CN210065952U - Anti-wrinkling foil generation device - Google Patents
Anti-wrinkling foil generation device Download PDFInfo
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- CN210065952U CN210065952U CN201920571130.9U CN201920571130U CN210065952U CN 210065952 U CN210065952 U CN 210065952U CN 201920571130 U CN201920571130 U CN 201920571130U CN 210065952 U CN210065952 U CN 210065952U
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Abstract
The utility model provides a can prevent crude paper tinsel device of wrinkling, include: the device comprises an anode unit (10) electrically connected with a positive electrode, a cathode roller (20) electrically connected with a negative electrode, a cleaning unit (30), a conveying unit (40), a passivation tank (80) and a winding unit (60), wherein the cleaning unit (30), the conveying unit (40), the passivation tank (80) and the winding unit are arranged on one side of the cathode roller (20); the conveying unit (40) comprises a stripping roller (41), a first conveying roller (42), a second conveying roller (43) and a third conveying roller (44), wherein the diameters of the stripping roller and the first conveying roller are respectively more than or equal to 200mm and less than or equal to 300 mm; the peeling roller (41) is arranged at the top of the cleaning unit (30), the passivation tank (80) is arranged at one side of the peeling roller (41), the second conducting roller (43) is arranged in the passivation tank (80), and the first conducting roller (42) and the third conducting roller (44) are symmetrically arranged at the top of the passivation tank (80); the first transmission roller (42) adopts double pairs of bearings.
Description
Technical Field
The utility model relates to a can prevent crude paper tinsel device of wrinkling.
Background
At present, copper foil is an indispensable important basic material in the electronic industry, and particularly, as the new energy industry is further upgraded, the 6 μm or less electrolytic copper foil has wider market prospect, and the quality requirement on the 6 μm or less electrolytic copper foil is higher and higher. However, the conventional copper foil is easily wrinkled due to stress concentration by conduction of a small guide roller generally used in the production process, thereby affecting the yield.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can prevent crude paper tinsel device of wrinkling can effectively solve above-mentioned problem.
The utility model discloses a realize like this:
an anti-cockling green foil apparatus comprising: the device comprises an anode unit electrically connected with a positive electrode, a cathode roller electrically connected with a negative electrode, and a cleaning unit, a conveying unit, a passivation tank and a winding unit which are arranged on one side of the cathode roller; the conveying unit comprises a stripping roller, a first conveying roller, a second conveying roller and a third conveying roller, wherein the diameters of the stripping roller, the first conveying roller, the second conveying roller and the third conveying roller are all larger than or equal to 200mm and smaller than or equal to 300 mm; the peeling roller is arranged at the top of the cleaning unit, the passivation tank is arranged on one side of the peeling roller, the second conducting roller is arranged in the passivation tank, and the first conducting roller and the third conducting roller are symmetrically arranged at the top of the passivation tank; the first transmission roller adopts double pairs of bearings.
The utility model has the advantages that: the rapidly produced ultrathin copper foil is conducted by a large-roller-diameter conduction roller to be larger than 200mm, so that the stress of the foil surface can be dispersed, and the problem that the rapidly produced ultrathin copper foil is easy to wrinkle in the conduction process is effectively solved. Meanwhile, the design of double pairs of bearings is adopted on a single transmission roller, so that the resistance of the transmission roller is reduced as much as possible, smaller tension can be adopted to drive transmission, and the problem that the rapidly produced ultrathin copper foil is easy to wrinkle in the transmission process is further effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a foil generation device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a part of an anode unit in a foil generating device according to an embodiment of the present invention.
Fig. 3 is a schematic view of a part of the structure of a cathode roller in a foil generating device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a part of a cleaning unit in a foil generating device according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a part of a conveying unit in a foil generating device according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a drying and cooling unit in a green foil device according to an embodiment of the present invention.
FIG. 7 is a flow chart of a method for manufacturing an electrodeposited copper foil according to an embodiment of the present invention.
FIG. 8 is a scanning electron micrograph of a bright surface in an electrodeposited copper foil according to an embodiment of the present invention.
FIG. 9 is a scanning electron micrograph of a matte surface of an electrodeposited copper foil according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, an embodiment of the present invention provides a foil generating apparatus 100, including: the device comprises an anode unit 10, a cathode roller 20, a cleaning unit 30, a conveying unit 40, a drying and cooling unit 50, a winding unit 60 and a passivation tank 80, wherein the cleaning unit 30, the conveying unit 40, the drying and cooling unit 50, the winding unit 60 and the passivation tank are arranged on one side of the cathode roller 20. The anode unit 10 is connected with the positive pole of a direct current power supply, and the cathode roller 20 is connected with the negative pole of the direct current power supply.
Referring to fig. 2, the anode unit 10 includes two arc-shaped anode slots 11 coaxially disposed and a plurality of anode plates 12 disposed on the arc-shaped anode slots 11. The bottom between the two arc anode slots 11 is arranged at intervals, so that a liquid inlet 13 is formed. The anode plates 12 are sequentially spliced on the surface of the arc-shaped anode groove 11 from two sides of the liquid inlet 13 to the upper ends of two sides of the arc-shaped anode groove 11 in the radial direction respectively. The top of the arc anode groove 11 is provided with a liquid drainage channel 112.
The liquid inlet 13 comprises a plurality of shunting guide plates 14 arranged at intervals, and the shunting guide plates 14 are arranged between the two arc-shaped anode slots 11 in the vertical direction, so that the liquid inlet 13 is divided into a plurality of liquid inlet shunting guide channels. Each liquid inlet split flow guide channel is provided with a valve (not shown in the figure) respectively, so that the flow of each liquid inlet split flow guide channel can be controlled. And then the flow of the respective liquid inlet shunting guide channels is controlled, so that the fine control of the whole surface density of the rapidly produced ultrathin copper foil 70 is realized, the transverse uniformity of the copper foil 70 is improved, and the soft wrinkles and the seersucker are reduced. Preferably, the device comprises 10 to 20 flow dividing guide plates 14 arranged at intervals. In this embodiment, the liquid inlet 13 is divided into 16 uniform inlet liquid diversion guide channels by 15 diversion guide plates 14 arranged at intervals. As a further improvement, the drainage channels 112 are embedded in the arc-shaped anode grooves 11. More specifically, the inlet of the drainage channel 112 is arranged at the upper end of the intrados of the arc anode slot 11 and above the topmost anode plate 12; the outlet of the liquid drainage channel 112 is arranged outside the outer arc surface of the arc anode groove 11 and is opened downwards.
As a further improvement, the guiding flow distribution plate 14 is of a rectangular parallelepiped structure and is respectively connected with the arc anode slots 11 on both sides.
As a further improvement, the bottom surface of the anode plate 12 is an arc surface attached to the inner arc surface of the arc anode slot 11, and the adjacent anode plates 12 are attached and connected through side planes.
As a further improvement, a conductive interface (not shown in the figure) is disposed on the lower surface of each anode plate 12, and each anode plate 12 is connected to an independent dc power supply respectively and adjusts the input current by the respective independent dc power supply.
As a further improvement, conductive through holes (not shown) are respectively arranged on the arc-shaped anode slots 11 at positions corresponding to the conductive interfaces.
Referring to fig. 3, the cathode roll 20 includes a roll surface 21 for raw foil and side portions 22 disposed at two sides of the roll surface 21; the surface roughness of the roll surface 21 satisfies: ra <0.2mm, Rz <1.5 mm; the edge 22 is formed by hydrogen peroxide oxidation. By finely grinding the roll surface 21, pinholes in the surface of the ultra-thin copper foil 70 produced rapidly can be effectively eliminated. In addition, the processing of the side portion 22 is also advantageous to solve the problem that the ultra-thin copper foil 70, which is produced at a high speed, is easily broken during the peeling process.
As a further improvement, the width of the side part 22 is preferably 20-30 mm. In one embodiment, the width of the lip 22 is about 25 mm. The cathode roll 20 is a titanium roll.
The cathode roll 20 may be prepared by:
s1, dividing the surface of the cathode roll 20 into a roll surface 21 of green foil and side portions 22 provided on both sides of the roll surface 21;
s2, grinding the roll surface 21 with a grinding wheel so that the roughness of the roll surface 21 satisfies: ra <0.2mm, Rz <1.5 mm;
and S3, oxidizing the edge 22 by using hydrogen peroxide.
As a further improvement, in step S2, the roll surface 21 is ground with grinding wheels of 80#, 120#, 220#, 320#, 400#, 600# and 800# in order to make the roughness of the roll surface 21 satisfy: ra <0.2mm, Rz <1.5 mm.
As a further improvement, in step S3, the step of oxidizing the side 22 with hydrogen peroxide includes:
the edge 22 is wiped and wetted with hydrogen peroxide.
Referring to fig. 4, the cleaning unit 30 includes a collecting plate 31, a flexible water receiving plate 32 disposed on the collecting plate 31, a spray pipe 33, and a plurality of spray heads 34 disposed on the spray pipe 33 side by side; the flow rate of each nozzle 34 is 20-30L/H, and the pressure is 0.25-0.30 MPa. In the process of rapidly manufacturing the ultra-thin copper foil 70, since the speed is too fast and the cleaning time is short, it is necessary to increase the amount of water for cleaning and to ensure that a large amount of cleaning water cannot flow into the electrolyte.
As a further improvement, the flexible water receiving plate 32 is a PVC soft plate, and the thickness of the PVC soft plate is 0.1-0.5 mm. In one embodiment, the thickness of the PVC flexible sheet is 0.3mm, so that the concentration of the solution is ensured not to be diluted under the condition that the foil surface is not scratched, and the problem of cleaning the surface of the rapidly produced ultrathin copper foil 70 is effectively solved.
As a further improvement, the cleaning unit 30 comprises 10-20 spray heads 34 arranged on the spray pipe 33 side by side. Preferably, the cleaning unit 30 comprises 14 to 16 spray heads 34 arranged on the spray pipe 33 side by side. In one embodiment, the cleaning unit 30 includes 15 spray heads 34 arranged side by side on the spray pipe 33, and two adjacent spray heads 34 are arranged in a crossing manner.
As a further improvement, the cleaning unit 30 may further include a wringing glue roller 35 disposed at the top of the spray head 34 and tangent to the cathode roller 20 to squeeze the moisture remaining on the copper foil 70.
The transfer unit 40 includes a peeling roller 41, a first transfer roller 42, a second transfer roller 43, and a third transfer roller 44, each having a diameter of 200mm or more and 300mm or less. The peeling roller 41 is disposed at the top of the cleaning unit 30, the passivation tank 80 is disposed at one side of the peeling roller 41, the second conductive roller 43 is disposed in the passivation tank 80, and the first conductive roller 42 and the third conductive roller 44 are symmetrically disposed at the top of the passivation tank 80; the first transfer roller 42 employs a double pair of bearings.
In one embodiment, each guide roller 42/43/44 has a diameter of about 250 mm. The rapidly produced ultrathin copper foil 70 is conducted by a large-roll-diameter conducting roller for more than 200mm, so that the stress of the foil surface can be dispersed, and the problem that the rapidly produced ultrathin copper foil 70 is easy to wrinkle in the conducting process is effectively solved. Meanwhile, the design of double pairs of bearings is adopted on a single transmission roller, so that the resistance of the transmission roller is reduced as much as possible, and the transmission can be driven by adopting smaller tension, thereby further effectively solving the problem that the rapidly produced ultrathin copper foil 70 is easy to wrinkle in the transmission process.
As a further improvement, the conveying unit 40 may employ closed-loop control to make the tension fluctuation of the copper foil 70 less than 0.3KG, so that bubble sand generated by the tension fluctuation may be effectively solved.
Referring to fig. 5, as a further improvement, the first transmission roller 42 includes a transmission roller main body 420, a first bearing 421, a rotation shaft 422, a second bearing 423 and a support seat 424; the first bearing 421 is sleeved between the conductive roller body 420 and the rotating shaft 422; both ends of the first bearing 421 are disposed on the supporting seat 424 through the second bearing 423.
The winding unit 60 comprises a winding roller 62 with the diameter of 250-350 mm, and the winding tension of the winding roller is controlled to be 12-14 kg. As a further modification, the winding unit 60 further includes a lower pressure roller 63 disposed below the winding roller 62. The utility model discloses diameter 250 ~ 350 mm's wind-up roll is used in the rolling of ultra-thin copper foil 70 of quick production, and rolling tension control is between 12-14, and simultaneously based on the meticulous control of ultra-thin copper foil 70 surface density, use below adding the compression roller 63 in the rolling simultaneously, make the rolling of ultra-thin copper foil 70 of quick production more level and smooth closely knit no soft line, terminal surface uniformity when guaranteeing to receive the length book.
As a further improvement, the winding unit 60 further includes a fourth transmission roller 61 disposed on a side of the third transmission roller 44 far away from the first transmission roller 42, and the fourth transmission roller 61, the third transmission roller 44 and the first transmission roller 42 are disposed side by side. The wind-up roll 62 is disposed at a lower end of the fourth transfer roller 61 on a side away from the first transfer roller 42.
Referring to fig. 6, the drying and cooling unit 50 is disposed between the passivation tank 80 and the winding unit 60; the drying and cooling unit 50 includes a drying unit 51 disposed adjacent to the transfer unit 40, and a cooling unit 52 disposed adjacent to the winding unit 60; the drying unit 51 comprises an upper hot air knife 512 and a lower hot air knife 514 which are symmetrically arranged, and a hot air pipeline 516 connected with the upper hot air knife 512 and the lower hot air knife 514; cooling unit 52 includes the symmetry setting go up cold wind sword 522 and cold wind sword 524 down, and connect in go up cold wind sword 522 and cold wind pipeline 526 of cold wind sword 524 down. The utility model discloses the 70 foil sides of ultra-thin copper foil of quick production are dried and are adopted two-sided air knife, and the front bank uses the hot-blast quick blew out of high temperature, and the back bank uses cold wind evenly to blow out fast, guarantees that fastest speed is dried and the cooling.
As a further improvement, the flow rate of the drying unit 51 is 400m3H, and the temperature is 90-100 ℃. The flow rate of the cooling unit 52 was 210m3H, and the temperature is 20-27 ℃.
Referring to fig. 7, the present invention further provides a method for manufacturing an electrolytic copper foil, comprising the following steps:
s4, preparing a copper sulfate electrolyte: heating and dissolving high-purity copper wires with the purity of 99.95 percent or more in a sulfuric acid solution to generate a copper sulfate electrolyte;
s5, manufacturing a raw foil; adding an additive into the copper sulfate electrolyte, and conveying the copper sulfate electrolyte into an electrolytic tank of a foil forming machine for electrolytic foil forming, wherein the copper sulfate electrolyte is used for electrolytic foil forming; the technological parameters of the electrolytic green foil are as follows: the temperature of the electrolyte is controlled to be 50-60 ℃, and the current density of the anode plate 12 in the foil generation process is 38-45A/dm2，Cu2+The concentration is 90-95 g/L, H2SO4The concentration is 100-110 g/L, the gelatin concentration is 100-300ppm, the concentration of ceric sulfate is 0.5-10 ppm, the concentration of MESS is 1-20 ppm, the concentration of SPS is 10-50 ppm, Cl-The concentration is 10-30 ppm;
s6, anti-oxidation treatment: carrying out anti-oxidation treatment on the copper foil obtained by electrolysis;
s7, slitting the product: and cutting, cutting and packaging the copper foil subjected to the anti-oxidation treatment.
In step S5, preferably, Cu2+The concentration is 92-95 g/L, H2SO4The concentration is 105-108 g/L, and the temperature of the electrolyte is controlled at 55-60 ℃. The gelatin concentration is 150-250ppm, the ceric sulfate concentration is 2-5 ppm, and the MESS concentration is 10-15 ppm. The concentration of the SPS is 20-30 ppm, and Cl is-The concentration is 25-30 ppm. The combination of the aqueous solution A containing ceric sulfate and MESS can be adsorbed near the surface of the electrode, thereby effectively improving the quality of the electrodeCathode polarization, grain refinement and coating grain size change, thereby improving coating hardness; containing SPS and Cl-The combination of the aqueous solution B can remarkably improve the brightness of the plating layer.
In step S6, the step of subjecting the copper foil obtained by electrolysis to oxidation prevention treatment includes:
s61, passivating the copper foil obtained by electrolysis in a CrO3+ T (chromium trioxide + glucose) solution, wherein the passivation parameters are as follows: controlling pH at 3-3.5, temperature at 20-40 deg.C, and passivation current at 1-3A/dm2. Because the production speed of the 4-6 micron ultrathin copper foil is high and the time for passing through the passivation tank 80 is shortened, the previously used 8-12 micron preparation method cannot meet the production requirements of the 4-6 micron electrolytic copper foil, so that the electrolytic copper foil is ineffective in oxidation resistance. The utility model discloses the configuration technology of CrO3+ T is used at present, PH is controlled at 3-3.5, temperature control is at 20-40 ℃, passivation current control is at 1-3A to can effectively solve the emergence of the abnormal conditions such as anti-oxidant inefficacy.
In step S61, it is preferable that the passivation parameter is: the temperature is controlled at 25-30 ℃, and the passivation current is controlled at 2A/dm2。
Referring to fig. 8-9, the present invention further provides an electrodeposited copper foil obtained by the above method, which has a thickness of 4-6 μm, a tensile strength of 600-560 MPa at normal temperature, a tensile strength of 350-400 MPa after heating at 150 ℃ for 15 minutes, and an elongation of 3.5-10% at normal temperature and after heating at 150 ℃ for 15 minutes; and the warpage of the high-strength electrolytic copper foil is less than or equal to 5 mm. The high-strength electrolytic copper foil is warped by placing a copper foil sample with the length and the width larger than 15cm on pearl cotton with the bright surface facing upwards; then, placing the disc sampler on a copper foil sample; pressing down a handle and clockwise rotating for 180 degrees to cut into a circular sample; and (3) turning the round sample to enable the rough surface to face upwards by using a steel ruler, and finally measuring the warping of the edge part 22 of the round sample by using the steel ruler.
As a further improvement, the glossiness of the rough surface of the high-strength electrolytic copper foil is 130-250 Gu.
As a further improvement, the gloss of the bright surface of the high-strength electrolytic copper foil is 60-100 Gu.
As a further improvement, the high-strength electrolytic copper foil has a uniform areal density of 30 to 60 g/m.
The utility model also provides a lithium ion secondary battery current collector and lithium ion secondary battery of using above-mentioned high strength electrolytic copper foil.
In addition, the utility model also provides an electromagnetic shielding material who uses above-mentioned high strength electrolytic copper foil preparation to form.
Example (b): heating and dissolving a high-purity copper wire with the purity of 99.95% in a sulfuric acid solution to generate a copper sulfate electrolyte; adding an additive into the copper sulfate electrolyte, and conveying the copper sulfate electrolyte into an electrolytic tank of a foil forming machine for electrolytic foil forming, wherein the copper sulfate electrolyte is used for electrolytic foil forming; the technological parameters of the electrolytic green foil are as follows: the temperature of the electrolyte is controlled at 58 ℃, and Cu2+The concentration is 94g/L, H2SO4106g/L of gelatin, 150ppm of gelatin, 4ppm of ceric sulfate, 12ppm of MESS, 25ppm of SPS, and Cl-The concentration is 28 ppm; the copper foils with the diameters of 4 microns, 4.5 microns, 5 microns and 6 microns are respectively obtained by controlling the current density of the anode plate in the foil generation process. The test data for various copper foils were as follows:
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An anti-wrinkling green foil device, comprising: the device comprises an anode unit (10) electrically connected with a positive electrode, a cathode roller (20) electrically connected with a negative electrode, a cleaning unit (30), a conveying unit (40), a passivation tank (80) and a winding unit (60), wherein the cleaning unit (30), the conveying unit (40), the passivation tank (80) and the winding unit are arranged on one side of the cathode roller (20); the conveying unit (40) comprises a stripping roller (41), a first conveying roller (42), a second conveying roller (43) and a third conveying roller (44), wherein the diameters of the stripping roller and the first conveying roller are respectively more than or equal to 200mm and less than or equal to 300 mm; the peeling roller (41) is arranged at the top of the cleaning unit (30), the passivation tank (80) is arranged at one side of the peeling roller (41), the second conducting roller (43) is arranged in the passivation tank (80), and the first conducting roller (42) and the third conducting roller (44) are symmetrically arranged at the top of the passivation tank (80); the first transmission roller (42) adopts double pairs of bearings.
2. The green foil arrangement as claimed in claim 1, wherein each transfer roll (42/43/44) has a diameter of 250 mm.
3. The green foil device as claimed in claim 1, wherein the first transfer roller (42) comprises a transfer roller body (420), a first bearing (421), a rotation shaft (422), a second bearing (423) and a support seat (424); the first bearing (421) is sleeved between the transmission roller main body (420) and the rotating shaft (422); two ends of the first bearing (421) are arranged on the supporting seat (424) through the second bearing (423).
4. The green foil device as claimed in claim 1, wherein the take-up unit (60) further comprises a lower pressure roller (63) arranged below the take-up roller (62).
5. The foil forming apparatus according to claim 4, wherein the winding unit (60) further comprises a fourth guide roller (61) disposed on a side of the third guide roller (44) remote from the first guide roller (42), and the fourth guide roller (61), the third guide roller (44) and the first guide roller (42) are disposed side by side.
6. The green foil installation as claimed in claim 5, characterized in that the wind-up roll (62) is arranged at the lower end of the fourth transfer roll (61) on the side remote from the first transfer roll (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920571130.9U CN210065952U (en) | 2019-04-24 | 2019-04-24 | Anti-wrinkling foil generation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920571130.9U CN210065952U (en) | 2019-04-24 | 2019-04-24 | Anti-wrinkling foil generation device |
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| CN210065952U true CN210065952U (en) | 2020-02-14 |
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| CN201920571130.9U Active CN210065952U (en) | 2019-04-24 | 2019-04-24 | Anti-wrinkling foil generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111394753A (en) * | 2020-03-30 | 2020-07-10 | 广东嘉元科技股份有限公司 | Method for producing electrolytic copper foil by anode tank, foil forming machine and electrolyte flowing |
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2019
- 2019-04-24 CN CN201920571130.9U patent/CN210065952U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111394753A (en) * | 2020-03-30 | 2020-07-10 | 广东嘉元科技股份有限公司 | Method for producing electrolytic copper foil by anode tank, foil forming machine and electrolyte flowing |
| CN111394753B (en) * | 2020-03-30 | 2020-12-08 | 广东嘉元科技股份有限公司 | Method for producing electrolytic copper foil by anode tank, foil forming machine and electrolyte flowing |
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