Method for producing printed matter

Abstract

[Problem] To provide a method for producing a printed matter having a printed layer that can be removed from a base material and is not susceptible to peeling off from the base material. [Solution] A method for manufacturing a printed matter is provided with a base layer forming step, a printed layer forming step, a print quality confirmation step, and a post-treatment step. In the base layer forming step, a base layer that can be removed from the base material is formed on the surface of the base material. In the printing layer forming step, a printing layer is formed on a surface of the base layer opposite to the base material. In the printing quality confirmation step, the quality of the printing layer is confirmed. In the post-treatment step, according to the quality of the printing layer, a cover layer covering the printing layer is formed, or the printing layer is removed from the base material together with the base layer.

Description

Technical Field

[0001] The present invention relates to a method for producing a printed matter. Background Art

[0002] The printed matter has a printed layer showing information such as an image formed on a substrate. For such a printed matter, there is a known method of removing the printed layer from the substrate and reusing the substrate. This allows repeated printing with one substrate, thereby reducing waste of the substrate when, for example, the quality of the printed layer does not meet a predetermined standard and the printed matter is re-manufactured.

[0003] For example, Patent Document 1 discloses a method of dissolving ink constituting a printed layer using a solvent to remove the printed layer from a substrate.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-65213 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] According to the research of the inventors, the printing layer composed of ink that can be removed from the substrate sometimes has a lower adhesion to the substrate. Therefore, for a printed material (such as a final product) whose quality meets a predetermined standard and does not require reprinting (removal of the printing layer), there is a tendency that the printing layer becomes easily peeled off from the substrate.

[0009] Therefore, the present invention is required to provide a method for producing a printed article having a printed layer that can be removed from a substrate and is not easily peeled from the substrate.

[0010] Solutions for solving problems

[0011] A method for producing a printed matter according to one aspect of the present invention comprises:

[0012] A base layer forming step, a printing layer forming step, a printing quality checking step, and a post-processing step. In the base layer forming step, a base layer that can be removed from the base material is formed on the surface of the base material. In the printing layer forming step, a printing layer is formed on the side of the base layer opposite to the base material. In the printing quality checking step, the quality of the printing layer is checked. In the post-processing step, a covering layer covering the printing layer is formed, or the printing layer is removed from the base material together with the base layer, depending on the quality of the printing layer.

[0013] With such a method, it is possible to provide a printed article having a printed layer that can be removed from a substrate and is not easily peeled from the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flowchart of a method for producing a printed matter according to an embodiment.

[0015] Figure 2 The diagram is a plan view (top) and a cross-sectional view (bottom) showing a state where a base layer and a printed layer are formed.

[0016] Figure 3 The top view (top) and cross-sectional view (bottom) show a state where a base layer, a printing layer, and a cover layer are formed.

[0017] Figure 4 This is a flowchart of a method for producing a printed matter according to a modified example. DETAILED DESCRIPTION

[0018] Hereinafter, the method for producing a printed matter according to the present embodiment will be described in detail with reference to the drawings.

[0019] Figure 1 This is a flowchart of a method for producing a printed matter according to an embodiment.

[0020] Figure 2 The top view (top) and cross-sectional view (bottom) show the state where the base layer 2 and the printed layer 3 are formed. (a) shows that the size of the base layer 2 is roughly equal to the size of the printed layer 3. (b) shows that the size of the base layer 2 is slightly larger than the size of the printed layer 3.

[0021] Figure 3 The top view (top) and cross-sectional view (bottom) show the state where the base layer 2, the printed layer 3 and the cover layer 4 are formed. (a) shows that the cover layer 4 is provided in each of the multiple areas to be covered. (b) shows that the cover layer 4 is provided in a manner that covers the multiple areas to be covered at once.

[0022] In the following description, Figure 2 and Figure 3 The upper side in the expression is defined as “upper” or “above”, and the lower side is defined as “lower” or “below”.

[0023] Figure 1 The printed material manufacturing method shown includes a base layer forming step S1, a printing layer forming step S2, a printing quality checking step S3, a covering layer forming judging step S4, and a covering layer forming step S5 and a printing layer / base layer removing step S6 as post-processing steps.

[0024] Hereinafter, each step will be described in sequence.

[0025] <Base layer forming step S1>

[0026] In the base layer forming step S1 , a base layer 2 that is removable from the base material 1 is formed on the upper surface (surface) of the base material (medium) 1 .

[0027] First, a substrate 1 is prepared.

[0028] As the substrate 1, a resin substrate formed of polyester (polyethylene terephthalate, etc.), an olefin-based elastomer, etc. is preferred, but a paper substrate, a ceramic substrate, etc. may also be used.

[0029] The shape of the substrate 1 may be any shape, for example, a sheet shape, a flat plate shape, or any three-dimensional shape.

[0030] It should be noted that the substrate 1 may have a structure having an ink receiving layer near its surface, that is, a structure having a substrate body and an ink receiving layer formed on the surface of the substrate body.

[0031] Next, the base layer 2 is formed on the upper surface of the substrate 1 .

[0032] The base layer 2 is formed by supplying the first ink (base layer forming ink) to the upper surface of the substrate 1. The method for supplying the first ink is not particularly limited, and examples thereof include a droplet ejection method (inkjet method), a rod coating method, a wire bar coating method, a spin coating method, a casting method, a micro gravure coating method, a gravure coating method, a roll coating method, a dip coating method, a spray coating method, a screen printing method, a flexographic printing method, an offset printing method, and the like.

[0033] Among these, as a method for supplying the first ink, a droplet ejection method or a rod coating method is preferred. That is, the base layer 2 is suitably formed by the droplet ejection method or the rod coating method. By using the droplet ejection method, it is easy to accurately form a base layer 2 having a shape corresponding to the shape of the printed layer 3 described later. In addition, by using the droplet ejection method, it is also possible to accurately form a base layer 2 having a fine shape.

[0034] In addition, by the bar coating method, it is easy to form the base layer 2 having a large area with a uniform thickness.

[0035] The base layer 2 is configured to be removable from the substrate 1 , and the removal is preferably performed by at least one selected from the group consisting of contact with a solvent, ultraviolet irradiation, heating, and plasma treatment.

[0036] When the base layer 2 is removed by contact with a solvent, usable solvents include water, weak alkaline aqueous solutions, organic solvents (alcohols, esters, etc.), etc. Therefore, the base layer 2 that can be removed by contact with a solvent may contain a water-soluble compound, for example.

[0037] As the water-soluble compound, for example, water-soluble resins such as polyvinyl alcohol (PVA), butene glycol vinyl alcohol copolymer (BVOH), and polyallylamine (PAA) are preferred. These water-soluble resins may be used alone or in combination of two or more.

[0038] The molecular weight (weight average molecular weight) of the water-soluble resin is not particularly limited, but is preferably 1000 to 7500, more preferably 1250 to 5000, and still more preferably 1500 to 3000. The water-soluble resin having the above molecular weight does not cause a decrease in the strength of the base layer 2 and can maintain sufficiently high water solubility.

[0039] In addition, the weight average molecular weight of a resin is calculated|required as the conversion value of a standard polystyrene standard by the gel permeation chromatography (GPC) method.

[0040] When the base layer 2 is removed by ultraviolet irradiation, the base layer 2 is constituted by, for example, containing an ultraviolet-degradable compound.

[0041] As the ultraviolet decomposable compound, for example, ultraviolet decomposable resins such as polyethylene, polypropylene, polyvinyl chloride, polylactic acid introduced with a small amount of sugar polymer units, acrylic resins, polyester resins, and polyurethane resins are preferred. These ultraviolet decomposable resins can be used alone or in combination of two or more.

[0042] When the base layer 2 is removed by heat, the base layer 2 is constituted by, for example, containing a thermally decomposable compound.

[0043] Preferred examples of the thermally decomposable compound include ethyl cellulose, alkylated, (meth)acrylated or epoxidized polyalkylene glycols (polyethylene glycol, polypropylene glycol, etc.), polymers of (meth)acrylates having an alkyl group with 1 to 6 carbon atoms, poly(meth)acrylic acid, polystyrene, and thermally decomposable resins such as cross-linked polystyrene. These thermally decomposable resins may be used alone or in combination of two or more.

[0044] In addition, the base layer 2 may be composed of, for example, a resin having a glass transition temperature (Tg) of about room temperature and heat-expanding particles. In this case, the base layer 2 is highly softened at a temperature slightly higher than room temperature (25° C.), or the heat-expanding particles are thermally expanded to impart physical stress, thereby enabling the base layer 2 to be peeled off from the substrate 1.

[0045] Examples of the resin having a Tg of about room temperature include polyethylene, polypropylene, polyurethane, polyethyl acrylate, polybutyl acrylate, etc. These resins may be used alone or in combination of two or more.

[0046] As a constituent material of the heat-expandable particles, there can be mentioned, for example, acrylic resins such as acrylonitrile copolymers, amide resins, styrene resins, etc. These materials may be used alone or in combination of two or more.

[0047] The heat-expandable particles may be hollow or solid, preferably hollow. The hollow heat-expandable particles contain gas, so the volume change caused by thermal expansion can be greater.

[0048] Examples of the gas contained in the thermally expandable particles include air, ethane, ethylene, propane, propylene, n-butane, isobutane, butylene, isobutylene, n-pentane, isopentane, neopentane, n-hexane, heptane, low molecular weight hydrocarbons (low boiling hydrocarbons) such as petroleum ether, chlorofluorocarbons such as CCl3F, CCl2F2, and CClF3, and tetraalkylsilanes such as tetramethylsilane, trimethylethylsilane, and trimethylisopropylsilane.

[0049] When the base layer 2 is removed by plasma treatment, the base layer 2 may be constituted by including, for example, a plasma-decomposable compound.

[0050] Preferred examples of the plasma-decomposable compound include polymers of (meth)acrylates having an alkyl group having 1 to 6 carbon atoms, polyvinyl alcohol, polyvinyl acetate, cellulose and its derivatives, and plasma-decomposable resins such as copolymers containing these as main components. These plasma-decomposable resins may be used alone or in combination of two or more.

[0051] As a solvent or a dispersion medium for dissolving or dispersing the above components to prepare the first ink, a hydrophilic solvent is preferred.

[0052] Examples of the hydrophilic solvent include water, alcohols having a carbon number of 3 or less such as methanol, ethanol, 1-propanol, and 2-propanol, glycol ethers such as ethylene glycol monomethyl ether and propylene glycol monoether, amides such as N,N-dimethylformamide and N-methylpyrrolidone, lactones such as γ-butyrolactone, γ-valerolactone, and ε-caprolactone, ketones such as acetone, dimethyl sulfoxide, etc. These solvents may be used alone or in combination of two or more.

[0053] For example, various surfactants may be added to the first ink for the purpose of improving wettability to the upper surface of the substrate 1. As the surfactant, any of cationic, anionic, amphoteric, and nonionic surfactants may be used.

[0054] The cationic surfactant is not particularly limited, and examples thereof include aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts, and imidazolinium salts.

[0055] The anionic surfactant is not particularly limited, and examples thereof include fatty acid soaps, N-acyl-N-methylglycinates, N-acyl-N-methyl-β-alaninates, N-acylglutamates, alkyl ether carboxylates, acylated peptides, alkyl sulfonates, alkylbenzenesulfonates, alkylnaphthalenesulfonates, dialkyl sulfosuccinates, alkyl sulfoacetates, α-olefinsulfonates, N-acylmethyltaurine, sulfated oils, higher alcohol sulfates, higher secondary alcohol sulfates, alkyl ether sulfates, higher secondary alcohol ethoxysulfates, polyoxyethylene alkylphenyl ether sulfates, glycerol aliphatic ester sulfates (monoglysulfates), fatty acid alkanolamide sulfates, alkyl ether phosphates, and alkyl phosphates.

[0056] The amphoteric surfactant is not particularly limited, and examples thereof include carboxybetaine-type, sulfobetaine-type, aminocarboxylate, and imidazolinium betaine.

[0057] The nonionic surfactant is not particularly limited, and examples thereof include polyoxyethylene alkyl ethers, polyoxyethylene secondary alcohol ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene sterol ethers, polyoxyethylene lanolin derivatives, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene glycerol fatty acid esters, polyoxyethylene castor oil, hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyethylene glycol fatty acid esters, fatty acid monoglycerides, polyglycerol fatty acid esters, sorbitan fatty acid esters, propylene glycol fatty acid esters, sucrose fatty acid esters, fatty acid alkanolamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, alkylamine oxides, acetylene glycols, acetylene alcohols, polyether-modified polydimethylsiloxanes, polyester-modified polydimethylsiloxanes, and the like.

[0058] These surfactants may be used alone or in combination of two or more.

[0059] The content of the surfactant in the first ink is not particularly limited, but is preferably 0.001% by mass or more and 5% by mass or less, more preferably 0.01% by mass or more and 1% by mass or less, and further preferably 0.1% by mass or more and 0.5% by mass or less. By adjusting the content of the surfactant within the above range, the surface tension of the first ink can be arbitrarily adjusted, and a range particularly suitable for the droplet ejection method can be adjusted.

[0060] The first ink may contain a photocurable compound. In this case, photocurability (photopolymerization) can be imparted to the first ink.

[0061] When the above-mentioned water-soluble compound is used, a water-soluble photocurable compound can be preferably used among the photocurable compounds.

[0062] Examples of the water-soluble photocurable compound include acrylamide compounds, monofunctional (meth)acrylate compounds, and polyfunctional (meth)acrylate compounds.

[0063] Examples of the acrylamide compound include (meth)acrylamide derivatives having 3 to 15 carbon atoms, hydroxyl-containing (meth)acrylates having 5 to 15 carbon atoms, hydroxyl-containing (meth)acrylates having a number average molecular weight (Mn) of 200 to 1000, and (meth)acryloylmorpholine.

[0064] Examples of the (meth)acrylamide derivative having a carbon number of 3 or more and 15 or less include (meth)acrylamide, N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-propyl(meth)acrylamide, n-butyl(meth)acrylamide, N,N'-dimethyl(meth)acrylamide, N,N'-diethyl(meth)acrylamide, N-hydroxyethyl(meth)acrylamide (HEAA), N-hydroxypropyl(meth)acrylamide, and N-hydroxybutyl(meth)acrylamide.

[0065] Examples of the hydroxyl group-containing (meth)acrylate having 5 to 15 carbon atoms include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate.

[0066] Examples of the hydroxyl-containing (meth)acrylate having a number average molecular weight (Mn) of 200 to 1000 include polyethylene glycol mono(meth)acrylate, monoalkoxy (carbon number of 1 to 4) polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, monoalkoxy (carbon number of 1 to 4) polypropylene glycol mono(meth)acrylate, and mono(meth)acrylate of a polyethylene glycol (PEG)-polypropylene glycol (PPG) block polymer.

[0067] As the monofunctional (meth)acrylate compound, a monofunctional (meth)acrylate compound having high polarity is preferred.

[0068] Specific examples of the monofunctional (meth)acrylate compound include N-vinylpyrrolidone, vinyl group-containing lactams such as N-vinylcaprolactam, acryloylmorpholine, dimethylaminoethyl (meth)acrylate, and N,N-dimethylaminopropyl (meth)acrylamide.

[0069] As the polyfunctional (meth)acrylate compound, a polyfunctional (meth)acrylate compound having an aliphatic polyether structure or an aliphatic polyester structure is preferred.

[0070] Specific examples of the polyfunctional (meth)acrylate compound include tetramethylene glycol diacrylate, hexamethylene glycol diacrylate, polyethylene glycol diacrylate, polytetramethylene glycol diacrylate, polypropylene glycol diacrylate, and polyester diol diacrylate.

[0071] Moreover, as a polyfunctional (meth)acrylate type compound, the urethane (meth)acrylate which has an aliphatic polyether structure or an aliphatic polyester structure can also be used suitably.

[0072] The number average molecular weight (Mn) of the aliphatic polyether structure or aliphatic polyester structure of these polyfunctional (meth)acrylates is preferably 600 or more and 2,000 or less, and more preferably 800 or more and 1,500 or less.

[0073] When a photocurable compound is used, it is preferable to add a photocuring initiator to the first ink.

[0074] The photocuring initiator may be any compound that starts curing (polymerization) of a photocurable compound by irradiation with light, and examples thereof include photopolymerization initiators.

[0075] The photopolymerization initiator may be used alone or in combination of two or more, or in combination with a sensitizer. The selection, combination and blending ratio of the main photopolymerization initiator and sensitizer may be appropriately determined according to the type of photocurable compound used and the type of substrate.

[0076] Examples of the photopolymerization initiator include 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, xanthone, fluorenone, benzaldehyde, fluorene, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4,4'-diaminobenzophenone, Michler's ketone, benzoin propyl ether, benzoin ethyl ether, benzyl dimethyl ketal, 1-(4-isopropylphenyl)-2-hydroxy-2-methyl-1- Acetone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, thioxanthone, diethylthioxanthone, 2-isopropylthioxanthone, 2-chlorothioxanthone, 2-methyl-1-〔4-(methylthio)phenyl〕-2-morpholinyl-1-propanone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis-(2,6-dimethoxybenzoyl)-(2,4,4-trimethylpentyl)phosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, etc.

[0077] Examples of the sensitizer include amines (aliphatic amines, amines containing aromatic groups, piperidine, etc.), ureas (allyl amines, o-tolylthiourea, etc.), sulfur compounds (sodium diethyldithiophosphate, soluble salts of aromatic sulfinic acids, etc.), nitrile compounds (N,N-disubstituted p-aminobenzonitrile, etc.), phosphorus compounds (tri-n-butylphosphine, sodium diethyldithiophosphate, etc.), nitrogen compounds (Michler's ketone, N-nitrosohydroxyamine derivatives, oxazolidine compounds, tetrahydro-1,3-oxazine compounds, condensates of formaldehyde or acetaldehyde and diamines, etc.), chlorine compounds (carbon tetrachloride, hexachloroethane, etc.), polymerized amines which are reaction products of epoxy resins and amines, triethanolamine triacrylate, etc.

[0078] Furthermore, an antiseptic, an antifungal agent, a pH adjuster, a viscosity adjuster, a dispersant, etc. may be added to the first ink as necessary.

[0079] By adding an antiseptic or an antifungal agent, the long-term storage stability of the first ink can be maintained. Examples of the antiseptic or antifungal agent include aromatic halogen compounds, methylene dithiocyanate, halogen-containing nitrogen-sulfur compounds, and 1,2-benzisothiazolin-3-one.

[0080] The coating (liquid coating) of the first ink supplied to the upper surface of the substrate 1 is dried, thereby solidifying the solid components contained in the first ink to obtain a dry coating. The drying may be performed by natural drying, reduced pressure drying, blow drying, heating drying, etc. In addition, two or more drying methods may be combined for drying.

[0081] This dry coating may be used as a base layer as it is, or may be subjected to heat treatment when using the first ink which is not easily affected by heat.

[0082] The heat treatment temperature is not particularly limited, but is preferably about 40° C. or higher and 120° C. or lower, and more preferably about 60° C. or higher and 100° C. or lower.

[0083] The heat treatment time is not particularly limited, but is preferably about 1 minute to about 30 minutes, and more preferably about 5 minutes to about 20 minutes.

[0084] When the first ink contains a photocurable compound, the liquid coating or the dry coating may be irradiated with ultraviolet rays (active energy rays).

[0085] As the lamp that generates ultraviolet rays, for example, a UV-LED (ultraviolet light emitting diode), a metal halide lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a fluorescent tube, etc. can be used.

[0086] The ultraviolet rays to be irradiated are preferably ultraviolet rays having a wavelength of about 300 nm to 400 nm, and more preferably ultraviolet rays that cut off a predetermined wavelength as necessary.

[0087] The temperature during ultraviolet irradiation is preferably about 15° C. to 100° C., more preferably about 20° C. to 50° C. Since UV curing is an exothermic reaction, the higher the temperature, the more the reaction is accelerated, and the temperature can be adjusted according to the type of monomer contained in the first ink.

[0088] The intensity of the irradiated ultraviolet light is preferably 0.1 mW / cm 2 Above and 100W / cm 2 Below about, more preferably 2mW / cm 2 Above and 50W / cm 2 It should be noted that the ultraviolet rays may be irradiated while changing the intensity. In addition, the ultraviolet rays may be irradiated continuously or intermittently (pulsedly).

[0089] The energy of the irradiated ultraviolet light can be adjusted appropriately, and is preferably 10 mJ / cm 2 Above and 500J / cm 2 Below about, more preferably 100mJ / cm 2 Above and 200J / cm 2 Below left and right.

[0090] The thickness of the liquid coating forming the base layer 2 is not particularly limited, but is preferably about 0.05 μm to about 20 μm, and more preferably about 0.1 μm to about 25 μm. If the base layer 2 has such a thickness, sufficient strength can be maintained, and an excellent removal effect (decomposition effect or peeling effect) can be exerted when necessary to be removed from the substrate 1.

[0091] It should be noted that, when using the first ink containing polyallylamine (PAA) as a water-soluble compound, the second ink (printing layer forming ink) described later can be supplied to the liquid coating formed by the first ink supplied to the surface of the substrate (the surface opposite to the substrate 1). That is, the printing layer 3 can be formed by so-called wet on wet.

[0092] The first ink used can be appropriately selected based on the constituent material, surface state, surface treatment, chemical treatment, etc. of the substrate 1 in consideration of wettability to the upper surface of the substrate 1 and adhesion of the formed base layer 2 to the substrate 1.

[0093] The viscosity of the first ink at room temperature (25° C.) is preferably about 20 mPa·s or less, and more preferably about 3 mPa·s or more and 15 mPa·s or less. In this case, a uniform base layer 2 having a uniform thickness can be easily formed.

[0094] The base layer 2 may be a single layer formed by only one first ink, or a laminate having a plurality of layers formed by two or more first inks. In the latter case, as the base layer 2, a first base layer may be formed on the side of the substrate 1, and a second base layer may be formed on the side of the first base layer opposite to the substrate 1, wherein the second base layer has a higher adhesion to the printed layer 2 than the first base layer has to the printed layer 2. Thus, the printed layer 3 can be stably maintained on the base layer (second base layer) 2. In addition, in this case, the first base layer preferably has a higher adhesion to the substrate 1 than the second base layer has to the substrate 1. Thus, the base layer 2 can be stably maintained on the substrate 1.

[0095] In addition, an intermediate layer may be provided between the first base layer and the second base layer, for example, for the purpose of improving the adhesion between them.

[0096] In this embodiment, if Figure 2 As shown in (a) and (b) of FIG. 1 , a circular central base layer 2a and a plurality of peripheral base layers 2b arranged along the periphery of the central base layer 2a are formed as the base layer 2 .

[0097] The size of the base layer 2 (central base layer 2a and peripheral base layer 2b) may be substantially equal to the size of the printed layer 3 to be formed next (see Figure 2 (a)), or slightly larger (see Figure 2 (b)).

[0098] With the above-described configuration, the area of ​​the substrate 1 exposed from the base layer 2 and the printed layer 3 can be sufficiently ensured. Therefore, when the base layer 2 is removed by contact with a solvent, a sufficient contact area between the base layer 2 and the solvent can be ensured, and the base layer 2 can be quickly removed. In addition, as described later, when the cover layer 4 is formed, a sufficient contact area between the base layer 1 and the cover layer 4 can be ensured, and the peeling of the cover layer 4 from the base layer 1 can be easily prevented.

[0099] <Printing layer forming step S2>

[0100] In the printed layer forming step S2 , the printed layer 3 is formed on the upper surface of the base layer 2 (the surface on the opposite side to the substrate 1 ).

[0101] The printed layer 3 is formed by supplying the second ink (printed layer forming ink) to the upper surface of the base layer 2. The method for supplying the second ink is not particularly limited, and examples thereof include a droplet ejection method (inkjet method), a rod coating method, a wire bar coating method, a spin coating method, a casting method, a micro gravure coating method, a gravure coating method, a roll coating method, a dip coating method, a spray coating method, a screen printing method, a flexographic printing method, an offset printing method, and the like.

[0102] Among these, the droplet ejection method is preferred as a method for supplying the second ink. That is, the print layer 3 is preferably formed by the droplet ejection method. By the droplet ejection method, it is easy to accurately form the print layer 3 having a shape corresponding to the shape of the base layer 2. In addition, by the droplet ejection method, it is also possible to accurately form the print layer 3 having a fine shape.

[0103] Examples of the second ink that can be used to form the printed layer 3 include photocurable inks, water-based inks, and solvent inks.

[0104] <<Light-curing ink>>

[0105] The photocurable ink preferably contains at least a photocurable compound and a colorant.

[0106] Examples of the photocurable compound include unsaturated carboxylic acids (acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid) or esters thereof, styrene, styrene derivatives (vinyl toluene, dimethylstyrene, etc.), N-vinyl compounds (N-vinyl pyrrolidone, N-vinyl caprolactam, N-vinyl formamide, N-vinyl acetamide, etc.), N-substituted maleimide, acrylonitrile, acryloyl morpholine, polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, oligomeric acrylate, alkyd acrylate, polyol acrylate, polyester methacrylate, polyurethane methacrylate, epoxy methacrylate, polyether methacrylate, oligomeric methacrylate, alkyd methacrylate, polyol methacrylate, etc.

[0107] Among these, the photocurable compound preferably includes at least one of acrylates and N-vinyl compounds. These photocurable compounds are excellent in photopolymerization and are therefore preferred. In addition, a printed layer 3 having high adhesion to the base layer 2 can also be formed.

[0108] Examples of the acrylates include hexyl (meth)acrylate, 2-(2-methoxyethoxy)ethyl (meth)acrylate, glycidyl (meth)acrylate, glycidyloxybutyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, and monofunctional (meth)acrylates such as EO-modified phenol (meth)acrylate; and polyfunctional (meth)acrylates such as 1,6-hexanediol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, EO-modified bisphenol A di(meth)acrylate, bisphenol F polyethoxy di(meth)acrylate, trimethylolpropane tri(meth)acrylate, sorbitol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate and dipentaerythritol hexa(meth)acrylate.

[0109] The colorant can be selected from pigments and dyes, and from the viewpoint of improving light resistance, it is preferable to use a pigment. As the pigment, either an inorganic pigment or an organic pigment can be used.

[0110] Examples of the inorganic pigment include carbon blacks such as furnace black, lamp black, acetylene black, and channel black, iron oxides, and titanium oxides.

[0111] Examples of the organic pigment include azo pigments such as insoluble azo pigments, condensed azo pigments, azo lakes, and chelated azo pigments; phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxane pigments, thioindigo pigments, isoindolinone pigments, polycyclic pigments such as quinophthalone pigments; nitro pigments; and nitroso pigments.

[0112] The above-mentioned pigments may be used alone or in combination of two or more.

[0113] The content of the colorant in the photocurable ink (also in the other second ink) is not particularly limited, but is preferably about 0.1 mass % to about 10 mass %, and more preferably about 0.5 mass % to about 5 mass %.

[0114] In addition, when the photocurable ink (the same applies to other second inks) is a droplet ejection ink, the average particle size of the colorant is preferably about 10 nm or more and about 500 nm or less, more preferably about 25 nm or more and about 200 nm or less, and further preferably about 50 nm or more and about 100 nm or less. In this case, the ejection stability and dispersion stability of the second ink can be improved, and a high-quality printed layer (image) 3 can also be formed. Here, the average particle size refers to the particle size (D50) at the volume cumulative value of 50% in the particle size distribution obtained by the laser diffraction / scattering method.

[0115] In addition, the photocurable ink may contain a photopolymerization accelerator, a photopolymerization inhibitor, etc. in addition to the same solvent, photopolymerization initiator, surfactant, preservative, mildewproofing agent, pH adjuster, viscosity adjuster, and dispersant as described in the first ink.

[0116] <<Water Ink>>

[0117] The water-based ink preferably contains at least a water-soluble compound, a colorant, and a solvent.

[0118] The water-soluble compound may be the same as that described in the first ink. In the case of a water-based ink, the content of the water-soluble compound in the water-based ink is preferably 1% by mass or more and 20% by mass or less, more preferably 5% by mass or more and 10% by mass or less.

[0119] In addition, the colorant can be the same as the colorant described in the above-mentioned photocurable ink.

[0120] Furthermore, the same compounds (solvents or dispersion media) as those described in the first ink can be used as the solvent. Among these, it is preferable to use water in combination with at least one of alcohols and glycol ethers as the solvent.

[0121] Alternatively, the pH of the aqueous ink may be adjusted by adding an alkali to the aqueous ink.

[0122] As the base, both an inorganic base and an organic base can be used.

[0123] Examples of the inorganic base include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, and the like.

[0124] Examples of the organic base include ammonia, ethylamine, n-propylamine, diethylamine, diethylaminoethanol, di-n-propylamine, triethylamine, N-methyldiethylamine, dimethylethanolamine, triethanolamine, tetramethylammonium hydroxide, and tetraethylammonium hydroxide.

[0125] The content of the alkali in the water-based ink is preferably about 0.05% by mass or more and about 1% by mass or less, and more preferably about 0.1% by mass or more and about 0.5% by mass or less.

[0126] The water-based ink may further contain the same surfactant, preservative, mildewproofing agent, viscosity modifier, dispersant, etc. as those described in the first ink.

[0127] <<Solvent ink>>

[0128] The solvent ink preferably contains at least a resin, a colorant, and a solvent.

[0129] Examples of the resin include vinyl resins (vinyl acetate resins, vinyl chloride resins, etc.), polyurethane resins, ester resins, acrylic resins, styrene resins, butadiene resins, styrene-butadiene resins, acrylic styrene resins, acrylic silicone resins, and the like.

[0130] Among these, vinyl resins are preferred. By using a solvent ink containing a vinyl resin, the adhesion between the formed printed layer 3 and the base layer 2 can be sufficiently improved while maintaining the high wettability of the second ink to the base layer 2.

[0131] The content of the resin in the solvent ink is preferably about 0.1 mass % or more, more preferably about 0.5 mass % or more and about 10 mass % or less, and further preferably about 1 mass % or more and about 5 mass % or less. By making the content of the resin in the solvent ink within the above range, a printed layer 3 with a better appearance can be formed.

[0132] The colorant that can be used is the same as the colorant described in the above-mentioned photocurable ink.

[0133] The solvent may be the same compound (solvent or dispersion medium) as described above for the first ink. Among these, it is preferred that at least one of glycol ethers and lactones be used as the solvent.

[0134] The solvent ink may further contain the same surfactant, preservative, mildewproofing agent, pH adjuster, viscosity adjuster, dispersant, etc. as described in the first ink.

[0135] The coating (liquid coating) of the second ink supplied to the upper surface of the base layer 2 is dried, whereby the solid components contained in the second ink are solidified to obtain a dry coating. The drying may be performed by natural drying, reduced pressure drying, air drying, heating drying, etc. In addition, two or more drying methods may be combined for drying. Furthermore, the same method as the method for drying the coating of the first ink may be used.

[0136] The dried film is subjected to heat treatment to obtain the printed layer 3 .

[0137] The heat treatment temperature is not particularly limited, but is preferably about 40° C. or higher and 120° C. or lower, and more preferably about 60° C. or higher and 100° C. or lower.

[0138] The heat treatment time is not particularly limited, but is preferably about 5 minutes to about 24 hours, and more preferably about 10 minutes to about 20 hours.

[0139] Furthermore, when the second ink is a photocurable ink, the liquid coating or the dry coating may be irradiated with ultraviolet rays (active energy rays).

[0140] In addition, the conditions of ultraviolet irradiation can be set similarly to the conditions of ultraviolet irradiation when forming the base layer 2.

[0141] The thickness of the liquid coating forming the printed layer 3 is not particularly limited, but is preferably about 1 μm to about 50 μm, and more preferably about 10 μm to about 25 μm. The printed layer 3 having such a thickness can maintain sufficient strength.

[0142] The second ink used can be appropriately selected based on the constituent material and surface state of the base layer 2 (first ink) in consideration of wettability to the upper surface of the base layer 2 and adhesion of the formed printed layer 3 to the base layer 2 .

[0143] The viscosity of the second ink at room temperature (25° C.) is preferably about 20 mPa·s or less, and more preferably about 3 mPa·s or more and 15 mPa·s or less. In this case, a uniform printed layer 3 having a uniform thickness can be easily formed.

[0144] When the substrate 1 is viewed from the normal direction of the upper surface (surface), the printed layer 3 is preferably formed in the region of the base layer 2, that is, the base layer 2 has a size including the printed layer 3 (refer to Figure 2 (a) and (b)). Thus, the printed layer 3 can be more stably maintained on the substrate 1 via the base layer 2.

[0145] exist Figure 2 In (b), the central printed layer 3a is formed inside the region of the central base layer 2a, and the peripheral printed layer 3b is formed inside the region of each peripheral base layer 2b. That is, the outer edge of the central base layer 2a is exposed from the central printed layer 3a, and the outer edge of each peripheral base layer 2b is exposed from the peripheral printed layer 3b.

[0146] <Printing quality confirmation process S3>

[0147] In the printing quality confirmation step S3 , the quality of the printed layer 3 is confirmed.

[0148] The quality of the printed layer 3 is appropriately set depending on the target printing quality and is not particularly limited, but is preferably at least one selected from the group consisting of cracks, bleeding, white turbidity, and stickiness.

[0149] As a benchmark for confirming the quality of the printed layer 3, for example, visual observation, palpation observation, image analysis using an imaging element (CCD camera, etc.), surface roughness measurement test, belt peeling test, friction wear test, scratch hardness test, pencil hardness test, etc. can be cited. Only one of these methods may be used, or two or more of them may be used in combination.

[0150] <Coating layer formation determination step S4>

[0151] In the covering layer formation determination step S4, it is determined whether to form the covering layer 4 ( Figure 1 ), or whether to remove the printed layer 3 together with the base layer 2 from the substrate 1 ( Figure 1 in the text field).

[0152] Specifically, in the cover layer formation determination step S4 , if the quality of the printed layer 3 satisfies the above-mentioned criteria, it is determined that the cover layer 4 is to be formed (YES), and the process proceeds to the cover layer formation step S5 .

[0153] On the other hand, in the cover layer formation determination step S4, if the quality of the printed layer 3 does not meet the above criteria, it is determined that the cover layer 4 is not formed (NO) and the process proceeds to the printed layer / underlayer removal step S6.

[0154] <Coating Layer Forming Step S5>

[0155] In the cover layer forming step S5 , the cover layer 4 covering the printed layer 3 is formed.

[0156] The covering layer 4 is formed by supplying the third ink (ink for forming the covering layer) so as to cover the printed layer 3. The method for supplying the third ink is not particularly limited, and examples thereof include a droplet ejection method (inkjet method), a rod coating method, a wire bar coating method, a spin coating method, a casting method, a micro-gravure coating method, a gravure coating method, a roll coating method, a dip coating method, a spray coating method, a screen printing method, a flexographic printing method, an offset printing method, and the like.

[0157] Among these, as a method for supplying the third ink, a droplet ejection method is preferred. That is, the covering layer 4 is suitably formed by the droplet ejection method. By using the droplet ejection method, it is easy to accurately form the covering layer 4 having a shape corresponding to the shapes of the base layer 2 and the printing layer 3. In addition, by using the droplet ejection method, it is also possible to accurately form the covering layer 4 having a fine shape.

[0158] The third ink preferably contains at least a monofunctional (meth)acrylate, a polyfunctional (meth)acrylate, and a photopolymerization initiator.

[0159] As the monofunctional (meth)acrylate and the polyfunctional (meth)acrylate, the same compounds as those described in the first ink or the second ink can be used.

[0160] In addition, as the photopolymerization initiator, the same compound as described in the first ink can be used.

[0161] The third ink may further contain a photopolymerization accelerator, a photopolymerization inhibitor, and the like in addition to the same solvent, surfactant, preservative, antifungal agent, pH adjuster, viscosity adjuster, and dispersant as those described for the first ink.

[0162] When the third ink is used, the cover layer 4 having high adhesion to the substrate 1 can be formed.

[0163] The content of the monofunctional (meth)acrylate in the third ink is preferably about 30% by mass or more and about 80% by mass or less, more preferably about 40% by mass or more and about 70% by mass or less, and still more preferably about 50% by mass or more and about 60% by mass or less.

[0164] The content of the polyfunctional (meth)acrylate in the third ink is preferably about 10% by mass to about 55% by mass, more preferably about 20% by mass to about 45% by mass, and still more preferably about 30% by mass to about 35% by mass.

[0165] The content of the photopolymerization initiator in the third ink is preferably about 1 mass % to about 35 mass %, more preferably about 5 mass % to about 25 mass %, and further preferably about 10 mass % to about 15 mass %.

[0166] The coating film (liquid coating film) of the third ink supplied so as to cover the printed layer 3 is dried as necessary, whereby the solid components contained in the third ink are solidified to obtain a dry coating film.

[0167] In the drying, natural drying, reduced pressure drying, blowing drying, heating drying and the like can be used. In addition, these drying methods can be combined arbitrarily. Furthermore, the same method as the method of drying the coating of the first ink or the second ink can also be used.

[0168] Next, the dry film may be irradiated with ultraviolet rays (active energy rays). The ultraviolet rays may be directly irradiated with the liquid film.

[0169] In addition, the conditions of ultraviolet irradiation can be set similarly to the conditions of ultraviolet irradiation when forming the base layer 2.

[0170] The thickness of the liquid coating forming the covering layer 4 is not particularly limited, but is preferably about 10 μm to about 60 μm, and more preferably about 20 μm to about 40 μm. The covering layer 4 having such a thickness can maintain sufficient strength.

[0171] The third ink used can be appropriately selected based on the constituent materials and surface conditions of the substrate 1 and the printed layer 3 (second ink), taking into consideration the wettability to the upper surface of the printed layer 3, the adhesion of the formed covering layer 4 to the substrate 1 and the printed layer 3, etc.

[0172] The viscosity of the third ink at room temperature (25° C.) is preferably about 20 mPa·s or less, and more preferably about 3 mPa·s or more and 15 mPa·s or less. In this case, a uniform cover layer 4 having a uniform thickness can be easily formed.

[0173] When the substrate 1 is viewed from the normal direction of the upper surface (surface), the cover layer 4 preferably has a size including the printed layer 3 (see Figure 3 (a) and (b)). Thus, the base layer 2 and the printed layer 3 can be more stably maintained on the substrate 1.

[0174] The covering layer 4 may be Figure 3 As shown in (a), the central covering layer 4a covering the central base layer 2a and the central printed layer 3a and the peripheral covering layer 4a covering the peripheral base layer 2b and the peripheral printed layer 3b are composed of independent covering layers. Figure 3 As shown in (b), it is composed of a concentrated covering layer that covers the central base layer 2a, the central printed layer 3a, the peripheral base layer 2b and the peripheral printed layer 3b together.

[0175] In this case, it is particularly preferred that the cover layer 4 has a higher adhesion to the substrate 1 than the base layer 2 by selecting its constituent material. This can further improve the holding power of the base layer 2 and the printed layer 3 to the substrate 1.

[0176] As described above, by sequentially forming the base layer 2 , the printed layer 3 , and the cover layer 4 on the substrate 1 , a printed article as a final product is obtained.

[0177] <Printing layer / base layer removal step S6>

[0178] In the printing layer / base layer removing step S6 , the printing layer 3 is removed from the substrate 1 together with the base layer 2 .

[0179] As described above, the removal of the base layer 2 is preferably performed by at least one selected from the group consisting of contact with a solvent, ultraviolet irradiation, heating, and plasma treatment.

[0180] <<Contact with solvents>>

[0181] The contact between the base layer 2 and the solvent can be carried out, for example, by a method of immersing the base layer 2 (or the substrate 1 having the base layer 2 and the printed layer 3 formed thereon) in the solvent (immersion method), a method of coating the base layer 2 with the solvent (coating method), a method of spraying the solvent onto the base layer 2 (spraying method), etc. Among these, the contact between the base layer 2 and the solvent is preferably carried out by the immersion method.

[0182] The temperature of the solvent is not particularly limited, but is preferably 20° C. to 70° C., more preferably 30° C. to 60° C., and further preferably 40° C. to 50° C. When a solvent at such a temperature is used, the base layer 2 can be removed in a shorter time.

[0183] When the base layer 2 (or the substrate 1 having the base layer 2 and the printed layer 3 formed thereon) is immersed in a solvent, it is preferred to perform at least one selected from ultrasonic irradiation, heating, and shaking. This can promote the dissolution of the base layer 2 in the solvent and its removal.

[0184] When irradiating with ultrasonic waves, the frequency of the ultrasonic waves is preferably about 10 kHz to about 100 kHz, more preferably about 15 kHz to about 80 kHz, and even more preferably about 30 kHz to about 60 kHz.

[0185] The ultrasonic irradiation time is preferably about 1 minute to about 60 minutes, more preferably about 5 minutes to about 45 minutes.

[0186] When heating is performed, the temperature of the solvent (underlayer 2) is preferably about 30°C or higher and 85°C or lower, and more preferably about 40°C or higher and 65°C or lower.

[0187] The shaking can be performed by reciprocating the substrate 1 relative to the solvent.

[0188] <<Ultraviolet radiation>>

[0189] The conditions for ultraviolet irradiation are appropriately set depending on the type of ultraviolet-degradable compound and the like, and therefore are not particularly limited.

[0190] As an example of the conditions for ultraviolet irradiation, the intensity of ultraviolet rays is preferably 10 mW / cm 2 Above and 3000mW / cm 2 Below about, more preferably 20mW / cm 2 Above and 500mW / cm 2 Below left and right.

[0191] In addition, the energy of ultraviolet rays is preferably 100 mJ / cm 2 Above and 20000mJ / cm 2Below about, more preferably 200mJ / cm 2 Above and 10000mJ / cm 2 Below left and right.

[0192] <<Heating>>

[0193] The heating conditions are also appropriately set depending on the type of the thermally decomposable compound, the type of the resin having a Tg around room temperature, the type of the gas contained in the thermally expandable particles, and the like, and therefore are not particularly limited.

[0194] As an example of heating conditions, the heating temperature is preferably about 110° C. or higher and 170° C. or lower, and more preferably about 125° C. or higher and 150° C. or lower.

[0195] The heating time is preferably about 5 minutes to about 100 minutes, more preferably about 10 minutes to about 60 minutes.

[0196] <<Plasma Treatment>>

[0197] The conditions for the plasma treatment are also appropriately set depending on the type of the plasma-degradable compound and the like, and therefore are not particularly limited.

[0198] The processing gas that can be used to generate plasma is not particularly limited, and examples thereof include a gas containing at least one of oxygen, nitrogen, argon, helium, and carbon fluoride as a main component. In particular, when a processing gas containing argon or helium as a main component is used, plasma can be generated in an atmosphere with a relatively low vacuum degree or under atmospheric pressure, thereby simplifying the device.

[0199] The flow rate of the processing gas is preferably about 10 sccm to about 500 sccm, and more preferably about 50 sccm to about 400 sccm.

[0200] The high frequency output (RF power) is preferably 0.005 W / cm 2 Above and 0.2W / cm 2 Below about, more preferably 0.05W / cm 2 Above and 0.1W / cm 2 Below left and right.

[0201] The time of the plasma treatment (treatment time) is preferably about 60 seconds to about 600 seconds, more preferably about 180 seconds to about 360 seconds.

[0202] The temperature of the atmosphere in the plasma treatment (atmospheric temperature) is preferably about 0°C or higher and about 100°C or lower, and more preferably about 20°C or higher and about 50°C or lower.

[0203] The atmosphere of the plasma treatment is preferably an atmosphere with a relatively low degree of vacuum or atmospheric pressure.

[0204] In this way, in the printed layer / base layer removing step S6 , the printed layer 3 is removed from the substrate 1 together with the base layer 2 .

[0205] Then, the substrate 1 after the printing layer 3 and the base layer 2 are removed is transferred to the base layer forming step S1 again, and is provided to the printing layer forming step S2, the printing quality confirmation step S3 and the covering layer forming step S5 or the printing layer / base layer removal step S6 as a post-processing step.

[0206] By using the method for manufacturing printed matter described above, even if the quality of the printed layer 3 does not meet the prescribed standard, the printed layer 3 can be removed together with the base layer 2, and the printed layer 3 can be formed again using the same substrate 1, so that the substrate 1 can be effectively utilized without wasting the substrate 1. In particular, when manufacturing printed matter of substrates 1 and 1 products composed of expensive raw materials, the advantage is great. In addition, for printed matter whose quality of the printed layer 3 meets the prescribed standard, by providing the covering layer 4, it is also possible to prevent the peeling of the printed layer 3 and suppress the reduction of the quality of the printed layer 3.

[0207] When the quality of the printed layer and the performance of the cover layer 4 decrease due to long-term use of the printed article as the final product, the final product may need to be removed from the substrate 1 for disposal. That is, after the cover layer 4 covering the printed layer 3 is formed, the printed layer 3 may need to be removed. In this case, it is preferable to form a through portion that penetrates the cover layer 4 in the thickness direction. After the through portion is formed, for example, a solvent that can dissolve the base layer 2 is allowed to penetrate through the through portion, thereby enabling the base layer 2, the printed layer 3, and the cover layer 4 to be removed from the base layer 1. In this way, the base layer 1 can be reused.

[0208] Even when the base layer 2 is removed by a method other than contact with a solvent, the strength of the cover layer 4 can be reduced by forming the through-portions, making it easier to remove the base layer 2 , the printed layer 3 , and the cover layer 4 from the substrate 1 .

[0209] Examples of the through-portion include a continuously formed slit, an intermittently formed slit (perforation), a through hole (a pinhole, a punched hole, etc.), and the like.

[0210] (Variation Example)

[0211] A modification of the above-described method of producing a printed matter will be described.

[0212] Hereinafter, a method for producing a printed matter according to a modified example will be described, but the description will be mainly focused on the differences from the method for producing a printed matter according to the above-described embodiment, and descriptions of the same matters will be omitted.

[0213] Figure 4 This is a flowchart of a method for producing a printed matter according to a modified example.

[0214] like Figure 4 As shown, the method for producing printed matter of the modified example further includes a temporary covering layer formation determination step S7 and a temporary covering layer formation step S8 between the printing layer forming step S2 and the printing quality confirmation step S3, and other steps are the same as those of the method for producing printed matter of the aforementioned embodiment.

[0215] Hereinafter, the temporary covering layer formation determination step S7 and the temporary covering layer formation step S8 will be described.

[0216] <Temporary Covering Layer Formation Determination Step S7>

[0217] In the temporary covering layer formation determination step S7 , it is determined whether a temporary covering layer covering the printed layer 3 is formed.

[0218] Specifically, whether to form the temporary covering layer is determined based on, for example, the degree of adhesion (affinity) between the printed layer 3 and the base layer 2 , the degree to which the printed layer 3 is susceptible to degradation (oxidation, etc.), and the like.

[0219] When it is determined that a temporary covering layer needs to be formed, ( Figure 4 In the case where the temporary covering layer is determined to be "YES", the temporary covering layer forming step S8 is transferred to the temporary covering layer forming step S8. If it is determined that the temporary covering layer does not need to be formed, ( Figure 4 "NO" in the print quality confirmation step S3.

[0220] <Temporary Covering Layer Forming Step S8>

[0221] In the temporary covering layer forming step S8 , a temporary covering layer covering the printed layer 3 is formed.

[0222] This temporary covering layer has, for example, the following functions.

[0223] I: Function of maintaining the shape of the printed layer 3 until the cover layer 4 is formed

[0224] II: Function of preventing the printed layer 3 from peeling off from the substrate 1 until the cover layer 4 is formed

[0225] III: Function of preventing the quality of the printed layer 3 from being degraded until the cover layer 4 is formed

[0226] IV: Function of assisting in the removal of the printed layer 3 etc. from the substrate 1 when the substrate 1 is reused after the printed article is used as a final product

[0227] V: Function of checking the degree of completion and appearance when forming the cover layer 4

[0228] The temporary covering layer is formed by supplying the fourth ink (temporary covering layer forming ink) so as to cover the printed layer 2. The method for supplying the fourth ink is not particularly limited, and examples thereof include a droplet ejection method (inkjet method), a rod coating method, a wire bar coating method, a spin coating method, a casting method, a micro gravure coating method, a gravure coating method, a roll coating method, a dip coating method, a spray coating method, a screen printing method, a flexographic printing method, an offset printing method, and the like.

[0229] Among these, as a method for supplying the fourth ink, a droplet ejection method is preferred. That is, the temporary covering layer is suitably formed by the droplet ejection method. By using the droplet ejection method, it is easy to accurately form a temporary covering layer having a shape corresponding to the shape of the printed layer 3. In addition, by using the droplet ejection method, a temporary covering layer having a fine shape can also be accurately formed.

[0230] The fourth ink may be at least one selected from the first ink that can be used to form the base layer 2 , the third ink that can be used to form the cover layer 4 , and the like.

[0231] The formation conditions of the temporary covering layer can be set similarly to the formation conditions described for the base layer 2 and the formation conditions described for the covering layer 4, for example.

[0232] The same functions and effects as those of the method for producing printed matter in the above-mentioned embodiment can be obtained by using the method for producing printed matter in such a modified example. In particular, a temporary covering layer covering the printed layer 3 is formed as needed, so that, for example, cracks, bleeding, turbidity, and stickiness of the printed layer 3 are less likely to occur, and the man-hours for re-forming the printed layer 3 (covering layer forming step S4: NO) can be reduced.

[0233] Therefore, regardless of the constituent material of the printed layer 3 , a printed material having the printed layer 3 with little fluctuation in quality can be manufactured.

[0234] The method for producing a printed matter according to the present embodiment and the modified example has the following configuration.

[0235] (1) A method for producing a printed matter, comprising:

[0236] Base layer forming step, printing layer forming step, printing quality confirmation step and post-processing step.

[0237] In the base layer forming step, a base layer that can be removed from the base material is formed on the surface of the base material.

[0238] In the printed layer forming step, the printed layer is formed on the surface of the base layer opposite to the substrate.

[0239] In the printing quality confirmation step, the quality of the printing layer is confirmed.

[0240] In the post-processing step, depending on the quality of the printed layer, a cover layer is formed to cover the printed layer, or the printed layer is removed from the substrate together with the base layer.

[0241] (2) A method for manufacturing a printed matter according to the above (1), wherein, as the aforementioned base layer, there are formed: a first base layer on the aforementioned substrate side, and a second base layer formed on the side of the aforementioned first base layer opposite to the aforementioned substrate, and the adhesion of the second base layer to the aforementioned printed layer is higher than the adhesion of the aforementioned first base layer to the aforementioned printed layer.

[0242] (3) The method for producing a printed article according to (2) above, wherein the adhesion of the first base layer to the substrate is higher than the adhesion of the second base layer to the substrate.

[0243] (4) The method for producing a printed article according to any one of (1) to (3) above, wherein the base layer is formed by a droplet discharge method or a bar coating method.

[0244] (5) The method for producing a printed article according to any one of (1) to (4) above, wherein the base layer has a size including the printed layer when the substrate is viewed in a normal direction to the surface.

[0245] (6) The method for producing a printed article according to any one of (1) to (5) above, wherein the printed layer is formed by a droplet discharge method.

[0246] (7) The method for producing a printed matter according to any one of (1) to (6) above, wherein the cover layer is formed by a droplet discharge method.

[0247] (8) The method for producing a printed article according to any one of (1) to (7) above, wherein the cover layer has a size including the base layer when the substrate is viewed in a normal direction to the surface.

[0248] (9) The method for producing a printed article according to any one of (1) to (8) above, wherein the cover layer has higher adhesion to the substrate than the base layer has higher adhesion to the substrate.

[0249] (10) The method for producing a printed article according to any one of (1) to (9) above, wherein the quality of the printed layer is at least one selected from the group consisting of cracks, bleeding, white turbidity, and stickiness.

[0250] (11) The method for producing a printed matter according to any one of (1) to (10) above, wherein the removal of the base layer is performed by at least one selected from the group consisting of contact with a solvent, ultraviolet irradiation, heating, and plasma treatment.

[0251] (12) The method for producing a printed article according to (11) above, wherein the contact between the base layer and the solvent is performed by immersing the base layer in the solvent.

[0252] (13) The method for producing a printed article according to (12) above, wherein when the base layer is immersed in the solvent, at least one selected from the group consisting of ultrasonic irradiation, heating, and shaking is performed.

[0253] (14) A method for manufacturing a printed matter according to any one of (1) to (13) above, wherein a temporary covering layer forming step is provided between the printing layer forming step and the printing quality confirmation step, and in the temporary covering layer forming step, a temporary covering layer is formed to cover the printing layer.

[0254] (15) A method for manufacturing a printed matter according to any one of (1) to (14) above, wherein the substrate after the printing layer is removed together with the base layer is again provided to the base layer forming step, the printing layer forming step, the printing quality confirmation step and the post-processing step.

[0255] (16) A method for producing a printed article according to any one of (1) to (15) above, wherein after forming the covering layer covering the printed layer, when it is necessary to remove the printed layer, a through portion is formed that penetrates the covering layer in the thickness direction.

[0256] The above describes the embodiments and variations of the present invention, but these are provided as examples and do not limit the scope of the invention. The novel embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. The embodiments and their variations are included in the scope and spirit of the invention, and are also included in the invention described in the claims and their equivalents.

[0257] (Example)

[0258] Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[0259] 1. Preparation of Materials

[0260] First, prepare the following materials.

[0261] <Base Material>

[0262] Substrate 1: PET film (manufactured by Toray Industries, Inc., “Lumirror S10”)

[0263] Substrate 2: PET film (manufactured by PANAC Corporation, "Gelpoly 50UV-IJ")

[0264] Substrate 3: PET film (manufactured by Higashiyama Film Co., Ltd., "HK-31WF")

[0265] ·Substrate 4: PET film (manufactured by Toyobo Co., Ltd., "U292W")

[0266] <First Ink (Ink for Forming Underlying Layer)>

[0267] · Ink 1: 3D support material (manufactured by MIMAKI ENGINEERING CO., LTD., "SW-100")

[0268] · First ink 2: Ink containing polyallylamine (manufactured by NITTOBO MEDICAL CO., LTD., "PPA-01 (molecular weight: 1600)")

[0269] · First ink 3: Ink containing polyallylamine (manufactured by NITTOBO MEDICAL CO., LTD., "PPA-03 (molecular weight: 3000)")

[0270] <Second Ink (Printing Layer Forming Ink)>

[0271] · Second ink 1: Water-based ink (manufactured by MIMAKI ENGINEERING CO., LTD.)

[0272] · Second ink 2: Photocurable ink (Made by MIMAKI ENGINEERING CO., LTD., "LUS-170")

[0273] · Second ink 3: Solvent ink (manufactured by MIMAKI ENGINEERING CO., LTD., "SS21")

[0274] <Third Ink (Ink for Forming Covering Layer)>

[0275] · Third ink 1: Photocurable ink (manufactured by MIMAKI ENGINEERING CO., LTD., "TCU-100")

[0276] · Third ink 2: Photocurable ink (manufactured by MIMAKI ENGINEERING CO., LTD., “LH-100CL”)

[0277] 2-1. Formation of base layer and printed layer

[0278] The size of the substrates used below was 12 mm×12 mm.

[0279] (Sample No.1A)

[0280] <Base layer forming step>

[0281] First, the first ink 1 is supplied to the upper surface of the substrate 1 by a bar coating method to form a liquid coating having a thickness of 2 μm.

[0282] Next, the liquid coating was irradiated with ultraviolet light at room temperature (25° C.). Thus, the liquid coating was cured to form a base layer. The intensity of the ultraviolet light was set to 466 mW / cm 2 , set the energy of UV light to 336mJ / cm 2 .

[0283] <Printing layer forming process>

[0284] First, the second ink 1 was ejected onto the upper surface of the base layer by inkjet method (liquid droplet ejection method) to form a liquid coating having a thickness of 14 to 42 μm. The temperature of the flat heater of the inkjet device was set to 60°C.

[0285] Next, the liquid coating was heat-treated in air at 80° C. for 10 minutes, thereby solidifying the liquid coating to form a printed layer.

[0286] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the substrate 1 is observed from the normal direction of the upper surface.

[0287] (Sample No.2A)

[0288] A base layer and a printed layer were formed in the same manner as in Sample No. 1A except that the thickness of the liquid coating formed by the first ink 1 was changed to 10 μm.

[0289] (Sample No.3A)

[0290] A base layer and a printed layer were formed in the same manner as in Sample No. 1A except that the base material 2 was used instead of the base material 1.

[0291] (Sample No.4A)

[0292] A base layer and a printed layer were formed in the same manner as in Sample No. 3A except that the thickness of the liquid coating formed by the first ink 1 was changed to 10 μm.

[0293] (Sample No.5A)

[0294] <Base layer forming step>

[0295] First, the first ink 1 is supplied to the upper surface of the substrate 3 by a bar coating method to form a liquid coating having a thickness of 0.1 μm.

[0296] Next, the liquid coating was irradiated with ultraviolet light at room temperature (25° C.). Thus, the liquid coating was cured to form a base layer. The intensity of the ultraviolet light was set to 466 mW / cm 2 , set the energy of UV light to 336mJ / cm 2 .

[0297] <Printing layer forming process>

[0298] First, the second ink 2 was ejected onto the upper surface of the base layer by inkjet method (liquid droplet ejection method) to form a liquid coating with a thickness of 23 to 69 μm. The flat heater of the inkjet device was not operated.

[0299] Next, the liquid coating was irradiated with ultraviolet light at room temperature (25° C.). Thus, the liquid coating was cured to form a base layer. The intensity of the ultraviolet light was set to 370 mW / cm 2 , set the energy of UV light to 710mJ / cm 2 .

[0300] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the base material 3 is observed from the normal direction of the upper surface.

[0301] (Sample No.6A)

[0302] A base layer and a printed layer were formed in the same manner as in Sample No. 5A except that the thickness of the liquid coating formed by the first ink 1 was changed to 13.7 μm.

[0303] (Sample No.7A)

[0304] A base layer and a printed layer were formed in the same manner as in Sample No. 5A except that the base material 4 was used instead of the base material 3 .

[0305] (Sample No.8A)

[0306] A base layer and a printed layer were formed in the same manner as in Sample No. 7A except that the thickness of the liquid coating formed by the first ink 1 was changed to 13.7 μm.

[0307] (Sample No.9A)

[0308] <Base layer forming step>

[0309] First, the first ink 1 is supplied to the upper surface of the substrate 3 by a bar coating method to form a liquid coating having a thickness of 0.1 μm.

[0310] Next, the liquid coating was irradiated with ultraviolet light at room temperature (25° C.). Thus, the liquid coating was cured to form a base layer. The intensity of the ultraviolet light was set to 466 mW / cm 2 , set the energy of UV light to 366mJ / cm 2 .

[0311] <Printing layer forming process>

[0312] First, the second ink 3 was ejected onto the upper surface of the base layer by inkjet method (liquid droplet ejection method) to form a liquid coating having a thickness of 19 to 57 μm. The temperature of the flat heater of the inkjet device was set to 45°C.

[0313] Next, the liquid coating was heat-treated in the air at 60° C. for 18 hours, thereby solidifying the liquid coating to form a printed layer.

[0314] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the base material 3 is observed from the normal direction of the upper surface.

[0315] (Sample No.10A)

[0316] A base layer and a printed layer were formed in the same manner as in Sample No. 9A except that the thickness of the liquid coating formed by the first ink 1 was changed to 13.7 μm.

[0317] (Sample No.11A)

[0318] A base layer and a printed layer were formed in the same manner as in Sample No. 9A except that the base material 2 was used instead of the base material 3 .

[0319] (Sample No.12A)

[0320] A base layer and a printed layer were formed in the same manner as in Sample No. 11A except that the thickness of the liquid coating formed by the first ink 1 was changed to 13.7 μm.

[0321] (Sample No.1B)

[0322] <Base layer forming step>

[0323] First, the first ink 2 is supplied to the upper surface of the substrate 1 by a bar coating method to form a liquid coating having a thickness of 2 μm.

[0324] <Printing layer forming process>

[0325] First, the second ink 1 was ejected onto the upper surface of the liquid coating by inkjet method (liquid droplet ejection method) to form (laminate) a liquid coating having a thickness of 14 to 42 μm. The flat heater of the inkjet device was not operated.

[0326] Next, the laminated liquid coating was heat-treated in the air at 80° C. for 10 minutes, thereby solidifying the laminated liquid coating to form a base layer and a printed layer.

[0327] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the substrate 1 is observed from the normal direction of the upper surface.

[0328] (Sample No.2B)

[0329] A base layer and a printed layer were formed in the same manner as in Sample No. 1B except that the thickness of the liquid coating formed by the first ink 2 was changed to 10 μm.

[0330] (Sample No.3B)

[0331] A base layer and a printed layer were formed in the same manner as in Sample No. 1B except that the base material 2 was used instead of the base material 1.

[0332] (Sample No.4B)

[0333] A base layer and a printed layer were formed in the same manner as in Sample No. 3B except that the thickness of the liquid coating formed by the first ink 2 was changed to 10 μm.

[0334] (Sample No.5B)

[0335] <Base layer forming step>

[0336] First, the first ink 3 is supplied to the upper surface of the substrate 1 by a bar coating method to form a liquid coating having a thickness of 2 μm.

[0337] <Printing layer forming process>

[0338] First, the second ink 1 was ejected onto the upper surface of the liquid coating by inkjet method (liquid droplet ejection method) to form (laminate) a liquid coating having a thickness of 14 to 42 μm. The flat heater of the inkjet device was not operated.

[0339] Next, the laminated liquid coating was heat-treated in the air at 80° C. for 10 minutes, thereby solidifying the laminated liquid coating to form a base layer and a printed layer.

[0340] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the substrate 1 is observed from the normal direction of the upper surface.

[0341] (Sample No.6B)

[0342] A base layer and a printed layer were formed in the same manner as in Sample No. 5B except that the thickness of the liquid coating formed by the first ink 3 was changed to 10 μm.

[0343] (Sample No.7B)

[0344] A base layer and a printed layer were formed in the same manner as in Sample No. 5B except that the base material 2 was used instead of the base material 1.

[0345] (Sample No.8B)

[0346] A base layer and a printed layer were formed in the same manner as in Sample No. 7B except that the thickness of the liquid coating formed by the first ink 3 was changed to 10 μm.

[0347] (Sample No.9B)

[0348] <Base layer forming step>

[0349] First, the first ink 2 is supplied to the upper surface of the substrate 1 by a bar coating method to form a liquid coating having a thickness of 2 μm.

[0350] Next, the liquid coating was heat-treated in the air at 80° C. for 10 minutes, thereby solidifying the liquid coating to form a base layer.

[0351] <Printing layer forming process>

[0352] First, the second ink 1 was ejected onto the upper surface of the base layer by inkjet method (liquid droplet ejection method) to form a liquid coating having a thickness of 14 to 42 μm. The temperature of the flat heater of the inkjet device was set to 60°C.

[0353] Next, the laminated liquid coating was heat-treated in the air at 80° C. for 10 minutes, thereby solidifying the laminated liquid coating to form a base layer and a printed layer.

[0354] It should be noted that the shape and size of the base layer are set to be consistent with the shape and size of the printed layer when the substrate 1 is observed from the normal direction of the upper surface.

[0355] (Sample No.10B)

[0356] A base layer and a printed layer were formed in the same manner as in Sample No. 9B except that the thickness of the liquid coating formed by the first ink 2 was changed to 10 μm.

[0357] 2-2. Evaluation

[0358] <Quality Confirmation of Printed Layer>

[0359] Evaluate the state (image quality) of the upper surface of the printed layer through visual and palpatory observations.

[0360] <X-Cut Test>

[0361] Form slits in the printed layer in a checkerboard pattern to form multiple partitions, then attach tape to the printed layer. Subsequently, peel off the tape from the printed layer and confirm the state of the upper surface of the printed layer.

[0362] It should be noted that in the table, record the proportion of partitions that remain unpeeled on the substrate (if not peeled, set it to "10"). If the printed layer is sticky and the X-cut test is not performed, record it as "sticky".

[0363] <Nail Friction Test>

[0364] Rub the upper surface of the printed layer with a nail 10 times and evaluate according to the following criteria.

[0365] ○: Not peeled.

[0366] △: Peels off during strong rubbing.

[0367] ×: Peels off easily.

[0368] <Water Immersion Test>

[0369] Put the sample and water (25°C) into a vial and gently shake, then observe the degree of peeling of the printed layer. It should be noted that when applying ultrasonic waves, set the frequency to 38 kHz.

[0370] Show their results in Tables 1 and 2 below.

[0371] [Table 1]

[0372]

[0373] As shown in Table 1, it can be seen that when using a 3D support material to form the base layer, the compatibility with the printed layer formed by the photocurable ink is good.

[0374] In addition, it can be seen that when using a 3D support material to form the base layer, regardless of the type of the second ink used in the formation of the printed layer, the printed layer (base layer) can be easily peeled off by immersion in water.

[0375] Furthermore, when using a 3D support material to form the base layer, those with a thinner thickness are less likely to affect the strength of the printed layer. It can also be confirmed that the ease of peeling caused by immersion in water does not depend on the thickness of the base layer.

[0376] Note that, in Samples No. 1A to 4A and 9A to 12A, the printed layer was sticky and had low strength. In such a case, it is considered effective to form a temporary covering layer before forming the covering layer.

[0377] [Table 2]

[0378]

[0379] As shown in Table 2, when the base layer is formed using an ink containing polyallylamine, the printed layer tends to be turbid when a water-based ink is used to form the printed layer. This can be eliminated by studying the type of solvent for the first ink, the type of the second ink, etc., that is, by selecting the combination of the first ink and the second ink.

[0380] In addition, the printed layer (underlayer) remaining after applying ultrasonic waves for 60 minutes could be easily peeled off by friction.

[0381] Furthermore, it was found that when the printed layer was formed by curing or solidifying the polyallylamine-containing ink, the printed layer (underlayer) was more easily peeled off when immersed in water than when the printed layer was formed by wet-on-wet.

[0382] 3-1. Formation of covering layer

[0383] (Sample No.1C)

[0384] <Coating Layer Formation Step>

[0385] First, the third ink 1 was supplied in droplets by a bar coating method so as to cover the printed layer and part of the base layer of sample No. 5A, thereby forming a liquid coating having a thickness of 22.9 μm.

[0386] Next, the liquid coating was irradiated with ultraviolet light at room temperature (25° C.). As a result, the liquid coating was cured to form a coating layer. The intensity of the ultraviolet light was set to 466 mW / cm 2 , set the energy of UV light to 336mJ / cm 2 .

[0387] (Sample No.2C)

[0388] A covering layer was formed in the same manner as in Sample No. 1C except that the third ink 2 was used instead of the third ink 1.

[0389] (Sample No.3C)

[0390] The covering layer was formed in the same manner as in Sample No. 1C except that the covering layer was formed so as to cover the entire printed layer and the base layer.

[0391] 3-2. Evaluation

[0392] <Confirmation of the quality of the cover layer>

[0393] The cover layer was visually observed to evaluate the presence or absence of uneven image quality.

[0394] <Nail friction test>

[0395] Proceed in the same manner as above.

[0396] <Water immersion test>

[0397] Proceed in the same manner as above.

[0398] The results are shown in Table 3 below.

[0399] [Table 3]

[0400] Table 3

[0401]

[0402] In Table 3, "※" indicates that peeling of the printed layer was not observed in the portion covered by the covering layer, but peeling of the printed layer was observed in the portion not covered by the covering layer.

[0403] As shown in Table 3, it can be seen that the formation of the cover layer prevented the printed layer from peeling off even in the nail rubbing test.

[0404] It was also confirmed that, by forming the cover layer, peeling of the printed layer did not occur even after immersion in water for 91 hours and application of ultrasonic waves for 30 minutes.

[0405] 4. The influence of time in normal temperature and humidity environment

[0406] (Sample No.1D)

[0407] A base layer and a printed layer were formed in the same manner as in Sample No. 5A except that a substrate 3 of 100 mm×160 mm was used.

[0408] (Sample No.2D)

[0409] A base layer, a printed layer, and a cover layer were formed in the same manner as in Sample No. 3C except that a substrate 3 of 100 mm×160 mm was used.

[0410] Next, the changes in the printed layer and cover layer of Sample Nos. 1D and 2D immediately after formation and after being left in a normal temperature and humidity environment for 3 months were examined.

[0411] The results are shown in Table 4 below.

[0412] [Table 4]

[0413] Table 4

[0414]

[0415] As shown in Table 4, when the printed layer was not formed for 3 months, the bleeding degree in the printed layer (especially the light-colored portion) tended to worsen. By forming the covering layer, no change was observed in the bleeding degree, but the gloss tended to decrease.

[0416] Furthermore, after leaving it for 3 months, even if a coating layer was formed, the printed layer was easily peeled off in the nail friction test. It should be noted that no change was observed in the water immersion test.

[0417] It should be noted that, regarding the printed layer (image) of the sample, cyan, magenta, yellow, and black were printed at a printing density of 20 to 100% (in increments of 20%) for each color. In addition, for the mixed color of magenta and yellow, the mixed color of cyan and yellow, and the mixed color of cyan and magenta, each color was printed at a printing density of 40 to 200% (in increments of 40%). Furthermore, for the mixed color of cyan, magenta, and yellow, it was printed at a printing density of 60 to 300% (in increments of 60%).

[0418] “Only the color density 20% peels off” in Table 4 means that peeling occurs in cyan with a print density of 20%, magenta with a print density of 20%, yellow with a print density of 20%, and black with a print density of 20%.

[0419] 5. Effect of time in high temperature and high humidity environment

[0420] The printed layer and cover layer of Sample Nos. 1D and 2D were examined for changes immediately after formation and after being left in a high-temperature, high-humidity environment (35° C., 90% RH) for one day and three months.

[0421] The results are shown in Table 5 below.

[0422] [Table 5]

[0423] Table 5

[0424]

[0425] As shown in Table 5, under a high temperature and high humidity environment (harsh environment), even if a cover layer is formed, the image quality and the peel strength decrease over time.

[0426] In such a case, it is considered effective to remove the base layer, the printed layer, and the cover layer from the substrate and reuse the substrate.

[0427] 6. Study on Friction Resistance

[0428] (Sample No.1E)

[0429] A base layer and a printed layer were formed in the same manner as in Sample No. 5A except that a substrate 3 of 100 mm×160 mm was used.

[0430] (Sample No.2E)

[0431] A base layer, a printed layer, and a cover layer were formed in the same manner as in Sample No. 3C except that a substrate 3 of 100 mm×160 mm was used.

[0432] Next, the printed layers and cover layers of Samples No. 1E and 2E were subjected to a dry friction test and a wet friction test as follows.

[0433] Dry friction test: Using a Gakushin friction tester, a dry cotton broadcloth was reciprocated on the sample at a height of 0 mm and a load of 1000 g.

[0434] Wet friction test: Using a Gakushin type friction tester, a cotton broad cloth impregnated with water was reciprocated on the sample at a height of 0 mm and a load of 1000 g.

[0435] As a result, in the dry friction test, when the cover layer was not formed, peeling of the printed layer was observed after 100 reciprocating motions. In contrast, when the cover layer was formed, the printed layer was not damaged even after 2000 reciprocating motions.

[0436] In the wet friction test, when the cover layer was not formed, slight damage was confirmed on the surface of the printed layer after 2000 reciprocating motions. In contrast, when the cover layer was formed, the printed layer was not damaged even after 2000 reciprocating motions.

[0437] Based on the above, by appropriately combining the constituent materials of the base layer and the constituent materials of the printed layer, a high-quality printed layer can be formed.

[0438] When the quality of the printed layer does not meet the required standard, the printed layer can be removed together with the base layer, so the base material can be reused.

[0439] Furthermore, if a printed layer having a quality that meets a required standard is formed, a printed article as a final product can be obtained by forming a cover layer, and the printed article can maintain the quality of the printed layer for a long period of time.

[0440] Furthermore, when the cover layer in the final product deteriorates over time, the base layer, the printed layer, and the cover layer can be removed to reuse the substrate.

[0441] Description of Reference Numerals

[0442] 1: Base material

[0443] 2: Basal layer

[0444] 2a: Central basal layer

[0445] 2b: Peripheral basal layer

[0446] 3: Printing layer

[0447] 3a: Central printing layer

[0448] 3b: Peripheral printing layer

[0449] 4: Covering layer

[0450] 4a: Central covering layer

[0451] 4b: Peripheral covering

[0452] S1: Base layer forming process

[0453] S2: Printing layer forming process

[0454] S3: Printing quality confirmation process

[0455] S4: Covering layer formation judgment process

[0456] S5: Covering layer forming process

[0457] S6: Base layer removal process

[0458] S7: Temporary covering layer formation judgment process

[0459] S8: Temporary covering layer forming step.

Claims

1. A method for producing a printed matter, comprising: a base layer forming step, a printing layer forming step, a printing quality confirmation step and a post-processing step, In the base layer forming step, a base layer that can be removed from the base material is formed on the surface of the base material. In the printing layer forming step, a printing layer is formed on a surface of the base layer opposite to the substrate. In the printing quality confirmation step, the quality of the printing layer is confirmed. In the post-processing step, depending on the quality of the printed layer, a cover layer is formed to cover the printed layer, or the printed layer is removed from the substrate together with the base layer.

2. The method for producing a printed matter according to claim 1, wherein: As the base layer, a first base layer is formed on the substrate side, and a second base layer is formed on the side of the first base layer opposite to the substrate, wherein the second base layer has higher adhesion to the printed layer than the first base layer.

3. The method for producing a printed matter according to claim 2, wherein: The first base layer has higher adhesion to the substrate than the second base layer has higher adhesion to the substrate.

4. The method for producing a printed matter according to claim 1, wherein: The base layer is formed by a droplet dispensing method or a bar coating method.

5. The method for producing a printed matter according to claim 1, wherein: When the substrate is observed from a normal direction of the surface, the base layer has a size including the printed layer.

6. The method for producing a printed matter according to claim 1, wherein: The printed layer is formed by a droplet discharge method.

7. The method for producing a printed matter according to claim 1, wherein: The cover layer is formed by a droplet discharge method.

8. The method for producing a printed matter according to claim 1, wherein: When the substrate is viewed from a normal direction of the surface, the cover layer has a size that includes the base layer.

9. The method for producing a printed matter according to claim 1, wherein: The cover layer has higher adhesion to the substrate than the base layer has higher adhesion to the substrate.

10. The method for producing a printed matter according to claim 1, wherein: The quality of the printed layer is at least one selected from the group consisting of cracks, bleeding, white turbidity, and stickiness.

11. The method for producing a printed matter according to claim 1, wherein: The base layer is removed by at least one selected from the group consisting of contact with a solvent, ultraviolet irradiation, heating, and plasma treatment.

12. The method for producing a printed matter according to claim 11, wherein: The contact between the base layer and the solvent is performed by immersing the base layer in the solvent.

13. The method for producing a printed matter according to claim 12, wherein: When the base layer is immersed in the solvent, at least one selected from the group consisting of ultrasonic irradiation, heating, and shaking is performed.

14. The method for producing a printed matter according to claim 1, wherein: A temporary covering layer forming step is further provided between the printing layer forming step and the printing quality checking step. In the temporary covering layer forming step, a temporary covering layer is formed to cover the printed layer.

15. The method for producing a printed matter according to claim 1, wherein: The substrate from which the printing layer is removed together with the base layer is again subjected to the base layer forming step, the printing layer forming step, the printing quality checking step, and the post-processing step.

16. The method for producing a printed matter according to claim 1, wherein: After the covering layer covering the printed layer is formed, when it is necessary to remove the printed layer, a through portion penetrating the covering layer in the thickness direction is formed.

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