JPH0621124U - YAG laser marking display parts - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Characters or symbols are achromatic colors with a lightness (V) in the Munsell color system of 3 or more and less than 7, or 3 or more.
Further, there is provided a YAG laser marking display component which does not cause a drastic discoloration or pinhole even when the saturation (C) is 2 or less. [Structure] The upper layer is an ink coating film 3 containing carbon black or graphite or a mixture thereof, and the lower layer is toned with a coloring agent having an absorptivity of 20% or less, and has a lightness (V) of 3 in a Munsell color system. No less than 7 achromatic colors,
Alternatively, the brightness (V) is 3 or more and the saturation (C) is 2
A configuration in which characters and symbols are marked on a member to be marked, which is characterized in that the ink coating film 2 has the following colors.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a YAG laser marking display component used for a panel display device in electric components such as automobile meters and switches.

[0002]

[Prior art]

 Conventional display parts are those in which arbitrary characters and symbols are printed on the surface of a colored plastic molded product, or on the surface of a translucent plastic molded product by mask printing of arbitrary characters and symbols with masking ink. In some cases, when a light source was installed at the rear, blank letters and symbols were illuminated. In recent years, instead of these, more and more characters and symbols are printed with a YAG laser. The structure of this product is one in which ink containing carbon black or graphite is applied to the surface of a colored resin molded product, and the ink coating film is punched by a YAG laser for printing, and a plastic molded product. In some cases, a two-layer ink coating film was provided on the surface of the ink, carbon black or graphite was mixed in the ink of the upper layer, and only this upper ink coating film was punched with a YAG laser for printing. By adjusting the transmittance of the plastics and the ink coating of the lower layer and making the upper layer invisible, the letters and symbols are illuminated when the light source is installed at the rear. Like

[0003]

[Problems to be solved by the device]

 Among the above-mentioned conventional display parts, in the case where the upper layer of the ink coating of two layers is processed by YAG laser for printing, it is necessary to prevent the lower layer ink coating from being processed. However, an achromatic color having a lightness (V) in the Munsell color system of 3 or more and less than 7 or an ink coating of a color having a lightness (V) in the Munsell color system of 3 or more and a saturation (C) of 2 or less. When the film is used as the lower layer and is used as a character color, conventionally, as the black colorant for the toning of this ink, powder consisting of carbon black or graphite alone, or a mixture thereof was used in terms of its coloring power and cost. Was. However, there is a drawback in that even this coating film is processed by absorbing a YAG laser to cause a slight discoloration or pinholes, which makes it impossible to obtain a display component having a desired character color.

The present invention solves the above-mentioned conventional problems, in which characters and symbols have an achromatic color with a lightness (V) of 3 or more and less than 7 in the Mansell color system, so-called whitish gray to dark gray. Alternatively, it is possible to provide a YAG laser marking display component that does not cause discoloration or pinholes even when the lightness (V) in the Munsell color system is 3 or more and the saturation (C) is 2 or less. It is an issue.

[0005]

[Means for Solving the Problems]

 In the YAG laser marking display component of the present invention, the upper layer is an ink coating film containing carbon black or graphite or a mixture thereof, and the lower layer is prepared by using a coloring agent having an absorption rate of 20% or less of a YAG laser having a wavelength of 1064 nm. An achromatic color having a lightness (V) in the Munsell color system of 3 or more and less than 7, which is so-called whitish gray to dark gray, or a lightness (V) in the Munsell color system of 3 or more and a saturation (C). It is characterized in that it is an ink coating film of two or less colors, and the processing characteristics of this material and the YAG laser will be described below.

Considering the physical properties required for display parts (heat resistance, mechanical strength, etc.), the plastics that form the basic skeleton of the material to be marked are ABS resin, AAS resin, methacrylic resin, vinyl chloride resin, polyethylene resin. , General-purpose plastics such as polypropylene resin, or engineering plastics such as polycarbonate resin, polyacetal resin, polyphenylene sulfide resin, polyamide resin, etc. may be selected according to the purpose, whether it is colored or colorless. When the symbol is illuminated, a coloring agent may be kneaded into the plastics for coloring so that the total light transmittance of the illuminated display portion is 5% or more.

The binder of the ink of the lower layer may be selected from polyester resin, methacrylic resin, polyurethane resin, epoxy resin, polycarbonate resin, silicone resin, etc., or their modified products, composites, etc. Considering the properties, it is preferable to use the same type of resin component. The lower ink coating film is an achromatic color having a lightness (V) in the Munsell color system of 3 or more and less than 7, so-called whitish gray to dark gray, or a lightness (V) in the Munsell color system of 3 or more and a color Although the degree (C) is limited to 2 or less, it is important that the colorant that can be used for toning this ink has an absorption rate of 20% or less of a YAG laser having a wavelength of 1064 nm. .

As the black colorant, colorants exhibiting so-called three primary colors of ink: yellow, magenta (red), and cyan (blue), and yellow as cadmium, strontium, chromium, molybdenum, vanadium, and the like. the compound was mainly inorganic pigments and azo groups (-N = N-), a nitroso group (-NO), the organic pigment components that have a nitro group (-NO _2), iron oxide as a magenta (red), cadmium, inorganic pigments and azo groups composed mainly of molybdenum of which compounds (-N = N-), nitroso group (-N O), the organic pigment component having a nitro group (-NO _2), cyan (blue) Examples of the inorganic pigment include ferric ferrocyanide, cobalt aluminate, cobalt stannate, and the like, or phthalocyanine pigment. Or a colorant that exhibits a black color as a single substance, for example, inorganic pigments such as iron oxide (iron black), titanium black, and cobalt oxide, and organic pigments such as aniline black and azomethine azo black. The white colorant may be selected from inorganic pigments such as titanium oxide, zinc chromate, molybdenum white, zinc sulfide, barium sulfate, calcium carbonate and silica, but titanium oxide is preferable from the viewpoint of coloring power and price.

This ink is formed by spray coating, tampo printing, screen printing, coater printing, roll printing or the like so that the thickness of the ink coating film is 3 to 30 μm, preferably 5 to 25 μm. This is because when the thickness is 2 μm or less, the coloring property is poor, and when the thickness is 31 μm or more, it is easy to get a scratched skin.

The binder of the ink in the upper layer may be selected from polyester resin, methacrylic resin, polyurethane resin, epoxy resin, polycarbonate resin, silicone resin, etc., or their modified products, composites, etc., but the lower layer ink coating film It is preferable to use the same type of resin component from the viewpoint of adhesiveness with. In addition, it is important that the carbon black and graphite mixed in the ink of the lower layer are well dispersed so that unevenness does not occur when the ink coating film is processed by the YAG laser. For the purpose of improving the dispersibility in water, it is desirable to add functional groups such as -OH groups and -COOH groups, to treat with various coupling agents, and to perform surface treatment such as UV irradiation. Considering the dispersibility in the resin and the physical properties of the ink coating that forms a powder consisting of carbon black such as 100 nm furnace black, channel black, Ketjen black, acetylene black, etc., or a single graphite of the same particle size, or a mixture thereof. However, 0.5 to 50 wt%, preferably 3 to 20 wt% of the binder (resin content) is added and mixed well. To. Other colorants may be mixed if necessary.

The upper layer ink is also formed to have a thickness of 3 to 30 μm, preferably 5 to 25 μm by the above-mentioned various printing methods. This is also in consideration of the fact that when the thickness is 2 μm or less, the color developability is poor, and when the thickness is 31 μm or more, it is easy to get a wrinkled skin. Using a commercially available beam scanning YAG laser marker or mask image mark YAG laser marker on the marking target thus obtained, remove the upper layer ink coating so that the surface of the lower layer ink coating is exposed. The YAG laser marking display component of the present invention can be obtained by processing and printing.

[0012]

[Action]

 The characteristic of the display component of the present invention is that the lower ink coating film has a lightness (V) of 3 or more and less than 7 in the Munsell color system by using a colorant having an absorption rate of 20% or less of a YAG laser having a wavelength of 1064 nm. Achromatic color, so-called whitish gray to dark gray, or tones with a lightness (V) of 3 or more and a saturation (C) of 2 or less in the Mansel color system. Although the color is adjusted so that the reflection distribution approximates the target color, the ink coating film is not processed because the YAG laser absorption rate at the wavelength of 1064 nm is low. On the other hand, carbon black or graphite is added to the upper layer ink to improve the workability by the YAG laser.

[0013]

【Example】

(Example 1) Titanium oxide or Hansa Brilliant Yellow, which is a coloring agent having a YAG laser absorption rate of 1064 nm or less at 10% or less, is provided at the position where the display of the molded product 1 shown in FIG. 1 in which a colorless transparent polycarbonate resin is injection-molded is provided. , Quinacridone red, and copper phthalocyanine blue were mixed with a methacrylic resin, and a colored paste was mixed at a blending ratio of 100 wt%, 2.7 wt%, 2.7 wt%, and 2.7 wt%, respectively, and a light gray ink was sprayed. It is applied and dried at 85 ° C. for 30 minutes to form a lower layer ink coating film 2 having a thickness of about 20 μm and a total light transmittance of 20%, and an average particle diameter of 15 nm and a specific surface area of 132 BET-m ² / g, tinting strength 127%, carbon black having a YAG laser absorption rate of 98% at a wavelength of 1064 nm and an average particle diameter of 40 nm, a specific surface 50BET-m ² / g, coloring power 75%, a YAG laser absorption yield 95% graphite wavelength 1064 nm 2: the powder mixed at a weight ratio of silica as a surface gloss controlling agent, respectively resin component On the other hand, a black acrylic resin ink mixed with 5 wt% and 0.3 wt% is applied by spraying and dried at 80 ° C. for 30 minutes to form an upper ink coating film 3 having a thickness of about 15 μm. The coating film has a pulse width of 0. The YAG laser marking display parts that the symbol “AIC” formed on the Al vapor deposition mask is punched and printed with a mask type YAG laser marker with a beam diameter of 5 ms and a beam diameter of 15 mm, and the symbol illuminates when a light source is installed behind it. Obtained.

Example 2 On the upper part of a molded article 1 shown in FIG. 2 in which a white transmissive ABS resin is injection molded, titanium oxide, azo, which is a coloring agent having a YAG laser absorption rate of 1064 nm or less of 15% or less. Color ink containing methine azo black mixed in methacrylic resin was mixed with 50 wt% and 50 wt% of each, and the gray ink was roll-printed and dried at 80 ° C for 30 minutes with hot air to a thickness of about 25 μm. An ink coating film 2 as a lower layer is formed on the surface of which an average particle diameter of 25 nm, a true specific gravity of 1.95, graphite having a wavelength of 1064 nm and a YAG laser absorption rate of 93%, and an average particle diameter of 20 nm, a true specific gravity of 1.90, A powder prepared by mixing carbon black having a YAG laser absorptance of 97% at a wavelength of 1064 nm at a weight ratio of 1: 1 and silica as a surface conditioner to the resin component, A black ink made of acrylic resin mixed with 10 wt% and 0.4 wt% of each was sprayed and applied, and dried at hot air of 85 ° C. for 30 minutes to form an upper ink coating film 3 having a thickness of about 20 μm. Was punched with a galvano scanning type YAG laser marker having an output of 50 W and a beam diameter of 0.1 mm, and "1992" was printed to obtain a YAG laser marking display component.

[0015]

[Effect of device]

 By implementing the present invention, a character or symbol is an achromatic color having a lightness (V) in the Munsell color system of 3 or more and less than 7, so-called whitish gray to dark gray, or a lightness (V) in the Munsell color system of 3 or more. It is now possible to produce YAG laser marking display parts with a color saturation (C) of 2 or less. In recent years, especially for the color of the characters and symbols of switch keys used for electrical parts in the car interior, As the needs diversify, the industrial effect of the present invention is great.

[Brief description of drawings]

FIG. 1 shows a YAG laser marking display component according to a first embodiment of the present invention, in which (a) is its plan view,
(B) is a vertical cross-sectional view taken along the line XX.

FIG. 2 shows a YAG laser marking display component according to a second embodiment of the present invention, (a) is a plan view thereof,
(B) is a vertical cross-sectional view taken along the line XX.

[Explanation of symbols]

 1 Molded product 2 Lower layer ink coating 3 Upper layer ink coating

Claims (2)

[Scope of utility model registration request] 1. An upper layer is an ink coating film containing carbon black or graphite or a mixture thereof, and a lower layer has an absorptance of 2 for a YAG laser having a wavelength of 1064 nm.
An achromatic color having a lightness (V) in the Munsell color system of 3 or more and less than 7 or a color having a lightness (V) of 3 or more and a saturation (C) of 2 or less, which is toned using a coloring agent of 0% or less. A YAG made by marking arbitrary characters or symbols on a marked member made of plastics that is an ink coating film
Laser marking display parts. 2. The black colorant used for adjusting the color of the lower layer ink is a mixture of colorants exhibiting the three primary colors of ink: yellow, magenta (red), and cyan (blue). The absorption rate of the YAG laser with a wavelength of 1064 nm is 2
The YAG laser marking display component according to claim 1, which is a black colorant of 0% or less.