A copper foil passivation system

Abstract

The utility model relates to copper foil manufacturing equipment technical field provides a kind of copper foil passivation system, including the passivation pool and cleaning pool arranged before and after along the conveying direction of copper foil, passivation pool has first chamber;Cleaning pool has second chamber, and passivation pool is equipped with infiltration roller, coating roller and overflow port;Infiltration roller and coating roller are arranged before and after along the conveying direction of copper foil;Infiltration roller is arranged below overflow port and is immersed in the passivation liquid in first chamber, and coating roller is arranged above overflow port and is away from the passivation liquid in first chamber;Coating roller is at least a pair, including upper press roller and lower press roller, and upper press roller and lower press roller are arranged upside down;The lower half of upper press roller, lower press roller respectively contacts the upper end surface, lower end surface of copper foil.This passivation system can improve the uniformity of passivation liquid coating, so that the surface of copper foil can form continuous, uniform passivation film, effectively improve the oxidation resistance of copper foil.

Description

Technical Field

[0001] This utility model relates to the technical field of copper foil manufacturing equipment, specifically a copper foil passivation system. Background Technology

[0002] Copper foil passivation is a surface treatment process that forms a protective layer on the surface of copper foil to prevent oxidation, discoloration, or corrosion. It is particularly important in the electronics industry (such as PCB manufacturing), lithium battery current collectors, and architectural decoration.

[0003] Currently, the main process for copper foil passivation is degreasing → primary water washing → passivation → secondary water washing → drying and packaging. For example, CN222251007U discloses a copper foil surface grease cleaning line, including an unwinding device, a degreasing cleaning box, a drying device, and a rewinding device, as well as a plasma cleaning device. The drying device includes a drying mechanism I and a drying mechanism II. The unwinding device, the degreasing cleaning box, the drying mechanism I, the plasma cleaning device, the drying mechanism II, and the rewinding device are arranged sequentially according to the running direction of the cleaning line.

[0004] However, current passivation systems suffer from problems such as discontinuous and uneven passivation films, poor adhesion, and even no film formation at all, severely affecting the protective effect of the protective layer and the appearance of the copper foil. These issues can be caused by incomplete degreasing, excessively low passivation solution concentration, passivation solution aging, and uneven passivation solution coating.

[0005] Based on this, the technical problem to be solved in this case is: how to solve the problems of discontinuous, uneven, poorly bonded, or even non-existent passivation films. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this utility model provides a copper foil passivation system. This passivation system can improve the uniformity of passivation liquid coating, thereby enabling the formation of a continuous and uniform passivation film on the surface of the copper foil, effectively improving the oxidation resistance of the copper foil.

[0007] The technical solution of this utility model is:

[0008] A copper foil passivation system includes a passivation tank and a cleaning tank arranged back-to-back along the copper foil conveying direction. The passivation tank has a first chamber for containing passivation liquid; the cleaning tank has a second chamber for containing cleaning water. The passivation tank is provided with an immersion roller, a coating roller, and an overflow port. The immersion roller and the coating roller are arranged back-to-back along the copper foil conveying direction. The immersion roller is located below the overflow port and immersed in the passivation liquid in the first chamber, and the coating roller is located above the overflow port and away from the passivation liquid in the first chamber. The coating roller is at least a pair, including an upper pressure roller and a lower pressure roller, which are arranged vertically. The lower half of the upper pressure roller contacts the upper end face of the copper foil, and the upper half of the lower pressure roller contacts the lower end face of the copper foil.

[0009] In the copper foil passivation system described above, there are multiple impregnation rollers, the lower half of which contacts the upper surface of the copper foil. The multiple impregnation rollers are arranged side by side with spacing along the copper foil conveying direction to ensure that the copper foil is conveyed horizontally.

[0010] In the copper foil passivation system described above, a tensioning roller is also provided in the passivation tank; the immersion roller, the tensioning roller, and the coating roller are arranged back and forth along the copper foil conveying direction; the tensioning roller is located above the overflow port and away from the passivation liquid in the first chamber; the upper half of the tensioning roller is in contact with the lower end face of the copper foil, and the tensioning roller and the pressure roller are arranged side by side with a spacing to ensure that the copper foil is conveyed horizontally.

[0011] In the copper foil passivation system described above, the passivation tank is further provided with an inlet and an outlet; both the inlet and the outlet are located at the bottom of the first chamber.

[0012] In the copper foil passivation system described above, a baffle is provided in the passivation pool; the passivation pool and the baffle form an overflow cavity; the overflow cavity has one and only its upper end face connected to the first chamber; and the overflow port is located in the overflow cavity.

[0013] In the copper foil passivation system described above, both the upper and lower pressure rollers have a flexible layer on their outer periphery.

[0014] In the copper foil passivation system described above, the cleaning tank is provided with a first guide roller, a washing roller, and a second guide roller arranged back and forth along the copper foil conveying direction; the first guide roller and the second guide roller are away from the clean water in the second chamber; the washing roller is immersed in the clean water in the second chamber.

[0015] In the copper foil passivation system described above, the upper half of the first guide roller contacts the lower end face of the copper foil; there are multiple washing rollers arranged side by side with spacing to allow the copper foil to be transported horizontally; the lower half of the washing roller contacts the upper end face of the copper foil; and the upper half of the second guide roller contacts the lower end face of the copper foil.

[0016] In the copper foil passivation system described above, the cleaning tank is provided with an inlet and an outlet; both the inlet and the outlet are located at the bottom of the first chamber.

[0017] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0018] This invention uses a wetting roller in a passivation tank to completely immerse the copper foil in the passivation solution, ensuring that the passivation solution adheres to all parts of the copper foil. Simultaneously, the wetting roller and coating roller are arranged back-to-back along the copper foil's conveying direction in the first chamber of the passivation tank, with the coating roller and wetting roller arranged vertically. This allows the copper foil to continue being conveyed at an upward angle after being immersed in the passivation solution, causing excess passivation solution to fall back into the passivation solution layer in the first chamber, effectively reducing the amount of passivation solution lost. Then, the copper foil, after immersion, immediately passes through the coating roller, which contacts and presses the surface of the copper foil. The upper pressure roller contacts the upper end face of the copper foil, and the lower pressure roller contacts the lower end face. Compared to traditional methods, the coating roller prevents the passivation solution adhering to the copper foil surface from accumulating into droplets and sliding off during subsequent processes (washing, drying). This avoids the film layer in the sliding area becoming too thin and discontinuous, while the passivation solution accumulates in the droplet retention area, forming an excessively thick and loose film layer. Attached Figure Description

[0019] Figure 1 This is a top view of Embodiment 1 of the present invention;

[0020] Figure 2 This is a side view of Embodiment 1 of the present invention.

[0021] The correspondence between the labels in the diagram is as follows:

[0022] Passivation tank 1; first chamber 1a; overflow port 101; liquid inlet 102; liquid outlet 103; wetting roller 11; coating roller 12; upper pressure roller 121; lower pressure roller 122; tension roller 13; partition plate 14; overflow chamber 14a; cleaning tank 2; second chamber 2a; water inlet 201; water outlet 202; first guide roller 21; washing roller 22; second guide roller 23; copper foil A. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] refer to Figure 1 , 2 A copper foil passivation system includes a passivation tank 1 and a cleaning tank 2 arranged back-to-back along the conveying direction of copper foil A. The passivation tank 1 has a first chamber 1a for containing passivation liquid; the cleaning tank 2 has a second chamber 2a for containing cleaning water. The passivation tank 1 is provided with an immersion roller 11, a coating roller 12, and an overflow port 101. The immersion roller 11 and the coating roller 12 are arranged back-to-back along the conveying direction of copper foil A. The immersion roller 11 is disposed at the overflow port 101. The coating roller 12 is positioned above the overflow port 101 and away from the passivation liquid in the first chamber 1a. The coating roller 12 is at least a pair, including an upper pressure roller 121 and a lower pressure roller 122, which are arranged vertically. The lower half of the upper pressure roller 121 contacts the upper end face of the copper foil A, and the upper half of the lower pressure roller 122 contacts the lower end face of the copper foil A.

[0026] In practical applications, copper foil A is first completely immersed in the passivation liquid in the first chamber 1a by the immersion roller 11, and then it is separated and enters the working area of ​​the coating roller 12. The upper pressure roller 121 contacts the upper end face of copper foil A, and the lower pressure roller 122 contacts the lower end face of copper foil A, and scrapes the passivation liquid to form a continuous and uniform passivation liquid layer, thereby generating a continuous and uniform film layer.

[0027] It should be noted that this embodiment does not mention the conveying mechanism that drives the copper foil, although the conveying mechanism is actually part of the copper foil production line.

[0028] The advantage of this embodiment is that the copper foil A is completely immersed in the passivation solution by the wetting roller 11 in the passivation tank 1, so that the passivation solution can be adhered to all parts of the copper foil A. At the same time, the wetting roller 11 and the coating roller 12 are arranged back and forth along the conveying direction of the copper foil A in the first chamber 1a of the passivation tank 1, and the coating roller 12 and the wetting roller 11 are arranged vertically. This allows the copper foil A to continue to be conveyed at an upward angle after being immersed in the passivation solution, so that the excess passivation solution falls back into the passivation solution layer in the first chamber 1a, effectively reducing the loss of the passivation solution. The copper foil A, after being impregnated, immediately passes through the coating roller 12. The coating roller 12 contacts and presses the surface of the copper foil A. The upper pressure roller 121 contacts the upper end face of the copper foil A, and the lower pressure roller 122 contacts the lower end face of the copper foil A. Compared with the traditional method, the coating roller 12 can prevent the passivation liquid adhering to the surface of the copper foil A in subsequent processes (washing, drying) from accumulating into droplets and sliding off, which would result in the film layer in the sliding area being too thin and discontinuous, while the passivation liquid in the droplet retention area would accumulate, forming an excessively thick and loose film layer.

[0029] In this embodiment, specifically, there are two impregnation rollers 11. The lower half of each impregnation roller 11 contacts the upper surface of the copper foil A. Along the conveying direction of the copper foil A, the two impregnation rollers 11 are arranged side by side with a spacing between them so that the copper foil A is conveyed horizontally. Under the above design, the copper foil A is conveyed horizontally to the ground between the two impregnation rollers 11. In actual operation, the distance between the two impregnation rollers 11 can be adjusted according to the actual situation to extend or shorten the impregnation time.

[0030] In this embodiment, the passivation tank 1 is further provided with a tension roller 13; the immersion roller 11, the tension roller 13 and the coating roller 12 are arranged back and forth along the conveying direction of the copper foil A; the tension roller 13 is located above the overflow port 101 and away from the passivation liquid in the first chamber 1a; the upper half of the tension roller 13 is in contact with the lower end face of the copper foil A, and the tension roller 13 and the pressure roller 122 are arranged side by side with a spacing to make the copper foil A conveyed horizontally. In the above design, the tension roller 13 acts as a transition, allowing the wetted copper foil A to be conveyed at an upward angle to the tension roller 13, and then from the tension roller 13 into the upper pressure roller 121 and the lower pressure roller 122. The section from the tension roller 13 to the coating roller 12 is horizontal to the ground, thus keeping the copper foil A horizontal as it enters the upper pressure roller 121 and the lower pressure roller 122, effectively improving the consistency of the compression degree on the upper and lower surfaces of the copper foil A.

[0031] In practical applications, the passivation tank 1 is further provided with an inlet 102 and an outlet 103; both the inlet 102 and the outlet 103 are located at the bottom of the first chamber 1a. With the above design, combined with the overflow port 101, this embodiment can continuously supply new passivation solution to the passivation tank 1 through an external circulation system, while the old passivation solution is returned to the external circulation system through the overflow port 101 for further processing. Thus, this embodiment can maintain the concentration of the passivation solution, avoiding the continuous dilution of the passivation solution concentration by residual water on the copper foil A during the front-end cleaning process, which could cause passivation layer defects. Furthermore, the outlet 103 is generally used for periodic maintenance cleaning of the entire machine to discharge the passivation solution. It should be noted that this embodiment does not further describe the piping of the external circulation system; those skilled in the art should be aware of the scope of protection of this embodiment regarding existing piping connections, the selection of circulation pumps, and the design of corresponding conventional parameters.

[0032] In this embodiment, specifically, the passivation tank 1 is provided with a baffle 14; the passivation tank 1 and the baffle 14 form an overflow cavity 14a; the overflow cavity 14a has its upper end face connected to the first chamber 1a; and the overflow port 101 is disposed in the overflow cavity 14a. Under the above design, the passivation liquid enters the overflow port 101 from the overflow cavity 14a, and the overflow cavity 14a serves to temporarily store the passivation liquid.

[0033] In practical applications, to improve the reliability of extrusion, both the upper pressure roller 121 and the lower pressure roller 122 are provided with a flexible layer (not shown in the figure) on their outer periphery. It should be noted that the material of the flexible layer is insoluble in the passivation liquid and does not react with the passivation liquid, such as perfluoroether rubber, modified fluororubber, etc.

[0034] In this embodiment, specifically, the cleaning tank 2 is provided with a first guide roller 21, a water washing roller 22 and a second guide roller 23 arranged back and forth along the conveying direction of the copper foil A; the first guide roller 21 and the second guide roller 23 are away from the clean water in the second chamber 2a; the water washing roller 22 is immersed in the clean water in the second chamber 2a.

[0035] In this embodiment, more specifically, the upper half of the first guide roller 21 contacts the lower end face of the copper foil A; two washing rollers 22 are arranged side-by-side with a spacing to allow the copper foil A to be conveyed horizontally; the lower half of the washing roller 22 contacts the upper end face of the copper foil A; and the upper half of the second guide roller 23 contacts the lower end face of the copper foil A. In other embodiments, an air knife can be added to the second guide roller 23 to remove some of the residual cleaning water on the copper foil, thereby reducing the amount of water required for subsequent drying processes.

[0036] Under the above design, after copper foil A is immersed in and uniformly passivated by coating roller 12, the excess adhering passivation liquid is rinsed away by the cleaning water in the second chamber 2a, so as to avoid the residual liquid adsorbing impurities in the air and reacting to form stains that are difficult to remove.

[0037] To quickly flush away the passivation solution, the cleaning tank 2 is equipped with an inlet 201 and an outlet 202; both the inlet 201 and the outlet 202 are located at the bottom of the first chamber 1a. Similarly, both the inlet 201 and the outlet 202 are connected to an external circulating water system to continuously circulate the clean water in the second chamber 2a.

[0038] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A copper foil passivation system, comprising a passivation tank and a cleaning tank arranged back-to-back along the conveying direction of the copper foil, the passivation tank having a first chamber for containing a passivation solution; the cleaning tank having a second chamber for containing cleaning water, characterized in that, The passivation tank is equipped with an immersion roller, a coating roller, and an overflow port; the immersion roller and the coating roller are arranged back and forth along the conveying direction of the copper foil; the immersion roller is located below the overflow port and immersed in the passivation liquid in the first chamber, and the coating roller is located above the overflow port and away from the passivation liquid in the first chamber; the coating roller is at least a pair, including an upper pressure roller and a lower pressure roller, which are arranged vertically; the lower half of the upper pressure roller contacts the upper end face of the copper foil, and the upper half of the lower pressure roller contacts the lower end face of the copper foil.

2. The copper foil passivation system according to claim 1, characterized in that, There are multiple impregnation rollers, the lower half of which contacts the upper surface of the copper foil. The multiple impregnation rollers are arranged side by side with spacing along the copper foil conveying direction to ensure that the copper foil is conveyed horizontally.

3. The copper foil passivation system according to claim 1, characterized in that, The passivation tank is also equipped with a tension roller; the immersion roller, the tension roller and the coating roller are arranged back and forth along the conveying direction of the copper foil; the tension roller is located above the overflow port and away from the passivation liquid in the first chamber; the upper half of the tension roller is in contact with the lower end face of the copper foil, and the tension roller and the pressure roller are arranged side by side with a spacing to ensure that the copper foil is conveyed horizontally.

4. The copper foil passivation system according to claim 1, characterized in that, The passivation tank is also provided with an inlet and an outlet; both the inlet and the outlet are located at the bottom of the first chamber.

5. The copper foil passivation system according to claim 1, characterized in that, The passivation tank is provided with a baffle; the passivation tank and the baffle form an overflow cavity; the overflow cavity is connected to the first chamber only on its upper end face; the overflow port is located in the overflow cavity.

6. The copper foil passivation system according to claim 1, characterized in that, Both the upper and lower pressure rollers have a flexible layer on their outer periphery.

7. The copper foil passivation system according to claim 1, characterized in that, The cleaning tank is equipped with a first guide roller, a washing roller, and a second guide roller arranged back and forth along the conveying direction of the copper foil; the first guide roller and the second guide roller are away from the clean water in the second chamber; the washing roller is immersed in the clean water in the second chamber.

8. The copper foil passivation system according to claim 7, characterized in that, The upper half of the first guide roller contacts the lower end face of the copper foil; there are multiple washing rollers arranged side by side with spacing to allow the copper foil to be conveyed horizontally; the lower half of the washing roller contacts the upper end face of the copper foil. The upper half of the second guide roller is in contact with the lower end face of the copper foil.

9. The copper foil passivation system according to claim 1, characterized in that, The cleaning tank is provided with an inlet and an outlet; both the inlet and the outlet are located at the bottom of the first chamber.

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