a position close to the printing surface (UV ink) of the printing paper, high light energy possessed by ultraviolet rays is spot-applied to the UV ink. As a result, the UV ink of the printing paper starts to be cured by the high energy of ultraviolet rays received from the light emitting diode 75 of the first ultraviolet irradiation device 71.

  At the same time, the UV ink adhering to the surface of the printing paper is irradiated with ultraviolet rays from the respective light emitting diodes 76 of the second ultraviolet irradiation device 72. In this case, since the light emission energy of each light emitting diode 76 is low, light energy with low ultraviolet light is applied over a wide range to the UV ink. As a result, the UV ink in the printing area is cured by the low light energy of a wide range of ultraviolet rays received from the light emitting diode 76 of the second ultraviolet irradiation device 72.

  That is, in this embodiment, the curing of the UV ink is started by the high light energy from the first ultraviolet irradiation device 71, and the effect of the low energy from the second ultraviolet irradiation device 72 is insufficient due to the light energy over a wide range. The UV ink is reliably cured. In this case, by using the two ultraviolet irradiation devices 71 and 72, a sufficient accumulated light quantity of ultraviolet rays can be secured.

  As described above, in the drying device 70 according to the third embodiment, the first ultraviolet irradiation device 71 that irradiates the predetermined region with the ultraviolet ray having the preset light energy toward the ultraviolet curable ink of the printing paper. And a second ultraviolet irradiation device 72 that irradiates ultraviolet rays having a light energy lower than that of the ultraviolet rays emitted from the first ultraviolet irradiation device 71 toward the ultraviolet curable ink of the printing paper to an irradiation region wider than the irradiation region of the first ultraviolet irradiation device 71. Is provided.

  Therefore, when the ultraviolet light energy from the first ultraviolet irradiation device 71 acts in a spot manner on the ultraviolet curable ink of the printing paper, the curing of the ink is started, and the ultraviolet light from the second ultraviolet irradiation device 72 starts. As the light energy acts on the UV curable ink of the printing paper as a whole, the ink in all areas is cured, and it is possible to improve the printing quality by suppressing the drying unevenness and the product. An increase in cost can be suppressed.

  Further, in the drying device 70 of Example 3, the plurality of light emitting diodes 75 constituting the first ultraviolet irradiation device 71 have a larger emission energy than the plurality of light emitting diodes 76 constituting the second ultraviolet irradiation device 72, A plurality of light emitting diodes 75 as the first ultraviolet irradiation device 71 are arranged in a straight line along a direction intersecting the conveyance direction of the printing paper, and the plurality of light emitting diodes 76 as the second ultraviolet irradiation device 72 are arranged in the light emitting diodes 75. Are arranged in a ring shape, and the first ultraviolet irradiation device 71 and the second ultraviolet irradiation device 72 are arranged at the same distance from the printing paper. Therefore, it is not necessary to arrange a plurality of light emitting diodes 75 and 76 in two rows as the two ultraviolet irradiation devices 71 and 72, and the size of the devices can be reduced.

  FIG. 11: is a front view showing the schematic showing the drying apparatus which concerns on Example 4 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the fourth embodiment, similarly to the first embodiment described above, the discharge unit of the offset sheet-fed printing press irradiates ultraviolet rays so as to face the outer peripheral surface of the second discharge cylinder 22 as shown in FIG. A drying device 80 for drying the UV ink transferred to the printing paper S is provided. The drying device 80 is disposed to face the second paper discharge drum 22 and irradiates ultraviolet rays having light energy set in advance toward the UV ink of the printing paper S onto a predetermined region. A second ultraviolet ray irradiation device 81 and a second ultraviolet ray having a light energy lower than the ultraviolet ray emitted by the first ultraviolet ray irradiation device 81 toward the UV ink of the printing paper S are irradiated on a wider irradiation region than the irradiation region by the first ultraviolet ray irradiation device 81. An ultraviolet irradiation device 82 is used.

  In the drying device 80, the first ultraviolet irradiation device 81 and the second ultraviolet irradiation device 82 are arranged along a direction intersecting the transport direction of the printing paper S, and the first ultraviolet irradiation device 81 is the second ultraviolet irradiation device. 82 is disposed upstream of the printing paper S in the transport direction. The first ultraviolet irradiation device 81 includes a housing 83 in which a plurality of light emitting diodes 84 are linearly arranged. On the other hand, the second ultraviolet irradiation device 82 is configured by arranging a plurality of light emitting diodes 86 in a straight line on a housing 85.

  In this case, the relationship between each light emitting diode 84 constituting the first ultraviolet irradiation device 81 and each light emitting diode 86 constituting the second ultraviolet irradiation device 82 is the same as that of the printing paper S as in the first embodiment. The distance may be changed, or the light emission energy may be changed as in the second embodiment. Therefore, the UV ink of the printing paper S receives ultraviolet light having high light energy from the light emitting diode 84 of the first ultraviolet irradiation device 81 in a narrow range, and low light from the light emitting diode 86 of the second ultraviolet irradiation device 82. It receives ultraviolet rays with energy over a wide range.

  Further, in the present embodiment, the light emitting diodes 84 constituting the first ultraviolet irradiation device 81 are arranged so as to be inclined at a predetermined angle with respect to a direction orthogonal to the conveyance direction of the printing paper S. On the other hand, the light emitting diodes 86 constituting the second ultraviolet irradiation device 82 are arranged in a direction orthogonal to the conveyance direction of the printing paper S. Therefore, in the first ultraviolet irradiation device 81, the distance between the light emitting diodes 84 in the direction orthogonal to the conveyance direction of the printing paper S compared to the case where the light emitting diodes 84 are arranged in the direction orthogonal to the conveyance direction of the printing paper S. Becomes shorter.

  In addition, since the effect | action by the drying apparatus 80 of a present Example is substantially the same as each Example mentioned above, detailed description is abbreviate | omitted.

  As described above, in the offset sheet-fed printing press according to the fourth embodiment, as the drying device 80, ultraviolet light having light energy set in advance toward the ultraviolet curable ink of the printing paper S is applied to a predetermined region. A first ultraviolet irradiation device 81 that irradiates, and a second ultraviolet irradiation device 82 that irradiates a wide irradiation region with light energy lower than that of the first ultraviolet irradiation device 81 toward the ultraviolet curable ink of the printing paper S is provided. A plurality of light emitting diodes 84 constituting the irradiation device 81 are arranged so as to be inclined at a predetermined angle with respect to a direction orthogonal to the conveyance direction of the printing paper S.

  Therefore, in the first ultraviolet irradiation device 81, the distance between the light emitting diodes 84 in the direction orthogonal to the conveyance direction of the printing paper S is shortened, and the ultraviolet irradiation pitch in the width direction of the printing paper S can be reduced. Ink drying unevenness can be suppressed to improve the printing quality, and the arrangement of the plurality of light emitting diodes 84 can be simplified.

  FIG. 12: is a front view showing the schematic showing the drying apparatus which concerns on Example 5 of this invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the fifth embodiment, as in the fourth embodiment described above, the discharge unit of the offset sheet-fed printing machine irradiates ultraviolet rays so as to face the outer peripheral surface of the second discharge cylinder 22 as shown in FIG. A drying device 90 for drying the UV ink transferred to the printing paper S is disposed. The drying device 90 includes a first ultraviolet irradiation device 91 that irradiates a predetermined area with ultraviolet light having light energy set in advance toward the UV ink on the printing paper S, and the UV ink on the printing paper S. The second ultraviolet irradiation device 92 is configured to irradiate the irradiation region wider than the irradiation region of the first ultraviolet irradiation device 91 with ultraviolet light having lower light energy than that of the first ultraviolet irradiation device 91.

  In the drying device 90, the first ultraviolet irradiation device 91 and the second ultraviolet irradiation device 92 are arranged along the direction intersecting the transport direction of the printing paper S, and the first ultraviolet irradiation device 91 is the second ultraviolet irradiation device. It is arranged upstream of the print sheet S in the transport direction from 92. The first ultraviolet irradiation device 91 is configured by arranging a plurality of light emitting diodes 93 in a straight line, and the second ultraviolet irradiation device 92 is configured by arranging a plurality of light emitting diodes 94 in a linear shape. .

  In this case, the relationship between each light emitting diode 93 constituting the first ultraviolet irradiation device 91 and each light emitting diode 94 constituting the second ultraviolet irradiation device 92 is the same as that of the printing paper S as in the first embodiment. The distance may be changed, or the light emission energy may be changed as in the second embodiment. Therefore, the UV ink of the printing paper S receives ultraviolet light having high light energy in a narrow range from the light emitting diode 93 of the first ultraviolet irradiation device 91, and low light from the light emitting diode 94 of the second ultraviolet irradiation device 92. It receives ultraviolet rays with energy over a wide range.

  Further, in the present embodiment, the first ultraviolet irradiation device 91 is positioned at the central portion in the width direction of the printing paper S, and at the end in the width direction of the printing paper S from the first block 91a. The second and third blocks 91b and 91c are configured. The light emitting diodes 93 constituting the first block 91a are arranged with an inclination of a predetermined angle with respect to a direction orthogonal to the conveyance direction of the printing paper S. On the other hand, the respective light emitting diodes 93 constituting the second and third blocks 91b and 91c are arranged in a direction orthogonal to the conveyance direction of the printing paper S. Therefore, in the 1st ultraviolet irradiation device 91, the pitch of the width direction of the printing paper S of the light emitting diode 93 in the 1st block 91a is short.

  As described above, in the offset sheet-fed printing press according to the fifth embodiment, the first ultraviolet irradiation device 91 and the second ultraviolet irradiation device 92 are provided as the drying device 90, and the first ultraviolet irradiation device 91 has a central portion. The plurality of light emitting diodes 93 of the first block 91a that are positioned are arranged so as to be inclined by a predetermined angle with respect to the direction orthogonal to the conveyance direction of the printing paper S.

  Accordingly, in the first block 91a of the first ultraviolet irradiation device 91, the distance between the light emitting diodes 93 in the direction orthogonal to the transport direction of the printing paper S is shortened, and the ultraviolet irradiation pitch in the width direction of the printing paper S is reduced. be able to. In general, since the image printed on the printing paper S has a thick ink film on the central side in the width direction, the UV irradiation drying unevenness is suppressed by reducing the ultraviolet irradiation pitch in the central region. Printing quality can be improved.

  In the fifth embodiment, the arrangement of the plurality of light emitting diodes 93 of the first block 91a located at the center portion in the first ultraviolet irradiation device 91 is predetermined with respect to the direction orthogonal to the transport direction of the printing paper S. Although it is inclined by an angle, this position may be set as appropriate. For example, when an area having a large ink film thickness in the image of the printing paper S is located at the end, the area on the end may be inclined. If necessary, the second ultraviolet irradiation device 92 may be inclined.

  In the fourth and fifth embodiments, the first ultraviolet irradiation device 81 and the first block 91a of the first ultraviolet irradiation device 91 are inclined in the direction perpendicular to the transport direction of the printing paper S. In this case, The distance between the first ultraviolet irradiation devices 81 and 91 and the printing paper S on the second paper discharge cylinder 22 is different at each position in the longitudinal direction. Therefore, it is desirable that the first ultraviolet irradiation device 81 and the first block 91 a of the first ultraviolet irradiation device 91 have a curved shape so as to follow the arc-shaped outer peripheral surface of the second paper discharge drum 22.

  In each of the above-described embodiments, the drying apparatus of the present invention is applied to a single-sided offset sheet-fed printing press, but may be applied to a double-sided offset sheet-fed printing press. In this case, the double-sided offset sheet-fed printing press is composed of a paper feeding unit, a back surface printing unit, a connecting part or a reversing part, a front surface printing part, and a paper discharging part, and an intermediate cylinder or paper discharging part in the connecting part A drying device may be disposed to face the paper discharge cylinder. In each of the above-described embodiments, the drying apparatus of the present invention has been described as applied to an offset sheet-fed printing press, but may be applied to an offset rotary printing press. Furthermore, although the drying apparatus of the present invention is provided to face the intermediate cylinder and the paper discharge unit, it may be provided to face the printing sheet conveyed in a horizontal state.

  Further, the drying device of the present invention is for drying the ultraviolet curable coating material, and is not limited to drying the ultraviolet curable ink as in each of the above-described embodiments. For example, the ultraviolet curable coating material is used. It can also be used to dry varnish (such as varnish).

  The drying apparatus and the printing press according to the present invention include a first ultraviolet irradiation unit that irradiates ultraviolet rays having high light energy and a second ultraviolet irradiation unit that irradiates ultraviolet rays having low light energy over a wide area, It is intended to improve the printing quality by suppressing drying unevenness and to suppress an increase in product cost, and can be applied to any printing machine.

DESCRIPTION OF SYMBOLS 11 Paper feed part 12 Printing part 13 Paper discharge part 14,60,70,80,90 Drying device 21 1st paper discharge drum 22 2nd paper discharge drum 51,61,71,81,91 1st ultraviolet irradiation device 52, 62, 72, 82, 92 Second ultraviolet irradiation device 56, 58, 66, 68, 75, 76, 84, 86, 93, 94 Light emitting diode S Printing paper (printing sheet)

Claims (7)

In the drying device that irradiates and cures the ultraviolet curable coating material transferred to the printing surface of the printing sheet,
A first ultraviolet irradiation means for irradiating ultraviolet rays having light energy set in advance toward the ultraviolet curable coating material of the printing sheet on a predetermined region set in advance;
A second ultraviolet irradiation means for irradiating an ultraviolet ray having a light energy lower than that of the ultraviolet ray emitted from the first ultraviolet ray irradiation means toward an ultraviolet ray curable coating material of the print sheet on an irradiation area wider than the irradiation area of the first ultraviolet ray irradiation means; ,
A drying apparatus comprising:   The first ultraviolet irradiation means and the second ultraviolet irradiation means are configured by linearly arranging a plurality of light emitting diodes along a direction intersecting a conveyance direction of the print sheet. The drying apparatus according to claim 1, wherein the drying apparatus is disposed upstream of the second ultraviolet irradiation unit in the conveyance direction of the print sheet.   The first ultraviolet irradiation means includes a plurality of light emitting diodes arranged in a straight line along a direction intersecting the conveyance direction of the print sheet, and the second ultraviolet irradiation means constitutes the first ultraviolet irradiation means. The drying apparatus according to claim 1, wherein light emitting diodes are arranged in a ring shape around the light emitting diodes.   The plurality of light emitting diodes constituting the first ultraviolet irradiation means and the plurality of light emitting diodes constituting the second ultraviolet irradiation means have the same emission energy, while the first ultraviolet irradiation means is the second ultraviolet irradiation means. 4. The drying apparatus according to claim 2, wherein the drying apparatus is disposed closer to the printing sheet than the ultraviolet irradiation means.   The plurality of light emitting diodes constituting the first ultraviolet irradiation means have larger light emission energy than the plurality of light emitting diodes constituting the second ultraviolet irradiation means, while the first ultraviolet irradiation means and the second ultraviolet light are included. The drying apparatus according to claim 2 or 3, wherein the irradiation unit is disposed at the same distance from the printing sheet.   3. The drying apparatus according to claim 2, wherein the plurality of light emitting diodes constituting the first ultraviolet irradiation unit are arranged to be inclined at a predetermined angle with respect to a direction orthogonal to a conveyance direction of the print sheet. . In a printing machine in which a paper feeding unit, a printing unit, and a paper discharging unit are arranged in series, and a drying device is arranged on the downstream side in the printing sheet conveyance direction in the printing unit,
The drying device
A first ultraviolet irradiation means for irradiating ultraviolet rays having light energy set in advance toward the ultraviolet curable coating material of the printing sheet on a predetermined region set in advance;
A second ultraviolet irradiation means for irradiating an ultraviolet ray having a light energy lower than that of the ultraviolet ray emitted from the first ultraviolet ray irradiation means toward an ultraviolet ray curable coating material of the print sheet on an irradiation area wider than the irradiation area of the first ultraviolet ray irradiation means; ,
A printing machine comprising:

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