JP2003165548A - Metallic container having hologram and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic container having a hologram which can be applied for a mass production and can attach the hologram without additional manufacturing steps for the metallic container and further to provide a method for manufacturing the metallic container. <P>SOLUTION: A hologram 12 constituted by a groove 12a extending along a forming direction of a metallic container 10 and having a regular characteristic is formed in at least a part of the surface of the metallic container 10. With such an arrangement as above, it is possible to attach the hologram 12 by the groove 12a having a regular characteristic to be attached by a forming tool for the metallic container 10 and further it becomes possible to perform a mass production without increasing the number of manufacturing steps. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram-equipped metal container and a method for manufacturing the same, which enables a hologram to be attached during the molding process of the container without requiring a special process.

[0002]

2. Description of the Related Art In metal containers such as beverage cans and food cans, the body of the can is decorated by printing or the like. By attaching a rainbow-colored hologram to the metal container. , It has been proposed to give a design that is different from the decoration by printing so far.

As a method of attaching such a hologram to a metal container, there is one disclosed in, for example, Japanese Patent Laid-Open No. 32-32946. First, a photoresist is irradiated with laser interference light to form fine irregularities on the surface. An electroformed original plate made of nickel is formed on which the uneven pattern is formed. Then, the nickel electroforming original plate is pressed against the outer surface of the metal container to transfer a fine pattern, thereby reproducing and attaching the hologram to the outer surface of the metal container.

In the method disclosed in Japanese Unexamined Patent Publication No. 10-329831, an electroforming original plate made of nickel similar to the above is prepared, and an uneven shape is embossed on the outer peripheral surface of a metal jacket roll. Every time, it is continuously transferred to a long thermoplastic resin film and subjected to embossed hologram processing, and a printing layer and an adhesive layer are formed on the back surface to form a sticking print film, which is stuck to the outer surface of a metal container. This is what attaches the hologram.

[0005]

However, in the former method in which a nickel electroforming plate is pressed against the outer peripheral surface of the metal container to directly transfer a fine uneven pattern, the electroforming plate is severely worn and the metal container In order to apply it to mass production, a large number of electroformed original plates are required, and there is a problem that the production cost for that is increased.

On the other hand, in the latter method of producing a printing film for sticking in advance and sticking this film on a metal container,
There is a problem that a manufacturing process of the adhesive printing film is required, and a step of adhering the manufactured adhesive printing film to a metal container is also required, which causes a large increase in the number of processes.

The present invention has been made in view of the above-mentioned problems of the prior art, can be applied to mass production, and a hologram-equipped metal container capable of attaching a hologram without increasing the number of steps of the metal container used up to now. And a method for manufacturing the same.

[0008]

As a result of intensive studies on the manufacturing process of holograms and metal containers in order to solve the above problems, it is found that holograms shining in rainbow colors are not only complicated interference lights but also vertical stripe interference lights. It was found that the hologram can be reproduced by itself, and if the irregular fine-line-shaped irregularities can be formed in the case of forming a metal container by drawing and ironing, for example, the hologram can be reproduced. The specific configuration is as described below.

That is, the hologram-equipped metal container according to claim 1 of the present invention has a hologram formed on at least a part of the surface of the metal container along the molding direction of the container and having a groove having regularity. It is characterized by becoming.

According to this hologram-equipped metal container, longitudinal fine grooves extending along the molding direction of the container are formed on at least a part of the surface of the metal container, the grooves being regularly arranged in a direction orthogonal to the grooves. The hologram is formed of a set, and the hologram can be attached by the groove having regularity provided by using the forming tool of the metal container, and mass production can be performed without increasing the number of steps.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the hologram-equipped metal container has the grooves having regularity with a pitch of less than 35 μm and a depth of 0.1-5. It is characterized by being configured as 0.0 μm.

According to this hologram-equipped metal container, the grooves having regularity are configured such that the pitch is less than 35 μm and the depth is 0.1 to 5.0 μm, and there is such regularity. The groove makes it possible to reproduce the rainbow color of the hologram.

Further, in the hologram-equipped metal container according to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the regularity of the grooves is defined by a pitch and / or a depth having a plurality of regularities. It is characterized by being configured.

According to this hologram-equipped metal container, the regularity of the groove is constituted by a plurality of regular pitches and / or depths, and a single regularity is obtained at a certain pitch and a certain depth. Not only that, the rainbow color due to the hologram can be reproduced by using grooves having pitches and depths having a plurality of regularities such as combining other pitches and depths.

Further, in the hologram-equipped metal container according to claim 4 of the present invention, in addition to the structure according to any one of claims 1 to 3, the metal container is either a squeezed ironing can or an impact can. It is characterized by.

According to this hologram-equipped metal container, the metal container is either an squeezing ironing can or an impact can, and the hologram can be attached by a forming tool during the forming process of these cans. .

The drawn and ironed cans referred to in the present application include, in addition to so-called DI cans, thin-walled deep drawn-ironed and formed cans.

Further, in the method of manufacturing a hologram-equipped metal container according to claim 5 of the present invention, in manufacturing a metal container having a hologram attached to at least a part of its outer surface,
At least a part of a molding tool for molding the outer surface of the metal container is provided with a hologram processing portion formed by grooves having regularity parallel to the molding direction, and the hologram is processed at the same time when the metal container is molded. It is characterized by having attached.

According to this method for manufacturing a metal container with a hologram, a hologram processing is provided in which at least a part of the molding tool for molding the outer surface of the metal container is formed with grooves having regularity parallel to the molding direction. Section is set up,
The hologram is attached at the same time as the metal container is formed, and the hologram processing portion of the forming tool allows the hologram to be attached by forming a groove having regularity at the same time as the metal container is formed and processed. It will be possible to mass-produce without.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the method for manufacturing a hologram-equipped metal container further comprises a regular groove of a hologram processing portion formed in advance in the molding tool, The pitch is less than 35 μm and the depth is 0.1 to 5.0 μm.

According to this method for manufacturing a metal container with a hologram, the grooves having the regularity of the hologram processed portion formed in advance in the molding tool have a pitch of less than 35 μm and a depth of 0.1 to 5.0 μm. The hologram groove can be reproduced by the regular grooves of the hologram processed portion.

Further, in the method of manufacturing a hologram-equipped metal container according to a seventh aspect of the present invention, in addition to the configuration according to the fifth or sixth aspect, the groove regularity of the hologram processed portion is
It is characterized in that it is configured with a pitch and / or a depth having a plurality of regularities.

According to this method of manufacturing a metal container with a hologram, the regularity of the grooves of the hologram processed portion is configured by a plurality of pitches and / or depths having regularity, and a certain pitch and a certain depth are provided. It is possible to manufacture a metal container that can reproduce the rainbow color by hologram not only by a single regularity depending on the size, but also by setting a pitch and depth with multiple regularities such as combining other pitches and other depths respectively. become.

According to the eighth aspect of the present invention, there is provided a method of manufacturing a hologram-equipped metal container, wherein in addition to the configuration according to any of the fifth to seventh aspects, the forming tool is a drawing / ironing forming tool or an impact. It is characterized in that it is one of the molding tools.

According to this method for producing a hologram-equipped metal container, the forming tool is either a drawing and ironing forming tool or an impact forming tool. It becomes possible to attach a hologram by these molding tools.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 relate to an embodiment applied to an aluminum can for beverages as a hologram-equipped metal container of the present invention. FIG. 1 is a sectional view in which a right half is cut away, and FIG. 2 is a right half in a molding process. It is sectional drawing which notched.

The aluminum can 10 for beverages as the hologram-equipped metal container is obtained by, for example, drawing and ironing a metal plate to obtain a can body 11, and at the same time as the can body 11 is formed, the can body 11a. The hologram 12 is attached to the outer surface of the.

The hologram 12 attached to the aluminum can 10 is a fine vertical groove 12a having a regularity along the vertical direction (the vertical direction of the paper surface in FIGS. 1 and 2) which is the molding processing direction of the can body 11. It is composed by.

The regular fine vertical grooves 12a forming the hologram 12 have a parallel uneven pitch of 35 μm.
m or less, preferably 30 μm or less and a depth of 0.1 to
By forming irregularities of 5.0 μm, preferably 0.2 to 2.0 μm, which are regularly arranged, light reflected by these irregularities causes interference to reproduce a rainbow-colored hologram.

When the pitch of the parallel unevennesses forming the vertical grooves 12a is 35 μm or more, the rainbow hologram cannot be reproduced, and if it is less than 35 μm, it is better to be as small as possible. The lower limit is, for example, about 5 μm, but this value is not always the limit.

Further, if the depth of the parallel irregularities forming the vertical groove 12a is smaller than 0.1 μm, the rainbow hologram cannot be reproduced, and even if the depth exceeds 5.0 μm and becomes deeper. The effect on the reproducible hologram does not change, and the processing is difficult, and the depth of the unevenness is preferably in the range of 0.2 to 2.0 μm.

Therefore, as the regular fine vertical grooves 12a, for example, as shown in FIG. 3A, the pitch of the unevenness is 10 μm, the depth of the unevenness is 1.0 μm, and the vertical grooves 12a are continuous. It can be made to have regularity by being repeated.

As the regular fine vertical grooves 12a, only the pitch is changed to another value from 10 μm to less than 35 μm so as to be repeated continuously, and regularity is imparted.
One regularity (a pitch of a certain value and a certain value of one The vertical groove 12a may have a depth.

Further, the regular fine vertical grooves 12a have not only one regularity composed of a pitch of one value and a depth of one value, but also two or more pitches or two or more pitches. The depths of a certain number of irregularities to have a plurality of regularities, or one irregularity to have a plurality of pitches or two or more depths to have a plurality of regularities. The pitch may be less than 35 μm and the depth may be in the range of 0.1 to 5.0 μm.

In an aluminum can or the like which is drawn and ironed, there are cases where streak-shaped grooves (scratches) are usually formed during the molding process, but these streak-shaped grooves are
For example, as shown in the measurement results of the surface roughness in FIGS. 4A to 4C, the regularity is poor, and even if it looks slightly rainbow-colored, it is not included in the hologram formed by the regular flutes. However, regular flutes formed by positively processing the forming tool are included in the hologram here.

According to the aluminum can 10 for beverages as such a hologram-equipped metal container, irregularities, which are fine vertical grooves 12a having regularity, are formed along the vertical direction which is the molding direction of the can body 11. Therefore, the light reflected by these irregularities causes interference to reproduce a rainbow-colored hologram.

The hologram 12 attached to the can body 11 of the aluminum can 10 is not limited to being attached to the entire circumference of the can body 11, and may be attached to a part of the outer surface. For example, a hologram can be partially attached by forming a group of vertical grooves only in a part of the circumference of the can. Also in the length direction of the can body, a vertical groove may be formed over the entire length in the molding processing direction, and a hologram may be attached, or a hologram may be attached partially. It is possible to partially form the groove in the length direction of the can body, for example, by changing the diameter of the punch in the length direction of the punch.

It is also possible to make the hologram invisible in a printing layer that does not transmit light by providing a hologram on the entire circumference and covering it by printing after drawing and ironing. Furthermore, it is also possible to print the pattern of only the outline on the hologram so that the inside of the outline looks like a rainbow color.For example, if you print the outline of a rose flower on the hologram, it will look like a rainbow-colored rose pattern. In particular, if the hologram 12 is wider than the entire circumference or the contour, it is not necessary to align the printing of the contour pattern.

It should be noted that the hologram can be reproduced by performing printing such as transparent transmission of light on the hologram.

Next, a method of manufacturing such a hologram-equipped metal container will be described with reference to FIG. 2 by way of example of drawing and ironing of the aluminum can 10.

In the drawing and ironing of the aluminum can 10, first, the drawing and shaping are performed, and a cup-shaped drawing with a bottom is performed by using a forming tool combining a punch and a die while pressing an aluminum disc-shaped plate with a wrinkle holding device. Form into a compact.

After that, ironing forming is performed in which the side wall of the drawn body of the drawn cup is thinned and stretched. Simultaneously with this ironing, the vertical groove 12a which becomes the hologram 12 is formed.
The unevenness formed by is attached to the outer surface of the can body 11.

As this ironing forming, for example, drawing / ironing forming as shown in FIG. 2 is performed and forming is performed using an ironing ring die 21 and a coaxial punch 22. Here, the aluminum can 10 is used as a forming tool. The hologram processing section 2 is formed on the inner peripheral surface of the ironing ring die 21 that regulates the outer periphery of the
1a is formed.

This ironing ring die 21 is usually composed of tool steel and a cemented carbide on the inner periphery thereof, and it is necessary to form a hologram processed portion 21a in this cemented carbide portion. For example, laser processing, It can be formed by electric discharge machining, cutting using a diamond disk or the like, and as an example of processing, a hologram processed portion 21a having a concave and convex pitch of 10 μm and a depth of 2 to 3 μm is formed by cutting with a diamond disk. Also, in wire electrical discharge machining, the pitch of irregularities is 20 μm and the depth is 4 μm.
It was possible to form the hologram processed portion 21a.

The ironing process performed by using such an ironing ring die 21 is performed by punching the punch 22 into the ironing ring die 21.
The side wall is thinly extended by advancing inward, and at the same time as the ironing and molding with the ironing ring die 21, the hologram processing section 2 is formed.
With 1a, a vertical groove 12a is formed along the working direction which is the pushing direction of the punch 22.

As a result, the molded aluminum can 10
Fine longitudinal grooves 12 having regularity on the outer surface of the can body 11 along the longitudinal direction which is the molding process direction of the can body 11.
The unevenness of a is formed, and the light reflected by these unevenness causes interference to reproduce a rainbow-colored hologram.

After the ironing, the aluminum can 10 is subjected to the doming process at the bottom, and the neck-in process and the flange process at the opening to obtain the aluminum can 10 as shown in FIG. Become.

During the molding of the aluminum can 10 as described above, the hologram 12 can be attached to the outer surface of the can body 11 by the hologram processing portion 21a formed on the ironing ring die 21. Compared to the case where a film is attached and a hologram is attached, the hologram can be attached easily with almost no increase in steps and costs.

Thus, by applying the hologram as a part of the printing screen such as applying a contour pattern on the hologram by printing, it is possible to easily attach a rainbow-colored shining pattern, etc., as compared with the conventional printing. The decorativeness can be increased.

Further, since the hologram is formed at the hologram processing portion 21a formed on the ironing ring die 21, there is no problem of abrasion unlike the conventional electroformed original plate,
Cans with holograms can be mass-produced.

In the above embodiment, the aluminum container for beverage which is drawn and ironed as the hologram-equipped metal container has been described as an example. However, the container is not limited to the beverage but can be used for other purposes. The metal material is not limited to aluminum, and steel such as tin plate may be plated. In addition to the DI can which is drawn and squeezed by forming a hologram during molding, an impact can which is impact molded may be used.

[0052]

EXAMPLES Examples of the metal container with hologram of the present invention will be described below, but the present invention is not limited thereto.

Here, the following experiment was conducted in order to investigate the manifestation property of the hologram due to the regular fine vertical grooves.

A hologram processing portion having a constant groove pitch and a constant groove depth was formed in parallel with a large number of linear fine grooves by cutting with a diamond grindstone on the surface of a plate-shaped mold. And, the thickness of 50 μm is applied to the hologram processing part of this mold
The aluminum foil of m was pressed to transfer fine vertical grooves to the surface of the aluminum foil, and the reproduced state of the hologram on the transferred aluminum foil was visually evaluated.

As a hologram processed portion formed in a concrete mold, the groove pitch of the vertical grooves is 8 μm, 10 μm, 20 μm.
m, and the groove pitch was 35 μm as a comparative example.

The pitch of the vertical grooves on the transferred aluminum foil surface was the same as that of the mold.

Further, the groove depth of the hologram groove formed on the die is 0.1 μm, 0.3 μm, 0.6 μm, 1.0 μm on the surface of the aluminum foil after transfer. I did it.

Table 1 shows the groove pitch and groove depth.
Aluminum foils with holograms were prepared for the examples of the nine combinations shown in and the two comparative examples.

The hologram is evaluated in four levels, and when the hologram is visible from a wide range of directions and the hologram contains green or blue colors, the hologram is visible from various directions, but not visible. There are also red and yellow colors in the hologram, and there are few green and blue colors, and there is a direction in which the hologram can be seen depending on the angle of light, and in the case of holograms of red and yellow colors, △ , And when the hologram could not be seen at all or almost, it was marked as ×.

The results of these evaluations are shown in Table 1. In the nine examples, ⊚-Δ, but in the two comparative examples, all were x.

[0061]

[Table 1]

[0062]

As described above in detail with the embodiments, according to the hologram-equipped metal container of the present invention, at least a part of the surface of the metal container extends along the molding process direction of the container. Since a hologram composed of a groove having regularity is formed together with it, the hologram can be attached by the regular groove provided by using the molding tool of the metal container, and the metal having the hologram can be attached without increasing the number of steps. The container can be mass-produced.

According to the hologram-equipped metal container of the second aspect of the present invention, the grooves having regularity are formed with a pitch of less than 35 μm and a depth of 0.1 to 5.0 μm. The rainbow color due to the hologram can be reproduced by such regular grooves.

Further, according to the hologram-equipped metal container of the third aspect of the present invention, the regularity of the grooves is constituted by a plurality of regular pitches and / or depths.
Not only a single regularity with a certain pitch and a certain depth,
The rainbow color due to the hologram can be reproduced by using grooves having pitches and depths having a plurality of regularities such as combinations of other pitches and depths.

Further, according to the hologram-equipped metal container according to the fourth aspect of the present invention, since the metal container is either a squeezing ironing can or an impact can, the hologram is attached by a forming tool during the forming process of these cans. be able to.

Further, according to the method for manufacturing a hologram-equipped metal container according to the fifth aspect of the present invention, at least a part of the molding tool for molding the outer surface of the metal container is parallel and regular along the molding process direction. Since the hologram processing part constituted by the groove is provided and the hologram is attached at the same time when the metal container is formed, the hologram processing part of the forming tool forms a groove having regularity at the same time when the metal container is formed. Can be processed to attach a hologram, and mass production can be performed without increasing the number of steps.

Further, according to the method of manufacturing a hologram-equipped metal container of the sixth aspect of the present invention, the grooves having the regularity of the hologram processed portion formed in advance in the molding tool have a pitch of less than 35 μm and a depth. Is 0.1 to 5.0 μm, the rainbow color due to the hologram can be reproduced by such a regular groove of the hologram processed portion.

Further, according to the method for manufacturing a hologram-equipped metal container of the seventh aspect of the present invention, the regularity of the grooves of the hologram processed portion is constituted by a plurality of regular pitches and / or depths. Therefore, not only a single regularity with a certain pitch and a certain depth, but also a plurality of regularities with a combination of other pitches and other depths, etc. It is possible to manufacture a metal container that reproduces.

Further, according to the method of manufacturing a hologram-equipped metal container according to the eighth aspect of the present invention, since the forming tool is either the drawing and ironing forming tool or the impact forming tool, the drawing and ironing forming is performed. Holograms can be attached to cans made by, or cans made by impact molding using these molding tools.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in which a right half is cut away according to an embodiment applied to an aluminum can for beverage as a metal container with hologram of the present invention.

FIG. 2 is a cross-sectional view in which the right half is cut away in the molding step according to one embodiment applied to an aluminum can for beverage as a metal container with hologram of the present invention.

FIG. 3 is a view showing an embodiment of a metal container with a hologram of the present invention, (a) is an explanatory view showing a shape of a flute of a hologram processed portion formed in a molding tool as a roughness curve, (b).
FIG. 4 is an explanatory view showing a vertical groove shape on the surface of the aluminum foil when the vertical groove of the forming tool is transferred to the surface of the aluminum foil as a roughness curve.

FIG. 4 is an explanatory diagram showing the surface condition of a normal drawn and ironed can as a roughness curve based on the roughness measurement results.

[Explanation of symbols]

10 Aluminum can (metal container with hologram) 11 can body 11a can body 12 hologram 12a Vertical groove (groove) 21 Ironing ring die (molding tool) 21a Hologram processing section 22 punch

Claims (8)

[Claims] 1. A metal container with a hologram, characterized in that a hologram is formed on at least a part of the surface of the metal container, the hologram being formed along the molding direction of the container and having regularity. 2. The groove having the regularity has a pitch of 35.
The hologram-equipped metal container according to claim 1, wherein the metal container has a diameter of less than 0.1 μm and a depth of 0.1 to 5.0 μm. 3. The hologram-equipped metal container according to claim 1, wherein the regularity of the grooves is formed by a plurality of regular pitches and / or depths. 4. The metal container is one of a squeezing ironing can and an impact can.
The metal container with a hologram according to any one of 3 to 3. 5. When manufacturing a metal container in which a hologram is attached to at least a part of the outer surface, at least a part of a forming tool for forming the outer surface of the metal container is parallel to the forming direction and has regularity. A method of manufacturing a hologram-equipped metal container, characterized in that a hologram processing portion constituted by a groove is provided and a hologram is attached simultaneously with the molding processing of the metal container. 6. The groove having a regularity of a hologram processed portion formed in advance in the molding tool has a pitch of less than 35 μm and a depth of 0.1 to 5.0 μm. 5. The method for manufacturing the hologram-equipped metal container according to item 5. 7. The regularity of the groove of the hologram processed portion is set to
The method for manufacturing a hologram-equipped metal container according to claim 5 or 6, wherein the metal container is provided with a pitch and / or a depth having a plurality of regularities. 8. The method of manufacturing a hologram-equipped metal container according to claim 5, wherein the forming tool is one of a drawing and ironing forming tool and an impact forming tool.