JPH0618746B2 - Method for manufacturing molded article having partially vapor-deposited hologram - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a molded product having a partially vapor-deposited hologram, and more specifically, an electrical product (portable cassette tape recorder, compact disc storage case, And a cosmetics container (compact case, cap, etc.) and the like for producing a partial hologram image.

[Conventional technology]

In the past, holograms have been used in the fields of display-related products and advertisements for the purpose of eye-catcher effect and unexpected effect due to three-dimensional effect, and they are also used as books, magazine covers, illustrations, and as gifts and novelties. ing.

As a method of duplicating this hologram, two methods are roughly known.

The first method is contact exposure and interferometry. Each of these methods is a method of newly forming a hologram using a photosensitive material.

The second method is a method of producing a surface relief type hologram by embossing on a smooth plastic material. Since this is a mechanical pressing method, it is relatively cheap in terms of cost, and mass production is possible. Suitable for As the plastic sheet of the material used in this method, conventionally, a thermoplastic sheet such as a rigid polyvinyl chloride sheet is used.

[Problems to be solved by the invention]

However, in the first method, an expensive photosensitive material is always required, and its cost is a large proportion of the hologram price. Therefore, the duplicated hologram is inevitably expensive and the time required for manufacturing is high. However, since the processing time of the light-sensitive material is relatively long, it becomes long and the productivity is poor.

In the second method, a commercially available hard polyvinyl chloride sheet used as a material is
Since it is manufactured by the extrusion method, the surface property is not always good, and in many cases, it is not satisfactory in terms of smoothness and uniformity. That is, when the smoothness of the surface of the base material is poor, there is a problem that a fine concavo-convex pattern of about 700 to 1,500 holograms / mm cannot be uniformly embossed with good reproducibility. Furthermore, in this method, heat and pressure are applied from the surface to the plate-shaped or sheet-shaped resin to reproduce the uneven pattern of the stamper plate, so that the thick-walled molded product has a phenomenon of sink mark and warp. It was unavoidable and was considered unsuitable. Further, in order to duplicate a hologram image on a molded product, there is only a method of pasting a duplicate hologram on a sheet-shaped product, which does not have a sense of unity with the molded product and a satisfactory effect cannot be obtained. Therefore, the conventional technique has a problem that the usable range of the hologram is relatively limited.

[Means for solving problems]

The present invention has been made in order to solve the above problems, in a mold for injection molding, a hologram image forming stamper plate is fixed and placed so as to be planar with respect to the inner surface of the mold, Injection-molded to form irregularities of a hologram image on a molded product, and an easily peelable resin layer having no adhesiveness with the molded product is formed on a portion of the irregularity-formed surface side where light reflection is unnecessary, and is formed thereon. After forming the light reflection layer by vapor deposition, the easily peelable resin layer and the light reflection layer on the resin layer are peeled and removed, and a protective layer is further provided if necessary. It is a method of manufacturing a product.

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view conceptually showing the structure of an injection hologram according to the present invention, and FIGS. 2 to 6 are sectional views showing the method according to the present invention step by step.

According to the present invention, a hologram image forming stamper plate is fixed and placed in a mold for injection molding so as to be planar with respect to the inner surface of the mold, and a molten synthetic resin is filled in the mold by an injection molding method. Then, it is cooled and solidified to obtain a synthetic resin molded product (1). Here, to make the stamper plate planar with respect to the inner surface of the mold,
The stamper plate has a certain thickness, and it is for preventing the molded product from being dented by this thickness during injection molding. Specifically, the stamper plate and the inner surface of the mold are nested. Alternatively, the inner surface of the mold corresponding to the hologram image forming surface side may be entirely stamped. The molded product (1) has a hologram image existing on the stamper plate surface in the mold, that is, a fine concavo-convex pattern of 1 to 2 μ on the surface. (FIG. 2) As the synthetic resin, a transparent resin or an opaque resin can be used. When the transparent resin is used, the hologram image can be observed from the opposite side of the hologram image forming surface. Since the hologram image is observed through a transparent and thick resin layer, the original 3
Since the three-dimensional image is further passed through the layer having a different refractive index, it is possible to give the image a solid feeling. Examples of the transparent resin that can be used include polycarbonate, transparent polystyrene resin (hereinafter abbreviated as GPPS), acrylonitrile styrene copolymer resin (hereinafter abbreviated as AS), polyester resin, polymethylmethacrylate resin (hereinafter PMM).
A), cellulose-modified resins (cellulose propionate, etc.), and the like. Examples of opaque resins include acrylonitrile-butadiene-styrene copolymer resins (hereinafter referred to as A).
Abbreviated as BS resin), impact-resistant styrene resin (hereinafter HI
(Abbreviated as PS) or the like can be used. By selecting the injection molding conditions for these resins, the surface irregularity of the stamper plate can be reproducibly obtained on the molded product. The hologram image forming surface (2) side of the molded product is easily peeled off without adhesion to the molded product (1) by applying a printing method such as silk screen printing or a mask material and spray coating. The resin layer (3) is partially provided. (FIG. 3) The easily peelable resin layer (3) may be applied only to a portion that does not require light reflection, and usable resins include an acetalization product of polyvinyl alcohol represented by polyvinyl butyral and polyvinylidene chloride. And styrene, its copolymer with methyl methacrylate, a cellulose derivative or the like alone or in a mixture, and further, a low molecular weight plasticizer or the like may be added to improve the continuous peelability of the easily peelable resin layer (3). . Further, the diluent is preferably a mixture of water or alcohol so as not to affect the molded product. Further, in this step, it is possible to print characters, pictures, etc. in advance by a printing method such as silk screen or offset using a normal ink containing a coloring pigment. Then, after sufficiently drying, a light reflection layer (4) for light reflection is provided by vapor deposition. (4th
(Fig.) As the light reflection layer (4), commonly used metal materials such as aluminum, nickel, chrome, copper, titanium nitride, and zinc sulfide can be used, and required durability and corrosion resistance can be used. , Or depending on the hue required,
Just choose the type of metal. Other metal compounds such as metal oxides and metal sulfides can also be used depending on the required light reflection characteristics. As a vapor deposition method, a vacuum vapor deposition method, an ion plating method, or a sputtering method when an alloy such as titanium nitride is vapor deposited. In this case, the thickness of the light reflection layer (4) is 500 to
It may be 1000 (angstrom). When the portion provided with the easily peelable resin layer (3) is peeled off and removed using a material such as cellophane coated with an adhesive, the light is removed only to the portion not provided with the easily peelable resin layer (3). Reflective layer (4)
Is left, and a molded article having a partially vapor-deposited hologram as shown in FIG. 5 is obtained. If necessary, a protective layer (5) may be provided on the hologram image forming surface (2) as shown in FIG.
And the light reflection layer (4) is entirely or partially provided so as to cover the entire surface.

The molded product having the partially vapor-deposited hologram obtained as described above has a fine hologram pattern of 1300 to 1500 lines / mm, and can be provided with a light reflection layer only in a portion where light reflection is necessary. It was possible to obtain a one-point hologram image, and to obtain a hologram image integrated with the molded product without deteriorating the original transparency or coloring effect of the molded product.

〔Example〕

 Next, the present invention will be described in detail based on examples.

(Example 1) A stamper plate on which a hologram image was formed was fixed and placed flat on the inner surface of a mold in an injection molding mold as a tape loading portion cover of a portable cassette tape recorder. Polycarbonate resin was injection-molded at a resin temperature of about 300 ° C. using the injection-molding die to obtain a transparent injection-molded product having irregularities of a hologram image. In addition to the portion having the hologram image on the hologram forming surface side of the injection-molded product, an easily peelable resin solution having the following composition is diluted with a diluent such as alcohol and printed by a silk screen printing method, if necessary. After providing the easily peelable resin layer, it was sufficiently dried.

<Composition> Polyvinylidene chloride emulsion (NVT 50%) 85 parts by weight Plasticizer 5 parts by weight Emulsifier 3 parts by weight Methanol 7 parts by weight After vapor-depositing aluminum to a thickness of 600 (angstrom), an easily peelable resin layer, Further, aluminum on the resin layer was peeled off and removed using an adhesive tape to partially form aluminum. Furthermore, on top of that, a two-component curable protective layer mainly composed of acrylic polyol (transparent)
Was applied to the entire surface to obtain a molded product having a partial vapor deposition hologram.

(Example 2) The hologram image forming stamper plate was fixed and placed on the inner surface of the mold so as to be flat in the mold for injection molding shown in Example 1, and the PMMA resin was placed in the mold. Was injection-molded to obtain an injection-molded product (6) having a hologram image unevenness. On the hologram image forming surface (7) side of the injection molded product (6), P
Providing a printing layer (8) for letters, patterns, etc. using ordinary silk screen ink that adheres well to MMA, and then
A portion other than the hologram image forming surface (7), its outer peripheral surface (9), and the character pattern (10) was silk screen printed using the easily peelable resin solution shown in Example 1. After being sufficiently dried, aluminum is vapor-deposited from the easily peelable resin solution surface side, and then the portion printed with the easily peelable resin solution and aluminum on this are peeled and removed using an adhesive tape, An injection-molded article having a partially vapor-deposited hologram as shown in FIG. 7 was obtained. Further, the entire surface having the hologram as a protective layer was resin-coated. Since the obtained molded product is a transparent material, the inside can be seen through, and the hologram image forming surface (7) and its outer peripheral surface (9), letters,
The appearance was excellent with a printed layer (8) such as a picture and also a character pattern (10) made of vapor-deposited aluminum.

〔The invention's effect〕

The partially vapor-deposited hologram molded product obtained by the method according to the present invention can be provided with a light-reflecting layer only in a portion where light reflection is necessary, so that a one-point hologram image can be obtained, and the transparency of the molded product is essentially It is a molded product with a hologram image that does not deteriorate the coloring effect, has a sense of unity with the molded product, and has an appearance with a profound feeling. Also, three-dimensional molded products that were impossible with the conventional embossing method,
It is possible to expose a partial hologram image on a thick molded product, and the field of use of the hologram dramatically expands, and it can be used in the field of all synthetic resin molded products, and it is an industrially extremely effective invention.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a sectional view of a molded article according to the present invention, FIGS. 2 to 6 are sectional views for explaining a manufacturing process, and FIG. 7 is an embodiment. FIG. 3 is a conceptual view of the molded product observed from the front side with the hologram image printed surface as the back side. (1) …… Synthetic resin molded product (2) …… Hologram image forming surface (3) …… Releasable resin layer (4) …… Light reflecting layer (5) …… Protective layer (6) …… Injection molding Item (7) …… Hologram image forming surface (8) …… Printing layer (9) …… Outer peripheral surface (10) …… Character pattern

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Claims (1)

[Claims] Claims: 1. A hologram image forming stamper plate is fixed and placed in a mold for injection molding so as to be planar with respect to the inner surface of the mold, and injection molding is performed to make the hologram image uneven on a molded product. Is formed, and an easily peelable resin layer having no adhesiveness with the molded product is formed on a portion of the unevenness forming surface side where light reflection is unnecessary, and a light reflecting layer is provided thereon by vapor deposition, followed by easy peeling. A method for producing a molded article having a partially vapor-deposited hologram, which comprises peeling and removing a transparent resin layer and a light-reflecting layer on the resin layer, and further providing a protective layer if necessary.