JP2009078531A - Direct uv ink jet printing method for mirror - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to perform direct printing to a mirror by a UV ink jet printer. <P>SOLUTION: The ultraviolet light amount which approaches into the mirror is reduced by composing an ultraviolet absorption layer 3 on the surface of the mirror, thereby it becomes possible to prevent the ink hardening of a head nozzle by ultraviolet light by the scatter reflections. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention provides a technique that enables direct printing on a mirror by a UV inkjet printing method that has been difficult in practical use.

As a direct printing method to a mirror, there is a general screen printing method, but since it is poor in color gradation and reproduction of a photographic image, the printing method is limited in quality and low in versatility.
In addition, UV ink jet printing is also used, but ultraviolet light irradiated to cure the ink is scattered and reflected by the mirror surface, and the reflected light cures the UV ink inside and outside the ink head nozzle of the UV ink jet printer. Therefore, there is a problem that causes clogging of the nozzle, so that the UV ink jet printing method is not adopted.

When direct printing is performed on a mirror by UV inkjet printing, the ultraviolet light irradiated to cure the ink is reflected by the vapor deposition layer 1 of the mirror and scattered and reflected by the glass layer 2, and the reflected light is reflected by the UV inkjet printing machine. Curing the UV ink inside and outside the ink head nozzle causes clogging of the nozzle, and thus it is necessary to suppress scattered reflected light in the mirror.
SUMMARY OF THE INVENTION An object of the present invention is to provide a method that enables direct printing by UV ink jet printing with good color gradation and photographic image reproduction.

A method of tylet printing on a UV inkjet printer using a mirror on which an ultraviolet light absorbing layer is formed.
A direct printing method in which an ultraviolet absorber is added to a base treatment liquid for forming an ultraviolet light absorbing layer.
Direct printing method using titanium oxide, zinc oxide, cerium oxide, benzophenone series, benzotriazole series, octyl series, cinnamic acids, paraaminobenzoic acid series, salicylic acid derivatives as ultraviolet absorbers.

As a method of forming the ultraviolet light absorbing layer 3 on the surface of the mirror, any method may be used as long as a layer capable of absorbing the ultraviolet light wavelength (200 nm to 400 nm) for curing the UV ink can be formed.
Preferably, a method of coating a surface treatment solution applied prior to printing with an ultraviolet absorber added is preferable in terms of production efficiency.
The coating method may be any method as long as it can be uniformly applied on the glass surface, and examples thereof include spray coating, dip coating, roll coating, and spin coating.

Further, the ultraviolet light absorbing layer 3 is preferably transparent in order to maintain the mirror characteristics, but may not be transparent as long as a portion that is not printed after printing can be wiped off.
Further, any ultraviolet absorber may be used as long as it can absorb the above-mentioned wavelength region. Examples thereof include acid-based and salicylic acid derivatives. As long as the effects can be obtained for these uses, they may be used alone, but a mixture of a plurality of them can be used.

In the benzophenone series, 2,4-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone and the like can be exemplified.
In the benzotriazole system, 2- (2′-hydroxy-5′-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5) '-T-octylphenyl) benzotriazole, 2- (3'-t-butyl-2'-hydroxy-5'-methylphenyl) -5-chlorobenzotriazole, 2- (3', 5'-di-t -Amyl-2-hydroxyphenyl) benzotriazole, 2- (3 ', 5'-di-t-butyl-2'-hydroxyphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'- Methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2,2′-methylenebis [6- (2H-benzotriazole 2yl) ) -4- (1,1,3,3-tetramethylbutyl) phenol], α- [3- [3- (2H-benzotriazole 2yl) -5- (1,1-dimethylene) -4-hydroxyphenyl ] -1-Oxopropyl] -ω-hydroxypoly (oxo-1,2-ethanediyl), 4-t-butyl-4-methoxy-benzoylmethane, and the like.

As a result of various studies on the formation of the ultraviolet light absorption layer 3, it can be confirmed from the Examples that the wavelength (280, 360 nm) necessary for curing the UV ink is absorbed by the absorption layer. As a result, the ultraviolet light reduces the scattering and reflection of the mirror, thereby eliminating the cause of clogging of the ink head nozzles of the UV inkjet printing machine, thereby enabling direct printing on the mirror.

In a container having a stirrer, a base treatment agent and an ultraviolet absorber added are stirred. Apply 80 g / m ² to the mirror surface using a well-stirred slurry or a device capable of spraying liquid (Echo GR-310 highly atomized air spray gun manufactured by Keiko Seisakusho). After the surface treatment agent is dried, direct printing is performed with a UV inkjet printer (Fuji Photo Film Inca SP-320).

The surface treatment agent / ultraviolet absorber used in Examples and Comparative Examples is as follows.
Surface treatment agent A: Atomic liquid primer surface treatment agent B: Atomic UV primer UV absorber A: Titanium oxide, manufactured by Ishihara Sangyo Co., Ltd. TTO-S-3 (average particle size / 0.01 to 0.1 μm)
Ultraviolet absorber B: Phenyl salicylate (Kanto Chemical)
Ultraviolet absorber C: 2-hydroxybenzophenone (Kanto Chemical)

The criteria for determining the quality of each physical property are as follows.
(1) Ultraviolet transmittance (measured at 280, 360 nm with an ultraviolet-visible light spectrophotometer) If the transmittance is 5% or less, no problem occurs.
(2) Adhesion after printing (Cross cut method test: Method according to JIS K5600-5-6)
○: Good ×: Peeling (3) Wiping evaluation ○: Wiping is possible ×: Wiping is not possible

Example 1
A 200 ml beaker to which ground treatment agent A / 99.9 g and ultraviolet absorber A / 0.1 g have been added is stirred. A well-stirred mixture was placed in a commercially available spray bottle (30 ml container), and 5 g was sprayed on an A4 size mirror surface. After the surface treatment agent was dried, each physical property measurement and direct printing were performed by a UV inkjet printer. As a result, mirror direct printing was possible.
Examples 2 and 3
It implemented by the same method as Example 1 except having used ultraviolet absorber B, C instead of the ultraviolet absorber A. FIG.
Comparative Example 1
Only the ground treatment agent A was put in a commercially available spray bottle (30 ml container), and 5 g was sprayed on an A4 size mirror surface. After the surface treatment agent was dried, each physical property measurement and direct printing were performed by a UV inkjet printer. As a result, clogging occurred in the ink head nozzles of the printing press.
Comparative Example 2
A 200 ml beaker to which a base treating agent B / 99.9 g and an ultraviolet absorber A / 0.1 g are added is stirred. What was sufficiently stirred was put in a commercially available spray bottle (30 ml container), and 5 g was sprayed on an A4 size mirror surface. After the surface treatment agent was dried, each physical property measurement and direct printing were performed by a UV inkjet printer. As a result, the surface treatment agent coated on the mirror surface could not be wiped off, leaving irregularities.
Comparative Example 3
In a 200 ml beaker, the material obtained by adding the ground treatment agent A / 80 g and the ultraviolet absorber A / 20 g is stirred. What was sufficiently stirred was put in a commercially available spray bottle (30 ml container), and 5 g was sprayed on an A4 size mirror surface. After the surface treatment agent was dried, each physical property measurement and direct printing were performed with a UV inkjet printer. As a result, the adhesion between the mirror surface and the ink was poor, and the ink peeled when a tape peel test was performed.

Screen printing is generally used for printing on a mirror, but there is a limit in quality in reproduction of color gradation and photographic image printing. Direct printing by UV inkjet printing has become possible, enabling high-quality multicolor gradation and photographic image printing.

It is sectional drawing which cut out the mirror from the side surface.

Explanation of symbols

1 mercury vapor deposition layer 2 glass layer 3 UV absorbing layer

Claims (3)

A direct printing method using a UV inkjet printer with a mirror on which an ultraviolet light absorbing layer is formed. The direct printing method according to claim 1, wherein the ultraviolet light absorbing layer is formed by using a surface treatment liquid to which an ultraviolet absorber is added. 3. The direct printing method according to claim 2, wherein titanium oxide, zinc oxide, cerium oxide, benzophenone series, benzotriazole series, octyl series, cinnamic acids, paraaminobenzoic acid series, and salicylic acid derivatives are used as ultraviolet absorbers.

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