JP3167061B2 - Electrolytic treatment method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic treatment method and apparatus for electrochemically roughening the surface of an aluminum web used for a PS plate support or the like.

[0002]

2. Description of the Related Art In general, an aluminum web is used as a PS plate support, and its surface is made to have good adhesion to a photosensitive layer provided thereon, and is made of wet water used for printing. It is usually roughened for holding and the like.

Conventionally, as a method for this surface roughening, there has been a method disclosed in Japanese Patent Application Laid-Open No. 2-298300. In this method, when a three-phase current or an alternating current is applied to the electrode to electrochemically roughen the electrode, the frequency of the three-phase current or the alternating current is increased in a range higher than a power frequency of 50 Hz. The value of the frequency is adjusted to be higher as the transport speed increases.

[0004]

However, in the method disclosed in Japanese Patent Laid-Open No. 2-298300, the power frequency must be adjusted in order to keep the cross stroke within a predetermined range. The electrolysis conditions (power supply frequency) were changed by the change of, and it was not possible to form a rough surface having a constant performance. That is, since the cross stroke is determined by the line speed and the power frequency, when the line speed is changed, the power frequency must be changed to obtain the same cross stroke. Therefore, the power supply frequency is different at different line speeds, and as a result, the degree of surface roughening is different.

In the above-mentioned conventional method, the contrast of the cross stroke is large and conspicuous.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can always obtain a constant surface roughening condition, and can carry out an electrolytic processing method in which a cross stroke is not conspicuous and this electrolytic processing method can be suitably implemented. It is an object of the present invention to provide an electrolytic treatment apparatus that can perform the treatment.

The inventor of the present invention has made intensive studies to achieve the above object, and has found that the cross stroke is determined by the line speed and the distance between the tips of the two series of power supply electrodes having polarities different from the power supply frequency. Heading, the present invention has been completed.

That is, according to the electrolytic treatment method of the present invention, in the electrolytic solution containing metal ions, the polarity is different from that of the material to be treated.
In an electrolytic processing method of supplying an alternating current between the power supply electrodes of the series and electrochemically forming a rough surface on the material to be processed, the processing line speed is set to y [m / min] and the electrolytic power supply frequency is set to f.
[Hz], when the interval between the tips of the two series of power supply electrodes having different polarities is x [cm], x, y, and f are selected so as to satisfy the following conditions, and the electrolytic surface roughening treatment is performed. It is characterized by performing.

[0009]

(Equation 3) Or

[0010]

(Equation 4) Where g (a) = a- [a], where [a] is the largest integer not exceeding a.

[0011]

(Equation 5) Within this range, the contrast of the cross stroke is large, and the appearance becomes very noticeable.

When the power supply electrodes are arranged in a plane, the distance x between the tips of the two series of power supply electrodes having different polarities is a linear distance parallel to the plane. When they are arranged in a shape, they are intervals on a curve parallel to the curved surface.

By the way, in order to carry out the above-mentioned electrolytic treatment method, it is necessary to keep the treatment line speed and the electrolytic power supply frequency constant.
The frequency of the electrolytic power supply may deviate from the initial set value, and may not satisfy the above relational expression. As a result, the level of the visibility of the cross stroke varies, and the cross stroke may or may not be visible depending on the sample.

The inventor of the present invention has intensively studied an electrolytic processing apparatus in which the frequency of the electrolytic power source is always constant, and has found an apparatus which is extremely suitable for performing the above-described electrolytic processing method.

That is, the electrolytic processing apparatus of the present invention performs an electrochemical surface roughening treatment by supplying an alternating waveform between a material to be processed and a power supply electrode in an electrolytic solution containing metal ions. Wherein a crystal oscillation circuit is used as an oscillation circuit for controlling the frequency of the electrolytic power supply.

Examples of the electrolyte containing metal ions include hydrochloric acid,
There is nitric acid.

The material to be treated is appropriately determined according to the purpose. For example, in the case of a support for a PS plate, an aluminum web is used.

[0018]

In the electrolytic treatment method of the present invention, suitable conditions are set by appropriately changing the interval between the tips of the power supply electrodes and / or the line speed and / or the power supply frequency, so that the cross stroke is hardly seen. .

Further, in the electrolytic processing apparatus of the present invention, the crystal oscillation circuit maintains the electrolytic power supply frequency at the initial set value, and the power supply frequency does not drift even if the continuous operation is performed for a long time. It has a constant rough surface that does not fluctuate the level of visibility.

A specific example of the method for electrolytically treating a lithographic printing plate support of the present invention will be described with reference to FIG.

FIG. 1 is a schematic sectional view of an electrolytic processing apparatus for realizing a method for electrolytically processing a lithographic printing plate support. In this figure, reference numeral 1 denotes an electrolytic treatment tank in which rectangular power supply electrodes 2 and 3 are provided. An electrolytic solution supply pipe 4 is connected to one end of the bottom surface of the electrolytic treatment tank 1, and an electrolytic solution discharge pipe 5 is connected to the other end. The tube 5 is connected to a stock tank 6 for storing an electrolyte. Also,
The electrolyte supply pipe 4 is provided with a pump 7.
The electrolytic solution 8 from the stock tank 6 to the electrolytic treatment tank 1
To supply.

The power supply electrodes 2 and 3 are electrically connected to a power supply 9, and pass rolls 10 are arranged inside and outside the electrolytic treatment tank 1 to form a transfer path for an aluminum web 11 as a material to be treated. ing.

A method of electrolytically treating an aluminum web with the above electrolytic treatment apparatus will be described.

First, when one end of the electrode opposite to the aluminum transport direction is set as the tip of the electrode, the supply electrode 2
X, the line speed y for conveying the aluminum web 11 and the frequency f of the power supply 9

[0025]

(Equation 6) Or

[0026]

(Equation 7) Is set to satisfy. Then, the aluminum web 11 is brought into close contact with the pass rolls 10.
To rotate the aluminum web 11 and
The power supply 9 is turned on to supply a current to the power supply electrodes 2 and 3, and the exposed surface of the aluminum web 11 is subjected to electrolytic treatment via the electrolytic solution 8.

FIG. 2 is also a schematic side view of an electrolytic treatment apparatus for realizing the electrolytic treatment method for a lithographic printing plate support of the present invention.

In FIG. 2, reference numeral 21 denotes an electrolytic treatment tank having an inner surface having an arc shape larger than a semicircle, and arc-shaped power supply electrodes 22 and 23 are provided on the inner surface of the electrolytic treatment bath 21. The electrodes 22 and 23 are connected to a power supply 24. An electrolytic solution supply port 25 is provided at the center of the bottom of the electrolytic treatment tank 21, and electrolytic solution outlets 26 and 26 are provided on both upper sides. The electrolytic solution supply port 25 and the electrolytic solution outlet 26 are provided in a stock tank. It is connected to 27. A pump 28 is provided between the electrolyte supply port 25 and the stock tank 27 so that the electrolyte 29 in the stock tank 27 can be supplied to the electrolytic treatment tank 21.

The power supply electrode 2 is provided inside the electrolytic treatment tank 21.
A drum roll 30 having a concentric circumference at a slight distance of 2 and 23 is provided rotatably in a state of being almost immersed in the electrolyte solution 29, and pass rolls 31 and 31 are provided above the drum roll 30. An aluminum web 32 as an object to be processed is provided by the drum roll 30 and the pass roll 31.
Are configured.

A method of electrolytically treating an aluminum web with the above electrolytic treatment apparatus will be described.

As in the case of FIG. 1 described above, the power supply electrode 22
The distance x between the end portions of the power supply electrode 23, the line speed y for transporting the aluminum web 32, and the frequency f of the power supply 24 are set to predetermined values. Then, the aluminum web 32 is brought into close contact with the drum roll 30 and the pass roll 31, the drum roll 32 is rotated to convey the aluminum web 32, and the power supply 24 is turned on to supply a current to the power supply electrodes 22 and 23, and the electrolytic solution The exposed surface of the aluminum web 32 is electrolytically treated via 29.

FIG. 3 is a schematic view of one embodiment of the electrolytic processing apparatus of the present invention. The electrolytic processing apparatus shown in FIG.
Is connected to a crystal oscillator 41 as a crystal oscillation circuit for controlling the frequency of the power supply 9 to be constant. Other configurations are the same as those of the electrolytic processing apparatus shown in FIG. In this electrolytic processing apparatus, the crystal oscillator 41 always controls the frequency of the power supply 9 to a set value.

[0033]

【Example】

[Example 1] Electrolytic treatment of an aluminum web of JIS1050 as a material to be treated was performed by an electrolytic treatment apparatus shown in FIG. As the electrolytic solution, aluminum nitric acid having a nitric acid concentration of 20 g / l, an aluminum ion concentration of 10 g / l, and a temperature of 55 ° C. was used.

The distance x between the supply electrode tips is x = 19.
0cm, line speed y = 130m / min, power frequency f
Was set to f = 40 Hz. At this time, the value of g (a) is g (a)
= G (60 × 190 × 40/100 × 130) = 0.07, which is smaller than 0.2, and satisfies the conditions of [Equation 1] and [Equation 2].

When the surface of the aluminum web subjected to the electrolytic treatment under the above electrolytic conditions was visually observed, the cross stroke was hardly noticeable.

[Comparative Example 1] The distance x between the supply electrode tips is x
= 220 cm, and the electrolytic treatment was performed using the same apparatus and conditions as in Example 1 except for that. At this time, the value of g (a) is g
(A) = g (60 x 220 x 40/100 x 130) = 0.61 and 0.2
It is larger and smaller than 0.8, and does not satisfy the conditions of [Equation 1] and [Equation 2].

When the surface of the aluminum web subjected to the electrolytic treatment under the above electrolytic conditions was visually observed, a cross stroke having a pitch of 54.2 mm was clearly seen.

[Example 2] JIS 1050 as a material to be treated
The electrolytic treatment of the aluminum web was performed by the electrolytic treatment apparatus shown in FIG. An electrolytic solution having a nitric acid concentration of 20 g / l, an aluminum ion concentration in the electrolytic solution of 10 g / l, and a temperature of 55 ° C. was prepared and sent to an electrolytic treatment tank via a pump. At this time,
The line speed was 130 m / min, the power frequency was 40.00 Hz, and the distance between the electrode tips was 190 cm. At this time, the value of g is determined to be g = 0.077, which satisfies the condition of 0.0 ≦ 0.07 ≦ 0.2.

Thereafter, the power supply was kept in the operating state, and after 5 hours, the frequency of the power supply was measured. As a result, the power frequency is 40.001
Hz. At this time, when the value of g is obtained, g = 0.078
Which satisfies the condition of 0.0 ≦ g ≦ 0.2. When the aluminum web was observed after the electrolytic treatment, almost no cross stroke was observed when the power supply frequency was 40.00 Hz or 40.001 Hz.

Comparative Example 2 An electrolytic treatment was performed under the same electrolytic conditions as in Example 2 except that an electrolytic treatment apparatus using an RC oscillation circuit 42 in the oscillation circuit as shown in FIG. 4 was used.

When the electrolytic treatment was started, the frequency of the electrolytic power supply was 40.00 Hz. Thereafter, the power supply was kept in the operating state, and after 5 hours, the frequency of the power supply was measured. As a result, the power supply frequency was 40.23 Hz. At this time, the value of g is determined to be g = 0.279, which does not satisfy the condition of 0.0 ≦ g ≦ 0.2. Observation of the aluminum web after the electrolysis treatment showed that the frequency 4 when the electrolysis was started
Cross-stroke was hardly observed in the 0.00 Hz electrolyzed aluminum web, but very poor cross-stroke was observed in the aluminum web electrolyzed at a frequency of 40.23 Hz after 5 hours from the start of electrolysis. Was done.

[0042]

According to the present invention, the cross stroke can hardly be recognized, and when the power supply frequency is determined, the distance between the electrodes is optimized.
Further, when the distance between the electrodes is determined, various line speeds can be coped with by optimizing the frequency within a range that does not affect the electrolytic treatment, so that a uniform rough surface can always be formed.

Also, by using a crystal oscillation circuit,
The above-described electrolytic treatment method can be reliably performed, and the level of visibility of AC electrolytic unevenness is constant regardless of time, and a uniform product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an electrolytic treatment tank according to one embodiment of the electrolytic surface roughening treatment method of the present invention.

FIG. 2 is a schematic side view of an electrolytic treatment tank according to an embodiment of the electrolytic surface roughening treatment method of the present invention.

FIG. 3 is a schematic view of an embodiment of the electrolytic processing apparatus according to the present invention.

FIG. 4 is a schematic diagram of an electrolytic processing apparatus used in a comparative example.

[Explanation of symbols]

 1, 21 ... electrolytic treatment tank 2, 3, 22, 23 ... power supply electrode 8, 29 ... electrolytic solution 9, 24 ... power supply 11, 32 ... aluminum web (workpiece) 41 ... crystal oscillation circuit

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C25F 3/04 B41N 3/03

Claims (2)

(57) [Claims] 1. The method according to claim 1, wherein the material to be treated is in an electrolytic solution containing metal ions.
In an electrolytic treatment method for supplying an alternating current between two series of power supply electrodes having different polarities to electrochemically form a rough surface on a material to be treated, a treatment line speed is set to y [m / min],
Electrolytic power supply frequency f [Hz], two series with different polarities
Wherein the distance between the leading end portions of the power supply electrodes is x [cm], x, y, and f are selected so as to satisfy the following conditions, and the electrolytic surface roughening treatment is performed. Equation 1 Or {Where, g (a) = a- [a], where [a] is the largest integer not exceeding a} 2. An electrolytic processing apparatus for performing an electrochemical surface roughening treatment by supplying an alternating waveform between a material to be treated and a power supply electrode in an electrolytic solution containing metal ions, wherein the frequency of an electrolytic power supply is controlled. Characterized in that a quartz oscillation circuit is used for the oscillation circuit to be turned on