JP2014034211A - Print roll and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a print roll improved in manufacturing efficiency and productivity and a method of manufacturing the same.SOLUTION: A print roll 100 includes a cylinder roll 110, and a printing pattern layer 124 formed on the cylinder roll 110 by a thermal spraying method. The printing pattern layer 124 is formed by performing laser processing of a thermal spraying coating formed using a high velocity oxy-fuel coating spraying (HVOF) method.

Description

  The present invention relates to a printing roll and a manufacturing method thereof, and more particularly to a printing roll having improved manufacturing efficiency and life characteristics and a manufacturing method thereof.

  In general, a gravure printing roll is widely used as a printing roll. This gravure printing roll is a roll having an intaglio pattern, and usually has a cylinder roll made of steel or other metal material and an intaglio printing pattern layer formed on the surface of the cylinder roll.

  For the production of such a gravure printing roll, a plating process for forming a plating layer such as copper (Cu) on a cylinder roll, a process for forming a black coating film on the plating layer using a photosensitive solution, and this black A laser process for removing a part of the coating film, an etching process for processing the plating layer at a desired depth, a process for removing the black coating film, and chromium (Cr) for protecting the surface of the plating layer And a surface protective layer forming step of forming a plating layer with the material.

Korean Published Patent No. 10-2011-0070924

  However, when such a printing roll is used for a certain period of time, the surface protective layer is peeled off by a metal component contained in a doctor blade or printing ink, resulting in a defective printed product. Life is shortened. In addition, since the printing roll as described above has to be manufactured by an exposure and etching process with high production facilities and complicated processes, the efficiency and productivity of the manufacturing process are lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a printing roll having improved production efficiency and productivity, and a method for producing the same.

  Another object of the present invention is to provide a printing roll having improved life characteristics and a method for producing the same.

  In order to solve the above object, a printing roll according to the present invention includes a cylinder roll and a printing pattern layer formed on the cylinder roll by a thermal spray method.

  According to an embodiment of the present invention, the printed pattern layer is formed by processing a thermal spray coating formed using a high velocity oxy-fuel coating spraying (HVOF) method with a laser.

  According to one embodiment, the thickness of the printed pattern layer is 350 μm or less.

  According to an embodiment, the printed pattern layer has a groove having a depth of 5 to 30 μm.

  In addition, a method for manufacturing a printing roll according to another embodiment of the present invention includes a step of preparing a thermal spray material, a step of forming a thermal spray coating on a cylinder roll using the thermal spray material, and the thermal spray coating. Performing a laser processing step to form a printed pattern layer.

  According to one embodiment, the step of preparing the thermal spray material includes mixing 80 wt% to 95 wt% metal carbide and 5 wt% to 20 wt% metal powder.

  According to one embodiment, the step of preparing the thermal spray material includes mixing 80 wt% to 95 wt% tungsten carbide, 4 wt% to 15 wt% cobalt, and 1 wt% to 5 wt% chromium powder.

  According to one embodiment, the step of preparing the thermal spray material comprises 80 wt% to 95 wt% tungsten carbide, 3 wt% to 12 wt% cobalt powder, 1.5 wt% to 6 wt% chromium powder, and 0.5 wt%. Mixing 2% to 2% by weight of nickel power.

  According to an embodiment, the step of forming the sprayed coating is performed on the sprayed material using a high-speed flame spraying (HVOF) method.

  According to one embodiment, forming the printed pattern layer includes processing the thermal spray coating with a laser having a wavelength of 1000 nm to 1100 nm and a pulse width of 300 ns or less.

  According to an embodiment, the step of forming the sprayed coating is performed such that the sprayed coating has a thickness of 150 μm to 400 μm, and the step of forming the printed pattern layer includes the step of forming the printed pattern layer of 350 μm or less. Is carried out to have a thickness of

  According to one embodiment, the method further includes the step of planarizing the sprayed coating.

  According to the present invention, a printing pattern layer formed by a thermal spraying method is used as a printing plate, and printing defects caused by peeling of a surface protective layer of a plating pattern and a reduction in the life of a printing roll can be reduced during a printing process. Can be prevented.

  In addition, according to the present invention, a metal pattern layer having a hardness higher than that of copper can be embodied as a printed pattern layer, and the life of the roll can be improved as compared with the case where a printed pattern layer of steel material is used. Can do.

  Moreover, according to this invention, compared with the case where a roll is manufactured using a plating and an etching process, a process can be simplified and productivity can be improved.

  In addition, according to the present invention, compared to a printing roll using a copper pattern as a printing pattern layer, printing is performed to prevent printing failure and life reduction caused by peeling of the surface protective layer of the plating pattern during the printing process. Rolls can be manufactured.

1 is a diagram illustrating a printing roll according to an embodiment of the present invention. It is a flow chart showing a manufacturing method of a printing roll by an embodiment of the present invention. 3 is a diagram for explaining a manufacturing process of a printing roll according to an embodiment of the present invention. 3 is a diagram for explaining a manufacturing process of a printing roll according to an embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Each embodiment shown below is given as an example so that those skilled in the art can sufficiently communicate the idea of the present invention. Therefore, the present invention is not limited to the embodiments described below, but can be embodied in other forms. In the drawings, the size and thickness of the device can be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification. In addition, the etching region indicated by a right angle may be provided in a form that is round or has a predetermined curvature.

  The terminology used herein is for the purpose of describing embodiments and is not intended to limit the invention. In this specification, the singular includes the plural unless specifically stated otherwise. As used herein, “includes” a stated component, step, action, and / or element does not exclude the presence or addition of one or more other components, steps, actions, and / or elements. Want to be understood.

  Hereinafter, with reference to the accompanying drawings, a printing roll and a manufacturing method thereof according to an embodiment of the present invention will be described in detail.

  FIG. 1 is a view showing a printing roll according to an embodiment of the present invention. Referring to FIG. 1, a printing roll 100 according to an embodiment of the present invention includes a cylinder roll 110 and a printing pattern layer 124 formed on the cylinder roll 110.

  The cylinder roll 110 is made of a ceramic material. However, when the cylinder roll 110 is made of a ceramic material, pores are generated in the sprayed coating for forming the printed pattern layer 120 due to the characteristics of the ceramic material, and the ink is transferred during the printing process. is there.

  The print pattern layer 124 is formed on the surface of the cylinder roll 110 to form a print pattern layer on a specific print object (not shown). That is, the printing pattern layer 124 may be a pattern that directly transfers ink to the printing object during the printing process as the printing plate itself. The printed pattern layer 124 is formed by performing a laser processing process on a thermal spray coating formed by a thermal spray method. The detailed manufacturing process of the printed pattern layer 124 will be described later.

  The printed pattern layer 124 may be a metal pattern layer made of a metal material. For example, the printed pattern layer 124 may be a pattern layer formed by using a metal carbide having a relatively higher hardness than copper or a mixed material of metal powder as a thermal spray material. For example, the metal carbide includes tungsten carbide. Examples of the metal powder include at least one of cobalt, chromium, titanium, molybdenum, aluminum, and nickel. As an example, the printed pattern layer 124 may be a metal pattern layer including tungsten, cobalt, and chromium. As another example, the printed pattern layer 124 may be a metal pattern layer including tungsten, cobalt, chromium, and nickel. The printed pattern layer 124 may be made of various metal materials, but is not limited thereto.

  According to one embodiment, the printed pattern layer 124 has a thickness T1 of approximately 350 μm or less. When the thickness T1 of the printed pattern layer 124 is more than 350 μm, the amount of the sprayed material increases during the process of forming the sprayed coating for forming the printed pattern layer 124, and the process time increases excessively. May end up. Accordingly, the thickness T1 of the printed pattern layer 124 is desirably adjusted to about 350 μm or less.

  The printing pattern layer 124 has a groove 126 for functioning as a printing plate. The groove 126 is formed by performing a laser direct machining process on the sprayed coating. The depth D of the groove 126 is adjusted to approximately 5 μm to 30 μm. When the depth D of the groove 126 is less than 5 μm, the amount of ink filled in the groove 126 is small during the printing process, and the printing efficiency is lowered. On the other hand, when the depth D of the groove 126 is more than 30 μm, there is a disadvantage that a part of the ink filled in the groove 126 remains without being transferred during the printing process.

  As described above, the printing roll 100 according to the embodiment of the present invention includes the cylinder roll 110 and the printing pattern layer 124 that is formed on the cylinder roll 110 by a thermal spraying method and functions as a printing plate. In this case, compared to the printing roll, the plating pattern is used as a printing plate, and printing defects and roll life reduction caused by peeling of the surface protective layer that protects the surface of the plating pattern by the doctor blade and the printing ink metal component are reduced. Can be prevented. As a result, the printing roll according to the present invention uses a printing pattern layer formed by a thermal spraying method as a printing plate, and causes printing defects or printing rolls caused by peeling of the surface protective layer of the plating pattern during the printing process. A reduction in life can be prevented.

  In addition, the printing roll 110 according to the embodiment of the present invention includes a cylinder roll 110 and a printing pattern layer 124 of, for example, a tungsten material. In this case, a metal pattern layer such as tungsten having a relatively high hardness can be used as the print pattern layer as compared with a printing roll having a copper print pattern layer. As a result, the printing roll according to the present invention can implement a metal pattern layer having a hardness higher than that of copper as a printing pattern layer. Can be improved.

  Next, the printing roll manufacturing method according to the above-described embodiment of the present invention will be described in detail, and redundant description will be omitted.

  FIG. 2 is a flowchart illustrating a method for manufacturing a printing roll according to an embodiment of the present invention. FIGS. 3 and 4 are diagrams for explaining a process for manufacturing a printing roll according to an embodiment of the present invention. .

  As shown in FIG. 2, a thermal spray material is prepared (S110). The step of preparing the thermal spray material includes a step of mixing a predetermined metal carbide and metal powder to produce a mixture. Examples of the metal carbide or the metal powder include a metal material having a relatively higher hardness than copper (Cu). As an example, the metal carbide includes tungsten carbide. Examples of the metal powder include at least one of cobalt, chromium, titanium, molybdenum, aluminum, and nickel.

  The content of metal carbide and metal powder as described above may be variously adjusted. As an example, the step of preparing the thermal spray material may be performed by mixing 80 wt% to 95 wt% tungsten carbide, 4 wt% to 15 wt% cobalt, and 1 wt% to 5 wt% chromium powder. As another example, the step of preparing the thermal spray material includes 80 wt% to 95 wt% tungsten carbide, 3 wt% to 12 wt% cobalt powder, 1.5 wt% to 6 wt% chromium powder, and O.D. It may be performed by mixing 5 wt% to 2 wt% of nickel powder.

  According to an embodiment, the metal carbide has a particle size of approximately 15 μm to 45 μm. When the particle size of the metal carbide is less than 15 μm, there is a problem that the metal carbide is melted before reaching a predetermined melting temperature at the time of forming the sprayed coating, and the state of the sprayed material (that is, the powder state). The spraying process is difficult to perform. On the other hand, when the particle size of the metal carbide exceeds 45 μm, the metal carbide does not melt at a predetermined melting temperature when forming the sprayed coating, and the metal carbide remains in a determined state in the sprayed coating. is there.

  2 and 3, a thermal spray coating 122 is formed on the surface of the cylinder roll 110 using a thermal spraying method (S120). This thermal spraying method includes an operation of coating a predetermined meltable material on the surface of the cylinder roll 110 using a predetermined injector 10. The spraying method includes plasma spraying, detonation spraying, wire arc spraying, frame spraying, worm spraying, and cold spraying. And at least one of high-speed flame spraying (HVOF).

  As an example, a high-speed flame spraying method may be used as the spraying method. When this high-speed flame spraying method is used, it is possible to form a relatively dense sprayed coating composition as compared with other spraying methods, and there is no inconvenience that ink is transferred in the printing process. Other examples include the vacuum plasma and maspray methods, and in this case as well, a relatively fine spray coating composition can be formed as compared with other spray methods.

  Meanwhile, the step of forming the thermal spray coating 122 is performed such that the thickness T2 of the thermal spray coating 122 is adjusted to approximately 150 μm to 400 μm. The reason why the thickness T2 of the thermal spray coating 122 is 150 μm or more is to ensure a minimum thickness margin for the thermal spray coating 122 to function as the printed pattern layer 124. Specifically, after the sprayed coating 122 is formed, a step of flattening the sprayed coating 122 is performed as a subsequent process. This flattening step may be selectively performed after the sprayed coating forming step as described above and after a laser processing step described later. By such a flattening process, the thickness of the thermal spray coating 122 can be reduced to about 30 μm to 100 μm. Further, by forming a groove 126 having a certain depth in the sprayed coating 122, it can function as a printed pattern layer. Accordingly, considering the thickness reduction due to the planarization and the formation of grooves for the printed pattern layer, the thickness T2 of the thermal spray coating 122 is desirably set to about 150 μm or more. On the other hand, when the thickness T2 of the thermal spray coating 122 exceeds 400 μm, the process time for forming the thermal spray coating 122 increases excessively, and the amount of the thermal spray material used increases unnecessarily.

  Next, as shown in FIGS. 2 and 4, a laser processing step is performed on the thermal spray coating 122 to form grooves 126 in the thermal spray coating 122, thereby forming a printed pattern layer 124 (S130). The laser processing step is performed by directly investigating the laser on the thermal spray coating 122 using a predetermined laser 20.

  Examples of the laser processing step include a step of using any one of a carbon dioxide laser, an oxygen laser, a yttrium aluminum garnet laser (YAG laser), an excimer laser, and a fiper laser. As an example, the laser direct processing step may use a fiber laser having a wavelength of about 1000 nm to 1100 nm and a pulse width of about several tens of nanoseconds (ns) or less. Desirably, the grooves can be formed with a fiber laser having a relatively short pulse width of approximately 300 ns or less. When the pulse width of the fiber laser exceeds 300 ns, and more than a micro unit, the instantaneous output of the laser during the laser processing step is low, and the instantaneous energy required for the laser processing may not be sufficient. The laser processing depth may be approximately 5 μm to 30 μm. As a result, the groove 126 having a depth D of about 5 μm to 30 μm is formed.

  The laser processing step as described above is repeated approximately 1 to 7 times. Specifically, the thermal spray coating 122 is processed to a depth of about 3 μm to 5 μm by one laser processing step. Thus, in order to form the groove 126 having the desired depth as described above, that is, the depth D of about 5 μm to 30 μm, the laser processing step as described above is repeated about once to about 7 times.

  Further, before or after the laser processing step, an operation of flattening the sprayed coating 122 may be additionally performed. This flattening process is an operation of flattening the surface of the thermal spray coating 122 formed by the thermal spraying method as a mechanical flattening process. As described above, this flattening step is performed so that the thickness T1 of the printed pattern layer 124 is adjusted to about 350 μm or less.

  As described above, in the method for manufacturing a printing roll according to an embodiment of the present invention, the thermal spray coating 122 is formed on the cylinder roll 110, and the print pattern layer 124 is formed on the thermal spray coating 122 by a laser direct processing process. Steps. In this case, relatively complicated and expensive production facilities such as plating and etching processes are unnecessary. Thereby, the manufacturing method of the printing roll according to the invention can simplify the process and improve the productivity as compared with the case of manufacturing the roll using the plating and etching processes.

  Moreover, the manufacturing method of the printing roll by embodiment of this invention can manufacture the printing roll which uses metal pattern layers, such as tungsten which has comparatively high hardness compared with copper, as a printing pattern layer. As a result, the printing roll manufacturing method according to the present invention reduces printing defects and lifespan caused by peeling of the surface protective layer of the plating pattern layer during the printing process, compared to a printing roll using a copper pattern layer as a printing pattern layer. It is possible to manufacture a printing roll that prevents the above.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

100 Printing Roll 110 Cylinder Roll 122 Spray Coating 124 Print Pattern Layer 126 Groove

Claims (12)

A cylinder roll;
A printing roll comprising: a printing pattern layer formed on the cylinder roll by a thermal spraying method.   The printing roll according to claim 1, wherein the printing pattern layer is formed by processing a thermal spray coating formed using a high-speed flame spraying (HVOF) method with a laser.   The printing roll according to claim 1, wherein the thickness of the printing pattern layer is 350 μm or less.   The printing roll according to claim 1, wherein the printing pattern layer has a groove having a depth of 5 μm to 30 μm. Preparing a thermal spray material;
Forming a thermal spray coating on a cylinder roll using the thermal spray material;
Forming a print pattern layer by performing a laser processing step on the sprayed coating.   The method for manufacturing a printing roll according to claim 5, wherein the step of preparing the thermal spray material includes a step of mixing 80 wt% to 95 wt% of metal carbide and 5 wt% to 20 wt% of metal powder.   The printing according to claim 5, wherein the step of preparing the thermal spray material comprises mixing 80 wt% to 95 wt% tungsten carbide, 4 wt% to 15 wt% cobalt, and 1 wt% to 5 wt% chromium powder. Manufacturing method for a roll.   The step of preparing the thermal spray material includes 80 wt% to 95 wt% tungsten carbide, 3 wt% to 12 wt% cobalt powder, 1.5 wt% to 6 wt% chromium powder, and 0.5 wt% to 2 wt% nickel powder. The manufacturing method of the roll for printing of Claim 5 including the step which mixes.   The method for producing a printing roll according to claim 5, wherein the step of forming the sprayed coating is performed by a high-speed flame spraying (HVOF) method for the sprayed material.   The method for producing a printing roll according to claim 5, wherein the step of forming the printing pattern layer includes a step of processing the thermal spray coating with a laser having a wavelength of 1000 nm to 1100 nm and a pulse width of 300 ns or less. The step of forming the sprayed coating is performed such that the sprayed coating has a thickness of 150 μm to 400 μm,
The method for producing a printing roll according to claim 5, wherein the step of forming the printing pattern layer is performed so that the printing pattern layer has a thickness of 350 μm or less.   The manufacturing method of the printing roll of Claim 5 which further includes the process of planarizing the said thermal spray coating.

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