JP2003003299A - Electrolytic treatment equipment and electrolysis method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electrolytic treatment equipment and electrolytic treatment method capable of effectively preventing the formation of charter marks even when the electrolytic treatment of a metallic sheet is performed at a high conveyance speed and high current density. SOLUTION: The electrolytic treatment equipment which continuously electrolytically treats the belt-like metallic sheet by an AC waveform current while conveying the metallic sheet in an acidic electrolyte has an electrolytic cell in which the acidic electrolyte is housed and the metallic sheet is conveyed. The inlet section of the electrolytic cell is formed with a soft start section for electrolytically treating the metallic sheet at the low current density in such a manner that MCD×LS/L=1 to 750 (L: the length (mm) of the soft start section, LS: the conveyance speed (mm/scd) of the metallic sheet, MCD: the maximum current density (A/dm<2> ) holds.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic treatment apparatus and an electrolytic treatment method, and particularly to a surface of a continuous strip-shaped metal plate even when the metal plate is electrolytically treated at a high current density and a high transport speed. The present invention relates to an electrolytic treatment apparatus and an electrolytic treatment method capable of effectively preventing the formation of chatter marks.

[0002]

2. Description of the Related Art A lithographic printing original plate, which is an original plate of a lithographic printing plate, generally has a surface of a plate of pure aluminum or an aluminum alloy (hereinafter sometimes referred to as "aluminum or the like") roughened, and then, By subjecting the surface to anodizing treatment, an anodized film is formed to obtain a lithographic printing plate support, and a photosensitive resin or a heat-sensitive resin is formed on the surface of the lithographic printing plate support on which the anodized film is formed. It is prepared according to the procedure of applying to form a photosensitive or heat-sensitive plate-making layer.

A lithographic printing plate is produced by printing a printed image such as characters and pictures on the plate making layer of the lithographic printing original plate and developing it.

The aluminum plate is mechanically roughened by a brush roller having nylon bristles or a polishing roller having a surface made of a polishing cloth, and the surface of the aluminum plate is chemically roughened in an alkaline solution. The surface is roughened by an etching treatment to be performed, an electrolytic surface roughening treatment to electrolytically roughen the aluminum plate as one of the electrodes.

[0005]

However, in the electrolytic surface roughening treatment, an alternating waveform current such as a sine wave current, a rectangular wave current or a trapezoidal wave current is usually applied to the aluminum plate in an acidic electrolyte. The positive voltage and the negative voltage are alternately applied to the aluminum plate at the inlet of the electrolytic cell.

In the aluminum plate, a cathode reaction occurs when a positive voltage is applied, and an anode reaction occurs when a negative voltage is applied. And during the cathode reaction,
An oxide film mainly composed of aluminum hydroxide is formed, and during the anodic reaction, the oxide film is dissolved to form a honeycomb-shaped small hole called a pit.

Therefore, the aluminum plate passing through the inside of the electrolytic cell first undergoes a cathodic reaction when a positive voltage is applied at the inlet of the electrolytic cell and an anodic reaction when a negative voltage is applied. The surface state of the aluminum plate varies depending on the polarity of the current applied at the inlet of the electrolytic cell, and striped uneven surface quality, that is, chatter marks extending in the width direction of the aluminum plate may occur. In particular, when the electrolytic surface roughening treatment is performed at a high transport speed and a high current density, the chatter mark may be remarkably generated.

The present invention has been made to solve the above problems, and can effectively prevent the occurrence of chatter marks even when electrolytic treatment such as electrolytic surface roughening treatment is performed at a high transport speed and a high current density. An object is to provide an electrolytic treatment apparatus and an electrolytic treatment method.

[0009]

The invention according to claim 1 is an electrolytic treatment apparatus for continuously electrolytically treating a strip-shaped metal plate by an alternating waveform current while transporting it in an acidic electrolyte. The acidic electrolytic solution is accommodated, and the inside is provided with an electrolysis tank in which the metal plate is conveyed, and the metal plate is introduced into the inlet portion of the electrolysis tank where the metal plate is introduced. A soft start portion for electrolytically processing at a current density lower than the current density of the alternating waveform current applied inside the inlet portion is provided, and the soft start portion along the conveyance surface that is the conveyance path of the metal plate. Is L (mm), and the transport speed of the metal plate is LS (mm
/ Sec), the maximum current density in the electrolytic cell is MCD (A
/ Dm ² ), the soft start portion is formed so that the following relational expression: MCD × LS / L = 1 to 750 holds.

In the electrolytic treatment apparatus, chatter marks are not generated and a uniform treated surface is obtained even when electrolytic treatment of a metal plate is performed at high current density and transport speed.

Therefore, if the electrolytic treatment apparatus is used for electrolytic surface roughening of an aluminum plate described in the section "Prior Art", the aluminum plate can be electrolytically surface roughened at a high current density and a transport speed. A lithographic printing plate support can be manufactured with high productivity.

The soft start portion may be formed so that the length L satisfies the relationship of MCD × LS / L = 50 to 300 between the transport speed LS of the metal plate and the maximum current density MCD. preferable.

The metal plate is not limited to the aluminum plate as long as it can be roughened by applying an alternating waveform current.

The acidic electrolyte may be a solution containing a strong inorganic or organic acid such as sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid or sulfonic acid as a main acid component. The acidic electrolytic solution may contain ions of a metal element that forms the metal plate, in addition to the acidic screen.

The soft start portion has a current density of 10 A applied to the metal plate at the entrance of the metal plate.
/ Dm ² or less, and particularly preferably the current density is 1 to 5 A / dm ² .

As described above, examples of the alternating waveform current include a sine wave current, a rectangular wave current and a trapezoidal wave current. In addition, a DC current may be superimposed and applied to the sine wave current, the rectangular wave current, or the trapezoidal wave current.

According to a second aspect of the present invention, the electrolytic treatment apparatus has the soft start portion formed so that the current density continuously increases to the maximum current density along the transport direction of the metal plate. Regarding

In the electrolytic treatment apparatus, since the current density does not change stepwise between the soft start portion inside the electrolytic cell and the portion inside thereof, the chatter mark is generated more effectively. It can be effectively prevented.

According to a third aspect of the present invention, the electrolytic cell is
The electrode is arranged along the transport surface, and comprises an electrode to which the alternating waveform current is applied.
The present invention relates to an electrolytic processing apparatus, wherein the soft start portion has an asymptotic portion that is continuously close to the transport surface toward the downstream side with respect to the transport direction of the metal plate.

In the electrolytic treatment apparatus, if the distance between the electrode and the carrying surface of the metal plate is large, the layer of the acidic electrolytic solution existing between the electrode and the carrying surface becomes thick, and therefore, the electrode and the metal plate. High electrical resistance between the board. On the other hand, when the distance is small, the thickness of the layer of the acidic electrolyte is small, so that the electric resistance between the electrode and the metal plate is low.

Here, in the electrolytic treatment apparatus, as described above, in the soft start portion, the electrode is continuously connected to the transport surface of the metal plate toward the downstream side with respect to the transport surface. Since an asymptotic portion that is close to, in other words, asymptotic to, is formed, the electrical resistance between the electrode and the metal plate decreases toward the downstream side with respect to the transport direction of the metal plate. Therefore, the current flowing between the electrode and the metal plate increases toward the downstream side with respect to the transport direction, so that the asymptotic portion functions as a soft start portion.

As described above, the electrolytic treatment apparatus has a characteristic that the structure is simple because the soft start portion can be formed without adding any apparatus or parts to the conventional electrolytic cell.

The electrolytic treatment apparatus has a shallow rectangular parallelepiped electrolytic cell and a plate-shaped electrode provided on the bottom surface of the electrolytic cell, and conveys a metal plate in parallel to the electrode inside the electrolytic cell. When it is a flat type electrolytic treatment device that
In the soft start portion, the asymptotic portion of the electrode may be formed so as to linearly asymptote to the transport surface of the metal plate, but the asymptotic portion is a cylindrical surface convex toward the transport surface. If it is formed, the change in the current density between the soft start portion and the portion on the downstream side with respect to the transport direction becomes smoother, which is preferable.

In the electrolytic treatment apparatus, a feed roller for winding and transporting the metal plate, an electrode formed in a substantially cylindrical shape so as to surround the feed roller, and an electrolytic cell for accommodating the feed roller and the electrode. In the case of the radial type electrolytic treatment apparatus having the above, it is preferable that the asymptotic portion is formed in a planar shape extending in the tangential direction from the cylindrical inner peripheral surface of the electrode.

The electrodes may be integrally formed, or may have a structure in which a plurality of small electrodes and plate-like or layer-like insulators are alternately laminated.

According to a fourth aspect of the present invention, the electrode has a plurality of small electrodes insulated from each other at least in the soft start portion, and supplies the alternating waveform current to each of the small electrodes. And an electric current limiting means for reducing the density of the electric current supplied from the electric power source to be smaller than the maximum current density.

The current throttling means is formed so that the electric current is supplied at a higher current density toward the small electrode located on the downstream side in the transport direction of the metal plate.

Examples of the current throttle means include an inductance coil and a resistor which will be described later. Others include transformers, voltage control circuits, and current control circuits that are inserted between each of the electrodes and a power source.

The fifth aspect of the present invention relates to the electrolytic treatment apparatus, wherein the current limiting means is an inductance coil.

The electrolytic processing apparatus is an example of the electrolytic processing apparatus according to claim 4, wherein an inductance coil is used as the current limiting means.

The inductance coil is also called an inductor, and a coil having an iron core or a coil having no iron core can be used.

Since the inductance coil increases the inductance between the electrode and the power supply to regulate the current flowing through the electrode, there is almost no resistance loss. Further, since the inductance coil does not require any control device, the electrolytic treatment device has a feature that the structure is simple.

The invention according to claim 6 relates to the electrolytic treatment apparatus wherein the current limiting means is a resistor.

The electrolytic processing apparatus is an example of the electrolytic processing apparatus according to claim 4, wherein a resistor is used as the current limiting means.

In the electrolytic treatment apparatus, since the resistor is used as the current throttling means, there is only a resistive load between the power source and the small electrode. Therefore, the power factor is 1.

According to a seventh aspect of the present invention, the soft start portion is located at an asymptotic portion formed near the entrance of the metal plate in the electrode and at a downstream side of the asymptotic portion.
The present invention relates to an electrolytic treatment apparatus comprising a small electrode insulated from each other and a current throttle unit having a current throttle means connected to each of the small electrodes.

In the electrolytic treatment apparatus, since the asymptotic portion and the current throttling means are used together in the soft start portion, the soft start portion is softened depending on the maximum current density in the electrolytic treatment apparatus and the transport speed of the metal plate. It has a feature that the change pattern of the current density in the start portion can be widely changed.

The invention according to claim 8 relates to the electrolytic treatment apparatus, wherein the metal plate is an aluminum plate.

The electrolytic treatment apparatus can be used, for example, to electrolytically roughen a continuous strip of aluminum plate to produce a support for a lithographic printing plate.

According to a ninth aspect of the present invention, there is provided an electrolytic treatment method in which a strip-shaped metal plate is continuously electrolytically treated in an acidic electrolytic solution with an alternating waveform current. In the electrolysis tank in which the metal plate is transported, a soft start for electrolyzing the metal plate at an entrance portion of the metal plate at a current density lower than a current density inside the entrance portion of the electrolysis tank. Is provided, the length of the soft start portion along the transport surface that is the transport path of the metal plate is L (mm), the transport speed of the metal plate is LS (mm / sec), the electrolytic bath If the maximum current density in the interior is MCD (A / dm ² ), electrolytic treatment is performed using an electrolytic cell in which the soft start portion is formed so that the following relational expression: MCD × LS / L = 1 to 750 holds. To do The present invention relates to a characteristic electrolytic treatment method.

Even when the metal plate is electrolyzed at a high current density and a high transport speed, a metal plate having no chatter mark and a uniform treated surface can be manufactured by using the above-mentioned electrolytic treatment method.

The invention according to claim 10 relates to an electrolytic treatment method, wherein the metal plate is an aluminum plate.

According to the above-mentioned electrolytic treatment method, the aluminum plate can be electrolytically surface-roughened at a current density and a transporting speed higher than those in the prior art, so that the lithographic printing plate support can be produced with high productivity.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Embodiment 1 An example in which the present invention is applied to a radial type of an electrolytic surface roughening treatment apparatus for electrolytically roughening treatment by alternating current electrolysis of an aluminum web which is a continuous strip-shaped aluminum plate will be described below. To do.

As shown in FIG. 1, the electrolytic surface-roughening treatment apparatus 100 according to the first embodiment includes an electrolytic cell body 2 having an electrolytic cell 2A in which an acidic electrolytic solution is stored, and an electrolytic cell 2A.
An aluminum web W that is a strip-shaped continuous thin plate disposed rotatably around an axis extending in the horizontal direction inside.
Is provided in the direction of arrow a, that is, from the right side to the left side in FIG.

The inner wall surface of the electrolytic cell 2A is formed in a substantially cylindrical shape so as to surround the feed roller 4, and semicylindrical electrodes 6A and 6B are provided on the inner wall surface so as to sandwich the feed roller 4 therebetween. There is. The electrodes 6A and 6B are divided into a plurality of small electrodes 62A and 62B along the circumferential direction,
An insulating layer 6 is formed between the electrodes 62A and 62B.
4A and 64B are interposed. The small electrodes 62A and 62B can be formed by using, for example, graphite or metal, and the insulating layers 64A and 64B can be formed by, for example, vinyl chloride resin. Insulation layers 64A and 6
The thickness of 4B is preferably 1 to 10 mm. Although not shown in FIG. 1, in each of the electrodes 6A and 6B, the small electrodes 62A and 62B are connected to the power supply AC.
It is connected to the. The small electrodes 62A and 62B and the insulating layers 64A and 64B are all electrode holders 64 having an insulating property.
It is held by C to form electrodes 6A and 6B.

The power supply AC has a function of supplying the alternating waveform current to the electrodes 6A and 6B. The power supply AC
Is a sine wave generation circuit that generates a sine wave by adjusting the current and voltage of a commercial alternating current using an induction voltage regulator and a transformer, a trapezoidal current from a direct current obtained by means such as rectifying the commercial alternating current. Alternatively, a thyristor circuit that generates a rectangular wave current may be used.

An aluminum web W, which is an example of the metal plate of the present invention and is a continuous strip-shaped aluminum plate, is introduced into the upper portion of the electrolytic cell 2A during the AC electrolytic graining treatment.
An opening 2B that is led out is formed. An acidic electrolyte replenishment flow path 8 for replenishing the electrolytic bath 2A with an acidic electrolyte is provided near the downstream end of the electrode 6B in the opening 2B. A nitric acid solution, a hydrochloric acid solution or the like can be used as the acidic electrolyte.

In the vicinity of the opening 2B above the electrolytic cell 2A, a group of upstream guide rollers 10A for guiding the aluminum web W into the electrolytic cell 2A and an aluminum plate W electrolyzed in the electrolytic cell 2A are electrolyzed. A downstream guide roller 10B that guides the outside of the tank 2A is provided.

An overflow tank 2C is provided on the upstream side of the electrolytic cell 2A in the electrolytic cell body 2. The overflow tank 2C temporarily stores the acidic electrolytic solution overflowing from the electrolytic tank 2A,
It has the function of keeping the liquid level of A constant.

An auxiliary electrolytic cell 12 is provided between the electrolytic cell 2A and the overflow layer 2C. The auxiliary electrolytic cell 12 is shallower than the electrolytic cell 2A and has a bottom surface 12A formed in a flat shape. The cylindrical auxiliary electrode 14 is formed on the bottom surface 12A.
Is provided in plural.

The auxiliary electrode 14 is preferably formed of a highly corrosion-resistant metal such as platinum or ferrite, and may be plate-shaped.

The auxiliary electrode 14 is connected in parallel to the electrode 6A on the side to which the electrode 6A in the AC power supply AC is connected, and in the middle, the thyristor Th1 is connected to the electrode 6A in the AC power supply AC at the time of ignition. It is connected so that a current flows from the side connected to the auxiliary electrode 14 to the auxiliary electrode 14.

Further, on the side of the AC power source AC to which the electrode 6B is connected, the auxiliary electrode 1 is also provided through the thyristor Th2.
4 is connected. The thyristor Th2 is connected so that a current flows in a direction from the side connected to the electrode 6B in the AC power supply AC to the auxiliary electrode 14 at the time of ignition.

When either of the thyristors Th1 and Th2 is fired, the anode current flows through the auxiliary electrode 14. Therefore, by controlling the phases of the thyristors Th1 and Th2, the current value of the anode current flowing through the auxiliary electrode 14 can be controlled. Therefore, the amount of electricity Gc flowing when the aluminum web W is the cathode and the amount of electricity Qa flowing when the aluminum web W is the anode are obtained. The ratio Qc / Qa of can also be controlled.

Electrode 6 in the electrolytic graining apparatus 100
Soft start parts 60A and 6 in A and 6B
Details of the portion near 0B are shown in FIG. In FIG. 3, the electrode 6A, the electrode 6B, the electrolytic cell 2
Both A and the aluminum web W are shown in a linearly developed state. The feed roller 4 is omitted in FIG.

As shown in FIGS. 1 and 3 (A), the ends of the electrodes 6A and 6B on the upstream side of the transport direction a of the aluminum web W are respectively fed along the transport direction a. Asymptotic portions 66A and 66B that are asymptotic to the surface of the roller 4 are formed, whereby soft start portions 60A and 60B are formed inside the electrolytic cell 2A. In FIG. 3, a dotted arrow indicates that a current is flowing toward the aluminum web W, and the higher the density of the arrow, the higher the current density.

The asymptotic parts 66A and 66B are the same as those in the first embodiment.
In the electrolytic graining apparatus 100, the surface is formed flat, but may be formed in a convex or concave curved surface shape with respect to the surface of the feed roller 4, in other words, the transport surface T of the aluminum web W.

The soft start units 60A and 60B are
When the electrolytic surface-roughening treatment is performed in the electrolytic surface-roughening treatment apparatus 100, from the position where the color of the surface of the aluminum web W begins to change inside the electrolytic cell 2A, the asymptotic portion 66A.
And 66B is the downstream end, that is, the section to the end point. As shown in FIG. 3A, the start points of the soft start sections 60A and 60B are located at the upstream ends of the asymptotic sections 66A and 66B, that is, upstream of the start points of the asymptotic sections 66A and 66B. The soft start portions 60A and 60B have a length L along the transport direction a.
However, MCD × LS / L = 1 to 750 (LS (mm / sec) is the transport speed of the aluminum web W, and MCD (A / dm ² ) is the maximum current density in the electrolytic surface roughening treatment apparatus 100. There is).

If the lengths L of the soft start portions 60A and 60B satisfy the above relational expression, chatter marks are not generated on the surface of the aluminum web W, and the honeycomb bits, that is, honeycomb shapes are formed. The dense small holes are uniformly formed on the entire roughened surface of the aluminum web W. Further, it is preferable that the length L of the soft start portions 60A and 60B satisfy the following relational expression MCD × LS / L = 50 to 200 because a more uniform honeycomb bit is formed on the aluminum web W.

The operation of the electrolytic graining apparatus 100 shown in FIG. 1 will be described below.

The aluminum plate W guided to the electrolytic cell body 2 from the right side in FIG. 1 is first introduced into the auxiliary electrolytic cell 12 and then guided to the electrolytic cell 2A by the upstream guide roller 10A. Then, by the feed roller 4,
Is sent from the right side to the left side in FIG. 1 and guided to the outside of the electrolytic cell 2A by the downstream guide roller 10B.

The aluminum web W introduced into the electrolytic cell 2A first passes through the soft start portion 60A.
At the start point of the soft start portion 60A, the distance between the aluminum web W and the electrode 6A is
Since it is wider than the interval on the downstream side of 0A,
For the reason described in the description of claim 3 in [Means for Solving the Problems], as indicated by a dotted arrow in FIG.
It is much smaller than the maximum current density MCD in the electrolytic cell 2A.

As the soft start portion 60A moves toward the downstream side, the current density flowing through the aluminum web W increases, and becomes equal to the maximum current density MCD at the end point of the soft start portion 60A.

After passing through the soft start portion 60A, the aluminum web W is conveyed along the electrode 6A,
Due to the alternating waveform current applied from the power supply AC to the electrode 6A, the surface facing the electrode 6A undergoes an anode or cathode reaction.

The aluminum web W which has passed near the electrode 6A then passes through the soft start portion 60B. In the soft start portion 60B as well, as in the soft start portion 60A, the current density flowing in the aluminum web W increases as the aluminum web W moves toward the downstream side, and at the end point of the soft start portion 60B, the maximum current is increased. It is equal to the density MCD.

After passing through the soft start portion 60B, the aluminum web W is likewise conveyed along the electrode 6B, and the surface facing the electrode 6A by the alternating waveform current applied to the electrode 6B from the power source AC. React with the anode or cathode to form a honeycomb bit on the entire surface.

In the electrolytic surface-roughening apparatus 100 according to the first embodiment, since the electrolytic cell 2A is provided with the soft start portions 60A and 60B, the aluminum web W introduced into the electrolytic cell 2A is initially low. A current of current density is applied. Therefore, in the case of roughening at a high current density, chatter marks are not generated even if the transport speed of the aluminum web W is increased, and a uniform honeycomb bit is formed on the entire roughened surface of the aluminum web W. Is formed.

Electrolytic surface roughening apparatus 100 according to the first embodiment
Since there are almost no parts newly added to the conventional electrolytic surface roughening device, it also has a feature that the conventional electrolytic surface roughening device can be modified at low cost.

2. Embodiment 2 Another example in which the present invention is applied to a radial type electrolytic surface roughening device will be described below.

Electrolytic surface roughening treatment apparatus 10 according to the second embodiment
An outline of the configuration of No. 2 is shown in FIG. 2, the same reference numerals as those in FIG. 1 denote the same elements as those shown in FIG. 1 unless otherwise specified.

Details of the configuration near the soft start portions 60A and 60B in the electrodes 6A and 6B are shown in FIG. 3 (B).

As shown in FIGS. 2 and 3B, among the small electrodes 62A forming the electrode 6A, each of the three small electrodes 62A located at the upstream end and the power supply AC.
An inductance coil 68A is provided between and. Similarly, of the small electrodes 62B forming the electrode 6B,
An inductance coil 68B is provided between each of the three small electrodes 62B located at the upstream end and the power supply AC.

Inductance coils 68A and 68B
Is an ordinary coil and has an action of blocking an alternating current since it has an inductance. Therefore, the currents flowing through the small electrodes 62A and 62B in the soft start portions 60A and 60B are smaller than the currents flowing through the small electrodes 62A and 62B in the electrodes 6A and 6B on the downstream side of the soft start portions 60A and 60B, that is, the maximum current density MCD. Is also small.

Inductance coils 68A and 68B
Has a smaller inductance as it is located on the downstream side, that is, on the right side in FIG. 3, and specifically, for example, the number of turns of the coil is smaller. Therefore, the small electrode 62A forming the soft start portions 60A and 60B is formed.
Further, among the small electrodes 62B, the one located on the most upstream side, that is, on the inlet side of the aluminum web W has the smallest current density, and the one located on the downstream side has a larger current density.

Therefore, also in the electrolytic surface-roughening treatment apparatus 102 according to the second embodiment, in the soft start portions 60A and 60B, the current density increases toward the maximum current density MCD along the transport direction a of the aluminum summation portion W. Increase.

A resistor may be used instead of the inductance coils 68A and 68B.

The electrolytic surface-roughening treatment apparatus 102 is the electrolytic surface-roughening treatment apparatus 100 according to the first embodiment except for the above points.
It has the same configuration as.

The electrolytic surface-roughening treatment apparatus 102 has the characteristic that the inductance of the inductance coils 68A and 68B can be adjusted even during operation, in addition to the characteristic of the electrolytic surface-roughening treatment apparatus 100.

Therefore, while performing the electrolytic surface roughening treatment of the aluminum web W, the inductances of the inductance coils 68A and 68B are adjusted according to the maximum current density MCD and the transport speed of the aluminum web W to roughen the aluminum web W. It is possible to prevent the formation of chatter marks or non-uniform portions on the surface to be surfaced.

As described above, the electrolytic graining treatment device 102
Can correspond to the maximum current density MCD and the transport speed of the aluminum web W in a wider range than the electrolytic surface roughening treatment apparatus 100 according to the first embodiment.

3. Embodiment 3 FIG. 4 shows a schematic configuration of still another example in which the present invention is applied to a radial type electrolytic surface roughening treatment apparatus. 4, the same reference numerals as those in FIGS. 1 to 3 denote the same elements as those shown in the drawings.

As shown in FIG. 4, in the electrolytic graining apparatus 104 according to the third embodiment, the soft start unit 6
0A and the asymptotic parts 66A and 66B are formed on the most upstream side in the soft start part 60B.
And reactance coils 68A and 68B are connected to the small electrodes 62A and 62B located downstream of 66B and 66B, respectively. The reactance coils 68A and 68B are the electrolytic graining treatment apparatus 1 according to the third embodiment.
Similar to No. 02, it is formed so that the inductance on the downstream side becomes smaller.

The electrolytic surface-roughening treatment apparatus 104 is the same as the electrolytic surface-roughening treatment apparatus 100 according to the first embodiment except for the above points.
It has the same configuration as.

In addition to the features of the electrolytic surface-roughening treatment apparatus 100, the electrolytic surface-roughening treatment apparatus 104 can change the current density in the soft start portion 60A and the soft start portion 60B more gradually and continuously. Has features.

The example in which the present invention is applied to the radial type electrolytic surface roughening treatment apparatus has been described above.
It goes without saying that the present invention can also be applied to a flat type electrified surface roughening treatment device.

[0087]

EXAMPLES The present invention will be described in more detail below with reference to examples. (Examples 1 to 5, Comparative Examples 1 to 3) Using the electrolytic surface roughening device 100 shown in FIG. 1, a width of 1000 mm and a thickness of 0.24 mm
Was subjected to electrolytic surface roughening treatment. The length L of the soft start portions 60A and 60B, the transport speed LS of the aluminum web W, and the maximum current density MCD are
Changes were made as shown in Table 1.

Regarding the quality of the aluminum web W electrolytically surface-roughened by the electrolytic surface-roughening treatment apparatus 100, the presence or absence of chatter marks and the uniformity of the grain shape were visually observed, and ◯: excellent, ○ Δ: Good, Δ: acceptable, ×: evaluated in four grades. The results are shown in Table 1. In addition, regarding the uniformity of the grain shape, "x" indicates that it was easily recognized visually that the formed grain was not uniform.

[0089]

[Table 1]

As shown in Table 1, the ratio MCD × LS / L
Examples 1 to 5 using an electrolytic surface roughening treatment apparatus in which a soft start portion having a length such that is in the range of 1 to 750 is formed.
In the above, even when electrolytic surface roughening was performed at a high current density and a transport speed, chatter marks were not recognized in the aluminum web W after electrolytic surface roughening, and the grain shape was uniform, In Comparative Examples 1 to 3 in which the ratio MCD × LS / L was outside the above range, clear chatter marks were recognized on the aluminum web W after electrolytic surface roughening, and the grain shape was not uniform.

[0091]

As described above, according to the present invention,
Provided are an electrolytic treatment apparatus and an electrolytic treatment method capable of effectively preventing the formation of chatter marks even when electrolytic treatment is performed at a high transport speed and a high current density.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of an example of applying the present invention to a radial type electrolytic graining apparatus.

FIG. 2 is a cross-sectional view schematically showing the configuration of another example in which the present invention is applied to a radial type electrolytic graining treatment apparatus.

FIG. 3 is a development view showing details of a soft start portion in the electrolytic surface-roughening treatment apparatus shown in FIGS. 1 and 2.

FIG. 4 is a cross-sectional view showing a schematic configuration of still another example in which the present invention is applied to a radial type electrolytic graining treatment apparatus.

[Explanation of symbols]

2 Electrolyzer body 2A electrolysis tank 4 feed rollers 6A electrode 6B electrode 12 Auxiliary electrolyzer 14 Auxiliary electrode 60A Soft start part 60B Soft start part 62A small electrode 62B small electrode 64A insulation tank 64B insulation tank 66A Asymptotic part 66B Asymptotic part

Continued front page    (72) Inventor Tsuyoshi Hirokawa             Fuji-Sha, 4000 Kawajiri, Yoshida-cho, Haibara-gun, Shizuoka Prefecture             Shin Film Co., Ltd. F term (reference) 2H114 AA04 AA14 DA04 EA01 EA02                       GA08

Claims (10)

[Claims] 1. An electrolytic treatment apparatus for continuously electrolytically treating a strip-shaped metal plate with an alternating waveform current while transporting the metal plate in the acidic electrolyte, wherein the acidic electrolyte is accommodated inside the metal plate. Is provided with an electrolyzer, the inlet part of the electrolyzer into which the metal plate is introduced, the metal plate, the alternating waveform current applied inside the electrolyzer than the inlet part. A soft start part for electrolyzing at a current density lower than the current density is provided, and the length of the soft start part along the carrying surface, which is a carrying path of the metal plate, is L (mm). Assuming that the transport speed is LS (mm / sec) and the maximum current density in the electrolytic cell is MCD (A / dm ² ), the following relational expression: MCD × LS / L = 1 to 750 Formed Electrolytic treatment apparatus characterized by comprising been. 2. The electrolytic treatment apparatus according to claim 1, wherein the soft start portion is formed such that the current density continuously increases up to the maximum current density along a transport direction of the metal plate. . 3. The electrolytic cell is arranged along the transport surface, and comprises an electrode to which the alternating waveform current is applied, wherein the electrode is the metal plate in the soft start portion. The electrolytic treatment apparatus according to claim 2, further comprising: an asymptotic portion that is continuously close to the transport surface toward the downstream side with respect to the transport direction. 4. The electrode has a plurality of small electrodes insulated from each other at least in the soft start portion, and between each of the small electrodes and a power supply for supplying the alternating waveform current, The electrolytic treatment apparatus according to claim 2, further comprising: a current throttling unit that reduces the density of the current supplied from the power source to be smaller than the maximum current density. 5. The electrolytic processing apparatus according to claim 4, wherein the current limiting unit is an inductance coil. 6. The electrolytic processing apparatus according to claim 4, wherein the current limiting unit is a resistor. 7. The soft start portion is formed in the vicinity of the entrance of the metal plate in the electrode, and an asymptotic portion located downstream of the asymptotic portion and insulated from each other and the small electrode. 5. A current throttling section having a current throttling means connected to each of the above.
6. The electrolytic treatment apparatus according to any one of 6 above. 8. The electrolytic treatment apparatus according to claim 1, wherein the metal plate is an aluminum plate. 9. An electrolytic treatment method for continuously electrolytically treating a strip-shaped metal plate in an acidic electrolytic solution by an alternating waveform current, wherein the acidic electrolytic solution is accommodated and the metal plate is conveyed inside. In the electrolysis tank according to the above, at the inlet of the metal plate, the metal plate is provided with a soft start portion for electrolytically treating at a current density lower than the current density inside the entrance of the electrolysis tank, The length of the soft start portion along the transportation surface, which is the transportation path of the metal plate, is L
(Mm), the transport speed of the metal plate is LS (mm / sec),
The maximum current density inside the electrolytic cell is MCD (A / d
m ² ), electrolytic treatment is carried out using an electrolytic cell in which the soft start portion is formed so that the following relational expression: MCD × LS / L = 1 to 750 holds. . 10. The electrolytic treatment method according to claim 9, wherein the metal plate is an aluminum plate.