JPH11152437A - Diffractive ink and diffractive ink printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a diffractive ink affording rainbow-colored and clearly manifested printed patterns by the aid of its diffractive effect, and to provide a printing method using the ink. SOLUTION: A ferromagnetic reflective layer 5 is subjected to direct vacuum deposition onto an emboss-reproduced layer 3 provided in the form of relief diffraction grating or relief hologram; subsequently, a ferromagnetic field is applied to the emboss-reproduced layer 3 in a prescribed orientation direction to magnetize the reflective layer 5; thereby, even after peeling and grinding the emboss-reproduced layer 3 accompanied by the reflective layer 5, a magnetized state remains on the resulting thin film powder 10; therefore, if a magnetic field is applied to gravure-coated thin film powder 10, the thin film powder 10 orients in the direction of the magnetic field, resulting in the original relief pattern turned in the same direction, thus a printed pattern 12 can be seen in a rainbow-colored fashion by the aid of diffractive effect and manifested clearly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffractive ink and a method for printing a diffractive ink, and more particularly to a diffractive ink and a method for printing a diffractive ink in which a printed pattern appears iridescent and vividly floats due to a diffraction effect.

[0002]

2. Description of the Related Art Conventionally, there has been known an ink in which an optical interference film obtained from a laminate of a titanium oxide thin film and a coating film is powdered and colored by an interference color. There is also known a method in which a reflection type relief diffraction grating or a reflection type relief hologram is powdered and sprinkled on an adhesive pattern to obtain a pattern that looks rainbow-colored by a diffraction action.

[0003]

In the case of the above-mentioned ink which is colored by the interference color, the interference color of the coating film cannot be controlled finely because of the thin film powder composed of the laminated film.
Also, the reflected light was scattered and could not form an image. In addition, the thin film powder has a large particle size, and only silk printing can be selected, and lacks mass productivity.

In the case of a method in which a reflection type relief diffraction grating or the like is powdered and sprinkled on an adhesive pattern, the powder must be handled as it is, and there is a problem in that the powder is sucked and harms health.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a diffractive ink in which a print pattern appears rainbow-colored and vividly floats due to a diffraction effect, and a printing method using the ink. Is to provide a way.

[0006]

In order to achieve the above object, in the present invention, a reflection layer made of a ferromagnetic material is directly deposited on an embossed duplication layer formed on a relief diffraction grating or a relief hologram. By applying a strong magnetic field in a certain orientation direction to the embossed replication layer to magnetize the reflection layer, the magnetization remains in the thin film powder even after peeling and pulverization of the embossed replication layer with the vapor deposition reflection layer. Therefore, when a magnetic field is applied to the gravure-coated thin film powder, the thin film powder is oriented in the direction of the magnetic field, and the original relief pattern surface is oriented in the same direction. It looks like a color and comes out brightly. The pattern that generates the diffracted light is not formed in the laminating direction of the thin film as in the ink that develops the interference color, but is embossed on the surface. It is possible to control the color of the pixels. In addition, a pattern in which the hue changes depending on the viewing direction can be easily formed. An image can also be formed by using a relief hologram. In addition, the deposition of the reflection layer made of a ferromagnetic material
Since the process is performed following the embossed duplication layer, pixels can be formed regardless of the front and back of the reflection layer.

Further, since the embossed duplication layer has a thickness of about 1 to 2 μm and the thickness of the vapor deposition reflection layer does not exceed 0.1 μm, the particles of the thin film powder have a diameter of only about 2 μm. Fine pixel formation by printing is possible.

That is, the diffraction ink of the present invention comprises an embossed resin layer having a relief pattern of a relief type diffraction grating or a relief type hologram embossed on the surface thereof, and a ferromagnetic material which follows the relief pattern surface of the embossed resin layer. A fine powder formed by crushing a laminate comprising a reflective layer formed by vapor deposition of a reflective layer magnetized by applying a strong magnetic field in a certain orientation direction to the embossed resin layer Is dispersed in a solvent to form an ink.

Further, according to the diffractive ink printing method of the present invention, after printing a predetermined pattern on the surface of a printing medium using the above-described diffractive ink, a magnetic field is applied in a predetermined direction before the solvent dries, so that individual The method is characterized in that the relief pattern surface is reoriented according to the direction of the magnetic field by orienting the fine powder.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a diffraction ink and a method for printing a diffraction ink of the present invention will be described based on examples. Example 1 As shown in the cross section in FIG. 1, a methacrylic resin having a thickness of 1 μm was applied as a release layer 2 on a PET film 1 having a thickness of 25 μm, and a melamine acrylate resin dispersed in a solvent was applied thereon. 1 μm of radiation-curable resin layer 3
After coating and drying, the surface of the radiation-curable resin layer 3 is micro-embossed by hot pressing using a nickel plating plate on which a relief pattern of a relief type diffraction grating has been formed by resist exposure to form a relief pattern 4. The relief type diffraction grating was manufactured by copying and then irradiating ultraviolet rays to cure the resin layer 3.

A reflective layer 5 is formed by depositing iron as a ferromagnetic material on the relief pattern 4 to a thickness of 200.degree. To form a reflective relief type diffraction grating which gives bright diffracted light. After the reflective layer 5 is deposited, this reflective relief diffraction grating is generated between the opposed permanent magnets 6 and 7.
It was passed through a strong magnetic field of 0 kGauss at a speed of 10 m / min, and was magnetized so that different magnetic poles were formed on the front and back of the reflective layer 5.

The laminate is rubbed against a roll of epoxy resin at a high speed of 600 m / min and blown by a strong wind to obtain a P
The reflection-type relief-type diffraction grating formed on the surface of the ET film 1 was blown off from the release layer 2 to obtain a fine reflection-type relief-type diffraction grating film piece.

Further, the film piece was crushed by blowing air at a rate of 200 m / sec in a cyclone to make fine particles, thereby obtaining fine particles 10 having an average particle diameter of 2 μm (FIG. 2).

A gravure ink was prepared by mixing 20% of the fine particles, 20% of ink varnish (manufactured by Toray Industries, Inc., Byron 200) and 60% of methyl ethyl ketone as a solvent.

Using this gravure ink, as shown in FIG. 2, a pattern coat 12 of a character pattern having a film thickness of 6 μm is applied on a substrate 11, and 2.5 kGauss generated between permanent magnets 13 and 14 is formed. When passing through the magnetic field at a speed of 20 m / min, as shown schematically in FIG. 2, the position or direction of the reflective layer 5 of the fine particles 10 in the pattern coat 12 is, for example, as shown in FIG. 3 and oriented parallel to the surface of the pattern coat 12.

FIG. 3 is a schematic view when the pattern coat 12 is viewed from the surface. The relief diffraction grating patterns 4 of all the fine particles 10 are directed to the surface. 3 centered on the surface normal
It is randomly distributed between 60 °. Therefore, when the pattern coat 12 was viewed from any direction, the printed pattern appeared rainbow-colored, and clearly appeared above the background, similarly to the reflection type diffraction grating.

Example 2 As shown in cross section in FIG. 1, a 1 μm thick methacrylic resin was applied as a release layer 2 on a 25 μm thick PET film 1 and melamine acrylate was dispersed in a solvent. The radiation-curable resin layer 3 made of resin is coated and dried by 1 μm, and then hot-pressed on the surface of the radiation-curable resin layer 3 using a nickel plating plate on which a relief pattern of a relief type diffraction grating is formed by resist exposure. The relief pattern 4 was duplicated by micro embossing, and then the resin layer 3 was cured by irradiating ultraviolet rays to produce a relief type diffraction grating.

A reflective layer 5 was formed by depositing cobalt as a ferromagnetic material at a thickness of 150.degree. On the relief pattern 4 to form a reflective relief type diffraction grating which gives bright diffracted light. After the reflective layer 5 is deposited, the reflective relief diffraction grating is passed through a strong magnetic field of 10 kGauss generated between the opposed permanent magnets 6 and 7 at a speed of 10 m / min. Were magnetized so as to generate different magnetic poles on the front and back sides.

The laminate was rubbed against a roll of epoxy resin at a high speed of 600 m / min and was exposed to a strong wind, thereby
The reflection-type relief-type diffraction grating formed on the surface of the ET film 1 was blown off from the release layer 2 to obtain a fine reflection-type relief-type diffraction grating film piece.

Further, in order to make the film pieces into fine particles, the film pieces were crushed by blowing air at a rate of 200 m / sec in a cyclone to obtain fine particles 10 having an average particle diameter of 2 μm (FIG. 2).

A gravure ink was prepared by mixing 20% of these fine particles, 20% of ink varnish (manufactured by Toray Industries, Inc., Byron 200) and 60% of methyl ethyl ketone as a solvent.

Using this gravure ink, as shown in FIG. 2, a pattern coat 12 of a character pattern having a film thickness of 6 μm is formed on a substrate 11, and 2.5 kGauss generated between permanent magnets 13 and 14 is formed. When passing through the magnetic field at a speed of 20 m / min, as shown schematically in FIG. 2, the position or direction of the reflective layer 5 of the fine particles 10 in the pattern coat 12 is, for example, as shown in FIG. 3 and oriented parallel to the surface of the pattern coat 12.

FIG. 3 is a schematic diagram when the pattern coat 12 is viewed from the surface, and the relief diffraction grating patterns 4 of all the fine particles 10 are directed to the surface. 3 centered on the surface normal
It is randomly distributed between 60 °. Therefore, when the pattern coat 12 was viewed from any direction, the printed pattern appeared rainbow-colored, and clearly appeared above the background, similarly to the reflection type diffraction grating.

It is to be noted that if a certain orientation direction in which the ferromagnetic reflective layer following the relief pattern surface is magnetized is a direction intersecting the embossed resin layer on which the relief pattern surface is formed, each of the individual print patterns is formed. When the fine powder is oriented, as shown in FIG. 2, the fine powder can be easily oriented parallel to the plane of the printed matter simply by passing the printed matter through a magnetic field in which the N pole and the S pole are opposed to each other. The print pattern looks bright in rainbow colors.

[0025]

As is apparent from the above description, according to the present invention, a reflection layer made of a ferromagnetic material is directly deposited on an embossed duplication layer formed on a relief diffraction grating or a relief hologram. By applying a strong magnetic field in a fixed orientation direction to magnetize the reflection layer, the magnetization remains in the thin film powder even after peeling and pulverization of the embossed duplication layer with the vapor deposition reflection layer. Therefore, when a magnetic field is applied to the gravure-coated thin film powder, the thin film powder is oriented in the direction of the magnetic field, and the original relief pattern surface is oriented in the same direction. It looks like a color and comes out brightly.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a method for producing fine particles dispersed in a diffraction ink of the present invention.

FIG. 2 is a diagram for explaining a printing method using the diffraction ink of the present invention.

FIG. 3 is a schematic diagram when a pattern coat by printing using the diffraction ink of the present invention is viewed from the surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... PET film 2 ... Release layer 3 ... Radiation-curable resin layer 4 ... Relief pattern 5 ... Reflective layer 6, 7 ... Permanent magnet 10 ... Fine particle 11 ... Substrate 12 ... Pattern coat 13, 14 ... Permanent magnet

Claims (2)

[Claims] An embossed resin layer having a relief pattern of a relief type diffraction grating or a relief type hologram embossed on the surface thereof, and a ferromagnetic material formed by vapor deposition of a ferromagnetic material following the relief pattern surface of the embossed resin layer. A fine powder formed by crushing a laminate comprising a reflective layer and a reflective layer magnetized by applying a strong magnetic field in a certain orientation direction to the embossed resin layer is dispersed in a solvent. Diffraction ink characterized by being converted into an ink. 2. After printing in a predetermined pattern on the surface of a printing medium using the diffraction ink according to claim 1, a magnetic field is applied in a predetermined direction before the solvent is dried to orient each fine powder. Wherein the relief pattern surface is reoriented in accordance with the direction of the magnetic field.