JPH0687186A - Composite material of noble metal - Google Patents

Abstract

PURPOSE:To suppress occurrence of a crease of a thin sheet of a noble metal on the occasion when the thin sheet of the noble metal is covered, and also to prevent a change in the color tone of the covered thin sheet of the noble metal through a plastic sheet. CONSTITUTION:The surface and rear of a thin sheet 1 constituted of a noble metal or an alloy of the noble metal are covered in lamination with protective films 4 constituted of transparent resin, and each of the protective films 4 has a two-layer structure of an outer layer of a high mechanical strength and an inner layer of a high adhesion to the thin sheet 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a precious metal composite material mainly composed of precious metals such as gold, silver and platinum, which can be easily used as souvenirs and gifts and has a decorative value. Regarding

[0002]

2. Description of the Related Art Heretofore, a small gold ingot has been given a pattern on its surface by imprinting it with a mold as seen in coins and medals. By the way, in recent years, the popularity of gold has advanced, and the unit of gold handling has become smaller and trading has been started in gram units.

However, such a small amount of gold, which is press-formed as a coin or a medal with a certain thickness, does not look good because the shape is very small.
It had the drawback that it was not very effective as a souvenir or gift.

Therefore, it is conceivable that a gold ingot is rolled into a thin plate shape, the surface of which is marked by engraving or the like, and a pattern or a character according to the purpose is attached. In this case, for example, if 1 g of gold is extended to a thickness of 20 μm, it will be about the size of a business card, will look good enough, and can be easily distinguished from patterns and characters, which is suitable as a souvenir.

[0005]

However, in the prior art as described above, since a very thin plate is used as a material, the strength is low and it is easily deformed or damaged, and therefore it is inconvenient to handle. There is a defect.
Also, the contents of the markings as described above will differ depending on the purpose of being used as a souvenir or gift, and for that reason it is necessary to change according to each order received. However, there was also a problem that such orders could not be met, and the lot was small, so the cost was high.

[0006] Therefore, for example, Japanese Utility Model Publication No. 52-84472
As shown in No. 3, it is possible to cover a sheet-shaped material with pictograms with a plastic sheet to form a decorative plate.

However, if such a technique is applied to the precious metal thin plate which is the object of the present invention, the following problems occur.

That is, the noble metal formed into a thin plate by rolling is easily deformed, and if the adhesion between the noble metal thin plate and the plastic sheet is poor, the noble metal thin plate shifts from the plastic sheet when the noble metal thin plate is coated. This is a problem that it may cause wrinkles.

Further, since the plastic sheet is a transparent body, if a flaw is present on the surface of the plastic sheet, the color tone of the coated precious metal through the plastic sheet will change, and therefore a countermeasure is also required. It

[0010]

In order to solve the above problems, the noble metal composite material of the present invention is a laminate coating of the front and back surfaces of a thin plate made of a noble metal or an alloy of noble metals with a protective film made of a transparent resin. Thus, the protective film has a two-layer structure including an outer layer having high mechanical strength and an inner layer having high adhesiveness to the precious metal thin plate. Then, the surface of the precious metal thin plate may be subjected to marking or laser marking of the precious metal material, quality, weight, etc., and the pictograms having the above contents may be integrally mixed in the inner layer of the protective film. Good.

[0011]

In the precious metal composite material of claim 1, since the thin precious metal plate is covered with the protective film to be reinforced and is protected from mechanical and chemical wear, even if a thin layer of about several grams of gold is thinly spread, Deformation and damage can be prevented, and decorative items with a relatively large area (business cards, postcards, A4 paper size, etc.) can be provided, and they are easy to handle and can be carried and stored. Easy to do, and moreover,
It is possible to easily manufacture various decorative articles using this as a material.

The inner layer enhances the adhesiveness between the noble metal thin plate and the protective film to prevent the two from slipping, thereby preventing wrinkling of the noble metal thin plate during coating, and the outer layer to protect the surface of the protective film. It suppresses the occurrence of scratches on the surface and suppresses the change in color tone that is recognized through the protective film of the coated precious metal thin plate.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention, in which the reference numeral 1 indicates a thin metal plate.
This thin plate 1 is obtained by repeatedly rolling a block material having a purity of 99.99% or more to a thickness of 15 μm and cut into a business card size. On the back surface thereof, YAG (yttrium-
A laser beam is emitted from an aluminum-garnet) laser generator, and a character 2 indicating material, quality, and weight is given.

In this process, as the means for moving the laser beam, a well-known method of controlling the laser generator to change the irradiation position of the laser beam within the XY axis plane is adopted.

By changing the intensity of the laser beam, the depth of the irregularities forming the pattern can be adjusted appropriately. For example, if this is suppressed to about 1/10 of the plate thickness, the thin plate 1 itself. There is no chance that the front and back will overlap and the patterns will overlap. Further, since the mold is not pressure-bonded, the unevenness of the front does not appear on the back. In this method, by combining a device for moving a laser beam with an appropriate figure input device, it is easy, fast, and inexpensive to apply arbitrary figures, patterns, characters, portraits, certification marks, etc. to a thin plate. You can do it.

The content displayed on the precious metal thin plate 1 is not particularly limited, but when it is used as a wedding gift or the like, the family crests 3 of both houses may be applied in addition to the character 2. The shape of the precious metal thin plate 1 is not limited to the rectangular shape,
In addition to gold, appropriate materials such as silver and platinum or alloys thereof are used as the material.

As shown in FIG. 2, a protective film 4 made of a transparent resin is formed on the front and back surfaces of the thin plate 1 of noble metal and is slightly larger than the thin plate 1 (longitudinal dimension is about 1 mm longer on one side about 1 mm). The noble metal composite material 5 according to the present embodiment is formed by coating and crimping 4 and bonding these edge portions together.

As shown in FIG. 3, the protective film 4 has a thickness of 2
The outer layer (thickness: 100 μm) 4a has a layered structure, and the outer layer (thickness: 100 μm) is made of PET (polyethylene terephthalate) having high mechanical strength among thermoplastic resins.
The inner layer (thickness: 50 μm) 4b in contact with is composed of an ionomer resin (Surlyn resin: trade name), which is a thermoplastic resin that can be pressure-bonded to the surface of gold at a relatively low temperature.

When the protective film 4 has such a two-layer structure,
The shape change of the protective film 4 can be prevented and the noble metal thin plate 1 can be easily coated at a relatively low temperature.

In the noble metal composite material 5 having such a structure, since the front and back surfaces of the noble metal thin plate 1 are covered and reinforced with the protective film 4, even if a few grams of gold is thinly stretched, its deformation In addition, it is possible to prevent damage, and it is possible to provide a decorative article with a relatively large area (about a business card) that looks good. Moreover, it is easy to handle and can be easily carried and stored.

Moreover, since the protective film 4 and the precious metal thin plate 1 are securely bonded by the inner layer 4b, the deviation between the precious metal thin plate 1 and the protective film 4 which is thin and unstable in handling can be suppressed, and at the time of coating. It is possible to suppress the generation of wrinkles in the noble metal thin plate 1.

FIG. 4 shows a second embodiment of the present invention. The noble metal composite material 7 shown in this figure has pressure-bonded to the front and back surfaces of the noble metal thin plate 1 with the first protective films 8 and 8 having the same shape and area as the thin plate 1 and the two-layer structure similar to the first protective film 4 described above. It was done. Such a noble metal composite material 7 can of course obtain the same effects as those of the above noble metal composite material 5, but has an advantage that it is advantageous for mass production.

That is, in order to mass-produce the noble metal composite material 7, as shown in FIG. 5, the strip-shaped gold 10 is unwound from the roll 11 on which the strip-shaped gold 10 having a thickness of 15 μm is wound, and The strip-shaped resin 12 is unwound from a pair of rolls 13 and 13 around which the strip-shaped resin 12 having a two-layer structure made of PET and Surlyn resin is wound, preheated by preheating rolls 14 and 14, and these are further preheated. It sends from 14 and 14 to the pressure bonding rolls 15 and 15. The pressure-bonding rolls 15 and 15 are heated to approximately 100 ° C. to 150 ° C., the band-shaped resins 12 and 12 are heated by the pressure-bonding rolls 15 and 15 and pressure-bonded to the front and back surfaces of the band-shaped gold 10, respectively. Thus, the thin composite strip 16 having a three-layer structure is formed.

Then, as shown in FIG. 6, the noble metal composite material 7 is mass-produced by successively punching the central portion in the width direction of the thin composite strip 16 at predetermined intervals in the length direction into a business card size.

In this embodiment, the edge portion is trimmed, and when it is laminated on the transparent decorative plate as described later, the edge portion is simple and the decorative effect is high. Of course, since it is pressure-bonded with Surlyn resin, it does not come off easily.

Also in this embodiment, as in the first embodiment, wrinkles are prevented from occurring in the noble metal thin plate 1 and an apparent color tone change of the noble metal thin plate 1 after coating is prevented.

In each of the above-mentioned embodiments, an example in which the precious metal thin plate 1 is marked is shown, but instead of this,
By coloring the inner layer 4b of the protective film 4 so that pictograms are integrally mixed in this inner layer, and the noble metal thin plate 1 is covered with the protective film 4, the outer layer 4a of the protective film 4 and the noble metal thin plate 1 are It is also possible to interpose a pictogram between them.

[0028] The noble metal thin plate 1 has such a structure.
Since it is difficult to print directly on the paper, the marking method is limited, and there is a limit to applying pictographs with color changes, this is a measure to eliminate the problem. That is, since the inner layer 4b is a resin layer, it is easy to paint a colored and fine pattern.

[0029]

As described above in detail, according to the noble metal composite material of the present invention, since the noble metal thin plate is covered with the protective film to be reinforced and protected from mechanical and chemical wear, it is about several grams. Even if it is thinly extended, its deformation and damage can be prevented, and it is possible to provide a decorative article with a relatively large area (about the name of a business card) that looks good, and it is easy to handle and possess. It can be stored easily.

Further, since the protective film and the precious metal thin plate are securely joined by the inner layer, the deviation between the thin and unstable handling of the precious metal thin plate and the protective film is suppressed, and wrinkles of the precious metal thin plate during coating are suppressed. Occurrence can be suppressed.

Further, since the outer layer is not easily scratched, the transparency of the protective film is maintained for a long period of time, and it is possible to prevent the appearance of the precious metal thin plate inside from being changed.

By applying pictograms to the inner layer of the protective film, it is possible to obtain a precious metal composite material having colored pictograms, which is difficult to print directly on the precious metal thin plate.

[Brief description of drawings]

FIG. 1 is a plan view of a noble metal thin plate used in an embodiment of the present invention.

FIG. 2 shows an embodiment of the present invention and is a perspective view showing a state in which a precious metal thin plate is covered with a protective film.

FIG. 3 is a cross-sectional view of a protective film used in an example of the present invention.

FIG. 4 is a perspective view of a noble metal composite material according to another embodiment of the present invention.

FIG. 5 is an explanatory view for explaining a method for producing a noble metal composite material of the present invention.

FIG. 6 is a plan view of a thin composite strip for explaining the method for producing the noble metal composite of the present invention.

[Explanation of symbols]

 1 Noble metal thin plate 4.8 Protective film 4a Outer layer 4b Inner layer 5.7 Noble metal composite

Claims (2)

[Claims] 1. A thin plate made of a noble metal or an alloy of a noble metal is laminated and coated with a protective film made of a transparent resin on the front and back surfaces, and the protective film has an adhesive property between an outer layer having high mechanical strength and the thin plate. A noble metal composite material having a two-layer structure with a high inner layer. 2. The precious metal composite material according to claim 1, wherein pictograms are integrally mixed in the inner layer.