JP5793908B2 - Decorative films and decorative molded products - Google Patents

Description

  The present invention relates to a decorative film for film insert molding used for providing a complicated design in a small digital device such as a mobile phone, and a decorative molded product manufactured using the decorative film.

Conventionally, as a method of imparting a complicated design (for example, a wood grain pattern) to a plastic molded product, for example, there are methods described in Patent Documents 1 to 3.
In the method described in Patent Documents 1 to 3, first, a decorative film is formed by forming a pattern by a printing method on a base film formed using an acrylic film or polyethylene terephthalate. .

  Then, after the decorative film formed as described above is put into an injection mold and the mold is closed, a molten resin such as acrylonitrile-butadiene-styrene copolymer resin, acrylic resin, polycarbonate resin or the like is used. In this method, the pattern and the molding resin are integrated so that the base film becomes the outermost layer by injection molding. That is, the method described in Patent Documents 1 to 3 is a so-called simultaneous molding decoration method.

In the above method and the like, as a method of forming a pattern, a general printing method (for example, gravure printing, offset printing, silk screen printing, flexographic printing) is assumed, but an actual product includes gravure printing, Or, in many cases, only one of silk screen printing is used.
Regarding the proper use of both (gravure printing and silk screen printing), silk screen printing, which requires a short plate-making time, is often used in the case of producing a small variety of products. On the other hand, a fine design is required, and gravure printing is often used when producing a certain amount.

As mentioned above, one of the reasons why two types of gravure printing and silk screen printing are frequently used as a method for forming a pattern is that the molten resin for injection molding is dark. In this case, it is necessary to increase the thickness of the ink so as to conceal the color of the molding resin.
In other words, in printing methods using lithographic or relief printing such as offset printing and flexographic printing, the ink film thickness is as thin as about 1 μm to 2 μm, and conditions are examined (selecting plate specifications, adjusting ink viscosity) Etc.) is inferior to silk screen printing in which 5 μm or more and 10 μm can be laminated with a thickness within the following range.

  Gravure printing or silk screen printing may be used when printing a pattern that incorporates a transparent and brilliant design, such as a pearl, when you want to express deeply with the thickness of the ink layer. Many.

Japanese Patent Laid-Open No. 10-16498 Japanese Patent Laid-Open No. 10-71680 Japanese Patent No. 4194670

Incidentally, gravure printing is a printing method that can increase the ink film thickness and is suitable for light and shade printing as compared to offset printing. However, gravure printing is difficult to apply to commercial production of small lots and short delivery times due to the time required for plate making.
On the other hand, when silk screen printing is used, plate making does not take much time compared to gravure printing, and as a result, the price of the plate is also low. However, when silk screen printing is used, there is a limitation on the minimum opening diameter that can be resolved by the silk screen plate, so it is difficult to express gradation of grayscale, and the printing speed is lower than that of gravure printing or offset printing. Will also be late.

In other words, when gravure printing or silk screen printing is used as a method to give a complex design to a plastic molded product, a decorative film with a design that requires gradation expression is commercially available in small lots and short delivery times. It was difficult to produce.
The present invention has been made in order to solve the above-mentioned problems, and can be produced in a small lot and in a short delivery time, and has a decorative film and a decorative film provided with a design that requires gradation expression. It is an object to provide a molded product.

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention includes a glitter layer, a pattern layer, a concealing layer in this order, or the pattern layer, the glitter layer, A decorative film formed by laminating in the order of the concealing layer,
The base film is formed of a polyethylene terephthalate film or an acrylic film,
The glitter layer and the concealing layer are laminated by silk screen printing,
The pattern layer is laminated by UV offset printing ,
The thickness of the hiding layer is characterized in der Rukoto the range of 20μm or 50μm or less.

Next, of the present invention, the invention described in claim 2 is an invention dependent on claim 1, wherein the bright layer is a mixture of at least a vinyl chloride / vinyl acetate copolymer and an acrylic resin. Or a mixture containing at least 30% by weight of pearl pigment produced by multilayer coating of titanium oxide on mica or fine glass powder for transparent ink produced with a mixture of polyester resin And
The pattern layer is produced by a mixture of at least a pigment and an ultraviolet curable resin,
The concealing layer is provided, wherein at least a pigment, the mixture was mixed vinyl chloride-vinyl acetate copolymer and an acrylic resin, or the Tei Rukoto generated with a mixture obtained by mixing at least a pigment and a polyester resin.

Next, of the present invention, the invention described in claim 3 is an invention dependent on claim 1 or claim 2, comprising an adhesive layer laminated on the surface of the concealing layer,
The adhesive layer includes at least one of vinyl chloride / vinyl acetate copolymer, acrylic resin, polyester resin, and urethane resin,
The thickness of the adhesive layer is in the range of 3 μm or more and 10 μm or less.

Next, among the present inventions, the invention described in claim 4 is a decorative molded product comprising the decorative film described in claim 3 and a molded resin laminated on the surface of the adhesive layer. There,
The decorative film and the molding resin are fixed by insert molding or vacuum molding.

It is sectional drawing which shows schematic structure of the decorating film in 1st embodiment of this invention. It is sectional drawing which shows schematic structure of the decorative molded product (film insert molded product) in 1st embodiment of this invention. It is a figure which shows the shaping | molding die of a mold open state. It is a figure which shows the shaping die in a mold closed state. It is a figure which shows an example of an intermediate decoration molded product. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a figure which shows an example of a decorative molded product. It is the VIII-VIII sectional view taken on the line of FIG. It is sectional drawing which shows schematic structure of the decorating film in the modification of 1st embodiment. It is sectional drawing which shows schematic structure of the decorative molded product in the modification of 1st embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings. Note that this embodiment is an example of the present invention and does not limit the present invention.
(Constitution)
First, the structure of the decorative film of this embodiment is demonstrated using FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of a decorative film in the present embodiment.
The decorative film 1 is a member that forms a film insert molded product that is a decorative molded product. As shown in FIG. 1, on the surface of the base film 3, a glitter layer 4, a pattern layer 5, and a concealing layer 7. The adhesive layers 9 are sequentially laminated. In the following description, “decorative molded product” and “film insert molded product” indicate the same members.

(Configuration of base film 3)
As the base film 3, a polyethylene terephthalate film or an acrylic film is used. That is, the base film 3 is made of a polyethylene terephthalate film or an acrylic film. Although the thickness of the base film 3 is not particularly defined, it is suitable because it is easy to handle the range of 50 μm or more and 200 μm or less. In addition, the base film 3 is formed into a quadrangular shape (rectangle, square) having a certain size before performing the step of forming the bright layer 4, which is a subsequent step of the step of forming the base film 3.

  Moreover, as a material of the base film 3, it is preferable to use a material kneaded with an ultraviolet absorber. This is because the base film 3 is a film that becomes the outermost surface layer of the film insert molded product. Therefore, by providing the base film 3 with an ultraviolet absorbing function, the glitter layer 4, the pattern layer 5, and the concealing layer 7 are formed. This is because discoloration due to exposure to ultraviolet rays can be reduced.

In this case, typical ultraviolet absorbers applicable as the material of the base film 3 include 2,4-dihydroxybenzophenone, 2- (2H-benzotriazol-2-yl) -4-t-butylphenol, and the like. There is.
On one side of the base film 3 (the side opposite to the side on which the glitter layer 4 is laminated, the upper side in FIG. 1), the base film is formed after the decorative film 1 or film insert molded product is formed. A coat layer (not shown) may be provided so that 3 is the outermost layer. In this case, for example, when a base material having inferior surface hardness is used as the base film 3, it is possible to improve the surface hardness by providing a hard coat with a coating layer on one side of the base film 3. .

(Configuration of the glitter layer 4)
The glitter layer 4 is a layer laminated on the surface of the substrate film 3 (on the lower surface in FIG. 1), and is formed by being laminated on the surface of the substrate film 3 by silk screen printing. ing.
Further, the glitter layer 4 is a layer made of ink that emits gloss similar to pearls, and is provided with a unique glitter feeling of pearls by a printing method. Therefore, as the ink constituting the glitter layer 4, for example, “pearl ink” formed by mixing transparent ink with pearl pigment powder in a mass ratio of 30% or less is used.
Specifically, the “pearl ink” constituting the glitter layer 4 is mainly composed of a mixture of a vinyl chloride / vinyl acetate copolymer and an acrylic resin, or a polyester resin. By adding a catalyst such as a resin and drying it at a temperature of about 80 ° C. to 100 ° C., the pearl pigment powder is added to a transparent ink having a property of increasing the resin crosslinking density as compared with the case where no catalyst is added. In addition, it is prepared and formed.

As the pearl pigment powder, a mica or glass fine powder is coated with a multilayer of titanium oxide, and an inorganic pigment having a property of shining in various colors by the effect of interference light is used. Typical examples of the pearl pigment powder include “Microglass Metashine Series” manufactured by Nippon Sheet Glass Co., “Miraval” manufactured by Merck.
Here, when forming the “pearl ink”, if the pearl pigment powder is mixed with the transparent ink in a ratio exceeding 30% by mass, the pearl pigment powder is clogged in the opening of the silk screen plate. The ratio of the pearl pigment powder to the weight is 30% or less as a mass ratio.

The optimum mixing ratio when mixing the pearl pigment powder with the transparent ink varies depending on the particle size of the pearl pigment powder, but when a pearl pigment powder having a particle size of 50 μm is used, the mass ratio is 5% or more and 20%. It is desirable to be within the range of% or less. Moreover, the glitter layer 4 may be laminated | stacked on the whole surface of the printable area | region of the base film 3 according to the objective, and may be limited to partial lamination | stacking.
The silk screen printing ink used for forming the glitter layer 4 is one that does not easily cause an ink flow with respect to the flow of the injected molten resin when performing insert molding (described later) using the decorative film 1. Is used.

In addition, the thickness of the glitter layer 4 can be as high as about 300 ° C. or several hundred megapascals that can be applied to the decorative film 1 for several seconds to several tens of seconds during insert molding using the decorative film 1. Any thickness that can withstand the pressure may be used, but when the durability is insufficient, the thickness of the glitter layer 4 is appropriately increased.
As described above, the glitter layer 4 is formed into a mica or glass fine powder with respect to a transparent ink formed from a mixture of at least a vinyl chloride / vinyl acetate copolymer and an acrylic resin, or a mixture of at least a polyester resin. It is produced from a mixture containing a pearl pigment produced by multilayer coating of titanium oxide in a proportion of 30% or less by mass.

(Configuration of pattern layer 5)
The pattern layer 5 is a layer laminated on the surface of the glitter layer 4 (on the lower surface in FIG. 1), and is laminated on the surface of the glitter layer 4 by an offset printing method. . The thickness of the pattern layer 5 is 2 μm or less.
When the pattern layer 5 is formed by the offset printing method, the number of screen lines is 175 lines or more per inch in order to form a design excellent in gradation expression, which is one of the effects in the present embodiment. It is desirable to carry out printing so as to make In this case, the design pattern to be printed is reverse printing (in the molded product using the decorative film 1 of the present embodiment, the design pattern is viewed from the side opposite to the printed surface through the base film 3). Note that.

As the printing ink for forming the pattern layer 5, a UV curable offset printing ink mixed with an ultraviolet curable resin is used.
The reason for using the UV-curable offset printing ink is that the base film 3 is a non-absorbing base material, so that the solvent-based ink, which is premised on the penetration of the ink component into the base material, is used. The adhesion to the base film 3 is difficult to obtain. In addition, the UV-curable offset printing ink requires a shorter drying time than the solvent-based ink, and thus has a high production efficiency per hour.

The colors of the offset printing ink forming the pattern layer 5 are CMYK (Cyan, Magenta, Yellow, Yellow, Key).
Many colors such as a process color consisting of a plate)), a special color ink by toning, an ink in which metal particles are dispersed, a transparent ink, and the like can be expressed.
In particular, in the case of producing a molded product that requires light resistance, as an offset printing ink for forming the pattern layer 5, a color material component having high light resistance (for example, indigo phthalocyanine blue, red quinacridone red, yellow) It is possible to use printing inks containing monoazo yellow).

That is, the offset printing ink forming the pattern layer 5 is mixed with the above-described ultraviolet curable resin and a pigment made of the above-described ink. Therefore, the pattern layer 5 is produced by a mixture obtained by mixing at least a pigment and an ultraviolet curable resin.
Moreover, as offset printing ink which forms the pattern layer 5, it is desirable to use what has high adhesiveness with respect to the base film 3 and the glitter layer 4. FIG. In this case, as a measure of the adhesion required for the base film 3 and the glitter layer 4, the part peeled off after performing the test by the method defined in “JIS K 5600-5-6”. The standard is not allowed.

  Moreover, in order to improve the adhesiveness of the offset printing ink which forms the pattern layer 5, and the base film 3, other than the method mentioned above, for example, easy adhesion processing such as corona discharge to the base film 3 May be applied.

(Configuration of concealment layer 7)
The masking layer 7 is a layer that is laminated on the surface of the pattern layer 5 (on the lower surface in FIG. 1), and is formed by being laminated on the surface of the pattern layer 5 by silk screen printing. .
Further, the concealing layer 7 is a portion that becomes the base of the bright layer 4 and the pattern layer 5 when forming the film insert molded article, and the adhesive layer 9 formed in a step subsequent to the step of forming the concealing layer 7 This is a layer provided to conceal the color of the molding resin described later.
The silk screen printing ink for forming the masking layer 7 is the same as the silk screen printing ink for forming the glitter layer 4 described above, and when performing the insert molding (described later) using the decorative film 1, the masking layer 7 is Use a material that does not easily cause ink flow relative to the flow of molten resin to be injected.

The silk screen printing ink for forming the concealing layer 7 is mainly composed of a mixture of vinyl chloride / vinyl acetate copolymer and acrylic resin, or a polyester resin, similar to the silk screen printing ink for forming the glitter layer 4. In addition, by adding a catalyst such as polyisocyanate resin to this main component and drying it at a temperature of about 80 ° C. to 100 ° C., the resin crosslinking density is increased compared to the case where no catalyst is added. Use ink that has the property to do.

The thickness of the masking layer 7 is preferably 20 μm or more, and the color of the ink containing the pigment forming the masking layer 7 can be a color matched to the pattern layer 5 in addition to white. is there.
Here, the reason why the thickness of the masking layer 7 is preferably 20 μm or more is that the colors of the bright layer 4 and the pattern layer 5 which are the base when forming the film insert molded product are necessary and sufficient by the masking layer 7. However, in order to conceal the transmittance of the concealing layer 7 to about 20%, the thickness of the concealing layer 7 is set to 20 μm or more. Because it is necessary to do.

  Further, if the total thickness of the masking layer 7 is 50 μm or less, the masking property (the ratio at which the masking layer 7 blocks light) increases as the thickness increases, and the ink flow during insert molding is reduced. In consideration of the amount of material that can be used, it is preferable to determine the thickness within a range of 20 μm to 50 μm. This is because when the thickness of the concealing layer 7 exceeds 50 μm, the concealing property reaches its peak, and this is not preferable from the viewpoint of cost and labor in consideration of the amount of material used.

As described above, the masking layer 7 is formed of at least a pigment, a mixture of a vinyl chloride / vinyl acetate copolymer and an acrylic resin, or a mixture of at least a pigment and a polyester resin.
In the present embodiment, the thickness of the masking layer 7 is set in the range of 20 μm or more and 50 μm or less.

In addition, when laminating the masking layer 7 on the surface of the pattern layer 5 and the pattern layer 5, the masking layer 7 may be stacked with a target thickness by silk screen printing once. It does not limit and you may laminate | stack by dividing into multiple times.
Here, when the concealing layer 7 is laminated by a plurality of times of silk screen printing, if necessary, the color of the ink for silk screen printing for overprinting may be made different. In this case, for example, after the pattern layer 5 is formed, printing is performed with a white silk screen printing ink, and then a similar printing is performed using a gray or black silk screen printing ink. By forming the concealing layer 7, it is possible to reduce the light transmittance of the entire concealing layer 7 and improve the concealing performance of the concealing layer 7.

(Configuration of adhesive layer 9)
The adhesive layer 9 is a layer laminated on the surface of the masking layer 7 (on the lower surface in FIG. 1), and is formed by stacking on the surface of the masking layer 7 by silk screen printing. .
In the present embodiment, the thickness of the adhesive layer 9 is in the range of 3 μm to 10 μm.
This is because the adhesive layer 9 needs to have a thickness of at least 3 μm in order to perform its function. Moreover, if the thickness exceeding 10 μm is laminated, it is not preferable because the adhesive layer 9 which is a soft layer compared to other layers may be broken as a peeling surface.
The adhesive layer 9 is a layer disposed between the above-described concealing layer 7 and a molding resin to be described later. In order to obtain closeness as the film insert molded product by bringing the concealing layer 7 and the molding resin into close contact with each other. It is a layer installed in

The color of the adhesive layer 9 is preferably colorless and transparent so as not to affect the color tone of the masking layer 7 and the pattern layer 5.
As the silk screen printing ink for forming the adhesive layer 9, the adhesive layer 9 is injected when insert molding (described later) using the decorative film 1 is performed, as in the silk screen printing ink for forming the concealing layer 7. A material that does not easily cause ink flow is used for the molten resin flow.

  In addition, the adhesive layer 9 is a vinyl chloride / vinyl acetate copolymer, acrylic resin, polyester resin, and urethane as an adhesive for silk screen printing that has resistance to the injection resin together with the above silk screen printing ink. A resin made of at least one of the resins is used. In this case, it is possible to use those containing cyclohexanone or xylene as the diluent solvent component.

  As described above, the adhesive layer 9 of the first embodiment is formed to include at least one of a vinyl chloride / vinyl acetate copolymer, an acrylic resin, a polyester resin, and a urethane resin, and has a thickness of 3 μm or more. It is in the range of 10 μm or less.

(Composition of decorative molded product)
Hereinafter, the structure of the decorative molded product provided with the decorative film 1 of the present embodiment will be described using FIG. 2 with reference to FIG.
FIG. 2 is a cross-sectional view showing a schematic configuration of a decorative molded product (film insert molded product) in the present embodiment.
As shown in FIG. 2, the decorative molded product 13 includes the decorative film 1 and the molding resin 11 described above.
The molded resin 11 is a layer formed by solidifying the molten resin injected to the adhesive layer 9 side in the decorative film 1, and is laminated on the decorative film 1. That is, the molding resin 11 is a layer laminated on the surface of the adhesive layer 9 (on the lower surface in FIG. 2).
Moreover, the molding resin 11 and the decorative film 1 are fixed by insert molding or vacuum molding.

(Method for producing decorative molded products)
Hereinafter, the manufacturing method of the decorative molded product of this embodiment is demonstrated using FIGS. 3-9, referring FIG.1 and FIG.2. In this embodiment, the case where the molding resin 11 and the decorative film 1 are fixed by insert molding will be described.
Hereinafter, the decorative film 1 formed in a quadrilateral shape with a certain size is placed in a mold for injection molding to perform mold closing, and then the molten resin is injected into the mold, The process of manufacturing the decorative molded product 13 in which the decorative film 1 is adhered to the surface will be described by taking it out when it is solidified.
Since the decorative film 1 is formed into a three-dimensional shape by the above process, the two-dimensional pattern formed on the decorative film 1 is matched to the expansion and contraction of the decorative film 1 at the time of injection molding. It is necessary to adjust the size.

FIG.3 and FIG.4 is sectional drawing which shows schematic structure of the metal mold | die for injection molding (molding metal mold | die) used for manufacture of a decorative molded product. FIG. 3 is a diagram showing the molding die in the mold open state, and FIG. 4 is a diagram showing the molding die in the mold closed state.
As shown in FIG. 3 and FIG. 4, the molding die 23 includes a female die 25 and a male die 27, and after the decorative film 1 is arranged on the molding surface that becomes the inner peripheral surface of the female die 25. As shown in FIG. 4, the mold is closed.

Here, before disposing the decorative film 1 in the molding die 23, the decorative film 1 is preformed by using another die not shown in the figure, thereby giving a three-dimensional shape in advance. It is also possible to supply to the molding die 23.
Further, when the decorative film 1 is disposed in the molding die 23, the decorative film 1 and the molding die 23 need to be aligned with the decorative film 1 inserted into the molding die 23. Become.

As a method of aligning the decorative film 1 and the molding die 23 in a state where the decorative film 1 is inserted into the molding die 23, the male die 27 has the alignment hole 29 of the female die 25. There is a method of inserting and holding the fixing pin 31.
Here, the alignment hole 29 is previously formed in the area | region which is not provided to the decorative molded product 13 which is a final product among the patterns currently formed in the decorative film 1 in the female type | mold 25. FIG.

The fixing pin 31 is formed in advance in an area where the male mold 27 is fitted with the alignment hole 29.
Further, as a method of aligning the decorative film 1 and the molding die 23 in a state where the decorative film 1 is inserted into the molding die 23, other than the method of inserting the fixing pin 31 into the alignment hole 29. Also, the following method can be used.

  In this method, for example, an alignment mark (not shown) formed in advance in an area that is not given to the final product in the pattern formed on the decorative film 1 is provided on the injection molding apparatus (not shown) side. This is a method in which the image is visually recognized by an image recognition device (not shown) and finely adjusted by driving the decorative film 1 on the conveying device (not shown) side. In this case, it is desirable to recognize the alignment mark at two or more diagonal points when viewed from the product portion of the injection molded product (decorative molded product 13).

In this case, at each alignment mark position, fine adjustment is performed by controlling the tension at the time of conveyance of the decorative film 1 by adjusting the vertical and horizontal positions according to the expansion and contraction of the image pattern, and by adjusting the vertical and horizontal directions. It is desirable to use a control method that equally divides the positions.
Then, the decorative film 1 and the molding die 23 are aligned, and after the molding die 23 is closed, the molten resin is injected into the molding die 23 into which the decorative film 1 is inserted. At this time, molten resin is inject | emitted to the contact bonding layer 9 side of the decorating film 1. FIG.

Note that the molding machine used in this embodiment is of a type that injects molten resin into the molding die 23.
Here, the temperature of the molten resin injected into the molding die 23 is set according to the physical properties of the resin used. For example, if the resin to be used is an acrylic resin, the temperature is in the range of 240 ° C. to 260 ° C., and if the resin to be used is an ABS resin, the temperature is 230 ° C.

In addition, the position of the injection port 33 (injection port) of the male mold 27 is set so that the decorative film 1 is not abnormally deformed by heat or gas generated when the molten resin is injected into the molding die 23. You may set according to the shape of the shaping | molding die 23 and the kind of molten resin.
After the molten resin injected into the molding die 23 into which the decorative film 1 is inserted is solidified, the molding die 23 is opened, and the molding die 23 is solidified as shown in FIGS. 5 and 6. The intermediate decorative molded product 15 made of the molten resin and the decorative film 1 is taken out. 5 is a diagram showing an example of the intermediate decorative molded product 15, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.

As shown in FIGS. 5 and 6, the intermediate decorative molded product 15 includes a burr (not shown) and a decorative material around a decorative portion 17 that finally becomes a product (decorated molded product 13). The dummy part 19 of the molded product 13 is integrated. Here, the dummy portion 19 has an insertion hole 21 formed by inserting the fixing pin 31 in the above-described alignment.
And by removing said burr | flash and dummy part 19 from the decoration part 17, the decoration molded product 13 as shown in FIG.7 and FIG.8 is manufactured. 7 is a view showing an example of the decorative molded product 13, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

(Modification)
In 1st embodiment mentioned above, although the structure of the decoration film 1 demonstrated the structure laminated | stacked in order of the glitter layer 4 and the pattern layer 5 on the base film 3, the structure of the decoration film 1 is here. Without being limited thereto, as shown in FIG. 9, a pattern layer 5 and a glitter layer 4 may be laminated on the base film 3 in this order. In addition, FIG. 9 is sectional drawing which shows schematic structure of the decorating film 1 in the modification of 1st embodiment.
In this case, it is possible to widen the range of design expression by switching the arrangement of the glitter layer 4 and the pattern layer 5. In addition, when taking the structure shown in FIG. 9, what is closely_contact | adhered with the base film 3 is used as offset printing ink which forms the pattern layer 5. FIG.
Moreover, when the structure of the decoration film 1 is made into the structure laminated | stacked in order of the pattern layer 5 and the brightness layer 4 on the base film 3, the structure of the decoration molded product 13 is a structure as shown in FIG. It becomes. In addition, FIG. 10 is sectional drawing which shows schematic structure of the decorative molded product 13 in the modification of 1st embodiment.

(Example)
Hereinafter, with reference to FIG. 1 to FIG. 10, a result of manufacturing the decorative film 1 and the decorative molded product 13 of the first embodiment and verifying the physical properties of the manufactured decorative molded product 13 will be described.

When the decorative film 1 is manufactured, a 125 μm-thick polyethylene terephthalate film (“Cosmo Shine A4300” manufactured by Toyobo Co., Ltd.) is used as the base film 3, and the base film 3 supplied by a roll is cut. To form a single wafer (a quadrilateral with a certain size).
And the bright layer 4 was provided with respect to the obtained sheet-like base film 3 by silk screen printing.

Here, 10% of “Microglass Metashine Titania Coat” manufactured by Nippon Sheet Glass Co., Ltd., which is a pearl pigment made of fine glass powder, is used for silk screen printing provided with the glitter layer 4 with respect to “IPX-000 medium” manufactured by Teikoku Ink. Pearl ink made by mixing at a ratio of
Further, the thickness of the emulsion layer 4 was set to 30 μm, and silk screen printing was performed using a silk screen plate having a mesh number of 100 lines / inch, so that the thickness of the entire glittering layer 4 was set to 15 μm.

Next, using a sheet-fed offset printing machine (with a UV drying unit), four-color printing with indigo, red, yellow, and black was performed to form the pattern layer 5.
At this time, in order to obtain adhesion to the base film 3, UV drying ink (“FD O New HW-PT” manufactured by Toyo Ink Co., Ltd.) mainly composed of a polyester resin was used. In addition, taking advantage of the fact that sheet-fed offset printing does not take time to change plates, several types of printing plates were prepared and printed.

After performing the above UV offset printing, the masking layer 7 was provided by silk screen printing.
Silk screen printing for providing the hiding layer 7 uses a two-component thermosetting white ink (“IPX-675 white” manufactured by Teikoku Ink Co., Ltd.) mainly composed of a polyester resin, and the emulsion thickness is 30 μm. By using a silk screen plate having a mesh number of 100 lines / inch and performing two silk screen printings, the thickness of the entire hiding layer 7 was set to 30 μm.

Subsequently, the adhesive layer 9 was provided by silk screen printing.
Here, an adhesive mainly composed of vinyl chloride / vinyl acetate copolymer and acrylic resin (“IMB-003” manufactured by Teikoku Inc.) is used as an adhesive for silk screen printing for providing the adhesive layer 9. The thickness of the adhesive layer 9 was 4 μm.
The decorative film 1 formed by the above steps was fixed in the molding die 23.

Here, before fixing the decorative film 1 in the molding die 23, the alignment hole 29 was provided in the edge part of the decorative film 1 (position which becomes the dummy part 19 after shaping | molding). Then, the alignment hole 29 and the fixing pin 31 of the molding die 23 were aligned to perform the above alignment.
In addition, before injecting molten resin, the preform of the decorative film 1 was performed in the molding die 23.

The mold is closed in a state where the decorative film 1 subjected to the above preform is fixed to the molding die 23, and the temperature is 240 ° C. and the injection speed is 100 mm / second on the adhesive layer 9 side of the decorative film 1. The molten acrylic resin (“Acrypet” manufactured by Mitsubishi Rayon Co., Ltd.) was injected.
Next, trimming the burrs remaining in the periphery of the intermediate decorative molded product 15 obtained by solidifying the injected molten resin, and further cutting and removing the dummy portion 19 to finish deburring. A decorative molded product 13 was obtained.

  And, with the decorative molded product 13 manufactured as described above and the manufacturing method of the decorative molded product 13, it is possible to obtain a decorative film having both fine gradation by offset printing and glitter. It was verified that there was.

By using the decorative molded product of the present invention and the manufacturing method thereof, it is possible to manufacture a plastic molded product having both a high-definition gradation design and a brilliant feeling under the condition of a small number of patterns and a short delivery time. It becomes possible.
Such a decorative molded product and its manufacturing method can be applied to surface decorations for plastic molded products such as cosmetic containers and toys in addition to plastic casings that form electronic devices such as mobile phones and personal computers. is there.

DESCRIPTION OF SYMBOLS 1 Decorating film 3 Base film 4 Bright layer 5 Pattern layer 7 Concealing layer 9 Adhesive layer 11 Molding resin 13 Decorated molded product 15 Intermediate decorated molded product 17 Decorated portion 19 Dummy portion 21 Insertion hole 23 Molding die 25 Female Type 27 Male type 29 Alignment hole 31 Fixing pin 33 Inlet

Claims (4)

On the surface of the base film, a decorative layer formed by laminating in order of a glitter layer, a pattern layer, a concealing layer, or in order of the pattern layer, the glitter layer, and the concealing layer,
The base film is formed of a polyethylene terephthalate film or an acrylic film,
The glitter layer and the concealing layer are laminated by silk screen printing,
The pattern layer is laminated by UV offset printing ,
The thickness of the hiding layer, decorative film, characterized in der Rukoto the range of 20μm or 50μm or less. The bright layer is made of mica or fine glass powder with titanium oxide applied to a transparent ink formed from a mixture of at least a vinyl chloride / vinyl acetate copolymer and an acrylic resin, or a mixture of at least a polyester resin. Produced by a mixture containing a pearl pigment produced by multilayer coating in a mass ratio of 30% or less,
The pattern layer is produced by a mixture of at least a pigment and an ultraviolet curable resin,
The hiding layer, according to claim 1, wherein at least a pigment, the mixture was mixed vinyl chloride-vinyl acetate copolymer and an acrylic resin, or the Tei Rukoto generated with a mixture obtained by mixing at least a pigment and a polyester resin Decorative film. An adhesive layer laminated on the surface of the concealing layer;
The adhesive layer includes at least one of vinyl chloride / vinyl acetate copolymer, acrylic resin, polyester resin, and urethane resin,
The thickness of the said contact bonding layer exists in the range of 3 micrometers or more and 10 micrometers or less, The decorating film described in Claim 1 or Claim 2 characterized by the above-mentioned. A decorative molded product comprising the decorative film according to claim 3 and a molded resin laminated on the surface of the adhesive layer,
The decorative molded product, wherein the decorative film and the molding resin are fixed by insert molding or vacuum molding.

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