Oil-based inkjet printing method and ink set

A printing method and technology of oil-based ink, applied in the directions of printing, ink, copying/marking method, etc., can solve the problems of printing dot bleeding, increase of printing through, and no inhibition of ink smear, etc., to prevent printing and bleeding. , the effect of increasing the printing density

Active Publication Date: 2014-04-30
RISO KAGAKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since water-based ink contains water as a solvent, when ordinary paper is used as the printing medium, the solvent is easy to penetrate into the printing medium, and the pigment is easy to stay on the surface of the printing medium, so it is easy to obtain a high-density and high-quality printed image. On the one hand, it has the following disadvantages: the printing medium is prone to curling and wrinkling, which adversely affects the conveyance of the printing medium, and becomes a disadvantage of high-speed printing
[0007] However, the oil-based ink has the following disadvantages: the separation of the colorant and the solvent on the printing medium is poor, especially when plain paper is used as the printing medium, the colorant and the solvent are easy to penetrate into the fiber gap of the printing medium together, and the image density is reduced. Printing increases, printing dots bleed, and the image quality of printed images deteriorates
However, although this ink receiving layer has the effect of increasing the diameter of the printing dot to obtain a high printing density, it does not have the effect of suppressing ink stains on the roller inside the printing device or on the printing paper for continuous printing.

Method used

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  • Oil-based inkjet printing method and ink set
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  • Oil-based inkjet printing method and ink set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I-1～I-4、 comparative example I-1～I-4

[0128] (1) Preparation of pretreatment liquid containing inorganic particles

[0129] The components shown in Table 1 were premixed in the ratio shown in Table 1, and then dispersed with a bead mill (using zirconia beads with a diameter (φ) of 2.0 mm), and the resulting dispersion was passed through a nylon mesh (opening diameter: 200 μm) ) to obtain the pretreatment solution.

[0130] (2) Preparation of oily ink

[0131] The components shown in Table 1 were pre-mixed in the ratio shown in Table 1, and thereafter, zirconia beads with a diameter (φ) of 0.5 mm were put into the rocking mill (ROCKING MILL) (manufactured by Seiwa Giken Co., Ltd.) Dispersion was carried out for 60 minutes, and the resulting dispersion liquid was filtered through a membrane filter (opening diameter: 3 μm) to prepare a black ink.

[0132] Table 1

[0133]

[0134] In addition, for the oil-based ink solvent as a mixed solvent of three organic solvents, its SP value (δ mix ) is calculated ...

Embodiment I-5～I-7、 comparative example I-5～I-8

[0172] Except having replaced the formula of Table 1 with the formula of Table 2, it experimented similarly to Example I-1. The results are shown in Table 2.

[0173] Table 2

[0174]

[0175] However, the details of the raw materials described in Table 2 are the same as those in Table 1.

[0176] From the results in Table 2, the following facts can be seen.

[0177] In Examples I-5 to I-7 using the pretreatment liquid of the present invention, sufficient printing density was obtained while preventing offset. In contrast, the difference between the solubility parameter (SP value) of the solvent of the pretreatment liquid and the solubility parameter (SP value) of the oily ink is less than 2.0 (cal / cm 3 ) 1 / 2 In Comparative Examples I-5 to I-8, the printing density was low, and in Comparative Examples I-7 and I-8, offset and bleeding occurred.

Embodiment I-8～I-17、 comparative example I-9

[0179] (1) Preparation of pretreatment liquid containing inorganic particles

[0180] The components shown in Table 3 were premixed at the ratios shown in Table 3, and then dispersed for 1 minute with an ultrasonic disperser, and the resulting dispersion was used as a pretreatment liquid.

[0181] (2) Preparation of oily ink

[0182] The components shown in Table 3 were pre-mixed at the ratio shown in Table 3, and thereafter, zirconia beads with a diameter (φ) of 0.5 mm were put into the rocking mill (ROCKING MILL) (manufactured by Seiwa Giken Co., Ltd.) Dispersion was carried out for 60 minutes, and the resulting dispersion liquid was filtered through a membrane filter (opening diameter: 3 μm) to prepare a black ink.

[0183] table 3

[0184]

[0185] In addition, for the oil-based ink solvent as a mixed solvent of three organic solvents, its SP value (δ mix ) is calculated according to the above formula (2).

[0186] However, the details of the raw materials des...

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Abstract

Pre-treatment solutions are provided, which can improve printing density and prevent bleeding and strike through when printing, particularly inkjet printing is performed with an oil ink on a printing medium that has been treated with the pre-treatment solutions. The pre-treatment-solution can be selected from the following (I), (II) and (III): (I): a pre-treatment solution which comprises at least inorganic particles with an average particle diameter of not less than 1 μm and not more than 20 μm and a solvent, in which the difference in solubility parameter (SP value) between the solvent of the pre-treatment solution and the solvent of the oil ink is not less than 1.0 (cal / cm3)1 / 2; (II): a pre-treatment solution which comprises at least inorganic particles with an average particle diameter of not less than 0.1 μm and less than 1 μm and a solvent, in which the difference in solubility parameter (SP value) between the solvent of the pre-treatment solution and the solvent of the oil ink is not less than 2.0 (cal / cm3)1 / 2; and (III): a pre-treatment solution which comprises at least inorganic particles, a polyvinyl alcohol with a degree of polymerization of not more than 500 and a degree of saponification of not less than 60 mol %, and water.

Description

technical field [0001] The present invention relates to an oil-based inkjet printing method, an ink set and a pretreatment liquid used in the printing method, which can prevent strike-through and bleeding by suppressing ink penetration into a printing medium, thereby enabling improved printing The concentration, preferably, can also improve the dryness of the ink. Background technique [0002] In the inkjet printing system, in recent years, there has been an increasing demand for full-color printing at high speed regardless of the recording medium. In order to meet this requirement, an inkjet printer with a line head type is suitable. In this case, it is necessary to have fast penetration on plain paper, fast drying, and high printing density, bleeding, and print-through. Less ink for high-quality printed images. [0003] Inkjet inks used in inkjet printing are roughly classified into aqueous inks and non-aqueous inks. [0004] Since water-based ink contains water as a so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M5/00B41J2/01
CPCC09D11/36C09D11/54B41M5/0011
Inventor 荒井彩弥子中田安美
Owner RISO KAGAKU CORP
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