JP2012111123A - Printing device, printing method, rotary printing press, and printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve print quality regardless of the type of a print medium, in a printing device, a printing method, a rotary printing press, and a printing press.SOLUTION: The printing device includes: a rotatable impression cylinder 32; a blanket cylinder 31 which is rotatable in contact with and in synchronization with the impression cylinder 32 and can transfer a print sheet S sandwiched between the impression cylinder 32 and the blanket cylinder; an inkjet head 34 which forms an image by spraying water-based ink onto the surface of the blanket cylinder 31; a first lamp 35 which applies infrared rays to the image formed on the surface of the blanket cylinder 31 by the inkjet head 34 to dry the image; and a second lamp 36 which applies ultraviolet rays to the image transferred from the blanket cylinder 31 to the print sheet S to dry the image.

Description

  The present invention relates to a printing apparatus and a printing method for performing printing using an inkjet head, and a rotary printing press and a printing press including the printing apparatus.

  As printing apparatuses that perform printing using an inkjet head, there are those described in Patent Documents 1 and 2 below. The printing apparatus described in Patent Document 1 forms an image by spraying ultraviolet curable ink onto the surface of a blanket cylinder with an inkjet head, and uses the ultraviolet curable ink of the image formed on the surface of the blanket cylinder as a first ultraviolet ray. After the primary drying by the irradiation device, it is transferred to the printing medium, and then the ultraviolet curable ink of the image transferred to the printing medium is secondarily dried by the second ultraviolet irradiation device. The printing apparatus described in Patent Document 2 forms an image by spraying water-based ink onto the surface of the blanket cylinder with an ink jet head, and the water-based ink of the image formed on the surface of the blanket cylinder is subjected to primary using a first heating device. After drying, it is transferred to a printing medium, and then the aqueous ink of the image transferred to the printing medium is secondarily dried by a second heating device.

  In addition, the recording apparatuses described in Patent Documents 3 and 4 are provided with two ultraviolet light sources as ultraviolet irradiation devices, the ultraviolet light of the ultraviolet light source that irradiates the printing paper near the print head, and the carriage moving direction from the vicinity of the print head. By changing the wavelength of the ultraviolet light source that irradiates the recording medium that is separated along the line, the thickness of the ink that adheres to the recording medium can be increased, and the ink can be cured well. .

JP 2010-149412 A JP 2010-221552 A JP 2008-188983 A JP 2008-188984 A

  In the printing apparatus described in Patent Document 1 described above, the ultraviolet curable ink discharged from the inkjet head is dried in two stages by two ultraviolet irradiation apparatuses to fix the ink to the printing medium. Moreover, in the printing apparatus described in Patent Document 2, the heat-set ink discharged from the inkjet head is fixed to the printing medium by two-stage drying using two heating apparatuses. In this case, in the above two patent documents, the ink semi-dry state and the completely dry state are formed by adjusting the outputs of the two ultraviolet irradiation devices or the two heating devices. However, since the printing medium is transported at a high speed and it is necessary to have an optimum ink adhesive force when ink is attached to paper, the dried state of the ink ejected from the inkjet head is made semi-dry. Therefore, it is difficult to properly control the heating amount and the UV irradiation amount, and it is difficult to ensure a high printing accuracy.

  In the recording apparatuses described in Patent Documents 3 and 4, the ink on the recording medium is irradiated with ultraviolet rays having different wavelengths, so that even a thick ink can be cured well. However, although the recording apparatus can cure the ink having a large film thickness well, it irradiates the ink sprayed on the recording medium with ultraviolet rays. After the ink is sprayed on the blanket cylinder, It is not transferred from the blanket cylinder to the printing medium, and is difficult to apply to a printing apparatus that performs two-stage drying.

  SUMMARY An advantage of some aspects of the invention is that it provides a printing apparatus, a printing method, a rotary printing press, and a printing press that can improve printing quality regardless of the type of printing medium.

  In order to achieve the above object, a printing apparatus according to the present invention includes an ink jet head that forms an image by spraying ink containing a heat drying or heat curing component and an ultraviolet drying or ultraviolet curing component, and the ink jet head spraying from the ink jet head. And a second drying device for irradiating the ink with ultraviolet rays and drying or curing the ultraviolet rays.

  Therefore, the ink sprayed by the ink jet head is heated and dried or cured by the first drying device, and subsequently irradiated with ultraviolet rays by the second drying device and cured by ultraviolet drying or ultraviolet curing, so that the ink has a high viscosity. It will be transferred to the print medium in a dry state. Therefore, the ink does not penetrate into the print medium and is maintained without distorting the image, and the print quality can be improved. Specifically, it is possible to improve dot gain stability by improving the viscosity of the ink and to prevent ink bleeding. In addition, the print quality can be improved regardless of the type of print medium.

  In the printing apparatus of the present invention, the second drying device is characterized in that the ink that has been heat-dried or heat-cured is irradiated with ultraviolet light to be UV-dried or UV-cured.

  Therefore, after sufficient ink adhesive strength is secured first, the ink is completely dried or cured, and high print quality can be ensured.

  In the printing apparatus of the present invention, the ink that is sprayed from the ink jet head is provided with a rotatable print body and a transfer body that can be synchronously moved in contact with the print body and can be conveyed with the print medium interposed therebetween. Is sprayed onto the surface of the transfer body.

  Therefore, since the ink image formed on the surface of the printing body by the ink jet head is primarily dried or cured by the first drying apparatus and then transferred to the printing medium, it is transferred from the blanket cylinder to the printing medium in a high viscosity state. As a result, the printing quality can be improved.

  In the printing apparatus according to the aspect of the invention, the first drying device is disposed so as to face the outer peripheral surface of the transfer body, and the ink sprayed from the ink jet head to the outer peripheral surface of the transfer body is dried by heating or cured. It is characterized by doing.

  Accordingly, the ink sprayed on the outer peripheral surface of the transfer body can be dried by heating or cured by the first drying device, and an ideal semi-dried state can be secured.

  Further, the printing apparatus of the present invention includes a conveyance body that can hold and convey a print medium, an inkjet head that forms an image by spraying ink on the surface of the print medium held by the conveyance body, and the inkjet head. A first drying device that heat-drys or heat-cures the blown ink, and a second drying device that irradiates the ink sprayed on the surface of the print medium with ultraviolet rays to dry or cure the ultraviolet rays. It is characterized by.

  Therefore, the image formed on the surface of the print medium by the ink jet head is heated and dried or cured by the first drying device, and then dried or cured by the ultraviolet rays from the second drying device, so that the viscosity is high. Is held on the print medium. Therefore, the ink does not penetrate into the print medium and is maintained without distorting the image, and the print quality can be improved. Specifically, it is possible to improve dot gain stability by improving the viscosity of the ink and to prevent ink bleeding. In addition, the print quality can be improved regardless of the type of print medium.

  Further, the printing method of the present invention is a printing in which an ink is sprayed on the surface of a moving transfer body to form an image, and the ink sprayed on the transfer body is heated and dried or heat-cured to move synchronously with the transfer body. Transferring the ink of the transfer body to the printing medium when transporting the printing medium sandwiched between the body, and irradiating the ink transferred to the printing medium with ultraviolet rays to dry or cure ultraviolet rays; It is characterized by this.

  Therefore, the ink is held on the print medium in a state of high viscosity, the ink does not penetrate into the print medium, and the image is not destroyed, and the print quality is improved regardless of the type of the print medium. Can do.

  In the printing method of the present invention, ink is blown out toward the surface of the print medium to be conveyed, the blown-out ink is heated and dried or heat-cured, and ultraviolet rays are applied to the ink sprayed on the surface of the print medium. Irradiation to UV drying or UV curing is a feature.

  Therefore, the ink is held on the print medium in a state of high viscosity, the ink does not penetrate into the print medium, and the image is not destroyed, and the print quality is improved regardless of the type of the print medium. Can do.

  The printing machine according to the present invention also includes a sheet feeding device that sucks and feeds the sheets stacked on the sheet feeding table, and a sheet fed from the sheet feeding device between the impression cylinder and the blanket cylinder. A printing apparatus that transfers the image formed on the blanket cylinder onto a sheet of paper and prints it, and stacks the sheets that have been printed by the printing apparatus on a paper discharge tray. In the sheet-fed printing press, the printing apparatus includes: an inkjet head that forms an image by spraying ink on a surface of the blanket cylinder; and the ink sprayed from the inkjet head is heated and dried. A first drying device for heat curing; and a second drying device for ultraviolet drying or ultraviolet curing by irradiating the ink transferred from the blanket cylinder to the printing medium with ultraviolet rays. It is intended to.

  Accordingly, the ink formed on the surface of the blanket cylinder by the ink jet head is transferred to the sheet after being heated and dried or cured by the first drying device, so that the ink is transferred from the blanket cylinder to the sheet with high viscosity. Since the ink is transferred, the ink does not penetrate into the sheet and the image is maintained without being destroyed, and the print quality can be improved regardless of the type of the print medium.

  Further, the rotary printing press according to the present invention is formed on the blanket cylinder while feeding the web from the web, the web fed from the paper feeder being sandwiched between the impression cylinder and the blanket cylinder. A printing apparatus for transferring the printed image onto a web and printing, a folding apparatus for forming a fold by cutting and folding the web printed by the printing apparatus, and a fold formed by the folding apparatus. In a rotary printing press provided with a paper discharge device for discharging paper, the printing device sprays ink onto the surface of the blanket cylinder to form an image, and heat-drys the ink sprayed from the ink jet head. Alternatively, a first drying device that is heat-cured, and the ink transferred from the blanket cylinder to the web is irradiated with ultraviolet rays to dry the ultraviolet rays or ultraviolet rays. A second drying device for curing, is characterized in that it has a.

  Therefore, the ink formed on the surface of the blanket cylinder by the inkjet head is transferred to the web after being dried or cured by heating with the first drying device, so that the ink is transferred from the blanket cylinder to the web with a high viscosity. Thus, the ink does not penetrate into the web and the image is maintained without being destroyed, and the print quality can be improved regardless of the type of the web.

  Further, the printing machine of the present invention is formed on the blanket cylinder and conveys the sheet feeding device for supplying the printing medium and the printing medium fed from the sheet feeding device between the impression cylinder and the blanket cylinder. In a printing machine comprising: a plurality of printing apparatuses that perform printing by transferring a printed image to a printing medium; and a paper discharge apparatus that discharges the printing medium printed by the printing apparatus. A first printing device that performs printing using a second printing device that performs printing using an inkjet head, and the second printing device uses the ink sprayed from the inkjet head to the surface of the blanket cylinder. A first drying device that heat-drys or heat-cures, and a second drying device that irradiates the ink transferred from the blanket cylinder to the printing medium with ultraviolet rays to dry or cure ultraviolet rays. It is characterized in that it has a.

  Accordingly, the ink formed on the surface of the blanket cylinder by the ink jet head is transferred to the print medium after being dried by heating or heat-cured by the first drying device, so that the ink is transferred from the blanket cylinder to the print medium with a high viscosity. In other words, even if the print medium has already been printed, the ink does not penetrate into the print medium and the image is maintained without being destroyed, and the print quality can be improved.

  According to the printing apparatus, the printing method, the rotary printing machine, and the printing machine of the present invention, the ink is irradiated with infrared rays before being transferred to the printing medium and then primarily dried, and then the ink transferred to the printing medium is irradiated with ultraviolet rays. Therefore, it is possible to improve the printing quality regardless of the type of printing medium.

FIG. 1 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating a main part of the printing apparatus according to the first embodiment. FIG. 3A is a schematic diagram illustrating a printing method performed by the printing apparatus according to the first embodiment. FIG. 3B is a schematic diagram illustrating a printing method performed by the printing apparatus according to the first embodiment. FIG. 4 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to the second embodiment of the present invention. FIG. 5 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a third embodiment of the present invention. FIG. 6 is a schematic diagram illustrating a main part of a sheet-fed printing press provided with a printing apparatus according to Embodiment 4 of the present invention. FIG. 7 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a fifth embodiment of the present invention. FIG. 8 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a sixth embodiment of the present invention. FIG. 9 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to a seventh embodiment of the present invention. FIG. 10 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to an eighth embodiment of the present invention.

  Exemplary embodiments of a printing apparatus, a printing method, a rotary printing machine, and a printing machine 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, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a main part of the printing apparatus according to the first embodiment. FIG. 3B is a schematic diagram illustrating a printing method performed by the printing apparatus according to the first embodiment.

  As shown in FIG. 1, the offset sheet-fed printing press according to the first embodiment includes a paper feeding device 11, a transport device 12, a printing device 13, and a paper discharge device 14. In the present embodiment, a print sheet (print medium) S as a sheet that is stacked and placed on the sheet feeding device 11 is printed by a non-illustrated multicolor sheet-fed printing machine except for a predetermined area. The printing device 13 performs printing on a predetermined area of white paper. Note that the multicolor sheet-fed printing press has four printing units corresponding to, for example, four colors of black, cyan, magenta, and yellow. Each printing unit has substantially the same configuration, and includes an inking device, a plate cylinder, a blanket cylinder, and an impression cylinder. When the printing sheet S passes between the blanket cylinder and the impression cylinder, printing is performed from the blanket cylinder. Ink (printed image) is transferred to the sheet S and printing is performed.

  The paper feeder 11 described above has a paper feeder 21 and a separator device 22 as a paper feed mechanism. The paper feed tray 21 stacks and places the print sheets S, and the separator device 22 picks up and sends out a large number of print sheets S stacked on the paper feed tray 21 one by one from the top. is there. In this case, the paper feed table 21 can be moved up and down in response to the supply of the print sheet S so that the separator device 22 can maintain a substantially constant height relationship with the print sheet S.

  The conveying device 12 conveys the printing sheet S sent out from the paper feeding device 11 and positions it at a predetermined position, and supplies it to the printing device 13. In the conveying device 12, a feed roller 23 and a tailing roller 24 are disposed adjacent to each other adjacent to the sheet feeding device 11, and a conveying belt 26 wound around a plurality of guide rollers 25 is disposed. A front pad 27 is disposed adjacent to the printing device 13.

  In the printing apparatus 13, a blanket cylinder 31 and an impression cylinder (printing cylinder) 32 are rotatably supported by being in contact with each other up and down, while being in contact with the impression cylinder 32 and adjacent to the front pad 27, the intermediate cylinder 33 is rotatable. It is supported by. The blanket cylinder 31, the impression cylinder 32, and the intermediate cylinder 33 are gear-coupled so as to be able to rotate synchronously along the arrow direction, and can be rotated by a single motor (not shown). In this case, the blanket cylinder 31 is wound with a blanket having a surface formed of silicon in consideration of image releasability. Moreover, the impression cylinder 32 and the intermediate | middle cylinder 33 have the claw 32a and 33a (refer FIG. 2), respectively. The gripping claw 33 a of the intermediate cylinder 33 grasps and conveys the leading end portion (front end portion in the conveyance direction) of the printing sheet S positioned on the front pad 27 of the conveying device 12, and then the gripping claw of the impression cylinder 32. 32a grasps and conveys the leading end portion of the print sheet S released by the gripping claws 33a of the intermediate cylinder 33.

  An ink jet head 34 that forms an image by spraying water-based ink on the surface of the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31. The inkjet head 34 has a plurality of nozzles (not shown) arranged in the axial direction of the blanket cylinder 31, and can spray water-based ink on the entire area of the print sheet S in the width direction.

  The water-based ink used in the inkjet head 34 of this embodiment is a pigment, a UV curable resin, a vehicle component (for example, a prepolymer of acrylic acid, an oligomer, an acrylic acid monomer), and an ink that are solidified as a colorant. Therefore, it is composed of a catalyst (initiator, sensitizer), an additive, a water-soluble solvent and the like. The water-based ink is not limited to this component structure, and may be alcohol or a thermosetting resin instead of the water-soluble solvent.

  In addition, an image (water-based ink) formed on the blanket cylinder 31 is heated and dried or heat-cured on the outer periphery of the blanket cylinder 31 and positioned downstream of the inkjet head 34 in the rotation direction of the blanket cylinder 31. A first lamp 35 is provided as a drying device. Further, on the outer periphery of the impression cylinder 32, the impression cylinder 32 is positioned downstream of the contact position between the impression cylinder 32 and the blanket cylinder 31 in the rotation direction of the impression cylinder 32, and from the blanket cylinder 31 to the printing surface of the printing sheet S. A second lamp 36 is provided as a second drying device for drying or ultraviolet curing the transferred image (water-based ink). In this case, the first lamp 35 is an infrared lamp that can irradiate infrared (Infrared), and the second lamp 36 is an ultraviolet lamp that can irradiate ultraviolet (Ultraviolet).

  The blanket cylinder 31 is located on the outer periphery of the blanket cylinder 31 at a position downstream of the contact position with the impression cylinder 32 in the rotational direction of the blanket cylinder 31 and upstream of the inkjet head 34 in the rotational direction of the blanket cylinder 31. After the image formed on the surface of the cylinder 31 is transferred to the printing sheet S, a cleaning roller 37 is provided as a cleaning device that removes and cleans ink remaining on the surface of the blanket cylinder 31. The cleaning roller 37 removes water-based ink remaining on the surface of the blanket cylinder 31 by rotating with the blanket cylinder 31 or rotating in the reverse direction.

  The paper discharge device 14 conveys the print sheets S printed by the printing device 13 and stacks them up and down in an aligned state. The paper discharge device 14 includes a chain gripper 28 that conveys the print sheet S, a paper discharge tray 29 on which the printed print sheets S are stacked, and a paper pad 30 that aligns the print sheets S. The chain gripper 28 has a plurality of gripping claws 28 a that grip the leading end portion of the printing sheet S, receives the printing sheet S from the impression cylinder 32 of the printing apparatus 13, and conveys the printing sheet S to a predetermined position above the paper discharge tray 29. To do. The discharge table 29 can be lowered continuously or stepwise so that the drop distance of the print sheet S becomes substantially constant when the height of the top surface of the uppermost stage rises as the print sheets S are stacked. It has become. The paper pad 30 regulates the leading end position in the traveling direction of the printing sheet S.

  Here, the printing method by the offset sheet-fed printing press of Example 1 comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 21 of the paper feeder 11 are picked up one by one from the top by the separator device 22 and sent to the transport device 12. Next, the transport device 12 After the sheets S are positioned by the front pads 27, they are sequentially supplied to the printing apparatus 13.

  Subsequently, in the printing apparatus 13, the inkjet head 34 forms a predetermined image on the surface of the blanket cylinder 31 by spraying water-based ink from a plurality of nozzles toward the blanket cylinder 31. While the water-based ink adheres to the blanket cylinder 31 and is transferred to the printing sheet S, the image (water-based ink) formed on the blanket cylinder 31 is heated and dried by infrared rays (heat) from the first lamp 35.

  On the other hand, the intermediate cylinder 33 receives the print sheet S sent out from the conveying device 12, transfers it to the impression cylinder 32, and the impression sheet 32 conveys the print sheet S to a contact position with the blanket cylinder 31. When the printing sheet S is conveyed by the impression cylinder 32 and reaches the contact position with the blanket cylinder 31, an image of the blanket cylinder 31 is printed when passing between the cylinders 31 and 32 while being pressed. S is transferred to S. In this case, the image (water-based ink) of the printing sheet S is primarily dried by the infrared rays from the first lamp 35, that is, semi-dried, and an ideal semi-dry state can be realized. Thereafter, the image that moves with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying by the ultraviolet rays from the second lamp 36.

  The blanket cylinder 31 on which the image on the surface has been transferred to the printing sheet S is brought into contact with the cleaning roller 37, whereby the aqueous ink remaining on the surface is removed.

  The above-described drying of the image (water-based ink) will be described in detail. As shown in FIG. 2, the water-based ink (outlined) of the image that is sprayed from the inkjet head 34 onto the surface of the blanket cylinder 31 and formed on the surface of the blanket cylinder 31 is in a low viscosity state in the region T1. The low-viscosity image water-based ink that has been moved by the rotation of the blanket cylinder 31 is heated by the infrared rays from the first lamp 35 to become a semi-dry water-based ink (oblique line) in the region T2. The semi-dry water-based ink on the surface of the blanket cylinder 31 is transferred to the surface of the printing sheet S by a predetermined nip acting between the blanket cylinder 31 and the printing sheet S conveyed by the impression cylinder 32. Is done. When the impression cylinder 32 rotates and the printing sheet S moves, the water-based ink of the semi-dried image moved with the printing sheet S is completely dried in the region T3 by the ultraviolet rays from the second lamp 36. (Black paint).

  At this time, the first lamp 35 can irradiate infrared rays and the second lamp 36 can irradiate ultraviolet rays, while the water-based ink includes pigments, ultraviolet curable resins, vehicle components, catalysts, additives, water-soluble solvents. Therefore, the components to be cured (dried) are different between primary drying and secondary drying. That is, as shown in FIG. 3A, the water-based ink of the image formed on the surface of the blanket cylinder 31 mainly includes the pigment A, the ultraviolet curable resin (including the vehicle component, the catalyst, and the additive) B, the water-soluble ink. And an organic solvent C. In the figure, the pigment A, the ultraviolet curable resin B, and the water-soluble solvent C are shown in a separated state, but they are actually mixed.

  In this state, first, when the first lamp 35 irradiates infrared rays toward the water-based ink on the blanket cylinder 31, the water-soluble solvent C in the water-based ink is heated and evaporates. The ink is only pigment A and ultraviolet curable resin B. The aqueous ink composed of the pigment A and the ultraviolet curable resin B is transferred from the blanket cylinder 31 to the printing sheet S conveyed by the impression cylinder 32. Next, as shown in FIG. 3-2, when the second lamp 36 irradiates ultraviolet rays toward the aqueous ink on the printing sheet S supported by the impression cylinder 32, the ultraviolet curable resin B in the aqueous ink is cured. Thus, the curable resin D is obtained, and the pigment A is fixed.

  In this case, the infrared rays irradiated from the first lamp 35 have a wavelength of 0.7 μm to 1.0 mm (1000 μm), and the water-soluble solvent C in the water-based ink can be heated and evaporated. On the other hand, the ultraviolet rays irradiated from the second lamp 36 have a wavelength of 10 nm to 400 nm, and the ultraviolet curable resin B in the water-based ink can be cured. More specifically, when the water-based ink is irradiated with ultraviolet rays, the initiator as a catalyst is activated to form a reaction starting point, which activates the double bond of the acrylic acid prepolymer, and acrylic acid. The prepolymers are chemically bonded (crosslinked). Eventually, the acrylic acid prepolymer is linked in a network, and the molecules cannot move freely, and the water-based ink changes from a liquid to a solid and becomes a cured film.

  Thereafter, returning to FIG. 1, the printing sheet S printed by the printing device 13 is sent out from the printing device 13 to the paper discharge device 14, and the chain gripper 28 conveys it while holding the leading end of the printing sheet S. Then, they are stacked on the paper discharge tray 29.

  As described above, in the offset sheet-fed printing press according to the first embodiment, the rotatable impression cylinder 32 can be rotated in synchronization with the impression cylinder 32 and the printing sheet can be rotated between the impression cylinder 32. A blanket cylinder 31 that can be transported across S, an inkjet head 34 that forms an image by spraying water-based ink on the surface of the blanket cylinder 31, and an image formed on the surface of the blanket cylinder 31 by the inkjet head 34 is irradiated with infrared rays. The first lamp 35 for drying and the second lamp 36 for drying the image transferred from the blanket cylinder 31 to the printing sheet S by irradiating with ultraviolet rays are provided.

  Accordingly, the image formed on the surface of the blanket cylinder 31 by the ink jet head 34 is primarily dried by infrared rays from the first lamp 35 and then transferred to the printing sheet S. Therefore, the image is printed from the blanket cylinder 31 with high viscosity. It is transferred to the sheet S. Therefore, the water-based ink does not penetrate into the printing sheet S and is maintained without distorting the image, so that the printing accuracy can be improved. Specifically, it is possible to improve dot gain stability by improving the viscosity of the ink and to prevent ink bleeding. In addition, it is possible to suppress a difference in printing accuracy depending on the paper type.

  In this case, the water-based ink includes a pigment, an ultraviolet curable resin, a vehicle component, a catalyst, an additive, a water-soluble solvent, and the like, the first lamp 35 can irradiate infrared rays, and the second lamp 36 irradiates ultraviolet rays. It is possible. Therefore, by drying the water-based ink (image) sequentially using two types of electromagnetic waves having different wavelengths, the water-based ink can be reliably dried.

  FIG. 4 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to the second embodiment of the present 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.

  As shown in FIG. 4, the offset sheet-fed printing press according to the second embodiment includes a paper feeding device 11, a transport device 12, a printing device 13, and a paper discharge device 14. Here, the paper feeding device 11, the transport device 12, and the paper discharge device 14 are the same as those in the first embodiment described above, and only the configuration of the printing device 13 is different.

  That is, in the printing apparatus 13, an ink jet head 34 that forms an image by spraying water-based ink on the surface of the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31. A preheating lamp 38 as a preheating device that heats the surface of the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31 and is located upstream of the inkjet head 34 in the rotation direction of the blanket cylinder 31. A first lamp 35 for drying an image (water-based ink) formed on the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31 and is located downstream of the inkjet head 34 in the rotational direction of the blanket cylinder 31. It has been. Further, on the outer periphery of the impression cylinder 32, the impression cylinder 32 is located on the downstream side in the rotation direction of the impression cylinder 32 from the contact position between the impression cylinder 32 and the blanket cylinder 31, and is transferred from the blanket cylinder 31 to the printing surface of the printing sheet S. A second lamp 36 is provided for drying the printed image (water-based ink). In this case, the preheating lamp 38 is a halogen lamp or an infrared lamp.

  Here, the printing method by the offset sheet-fed printing press of Example 2 comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 21 of the paper feeder 11 are picked up one by one from the top by the separator device 22 and sent to the transport device 12. Next, the transport device 12 After the sheets S are positioned by the front pads 27, they are sequentially supplied to the printing apparatus 13.

  Subsequently, in the printing apparatus 13, the surface of the blanket cylinder 31 is preheated by the light heat of the preheating lamp 38, and the inkjet head 34 sprays water-based ink from a plurality of nozzles toward the preheated blanket cylinder 31. A predetermined image is formed on the surface of the blanket cylinder 31. At this time, the water-based ink attached to the blanket cylinder 31 is dried by applying heat from the high-temperature blanket cylinder 31. The image (water-based ink) formed on the blanket cylinder 31 is heated and dried by infrared rays (heat) from the first lamp 35.

  On the other hand, the intermediate cylinder 33 receives the print sheet S sent out from the conveying device 12, transfers it to the impression cylinder 32, and the impression sheet 32 conveys the print sheet S to a contact position with the blanket cylinder 31. When the printing sheet S is conveyed by the impression cylinder 32 and reaches the contact position with the blanket cylinder 31, an image of the blanket cylinder 31 is printed when passing between the cylinders 31 and 32 while being pressed. S is transferred to S. The image moving with the rotation of the impression cylinder 32 is secondarily dried, that is, main-dried by the ultraviolet rays from the second lamp 36.

  More specifically, the water-based ink of the image formed on the surface of the blanket cylinder 31 is irradiated with infrared rays from the first lamp 35, whereby the water-soluble solvent C in the water-based ink is heated and evaporated, and the blanket. The water-based ink on the surface of the cylinder 31 is only the pigment A and the ultraviolet curable resin B. And after the water-based ink which consists of this pigment A and the ultraviolet curable resin B is transcribe | transferred to the printing sheet S, the water-based ink of the image formed in the printing sheet S is irradiated with an ultraviolet-ray from the 2nd lamp | ramp 36. The ultraviolet curable resin B in the water-based ink is cured to become the curable resin D, and the pigment A is fixed.

  Thereafter, the printing sheet S printed by the printing device 13 is sent out from the printing device 13 to the paper discharge device 14, and the chain gripper 28 conveys the print sheet S while holding the leading end portion thereof, and the paper discharge table 29. Stack up.

  As described above, in the offset sheet-fed printing press according to the second embodiment, the rotatable impression cylinder 32 can be rotated in synchronization with the impression cylinder 32 and the printing sheet can be rotated between the impression cylinder 32. A blanket cylinder 31 that can be transported across S, an inkjet head 34 that forms an image by spraying water-based ink onto the surface of the blanket cylinder 31, a preheating lamp 38 that heats the blanket cylinder 31, and an infrared image on the image of the blanket cylinder 31 Are provided, and a first lamp 35 for drying by irradiating the image and a second lamp 36 for irradiating the image of the print sheet S by irradiating with ultraviolet rays for drying.

  Accordingly, when the blanket cylinder 31 is heated in advance by the preheating lamp 38, the water-based ink of the image formed on the surface of the blanket cylinder 31 by the inkjet head 34 is assisted to dry by the high-temperature blanket. By being primarily dried by the lamp 35, water in the water-based ink can be evaporated to form an ideal semi-dry state. In this case, the output of the first lamp 35 can be reduced by using the preheating lamp 38.

  FIG. 5 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a third embodiment of the present 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.

  As shown in FIG. 5, the offset sheet-fed printing press according to the third embodiment includes a paper feeding device 11, a transport device 12, a printing device 13, and a paper discharge device 14. Here, the paper feeding device 11, the transport device 12, and the paper discharge device 14 are the same as those in the first embodiment described above, and only the configuration of the printing device 13 is different.

  That is, in the printing apparatus 13, an ink jet head 34 that forms an image by spraying water-based ink on the surface of the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31. A first lamp 39 as a first drying device for drying an image (water-based ink) formed on the blanket cylinder 31 is provided inside the blanket cylinder 31. Further, on the outer periphery of the impression cylinder 32, the impression cylinder 32 is located on the downstream side in the rotation direction of the impression cylinder 32 from the contact position between the impression cylinder 32 and the blanket cylinder 31, and is transferred from the blanket cylinder 31 to the printing surface of the printing sheet S. A second lamp 36 is provided for drying the printed image (water-based ink). Here, the 1st lamp | ramp 39 can irradiate infrared rays.

  Here, the printing method by the offset sheet-fed printing press of Example 3 comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 21 of the paper feeder 11 are picked up one by one from the top by the separator device 22 and sent to the transport device 12. Next, the transport device 12 After the sheets S are positioned by the front pads 27, they are sequentially supplied to the printing apparatus 13.

  Subsequently, in the printing apparatus 13, the inkjet head 34 forms a predetermined image on the surface of the blanket cylinder 31 by spraying water-based ink from a plurality of nozzles toward the blanket cylinder 31. At this time, the image (water-based ink) formed on the blanket cylinder 31 is heated and dried by infrared rays (heat) from the first lamp 39 inside.

  On the other hand, the intermediate cylinder 33 receives the print sheet S sent out from the conveying device 12, transfers it to the impression cylinder 32, and the impression sheet 32 conveys the print sheet S to a contact position with the blanket cylinder 31. When the printing sheet S is conveyed by the impression cylinder 32 and reaches the contact position with the blanket cylinder 31, an image of the blanket cylinder 31 is printed when passing between the cylinders 31 and 32 while being pressed. S is transferred to S. Then, the image on the printing sheet S that moves with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying by the ultraviolet rays from the second lamp 36.

  Thereafter, the printing sheet S printed by the printing device 13 is sent out from the printing device 13 to the paper discharge device 14, and the chain gripper 28 conveys the print sheet S while holding the leading end portion thereof, and the paper discharge table 29. Stack up.

  As described above, in the offset sheet-fed printing press according to the third embodiment, the rotatable impression cylinder 32 can be rotated in synchronization with the impression cylinder 32 and can be rotated between the impression cylinder 32 and the printing sheet. A blanket cylinder 31 that can be transported across S, an inkjet head 34 that forms an image by spraying aqueous ink onto the surface of the blanket cylinder 31, and an infrared image that is provided inside the blanket cylinder 31 to irradiate the image on the surface. A first lamp 39 for drying and a second lamp 36 for drying by irradiating the image of the printing sheet S with ultraviolet rays are provided.

  Accordingly, the image formed on the surface of the blanket cylinder 31 by the ink jet head 34 is primarily dried from the back side by the infrared rays from the first lamp 39 and transferred to the printing sheet S. It will be transferred to the printing sheet S, and dot gain stability can be improved by improving the viscosity of the ink, ink bleeding can be prevented, and the difference in printing accuracy depending on the paper type can be suppressed. it can.

  FIG. 6 is a schematic diagram illustrating a main part of a sheet-fed printing press provided with a printing apparatus according to Embodiment 4 of the present 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 printing apparatus of the sheet-fed printing press of Example 4, as shown in FIG. 6, water-based ink is applied to the printing surface of the printing sheet S conveyed by the impression cylinder 32 around the outer periphery of the impression cylinder 32 as a conveyance body. An ink jet head 34 for forming an image by spraying is provided. A first lamp 40 is provided on the outer periphery of the impression cylinder 32 as a first drying device that dries the water-based ink that is blown from the inkjet head 34 and does not reach the printing sheet S. In addition, a second lamp 36 that dries an image (water-based ink) formed on the printing surface of the printing sheet S, located on the outer periphery of the impression cylinder 32 and downstream of the inkjet head 34 in the rotation direction of the impression cylinder 32. Is provided. Here, the 1st lamp | ramp 40 can irradiate infrared rays.

  Here, the printing method by the offset sheet-fed printing press of Example 4 comprised in this way is demonstrated.

  The intermediate cylinder 33 transfers the printing sheet S to the impression cylinder 32, and the printing sheet S is conveyed by the impression cylinder 32, and the printing sheet S reaches a position facing the inkjet head 34. Here, the inkjet head 34 forms a predetermined image on the printing surface of the printing sheet S by spraying water-based ink from a plurality of nozzles toward the printing surface of the printing sheet S conveyed by the impression cylinder 32. At this time, the 1st lamp | ramp 40 heat-drys this aqueous ink by irradiating infrared rays with respect to the aqueous ink before blowing out from the inkjet head 34 and reaching the printing sheet S.

  Thereafter, the image on the printing sheet S that moves with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying, by the ultraviolet rays from the second lamp 36.

  As described above, in the sheet-fed printing press of the fourth embodiment, the impression cylinder 32 that can convey the printing sheet S, and the inkjet head that forms an image by spraying water-based ink onto the printing sheet S held by the impression cylinder 32. 34, a first lamp 40 for drying the water-based ink before being sprayed from the inkjet head 34 onto the print sheet S, and a second lamp 36 for drying the image of the print sheet S by irradiating it with ultraviolet rays.

  Therefore, the image formed on the printing sheet S by the inkjet head 34 is primarily dried by infrared rays from the first lamp 40 before being sprayed, so that a highly accurate aqueous ink image is formed on the surface of the printing sheet S. In addition to improving dot gain stability by improving the viscosity of the ink, it is possible to prevent ink bleeding and to suppress differences in printing accuracy depending on the paper type.

  FIG. 7 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a fifth embodiment of the present 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.

  As shown in FIG. 7, the offset sheet-fed printing press according to the fifth embodiment includes a paper feeding device 41, a transport device 42, a printing device 43, and a paper discharge device 44.

  The paper feeding device 41 includes a paper feeding table 51 and a separator device 52 as a paper feeding mechanism. The paper feed tray 51 stacks and places the print sheets S, and the separator device 52 picks up and sends out a large number of print sheets S stacked on the paper feed stand 51 one by one from the top. Is. In this case, the paper feed table 51 can be moved up and down in response to the supply of the printing sheet S so that the separator device 52 can maintain the positional relationship with the printing sheet S at a substantially constant height.

  The conveying device 42 conveys the printing sheet S sent out from the paper feeding device 41 and positions it at a predetermined position, and supplies it to the printing device 43. In this conveying device 42, a feed roller 53 and a gripping roller 54 are disposed in contact with each other adjacent to the paper feeding device 41, and a conveying belt 56 wound around a plurality of guide rollers 55 is disposed for printing. A front pad 57 is disposed adjacent to the device 43.

  The printing apparatus 43 includes four printing units 61, 62, 63, corresponding to four colors of black, black, magenta, and yellow so that color printing can be realized. 64 and a printing unit 65 that performs printing using an inkjet head described later. Each of the printing units 61, 62, 63, and 64 has substantially the same configuration, and includes an inking device (not shown), plate cylinders 61a, 62a, 63a, and 64a, blanket cylinders 61b, 62b, 63b, and 64b, and an impression cylinder 61c. , 62c, 63c, 64c. The plate cylinders 61a, 62a, 63a, 64a, the blanket cylinders 61b, 62b, 63b, 64b and the impression cylinders 61c, 62c, 63c, 64c are in contact with each other in this order from the upper side to the lower side along the vertical direction. The ink is supplied to the blanket cylinders 61b, 62b, 63b, 64b via the plate cylinders 61a, 62a, 63a, 64a by the inking device, and the blanket cylinders 61b, 62b, 63b, 64b and the impression cylinders 61c, 62c are supplied. , 63c, 64c, the ink (printed image) is transferred from the blanket cylinders 61b, 62b, 63b, 64b to the print sheet S. An intermediate drum 66 is provided between the pressure drums 61c, 62c, 63c, and 64c.

  Further, the printing unit 65 has substantially the same configuration as the printing apparatus 13 described in the first embodiment. That is, the blanket cylinder 31 and the impression cylinder 32 are rotatably supported in contact with each other up and down, and the intermediate cylinder 66 is rotatably supported in contact with the impression cylinder 32. The impression cylinder 32 and the intermediate cylinder 66 each have a gripping claw (not shown), and the gripping claw of the intermediate cylinder 66 grasps and conveys the leading end portion of the printing sheet S. The claw grips and conveys the leading end portion of the print sheet S released by the claw of the intermediate cylinder 66.

  Around the outer periphery of the blanket cylinder 31, an ink jet head 34 that forms an image by spraying water-based ink on the surface of the blanket cylinder 31 is provided. A first lamp 35 for drying an image (water-based ink) formed on the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31 and is located downstream of the inkjet head 34 in the rotation direction of the blanket cylinder 31. Yes. Further, on the outer periphery of the impression cylinder 32, the impression cylinder 32 is positioned downstream of the contact position between the impression cylinder 32 and the blanket cylinder 31 in the rotation direction of the impression cylinder 32, and from the blanket cylinder 31 to the printing surface of the printing sheet S. A second lamp 36 for drying the transferred image (water-based ink) is provided. A cleaning roller 37 for cleaning the surface of the blanket cylinder 31 is provided on the outer periphery of the blanket cylinder 31.

  The paper discharge device 44 conveys the print sheets S printed by the printing device 43 and stacks them up and down in an aligned state. The paper discharge device 44 includes a chain gripper 71 that conveys the print sheet S, a paper discharge base 72 on which the printed print sheets S are stacked, and a paper pad 73 that aligns the print sheets S. The chain gripper 71 has a plurality of gripping claws 71 a that grip the leading end of the printing sheet S, receives the printing sheet S from the impression cylinder 32 of the printing apparatus 43, and conveys the printing sheet S to a predetermined position above the paper discharge table 72. To do. The discharge table 72 can be lowered continuously or stepwise so that the drop distance of the print sheet S is substantially constant when the height of the top surface of the uppermost stage rises as the print sheets S are stacked. It has become. The paper pad 73 regulates the leading end position in the traveling direction of the printing sheet S.

  Here, the printing method by the offset sheet-fed printing machine of Example 5 comprised in this way is demonstrated.

  First, the print sheets S stacked on the paper feed tray 51 of the paper feed device 41 are picked up one by one from the top by the separator device 52 and sent to the transport device 42. Next, the transport device 42 After the sheets S are positioned by the front pads 57, they are sequentially supplied to the printing device 43.

  Subsequently, the four printing units 61, 62, 63, and 64 print the four colors of black, indigo, red, and yellow on the printing sheet S in the printing apparatus 43. At this time, each of the printing units 61, 62, 63, and 64 performs printing on a portion excluding the predetermined area, and the printing unit 65 performs printing on the predetermined area of the blank paper.

  That is, in the printing unit 65, the inkjet head 34 forms a predetermined image on the surface of the blanket cylinder 31 by spraying water-based ink from a plurality of nozzles toward the blanket cylinder 31. While the water-based ink adheres to the blanket cylinder 31 and is transferred to the printing sheet S, the image (water-based ink) formed on the blanket cylinder 31 is heated and dried by infrared rays (heat) from the first lamp 35.

  On the other hand, the intermediate cylinder 33 delivers the printing sheet S to the impression cylinder 32, and the impression sheet 32 conveys the printing sheet S to a contact position with the blanket cylinder 31. When the printing sheet S is conveyed by the impression cylinder 32 and reaches the contact position with the blanket cylinder 31, an image of the blanket cylinder 31 is printed when passing between the cylinders 31 and 32 while being pressed. S is transferred to S. In this case, the image (water-based ink) of the printing sheet S is primarily dried by the infrared rays from the first lamp 35, that is, semi-dried, and an ideal semi-dry state can be realized. Thereafter, the image that moves with the rotation of the impression cylinder 32 is subjected to secondary drying, that is, main drying by the ultraviolet rays from the second lamp 36.

  Specifically, the water-based ink of the image formed on the surface of the blanket cylinder 31 is irradiated with infrared rays from the first lamp 35, whereby the water-soluble solvent in the water-based ink is heated and evaporated, and the blanket cylinder The water-based ink on the surface 31 includes only a pigment and an ultraviolet curable resin. And after the water-based ink which consists of this pigment and ultraviolet curable resin is transcribe | transferred to the printing sheet S, the water-based ink of the image formed in the printing sheet S is water-based by irradiating an ultraviolet-ray from the 2nd lamp | ramp 36. The ultraviolet curable resin in the ink is cured to become a curable resin, and the pigment is fixed.

  The blanket cylinder 31 having the image transferred to the printing sheet S on the surface comes into contact with the cleaning roller 37, so that the water-based ink remaining on the surface is removed.

  Thereafter, the printing sheet S printed by the printing device 43 is sent out from the printing device 43 to the paper discharge device 44, and the chain gripper 71 conveys the paper sheet S while holding the leading end of the print sheet S, and the paper discharge table 72. Stack up.

  As described above, in the offset sheet-fed printing press according to the fifth embodiment, the printing unit 65 is disposed on the downstream side of the printing units 61, 62, 63, and 64 for four-color printing. A rotatable impression cylinder 32, a blanket cylinder 31 that can be rotated synchronously in contact with the impression cylinder 32, and can be conveyed with the printing sheet S sandwiched between the impression cylinder 32, and the surface of the blanket cylinder 31 An inkjet head 34 that forms an image by spraying water-based ink on the surface, a first lamp 35 that irradiates an image formed on the surface of the blanket cylinder 31 by the inkjet head 34 and drys it, and a printing sheet S from the blanket cylinder 31. And a second lamp 36 for drying by irradiating the image transferred to UV with ultraviolet rays.

  Therefore, the image formed on the surface of the blanket cylinder 31 by the ink jet head 34 is primarily dried by the infrared rays from the first lamp 35 and transferred to the printing sheet S. Therefore, the printing sheet from the blanket cylinder 31 is high in viscosity. As a result, the dot gain stability can be improved by improving the viscosity of the ink, ink bleeding can be prevented, and the difference in printing accuracy depending on the paper type can be suppressed.

  FIG. 8 is a schematic configuration diagram illustrating a sheet-fed printing press including a printing apparatus according to a sixth embodiment of the present 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.

  As shown in FIG. 8, the offset sheet-fed printing press according to the sixth embodiment includes a paper feeding device 41, a transport device 42, a printing device 43, and a paper discharge device 44. Here, the paper feeding device 41, the conveying device 42, and the paper discharging device 44 are the same as those in the fifth embodiment described above, and only the printing device 43 is different.

  In other words, the printing apparatus 43 has four printing units 61, 62, 4 corresponding to four colors of black, black, magenta, and yellow so that color printing can be realized. 63, 64. Each of the printing units 61, 62, 63, 64 has substantially the same configuration, and has substantially the same configuration as the printing device 43 described in the fifth embodiment. That is, blanket cylinders 61b, 62b, 63b, 64b and impression cylinders 61c, 62c, 63c, 64c are provided.

  In addition, inkjet heads 34a, 34b, 34c, 34d corresponding to four colors are provided on the outer periphery of each blanket cylinder 61b, 62b, 63b, 64b. The blanket cylinders 61b, 62b, 63b, 64b are provided with first lamps 35a, 35b, 35c, 35d. Second lamps 36a, 36b, 36c, and 36d are provided on the outer periphery of the impression cylinders 61c, 62c, 63c, and 64c.

  Therefore, first, when the printing sheet S of the paper feeding device 41 is supplied to the printing device 43 via the conveying device 42, the printing device 43 uses the four printing units 61, 62, 63, and 64 to print the printing sheet. For S, four colors of black, indigo, red and yellow are printed.

  That is, in the printing unit 61, the inkjet head 34a blows black aqueous ink toward the blanket cylinder 61b, thereby forming a predetermined image on the surface of the blanket cylinder 61b. While the water-based ink adheres to the blanket cylinder 61b and is transferred to the printing sheet S, the image (water-based ink) formed on the blanket cylinder 61b is heated and dried by infrared rays (heat) from the first lamp 35a.

  On the other hand, the intermediate cylinder 33 transfers the print sheet S to the impression cylinder 61c, and the impression sheet 61c conveys the print sheet S to a contact position with the blanket cylinder 61b. When the printing sheet S is conveyed to the impression cylinder 61c and reaches the contact position with the blanket cylinder 61b, an image of the blanket cylinder 61b is printed when passing between the cylinders 61b and 61c while being pressed. S is transferred to S. Thereafter, the image moving with the rotation of the impression cylinder 61c is secondarily dried by the ultraviolet rays from the second lamp 36a, that is, the main drying is performed, and the black printing is finished.

  Similarly, indigo, red, and yellow are printed by the remaining three printing units 62, 63, and 64. Thereafter, the print sheet S printed by the printing device 43 is sent to the paper discharge device 44 and stacked on the paper discharge table 72.

  As described above, in the offset sheet-fed printing machine of the sixth embodiment, as the printing units 61, 62, 63, 64 for four-color printing, the impression cylinders 61c, 62c, 63c, 64c and the blanket cylinders 61b, 62b, Ink jet heads 34a, 34b, 34c, 34d for forming images by spraying aqueous ink onto the surfaces of the blanket cylinders 61b, 62b, 63b, 64b, and blanket cylinders 61b, 62b, 63b, First lamps 35a, 35b, 35c, 35d for irradiating the surface image of 64b with infrared rays and drying, and second lamps 36a, 36b, 36c, 36d for irradiating the image of the print sheet S with ultraviolet rays to dry the images. Provided.

  Therefore, the images formed on the surfaces of the blanket cylinders 61a, 62b, 63b, and 64b by the inkjet heads 34a, 34b, 34c, and 34d in the printing units 61, 62, 63, and 64 are the first lamps 35a, 35b, and 35c. , 35d are primarily dried by the infrared rays and transferred to the printing sheet S. Therefore, the transfer is performed from the blanket cylinders 61a, 62b, 63b, and 64b to the printing sheet S in a high viscosity state, thereby improving the viscosity of the ink. The dot gain stability can be improved, ink bleeding can be prevented, and the difference in printing accuracy depending on the paper type can be suppressed.

  FIG. 9 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to a seventh embodiment of the present invention.

  The offset rotary printing press of Example 7 is a rotary printing press using water-based ink, and as shown in FIG. 9, a paper feeding device 81, an infeed device 82, a printing device 83, and a drying device 84. , A cooling device 85, a web pass device 86, a folding device 87, and a paper discharge device 88.

  The paper feeding device 81 has a reel stand on which two winding bodies (web rolls) are mounted. The web (printing medium) W that is drawn out from one winding body and travels is transferred to the other winding body (web roll). By connecting to the web W of the winding body, it has a paper splicing device that can continuously supply the web. The infeed device 82 supplies the web W of the paper feeding device 81 to the printing device 83 side.

  The printing apparatus 83 has four printing units 91, 92, 93, and 94 for each of four inks (black, indigo, red, and yellow) and a printing unit 95 that performs printing using an inkjet head described later on the web. It is arranged side by side along the direction. Each printing unit 91, 92, 93, 94 is a double-sided printing machine that prints on the front and back surfaces of the web W at the same time, and only the ink colors (black, indigo, red, yellow) used are different. The configuration is almost the same. That is, each printing unit 91, 92, 93, 94 is rotatably supported by an ink fountain, an ink base roller, a delivery roller, a kneading roller, a reciprocating roller, an ink application roller, a plate cylinder, and a blanket cylinder in series. The configuration is arranged symmetrically in the vertical direction. Then, when the web W passes between the opposing blanket cylinders, ink (printed image) is transferred from each blanket cylinder to the front and back of the web W.

  Further, the printing unit 95 has substantially the same configuration as the printing apparatus 13 described in the first embodiment. That is, the upper blanket cylinder 101 and the lower blanket cylinder 102 are rotatably supported in contact with each other up and down, and the web W is sandwiched and conveyed between the blanket cylinders 101 and 102. In this embodiment, since the printing unit 95 is a double-sided printing machine, the blanket cylinder 102 is the printing body of the present invention for the blanket cylinder 101, and the blanket cylinder 101 functions as the printing body of the present invention for the blanket cylinder 102. To do.

  In the outer periphery of the blanket cylinders 101 and 102, inkjet heads 103 and 104 for forming an image by spraying water-based ink on the surfaces of the blanket cylinders 101 and 102 are provided. In the outer periphery of the blanket cylinders 101 and 102, first lamps 105 and 106 are provided as a first drying device for drying an image (water-based ink) formed on the blanket cylinders 101 and 102. Second lamps 107 and 108 as second drying devices for drying the image (water-based ink) transferred from the blanket cylinders 101 and 102 onto the printing surface of the web W are provided downstream of the contact portions of the blanket cylinders 101 and 102. Is provided. In addition, cleaning rollers (cleaning devices) 109 and 110 for cleaning the surfaces of the blanket cylinders 101 and 102 are provided on the outer periphery of the blanket cylinders 101 and 102.

  The drying device 84 is for drying the ink on the web W printed by the printing device 83, and the cooling device 85 is suitable for the web W that stores excessive heat after drying in the drying device 84. It cools to a certain temperature. The web pass device 86 conveys the dried and cooled web W, and the folding device 87 cuts the web W after being vertically folded and folds it to a predetermined size to form a fold. The paper discharge device 88 is for carrying out the folded signatures out of the apparatus.

  Here, the printing method by the rotary offset printing press of Example 7 comprised in this way is demonstrated.

  First, the roll-shaped web W is pulled out from the winding body by the paper feeding device 81 and supplied to the printing device 83 by the infeed device 82. Subsequently, the four printing units 91, 92, 93, and 94 print four colors of black, indigo, red, and yellow on the web W by the printing device 83. At this time, each of the printing units 91, 92, 93, and 94 performs printing on a portion excluding the predetermined area, and the printing unit 95 performs printing on the predetermined area of the blank paper.

  That is, in the printing unit 95, the ink jet heads 103 and 104 spray a water-based ink toward the blanket cylinders 101 and 102, thereby forming a predetermined image on the surfaces of the blanket cylinders 101 and 102. While the water-based ink adheres to the blanket cylinders 101 and 102 and is transferred to the web W, the image (water-based ink) formed on the blanket cylinders 101 and 102 is caused by infrared rays (heat) from the first lamps 105 and 106. Heated to dry.

  On the other hand, when the web W to be transported is transported to a position where the upper and lower blanket cylinders 101 and 102 are in contact with each other, the image of each blanket cylinder 101 and 102 passes through while being pressed between the cylinders 101 and 102. Is transferred to the web W. At this time, the image (water-based ink) transferred to the web W is dried (primary drying or semi-drying) by infrared rays from the first lamps 105 and 106. Thereafter, the image that moves as the web W is conveyed is subjected to secondary drying, that is, main drying, by the ultraviolet rays from the second lamps 107 and 108.

  The blanket cylinders 101 and 102 on which the image is transferred to the web W come into contact with the cleaning rollers 109 and 110, so that the water-based ink remaining on the surface is removed.

  Thereafter, the web W printed by the printing device 83 is sent from the printing device 83 to the drying device 84, where the ink is dried, cooled by the cooling device 85, and conveyed through the web pass device 86. Folds are created by the folding device 87 and carried out by the paper discharge device 88.

  As described above, in the rotary offset printing press according to the seventh embodiment, the printing unit 95 is disposed on the downstream side of the printing units 91, 92, 93, and 94 for four-color printing. Blanket cylinders 101 and 102 that can rotate synchronously in contact with each other and can be conveyed with the web W interposed therebetween, and ink jet heads 103 and 104 that form images by spraying water-based ink on the surfaces of the blanket cylinders 101 and 102. And first lamps 105 and 106 for drying the image of the surface of the blanket cylinders 101 and 102 by irradiating with infrared rays, and second lamps 107 and 108 for drying the image of the web W by irradiating with ultraviolet rays. .

  Accordingly, the aqueous ink of the image formed on the surface of the blanket cylinder 101, 102 by the inkjet heads 103, 104 in the printing unit 95 is primarily dried by the infrared rays from the first lamps 105, 106 and transferred to the web W. Therefore, the blanket cylinders 101 and 102 are transferred from the blanket cylinders 101 and 102 to the web W in a high viscosity state, so that the dot gain stability due to the improvement of the ink viscosity can be improved and the ink bleeding can be prevented. The difference in printing accuracy due to the paper type can be suppressed.

  FIG. 10 is a schematic configuration diagram illustrating a rotary printing press including a printing apparatus according to an eighth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in Example 7 mentioned above, and the overlapping description is abbreviate | omitted.

  The offset rotary printing press of Example 8 is a rotary printing press using water-based ink, and as shown in FIG. 10, a paper feeding device 81, an infeed device 82, a printing device 83, and a drying device 84. , A cooling device 85, a web pass device 86, and a sheeter 89. That is, the offset rotary printing press of the eighth embodiment is provided with a sheeter 89 instead of the folding device 87 and the paper discharge device 88 in the offset rotary printing press of the seventh embodiment, and the other configurations are the same. In this case, the sheeter 89 cuts the web W by a predetermined length, stacks it, and discharges it.

  Note that the printing method using the rotary offset printing press according to the eighth embodiment is different only in the processing of the web W after printing by the sheeter 89, but the paper feeding device 81, the infeed device 82, the printing device 83, the drying device 84, and the cooling device. 85. Since the processing is the same by the web pass device 86, the description is omitted. Further, since the operational effects of the printing apparatus 83 (printing unit 95) are the same, this description is also omitted.

  In Examples 7 and 8 described above, the drying device 84 heats and dries the web W, so that the function of the second drying device (second lamps 107 and 108) is added to the drying device 84. The second lamps 107 and 108 may be eliminated by substituting. Moreover, in Examples 5-8 mentioned above, although the printing apparatus of this invention was comprised as a part or all of the printing apparatus in an offset sheet-fed printing machine or an offset rotary printing machine, it is not limited to the structure. It should be set as appropriate according to the printing form. Moreover, in each Example mentioned above, although comprised as a double-sided printing machine or a single-sided printing machine, any printing machine may be sufficient.

  In each of the above-described embodiments, the blanket cylinder is applied as the transfer body, and the impression cylinder is applied as the printing body and the conveyance body. However, the present invention is not limited to these configurations, and an endless belt is used instead of each cylinder. You may apply.

  In each of the above-described embodiments, the water-based ink is composed of pigments, ultraviolet curable resins, vehicle components, catalysts, additives, water-soluble solvents, and the like, and the water-soluble solvent is heated and evaporated by infrared rays from the first lamp. Although it was made to dry, it is not limited to this structure. For example, a thermosetting resin may be applied as a component of the water-based ink instead of the water-soluble solvent, and the thermosetting resin may be heat-cured by infrared rays from the first lamp and dried.

  An example of the composition of this ink is composed of water as a main component, a coloring component such as a pigment, and an auxiliary agent such as an organic component or glycerol. An example of the composition of the UV curable ink is composed of a photopolymerizable resin as a main component and a photopolymerization initiator, a colorant, an auxiliary agent, and the like. That is, the ink used in the present invention only needs to contain a component for drying or curing a thermal drying or thermosetting ink and a component for UV drying or UV curing. Further, only the moisture is dried by the first heat drying by the first heat drying, and the UV curing component remains uncured and has an appropriate adhesive force, and after adhering to the printing medium, the second ultraviolet irradiation device The ink is preferably adjusted so that it can be completely cured. The ink used in the present invention may be appropriately selected from known heat-drying or thermosetting inks and known UV-drying or UV-curable ink components so as to satisfy these functions.

An example of the ink composition is shown below. Here, “part” is based on mass.
(Preparation of pigment dispersion)
To 15 parts of pigment, add 15 parts of resin varnish, 69 parts of water and 1 part of triethylenediamine, and after thoroughly mixing with a mixer, use a bead mill to reduce the average particle size to 0.2 μm or less. Dispersed until Thereafter, coarse particles having an average particle diameter of 5 μm or more were removed by filtration to obtain a pigment dispersion. Pigment Yellow 74, Pigment Red 122, Pigment Blue 15: 3, and Pigment Black 7 were used as pigments. The resin varnish has a composition of 30 parts of JONCRYL 67 (manufactured by BASF. JONCRYL is a registered trademark), 10 parts of triethylenediamine, and 60 parts of water.
(Preparation of ink)
Using the above pigment dispersion, an inkjet ink was prepared according to a conventional method with the following composition. The polyethylene glycol diacrylate in the formulation is an ultraviolet curable compound, and the number of n is the number of glycol repeats. IRGACURE 2959 (manufactured by BASF. IRGACURE is a registered trademark. “IRGACURE 2959” is 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one). It is an agent. The ultraviolet curing initiator and triethylenediamine used as a pH adjuster were added after the other components were mixed in advance.
[Ink composition]
-Pigment dispersion 20 parts-JONCRYL 67 5 parts-Water 50 parts-Propylene glycol 20 parts-Triethylenediamine 0.5 parts-Polyethylene glycol diacrylate (n = 4) 5 parts-IRGACURE 2959 0.5 parts

  In each of the above-described embodiments, the print medium is the print sheet S as a sheet and the web W as a continuous paper. However, the print medium is not limited to the print paper, and may be a resin film, a steel sheet, or the like.

  In addition, the printing apparatus according to the present invention may transfer the ink to the print medium via the transfer body, or may spray the ink directly on the print medium.

  A printing apparatus, a printing method, a rotary printing machine, and a printing machine according to the present invention are provided with a first drying apparatus that irradiates ink with infrared rays and dries, and a second drying apparatus that irradiates ink with ultraviolet rays and dries. Thus, it is possible to improve the printing accuracy regardless of the type of printing medium, and it can be applied to any printing machine such as offset, gravure and flexo.

11, 41 Paper feeding device 12, 42 Conveying device 13, 43 Printing device 14, 44 Paper delivery device 31 Blanket cylinder (transfer body)
32 Impression cylinder (printed body, transport body)
34, 34a, 34b, 34c, 34d Inkjet head 35, 35a, 35b, 35c, 35d, 39, 40 First lamp (first drying device)
36, 36a, 36b, 36c, 36d Second lamp (second drying device)
37 Cleaning roller (cleaning device)
38 Preheating lamp (Preheating device)
61, 62, 63, 64, 65 Printing unit (printing device)
DESCRIPTION OF SYMBOLS 81 Paper feeder 82 In-feed device 83 Printing device 84 Drying device 85 Cooling device 86 Web pass device 87 Folding device 88 Paper discharge device 89 Sheeter 95 Printing unit (printing device)
101,102 Blanket cylinder (printing cylinder)
103, 104 Inkjet head 105, 106 First lamp (first drying device)
107, 108 Second lamp (second drying device)
S Print sheet (print medium)
W Web (print media)

Claims (10)

An ink jet head that forms an image by spraying ink containing a component that is thermally dried or thermally cured and a component that is UV dried or UV cured;
A first drying device for heat-drying or heat-curing the ink sprayed from the inkjet head;
A second drying device for irradiating the ink with ultraviolet rays to dry or cure ultraviolet rays;
A printing apparatus comprising:   The printing apparatus according to claim 1, wherein the second drying device irradiates the heat-dried or heat-cured ink with ultraviolet rays to perform ultraviolet drying or ultraviolet curing.   A rotatable printing body and a transfer body that can be synchronously moved in contact with the printing body and that can be conveyed while sandwiching the printing medium are provided, and the ink sprayed from the inkjet head is provided on the surface of the transfer body. The printing apparatus according to claim 1, wherein the printing apparatus is sprayed onto the printing apparatus.   The first drying device is disposed so as to face the outer peripheral surface of the transfer body, and heat-drys or heat-hardens the ink sprayed from the inkjet head onto the outer peripheral surface of the transfer body. Item 4. The printing apparatus according to Item 3. A carrier capable of holding and conveying a print medium;
An ink jet head that forms an image by spraying ink on the surface of the printing medium held by the carrier;
A first drying device for heat drying or heat curing the ink blown from the inkjet head;
A second drying device that irradiates the ink sprayed on the surface of the print medium with ultraviolet rays to dry or cure ultraviolet rays;
A printing apparatus comprising: An image is formed by spraying ink on the surface of the moving transfer member,
The ink sprayed on the transfer body is heat-dried or heat-cured,
Transferring the ink of the transfer body to the print medium when transporting the print medium sandwiched between the transfer body and the printing body moving synchronously;
Irradiating the ink transferred to the printing medium with ultraviolet rays to cause ultraviolet drying or ultraviolet curing;
A printing method characterized by the above. Ink is blown toward the surface of the print medium being conveyed,
The dried ink is heat-dried or heat-cured,
Irradiating the ink sprayed on the surface of the printing medium with ultraviolet rays to dry or cure ultraviolet rays;
A printing method characterized by the above. A paper feeding device that sucks and feeds the sheets stacked on the paper feeding table;
A printing apparatus that conveys a sheet fed from the sheet feeding device between an impression cylinder and a blanket cylinder and transfers an image formed on the blanket cylinder to the sheet, and performs printing;
A paper discharge device that stacks and discharges the sheets printed by the printing device on a paper discharge table;
In a sheet-fed printing press comprising:
The printing apparatus includes:
An ink jet head that forms an image by spraying ink on the surface of the blanket cylinder;
A first drying device for heat-drying or heat-curing the ink sprayed from the inkjet head;
A second drying device for irradiating the ink transferred from the blanket cylinder to the web with ultraviolet rays to dry or cure the ultraviolet rays;
A printing machine comprising: A paper feeding device for feeding a web from a web,
A printing apparatus that conveys the web fed from the paper feeding apparatus between the impression cylinder and the blanket cylinder and transfers the image formed on the blanket cylinder to the web to perform printing; and
A folding device that forms a signature by cutting and bending the web printed by the printing device;
A paper discharge device for discharging the signature formed by the folding device;
In a rotary printing press comprising:
The printing apparatus includes:
An ink jet head that forms an image by spraying ink on the surface of the blanket cylinder;
A first drying device for heat-drying or heat-curing the ink sprayed from the inkjet head;
A second drying device for irradiating the ink transferred from the blanket cylinder to the printing medium with ultraviolet rays to dry or cure ultraviolet rays;
A rotary printing press characterized by comprising: A paper feeder for supplying print media;
A plurality of printing apparatuses that convey the printing medium fed from the paper feeding apparatus between the impression cylinder and the blanket cylinder and transfer the image formed on the blanket cylinder to the printing medium to perform printing; and
A paper discharge device for discharging the print medium printed by the printing device;
In a printing press comprising:
The printing apparatus includes a first printing apparatus that performs printing using a printing plate and a second printing apparatus that performs printing using an inkjet head.
The second printing device includes a first drying device that heat-drys or heat-hardens the ink sprayed from the inkjet head onto the surface of the blanket cylinder;
A second drying device for irradiating the ink transferred from the blanket cylinder to the printing medium with ultraviolet rays to dry or cure ultraviolet rays;
A printing machine comprising:

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