JPH06280091A - Continuous electrolitic processing device - Google Patents

Abstract

PURPOSE:To uniformly electrolitically process a metallic strip with this simple device instead of an intricate device in the anodization of an aluminum sheet to be used for a lithographic printing plate by suppressing a current flowing on the side ends of the strip. CONSTITUTION:Conveyor rollers 9 are provided close to both ends of an electrolytic electrode 7, and driving rollers 10 are furnished above the conveyor rollers 9. An electrical insulating member 11 is formed into a strip shape with a flexible plastic sheet, both ends of the member are fixed to the driving rollers 10, and the member is wound on the conveyor rollers 9. The inner side end 11a of the member 11 is inclined to the side end 1a of an aluminum strip product 1 from the downstream side toward the upstream side, tapered and continuously placed outside the side end 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously electrolytically treating a strip-shaped metal plate such as anodizing treatment of an aluminum plate used for a lithographic printing plate support.

[0002]

2. Description of the Related Art Generally, an aluminum plate used as a support for a lithographic printing plate is required to have excellent hydrophilicity and water retention property, and therefore, the surface thereof can be mechanically, chemically or electrochemically processed. The surface is roughened by forming fine irregularities. Further, in order to improve the mechanical strength and the water retention of the roughened surface, the surface is generally anodized.

Conventionally, the anodizing treatment of the support for a lithographic printing plate has been carried out by JP-A 48-26638, JP-B 58-24517 and JP-A 47.
The method is carried out by the anodizing method disclosed in each of Japanese Patent Publication No. 18739, etc., and this method is called a so-called submerged power supply method. As an anodizing apparatus using this submersible power feeding method, for example, there is an apparatus shown in FIG. The anodizing apparatus shown in FIG. 6 includes a power supply tank 22 for negatively charging an aluminum product 21, an anodizing tank 23 for anodizing the negatively charged aluminum product 21, a power supply tank 22 and an anode. It is composed of three parts of an intermediate part 24 for preventing a short circuit of an electric current in the liquid intermediate with the oxidation treatment tank 23. Then, in the power feeding tank 22 and the anodizing treatment tank 23, a power feeding electrode 25 and an electrolytic electrode 26 are respectively disposed in an electrolytic solution 27, and these power feeding electrode 25 and electrolytic electrode 26 are connected to a DC power source 28.
Connected through. Further, the electrolytic electrode 26 is formed to be wider than the width of the aluminum product 21 as shown in FIG. 7 in order to correspond to the aluminum products 21 having various widths.

Therefore, in the anodizing tank 23, the electric current is concentrated on the side end portions 21a of the aluminum product 21, and the amount of the oxide film on both side end portions is increased as compared with the central portion. Such a phenomenon does not become a problem when the amount of supplied current is small, but when increasing the processing line speed to improve productivity or increasing the anodized film amount to improve quality performance, , Aluminum products 21
The amount of oxide film on the side end 21a of the
The so-called burn failure occurred due to exceeding the allowable limit for quality or local concentration of reaction. Therefore, it was not possible to increase the current density, and it was not possible to increase the speed of the processing line or increase the amount of anodized film. In addition, since the current density cannot be increased, the equipment is large and the equipment cost is high.

Therefore, conventionally, an anodizing apparatus as disclosed in JP-A-54-81134 has been proposed. This anodizing apparatus, as shown in FIG. 8, includes an electrolytic electrode 32 and an aluminum product in an anodizing tank 31.
The electric insulating member 34 is arranged between the side end portion 33a of 33 and the side end portion 33a to suppress the current flowing to the side end. The electrical insulating member 34 is fixed to the tip of the adjusting bar 35, and the adjusting bar 35 is led out to the outside through the side wall 36 of the anodizing treatment tank 34.

[0006]

However, in the above-described conventional electrolytic treatment apparatus, since the adjusting bar 35 supporting the electric insulating member 34 penetrates the side wall 36 of the anodizing treatment tank 31, the electrolytic solution 37 Special sealing means must be provided to prevent leakage, which complicates the device. Also, in order not to provide the sealing means,
Since the width of the anodizing bath 31 must be widened,
The area unrelated to the transportation of the aluminum product 33 was widened, the apparatus was enlarged, and the amount of the electrolytic solution 37 used was increased.

Further, when the traveling speed of the aluminum product 33 is high, the length of the anodizing treatment tank 31 becomes 10 m or more, so that the electric insulating member 34 naturally becomes 10 m or more, and the adjusting bar 35 which supports the electric insulating member 34. The number of dozens becomes. Therefore, the number of cylinders and hydraulic means for driving the adjusting bar 35 increases, and the device becomes complicated.

Further, the inner side end 34a (the side end closer to the strip-shaped metal plate) 34a of the electric insulating member 34 is always fixed at the same position in the traveling direction of the aluminum product 33. If the position of the side edge 34a is slightly displaced,
This had a great influence on the distribution of the amount of anodized film in the width direction. Therefore, the inner side edge of the electrical insulation member 34
It was necessary to align 34a with extremely high accuracy.
Further, when the aluminum product 34 meanders during running, an abnormality is likely to occur in the widthwise distribution of the amount of anodized film.

An object of the present invention is to solve the above problems and to provide a continuous electrolytic treatment apparatus which is simple and small in size, and which can perform uniform electrolytic treatment.

[0010]

The present invention has been made to achieve the above object, and a continuous electrolytic treatment apparatus according to the present invention has an electrolytic solution and an electrolytic electrode provided in the electrolytic solution. Then, in the device for electrolytically treating the strip-shaped metal plate by running the strip-shaped metal plate in the electrolytic solution, the strip-shaped metal plate is arranged between the electrolytic electrode and the strip-shaped metal plate so as to substantially face each other at both ends thereof, It can move back and forth in the running direction of the strip metal plate, and
A flexible strip-shaped electrical insulating member whose side end on the side of the strip-shaped metal plate is formed so as to change the distance from the side end of the strip-shaped metal plate, and a method for running the strip-shaped metal plate or a method for removing the strip-shaped metal plate from the electrical insulating member. It has a drive means for moving in the traveling direction.

The electrically insulating member according to the present invention is formed such that the side end on the side of the strip-shaped metal plate changes its distance from the side end of the strip-shaped metal plate. By forming like this,
When the width of the strip-shaped metal plate changes, by moving the electrical insulating member in the running direction of the strip-shaped metal plate, the position of the side end of the electrical insulating member can be changed to the optimum position, and the width can be varied. It can be set at the optimum position on the strip metal plate.
For example, the side end of the electrical insulating member on the side of the strip-shaped metal plate is formed in a tapered shape at an angle, and the outer side end is formed parallel to the side end of the strip-shaped metal plate. That is, the widths of the electrically insulating members are formed so that one end has a maximum width and the other end has a minimum width.

The side end of the electrically insulating member on the side of the strip-shaped metal plate has a linear shape, a saw blade shape, a triangular or quadrangular continuous concave and convex shape,
It can be formed into a concavo-convex shape having continuous arcs, a sine curve shape, or the like. When it is formed in a concavo-convex shape such as a saw blade shape, the influence thereof when the belt-shaped metal plate meanders is smaller than that when formed in a linear shape.

The position of the side end of the electrically insulating member with respect to the strip-shaped metal plate is appropriately set depending on the width of the strip-shaped metal plate, the amount of supply current, and the like. Set the position so that it covers.

As the electric insulating member, polyester sheet, vinyl chloride sheet, polypropylene sheet, polyvinyl alcohol sheet, plastic sheet such as Teflon sheet, chloroprene rubber, nitrile rubber, ethylene.
A rubber sheet such as propylene rubber, urethane rubber, styrene rubber or butadiene rubber can be used.

The drive means moves the electrically insulating member in the traveling direction or the anti-traveling direction of the strip-shaped metal plate so as to be in the optimum position with respect to the strip-shaped metal plate. Then, when the strip-shaped metal plate meanders during the electrolytic treatment, the meandering is detected and the driving means is operated to correct the electrical insulating member to the optimum position, or when the strip-shaped metal plates having different widths are subjected to the electrolytic treatment,
The drive means is operated to move the electrically insulating member to the optimum position for the strip-shaped metal plate to be processed next.

As the driving means, for example, two driving rollers are provided, and the end portions of the electric insulating member are fixed to the two driving rollers, or the electric insulating member formed in an endless annular shape is wound around the driving roller. .

The strip-shaped metal plate is made of pure aluminum or an aluminum alloy, and examples of the aluminum alloy include aluminum with metals such as silicon, iron, copper, manganese, magnesium, chromium, zinc, bismuth and nickel. There is an alloy. The thickness of the strip-shaped metal plate is generally in the range of 0.1 to 0.5 mm.

The electrolytic solution may be, for example, an aqueous solution of sulfuric acid, phosphoric acid, oxalic acid or a salt thereof, or a mixed solution thereof, and an optimum one may be selected to obtain a desired quality. The concentration and temperature of the electrolytic solution can be freely selected.

As the power source waveform, a direct current is generally used, but in addition to this, an AC waveform, an AC / DC superposed waveform or the like which is optimum for obtaining a desired quality can be selected.

The current density can be freely selected. For example,
The value may be kept constant during the processing time, or the current density may be gradually increased.

[0021]

In the continuous electrolytic treatment apparatus of the present invention, the driving means moves the electrically insulating member in the traveling direction or the anti-traveling direction of the strip-shaped metal plate. The moved electrical insulating member is formed such that the side edge on the side of the strip-shaped metal plate changes its distance from the side edge of the strip-shaped metal plate. The distance between and changes, and the optimal position is set. Therefore, the electrically insulating member set at the optimum position suppresses the current supplied to the side end portion of the strip-shaped metal plate, and prevents the side end portion from being electrolytically processed more than necessary.

Further, even if the strip-shaped metal plate meanders during the electrolytic treatment, the side end of the electrically insulating member on the strip-shaped metal plate side is formed so that the distance from the side end of the strip-shaped metal plate changes. The influence of the change in the interval due to the meandering is small, and the influence on the electrolytic treatment is small.

An embodiment of the continuous electrolytic treatment apparatus of the present invention will be described with reference to the drawings. 1 is an overall schematic view of a continuous electrolytic treatment apparatus, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is an enlarged plan view of an electric insulating member of the continuous electrolytic treatment apparatus.

In these drawings, reference numeral 1 is an aluminum strip-shaped product as a strip-shaped metal plate, reference numeral 2 is a power supply tank for negatively charging the aluminum strip-shaped product 1, and reference numeral 3 is anodizing treatment of the aluminum strip-shaped product 1. Is an anodizing treatment tank for. Between the power supply tank 2 and the anodizing treatment tank 3, there is an intermediate portion 4 for preventing a short circuit of current in the middle of the liquid.
Is provided. The power supply tank 2 is filled with the electrolytic solution 5 and the power supply electrode 6 is provided, and the anodizing tank 3 is also filled with the electrolytic solution 5 and the electrolytic electrode 7 is provided. And the electrolytic electrode 7 are connected via a DC power supply 8.

A pair of transport rollers 9, 9 for transporting the electrically insulating member are provided near both ends of the electrolytic electrode 7, respectively. Above the transport rollers 9, 9 and outside the anodizing tank 2. Drive rollers 10, 10 are provided as drive means for moving the electrically insulating member in the traveling direction of the aluminum strip 1.

Reference numeral 11 is an electric insulating member, and the electric insulating member 11 is formed of a flexible plastic sheet in a band shape, and both ends of the electric insulating member 11 are fixed to the driving rollers 10 and 10 and wound around the conveying rollers 9 and 9. It is attached. Further, the inner side end 11a of the electric insulating member 11 is a drive roller on the downstream side.
From the end fixed to 10 to the end fixed to the upstream drive roller 10, the side end 1 of the aluminum strip 1
The outer side end 11b is formed in parallel with the side end 1a of the aluminum strip-shaped product 1 in such a manner that it is inclined with respect to a and is continuously outward. That is, the electrically insulating material 11 is formed so that the width thereof gradually decreases from the downstream end portion to the upstream end portion.

The tapered inner side end 11a of the electrical insulating member 11 is operated by actuating the drive roller 10 so that the center line a of the electrolytic electrode 7 in the longitudinal direction (the running direction of the aluminum strip 1) and the aluminum. It is set so as to pass through the intersection b with the side end 1a of the strip-shaped product 1.

In the continuous electrolytic treatment apparatus as described above, the aluminum strip-shaped product 1 is made to travel and anodization is performed while supplying a current from the DC power source 8 as in the conventional case. And
If the traveling path of the aluminum strip 1 is inside or outside, the intersection b changes in the width direction, so that the drive roller 10 moves the electric insulating member 11 to readjust it.

When anodizing the different aluminum strip-shaped products 1, the position of the side end 11a of the electric insulating member 11 is adjusted by the drive roller 10 according to the width of the aluminum strip-shaped product 1.

FIG. 4 is an enlarged plan view of another embodiment of the electrically insulating member. The inner side end 11a of the electric insulating member 11 shown in this figure is formed in a continuous triangular shape, and is formed so as to have a narrow width from one end to the other end.

FIG. 5 is also an enlarged plan view of another embodiment of the electrically insulating member. The inner side end 11a of the electric insulating member 11 shown in this figure is formed in a continuous corrugated shape, and is formed so as to have a narrow width from one end to the other end.

[0032]

EXAMPLES Next, specific examples of electrolytic treatment performed by the continuous electrolytic treatment apparatus will be described.

Example 1 A JIS 1050 aluminum strip-shaped product (thickness 0.15 mm, width 1000 mm) was anodized using the continuous electrolytic treatment apparatus shown in FIGS.

As the electrically insulating member, a vinyl chloride sheet having a thickness of 0.5 mm was used. Then, the electric insulating member was set so that the side end of the electric insulating portion passes through the intersection of the longitudinal center line of the electrolytic electrode and the side end of the strip-shaped product. At both ends of the electrolytic electrode, the upstream side of the electrically insulating member was located 50 mm outside the strip-shaped product, and the downstream side was located 50 mm inside the strip-shaped product.

The anodizing conditions are as follows. Electrolyte: 30 ℃, 150g / l sulfuric acid aqueous solution Line transfer speed: 50m / M Current density: 20A / dm ² Electrode width: 1500mm Electrode / aluminum spacing: 50mm

[Conventional Example 1] The same strip plate product as in Example 1 was used in Example 1 by using the continuous electrolytic treatment apparatus shown in FIGS.
Anodizing treatment was performed under the same anodizing treatment conditions as above.

[0037]

The concentration of the film on the side edge and the amount of backing were carried out by the melt weight method, and the presence or absence of burn failure was judged by visual observation.

Further, in Example 1, even if the strip-shaped product meandered, it had almost no effect on the anodized film.

[0040]

According to the present invention, it is possible to suppress the electric current to the side end portions of the strip-shaped metal plate with a very simple device without complicating the device, and to perform uniform electrolytic treatment.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of an electrolytic treatment apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an enlarged plan view of an electrically insulating member used in the electrolytic treatment apparatus according to the present invention.

FIG. 4 is an enlarged plan view of another example of the electrical insulating member used in the electrolytic treatment apparatus according to the present invention.

FIG. 5 is an enlarged plan view of another example of the electrical insulating member used in the electrolytic treatment apparatus according to the present invention.

FIG. 6 is a schematic sectional view of a conventional electrolytic treatment apparatus.

FIG. 7 is an enlarged cross-sectional view of a conventional electrolytic treatment apparatus.

FIG. 8 is a sectional view of a conventional electrolytic treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Belt-shaped metal plate 1a ... Side end 2 ... Power supply tank 3 ... Anodizing tank 4 ... Intermediate part 5 ... Electrolyte solution 6 ... Power supply electrode 7 ... Electrolytic electrode 8 ... Power supply 9 ... Conveying roller 10 ... Driving roller 11 ... Electrical insulating member 11a ... Side edge of the strip-shaped metal plate

Claims (1)

[Claims] 1. An apparatus comprising an electrolytic solution and an electrolytic electrode provided in the electrolytic solution, wherein a strip-shaped metal plate is run in the electrolytic solution to electrolytically process the strip-shaped metal plate, the electrolytic electrode and the strip-shaped metal plate. Between the strip-shaped metal plate and the strip-shaped metal plate, the strip-shaped metal plate and the strip-shaped metal plate are arranged opposite to each other, and are movable in the traveling direction of the strip-shaped metal plate. A flexible belt-shaped electric insulating member formed so that the distance is changed, and a driving means for moving the electric insulating member in a traveling method of the belt-shaped metal plate or in a reverse traveling direction. Continuous electrolysis treatment equipment