JPH0761108A - Multicolor plastic molded product and production thereof - Google Patents

Abstract

PURPOSE:To obtain a multicolor plastic molded product having patterns rich in abrasion resistance and design effect with good productivity. CONSTITUTION:In a multicolor plastic molded product wherein a light pervious dyed part 2 dyed in a character pattern state using a thermal transfer dye, a shading dyed part 3 dyed with a thermal transfer dye and a light pervious undyed part not post-dyed with any dye are provided to the surface layer of a light pervious plastic molded product 1, the character pattern like light pervious dyed part 2 is surrounded by the light provious undyed part 7 and the light pervious undyed part 7 is surrounded by the shading dyed part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor plastic molded product such as a front panel and a switch button of an AV device, a keycap of a personal computer, an instrument panel of an automobile and a method of manufacturing the same.

[0002]

2. Description of the Related Art Multi-colored plastic molded products such as front panels and buttons of AV equipment, keycaps of personal computers, instrument panels of automobiles, etc. are illuminated by light from the back side so that pattern parts such as letters and symbols on the front side are transmitted. The other parts are configured to block light. This type of conventional multicolor plastic molded product is manufactured as follows.

(1) An undercoat layer is formed on a surface of a light-transmissive plastic molded product with a light-transmissive ink containing a coloring pigment, a metal layer is formed on the undercoat layer, and a light-shielding paint is applied on the entire surface. After that, in order to form a blank character pattern, the light-shielding paint and the metal layer are removed by laser etching, and the undercoat layer is exposed only in the blank character portion.

(2) A light-transmissive plastic molding portion in which only a pattern portion such as letters and symbols is projected is injection-molded,
Next, the light-shielding plastic molding part is injection-molded so as to cover all but the protruding part of the light-transmitting plastic molding part, and the light-transmissive plastic molding part and the light-shielding plastic molding part are overlapped to manufacture.

(3) On the surface of a light-transmissive plastic molded product, first, a dye-proof and dyeing ink layer, which is a mixture of a heat transferable dye and a dye-proof resin, is formed by printing and heated to form a light-transmitting dyed portion. Then, a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmissive plastic molded product by printing, and heated to form a light-shielding dyed portion. It is manufactured by removing the dye-proof and dyeing ink on the surface. The area covered with the dye-proof and dye-ink layer on the surface of the light-transmissive plastic molded product has the dye-proof function of the dye-proof and dye-ink, and no light-shielding dyeing part is formed.

[0006]

However, in (1), since an extra layer such as an undercoat layer or a metal layer is formed or laser etching is performed, it takes too much time and labor, and the productivity is low. Was the way. Further, it was a manufacturing method in which only a plastic molded product having two different colors (color tone and color), that is, the color of the light-shielding paint and the color of the undercoat layer, was obtained, and only a product with poor design was obtained. Also,
Forming extra layers such as undercoat layer and metal layer,
Since the laser etching is used, the production cost is too high and the productivity is poor.

In the case of (2), only plastic molded products of two different colors, that is, the ground color of the light-transmitting plastic molding portion and the ground color of the light-shielding plastic molding portion, can be obtained, and in the two-color molding device, the thin line portion is obtained. Was a manufacturing method in which it was difficult to express and only a product with poor design was obtained. In addition, two types of molds and an injection device for injection-molding the light-transmissive plastic molding part and a mold and an injection device for injection-molding the light-shielding plastic molding part must be prepared. It was a manufacturing method in which costs such as equipment costs are incurred as the number of required colors increases with four colors.

(3) Dyeing for forming a light-transmitting dyeing portion on the surface of a light-transmissive plastic molded product by mixing a heat transferable dye and a dye-proofing resin in one ink called a dye-proofing and dyeing ink. It has both a function and a dye-proof function that prevents the formation of a light-shielding dyeing part. Therefore, when the content ratio of the heat transferable dye and the dye-proof resin in the ink is inversely proportional, and when the content ratio of the dye-proof resin is high and the dye-proof function is good, the content ratio of the heat-transfer dye becomes low. As a result, the dyeing function deteriorates, and the color of the light-transmitting dyed part becomes lighter. Alternatively, when the content ratio of the heat transferable dye is high and the dyeing function is good, the content ratio of the dye-proof resin becomes low and the dye-proof function is lowered, and the light-shielding dye is transmitted to the light-transmitting dyeing part. It becomes easy, and the color of the light-transmitting dyed part becomes murky. Therefore, it is a manufacturing method in which a product having a desired color cannot be obtained.

Further, it is necessary to prepare a special material such as a dye having a strong dyeing power or a resin having a strong dye-proofing power so that the respective functions can be sufficiently exhibited even in a small content ratio. Further, as a method for removing the dye-proof and dyeing ink layer, there is washing with water or a solvent, but when the dye-proof and dyeing ink layer is water-based, only the removing method with water can be used. When it is oily, only solvent removal methods can be used. Therefore, it is necessary to select the material of the dye-proof and dye-ink ink according to the type of the method of removing the dye-proof and dye-ink layer, and the type of dye-proof and dye ink that can be used is limited. Therefore, it is a manufacturing method that requires a high production cost because the manufacturing process is restricted. An object of the present invention is to obtain a multicolored plastic molded product having a pattern having excellent wear resistance and designability with high productivity.

[0010]

The multicolored plastic molded article of the present invention comprises a translucent dyeing portion dyed in a character pattern with a heat transferable dye on the surface layer of the translucent plastic molded article, and a heat transferable property. In a multi-colored plastic molded product having a light-shielding dyed portion dyed with a dye and a light-transmissive non-dyeing portion that is not post-dyed with any dye, the light-transmissive dyeing portion in a character pattern is The transparent non-stained portion is surrounded by the light-shielding stained portion.

The multicolored plastic molded article of the present invention is dyed with a heat-transferable dye and a light-transmissive dyeing section which is dyed on the surface layer of the light-transmissive plastic molded article with a heat-transferable dye in a character pattern. In a multicolored plastic molded product having a light-shielding dyed portion and a light-transmissive non-dyed portion that is not post-dyed with any dye, the light-transmissive dyed portion surrounded by the light-transmissive dyed portion is surrounded by the light-transmissive dyed portion. The dyed part is surrounded by the light-shielding dyed part.

Further, the method for producing a multicolored plastic molded product of the present invention comprises forming a transparent dyeing ink layer containing a heat transferable dye in a character pattern on the surface of the transparent plastic molded product, and heating the transparent dyed ink layer. The heat transferable dye in the dyeing ink layer is transferred to the surface layer of the light-transmitting plastic molded product to form a light-transmitting dyeing part in a character pattern to remove the light-transmitting dyeing ink layer, and then the light-transmitting dyeing part. A masking layer having a larger area than the light-transmitting dyeing portion is formed on the upper surface, and then a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmitting plastic molded product. After transferring the heat transferable dye to the surface layer of the light-transmissive plastic molded product where light shielding is required to form a light-shielding dyeing part, the light-shielding ink layer and masking layer are removed, and the light-transmissive dyeing in a character pattern is performed. The part is transparent and non-stained Surrounded by, and configured to obtain a first aspect of the multicolor plastic moldings ToruHikarihi staining section is surrounded by the light blocking staining unit.

Further, the method for producing a multicolored plastic molded product of the present invention comprises forming a transparent dyeing ink layer containing a heat transferable dye in a character pattern on the surface of a transparent plastic molded product, and heating the transparent dyed ink layer. The heat transferable dye in the dyeing ink layer is transferred to the surface layer of the translucent plastic molded product to form a translucent dyeing part in a character pattern, and then a larger area than the translucent dyeing part is formed on the translucent dyeing part. Then, a light-shielding dyeing ink layer containing a heat-transferring dye is formed on the surface of the light-transmitting plastic molded product, and the heat-transferring dye in the light-shielding dyeing ink layer is heated to form a light-transmitting plastic. After forming the light-shielding dyeing part by moving to the surface layer of the molded product that requires light-shielding, the light-transmitting ink layer, the light-shielding ink layer and the masking layer are removed, and the character pattern-like light-transmitting dyeing part is made transparent. By non-staining part Surrounded Te, ToruHikarihi stained portion is configured to obtain a first aspect of the multicolor plastic molding enclosed by the light blocking staining unit.

Further, in the method for producing a multicolored plastic molded article of the present invention, a transparent dyeing ink layer containing a heat transferable dye is formed in a character pattern on the surface of the transparent plastic molded article, and then the transparent A light-shielding dyeing ink layer, in which a masking layer having a larger area than that of the light-transmitting dyeing ink layer is formed on the light-dying ink layer, and then a heat transferable dye is contained on the surface of the portion of the light-transmitting plastic molded product that needs to be light-shielded. The heat transfer dye in the light-transmitting dyeing ink layer and the heat transfer dye in the light-blocking dyeing ink layer are transferred to the surface layer of the light-transmitting plastic molded product by heating to form the light-blocking dyeing part and the light-blocking dyeing part. After that, the light-transmitting dyeing ink layer, the light-shielding dyeing ink layer, and the masking layer are removed, and the light-transmitting dyeing part of the character pattern is surrounded by the light-transmitting non-staining part, and the light-transmitting non-staining part is surrounded by the light-shielding dyeing part. ing And configured to obtain Motomeko 1 multicolor plastic molding.

Further, according to the method for producing a multicolored plastic molded article of the present invention, a transparent dyeing ink layer containing a heat transferable dye is formed on the surface of a transparent plastic molded article in a pattern of letters, and the transparent pattern is formed by heating. The heat transferable dye in the light-dyeing ink layer is transferred to the surface layer of the light-transmitting plastic molded product to form the light-transmitting dyeing part, and by removing the light-transmitting dyeing ink layer, the light-transmitting non-dyeing part in a character pattern is formed. Expose, then
A masking layer having an area covering the light-transmitting non-dyed portion is formed, and then a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmitting plastic molded product, and the light-shielding dyeing ink layer is heated. After the heat transfer dye is transferred to the surface layer of the light-transmissive plastic molded product where light shielding is required to form a light-shielding dyed portion, the light-shielding ink layer and masking layer are removed, and the light-transmissive non-transparent pattern is formed. The multicolor plastic molded article according to claim 2, wherein the dyed part is surrounded by the light-transmitting dyed part and the light-transmitting dyed part is surrounded by the light-shielding dyed part.

Further, in the method for producing a multicolored plastic molded article of the present invention, a transparent dyed ink layer containing a heat transferable dye is formed on the surface of the translucent plastic molded article in a character pattern shape, and the transparent pattern is formed by heating. The heat transferable dye in the light-dyeing ink layer is transferred to the surface layer of the light-transmitting plastic molded product to form a light-transmitting dyeing part, and then a masking layer having an area that covers the blank character pattern of the light-transmitting dyeing ink layer. Then, a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmitting plastic molded product, and the heat-transferable dye in the light-shielding dyeing ink layer is heated to form a light-transmitting plastic molded product. After forming the light-shielding portion by shifting to the surface layer of the portion requiring light-shielding, the light-transmitting ink layer, the light-shielding ink layer, and the masking layer are removed, and the light-transmitting non-staining portion of the character pattern is the light-transmitting dyeing portion. By Surrounded Te, translucent stained portion is configured to obtain a second aspect of the multicolor plastic article surrounded by the light blocking staining unit.

Further, according to the method for producing a multicolored plastic molded article of the present invention, a translucent dyeing ink layer containing a heat transferable dye is formed on the surface of the translucent plastic molded article in a character pattern, and then, Form a masking layer with an area that covers the blank character pattern of the transparent dye ink layer, and then
A light-shielding dyeing ink layer containing a heat-transferable dye is formed on the surface of a portion of the light-transmitting plastic molded article that needs light-shielding, and the heat-transferable dye in the light-transmitting dyeing ink layer and the light-shielding dyeing ink layer in the light-transmitting dyeing ink layer are heated. After transferring the heat transferable dye to the surface layer of the translucent plastic molded product to form the translucent dyeing part, the translucent non-dying part and the shading dyeing part, the translucent dyeing ink layer, the shading dyeing ink layer and the masking layer are formed. The multicolor plastic molded article according to claim 2, wherein the non-light-transmitting dyed portions in the character pattern are surrounded by the light-transmitting dyeing portions, and the light-transmitting dyeing portions are surrounded by the light-shielding dyed portions.

A description will be given below with reference to the drawings. The multicolor plastic molded product of the present invention will be described (FIGS. 1 to 4).
reference). The multicolored plastic molded article of the present invention comprises a translucent plastic molded article 1 having a light-transmitting dyeing portion 2, a light-shielding dyeing portion 3 and a light-transmitting non-dying portion 7 formed on the surface layer thereof.
The translucent dyeing part in the character pattern is surrounded by the translucent non-staining part, the translucent non-staining part is surrounded by the shading dyeing part (see FIG. 1), and the translucent unstaining part in the character pattern is Some are surrounded by a light-transmitting dyeing portion, and the light-transmitting dyeing portion is surrounded by a light-shielding dyeing portion (see FIG. 2).

The light-transmissive plastic molded product 1 is made of a plastic material which has a light-transmitting property and is heat-dyed with a heat transfer dye. For example, it is a molded product molded from polyethylene terephthalate resin, polybutylene terephthalate resin, polycarbonate resin, nylon resin, triacetate resin, diacetate resin, or the like.

These plastic materials may be transparent or semi-transparent, opaque through which light is transmitted, or colored or dyed. For coloring, a coloring material is appropriately added to the molding resin of the molded product. As a coloring material, organic pigments such as phthalocyanine pigment (blue) and azo pigment (yellow), titanium oxide (white), iron oxide (brown), chromium oxide (dark green), ferrocyan (blue), etc. Inorganic pigments, metal powders of aluminum, gold, silver, copper, etc., and sound-sensing discoloration powders. By adding these coloring materials, colors that cannot be produced by dyeing, for example, white, metallic luster, pearl luster, gray, etc., will appear in the translucent non-dyed portion described later. Examples of the dyeing material include disperse dyes, basic dyes and acid dyes.

In the light-transmitting dyeing section 2, the surface layer of the light-transmitting plastic molded article 1 is formed in a character pattern (see FIG. 1) or a blank character pattern (see FIG. 1) by a heat-transferring dye having a light-transmitting property such as a disperse dye. (See 2)). When the light-transmitting dyeing portion 2 is formed in a character pattern (see FIG. 1), the light-transmitting dyeing portion 2 is surrounded by a light-transmitting non-dying portion described later. When the translucent dyeing portion 2 is formed in a blank character pattern (see FIG. 2), a translucent non-staining portion, which will be described later, appears in the blank character portion of the translucent dyeing portion 2, and a light-shielding dyeing portion which will be described later. It will be surrounded by 3. The character pattern is a pattern of characters, symbols, numbers, pictures, and the like.

The transparent dyeing section 2 may be formed in two or more different colors (see FIG. 4). The depth of dyeing of the transparent dyeing part 2 is 5 μm or more from the surface of the transparent plastic molded product 1
A depth of 00 μm or less is preferable. If it is less than 5 μm, the abrasion resistance is insufficient, and if it is more than 100 μm, the dyeing is bleeding.

The light-transmissive non-stained portion 7 is a portion of the undyed transparent plastic molded product in the ground color. That is, the light-transmissive non-staining portion 7 is not a portion to be post-dyed like the light-transmitting dyeing portion 2 and the light-shielding dyeing portion 3. This does not deny that the plastic material forming the transparent plastic molded product is colored. When the plastic material forming the transparent plastic molded product is colored, the light-transmissive non-stained portion 7 is colored.
When the translucent dyeing part 2 is formed in a character pattern (see FIG. 1).
(See), the light-transmitting non-staining part 7 is surrounded by the light-shielding dyeing part 3 described later. In addition, when the translucent dyeing part 2 is formed in the shape of a blank character (see FIG. 2)
Means that the transparent non-stained portion 7 appears in a portion of the transmissive stained portion 2 which is a blank character.

The light-shielding dyeing portion 3 is a portion where the surface layer of the light-transmissive plastic molded product 1 is dyed with a heat-transferable dye having a light-shielding property such as a disperse dye. The depth of dyeing of the light-shielding dyeing part 3 is 10 from the surface of the transparent plastic molded product 1.
A depth of μm or more is preferable. By forming the light-shielding dyeing part 3 in the light-transmitting dyeing part 2 or the light-transmitting non-dying part 7, characters or symbols may be formed.

A method of manufacturing a multicolor plastic molded product of the present invention will be described (see FIGS. 5 to 8). First, claim 3
The method for producing the multicolor plastic molded article described in any one of 5 to 6 will be described. First, the light-transmissive dyeing ink layer 4 containing a heat-transferable dye is formed in a character pattern on the surface of the light-transmissive plastic molded product 1, and the heat-transferable dye in the light-transmissive dyeing ink layer 4 is translucent by heating. The translucent dyeing part 2 having a character pattern is formed by transferring to the surface layer of the plastic molded product 1 (see FIG. 5).

The light-transmissive plastic molded product 1 is the same as the light-transmissive plastic molded product 1 described for the multicolor plastic molded product of the present invention.

The light-transmitting dyeing ink layer 4 transmits light,
Any material containing a colored heat transfer dye may be used. For example, when a red disperse dye, a water-soluble acrylic resin, an extender pigment such as calcium carbonate, a dispersant such as naphthalenesulfonic acid, water, an ink mixed with n-butyl alcohol, etc. is formed by a screen printing method or the like. Good. Character patterns are characters, symbols,
It is a pattern such as numbers and pictures.

The light-transmitting dyeing ink layer 4 may have two or more light-transmitting dyeing portions 2 formed by using light-transmitting dyeing inks having two or more heat transfer dyes of different colors (see FIG. 4). ). Further, the light-shielding ink layer may be formed in a character pattern in parallel with the light-transmitting dyeing ink layer 4. In this case, letters and symbols by light-shielding dyeing are formed surrounded by the light-transmitting dyeing part 2 and the light-transmitting dyeing part 7.

The heating is carried out at a temperature and for a time such that the heat transferable dye in the transparent dyeing ink layer 4 can dye the surface layer of the transparent plastic molded article 1. The temperature and time may be adjusted depending on the combination of the material of the heat transferable dye and the material of the translucent plastic molded product 1. For example, as the translucent plastic molded product 1, polybutylene terephthalate resin,
When the red disperse dye is used as the light-transmitting dyeing ink layer 4, it is preferable to heat at about 150 ° C. for 2 minutes. The translucent dyeing portion 2 formed by heating the translucent dyeing ink layer 4 is formed by transferring the character pattern of the translucent dyeing ink layer 4 as it is.

The heating of the transparent dyeing ink layer 4 may be carried out immediately after the transparent dyeing ink layer 4 is formed. Alternatively, after the light-shielding dyeing ink layer 6 described below is formed, the light-shielding dyeing ink layer 6 may also be heated.

The removal of the light-transmitting dyeing ink layer 4 after the heat-transfer dye has been heat-transferred may be carried out immediately after heating the light-transmitting dyeing ink layer 4. Alternatively, after the light-shielding dyeing portion 3 is formed on the surface layer of the light-transmissive plastic molded product 1, the light-shielding dyeing ink layer and the masking layer 5 may be removed by washing with water, a solvent, or the like.

Next, a masking layer 5 having a larger area than the transparent dyeing section 2 is formed on the transparent dyeing section 2 (see FIG. 6). When the light-shielding dyeing portion having a character pattern is formed in parallel with the light-transmitting dyeing portion 2, the masking layer 5 is formed so as to cover the light-shielding dyeing portion. The masking layer 5 is a layer that prevents the light-shielding dye in the light-shielding dyeing ink layer 6 from dyeing the light-transmitting dyeing portion 2. Masking layer 5
For example, by using an ink mixed with a cellulosic resin, an extender pigment such as calcium carbonate, etc., an ink layer is formed by a screen printing method or the like, and heated at 100 ° C. for 20 minutes to cure the ink layer. It is good to form.

The masking layer 5 has two or more transparent dyeing parts 2
When formed, each of the light-transmitting dyeing portions 2 may be formed with an area larger than the size of the light-transmitting dyeing portion 2.
You may form so that it may straddle on each translucent dyeing part 2.

Next, a light-shielding dyeing ink layer 6 containing a heat-transferable dye is formed on the surface of the light-transmitting plastic molded article 1 (see FIG. 7), and the heat-transferring dye in the light-shielding dyeing ink layer 6 is heated to remove the heat-transferable dye. Then, the light-transmitting plastic molded product 1 is moved to the surface layer of the portion requiring light shielding to form the light-shielding dyeing portion 3.

The light-shielding dyeing ink layer 6 may have any color as long as it contains a heat transferable dye having a color capable of blocking light. For example, a black disperse dye, a water-soluble acrylic resin, water, an ink mixed with isopropyl alcohol, or the like may be used, and may be formed by a screen printing method, a spraying application method, a dipping method, a printing method, or the like.

The size of the light-shielding dyeing ink layer 6 may be formed on the entire surface of the light-transmissive plastic molded product 1 by covering the masking layer 5, or a part of the surface of the light-transmissive plastic molded product 1 may be formed. You may leave it and form only in the part which needs light shielding.

The heating is carried out at a temperature and for a time at which the heat transferable dye in the light-shielding dyeing ink layer 6 transfers heat to the surface layer of the light-transmitting plastic molded product 1. The temperature and time may be adjusted depending on the combination of the material of the heat transferable dye and the material of the translucent plastic molded product 1. For example, when a polybutylene terephthalate resin is used as the light-transmissive plastic molded product 1 and the black disperse dye is used as the light-shielding dyeing ink layer 6, it is preferable to heat at about 150 ° C. for 5 minutes. Shading dyeing section 3
The depth of dyeing is preferably 10 μm or more from the surface of the translucent plastic molded product 1.

Next, the McKing layer 5 and the light-shielding dyeing ink layer 6 are removed. When the masking layer 5 is removed, the light-shielding dyeing portion 3 dyed by the light-shielding dyeing ink layer 6,
The non-stained light-transmitting non-stained portion 7 appears.

In the multicolored plastic molded product thus obtained, for example, as shown in FIG. 4, the light-transmitting dyeing part 2 in the character pattern of ON and OFF is surrounded by the light-transmitting non-dying part 7. The non-light-transmitting dyeing part 7 is surrounded by the light-blocking dyeing part 3. In this multicolored plastic molded product, the characters themselves ON and OFF emit colored light when illuminated from the back side, and the other parts are shielded.

A method of manufacturing the multicolor plastic molded product according to claims 6 to 8 will be described. First, the translucent dyeing ink layer 4 containing a heat transferable dye is formed on the surface of the translucent plastic molded product 1 in a character pattern, and the heat transferable dye in the translucent dyeing ink layer 4 is transferred by heating. Of the transparent plastic molded product 1 is formed on the surface layer of the transparent plastic molded product 1 to form a translucent dyeing part 2 in the form of a blank character pattern. The light non-stained portion 7 is exposed.

The heating of the transparent dyeing ink layer 4 may be performed immediately after the transparent dyeing ink layer 4 is formed. Alternatively, after the light-shielding dyeing ink layer 6 described below is formed, the light-shielding dyeing ink layer 6 may also be heated. Further, the removal of the light-transmitting dyeing ink layer 4 after the heat-transferring dye has been heat-transferred may be performed immediately after heating the light-transmitting dyeing ink layer 4, or the surface layer of the light-transmitting plastic molded product 1. Light-shielding dyeing part 3
After the layer is formed, it may be removed together with the light-shielding dyeing ink layer and the masking layer 5 by washing with water or a solvent.

Next, the masking layer 5 having an area that completely covers the characters not to be drawn on the light-transmitting dyed ink layer or the light-transmitting non-dyed portion 7 is formed.
To form. The masking layer 5 may be of any size with respect to the transparent dyeing ink layer or the transparent dyeing part, as long as it has a size enough to cover the blank characters of the transparent dyeing part.

Next, a light-shielding dyeing ink layer 6 containing a heat transferable dye is formed on the surface of the transparent plastic molded product 1,
By heating, the heat transferable dye in the light-shielding dyeing ink layer 6 is transferred to the surface layer of the light-transmissive plastic molded product 1 in a portion requiring light-shielding to form the light-shielding dyeing portion 3. The light-shielding dyeing ink layer 6 may be formed on the entire surface of the light-transmissive plastic molded product 1 so as to cover the masking layer 5, or it is necessary to shield light by leaving a part of the surface of the light-transmissive plastic molded product 1. You may make it form only in the part to be.

Next, the McKing layer 5 and the light-shielding dyeing ink layer 6 are removed. When the masking layer 5 is removed, the light-shielding dyeing portion 3 dyed by the light-shielding dyeing ink layer 6,
The non-stained light-transmitting non-stained portion 7 appears.

[0045]

The multicolor plastic molded product according to the present invention has, in addition to the dyeing parts such as the light-transmitting dyeing part and the light-shielding dyeing part, the light-transmitting non-dying part exhibiting the ground color of the light-transmitting plastic molded product.
Therefore, when illuminated from the back side of the multi-colored plastic molded product according to the present invention, the light-transmitting dyeing part is transmitted in color, the light-blocking dyeing part blocks light, and the light-transmitting non-dying part is the ground color of the plastic molded product. It is transparent.

In the method for producing a multicolored plastic molded article according to the present invention, the heat transferable dye and the dye-proof resin are not mixed in one ink layer. That is, in the present invention, the two ink layers, the light-transmitting dye ink layer and the masking layer, are used separately. Therefore, the light-transmitting dyeing ink layer exerts only the dyeing function of forming the light-transmitting dyeing portion, and the masking layer exerts the dye-proofing function of preventing the dyeing portion from being formed in a portion which is not desired to be dyed.

Even if the masking layer is water-based or oil-based, if the light-transmitting dye ink layer is removed, the masking layer is inevitably removed, so that the range of materials for the dye-proof resin used for the masking layer can be widened. .

[0048]

The multicolor plastic molded product according to the present invention has the following effects because of the constitution and operation as described above. That is, when illuminated from the back side of a multi-colored plastic molded product, the light-transmitting dyed part is colored, the light-blocking dyed part is light-shielded, and the light-transmitting non-dyeing part is light-transmitted in the background color of the light-transmitting plastic molded product. Therefore, it becomes a multi-colored plastic molded product of three or more different colors and is excellent in design.

Further, in the method for producing a multicolored plastic molded article according to the present invention, the light-transmitting dyeing ink layer exhibits a dyeing function and the masking layer exhibits a dye-proofing function. The content ratio of the migration dye is sufficient, and the color of the light-transmitting dyed portion has a desired density. Further, the content ratio of the dye-proof resin in the masking layer is sufficient to completely block the transmission of the dye in the light-shielding dye ink layer. Therefore, it is not necessary to use a special material as the dye or the dye-proof resin.

Further, in the method for producing a multicolored plastic molded product according to the present invention, it is not necessary to prepare a special material, there is plenty of room for selecting a material, and the production cost is low.
Productivity is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a multicolor plastic molded product of the present invention.

FIG. 2 is a sectional view showing an embodiment of a multicolor plastic molded product of the present invention.

FIG. 3 is a sectional view showing an embodiment of a multicolor plastic molded product of the present invention.

FIG. 4 is a perspective view of a multicolor plastic molded product of the present invention.

FIG. 5 is an explanatory cross-sectional view showing that a light-transmitting dyeing ink layer is formed on a light-transmitting plastic molded product and dyed in the method for producing a multicolor plastic molded product of the present invention.

FIG. 6 is an explanatory cross-sectional view in which a masking layer is formed in the method for producing a multicolor plastic molded product of the present invention.

FIG. 7 is an explanatory cross-sectional view in which a light-shielding dyeing ink layer is formed in the method for producing a multicolor plastic molded product of the present invention.

FIG. 8 is an explanatory cross-sectional view in which a light-shielding dyeing portion is formed and a masking layer is removed in the method for producing a multicolor plastic molded product of the present invention.

[Explanation of symbols]

 1 Light-transmissive plastic molded product 2 Light-transmitting dyeing part 3 Light-shielding dyeing part 4 Light-transmitting dyeing ink layer 5 Masking layer 6 Light-shielding dyeing ink layer 7 Light-transmitting non-dying part

Claims (8)

[Claims] 1. A light-transmitting dyeing part dyed in a character pattern with a heat-transferable dye, a light-shielding dyeing part dyed with a heat-transferring dye, and a dye In a multi-colored plastic molded product having a non-stained, non-stained, non-stained transparent part, the translucent stained part of the character pattern is surrounded by the non-stained transparent part, and the non-stained non-stained part is surrounded by the shaded stained part. A multicolored plastic molded product characterized by being 2. A light-transmissive dyeing part dyed in a character pattern with a heat-transferable dye on a surface layer of a light-transmissive plastic molded product, a light-shielding dyed part dyed with a heat-transferable dye, and any one of the dyes. In a multi-colored plastic molded product that has a non-stained, non-stained, non-stained transparent part, the transparent non-stained part of the character pattern is surrounded by the transparent dye part, and the transparent stained part is surrounded by the light-shielding dye part. A multicolored plastic molded product characterized by being 3. A light-transmissive dyeing ink layer containing a heat-transferable dye is formed in a character pattern on the surface of a light-transmissive plastic molded product, and the heat-transferable dye in the light-transmissive dyeing ink layer is translucent by heating. Transfer to the surface layer of the plastic molded product to form a translucent dyeing part in a character pattern to remove the translucent dyeing ink layer, and then, a masking layer having a larger area than the translucent dyeing part on the translucent dyeing part. Then, a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmitting plastic molded product, and the heat-transferable dye in the light-shielding dyeing ink layer is heated to shield the light-transmitting plastic molded product from light. After forming the light-shielding dyeing part by moving it to the surface layer of the part requiring the light-shielding ink layer and the masking layer, the light-transmitting dyeing part of the character pattern is surrounded by the light-transmitting non-dyeing part. The non-stained area is surrounded by the shaded area A method for producing a multicolored plastic molded article, characterized in that the multicolored plastic molded article according to claim 1 is obtained. 4. A translucent dyeing ink layer containing a heat transferable dye is formed in a character pattern on the surface of a translucent plastic molded product, and the heat transferable dye in the translucent dyeing ink layer is translucent by heating. Transfer to the surface layer of the plastic molded product to form a letter-patterned light-transmitting dyeing part, then form a masking layer on the light-transmitting dyeing part that has a larger area than the light-transmitting dyeing part. A light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of a plastic molded product, and the heat transferable dye in the light-shielding dyeing ink layer is transferred to the surface layer of the light-transmitting plastic molded product where light shielding is required by heating. After forming the light-shielding dyeing part, the light-transmitting ink layer, the light-shielding ink layer and the masking layer are removed, and the light-transmitting dyeing part of the character pattern is surrounded by the light-transmitting non-dying part. Is surrounded by the shading dyeing section A method for producing a multicolor plastic molded article, comprising obtaining the multicolor plastic molded article according to claim 1. 5. A translucent dyeing ink layer containing a heat transferable dye is formed in a character pattern on the surface of a translucent plastic molded product, and then a layer larger than the translucent dyeing ink layer is formed on the translucent dyeing ink layer. An area masking layer is formed, and then a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmissive plastic molded product where light-shielding is required. After transferring the heat transferable dye in the heat transferable dye and the light-shielding dyeing ink layer to the surface layer of the light-transmitting plastic molded product to form the light-transmitting dyeing part and the light-shielding dyeing part, the light-transmitting dyeing ink layer, the light-shielding dyeing ink The multicolor plastic molded product according to claim 1, wherein the layer and the masking layer are removed, and the translucent dyed portion of the character pattern is surrounded by the translucent undyed portion and the translucent undyed portion is surrounded by the light-shielding dyed portion. Characterized by getting Method for manufacturing multicolored plastic molded products. 6. A translucent dyeing ink layer containing a heat transferable dye is formed on a surface of a translucent plastic molded product in a pattern of letters and the heat transferable dye in the translucent dyeing ink layer is transmissive by heating. To form a light-transmitting dyeing part by transferring to the surface layer of a water-soluble plastic molded product, and exposing the light-transmitting dyeing ink layer to expose the light-transmitting non-dying part in a character pattern, and then,
A masking layer having an area covering the light-transmitting non-dyed portion is formed, and then a light-shielding dyeing ink layer containing a heat transferable dye is formed on the surface of the light-transmitting plastic molded product, and the light-shielding dyeing ink layer is heated. After the heat transfer dye is transferred to the surface layer of the light-transmissive plastic molded product where light shielding is required to form a light-shielding dyed portion, the light-shielding ink layer and masking layer are removed, and the light-transmissive non-transparent pattern is formed. The method for producing a multicolor plastic molded product according to claim 2, wherein the dyed part is surrounded by the light-transmitting dyeing part and the light-transmitting dyeing part is surrounded by the light-shielding dyeing part. 7. A light-transmitting dye ink layer containing a heat-transfer dye is formed on the surface of a light-transmitting plastic molded product in a pattern of letters, and the heat-transfer dye in the light-transmitting dye ink layer is light-transmitted by heating. Of the transparent plastic molded product to form a light-transmitting dyeing part, then a masking layer having an area covering the blank character pattern of the light-transmitting dyeing ink layer is formed, and then the light-transmitting plastic molded product. Form a light-shielding dyeing ink layer containing a heat-transferable dye on the surface of the product, and transfer the heat-transferable dye in the light-shielding dyeing ink layer to the surface layer of the light-transmitting plastic molded product that requires light-shielding to shield light. After forming the part, the translucent ink layer, the light-shielding ink layer and the masking layer are removed, and the translucent unstained part of the character pattern is surrounded by the translucent dyed part, and the translucent dyed part is surrounded by the light-shielding dyed part. Surrounded A method for producing a multicolor plastic molded product, comprising obtaining the multicolor plastic molded product according to claim 2. 8. An area for forming a translucent dyeing ink layer containing a heat transferable dye on the surface of a translucent plastic molded product in a pattern of a blank character, and then covering the blank character pattern of the transparent dyeing ink layer. Forming a masking layer of
A light-shielding dyeing ink layer containing a heat-transferable dye is formed on the surface of a portion of the light-transmitting plastic molded article that needs light-shielding, and the heat-transferable dye in the light-transmitting dyeing ink layer and the light-shielding dyeing ink layer in the light-transmitting dyeing ink layer are heated. After transferring the heat transferable dye to the surface layer of the translucent plastic molded product to form the translucent dyeing part, the translucent non-dying part and the shading dyeing part, the translucent dyeing ink layer, the shading dyeing ink layer and the masking layer are formed. The multicolored plastic molded article according to claim 2, wherein the translucent non-stained portion having a character pattern is surrounded by the translucent stained portion, and the translucent stained portion is surrounded by the light-shielding stained portion. Manufacturing method of multicolored plastic molded products.