JPS6112997B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for partially plating a part of one side of a long object to be plated in the form of stripes or continuous spots. Conventionally, when a long object to be plated is continuously partially plated in this way, there are two methods: (1) pasting masking tape on areas that do not need to be plated, or (2) mechanically holding down areas that do not need to be plated in a plating tank. The method of plating is done by covering up or hiding the plating liquid so that it does not get into unnecessary areas. However, with method (1), masking tape is required to cover the entire area where plating is not required, so if only a portion of one side is to be plated, masking tape is required for the back side, and the area to be plated is Since the long body is fully immersed in the plating tank, a large amount of liquid is carried out due to its movement, which is often disadvantageous when plating precious metals. Also,
Since the stirring effect on the plating solution cannot be expected to be large, the working current density cannot be increased, resulting in poor efficiency. Method (2) does not require a masking material, but has the disadvantage that the boundary between the plated portion and the non-plated portion is not clearly visible, and the plating device is complicated and thus requires an expensive device. In addition to (1) and (2), general partial plating methods that do not primarily target long objects include screen printing, liquid level control, localized liquid contact, and photoresist printing. Methods other than the method have drawbacks in plating accuracy and application of long objects, and photoresist printing methods have the drawback of being too high-grade and expensive. The present invention has been made in view of the above points, and improves the plating method by using an injection nozzle in which a large number of nozzle holes are linearly provided in the peripheral wall of a cylindrical body along the axial direction of the cylindrical body. Accordingly, the object of the present invention is to provide a plating method capable of applying economical and qualitatively superior partial plating in the form of stripes or spots on one side of a long object to be plated using masking tape. That is, the gist of the present invention is to provide a method for partially plating a long body to be plated, which has a portion to be plated in a striped or continuous spot shape along the longitudinal direction on one side thereof, by guiding it to a plating tank. In the plating tank, an injection nozzle having a plurality of nozzle holes linearly provided in the peripheral wall of the cylindrical body along the axial direction is used to direct the nozzle holes toward the part of the elongated body to be plated. The long body is placed parallel to the long body, masking tape is applied to the unnecessary parts of the long body to be plated, and the long body to be plated is led to a spot-shaped tank and the plating liquid is sprayed from the spray nozzle to perform the plating. be. Next, the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows, as a reference example, a case in which the entire one side of the long body 1 to be plated is partially plated, and FIG. 2 shows a case in which a part of one side of the long body 1 to be plated is partially plated as a second embodiment. It is something. As shown in FIG. 3, jet nozzles 3 are provided by providing a large number of nozzle holes 7, 7, 7, . In Figure 3,
Numerals 8 and 11 are plating liquid introduction pipes connected to both sides of the jet nozzle 3, respectively, and arrows 12 indicate the inflow direction of the plating liquid. Now, in the case of Fig. 1, a plate 5 is placed at the bottom of the plating tank 2 filled with the plating liquid 4 so that the nozzle hole 7 faces upward.
A jet nozzle 3 is attached through the plate, and the long body 1 to be plated is brought into contact with and travels on the surface of the plating liquid 4 to perform plating. Plating is performed on the entire one side of the elongated body 1 to be plated. Since the plating liquid 4 is jetted from the jet nozzle 3 toward the long body 1 to be plated,
The plating liquid 4 in the plating tank 2 is constantly stirred. Further, outside the plating tank 2, there is a receiving tank 10 having a drain pipe 9, and by configuring the entire plating tank 2 in this way, the plating liquid 4 overflowing from the plating tank 2 is circulated through the nozzle 3 and reused. It can be returned to plating tank 2. In the case of FIG. 2, since only a part of one side of the elongated body 1 to be plated is to be plated, masking tape 6 is applied to unnecessary areas. However, the first
The same applies to the case shown in the figure, but masking tape is not required for the back side. In this manner, plating is performed in the same manner as in the case of FIG. Next, reference examples and examples of the present invention will be described. [Reference Example] One side of a copper strip was partially plated by the method shown in FIG. 1 under the following conditions. The process is as shown in FIG.

〔Example〕

After degreasing and washing with water under the same conditions as in the reference example, drying was added, and one side of the copper strip was striped with silver by the method shown in FIG. The plating width is 5 mm at the center of the copper strip. The obtained product has a nickel plating thickness of 2μ and a silver plating thickness of 3μ, and is 0.5t x 35 x 170m, approx.
This product weighing 30Kg was completed in 3.5hr. As described above, in the present invention, when partial plating in the form of stripes or continuous spots is applied to one side of a long object to be plated, the circumferential wall of the cylindrical object is applied along the axial direction in opposition to the partial plating position. By using an injection nozzle with a large number of nozzle holes arranged in a straight line, the plating liquid is sufficiently agitated by the injection nozzle. Even if the spot area is very small, ion supply and diffusion to the cathode surface is promoted, increasing the plating current density and speeding up the work speed, as well as eliminating variations in the plating thickness in the longitudinal direction and uniform plating gloss. Uniform plating can be obtained. In the present invention, in which partial plating is performed using masking tape, stirring of the plating solution is important because when the stripe width or spot area becomes small, the part to be plated becomes a valley due to the thickness of the masking tape. The invention allows reliable stirring due to the presence of the injection nozzle. Note that a conventional plating method that does not use a long body to be plated can only obtain half the current density. Further, in the present invention, by running the elongated body to be plated in contact with the plating liquid with one side facing the jet direction of the plating liquid, it is possible to save masking material, and also to make the long body to be plated Since the number of parts of the body that come into contact with the plating solution can be reduced, there is an effect that the removal of the plating solution out of the tank can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a reference example for explaining the present invention, FIG. 2 is an explanatory diagram of an embodiment of the partial plating method of the present invention, FIG. 3 is a perspective view of an injection nozzle according to the present invention, and FIG. is the Metsuki process diagram. 1... long body to be plated, 2... plating tank, 3...
...Spray nozzle, 4...Plating liquid, 5...Plate, 6...
...Masking tape, 7...Nozzle hole, 8,1
1... Metsuki liquid introduction pipe, 9... Drain pipe, 10...
...Receiving tank, 13...Electrolytic degreasing, 14...Water washing, 15
... Pickling, 16 ... Nickel plating, 17 ... Silver plating, 18 ... Drying, 19 ... Sending out, 20 ...
... Winding, 21... Masking tape pasting machine.

Claims (1)

[Claims] 1. In a method of partially plating a long body to be plated, which has a part to be plated in a striped or continuous spot pattern along the longitudinal direction on one side thereof, into a plating tank for partial plating, in the plating tank,
A jet nozzle, which has a plurality of nozzle holes linearly provided in the peripheral wall of a cylindrical body along its axial direction, is directed parallel to the long body to be plated so that the nozzle holes are directed toward the part of the long body to be plated that is to be plated. On the other hand, apply masking tape to the parts of the long body to be plated that do not need to be plated.
A partial plating method characterized in that a long body to be plated is guided into a plating tank, and plating is performed by spraying a plating liquid from an injection nozzle.