JPS6280029A - Molded piece having partly deposited hologram - Google Patents

Abstract

PURPOSE:To obtain a hologram image integrated with a molded piece, by forming an uneven hologram on the molded piece, and a water-soluble resin layer at the part of the uneven surface side where light reflection is unnecessary, and after a light-reflecting layer is provided on it by deposition, by removing the water-soluble resin layer and the light reflective layer on the water-soluble resin layer by washing with water. CONSTITUTION:By spray-coating after providing printing such as silk screen printing method or masking member to the hologram image forming surface side of a molded piece, a water-soluble resin layer 3 is partly provided. After drying sufficiently a light-reflecting layer 4 for reflecting light is provided by deposition. As this light-reflecting layer 4 a metallic material is used. This molded piece with the light-reflecting layer 4 deposited is dipped into a water bath, and the light-reflecting layer 4' is removed in the part provided with the water-soluble resin layer 3, when the molded piece having partly deposited hologram is obtained. Furthermore, if necessary, its whole surface is covered with a protective layer 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a molded product having a partially vapor-deposited hologram. The present invention relates to a manufacturing method for producing a partial hologram image on a cosmetic container (compact case, cap, etc.), nameplate, etc.

[Conventional technology]

Traditionally, holograms have been used in display-related and advertising fields for eye-catcher effects and unexpected three-dimensional effects, and are also used as covers and illustrations for books and magazines, as gifts, and as novelties. It is being

There are two known methods for replicating this hologram.

The first method is contact exposure and interferometry. All of these methods are methods for creating new holograms using photosensitive materials.

The second method is to create a surface relief type hologram by embossing a smooth plastic material.This method is a mechanical pressing method, so it is relatively cheap in terms of cost, and it can be mass produced. suitable for The plastic sheet used in this method is conventionally a thermoplastic sheet such as a rigid polyvinyl chloride sheet.

[Problem that the invention seeks to solve]

However, the first method necessarily requires expensive photosensitive materials, and the cost accounts for a large proportion of the price of the hologram, so the replicated hologram must be expensive, and the manufacturing time is The processing time for the photosensitive material is relatively long, so the processing time is long and the productivity is poor.

In addition, in the second method, a commercially available hard polyvinyl chloride sheet used as a material is used by a calendar method,
Since they are manufactured by extrusion, they do not necessarily have good surface properties, and are often unsatisfactory in terms of smoothness and uniformity. That is, if the smoothness of the surface of the base material is poor, there is a problem that it is not possible to uniformly embossing a fine uneven pattern of about 700 to 1500 holograms/Inm with good reproducibility. Furthermore, with this method, heat and pressure are applied to the plate or sheet resin from the surface to reproduce the uneven pattern of the stamper plate, so thick molded products are prone to sink marks and spots. The phenomenon was unavoidable and considered inappropriate. In addition, the only way to replicate a hologram image on a molded product is to paste the replicated hologram onto a sheet-like object, which lacks a sense of unity with the molded product.
A satisfactory effect cannot be obtained. Therefore, in the conventional technology, the range of use of holograms is relatively limited.

[Means for solving problems]

The present invention has been made to solve the above problems, and includes fixing and placing a stamper plate for forming a hologram image in a flat surface on the inner surface of the mold in an injection mold.
Injection molding is performed to form hologram image irregularities on the molded product,
A water-soluble resin layer is formed on the part of the uneven surface where light reflection is not required, and a light-reflecting zone is provided on the layer by vapor deposition.The water-soluble resin layer and the light on the water-soluble resin layer are washed with water. This is a method for producing a molded article having a partially vapor-deposited hologram, which is characterized by removing the anti-reflection layer and further providing a protective layer if necessary.

Next, the present invention will be explained in detail using 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
1 is a cross-sectional view showing each step of the method according to the present invention.

In the present invention, a stamper plate for forming a hologram image is fixed and placed in an injection mold so as to be flat against the inner surface of the mold, and a molten synthetic resin is filled into the mold by an injection molding method. , cool and solidify to obtain a synthetic resin molded product (1). The reason why the stamper plate is made flat against the inner surface of the mold is to prevent the molded product from being dented by this thickness during injection molding because the stamper plate has a certain thickness. Specifically, the stamper plate and the inner surface of the mold are nested, or the entire inner surface of the mold corresponding to the hologram image forming surface is made into the stamper plate. The molded product (1) has a hologram image existing on the stamper plate surface in the mold, that is, a fine uneven pattern of 1 to 2 μm on its surface. (Fig. 2) As the synthetic resin, transparent resin or opaque resin can be used. If transparent resin is used, the hologram image can be observed from the opposite side of the hologram image formation surface, In this case, the hologram image is observed through a transparent and thick resin layer, so the original 3
Since the dimensional image is further interposed with a layer having a different refractive index, it is possible to give the image a sense of solidity. Transparent resins that can be used include polycarbonate, transparent polystyrene resin (hereinafter referred to as GPPS), acrylonitrile-styrene copolymer resin (hereinafter referred to as As), polyester resin, and polymethyl methacrylate resin (hereinafter referred to as PMMA).
Acrylonitrile-butadiene-styrene copolymer resin (abbreviated as AB), cellulose modified resin (cellulose propionate, etc.), etc.
(abbreviated as S resin), impact-resistant styrene resin (hereinafter referred to as
PS) etc. can be used. With these resins, by selecting the injection molding conditions, it is possible to obtain a stamper-produced surface unevenness on a molded product with good reproducibility. The water-soluble resin layer (3) is partially applied to the hologram image forming surface (2) of the molded product by a printing method such as silk screen printing, or by spray painting after applying a mask material. establish. (Figure 3) This water-soluble resin layer (3) only needs to be applied to areas that do not require light reflection, and resins that can be used include partially saponified or fully saponified polyvinyl alcohol resin, methyl cellulose resin, ethyl cell [ 1-s resin etc. can be used. Further, it is desirable to add inorganic pigments such as barium sulfate, titanium oxide, calcium carbonate, etc. to the resin in order to improve washability in the post-process washing with water.

As the solvent for dissolving the resin, a composition mainly composed of water is desirable in order not to adversely affect the molded product, but an alcoholic solvent may be added in consideration of suitability for printing on the printing material. In addition, in this step, it is also possible to print letters, patterns, etc. in advance using a printing method such as silk screen or offset printing using ordinary ink containing colored pigments.

After sufficient drying, a light reflecting layer (4) for light reflection is provided by vapor deposition. (Figure 4) This light reflecting layer (4
) include aluminum, nickel, chrome, copper,
Commonly used metal materials such as titanium nitride and zinc sulfide can be used to provide the required durability, corrosion resistance, and
You can choose the type of metal depending on the hue required. Other metal compounds such as metal oxides and metal sulfides can also be used depending on the required light reflection properties. As a method for vapor deposition, a vacuum vapor deposition method, an ion blating method, or a sputtering method is used when an alloy such as titanium nitride is vapor deposited. The molded product on which the light-reflecting layer (4) was vapor-deposited was crushed in a water bath, and the light-reflecting layer (4) in the area covered with the water-soluble resin layer (3) was removed, resulting in a molded product as shown in Figure 5. A molded article having a partially deposited hologram is obtained.Furthermore, if necessary, as shown in FIG. will be provided partially.

A molded product having a partially deposited hologram that is IHed as described above can have a fine hologram pattern of 1,300 to 1,500 lines/mm, and it is also possible to apply a light-reflecting layer only to the areas where light reflection is necessary. Therefore, a one-point hologram image could be obtained, and a hologram image integrated with the molded product could be obtained without reducing the original transparency or coloring effect of the molded product.

〔Example〕

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

(Example 1) A stamper plate on which a hologram image was formed was fixed and placed in an injection mold as a tape loading part cover of a portable cassette tape recorder so as to be flat on the inner surface of the mold. Using the injection mold, a polycarbonate resin was injection molded at a resin temperature of about 300° C. to obtain a transparent index molded product having a hologram image irregularity. A water-soluble resin solution consisting of the following composition is diluted with a diluting solvent as necessary and printed on a portion of the injection molded product other than the hologram image on the hologram forming surface side using a silk screen printing method. After providing the resin layer, it was dried at 80° C. for 10 minutes.

<Composition> Polyvinyl alcohol resin 25 parts by weight Barium sulfate 50 parts Water
15 parts by weight isopropyl alcohol
After vapor-depositing 10 parts by weight of chromium on this, washing with water,
The water-soluble resin layer and the chrome on the water-soluble resin layer are washed off, and a two-component hardening type protective layer (transparent) mainly made of acrylic polyol is applied to the vapor deposited layer side, which has a partially vapor deposited hologram. A molded product was obtained.

(Example 2) A stamper plate for forming a hologram image was fixed and placed in the injection mold shown in Example 1 so as to be flat against the inner surface of the mold, and PMMA resin was placed in the mold. By injection molding, an injection molded product (6) having a hologram image unevenness was obtained.PM was added to the hologram image forming surface (7) side of the injection molded product (6).
A printing layer (8) for letters, patterns, etc. is provided using a regular silk screen ink that adheres well to the MA, and then the hologram image forming surface (7) and its outer circumferential surface (9), and areas other than the character pattern (10) are printed. The sections were silk screen printed using the water-soluble resin solution shown in Example 1. After sufficiently drying, aluminum was vapor-deposited from the side of the water-soluble resin solution, and then the area printed with the water-soluble resin solution and the aluminum above this were removed by washing with water, as shown in Figure 7. An injection molded article having such a partially deposited hologram was obtained.

Furthermore, the entire surface having the hologram was coated with resin as a protective layer. The obtained molded product is made of transparent material, so
The inside can be seen through, including the hologram image forming surface (7), its outer peripheral surface (9), a printed layer (8) for letters, pictures, etc., and a character pattern made of vapor-deposited aluminum (10).
It had a wonderful appearance.

(Effects of the Invention) In the partially vapor-deposited hologram molded product obtained by the method of the present invention, a light reflecting layer can be applied only to the areas where light reflection is required, so a one-point hologram image can be obtained, and the molded product It is a molded product with a hologram image that does not reduce the original transparency or coloring effect, has a sense of unity with the molded product, and has a dignified appearance.Also,
It is now possible to emboss a partial hologram image on three-dimensional molded products and thick molded products, which was impossible with conventional embossing methods.
The field of application of holograms has expanded dramatically, and it can be used in all kinds of synthetic resin molded products, making it an extremely effective invention in industry.

[Brief explanation of drawings]

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

Claims (1)

[Claims] 1) A stamper plate for forming a hologram image is fixed and placed in an injection mold so that it is flat against the inner surface of the mold, and injection molding is performed to form the unevenness of the hologram image on the molded product. , a water-soluble resin layer is formed on the part of the uneven surface where light reflection is not required, a light-reflecting layer is provided thereon by vapor deposition, and then the water-soluble resin layer and the light on the water-soluble resin layer are washed with water. A method for producing a molded article having a partially vapor-deposited hologram, the method comprising removing a reflective layer and further providing a protective layer if necessary.