WO2013047818A1 - 印刷方法およびインクジェット吐出装置 - Google Patents
印刷方法およびインクジェット吐出装置 Download PDFInfo
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- WO2013047818A1 WO2013047818A1 PCT/JP2012/075213 JP2012075213W WO2013047818A1 WO 2013047818 A1 WO2013047818 A1 WO 2013047818A1 JP 2012075213 W JP2012075213 W JP 2012075213W WO 2013047818 A1 WO2013047818 A1 WO 2013047818A1
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- ink
- transfer
- transfer medium
- printing
- latex ink
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
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- 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
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0022—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0024—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using conduction means, e.g. by using a heated platen
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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
- B41J2/0057—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 where an intermediate transfer member receives the ink before transferring it on the printing material
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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
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- 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
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/0256—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet the transferable ink pattern being obtained by means of a computer driven printer, e.g. an ink jet or laser printer, or by electrographic means
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- 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
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/03—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by pressure
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- 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
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/382—Contact thermal transfer or sublimation processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
- B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
- B44C1/17—Dry transfer
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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
- B41J2002/012—Ink jet with intermediate transfer member
Definitions
- the present invention relates to a printing method and an inkjet discharge apparatus, and more particularly to a printing method by transfer and an inkjet discharge apparatus used in the printing method.
- a transfer printing method in which a pattern printed in advance on the surface of a medium such as a film sheet is transferred to the product surface.
- a first step of printing a UV ink image on a flat original plate by inkjet using UV ink, and irradiation with UV or electron beam while printing the UV ink image or immediately after printing The second step of making the UV ink image into a semi-dried state, the third step of copying the semi-dried UV ink image onto the surface of the elastic blanket, and printing the UV ink image copied onto the elastic blanket
- a printing method having a fourth step of offset printing on a body and a step of drying and fixing an offset-printed UV ink image is known (see Patent Document 1).
- Patent Document 1 when the technique exemplified in Patent Document 1 performs printing by multipass, the amount of UV light irradiation is greater in the printing part where the printing order is earlier. For this reason, the degree of curing of the UV ink printed for each pass differs, and the variation in the ink transfer characteristics increases. Therefore, it was found that a stable and high-quality printing result cannot be obtained.
- Patent Document 1 requires two transfer steps: transfer from the original plate to the elastic blanket and transfer from the elastic blanket to the printing medium. In this case, there is a problem that it is complicated because it is necessary to clean the plate for each transfer as well as there are many steps.
- the present invention has been made in view of the above problems, and an object thereof is to provide a printing method capable of obtaining a high-quality transfer image by a simple process.
- the disclosed printing method includes: an application step of applying latex ink onto a transfer medium to form an ink application surface; a heating step of heating the transfer medium to increase the viscosity of the latex ink;
- the method comprises a transfer step of transferring the latex ink onto the printing object by bringing the latex ink into contact with the printing object, and a drying step of drying the latex ink on the printing object.
- a high-quality transfer image can be formed without causing variation in the degree of curing unlike UV ink and without ink bleeding. can do.
- the transfer image can be transferred from the transfer medium to the printing object in a state where the image is semi-dried and transfer performance is good.
- the latex ink has thermoplasticity after the heating step, and the transfer step prints the latex ink on the transfer medium while heating the transfer medium. It is preferable to transfer onto the object to be printed by contacting the object. According to this, stable transfer performance can be obtained by carrying out transfer while heating the transfer medium, that is, the latex ink on the transfer medium.
- the application step and the heating step are simultaneously performed by applying the latex ink onto the transfer medium while heating the transfer medium. According to this, since the transfer medium is heated, the latex ink is immediately heated at the time of landing, and the solvent and moisture are evaporated to increase the viscosity of the latex ink, so that the ink that has landed is semi-dried before spreading. be able to.
- the viscosity of the latex ink thickened by the heating step is preferably 100 mPa ⁇ sec to 200000 mPa ⁇ sec at 25 ° C. According to this, by increasing the viscosity of the latex ink within the range, it is possible to obtain a high-quality image without bleeding of the latex ink at the time of transfer, and good transfer performance is obtained because it is semi-dry. be able to.
- the transfer step includes pressing the transfer medium having the ink application surface facing the printing object with a pressing member from the opposite side to the ink application surface. It is preferable that the latex ink on the transfer medium is transferred onto the printing object by bringing the ink into close contact with the printing object. According to this, even if the printing object is three-dimensional, the transfer medium is pressed against the object to be printed by using the pressing member from the opposite side of the surface to which the latex ink is applied. A good transfer image can be obtained by deforming along the print object and closely contacting the print object.
- the transfer medium in the transfer step, can be attached as an outer wall portion or can be attached to the inside of the outer wall portion, and the outer wall portion can be deformed or moved in accordance with a change in internal volume, and A casing capable of being kept airtight with the transfer medium attached is prepared, the printing object is stored inside the casing, and the transfer medium is placed with the ink application surface facing the printing object.
- the outer wall portion of the housing or attached to the inside of the outer wall portion by depressurizing the inside of the housing, the outer wall portion is deformed or moved inward of the housing so that the inner volume of the housing is reduced.
- the latex ink on the transfer medium is preferably transferred onto the print object by bringing the ink application surface of the transfer medium into close contact with the print object.
- the transfer medium is deformed along the printing object and closely contacts the printing object, so that the image on the transfer medium is printed. Can be transferred to an object. When pressed with a pad, it can be transferred only to a part of the printing object, but can be transferred to the whole printing object by evacuating the casing.
- An inkjet discharge device of the disclosure is an inkjet discharge device used in the printing method, and includes an inkjet head that ejects the latex ink as inkjet droplets onto the transfer medium, a heater that heats the transfer medium, And a controller for controlling the temperature of the heater. According to this, it is possible to form the ink application surface at a high speed by printing by jetting latex ink as an ink jet droplet, that is, to increase the speed of the application process. In addition, the temperature of the heater can be controlled to bring the latex ink into a desired cured state (temporarily cured state or fully cured state).
- a high-quality transfer image can be obtained by a simple process.
- FIG. 2 is a side view (schematic diagram) of the inkjet discharge apparatus of FIG. 1.
- 3A to 3E are explanatory views for explaining the printing method according to the first embodiment of the present invention.
- 4A to 4E are explanatory views for explaining a printing method according to the second embodiment of the present invention.
- the printing method includes an application process in which latex ink is applied with a pattern desired to be transferred onto a transfer medium (that is, in an area to be transferred) to form an ink application surface (surface on which the ink is applied), and a transfer medium.
- a heating process for increasing the viscosity of the latex ink a transfer process for transferring the latex ink on the transfer medium onto the printing object by contacting the printing object, and a latex ink on the printing object.
- a drying step for drying for drying.
- the ink according to this embodiment includes an emulsion (emulsion) or suspension (suspension) type ink (hereinafter collectively referred to as a dispersion of a thermoplastic resin and a coloring material added as necessary in water and a solvent. "Latex ink”).
- a dispersion of a thermoplastic resin and a coloring material added as necessary in water and a solvent “Latex ink”
- preservative as needed.
- examples of the latex ink include acrylic emulsion latex, urethane emulsion latex, SBR (Styrene Butadiene Rubber) latex, and the like.
- the coloring material include dyes, pigments, and fine particles suspended or dissolved in water or a solvent.
- examples of the solvent include organic solvents containing glycol ethers as a main component.
- the glycol ethers include, for example, di- or triethylene glycol monobutyl ether; propylene glycol monobutyl ether, monoethyl ether, monopropyl ether, or monomethyl ether; dipropylene glycol monobutyl ether; diethylene glycol monohexyl.
- examples include ethers such as ethers, and mixtures thereof, and preferably at least one selected from diethylene glycol diethyl ether, dipropylene glycol monomethyl ether, and triethylene glycol monomethyl ether.
- the lactone solvent is a compound having a cyclic structure based on an ester bond, and includes a 5-membered ring structure ⁇ -lactone, a 6-membered ring structure ⁇ -lactone, a 7-membered ring structure ⁇ -lactone, and the like.
- the viscosity of the latex ink can be increased by evaporating water and a solvent in a heating process described later.
- an ink jet discharge apparatus can be used in the coating process in which latex ink is coated on a transfer medium to form an ink coating surface.
- FIG. 1 is a plan view (schematic diagram) of an inkjet discharge apparatus 1 according to this embodiment
- FIG. 2 is a side view (schematic diagram) thereof.
- the inkjet discharge apparatus 1 includes a platen (support) 2 that supports a transfer medium (here, transfer sheet) 10 to which latex ink is applied, and a plurality of inks on the surface of the transfer sheet 10 if it moves in the X direction.
- An ink jet head 12 that ejects ink droplets from a discharge port and a control unit (not shown) that controls the operation of each unit are provided.
- the inkjet head 12 has a structure in which inkjet droplets are ejected from nozzles (not shown) arranged side by side by a piezo method or the like. As a result, the vehicle can travel on the guide rail 3 in the X direction.
- the traveling means is composed of an electric motor and an electronic circuit. However, it is not limited to the above configuration.
- the inkjet discharge apparatus 1 includes a heater as a heating unit that heats the transfer sheet 10 and heats the inkjet droplets ejected onto the transfer sheet 10.
- Reference numeral 19 in the figure denotes an upper heater that heats the ink jet droplets landed on the surface of the transfer sheet 10 from the surface side of the transfer sheet 10. As a result, the ink jet droplets can be cured (preliminary curing described later).
- the upper heater 19 is a heating device such as an infrared heater or a warm air heater.
- Reference numeral 13 in the figure denotes a lower heater that heats the ink jet droplets landed on the surface of the transfer sheet 10 from the back side of the transfer sheet 10. As a result, the ink jet droplets can be cured (preliminary curing described later).
- the lower heater 13 is a heating device such as an electric heater, an infrared heater, or an electromagnetic induction (IH) heater, and is disposed inside the platen 2 on the back side of the transfer sheet 10.
- the transfer sheet 10 is supported and fixed by the platen 2 while being mounted on the holder 14, and the inkjet head 13 ejects inkjet droplets (latex ink) while ejecting inkjet droplets (latex ink). Travel from one end to the other in the X direction.
- control unit controls the temperature of the heater so that the latex ink on the transfer sheet 10 is in a desired curing state (a temporary curing state or a main curing state described later).
- the inkjet discharge apparatus 1 it is possible to form an ink application surface on the transfer sheet 10 by printing in which latex ink is jetted as inkjet droplets. That is, first, inkjet droplets (latex ink) are ejected from the inkjet head 12 onto the surface of the transfer sheet 10 supported on the platen (support) 2. Next, the inkjet droplet (latex ink) that has landed on the surface of the transfer sheet 10 is heated by the upper heater 19 and the lower heater 13 (or either one) to bring the inkjet droplet into a desired cured state. Can do.
- a transfer sheet 10 on which a surface to which ink is applied with a desired pattern to be transferred (hereinafter referred to as “ink-applied surface”) is formed.
- ink-applied surface a surface to which ink is applied with a desired pattern to be transferred
- the viscosity of the latex ink one having a viscosity suitable for the purpose may be used.
- 20 [mPa ⁇ sec] is preferable. This is because, if the viscosity is within the range, ejection from the inkjet head 12 can be easily performed.
- the latex ink is heated to increase the viscosity by evaporating water and solvent contained in the latex ink.
- the content of water and solvent with respect to the total amount of latex ink is 20 [wt%] to 95 [wt%] in the state before heating.
- the latex ink is heated to increase the viscosity to a desired viscosity by evaporating a predetermined amount of water and solvent.
- the latex ink is heated to a viscosity of 100 [mPa ⁇ sec] to 200000 [mPa ⁇ sec] at 25 [° C.]. This is because, if the viscosity is within the range, the latex ink is in a liquid or paste form that is highly viscous to the extent that the latex ink does not bleed and has adhesiveness suitable for transfer.
- transfer medium 10 in this embodiment will be described.
- Various transfer sheets 10 can be used depending on the purpose, but it is preferable that the print object 15 is not flat but has elasticity to facilitate transfer when it is a curved surface, etc.
- a material that can be deformed along the shape of the print target surface of the print target 15 and can be in close contact with the print target 15 is more preferable. Furthermore, it should just have heat resistance and can perform inkjet printing.
- silicone rubber is preferably used as an example of the material of the transfer sheet 10.
- silicon rubber fluorine rubber, butyl rubber, chloroprene rubber, urethane rubber, butadiene rubber, neoprene, EPDM rubber, etc.
- a single elastomer elastomer resin, or a composite material combining these can be used. You can select from among them according to your purpose. With such a transfer sheet 10, the transfer process can be easily performed because the transfer can be performed by directly pressing and pressing the ink application surface of the transfer sheet 10 against the printing object 15. .
- the transfer sheet 10 when the transfer sheet 10 is made disposable, it may be a material that does not return to its original shape when the pressure is removed, such as rubber.
- the material whose shape does not return include a thin resin film that can be deformed by expansion and contraction at room temperature or thermoplasticity by heating, such as soft urethane, polyester, and polyethylene.
- the hardness and thickness of the transfer sheet 10 may be appropriately changed depending on the shape of the printing object 15. For example, as the shape of the printing object 15 is more complicated, it is preferable to employ a material having a lower hardness and a thinner film thickness.
- the transfer sheet 10 may be a rubber plate.
- 3A to 3E are diagrams schematically showing a printing method according to the present embodiment.
- latex ink is applied onto a transfer sheet 10 made of silicon rubber or the like on a flat plate using an inkjet head 12.
- an ink application surface on which the latex ink is applied is formed on the transfer sheet 10.
- the transfer sheet 10 is attached to the holder 14 in order to keep the shape flat and improve the operability.
- a heating process is performed in which the latex ink on the transfer sheet 10 is heated using a heater to dry the water and solvent by evaporation.
- the viscosity is adjusted by evaporating water and the solvent to such an extent that the latex ink does not bleed and the adhesiveness to which transfer is possible can be maintained.
- a temporarily cured print image 11 is formed on the transfer sheet 10.
- the state in which the viscosity of the latex ink is increased due to the evaporation of water and the solvent, and the state that has not yet reached the “main curing” described later is referred to as “temporary curing” (also referred to as “semi-dry”). is there).
- the upper heater 19 or the lower heater 13 or both are used as the heater (only the heater 13 is shown in FIG. 3A).
- the heating by the heater is preferably performed at a temperature of 30 [° C.] to 70 [° C.] for a time of 5 [sec] to 5 [min], and more preferably 1 [min] or less. .
- the viscosity of the latex ink may be set to 3 [mPa ⁇ sec] to 20 [mPa ⁇ sec] at 25 [° C.] from the viewpoint of facilitating ejection from the inkjet head 12 in the coating process. Is preferred. Then, for example, the viscosity may be increased from 100 [mPa ⁇ sec] to 200000 [mPa ⁇ sec] at 25 [° C.] by a heating process using a heater. Within this viscosity range, the latex ink is liquid or paste that is highly viscous to the extent that it does not bleed, and has adhesiveness suitable for transfer. Therefore, what is necessary is just to determine the addition ratio of a pigment, the size and addition ratio of a latex particle, the boiling point and addition ratio of a solvent, the addition ratio of water, etc. so that it may become the said viscosity range.
- the coating step and the heating step are performed simultaneously by applying latex ink onto the transfer sheet 10 while heating the transfer sheet 10. According to this, since the transfer sheet 10 is heated, the ink is immediately heated at the time of landing, and the solvent and moisture evaporate to increase the viscosity of the ink. ). In addition, by appropriately increasing the viscosity, it is possible to avoid the phenomenon that the ink spreads during the next transfer and the density is lowered due to bleeding or a decrease in film thickness.
- the transfer sheet 10 is moved between the printing object 15 and the pad 16 as the pressing member.
- the printing object 15 is a simple spherical shape, but is not limited to this, and printing can be performed on printing objects of various shapes.
- a transfer process is performed. More specifically, as shown in FIG. 3C, the pad 16 is pushed in the direction of arrow A, and the surface on which the temporarily cured print image 11 of the transfer sheet 10 (that is, the ink application surface) contacts the print surface of the print object 15. Let them press. Thereby, the temporarily cured print image 11 is transferred onto the printing object 15.
- the latex ink is dried from the surface, and thus a viscosity gradient is generated. That is, the viscosity of the latex ink is higher on the side contacting the transfer sheet 10 than on the ink application surface side. For this reason, the latex ink is suitably transferred to the transfer sheet.
- the soft latex ink is flattened by the pressure during transfer, so that a high gloss image can be obtained.
- the surface of the transfer sheet 10 may be matted.
- the material of the pad 16 is preferably an elastic material, and more preferably a material that uniformly applies pressure to the object to be pressed (the transfer sheet 10 or the printing object 15).
- the material of the pad 16 is preferably an elastic material, and more preferably a material that uniformly applies pressure to the object to be pressed (the transfer sheet 10 or the printing object 15).
- the transfer sheet 10 or the printing object 15 For example, it is conceivable to use soft rubber, hard rubber, sponge, a bag containing liquid, powder, or gas. It is also conceivable to use metal, wood, felt or the like according to the shape, material, etc. of the transfer sheet 10 and the printing object 15.
- the transfer process can be performed at room temperature, but in order to make the transfer conditions more stable, the transfer process may be performed while heating so that the environment in which the transfer is performed becomes a constant temperature. According to this, on the condition that the latex ink having thermoplasticity is used in the temporarily cured state, the latex ink on the transfer sheet 10 (that is, the temporarily cured print image 11) is heated while heating the transfer sheet 10 in the transfer process. Can be stably transferred to the printing object 15. At that time, when the latex ink itself is insufficient in thermoplasticity, it is preferable that 15% by weight or more of the resin component of the ink is composed of a thermoplastic resin.
- a drying process is performed. More specifically, as shown in FIG. 3D, while heating the temporarily cured print image 11 on the print object 15 in the direction of arrow C using the heating unit 17, the heating unit 17 is moved in the direction of arrow B. Move in the direction. As a result, the entire latex ink (that is, the temporarily cured print image 11) transferred onto the printing object 15 is dried and cured. In addition, in order to distinguish the hardening by this drying process from the raise of the viscosity by a heating process, it is called "main hardening.”
- heating means 17 various heating means can be used, and examples thereof include ceramic heaters, tungsten heaters, sheathed wire heaters, far infrared heaters, IH heaters, hot air heaters, and combinations thereof.
- the transfer sheet 10 is cleaned using a cleaning sheet 18 as shown in FIG. 3E.
- the cleaning sheet 18 is slid by wiping the transfer sheet 10 while pressing the pad 16 in the direction of arrow A, so that ink remaining on the transfer sheet 10 and adhering dust are wiped off and cleaned.
- the transfer sheet 10 and the pad 16 may be cleaned using alcohol or the like.
- the printing method according to the present embodiment it is not necessary to produce a printing plate, and a small amount of various types of curved surface printing can be performed in a short time and at a low cost.
- the image by the transfer is sufficient. Misalignment and bleeding due to transfer can be reduced. Therefore, a high-quality transfer image can be obtained with a simple process. Further, since the pad does not touch the latex ink, it does not get dirty and has an advantage that it can be used as it is.
- a method of heating in the heating step until the latex ink (that is, the temporarily cured print image 11) on the transfer sheet 10 is in a fully cured state is also conceivable.
- the latex ink on the transfer sheet 10 that is, the temporarily cured print image 11
- the latex ink on the transfer sheet 10 is heated while heating the transfer sheet 10 in the transfer step, using the latex ink having thermoplasticity in the fully cured state.
- stable transfer performance can be obtained even in the case where it is difficult to make the latex ink on the transfer sheet 10 (that is, the temporarily cured print image 11) in a temporarily cured state in the heating step.
- the printing method according to the second embodiment has the same basic configuration as the printing method according to the first embodiment described above, but has a difference particularly in the transfer process.
- the present embodiment will be described focusing on the difference.
- an application step of applying latex ink using the inkjet head 12 onto the transfer sheet 10 fixed in a flat shape by the holder 14 is performed.
- a heating process is performed in which the latex ink on the transfer sheet 10 is heated by a heater to evaporate water and the solvent, thereby drying. As a result, a temporarily cured print image 11 is formed on the transfer sheet 10.
- the heater the upper heater 19 or the lower heater 13 or both are used (only the heater 13 is shown in FIG. 4A).
- the printing object 15 is stored in a casing (here, a vacuum chamber that can be kept airtight) 21. Further, the orientation of the transfer sheet 10 is adjusted so that the temporarily cured print image 11 is positioned in the vacuum chamber 21, and the opening of the vacuum chamber 21 is covered with the transfer sheet 10. Specifically, the holder 14 is set at the end of the opening. That is, the transfer sheet 10 is attached to the vacuum chamber 21 as an outer wall portion of the vacuum chamber 21. Thereby, the vacuum chamber 21 is sealed.
- the vacuum chamber 21 includes an exhaust port 22.
- the air in the vacuum chamber 21 is extracted from the exhaust port 22 to reduce the pressure in the vacuum chamber 21.
- the transfer sheet 10 bends into the vacuum chamber 21.
- the printing object 15 moves in the direction of the arrow A and comes into close contact with the transfer sheet 10.
- the temporarily cured print image 11 is transferred onto the print object 15.
- a method of fixing the printing object 15 without moving it is also conceivable.
- the transfer sheet 10 can be attached to the inside of the outer wall portion, and the outer wall portion can be deformed or moved in accordance with the change in the internal volume.
- the transfer sheet 10 is attached and can be kept airtight. According to this configuration, when the air in the vacuum chamber 21 is extracted from the exhaust port 22 and the inside of the vacuum chamber 21 is depressurized, the outer wall portion is deformed or moved inward of the vacuum chamber 21. The transfer sheet 10 bends into the vacuum chamber 21.
- the printing object 15 moves in the direction of the arrow A and comes into close contact with the transfer sheet 10. As a result, the temporarily cured print image 11 is transferred onto the print object 15.
- a method of fixing the printing object 15 without moving it is also conceivable.
- a drying process is performed. More specifically, as shown in FIG. 4D, while heating the temporarily cured print image 11 on the print object 15 in the direction of arrow C using the heating unit 17, the heating unit 17 is moved in the direction of arrow B. Move in the direction. As a result, the entire temporarily cured print image 11 on the print object 15 is dried and cured (mainly cured).
- the transfer sheet 10 is cleaned using the cleaning sheet 18 as shown in FIG. 4E.
- the printing method according to the present embodiment it is possible to transfer directly from the transfer sheet 10 to the printing object 15 without using the pad 16. Furthermore, transfer to a printing object having a large area and large unevenness can be easily performed. This is because the use of atmospheric pressure makes it easy to apply pressure uniformly. Further, by adjusting the shape and material of the transfer sheet 10, it is possible to perform transfer over almost the entire peripheral surface of the printing object 15 having a three-dimensional shape such as a spherical shape.
- a modification similar to the modification in the first embodiment described above can be considered. That is, in the heating step, a method of heating until the latex ink (that is, the temporarily cured print image 11) on the transfer sheet 10 is in a state of main curing can be considered. In that case, the latex ink on the transfer sheet 10 (that is, the temporarily cured print image 11) is heated while the transfer sheet 10 is heated in the transfer step, with the requirement that the latex ink having thermoplasticity be used in the fully cured state. Can be stably transferred to the printing object 15. According to this modification, stable transfer performance can be obtained even in the case where it is difficult to make the latex ink on the transfer sheet 10 (that is, the temporarily cured print image 11) in a temporarily cured state in the heating step. There are advantages.
- a latex ink is applied on the transfer sheet 10 to form an ink application surface, a heating process for heating the transfer sheet 10 to increase the viscosity of the latex ink, and a latex on the transfer sheet 10.
- a transfer step of transferring ink onto the printing object 15 by bringing the ink into contact with the printing object 15 and a drying step of drying the latex ink on the printing object 15 are provided. According to this, by using latex ink, it is possible to form an image for transfer on the transfer sheet 10 without forming an ink receiving layer on the transfer sheet 10. Therefore, since the transfer process needs to be performed only once from the transfer sheet 10 to the printing object 15, the process can be simplified.
- the transfer image can be transferred from the transfer sheet 10 to the printing object 15 in a state where the transfer performance is semi-dry and the transfer performance is good.
- the latex ink has thermoplasticity after the heating step, and the transfer step is performed by bringing the latex ink on the transfer sheet 10 into contact with the printing object 15 while heating the transfer sheet 10. It is preferable to transfer onto the printing object 15. According to this, stable transfer performance can be obtained by performing transfer while heating the transfer sheet 10, that is, the latex ink on the transfer sheet 10.
- the coating process and the heating process are simultaneously performed by applying latex ink onto the transfer sheet 10 while heating the transfer sheet 10. According to this, since the transfer sheet 10 is heated, the latex ink is immediately heated at the time of landing, and the latex ink is thickened by evaporating the solvent and moisture, so that the ink that has landed is semi-dried before spreading. Can be made.
- the viscosity of the latex ink thickened by the heating process is preferably 100 mPa ⁇ sec to 200000 mPa ⁇ sec at 25 ° C. According to this, by increasing the viscosity of the latex ink within the range, it is possible to obtain a high-quality image without bleeding of the latex ink at the time of transfer, and good transfer performance is obtained because it is semi-dry. be able to.
- the ink application surface is brought into close contact with the printing object 15 by pressing the transfer sheet 10 arranged with the ink application surface facing the printing object 15 with the pad 16 from the side opposite to the ink application surface.
- the transfer sheet 10 is deformed along the printing object 15 and is in close contact with the printing object 15, a good transfer image can be obtained.
- the transfer sheet 10 can be attached as an outer wall portion or can be attached to the inside of the outer wall portion, and the outer wall portion can be deformed or moved in accordance with a change in the internal volume, and the transfer sheet 10 is attached.
- the vacuum chamber 21 capable of being kept airtight is prepared, and the printing object 15 is stored inside the vacuum chamber 21, the transfer medium is placed on the casing with the ink application surface facing the printing object.
- the outer wall portion or attached to the inner side of the outer wall portion by reducing the pressure inside the vacuum chamber 21, the outer wall portion is deformed or moved inward of the vacuum chamber 21 so as to reduce the inner volume of the vacuum chamber 21,
- the transfer sheet 10 is deformed along the printing object 15 and closely contacts the printing object 15.
- the upper image can be transferred to the printing object 15.
- the inkjet discharge apparatus 1 is an inkjet discharge apparatus used in the printing method described above, and includes an inkjet head 12 that ejects latex ink as inkjet droplets onto the transfer sheet 10, a heater that heats the transfer sheet 10, And a controller for controlling the temperature of the heater. According to this, it is possible to form the ink application surface at a high speed by printing by jetting latex ink as an ink jet droplet, that is, to increase the speed of the application process. In addition, the temperature of the heater can be controlled to bring the latex ink into a desired cured state (temporarily cured state or fully cured state).
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Abstract
Description
より具体的に、ラテックスインクの種類としては、例えば、アクリル系エマルション型ラテックス、ウレタン系エマルション型ラテックス、SBR(Styrene Butadiene Rubber)ラテックス等が挙げられる。また、色材としては、例えば、染料、顔料、または水や溶剤に懸濁もしくは溶解する微粒子等が挙げられる。
さらに、必要に応じて他の有機溶媒、例えば、エチレングリコールモノメチルエーテルアセテート、エチレングリコール-モノエチルエーテルアセテート、ジエチレングリコールモノメチルエーテルアセテート、プロピレングリコールモノメチルエーテルアセテート等のエステル類、ラクトン溶剤等を併用することができる。なお、ラクトン溶剤は、エステル結合による環状構造を持つ化合物であり、5員環構造のγ-ラクトン、6員環構造のδ-ラクトン、7員環構造のε-ラクトン等があり、例えば、γ-ブチロラクトン、γ-バレロラクトン、γ-ヘキサラクトン、γ-ヘプタラクトン、δ-ヘプタラクトン、δ-オクタラクトン、δ-ノナラクトン、δ-デカラクトン、δ-ウンデカラクトン、ε-カプロラクトンおよびそれらの混合物を使用することができる。
このインクジェット吐出装置1は、ラテックスインクが塗布される転写媒体(ここでは転写シート)10を支持するプラテン(支持体)2と、X方向に移動しがなら転写シート10の表面にインクを複数の吐出口から噴射してインクジェット液滴を着弾させるインクジェットヘッド12と、各部の動作を制御する制御部(不図示)とを備えている。
また、図中の符号13は、転写シート10の表面に着弾されたインクジェット液滴を転写シート10の裏面側から加熱する下部ヒータである。これによって、インクジェット液滴を硬化(後述の仮硬化)することができる。一例として、下部ヒータ13には、電熱式ヒータ、赤外線ヒータ、電磁誘導(IH)ヒータ等の加熱装置が用いられ、転写シート10の裏面側となるプラテン2の内部に配置される。
次に、本発明の第一の実施形態に係る印刷方法について説明する。図3A~図3Eは本実施の形態に係る印刷方法を模式的に示す図である。
その際、ラテックスインク自体の熱可塑性が不足する場合には、該インクの樹脂成分のうち15[重量%]以上を熱可塑性樹脂で構成することが好適である。
その場合には、本硬化した状態において熱可塑性を有するラテックスインクを使用することを要件として、転写工程において転写シート10を加熱しながら当該転写シート10上のラテックスインク(すなわち仮硬化プリント画像11)を印刷対象物15に接触させることによって、印刷対象物15への転写を安定して行うことができる。
この変形例によれば、加熱工程において、転写シート10上のラテックスインク(すなわち仮硬化プリント画像11)を仮硬化の状態とすることが難しい場合であっても、安定した転写性能が得られるという利点がある。
次に、本発明の第二の実施形態に係る印刷方法について説明する。
第二の実施形態に係る印刷方法は、前述の第一の実施形態に係る印刷方法と基本的な構成は同様であるが、特に転写工程において相違点を有する。以下、当該相違点を中心に本実施形態について説明する。
その場合には、本硬化した状態において熱可塑性を有するラテックスインクを使用することを要件として、転写工程において転写シート10を加熱しながら当該転写シート10上のラテックスインク(すなわち仮硬化プリント画像11)を印刷対象物15に接触させることによって、印刷対象物15への転写を安定して行うことができる。
この変形例によれば、加熱工程において、転写シート10上のラテックスインク(すなわち仮硬化プリント画像11)を仮硬化の状態とすることが難しい場合であっても、安定した転写性能が得られるという利点がある。
Claims (7)
- ラテックスインクを転写媒体上に塗布してインク塗布面を形成する塗布工程と、
前記転写媒体を加熱して、前記ラテックスインクの粘度を上げる加熱工程と、
前記転写媒体上の前記ラテックスインクを印刷対象物に接触させることで該印刷対象物上に転写する転写工程と、
前記印刷対象物上の前記ラテックスインクを乾燥させる乾燥工程と、を備えること
を特徴とする印刷方法。 - 前記ラテックスインクは、前記加熱工程を実施した後の状態において熱可塑性を有し、
前記転写工程は、前記転写媒体を加熱しながら該転写媒体上の前記ラテックスインクを
印刷対象物に接触させることで該印刷対象物上に転写すること
を特徴とする請求項1記載の印刷方法。 - 前記塗布工程と前記加熱工程とは、前記転写媒体を加熱しながら該転写媒体上に前記ラテックスインクを塗布することによって同時に実施されること
を特徴とする請求項1記載の印刷方法。 - 前記加熱工程によって増粘した前記ラテックスインクの粘度が25℃において100mPa・sec~200000mPa・secであること
を特徴とする請求項1記載の印刷方法。 - 前記転写工程は、前記インク塗布面を前記印刷対象物に向けて配置した前記転写媒体を該インク塗布面とは逆側から押圧部材で押圧することによって、該インク塗布面を前記印刷対象物に密着させることで、該転写媒体上の前記ラテックスインクを該印刷対象物上に転写すること
を特徴とする請求項1記載の印刷方法。 - 前記転写工程は、前記転写媒体を外壁部として取り付け可能もしくは外壁部の内側に取り付け可能であると共に内容積の変化に応じて該外壁部が変形もしくは移動可能であり、且つ該転写媒体が取り付けられた状態で気密保持が可能な筺体を準備し、
前記筺体の内部に、前記印刷対象物を格納し、
前記転写媒体を、前記インク塗布面を前記印刷対象物に向けて前記筺体の外壁部としてもしくは外壁部の内側に取り付けて、
前記筺体の内部を減圧することによって、該筺体の内容積が減少するように前記外壁部を該筺体の内方へ変形もしくは移動させて、前記転写媒体のインク塗布面を前記印刷対象物に密着させることで、該転写媒体上の前記ラテックスインクを該印刷対象物上に転写すること
を特徴とする請求項1記載の印刷方法。 - 請求項1~6のいずれか一項に記載の印刷方法に用いられるインクジェット吐出装置であって、
前記ラテックスインクをインクジェット液滴として前記転写媒体上に噴射するインクジェットヘッドと、該転写媒体を加熱するヒータと、該ヒータの温度を制御する制御部と、を備えること
を特徴とするインクジェット吐出装置。
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EP12836132.6A EP2762320B1 (en) | 2011-09-29 | 2012-09-28 | Printing method and ink-jet ejecting apparatus |
CN201280048321.8A CN103842183B (zh) | 2011-09-29 | 2012-09-28 | 印刷方法以及喷墨喷出装置 |
KR1020147005285A KR20140041919A (ko) | 2011-09-29 | 2012-09-28 | 인쇄방법 및 잉크젯 토출장치 |
US14/241,448 US9481184B2 (en) | 2011-09-29 | 2012-09-28 | Transfer printing method and apparatus |
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JP6185824B2 (ja) * | 2013-11-25 | 2017-08-23 | 株式会社ミマキエンジニアリング | 印刷方法及び印刷装置 |
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US9796191B2 (en) * | 2015-03-20 | 2017-10-24 | Corning Incorporated | Method of inkjet printing decorations on substrates |
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