KR101682566B1 - Surface treatment method of metal plate for offset printing unit cylinder jacket - Google Patents

Abstract

According to the present invention, a surface treatment method of a metal plate for an offset printer cylinder jacket comprises: a roughness formation step of forming roughness on a surface of a metal plate; a cleaning step of cleaning the metal plate with roughness having been formed thereon; a metal plate attachment step of attaching the cleaned metal plate to a jig in a cylindrical shape; a plasma heating step of removing impurities existing on a surface of the metal plate attached to the jig in the cylindrical shape using plasma flames; a deposition step of forming a deposition layer by depositing mixed powder including metal powder and ceramic powder onto the surface of the metal plate; a metal plate separation step of separating the metal plate from the jig in the cylindrical shape; a surface flattening step of flattening the surface of the metal plate; and a liquid coating step of reducing roughness of the metal plate by performing liquid coating of the surface of the plate using a coating solution including an abrasion resistance material, a heat resistant material, and a thermo-curable material. According to the surface treatment method of the metal plate for the offset printer cylinder jacket, a uniform coating layer is able to be formed and, more specifically, adhesiveness of a coating layer on an edge portion of the metal plate used as a jacket is increased. In addition, the surface treatment method of a metal plate for the offset printer cylinder jacket increases a hardness of an abrasion resistance layer; is performed by simple processes; and is able to control a thickness of the deposition layer to be uniform with a variance range within 1 m.

Description

TECHNICAL FIELD [0001] The present invention relates to a surface treatment method of a metal plate for an offset printing apparatus cylinder jacket,

The present invention relates to a surface treatment method of a metal plate for an offset printing apparatus cylinder jacket.

The offset printing apparatus comprises a plurality of printing units which are arranged apart from each other as main components. The printing unit is a combination of an ink roller and a plate passing blanket cylinder in which a water roller is mounted and a tender cylinder. In particular, in the offset double-sided printing apparatus capable of double-sided printing, a plurality of printing units are provided on the upper portion and a plurality of printing units are provided on the lower portion.

In the offset double-sided printing apparatus having the above-described configuration, the ink back-up phenomenon is always pointed out as a problem. That is, the pressure of the second lower printing unit in the traveling direction of the printing paper comes into contact with the upper surface of the printing paper, and the upper surface of the printing paper passing through the second lower printing unit is already transferred from the first and second upper printing units And is in a state of being printed. Since the ink takes a certain period of time to dry after printing, the ink that has not dried on the upper surface of the printing paper comes into contact with the tender of the second lower printing unit. The ink adhered to the tender papers may be impregnated with other printing paper, which may result in poor printing quality.

In order to solve such a back hiding phenomenon of ink, conventionally, a cylindrical jacket having a surface coated with a hydrophobic and oleophobic material is sandwiched between the outer circumferential surface of the tampon, thereby solving such ink hiding phenomenon. That is, since the jacket is formed with hydrophobic and oleophobic surfaces, the ink does not transfer to the surface of the jacket and does not transfer even if ink and water are emulsified.

These jackets must not only be coated with materials having hydrophobic and oleophobic properties on their surfaces, but also have wear resistance for long-term use. The conventional printing jacket uses a method of forming a wear resistant layer on a stainless steel base plate by a thermal spraying method and then coating a surface of a hydrophobic and oleophobic carbon resin liquid on the surface to manufacture a jacket . However, when the surface is treated by such a method, it is very difficult to control the thickness of the jacket. Particularly, when the wear resistant layer is formed by spraying, some of the powder is not completely melted by heat, The protruding portion itself has a problem of not only affecting the print quality but also causing the nonwoven fabric for cleaning the jacket to be caught on the protruding portion to leave a residue on the jacket, resulting in poor printing quality.

In order to solve such a problem, the following Patent Document 1 discloses a stiffness-strengthening step of forming an abrasion-resistant layer on the surface of a base plate sandwiched between tangs of an offset printing apparatus, a step of pressing a base plate on which an abrasion- Forming a film by applying a filler of a hydrophobic and oleophobic material to the surface of the wear-resistant layer so that a plurality of voids existing in the wear-resistant layer are filled, There is a problem that it is difficult to form a uniform roughness by forming the roughness on the surface of the metal sheet using shot blasting in the case of Patent Document 1. However, The coating layer of the metal plate rim is easily peeled off. Further, in the case of Patent Document 1 described below, there are problems in that the process is complicated and expensive, and in particular, the hardness of the abrasion resistant layer can not be sufficiently secured since the adhesive layer forming step and the abrasion layer forming step are separately performed.

Accordingly, the development of a surface treatment method of a metal plate for a cylinder jacket of a novel offset printing apparatus in which a uniform coating layer can be formed, in particular, the coating strength of the coating layer at the rim portion of the metal plate used as a jacket is improved and the hardness of the wear- It is a situation that is desperately required.

[Patent Literature]

Patent Document 1: Korean Patent Publication No. 10-2011-0001005 (2011.01.06.)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide a method for manufacturing a metal plate, which can form a uniform coating layer, And a method for surface treatment of a metal plate for a cylinder jacket of an offset printing apparatus.

According to an embodiment of the present invention, there is provided a method of surface finishing a metal plate for a cylinder jacket of an offset printing apparatus, the method comprising: forming a roughness on a surface of a metal plate; A cleaning step of cleaning a metal plate on which surface roughness is formed; A metal plate attaching step of attaching the cleaned metal plate to a cylindrical jig; A plasma heating step of removing foreign matter present on a surface of a metal plate attached to the cylindrical jig using a plasma flame; A deposition step of depositing a mixed powder of a metal powder and a ceramic powder on the surface of the metal plate to form a deposition layer; A metal plate separating step of separating the metal plate from the cylindrical jig; A surface planarization step of planarizing the surface of the metal plate; And a liquid coating step of coating the surface of the metal plate with a coating liquid containing a wear resistant material, a heat resistant material and a thermosetting material to lower the illuminance of the metal plate.

According to another aspect of the present invention, in the surface treatment method for a metal plate for a cylinder jacket of an offset printing apparatus, the step of forming the roughness may include using a scratch phenomenon by a wire brush by rotating the wire brush.

In another aspect of the present invention, there is provided a method of treating a surface of a metal plate for a cylinder jacket of an offset printing apparatus, wherein the cleaning step uses a volatile organic solvent.

According to another embodiment of the present invention, in the method of surface finishing a metal plate for an offset printing apparatus cylinder jacket, the step of adhering the metal sheet may be performed by a method of adhering the ends of the metal sheet to each other with a double-sided magnet.

According to another aspect of the present invention, there is provided a method of surface finishing a metal sheet for an offset printing apparatus for a cylinder jacket, wherein the metal sheet attaching step is performed by attaching a plurality of metal sheets to one cylindrical jig.

According to another aspect of the present invention, there is provided a surface treatment method of a metal plate for a cylinder jacket of an offset printing apparatus, wherein the plasma heating step may be performed by applying a plasma gas flame at 6,000 to 7,000 DEG C while rotating the cylindrical jig .

According to another embodiment of the present invention, there is provided a method of surface finishing a metal plate for a cylinder jacket of an offset printing apparatus, wherein the welding step includes placing the mixed powder in a plasma coater and irradiating a high- And dissolving the mixed powder into the outside to spray the mixture.

In another aspect of the present invention, there is provided a method of surface finishing a metal plate for use in an offset printing apparatus for a cylinder jacket, wherein the thickness of the deposited layer formed by the deposition step is selected from a supply amount of the mixed powder, And can be controlled by adjusting the rotation speed of the jig.

According to another embodiment of the present invention, there is provided a surface treatment method for a metal plate for a cylinder jacket in an offset printing apparatus, wherein the metal powder has a weight ratio of nickel and aluminum of 90:10 to 95: 5 (that is, 90 to 95% 5 to 10% by weight of aluminum).

In another aspect of the present invention, there is provided a method for surface treatment of a metal plate for a cylinder jacket of an offset printing apparatus, wherein the ceramic powder has a weight ratio of alumina (Al ₂ O ₃ ) and titania (TiO ₂ ) of 6: 4 to 7: (I.e., 60 to 70 wt% of alumina and 30 to 40 wt% of titania).

In another aspect of the present invention, there is provided a method of surface finishing a metal plate for a cylinder jacket of an offset printing apparatus, wherein the surface smoothing step is performed using a cylindrical roller.

The surface treatment method of the metal plate for the cylinder jacket of the offset printing apparatus according to the present invention has an advantage that a uniform coating layer can be formed, and in particular, the coating layer adhesion strength at the rim portion of the metal plate used as the jacket is improved. Further, the surface treatment method of the metal plate for cylinder jacket of the offset printing apparatus according to the present invention not only improves the hardness of the wear-resistant layer but also simplifies the process and can uniformly control the thickness of the deposited layer to within an error range of 1 占 퐉 It also has an advantage.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing main process steps of a surface treatment method of a metal plate for a cylinder jacket of an offset printing apparatus according to an embodiment of the present invention. FIG.
FIGS. 2A and 2B are diagrams schematically showing an overall process of a surface treatment method of a metal plate for a cylinder jacket of an offset printing apparatus according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing the surface state of the metal plate according to each step of the surface treatment method of the metal plate for cylinder jacket of the offset printing apparatus according to an embodiment of the present invention.

Before describing the invention in more detail, it is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense, It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the constitution of the embodiments described in the present specification is merely a preferred example of the present invention, and does not represent all the technical ideas of the present invention, so that various equivalents and variations And the like.

FIG. 1 is a process diagram showing main process steps of a surface treatment method of a metal sheet for a cylinder jacket of an offset printing apparatus according to an embodiment of the present invention. FIG. 2 is a cross- FIG. 3 is a cross-sectional view schematically showing the surface state of the metal plate according to each step of the surface treatment method of the metal plate for cylinder jacket of the offset printing apparatus according to an embodiment of the present invention. FIG. to be.

The method of surface treatment of the metal plate according to the present invention will be described in detail with reference to FIGS. 1 and 2. FIG.

First, a metal plate 100 made of a component such as stainless steel is cut to a predetermined length and width, and then the surface of the metal plate thus cut is cleaned. The metal plate 100 typically has a thickness of 0.25 to 0.5 mm. Such surface cleaning steps may be performed in various ways and may be omitted in some cases.

Then, the roughness-forming step S100 is performed to form the roughness-forming layer 101 so as to have uniform roughness as a whole on either side of the cleaned surface of the metal sheet 100 thus cleaned.

The illumination forming step S100 may be performed in various ways. Conventionally, shot blasting is used in which sand or metal particles are mixed into compressed air and sprayed to one side of the metal plate at a high pressure in order to form roughness on one side of the metal plate. Although the step of forming the roughness may be performed by using the shot blasting, as described later, the wire brush WB is formed in order to form a uniform roughness on the surface of the metal plate and to form a uniform roughness even on the edge of the metal plate. Is preferably used.

That is, when the roughness is formed on the surface of the metal plate through the shot blasting, which is a conventional method, it is impossible to perform the blasting with a uniform intensity on the entire surface of the metal plate due to the characteristics of shot blasting, There is a problem in that the shape of the metal plate is deformed when the metal plate is thin. Especially, it is very difficult to perform the shot blasting even to the edge portion of the metal plate, so that there is a problem that a portion with no illumination is left on the edge of the metal plate.

On the other hand, if the roughness formed on the surface of the metal plate is not uniform, the adhesion layer (coating layer) described later on the surface of the metal sheet may not have a uniform adhesive force as a whole. In particular, The coating layer formed on the rim of the metal plate is easily separated from the surface of the metal plate.

However, when the roughness is formed on the surface of the metal plate using the wire brush WB as described above, it is possible to solve all the problems of shot blasting.

As described above, in order to form the roughness using the wire brush, the roughness forming roller R1 having the wire brush formed on the surface thereof can be used. The wire brush WB can be manufactured by using a high strength metallic wire or the like used as a piano wire .

On the other hand, the roughness of the surface of the metal plate formed through the illumination forming step S100 can be controlled by variously changing the structure of the wire brush, the rotation speed of the roller, and the like.

Next, a cleaning step (S200) is performed in which the metal plate 110 having surface roughness is cleaned using a volatile organic solvent or the like. The solvent used in such a washing step may be a variety of volatile organic solvents. For example, it is possible to carry out the washing step (S200) using isopropyl alcohol (IPA).

Then, a metal plate attaching step (S300) of attaching the cleaned metal plate 110 to the cylindrical jig R2 is carried out.

The cylindrical jig R2 serves as a support for performing the additional surface treatment process described below on the metal plate 110. The metal jig R2 can be manufactured in various sizes depending on the size of the metal plate 110 and the like.

The circumferential length of the cylindrical jig is preferably an integral multiple of the length of the metal plate wound on the cylindrical jig.

The reason for this is that when the metal plate 110 is wound around the cylindrical jig R2, the end portion B of the metal plate can be attached using a double-sided magnet.

Meanwhile, one or more metal plates may be attached to the cylindrical jig (R2). The circumferential length of the cylindrical jig is determined in consideration of the number of metal plates to be attached to one jig.

Then, a plasma heating step (S400) of heating the surface of the metal plate 110 using a plasma gas is performed while rotating the cylindrical jig with the metal plate 110 attached thereto. The plasma heating step S400 is performed to remove foreign substances present on the surface of the metal plate attached to the cylindrical jig using a plasma flame, and is performed by applying a plasma gas flame (S) at about 6,000 to 7,000 DEG C And a device P1 capable of generating a high-temperature plasma gas flame is used.

Next, a deposition step (S500) of forming a deposition layer (coating layer) using a plasma coater P2 on the surface of the metal plate on which foreign substances present on the surface are removed is performed by using a plasma gas.

In the welding step S500, a mixed powder in which the metal powder and the ceramic powder are mixed is placed in the plasma coater P2 and a high temperature high-pressure flame of about 8,000 DEG C generated inside the plasma coater P2 The metal and ceramic mixture M, which is melted in a predetermined amount and thus melted by the plasma, is deposited on the surface of the metal plate while rotating the cylindrical jig.

Through such a deposition step S500, a deposition layer 121, which is a coating layer, is formed on the surface of the metal plate 110. The deposition layer is formed by adhering to the rough surface of the metal plate formed through the roughing forming step (S100), and the degree of adhesion or the like can be determined according to the roughness formed on the surface of the metal plate through the roughing forming step (S100) have.

Since the roughness is uniformly formed in the edge portion of the metal plate 110, the weld layer can be bonded to the edge portion of the metal plate 110 as well as the center portion of the metal plate 110 with the same adhesive strength.

The metal powder used in the welding step S500 is an alloy powder in which nickel and aluminum are mixed. The ceramic powder is composed of alumina (Al ₂ O ₃ ) and titania (TiO ₂ ) in a weight ratio of 6: 4 to 7: 3 Mixed. The deposition layer is formed by dissolving the mixed powder in the plasma coater P2 and then plasma spraying the same outside the plasma coater P2.

At this time, it is possible to precisely control the thickness of the deposition layer formed on the surface of the metal plate by controlling the supply amount of the mixed powder, the injection pressure of the plasma flame, the rotation speed of the cylindrical jig (R2) Through this method, it is possible to reduce the thickness error of the deposited layer formed on the metal sheet to within 1 탆.

Thereafter, a metal plate separating step (S600) for separating the metal plate 120 attached to the cylindrical jig (R2) and having the deposited layer formed thereon from the cylindrical jig (R2) is performed.

The metal plate separating step S600 may be performed by removing the two-sided magnet used in the metal plate applying step S300.

As such, there may be more than one metal plate 120 separated from the cylindrical jig R2.

The surface of the metal plate 120 may be cooled before the metal plate separating step S600, and cooling may be performed by spraying a cooling air spray. Such a cooling step may be omitted.

Next, a surface planarization step (S700) for flattening the surface of each of the separated metal plates 120 on which the deposition layer is formed is performed.

The surface smoothing step S700 may be performed using a cylindrical roller R3.

The surface smoothing step S700 is performed to remove the irregularly protruding portion 122 when the deposition layer is formed.

If the protruded portion 122 is left on the surface of the metal plate, a printing failure itself may be caused.

Thereafter, the coating liquid (C1) containing the abrasion-resistant material, the heat-resistant material and the thermosetting material is put on the surface of the metal plate 120 'having the surface flattened in this manner and the liquid coating is performed by spraying the coating liquid (S800) for lowering the illuminance of the substrate. As the wear resistant material, silica and the like can be used, and as the heat resistant material, alkaline silicic acid can be used. As the thermosetting material, various thermosetting epoxy resins can be used.

3 is a cross-sectional schematic diagram of a metal plate showing stepwise changes in the state of one surface of the metal plate in each step of the surface treatment method of the metal plate for cylinder jacket of the offset printing apparatus of the present invention.

Referring to FIG. 3, when roughness is formed on the surface of the metal plate 100 using a wire brush, it is possible to form a uniform roughness not only on the central portion 112 of the metal plate but also on the rim portion 111 of the metal plate.

The metal plate 120 on which the deposition layer 121 is formed is formed by spraying the mixed powder of the metal powder and the ceramic powder on the surface of the metal plate with the plasma coating, The protrusions 122 existing in the planarization step are planarized through the planarization step. On the other hand, a large number of voids remain on the surface of the planarized metal plate 120 ', and a coating layer 131 is formed on the deposition layer 121 to fill the gap and impart hydrophobicity to the surface of the metal plate. The final metal plate 130 for the offset printing apparatus cylinder jacket can be manufactured.

The surface-treated metal plate 130 can be used as a jacket to which various cylindrical tanks provided on the offset printing apparatus are attached.

S100: illumination forming step S200: washing step
S300: metal plate attaching step S400: plasma heating step
S500: deposition step S600: metal plate separation step
S700: surface planarization step S800: liquid phase coating step
WB: Wire brush R1: Rough forming roller
R2: Cylindrical jig R3: Cylindrical roller
B: End portion of the metal plate S: Plasma gas flame
M: Metal and ceramic mixture P1: Plasma flame generator
P2: Plasma coating machine C: Liquid coating machine
C1: liquid coating liquid 100: metal plate
101: roughness forming layer 110: metal plate
120: metal plate 120 ': metal plate
121: deposition layer 122: protruding part
130: metal plate 131: coating layer

Claims (11)

A roughness forming step of forming roughness on the surface of the metal plate;
A cleaning step of cleaning a metal plate on which surface roughness is formed;
A metal plate attaching step of attaching the cleaned metal plate to a cylindrical jig;
A plasma heating step of removing foreign matter present on a surface of a metal plate attached to the cylindrical jig using a plasma flame;
A deposition step of depositing a mixed powder of a metal powder and a ceramic powder on the surface of the metal plate to form a deposition layer;
A metal plate separating step of separating the metal plate from the cylindrical jig;
A surface planarization step of planarizing the surface of the metal plate; And
And a liquid coating step of lowering the roughness of the metal sheet by performing a liquid coating using a coating liquid containing a wear resistant material, a heat resistant material and a thermosetting material on the surface of the metal plate,
Wherein the roughness forming step uses a scratching phenomenon by a wire brush by rotating a cylindrical roller having a wire brush on the surface thereof. delete The method according to claim 1,
Wherein the cleaning step uses a volatile organic solvent. The method according to claim 1,
Wherein the step of adhering the metal sheet is performed by a method of bonding the ends of the metal sheet to each other with a double-sided magnet. The method according to claim 1,
Wherein the step of attaching the metal plate is performed by attaching a plurality of metal plates to one cylindrical jig in succession. The method according to claim 1,
Wherein the plasma heating step is performed by applying a plasma gas flame at 6,000 to 7,000 DEG C while rotating the cylindrical jig. The method according to claim 1,
Wherein the deposition is performed by placing the mixed powder in a plasma coater and dissolving the mixed powder in a high-pressure flame of 7,000 to 9,000 DEG C generated inside the plasma coater, thereby spraying the mixed powder to the outside. The surface of the metal plate for a cylinder jacket Processing method. The method according to claim 1,
Wherein the thickness of the welding layer formed by the welding step is controlled by adjusting the supply amount of the mixed powder, the spraying pressure of the plasma flame, or the rotating speed of the cylindrical jig. The method according to claim 1,
Wherein the metal powder is an alloy powder in which nickel and aluminum are mixed at a weight ratio of 90:10 to 95: 5. The method according to claim 1,
Wherein the ceramic powder is a mixture of alumina (Al ₂ O ₃ ) and titania (TiO ₂ ) in a weight ratio of 6: 4 to 7: 3. The method according to claim 1,
Wherein the surface smoothing step is performed using a cylindrical roller.

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