KR101901531B1 - Post-processing method of a printing cylinder for reuse - Google Patents

Abstract

The present invention relates to a post-processing method for reuse of a printing cylinder, comprising: (A) a peeling step of peeling off an existing printed coating film of a printing cylinder (10) used for printing; (B) a step of cleaning the printing cylinder from which the existing printed coating film is removed in the step (A); (C) a degreasing step of putting the printing cylinder, of which a surface is cleaned in the step (B), into an electrolyte solution and removing various kinds of organic matters remaining on the surface of the printing cylinder by electrolysis; (D) a glass layer forming step of forming a silver film on the surface of the printing cylinder by an electroless plating method of dipping the printing cylinder degreased in the step (C) in film developing waste water and rotating the same; (E) a primary plating step of forming an inner skin of a printed coating film by plating nickel on the silver film of the printing cylinder performing the step (D) by electrolysis; and (F) a secondary plating step of forming an outer skin of the printed coating film by plating copper on the inner skin of the printing cylinder performing the step (E). The post-processing method for reuse of a printing cylinder according to the present invention is advantageous in that quality of a printed coating film is dynamically improved since a silver film is formed after a surface of a printing cylinder is degreased by electrolysis. Also, a glass layer forming process of forming a silver film can be performed with low costs more easily and quickly, and a glass layer is formed before nickel is plated, thereby facilitating peeling of a printed coating film for reproduction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post-processing method for reusing printing cylinders,

The present invention relates to a post-processing method for reusing a printing cylinder, and more particularly, to a post-processing method for reusing a printing cylinder in which a printing cylinder is peeled, washed, degreased, The electroless plating is performed by the film development wastewater before the nickel plating to reduce the consumption of the film wastewater used for the electroless plating and to improve the work process, To a post-treatment method for reusing a printing cylinder capable of preventing the deterioration of a printing material.

In general, if the types of printing are classified according to the method of applying the printing pressure, they can be grouped into a pressing type, an abutment type, and a rotary type. When classified according to the plate type of the printing plate, In recent years, a printing technique that does not require a separate pressing plate such as electronic printing has been proposed.

Here, the concave printing is a printing method in which the printed portion, that is, the corrugated portion is recessed in the printing plate so that the ink remains only in the corrugated portion, and is divided into two methods of engraving concave printing and gravure printing.

Among them, gravure printing is another example of a photo engraving printing method in which a printing plate is formed by a screen used in photolithography, and in particular, a gravure printing method in a rotary manner will be briefly described as follows.

First, the surface of the printing cylinder is well organized, and a photosensitive liquid is applied on the surface. Then, the film manuscript is wound around a cylinder and light-shined to develop a film-like shaped portion on the cylinder. Then, the cauline part is dissolved in the caustic solution to make it concave. These etch processes have recently been replaced by laser engraving. After the ink is applied onto the printing cylinder having the concave line portion, ink on the entire surface of the cylinder except the line portion is removed. Then, turn the printing cylinder and print the shape of the hot wire portion on the printing paper as it is.

In order to reuse the printing cylinder used for printing once, it is necessary to peel off the printing coat film on the surface and to plate the new printing coat. As an example of a post-treatment method for reusing the printing cylinder, No. 10-0831075 (reference). The post-treatment method includes a peeling step of peeling off an existing print film of a printing cylinder used for printing, a cleaning step of cleaning the printing cylinder from which the existing printing coating film has been removed in the peeling step, A step of removing the organic substances remaining on the surface of the printing cylinder by an electrolytic method by putting the printing cylinder into an electrolytic solution; a step of plating nickel on the surface of the printing cylinder degreased in the degreasing step by electrolysis, A glass layer forming step of forming a silver film on the inner film by an electroless plating method in which the printing cylinder having an inner film formed on its surface is immersed in film developing wastewater and rotated in the primary plating step, Copper is formed on the silver film formed in the glass layer forming step, The secondary plating to form a shell; that comprising the features.

However, in the post-treatment method of the reference document, since a glass layer is formed on the inner surface of the printing cylinder by electroless plating in which nickel is plated on the surface of the printing cylinder to form an inner surface of the printed coating film, There is a difficulty in peeling the printed coating film.

Reference literature: Patent No. 10-0831075

Accordingly, it is an object of the present invention to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method and apparatus for forming a glass layer on a surface of a printing cylinder used for printing, The present invention provides a post-processing method for reusing a printing cylinder in which peeling of a printed coating film for subsequent reproduction is facilitated by performing copper plating.

In addition, the present invention makes it possible to utilize the electrolytic method in the degreasing step before nickel and copper plating, thereby effectively removing various contaminants on the surface of the printed silane, thereby preventing deterioration of the quality of the printed coating caused by contaminants, The present invention also provides a post-treatment method for reusing a printing cylinder capable of reducing the production cost by reducing electroless plating of the printing cylinder, improving the working environment, reducing the number of working hours, and improving the productivity. .

In order to solve such a technical problem,

(A) a peeling step of peeling off the existing print film of the printing cylinder 10 used for printing; (B) washing the printing cylinder from which the existing printing film is removed in the step (A); (C) a degreasing step of putting the printing cylinder whose surface has been washed in the step (B) into an electrolytic solution and removing various organic substances remaining on the surface of the printing cylinder by electrolysis; (D) a glass layer forming step of forming a silver film on the surface of the printing cylinder by an electroless plating method in which the printing cylinder defatted in the step (C) is immersed and rotated in film developing wastewater; (E) a first plating step of plating nickel on the silver film of the printing cylinder that has undergone the step (D) by electrolysis to form an inner skin of the printed coating; And (F) a second plating step of plating the copper on the inner surface of the printing cylinder which has been subjected to the step (E) to form an envelope of the printing coating film. to provide.

In the step (B), the surface of the printing cylinder 10 from which the printing coating film 20 is removed is wiped clean with water, A pickling step of wiping the surface of the printing cylinder using a solution, a step of wiping the surface of the printing cylinder with a paper, and a second washing step of wiping the surface of the printing cylinder with water.

(G) performing the step (F), and reusing and washing the regenerated printing cylinder; (H) a glass layer forming step of forming a silver film on an outer surface of a printing cylinder performing the step (G); And (I) a third plating step of plating copper on the silver film of the printing cylinder which has been subjected to step (H) to form an outer covering.

(J) removing various kinds of organic matter remaining on the surface of the envelope (50) of the printing cylinder before the step (G) and after the step (H); And (K) washing the silver film surface of the printing cylinder before the step (I) after the (H) step.

Since the post-treatment method for reusing the printing cylinder according to the present invention forms a silver film after degreasing the surface of the printing cylinder by the electrolytic method, the quality of the printed coating can be greatly improved, Can be performed more simply and quickly at low cost, and the glass layer is formed first before nickel plating, which makes it easy to peel off the printed coating film for subsequent regeneration.

In addition, the present invention can degrade various pollutants on the surface of printed silane by degreasing using electrolytic method before nickel and copper plating, thereby preventing the deterioration of the quality of the printing film caused by the contaminants, The work environment can be improved, and the productivity can be improved by reducing the work flow.

1 is a flowchart of a post-process for reusing a printing cylinder according to the present invention.
Fig. 2 is a partial front sectional view of the printing cylinder schematically showing the peeling step of Fig. 1; Fig.
Fig. 3 is a partial front sectional view of the printing cylinder schematically showing the cleaning step of Fig. 1; Fig.
4 is a partial front sectional view of the printing cylinder schematically showing the degreasing step of FIG.
Fig. 5A is a partial top cross-sectional view of a printing cylinder having an inner film formed by the primary plating step of Fig.
Fig. 5B is a view schematically showing the primary plating step of Fig. 1. Fig.
Fig. 6A is a partial front sectional view of a printing cylinder in which a silver film is formed on the inner film by the glass layer forming step of Fig. 1; Fig.
FIG. 6B is a view schematically showing the glass layer forming step of FIG. 1. FIG.
7A is a partial front sectional view of a printing cylinder in which an envelope is formed on the silver film by the secondary plating step of FIG.
FIG. 7B is a view schematically showing the secondary plating step of FIG. 3; FIG.
Figs. 8 and 9 are additional process flow charts for use reuse of a printing cylinder reproduced through a post-processing process according to the present invention.
Fig. 10 is a partial top cross-sectional view of a printing cylinder in which an additional envelope is formed according to a further process for reuse of Figs. 8 and 9. Fig.

Hereinafter, a post-processing method for reusing a printing cylinder according to the present invention will be described in detail with reference to the accompanying drawings.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Referring to FIG. 1, a post-processing method for reusing a printing cylinder according to the present invention is a printing method in which a printing cylinder used in a rotary press is repeatedly used, A peeling step S10, a cleaning step S20, a degreasing step S30, a glass layer forming step S40, and a primary printing step A plating step S50 and a secondary plating step S60.

Hereinafter, each step of the present invention will be described in detail.

The peeling step S10 is a step of peeling off the existing print film 20 attached to the surface layer of the printing cylinder 10 already used for printing according to FIG. The coating film 20 is peeled off manually by peeling.

At this time, the envelope of the printed coating film 20 is made of copper so as to be easy to process a wire portion representing a print pattern by etching with a corrosive liquid or laser cutting, and an inner surface of the inner surface of the printing coat film 20 is covered with a surface of a printing cylinder 10 And is made of nickel so that the copper shell, which is not adhered well, adheres well to the surface of the printing cylinder 10.

At this time, the surface is polished to a depth of 500 to 1000 mu m on the surface so that copper and nickel can be sufficiently removed when peeling the existing printed coating film 20. [

3, the cleaning step S20 is a step of cleaning the surface of the printing cylinder 10 from which the printing coat 20 has been removed in the peeling step S10, more specifically, the first washing step S21, , A pickling step (S22), and a second washing step (S23).

At this time, the first water washing step S22 is a step of wiping the surface of the printing cylinder 10 from which the printed coating film 20 has been removed in the peeling step S10 with water (water), and the pickling step S24 The surface of the printing cylinder 10 is wiped with a sulfuric acid solution of 6 to 8%, and the second washing step S28 is a step of wiping the surface of the picked-up printing cylinder 10 with water .

At this time, after the pickling step S24, the step of wiping the surface of the printing cylinder 10 with paper (S26) may be further included.

The degreasing step S30 is a step of dipping the printing cylinder 10 into the electrolyte solution 70 and removing various organic substances remaining on the surface by the electrolytic solution as shown in FIG. It is possible to remove various organic substances remaining on the surface, thereby preventing deterioration of the quality of the printing coating film caused by the contaminants.

This is because the electrolyte 70 is filled in the electrolytic bath 71 and the printing cylinder 10 and the SUS plate 60 are immersed in the electrolytic solution 70. Then the anode is attached to the printing cylinder 10 and the SUS- And the cathode is electrolyzed by hanging it. At this time, an alkali aqueous solution is generally used as the electrolytic solution (70).

Of course, it is preferable that the removal of various organic substances remaining on the surface of the printing cylinder 10 is completed through the degreasing step (S30), then pickling and washing with water, and then the next step is performed.

5A, the glass layer forming step S40 is a step of forming a glass layer on the surface of the printing cylinder 10 by the electroless plating method in which the printing cylinder 10 subjected to the degreasing step S30 is immersed in the film developing wastewater 80 and rotated The silver film 30 is coated on the surface of the printing cylinder 10 so that the printing film can be easily separated from the surface of the printing cylinder 10 when peeling off the printing cylinder 10 for reusing the printing cylinder 10 .

In more detail, the silver film 30 is formed on the surface of the printing cylinder 10 in which the silver component dissolved in the film developing wastewater 80 is iron, using the film developing wastewater 80, Is released from the surface of the printing cylinder (10) and can be easily peeled off. 5B, the silver component in the film developing wastewater 80 is removed by the electroless plating method for about 3 minutes in which the printing cylinder 10 is rotated in a state of being immersed in the film developing wastewater 80 by about 43% And the silver film 30 is formed on the surface of the printing cylinder 10 made of iron.

Of course, it is preferable that the silver film 30 is formed on the surface of the printing cylinder 10 through the glass layer forming step (S40), followed by washing with water, and then the next step is performed.

6A, nickel is plated on the silver film 30 formed on the surface of the printing cylinder 10 through the step S40 to form the inner film 40 of the print film 20 . Nickel is plated on the inner film 40 of the printed coating film 20 to bond the outer film 50 and the printing cylinder 10 through the copper film forming the outer film 50 of the printed coating film 20 and the printing cylinder 10 made of iron. ). ≪ / RTI >

At this time, nickel plating on the surface of the printing cylinder 10 is carried out by electrolysis as shown in Fig. 6B. This is because the electrolyte 90 is filled in the plating bath 91 and the nickel plate 92 and the printing cylinder 10 are immersed in the electrolyte 90 and then the positive electrode is attached to the nickel plate 92, The negative electrode is electrolyzed to perform nickel plating. At this time, plating may be performed using a strike nickel plating method so as to increase the adhesion and the covering power of the nickel plating film.

The reason why nickel is firstly plated on the printing cylinder 10 without performing the copper plating first is that it is impossible to directly coat the surface of the iron cylinder with copper, which is excellent in corrosion resistance and machinability.

Of course, it is preferable to form the inner skin 30 through the primary plating step S50, then pickle and wash, and then carry out the next step.

The secondary plating step S60 is a step of plating the copper on the inner surface 40 formed in the primary plating step S50 according to FIG. 7A to form the outer covering 50 of the printed coating film 20, The electrolytic solution 100 is filled in the plating bath 101 and the printing cylinder 10 and the bulbous cores 102 are immersed in the electrolytic solution 100 as shown in FIG. An anode is attached to the noble metal 102 and a cathode is attached to the printing cylinder 10 to supply electric power. An electrolysis is performed to form a sheath 50 made of copper on the inner wall 40 made of nickel of the printing cylinder 10 .

A new print film 20a is formed on the surface of the printing cylinder 10 and the printing cylinder 10 in which the printing film 20a is newly formed is subjected to etching or sculpture so that a desired printing pattern is newly formed on the printing film 20a It can be reused for printing by engraving.

8 and 9 are additional process flow charts for the post-use reuse of the printing cylinder reproduced through the post-process according to the present invention. This is an additional post-treatment process so that a printing operation can be performed using the printing cylinder reproduced through the post-treatment process of FIG. 1 and then reused.

8, a cleaning step S110, a glass layer forming step S120, and a glass layer forming step S120 are performed to reuse (S100) the regenerated printing cylinder 10 through the secondary plating step S60 of FIG. , The third plating step (S130) may be performed and reused. FIG. 9 further performs the defatting step (S112) after the cleaning step (S110) and further performs the cleaning step (S122) after the glass layer forming step (S120) in FIG. 10, a silver silver layer 60 and a sheath 70 may be further formed on the copper-covered sheath 50. As shown in FIG.

The washing step (S110) is a step of washing after reuse step (S100) so as to be usable again, in the same manner as the washing step (S20) of FIG.

The glass layer forming step S120 is a step for forming the silver film 60 on the outer surface 50 of the printing cylinder 10 and is a step for forming the printing cylinder 10 in the same manner as the glass layer forming step S40 in Fig. The silver film 60 is formed on the outer surface 50 of the printing cylinder 10 by the electroless plating method in which the film is immersed in the developing wastewater and rotated.

The third plating step S60 is a step of plating the copper on the silver film 60 formed through the glass layer forming step S120 to form the outer cover 70. The glass layer forming step S40 and the glass layer forming step S40 of FIG. The same goes.

9, after the cleaning step S110, the degreasing step S112 may be further performed to remove various organic substances remaining on the surface of the envelope 50 of the printing cylinder 10, Deg.] (S30).

After the glass layer forming step S120, the cleaning step S122 may be further performed to clean the surface of the silver film 60 of the cylinder 10, which is performed in the same manner as the cleaning step S20 of FIG. 1 .

8 to 10, a new envelope 70 is formed on the surface of the printing cylinder 10, and a desired printing pattern is newly formed by etching or sculpting, thereby being reused in a printing operation can do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary,

10: printing cylinder 20, 20a:
30: silver film 40:
50: envelope 52:
54: envelope 60: SUS plate
70: electrolyte 80: film development wastewater
90: electrolyte

Claims (4)

(A) a peeling step of peeling off the existing print film of the printing cylinder 10 used for printing;
(B) cleaning the printing cylinder 10 from which the existing printing film is removed in the step (A);
(C) a degreasing step of putting the printing cylinder 10 whose surface has been cleaned in the step (B) in an electrolytic solution and removing various organic substances remaining on the surface of the printing cylinder 10 by electrolysis;
(D) forming a silver film (30) on the surface of the printing cylinder (10) by an electroless plating method in which the printing cylinder (10) degreased in the step (C) is immersed and rotated in film developing wastewater;
(E) a first plating step of plating nickel on the silver film 30 of the printing cylinder 10, which has been subjected to the step (D), by electrolysis to form an inner film 40 of the printed film; And
(F) a second plating step of plating the copper on the inner surface of the printing cylinder (10) of step (E) to form the envelope (50) of the printing coat;
(G) performing the cleaning and reusing of the regenerated printing cylinder 10 by performing the step (F);
(H) a glass layer forming step of forming a silver film 52 on the outer surface 50 of the printing cylinder 10 performing the step (G); And
(I) a third plating step of plating copper on the silver film 52 of the printing cylinder 10 that has undergone the above step (H) to form a covering 54,
(J) removing various kinds of organic matter remaining on the surface of the envelope (50) of the printing cylinder (10) before the step (G) and after the step (H); And
(K) cleaning the surface of the silver film (52) of the printing cylinder (10) after the (H) and before the (I) Way.
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