Pressed product having pattern

Abstract

The present invention relates to a patterned embossed product comprising a shaped portion and a background portion, wherein the shaped portion includes an uneven surface and the background portion is formed around at least a portion of the perimeter of the shaped portion, and one or more grooves and / or holes are formed in the embossed product, and the embossed product is manufactured by pressure molding metal powder. The high degree of shape freedom allows for the inclusion of patterns of various shapes, and various anti-counterfeiting means can be provided to effectively guarantee the authenticity of the embossed product.

Description

Technology Field

[0001] The present invention relates to an embossed product having a pattern, and more specifically, to an embossed product having a pattern having a high degree of shape freedom and equipped with anti-counterfeiting means. Background Technology

[0002] Deep-deep embossing products are embossed products with a high depth of surface pattern, meaning the surface pattern is formed with great depth. Currently, deep-deep embossing products are manufactured by creating a blank using sintering or injection molding processes for powder materials, or casting processes for molten materials, and then immediately press-forming this blank using a mold engraved with the shape of the product.

[0003] However, embossed products produced by this method face difficulties in correctly transferring the mold pattern under appropriate press conditions, and there are clear limitations in expressing glossy or matte surfaces. In particular, when undergoing an injection molding process, defects may occur in which impurities other than the powder material used (such as organic matter) are incorporated into the embossed product.

[0004] In addition, since existing deep embossed products are manufactured by press forming a mold using a public mold, there was a problem of limited surface pattern diversity and low degree of shape freedom, as only limited shapes and depths of patterns could be formed. Prior art literature

[0005] Registered Patent No. 10-2440979 (Registered September 1, 2022) The problem to be solved

[0006] The present invention aims to provide an embossed product having a pattern with a high degree of shape freedom and equipped with anti-counterfeiting means. means of solving the problem

[0007] An embodiment of the present invention for achieving the above-described purpose relates to a patterned embossed product comprising a shaped portion and a background portion, wherein the shaped portion comprises an uneven surface and the background portion is formed around at least a portion of the perimeter of the shaped portion, and one or more grooves and / or holes are formed in the embossed product, and the embossed product is manufactured by pressure molding metal powder.

[0008] One or more background security elements among characters, patterns, and designs may be formed in the above background area.

[0009] The wall surface constituting the above groove and / or hole is formed as a straight line or a curve, and the angle between the wall surface and the floor surface may be 10 to 170˚.

[0010] One or more wall security elements among characters, patterns, and designs may be formed on the wall surface constituting the above-mentioned home and / or hole.

[0011] The surface of the above-mentioned embossed product may include a magnetic security material.

[0012] The metal powder may comprise 72 to 85 wt% of metal powder with a particle size of 0.5 to 38 μm, 6 to 13 wt% of metal powder with a particle size of 38 to 63 μm, 8 to 16 wt% of metal powder with a particle size of 63 to 125 μm, and 0 to 14 wt% of metal powder with a particle size of 125 to 200 μm.

[0013] The above-mentioned stamped product may be manufactured through the following steps: a raw material input step of feeding metal powder into a press machine equipped with a mold set; a molding step of press-molding the metal powder to produce a compression molded body; a sintering step of sintering the compression molded body to produce a sintered body; and a finishing step of polishing at least a portion of the surface of the sintered body to produce a stamped product.

[0014] The above press forming can be performed once. Effects of the invention

[0015] The embossed product having the pattern of the present invention has a high degree of shape freedom and can include patterns of various shapes.

[0016] In addition, by providing anti-counterfeiting measures, the authenticity of the embossed product can be verified. Brief explanation of the drawing

[0017] FIG. 1 illustrates an embodiment of a stamped product having a pattern of the present invention. FIGS. 2(A) to 2(D) illustrate examples of the entrance shapes of the groove and hole. FIGS. 3(A) to FIGS. 3(C) illustrate examples of groove and hole shapes. FIG. 4 illustrates an example of a stamped product having the pattern of the present invention. FIGS. 5(A) to FIGS. 5(C) are photographs showing the appearance of a mold and a stamped product. Figure 6 is a photograph of a hologram of an embossed product. Figure 7 is a photograph showing the appearance of the embossed product according to the particle size of the metal powder. Specific details for implementing the invention

[0018] Before describing the preferred embodiments of the present invention in detail below, it should be noted that the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0019] Throughout this specification, when a part is described as “comprising” a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0020] Unless the context clearly indicates a specific order, each step may be performed differently from the specified order. That is, each step may be performed in the same order as specified, substantially simultaneously, or in the reverse order.

[0021] Hereinafter, embodiments of the present invention are examined. However, the scope of the present invention is not limited to the following preferred embodiments, and a person skilled in the art to which the present invention pertains may implement various modified forms from the contents described in the specification.

[0022] The present invention relates to an embossed product having a pattern. The embossed product having a pattern according to the present invention has a high degree of shape freedom and can be implemented in various forms and may include various types of patterns. It is equipped with an anti-counterfeiting means to effectively guarantee the authenticity of the embossed product.

[0023] FIG. 1 illustrates an embodiment of a patterned product (10) according to the present invention. The patterned product (10) according to the embodiment comprises a shape portion (100) and a background portion (200), wherein the shape portion (100) includes an uneven surface and the background portion (200) is formed around at least a portion of the shape portion (100), and one or more grooves (300) and / or holes (400) are formed in the patterned product (10), and the patterned product (10) is manufactured by pressure molding metal powder.

[0024] The above-mentioned embossed product (10) is made of metal and is an article formed by undergoing a press process to create a shape portion (100) containing an uneven surface and a background portion (200), and includes various types of coins, medals, souvenirs, etc. The metals that can be used for the embossed product (10) may include gold, silver, copper, platinum, palladium, or alloys of the above materials, but are not limited thereto. If the embossed product (10) is made only of metal, it may contain unavoidable impurities, and the metal content (purity) of the embossed product (10) may be 99% or more, 99.5% or more, or 99.9% or more. The embossed product (10) does not contain organic matter, and if it contains an unavoidable level of organic matter, the organic matter content may be less than 0.1%, less than 0.01%, or less than 0.001%.

[0025] The above-mentioned shape portion (100) is a phase including an uneven shape, and the uneven shape includes various shapes expressed as unevenness. Although the drawing shows the uneven shape as a protruding shape protruding from the background portion (200), it may also be a recessed shape recessed from the background portion (200), and an uneven shape including both a protruding shape and a recessed shape may be provided in a single embossed product (10).

[0026] Here, the form may be a design element such as a person, animal, plant, object, building, or nature, or it may be a number, letter, pattern, or design. One or more reliefs may be provided, and each relief may embody a single form, or multiple reliefs may be combined to embody a single form.

[0027] The height or depth of the above uneven surface can be implemented as 500 to 10,000 μm.

[0028] The position of the above-mentioned shaped part (100) is not particularly limited and may be located at the center of the embossed product (10), or at a peripheral part other than the center.

[0029] The background portion (200) is formed around at least a portion of the perimeter of the shape portion (100) and can be formed as a flat surface or a free curved surface. The overall thickness of the background portion (200) may be formed uniformly or may be formed to have an asymmetric thickness over the entire embossed product (10). In the case of having an asymmetric thickness, the thickness of the thinnest region may be 100 μm, and the ratio of the thickness of the thickest region to the thinnest region may be up to 1,000:1.

[0030] The background portion (200) can be implemented in a glossy, matte, or a combination of glossy and matte forms, and in this case, the structure or roughness of the surface is not particularly limited.

[0031] One or more background security elements (210) among characters, patterns and designs may be formed in the background portion (200), and the minimum width (resolution) of the background security elements (210) may be 0.1㎛, and the depth of the background security elements (210) may be 100 to 400㎛.

[0032] In order to implement various shapes on the surface of the embossed product (10) and further enhance security, at least one groove (300) and / or hole (400) may be provided. Although the following description is based on the groove (300), the same description may apply to the hole (400). Here, the groove (300) has a bottom surface, and the hole (400) does not have a bottom surface as it is a structure that penetrates the embossed product (10); however, for convenience, the bottom surface of the hole (400) is defined here as an exit located opposite the entrance (310).

[0033] The entrance (310) and bottom surface (320) of the above-mentioned home (300) may independently be shapes formed of a circle, a polygon, or a free curve, and examples of the shapes of the entrance (310) and bottom surface (320) are illustrated in FIGS. 2(A) to FIGS. 2(D).

[0034] The size of the entrance (310) and the bottom surface (320) of the groove (300) may be the same, or they may be formed differently. The wall surface (330) constituting the groove (300) may be formed as a straight line or a curve, and the angle between the wall surface (330) and the bottom surface (320) may be formed to be 10 to 170°. When applying a general method for manufacturing embossed products, that is, a method of making a metal ball and then pressing it with a mold to form a pattern containing a groove, it was impossible to form the angle between the wall surface and the bottom surface to be less than 90°. However, by applying a method of press molding metal powder as in the present invention, the angle between the wall surface (330) and the bottom surface (320) can be formed to be less than 90° and up to at least 10°, thereby significantly improving the degree of freedom of the shape of the groove (300).

[0035] As an example of the shape of the groove (300), the entrance (310) and the bottom surface (320) of a groove (300) are formed with shapes of the same size and shape, and the wall surface (330) and the bottom surface (320) constituting the groove (300) are arranged at right angles to each other, so that a groove (300) with a rectangular cross-section can be realized (Fig. 3(A)). As another example, the entrance (310) and the bottom surface (320) of a groove (300) are formed with shapes of the same shape but different sizes, and the wall surface (330) constituting the groove (300) is arranged at an angle rather than at right angles to the bottom surface (320), so that a groove (300) with a trapezoidal cross-section can be realized (Figs. 3(B), 3(C)). Such shapes of the groove (300) are exemplary, and the shape of the groove (300) is not limited to the examples described above.

[0036] One or more wall security elements (500) among characters, patterns, and designs may be formed on the wall surface (330) constituting the above groove (300). An embossed product (10) having a wall security element (500) formed thereon is illustrated in FIG. 4. The wall security element (500) may have an uneven shape with a depth (d) of 1 to 200 μm. Since this wall security element (500) is formed inside the groove (300) and is very fine and not easily observed from the outside, the security of the embossed product (10) can be significantly improved.

[0037] The description above regarding the shape of the groove (300) or the wall security element (500) formed on the wall surface (330) of the groove (300) applies equally to the hole (400), and in the case of the hole (400), the floor surface (320) refers to an exit located opposite the entrance (310).

[0038] Meanwhile, the embossed product (10) may include a magnetic security material to further enhance security. It is preferable that such a magnetic security material be located on the surface of the embossed product (10), because if the magnetic security material is located inside the embossed product (10), problems may arise during the manufacturing process of the embossed product (10) and problems such as a decrease in the detection sensitivity of the magnetic security material may occur.

[0039] To explain more specifically, during the process of manufacturing the embossed product (10), the magnetic security material acts as an impurity, making it difficult to form the embossed product (10), and even if the embossed product (10) is formed, it may cause problems such as difficulty in forming the embossed product (10) in the desired shape, and the magnetic expression strength of the magnetic security material may decrease due to the main metal powder constituting the embossed product (10), which may cause problems such as a decrease in detection sensitivity caused by the magnetic security material.

[0040] Therefore, to prevent such problems, it is desirable that most of the magnetic security material be located mainly on the surface of the embossed product (10), and this arrangement form and structure can be achieved by first introducing the magnetic security material into the mold during the manufacturing process of the embossed product (10), then introducing the main metal powder, and then pressurizing the mold.

[0041] The above metal powder may include metal powder with a particle size of 0.5 to 200 μm. Here, the expression "metal powder with a particle size range of 0.5 to 200 μm" refers to particles of a size that do not pass through a 0.5 μm sieve but pass through a 200 μm sieve 100%.

[0042] The metal powder used to manufacture the preferred pressed product (10) of the present invention preferably comprises 72 to 85 wt% of metal powder with a particle size of 0.5 to 38 μm, 6 to 13 wt% of metal powder with a particle size of 38 to 63 μm, 8 to 16 wt% of metal powder with a particle size of 63 to 125 μm, and 0 to 14 wt% of metal powder with a particle size of 125 to 200 μm. When using metal powder having such a particle size distribution, small particles penetrate into the voids between large particles, forming high density and cohesive force, so it is possible to manufacture a pressed product (10) that maintains a specific shape even when pressurized with a relatively small force (about 10 to 50 tons). In addition, it is possible to manufacture a product that maintains its shape with only one pressurization process, thereby reducing process time and costs. Furthermore, it is possible to prevent pattern wear of the shape part (100), security element, groove (300), hole (400), etc. caused by repeated pressurization, enabling the formation of a pattern with higher resolution and a clearer shape. Additionally, it has the advantage of slowing down the rate of pattern wear of the mold caused by repeated pressurization, thereby increasing the number of times the mold can be used.

[0043] In addition, since it has appropriate flowability, it is possible to manufacture a stamped product (10) with a uniform density overall, thereby improving the durability and strength of the stamped product (10).

[0044] Among the metal powders, metal powders with relatively small particle sizes, such as metal powders with a particle size of 0.5 to 38 μm and metal powders with a particle size of 38 to 63 μm, are added to improve cohesion and density. If the content is insufficient, there is a problem that it is difficult to manufacture a pressed product (10) that maintains a specific shape due to insufficient cohesion. If the content of these small particle metal powders is excessively high, clumping occurs due to aggregation between powder particles, and since a large density gradient is formed within the pressed product (10) due to this clumping, the shrinkage rate and expansion rate differ depending on the location during heat treatment in the sintering stage, so problems such as the final product warping, breaking, or deviating from the target specifications may occur.

[0045] Conversely, among metal powders, relatively large particle sizes such as metal powders with a particle size of 63 to 125 μm and metal powders with a particle size of 125 to 200 μm are added to improve flowability and strength. If the content is insufficient, problems such as reduced flowability and deterioration of product quality due to density gradients may occur, and conversely, if the content is high, problems such as difficulty in manufacturing a pressure-molded body due to insufficient cohesion may occur.

[0046] To prevent these problems and to improve the resolution of the pattern while manufacturing a stamped product (10) of uniform density, it is preferable to include powder of the particle size described above within the weight range described above.

[0047] As previously explained, the above-described pressed product (10) can be manufactured by press molding metal powder, specifically through a raw material input step of introducing metal powder into a press machine equipped with a mold set; a molding step of press molding the metal powder to produce a compression molded body; a sintering step of sintering the compression molded body to produce a sintered body; and a finishing step of polishing at least a portion of the surface of the sintered body to produce the pressed product (10).

[0048] The above raw material input step is a step of inputting metal powder into a press machine equipped with a mold set. The mold set can be configured in various ways depending on the shape of the stamped product (10), and the metal powder may be the metal powder described above. If a magnetic security element is applied to the stamped product (10), the magnetic security element can be input into the mold first, and then the metal powder can be input to prepare it.

[0049] The above molding step is a step of manufacturing a compression molded body by press molding metal powder. Unlike the general method of manufacturing a pressed product (10) of a desired shape by repeatedly applying pressure with a pressure of 50 to 150 tons during metal powder pressure molding, the present invention has the advantage of being able to manufacture a pressed product (10) with a pattern formed with sufficient density, cohesiveness, and high resolution by using metal powder having the particle size distribution described above and performing press molding once with a relatively low pressure of 10 to 50 tons during pressure molding. As a result of applying a low load and omitting repeated pressure, effects such as improved mold life, prevention of damage to the pattern of the pressed product (10), and reduction of process time and cost can be obtained.

[0050] The above sintering step is a step of manufacturing a sintered body by sintering the above compression molded body, and the sintering can be performed in a vacuum or argon (Ar) atmosphere, and can be performed in the order of raising the temperature to 70~75% of the melting point of the metal powder, maintaining it for 1~2 hours, and cooling it down to 100℃ or lower.

[0051] The above finishing step is a step of manufacturing a stamped product (10) by polishing at least a portion of the surface of the sintered body. For example, barrel polishing or magnetic polishing methods may be applied, and other polishing methods may also be applied. Through this polishing process, a surface having a glossy and / or matte finish can be formed.

[0052] Hereinafter, the specific operation and effects of the present invention will be explained through an embodiment of the present invention. However, this is presented as a preferred example of the present invention, and the scope of the rights of the present invention is not limited according to the embodiment.

[0054] [Preparation Example]

[0055] Example Preparation

[0056] Silver powder containing 74.5 wt% of metal powder with a particle size of 0.5 to 38 μm, 7.6 wt% of metal powder with a particle size of 38 to 63 μm, 10.4 wt% of metal powder with a particle size of 63 to 125 μm, and 7.5 wt% of metal powder with a particle size of 125 to 200 μm was prepared, and then placed into a mold having a holographic pattern formed on a scale of several hundred nanometers, and then pressure-molded with a load of 12 tons. The pressure-molded body was heated at 750°C for 1.5 hours in a furnace under an argon atmosphere, and then the heat source was removed and the body was slowly cooled to produce the embossed product of the example.

[0057] Comparative Example 1 Manufacturing

[0058] A silver shard (99.9% Ag) with a diameter of 39.8 mm and a weight of 31.1 g was prepared, and the embossed product of Comparative Example 1 was manufactured by repeatedly pressurizing it four times with a load of 140 tons.

[0060] [Experimental Example 1]

[0061] The mold, the embossed product of the example, and the embossed product of Comparative Example 1 are shown in FIG. 5(A), 5(B), and 5(C), respectively.

[0062] Referring to FIGS. 5(A), 5(B), and 5(C), it was confirmed that when the embossed products of Example and Comparative Example 1 were manufactured using a mold of the same shape, embossed products having the same pattern transfer state were formed. This suggests that, unlike Comparative Example 1, which requires high load and repeated pressing conditions for the manufacture of embossed products, the Example produces a molded body that maintains its shape with only one pressing at a low load.

[0063] Therefore, it was found that it is desirable to use metal powders with four different particle sizes, classified into 0.5–38㎛, 38–63㎛, 63–125㎛, and 125–200㎛, so that the shape of the molded body can be maintained with only one pressurization and a low load.

[0065] [Experimental Example 2]

[0066] Several examples of the example and comparative example 1 were manufactured, and the hologram patterns on the surface of the embossed products were photographed when the mold was used once (pressure applied once) and when the mold was used multiple times (pressure applied multiple times), respectively, and are shown in FIG. 6. In the case of the example, after manufacturing 100 embossed products, the appearance of the first and 100th embossed products was photographed, and in the case of comparative example 1, after manufacturing 10 embossed products, the appearance of the first and 10th embossed products was photographed.

[0067] In the example, pressure was applied using a mold a total of 100 times, and in Comparative Example 1, pressure was applied using a mold a total of 40 times. Referring to FIG. 2, it was confirmed that a hologram pattern appeared on the first embossed product produced in both the example and Comparative Example 1. When applied multiple times, the hologram pattern was confirmed in the example even on the 100th embossed product. On the other hand, in Comparative Example 1, it was found that the hologram pattern of the mold was damaged due to wear of the mold pattern caused by repeated pressure, and thus the hologram pattern was not transferred to the embossed product.

[0068] In other words, unlike Comparative Example 1, the embodiment can manufacture a stamped product with only one pressurization at a low load, so there is less mold damage during product production. Unlike the prior art, it is possible to produce about twice as many products with a single mold, and accordingly, high productivity can be secured, process time can be shortened, and process costs can be reduced.

[0070] [Experimental Example 3]

[0071] A stamped product was manufactured in the same manner as in the example, but with the weight of the silver powder, the raw material, varied according to particle size as shown in Table 1. The appearance of each manufactured stamped product was photographed and is shown in Fig. 7. For the example and Comparative Example 2, the pattern diameter was measured and the diameters were listed together in Table 1. The pattern diameter was listed in the form of "mean ± standard deviation." The standard deviation was the standard deviation according to position, and the diameter was measured 10 times at 18˚ intervals while moving from the 12 o'clock direction (assuming the 12 o'clock direction was 0˚) to derive the standard deviation of the measured values.

[0072] Particle size distribution (㎛) Diameter (mm) 0.5-38 38-63 63-125 125-200 ＞ 200 Examples 74.44% 7.60% 10.46% 7.50% - 55±0.019 Comparative Example 2 89.40% 10.60% - - - 55±0.120 Comparative Example 3 64.39% 6.57% 9.04% 20.00% - - Comparative Example 4 76.45% 7.81% 10.74% - 5.00% -

[0073] As a result of the experiment, first, in the case of Comparative Example 3, the cohesive force was insufficient so a molded body could not be produced, and in Comparative Example 4, large particles of 200 μm or larger protruded from the surface, forming an uneven appearance. Both the Example and Comparative Example 2 produced molded bodies and showed a good appearance when observed visually; however, when measuring the pattern diameter, the standard deviation of the Example was 0.019 mm, whereas the standard deviation of the pattern diameter of Comparative Example 2 was found to be more than 6 times that of the Example, confirming that the pattern uniformity of the Example was significantly superior.

[0074] Therefore, through this experiment, it was confirmed that it is desirable to use metal particles with particle size distributions of 0.5–38 µm, 38–63 µm, 63–125 µm, and 125–200 µm.

[0075] The present invention is not limited to the specific embodiments and descriptions described above, and various modifications can be made by anyone with ordinary knowledge in the technical field to which the invention pertains without departing from the essence of the invention as claimed in the claims, and such modifications fall within the scope of protection of the present invention. Explanation of the symbols

[0076] 10: Embossed product 100: Shaped part 200: Background Section 210: Background Section Security Elements 300: Home 310: Entrance 320: Floor surface 330: Wall surface 400: Hall 500: Wall security element

Claims

Claim 1 An embossed product comprising a shaped portion and a background portion, wherein the shaped portion comprises an uneven surface and the background portion is formed around at least a portion of the perimeter of the shaped portion, and the embossed product has one or more grooves and / or holes formed therein, and the embossed product is manufactured by pressure molding metal powder, and the particle size distribution of the metal powder is 72-85 wt% of 0.5-38 µm, 6-13 wt% of 38-63 µm, 8-16 wt% of 63-125 µm, and 0-14 wt% of 125-200 µm, and the wall surface of the groove and / or hole is formed as a straight line or a curve, and the angle between the wall surface and the bottom surface is 10-170˚, and the wall surface constituting the groove and / or hole has one or more wall security elements among characters, patterns, and designs formed thereon. Claim 2 An embossed product having a pattern, characterized in that, in claim 1, one or more background security elements among characters, patterns, and designs are formed in the background portion. Claim 3 A patterned embossed product according to claim 1, characterized in that a magnetic security material is located on the surface of the embossed product. Claim 4 The pressed product having a pattern according to claim 1, wherein the pressure molding comprises: a raw material input step of inputting metal powder into a press machine mounted on a mold set; a molding step of press-molding the metal powder to produce a compression molded body; a sintering step of sintering the compression molded body to produce a sintered body; and a finishing step of polishing at least a portion of the surface of the sintered body to produce a pressed product; wherein the press molding in the molding step is performed once with a pressure of 10 to 50 tons. Claim 5 A method for manufacturing a patterned embossed product comprising: a raw material input step of inputting metal powder into a press machine mounted on a mold set; a molding step of press-molding the metal powder to produce a compression molded body; a sintering step of sintering the compression molded body to produce a sintered body; and a finishing step of polishing at least a portion of the surface of the sintered body to produce an embossed product; wherein the particle size distribution of the metal powder is 72~85 wt% of 0.5~38㎛, 6~13 wt% of 38~63㎛, 8~16 wt% of 63~125㎛, and 0~14 wt% of 125~200㎛, and in the molding step, press-molding is performed once with a pressure of 10~50 tons, and the embossed product includes a shape portion and a background portion, wherein the shape portion includes an uneven surface, the background portion is formed around at least a portion of the shape portion, and one or more grooves and / or holes are formed in the embossed product. Claim 6 A method for manufacturing a patterned embossed product according to claim 5, wherein, in the raw material input step, a magnetic security material is input into a press machine, and then metal powder is input. Claim 7 A method for manufacturing a patterned embossed product according to claim 5, wherein, in the molding step, one or more background security elements among characters, patterns, and designs are formed on the background. Claim 8 A method for manufacturing a patterned embossed product according to claim 5, wherein, in the molding step, the wall surface of the groove and / or hole is formed as a straight line or a curve, the angle between the wall surface of the groove and / or hole and the bottom surface is 10 to 170°, and one or more wall security elements among characters, patterns and designs are formed on the wall surface of the groove and / or hole.

Images