JPH035301B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a plastic container with a shiny curved surface.

For example, in addition to the functionality of the container itself, one of the important elements desired for containers and caps for cosmetics, fragrances, etc. is superior decorativeness, that is, rich decorativeness. be.

Conventionally, methods for decorating caps and containers of this type include ordinary printing, decoration by multicolor molding, decoration by metallic print, and adding diffusely reflective substances such as pearlescent agents into transparent or colored transparent resin materials. Decorating methods are known in which colors and brightness shading are made to appear three-dimensionally by mixing, but all of these conventional decorating methods have advantages and disadvantages. For example, a decorating method that mixes a diffusely reflective substance into a resin material for making plastic molded products can give a certain degree of depth and three-dimensional effect, but it is inferior in glitter, and a decorating method that uses metallic prints Although it has excellent brilliance, it is difficult to produce a deep three-dimensional effect like that of a pearl.

The present invention has been made in consideration of the above points, and has excellent brightness, and furthermore, brightness, color shading, and boundaries between them appear more clearly, and a three-dimensional effect with sufficient depth can be obtained. Furthermore, it is an object of the present invention to provide a method for manufacturing a plastic container having a glittering curved surface which is also excellent in abrasion resistance and the like.

Hereinafter, the present invention will be explained based on an embodiment shown in the attached FIGS. 1 to 3.

The embodiment shown in the figure shows a container cap manufactured by applying the present invention.
has a spherical surface as shown in Figure 2,
A base material 1 made of AS or ABS resin as a whole, a decorative layer 2 applied to the surface of this base material 1,
The adhesive layer 2 is covered with a transparent protective layer 3.

The decorative layer 2 is formed on the base material 1 as shown in FIG.
a light-reflecting metal layer 2b provided on the surface of the acrylic resin via an adhesive layer 2a, and an adhesive layer 2 made of a colored transparent resin on this metal layer 2b.
a light refractive body 2d made of glass beads in the form of fine particles arranged in a layer through c;
d and a transparent resin layer 2e provided on top of the transparent resin layer 2e. Further, the light refractive body 2d is arranged on the boundary line between the adhesive layer 2c and the transparent resin layer 2e. That is, each of the spherical light refracting bodies 2d has a structure in which approximately the lower half thereof is immersed in the adhesive layer 2c, and the remaining upper half is covered with the transparent resin layer 2e. .

Here, the light refractive body 2d has transparency close to colorless, and has a refractive index of 1.50 to 2.20, preferably 1.50 to 2.20 so that its focal position is on the surface of the metal layer 2b.
A range of 1.90 to 1.99 is used. Further, the metal layer 2b is formed of an aluminum vapor-deposited film or the like having high reflection efficiency, and the adhesive layer 2c thereon is made of acrylic, urethane, alkyd resin, or a copolymer thereof, which impairs the light transmittance. It is made of a colored transparent resin mixed with an appropriate amount of dyes and pigments to the extent that it does not. Further, the transparent resin layer 2e thereon is formed of an acrylic ultraviolet curable resin or the like. In the figure, reference numeral 4 indicates a female thread that is screwed into a male thread on the outer periphery of the opening of the container body B, and 5 indicates a packing.

Next, an example of a method for manufacturing a cap having the above structure will be described. First, a base material 1 with a smooth spherical surface is formed by means such as injection molding,
Next, on the surface of this base material 1, a resin adhesive having adhesive properties to both the base material 1 and metal, such as acrylic resin as a main component, is applied to form an adhesive layer 2a. Aluminum is vapor-deposited to form a metal layer 2b with high light reflectivity. Then, an adhesive layer 2c is formed on the metal layer 2b, and a light refracting body 2d made of glass beads is uniformly sprinkled on the adhesive layer 2c, and then the adhesive layer 2c is hardened at room temperature or forcibly. The light refractive body 2d is fixed. Here, the amount of immersion of the light refractor 2d into the adhesive layer 2c is determined by the viscosity and degree of curing of the adhesive layer 2c, the force applied when dispersing the light refractor 2d, etc. Determine the conditions in advance. After the adhesive layer 2c is cured to a required degree, a transparent resin layer 2e is formed using an ultraviolet curable transparent paint to a thickness such that the light refracting body 2d is completely immersed therein, and then this transparent resin layer 2e is After curing the
A transparent protective layer 3 is formed on the transparent resin layer 2e by injection molding.

According to this invention, the light incident on the decorative layer 2 is refracted by the light refracting body 5d and then reflected by the metal layer 2'b,
Further, after being refracted by the light refracting body 2d, the light returns toward the light source, but at that time, it is colored by the colored and transparent glue layer 2c. For example, if the glue layer 2c is yellow, the light will be golden due to the silver color of the metal layer 2b, and if the glue layer 2c is green, the light will be green with a slight silver tinge. Therefore, cap A will appear in colors corresponding to these light colors. And cap A that looks like this color
The metal layer 2b has excellent brightness due to its inherent brightness and high reflection properties, and the shading of color and brightness and the boundaries between them appear more clearly, giving it a sufficiently deep three-dimensional effect. It turns out. That is, the cap A is spherical as shown in the figure, and the light incident on the decorative layer 2 does not return toward the light source and is not diffusely reflected. Therefore, as shown in FIG. Only in that part, another spherical contour A′ with excellent glitter appears,
Moreover, the boundary C of this spherical contour A' is clearly visible. Furthermore, in this embodiment, the light refractive body 2d is comprised of an adhesive layer 2c and a transparent resin layer 2.
Since it is located on the boundary line with the adhesive layer 2c and has a layered structure in which only the adhesive layer 2c is colored, it has excellent translucency as a whole. Raised as broken. Moreover, especially according to this embodiment, the transparent resin layer 2
Since we use ultraviolet curing paint for e, it can be cured instantly (about 5 to 10 seconds).
Therefore, the solvent contained in the transparent resin layer 2e may cause the dye and pigment contained in the adhesive layer 2c to be eluted to other parts, or the light refractive body 2d fixed by the adhesive layer 2c may be shifted to other parts. There is no fear that it will cause problems. That is, when the surface of the base material 1 is a curved surface (spherical surface) as in the example, no matter how the base material 1 is positioned so that the decorative layer 2 is applied to the surface of the base material 1, the base material 1 Since there is a vertical relationship on the surface, there is a continuous slope from the upper central part to the lower part of the surface, which is a factor that tends to cause elution of dyes and pigments and misalignment of the light refracting body 2d. However, in this example, as described above, an ultraviolet curable paint is used to instantly cure the paint, so there is no adverse effect on the layer structure applied immediately below. Further, after the transparent resin layer 2e is cured, the transparent protective layer 33 is formed on the transparent resin layer 2e by injection molding, which makes it easier to form the transparent protective layer 3. Instead, any resin material can be selected as long as it has sufficient transparency and is suitable for injection molding, and the necessary layer thickness of the transparent protective layer 3 is determined in advance by the injection mold. If this is done, this can be obtained by one injection molding. Therefore, from these reasons, if the thickness of the transparent protective layer 3 is made thick and a transparent resin material with high hardness is used as shown in the figure, , an abrasion-resistant protective layer 3 that is not easily scratched or peeled off is obtained.

In the above embodiment, the adhesive layer 2c is colored and transparent, and the protective layer 3 is transparent. However, conversely, the protective layer 3 may be colored and transparent, and the adhesive layer 2c may be transparent. When the protective layer 3 is colored and transparent in this way, it is only necessary to mix dyes and pigments into the protective layer 3, and since this protective layer 3 is formed last by injection molding, it is especially important to The fear of having an adverse effect on the applied layer structure is reliably eliminated.

In addition, in the embodiment, an example was described in which the outer surface of the protective layer 3 was formed into a smooth spherical surface, but since this protective layer 3 is injection molded, an unevenness is formed on the surface using the injection molding mold. However, it may be made to have different decorative properties. Further, in the embodiment, an example in which the present invention was applied to a cap was described, but it goes without saying that the present invention can also be applied to other containers that require excellent decorative properties, such as compact containers.

As described in detail above, according to the present invention, it is possible to have excellent brightness, precision, color shading, and boundaries between them, giving a sufficiently deep three-dimensional effect. It has excellent properties such as effectively increasing the weight and decoration, which is one of the elements required for containers, and also making it possible to sufficiently increase the surface abrasion resistance with a relatively easy method. be effective.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Figure 1 is a schematic external view of the cap, Figure 2 is a vertical sectional view,
FIG. 3 is a partially enlarged sectional view. 1... Base material, 2... Decoration layer, 2a... Adhesive layer,
2b... Metal layer, 2c... Adhesive layer, 2d... Light refractive material, 2e... Transparent resin layer, 3... Protective layer, A
...Cap, A'...spherical contour.

Claims (1)

[Scope of Claims] 1. A light-reflecting metal layer 2b is applied directly or via an adhesive layer 2a on a base material 1 whose surface is formed into a curved surface, and an adhesive made of transparent or colored transparent resin is applied on this metal layer 2b. After applying the adhesive layer 2c, transparent fine particle spherical light refracting material 2d is uniformly sprinkled on the adhesive layer 2c, and then, after drying and hardening the adhesive layer 2c, the adhesive layer 2c is A transparent resin layer 2e made of an ultraviolet curable transparent resin material is applied to the
The method for manufacturing a plastic container with a glittering curved surface is characterized in that, after the transparent resin layer 2e is cured, a transparent or colored transparent protective layer 3 is formed on the transparent resin layer 2e by injection molding. 2. The method for manufacturing a plastic container with a glittering curved surface according to claim 1, characterized in that either the adhesive layer 2c or the protective layer 3 is formed of a colored transparent resin.