KR20210045717A - Metallic Paper Expressing such as Feeling of Liquid Metal and Printing Method thereof - Google Patents

Abstract

The present invention relates to a method for printing a metallic paper expressing a sensation of a liquid metal. In a metallic paper processed by a cold foil stamping method for integrally stacking a stencil paper and a metal foil by interposing an adhesive at a position where the metal foil is to be transferred to the stencil paper from a foil, a method for manufacturing a foil is performed at room temperature, and is performed by having a synthetic resin film (PET Film), a thermoplastic resin composition, and metal powder as a main raw material. The method of the present invention comprises: a first step of manufacturing a thin synthetic resin film (a); a second step of forming a thermoplastic resin layer (b) by applying a thermoplastic resin composition made of a transparent material, and having a particle size of about 1,600 to 3,500 Å to a surface of the synthetic resin film (a); and a third step of performing vacuum-deposition for metal powder on the thermoplastic resin layer (b) to form a metal powder layer (c). The metal power layer can be transferred by an adhesive having only the metal powder applied on a stencil paper.

Description

TECHNICAL FIELD [Metallic Paper Expressing such as Feeling of Liquid Metal and Printing Method thereof]

The present invention is a printing method of metallic paper that expresses the feeling of liquid metal related to the surface processing of paper, and without a separate operation such as foil or spot color printing during offset printing, foil transfer processing and color are performed in a single printing processing process. By carrying out the printing work together, not only can you achieve low-cost and high-efficiency printing, but you can also express the texture of a glossy metal material with color on the surface of the foil-processed paper sheet, and create a feeling like foil processing. While giving, it can express various colors and various designs at the same time, and the processed surface gloss changes the texture and color of the surface according to the intensity or angle of light and the viewer's gaze, giving a feeling of flowing water. It relates to a method of printing metallic paper that expresses the feeling of

As a method of expressing metallic luster in various prints, it is a foil fabric that has a metallic texture such as gold or silver when printing patterns or images expressed on the surface of prints, especially paper or plastic materials. Using a stamping printing technique that can express a metallic effect is used.

In the conventional stamping printing method, as one of the methods of transferring metal foil onto the surface of a printing substrate, a hot foil stamping method has been mainly used. This method is a form in which printing and foiling are performed separately. After the printing work is finished, it consists of two steps: foil work on the printed material as a separate post-processing work.

In a typical hot foil stamping method, when transferring the metal foil to a printed product, a metal foil coated with a hot melt adhesive is used, and the metal foil is transferred to the printed product through a process of heating and pressing with a mold.

That is, in the conventional hot foil stamping method, as shown in Fig. 1, in order to perform a foil work, which is one of the post-processing work on the printed material after the main printing work, a copper plate is produced in the shape of the image on which the foil is covered, and installed on the die. , It is made in the form of a work in which the printed material passing through the copper plate is integrally coated with a foil by heat and pressure.

When a foil is placed on a printed object (e.g., a cover), and a graphic or letter plate engraved in a mold (copper plate) is applied with heat and pressure on it, the foil is integrally attached to the upper surface of the print and the graphic or letter shape is displayed on the object. , At this time, the uneven frame is put underneath, and the foil is stamped with a convex shape by pressing on the printed material to which the foil is attached.

like this Since the hot foil stamping method consists of two steps, printing is inconvenient and inefficient. Let's look at this in detail.

Basically, this method is in a form in which the printed material passes through the die on which the copper plate is installed, and a film on which metal powder is laminated is supplied to coat the foil by heat and pressure, so press marks inevitably appear on the printed material. It became a factor that lowered the completeness.

In addition, it can be applied only when the shape of the foil-clad design is attached at the same position in one and the same shape, and when the colors are different, it is necessary to replace the foil suitable for the corresponding color.

In addition, when the design forms to coat the foil are different, it is necessary to separately manufacture a copper plate corresponding to the foil. In other words, if the design is composed of a plurality of designs with different positions or a multi-color design with different colors, the corresponding copper plates must be manufactured, and also replaced by copper plates or replaced with foils suitable for the corresponding color. There is a need for work to be done.

Accordingly, the number of processing processes of the foil varies depending on the shape and color of the design, and the process is cumbersome and inconvenient because it is cumbersome and inconvenient, and it takes a lot of time and cost, resulting in poor productivity and high cost. It has an inefficient problem because it has a cost-effective work type.

In order to solve the problem of the hot foil stamping method, a technique of a cold foil stamping method that does not require a mold has been developed.

For printing by this cold foil stamping method, a CTP printing plate is used in an offset printing machine to apply an ultraviolet curable adhesive on the surface of the printing substrate, and then the ultraviolet-transmitting metal foil (cold foil) is transferred to the adhesive-applied portion. It is a printing operation in which the metal foil is transferred to the adhesive application part by curing the UV-curable adhesive by irradiating ultraviolet rays from the top of the metal foil through a process of bonding the metal foil to the entire surface by pressing it.

This differs greatly from the conventional hot foil stamping method in that it basically does not use a copper plate, unlike the foil transfer method that requires a work of heating and pressurizing a copper plate for post-processing foil work. It has the advantage that it is highly efficient and can be applied to printing substrates (for example, heat-shrinkable films, etc.) susceptible to heat.

As a related technology, the technology of the cold foil stamping sheet as shown in Fig. 2 is known.This technology is different from the foil work by the hot foil stamping method, which is a post-processing type, and the form of the foil work is printed as a pre-processing work. This is a form that precedes the step.

2 is a prior art, as related to the “cold stamping sheet and its manufacturing method” of Korean Patent Registration No. 10-1052219, which includes the steps of preparing a synthetic resin sheet, a foil, and a UV-curable adhesive; From the UV-curable adhesive bonding unit 3 on a part or the entire sheet forming a pattern on the synthetic resin sheet 2 supplied from the sheet supply unit 1 Attaching the UV-curable adhesive; Compressing the foil (5) supplied from the foil supply unit (4) on the sheet to which the UV-curable adhesive is attached in a pressing unit (6); Irradiating ultraviolet rays in the UV irradiation unit 7 to the sheet to which the foil is pressed; Printing with ink on a portion of the sheet to which the UV-curable adhesive is not attached or on the foil adhered to the sheet; And removing the non-adhesive foil from the portion of the UV-irradiated sheet to which the UV-curable adhesive is not attached to the non-adhesive foil receiving portion 8 by a method of manufacturing a cold stamping sheet 9 and a manufacturing method thereof. The technology of the manufactured cold stamping sheet is disclosed.

This technology proposes a cold foil stamping method that solves the inefficient printing method using copper plate, which is a problem of the hot foil stamping method, which is a problem in the conventional hot foil stamping method. Simplify the process by not going through the process of the engraving step of engraving the pattern so that it is in a state. Although it is advanced in that it has been done, it does not show concretely the application of various color foil compositions and the printing stage to implement them, but shows only a simple principled technical concept.

In other words, in the application of the cold foil stamping method, the focus is on the foil transfer and is explained only in a principle form. Therefore, the simultaneous expression of foils made of various designs and various colors in the main printing stage after the foil transfer stage and The efficiency of printing work has not been presented in detail or in detail, so it has its limitations.

Due to the recent printing technology trend, the printing method of cold foil stamping, which transfers metal foils such as gold, silver, hologram, etc., to have a metallic effect on the substrate, has been introduced to commercialize cosmetic packages, confectionery packaging, and alcohol labels, attracting attention. have.

Under such circumstances, it is necessary to develop high-functional products with various functions, high-end products by expressing high-quality designs, and high-value-added products applicable to various uses by using cold foil stamping printing technology.

The present inventors focused on the problems of inefficient printing work and design and color expression of the conventional stamping printing technology, and failed to meet the trend required by the present era: high functionality, high quality, high quality various designs, and diversification of uses. I paid attention to the limiting phenomenon.

In order to overcome these problems, the present inventors have studied carefully, and as a result of conducting a foil transfer operation and a color printing operation together in a single printing processing process, a low-cost and high-efficiency printing operation is achieved, and various colors are applied to the surface of the paper sheet in the printing processing stage. By simultaneously expressing the foil of the paper, it is possible to realize the whole or part of the metal color, and it is possible to overprint with CMYK printing ink while giving a feeling like a foil. In addition, the surface gloss of the processed paper can be adjusted to the intensity and angle of light. A metallic paper expressing the feeling of the liquid metal of the present invention that can be applied to various purposes with a high quality by expressing the feeling of flowing water according to the viewer's gaze. The printing method was created and developed.

The term “metallic paper” described below is a high-quality paper that expresses the surface gloss while having the color and texture of the metal material in the expressed part in expressing the metallic effect by forming an image or pattern on the surface of the paper. Means paper.

In addition, the term “liquid metal” used in the present invention has the meaning of liquid metal when it is literally translated, and the meaning of a hard solid form is considered when referring to a normal metal, but hereinafter the expressed metal form is It refers to a metal that gives a feeling of flowing water by changing the texture and color of the reflective surface according to the intensity and angle of light and the viewer's gaze.

“Metal color” refers to the color expressed by the texture of the metal material itself.

“Offset printing” is a method of indirect printing in which the ink on the rubber blanket is printed on the paper by pressure tube after transfer printing once on a rubber blanket that acts as an intermediary without printing directly on the printed material with a printing plate. The principle is to print with the repulsion of water and oil, and this water serves to prevent ink from adhering to the non-linear part of the printing plate (the part without a picture-hydrophilicity), and the offset ink in the line drawing part (the part with the picture). It is a method of printing while delivering ink to paper instead of water because of the lipophilicity of the solvent.

“Mesh dot printing” refers to printing by using a set of fine dots composed of halftone dots, that is, to visually feel the shade by the density distribution of the dots.

“Spot color printing” refers to a form in which ink compositions are combined according to the respective color of the image to be expressed and printed with color inks each mixed and manufactured, and has a form in which platemaking is performed as much as the frequency of each color.

“Gradient” refers to the level of density gradually changing from the bright part to the dark part of a picture or photograph.

“Overprinting” refers to the printing process by separately overlapping the upper surface of the paper to which the metal foil transferred from the foil is attached through the stamping process.

“Surface gloss” refers to the degree to which light rays that are displayed while shining from the paper surface are reflected according to the intensity or angle of light.

“Texture” refers to the feeling of the material properties of an object that is sensed visually or tactilely.

“Post-processing” refers to coating, foil, mold pressure, laminating, shape picking, and other types of processing that change the surface and shape of printed prints.

Republic of Korea Patent Registration 10-1052219 B1 PCT Patent Publication WO 02/34521 A1 PCT Patent Publication WO 2014/207175 A1

Accordingly, it is an object of the present invention to express the feeling of foil of various colors in whole or in part at the same time in a single printing process without a separate operation such as foil or spot color printing in paper processing, as well as the feeling of foil. It is to provide a metallic paper that expresses the feeling of liquid metal and its printing method, which enhances productivity through high-efficiency printing such as shortening the printing time and reducing cost by allowing a certain design pattern to be printed together.

In addition, another object of the present invention is that the surface gloss of the processed paper stream changes the texture and color of the surface reflected according to the intensity and angle of light and the viewer's gaze to give a visual feeling of liquid metal as if flowing through water. It is to provide metallic paper and its printing method that express the feeling of liquid metal, which can be expected of this superior quality.

In addition, another object of the present invention is to provide a metallic paper that expresses the feeling of liquid metal that enhances design expression by being combined with CMYK ink to express the texture of a metal material and capable of overprinting in various colors and designs, and a printing method thereof. It is in providing.

In addition, another object of the present invention is a liquid metal that provides a differentiated high-quality paper having a three-dimensional effect by allowing partial or whole gradation to be realized in the expression of the design pattern of the foil, and by allowing the region to be divided and shaded to be expressed. It is to provide metallic paper that expresses the feeling and its printing method.

In addition, another object of the present invention is that since foil printing is possible partially and entirely, the use of offset printing can be achieved from small-sized tags, cards and packages to large-sized posters and large-sized POPs, and It is to provide metallic paper that expresses the feeling of liquid metal that can be expanded and applied to various uses such as wrapping paper, paper plates, or models, and a printing method thereof.

In addition, another object of the present invention is to provide a metallic paper and a printing method for expressing the feeling of a liquid metal capable of recycling paper from an eco-friendly aspect.

In addition, the inventors of the present invention use a foil for cold stamping as a kind of foil used to form the metal foil 120 in the registered invention disclosed in Korean Patent No. 10-1638374, which is a film formed by thinly spreading metal and As a thin thin film in which metal powder is deposited on a thin resin film made of synthetic resin in the same form, it has various colors, but it has been disclosed that there are three types of gold foil, silver foil, and hologram foil as representative ones. I didn't explain how.

This led to a patent application for those skilled in the art, hoping that a better invention would be born.

In order to achieve the above object, the present invention is a printing method of metallic paper processed by a cold foil stamping method in which the base paper and the metal powder are integrally laminated by placing an adhesive at the position where the metal powder is to be transferred from the foil to the base paper. The method comprising: pre-installing a printing plate for applying an adhesive plated in the same shape as a design pattern to which the metal powder is attached, and a color printing plate for each CMYK plated according to the shape and color of the image to be expressed on an offset printer; Supplying raw paper from the paper feeder to the printing plate for applying the adhesive by driving an offset printer; Applying an adhesive to the upper surface of the original paper supplied to the printing plate for applying the adhesive in the same shape as the image pattern to which the metal color is to be expressed; A pressing step of a metal foil in which the metal powder layer is transferred and integrally attached from the foil filled with the metal powder layer to the upper surface of the portion to which the adhesive is applied; A color printing step in which the base paper on which the metal powder layer is pressed is sequentially passed through the color printing plates for each CMYK, and the upper surface of the metal powder layer is printed with halftone dots to express the color by combining them; metallic to express the feeling of a liquid metal consisting of In the paper printing method, the foil manufacturing method is made at room temperature, and is made of a synthetic resin film (PET film), a thermoplastic resin composition, and a metal powder as components as the main raw materials, and as step 1, a thin synthetic resin is made. The step of producing a film (a); As step 2, forming a thermoplastic resin layer (b) by applying a thermoplastic resin composition as a transparent material on the surface of the synthetic resin film (a) and having a particle size of about 1,600 to 3,500 Å; As step 3, a metal powder layer (c) by vacuum depositing a metal powder on the thermoplastic resin layer (b); At this time, the metal powder layer is a printing method of metallic paper expressing the feeling of liquid metal, characterized in that only the metal powder can be transferred by the adhesive applied to the base paper.

In the present invention, in the color printing step, the metallic paper expresses the feeling of liquid metal, characterized in that the area of the metal foil is divided into small areas, and the color density is gradually changed for each small area. This is the printing method.

By means of the above solution, the present invention not only allows the color printing work to simultaneously express the foil of various colors with a certain design pattern while making the foil processing work and the glossy foil feel in a single printing process. In addition, double-sided printing is possible because there is no press mark due to the foil work, so there is an effect of improving the efficiency of printing work such as cost reduction.

In addition, the present invention provides a visual feeling of liquid metal that looks like water flowing according to the intensity or angle of light and the viewer's gaze in the processing of a branch, so that the surface gloss reflected from the surface of the branch is excellent, so it is excellent for expressing a high-class design. There is an effect that can be expected to improve the quality of the product.

In addition, the present invention is combined with CMYK ink in the printing stage to enable overprinting, so that the texture and color of all metal materials can be expressed with various color foils, thereby enabling the expression of a luxurious design form.

In addition, the present invention has the effect of providing a differentiated high-quality paper by expressing a design pattern having a three-dimensional effect and an aesthetic feeling by implementing a partial/full foil gradation in the expression of a design pattern and giving a shade.

In addition, the present invention can be used for the use of offset prints from small-sized tags, cards, and packages to large-sized posters and pops, and can also be extended to applications such as packaging paper, paper plates, or models. It has the effect of diversifying uses.

In addition, since the present invention does not use a resin film in terms of environment-friendliness, there is an effect that papers can be recycled when discarded.

1 is a view showing the principle of hot foil stamping processing according to the prior art;
Figure 2 is a view showing the processing principle of the conventional cold foil stamping,
3 is a conceptual diagram of the entire printing apparatus according to the prior art applied to the present invention,
4 is a view of an in-line foiler device for thinning according to the prior art applied to the present invention,
5 is a flow chart showing the steps of a method for printing metallic paper according to the prior art applied to the present invention,
6 is a processing cross-sectional view of a metallic paper according to the prior art applied to the present invention,
7 is a view showing the steps of a method for printing metallic paper according to the present invention;
8 to 10 are embodiments of a special metallic paper according to the present invention,
8 is a real photo of a metallic paper expressing a multi-day metal color according to the present invention,
9 is a real photo of a metallic paper expressing a three-dimensional metallic color according to the present invention,
10 is a real photograph to which the gradation technique is applied according to the present invention,

Hereinafter, specific embodiments of the "metallic paper expressing the feeling of liquid metal and its printing method" of the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

First, Figure 3 is a conceptual diagram of an offset printing machine for processing metallic paper according to the prior art applied to the present invention, the offset printing machine is largely a feeding device, a printing device. It consists of a water fountain device, an ink supply device, and a discharge device.

In the present invention, an in-line foiler device 20 that separately supplies foil so as to be located in front of the offset printer 10 is mounted to perform pre-processing of foil transfer processing, followed by dot printing for each CMYK ink that expresses color. The printing operation by the color printing apparatuses 14 to 17 and the equipment of the UV coating apparatus 18, which is located at the rear of the color printing apparatus and performs the coating operation thereafter, are interlocked with each other.

Accordingly, an inline foiler device and a UV coater are installed so as to be interlocked with each printing device, and a printing plate for adhesive application, a printing plate for each color of CMYK, and a printing plate for coating are respectively mounted on the printing device. The printing plates are configured to be sequentially interlocked with a supply device, a rubber blanket, and a pressure tube, which are the main components of the printing device.

4 is a diagram of an in-line foiler device for thinning according to the prior art applied to the present invention. This in-line foiler device is a foil supply device separately installed on the upper side of the printing device in front of the offset printer, and a printing plate for applying adhesive is mounted. As a device interlocked with the printed device, it is a facility for foil transfer work, that is, thinning.

This in-line foiler device 20 is in a state where the unused foil is wound on the front side, and the foil used on the back is wound after the metal foil is attached to the surface of the base paper to which the adhesive is attached through the printing plate for applying the adhesive. It is a device.

That is, the metal powder deposited on the foil under pressure by receiving the foil from the unused foil winding unit 21 on the base paper coated with the adhesive through the printing plate for applying the adhesive, and causing the foil to come into contact with the adhesive applied part of the base paper through a tenderness. The layer is transferred to the adhesive-applied portion to be pressed integrally, and the portion to which the adhesive is not applied is wound around the used foil winding portion 22 together with the portion used as it is.

In this way, when the metal powder layer is transferred from the foil to the base paper, the adhesive must be uniformly applied to the surface of the base paper, and care must be taken to prevent quality defects so that the metal powder layer is transferred cleanly by maintaining a constant tension and pressure of the tenderness of the foil. shall.

Prior to the printing step-by-step process of the present invention, the preparatory work will be described.

First, offset printing is the principle of lithographic printing using a non-water and oil-free material. Therefore, separate the image and the non-irregular part with only chemicals on a plate without irregularities, and apply printing ink to the rubber plate (blanket). It is the principle that the image is transferred to paper.

This offset printing is a preliminary preparatory work, and after confirming the design for printing, it undergoes a plate making step of processing and manufacturing a plurality of printing plates made of aluminum on which the design image is formed by performing halftone printing on the CTP plate according to the shape of each image image and color.

In other words, it performs the platemaking work of the CTP plate, which makes a printing plate directly without going through the film stage with computer data.The printing plate which fixed the image through the process of image curing, removal of unnecessary parts, cleaning, and drying on a thin aluminum plate coated with a developer is performed. It is to be printed on a printing device, and an adhesive coating plate for attaching (printing) an adhesive in the form of a design in which the foil is to be transferred, four printing plates for each CMYK color, and a printing plate for coating agent coating are produced.

At this time, halftone dots are printed on each plate according to the image shape to which the design is to be expressed, and fine halftone dots are densely distributed in the image shape of the design to form over the entire surface.

The shape of the halftone dots is formed in any one of a circular shape, a rhombus shape, and a chain shape. In order to prevent the moire phenomenon that the image is damaged, the arrangement of the halftone dots is made differently between the plates at different angles.

Install the CTP plates plated as described above in each printing device of the offset printing machine, install the foil on the inline foiler, fill the ink for each CMYK, fill the coating liquid, and supply the paper for printing to the paper feeder. Complete the preparation.

In this way, after the preparation work is finished, a test print job is performed to check the quality, and then the main printing job is performed.

The printing process of the metallic paper processed and printed according to the present invention will be described.

5 is a view showing the steps of a method for printing metallic paper according to the prior art applied to the present invention, and FIG. 6 is a cross-sectional view of processing the metallic paper according to the present invention.

First, as a plate-making installation step, the printing plate for applying the adhesive plated in the same shape as the design pattern to which the metal foil is to be attached, and the color printing plates for each CMYK plated according to the shape and color of the image to be expressed are placed in each position on the offset printer. This is the pre-installation step.

The following is a step of supplying the raw paper of the present printing job, which is a step of supplying the raw paper 100 from the paper feeding device 11 to a printing plate for applying an adhesive by driving an offset printer.

Next, as an adhesive application step, the adhesive layer 110 is formed by applying the adhesive in the same form as the image pattern to express the metal color from the adhesive printing unit 12 to the upper surface of the original paper supplied to the printing plate for adhesive application. It is a step to do. In this step, the adhesive is evenly applied to the surface-coated base paper.

The next step is a metal foil pressing step, in which the metal foil is integrally attached by transferring the metal powder layer from the foil to the upper surface of the base paper where the adhesive is applied, and the foil is in-line from the unused foil winding unit 21 The metal powder is transferred and attached to the surface of the base paper to which the adhesive applied in the design shape to be expressed in the foil attachment part 13 is attached while being pressed by the pressure tube, and the metal powder is attached through the foiler device 20. The discharged foil is wound up with the used foil winding unit 22.

The next step is a color printing step, in which the base paper on which the metal foil is pressed is sequentially passed through the color printing plates for each CMYK, and the upper surface of the metal powder layer is printed by halftone dots in the CMYK printing units 14 to 17, and the color printing layer 130 is combined. ) Is displayed in the color printing stage.

This step has the form of expressing the color by combining the image color to be expressed by sequentially printing the CMYK ink composition according to the composition ratio, and then combining the K color ink printing process, the C color ink printing process, and the M color ink. It is printed in the order of printing process and Y color ink printing process.

As described above, after the metal foil 120 is formed, the color printing layer 130 on the upper surface of the foil, that is, a printing operation in which a color layer is formed on the metal foil, can be performed. By forming a combination of color layers thereon, it is possible to express a foil made of metal color having a surface gloss, and at the same time, it is possible to express various colors at the same time, thereby giving a splendid feeling. Of course, it should be noted that printing is possible even on parts where the metal foil is not attached.

After the color printing step, it may include a step of further forming a coating layer 140 on the upper surface of the metal foil on which the color has been separately printed, and the metal color expressed in the color printing step is applied to the coating liquid in the coating liquid printing unit 18. By covering it, it keeps the quality by preventing the metal color from being deformed during transportation or use, that is, scratches or scratches. It should be noted that this coating step is not required and can be done optionally.

The present invention is a series of printing processing processes that integrate a foil processing operation and a printing operation while going through the above steps, wherein the base paper is changed step by step through adhesive application, metal powder layer transfer, and color printing. As overprinting is possible, various designs and colors can be simultaneously expressed, thereby increasing the efficiency of printing work.

As described above, a technique for expressing the feeling of a foil in various colors and a configuration for simultaneously performing color printing are the main core components of the present invention.

In addition, since the metallic paper printed according to the present invention does not use a resin film, it has an eco-friendly advantage that can be recycled when discarded.

The main constituent parts of metallic paper printed by the above printing process will be described.

The base paper 100 used in the present invention is a type of coated paper, and is classified into high glossy paper and matte glossy paper in relation to gloss, and representative products are art paper and cast. Coated paper (CCP; cast coated paper) is used.

Here, the use of paper with a coated surface means that the coated paper with a smooth surface should be used to ensure that the metal powder layer is transferred cleanly because the adhesive is uniformly applied to the surface without penetrating into the inside when the adhesive is applied. For the sake of Uncoated paper is because the adhesive penetrates into the paper and the surface is not uniform. Therefore, it is partially lifted during the transfer of the metal powder layer or the foil transfer operation is uneven, resulting in defective products.

On the other hand, the paper used in the present invention is used in the range of the basis weight of 80 ~ 500g / ㎡. At this time, if the basis weight is less than 80g/m2, it is too thin to handle paper by an offset printing facility, and if it is over 500g/m2, it is difficult to handle paper because it is too thick.

In the present invention, paper with a basis weight of 80 to 150 g/m² is suitable for letter envelopes, letterheads, wrapping paper, and wrappers, and the range of 150 to 250g/m2 is suitable for cards, leaflets, pamphlets, etc., in the case of 250 to 500g/m2 Can be used as an editorial cover such as a package or magazine.

In the present invention, a glue is used as the adhesive applied to the surface of the base paper to form the adhesive layer 110, but a UV curable adhesive may be used.

In the present invention, as the type of foil used to form the metal foil 120, a foil for cold stamping is used, and the foil is a thin film in which metal powder is deposited on a thin resin film made of synthetic resin in the form of a film formed by thinly spreading metal. As a thin film, it has various colors, but there are three types of hologram foils consisting of gold foil using gold, silver foil using silver, and various thermoplastic resin compositions as representative ones.

Its foil manufacturing method can be explained as follows.

The temperature at the time of manufacturing the foil is made at room temperature, but is preferably 25-28 degrees, and a synthetic resin film (PET film), a thermoplastic resin composition, and a metal powder are manufactured as main raw materials.

Step 1) Prepare a thin synthetic resin film (a) (select a transparent resin as much as possible).

Step 2) A thermoplastic resin composition is used as a transparent material on the surface of the synthetic resin film (a), and the particle size is applied to about 1,600 to 3,500 Å to prepare a foil having a thermoplastic resin layer (b).

Step 3) A metal powder layer (c) is formed by vacuum depositing a metal powder on the foil, that is, on the thermoplastic resin layer (b). At this time, the metal powder layer should have a degree of adhesion so that only the metal powder can be transferred by the adhesive applied to the base paper.

On the other hand, as the ink used for the color printing layer 130 in the present invention, four types of inks of CMYK, namely C (Cyan, cyan), M (Magenta, magenta), Y (Yellow, yellow), K ( Black, black) inks are combined by adjusting the ratio of each component and sequentially printed with halftone dots to express colors, so that all colors related to metal colors can be expressed.

CMYK ink is combined by halftone printing according to each color according to each CMYK printing plate to express colors.CMYK elements contained in the original color image are decomposed into 4 CTP plates to create a color printing plate. to be. Usually, the more colors are mixed, the darker and lower the brightness.

On the other hand, as the type of coating agent used for the coating layer 140 in the present invention, a glossy or matte coating agent is used, and this coating agent forms a film on the surface of the part to which the metal foil is attached, so that the expressed metal color is not damaged from the outside. In order to prevent it, coating liquid is applied in the last process to improve the quality of metallic paper during the printing process.

Gloss coating helps the color of the printed ink, and it is bright, cool and conspicuous as the color and color contrast appear bright, and the matte coating subsides the color little by little and lowers the color contrast to make it elegant and elegant. Show.

7 is a view showing the steps of a method for printing metallic paper according to the present invention.

In the present invention, the effect (so-called, for example, liquid metallic effect and gradation effect) must be printed on the metal powder layer, but if the process (winding after printing) is printed on'foil', the patent invention itself in this case Since the object cannot be achieved because it does not work (form) or does not find the significance of the problem to be solved, a problem arises in the establishment of the invention.

Therefore, in the process, since the winding of the non-adhesive foil is performed after the metal foil pressing step, it can be seen that it is not included in the protection range when it is performed after the color printing step.

8 to 10 are real photographs showing examples of metallic paper according to the present invention and examples of a model assembled using the same. It should be noted that the metal foil used in the present embodiments was printed using silver foil.

FIG. 8 is a real photograph of a metallic paper expressing multiple metal colors according to the present invention. In this embodiment, a metal foil is formed over the entire surface to show a single metal color of red or blue.

9 is a real photo of a metallic paper expressing a metallic color expressing a three-dimensional effect according to the present invention. In this embodiment, the area of the metal foil is divided into small areas in the color printing step, and different colors are simultaneously expressed for each small area. This is an example of showing multiple metal colors by making them appear to give a feeling of various metal colors.

FIG. 10 is an embodiment of a real photograph of metallic paper to which a gradation technique is applied according to the present invention. In the color printing step, the area of the metal foil is divided into small areas, and the color density is changed step by step for each small area to be expressed. Yes.

The surface gloss reflected from the branch surface (e.g., the part indicated by glasses) gives a visual feeling that changes according to the intensity or angle of light and the viewer's gaze. It can be expected to be of high quality.

Although not shown, a paper plate may be manufactured using the metallic paper according to the present invention. In this case, the surface of the metallic paper according to the present invention may be laminated to be used in the form of a plate.

General disposable dishes are made of plastic or aluminum and are in use, but most of the special designs are not formed. However, it is possible to create a classy atmosphere by expressing a variety of design forms and metal colors that can show the unique characteristics of the paper.

The present invention is not limited by those described above, and various modifications and variations are made within the scope of the technical idea of the present invention and the claims to be described below by those of ordinary skill in the art to which the present invention pertains. It will be possible.

As such, the present invention enhances the functionality to enhance the aesthetics and to have a liquid metal-like feel while enabling more high-quality expression through the expression of gloss, splendor, and various colors and designs, which are properties inherent in metallic paper. It is possible to provide high-quality papers by providing the metallic paper.

It is widely used as a cosmetic package, poster, etc. for its main purposes, but it can gradually spread its use range to letter envelopes, cards, tags, labels, large posters or POPs, wrapping paper, model materials, paper plates, etc. In addition, it is spread to various fields such as interior and industrial products, as well as packages for packaging objects other than cosmetics, so that its use can be diversified.

In addition, the demand for high-functional products with various functions and the trend of high-end design by expressing high-quality designs continue to increase global demand. The present invention is a technology that responds to this, so the value of strategic commercialization as a high value-added product suitable for this. It can be said that is very large.

10: offset printing machine 11: paper source
12: adhesive printing portion 13: foil attachment portion
14~17: CMYK printing unit 18: Coating liquid printing unit
20: inline foiler 21: unused foil winding attachment
22: Use foil winding installation
100: base paper 110: adhesive layer
120: metal foil 130: color printing layer
140: coating layer

Claims (2)

In the printing method of metallic paper processed by a cold foil stamping method in which the base paper and the metal powder are integrally laminated by placing an adhesive at a position where the metal powder is to be transferred from the foil on a base paper,
Pre-installing a printing plate for applying an adhesive plated in the same shape as a design pattern to which the metal powder is attached, and a color printing plate for each CMYK plated according to the shape and color of the image to be expressed on the offset printer;
Supplying raw paper from the paper feeder to the printing plate for applying the adhesive by driving an offset printer;
Applying an adhesive to the upper surface of the original paper supplied to the printing plate for applying the adhesive in the same shape as the image pattern to which the metal color is to be expressed;
A pressing step of a metal foil in which the metal powder layer is transferred and integrally attached from the foil filled with the metal powder layer to the upper surface of the portion to which the adhesive is applied;
A color printing step in which the base paper on which the metal powder layer is pressed sequentially passes through the CMYK-specific color printing plates and prints the upper surface of the metal powder layer with halftone dots to express the color by combining them; In the paper printing method,
The method of manufacturing the foil is made at room temperature, and is made of a synthetic resin film (PET film), a thermoplastic resin composition, and a metal powder as the main ingredients,
As step 1, preparing a thin synthetic resin film (a);
As step 2, forming a thermoplastic resin layer (b) by applying a thermoplastic resin composition as a transparent material on the surface of the synthetic resin film (a) and having a particle size of about 1,600 to 3,500Å;
As step 3, the metal powder layer (c) by vacuum depositing the metal powder on the thermoplastic resin layer (b);
At this time, the metal powder layer is a printing method of metallic paper expressing the feeling of liquid metal, characterized in that only the metal powder can be transferred by the adhesive applied to the base paper.
The printing of metallic paper for expressing the feeling of liquid metal according to claim 1, wherein in the color printing step, the area of the metal foil is divided into small areas, and the color density is changed step by step for each small area. Way.

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