JP3777645B2 - Inkjet recording method - Google Patents

Description

【００７３】
表１より明らかなように、実施例１、２においては紙シワが発生しない良好な印刷物が得られた。特に、実施例２においてはにじみが全くない鮮明な印刷が得られた。実施例２の印字はひげ状のにじみが発生したものの実用レベルにあった。それに対して、実施例３においてはにじみがなく鮮明な印刷が得られたものの、紙シワが発生した。
【００７４】
【発明の効果】
以上述べたように本発明によれば、多価金属塩を含んでなる第一液を記録媒体に付着させ、第一液の付着部分をインク組成物付着部分より小さくする事により、普通紙において高印刷品質で紙シワのない良好な印刷物が得られる。特に、第一液および／またはインク組成物付着ドット数をカウントし、隣接するドットすべてに同一色のインク組成物が付着するドットのみに第一液が付着しないドットが存在するように、第一液付着ドット数をインク組成物付着ドット数より少なくする装置によれば、ひげ状のにじみもまったく発生しない印刷が維持できる。
【００７５】
また、本発明によれば、第一液の消費量が節約できるため、ランニングコスト低減が可能となるばかりでなく、第一液のタンクとインクタンクとが一体型のカートリッジにおいてはその容量を小さくする事ができ、小型化が可能となる。
【００７６】
さらに、本発明によれば、第一液の付着ドット数の減小量をコントロールする事により、フレキシブルな階調表現が可能となり、高印刷品質化に有利となる。
【図面の簡単な説明】
【図１】本発明によるインクジェット記録装置を示す図であって、この態様においては記録ヘッドとインクタンクがそれぞれ独立してなり、インク組成物および第一液はインクチューブによって記録ヘッドに供給される。
【図２】記録ヘッドのノズル面の拡大図であって、１ｂが第一液のノズル面であり、１ｃがインク組成物のノズル面である。
【図３】図２の記録ヘッドを用いたインクジェット記録を説明する図である。図中で３１は第一液付着領域であり、３２は第一液が付着された上にインク組成物が印字された印字領域である。
【図４】本発明によるの記録ヘッドの別の態様を示す図であって、吐出ノズルが全て横方向に並べて構成されたものである。
【図５】本発明によるインクジェット記録装置を示す図であって、この態様においては記録ヘッドとインクタンクが一体化されてなる。
【図６】実施例の記録像を示す図である。
【図７】本発明による記録方法の第１の実施例を説明する図である。
【図８】本発明による記録方法の第２の実施例を説明する図である。
【図９】本発明の第一液を吐出する記録ヘッドの吐出量の制御を説明するための図である。
【符号の説明】
１ 記録ヘッド
２ インクタンク
３ インクチューブ
２１ 第一液吐出ノズル
２２、２３、２４、２５ インク組成物吐出ノズル
３１ 第一液付着領域
３２ 印字領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet printer recording method and apparatus, and more particularly to an ink jet recording method and apparatus capable of high-quality printing even on plain paper.
[0002]
[Prior art]
An ink jet recording apparatus is a printing apparatus that performs printing by causing ink droplets to fly and adhere to a recording material such as paper. This is characterized in that a high-resolution and high-quality image can be printed at a high speed with a relatively inexpensive apparatus. Inks generally used for ink jet recording generally contain water as a main component and contain a coloring component and a wetting agent such as glycerin for the purpose of preventing clogging.
[0003]
However, when printing is performed on plain paper using such ink, the ink penetrates into the recording paper and sufficient image density cannot be obtained, or "bleeding" caused by uneven penetration, There was a problem such as “printing unevenness”. In addition, when color printing is performed, ink of different colors adheres one after another before fixing the previously adhered ink, so that the color is mixed unevenly at the boundary between colors (hereinafter referred to as “ Called “color bleed”) and the image was not satisfactory.
[0004]
As means for solving the above problems, Japanese Patent Application Laid-Open No. 5-202328 discloses an invention in which an ink containing a chemical dye material having at least one carboxyl group is applied after a polyvalent metal salt solution is applied to a recording material. ing. According to this invention, it is said that an insoluble complex is formed from a polyvalent metal ion and a dye, and as a result, a high-quality image having water resistance and no color bleeding can be obtained.
[0005]
Japanese Patent Laid-Open No. 64-63185 discloses that a colorless or light-colored leading liquid and ink are attached to a recording material by the same inkjet method, and the dot diameter of the recording material is larger than the dot diameter of the ink. Japanese Patent Application Laid-Open No. 7-195823 proposes a method of printing a precursor with the same or lower resolution at all points where black or color appears, and adjusting the tone of the recording medium.
[0006]
[Problems to be solved by the invention]
However, the above prior art has the following problems.
[0007]
First, since the amount of adhesion of the leading liquid or precursor (hereinafter collectively referred to as “first liquid”) and ink to the total recording medium increases, so-called “paper” is used for printing on plain paper. Wrinkles occur. This is particularly noticeable when the first liquid and ink are water-based and the recording medium is thin paper.
[0008]
Second, since the consumption of the first liquid increases, the running cost of the recording apparatus increases.
[0009]
The present invention is to solve these problems, and an object of the present invention is to provide an ink jet recording apparatus and a recording method which have no printing unevenness and which bleed even when recycled paper is used and which do not cause color bleeding. is there.
[0010]
Another object of the present invention is to provide an ink jet recording apparatus and a recording method capable of obtaining a good printed matter free from paper wrinkles.
[0011]
[Means for Solving the Problems]
The ink jet recording method of the present invention is an ink jet recording method in which a first liquid containing a polyvalent metal salt is attached to a recording medium, and then an ink composition is printed on the recording medium. The number of adhering parts of one liquid is smaller than the printed part of the ink composition, and the number of dots of the first liquid is recorded to be smaller than the number of dots of the ink composition, and a plurality of adjacent dots are the same color ink. When formed by the composition, the ink is recorded such that there are dots of the ink composition in which the first liquid does not adhere to the base in the plurality of dots, and the first liquid does not adhere to the base An ink composition in which at least one first liquid adheres to a base around dots of the composition is recorded.
[0012]
An ink jet recording method in which a first liquid comprising a polyvalent metal salt is attached to a recording medium, and then an ink composition is printed on the recording medium, wherein the attached portion of the first liquid in the recording medium is An ink composition in which the number of dots of the first liquid is less than the number of dots printed by the ink composition and the number of dots of the ink composition is smaller than the number of dots of the ink composition, and the recording image formed by a plurality of adjacent dots is the same color In this case, the first liquid is recorded only on the contour portion of the recorded image with the ink composition attached to the base.
[0014]
In addition, the ink jet recording method and apparatus of the present invention may use an ink composition containing a resin emulsion and / or an inorganic oxide colloid.
[0015]
The first liquid is usually adhered to the recording medium by being discharged from an ink jet head. A color coloring material can be added to the first liquid to make a color ink, or a light ink of the same color may be used.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the first liquid comprising the polyvalent metal salt used in the present invention, the ink composition, and the ink jet recording method and apparatus using them will be described.
[0017]
First metal The metal salt contained in the first liquid comprising the polyvalent metal salt used in the present invention is composed of a divalent or higher polyvalent metal ion and an anion that binds to these polyvalent metal ions, If it is soluble in water, it can be used. As specific examples, the polyvalent metal ions include divalent metal ions such as Ca 2+, Cu 2+, Ni 2+, Mg 2+, Zn 2+, and Ba 2+, and trivalent metal ions such as Al 3+, Fe 3+, and Cr 3+. Examples of the anion include Cl-, NO3-, I-, Br-, ClO3- and CH3COO-.
[0018]
As a preferred embodiment of the present invention, it is preferable to use a metal salt composed of Ca 2+ or Mg 2+. Ca2 + and Mg2 + are weakly acidic when the salt is dissolved in water. The ink-jet head is made of various materials including metal, but cannot discharge a strongly acidic liquid because metal parts are corroded. From such circumstances, it is preferable to use Ca 2+ and Mg 2+ as metal ions. Note that the above description does not mean that other polyvalent metal ions cannot be used in the present invention, and can be used as long as the head has excellent acid resistance, and is as good as a salt containing Ca 2+ and Mg 2+ ions. Results can be obtained.
[0019]
According to a preferred embodiment of the present invention, the first liquid used in the present invention preferably further contains a wetting agent and / or a low boiling point organic solvent.
[0020]
The wetting agent prevents clogging of the head by preventing the first liquid from drying. The low boiling point organic solvent has an effect of shortening the drying time of the ink.
[0021]
Preferred examples of the wetting agent include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, propylene glycol, butylene glycol, 1,2,6-hexanetriol, thiodiglycol, hexylene glycol, glycerin, Polyhydric alcohols such as trimethylolethane and trimethylolpropane, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether , Triethylene glycol monobutyl ether, etc. Alkyl ethers of polyhydric alcohols, urea, 2-pyrrolidone, N- methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, triethanolamine and the like.
[0022]
Preferred examples of the low boiling point organic solvent include methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butanol, sec-butanol, tert-butanol, iso-butanol, n-pentanol and the like. . A monohydric alcohol is particularly preferable.
[0023]
Furthermore, according to a preferred aspect of the present invention, the first liquid preferably comprises a surfactant. Preferred examples of the surfactant include anionic surfactants (for example, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, ammonium salt of polyoxyethylene alkyl ether ether sulfate), nonionic surfactants (for example, polyoxyethylene alkyl ether ether sulfate). Oxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkylphenyl ether, polyoxyethylene alkylamine, polyoxyethylene alkylamide, etc.), and these may be used alone or in combination of two or more. Can be used in combination. Particularly preferred specific examples include acetylene glycol (Otsufin Y and Surfinol 82, 104, 440, 465, and 485 (all manufactured by Air Product and Chemical Inc.)).
[0024]
Ink composition The coloring component contained in the ink composition of the present invention may be a dye or a pigment.
[0025]
As dyes, various dyes that are usually used for inkjet recording, such as direct dyes, acid dyes, food dyes, basic dyes, reactive dyes, disperse dyes, vat dyes, soluble vat dyes, and reactive disperse dyes, can be used. it can.
[0026]
As the pigment, inorganic pigments and organic pigments can be used without any particular limitation. As the inorganic pigment, in addition to titanium oxide and iron oxide, carbon black produced by a known method such as a contact method, a furnace method, or a thermal method can be used. Organic pigments include azo dyes (including azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments), polycyclic pigments (for example, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazines). Pigments, thioindigo pigments, isoindolinone pigments, quinofullerone pigments, etc.), dye chelates (for example, basic dye chelate, acid dye chelate, etc.), nitro pigments, nitroso pigments, aniline black, and the like.
[0027]
According to a preferred embodiment of the present invention, the pigment is preferably added to the ink as a pigment dispersion obtained by dispersing the pigment in an aqueous medium with a dispersant. As a preferable dispersant, a known dispersant used for preparing a conventionally known pigment dispersion, for example, a polymer dispersant or a surfactant can be used.
[0028]
The amount of the pigment added to the ink composition is preferably about 0.5 to 25% by weight, more preferably about 2 to 15% by weight.
[0029]
According to a preferred embodiment of the present invention, it is preferable to add a resin emulsion and / or an inorganic oxide colloid to the ink composition. These have the effect of suppressing the penetration of the coloring component by the interaction with the polyvalent metal ion and further promoting the fixing to the recording medium. In addition, depending on the type, there is an effect that a film is formed on the recording medium and the printed sheet is also improved in abrasion resistance.
[0030]
The resin emulsion added to the ink composition means an emulsion in which the continuous phase is water and the dispersed phase is the following resin component. Examples of the resin component in the dispersed phase include acrylic resins, vinyl acetate resins, styrene-butadiene resins, vinyl chloride resins, acrylic-styrene resins, butadiene resins, and styrene resins.
[0031]
This resin is preferably a polymer having both a hydrophilic part and a hydrophobic part. The particle size of these resin components is not particularly limited as long as an emulsion is formed, but is preferably about 150 nm or less, more preferably about 5 to 100 nm.
[0032]
These resin emulsions can be obtained by mixing resin particles in water, optionally with a surfactant. For example, an acrylic resin or styrene-acrylic resin emulsion can be obtained by adding (meth) acrylic acid ester or styrene, (meth) acrylic acid ester, and optionally (meth) acrylic acid ester, and a surfactant to water. It can be obtained by mixing. The mixing ratio of the resin component and the surfactant is usually preferably about 10: 1 to 5: 1. When the amount of the surfactant used is less than the above range, it is difficult to form an emulsion, and when it exceeds the above range, the water resistance of the ink tends to be lowered or the penetrability tends to deteriorate. The surfactant is not particularly limited, but preferable examples include anionic surfactants (for example, sodium dodecyl benzene sulfonate, sodium laurate, ammonium salt of polyoxyethylene alkyl ether sulfate), nonionic surfactants ( For example, polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl amine, polyoxyethylene alkyl amide, etc.). A mixture of seeds or more can be used.
[0033]
Further, the ratio of the resin and water as the dispersed phase component is 60 to 400 parts by weight, preferably 100 to 200 parts by weight with respect to 100 parts by weight of the resin.
[0034]
Commercially available resin emulsions can also be used. For example, Microgel E-1002, E-5002 (styrene-acrylic resin emulsion, manufactured by Nippon Paint Co., Ltd.), Boncoat 4001 (acrylic resin emulsion, Dainippon) Manufactured by Ink Chemical Co., Ltd.) Boncoat 5454 (styrene-acrylic resin emulsion, manufactured by Dainippon Ink & Chemicals, Inc.), SAE-1014 (styrene-acrylic resin emulsion, manufactured by Nippon Zeon Co., Ltd.), Cybinol SK-200 ( Acrylic resin emulsion, manufactured by Seiden Chemical Co., Ltd.).
[0035]
The resin emulsion used in the present invention is preferably contained so that the resin component is 0.1 to 40% by weight of the ink composition, and two or more kinds may be added or mixed with an inorganic oxide colloid. May be used.
[0036]
Specific examples of the inorganic oxide colloid added to the ink composition include colloidal silica and alumina colloid. Various types of these are commercially available as colloidal solutions in which ultrafine particles such as SiO2 and Al2O3 are dispersed in water or an organic solvent. As examples of commercially available products, those in which the dispersion solvent is water, methanol, 2-propanol, n-propanol, xylene, or the like, and the particle size of particles such as SiO2 and Al2O3 is generally 5 to 100 nm. In many cases, the pH of the inorganic oxide colloidal solution is adjusted to be acidic or alkaline rather than neutral. This is because the stable dispersion region of the inorganic oxide colloid exists on the acidic side or alkaline side. When adding to the ink, the pH of the stable dispersion region of the inorganic oxide colloid and the pH of the ink should be taken into account. There is a need to.
[0037]
The dispersion solvent, particle system, and pH of the inorganic oxide colloid solution used in the present invention are not particularly limited as long as the dispersion solvent is compatible with the ink composition and the inorganic oxide particles are stably dispersed. All are usable.
[0038]
It is preferable to add the inorganic oxide colloid so that the inorganic oxide is 0.1 to 40% by weight of the ink composition, and two or more kinds may be added, or the inorganic oxide colloid may be used by mixing with a resin emulsion. good.
[0039]
According to a preferred embodiment of the present invention, the ink composition used in the present invention preferably further contains a wetting agent and / or a low boiling point organic solvent and / or a surfactant. These preferable examples are the same as those described in the section of the first liquid.
[0040]
The addition amount of the wetting agent is 0.5 to 40% by weight, preferably 2 to 20% by weight of the ink. The low-boiling organic solvent is added in an amount of 0.5 to 10% by weight, preferably 1.5 to 6% by weight of the ink.
[0041]
In addition, you may add a pH adjuster, antiseptic | preservative, a fungicide, etc. as needed.
[0042]
Inkjet Recording Apparatus The inkjet recording apparatus according to the present invention will be described in detail below with reference to the drawings.
[0043]
The ink jet recording apparatus of FIG. 1 is an embodiment in which an ink composition and a first liquid are stored in a tank, and the ink composition and the first liquid are supplied to a recording head via an ink tube. That is, the recording head 1 and the ink tank 2 are communicated with each other through the ink tube 3. Here, the inside of the ink tank 2 is partitioned, and an ink composition, and in some cases, a plurality of color ink composition rooms and a first liquid room are provided.
[0044]
The recording head 1 moves along a carriage 4 by a timing belt 6 driven by a motor 5. On the other hand, the paper 7 as a recording medium is placed at a position facing the recording head 1 by a platen 8 and a guide 9. In this embodiment, a cap 10 is provided. A suction pump 11 is connected to the cap 10 to perform a so-called cleaning operation. The sucked ink composition is stored in the waste ink tank 13 through the tube 12.
[0045]
An enlarged view of the nozzle surface of the recording head 1 is shown in FIG. A portion indicated by 1b is a nozzle surface of the first liquid, and a nozzle 21 for discharging the first liquid is provided in the vertical direction. On the other hand, the portion denoted by 1c is the nozzle surface of the ink composition, and the yellow ink composition, magenta ink composition, cyan ink composition and black ink composition are respectively supplied from the nozzles 22, 23, 24 and 25. Discharged.
[0046]
Further, an ink jet recording method using the recording head shown in FIG. 2 will be described with reference to FIG. The recording head 1 moves in the direction of arrow A. During the movement, the first liquid is discharged from the nozzle surface 1 to form a band-shaped first liquid adhesion region 31 on the recording medium 7. Next, the recording medium 7 is transported by a predetermined amount in the paper feed direction arrow B. Meanwhile, the recording head 1 moves in the direction opposite to the arrow A in the figure and returns to the left end position of the recording medium 7. Then, the ink composition is printed on the first liquid adhesion area where the first liquid has already adhered, and the printing area 32 is formed.
[0047]
Further, as shown in FIG. 4, in the recording head 1, all the nozzles can be arranged in the horizontal direction. In the figure, 41a and 41b are discharge nozzles for the first liquid, and the yellow ink composition, the magenta ink composition, the cyan ink composition, and the black ink composition are discharged from the nozzles 42, 43, 44, and 45, respectively. Is done. In the recording head of such a mode, printing can be performed in both the forward path and the backward path in which the recording head 1 reciprocates on the carriage, and at a higher speed than when the recording head shown in FIG. 2 is used. Printing can be expected.
[0048]
Furthermore, in some inkjet recording apparatuses of the present invention, the ink composition is replenished by replacing a cartridge that is an ink tank. The ink tank may be integrated with the recording head.
[0049]
A preferred example of an ink jet recording apparatus using such an ink tank is shown in FIG. In the figure, the same members as those in the apparatus of FIG. In the embodiment of FIG. 5, the recording heads 1a and 1b are integrated with the ink tanks 2a and 2b. The recording head 1a or 1b is assumed to eject the ink composition and the first liquid, respectively. The printing method may be basically the same as that of the apparatus shown in FIG. In this embodiment, the recording head 1a, the ink tank 2a, and the recording heads 1a and 2b move together on the carriage 4.
[0050]
Recording Method The inkjet recording method according to the present invention will be described below in detail with reference to the drawings.
[0051]
According to a preferred aspect of the present invention, in order to reduce the occurrence of paper wrinkles on the recording medium, when the recording head as shown in FIG. 2 is used, the first liquid discharged from the nozzle 21 is the nozzles 22, 23, The amount of ink discharged from 24 and 25 is preferably less. When the recording head as shown in FIG. 4 is used, the first liquid ejected from the nozzles 41a and 41b is preferably smaller than the ink ejected from the nozzles 42, 43, 44, and 45.
[0052]
For example, when the recording image shown in FIG. 6 is formed in a single color, the above-described aspect can be implemented by the following method.
[0053]
FIG. 7 shows a first embodiment of the recording method of the present invention. According to this embodiment, the dot D1 formed by the ink composition having the first liquid adhered to the base and the first liquid adhered. The dots D2 by the ink composition that has not been printed are alternately recorded, and the dots adjacent to the dots D2 to which the first liquid is not attached are always recorded as the dots D1 to which the first liquid has been attached.
[0054]
According to this embodiment, it is possible to prevent the recording image from bleeding and to reduce the discharge amount of the first liquid from the ink discharge amount, thereby preventing the occurrence of paper wrinkles.
[0055]
FIG. 8 shows a second embodiment of the recording method of the present invention. According to this embodiment, the contour of the recording image is formed by the dots D1 having the first liquid adhered to the ground, and the inside thereof is shown. Is printed with dots to which the first liquid is not attached.
[0056]
According to this embodiment, it is possible to suppress bleeding at the contour portion of the recorded image, and to reduce the discharge amount of the first liquid below the ink discharge amount, thereby preventing the occurrence of paper wrinkles.
[0057]
In this embodiment, D2 can be selectively made into dots with the first liquid adhering to the base as required.
[0058]
In the above-described embodiment, a recording image recorded in a single color has been described. However, when adjacent dots have the same color, the same effect can be obtained by appropriately applying the recording method.
[0059]
In addition, when image areas of different colors are adjacent to each other, the mixed color bleeding can be effectively suppressed by recording the first liquid with dots of the ink composition attached to the base only in the adjacent portions.
[0060]
Furthermore, according to a preferred aspect of the present invention, the apparatus shown in FIG. 9 is used to have the ink discharge dot number detecting means for counting the number of adhered dots of the first liquid and the ink composition. The ejection dot control means for making the number of adhered dots smaller than the number of adhered dots of the ink composition can be used to control the number of adhered dots of the first liquid to be smaller than the number of adhered dots of the ink composition.
[0061]
【Example】
EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
[0062]
First, the example of the 1st liquid which contains the polyvalent metal salt used for this invention is shown below.
[0063]
1st liquid magnesium nitrate hexahydrate 25% by weight
10% by weight of triethylene glycol monobutyl ether
Glycerin 20% by weight
Triethanolamine 0.9% by weight
Pure water (remaining amount)
The above components were mixed, stirred at room temperature for 1 hour, and then the composition was suction filtered with a 5 μm membrane filter to prepare a first solution.
[0064]
Next, examples of inks used in the present invention are shown below.
[0065]
Color ink 2% by weight
Styrene-acrylic acid copolymer 0.4% by weight
(Dispersant)
Snowtex S 5% by weight
(Colloidal silica, SiO2 content 30%, manufactured by Nissan Chemical)
Boncoat 4001 5% by weight
(Acrylic resin emulsion, resin component 50%, MFT = 5 ° C, manufactured by Dainippon Ink & Chemicals, Inc.)
Sucrose 0.7% by weight
Maltitol 6.3% by weight
Glycerin 10% by weight
2-pyrrolidone 2% by weight
4% by weight of ethanol
Pure water (remaining amount)
Here, the color pigment is yellow: C.I. I. Pigment Yellow 17
Magenta: C.I. I. PigmentRed122
Cyan: C.I. I. PigmentBlue 15-3
Was used. The color pigment and the dispersant were mixed and dispersed in a sand mill (manufactured by Yasukawa Seisakusho) with glass beads (direct 1.7 mm, 1.5 times the weight of the mixture (weight)) for 2 hours. Thereafter, the glass beads were removed, other components were added, and the mixture was stirred at room temperature for 20 minutes. Filtration through a 5 μm membrane filter gave an ink for inkjet recording.
[0066]
Printing evaluation test evaluation 1: Printing quality (bleeding) and paper wrinkle generation test Using an inkjet printer MJ700V2C (manufactured by Seiko Epson Corporation), the black liquid is filled with the first liquid, and the color head is filled with the color ink, and then discharged. Both amounts were adjusted to 0.07 μg / dot.
[0067]
As shown in FIG. 6, the recorded image is formed at a density of 360 dpi (360 dots per inch), and the cyan portion and the blue portion (the portion where both cyan and magenta adhere) are Xerox P paper (copy paper manufactured by Xerox Corporation). The printing was carried out by the method according to the following example.
[0068]
Example 1 (Recording method 1)
As shown in FIG. 7, the dot D1 to which the first liquid adhered and the dot D2 to which the first liquid did not adhere were recorded. In this example, the ratio of the dot D1 with the first liquid attached to the dot D2 with no first liquid attached was recorded to be 1: 1.
[0069]
Example 2 (Recording method 2)
As shown in FIG. 8, the dot D1 to which the first liquid was attached was recorded only on the outline portion of the recorded image, and the other portions were recorded with dots to which the first liquid was not attached.
[0070]
Example 3
The recorded image of FIG. 6 was recorded with dots to which the first liquid was attached.
[0071]
The results were as shown in Table 1. In the table (smear)
For clear prints without blurring-○
When whisker-like blurring occurs-△
When blurring occurs so that the outline of the character is not clear-×
(Paper wrinkles)
Does not occur-○
Occurred − ×
[0072]
[Table 1]

[0073]
As is clear from Table 1, in Examples 1 and 2, good printed matter without paper wrinkles was obtained. In particular, in Example 2, a clear print having no blur was obtained. The printing in Example 2 was at a practical level although whisker-like bleeding occurred. On the other hand, in Example 3, although there was no blur and clear printing was obtained, paper wrinkles occurred.
[0074]
【The invention's effect】
As described above, according to the present invention, the first liquid containing the polyvalent metal salt is adhered to the recording medium, and the adhesion portion of the first liquid is made smaller than the adhesion portion of the ink composition. A good print with high print quality and no paper wrinkles can be obtained. In particular, the number of first liquid and / or ink composition adhering dots is counted, and the first liquid is present so that only the dots to which the ink composition of the same color adheres to all the adjacent dots do not adhere to the first liquid. According to the apparatus in which the number of dots adhered to the liquid is less than the number of dots adhered to the ink composition, it is possible to maintain printing that does not cause whiskers.
[0075]
Further, according to the present invention, since the consumption of the first liquid can be saved, not only the running cost can be reduced, but also the capacity of the cartridge in which the tank of the first liquid and the ink tank are integrated is reduced. It is possible to reduce the size.
[0076]
Furthermore, according to the present invention, by controlling the reduction amount of the number of attached dots of the first liquid, it becomes possible to express a flexible gradation, which is advantageous for high printing quality.
[Brief description of the drawings]
FIG. 1 is a diagram showing an ink jet recording apparatus according to the present invention. In this embodiment, a recording head and an ink tank are independent from each other, and an ink composition and a first liquid are supplied to the recording head through an ink tube. .
FIG. 2 is an enlarged view of a nozzle surface of a recording head, where 1b is a nozzle surface of a first liquid and 1c is a nozzle surface of an ink composition.
FIG. 3 is a diagram illustrating ink jet recording using the recording head of FIG. 2; In the figure, reference numeral 31 denotes a first liquid adhesion area, and 32 denotes a printing area where the ink composition is printed on the first liquid adhered.
FIG. 4 is a diagram showing another aspect of the recording head according to the present invention, in which all the discharge nozzles are arranged in the horizontal direction.
FIG. 5 is a diagram showing an ink jet recording apparatus according to the present invention. In this embodiment, a recording head and an ink tank are integrated.
FIG. 6 is a diagram illustrating a recorded image of an example.
FIG. 7 is a diagram for explaining a first embodiment of a recording method according to the present invention.
FIG. 8 is a diagram for explaining a second embodiment of the recording method according to the present invention.
FIG. 9 is a diagram for explaining control of the ejection amount of the recording head that ejects the first liquid according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Recording head 2 Ink tank 3 Ink tube 21 1st liquid discharge nozzle 22, 23, 24, 25 Ink composition discharge nozzle 31 1st liquid adhesion area 32 Print area

Claims (3)

An ink jet recording method in which a first liquid comprising a polyvalent metal salt is attached to a recording medium, and then an ink composition is printed on the recording medium,
The first liquid adhering part in the recording medium is less than the printing part by the ink composition, and the number of dots of the first liquid is recorded to be smaller than the number of dots of the ink composition,
When a plurality of adjacent dots are formed of the same color ink composition, it is recorded that there is a dot of the ink composition in which the first liquid is not attached to the base in the plurality of dots,
Furthermore, an ink composition in which at least one first liquid adheres to the base is recorded around dots of the ink composition in which the first liquid does not adhere to the base. An ink jet recording method in which a first liquid comprising a polyvalent metal salt is attached to a recording medium, and then an ink composition is printed on the recording medium,
The first liquid adhering part in the recording medium is less than the printing part by the ink composition, and the number of dots of the first liquid is recorded to be smaller than the number of dots of the ink composition,
When a recording image formed by a plurality of adjacent dots is formed of an ink composition of the same color, the first liquid is recorded only on the contour portion of the recording image by the ink composition attached to the ground. Ink jet recording method.   The inkjet recording method according to claim 1, wherein the ink composition contains a resin emulsion and / or an inorganic oxide colloid.

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