KR100364642B1 - Wood pattern printing method using screen printing - Google Patents

Abstract

The present invention relates to a method of printing a tree pattern using screen printing, and more particularly, using a mesh screen of 400 mesh or more to print clear and delicate tree patterns having a natural texture on fire doors, It relates to a wood pattern printing method using screen printing to print with UV ink cured by ultraviolet light.

The present invention relates to a screen printing method, comprising: a scanning process of scanning a document in which delicate and clear wood patterns are expressed and inputting it into a computer, and a correcting process of arranging and correcting the wood patterns scanned in the scanning process to fit the size of a fire door; , A dot conversion process for expressing the gradation of the wood pattern produced by the correction process by using a computer in several steps, a film output process for outputting the wood pattern represented by the dot on a transparent film, A screening process that places the screen printing plate on top of the light wood painted fire door by placing it on top of the coated screen mesh, pours the UV ink and pressurizes it with a squeegee, and a UV lamp for the screen printed fire door. Characterized in that it comprises a drying step to dry with.

Description

Wood pattern printing method using screen printing

The present invention relates to a method of printing a tree pattern using screen printing, and more particularly, using a mesh screen of 400 mesh or more to print clear and delicate tree patterns having a natural texture on fire doors, It relates to a wood pattern printing method using screen printing to print with UV ink cured by ultraviolet light.

A fire door is a metal door mainly used in apartments or buildings. It is composed of a frame and a steel plate, and its surface is painted with paint. Fire doors are generally painted in a solid color of gray or blue color, but in recent years, there have been many cases of printing a predetermined graphic to enhance aesthetic function. In particular, in recent years, as the environment-friendly environment is favored, as the cases of decorating the interior of the interior using wood has been greatly increased, wood-fired fire doors that can fit well with the indoor atmosphere are required.

Conventional techniques for expressing wood patterns on fire doors include a method of attaching an adhesive sheet, a membrane sheet, or the like, and a method of expressing wood texture by painting a wood color and scraping it with a scraper. However, the method of attaching a sheet has a problem that a defect occurs frequently as the adhesive strength of the sheet becomes weaker with time, and when artificial wood grains are formed by scratching, the pattern is simple and repeatable to meet the needs of consumers who want a natural pattern. I could not let you.

On the other hand, screen printing is known as a method that can express a more natural wood pattern than the above method. Screen printing is a printing method in which a screen frame is formed by attaching a mesh to a rectangular frame, and a wire line and a non-wire line are formed thereon, and then ink is poured into the screen frame and pressurized with a squeegee to transfer the ink to the printed object. Compared to flat or convex printing, such screen printing can produce a three-dimensional effect by forming a thick ink layer, and it is less discolored, and various types of printing are possible regardless of physical size or shape such as size, shape, and type. And can be applied to fire doors having a hard surface.

However, the conventional technique of printing a wood pattern on a fire door using screen printing has been a method using a solvent type ink. Solvent-based ink is a vehicle, that is, an ink containing a solvent that maintains fluidity in a printing press and, after being transferred to a printed material, forms a solid dry film that is easily volatilized by evaporation or heating (solvent-based ink). Say).

However, since the solvent type ink is easily evaporated and dried during printing, a part of the screen mesh is partially blocked so that the wire is not properly expressed, and when the solvent evaporates during drying, the printed ink is deformed and the wire is deformed. There was a problem with the bungee. Therefore, the screen printing according to the prior art could not express the delicate natural wood pattern.

On the other hand, in order to solve this problem, a method of spraying solvent-type ink on a relatively small mesh screen printing plate has been used, but the problem of spreading fire wires is not fundamentally solved, and delicate and clear wood patterns cannot be expressed. Accordingly, there is an urgent need for a new type of printing method that can express the natural wood pattern cheaply and easily.

The present invention has been made to solve this problem, and the main object of the present invention is to use a tree that uses screen printing to express natural wood pattern by using ink that does not dry during printing and using dense screen mesh and various delicate meshes. It is to provide a pattern printing method.

In addition, the present invention is to provide a wood pattern printing method using a screen printing that can easily express the texture of the natural wood pattern, as well as reduce the work time and cost.

The present invention also provides a wood pattern printing method using screen printing that prints a few steps of dots on a fire door painted with a light wood color so as to produce a natural wood texture in one screen printing.

1 is a flowchart showing a positive document production process according to the present invention;

2 is a flowchart illustrating a wood pattern printing process using screen printing according to the present invention.

In order to achieve the above object, the present invention provides a screen printing method, comprising: a scanning process for scanning a document in which delicate and clear wood patterns are expressed and inputting it to a computer, and the wood pattern scanned in the scanning process according to the size of a fire door. A correction process for arranging and correcting, a halftone conversion process for expressing the gradation of the wood pattern generated in the correction process by using a computer in several steps, a film output process for outputting the wood pattern represented by the dots on a transparent film, A screen printing process for placing the printed film on the screen mesh coated with a photoresist film and photosensitive; placing a screen printing plate on top of a firewood door painted in light wood color; And a drying process for drying the screen-printed fire door with a UV lamp. The.

The present invention also provides a pattern plate processing step of turning the wood thinly so that the wood pattern appears, a surface processing step of processing the pattern of the pattern plate made in the pattern plate processing to be more clear, and a surface movable pattern plate partially And a developing process of dividing into a photographing process and developing a photographed film to produce a positive document.

The present invention is composed of a basic dot processed on the entire surface of the fire door to express the overall color tone and atmosphere, and a dot dot gradation composed of several steps of dot dots according to the continuous gradation of the wood pattern, so that the natural wood texture can be achieved by one screen printing. It is characterized by forming.

In other words, the entire area of the fire door painted with light wood color is treated with 10% dot dots to adjust the overall atmosphere and express the tone with 30%, 50%, 70% and 100% dots depending on the tone of the wood pattern. Screen printing is characterized in that the natural wood texture is formed.

The present invention is characterized by expressing a delicate, clear and natural wood pattern by printing using a variety of dots, including more than 130 dots at the same time using a screen mesh of 300 to 450 mesh preferably 420 mesh.

The present invention is also characterized by the absence of smearing of the caustics by using a UV ink dried by ultraviolet rays.

The present invention also paints the ground color of a firewood door surface in light wood color and expresses several levels of dark dots of dark wood color on the surface of the fire door, so that the color of the ground color and the dot is mixed according to the change of the number of dots. It is characterized by causing.

Hereinafter, with reference to the accompanying drawings will be described in detail a method of printing wood pattern using screen printing according to the present invention.

First, a screen printing plate must be prepared for screen printing. A screen printing plate is a screen mesh that is tied to a screen frame, and a wire section is formed on the screen mesh. Here, screen mesh refers to weaving screen yarns such as silk, nylon, polyester, and stainless steel with weft and warp yarns. The screen mesh has various sizes (mesh) according to the number of wefts and warps contained in a unit area (1 inch). Have

Therefore, the higher the precision of the printed matter, the higher the mesh of the screen mesh, and the lower the precision of the printed matter, the lower the mesh of the screen mesh, usually 60, 70, 80, 100, 120, 133, 150, 170, 200 mesh Generally, 80 mesh or 100 mesh is used most frequently. The present invention uses screen mesh of polyester or stainless steel. Polyester mesh is strong in elasticity, excellent in heat resistance and dimensional stability, and can be used for various printed materials. Stainless mesh is less elastic than polyester, but because of the thin line of steel, it is possible to use very dense mesh of 400 mesh or more. Suitable for caustics In this case, the term “painting line” refers to a picture part.

On the other hand, in order to form a line part on the screen printing plate, it is necessary to first make a tree pattern to be printed as a positive document. In particular, in the printing process, since it is impossible to print with continuous gradation, it is required to create a halftone gradation.

In the past, a halftone photographing was performed by a plate making camera to make a halftone gradation, but recently, various programs for converting a continuous gradation to a halftone gradation have been developed. Here, halftone gradation refers to processing photo gradation with the large and small size of halftone by making photo manuscript of continuous gradation into several large and small dot dots. On the other hand, the number of meshes that can be expressed per unit area (1 inch) depends on the size of the mesh of the screen mesh. Generally, the ratio of the number of meshes to the number of meshes is preferably 1/3 to 1/5. Therefore, when the mesh of the screen mesh is 400 mesh, the mesh is preferably about 100 to 130 per 1 inch unit area. However, since the conventional solvent type ink is dried during printing to block the mesh, only 60-70 or less dots are used to express vivid wood patterns.

On the other hand, the size of the dot is expressed as a ratio of the diameter of the dot to the size of the non-dotted portion, for example, 0% for no dot, 50% for the same area of the dot and non-dotted portion, and only for the dot. Is 100% and 10% when the diameter of the halftone is 1/2 of the non-wire, 30% when half of the diameter of the halftone is the same as the non-wire, and the size of the non-wire is equal to 1/2 of the diameter of the halftone. 70% and so on.

And the method of producing a positive manuscript may vary, as shown in Figure 1, in the present invention, a method of directly scanning a wooden pattern plate, scanning a picture of a wooden pattern or photographing the wooden pattern with a digital camera use. That is, in the past, it was required to make a negative manuscript, but now, since it is possible to edit and modify using a computer, the negative manuscript is not required. In order to obtain a clear and unique wood pattern among the above-described methods, it is necessary to produce wood pattern originals directly.

For example, the process of making a wood pattern manuscript involves turning the wood thinly so that the wood pattern appears, then processing the surface to make the wood pattern of the pattern plate more clear, and partially photographing or scanning the processed pattern plate. . At this time, the processing method of the surface of the wood pattern may be painted or burned.

Next, the wood pattern printing method using screen printing according to the present invention will be described in detail with reference to FIG. 2. Since the wood pattern input in the scanning process is very small compared with the fire door, a plurality of wood pattern photos are arranged and modified to feel natural. I need to edit this to me. The entered and modified tree pattern is then converted into halftones. The dot gradation should take into account the size of the screen mesh to be used in the future and is done on a computer.

Next, the dot-graded wood pattern is printed on a transparent film. In this way, the transparent film expressed in halftone becomes the final positive manuscript to be printed on the screen mesh. This positive manuscript is identical to the original wood pattern except that the combustion gradation is converted to halftone gradation. Particularly, in the present invention, the positive manuscript is treated with 5% to 10% basic dots throughout the entire fire door and 30%, 50 depending on the gradation of the scanned wood pattern in order to preserve the unique pattern of wood while using only a few steps of dot dots. It is treated with halftones such as%, 70% and 100%. At this time, the basic dot and the halftone may be changed in various ways depending on the type of wood pattern.

On the other hand, the screen printing according to the present invention paints a background color with a light color and expresses a few levels of halftones consisting of the same color and the same color as the same color, thereby mixing the background color and the color of the dot with each other according to the number of the halftones, thereby creating a new color. Will be displayed. For example, if you paint a light wood color on the surface of the fire door as shown in the present invention and then express a variety of dots of varying sizes to a darker wood color than the base color on the ground color and the color of the dot is mixed with each other to represent a new color separately Even without color printing, you can use various colors.

In addition, the screen printing according to the present invention uses a photosensitive printing method, in which a material causing a photochemical reaction by light is applied onto a screen mesh, the positive film is adhered to the screen, and then the screen is exposed, washed, and dried in order. To make a plate. In this case, it is preferable to use a diazo-based photosensitive agent, for example, the product name Satigraph 3003. Since the maximum wavelength range of the photosensitive material of the diazo-based material is 400 nm, the light source has an spectral energy of 350-420 nm, such as an arc lamp and a mercury lamp. It is effective to photosensitize using light.

On the other hand, before screening the photosensitive oil on the screen, if the screen mesh is firstly plated, the surface is rubbed with a polishing paste for pretreatment, and if the mesh is in use, it is preferable to use it after degreasing with a cleaning agent and drying it.

Through such a plate making process, since the transparent portion of the positive film passes the light beam, the photosensitive film is cured, and the opaque part does not pass through the light beam. Therefore, when the photoresist film is washed with cold water or suitable hot water, the film on the portion where the light beam does not pass is removed to become a caustic part, and the photoresist film remains on the transparent part that receives the light beam, thereby becoming a non-coating part.

Screen printing is performed using the screen printing plate thus manufactured. In particular, the fire door according to the present invention uses a relatively thick iron plate is a flat printing. That is, when the ink is poured into the screen printing plate and pressed while pressing the ink inside the plate at an angle with a squeegee, the ink is pushed out through the screen mesh at the portion where there is no film and is printed on the printed object.

At this time, the present invention uses a UV ink, for example, a product produced by Nazda (company name). UV curable inks are 100% solids composed of oligomers, monomers, photoinitiators, colorants, additives and the like. As such, 100% solids means no evaporating components. In other words, when UV ink is cured, all chemicals become polymers. When the UV ink is irradiated with UV, a photoinitiator (a kind of catalyst) reacts to polymerize the oligomer and monomer. As such, the UV ink is cured by combining the oligomer and the monomer without evaporating components to form an ink layer connected to each other. In this case, the photoinitiator absorbs a wavelength in the UV energy range of 200-400 nm, and when the energy is absorbed, a chemical reaction occurs and a chain chemical reaction occurs.

That is, the solvent-containing ink has a problem of limiting the selection of the screen mesh because the solvent evaporates during printing to prevent the screen mesh, and the shape of the wire is deformed as the solvent is evaporated, but the UV ink according to the present invention has a solvent component. It is possible to express very vivid and delicate patterns because ultraviolet rays, in particular, chemical reactions are caused only by ultraviolet rays of 300-300 nm, and screen meshes are not blocked during printing.

On the other hand, the speed and bonding strength of the UV ink is changed depending on the porosity, permeability, etc. of the printed material. For example, the untreated paper or the printed material having too much porosity may cause the ink to be absorbed into the printed material too quickly, preventing UV from curing the ink layer properly. However, since the fire door according to the present invention is a metal surface, it is properly cured by UV, and thus the adhesion is very good.

The fire door printed using the UV ink is cured by using the UV lamp. The most economical and effective UV ink curing system is a mercury vapor lamp that emits 120-300 watts per inch. The lamp is usually irradiated with an oval reflector to prevent light leakage.

As described above, the wood pattern printing method using the screen printing according to the present invention can express a natural wood pattern by being able to use a dense screen mesh and a variety of dots because it is not dried during printing using UV ink. .

In the present invention, since the emulsion is not evaporated using the UV ink, it is possible to express a vivid wood pattern because the wire is not deformed or blurred during the drying process.

In addition, the present invention has the effect of producing a natural wood pattern texture containing a variety of colors by printing a halftone gradation corresponding to the gradation of the wood pattern on the wood-painted fire door.

The present invention also has the effect of reducing the work time and cost by expressing the texture of the wood pattern having various tones or gradations in one screen printing.

Claims (6)

In the screen printing method, A scanning process of scanning an original with delicate and vivid wood patterns and inputting it into a computer; A modification process of arranging and modifying the wood pattern scanned in the scanning process to match the size of the fire door; A dot conversion process for expressing the gray level of the wood pattern produced in the correction step as a dot dot of several steps using a computer; A film output process of outputting a tree pattern expressed in halftone on a transparent film, A plate making process in which the printed film is brought into close contact with a screen mesh coated with a photoresist film, and A screen printing process of placing a screen printing plate on the fire door painted with a light wood color, pouring UV ink, and pressing the squeegee for printing. A wood pattern printing method using a screen printing comprising a drying step of drying the screen-printed fire door with a UV lamp. The method of claim 1, wherein the manuscript in which the wood pattern is expressed is a pattern plate processing process for turning the wood thinly so that the wood pattern appears, and a surface processing for processing the pattern of the pattern plate made in the pattern plate processing process to be more clear. And a photographing step of partially dividing and photographing the surface-operated pattern plate, and a developing step of developing the photographic film to produce a positive document. The method of claim 1, wherein the dot conversion process comprises a basic dot dot processed on the entire surface of the fire door to express the overall color tone and atmosphere, and a dot dot gradient composed of several dot dot dots according to the continuous tone of the wood pattern. A wood pattern printing method using screen printing, characterized in that the natural wood texture is formed by printing. The wood pattern printing according to claim 3, wherein the basic dot is 5% to 15%, preferably 10%, and the halftone is 30%, 50%, 70% and 100%. Way. The method of claim 1, wherein the mesh of the screen mesh is 300 mesh to 450 mesh, preferably 420 mesh and the mesh is at least 130 or more. According to claim 1 or 3, wherein the dot is the same color as the base color painted on the surface of the fire door at the same time darker than the base color, so that the color of the base color and the dot is mixed according to the change of the number of dots to produce different colors. Wooden pattern printing method using screen printing characterized in that.