JP2004050412A - Ink jet recorder and ink jet recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of nonuniformity in color caused by printing order of inks. <P>SOLUTION: The inkjet recorder is provided with at least three color inks including cyan, magenta and yellow color inks and arranged to perform printing by superposing the color inks sequentially on the surface of a recording medium. The inkjet recorder comprises a means for performing printing on the surface of the recording medium while superposing at least the cyan color ink between the magenta color ink and yellow color ink. <P>COPYRIGHT: (C)2004,JPO

Description

【０１０８】
【表２】

【０１０９】
（評価方法）
表２に示す評価手順および評価基準の詳細を以下に説明する。
＜色ムラ＞
シアン、マゼンタ、イエロ−で構成される所謂プロセスブラックのパタ−ンをインクの印字順が異なるように重ね印字したサンプルを作成した。
これを、エックスライト９３８（エックスライト社製）を用いて色相（明度Ｌ^＊、彩度ａ^＊／ｂ^＊）を測定した。尚、色ムラを判断する基準としては、下式（１）から導かれるΔＥを用いた。
【０１１０】
【数１】

【０１１１】
〔但し、式（１）において、ΔＬ^＊、Δａ^＊、Δｂ^＊は、試作ヘッドを順方向に走査した場合と逆方向に走査した場合とにおける色相測定結果のＬ^＊、ａ^＊、ｂ^＊の差を示す。〕
【０１１２】
なお色ムラは以下の評価基準にて評価した。
−評価基準−
○…ΔＥが５未満
△…ΔＥが５以上１０未満
×…ΔＥが１０以上
【０１１３】
＜光学濃度＞
１００％カバレッジパタ−ンを各色のインク毎に印字し、エックスライト４０４（エックスライト社製）を用いて光学濃度を測定した。なお、光学濃度は以下の基準にて評価した。
【０１１４】
−評価基準−
○…黒色のカバレッジパターンの光学濃度が１．４以上、且つ、各々のカラー色（シアン、マゼンタ、および、イエロー）のカバレッジパターンの光学濃度が１．１以上
△…黒色のカバレッジパターンの光学濃度が１．３以上１．４未満、且つ、各々のカラー色のカバレッジパターンの光学濃度が１．０以上１．１未満
×…黒色のカバレッジパターンの光学濃度が１．３未満、および／または、各々のカラー色のカバレッジパターンの光学濃度が１．０未満
【０１１５】
＜色間滲み＞
色間滲みの評価は、黒色、カラー色、および、４つのインクの重ね合わせによる色を用い、異なる色が重ならないように相互に隣接するパタ−ンを印字し、境界部分の滲み度合いを予め定めておいた限度見本に照合し、官能評価を行なった。なお、色間滲みは以下の基準にて評価した。
−評価基準−
○…色間滲みが少ないもの。
△…色間滲みは発生しているが、許容レベルのもの。
×…色間滲みが激しく、許容範囲外のもの。
【０１１６】
＜滲み＞
黒色、カラー色、あるいは、４つのインクの重ね合わせによる色からなる細線パタ−ンを印字し、印字部の滲み度合いを限度見本に照合し、官能評価を行なった。なお、滲みは以下の基準にて評価した。
−評価基準−
○…滲みが少ないもの。
△…滲みは発生しているが、許容レベルのもの。
×…滲みが激しく、許容範囲外のもの。
【０１１７】
＜乾燥時間＞
１００％カバレッジパタ−ンをＦＸ−Ｐ紙に印字してから所定の時間経過後に、この印字パターンが形成された面に別のＦＸ−Ｐ紙を１．９×１０^４Ｎ／ｍ^２の荷重で押し当てる。この時、押し当てたＦＸ−Ｐ紙側にインクが転写されなくなる時間を乾燥時間とした。なお、乾燥時間は以下の基準にて評価した。
−評価基準−
○…乾燥時間が３秒未満。
△…乾燥時間が３秒以上１０秒未満。
×…乾燥時間が１０秒以上。
【０１１８】
【発明の効果】
以上に説明したように本発明によれば、インクの印字順による色ムラの発生を防止することができるインクジェット記録装置、およびインクジェット記録方法を提供することを課題とする。
【図面の簡単な説明】
【図１】本発明のインクジェット記録装置の外観の構成の一例を模式的に示した斜視図である。
【図２】図１に示すインクジェット記録装置内部の基本構成の一例を模式的に示した斜視図である。
【図３】図２に示すインクジェット記録装置に用いられる走査型ヘッドの構成について示した模式図である。
【符号の説明】
１　記録媒体
２　搬送ローラー
２’　搬送ローラー
３　記録ヘッド
４　印字用液体収納部
５　走査型ヘッド
６　外部カバー
７　給紙トレイ
８　画像形成部
９　給電信号ケーブル
１０　キャリッジ
１１　走査線（ガイドロット）
１２　タイミングベルト
１３　駆動プーリー
１３’　駆動プーリー
１４　メンテナンスステーション
１５　チューブ
１６　排紙トレイ
３１，３２，３３，３４，３５，３６　記録ヘッド
３１’、３２’、３３’、３４’、３５’、３６’　ノズル面
４１、４２、４３、４４、４５、４６　印字用液体収納部
６０　ノズル
１００　インクジェット記録装置（プリンター）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inkjet recording apparatus and an inkjet recording method.
[0002]
[Prior art]
The so-called ink jet method, which discharges ink such as liquid or molten solid from an ink discharge port such as a nozzle, a slit or a porous film, has features such as small size and low cost, and is used in many printers. . Among these inkjet methods, a piezo inkjet method that uses a deformation of a piezoelectric element to eject ink, or a thermal inkjet method that uses a boiling phenomenon of ink due to thermal energy is widely used from the viewpoint of high resolution and high-speed printing. Have been. On the other hand, an ink jet printer using an ink jet method is used not only for printing on so-called paper such as plain paper and ink jet paper, but also for printing on a film such as an OHP sheet or a cloth.
[0003]
At present, high-speed printing and high image quality are important issues in ink jet printers.
First, so-called reciprocating batch printing is known as one of printing methods for realizing high-speed printing. This is a printing method for performing printing in both the forward and reverse directions when a scanning head (hereinafter, may be abbreviated as “head”) containing ink of each color reciprocates on a scanning line. However, in this reciprocating batch printing, the printing order of the inks is reversed according to the head scanning direction, so that in an image printed by overlapping a plurality of colors of ink, the color hue changes according to the so-called printing order in which the hue changes according to the head scanning direction. I do. Although the mechanism of this color unevenness has not been clarified, it is considered to be caused by the permeability of the ink into the paper, the overlap between the inks, and the like.
[0004]
Further, as one of methods for achieving high image quality, a method using a liquid composition other than ink and the like is known. For example, Japanese Patent No. 2667401 discloses that after a liquid containing a compound having a cationic group is attached to the surface of a recording medium, the liquid penetrates the recording medium, and immediately after a volatile component of the liquid is volatilized, A method for forming an image by attaching an ink containing an anionic dye has been disclosed. This method improves the image quality such as resolution, sharpness, sharpness, and image density in addition to the drying, water resistance, and light resistance of the printed image. The purpose is to improve the performance.
[0005]
In a conventional recording method using inks of two or more colors, when images of secondary colors or more are printed by reciprocal batch printing, color unevenness due to the printing order tends to be deteriorated. Although this mechanism has not been clarified, it is presumed that this is because two or more color materials are stacked in a layer structure on the recording medium, and the hue of the ink printed last increases.
As described above, in the ink jet printer that performs the reciprocating batch printing using the conventional scanning head, color unevenness due to the printing order has occurred. Further, it has not been possible to prevent the occurrence of color unevenness, to achieve high image quality such as optical density, bleeding, and intercolor bleeding, and to shorten the drying time.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to solve the above problems. That is, an object of the present invention is to provide an ink jet recording apparatus and an ink jet recording method that can prevent the occurrence of color unevenness due to the printing order of ink.
[0007]
[Means for Solving the Problems]
The above object is achieved by the present invention described below. That is, the present invention
<1> An ink jet recording apparatus which includes inks of at least three colors including cyan, magenta, and yellow, and sequentially prints the inks on the surface of a recording medium for each color,
An ink jet recording apparatus comprising at least printing means for printing the ink in the order of magenta, cyan, and yellow, or in the order of yellow, cyan, and magenta.
[0008]
<2> The ink jet recording apparatus according to <1>, wherein the printing unit sequentially prints the inks after applying the ink aggregation liquid to the surface of the recording medium.
[0009]
<3> The printing unit uses ink of at least three colors including cyan, magenta and yellow, and corresponds to the ink of each color arranged in series on one scanning line in the scanning line direction. A first recording head corresponding to the cyan ink; a second recording head corresponding to the magenta ink; and a third recording head corresponding to the yellow ink. <1> The inkjet recording apparatus according to <1>, wherein the inkjet recording apparatus is disposed between the recording head and the recording head.
[0010]
<4> The printing means uses ink of at least three colors including cyan, magenta, and yellow and an ink aggregation liquid, which are arranged on one scanning line, and prints the scanning line direction on one scanning line. At least five recording heads corresponding to the inks of the respective colors and the ink aggregation liquid arranged in series with respect to each other, and at least the second recording head is disposed with respect to the first recording head. A fourth recording head corresponding to the ink aggregation liquid is disposed on a side opposite to the ink recording liquid, and the ink is disposed on a side opposite to a side on which the third recording head is disposed with respect to the first recording head. The inkjet recording apparatus according to <3>, wherein a fifth recording head corresponding to the aggregation liquid is arranged.
[0011]
<5> The inkjet recording apparatus according to <1>, further including an ink including four colors of cyan, magenta, yellow, and black.
[0012]
<6> In an ink jet recording method for printing ink of at least three colors including cyan, magenta and yellow on a recording medium surface by sequentially superimposing the inks for each color,
An ink jet recording method characterized by printing the ink in the order of magenta, cyan, and yellow, or in the order of yellow, cyan, and magenta.
[0013]
<7> The inkjet recording method according to <6>, wherein, after applying the ink aggregation liquid to the surface of the recording medium, the ink is sequentially superimposed and printed.
[0014]
<8> The number of particles having a particle diameter of 5 μm or more contained in the mixed liquid obtained by mixing the ink and the ink aggregation liquid is 1 × 10 ³ The ink jet recording method according to <6>, wherein the number is equal to or more than the number per unit.
[0015]
<9> The ink jet recording method according to <8>, wherein the time change rate of the contact angle of the mixed liquid with the plain paper is 5 degrees / second or more.
[0016]
<10> The inkjet recording method according to <6>, wherein a surface tension of the ink is in a range of 25 mN / m or more and less than 40 mN / m.
[0017]
<11> The inkjet recording method according to <6>, wherein the viscosity of the ink is in a range of 1.5 to 6.0 mPa · s.
[0018]
<12> The inkjet recording method according to <6>, wherein the ink is printed by being superimposed on a recording medium surface by a thermal inkjet method.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention is broadly divided into an ink-jet recording method and an ink-jet apparatus and will be described in this order.
(Inkjet recording method)
Generally, when performing reciprocal batch printing in a printer having a scanning head, color unevenness occurs in the order in which color inks such as cyan, magenta, and yellow are superimposed on the surface of a recording medium. In particular, in a method in which a liquid such as a reaction liquid other than ink is used in combination for the purpose of improving image quality, color unevenness due to the printing order tends to be further deteriorated.
Therefore, as a result of the inventor's diligent study, when the recording head corresponding to the cyan ink is arranged between the recording head corresponding to the magenta ink and the recording head corresponding to the yellow ink, the printing order is Has been found to be able to prevent color unevenness due to
[0020]
The mechanism that can prevent the occurrence of such color unevenness has not been clarified. However, when an image of a secondary color or more, particularly an image of a tertiary color or more is formed, cyan ink has the largest contribution to hue. I believe that.
On the other hand, when the recording head corresponding to the cyan ink is not disposed between the recording head corresponding to the magenta ink and the recording head corresponding to the yellow ink, the three color inks sequentially formed on the recording medium are used. The arrangement of layers is divided into the following two patterns. That is, a pattern in which the cyan ink layer is provided as the ink layer closest to the recording medium surface side, and a pattern in which the cyan ink layer is provided as the ink layer farthest from the recording medium surface side. Therefore, the hue difference between these two patterns increases, and color unevenness occurs because these two patterns are alternately adjacent to each other on an image formed by reciprocal batch printing.
[0021]
On the other hand, when the recording head corresponding to the cyan ink is arranged between the recording head corresponding to the magenta ink and the recording head corresponding to the yellow ink in the arrangement as described above, In the arrangement of the three color ink layers sequentially formed in this order, the cyan ink layer is always provided between the other two color ink layers regardless of the printing order. For this reason, it is presumed that the influence of the cyan ink is reduced and color unevenness due to the printing order can be prevented. Based on the above findings, the present inventors have devised the present invention described below.
[0022]
That is, the ink jet recording method of the present invention is an ink jet recording method in which ink of at least three colors including cyan, magenta and yellow is sequentially superimposed and printed for each color on the surface of a recording medium. The printing is performed in the order of yellow, or in the order of yellow, cyan, and magenta.
[0023]
Therefore, according to the present invention, it is possible to prevent color unevenness due to the printing order of images when printing an image by overlaying ink on the surface of a recording medium.
In the case where one or more inks of colors other than cyan are used, printing can be performed in such a manner that they are interrupted in the printing order described above. For example, when black ink is used in addition to cyan, magenta, and yellow, the printing order performed in the order of yellow, cyan, and magenta is black, yellow, cyan, and magenta, and yellow, black, and cyan. , Magenta, yellow, cyan, black, and magenta, or yellow, cyan, magenta, and black.
[0024]
Further, the ink jet recording method of the present invention is preferably applied to an ink jet recording method of performing reciprocal batch printing using the scanning type head as described above, but is not limited thereto. The present invention can be applied to any ink jet recording method as long as it is an ink jet recording method in which ink of at least three colors including magenta and yellow is sequentially superimposed and printed for each color on the surface of a recording medium.
[0025]
Next, more preferred embodiments of the ink jet recording method of the present invention will be sequentially described.
That is, in the ink jet recording method of the present invention, it is preferable that after the ink aggregation liquid is applied to the surface of the recording medium, the ink be sequentially superimposed and printed. When the ink coagulation liquid is not applied, or when the ink coagulation liquid is applied after printing at least one or more inks at first, color unevenness or bleeding occurs in the printed image, or the optical density decreases. Or the drying time of the printed image may be prolonged. In the present invention, the term “ink aggregation liquid” means a liquid having at least an action to aggregate ink. The details of the ink aggregation liquid will be described later.
[0026]
In order to further ensure the above-described effects, the number of particles having a particle diameter of 5 μm or more contained in a mixed liquid obtained by mixing the ink and the ink aggregation liquid is 1 × 10 ³ Pcs / μL or more, preferably 5 × 10 ³ Pcs / μL or more, more preferably 1 × 10 ⁴ More preferably, it is not less than the number of particles / μL.
The number of particles having a particle diameter of 5 μm or more in the mixed solution is 1 × 10 ³ If the number is less than the number of particles / μL, color unevenness or bleeding may occur, or the optical density may decrease.
[0027]
The number of particles having a particle diameter of 5 μm or more in the liquid mixture was measured by mixing 2 μL of the liquid mixture obtained by mixing the ink and the ink aggregation liquid at a mass ratio of 1: 1 and stirring the mixture. ^TM The measurement was performed using a 770 Optical Particle Sizer (manufactured by Particle Sizing Systems).
In the measurement, the density of the coloring material was used as the density of the particles dispersed in the mixed liquid as the setting parameter to be input to the measuring device. The density of the coloring material can be determined by measuring the powder obtained by heating and drying the aqueous dye solution or pigment dispersion using a specific gravity meter or a specific gravity bottle.
[0028]
Further, it is preferable that the rate of change over time of the contact angle of the mixed solution with plain paper is 5 degrees / second or more. When the contact angle time change rate is less than 5 degrees / second, the drying time of the image formed on the recording medium immediately after printing may be long. In addition, the time change rate of the contact angle more accurately means a change rate that decreases with time, and the plain paper means P paper (manufactured by Fuji Xerox Co., Ltd.).
On the other hand, the time change rate of the contact angle is not particularly limited, but is preferably 10 degrees / second or less, and more preferably 9 degrees / second or less. If it exceeds 10 degrees / second, the optical density may decrease.
[0029]
The above-mentioned time change rate of the contact angle is obtained by dropping a mixed liquid obtained by mixing the ink and the ink aggregation liquid at a mass ratio of 1: 1 on the surface of plain paper (P paper, manufactured by Fuji Xerox Co., Ltd.). It was determined by measuring the change over time of the contact angle in the case of the above.
Using a FIBRO 1100 DAT MKII (manufactured by FIBRO system) as a measuring apparatus, 4.0 μl of the above-mentioned mixed solution was dropped on plain paper to measure the change over time of the contact angle. In this manner, the value obtained by dividing the amount of change in the contact angle from the start of measurement (immediately after dropping) to the lapse of 10 seconds by the measurement time (10 seconds) was determined as the time change rate of the contact angle. When the time change rate of the contact angle was large and the measurement was completed in less than 10 seconds from the start of the measurement, the time change rate of the contact angle from the start to the end of the measurement was determined.
[0030]
Next, the physical properties of the ink used in the inkjet recording method of the present invention will be described.
The surface tension of the ink used in the ink jet recording method of the present invention is preferably in the range of 25 mN / m to less than 40 mN / m, and more preferably in the range of 27.5 mN / m to less than 40 mN / m. More preferably, it is more than 30 mN / m and less than 37.5 mN / m.
If the surface tension is less than 25 mN / m, the penetration of the ink to the surface of the recording medium becomes faster, and color unevenness or bleeding may occur, or the optical density may decrease. Conversely, if it exceeds 40 mN / m, the permeation of the ink into the surface of the recording medium becomes slow, and solid density unevenness may occur.
[0031]
The viscosity of the ink is preferably in the range of 1.5 to 6.0 mPa · s, and more preferably in the range of 1.5 to 4.0 mPa · s.
When the viscosity of the ink was greater than 6.0 mPa · s, there were cases where the ejection properties of the ink were reduced and the reliability was reduced. On the other hand, when the viscosity of the ink is smaller than 1.5 mPa · s, it may not be possible to obtain a sufficient optical density. It is considered that this is because the penetrating power to the recording medium increases and the coloring material penetrates into the recording medium.
[0032]
Further, the ink jet system used in the ink jet recording method of the present invention is not particularly limited, but it is preferable to employ a thermal ink jet system from the viewpoint of the effect of reducing bleeding and intercolor bleeding. When a method other than the thermal ink jet method is used, bleeding and intercolor bleeding may occur.
The cause of such an improvement effect when the thermal ink jet system is used is not clear, but is presumed as follows. In other words, the viscosity of the ink immediately after being discharged from the nozzle is small because it is heated, but the viscosity of the ink rapidly increases because the temperature of the ink drops when it adheres to the recording medium surface, and the bleeding and color It is considered that inter-bleeding is improved.
[0033]
<Ink composition>
Next, components contained in the ink used in the ink jet recording method of the present invention, that is, coloring materials, polymer substances, water-soluble organic solvents, surfactants, and other additives will be described in this order.
[0034]
-Coloring materials (pigments and dyes)-
As the coloring material used in the present invention, any of pigments and dyes can be used. As the pigment, any of an organic pigment and an inorganic pigment can be used.
Examples of the black pigment include carbon black pigments such as furnace black, lamp black, acetylene black, and channel black. In addition to the three primary color pigments of black, cyan, magenta, and yellow, specific color pigments such as red, green, blue, brown, and white, metallic luster pigments such as gold and silver, colorless or light color extender pigments, and plastic pigments May be used. Alternatively, a newly synthesized pigment may be used.
[0035]
Specific examples of the black pigment include Raven 7000, Raven 5750, Raven 5250, Raven 5000 ULTRA II, Raven 3500, Raven 2000, Raven 1500, Raven 1250, Raven 1200, Raven 1190, Raven 1, Raven 10 and Raven 10 and Raven 10, Raven 10 and Raven 10 and Raven 10; Regal400R, Regal330R, Regal660R, Mogul L, Black Pearls L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400 and above Color Black FW1, Color Black FW2V, Color Black FW2V, Color Black FW200, Color Black ex S, Color Black Ex V, 140, Color Black Ex V, Color Black Ex V, Color Black Ex V, Color Black Ex V, Color Black V Ex. No. 6, Special Black 5, Special Black 4A, Special Black 4 (all manufactured by Degussa), 25, no. 33, no. 40, no. 47, no. 52, no. 900, No. 2300, MCF-88, MA600, MA7, MA8, MA100 (all manufactured by Mitsubishi Chemical Corporation) and the like, but are not limited thereto.
[0036]
Examples of cyan pigments include C.I. I. Pigment Blue-1, C.I. I. Pigment Blue-2, C.I. I. Pigment Blue-3, C.I. I. Pigment Blue-15, C.I. I. Pigment Blue-15: 1, C.I. I. Pigment Blue-15: 2, C.I. I. Pigment Blue-15: 3, C.I. I. Pigment Blue-15: 4, C.I. I. Pigment Blue-16, C.I. I. Pigment Blue-22, C.I. I. Pigment Blue-60, but not limited to these.
[0037]
Examples of magenta pigments include C.I. I. Pigment Red-5, C.I. I. Pigment Red-7, C.I. I. Pigment Red-12, C.I. I. Pigment Red-48, C.I. I. Pigment Red-48: 1, C.I. I. Pigment Red-57, C.I. I. Pigment Red-112, C.I. I. Pigment Red-122, C.I. I. Pigment Red-123, C.I. I. Pigment Red-146, C.I. I. Pigment Red-168, C.I. I. Pigment Red-184, C.I. I. Pigment Red-202 and the like, but are not limited thereto.
[0038]
Yellow pigments include C.I. I. Pigment Yellow-1, C.I. I. Pigment Yellow-2, C.I. I. Pigment Yellow-3, C.I. I. Pigment Yellow-12, C.I. I. Pigment Yellow-13, C.I. I. Pigment Yellow-14, C.I. I. Pigment Yellow-16, C.I. I. Pigment Yellow-17, C.I. I. Pigment Yellow-73, C.I. I. Pigment Yellow-74, C.I. I. Pigment Yellow-75, C.I. I. Pigment Yellow-83, C.I. I. Pigment Yellow-93, C.I. I. Pigment Yellow-95, C.I. I. Pigment Yellow-97, C.I. I. Pigment Yellow-98, C.I. I. Pigment Yellow-114, C.I. I. Pigment Yellow-128, C.I. I. Pigment Yellow-129, C.I. I. Pigment Yellow-138, C.I. I. Pigment Yellow-151, C.I. I. Pigment Yellow-154 and the like, but are not limited thereto.
[0039]
Further, a pigment which can be self-dispersed in water can be used as the pigment. The pigment that is self-dispersible in water is a pigment that has a large number of water-solubilizing groups on the surface of the pigment and is stably dispersed in water without the coexistence of a polymer dispersant.
Specifically, a surface modification treatment such as an acid / base treatment, a coupling agent treatment, a polymer graft treatment, a plasma treatment, an oxidation / reduction treatment or the like is performed on a pigment which is hardly soluble in water. Thereby, a pigment that can be self-dispersed in water is obtained.
[0040]
Such a water-dispersible pigment can be obtained by subjecting the above-listed pigments to a surface modification treatment, but commercially available pigments can also be used.
Examples of such commercially available self-dispersible pigments in water include Cab-o-jet-200, Cab-o-jet-300, IJX-253, IJX-266, IJX-444, and IJX manufactured by Cabot Corporation. -273, IJX-55, Microjet Black CW-1 and CW-2 manufactured by Orient Chemical Co., and also commercially available self-dispersion pigments such as self-dispersion pigments sold by Nippon Shokubai Co., Ltd. can be used.
[0041]
On the other hand, as the dye, any of a water-soluble dye and a disperse dye can be used.
Specific examples of the water-soluble dye include C.I. I. Direct Black-2, C.I. I. Direct Black-4, C.I. I. Direct Black-9, C.I. I. Direct Black-11, C.I. I. Direct Black-17, C.I. I. Direct Black-19, C.I. I. Direct Black-22, C.I. I. Direct Black-32, C.I. I. Direct Black-80, C.I. I. Direct Black-151, C.I. I. Direct Black-154, C.I. I. Direct Black-168, C.I. I. Direct Black-171, C.I. I. Direct Black-194, C.I. I. Direct Black-195,
C. I. Direct Blue-1, C.I. I. Direct Blue-2, C.I. I. Direct Blue-6, C.I. I. Direct Blue-8, C.I. I. Direct Blue-22, C.I. I. Direct Blue-34, C.I. I. Direct Blue-70, C.I. I. Direct Blue-71, C.I. I. Direct Blue-76, C.I. I. Direct Blue-78, C.I. I. Direct Blue-86, C.I. I. DirectBlue-112, C.I. I. Direct Blue-142, C.I. I. Direct Blue-165, C.I. I. Direct Blue-199, C.I. I. Direct Blue-200, C.I. I. Direct Blue-201, C.I. I. Direct Blue-202, C.I. I. Direct Blue-203, C.I. I. Direct Blue-207, C.I. I. DirectBlue-218, C.I. I. Direct Blue-236, C.I. I. Direct Blue-287, C.I. I. Direct Blue-307,
C. I. Direct Red-1, C.I. I. Direct Red-2, C.I. I. Direct Red-4, C.I. I. Direct Red-8, C.I. I. Direct Red-9, C.I. I. Direct Red-11, C.I. I. Direct Red-13, C.I. I. Direct Red-15, C.I. I. Direct Red-20, C.I. I. Direct Red-28, C.I. I. Direct Red-31, C.I. I. Direct Red-33, C.I. I. Direct Red-37, C.I. I. Direct Red-39, C.I. I. Direct Red-51, C.I. I. Direct Red-59, C.I. I. Direct Red-62, C.I. I. Direct Red-63, C.I. I. Direct Red-73, C.I. I. Direct Red-75, C.I. I. Direct Red-80, C.I. I. Direct Red-81, C.I. I. Direct Red-83, C.I. I. Direct Red-87, C.I. I. Direct Red-90, C.I. I. Direct Red-94, C.I. I. Direct Red-95, C.I. I. Direct Red-99, C.I. I. Direct Red-101, C.I. I. Direct Red-110, C.I. I. Direct Red-189, C.I. I. Direct Red-227, C.I. I. Direct Yellow-1, C.I. I. Direct Yellow-2, C.I. I. Direct Yellow-4, C.I. I. Direct Yellow-8, C.I. I. Direct Yellow-11, C.I. I. Direct Yellow-12, C.I. I. Direct Yellow-26, C.I. I. Direct Yellow-27, C.I. I. Direct Yellow-28, C.I. I. Direct Yellow-33, C.I. I. Direct Yellow-34, C.I. I. Direct Yellow-41, C.I. I. Direct Yellow-44, C.I. I. Direct Yellow-48, C.I. I. Direct Yellow-58, C.I. I. Direct Yellow-86, C.I. I. Direct Yellow-87, C.I. I. Direct Yellow-88, C.I. I. Direct Yellow-132, C.I. I. Direct Yellow-135, C.I. I. Direct Yellow-142, C.I. I. Direct Yellow-144, C.I. I. Direct Yellow-173,
C. I. Food Black-1, C.I. I. Food Black-2, C.I. I. Acid Black-1, C.I. I. Acid Black-2, C.I. I. Acid Black-7, C.I. I. Acid Black-16, C.I. I. Acid Black-24, C.I. I. Acid Black-26, C.I. I. Acid Black-28, C.I. I. Acid Black-31, C.I. I. Acid Black-48, C.I. I. Acid Black-52, C.I. I. Acid Black-63, C.I. I. Acid Black-107, C.I. I. Acid Black-112, C.I. I. Acid Black-118, C.I. I. Acid Black-119, C.I. I. Acid Black-121, C.I. I. Acid Black-156, C.I. I. Acid Black-172, C.I. I. Acid Black-194, C.I. I. Acid Black-208,
C. I. Acid Blue-1, C.I. I. Acid Blue-7, C.I. I. Acid Blue-9, C.I. I. Acid Blue-15, C.I. I. Acid Blue-22, C.I. I. Acid Blue-23, C.I. I. AcidBlue-27, C.I. I. Acid Blue-29, C.I. I. Acid Blue-40, C.I. I. Acid Blue-43, C.I. I. Acid Blue-55, C.I. I. Acid Blue-59, C.I. I. Acid Blue-62, C.I. I. Acid Blue-78, C.I. I. Acid Blue-80, C.I. I. Acid Blue-81, C.I. I. Acid Blue-83, C.I. I. Acid Blue-90, C.I. I. Acid Blue-102, C.I. I. Acid Blue-104, C.I. I. Acid Blue-111, C.I. I. Acid Blue-185, C.I. I. Acid Blue-249, C.I. I. Acid Blue-254,
C. I. Acid Red-1, C.I. I. Acid Red-4, C.I. I. Acid Red-8, C.I. I. Acid Red-13, C.I. I. Acid Red-14, C.I. I. Acid Red-15, C.I. I. Acid Red-18, C.I. I. Acid Red-21, C.I. I. Acid Red-26, C.I. I. Acid Red-35, C.I. I. Acid Red-37, C.I. I. Acid Red-52, C.I. I. Acid Red-110, C.I. I. Acid Red-144, C.I. I. Acid Red-180, C.I. I. Acid Red-249, C.I. I. Acid Red-257, C.I. I. Acid Red-289,
C. I. Acid Yellow-1, C.I. I. Acid Yellow-3, C.I. I. Acid Yellow-4, C.I. I. Acid Yellow-7, C.I. I. Acid Yellow-11, C.I. I. Acid Yellow-12, C.I. I. Acid Yellow-13, C.I. I. Acid Yellow-14, C.I. I. Acid Yellow-18, C.I. I. Acid Yellow-19, C.I. I. Acid Yellow-23, C.I. I. Acid Yellow-25, C.I. I. Acid Yellow-34, C.I. I. Acid Yellow-38, C.I. I. Acid Yellow-41, C.I. I. Acid Yellow-42, C.I. I. Acid Yellow-44, C.I. I. Acid Yellow-53, C.I. I. Acid Yellow-55, C.I. I. Acid Yellow-61, C.I. I. Acid Yellow-71, C.I. I. Acid Yellow-76, C.I. I. Acid Yellow-78, C.I. I. Acid Yellow-79, C.I. I. Acid Yellow-122 and the like.
[0042]
Specific examples of the disperse dye include C.I. I. Disperse Yellow-3, C.I. I. Disperse Yellow-5, C.I. I. Disperse Yellow-7, C.I. I. Disperse Yellow-8, C.I. I. Disperse Yellow-42, C.I. I. Disperse Yellow-54, C.I. I. Disperse Yellow-64, C.I. I. Disperse Yellow-79, C.I. I. Disperse Yellow-82, C.I. I. Disperse Yellow-83, C.I. I. Disperse Yellow-93, C.I. I. Disperse Yellow-100, C.I. I. Disperse Yellow-119, C.I. I. Disperse Yellow-122, C.I. I. Disperse Yellow-126, C.I. I. Disperse Yellow-160, C.I. I. Disperse Yellow-184: 1, C.I. I. Disperse Yellow-186, C.I. I. Disperse Yellow-198, C.I. I. Disperse Yellow-204, C.I. I. Disperse Yellow-224,
C. I. Disperse Orange-13, C.I. I. Disperse Orange-29, C.I. I. Disperse Orange-31: 1, C.I. I. Disperse Orange-33, C.I. I. Disperse Orange-49, C.I. I. Disperse Orange-54, C.I. I. Disperse Orange-66, C.I. I. Disperse Orange-73, C.I. I. Disperse Orange-119, C.I. I. Disperse Orange-163,
C. I. Disperse Red-1, C.I. I. Disperse Red-4, C.I. I. Disperse Red-11, C.I. I. Disperse Red-17, C.I. I. Disperse Red-19, C.I. I. Disperse Red-54, C.I. I. Disperse Red-60, C.I. I. Disperse Red-72, C.I. I. Disperse Red-73, C.I. I. Disperse Red-86, C.I. I. Disperse Red-92, C.I. I. Disperse Red-93, C.I. I. Disperse Red-126, C.I. I. Disperse Red-127, C.I. I. Disperse Red-135, C.I. I. Disperse Red-145, C.I. I. Disperse Red-154, C.I. I. Disperse Red-164, C.I. I. Disperse Red-167: 1, C.I. I. Disperse Red-177, C.I. I. Disperse Red-181, C.I. I. Disperse Red-207, C.I. I. Disperse Red-239, C.I. I. Disperse Red-240, C.I. I. Disperse Red-258, C.I. I. Disperse Red-278, C.I. I. Disperse Red-283, C.I. I. Disperse Red-311, C.I. I. Disperse Red-343, C.I. I. Disperse Red-348, C.I. I. Disperse Red-356, C.I. I. Disperse Red-362,
C. I. Disperse Violet-33, C.I. I. Disperse Blue-14, C.I. I. Disperse Blue-26, C.I. I. Disperse Blue-56, C.I. I. Disperse Blue-60, C.I. I. Disperse Blue-73, C.I. I. Disperse Blue-87, C.I. I. Disperse Blue-128, C.I. I. Disperse Blue-143, C.I. I. Disperse Blue-154, C.I. I. Disperse Blue-165, C.I. I. Disperse Blue-165: 1, C.I. I. Disperse Blue-176, C.I. I. Disperse Blue-183, C.I. I. Disperse Blue-185, C.I. I. Disperse Blue-201, C.I. I. Disperse Blue-214, C.I. I. Disperse Blue-224, C.I. I. Disperse Blue-257, C.I. I. Disperse Blue-287, C.I. I. Disperse Blue-354, C.I. I. Disperse Blue-365, C.I. I. Disperse Blue-368, C.I. I. Disperse Green-6: 1, C.I. I. Disperse Green-9 and the like.
[0043]
The content of the coloring material in the ink used in the ink jet recording method of the present invention is preferably in the range of 0.5 to 20% by mass, more preferably 1 to 10% by mass, based on the mass of the ink. .
When the content of the coloring material in the ink is less than 0.5% by mass, a sufficient optical density may not be obtained. When the content is more than 20% by mass, the ejection characteristics of the ink are unstable. It may be.
[0044]
-Polymer substance-
In the present invention, when a pigment that is self-dispersible in water is used as a pigment, to promote aggregation of the pigment when a coagulant is used, on the other hand, when a pigment that is not self-dispersible in water is used, May be added to disperse the polymer.
As the polymer substance, a nonionic compound, an anionic compound, a cationic compound, an amphoteric compound, or the like can be used. For example, a copolymer of a monomer having an α, β-ethylenically unsaturated group can be used.
[0045]
The monomers having an α, β-ethylenically unsaturated group include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, itaconic acid monoester, maleic acid, maleic acid monoester, fumaric acid, fumaric acid monoester. , Vinyl sulfonic acid, styrene sulfonic acid, sulfonated vinyl naphthalene, vinyl alcohol, acrylamide, methacryloxyethyl phosphate, bismethacryloxyethyl phosphate, methacryloxyethyl phenylacid phosphate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, styrene, α-methylstyrene , Styrene derivatives such as vinyltoluene, vinylcyclohexane, vinylnaphthalene, vinylnaphthalene derivatives, alkyl acrylates, acrylates Glycol ester, methacrylic acid alkyl esters, methacrylic acid phenyl ester, methacrylic acid cycloalkyl ester, crotonic acid alkyl ester, itaconic acid dialkyl esters, maleic acid dialkyl ester and the like.
[0046]
Examples of the polymer substance comprising a copolymer obtained by copolymerizing one or more kinds selected from monomers having an α, β-ethylenically unsaturated group include polyacrylic acid, polyvinyl alcohol, polyvinyl pyrrolidone, Styrene-styrene sulfonic acid copolymer, styrene-maleic acid copolymer, styrene-methacrylic acid copolymer, styrene-acrylic acid copolymer, vinylnaphthalene-maleic acid copolymer, vinylnaphthalene-methacrylic acid copolymer , Vinyl naphthalene-acrylic acid copolymer, alkyl acrylate-acrylic acid copolymer, methacrylic acid alkyl ester-methacrylic acid, styrene-methacrylic acid alkyl ester-methacrylic acid copolymer, styrene-acrylic acid alkyl ester-acryl Acid copolymer, styrene-methacrylate Examples include phenyl acrylate / methacrylic acid copolymer and styrene / cyclohexyl methacrylate-methacrylic acid copolymer.
[0047]
The mass average molecular weight of the polymer substance is preferably in the range of 2,000 to 15,000, and more preferably in the range of 3,500 to 10,000. If the weight average molecular weight of the polymer is less than 2,000, the pigment may not be stably dispersed in the ink. On the other hand, if the weight average molecular weight is more than 15,000, the viscosity of the ink may increase, and the ink ejection property may increase. May worsen.
[0048]
The content of the polymer substance in the ink is preferably in the range of 0.1 to 3% by mass, more preferably in the range of 0.15 to 2.5% by mass, and in the range of 0.2 to 2% by mass. Is more preferred. When the content is more than 3% by mass, the viscosity of the ink is increased, and the ejection characteristics of the ink may be unstable. On the other hand, if the content is less than 0.1% by mass, the dispersion stability of the pigment may be reduced.
[0049]
-Water-soluble organic solvent-
Examples of the water-soluble organic solvent include polyhydric alcohols, polyhydric alcohol derivatives, nitrogen-containing solvents, alcohols, and sulfur-containing solvents.
Specific examples of polyhydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,5-pentanediol, 1,2,6-hexanetriol, and glycerin.
Examples of polyhydric alcohol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and diglycerin. And ethylene oxide adducts.
Examples of the nitrogen-containing solvent include pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, and triethanolamine, and examples of the alcohol include alcohols such as ethanol, isopropyl alcohol, butyl alcohol, and benzyl alcohol.
Examples of the sulfur-containing solvent include thiodiethanol, thiodiglycerol, sulfolane, dimethyl sulfoxide and the like. In addition, propylene carbonate, ethylene carbonate and the like can be used.
[0050]
The water-soluble organic solvent contained in the ink is preferably at least one or more. The content of the water-soluble organic solvent is preferably in the range of 1 to 60% by mass, and more preferably in the range of 5 to 40% by mass.
When the content of the water-soluble organic solvent in the ink is less than 1% by mass, a sufficient optical density may not be obtained. When the content is more than 60% by mass, the viscosity of the ink increases, Ink ejection characteristics may be unstable.
[0051]
-Surfactant-
The ink used in the present invention may contain a surfactant. As the surfactant, a compound having a structure having both a hydrophilic part and a hydrophobic part in its molecule can be used, and an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant can be used. Any of surfactants and the like may be used. In addition, the above-described polymer substances can be used as the surfactant.
[0052]
Examples of the anionic surfactant include alkyl benzene sulfonate, alkyl phenyl sulfonate, alkyl naphthalene sulfonate, higher fatty acid salt, higher fatty acid ester sulfate, higher fatty acid ester sulfonate, and higher alcohol ether sulfuric acid. Ester salts and sulfonates, higher alkyl sulfosuccinates, higher alkyl phosphates, phosphates of higher alcohol ethylene oxide adducts and the like can be used. Specifically, dodecylbenzene sulfonate, kerylbenzene Sulfonate, isopropylnaphthalenesulfonate, monobutylphenylphenol monosulfonate, monobutylbiphenylsulfonate, monobutylbiphenylsulfonate, dibutylphenylphenol disulfonate, and the like. .
[0053]
Examples of the nonionic surfactant include, for example, polypropylene glycol ethylene oxide adduct, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, Examples include sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, fatty acid alkylolamides, acetylene glycol, oxyethylene adducts of acetylene glycol, aliphatic alkanolamides, glycerin esters, sorbitan esters, and the like.
[0054]
Examples of the cationic surfactant include tetraalkylammonium salts, alkylamine salts, benzalkonium salts, alkylpyridium salts, imidazolium salts and the like, for example, dihydroxyethylstearylamine, 2-heptadecenyl-hydroxyethylimidazoline, Lauryl dimethyl benzyl ammonium chloride, cetyl pyridinium chloride, stearamido methyl pyridium chloride and the like can be mentioned.
[0055]
In addition, silicone surfactants such as polysiloxane oxyethylene adducts, fluorine surfactants such as perfluoroalkyl carboxylate, perfluoroalkyl sulfonate and oxyethylene perfluoroalkyl ether, spiculisporic acid and rhamnolipid And biosurfactants such as lysolecithin can also be used.
[0056]
Generally, the solubilizing group of the coloring material is often anionic, and from the viewpoint of the dispersion stability of the coloring material, a nonionic surfactant or an anionic surfactant is preferable. Further, from the viewpoint of permeability control, acetylene glycol, oxyethylene adduct of acetylene glycol, polyoxyethylene alkyl ether, and the like are preferable.
[0057]
The amount of the surfactant added to the ink is preferably less than 10% by mass, more preferably 0.01 to 5% by mass, and even more preferably 0.01 to 3% by mass. When the addition amount is 10% by mass or more, the optical density and the storage stability of the ink containing a pigment as a coloring material may deteriorate.
[0058]
-Other additives-
In addition, for the purpose of controlling characteristics such as improvement of ink ejection properties, cellulose derivatives such as polyethyleneimine, polyamines, polyvinylpyrrolidone, polyethyleneglycol, ethylcellulose, carboxymethylcellulose, polysaccharides and derivatives thereof, other water-soluble polymers, acrylic polymer emulsions And polymer emulsions such as polyurethane emulsions, cyclodextrins, macrocyclic amines, dendrimers, crown ethers, urea and its derivatives, acetamide and the like.
[0059]
Further, in order to adjust the conductivity and pH, compounds of alkali metals such as potassium hydroxide, sodium hydroxide, and lithium hydroxide, ammonium hydroxide, triethanolamine, diethanolamine, ethanolamine, and 2-amino-2-methyl Nitrogen-containing compounds such as -1-propanol, compounds of alkaline earth metals such as calcium hydroxide, acids such as sulfuric acid, hydrochloric acid and nitric acid, and salts of strong acids and weak alkalis such as ammonium sulfate can be used.
In addition, if necessary, a pH buffer, an antioxidant, a fungicide, a viscosity modifier, a conductive agent, an ultraviolet absorber, a chelating agent, and the like can be added.
[0060]
<Ink aggregation liquid>
Next, the ink aggregation liquid used in the inkjet recording method of the present invention will be described below.
When the ink coagulation liquid contains a compound (hereinafter, abbreviated as “ink coagulant”) which, when mixed with the ink, reacts with a specific component in the ink to generate a product having poor water solubility. The composition is not particularly limited. However, it is preferable to select an ink coagulant according to the composition of the ink to be used.
[0061]
For an ink containing a coloring material having an anionic group on the surface, it is preferable to use an electrolyte compound or a cationic compound as an ink coagulant.
Examples of the electrolyte component of the electrolyte compound include lithium ions, sodium ions, alkali metal ions such as potassium ions, and aluminum ions, barium ions, calcium ions, copper ions, iron ions, magnesium ions, manganese ions, nickel ions, tin ions, Polyvalent metal ions such as titanium ion and zinc ion, hydrochloric acid, bromic acid, hydroiodic acid, sulfuric acid, nitric acid, phosphoric acid, thiocyanic acid, and acetic acid, oxalic acid, lactic acid, fumaric acid, fumaric acid, citric acid, Organic carboxylic acids such as salicylic acid and benzoic acid, and salts of organic sulfonic acids and the like can be mentioned.
[0062]
Specific examples of the ink flocculant containing the electrolytes listed above include lithium chloride, sodium chloride, potassium chloride, sodium bromide, potassium bromide, sodium iodide, potassium iodide, sodium sulfate, potassium nitrate, sodium acetate, and oxalic acid. Salts of alkali metals such as potassium, sodium citrate, potassium benzoate, and aluminum chloride, aluminum bromide, aluminum sulfate, aluminum nitrate, sodium aluminum sulfate, potassium aluminum sulfate, aluminum acetate, barium chloride, barium bromide, Barium iodide, barium oxide, barium nitrate, barium thionate, calcium chloride, calcium bromide, calcium iodide, calcium nitrite, calcium nitrate, calcium dihydrogen phosphate, calcium thiocyanate, benzoate Calcium, calcium acetate, calcium salicylate, calcium tartrate, calcium lactate, calcium fumarate, calcium citrate, copper chloride, copper bromide, copper sulfate, copper nitrate, copper acetate, iron chloride, iron bromide, iron iodide, sulfuric acid Iron, iron nitrate, iron oxalate, iron lactate, iron fumarate, iron citrate, magnesium chloride, magnesium bromide, magnesium iodide, magnesium sulfate, magnesium nitrate, magnesium acetate, magnesium lactate, manganese chloride, manganese sulfate, manganese nitrate Manganese dihydrogen phosphate, manganese acetate, manganese salicylate, manganese benzoate, manganese lactate, nickel chloride, nickel bromide, nickel sulfate, nickel nitrate, nickel acetate, tin sulfate, titanium chloride, zinc chloride, zinc bromide, sulfuric acid Zinc, zinc nitrate, zinc thiocyanate, zinc acetate, etc. Salts of polyvalent metals, and the like.
[0063]
On the other hand, examples of the cationic compound include primary, secondary, tertiary and quaternary amines and salts thereof.
Specific examples of the ink coagulant comprising the cationic compound include tetraalkylammonium salts, alkylamine salts, benzalkonium salts, alkylpyridium salts, imidazolium salts, polyamines, and the like, for example, isopropylamine, isobutyl Amine, t-butylamine, 2-ethylhexylamine, nonylamine, dipropylamine, diethylamine, trimethylamine, triethylamine, dimethylpropylamine, ethylenediamine, propylenediamine, hexamethylenediamine, diethylenetriamine, tetraethylenepentamine, diethanolamine, diethylethanolamine, triethanolamine Ethanolamine, tetramethylammonium chloride, tetraethylammonium bromide, dihydroxyethylstearyl Min, 2-heptadecenyl - hydroxyethyl imidazoline, lauryl dimethyl benzyl ammonium chloride, cetyl pyridinium chloride, stearamide methyl pyridinium chloride, diallyldimethylammonium chloride polymers, diallylamine polymers include monoallylamine polymer and the like.
[0064]
Among the ink flocculants listed above, more preferred are aluminum sulfate, calcium chloride, calcium nitrate, calcium acetate, magnesium chloride, magnesium nitrate, magnesium sulfate, magnesium acetate, tin sulfate, zinc chloride, and zinc nitrate. , Zinc sulfate, zinc acetate, aluminum nitrate, monoallylamine polymer, diallylamine polymer, diallyldimethylammonium chloride polymer and the like.
[0065]
On the other hand, for an ink containing a coloring material having a cationic group on the surface, it is preferable to use an anionic compound or the like as an ink coagulant.
Examples of the anion compound include organic carboxylic acids or organic sulfonic acids, and salts thereof. Specifically, examples of the organic carboxylic acid include acetic acid, oxalic acid, lactic acid, fumaric acid, citric acid, salicylic acid, benzoic acid, and the like. Oligomers and polymers having a plurality of these basic structures may be used. Examples of the organic sulfonic acid include compounds such as benzenesulfonic acid and toluenesulfonic acid, and an oligomer or a polymer having a plurality of these basic structures may be used.
[0066]
The ink flocculant contained in the ink flocculant may be only one kind, or two or more kinds. Further, the content of the ink flocculant in the ink flocculant is preferably in the range of 0.1 to 15% by mass, and more preferably in the range of 0.5 to 10% by mass.
[0067]
(Inkjet recording device)
Next, an ink jet recording apparatus (hereinafter sometimes abbreviated as “printer”) using the ink jet recording method of the present invention will be described below.
That is, the ink jet recording apparatus of the present invention includes ink of at least three colors including cyan, magenta, and yellow, and the ink jet recording apparatus that sequentially superimposes the ink for each color on a recording medium surface and prints the ink. , Magenta, cyan, and yellow, or yellow, cyan, and magenta.
[0068]
Therefore, according to the present invention, it is possible to prevent color unevenness due to the printing order of images when printing an image by overlaying ink on the surface of a recording medium. In the case where one or more inks of colors other than cyan are used, a printing unit that performs printing in the form of the above-described printing order can be used, similarly to the above-described inkjet recording method of the present invention. .
More preferably, the printing means has a function of sequentially printing the ink after applying the ink aggregation liquid to the surface of the recording medium. When such a function is not provided, unevenness or bleeding of the printed image may occur, the optical density may decrease, or the drying time of the image immediately after printing may increase.
[0069]
The specific configuration of the printer of the present invention is not particularly limited as long as it has the above-described printing means, but it is a printer that has at least a scanning head having a recording head and performs reciprocal batch printing. Is preferred.
That is, the printing unit uses at least three colors of ink including cyan, magenta, and yellow, and on a single scanning line, at least one of the inks corresponding to the respective colors of ink arranged in series in the scanning line direction. A first recording head corresponding to the cyan ink; a second recording head corresponding to the magenta ink; and a third recording head corresponding to the yellow ink. It is preferable to include a configuration disposed between the recording head and the recording head.
[0070]
By arranging the recording heads on the scanning lines in this manner, even when printing is performed in the forward or reverse direction, the ink of each color is printed in the order of magenta, cyan, and yellow, or in the order of yellow, cyan, and magenta. be able to.
If the recording head is not disposed as described above, it is impossible to prevent the occurrence of color unevenness.
[0071]
It should be noted that a side opposite to the side on which the second recording head is disposed with respect to the first recording head and a side opposite to the side on which the third recording head is disposed relative to the first recording head. May be provided with a recording head corresponding to inks of colors other than cyan (for example, a recording head corresponding to black ink) as necessary.
In addition, between the first recording head and the second recording head or between the first recording head and the third recording head, a recording head corresponding to an arbitrary color (for example, A recording head corresponding to black ink) may be provided as needed.
[0072]
In the case of using an ink aggregation liquid other than ink, the printing means may use one or more inks of at least three colors including cyan, magenta and yellow and ink aggregation liquid arranged on one scanning line. And at least five or more recording heads corresponding to the inks of the respective colors and the ink aggregation liquid arranged in series in the scanning line direction on the scanning line, and at least with respect to the first recording head. On a side opposite to the side on which the second recording head is disposed, a fourth recording head corresponding to the ink aggregation liquid is disposed, and the third recording head is disposed with respect to the first recording head. It is preferable that a fifth recording head corresponding to the ink aggregation liquid is disposed on a side opposite to the opposite side.
[0073]
By arranging the recording heads on the scanning lines in this manner, even when printing is performed in the forward or reverse direction, ink of each color can be sequentially superimposed and printed after applying the ink aggregation liquid to the surface of the recording medium.
When the recording head is not disposed as described above, color unevenness or bleeding of the printed image may occur, the optical density may decrease, or the drying time of the image immediately after printing may increase.
[0074]
In the case where a sixth recording head corresponding to black ink or the like is provided on the side opposite to the side on which the second recording head is disposed with respect to the first recording head, the sixth recording head is provided. It is preferable that a fourth recording head corresponding to the ink aggregation liquid is disposed on a side of the recording head opposite to a side on which the third recording head is disposed.
However, when one or more recording heads are further provided on the side opposite to the side on which the third recording head is disposed with respect to the sixth recording head, the furthest from the third recording head is provided. A fourth recording head corresponding to the ink aggregation liquid is provided on a side opposite to the third recording head with respect to the recording head.
Such a relationship is the same when a fifth recording head is provided on the side opposite to the side on which the third recording head is disposed with respect to the first recording head.
Further, it is necessary that at least two recording heads corresponding to the ink aggregation liquid are arranged on the scanning line, but they may be arranged between the recording heads corresponding to the respective color inks as needed.
[0075]
In the present invention, the “recording head” is, as described above, arranged on one scanning line in series with respect to the scanning line direction, and is movable in both of the scanning line directions. And a nozzle surface provided with one or more nozzles for discharging a liquid such as ink or an ink aggregation liquid (hereinafter, abbreviated as “printing liquid”). The nozzle surface is disposed close to the surface of the recording medium so that ink can be applied to the surface of the recording medium during printing. Further, the recording head is connected to a printing liquid storage section for supplying a printing liquid.
[0076]
The recording head is not particularly limited as long as it satisfies at least the above-described conditions, but may be an integrated type in which at least two or more recording heads are adjacently connected to each other in the scanning line direction. .
[0077]
Further, the printer of the present invention is not particularly limited as long as it has at least cyan, magenta and yellow inks as the ink, but it is preferable that the printer further includes black ink.
[0078]
The ink jet recording apparatus of the present invention may have known members and functions in addition to the above as needed. For example, an ink jet recording apparatus equipped with a heater or the like for controlling ink drying may be used. Further, an inkjet recording apparatus equipped with an intermediate transfer mechanism and having a function of printing ink on the intermediate and then transferring the ink to a recording medium such as paper may be used.
[0079]
<Specific example of inkjet recording apparatus>
Next, the above-described inkjet recording apparatus of the present invention will be specifically described with reference to the drawings (FIGS. 1 to 3). However, the inkjet recording apparatus of the present invention is not limited to only the configuration of the drawings described below. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and duplicate description may be omitted.
[0080]
-Configuration of inkjet recording device-
FIG. 1 is a perspective view schematically showing an example of an external configuration of the inkjet recording apparatus of the present invention, and FIG. 2 is a perspective view schematically showing an example of a basic configuration inside the inkjet recording apparatus shown in FIG. FIG. Note that the XYZ axes and the arrow XYZ directions shown in FIG. 1 correspond to those shown in FIG.
[0081]
In FIG. 1, reference numeral 100 denotes an ink jet recording apparatus (printer), 5 denotes a scanning head, 6 denotes an external cover, 7 denotes a paper feed tray, 11 denotes a scanning line (guide lot), and 16 denotes a paper discharge tray. Note that, in FIG. 1, a portion indicated by a dotted line indicates that the portion is provided inside the outer cover 6. For convenience of explanation, only main internal components indicated by reference numerals 5 and 11 are simplified by dotted lines.
2, 1 is a recording medium, 2 'is a transport roller, 3 is a recording head, 4 is a printing liquid storage unit, 5 is a scanning head, 8 is an image forming unit, 9 is a power supply signal cable, 10 is a carriage, 11 is a scanning line (guide lot), 12 is a timing belt, 13 and 13 'are drive pulleys, 14 is a maintenance station, and 15 is a tube.
[0082]
In FIG. 1, a printer 100 includes an external cover 6, a paper feed tray 7, a paper discharge tray 16, and the like, in which a scanning head 5, a guide lot 11, and the like are provided.
The outer cover 6 constitutes a main surface (six surfaces) perpendicular to the XYZ axes of the printer 100, and perpendicular to the X axis in the direction of the arrow X (hereinafter, abbreviated as “front” in the description of FIG. 1). The direction opposite to this is abbreviated as “rear”) and a surface perpendicular to the Y-axis and on the side of the arrow Y (hereinafter abbreviated as “upper surface”) is about 3/5 of the center of the side formed by The upper surface and a part of the front surface of the hand are open from the side of the length as a base point. In this opening, a paper discharge tray 16 parallel to the upper surface is provided.
[0083]
On the other hand, a paper feed tray 7 is provided on the rear surface of the outer cover 6 so as to cross the surface obliquely (about 45 degrees with respect to the direction of the arrow Y) and to partially reach the inside of the printer 100. Have been. In printing, the recording medium 1 is supplied from the paper feed tray 7 to print an image on the surface of the recording medium 1 inside the printer 100, and the recording medium 1 on which the image is printed is discharged to the discharge tray 16. You.
[0084]
-Configuration inside the inkjet recording device-
Next, a specific configuration inside the printer 100 will be described with reference to FIG.
The inside of the printer 100 is roughly divided into a pair of transport rollers 2 and 2 ′ for transporting the recording medium 1 supplied from the paper feed tray 7 shown in FIG. 1 in the arrow X direction, and the arrow X direction of the transport rollers 2 and 2 ′. Image formation provided on the side of the recording medium 1 conveyed in the direction of the arrow X and on the side of the direction of the arrow Y (hereinafter referred to as “upper side” and the opposite side to “lower side”) Unit 8
The transport roller 2 and the transport roller 2 ′ are in contact with each other at their outer peripheral surfaces, the roller shafts are both arranged parallel to the Y axis, the transport roller 2 is disposed on the upper side, and the transport roller 2 ′ is located on the lower side. Is arranged. The recording medium 1 can be inserted through the contact portion in the direction of the arrow X, and is conveyed in the direction of the arrow X in parallel with the plane formed by the XY axes by rotation of the conveying rollers 2 and 2 '.
[0085]
The image forming unit 8 includes a recording head 3, a printing liquid storage unit 4, a scanning head 5, a power supply signal cable 9, a carriage 10, a guide lot 11, a timing belt 12, a pair of drive pulleys 13, 13 ', and a maintenance station. 14 and a tube 15.
The drive pulleys 13 and 13 ′ are arranged on both sides in the Y-axis direction of the recording medium 1 so that the rotation axes thereof are parallel to the Z axis and sandwich the recording medium 1. A drive pulley 13 is provided on the side opposite to the arrow Y direction, and is further fixed to an external cover (not shown) located below the recording medium 1.
A timing belt 12 is stretched over the drive pulleys 13 and 13 ′ above the recording medium 1, and is rotatable in both directions by a drive source (not shown) connected to the drive pulley 13.
[0086]
The guide lot 11 is provided parallel to and close to a plane defined by the X axis and the Y axis with respect to the timing belt 12, and is provided on the opposite side of the timing belt 12 from the transport roller 2. Both ends of the guide lot 11 are fixed to an external cover (not shown).
The carriage 10 is fixed so as to be movable in conjunction with the timing belt 12 stretched in the direction of the arrow X, and has a guide hole through which the guide lot 11 penetrates. Thus, the carriage 10 rotates the timing belt 12 on the arrow X direction side in the arrow Y direction (hereinafter, may be abbreviated as “forward direction”) and the opposite direction (hereinafter, may be abbreviated as “reverse direction”). With this, it is possible to move forward and backward.
[0087]
The carriage 10 is mounted with a scanning head 5 including a recording head 3 and a printing liquid storage unit 4. The recording head 3 has a nozzle surface (not shown) provided with a plurality of nozzles, and is mounted on the carriage 10 such that the nozzle surface faces and approaches the surface of the recording medium 1. A printing liquid storage unit 4 is provided above the recording head 3, and the recording liquid storage unit 4 is provided on the surface of the recording head 3 opposite to the arrow X direction in accordance with image information. The supplied printing liquid is supplied to the recording head 3 and a power supply signal cable 9 for controlling the ejection of ink from the nozzles is connected.
[0088]
A maintenance station 14 is provided near the end of the guide lot 11 on the arrow Y side, and the maintenance station 14 is connected to a pressure reducing device (not shown) via a tube 15.
Further, the maintenance station 14 is connected to the nozzle portion of the recording head 3 and has a function of sucking ink from the nozzles of the recording head 3 by reducing the pressure inside the nozzles of the recording head 3. . By providing the maintenance station 14, extra ink adhering to the nozzles can be removed as needed while the ink jet recording apparatus 100 is operating, or evaporation of ink from the nozzles can be stopped when the operation is stopped. Can be suppressed.
[0089]
-Detailed configuration of scanning head-
Next, a specific configuration of the scanning head 5 shown in FIG. 2 will be described. 3A and 3B are schematic views showing the configuration of a scanning head used in the ink jet recording apparatus shown in FIG. 2, wherein FIG. 3A is a perspective view of the scanning head 5, and FIG. FIG. 4 is a plan view showing a nozzle surface of FIG. The XYZ axes and arrow XYZ directions shown in FIG. 3 correspond to those shown in FIGS.
2, reference numerals 3, 31 to 36 denote recording heads, 31 'to 36' denote nozzle surfaces, 4, 41 to 46 denote printing liquid storage units, and 60 denotes nozzles.
[0090]
As shown in FIG. 3A, the scanning head 5 includes a recording head 3 and a printing liquid storage unit 4 provided on an upper surface of the recording head 3. The recording head 3 is composed of recording heads 31, 32, 33, 34, 35, and 36 provided adjacently in this order from the reverse direction to the forward direction. The printing liquid storage sections 41, 42, 43, 44, 45, 46 are provided adjacent to each other in this order. In addition, the recording head and the printing liquid storage unit in which the lower one digit number of the reference numeral 30 and the lower one digit number of the reference numeral 40 correspond to each other form a pair. The printing liquid stored in the printing liquid storage unit 41 is discharged from a nozzle provided on the nozzle surface of the recording head 31.
[0091]
Further, nozzle surfaces are provided on the lower surfaces of the recording heads 31 to 36. FIG. 2B is a plan view showing the nozzle surface, and nozzle surfaces 31 ′ to 36 ′ are sequentially provided in the Y-axis direction for each of the recording heads 31 to 36. A plurality of nozzles 60 are arranged on each nozzle surface in the X-axis direction.
At the time of printing, when the scanning head 5 moves in the forward direction, a predetermined amount of the printing liquid corresponding to the image information is supplied to the nozzles 60 ′ in order from the nozzle surface 36 ′ to the nozzle surface 31 ′ for each nozzle surface. When the scanning head 5 moves in the reverse direction, a predetermined amount of printing liquid corresponding to the image information is supplied to the nozzles 60 in the order from the nozzle surface 31 'to the nozzle surface 36' for each nozzle surface. Is discharged from.
[0092]
In the present invention, for example, black ink is stored in the printing liquid storage section 42, magenta ink is stored in the printing liquid storage section 43, and cyan ink is stored in the printing liquid storage section 44. The yellow ink is stored in the printing liquid storage unit 45. In this case, the printing liquid storage units 41 and 46 do not need to store any liquid, but may store an ink aggregation liquid. Thus, the printing liquid stored in each printing liquid storage unit is supplied to each recording head. The type and combination of the printing liquid and the storage in each printing liquid storage section are not particularly limited as long as they follow the inkjet recording method of the present invention.
[0093]
-Image printing-
Next, printing of an image by the printer 100 having the configuration shown in FIGS. 1 to 3 will be described.
However, the printing liquid storage units 41 and 46 store the ink aggregation liquid, the printing liquid storage unit 42 stores the black ink, the printing liquid storage unit 43 stores the magenta ink, and The following description is based on the premise that cyan ink is stored in the liquid storage unit 44 and yellow ink is stored in the printing liquid storage unit 45.
[0094]
The recording medium 1 is supplied from the paper feed tray 7 and is conveyed in the arrow X direction below the scanning head 5 by the conveyance rollers 2 and 2 ′. At this time, the scanning head 5 moves in the forward and reverse directions by rotating the driving pulley 13 according to the image information. At this time, an image is printed on the upper surface of the recording medium 1 by discharging a printing liquid from the nozzles 60 provided on the nozzle surfaces 31 ′ to 36 ′ according to the image information.
[0095]
At the time of printing, when the scanning head 5 moves in the forward direction, a predetermined amount of the printing liquid corresponding to the image information is supplied to the nozzles 60 ′ in order from the nozzle surface 36 ′ to the nozzle surface 31 ′ for each nozzle surface. When the scanning head 5 moves in the reverse direction, a predetermined amount of printing liquid corresponding to the image information is supplied to the nozzles 60 in the order from the nozzle surface 31 'to the nozzle surface 36' for each nozzle surface. Is discharged from.
When the scanning type head 5 moves in the forward direction by discharging the printing liquid from the nozzle in this manner, after the ink aggregation liquid is applied to the surface of the recording medium 1, the amount corresponding to the image information is increased. Are sequentially printed in the order of yellow, cyan, magenta, and black, and when the scanning head 5 moves in the opposite direction, the image information is applied after the ink aggregation liquid is applied to the surface of the recording medium 1. Are printed sequentially in the order of black, magenta, cyan, and yellow.
As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments.
[0096]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.
-Ink-
Each color ink was prepared according to the following ink preparation method. When a pigment that cannot be dispersed in water as a coloring material is used, a pigment treated by a pigment treatment method described below was used.
In the following description, the symbol “Bk” may be used as an abbreviation for black, the symbol “C” for cyan, the symbol “M” for magenta, and the symbol “Y” for yellow.
[0097]
(Pigment treatment method)
After subjecting the pigment to a surface oxidation treatment with sodium hypochlorite, a desalting treatment was performed. The surface-treated pigment thus obtained was added to ion-exchanged water so that the pigment concentration became 20% by mass, the pH was adjusted to 7.5, and then dispersed using an ultrasonic homogenizer. Further, this dispersion is subjected to a centrifugal separation treatment (8000 rpm × 30 minutes) by a centrifugal separator to remove a residual portion (20% by mass based on the total amount), whereby a color material solution in which the surface-treated pigment is dispersed is obtained. Obtained.
[0098]
(How to make ink)
A water-soluble organic solvent, a surfactant, ion-exchanged water and the like were added to the colorant solution, and the ink was adjusted so that each material was contained in a predetermined amount. This was mixed, stirred and filtered through a 1 μm filter to obtain an ink having a desired composition.
[0099]
<Bk-1>
Using the following composition, an ink was prepared according to the above-described ink preparation method, and a black ink (Bk-1) was obtained.
-Cabojet-300 (manufactured by Cabot): 4.5% by mass
-Styrene-methacrylic acid copolymer: 0.15 mass%
・ Ethylene glycol: 20% by mass
・ Diglycerin ethylene oxide adduct: 5% by mass
・ Urea: 3.5% by mass
・ Isopropyl alcohol: 3.0% by mass
-Surfactant (SFN465, manufactured by Nisshin Chemical Co., Ltd.): 0.5% by mass
-Water: 63.35 mass%
The viscosity of this ink was 2.5 mPa · s, and the surface tension was 32 mN / m.
[0100]
<C-1>
Using the following composition, the pigment was treated according to the above-described pigment treatment method, and a cyan ink (C-1) was produced according to the above-described ink production method.
・ C. I. Pigment Blue 15: 3 (surface-treated pigment): 4.5% by mass
-Styrene-methacrylic acid copolymer: 0.2% by mass
-Thiodiethanol: 15% by mass
-2-pyrrolidone: 10% by mass
-Thiourea: 4.5% by mass
・ Polyoxyethylene 2-ethylhexyl ether: 0.5% by mass
・ Isopropyl alcohol: 4.0% by mass
・ Water: 61.3% by mass
The viscosity of this ink was 2.3 mPa · s, and the surface tension was 35 mN / m.
[0101]
<M-1>
Using the following composition, the pigment was treated according to the pigment treatment method described above, and a magenta ink (M-1) was produced according to the ink production method described above.
・ C. I. Pigment Red 122 (surface-treated pigment): 4.5% by mass
・ Styrene-acrylic acid copolymer: 0.10% by mass
・ Diethylene glycol: 25% by mass
・ Urea: 4.5% by mass
-Surfactant (SFN465, manufactured by Nisshin Chemical Co., Ltd.): 0.5% by mass
・ Isopropyl alcohol: 4.0% by mass
・ Water: 41.4% by mass
The viscosity of this ink was 2.6 mPa · s, and the surface tension was 33 mN / m.
[0102]
<Y-1>
Using the following composition, the pigment was treated according to the above-described pigment treatment method, and a yellow ink (Y-1) was produced according to the above-described ink production method.
・ C. I. Pigment Yellow 138 (surface-treated pigment): 4.5% by mass
-Butyl methacrylate-methacrylic acid copolymer: 0.15% by mass
-Glycerin: 20% by mass
・ 1,5-pentaneddiol: 5% by mass
・ Urea: 3.5% by mass
・ Polyoxyethylene 2-ethylhexyl ether: 0.5% by mass
・ Isopropyl alcohol: 4.0% by mass
・ Water: 62.35% by mass
The viscosity of this ink was 2.7 mPa · s, and the surface tension was 33 mN / m.
[0103]
<Y-2>
Using the following composition, a yellow ink (Y-2) was prepared according to the above-described ink preparation method.
・ IJX444 (manufactured by Cabot): 4.5% by mass
・ Styrene-methacrylic acid copolymer: 0.1% by mass
・ Diethylene glycol: 15% by mass
・ Propylene glycol: 10% by mass
・ Urea: 3% by mass
-Polyoxyethylene 2-ethylhexyl ether: 0.7% by mass
・ Isopropyl alcohol: 4.0% by mass
・ Water: 62.7% by mass
The viscosity of this ink was 2.4 mPa · s, and the surface tension was 32 mN / m.
[0104]
−Ink aggregation liquid−
<TL-1>
The following composition was mixed and stirred to obtain an ink aggregation liquid (TL-1).
-Glycerin: 10% by mass
・ Thiodiethanol: 10% by mass
-Magnesium acetate: 10% by mass
・ Urea: 2.5% by mass
-Polyoxyethylene 2-ethylhexyl ether: 0.6% by mass
・ Water: 66.9% by mass
[0105]
(Print test)
The print test was performed using a prototype printer (manufactured by Fuji Xerox Co., Ltd.) having the same configuration as the printer shown in FIGS. 1 and 2 at 800 dpi equipped with four color inks of cyan, yellow, magenta, and black. went.
As the scanning head, a prototype head of 256 nozzles having substantially the same configuration as the scanning head 5 shown in FIG. 3 was used, and as a recording medium, FX-P paper (manufactured by Fuji Xerox Co., Ltd.) was used. As the printing liquid stored in the printing liquid storage section of the prototype head, an ink aggregation liquid was used as required in addition to the four color inks of cyan, yellow, magenta, and black.
The printing test was performed under a general environment (temperature: 23 ± 0.5 ° C., humidity: 55 ± 5% RH). The evaluation of the obtained printed image (color unevenness, optical density, bleeding, intercolor bleeding) The test was carried out after standing for 24 hours in a general environment. Further, the drying speed of the image formed on the plain paper surface immediately after printing was evaluated.
[0106]
Note that the printing test was evaluated by changing the combination of the order of applying the ink and the ink aggregation liquid. Table 1 shows the arrangement in the scanning direction of each scanning type head storing the ink of each color and the ink aggregation liquid in the printing test in each of the examples and the comparative examples. Table 2 shows the evaluation results of the examples and the comparative examples.
[0107]
[Table 1]

[0108]
[Table 2]

[0109]
(Evaluation method)
The details of the evaluation procedure and evaluation criteria shown in Table 2 will be described below.
<Color unevenness>
A sample was prepared by superimposing and printing a so-called process black pattern composed of cyan, magenta, and yellow so that the printing order of the inks was different.
This was converted to a hue (lightness L) using X-Rite 938 (manufactured by X-Rite). ^* , Saturation a ^* / B ^* ) Was measured. Note that ΔE derived from the following equation (1) was used as a criterion for determining color unevenness.
[0110]
(Equation 1)

[0111]
[However, in equation (1), ΔL ^* , Δa ^* , Δb ^* Are L of the hue measurement results when the prototype head is scanned in the forward direction and when the prototype head is scanned in the reverse direction. ^* , A ^* , B ^* Shows the difference between ]
[0112]
The color unevenness was evaluated according to the following evaluation criteria.
-Evaluation criteria-
…: ΔE is less than 5
Δ: ΔE is 5 or more and less than 10
×: ΔE is 10 or more
[0113]
<Optical density>
A 100% coverage pattern was printed for each color ink, and the optical density was measured using X-Rite 404 (manufactured by X-Rite). The optical density was evaluated according to the following criteria.
[0114]
-Evaluation criteria-
…: The optical density of the black coverage pattern is 1.4 or more, and the optical density of each color (cyan, magenta, and yellow) coverage pattern is 1.1 or more.
Δ: The optical density of the black coverage pattern is 1.3 or more and less than 1.4, and the optical density of each color color coverage pattern is 1.0 or more and less than 1.1.
×: The optical density of the black coverage pattern is less than 1.3, and / or the optical density of each color coverage pattern is less than 1.0.
[0115]
<Intercolor bleed>
The evaluation of intercolor bleed is performed by using black, color, and a color obtained by superimposing the four inks, printing patterns that are adjacent to each other so that different colors do not overlap, and determining the degree of bleed at the boundary in advance. The sensory evaluation was performed by collating with the set limit sample. In addition, the bleeding between colors was evaluated based on the following criteria.
-Evaluation criteria-
…: Little bleeding between colors
Δ: Inter-color bleeding occurred but at an acceptable level.
×: Vignetting between colors was severe and out of the allowable range.
[0116]
<Bleeding>
A fine line pattern consisting of black, color, or a color obtained by superimposing four inks was printed, and the degree of bleeding of the printed portion was checked against a limit sample, and the sensory evaluation was performed. The bleeding was evaluated according to the following criteria.
-Evaluation criteria-
…: Less bleeding.
Δ: Bleeding occurred but at an acceptable level.
X: Vigorous bleeding and out of the allowable range.
[0117]
<Drying time>
After a lapse of a predetermined time after printing the 100% coverage pattern on the FX-P paper, another FX-P paper is 1.9 × 10 on the surface on which the print pattern is formed. ⁴ N / m ² Press with the load. At this time, the time during which the ink was not transferred to the pressed FX-P paper side was defined as the drying time. The drying time was evaluated according to the following criteria.
-Evaluation criteria-
…: Drying time is less than 3 seconds.
Δ: Drying time is 3 seconds or more and less than 10 seconds.
X: Drying time is 10 seconds or more.
[0118]
【The invention's effect】
As described above, according to the present invention, it is an object to provide an ink jet recording apparatus and an ink jet recording method capable of preventing the occurrence of color unevenness due to the printing order of ink.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an example of an external configuration of an ink jet recording apparatus according to the present invention.
FIG. 2 is a perspective view schematically showing an example of a basic configuration inside the ink jet recording apparatus shown in FIG.
FIG. 3 is a schematic diagram showing a configuration of a scanning head used in the ink jet recording apparatus shown in FIG.
[Explanation of symbols]
1 Recording medium
2 Transport roller
2 'transport roller
3 Recording head
4 Liquid storage for printing
5 Scanning head
6 External cover
7 Paper tray
8 Image forming unit
9 Power supply signal cable
10 Carriage
11 scanning lines (guide lot)
12 Timing belt
13 Drive pulley
13 'drive pulley
14 Maintenance station
15 tubes
16 Output tray
31, 32, 33, 34, 35, 36 Recording head
31 ', 32', 33 ', 34', 35 ', 36' Nozzle surface
41, 42, 43, 44, 45, 46 Printing liquid storage unit
60 nozzles
100 Inkjet recording device (printer)

Claims (8)

An ink jet recording apparatus comprising at least three colors of inks including cyan, magenta and yellow, and printing the inks sequentially over the recording medium surface for each color.
An ink jet recording apparatus comprising at least printing means for printing the ink in the order of magenta, cyan, and yellow, or in the order of yellow, cyan, and magenta. 2. The ink jet recording apparatus according to claim 1, wherein the printing unit prints the ink sequentially after applying the ink aggregation liquid to the surface of the recording medium. The printing means uses at least three colors of ink including cyan, magenta and yellow, and at least three inks corresponding to the inks of the respective colors arranged in series on a single scanning line in the scanning line direction. A first recording head corresponding to the cyan ink, a second recording head corresponding to the magenta ink, and a third recording head corresponding to the yellow ink 2. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is disposed between the ink jet recording apparatus and the printer. The printing means is arranged on one scanning line, using ink of at least three colors including cyan, magenta and yellow and an ink aggregation liquid, on one scanning line, in the scanning line direction At least five or more recording heads corresponding to the inks of the respective colors and the ink aggregation liquid arranged in series are provided, and at least a side on which the second recording head is disposed with respect to the first recording head. On the opposite side, a fourth recording head corresponding to the ink aggregation liquid is disposed, and on the side opposite to the side on which the third recording head is disposed relative to the first recording head, the fourth recording head is disposed on the ink aggregation liquid. The inkjet recording apparatus according to claim 3, wherein a corresponding fifth recording head is disposed. 2. The ink jet recording apparatus according to claim 1, further comprising inks of four colors of cyan, magenta, yellow, and black. An ink-jet recording method for printing inks of at least three colors including cyan, magenta and yellow sequentially on a recording medium surface for each color sequentially,
An ink jet recording method, wherein the ink is printed in the order of magenta, cyan, and yellow, or in the order of yellow, cyan, and magenta. The ink jet recording method according to claim 6, wherein the ink is sequentially superimposed and printed after applying the ink aggregation liquid to the surface of the recording medium. 7. The ink jet recording method according to claim 6, wherein the ink is printed by being superimposed on a recording medium surface by a thermal ink jet method.

Images