JPH07112573A - Ink jet recording method - Google Patents

Abstract

PURPOSE:To provide an ink jet recording method causing no clogging in a jet nozzle part, especially suitable for color recording and not deteriorating the water resistance of recording paper by preparing the recording paper containing a base material and the color forming layer formed on the surfaces of the base material to inject a solvent to the recording paper and reacting the solvent with the color forming layer to develop a color. CONSTITUTION:The recording paper containing a base material and the color forming layer formed on the surfaces of the base material is prepared and a solvent 14 is injected from the jet nozzle part 16 of an ink jet printer 10 as liquid particles 18 to be reacted with the color forming layer to develop a color. In this method, it is unnecessary to inject water-based ink containing many components such as pigment, a binder, a solvent or the like to the recording paper and no clogging is happened in the jet nozzle part. Further, it is unnecessary to add a coloring agent to the solvent at the time of color recording and the clogging of the jet nozzle part with the coloring agent is not caused and this method is suitable for color recording and, further, it is unnecessary to inject the water-based ink to the recording paper and the water resistance of the recording paper is not deteriorated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording on recording paper, and more particularly to recording paper such as postal labels for bar codes, train tickets, electrocardiograms, drawings for drafting, receipt recording papers for automatic teller machines, etc. Of the inkjet recording method.

[0002]

2. Description of the Related Art Conventionally, as a method for recording on a recording paper, there have been a heat-sensitive recording method, an ink jet recording method, an electrophotographic recording method, etc., which usually uses a reaction between a colorless or monochromatic leuco dye and an acidic substance.

[0003]

However, in the heat-sensitive recording method using the leuco dye, the color reaction is reversible and the storability of the print is poor. Further, in the conventional ink jet recording method, the dry fixability due to the use of the water-based ink was poor. In an attempt to improve this, since the water-based ink composition contains many components such as pigments, binders and solvents, the jet nozzle may be clogged with the water-based ink. In particular, when recording in color, the conventional ink jet recording method is not suitable for recording in color because the color material contained in the water-based ink is clogged in the jet nozzle portion. Furthermore, by using water-based ink,
The water resistance of recording paper deteriorates, and bleeding occurs except for special paper. Further, in the electrophotographic recording method, a recording device becomes large in size.

Therefore, a main object of the present invention is to provide an ink jet recording method which does not cause clogging in a jet nozzle portion, is particularly suitable for color recording, and does not deteriorate the water resistance of recording paper.

[0005]

The present invention provides a step of preparing a recording paper including a base material and a color forming layer formed on the surface of the base material, spraying a solvent, and reacting the solvent with the color forming layer. Let me
And a step of developing a color of the color forming layer.

[0006]

Since the solvent is jetted to react the solvent with the color forming layer, it is not necessary to jet a water-based ink containing multiple components such as a pigment, a binder and a solvent onto a recording paper. Also, when recording in color, it is not necessary to include a coloring material in the solvent.

[0007]

In the ink jet recording method according to the present invention, it is not necessary to jet a water-based ink containing multiple components such as a pigment, a binder and a solvent onto a recording paper. Therefore, according to the present invention, the jet nozzle portion is not clogged, and the degree of freedom in designing the inkjet printer is increased. Further, even when recording in color, it is not necessary to include the coloring material in the solvent, so that there is no possibility that the coloring material will be clogged in the jet nozzle portion, and it is suitable for recording on recording paper in color. Further, since it is not necessary to jet the water-based ink onto the recording paper, it is possible to perform recording on the recording paper without deteriorating the water resistance of the recording paper.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0009]

1 is an illustrative view showing one embodiment of the present invention. The inkjet printer 10 includes a liquid tank 12.
A solvent 14 made of an organic solvent and containing no pigment or binder is stored in the liquid tank 12. A jet nozzle portion 16 is formed at the tip of the bottom portion of the liquid tank 12, and the solvent 14 passes from the jet nozzle portion 16 to the liquid particles 1
8 is injected. An AC power supply 20 is formed near the inkjet printer 10. One end of the AC power supply 20 is grounded, and the other end of the AC power supply 20 is connected to the capacitor 22.
Grounded through. The condenser 22 is formed near the outlet of the jet nozzle portion 18. A label continuum 24 is formed in a portion where the solvent 14 is jetted from the jet nozzle portion 16 through the electric field E of the condenser 22 as liquid particles 18.

As shown in FIG. 2, the continuous label body 24 includes a release liner 26 as a strip-shaped release sheet material. Labels 28 as recording papers are temporarily attached to the surface of the release liner 26 with a gap in the longitudinal direction thereof via a pressure-sensitive adhesive layer 30. Label 28 includes a rectangular substrate 32. A coloring layer 34 is formed on the surface of the base material 32.

The coloring layer 34 is formed by applying the spherical microcapsules 36 shown in FIG. 3 to the surface of the base material 32 together with a binder. The microcapsules 36 are
It is formed by covering the periphery of the coloring material 38 with the shell material 40. The microcapsules 36 are spherical and have a size of several hundreds μm or less. A water-in-oil emulsion is prepared, and a polymer is formed by interfacial polycondensation at the interface between the fine emulsion particles and the medium liquid to cover the particles. Then, the capsules are separated from the oil by centrifugation and purified by dialysis to form the microcapsules 36. When the water-in-oil type emulsion is prepared, the coloring material 38 is dissolved and dispersed in the water phase to form the shell material 4
Cover with 0. The shell material 40 is a thin film such as a polymer, and its thickness is 10 to 20 μm. The shell material 40 is not easily broken by pressure, but is easily dissolved by an organic solvent.
The coloring materials 38 are colorless or monochrome and develop color when they are in contact with each other. Since the shell material 40 is colorless and opaque,
The microcapsules 36 before the shell material 40 is dissolved are colorless and opaque.

When recording on the label 28, the solvent 14 in the liquid tank 12 of the ink jet printer 10 is ejected from the jet nozzle portion 16 as liquid particles 18. The liquid particles 18 are controlled by the electric field E of the condenser 22 and are ejected toward the coloring layer 34 of the label 28. Then, the shell material 40 of the microcapsule 36 is dissolved by the solvent 14, and the coloring materials 38 come into contact with each other to react and develop color. In this way, the display, data and the like are printed on the label 28 as a recording paper, and a visible image is obtained. In addition, the coloring material 38 that colors cyan, magenta, and yellow by contact reaction is coated with different shell materials 40 to form microcapsules, and the solvent 14 that dissolves only each shell material 40 is used.
Full color can be realized by selecting.

According to this embodiment, recording on the label 28 can be performed by jetting the solvent 14 made of an organic solvent toward the color forming layer 34 of the label 28, and multi-components such as pigments, binders and solvents can be recorded. It is not necessary to jet the water-based ink containing the ink onto the recording paper. Therefore, according to this embodiment, the jet nozzle portion 16 of the inkjet printer 10 is not clogged, the degree of freedom in designing the inkjet printer 10 is increased, and the water resistance of the label 28 is not deteriorated. Further, even in the case of recording in color, since it is not necessary to include the coloring material in the solvent 14, there is no fear that the coloring material will be clogged in the jet nozzle portion 16, and it is suitable for recording on the label 28 in color. There is.

[Brief description of drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a label continuum.

FIG. 3 is a cross-sectional view showing a microcapsule.

[Explanation of symbols]

 10 Inkjet Printer 14 Solvent 28 Label 32 Base Material 34 Coloring Layer 36 Microcapsule 38 Coloring Material 40 Shell Material

Claims (1)

[Claims] 1. A step of preparing a recording paper comprising a base material and a color-forming layer formed on the surface of the base material, and spraying a solvent to react the solvent with the color-forming layer to form the color An inkjet recording method comprising a step of developing a color of a layer.