JP2000343899A - Back lighting applicable decorative molded product, its manufacture, and decorative film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative molded product, through which a back lighting can be applied, not requiring the necessity of replacement of a light source, and being rich in a color variation. SOLUTION: A decorative film is provided with a pattern layer 4 parted into a light transmitting section 2 and light shielding sections 3 on a base sheet 1, and a light transmitting white layer 5, a light transmitting colored layer 6 and a light transmitting bonding layer 7 are each formed successively on the light transmitting section 2, and the color of the light transmitting section are changed in the state of not transmitting the light from the light source and in the state of transmitting the light, and the difference of hue on the light transmitting section 2 before and after the color change is ΔE=60-100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlit decorative molded product used for audio equipment, home electric appliances and the like, a method of manufacturing the same, and a decorative film.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a decorative molded product capable of being backlit, which changes its color between a state in which light from a light source is not transmitted and a state in which light is transmitted, the surface of a translucent resin molded product is required. A light-transmitting white layer is formed, an outline is formed by a light-shielding portion, and a portion where the light-transmitting white layer is exposed has a shape such as a character. The color of the decorative molded product is white when the light from the light source is not transmitted, and is the color of the light source itself when the light from the light source is transmitted.

[0003]

Conventionally, depending on the color of the light source, when a color other than the color of a certain light source is required,
A light source that developed another color had to be replaced. Replacement of the light source requires disassembly of a finished product such as an audio device in which the light source is incorporated, which is a large-scale, time-consuming and costly operation. Conventionally, when three or more colors are required to be changed in one decorative molded product,
It was necessary to prepare light sources of two or more colors. In this case, it is necessary to form a light-shielding wall that separates the light sources so that adjacent colors are not mixed. Therefore, when actually used in combination with the light source, the number of components is increased and the cost is increased. In addition, LED as a light source
In the case of using LED, the color variation is limited only to the color of the LED itself, so that the color variation is limited. In addition, when an EL sheet is used as a light source, it is expensive because it is difficult to adjust the color tone when a special color is formed in order to give a color variation. Further, when an organic phosphor is mixed to reproduce pastel colors, the organic phosphor promotes deterioration of the ink layer of the EL sheet due to migration or the like.

[0004]

Means for Solving the Problems The present invention has the following constitution in order to solve the above problems. That is, as described in claim 1, a pattern layer divided into a light-transmitting portion and a light-shielding portion is formed on the base sheet, and a light-transmitting white layer and a light-transmitting colored layer are formed on the light-transmitting portion. Each layer of the light-transmitting adhesive layer is sequentially formed, a decorative film in which the color of the light-transmitting portion changes color in a state where light from the light source is not transmitted and in a state where the light is transmitted, and in the light-transmitting portion. Hue difference before and after discoloration is ΔE =
60-100.

According to a second aspect of the present invention, a pattern layer divided into a light-transmitting portion and a light-shielding portion is formed on a base sheet, and a light-transmitting white layer and a light-transmitting colored layer are formed on the light-transmitting portion. A decorative film in which the layers of the light-transmitting adhesive layer are sequentially formed, and the color of the light-transmitting portion changes color in a state where light from the light source is not transmitted and in a state where the light is transmitted. The hue difference before and after the color change in the light-transmitting portion in the peeled state is ΔE = 60 to
100.

According to the third aspect of the present invention, in the above structure, the color of the light transmitting portion and the color of the light transmitting white layer itself are expressed by:
The decorative film may have a hue difference ΔE = 0 to 20 when compared in a state where light from the light source is not transmitted.

According to a fourth aspect of the present invention, in the above structure, the ratio of the thickness of the light-transmitting white layer to the thickness of the light-transmitting colored layer is 1
/ 1 to 30/1 may be a decorative film.

[0008] As described in claim 5, claims 1 to 4
The decorative film according to any one of the above, wherein the decorative film is a backlit decorative molded product formed on the surface of a light-transmitting resin molded product.

[0009] As described in claim 6, claims 1 to 4
The decorative film according to any one of the above, is placed in a mold for injection molding, and after closing the mold, a translucent molding resin is injected into the cavity to form a translucent resin molded product. At the same time, this is a method for manufacturing a decorative molded product capable of backlighting, in which a decorative film is formed on the surface of a resin molded product.

[0010] As described in claim 7, claims 1 to 4
The decorative film according to any one of the above, is placed in a mold for injection molding, and after closing the mold, a translucent molding resin is injected into the cavity to form a translucent resin molded product. At the same time, a decorative film is formed on the surface of the resin molded product,
This is a method for manufacturing a decorative molded product that can be backlit so that a base sheet of a decorative film is peeled off.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the decorative film of the present invention will be described. In the decorative film 12, a pattern layer 4 divided into a light-transmitting portion 2 and a light-shielding portion 3 is formed on a base sheet 1, and a light-transmitting white layer 5, a light-transmitting coloring layer is formed on the light-transmitting portion. Each layer of the layer 6 and the translucent adhesive layer 7 is sequentially formed, and the color of the translucent portion 2 changes color when the light from the light source 14 is not transmitted and when it is transmitted.

As the decorative film 12, there is a film (so-called insert film) which does not peel off the base sheet 1 after the molding resin 11 is adhered to the decorative film 12. Alternatively, as the decorative film 12, a release layer (not shown) is provided between the base sheet 1 and the pattern layer 4, and the base sheet 1 is separated after the molding resin 11 is adhered to the decorative film 12. There is a film (so-called transfer film).

The material of the base sheet 1 includes various resins such as polyethylene terephthalate, polypropylene, acrylic, and thermoplastic elastomer, or a cloth or a nonwoven fabric knitted with various fibers. When the decorative film 12 is an insert film, it must be a base sheet through which light can pass, so that the base sheet 1 needs to have a light transmitting property.

The pattern layer 4 is divided into a light transmitting part 2 and a light shielding part 3. The light-transmitting portion 2 is a portion that represents characters, figures, and the like by being bordered by the light-shielding portion 3. The pattern layer 4 may include only a light-shielding ink layer 41 such as a blank character. Alternatively, the pattern layer 4 is formed of the base sheet 1
In some cases, a light-shielding ink layer 41 for a blank character or the like and a light-transmitting ink layer are formed in this order from the side close to. The light-transmitting ink layer may be formed by various printing methods using a light-transmitting ink obtained by mixing a resin binder and a light-transmitting dye. Since the actual characters, figures, and the like are defined by the light-shielding ink layer 41, the translucent ink layer may be formed larger than the actual characters, figures, and the like. The light-shielding ink layer 41 may be formed by various printing methods using a light-shielding ink using a resin binder and a metal pigment or an inorganic pigment having a masking property. The light-shielding portion 3 of the pattern layer 4 may be formed by a metal deposition layer by a vacuum deposition method or the like.

The light-transmitting white layer 5 may be formed by various printing methods using a light-transmitting ink obtained by mixing titanium white with a transparent resin such as a polyester resin. The thickness of the translucent white layer 5 is preferably 5 to 50 μm. If the thickness is less than 5 μm, the color of the translucent colored layer 6 formed on the back surface can be seen through even in a state where the light from the light source 14 is not transmitted. This is because they can be seen. When the thickness is more than 50 μm, it is difficult to transmit light from the light source 14, and
Because the hue difference before and after discoloration in becomes small, for example,
The luminance in the dark is low, and characters and the like are difficult to recognize, and the discoloration difference between day and night is small, making the design unusable.

The translucent colored layer 6 may be formed by various printing methods using a translucent ink in which a pigment such as carbon black is mixed with a transparent resin such as a polyester resin. The thickness of the translucent colored layer 6 may be determined by the ratio to the thickness of the translucent white layer 5. For example, the translucent white layer 5
The ratio of the thickness of the transparent coloring layer 6 to the thickness of the transparent coloring layer 6 may be 1/1 to 30/1. When the thickness ratio is 30/1 or more, the light transmitting portion 2
Because the hue difference before and after discoloration in becomes small, for example,
The brightness in the dark is low, and the discoloration difference between day and night is small, making it unsuitable as a design. When the thickness ratio is 1/1 or less, the transparent coloring layer 6 formed on the back surface even when the light from the light source 14 is not transmitted.
This is because, for example, if the user wants to be completely white in the daytime, an extra color is seen.

For the light-transmitting adhesive layer 7, a heat-sensitive or pressure-sensitive resin suitable for the material of the molding resin 11 is appropriately used. For example, when the molding resin 11 is an acrylic resin or a urethane resin, a vinyl chloride-vinyl acetate copolymer resin or an acrylic resin may be used as the adhesive layer.

The numerical value of the hue difference before and after the color change in the light transmitting portion 2 is ΔE = 60 to 100. This numerical value is a numerical value of the hue difference measured when the decorative film 12 is an insert film when the decorative film 12 is a transfer film, and is a numerical value of the hue difference when the decorative film 12 is a transfer film. Is the numerical value of the hue difference when measured in the absence of. When the hue difference is less than Δ = 60, the light transmitting portion 2 of the pattern layer 4 in a state where the light from the light source 14 is transmitting does not sufficiently develop color. On the other hand, if the hue difference exceeds ΔE = 100, the hue of the light transmitting portion in a state where the light from the light source 14 is transmitted becomes low and dark, making it difficult to recognize the light transmitting portion in practical use. I will. As a method of measuring the hue, first, the reflectance X1 of the light transmitting portion 2 is measured by the standard light source D65 emitted from the hue measuring device disposed on the base sheet 1 side of the decorative film. Next, light is emitted from a light source disposed on the side of the translucent adhesive layer 6 of the decorative film to transmit the light through the translucent portion 2, and the reflectance X2 of the translucent portion 2 at this time
Is measured by a hue measuring device arranged on the base sheet 1 side. The difference between the reflectivities X1 and X2 is calculated and defined as the hue difference ΔE. In addition, in order to adjust the numerical value of the hue difference so that ΔE = 60 to 100, the density of coloring of the ink constituting the translucent colored layer 6 and the translucent white layer 5 and the thickness of the ink layer may be adjusted. It is good to adjust the size.

In a state where the light from the light source 14 is not transmitted, the numerical value of the hue difference between the color in the light transmitting portion 2 and the color of the light transmitting white layer 5 is ΔE = 0 to 20. When the decorative film 12 is an insert film, the numerical value is a numerical value of the hue difference when measured in a state where the base sheet 1 is present, and when the decorative film 12 is a transfer film, the base sheet This is a numerical value of the hue difference when measured in a state where 1 does not exist. If the hue difference exceeds ΔE = 20, the light-transmitting portion 2 of the pattern layer 4 is buried in the surrounding light-shielding portion 3 in a state where light from the light source 14 is not transmitted, making it difficult to recognize as a character or the like. As a method of measuring the hue, first, a standard light source D65 emitted from a hue measuring device arranged on the base sheet 1 side of the decorative film.
The reflectivity X1 of the light transmitting part 2 is measured. Next, the reflectance X3 of the translucent white layer 5 itself is measured by the standard light source D65 emitted from the hue measuring device arranged on the base sheet 1 side of the decorative film. The difference between the reflectivities X1 and X3 is calculated and defined as the hue difference ΔE. Note that the numerical value of the hue difference is ΔE
= 0 to 20 may be adjusted by adjusting the shading of the ink constituting the light-transmitting colored layer 6 and the light-transmitting white layer 5 and the thickness of the ink layer. .

The color change of the light transmitting portion 2 reflected on the human eye is determined by the light source 1.
When the light from No. 4 passes through the translucent section 2, the color of the translucent white layer 5 changes to a color in which the color of the translucent white layer 5 and the color of the translucent coloring layer 6 are mixed. Will be recognized as follows.

Next, a decorative molded product which can be backlit using the decorative film 12 and a method of manufacturing the same will be described.

First, the decorative film 12 is set in an injection mold. An injection molding die includes, for example, a pair of a movable die 8 and a fixed die 9, and when the die is closed, a cavity 1 having a shape such as an audio device or a home appliance is formed.
0 is formed. The cavity 10 is a space into which the molding resin 11 is injected from an injection gate of the fixed die 9 or an injection gate of the movable die 8 or a gap between the fixed die 9 and the movable die 8. Examples of the shape of the cavity 10 include a flat plate shape and a three-dimensional shape. After placing the decorating film 12 in the injection mold and before injecting the molding resin 11, the decorating film 12 is heated or vacuum-sucked so as to be in close contact with the inner surface of the cavity 10. It may be preformed into a three-dimensional shape. Alternatively, before the decorative film 12 is placed in the injection mold, the decorative film 12 may be preformed into a three-dimensional shape that fits into the cavity. In this case, it is preferable to form a desired shape using a vacuum forming die or a pressure forming die having a concave portion having the same shape as the cavity of the injection molding die, and trim unnecessary portions.

Next, the mold is closed, a light-transmissive molding resin 11 is injected into the cavity 10, and simultaneously with the molding of the light-transmissive resin molded product 13, the surface of the resin molded product 13 is decorated. A film 12 is formed. When the molding resin 11 is solidified, the translucent adhesive layer 7 of the decorative film 12 and the molding resin are fused and firmly adhere to the surface of the translucent resin molded product 13. Examples of the light-transmitting molding resin 11 include an acrylic resin, an acrylonitrile styrene resin, a styrene resin, a polycarbonate resin, and the like, and all of them have a light-transmitting property. A decorative molded product that can be backlit and formed on the surface of the transparent resin molded product 13 is obtained.

In the case where a transfer film is used as the decorative film 12, when the transfer film formed on the surface of the resin molded product is taken out of the mold or after taking it out, the base sheet 1 is further removed. Peel off. In this manner, the light-transmitting adhesive layer 7 on the surface of the light-transmitting resin molded product 13,
The product on which the translucent colored layer 6, the translucent white layer 5, the release layer, and the like are formed is a completed product. What has the function of a light guide plate may be used as the translucent resin molded product 13.

[0025]

EXAMPLE 1 First, an insert film having the following structure was obtained as a decorative film capable of being backlit. Thickness 180
A 25 μm thick light-shielding ink layer comprising carbon black and a polyester resin was formed on a μm polycarbonate film to form a blank character portion and a blank numeral portion.
A 20 μm-thick translucent white layer made of titanium white and a polyester-based resin was formed so as to cover at least the blank character portion and the blank number portion. A translucent colored layer having a thickness of 5 μm and made of a phthalocyanine blue pigment and a polyester resin was formed so as to cover at least the blank letters and blank figures. Further, an adhesive layer having a thickness of 20 μm made of vinyl chloride-vinyl acetate copolymer resin was formed on the translucent colored layer. Each of the above layers was formed by screen printing. Using a standard light source of D65 as a light source and measuring from the polycarbonate film side using “color7” manufactured by Kurashiki Boseki as a hue measuring device, the hue difference before and after the color change in the light-transmitting portion of this insert film was ΔE = 90. Was. When a standard light source of D65 was used as the light source and the color was measured from the polycarbonate film side using “color7” manufactured by Kurashiki Boseki, a hue measuring device, the color in the light transmitting portion and the color of the light transmitting white layer itself were measured. The difference in hue when compared in a state where no light from
Met.

The insert film having the above characteristics is placed in an injection molding die for molding a car audio button for a final product, and 40 minutes from the insert film.
The insert film heated for 8 seconds with a heater having a heat of 320 ° C., which was positioned at a distance of 2 mm, was vacuum-formed and brought into close contact with the inner surface of the mold cavity. After the heater is taken out of the mold, the mold is closed and a translucent molding resin made of PMMA is injected into the cavity, so that the molding of the translucent resin molded product is simultaneously performed on the surface of the resin molded product. A decorative film was formed. Then, after cooling the heat of the resin molded product,
The mold was opened, and the decorative molded product that could be backlit by ejecting the ejector was removed from the mold. The decorative molded product that can be backlit is used as a car audio button. In a state where light from a light source is not transmitted, such as in the daytime, the car audio button was sufficiently recognized as white because the light-transmitting portion in the shape of a character or the like was in contrast to the light-shielding portion. Further, in a state where light from a light source is transmitted, such as in the dark, a blue-colored light-transmitting portion in the shape of a character or the like can be colored as if it clearly emerges in the dark.

Example 2 First, a transfer film having the following structure was obtained as a decorative film capable of being backlit. A thickness of 5 which has been subjected to a release treatment by forming a melamine layer having a thickness of 1 μm.
A 2 μm-thick release layer made of a translucent acrylic resin was formed on a 0 μm low-stretch polyethylene terephthalate film. A 5 μm thick light-shielding ink layer made of carbon black and a polyester resin was formed to form a blank character portion and a blank numeral portion. A 5 μm-thick translucent white layer made of titanium white and a polyester resin was formed so as to cover at least the blank character portion and the blank number portion. A thickness of 1 μm made of a lake red C pigment and a polyester resin so as to cover at least the blank character portion and the blank number portion.
Was formed. Further, a 5 μm thick layer of a vinyl chloride-vinyl acetate copolymer resin is formed on the translucent colored layer.
m of the adhesive layer was formed. Each of the above layers was formed by gravure printing. Using the aiming light source D65 as a light source, and measured from the polyethylene terephthalate film side using "color7" manufactured by Kurashiki Boseki, a hue measuring device,
The hue difference before and after the color change in the translucent portion of the transfer film was ΔE = 95. When the color was measured from the side of the polyethylene terephthalate film using "color7" manufactured by Kurashiki Spinning Co., Ltd., which is a hue measuring device, the light from the light source transmitted the color in the light transmitting portion 2 and the color of the light transmitting white layer itself. The hue difference when compared in the absence was ΔE = 10.

The transfer film having the above characteristics is set in an injection mold for molding a final product household audio button, and after positioning, the heater is positioned 40 mm away from the transfer film. The transfer film heated for 3 seconds was vacuum formed and brought into close contact with the inner surface of the cavity of the mold. After the heater is taken out of the mold, the mold is closed and a translucent molding resin made of PMMA is injected into the cavity, so that the molding of the translucent resin molded product is simultaneously performed on the surface of the resin molded product. A decorative film was formed. afterwards,
After cooling the heat of the resin molded product, the molded product is ejected by the ejector when opening the mold, and at the same time, the polyethylene terephthalate film and the release layer are removed from the surface of the resin molded product, and the decorative molded product that can be backlit is manufactured. Obtained. The decorative molded product that can be backlit is used for home audio buttons. In a state where light from a light source is not transmitted, such as in the daytime, the home audio button was sufficiently recognized as white because the light-transmitting portion in the form of characters and the like was in contrast to the light-shielding portion. Also, in the dark,
In a state where the light from the light source was transmitted, it was possible to develop the color such that the pink light-transmitting portion in the shape of a character or the like clearly emerged in the dark.

[0029]

According to the present invention, since the above-described configuration is adopted, the following effects can be obtained. That is, in the present invention, since the manner of discoloration can be controlled by the color of the translucent colored layer of the decorative film, it is not necessary to change the light source for each color. In other words, there is no need to disassemble a finished product such as an audio device incorporating a light source and replace the light source. It is possible to replace the decorative film on the surface or to selectively perform the color development of one decorative film. You can control the way of discoloration alone. As a result, it is possible to unify the light source to a single color of a long-life and inexpensive LED. In addition, when three or more colors of discoloration are required in one decorative molded product,
Since the light source can be used as it is, there is no need to separate light sources of different colors. Also, the number of parts does not increase.
In addition, variations in discoloration increase. Further, even when a special color such as a pastel color is developed, there is no need to prepare an EL sheet, and the color of the decorative film can be used, so that the problem of deterioration of the ink layer of the EL sheet does not occur.

Further, in the present invention, the hue difference is set to 60 to
In the state where light from the light source is not transmitted, such as in the daytime, the light-transmitting portion having a shape such as a character can be sufficiently recognized as white due to the contrast with the light-shielding portion, and the light source such as in the dark. In the state where the light is transmitted, the color of the light-transmitting colored layer of the decorative film can be colored so that the light-transmitting portion having the shape of a character or the like is clearly raised in the dark.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a decorative film of the present invention.

FIG. 2 is a cross-sectional view showing one step of an embodiment of the method for manufacturing a decorative molded product capable of backlighting according to the present invention.

FIG. 3 is a cross-sectional view showing one embodiment of a decorative molded product capable of backlighting according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base sheet 2 light-transmitting part 3 light-shielding part 4 pattern layer 41 light-shielding ink layer 5 light-transmitting white layer 6 light-transmitting colored layer 7 light-transmitting adhesive layer 8 movable mold 9 fixed mold 10 cavity 11 molding resin 12 decoration Film 13 Translucent resin molded product 14 Light source

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) // B29C 45/14 B29C 45/14 (72) Inventor Hiroyasu Shigeta 3 Mibuhanaicho, Nakagyo-ku, Kyoto-shi, Kyoto Address Nihon Photo Printing Co., Ltd. F-term (reference) 4F100 AA21 AA21H AA37 AA37H AK01E AK15G AK22G AK25 AK41 AK42 AK45 AL01G AR00D AT00A BA04 BA05 BA07 BA10A BA10D BA10E BA42 CA13 EH112 E12BJJJBJJL GBL JN01D JN01E JN02B JN28 YY00 YY00B YY00C 4F206 AA13 AA21 AA28 AD05 AD08 AD20 AG03 AH33 AH39 JA07 JB13 JB23 JF05 JL02 JN11 5C096 BA01 CA13 CB07 CC06 CH02 FA05 FA12

Claims (7)

[Claims] 1. A pattern layer divided into a light-transmitting portion and a light-shielding portion is formed on a base sheet, and a light-transmitting white layer, a light-transmitting colored layer, and a light-transmitting adhesive layer are formed on the light-transmitting portion. Each layer is sequentially formed, a decorative film in which the color of the light-transmitting portion changes color in a state in which light from the light source is not transmitted and in a state in which light is transmitted, and the hue difference before and after the color change in the light-transmitting portion is different. ΔE = 60-1
A decorative film, wherein the number is 00. 2. A pattern layer divided into a light-transmitting portion and a light-shielding portion is formed on a base sheet, and a light-transmitting white layer, a light-transmitting colored layer, and a light-transmitting adhesive layer are formed on the light-transmitting portion. A decorative film in which the layers are sequentially formed, and the color of the light-transmitting portion changes color in a state in which light from the light source is not transmitted and in a state in which light is transmitted, wherein the base sheet is peeled off. The decorative film, wherein the hue difference before and after discoloration in the portion is ΔE = 60 to 100. 3. The color difference between the color in the light-transmitting portion and the color of the light-transmitting white layer itself when the light from the light source is not transmitted is ΔE = 0 to 20. Item 3. The decorative film according to Item 1 or 2. 4. The decorative film according to claim 1, wherein the ratio of the thickness of the light-transmitting white layer to the thickness of the light-transmitting colored layer is 1/1 to 30/1. 5. A decorative molded product capable of backlighting, wherein the decorative film according to claim 1 is formed on the surface of a light-transmitting resin molded product. 6. The film for decoration according to claim 1, which is placed in a mold for injection molding, and after closing the mold,
Backlightable decoration characterized by forming a film for decoration on the surface of the resin molded product at the same time as molding the transparent resin molded product by injecting the light-transmitting molding resin into the cavity. Manufacturing method of molded article. 7. The decorative film according to claim 1, which is placed in an injection molding die, and after closing the die,
By injecting a translucent molding resin into the cavity, a decorative film is formed on the surface of the resin molded product at the same time as the molding of the translucent resin molded product, and the base sheet of the decorative film is peeled off. A method for producing a decorative molded product capable of backlighting.