CN109943869A - Flash baking cools down foil device - Google Patents
Flash baking cools down foil device Download PDFInfo
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- CN109943869A CN109943869A CN201910335943.2A CN201910335943A CN109943869A CN 109943869 A CN109943869 A CN 109943869A CN 201910335943 A CN201910335943 A CN 201910335943A CN 109943869 A CN109943869 A CN 109943869A
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Abstract
The present invention provides a kind of cooling foil devices of flash baking, comprising: with the positive anode unit being electrically connected, the cathode roll being electrically connected with cathode and the transmission unit, Drying and cooling unit and rolling unit for being set to the cathode roll side；The Drying and cooling unit is set between the deactivation slot and the rolling unit；The Drying and cooling unit includes the drying unit close to transmission unit setting, and the cooling unit of close rolling unit setting；The drying unit includes symmetrically arranged upper hot wind knife and lower hot wind knife, and is connected to the hot air duct of the upper hot wind knife and the lower hot wind knife；The cooling unit includes symmetrically arranged upper cold knife and lower cold knife, and is connected to the cold air duct of the upper cold knife and the lower cold knife.
Description
Technical field
The present invention relates to a kind of cooling foil devices of flash baking.
Background technique
Currently, copper foil is the indispensable important foundation material of electronics industry, especially as the further of New Energy Industry
Upgrading, 6 μm and following electrolytic copper foil have broader market prospects, while to 6 μm and the quality requirement of following electrolytic copper foil
Also higher and higher.Traditional copper foil production drying adds fan quenching using resistance heating pipe, but this type of cooling without
Method flash baking 4-6 micron copper foil in a short time.
Summary of the invention
The present invention provides a kind of cooling foil devices of flash baking, can effectively solve the above problems.
The present invention is implemented as follows:
A kind of cooling foil device of flash baking, comprising: the anode unit being electrically connected with anode, the yin being electrically connected with cathode
Pole roller and the transmission unit, Drying and cooling unit and rolling unit for being set to the cathode roll side；The Drying and cooling
Unit is set between the deactivation slot and the rolling unit；The Drying and cooling unit includes close to the transmission unit
The drying unit of setting, and the cooling unit close to rolling unit setting；The drying unit includes symmetrically arranged
Upper hot wind knife and lower hot wind knife, and it is connected to the hot air duct of the upper hot wind knife and the lower hot wind knife；It is described cold
But unit includes symmetrically arranged upper cold knife and lower cold knife, and is connected to the upper cold knife and the lower cold wind
The cold air duct of knife；The flow velocity of the drying unit is 400m3/ h, and temperature is 90~100 DEG C；The cooling unit
Flow velocity is 210m3/ h, and temperature is 20~27 DEG C.
The beneficial effects of the present invention are: the extra thin copper foil foil face drying of invention quickly produced uses two-sided air knife, it is front-seat
It is uniformly quickly blown out using high-temperature hot-air, heel row is uniformly quickly blown out using cold wind, guarantees prestissimo drying and cooling.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is that the embodiment of the present invention provides the structural schematic diagram of foil device.
Fig. 2 is that the embodiment of the present invention provides the partial structure diagram of foil device middle-jiao yang, function of the spleen and stomach pole unit.
Fig. 3 is that the embodiment of the present invention provides the partial structure diagram of cathode roll in foil device.
Fig. 4 is that the embodiment of the present invention provides the partial structure diagram of cleaning unit in foil device.
Fig. 5 is that the embodiment of the present invention provides the partial structure diagram of transmission unit in foil device.
Fig. 6 is that the embodiment of the present invention provides the structural schematic diagram of Drying and cooling unit in foil device.
Fig. 7 is the preparation method flow chart of electrolytic copper foil provided in an embodiment of the present invention.
Fig. 8 is the stereoscan photograph in bright face in electrolytic copper foil provided in an embodiment of the present invention.
Fig. 9 is the stereoscan photograph of hair side in electrolytic copper foil provided in an embodiment of the present invention.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, term " first ", " second " are used for description purposes only, and should not be understood as instruction or dark
Show relative importance or implicitly indicates the quantity of indicated technical characteristic.The feature of " first ", " second " is defined as a result,
It can explicitly or implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two
It is a or more than two, unless otherwise specifically defined.
Referring to Fig.1 shown in, the embodiment of the present invention provides a kind of foil device 100, comprising: anode unit 10, cathode roll 20,
And be set to the cleaning unit 30 of 20 side of cathode roll, transmission unit 40, Drying and cooling unit 50, rolling unit 60 with
And deactivation slot 80.The anode unit 10 is connect with DC power anode, and the cathode roll 20 is connect with DC power cathode.
Referring to figure 2., the anode unit 10 includes two arc-shaped anode slots 11 of concentric setting and is set to
Muti-piece anode plate 12 on the arc-shaped anode slot 11.Bottom interval setting between described two arc-shaped anode slots 11,
To form inlet 13.The muti-piece anode plate 12 is along 13 two sides of inlet to arc-shaped 11 two sides of anode slot
Difference radial sequential concatenation in end is in the surface of the arc-shaped anode slot 11.The top of the arc-shaped anode slot 11 is provided with row
Liquid channel 112.
The inlet 13 includes multiple spaced shunting guide plates 14, and the shunting guide plate 14 is along the vertical direction
It is set between described two arc-shaped anode slots 11, leads to so that the inlet 13 is divided into multiple feed liquors and shunts guiding
Road.Each feed liquor shunts and is respectively arranged with valve (being not drawn into figure) on guide channel, shunts so as to control respective feed liquor
The uninterrupted of guide channel.And then the flow that guide channel is shunted by controlling respective feed liquor is played, to realize to fast fast-growing
The precise controlling of the whole surface density of the extra thin copper foil 70 of production, improves 70 horizontal homogeneity of copper foil, reduces soft wrinkle, the production of seersucker
It is raw.Preferably, the shunting guide plate 14 including the setting of 10~20 block gaps.In the present embodiment, point including the setting of 15 block gaps
Guide plate 14 is flowed, so that the inlet 13, which is separated into 16 uniform feed liquors, shunts guide channel.As further improvement
, the apocenosis passage 112 is embedded in the arc-shaped anode slot 11.More specifically, the entrance of the apocenosis passage 112 is set
Set in the arc-shaped 11 intrados upper end of anode slot and be arranged in the top of one piece of anode plate 12 of top；The apocenosis passage
112 outlet is arranged on the outside of the extrados of the arc-shaped anode slot 11 and Open Side Down.
As further improved, the guiding flow distribution plate 14 is rectangular parallelepiped structure, and is separately connected the arc-shaped of two sides
Anode slot 11.
As further improved, 12 bottom surface of anode plate is the arc being bonded with arc-shaped 11 intrados of anode slot
Shape face, and be fitted and connected between adjacent anode plate 12 by side plane.
As further improved, each piece of 12 lower surface of anode plate is provided with conductive interface (being not drawn into figure), each
Block anode plate 12 is separately connected an independent DC power supply and adjusts input current by respective independent DC power supply.
As further improved, corresponded on arc-shaped anode slot 11 conductive interface position be respectively arranged with it is conductive logical
Hole (is not drawn into) in figure.
Referring to figure 3., the cathode roll 20 includes the roll surface 21 for foil and is set to 21 two sides of roll surface
Edge 22；The surface roughness of the roll surface 21 meets: Ra < 0.2mm, Rz < 1.5mm；The edge 22 passes through hydrogen peroxide oxidation
Processing is formed.By carrying out fine gtinding to the roll surface 21, so as to effectively eliminate 70 table of extra thin copper foil quickly produced
The pin hole in face.In addition, being removed by the extra thin copper foil 70 that the processing to the edge 22 is also beneficial to solve quickly to produce
Problem easily broken in journey.
As further improved, the width of the edge 22 is preferably 20~30mm.Institute in one of the embodiments,
The width for stating edge 22 is about 25mm.The cathode roll 20 is titanium roller.
The cathode roll 20 can be prepared by the following method:
The surface of the cathode roll 20 is divided into the roll surface 21 of foil and is set to the side of 21 two sides of roll surface by S1
Portion 22；
S2 meets the roughness of the roll surface 21: Ra < 0.2mm, Rz < 1.5mm using abrasion wheel grinding roll surface 21；
S3 handles the edge 22 with hydrogen peroxide oxidation.
As further improved, in step s 2, successively with 80#, 120#, 220#, 320#, 400#, 600# and
The abrasion wheel grinding roll surface 21 of 800# meets the roughness of the roll surface 21: Ra < 0.2mm, Rz < 1.5mm.
As further improved, in step s3, described the step of handling edge 22 with hydrogen peroxide oxidation are as follows:
It is wiped by hydrogen peroxide and infiltrates the edge 22.
Referring to figure 4., the cleaning unit 30 includes collecting board 31, the flexible water-accepting board being set on the collecting board 31
32, it jet pipe 33 and is arranged side by side in multiple spray heads 34 on the jet pipe 33；The flow of each spray head 34 is 20~30L/H,
And 0.25~0.30Mpa of pressure.During quickly production extra thin copper foil 70, because of excessive velocities, scavenging period is very short, therefore
It needs to increase water cleaning, while also to guarantee that a large amount of ejected wash water cannot flow into electrolyte.
As further improved, the flexibility water-accepting board 32 is PVC soft board, and the PVC soft board with a thickness of 0.1~
0.5mm.In one of the embodiments, the PVC soft board with a thickness of 0.3mm so that the case where not scratching foil face
Lower guarantee solution concentration will not be diluted, and effectively solve the problems, such as 70 surface clean of extra thin copper foil quickly produced.
As further improved, the cleaning unit 30 includes 10~20 and is arranged side by side in 33 upper nozzle of jet pipe
34.Preferably, the cleaning unit 30 is arranged side by side including 14~16 in 33 upper nozzle 34 of jet pipe.A reality wherein
Apply in example, the cleaning unit 30 includes 15 and is arranged side by side in 33 upper nozzle 34 of jet pipe, and two neighboring spray head 34 it
Between it is arranged in a crossed manner.
As further improved, the cleaning unit 30 can further comprise water squeezing rubber roller 35, be set to the spray head
34 top, and it is tangent to squeeze remaining moisture content on copper foil 70 with the cathode roll 20.
The transmission unit 40 includes the biography of stripper roll 41, first that diameter is all larger than equal to 200mm and is less than or equal to 300mm
Deflector roll 42, second conducts roller 43 and third conducts roller 44.The stripper roll 41 is set to the top of the cleaning unit 30, institute
The side that deactivation slot 80 is set to the stripper roll 41 is stated, the second conduction roller 43 is set in the deactivation slot 80, and institute
It states the first conduction roller 42 and third conduction roller 44 is symmetrically disposed on the top of the deactivation slot 80；The first conduction roller
42 uses are double to bearing.
The diameter of each conduction roller 42/43/44 is 250mm or so in one of the embodiments,.What is quickly produced is super
Thin copper foil 70 conducts greater than 200mm using big roller diameter conduction roller, and foil face stress can be made to disperse, what effective solution quickly produced
Extra thin copper foil 70 is easy the problem of corrugation in conductive process.It is single simultaneously to conduct on roller using double to design bearing, as far as possible
Resistance itself is reduced, conduction, the extra thin copper foil 70 that further effective solution quickly produces can be driven using lesser tension
The problem of corrugation is easy in conductive process.
As further improved, the transmission unit 40 can be such that the tension fluctuation of copper foil 70 is less than using closed-loop control
0.3KG, it is thus possible to which it is husky effectively to solve the bubble generated by tension fluctuation.
Referring to figure 5., as further improved, the first conduction roller 42 includes conduction roller main body 420, first bearing
421, shaft 422, second bearing 423 and support base 424；The first bearing 421 be sheathed on the conduction roller main body 420 with
And between the shaft 422；The both ends of the first bearing 421 are set to the support base 424 by the second bearing 423
On.
The rolling unit 60 includes the wind-up roll 62 that diameter is 250~350mm, and the control of its winding tension is in 12-
Between 14kg.As further improved, the rolling unit 60 further comprises lower compression roller 63, is set to the wind-up roll 62
Lower section.The winding of extra thin copper foil 70 that the present invention quickly produces uses the wind-up roll of 250~350mm of diameter, winding tension control
Between 12-14, while the precise controlling based on 70 surface density of extra thin copper foil, following plus lower compression roller is used while winding
63, keep the extra thin copper foil 70 quickly produced winding more smooth closely knit without soft line, end face consistency when guaranteeing to receive long paper.
As further improved, the rolling unit 60 further comprises that the 4th conduction roller 62 is set to the third and passes
Side of the deflector roll 44 far from the first conduction roller 42, and the 4th conduction roller 62, the third conduct roller 44 and first
Roller 42 is conducted to be arranged side by side.The wind-up roll 62 is set to the 4th conduction roller 62 far from first conduction, 42 side of roller
Lower end.
Fig. 6 is please referred to, the Drying and cooling unit 50 is set between the deactivation slot 80 and the rolling unit 60；
The Drying and cooling unit 50 includes the drying unit 51 close to the transmission unit 40 setting, and close to the rolling unit
The cooling unit 52 of 60 settings；The drying unit 51 includes symmetrically arranged upper hot wind knife 512 and lower hot wind knife 514, with
And it is connected to the hot air duct 516 of the upper hot wind knife 512 and the lower hot wind knife 514；The cooling unit 52 includes pair
Claim the upper cold knife 522 and lower cold knife 524 of setting, and is connected to the upper cold knife 522 and the lower cold knife
524 cold air duct 526.70 foil face of the extra thin copper foil drying that the present invention quickly produces uses two-sided air knife, and front row uses high temperature
Hot wind is uniformly quickly blown out, and heel row is uniformly quickly blown out using cold wind, guarantees prestissimo drying and cooling.The two-sided air knife
It is symmetrical arranged.
When the flow velocity of the drying unit 51 is too fast, it is easy to produce fold and destruction；When flow velocity is too small, it is difficult to meet fast
The demand of speed drying.As further improved, the flow velocity of the drying unit 51 is 400m3/ h, and temperature is 90~100
℃.The flow velocity of the cooling unit 52 is 210m3/ h, and temperature is 20~27 DEG C.
Fig. 7 is please referred to, the present invention also provides a kind of preparation methods of electrolytic copper foil, comprising the following steps:
Copper sulfate electrolyte configuration: S4 high-purity copper wire that purity is 99.95% or more is heated in sulfuric acid solution molten
Solution generates copper sulfate electrolyte；
S5, foil manufacture；Additive is added in the copper sulfate electrolyte, and is delivered in the electrolytic cell of foil machine and carries out
It is electrolysed foil, wherein；It is electrolysed the technological parameter of foil are as follows: the temperature control of electrolyte is at 50~60 DEG C, foil anodic
The current density of plate 12 is 38~45A/dm2, Cu2+Concentration is 90~95g/L, H2SO4Concentration is 100~110g/L, gelatin concentration
100-300ppm, the concentration of ceric sulfate are 0.5~10ppm, and the concentration of MESS is 1~20ppm, the concentration of SPS is 10~
50ppm, Cl-Concentration is 10~30ppm；
Anti-oxidation processing: S6 will be electrolysed resulting copper foil and carry out anti-oxidation processing；
Product cutting: S7 through anti-oxidation treated copper foil, is carried out cutting cutting and be packed.
In step s 5, it is preferred that Cu2+Concentration is 92~95g/L, H2SO4Concentration is 105~108g/L, electrolyte
Temperature is controlled at 55~60 DEG C.The gelatin concentration 150-250ppm, the concentration of ceric sulfate are 2~5ppm, the concentration of MESS
For 10~15ppm.The concentration of the SPS is 20~30ppm, Cl-Concentration is 25~30ppm.Contain ceric sulfate and MESS
Water solution A combination, can be adsorbed near electrode surface, effectively improve cathodic polarization, refine crystal grain, change coating crystal grain
Size, to improve coating hardness；Contain SPS and Cl-The combination of aqueous solution B can significantly improve the brightness of coating.
In step s 6, described the step of being electrolysed resulting copper foil progress anti-oxidation processing, includes:
S61 will be electrolysed resulting copper foil and be passivated in CrO3+T (chromium trioxide+glucose) solution, wherein passivation parameter
Are as follows: PH control is in 3-3.5, and at 20-40 DEG C, passivation current is controlled in 1-3A/dm for temperature control2.Because of 4-6 microns of extra thin copper foils
Speed of production it is fast, the time into transpassivation slot 80 shortens, and the 8-12 micron preparation method used before is no longer satisfied 4-6
The production requirement of micron electrolytic copper foil, leads to the anti-oxidant failure of electrolytic copper foil.The present invention now uses the configuration technique of CrO3+T, PH
Control is in 3-3.5, and at 20-40 DEG C, passivation current is controlled in 1-3A for temperature control, so that it is different to can effectively solve anti-oxidant failure etc.
The occurrence of normal.
In step S61, it is preferred that passivation parameter are as follows: at 25-30 DEG C, passivation current is controlled in 2A/dm for temperature control2。
Fig. 8-9 is please referred to, electrolytic copper foil is obtained by the above method the present invention also provides a kind of, it is micro- with a thickness of 4~6
Rice, tensile strength at normal temperature in 600~560MPa, tensile strength after being heated 15 minutes at 150 DEG C 350~
400MPa, and at normal temperature and 150 DEG C heat 15 minutes after elongation percentage reach 3.5-10%；And the high-intensitive cathode copper
The warpage of foil is less than or equal to 5mm.The warpage of the high intensity electrolytic copper foil will be by that will grow the bright face of copper foil print for being wider than 15cm
It is placed on pearl cotton upward；Then disk sampler is placed on copper foil print；By lower handle and rotate clockwise 180 °
It carries out cutting to form circular sample；Circular sample is overturn to hair side upward with steel ruler, finally measures round sample with steel ruler
The warpage of product edge 22 obtains.
As further improved, the glossiness of the high intensity electrolytic copper foil hair side is in 130-250Gu.
As further improved, the glossiness in the bright face of the high intensity electrolytic copper foil is in 60-100Gu.
As further improved, the high intensity electrolytic copper foil has uniform surface density, and surface density is 30~60
Gram/m.
The present invention also provides a kind of lithium ion secondary battery current collectors and lithium ion using above-mentioned high-intensitive electrolytic copper foil
Secondary cell.
In addition, the present invention also provides a kind of a kind of electromagnetic shielding materials being prepared using above-mentioned high-intensitive electrolytic copper foil
Material.
Embodiment: high-purity copper wire that purity is 99.95% is dissolved by heating in sulfuric acid solution and generates copper sulfate electrolyte；
Additive is added in the copper sulfate electrolyte, and is delivered in the electrolytic cell of foil machine and carries out electrolysis foil, wherein；Electrolysis life
The technological parameter of foil are as follows: the temperature control of electrolyte is at 58 DEG C, Cu2+Concentration is 94g/L, H2SO4Concentration is 106g/L, and gelatin is dense
150ppm is spent, the concentration of ceric sulfate is 4ppm, and the concentration of MESS is 12ppm, and the concentration of SPS is 25ppm, Cl-Concentration is
28ppm；Current density by controlling foil anodic plate obtains 4 microns, 4.5 microns, 5 microns and 6 microns respectively
Copper foil.It is as follows that various copper foils are subjected to test data:
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of cooling foil device of flash baking characterized by comprising the anode unit (10) that be electrically connected with anode and
The cathode roll (20) of cathode electrical connection and transmission unit (40), the Drying and cooling list for being set to the cathode roll (20) side
First (50) and rolling unit (60)；The Drying and cooling unit (50) is set to the deactivation slot (80) and the winding is single
Between first (60)；The Drying and cooling unit (50) includes the drying unit (51) close to the transmission unit (40) setting, with
And the cooling unit (52) close to the rolling unit (60) setting；The drying unit (51) includes symmetrically arranged upper hot wind
Knife (512) and lower hot wind knife (514), and it is connected to the heat of the upper hot wind knife (512) and the lower hot wind knife (514)
Air piping (516)；The cooling unit (52) includes symmetrically arranged upper cold knife (522) and lower cold knife (524), and
It is connected to the cold air duct (526) of the upper cold knife (522) and the lower cold knife (524)；The drying unit
Flow velocity be 400m3/ h, and temperature is 90~100 DEG C；The flow velocity of the cooling unit is 210m3/ h, and temperature is 20~27
℃。
2. the cooling foil device of flash baking as described in claim 1, which is characterized in that the cathode roll (20) includes being used for
The roll surface (21) of foil and the edge (22) for being set to the roll surface (21) two sides.
3. the cooling foil device of flash baking as claimed in claim 2, which is characterized in that the rough surface of the roll surface (21)
Degree meets: Ra < 0.2mm, Rz < 1.5mm.
4. the cooling foil device of flash baking as claimed in claim 2, which is characterized in that the edge (22) passes through hydrogen peroxide
Oxidation processes are formed.
5. the cooling foil device of flash baking as described in claim 1, which is characterized in that the transmission unit (40) includes the
Three conduction roller (44), and the rolling unit (60) further comprises the 4th conduction roller (62), and the described 4th conducts roller (62)
It is arranged side by side with third conduction roller (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335943.2A CN109943869B (en) | 2019-04-24 | 2019-04-24 | Quick drying and cooling foil generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335943.2A CN109943869B (en) | 2019-04-24 | 2019-04-24 | Quick drying and cooling foil generating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109943869A true CN109943869A (en) | 2019-06-28 |
| CN109943869B CN109943869B (en) | 2021-05-07 |
Family
ID=67014649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910335943.2A Active CN109943869B (en) | 2019-04-24 | 2019-04-24 | Quick drying and cooling foil generating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109943869B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534838A (en) * | 2020-06-16 | 2020-08-14 | 广东嘉元科技股份有限公司 | Electrolytic copper foil raw foil machine |
| CN114322519A (en) * | 2022-01-07 | 2022-04-12 | 广东嘉元科技股份有限公司 | Hot air drying equipment for electrolytic copper foil production |
| CN115574579A (en) * | 2022-09-09 | 2023-01-06 | 铜陵市华创新材料有限公司 | Air knife structure and copper foil anti-oxidation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534838A (en) * | 2020-06-16 | 2020-08-14 | 广东嘉元科技股份有限公司 | Electrolytic copper foil raw foil machine |
| CN114322519A (en) * | 2022-01-07 | 2022-04-12 | 广东嘉元科技股份有限公司 | Hot air drying equipment for electrolytic copper foil production |
| CN115574579A (en) * | 2022-09-09 | 2023-01-06 | 铜陵市华创新材料有限公司 | Air knife structure and copper foil anti-oxidation device |
| CN115574579B (en) * | 2022-09-09 | 2023-12-08 | 安徽华创新材料股份有限公司 | Air knife structure and copper foil oxidation preventing device |
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| Publication number | Publication date |
|---|---|
| CN109943869B (en) | 2021-05-07 |
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