KR20040098823A - Direct stamping method for hologram - Google Patents

Abstract

PURPOSE: A hologram fabrication method using a direct stamping carve method is provided to directly carve a hologram on a substrate having more than film thickness, thereby remarkably improving productivity and quality without damaging the directly carved hologram. CONSTITUTION: A plastic substrate is prepared. Holography letters or logos are carved on the plastic substrate through a direct stamping carve method(110). A metal layer having a predetermined thickness is formed on a surface of the carved substrate(120). To form a window portion, a printing layer for protecting the metal layer is printed in the rest parts except the window portion(130). The metal layer of the window portion where the printing layer is not formed is removed(140). While removing the metal layer, an oxidize solution is cleaned with water and dried(150). A product is cut and processed(160). The cut and processed product is packed.

Description

Direct stamping method for hologram using stamping direct engraving method

The present invention relates to a method for manufacturing a hologram, and more particularly, stamping to form a hologram by directly imprinting a holographic pattern on a label (or symbol) or a product in which letters, pictures, logos, and various patterns are expressed. It relates to a hologram manufacturing method using a direct engraving method.

In general, holography refers to a technique of reproducing a stereoscopic image by recording an interference pattern of light on a recording medium, and a hologram refers to a photographic film in which two-dimensional or three-dimensional images are recorded using such a holography technique. . Holography uses laser light to reflect and transmit a semi-transparent mirror to separate it into two pieces of light, and then one of the two separate lights produces an object wave that is a reflected wave in the light of the object, which is the reference to the other wave. The hologram is recorded on the film by making waves intersect on the film.

In addition, the hologram film is mostly made of a synthetic resin film having a thickness of about 10 μm to 300 μm, and the hologram image is mainly recorded as an embossing pattern on one surface of the hologram film by laser light. However, these hologram images are usually recorded in Angstrom units (Å = 1x10-10m), so they are clearly reproduced only by special lighting or sunlight lighting by halogen lamps and appear very blurry by general lighting such as incandescent lamps and fluorescent lamps.

Therefore, in recent years, a method of mass-producing hologram film using a hologram stamper (or shim; a kind of metallized hologram mold) has been used. In other words, the hologram stamper is wound on the outer surface of the roller to form a hologram master roll, and then embossed on the metal surface adhered to the plastic film by using the master roll. This is a method of recording a hologram image.

In addition, various types of hologram items are manufactured using such hologram films. In particular, as the quality of products increases, holograms are increasingly applied to labels or stickers that express company names, product names, logos, and emblems. However, as shown in FIG. 1, since the conventional hologram film 3 is made of a very thin plastic film, in order to make a hologram product, the hologram film 3 should be adhered to a transparent plastic substrate 5 having a predetermined thickness. . As a method of bonding, insert film injection (also called in-mold injection) is widely used, and there is a method using an adhesive, but it is not used well because of poor quality. Therefore, when manufacturing a hologram product by a conventional in-mold injection method, a very thin hologram film 3 is first inserted into a mold and heated to a high temperature to inject a liquid resin into the mold at a high pressure. However, during this process, the holographic pattern 9 formed on the hologram film 3 is damaged or the ink melts due to high heat and pressure.

Accordingly, recently, a metal layer is deposited on the transparent substrate, except for the portion where the hologram film is to be attached (for example, a letter portion), and then the embossed hologram film is applied to the portion where the metal layer is not deposited by applying heat and pressure. Stamping (Hot Stamping) is a technique that does not need to cut the hologram film precisely, but the hot stamping method also suffers from a high defect rate. For example, Figure 2 is a perspective view showing a display name plate for a mobile phone manufactured by a conventional hot stamping method, as shown, the transparent portion is processed so that the LCD screen can be seen in the center of the display name plate for mobile phone 10 A window portion 14 is formed, and a mirror surface 13 is formed along an edge thereof, and a character portion 12 in which a product name of a mobile phone is expressed as a hologram character is formed at one upper end of the mirror surface 13. It is. In addition, an embossed hologram film 3 having a predetermined size is attached to the rear surface of the character portion 12 by a hot stamping method.

3 is a process diagram schematically illustrating a manufacturing process of manufacturing a display name plate for a mobile phone according to the prior art. As shown in FIG. 3, a metal layer 18 is formed by vacuum depositing a metal on a hard coated disc 16. Forming (310), silk-printing the print layer (20) on the surface of the metal layer (18) on which the metal is deposited (320), and after the silk printing, the window portion (14) in the metal layer (18). And removing the letter portion 12 (330), and after removing the metal layer 18, washing and drying the window name plate and hot stamping the embossed hologram film 3 on the letter portion 12 of the window name plate. And a machining step 340 for processing into a predetermined form after hot stamping.

However, in the above-described method, the holographic pattern 9 formed on the embossed hologram film 3 is damaged in the process of simply applying heat and pressure to the embossed hologram film 3 to the character portion 12 from which the metal layer 18 is removed. There is still a problem, and the embossed hologram film used here has a weakness that only color is expressed in a single color.

In addition, in order to imprint the hologram on a substrate having a constant thickness (about 300 μm) using a conventional hologram master roll, a very thin substrate such as a film may be used, or UV or solvent curing may be performed on the surface of the substrate on which the hologram is to be imprinted. And a polymer coating layer which can be imprinted is formed. However, in order to form such a polymer coating layer, a complicated manufacturing process and an apparatus are required.

The present invention has been made to solve the above-mentioned problems, the main object of the present invention by directly stamping the hologram using a known hologram master roll on a plastic substrate having a predetermined thickness (about 300㎛ ~ several tens of mm), Up to now, the problem of producing only a very thin hologram film with a thickness of about 300 μm or less, from a very thin plastic film (around 300 μm) to a very thick plastic substrate (a few tens of millimeters), is not limited to thickness. Complex shapes such as holograms and multiple colors can be simultaneously represented in this shape, and a hologram manufacturing method using a direct stamping method for reflecting holograms and transparent holograms according to the hologram expression method is provided.

In addition, the present invention is manufactured by directly imprinting the hologram by applying heat and pressure only to the hologram disc and the plastic substrate using the hologram master roll without using any material such as metal or UV curing agent as a medium on the surface of the plastic substrate on which the hologram is to be expressed. It provides a hologram (reflective hologram, transmission hologram) manufacturing method using a stamping direct stamping method to increase the productivity by simplifying the structure of the process and manufacturing apparatus.

In addition, the present invention is divided into a reflection hologram and a transmission hologram according to the representation method of the hologram stamped on a plastic substrate having a constant thickness (about 300㎛ ~ several tens of mm), in the case of the reflection hologram metal layer and paint layer having good light reflectance It is to provide a hologram manufacturing method using a stamping direct stamping method to improve the reflectivity of the light by forming a better to express the color sense of the hologram.

In addition, the present invention is to provide a manufacturing method for providing a variety of display name plates (mobile phone, DVD Player, TV, etc.) using a stamping direct stamping method.

1 is a schematic exploded perspective view of a hologram manufactured according to the prior art method;

2 is a perspective view of a display name plate for a mobile phone manufactured according to the prior art method;

Figure 3 is a schematic process diagram showing a hologram manufacturing method according to the prior art,

Figure 4a is a schematic process diagram showing an example of a hologram manufacturing method according to the present invention,

Figure 4b is a schematic process diagram showing another embodiment of the hologram manufacturing method according to the present invention,

5 is a flow chart showing another embodiment of a hologram manufacturing method according to the present invention;

6 is a process chart showing a process of manufacturing a display name plate for a mobile phone according to the manufacturing method of the present invention;

7 is a flow chart showing another embodiment of a hologram manufacturing method according to the present invention.

***** Description of the symbols for the main parts of the drawings *****

30: transparent disc 32: hologram portion

14: window portion 41: hologram stamper (Stamper or shim)

42: hologram master roll 44: roller

45: heating means 47: pressurizing means

49: forming holography pattern 50, 50 ': metal layer

60: printed layer for protecting metal layer 70: paint layer

In order to achieve the above object, the hologram manufactured according to the present invention is largely divided into a reflection hologram and a transmission hologram, in the case of the most commonly used reflection hologram on the plastic substrate having a constant thickness (about 300㎛ ~ several tens of mm) The hologram is directly imprinted using a hologram master roll, and a metal layer and a paint layer having a predetermined thickness are formed on a surface where the hologram is imprinted in order to faithfully express the color sense of the hologram.

The substrate according to the present invention should be a synthetic resin (acrylic, PC, PP, PE, ABS, etc.) that is easy to stamp the hologram, and a very smooth surface should be used to express the imprinted hologram clearly.

In addition, a preferred embodiment of the present invention comprises a holographic stamping step of directly stamping a hologram using a hologram master roll on one side of the plastic substrate; A metal layer forming step of forming a metal layer having a predetermined thickness on an entire surface of the substrate on which the hologram is imprinted; The metal layer protective printed layer is formed on the surface which will not be removed to remove the metal layer from the surface of the metal layer formed on the front surface including the hologram-engraved surface and the window surface. A printing step; A metal layer removing step of removing the metal layer of the window portion (or the character portion) which is not printed; Washing with water to remove foreign substances from the hologram portion and the window portion after removing the metal layer; A drying step of drying the washed substrate; Characterized in that the cutting processing step of processing the plastic substrate processed over the previous step in a suitable form according to the name plate shape.

Hereinafter, the name plate of the hologram formed through the preferred embodiment of the present invention and a manufacturing method thereof will be described in detail.

First, FIG. 4A is a schematic process diagram showing an example of a method for manufacturing a single-sided reflective hologram using a stamping direct engraving method according to the present invention, wherein the plastic substrate 30 has a shape of a film (about 300 μm) or more. Regardless of the thickness of several tens of millimeters, a hologram mold (stamper) on which a holographic pattern 49 having a depth of several micrometers to several tens of micrometers is formed is wound around a roller to form a master roll 42, and a predetermined pressure Vi) the holographic pattern 49 formed on the hologram stamper 41 attached to the master roll 42 by passing through the master roll 42 and the roller 44 pressurized up and down by the means 47. It is engraved in (복사: 되도록) to be copied.

On the other hand, the size of the holographic pattern is shown to be exaggerated than the actual size, but in reality compared to the thickness of the plastic substrate 30 is very fine (several to several tens of micrometers), the plastic substrate used at this time is transparent to transmit light well Should be.

Subsequently, a metal layer 50 having a predetermined thickness is formed on the surface of the plastic substrate 30 in which the holographic pattern is engraved. The metal layer 50 increases the reflectance of the light transmitted through the substrate 30 so that the vivid color sense with the hologram is well displayed. The material of the metal layer to be formed is aluminum (Al), nickel (Ni), titanium (Ti), chromium (Cr), gold, silver, and the like, and mirror parts of different textures are expressed according to the metal layer material. The metal layer 50 may be formed by a vacuum deposition method, a hot stamping method, a printing method, or a painting method. The method of forming a metal layer in which the effect of the imprinted hologram is best expressed is best performed by a vacuum deposition method. Ping, printing, painting. Mobile products such as mobile phones and MP3 players are formed with metal layers by evaporation or printing, and indoor appliances such as TVs and DVD players are hot stamped, evaporation and printing are used. It is selected according to the use of the product to be used and according to the use environment, the design and the mechanical configuration. Among the methods of forming the metal layer, in the vacuum deposition method, if the deposition surface is not maintained above a certain surface strength (3H or more: pencil strength), the deposited metal surface is peeled off (peeling). do. In order to maintain the surface strength, coating with a UV-curable coating or a thermosetting coating to around 10㎛, which is commonly called hard coating (hard coating).

On the other hand, a metal layer protective printed layer may be further formed on the metal layer. In this way, by forming the printing layer on the metal layer, not only the metal layer is prevented from being oxidized, but also the light transmitted through the metal layer is blocked to make the hologram appear clearly.

As described above, the hologram manufacturing method using the stamping direct stamping method according to the present invention improves productivity and quality by omitting a process of preparing a hologram film first and attaching or welding the same to a separate plastic substrate as in the previous method.

4B is a schematic process diagram showing an example of a method for manufacturing a double-sided reflective hologram using a stamping direct engraving method according to the present invention. The difference from the cross-sectional reflection hologram in FIG. 4A is that the hologram mold (stamper) on which the holographic pattern 49 is formed is wound around the upper and lower rollers to form a master roll 42, and a predetermined pressure is applied. The holographic pattern 49 formed on the hologram stamper 41 attached to the master roll 42 is engraved on both sides of the plastic substrate by passing through between the two master rolls 42 pressurized by the means 47.陰刻: 凹) to be copied.

Subsequently, metal layers 50 having a predetermined thickness are formed on both surfaces of the plastic substrate 30 in which the holographic pattern is engraved. The metal layer 50 increases the reflectance of light reflected on both surfaces of the substrate 30 so that the vivid color sense of the hologram is well displayed. And the material of the metal layer formed is aluminum (Al), nickel (Ni), titanium (Ti), chromium (Cr), gold, silver and the like. The metal layer 50 may be formed by a vacuum deposition method, a hot stamping method, a printing method, or a painting method. The method of forming a metal layer in which the effect of the imprinted hologram is best expressed is best using a vacuum deposition method. Ping, printing, painting. The method of forming the metal layer is selected depending on the use of the product to be mounted and used with the display name plate, according to the use environment, the design, and the mechanical configuration.

In addition, the plastic substrate 30 on which the holograms are to be imprinted on both sides may be transparent or not transparent, and the surface of the plastic substrate 30 may be smooth, and the hologram is expressed on the non-transparent substrate without forming a metal layer. . In the case of using a transparent plastic substrate, a metal layer (some light is partially transmitted) is formed on both sides so that the hologram is well represented. In this way, the holographic pattern was formed on both sides of the plastic substrate 30 to develop a new type of hologram product. According to the purpose of the product, the metal coating layer of any kind is not formed, thereby reducing the production cost and simplifying the process. There is a characteristic to become.

5 is a schematic process diagram showing another embodiment of a method for manufacturing a hologram using a stamping direct stamping method according to the present invention, as shown, a preparation step of preparing a plastic substrate, and stamping directly on the prepared plastic substrate Stamping step 110 to imprint the letters or logo of the holographic pattern by the stamping method, the metal layer forming step 120 to form a metal layer 50 of a predetermined thickness on the surface of the imprinted substrate, the metal layer to peel off the window to form To this end, a printing step 130 for printing a metal layer protective print layer on the remaining portion except for the window portion, a metal layer removing step 140 for peeling off the metal layer of the window portion in which the metal layer protective print layer is not formed, and making the transparent layer visible, and removing the metal layer. Washing and drying step (150) for washing and drying the oxidizing solution used in water, cutting according to the shape Cutting processing step 160 of high processing, the packaging is made of a packaging step of packaging the processed product in accordance with the standard.

In addition, according to another embodiment of the method for manufacturing a hologram using the stamping direct stamping method according to the present invention, as shown in FIG. 7, the metal layer of the holographic-engraved letter or logo surface 12 is peeled off and fluoresced thereon. Color printing of paint or general paint may be performed to express various background colors based on a predetermined color processed by hologram (paint layer forming step). In other words, when the light is good, the imprinted hologram color is shown first, and in the case of a cloudy day, the logo, product name, and character of the company are effectively represented by the printed color. At this time, the paint layer 70 should be applied as close to the hologram 32 as possible. In addition, the metal layer 50 'may be formed of a metal different from the metal layer 50 coated on the mirror surface instead of the paint layer 70. (Metal layer forming step)

On the other hand, Figure 6 is an embodiment showing a method of manufacturing a display name plate for a mobile phone using a stamping direct stamping method according to the present invention.

<Preparation stage>

First, a transparent plastic substrate 30 of 0.5 mm to 1 mm is prepared (a). The substrate 30 may be a transparent plastic plate such as acrylic, PC, PP, PE, ABS, or the like. In this case, the substrate 30 is not formed with any kind of metal coating layer. In addition, the substrate 30 is large enough to produce a large number of display name plates for mobile phones.

<Hologram Stamping Step>

And the hologram is engraved while the substrate 30 passes between the hologram master roll 44 and the roller 42 mounted thereon (b). At this time, a hologram stamper 41 in which a molding hologram is expressed is attached to the outer circumferential surface of the hologram master roll 42. The hologram stamper 41 is made of a metal or an alloy thereof having excellent heat resistance and durability, such as nickel and chromium. In addition, a predetermined heating means 45 is installed inside the hologram master roll 42 to heat the hologram stamper 41 to a predetermined temperature. For example, it heats about 80-300 degreeC according to the kind of board | substrate. The direct engraving method according to the present invention is to be imprinted by the pressure and heat of the holographic master roll. Therefore, the hologram master roll 42 is provided with a predetermined pressing means 47. Here, since the heating means 45 and the pressurizing means 47 are easily applicable to those skilled in the art, detailed description thereof will be omitted.

<Metal layer formation stage>

Subsequently, a metal layer 50 having a predetermined thickness is formed on the substrate 30 having the hologram engraved therein (c). The metal layer 50 forms a printing surface of the display name plate for a mobile phone. As a technique for forming the metal layer 50, a vacuum deposition method is used. That is, the substrate 30 is placed in a vacuum chamber in a vacuum state, and the material to be deposited, for example, aluminum, nickel, titanium, chromium, gold, silver, and the like is evaporated to be deposited on the substrate. However, since the method of forming the metal layer is not limited to the vacuum deposition method, other methods such as a hot stamping method, a printing method, a painting method, and the like may be applied.

<Printing Step>

Removing the metal layer of the surface constituting the window portion 14 and / or the hologram-engraved character portion 12 from the metal layer formed on the whole including the hologram portion 32 and the other window portion 14 in which the hologram is imprinted. In order to form the metal layer protective printed layer 60 on the surface which will not be removed in order to print (d).

<Metal layer removal step>

Then, the metal layer 50 formed in the window portion 14 and / or character portion 12 is removed (e). The method of removing the metal layer 50 can be largely divided into two methods according to the technique. First, a method of using a water-soluble resin coating layer is laminated to a water-soluble resin coating layer on the desired portion of the metal layer, and a vacuum deposition layer of aluminum or chromium is laminated thereon, and then the water-soluble coating layer is washed with water in the removal process. The second method is to use a corrosion protection layer to place a corrosion protection layer on the part to leave the metal layer, and then to rust the metal of the corrosion protection layer in the acid or alkali aqueous solution, and then clean it with water. Therefore, there is a difference in the manufacturing process according to the technique, but in the present invention will be described by a method using a corrosion protection layer. However, the scope of the present invention includes not only a method of using a water-soluble resin coating layer but also a method of using a corrosion preventing layer. When the metal layer 50 is removed using the method described above, the window portion 14 and / or the character portion 12 become transparent again.

<Washing and drying stage>

In the step of removing the metal layer, the remaining foreign matter (aqueous resin or oxidant) should be washed with water, and then dried to completely remove moisture. If the metal layer on the letters or logos imprinted with the hologram has not been removed, this step goes to the cutting process.

<Paint layer forming step>

Subsequently, the coating layer 70 is formed on the letters or logos imprinted with the hologram which is again transparent through the metal layer removing step (f). The paint layer 70 may also form a metal layer 50 'made of metal (Al, Ni, gold, silver, etc.) different from the metal coated on the mirror surface formed by vacuum deposition described above. At this time, the hot stamping method is mainly used for forming the metal layer. On the other hand, the paint layer 70 can be printed in a fluorescent paint or a unique color required by the printing method, so that the hologram can be expressed in a specific color of the logo or characters even in a light or low environment (cloudy weather or indoors).

<Cutting Processing Step>

Since a plurality of display name plates are formed on one disc, each product is cut and processed to fit the size and shape (g).

Therefore, in the center of the display name plate 10 for a mobile phone manufactured according to the present invention, a transparent window portion 14 is formed so that the LCD screen can be seen, and a mirror surface 13 is formed along the edge thereof. The upper surface of one side of the mirror surface 13 is formed with a letter or logo imprinted directly on the hologram, and if necessary, a paint layer of a specific color may be printed on the back of the letter or logo.

As described above, the hologram manufacturing method using the stamping direct stamping method according to the invention is not particularly limited to the thickness or type of the substrate on which the hologram is formed. For example, it is possible to express holograms by imprinting directly on a very thick plastic substrate, a metal (aluminum or an alloy thereof, ie a soft metal) or a glass surface. However, if the surface is hard, such as metal or glass will require a higher heating temperature and pressure than the plastic substrate. When the hologram is formed on the surface of the metal, the hologram may be plated in a color required by the heating vacuum deposition method, the sputtering method, or the ion plate method.

As described above, the hologram manufacturing method using the stamping direct stamping method according to the present invention can not only directly improve the productivity but also directly improve the productivity because the hologram can be directly imprinted on a substrate having a thickness of about 300 μm or more. Since the imprinted hologram is not easily damaged, the quality is improved.

In addition, since the present invention directly stamps the hologram using the hologram master roll, a complicated process such as cutting and bonding of the hologram film is omitted, thereby simplifying the manufacturing process and the manufacturing apparatus.

The present invention also provides a specific color to the hologram by forming a paint layer on the hologram represented on the substrate, thereby compensating for the weakness that the hologram could not express colors when the amount of light is low (in cloudy weather or indoors). It has the effect of expressing the logo.

The present invention can also easily express the hologram regardless of the thickness or type of the substrate, and can also be displayed on both sides of the substrate at the same time has the effect of producing a variety of hologram products.

Claims (8)

The hologram is directly stamped on a transparent substrate having a thickness of about 300 μm or more using a known hologram master roll, and then formed by plating a metal layer having a predetermined thickness on the substrate surface on which the hologram is expressed. Hologram manufacturing method using stamping direct engraving method. The method of claim 1, The metal layer plated with a predetermined thickness is peeled off and the paint layer of the hologram is stamped on the hologram, and the paint layer of various colors is formed to express the characteristics of the hologram and the effect of the printed color according to the amount of light. Hologram manufacturing method using a stamping direct stamping method characterized in that. The method according to claim 1 or 2, The metal layer is a hologram manufacturing method using a stamping direct stamping method, characterized in that the plating of a metal selected from aluminum, nickel, titanium, chromium, gold, silver and the like. The method of claim 1, Hologram manufacturing method using a stamping direct stamping method characterized in that the holographic pattern is formed on each side of the transparent substrate. The method of claim 1, Holographic manufacturing method using a stamping direct stamping method, characterized in that the printing layer for protecting the metal layer is printed on the metal layer. A hologram stamping step of directly stamping the hologram using a known hologram master roll on one side of the transparent substrate having a predetermined thickness; A metal layer forming step of vacuum depositing a metal layer having a predetermined thickness on a surface of the substrate on which the hologram is imprinted; A printing step of peeling off the metal layer to form a window part and making the transparent part to print the metal layer protective layer for protecting the remaining part except for the window part (which may include letters or logos, if necessary); A metal layer removing step of removing the unprotected metal layer (which may include a window part and a letter or logo, if necessary) after the printing and making it transparent; A washing step of removing the metal layer and washing the foreign substances used for removal with water; A drying step of completely drying the moisture remaining on the washed substrate; Holographic manufacturing method using a stamping direct stamping method comprising a cutting step of cutting and processing the substrate imprinted with the hologram to a suitable size and shape. The method of claim 6, The method further includes a paint layer forming step of effectively expressing letters or logos by utilizing holographic characteristics and printed color characteristics by printing the holograms in which the metal layers have been removed through the printing step and the metal layer removing step with various colors. Hologram manufacturing method using a stamping direct stamping method characterized in that. The method of claim 7, wherein And a metal layer forming step of forming a metal layer using a different type of metal and a metal layer forming a mirror surface instead of the coating layer forming step.