JP2021030674A - Recording device and recording method - Google Patents

Abstract

To provide a recording device and a recording method which can obtain excellent laminate adhesiveness when obtaining a recording matter that is laminated to be used and further can obtain excellent abrasion resistance when obtaining a recording matter that is used without being laminated.SOLUTION: A recording device, which performs recording on a recording medium comprises an ink adhesion part that makes an ink composition adhere to the recording medium, a heating part that heats the recording medium having the ink composition made to adhere thereto, and a control part. The ink composition is an aqueous ink composition containing an organic solvent. The control part sets heating conditions in a first recording mode in which a recording matter that is laminated to be used is obtained and a second recording mode in which a recording matter that is used without being laminated is obtained, respectively, and the control part controls heating by the heating part depending on the heating conditions. Residual amounts of the organic solvent heated by the heating part, in recording performed in the first recording mode are more than residual amounts of the organic solvent heated by the heating part, in recording performed in the second recording mode.SELECTED DRAWING: Figure 3

Description

The present invention relates to a recording device and a recording method.

The inkjet recording method is a relatively simple device capable of recording high-definition images, and is rapidly developing in various fields. Then, a method of adhering an ink composition on a recording medium to form an image by inkjet recording and then coating the surface of the recording medium with a laminate film is commercially used. For example, in Patent Document 1, a recording method capable of obtaining high lamination strength is studied.

Japanese Unexamined Patent Publication No. 2019-042944

In the recorded matter used by laminating, peeling of the laminating became a problem. Further, in the case of obtaining a recorded material to be used without laminating, when the recording surface is rubbed, the image is peeled off or the color of the ink is transferred, which causes a problem in abrasion resistance.

The present inventors have diligently studied to solve the above problems. As a result, when the relationship between the residual amount of the organic solvent and the lamination strength was investigated, it was found that a higher lamination strength could be obtained when a certain amount of the organic solvent remained.

That is, the present invention
A recording device that records on a recording medium.
An ink adhering part that adheres the ink composition to the recording medium,
A heating unit that heats the recording medium to which the ink composition is attached, and a heating unit.
With a control unit
The ink composition is a water-based ink composition containing an organic solvent.
The control unit sets heating conditions for each of the first recording mode for obtaining a recorded material to be used by laminating and the second recording mode for obtaining a recorded material to be used without laminating. Depending on the conditions, the heating by the heating unit is controlled, and the residual amount of the organic solvent after heating by the heating unit in the recording performed by the first recording mode is the heating of the recording performed by the second recording mode. The present invention relates to a recording device in which the amount of the organic solvent remaining after heating by the unit is larger than that of the organic solvent.

In addition, the present invention
A recording method for recording on a recording medium using a recording device including a control unit.
An ink adhesion process for adhering an ink composition to a recording medium,
A heating step of heating the recording medium to which the ink composition is attached is included.
The ink composition is a water-based ink composition containing an organic solvent.
The control unit sets heating conditions for each of the first recording mode for obtaining a recorded material used by laminating and the second recording mode for obtaining a recorded material used without laminating. The heating by the heating unit is controlled according to the heating conditions, and the residual amount of the organic solvent after heating by the heating unit in the recording performed by the first recording mode is the recording performed by the second recording mode. , More than the residual amount of the organic solvent after heating by the heating part,
The present invention relates to a recording method in which recording is performed in either the first recording mode or the second recording mode.

In addition, the present invention
It is a recording device that obtains a recorded material to be used by laminating by recording on a recording medium.
An ink adhering part that adheres the ink composition to the recording medium,
A heating unit that heats the recording medium to which the ink composition is attached, and a heating unit.
With a control unit
The ink composition is a water-based ink composition containing an organic solvent.
The control unit
By controlling the heating of the recording medium by the heating unit,
The residual amount of the organic solvent after heating by the heating unit is 5% by mass or more and 25% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. , A recording device.

In addition, the present invention
It is a recording method that obtains a recorded material to be used by laminating by recording on a recording medium.
An ink adhesion process for adhering an ink composition to a recording medium,
A heating step of heating the recording medium to which the ink composition is attached is included.
The ink composition is a water-based ink composition containing an organic solvent.
The residual amount of the organic solvent after heating of the recording medium in the heating step is 5% by mass or more and 25% by mass with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. It is a recording method that is less than%.

The above-mentioned invention preferably has the following aspects.
The ink adhering portion in the recording device is preferably an inkjet head that ejects the ink composition. The recording device preferably has a processing liquid adhering portion for adhering the treatment liquid containing a flocculant to the recording medium.

The ink composition preferably contains a wax, a silicone-based surfactant or a fluorine-based surfactant. The total content of the wax, the silicone-based surfactant, and the fluorine-based surfactant in the ink composition is 0.5% by mass or more and 6.0% by mass or less with respect to the total mass of the ink composition. The ink composition preferably contains 0.5% by mass or more and 4% by mass or less of wax with respect to the total mass of the ink composition.

The recording medium is preferably a polyolefin film.

At least one of the ink composition in the first recording mode and the ink composition in the second recording mode preferably contains a clear ink composition containing a resin. At least one of the ink composition in the first recording mode and the ink composition in the second recording mode preferably contains a colored ink composition containing a coloring material. The ink composition in the second recording mode preferably contains a clear ink composition containing a resin. The residual amount set in the first recording mode is preferably 5% by mass or more and 25% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. The residual amount set in the two recording modes is preferably 10% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. The residual amount in the first recording mode is preferably 2% by mass or more larger than the residual amount in the second recording mode.

Schematic cross-sectional view schematically showing an inkjet recording apparatus. The perspective view which shows an example of the structure around the carriage of the inkjet recording apparatus of FIG. The flowchart which shows an example of the function of the inkjet recording apparatus schematically.

Hereinafter, embodiments of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings as necessary, but the present invention is not limited thereto, and a gist thereof. Various deformations are possible within the range that does not deviate from. In the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted. In addition, the positional relationship such as up, down, left, and right shall be based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown.

The recording device of this embodiment is a device that records on a recording medium. The recording device of the present embodiment includes an ink adhering portion for adhering the ink composition to the recording medium, a heating portion for heating the recording medium to which the ink composition is adhered, and a control unit. The ink composition is a water-based ink composition containing an organic solvent. In addition, the control unit sets the heating conditions by the heating unit for each of the first recording mode for obtaining the recorded material used by laminating and the second recording mode for obtaining the recorded material used without laminating. The heating of the recording medium by the heating unit is controlled according to the heating conditions. Then, the residual amount of the organic solvent after heating by the heating unit in the recording performed in the first recording mode is larger than the residual amount of the organic solvent after heating by the heating unit in the recording performed in the second recording mode. ..
The heating condition is information for controlling the heating condition by the heating unit. For example, it is information for controlling the heating temperature, time, and the like. Further, the heating unit may set the residual amount of the organic solvent after heating as information. In this case, the heating may be performed by adjusting the heating temperature and time so that the remaining amount of the organic solvent is set. The heating condition may be specifically a computer-readable code. This code controls the heating temperature and heating time of the heating unit.
According to the above configuration, a recording device capable of obtaining excellent laminate adhesion when obtaining a recorded material to be used by laminating, and further obtaining excellent abrasion resistance when obtaining a recorded material to be used without laminating. And a recording method can be provided.

The mechanism by which such an effect is obtained is not clear, but is considered as follows.
Conventionally, it has been considered that the lamination strength is lowered because a small amount of the organic solvent contained in the ink remains on the recording surface. However, the surface of the coating film of the ink composition is uneven, and the contact with the laminated film is poor, so that adhesion may not be obtained in some cases. Therefore, in the present embodiment, it is presumed that the residual amount of the organic solvent is rather large, so that the coating film of the ink is dissolved and smoothed by the organic solvent to improve the contact with the laminate film and obtain the adhesion. In addition, it is considered that the components contained in the ink composition may reduce the adhesion to the laminated film, but the large amount of the organic solvent remaining in the coating film rather suppresses the deterioration of the adhesion due to other components. It is presumed that it can be done.

The recording apparatus and recording method of the present embodiment can be applied to any recording apparatus and recording method that uses ink such as inkjet recording, office printing, screen printing, and gravure printing. Among these, an inkjet recording device and an inkjet recording method are preferable. Hereinafter, an example of the recording device and the recording method according to the present embodiment will be described by taking the inkjet recording device and the inkjet recording method as an example.

Inkjet Recording Device An example of the inkjet recording device of the present embodiment will be described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view schematically showing an inkjet recording device. FIG. 2 is a perspective view showing an example of the configuration around the carriage of the inkjet recording device 1 of FIG. As shown in FIGS. 1 and 2, the inkjet recording device 1 includes an inkjet head 2, an IR heater 3, a platen heater 4, a heating heater 5, a cooling fan 6, a preheater 7, a ventilation fan 8, and the like. It includes a carriage 9, a platen 11, a carriage moving mechanism 13, a transport means 14, and a control unit CONT. In the inkjet recording device 1, the operation of the entire inkjet recording device 1 is controlled by the control unit CONT shown in FIG.

The inkjet head 2 is a means for recording on a recording medium 10 by ejecting an ink composition and a treatment liquid that agglomerates the components of the ink composition from a nozzle (see FIG. 3) and adhering them. In the present embodiment, the inkjet head 2 is a serial recording type inkjet head, and scans a plurality of times in the main scanning direction relative to the recording medium 10 to attach the ink composition and the treatment liquid to the recording medium 10. .. The inkjet head 2 is mounted on the carriage 9 shown in FIG. The inkjet head 2 is scanned a plurality of times in the main scanning direction relative to the recording medium 10 by the operation of the carriage moving mechanism 13 that moves the carriage 9 in the medium width direction of the recording medium 10. The medium width direction is the main scanning direction of the inkjet head 2. Scanning in the main scanning direction is also referred to as main scanning.

A conventionally known method can be used for ejection of the inkjet head 2. In the present embodiment, a method of ejecting droplets by utilizing the vibration of the piezoelectric element, that is, an ejection method of forming ink droplets by mechanical deformation of the electrolytic strain element is used. Details of the configurations around the inkjet head 2 and the carriage 9 will be described later.

The inkjet recording device 1 includes an IR heater 3 and a platen heater 4 for heating the recording medium 10 when ejecting the ink composition or the treatment liquid from the inkjet head 2, that is, for primary heating or primary drying. In the present embodiment, when the recording medium 10 is heated in the ink adhesion step described later, at least one of the IR heater 3 and the platen heater 4 may be used.

When the IR heater 3 is used, the recording medium 10 can be heated from the side of the inkjet head 2. As a result, the inkjet head 2 is likely to be heated at the same time, but the temperature can be raised without being affected by the thickness of the recording medium 10 as compared with the case where it is heated from the back surface of the recording medium 10 such as the platen heater 4. Further, if the platen heater 4 is used when heating the recording medium 10, the recording medium 10 can be heated from the side opposite to the inkjet head 2 side. As a result, the inkjet head 2 is relatively less likely to be heated.

The upper limit of the surface temperature of the recording medium 10 by the IR heater 3 and the platen heater 4 is preferably 45 ° C. or lower, more preferably 40 ° C. or lower, and even more preferably 38 ° C. or lower. It is particularly preferable that the temperature is 35 ° C. or lower. The lower limit of the surface temperature of the recording medium 10 is preferably 25 ° C. or higher, more preferably 28 ° C. or higher, further preferably 30 ° C. or higher, and particularly preferably 32 ° C. or higher. .. As a result, the radiant heat received from the IR heater 3 and the platen heater 4 is small or not received, so that the drying and composition fluctuation of the ink composition in the inkjet head 2 can be suppressed, and the welding of the ink component to the inner wall of the inkjet head 2 is suppressed. Will be done. In addition, the ink can be fixed at an early stage, and the image quality can be improved.

The heater 5 is a heater for drying and solidifying the ink composition attached to the recording medium 10, that is, for secondary heating or secondary drying. When the heating heater 5 heats the recording medium 10 on which the image is recorded, the water content contained in the ink evaporates and scatters more quickly, and the resin contained in the ink forms an ink film. In this way, the ink film is firmly fixed or adhered on the recording medium 10 to have excellent film-forming properties, and an excellent high-quality image can be obtained in a short time. The upper limit of the surface temperature of the recording medium 10 by the heater 5 is preferably 120 ° C. or lower, more preferably 100 ° C. or lower, and even more preferably 90 ° C. or lower. The lower limit of the surface temperature of the recording medium 10 is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, and even more preferably 80 ° C. or higher. When the temperature is in the above range, a high-quality image can be obtained in a short time.

The inkjet recording device 1 may have a cooling fan 6. After the ink composition recorded on the recording medium 10 is dried, the ink composition on the recording medium 10 is cooled by the cooling fan 6, so that an ink coating film can be formed on the recording medium 10 with good adhesion.

Further, the inkjet recording device 1 may include a preheater 7 that preheats the recording medium 10 before the ink composition adheres to the recording medium 10. Further, the inkjet recording device 1 may be provided with a ventilation fan 8 so that the ink composition and the treatment liquid adhering to the recording medium 10 are dried more efficiently.

Below the carriage 9, there are a platen 11 on which the recording medium 10 is conveyed, a carriage moving mechanism 13 that moves the carriage 9 relative to the recording medium 10, and a roller that conveys the recording medium 10 in the sub-scanning direction. A certain transport means 14 is provided. The carriage moving mechanism 13 is a scanning means that scans the inkjet head 2 in the main scanning direction. The operations of the carriage moving mechanism 13 and the transport means 14 are controlled by the control unit CONT.

-Inkjet head-
In the present embodiment, the inkjet head 2 ejects and adheres the ink composition and the treatment liquid onto the recording medium 10 while moving in the main scanning direction by moving the carriage 9. As described above, in the present embodiment, the inkjet head 2 is scanned a plurality of times in the main scanning direction relative to the recording medium 10 for recording.

Here, the main operation direction is the direction in which the carriage 9 on which the inkjet head 2 is mounted moves. In FIG. 1, the direction intersects the sub-operation direction, which is the transport direction of the recording medium 10 indicated by the arrow SS. In FIG. 2, the width direction of the recording medium 10, that is, the direction of S1-S2 is the main scanning direction MS, and the direction of T1 → T2 is the sub-scanning direction SS. In addition, scanning is performed in one of the main scanning directions, that is, the left-right direction of the inkjet recording device 1 in one scanning. Then, the main scan of the inkjet head 2 and the sub-scan, which is the transport of the recording medium 10, are alternately repeated to record on the recording medium 10.

In the present embodiment, the cartridge 12 that supplies the ink composition and the treatment liquid to the inkjet head 2 is composed of a plurality of independent cartridges. The cartridge 12 is detachably attached to the carriage 9 on which the inkjet head 2 is mounted. Each of the plurality of cartridges is filled with different types of ink compositions and treatment liquids, and the cartridge 12 supplies the ink compositions and treatment liquids to each nozzle. In the present embodiment, the cartridge 12 is mounted on the carriage 9, but the cartridge 12 is not limited to this, and is provided in a place other than the carriage 9 and is attached to each nozzle by a supply pipe (not shown). It may be in the form of being supplied.

FIG. 3 is a flowchart showing a process performed when recording is performed in the inkjet recording device. When starting recording, the control unit of the inkjet recording device determines the recording mode in step 400. The recording mode is for controlling the drying conditions of the organic solvent of the recorded material by the heating conditions of the IR heater 3, the platen heater 4 and the heating heater 5 used for recording, and the conditions of blowing warm air to the recording medium by the cooling fan 6. This is a mode of recording in which the details of the above are defined. The details of the recording may include the amount of the treatment liquid adhered to be described later.

In the present embodiment, the first recording mode is a recording mode in which the obtained recorded material is a recorded material used by laminating. The second recording mode is a recording mode in which the obtained recorded material is a recorded material that is used without laminating. In the first recording mode and the second recording mode, information on the heating conditions for controlling the heating conditions by the heating unit is associated with each other. This information is provided in the control unit.

The recording mode is determined by an input signal input from an external device such as a computer to the inkjet recording device, or by user input information to a user input unit included in the inkjet recording device. Here, the input signal from the external device and the input information of the user may be information for directly designating the recording mode, recording medium type information to be recorded, recording speed designation, image quality designation, and the like. , May be information about the record. Information about records is not limited to these. In the latter case, the inkjet recording device records the corresponding information in which the recording mode corresponding to the information related to the recording is determined in advance in the inkjet recording device such as the control unit, and determines the recording mode with reference to the corresponding information. .. Alternatively, it may be determined using AI technology (artificial intelligence technology).

In step S401, the determined recording mode is determined. In steps S402 or S403, the heating unit is controlled according to the heating conditions corresponding to the recording mode according to the determined recording mode. Adjust the heating temperature and so on. Recording is executed in step S404. Although two types of recording modes are shown in the figure, there may be three or more types. The heating unit may be controlled before the start of recording as shown in the figure, or may be performed during recording. That is, the recording may be performed in a state where the heating unit is controlled by the heating conditions.

-Water-based colored ink composition-
The water-based colored ink composition of the present embodiment (hereinafter, also simply referred to as “colored ink composition”) contains a coloring material. Here, the "water-based ink composition" is an ink composition in which the content of water with respect to the total mass of the ink composition is 30% by mass or more.

The coloring material may be a pigment or a dye.

The pigment may be an organic pigment or an inorganic pigment. The organic pigment is not particularly limited, but for example, azo pigments such as azo lake pigments, insoluble azo pigments, condensed azo pigments and chelate azo pigments, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments and thioindigo pigments. , Isoindolinone pigments, isoindolin pigments, quinophthalone pigments, polycyclic pigments such as diketopyrrolopyrrole pigments, dye lake pigments such as basic dye type lakes and acidic dye type lakes, nitro pigments, nitroso pigments, aniline black, Daylight fluorescent pigments can be mentioned. The inorganic pigment is not particularly limited, and examples thereof include metal oxide pigments such as titanium dioxide, zinc oxide, and chromium oxide, and carbon black.

The pigment is not particularly limited, but for example, C.I. I. (Color Index Generic Name) Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42, 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 153, 155, 180, C.I. I. Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48: 2 (Permanent Red 2B (Ba)), 48: 2 (Permanent Red 2B (Ca)), 48: 3, 48: 4, 49: 1, 52: 2, 53: 1, 57: 1, 60: 1, 63: 1, 63: 2, 64: 1, 81, 83, 88, 101, 104, 105, 106, 108, 112, 114, 122, 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 185, 190, 193, 209, 219, C.I. I. Pigment Violet 19, 23, C.I. I. Pigment Blue 1, 2, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 17: 1, 56, 60, 63, C.I. I. Pigment Greens 1, 4, 7, 8, 10, 17, 18, and 36 can be mentioned.

The pigment for black is not particularly limited, but for example, C.I. I. Pigment Black 1, 7 (carbon black), 11 can be mentioned.

The white pigment for white is not particularly limited, but for example, C.I. I. Pigment White 1, composed of zinc oxide, C.I. I. Pigment White 4, a mixture of zinc sulfide and barium sulphate. I. Pigment White 5, C.I. made of titanium oxide. I. Pigment White 6, composed of titanium oxide containing other metal oxides, C.I. I. Pigment White 6: 1, composed of zinc sulfide C.I. I. Pigment White 7, C.I. consisting of calcium carbonate. I. Pigment White 18, C.I. I. Pigment White 19, C.I. made of mica titanium. I. Pigment White 20, C.I., consisting of barium sulfate. I. Pigment White 21, composed of plaster C.I. I. Pigment White 22, composed of magnesium oxide and silicon dioxide, C.I. I. Pigment White 26, C.I. I. Pigment White 27 and C.I. I. Pigment White 28 can be mentioned. Among these, titanium oxide (CI Pigment White 6) is preferable because it is excellent in color development and hiding power.

In addition to these coloring pigments, bright pigments such as pearl pigments and metallic pigments may be used.
The pigment may be surface treated to enhance the dispersibility of the pigment in the ink composition.
The surface treatment of a pigment is a method of introducing a functional group having an affinity with the medium of the ink composition onto the particle surface of the pigment by physical treatment or chemical treatment. For example, when used in the water-based ink composition described later, it is preferable to introduce a hydrophilic group such as a carboxy group or a sulfo group.
In addition, these pigments may be used individually by 1 type or in combination of 2 or more types.

The content of the coloring material is preferably 0.1% by mass or more and 30.0% by mass or less, and more preferably 0.5% by mass or more and 20.0% by mass or less with respect to the total mass of the colored ink composition. It is more preferably 1.0% by mass or more and 15.0% by mass or less, and even more preferably 1.5% by mass or more and 10.0% by mass or less. By setting the content of the pigment within the above range, it is possible to secure the color development of an image or the like formed on a recording medium or the like, and to suppress an increase in the viscosity of the inkjet ink and the occurrence of clogging in the inkjet head.

--wax--
The colored ink composition preferably contains wax from the viewpoint of further improving the abrasion resistance. The wax is not particularly limited, and examples thereof include a hydrocarbon wax and an ester wax which is a condensate of a fatty acid and a monohydric alcohol or a polyhydric alcohol. The hydrocarbon wax is not particularly limited, and examples thereof include paraffin wax and polyolefin wax. One type of these waxes may be used alone, or two or more types may be used in combination. Among these waxes, hydrocarbon waxes are preferable, and polyolefin waxes are more preferable, from the viewpoint of improving abrasion resistance.

Examples of commercially available paraffin wax products include AQUACER497 and AQUACER539 (product names, manufactured by BYK).

Commercially available products of polyolefin wax include, for example, Chemipearl S120, S650, S75N (product name, manufactured by Mitsui Chemicals, Inc.), AQUACER501, AQUACER506, AQUACER513, AQUACER515, AQUACER526, AQUACER593, and AQUACER582 (product name, manufactured by AQUACER582). Can be mentioned.

The number average molecular weight of the wax is preferably 10,000 or less, more preferably 8,000 or less, still more preferably 6,000 or less, and even more preferably 4,000 or less. The number average molecular weight of the wax is preferably 1,000 or more.

The melting point of the wax is preferably 50 ° C. or higher and 200 ° C. or lower, more preferably 70 ° C. or higher and 180 ° C. or lower, and further preferably 90 ° C. or higher and 180 ° C. or lower.

The wax is preferably added, for example, as wax particles contained in an aqueous emulsion in which the wax is dispersed in water. The wax particles may contain, for example, a surfactant for dispersion.

The average particle size of the wax particles is preferably 30 nm or more and 500 nm or less, more preferably 35 nm or more and 300 nm or less, and further preferably 40 nm or more and 120 nm or less. The average particle size is based on volume unless otherwise specified. As a measuring method, for example, it can be measured by a particle size distribution measuring device based on a laser diffraction / scattering method. Examples of the particle size distribution measuring device include a particle size distribution meter (for example, Microtrack UPA manufactured by Nikkiso Co., Ltd.) based on a dynamic light scattering method.

The wax content is preferably 0.5% by mass or more and 4.0% by mass or less, and more preferably 0.5% by mass or more and 3.0% by mass or less, based on the total mass of the colored ink composition. Yes, more preferably 0.5% by mass or more and 1.0% by mass or less. When the wax content is within the above range, the abrasion resistance of the recorded material can be further improved.

--Resin particles--
The colored ink composition used in this embodiment preferably contains resin particles. Since the colored ink composition contains resin particles, a resin film can be formed by heating the recording medium to which the colored ink composition is attached. The resin particles are, for example, resin particles contained in an aqueous emulsion in which a resin is dispersed in water.

The resin is not particularly limited, and examples thereof include (meth) acrylic resin, urethane resin, polyether resin, and polyester resin. Among these resins, (meth) acrylic resins are preferable. In addition, in this specification, "(meth) acrylic" is a concept including both "methacryl" and "acrylic".

The (meth) acrylic resin is not particularly limited, and examples thereof include an acrylic resin emulsion. The acrylic resin emulsion is not particularly limited, and for example, a polymerized (meth) acrylic monomer such as (meth) acrylic acid and (meth) acrylic acid ester, and a (meth) acrylic monomer. And other monomers are copolymerized with each other. The above-mentioned copolymer may be in any form of a random copolymer, a block copolymer, an alternating copolymer, and a graft copolymer. Commercially available acrylic resin emulsions include, for example, Movinyl 966A, 972, 8055A (product name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), Microgel E-1002, and Microgel E-5002 (product name, Nippon Paint Co., Ltd.). (Company), Boncoat 4001, Boncoat 5454 (Product name, manufactured by DIC Corporation), SAE1014 (Product name, manufactured by Nippon Zeon Co., Ltd.), Cybinol SK-200 (Product name, manufactured by Saiden Chemical Co., Ltd.), John Krill 7100, 390, 711, 511, 7001, 632, 741, 450, 840, 62J, 74J, HRC-1645J, 734, 852, 7600, 775, 537J, 1535, PDX-7630A, 352J, 352D, PDX-7145, Examples thereof include 538J, 7640, 7641, 631, 790, 780, 7610 (product name, manufactured by BASF), and NK binder R-5HN (product name, product name manufactured by Shin-Nakamura Chemical Co., Ltd.). Among these resins, a (meth) acrylic resin or a styrene- (meth) acrylic acid copolymer resin is preferable, and an acrylic resin or a styrene-acrylic acid copolymer resin is more preferable, and styrene. -It is more preferable that it is an acrylic acid copolymer resin.

Examples of urethane-based resins include urethane resin emulsions. The urethane resin emulsion is not particularly limited, but for example, a polyether type urethane resin having an ether bond in the main chain, a polyester type urethane resin having an ester bond in the main chain, and a polycarbonate type urethane resin having a carbonate bond in the main chain. Can be mentioned. Commercially available urethane resin emulsions include, for example, Sancure 2710 (product name, manufactured by Japan Lubrizol Co., Ltd.), Permarin UA-150 (product name, manufactured by Sanyo Kasei Kogyo Co., Ltd.), Superflex 460, 470, 610, etc. 700, 860 (product name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), NeoRez R-9660, R-9637, R-940 (product name, manufactured by Kusumoto Kasei Co., Ltd.), ADEKA BONTITER HUX-380, 290K (Product name, manufactured by Kusumoto Kasei Co., Ltd.) The above product names include ADEKA Corporation, Takelac W-605, W-635, WS-6021 (product name, manufactured by Mitsui Chemicals Co., Ltd.), and polyether (manufactured by Taisei Fine Chemicals Co., Ltd.).

The polyester-based resin is not particularly limited, and examples thereof include polybutylene terephthalate, polytrimethylene terephthalate, polyethylene terephthalate, and polyethylene naphthalate. The polyester-based resin may be a sulfopolyester resin (polysulfoester resin) substituted with a sulfo group (sulfonic acid group).

The glass transition temperature (Tg) of the resin is preferably −35 ° C. or higher, more preferably 0 ° C. or higher, still more preferably 20 ° C. or higher, even more preferably 35 ° C. or higher, and even more preferably. Is 40 ° C. or higher. The glass transition temperature of the resin is preferably 70 ° C. or lower, more preferably 60 ° C. or lower. The glass transition temperature can be changed, for example, by changing the type and composition ratio of the monomer used for polymerizing the resin, the polymerization conditions, and at least one type of modification of the resin. For example, the glass transition temperature can be adjusted by reducing the number of polymerizable functional groups, lowering the crosslink density of the resin, or using a monomer having a relatively large molecular weight (a monomer having a large number of carbon atoms). .. The polymerization conditions include the temperature at the time of polymerization, the type of the medium containing the monomer, the concentration of the monomer in the medium, and the type and amount of the polymerization initiator and catalyst used at the time of polymerization. The glass transition temperature of the resin can be measured by the differential scanning calorimetry (DSC method) based on JIS K7121.

The content of the resin particles is preferably 500 parts by mass or less, more preferably 400 parts by mass or less, and further preferably 300 parts by mass or less with respect to 100 parts by mass of the wax. The content of the resin particles is 0 parts by mass or more, preferably 50 parts by mass or more, and more preferably 100 parts by mass or more.

The content of the resin particles in the colored ink composition is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, based on the total mass of the colored ink composition. Is. The content is 0% by mass or more, preferably 1.0% by mass or more, more preferably 2.0% by mass or more, and further preferably 3.0% by mass or more.

--water--
The colored ink composition according to this embodiment contains water. The water is not particularly limited, and examples thereof include pure water such as ion-exchanged water, ultra-filtered water, reverse osmosis water, and distilled water, and ultrapure water.

The content of water in the colored ink composition is preferably 10.0% by mass or more, more preferably 10.0% by mass or more and 80.0% by mass or less, based on the total amount of the colored ink composition. , More preferably 15.0% by mass or more and 75.0% by mass or less, and further preferably 20.0% by mass or more and 70.0% by mass or less.

--Water-soluble organic solvent--
The colored ink composition of the present embodiment may further contain a water-soluble organic solvent from the viewpoint of viscosity adjustment and moisturizing effect.

The water-soluble organic solvent is not particularly limited, and examples thereof include glycerin, lower alcohols, glycols, acetins, derivatives of glycols, nitrogen-containing solvent, β-thiodiglycol, and sulfolane. Among these, from the viewpoint of further improving the abrasion resistance, it is preferable that a nitrogen-containing solvent is contained, and it is more preferable that a nitrogen-containing solvent and glycols are contained.

The nitrogen-containing solvent is not particularly limited, and examples thereof include 2-pyrrolidone, N-alkyl-2-pyrrolidone, 1-alkyl-2-pyrrolidone, and ε-caprolactam.

The content of the nitrogen-containing solvent is preferably 1% by mass or more, more preferably 5% by mass or more, and further preferably 10% by mass or more with respect to the total content of the water-soluble organic solvent. The content of the nitrogen-containing solvent is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, based on the total content of the water-soluble organic solvent. is there.

The content of the nitrogen-containing solvent in the colored ink composition is preferably 1% by mass or more, more preferably 2% by mass or more, still more preferably 3% by mass, based on the total mass of the colored ink composition. % Or more. The content of the nitrogen-containing solvent is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, based on the total mass of the colored ink composition. ..

The glycols are not particularly limited, and examples thereof include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, propylene glycol, dipropylene glycol, and tripropylene glycol.

The content of glycols is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more, based on the total content of the water-soluble organic solvent. The content of glycols is 100% by mass or less, more preferably 90% by mass or less, based on the total content of the water-soluble organic solvent.

The content of glycols in the colored ink composition is preferably 1% by mass or more, more preferably 5% by mass or more, still more preferably 10% by mass or more, based on the total mass of the colored ink composition. Is. The content of glycols is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less, based on the total mass of the colored ink composition.

The lower alcohols are not particularly limited, and examples thereof include methanol, ethanol, 1-propanol, isopropanol, 1-butanol, 2-butanol, isobutanol, 2-methyl-2-propanol, and 1,2-hexanediol. Can be mentioned.

The acetyls are not particularly limited, and examples thereof include monoacetin, diacetin, and triacetin.

The glycol derivatives are not particularly limited, but are, for example, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and tetraethylene glycol mono. Ethyl ether, tetraethylene glycol dimethyl ether, and tetraethylene glycol diethyl ether can be mentioned. These water-soluble organic solvents may be used alone or in combination of two or more.

Among these water-soluble organic solvents, glycerin and lower alcohols are preferable, and glycerin and 1,2-hexanediol are more preferable.

When the colored ink composition contains a water-soluble organic solvent, the content thereof is preferably 1.0% by mass or more and 50.0% by mass or less, more preferably 5 with respect to the total amount of the colored ink composition. It is 0.0% by mass or more and 40.0% by mass or less, and more preferably 10.0% by mass or more and 30.0% by mass or less.

--Surfactant--
The colored ink composition of the present embodiment preferably further contains a surfactant B from the viewpoint that the ink composition can be stably ejected by an inkjet recording method and the penetration of the ink composition can be appropriately controlled. To do. The surfactant is not particularly limited, and examples thereof include a fluorine-based surfactant, a silicone-based surfactant, and an acetylene glycol-based surfactant.

The fluorine-based surfactant is not particularly limited, and is, for example, perfluoroalkyl sulfonate, perfluoroalkyl carboxylate, perfluoroalkyl phosphate, perfluoroalkyl ethylene oxide adduct, perfluoroalkyl betaine, and the like. Perfluoroalkylamine oxide compounds can be mentioned. These may be used individually by 1 type or in combination of 2 or more type. Commercially available products of fluorine-based surfactants include, for example, Surflon S144, S145 (product name, manufactured by AGC Seimi Chemical Co., Ltd.), FC-170C, FC-430, Florard-FC4430 (product name, Sumitomo 3M Ltd.). , FSO, FSO-100, FSN, FSN-100, FS-300 (product name, manufactured by DuPont), FT-250, 251 (product name, manufactured by Neos Co., Ltd.).

The silicone-based surfactant is not particularly limited, and examples thereof include polysiloxane-based compounds and polyether-modified organosiloxanes. These may be used individually by 1 type or in combination of 2 or more type. Commercially available silicone-based surfactants include, for example, BYK-306, BYK-307, BYK-333, BYK-341, BYK-345, BYK-346, BYK-347, BYK-348, BYK-349 (and above). Product name, manufactured by BYK), KF-351A, KF-352A, KF-353, KF-354L, KF-355A, KF-615A, KF-945, KF-640, KF-642, KF-643, KF- Examples thereof include 6020, X-22-4515, KF-6011, KF-6012, KF-6015, and KF-6017 (the above product names are manufactured by Shin-Etsu Chemical Co., Ltd.).

When the colored ink composition contains a fluorine-based surfactant and a silicone-based surfactant, the total content thereof is preferably 0.1% by mass or more and 5.0% by mass or less with respect to the total amount of the ink composition. It is more preferably 0.2% by mass or more and 3.0% by mass or less, and further preferably 0.2% by mass or more and 1.0% by mass or less.

The colored ink composition may contain an acetylene glycol-based surfactant. The acetylene glycol-based surfactant is not particularly limited, and is, for example, 2,4,7,9-tetramethyl-5-decine-4,7-diol and 2,4,7,9-tetramethyl-5-. Selected from alkylene oxide adducts of decine-4,7-diol and alkylene oxide adducts of 2,4-dimethyl-5-decine-4-ol and 2,4-dimethyl-5-decine-4-ol. One or more is preferable. Commercially available products of acetylene glycol-based surfactants are not particularly limited, but for example, E series such as Orfin 104 series and Orfin E1010 (the above product names are manufactured by Air Products & Chemicals), Surfinol 465, 61, and DF110D (the above products). Name, manufactured by Nissin Chemical Industry Co., Ltd.).

The content of the acetylene glycol-based surfactant in the colored ink composition is preferably 10.0% by mass or less, more preferably 5.0% by mass or less, based on the total mass of the colored ink composition. , More preferably 1.0% by mass or less. The content is 0% by mass or more, preferably 0.1% by mass or more, and more preferably 0.2% by mass or more.

Colored ink compositions, as other additives, affect pH regulators, softeners, waxes, solubilizers, viscosity regulators, antioxidants, fungicides / preservatives, fungicides, corrosion inhibitors, and dispersions. Various additives such as a chelating agent (for example, sodium ethylenediamine tetraacetate) for capturing metal ions may be appropriately contained.

The total content of the wax, the silicone-based surfactant, and the fluorine-based surfactant is preferably 0.5% by mass or more and 6.0% by mass or less, more preferably, based on the total mass of the colored ink composition. Is 0.5% by mass or more and 5.0% by mass or less, and more preferably 0.5% by mass or more and 4.0% by mass or less.

The solid content concentration in the colored ink composition is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and further preferably 8.0% by mass or more. The solid concentration is preferably 30.0% by mass or less, more preferably 25.0% by mass or less, and further preferably 20.0% by mass or less.

In the present embodiment, the colored ink composition is obtained by mixing the above-mentioned components in an arbitrary order and, if necessary, performing filtration or the like to remove impurities. As a method of mixing each component, a method of sequentially adding materials to a container equipped with a stirring device such as a mechanical stirrer or a magnetic stirrer and stirring and mixing them is preferably used. As the filtration method, centrifugal filtration, filter filtration and the like can be performed as needed.

-Aqueous clear ink composition-
The water-based clear ink composition of the present embodiment (hereinafter, also simply referred to as “clear ink composition”) contains wax particles. The "clear ink composition" is not an ink composition for coloring a recording medium, but an ink composition for other purposes. Another purpose is, for example, to adjust the glossiness and abrasion resistance of the recorded material. The content of the coloring material in the clear ink composition is preferably 0.1% by mass or less, preferably 0.05% by mass or less, and may be 0% by mass with respect to the total amount (100% by mass) of the ink composition.

The clear ink composition may contain the same components as the above-mentioned colored ink composition except that it does not contain a colorant, and may contain waxes, resin particles, water-soluble organic solvents, surfactants or other additives. May include. Examples and contents of these components are the same as those of the above-mentioned clear ink composition. In addition, the colored ink composition captures other components such as dissolution aids, viscosity regulators, pH regulators, antioxidants, preservatives, fungicides, corrosion inhibitors, and metal ions that affect dispersion. Various additives such as a chelating agent for the purpose can be added as appropriate.

Inkjet Recording Method The inkjet recording method of the present embodiment may be a serial type recording method or a line type recording method, but hereinafter, serial using the above-mentioned inkjet recording device provided with an inkjet head. The method of recording the formula will be described as an example. The inkjet recording method of the present embodiment includes an ink adhesion step of adhering the above-mentioned ink composition to a recording medium and a heating step of heating the recording medium to which the ink composition is adhered.

-Ink adhesion process-
In the ink adhesion step, the above-mentioned ink composition is adhered to the recording medium.

--recoding media--
The recording medium is not particularly limited, and for example, either an absorbent or non-absorbable recording medium may be used, but the recording medium is preferably a low-absorbency recording medium or a non-absorbent recording medium.

As used herein, the term "absorbent recording medium" means a recording medium having the property of absorbing an ink composition. "Low-absorbency recording medium or non-absorbent recording medium" means a recording medium having a property of not absorbing or hardly absorbing the ink composition. Quantitatively, the "low-absorption recording medium or non-absorbent recording medium" is a recording medium in which the ^{amount of water absorbed from the start of contact to 30 msec 1/2} in the Bristow method is 10 mL / m ^{2 or less.} .. The "absorbent recording medium" is a recording medium having a water absorption amount of more than ^{10 mL / m 2.} For details of this Bristow method, refer to the standard No. of "JAPAN TAPPI Pulp and Paper Test Method 2000 Edition". 51 According to the description of "Paper and paperboard-Liquid absorbency test method-Bristow method".

The low-absorbency recording medium or non-absorbent recording medium is not particularly limited, and is, for example, a film or plate of plastics such as polyvinyl chloride (hereinafter, also referred to as “PVC”), polyethylene, polypropylene, and polyethylene terephthalate, and iron. , Silver, copper, aluminum and other metal plates, metal plates produced by vapor deposition of these various metals, plastic films, stainless steel, alloy plates such as true cast and the like. Of these, polyolefin films are preferred.

The amount of the ink composition adhered to the recording medium per unit area is preferably 0.1 mg / inch ² or more, more preferably 0.5 mg / inch ² or more, and further preferably 1 mg / inch ² or more. is there. The amount of the ink composition adhered per unit area of the recording medium is preferably 20 mg / inch ² or less, more preferably 18 mg / inch ² or less, and further preferably 16 mg / inch ² or less.

The ink adhering step may include a colored ink adhering step of adhering the colored ink composition to the recording medium and a clear ink adhering step of adhering the clear ink composition to the recording medium. In the first recording mode for obtaining a recorded material to be laminated and used, the ink adhesion step may be only a colored ink adhesion step, or may include a colored ink adhesion step and a clear ink adhesion step. In the second recording mode for obtaining a recorded material to be used without laminating, the ink adhesion step may be only a colored ink adhesion step, or may include a colored ink adhesion step and a clear ink adhesion step. However, it is preferable to include a coloring ink adhering step and a clear ink adhering step.

--Colored ink adhesion process--
In the colored ink adhering step in the present embodiment, the above-mentioned colored ink composition is ejected from the inkjet head and adhered to the recording medium. The amount of the colored ink composition adhered to the recording medium per unit area is preferably 3 mg / inch ² or more, more preferably 5 mg / inch ² or more, and further preferably 10 mg / inch ² or more. The amount of the ink composition adhered per unit area of the recording medium is preferably 20 mg / inch ² or less, more preferably 18 mg / inch ² or less, and further preferably 16 mg / inch ² or less.

--Clear ink adhesion process--
In the clear ink adhesion step in the present embodiment, the above-mentioned clear ink composition is ejected from the inkjet head and adhered to the recording medium. In the clear ink adhesion step, the clear ink may be adhered as an overcoat that covers the surface to which the colored ink is adhered.

The amount of the clear ink composition adhered to the recording medium per unit area is preferably 0.1 mg / inch ² or more, more preferably 0.5 mg / inch ² or more, and further preferably 1 mg / inch ² or more. Is. The amount of the ink composition adhered per unit area of the recording medium is preferably 10 mg / inch ² or less, more preferably 5 mg / inch ² or less, and further preferably 3 mg / inch ² or less.

-Heating process-
The inkjet recording method according to the present embodiment may include a heating step of heating the recording medium 10 before the ink adhesion step or at the same time as the ink adhesion step, and is performed on the recording medium 10 heated by the heating step. Is preferable. The heating step preferably includes an IR heater 3, a platen heater 4, and a fan for blowing warm air to a recording medium. By the heating step, the ink can be quickly dried on the recording medium 10 and bleeding is suppressed. In addition, it is possible to form an image having excellent scratch resistance and image quality.

The upper limit of the temperature of the nozzle surface when the ink composition adheres to the recording medium 10 in the ink adhesion step, that is, the maximum temperature during recording may be 55 ° C. or lower, preferably 50 ° C. or lower, 45. It is more preferably ° C. or lower, and even more preferably 40 ° C. or lower. When the temperature of the nozzle surface at the time of adhering the colored ink composition is within the above range, the influence of heat on the inkjet head 2 can be suppressed, and clogging of the inkjet head 2 and the nozzle can be prevented. Further, the lower limit of the temperature of the nozzle surface during inkjet recording is preferably a temperature higher than room temperature, preferably 28 ° C. or higher, more preferably 30 ° C. or higher, and 32 ° C. or higher. Is even more preferable. When the temperature of the nozzle surface during inkjet recording is within the above range, the ink on the recording medium 10 can be quickly dried and fixed at an early stage, bleeding is suppressed, and scratch resistance and image quality are excellent. The image can be formed. The temperature of the nozzle surface when the ink adheres to the recording medium 10 may be raised due to heat generation of a recording device such as the inkjet head 2 itself, or may be affected by the heat of the heating step. It may be the one received.

The heating step of the inkjet recording method of the present embodiment includes a secondary heating step, if necessary.

--Secondary heating process--
The inkjet recording method according to the present embodiment is also referred to as a secondary heating step (also referred to as a “post-heating step”) in which the recording medium 10 to which the ink composition is adhered is heated by the heating heater 5 shown in FIG. 1 after the ink adhesion step. ) May have. As a result, the resin or the like contained in the ink composition on the recording medium 10 is melted to form an ink film, and the ink film is firmly fixed on the recording medium 10 to have excellent film-forming property and to be scratch resistant. High-quality images with excellent properties can be obtained in a short time.

The upper limit of the surface temperature of the recording medium 10 by the heater 5 is preferably 120 ° C. or lower, more preferably 110 ° C. or lower, and even more preferably 100 ° C. or lower. Further, the lower limit of the surface temperature of the recording medium 10 is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, and even more preferably 80 ° C. or higher. When the temperature is within the above range, clogging resistance can be ensured and a high-quality image having excellent scratch resistance can be obtained in a short time.

After the secondary heating step, the cooling fan 6 shown in FIG. 1 may have a step of cooling the ink composition on the recording medium 10.

The recording device according to the present embodiment records on a recording medium using a recording device including a control unit. The control unit determines the residual amount of the organic solvent on the surface of the recorded material in each of the first recording mode for obtaining the recorded material to be used by laminating and the second recording mode for obtaining the recorded material to be used without laminating. Controls the heating of the heating unit so that

The heating conditions set in the first recording mode are such that the residual amount of the organic solvent in the recorded material after heating is larger than the heating conditions set in the second recording mode. As a result, in the first recording mode in which the recorded material to be used by laminating is obtained, the recorded material having excellent laminating adhesion can be obtained, while in the second recording mode in which the recorded material to be used without laminating is obtained. Excellent abrasion resistance can be obtained. In the above-mentioned first recording mode and the second recording mode, a specific value of the residual amount may be set, but the above-mentioned IR heater 3, the platen heater 4, and the fan record the warm air. Depending on the conditions of blowing air to the medium, the residual amount of the organic solvent in the recorded material in the first recording mode should be set to be larger than the residual amount of the organic solvent in the recorded material in the second recording mode. Just do it. When the secondary heating step is provided, the control unit controls the heating in the secondary heating step so that the residual amount of the organic solvent in the recorded material obtained after the heating is within a predetermined range. The heating unit is, for example, a heating heater 5, but may be a mechanism for heating the recording medium, such as a fan or other blowing means, a means for radiating radiation such as IR to the recording medium, or a member in contact with the recording medium to record the recording medium. A conduction means or the like that transfers heat to the heat can be used.

In the control of heating of the heating unit according to the heating conditions, for example, the temperature of heating by the heating unit in the first recording mode may be lower than the temperature of heating by the heating unit in the second recording mode. The heating temperature is, for example, the surface temperature of the recording medium at the time of heating. Alternatively, the heating time by the heating unit in the first recording mode may be shorter than the heating time by the heating unit in the second recording mode. In these cases, it is preferable that the residual amount of the organic solvent in the recorded material in the first recording mode is larger than the residual amount of the organic solvent in the recorded material in the second recording mode.

The residual amount in the first recording mode is preferably 2% by mass or more, more preferably 3% by mass or more, and more preferably 4% by mass or more, more than the residual amount in the second recording mode. With such a residual amount relationship, it tends to be easy to achieve both excellent laminate adhesion and excellent abrasion resistance.

The residual amount of the organic solvent in the recorded material recorded in the first recording mode is preferably 5% by mass or more and 25% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. It is more preferably 6% by mass or more and 20% by mass or less, and more preferably 8% by mass or more and 15% by mass or less. When the residual amount of the organic solvent in the recorded material in the first recording mode is 5% by mass or more and 25% by mass or less, the laminate adhesion can be further improved.

The residual amount of the organic solvent in the second recording mode is preferably 10% by mass or less, more preferably 8% by mass, based on 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. % Or less, more preferably 5% by mass or less. When the residual amount of the organic solvent in the second recording mode is 10% by mass or less, the abrasion resistance can be further improved. The lower limit is not particularly limited, but the residual amount of the organic solvent in the second recording mode is, for example, 1% by mass or more with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium.

The residual amount of the organic solvent is measured after the recorded material after the heating step has returned to room temperature and left for 10 hours. From the recorded material, deposits caused by the composition to which ink or the like is attached per predetermined area of the recorded portion can be collected and analyzed using a TG / DTA and a GC / MS analysis system. The residual amount (mass%) of the organic solvent after heating is calculated from the amount of the organic solvent adhered to the composition such as ink adhered to the predetermined area.

In the recording of the first recording mode, the surface temperature of the recording medium heated by the heating unit is preferably 5 ° C. or more higher than the surface temperature of the recording medium heated by the heating unit in the recording of the second recording mode. , 8 ° C or higher, preferably 5 to 20 ° C higher.

-Treatment liquid adhesion process-
The inkjet recording method of the present embodiment may include a processing liquid adhering step of adhering the processing liquid to the recording medium. The treatment liquid is preferably discharged from the inkjet head. The treatment liquid adhering step is preferably performed before the colored ink adhering step.

The treatment liquid preferably contains a flocculant that agglomerates the components of the ink composition. The treatment liquid agglomerates the components contained in the ink composition by the coagulant interacting with the ink composition, and thickens or insolubilizes the ink composition. As a result, it is possible to suppress landing interference and bleeding of the ink composition to be adhered thereafter, and it is possible to uniformly draw lines, fine images, and the like. When the treatment liquid is used, it is preferable that the flow of the ink on the recording medium can be stopped by aggregating the ink components, and the image quality is excellent even if the evaporation rate of the ink is low. Further, since the image quality is excellent even if the evaporation rate of the ink is low, the evaporation rate of the ink can be lowered, and the reduction of the color difference is excellent and preferable.

--Coagulant--
The flocculant is not particularly limited, and examples thereof include a cationic resin, an organic acid, and a polyvalent metal salt. Among the components contained in the ink composition, examples of the components that are agglutinated by the aggregating agent include the above-mentioned pigments and resins used for resin particles.

The cationic resin is not particularly limited, and for example, polyallylamine resins such as polyethyleneimine, polydiallylamine, and polyallylamine, alkylamine polymers, JP-A-59-20696, JP-A-59-33176, and JP-A-59-33177. No. 59-155088, No. 60-11389, No. 60-49990, No. 60-83882, No. 60-109894, No. 62-198493, No. 63-49478, No. 63-115780, Polymers having a primary amino group and a quaternary ammonium base described in JP-A-63-280681, JP-A-1-40371, JP-A-6-234268, JP-A-7-125411, JP-A-10-193776, etc. Is preferably used. The weight average molecular weight of the cationic resin is preferably 5,000 or more, and more preferably about 5,000 to 100,000. The weight average molecular weight of the cationic resin is measured by gel permeation chromatography using polystyrene as a standard substance.

Among these cationic resins, cationic amine-based resins such as polyallylamine resins, polyamine resins, and polyamide resins are preferable in terms of excellent image quality. The polyallylamine resin, the polyamine resin, and the polyamide resin are resins having a polyallylamine structure, a polyamine structure, and a polyamide structure in the main skeleton of the polymer, respectively.

The organic acid is not particularly limited, but is, for example, a carboxylic acid. The carboxylic acid is not particularly limited, and examples thereof include maleic acid, acetic acid, phosphoric acid, oxalic acid, malonic acid, succinic acid, and citric acid. Of these, monovalent or divalent or higher carboxylic acids are preferable.

The polyvalent metal salt may be a polyvalent metal salt of an inorganic acid or a polyvalent metal salt of an organic acid. The polyvalent metal salt is not particularly limited, but for example, an alkaline earth metal of Group 2 in the periodic table (for example, magnesium and calcium), a transition metal of the third group in the periodic table (for example, lantern), and a periodic table. Examples include salts of earth metals (eg, aluminum) from Group 13 of the above, and lanthanides (eg, neodymium). Further, as the salts of these polyvalent metals, carboxylates (for example, formic acid, acetic acid, benzoate), sulfates, nitrates, chlorides, and thiocyanates are suitable. Among them, polyvalent metal salts include calcium or magnesium salts of carboxylic acids (artic acid, acetic acid, benzoate, etc.), calcium or magnesium salts of sulfuric acid, calcium or magnesium salts of nitrate, calcium chloride, magnesium chloride, etc. It is preferably a calcium salt or a magnesium salt of thiosian acid.

The content of the flocculant is preferably 0.1% by mass or more and 25% by mass or less, more preferably 1% by mass or more and 25% by mass or less, and further preferably 1% by mass with respect to the total mass of the treatment liquid. % Or more and 20% by mass or less, more preferably 1% by mass or more and 10% by mass or less, and even more preferably 1% by mass or more and 7% by mass or less. When the content of the coagulant is within the above range, a recorded material having better image quality tends to be obtained.

The treatment liquid used in the present embodiment may contain the same surfactant, water-soluble organic solvent and water as used in the above-mentioned ink composition independently of the ink composition. In addition, the treatment liquid captures other components such as dissolution aids, viscosity regulators, pH regulators, antioxidants, preservatives, fungicides, corrosion inhibitors, and metal ions that affect dispersion. Various additives such as the chelating agent of the above can be added as appropriate.

-Other processes-
The recording method according to the present embodiment is by means other than the pressure generating means for ejecting and recording ink, that is, by a mechanism other than the mechanism for ejecting ink for recording provided in the inkjet head 2. , The cleaning step for discharging the ink composition and the treatment liquid may be provided.

Examples of the mechanism for ejecting ink for recording included in the inkjet head 2 include a piezo element and a heater element provided in a pressure chamber (not shown) to apply pressure to the ink. This cleaning step may be a step of applying pressure to the inkjet head 2 from the outside to discharge the ink composition or the treatment liquid from the nozzle. By providing this step, even when there is a concern that the resin is welded to the inner wall of the inkjet head 2, this can be suppressed and the ejection stability can be further improved.

Examples of the other mechanism described above include a mechanism for applying a negative pressure, a mechanism for applying a positive pressure from the upstream of the inkjet head, and the like. These are not ink ejection, that is, flushing, due to the function of the inkjet head itself. That is, it is not the discharge using the function of ejecting ink from the inkjet head at the time of recording.

In addition to each of the above steps, the inkjet recording method of the present embodiment may have known steps of the conventional inkjet recording method.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited to the following examples.

-Preparation of ink composition-
Each material was mixed with the composition shown in Table 1 below and sufficiently stirred to obtain each ink composition. Specifically, each ink was prepared by uniformly mixing each material and removing insoluble matter with a filter. In Table 1 below, the unit of the numerical value is mass%, and the total is 100.0 mass%.

PB 15: 3: C.I. I. Pigment Blue 15: 3
BYK-348: Silicone-based surfactant "BYK-348" (product name, manufactured by Big Chemie Japan Co., Ltd.)
S-242: Fluorine-based surfactant "Surflon S-242" (product name, manufactured by AGC Seimi Chemical Co., Ltd.)
E1010: Acetylene glycol-based surfactant "Orphin E1010" (product name, manufactured by Nissin Chemical Industry Co., Ltd.)
62J: Styrene-acrylic resin emulsion "John Krill 62J" (product name, manufactured by BASF)
AQ515: Oxidized high-density polyethylene wax "AQUACER 515" (product name, manufactured by Big Chemie Japan Co., Ltd.)
AQ537: Mixed wax "AQUACER 537" (product name, manufactured by Big Chemie Japan Co., Ltd.)

-Inkjet recording device-
A serial printer modified from "SC-S80650" manufactured by Seiko Epson Corporation was used. The surface temperature on the media recording side (maximum temperature during recording) at a position opposite to the head when the platen heater was operated during recording was 35 ° C. Secondary heating was performed by a secondary drying mechanism located downstream of the head. For the secondary heating, the media temperature (maximum temperature) was set as the value in the table, and the heating time was adjusted so as to have the residual amount of the organic solvent in the table.
The processing liquid head, the colored ink head, and the clear ink head were arranged in this order on the carriage from the upstream side in the media transport direction, and adhered in this order.
Coating weight, color ink 5 mg / inch ^2, the clear ink 1 mg / inch ^2, and the treatment liquid 1 mg / inch ^2. The three liquids were recorded in order.
However, in the example of simultaneous printing of clear ink, the heads of the colored ink and the clear ink were arranged side by side at the same position in the transport direction, and adhered to the same region of the transport traveling in the same main scan.
The head had a nozzle density of 600 dpi in the nozzle row.
The recording pattern was a rectangular solid pattern. However, the filling evaluation was a line pattern.

-Inkjet recording method (Test Examples 1 to 21)-
Using the above-mentioned modification machine, any one of the ink compositions prepared above is ejected by an inkjet method under the printing conditions shown in Tables 2 and 3, and the recording medium “U40-10” (product name, product name,) under the above-mentioned conditions. A recording pattern was attached to a polyolefin film (manufactured by 3M Ltd.). Then, it was dried under the drying conditions shown in Tables 2 and 3, and the amount of residual solvent shown in Tables 2 and 3 was used. Subsequently, in Tables 2 and 3, when there was a laminate, a laminate resistance test described later was performed.

-Measurement method-
--Amount of residual solvent--
The total amount of the organic solvent of each ejected ink composition was 100 parts by mass. After the secondary drying, the recorded material returned to room temperature, and the residual organic solvent of the recorded material was measured after being left for 10 hours. For the amount of residual organic solvent, a part of the applied ink was taken out, and the TG / DTA and GC / MS analysis system (manufactured by Hitachi High-Tech Science Corporation, TG / DTA device name: STA7200, GC / MS device name: SCION SQ Select 436). -GC) was used for measurement.

-Evaluation method-
--Abrasion resistance--
A friction element to which a white cotton cloth (JIS L 0803 compliant) is attached to the surface of a recording medium on which an image is recorded by a Gakushin type abrasion resistant tester "AB-301" (product name, manufactured by Tester Sangyo Co., Ltd., load 200 g). Rubbed 50 times. Even when the lamination was "yes", the test was performed on the recording medium before the lamination. The degree of peeling of the image on the surface of the recording medium was visually observed according to the following evaluation criteria.
Evaluation Criteria A: The image does not come off.
B: Peeling of the image was observed in 3% or less of the area of the rubbed part.
C: Peeling of the image was observed in more than 3% and 10% or less of the area of the rubbed portion.
D: The image was peeled off in more than 10% of the area of the rubbed part.

--Blocking property--
The back surface of the same type of recording medium was placed on the recording surface of the recorded material, and the mixture was left for 30 hours in an environment of a temperature of 30 ° C. and a relative humidity of 65% while applying a load of ^{700 g / cm 2.} Even when the lamination was "yes", the test was performed on the recording medium before the lamination. After being left to stand, the printed surface of the recorded material and the recording medium were peeled off, and the peeling of the image and the transfer to the back surface of the recording medium were visually observed according to the following criteria.
Evaluation Criteria A: No peeling is observed on the recording surface, and no image transfer is observed on the back surface side of the recording medium.
B: No peeling is observed in the image on the recording surface, but a slight ink color is observed on the back surface side of the recording medium.
C: Peeling is observed in the image on the recording surface.

--Laminate adhesion--
A 20 cm wide laminated film "8038G" (product name, manufactured by 3M Ltd.) was attached to the recording surface. The pasted record was stored at 30 ° C. for 10 days. Then, the edge of the laminated film was peeled off, and the edge was peeled off by applying a load of 50 g in the direction perpendicular to the width direction of the laminated film and in the opposite direction parallel to the recording surface of the recording medium. The evaluation was performed according to the following criteria.
Evaluation Criteria A: Does not come off.
B: It peeled off with a length of 1 cm or less.
C: More than 1 cm and less than 3 cm peeled off.
D: It peeled off more than 5 cm.

--Rules--
A 1-dot ruled line was recorded, the line was observed with a loupe, and the evaluation was made according to the following evaluation criteria.
Evaluation Criteria A: No unevenness is seen in the outline of the line.
B: Some unevenness is seen in the outline of the line.
C: There is considerable unevenness in the outline of the line.

--Solid image quality--
The recorded part was visually observed and evaluated according to the following evaluation criteria.
Evaluation Criteria A: There is no visible shading unevenness in the solid image.
B: Some shading unevenness of the solid image can be seen.
C: The unevenness of the solid image is conspicuous.

In Tables 2 and 3, "after coloring" in the order of clear adhesion means that the clear ink composition is adhered after the coloring ink composition is adhered, and "simultaneous" means that the coloring ink composition and the clear ink are adhered. It means that the composition was attached at the same time.

As described above, according to the test examples, the test examples shown in Table 2 have better laminate adhesion when the recorded material to be used is obtained by laminating as compared with the test examples shown in Table 3, and further, without laminating. It can be seen that excellent abrasion resistance can be obtained when the recorded material used in the above is obtained, and it is understood that the problem can be solved by the recording device and the recording method of the present embodiment.

1 ... Inkjet recording device, 2 ... Inkjet head, 3 ... IR heater, 4 ... Platen heater, 5 ... Heating heater, 6 ... Cooling fan, 7 ... Preheater, 8 ... Ventilation fan, 9 ... Carriage, 10 ... Recording medium, 11 ... Platen, 13 ... Carriage movement mechanism, 14 ... Transport means, CONT ... Control unit

Claims (15)

A recording device that records on a recording medium.
An ink adhering part that adheres the ink composition to the recording medium,
A heating unit that heats the recording medium to which the ink composition is attached, and a heating unit.
With a control unit
The ink composition is a water-based ink composition containing an organic solvent.
The control unit sets heating conditions for each of the first recording mode for obtaining a recorded material to be used by laminating and the second recording mode for obtaining a recorded material to be used without laminating. Depending on the conditions, the heating by the heating unit is controlled, and the residual amount of the organic solvent after heating by the heating unit in the recording performed by the first recording mode is the heating of the recording performed by the second recording mode. A recording device in which the amount of the organic solvent remaining after heating by the unit is larger than that of the organic solvent. The recording apparatus according to claim 1, wherein the ink composition contains a wax, a silicone-based surfactant or a fluorine-based surfactant. The recording device according to claim 1 or 2, wherein the ink adhering portion is an inkjet head that ejects the ink composition. The recording device according to any one of claims 1 to 3, wherein the ink composition contains 0.5% by mass or more and 4% by mass or less of wax with respect to the total mass of the ink composition. The invention according to any one of claims 1 to 4, wherein at least one of the ink composition in the first recording mode and the ink composition in the second recording mode contains a clear ink composition containing a resin. The recording device described. Any one of claims 1 to 5, wherein at least one of the ink composition in the first recording mode and the ink composition in the second recording mode contains a colored ink composition containing a coloring material. The recording device described in. The recording apparatus according to any one of claims 1 to 6, wherein the ink composition in the second recording mode contains a clear ink composition containing a resin. The recording apparatus according to any one of claims 1 to 7, wherein the recording medium is a polyolefin film. The recording apparatus according to any one of claims 1 to 8, further comprising a treatment liquid adhering portion for adhering a treatment liquid containing a flocculant to the recording medium. The total content of wax, silicone-based surfactant, and fluorine-based surfactant in the ink composition is 0.5% by mass or more and 6.0% by mass or less with respect to the total mass of the ink composition. The recording device according to any one of claims 1 to 9. The residual amount set in the first recording mode is 5% by mass or more and 25% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium.
Claims 1 to 1, wherein the residual amount set in the second recording mode is 10% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. The recording device according to any one of 10. The recording device according to any one of claims 1 to 11, wherein the residual amount in the first recording mode is increased by 2% by mass or more from the residual amount in the second recording mode. A recording method for recording on a recording medium using a recording device including a control unit.
An ink adhesion process for adhering an ink composition to a recording medium,
A heating step of heating the recording medium to which the ink composition is attached is included.
The ink composition is a water-based ink composition containing an organic solvent.
The control unit sets heating conditions for each of the first recording mode for obtaining a recorded material used by laminating and the second recording mode for obtaining a recorded material used without laminating. The heating by the heating unit is controlled according to the heating conditions, and the residual amount of the organic solvent after heating by the heating unit in the recording performed by the first recording mode is the recording performed by the second recording mode. , More than the residual amount of the organic solvent after heating by the heating part,
A recording method in which recording is performed in either the first recording mode or the second recording mode. It is a recording device that obtains a recorded material to be used by laminating by recording on a recording medium.
An ink adhering part that adheres the ink composition to the recording medium,
A heating unit that heats the recording medium to which the ink composition is attached, and a heating unit.
With a control unit
The ink composition is a water-based ink composition containing an organic solvent.
The control unit
By controlling the heating of the recording medium by the heating unit,
The residual amount of the organic solvent after heating by the heating unit is 5% by mass or more and 25% by mass or less with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. , Recording device. It is a recording method that obtains a recorded material to be used by laminating by recording on a recording medium.
An ink adhesion process for adhering an ink composition to a recording medium,
A heating step of heating the recording medium to which the ink composition is attached is included.
The ink composition is a water-based ink composition containing an organic solvent.
The residual amount of the organic solvent after heating of the recording medium in the heating step is 5% by mass or more and 25% by mass with respect to 100% by mass of the total amount of the organic solvent contained in the ink composition adhering to the recording medium. A recording method that is less than or equal to%.