KR20020021750A - Apparatus for treating aluminum sheet continually and electrochemically and its method - Google Patents

Abstract

PURPOSE: A continuous electrochemical treating apparatus of aluminum sheets and a method thereof are provided to manufacture an original printing plate having a high plate wear during off-set printing or rotary printing by uniforming the surface of aluminum using electrolytic polishing when coating synthetic resin or photosensitizer. CONSTITUTION: The continuous electrochemical treating apparatus of aluminum sheets in which the surface of the aluminum sheets(11) is polished comprises a reaction vessel(12) in which an electrolyte is stored; transfer rollers(13) which are installed in the reaction vessel(12) so as to transfer the aluminum sheets(11); graphite electrodes(14) which are installed at the upper part of the transfer rollers(13) so that the electrodes(14) are spaced apart from the transfer rollers(13) in an appropriate distance; supports(15) which are installed between the transfer rollers(13) so that the supports(15) are spaced apart from the transfer rollers(13) in an appropriate distance so as to support the aluminum sheets(11) transferred; a circulation pump(18) which circulates an electrolyte of the reaction vessel(12); a feedback passage(16) which returns the electrolyte circulated by the circulation pump(18) to the reaction vessel(12); a power supply part(10) which supplies an AC power to the electrodes(14); and a cooler(17) which cools the electrolyte that is returned to the reaction vessel(12) by the circulation pump(18) so as to reuse the cooled electrolyte.

Description

Apparatus for treating aluminum sheet continually and electrochemically and its method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical continuous processing apparatus and processing method for an aluminum sheet mainly used as a printing plate, and more particularly, aluminum processed in a sheet state when a synthetic resin or a photosensitive agent is applied to an aluminum sheet surface. In order to strengthen the adhesion between the sheet and the coating material, the surface of aluminum is uniformized using electrolytic polishing to produce a printing disc having high printing strength when printed using off-set printing and a rotary printing machine. The present invention relates to an electrochemical continuous processing apparatus and method for treating an aluminum sheet.

In general, it is well known that printing plates used in off-set printing and rotary printing machines are used to process the surface of an aluminum sheet having a suitable thickness.

In addition, there is a problem in that the processing of the aluminum surface used as the printing original plate is inadequate, the oxide film treatment is inferior, and the durability is lowered, thereby shortening its lifespan.

In addition, existing web type devices (Japanese Patent Publication No. 49-56834, Japanese Patent Publication No. 54-41992, Japanese Patent Publication No. 49-56833, Japanese Patent Publication No. 51-7081, and Japanese Patent Publication) No. 47-44046, Japanese Patent Publication No. 52-1333838, Japanese Patent Publication No. 47-30403 and US Patent 3,632,486, etc.) is a large-scale facility for continuously processing the original wound in roll form. There was a problem that can not quickly produce an aluminum sheet cut to the required specifications.

Therefore, in Korean Patent No. 119286 (Printable Disc Automatic Surface Treatment Apparatus and Method), it was proposed to continuously process the surface of the printed disc.

It comprises a first polishing means consisting of a cam and a cam follower capable of sliding the brush roll from side to side and a motor for rotating them,

A washing device for washing the printed disc passed through the first polishing means;

A treatment tank for removing foreign substances by alkali and acid treatment of the printing disc passed through the water washing device;

A second polishing means capable of electropolishing to improve the smoothness of the printing disc passed through the treatment tank;

A washing device for washing the printed disc passed through the first and second polishing means,

A treatment tank for removing foreign substances by alkali and acid treatment of the printing disc passed through the water washing device;

An oxide film treatment tank for improving the surface hardness of the printing disc passed through the treatment tank;

A hydrophilic treatment tank for washing the printed disc passed through the anodizing tank and removing foreign matters of the pores formed in the pores of the cells surface-treated in the previous step;

It is provided with a spray device for forming a mat on the printing disk after applying the photosensitive liquid to the printing disk passed through the hydrophilic treatment tank,

After washing the printing disc through the first polishing means with sodium hydroxide solution and washing with water,

After chemical polishing with nitric acid solution, the second polishing means was continuously supplied with hydrochloric acid having a concentration of 1% to 5% in an amount of 20 l / sec to 30 l / sec, and electrolytic polishing by maintaining the temperature of the treatment tank at 20 ° C to 24 ° C. After washing,

After whitening with sodium hydroxide solution, chemical surface polishing with nitric acid solution, and then supplying sulfuric acid with 10% to 30% concentration of sulfuric acid in the amount of 30ℓ / sec to 50ℓ / sec as electrolyte solution, the temperature of treatment tank is 20 to 30 Maintained at ℃, anodized, hydrophilized after coated,

After drying, the surface treatment was performed by coating with a photosensitive agent and curing after drying.

However, the conventional printing disc automated surface treatment apparatus and method thereof are for continuously processing the original wound in the form of a roll, it is not possible to quickly produce a sheet-shaped aluminum sheet cut to the required specifications by the requirements of the user In order to meet the order quantity, there were disadvantages such as replacing the roll of the printing plate or processing more printing plates than necessary.

The present invention is to improve the problems according to the conventional electrolytic polishing method as described above, when applying a synthetic resin or a photosensitive agent on the surface of the aluminum sheet electrolytic lead to strengthen the adhesion between the aluminum sheet processed in the sheet state and the coating material Provides electrochemical continuous processing apparatus and processing method of aluminum sheet to make printing disc with high printing strength when printing by using offset-set printing and rotary printing machine by homogenizing the surface of aluminum by using magic. Its purpose is to.

The present invention is an electrochemical continuous treatment apparatus of the aluminum sheet of the present invention for achieving the above object is an apparatus for polishing using the electrolysis method of the surface of the aluminum alloy is a reaction tank in which the electrolyte is stored;

A feed roller installed in the reaction tank for transferring the aluminum sheet;

A circulation pump for circulating the electrolyte in the reaction tank,

A feedback passage for returning the electrolyte circulated by the circulation pump to the reaction tank,

Comprising of the power supply for supplying AC power to the electrode to process the aluminum sheet used in the offset printing or rotary printing press,

The electrochemical continuous treatment method of the aluminum sheet is a degreasing process for removing the rolling oil on the surface of the aluminum sheet having a predetermined thickness of the sheet form;

A polishing step of polishing the surface of the aluminum sheet to 0.5 to 2 탆 using an electrolysis method,

A first washing step of washing the aluminum sheet whose surface is polished with water having a predetermined temperature,

Desmut process to remove the abrasive residue on the aluminum sheet using a spray nozzle,

A second washing step of washing with water having a predetermined temperature,

An oxide film forming step of forming an oxide film on the surface of the aluminum sheet,

A third washing step of washing the aluminum sheet with water having a predetermined temperature;

A hole forming step of forming a hole of minute size on the surface of the aluminum sheet;

A fourth washing step of washing with water using a water having a predetermined temperature,

A drying step of drying the aluminum sheet,

By performing a photoresist coating process for coating a photoresist on the surface of the aluminum sheet, it is possible to produce a printing disc having a high printing force when printing using an offset-set printing and a rotary printer.

1 is a cross-sectional view showing a configuration for polishing the surface of the aluminum sheet according to an embodiment of the present invention.

Figure 2 is a perspective view showing the configuration of the transfer roller of the present invention.

3 is a schematic view showing a structure for forming an oxide film of the present invention;

4 is a perspective view showing in detail part of the configuration for forming an oxide film of the present invention;

Explanation of symbols on the main parts of the drawings

10, 20: power supply unit 11: sheet aluminum sheet

12, 21: reactor 13, 22: feed roller

14, 23: electrode 15, 24: stand

16, 25: feedback passage 17, 26: cooler

18, 28: circulation pump 28: supply passage

30: discharge hole

The configuration and processing method of the electrochemical continuous processing apparatus of the aluminum sheet according to the present invention will be described in detail through the embodiment of the present invention.

1 is a cross-sectional view of the surface polishing treatment apparatus of the aluminum sheet according to the present invention, Figure 2 is a perspective view showing the shape of the feed roller in the surface polishing treatment apparatus.

3 is a block diagram showing an oxide film forming apparatus in the surface polishing treatment apparatus of the aluminum sheet according to the present invention.

The printing plate processing method according to the present invention comprises a degreasing step for removing the rolling oil on the surface of the sheet-shaped aluminum sheet 11 of a predetermined thickness, that is, 0.15 to 0.4 mm,

A polishing step of polishing the surface of the aluminum sheet 11 using an electrolysis method of about 0.5 to 2 μm,

A first washing step of washing the surface-polished aluminum sheet 11 with water having a predetermined temperature, that is, a temperature of 50 to 60 캜, and

Desmut process for removing the abrasive residue on the aluminum sheet 11 by using a spray nozzle,

A second washing step of washing the aluminum sheet 11 with water having a temperature of 50 to 60 ° C.,

An oxide film forming step of forming an oxide film on the surface of the washed aluminum sheet 11,

A third washing step of washing the aluminum sheet 11 having the oxide film formed therein with water having a temperature of 50 to 60 ° C.,

A hole forming step of forming a hole of minute size in the surface of the washed aluminum sheet 11,

A fourth washing step of washing the aluminum sheet 11 with water using water having a temperature of 50 ° C. to 60 ° C.,

A drying step of drying the washed aluminum sheet 11,

It is to be performed by a photosensitive agent coating process for coating a photosensitive agent on the surface of the aluminum sheet (11).

Here, the solution used for said degreasing process is an alkaline solution, The component is sodium hydroxide (NaOH) of about 10%-about 20% of concentration.

The solution for the dismart process is a sodium hydroxide (NaOH) solution having a concentration of about 20% to 30%.

The apparatus for polishing the surface of the aluminum sheet 11 using an electrolysis method includes a reaction tank 12 in which an electrolyte is stored, as shown in FIGS. 1 and 2,

A feed roller 13 installed in the reaction tank 12 to transfer the aluminum sheet 11,

Electrodes 14 are provided at an appropriate interval on the upper portion of the feed roller 13,

Pedestal 15 for supporting the aluminum sheet 11 is installed and transported at an appropriate interval between the transfer roller 13 and,

A circulation pump 18 for circulating the electrolyte solution of the reactor 13,

A feedback passage 16 for returning the electrolyte circulated by the circulation pump 18 to the reaction tank 12,

It consists of a power supply unit 10 for supplying AC power to the electrode (14).

Here, the component of the electrolyte solution is hydrochloric acid (HCl) or nitric acid (HN0 ₃ ), and is therefore an acidic solution.

In addition, the electrode 14 is made of graphite (carbon).

The electropolishing apparatus thus made oxidizes the entire surface of the plate by the AC power supplied through the electrode 14 to finely polish the surface of the aluminum sheet to be transferred to a size of 0.5 to 2 탆.

And since the temperature of the electrolyte in the reaction tank 12 increases as the reaction time elapses, the circulation pump 18 is driven to cool through the cooler 17 and reused.

On the other hand, the conveying roller 13 is designed to smoothly convey the aluminum sheet 11 in the reaction tank 12 by rotating as shown in the figure.

In the oxide film treatment apparatus, as shown in FIG. 3, the reaction tank 21 in which the electrolyte is stored,

A feed roller 22 installed in the reaction tank 21 for transferring the aluminum sheet 11,

An electrode 23 provided at an appropriate interval on the upper portion of the feed roller 22;

A pedestal 24 supporting the aluminum sheet 11 which is installed and conveyed at an appropriate interval between the feed rollers 22, and

A circulation pump 27 for circulating the electrolyte solution of the reaction tank 21,

A cooler 26 for cooling the electrolyte circulated by the circulation pump 27,

A feedback passage 25 for returning the electrolyte solution cooled by the cooler 26 to the reaction tank 21;

A supply passage 28 for spraying the electrolyte solution fed back through the feedback passage 25 on the upper surface of the aluminum sheet 11 being transferred through the discharge hole 29;

It consists of a power supply unit 20 for supplying a DC power to the electrode 23.

Here, the component of the electrolyte solution is sulfuric acid, and therefore an acid solution.

In addition, the electrode 23 and the transfer roller 22 is formed of stainless steel.

The oxide film processing apparatus and processing method thus formed form an oxide film having a thickness of 1.5 to 2.5 μm by using a direct current power source supplied through the electrode 23 to the surface of the aluminum sheet to be transferred.

Since the temperature of the electrolyte in the reaction tank 21 increases as the reaction time elapses, the circulating pump 27 is driven to cool the coolant through the cooler 26 and reused.

In the electrochemical continuous treatment of the aluminum sheet of the present invention configured as described above, first, the rolling oil is removed from the surface of the sheet-shaped aluminum sheet 11 having a thickness of 0.15 to 0.4 mm by a degreasing process.

In the above degreasing step, sodium hydroxide (NaOH) at a concentration of about 10% to 20% of the alkaline solution is used.

In the polishing process in which the rolled oil is removed from the aluminum sheet 11, the surface is polished using an electrolysis method of about 0.5 to 2 μm.

In the polishing process, the feed roller 13 is installed in the reaction tank 12 in which the electrolyte is stored, so that the aluminum sheet 11 is smoothly transferred by rotation while being supported by the pedestal 15.

And the surface of the aluminum sheet 11 by electrolysis through the electrode 14 made of graphite (carbon) and is supplied with an AC power from the power supply unit 10 is installed at a suitable interval on the upper portion of the feed roller (13) It is finely polished to a size of 0.5 to 2㎛ while oxidizing as a whole.

The electrolyte stored in the reaction tank 12 is circulated to the circulation pump 18 and returned to the reaction tank 12 via the feedback passage 16.

As the electrolyte solution stored in the reaction tank 12, a solution having an acidic component of hydrochloric acid (HCl) or nitric acid (HN0 ₃ ) is used.

In addition, since the temperature of the electrolyte in the reaction tank 12 increases as the reaction time elapses, the electrolyte is driven through the circulation pump 18 to be cooled by the cooler 17 and reused.

A first washing step of washing the surface-polished aluminum sheet 11 during the polishing step using water having a predetermined temperature, that is, a temperature of 50 to 60 ° C., and

In the dismart process using the spray nozzle, the polishing residues on the aluminum sheet 11 are removed.

In the second washing step using water having a temperature of 50 to 60 ° C, the aluminum sheet 11 is washed again.

An oxide film is formed on the surface of the washed aluminum sheet 11 through an oxide film forming step.

That is, as shown in FIG. 3, the aluminum sheet 11 is transferred from the feed roller 22 installed in the reaction tank 21 in which the electrolyte is stored.

Supporting the aluminum sheet 11 is transported by the pedestal 24 installed at a suitable interval between the transfer roller 22 to enable a stable transfer.

An oxide film having a thickness of 1.5 to 2.5 μm is formed on the surface of the aluminum sheet 11 while receiving DC power from the outside from the electrode 23 made of stainless steel at an appropriate interval on the upper portion of the feed roller 22. do.

The electrolyte of the reaction tank 21 is circulated by the circulation pump 27 and cooled while passing through the cooler 26, and then returned to the reaction tank 21 through the feedback passage 25.

The electrolyte returned through the feedback passage 25 is sprayed on the upper surface of the aluminum sheet 11 being transferred through the discharge hole 29 of the supply passage 28 so that an oxide film is formed on the surface.

The acidic solution of sulfuric acid is used as a component of said electrolyte solution.

The aluminum sheet 11 being transferred is washed with water again through a third washing process using water having a temperature of 50 to 60 ° C.

A hole having a minute size is formed through a hole forming process on the surface of the aluminum sheet 11 on which the oxide film is formed.

The aluminum sheet 11 being transferred is washed with water again through a third washing process using water having a temperature of 50 to 60 ° C.

After drying the washed aluminum sheet 11, the photosensitive agent is coated on the surface of the aluminum sheet 11 through a photosensitive agent coating process.

The electrochemical continuous processing apparatus and processing method of the aluminum sheet according to the present invention made as described above provides an effect of extending the durability of the aluminum printing plate used for off-set printing and rotary printing machine, etc., to extend its life, It can produce products in various quantities and in various specifications, and can supply them quickly and on time.

Claims (5)

In the electrochemical continuous processing method of the aluminum sheet used for off-set printing or rotary printing machine, A degreasing step of removing the rolling oil from the surface of the aluminum sheet 11 having a thickness of 0.15 to 0.4 mm in the form of a sheet; Polishing the surface of the aluminum plate 11 by using an electrolysis method, A first washing step of washing the aluminum sheet 11 whose surface is polished with water having a temperature of 50 to 60 ° C, and Dismart process of removing the abrasive residue on the aluminum sheet 11 by using a spray nozzle, A second washing step of washing with water having a temperature of 50 ° C. to 60 ° C., An oxide film forming step of forming an oxide film on the surface of the aluminum sheet 11, A third washing step of washing the aluminum sheet 11 with water having a temperature of 50 to 60 ° C., A hole forming step of forming a minute hole in the surface of the aluminum sheet 11, A fourth washing step of washing with water having a temperature of 50 ° C. to 60 ° C., Drying the aluminum sheet 11, Electrochemical continuous processing method of the aluminum sheet, comprising the step of coating a photosensitive agent on the surface of the aluminum sheet (11). The electrochemical continuous treatment method of an aluminum sheet according to claim 1, wherein the sheet-shaped aluminum sheet (11) is polished to about 0.5 to 2 µm in the electropolishing process. 2. The electrochemical continuous treatment method according to claim 1, wherein an oxide film having a thickness of about 1.5 to 2.5 mu m is formed on the sheet-shaped aluminum sheet (11) in the oxide film forming step. In the electrochemical continuous processing apparatus of the aluminum sheet, Reactor 12 in which the electrolyte is stored, A feed roller 13 installed in the reaction tank 12 to transfer the aluminum sheet 11, An electrode 14 of graphite material which is installed at an appropriate interval on the upper portion of the feed roller 13, Pedestal 15 for supporting the aluminum sheet 11 is installed and transported at an appropriate interval between the transfer roller 13 and, A circulation pump 18 for circulating the electrolyte solution of the reactor 13, A feedback passage 16 for returning the electrolyte circulated by the circulation pump 18 to the reaction tank 12, A power supply unit 10 for supplying AC power to the electrode 14; Electrochemical continuous processing apparatus of the aluminum sheet to polish the surface of the aluminum sheet (11) by the coolers (17) to cool and reuse the electrolyte returned by the circulation pump (18). In the electrochemical continuous processing apparatus of the aluminum sheet, Reactor 21 in which the electrolyte is stored, A feed roller 22 made of stainless steel, which is installed in the reaction tank 21 to convey the aluminum sheet 11, And the stainless steel electrode 23 is provided at a suitable interval on the upper portion of the feed roller 22, A pedestal 24 supporting the aluminum sheet 11 which is installed and conveyed at an appropriate interval between the feed rollers 22, and A circulation pump 27 for circulating the electrolyte in the reaction tank 22, A cooler 26 for cooling the electrolyte circulated by the circulation pump 27, A feedback passage 25 for returning the electrolyte solution cooled by the cooler 26 to the reaction tank 21; A supply passage 28 for spraying the electrolyte solution fed back through the feedback passage 25 on the upper surface of the aluminum sheet 11 being transferred through the discharge hole 29; Electrochemical continuous processing apparatus of the aluminum sheet to form an oxide film by the power supply unit 20 for supplying a DC power to the electrode (23).