JP4788295B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an ink jet recording apparatus that performs recording by ejecting ink onto a recording medium such as recording paper or recording cloth.

  As is well known, an ink jet recording apparatus is a recording apparatus that forms an image by ejecting ink droplets onto a flat recording medium such as paper, cloth, or plastic sheet, or a three-dimensional recording medium.

  In general, an ink jet recording apparatus is configured to consume ink for maintenance to maintain the function of a nozzle that ejects ink in addition to ejecting ink for image formation. The ink to be processed is processed as waste ink.

  Regarding the disposal of waste ink, there are various ideas as follows.

  Patent Documents 1 and 2 propose to heat and evaporate waste ink.

  Patent Documents 3 and 4 propose providing a liquid absorber in a waste liquid tank.

Japanese Patent Application Laid-Open No. H10-228688 proposes to solidify the ink by providing a discharge unit that discharges a treatment liquid that solidifies the ink.
JP-A-1-20454 JP-A-1-20455 Japanese Patent Laid-Open No. 4-135865 JP-A-4-344256 JP-A-8-281972

  In the waste ink processing of Patent Documents 1 and 2, there is a problem that the temperature in the recording apparatus rises and the recording ink may be altered, and there is a problem of odor generated during evaporation.

  In the waste ink processing of Patent Documents 3 and 4, since the liquid waste ink is stored in the recording apparatus, there is a problem that the waste ink may leak out. In particular, ink leakage occurs when pressure is applied to the waste ink container or the recording apparatus falls.

  Further, although the absorber that has absorbed the waste ink is treated as a waste, since it becomes a waste treatment of a complex composed of a solid and a liquid, there is a problem that the treatment process becomes complicated.

  In the waste ink processing of Patent Document 5, since an ink discharge mechanism for waste ink processing is added, the structure becomes complicated, and materials for waste ink processing are required, so that the manufacturing cost is increased. There is a problem that the running cost becomes high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording apparatus having a waste ink processing means that can solve the above-described problems in conventional waste ink processing and can be processed with a simple mechanism.

The present invention makes use of the characteristics of ink that is cured by active energy rays such as ultraviolet rays, and allows waste ink to be cured and accommodated in a waste ink container, thereby enabling simple waste ink processing. The object is achieved by any one of the inkjet recording apparatuses.
1.
A carriage configured to support an energy beam source for irradiating an active energy beam and a recording head that discharges ink that is cured by the active energy beam and configured to be capable of reciprocating in a print area;
A maintenance unit having suction means to perform recovery processing of the recording head, arranged outside the print area;
Wherein said print area as viewed in the moving direction of the carriage is disposed between the maintenance unit, a waste ink container for containing waste ink from the aspirated the recording head by the suction means of the maintenance unit,
An ink jet recording apparatus comprising:
The energy ray source is supported by the carriage so as to be disposed on the print area side with respect to the recording head when the carriage is located outside the print area. An ink jet recording apparatus , wherein an active energy ray is irradiated to waste ink stored in the waste ink container at a position facing the waste ink container outside a printing region by movement of a carriage.
2.
The recording head is arranged to face the maintenance unit when the active energy ray is irradiated from the energy ray source to the waste ink stored in the waste ink container. Inkjet recording apparatus.
3.
3. The ink jet recording apparatus according to claim 1, wherein ink discharged by flushing from the recording head disposed opposite to the waste ink container flows down and is collected .
4).
The inkjet recording apparatus according to claim 1, wherein the energy beam source generates ultraviolet rays.
5.
The inkjet recording apparatus according to claim 1, wherein an image is recorded using an ink that is cured in a gel state by irradiation with an active energy ray.

  According to the present invention, since the waste ink is cured with active energy rays and stored in the waste ink container, there is no risk of leakage of the ink in the waste ink container, and also when the waste ink is processed as waste, Since it is a solid treatment, it is suitable for handling such as transportation and storage, and waste disposal becomes easy.

  Hereinafter, the present invention will be described with reference to embodiments, but the present invention is not limited to the embodiments.

  FIG. 1 is a diagram showing an overall configuration of an ink jet recording apparatus according to an embodiment of the present invention.

  Reference numeral 1 denotes an ink tank as a recording ink supply source, which includes a yellow ink tank 1Y, a magenta ink tank 1M, a cyan ink tank 1C, and a black ink tank 1K. Reference numeral 2 denotes a recording head having nozzles that eject ink droplets to form an image, and includes a yellow recording head 2Y, a magenta recording head 2M, a cyan recording head 2C, and a black recording head 2K. An energy ray source 3 emits ultraviolet rays that are active energy rays.

  Reference numeral 4 denotes a carriage. The carriage 4 integrally mounts the recording head 2 and the energy beam source 3, and is reciprocated as indicated by arrows WX 1 and WX 2 guided by the carriage guide 5 to scan the recording medium P. Then, an image is formed on the recording medium P.

  Reference numeral 6 denotes a solenoid valve, which includes a yellow solenoid valve 6Y, a magenta solenoid valve 6M, a cyan solenoid valve 6C, and a black solenoid valve 6K. An intermediate tank 7 includes a yellow intermediate tank 7Y, a magenta intermediate tank 7M, a cyan intermediate tank 7C, and a black intermediate tank 7K.

  The recording ink is sent from the ink tank 1 to the intermediate tank 7 and supplied from the intermediate tank 7 to the recording head 2 through the ink supply path 8. The ink supply path 8 is composed of supply paths for yellow ink, magenta ink, cyan ink, and black ink. Each single color ink is independently supplied from the ink tank 1 via the ink supply path 8 and the recording head. 2 is supplied.

  A maintenance unit 10 performs a recovery process of the recording head 2 and includes a suction cap 9 for capping the recording head 2.

  As shown in FIG. 1, the energy beam source 3 has a print area that is more than the print head 2 relative to the print head 2 when the carriage 4 is at a position outside the print area facing the maintenance unit 10, for example, at an end position. It is provided in the carriage 4 so as to be located on the side. With the arrangement of the energy beam source 3 as described above, the energy beam source 4 is continuously turned on when the carriage 4 is moved from the printing area to the end position, and the ink on the recording medium P is cured and the waste ink container 12 is moved. It becomes possible to cure the waste ink inside (the curing of the ink will be described later).

  The suction cap 9 includes a suction cap 9Y for capping the yellow recording head 2Y, a suction cap 9M for capping the magenta recording head 2M, a suction cap 9C for capping the cyan recording head 2C, and a suction cap 9K for capping the black recording head 2K. The

  A waste ink container 12 for storing waste ink receives and stores ink forcedly ejected from the recording head 2 during flushing. An opening 12A (see FIG. 3) is formed above the waste ink container 12 so as to receive the waste ink. Further, ultraviolet rays are introduced into the waste ink container 12 through the opening 12A. The waste ink container 12 is detachably attached.

  Reference numeral 13 denotes a light guide for introducing ultraviolet rays from the energy ray source 3 into the waste ink container 12, which is made of a plate opaque to the ultraviolet rays and is formed in a cylindrical shape to prevent the ultraviolet rays from leaking outside. The light guide 13 prevents the ink in the vicinity of the waste ink container 12 from being unnecessarily solidified.

  FIG. 2 is a diagram showing the flow of ink, and FIG. 3 is a diagram of the recording head 2, energy beam source 3, suction cap 9, and waste ink container 12 when the carriage 4 is at the end position facing the maintenance unit 10. It is a figure which shows a positional relationship.

  The recording ink in the ink tank 1 is supplied to the intermediate tank 7 via the electromagnetic valve 6. The intermediate tank 7 is provided with an ink amount sensor 14, and the solenoid valve 6 opens and closes based on a detection signal of the ink amount sensor 14 to keep the ink amount in the intermediate tank 7 constant.

  A damper 15 is interposed between the intermediate tank 7 and the recording head 2, and the damper 15 relieves fluctuations in ink pressure in the recording head 2 caused by movement of the carriage 4.

  Waste ink discharged from the recording head 2 during flushing and waste ink sucked from the recording head 2 during recovery processing are stored in a waste ink container 12.

  Reference numeral 16 denotes an electromagnetic valve that alleviates pressure fluctuations in the suction cap 9 that occur when the suction cap 9 is in close contact with or separated from the recording head 2. As shown in FIG. 3, the suction pump 17 includes a yellow suction pump 17Y, a magenta suction pump 17M, a cyan suction pump 17C, and a black suction pump 17K, and operates independently for each single color ink. The ink sucked by these suction pumps 17Y, 17M, 17C, and 17K is stored in a common waste ink container 12.

  In the present invention, ink that is cured by irradiation with an active energy ray such as ultraviolet rays is used. As such an ink, known inks described in US Pat. No. 4,228,438, Japanese Patent Publication No. 5-64667, Japanese Patent Application Laid-Open No. 7-224241, and the like can be used.

  Moreover, it is described in Japanese Patent Application No. 2005-211135 concerning the application of the present applicant, and the ink hardened | cured in a gel form with an active energy ray can be used.

  As a gel-curing ink, at least a colorant, water, and a polymer compound having a plurality of side chains in a hydrophilic main chain and capable of crosslinking between side chains by irradiation with active energy rays Ink-jet inks, wherein the colorant is anionic and the side chain of the polymer compound is anionic or nonionic.

  A polymer compound having a plurality of side chains in the hydrophilic main chain and capable of cross-linking between the side chains by irradiation with active energy rays is a saponified product of polyvinyl acetate, polyvinyl acetal, polyethylene oxide, polyalkylene. For at least one hydrophilic resin selected from the group consisting of oxide, polyvinyl pyrrolidone, polyacrylamide, polyacrylic acid, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, derivatives of the hydrophilic resin, and copolymers thereof In this case, a modifying group such as a photodimerization type, a photodecomposition type, a photopolymerization type, a photomodification type, or a photodepolymerization type is introduced into the side chain. Photopolymerizable crosslinkable groups are desirable from the viewpoints of sensitivity and performance of the generated image.

  There is a preferred combination between the ionicity of the colorant and the ionicity of the side chain of the polymer compound. It was found that by selecting anionic as the color material and combining nonionic or anionic properties in the side chain, the color material is excellent in terms of image fastness, ink storage stability, and continuous emission. The side chain is most preferably nonionic. The reason is not clear, but in the case of the combination of ions, the decomposition of the ink composition and the association of the ink compositions are reduced, which may influence the above effect.

  As a side chain, what has a structure represented by the said general formula (A) is preferable.

  What the partial structure of the hydrophilic principal chain and side chain of an active energy ray crosslinkable polymer compound is represented by the following general formula (A) is preferable.

Formula (A)
_{Poly - {(X 1) m} - [B- (Y _{1) n] p}}
In the formula, Poly represents a hydrophilic main chain. Saponified product of polyvinyl acetate, polyvinyl acetal, polyethylene oxide, polyalkylene oxide, polyvinyl pyrrolidone, polyacrylamide, polyacrylic acid, hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, or a derivative of the hydrophilic resin, and copolymers thereof Is preferred.

{} Represents a side chain. In the side chain, X ₁ represents a (p + 1) -valent linking group. p represents a positive integer, preferably an integer of 1 to 5. Specifically, when p = 1, X ₁ represents a divalent linking group. For example, an alkylene group, an arylene group, a heteroarylene group, an ether group, a thioether group, an imino group, an ester group, an amide group, a sulfonyl group Groups may be mentioned, and these may be combined to form one divalent or higher group. When p = 2 or more, a plurality of B and Y ₁ described later may be the same or different.

X ₁ is preferably an alkylene oxide or a divalent or higher linking group in which an aromatic group is combined at least.

  B represents a crosslinking group. Specifically, it is a group containing a double bond or a triple bond, and represents, for example, an acryl group, a methacryl group, a vinyl group, an allyl group, a diazo group, or an azide group. An acrylic group and a methacryl group are preferable.

Y ₁ represents a hydrogen atom or a substituent. Specifically, the substituent is a halogen atom (for example, fluorine atom, chlorine atom, etc.), an alkyl group (for example, methyl, ethyl, butyl, pentyl, 2-methoxyethyl, trifluoromethyl, 2-ethylhexyl, cyclohexyl, etc.) , Aryl groups (eg, phenyl, p-tolyl, naphthyl, etc.), acyl groups (eg, acetyl, propionyl, benzoyl, etc.), alkoxy groups (eg, methoxy, ethoxy, butoxy, etc.), alkoxycarbonyl groups (eg, methoxycarbonyl) I-propoxycarbonyl etc.), acyloxy group (eg acetyloxy, ethylcarbonyloxy etc.), carbamoyl group (eg methylcarbamoyl, ethylcarbamoyl, butylcarbamoyl, phenylcarbamoyl etc.), sulfamoyl group (eg sulfayl) Yl, methylsulfamoyl, dimethylsulfamoyl, phenylsulfamoyl, etc.), alkylthio groups (eg, methylthio, ethylthio, octylthio, etc.), arylthio groups (eg, phenylthio, p-tolylthio, etc.), alkylureido groups (eg, , Methylureido, ethylureido, methoxyethylureido, dimethylureido, etc.), arylureido groups (eg, phenylureido etc.), alkylsulfonamide groups (eg, methanesulfonamide, ethanesulfonamide, butanesulfonamide, trifluoromethylsulfone) Amide, 2,2,2-trifluoroethylsulfonamide, etc.), arylsulfonamide groups (eg, phenylsulfonamide, tolylsulfonamide, etc.), alkylaminosulfonylamino groups (eg, Methylaminosulfonylamino, ethylaminosulfonylamino, etc.), arylaminosulfonylamino groups (eg, phenylaminosulfonylamino, etc.), hydroxy groups, heterocyclic groups (eg, pyridyl, pyrazolyl, imidazolyl, furyl, thienyl, etc.), etc. In addition, these may have a substituent.

  m represents 0 or 1.

  n represents 0 or 1.

  In the hydrophilic main chain, a saponified product of polyvinyl acetate is preferable from the viewpoint of ease of introduction of side chains and handling, and the degree of polymerization is preferably 300 or more and 4000 or less, and 500 or more and 2000 or less from the viewpoint of handling. preferable. The modification rate of the side chain with respect to the main chain is preferably 0.3 mol% or more and 4 mol% or less, and more preferably 0.5 mol% or more and 1.5 mol% or less from the viewpoint of reactivity. If it is less than 0.3 mol%, the crosslinkability tends to be insufficient, and if it is more than 4 mol%, the crosslink density increases and the film becomes hard even if it is hard, and the strength of the film decreases.

  In the active energy ray crosslinkable polymer compound, as a more preferable structure, a photosensitive resin described in JP-A-56-67309 is represented by the following general formula (1) in a polyvinyl alcohol structure. A side chain of an azido-5-nitrophenylcarbonyloxyethylene structure (nonionic) or a side chain of a 4-azido-3-nitrophenylcarbonyloxyethylene structure (nonionic) represented by the following general formula (2): It is the resin composition which has.

  A side chain of a modifying group (anionic) represented by the following general formula (3) is also preferably used.

  In the formula, R represents an alkylene group or an aromatic ring. A benzene ring is preferred.

  As the photopolymerization type modifying group, for example, a resin (nonionic) represented by the following general formula (4) disclosed in JP-A Nos. 2000-181062 and 2004-189841 is preferable from the viewpoint of reactivity.

In the formula, R ₂ represents Me or H, n represents 1 or 2, X represents — (CH ₂ ) _m —COO— or —O—, Y represents an aromatic ring or a single bond, and m represents 0 to 6 Represents an integer.

  Moreover, it is also preferable to use the photopolymerization type | mold modified group (nonionic property) represented by following General formula (5) described in Unexamined-Japanese-Patent No. 2004-161942 for a conventionally well-known water-soluble resin.

In the formula, R ₃ represents Me or H, and R ₄ represents a linear or branched alkylene group having 2 to 10 carbon atoms.

  Furthermore, modified groups (nonionic) represented by the following general formulas (6) to (8) are also preferably used.

  Such a photo-crosslinking type resin is preferably contained in an amount of 0.8% by mass to 5.0% by mass with respect to the total mass of the ink. The presence of 0.8% by mass or more improves cross-linking efficiency, and beading and color bleeding are more preferable due to a rapid increase in ink viscosity after cross-linking. In the case of 5.0% by mass or less, it is difficult to adversely affect the physical properties of the ink and the state in the ink head, which is preferable from the viewpoints of light emission properties and ink storage stability.

  In the photo-crosslinking type resin, the active energy ray-curing type that polymerizes through a general chain reaction because the main chain originally has a certain degree of polymerization is crosslinked via a cross-linking between side chains. The effect of increasing the molecular weight per photon is significantly larger than that of the resin. On the other hand, in the conventionally known active energy ray curable resins, the number of crosslinking points cannot be controlled, so the physical properties of the cured film cannot be controlled, and the film tends to be hard and brittle.

  In the active energy ray-crosslinking type resin, the number of crosslinking points can be completely controlled by the length of the hydrophilic main chain and the amount of side chains introduced, and the physical properties of the ink film can be controlled according to the purpose.

  Furthermore, in the conventional active energy ray-curable ink, almost all of the ink other than the colorant is curable, so that the dots after curing rise and the image quality represented by energy rays is inferior. The resin used requires only a small amount, and since there are many dry components, the image quality after drying is improved and the fixing property is also good.

(Photopolymerization initiator, sensitizer)
It is also preferable to add a photopolymerization initiator or a sensitizer. These compounds may be dissolved or dispersed in a solvent, or may be chemically bonded to the photosensitive resin.

  There is no restriction | limiting in particular about the photoinitiator and photosensitizer which are applied, A conventionally well-known thing can be used.

  Although there is no restriction | limiting in particular about the photoinitiator and photosensitizer which are applied, A water-soluble thing is preferable from a viewpoint of mixability and reaction efficiency. In particular, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone (HMPK), thioxanthone ammonium salt (QTX), and benzophenone ammonium salt (ABQ) are preferable from the viewpoint of miscibility with an aqueous solvent.

  Furthermore, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone (n = 1, HMPK) represented by the following general formula (9) from the viewpoint of compatibility with the resin, An ethylene oxide adduct (n = 2 to 5) is more preferable.

  In the formula, n represents an integer of 1 to 5.

  Other examples include benzophenones such as benzophenone, hydroxybenzophenone, bis-N, N-dimethylaminobenzophenone, bis-N, N-diethylaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone. Thioxanthones such as thioxatone, 2,4-diethylthioxanthone, isopropylthioxanthone, chlorothioxanthone, and isopropoxychlorothioxanthone. Anthraquinones such as ethyl anthraquinone, benzanthraquinone, aminoanthraquinone and chloroanthraquinone. Acetophenones. Benzoin ethers such as benzoin methyl ether. 2,4,6-trihalomethyltriazines, 1-hydroxycyclohexyl phenyl ketone, 2- (o-chlorophenyl) -4,5-diphenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di ( m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-phenylimidazole dimer, 2- (o-methoxyphenyl) -4,5-phenylimidazole dimer, 2- (P-methoxyphenyl) -4,5-diphenylimidazole dimer, 2, -di (p-methoxyphenyl) -5-phenylimidazole dimer, 2- (2,4-dimethoxyphenyl) -4,5 -2,4,5-triarylimidazole dimer of diphenylimidazole dimer, benzyldimethyl ketal, 2-benzyl-2-dimethyl Amino-1- (4-morpholinophenyl) butan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-1-propanone, 2-hydroxy-2-methyl-1-phenyl -Propan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, phenanthrenequinone, 9,10-phenanthrenequinone, Benzoins such as methylbenzoin and ethylbenzoin, 9-phenylacridine, acridine derivatives such as 1,7-bis (9,9'-acridinyl) heptane, bisacylphosphine oxide, and mixtures thereof are preferably used. May be used alone or in combination.

  In addition to these photopolymerization initiators, accelerators and the like can also be added. Examples of these include ethyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, ethanolamine, diethanolamine, triethanolamine and the like.

  Even if these photoinitiators are grafted to the side chain with respect to the hydrophilic main chain.

  Next, the operation of the ink jet recording apparatus having the above-described configuration will be described.

  By moving the carriage 4 in the WX1 direction, the recording medium P is main-scanned, and the recording medium P is transported in the WY direction, whereby sub-scanning is performed, and an image is formed on the recording medium P. In the image recording, the energy ray source 3 is always turned on, and the ink ejected from the recording head 2 is cured immediately after landing on the recording medium P.

  The carriage 4 moves in the print area covering the position facing the recording medium P for each main scan, but the carriage 4 moves to a position outside the print area, and the recording heads 2Y, 2M, 2C, 2K When it comes directly above the waste ink container 12, flushing for forcibly discharging ink from the recording head 2 is performed. The ink ejected from each recording head 2Y, 2M, 2C, 2K flows down to the waste ink container 12 and is collected.

  After the flushing, the carriage 4 further moves to a position outside the printing area facing the maintenance unit 10, for example, an end position. FIG. 3 shows the positional relationship when the carriage 4 moves to the end position facing the maintenance unit 10. As shown in FIG. 3, the position of the carriage 4 is set at a position where the energy ray source 3 irradiates the waste ink container 12. Is set. In the state shown in FIG. 3, the energy ray source 3 emits light, and the waste ink discharged to the waste ink container 12 is irradiated with ultraviolet rays to cure the waste ink.

  The flushing and the ultraviolet irradiation of the waste ink after the flushing are performed every time the carriage 4 is reciprocated. Accordingly, the discharged waste ink is stored in the waste ink container 12 in a solidified state.

  The flushing may be performed not every reciprocating operation of the carriage 4 but every predetermined number of reciprocating operations. Further, instead of causing the energy beam source 3 to emit light for each flushing and irradiating with ultraviolet rays, the ultraviolet rays may be irradiated every predetermined number of flushings.

  When ejection failure occurs in the recording head 2, the carriage 4 is set at a position facing the maintenance unit 10, and the suction pump 17 is operated with the suction cap 9 capping the recording head 2 to perform suction. Recovery processing is performed. The sucked waste ink is collected in a waste ink container 12.

  Even after the recovery process, the energy ray source 3 is turned on to irradiate the waste ink container 12 with ultraviolet rays, and the waste ink discharged into the waste ink container 12 is solidified.

  The recovery process is performed not only when an ejection failure occurs but also when the recording head is cleaned by an operator's operation or periodically.

1 is a diagram illustrating an overall configuration of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure which shows the flow of an ink. 3 is a diagram illustrating a positional relationship among the recording head 2, the energy ray source 3, the suction cap 9, and the waste ink container 12 when the carriage 4 is at a position facing the maintenance unit 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink tank 2 Recording head 3 Energy source 4 Carriage 12 Waste ink container

Claims (5)

A carriage configured to support an energy beam source for irradiating an active energy beam and a recording head that discharges ink that is cured by the active energy beam and configured to be capable of reciprocating in a print area;
A maintenance unit having suction means to perform recovery processing of the recording head, arranged outside the print area;
Wherein said print area as viewed in the moving direction of the carriage is disposed between the maintenance unit, a waste ink container for containing waste ink from the aspirated the recording head by the suction means of the maintenance unit,
An ink jet recording apparatus comprising:
The energy ray source is supported by the carriage so as to be disposed on the print area side with respect to the recording head when the carriage is located outside the print area. An ink jet recording apparatus , wherein an active energy ray is irradiated to waste ink stored in the waste ink container at a position facing the waste ink container outside a printing region by movement of a carriage.   The recording head is arranged to face the maintenance unit when the active energy ray is irradiated from the energy ray source to the waste ink stored in the waste ink container. Inkjet recording apparatus. 3. The ink jet recording apparatus according to claim 1, wherein ink discharged by flushing from the recording head disposed opposite to the waste ink container flows down and is collected .   The inkjet recording apparatus according to claim 1, wherein the energy beam source generates ultraviolet rays.   The inkjet recording apparatus according to claim 1, wherein an image is recorded using an ink that is cured in a gel state by irradiation with an active energy ray.

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