WO2017119040A1 - インクジェット記録装置及びインクジェット記録方法 - Google Patents
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
- B41M5/0017—Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2002/012—Ink jet with intermediate transfer member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/06—Lithographic printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/0256—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet the transferable ink pattern being obtained by means of a computer driven printer, e.g. an ink jet or laser printer, or by electrographic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/03—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by pressure
Definitions
- the present invention relates to an ink jet recording apparatus and an ink jet recording method.
- an image is formed by applying a liquid composition (ink) containing a color material directly or indirectly onto a recording medium such as paper.
- the recording medium may curl or cockling due to excessive absorption of the liquid component in the ink.
- a method of drying the recording medium using means such as warm air or infrared, or an image is formed on the transfer body, and then included in the image on the transfer body
- a method of transferring an image to a recording medium such as paper after the liquid component is dried by heat energy or the like is a method of transferring an image to a recording medium such as paper after the liquid component is dried by heat energy or the like.
- Patent Document 1 a method of removing the liquid component from the ink image by contacting the roller-like porous body with the ink image without using thermal energy.
- Patent Document 2 a method of removing the liquid component from the ink image by contacting the roller-like porous body with the ink image without using thermal energy.
- the liquid component from the image When removing the liquid component from the image by bringing the porous body into contact with the image, the liquid component is efficiently removed from the image, and the color material constituting the image adheres to the surface of the porous body. It is necessary to suppress degradation in image quality. If the liquid component from the image cannot be removed efficiently when the porous body is brought into contact with the image, a part of the liquid, color material, solid content other than the color material, etc. in the ink is pushed away to the rear end side of the image. So-called “image flow” is likely to occur.
- Patent Document 1 a metal porous body (a material obtained by sintering alumina particles) is used as an absorbing material for a roller-like porous body in a solvent removal section that removes a solvent of an ink image.
- Patent Document 1 does not disclose a configuration of a porous body for achieving both suppression of coloring material adhesion to the absorbing material and efficient removal of a liquid (solvent) component from an image.
- the ink absorber used in Patent Document 2 covers at least part of the surface of the liquid solvent absorber that absorbs the liquid solvent of the ink and the ink and has a releasability from the ink colorant. And a release member that transmits the liquid solvent of the ink.
- the release member suppresses the adhesion of the ink colorant to the liquid solvent absorber, the permeability of the liquid solvent component of the ink in the release member is not sufficient depending on the material of the release member. In some cases, the absorption and removal efficiency of the liquid solvent component from the image cannot be improved.
- An object of the present invention is to make ink jet recording capable of removing liquid components from an image and suppressing adhesion of a color material constituting the image to the porous body by bringing the porous body into contact with the image.
- An apparatus and an ink jet recording method are provided.
- the ink jet recording method includes: An image forming step of forming a first image containing an aqueous liquid component and a color material by applying an ink containing a color material and a reaction liquid that thickens the ink on a recording material; The first surface of the porous body having water repellency of the liquid absorbing member is brought into contact with the first image on the recording medium to absorb at least a part of the aqueous liquid component from the first image.
- a liquid absorption process An ink jet recording method comprising: The first surface further has a wetting treatment step of applying a wetting liquid having a contact angle with respect to the first surface of less than 90 ° and performing a wetting treatment; In the liquid absorption step, the first image wetted by the wet treatment step is brought into contact with the first image.
- the inkjet recording method includes: An image forming step of forming a first image containing an aqueous liquid component and a color material by applying an ink containing a color material and a reaction liquid that thickens the ink on a recording material; A liquid-absorbing step of bringing the first surface of the porous body having water repellency of the liquid-absorbing member into contact with the first image of the recording medium and condensing the ink constituting the first image; An ink jet recording method comprising: The first surface further has a wetting treatment step of applying a wetting liquid having a contact angle with respect to the first surface of less than 90 ° and performing a wetting treatment; In the liquid absorption step, the first image wetted by the wet treatment step is brought into contact with the first image.
- An ink jet recording apparatus includes: An image forming unit that forms a first image containing an aqueous liquid component and a color material by applying an ink containing a color material and a reaction liquid that thickens the ink on a recording material; A first surface having water repellency, and bringing the first surface into contact with the first image on the recording medium, thereby removing at least a part of the aqueous liquid component from the first image.
- An ink jet recording apparatus comprising: The first surface further includes a wetting treatment unit that applies a wetting liquid having a contact angle of less than 90 ° to the first surface to the first surface to perform a wetting treatment. It is characterized by that.
- the inkjet recording apparatus is An image forming unit that forms a first image containing an aqueous liquid component and a color material by applying an ink containing a color material and a reaction liquid that thickens the ink on a recording material; A porous body that has a water-repellent first surface and that concentrates ink constituting the first image by bringing the first surface into contact with the first image on the recording medium.
- An ink jet recording apparatus comprising: a liquid absorbing member having: The first surface further includes a wetting treatment unit that applies a wetting liquid having a contact angle of less than 90 ° to the first surface to the first surface to perform a wetting treatment.
- An ink jet recording apparatus comprising: a liquid absorbing member having: The first surface further includes a wetting treatment unit that applies a wetting liquid having a contact angle of less than 90 ° to the first surface to the first surface to perform a wetting treatment.
- ink jet recording capable of removing a liquid component from an image and suppressing adhesion of a color material constituting the image to the porous body by bringing the porous body into contact with the image.
- An apparatus and an ink jet recording method can be provided.
- FIG. 1 is a schematic diagram illustrating an example of a configuration of a transfer type inkjet recording apparatus according to an embodiment of the present invention. It is a schematic diagram which shows an example of a structure of the direct drawing type inkjet recording device in one Embodiment of this invention. It is an enlarged view of the dampening liquid application part by the dampening liquid application member of a roller pressurization method to the liquid absorption member.
- FIG. 5 is a block diagram showing a control system for the entire apparatus in the ink jet recording apparatus shown in FIGS.
- FIG. 4 is a block diagram of a printer control unit in the transfer type inkjet recording apparatus shown in FIG. 3.
- FIG. 5 is a block diagram of a printer control unit in the direct drawing type inkjet recording apparatus shown in FIG. 4.
- An ink jet recording method includes an image forming process for forming a first image containing an aqueous liquid component and a color material on a recording medium, that is, an image to be processed that is a target of liquid absorption processing, A liquid absorption step of absorbing at least a part of the aqueous liquid component from the image by bringing the porous body of the liquid absorption member into contact with the first image.
- Application of ink containing a color material to a recording medium is performed by an ink jet method.
- the liquid-absorbing member has a water-repellent porous body that absorbs aqueous liquid components.
- the porous body has a first surface as a contact surface in contact with the first image. At least a part of the aqueous liquid component contained in the first image is absorbed by the porous body through the first surface of the porous body.
- the ink jet recording method further includes a wetting process step in which a wetting liquid having a contact angle with respect to the first surface of less than 90 ° is applied to the first surface of the porous body. Then, by bringing the first surface wetted by the wet treatment step into contact with the first image, the aqueous liquid is transferred from the first image through the first surface of the porous body to which the wetting liquid is applied. A liquid absorption step is performed to absorb the components.
- the wetting treatment for applying the wetting liquid to the first surface of the porous body is preferably performed by at least one of the following methods.
- a method of performing a wetting treatment on the first surface of the porous body by storing the wetting liquid in the housing portion and supplying the wetting liquid from the housing portion to the first surface of the porous body.
- a method of performing a wetting treatment on the first surface of the porous body by supplying a wetting liquid to the first surface of the porous body.
- the image forming step preferably includes a step of applying a reaction liquid to the recording medium and a step of applying ink to the recording medium. At this time, the region to which the reaction liquid is applied and the region to which ink is applied overlap at least partially on the recording medium. That is, it is preferable to form the first image by bringing the reaction liquid and ink into contact with each other on the recording medium. Further, the order of the step of applying the reaction liquid to the recording medium and the step of applying the ink to the recording medium are not particularly limited, but from the viewpoint of improving the image quality, the image forming process is performed on the recording medium. It is preferable to have a step of applying the liquid and a step of applying the ink to the recording medium in this order. That is, the image forming step includes a step of applying a reaction liquid to the recording medium, and a step of applying ink to the recording medium so that at least part of the area where the reaction liquid is applied is overlapped. It is preferable.
- An inkjet recording apparatus used in an inkjet recording method includes at least an image forming unit that forms a first image containing an aqueous liquid component and a color material on a recording medium, and a first surface having water repellency. And a liquid absorbing member having a porous body that absorbs at least a part of the aqueous liquid component from the first image by bringing the first surface into contact with the first image. .
- the image forming unit also includes a reaction liquid applying unit that applies a reaction liquid onto the recording medium, and an ink jet recording unit that applies ink containing a color material onto the recording medium.
- the ink jet recording apparatus further includes a wetting unit that applies a wetting liquid having a contact angle of less than 90 ° to the first surface of the porous body to the first surface of the porous body to perform a wetting process.
- a wetting unit that applies a wetting liquid having a contact angle of less than 90 ° to the first surface of the porous body to the first surface of the porous body to perform a wetting process.
- the configuration of the wet treatment unit it is preferable to use at least one of the following configurations.
- A The structure which has an accommodating part which accommodates a wetting liquid, and a wetting liquid provision part which supplies a wetting liquid to the 1st surface of a porous body from an accommodating part.
- B When the aqueous liquid component contained in the first image has a function as a wetting liquid, and the first surface of the porous body comes into contact with the first image, the porous body is obtained from the first image.
- the region where the first image is formed on the recording medium is
- At least a part of the aqueous liquid component is removed from the first image by bringing the porous body of the liquid absorbing member into contact with the first image containing the aqueous liquid component and the color material on the recording medium.
- the liquid absorbing member that absorbs at least a part of the aqueous liquid component from the first image including the aqueous liquid component and the color material has releasability with respect to the color material (that is, affinity for the color material). Need to be low). Therefore, a porous body having a water repellent first surface is used as the porous body. As a result, the first surface of the porous body was brought into contact with the first image for liquid absorption treatment, and then the first surface was peeled from the image to reduce the content of the aqueous liquid component. When the image is obtained, adhesion of the coloring material to the porous body can be suppressed.
- the surface free energy of the porous material and the surface free energy of the coloring material (or the aggregate composed of the coloring material and resin) The relationship can be considered. The closer the surface free energy of the two materials, the easier the two materials will adhere.
- a water repellent substance has a lower surface free energy than a hydrophilic substance. For this reason, the use of a water-repellent porous material has increased the difference in surface free energy between the porous material and the color material, and it is assumed that the adhesion of the color material to the porous material could be suppressed. is doing.
- the wetted liquid impregnated region has good wettability to the aqueous liquid component contained in the first image.
- the aqueous liquid component of the first image can be absorbed into the water-repellent porous body via the wet liquid impregnation region with improved wettability to the aqueous liquid component. Therefore, efficient liquid absorption treatment can be performed on the water-repellent porous body.
- FIG. 1 is a schematic diagram showing a state before the first surface of the porous body wetted with the wetting liquid is brought into contact with the first image.
- FIG. 2 is a schematic view showing a state when the first surface of the porous body wetted with the wetting liquid is brought into contact with the first image.
- 1 is a water-repellent porous body
- 2 is a wetting liquid
- 3 is a first image
- 4 is a recording medium
- 5 is an aqueous liquid component
- 6 is a second image.
- the wetting liquid 2 is held on the first surface of the porous body 1, which is the surface in contact with the first image 3. Since the wetting liquid 2 has a contact angle with respect to the first surface of the porous body 1 of less than 90 °, the first surface that is water repellent can be moistened.
- the present inventors presume as follows. Even if the porous body 1 is brought into contact with the first image 3 without being wetted with the wetting liquid 2, the first image 3 has a water repellent property because the first surface of the porous body is water repellent. Therefore, it becomes difficult for the porous liquid 1 to absorb the aqueous liquid component. On the other hand, as in the present invention, the first surface of the porous body 1 is moistened with the wetting liquid 2, so that the water-repellent porous body passes through the wetting liquid and the aqueous liquid component in the first image. It is thought that it became possible to absorb.
- the porous body having water repellency is a porous body having a water contact angle of 90 ° or more. That is, the contact angle of water with respect to the contact surface (first surface) with the first image of the water repellent porous body is also 90 ° or more.
- the image forming unit includes an aqueous liquid component and a color material by applying an ink containing a color material on a recording medium and a reaction liquid that thickens the ink.
- the image forming unit is preferably 1) an apparatus constituting a reaction liquid applying unit for applying a reaction liquid onto the recording medium; and 2) an ink for applying an ink containing an aqueous liquid medium and a coloring material onto the recording medium. And an apparatus constituting the applicator.
- the first image is an ink image before liquid removal before being subjected to a liquid absorption process
- the second image is a liquid absorption process that reduces the content of the aqueous liquid component.
- This is an ink image after removal of the liquid.
- the first image is formed by applying the reaction liquid and the ink to the recording medium so that they have at least an overlapping region.
- the fixability of the color material applied together with the ink on the recording medium by the reaction liquid is improved.
- This improvement in the fixing property of the color material is caused by a decrease in the fluidity of the color material of the ink itself or in the ink due to the action of the reaction liquid from the initial state where the ink applied to the recording medium has fluidity. In other words, it means a fixed state that is difficult to flow compared to the initial state. It can be expressed that the ink is viscous. The mechanism will be described later.
- the first image is formed including a mixture of reaction liquid and ink.
- the ink contains an aqueous liquid medium containing water, and the reaction liquid may contain an aqueous liquid medium containing water as necessary.
- the first image obtained from these liquid compositions contains an aqueous liquid component containing water supplied from these aqueous liquid media together with the coloring material.
- the ink is an ink containing a color material
- the apparatus for applying the ink onto the recording medium is an ink jet recording device.
- the reaction liquid includes a component that chemically or physically reacts with the ink to make the mixture of the reaction liquid and the ink more viscous than each of the reaction liquid and the ink, thereby improving the fixing property of the coloring material. be able to.
- the reaction liquid can contain an aqueous liquid medium.
- the aqueous liquid medium includes at least water, and includes a water-soluble organic solvent and various additives as necessary.
- At least one of the reaction liquid and the ink may contain a second liquid other than that when water is used as the first liquid.
- the volatility of the second liquid is not limited, it is preferably a liquid having higher volatility than the first liquid.
- reaction liquid application device is used as the reaction liquid application unit
- ink application device is used as the ink application unit.
- a process of pre-wetting the porous body with a wetting liquid will be described as a pretreatment for the porous body used for the liquid absorbing member.
- the reaction liquid applying device may be any device that can apply the reaction liquid onto the recording medium, and various conventionally known devices can be appropriately used. Specific examples include a gravure offset roller, an inkjet head, a die coating device (die coater), a blade coating device (blade coater), and the like.
- the application of the reaction liquid by the reaction liquid application device may be performed before or after the ink application, as long as it can be mixed (reacted) with the ink on the recording medium. Preferably, the reaction liquid is applied before applying the ink.
- the reaction liquid contains a component for increasing the viscosity of the ink (ink viscosity increasing component).
- increasing the viscosity of the ink means that the coloring material or resin, which is a component of the ink, reacts chemically or physically adsorbs by contacting the increased viscosity component of the ink.
- the increase in the ink viscosity is recognized.
- the viscosity of the ink not only when an increase in the ink viscosity is observed, but also when the viscosity of the ink locally increases due to agglomeration of a part of the components constituting the ink such as a coloring material and a resin. included.
- This ink viscosity-increasing component reduces the fluidity of a part of the ink and / or the component constituting the ink on the recording medium, thereby suppressing bleeding and beading during the first image formation. effective.
- increasing the viscosity of the ink is also referred to as “viscosity of the ink”.
- an ink viscosity increasing component known ones such as polyvalent metal ions, organic acids, cationic polymers, and porous fine particles can be used. Of these, polyvalent metal ions and organic acids are particularly suitable. It is also preferable to include a plurality of types of ink thickening components.
- the content of the ink viscosity increasing component in the reaction liquid is preferably 5% by mass or more based on the total mass of the reaction liquid.
- polyvalent metal ions examples include divalent metal ions such as Ca 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Sr 2+ , Ba 2+ and Zn 2+ , Fe 3+ , Cr 3+ , Y 3+ and Al 3+. Of the trivalent metal ions.
- organic acids examples include oxalic acid, polyacrylic acid, formic acid, acetic acid, propionic acid, glycolic acid, malonic acid, malic acid, maleic acid, ascorbic acid, levulinic acid, succinic acid, glutaric acid, glutamic acid, and fumaric acid.
- the reaction liquid can contain an appropriate amount of water or a low-volatile organic solvent as an aqueous liquid medium.
- the water used in this case is preferably water deionized by ion exchange or the like.
- it does not specifically limit as an organic solvent which can be used for the reaction liquid applied to this invention A well-known organic solvent can be used.
- the reaction liquid by appropriately adjusting the surface tension and viscosity by adding a surfactant or a viscosity modifier.
- the material used is not particularly limited as long as it can coexist with the ink thickening component.
- surfactants include acetylene glycol ethylene oxide adduct (“acetyleneol E100”, Kawaken Fine Chemical Co., Ltd., trade name), perfluoroalkylethylene oxide adduct (“Megafac F444”, DIC Corporation, trade name, “Capstone FS-3100” The Chemours Company LLC, trade name, Zonyl FS3100 DuPont brand name, etc.) fluorinated surfactant, polyether modified polydimethylsiloxane adduct (“BYK 349”, BYK brand name) silicone surfactant Etc.
- the aqueous liquid component obtained by making a reaction liquid act on an ink can be utilized as a wetting liquid.
- the composition of the ink and / or the reaction liquid is adjusted so that the contact angle of the mixture (aqueous liquid component) with respect to the first surface of the water-repellent porous material is less than 90 °.
- the contact angle of this mixture can be adjusted by selecting the type and amount of surfactant added to the ink and / or reaction liquid.
- An ink jet head is used as an ink application device for applying ink.
- an inkjet head for example, an ink is ejected by forming a bubble by causing film boiling in the ink by an electro-thermal converter, a form in which the ink is ejected by an electro-mechanical converter, and ink is discharged using static electricity. The form etc. which discharge are mentioned.
- a known inkjet head can be used. Among these, those using an electro-thermal converter are preferably used from the viewpoint of high-speed and high-density printing. Drawing receives an image signal and applies a necessary ink amount to each position.
- the ink application amount can be expressed by the image density (duty) and the ink thickness.
- the ink application amount (g / m 2) is obtained by multiplying the mass of each ink dot by the application number and dividing by the printing area. ).
- the maximum ink application amount in the image area is an ink application amount applied in an area of at least 5 mm 2 in an area used as information on a recording medium from the viewpoint of removing liquid components in the ink. Show.
- the ink jet recording apparatus of the present invention may have a plurality of ink jet heads in order to apply ink of each color on the recording medium.
- the ink jet recording apparatus has four ink jet heads that eject the four types of ink onto a recording medium, respectively.
- the ink applying device may include an inkjet head that discharges ink (clear ink) that does not contain a color material.
- the color material contained in the ink applied to the present invention preferably contains a pigment.
- a pigment or a mixture of a dye and a pigment as the color material.
- the kind of pigment that can be used as the color material is not particularly limited. Specific examples of the pigment include inorganic pigments such as carbon black; organic pigments such as azo, phthalocyanine, quinacridone, isoindolinone, imidazolone, diketopyrrolopyrrole, and dioxazine. These pigments can be used alone or in combination of two or more as required.
- the type of dye that can be used as the color material is not particularly limited.
- Specific examples of the dye include direct dyes, acid dyes, basic dyes, disperse dyes, food dyes, and the like, and dyes having an anionic group can be used.
- Specific examples of the dye skeleton include an azo skeleton, a triphenylmethane skeleton, a phthalocyanine skeleton, an azaphthalocyanine skeleton, a xanthene skeleton, and an anthrapyridone skeleton.
- the content of the pigment in the ink is preferably 0.5% by mass or more and 15.0% by mass or less, and more preferably 1.0% by mass or more and 10.0% by mass or less with respect to the total mass of the ink. .
- Dispersing agent for dispersing the pigment a known dispersing agent used for ink jet inks can be used.
- a water-soluble dispersant having both a hydrophilic part and a water-repellent part in the structure.
- a pigment dispersant made of a resin obtained by copolymerizing at least a hydrophilic monomer and a water repellent monomer is preferably used.
- a well-known thing is used suitably.
- examples of the water repellent monomer include styrene and other styrene derivatives, alkyl (meth) acrylate, and benzyl (meth) acrylate.
- examples of the hydrophilic monomer include acrylic acid, methacrylic acid, maleic acid and the like.
- the acid value of the dispersant is preferably 50 mgKOH / g or more and 550 mgKOH / g or less. Moreover, it is preferable that the weight average molecular weights of this dispersing agent are 1000 or more and 50000 or less.
- the mass ratio of pigment to dispersant is preferably in the range of 1: 0.1 to 1: 3.
- the ink applied to the present invention may be used by containing various fine particles having no coloring material.
- resin fine particles are preferable because they may be effective in improving image quality and fixability.
- aggregation by the reaction solution may be more effective in improving the fixability, which is more preferable.
- the material of the resin fine particles that can be used in the present invention is not particularly limited, and a known resin can be appropriately used. Specifically, a homopolymer such as polyolefin, polystyrene, polyurethane, polyester, polyether, polyurea, polyamide, polyvinyl alcohol, poly (meth) acrylic acid and its salt, poly (meth) acrylate alkyl, polydiene, or the like And a copolymer obtained by polymerizing a plurality of monomers for producing these homopolymers.
- the weight average molecular weight (Mw) of the resin is preferably in the range of 1,000 to 2,000,000.
- the amount of the resin fine particles in the ink is preferably 1% by mass or more and 50% by mass or less, more preferably 2% by mass or more and 40% by mass or less with respect to the total mass of the ink.
- the resin fine particle dispersion in which the resin fine particles are dispersed in a liquid.
- a dispersion method is not particularly limited, but a so-called self-dispersing resin fine particle dispersion in which a monomer having a dissociable group is homopolymerized or a resin obtained by copolymerizing a plurality of types is preferably used.
- the dissociable group include a carboxyl group, a sulfonic acid group, and a phosphoric acid group
- examples of the monomer having this dissociable group include acrylic acid and methacrylic acid.
- a so-called emulsified dispersion type resin fine particle dispersion in which resin fine particles are dispersed with an emulsifier can also be suitably used in the present invention.
- the emulsifier a known surfactant is preferable regardless of the low molecular weight or high molecular weight.
- the surfactant is preferably a nonionic surfactant or a surfactant having the same charge as the resin fine particles.
- the resin fine particle dispersion used in the embodiment of the present invention preferably has a dispersed particle diameter of 10 nm to 1000 nm, more preferably 50 nm to 500 nm, and more preferably 100 nm to 500 nm. It is further preferable to have It is also preferable to add various additives for stabilization when preparing the resin fine particle dispersion used in the embodiment of the present invention.
- the additive include n-hexadecane, dodecyl methacrylate, stearyl methacrylate, chlorobenzene, dodecyl mercaptan, blue dye (bluing agent), and polymethyl methacrylate.
- cured with an active energy ray in either a reaction liquid or ink.
- a component that is cured by irradiation with active energy rays and becomes insoluble before irradiation is used.
- a general ultraviolet curable resin can be used.
- many UV curable resins are insoluble in water, as a material that can be applied to the water-based ink suitably used in the present invention, the structure has at least an ethylenically unsaturated bond that can be cured by UV rays and is hydrophilic. It is preferable to have a linking group.
- the bonding group for having hydrophilicity examples include a hydroxyl group, a carboxyl group, a phosphoric acid group, a sulfonic acid group and salts thereof, an ether bond, and an amide bond.
- the curing component used in the present invention is preferably hydrophilic.
- active energy rays include ultraviolet rays, infrared rays, and electron beams.
- reaction liquid or the ink contains a polymerization initiator.
- the polymerization initiator used in the present invention may be any compound as long as it is a compound that generates radicals by active energy rays.
- the ink that can be used in the present invention may contain a surfactant.
- the surfactant include acetylene glycol ethylene oxide adduct (acetylene E100, manufactured by Kawaken Fine Chemical Co., Ltd.).
- the amount of the surfactant in the ink is preferably 0.01% by mass or more and 5.0% by mass or less with respect to the total mass of the ink.
- the composition of the reaction solution can be adjusted.
- the contact angle of this mixture can be adjusted by selecting the type and amount of surfactant added to the ink and / or reaction liquid.
- an aqueous ink containing at least water as a liquid medium is used.
- an aqueous pigment ink containing at least a pigment as a coloring material can be used.
- the liquid medium can further contain a water-soluble organic solvent as necessary.
- the water is preferably water deionized by ion exchange or the like.
- the water content in the ink is preferably 30% by mass to 97% by mass with respect to the total mass of the ink, and more preferably 50% by mass to 95% by mass with respect to the total mass of the ink. preferable.
- the type of the water-soluble organic solvent to be used is not particularly limited, and any known organic solvent can be used. Specifically, glycerin, diethylene glycol, polyethylene glycol, polypropylene glycol, ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, thiodiglycol, hexylene glycol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, 2-pyrrolidone, ethanol , Methanol, and the like. Of course, it is also possible to use a mixture of two or more selected from these.
- the content of the water-soluble organic solvent in the ink is preferably 3% by mass or more and 70% by mass or less with respect to the total mass of the ink.
- the ink that can be used in the present invention is a pH adjuster, a rust inhibitor, an antiseptic, an antifungal agent, an antioxidant, an anti-reduction agent, a water-soluble resin, and a neutralizer thereof, as necessary.
- various additives such as a viscosity modifier may be contained.
- ⁇ Liquid absorbing member> At least a part of the aqueous liquid component is absorbed from the first image by bringing it into contact with the liquid absorbing member having a porous body, thereby reducing the content of the liquid component in the first image.
- the contact surface with the first image of the liquid absorbing member is the first surface, and the porous body is disposed on the first surface.
- the porous body in the present invention has water repellency in order to reduce the affinity with the color material contained in the first image (to improve the releasability of the color material).
- the water repellent porous body preferably has a water contact angle of 90 ° or more.
- the contact angle refers to an object at a portion where a measurement liquid (water, wetting liquid, or the like) is dropped onto an object (first surface of the porous body) and the liquid droplet is in contact with the object.
- the present inventor measures the contact angle of the first surface of the porous body in accordance with the technique described in “6. It was. Note that the water used as the measurement liquid is pure water (distilled water).
- the material of the porous body is not particularly limited as long as the contact angle of water is 90 ° or more, but is preferably made of a water repellent resin.
- the water repellent resin is preferably a fluororesin.
- the fluororesin include polytetrafluoroethylene (hereinafter PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), perfluoroalkoxy fluororesin (PFA), Examples thereof include tetrafluoroethylene / hexafluoropropylene copolymer (FEP), ethylene / tetrafluoroethylene copolymer (ETFE), and ethylene / chlorotrifluoroethylene copolymer (ECTFE). These resins may be used singly or in combination of two or more as required, and may have a structure in which a plurality of films are laminated. Of these, polytetrafluoroethylene is preferred
- the porous body preferably has a small pore diameter in order to suppress the adhesion of the ink coloring material, and the pore diameter of the porous body on the side (first surface) in contact with the first image is at least 10 ⁇ m.
- the following is preferable.
- the lower limit of the pore diameter of the porous body is not particularly limited, but may be, for example, 0.02 ⁇ m or more.
- the pore diameter means an average diameter, and can be measured by a known means such as a mercury intrusion method, a nitrogen adsorption method, or an SEM image observation.
- the air permeability can be indicated by a Gurley value defined in JIS P8117, and the Gurley value is preferably 10 seconds or less.
- the lower limit of the Gurley value is not particularly limited, but can be set to 0.1 seconds or more, for example.
- the shape of the porous body is not particularly limited, and examples thereof include a roller shape and a belt shape. However, if the porous body is thinned, the capacity necessary for absorbing the liquid component may not be sufficiently secured, so the porous body can have a multilayer structure.
- the layer that contacts the image on the transfer body may be a porous body, and the layer that does not contact the image on the transfer body may not be a porous body.
- the porous body has a multilayer structure
- the first layer on the side in contact with the first image and the layer laminated on the surface of the first layer opposite to the contact surface with the first image will be described as the second layer.
- the multilayer structure is also expressed in the order of stacking from the first layer.
- the first layer may be referred to as an “absorbing layer” and the second and subsequent layers may be referred to as a “support layer”.
- the above-described water-repellent porous material is used for the first layer.
- These resins can be used singly or in combination of two or more as required, and may have a structure in which a plurality of films are laminated in the first layer.
- the first layer is made of a water repellent material
- the wetting liquid can be impregnated in the first layer by applying it to the first surface of the liquid absorbing member by a coating method or the like.
- the wetting liquid is preferably prepared by mixing a liquid medium containing water with a surfactant or a liquid having a low contact angle with respect to the surface of the first layer. Since the wetting liquid impregnated in the porous body is gradually replaced with the aqueous liquid component absorbed from the first image, the absorption efficiency of the first layer may gradually decrease. For this reason, it is preferable to apply the wetting liquid to the first surface of the porous body of the liquid absorbing member by applying the wetting liquid every predetermined number of times.
- the composition of the reaction liquid and / or ink is adjusted so that the contact angle of the aqueous liquid component contained in the first image with respect to the first surface of the first layer is less than 90 °.
- this aqueous liquid component can be used as a wetting liquid.
- the contact angle of these aqueous liquid components is obtained by adding a surfactant or a liquid having a low contact angle to the first surface of the porous body having water repellency to the reaction liquid and / or ink. Can be adjusted.
- the thickness of the first layer is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and even more preferably 1 ⁇ m or more and 30 ⁇ m or less.
- the film thickness of each layer of the porous body was obtained by measuring film thicknesses at arbitrary 10 points with a straight-forward micrometer OMV_25 (manufactured by Mitutoyo Corporation) and calculating an average value thereof.
- the first layer can be produced by a known thin film porous membrane production method.
- the resin material can be obtained by obtaining a sheet-like material by a method such as extrusion and then stretching it to a predetermined thickness.
- a porous film can be obtained by adding a plasticizer such as paraffin to the material at the time of extrusion molding and removing the plasticizer by heating at the time of stretching.
- the pore diameter can be adjusted by appropriately adjusting the amount of plasticizer to be added, the draw ratio, and the like.
- the second layer is preferably a breathable layer.
- a layer may be a non-woven fabric of resin fibers or a woven fabric.
- the material of the second layer is not particularly limited, but the contact angle with the aqueous liquid component absorbed from the image is the same for the first layer so that the liquid absorbed to the first layer side does not flow backward. It is preferable that the material is lower than that.
- a single material such as polyolefin (polyethylene (PE), polypropylene (PP), etc.), polyurethane, nylon, polyamide, polyester (polyethylene terephthalate (PET), etc.), polysulfone (PSF), or these It is preferably selected from composite materials and the like.
- the second layer is preferably a layer having a larger pore size than the first layer.
- the porous body having a multilayer structure may be composed of three or more layers, and is not limited.
- the layer after the third layer (also referred to as the third layer) is preferably a nonwoven fabric from the viewpoint of rigidity.
- the material the same material as the second layer can be used.
- the liquid absorbing member may include a reinforcing member that reinforces the side surface of the liquid absorbing member in addition to the porous body having the above-described laminated structure. Moreover, you may have a joining member at the time of connecting the longitudinal direction edge part of a elongate sheet-shaped porous body to make a belt-shaped member. As such a material, a non-porous tape material or the like can be used, and it may be arranged at a position or a period not in contact with the image.
- the method for forming the porous body by laminating the first layer and the second layer is not particularly limited. They may be simply overlapped or may be bonded together using a method such as adhesive lamination or heat lamination. From the viewpoint of air permeability, thermal lamination is preferred in the present invention. Further, for example, a part of the first layer or the second layer may be melted and laminated by heating. Alternatively, a fusing material such as hot melt powder may be interposed between the first layer and the second layer and bonded together by heating. When the third layer or more are stacked, they may be stacked at once or sequentially, and the stacking order is appropriately selected. In the heating step, a laminating method is preferred in which the porous body is heated while sandwiching and pressing the porous body with a heated roller.
- a first image is formed on a transfer body as a recording medium
- a second image which is an image after the aqueous liquid component is absorbed by the liquid absorbing member, is recorded on the recording medium.
- examples thereof include an ink jet recording apparatus for transferring, and an ink jet recording apparatus for forming a first image on a recording medium as a recording medium.
- the former ink jet recording apparatus is hereinafter referred to as a transfer type ink jet recording apparatus for convenience
- the latter ink jet recording apparatus is hereinafter referred to as a direct drawing type ink jet recording apparatus for convenience.
- FIG. 3 is a schematic diagram illustrating an example of a schematic configuration of the transfer type inkjet recording apparatus of the present embodiment.
- the transfer type inkjet recording apparatus 100 includes a transfer body 101 that temporarily holds a first image and a second image obtained by removing at least a part of the aqueous liquid component from the first image. Further, the transfer type ink jet recording apparatus 100 transfers the second image onto the recording medium 108 on which the image is to be formed, that is, the recording medium for forming the final image corresponding to the intended application.
- a transfer unit including the member 106 is included.
- the transfer type inkjet recording apparatus 100 of the present invention includes a transfer body 101 supported by a support member 102, a reaction liquid applying device 103 for applying a reaction liquid onto the transfer body 101, and a transfer body 101 to which the reaction liquid is applied.
- a pressing member 106 that transfers the second image on the transfer body from which the liquid component has been removed onto a recording medium 108 such as paper.
- the transfer type inkjet recording apparatus 100 may have a transfer body cleaning member 109 that cleans the surface of the transfer body 101 after the second image is transferred to the recording medium 108.
- the support member 102 rotates around the rotation shaft 102a in the direction of the arrow in FIG.
- the transfer body 101 is moved by the rotation of the support member 102.
- the reaction liquid by the reaction liquid applying apparatus 103 and the ink by the ink applying apparatus 104 are sequentially applied, and a first image is formed on the transfer body 101.
- the first image formed on the transfer body 101 is moved to a position in contact with the liquid absorbing member 105 a included in the liquid absorbing device 105 by the movement of the transfer body 101.
- the liquid absorbing member 105 a of the liquid absorbing device 105 moves in synchronization with the rotation of the transfer body 101.
- the first image formed on the transfer body 101 is in contact with the moving liquid absorbing member 105a. During this time, the liquid absorbing member 105a removes the liquid component from the first image.
- the liquid component contained in a 1st image is removed by passing through the state which contacted this liquid absorption member 105a.
- this liquid absorption member 105a it is preferable that the liquid absorbing member 105a is pressed against the first image with a predetermined pressing force from the viewpoint of effectively functioning the liquid absorbing member 105a.
- the removal of the liquid component is described from a different viewpoint, it can also be expressed as concentrating the ink constituting the image (first image) formed on the transfer body. Concentrating the ink means that the content ratio of the solid component such as a coloring material or resin contained in the ink increases as the liquid component contained in the ink decreases. Then, the image from which the liquid component has been removed (second image) is moved to the transfer unit that is in contact with the recording medium 108 conveyed by the recording medium conveying device 107 by the movement of the transfer body 101. While the second image after the liquid component is removed is in contact with the recording medium 108, the pressing member 106 presses the recording medium 108, whereby the ink image is transferred onto the recording medium 108.
- the post-transfer ink image transferred onto the recording medium 108 is a reverse image of the second image.
- this post-transfer ink image may be referred to as a third image separately from the first image (ink image before liquid removal) and the second image (ink image after liquid removal).
- the reaction liquid since the first image is formed by applying ink after the reaction liquid is applied on the transfer body, the reaction liquid does not react with the ink in the non-image area (non-ink image forming area). Remaining.
- the liquid absorbing member 105a is in contact (pressure contact) with the unreacted reaction liquid as well as from the first image, and the liquid components of the reaction liquid are also removed from the surface of the transfer body 101 together.
- the liquid component is removed from the first image, but this is not a limited meaning that the liquid component is removed only from the first image. It is used in the sense that the liquid component only needs to be removed from the image. For example, it is also possible to remove the liquid component in the reaction solution applied to the outer region of the first image together with the first image.
- the liquid component is not particularly limited as long as it does not have a certain shape, has fluidity, and has a substantially constant volume.
- water, an organic solvent, or the like contained in ink or a reaction liquid can be used as the liquid component.
- the ink can be concentrated by the liquid absorption process.
- the clear ink when the clear ink is applied on the color ink containing the color material applied on the transfer body 101, the clear ink exists entirely on the surface of the first image, or the first ink Clear ink is partially present at one or more locations on the surface of the image, and color ink is present at other locations.
- the porous body absorbs the liquid component of the clear ink on the surface of the first image, and the liquid component of the clear ink moves. Along with this, the liquid component in the color ink moves to the porous body side, so that the aqueous liquid component in the color ink is absorbed.
- the liquid components of the color ink and the clear ink move to the porous body side to absorb the aqueous liquid component.
- the clear ink may contain many components for improving the transferability of the image from the transfer body 101 to the recording medium. For example, the content rate of the component which becomes more adhesive to the recording medium by heating than the color ink is increased.
- the transfer body 101 has a surface layer including an image forming surface.
- various materials such as resin and ceramic can be used as appropriate, but a material having a high compression elastic modulus is preferable in terms of durability and the like.
- Specific examples include condensates obtained by condensing acrylic resins, acrylic silicone resins, fluorine-containing resins, and hydrolyzable organosilicon compounds.
- surface treatment may be performed.
- the surface treatment include flame treatment, corona treatment, plasma treatment, polishing treatment, roughening treatment, active energy ray irradiation treatment, ozone treatment, surfactant treatment, and silane coupling treatment. A plurality of these may be combined. Moreover, arbitrary surface shapes can also be provided in the surface layer.
- the transfer body preferably has a compression layer having a function of absorbing pressure fluctuations.
- the compression layer absorbs deformation, disperses the fluctuation with respect to the local pressure fluctuation, and can maintain good transferability even during high-speed printing.
- the compression layer member include acrylonitrile-butadiene rubber, acrylic rubber, chloroprene rubber, urethane rubber, and silicone rubber.
- the porous rubber material includes a continuous pore structure in which the pores are continuous with each other and an independent pore structure in which the pores are independent from each other. In the present invention, any structure may be used, and these structures may be used in combination.
- the transfer body preferably has an elastic layer between the surface layer and the compression layer.
- various materials such as resin and ceramic can be used as appropriate.
- Various elastomer materials and rubber materials are preferably used in terms of processing characteristics and the like. Specifically, for example, fluorosilicone rubber, phenyl silicone rubber, fluoro rubber, chloroprene rubber, urethane rubber, nitrile rubber, ethylene propylene rubber, natural rubber, styrene rubber, isoprene rubber, butadiene rubber, ethylene / propylene / butadiene copolymer, A nitrile butadiene rubber etc. are mentioned.
- silicone rubber, fluorosilicone rubber, and phenyl silicone rubber are preferable in terms of dimensional stability and durability because they have a small compression set. Further, the change in elastic modulus with temperature is small, which is preferable in terms of transferability.
- each layer surface layer, elastic layer, compression layer
- you may provide the reinforcement layer with a high compression elastic modulus in order to suppress lateral elongation at the time of mounting
- a woven fabric may be used as the reinforcing layer.
- the transfer body can be produced by arbitrarily combining the layers made of the above materials.
- the size of the transfer body can be freely selected according to the target print image size.
- the shape of the transfer body is not particularly limited, and specific examples include a sheet shape, a roller shape, a belt shape, and an endless web shape.
- the transfer body 101 is supported on a support member 102.
- Various adhesives and double-sided tapes may be used as a method for supporting the transfer body.
- the transfer member may be supported on the support member 102 using the installation member by attaching an installation member made of metal, ceramic, resin, or the like to the transfer member.
- the support member 102 is required to have a certain degree of structural strength from the viewpoint of conveyance accuracy and durability.
- metal, ceramic, resin or the like is preferably used.
- aluminum, iron, stainless steel, acetal resin, epoxy resin, polyimide, Polyethylene, polyethylene terephthalate, nylon, polyurethane, silica ceramics, and alumina ceramics are preferably used. It is also preferable to use these in combination.
- the ink jet recording apparatus includes a reaction liquid applying device 103 that applies a reaction liquid to the transfer body 101.
- 3 is a gravure offset having a reaction solution storage unit 103a for storing a reaction solution, and reaction solution application members 103b and 103c for applying the reaction solution in the reaction solution storage unit 103a onto the transfer body 101.
- the case of a roller is shown.
- the ink jet recording apparatus includes an ink applying device 104 that applies ink to the transfer body 101 to which the reaction liquid is applied.
- the reaction liquid and the ink are mixed to form a first image, and the liquid component is absorbed from the first image by the next liquid absorption device 105.
- the liquid absorbing device 105 includes a liquid absorbing member 105 a and a liquid absorbing pressing member 105 b that presses the liquid absorbing member 105 a against the first image on the transfer body 101.
- the pressing member 105b has a cylindrical shape
- the liquid absorbing member 105a has a belt shape
- the belt-shaped liquid absorbing member 105a is pressed against the transfer body 101 by the cylindrical pressing member 105b. It may be a configuration.
- the pressing member 105b has a columnar shape, and the liquid absorbing member 105a has a cylindrical shape formed on the peripheral surface of the columnar pressing member 105b.
- the cylindrical pressing member 105b is a cylindrical liquid absorbing member 105a. May be configured to be pressed against the transfer body.
- the liquid absorbing member 105a is preferably belt-shaped in consideration of the space in the ink jet recording apparatus. Further, the liquid absorbing device 105 having such a belt-shaped liquid absorbing member 105a may have a stretching member that stretches the liquid absorbing member 105a.
- 105c, 105d, and 105e are stretching rollers as stretching members.
- the pressing member 105b is also a roller member that rotates in the same manner as the stretching roller, but is not limited thereto.
- the liquid absorbing member 105a having a porous body is pressed against the first image by the pressing member 105b, so that the liquid absorbing member 105a absorbs the liquid component contained in the first image, and the first image is absorbed.
- the liquid component is removed from the image.
- various other conventionally used methods for example, a method by heating, a method of blowing low-humidity air, a method of reducing pressure Etc. may be combined.
- the temperature in the treatment with the porous body of the liquid absorbing member on the first image by the liquid absorbing device can be set in a range where the target liquid absorbing effect can be obtained.
- the wetting liquid contains a surfactant for adjusting the contact angle
- the temperature at the time of contact between the first surface of the porous body and the first image is determined by the cloud point of the surfactant contained in the wetting liquid. It is preferable to control the temperature below.
- the temperature at the time of contact between the first surface of the porous body and the first image is preferably selected from the range of 5 ° C to 60 ° C.
- the temperature control at the time of contact between the first surface of the porous body and the first image is a temperature control unit having a temperature control unit including a heating unit and a cooling unit to be installed as necessary. It can be performed by arranging according to the configuration of the ink jet recording apparatus. For example, temperature control means can be arranged in the vicinity of the inside of the pressing member 105b shown in FIGS. 3 and 4 or in the vicinity thereof, and temperature control at the time of contact can be performed.
- the heating means and cooling means incorporated in the temperature control unit are not particularly limited, and a known heating device or cooling device can be used.
- the porous body Before the porous body having water repellency comes into contact with the first image, the porous body may be pretreated by a pretreatment means for applying a wetting liquid having a contact angle with the first surface of less than 90 °.
- the wetting liquid is not particularly limited as long as the contact angle with the first surface of the porous body is less than 90 ° and the intended liquid absorbability can be obtained in the porous body.
- the wetting liquid preferably contains an aqueous liquid medium containing at least water and a component for adjusting the surface tension of the wetting liquid. Although there is no restriction
- the surfactant at least one of a silicone surfactant and a fluorine surfactant is preferably used, and a fluorine surfactant is more preferably used.
- the surfactant used include fluorosurfactant F-444 (trade name, manufactured by DIC), Zonyl FS3100 (trade name, manufactured by DuPont), Capstone FS-3100 (trade name, The Chemours Company LLC). And BYK349 (trade name, manufactured by BYK) of a silicone-based surfactant.
- the water is preferably water deionized by ion exchange or the like.
- the type of the water-soluble organic solvent is not particularly limited, and any known organic solvent such as ethanol or isopropyl alcohol can be used.
- the content of the surfactant in the wetting liquid is preferably 0.2% by mass or more, more preferably 0.4% by mass or more, and 0.5% by mass or more with respect to the total mass of the wetting liquid. Particularly preferred.
- the upper limit of the content of the surfactant in the wetting liquid is not particularly limited, but is preferably 10% by mass with respect to the total mass of the wetting liquid from the viewpoint of solubility of the surfactant in the wetting liquid.
- FIG. 5 is an enlarged view of a wetting liquid applying unit that applies a wetting liquid to the liquid absorbing member 105a using a roller pressing type wetting liquid applying member.
- the wetting liquid 110c stored in the wetting liquid container 110a is pumped up by the wetting liquid applying member 110b, and the wetting liquid 110c is pressurized and applied to the liquid absorbing member 105a.
- the timing of applying the wetting liquid is not particularly limited.
- the wetting liquid may be applied every round, or the wetting liquid may be applied once every several cycles.
- the application timing of the wetting liquid may be controlled.
- the wetting liquid applying device may be configured to move up and down using a motor, a cam mechanism, and an air cylinder so as to be able to contact and separate from the liquid absorbing member.
- the wetting liquid as the pretreatment by the pretreatment means for applying the wetting liquid to the porous body of the liquid absorbing member. It is preferable to apply.
- the reaction solution may be used instead of the pre-wetting solution. That is, before bringing the liquid absorbing member 105a into contact with the first image, a reaction liquid having a contact angle with respect to the surface of the liquid absorbing member 105a of less than 90 ° is applied to the transfer body 101, and the reaction liquid on the transfer body 101 is discharged. You may make it transfer to the liquid absorption member 105a and use it as a pre-processing of a porous body.
- the application pressure of the wetting liquid is not particularly limited, but if it is 0.98 N / cm 2 (0.1 kgf / cm 2 ) or more, the application of the wetting liquid should be stable or applied at high speed in the apparatus. Is preferable. Furthermore, applying the pressure of the wetting liquid is not more than 98N / cm 2 (10kgf / cm 2), preferably the load on the structure of the apparatus can be suppressed.
- the pressure of the porous body for pressing against the first image on the transfer member is 2.94N / cm 2 (0.3kgf / cm 2) or more 98N / cm 2 (10kgf / cm 2) or less
- the The liquid component in one image can be solid-liquid separated in a shorter time, and the liquid component can be removed from the first image, which is preferable.
- the pressure is 98 N / cm 2 (10 kgf / cm 2 ) or less because a structural load on the apparatus can be suppressed.
- the contact pressure with respect to the first image of the porous body indicates a nip pressure between the transfer body 101 and the liquid absorbing member 105a, and a surface pressure distribution measuring instrument (I The surface pressure was measured at ⁇ SCAN), and the value in the pressure area was divided by the area to calculate the value.
- the working time for bringing the liquid absorbing member 105a into contact with the first image is preferably within 50 ms (milliseconds) in order to further suppress the coloring material in the first image from adhering to the liquid absorbing member.
- the operation time in this specification is calculated by dividing the pressure sensing width in the moving direction of the recording medium in the surface pressure measurement described above by the moving speed of the recording medium.
- this action time is referred to as a liquid absorption nip time.
- the liquid component is absorbed from the first image on the transfer body 101, and a second image with a reduced liquid content is formed.
- the second image is then transferred onto the recording medium 108 at the transfer portion.
- the transfer pressing member 106 presses the recording medium 108 while the second image and the recording medium 108 conveyed by the recording medium conveying device 107 are in contact with each other. An ink image is transferred on top. By removing the liquid component contained in the first image on the transfer body 101 and then transferring it to the recording medium 108, it is possible to obtain a recorded image in which curling, cockling, and the like are suppressed.
- the pressing member 106 is required to have a certain degree of structural strength from the viewpoint of conveyance accuracy and durability of the recording medium 108.
- the material of the pressing member 106 is preferably metal, ceramic, resin, or the like.
- aluminum, iron, stainless steel, acetal resin, epoxy resin, polyimide, Polyethylene, polyethylene terephthalate, nylon, polyurethane, silica ceramics, and alumina ceramics are preferably used. Moreover, you may use combining these.
- the pressing time in this embodiment indicates the time during which the recording medium 108 and the transfer body 101 are in contact with each other, and the surface pressure is measured with a surface pressure distribution measuring instrument (I-SCAN manufactured by Nitta Corporation). The measurement is performed, and the length in the conveyance direction of the pressurizing region is divided by the conveyance speed to calculate a value.
- I-SCAN surface pressure distribution measuring instrument
- the pressure that the pressing member 106 presses in order to transfer the second image on the transfer body 101 to the recording medium 108 is performed well and the durability of the transfer body is impaired. Do not.
- the pressure is less than 9.8N / cm 2 (1kg / cm 2) or more 294.2N / cm 2 (30kg / cm 2).
- the pressure in the present embodiment indicates the nip pressure between the recording medium 108 and the transfer body 101.
- the surface pressure is measured by a surface pressure distribution measuring device, and the weight in the pressurizing region is divided by the area to obtain a value. Is calculated.
- the temperature at which the pressing member 106 is pressed to transfer the second image on the transfer body 101 to the recording medium 108 is not particularly limited, but it is not less than the glass transition point of the resin component contained in the ink or softened. It is preferable that it is more than a point.
- the heating includes a heating unit that heats the second image on the transfer body 101, the transfer body 101, and the recording medium 108.
- the shape of the transfer means 106 is not particularly limited, and examples thereof include a roller shape.
- the recording medium 108 is not particularly limited, and any known recording medium can be used.
- the recording medium include a long product wound in a roll shape, or a single sheet cut into a predetermined size.
- Examples of the material include paper, plastic film, wood board, cardboard, and metal film.
- the recording medium conveying device 107 for conveying the recording medium 108 is constituted by a recording medium feeding roller 107a and a recording medium take-up roller 107b. It is not limited to.
- FIG. 6 is a block diagram showing a control system of the entire apparatus in the transfer type ink jet recording apparatus shown in FIG.
- 301 is a recording data generation unit such as an external print server
- 302 is an operation control unit such as an operation panel
- 303 is a printer control unit for executing a recording process
- 304 is a recording medium for conveying the recording medium.
- a conveyance control unit 305 is an inkjet device for printing.
- FIG. 7 is a block diagram of a printer control unit in the transfer type inkjet recording apparatus of FIG.
- a CPU 401 controls the entire printer
- a ROM 402 stores a control program for the CPU
- a RAM 403 executes the program.
- Reference numeral 404 denotes an application specific integrated circuit (ASIC) that includes a network controller, a serial IF controller, a head data generation controller, a motor controller, and the like.
- Reference numeral 405 denotes a liquid absorption member conveyance control unit for driving the liquid absorption member conveyance motor 406, which is command-controlled from the ASIC 404 via the serial IF.
- ASIC application specific integrated circuit
- Reference numeral 407 denotes a transfer body drive control unit for driving the transfer body drive motor 408, which is similarly command-controlled from the ASIC 404 via the serial IF.
- Reference numeral 409 denotes a head controller that performs final ejection data generation, drive voltage generation, and the like of the inkjet device 305.
- Reference numeral 410 denotes a lifting / lowering control unit of the wetting liquid application device for driving the lifting / lowering air cylinder 411 of the wetting liquid application device, which is command-controlled from the ASIC 404 via the serial IF.
- the recording medium is a recording medium on which an image is to be formed.
- FIG. 4 is a schematic diagram showing an example of a schematic configuration of the direct drawing type inkjet recording apparatus 200 in the present embodiment.
- the direct drawing type inkjet recording apparatus does not have the transfer body 101, the support member 102, and the transfer body cleaning unit 109, except that an image is formed on the recording medium 208. Means similar to those of the transfer type ink jet recording apparatus are included.
- the reaction liquid applying device 203 for applying the reaction liquid to the recording medium 208 the ink applying device 204 for applying ink to the recording medium 208, and the liquid absorbing member 205a that contacts the first image on the recording medium 208
- the liquid absorbing device 205 that absorbs the liquid component contained in the first image has the same configuration as that of the transfer type inkjet recording device, and a description thereof will be omitted.
- the liquid absorbing device 205 includes a liquid absorbing member 205a and a liquid absorbing pressing member 205b that presses the liquid absorbing member 205a against the first image on the recording medium 208.
- a liquid absorbing member 205a and a liquid absorbing pressing member 205b that presses the liquid absorbing member 205a against the first image on the recording medium 208.
- the liquid absorbing device 205 may have a stretching member that stretches the liquid absorbing member.
- 205c, 205d, 205e, 205f, and 205g are stretching rollers as stretching members.
- the number of stretching rollers is not limited to five in FIG. 4, and a necessary number may be arranged according to the device design.
- an ink applying unit that applies ink to the recording medium 208 by the ink applying device 204, and a position facing the liquid component removing unit that presses the liquid absorbing member 205a against the first image on the recording medium and removes the liquid component.
- a recording medium support member (not shown) that supports the recording medium from below may be provided.
- the recording medium transporting device 207 is not particularly limited, and a transporting device in a known direct drawing type ink jet recording apparatus can be used.
- a recording medium transport apparatus having a recording medium feed roller 207a, a recording medium take-up roller 207b, and recording medium transport rollers 207c, 207d, 207e, and 207f.
- the direct drawing type inkjet recording apparatus in the present embodiment has a control system for controlling each apparatus.
- a block diagram showing a control system of the entire apparatus of the direct drawing type ink jet recording apparatus shown in FIG. 4 is as shown in FIG. 6 as in the case of the transfer type ink jet recording apparatus shown in FIG.
- FIG. 8 is a block diagram of a printer control unit in the direct drawing type ink jet recording apparatus of FIG. Except for not having the transfer body drive control unit 407 and the transfer body drive motor 408, it is the same as the block diagram of the printer control unit in the transfer type inkjet recording apparatus in FIG. That is, a CPU 501 controls the entire printer, 502 a ROM for storing a control program for the CPU, and 503 a RAM for executing the program.
- Reference numeral 504 denotes an ASIC including a network controller, a serial IF controller, a head data generation controller, a motor controller, and the like.
- Reference numeral 505 denotes a liquid absorption member conveyance control unit for driving the liquid absorption member conveyance motor 506, and is command-controlled from the ASIC 504 via the serial IF.
- Reference numeral 509 denotes a head controller that performs final ejection data generation, drive voltage generation, and the like of the inkjet device 305.
- Reference numeral 510 denotes an ascending / descending control unit of the wetting liquid applying apparatus for driving the ascending / descending air cylinder 511 of the wetting liquid applying apparatus, and command control is performed from the ASIC 504 via the serial IF.
- Example 1 the transfer type ink jet recording apparatus shown in FIG. 3 was used.
- the transfer body 101 in this embodiment is fixed to the surface of the support member 102 with an adhesive.
- a sheet obtained by coating a PET sheet having a thickness of 0.5 mm with a silicone rubber (KE12 manufactured by Shin-Etsu Chemical Co., Ltd.) to a thickness of 0.3 mm was used as the elastic layer of the transfer body J.
- glycidoxypropyltriethoxysilane and methyltriethoxysilane were mixed at a molar ratio of 1: 1 to prepare a mixture of a condensate obtained by heating under reflux and a photocationic polymerization initiator (SP150 manufactured by ADEKA).
- SP150 photocationic polymerization initiator
- Atmospheric pressure plasma treatment is performed so that the contact angle of water on the elastic layer surface is 10 ° or less, the mixture is applied onto the elastic layer, UV irradiation (high pressure mercury lamp, accumulated exposure 5000 mJ / cm 2 ), heat A transfer body 101 was formed by forming a film by curing (150 ° C. for 2 hours) and forming a surface layer having a thickness of 0.5 ⁇ m on the elastic layer.
- the ink applicator 204 used an ink jet head that discharges ink by an on-demand method using an electro-thermal conversion element, and formed a solid image on the transfer member.
- the amount of ink applied during the formation of this solid image was 20 g / m 2 .
- the liquid absorbing member 105a is adjusted by the liquid absorbing member conveying rollers 105c, 105d, and 105e so as to have a speed equivalent to the moving speed of the transfer body 101. Further, the recording medium 108 is conveyed by the recording medium feeding roller 107a and the recording medium take-up roller 107b so that the speed is equal to the moving speed of the transfer body 101.
- the conveyance speed was 0.2 m / s
- aurora-coated paper manufactured by Nippon Paper Industries Co., Ltd., basis weight 104 g / m 2 .
- the reaction liquid applied by the reaction liquid applying apparatus 103 was of the following composition.
- the amount of reaction liquid applied by the reaction liquid applying apparatus 103 was 1 g / m 2 .
- the ink was prepared as follows.
- aqueous resin solution styrene-ethyl acrylate-acrylic acid copolymer, acid value 150, weight average molecular weight (Mw) 8,000, resin content 20
- ⁇ Preparation of resin particle dispersion 20 parts of ethyl methacrylate, 3 parts of 2,2′-azobis- (2-methylbutyronitrile) and 2 parts of n-hexadecane were mixed and stirred for 0.5 hour. This mixture was added dropwise to 75 parts of an 8% aqueous solution of a styrene-butyl acrylate-acrylic acid copolymer (acid value: 130 mgKOH / g, weight average molecular weight (Mw): 7,000) and stirred for 0.5 hour. did. Next, the ultrasonic wave was irradiated for 3 hours with the ultrasonic irradiation machine. Subsequently, a polymerization reaction was performed in a nitrogen atmosphere at 80 ° C. for 4 hours, and after cooling at room temperature, filtration was performed to prepare a resin particle dispersion having a resin content of 25.0% by mass.
- Liquid absorbing member a porous body of PTFE (polytetrafluoroethylene) having an average pore diameter of 0.2 ⁇ m was used for the liquid absorbing member 105a.
- the contact angle of water on the surface (first surface) of the porous body of PTFE was 118 °.
- the liquid absorbing member 105a had a Gurley of 5 seconds, and the porous body had a thickness of 15 ⁇ m.
- the aqueous liquid component absorbed by the porous body by contact with the first image is removed from the porous body at least a part of the absorbed aqueous liquid component before contacting the first image again. I made it.
- a wetting liquid is applied to the liquid absorbing member 105a.
- this wetting liquid the following composition was used, and the applied amount was 10 g / m 2 .
- ⁇ Glycerin 10.0% by mass
- Surfactant (Product name: MegaFuck F-444, manufactured by DIC Corporation) 5.0% by mass ⁇ Ion-exchanged water remaining mass%
- the cloud point of the surfactant in the wetting liquid was measured as follows. Prepare 50 ml of wetting liquid. Then, the wetting liquid was heated from room temperature, and the heating temperature at which the visually clear wetting liquid changed to white turbidity was defined as the cloud point of the surfactant in the wetting liquid. The nip pressure between the transfer member 101 and the liquid absorbing member 105a is applied to the pressing member 105b so that the average pressure is 39.2 N / cm 2 (4 kgf / cm 2 ).
- the pressing member 105b is a roller having a diameter of 200 mm.
- Example 2 The surfactant contained in the wetting liquid is Capstone FS-3100 (trade name, The Chemoury Company LLC) instead of MegaFac F-444 (trade name, manufactured by DIC), which is a fluorine-based activator.
- Capstone FS-3100 trade name, The Chemoury Company LLC
- MegaFac F-444 trade name, manufactured by DIC
- Example 3 Instead of MegaFac F-444 (trade name, manufactured by DIC), which is a fluorine-based surfactant, the surfactant contained in the wetting liquid is BYK349 (trade name, manufactured by BYK), which is a silicone-based surfactant. Otherwise, image formation and evaluation of the formed image were performed in the same manner as in Example 1.
- Example 4 Image formation and evaluation of the formed image were performed in the same manner as in Example 1 except that the application pressure of the wetting liquid was changed as shown in Table 1.
- Example 4 since the wetting liquid was applied by dipping without applying pressure, a slight image flow that was not noticed by the first use was seen, but after the image and the porous body were in pressure contact, Since the porous body was uniformly wetted with the ink liquid, no image flow was observed after repeated use.
- Example 5 Except that the surfactant contained in the ink was changed to MegaFac F-444 (trade name, manufactured by DIC) instead of acetylenol E100 (trade name, manufactured by Kawaken Fine Chemical Co., Ltd.), the same as in Example 4. Then, image formation and the formed image were evaluated.
- MegaFac F-444 trade name, manufactured by DIC
- acetylenol E100 trade name, manufactured by Kawaken Fine Chemical Co., Ltd.
- Example 6 Except that the temperature of the porous body was changed as shown in Table 1, image formation and evaluation of the formed image were performed in the same manner as in Example 1.
- Example 7 Image formation and evaluation of the formed image were performed in the same manner as in Example 2 except that the temperature of the porous body was changed as described in Table 1.
- Example 8 Image formation and evaluation of the formed image were performed in the same manner as in Example 3 except that the temperature of the porous body was changed as described in Table 1.
- Example 9 A PTFE porous material was immersed in OPTOOL HD-1100TH (manufactured by Daikin Industries, Ltd.) and subjected to surface treatment, and the same as in Example 1 except that the contact angle of water with respect to the first surface of the porous material was lowered. Then, image formation and the formed image were evaluated.
- OPTOOL HD-1100TH manufactured by Daikin Industries, Ltd.
- Example 10 Except that the porous body of PTFE was dipped in OPTOOL DS-TH (manufactured by Daikin Industries, Ltd.) and subjected to surface treatment, and the contact angle of water with respect to the first surface of the porous body was lowered, the same as in Example 1. Then, image formation and the formed image were evaluated.
- OPTOOL DS-TH manufactured by Daikin Industries, Ltd.
- Example 1 (Comparative Example 1) Image forming and evaluation of the formed image were performed in the same manner as in Example 1 except that no wetting liquid was applied to the porous body.
- Example 2 The surfactant contained in the wetting liquid was acetylenol E100 (trade name, manufactured by Kawaken Fine Chemical Co., Ltd.) instead of F-444 (trade name, manufactured by DIC), and the first of the porous body of the wetting liquid was used. It adjusted so that the contact angle with respect to a surface might be 90 degrees or more. Other than that, image formation and evaluation of the formed image were performed in the same manner as in Example 1.
- Example 4 An image formed and formed in the same manner as in Example 1, except that a porous PTFE porous material obtained by treating the porous PTFE material with PVA (polyvinyl alcohol) was used instead of the porous PTFE material. was evaluated.
- PVA polyvinyl alcohol
- Example 5 Comparative Example 5 except that a porous PTFE material obtained by treating the porous PTFE material with PVA (polyvinyl alcohol) was used instead of the PTFE porous material, and no wetting liquid was applied. Similarly, the image formation and the formed image were evaluated.
- PVA polyvinyl alcohol
- the ink jet recording method in each example and comparative example was evaluated by the following evaluation methods.
- the evaluation results are shown in Table 1.
- the evaluation criteria AA to B of the following evaluation items were set as preferable levels, and C was set as an unacceptable level.
- the color material adhesion was evaluated by the following procedure. First, the first surface of the porous body included in the liquid absorbing member is brought into contact with the image (first image) formed on the transfer body 101. And the 1st surface of a porous body is peeled from an image. The state of color material adhesion to the surface (first surface) in contact with the image of the porous body after peeling from this image was evaluated according to the following criteria. It is preferable that the coloring material adheres little to the first surface of the porous body.
- image flow was evaluated according to the following procedure. First, the first surface of the porous body included in the liquid absorbing member is brought into contact with the image (first image) formed on the transfer body 101. And the 1st surface of a porous body is peeled from an image. The image flow in the image (second image) left on the transfer after peeling was evaluated according to the following criteria.
- the image flow is a phenomenon in which the color material in the image moves at the edge of the image by bringing the first surface of the porous body into contact with the image. The smaller the amount of movement of the color material, the higher the image quality and the better.
- A No image flow was observed even after repeated use (contacting the porous body with the image 10 times).
- C Image flow was greatly observed after one use.
- Example 11 3 except that the direct drawing type ink jet recording apparatus shown in FIG. 4 which directly applies the reaction liquid to the recording medium and further applies ink is used instead of the transfer type ink jet recording apparatus shown in FIG. Evaluation was performed by the method.
- Gloria pure white paper basis weight 210 g / m 2 (manufactured by Gojo Paper Co., Ltd.) was used as a recording medium.
- the reaction liquid composition, the reaction liquid application device 203, the ink composition, the ink application device 204, the recording medium conveyance speed, and the liquid absorption device 205 are the same conditions as those of the transfer type ink jet recording apparatus used in Example 1. It has become. As a result, it was confirmed that the same color material adhesion and image flow evaluation results as in Example 1 were obtained.
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Abstract
Description
被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の撥水性を有する多孔質体の第一の面を、前記被記録体上の前記第一の画像に接触させて、前記第一の画像から前記水性液体成分の少なくとも一部を吸収する液吸収工程と、
を有するインクジェット記録方法であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を付与して湿潤処理する湿潤処理工程をさらに有し、
前記液吸収工程は、前記湿潤処理工程によって湿潤された第一の面を前記第一の画像に接触させることを特徴とする。
被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の撥水性を有する多孔質体の第一の面を、前記記録媒体の前記第一の画像に接触させて、前記第一の画像を構成するインクを濃縮する液吸収工程と、
を有するインクジェット記録方法であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を付与して湿潤処理する湿潤処理工程をさらに有し、
前記液吸収工程は、前記湿潤処理工程によって湿潤された第一の面を前記第一の画像に接触させることを特徴とする。
被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成ユニットと、
撥水性を有する第一の面を有し、前記第一の面を前記被記録体上の前記第一の画像に接触させることで、前記第一の画像から前記水性液体成分の少なくとも一部を吸収する多孔質体を有する液吸収部材と、
を有するインクジェット記録装置であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を、前記第一の面に付与して湿潤処理する湿潤処理部をさらに有する、
ことを特徴とする。
被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成ユニットと、
撥水性の第一の面を有し、前記第一の面を前記被記録体上の前記第一の画像に接触させることで、前記第一の画像を構成するインクを濃縮する多孔質体を有する液吸収部材と、を有するインクジェット記録装置であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を、前記第一の面に付与して湿潤処理する湿潤処理部をさらに有する、
ことを特徴とするインクジェット記録装置。
(1)湿潤液を収容部に収容し、収容部から湿潤液が多孔質体の第一の面に供給されることによって、多孔質体の第一の面の湿潤処理を行う方法。
(2)第一の画像に含まれる水性液体成分に湿潤液としての機能を持たせ、第一の画像に多孔質体の第一の面が接触した際に、第一の画像から多孔質体の第一の面に湿潤液が供給されることによって、多孔質体の第一の面の湿潤処理を行う方法。
また、画像形成工程は、被記録体に反応液を付与する工程と、被記録体にインクを付与する工程とを有することが好ましい。このとき、被記録体上において、反応液が付与される領域と、インクが付与される領域とは少なくとも一部で重なっている。すなわち、被記録体上において反応液とインクとを接触させて第一の画像を形成することが好ましい。また、被記録体に反応液を付与する工程と、被記録体にインクを付与する工程の順序は特に限定されないが、画像の高画質化の観点から、画像形成工程は、被記録体に反応液を付与する工程と、被記録体にインクを付与する工程と、をこの順に有することが好ましい。すなわち、画像形成工程は、被記録体に反応液を付与する工程と、被記録体に、該反応液を付与した領域と少なくとも一部が重なるようにインクを付与する工程とを、この順に有することが好ましい。
(A)湿潤液を収容する収容部と、収容部から湿潤液を多孔質体の第一の面に供給する湿潤液付与部とを有する構成。
(B)第一の画像に含まれる水性液体成分に湿潤液としての機能を持たせ、第一の画像に多孔質体の第一の面が接触した際に、第一の画像から多孔質体の第一の面に湿潤液が供給されることによって、多孔質体の第一の面の湿潤処理が行われるように、被記録体上の第一の画像が形成された領域が湿潤処理部を兼ねる構成。
反応液及びインクの少なくとも一方には、水を第一の液体とした場合に、それ以外の第二の液体を含んでいてもよい。第二の液体の揮発性の高低は問わないが、第一の液体よりも揮発性の高い液体であることが好ましい。
反応液付与装置は、反応液を被記録体上に付与できるいかなる装置であってもよく、従来知られている各種装置を適宜用いる事ができる。具体的には、グラビアオフセットローラ、インクジェットヘッド、ダイコーティング装置(ダイコータ)、ブレードコーティング装置(ブレードコータ)などが挙げられる。反応液付与装置による反応液の付与は、被記録体上でインクと混合(反応)することができれば、インクの付与前に行っても、インクの付与後に行ってもよい。好ましくは、インクの付与前に反応液を付与する。反応液をインクの付与前に付与することによって、インクジェット方式による画像記録時に、隣接して付与されたインク同士が混ざり合うブリーディングや、先に着弾したインクが後に着弾したインクに引き寄せられてしまうビーディングを抑制することもできる。
反応液は、インクを高粘度化する成分(インク高粘度化成分)を含有する。ここで、インクの高粘度化とは、インクを構成している成分である色材や樹脂等がインク高粘度化成分と接触することによって化学的に反応し、あるいは物理的に吸着し、これによってインク粘度の上昇が認められることである。このインクの高粘度化には、インク粘度の上昇が認められる場合のみならず、色材や樹脂などのインクを構成する成分の一部が凝集する事により局所的に粘度の上昇を生じる場合も含まれる。
インクを付与するインク付与装置として、インクジェットヘッドを用いる。インクジェットヘッドとしては、例えば電気-熱変換体によりインクに膜沸騰を生じさせ気泡を形成することでインクを吐出する形態、電気-機械変換体によってインクを吐出する形態、静電気を利用してインクを吐出する形態等が挙げられる。本発明では、公知のインクジェットヘッドを用いることができる。中でも特に高速で高密度の印刷の観点からは電気-熱変換体を利用したものが好適に用いられる。描画は画像信号を受け、各位置に必要なインク量を付与する。
本発明に適用されるインクの各成分について説明する。
本発明に適用されるインクに含有される色材は、顔料を含むことが好ましい。例えば、色材として顔料、又は染料と顔料との混合物を用いることが好ましい。色材として用いることができる顔料の種類は特に限定されない。顔料の具体例としては、カーボンブラックなどの無機顔料;アゾ系、フタロシアニン系、キナクリドン系、イソインドリノン系、イミダゾロン系、ジケトピロロピロール系、ジオキサジン系などの有機顔料を挙げることができる。これらの顔料は、必要に応じて1種又は2種以上を用いることができる。
顔料を分散させる分散剤としては、インクジェット用インクに用いられる公知の分散剤を使用することができる。中でも本発明の態様においては構造中に親水性部と撥水性部とを併せ持つ水溶性の分散剤を用いることが好ましい。特に、少なくとも親水性のモノマーと撥水性のモノマーとを含んで共重合させた樹脂からなる顔料分散剤が好ましく用いられる。ここで用いられる各モノマーについては特に制限はなく、公知のものが好適に用いられる。具体的には、撥水性モノマーとしては、スチレン及びその他のスチレン誘導体、アルキル(メタ)アクリレート、ベンジル(メタ)アクリレート等が挙げられる。また親水性モノマーとしては、アクリル酸、メタクリル酸、マレイン酸等が挙げられる。
本発明に適用されるインクは、色材を有しない各種微粒子を含有させて用いてもよい。中でも樹脂微粒子は画像品位や定着性の向上に効果がある場合があり好適である。また、反応液により凝集することにより、より定着性の向上に効果がある場合があり、より好適である。
本発明では、反応液またはインクのいずれかに活性エネルギー線で硬化する成分を含有することが好ましい。活性エネルギー線で硬化する成分を液吸収工程前に硬化させることで、液吸収部材への色材付着が抑制される場合がある。
本発明に用いることのできるインクは界面活性剤を含んでもよい。界面活性剤としては、具体的には、アセチレングリコールエチレンオキシド付加物(アセチレノ-ルE100、川研ファインケミカル株式会社製)等が挙げられる。インク中の界面活性剤の量は、インク全質量に対して0.01質量%以上5.0質量%以下であることが好ましい。
インクとしては、液媒体として少なくとも水を含む水性インクが用いられる。水性インクとしては、色材として少なくとも顔料を含む水性顔料インクを用いることができる。
本発明に用いることのできるインクは上記成分以外にも必要に応じて、pH調整剤、防錆剤、防腐剤、防黴剤、酸化防止剤、還元防止剤、水溶性樹脂及びその中和剤、粘度調整剤など種々の添加剤を含有してもよい。
本発明では、第一の画像から水性液体成分の少なくとも一部を、多孔質体を有する液吸収部材と接触させることで吸収し、第一の画像中の液体成分の含有量を減少させる。液吸収部材の第一の画像との接触面を第一の面とし、第一の面に多孔質体が配置される。
本発明における多孔質体は、第一の画像に含まれる色材との親和性を低くする(色材の離型性を向上させる)ために、撥水性を有する。撥水性の多孔質体は、水の接触角は90°以上であることが好ましい。本発明者らの鋭意検討の結果、水の接触角が90°以上である多孔質体を用いることで、多孔質体へのインクの色材の付着を抑制出来ることが分かった。本明細書における接触角とは、測定液体(水や湿潤液等)を対象物(多孔質体の第一の面)に滴下し、その液滴が対象物に接している部分での対象物表面と液滴の接線とがなす角度のことである。測定の技法にはいくつか種類があるが、本発明者はJIS R3257の「6.静滴法」に記載の技法に準拠して、多孔質体の第一の面の接触角の測定を行った。なお、測定液体として用いられる水は純水(蒸留水)である。
次に、多孔質体を多層構成とする場合の実施形態について説明する。ここでは第一の画像に接触する側の第一の層、第一の層の第一の画像との接触面と反対の面に積層される層を第二の層として説明する。さらに多層の構成についても順次第一の層からの積層順で表記する。なお、本明細書において、第一の層を「吸収層」、第二の層以降を「支持層」ということがある。
色材付着を抑制するため、及び、クリーニング性を高くするために、第一の層に上述した撥水性の多孔質体を用いる。これらの樹脂は、必要に応じて1種又は2種以上を用いることができ、第一の層の中に複数の膜が積層された構成でもよい。
本発明において、第二の層は通気性をもつ層であることが好ましい。このような層は樹脂繊維の不織布でもよいし、織布でも良い。第二の層の材料としては、特に限定されないが、第一の層側へ吸収した液体が逆流しないように、第一の層に対して画像から吸収される水性液体成分との接触角が同等かそれよりも低い材料であることが好ましい。具体的には、ポリオレフィン(ポリエチレン(PE)、ポリプロピレン(PP)など)、ポリウレタン、ナイロン、ポリアミド、ポリエステル(ポリエチレンテレフタラート(PET)など)、ポリスルフォン(PSF)などの単一素材、またはこれらの複合材料などから好ましく選択される。また、第二の層は第一の層よりも孔径の大きな層であることが好ましい。
本発明において、多層構造の多孔質体は3層以上の構成であってもよく、限定されない。三層目(第三の層ともいう)以降の層としては剛性の観点から不織布が好ましい。材料としては第二の層と同様なものを用いることができる。
液吸収部材には、上記の積層構造の多孔質体以外に、液吸収部材の側面を補強する補強部材を有してもよい。また、長尺のシート形状の多孔質体の長手方向端部を繋いでベルト状の部材とする際の接合部材を有してもよい。このような材料としては非孔質のテープ材などを用いることができ、画像と接触しない位置あるいは周期に配置すればよい。
第一の層と第二の層を積層して多孔質体を形成する方法は、特には限定されなることはない。重ね合わせるだけでもよいし、接着剤ラミネートまたは熱ラミネートなどの方法を用いて互いに接着してもよい。通気性の観点から、本発明においては熱ラミネートが好ましい。また、例えば、加熱により、第一の層または第二の層の一部を溶融させて接着積層してもよい。また、ホットメルトパウダーのような融着材を第一の層と第二の層の間に介在させて加熱により互いに接着積層してもよい。第三の層以上を積層する場合は、一度に積層させてもよいし、順次積層させてもよく、積層順に関しては適宜選択される。加熱工程では、加熱されたローラで多孔質体を挟み込んで加圧しながら、多孔質体を加熱するラミネート法が好ましい。
本発明のインクジェット記録装置としては、被記録体としての転写体上に第一の画像を形成し、液吸収部材によって水性液体成分が吸収された後の画像である第二の画像を記録媒体へ転写するインクジェット記録装置と、被記録体としての記録媒体上に第一の画像を形成するインクジェット記録装置とが挙げられる。
図3は、本実施形態の転写型インクジェット記録装置の概略構成の一例を示す模式図である。転写型インクジェット記録装置100は、第一の画像と、第一の画像から水性液体成分の少なくとも一部を除去した第二の画像とを一時的に保持する転写体101を備えている。また、転写型インクジェット記録装置100は、第二の画像を、画像を形成すべき記録媒体108、すなわち目的とする用途に応じた最終画像を形成するための記録媒体上に転写する転写用の押圧部材106を備えた転写ユニットを含む。
転写体101は、画像形成面を含む表面層を有する。表面層の部材としては、樹脂、セラミック等各種材料を適宜用いることができるが、耐久性等の点で圧縮弾性率の高い材料が好ましい。具体的には、アクリル樹脂、アクリルシリコーン樹脂、フッ素含有樹脂、加水分解性有機ケイ素化合物を縮合して得られる縮合物等が挙げられる。
転写体101は、支持部材102上に支持されている。転写体の支持方法として、各種接着剤や両面テープを用いてもよい。または、転写体に金属、セラミック、樹脂等を材質とした設置用部材を取り付けることで、設置用部材を用いて転写体を支持部材102上に支持してもよい。
本実施形態のインクジェット記録装置は、転写体101に反応液を付与する反応液付与装置103を有する。図3の反応液付与装置103は、反応液を収容する反応液収容部103aと、反応液収容部103aにある反応液を転写体101上に付与する反応液付与部材103b、103cを有するグラビアオフセットローラの場合を示している。
本実施形態のインクジェット記録装置は、反応液を付与された転写体101にインクを付与するインク付与装置104を有する。反応液とインクとが混合されることで第一の画像が形成され、次の液吸収装置105にて第一の画像から液体成分が吸収される。
本実施形態において、液吸収装置105は、液吸収部材105a、および、液吸収部材105aを転写体101上の第一の画像に押し当てる液吸収用の押圧部材105bを有する。なお、液吸収部材105aおよび押圧部材105bの形状については特に制限がない。例えば、図3に示すように、押圧部材105bが円柱形状であり、液吸収部材105aがベルト形状であって、円柱形状の押圧部材105bでベルト形状の液吸収部材105aを転写体101に押し当てる構成であってもよい。また、押圧部材105bが円柱形状であり、液吸収部材105aが円柱形状の押圧部材105bの周面上に形成された円筒形状であって、円柱形状の押圧部材105bで円筒形状の液吸収部材105aを転写体に押し当てる構成であってもよい。
撥水性を有する多孔質体が第一の画像に接触する前に、多孔質体の第一の面に対する接触角が90°未満である湿潤液を付与する前処理手段によって前処理を施すことが好ましい。湿潤液は、多孔質体の第一の面との接触角が90°未満であり、多孔質体に目的とする液体吸収性を得ることができるものであれば特に限定されることはない。具体的には、湿潤液は、少なくとも水を含む水性液媒体と、湿潤液の表面張力を調整する成分とを含有することが好ましい。この湿潤液の表面張力を調整する成分としては特に制限は無いが、界面活性剤を用いることが好ましい。界面活性剤としては、シリコーン系界面活性剤及びフッ素系界面活性剤の少なくとも1種を用いることが好ましく、フッ素系界面活性剤を用いることがより好ましい。
転写体上の第一の画像に対して押圧する多孔質体の圧力が2.94N/cm2(0.3kgf/cm2)以上98N/cm2(10kgf/cm2)以下であれば、第一の画像中の液体成分をより短時間に固液分離でき、第一の画像中から液体成分を除去できるため好ましい。また、圧力は98N/cm2(10kgf/cm2)以下であれば、装置への構造上の負荷が抑制できるため好ましい。尚、本発明における多孔質体の第一の画像に対する接触圧力とは、転写体101と液吸収部材105aとの間のニップ圧を示しており、面圧分布測定器(新田株式会社製 I-SCAN)にて面圧測定を行い、加圧領域における加重を面積で割り、値を算出した。
第一の画像に液吸収部材105aを接触させる作用時間は、第一の画像中の色材が液吸収部材へ付着することをより抑制するために、50ms(ミリ秒)以内であることが好ましい。尚、本明細書における作用時間とは、上述した面圧測定における、被記録体の移動方向における圧力感知幅を、被記録体の移動速度で割って算出される。以降、この作用時間を液吸収ニップ時間と称す。
本実施形態では、第二の画像と記録媒体搬送装置107によって搬送される記録媒体108とが接触している間に、転写用の押圧部材106が記録媒体108を押圧することによって、記録媒体108上にインク像が転写される。転写体101上の第一の画像に含まれる液体成分を除去した後に、記録媒体108へ転写することにより、カールや、コックリング等を抑制した記録画像を得ることが可能となる。
転写手段106の形状については特に制限されないが、例えばローラ形状のものが挙げられる。
本実施形態において、記録媒体108は特に限定されず、公知の記録媒体をいずれも用いることができる。記録媒体としては、ロール状に巻回された長尺物、あるいは所定の寸法に裁断された枚葉のものが挙げられる。材質としては、紙、プラスチックフィルム、木板、段ボール、金属フィルムなどが挙げられる。
本実施形態における転写型インクジェット記録装置は、各装置を制御する制御システムを有する。図6は図3に示す転写型インクジェット記録装置における、装置全体の制御システムを示すブロック図である。図6において、301は外部プリントサーバー等の記録データ生成部、302は操作パネル等の操作制御部、303は記録プロセスを実施するためのプリンタ制御部、304は記録媒体を搬送するための記録媒体搬送制御部、305は印刷するためのインクジェットデバイスである。
本発明における別の実施形態として、直接描画型インクジェット記録装置が挙げられる。
直接描画型インクジェット記録装置において、被記録体は画像を形成すべき記録媒体である。
本実施形態の直接描画型インクジェット記録装置において、記録媒体搬送装置207は特に限定されず、公知の直接描画型インクジェット記録装置における搬送装置を用いることができる。例として、図4に示すように、記録媒体繰り出しローラ207a、記録媒体巻き取りローラ207b、記録媒体搬送ローラ207c、207d、207e、207fを有する記録媒体搬送装置が挙げられる。
本実施形態における直接描画型インクジェット記録装置は、各装置を制御する制御システムを有する。図4に示す直接描画型インクジェット記録装置における、装置全体の制御システムを示すブロック図は、図3に示す転写型インクジェット記録装置と同様に、図6に示す通りである。
本実施例では図3に示す転写型インクジェット記録装置を用いた。
本実施例における転写体101は接着剤により支持部材102の表面に固定されている。
本実施例では、厚さ0.5mmのPETシートにシリコーンゴム(信越化学工業株式会社製KE12)を0.3mmの厚さにコーティングしたシートを転写体Jの弾性層として用いた。さらにグリシドキシプロピルトリエトキシシランとメチルトリエトキシシランとをモル比1:1で混合し、加熱還流により得られる縮合物と光カチオン重合開始剤(ADEKA製SP150)の混合物を作製した。弾性層表面の水の接触角を10°以下となるように大気圧プラズマ処理を行い、前記混合物を弾性層上に付与し、UV照射(高圧水銀ランプ、積算露光量5000mJ/cm2)、熱硬化(150℃2時間)により成膜し、弾性層上に厚さ0.5μmの表面層を形成した転写体101を作製した。
反応液付与装置103により付与される反応液は、以下の組成のものを用いた。反応液付与装置103による反応液の付与量は1g/m2とした。
・グルタル酸 21.0質量%
・グリセリン 5.0質量%
・界面活性剤F-444(商品名、DIC社製) 5.0質量%
・イオン交換水 残質量%
インクは以下のように調製した。
カーボンブラック(製品名:モナク1100、キャボット製)10部、樹脂水溶液(スチレン-アクリル酸エチル-アクリル酸共重合体、酸価150、重量平均分子量(Mw)8,000、樹脂の含有量が20.0質量%の水溶液を水酸化カリウム水溶液で中和したもの)15部、純水75部を混合し、バッチ式縦型サンドミル(アイメックス製)に仕込み、0.3mm径のジルコニアビーズを200部充填し、水冷しつつ、5時間分散処理を行った。この分散液を遠心分離して、粗大粒子を除去した後、顔料の含有量が10.0質量%のブラック顔料分散体を得た。
エチルメタクリレート20部、2,2’-アゾビス-(2-メチルブチロニトリル)3部、n-ヘキサデカン2部を混合し、0.5時間攪拌した。この混合物を、スチレン-アクリル酸ブチル-アクリル酸共重合体(酸価:130mgKOH/g、重量平均分子量(Mw):7,000)の8%水溶液75部に滴下して、0.5時間攪拌した。次に超音波照射機で超音波を3時間照射した。続いて、窒素雰囲気下で80℃、4時間重合反応を行い、室温冷却後にろ過して、樹脂の含有量が25.0質量%である樹脂粒子分散体を調製した。
上記で得られた樹脂粒子分散体、及び、顔料分散体を下記各成分と混合した。尚、イオン交換水の残部は、インクを構成する全成分の合計が100.0質量%となる量のことである。
・顔料分散体(色材の含有量は10.0質量%) 40.0質量%
・樹脂粒子分散体 20.0質量%
・グリセリン 7.0質量%
・ポリエチレングリコール(数平均分子量(Mn):1,000) 3.0質量%
・界面活性剤:アセチレノールE100(川研ファインケミカル株式会社製) 0.5質量%
・イオン交換水 残部
本実施例では、液吸収部材105aに、平均孔径0.2μmのPTFE(ポリテトラフルオロエチレン)の多孔質体を用いた。このPTFEの多孔質体の表面(第一の面)の水の接触角は118°であった。この液吸収部材105aのガーレは5秒であり、多孔質体の厚みは15μmであった。また、第一の画像と接触することによって多孔質体が吸収した水性液体成分は再度第一の画像に接触する前に、その吸収した水性液体成分の少なくとも一部を多孔質体から除去するようにした。
・グリセリン 10.0質量%
・界面活性剤(製品名:メガファックF-444、DIC株式会社製) 5.0質量%
・イオン交換水 残質量%
湿潤液を50ml準備する。そして、その湿潤液を室温の状態から加熱し、目視で透明である湿潤液が白濁へ変化したところでの加熱温度を湿潤液中における界面活性剤の曇点とした。また、転写体101と液吸収部材105aとの間のニップ圧は、平均圧力が39.2N/cm2(4kgf/cm2)となるよう押圧部材105bに圧力が印加されている。また、押圧部材105bはローラ直径φ200mmのものを用いた。
湿潤液に含まれる界面活性剤をフッ素系の活性剤であるメガファックF-444(商品名、DIC社製)の代わりに、CapstoneFS-3100(商品名、The ChemoursCompanyLLC)を用い、それ以外は実施例1と同様に画像形成と形成された画像の評価を行った。
湿潤液に含まれる界面活性剤をフッ素系の活性剤であるメガファックF-444(商品名、DIC社製)の代わりに、シリコーン系の界面活性剤であるBYK349(商品名、BYK社製)を用い、それ以外は実施例1と同様に画像形成と形成された画像の評価を行った。
湿潤液の付与圧力を表1に示すように変えたこと以外は実施例1と同様にして画像形成と形成された画像の評価を行った。 実施例4では、湿潤液を圧力を加えずに浸漬付与で行ったため、1回目の使用で気にならないわずかな画像流れが見られたが、画像と多孔質体が加圧接触した後は、多孔質体がインクの液体分で均一に濡れたことで、その後の繰り返し使用で画像流れがみられなかった。
インクに含まれる界面活性剤をアセチレノールE100(商品名、川研ファインケミカル(株)製)の代わりにメガファックF-444(商品名、DIC社製)に変えたこと以外は実施例4と同様にして画像形成と形成された画像の評価を行った。
多孔質体の温度を表1に示すように変えたこと以外は実施例1と同様に画像形成と形成された画像の評価を行った。
多孔質体の温度を表1に記載の通りに変更したこと以外は実施例2と同様に画像形成と形成された画像の評価を行った。
多孔質体の温度を表1に記載の通りに変更したこと以外は実施例3と同様に画像形成と形成された画像の評価を行った。
PTFEの多孔質体をオプツールHD-1100TH(ダイキン工業株式会社製)に浸漬させて表面処理を施し、多孔質体の第一の面に対する水の接触角を低くした以外は実施例1と同様にして画像形成と形成された画像の評価を行った。
PTFEの多孔質体をオプツールDS-TH(ダイキン工業株式会社製)に浸漬させて表面処理を施し、多孔質体の第一の面に対する水の接触角を低くした以外は実施例1と同様にして画像形成と形成された画像の評価を行った。
多孔質体に湿潤液を付与せず、その他は実施例1と同様に画像形成と形成された画像の評価を行った。
湿潤液に含まれる界面活性剤をF-444(商品名、DIC社製)の代わりに、アセチレノールE100(商品名、川研ファインケミカル(株)製)とし、湿潤液の多孔質体の第一の面に対する接触角が90°以上となるように調整した。その他は実施例1と同様に画像形成と形成された画像の評価を行った。
多孔質体の温度を表1に記載の通りに変更したこと以外は比較例2と同様に画像形成と形成された画像の評価を行った。
PTFEの多孔質体の代わりに、PTFEの多孔質体をPVA(ポリビニルアルコール)で処理した親水化PTFEの多孔質体を用いたこと以外は、実施例1と同様に画像形成と形成された画像の評価を行った。
PTFEの多孔質体の代わりに、PTFEの多孔質体をPVA(ポリビニルアルコール)で処理した親水化PTFEの多孔質体を用い、かつ、湿潤液を付与しなかったこと以外は、実施例1と同様に画像形成と形成された画像の評価を行った。
各実施例及び各比較例において、以下の手順で色材付着の評価を行った。
まず、転写体101上に形成された画像(第一の画像)に液吸収部材が有する多孔質体の第一の面を接触させる。そして、多孔質体の第一の面を画像から剥離する。この画像から剥離した後の多孔質体の画像と接触した面(第一の面)への色材付着の状態について以下の基準により評価した。多孔質体の第一の面への色材付着は少ないことが好ましい。第一の層であるフッ素樹脂の変形量が小さく、濾過性能が高く、また押圧部材105bによる多孔質体への押圧力のムラが少ないほど色材付着量は減る傾向があった。
AA:繰り返し使用(多孔質体を画像に10回接触)しても色材付着はみられなかった。
A:1回の使用では色材付着はみられなかった。
B:1回の使用によってわずかに付着がみられたが、気にならないレベルであった。
C:1回の使用によって色材付着が多くみられた。
各実施例及び各比較例において、以下の手順で画像流れの評価を行った。
まず、転写体101に形成された画像(第一の画像)に液吸収部材が有する多孔質体の第一の面を接触させる。そして、多孔質体の第一の面を画像から剥離する。この剥離した後の転写上に残された画像(第二の画像)における画像流れを以下の基準で評価した。なお、画像流れとは、画像に多孔質体の第一の面を接触させることにより、画像端部において画像中の色材が移動してしまう現象である。この色材の移動量が少ないほど、画像品位が高く好ましい。
A:繰り返し使用(多孔質体を画像に10回接触)しても画像流れがみられなかった。
B:繰り返し使用(多孔質体を画像に10回接触)した場合にわずかに画像流れがみられたが、気にならないレベルであった。
C:一回の使用によって、画像流れが大きくみられた。
図3に示す転写型インクジェット記録装置の代わりに、直接記録媒体に反応液を付与し、さらにインクを付与する図4に示す直接描画型インクジェット記録装置を用いたこと以外は、実施例1と同様の方法で評価を行った。図4に示す直接描画型インクジェット記録装置における画像評価においては、記録媒体としてグロリアピュアホワイト紙坪量210g/m2(五條製紙株式会社製)を用いた。記録媒体以外の、反応液組成、反応液付与装置203、インク組成、インク付与装置204、記録媒体の搬送速度、液吸収装置205は、実施例1で用いた転写型インクジェット記録装置と同様の条件となっている。その結果、実施例1と同じ色材付着、画像流れの評価結果が得られることが確認された。
2 湿潤液
3 第一の画像
4 被記録体
5 水性液体成分
6 第二の画像
105 液吸収装置
105a 液吸収部材
105b 液吸収用の押圧部材
105c、d、e 張架ローラ
110 湿潤液付与装置
110a 湿潤液収容部
110b 湿潤液付与部材
110c 湿潤液
205 液吸収装置
205a 液吸収部材
205b 液吸収用の押圧部材
205c、d、e、f、g 張架ローラ
Claims (27)
- 被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の撥水性を有する多孔質体の第一の面を、前記被記録体上の前記第一の画像に接触させて、前記第一の画像から前記水性液体成分の少なくとも一部を吸収する液吸収工程と、
を有するインクジェット記録方法であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を付与して湿潤処理する湿潤処理工程をさらに有し、
前記液吸収工程は、前記湿潤処理工程によって湿潤された第一の面を前記第一の画像に接触させることを特徴とするインクジェット記録方法。 - 前記インクが、前記反応液によって凝集される樹脂微粒子を含むことを特徴とする請求項1に記載のインクジェット記録方法。
- 前記色材が、顔料を含む請求項1または2に記載のインクジェット記録方法。
- 前記第一の面を前記第一の画像に接触する前に、前記第一の面に前記湿潤液を予め付与する工程を有する請求項1乃至3のいずれか1項に記載のインクジェット記録方法。
- 前記第一の画像に含まれる水性液体成分の、前記多孔質体の第一の面に対する接触角が90°未満である請求項1乃至4のいずれか1項に記載のインクジェット記録方法。
- 前記湿潤液が、水と界面活性剤を含む請求項1乃至5のいずれか1項に記載のインクジェット記録方法。
- 前記界面活性剤が、シリコーン系界面活性剤またはフッ素系界面活性剤である請求項5または6に記載のインクジェット記録方法。
- 前記多孔質体の第一の面と、前記第一の画像の接触時の温度を、前記界面活性剤の曇点未満の温度に制御する請求項5乃至7のいずれか1項に記載のインクジェット記録方法。
- 前記多孔質体の前記第一の面に対する水の接触角が90°以上である請求項1乃至8のいずれか1項に記載のインクジェット記録方法。
- 前記多孔質体が、ポリテトラフルオロエチレンを含む撥水性樹脂を含む請求項1乃至9のいずれか1項に記載のインクジェット記録方法。
- 前記被記録体は、前記第一の画像と、前記第一の画像から前記水性液体成分の少なくとも一部が除去された第二の画像とを一時的に保持する転写体であって、最終画像を形成するための記録媒体に該第二の画像を転写する工程を有する請求項1乃至10のいずれか1項に記載のインクジェット記録方法。
- 前記被記録体は、最終画像を形成するための記録媒体であり、該記録媒体上で前記第一の画像から前記水性液体成分の少なくとも一部が除去された第二の画像の形成が行われる請求項1乃至10のいずれか1項に記載のインクジェット記録方法。
- 前記画像形成工程は、前記被記録体に前記反応液を付与する工程と、前記被記録体にインクを付与する工程と、をこの順に有する請求項1乃至12のいずれか1項に記載のインクジェット記録方法。
- 被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の撥水性を有する多孔質体の第一の面を、前記記録媒体の前記第一の画像に接触させて、前記第一の画像を構成するインクを濃縮する液吸収工程と、
を有するインクジェット記録方法であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を付与して湿潤処理する湿潤処理工程をさらに有し、
前記液吸収工程は、前記湿潤処理工程によって湿潤された第一の面を前記第一の画像に接触させることを特徴とするインクジェット記録方法。 - 被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成ユニットと、
撥水性の第一の面を有し、前記第一の面を前記被記録体上の前記第一の画像に接触させることで、前記第一の画像から前記水性液体成分の少なくとも一部を吸収する多孔質体を有する液吸収部材と、を有するインクジェット記録装置であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を、前記第一の面に付与して湿潤処理する湿潤処理部をさらに有する、
ことを特徴とするインクジェット記録装置。 - 前記インクが、前記反応液によって凝集される樹脂微粒子を含むことを特徴とする請求項15に記載のインクジェット記録装置。
- 前記色材が、顔料を含む請求項15または16に記載のインクジェット記録装置。
- 前記湿潤処理部は、前記湿潤液の収容部と、該収容部に収容された湿潤液を前記多孔質体の第一の面に付与する湿潤液付与部とを有する請求項15乃至17のいずれか1項に記載のインクジェット記録装置。
- 前記第一の画像に含まれる水性液体成分の、前記多孔質体の第一面に対する接触角が90°未満である請求項15乃至18のいずれか1項に記載のインクジェット記録装置。
- 前記湿潤液が、水と界面活性剤を含む請求項15乃至19のいずれか1項に記載のインクジェット記録装置。
- 前記界面活性剤が、シリコーン系界面活性剤またはフッ素系界面活性剤である請求項20に記載のインクジェット記録装置。
- 前記多孔質体の第一の面と、前記第一の画像の接触時の温度を、前記界面活性剤の曇点未満の温度に制御する温度制御部を有する請求項20または21に記載のインクジェット記録装置。
- 前記多孔質体の前記第一の面に対する水の接触角が90°以上である請求項15乃至22のいずれか1項に記載のインクジェット記録装置。
- 前記多孔質体が、ポリテトラフルオロエチレンを含む撥水性樹脂を含む請求項23に記載のインクジェット記録装置。
- 前記被記録体は、前記第一の画像と、前記第一の画像から前記水性液体成分の少なくとも一部が除去された第二の画像とを一時的に保持する転写体であって、最終画像を形成するための記録媒体に該第二の画像を転写する転写部を有する請求項15乃至24のいずれか1項に記載のインクジェット記録装置。
- 前記被記録体は、最終画像を形成するための記録媒体であり、該記録媒体上で前記第一の画像から前記水性液体成分の少なくとも一部が前記液吸収部材により除去された第二の画像の形成が行われる請求項15乃至25のいずれか1項に記載のインクジェット記録装置。
- 被記録体上に、色材を含むインクと、前記インクを粘稠する反応液とを付与することで、水性液体成分と色材とを含む第一の画像を形成する画像形成ユニットと、
撥水性の第一の面を有し、前記第一の面を前記被記録体上の前記第一の画像に接触させることで、前記第一の画像を構成するインクを濃縮する多孔質体を有する液吸収部材と、を有するインクジェット記録装置であって、
前記第一の面に、当該第一の面に対する接触角が90°未満の湿潤液を、前記第一の面に付与して湿潤処理する湿潤処理部をさらに有する、
ことを特徴とするインクジェット記録装置。
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