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WO2018061547A1 - Appareil d'impression à jet d'encre et procédé de rinçage associé - Google Patents

Appareil d'impression à jet d'encre et procédé de rinçage associé Download PDF

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Publication number
WO2018061547A1
WO2018061547A1 PCT/JP2017/030379 JP2017030379W WO2018061547A1 WO 2018061547 A1 WO2018061547 A1 WO 2018061547A1 JP 2017030379 W JP2017030379 W JP 2017030379W WO 2018061547 A1 WO2018061547 A1 WO 2018061547A1
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WO
WIPO (PCT)
Prior art keywords
printing
printing apparatus
inkjet
paper
ink droplets
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2017/030379
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English (en)
Japanese (ja)
Inventor
祐二 黒川
稔 小松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Screen Holdings Co Ltd
Original Assignee
Screen Holdings Co Ltd
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 Screen Holdings Co Ltd filed Critical Screen Holdings Co Ltd
Publication of WO2018061547A1 publication Critical patent/WO2018061547A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles

Definitions

  • the present invention relates to an inkjet printing apparatus that discharges ink droplets to perform printing on a printing paper and a flushing method thereof, and in particular, discharges ink droplets to eliminate or prevent ejection defects caused by ink drying. It relates to flushing technology.
  • the inkjet printing apparatus performs printing by ejecting ink droplets from an inkjet head to form an image on a printing paper.
  • the ink jet head ejects ink droplets from a plurality of fine nozzles, but the nozzles may be clogged due to drying of the ink droplets.
  • nozzle chipping occurs, and the print quality of the printed matter is degraded. Therefore, ink droplets are not ejected for printing, but ink droplets are ejected to eliminate or prevent missing nozzles. This is generally called “flushing”.
  • ink droplets are ejected simultaneously from a plurality of nozzles arranged in a direction perpendicular to the transport direction outside the printing area between the printing areas, or it is difficult to see in the printing area.
  • the former is referred to as “lainflushing” and the latter is referred to as “discrete flushing” (also referred to as star flushing).
  • the above-mentioned nozzle missing problem is conspicuously generated in the back surface printing machine among the ink jet printing apparatuses that are equipped with the back surface printing apparatus on the downstream side of the front surface printing apparatus and are compatible with double-sided printing. This is because in the front surface printing apparatus, the printing paper is wound around the heat roller and dried at a high temperature after printing, and the back surface printing apparatus arranged on the downstream side prints on the dried printing paper. When printing on a dry printing paper, the gap between the printing surface of the printing paper and the ink-jet head is in a low humidity environment, so that nozzle missing is likely to occur.
  • an apparatus including a gas supply unit that supplies gas for suppressing drying of ink droplets between an inkjet head and a printing surface of a printing paper has been proposed (for example, , See Patent Document 1).
  • the gas for suppressing the drying of the ink droplet contains a solvent and water vapor contained in the ink droplet. Thereby, drying of the ink droplet in an inkjet head is suppressed and nozzle missing is suppressed.
  • the conventional example having such a configuration has the following problems. That is, the conventional apparatus supplies gas to the printing surface side of the printing paper and humidifies it. Therefore, there is a problem that printing due to ink droplets blurs and print quality deteriorates.
  • the present invention has been made in view of such circumstances, and by humidifying the opposite side of the printing surface, it is possible to suppress the discharge amount of flushing and maintain good printing quality. It is an object of the present invention to provide an inkjet printing apparatus and a flushing method thereof.
  • the present invention has the following configuration. That is, the present invention provides an inkjet printing apparatus that performs printing by ejecting ink droplets, and an inkjet head that includes a plurality of nozzles that eject ink droplets on a printing paper on the nozzle surface, and is spaced apart from the nozzle surface.
  • Printing is performed by ejecting ink droplets from the inkjet head while transporting the printing paper by the humidifying gas supplying means for supplying gas and supplying the humidified gas from the humidifying gas supplying means. Therefore, the ink droplet ejection amount is less than the ink droplet ejection amount when the humidified gas supply means is deactivated. And it is characterized in that it comprises a control means for causing the flushing.
  • the gas supplied from the humidified gas supply means operated by the control means permeates and evaporates from the opposite side of the printing surface of the printing paper to the printing of the printing paper.
  • the humidity between the surface and the nozzle surface of the inkjet head is increased. Accordingly, since drying of ink droplets in the ink jet head can be suppressed, flushing performed for eliminating nozzle missing or preventing nozzle missing is based on the ejection amount of ink droplets when the humidified gas supply means is not operated as a reference. Can be performed with a small discharge amount. Further, since humidification is performed from the opposite side of the printing surface of the printing paper, ink bleeding on the printing surface can be minimized. Therefore, it is possible to maintain the print quality favorably.
  • the humidified gas supply means add a surfactant to a liquid for humidifying the gas.
  • the liquid can be adhered uniformly to the opposite side of the printing surface of the printing paper. Accordingly, the humidity distribution in the space between the printing surface of the printing paper and the nozzle surface of the ink jet head can be made uniform. Prevention can be achieved.
  • control means sets the flushing to discrete flushing.
  • the discharge amount is small so as not to deteriorate the printing quality.
  • the discharge amount in a dry environment with low humidity, etc., if the discharge amount is small, it may be insufficient for eliminating nozzle chipping or preventing nozzle chipping. Therefore, it is possible to sufficiently contribute to the elimination of nozzle missing and the prevention of nozzle missing while reducing the discharge amount of discrete flushing.
  • the humidification amount of the gas is preferably 10 to 11 [g / m 2 ].
  • the humidity environment on the printing surface side of the printing paper can be made suitable, and the discharge amount of the nozzle can be reduced and the nozzle loss can be prevented. Can be done by flushing.
  • the printing paper is subjected to a printing process by ejecting ink droplets onto the opposite surface of the printing surface under a predetermined printing condition, and is subjected to a heating process for drying the opposite surface. It is preferable that
  • the printing paper When printing is performed on printing paper that has been subjected to printing and heat treatment, the printing paper is particularly dry, so there is a low humidity environment between the nozzle surface of the inkjet head and the printing surface of the printing paper. Cheap.
  • the improvement by supplying the gas humidified by the humidified gas supply means can be particularly expected.
  • the humidified gas supply means sets the gas humidity to be higher as the conveyance speed is higher in accordance with the printing conditions.
  • the drying process needs to be performed quickly, so the printing paper may be particularly hot. Accordingly, since the humidity of the printing paper is low, it is possible to suitably eliminate nozzle chipping and prevent nozzle chipping by increasing the gas humidity so as to compensate for it.
  • the present invention provides a flushing method for an ink jet printing apparatus that performs printing by ejecting ink droplets, while transporting the printing paper on the upstream side in the transport direction of the printing paper with respect to the ink jet head that ejects ink droplets.
  • a humidified gas supply process for supplying a humidified gas to a surface of the printing paper opposite to the printing surface by the inkjet head, and printing on the printing surface of the printing paper by discharging ink droplets from the inkjet head.
  • a treatment process in which flushing is performed by reducing the ink droplet ejection amount in comparison with the ink droplet ejection amount when the humidified gas supply process is not performed.
  • the gas supplied in the humidified gas supply process penetrates and evaporates from the opposite side of the printing surface of the printing paper to the printing surface of the printing paper and the nozzle of the inkjet head. Increase the humidity between the surfaces. Therefore, drying of the ink droplets in the ink jet head can be suppressed, so that the flushing performed for eliminating the nozzle missing or preventing the nozzle missing in the printing process is based on the state where the humidified gas supply means is not operated.
  • the discharge can be performed with a discharge amount smaller than the discharge amount.
  • since humidification is performed from the opposite side of the printing surface of the printing paper it is possible to minimize ink bleeding on the printing surface in the process. Therefore, it is possible to maintain the print quality favorably.
  • the gas supplied from the humidified gas supply means operated by the control means penetrates the printing surface from the opposite side of the printing surface of the printing paper and evaporates to print the printing paper.
  • the humidity between the surface and the nozzle surface of the inkjet head is increased. Accordingly, since drying of ink droplets in the ink jet head can be suppressed, flushing performed for eliminating nozzle missing or preventing nozzle missing is based on the ejection amount of ink droplets when the humidified gas supply means is not operated as a reference. Can be performed with a small discharge amount. Further, since humidification is performed from the opposite side of the printing surface of the printing paper, ink bleeding on the printing surface can be minimized. Therefore, it is possible to maintain the print quality favorably.
  • FIG. 1 is an overall configuration diagram illustrating a schematic configuration of an inkjet printing system according to an embodiment. It is a whole block diagram which shows schematic structure of a humidifier. It is data which shows the change of the chipping rate according to the humidification amount. It is a graph of the data of FIG. It is data which shows the change of the chipping rate at the time of reducing the flushing amount on condition of a fixed humidification amount.
  • FIG. 1 is an overall configuration diagram illustrating a schematic configuration of an inkjet printing system according to an embodiment
  • FIG. 2 is an overall configuration diagram illustrating a schematic configuration of a humidifier.
  • the inkjet printing system 1 includes a paper feeding unit 3, a front surface printing device 5, a humidifying device 7, a reversing device 8, a back surface printing device 9, and a paper discharge unit 11.
  • the paper feed unit 3 holds the roll-shaped continuous paper WP so as to be rotatable around the horizontal axis, and feeds the continuous paper WP to the front surface printing device 5 by unwinding it.
  • the surface printing apparatus 5 is an ink jet printing apparatus that forms an image by ejecting ink droplets, and performs printing on the surface of the continuous paper WP.
  • the humidifying device 7 supplies the humidified gas to the printing surface (front surface) of the continuous paper WP printed by the front surface printing device 5. In other words, the humidified gas is supplied to the opposite surface of the printing surface printed by the back surface printing device 9.
  • the reversing device 8 includes a plurality of turn bars (not shown) and reverses the upper and lower surfaces of the continuous paper WP.
  • the back surface of the continuous paper WP is reversed upward.
  • the back surface printing device 9 has the same configuration as the front surface printing device 5, for example, and performs printing on the back surface of the continuous paper WP.
  • the paper discharge unit 11 winds the continuous paper WP processed by the front surface printing device 5 and the back surface printing device 9 around a horizontal axis.
  • a cooling device that cools the continuous paper WP printed by the front surface printing device 5 may be disposed between the front surface printing device 5 and the back surface printing device 9 described above. Even if such a cooling device is arranged, the humidified device 7 is effective because the continuous paper WP once heated is dry.
  • the continuous paper WP described above corresponds to “printing paper” in the present invention.
  • the front surface printing apparatus 5 includes a driving roller 13 for taking in the continuous paper WP from the paper feeding unit 3 on the upstream side.
  • the continuous paper WP unwound from the paper feeding unit 3 by the driving roller 13 is conveyed downstream along the plurality of conveying rollers 15.
  • the front surface printing apparatus 5 includes a driving roller 17 at the most downstream side. Between the driving roller 13 and the driving roller 17, a printing unit 19, a heat roller 21, and an inspection unit 23 are arranged from the upstream side.
  • the printing unit 19 includes an inkjet head 25.
  • the heat roller 21 incorporates a heat source and heats the continuous paper WP wound around the outer peripheral surface to dry the printing surface.
  • the inspection unit 23 inspects the image printed on the continuous paper WP.
  • the drive roller 13, the transport roller 15, and the heat roller 21 described above correspond to the “transport means” in the present invention.
  • the printing unit 19 includes, for example, four inkjet heads 25. Specifically, in order from the upstream side, a black (K) inkjet head 25, a cyan (C) inkjet head 25, a magenta (M) inkjet head 25, and a yellow (Y) inkjet head. And a head 25.
  • the inkjet heads 25 are arranged at a predetermined interval along the conveyance direction of the continuous paper WP.
  • each inkjet head 25 is formed with a plurality of nozzles on the nozzle surface facing the printing surface side of the continuous paper WP.
  • the ink droplets ejected by the inkjet head 25 are aqueous pigments.
  • the back surface printing device 9 has substantially the same configuration as the surface printing device 5 described above. Here, only the configuration different from the front surface printing apparatus 5 will be described.
  • the driving roller 13 of the back surface printing device 9 takes in the continuous paper WP that has been printed by the front surface printing device 5, then heated, further humidified by the humidifying device 7, and reversed by the reversing device 8.
  • the printing unit 19 of the back surface printing apparatus 9 performs printing on the back surface of the continuous paper WP in which the back surface serving as the printing surface is oriented upward.
  • the above-described inkjet printing system 1 is comprehensively controlled by the control unit 27.
  • the control unit 27 includes a CPU, a memory, and the like (not shown).
  • the control unit 27 controls printing of the front surface printing device 5 and the back surface printing device 9 and controls the humidifying device 7 according to the printing conditions of the front surface printing device 5. Specifically, for example, when the printing speed in the front surface printing device 5 is faster than the reference value, the control unit 27 operates to increase the humidification amount in the humidification device 7 beyond the reference amount.
  • control unit 27 described above corresponds to the “control unit” in the present invention.
  • the humidifier 7 includes a transport roller 13, a humidified gas generator 31, a liquid supply unit 33, and a surfactant supply unit 35.
  • the transport roller 13 guides the continuous paper WP from the front surface printing device 5 toward the back surface printing device 9.
  • the liquid supply unit 33 supplies a main liquid for humidifying the gas.
  • the surfactant supply unit 35 supplies the surfactant to the humidified gas generator 31.
  • the humidified gas generator 31 adds a sea surface activator to the main liquid from the liquid supply unit 35 to humidify the gas (for example, air).
  • the humidification amount is operated by the control unit 27.
  • the liquid is, for example, water or a solvent contained in the ink ejected from the inkjet head 25.
  • the humidified gas generator 31 supplies a humidified gas toward the continuous paper WP.
  • the gas supply surface is the surface SF1 of the continuous paper WP that has been printed by the surface printing device 5.
  • the front surface SF1 is a surface opposite to the back surface SF2 of the continuous paper WP to be printed from now on by the back surface printing apparatus 9.
  • the humidifier 7 described above corresponds to the “humidified gas supply means” in the present invention.
  • FIG. 3 is data showing a change in the chipping rate according to the humidification amount
  • FIG. 4 is a graph of the data in FIG. 3
  • FIG. 5 is a graph showing a decrease in the flushing amount under a constant humidification amount condition. It is data which shows the change of the chipping rate at the time of making it.
  • the printing conditions are resolution: 1200 dpi ⁇ 600 dpi, transport speed: 75 mpm, discharge amount in discrete flushing: 2.2 dots / A4, and printing is performed while performing discrete flushing on continuous paper WP over 100 m.
  • the water content of the continuous paper WP at the entrance of the front surface printing device 5 (front machine entrance) and the water content of the continuous paper WP at the entrance of the back surface printing device 9 (back machine entrance) are also shown. . From these values, it can be seen that the continuous paper WP is dried more than before the printing process by the drying process by the heat roller 21 after the printing process by the front surface printing apparatus 5.
  • the humidifier 7 described above performs humidification of at least 10 [g / m 2 ] on the continuous paper WP under the control of the control unit 27.
  • FIG. 5 shows that discrete flushing is performed on the continuous paper WP over 100 m with the printing conditions fixed at a resolution of 600 dpi ⁇ 600 dpi, a conveyance speed of 120 mpm, and a humidification amount of 2.7 [g / m 2 ].
  • This is data indicating the state of occurrence of missing nozzles during printing.
  • the discharge amount in discrete flushing was reduced from 4.5 dots / A4 to a minimum of 2.2 dots / A4, respectively.
  • the reason why the humidification amount is set to a small value of 2.7 [g / m 2 ] is to cause nozzle missing even when there is humidification for comparison with non-humidification.
  • the control unit 27 operates the humidifier 7 to humidify the surface SF1 of the continuous paper WP by 10 to 11 [g / m 2 ].
  • the discharge amount of discrete flushing during printing in the back surface printing apparatus 9 is made smaller than the discharge amount of discrete flushing when not humidifying.
  • the gas that is operated by the control unit 27 and supplied from the humidifying device 7 penetrates and evaporates from the front surface SF1 on the opposite side of the back surface SF2 of the continuous paper WP to the back surface SF2.
  • the humidity between the back surface SF ⁇ b> 2 and the nozzle surface of the inkjet head 25 is increased (humidified gas supply process). Accordingly, since drying of ink droplets in the ink jet head 25 can be suppressed, discrete flushing performed during the printing process for eliminating nozzle missing or preventing nozzle missing is based on a state in which the humidifying device 7 is not operated. In this case, the discharge amount can be smaller than the discharge amount of the ink droplets (processing step). Further, since the humidification is performed from the front surface SF1 which is the opposite surface of the back surface SF2 of the continuous paper WP, ink bleeding on the back surface SF2 can be minimized. Therefore, it is possible to maintain the print quality favorably.
  • the liquid can be uniformly attached to the surface SF1 which is the opposite surface of the back surface SF2 in the continuous paper WP. Accordingly, the humidity distribution in the space between the back surface SF2 of the continuous paper WP and the nozzle surface of the inkjet head 25 can be made uniform, so that the discharge amount of discrete flushing at the plurality of nozzles provided in the inkjet nozzle 25 can be made uniform. Therefore, it is possible to sufficiently eliminate nozzle missing or prevent nozzle missing.
  • the present invention is not limited to the above embodiment, and can be modified as follows.
  • the continuous paper WP has been described as an example of the printing paper.
  • the present invention is not limited to the continuous paper WP. That is, the present invention can be applied even to a paper print medium excluding a film that does not easily transmit a humidified gas, for example, a sheet paper (single sheet paper).
  • the humidification amount is 10 to 11 [g / m 2 ], but the present invention is not limited to this value. In other words, it may be adjusted according to the type of printing paper, printing conditions, environment in which the apparatus is arranged, and the like.
  • the humidifier 7 is configured to add the surfactant to the liquid, but it is not essential for the present invention to add the surfactant.
  • the humidifying device 7 is arranged downstream of the surface printing device 5 and upstream of the reversing device 8, but the present invention is not limited to such an arrangement. That is, if the humidified gas can be added to the continuous paper WP before printing in the back surface printing device 9, the same effect can be obtained.
  • the humidifying device 7 is arranged upstream of the back surface printing device 9, but the present invention is not limited to this. That is, when the front and back printing order is reversed, the humidifying device 7 may be disposed upstream of the front surface printing device 5.
  • the present invention is not limited to the duplex printing apparatus having such a configuration.
  • the special color ink is preliminarily applied to the entire printing area of the continuous paper WP, or the special coating for smoothing the printing surface is preliminarily applied to the continuous paper WP, the continuous paper WP is dry. Therefore, what is necessary is just to comprise so that it may humidify before performing the first printing.
  • the present invention is suitable for an inkjet printing apparatus that performs printing by discharging ink droplets.

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  • Ink Jet (AREA)

Abstract

Un gaz fourni à partir d'un dispositif d'humidification (7) pénètre dans la surface arrière (SF2) d'un papier continu (WP) et s'évapore, ce qui permet d'augmenter l'humidité au niveau de la surface de buse de têtes à jet d'encre (25). Comme il est possible de limiter le séchage de gouttelettes d'encre sur les têtes à jet d'encre (25), il est possible de réaliser un rinçage discret avec de petits volumes de décharge. Comme l'humidification est réalisée à partir de la surface avant (SF1), qui est la surface opposée du papier continu (WP), il est possible de maintenir un écoulement d'encre au niveau de la surface arrière (SF2) à un minimum. Il est par conséquent possible de maintenir une bonne qualité d'impression.
PCT/JP2017/030379 2016-09-27 2017-08-24 Appareil d'impression à jet d'encre et procédé de rinçage associé Ceased WO2018061547A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-188206 2016-09-27
JP2016188206A JP2018051826A (ja) 2016-09-27 2016-09-27 インクジェット印刷装置及びそのフラッシング方法

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WO2018061547A1 true WO2018061547A1 (fr) 2018-04-05

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Publication number Priority date Publication date Assignee Title
JP7061936B2 (ja) * 2018-06-28 2022-05-02 株式会社Ｓｃｒｅｅｎホールディングス インクジェット印刷システム
JP7449134B2 (ja) 2020-03-23 2024-03-13 株式会社Ｓｃｒｅｅｎホールディングス 印刷方法および印刷装置
US12045521B1 (en) 2023-02-21 2024-07-23 Ricoh Company, Ltd. Halftone modification mechanism

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JP2007326322A (ja) * 2006-06-09 2007-12-20 Matsushita Electric Ind Co Ltd 記録装置および液状体
JP2011161897A (ja) * 2010-02-15 2011-08-25 Canon Inc インクジェット記録装置及びインクジェット記録方法
JP2011255573A (ja) * 2010-06-08 2011-12-22 Canon Inc 記録方法および記録装置
JP2012111081A (ja) * 2010-11-22 2012-06-14 Seiko Epson Corp 画像記録装置、及び、画像記録方法
US20130235140A1 (en) * 2008-01-16 2013-09-12 Sun Chemical, B.V. Ink jet printer and an ink jet printing process
JP2014024249A (ja) * 2012-07-26 2014-02-06 Canon Inc インクジェット記録装置
JP2015000508A (ja) * 2013-06-14 2015-01-05 キヤノン株式会社 プリント方法および装置
JP2015196372A (ja) * 2014-04-03 2015-11-09 セイコーエプソン株式会社 液体噴射装置及び液体噴射方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007326322A (ja) * 2006-06-09 2007-12-20 Matsushita Electric Ind Co Ltd 記録装置および液状体
US20130235140A1 (en) * 2008-01-16 2013-09-12 Sun Chemical, B.V. Ink jet printer and an ink jet printing process
JP2011161897A (ja) * 2010-02-15 2011-08-25 Canon Inc インクジェット記録装置及びインクジェット記録方法
JP2011255573A (ja) * 2010-06-08 2011-12-22 Canon Inc 記録方法および記録装置
JP2012111081A (ja) * 2010-11-22 2012-06-14 Seiko Epson Corp 画像記録装置、及び、画像記録方法
JP2014024249A (ja) * 2012-07-26 2014-02-06 Canon Inc インクジェット記録装置
JP2015000508A (ja) * 2013-06-14 2015-01-05 キヤノン株式会社 プリント方法および装置
JP2015196372A (ja) * 2014-04-03 2015-11-09 セイコーエプソン株式会社 液体噴射装置及び液体噴射方法

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