JP2003175672A - Transfer material for laser etching, and manufacturing method for multi-color molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer material for laser etching wherein the colors of respective coloring layers are not seen while being mixed even when a plurality of coloring layers are laminated, and respective coloring layers clearly develop colors; and a manufacturing method for a multi-color molded article. <P>SOLUTION: On a base body sheet 11 having peelability, at least a concealing layer 14, a plurality of coloring layers 21, 23 and 25, and color development- assisting layers 22, 24 and 26 are formed. In this case, the plurality of coloring layers 21, 23 and 25 are formed on the concealing layer 14, and have different colors from each other. The color development-assisting layers 22, 24 and 26 are formed on respective coloring layers 21, 23 and 25, and used to make the color development clearer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser-etching transfer material and a multi-color transfer material capable of forming an arbitrary multi-color pattern on a resin molded product such as a display panel such as a home electric appliance, an audio device, an indicator of an automobile. The present invention relates to a method for manufacturing a molded product.

[0002]

2. Description of the Related Art Conventionally, as a decoration method by laser etching, a transfer material in which a plurality of colored layers are laminated is transferred onto a resin molded product, and a desired colored layer is removed by laser etching to obtain a multicolor molding. There was a way to get the goods.

That is, as the transfer material, a material having at least a plurality of colored layers having different colors formed on a base sheet having releasability is used. Next, the transfer material is superposed on the surface of the resin molded product, heated and pressed to peel the base sheet, and a plurality of colored layers are formed on the surface of the resin molded product (transfer method). Further, the transfer material is sandwiched in a molding die, molten resin is injected into the molding die, and cooled to obtain a resin molded product, and at the same time, the transfer material is adhered to the surface of the molded product, and then the base sheet is peeled off. , A plurality of colored layers are formed on the surface of the resin molded product (molding simultaneous transfer method). Next, a multicolor molded product can be obtained by irradiating the surface of the resin molded product with a laser to remove an arbitrary colored layer and exposing the colored layers of different colors.

[0004]

However, in the above-mentioned transfer material, a plurality of laminated colored layers interfere with each other. Therefore, after removing an arbitrary layer by laser etching, the coloring of the colored layer exposed on the surface is There is a problem that the color of the colored layer exposed on the surface and the color of the colored layer laminated thereunder are mixed colors. Further, due to such mixed colors, there is a problem in that the brightness of the color of the colored layer is reduced and a clear color cannot be obtained.

Therefore, the present invention solves the above-mentioned drawbacks, and even when a plurality of colored layers are laminated, the colors of the respective colored layers do not appear to be mixed and the laser clearly emits the colored layers. It is an object to provide a transfer material for etching and a method for producing a multicolor molded product.

[0006]

In order to achieve the above objects, the transfer material for laser etching and the method for producing a multicolor molded article of the present invention are configured as follows.

That is, the transfer material for laser etching of the present invention comprises a base sheet having releasability, a hiding layer, and
A plurality of colored layers having different colors on the hiding layer,
At least a coloring auxiliary layer for making the coloring of the coloring layer clear is formed on each coloring layer.

In the above invention, the color-forming auxiliary layer may be white.

In the above invention, CIE (International Commission on Illumination) 1976 (JIS Z8729) L ^* a ^*
b ^{* When} the lightness of the colored layer in the color system is L, the lightness L gradually changes from a low value to a high value as the colored layer moves from a position closer to the base sheet to a position farther from the base sheet. You may comprise.

Further, in the method for producing a multicolor molded product of the present invention, the above-mentioned transfer material for laser etching is fused to a resin molded product by a transfer method or a molding simultaneous transfer method, and the base sheet is peeled off. A hiding layer, a plurality of colored layers having different colors on the hiding layer, and a color-forming auxiliary layer for clarifying the coloring of the coloring layer on each coloring layer, at least a resin molded product formed on the surface Then, the masking layer and optional colored layers were removed by laser etching to expose a plurality of colored layers.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a transfer material for laser etching according to the present invention. FIG. 2 is a sectional view schematically showing an embodiment of a multicolor molded product obtained by the method for manufacturing a multicolor molded product of the present invention. FIG. 3 is a plan view schematically showing an embodiment of a multicolor molded product obtained by the method for manufacturing a multicolor molded product of the present invention. In the figure, 10 is a transfer material for laser etching, 11 is a base sheet, 12 is a release layer, 13
Is a peeling layer, 14 is a concealing layer, 15 is an adhesive layer, 21 is a first coloring layer, 22 is a first coloring auxiliary layer, 23 is a second coloring layer, 24
Is a second coloring auxiliary layer, 25 is a third coloring layer, 26 is a third coloring auxiliary layer, 30 is a multicolor molded product, 31 is a resin molded product, and 32 is an exposure hole.

The laser-etching transfer material of the present invention comprises a masking layer 14 on a base sheet 11 having releasability, and a plurality of colored layers 2 having different colors on the masking layer 14.
1, 23, 25, and at least color forming auxiliary layers 22, 24, 26 for making the color of the colored layers 21, 23, 25 clear on the respective colored layers 21, 23, 25. (See Figure 1).

As the base sheet 11, polyester resin, polypropylene resin, vinyl chloride resin, polyethylene resin, polyethylene terephthalate resin, polycarbonate resin, nylon resin, vinylon resin, acetate resin, polyethylene resin, polyamide resin, polyacrylic resin. A plastic sheet such as a resin or a polyvinyl chloride resin can be used. Base sheet 11
The thickness of 10 to 20 μm is preferably used. Further, by forming hairline-shaped fine irregularities or granular fine irregularities on the surface of the base sheet 11 on which the colored layer is formed, the surface of the multicolor molded product 30 is changed to various matte surfaces. can do. Base sheet 1
It is preferable that 1 has peelability by itself. Further, the release layer 12 may be formed to further stabilize the peeling property. The release layer 12 is formed on the base sheet 11 after the transfer process.
It is a layer that is removed together with. As the material of the release layer 12, silicone resin, melamine resin, alkyd resin,
A curable resin such as an epoxy resin may be used. Examples of the method for forming the release layer 12 include a coating method such as a roll coating method and a spray coating method, and a printing method such as a gravure printing method and a screen printing method.

Further, the base sheet 11 or the release layer 12
Peeling layer 1 as necessary to more reliably peel off
3 may be formed. The peeling layer 13 is a layer that becomes the outermost surface of the transferred material by peeling from the base sheet 11 or the release layer 12 when the base sheet 11 is peeled after transfer or simultaneous molding transfer. Examples of the material of the release layer 13 include acrylic resin, polyester resin, polyvinyl chloride resin,
Cellulose resin, rubber resin, polyurethane resin,
In addition to polyvinyl acetate-based resins, it is preferable to use copolymers such as vinyl chloride-vinyl acetate copolymer-based resins and ethylene-vinyl acetate copolymer-based resins. When the release layer 13 needs to have hardness, a photo-curable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin may be selected and used. The peeling layer 13 may be formed by a gravure coating method, a roll coating method,
There are coating methods such as comma coating method, printing methods such as gravure printing method and screen printing method. The peeling layer 13 is removed together with the concealing layer 14 by laser etching.

The hiding layer 14 is used in the multicolor molded product 30.
This is a layer provided so that the colors of the colored layers 21, 23, and 25 are not directly visible. It is preferable that the color of the colored layers 21, 23 and 25 is completely hidden by the presence of the hiding layer 14. By doing so, the concealing layer 14 is partially removed by laser etching to remove the colored layer 2.
The colors 1, 23 and 25 can be recognized. Hiding layer 1
4 is a layer that can be removed by laser etching. The thickness is preferably thin in order to be removable by a laser, but is preferably thick in order to obtain the concealing property. Therefore, as the material of the concealing layer 14, it is preferable to use a resin in which black or a pigment close to black is mixed such as carbon black. Further, the hiding layer 14 may be a layer other than black. Alternatively, it may have a patterned shape as long as the colored layers 21, 23 and 25 are hidden. The thickness of the hiding layer 14 is preferably 1 to 3 μm.

The colored layers 21, 23 and 25 are formed so that a plurality of colored layers having different colors are laminated. The colored layers 21, 23, and 25 are layers that express the color of the multi-color molded product 30 by exposing the concealing layer 14 and the colored layers 21, 23, and 25 on the surface side thereof by removing them by laser etching. As the number of stacked colored layers 21, 23, 25 increases, a variety of colors can be expressed. Each of the colored layers 21, 23 and 25 can be formed so as to be entirely formed. In addition, each colored layer 21, 23, 2
5 can also be configured to be partially formed. Further, each of the colored layers 21, 23 and 25 may be formed by mixing the entire colored layer and the partial colored layer. Examples of the material of the colored layers 21, 23 and 25 include polyvinyl resin, polyamide resin, polyester resin, acrylic resin, polyurethane resin,
It is preferable to use a colored ink containing a resin such as a polyvinyl acetal resin, a polyester urethane resin, a cellulose ester resin, or an alkyd resin as a binder and containing a pigment or dye of an appropriate color as a colorant. As a method of forming the colored layers 21, 23 and 25, a normal printing method such as a gravure printing method, a screen printing method and an offset printing method may be used. Each colored layer 21, 23, 25
The thickness is preferably 1 to 30 μm. Each colored layer 2
1, 23, 25 can be configured by any color. Further, when each colored layer is composed of four colors of cyan, magenta, yellow and black, an image with a photographic gradation can be expressed.

The brightness of each of the colored layers 21, 23 and 25 is CI
E (International Commission on Illumination) 1976 (JIS Z8729)
Assuming that the lightness of the colored layer in the L ^* a ^* b ^* color system is L, the lightness L increases as the colored layers 21, 23 and 25 move away from the base sheet 11 from the position close to the base sheet 11. May be configured to gradually change from a low value to a high value. That is, the laser tends to be absorbed by the colored layer of lower brightness. Therefore,
By disposing the colored layer having a low lightness L at a position close to the base sheet 11, the colored layer which is easily laser-etched is disposed on the surface side of the multicolor molded article 30, so that the required colored layer is It is possible to prevent accidental laser etching.

The color-forming auxiliary layers 22, 24 and 26 are used in the multi-color molded article 30 in order to prevent the colors of the colored layers 21, 23 and 25 from being mixed with other adjacent colored layers to form a color. It is a layer that is provided so as to be located behind 21, 23 and 25.

The color of the color-forming auxiliary layers 22, 24 and 26 is preferably white. The reason is that it is possible to prevent the colors of the adjacent coloring layers from appearing to be mixed with each other without reducing the brightness of the coloring layers 21, 23 and 25. Further, a metallic luster color obtained by mixing aluminum paste in ink or an achromatic color such as black may be used. Color development auxiliary layers 22, 24, 26
Can be formed by the same means as the colored layers 21, 23 and 25. The thickness of the color forming auxiliary layers 22, 24 and 26 is preferably 1 to 30 μm.

The adhesive layer 15 may be formed if necessary. The adhesive layer 15 is a layer provided on the color-forming auxiliary layer 26 for adhering the transfer material to the resin molded article 31 by the transfer method or the molding simultaneous transfer method. When the material of the resin molded article 31 is polyacrylic resin, it is preferable to use polyacrylic resin as the material of the adhesive layer 15. When the material of the resin molded product 31 is a polyphenylene oxide / polystyrene resin, a polycarbonate resin, a styrene copolymer resin, or a polystyrene blend resin, a polyacrylic resin or polystyrene resin having an affinity for these resins. A polyamide resin or the like may be used as the material of the adhesive layer 15. As a method of forming the adhesive layer 15,
There are coating methods such as gravure coating method, roll coating method and comma coating method, and printing such as gravure printing and screen printing method. The dry film thickness of the adhesive layer 15 is 1 to 5 μm.
It is generally m.

In the ink used for each layer constituting the transfer material, a filler made of inorganic fine powder such as silica, barium sulfate, talc and alumina, and an organic filler such as acrylic beads and urethane beads are used. May be included. In addition, additives such as leveling agents, abrasion resistance enhancers, antistatic agents, and antibacterial agents are added to the ink for the purpose of preventing appearance defects in the printing process, improving the resistance of each layer, and other purposes. May be added to.

The structure of the transfer layer is not limited to the above-mentioned embodiment. For example, in order to express a predetermined pattern, a pattern layer having an arbitrary pattern may be separately formed.

Using the transfer material 10 for laser etching described above, a masking layer 1 is formed by a transfer method or a molding simultaneous transfer method.
4, a plurality of colored layers 21, 23, 25 having different colors on the concealing layer 14, and each colored layer 21, 23, 25.
Coloring auxiliary layer 2 for clearing the coloring of the colored layer
2, 24 and 26 are laminated on the resin molded product 31.

As the resin molded product 31, polystyrene resin, polyolefin resin, ABS resin, AS resin,
A general-purpose resin such as AN resin can be mentioned. Also,
General-purpose engineering resins such as polyphenylene oxide / polystyrene resin, polycarbonate resin, polyacetal resin, acrylic resin, polycarbonate modified polyphenylene ether resin, polybutylene terephthalate resin, ultrahigh molecular weight polyethylene resin, polysulfone resin, polyphenylene sulfide resin, polyphenylene Super engineering resins such as oxide resins, polyarylate resins, polyetherimide resins, polyimide resins, liquid crystal polyester resins and polyallyl heat resistant resins can also be used. Furthermore, a composite resin to which a reinforcing material such as glass fiber or an inorganic filler is added can also be used.

The transfer process by the transfer method is performed as follows. First, the adhesive layer 1 of the transfer material is formed on the surface of the resin molded product 31.
5 side is stuck. Next, using a transfer machine such as a roll transfer machine or an up-down transfer machine equipped with a heat-resistant rubber-like elastic body such as silicon rubber, a temperature of about 80 to 260 ° C. and a pressure of 4
Heat and pressure are applied from the base material sheet 11 side of the transfer material through the heat-resistant rubber-like elastic body set under the conditions of about 90 to 1960 Pa. By doing so, the adhesive layer 15 adheres to the surface of the resin molded product 31. Finally, after cooling, the base sheet 1
When 1 is peeled off, peeling occurs at the boundary surface between the base sheet 11 and the peeling layer 13, and the transfer is completed. Also, the base sheet 1
When the release layer 12 is provided on the sheet 1, the base sheet 11 is peeled off, and peeling occurs at the boundary surface between the release layer 12 and the release layer 13, and the transfer process is completed.

The transfer process by the molding simultaneous transfer method is performed as follows. First, the transfer material is fed into a molding die including a movable die and a fixed die. At that time, the single transfer material may be fed one by one, or necessary portions of the long transfer material may be intermittently fed. When a long transfer material is used, it is advisable to use a feeder having a positioning mechanism so that the transfer material and the molding die are in register. Further, when the transfer material is intermittently fed, the position of the transfer material may be detected by a sensor and then the transfer material may be fixed by a movable die and a fixed die. After closing the molding die, the molten resin is injected and filled from the gate into the resin molding 31.
At the same time as forming, the transfer material is adhered to the surface. After cooling the resin molded product 31, the molding die is opened and the resin molded product 31 is taken out. Finally, the transfer step is completed by peeling off the base sheet 11.

Next, the masking layer 14 and the optional colored layer 2 on the surface of the resin molded product 31 are subjected to laser etching.
1, 23, 25 are removed to obtain a plurality of colored layers 21, 23, 2
Expose 5.

Laser etching uses carbon dioxide, YA
A laser device such as G, ruby, or YVO ₄ is used. , The focus of the laser and the masking layer 14 and the coloring layers 21, 23,
The surface of the resin molded product 31 can be etched to an arbitrary depth by adjusting the relative position of 25, the output of the laser, the number of repetitions of laser irradiation, and the like.

Various colors can be expressed by laser etching the surface of the resin molded product 31 with an arbitrary pattern and depth. Next, three colored layers and three coloring auxiliary layers are formed, and the first coloring layer 21, the first coloring auxiliary layer 22, the second coloring layer 23, the second coloring auxiliary layer 24, the third coloring layer 25, and the third coloring layer 25 are formed. The case where the three-coloring auxiliary layer 26 is configured will be described as an example (see FIGS. 2 to 3).

For example, in order to express a single color which is the color of each colored layer 21, 23, 25 itself, the first colored layer 21,
The first colored layer 21 is exposed by performing laser etching to the depth of the bottom of the concealing layer 14 so that only one of the second colored layer 23 and the third colored layer 25 is exposed, or the first coloring auxiliary layer 22. Laser etching is performed to the depth of the bottom.
The colored layer 23 is exposed or laser etching is performed to the depth of the bottom of the second coloring auxiliary layer 24 to expose the third colored layer 25. For example, in the color A in FIG. 2, a large number of exposed holes 32 are formed by laser etching, and the second colored layer 23
Here is an example where only one is exposed. The maximum inner diameter of one exposed hole 32 is preferably 0.1 to 2.0 mm. If it is less than 0.1 mm, it will be difficult to adjust the laser output. In addition, 2.0m
If it exceeds m, the delicateness will be lacked in the pattern obtained by laser etching. Further, the number of the exposure holes 32 is 10 to 1
It is preferable that the number is 0000 pieces / cm ² . By setting it in this range, a delicate pattern can be obtained. In order to uniformly express the color A, it is preferable that the conditions of laser etching for forming each exposed hole 32 are the same and all exposed holes 32 are formed in the same shape.

In order to express a color in which the colors of the respective colored layers 21, 23 and 25 are mixed, a plurality of colored layers 2 of different colors are used.
A plurality of exposure holes 32 may be formed adjacent to each other so that 1, 23 and 25 are exposed. For example, color B in FIG.
Is the exposure hole 32 where the second colored layer 23 is visible and the third colored layer 2
5 shows an example represented by the exposure hole 32 in which 5 can be seen. The hue of the color B can be changed by changing the area ratio of the exposed holes 32 and the number of the exposed holes 32 of each of the colored layers 23 and 25. Since the second colored layer 23 and the third colored layer 25 having different bottom areas and depths of the exposure hole 32 are exposed, the laser etching conditions are as follows: the case where the exposure hole 32 exposing the second colored layer 23 is formed; This is different from the case of forming the exposure hole 32 that exposes the 3-colored layer 25.

Color C in FIG. 2 corresponds to the first colored layer 2
An example is shown in which the first and second colored layers 23 are exposed through one continuous exposure hole 32 to express a mixed color of the colored layers 21 and 23. The hue of the color C can be changed by changing the area ratio between the first colored layer 21 and the second colored layer 23. In this case, the maximum inner diameter of the exposure hole 32 can be set to about 0.2 to 8.0 mm.

A transparent protective layer (not shown) may be formed on the surface of the multicolor molded product 30 so as to cover the exposed holes 32. The transparent protective layer may be formed using acrylic resin, urethane resin, cellulose resin, ultraviolet curable resin, electron beam curable resin, or the like.

When a transparent resin material is used as the resin molded article 31, a light source is arranged on the back surface of the multicolor molded article 30 so that light is transmitted from a portion where the hiding layer 14 does not exist, It can be used as an illuminating component in which patterns such as characters and symbols emit light.

[0036]

EXAMPLE A polyethylene terephthalate film having a thickness of 38 μm was used as a base sheet, and then a release layer, a hiding layer,
Blue first colored layer, white first coloring auxiliary layer, red second layer
A colored layer, a white second coloring auxiliary layer, a yellow third coloring layer, a white third coloring auxiliary layer, and an adhesive layer were sequentially formed by a gravure coating method to obtain a transfer material for laser etching. The peeling layer, the concealing layer, each colored layer, and each color-forming auxiliary layer were formed using an ink made of an acrylic resin. The adhesive layer was formed using an ink made of vinyl chloride-vinyl acetate copolymer resin.

Next, the thus obtained transfer material for laser etching is placed between molding dies, and after the mold is clamped, a molten resin is injected and integrated, and after the mold is opened, a substrate of the transfer material is formed. The sheet was peeled off to obtain a molded product.

Next, using a YVO ₄ laser device, a large number of exposed holes are formed by laser etching so that the first colored layer, the second colored layer, and the third colored layer are exposed. Obtained.

The multicolor molded article thus obtained was one in which the colors of the respective colored layers were vividly developed without mixing.

(Comparative Example) As a comparative example, a transfer material for laser etching was obtained in the same manner as in the example except that each color-forming auxiliary layer was not formed.

Next, transfer processing was performed in the same manner as in Example 1 to obtain a molded product, and laser etching was performed in the same manner as in Example 1 to obtain a multicolor molded product.

The multicolor molded article thus obtained was a color mixture in which the colors of the respective color layers were influenced by the colors of the other color layers, and the desired color formation could not be obtained.

[0043]

Since the present invention is constructed as described above, it has the following effects.

The transfer material for laser etching of the present invention is
On the base sheet having releasability, a hiding layer, a plurality of colored layers having different colors on the hiding layer, and a color-forming auxiliary layer on each coloring layer for clarifying the coloring of the colored layer are provided. Since it is configured to be formed at least, it is suitable for obtaining a multicolor molded product in which the colors of the respective colored layers do not appear to be mixed even when a plurality of colored layers are laminated and each colored layer vividly develops. It is something.

Further, in the method for producing a multicolor molded product of the present invention, the transfer material for laser etching of the present invention is fused to a resin molded product by a transfer method or a molding simultaneous transfer method, and the base sheet is peeled off. A resin molding in which at least a hiding layer, a plurality of coloring layers having different colors on the hiding layer, and a coloring auxiliary layer for making the coloring of the coloring layer clear on each coloring layer are formed on the surface. After the product was obtained, the concealing layer and any coloring layer were removed by laser etching to expose the plurality of coloring layers, so that the colors of the respective coloring layers were mixed even when the coloring layers were laminated. It is possible to easily obtain a multicolor molded product which is not visible and in which each colored layer clearly develops color.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a transfer material for laser etching of the present invention.

FIG. 2 is a cross-sectional view schematically showing an embodiment of a multicolor molded product obtained by the method for producing a multicolor molded product of the present invention.

FIG. 3 is a plan view schematically showing an example of a multicolor molded product obtained by the method for producing a multicolor molded product of the present invention.

[Explanation of symbols]

10 Laser etching transfer material 11 Base sheet 12 Release layer 13 Release layer 14 Hiding layer 15 Adhesive layer 21 First Coloring Layer 22 First color auxiliary layer 23 Second colored layer 24 Second color development auxiliary layer 25 Third colored layer 26 Third Coloring Auxiliary Layer 30 Multi-color molded products 31 Resin molded products 32 exposed hole

Claims (4)

[Claims] 1. A hiding layer, a plurality of colored layers having different colors on the hiding layer on a base sheet having releasability, and a coloring layer for clarifying the color development on each coloring layer. A transfer material for laser etching, wherein at least a coloring auxiliary layer is formed. 2. The transfer material for laser etching according to claim 1, wherein the color-forming auxiliary layer is white. 3. CIE (International Commission on Illumination) 1976 (J
IS Z8729) When the lightness of the colored layer in the L ^* a ^* b ^* color system is L, the lightness L increases from a lower value as the colored layer moves from a position closer to the base sheet to a position farther from the base sheet. The transfer material for laser etching according to claim 1, which gradually changes to a value. 4. The transfer material for laser etching according to claim 1 is fused to a resin molded product by a transfer method or a molding simultaneous transfer method, and the base sheet is peeled off to form a hiding layer and a hiding layer. A plurality of colored layers having mutually different colors on the top, and a colored auxiliary layer for clearly coloring the colored layers on each colored layer to obtain a resin molded article at least formed on the surface, then laser etching A multicolor molded article, characterized in that the concealing layer and any coloring layer are removed to expose a plurality of coloring layers.