WO2017119042A1 - 画像形成装置及び画像形成方法 - Google Patents
画像形成装置及び画像形成方法 Download PDFInfo
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- WO2017119042A1 WO2017119042A1 PCT/JP2016/005243 JP2016005243W WO2017119042A1 WO 2017119042 A1 WO2017119042 A1 WO 2017119042A1 JP 2016005243 W JP2016005243 W JP 2016005243W WO 2017119042 A1 WO2017119042 A1 WO 2017119042A1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- 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
- B41J2/0057—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material where an intermediate transfer member receives the ink before transferring it on the printing material
-
- 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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/17—Cleaning arrangements
-
- 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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
-
- 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
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
-
- 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
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
-
- 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
- C09D11/54—Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2002/012—Ink jet with intermediate transfer member
Definitions
- the present invention relates to an image forming apparatus and an image forming 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 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 in which an image is transferred to a recording medium such as paper after the liquid is dried by heat energy or the like is a method in which an image is transferred to a recording medium such as paper after the liquid 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.
- image flow may occur during processing by the liquid absorbing member, or the intended liquid removal effect from the image by the liquid absorbing member may not be obtained. was there.
- An object of the present invention is to provide an image forming apparatus and an image forming method capable of achieving high absorption removal of a liquid component from the image without disturbing the image by bringing a liquid absorbing porous body into contact with the image including the liquid component. There is.
- An image forming apparatus includes: An image forming unit for forming a first image including a first liquid and a color material on a recording medium; A liquid-absorbing member having a first surface in contact with the first image and having a porous body that absorbs at least part of the first liquid from the first image; A nip portion is formed by bringing the first surface formed of the porous body of the liquid absorbing member into contact with the surface of the recording medium opposite to the first surface on which the first image is formed.
- the image forming method includes: An image forming step of forming a first image including a first liquid and a color material on a recording medium; Liquid absorption in which the first surface of the porous body of the liquid absorbing member is brought into contact with the first image, and at least a part of the first liquid is absorbed by the porous body from the first image.
- An image forming method comprising: In the liquid absorption step, the first surface formed from the porous body of the liquid absorption member is brought into contact with the surface on which the first image of the recording medium facing the first surface is formed.
- an image forming apparatus and an image forming method capable of achieving high absorption removal of a liquid from an image without disturbing the image by bringing a liquid absorbing porous body into contact with the image containing the liquid.
- 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.
- FIG. 3 is a block diagram showing a control system for the entire apparatus in the ink jet recording apparatus shown in FIGS. 1 and 2.
- FIG. 2 is a block diagram of a printer control unit in the transfer type inkjet recording apparatus shown in FIG. 1.
- FIG. 3 is a block diagram of a printer control unit in the direct drawing type inkjet recording apparatus shown in FIG. 2. It is a detailed block diagram of the liquid content removal part concerning this embodiment. It is a detailed block diagram of the liquid content removal part concerning this embodiment.
- FIG. 6 is a diagram showing a change in nip pressure in the nip portion in Examples 1 to 5 and Comparative Examples 1 to 3.
- FIG. 6 is a diagram showing a change in nip pressure in the nip portion in Examples 1 to 5 and Comparative Examples 1 to 3.
- the inventors of the present invention have studied means for achieving the technical problem of performing high-absorption removal from an image to be processed of a target liquid without causing image disturbance. As a result, it has been newly found that such a technical problem can be achieved by adjusting the change in the nip pressure in the transport direction on the recording medium in the nip portion formed by the recording medium and the processed image.
- the present invention has been made on the basis of such new findings by the present inventors.
- An image forming method includes an image forming step of forming a first image including a first liquid and a color material on a recording medium, and a first surface of the porous body of the liquid absorbing member. And a liquid absorption step of contacting the first image and absorbing at least a part of the first liquid from the first image by the porous body.
- the first image is an image to be processed as a liquid absorption processing target composed of an ink image including a liquid component including a first liquid and a color material. That is, the first image is an ink image before liquid removal before being subjected to liquid absorption processing.
- a nip portion is formed by the surface having the first image.
- the first image is passed through the nip so as to be in contact with the first surface of the porous body, and at least a part of the liquid from the first image is removed to the porous body side.
- a second image with reduced can be obtained.
- the second image is an ink image after liquid removal in which the content of the first liquid (aqueous liquid component) is reduced by performing a liquid absorption process.
- P1, P2, X1, X2, A, and B are defined as follows.
- X1 Nip distance from the start of contact between the first surface of the porous body and the recording medium to
- the entrance of the recording medium at the nip portion at the nip pressure peak P1 is the tip of the nip portion (the most upstream portion of the nip portion) in the conveyance direction of the recording body, and the porous body and the recording medium at the nip pressure peak P2. Is a rear end (the most downstream portion) of the nip portion.
- P1 is an initial pressure peak on the downstream side in the conveyance direction of the recording medium from the front end of the nip portion
- P2 is an initial pressure peak on the upstream side in the conveyance direction of the recording medium from the rear end of the nip portion.
- the nip pressure at an arbitrary position of the first image increases due to the movement accompanying the conveyance of the recording medium, reaches P1, and then enters a released state where no nip pressure is applied through P2.
- the rate of pressure increase up to P1 is set low.
- the nip pressure up to the peak pressure it is possible to ensure the intended high absorbency of the liquid component from the first image in the porous body. Furthermore, since the ratio of the pressure drop from the peak pressure at the rear end side of the nip portion to the release from the nip pressure is set high, the separation from the porous body is smoothly performed from the first image, and the liquid content is reduced. A sufficient pulling force to the porous body side can be obtained, and image disturbance can be effectively prevented.
- P1 and P2 are not particularly limited, but further improvement of the removal effect of the liquid in the first image and the coloring material in the first image adhere to the liquid absorbing member.
- P1 is preferably not more than 2.94N / cm 2 (0.3kgf / cm 2) or more 19.6N / cm 2 (2kgf / cm 2).
- P2 is 2.94 N / cm 2 (0.3 kgf / cm 2 ) in order to further improve the effect of removing the liquid component in the first image and to suppress the structural load on the image forming apparatus. or 98N / cm 2 (10kgf / cm 2) is preferably less.
- the disturbance of the image to be processed due to the contact of the porous body of the liquid absorbing member with the image to be processed is suppressed, and the liquid component is made porous when the liquid absorbing member is peeled from the recording material from the nip portion.
- the pulling force to the body side works effectively. Therefore, when P1 and P2 are different, it is preferable that the relationship is P1 ⁇ 2 ⁇ P2.
- An image forming apparatus that can be applied to the image forming method according to the present invention includes at least an image forming unit that forms a first image including a first liquid and a color material on a recording medium, and a first image.
- a liquid-absorbing member that has a first surface that comes into contact with the porous body and absorbs at least part of the first liquid from the first image.
- the removal of the liquid component from the first image by the liquid absorbing member is performed on the first image on the recording medium at the nip formed by the recording medium and the porous body of the liquid absorbing member. This is done by passing The nip portion forms a nip portion by bringing the first surface formed from the porous body of the liquid absorbing member into contact with the surface on which the first image of the recording medium facing the first surface is formed. Formed by the nip portion forming unit. The pip pressure applied to the first image at the nip is adjusted so as to satisfy the relational expressions (1) to (3) described above.
- the image forming unit is not particularly limited as long as the first image including the first liquid and the color material can be formed on the recording medium.
- a first liquid application unit that applies a first liquid composition containing the first liquid or the second liquid onto the recording medium; and 2) a first liquid or a second liquid.
- a second liquid application unit that applies a second liquid composition containing a coloring material onto the recording medium. At least one of the first liquid composition and the second liquid composition includes the first liquid.
- the first image as the liquid absorption processing target is formed by applying the first liquid composition and the second liquid composition to the recording medium so that they have at least overlapping regions.
- the fixability of the color material applied together with the second liquid composition on the recording medium is improved by the first liquid composition.
- This improvement in the fixing property of the coloring material is achieved by the action of the first liquid composition from the initial state where the second liquid composition applied to the recording medium has fluidity, or in the ink itself. This means that the fluidity of the coloring material is lowered and becomes a fixed state that is less likely to flow compared to the initial state. The mechanism will be described later.
- the first image includes a mixture of the first liquid composition and the second liquid composition.
- the second liquid composition is ink containing a liquid medium and a color material
- the apparatus for applying the second liquid composition onto the recording medium is an ink jet recording device.
- the first liquid composition also acts chemically or physically with the second liquid composition to convert the mixture of the first liquid composition and the second liquid composition into the first liquid composition and A component that is more viscous than each of the second liquid compositions and improves the fixing property of the coloring material can be included.
- the first liquid composition can include an aqueous liquid component.
- the aqueous liquid component contains at least water, and includes a water-soluble organic solvent and various additives as necessary.
- a second liquid other than that can be included is water 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.
- the first liquid at least a part of the first liquid is selected as a main factor that causes a reduction in image fixing speed, beading, and the like.
- a water-based pigment ink is used as the second liquid composition for applying a coloring material to the recording medium, or a reaction liquid containing an aqueous liquid medium (aqueous liquid component) is used as the first liquid composition.
- a reaction liquid containing an aqueous liquid medium aqueous liquid component
- reaction liquid as the first liquid composition the reaction liquid application device as the liquid application unit for applying the first liquid composition onto the recording medium
- the ink as the second liquid composition the ink as the second liquid composition
- the second liquid composition An embodiment in which an ink applicator is used as a liquid applicator for applying the ink to a recording medium will be described.
- 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.
- This ink viscosity-increasing component reduces the fluidity of the ink on the recording medium and / or a part of the component constituting the ink, thereby suppressing bleeding and beading during the first image formation. There is an effect to.
- 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, a mixture of water and a water-soluble organic solvent, and / or a low-volatile organic solvent as the first liquid.
- the water used in this case is preferably water deionized by ion exchange or the like.
- a well-known organic solvent can be used.
- the reaction liquid can be used 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 (“acetylenol E100”, trade name of Kawaken Fine Chemical Co., Ltd.), perfluoroalkylethylene oxide adduct (“Megafac F444”, product of DIC Corporation). Name).
- An ink jet head that discharges liquid by an ink jet method is used as an ink applying device that forms an ink jet and forms an 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 the ink application amount applied in an area of at least 5 mm 2 or more in the area used as information on the recording medium from the viewpoint of removing the liquid component 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 application member may include an inkjet head that ejects ink (clear ink) that does not contain a color material.
- a pigment or a mixture of a dye and a pigment can be used as a color material contained in the ink applied to the present invention.
- 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 hydrophobic part in the structure.
- a pigment dispersant made of a resin obtained by copolymerizing at least a hydrophilic monomer and a hydrophobic monomer is preferably used.
- a well-known thing is used suitably.
- hydrophobic monomer examples include styrene and other styrene derivatives, alkyl (meth) acrylate, and benzyl (meth) acrylate.
- hydrophilic monomer examples 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.
- a so-called self-dispersing pigment that is dispersible by modifying the surface of the pigment itself without using a dispersant.
- the ink applied to the present invention can 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.
- 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
- 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.
- 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 ink used in the present invention can contain water or an aqueous liquid medium such as a mixture of water and a water-soluble organic solvent as a solvent.
- 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.
- an aqueous pigment ink containing at least a pigment as a coloring material can be used.
- the kind of 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, a mixture of two or more selected from these can also be used.
- 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 In the present invention, at least a part of the first liquid from the first image is absorbed by contacting with the liquid absorbing member having a porous body, and the content of the liquid component in the first image is reduced.
- 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 of the liquid-absorbing member according to the present invention preferably uses a material having an average pore diameter on the first surface side smaller than the average pore diameter on the second surface side facing the first surface.
- the pore diameter is preferably small, and at least the average pore diameter of the porous body on the first surface side in contact with the image is preferably 10 ⁇ m or less.
- the average pore diameter of the porous body on the first surface side in contact with the image is 0.05 ⁇ m or more.
- the average pore diameter means an average diameter on the surface of the first surface or the second surface, and can be measured by a known means such as a mercury intrusion method, a nitrogen adsorption method, or an SEM image observation. It is.
- the thickness of the porous body in order to achieve uniform and high air permeability.
- 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 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 in contact with the first image may be a porous body, and the layer not in contact with the first image 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 material for the first layer is not particularly limited, and any of a hydrophilic material having a contact angle with water of less than 90 ° and a water repellent material having a contact angle with water of 90 ° or more is used. be able to.
- the contact angle with water is more preferably 40 ° or less.
- hydrophilic material examples include polyolefin (polyethylene (PE), polypropylene (PP), etc.), polyurethane, nylon, polyamide, polyester (polyethylene terephthalate (PET), etc.), polysulfone (PSF), and the like.
- the material of the first layer is preferably a water-repellent material having a low surface free energy, particularly a fluororesin, in order to suppress adhesion of the coloring material and to improve the cleaning property.
- a 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).
- PTFE polytetrafluoroethylene
- PCTFE polychlorotrifluoroethylene
- PVDF polyvinylidene fluoride
- PVDF polyvinyl fluoride
- 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, there is almost no effect of sucking up the aqueous liquid component by capillary force, and it may take time to suck up the aqueous liquid component when contacting the image for the first time. For this reason, it is preferable to impregnate the first layer with a liquid having a contact angle with the first layer of less than 90 °.
- the liquid that is soaked in the first layer with respect to the first liquid and the optional second liquid in the first image may be referred to as a third liquid.
- the third liquid can be soaked in the first layer by applying from the first surface of the liquid absorbing member.
- the third liquid is preferably prepared by mixing the first liquid (water) with a surfactant or a liquid having a low contact angle with the first layer. Since the third liquid is gradually replaced with the first liquid, the absorption efficiency of the first layer gradually decreases. For this reason, it is preferable to apply the third liquid to the first surface of the liquid absorbing member by the third liquid applying means every predetermined number of times.
- the thickness of the first layer is preferably 50 ⁇ m or less.
- the film thickness is more preferably 30 ⁇ m or less.
- the film thickness can be obtained by measuring the film thickness at any 10 points with a linear micrometer OMV_25 (manufactured by Mitutoyo) and calculating the average value.
- 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 first liquid is equal to or greater than that of the first layer so that the liquid absorbed toward the first layer does not flow backward.
- a low material is preferred.
- 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 have three or more layers.
- the layer after the third layer (also referred to as the third layer) is preferably a nonwoven fabric from the viewpoint of rigidity.
- the same material as the second layer is 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 by heating and bonded and laminated. 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.
- an ink jet recording apparatus As an ink jet recording apparatus, a first image is formed on a transfer body as a recording medium, and the second image after the first liquid (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. 1 is a schematic diagram illustrating an example of a schematic configuration of a transfer type inkjet recording apparatus of the present embodiment.
- the transfer type ink jet recording apparatus 100 includes a transfer body 101 that temporarily holds a first image and a second image obtained by absorbing and removing at least 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 a member;
- 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 the first image is removed through the contact with the liquid absorbing member 105a.
- 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. If the removal of the liquid component is described from a different viewpoint, it can also be expressed as concentrating the ink constituting the 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.
- the second image from which the liquid component has been removed 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 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. In the following description, 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 contacts not only the first image but also the unreacted reaction liquid, 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.
- 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 1 can be composed of a support member 102 and a drive device (not shown) that rotationally drives the support member 102.
- 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. Examples of 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.
- a predetermined amount of a vulcanizing agent, a vulcanization accelerator, and the like are blended, and a filler such as a foaming agent, hollow fine particles, or salt is blended as necessary to make it porous.
- 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.
- 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.
- a reaction liquid applying device 103 that applies a reaction liquid to the transfer body 101.
- 1 is a gravure offset having a reaction solution storage unit 103a that stores a reaction solution, and reaction solution application members 103b and 103c that apply 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 is a member having a semi-cylindrical cross section (partially having a curved surface portion)
- the liquid absorbing member 105a is a belt shape
- the curved surface portion of the pressing member 105b is a liquid absorbing member.
- the liquid absorbing member 105a may be pressed to press the liquid absorbing member 105a against the transfer body 101 while sliding with the 105a (sliding state).
- 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 tension rollers as tension members.
- the pressing member 105b is also a roller member that rotates in the same manner as the stretching roller, but is not limited to this.
- the liquid absorbing device 105 causes the liquid absorbing member 105a to absorb the liquid component contained in the first image by causing the liquid absorbing member 105a having a porous body to be pressed against the first image by the pressing member 105b.
- 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.
- pretreatment means for applying a wetting liquid (third liquid) to the liquid absorbing member (not shown in FIGS. 1 and 2). It is preferable to perform pretreatment according to the figure.
- the wetting liquid used in the present invention preferably contains water and a water-soluble organic solvent.
- 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 application method is not particularly limited, but immersion or droplet dropping is preferable.
- the pressure of the liquid absorbing member indicates the nip pressure between the transfer member 101 and the liquid absorbing member 105a, and is measured by a surface pressure distribution measuring instrument (I-SCAN manufactured by Nitta Co., Ltd.). Pressure measurement was performed, and the value was calculated by dividing the weight in the pressurized region by the area.
- the pressure sensing width in the recording medium conveyance direction is referred to as a nip distance.
- the nip pressure at the nip portion is adjusted so as to obtain a preset pressure change in the conveyance direction of the recording medium that satisfies the relational expressions (1) to (3) described above.
- the nip pressure adjusting unit for satisfying the relational expressions (1) to (3) can be configured to include a recording medium, a liquid absorbing member, and a pressurizing mechanism that presses the liquid absorbing member against the recording medium.
- the pressurizing mechanism can change the nip pressure in the nip portion satisfying the relational expressions (1) to (3) by pressing at least one of the recording medium and the liquid absorbing member with a target pressure when necessary. If it exists, the structure etc.
- a configuration in which a pressing member to which the pressure from the pressurizing mechanism acts is arranged on the surface side of the recording medium facing the surface having the first image, or the recording medium is stretched It is possible to use a form in which a pressing force to the liquid absorbing member by the recording medium is obtained by the member to be recorded.
- a supporting member may be disposed on the opposite side of the pressure acting portion via the recording medium and pressurized.
- FIGS. 6A to 6F An example of a preferred form of a pressurizing mechanism for obtaining a change in nip pressure satisfying the relational expressions (1) to (3) and a positional relationship between the pressing member and the liquid absorbing member are shown in FIGS. 6A to 6F. Shown as a longitudinal section along the direction. Although the recording medium having the first image is omitted in FIGS. 6A to F, the recording medium is formed on the first surface of the porous body of the liquid removing belt 51 which is a belt-like liquid absorbing member. It is conveyed together with the liquid removing belt 51 in the contact state.
- the pressing member 55 (a) in the form shown in FIG. 6A has a curved surface portion along the transport direction on the contact surface with the liquid removing belt 51.
- the pressing member 55 (a) can apply a nip pressure to the nip portion by applying pressure from the surface opposite to the contact surface with the liquid component removing belt 51.
- the contact surface of the pressing member 55 (a) with the liquid removal belt 51 is a sliding surface with respect to the surface on which the first image of the liquid removal belt 51 is formed, and is along the transport direction of the liquid removal belt 51.
- it is formed of a convex curved surface (curved surface portion) protruding toward the liquid removing belt 51 side.
- a peak of a convex curved surface that is, a peak of the thickness of the liquid absorbing member is provided on the downstream side (near end side of the nip portion) of the pressing member 55 (a) in the transport direction of the liquid removal belt 51. It has been. With this shape, it is possible to obtain a change in nip pressure that satisfies the relational expressions (1) to (3).
- the cross-sectional shape of the pressing member 55 (a) at an arbitrary position in the direction intersecting the transport direction of the liquid removal belt 51 is the same.
- the pressing member 55 (b) shown in FIG. 6B is provided with a notch in a part of the convex curved surface protruding toward the liquid component removing belt 51 in a direction crossing the conveying direction, and the pressure is once released. Or having a shape capable of applying a plurality of peak pressures.
- the pressing member 55 (a) can be configured to pressurize the liquid component removing belt 51 via the conveyance auxiliary belt 53. It is preferable that the conveyance auxiliary belt 53 maintains a contact state with the liquid component removing belt 51 and has lubricity (sliding property) with respect to the pressing member 55 (a). By using such a conveyance auxiliary belt, wear of the pressing member can be suppressed.
- the lubricity of the contact surface of the conveyance assist belt with the pressing member can be obtained by a method of forming the contact surface with a material having lubricity or a method of adding a lubricant.
- the material of the auxiliary conveying belt is not particularly limited.
- endless belt-shaped polyimide belt endless belt-shaped urethane rubber coated with silicone rubber, PET film laminated with silicone rubber, urethane
- a laminated material in which a polysiloxane compound is formed on a rubber sheet is preferably used.
- FIG. 6D to 6F show a configuration using a plurality of pressing members.
- FIG. 6D shows a configuration in which the pressure roller 57 and the pressing members 55 (a) and (b) are combined with the pressing members 55 (c) having different curvatures of the curved surface portions in contact with the liquid removing belt 51.
- FIG. 6E shows a configuration in which two pressure rollers 56 and 57 are provided as pressing members.
- FIG. 6F shows a configuration in which three pressure rollers 56, 57, and 58 are provided.
- the above-described relational expression ((3) can also be obtained by selecting a plurality of pressing members with respect to the transport direction of the liquid component removing belt 51 by selecting a size and a pressing force that can achieve a desired nip pressure change.
- a change in nip pressure satisfying 1) to (3) can be obtained.
- the nip portion can include a portion where no nip pressure is applied, as shown in FIGS. 6B and DF.
- FIG. 7A shows a schematic example of the profile of the nip pressure change obtained by the form of the pressing member shown in FIG. 6A.
- FIG. 7B shows a schematic example of the profile of the nip pressure change obtained by the form of the pressing member provided with one notch in the form in FIG. 6B.
- FIG. 7F shows a schematic example of the profile of the nip pressure change obtained by the form of the pressing member provided with two similar notches.
- FIGS. 7B, 7C, and 7E show schematic examples of nip pressure change profiles obtained by using a plurality of rollers as pressing members as shown in FIGS. 6E and 6F, respectively.
- FIG. 7D shows a schematic example of a profile of nip pressure change obtained by changing the curvature of the curved surface portion that contacts the liquid removing belt of the pressing member.
- the wear of the liquid removing belt 51 is suppressed by the configuration using the pressure roller as the pressing member.
- the first pressure roller 56 is preferably a roller having a larger diameter than the second pressure roller 57 in order to reduce the force in the direction of sweeping the image in the process in which the transfer body 101 enters the nip. . Furthermore, since a force for pulling the liquid component toward the porous body is applied during nip peeling, the contact pressure of the second pressure roller 57 with the transfer body 101 is greater than the contact pressure of the first pressure roller 56 with the transfer body. (A schematic example of the nip pressure change profile is shown in FIGS. 7C and 7E).
- the pressure peak close to the exit side of the transfer body 101 in the liquid removal step is the maximum pressure among the contact pressures of the liquid removal belt 51 and the recording medium. preferable.
- 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 action time be 3 ms or longer because the liquid absorbing member 105a can be stably brought into contact with the first image.
- 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 in which the liquid content is reduced is formed.
- the second image is then transferred onto the recording medium 108 at the transfer portion.
- the apparatus configuration and conditions during transfer will be described.
- 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). A value is calculated by performing measurement and dividing the conveyance direction length of the pressurizing region by the conveyance speed.
- 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 preferably 9.8 N / cm 2 (1 kgf / cm 2 ) or more and 294.2 N / cm 2 (30 kgf / cm 2 ) or less.
- 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 means 107 for conveying the recording medium 108 is constituted by a recording medium feeding roller 107a and a recording medium take-up roller 107b. However, it is sufficient that the recording medium can be conveyed. It is not limited.
- FIG. 3 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. 4 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.
- the recording medium is a recording medium on which an image is to be formed.
- FIG. 2 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 ink jet recording apparatus does not have the transfer body 101, the support member 102, and the transfer body cleaning means 109 as compared with the transfer type ink jet recording apparatus described above, except that an image is formed on the recording medium 208.
- 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 comes into contact with the first image on the recording medium 208 are used.
- the liquid absorbing device 205 that absorbs the liquid component contained in one image has the same configuration as that of the transfer type ink jet recording device, and the description thereof is 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.
- the ink applying unit 204 is opposed to an ink applying unit that applies ink to the recording medium 208, and a liquid component removing unit that removes the liquid component by bringing the liquid absorbing member 205a into contact with the first image on the recording medium.
- a recording medium support member (not shown) that supports the recording medium from below may be provided at the position.
- the recording medium conveying device 207 constitutes a recording medium conveying unit which is a recording medium.
- the configuration of the recording medium conveyance device 207 is not particularly limited, and a conveyance unit in a known direct drawing type inkjet recording device can be used.
- a recording medium conveying apparatus having a recording medium feeding roller 207a, a recording medium winding roller 207b, and recording medium conveying 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. 2 is as shown in FIG. 3 as in the case of the transfer type ink jet recording apparatus shown in FIG.
- FIG. 5 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, a ROM 502 stores a control program for the CPU, and a RAM 503 executes a 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.
- the transfer type ink jet recording apparatus shown in FIG. 1 was used.
- the transfer body 101 in this embodiment is fixed to 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).
- An atmospheric pressure plasma treatment is performed so that the contact angle of water on the surface of the elastic layer is 10 degrees or less, the above mixture is applied onto the elastic layer, UV irradiation (high pressure mercury lamp, integrated exposure 5000 mJ / cm 2 ), A film 101 was formed by thermal curing (150 ° C. for 2 hours) to produce a transfer body 101 having a surface layer having a thickness of 0.5 ⁇ m formed on an elastic body.
- the reaction solution applied by the reaction solution applying means 103 was of the following composition, and the application amount 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.
- the ink application means C an ink jet head that discharges ink in an on-demand system using an electro-thermal conversion element was used, and the ink application amount was 20 g / m 2 .
- the liquid absorbing member 105a was 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.
- 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 .
- FIG. 6A the detailed structure of the liquid component removal method in a present Example is shown using FIG. 6A.
- the arrows in the drawing indicate the conveyance direction of the transfer body 101.
- a first porous body composed of two layers of a first layer 1 and a second layer 2 was used.
- the liquid content of the ink can be absorbed and the image can be concentrated.
- the pore diameter of the first layer in this example, PTFE having a pore diameter of 0.2 ⁇ m and a thickness of 10 ⁇ m obtained by stretching a resin on the first layer 1 is used.
- a nonwoven fabric made of a PET material having a thickness of 20 ⁇ m and a thickness of 190 ⁇ m was used. Then, the liquid layer removing belt 51 was prepared by laminating and integrating the first layer and the second layer. In this embodiment, the Gurley value defined by JIS P8117 of the liquid component removal belt 51 is 8 seconds. Table 1 summarizes the configuration of the liquid removal belt 51.
- the liquid absorbing member 105a is adjusted to have a speed equivalent to the moving speed of the transfer body 101 by the transport rollers 105c, 105d, and 105e that transport the liquid removal belt 51 while stretching it.
- 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 0.7 m / s
- aurora-coated paper manufactured by Nippon Paper Industries Co., Ltd., basis weight 104 g / m 2 ) was used as the recording medium 108.
- the shape on the outlet side has a small curvature.
- FIG. 7A shows an outline of the nip pressure change profile
- the liquid removing belt 51 was immersed in a wetting liquid consisting of 95 parts of ethanol and 5 parts of water and infiltrated, and then replaced with a liquid consisting of 100 parts of water, and then used for liquid removal. Images obtained through the liquid absorption treatment were evaluated according to criteria described later.
- Example 2 to 4 the level was changed by changing the curvature on the entrance side and the curvature on the exit side of the transfer body 101 in the curved surface portion of the pressing member so as to satisfy the above relational expressions (1) to (3). .
- image formation and evaluation of the formed image were performed in the same manner as in Example 1.
- Example 5 Using the pressing member in Example 3, the angle and pressure with respect to the transfer body 101 were adjusted. Otherwise, image formation and evaluation of the formed image were performed in the same manner as in Example 1.
- FIG. 8A shows the relationship between the nip distance and the pressure in the liquid removal steps of Examples 1 to 5.
- FIG. 8B shows the relationship between the nip distance and the pressure in the liquid removal process of Comparative Examples 1 to 3.
- Image disorder The image after the liquid removal treatment was observed and evaluated according to the following criteria. No image distortion due to image sweeping: A Image disturbance caused by sweeping only the rear edge of the image: B Image disturbance due to sweeping of entire image: C
- Example 6 A similar experiment was conducted using the direct drawing type ink jet recording apparatus shown in FIG. 2 in which the reaction liquid was directly applied to the recording medium and the ink was applied instead of the transfer type.
- the image evaluation in the direct drawing type ink jet recording apparatus shown in FIG. 2 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 unit 203, the ink composition, the ink application unit 204, the recording medium conveyance speed, and the liquid removal unit 205 are the same as those in the transfer type inkjet recording apparatus used in Example 1. It has become. As a result, it was confirmed that the same results as in Table 2 were obtained.
- the nip pressure in the conveyance direction of the recording medium in the nip portion in the nip portion formed by the porous body and the recording medium for absorbing and removing the liquid component from the image is determined in advance. Have changed. Due to the nip pressure change, the force in the direction of sweeping the image to be processed as the object of absorption removal processing is reduced in the process in which the recording medium enters the nip portion with the liquid absorbing member. For this reason, the disturbance of the image to be processed due to the contact of the porous body of the liquid absorbing member with the image to be processed is suppressed. Furthermore, when the liquid absorbing member is peeled from the recording medium from the nip portion, the force that pulls the liquid component toward the porous body acts effectively, so that it is possible to effectively absorb and remove the liquid component from the processed image. Become.
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Abstract
Description
被記録体上に第一の液体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、
前記第一の画像と接触する第一の面を有し、前記第一の画像から前記第一の液体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、
前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記第一の画像が形成された面とを接触させてニップ部を形成するニップ部形成ユニットと、
該ニップ部に前記第一の画像を通過させて前記第一の画像と前記多孔質体の第一の面を接触させる被記録体を搬送する搬送ユニットと、
を備える画像形成装置であって、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)よりも小さい、
ことを特徴とする。
被記録体上に第一の液体と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の有する多孔質体の第一の面を、前記第一の画像に接触させて、前記第一の画像から前記第一の液体の少なくとも一部を該多孔質体により吸収する液吸収工程と、
を有する画像形成方法であって、
前記液吸収工程は、前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記第一の画像が形成された面とを接触させてニップ部を形成し、該ニップ部に前記第一の画像を通過させて前記第一の画像と前記多孔質体の第一の面を接触させることにより行われ、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録媒体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録媒体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)より小さい、
ことを特徴とする。
本発明にかかる画像形成方法は、被記録体上に第一の液体と色材とを含む第一の画像を形成する画像形成工程と、液吸収部材の有する多孔質体の第一の面を、第一の画像に接触させて、第一の画像から第一の液体の少なくとも一部を該多孔質体により吸収する液吸収工程と、を有する。
A<B ・・・・・・・(1)
A=P1/X1 ・・・(2)
B=P2/X2 ・・・(3)
P1:ニップ部の被記録体の入口側に近接するニップ圧力ピーク
X1:多孔質体の第一の面と被記録体の接触開始からP1までのニップ距離
P2:ニップ部の被記録体の出口側に近接するニップ圧力ピーク
X2:P2から多孔質体と被記録媒体とが離間するまでのニップ距離
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。
インクジェット記録部を構成する、インクを付与するインク付与装置として、インクジェット法によって液体の吐出を行う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として、顔料又は染料と顔料との混合物を用いることができる。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疎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疎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、疎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ることができる。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。
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。
本発明に用いるインクは溶剤として水、水と水溶性有機溶剤の混合物等の水性液媒体を含むことができる。水は、イオン交換等により脱イオンした水であることが好ましい。また、インク中の水の含有量は、インク全質量に対して30質量%以上97質量%以下であることが好ましく、インク全質量に対して50質量%以上95質量%以下であることがより好ましい。
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、第一の画像から第一の液体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。
本発明に係る液吸収部材の多孔質体は、第一の面側の平均孔径が、第一の面と対向する第二の面側の平均孔径よりも小さい物を使用することが好ましい。多孔質体へのインクの色材の付着を抑制するため、孔径は小さいことが好ましく、少なくとも画像と接触する第一の面側の多孔質体の平均孔径は、10μm以下であることが好ましい。一方、多孔質体への液体分の吸収性を向上させるため、少なくとも画像と接触する第一の面側の多孔質体の平均孔径は、0.05μm以上であることが好ましい。なお、本発明において平均孔径とは第一の面または第二の面の表面での平均直径のことを示し、公知の手段、例えば水銀圧入法や、窒素吸着法、SEM画像観察等で測定可能である。
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。
本発明において、第一の層の材料は特に限定されることはなく、水に対する接触角が90°未満の親水性材料と、水に対する接触角が90°以上の撥水性材料のいずれも使用することができる。親水性材料の場合、水に対する接触角が40°以下であることがより好ましい。第一の層が親水性材料で構成されている場合、毛管力により水性液体成分を吸い上げる効果がある。
第一の層が撥水性材料で構成されている場合、毛管力により水性液体成分を吸い上げる効果が殆どなく、初めて画像と接触する際に水性液体成分の吸い上げに時間を要することがある。このため、第一の層中に第一の層との接触角が90°未満である液体をしみ込ませておくことが好ましい。第一の画像中の第一の液体及び任意の第二の液体に対して、第一の層中にしみ込ませておく液体を第三の液体ということがある。第三の液体は、液吸収部材の第一の面から塗布することで第一の層中にしみ込ませておくことができる。第三の液体は、第一の液体(水)に界面活性剤や第一の層との接触角の低い液体を混合して調製することが好ましい。第三の液体は、第一の液体で徐々に置換されるため、徐々に第一の層の吸収効率が低下していく。このため、所定の回数毎に第三の液体の塗布手段より第三の液体を液吸収部材の第一の面に塗布することが好ましい。
本発明において、第二の層は通気性を持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、第一の層に対して第一の液体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が用いられる。
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、特に限定されることはない。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。
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、液吸収部材により第一の液体(水性液体成分)が吸収された後の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。なお、本発明において、前者のインクジェット記録装置を、以下便宜的に転写型インクジェット記録装置と称し、後者のインクジェット記録装置を、以下便宜的に直接描画型インクジェット記録装置と称する。
図1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吸収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を備えた転写ユニットを含む。
液体成分の除去を異なる視点で説明すれば、転写体上に形成された第一の画像を構成するインクを濃縮するとも表現することができる。インクを濃縮するとは、インクに含まれる液体成分が減少することによって、インクに含まれる色材や樹脂といった固形分の液体成分に対する含有割合が増加することを意味する。
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。反応液の濡れ性、転写性等を向上させるために、表面処理を施して用いてもよい。表面処理としては、フレーム処理、コロナ処理、プラズマ処理、研磨処理、粗化処理、活性エネルギー線照射処理、オゾン処理、界面活性剤処理、シランカップリング処理などが挙げられる。これらを複数組み合わせてもよい。また、表面層に任意の表面形状を設けることもできる。
転写体の大きさは、目的の印刷画像サイズに合わせて自由に選択することができる。転写体の形状としては、特に制限されず、具体的にはシート形状、ローラ形状、ベルト形状、無端ウェブ形状等が挙げられる。
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1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1に示すように、押圧部材105bを断面がかまぼこ形状(部分的に曲面部を有する形状)の部材とし、液吸収部材105aをベルト形状とし、押圧部材105bの曲面部を液吸収部材105aと摺動させながら(摺動状態)、液吸収部材105aを押圧して液吸収部材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。
本実施形態において、多孔質体を有する液吸収部材105aを第一の画像に接触させる前に、液吸収部材に湿潤液(第三の液体)を付与する前処理手段(図1および2では不図示)によって前処理を施すことが好ましい。本発明に用いる湿潤液は、水及び水溶性有機溶剤を含有することが好ましい。水は、イオン交換等により脱イオンした水であることが好ましい。また、水溶性有機溶剤の種類は特に限定されず、エタノールやイソプロピルアルコール等の公知の有機溶剤をいずれも用いる事ができる。本発明に用いる液吸収部材の前処理において、付与方法は特に限定されないが、浸漬や液滴滴下が好ましい。
転写体上の第一の画像に対して押圧する液吸収部材の圧力が2.94N/cm2(0.3kgf/cm2)以上であれば、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。尚、本発明における液吸収部材の圧力とは、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って、値を算出した。
上述した面圧測定における、被記録媒体の搬送方向における圧力感知幅をニップ距離と称す。
ニップ部におけるニップ圧は、先に挙げた関係式(1)~(3)を満たす予め設定された被記録体の搬送方向における圧力変化が得られるように調整される。関係式(1)~(3)を満たすためのニップ圧調整部は、被記録体、液吸収部材及び液吸収部材を被記録体へ押圧する加圧機構を有して構成することができる。加圧機構は、被記録体及び液吸収部材の少なくとも一方を必要時に目的とする圧力で押圧して関係式(1)~(3)を満たすニップ部にニップ圧力変化を与えることができるものであれば、油圧方式による加圧装置に押圧部材を接続した構成等が利用でき、特に限定されない。被記録体側から押圧する場合には、被記録体の第一の画像を有する面と対向する面側に加圧機構からの圧力が作用する押圧部材を配置する形態や、被記録体を架張する部材によって被記録体による液吸収部材への押圧力を得る形態を利用することができる。
また、液吸収部材に加圧機構から圧力をかける場合には、圧力作用部に対して被記録体を介した反対側に支持部材を配置して加圧してもよい。
なお、ニップ部は、図6B、D~Fに示す通り、ニップ圧がかからない部分を含むことができる。
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。また、作用時間は3ms以上であれば、第一の画像に液吸収部材105aを安定的に接触させることができるため好ましい。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。
このようにして、転写体101上には、第一の画像から液体成分が吸収され、液体分の減少した第二の画像が形成される。第二の画像は次に転写部において記録媒体108上に転写される。転写時の装置構成及び条件について説明する。
本実施形態では、第二の画像と記録媒体搬送手段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。
転写体101上の第二の画像を記録媒体108に転写するために押圧部材106が押圧しているときの温度についても特に制限はないが、インクに含まれる樹脂成分のガラス転移点以上又は軟化点以上であることが好ましい。また、加熱には転写体101上の第二の画像、転写体101及び記録媒体108を加熱する加熱手段を備える態様が好ましい。
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。
また、図1において、記録媒体108を搬送するための記録媒体搬送手段107は、記録媒体繰り出しローラ107aおよび記録媒体巻き取りローラ107bによって構成されているが、記録媒体を搬送できればよく、この構成に限定されるものではない。
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3は図1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3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。
401はプリンタ全体を制御するCPU、402はCPUの制御プログラムを格納するためのROM、403はプログラムを実行するためのRAMである。404はネットワークコントローラ、シリアルIFコントローラ、ヘッドデータ生成用コントローラ、モーターコントローラ等を内蔵した特定用途向けの集積回路(Application Specific Integrated Circuit:ASIC)である。405は液吸収部材搬送モータ406を駆動するための液吸収部材搬送制御部であり、ASIC404からシリアルIFを介して、コマンド制御される。407は転写体駆動モータ408を駆動するための転写体駆動制御部であり、同様にASIC404からシリアルIFを介してコマンド制御される。409はヘッド制御部であり、インクジェットデバイス305の最終吐出データ生成、駆動電圧生成等を行う。
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が被記録体である記録媒体の搬送ユニットを構成している。この記録媒体搬送装置207の構成は、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手段を用いることができる。例として、図2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2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1に示す転写型インクジェット記録装置と同様に、図3に示す通りである。
本実施例における転写体101は接着剤により支持部材102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度以下となるように大気圧プラズマ処理を行い、上記の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、弾性体上に厚さ0.5μmの表面層を形成した転写体101を作製した。
・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 残部
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
これを十分撹拌して分散した後、ポアサイズ3.0μmのミクロフィルター(富士フイルム株式会社製)にて加圧ろ過を行い、ブラックインクを調製した。
液吸収部材105aは液吸収部材搬送ローラ105c、105d、105eによって、転写体101の移動速度と同等の速度になるよう調節した。また、転写体101の移動速度と同等の速度となるように、記録媒体108は記録媒体繰り出しローラ107aおよび記録媒体巻き取りローラ107bによって搬送される。本実施例において、搬送速度は0.2m/sとし、記録媒体108としてオーロラコート紙(日本製紙株式会社製・坪量104g/m2)を用いた。
次に、図6Aを用いて、本実施例における液体分除去方法の詳細構成を示す。図中の矢印は転写体101の搬送方向を示している。
図6Aに示される液体分除去ベルト51として、第一の層1と第二の層2の二層からなる第一の多孔質体を用いた。液体分除去ベルト51の第一の層1を図示しない画像に接触させることで、インクの液体分を吸収し、画像を濃縮することができる。第一の層1の孔径について、本実施例では、第一の層1に樹脂を延伸する事により得られた孔径0.2μm、厚さ10μmのPTFEを用い、第二の層2には孔径20μm、厚さ190μmのPET材からなる不織布とした。そして、この第一の層と第二の層を熱圧ラミネートし一体化したものを液体分除去ベルト51に用いた。本実施例において、液体分除去ベルト51の、JIS P8117で規定されるガーレ値は8秒である。表1に液体分除去ベルト51の構成をまとめた。
液吸収処理を経て得られた画像について後述する基準による評価を行った。
実施例2~4においては、先の関係式(1)~(3)を満たすように、押圧部材の曲面部において転写体101の入り口側の曲率及び出口側の曲率を変えて水準を振った。それ以外は実施例1と同様に画像形成及び形成された画像の評価を行った。
実施例3における押圧部材を用いて、転写体101に対する角度及び圧力を調整した。それ以外は実施例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。
液体分除去工程に1本の加圧ローラを用いて、液体分除去ベルト51と転写体101の接触開始から転写体101の入口側に近接する圧力ピークに到達するまでの圧力の比率(A)と、転写体101の出口側に近接する圧力ピークから離間までの圧力の比率(B)が同じとなるようにした。それ以外は実施例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。
液体分除去ベルト51と転写体101の接触開始から転写体101の入口側に近接する圧力ピークに到達するまでの圧力の比率(A)が、転写体101の出口側に近接する圧力ピークから離間までの圧力の比率(B)より小さくなるように、押圧部材の曲面部における転写体101の入り口側の曲率及び出口側の曲率を変えた。それ以外は実施例1と同様にして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液体除去処理後における画像の掃き寄せによる画像乱れの発生と、液体分除去率について評価した。
液体除去処理後の画像を観察し、以下の基準により評価した。
画像の掃き寄せによる画像乱れなし:A
画像の後端部のみ掃き寄せによる画像乱れ発生:B
画像全体の掃き寄せによる画像乱れ発生:C
液体分除去率は、インクの打込み量W1とインクを打ち込み前の転写体重量W2と液体分除去後のインクを含めた転写体重量W3から以下の式(A)により算出した。
液体分除去率[%]=(W1+W2-W3)/W1×100 ・・・式(A)
得られた液体分除去率に基づいて以下の基準による評価を行った。
液体分除去率70%以上のより望ましいレベル:A
液体分除去率40%以上70%未満の望ましいレベル:B
液体分除去率40%未満であるレベル:C
得られた評価結果を表2に示す。
転写型ではなく、直接記録媒体に反応液を塗布し、インクを付与する図2に示す直接描画型インクジェット記録装置を用いて同様の実験を行った。図2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。
53 搬送補助ベルト
55(a)、(b) 押圧部材
56 第一の加圧ローラ
57 第二の加圧ローラ
58 第三の加圧ローラ
105 液吸収装置
105a 液吸収部材
105b 押圧部材
105c、d、e 張架ローラ
205 液吸収装置
205a 液吸収部材
205b 押圧部材
205c、d、e、f、g 張架ローラ
Claims (20)
- 被記録体上に第一の液体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、
前記第一の画像と接触する第一の面を有し、前記第一の画像から前記第一の液体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、
前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記第一の画像が形成された面とを接触させてニップ部を形成するニップ部形成ユニットと、
該ニップ部に前記第一の画像を通過させて前記第一の画像と前記多孔質体の第一の面を接触させる被記録体を搬送する搬送ユニットと、
を備える画像形成装置であって、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)よりも小さい、
ことを特徴とする画像形成装置。 - 前記圧力ピークP2は、前記被記録体と前記多孔質体の接触圧の中で最大圧力である、ことを特徴とする請求項1に記載の画像形成装置。
- 前記多孔質体の第一の面と対向する第二の面を押圧して前記ニップ部を形成する1つ以上の加圧ローラを有する、ことを特徴とする請求項1に記載の画像形成装置。
- 前記多孔質体の第一の面と対向する第二の面を摺動状態で押圧して前記ニップ部を形成する押圧部材を有する、ことを特徴とする請求項1に記載の画像形成装置。
- 前記画像形成ユニットは、
前記第一の液体または第二の液体を含む第一の液体組成物を前記被記録体上に付与する第一の液体付与部と、
前記第一の液体または第二の液体と前記色材とを含む第二の液体組成物を前記被記録体上に付与する第二の液体付与部と、
を含み、
前記第一の液体組成物及び前記第二の液体組成物の少なくとも一方は、前記第一の液体を含み、
前記第一の画像は、前記第一の液体組成物及び前記第二の液体組成物の混合物を含み、前記第一の液体組成物及び前記第二の液体組成物よりも粘稠である、
ことを特徴とする請求項1に記載の画像形成装置。 - 前記第二の液体組成物は、前記第一の液体として水を含み、前記色材として少なくとも顔料を含む、水性顔料インクであり、前記第一の液体組成物は、前記水性顔料インク中の顔料の分散安定性を低下させる反応液である、ことを特徴とする請求項5に記載の画像形成装置。
- 前記第一の液体付与部はインクジェット記録部である、ことを特徴とする請求項6に記載の画像形成装置。
- 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第一の液体を吸収した第二の画像とを一時的に保持する転写体であり、該転写体上の前記第二の画像は記録媒体上に転写される、ことを特徴とする請求項1に記載の画像形成装置。
- 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第一の液体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が形成される、ことを特徴とする請求項1に記載の画像形成装置。
- 被記録体上に水性液体成分と色材とを含むインク像を形成する画像形成ユニットと、
前記インク像と接触する第一の面を有し、前記インク像から前記水性液体成分の少なくとも一部を吸収することによって前記インク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、
前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記インク像が形成された面とを接触させてニップ部を形成するニップ部形成ユニットと、
該ニップ部に前記インク像を通過させて前記インク像と前記多孔質体の第一の面を接触させる被記録体を搬送する搬送ユニットと、
を備える画像形成装置であって、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)より小さい、
ことを特徴とする画像形成装置。 - 被記録体上に第一の液体と色材とを含む第一の画像を形成する画像形成工程と、
液吸収部材の有する多孔質体の第一の面を、前記第一の画像に接触させて、前記第一の画像から前記第一の液体の少なくとも一部を該多孔質体により吸収する液吸収工程と、
を有する画像形成方法であって、
前記液吸収工程は、前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記第一の画像が形成された面とを接触させてニップ部を形成し、該ニップ部に前記第一の画像を通過させて前記第一の画像と前記多孔質体の第一の面を接触させることにより行われ、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録媒体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録媒体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)より小さい、
ことを特徴とする画像形成方法。 - 前記圧力ピークP2は、前記被記録媒体と前記多孔質体の接触圧の中で最大圧力である、ことを特徴とする請求項11の画像形成方法。
- 前記ニップ部を、前記多孔質体の第一の面と対向する第二の面を押圧する1つ以上の加圧ローラにより形成する、ことを特徴とする請求項11に記載の画像形成方法。
- 前記ニップ部を、前記多孔質体の第一の面と対向する第二の面を摺動状態で押圧する押圧部材により形成する、ことを特徴とする請求項11に記載の画像形成方法。
- 前記画像形成工程は、
前記第一の液体または第二の液体を含む第一の液体組成物を前記被記録体上に付与する第1の付与工程と、
前記第一の液体または第二の液体と前記色材とを含む第二の液体組成物を前記被記録体上に付与する第2の付与工程と、
を含み、
前記第一の液体組成物及び前記第二の液体組成物の少なくとも一方は、前記第一の液体を含み、
前記第一の画像は、前記第一の液体組成物及び前記第二の液体組成物の混合物を含み、前記第一の液体組成物及び前記第二の液体組成物よりも粘稠である、
ことを特徴とする請求項11に記載の画像形成方法。 - 前記第二の液体組成物は、前記第一の液体として水を含み、前記色材として少なくも顔料を含む、水性顔料インクであり、前記第一の液体組成物は、前記顔料水性インク中の顔料の分散安定性を低下させる反応液である、ことを特徴とする請求項15に記載の画像形成方法。
- 前記顔料水性インクの前記被記録体への付与はインクジェット法により行われる、ことを特徴とする請求項16に記載の画像形成方法。
- 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第一の液体を吸収した第二の画像とを一時的に保持する転写体であり、該転写体上の前記第二の画像が記録媒体に転写される、ことを特徴とする請求項11に記載の画像形成方法。
- 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が形成される、ことを特徴とする請求項11に記載の画像形成方法。
- 被記録体上に水性液体成分と色材とを含むインク像を形成する画像形成工程と、
液吸収部材の有する多孔質体の第一の面を、前記インク像に接触させて、前記インク像から前記水性液体成分の少なくとも一部を該多孔質体により吸収することによって前記インク像を構成するインクを濃縮する液吸収工程と、
を有する画像形成方法であって、
前記液吸収工程は、前記液吸収部材の多孔質体から形成される第一の面と該第一の面に対向する前記被記録体の前記第一の画像が形成された面とを接触させてニップ部を形成し、該ニップ部に前記第一の画像を通過させて前記第一の画像と前記多孔質体の第一の面を接触させることにより行われ、
前記多孔質体の第一の面と前記被記録体との接触開始から前記ニップ部の前記被記録体の入口側に近接するニップ圧力ピークP1までのニップ距離X1に対する圧力ピークP1の比率A(=P1/X1)は、前記被記録媒体の出口側に近接する圧力ピークP2から前記多孔質体と前記被記録媒体とが離間するまでのニップ距離X2に対する圧力ピークP2の比率B(=P2/X2)より小さい、
ことを特徴とする画像形成方法。
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BR112018013647A BR112018013647A2 (pt) | 2016-01-05 | 2016-12-28 | aparelho de formação de imagem e método de formação de imagem |
CN201680078088.6A CN108472953B (zh) | 2016-01-05 | 2016-12-28 | 图像形成装置和图像形成方法 |
US16/026,215 US10723122B2 (en) | 2016-01-05 | 2018-07-03 | Image forming apparatus and image forming method |
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CN (1) | CN108472953B (ja) |
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EP3401104A4 (en) | 2016-01-05 | 2019-08-14 | C/o Canon Kabushiki Kaisha | INK JET RECORDING APPARATUS AND INK JET RECORDING METHOD |
EP3401098A4 (en) | 2016-01-05 | 2019-05-22 | C/o Canon Kabushiki Kaisha | INK JET RECORDING DEVICE AND METHOD |
WO2017131072A1 (ja) | 2016-01-29 | 2017-08-03 | キヤノン株式会社 | インクジェット記録装置 |
JP2017213857A (ja) | 2016-02-15 | 2017-12-07 | キヤノン株式会社 | インクジェット記録装置及びインクジェット記録方法 |
JP6921657B2 (ja) | 2017-07-04 | 2021-08-18 | キヤノン株式会社 | インクジェット記録装置及びインクジェット記録方法 |
JP2019014244A (ja) | 2017-07-04 | 2019-01-31 | キヤノン株式会社 | インクジェット記録方法、及び、インクジェット記録装置 |
JP2019014074A (ja) | 2017-07-04 | 2019-01-31 | キヤノン株式会社 | 液体吐出装置 |
JP2019014091A (ja) | 2017-07-04 | 2019-01-31 | キヤノン株式会社 | 記録装置、液吸収装置及び制御方法 |
JP2019065087A (ja) * | 2017-09-28 | 2019-04-25 | セイコーエプソン株式会社 | 反応液及び記録方法 |
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2017
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EP3401099A4 (en) | 2019-07-03 |
KR102060263B1 (ko) | 2020-02-20 |
RU2687790C1 (ru) | 2019-05-16 |
JP6821439B2 (ja) | 2021-01-27 |
BR112018013647A2 (pt) | 2019-01-22 |
JP2017213849A (ja) | 2017-12-07 |
CN108472953B (zh) | 2020-01-17 |
US20180326756A1 (en) | 2018-11-15 |
KR20180097736A (ko) | 2018-08-31 |
CN108472953A (zh) | 2018-08-31 |
US10723122B2 (en) | 2020-07-28 |
EP3401099A1 (en) | 2018-11-14 |
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