JPS6217195A - Method for partially plating beltlike long-sized body - Google Patents

Abstract

PURPOSE:To carry out partial plating on a beltlike long-sized body with clear boundaries at a low cost by sticking masking tapes having the irreducible minimum width to the outsides of the part of the body to be plated and by placing mechanical masks on the outsides of the tapes so that the masks overlap the tapes. CONSTITUTION:When a beltlike long-sized body 1 is partially plated, masking tapes 2 having the irreducible minimum width are accurately stuck to the outsides of the part of the body 1 to be plated. Mechanical masks 3 of silicone rubber are then pressed on the outsides of the tapes 2 so that the masks 3 overlap the tapes 2. In this state, the long-sized body 1 is plated. Thus, clear plating boundaries are given by partial plating and the amount of the masking tapes 2 used is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for partially plating a long belt-like body, and more particularly to a method for masking a long belt-like body to be plated. It is.

The method of the present invention is applied, for example, to the production of electronic component materials or contact materials by partially plating copper strips, copper alloy strips, iron strips, or iron alloy strips.

[Prior Art] Conventionally, various methods have been known for partially plating a long strip-shaped body, but methods for masking the material to be plated, especially when making a strip-shaped plated strip, can be roughly divided into: There are masking methods using masking tape and mechanical masking methods. The former tape masking method involves attaching a flame-retardant masking tape to the material to be plated at room temperature or after heating, cutting out the part to be plated on the tape to create an opening, and passing the plating process through the opening. was being administered. In the mechanical masking method, the boundary of the opening of a mold in which the part to be plated is to be plated is directly pressed or clamped onto the material to be plated using a mechanical device or jig, and the plating process is performed in this state. The specific method is the belt method,
Caterpillar systems and drum systems are known.

[Problems to be Solved by the Invention] However, the above-mentioned conventional technology has the following problems. In other words, in the tape masking method, if masking tape is applied to all parts of the material to be plated that are not to be plated (non-plated parts), the amount of tape consumed will increase, the cost will increase, and problems such as tape breakage and tape adhesion will occur. Problems occur regularly, such as the adhesive of the tape remaining on the boundaries of plated parts, and in order to continuously supply the tape, it is necessary to join the tapes at predetermined intervals. Additionally, there were many problems in that the tape could be cut or the mask could be torn due to the edges of the material. In addition, in the mechanical masking method, since the mechanical mask jig is grounded for each plating bath, there is always some misalignment at the mask boundary, and therefore, for example, in the case of laminated plating, a step may occur at the boundary. Furthermore, since the masking boundary is created by mechanically pressing the mask mold, the boundary becomes unclear and appears out of focus.On the other hand, if a highly accurate masking device is used, the entire device will be quite expensive due to the masking part. Masking jigs such as belts have to be replaced every time the type of material to be plated is changed, which poses a problem in that the work is troublesome.

[Means and effects for solving the problems] The present invention solves the problems in the prior art described above, and provides a clear plating boundary when partially plating a strip-shaped elongated body. The purpose of the present invention is to provide a new plating method that can reduce the amount of masking tape used. That is, in the present invention, a masking tape of the required minimum width is attached to the outer periphery of a portion of a belt-like elongated body to be partially plated, a second mask is placed on the outside of the masking tape, and then the plating is performed. This is a partial plating method for a belt-like elongated body, which is characterized by subjecting it to a treatment.

The present invention will be explained in detail below.

The elongated strips applied to the plating method of the present invention are, for example, strips of conductive metal such as copper or copper alloy, 4270I, and these strips have a particular thickness.

Although there is no limit to the width, the present invention can be carried out more effectively if the elongated body is thick enough to be wound into a roll.

The surface of this elongated body is plated partially, and in a desirable embodiment, in the form of stripes.

According to the present invention, in order to partially plate the strip-shaped elongated body, masking tape is first applied to the outside of the part to be plated. Conventional commercially available masking tapes can be used, and their usual structure is that the base material is a plastic film that has masking properties that do not allow paint or plating liquid to pass through, and an adhesive is applied to the lower side of the film. The object to be coated is cut into tape shapes. In terms of performance, there are types that are sticky at room temperature and types that become sticky when heated, and they are appropriately selected and applied depending on the surface of the material to be plated. As described in the prior art section, masking tape should originally be attached to the entire non-plated part of the plated surface of this elongated body, but the present invention applies this masking tape and the second mask. However, the amount of expensive masking tape applied is reduced as much as possible, and the masking tape with the narrowest possible width is applied inside the outline of the non-plated portion of the plated surface of the elongated body. The width of this tape as narrow as possible depends on the accuracy of the overlapping of the next mechanical mask, but if the outline of a mechanical mask, for example a rubber mask, is on this masking tape,
This is the minimum width that allows the plating solution to be excluded. If the width of the masking tape is too narrow and the mechanical mask fails, there is a risk that the plating solution will reach non-plated parts of the elongated body and plate them. Since a masking tape of a predetermined width and as narrow as possible is applied in this way, it is easiest, most reliable, and preferable to mask in the form of a narrow strip and plate it. In this case, the masking tape can also be applied mechanically. Of course, the masking tape may be applied manually. In the case of manual work, the shape of the plated portion is not particularly limited to a narrow band shape, and can be made into various shapes. FIG. 1(a) shows the elongated body 1 to be plated in this way.
FIG. 2 is a cross-sectional view of a state in which a narrow masking tape 2 is attached to. As shown, the masking tape 2 has a fairly narrow width and is precisely adhered along the inner contour of the non-plated portion. FIG. 1(b) is a sectional view of the state shown in FIG. 1(a) in which a mechanical mask 3 made of silicone rubber is further pressed. As shown in the figure, only a fairly small amount of masking tape is attached to the long body that is the material to be plated, and a fairly large area (depending on the shape of the plated part) is covered by the mechanical mask. It can be seen that the amount of masking tape used is significantly reduced.

The mechanical mask itself in the present invention is a conventionally known technology and can be utilized for the present invention, but the mechanical mask itself is not shown in FIGS. Several examples of mask transformations are illustrated. (a) The figure shows a masking tape 2 applied to a strip 1 which is a material to be plated using the present invention.
After being pasted, a belt-type mechanical mask 3-a is pressed, and (b) shows an air jet-type mechanical mask (air flow) 3-b applied. (C
) The figure shows an embodiment in which a thick, inexpensive adhesive tape that can be used repeatedly is adhered as a mechanical mask 3-c. In all types M, the boundaries of the plated portions are precisely formed with masking tape, and the outside of this masking tape (non-plated portions) is further covered roughly but reliably with a mechanical mask. As described above, mechanical masks have various forms, and are not limited to the forms shown in each figure in FIG. 2, and can take any covering means.

As the plating method in the present invention, all conventional plating methods such as electrolytic plating and electroless plating can be used. Therefore, in the case of a long body made of an electrically insulating synthetic resin film, electroless plating can be applied. Using these plating methods, gold plating layer,
Silver plating layer.

A nickel plating layer or the like can be formed.

[Example] A long strip made of a copper alloy with a thickness of 0.2 t was rolled out from a roll, and a narrow masking tape with a width of 10 m was pasted on the outside of the border of the thin strip-shaped plated part. Then, the masking tape is placed over the non-plated area, and a belt-type mechanical mask is placed in close contact with the non-plated area.The plate is then introduced into the plating pre-treatment process, and then transferred to the silver strike treatment and silver plating treatment processes. Processed. After processing, the mechanical mask was removed and the masking tape was removed, yielding a plated product with silver stripes with sharp boundaries.

[Effects of the Invention] According to the present invention, when a strip-like elongated body is partially plated, the boundaries of the plated portions are clear, and subsequent positioning during stamping and mounting molding, for example, is ensured. For example, in the case of laminated plating structures such as nickel plating, copper plating, silver strike, etc. as a base treatment for silver plating, problems such as protrusion of the plating boundary and pyramids can be solved, which has advantages in terms of the quality of the material to be plated. Furthermore, the cost of relatively expensive masking tape can be significantly saved, and even in the form of a mechanical mask, it does not itself form the plating boundary, so it can be used, for example, to make use of inexpensive elastic material. It is sufficient to use a rough masking device such as a masking device, so replacing the masking device is also inexpensive. It has a significant economic effect, such as reducing the amount of water used.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are cross-sectional views specifically showing the process of the plating method of the present invention, and FIG. 2(a). (b) and (C) are conceptual diagrams each showing various mechanical mask means. 1... Material to be plated (long body). 2...Masking tape. 3... Mechanical mask (3-a... Mechanical mask that comes into contact with pressure. 3-b... Mechanical mask of air jet device. 3-C... Inexpensive adhesive tape machine that can be used repeatedly) mask.) Agent Patent attorney Fujio Sato 1 House worker, 7 hours old man (child, mff) 277 beef nukutefu 0 3 second manuku

Claims (1)

[Claims] (1) Attach a masking tape of the required minimum width to the outer periphery of the part to be partially plated on the long strip body, overlap the masking tape and place a mechanical mask on the outside, and then apply the plating. A partial plating method for a long belt-like object, which is characterized by applying a treatment.