Process for reducing water ripples after heat treatment of copper foil

Abstract

The invention discloses a process for reducing water ripples after heat treatment of a copper foil, which relates to the technical field of electrolytic copper foils, and comprises the following steps: determining the winding length of the copper foil as A m according to order requirements, and determining the length of a polished thick foil as B m according to an online polishing standard operation flow; the cathode roller runs at the rotating speed of 6-12 m / min, the copper foil is wound for A m, and the winding tension is C N; after A m is reached, the rotating speed of the cathode roller is reduced to 1-3 m / minn, online polishing is started, B m polished thick foil continues to be wound on the A m copper foil, and the winding tension is D N; after A + B meters are reached, roll changing operation is started; and after reel changing is finished, the rotating speed of the cathode roller is increased to 6 m / min to 12 m / min, and winding work of the next reel of copper foil is directly started. According to the technology, by optimizing the foil generating technological process, the next roll of polished thick foil is wound on the outer ring of the previous roll of copper foil (namely A + B meters) to replace the outer layer of the previous roll of copper foil; and the step of removing the polished thick foil in the coil changing period is omitted, so that the waste of the foil is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic copper foils, and specifically to a process for reducing water ripples on copper foils after heat treatment. Background Art

[0002] The apparent texture on the surface of electrolytic copper foil similar to rippling water is called water ripple; water ripple is likely to cause problems such as wrinkling during the production process of downstream customers, affecting the use; therefore, when shipping as a supplier, the copper foil at the part with severe water ripple on the outer side of the finished foil will be peeled off and discarded to avoid customer complaints; this also causes problems of reduced copper foil production and increased production costs.

[0003] There is a heat treatment process from the raw copper foil to the slitting room, and its purpose is to reduce internal stress through heating and cooling, so that the copper foil can reach a stable state as soon as possible; in this process, the copper foil may produce microscopic deformation due to thermal expansion and contraction, resulting in water ripple defects; and because the copper foil is wound on the winding roll, the water ripple mainly appears at the position where it is heated the most during heating and dissipates heat the fastest during cooling, that is, the outermost layer of the copper foil.

[0004] In the current process on each raw copper foil machine, a roll of copper foil is produced according to the specified length requirement (assumed to be A meters), after A meters, it is wound and sent to the heat treatment process, and then the winding is changed, and then the cathode roll is polished online (assuming B meters of polished thick foil is produced), after B meters, all the polished thick foil is peeled off and discarded, and finally the production of the next roll of copper foil is carried out. After the copper foil roll is sent to the heat treatment process, water ripples are likely to appear on its outer layer; it is a waste to directly discard the polished thick foil. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a process for reducing water ripples on copper foils after heat treatment, and solves the problems raised in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A process for reducing water ripples on copper foils after heat treatment determines the winding length of the copper foil to be A meters according to the order requirements, and determines the length of the polished thick foil to be B meters according to the online polishing standard operation process;

[0007] Specifically, it includes the following steps:

[0008] Step 1: The copper foil is wound by the cathode roll, and the copper foil is wound for A meters, and the winding tension of the copper foil is x Newtons;

[0009] Step 2: When the wound copper foil reaches A meters, the rotation speed of the cathode roll is reduced, and then the online polishing operation is carried out, and B meters of polished thick foil is continuously wound on the A-meter copper foil, and the winding tension of the polished thick foil is y Newtons;

[0010] Step 3: When the length of the cathode roller winding reaches A + B meters, the roll change operation starts.

[0011] Step 4: Until the roll change is completed, increase the rotation speed of the cathode roller, and start the winding operation of the next roll of copper foil.

[0012] Step 5: Sequentially and repeatedly perform the operations of Step 1 to Step 4 in a cycle.

[0013] Optionally, the cathode roller in Step 1 runs at a rotation speed of 6 - 12 m / min.

[0014] Optionally, the rotation speed of the cathode roller in Step 2 drops to 1 - 3 m / min.

[0015] Optionally, the rotation speed of the cathode roller in Step 4 is increased to 6 - 12 m / min.

[0016] The present invention provides a process for reducing water ripples after heat treatment of copper foil, having the following beneficial effects:

[0017] This process for reducing water ripples after heat treatment of copper foil optimizes the raw foil process flow, winds the polished thick foil of the next roll on the outer circle of the copper foil of the previous roll (i.e., A + B meters), replacing the outer layer of the copper foil of the previous roll; therefore, after heat treatment, it is the polished thick foil that shows water ripples, rather than the outer layer of the copper foil; at the same time, the step of "discarding the polished thick foil" during roll change is omitted; thus, waste of foil material is reduced, production cost is lowered, and production efficiency is improved.

[0018] By optimizing the raw foil process flow, water ripple defects after heat treatment of copper foil are effectively reduced, and waste is decreased; at the same time, the roll change time of the raw foil is shortened. Specific Embodiments

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Embodiment 1: A process for reducing water ripples after heat treatment of copper foil determines the winding length of the copper foil as A meters according to the order requirements, and determines the length of the polished thick foil as B meters according to the online polishing standard operation process.

[0021] Specifically, it includes the following steps:

[0022] Step 1: Wind the copper foil through the cathode roller, winding A meters of the copper foil, where the winding tension of the copper foil is x Newtons.

[0023] Step 2: When the wound copper foil reaches A meters, reduce the rotation speed of the cathode roller, and then perform the online polishing operation, and continue to wind B meters of the polished thick foil on the A-meter copper foil, where the winding tension of the polished thick foil is y Newtons.

[0024] Step 3: When the length of the cathode roller winding reaches A + B meters, the roll change operation starts.

[0025] Step 4: Until the roll change is completed, increase the rotation speed of the cathode roller and start the winding operation of the next roll of copper foil.

[0026] Step 5: Sequentially and repeatedly perform the operations of Step 1 to Step 4 in a cycle.

[0027] In this embodiment, the cathode roller in Step 1 runs at a rotation speed of 6 - 12 m / min.

[0028] In this embodiment, the rotation speed of the cathode roller in Step 2 drops to 1 - 3 m / min.

[0029] In this embodiment, the rotation speed of the cathode roller in Step 4 is increased to 6 - 12 m / min.

[0030] Embodiment 2: A process for reducing water ripples after heat treatment of copper foil. Determine the copper foil winding length as 100 m according to the order requirements, and determine the polished thick foil length as 500 m according to the online polishing standard operation process.

[0031] Specifically, it includes the following steps:

[0032] Step 1: Wind the copper foil through the cathode roller. The cathode roller runs at a rotation speed of 8 m / min, and the copper foil is wound for 100 m, where the winding tension of the copper foil is 240 N.

[0033] Step 2: When the wound copper foil reaches 100 m, reduce the rotation speed of the cathode roller. The rotation speed of the cathode roller drops to 2 m / min, and then perform the online polishing operation. Continue to wind 500 m of polished thick foil on the 100 m copper foil, where the winding tension of the polished thick foil is 360 N.

[0034] Step 3: When the length of the cathode roller winding reaches 600 m, start the roll change operation.

[0035] Step 4: Until the roll change is completed, increase the rotation speed of the cathode roller. The rotation speed of the cathode roller is increased to 8 m / min, and start the winding operation of the next roll of copper foil.

[0036] Step 5: Sequentially and repeatedly perform the operations of Step 1 to Step 4 in a cycle.

[0037] Embodiment 3: A process for reducing water ripples after heat treatment of copper foil. Determine the copper foil winding length as 60 m according to the order requirements, and determine the polished thick foil length as 200 m according to the online polishing standard operation process.

[0038] Specifically, it includes the following steps:

[0039] Step 1: The copper foil is wound by the cathode roller. The cathode roller runs at a speed of 10 m / min, and 60 m of copper foil is wound. The winding tension of the copper foil is 248 N.

[0040] Step 2: After 60 m of copper foil is wound, the speed of the cathode roller is reduced. The speed of the cathode roller drops to 3 m / min, and then an on-line polishing operation is carried out. Then, 200 m of polished thick foil is wound on the 60 m copper foil. The winding tension of the polished thick foil is 316 N.

[0041] Step 3: When the length of the copper foil wound by the cathode roller reaches 260 m, the roll change operation starts.

[0042] Step 4: After the roll change is completed, the speed of the cathode roller is increased. The speed of the cathode roller is increased to 12 m / min, and the winding work of the next roll of copper foil starts.

[0043] Step 5: The operations of Step 1 to Step 4 are sequentially and repeatedly carried out in a cycle.

[0044] The present invention provides a technical solution: a process for reducing the water ripples of copper foil after heat treatment. Two raw foil machines are selected, and 10 rolls of copper foil blanks (8 μm, 10000 m) are continuously produced according to the raw foil processes before optimization (control group) and after optimization (experimental group) respectively; the length of the polished thick foil reaches 100 m; then, heat treatment is carried out at the same temperature and time, and the severely water-rippled part of the outer layer is peeled off at the end.

[0045] Control group: 720 m of the copper foil outer layer with water ripples are scrapped per roll on average, and 100 m of the polished thick foil is scrapped, with a total of 820 m scrapped; the roll change operation takes 0.60 h per roll on average.

[0046] Experimental group: The copper foil is processed by the above process method. 480 m of the copper foil outer layer with water ripples (including the polished waste foil) are scrapped per roll on average; the roll change operation takes 0.33 h per roll on average.

[0047] In comparison, the water ripples are reduced by 41%, and the time-consuming of the roll change operation is shortened by 45%.

[0048] Conclusion: By optimizing the raw foil process flow, the water ripple defects of the copper foil after heat treatment are effectively reduced, and the waste is reduced; at the same time, the roll change time of the raw foil is shortened, and the efficiency is improved.

[0049] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A process for reducing water ripples after heat treatment of copper foil, characterized in that: The copper foil reel length is determined to be A meters according to the order requirements, and the polished thick foil length is determined to be B meters according to the online polishing standard operating procedures; The specific steps include: Step 1: The copper foil is rolled up by the cathode roller, and the copper foil is rolled up by A meters, wherein the rolling tension of the copper foil is x Newtons; Step 2: When the rolled copper foil reaches A meters, the rotation speed of the cathode roller is reduced, and then the online polishing operation is performed, and B meters of polished thick foil is continued to be rolled on the A-meter copper foil, wherein the rolling tension of the polished thick foil is y Newtons; Step 3: When the cathode roller rewinding length reaches A+B meters, the reel changing operation starts; Step 4: After the roll change is completed, the speed of the cathode roller is increased, and the winding of the next roll of copper foil is started; Step 5: Repeat steps 1 to 4 in sequence.

2. A process for reducing water ripples after heat treatment of copper foil according to claim 1, characterized in that: The cathode roller in the step 1 runs at a rotation speed of 6 to 12 m / min.

3. The process for reducing water ripples after heat treatment of copper foil according to claim 1, characterized in that: In the step 2, the rotation speed of the cathode roller is reduced to 1-3 m / min.

4. The process for reducing water ripples after heat treatment of copper foil according to claim 1, characterized in that: In the step 4, the rotation speed of the cathode roller is increased to 6-12 m / min.