JPS6117916B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a plating operation method in a horizontal electroplating device. As a continuous strip plating device, a horizontal electroplating device is known which is equipped with seal rolls on the inlet and outlet sides of a plating tank. Figures 3 and 4 show an example of such a device, in which seal rolls 2 and 2 are installed at the entrance and exit sides of the upper part of the plating tank 1, respectively.
and 3, 3 are provided, and the plating liquid 4 is sealed. The strip 5 enters the plating tank 1 between the entrance seal rolls 2 and 2, passes through the upper and lower electrodes 6 and 6', and exits from between the exit seal rolls 3 and 3. The liquid is being squeezed out. In such a device,
The electrodes 6, 6' are made up of a plurality of square metal rods, but if gaps occur between the square metal rods,
A potential difference occurs between them, and this causes a phenomenon in which plating metal is deposited on the surface of the electrode itself. The metal deposited in this way has poor adhesion to the electrode surface, and is easily peeled off by vibration or jets of plating solution, becoming foreign matter and being included in the plating solution, and some of it is released along with the strip. It gets caught in the seal rolls 3, 3. FIG. 6 shows this kind of jamming situation. When the line speed of the strip is slow, the foreign matter 7 falls onto the upper surface of the strip 5 as shown in FIG. If the line speed is relatively high, the foreign matter 7 floating in the plating liquid 4 will be directly caught by the exit seal roll 3, as shown in Figure b, and if the line speed is even faster. In this case, turbulent flow occurs near the exit seal roll 3, as shown in c in the same figure, and part of the foreign matter 7 is pushed out above the exit seal roll 3, but the other part is pushed out. This will cause the side seal roll 3 to get caught. In this way, in any case, the foreign matter 7 is unavoidably caught in the exit seal roll 3, but if the foreign matter 7 is caught in the strip 5.
If it is bitten by the exit side seal roll 3,
As shown in FIG. 6a, there are problems in that the foreign matter 7' is pressed onto the strip surface and remains there, and the strip 5 is dented by the foreign matter 7, which deteriorates the quality of the product. . The present invention was devised to solve these conventional problems, and it prevents foreign matter in the plating liquid from getting caught in the exit seal roll, thereby preventing the occurrence of scratches on the strip surface due to foreign matter. The purpose of the present invention is to provide an operating method that can perform plating while preventing the occurrence of plating. In the present invention, an injection nozzle is provided on the biting side of the exit seal roll, and the plating liquid is sprayed from one end of the strip in the width direction to the other end on the upper surface side of the strip that exits between the upper and lower electrodes and immediately before the exit seal roll is bitten. By injecting it in the direction, a plating liquid flow with a flow velocity of 0.1 m/s or more at the other end of the strip width direction is formed along the exit side seal roll,
In this way, foreign matter floating on the side where the exit side seal roll is caught or falling onto the upper surface of the strip is blown away from the biting part by the flow from the injection nozzle along the exit side seal roll, and the foreign matter is removed. Caught in the side seal roll is properly prevented. 1 and 2 show an embodiment of the present invention, in which numeral 9 is a storage tank for plating liquid, and the plating liquid is circulated between storage tank 9 and plating tank 1. . The injection nozzle 10 used in the practice of the present invention is disposed at one end of the strip in the width direction in close proximity to the biting part on the upper surface side of the strip of the exit seal rolls 3, 3, and its nozzle opening 11 is arranged horizontally or diagonally. In the downward state, the strip 5 faces the other end in the width direction. The injection nozzle 10
A pipe 12 from the storage tank 9 is connected to the pipe 12, and a pump 13 is provided in the middle of the pipe 12. In the present invention, in such a configuration, the plating liquid in the storage tank 9 is supplied to the injection nozzle 10 by the pump 13 during plating, and immediately before it exits between the upper and lower electrodes 6 and 6' and bites into the exit side seal roll 3. On the upper surface side of the strip, the plating liquid is injected from this injection nozzle 10 toward the other end of the strip 5 in the width direction, thereby forming a flow along the exit seal rolls 3, 3. In this way, foreign matter floating near the exit seal roll 3 or placed on the upper surface of the strip 5 is removed from the strip by the plating liquid flow along the seal roll immediately before it is bitten by the exit seal roll 3. As a result, foreign matter is properly prevented from getting caught in the exit seal roll 3. In order to sweep away foreign matter with a jet stream in this way, the flow velocity at point A in Fig. 2, that is, at the other end of the strip 5 in the width direction, must be at least 0.1 m/s. Therefore, the flow velocity at point A is 0.1 m/s. The plating liquid flow is formed so that the plating liquid flow is equal to or greater than /s. and,
In order to ensure such a flow velocity, the injection nozzle 1
The injection amount, injection pressure, etc. of 0 are determined. Incidentally, in the present invention, the injection angle by the injection nozzle 10, in other words, the downward inclination angle α of the injection nozzle 10 with respect to the strip 5 can be appropriately selected in the range of 0α<90°, but if the efficiency of injection etc. is taken into consideration, it is 0α45 It is preferable to set it to ゜. Further, it is preferable that the injection nozzle 10 be as close to the biting portion of the seal roll 3 as possible. The table below shows the results of implementing the method of the present invention in continuous electrogalvanizing by varying the strip line speed and plating solution flow rate in comparison with the conventional method that does not take any measures against foreign matter. . In addition, in the present invention, the flow velocity by the injection nozzle 10 at the point A is set to 0.8 m/s in both cases.

【table】

[Table] As is clear from the above table, according to the method of the present invention, the occurrence of dents due to foreign matter getting caught can be significantly suppressed compared to the conventional method, and especially when the line speed is high, dents, etc. It can be seen that there are almost no defects. According to the method of the present invention described above, the foreign matter that is about to get caught in the exit seal roll is swept away by the plating liquid flow along the exit seal roll in the plating tank, and the foreign matter is properly caught in the exit seal roll. This has the excellent effect of preventing the occurrence of scratches on the strip and making it possible to obtain a plated product of good quality.

[Brief explanation of the drawing]

Figures 1 to 3 show how the injection nozzle used in carrying out the present invention is attached to the electroplating device, with Figure 1 being an explanatory side view and Figure 2 being a plan view. , FIG. 3 is an explanatory diagram showing the inclination angle of the injection nozzle with respect to the strip. Fourth
5 and 5 show conventional electroplating equipment, FIG. 4 is an explanatory view showing a side view, and FIG. 5 is an explanatory view showing a plan view. FIGS. 6a to 6c are explanatory diagrams showing how foreign matter gets caught in the exit seal roll. In the figure, 7 indicates a foreign object, and 10 indicates an injection nozzle.

Claims (1)

[Claims] 1 A spray nozzle installed on the biting side of the exit seal roll sprays the plating liquid from one end of the strip in the width direction to the other end on the upper surface side of the strip that exits between the upper and lower electrodes and immediately before the exit seal roll bites. 1. A method for operating a horizontal electroplating device, characterized in that a plating liquid flow is formed along an exit seal roll with a flow velocity of 0.1 m/s or more at the other end in the width direction of the strip by injecting the plating liquid in the opposite direction.