阅读说明：本技术 树脂膜的湿式处理装置 (Wet processing device for resin film ) 是由 高德诚 中丸弥一郎 桥本康毅 吉冈秀夫 于 2019-12-25 设计创作，主要内容包括：本发明提供能够抑制镀敷催化剂从树脂膜表面脱落、镀敷液含的稳定剂的异常吸附,促进均匀的金属覆膜的形成的树脂膜的湿式处理装置。具备：处理槽,在内部存积处理液并使树脂膜在处理液中通过；一对运送部件,在处理槽的树脂膜的导入侧和排出侧,分别设置于比存积于处理槽内的处理液的液面高的位置；喷流单元,在一对运送部件之间配设于比该运送部件低的位置,在其周面设置使处理液从该周面喷出的多个孔,并利用来自该孔的喷流使树脂膜在处理液中沿着该周面非接触地进行方向转换；高位液罐,配设于比处理槽高的位置并经由处理液供给管向喷流单元供给处理液；处理液活化槽,设置于处理槽的树脂膜的导入侧；以及底部排液部,设置于处理槽的底部附近。(The invention provides a wet processing device for a resin film, which can inhibit a plating catalyst from falling off from the surface of the resin film and abnormal adsorption of a stabilizer contained in a plating solution, and promote the formation of a uniform metal coating. The disclosed device is provided with: a treatment tank for storing a treatment liquid therein and allowing the resin film to pass through the treatment liquid; a pair of conveying members provided at positions higher than the liquid level of the treatment liquid stored in the treatment tank, respectively, on the introduction side and the discharge side of the resin film in the treatment tank; a jet unit disposed between the pair of conveying members at a position lower than the conveying members, having a plurality of holes on a peripheral surface thereof for jetting the processing liquid from the peripheral surface, and converting the direction of the resin film in the processing liquid along the peripheral surface in a non-contact manner by the jet from the holes; a high-level liquid tank which is arranged at a position higher than the treatment tank and supplies the treatment liquid to the jet unit through a treatment liquid supply pipe; a treatment liquid activation tank provided on the introduction side of the resin film in the treatment tank; and a bottom drain section provided near the bottom of the treatment tank.)

1. A wet processing apparatus for a resin film, which comprises a resin film having a strip-like shape and a plating catalyst adsorbed on the surface thereof, and which is immersed in a predetermined processing liquid to thereby perform a film-coating process on the surface of the resin film,

the wet processing device for resin film comprises:

a processing tank in which the processing liquid is stored and the resin film is allowed to pass through the processing liquid;

a pair of conveying members provided at positions higher than a liquid surface of the processing liquid stored in the processing tank, respectively, on a side of the processing tank where the resin film is introduced and on a side of the processing tank where the resin film is discharged;

a jet unit disposed at a position lower than the conveying member between the pair of conveying members, the jet unit having a plurality of holes on a peripheral surface thereof, the plurality of holes being configured to discharge the processing liquid from the peripheral surface, and the jet unit being configured to change a direction of the resin film in the processing liquid along the peripheral surface without contact;

a high-level liquid tank which is disposed at a position higher than the treatment tank and supplies the treatment liquid to the jet unit via a treatment liquid supply pipe;

a treatment liquid activation tank provided on the introduction side of the resin film in the treatment tank; and

and a bottom drain section provided near the bottom of the treatment tank.

2. The wet processing apparatus for resin film according to claim 1,

the treatment solution activation tank is provided with a dummy plate.

3. The wet processing apparatus for resin film according to claim 1 or 2, characterized in that,

the discharge of the processing liquid from the bottom drain portion is performed by the hydraulic pressure of the processing liquid supplied from the high-level liquid tank.

4. The wet processing apparatus for resin film according to any one of claims 1 to 3,

a volume-free member is provided around the processing liquid supply pipe so as to extend in the width direction of the resin film.

5. The wet processing apparatus for resin film according to claim 4,

the volume idling member is provided with a jet flow guide portion that guides a jet flow above the processing bath, which is ejected from the jet flow unit, to a discharge side of the resin film.

6. The wet processing apparatus for resin film according to claim 5,

the spouting guide portion is a slit formed in the volume idling member.

7. The wet processing apparatus for resin film according to any one of claims 1 to 6, characterized in that,

an overflow groove for overflowing the processing liquid is provided outside the processing groove on the discharge side of the resin film.

8. The wet processing apparatus for resin film according to any one of claims 1 to 7,

a variable wall plate member is provided in the processing tank in the width direction of the resin film, and the distance between the variable wall plate member and the jet flow unit is variable.

9. The wet processing apparatus for resin film according to any one of claims 1 to 8,

the treatment solution is an electroless metal plating solution, and a metal film formed from the electroless metal plating solution functions as a seed layer for the formation of a subsequent wet metal film.

Technical Field

The present invention relates to a wet processing apparatus for a resin film, which performs a predetermined process on a surface of the resin film by immersing a strip-shaped resin film in a predetermined processing liquid, and more particularly, to a wet processing apparatus using an electroless plating method.

Background

The electroless plating method is a method of depositing a metal coating on the surface of an object to be processed by reducing metal ions with electrons released by an oxidation reaction of a reducing agent using a treatment liquid in which the metal ions and the reducing agent coexist. The electroless plating method can also be applied to a non-conductive material such as glass, plastic, or ceramic, and can also be applied to an object to be processed having a complicated shape, and therefore, for example, it is desired to apply the method to a thin and bendable flexible circuit board, particularly a metallized flexible copper-clad laminate in which a metal coating is formed on a film.

The present inventors have proposed a wet processing apparatus for a resin film capable of forming a good metal coating even for a belt-like resin film such as a polyimide film having a thickness of 12.5 μm which is extremely thin and difficult to process, in a processing apparatus using a general electroless plating method (see patent document 1).

Patent document 1: international publication WO2017/122229

Fig. 9 is a configuration diagram for explaining an overview of a wet processing apparatus 100 according to patent document 1 as a related art. The wet processing apparatus 100 is an apparatus for performing a plating process in a processing bath 101 containing a plating solution while conveying a strip-shaped resin film 110 such as a polyimide film. The wet processing apparatus 100 employs a so-called vertical conveyance system in which the resin film 110 is continuously conveyed by an introduction roller 102 provided on the introduction side and a discharge roller 103 provided on the discharge side of the resin film 110 in the processing tank 101, and a conveyance path that once descends and ascends again is formed in the processing tank 101. Further, a jet unit 104 for converting the direction of the resin film 110 in the plating solution along the circumferential surface 105 without contact is disposed at a position lower than the introduction roller 102 and the discharge roller 103.

A cylindrical peripheral surface 105 on the bottom side of the jet unit 104 is formed with a plurality of holes for discharging the plating solution supplied from a high-level liquid tank 107 connected through a plating solution supply pipe 106 at a predetermined hydraulic pressure. The resin film 110 continuously conveyed in the processing bath 101 is conveyed without contact with the jet unit 104 by the pressure of the plating solution discharged from the hole, and therefore there is no possibility that the thin resin film is damaged or broken. Therefore, according to the wet processing apparatus of patent document 1, a resin film having a high-quality metal coating film with high productivity can be provided as compared with the conventional batch-type processing apparatus.

However, in the above-described wet processing apparatus, when electroless nickel plating is performed on a resin film for FPC (Flexible Printed circuit) use in which a plating catalyst such as palladium is adsorbed on the surface, if the liquid impact of the plating liquid on the resin film is strong, plating does not precipitate, so-called scratches may occur particularly in the positioning holes and the like around TH (through holes) and at the edge portions of the resin film. Factors for the generation of scratches include peeling of a plating catalyst such as palladium from the surface of a resin film, abnormal adsorption of a stabilizer contained in a plating solution, and the like.

In a general electroless plating treatment for a decorative ABS (Acrylonitrile Butadiene Styrene) resin or the like, a resin to which a plating catalyst is added is immersed in a plating solution and left to stand for 30 seconds to 1 minute, in a stage where the generation of hydrogen gas accompanying the plating reaction becomes vigorous, for example, by performing air stirring or shaking, thus, even in the electroless plating process using the wet processing apparatus of patent document 1, when the formation of a uniform metal coating is completed, it is also preferable to provide a step of immersing the resin film to which the plating catalyst has been added in a plating solution and allowing the resin film to stand for 30 seconds to 1 minute, however, since this wet processing apparatus performs electroless plating by continuous processing by a roll-to-roll method, it is difficult to set a rest time of 30 seconds to 1 minute in practice.

Disclosure of Invention

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wet processing apparatus for a resin film, which can promote formation of a uniform metal coating film by suppressing detachment of a plating catalyst from the surface of the resin film and abnormal adsorption of a stabilizer contained in a plating solution in a wet processing apparatus for performing electroless plating processing on a strip-shaped resin film by continuous processing by a roll-to-roll method.

The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by rectifying the flow of the plating solution in the conveying (traveling) direction of the resin film by supplying the activated plating solution from the inlet side of the treatment tank and discharging the plating solution from a bottom discharge part provided in the vicinity of the bottom of the treatment tank, and have finally completed the present invention.

That is, the present invention is a wet processing apparatus for a resin film, which is configured to perform a film coating process on a resin film surface by immersing a belt-shaped resin film, on the surface of which a plating catalyst is adsorbed, in a predetermined processing liquid, the apparatus including: a treatment tank for storing the treatment liquid therein and allowing the resin film to pass through the treatment liquid; a pair of conveying members provided at positions higher than a liquid level of the processing liquid stored in the processing tank, respectively, on a side of the processing tank where the resin film is introduced and on a side of the processing tank where the resin film is discharged; a jet unit disposed at a position lower than the conveying member between the pair of conveying members, the jet unit having a plurality of holes on a peripheral surface thereof, the plurality of holes jetting the processing liquid from the peripheral surface, and the resin film being converted in direction in the processing liquid along the peripheral surface by jets from the holes without contact; a high-level liquid tank which is disposed at a position higher than the treatment tank and supplies the treatment liquid to the jet unit via a treatment liquid supply pipe; a treatment liquid activation tank provided on the introduction side of the resin film in the treatment tank; and a bottom drain section provided near the bottom of the processing tank.

According to the present invention, it is possible to provide a wet processing apparatus for a resin film, which performs an electroless plating process on a strip-shaped resin film by a roll-to-roll continuous process, and which can promote the formation of a uniform metal coating by suppressing the detachment of a plating catalyst from the surface of the resin film and the abnormal adsorption of a stabilizer contained in a plating solution.

Drawings

Fig. 1 is a configuration diagram for explaining an overview of a plating apparatus 10 according to the present embodiment.

Fig. 2 is a cross-sectional view taken along line 2-2' of fig. 1.

Fig. 3 is a sectional view taken along line 3-3' of fig. 1.

Fig. 4 is a diagram illustrating the structure of a model plating apparatus for verification.

Fig. 5 is a diagram showing the result of verification using the model plating apparatus described in fig. 4.

Fig. 6 is a diagram illustrating a first modification of the present embodiment.

Fig. 7 is a diagram illustrating a second modification of the present embodiment.

Fig. 8 is a diagram illustrating a third modification of the present embodiment.

Fig. 9 is a configuration diagram for explaining an overview of a wet processing apparatus 100 according to patent document 1 as a related art.

Description of the reference numerals

10. 60, 61, 62, 63, 70, 80, 90 … plating apparatus; 11. 110 … treatment tank; 13 … lead-in roller; 15 … exit roller; 17. 170 … jet unit; 19 … circumferential surface; 20 … resin film; 21 … holes; 23 … plating solution supply pipe; 25. 25' … volume void component; 27 … high-level liquid tank; 29. a 51 … pump; a 31 … flow meter; 33. a 37 … valve; a 35 … sump; 39 … drain valve; 40. 402 … dummy crates; 41. 410 … a dummy board; 50. 501 … bottom drain; 81 … overflow trough; 83 … drain pipe; 91 … convertible wall panels; 131 … auxiliary lead-in rollers; 151 … assist in ejecting rollers; 251 … slits; 401 … box.

Detailed Description

Embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following description, and can be modified as appropriate without departing from the spirit of the present invention. The drawings are schematic, and the sizes and the like may differ from the actual sizes. The specific dimensions should be determined with reference to the following description. It is to be understood that the drawings also include portions having different dimensional relationships and ratios.

In the present embodiment, an apparatus for forming a nickel thin film to be a seed layer by electroless plating, for example, which is installed in a production line for manufacturing a flexible copper-clad laminate in which a copper layer is formed as a conductive layer on a resin film such as a polyimide film, will be described as an example.

As shown in fig. 1, a plating apparatus 10 as a wet processing apparatus according to the present embodiment is an apparatus that carries a resin film 20 such as a polyimide film in a belt shape while generally performing a plating process using a plating solution as a processing solution, and employs a so-called vertical carrying method in which the resin film 20 is continuously carried in a horizontal direction perpendicular to a carrying direction, and a carrying path that once descends and ascends again as shown in a film traveling direction MD is taken in a processing tank 11. In this way, when passing through the plating solution, the plating solution does not vibrate in the vertical direction but in the horizontal direction, and bubbles generated in the plating solution and adhering to the surface of the resin film 20 are released from the surface of the resin film 20 in the plating solution, so that when a metal thin film is formed by plating, adverse effects due to the bubbles can be minimized, and the occupied area of the entire manufacturing line can be reduced.

The plating apparatus 10 includes a treatment tank 11 for storing a plating solution therein and allowing the resin film 20 to pass through the plating solution in order to impregnate the resin film 20 with the plating solution, and includes a guide roller 13 and a discharge roller 15 as a pair of conveying members provided at positions higher than a liquid level of the plating solution stored in the treatment tank 11 on a guide side of the resin film 20 and a discharge side of the resin film 20 in the treatment tank 11, respectively. Between the introduction roller 13 and the discharge roller 15, a jet unit 17 is disposed at a position lower than the introduction roller 13 and the discharge roller 15, and the jet unit 17 changes the direction of the resin film 20 along the peripheral surface 19 in the plating solution in a non-contact manner.

The jet unit 17 is a hollow member having a cylindrical bottom side and a rectangular top side, and is formed by processing a resin such as PVC (polyvinyl chloride), for example. In addition, the jet unit 17 is provided to have a size wider than the width of the resin film 20 in the width direction of the resin film 20. The jet unit 17 is fixed to the treatment tank 11 at an end portion in the width direction, for example, but may be detachable from the treatment tank 11, may be configured to be movable in the treatment tank 11 instead of being fixed, or may be suspended from and supported by an upper portion of the treatment tank 11. A plurality of holes 21 for discharging the plating solution from the peripheral surface 19 are formed in the cylindrical peripheral surface 19 on the bottom side of the jet unit 17, and the resin film 20 to be conveyed is conveyed without contact with the jet unit 17 by the pressure of the plating solution discharged from the holes 21. The holes 21 are through holes of a plate constituting the cylindrical peripheral surface 19 on the bottom side of the jet unit 17, for example, arranged in parallel and penetrating the peripheral surface 19, and a plurality of holes 21 having the same diameter may be provided or holes 21 having different diameters may be mixed. A structure of the jet unit 17, particularly, a specific example of an installation angle of the hole 21 on the peripheral surface 19, and the like are disclosed in international publication WO 2017/122229.

A plating solution supply pipe 23 as a treatment solution supply pipe is connected to the jet unit 17, and the plating solution supplied through the plating solution supply pipe 23 is discharged from the jet unit 17 at a predetermined hydraulic pressure in the treatment tank 11. Further, a volume idling member 25 is provided around the plating solution supply pipe 23 so as to extend in the width direction of the resin film 20. The volume vacancy member 25 is a member for reducing the amount of plating liquid as much as possible, and can be formed by processing a resin such as PVC, for example. A jet unit 17 for transporting the resin film 20 in a non-contact manner is connected to the lower end of the plating solution supply pipe 23, and a high-level liquid tank 27 is disposed at a position higher than the processing bath 11 at the upper end of the plating solution supply pipe 23. The high-level liquid tank 27 is a tank that temporarily stores the plating solution supplied by the pump 29 and supplies the plating solution to the jet unit 17, and can suppress pulsation of the plating solution caused by operation of the pump 29 with respect to the jet unit 17. The plating solution supply pipe 23 connecting the high-level liquid tank 27 and the jet unit 17 is provided with a flow meter 31 and a valve 33, and the flow rate of the plating solution supplied from the high-level liquid tank 27 to the jet unit 17 can be adjusted by operating the valve 33, and the flow rate is monitored by the flow meter 31. The plating solution from the high-level liquid tank 27 falls by its own weight, and the plating solution is discharged from the jet unit 17 into the processing bath 11. In order to stably convey the resin film 20 in a non-contact manner, the control of the valve 33 provided in the middle of the plating solution supply pipe 23 is also effective, and the angle adjustment of the plating solution from the jet unit 17 is also effective. The size of the hole 21 formed in the peripheral surface 19 of the jet unit 17 may be controlled by a known method, and the height of the high-level liquid tank 27 may be adjusted.

The plating solution in the tank 35 is pumped up by the pump 29 through the valve 37, and the plating solution pumped up by the pump 29 is supplied to the high-level tank 27. A drain valve 39 is provided at the bottom of the high-level tank 27, and the plating solution in the high-level tank 27 can be returned to the tank 35 by opening the drain valve 39.

The processing tank 11 has a rectangular structure with an upper side opened for conveying the resin film 20, and a dummy plate box 40 as a processing liquid activation tank is provided on the introduction side of the resin film 20. Here, the structure of the dummy plate box 40 according to the present embodiment will be described with reference to fig. 2. FIG. 2 is a sectional view taken along line 2-2' of FIG. 1, and is a view seen from the upper side of the treating bath 11 in the Y-axis direction of FIG. 1. As shown in fig. 2, the dummy plate case 40 is formed in a rectangular shape with an upper side opened so as to be able to accommodate a plurality of dummy plates 41. Fig. 2 shows an example in which two dummy plate cases 40 that house four dummy plates 41 are provided so as to sandwich the processing bath 11. In addition, the arrows shown in fig. 2 indicate the flow of the plating solution. The dummy plate 41 is responsible for promoting activation of the plating solution, for example, generation of atomic hydrogen in the initial stage of the plating reaction, and for loading the plating solution in the electroless plating reactionMaintained in a preferred range (1 to 2 dm)²L), the material, shape, size, number (number) and the like of which can be appropriately changed depending on the composition of the plating solution used for the plating reaction, the plating solution amount, the plating solution flow rate, the volume of the treatment tank 11, the plating reaction temperature and the like, for example, a member obtained by modifying the surface of a polyimide resin film excellent in flexibility, heat resistance and chemical resistance can be used as the dummy plate 41. specifically, a polyamic acid modified layer is formed on the surface of a polyimide resin film by an alkaline wet modification method, palladium ions are adsorbed on the surface by a palladium-based catalyst, and then reduction treatment is performed to reduce and metalize the adsorbed palladium ions to form a hydrophilic surface modified layer²)。

Referring back to fig. 1, bottom drain portions 50 for draining the plating solution to the outside of the processing bath 11 at a predetermined hydraulic pressure are provided at two locations near the bottom of the processing bath 11. Most of the plating solution in the treatment bath 11 forms a plating solution flow F indicated by an arrow in fig. 1, but a part of the plating solution is discharged to the outside of the treatment bath 11 by the hydraulic pressure of the plating solution supplied from the high-level tank 27. The discharged plating solution is collected by being pumped up by the pump 51, and is supplied to the dummy plate box 40 again or discharged to the outside of the system.

FIG. 3 is a sectional view taken along line 3-3' of FIG. 1, as viewed from the side of the treatment tank 11 in the direction of the X-axis of FIG. 1. As shown in fig. 3, a part of the plating solution is discharged to the outside of the treatment bath 11 through the bottom drain section 50. On the other hand, the plating solution discharged from the jet unit 17 collides with the resin film 20 to form a jet plating solution flow UF indicated by a broken-line arrow in the figure, but a part thereof flows between the jet unit 17 and the resin film 20 or between the jet unit 17 and the volume vacancy member 25 and is discharged to the outside of the treatment tank 11 as a plating solution discharge flow EF. By providing the bottom drain portion 50 in the vicinity of the bottom of the processing bath 11, the plating liquid flow F of the plating liquid supplied from the dummy plate box 40 can be made in the same direction as the traveling direction MD of the resin film 20, and the plating deposition property can be improved.

Fig. 4 and 5 are diagrams for explaining the effect of rectifying the plating liquid flow F of the plating solution in the direction MD of the traveling direction of the resin film 20 at the initial stage of the plating reaction. Fig. 4 is a diagram illustrating the structure of a model plating apparatus used for the verification, and fig. 5 is a diagram showing the verification result. In the verification shown in fig. 4 and 5, a polyimide film having palladium adsorbed as a plating catalyst was used as the resin film 20, and a method using hypophosphorous acid as a reducing agent in the electroless nickel plating treatment was used.

The case (1) shown in fig. 4 is an example of the plating apparatus 60 having a tank 401 without a dummy plate and configured to overflow the plating solution from the treatment bath 110 to the tank 401. The plating solution pumped up from the tank 401 by the pump P is supplied to the jet unit 170. The case (2) is an example of the plating apparatus 61 having a tank 401 without a dummy plate and configured to discharge the plating solution from a bottom drain portion 501 provided at the bottom of the processing bath 110. The plating solution pumped up from the bottom drain portion 501 by the pump P is supplied to the jet unit 170. The case (3) is an example of the plating apparatus 62 having the dummy plate case 402 in which the dummy plate 410 is accommodated and configured to discharge the plating solution from the bottom drain portion 501 provided at the bottom of the processing bath 110. The plating solution pumped up from the bottom drain portion 501 by the pump P is supplied to the jet unit 170. The case (4) is an example of the plating device 63 having the dummy plate box 402 in which the dummy plate 410 is accommodated and configured to overflow the plating solution from the processing bath 110 to the dummy plate box 402. The plating solution pumped up from the dummy plate tank 402 by the pump P is supplied to the jet unit 170. The plating apparatus 60 according to the case (1) and the plating apparatus 63 according to the case (4) are arranged such that the plating liquid flow F is directed upward from below the processing bath 110, which is directly opposite to the traveling direction MD of the resin film 20 in the initial stage of the plating reaction. On the other hand, the plating apparatus 61 according to the case (2) and the plating apparatus 62 according to the case (3) have the same direction as the traveling direction MD of the resin film 20 in the initial stage of the plating reaction, with the plating liquid flow F directed downward from above the processing bath 110.

In addition, the plating solution was supplied from the high-level tank at a flow rate of 5L/min in any case, and the plating solution was discharged to the outside of the system at a flow rate of 5L/min, the discharge rate of the plating solution from the jet unit 170 was 13L/min, and the drain rates at the bottom drain portion 501 in the plating apparatus 61 according to the case (2) and the plating apparatus 62 according to the case (3) were 18L/min.

Fig. 5 shows an external view of the resin film 20 after the plating treatment in the upper part, and fig. 5 shows a partial enlarged view of TH (through hole) of the resin film 20 in the lower part. Further, in the partially enlarged view, the numerical values shown below the hole portions indicate the distances from TH to the non-deposited portions of the nickel plating produced around TH. As a result of the verification, as shown in the above external view, in the resin film 20 treated in the plating apparatus provided with the dummy board box 402 according to the cases (3) and (4), no remarkable nickel plating non-deposition portion was observed in the appearance of the resin film. This is considered to be because of the absence of the dummy plate (0.89 dm)²L) compared with the prior art, the load of the plating solution is increased to 1.58dm²Further, L, it was confirmed that, when the case (3) was compared with the case (4) (the lower partially enlarged view), the distance from TH to the non-deposited portion of the nickel plating non-deposited portion generated around TH was shorter in the case (3) and the non-deposited portion of nickel was small, and therefore, the plating liquid flow F of the activated plating liquid was rectified so as to be in the same direction as the traveling direction MD of the resin film 20, and the nickel deposition property was improved.

Fig. 6 is a diagram illustrating a first modification of the present embodiment. The plating apparatus 70 includes a volume vacancy member 25 ', and a slit 251 serving as a jet guide portion is formed in the volume vacancy member 25', and the slit 251 guides the jet plating fluid flow UF discharged from the jet unit 17 from above the processing bath 11 to the discharge side of the resin film 20. The slit 251 is formed in the volume vacancy member 25' to extend in the width direction of the resin film 20. In this way, since the slits 251 are formed at substantially the middle positions of the volume idling members 25', the jet plating liquid flow UF is guided to the discharge side of the resin film 20 as it goes upward of the processing bath 11, and thus a liquid flow in the same direction as the traveling direction MD of the resin film 20 can be formed.

Fig. 7 is a diagram illustrating a second modification of the present embodiment. The plating apparatus 80 is provided with an overflow tank 81 for storing a plating solution overflowing from the dummy cassette 40 on the upper end side of the processing tank 11. A drain pipe 83 is connected from the bottom of the overflow tank 81 to the storage tank 35. Therefore, even if the plating solution is supplied to the treatment bath 11 at any time or at all times, the plating solution does not flow out of the treatment bath 11 to the outside of the apparatus, and the plating solution flow F and the jet plating solution flow UF can be rectified to flow in the same direction as the traveling direction MD of the resin film 20.

Fig. 8 is a diagram illustrating a third modification of the present embodiment. The plating apparatus 90 is a plating apparatus (bath load: 2 dm) for applying the present modification to a resin film 20 having a width of 158mm²L, width of the processing bath 11: 140mm, width of the jet unit 17: 100mm), the plating apparatus 90 is provided with the variable wall plate 91 so that the distance S between the inner wall of the processing bath 11 and the jet unit 17 becomes variable, the distance S between the inner wall of the processing bath 11 and the jet unit 17 can be set to be 20mm to 70mm by adjusting the arrangement position of the variable wall plate 91, in this case, the distance (10mm to 35mm) between the jet unit 17 and the resin film 20 can be adjusted by changing the distance T between the auxiliary introduction roller 131 provided on the downstream side of the introduction roller 13 and the auxiliary discharge roller 151 provided on the upstream side of the discharge roller 15 in the conveying direction of the resin film 20, the narrowing of the interval between the inner wall of the processing bath 11 and the jet unit 17 is made narrower than the flow rate of the plating solution, the influence on the rise of the plating load is made larger, and the nickel precipitation can be improved, which has been verified by the inventors of the present invention that the plating apparatus 90 according to the third modification example can obtain the plating solution and the plating apparatus 80 according to the same modification as the first modification and the second modification of the plating apparatus 80.

In addition, the wet electroless nickel plating treatment applicable to the present invention may be performed to form a conductive nickel seed layer of about 10 to 300nm on both surfaces, and examples of the alloy of Ni include alloys such as Ni-B, Ni-Cu in addition to the above-mentioned Ni-P.

As described above, according to the present invention, it is possible to provide a wet processing apparatus for a resin film, which performs an electroless plating process on a strip-shaped resin film by a roll-to-roll continuous process, and which can promote the formation of a uniform metal coating by suppressing the detachment of a plating catalyst from the surface of the resin film and the abnormal adsorption of a stabilizer contained in a plating solution.