JPH0754270Y2 - Transfer sheet having light diffusion layer and decorative molded article - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a transfer sheet having a light diffusion layer, and includes a decorative molded product manufactured by using the transfer sheet.

[Prior art]

BACKGROUND ART Plastic molded products are widely used as operation panels for various home appliances and mechanical devices. Most of this kind of operation panel has a pilot lamp, so the molded product diffuses the light from the LED (light emitting diode) and miniature bulb placed inside, and at the same time diffuses it.
It must be possible to confirm the lighting of the lamp from a wide angle. In molded products such as panels with pilot lamps, you can see that the LEDs etc. are emitting light, so to speak, the entire surface except the part that becomes the window is painted with a transfer sheet, and then the light diffusion effect on the window part It is obtained by pasting a film with a stain or printing an ink having a known light diffusion effect. The optical performance of this window portion is required to have both high light transmittance and high transmitted light diffusion effect. Since the manufacturing method of attaching and printing the film after the above-mentioned transfer is troublesome, it is desirable to perform painting in one transfer step and impart light diffusivity to a desired portion. As a transfer sheet that realizes that, matting of a predetermined portion of a transfer mount with a releasable matte ink or printing of so-called matte ink in which particles for scattering light are added to a predetermined portion of a printing layer is performed. Attempts were made to use one. However, in the former case, if the unevenness formed by the matte treatment is increased, it becomes difficult to separate the transfer mount and the printing layer, and since the light diffusion on the surface of the transfer layer is used, the light transmittance is set to a sufficient value. Is reduced, and both are incompatible. The latter has a problem that when a large amount of matte material is filled in the ink, the light transmittance is lowered, it is difficult to achieve compatibility with light diffusibility, and printability is deteriorated. As a further fatal drawback, the existing ink containing a matting agent is resistant to transmitted light when the adhesive layer or transparent surface layer is overprinted on it, or when the surface becomes smooth by applying heat or pressure during transfer. It was found that the light diffusivity was significantly reduced. For this reason, it has not been possible to obtain a molded article with sufficient light transmittance and diffusion effect by one-time transfer.

[Problems to be solved by the device]

An object of the present invention is to provide a transfer sheet having a light diffusion layer capable of imparting sufficient light transmittance and light diffusivity to a desired portion. It is also included in the object of the present invention to provide a molded product which is painted by using the transfer sheet, especially an equipment operation panel having a pilot lamp.

[Means for Solving the Problems]

As shown in FIG. 1, the transfer sheet having the light diffusion layer of the present invention is easily peeled off from the transfer mount (1) having a fine uneven portion (11) having a predetermined pattern on the surface thereof after peeling. Comprises a transparent surface layer (2) for protecting the colored ink layer, a colored ink layer (3) and a transparent adhesive layer (4) in that order, the colored ink layer covering the portion corresponding to the fine irregularities of the transfer mount. It is a transparent matte ink (31) and the other parts are printed with gloss ink (32). The transfer mount is a commonly used plastic film, for example,
Polyester such as polyethylene terephthalate and polybutylene terephthalate, polyolefin, polyamide,
A film such as a film of polyimide or polysulfone, or a paper such as high-quality paper or parchment paper on which the plastic layer is formed may be used. A polyethylene terephthalate film is preferable in terms of price and heat resistance. It is preferable to apply an epoxy resin, a melamine resin or a urethane resin to these films to improve the releasability. The film thickness is generally 6-20
It is 0 μ, preferably 12 to 75 μ. When forming fine irregularities in a predetermined pattern on the surface of the transfer mount, the light diffusivity of the transparent matte ink layer itself, which will be described later, is insufficient due to the limitation on the amount of matting agent added. Select a shape and surface roughness that is sufficient to supplement with. There are several known methods of forming, and these may be followed. For example, a pattern is printed on the smooth surface of the film as described above with a transparent surface layer and a matte ink having releasability, or the film is blasted or embossed to make it uneven. Therefore, the predetermined pattern is left, and the other portions are printed with normal ink to make it smooth.
Alternatively, there is a method of embossing unevenness on the film in a pattern using an embossing plate. The surface layer is provided by applying a synthetic resin having the required surface physical properties, which is easily peeled off from the transfer mount. For example, an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a chlorinated polyolefin, a chlorinated rubber, a cyclized rubber or a nitrocellulose which is dissolved in an appropriate solvent is used in an amount of 0.2 to 5
It is applied to a thickness of .mu., preferably 0.5 to 2 .mu. (when dried). The colored ink layer is composed of matte ink and gloss ink. The matte ink is an ink which is transparent and has a diffusivity for transmitted light, for example, a matte material such as alumina, calcium carbonate, barium sulfate, magnesium carbonate, glass beads or the like dispersed in a vehicle. It may be a dispersion of beads of a resin that has a refractive index different from that of the ink vehicle and is incompatible with it. As an example of such a combination, in the case of a vinyl chloride-vinyl acetate copolymer or an acrylic resin as a vehicle, beads of Teflon or polyvinylidene fluoride are used, and when the vehicle is polyethylene, in addition to those mentioned above, polyethylene is added. , Beads such as polypropylene are used as a mat material. The average particle diameter of the mat material is preferably 3 to 8 μm, and if it is less than the lower limit, the light diffusion property is low, and if it exceeds the upper limit, the light transmittance and printability are deteriorated. The amount of addition of the matting material is preferably 50% by weight or more from the viewpoint of light diffusivity, but on the other hand, the amount of addition is 1 because the printability decreases due to an increase in ink viscosity and the coating becomes brittle. ~ 50
Select from the range of weight% and make up for the lack of light diffusivity by fine irregularities formed from the transfer mount. In either case, a dye may be added if necessary in order to color the light from the light source. Gloss ink is a name for matte ink and is a general printing ink that does not contain matte material. As the gloss ink, a transparent ink and a hiding ink are appropriately selected and used. For both the matte ink and the gloss ink, it is preferable to select a resin of the same type as that of the surface layer for the vehicle in order to obtain good adhesion between the surface layer and the colored layer. It goes without saying that the colored ink layer may be provided by using inks of two or more colors. The printing may be performed by a known method such as gravure printing or screen printing. The transparent adhesive is selected from an acrylic resin, a vinyl chloride-vinyl acetate copolymer, a rubber resin, an olefin resin, a styrene resin, or the like, which is appropriate depending on the material of the transferred material. It is better if the thickness of the adhesive layer is as thin as 0.1 to 10 μ, but it is necessary to ensure the adhesion.
0.5 to 2μ is preferable. The decorative molded article having a light diffusion layer of the present invention is a plastic molded article painted using the above-mentioned transfer sheet, and as shown in FIG. 5) A printing layer comprising an adhesive layer (4), a colored ink layer (3), and a surface layer (2) having fine irregularities of a predetermined pattern on the surface is transferred onto the colored layer. The surface of the surface layer is printed with matte ink (31) underneath the fine irregularities and the other area is printed with gloss ink (32). The transfer to the base material can be carried out by the same method as the conventional one such as using a heat roll, and it goes without saying that a painting injection molding method in which the transfer is performed simultaneously with the injection molding of the base material may be used. In the example shown in FIG. 2, the light source (6) is on the side of the base material,
It is an arrangement to see it from the side of the surface layer, but on the contrary,
There may be an arrangement in which the light source is on the surface layer side and the light source is viewed from the substrate side.

[Action]

The transfer sheet of the present invention has a predetermined pattern formed on the surface of the transfer mount by providing unevenness on the surface layer, and by forming a part of the colored ink layer with matte ink, a desired portion is formed. Realized high light diffusion. That is, the light diffusivity, which was not sufficient only by providing the surface layer with fine irregularities or by providing the matte ink layer, was made sufficient by using both means. Since the decorative molded article of the present invention is provided with the above-mentioned layer having high light diffusivity in the portion through which the light from the light source passes,
Diffuses light from LED etc. well.

【Example】

38 μm thick polyethylene terephthalate film “S type” (manufactured by Diafoil) is coated with a 1.5 μm thick melamine resin “EX114D” (Dainichi Seika Kogyo) on one side,
Furthermore, matte ink "mat coat + mat hardener"
(Manufactured by Showa Ink Kogyo Co., Ltd.) was pattern-printed by a gravure method to prepare a transfer mount having fine irregularities of a predetermined pattern. A transparent paint "Hakurinis 46-7" (same) as an acrylic resin was gravure-coated on the above-mentioned transfer mount so as to have a thickness of 1 µm. On top of that, in a portion corresponding to the portion where the matte ink was printed, as a matte ink, a vehicle made of a mixture of vinyl chloride-vinyl acetate copolymer and acrylic resin was added with 50% by weight of calcium carbonate having an average particle diameter of 5 μm. The dispersed ink was used as a gloss ink on the other parts, and the same vehicle as the matte ink, to which carbon black had been added instead of calcium carbonate, was gravure printed, and then the adhesive "HS32G" (same) The transfer sheet of the present invention was obtained by gravure coating to a thickness. The above transfer sheet was placed in a molding die, and transparent AS resin was injection-molded. The molded product was released from the mold and the transfer mount was peeled off to obtain the decorative molded product of the present invention.

[Effect of device]

The transfer sheet of the present invention can transfer the printed layer,
At the same time as painting the molded product, it is possible to provide a portion requiring high light diffusion such as a window portion of a pilot lamp. Unlike the conventional transfer sheet, even if the matte ink layer is smoothed by the overprinting of the adhesive layer or the heat and pressure applied at the time of transfer, the diffusibility of transmitted light does not decrease. The decorative molded product of the present invention obtained by using the above transfer sheet has a part exhibiting high light transmittance and high light diffusion property, and as an operation panel, it is easy to check the pilot lamp from a wide angle. Can be done.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view for explaining the structure of the transfer sheet of the present invention. FIG. 2 is a typical example of the decorative molded product of the present invention.
FIG. 3 is a view similar to FIG. 1 for explaining an operation panel having a pilot lamp window. DESCRIPTION OF SYMBOLS 1 ... Transfer mount 11 ... Fine irregularities 2 ... Surface layer 3 ... Colored ink layer 31 ... Matt ink, 32 ... Gloss ink 4 ... Adhesive layer 5 ... Substrate

Claims (3)

[Scope of utility model registration request] 1. A fine concavo-convex portion (11) having a predetermined pattern on the surface.
A transparent surface layer (2) which is easily peeled off from the transfer mount and protects the colored ink layer after peeling,
A matte ink comprising a colored ink layer (3) and a transparent adhesive layer (4) provided in this order, and the colored ink layer is transparent and has a diffusibility for transmitted light at a portion corresponding to the fine irregularities of the transfer mount. (31) A transfer sheet having a light diffusing layer which is obtained by printing the other portion with gloss ink (32). 2. The transfer sheet according to claim 1, wherein the fine concavo-convex portion of the transfer mount is formed by printing matte ink on a smooth film in a predetermined pattern. 3. A transparent adhesive layer (4), a colored ink layer (3), and a transparent surface layer having fine irregularities of a predetermined pattern on the surface of a substrate (5) which is a plastic molded product. The colored ink layer is formed by transferring a printing layer consisting of 2), and a portion of the colored ink layer below the fine irregularities of the surface layer is formed of a matte ink (31) which is transparent and has a diffusibility with respect to transmitted light. A decorative molded product having a light diffusion layer whose part is printed with gloss ink (32).