JPH1110788A - Precious metal composite plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precious metal composite plate with a precious metal insetted way deep upto the end part and not exposed from the end face. SOLUTION: A gold card 20 as a precious metal composite plate is composed of a precious metal thin plate (gold foil) 11 and protecting coats 12, 12 contact- bonded on both faces of the gold foil 11. The protecting coats 12, 12 are of a two-tier structure as organic coats. The end part of the gold card 20 is not exposed to the outside by wrapping the end part of the gold foil 11 with the inner layers 12b. In addition, the gold card 20 has the gold foil 11 insetted way deep upto an area near the end face, so that the gold card 20 appears presentable and shows an increasing decorative worth. Further, the gold foil 11 is not exposed from the end part of the gold card 20, so that the weight of a precious metal is prevented from changing due to the rubbing of the gold foil 11 while the gold card 20 is handled or the protecting coats 12, 12 are prevented from being peeled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to souvenirs, gifts,
The present invention relates to a noble metal composite plate mainly composed of a noble metal or a noble metal alloy such as gold, silver, and platinum, which can be easily used as a members' card and has a decorative value, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Heretofore, noble metals such as gold and platinum have been provided with a pattern on the surface by engraving using a mold as seen in coins and medals. By the way, in recent years, with the popularization of precious metals, the handling units of gold, platinum and the like have become smaller, and trading in gram units has been made. However, such a small amount of precious metal formed into a coin or a medal or the like by press molding in a state of having a certain thickness does not have a good appearance because of its small shape, and is less effective as a souvenir or a gift. There was a drawback.

[0003] Therefore, there has been provided a noble metal composite plate in which a lump of noble metal is rolled into a thin plate shape, and the surface of the noble metal plate is provided with a decorative pattern, characters, or the like according to the purpose. In this case, for example, when 1 g of gold is rolled to a thickness of 20 μm, it can be made into a thin plate having an area about the size of a business card, so that it looks good enough.
Since decorative patterns, characters, and the like can be easily provided, the present invention is also effective as a souvenir or a gift.

FIG. 5 shows such a noble metal composite plate 10. The noble metal composite plate 10 has a transparent resin film (protective film) 2 coated on both surfaces of a thin plate 1 made of a noble metal such as gold, silver, platinum or the like, or a noble metal alloy. The transparent resin films 3 are overlapped, and the whole is covered with a transparent transparent resin film 4 and integrated.

[0005]

However, the conventional noble metal composite plate 10 has a transparent resin film 4 as the outermost layer.
No precious metal is contained up to the end, and there is a region of only the transparent resin film 4 at the end of the precious metal composite plate, so that there is a disadvantage that the appearance is not good. Further, since the conventional noble metal composite plate is double-coated with the transparent resin films 2 and 4, not only the manufacturing process is complicated but also there is a disadvantage that the entire noble metal composite plate becomes thick.

On the other hand, if the outermost layer is not covered with the transparent resin film 4, the noble metal thin plate 1 is exposed on the end face, and the noble metal is rubbed during handling to change the amount of the noble metal. This results in a disadvantage that the film is peeled off.

Accordingly, the present invention has been made in view of the above circumstances, and provides a noble metal composite plate in which a noble metal penetrates into the vicinity of an end face and the noble metal is not exposed from the end face, and a simple manufacturing method of the noble metal composite board. The purpose is to provide.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a noble metal sheet made of a noble metal or an alloy of a noble metal, and a protective film coated on both surfaces of the noble metal sheet. Wherein the protective film includes an inner layer and an outer layer, and the inner layer covers an end of the noble metal sheet.

In the present invention, since the noble metal enters the vicinity of the end face of the noble metal composite plate, the appearance is improved and the decorative value is increased. On the other hand, since the noble metal is not exposed from the end of the noble metal composite plate, the noble metal is not rubbed during handling, so that the amount of the noble metal changes and the protective film does not peel off. Further, since it is not necessary to cover the protective film twice, the noble metal composite plate can be made thin.

[0010] In the second aspect of the present invention, the first aspect is provided.
In the noble metal composite plate described above, the end of the noble metal thin plate is covered in a bent state. In the present invention, since the protective film and the thin precious metal plate are firmly adhered to each other, the protective film does not peel off during handling.

According to the third aspect of the present invention, a noble metal thin plate made of a noble metal or a noble metal alloy is covered with a protective film, and the distance between the blade surfaces at the time of engagement of a pair of cutting blades arranged opposite to each other is determined. 0.3 ~ of thickness of coated noble metal sheet
The precious metal thin plate is set within a range of 10%, the blade is meshed with the precious metal thin plate, and the end of the noble metal thin plate is covered with a protective film.
According to the present invention, the end of the noble metal composite plate can be coated very easily only by performing the cutting while setting the amount of separation of the cutting blade to a predetermined value.

According to the present invention, a noble metal sheet made of a noble metal or a noble metal alloy is coated with a protective film, the coated noble metal sheet is cut into a predetermined shape with a heated blade, and the end of the noble metal sheet is cut by the protective film. The part is covered. According to the present invention, it is possible to very easily coat the end of the noble metal composite plate simply by cutting with a heated blade.

According to the present invention, a noble metal sheet made of a noble metal or an alloy of a noble metal is coated with a protective film, the coated noble metal sheet is cut into a predetermined shape, and the cut surface of the coated noble metal sheet is covered with the protective film. The edge of the noble metal sheet is covered by applying an organic solvent that dissolves the film. According to the present invention, only by applying an organic solvent,
The end of the noble metal composite plate can be coated very easily.

[0014]

Next, a noble metal composite plate and a method of manufacturing the same according to the present invention will be described in detail with reference to the drawings. As schematically shown in FIG. 1, a gold card 20 as a noble metal composite plate of the present invention includes a noble metal thin plate (gold foil) 11,
Pictograms (including designs, letters, landscapes, pictures, etc.) are printed, and the protective films 12, 1 are pressed against both surfaces of the precious metal thin plate 11.
And 2.

As shown in FIG. 2, the gold foil 11 as a precious metal thin plate is cut into a business card size by repeatedly rolling a lump of gold having a purity of 99.9% or more, for example, to a thickness of 15 μm. It is a thin plate with a weight of 1 g.

The protective films 12 and 12 are, for example, an organic film having a two-layer structure that transmits visible light, and have an outer layer 12a (thickness: 1).
00 μm) is made of PET (polyethylene terephthalate) having high mechanical strength among thermoplastic resins,
The inner layer 12b (thickness: 20 μm) that is in contact with the gold foil 11 is made of a thermoplastic resin ionomer resin (Surlyn resin: trade name) that can be pressed against the surface of gold at a relatively low temperature. At the end of the gold card 20, the gold foil 11 is covered with the inner layer 12b in a bent state so as not to be exposed to the outside.

A method of manufacturing such a gold card 20 will be described with reference to FIG. First, a gold foil 11 having a thin plate shape (for example, thickness: 15 μm, width: 50 mm) is manufactured by rolling. Then, both sides of the gold foil 11 are sandwiched between two strip-shaped protective films 12 and are adhesively coated with a heated roll. Thereby, the coated noble metal sheet 13 is obtained. Next, the coated precious metal thin plate 13 is punched one after another in a business card size at predetermined intervals in the width direction at a central portion in the width direction to mass-produce the gold card 20. Instead of punching, a method may be used in which the sheet is cut into a predetermined width by a slitter and then cut by a predetermined size cutter at a predetermined length.

Incidentally, the end face processing of the gold card 20 shown in FIG. 2 is performed by the following method. As shown in FIG. 4, the punching is performed by two blades 14 and 15 arranged opposite to each other.
Is performed by lowering one of the blades 15 from above the coated noble metal thin plate 13. At this time, the two blades 14,
The clearance d (the amount of separation between the blade surfaces) of the 15
1 and the thickness of the protective films 12, 12 are set to 0.3 to 10%. As a result, the tip of the blade 15 cuts the coated noble metal sheet 13 and at the same time, the gold foil 1 in contact with the blade surface is cut.
1 is bent, and the inner layer 12b of the protective film 12 is formed thereon.
Covers the end surface of the gold foil 11 (see FIG. 2).

Table 1 shows the results in the case where the clearance d was appropriately changed within the range of 0.1 to 15% and punching or slit and fixed size cutting were performed. In Table 1, the exposure of the gold foil observed with the naked eye and a 50 × optical microscope was defined as “appearance observation”, and after immersion in aqua regia at 50 ° C. for 12 hours, the concentration of gold in the aqua regia was measured using an ICP emission spectrometer. Is referred to as "aqua repellent", a portable test was performed, and the results of observing the appearance such as peeling of the end surface and the presence or absence of the gold foil with the naked eye and a 50-fold optical microscope were indicated as a "portable test".

[0020]

[Table 1]

As described above, the clearance d is 0.1%,
When 0.2% and 15% were used, the results were poor, whereas when the clearance d was within the range of 0.3 to 10%, all of the appearance observation, aqua regia dissolution, and the portable test were good. It can be seen that the setting within this range is preferable. As described above, the edge of the noble metal composite plate can be coated very easily only by performing the cutting while setting the clearance d of the cutting blade to a predetermined value.

After cutting with a slit and a fixed size cut with a clearance d of 0.1%, an organic solvent which does not dissolve the outer layer but dissolves only the inner layer, for example, acetone,
When butyl carbitol or isobutyl acetate is applied with a brush, the result is good because the dissolved inner layer covers the end of the gold foil. in this way,
By simply applying the organic solvent to the end of the noble metal composite plate, the end can be coated very easily.

Further, when the blade is heated at 100 ° C. with hot air at a clearance d of 0.1% and cut by slitting and slicing, the protective film is melted by the heat of the blade and the edge of the gold foil at the end is cut. Since the part is covered, it can be seen that the result is good. Thus, the edge of the noble metal composite plate can be coated very easily only by cutting with the heated blade.

Thus, in the gold card 20 of the present invention,
As shown in FIG. 1, the gold foil 11 penetrates into the vicinity of the end face, so that the appearance is improved and the decorative value is increased.
As shown in FIG. 2, since the end of the gold card 20 is covered with the inner layer 12b of the protective film 12, it is possible to prevent the gold foil from being rubbed during handling to change the amount of noble metal or to peel off the protective film. Is done.

Further, since there is no need to double coat the protective film, the thickness of the gold card 20 can be reduced. further,
Since the gold foil 11 is covered with the inner layer 12b in a bent state, the degree of adhesion between the inner layer 12b and the vicinity of the end of the gold foil 11 is increased, and the inner layer 12b does not peel off during carrying.

[0026]

As described above, according to the first aspect of the present invention, the noble metal penetrates into the vicinity of the end face of the noble metal composite plate, so that the appearance is improved and the decorative value is increased. On the other hand, since the noble metal is not exposed from the end of the noble metal composite plate, it is possible to prevent the noble metal from being rubbed during the handling and the amount of the noble metal from changing or the protective film from being peeled off. Also, since there is no need to double coat the protective film,
The noble metal composite plate can be made thin.

According to the second aspect of the present invention, since the end of the noble metal sheet is covered in a bent state, the degree of adhesion to the inner layer is increased, and the protective film is peeled off during handling. Is prevented.

According to the third aspect of the present invention, the edge of the noble metal composite plate can be coated very easily only by setting the amount of separation of the cutting blade to a predetermined value and performing cutting.

According to the fourth aspect of the present invention, the edge of the noble metal composite plate can be coated very easily only by cutting with a heated blade.

According to the fifth aspect of the present invention, it is possible to very easily coat the end of the noble metal composite plate simply by applying it to the end of the composite plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a gold card which is a noble metal composite plate according to the present invention.

FIG. 2 is an enlarged sectional view of an end of a gold card.

FIG. 3 is a diagram illustrating a method of manufacturing a gold card by punching.

FIG. 4 is a cross-sectional view illustrating cutting of a gold card.

FIG. 5 is a perspective view showing a schematic configuration of a gold card which is a conventional noble metal composite plate.

[Explanation of symbols]

 1,11 Noble metal sheet (gold foil) 2,12 Protective film 10,20 Noble metal composite sheet (gold card) 12a Outer layer 12b Inner layer 13 Coated noble metal sheet 14,15 blade

Claims (5)

[Claims] 1. A noble metal sheet made of a noble metal or an alloy of a noble metal, and a protective film coated on both surfaces of the noble metal sheet, wherein the protective film comprises an inner layer and an outer layer, and the inner layer forms an end of the noble metal sheet. A noble metal composite plate characterized in that a part is covered. 2. The noble metal composite plate according to claim 1, wherein an end of the noble metal thin plate is covered in a bent state. 3. A noble metal sheet made of a noble metal or a noble metal alloy is coated with a protective film to form a coated noble metal sheet, and the amount of separation between the blade surfaces when a pair of opposed cutting blades are engaged with each other is measured. Precious metal sheet thickness of 0.3
The precious metal composite, wherein the coated noble metal sheet is cut into a predetermined shape by engaging the blade, and an end of the noble metal sheet is covered with a protective film. Plate manufacturing method. 4. A noble metal sheet made of a noble metal or an alloy of a noble metal is coated with a protective film to form a coated noble metal sheet. A method for producing a noble metal composite plate, wherein a part is covered. 5. A noble metal sheet made of a noble metal or an alloy of a noble metal is coated with a protective film to form a coated noble metal sheet, and the coated noble metal sheet is cut into a predetermined shape, and the cut surface of the coated noble metal sheet is protected. A method for producing a noble metal composite plate, wherein an end of the noble metal thin plate is coated by applying an organic solvent that dissolves the film.