Printed Substrate and Method for Manufacturing the Same

Abstract

The present invention provides a novel printing substrate and the like. The printing substrate is made into a printing substrate having a printing portion on the substrate, wherein the printing portion includes a different-color printing portion printed with different colors with a gap therebetween.

Description

Technical Field

[0001] The present invention relates to a novel printing substrate and the like. Background Art

[0002] In the past, various printing methods (image recording methods) have been known. For example, the inkjet method is a printing method (printing mode) that sprays minute ink droplets for printing (recording or forming an image).

[0003] In addition, as the ink for the inkjet, various inks have been known depending on printing performance, the type of substrate to be printed, coating film performance, etc. (for example, Patent Document 1).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017 - 132946 Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] An object of the present invention is to provide a novel printing substrate and a method for manufacturing the same, etc.

[0009] As described above, various printing methods have been known in the past. However, when printing in such a way that inks of different colors (color inks) are adjacent (not separated), there is a case where the inks are mixed between the adjacent colors (the boundary portion between different colors), resulting in bleeding (color mixing).

[0010] According to the research of the inventors of the present application, bleeding between different colors is likely to occur in a printing method that prints (image - records) ink in dots such as the inkjet method. In such a printing method, particularly when printing on a non - absorbent or low - absorbent (liquid - absorbing) substrate (for example, a plastic film, etc.), when using water - based ink, when printing by stacking color ink and transparent ink, etc., bleeding between different colors can be significantly confirmed.

[0011] Although inks of different colors are adjacent, they are of course printed at positions (points) that do not overlap each other. It is extremely difficult to solve such a bleeding problem.

[0012] Technical Means for Solving the Technical Problem

[0013] In this case, the inventors of the present application conducted earnest research and as a result, found that when printing inks of different colors adjacent to each other, by printing in such a way as to create a gap between different colors, bleeding between adjacent colors can be effectively solved. Further research led to the completion of the present invention.

[0014] That is, the present invention relates to the following inventions, etc.

[0015] (1) A printed substrate having a printed portion on a substrate, wherein the printed portion includes (at least includes) a different-color printed portion printed with different colors with a gap therebetween.

[0016] (2) A printed substrate having a printed portion on a substrate, wherein the printed portion at least includes a different-color printed portion printed with different colors adjacent to each other without bleeding.

[0017] (3) The printed substrate according to (1) or (2), wherein the wetting tension of the printed surface of the substrate is 30 to 50 dyn / cm.

[0018] (4) The printed substrate according to any one of (1) to (3), wherein the substrate is a plastic film.

[0019] (5) The printed substrate according to any one of (1) to (4), wherein the printed surface of the substrate is made of a polyester resin.

[0020] (6) The printed substrate according to any one of (1) to (5), wherein the printed portion is printed by an inkjet method.

[0021] (7) The printed substrate according to any one of (1) to (6), wherein the printed portion is formed of an aqueous ink.

[0022] (8) The printed substrate according to any one of (1) to (7), wherein the printed portion is formed of a color ink and a transparent ink.

[0023] (9) The printed substrate according to any one of (1) to (8), wherein the printed portion is formed of an aqueous color ink and an aqueous transparent ink.

[0024] (10) The printed substrate according to any one of (1) to (9), wherein the proportion of the resin in the printed portion with respect to the total amount of the resin and the colorant is 20% by mass or more.

[0025] (11) The printed substrate according to any one of (1) to (10), wherein the width of the gap is 10 to 1500 μm.

[0026] (12) The printed substrate according to any one of (1) to (11), wherein the different-color printed portion includes: when different colors are set as color 1 and color 2, and the width of color 1 or the width of color 2 is set as A (μm) and the width of the gap is set as B (μm), a different-color printed portion in which the value of B / A is 8 or less.

[0027] (13) The printed substrate according to any one of (1) to (12), wherein the different-color printing portion includes a different-color printing portion where, when the printing resolution is set to X (dpi) and the number of pixels corresponding to the width of the gap is set to Y, the value of X / Y is 20 to 800.

[0028] (14) The printed substrate according to any one of (1) to (13), wherein the different-color printing portion includes a different-color printing portion 1 where, when different colors are set to color 1 and color 2, the width of color 1 or the width of color 2 is 500 μm or less, and when the printing resolution is set to X (dpi) and the number of pixels corresponding to the width of the gap is set to Y, the value of X / Y is 50 or more.

[0029] (15) The printed substrate according to (14), wherein in the different-color printing portion 1, the width of color 1 or the width of color 2 is 400 μm or less, and the value of X / Y is 100 or more.

[0030] (16) The printed substrate according to any one of (1) to (15), wherein the different-color printing portion includes a different-color printing portion 2 where, when different colors are set to color 1 and color 2, the width of color 1 or the width of color 2 is greater than 500 μm, and when the printing resolution is set to X (dpi) and the number of pixels corresponding to the width of the gap is set to Y, the value of X / Y is 200 or less.

[0031] (17) The printed substrate according to (16), wherein in the different-color printing portion 2, the width of color 1 or the width of color 2 is 600 μm or more, and the value of X / Y is 150 or less.

[0032] (18) The printed substrate according to any one of (1) to (17), wherein the different-color printing portion includes the different-color printing portion 1 described in (14) or (15), and the different-color printing portion 2 described in (16) or (17).

[0033] (19) The printed substrate according to any one of (1) to (18), wherein the different-color printing portion includes a different-color printing portion where any one of the different colors is white.

[0034] (20) The printed substrate according to any one of (1) to (19), wherein the different-color printing portion includes a different-color printing portion where, when different colors are set to color 1 and color 2, color 1 is a pattern and color 2 is a background.

[0035] (21) The printed substrate according to any one of (1) to (20), wherein the different-color printing portion includes a different-color printing portion that can be recognized in the form of a bar code or a two-dimensional code where, when different colors are set to color 1 and color 2, color 1 is a bar code or a two-dimensional code and color 2 is a background.

[0036] (22) The printed substrate according to any one of (1) to (21), wherein the printed substrate is used to form a medical flexible bag (for example, an infusion bag).

[0037] (23) A method for manufacturing a printed substrate, which is a method for manufacturing the printed substrate according to any one of (1) to (22) by at least a printing process of printing a printing portion on a substrate, wherein, in the printing process, different-color printing portions are printed in such a manner that a gap is provided between different colors.

[0038] (24) A method for suppressing or preventing bleeding between different colors of different-color printing portions in a printed substrate having a printing portion on a substrate and the printing portion including different-color printing portions printed adjacent to each other, wherein, in the printing process of printing the printing portion on the substrate, different-color printing portions are printed in such a manner that a gap is provided between different colors.

[0039] (25) The method according to (23) or (24), wherein printing is performed by an inkjet method.

[0040] (26) The method according to any one of (23) to (25), wherein, in the printing process, colored ink and transparent ink are ejected for printing.

[0041] (27) The method according to any one of (23) to (26), wherein printing is performed in such a manner that the width of the gap is 10 to 1500 μm.

[0042] (28) The method according to any one of (23) to (27), wherein when different colors are set as color 1 and color 2, and the width of color 1 or the width of color 2 is set as A (μm) and the width of the gap is set as B (μm), the gap is provided in such a manner that the value of B / A is 8 or less.

[0043] (29) The method according to any one of (23) to (28), wherein when the printing resolution is set as X (dpi) and the number of pixels corresponding to the width of the gap is set as Y, the gap is provided in such a manner that the value of X / Y is 20 to 800.

[0044] (30) A molded article, which is a molded article of the printed substrate according to any one of (1) to (22).

[0045] (31) The molded article according to (30), wherein the molded article is a medical flexible bag.

[0046] Advantages of the Invention

[0047] According to the present invention, a novel printing substrate and a manufacturing method of the novel printing substrate can be provided. According to such a printing substrate or manufacturing method, bleeding between different colors can be effectively prevented (or suppressed). According to such a printing substrate or method, even when different colors (inks of different colors) are printed adjacent to each other, visibility or designability will not be impaired due to bleeding, which is preferable. In particular, when the printing substrate is a packaging material for pharmaceuticals, by preventing the decrease in visibility caused by bleeding, medical accidents such as misappropriating pharmaceuticals can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A close-up photograph of the different-color printing portion 1 in the printing substrate obtained in Example 1.

[0049] Figure 2 A micrograph of the different-color printing portion 1 in the printing substrate obtained in Example 1.

[0050] Figure 3 A close-up photograph of the different-color printing portion 2 in the printing substrate obtained in Example 1.

[0051] Figure 4 A micrograph of the different-color printing portion 2 in the printing substrate obtained in Example 1.

[0052] Figure 5 A close-up photograph of the different-color printing portion 3 in the printing substrate obtained in Example 1.

[0053] Figure 6 A micrograph of the different-color printing portion 3 in the printing substrate obtained in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0054] <Printing Substrate>

[0055] The printing substrate has a printing portion (coating film, laminated film) on the substrate. In other words, the printing substrate has a substrate and a printing portion formed (provided) on the substrate.

[0056] In addition, the printing portion at least has a printing portion (different-color printing portion) printed with different colors, and in the present invention, the different-color printing portion has a feature.

[0057] That is, in the first aspect of the present invention, in the different-color printing portion, different colors are printed adjacent to each other (without separation) without bleeding. As described above, when different colors are printed adjacent to each other, bleeding may occur between the adjacent different colors, but in the first aspect, different colors are printed adjacent to each other without such bleeding.

[0058] In addition, in the second embodiment of the present invention, in this different-color printing section, different colors are printed with a gap (void) therebetween (with a gap between different colors).

[0059] Further, in the second embodiment, since there is a gap between different colors, generally the same as in the first embodiment, bleeding (color mixing) does not occur between different colors.

[0060] And, as described later, the printing substrates of the first and second embodiments of the present invention are generally printed in such a manner that a gap is formed between different colors, and thus can be obtained effectively.

[0061] After such printing, if the gap set during printing is reflected in the different-color printing section, a different-color printing section (the different-color printing section of the second embodiment) having a gap between different colors is formed.

[0062] On the other hand, even when printing is performed in such a manner as to produce a gap (set with a set gap), due to the type of substrate, the type of ink, or the printing method, etc., there is a case where the inks of different colors slightly spread into each other's colors.

[0063] At this time, by adjusting the size of the gap so that the size (width) of the gap matches the size (width) of the spread, even if the inks of different colors approach and spread into each other's colors, bleeding does not occur, and a different-color printing section (the different-color printing section of the first embodiment) that apparently has no gap between different colors is formed.

[0064] Therefore, the first embodiment can also be referred to as a special form of the second embodiment (a form in which the gap set during printing is not apparently reflected in the different-color printing section and bleeding does not occur).

[0065] Hereinafter, a further detailed description will be given.

[0066] [Substrate]

[0067] As the substrate (recording medium, medium to be printed), for example, plastics, metals, woods, papers, etc. can be cited, and a substrate composed of a combination of these materials can also be used.

[0068] As plastics, for example, polyester resins (e.g., polyethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate resins, olefin resins (e.g., polyethylene, polypropylene, cyclic olefin resins), halogen resins (e.g., polyvinyl chloride), acrylic resins, styrene resins, polyamide resins, etc. can be cited.

[0069] The type of the base material (material) can be selected according to uses, operability, productivity, printability, etc. For example, from the viewpoints of printability or high-speed bag-making property (high-speed sealing property), etc., polyester resins can be suitably used.

[0070] The shape of the base material can be any one of a one-dimensional shape (e.g., rod shape), a two-dimensional shape [e.g., film (or sheet) shape], a three-dimensional shape (e.g., various molded articles), etc. As a representative shape, it can be a film (sheet) shape.

[0071] The film-shaped base material can be a stretched film.

[0072] In addition, the film-shaped base material can be a laminated film or can be in a bag shape (tubular, tube film, blown film), etc.

[0073] The base material can be a base material subjected to a coating treatment (e.g., coated paper) or a base material subjected to a surface treatment (e.g., corona discharge treatment, plasma treatment).

[0074] In addition, in the base material, the treatment can be performed at least on a printing portion (recording portion, portion where a printing portion is formed, e.g., the printing surface of a film-shaped base material) (hereinafter, the same applies to the characteristics and physical properties of the base material, etc.).

[0075] The base material can also be transparent according to its material.

[0076] Representative base materials include plastic films (especially transparent plastic films).

[0077] In addition, the base material can be colored or colorless.

[0078] The base material (the printing surface of the base material, the portion where a printing portion is formed) can especially be low liquid-absorbing or non-liquid-absorbing (especially low water-absorbing or non-water-absorbing). In the present invention, even for such a base material, a different-color printing portion in which bleeding between different colors does not occur (or having a gap) can be effectively formed.

[0079] The wetting tension of the base material (the printing surface of the base material, the portion where a different-color printing portion is formed) is, for example, 25 to 55 dyn / cm, preferably 28 to 52 dyn / cm, and more preferably about 30 to 50 dyn / cm (e.g., 32 to 45 dyn / cm, 33 to 42 dyn / cm).

[0080] The wetting tension can be measured, for example, in accordance with JIS K6768. As a wetting agent, for example, a mixed solution for wetting tension test (manufactured by FUJIFILM Wako Pure Chemical Corporation, etc.), a dynabead for wettability inspection (enerdyne series, manufactured by ENERCON GmbH, etc.) can be used.

[0081] As a specific method, the tip of a cotton swab or the like is immersed in the mixed solution for wetting tension test, and the surface of the printed matter is wetted with this cotton swab. Methods such as investigating the areas where the liquid spreads to a certain extent and the areas where the liquid does not stick after about 2 seconds using mixed solutions with different numbers can be cited.

[0082] The wetting tension may be related to the wettability of the ink used for printing and the ease of printing (recording). However, the greater the wettability, the more likely color bleeding (bleeding) occurs between adjacent colors. In the present invention, it is possible to effectively balance sufficient printing ease (appropriate wettability) and prevention (inhibition) of color bleeding.

[0083] [Ink]

[0084] The printing section (multi-color printing section) is usually formed of ink (ink composition).

[0085] In addition, when the ink contains a volatile component (solvent component), the printing section (multi-color printing section) is composed of the components after the volatile component volatilizes (evaporates) from the ink, that is, the solid components of the ink (as described later, composed of colorants, resins, etc.).

[0086] The ink may be composed of at least color ink, and may also be combined with other inks (transparent ink, etc.) as needed.

[0087] (Color Ink)

[0088] As the colorant (color agent) contained in the color ink, any one of white-based colorants and non-white-based colorants (yellow, cyan, magenta, black, gray, red, orange, green, etc.) can be used.

[0089] The colors constituting the multi-color printing section may particularly contain at least white-based colorants. When white is included in different colors constituting the multi-color printing section (further, especially when the substrate is transparent), there is a tendency that the gaps provided in the multi-color printing section are difficult to visually confirm (not conspicuous), and it is possible to prevent color bleeding in a natural form without making the gaps conspicuous.

[0090] As the colorant, for example, dyes and pigments can be used, and pigments are preferably used. Any one of inorganic pigments and organic pigments can be used as the pigment.

[0091] As inorganic pigments, examples include metal compounds (e.g., titanium oxide, basic lead carbonate, zinc sulfide, iron oxide, red iron oxide, chromium oxide, etc.), carbon black (e.g., furnace black, acetylene black, channel black, etc.), and the like.

[0092] As organic pigments, examples include azo pigments (e.g., azo lake pigments, etc.), phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, pyrrolopyrrole dione pigments, and the like.

[0093] The color index (C.I.) of the colorant is not particularly limited. If the color indices of white pigments are exemplified, for example, C.I. Pigment White 1 (C.I.Pigment White1) (basic lead carbonate), 4 (zinc oxide), 5 (a mixture of zinc sulfide and barium sulfate), 6 (titanium oxide), 6:1 (titanium oxide containing other metal oxides), 7 (zinc sulfide), 18 (calcium carbonate), 19 (clay), 20 (mica titanium), 21 (barium sulfate), 22 (natural barium sulfate), 23 (aluminum barium white), 24 (bauxite white), 25 (gypsum), 26 (magnesium oxide - silicon oxide), 27 (silicon dioxide), 28 (anhydrous calcium silicate), etc. can be cited.

[0094] In addition, the colorant (pigment) can be surface - treated (it can be a self - dispersing pigment) or can be in a form dispersed in a dispersant (surfactant, resin, etc.) (dispersed pigment).

[0095] Colored inks usually can contain a resin (resin component). From the perspectives of the abrasion resistance or adhesion of the coating film (laminated film), a resin can be used.

[0096] As resins, examples include acrylic resins, styrene - acrylic resins, styrene resins, vinyl carboxylate resins (e.g., vinyl acetate resins), olefin resins, rosin - modified resins, terpene resins, diene resins (e.g., butadiene resins), halogen resins (e.g., vinyl chloride resins), polyester resins, urethane resins (polyurethane resins), polyamide resins, epoxy resins, etc.

[0097] In addition, as long as a resin can be formed in the coating film [e.g., by reacting (polymerizing, condensing, etc.) during drying of the coating film, polymerizing or cross - linking], a component or prepolymer as a resin precursor (e.g., polyisocyanate compounds, polyol compounds, etc.) can be used as the resin (resin component).

[0098] Resins can be used alone or in combination of two or more.

[0099] The resin may have functional groups (reactive groups). Examples of the functional groups include acid groups (e.g., carboxyl groups, etc.), amino groups, hydroxyl groups, mercapto groups, epoxy groups, isocyanate groups, carbodiimide groups, oxazoline groups, etc.

[0100] The resin may have one or more than two functional groups.

[0101] The functional groups can contribute to the crosslinking of the printed ink (coating film), etc.

[0102] The form of the resin is not limited. In particular, it can be granular (resin particles). Representatively, it can be the resin emulsion particles (resin particles constituting the emulsion). Such emulsion particles may contain a dispersant (surfactant).

[0103] The colored ink may have crosslinkability. By having crosslinkability, a stronger printed coating film can be formed.

[0104] For example, by using at least a resin having functional groups as the resin, a component (crosslinking agent) capable of reacting with the functional groups and crosslinking can be contained in the colored ink, or a crosslinking agent capable of reacting with the resin constituting the transparent ink described later can be contained in the colored ink, etc., so as to impart the crosslinkability to the colored ink.

[0105] As the crosslinking agent (crosslinkable component), it can be appropriately selected according to the types of the functional groups possessed by the resin constituting the colored ink and / or the resin constituting the transparent ink, etc.

[0106] For example, when the functional group is a carboxyl group, etc., a crosslinking agent having a reactive group for the carboxyl group (e.g., isocyanate group, epoxy group, carbodiimide group, oxazoline group, etc.) can be used.

[0107] In addition, as long as the functional group or reactive group (further the crosslinking agent) can crosslink in the printed coating film, it can be protected (blocked) in the ink (ink before printing). At this time, deprotection and crosslinking are carried out in the printed coating film.

[0108] In addition, in the printing section (colored printing section), the crosslinking agent (crosslinkable component) is a component for crosslinking the resin, that is, a component constituting the resin.

[0109] The colored ink can contain, for example, a dispersant, a surfactant, an antifoaming agent, a dissolution aid, a viscosity modifier, a pH regulator, an antioxidant, a preservative, a fungicide, a corrosion inhibitor, etc. The colored ink can contain a single one of these additives or a combination of two or more.

[0110] The color ink can be any one of oil-based, water-based, etc. Considering environmental aspects, etc., water-based ink (aqueous ink) can be suitably used. Since the drying time of water-based ink is likely to be long, bleeding between different colors is likely to occur (especially in printing on a substrate such as a plastic film, bleeding is likely to occur significantly), but in the present invention, even when using water-based ink, bleeding between different colors can be effectively suppressed.

[0111] The solvent contained in the color ink can be appropriately selected according to the classification of oil-based and water-based, etc.

[0112] For example, the solvent contained in the water-based ink can consist of at least water, and can also contain an organic solvent (water-soluble organic solvent) as needed.

[0113] As the organic solvent, for example, alcohol solvents, ether solvents, nitrogen solvents (for example, chain amide solvents such as N,N-dimethylformamide and N,N-dimethylacetamide; cyclic amide solvents such as 2-pyrrolidone, N-methyl-2-pyrrolidone, and 2-oxazolidone; urea derivatives such as 1,3-dimethyl-2-imidazolidinone and 1,1,3,3-tetramethylurea), sulfur solvents (for example, dimethyl sulfoxide, sulfolane, etc.) can be cited.

[0114] As the alcohol solvent, for example, monohydric alcohols (for example, alkanols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, tert-butanol, isobutanol, n-pentanol, 2-pentanol, 3-pentanol, tert-pentanol, etc.), polyhydric alcohols (for example, alkylene diols such as ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, etc.; polyalkylene diols such as diethylene glycol, dipropylene glycol, triethylene glycol, etc.; aliphatic polyhydric alcohols such as glycerol having 3 or more hydroxyl groups) can be cited.

[0115] As the ether solvent, for example, monoethers or polyethers of polyhydric alcohols (e.g., the polyhydric alcohols exemplified above, etc.) can be cited [e.g., alkylene glycol monoalkyl ethers such as ethylene glycol monoisopropyl ether, ethylene glycol monon-butyl ether, ethylene glycol monoter-butyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monoter-butyl ether, propylene glycol monon-propyl ether, propylene glycol monoisopropyl ether, propylene glycol monon-butyl ether, etc.; polyalkylene glycol monoalkyl ethers such as diethylene glycol monon-propyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monon-butyl ether, triethylene glycol monobutyl ether, diethylene glycol monoter-butyl ether, dipropylene glycol monon-butyl ether, dipropylene glycol monon-propyl ether, dipropylene glycol monoisopropyl ether, etc.; polyhydric alcohol polyalkyl ethers (e.g., polyalkylene glycol dialkyl ethers) such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol ethyl methyl ether, diethylene glycol butyl methyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, tripropylene glycol dimethyl ether, etc.].

[0116] The organic solvents can be used alone or in combination of two or more.

[0117] In the color ink, the proportion of each component can be appropriately selected according to the printing method (e.g., the ejection property in the inkjet method), the viscosity of the ink, etc.

[0118] For example, in the color ink, the proportion of the colorant can be, for example, 0.1% by mass or more (e.g., 0.5 - 30% by mass), preferably 1% by mass or more (e.g., 1.5 - 20% by mass), and more preferably 2% by mass or more (e.g., 3 - 15% by mass).

[0119] In addition, in the color ink, the proportion of the resin (resin component) can be, for example, 0.1% by mass or more (e.g., 0.5 - 30% by mass), preferably 1% by mass or more (e.g., 1.5 - 20% by mass), and more preferably 2% by mass or more (e.g., 3 - 15% by mass).

[0120] When the color ink contains a crosslinking agent, the proportion of the crosslinking agent varies depending on its type, the resin amount, etc., and can be, for example, 0.01% by mass or more (e.g., 0.05 - 10% by mass), preferably 1% by mass or more (e.g., 0.1 - 5% by mass), and more preferably 0.3% by mass or more (e.g., 0.5 - 3% by mass).

[0121] In the color ink, the proportion of the solvent can be selected according to the viscosity or composition of the ink, etc.

[0122] For example, in the water-based ink, the proportion of water can be, for example, 20% by mass or more (e.g., 30 - 90% by mass), preferably 40% by mass or more (e.g., 45 - 80% by mass), and more preferably 50% by mass or more (e.g., 50 - 75% by mass).

[0123] When the aqueous ink contains an organic solvent (water-soluble organic solvent), the proportion of the water-soluble organic solvent can be, for example, 1% by mass or more (e.g., 3 to 60% by mass), preferably 5% by mass or more (e.g., 8 to 50% by mass), and more preferably 10% by mass or more (e.g., 15 to 40% by mass).

[0124] At 32 °C, the viscosity of the color ink can be, for example, 1 to 80 mPa·s, preferably 2 to 50 mPa·s, and more preferably about 3 to 30 mPa·s.

[0125] In addition, the viscosity can be measured using a viscometer (e.g., E-type viscometer, B-type viscometer, Engler viscometer, etc.) or a capillary rheometer.

[0126] (Transparent ink)

[0127] The color ink can be combined with the transparent ink. Through such a combination, a printed portion (a different-color printed portion) can be formed from the color ink and the transparent ink (the ink set of the color ink and the transparent ink).

[0128] The purpose of using the transparent ink is not particularly limited. One of its purposes can be to increase the proportion of the resin in the whole ink (or the printed portion) (or the proportion of the resin relative to the colorant). Especially when printing on a substrate such as a plastic film, by increasing the resin amount, it is easy to effectively form a printed portion that is excellent in scratch resistance, adhesion, etc.

[0129] Among them, if only the resin proportion is increased, only the resin amount in the color ink needs to be increased. However, if so, there is a possibility of problems such as an increase in the viscosity of the ink and impairment of the ejection property of the inkjet method.

[0130] Therefore, from the perspective of performing effective printing, etc., the transparent ink can be suitably used.

[0131] The transparent ink usually contains a resin (resin component). As such a resin, the resins exemplified above (e.g., acrylic resins, styrene-acrylic resins, urethane resins, etc.) can be cited, and they can have the same functional groups as those described above.

[0132] In addition, the transparent ink can have crosslinkability, and its form is the same as that described above. For example, the transparent ink can contain a crosslinking agent (the components exemplified above, etc.), and the crosslinking agent can react with the resin contained in the transparent ink (e.g., a resin having a functional group) and / or the resin constituting the color ink (a resin having a functional group).

[0133] In addition, the transparent ink usually does not contain a colorant.

[0134] The transparent ink may also contain a dispersant, a surfactant, an antifoaming agent, a dissolution aid, a viscosity modifier, a pH regulator, an antioxidant, a preservative, a fungicide, a corrosion inhibitor, etc.

[0135] The transparent ink can be any one of oil-based, water-based, etc., and water-based ink (aqueous ink) can be suitably used. In particular, it is preferable that both the color ink and the transparent ink are oil-based or both are water-based. Representatively, both the color ink and the transparent ink can be water-based inks.

[0136] As described above, compared with the case of using only the color ink, by using the transparent ink (further by using the water-based ink), it may be because the amount of solvent (especially the amount of water) during printing becomes relatively larger (and the drying time becomes longer), so the ease of bleeding between different colors becomes more significant. However, in the present invention, even when using the transparent ink (further even when using the water-based ink), bleeding can be effectively suppressed.

[0137] The solvent contained in the transparent ink can be appropriately selected according to the classification of oil-based / water-based, etc.

[0138] For example, the solvent contained in the water-based ink can consist of at least water, and can also contain an organic solvent (water-soluble organic solvent) as needed.

[0139] As the water-soluble organic solvent, the organic solvents (alcohols, ethers) exemplified above can be cited.

[0140] In the transparent ink, the proportion of the resin (resin component) can be, for example, 0.1% by mass or more (for example, 0.5 - 30% by mass), preferably 1% by mass or more (for example, 1.5 - 20% by mass), and more preferably 2% by mass or more (for example, 3 - 15% by mass).

[0141] When the transparent ink contains a crosslinking agent, the proportion of the crosslinking agent varies depending on its type, the resin amount, etc. For example, it can be 0.01% by mass or more (for example, 0.05 - 10% by mass), preferably 1% by mass or more (for example, 0.1 - 5% by mass), and more preferably 0.3% by mass or more (for example, 0.5 - 3% by mass).

[0142] In the transparent ink, the proportion of the solvent can be selected according to the viscosity or composition of the ink, etc.

[0143] For example, in the water-based ink, the proportion of water can be, for example, 20% by mass or more (for example, 30 - 90% by mass), preferably 40% by mass or more (for example, 45 - 80% by mass), and more preferably 50% by mass or more (for example, 50 - 75% by mass).

[0144] When the water-based ink contains an organic solvent (water-soluble organic solvent), the proportion of the water-soluble organic solvent can be, for example, 1% by mass or more (e.g., 3 to 60% by mass), preferably 5% by mass or more (e.g., 8 to 50% by mass), and more preferably 10% by mass or more (e.g., 15 to 40% by mass).

[0145] At 32 °C, the viscosity of the transparent ink can be, for example, 1 to 80 mPa·s, preferably 2 to 50 mPa·s, and more preferably about 3 to 30 mPa·s.

[0146] In addition, the viscosity can be measured, for example, by a viscometer (e.g., E-type viscometer, B-type viscometer, Engler viscometer, etc.) or a capillary rheometer.

[0147] [Printing section and different-color printing section]

[0148] As described above, the printing substrate has a printing section on the substrate, and the printing section at least contains a different-color printing section.

[0149] In the printing section (different-color printing section), the proportion of the resin (resin component) relative to the total amount of the resin (resin component) and the colorant can be selected according to the type of the substrate, etc. or the film coating performance, etc. For example, it can be 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, and particularly can be 50% by mass or more, etc.

[0150] The upper limit value of the proportion of the resin relative to the total amount of the resin and the colorant can be, for example, 95% by mass, 90% by mass, 85% by mass, 80% by mass, 75% by mass, 70% by mass, etc.

[0151] As specific proportions of the resin (resin component) relative to the total amount of the resin (resin component) and the colorant, for example, 10 to 95% by mass, 30 to 90% by mass, 50 to 80% by mass, etc. can be cited.

[0152] In addition, since the crosslinking agent is a component that reacts with the resin, etc., when the printing section is formed using the crosslinking agent, the crosslinking agent also constitutes the resin in the printing section.

[0153] By making the amount of resin in the printing section sufficient, as described above, even for a substrate such as a plastic film, a strong film coating (printing section) can be effectively formed.

[0154] In addition, as described above, in order to increase the amount of resin, it is suitable to use a transparent ink. As described above, in the present invention, even when such a transparent ink is used, bleeding between different colors can be effectively suppressed.

[0155] The printing section varies depending on the printing method, and in particular, it can be printed in dots. Typically, such a printing section can be formed by an inkjet method.

[0156] In addition, when printing in dots by an inkjet method or the like, the dots can be reflected on the printing section (printing section with different colors) [the printing section (printing section with different colors) can be formed in dots (the printing section is composed of dots)], or collapse and deform partially or entirely on the printing section.

[0157] Although it varies depending on the type of ink (for example, whether to use transparent ink, whether to use water-based ink, etc.) or the resolution, etc., even when printing in dots, there are cases where adjacent dots (or the ink ejected thereon) are mixed and the dots are collapsed and deformed to a large extent (for example, the dots apparently disappear). In the present invention, even in such a case where bleeding is likely to occur, bleeding between different colors can be effectively suppressed.

[0158] The density (resolution) of the dots can be appropriately selected according to the required printing section. For example, it can be selected from a range of 50 dpi or more, can be 100 dpi or more, preferably 200 dpi or more, and more preferably 300 dpi or more.

[0159] The upper limit value of the resolution can be, for example, 1200 dpi, 1000 dpi, 800 dpi, 600 dpi, etc.

[0160] As specific resolutions, for example, 50 - 1200 dpi, 200 - 1000 dpi, 300 - 800 dpi, etc. can be cited.

[0161] As described above, bleeding becomes more likely to occur as the resolution increases. However, in the present invention, even when the resolution is high, bleeding between different colors can be effectively suppressed.

[0162] In addition, in all regions of the printing section, the resolution can be the same or different. For example, in the printing direction (longitudinal direction) and the direction perpendicular to the printing direction (lateral direction), the resolution can be the same or different.

[0163] In addition, when using transparent ink, as long as it is printed (ejected) at the same position (dot) as the color ink, the dots of the color ink and the dots of the transparent ink can be the same or different (for example, at least the dots of the transparent ink can overlap with the dots of the color ink).

[0164] In the printing section with different colors, different colors are printed adjacent to each other (or with a gap therebetween).

[0165] For different colors, the width (size) of each color can be variously selected within the range from a smaller width to a larger width according to the required printing section. For example, as the widths (lengths) in different color directions, they can be greater than 500 μm (colors with a larger width, such as 550 μm or more, 600 μm or more, 800 μm or more, 1000 μm or more, 2000 μm or more, 10000 μm or more, etc.), or can be 500 μm or less (colors with a smaller width, such as 480 μm or less, 450 μm or less, 400 μm or less, 350 μm or less, 300 μm or less, 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, etc.).

[0166] In addition, the upper limit value of the width of the color is not particularly limited and can be appropriately selected according to the purpose of use of the printing substrate, etc. For example, it can be 50000 μm, 30000 μm, 10000 μm, 8000 μm, 5000 μm, 4000 μm, 3000 μm, etc.

[0167] Furthermore, the lower limit value of the width of the color can also be appropriately selected according to the purpose of use of the printing substrate, etc. For example, it can be 10 μm, 20 μm, 30 μm, 50 μm, 80 μm, 100 μm, etc.

[0168] The specific range of the width of the color can be exemplified by ranges obtained by appropriately combining the above lower limit value and upper limit value, such as 100 - 10000 μm, etc.

[0169] The widths of different colors can be the same or different. If the adjacent different colors are respectively set as color 1 and color 2 and specific examples are described, the widths of color 1 and color 2 can be the same or different (for example, the widths of both color 1 and color 2 are greater than 500 μm or both are 500 μm or less. When the widths are different, the width of color 1 is greater than 500 μm and the width of color 2 is 500 μm or less, etc.).

[0170] In addition, as described later, when one of the different colors (for example, color 1) is a pattern and the other (for example, color 2) is its background, etc., there are cases where it is impossible to clearly define the width of the color, or the width of the other is very large compared to the width of one of the colors. At this time, from the perspective of easily affecting the visibility of the width and gap of any clear color (for example, color 1), the width of the smaller color (for example, color 1) or the width of the color constituting the pattern can be used (which can be used and variously adjusted). In addition, when the width of the color changes (for example, when the width of the pattern is not constant, when the color is the background, etc.), the narrowest width can be used as the width of the color.

[0171] In the second form of the multicolor printing section, the width of the gap (the space between different colors) in the direction of different colors can be selected, for example, in a range of about 2000 μm or less, can be 1500 μm or less, preferably 1000 μm or less, more preferably about 800 μm or less (for example, 700 μm or less), and can also be 600 μm or less (for example, 500 μm or less, 400 μm

[0172] or less, 350 μm or less).

[0173] The lower limit value of the width of the gap can be, for example, 3 μm, 5 μm, 7 μm, 10 μm, 15 μm, 20 μm, 30 μm, 50 μm, etc.

[0174] As the specific width of the gap, for example, 3 to 2000 μm, 10 to 1000 μm, 20 to 500 μm, 30 to 400 μm, 50 to 300 μm, 100 to 200 μm, etc. can be cited.

[0175] It is preferred that the width of the gap is not too large because when the width of the gap is too large, the presence or absence of the gap is conspicuous.

[0176] On the other hand, in order not to make the gap conspicuous, it is considered that the closer the width of the gap is to 0, the better. However, in order to print in such a way that the gap is substantially unrecognizable as in the first form in all of the multiple multicolor printing sections, complicated printing settings must be made, and there is a possibility of color mixing (bleeding) in a part of the multicolor printing sections. In addition, even if the width of the gap is a small finite value, the presence of the gap may not be conspicuous (for example, at least when observed with the naked eye, it is almost impossible to confirm the presence or absence of the gap). Therefore, it is realistic that the width of the gap is a finite value within a range that is not too large.

[0177] In addition, the width of the gap can be the same as or different from the width of the gap set during printing (corresponding to the set gap described later). For example, in the printing setting, even if printing is performed in such a way that a gap is generated with a specified width X, the color ink will slightly spread between different colors, so the width of the gap in the multicolor printing section may be less than X.

[0178] In the case where the width is reduced in this way, the width of the gap in the different-color printing section (the gap that can be actually confirmed in the printing substrate) varies depending on the actually set width, the width of the color, etc. For example, when the width of the gap set during printing is set to 1, the width of the gap in the different-color printing section can be 0.99 or less, 0.98 or less, 0.97 or less, 0.96 or less, 0.95 or less, 0.9 or less, 0.85 or less, 0.8 or less, 0.75 or less, 0.7 or less, 0.65 or less, 0.6 or less, 0.55 or less, 0.5 or less, etc. The lower limit value can be, for example, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, etc.

[0179] When the width of the gap set during printing is set to 1, as the width of the gap in the specific different-color printing section, for example, 0.1 - 0.99, 0.2 - 0.98, 0.3 - 0.97, 0.4 - 0.96, etc. can be cited.

[0180] The size of the gap in the different-color printing section can be selected according to the width of different colors or the printing resolution.

[0181] For example, when different colors are set as Color 1 and Color 2, and the width of Color 1 or the width of Color 2 (for example, the width of the smaller one of them, the width of the color forming the pattern) is set to A (μm), and the width of the gap is set to B (μm), the value of B / A can be selected from a range of about 10 or less (for example, 9.5 or less, 9 or less), can be 8 or less (for example, 7.5 or less), preferably 7 or less (for example, 6 or less), more preferably 5 or less (for example, 4 or less), especially can be about 3 or less (for example, 2.5 or less), and can also be 2 or less (for example, 1 or less, 0.8 or less, 0.5 or less, 0.3 or less, 0.1 or less), etc.

[0182] As the lower limit value of the value of B / A, for example, 0.005, 0.01, 0.015, 0.02, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, etc. can be cited.

[0183] As specific B / A, for example, 0.005 - 7, 0.01 - 5, 0.15 - 3, 0.2 - 2, etc. can be cited.

[0184] The conspicuousness of the gap is also affected by the width of the color (when the widths of different colors are different, the width of the smaller (narrower) one). If it is within the above range, the conspicuousness of the gap can be suppressed, and at the same time, bleeding can be effectively suppressed.

[0185] In addition, when the printing resolution is set to X (dpi) and the number of pixels corresponding to the width of the gap is set to Y, the value of X / Y [dpi / number (number of pixels)] of the width of the gap can be, for example, around 20 to 800 (for example, 22 to 700, 25 to 650, 28 to 600, 30 to 550, 40 to 500, around 45 to 450).

[0186] For example, when the resolution is 600 dpi and the number of pixels corresponding to the width of the gap is 2 pixels, the width of the gap is 2 pixels [about 85 μm (2.54 cm ÷ 600 × 2)], and the value of X / Y is 300, within the range of the above X / Y value (20 to 800).

[0187] The visibility of the gap is also affected by the resolution. As described above, by setting the gap in association with the resolution, it is possible to suppress the visibility of the gap and effectively suppress bleeding at the same time.

[0188] In addition, the above value of X / Y can be selected according to the width of different colors.

[0189] For example, in the different-color printing section, when the width of color 1 or the width of color 2 (for example, the width of the smaller one of them, the width of the color forming the pattern) is a smaller width (for example, 500 μm or less, 300 μm or less, 200 μm or less), the value of X / Y may not be made too small (for example, make it 50 or more, 80 or more, 100 or more, 120 or more, greater than 120, 125 or more, etc.).

[0190] On the other hand, in the different-color printing section, when the width of color 1 or the width of color 2 (for example, the width of the smaller one of them, the width of the color forming the pattern) is a larger width (for example, greater than 500 μm, 600 μm or more), the value of X / Y may not be made too large (for example, make it 200 or less, 150 or less, 120 or less).

[0191] By selecting the value of X / Y according to the width of the color in this way, it is easier to further effectively suppress the visibility of the gap.

[0192] The printing section (different-color printing section) can be a solid color or can have (formed with) a pattern.

[0193] The pattern is not particularly limited and can be selected according to the use of the substrate (printing substrate), its display purpose, etc. For example, characters (for example, hiragana, katakana, Chinese characters, letters, etc.), numbers (for example, Arabic numerals, Roman numerals, etc.), graphics, etc. can be cited.

[0194] The graphics can be in the form of patterns such as barcodes, two-dimensional codes, etc. (graphic patterns).

[0195] However, since it is difficult to recognize or impossible to recognize (difficult to read or impossible to read) the bar code whether bleeding occurs or the gap becomes too large, it is difficult to print a recognizable bar code.

[0196] However, as described above, in the present invention, by using a specific index to adjust the width of the gap, etc., it is possible to effectively print (record) a recognizable (readable) bar code.

[0197] In addition, whether the bar code can be recognized (read) can be confirmed by a bar code reader (for example, the method described later).

[0198] As a specific form of the different-color printing portion, for example, it is possible to list the forms in which, among different colors 1 and 2, (i) color 1 is a pattern and color 2 is its background; (ii) a pattern is formed by combining color 1 and color 2 (for example, a striped form in which color 1 and color 2 are alternately adjacent, a form in which color 1 is a wave pattern and color 2 is a wave pattern along the wave pattern of color 1), etc. In a representative different-color printing portion, the different-color printing portion of (i) can be listed.

[0199] As described above, the printing portion may have one or two or more different-color printing portions, and in particular, may have two or more (a plurality of) different-color printing portions.

[0200] When there are a plurality of different-color printing portions, the plurality of different-color printing portions may be the same different-color printing portion or different different-color printing portions (for example, different different-color printing portions selected from at least one of the type of color, the combination of colors, the width of the color, the width of the gap, the pattern, etc.).

[0201] For example, a plurality of different-color printing portions may be combined with a different-color printing portion having a larger width (for example, greater than 500 μm) and a different-color printing portion having a smaller width (for example, 500 μm or less). For convenience, if the printing portion has two different different-color printing portions, and these two different-color printing portions are respectively set as different-color printing portion 1 and different-color printing portion 2 and specific examples are described, then it is possible to list the case where the width of at least one of the different colors constituting different-color printing portion 1 (for example, the width of any one of the smaller ones, the width of the color forming the pattern) is greater than 500 μm, and the width of at least one of the different colors constituting different-color printing portion 2 (for example, the width of any one of the smaller ones, the width of the color forming the pattern) is 500 μm or less.

[0202] As described above, since the visibility (the degree of inconspicuousness of the gap) of the different-color printing portion of the second form can be adjusted according to the width of the color, even if a different-color printing portion having a color with a larger width and a different-color printing portion having a color with a smaller width are combined in this way, it is possible to effectively form a plurality of visible different-color printing portions on the entire printing substrate (overall).

[0203] In most cases, multiple different-color printing portions generally at least include different different-color printing portions. Among such different different-color printing portions, in order to effectively suppress color bleeding overall and at the same time not make the gaps conspicuous, it is preferable to select the gaps of the respective different-color printing portions based on a specific index (such as the width or resolution of the color) (select according to the different-color printing portions).

[0204] In addition, the printing portion only needs to have at least different-color printing portions (especially multiple different different-color printing portions), and may also have non-different-color printing portions (for example, a plain-color printing portion (a plain color with only one color), a printing portion with a pattern of one color).

[0205] [Manufacturing method]

[0206] The printed substrate is obtained by forming (recording) a printing portion on the substrate.

[0207] Among them, in the present invention, when printing different-color printing portions (printing portions printed with different colors adjacent to each other) in the printing portion, printing is performed in such a way as to create a gap between different colors (or in such a way as to set a gap between different colors).

[0208] By performing printing in this way, the above-described printed substrate can be effectively obtained. That is, bleeding in the different-color printing portions can be suppressed or prevented. Therefore, such a method can also be referred to as a method for suppressing or preventing bleeding in different-color printing portions.

[0209] In addition, as described above, even when printing is performed in such a way as to create a gap (set with a gap), there is a case where the inks of different colors slightly spread between each other's colors. In this case, if the size (width) of the gap is made the same as the size (width) of the spread, even if the inks of different colors approach and spread between each other's colors, bleeding will not occur, and a different-color printing portion (a different-color printing portion of the first form) where there is no apparent gap between different colors is formed.

[0210] The printing method is not limited, and in particular, it can be an inkjet method (inkjet mode).

[0211] In the inkjet method, examples of the inkjet mode include a continuous type, a demand type (for example, a piezoelectric type, a thermal bubble type, a valve type, etc.). A representative inkjet mode is the demand type (for example, the piezoelectric type).

[0212] In addition, the printing device can be selected according to the printing method. For example, an inkjet printer can be used in the inkjet method.

[0213] When using transparent ink simultaneously, a print head having an ink chamber for ejecting color ink and an ink chamber for ejecting transparent ink can also be used.

[0214] In addition, printing (such as ink ejection) can be performed while transporting the substrate.

[0215] At this time, the transport speed can be appropriately selected according to the type of the substrate, etc. For example, it can be 1 to 20 m / minute (for example, 2 to 15 m / minute, 3 to 12 m / minute), etc.

[0216] In printing (inkjet), the form of the ink, resolution, etc. is as described above.

[0217] The ejection amount of the ink can be, for example, 1 pL or more (for example, 3 pL or more) per 1 drop (dot), preferably 5 pL or more (for example, 7 pL or more), and more preferably about 8 pL or more (for example, 9 pL or more).

[0218] The upper limit value of the ejection amount of the ink can be, for example, 50 pL, 30 pL, 20 pL, 15 pL, etc. per 1 drop (dot).

[0219] In addition, such an ejection amount can be applied to both color ink and transparent ink.

[0220] Especially when using transparent ink simultaneously, when the ejection amount of the color ink is set to 1, the total amount of the ejection amounts of the color ink and the transparent ink [ejection amount per 1 drop (1 dot)] can be 1.1 or more, preferably 1.3 or more, and more preferably 1.5 or more (for example, 1.8 or more, etc.), and can be 10 or less, 8 or less, 5 or less, 3 or less, etc.

[0221] Thus, when using transparent ink simultaneously, compared with when using only color ink, the ejection amount (and the amount of solvent in the printing section) increases. However, even if the amount of solvent increases in this way, bleeding can be effectively suppressed by performing printing with a set gap.

[0222] The ejection of the ink can be performed simultaneously with the scanning (movement) of the printer carriage (the printer carriage having the head). At this time, the scanning direction can be, for example, a direction perpendicular to the transport direction of the substrate. The scanning speed can be, for example, 30 m / minute or more (for example, 40 to 500 m / minute), preferably 50 m / minute or more (for example, 80 to 300 m / minute), and more preferably about 100 m / minute or more (for example, 120 to 200 m / minute).

[0223] As described above, when printing the different-color printing section, printing is performed in such a way as to create a gap between different colors (printing is performed after setting the printing apparatus). The form of the gap is as described above, and the gap (sometimes referred to as a set gap or the like) set during such printing may also be the same as described above.

[0224] For example, the width of the gap (set gap, hereinafter the same applies to the gap set during printing) can be selected from a range of about 2000 μm or less, can be 1500 μm or less, preferably 1000 μm or less, more preferably 800 μm or less (for example, 700 μm or less) or so, and printing can be performed in such a way that the width of the gap is 600 μm or less (for example, 500 μm or less, 400 μm or less, 350 μm or less).

[0225] The lower limit value of the width of the set gap can be, for example, 3 μm, 5 μm, 7 μm, 10 μm, 15 μm, 20 μm, 30 μm, 50 μm, etc.

[0226] As the specific width of the set gap, for example, 3 to 2000 μm, 10 to 1000 μm, 20 to 500 μm, 30 to 400 μm, 50 to 300 μm, 100 to 200 μm, etc. can be cited.

[0227] In addition, as described above, due to the diffusion of the ink or the like, there are cases where the gap of the formed different-color printing section [(sometimes also referred to as the actual gap, etc. with respect to the set gap)] is smaller than the set gap.

[0228] Therefore, the width of the set gap can be the same as the width of the actual gap, or can be greater than the width of the actual gap (required gap). When making it greater than the width of the actual gap (required gap) in this way, the degree can be selected according to the assumed ink diffusion or the required gap width, etc., and there is no particular limitation.

[0229] At this time, the width of the set gap can be, for example, 1 μm or more greater than the width of the actual gap [for example, 1.5 μm or more (for example, 2 to 300 μm), 2.5 μm or more (for example, 3 to 250 μm), 3.5 μm or more (for example, 4 to 200 μm), 4.5 μm or more (for example, 5 to 150 μm)] or so.

[0230] In addition, the width of the set gap can be set to be more than 1 time the width of the actual gap [for example, 1.001 times or more (e.g., 1.005 times or more), 1.01 times or more (e.g., 1.02 times or more), 1.05 times or more (e.g., 1.07 times or more), 1.08 times or more, 1.1 times or more, etc.], and can be set to be 5 times or less the width of the actual gap (e.g., 4 times or less, 3.5 times or less, 3 times or less, 2.5 times or less, 2 times or less, 1.8 times or less, 1.5 times or less, 1.3 times or less, 1.2 times or less, 1.1 times or less, 1.05 times or less, etc.).

[0231] The size of the gap can also be selected according to the width of different colors or the printing resolution as described above.

[0232] For example, when different colors are set to Color 1 and Color 2, and the width of Color 1 or the width of Color 2 (e.g., the width of the smaller one of them, the width of the color forming the pattern) is set to A (μm), and the width of the gap is set to B (μm), the value of B / A can be selected from a range of about 10 or less (e.g., 9.5 or less, 9 or less), can be 8 or less (e.g., 7.5 or less), preferably 7 or less (e.g., 6 or less), more preferably 5 or less (e.g., 4 or less), and particularly can be about 3 or less (e.g., 2.5 or less), and can also be set to 2 or less (e.g., 1 or less, 0.8 or less, 0.5 or less, 0.3 or less, 0.1 or less), etc.

[0233] As the lower limit value of the value of B / A, for example, 0.005, 0.01, 0.015, 0.02, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, etc. can be cited.

[0234] As specific B / A, for example, 0.005 - 7, 0.01 - 5, 0.15 - 3, 0.2 - 2, etc. can be cited.

[0235] In addition, when the printing resolution is set to X (dpi) and the number of pixels corresponding to the width of the gap is set to Y, the width of the gap can be adjusted, for example, in such a way that the value of X / Y [dpi / number (number of pixels)] is about 20 - 800 (e.g., 22 - 700, 25 - 650, 28 - 600, 30 - 550, 40 - 500, 45 - 450 or so).

[0236] Furthermore, such a value of X / Y can be selected according to the width of different colors.

[0237] For example, when the width of Color 1 or the width of Color 2 (e.g., the width of the smaller one of them, the width of the color forming the pattern) is a smaller width (e.g., 500 μm or less, 300 μm or less, 200 μm or less), the value of X / Y can be prevented from being too small (e.g., 50 or more, 80 or more, 100 or more, 120 or more, greater than 120, 125 or more, etc.).

[0238] On the other hand, when the width of Color 1 or the width of Color 2 (e.g., the width of the smaller one of them, the width of the color forming the pattern) is a larger width (e.g., greater than 500 μm, 600 μm or more), the value of X / Y can be prevented from being too large (e.g., 200 or less, 150 or less, 120 or less).

[0239] In this way, by selecting (adjusting) the setting method of the gap according to conditions such as the width or resolution of the color, it is possible to suppress bleeding between colors in the different-color printing portion, and at the same time, it is possible to effectively form a natural different-color printing portion in which the gap is not easily noticeable.

[0240] In addition, as described above, the above printing conditions (such as the gap form) can be reflected in the printing portion (different-color printing portion) in exactly the same form, or can be reflected in the printing portion (different-color printing portion) in different forms.

[0241] For example, printing can be performed by an inkjet method, dots in the printing portion can collapse and deform, and the width of the gap in the different-color printing portion can be smaller than the width of the gap set at the time of printing.

[0242] As described above, if at least any one of the inks of different colors (especially two inks) diffuses between each other's colors, the width of the color set at the time of printing [e.g., the width (length) corresponding to the number of pixels] will become larger in the printing portion, which results in the actual gap being smaller than the set gap.

[0243] At this time, when the width of the color set at the time of printing (hereinafter, sometimes also referred to as the set color width, etc.) is set as C1, and the width of the color in the different-color printing portion [hereinafter, sometimes also referred to as the actual color width, etc. (relative to the set color width)] is set as C2, the difference between the two [C2 (actual color width C2) - C1 (set color width C1)] can be, for example, 0.5 μm or more (e.g., 0.8 μm or more, 1 μm or more, 1.5 μm or more, 2 μm or more, 2.5 μm or more, 3 μm or more, 3.5 μm or more, 4 μm or more, 4.5 μm or more, 5 μm or more, etc.), and can be 300 μm or less (e.g., 280 μm or less, 250 μm or less, 200 μm or less, 180 μm or less, 150 μm or less, 120 μm or less, 100 μm or less, 80 μm or less, 70 μm or less, 50 μm or less, etc.).

[0244] After printing, heat treatment (drying treatment) can be performed as needed. Through the heat treatment, the solvent can be removed from the printing section. In addition, when the ink contains a crosslinking agent, crosslinking can be performed while heating (drying).

[0245] [Uses of the printing substrate, etc.]

[0246] The printing substrate can be directly used for various purposes according to the type or form of the substrate, and can also be further formed (processed) as needed to obtain the required formed product.

[0247] For example, a printing substrate with a plastic film (such as a blown film) can be formed into a flexible bag (medical flexible bag) through processes such as heat welding, cutting, and hole (filling port for the content) installation processes.

[0248] Then, the flexible bag can be made into a flexible bag with contents (infusion bag) through processes such as filling the contents (such as infusion), autoclaving (high-pressure shower sterilization), etc.

[0249] Thus, since various loads are applied to the printing substrate during the post-printing forming process, if the printing section (colored printing section) is not sufficiently fixed (recorded), there is a risk of peeling.

[0250] For example, in the example of processing into the infusion bag, the printing section (colored printing section) becomes prone to peeling due to autoclaving treatment, etc.

[0251] In addition, if the fixing of the printing section is insufficient, it is prone to peeling due to contact with drugs (such as alcohols like ethanol).

[0252] To effectively prevent such peeling, as described above, although it is appropriate to use transparent ink at the same time to make the resin amount of the printing section (colored printing section) sufficient, etc., on the other hand, if transparent ink is used, there is a tendency for bleeding (color mixing) between the colors of the colored printing section and for the visibility or appearance loss of the printing section to become significant.

[0253] However, as described above, according to the present invention, even if transparent ink is used, bleeding of the colored printing section can be effectively suppressed, and it is possible to effectively balance the firm printing (recording) required for medical flexible bags, etc. (such as having scratch resistance, excellent adhesion, chemical resistance, etc.) and the suppression of bleeding (and the inconspicuousness of gaps).

[0254] Examples

[0255] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by the examples.

[0256] In addition, the materials used are as described below.

[0257] Ink (color ink and transparent ink)

[0258] Ink 1 to 4 and 8 described in the examples of Japanese Unexamined Patent Application Publication No. 2020-19180 are produced and used as color inks. In addition, Ink 9 described in the examples of Japanese Unexamined Patent Application Publication No. 2020-19180 is produced and used as a transparent ink.

[0259] The composition of each ink and the like are as described below. In the following table, "parts" means parts by mass.

[0260] [Table 1]

[0261]

[0262] <Antifoaming agent>

[0263] · DF110D: Trade name "Surfynol DF110D", an acetylene glycol surfactant, manufactured by Nissin Chemical co.,ltd.

[0264] <Surfactant>

[0265] · BYK348: Trade name, a silicone surfactant, manufactured by BYK Japan KK.

[0266] <Pigment>

[0267] · Black pigment: Carbon black

[0268] · Cyan pigment: C.I. Pigment Blue 15:3

[0269] · Magenta pigment: C.I. Pigment Red 122

[0270] · Yellow pigment: C.I. Pigment Yellow 150

[0271] · White pigment: C.I. Pigment White 6

[0272] <Resin>

[0273] · JONCRYL 62J (Trade name, a styrene acrylic resin, manufactured by BASF Japan Ltd.)

[0274] · AQUACER539 (Trade name, an aqueous modified paraffin emulsion, manufactured by BYK Japan KK.)

[0275] In addition, various measurements and analyses are carried out as follows.

[0276] Viscosity

[0277] Using a rheometer (trade name "MCR300", manufactured by Anton Paar GmbH), at a measurement temperature of 32 °C and a shear rate of 200 s -1 Measurements were carried out.

[0278] Wetting tension

[0279] As a wetting reagent, a wetting tension test mixture (manufactured by FUJIFILM Wako Pure Chemical Corporation, etc.) was used. A cotton swab was dipped in the wetting tension test mixture of No35, and the liquid adhering to the cotton swab was applied to the printed material. When it was wetted for 2 seconds, it was regarded as having a wetting tension of this value.

[0280] A new cotton swab was dipped in the wetting tension test mixture of No45, and the same operation was carried out. Since repulsion occurred within 2 seconds, it was regarded as having a wetting tension of 45 or less. It was regarded as having a value of the wetting tension of the printed material between 35 and 45. Using a liquid with an appropriate wetting tension value, the MAX value of wetting for 2 seconds was used as the wetting tension of the printed material.

[0281] Ability to recognize barcodes

[0282] The SR2000 manufactured by KEYENCE CORPORATION was placed about 20 cm above the printing substrate (barcode part), and photography and reading were carried out. In addition, the SR2000 was adjusted so that the calibration value (modulation·decodability·defect) obtained by the calibration machine for the calibration sheet was the closest. When the modulation was 25% or more, the decodability was 37% or more, and the defect was less than 30%, it was considered recognizable.

[0283] Visual judgment

[0284] Visual observation was carried out from a distance of approximately 40 cm, and bleeding and gaps were judged according to the following criteria respectively.

[0285] A: Completely unrecognizable.

[0286] B: Almost unrecognizable.

[0287] C: Recognizable, but not prominent.

[0288] D: Prominent and recognizable.

[0289] Thirty people were used for the marking determination, and the most determinations were taken as the visual determination result.

[0290] [Example 1]

[0291] (Manufacture of printing substrate)

[0292] For a film that removes the air from the inner surface of a blown tubular film (a laminated film of polybutylene terephthalate and an olefin resin) and winds it up, with the printing surface (the surface of polybutylene terephthalate in the laminated film (wetting tension is 38 dyn / cm)) facing upward, a plain transparent ribbon film is sent from a roll feed roller to a buffer roller, and while being transported, a printing portion is formed by an inkjet method.

[0293] That is, the tubular film is a film intended for a medical soft bag. Under the conditions shown in the following table, ink is ejected in such a way as to form a plurality of differently colored printing portions on the film for printing.

[0294] [Table 2]

[0295]

[0296] In addition, the colors (patterns and their backgrounds) of the differently colored printing portions are all printed along the transverse direction of the film (that is, the arrangement directions of the lines of "sugar + electrolyte solution (maintenance solution)" in the differently colored printing portion 1, "infusion solution" in the differently colored printing portion 2, "1000 mL" in the differently colored printing portion 3, and the bar code lines in the differently colored printing portion 4 are all in the transverse direction of the film).

[0297] In addition, the ink ejection head of the inkjet device moves perpendicular (i.e., transversely) to the film traveling direction (longitudinal direction, film transport speed is 8 m / minute) (head scanning speed is 152 m / minute). At this time, ink is ejected from the nozzle. Then, ink is ejected on the forward path and the return path of the movement of the ink ejection head. After ejecting color ink on the forward path, transparent ink is immediately (almost simultaneously) ejected. After ejecting transparent ink on the return path, color ink is immediately coated. This is determined by the structure of the ejection head because the nozzles are arranged in the order of the nozzle for ejecting color ink and the nozzle for ejecting transparent ink in the traveling direction of the forward path.

[0298] In addition, the transparent ink is ejected onto the color ink ejection portion (pre-ejection portion on the return path), rather than being sprayed onto the entire film (transparent ink is not sprayed on the portions where color ink is not ejected).

[0299] Furthermore, while hot air is blown onto the film after ink ejection and the film is transported, the printing surface is dried to obtain the target product (a film having a printing portion including a plurality of differently colored printing portions).

[0300] (Evaluation of printing substrate)

[0301] Differently colored printing section 1

[0302] For the discolored printing section 1 in the obtained film, a close-up photo is shown in Figure 1 , and a micrograph (20× magnification, black background) is shown in Figure 2 .

[0303] The discolored printing section 1 sets characters with a small width (i.e., the width of each character of the character string “sugar electrolyte solution (maintenance solution)”) to color 1. Visually, no bleeding was observed between color 1 and its background (judgment A), and no gap was confirmed either (judgment A). From what can be called an extremely close distance Figure 1 , an enlarged photo of Figure 2 also shows this situation.

[0304] In addition, as described above, in the discolored printing section 1, although the gap set during printing is completely unobtrusive, when observed in a micrograph at a higher magnification, the existence of a gap (the gap between the character string and its background) can be slightly confirmed [about 78 μm in the longitudinal direction (about 0.92 times (1.8 pixels) of the gap set during printing), width 1 (350 μm), width 2 (175 μm), width B / width 1 = 0.22, width B / width 2 = 0.45, X / Y = 333), about 42 μm in the transverse direction (about 0.50 times (0.99 pixels) of the gap set during printing), width 1 (350 μm), width 2 (175 μm), width B / width 1 = 0.12, width B / width 2 = 0.24, X / Y = 606)].

[0305] Since color 1 is white, it is suggested that being white in color is also related to the unobtrusiveness of the gap.

[0306] Differently colored printing section 2

[0307] Similarly, a close-up photo of the discolored printing section 2 is shown in Figure 3 , and a micrograph (20× magnification, black background) is shown in Figure 4 .

[0308] The discolored printing section 2 sets characters with a medium width (i.e., the width of each character of the character string “infusion”) to color 1. Visually, no bleeding was observed between color 1 and its background (judgment A), and almost no gap was confirmed either (judgment B). That is, even in the case of an extremely close-up photo Figure 3 , no clear gap can be confirmed between color 1 (the character string) and the background, and a clear gap can only be confirmed through the enlarged photo Figure 4 to that extent.

[0309] In addition, as described above, in the different-color printing section 2, the gap set during printing can hardly be confirmed visually, but the existence of the gap was confirmed by microscopic observation [approximately 159 μm in the vertical direction (approximately 0.94 times the gap set during printing (3.8 pixels), width 1 (1636 μm), width 2 (630 μm), width B / width 1 = 0.097, width B / width 2 = 0.25, X / Y = 158), approximately 116 μm in the horizontal direction (0.69 times the gap set during printing (2.7 pixels), width 1 (1636 μm), width 2 (630 μm), width B / width 1 = 0.071, width B / width 2 = 0.18, X / Y = 222)].

[0310] Differently colored printing section 3

[0311] Similarly, a close-up photo of the different color printing unit 3 is shown in FIG. Figure 5 , the microscope photo (20 times, white background) is shown in Figure 6 .

[0312] The different-color printing unit 3 sets the characters with a larger width (i.e., the width of each character (number, Latin letter) in the character string "1000mL") as color 1. Visually, no bleeding is observed between color 1 and its background (judgment A), and almost no gap is confirmed (judgment B). That is, in the extremely close-up photo, Figure 5 In the image, a small gap can be seen between Color 1 (text string) and the background. Figure 6 Only then can a clear gap be confirmed.

[0313] In addition, as described above, in the different-color printing section 3, the gap set during printing could hardly be confirmed visually, but the existence of the gap was confirmed by microscopic observation [approximately 226 μm in the vertical direction (approximately 0.89 times the gap set during printing (5.3 pixels), width 1 (2388 μm), width 2 (2802 μm), width B / width 1 = 0.095, width B / width 2 = 0.081, X / Y = 113), approximately 144 μm in the horizontal direction (0.57 times the gap set during printing (3.4 pixels), width 1 (2388 μm), width 2 (2802 μm), width B / width 1 = 0.060, width B / width 2 = 0.051, X / Y = 176)].

[0314] Differently colored printing section 4

[0315] For the different-color printing section 4 (barcode), visually, no bleeding was observed between color 1 (the lines of the barcode) and its background (judgment A), and no gap was confirmed either (judgment A). It is considered that the failure to visually confirm the gap is also related to the background color being white.

[0316] Through the above method, it was confirmed whether the different-color printing section 4 could be recognized in the form of a barcode, and the result was that it could be recognized.

[0317] In addition, enlarged photos of the different-color printing section 4 were also taken and observed, and the existence of a gap was confirmed [longitudinally about 154 μm (about 0.91 times the gap set during printing (3.6 pixels)), width 1 (367 μm), width 2 (350 μm), width B / width 1 = 0.42, width B / width 2 = 0.44, X / Y = 167), and transversely about 118 μm (about 0.7 times the gap set during printing (2.8 pixels)), width 1 (367 μm), width 2 (350 μm), width B / width 1 = 0.32, width B / width 2 = 0.34, X / Y = 214)].

[0318] (Forming and Evaluation of Infusion Bags)

[0319] For the printed film obtained, the four sides that become the infusion bag were heat-sealed (but the hole installation positions were not heat-sealed). After the heat-sealing process, it was cut into an infusion bag, and resin-made holes were installed at the hole installation positions by heat-sealing.

[0320] Then, after the hole installation process, the content (infusion) was filled from the holes, a rubber stopper was installed in the holes, and after a protective film was attached to the holes by heat-sealing to protect the rubber stopper, high-pressure shower sterilization was performed to obtain an infusion bag.

[0321] In addition, the processes up to high-pressure shower sterilization were carried out inline on the production line.

[0322] During the forming process of the infusion bag, no peeling of the different-color printing sections 1 to 4 occurred.

[0323] In addition, for the infusion bag after high-pressure shower sterilization, the different-color printing sections 1 to 4 were strongly rubbed with fingers, but no peeling occurred.

[0324] Furthermore, a cloth impregnated with ethanol was used to wipe the different-color printing sections 1 to 4, but no peeling occurred either.

[0325] In this way, it was confirmed that the different-color printing sections 1 to 4 were firmly printed on the infusion bag.

[0326] [Reference Example 1]

[0327] Except for printing in the same manner as in Example 1 without setting a gap between the different-color printing portions (Color 1 and Color 2 (background)) during printing, a printed substrate was obtained.

[0328] In the obtained film, bleeding (judgment D) was clearly confirmed between Color 1 and its background in all of the different-color printing portions 1 to 4 at the visual inspection stage.

[0329] [Reference Example 2]

[0330] Except for printing in the same manner as in Example 1 without using transparent ink and without setting a gap between the different-color printing portions (Color 1 and Color 2 (background)), a printed substrate was obtained.

[0331] Bleeding was observed between the colors in all of the different-color printing portions 1 to 4 at the time of visual inspection, but it was slightly less than that in Reference Example 1 (judgment C).

[0332] Furthermore, using the printed substrate, an infusion bag was molded in the same manner as in Example 1. As a result, peeling was observed at multiple locations in the different-color printing portions 1 to 4. And when wiped with a cloth impregnated with ethanol, almost all of the different-color printing portions peeled off.

[0333] [Example 2]

[0334] Except for changing the width of the longitudinal gap of the different-color printing portion 1 in Example 1 to the values shown in the following table, printed substrates were obtained in the same manner as in Example 1 for each gap width.

[0335] Then, for the different-color printing portion 1 of each of the obtained printed substrates, evaluation was performed visually in the same manner as in Example 1. The results are shown in the following table.

[0336] [Table 3]

[0337]

[0338] [Example 3]

[0339] Except for changing the width of the lateral gap of the different-color printing portion 3 in Example 1 to the values shown in the following table, printed substrates were obtained in the same manner as in Example 1 for each gap width.

[0340] Then, for the different-color printing portion 3 of each of the obtained printed substrates, evaluation was performed visually in the same manner as in Example 1. The results are shown in the following table.

[0341] [Table 4]

[0342]

[0343] As can be seen from the results of the above table, for colors with a larger width, even if a slightly larger gap width is taken, it is possible to form a different-color printing portion where the gap is not eye-catching by adjusting the X / Y values.

[0344] [Example 4]

[0345] Except that in Example 1, a single-layer film of polyethylene (the wetting tension of the printing surface is 35 dyn / cm) was used as the tubular film, a printed substrate was obtained in the same manner as in Example 1.

[0346] The obtained film showed the same tendency as in Example 1 in the different-color printing portions 1 to 4, the molding of the infusion bag, and its evaluation.

[0347] [Example 5]

[0348] Except that in Example 1, a single-layer film of a mixed resin of polyethylene and polypropylene (the wetting tension of the printing surface is 45 dyn / cm) was used as the tubular film, a printed substrate was obtained in the same manner as in Example 1.

[0349] The obtained film showed the same tendency as in Example 1 in the different-color printing portions 1 to 4, the molding of the infusion bag, and its evaluation.

[0350] [Example 6]

[0351] Prepare the ink of Example 1 of Japanese Patent Laid-Open No. 2018-141066.

[0352] Then, use the obtained ink (cyan) to replace Ink 2, and except for this, a printed substrate was obtained in the same manner as in Example 1.

[0353] The obtained film showed the same tendency as in Example 1 in the different-color printing portions 1 to 4 (especially different-color printing portions 2 and 4), the molding of the infusion bag, and its evaluation.

[0354] [Example 7]

[0355] Except that Ink 1 to 4 were used to replace the inks manufactured by Roland DG Corporation, black (FPG-BK), cyan (FPG-CY), magenta (FPG-MG), and yellow (FPG-YE) respectively, a printed substrate was obtained in the same manner as in Example 1.

[0356] The obtained film showed the same tendency as in Example 1 in the different-color printing portions 1 to 4, the molding of the infusion bag, and its evaluation.

[0357] [Example 8]

[0358] A printed substrate was obtained in the same manner as in Example 1, except that the vertical resolution was changed to 400 dpi in Example 1.

[0359] The obtained film showed the same tendency as in Example 1 in the multicolor printing sections 1 to 4, the molding of the infusion bag, and its evaluation.

[0360] [Example 9]

[0361] A printed substrate was obtained in the same manner as in Example 1, except that the horizontal resolution was changed to 200 dpi in Example 1.

[0362] The obtained film showed the same tendency as in Example 1 in the multicolor printing sections 1 to 4, the molding of the infusion bag, and its evaluation.

[0363] [Example 10]

[0364] A printed substrate was obtained in the same manner as in Example 1, except that the vertical resolution was changed to 300 dpi and the horizontal resolution was changed to 300 dpi in Example 1.

[0365] The obtained film showed the same tendency as in Example 1 in the multicolor printing sections 1 to 4, the molding of the infusion bag, and its evaluation.

[0366] Industrial Applicability

[0367] According to the present invention, a novel printed substrate, a method for manufacturing the same, etc. can be provided.

Claims

1. A printed substrate, wherein the printed substrate has a printed portion on the substrate, wherein, the printed portion includes a different-color printed portion printed with different colors at intervals, and the wetting tension of the printed surface of the substrate is 30 to 50 dyn / cm, the different-color printed portion includes the different-color printed portion 1 and / or the different-color printed portion 2 shown below: When different colors are set as color 1 and color 2, the width of color 1 or the width of color 2 is 500 μm or less, and when the printing resolution is set as X dpi and the number of pixels corresponding to the width of the interval is set as Y, the different-color printed portion 1 with X / Y being 20 to 300; The width of color 1 or the width of color 2 is greater than 500 μm, and the different-color printed portion 2 with X / Y being 200 or less.

2. A printed substrate, wherein the printed substrate has a printed portion on the substrate, wherein, the printed portion at least includes a different-color printed portion printed with different colors adjacent to each other without bleeding, and the wetting tension of the printed surface of the substrate is 30 to 50 dyn / cm, the different-color printed portion includes the different-color printed portion 1 and / or the different-color printed portion 2 shown below: When different colors are set as color 1 and color 2, the width of color 1 or the width of color 2 is 500 μm or less, and when the printing resolution is set as X dpi and the number of pixels corresponding to the width of the interval is set as Y, the different-color printed portion 1 with X / Y being 20 to 300; The width of color 1 or the width of color 2 is greater than 500 μm, and the different-color printed portion 2 with X / Y being 200 or less.

3. The printed substrate according to claim 1 or 2, wherein, the substrate is a plastic film.

4. The printed substrate according to claim 1 or 2, wherein, the printed surface of the substrate is composed of a polyester resin.

5. The printed substrate according to claim 1 or 2, wherein, the printed portion is printed by an inkjet method.

6. The printed substrate according to claim 1 or 2, wherein, the printed portion is formed of a water-based ink.

7. The printed substrate according to claim 1 or 2, wherein, the printed portion is formed of a color ink and a transparent ink.

8. The printed substrate according to claim 1 or 2, wherein, the printed portion is formed of a water-based color ink and a water-based transparent ink.

9. The printed substrate according to claim 1 or 2, wherein, the proportion of the resin in the printed portion relative to the total amount of the resin and the colorant is 20% by mass or more.

10. The printed substrate according to claim 1 or 2, wherein, the width of the interval is 10 to 1500 μm.

11. The printed substrate according to claim 1 or 2, wherein, the different-color printed portion includes: when different colors are set as color 1 and color 2, and the width of color 1 or the width of color 2 is set as A μm and the width of the interval is set as B μm, the different-color printed portion with the value of B / A being 8 or less.

12. The printed substrate according to claim 1 or 2, wherein, the different-color printed portion includes: when different colors are set as color 1 and color 2, the width of color 1 or the width of color 2 is 500 μm or less, and when the printing resolution is set as X dpi and the number of pixels corresponding to the width of the interval is set as Y, the different-color printed portion 1 with the value of X / Y being 50 to 300.

13. The printed substrate according to claim 12, wherein, in the different-color printing section 1, the width of color 1 or the width of color 2 is 400 μm or less, and the value of X / Y is 100 - 300.

14. The printed substrate according to claim 12, wherein, the different-color printing section further includes the following different-color printing section 2: a different-color printing section 2 in which the width of color 1 or the width of color 2 is greater than 500 μm and X / Y is 200 or less, or a different-color printing section 2 in which the width of color 1 or the width of color 2 is 600 μm or more and the value of X / Y is 150 or less.

15. The printed substrate according to claim 13, wherein, the different-color printing section further includes the following different-color printing section 2: a different-color printing section 2 in which the width of color 1 or the width of color 2 is greater than 500 μm and X / Y is 200 or less, or a different-color printing section 2 in which the width of color 1 or the width of color 2 is 600 μm or more and the value of X / Y is 150 or less.

16. The printed substrate according to claim 1 or 2, which includes a different-color printing section 2 in which the width of color 1 or the width of color 2 is 600 μm or more and the value of X / Y is 150 or less.

17. The printed substrate according to claim 1 or 2, wherein, the different-color printing section includes a different-color printing section in which any one of the different colors is white.

18. The printed substrate according to claim 1 or 2, wherein, the different-color printing section includes: a different-color printing section in which when different colors are set as color 1 and color 2, color 1 is a pattern and color 2 is a background.

19. The printed substrate according to claim 1 or 2, wherein, the different-color printing section includes: a different-color printing section in which when different colors are set as color 1 and color 2, color 1 is a bar code or a two-dimensional code and color 2 is a background, and which can be recognized in the form of a bar code or a two-dimensional code.

20. The printed substrate according to claim 1 or 2, wherein, the printed substrate is used to form a medical soft bag.

21. A method for manufacturing a printed substrate, which is a method for manufacturing the printed substrate according to any one of claims 1 - 20 by at least going through a printing process of printing a printing section on a substrate, wherein, in the printing process, the different-color printing section is printed in such a way that a gap is provided between different colors.

22. A method, which is a method for suppressing or preventing bleeding between different colors of a different-color printing section in a printed substrate having a printing section on a substrate with a wetting tension of 30 - 50 dyn / cm on the printing surface and the printing section including a different-color printing section in which different colors are printed adjacent to each other, wherein, in the printing process of printing the printing section on the substrate, the different-color printing section is printed in such a way that a gap is provided between different colors, and the different-color printing section is provided in such a way as to include the following different-color printing section 1 and / or different-color printing section 2: a different-color printing section 1 in which when different colors are set as color 1 and color 2, the width of color 1 or the width of color 2 is 500 μm or less, and when the printing resolution is set as X dpi and the number of pixels corresponding to the width of the gap is set as Y, X / Y is 20 - 300; An offset printing section 2 in which the width of color 1 or the width of color 2 is greater than 500 μm and X / Y is 200 or less.

23. The method according to claim 21 or 22, wherein, printing is performed by an inkjet method.

24. The method according to claim 21 or 22, wherein, in the printing process, printing is performed by ejecting color ink and transparent ink.

25. The method according to claim 21 or 22, wherein, printing is performed such that the width of the gap is 10 to 1500 μm.

26. The method according to claim 21 or 22, wherein, when different colors are set as color 1 and color 2, and the width of color 1 or the width of color 2 is set as A μm and the width of the gap is set as B μm, the gap is set such that the value of B / A is 8 or less.

27. A molded article, which is a molded article of the printing substrate according to any one of claims 1 to 20.

28. The molded article according to claim 27, wherein, the molded article is a medical soft bag.

Images