JPS60121296A - Metallic strip for roll power supply surface treatment - Google Patents

Abstract

PURPOSE:To provide the titled metallic strip with a small loss of voltage in a roll power supply surface treatment and enabling the supply of a high current at a stable voltage by regulating appropriately the roughness of the surface on the roll power supply side. CONSTITUTION:The generation of a voltage drop in a roll power supply surface treatment can be prevented, and the roll power supply surface treatment can be efficiently carried out with a supply of a high current at a stable voltage by regulating the mean roughness at the center line of the surface on the roll power supply side of a metallic strip for the roll power supply surface treatment to <=about 0.3mum. In addition, the cost of the treatment can be reduced by preventing the generation of arc spots to reduce the damage of the metallic strip or the power supply roll. The mean roughness at the center line of the surface on the roll power supply side is preferably regulated to >=0.05mum from the standpoint of the polishing cost and the life of the strip, and the mean roughness at the center line on the surface opposite to the roll power supply side is desirably regulated to about 0.25-0.45mum to prevent the defects such as decalescence or the roll marks remaining after polishing.

Description

[Detailed Description of the Invention] [Field of Application in the Ordinary Industry] The present invention is directed to continuous anodized aluminum (for example, for building materials, PS boards, etc.)
Roll power supply table 111, such as electric circuit coloring) treatment, electrolytic etching treatment for capacitors, or continuous agate treatment.
Regarding the metal strip for roll feeding surface treatment used in the treatment, in particular, by keeping the center line average roughness of the roll feeding side surface of the metal string to about 0.3 tll+nl or less, voltage loss can be reduced during roll feeding surface treatment. In other words, it is now possible to process by supplying a large current at a low voltage, and the roll feeding surface treatment can be performed effectively, and the metal strip or the feeding roll is not damaged during processing. This invention relates to a metal strip for roll feeding surface treatment which can be carried out at low cost.

[Conventional technology and problems]

Roll feeding surface treatment, for example continuous @electrolytic treatment, is carried out using a continuous electrolytic treatment apparatus as schematically shown in the drawings.

That is, a metal strip (aluminum coil) 1 is wound from a guide roller 2 provided at an appropriate position in front of the entrance side of the electrolytic cell to a power supply roll 3 provided at the upper part of the entrance side of the electrolytic cell. After being guided through immersion rolls in a power station bath, the required electrolytic treatment is applied and the holding roll/1 is covered with an insulating material such as a hard comb to provide electrical power to such metal strips. A feeding roll 3 made of an electrically conductive material such as a metal layer is provided below the lunar pregnancy roll 4. Although not included, a suppressing mechanism is disposed on this presser roll 11, and the presser roll 11 is configured to be press-bonded to the power supply roll: presser roll 4.

5 is a cooling liquid spray nozzle installed in the cut 1.111' 111Q between the power supply roll 3 and the rolling roll 4, and the cooling liquid is sprayed from the spray nozzle 5 onto the power supply roll. , 3 is discharged and supplied to the crimped part, and the cooling liquid is supplied to the rear side between the pressure roll 1 and the 6'roll; A liquid souffle nozzle 6 is provided, and this cooling 7P1 spray nozzle 6 is used to suitably cool the metal strip 1 which is supplied with electricity.

As mentioned in item 1, for example, during electrolytic treatment in a continuous electrolytic treatment device, a large voltage drop may occur in the supply section, which can cause problems such as arc spots. There is a cam when it occurs. In other words, the acid stream may locally concentrate on a portion of low resistance, causing heat generation, arcing, and damage to the metal strip and power supply roll.

In the case of continuous processing of metal strips even if an arc spot does not occur, a large current of several thousand amperes, for example 4 The cooling mechanism also requires a lot of equipment, which increases the size and cost of the equipment.Also, this electric power is wasted and does not contribute to electrolysis at all, and the running processing costs are correspondingly high. Become something.

[Disclosure of the invention]

The average roughness I(a) of the roll-fed metal strip with a thickness of about 02 to Q and 5nlIn is about 0.3.
By configuring it so that it is 0.71 m or less, a voltage drop can be prevented from occurring during surface treatment.

That is, as a result of independent research into the cause of voltage drop, the inventor found that the degree of voltage drop (degree of occurrence of arc spots) changes depending on the degree of surface roughness of the roll feeding side of the metal strip, It was found that when the average roughness a (Ha specified in JIS B12O3) is 0.31μnl or more, the voltage drop F is large and the arc spot occurrence rate becomes significantly large due to rapid freezing. .

In the same way, the smaller the average roughness of the center line, the smaller the voltage drop, which was rarely desirable, that is, the cheap operation with less energy loss, but the cost that is reasonable for reducing Ra is small. The more the polishing is done, the more rapidly the J%l decreases, and the roll life also becomes shorter (in other words, from the standpoint of polishing cost and roll life) (it is desirable that a is 0.005 μm or more).

In addition, a more desirable range is Ha of 010 to 025μ.
■It is from 1.

Also, for example, aluminum strip for printing plates (PS treatment)
The surface is brush-polished (or grained) using 11J treatment, but at this time, the side opposite to the power supply side (product side)
If the center line average roughness 3 is smaller than 0.25 tr 11+, a defect called shine is likely to occur;
It has been found that if the metal strip is larger than 5 μm, the indentation remains after polishing. Roughness Ra f O, 25-0.45 trm, preferably O; 30-0. It was also found that it is important to finish the thickness to /1.0 μm.

Similarly, in order to obtain a metal strip with different surface roughnesses on both sides, rollers with different surface roughnesses may be used.

〔Example〕

For example, in the treatment in a continuous electrolytic treatment apparatus using a power supply device for metal strip as shown in FIG.
Ra) specified in IS BO601 is 0.0:37
1111.0.04ノ+lrl, 0.05μnl, 0.
07μIn, o, osμrLoj1/1m, 0.17μ
nl, 0.1971111.0.25 μm s o, 2
sμm 1 0.30z+In, and the surface roughness on the opposite side is 0.
．． 25 ”n* 0.30 pm s O, 35 tlm
s 0.40 μm 0.45 Il”1 0.3txt of 99% Al purity finished respectively
Prepare an ouuw coil, and place this coil in a sulfuric acid electrolyte.

After this series of alumina treatments, Table 1 shows the roughness and growth rate of the power supply roll and the rate of occurrence of arc spots as shown in Table 1.

[Comparison example] The surface roughness of the power supply roll side mentioned in the above practical example is medium! The average roughness Ha) is, for example, 0.31 μm, 0.3
71+m, 0.44/fill, 99% AI purity, 0.3t x 1 (JOOW aluminum coil sound), 51JOOA power supply in sulfuric acid electrolyte, continuous alumite treatment.

this)! Table 2 shows the relationship between the surface roughness of the power supply roll and the voltage -F and arc spot generation rate during the standard aluminate treatment.

Table 2 [Effects] By configuring the metal strip &llI+ on the power supply roll side so that the center cut/line average roughness is approximately 0.30 μill or less, the voltage drop at the power supply roll portion is small, and therefore This results in low friction and low running processing costs with little energy loss.

Further, since arc spots are less likely to occur, the metal strip is less likely to be damaged, the yield of surface treatment of the metal strip is high, and the treatment cost is accordingly lower.

Furthermore, even if the voltage drop was not large enough to cause an arc spot in the past, the degree of voltage drop was relatively large in the past, and special measures had to be taken to the cooling mechanism, which made the equipment However, the center leg average roughness Ha of the power supply roll side surface of the metal strip is 0.30/Im.
With the following configuration, the voltage drop is now small, the amount of heat generated by this is also small, there is no need to configure a special cooling mechanism in the equipment, and the processing equipment can be small and low cost. It becomes like this.

Furthermore, continuous processing can be performed with stable performance even when a large current is supplied, the metal strip and the power supply roll are not damaged, the processing apparatus itself is highly durable, and moreover, effective continuous processing is possible.

In addition, the average roughness f(
By finishing a to 025 to 045 μm, PS
When used as a plate, there is no drawback called shine, and no rolling marks remain after polishing and PM, making it extremely preferable.

[Brief explanation of the drawing]

The drawing is a schematic explanatory diagram of a continuous electrolytic treatment apparatus. 1. Metal strip. (

Claims (1)

[Claims] ■Roll i (metal for six-sided processing) l) The center line average roughness of the roll power feeding side surface of the tube is approximately 0.31JμIn
A metal strip for roll feeding surface treatment, characterized in that it is configured as follows. (1) Kanahashi steel for roll power feeding surface treatment according to claim 1; l) Tube V in which the centerline average roughness of the roll power feeding side surface is about 00bμIl1 or more. ■Roll power supply side light of roll power supply side of metal strip for surface treatment
Hereinafter, a roll-fed metal strip for cloth processing is characterized in that the center leg average roughness of the surface opposite to the roll power-fed side is about 025 to 045 μIl+.