Inkjet recording system, inkjet recording method, processing liquid, and method for adjusting the position of the processing liquid discharge head.

Abstract

To provide an inkjet recording system that facilitates easy checking of the print pattern of treatment liquid and allows for image formation without adversely affecting image color due to the treatment liquid, and to provide an inkjet recording method, a treatment liquid, and a method for positioning a treatment liquid discharge head.SOLUTION: The present invention provides an inkjet recording system for image formation, which employs a treatment liquid containing a colorant with decolorizing properties.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an inkjet recording system, an inkjet recording method, a processing liquid, and a method for adjusting the position of a processing liquid ejection head. More specifically, the present invention relates to an inkjet recording system and the like that enable easy confirmation of a printing pattern of a processing liquid and formation of an image without adversely affecting the color of the image by the processing liquid.

Background Art

[0002] In image formation by an inkjet recording method, a technique using an ink (processing liquid) for pretreatment or overcoat together with a coloring ink is well known. The processing liquid is generally colorless so as not to adversely affect the color of the image. Such a colorless processing liquid makes it difficult to visually confirm the state of droplet loss or bending during the intermediate process from being ejected from the head to being attached to the recording medium. Further, even if a printing pattern of the processing liquid is printed for testing, it is difficult to perform head position adjustment because it cannot be evaluated by visual observation or observation with an ordinary camera.

[0003] As a method for visualizing a difficult-to-visualize ejection state of ink, a method using laser light scattering is known (see Patent Document 1). In the method (1), although it is possible to detect droplet loss or bending, it is impossible to visualize the ejection position, which causes difficulty in head position adjustment. Further, it is impossible to detect dripping of droplets onto the medium (recording medium), droplet adhesion due to medium attack on the head, and the like.

[0004] As methods for visualizing the ink ejection position, which is difficult to confirm visually, the following methods are known: (2) using a media such as water-sensitive paper that develops color when colorless ink lands, (3) replacing the ink in the print head with colored ink (see Patent Document 2), and (4) adding a fluorescent agent to colorless ink and visualizing it under ultraviolet irradiation (see Patent Document 3). With method (2), it is not possible to check the ejection position with normal media set, and the media replacement is troublesome. With method (3), there are problems such as the troublesome operation of replacing the ink and the fact that it cannot be used with processing liquids containing coagulants because it is mixed with colored ink. With method (4), a special visualization device such as an ultraviolet light source and an imaging device is required separately, and the fluorescent agent remains on the printed material, which is a problem. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-240119 [Patent Document 2] Japanese Patent Publication No. 2011-11432 [Patent Document 3] Japanese Patent Publication No. 2019-22949 [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention has been made in view of the above problems and circumstances, and its objective is to provide an inkjet recording system, an inkjet recording method, a processing liquid, and a method for adjusting the position of the processing liquid ejection head, which enable easy confirmation of the printing pattern of the processing liquid and enable the formation of an image without the processing liquid adversely affecting the color of the image. [Means for solving the problem]

[0007] In order to solve the above problems, the inventors investigated the causes of the above problems and found that by using a processing liquid containing a decolorizing colorant, it is possible to easily confirm the printing pattern of the processing liquid and to form an image without the processing liquid adversely affecting the color of the image, thus leading to the present invention. In other words, the above-mentioned problems according to the present invention are solved by the following means.

[0008] 1. An inkjet recording system for forming an image, A treatment solution containing a color-decolorizing agent is used. An inkjet recording system characterized by the following features.

[0009] 2. A processing liquid decolorization section is provided downstream of the processing liquid discharge section. The inkjet recording system according to the first paragraph, characterized in that...

[0010] 3. A drying section is provided downstream of the processing liquid discharge section, and this drying section also serves as a processing liquid decolorization section. The inkjet recording system according to the first paragraph, characterized in that...

[0011] 4. A processing liquid decolorization unit is provided downstream of the processing liquid discharge unit, and the processing liquid decolorization unit decolorizes the processing liquid by heating or electromagnetic wave irradiation. The inkjet recording system according to the first paragraph, characterized in that...

[0012] 5. Multiple types of the processing solution are used, and the color of the decolorizing colorant contained in each type of processing solution is different. The inkjet recording system according to the first paragraph, characterized in that...

[0013] 6. At least one of the processing liquids contains a coagulant. The inkjet recording system according to the first paragraph, characterized in that...

[0014] 7. At least one of the processing liquids contains a lubricant. The inkjet recording system according to the first paragraph, characterized in that...

[0015] 8. At least one of the treatment liquids contains a resin having a glass transition point of -10°C or higher. The inkjet recording system according to claim 1, characterized in that.

[0016] 9. At least one of the treatment liquids contains a penetration promoter. The inkjet recording system according to claim 1, characterized in that.

[0017] 10. A treatment liquid decoloring section is provided on the downstream side of the treatment liquid discharge section, and a non-decoloring drying section is provided between the treatment liquid discharge section and the treatment liquid decoloring section. The inkjet recording system according to claim 1, characterized in that.

[0018] 11. A treatment liquid decoloring section is provided on the downstream side of the treatment liquid discharge section, and the treatment liquid decoloring section decolorizes the treatment liquid by heating the surface temperature of the recording medium to 100°C or higher. The inkjet recording system according to claim 1, characterized in that.

[0019] 12. An inkjet recording method for forming an image, using a treatment liquid containing a decolorable coloring material. The inkjet recording method, characterized in that.

[0020] 13. A treatment liquid for inkjet recording, containing a decolorable coloring material. The treatment liquid, characterized in that.

[0021] 14. A method for adjusting the position of a treatment liquid discharge head for inkjet recording, adjusting the position of the treatment liquid discharge head based on the printing pattern of a treatment liquid containing a decolorable coloring material. The method for adjusting the position of the treatment liquid discharge head, characterized in that. <00​​​​ The above-described means of the present invention makes it possible to provide an inkjet recording system, etc., that allows for easy confirmation of the printing pattern of the processing liquid and enables the formation of an image without the processing liquid adversely affecting the color of the image.

[0023] The effects of the present invention are as follows in detail.

[0024] The processing liquid used in the inkjet recording system of the present invention is characterized by containing a decolorizing colorant. Since the decolorizing colorant is visible before decolorization, the processing liquid containing the decolorizing colorant makes it easy to check the print pattern, just like with ordinary coloring inks. This makes it easy to adjust the position of the print head. Furthermore, it is possible to check from the print pattern whether any droplets are missing or bent when the processing liquid is ejected. Therefore, by making it easy to check the print pattern, it also becomes easy to check for droplets missing or bent.

[0025] Furthermore, because the colorant contained in the processing solution according to the present invention is a decolorizing colorant, it can be visually confirmed when checking the printed pattern, while at the same time, it can be made colorless by applying decolorizing treatments such as heating or electromagnetic wave irradiation during image formation. Therefore, by using a processing solution containing a decolorizing colorant, it becomes possible to form an image without the processing solution adversely affecting the color of the image. [Brief explanation of the drawing]

[0026] [Figure 1] Schematic diagram of an example configuration of an inkjet recording system (1) [Figure 2] Schematic diagram of an example configuration of an inkjet recording system (6) [Figure 3] Schematic diagram of an example configuration of an inkjet recording system (9) [Figure 4] Schematic diagram of an example configuration of an inkjet recording system (12) [Figure 5] Schematic diagram of an example configuration of an inkjet recording system (19) [Figure 6] Schematic diagram of an example configuration of an inkjet recording system (21) [Figure 7] Schematic diagram of an example configuration (6) of an inkjet recording system for transporting roll-shaped recording media without using a conveyor belt. [Figure 8] Flowchart for adjusting the position of the processing liquid discharge head [Modes for carrying out the invention]

[0027] The present invention relates to an inkjet recording system that forms an image, characterized by using a processing solution containing a decolorizing agent. This feature is a technical feature common to or corresponding to the embodiments described below.

[0028] In an embodiment of the inkjet recording system of the present invention, it is preferable to provide a processing liquid decolorization unit downstream of the processing liquid discharge unit. This allows the processing liquid to be decolorized in-line.

[0029] In an embodiment of the inkjet recording system of the present invention, it is preferable to have a drying section downstream of the processing liquid discharge section, and that this drying section also serves as a processing liquid decolorization section. This eliminates the need for a special process section for decolorization.

[0030] In an embodiment of the inkjet recording system of the present invention, it is preferable to have a processing liquid decolorization unit downstream of the processing liquid discharge unit, and that the processing liquid decolorization unit decolorizes the processing liquid by heating or electromagnetic wave irradiation. This allows the processing liquid to be easily decolorized in-line.

[0031] In an embodiment of the inkjet recording system of the present invention, it is preferable to use multiple types of processing solutions, with each type of processing solution containing a different color of the decolorizing colorant. This makes it easy to visually distinguish between the different types of processing solutions.

[0032] In an embodiment of the inkjet recording system of the present invention, it is preferable that at least one of the processing solutions contains a coagulant. By using a processing solution containing a coagulant, the colorants are aggregated on the recording medium, preventing ink bleeding between dots and colorant show-through, ensuring image sharpness, and enabling the formation of high-quality images.

[0033] In an embodiment of the inkjet recording system of the present invention, it is preferable that at least one of the processing liquids contains a lubricant. By using a processing liquid containing a lubricant, slipperiness can be imparted to the surface of the image, thereby increasing the frictional fastness of the image.

[0034] In an embodiment of the inkjet recording system of the present invention, it is preferable that at least one of the processing solutions contains a resin having a glass transition temperature of -10°C or higher. By using a processing solution containing a resin having a glass transition temperature Tg of -10°C or higher, the fixation of the colorant to the recording medium can be improved, and the friction fastness of the image can be increased.

[0035] In an embodiment of the inkjet recording system of the present invention, it is preferable that at least one of the processing liquids contains a penetration accelerator. By using a processing liquid containing a penetration accelerator, it is possible to achieve the same color tone not only on the side of the recording medium where the coloring ink is deposited, but also on the opposite side.

[0036] In an embodiment of the inkjet recording system of the present invention, it is preferable to provide a processing liquid decolorization section downstream of the processing liquid discharge section, and a non-decolorization drying section between the processing liquid discharge section and the processing liquid decolorization section. By providing a non-decolorization drying section, the print pattern can be confirmed during print tests with the processing liquid fixed. Furthermore, by providing a processing liquid decolorization section, the processing liquid can be decolorized when not in use for print tests.

[0037] In an embodiment of the inkjet recording system of the present invention, it is preferable to have a processing liquid decolorization unit downstream of the processing liquid discharge unit, and that the processing liquid decolorization unit decolorizes the processing liquid by heating the surface temperature of the recording medium to 100°C or higher. Heating the surface temperature of the recording medium to 100°C or higher makes decolorization easier.

[0038] The present invention relates to an inkjet recording method for forming an image, characterized by the use of a processing solution containing a decolorizing agent.

[0039] The processing solution of the present invention is a processing solution used for inkjet recording and is characterized by containing a decolorizing colorant.

[0040] The present invention relates to a method for adjusting the position of a processing liquid ejection head for inkjet recording, characterized in that the position of the processing liquid ejection head is adjusted based on the printing pattern of a processing liquid containing a decolorizing colorant.

[0041] The present invention, its components, and embodiments and models for carrying out the present invention will be described in detail below. In this application, "~" is used to mean that the numerical values ​​before and after it are included as the lower limit and upper limit.

[0042] <Inkjet recording system and method> The inkjet recording system of the present invention (hereinafter also simply referred to as the "recording system") is a recording system that forms an image, and is characterized by using a processing liquid containing a decolorizing colorant.

[0043] The inkjet recording method of the present invention (hereinafter also simply referred to as the "recording method") is a recording method for forming an image, characterized by using a processing liquid containing a decolorizing colorant.

[0044] In the present invention, "image" refers to an image (including characters, patterns, photographs, etc.) formed on a recording medium by an ink such as a coloring ink or a processing solution. This image includes not only images formed by coloring ink, but also images formed solely by the processing solution.

[0045] In the present invention, "processing solution" refers to an ink used not for coloring by itself, but for some purpose of processing an image, such as assisting in coloring or coating the image. Examples of processing solutions include pre-processing solutions and post-processing solutions. On the other hand, in the present invention, "coloring ink" refers to a chromatic or achromatic ink that can be distinguished from the color of a recording medium by the average human eye, and is used for the purpose of coloring by itself.

[0046] The processing liquid according to the present invention does not contain a non-decolorizing colorant, but because it contains a decolorizing colorant, it is visible before decolorization. Therefore, the processing liquid according to the present invention makes it easy to check the printed pattern, just like with ordinary coloring inks. In addition, it makes it easier to adjust the position of the print head. Furthermore, it is possible to check from the printed pattern whether there are any missing or bent droplets when the processing liquid is dispensed. Therefore, because it is easy to check the printed pattern, it is also easy to check for missing or bent droplets.

[0047] Furthermore, because the colorant contained in the processing liquid according to the present invention is a decolorizing colorant, it can be visually confirmed when checking the printed pattern, while at the same time, it can be made colorless during image formation by applying decolorizing treatments such as heating or electromagnetic wave irradiation. Therefore, by using the processing liquid according to the present invention, it becomes possible to form an image without the processing liquid adversely affecting the color of the image.

[0048] The following are examples of the configuration of the process section of the recording system of the present invention. The order of the process sections is listed from right to left, with the downstream side being the most important. "Drying section (processing liquid decolorization section)" refers to the drying section that also serves as the processing liquid decolorization section.

[0049] Configuration example (1) Processing liquid discharge section (2) Processing liquid discharge section / Coloring ink discharge section (3) Coloring ink discharge unit / Processing liquid discharge unit (4) Processing liquid discharge unit / Coloring ink discharge unit / Processing liquid discharge unit (5) Coloring ink dispensing section / drying section / processing liquid dispensing section (6) Processing liquid discharge section / drying section (processing liquid decolorization section) (7) Processing liquid discharge section / Coloring ink discharge section / Drying section (processing liquid decolorization section) (8) Coloring ink dispensing section / Processing liquid dispensing section / Drying section (processing liquid decolorization section) (9) Processing liquid discharge section / Coloring ink discharge section / Processing liquid discharge section / Drying section (processing liquid decolorization section) (10) Coloring ink dispensing section / drying section / processing liquid dispensing section / drying section (processing liquid decolorization section) (11) Processing liquid discharge section / Drying section (processing liquid decolorization section) / Coloring ink discharge section (12) Processing liquid discharge section / Drying section (processing liquid decolorization section) / Coloring ink discharge section / Drying section (13) Processing liquid discharge section / Non-discoloration drying section (14) Processing liquid discharge section / Coloring ink discharge section / Non-decolorizing drying section (15) Coloring ink discharge unit / Processing liquid discharge unit / Non-decolorizing drying unit (16) Processing liquid discharge section / Coloring ink discharge section / Processing liquid discharge section / Non-decolorizing drying section (17) Coloring ink discharge section / drying section / processing liquid discharge section / non-decolorizing drying section (18) Processing liquid discharge section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) (19) Processing liquid discharge section / Coloring ink discharge section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) (20) Coloring ink dispensing section / Processing liquid dispensing section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) (21) Processing liquid discharge section / Coloring ink discharge section / Processing liquid discharge section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) (22) Coloring ink dispensing section / drying section / processing liquid dispensing section / non-decolorizing drying section / drying section (processing liquid decolorizing section) (23) Processing liquid discharge section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) / Coloring ink discharge section (24) Processing liquid discharge section / Non-decolorizing drying section / Drying section (processing liquid decolorizing section) / Coloring ink discharge section / Drying section

[0050] The recording system of the present invention is not limited to the above-described configuration examples (1) to (24), and other configurations are also possible.

[0051] If the recording system of the present invention has multiple process units, each process unit may be provided in the same device or in different devices.

[0052] The following describes the main process components included in the recording system.

[0053] In this invention, "processing liquid ejection unit" refers to a process unit that ejects processing liquid onto a recording medium. The processing liquid ejection unit may mainly consist of a processing liquid ejection head. When multiple processing liquids are used, a processing liquid ejection head corresponding to each processing liquid is used. The method of ejecting the processing liquid is not particularly limited as long as it is an inkjet system. By providing processing liquid ejection units both before and after the coloring ink ejection unit, processing liquid can be ejected both before and after the ejection of the coloring ink.

[0054] In this invention, the "coloring ink ejection unit" refers to a process unit that ejects coloring ink onto a recording medium. The coloring ink ejection unit may mainly consist of a coloring ink ejection head. When multiple coloring inks are used, a coloring ink ejection head corresponding to each coloring ink is used. The method of ejecting the coloring ink is not particularly limited.

[0055] The processing liquid ejection unit and the coloring ink ejection unit may be integrated. The ink (processing liquid and coloring ink) ejection mechanism may be a piezoelectric type using a piezoelectric element, or a thermal type that heats and ejects the ink. The scanning method of the ejection head may be a single-pass method or a multi-pass method.

[0056] In this invention, the "processing liquid decolorization unit" refers to a process unit that decolorizes the processing liquid applied to the recording medium. By equipping the recording system with a processing liquid decolorization unit downstream of the processing liquid discharge unit, the processing liquid can be decolorized in-line.

[0057] Examples of decolorization methods include heating and irradiation with active energy rays, which can be selected depending on the decolorizing colorant contained in the treatment solution. Examples of heating include heating with hot air, a hot plate, or a heat roller. Examples of irradiation with active energy rays include irradiation with electromagnetic waves, alpha rays, or electron beams. Examples of electromagnetic wave irradiation include irradiation with ultraviolet rays, visible light, infrared rays, gamma rays, or X-rays. From the viewpoint of simplicity, heating or electromagnetic wave irradiation are preferred as decolorization methods.

[0058] When the decolorizing section of the processing solution decolorizes the processing solution by heating, it is preferable to heat the surface temperature of the recording medium to 100°C or higher from the viewpoint of facilitating decolorization.

[0059] In this invention, the "drying section" refers to a process section that dries the processing liquid or coloring ink applied to the recording medium and fixes it to the recording medium. The drying method can be the same as the decolorization method and can be selected according to the processing liquid or coloring ink to be dried. By providing a processing liquid decolorization section downstream of the processing liquid discharge section in the recording system, the processing liquid or coloring ink can be dried inline. When the drying section is located downstream of the processing liquid discharge section, the drying section can also serve as the processing liquid decolorization section. From the viewpoint of eliminating the need for a special process section for decolorization, it is preferable for the drying section to also serve as the processing liquid decolorization section.

[0060] In this invention, the "non-decolorizing drying section" refers to a drying section located downstream of the processing liquid discharge section that dries the processing liquid and coloring ink applied to the recording medium without decolorizing it, thereby fixing them to the recording medium. The non-decolorizing drying method can be selected from heating, active energy ray irradiation, etc., depending on the properties of the decolorizing colorant contained in the processing liquid. For example, if the processing liquid contains a decolorizing colorant that does not decolorize with heating but decolorizes with ultraviolet irradiation, the processing liquid and coloring ink can be dried without decolorizing the processing liquid by using a heating method in the non-decolorizing drying section. By providing a processing non-decolorizing drying section downstream of the processing liquid discharge section in the recording system, the print pattern can be confirmed during print tests with the processing liquid fixed.

[0061] Below, several configuration examples are explained using diagrams.

[0062] Figure 1 is a schematic diagram of configuration example (1). The recording system shown in Figure 1 includes a processing liquid discharge unit 20 on top of a transport unit 10. The transport unit 10 transports the recording medium 5, and the processing liquid discharge unit 20 discharges the processing liquid onto the recording medium 5. The recording system shown in the configuration example of Figure 1 can be used, for example, when applying a processing liquid as a post-processing step to a recording medium 5 after an image has been formed in another system, or when applying a processing liquid as a pre-processing step to a recording medium 5 before an image has been formed in another system.

[0063] The recording system shown in Figure 1 allows for the application of a visible processing liquid containing a decolorizing agent to the recording medium 5, making it easy to check the print pattern during print tests, such as for adjusting the head position.

[0064] Furthermore, when the processing solution is applied to the recording medium 5 using the recording system shown in Figure 1, the processing solution can be made colorless by subsequently performing a decolorization process. This makes it possible to form an image without the processing solution adversely affecting the image's color.

[0065] Figure 2 is a schematic diagram of configuration example (6). The recording system shown in Figure 2 is equipped with a processing liquid discharge unit 20 and a processing liquid decolorization unit 40 in that order on top of the transport unit 10. As in the recording system shown in Figure 5, it is preferable to provide the processing liquid decolorization unit 40 downstream of the processing liquid discharge unit 20 from the viewpoint of being able to decolorize the processing liquid in-line.

[0066] Figure 3 is a schematic diagram of configuration example (9). The recording system shown in Figure 3 is equipped with a pre-treatment liquid discharge unit 20, a coloring ink discharge unit 30, a post-treatment liquid discharge unit 20, and a treatment liquid decolorization unit 40 in this order on top of the transport unit 10.

[0067] Figure 4 is a schematic diagram of configuration example (12). The recording system shown in Figure 4 is equipped with a pre-treatment liquid discharge unit 20, a treatment liquid decolorization unit 40, a coloring ink discharge unit 30, and a drying unit 50 on top of the transport unit 10 in this order.

[0068] Figure 5 is a schematic diagram of configuration example (19). The recording system shown in Figure 5 is equipped with a pre-treatment liquid discharge unit 20, a coloring ink discharge unit 30, a non-decolorizing drying unit 60, and a treatment liquid decolorizing unit 40 in that order on top of the transport unit 10.

[0069] Figure 6 is a schematic diagram of configuration example (21). The recording system shown in Figure 6 is equipped with, in this order, a pre-treatment liquid discharge unit 20, a coloring ink discharge unit 30, a post-treatment liquid discharge unit 20, a non-decolorizing drying unit 60, and a treatment liquid decolorizing unit 40 on top of the transport unit 10.

[0070] Figures 1-6 show an example where only one transport unit 10 is provided, but the transport unit 10 may be one unit or divided into multiple units. Figures 1-6 show an example of a transport unit 10 that transports the recording medium 5 using a transport belt supported by two rollers and moving in accordance with the rotation of the rollers. In addition, as shown in Figure 7, the roll-shaped recording medium 5 can be transported directly using a feed roller 11 and a recovery roller 12 without using a transport belt. A transport drum can also be used as the transport unit 10. It is also possible to design the system without a transport unit 10, where each process unit is scanned to perform each process.

[0071] Various media capable of fixing ink deposited on the surface can be used as recording media, such as cloth, paper, and sheet-like resin. The recording media is not limited to the recording media on which the final image is formed, but also includes transfer media used in the transfer method. The recording media may be a single sheet of a predetermined size, or a continuous long roll.

[0072] <Processing solution> The recording system of the present invention is characterized by the use of a processing liquid.

[0073] (Decolorable coloring material) The treatment solution according to the present invention is characterized by containing a color-decolorizing agent.

[0074] In this invention, "decolorizing colorant" refers to a colorant that, unlike general colorants, has the property of reversibly or irreversibly changing color due to the action of heat or active energy, such as thermochromic colorants or photochromic colorants, and which decolorizes through color change. "Decolorization" mainly means becoming colorless, but it is not necessary to become completely colorless. Depending on the color of the recording medium, the color of the colored ink used in combination, the required image quality, etc., it is sufficient for the color to be decolorized to an extent that does not adversely affect the color of the image.

[0075] The decolorizing colorants that can be used in the present invention are not particularly limited. The decolorizing colorants may be dyes or pigments.

[0076] As the decolorizing colorant, known thermochromic colorants and photochromic colorants can be used. Specific examples of known decolorizing colorants include, for example, cyanine-based dyes described as decolorizing pigments in Japanese Patent Publication No. 5-287226, disodium 5,5'-indigotine disulfonate described as a dye that changes color and disappears upon exposure to ultraviolet light in Japanese Patent Publication No. 185588, and dyes described as reversible heat-sensitive materials used in combination with a color developer in Japanese Patent Publication No. 2007-106979.

[0077] When using multiple types of treatment solutions, it is preferable that the color of the decolorizing agent contained in each type of treatment solution differs, from the viewpoint of making it easy to visually distinguish between the types of treatment solutions.

[0078] (Flocculant) The processing solution preferably contains a coagulant, depending on the application. By using a processing solution containing a coagulant, the colorants coagulate on the recording medium, preventing ink bleeding between dots and colorant show-through, ensuring image sharpness, and enabling the formation of high-quality images. The processing solution containing a coagulant is mainly used as a pre-processing solution, but it can also be used as a post-processing solution.

[0079] The flocculant is not particularly limited as long as it can flocculate the colorant. Examples of flocculants include polyvalent metal salts, monovalent metal salts, organic acids, inorganic acids, cationic polymers, and metal chelates. Among these, from the viewpoint of flocculation strength, polyvalent metal salts or organic acids are preferred, and polyvalent metal salts are more preferred.

[0080] Polyvalent metal salts are compounds composed of polyvalent metals and acids.

[0081] The types of polyvalent metals that make up the polyvalent metal salt are not particularly limited, but examples include calcium, magnesium, aluminum, copper, nickel, tin, barium, iron, chromium, yttrium, and zinc. Among these, calcium or magnesium is preferred from the viewpoint of cohesive force, and calcium is more preferred.

[0082] The type of acid constituting the polyvalent metal salt is not particularly limited and may be an organic acid or an inorganic acid. However, from the viewpoint of cohesive force, organic acids are preferred, sulfonic acids are more preferred, and aromatic sulfonic acids are even more preferred. Suitable aromatic sulfonic acids for constituting the polyvalent metal salt include, for example, p-toluenesulfonic acid and cumenesulfonic acid.

[0083] Examples of organic acids that can constitute polyvalent metal salts other than sulfonic acids include sulfonic acid, boric acid, carboxylic acid, formic acid, acetic acid, propionic acid, isobutyric acid, oxalic acid, fumaric acid, malic acid, citric acid, malonic acid, succinic acid, maleic acid, benzoic acid, 2-pyrrolidone-5-carboxylic acid, lactic acid, acrylic acid or its derivatives, methacrylic acid or its derivatives, acrylamide or its derivatives, etc. Examples of inorganic acids that can constitute polyvalent metal salts include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, boric acid, hydrofluoric acid, carbonic acid, etc.

[0084] Monovalent metal salts are compounds composed of a monovalent metal and an acid.

[0085] Examples of monovalent metals that make up monovalent metal salts include sodium and potassium. Examples of acids that make up monovalent metal salts include the same acids that make up polyvalent metal salts mentioned above.

[0086] Examples of organic acids include formic acid, acetic acid, propionic acid, isobutyric acid, oxalic acid, fumaric acid, malic acid, citric acid, malonic acid, succinic acid, maleic acid, benzoic acid, 2-pyrrolidone-5-carboxylic acid, lactic acid, acrylic acid or its derivatives, methacrylic acid or its derivatives, acrylamide or its derivatives, sulfonic acid derivatives, and the like.

[0087] It is preferable to use organic acids that have not been completely neutralized by a base. Neutralization by a base means that the acidic groups of these acids are ionically bonded to other positively charged elements or compounds (for example, inorganic compounds such as metals). Furthermore, not being completely neutralized means that among the acidic groups of the organic acid, there are acidic groups that do not form the above-mentioned ionic bonds.

[0088] Examples of inorganic acids include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, boric acid, hydrofluoric acid, and carbonic acid.

[0089] Examples of cationic polymers include polyallylamine, polyvinylamine, polyethyleneimine, and polydiallyldimethylammonium chloride.

[0090] Examples of metal chelates include those in which acetylacetone, methyl acetoacetate, ethyl acetoacetate, ethyl lactate, methyl salicylate, and other nitrogen-containing groups are coordinated to metals such as aluminum, zinc, cadmium, nickel, cobalt, copper, calcium, barium, titanium, manganese, iron, lead, zirconium, chromium, and tin.

[0091] The amount of coagulant in the treatment solution is not particularly limited and can be adjusted as appropriate.

[0092] (Lubricant) The processing solution preferably contains a lubricant, depending on the application. Using a processing solution containing a lubricant can impart slipperiness to the image surface, thereby increasing the image's frictional durability. Processing solutions containing lubricants are primarily used as post-processing solutions for overcoating.

[0093] Examples of lubricants include, Carnauba wax, candelilla wax, beeswax, rice wax, lanolin, and other plant and animal-based waxes; Paraffin wax, microcrystalline wax, polyolefin wax (e.g., polyethylene wax, polypropylene wax), oxidized polyolefin wax (e.g., oxidized polyethylene wax), petroleum-based waxes such as petrolatum; Mineral waxes such as montane wax and ozokerite; Synthetic waxes such as carbon wax, Hoechst wax, polyolefin wax, stearic acid amide, and α-olefin / maleic anhydride copolymer; Organosilicon compounds; These are some examples.

[0094] The organosilicon compound is preferably a silicone resin. The silicone resin may be in the form of an oil, latex, or resin. The silicone resin is preferably a silicone acrylic resin.

[0095] Silicone acrylic resin is a copolymer containing siloxane structural units and (meth)acrylic acid ester structural units.

[0096] The content of structural units derived from (meth)acrylic acid ester is not particularly limited, but is preferably 20 to 80% by mass, and more preferably 30 to 70% by mass, relative to the total structural units constituting the copolymer.

[0097] Examples of commercially available silicone resins include Charine FE502 and E-370 (manufactured by Nisshin Chemical Industry Co., Ltd., silicone-acrylic polymers), and Cymac US-450 and US-480 (manufactured by Toagosei Co., Ltd., silicone-acrylic polymers).

[0098] The lubricant content is not particularly limited and can be adjusted as appropriate.

[0099] (Resin with a glass transition temperature (Tg) of -10°C or higher) The processing solution preferably contains a resin with a glass transition temperature (Tg) of -10°C or higher, depending on the application. Using a processing solution containing a resin with a glass transition temperature (Tg) of -10°C or higher can improve the fixation of the colorant to the recording medium and increase the frictional fastness of the image. Processing solutions containing resins with a glass transition temperature (Tg) of -10°C or higher are mainly used as post-processing solutions for overcoating. The glass transition temperature (Tg) of the resin can be determined in accordance with JIS K7121.

[0100] Examples of resins include (meth)acrylic resins, polystyrene resins, polyurethane resins, polyester resins, and polyalkylene resins. Among these, (meth)acrylic resins are preferred from the viewpoint of ease of adjusting the glass transition temperature (Tg) and frictional fastness.

[0101] (Meth)acrylic resins are resins polymerized using monomers having (meth)acryloyl groups as the main component.

[0102] Examples of monomers having a (meth)acryloyl group include: (meth)acrylic acid; (For example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, isopropyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, n-hexyl (meth)acrylate, n-dodecyl (meth)acrylate, n-stearyl (meth)acrylate, etc., phenylethoxy (meth)acrylate, cyclohexyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, benzyl (meth)acrylate, quaternary ammonium group-containing (meth)acrylate, glycidyl (meth)acrylate, and other functional group-containing (meth)acrylate esters; (meth)acrylamides such as (meth)acrylamide, (meth)methylacrylamide, (meth)ethylacrylamide, (meth)n-propylacrylamide, N-isopropyl(meth)acrylacrylamide, (meth)butylacrylamide, (meth)cyclohexylacrylamide, (meth)benzylacrylamide, hydroxymethylacrylamide, (meth)methoxymethylacrylamide, butoxymethylacrylamide, methoxyethylacrylamide, (meth)phenylacrylamide, and diacetoneacrylamide; (meth)acrylonitrile; These are some examples.

[0103] Examples of monofunctional monomers that may be copolymerized with monomers having a (meth)acryloyl group include: Ethylene-unsaturated carboxylic acids such as maleic acid and itaconic acid; Styrene compounds such as styrene, alpha-methylstyrene, and vinyltoluene; Saturated vinyl fatty acids such as vinyl acetate and vinyl propionate; Vinyl compounds such as 1,4-divinyloxybutane and divinylbenzene; Allyl compounds such as diallyl phthalate and triallyl cyanurate; These are some examples.

[0104] Examples of two- or more functional monomers that may be copolymerized with monomers having a (meth)acryloyl group include diethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, propylene glycol di(meth)acrylate, polyfunctional (meth)acrylates such as N,N′-methylenebis(acrylamide), and polyfunctional acrylamides.

[0105] The (meth)acrylic resin may have crosslinkable groups. It is preferable to include a (meth)acrylic resin having crosslinkable groups in the processing solution, and further include a crosslinking agent in the processing solution, or to include a crosslinking agent in the coloring ink or other processing solution used in combination. This allows the resin to be post-crosslinked, thereby suppressing the stickiness of the image caused by the resin.

[0106] The crosslinkable monomer used in the polymerization of resins having crosslinkable groups can be any polymerizable compound having a crosslinkable group that reacts with the crosslinking agent. For example, when using a crosslinking agent that reacts with a hydroxyl group, monomers having a hydroxyl group, specifically hydroxyethyl (meth)acrylate and hydroxypropyl (meth)acrylate, can be used. When using a crosslinking agent that reacts with a carboxyl group, monomers having a carboxyl group, specifically (meth)acrylic acid and maleic acid, can be used. When using a crosslinking agent that reacts with a ketone group, monomers having a ketone group can be used. Specifically, diacetone acrylamide (DAAM) can be used.

[0107] The content of structural units derived from crosslinkable monomers is preferably 0.1 to 30% by mass, and more preferably 1 to 10% by mass, relative to the total structural units constituting the resin.

[0108] The (meth)acrylic resin may be pre-crosslinked. The crosslinked (meth)acrylic resin may be a copolymer of a monofunctional vinyl monomer containing at least one of (meth)acrylic acid ester and (meth)acrylonitrile and a polyfunctional vinyl monomer. The crosslinked (meth)acrylic resin is preferable in that it is less likely to fuse and form a film when drying after the application of the treatment solution.

[0109] The resin having a glass transition temperature (Tg) of -10°C or higher is preferably a resin particle. The resin particle may be a composite particle containing two or more resins, for example, a core-shell particle having a core layer and a shell layer. Specifically, the resin particle may have a core layer containing a copolymer of alkyl acrylate, methyl methacrylate, and a crosslinkable monomer, and a shell layer containing a copolymer of alkyl acrylate, methyl methacrylate, and a monomer having a dispersible group such as an ethylenically unsaturated carboxylic acid.

[0110] The average particle size of the resin particles may be, for example, in the range of 80 to 400 nm, preferably in the range of 150 to 300 nm.

[0111] The content of resins with a glass transition temperature (Tg) of -10°C or higher is not particularly limited and can be adjusted as appropriate.

[0112] The crosslinking agent is preferably a compound having at least two functional groups in its molecule that react with crosslinkable groups such as hydroxyl groups, carboxyl groups, and ketone groups present in the resin.

[0113] Examples of crosslinkable groups that react with hydroxyl groups include isocyanate groups and blocked isocyanate groups. Examples of crosslinkable groups that react with carboxyl groups include oxazolyl groups, aziridine groups, and carbodiimide groups. Examples of crosslinkable groups that react with ketone groups include hydrazide groups.

[0114] Specifically, examples of crosslinking agents that react with hydroxyl groups include Fixer N (block isocyanate-based crosslinking agent, manufactured by Matsui Pigment Chemical Industry Co., Ltd.). Examples of crosslinking agents that react with carboxyl groups include Fixer F (aziridine-based crosslinking agent, manufactured by Matsui Pigment Chemical Industry Co., Ltd.). Examples of crosslinking agents that react with ketone groups include adipic acid dihydrazide (ADH, hydrazine-based crosslinking agent).

[0115] From the viewpoint of being able to be stored at room temperature for a long period of time and being able to be crosslinked at room temperature, adipic acid dihydrazide is most preferred, and the combination with the crosslinkable monomer diacetone acrylamide (DAAM) that reacts with it is most preferred.

[0116] The amount of crosslinking agent is not particularly limited and can be adjusted as appropriate.

[0117] (Penetration enhancer) The processing solution preferably contains a penetration accelerator, depending on the application. Using a processing solution containing a penetration accelerator makes it possible to achieve the same color tone not only on the side of the recording medium where the coloring ink is deposited, but also on the opposite side. The processing solution containing a penetration accelerator is mainly used as a pre-treatment solution, but it can also be used as a post-treatment solution.

[0118] Penetration enhancers specifically include organic solvents, surfactants, and compounds having a lactam structure. Penetration enhancers may be used individually or in combination of two or more.

[0119] The organic solvents applicable as penetration enhancers are not particularly limited and include, for example, glycol ether solvents, nitrogen-containing solvents, aprotic polar solvents, alkyl polyol solvents, monoalcohol solvents, and the like.

[0120] Among organic solvents, alkyl polyols are preferred. Using alkyl polyols tends to improve clogging reliability when applying the processing solution using an inkjet method.

[0121] Examples of alkyl polyols include 1,2-pentanediol (104°C), propylene glycol (188°C), 1,2-butanediol (193°C), ethylene glycol (197°C), 1,3-butanediol (207°C), 1,3-propanediol (214°C), 1,2-hexanediol (223°C), 1,4-butanediol (230°C), 2-methyl-2-propyl-1,3-propanediol (230°C), 1,5-pentanediol (242°C), 2-ethyl-1,3-hexanediol (244°C), 3-methyl-1,5-pentanediol (249°C), and 1,6-hexanediol (250°C). Among these, alkyl polyols with a boiling point of 200°C or lower are preferred. Examples of alkyl polyols with boiling points below 200°C include propylene glycol (188°C), 1,2-butanediol (193°C), and ethylene glycol (197°C). The numbers in parentheses represent the standard boiling points.

[0122] Glycol ethers are also preferably used as organic solvents. Examples of glycol ethers include dipropylene glycol dimethyl ether (171°C), diethylene glycol ethyl methyl ether (176°C), diethylene glycol isopropyl methyl ether (179°C), dipropylene glycol monomethyl ether (188°C), diethylene glycol diethyl ether (189°C), diethylene glycol monomethyl ether (194°C), diethylene glycol butyl methyl ether (212°C), tripropylene glycol dimethyl ether (215°C), triethylene glycol dimethyl ether (216°C), diethylene glycol monobutyl ether (230°C), dipropylene glycol (230°C), diethylene glycol (245°C), ethylene glycol monophenyl ether (245°C), triethylene glycol monomethyl ether (249°C), and diethylene glycol dibutyl ether (256°C). Among these, diethylene glycol monobutyl ether (230°C) and triethylene glycol monomethyl ether (230°C) are more preferred. The numbers in parentheses represent the standard boiling point.

[0123] Suitable surfactants for use as penetration enhancers include fluorine-based or silicone-based surfactants with high static surface tension reduction capabilities, anionic surfactants such as dioctyl sulfosuccinate with high dynamic surface tension reduction capabilities, and nonionic surfactants such as relatively low molecular weight polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, acetylene glycols, Pluronic-type surfactants (Pluronic is a registered trademark), and sorbitan derivatives. It is also preferable to use a combination of a fluorine-based or silicone-based surfactant and a surfactant with high dynamic surface tension reduction capabilities.

[0124] Preferred silicone-based surfactants include polyether-modified polysiloxane compounds, such as KF-351A and KF-642 from Shin-Etsu Chemical Co., Ltd., BYK345, BYK347, and BYK348 from Big Chemie Corporation, and Tegowet 260 from Evonik Corporation.

[0125] Fluorine-based surfactants refer to surfactants in which some or all of the hydrogen atoms bonded to the carbon atoms of the hydrophobic groups of ordinary surfactants are replaced with fluorine. Among these, those having a perfluoroalkyl group in the molecule are preferred.

[0126] Some fluorine-based surfactants are marketed under the trade names Megafac F by DIC, Surflon by AGC, Fluorad FC by Minnesota Mining and Manufacturing Company, Monflor by Imperial Chemical Industries, Zonyls by E.I. DuPont Nemeras & Company, and Licowet VPF by Farbewerke Hoechst.

[0127] Acetylene glycol-based surfactants and acetylene alcohol-based surfactants are also preferably used as surfactants.

[0128] The acetylene glycol-based surfactant and the acetylene alcohol-based surfactant are not particularly limited, but it is preferable to select one or more from the group consisting of 2,4,7,9-tetramethyl-5-decine-4,7-diol and alkylene oxide adducts of 2,4,7,9-tetramethyl-5-decine-4,7-diol, and 2,4-dimethyl-5-decine-4-ol and alkylene oxide adducts of 2,4-dimethyl-5-decine-4-ol. These are commercially available products such as the Olphine 104 series, the E series including Olphine E1010, Olphine PD002W002, Surfinol 465, Surfinol 61 (manufactured by Nisshin Chemical Industry Co., Ltd.), and Perex SS-H (manufactured by Kao Chemical Co., Ltd.).

[0129] Examples of lactam compounds applicable as penetration enhancers include 2-pyrrolidone, 2-acetylidinone, 2-piperidone, ε-caprolactam, 4-ethyl-2-acetylidinone, N-methyl-2-pyrrolidone, and 3-amino-2-piperidone.

[0130] The amount of penetration enhancer is not particularly limited and can be adjusted as appropriate.

[0131] (Other ingredients) In addition to the above components, the processing solution may contain water, colorant dispersants, surfactants, preservatives, fungicides, pH adjusters, etc.

[0132] <Ink for coloring> The recording system of the present invention can use colored ink.

[0133] (Non-erasable coloring material) The coloring ink contains a non-fading colorant. In this invention, "non-fading colorant" refers to a general colorant that does not have fading properties.

[0134] The non-fading colorants that can be used in the present invention are not particularly limited. The non-fading colorants may be dyes or pigments.

[0135] The pigment may be, for example, an organic or inorganic pigment with the following numbers listed in the color index.

[0136] Examples of red or magenta pigments include Pigment Red 3, 5, 19, 22, 31, 38, 43, 48:1, 48:2, 48:3, 48:4, 48:5, 49:1, 53:1, 57:1, 57:2, 58:4, 63:1, 81, 81:1, 81:2, 81:3, 81:4, 88, 104, 108, 112, 122, 123, 144, 146, 149, 166, 168, 169, 170, 177, 178, 179, 184, 185, 208, 216, 226, 257; Pigment Violet 3, 19, 23, 29, 30, 37, 50, 88; and Pigment Orange 13, 16, 20, 36.

[0137] Examples of blue or cyan pigments include Pigment Blue 1, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 17-1, 22, 27, 28, 29, 36, and 60.

[0138] Examples of green pigments include Pigment Green 7, 26, 36, and 50.

[0139] Examples of yellow pigments include Pigment Yellow 1, 3, 12, 13, 14, 17, 34, 35, 37, 55, 74, 81, 83, 93, 94, 95, 97, 108, 109, 110, 137, 138, 139, 153, 154, 155, 157, 166, 167, 168, 180, 185, and 193.

[0140] Examples of black pigments include Pigment Black 7, 28, and 26.

[0141] Examples of commercially available pigments include Chromofine Yellow 2080, 5900, 5930, AF-1300, 2700L, Chromofine Orange 3700L, 6730, Chromofine Scarlet 6750, Chromofine Magenta 6880, 6886, 6891N, 6790, 6887, Chromofine Violet RE, Chromofine Red 6820, 6830, Chromofine Blue HS-3, 5187, 5108, 5197, 5085N, SR-5020, 5026, 5050, 4920, 4927, 4937, 4824, 4933GN-EP, 4940, 4973, 5205, 5208, 5214, 5221, 5000P, Chromofine Green 2GN, 2GO, 2G-550D, 5310, 5370, 6830, Chromofine Black A-1103, Seika Fast Yellow 10GH, A-3, 2035, 2054, 2200, 2270, 2300, 2400(B), 2500, 2600, ZAY-260, 2700(B), 2770, Seika Fast Red 8040, C405(F), CA120, LR-116, 1531B, 8060R, 1547, ZAW-262, 1537B, GY, 4R-4016, 3820, 3891, ZA-215, Seika Fast Carmine 6B1476T-7, 1483LT, 3840, 3870, Seika Fast Bordeaux 10B-430, Seika Light Rose R40, Seika Light Violet B800, 7805, Seika Fast Maroon 460N, Seika Fast Orange 900, 2900, Seika Light Blue C718, A612, Cyanine Blue 4933M, 4933GN-EP, 4940, 4973 (manufactured by Dainichi Seika Kogyo); KET Yellow 401, 402, 403, 404, 405, 406, 416, 424; KET Orange 501; KET Red 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 336, 337, 338, 346; KET Blue 101, 102, 103, 104, 105, 106, 111, 118, 124; KET Green 201 (manufactured by Dainippon Ink and Chemicals);Colortex Yellow 301, 314, 315, 316, P-624, 314, U10GN, U3GN, UNN, UA-414, U263, Finecol Yellow T-13, T-05, Pigment Yellow1705, Colortex Orange 202, Colortex Red101, 103, 115, 116, D3B, P-625, 102, H-1024, 105C, UFN, UCN, UBN, U3BN, URN, UGN, UG276, U456, U457, 105C, USN, Colortex Maroon601, Colortex BrownB610N, Colortex Violet600, Pigment Red 122, Colortex Blue516, 517, 518, 519, A818, P-908, 510, Colortex Green 402, 403, Colortex Black 702, U905 (manufactured by Sanyo Pigment); Lionol Yellow 1405G, Lionol Blue FG7330, FG7350, FG7400G, FG7405G, ES, ESP-S (manufactured by Toyo Ink), Toner Magenta E02, Permanent Rubin F6B, Toner Yellow HG, Permanent Yellow GG-02, Hostapean Blue B2G (manufactured by Hoechst Industries); Novoperm P-HG, Hostapean Pink E, Hostapean Blue B2G (Clarant); includes carbon black #2600, #2400, #2350, #2200, #1000, #990, #980, #970, #960, #950, #850, MCF88, #750, #650, MA600, MA7, MA8, MA11, MA100, MA100R, MA77, #52, #50, #47, #45, #45L, #40, #33, #32, #30, #25, #20, #10, #5, #44, and CF9 (Mitsubishi Chemical).

[0142] Examples of dyes include dispersible dyes, reactive dyes, acid dyes, basic dyes, and direct dyes. Note that inks containing dispersible dyes are called dispersible inks, and inks containing reactive dyes are also called reactive inks.

[0143] As a dispersible dye, sublimation dyes can also be used. A "sublimation dye" is a dye that has the property of sublimating when heated.

[0144] As for dispersible dyes, there are no particularly defined characteristics, but for example, CI Disperse Yellow 3, 4, 5, 7, 9, 13, 23, 24, 30, 33, 34, 42, 44, 49, 50, 51, 54, 56, 58, 60, 63, 64, 66, 68, 71, 74, 76, 79, 82, 83, 85, 86, 88, 90, 91, 93, 98, 99, 100, 104, 108, 114, 116, 118, 119, 122, 124, 126, 135, 140, 141, 149, 160, 162, 163, 164, 165, 179, 180, 182, 183, 184, 186, 1 92, 198, 199, 202, 204, 210, 211, 215, 216, 218, 224, 227, 231, 232; CI Disperse Orange 1, 3, 5, 7, 11, 13, 17, 20, 21, 25, 29, 30, 31, 32, 33, 37, 38, 42, 43, 44, 45, 46, 47, 48, 49, 50, 53, 54, 55, 56, 57, 58, 59, 61, 66, 71, 73, 76, 78, 80, 89, 90, 91, 93, 96, 97, 119, 127, 130, 139, 142; CI Disperse Red 1, 4, 5, 7, 11, 12, 1 3, 15, 17, 27, 43, 44, 50, 52, 53, 54, 55, 56, 58, 59, 60, 65, 72, 73, 74, 75, 76, 78, 81, 82, 86, 88, 90, 91, 92, 93, 96, 103, 105, 106, 107, 108, 110, 111, 113 ,117,118,121,122,126,127,128,131,132,134,135,137,143,145,146,151,152,153,154,157,159,164,167,169,177,179,181,183,184,185,18 8, 189, 190, 191, 192, 200, 201, 202, 203, 205, 206, 207, 210, 221, 224, 225, 227, 229, 239, 240, 257, 258, 277, 278, 279, 281, 288, 298, 302, 303, 310, 311, 312, 320, 324, 328; CI Disperse Violet 1, 4, 8, 23, 26, 27, 28, 31, 33, 35, 36, 38, 40, 43, 46, 48, 50, 51, 52, 56, 57, 59, 61, 63, 69, 77; CI Disperse Green 9; CIDisperse Brown 1, 2, 4, 9, 13, 19; CI Disperse Blue 3, 7, 9, 14, 16, 19, 20, 26, 27, 35, 43, 44, 54, 55, 56, 58, 60, 62, 64, 71, 72, 73, 75, 79, 81, 82, 83, 87, 91, 93, 94, 95, 96, 102, 106, 108, 112, 113, 115, 118, 120, 122, 125, 128, 130, 139, 141, 142, 143, 146, 148, 149 Examples include 153, 154, 158, 165, 167, 171, 173, 174, 176, 181, 183, 185, 186, 187, 189, 197, 198, 200, 201, 205, 207, 211, 214, 224, 225, 257, 259, 267, 268, 270, 284, 285, 287, 288, 291, 293, 295, 297, 301, 315, 330, 333, 359, 360; and CI Disperse Black 1, 3, 10, 24.

[0145] Acid dyes are not particularly limited, but for example, CI Acid Yellow 1, 3, 6, 11, 17, 18, 19, 23, 25, 36, 38, 40, 40:1, 42, 44, 49, 59, 59:1, 61, 65, 67, 72, 73, 79, 99, 104, 159, 169, 176, 184, 193, 200, 204, 207, 215, 219, 219:1, 220, 230, 232, 235, 241, 242, 246; CI Acid Orange 3, 7, 8, 10, 19, 22, 24, 33, 51, 51S, 56, 67, 74, 80, 8 6, 87, 88, 89, 94, 95, 107, 108, 116, 122, 127, 140, 142, 144, 149, 152, 156, 162, 166, 168, CI Acid Red 1, 6, 8, 9, 13, 18, 27, 35, 37, 52, 54, 57, 60, 73, 82, 88, 97, 97:1, 106, 111, 114, 118, 119, 127, 131, 138, 143, 145, 151, 183, 195, 198, 211, 215, 217, 225, 226, 249, 251, 254, 256, 257, 260, 261, 265, 266, 274, 276, 277, 289, 296, 299, 315, 318, 336, 337, 357, 359, 361, 362, 364, 366, 399, 407, 415; CI Acid Violet 17, 19, 21, 42, 43, 47, 48, 49, 54, 66, 78, 90, 97, 102, 109, 126; CI Acid Blue 1, 7, 9, 15, 23, 25, 40, 61:1, 62, 72, 74, 80, 83, 90, 92, 103, 104, 112, 113, 114, 120, 127, 127:1, 128, 129, 138, 140, 142, 156, 158, 171, 182, 185, 193, 199, 201, 203, 204, 205, 207, 209, 220, 221, 224, 225, 229, 230, 239, 258, 260, 264, 277:1, 278, 279, 280, 284, 290, 296, 298, 300, 317, 324, 333, 335, 338, 342, 350; CI Acid Green 9, 12, 16, 19, 20, 25, 27, 28, 40, 43, 56, 73, 81, 84, 104, 108, 109; CIExamples include Acid Brown 2, 4, 13, 14, 19, 28, 44, 123, 224, 226, 227, 248, 282, 283, 289, 294, 297, 298, 301, 355, 357, 413; CI Acid Black 1, 2, 3, 24, 24:1, 26, 31, 50, 52, 52:1, 58, 60, 63, 63S, 107, 109, 112, 119, 132, 140, 155, 172, 187, 188, 194, 207, 222, etc.

[0146] Basic dyes are not particularly limited, but examples include CI Basic Yellow 1, 2, 13, 19, 21, 25, 32, 36, 40, 51; CI Basic Red 1, 5, 12, 19, 22, 29, 37, 39, 92; CI Basic Blue 1, 3, 9, 11, 16, 17, 24, 28, 41, 45, 54, 65, 66; CI Basic Black 2, 8, etc.

[0147] The direct dyes are not particularly limited, but for example, CI Direct Yellow 8, 9, 10, 11, 12, 22, 27, 28, 39, 44, 50, 58, 86, 87, 98, 105, 106, 130, 137, 142, 147, 153; CI Direct Orange 6, 26, 27, 34, 39, 40, 46, 102, 105, 107, 118; CI Direct Red 2, 4, 9, 23, 24, 31, 54, 62, 69, 79, 80, 81, 83, 84, 89, 95, 212, 224, 225, 226, 227, 239, 242, 243, 254; CI Direct Violet 9, 35, 51, 66, 94, 95; CI Direct Blue 1, 15, 71, 76, 77, 78, 80, 86, 87, 90, 98, 106, 108, 160, 168, 189, 192, 193, 199, 200, 201, 202, 203, 218, 225, 229, 237, 244, 248, 251, 270, 273, 274, 290, 291; CI Direct Green 26 Examples include 28, 59, 80, 85; CI Direct Brown 44, 44:1, 106, 115, 195, 209, 210, 212:1, 222, 223; CI Direct Black 17, 19, 22, 32, 51, 62, 108, 112, 113, 117, 118, 132, 146, 154, 159, 169, etc.

[0148] The reactive dyes are not particularly limited, but for example, CI Reactive Yellow 2, 3, 7, 15, 17, 18, 22, 23, 24, 25, 27, 37, 39, 42, 57, 69, 76, 81, 84, 85, 86, 87, 92, 95, 102, 105, 111, 125, 135, 136, 137, 142, 143, 145, 151, 160, 161, 165, 167, 168, 175, 176; CI Reactive Orange 1, 4, 5, 7, 11, 12, 13, 15, 16, 20, 30, 35, 5 6, 64, 67, 69, 70, 72, 74, 82, 84, 86, 87, 91, 92, 93, 95, 99, 107; CI Reactive Red 2, 3, 3:1, 5, 8, 11, 21, 22, 23, 24, 28, 29, 31, 33, 35, 43, 45, 49, 55, 56, 58, 65, 66, 78, 83, 84, 106, 111, 112, 113, 114, 116, 120, 123, 124, 128, 130, 136, 141, 147, 158, 159, 171, 174, 180, 183, 184, 18 7, 190, 193, 194, 195, 198, 218, 220, 222, 223, 226, 228, 235, 245; CI Reactive Violet 1, 2, 4, 5, 6, 22, 23, 33, 36, 38; CI Reactive Blue 2, 3, 4, 7, 13, 14, 15, 19, 21, 25, 27, 28, 29, 38, 39, 41, 49, 50, 52, 63, 69, 71, 72, 77, 79, 89, 104, 109, 112, 113, 114, 116, 119, 120, 122, 137, 140, Examples include 143, 147, 160, 161, 162, 163, 168, 171, 176, 182, 184, 191, 194, 195, 198, 203, 204, 207, 209, 211, 214, 220, 221, 222, 231, 235, 236; CI Reactive Green 8, 12, 15, 19, 21; CI Reactive Brown 2, 7, 9, 10, 11, 17, 18, 19, 21, 23, 31, 37, 43, 46; CI Reactive Black 5, 8, 13, 14, 31, 34, 39, etc.

[0149] The content of non-decolorizing colorants is not particularly limited and can be adjusted as appropriate.

[0150] (Other ingredients) In addition to the above components, the coloring ink may contain water, organic solvents, thickeners, colorant dispersants, surfactants, preservatives, fungicides, pH adjusters, resins, etc.

[0151] <Adjusting the position of the processing liquid discharge head> Using the processing liquid of the present invention makes it possible to easily adjust the position of the processing liquid dispensing head. Specifically, by performing the adjustment based on the printing pattern of the processing liquid containing a decolorizing colorant, the position of the processing liquid dispensing head can be easily adjusted.

[0152] The position of the processing liquid discharge head can be adjusted, for example, according to the flowchart shown in Figure 8. When adjusting the position of the processing liquid discharge head according to the flowchart shown in Figure 8, after printing the processing liquid print pattern, the print pattern is checked, and based on that, it is determined whether or not the position of the processing liquid discharge head needs to be adjusted. If adjustment is necessary, the position is adjusted, including the tilt, by adjusting screws, etc., and the print pattern is printed again. Note that it is not always necessary to print the print pattern again.

[0153] The method for adjusting the position of the processing liquid ejection head described above is the same as the method for adjusting the position of a normal coloring ink ejection head. In other words, by adjusting the position of the processing liquid ejection head based on the printing pattern of the processing liquid containing the decolorizing colorant, the position of the processing liquid ejection head can be easily adjusted without the need for media replacement, ink replacement operations, or special visualization equipment. [Explanation of symbols]

[0154] 5. Recording media 10 Conveying section 11 Feed roller 12 Recovery Roller 20 Processing liquid discharge section 30. Ink ejection section for coloring 40. Discoloration section of the processing solution 50 Drying section 60 Non-decolorizing drying section

Claims

1. An inkjet recording system for forming an image, A treatment solution containing a color-decolorizing agent is used. An inkjet recording system characterized by the following features.

2. A processing liquid decolorization section is provided downstream of the processing liquid discharge section. The inkjet recording system according to feature 1.

3. A drying section is provided downstream of the processing liquid discharge section, and this drying section also serves as a processing liquid decolorization section. The inkjet recording system according to feature 1.

4. A processing liquid decolorization section is provided downstream of the processing liquid discharge section, and this processing liquid decolorization section decolorizes the processing liquid by heating or electromagnetic wave irradiation. The inkjet recording system according to feature 1.

5. Multiple types of the aforementioned processing solution are used, and the color of the decolorizing agent contained in each type of processing solution differs. The inkjet recording system according to feature 1.

6. At least one of the aforementioned processing liquids contains a coagulant. The inkjet recording system according to feature 1.

7. At least one of the aforementioned processing liquids contains a lubricant. The inkjet recording system according to feature 1.

8. At least one of the processing liquids contains a resin having a glass transition temperature of -10°C or higher. The inkjet recording system according to feature 1.

9. At least one of the aforementioned processing liquids contains a penetration enhancer. The inkjet recording system according to feature 1.

10. A processing liquid decolorization section is provided downstream of the processing liquid discharge section. A non-discoloration drying section is provided between the processing liquid discharge section and the processing liquid decolorization section. The inkjet recording system according to feature 1.

11. A processing liquid decolorization unit is provided downstream of the processing liquid discharge unit, and this processing liquid decolorization unit decolorizes the processing liquid by heating the surface temperature of the recording medium to 100°C or higher. The inkjet recording system according to feature 1.

12. An inkjet recording method for forming an image, A treatment solution containing a color-decolorizing agent is used. An inkjet recording method characterized by the following.

13. A processing solution used for inkjet recording, Contains a color-decolorizing agent. A processing liquid characterized by the following features.

14. A method for adjusting the position of the processing liquid ejection head for inkjet recording, The position of the processing liquid discharge head is adjusted based on the printing pattern of the processing liquid containing a decolorizing agent. A method for adjusting the position of a processing liquid discharge head, characterized by the above.

Images