KR102380305B1 - A method of printing ceramic ink on metal plates and A metal plate printed with ceramic ink using the method - Google Patents

Abstract

The present invention relates to a method for printing ceramic ink on a metal plate, and a metal plate printed with a ceramic ink using the same. According to the present invention, the method comprises: a cleaning step of removing contaminants from a metal plate surface on which an image is to be printed; a first drying step of drying a cleaned metal plate; a step of coating a firstly dried metal plate surface with inorganic polysilazane; a second drying step of drying the metal plate coated with the inorganic polysilazane; a step of firing the polysilazane coating on a secondly dried metal plate surface; a step of printing white ceramic ink on the metal plate surface gone through the polysilazane coating firing step; a third drying step of drying the metal plate on which the white ceramic ink is printed; a color ceramic ink printing step of finally printing an image on a thirdly dried metal plate; a fourth drying step of drying the metal plate on which the image is printed; and a step of firing the ceramic ink of a fourthly dried metal plate. Therefore, the utilization of ceramic ink printing can be improved.

Description

A method of printing ceramic ink on metal plates and A metal plate printed with ceramic ink using the method

The present invention relates to a method of printing ceramic ink on a metal plate and a metal plate printed with ceramic ink using the method, and more particularly, to a method for coating a metal plate to enable printing using ceramic ink, and by the method It relates to a metal plate printed with ceramic ink.

Inkjet printing technology is a technology that prints by spraying fine ink droplets on an object through a nozzle, and is widely used for home and industrial use. Ink types used in inkjet printing can be largely divided into organic inks and inorganic inks.

Organic ink is good for obtaining a desired color tone because of its vivid color and coloring, but it has a problem of discoloration and discoloration easily when exposed to light and heat for a long period of time due to poor durability. On the other hand, inorganic ink has weak coloring power and low color clarity, but has good durability and is mainly used when long-term storage is required.

As an inorganic ink, ceramic ink is mainly printed on glass and tile, and has been mainly used for exterior decoration of buildings or outdoors. Since ceramic ink prints have to be completed through a high-temperature firing process of 600°C to 1200°C, they have no choice but to be used only on glass or ceramic tile materials that can withstand high temperatures. However, glass or ceramic materials have limitations in being difficult to use universally in daily life due to their heavy and fragile properties.

Korean Patent Publication No. 10-2019-0075226 Korean Patent Registration No. 10-1494263

An object of the present invention is to provide a method of printing ceramic ink on a metal plate so that printing using ceramic ink can be used universally, and a metal plate on which ceramic ink is printed using the same.

An object of the present invention is to provide a method for increasing the utility of ceramic ink printing by providing a method for printing ceramic ink on a metal plate.

Another object of the present invention is to provide a method for printing a ceramic ink on a metal plate, thereby providing a means for long-term storage of a printed metal plate.

A method of printing ceramic ink on a metal plate according to the present invention for achieving the above object includes a cleaning step of removing contaminants from the surface of the metal plate to be printed on, a primary drying step of drying the cleaned metal plate, and primary drying A step of coating the inorganic polysilazane on the surface of the metal plate, a secondary drying step of drying the metal plate coated with inorganic polysilazane, and the firing of the polysilazane coating on the surface of the secondary dried metal plate; A step of printing white ceramic ink on the surface of the metal plate that has undergone the glass coating firing step, a third drying step of drying the metal plate printed with white ceramic ink, and a color ceramic ink printing step of final printing an image on the third dried metal plate And, a fourth drying step of drying the metal plate on which the image is printed, and the step of firing the ceramic ink of the fourth dried metal plate.

In addition, in the washing step, the panel surface is sufficiently wetted with a washing solution diluted in water with an alkali detergent in a ratio of 1% to 5% and maintained for 10 minutes, and then water is flowed on the surface of the metal plate by applying a physical force to remove the attached contaminants Removal of oil and washing with an isopropyl alcohol solution, wherein the primary drying step is to put the cleaned metal plate in an oven and dry it at a temperature of 80°C or higher for 5 minutes or more, or use a hot air blower to a temperature of 80°C or higher and blowing hot air with a furnace for at least 5 minutes, wherein the coating of the inorganic polysilazane is first coated with an inorganic polysilazane solution having a solid content of 2% to 10% by a painting technique, followed by a secondary coating in a flow method The secondary drying step includes drying the polysilazane-coated metal plate at a temperature of 100°C or higher in an oven for 5 minutes or more, or performing at a temperature of 100°C or higher with a hot air blower for a predetermined time or longer, , The step of calcining the polysilazane coating includes heating the polysilazane-coated metal plate in a firing furnace at a temperature of 100° C. to 1000° C. for 10 minutes to 120 minutes, or curing it at room temperature for 1 day to 30 days. and, the step of printing the white ceramic ink includes performing the white ceramic ink printing 2-3 times on the entire surface of the metal plate that has undergone the polysilazane coating firing step, and the third drying step is the white ceramic ink printing. Naturally drying the metal plate for a predetermined time in a printing drying rack, wherein the color ceramic ink printing step includes printing with ceramic inks of six colors: magenta, yellow, cyan, black, white, and green, The fourth drying step includes the step of naturally drying the metal plate printed with color ceramic ink for a predetermined time in a printing drying rack, and the step of sintering the ceramic ink includes a preheating section, a heating section with a temperature of 600° C. or higher, and a cooling section During the preheating section 20 to 60 minutes, the heating section 20 to 60 minutes, and the cooling section 40 minutes or more in the kiln steps to be performed.

In addition, the method of printing the ceramic ink on the metal plate may further include immersing the secondary-dried metal plate in a hydrogen peroxide solution for 30 minutes or more before firing the polysilazane coating on the surface of the metal plate.

In the method of printing ceramic ink on a metal plate according to the present invention, the surface of the inorganic polysilazane coating layer is modified to a surface state that can be printed using ceramic ink by removing water repellency through the firing step. It is possible to extend the object to the metal plate.

In addition, the polysilazane-coated metal surface has chemical resistance, corrosion resistance, and heat resistance, so that the printed metal plate can be preserved without discoloration or corrosion for a long period of time.

1 is a flowchart illustrating a method of printing ceramic ink on a metal plate according to a preferred embodiment of the present invention.
Figure 2 is a picture taken of a metal plate coated with polysilazane
3 is a photograph taken in a state in which water droplets are dropped on a surface coated with polysilazane;
4 is a photograph taken at 200 times magnification of the state printed with ceramic ink on the surface of the polysilazane coating layer.
5 is a view showing the modification of the molecular structure of polysilazane in the firing step (S50).
Figure 6 is a photograph comparing the polysilazane-coated metal plate before (left) and after (right) firing
7 is a photograph of a state in which water droplets are dropped on the surface of a fired metal plate;
8 is a photograph taken in a dry state after printing an image on a metal plate
9 and 10 are photographs taken of an example in which an image is printed in a state in which the water repellency of the polysilazane coating layer is not removed.
11 and 12 are photographs of a state in which the ceramic ink firing step is completed;

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings. Various modifications may be made to the embodiments described below by those of ordinary skill in the art to which the present invention pertains. The embodiments described below are not described to limit the present invention to the embodiments. It should be understood that the present invention includes various modifications, substitutions, and equivalents within the scope of the technical spirit understood from the entire specification as well as the following examples.

Hereinafter, a method of printing ceramic ink on a metal plate according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The present invention proposes a method for printing ceramic ink, which has been conventionally mainly used on the surface of glass or ceramic tiles, on a metal surface. The metal plate may be mainly a stainless steel (eg, SUS304) series metal, but is not limited thereto, and various metal plates such as an iron plate, a copper plate, a zinc plate, and an aluminum plate may be used.

For printing, the user prepares the target image to be printed in a digital file format that can be recognized by a ceramic inkjet printer. If necessary, color correction, resolution, and other editing of the image may be performed.

The metal plate should be prepared to satisfy the size specifications usable in a ceramic inkjet printer, and it is preferable to prepare it in a state where there is no surface defects such as dents or dents.

Referring to FIG. 1, the printing method according to the present invention includes a cleaning step (S10) of removing contaminants from the surface of a metal plate to be printed. The cleaning step (S10) is performed to remove adhesions and foreign substances present on the surface of the metal plate. In the cleaning step (S10), the panel surface is sufficiently wetted with a cleaning solution diluted with an alkaline detergent in water at a ratio of 1% to 5% and maintained for 10 minutes, and then water is flowed on the surface to remove the attached contaminants and It can be carried out in a way that removes oil. This cleaning step (S10) may be repeated 2-3 times as needed. An additional cleaning step with an isopropyl alcohol (IPA, isopropyl alcohol) solution may be performed before the cleaned surface is dried. Additional cleaning can be done by wiping the metal plate from the inside out with a soft cloth moistened with IPA. If necessary, additional washing with IPA may be repeated 2-3 times.

Next, a primary drying step (S20) of drying the surface of the metal plate is performed. In the primary drying step (S20), moisture and IPA on the surface of the cleaned metal plate are removed. In the primary drying step (S20), put the cleaned metal plate in an oven and dry it at a temperature of 80°C or higher for 5 minutes or more, or use a hot air blower until all the moisture and IPA on the surface of the metal plate are evaporated at a temperature of 80°C or higher for 5 minutes or more. It can be carried out in such a way that hot air is blown for a sufficient time.

Next, a step (S30) of coating the dried metal plate with inorganic polysilazane (PHPS, Perhydro-polysilazane) is performed. An inorganic polysilazane solution having a solid content of 2% to 10% is first coated with a painting technique on the entire surface to be printed, and then a second coating is performed by a flow method of flowing the polysilazane solution over the same surface. . After secondary coating, naturally dry the metal plate vertically for at least 10 minutes so that the polysilazane solution flows down.

Next, a secondary drying step (S40) of drying the solvent material on the surface of the polysilazane-coated metal plate is performed. In the secondary drying step (S40), the polysilazane-coated metal plate is dried at a temperature of 100°C or higher in an oven for 5 minutes or more, or a sufficient time until all of the solvent material on the surface of the metal plate is evaporated at a temperature of 100°C or higher with a hot air blower can be performed while It is preferable that the secondary drying step (S40) proceeds for a sufficient time until the state in which the viscosity of the surface of the metal plate disappears. 2 is a photograph taken of a metal plate coated with polysilazane, and FIG. 3 is a photograph taken of a state in which water droplets are dropped on a surface coated with polysilazane. As shown in FIG. 3, it is confirmed that the water droplets falling on the polysilazane-coated surface do not spread widely but are gathered. That is, it can be confirmed that the polysilazane coated surface has a property of repelling water droplets, that is, water repellency. The surface with water repellency has the property of repelling ink, making it difficult for ceramic ink to be colored. 4 is a photograph taken at 200 times magnification of a state in which the ceramic ink is printed on the surface of the polysilazane coating layer. The white background in the photo indicates that the ink is not printed, which indicates that the ink does not stick due to the water repellency of the surface. The polysilazane coating layer preferably has an appropriate thickness. If the thickness of the coating layer is excessively thick, cracks are easily induced on the surface, and the printing state on the surface may be poor. In order to prevent surface cracks, the thickness of the coating layer is preferably 1±0.2 μm (micrometer).

Next, a step (S50) of sintering the polysilazane coated on the surface of the metal plate is performed. The polysilazane coating firing step (S50) is performed by heating the polysilazane-coated metal plate in a firing furnace at a temperature of 100° C. to 1000° C. for 10 minutes to 120 minutes, or curing it at room temperature for 1 day to 30 days. . FIG. 5 shows the modification of the molecular structure of polysilazane in the firing step (S50). As shown in FIG. 5, it can be seen that the “N” atom of the Si-N bond is substituted with an “O” atom. A silica (SiO2) thin film may be formed on the surface of the metal plate through the firing step (S50). The surface of the polysilazane coating layer that has undergone the firing step (S50) has water repellency removed and is modified to a printable state. 6 is a photograph comparing before (left) and after (right) firing a polysilazane-coated metal plate. It can be seen that the surface state of the polysilazane coating layer is changed. 7 is a photograph of a state in which water droplets are dropped on the surface of a fired metal plate. It is confirmed that the water drop spreads widely along the surface of the metal plate. That is, it is confirmed that the polysilazane coating surface is changed to a state having hydrophilicity after firing. The surface of the polysilazane coating layer from which the water repellency has been removed is ready for printing using ceramic ink. In the present invention, in order to maintain the surface of the polysilazane coating layer having hydrophilicity, in the firing step (S50), 100% of the “N” atoms of the Si-N bond are substituted with “O” atoms rather than 100% of all “O” atoms. Preferably, for example, 50%±10% are substituted with “O” atoms, most preferably.

On the other hand, prior to the polysilazane coating firing step (S50), a step of immersing the secondary drying metal plate in a hydrogen peroxide solution for 30 minutes or more to promote hydrophilic conversion of the coating film may be added.

Next, a step (S60) of printing the entire white ceramic ink on the surface of the metal plate that has undergone the polysilazane coating firing step is performed. The white ceramic ink printing step (S60) is to prevent the metallic luster from appearing overlaid with the final image by printing the surface of the metal plate in white before the user finally prints the image to be output. The white ceramic ink printing step S60 may be performed using a conventional ceramic inkjet printer. A polysilazane firing coating layer is present on the surface of the metal plate, and white ceramic ink is printed on it. Depending on the printing state, the white ceramic ink printing step ( S60 ) may be repeated 2 to 3 times, and a drying step of 30 minutes may be performed between each cycle.

Next, a third drying step (S70) of drying the metal plate on which the white ceramic ink printing is completed is performed. It is desirable to dry the white ceramic ink for a sufficient time so that it can be completely dried. The third drying step (S70) may be performed by naturally drying the metal plate on which the white ceramic ink is printed for about 24 hours on a drying rack for printing.

Next, a color ceramic ink printing step (S80) of finally printing a desired image on the metal plate on which the white background ink has been dried is performed. In the color ceramic ink printing step (S80), the image prepared by the user to be printed is printed on the white background of the metal plate by the ceramic inkjet printer. Ceramic inkjet printers can use ceramic inks of six colors: magenta, yellow, cyan, black, white, and green.

Next, a step (S90) of drying the metal plate on which the image desired by the user is printed is performed. The drying step ( S90 ) is preferably performed for a sufficient time so that the solvent contained in the color ceramic ink is completely dried. The fourth drying step (S90) may be performed in a manner of natural drying for about 24 hours on a drying rack. 8 is a photograph taken in a dry state after printing an image on a metal plate. 9 and 10 are photographs taken when an image is printed in a state in which the water repellency of the polysilazane coating layer is not removed, and it can be seen that the ink is peeled off without being adhered to the surface.

Next, the ceramic ink firing step (S100) of firing the dried metal plate is performed. The ceramic ink firing step S100 may be performed in a firing furnace. For example, a kiln with a total length of 25 meters, including a preheating section of 5m, a heating section of 5m, and a cooling section of 15m, may be used. The metal plate may be preheated for about 20 to 60 minutes in the preheating section, heated for about 20 to 60 minutes in the heating section, and then cooled in the cooling section for about 40 minutes or more. The heating section may sequentially include three heaters (No. 1, No. 2, No. 3) consisting of an upper and lower pair. In the heating section, the first heater may have a temperature condition of 600° C. or higher, the second heater may have a temperature of 650° C. or higher, and the third heater may have a temperature condition of 650° C. or higher. After the metal plate that has undergone the firing step (S100) undergoes a final check for print quality, processing may be completed. 11 and 12 are photographs of a state in which the ceramic ink firing step S100 is completed. In each photo, the left side shows normal firing, and the right side shows a discolored state due to overheating during firing.

According to the present invention, the surface of the inorganic polysilazane coating layer may be modified to a printable surface state by removing water repellency through the firing step. The ceramic ink printing method according to the present invention can increase the utility of ceramic ink printing by extending the ceramic ink printing object, which was conventionally limited only to glass or ceramic tiles, to metal. In addition, the polysilazane-coated metal surface has chemical resistance, corrosion resistance, and heat resistance, so that it can be stored for a long time.

S10: cleaning step
S20: primary drying step
S30: Inorganic polysilazane coating step
S40: Secondary drying step
S50: polysilazane coating firing step
S60: White Ceramic Ink Print Step
S70: 3rd drying step
S80: Color ceramic ink printing stage
S90: 4th drying step
S100: Ceramic ink firing step

Claims (4)

delete A cleaning step of removing contaminants from the surface of a metal plate to be printed an image, a primary drying step of drying the cleaned metal plate, a step of coating inorganic polysilazane on the surface of the primary dried metal plate, and coating of inorganic polysilazane Secondary drying step of drying the metal plate, firing the polysilazane coating on the surface of the secondary dried metal plate, and printing white ceramic ink on the surface of the metal plate that has undergone the polysilazane coating firing step; A tertiary drying step of drying the metal plate on which the ink is printed, a color ceramic ink printing step of finally printing an image on the tertiarily dried metal plate, a quaternary drying step of drying the metal plate on which the image is printed, and the quaternary drying A method of printing ceramic ink on a metal plate comprising the step of firing the ceramic ink of the metal plate,
In the cleaning step, the surface of the panel is sufficiently wetted with a cleaning solution diluted in water with an alkali detergent in a ratio of 1% to 5% and maintained for 10 minutes, and then water is flowed on the surface of the metal plate by applying physical force to remove the attached contaminants and oil. removing and washing with an isopropyl alcohol solution,
The primary drying step includes placing the cleaned metal plate in an oven and drying it at a temperature of 80°C or higher for 5 minutes or more, or blowing hot air at a temperature of 80°C or higher for 5 minutes or more using a hot air blower,
The step of coating the inorganic polysilazane includes the step of first coating an inorganic polysilazane solution having a solid content of 2% to 10% by a painting technique, and then performing a secondary coating by a flow method,
The secondary drying step includes drying the polysilazane-coated metal plate at a temperature of 100° C. or higher in an oven for 5 minutes or more, or performing at a temperature of 100° C. or higher with a hot air blower for a predetermined time or longer,
The step of calcining the polysilazane coating includes heating the polysilazane-coated metal plate at a temperature of 100° C. to 1000° C. in a firing furnace for 10 to 120 minutes, or curing it at room temperature for 1 to 30 days, and ,
The step of printing the white ceramic ink includes performing the white ceramic ink printing 2-3 times on the entire surface of the metal plate that has undergone the polysilazane coating firing step,
The tertiary drying step includes the step of naturally drying the metal plate printed with white ceramic ink for a predetermined time in a print drying rack,
The color ceramic ink printing step includes printing with ceramic inks of six colors: magenta, yellow, cyan, black, white, and green,
The fourth drying step includes the step of naturally drying the metal plate printed with color ceramic ink for a predetermined time in a print drying rack,
The step of firing the ceramic ink is performed for a time of 20 to 60 minutes in the preheating section, 20 to 60 minutes in the heating section, 40 minutes or more in the cooling section in a calcination furnace including a preheating section and a heating section and a cooling section with a temperature of 600° C. or higher A method of printing ceramic ink on a metal plate comprising a. 3. The method of claim 2,
The method of printing ceramic ink on the metal plate further comprises immersing the secondary-dried metal plate in a hydrogen peroxide solution for at least 30 minutes before firing the polysilazane coating on the metal plate. Method of printing ceramic ink on the metal plate. A metal plate on which ceramic ink is printed by using the method of printing ceramic ink on the metal plate of any one of claims 2 or 3.

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