EP4163725B1 - Procédé de formation d'images - Google Patents

Procédé de formation d'images

Info

Publication number
EP4163725B1
EP4163725B1 EP22195271.6A EP22195271A EP4163725B1 EP 4163725 B1 EP4163725 B1 EP 4163725B1 EP 22195271 A EP22195271 A EP 22195271A EP 4163725 B1 EP4163725 B1 EP 4163725B1
Authority
EP
European Patent Office
Prior art keywords
toner
image
undercoat layer
temperature
image forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22195271.6A
Other languages
German (de)
English (en)
Other versions
EP4163725A1 (fr
Inventor
Akihiro Kaneko
Kazumi Suzuki
Toyoshi Sawada
Katsunori Kurose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of EP4163725A1 publication Critical patent/EP4163725A1/fr
Application granted granted Critical
Publication of EP4163725B1 publication Critical patent/EP4163725B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6582—Special processing for irreversibly adding or changing the sheet copy material characteristics or its appearance, e.g. stamping, annotation printing, punching
    • G03G15/6585—Special processing for irreversibly adding or changing the sheet copy material characteristics or its appearance, e.g. stamping, annotation printing, punching by using non-standard toners, e.g. transparent toner, gloss adding devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00523—Other special types, e.g. tabbed
    • G03G2215/00527—Fabrics, e.g. textiles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00789—Adding properties or qualities to the copy medium
    • G03G2215/00801—Coating device

Definitions

  • the present disclosure relates to an image forming method.
  • an electrostatic latent image is formed on an electrostatic latent image bearer (also referred to as "photoconductor") containing a photoconductive substance, then the electrostatic latent image is developed with a developer containing a toner to form a toner image, and the toner image is transferred to a transfer material such as paper and then fixed to the transfer material by heating and pressurization to form a fixed image.
  • an electrostatic latent image bearer also referred to as "photoconductor”
  • the electrostatic latent image is developed with a developer containing a toner to form a toner image
  • the toner image is transferred to a transfer material such as paper and then fixed to the transfer material by heating and pressurization to form a fixed image.
  • a toner set containing cyan, magenta, yellow, and black toners referred to as process colors in combination is generally used.
  • Japanese Patent No. 5847277 describes an image forming method in which a first developer image is formed on a transfer medium using a color developer, then a second developer image is formed on the first developer image using a white developer, which is thermally transferred to a fabric.
  • EP-A-3686680 discloses an image forming apparatus including: a first image forming unit that forms a clear toner image with a clear toner; a second image forming unit that forms a color toner image with a color toner; a transfer unit that transfers at least one of the clear toner image and the color toner image onto a medium; and a controller that controls formation of the clear toner image and the color toner image.
  • adhesiveness is firm so that the image can be fixed to fabric fibers with many irregularities and is not peeled off by washing, and when printing an image on a fabric with various colors, especially a deep-colored fabric, the color of the deep-colored fabric is opacified to prevent impairment of image colors.
  • an image forming method should be very carefully selected. A practical and simple method for forming images on fabric, which clears up these problems has not yet been proposed, and no practical method has been provided.
  • An object of the present disclosure is to solve the aforementioned problems .
  • an object of the present disclosure is to provide an image forming method allowing formation of images that can be fixed to fabric media to which images have not fixed by conventional image forming methods, the images exhibiting adequate washing resistance and having adequate chroma even on a deep-colored fabric medium.
  • the invention is set out in the appended set of claims.
  • the present disclosure provides images that can be fixed to fabric media to which images have not fixed by conventional image forming methods, the images exhibiting adequate washing resistance and having adequate chroma even on a deep-colored fabric.
  • the image forming method according to the present disclosure refers to a method for transferring and fixing an image on a transfer medium to an image receiving substrate, including a series of the following processes 1 to 4:
  • the electrophotographic image forming apparatus may be any apparatus that can print process color toners and undercoat layer toners on a transfer medium.
  • a printer may be used that has improved such that an undercoat layer toner and an image forming toner can be set to stations for any color in RICOH Pro C7200S manufactured by RICOH COMPANY,LTD., or the like.
  • image receiving substrate in the present disclosure all of artificial and natural fibers such as cotton, polyester, and silk can be used.
  • transfer paper or release paper with surface treatment having appropriate fixability and mold-releasing property adaptable to the aforementioned image forming process
  • transfer paper or release paper with surface treatment having appropriate fixability and mold-releasing property adaptable to the aforementioned image forming process
  • transfer paper or release paper with surface treatment having appropriate fixability and mold-releasing property adaptable to the aforementioned image forming process
  • a transfer medium for example, transfer paper or release paper with surface treatment, having appropriate fixability and mold-releasing property adaptable to the aforementioned image forming process
  • transfer paper or release paper with surface treatment having appropriate fixability and mold-releasing property adaptable to the aforementioned image forming process
  • aforementioned image forming process can be used, such as WOW LIGHT 8.0, WOWi SHEET 7A, and WOWm SHEET 7 manufactured by Piotec Co.,Ltd., and CLAPp-MULT manufactured by EUROPORT.Co.Ltd.
  • Heating and pressing means may be any means that can provide a temperature and a pressure suitable for fixing the toner to the image receiving substrate, and, for example, Model HTP234PS1, Model 728, and Model 201 manufactured by Piotec Co.,Ltd., and HERCULES PH-4634, HERCULES WIDE PH-5040, GAIA PGA-5040, and ZEUS PZ-130110D manufactured by EUROPORT.Co.Ltd., and the like can be used. Also, an iron may be used as the heating and pressing means.
  • the transfer and fixation temperature is a temperature P T [°C] that satisfies the following relational equation (1).
  • UT fb ⁇ P T ⁇ UT 1 / 2 where in Equation (1), UT fb [°C] represents an outflow starting temperature of the undercoat layer forming toner, and UT 1/2 [°C] represents a 1/2 outflow temperature of the undercoat layer forming toner.
  • the transfer and fixation temperature P T [°C] satisfies the following relational equation (2). UT fb ⁇ P T ⁇ UT fb + UT 1 / 2 2
  • a 1/2 outflow temperature CT 1/2 [°C] of the image forming toner and the 1/2 outflow temperature UT 1/2 [°C] of the undercoat layer forming toner satisfy the following relational equation (3).
  • the outflow starting temperature and the 1/2 outflow temperature are measured as follows: using a flow tester (CFT-500D, manufactured by SHIMADZU CORPORATION), a load of 1.96 MPa is applied to 1.0 g of sample by a plunger while heating at a temperature rising rate of 6°C/min, and extruded from a nozzle having a diameter of 1.0 mm and a length of 1.0 mm to obtain a plot of a plunger descending quantity of the flow tester with respect to the temperature as illustrated in FIG. 1 . In the curve of the plunger descending quantity vs. the temperature illustrated in FIG.
  • the temperature at which the plunger clearly begins to descend again after a slight ascent of the piston due to thermal expansion of a sample is defined as an outflow starting temperature (UT fb ), and a temperature at which half of the sample outflows is defined as a 1/2 outflow temperature (UT 1/2 ).
  • a heating and pressing time for the transfer and fixation is not particularly limited, but preferably the pressure is adjusted to a range of from 100 to 800g/cm 2 , and the time is adjusted to a range of from 5 to 60 seconds depending on a thermal conductivity, a thickness, and a surface roughness of the image receiving substrate.
  • the image forming toner a process color toner for use in electrophotographic image forming apparatuses can be used.
  • a toner including constituent materials equivalent to the process color toner can be used.
  • the toner may have any color, preferably a transparent toner with no pigment or a white toner with white pigment as a pigment is used.
  • use of the white toner is most desirable from the viewpoint of opacifying a color of an image receiving substrate with deep color such as black and dark blue, and preventing impairment of a color of a process color.
  • the 1/2 outflow temperature of the undercoat layer forming toner is higher than the 1/2 outflow temperature of the process color toner.
  • a binder resin used as the toner material
  • a conventionally known resin can be used.
  • the binder resin include, but are not limited to, styrene-based resins (e.g., homopolymers and copolymers including styrene or a styrene-substituted body) such as styrene, poly- ⁇ -methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-butadiene copolymer, styrene-vinyl chloride copolymer, styrene-vinyl acetate copolymer, styrene-maleic acid copolymer, styrene-acrylate copolymer, styrene-methacrylate copolymer, styrene-methyl ⁇
  • the binder resin (resin for fixation) preferably includes a polyester resin.
  • the binder resin includes a polyester resin as a main component.
  • polyester resins are fixable at lower temperatures while maintaining heat-resistant storage stability, compared with other resins. Therefore, polyester resins are suitable for the binder resin of the present disclosure.
  • the polyester resin used in the present disclosure is obtained by polycondensation of an alcohol with a carboxylic acid.
  • Examples of the alcohol for use include, but are not limited to: glycols such as ethylene glycol, diethylene glycol, triethylene glycol, and propylene glycol; etherified bisphenols such as 1,4-bis(hydroxymethyl)cyclohexane and bisphenol A; and divalent alcohol monomers and trivalent or higher polyvalent alcohol monomers.
  • glycols such as ethylene glycol, diethylene glycol, triethylene glycol, and propylene glycol
  • etherified bisphenols such as 1,4-bis(hydroxymethyl)cyclohexane and bisphenol A
  • divalent alcohol monomers and trivalent or higher polyvalent alcohol monomers divalent alcohol monomers and trivalent or higher polyvalent alcohol monomers.
  • carboxylic acid examples include, but are not limited to: divalent organic acid monomers such as maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, and malonic acid; and trivalent or higher polyvalent carboxylic acid monomers such as 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methylenecarboxypropane, and 1,2,7,8-octanetetracarboxylic acid.
  • divalent organic acid monomers such as maleic acid, fumaric acid, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, and malonic acid
  • trivalent or higher polyvalent carboxylic acid monomers such as 1,2,4-
  • the toner according to the present disclosure may include a wax.
  • the type of the wax is not particularly limited and can be suitably selected to suit to a particular application.
  • One type of wax may be used alone, or two or more types of waxes may be used in combination.
  • Examples of a usable release agent include, but are not limited to: aliphatic hydrocarbons such as liquid paraffin, micro-crystalline wax, natural paraffin, synthetic paraffin, and polyolefin wax, and partial oxides, fluorides, and chlorides of these aliphatic hydrocarbons; animal oils such as beef tallow and fish oil; vegetable oils such as coconut oil, soybean oil, rapeseed oil, rice bran wax, and carnauba wax; higher aliphatic alcohols and higher fatty acids such as montan wax; fatty acid amides and fatty acid bisamides; metal soaps such as zinc stearate, calcium stearate, magnesium stearate, aluminum stearate, zinc oleate, zinc palmitate, magnesium palmitate
  • the toner according to the present disclosure may contain a colorant.
  • the colorant is not particularly limited, and commonly used colorants can be appropriately selected and used.
  • colorants for black toner include, but are not limited to, carbon black alone, and a mixture of carbon black as a main component with copper phthalocyanine or the like, with adjusted hue and lightness.
  • colorants for cyan toner include, but are not limited to, copper phthalocyanine that is Pigment Blue 15:3, and a mixture of copper phthalocyanine with aluminum phthalocyanine.
  • colorants for magenta toner include, but are not limited to, Pigment Red 53:1, Pigment Red 81, Pigment Red 122, Pigment Red 269, and combinations of these colorants.
  • colorants for yellow toner include, but are not limited to, Pigment Yellow 74, Pigment Yellow 155, Pigment Yellow 180, Pigment Yellow 185, and combinations of these colorants.
  • Preferred is Pigment Yellow 185 alone or a mixture of Pigment Yellow 185 with Pigment Yellow 74 for chroma and storability.
  • white pigments examples include, but are not limited to, titanium dioxide which is surface-treated with silicon, zirconia, aluminum, or polyol.
  • colorants for green toner include, but are not limited to, Pigment Green 7, which should be used paying attention to safety.
  • colorants for blue toner include, but are not limited to, Pigment Blue 15:1 and Pigment Violet 23.
  • the electrophotographic developing toner according to the present disclosure may contain a charge controlling agent.
  • Examples of the charge controlling agent include, but are not limited to: nigrosine and modified products with fatty acid metal salts; onium salts such as phosphonium salt and lake pigments of these salts; triphenylmethane dyes and lake pigments of these dyes, metal salts of higher fatty acids; diorganotin oxides such as dibutyltin oxide, dioctyltin oxide, and dicyclohexyltin oxide; diorganotin borates such as dibutyltin borate, dioctyltin borate, and dicyclohexyltin borate; as well as organometallic complexes, chelate compounds, monoazo metal complexes, acetylacetone metal complexes, metal complexes based on aromatic hydroxycarboxylic acids or aromatic dicarboxylic acid, and quaternary ammonium salts.
  • Examples of the charge controlling agent further include, but are not limited to, aromatic hydroxycarboxylic acids, aromatic mono- and poly- carboxylic acids and metal salts of aromatic mono- and poly- carboxylic acids, anhydrides, esters, and phenol derivatives such as bisphenol. Each of these charge controlling agents can be used alone or in combination with others.
  • inorganic particles as external additives used in the present disclosure include, but are not limited to, silica, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, zinc oxide, silica sand, clay, mica, wollastonite, diatomaceous earth, chromium oxide, cerium oxide, red iron oxide, antimony trioxide, magnesium oxide, zirconium oxide, barium sulfate, barium carbonate, calcium carbonate, silicon carbide, and silicon nitride. Particularly, silica, alumina, and titanium oxide are preferred.
  • the inorganic particles may be particles with surface treated with a hydrophobizing agent.
  • a hydrophobizing agent include, but are not limited to, silane coupling agents, silylation agents, silane coupling agents having a fluorinated alkyl group, organic titanate coupling agents, and aluminum coupling agents, as surface treating agents.
  • silicone oils are adequately effective as the hydrophobizing agent.
  • the electrophotographic developing toner according to the present disclosure can be used in both electrophotographic image forming methods: a one-component developing system using a toner as a developer; and a two-component developing system using a mixture of the toner with a carrier as a two-component developer.
  • fine particles of a magnetic material can be used as a magnetic carrier.
  • the magnetic materials include, but are not limited to: magnetite; spinel ferrites containing gamma iron oxide; spinel ferrites containing at least one metal (e.g., Mn, Ni, Zn, Mg, and Cu) other than iron; magnetoplumbite-type ferrites such as barium ferrite; and particulate iron or alloy having an oxidized layer on its surface.
  • the magnetic material may be in any of granular, spherical, or needle-like shape.
  • ferromagnetic fine particles made of iron or the like are preferably used.
  • magnetite spinel ferrites containing gamma iron oxide, or magnetoplumbite-type ferrites such as barium ferrite are preferably used.
  • a resin carrier may also be used which has a desirable magnetization by containing an appropriate type of ferromagnetic fine particles in an appropriate amount.
  • such a carrier preferably has a magnetization strength of 30 to 150 emu/g at 1,000 oersted.
  • Such a resin carrier may be produced by spraying a melt-kneaded product of magnetic fine particles with an insulating binder resin by a spray dryer, or dispersing magnetic fine particles in a condensation-type binder resin by reacting/curing a monomer or prepolymer in an aqueous medium in the presence of magnetic fine particles.
  • Chargeability of the magnetic carrier may be controlled by fixedly adhering positively- or negatively-chargeable fine particles or conductive fine particles to the surface of the magnetic carrier, or coating the magnetic carrier with a resin.
  • the surface coating material examples include, but are not limited to, silicone resin, acrylic resin, epoxy resin, and fluorine-based resin. These resins may contain positively- or negatively-chargeable fine particles or conductive fine particles for coating. Among these resins, silicone resin and acrylic resin are preferred.
  • the binder resin, the colorant, the release agent, and optionally charge controlling agent are combined and thoroughly mixed in a mixer such as HENSCHEL MIXER and SUPER MIXER.
  • the mixture is then melt-kneaded by a heat melt kneader such as a heat roll, a kneader, and an extruder, so that the materials are thoroughly mixed.
  • a heat melt kneader such as a heat roll, a kneader, and an extruder.
  • the kneaded mixture is cooled to solidify, then pulverized into fine particles, and the fine particles are classified by size to obtain a toner.
  • the pulverizing process may be of a jet mill process in which a high-speed airflow incorporates toner particles to let the toner particles collide with a collision plate and be pulverized by the collision energy, an inter-particle collision process which lets toner particles collide with each other in an airflow, or a mechanical pulverizing process in which toner particles are supplied to a narrow gap formed with a rotor rotating at a high speed to be pulverized.
  • the toner according to an embodiment of the present invention may also be prepared by a dissolution suspension method.
  • an oil phase is dispersed in an aqueous medium.
  • the oil phase comprises toner materials and an organic solvent dissolved or dispersed in the pol phase.
  • the toner raw materials listed above were preliminarily mixed using a HENSCHEL MIXER (FM20B manufactured by NIPPON COKE & ENGINEERING CO., LTD.) and melt-kneaded using a single-shaft kneader (BUSS CO-KNEADER manufactured by Buss AG) at a temperature of from 100 to 130°C.
  • the kneaded product was cooled to room temperature and coarsely pulverized using a ROTOPLEX to have a diameter of from 200 to 300 ⁇ m.
  • the resulted particles were further finely pulverized using a counter jet mill (100AFG manufactured by Hosokawa Micron Corporation) to have a predetermined number average particle diameter distribution while appropriately adjusting the pulverization air pressure.
  • the resulted particles were classified by size using an air classifier (EJ-LABO manufactured by MATSUBO Corporation) to have a predetermined number average particle diameter distribution while appropriately adjusting an opening of a louver.
  • toner base particles were prepared.
  • 100 parts of toner base particles were stirred and mixed with 3.0 parts of an external additive (hydrophobized silica HDK-2000, manufactured by Clariant AG) using Henschel mixer to prepare [White toner 1].
  • the outflow starting temperatures and the 1/2 outflow temperatures of the toners were evaluated according to the method described in "Method for Measuring Outflow Starting Temperature and 1/2 Outflow Temperature" above.
  • the above mixture was dispersed by a homomixer for 20 minutes to prepare a coating layer forming liquid.
  • Manganese (Mn) ferrite particles having a weight average particle diameter of 35 ⁇ m as core materials were coated with the coating layer forming liquid using a fluidized bed coating device while controlling the temperature inside the fluidized bed to 70°C, followed by drying, so that the coating layer was formed on the surface of the core materials with an average film thickness of 0.20 ⁇ m.
  • the resulting carrier was burnt in an electric furnace at 180°C for 2 hours. Thus, a carrier A was prepared.
  • Each of the prepared white toners and color toners was uniformly mixed with the carrier A by a TURBULA mixer (manufactured by Willy A. Bachofen (WAB) AG) at a revolution of 48 rpm for 5 minutes to be charged.
  • TURBULA mixer manufactured by Willy A. Bachofen (WAB) AG
  • WAB Willy A. Bachofen
  • image colors were visually evaluated in accordance with the following criteria.
  • JIS Japanese Industrial Standard
  • Table 2 Component White toner 1 White toner 2 Color toner 1 Color toner 2 Color toner 3 Polyester resin RN-290 94.7 94.7 94.7 62.6 RN-263 32.1 Wax WA-05 5.3 5.3 5.3 5.3 5.3 Charge controlling agent TN-105 0.5 1.0 0.1 0.5 Pigment White PF-739 60.0 60.0 Cyan FG-7351 10.0 10.0 10.0 External additive HDK2000 3.0 3.0 3.0 3.0 3.0 Evaluation result UT 1/2 (°C) 140.0 150.0 UT fb (°C) 105.0 110.0 CT 1/2 (°C) 130.0 140.0 120.0 CT fb (°C) 102.0 105.0 99.0 Table 2 Example 1 Comparative Example 1 Example 2 Example 3 Comparative Example 2 Example 4 Example 5 Example 6 White toner No.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Color Electrophotography (AREA)

Claims (4)

  1. Procédé de formation d'image comprenant :
    la formation d'une image de toner sur un support de transfert avec un toner de formation d'image à l'aide d'un appareil de formation d'image électrophotographique ;
    la formation d'une couche de revêtement inférieur sur l'image de toner avec un toner de formation de couche de revêtement inférieur;
    le chauffage et le pressage d'un substrat récepteur d'image et de la couche de revêtement inférieur ensemble pour transférer et fixer l'image de toner sur le support de transfert au substrat récepteur d'image, à une température de transfert et de fixation PT satisfaisant à l'équation relationnelle suivante (1) ; et
    la séparation de l'image de toner transférée et fixée au substrat récepteur d'image du support de transfert, UT fb < P T < UT 1 / 2
    où dans l'équation (1), UTfb représente une température de départ de sortie du toner de formation de couche de revêtement inférieur, et UT1/2 représente une 1/2 température de sortie du toner de formation de couche de revêtement inférieur,
    dans lequel la température de départ de sortie du toner de formation de couche de revêtement inférieur UTfb et la 1/2 température de sortie du toner de formation de couche de revêtement inférieur UT1/2 sont mesurées selon le procédé décrit dans la description à l'aide d'un testeur de débit CFT-500D.
  2. Procédé de formation d'image selon la revendication 1, dans lequel la température de départ de sortie UTfb et la 1/2 température de sortie UT1/2 du toner de formation de couche de revêtement inférieur, et la température de transfert et de fixation PT satisfont à l'équation relationnelle suivante (2). UT fb < P T < UT fb + UT 1 / 2 2
  3. Procédé de formation d'image selon la revendication 1 ou 2, dans lequel une 1/2 température de sortie CT1/2 du toner de formation d'image et la 1/2 température de sortie UT1/2 du toner de formation de couche de revêtement inférieur satisfont à l'équation relationnelle suivante (3). C T 1 / 2 < UT 1 / 2
  4. Procédé de formation d'image selon l'une quelconque des revendications 1 à 3, dans lequel le toner de formation de couche de revêtement inférieur est un toner blanc ou un toner transparent.
EP22195271.6A 2021-10-08 2022-09-13 Procédé de formation d'images Active EP4163725B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2021166042A JP7728522B2 (ja) 2021-10-08 2021-10-08 画像形成方法

Publications (2)

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EP4163725A1 EP4163725A1 (fr) 2023-04-12
EP4163725B1 true EP4163725B1 (fr) 2025-12-03

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4589953B2 (ja) 2007-09-27 2010-12-01 株式会社沖データ 画像形成装置
JP2015001628A (ja) 2013-06-14 2015-01-05 富士ゼロックス株式会社 画像形成装置
JP5847277B2 (ja) 2014-11-05 2016-01-20 株式会社沖データ 画像形成方法
JP2020118896A (ja) * 2019-01-25 2020-08-06 株式会社沖データ 画像形成装置及び画像形成方法

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EP4163725A1 (fr) 2023-04-12
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