WO2015174510A1 - インクジェット印刷装置、インクセット、及びインクジェット印刷方法 - Google Patents
インクジェット印刷装置、インクセット、及びインクジェット印刷方法 Download PDFInfo
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- WO2015174510A1 WO2015174510A1 PCT/JP2015/063970 JP2015063970W WO2015174510A1 WO 2015174510 A1 WO2015174510 A1 WO 2015174510A1 JP 2015063970 W JP2015063970 W JP 2015063970W WO 2015174510 A1 WO2015174510 A1 WO 2015174510A1
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Images
Classifications
-
- 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
- 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
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
-
- 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
- B41M1/14—Multicolour printing
- B41M1/18—Printing one ink over another
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
- B41M5/0017—Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
-
- 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
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
- B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
Definitions
- the present invention relates to an ink jet printing apparatus, an ink set, and an ink jet printing method.
- Patent Literature 1 An ink set described in Patent Literature 1 is known as an ink set including a plurality of inks ejected from an inkjet printing apparatus.
- the ink set described in Patent Document 1 includes a metallic ink (first ink) in which metal powder is dispersed, and a second ink that contains a polymerizable compound that is polymerized by ultraviolet irradiation or the like more than the metallic ink. I have.
- the metallic ink is ejected onto the printing pattern of the second ink formed on the recording medium, thereby improving the adhesion between the printing pattern of the metallic ink and the recording medium.
- the ink jet printing apparatus described in Patent Document 2 includes an ultraviolet irradiation device that irradiates ultraviolet light to such an extent that UV ink (ultraviolet curable ink) does not bleed. Then, ultraviolet rays are irradiated to the UV ink a predetermined number of times from this ultraviolet irradiation device, so that the UV ink is prevented from spreading and the ultraviolet irradiation device is miniaturized.
- an ultraviolet irradiation device that irradiates ultraviolet light to such an extent that UV ink (ultraviolet curable ink) does not bleed. Then, ultraviolet rays are irradiated to the UV ink a predetermined number of times from this ultraviolet irradiation device, so that the UV ink is prevented from spreading and the ultraviolet irradiation device is miniaturized.
- JP 2012-193261 A released on October 11, 2012
- JP 2004-188920 A published July 8, 2004
- the ink set described in Patent Document 1 includes only the second ink ejected to enhance the adhesion between the recording medium and the metallic ink and the metallic ink, printing of colors other than the metallic color is performed. In order to form a pattern, it is necessary to prepare a color ink set or the like separately.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an ink set capable of forming a metallic ink printing pattern having excellent glossiness without causing ink bleeding. There is.
- an inkjet printing apparatus is an inkjet printing apparatus that ejects ink that is cured by being irradiated with ultraviolet rays, and ejects ink contained in an ink set onto a recording medium.
- An ultraviolet irradiation unit that irradiates the ink ejected from the ejection unit and landed on the recording medium; and an ultraviolet irradiation unit that changes the light intensity of the ultraviolet ray irradiated from the ultraviolet irradiation unit.
- Light amount changing means for changing the amount of ultraviolet light applied to the ink from the ink, and the light amount changing means is discharged from the discharge means in the forward path in which the ultraviolet light irradiation means moves in the scanning direction.
- a first light quantity of ultraviolet light that temporarily cures the ink that has landed on the recording medium is arranged behind the ejection unit in the scanning direction.
- the ultraviolet irradiation means emits a second light quantity of ultraviolet light for main curing the ink that has been temporarily cured.
- the ink set includes a color UV ink that includes an ultraviolet curable resin and a colorant and does not include metal particles, and a solvent UV ink that includes an ultraviolet curable resin, a solvent, and metal particles. It is characterized by having.
- the inkjet printing method is an inkjet printing method in which printing is performed using ink that is cured by being irradiated with ultraviolet rays, and includes an ejection step of ejecting ink contained in an ink set onto a recording medium, and ultraviolet irradiation.
- the amount of ultraviolet light emitted from the ultraviolet irradiation means is changed, and the light intensity of the ultraviolet light emitted from the ultraviolet irradiation means is changed, thereby being discharged in the discharge step onto the recording medium.
- a second main curing of the ink temporarily cured in the first ultraviolet irradiation step is performed by changing the light intensity of the ultraviolet rays irradiated from the outside irradiation unit and the light intensity of the ultraviolet rays irradiated from the ultraviolet irradiation unit.
- a second ultraviolet irradiation step of irradiating the ink temporarily cured in the first ultraviolet irradiation step with ultraviolet rays from the ultraviolet irradiation means and the ink set is an ultraviolet curable type It is characterized by comprising a color UV ink containing a resin and a colorant and no metal particles, and a solvent UV ink containing an ultraviolet curable resin, a solvent and metal particles.
- the ink jet printing apparatus of the present invention when ink from the ink set is ejected from the ejection means, the ink lands on the recording medium.
- the first amount of ultraviolet light is irradiated from the ultraviolet irradiation means
- the ink that has landed on the recording medium is temporarily cured.
- the second light quantity of ultraviolet light is irradiated from the ultraviolet irradiation means
- the temporarily cured ink is fully cured.
- the ink can be temporarily cured and the ink can be fully cured by changing the amount of ultraviolet light emitted from the ultraviolet irradiation means.
- the ink can be shared for the main curing and the main curing of the ink, and the cost can be reduced and the ink can be cured efficiently.
- the ink discharged from the discharge means is irradiated with the first light amount of ultraviolet light from the ultraviolet irradiation means.
- the ultraviolet curable ink landed on the recording medium is temporarily cured.
- the temporarily cured ink is irradiated with the second light quantity of ultraviolet light from the ultraviolet irradiation means.
- the temporarily cured ink is fully cured. In this way, by temporarily moving the ultraviolet irradiation means or the recording medium in the scanning direction, both the temporary curing and the main curing of the ink can be performed, so that the ink can be cured more efficiently.
- the light quantity is proportional to the light intensity
- the light quantity of the ultraviolet light irradiated from the ultraviolet irradiation means can be easily changed by changing the light intensity of the ultraviolet light irradiated from the ultraviolet irradiation means.
- An ink set according to the present invention is an ink set including a plurality of inks ejected from an ink jet printing apparatus, and includes a color UV ink containing an ultraviolet curable resin and a colorant and no metal particles, an ultraviolet curable resin, And a solvent UV ink containing a solvent and metal particles.
- the solvent in the ink is removed after the solvent UV ink containing metal particles provided in the ink set used for printing has landed on the recording medium.
- the pattern height is lowered by the amount of solvent removed. Therefore, the metal particles can be easily oriented substantially parallel to the recording medium in the printing pattern on the recording medium, and the orientation direction is aligned, so that a printing pattern with excellent gloss can be obtained.
- the ink set used for printing also includes color UV ink, it is possible to print not only metallic colors but also other colors.
- metallic color printing patterns are formed with solvent UV ink with excellent gloss
- other color printing patterns are formed with color UV ink with excellent quick drying, so both gloss and quick drying are realized. can do.
- the content of the solvent in the solvent UV ink is preferably 10% by weight or more and 90% by weight or less.
- the printing pattern which a metal particle orientates appropriately is formed. can do.
- An ink jet printing method is an ink jet printing method for printing on a recording medium using the above-described ink set of the present invention, the step of discharging the color UV ink onto the recording medium, And the step of discharging the solvent UV ink, and the step of irradiating the color UV ink and the solvent UV ink discharged on the recording medium with ultraviolet rays.
- the metallic color printing pattern is formed by the solvent UV ink containing the metal particles, the solvent in the ink is removed on the recording medium, and the orientation direction of the metal particles is aligned in the printing pattern.
- a printed pattern with excellent gloss can be obtained.
- the metallic color is formed by the solvent UV ink, and the printing patterns of the other colors are formed by the color UV ink having excellent quick-drying properties.
- the print pattern can be suitably fixed on the recording medium.
- the ink jet printing method according to the present invention further includes a drying step of drying the color UV ink and the solvent UV ink after the ultraviolet irradiation step.
- the printing pattern can be more reliably fixed to the recording medium by further drying the ink irradiated with ultraviolet rays in the ultraviolet irradiation step.
- a metallic color printing pattern is formed by a solvent UV ink having excellent glossiness, and other color printing patterns are formed by a color UV ink having excellent quick drying properties. Furthermore, the ink can be efficiently cured by performing both the temporary curing and the main curing of the ink.
- the metallic color printing pattern is formed by the solvent UV ink having excellent glossiness, and the printing pattern of the other colors is formed by the color UV ink having excellent quick drying property. It is possible to provide an excellent ink set.
- FIGS. 1 and 2 the same or corresponding parts are denoted by the same reference numerals.
- FIG. 1 is a schematic diagram illustrating an ink jet printing apparatus according to an embodiment of the present invention.
- the inkjet printing apparatus 1 ejects ink from an ink set including color UV ink and metallic color solvent UV ink onto a recording medium 3 conveyed on a platen 2, thereby generating an image. And characters are printed on the recording medium 3.
- the inkjet printing apparatus 1 is provided with a conveyance roller (not shown) for conveying the recording medium 3 placed on the platen 2.
- the ink jet printing apparatus 1 is provided with a guide rail 5 that extends in a direction (arrow A direction) perpendicular to the conveyance direction of the recording medium 3 above the platen 2 (upward in FIG. 2).
- the guide rail 5 includes an inkjet head unit (ejection means) 6 for ejecting UV (Ultra Violet) ink, and a UVLED (Ultra Violet Emitting Diode) unit (ultraviolet irradiation means) 7 for irradiating ultraviolet rays.
- the rail 5 is held movably in the extending direction.
- the inkjet head unit 6 is provided with inkjet heads 11a to 11d for discharging color Y inks of yellow Y (Yellow), magenta M (Magenta), cyan C (Cyan) and black K (Black) toward the platen 2 side.
- an inkjet head 11e that discharges metallic UV S solvent UV ink toward the platen 2 is provided.
- Each of the inkjet heads 11a to 11e is connected to an ink tank (not shown) that stores ink of each color.
- ink of each color can be ejected from the inkjet heads 11a to 11e. That is, yellow Y UV ink is ejected from the inkjet head 11a, magenta M UV ink is ejected from the inkjet head 11b, cyan C UV ink is ejected from the inkjet head 11c, and black ink is ejected from the inkjet head 11d.
- the K UV ink is discharged, and the metallic color S solvent UV ink is discharged from the inkjet head 11e.
- the ink jet heads 11a to 11e are linearly arranged along the scanning direction A (arrow A direction), and the ink jet head unit 6 is moved in the scanning direction A (in FIGS. 1 and 2) by a drive unit (not shown). It can move in the left direction) and in the reverse direction of the scanning direction A (right direction in FIGS. 1 and 2). For this reason, when the inkjet head unit 6 moves in the scanning direction A, it is possible to eject five colors of UV ink on one line.
- the movement of the inkjet head unit 6 is realized, for example, by rotating a conveyance belt connected to the inkjet head unit 6 with a motor or the like. Note that the rear end of the guide rail 5 in the scanning direction A (the right end in FIGS. 1 and 2) is the standby position of the inkjet head unit 6.
- the inkjet head unit 6 ejects color UV ink of each color from the inkjet heads 11a to 11d to the recording medium 3, and ejects solvent UV ink containing metal particles from the inkjet head 11e to the recording medium 3.
- Metallic color printing pattern is formed with solvent UV ink containing metal particles, so the solvent in solvent UV ink is removed on the recording medium, and the orientation direction of metal particles is aligned in the printing pattern, resulting in excellent gloss. A printed pattern is obtained.
- UVLED unit 7 The UVLED unit 7 is disposed behind the inkjet head unit 6 in the scanning direction A.
- the UVLED unit 7 can be moved in the scanning direction A and in the direction opposite to the scanning direction A so as to synchronize with the inkjet head unit 6 by a driving unit (not shown). That is, when the UVLED unit 7 moves in the scanning direction A, the UVLED unit 7 moves backward in the traveling direction of the inkjet head unit 6, and when moving in the direction opposite to the scanning direction A, the UVLED unit 7 moves forward in the traveling direction of the inkjet head unit 6. To do.
- the movement of the UVLED unit 7 can be realized, for example, by rotating the transport belt connected to the UVLED unit 7 with a motor or the like, like the inkjet head unit 6.
- the UVLED unit 7 is provided with a UVLED (not shown) for irradiating ultraviolet rays and a condenser lens (not shown).
- a condensing lens is a lens which condenses the ultraviolet-ray irradiated from UVLED. That is, the condensing lens is disposed so as to condense the ultraviolet light irradiated from the UVLED onto the ink that has landed on the recording medium 3.
- the UVLED unit 7 irradiates the color UV ink and the solvent UV ink discharged on the recording medium 3 with ultraviolet rays.
- the ink jet printing apparatus 1 only the metallic color printing pattern is formed by the solvent UV ink, and the printing patterns of other colors are formed by the color UV ink excellent in quick drying. There is no need to perform a drying process. Therefore, the print pattern can be quickly fixed to the recording medium 3 by irradiating the UVLED unit 7 with ultraviolet rays immediately after the ink is ejected from the inkjet head unit 6.
- Control unit 8 The ink jet printing apparatus 1 is provided with a control unit (light quantity changing means) 8 for controlling the transport roller, the ink jet head unit 6 and the UVLED unit 7.
- the controller 8 controls the transport roller, the inkjet head unit 6 and the UVLED unit 7 by transmitting electrical signals to the transport roller, the inkjet head unit 6 and the UVLED unit 7 and the like.
- the control unit 8 is mainly configured by a computer including a CPU (Central processing unit), a ROM (read-only memory), and a RAM (random-access memory), for example.
- the control unit 8 controls the driving of the transport roller and transports the recording medium 3 on the platen 2 in the transport direction. In addition, the control unit 8 performs drive control of the inkjet head unit 6 and moves the inkjet head unit 6 in the scanning direction A or in the direction opposite to the scanning direction A. Further, the control unit 8 controls the ejection of the inkjet heads 11a to 11e, and ejects ink of each color from the inkjet heads 11a to 11e. In addition, the control unit 8 performs drive control of the UVLED unit 7 so as to be synchronized with the inkjet head unit 6, and moves the UVLED unit 7 in the scanning direction A and in the direction opposite to the scanning direction A.
- control unit 8 controls the UVLED unit 7 to irradiate ultraviolet rays, and irradiates the UVLED units 7 with ultraviolet rays. Further, the control unit 8 adjusts the amount of ultraviolet light emitted from the UVLED unit 7 to temporarily cure the ink, and then finally cures the temporarily cured ink. And the control part 8 adjusts the light quantity of an ultraviolet-ray by changing the light intensity of the ultraviolet-ray irradiated from the UVLED unit 7.
- FIG. The light intensity of the ultraviolet light can be changed by adjusting the current flowing through the UVLED unit 7. When a direct current is passed through the UVLED unit 7, the light intensity can be changed depending on the magnitude of the current value. When a pulse current is passed through the UVLED unit 7, the light intensity is changed by changing the pulse width or the number of pulses. Can be made.
- the UV ink (monomer) has a property of being cured by polymerization when irradiated with ultraviolet rays.
- the ink before being irradiated with ultraviolet rays (the UV ink immediately after landing on the recording medium 3) is a liquid having a low molecular weight and a low viscosity.
- the ink is irradiated with ultraviolet rays having a light amount of about 20 mJ / cm 2
- the temporarily cured state is, for example, a state in which the solid property is larger than the liquid property.
- the ink is irradiated with ultraviolet rays having a light amount of about 200 mJ / cm 2
- the molecular weight is further increased. This state is a state of full curing.
- the shape when the ink is fully cured is maintained.
- the shape of the ink changes, but the deformation speed becomes slow.
- the ink spreading speed is reduced, and the ink thickness is reduced. That is, ink bleeding is suppressed, and unevenness due to the ink is reduced and leveling is performed.
- the temporary curing and the main curing of the ink are not limited to the above-described forms.
- the UVLED unit 7 emits only the light amount of ultraviolet light for temporarily curing the ink, and is provided downstream in the transport direction of the recording medium 3.
- ultraviolet rays for main-curing the ink may be collectively irradiated to the temporarily-cured ink from the main-curing UV lamp.
- control unit 8 a processing unit (not shown) configured by a CPU or the like centrally manages the control of the transport roller, the inkjet head unit 6, and the UVLED unit 7, whereby the following processing is performed.
- control unit 8 performs drive control of the transport roller, and issues a command to transport the recording medium 3 placed on the platen 2 in the transport direction. Then, the conveyance roller conveys the recording medium 3, and the recording medium 3 is set at the initial printing position (print start position when moving for each pass).
- control unit 8 issues a command so that the inkjet head unit 6 and the UVLED unit 7 move in the scanning direction A at a predetermined speed. That is, the control unit 8 performs drive control of the inkjet head unit 6 and the UVLED unit 7 and issues a command so that the inkjet head unit 6 and the UVLED unit 7 move in synchronization. Then, the inkjet head unit 6 and the UVLED unit 7 move at a predetermined speed in the scanning direction A in synchronization.
- the control unit 8 issues a command for each of the inkjet heads 11a to 11e to eject ink of each color.
- the control unit 8 controls the ejection of the inkjet heads 11a to 11e, and issues a command for the inkjet heads 11a to 11e to eject ink when the inkjet head unit 6 comes to a position where the ink should be ejected.
- each of the inkjet heads 11a to 11e ejects ink of each color at a position where the ink is to be ejected.
- the positions of the ink jet heads 11a to 11e are accurately detected by an encoder.
- the control unit 8 outputs an ink ejection command triggered by reception of the detection data.
- the control unit 8 issues a command to irradiate ultraviolet rays having the first light intensity from the UVLED unit 7. That is, the control unit 8 sets the light intensity of the ultraviolet light emitted from the UVLED unit 7 to the first light intensity to temporarily cure the ink, and issues a command for the UVLED unit 7 to emit the ultraviolet light. Then, the UVLED unit 7 irradiates ultraviolet rays having the first light intensity.
- the first light intensity is a light intensity at which the integrated light amount of the ultraviolet light applied to the ink is 20 mJ / cm 2 when the UVLED unit 7 moves at a predetermined speed.
- the UVLED of the UVLED unit 7 takes a predetermined offset time from turning on (ultraviolet irradiation) until reaching the required output (first light intensity). For this reason, it is desirable that the command by the control unit 8 is performed so that ultraviolet rays are irradiated only to the printable range of the recording medium 3 in consideration of the offset time of the UVLED of the UVLED unit 7.
- the ink when the UV ink (monomer) is irradiated with ultraviolet rays having an integrated light amount of 20 mJ / cm 2 , the ink has a high molecular weight and a high viscosity, and is temporarily cured. That is, when the ink is temporarily cured, the shape of the ink changes, but the deformation speed becomes slow. For this reason, the ink spreads gradually until the main curing, and the ink is gradually leveled.
- control unit 8 issues a command so that the inkjet head unit 6 and the UVLED unit 7 move at a predetermined speed in the direction opposite to the scanning direction A and return to the standby position. That is, the control unit 8 performs drive control of the inkjet head unit 6 and the UVLED unit 7 and issues a command to move in the reverse direction of the scanning direction A until the inkjet head unit 6 and the UVLED unit 7 return to the standby position. Then, the inkjet head unit 6 and the UVLED unit 7 move in the reverse direction of the scanning direction A and return to the standby position.
- the control unit 8 issues a command so that the UVLED unit 7 emits ultraviolet rays having the second light intensity. That is, the control unit 8 sets the light intensity of the ultraviolet light emitted from the UVLED of the UVLED unit 7 to the second light intensity in order to fully cure the UV ink, and the UVLED of the UVLED unit 7 emits the ultraviolet light. The command is issued. Then, the UVLED of the UVLED unit 7 irradiates ultraviolet rays having the second intensity.
- the second light intensity is a light intensity at which the cumulative amount of ultraviolet light applied to the ink is 200 mJ / cm 2 when the UVLED unit 7 moves at a predetermined speed.
- the temporarily cured ink has a higher molecular weight and is finally cured.
- control unit 8 determines whether printing is completed. If it is determined that printing has not been completed, the control unit 8 repeats the above process again. On the other hand, when determining that the printing is completed, the control unit 8 ends the printing process.
- the inkjet printing apparatus when ink is ejected from the inkjet head unit 6 (inkjet heads 11a to 11e), the ink lands on the recording medium 3.
- the UV ink (monomer) that has landed on the recording medium 3 is temporarily cured.
- the temporarily cured UV ink is fully cured.
- the unevenness of the cured ink is reduced and light streaks due to the ink are reduced, so that the print image quality can be improved.
- the end angle of the ink to be overlaid later can be reduced. For this reason, it is possible to prevent the overlapping ink from being bounced off by the recording medium 3 side (lower side) ink and peeled off.
- the UVLED unit 7 can be It can be used for both temporary curing and main curing of the ink, and the cost can be reduced and the ink can be cured efficiently.
- the inkjet printing apparatus 1 since the UVLED unit 7 is arranged behind the inkjet head unit 6 in the scanning direction A, when the UVLED unit 7 moves in the scanning direction A, the inkjet heads 11a to 11e are discharged. The ink is irradiated with ultraviolet rays having a first light quantity from the UVLED unit 7. Thereby, the ink landed on the recording medium 3 is temporarily cured. Thereafter, when the UVLED unit 7 moves in the direction opposite to the scanning direction A, the UVLED unit 7 irradiates the temporarily cured ink with the second light amount of ultraviolet rays. As a result, the temporarily cured ink is fully cured. Thus, by reciprocating the UVLED unit 7 in the scanning direction A, both the temporary curing and the main curing of the UV ink can be performed, so that the UV ink can be cured more efficiently.
- the ink jet printing apparatus 1 by changing the light intensity of the ultraviolet light irradiated from the UVLED unit 7, it is possible to easily change the light quantity of the ultraviolet light irradiated to the ink.
- the ink since the UVLED unit 7 moves at a predetermined speed, the ink can be temporarily cured by irradiating the UVLED unit 7 with ultraviolet light having the first light intensity, and the UVLED unit 7 can move to the second light intensity. By irradiating with ultraviolet rays, the ink can be fully cured.
- the amount of ultraviolet light irradiated from the UVLED unit 7 may be changed by changing the moving speed of the UVLED unit 7 and changing the irradiation time of the ultraviolet light on the ink landed on the recording medium 3.
- the present invention is not limited to the above embodiment.
- the inkjet head unit 6 and the UVLED unit 7 have been described as moving in synchronization, but may be moved asynchronously.
- the inkjet head unit 6 and the UVLED unit 7 were separate bodies and demonstrated as what drives and controls separately, what is the relationship between the inkjet head unit 6 and the UVLED unit 7? Also good.
- the inkjet head unit 6 and the UVLED unit 7 may be connected to each other or may be configured integrally. In this case, the inkjet head unit 6 and the UVLED unit 7 can be moved integrally by one driving means.
- the UVLED unit 7 has been described as being disposed behind the inkjet head unit 6 in the scanning direction A.
- the inkjet head unit 6 and the UVLED unit 7 may have any positional relationship.
- the UVLED unit 17 a is arranged in front of the scanning direction A of the inkjet head unit 6
- the UVLED unit 17 b is arranged behind the scanning direction A of the inkjet head unit 6.
- the UVLED unit may be arranged only in front of the inkjet head unit 6 in the scanning direction A.
- the UVLED unit 17a, and the UVLED unit 17b move in the scanning direction A, the UVLED unit 17a is not irradiated with ultraviolet rays, and the UVLED unit 17b The ink can be temporarily cured by irradiating with an ultraviolet ray having a light amount of 20 mJ / cm 2 .
- the UVLED unit 17a, and the UVLED unit 17b move in the direction opposite to the scanning direction A, each of the UVLED unit 17a and the UVLED unit 17b is irradiated with ultraviolet rays having a light amount of 100 mJ / cm 2.
- the temporarily cured ink can be fully cured.
- the UVLED unit 17a and the UVLED unit 17b are changed from the normal moving speed of 1200 mm / sec to 500 mm / sec.
- an integrated light amount of 200 mJ / cm 2 in total is obtained from the UVLED unit 17a.
- the ink is temporarily cured when irradiated with ultraviolet light having a light amount of 20 mJ / cm 2 , and the ink is fully cured when irradiated with ultraviolet light having a light amount of 200 mJ / cm 2 .
- the amount of ultraviolet light necessary for pre-curing and main curing varies depending on various factors such as ink components, and therefore is set as appropriate. That is, the intensity of ultraviolet rays necessary to cure the ink is determined according to the resin such as monomer or oligomer contained as a binder in the ink. If commercially available products are used as the color UV ink and solvent UV ink, the description in the manual or the like may be followed.
- the UV LED is used as the ultraviolet irradiation means.
- any means may be used as long as it can irradiate ultraviolet rays, such as a UV lamp.
- the UVLED provided in the UVLED unit may be one or plural.
- the inkjet printing apparatus 1 is provided with a conveyance roller to convey the recording medium 3.
- the recording medium 3 may be conveyed by a mechanism other than the conveyance roller.
- the recording medium 3 is transported in the transport direction to move the inkjet head unit 6 and the UVLED unit 7 and the recording medium 3 relatively.
- the present invention includes a flat bed on which the recording medium 3 is placed and fixed, and a mechanism for moving the inkjet head unit 6 and the UVLED unit 7 in the transport direction and in the reverse direction of the transport direction. You may apply to a printing apparatus.
- the ink set used in the inkjet printing apparatus 1 includes a color UV ink that does not include metal particles and a solvent UV ink that includes metal particles.
- the solvent UV ink is an ink containing an ultraviolet curable resin (UV curable resin), an organic solvent, and metal particles, in which metal particles are dispersed in a solution obtained by dissolving an ultraviolet curable resin in an organic solvent. is there.
- Solvent UV ink containing metal particles may be referred to as metallic ink.
- the solvent UV ink may further contain a pigment, a photopolymerization initiator, and a sensitizer.
- the solvent in the ink is removed after the solvent UV ink has landed on the recording medium, the height of the print pattern on the recording medium is lowered by the amount of the solvent removed. Therefore, in the print pattern on the recording medium, the metal particles contained in the ink are easily oriented substantially parallel to the recording medium, and the orientation directions of the metal particles are aligned. As a result, a print pattern with excellent gloss can be obtained.
- the ultraviolet curable resin contained in the solvent UV ink is not limited as long as it is a compound that cures when irradiated with ultraviolet rays.
- Examples of the ultraviolet curable compound include a curable monomer and a curable oligomer that are polymerized by irradiation with ultraviolet rays.
- curable monomer examples include low-viscosity acrylic monomers, vinyl ethers, oxetane monomers, and cycloaliphatic epoxy monomers.
- curable oligomer examples include acrylic oligomers.
- the low-viscosity acrylic monomer is polymerized by radical polymerization to form a cured resin.
- Vinyl ethers are polymerized by cationic polymerization to form a cured resin.
- vinyl ethers include hydroxybutyl vinyl ether, triethylene glycol divinyl ether, cyclohexane dimethanol divinyl ether, propenyl ether of propylene carbonate, dodecyl vinyl ether, cyclohexane dimethanol monovinyl ether, cyclohexane vinyl ether, diethylene glycol divinyl ether, diethylene glycol divinyl ether, 2 -Ethylhexyl vinyl ether, dipropylene glycol divinyl ether, tripropylene glycol divinyl ether, hexanediol divinyl ether, octadecyl vinyl ether, butanediol divinyl ether, isopropyl vinyl ether, allyl vinyl ether, 1,4-butanediol divinyl ether , Nonadiol diviny
- the oxetane monomer is polymerized by cationic polymerization to form a cured resin.
- examples of the oxetane monomer include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis “((3-ethyloxetane-3-yl) methoxy) methyl” benzene, 3-ethyl-3-“(( 3-ethyloxetane-3-yl) methoxy) methyl ”oxetane, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, or 3-ethyl-3- (phenoxymethyl) oxetane.
- the cycloaliphatic epoxy monomer is polymerized by cationic polymerization to form a cured resin.
- examples of the cycloaliphatic epoxy monomer include Celloxide 2000 and Celloxide 3000 manufactured by Daicel Chemical Industries Co., Ltd., CYRACURE UVR-6015, CYRACURE UVR-6028, and CYRACURE UVRACURUVRURUVR-6128C manufactured by Dow Chemical Chemical Co.
- the acrylic oligomer is polymerized by cationic polymerization to form a cured resin.
- examples of the acrylic oligomer include hyperbranched polyester acrylate, polyester acrylate, urethane acrylate, and epoxy acrylate.
- the content of the ultraviolet curable compound contained in the solvent UV ink is preferably 1% by weight or more and 90% by weight or less, and more preferably 5% by weight or more and 60% by weight or less with respect to the entire ink. preferable.
- the solvent UV ink contains an ultraviolet curable resin in the above range, it can be suitably cured by ultraviolet irradiation.
- the organic solvent contained in the solvent UV ink may be any solvent that dissolves the UV curable resin and volatilizes when the solvent UV ink is dried by heating or the like.
- Such an organic solvent is not particularly limited, and examples thereof include hydrocarbon solvents, alcohols, ester solvents, ether solvents, ketone solvents, and glycol derivatives.
- glycol derivatives include propylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl.
- Ether acetate dipropylene glycol monomethyl ether acetate, ethylene glycol monomethyl ether propionate, ethylene glycol monoethyl ether propionate, ethylene glycol monobutyl ether propionate, diethylene glycol monomethyl ether Lopionate, diethylene glycol monoethyl ether propionate, diethylene glycol monobutyl ether propionate, propylene glycol monomethyl ether propionate, dipropylene glycol monomethyl ether propionate, ethylene glycol monomethyl ether butyrate, ethylene glycol monoethyl ether butyrate, ethylene Glycol ethers such as glycol monobutyl ether butyrate, diethylene glycol monomethyl ether butyrate, diethylene glycol monoethyl ether butyrate, diethylene glycol monobutyl ether butyrate, propylene glycol monomethyl ether butyrate, dipropylene glycol monomethyl ether butyrate, glycol ether Ether acetate
- hydrocarbon solvent examples include aromatic hydrocarbon solvents, chlorinated hydrocarbon solvents, alicyclic hydrocarbon solvents, and aliphatic hydrocarbon solvents.
- n-hexane examples include heptane, n-octane, isooctane, cyclohexane, methylcyclohexane, benzene, toluene, o-xylene, m-xylene, p-xylene, and ethylbenzene.
- ester solvents examples include propyl formate, formic acid-n-butyl, formic acid isobutyl, formic acid amyl, ethyl acetate, acetic acid-n-propyl, isopropyl acetate, acetic acid-n-butyl, isobutyl acetate, sec-butyl acetate.
- Acetate-n-amyl isoamyl acetate, methyl isoamyl acetate, dihexyl acetate, methyl propionate, ethyl propionate, n-butyl propionate, methyl butyrate, ethyl butyrate, methyl lactate, ⁇ -butyrolactone, etc. .
- ketone solvent examples include methyl ethyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, methyl isobutyl ketone, diethyl ketone, ethyl n-butyl ketone, di-n-propyl ketone, mesityl oxide and the like. Can be mentioned.
- Each organic solvent described above may be used alone in consideration of the solubility of the penetration inhibitor used, the ejection stability of the ink, and the drying property of the ink on the target recording medium, Two or more solvents having different boiling points may be used in any combination.
- the content of the organic solvent contained in the solvent UV ink is preferably 10% by weight or more and 90% by weight or less, and preferably 40% by weight or more and 80% by weight or less with respect to the entire composition of the solvent UV ink. It is more preferable.
- the content of the solvent in the solvent UV ink is within the above range, when the solvent is removed on the recording medium, a printing pattern having a height in which the metal particles are properly oriented can be formed in the printing pattern. it can.
- Metal particles are added to give the printed pattern a texture that is metallic.
- metal particles what is necessary is just to select suitably according to the use etc. of printed matter, for example, silver, aluminum, etc. are mentioned.
- the shape of the metal particles is not particularly limited, but is preferably flaky or flat. Brightness is further improved by orienting the scaly or flat metal particles so that the surface direction is parallel to the surface direction of the recording medium.
- the content of the metal particles contained in the solvent UV ink is preferably 1% by weight or more and 20% by weight or less, preferably 2% by weight or more and 10% by weight or less based on the entire composition of the solvent UV ink. It is more preferable.
- a metallic color printing pattern can be suitably formed on the recording medium.
- the photopolymerization initiator that can be contained in the solvent UV ink may be any photopolymerization initiator that can efficiently start the polymerization of the UV curable resin when irradiated with ultraviolet rays.
- a known photopolymerization initiator may be used. Can do.
- Examples of such photopolymerization initiators include alkylphenone photopolymerization initiators, thioxanthone photopolymerization initiators, acyl phosphine oxide photopolymerization initiators, and titanocene photopolymerization initiators. These photopolymerization initiators may be contained alone in the ink, or two or more kinds may be mixed and contained in the ink.
- the sensitizer that can be contained in the solvent UV ink is not particularly limited as long as it can efficiently start the reaction of the photopolymerization initiator by ultraviolet rays, and a known sensitizer can be used.
- Examples of such sensitizers include trimethylamine, methyldimethanolamine, triethanolamine, p-diethylaminoacetophenone, ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, N, N-dimethylbenzylamine and the like. Of these amines.
- These sensitizers may be contained alone in the ink, or two or more kinds may be mixed and contained in the ink.
- the solvent UV ink may contain a diluent, an antifoaming agent, a pigment dispersant, a slip agent, a leveling agent, a polymerization inhibitor and the like as necessary, in addition to the additives described above.
- the total content of the photopolymerization initiator and other additives contained in the solvent UV ink is preferably about 10% by weight with respect to the entire ink composition.
- the solvent UV ink may contain a colorant such as a pigment similar to the color UV ink described later.
- the color UV ink is an ultraviolet curable ink that includes an ultraviolet curable resin and a colorant and does not include metal particles.
- the color UV ink containing no metal particles is intended to be a color UV ink containing no metal particles added to the ink for the purpose of forming a metallic color print pattern. That is, the color UV ink that does not contain metal particles is intended to exclude the metal particles contained in the solvent UV ink described above.
- the color UV ink is an ink that is cured by being irradiated with ultraviolet rays, and includes an ultraviolet curable resin such as a monomer or an oligomer that is polymerized by being irradiated with ultraviolet rays as a binder.
- an ultraviolet curable resin such as a monomer or an oligomer that is polymerized by being irradiated with ultraviolet rays as a binder.
- the ultraviolet curable resin that can be contained in the color UV ink the same materials as the ultraviolet curable resin contained in the solvent V ink described above can be suitably used.
- the content of the monomer, oligomer or polymer contained in the color UV ink that starts and cures when irradiated with ultraviolet rays is 60% by weight or more based on the total composition of the color UV ink. It is preferably no more than wt%, more preferably no less than 70 wt% and no more than 90 wt%.
- the color UV ink contains an ultraviolet curable resin in the above range, it can be suitably cured by ultraviolet irradiation.
- Color UV ink is excellent in quick-drying properties, and can be quickly fixed on a recording medium by simply irradiating it with ultraviolet rays without being dried after landing on the recording medium.
- the color UV ink is for forming a print pattern of a desired color other than a metallic color by containing a colorant.
- a colorant for example, yellow (Y), magenta (M), cyan ( A color UV ink set including four color UV inks of C) and black (K) may be used.
- color UV ink conventionally known commercially available products can be suitably used, and examples thereof include LF140, LF-200, LH-100, and LUS-150 manufactured by Mimaki Engineering.
- the colorant contained in the color UV ink is not particularly limited as long as it is insoluble in the ultraviolet curable resin, and various colorants can be employed depending on the purpose.
- Specific examples of the colorant include at least one kind of particles selected from the group consisting of organic pigments, inorganic pigments, oil-soluble dyes, disperse dyes, oxidation dyes, reactive dyes, magnetic particles, silica, ceramics, and carbon black. It is done.
- Examples of the pigment include carbon black and titanium black as black pigments.
- Examples of white pigments include titanium white and organic hollow particles.
- Further examples of color pigments include anthraquinone, phthalocyanine blue, phthalocyanine green, diazo, monoazo, pyranthrone, perylene, heterocyclic yellow, quinacridone, and (thio) indigoid.
- Representative examples of phthalocyanine blue include copper phthalocyanine blue and its derivatives (Pigment Blue 15).
- Representative examples of quinacridone include Pigment Orange 48, Pigment Orange 49, Pigment Red 122, Pigment Red 192, Pigment Red 202, Pigment Red 206, Pigment Red 207, Pigment Red 209, Pigment Violet 19 and Pigment Violet 42.
- anthraquinones include pigment red 43, pigment red 194 (perinone red), pigment red 216 (brominated pyrantrone red) and pigment red 226 (pyrantron red).
- Representative examples of pyrerin include Pigment Red 123 (Bell Million), Pigment Red 149 (Scarlet), Pigment Red 179 (Maroon), Pigment Red 190 (Red), Pigment Violet, Pigment Red 189 (Yellow Shade Red) and Pigment. Includes red 224.
- Representative examples of thioindigoid include Pigment Red 86, Pigment Red 87, Pigment Red 88, Pigment Red 181, Pigment Red 198, Pigment Violet 36 and Pigment Violet 38.
- Representative examples of heterocyclic yellow include pigment yellow 117 and pigment yellow 138. Examples of other suitable pigments can be found in the reference (The Society Color of Index 3rd Edition (The Society of Dyers and Colorists, 1982)).
- an oil-soluble dye and a disperse dye are preferably used from the viewpoint of good adsorption and entrapment.
- the content of the colorant contained in the color UV ink is preferably about 3 wt% or more and 5 wt% or less with respect to the entire ink composition.
- the ink set used in the ink jet printing apparatus 1 includes the color UV ink, it is possible to print not only the metallic color but also other colors.
- metallic color printing patterns are formed with solvent UV inks with excellent glossiness
- other color printing patterns are formed with color UV inks with excellent quick drying properties, so inks with excellent glossiness and quick drying properties. Set can be offered.
- the ink jet printing method according to the present invention is an ink jet printing method for printing on a recording medium using the above-described ink set of the present invention.
- the ink jet printing method according to the present invention includes a step of discharging a color UV ink, a step of discharging a solvent UV ink, and an ultraviolet irradiation step of irradiating the color UV ink and the solvent UV ink with ultraviolet rays.
- a metallic color print pattern is formed with a solvent UV ink containing metal particles. Accordingly, the solvent in the solvent UV ink is removed on the recording medium, and the orientation direction of the metal particles is aligned in the print pattern, so that a print pattern with excellent gloss can be obtained.
- the metallic color is formed by the solvent UV ink, and the printing patterns of the other colors are formed by the color UV ink having excellent quick-drying properties.
- the print pattern can be suitably fixed on the recording medium.
- the inkjet printing apparatus 1 is the inkjet printing apparatus 1 that ejects ink that is cured by being irradiated with ultraviolet rays, and the inkjet head unit 6 that ejects ink contained in the ink set to the recording medium 3.
- the UVLED unit 7 disposed behind the inkjet head unit 6 in the scanning direction is irradiated with ultraviolet rays having a light quantity of 1, and then the temporarily cured ink is used in the return path in which the UVLED unit 7 moves in the reverse direction of the scanning direction.
- the UVLED unit 7 irradiates the UV light of the second light quantity to be fully cured, and the ink set includes a color UV ink that includes an ultraviolet curable resin and a colorant and does not include metal particles, an ultraviolet curable resin, And a solvent UV ink containing a solvent and metal particles.
- the ink jet printing method is an ink jet printing method in which printing is performed with ink that is cured by being irradiated with ultraviolet rays, and an ejection step for ejecting ink contained in the ink set onto the recording medium 3 and scanning by the UVLED unit 7 are performed.
- the amount of ultraviolet light emitted from the UVLED unit 7 is changed in the light intensity of the ultraviolet light emitted from the UVLED unit 7 in the forward path moving in the direction, and the ink ejected in the ejection step and landed on the recording medium 3 is changed.
- the inkjet printing apparatus 1 when ink from the ink set is ejected from the inkjet head unit 6, the ink lands on the recording medium 3. Then, when the UVLED unit 7 irradiates the first amount of ultraviolet light, the ink landed on the recording medium 3 is temporarily cured. Thereafter, when the UVLED unit 7 irradiates the second light amount of ultraviolet rays, the temporarily cured ink is fully cured.
- the ink before the main curing it is possible to suppress ink bleeding and to level the ink. As a result, the unevenness of the cured ink is reduced and light streaks due to the ink are reduced, so that the print image quality can be improved.
- the ink can be temporarily cured and the ink can be fully cured by changing the amount of the ultraviolet light emitted from the UVLED unit 7, so that the UVLED unit 7 is temporarily cured.
- the ink can be shared for the main curing and the main curing of the ink, and the cost can be reduced and the ink can be cured efficiently.
- the UVLED unit 7 when the UVLED unit 7 moves in the scanning direction, the UVLED unit 7 irradiates the ink discharged from the inkjet head unit 6 with the first light amount of ultraviolet rays. Thereby, the ultraviolet curable ink landed on the recording medium 3 is temporarily cured. Thereafter, when the UVLED unit 7 moves in the direction opposite to the scanning direction, the UVLED unit 7 irradiates the temporarily cured ink with the second light amount of ultraviolet rays. As a result, the temporarily cured ink is fully cured. Thus, by reciprocating the UVLED unit 7 or the recording medium 3 in the scanning direction, both the temporary curing and the main curing of the ink can be performed, so that the ink can be cured more efficiently.
- the light quantity is proportional to the light intensity, the light quantity of the ultraviolet light emitted from the UVLED unit 7 can be easily changed by changing the light intensity of the ultraviolet light emitted from the UVLED unit 7.
- An ink set according to the present invention is an ink set including a plurality of inks ejected from an ink jet printing apparatus, and includes a color UV ink containing an ultraviolet curable resin and a colorant and no metal particles, an ultraviolet curable resin, And a solvent UV ink containing a solvent and metal particles.
- the solvent in the ink is removed after the solvent UV ink containing metal particles, which is provided in the ink set used for printing, has landed on the recording medium 3.
- the pattern height is lowered by the amount of solvent removed. Therefore, the metal particles can be easily oriented substantially parallel to the recording medium 3 in the printing pattern on the recording medium 3 and the orientation directions are aligned, so that a printing pattern with excellent gloss can be obtained.
- the ink set used for printing also includes color UV ink, it is possible to print not only metallic colors but also other colors.
- metallic color printing patterns are formed with solvent UV ink with excellent gloss
- other color printing patterns are formed with color UV ink with excellent quick drying, so both gloss and quick drying are realized. can do.
- the content of the solvent in the solvent UV ink is 10% by weight or more and 90% by weight or less.
- printing can also be performed on a print medium with ink contained in the ink set of the present invention by the method described below.
- the inkjet printing method according to the present invention includes a step of discharging a color UV ink, a step of discharging a solvent UV ink, and an ultraviolet irradiation step of irradiating the color UV ink and the solvent UV ink with ultraviolet rays. .
- the discharge process and the ultraviolet irradiation process will be described.
- each ink is ejected from the inkjet head unit 6 shown in FIG.
- the discharge process for discharging the color UV ink the color UV ink of each color is discharged from the inkjet heads 11a to 11d to the recording medium 3.
- the solvent UV ink containing metal particles is ejected from the inkjet head 11e to the recording medium 3.
- the metallic color printing pattern is formed by the solvent UV ink containing metal particles, when the solvent in the solvent UV ink is removed on the recording medium, the orientation direction of the metal particles is aligned in the printing pattern, so that the gloss is obtained. A print pattern with excellent properties can be obtained.
- each ink is ejected while moving the inkjet head unit 6 along the guide rail 5 to form a print pattern on one line, and then the recording medium 3 is moved to the next line. Similarly, a print pattern is formed.
- the recording medium 3 is moved by transport means (not shown).
- the order of performing the ejection process for ejecting the color UV ink and the ejection process for ejecting the solvent UV ink is not particularly limited. That is, any ink may be ejected.
- UV irradiation process In the ultraviolet irradiation process, the UVLED unit 7 shown in FIG. 1 irradiates the color UV ink and the solvent UV ink discharged onto the recording medium 3 with ultraviolet rays. In the ultraviolet irradiation process, a high-pressure mercury lamp such as a metal halide lamp can be used instead of the UVLED lamp of the UVLED unit 7.
- the printing pattern can be quickly fixed to the recording medium 3 by performing the ultraviolet irradiation process immediately after each ejection process.
- the ink can be sufficiently dried without performing the drying step after the ultraviolet irradiation step, but the ink may be further dried by performing a drying step. That is, an inkjet printing method including a drying step after the ultraviolet irradiation step is also included in the category of the present invention.
- the ink in the drying step can be dried by a conventionally known drying method.
- the intensity of the ultraviolet rays irradiated from the UVLED unit 7 may be set as appropriate according to the type of ink.
- the intensity of ultraviolet rays necessary to cure the ink is determined according to the resin such as monomer or oligomer contained as a binder in the ink. If commercially available products are used as the color UV ink and solvent UV ink, the description in a manual or the like may be followed.
- the UVLED unit 7 moves rearward in the traveling direction of the inkjet head unit 6, so that the UVLED unit 7 moves on the ejected ink line. Irradiate ultraviolet rays to cure the ink.
- the UVLED unit 7 moves forward in the traveling direction of the ink-jet head unit 6, so that the UVLED unit 7 emits ultraviolet rays while moving. do not do.
- the ink line ejected while the inkjet head unit 6 moves in the direction opposite to the arrow A is in the direction indicated by the arrow A when the inkjet head unit 6 ejects ink while moving in the arrow A direction to the adjacent line. It is cured by the ultraviolet rays irradiated from the UVLED unit 7 that moves to. Therefore, the UVLED unit 7 is adjusted in the ultraviolet irradiation range and intensity so as to be able to cure at least the ink discharged to the line immediately below and the adjacent line.
- the UVLED unit 7 moves forward in the direction of travel of the inkjet head unit 6. While moving in the A direction, the UVLED unit 7 does not irradiate ultraviolet rays while moving. While the inkjet head unit 6 is moving in the direction opposite to the arrow A, the UVLED unit 7 irradiates ultraviolet rays while moving, and cures the ink ejected to the line immediately below and the adjacent line. Further, when the UVLED unit 7 is provided both forward and rearward in the direction of arrow A with respect to the inkjet head unit 6, the traveling direction is the same regardless of whether the UVLED unit 7 moves in the direction of arrow A or the opposite direction. It is only necessary to irradiate ultraviolet rays only from the rear UVLED unit 7.
- the inkjet printing method according to the present invention is an inkjet printing method for printing on a recording medium using the above-described ink set of the present invention, and the color UV ink is ejected onto the recording medium 3.
- the ink jet printing method according to the present invention further includes a drying step of drying the color UV ink and the solvent UV ink after the ultraviolet irradiation step.
- the printing pattern can be more reliably fixed to the recording medium 3 by further drying the ink irradiated with the ultraviolet rays in the ultraviolet irradiation step.
- the present invention can be used for inkjet printing technology.
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Abstract
Description
以下、図面を参照して、本発明に係るインクジェット印刷装置の好適な実施形態について詳細に説明する。なお、図1及び2中、同一又は相当部分には同一符号を付すこととする。
インクジェットヘッドユニット6には、イエローY(Yellow)、マゼンダM(Magenta)、シアンC(Cyan)及びブラックK(Black)のカラーUVインクをプラテン2側に向けて吐出するインクジェットヘッド11a~11dが設けられており、さらに、メタリックカラーSのソルベントUVインクをプラテン2側に向けて吐出するインクジェットヘッド11eが設けられている。各インクジェットヘッド11a~11eには、各色のインクを貯留するインクタンク(図示せず)が連結されている。
UVLEDユニット7は、インクジェットヘッドユニット6の走査方向A後方に配置されている。そして、UVLEDユニット7は、図示しない駆動部により、インクジェットヘッドユニット6と同期するように、走査方向A及び走査方向Aの逆方向に移動可能となっている。すなわち、UVLEDユニット7は、走査方向Aに移動する場合は、インクジェットヘッドユニット6の進行方向後方を移動し、走査方向Aの逆方向に移動する場合は、インクジェットヘッドユニット6の進行方向前方を移動する。なお、UVLEDユニット7の移動は、例えば、インクジェットヘッドユニット6と同様に、UVLEDユニット7に連結された搬送ベルトをモータ等で回転させることで実現することができる。
そして、インクジェット印刷装置1には、搬送ローラ、インクジェットヘッドユニット6及びUVLEDユニット7を制御する制御部(光量変更手段)8が設けられている。
インクジェット印刷装置1において使用するインクセットは、インクジェット印刷装置1から吐出されるインクの種類(色数)に応じて複数用意されている。インクジェット印刷装置1において使用するインクセットは、金属粒子を含まないカラーUVインクと、金属粒子を含むソルベントUVインクとを備えている。
ソルベントUVインクは、紫外線硬化型樹脂(UV硬化型樹脂)と有機溶媒と金属粒子とを含むインクであり、紫外線硬化型樹脂が有機溶媒中に溶解した溶解液に、金属粒子が分散したものである。金属粒子を含むソルベントUVインクを、メタリックインクと称することもある。ソルベントUVインクは、さらに、顔料、光重合開始剤、及び、増感剤を含んでいてもよい。
ソルベントUVインクに含まれる紫外線硬化型樹脂は、紫外線を照射した際に硬化する化合物であれば限定されない。紫外線硬化型化合物としては、例えば、紫外線の照射により重合する硬化型モノマー及び硬化型オリゴマーが挙げられる。
ソルベントUVインクに含まれる有機溶媒としては、UV硬化型樹脂を溶解するものであり、ソルベントUVインクを加熱等により乾燥させることによって揮発するものであればよい。このような有機溶媒としては、特に限定されないが、例えば、炭化水素系溶剤、アルコール類、エステル系溶剤、エーテル系溶剤、ケトン系溶剤、グリコール誘導体が挙げられる。
金属粒子は、印刷パターンに金属であるような質感を与えるために加えるものである。金属の種類としては、印刷物の用途等に応じて適宜選択すればよく、例えば、銀、アルミ等が挙げられる。
ソルベントUVインクに含有させることができる光重合開始剤としては、紫外線が照射されることによって、UV硬化型樹脂の重合を効率よく開始させるものであればよく、公知の光重合開始剤を用いることができる。このような光重合開始剤として、例えば、アルキルフェノン系光重合開始剤、チオキサントン系光重合開始剤、アシルフォスフィンオキサイド系光重合開始剤、チタノセン系光重合開始剤等が挙げられる。これらの光重合開始剤は、単独でインクに含有させてもよいし、2種以上を混合してインクに含有させてもよい。
ソルベントUVインクに含有させることができる増感剤としては、光重合開始剤の紫外線による反応を効率よく開始させることが可能なものであればよく、公知の増感剤を用いることができる。このような増感剤として、例えば、トリメチルアミン、メチルジメタノールアミン、トリエタノールアミン、p-ジエチルアミノアセトフェノン、p-ジメチルアミノ安息香酸エチル、p-ジメチルアミノ安息香酸イソアミル、N,N-ジメチルベンジルアミン等のアミン類が挙げられる。これらの増感剤は、単独でインクに含有させてもよいし、2種以上を混合してインクに含有させてもよい。
ソルベントUVインクは、上述した添加剤以外にも、必要に応じて、希釈剤、消泡剤、顔料分散剤、スリップ剤、レベリング剤、重合禁止剤等を含んでいてもよい。ソルベントUVインクに含まれる光重合開始剤とその他の添加剤との総含有量は、インク組成物全体に対して、10重量%程度であることが好ましい。
また、ソルベントUVインクは、後述するカラーUVインクと同様の顔料などの着色剤を含んでいてもよい。
カラーUVインクは、紫外線硬化型樹脂及び着色剤を含み、金属粒子を含まない、紫外線硬化型インクである。金属粒子を含まないカラーUVインクとは、メタリックカラーの印刷パターンを形成する目的でインクに添加される金属粒子を含まないカラーUVインクを意図している。すなわち、金属粒子を含まないカラーUVインクとは、上述したソルベントUVインクに含まれる金属粒子を含まないことを意図している。
カラーUVインクに含有させる着色剤としては、紫外線硬化型樹脂に溶けないものであれば特に限定されず、目的に応じて様々な着色剤を採用することができる。具体的な着色剤としては、例えば、有機顔料、無機顔料、油溶性染料、分散染料、酸化染料、反応染料、磁性粒子、シリカ、セラミック及びカーボンブラックよりなる群から選ばれる少なくとも一種の粒子が挙げられる。
本発明に係るインクジェット印刷方法は、上述した本発明のインクセットを用いて記録媒体に印刷するインクジェット印刷方法である。本発明に係るインクジェット印刷方法は、カラーUVインクを吐出する工程と、ソルベントUVインクを吐出する工程と、カラーUVインク及びソルベントUVインクに紫外線を照射する紫外線照射工程とを包含する。
本発明に係るインクジェット印刷方法は、上述したとおり、カラーUVインクを吐出する工程と、ソルベントUVインクを吐出する工程と、カラーUVインク及びソルベントUVインクに紫外線を照射する紫外線照射工程とを包含する。以下、吐出工程と、紫外線照射工程について説明する。
カラーUVインクを吐出する吐出工程、及び、ソルベントUVインクを吐出する吐出工程においては、図1に示すインクジェットヘッドユニット6から、記録媒体3に対して各インクを吐出する。カラーUVインクを吐出する吐出工程においては、インクジェットヘッド11a~11dから記録媒体3に対して、各色のカラーUVインクを吐出する。ソルベントUVインクを吐出する吐出工程にいては、インクジェットヘッド11eから記録媒体3に対して、金属粒子を含むソルベントUVインクを吐出する。金属粒子を含むソルベントUVインクによりメタリックカラーの印刷パターンを形成するので、記録媒体上においてソルベントUVインク中の溶剤が除去されたときに、印刷パターン中において金属粒子の配向方向が揃うことにより、光沢性に優れた印刷パターンが得られる。
紫外線照射工程においては、図1に示すUVLEDユニット7から、記録媒体3上に吐出されたカラーUVインク及びソルベントUVインクに紫外線を照射する。なお、紫外線照射工程においては、UVLEDユニット7のUVLEDランプの替わりに、メタルハライドランプ等の高圧水銀ランプを用いることもできる。
2 プラテン
3 記録媒体
5 ガイドレール
6 インクジェットヘッドユニット(吐出手段)
7 UVLEDユニット(紫外線照射手段)
8 制御部(光量変更手段)
10 インクジェット印刷装置
11a~11e インクジェットヘッド
17a、17b UVLEDユニット
Claims (6)
- インクジェット印刷装置から吐出されるインクを複数種類備えるインクセットであって、
紫外線硬化型樹脂及び着色剤を含み、金属粒子を含まないカラーUVインクと、
紫外線硬化型樹脂、溶媒及び金属粒子を含むソルベントUVインクと、
を備えていることを特徴とするインクセット。 - 上記ソルベントUVインク中の上記溶媒の含有量は、10重量%以上、90重量%以下であることを特徴とする請求項1に記載のインクセット。
- 請求項1に記載のインクセットを用いて記録媒体に印刷するインクジェット印刷方法であって、
上記記録媒体上に上記カラーUVインクを吐出する工程と、
上記記録媒体上に上記ソルベントUVインクを吐出する工程と、
上記記録媒体上に吐出された上記カラーUVインク及び上記ソルベントUVインクに紫外線を照射する紫外線照射工程と、
を包含することを特徴とするインクジェット印刷方法。 - 上記紫外線照射工程の後に、上記カラーUVインク及び上記ソルベントUVインクを乾燥させる乾燥工程をさらに包含することを特徴とする請求項3に記載のインクジェット印刷方法。
- 紫外線が照射されることにより硬化するインクにより印刷を行うインクジェット印刷方法であって、
インクセットに含まれるインクを記録媒体に吐出する吐出工程と、
紫外線照射手段が走査方向に移動する往路において、紫外線照射手段から照射される紫外線の光量を、前記紫外線照射手段から照射される紫外線の光強度を変更することで、前記吐出工程において吐出され前記記録媒体に着弾した前記インクを仮硬化させる第1の光量に設定して、前記吐出工程において吐出され前記記録媒体に着弾した前記インクに前記紫外線照射手段から紫外線を照射する第1の紫外線照射工程と、
前記第1の紫外線照射工程の後、前記紫外線照射手段が走査方向の逆方向に移動する復路において、前記紫外線照射手段から照射される紫外線の光量を、前記紫外線照射手段から照射される紫外線の光強度を変更することで、前記第1の紫外線照射工程により仮硬化された前記インクを本硬化させる第2の光量に設定して、前記第1の紫外線照射工程において仮硬化された前記インクに前記紫外線照射手段から紫外線を照射する第2の紫外線照射工程と、
を備え、
前記インクセットは、請求項1に記載のインクセットであることを特徴とするインクジェット印刷方法。 - 紫外線が照射されることにより硬化するインクを吐出するインクジェット印刷装置であって、
インクセットに含まれるインクを記録媒体に吐出する吐出手段と、
前記吐出手段から吐出され前記記録媒体に着弾した前記インクに紫外線を照射する紫外線照射手段と、
前記紫外線照射手段から照射される紫外線の光強度を変更することで、前記紫外線照射手段から前記インクに照射される紫外線の光量を変更する光量変更手段と、
を備え、
前記光量変更手段は、前記紫外線照射手段が走査方向に移動する往路において、当該往路において前記吐出手段から吐出され前記記録媒体に着弾した前記インクを仮硬化させる第1の光量の紫外線を前記吐出手段の走査方向後方に配置された前記紫外線照射手段から照射させ、その後、前記紫外線照射手段が走査方向の逆方向に移動する復路において、前記仮硬化された前記インクを本硬化させる第2の光量の紫外線を前記紫外線照射手段から照射させるものであり、
前記インクセットは、請求項1に記載のインクセットであることを特徴とするインクジェット印刷装置。
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JP2012102294A (ja) * | 2010-11-12 | 2012-05-31 | Seiko Epson Corp | 紫外線硬化型インクジェット用インク組成物 |
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JP2009208227A (ja) * | 2008-02-29 | 2009-09-17 | Mimaki Engineering Co Ltd | インクジェットプリンタ及び印刷方法 |
JP2012102294A (ja) * | 2010-11-12 | 2012-05-31 | Seiko Epson Corp | 紫外線硬化型インクジェット用インク組成物 |
JP2012193261A (ja) * | 2011-03-16 | 2012-10-11 | Seiko Epson Corp | インクセット、記録物の製造方法および記録物 |
JP2012206367A (ja) * | 2011-03-29 | 2012-10-25 | Seiko Epson Corp | インクジェット描画方法および記録物 |
JP2012206363A (ja) * | 2011-03-29 | 2012-10-25 | Seiko Epson Corp | 記録物の製造方法および記録物 |
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US10040298B2 (en) | 2018-08-07 |
CN106459636A (zh) | 2017-02-22 |
US20170088736A1 (en) | 2017-03-30 |
EP3144358B1 (en) | 2020-07-15 |
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JP6693870B2 (ja) | 2020-05-13 |
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