JPH0741988A - Partial plating method for resin product - Google Patents

Abstract

PURPOSE:To surely prevent the formation of electroplating layer in a part where plating is not required. CONSTITUTION:A grill body 2 is subjected to electroless plating, by which an electroless plating layer 15 is substantially formed in the entire part on the front surface exclusive of bottom 11a of line groove 11 having an approximately V-shaped section. The electroless plating layer 15 of the boundary part between the part where the plating is required and the part where the plating is not required is cut by using a cutter 20 and sliding the part of the line groove 11. Even if the electroless plating layer 15 is formed in the bottom 11a of the line groove 11, the electrical conduction of the part where the plating is not required is no longer electrically conducted at the time when the part where the plating is required, is electrically conducted in the ensuing electroplating stage. Then, the formation of the electroplating layers in the part where the plating is not required does not arise. In addition, the electroless plating layer 15 of the part where the plating is not required is dissolved in the respective plating solns. in the electroplating stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partial plating of a resin product in which a plating layer is formed only on a portion of the surface of a resin base material which requires plating.

[0002]

2. Description of the Related Art Conventionally, as this type of technology, there is one proposed in Japanese Patent Application No. 5-83603 filed by the present applicant. In this technique, for example, as shown in FIG. 13, first, a groove 5 having a substantially V-shaped cross section is formed in the step portion 51 by molding.
2 is formed into a ring-shaped grill body 53, and the grill body 53 is electroless plated. At this time, the groove 5
In the bottom portion 52a of No. 2, since the gap distance is narrow, plating is not performed, and the electroless plating layer 54 is formed in all the portions except these. Next, the grill body 53 on which the electroless plating layer 54 is formed is subjected to electroplating. This electroplating process is specifically composed of a multi-step process such as a strike plating process, a copper plating process, a nickel plating process and a chromium plating process. Then, in the series of electroplating steps, the electroless plating layer 54 formed in the portion not requiring plating is gradually dissolved by the electroplating solution in each step. On the other hand, in a portion requiring plating, an electroplating layer 55 including a strike plating layer, a copper plating layer, a nickel plating layer, and a chromium nickel layer is sequentially formed on the surface of the electroless plating layer 54 by energization. Thus, the electroless plating layer 54 and the electroplating layer 5
The electroplated mask 57 covers the portion where the plating layer 56 of 5 is formed, and coating is applied to the exposed portion to form a coating layer 58.

Therefore, by going through the above steps, a front grill can be obtained in which the plating layer 56 is formed only in the necessary portions and the coating layer 58 is formed directly on the grill body 53 in the other portions.

[0004]

However, in the above-mentioned prior art, if electroless plating is applied to the bottom portion 52a of the groove 52, the gap between the grooves 52 may be changed in the electroplating process. There was a risk of a short circuit. In such a case, the electroplating layer 55 is formed even in a portion that does not require plating, and as a result, a desired partially plated product may not be obtained.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a resin product in which a plating layer is formed only on a portion of the surface of a resin base material which requires plating. In a partial plating method, it is an object of the present invention to provide a partial plating method for a resin product, which can surely prevent electroplating from being formed on a portion where plating is unnecessary.

[0006]

In order to achieve the above object, in the first invention, a resin product having a plating layer formed only on a portion of the surface of a resin base material which requires plating is provided. A partial plating method, which comprises an electroless plating step of forming an electroless plating layer on the surface of the base material, and a boundary line between a part requiring plating and a part not requiring plating on the surface of the base material. Along, along with the electroless plating cutting step of cutting the electroless plating layer to form a ring or a part of the ring, of the electroless plating layer formed on the substrate through the electroless plating cutting step Of these, an electroplating step of electrically conducting a portion requiring plating to form an electroplating layer on the portion requiring plating on the electroless plating layer is summarized.

Further, in the second invention, there is provided a partial plating method for a resin product, wherein a plating layer is formed only on a portion of the surface of the resin base material which requires plating, and A step portion forming step of forming a step portion so as to form a ring or a part of the ring at a boundary portion between a portion that requires plating and a portion that does not require plating, on the surface of the base material. And an electroless plating step of cutting the electroless plating layer along the step portion so as to completely cut off electrical conduction between the electroless plating layers sandwiching the step portion. Cutting step, of the electroless plating layer formed on the base material through the electroless plating cutting step, by electrically conducting a necessary portion of the plating, it is necessary to perform plating on the electroless plating layer. Electroplating layer is formed on the part That it has a gas-plating process has as its gist.

Further, in the third invention, there is provided a partial plating method for a resin product, wherein a plating layer is formed only on a portion of the surface of the resin base material which requires plating.
A groove forming step of forming a groove in an annular shape or in a part of an annular shape in a boundary line between a portion requiring plating and a portion not requiring plating on the surface of the base material,
In order to completely cut off the electroless plating step of forming an electroless plating layer on a portion other than the bottom of the groove on the surface of the base material and the electrical conduction between the electroless plating layers sandwiching the groove, the groove is formed. An electroless plating cutting step of cutting the electroless plating layer along with, of the electroless plating layer formed on the base material that has undergone the electroless plating cutting step, electrically conducts a necessary portion of plating. And an electroplating step of forming an electroplating layer on a portion of the electroless plating layer where plating is required.

[0009]

According to the structure of the first invention, the electroless plating layer is formed on the surface of the base material in the electroless plating step. In the electroless plating cutting step, the electroless plating layer may form a ring or a part of a ring along the boundary line between the part requiring plating and the part not requiring plating on the surface of the base material. To be disconnected. Then, in the electroplating step, among the electroless plating layers formed on the base material,
The portion requiring plating is electrically conducted, and the electroplating layer is formed on the portion requiring plating on the electroless plating layer. On the other hand, a portion of the electroless plating layer that does not require plating is dissolved by the plating solution in the electroplating process.

Therefore, in the electroplating step, when the portion requiring plating is electrically conducted, the portion requiring plating is not electrically conducted with the portion not requiring plating. It is surely insulated. Therefore, the electroplating layer is not formed in the portion that does not require plating.

According to the structure of the second invention, in the step of forming the step, the step is formed on the boundary of the surface of the base material between the part requiring plating and the part not requiring plating. Are formed in a ring shape or as a part of a ring shape. Further, in the electroless plating step, an electroless plating layer is formed on the surface of the base material. Further, in the electroless plating cutting step, the electroless plating layer is cut along the step portion. By this cutting, electrical conduction between the electroless plating layers sandwiching the step portion is completely cut off. Then, in the electroplating step, of the electroless plating layer formed on the base material, the portion requiring plating is electrically conducted, and the electroplating layer is formed on the portion requiring plating on the electroless plating layer. It is formed.

Therefore, as in the first aspect of the invention, in the electroplating step, when the portion requiring plating is electrically conducted, the portion requiring plating is electrically connected with the portion not requiring plating. It is not electrically connected, but is surely insulated. Therefore, the electroplating layer is not formed in the portion that does not require plating. Moreover, when the electroless plating layer is cut, it is easily cut along the step portion.

Further, according to the structure of the third aspect of the invention, in the groove forming step, the groove is formed on the surface of the base material at the boundary between the portion requiring plating and the portion not requiring plating. Are formed in a ring shape or as a part of a ring shape. In the electroless plating step, the electroless plating layer is formed on the surface of the base material other than the bottom of the groove. At this time, since the plating solution does not reach the bottom of the groove, the electroless plating layer is hardly formed. Therefore,
Basically, the electroless plating layer is formed on the surface of the substrate other than the bottom of the groove. Then, in the electroless plating cutting step, the electroless plating layer is cut along the groove. Therefore, even if the electroless plating layer is formed at the bottom of the groove, the cutting completely cuts off electrical conduction between the electroless plating layers sandwiching the groove. After that, in the electroplating step, the electroless plating layer formed on the base material is electrically connected to the portion requiring plating, and the electroplating layer is formed on the portion requiring plating on the electroless plating layer. It is formed.

Therefore, like the first and second inventions, in the electroplating step, when a portion requiring plating is electrically conducted, the portion requiring plating is a portion not requiring plating. It is not electrically connected, but is reliably insulated. Therefore, the electroplating layer is not formed in the portion that does not require plating. Moreover, when the electroless plating layer is cut, it is easily cut along the groove.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a vehicle front grill 1 as a resin product will be described with reference to FIGS.

A front grill 1 as shown in FIG. 2 is mounted on the front surface of the vehicle. Figures 2, 3,
As shown in FIG. 7, the front grill 1 includes a front grill main body (hereinafter referred to as a grill main body) 2 as a base material made of ABS resin, and a part of its design surface, that is, a part of the front surface. The formed plating layer 3 (Fig. 3
Has a mesh-like portion) and a coating layer 4 applied and formed on a portion other than the plating layer 3 (excluding a part on the back side). More specifically, the front grill 1
Is a frame 5 having a substantially rectangular front shape, a plurality of sub-partition plates 6 extending in the horizontal direction within the frame 5, a plurality of connecting plates 7 extending in the vertical direction within the frame 5, and a mark plate (not shown) in the central portion. Mounting plate 8 and frame 5 for mounting
It has a main partition plate 9 extending from to the mounting plate 8. The plating layer 3 is formed mainly on the front side portion of the frame 5 and on the front side portion of the main partition plate 9. The coating layer 4 is formed mainly on the front side portions of the sub partition plate 6, the mounting plate 8 and the connecting plate 7.

FIG. 4 is an enlarged front view showing a part (α portion in FIG. 3) of the main partition plate 9, and FIG. 5 is an AA line in FIG.
It is a line sectional view. As shown in these figures and FIG. 3 and FIG. 7, in the front side portion of the grill main body 2, a boundary portion between the plating layer 3 and the coating layer 4 is vertically extended from the frame 5 and the main partition plate 9. The protruding front side step portion 10 is formed in an annular shape. And, in the front side step portion 10,
A groove 11 having a substantially V-shaped cross section is formed in an annular shape (closed curve shape). Further, FIG. 6 is a back view showing a part of the back side of the frame 5 (β portion in FIG. 3) in an enlarged manner. As shown in the figure,
On the back surface side portion of the grill main body 2, a boundary portion between the plating layer 3 and a portion where the plating layer 3 is not formed,
A groove 13 having a substantially V-shaped cross section is formed in an annular shape. Further, on the rear surface side portion of the grill body 2, an electrode projection 14 is formed so as to project in the rear surface direction (vehicle rear direction).

As shown in FIG. 7, the plating layer 3 comprises an electroless plating layer 15 and an electroplating layer 16. In this embodiment, the electroless plating layer 15 is made of copper and has a thickness of about 0.3 to 0.4 μm. The electroplating layer 16 has a thickness of “20 to 50 μm”.
It is formed to have a size of about "m" and is formed by a multi-layer metal plating. More specifically, the electroplating layer 16 is composed of a strike nickel plating layer, a copper plating layer, a semi-bright nickel plating layer, a bright nickel plating layer, and a chromium plating layer (all not shown) in that order from the lower layer. It is formed by metal plating.

The widths W of the both grooves 11 and 13 are each "0.5 mm" and the depth D thereof is "0.5 mm". However, the width W is not particularly limited, but is preferably "0.2 mm" or more due to processing restrictions, and is preferably "1.0 mm" or less in order to improve the designability. The depth D is also not particularly limited, but is preferably "0.2 mm" or more due to the processing limitation and "0.
6 mm "or less is preferable. Further, the ratio of the depth D to the width W (D / W) is not particularly limited, either.
"1.0" or more is preferable.

Next, the mold 21 for molding the grill body 2 will be described. As shown in FIG. 8, the mold 21 includes a fixed mold 22 and a movable mold 23. A cavity 24 for molding the grill body 2 is formed by these two molds 22 and 23. However, in the movable die 23 (or the fixed die 22),
The projections 26 and the like for forming the are integrally formed.

Further, various plating solutions for forming each metal plating constituting the electroplating layer 16 will be described. First, the plating solution for forming the strike plating layer that forms the lowermost layer of the electroplating layer 16 is nickel sulfate 250 g / L, nickel chloride 30 g / L, and boric acid 30.
It contains g / L.

The plating solution used to form the copper plating layer is copper sulfate 200 g / L, sulfuric acid 50 g / L, hydrochloric acid 0.
It contains 01 g / L and a slight amount of brightener. further,
The plating solution for forming the semi-bright nickel plating layer is
Nickel sulfate 280 g / L, nickel chloride 45 g / L,
It contains 40 g / L of boric acid and a slight amount of brightening agent. In addition, the plating solution for forming the bright nickel plating layer is nickel sulfate 240 g / L, nickel chloride 45 g /
L, boric acid 30 g / L and a slight amount of brightening agent and additives. In addition, the plating solution for forming the chromium plating layer contains chromic anhydride 250 g / L, sodium silicofluoride 10 g / L, and sulfuric acid 1 g / L.

Further, in this embodiment, a device for cutting the electroless plating layer 15 which may be formed on the bottom portions 11a, 13a of the grooves 11, 13 in the step before forming the strike plating layer. Is provided. As shown in FIG. 1, this device includes a cutter 20, an actuator that drives the cutter 20, and a controller (not shown) that controls the operation of the actuator.

Next, the operation and effect of manufacturing the front grill 1 will be described. First,
The melted ABS resin is injected and filled in the cavity 24 by a known die molding method (see FIG. 8). When the resin is cooled and solidified, both molds 22 and 23 are opened and the grill body 2 is taken out. At this time, both molds 22, 2
3 is opened in parallel with the mold opening direction, that is, in the direction in which the protrusions 26 and the like come out. Therefore, the mold opening is not hindered by the protrusions 26 and the like, and the grill body 2 can be easily taken out. In this way, the grill main body 2 in which the grooved grooves 11 and 13 are annularly formed at predetermined locations is obtained.

Subsequently, the grill body 2 is immersed in an electroless plating solution to perform electroless plating. That is, the grill body 2 is first immersed in the electroless plating solution.
Here, as shown in FIG. 9, the bottom portion 1 of the both groove portions 11, 13 is
In 1a and 13a, since the gap is narrow, the plating solution basically does not reach (however, in FIGS. 1 and 7 and 9 to 12, for convenience of description, the front side groove 11
However, the same can be said for the groove 13 on the rear surface side). Therefore, these bottom parts 11a, 13a
Is basically not plated. In other words, the electroless plating layer 15 made of copper is formed on all portions of the surface of the grill body 2 except the bottom portions 11a and 13a.

Next, as shown in FIG. 1, in the electroless plating cutting step, the grill main body 2 on which the electroless plating layer 15 is formed is subjected to the above cutting device. That is, the cutter 20 is slid along the bottom portions 11a and 13a of the grooves 11 and 13. By this sliding, the electroless plating layer 15 is completely cut, and the electrical continuity between the electroless plating layers 15 sandwiching the grooves 11 and 13 is completely cut off. Here, the determination of whether or not the electrical continuity is completely cut off can be easily performed by adopting a continuity test using a tester.

Subsequently, in an electroplating process including a strike plating process, a copper plating process, a semi-bright nickel plating process, a bright nickel plating process and a chrome plating process, the grill main body 2 is dipped in a predetermined plating solution and the plating is performed. Make necessary parts electrically conductive. Through the series of electroplating steps, as shown in FIG. 10, the electroplating layer 16 is formed on the electroless plating layer 15 at a portion where plating is required. On the other hand, the electroless plating layer 15 in the portion not requiring plating is dissolved in a predetermined plating solution because it is not electrically conducted. Therefore, the electroplating layer 16 is not formed in the unnecessary plating portion. That is, it is possible to reliably prevent the electroplating layer 16, and thus the plating layer 3, from being formed in the portion that does not require plating.
In this way, the plating layer 3 including the electroless plating layer 15 and the electroplating layer 16 is reliably formed only in the portion where plating is required.

After that, as shown in FIG. 11, the plating layer 3
The portion on which is formed is covered with the electroforming mask 27.
That is, the electroformed mask 27 is a metal plate having a thickness of “several mm” and has a shape conforming to the shape of the front grill 1. Further, the electroforming mask 27 is appropriately formed with an opening 28 that is opened only in a portion necessary for forming the coating layer 4. By covering the electroformed mask 27, a portion necessary for forming the coating layer 4 is exposed from the opening 28.

Then, as shown in FIG. 12, spray coating is applied to the exposed portion outside thereof. By this coating, the coating film layer 4 is formed on the required portions of the coating film. On the other hand, the coating layer 4 is formed on the portion covered with the electroforming mask 27.
Are not formed.

After the coating layer 4 is formed, as shown in FIG. 7, the coating of the electroformed mask 27 is released to obtain the front grill 1 described above. That is, the plating layer 3 is provided mainly on the front side portion of the frame 5 and on the front side portion of the main partition plate 9, and the sub partition plate 6 and the mounting plate 8 are provided.
Further, the front grill 1 having the coating layer 4 mainly on the front side portion of the connecting plate 7 can be obtained.

As described above, according to this embodiment,
When forming the above electroless plated layer 15, basically, the electroless plated layer 15 is not formed on the bottom portions 11a and 13a of the grooves 11 and 13. Then, in the electroless plating cutting step, the electroless plating layer 15 is cut along the grooves 11 and 13 by the cutting device including the cutter 20. Therefore, by any chance, the bottom part 11 of the groove 11, 13
Even if the electroless plating layer 15 is formed on a and 13a, the cutting completely cuts off the electrical conduction between the electroless plating layers 15 sandwiching the grooves 11 and 13. Therefore, in the subsequent electroplating step, when the portion requiring the plating is electrically conducted, the portion requiring the plating is not electrically conducted with the unnecessary portion of the plating. Insulated. Therefore, the electroplating layer 16 is not formed in a portion that does not require plating. As a result, it is possible to reliably prevent the plating layer 3 from being formed in the unnecessary plating portion.

Moreover, when cutting the electroless plating layer 15, the cutter 20 may be slid along the grooves 11, 13. Therefore, the electroless plating layer 15 can be easily cut.

Further, in the present embodiment, the plating layer 3 can be formed only in the necessary portion. Therefore, when forming the coating layer 4, without interposing a primer layer,
The coating layer 4 can be directly formed on the grill body 2. As a result, the step of forming the primer layer is unnecessary, so that it is possible to reduce the number of work steps and the cost. In addition, the electroplating layer 16 is formed on the entire surface of the grill body 2.
Since it is not necessary to form, the cost can be reduced accordingly.

At the same time, in the front grill 1, the coating layer 4 is directly formed on the grill body 2. Therefore, the thickness of the portion is reduced by the amount that the plating layer 3 and the primer layer are not interposed. As a result, the thickness of the coating film layer 4 portion can be reduced, and the appearance quality can be improved. Further, since the coating layer 4 and the grill body 2 are both made of a resin material, the coating layer 4 can be firmly bonded to the grill body 2. Therefore, the durability of the coating layer 4 of the front grill 1 can be improved.

In addition, in this embodiment, the groove 11 on the front side serves as a boundary between the coating layer 4 and the plating layer 3. For this reason, the parting portion of the boundary portion is clearly formed instead of the zigzag shape. As a result, the parting line can be made clear and clear, and further, the appearance quality can be further improved.

The present invention is not limited to the above-described embodiment, but may be implemented as follows with a part of the configuration appropriately changed without departing from the spirit of the invention. (1) In the above embodiment, the groove 11 is previously formed in the grill body 2,
13 is formed in advance and the electroless plating layer 15 is formed along the line 13.
To disconnect. However, such a groove 11,
It may be embodied when the electroless plating layer 15 is cut immediately before the electroplating step without forming 13. Further, in such a case, the cutter 20 may be slid and cut along a step such as the front step 10.

(2) In the above embodiment, the case where the mechanical type cutter 20 is used for cutting is embodied, but in addition to that, the case where the water jet, laser cutter or the like is used for cutting is used. Good.

(3) In the above-described embodiment, the electroplating process is composed of five processes including the strike plating process, and the electroplating layer 16 made of a plurality of metal platings is formed. The order of the steps, the number of steps, the type of plating, etc. are not particularly limited. Therefore, for example, one step can be omitted, the order of the plating steps can be changed, or another plating step can be introduced.

(4) In the above embodiment, the present invention is embodied in the front grille 1 for a vehicle. In addition to this, the outer cover for the door mirror bracket for the vehicle, the back panel, the louver, the pillar garnish, the quarter vent, It may be embodied as a mark plate or the like. Further, the present invention is not limited to the above resin products, and the present invention may be embodied in other resin products partially having a plating layer.

(5) In the above-mentioned embodiment, the resin material constituting the base material is made of ABS resin. However, in addition to this, various resin materials such as polypropylene, polyphenylene oxide, polyamide, polysulfone, polyester, etc. May be used.

(6) In the above embodiment, the mold 21
Although the grooves 11 and 13 are formed, each groove is
It may be formed by processing after molding with a C cutter, an ultrasonic cutter, or the like.

(7) The composition of each plating solution described in the above embodiment is not limited to the above.

[0043]

As described in detail above, according to the present invention,
In the partial plating method for resin products in which the plating layer is formed only on the portion of the resin base material that requires plating, the electroplating layer, and thus the plating layer, is formed on the portion where plating is unnecessary. It has an excellent effect that it can be surely prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the action when a non-electrolytic plating layer is cut by a cutter in one embodiment of the present invention.

FIG. 2 is a front view showing a front grille according to an embodiment.

FIG. 3 is a view showing a plated portion of the front grille in one embodiment, and is a schematic view of the front grille developed on the front surface and the back surface.

FIG. 4 is an enlarged front view showing a part of the main partition plate of the front grille in one embodiment.

5 is a cross-sectional view taken along the line AA of FIG. 4 in one embodiment.

FIG. 6 is an enlarged back view showing a part of the frame of the front grill in one embodiment.

7 is a cross-sectional view showing an enlarged main part of FIG. 5 in one embodiment.

FIG. 8 is a cross-sectional view showing, in an enlarged manner, a part of a mold for molding the grill body in one embodiment.

FIG. 9 is a partial cross-sectional view showing a state in which electroless plating is applied to the grill body in the embodiment.

FIG. 10 is a partial cross-sectional view showing a state in which electroplating is performed on the electroless plating layer that has undergone the electroless plating cutting step in one example.

FIG. 11 is a partial cross-sectional view showing a state in which an electroformed mask is coated on a portion of the grill body on which a plating layer is formed in one embodiment.

FIG. 12 is a partial cross-sectional view showing a state in which a coating layer is formed on a portion of the grill body where the plating layer is not formed, in one example.

FIG. 13 is a cross-sectional view of an essential part showing the vicinity of a groove of a front grill in a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front grille as a resin product, 2 ... Grill main body as a base material, 3 ... Plating layer, 10 ... Front side step part, 1
1, 13 ... Strip grooves, 11a, 13a ... Bottom portion, 15 ... Electroless plating layer, 16 ... Electroplating layer.

Claims (3)

[Claims] 1. A partial plating method for a resin product, wherein a plating layer (3) is formed only on a portion of a surface of a resin base material (2) that requires plating, wherein the base material (2) ) An electroless plating step of forming an electroless plating layer (15) on the surface, and along a boundary line between a portion requiring plating and a portion not requiring plating on the surface of the base material (2), An electroless plating cutting step of cutting the electroless plating layer (15) so as to form a ring or a part of a ring, and the electroless formed on the base material (2) after the electroless plating cutting step A portion of the plating layer (15) that needs to be plated is electrically connected to the portion of the electroless plating layer (15) that needs to be plated by the electroplating layer (1).
6) An electroplating step of forming 6), which is a partial plating method for a resin product. 2. A partial plating method for a resin product, wherein a plating layer (3) is formed only on a portion of a surface of a resin base material (2) that requires plating, wherein the base material (2 ), A step portion forming step of forming a step portion (10) in an annular shape or so as to form a part of an annular shape at a boundary portion between a portion requiring plating and a portion not requiring plating. Completely interrupting electrical conduction between the electroless plating step of forming the electroless plating layer (15) on the surface of the base material (2) and the electroless plating layer (15) sandwiching the step portion (10). Therefore, the electroless plating cutting step of cutting the electroless plating layer (15) along the step (10), and the electroless plating layer formed on the base material (2) after the electroless plating cutting step In (15), electrically connect the part requiring plating and Electroless plating layer (1
5) An electroplating step of forming an electroplating layer (16) on a portion where the above plating is required, a partial plating method for a resin product. 3. A method for partial plating of a resin product, wherein a plating layer (3) is formed only on a portion of a surface of a resin base material (2) that requires plating, wherein the base material (2) ) In the surface of (1), a groove is formed to form a groove (11, 13) in an annular shape or so as to form a part of an annular shape in a boundary portion between a portion requiring plating and a portion not requiring plating. And the electroless plating layer (1) on the surface of the base material (2) other than the bottoms (11a, 13a) of the groove (11, 13).
And an electroless plating layer (15) sandwiching the groove (11, 13).
In order to completely cut off the electrical continuity between them, the groove (11,
13) Among the electroless plating cutting step of cutting the electroless plating layer (15) along the step 13 and the electroless plating layer (15) formed on the base material (2) after the electroless plating cutting step, The electroless plating layer (1
5) An electroplating step of forming an electroplating layer (16) on a portion where the above plating is required, a partial plating method for a resin product.