This application claims the benefit of priority to Korean Patent Application No. 10-2019-0161731 filed on Dec. 6, 2019 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.
The present disclosure relates to a gravure printing plate and a gravure printing device using the same.
Gravure printing is a method of forming a printing pattern by engraving on a surface of a cylindrical metal roll, injecting ink into the pattern, and then transferring the pattern onto a surface of a printing object in a continuous paper form, wound in a roll form. Gravure printing has been widely used in photography, packaging and textile printing because it is much faster than conventional plate printing and has excellent printing quality. Recently, gravure printing has been applied to various processes within the IT and electronics industries, beyond an existing application field, thanks to excellent productivity thereof.
Meanwhile, a paste filled in a printing pattern of a gravure roller may be transferred to a printing sheet and subjected to a leveling process. In this case, there may be a problem in which leveling is completed with a state of having unevenness, rather than being leveled flat, due to interfacial tension of the paste. In addition, there may be a problem that printing roughness may be reduced because a printing pattern may be smeared or a sufficient amount of paste may not be transferred.
An aspect of the present disclosure is to provide a gravure printing plate and a gravure printing device having improved printing roughness.
Another aspect of the present disclosure is to provide a gravure printing plate and a gravure printing device having improved thickness distribution.
Another aspect of the present disclosure is to provide a gravure printing plate and a gravure printing device having improved breakdown voltage (BDV) characteristics.
An aspect of the present disclosure is to provide a gravure printing plate including a convex portion and at least two polygonal cells partitioned by the convex portion, and including at least one or more protruding portions disposed toward a central portion from an edge of the cell and a gravure printing device.
The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which:
Hereinafter, embodiments of the present disclosure will be described as follows with reference to the attached drawings. It is not intended to limit the techniques described herein to specific embodiments, and it should be understood as including various modifications, equivalents, and/or alternatives to the embodiments of the present disclosure. In connection with the description of the drawings, similar reference numerals may be used for similar components.
In the drawings, for clarity of description, parts irrelevant to the description may be omitted, and thicknesses of elements may be magnified to clearly represent layers and regions. Components having the same functions within a scope of the same idea may be described using the same reference numerals.
In the present specification, expressions such as “having”, “may have”, “include” or “may include” may indicate a presence of corresponding features (e.g., components such as numerical values, functions, operations, components, or the like), and may not exclude a presence of additional features.
In the present specification, expressions such as “A or B”, “at least one of A or/and B” or “one or more of A or/and B”, and the like, may include all possible combinations of items listed together. For example, “A or B”, or “at least one of A or B” may refer to all cases including (1) at least one A (2) at least one B, or (3) both at least one A and at least one B.
In the drawings, an X direction may be defined as a first direction, an L direction or a longitudinal direction, a Y direction may be defined as a second direction, a W direction or a width direction, and a Z direction may be defined as a third direction, a T direction or a thickness direction.
Hereinafter, a method of manufacturing a multilayer ceramic electronic component according to an embodiment of the present disclosure will be described in detail with reference to
Referring to
In general, in the case of concave-plate printing such as gravure printing, there is a problem that it is difficult to obtain a printed material having high smoothness due to a difference in interfacial tension between a printing medium and an object to be printed and/or viscosity of the printing medium. In order to solve this problem, a method of increasing smoothness through a process in which a printing medium (paste) is transferred to an object to be printed and then leveled is used. However, in the process of transferring the printing medium filled in the cell, there may be a problem in which transferring is performed unevenly by the convex portion forming the cell, and a printing film is not completely flattened due to a lack of a transfer amount, resulting in a large print thickness distribution.
The gravure printing plate according to the present disclosure is aimed to resolve the above-described issues, it is possible to improve thickness distribution and increase printing quality, by placing a protruding portion 311 inside the cell 310 toward a central portion from an edge of the cell 310.
The gravure printing plate according to the present disclosure may include two or more polygonal cells 310 partitioned by the convex portion 312. In the present specification, the cell is partitioned by the convex portion, which may mean that cells are formed on both sides, based on one convex portion. Two or more cells 310 may be included, and the number of cells may be adjusted according to intended use.
An upper limit of the number of the cells is not particularly limited, but may be, for example, 100,000 or less.
The cells of the gravure printing plate according to the present disclosure may have a polygonal shape. The polygonal shape may mean a figure consisting of a finite line segment.
The line segment may mean a straight line, but may mean a line segment including a curved portion within an error range of, for example, ±10° as well as a straight line in a strict sense. Since the shape of the cell is formed by the convex portion partitioning the cell, the shape of the polygonal cell may be formed by a convex portion. In this case, the convex portion may be formed such that a plurality of convex portions form an angle of 180° or less, a lower limit of the angle formed by the plurality of convex portions is not particularly limited, for example, may exceed 0°. That is, the cell according to the present disclosure may have a form of a convex polygon.
In an embodiment of the present disclosure, a height of a convex portion 312 may be in a range of 5 μm to 30 μm. The height of the convex portion 312 may mean a depth of the cell 310 partitioned by the convex portion 312. When the height of the convex portion 312 is less than 5 μm, printing of printed matter corresponding to the cell 310 may not be easy. In addition, when the height of the convex portion 312 exceeds 30 μm, the thickness of the printed matter formed on the object to be printed may be thick, which may not facilitate thinning of a final product.
In one example, as shown in
In an embodiment of the present disclosure, when a longest distance from any one edge of a cell of a gravure printing plate passing through a center of the cell to a convex portion opposing the edge is a length (A) of a cell, a ratio (B/A) of a length (B) of the protruding portion of the cell may be 0.167 or more.
In an example of the present disclosure, in the gravure printing plate according to the present disclosure, two or more protruding portions maybe disposed inside one cell. The number of protruding portions can be adjusted according to the shape of the cell, the type and viscosity of the printing medium. An upper limit of the number of the protruding portions is not particularly limited. But, for example, when the shape of the cell is n-square, the number of protruding portions may be n or less (where, n is a natural number). That is, one or more or two or more exemplary protruding portions of the present disclosure may be included in the cell, and may be disposed at all edges of the cell.
In an embodiment of the present disclosure, in the gravure printing plate according to the present disclosure, one side of the convex portions of the cell may be disposed to correspond to one side of the convex portion of another adjacent cell, the gravure printing plate may include a path disposed in the convex portion such that the cells are connected in the printing direction.
In one example, when the gravure printing plate of the present disclosure includes a path, a width (d) of the path may be in a range of 10 μm to 20 μm. When the width (d) of the path is less than 10 μm, an effect of improving the thickness distribution through the passage maybe insignificant, and when the width thereof exceeds 20 μm, the thickness distribution of the printing medium may increase.
The present disclosure also relates to a gravure printing device.
The unwinder 11 and the rewinder 13 may be a partial configuration of a roll-to-roll facility, and as such, since a sheet is printed using the roll-to-roll facility, continuous printing may be performed. The roll-to-roll facility may be provided with a plurality of support rolls (not shown), and the plurality of support rolls may serve to support and move the sheet.
The gravure printing plate 120 is a plate on which a printing pattern is engraved. A gravure printing plate as described herein maybe used as the gravure printing plate 120. The material of the gravure printing plate 120 is not particularly limited, and may be, for example, a glass material, a nickel material, a resin material, a sus material, and the like, but is not limited thereto.
A fixing plate 130 may be disposed at a lower end of the gravure printing plate 120 as needed to suppress deformation of a pattern during printing, but is not limited thereto.
The chamber doctor 140 may apply a printing paste to the surface of the gravure printing plate 120, to fill the plurality of cells 110 with the printing paste. The chamber doctor 140 may be a sealed chamber doctor 140 in which the printing paste is disposed in a dispositional space therein, and in the case of using the sealed chamber doctor 140, the printing paste maybe used from low viscosity to high viscosity.
A printing paste may be disposed in the sealed chamber doctor 140. The specific form of the chamber doctor 140 is not particularly limited, and the material thereof is not particularly limited.
Referring to
The squeegee 143 may be a configuration to scrape a printing paste remaining on the surface of the gravure printing plate 120 to remove the printing paste remaining on the surface of the gravure printing plate 120, thereby filling a printing paste only inside the plurality of cells 110 of the gravure printing plate 120 formed by engraving. The specific shape or material of the squeegee 143 is not particularly limited, and a shape or material well known in the art may be applied.
The pressing roll 150 may press the sheet 101 to serve to contact the surface of a flat plate 202. The pressing roll 150 may be formed of a material having elasticity, and may be raised and lowered by a driving member 160. The pressing roll 150 may have a shape in which a diameter decreases from a central position in a longitudinal direction toward an edge, and in this case, the pressing roll 150 may be flatly deformed, such that the pressure applied to the sheet 101 may be uniform, but is not necessarily limited thereto, and may be made of another material or may have a shape having the same diameter.
A drying device 12 may use a device of a type generally used in the art, and may be integrated with a roll-to-roll device. For example, the drying device 12 may include a drying chamber, and in this case, drying may be performed in a chamber disconnected from the outside. In addition, nitrogen or argon maybe injected into the chamber, and internal pressure, or the like, may be appropriately adjusted.
In addition, the printing method using the gravure printing device according to the present disclosure may include a step of transferring the filled printing paste. In the step of transferring the printing paste, the sheet 101 moving in a printing direction (arrow) may be pressed using the pressing roll 150 to be in contact with a plurality of cells 110 filled with the printing paste 145 of the gravure printing plate 120 moving in the printing direction (arrow).
The moving direction of the sheet 101 and the moving direction of the gravure printing plate 120 may be the same as in the printing direction, and the surfaces of the sheet 101 and the gravure printing plate 120 may be in contact with each other by the pressing roll 150 during the movement. In this case, a printing paste 145 of the gravure printing plate 120 may be directly transferred to the sheet 101.
The printing paste 145 may vary depending on an applied product. For example, when printing an internal electrode of a multilayer ceramic capacitor, the printing paste 145 may include a mixture of conductive powder, a resin, a solvent, and the like, but is not limited thereto.
As the conductive powder, various conductive metals such as silver (Ag), gold (Au), platinum (Pt), copper (Cu), aluminum (Al), nickel (Ni), and the like can be used. In this case, the metal may be an alloy. In addition, the metal may be formed by a method of coating another metal to particle grains of conductive powder. The particles may have various shapes such as spherical, dendrites and flakes.
Various resins, such as a thermosetting resin, an ultraviolet curable resin, a thermoplastic resin, can be used for a resin. The thermosetting resin may be, for example, a melamine resin, an epoxy resin, a phenol resin, a polyimide resin, an acrylic resin, and the like. The ultraviolet curable resin may be, for example, an acrylic resin which has a (meth) acryloyl group, an epoxy resin, a polyester resin, and a mixture thereof and a monomer. In addition, the thermosetting resin may be, for example, a polyester resin, a polyvinyl butyral resin, a cellulose resin, an acrylic resin and the like. These resins may be used alone or in combination of two or more thereof.
In order to prevent drying of the printing paste 145 in a printing process, it is preferable to contain a high boiling point solvent with a boiling point of 240° C. or more in the solvent. As such a high boiling point solvent, there may be, for example, diamyl benzene, triamyl benzene, diethylene glycol, diethylene glycol monobutyl ether acetate, diethylene glycol dibutyl ether, diethylene glycol monoacetate, triethylene glycol, triethylene glycol mono Methyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, tetraethylene glycol, tetraethylene glycol monobutyl ether, or the like. However, the present disclosure is not limited thereto, and a low boiling point solvent may also be used.
The sheet 101 may vary depending on the applied product. For example, the sheet 101 may be a dielectric sheet when printing the internal electrodes of the multilayer ceramic capacitor, but is not limited thereto.
The dielectric sheet may be formed of a ceramic powder having a high dielectric constant, and the ceramic powder may be, for example, barium titanate (BaTiO3) based powder, strontium titanate (SrTiO3) based powder, or the like, but is not limited thereto, and other known ceramic powders can be used. The dielectric sheet may be formed by applying and drying a slurry including the ceramic powder on a carrier film to prepare a plurality of ceramic green sheets. That is, although not specifically illustrated in the drawing, the sheet 101 may be formed on the carrier film.
A printing method using the gravure printing device according to the present embodiment may also include a step of filling a printing paste and a step of transferring the filled printing paste.
The gravure roll 220 is immersed in a printing paste 245, which is a printing medium accommodated in the supply container 241 for supplying the printing medium while rotating. While being immersed in the printing paste, the printing paste 245 may be filled inside a cell of the gravure printing plate disposed on the gravure roll 220, the cell of the gravure printing plate may be headed to the pressing roll 250 along the rotating gravure roll 220.
A doctor blade 240 may be disposed on the surface of the gravure roll 220 as necessary. The remaining printing media after filling the cell of the gravure printing plate may be scraped off by the doctor blade 240. The printing paste filled in the cell may be transferred to the sheet 101 at the point where the gravure roll 220 and the pressing roll 250 contact to each other.
As set forth above, according to an embodiment of the present disclosure, a gravure printing plate and a gravure printing device capable of improving printing roughness may be provided.
According to another embodiment of the present disclosure, a gravure printing plate and a gravure printing device capable of improving thickness distribution may be provided.
According to another embodiment of the present disclosure, a gravure printing plate and a gravure printing device capable of improving breakdown voltage (BDV) characteristics may be provided.
However, various and advantageous advantages and effects of the present disclosure are not limited to the above description, and will be more readily understood in the process of describing specific embodiments of the present disclosure.
While this disclosure includes specific examples, it will be apparent to one of ordinary skill in the art that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents.
Number | Date | Country | Kind |
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10-2019-0161731 | Dec 2019 | KR | national |