WO2014083722A1 - Printing method using offset printer - Google Patents

Printing method using offset printer Download PDF

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Publication number
WO2014083722A1
WO2014083722A1 PCT/JP2013/004440 JP2013004440W WO2014083722A1 WO 2014083722 A1 WO2014083722 A1 WO 2014083722A1 JP 2013004440 W JP2013004440 W JP 2013004440W WO 2014083722 A1 WO2014083722 A1 WO 2014083722A1
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WO
WIPO (PCT)
Prior art keywords
printing
ink
offset printing
curable ink
printing method
Prior art date
Application number
PCT/JP2013/004440
Other languages
French (fr)
Japanese (ja)
Inventor
真吾 河合
Original Assignee
大和グランド株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大和グランド株式会社 filed Critical 大和グランド株式会社
Priority to EP13830076.9A priority Critical patent/EP2927010B1/en
Priority to JP2013553178A priority patent/JP5824073B2/en
Publication of WO2014083722A1 publication Critical patent/WO2014083722A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing
    • B41M1/08—Dry printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/005—Ink viscosity control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/04—Rotary lithographic machines for offset printing using printing units incorporating one forme cylinder, one transfer cylinder, and one impression cylinder, e.g. for printing on webs
    • B41F7/06—Rotary lithographic machines for offset printing using printing units incorporating one forme cylinder, one transfer cylinder, and one impression cylinder, e.g. for printing on webs for printing on sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/20—Lithography
    • B41P2200/21—Dry offset printing

Definitions

  • the present invention relates to a printing method using an offset printing press, and more particularly, to a printing method using an offset printing press that is excellent in image formability.
  • Offset printing is known as one of printing techniques. Such offset printing employs a method in which ink attached to a plate is transferred to an intermediate transfer member such as a blanket and then printed on a substrate such as paper.
  • a reverse printed material in which a printing layer by offset printing is provided on a substrate having transparency, and a white ink is applied on the printing layer using a coater (for example, Patent Document) 2).
  • a printing layer by offset printing is provided on a substrate having transparency, and a white ink is applied on the printing layer using a coater (for example, Patent Document) 2).
  • Such printed matter is offset printed on a corona discharge treated polypropylene sheet using an ultraviolet curable ink, and UV cured at a printing speed of 6500 sheets / hour (about 30 m / minute).
  • the formability of the image is not sufficient. That is, the transferability of the ink from the waterless plate to the blanket and the transferability of the ink from the blanket to the printing medium are not necessarily sufficient.
  • the ink suitable for offset printing with a waterless plate which solves such a problem, and a to-be-printed body have not been developed yet.
  • the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a printing method using an offset printing press which is excellent in image formability.
  • the inventor of the present invention has made earnest studies to solve the above problems, and by making the printing speed of offset printing actively lower than a general speed and making the film thickness of the UV curable ink a constant film thickness. Surprisingly, it has been found that the above problems can be solved, and the present invention has been completed.
  • a plurality of transport rolls for transporting a printing material a blanket adjacent to the transport rolls, a waterless plate adjacent to the blanket, and a group of ink transport rolls adjacent to the waterless plate.
  • a printing method using an offset printing press having a UV irradiator for irradiating the printed substrate with UV, after transferring the UV curable ink applied to the waterless plate to a blanket The printing method has an offset printing step of printing on a substrate and a UV irradiation step of irradiating the printed substrate with UV to cure the UV curable ink, and the traveling speed of the substrate is 1700 m.
  • the printing method using an offset printing press which has a film thickness of 3 to 7 .mu.m or less, which is not more than 1 hour, is applied.
  • the present invention resides in (2) a printing method using the offset printing press as described in (1) 1 above, wherein the traveling speed of the printing medium is from 250 m / hour to 1700 m / hour.
  • the present invention resides in (3) the printing method using the offset printing press described in the above (1) or (2), wherein the substrate is a non-water absorbing synthetic paper, a plastic film or a paper board.
  • the ink conveyance roll group includes a temperature adjustment ink conveyance roll for adjusting the temperature of the UV curable ink, and the hot water is circulated in the core portion of the temperature adjustment ink conveyance roll.
  • the temperature of the UV curable ink is adjusted to 20 ° C. to 50 ° C. by the temperature adjustment ink transport roll, and the viscosity of the UV curable ink is 5 Pa ⁇ s to 1500 Pa.
  • a U-shaped guide is provided below the transport roll so as to conform to the shape of the transport roll, according to any one of the above (1) to (5) It belongs to a printing method using an offset printing press.
  • the present invention resides in (7) the printing method using the offset printing press according to the above (6), wherein the air is blown between the transport roll and the guide so that the printing material does not drip downward. .
  • the present invention resides in (8) a printing method using the offset printing press according to any one of the above (1) to (7), which is subjected to post-processing after offset printing and UV irradiation. .
  • the present invention resides in (9) a printing method using the offset printing press according to the above (8), wherein the post-processing is silk screen printing.
  • the transfer speed of the UV curable ink from the waterless plate to the blanket can be reduced by setting the printing speed of the offset printing to a predetermined range. Transferability of the UV curable ink to the print can be improved. For example, since the printing speed is slow, the density of the UV curable ink can be increased, and the transfer amount can also be increased. Thereby, the film thickness of the UV curable ink can also be 3 to 7 ⁇ m. In addition, since the film thickness can be 3 to 7 ⁇ m, not only the decorative property can be improved, but various functional inks can be used to sufficiently exhibit the function. Furthermore, since the printing speed is slow, UV irradiation can be performed sufficiently, and the curing strength of the UV curable ink can be raised to a level that can sufficiently withstand post-processing.
  • the waterless plate since the waterless plate is used, it is possible to prevent the dispersion of the image quality due to the watering amount and the emulsification of the water and the UV curable ink. In addition, since the waterless plate is used, the influence of static electricity in the image area (portion to be printed) can be minimized. As a result, automatic feeding and conveyance can be performed without problems even for materials such as molding materials that are not subjected to static electricity prevention.
  • the image forming property is improved by setting the printing speed within the above range. It is possible to improve, and by using the UV curable ink, it is possible to perform offset printing at a speed that does not burden the post-processing speed.
  • the ink transport roll group is provided with a temperature control ink transport roll for controlling the temperature of the UV curable ink, and the core portion of the temperature control ink transport roll is warm water Because it is in circulation, the applied UV curable ink can be heated or cooled to adjust its temperature.
  • the temperature at the time of use of the UV curable ink is 20 ° C. to 50 ° C., and to set the viscosity at the time of use of the UV curable ink to 5 Pa ⁇ s to 1500 Pa ⁇ s.
  • a U-shaped guide is provided below the transport roll so as to conform to the shape of the transport roll, so a part of the printing medium is below It is possible to prevent such a situation that the printed matter is wrinkled or the like between the transport rolls.
  • the printing speed of offset printing is high, since a to-be-printed body winds around a conveyance roll by the momentum of rotation of a conveyance roll, such a situation does not occur. At this time, when air is blown between the transport roll and the guide, the printed material can be further prevented from dropping downward.
  • FIG. 1 is a schematic view showing an offset printing press used in a printing method according to the present embodiment.
  • FIG. 2 is a flowchart showing a printing method using the offset printing press according to the present embodiment.
  • FIG. 1 is a schematic view showing an offset printing press used in a printing method according to the present embodiment.
  • the offset printing press 10 includes a plurality of transport rolls 6 for transporting the printing medium 8, a blanket 3 adjacent to the transport rolls 6, a waterless plate 2 adjacent to the blanket 3, and no water.
  • An ink transport roll group 1 adjacent to the printing plate 2 and a UV irradiator 5 for irradiating the printed substrate 8 with UV are included.
  • the ink transport roll group 1 is an assembly of inking rolls or anilox rolls.
  • only an inking roll may be collected, only an anilox roll may be collected, or both may be mixed and collected.
  • the printing medium 8 is conveyed by rotating the conveying rolls 6 adjacent to each other in the direction indicated by the arrow while holding the printing medium 8 therebetween.
  • the blanket 3, the waterless plate 2 and the ink transport roll constituting the ink transport roll group 1 and the temperature control ink transport roll described later are all cylindrical and correspond to the rotational direction of the transport roll 6. Each is rotated in a different direction or in the same direction. At the time of rotation, transfer of the UV curable ink is performed.
  • the ink transport roll group 1 includes the plurality of ink transport rolls and the temperature control ink transport roll 1a disposed between the ink transport rolls.
  • the temperature control ink transport roll 1a has a core-sheath structure in which the core portion is hollow, and hot water flows through the core portion. Thereby, the temperature of the UV curable ink is adjusted.
  • the ink transport roll is an inking roll or an anilox roll
  • the temperature control ink transport roll is an inking roll or an anilox roll having a core-sheath structure.
  • a U-shaped guide 4 is provided below the transport roll 6 so as to follow the shape of the transport roll 6. For this reason, it is possible to prevent a situation in which a part of the printing medium 8 hangs downward, and the printing medium 8 is folded between the transport rolls 6 and rolled up, and the printing medium 8 is wrinkled. Further, air is blown between the transport roll 6 and the guide 4 by an air blower or the like (not shown) so that the printing medium 8 does not hang downward. For this reason, it is possible to further prevent the printing medium from hanging down.
  • the to-be-printed body 8 is a non-water absorbing synthetic paper, a plastic film, or a paper board.
  • the product (printed material) can be reduced in weight and durability can be imparted.
  • the plastic film is not particularly limited.
  • Polystyrene film, polyacrylonitrile film, ethylene vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, ethylene-methacrylic acid copolymer film, cellulose triacetate film, ionomer film, cellophane etc. are used.
  • the UV curable ink is applied from the ink transport roll group 1 to the waterless plate 2 and is printed on the printing material 8 through the waterless plate 2 and the blanket 3. .
  • the details of these will be described later.
  • a UV curable ink is used. Since a UV curable ink is used, it is possible to immediately start post-processing by irradiating UV, and lead to shortening of delivery time. At this time, as described above, since the waterless plate 2 is used as the plate, it is preferable that the UV curable ink be lipophilic. By making it lipophilic, there is an advantage that the lipophilic portion to be a handle of the waterless version 2 is well blended.
  • the UV curable ink contains a UV curable resin, a polymerization initiator, and a pigment.
  • additives such as a solvent, a sensitizer, a polymerization inhibitor, an antifoaming agent, and a surfactant may be further included.
  • the UV curable resin include acrylate-based, methacrylate-based and unsaturated polyester-based resins having a polymerizable ethylenic double bond. More specifically, polyester acrylate, epoxy acrylate, urethane acrylate and the like can be mentioned.
  • the polymerization initiator include benzophenones, benzoins, acetophenones, and thioxanthones.
  • the UV curable ink can also contain a functional ink.
  • a functional ink a conductive ink, an insulating ink, a temperature-sensitive ink, a hydrophilic water coloring ink, a perfume ink, an ultraviolet coloring ink, a fluorescent ink, a luminous ink, etc. may be mentioned. All of these functions are exhibited by leveling with a thick film. By the way, if you do not get a certain amount of dryness, that function will not be exhibited. Therefore, when functional ink is used, not only the decorativeness can be improved, but also its function can be fully exhibited.
  • the temperature at which the UV curable ink is used is preferably 20 ° C. to 50 ° C. In addition, this temperature is adjusted by the temperature control ink conveyance roll 1a mentioned above.
  • the viscosity at the time of use of the UV curable ink is preferably 5 Pa ⁇ s to 1500 Pa ⁇ s.
  • the physical properties of the UV curable ink are within the above range, transfer of the UV curable ink to the waterless plate 2, transfer of the UV curable ink to the blanket 3, and UV to the printing material 8 Transfer of the curable ink can be performed reliably and stably.
  • the UV irradiator 5 is a device for irradiating the printed substrate 8 with UV.
  • the UV irradiator 5 is not particularly limited, and a commercially available one can be used as appropriate.
  • the UV irradiator 5 may be installed inside the offset printing press 10, for example, between cylinders, or may be installed outside.
  • FIG. 2 is a flowchart showing a printing method using the offset printing press according to the present embodiment.
  • the UV curable ink applied to the waterless plate 2 is transferred to the blanket 3 by the ink transport roll group 1, and then the printing material 8 is printed.
  • an UV irradiation step S2 in which the printed substrate 8 is irradiated with UV to cure the UV curable ink.
  • the offset printing step S1 and the UV irradiation step S2 are continuously performed.
  • the UV curable ink is applied to the waterless plate 2 by the ink transport roll group 1.
  • the ink transport roll group 1 since the ink transport roll group 1 is used, when applying the UV curable ink to the waterless plate 2, even if the printing speed is low, a constant amount The ink can be supplied stably.
  • mist is generated, but generation of mist can be prevented by using the ink transport roll group.
  • the waterless plate since the waterless plate is used, it is possible to prevent the dispersion of the image quality due to the amount of watering and the emulsification of the water and the UV curable ink. In addition to this, the influence of static electricity in the image area (the part to be printed) can be reduced.
  • the traveling speed of the printing medium 8 is low.
  • the traveling speed of the printing medium 8 and the printing speed of the printing medium 8 are the same so as to correspond to each other. Therefore, by setting the traveling speed of the printing medium 8 low, the printing speed on the printing medium 8 becomes slow.
  • the traveling speed of the printing medium 8 is 1700 m / hour or less, preferably 250 m / hour to 1700 m / hour, and more preferably 250 m / hour to 1500 m / hour.
  • Transferability of the UV curable ink from the waterless plate 2 to the blanket 3 and transfer of the UV curable ink from the blanket 3 to the substrate 8 by setting the traveling speed of the substrate 8 to 1700 m / hour or less Can be improved.
  • the printing speed in the common offset printing machine marketed is 3000 m / hour at the minimum.
  • the concentration of the UV curable ink can be increased, and the transfer amount can also be increased.
  • the film thickness can be increased.
  • the film thickness of the UV curable ink applied is 3 to 7 ⁇ m.
  • the film thickness of the UV curable ink in a general offset printing press is 1 to 2 ⁇ m.
  • the film thickness can be 3 to 7 ⁇ m, it is possible not only to improve the decorativeness but also to fully exhibit the function using various functional inks.
  • UV irradiation can be performed sufficiently, and the curing strength of the UV curable ink can be raised to a level that can sufficiently withstand post-processing.
  • the printed material 8 is made of non-water absorbent synthetic paper, plastic film or plastic plate, and the printing speed is in the above range to form an image. It is possible to improve the properties, and as described above, by using the UV curable ink, it is possible to perform offset printing at a speed at which the post-processing speed is not a burden.
  • the water-absorbent printed material when the printing speed is slow, the water-absorbent synthetic paper absorbs the moisture in the air, and when the UV-curable ink is applied, the UV-curable ink bleeds. There is.
  • the printed substrate 8 is irradiated with UV to cure the UV curable ink.
  • the UV irradiation method is not particularly limited, and may be performed by a conventionally known method.
  • the offset printing press 10 it is preferable to apply post-processing after the offset printing step S1 and the UV irradiation step S2 have been successively performed. That is, after offset printing and UV irradiation, post-processing is preferably performed. In this case, a print having excellent decorativeness can be obtained.
  • post-processing examples include silk screen printing, flexographic printing, roller coating, painting, molding and the like.
  • post-processing is preferably silk screen printing.
  • a print having excellent decorativeness can be obtained.
  • offset printing offset printing step S1 and UV irradiation step S2
  • silk screen printing can be performed successively.
  • the present invention is used as a printing method using an offset printing press for applying a UV curable ink to a substrate. According to the printing method using the offset printing press of the present invention, a print having excellent formability of an image can be obtained.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

[Problem] To provide a printing method using an offset printer with which image formability is excellent. [Solution] The present invention is a printing method using an offset printer (10) having: multiple conveyor rolls (6) for conveying a printing object (8); blankets (3) adjacent to the conveyor rolls (6); waterless plates (2) adjacent to the blankets (3); ink conveyor roll groups (1) adjacent to the waterless plates (2); and a UV irradiator (5) for irradiating UV on the printed printing object (8). The printing method: comprises an offset printing process (S1) for printing a UV-curable ink applied on a waterless plate (2), after transfer to a blanket (3), on the printing object (8), and a UV irradiation process (S2) for irradiating UV on the printed printing object (8) to cure the UV-curable ink; and uses an offset printer (10) in which the running speed of the printing object (8) is 1700 m/hour or less and the film thickness of the applied UV-curable ink is 3-7 µm.

Description

オフセット印刷機を用いた印刷方法Printing method using offset printing press
　本発明は、オフセット印刷機を用いた印刷方法に関し、更に詳しくは、画像の成型性に優れるオフセット印刷機を用いた印刷方法に関する。 The present invention relates to a printing method using an offset printing press, and more particularly, to a printing method using an offset printing press that is excellent in image formability.
　印刷技術の一つとして、オフセット印刷が知られている。
　かかるオフセット印刷は、版に付けられたインキを、ブランケット等の中間転写体に転写した後、紙等の被印刷体に印刷する方式をとっている。 Offset printing is known as one of printing techniques.
Such offset printing employs a method in which ink attached to a plate is transferred to an intermediate transfer member such as a blanket and then printed on a substrate such as paper.
　従来から、オフセット印刷の分野においては、納期の短縮、コストダウンの観点から、オフセット印刷機を高速運転させる方法が検討されている。
　例えば、版胴外周に装備された刷版及びブランケット胴外周に装備されたブランケットを介して、走行する印刷基材の印刷面に紫外線を照射することにより硬化する速乾インキを用いて印刷するオフセット印刷機が知られている（例えば、特許文献１参照）。
　該オフセット印刷機においては、速乾インキを用いることにより、高速運転が可能となっている。 Heretofore, in the field of offset printing, a method of operating an offset printing press at high speed has been studied from the viewpoint of shortening delivery time and cost.
For example, offset printing using a quick-drying ink that is cured by irradiating the printing surface of a running printing substrate with ultraviolet light through a printing plate mounted on the periphery of a printing cylinder and a blanket mounted on the outer periphery of a blanket cylinder A printing press is known (see, for example, Patent Document 1).
In the offset printing press, high-speed operation is possible by using fast-drying ink.
　一方で、透明性を有する基材上にオフセット印刷による印刷層が設けられ、該印刷層の上にコーターを用いて白インキが塗工された裏刷り印刷物が開示されている（例えば、特許文献２参照）。
　かかる印刷物においては、コロナ放電処理したポリプロピレンシート上に紫外線硬化型インキを用いてオフセット印刷し、印刷速度６５００枚／時（約３０ｍ／分）にてＵＶ硬化させている。 On the other hand, there is disclosed a reverse printed material in which a printing layer by offset printing is provided on a substrate having transparency, and a white ink is applied on the printing layer using a coater (for example, Patent Document) 2).
Such printed matter is offset printed on a corona discharge treated polypropylene sheet using an ultraviolet curable ink, and UV cured at a printing speed of 6500 sheets / hour (about 30 m / minute).
　ところで、オフセット印刷においては、一般に、水を使う水あり版での印刷が行われている。
　水あり版での印刷には、インクの盛り量や柄のエッジ等の管理を、インクの供給だけでなく、版への水付け量でも行うことが可能である。 By the way, in offset printing, printing is generally performed with a water plate using water.
In the printing with a water plate, it is possible to manage not only the supply of the ink but also the amount of water applied to the plate, such as the amount of ink buildup and the edge of the pattern.
　ところが、かかる水付け量は、空気中の湿度や温度等により左右されるので、画質が安定しないという欠点がある。
　また、水とインクとの境界では互いに乳化が進行するので、この乳化した部分が残存すると、品質が悪くなるという欠点がある。この場合、オフセット印刷後にフィルムや板を別途後加工したり、後加工後樹脂入れしたりすることも困難となる。 However, since the amount of watering depends on the humidity, temperature, etc. in the air, there is a disadvantage that the image quality is not stable.
Further, since emulsification proceeds with each other at the boundary between water and ink, there is a disadvantage that the quality is deteriorated if the emulsified portion remains. In this case, it is also difficult to post-process the film or plate separately after offset printing, or to insert a resin after post-processing.
　これに対し、近年、オフセット印刷においては、柄が親油性で、非画線部（印刷されない部分）はシリコン層が形成された構造の水無し版が開発されている。
　水無し版での印刷においては、水を用いないため、水付け量による画質のばらつきや水とインクとによる乳化の問題は解決される。 On the other hand, in recent years, in offset printing, a waterless plate having a structure in which a handle is oleophilic and a non-image portion (a portion not to be printed) is formed with a silicon layer has been developed.
In printing without a water plate, since water is not used, the problems of image quality variation due to the amount of water applied and the problem of emulsification with water and ink are solved.
特開２００９－２７４４３２号公報JP, 2009-274432, A 特開２００７－２９６８３０号公報JP 2007-296830 A
　しかしながら、水無し版での印刷においては、画像の成型性が十分とはいえない。すなわち、水無し版からブランケットへのインクの転移性、ブランケットから被印刷体へのインクの転移性が必ずしも十分とはいえない。
　なお、かかる問題を解決する水無し版でのオフセット印刷に適したインク、被印刷体は未だ開発されていない。 However, in waterless printing, the formability of the image is not sufficient. That is, the transferability of the ink from the waterless plate to the blanket and the transferability of the ink from the blanket to the printing medium are not necessarily sufficient.
In addition, the ink suitable for offset printing with a waterless plate which solves such a problem, and a to-be-printed body have not been developed yet.
　本発明は上記事情に鑑みてなされたものであり、画像の成型性に優れるオフセット印刷機を用いた印刷方法を提供することを目的とする。 The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a printing method using an offset printing press which is excellent in image formability.
　本発明者は、上記課題を解決するため鋭意検討したところ、オフセット印刷の印刷速度を一般的な速度よりも積極的に遅くし、ＵＶ硬化型インクの膜厚を一定の膜厚とすることで、意外にも、上記課題を解決し得ることを見出し、本発明を完成するに至った。 The inventor of the present invention has made earnest studies to solve the above problems, and by making the printing speed of offset printing actively lower than a general speed and making the film thickness of the UV curable ink a constant film thickness. Surprisingly, it has been found that the above problems can be solved, and the present invention has been completed.
　本発明は、（１）被印刷体を搬送する複数の搬送ロールと、該搬送ロールに隣接するブランケットと、該ブランケットに隣接する水無し版と、該水無し版に隣接するインク搬送ロール群と、印刷された被印刷体にＵＶを照射するＵＶ照射機と、を有するオフセット印刷機を用いた印刷方法であって、水無し版に付与されたＵＶ硬化型インクを、ブランケットに転写した後、被印刷体に印刷するオフセット印刷工程と、印刷された被印刷体に、ＵＶを照射して、ＵＶ硬化型インクを硬化するＵＶ照射工程と、を有し、被印刷体の走行速度が、１７００ｍ／時以下であり、付与されるＵＶ硬化型インクの膜厚が３～７μｍであるオフセット印刷機を用いた印刷方法に存する。 According to the present invention, there are provided (1) a plurality of transport rolls for transporting a printing material, a blanket adjacent to the transport rolls, a waterless plate adjacent to the blanket, and a group of ink transport rolls adjacent to the waterless plate. A printing method using an offset printing press having a UV irradiator for irradiating the printed substrate with UV, after transferring the UV curable ink applied to the waterless plate to a blanket, The printing method has an offset printing step of printing on a substrate and a UV irradiation step of irradiating the printed substrate with UV to cure the UV curable ink, and the traveling speed of the substrate is 1700 m. The printing method using an offset printing press which has a film thickness of 3 to 7 .mu.m or less, which is not more than 1 hour, is applied.
　本発明は、（２）被印刷体の走行速度が、２５０ｍ／時～１７００ｍ／時である上記（１）１記載のオフセット印刷機を用いた印刷方法に存する。 The present invention resides in (2) a printing method using the offset printing press as described in (1) 1 above, wherein the traveling speed of the printing medium is from 250 m / hour to 1700 m / hour.
　本発明は、（３）被印刷体が、非吸水性の合成紙、プラスチックフィルム又は板紙である上記（１）又は（２）に記載のオフセット印刷機を用いた印刷方法に存する。 The present invention resides in (3) the printing method using the offset printing press described in the above (1) or (2), wherein the substrate is a non-water absorbing synthetic paper, a plastic film or a paper board.
　本発明は、（４）インク搬送ロール群が、ＵＶ硬化型インクの温度を調整するための温度調整インク搬送ロールを備え、該温度調整インク搬送ロールの芯部に温水が流通するようになっている上記（１）～（３）のいずれか１つに記載のオフセット印刷機を用いた印刷方法に存する。 In the present invention, (4) the ink conveyance roll group includes a temperature adjustment ink conveyance roll for adjusting the temperature of the UV curable ink, and the hot water is circulated in the core portion of the temperature adjustment ink conveyance roll. The printing method using the offset printing press according to any one of the above (1) to (3).
　本発明は、（５）温度調整インク搬送ロールにより、ＵＶ硬化型インクの使用時の温度を２０℃～５０℃に調整し、且つ、ＵＶ硬化型インクの使用時の粘度を５Ｐａ・ｓ～１５００Ｐａ・ｓとする上記（４）記載のオフセット印刷機を用いた印刷方法に存する。 In the present invention, (5) the temperature of the UV curable ink is adjusted to 20 ° C. to 50 ° C. by the temperature adjustment ink transport roll, and the viscosity of the UV curable ink is 5 Pa · s to 1500 Pa. The printing method using the offset printing press according to (4) above, wherein s is used.
　本発明は、（６）搬送ロールの下方には、該搬送ロールの形状に沿うように、Ｕ字状のガイドが設けられている上記（１）～（５）のいずれか１つに記載のオフセット印刷機を用いた印刷方法に存する。 According to the present invention, (6) a U-shaped guide is provided below the transport roll so as to conform to the shape of the transport roll, according to any one of the above (1) to (5) It belongs to a printing method using an offset printing press.
　本発明は、（７）搬送ロールとガイドとの間には、被印刷体が下方に垂れないようにエアーが吹付けられている上記（６）記載のオフセット印刷機を用いた印刷方法に存する。 The present invention resides in (7) the printing method using the offset printing press according to the above (6), wherein the air is blown between the transport roll and the guide so that the printing material does not drip downward. .
　本発明は、（８）オフセット印刷し、ＵＶ照射を施した後、後加工が施される上記（１）～（７）のいずれか１つに記載のオフセット印刷機を用いた印刷方法に存する。 The present invention resides in (8) a printing method using the offset printing press according to any one of the above (1) to (7), which is subjected to post-processing after offset printing and UV irradiation. .
　本発明は、（９）後加工がシルクスクリーン印刷である上記（８）記載のオフセット印刷機を用いた印刷方法に存する。 The present invention resides in (9) a printing method using the offset printing press according to the above (8), wherein the post-processing is silk screen printing.
　本発明のオフセット印刷機を用いた印刷方法においては、オフセット印刷の印刷速度を遅くし、所定の範囲内とすることによって、水無し版からブランケットへのＵＶ硬化型インクの転移性、ブランケットから被印刷体へのＵＶ硬化型インクの転移性を向上させることができる。
　例えば、印刷速度が遅いので、ＵＶ硬化型インクの濃度を上げることができ、転移量も増加させることができる。これにより、ＵＶ硬化型インクの膜厚も３～７μｍにすることができる。
　また、膜厚を３～７μｍにすることができることから、装飾性の向上だけでなく、各種の機能性インキを用いて、その機能を十分に発揮することができる。
　さらに、印刷速度が遅いので、ＵＶ照射を十分に行うことができ、ＵＶ硬化型インクの硬化強度を後加工に十分に耐え得るレベルに上げることができる。 In the printing method using the offset printing press of the present invention, the transfer speed of the UV curable ink from the waterless plate to the blanket can be reduced by setting the printing speed of the offset printing to a predetermined range. Transferability of the UV curable ink to the print can be improved.
For example, since the printing speed is slow, the density of the UV curable ink can be increased, and the transfer amount can also be increased. Thereby, the film thickness of the UV curable ink can also be 3 to 7 μm.
In addition, since the film thickness can be 3 to 7 μm, not only the decorative property can be improved, but various functional inks can be used to sufficiently exhibit the function.
Furthermore, since the printing speed is slow, UV irradiation can be performed sufficiently, and the curing strength of the UV curable ink can be raised to a level that can sufficiently withstand post-processing.
　本発明のオフセット印刷機を用いた印刷方法においては、水無し版を用いているので、水付け量による画質のばらつきや水とＵＶ硬化型インクとによる乳化を防止できる。
　また、水無し版を用いているので、画線部（印刷される部分）における静電気の影響を極力少なくすることができる。これにより、成型用材料等、静電防止がされてない材料に対しても自動給紙、搬送を問題無く行うことができる。 In the printing method using the offset printing press of the present invention, since the waterless plate is used, it is possible to prevent the dispersion of the image quality due to the watering amount and the emulsification of the water and the UV curable ink.
In addition, since the waterless plate is used, the influence of static electricity in the image area (portion to be printed) can be minimized. As a result, automatic feeding and conveyance can be performed without problems even for materials such as molding materials that are not subjected to static electricity prevention.
　本発明のオフセット印刷機を用いた印刷方法においては、ＵＶ硬化型インクを用いるので、ＵＶを照射することにより、直ぐに後加工に取りかかることが可能であり、納期短縮にも繋がる。
　これらのことから、本発明のオフセット印刷機を用いた印刷方法によれば、画像の成型性に優れる印刷体が得られる。 In the printing method using the offset printing press of the present invention, since UV curable ink is used, it is possible to immediately start post-processing by irradiating UV, which leads to shortening of delivery time.
From these facts, according to the printing method using the offset printing press of the present invention, a printed body having excellent image formability can be obtained.
　本発明のオフセット印刷機を用いた印刷方法においては、被印刷体が、非吸水性の合成紙、プラスチックフィルム又は板紙である場合、印刷速度を上記範囲内とすることで、画像の成型性を向上させることができ、且つＵＶ硬化型インクを用いることで、後加工の速度に負担にならない速度でオフセット印刷を行うことが可能となる。 In the printing method using the offset printing press of the present invention, when the printing material is a non-water absorbent synthetic paper, a plastic film or a paper board, the image forming property is improved by setting the printing speed within the above range. It is possible to improve, and by using the UV curable ink, it is possible to perform offset printing at a speed that does not burden the post-processing speed.
　本発明のオフセット印刷機を用いた印刷方法においては、インク搬送ロール群が、ＵＶ硬化型インクの温度を調整するための温度調整インク搬送ロールを備え、該温度調整インク搬送ロールの芯部に温水が流通するようになっているので、付与されるＵＶ硬化型インクに対して、加熱又は冷却し、その温度を調整することができる。なお、オフセット印刷の印刷速度が速い場合は、摩擦による熱により、ＵＶ硬化型インクが加熱され、転写され易くなるが、本発明のようにオフセット印刷の印刷速度が遅い場合は、ＵＶ硬化型インクが加熱されないので、転写されにくい。そのため、加熱する必要がある。
　このとき、ＵＶ硬化型インクの使用時の温度を２０℃～５０℃に調整し、且つ、ＵＶ硬化型インクの使用時の粘度を５Ｐａ・ｓ～１５００Ｐａ・ｓとすることが好ましい。 In the printing method using the offset printing press of the present invention, the ink transport roll group is provided with a temperature control ink transport roll for controlling the temperature of the UV curable ink, and the core portion of the temperature control ink transport roll is warm water Because it is in circulation, the applied UV curable ink can be heated or cooled to adjust its temperature. In addition, when the printing speed of offset printing is fast, the UV curing ink is heated and easily transferred by heat due to friction, but when the printing speed of offset printing is slow as in the present invention, the UV curing ink Is difficult to transfer because it is not heated. Therefore, it is necessary to heat it.
At this time, it is preferable to adjust the temperature at the time of use of the UV curable ink to 20 ° C. to 50 ° C., and to set the viscosity at the time of use of the UV curable ink to 5 Pa · s to 1500 Pa · s.
　本発明のオフセット印刷機を用いた印刷方法においては、搬送ロールの下方に、該搬送ロールの形状に沿うように、Ｕ字状のガイドが設けられているので、被印刷体の一部が下方に垂れ、搬送ロール間で被印刷体に皺ができる等の事態を防止することができる。なお、オフセット印刷の印刷速度が速い場合は、搬送ロールの回転の勢いにより、被印刷体が搬送ロールに巻き付くので、このような事態は生じない。
　このとき、搬送ロールとガイドとの間に、エアーを吹付けると、被印刷体が下方に垂れることをより防止できる。 In the printing method using the offset printing press of the present invention, a U-shaped guide is provided below the transport roll so as to conform to the shape of the transport roll, so a part of the printing medium is below It is possible to prevent such a situation that the printed matter is wrinkled or the like between the transport rolls. In addition, when the printing speed of offset printing is high, since a to-be-printed body winds around a conveyance roll by the momentum of rotation of a conveyance roll, such a situation does not occur.
At this time, when air is blown between the transport roll and the guide, the printed material can be further prevented from dropping downward.
　本発明のオフセット印刷機を用いた印刷方法においては、オフセット印刷し、ＵＶ照射を施した後、後加工が施される場合、装飾性に優れる印刷体を得ることができる。このとき、後加工がシルクスクリーン印刷である場合、オフセット印刷とシルクスクリーン印刷との印刷速度を一致させることができるので、オフセット印刷とシルクスクリーン印刷とを連続して施すことができる。 In the printing method using the offset printing press of the present invention, when post-processing is performed after offset printing and UV irradiation, a print having excellent decorativeness can be obtained. At this time, when the post-processing is silk screen printing, the printing speeds of offset printing and silk screen printing can be made to coincide with each other, so that offset printing and silk screen printing can be applied continuously.
図１は、本実施形態に係る印刷方法に用いられるオフセット印刷機を示す概略図である。FIG. 1 is a schematic view showing an offset printing press used in a printing method according to the present embodiment. 図２は、本実施形態に係るオフセット印刷機を用いた印刷方法を示すフローチャートである。FIG. 2 is a flowchart showing a printing method using the offset printing press according to the present embodiment.
　以下、必要に応じて図面を参照しつつ、本発明の好適な実施形態について詳細に説明する。なお、図面中、同一要素には同一符号を付すこととし、重複する説明は省略する。また、上下左右等の位置関係は、特に断らない限り、図面に示す位置関係に基づくものとする。更に、図面の寸法比率は図示の比率に限られるものではない。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as needed. In the drawings, the same elements will be denoted by the same reference signs and redundant description will be omitted. Further, the positional relationship such as upper, lower, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratio in the drawings is not limited to the illustrated ratio.
　図１は、本実施形態に係る印刷方法に用いられるオフセット印刷機を示す概略図である。
　図１に示すように、オフセット印刷機１０は、被印刷体８を搬送する複数の搬送ロール６と、搬送ロール６に隣接するブランケット３と、ブランケット３に隣接する水無し版２と、水無し版２に隣接するインク搬送ロール群１と、印刷された被印刷体８にＵＶを照射するＵＶ照射機５と、を有する。
　ここで、インク搬送ロール群１とは、インキングロール又はアニロックスロールの集合体である。なお、インキングロールのみが集合したものであってもよく、アニロックスロールのみが集合したものであってもよく、両方が混合して集合したものであってもよい。 FIG. 1 is a schematic view showing an offset printing press used in a printing method according to the present embodiment.
As shown in FIG. 1, the offset printing press 10 includes a plurality of transport rolls 6 for transporting the printing medium 8, a blanket 3 adjacent to the transport rolls 6, a waterless plate 2 adjacent to the blanket 3, and no water. An ink transport roll group 1 adjacent to the printing plate 2 and a UV irradiator 5 for irradiating the printed substrate 8 with UV are included.
Here, the ink transport roll group 1 is an assembly of inking rolls or anilox rolls. In addition, only an inking roll may be collected, only an anilox roll may be collected, or both may be mixed and collected.
　オフセット印刷機１０においては、隣接する搬送ロール６同士が、それらの間に被印刷体８を挟持した状態で矢印に示す方向に回転することにより、被印刷体８が搬送されるようになっている。
　また、ブランケット３、水無し版２及びインク搬送ロール群１を構成するインク搬送ロール、及び、後述する温度調整インク搬送ロールは、いずれも円筒状であり、搬送ロール６の回転方向に対応してそれぞれ異方向又は同方向に回転するようになっている。
　そして、回転時には、ＵＶ硬化型インクの転移が行われるようになっている。 In the offset printing press 10, the printing medium 8 is conveyed by rotating the conveying rolls 6 adjacent to each other in the direction indicated by the arrow while holding the printing medium 8 therebetween. There is.
The blanket 3, the waterless plate 2 and the ink transport roll constituting the ink transport roll group 1 and the temperature control ink transport roll described later are all cylindrical and correspond to the rotational direction of the transport roll 6. Each is rotated in a different direction or in the same direction.
At the time of rotation, transfer of the UV curable ink is performed.
　オフセット印刷機１０において、インク搬送ロール群１は、上述したように、複数のインク搬送ロールと、該インク搬送ロール間に配置される温度調整インク搬送ロール１ａとからなる。
　温度調整インク搬送ロール１ａは、芯部が中空の芯鞘構造となっており、該芯部に温水が流通するようになっている。これにより、ＵＶ硬化型インクの温度が調整される。なお、ＵＶ硬化型インクを温水で加熱する必要が無い場合は、温水を通さなくてもよく、逆に冷却が必要な場合は、冷水を流通させることも可能である。
　なお、上述したことと同様に、インク搬送ロールは、インキングロール又はアニロックスロールであり、温度調整インク搬送ロールは、芯鞘構造となったインキングロール又はアニロックスロールである。 In the offset printing press 10, as described above, the ink transport roll group 1 includes the plurality of ink transport rolls and the temperature control ink transport roll 1a disposed between the ink transport rolls.
The temperature control ink transport roll 1a has a core-sheath structure in which the core portion is hollow, and hot water flows through the core portion. Thereby, the temperature of the UV curable ink is adjusted. When it is not necessary to heat the UV curable ink with warm water, it is not necessary to pass warm water, and conversely, when cooling is required, it is possible to circulate cold water.
As described above, the ink transport roll is an inking roll or an anilox roll, and the temperature control ink transport roll is an inking roll or an anilox roll having a core-sheath structure.
　オフセット印刷機１０において、搬送ロール６の下方には、該搬送ロール６の形状に沿うように、Ｕ字状のガイド４が設けられている。このため、被印刷体８の一部が下方に垂れ、搬送ロール６間で被印刷体８を折れ曲がった状態で巻き込み、被印刷体８に皺ができる等の事態を防止することができる。
　また、搬送ロール６とガイド４との間には、被印刷体８が下方に垂れないように、図示しない送風機等により、エアーが吹付けられるようになっている。このため、被印刷体が下方に垂れることをより防止できる。 In the offset printing press 10, a U-shaped guide 4 is provided below the transport roll 6 so as to follow the shape of the transport roll 6. For this reason, it is possible to prevent a situation in which a part of the printing medium 8 hangs downward, and the printing medium 8 is folded between the transport rolls 6 and rolled up, and the printing medium 8 is wrinkled.
Further, air is blown between the transport roll 6 and the guide 4 by an air blower or the like (not shown) so that the printing medium 8 does not hang downward. For this reason, it is possible to further prevent the printing medium from hanging down.
　ここで、被印刷体８は、非吸水性の合成紙、プラスチックフィルム又は板紙であることが好ましい。
　これらの被印刷体８を用いることにより、製品（印刷体）を軽量化でき、且つ耐久性を付与することができる。 Here, it is preferable that the to-be-printed body 8 is a non-water absorbing synthetic paper, a plastic film, or a paper board.
By using these printing materials 8, the product (printed material) can be reduced in weight and durability can be imparted.
　なお、プラスチックフィルムとしては、特に限定されないが、例えば、ポリエステルフィルム、ポリエチレンフィルム、ポリエチレンナフタレートフィルム、ポリプロピレンフィルム、ポリアミドフィルム、ポリイミドフィルム、ポリビニルアルコールフィルム、ポリ塩化ビニルフィルム、ポリ塩化ビニリデンフィルム、ポリカーボネートフィルム、ポリスチレンフィルム、ポリアクリロニトリルフィルム、エチレン酢酸ビニル共重合体フィルム、エチレン－ビニルアルコール共重合体フィルム、エチレン－メタクリル酸共重合体フィルム、セルローストリアセテートフィルム、アイオノマーフィルム、セロハン等が用いられる。 The plastic film is not particularly limited. For example, polyester film, polyethylene film, polyethylene naphthalate film, polypropylene film, polyamide film, polyamide film, polyimide film, polyvinyl alcohol film, polyvinyl chloride film, polyvinylidene chloride film, polycarbonate film Polystyrene film, polyacrylonitrile film, ethylene vinyl acetate copolymer film, ethylene-vinyl alcohol copolymer film, ethylene-methacrylic acid copolymer film, cellulose triacetate film, ionomer film, cellophane etc. are used.
　オフセット印刷機１０においては、インク搬送ロール群１から水無し版２にＵＶ硬化型インクが付与され、水無し版２及びブランケット３を介して、被印刷体８に印刷されるようになっている。なお、これらの詳細については後述する。 In the offset printing press 10, the UV curable ink is applied from the ink transport roll group 1 to the waterless plate 2 and is printed on the printing material 8 through the waterless plate 2 and the blanket 3. . The details of these will be described later.
　ここで、オフセット印刷機１０においては、ＵＶ硬化型インクが用いられる。
　ＵＶ硬化型インクを用いるので、ＵＶを照射することにより、直ぐに後加工に取りかかることが可能であり、納期短縮にも繋がる。
　このとき、上述したように、版として水無し版２を用いることから、ＵＶ硬化型インクが、親油性であることが好ましい。
　親油性とすることにより、水無し版２の柄になる親油性部分に良くなじむという利点がある。 Here, in the offset printing press 10, a UV curable ink is used.
Since a UV curable ink is used, it is possible to immediately start post-processing by irradiating UV, and lead to shortening of delivery time.
At this time, as described above, since the waterless plate 2 is used as the plate, it is preferable that the UV curable ink be lipophilic.
By making it lipophilic, there is an advantage that the lipophilic portion to be a handle of the waterless version 2 is well blended.
　ＵＶ硬化型インクは、ＵＶ硬化樹脂、重合開始剤、顔料を含む。なお、溶剤、増感剤、重合禁止剤、消泡剤、界面活性剤等の添加剤を更に含んでいてもよい。
　ＵＶ硬化樹脂としては、重合可能なエチレン性二重結合を有するアクリレート系、メタクリレート系、不飽和ポリエステル系等が挙げられる。より具体的には、ポリエステルアクリレート、エポキシアクリレート、ウレタンアクリレート等が挙げられる。
　重合開始剤としては、ベンゾフェノン系、ベンゾイン系、アセトフェノン系、チオキサントン系等が挙げられる。 The UV curable ink contains a UV curable resin, a polymerization initiator, and a pigment. In addition, additives such as a solvent, a sensitizer, a polymerization inhibitor, an antifoaming agent, and a surfactant may be further included.
Examples of the UV curable resin include acrylate-based, methacrylate-based and unsaturated polyester-based resins having a polymerizable ethylenic double bond. More specifically, polyester acrylate, epoxy acrylate, urethane acrylate and the like can be mentioned.
Examples of the polymerization initiator include benzophenones, benzoins, acetophenones, and thioxanthones.
　また、後述するように、膜厚を十分に厚くすることができることから、ＵＶ硬化型インクには、機能性インキを含むことも可能である。
　ここで、機能性インキとしては、導電性インキ、絶縁インキ、示温インキ、親水性水発色インキ、香料インキ、紫外線発色インキ、蛍光インキ、蓄光インキ等が挙げられる。これらは、いずれも厚膜でのレベリングにより、その機能が発揮されるものである。ちなみに、一定の乾燥を得なければ、その機能は発揮されない。
　したがって、機能性インキを用いた場合、装飾性の向上だけでなく、その機能を十分に発揮させることができる。 Further, as described later, since the film thickness can be made sufficiently thick, the UV curable ink can also contain a functional ink.
Here, as the functional ink, a conductive ink, an insulating ink, a temperature-sensitive ink, a hydrophilic water coloring ink, a perfume ink, an ultraviolet coloring ink, a fluorescent ink, a luminous ink, etc. may be mentioned. All of these functions are exhibited by leveling with a thick film. By the way, if you do not get a certain amount of dryness, that function will not be exhibited.
Therefore, when functional ink is used, not only the decorativeness can be improved, but also its function can be fully exhibited.
　ＵＶ硬化型インクの使用時の温度は、２０℃～５０℃であることが好ましい。なお、この温度は、上述した温度調整インク搬送ロール１ａにより調整される。
　また、ＵＶ硬化型インクの使用時の温度が上記範囲内であることに加え、ＵＶ硬化型インクの使用時の粘度が、５Ｐａ・ｓ～１５００Ｐａ・ｓであることが好ましい。
　使用時において、ＵＶ硬化型インクの物性が、上記範囲内であると、水無し版２へのＵＶ硬化型インクの転移、ブランケット３へのＵＶ硬化型インクの転移、被印刷体８へのＵＶ硬化型インクの転移が、確実に且つ安定して行うことができる。 The temperature at which the UV curable ink is used is preferably 20 ° C. to 50 ° C. In addition, this temperature is adjusted by the temperature control ink conveyance roll 1a mentioned above.
In addition to the temperature at the time of use of the UV curable ink being in the above range, the viscosity at the time of use of the UV curable ink is preferably 5 Pa · s to 1500 Pa · s.
At the time of use, the physical properties of the UV curable ink are within the above range, transfer of the UV curable ink to the waterless plate 2, transfer of the UV curable ink to the blanket 3, and UV to the printing material 8 Transfer of the curable ink can be performed reliably and stably.
　ＵＶ照射機５は、印刷された被印刷体８にＵＶを照射する装置である。
　かかるＵＶ照射機５としては、特に限定されず、市販のものを適宜用いることができる。
　なお、ＵＶ照射機５は、オフセット印刷機１０の内部、例えば胴間等に設置してもよく、外部に設置してもよい。 The UV irradiator 5 is a device for irradiating the printed substrate 8 with UV.
The UV irradiator 5 is not particularly limited, and a commercially available one can be used as appropriate.
The UV irradiator 5 may be installed inside the offset printing press 10, for example, between cylinders, or may be installed outside.
　図２は、本実施形態に係るオフセット印刷機を用いた印刷方法を示すフローチャートである。
　図２に示すように、オフセット印刷機１０を用いた印刷方法は、インク搬送ロール群１により、水無し版２に付与されたＵＶ硬化型インクを、ブランケット３に転写した後、被印刷体８に印刷するオフセット印刷工程Ｓ１と、印刷された被印刷体８に、ＵＶを照射して、ＵＶ硬化型インクを硬化するＵＶ照射工程Ｓ２と、を有する。
　オフセット印刷機１０を用いた印刷方法においては、オフセット印刷工程Ｓ１とＵＶ照射工程Ｓ２とが連続して施される。 FIG. 2 is a flowchart showing a printing method using the offset printing press according to the present embodiment.
As shown in FIG. 2, in the printing method using the offset printing press 10, the UV curable ink applied to the waterless plate 2 is transferred to the blanket 3 by the ink transport roll group 1, and then the printing material 8 is printed. And an UV irradiation step S2 in which the printed substrate 8 is irradiated with UV to cure the UV curable ink.
In the printing method using the offset printing press 10, the offset printing step S1 and the UV irradiation step S2 are continuously performed.
　オフセット印刷工程Ｓ１においては、インク搬送ロール群１により、ＵＶ硬化型インクが水無し版２に付与される。
　ここで、オフセット印刷機１０を用いた印刷方法においては、インク搬送ロール群１を用いるので、水無し版２にＵＶ硬化型インクを付与する際、印刷速度が低速であっても、一定の量のインクを安定的に供給することができる。
　これに加え、インキングロールを用いた場合、ミストが発生するが、インク搬送ロール群を用いることにより、ミストの発生を防止できる。 In the offset printing step S 1, the UV curable ink is applied to the waterless plate 2 by the ink transport roll group 1.
Here, in the printing method using the offset printing press 10, since the ink transport roll group 1 is used, when applying the UV curable ink to the waterless plate 2, even if the printing speed is low, a constant amount The ink can be supplied stably.
In addition to this, when an inking roll is used, mist is generated, but generation of mist can be prevented by using the ink transport roll group.
　また、オフセット印刷機１０を用いた印刷方法においては、水無し版を用いるので、水付け量による画質のばらつきや水とＵＶ硬化型インクとによる乳化を防止できる。
　これに加え、画線部（印刷される部分）における静電気の影響も少なくすることができる。 Further, in the printing method using the offset printing press 10, since the waterless plate is used, it is possible to prevent the dispersion of the image quality due to the amount of watering and the emulsification of the water and the UV curable ink.
In addition to this, the influence of static electricity in the image area (the part to be printed) can be reduced.
　そして、水無し版２に付与されたＵＶ硬化型インクは、ゴム製のブランケット３に転写され、その後、被記録体８に印刷されることになる。
　このとき、被印刷体８の走行速度は、低速で行われる。なお、被印刷体８の走行速度と、被印刷体８への印刷速度とは対応するように同じになっている。したがって、被印刷体８の走行速度を低速にすることにより、被印刷体８への印刷速度が遅くなる。
　具体的には、被印刷体８の走行速度は、１７００ｍ／時以下であり、２５０ｍ／時～１７００ｍ／時であることが好ましく、２５０ｍ／時～１５００ｍ／時であることがより好ましい。
　被印刷体８の走行速度を１７００ｍ／時以下とすることにより、水無し版２からブランケット３へのＵＶ硬化型インクの転移性、ブランケット３から被印刷体８へのＵＶ硬化型インクの転移性を向上させることができる。なお、市販されている一般のオフセット印刷機における印刷速度は、最低で３０００ｍ／時である。 Then, the UV curable ink applied to the waterless plate 2 is transferred to the rubber blanket 3 and then printed on the recording material 8.
At this time, the traveling speed of the printing medium 8 is low. The traveling speed of the printing medium 8 and the printing speed of the printing medium 8 are the same so as to correspond to each other. Therefore, by setting the traveling speed of the printing medium 8 low, the printing speed on the printing medium 8 becomes slow.
Specifically, the traveling speed of the printing medium 8 is 1700 m / hour or less, preferably 250 m / hour to 1700 m / hour, and more preferably 250 m / hour to 1500 m / hour.
Transferability of the UV curable ink from the waterless plate 2 to the blanket 3 and transfer of the UV curable ink from the blanket 3 to the substrate 8 by setting the traveling speed of the substrate 8 to 1700 m / hour or less Can be improved. In addition, the printing speed in the common offset printing machine marketed is 3000 m / hour at the minimum.
　また、ＵＶ硬化型インクの濃度を上げることができ、転移量も増加させることができる。これにより、膜厚を厚くすることができる。
　具体的には、オフセット印刷機１０を用いた印刷方法において、付与されるＵＶ硬化型インクの膜厚は、３～７μｍである。なお、一般のオフセット印刷機におけるＵＶ硬化型インクの膜厚は、１～２μｍである。
　このように、膜厚を３～７μｍにすることができることから、装飾性の向上だけでなく、各種の機能性インキを用いて、その機能を十分に発揮することができる。
　さらに、ＵＶ照射を十分に行うことができ、ＵＶ硬化型インクの硬化強度を後加工に十分に耐え得るレベルに上げることができる。 Also, the concentration of the UV curable ink can be increased, and the transfer amount can also be increased. Thereby, the film thickness can be increased.
Specifically, in the printing method using the offset printing press 10, the film thickness of the UV curable ink applied is 3 to 7 μm. The film thickness of the UV curable ink in a general offset printing press is 1 to 2 μm.
As described above, since the film thickness can be 3 to 7 μm, it is possible not only to improve the decorativeness but also to fully exhibit the function using various functional inks.
Furthermore, UV irradiation can be performed sufficiently, and the curing strength of the UV curable ink can be raised to a level that can sufficiently withstand post-processing.
　本実施形態に係るオフセット印刷機１０においては、上述したように、被印刷体８を非吸水性の合成紙、プラスチックフィルム又はプラスチック板とし、印刷速度を上記範囲内とすることで、画像の成型性を向上させることができ、且つ、上述したように、ＵＶ硬化型インクを用いることで、後加工の速度に負担にならない速度でオフセット印刷を行うことが可能となる。
　ちなみ、吸水性の被印刷体とした場合、印刷速度が遅いと、吸水性の合成紙が空気中の水分を吸収し、ＵＶ硬化型インクを付与した場合、ＵＶ硬化型インクが滲んでしまう場合がある。 In the offset printing press 10 according to the present embodiment, as described above, the printed material 8 is made of non-water absorbent synthetic paper, plastic film or plastic plate, and the printing speed is in the above range to form an image. It is possible to improve the properties, and as described above, by using the UV curable ink, it is possible to perform offset printing at a speed at which the post-processing speed is not a burden.
In the case of a water-absorbent printed material, when the printing speed is slow, the water-absorbent synthetic paper absorbs the moisture in the air, and when the UV-curable ink is applied, the UV-curable ink bleeds. There is.
　ＵＶ照射工程Ｓ２においては、印刷された被印刷体８に、ＵＶを照射して、ＵＶ硬化型インクを硬化する。
　ＵＶの照射方法は、特に限定されず、従来公知の方法で行えばよい。 In the UV irradiation step S2, the printed substrate 8 is irradiated with UV to cure the UV curable ink.
The UV irradiation method is not particularly limited, and may be performed by a conventionally known method.
　以上の工程を経ることにより、本実施形態に係るオフセット印刷機１０を用いた印刷方法によれば、画像の成型性に優れる印刷体が得られる。 Through the above steps, according to the printing method using the offset printing press 10 according to the present embodiment, a print having excellent image formability can be obtained.
　本実施形態に係るオフセット印刷機１０においては、オフセット印刷工程Ｓ１とＵＶ照射工程Ｓ２とを連続して施した後、後加工を施すことが好ましい。すなわち、オフセット印刷し、ＵＶ照射を施した後、後加工が施されることが好ましい。この場合、装飾性に優れる印刷体を得ることができる。 In the offset printing press 10 according to the present embodiment, it is preferable to apply post-processing after the offset printing step S1 and the UV irradiation step S2 have been successively performed. That is, after offset printing and UV irradiation, post-processing is preferably performed. In this case, a print having excellent decorativeness can be obtained.
　後加工としては、例えば、シルクスクリーン印刷、フレキソ印刷、ローラーコート、塗装、成型等が挙げられる。
　これらの中でも、後加工は、シルクスクリーン印刷であることが好ましい。この場合、装飾性に優れる印刷体を得ることができる。この場合、オフセット印刷とシルクスクリーン印刷との印刷速度を一致させることができるので、オフセット印刷（オフセット印刷工程Ｓ１及びＵＶ照射工程Ｓ２）とシルクスクリーン印刷とを連続して施すことができる。 Examples of post-processing include silk screen printing, flexographic printing, roller coating, painting, molding and the like.
Among these, post-processing is preferably silk screen printing. In this case, a print having excellent decorativeness can be obtained. In this case, since the printing speeds of offset printing and silk screen printing can be made to coincide with each other, offset printing (offset printing step S1 and UV irradiation step S2) and silk screen printing can be performed successively.
　本発明は、被印刷体に対しＵＶ硬化型インクを付与するオフセット印刷機を用いた印刷方法として用いられる。本発明のオフセット印刷機を用いた印刷方法によれば、画像の成型性に優れる印刷体が得られる。 The present invention is used as a printing method using an offset printing press for applying a UV curable ink to a substrate. According to the printing method using the offset printing press of the present invention, a print having excellent formability of an image can be obtained.
　１・・・インク搬送ロール群
　１ａ・・・温度調整インク搬送ロール
　２・・・水無し版
　３・・・ブランケット
　４・・・ガイド
　５・・・ＵＶ照射機
　６・・・搬送ロール
　８・・・被印刷体
　１０・・・オフセット印刷機
　Ｓ１・・・オフセット印刷工程
　Ｓ２・・・ＵＶ照射工程 DESCRIPTION OF SYMBOLS 1 ... Ink conveyance roll group 1a ... Temperature control ink conveyance roll 2 ... Waterless version 3 ... Blanket 4 ... Guide 5 ... UV irradiation machine 6 ... conveyance roll 8 ... · Printed material 10 ··· Offset printing machine S1 · · · Offset printing process S2 · · · UV irradiation process

Claims (9)

  1. 　被印刷体を搬送する複数の搬送ロールと、該搬送ロールに隣接するブランケットと、該ブランケットに隣接する水無し版と、該水無し版に隣接するインク搬送ロール群と、印刷された前記被印刷体にＵＶを照射するＵＶ照射機と、を有するオフセット印刷機を用いた印刷方法であって、
    　前記水無し版に付与されたＵＶ硬化型インクを、前記ブランケットに転写した後、前記被印刷体に印刷するオフセット印刷工程と、
    　印刷された前記被印刷体に、ＵＶを照射して、前記ＵＶ硬化型インクを硬化するＵＶ照射工程と、
    を有し、
    　前記被印刷体の走行速度が、１７００ｍ／時以下であり、
    　付与される前記ＵＶ硬化型インクの膜厚が３～７μｍであるオフセット印刷機を用いた印刷方法。     A plurality of transport rolls for transporting a substrate, a blanket adjacent to the transport rolls, a waterless plate adjacent to the blanket, a group of ink transport rolls adjacent to the waterless plate, and the printed substrate And a UV irradiator for irradiating the body with UV.
    An offset printing step of printing a UV curable ink applied to the waterless plate onto the substrate after transferring the UV curable ink onto the blanket;
    A UV irradiation step of irradiating the printed substrate with UV to cure the UV curable ink;
    Have
    The traveling speed of the printing material is 1700 m / h or less,
    A printing method using an offset printing press in which the film thickness of the UV curable ink to be applied is 3 to 7 μm.
  2. 　前記被印刷体の走行速度が、２５０ｍ／時～１７００ｍ／時である請求項１記載のオフセット印刷機を用いた印刷方法。 The printing method using an offset printing press according to claim 1, wherein the traveling speed of the printing medium is 250 m / hour to 1700 m / hour.
  3. 　前記被印刷体が、非吸水性の合成紙、プラスチックフィルム又は板紙である請求項１又は２に記載のオフセット印刷機を用いた印刷方法。 The printing method using the offset printing press according to claim 1 or 2, wherein the printing material is non-water absorbent synthetic paper, plastic film or paper board.
  4. 　前記インク搬送ロール群が、前記ＵＶ硬化型インクの温度を調整するための温度調整インク搬送ロールを備え、
    　該温度調整インク搬送ロールの芯部に温水が流通するようになっている請求項１～３のいずれか１項に記載のオフセット印刷機を用いた印刷方法。     The ink transport roll group includes a temperature control ink transport roll for adjusting the temperature of the UV curable ink.
    The printing method using an offset printing press according to any one of claims 1 to 3, wherein hot water is circulated through the core portion of the temperature control ink transport roll.
  5. 　前記温度調整インク搬送ロールにより、前記ＵＶ硬化型インクの使用時の温度を２０℃～５０℃に調整し、且つ、前記ＵＶ硬化型インクの使用時の粘度を５Ｐａ・ｓ～１５００Ｐａ・ｓとする請求項４記載のオフセット印刷機を用いた印刷方法。 The temperature at the time of use of the UV curable ink is adjusted to 20 ° C. to 50 ° C., and the viscosity at the time of use of the UV curable ink is set to 5 Pa · s to 1500 Pa · s by the temperature control ink transport roll. A printing method using the offset printing press according to claim 4.
  6. 　前記搬送ロールの下方には、該搬送ロールの形状に沿うように、Ｕ字状のガイドが設けられている請求項１～５のいずれか１項に記載のオフセット印刷機を用いた印刷方法。 The printing method using the offset printing press according to any one of claims 1 to 5, wherein a U-shaped guide is provided below the transport roll so as to conform to the shape of the transport roll.
  7. 　前記搬送ロールと前記ガイドとの間には、前記被印刷体が下方に垂れないようにエアーが吹付けられている請求項６記載のオフセット印刷機を用いた印刷方法。 The printing method using the offset printing press according to claim 6, wherein air is blown between the transport roll and the guide so as to prevent the printing medium from hanging down.
  8. 　オフセット印刷し、ＵＶ照射を施した後、後加工が施される請求項１～７のいずれか１項に記載のオフセット印刷機を用いた印刷方法。 The printing method using the offset printing press according to any one of claims 1 to 7, wherein after offset printing and UV irradiation are performed, post-processing is performed.
  9. 　前記後加工がシルクスクリーン印刷である請求項８記載のオフセット印刷機を用いた印刷方法。 The printing method using an offset printing press according to claim 8, wherein the post-processing is silk screen printing.
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WO2017185221A1 (en) * 2016-04-25 2017-11-02 万军霞 Method for making single-bottom single-face three-dimensional image

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