JPS62111276A - Molding having hologram and its production - Google Patents

Abstract

PURPOSE:To obtain a hologram image having the integral feel with a molding consisting of an opaque dark color resin of <=4 Munsell segment without a light reflective layer by integrally molding the ruggedness of a hologram on the surface of said molding. CONSTITUTION:The fine ruggedness of the hologram sized 1-2mu is integrally provided on the surface of the molding 1 consisting of the opaque dark color resin. A design layer 3 and protective layer 4 are successively provided on the hologram image 2 side of the molding 1. A stamper plate for forming the hologram image is fixed and imposed in a metallic mold for injection molding so as to be made flat with the inside surface of the mold and the opaque dark color resin is filled into the mold and is cooled and solidified by an injection molding method, by which the molding 1 is obtd. The molding 1 has the hologram image 2 existing on the surface of the stamper plate in the mold, i.e., the fine ruggedness sized 1-2mu on the surface. The design layer 3 is provided by a silk screen printing method on the hologram image 2 side on the molding 1 and further the protective layer 4 is provided on the surface corresponding to the hologram image 2 or the entire surface.

Description

[Detailed description of the invention] Is the invention a false hologram? This article relates to molded products with electrical products (cassette tape recorders,
It can also be used for cosmetic containers (compact cases, caps, etc.), decorative items (ornaments, pendants, etc.), etc.

<Conventional Technology> Holograms have traditionally been used in fields such as display-related fields and advertising to create an eye-catcher effect and an unexpected three-dimensional effect.

It is used as magazine covers, illustrations, gifts, and novelties.

There are two known methods for manufacturing this hologram.

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

The second method is to create a surface relief hologram by embossing a smooth plastic material.
From a mechanical point of view, this is relatively cheap.

It is also suitable for mass production. The plastic sheet of material used in this method is conventionally a thermoplastic sheet such as a rigid polyvinyl chloride sheet.

In either case, a light reflecting layer is always provided.

<Problems to be solved by the invention> However, in the first method, an expensive photosensitive material is always required, and the cost accounts for a large proportion of the price of the hologram. The hologram produced by the hologram is too expensive (41), and the time required for manufacturing it is long because the processing time for the sensitive material is relatively long, resulting in poor productivity.

In addition, in the second method, a commercially available hard plastic vinyl chloride sheet used as a material is calendered,
Because it is made by extrusion method.

Although it does not necessarily have good surface properties, it is 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 emboss a fine uneven pattern of about 700 to 1,500 holograms/parrot with good reproducibility. Furthermore, in this method, heat and pressure were applied to a plate or sheet of resin from one surface to reproduce the uneven pattern of the stamper plate.

Sink marks and glue phenomena are unavoidable for thick molded products.
was considered unsuitable. Further, in order to reproduce a hologram image on a molded product, there is only a method of pasting a hologram made of a sheet-like material Km, but with this method, there is no sense of unity with the molded product, and a satisfactory effect cannot be obtained.

Therefore, the scope of use of holograms in conventional techniques is relatively limited. And in these ways.

Since a process of forming a light reflective layer is required, there is a problem in that the cost is high.

<Means for Solving the Problems> The present invention has been made to solve the above problems, and includes integrally providing hologram irregularities on the surface of a molded product made of opaque dark resin with a Munsell classification of 4 or less. This is a molded product having a hologram, which is characterized in that a stamper plate for forming a hologram image on the inner surface of an injection mold is fixed and placed so as to be flat on the inner surface of the mold. The molded product is manufactured by injection molding an opaque dark-colored resin into the mold to form a hologram image on the molded product.

Next, the present invention will be explained in detail using the drawings.

As shown in FIG. 1, the molded product of the present invention has a molded product (1) made of opaque dark-colored resin, and the surface of the molded product (1) is integrally provided with fine hologram irregularities of 1 to 2 μm. 1
) Hologram 1 elephant (2) side has no pattern (3),
A protective layer (4) is then provided.

The opaque dark-colored resin includes acrylonitrile-butadiene-styrene copolymer RA resin (hereinafter abbreviated as ABS* fat) and impact-resistant styrene resin (hereinafter abbreviated as HIPS).
Use a coloring agent such as Me, which is colored to Munsell classification 4 or below, or a coloring agent that has been previously colored.

To manufacture the molded product of the present invention, first, a stamper plate for forming one hologram is fixed and installed in an injection mold so that it is flat against the inner surface of the mold, and then the stamper plate for forming one hologram is placed in the mold. A molded article (1) is obtained by filling, cooling, and solidifying an opaque dark-colored resin using a molding method.

The reason why the stamper plate is made flat with respect to 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, this is done by using a method such as making a stamp plate.

The molded product (1) has a hologram @(2) existing on the stand-bar plate surface in the mold, that is, a fine 1fa Tt unevenness of 1 to 2μ on the surface. (Fig. 2) A pattern layer (3) is provided on the hologram 1 (2) side of the molded product (1) by silk screen printing, (Fig. 3)
.

Furthermore, if necessary, apply a protective layer (4) to one hologram (2).
Provided on the corresponding surface or entire surface.

<Example> Next, the present invention will be explained in detail using examples.

A stamper plate having a hologram image formed thereon was fixed and placed in an injection mold for the main body of a patterned watch without a cover such as glass so as to be flat against the inner surface of the mold. In the injection mold, there is a Munsell section V=3 colored black.
The ABS resin is injection molded at a resin temperature of approximately 240°C, and the black molded product with the unevenness of the hologram image is made into a barrel.

Printing a pattern layer with silk screen ink on a portion of the hologram 1 image forming surface of the molded product other than the hologram iron,
On top of that, a two-component curing type protective layer mainly composed of acrylic polyol was applied over the entire surface, and a molded product with a partially visible hologram image could be obtained without a light-reflecting layer.

<Effects of the Invention> Since the molded product of the present invention uses an opaque dark-colored resin with a Munsell classification of 4 or less, a hologram image with a sense of unity with the molded product can be seen without a light-reflecting layer. In addition, a hologram image is formed on the surface of the molded product at the same time as injection molding, and since an opaque dark resin is used, light reflection 1- is not necessary, so the manufacturing process is simple and the cost is low.

[Brief explanation of drawings]

The drawings are for explaining the present invention; FIG. 1 is a cross-sectional view of a molded product according to the present invention, and FIGS. 2 to 4 are cross-sectional views explaining the manufacturing process. m... Molded product (3)... Pattern layer (4)... Protective layer

Claims (2)

[Claims] (1) A molded product having a hologram, characterized in that a molded product made of an opaque dark-colored resin with a Munsell classification of 4 or less is provided with hologram irregularities integrally on its surface. (2) A stamper plate for forming a hologram image on the inner surface of an injection mold is fixedly placed on the inner surface of the mold so as to be flat, and an opaque dark-colored resin is injected into the mold, and molding is performed. 1. A method for manufacturing a molded article having a hologram, the method comprising forming a hologram image on the article.