CN111102807A - Drum-shaped liquid scraping roller, liquid scraping equipment and using method of drum-shaped liquid scraping roller - Google Patents
Drum-shaped liquid scraping roller, liquid scraping equipment and using method of drum-shaped liquid scraping roller Download PDFInfo
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- CN111102807A CN111102807A CN201911319608.XA CN201911319608A CN111102807A CN 111102807 A CN111102807 A CN 111102807A CN 201911319608 A CN201911319608 A CN 201911319608A CN 111102807 A CN111102807 A CN 111102807A
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- drum
- circular truncated
- truncated cones
- liquid scraping
- roller
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- 239000007788 liquid Substances 0.000 title claims abstract description 75
- 238000007790 scraping Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims description 10
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a drum-shaped liquid scraping roller which comprises a cylindrical section, two curved circular truncated cones, two first circular truncated cones and two second circular truncated cones, wherein the cylindrical section is located in the middle, the two sides of the cylindrical section are respectively and sequentially connected with the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones, and the cylindrical section, the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones are in smooth transition. The structure can be in full and uniform contact with a diaphragm to be scraped, the liquid scraping effect is good, the white spot defect after the diaphragm is extracted is effectively eliminated, and the yield improvement effect of the diaphragm close to the thick edges on the two sides of the diaphragm is remarkable.
Description
Technical Field
The invention relates to the technical field of lithium battery diaphragm production, in particular to a drum-shaped liquid scraping roller, liquid scraping equipment and a using method of the drum-shaped liquid scraping roller.
Background
In the production process of the lithium battery diaphragm, extraction is an important process in wet production. In the extraction production process, after the diaphragm passes through the extraction tank, liquid scraping and drying are needed, common liquid scraping equipment is carried out by a liquid scraping roller or a scraper bar, residual extraction liquid is scraped, and then the residual extraction liquid enters an oven to be heated by hot air and a hot roller, and the residual extraction liquid dichloromethane and the like on the diaphragm are dried.
However, in the process prior to the extraction, i.e., the transverse drawing process, both sides of the separator need to be held by clips, and the held portions of both sides of the separator are not stretched and are thick. After extraction, when the diaphragm passes through a straight strip-shaped liquid scraping roller, thick edges on two sides usually contact with the roller surface of the liquid scraping roller firstly, and the contact between the middle part of the diaphragm and the liquid scraping roller is poor, so that the residual extraction liquid on the surface of the diaphragm cannot be effectively scraped completely when the diaphragm passes through the liquid scraping roller, product defects such as watermarks and the like caused by uneven liquid scraping are caused on the length of about 200-300mm from the thick edges on the two sides to the middle part of the diaphragm, and the production yield of products is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defect of uneven liquid scraping of a straight strip-shaped liquid scraping roller in the prior art, and provides a drum-shaped liquid scraping roller which comprises a cylindrical section, two curved circular truncated cones and two second circular truncated cones, wherein the drum-shaped liquid scraping roller can be fully and uniformly contacted with a diaphragm to be scraped.
In another aspect of the invention, a liquid scraping apparatus is provided.
In another aspect of the invention, a method for using the liquid scraping equipment is provided.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the drum-shaped liquid scraping roller comprises a cylindrical section, two curved circular truncated cones, two first circular truncated cones and two second circular truncated cones, wherein the cylindrical section is located in the middle, the two sides of the cylindrical section are respectively and sequentially connected with the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones, and the cylindrical section, the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones are in smooth transition to prevent the surface of a diaphragm from being scratched by a roller surface.
Note: the curved surface circular truncated cone is a circular truncated cone with a curved surface on the side surface, and a generatrix in the curved surface circular truncated cone is an arc line.
Wherein, the cylinder section is located the intermediate position of drum-shaped wiping roller, with diaphragm middle part uniform contact.
The two curved surface circular truncated cones are used for promoting the diaphragm to sink up and down in the transverse direction to form an arc-shaped package so as to promote the diaphragm to be evenly and tightly attached to the roller surface in the section, the length of the section is adjusted according to the width of the diaphragm produced actually, and the width of the diaphragm of the cylindrical section and the two curved surface circular truncated cone sections is ensured to be consistent with the width of the diaphragm in the winding process.
The two first round tables are diameter abrupt change sections, so that thick edges on two sides of the diaphragm are enabled to sink, and the cylindrical section and the two curved round tables are ensured to be in complete contact with the diaphragm.
The two second round tables are the positions of the two thick edges of the diaphragm, so that the diameter of the roller is further reduced, and the diaphragm at the thick edges can not influence the contact between the diaphragm at the middle part and the roller surface.
In the technical scheme, the whole length of the roller surface of the drum-shaped liquid scraping roller is 2400-5000mm, the width of the lithium battery diaphragm production line is 2000-4000 mm, and the drum-shaped liquid scraping roller and the lithium battery diaphragm production line are matched.
In the technical scheme, the length of the cylindrical section is 1/5-1/4 of the whole length of the drum-shaped wiping roller; the diameter of the cylindrical section is 50-150 mm.
In the technical scheme, the length of each curved circular truncated cone is 1/4-1/3 of the whole length of the drum-shaped liquid scraping roller.
In the technical scheme, because the diameter value of the diaphragm thick edge changes suddenly on a smaller length, in order to facilitate the thick edge to sink, the length of each first circular table is 15-25mm, the thickness of the thick edge in actual diaphragm production is about 1mm, and in order to enable the thick edge to sink completely and cling to the roller surface, the diameter difference of two ends is 1-3 mm.
In the technical scheme, the length of each second round table is 100-300mm and is matched with the width of a thick edge generated in the actual production process of the diaphragm; the thick edge part is irregular in shape, and the like with the diameter difference of 2-5mm can occur due to 2-3mm of protrusion.
In the technical scheme, a hollow channel is arranged in the drum-shaped liquid scraping roller, and a heating medium is filled in the hollow channel.
In the technical scheme, the two ends of the drum-shaped liquid scraping roller are respectively provided with a snap spring groove which can be connected with a bearing.
In another aspect of the invention, the diaphragm liquid scraping device comprises the drum-shaped liquid scraping roller, a support for supporting the drum-shaped liquid scraping roller, a motor for driving one end of the drum-shaped liquid scraping roller to rotate, and a mold temperature controller connected with two ends of a hollow channel of the drum-shaped liquid scraping roller.
In another aspect of the present invention, a method for using the above membrane liquid scraping apparatus includes the following steps:
step 1: mounting a drum-shaped liquid scraping roller and adjusting the level;
step 2: starting a motor, and adjusting the linear speed of the roller surface of the drum-shaped liquid scraping roller to be consistent with the actual linear speed of a diaphragm production line;
and step 3: and starting the mold temperature controller to perform constant temperature control on the heating medium in the hollow channel.
Compared with the prior art, the invention has the beneficial effects that:
1. the drum-shaped liquid scraping roller provided by the invention comprises a cylindrical section, two curved circular truncated cones, two first circular truncated cones and two second circular truncated cones, the drum-shaped liquid scraping roller can be fully and uniformly contacted with a diaphragm to be scraped, the liquid scraping effect is better, the white spot defect after extraction of the diaphragm is effectively eliminated, and the yield improvement effect on the diaphragm close to the thick edges on the two sides of the diaphragm is remarkable.
2. The drum-shaped liquid scraping roller provided by the invention is provided with the clamp spring grooves at two ends, and can be provided with the bearing to rotate along with the motor, so that the phenomenon that the traditional fixed liquid scraping roller or a scraper bar scratches the surface of a diaphragm is avoided.
3. The center of the drum-shaped liquid scraping roller is of a hollow structure, and the hollow channel is filled with a heating medium which can heat the diaphragm, so that the subsequent drying speed is promoted.
Drawings
Fig. 1 shows a schematic structural view of a drum doctor roll.
Fig. 2 is a schematic structural diagram of the liquid scraping device.
In the figure: 1-cylindrical section, 2-curved circular truncated cone, 3-first circular truncated cone, 4-second circular truncated cone, 5-jump ring groove, 6-hollow channel, 7-motor, 8-mold temperature controller, 9-rotary joint, 10-beam, 11-bearing, 12-motor fixing seat, 13-belt pulley, 14-belt, 15-pipeline.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A drum-shaped liquid scraping roller comprises a cylindrical section 1, two curved circular truncated cones 2, two first circular truncated cones 3 and two second circular truncated cones 4, wherein the cylindrical section 1 is located in the middle, the two sides of the cylindrical section are respectively and sequentially connected with the curved circular truncated cones 2, the first circular truncated cones 3 and the second circular truncated cones 4, and the cylindrical section 1, the curved circular truncated cones 2, the first circular truncated cones 3 and the second circular truncated cones 4 are in smooth transition.
The liquid scraping roller with the drum-shaped structure is fully contacted with the diaphragm, and plays a certain flattening role. While preventing poor contact of the middle portion due to the thick edges. The arrangement of the first round platform and the second round platform can enable the diaphragm close to the thick edges on the two sides of the diaphragm to be in full contact with the liquid scraping roller, and the yield of the diaphragm close to the thick edges on the two sides of the diaphragm is improved.
Specifically, the overall length of the roll surface of the drum-shaped liquid scraping roll is 2400mm, wherein the length of the cylindrical section 1 is 600mm, the length of each curved circular truncated cone 2 is 600mm, the length of each first circular truncated cone 3 is 15mm, and the length of each second circular truncated cone 4 is 285 mm. The diameter of the cylindrical section 1 is 50mm, the diameter of the thick end of each first circular truncated cone 3 is 58mm, the diameter of the thin end of each first circular truncated cone 3 is 57mm, the diameter difference between the two ends is 1mm, the diameter of the thick end of each second circular truncated cone 4 is 57mm, the diameter of the thin end of each second circular truncated cone 4 is 55mm, the diameter difference between the two ends is 2mm, and each curved circular truncated cone 2 is respectively and smoothly connected with the cylindrical section 1 and the corresponding first circular truncated cone 3.
After the membrane is taken out of the extraction tank, relative motion is generated between the membrane and the liquid scraping roller, and liquid scraping is carried out by means of the relative motion, so that the surface of the membrane is easily scratched.
As a preferable structure, the two ends of the drum-shaped liquid scraping roller are respectively provided with a clamp spring groove 5, and bearings can be installed, so that the drum-shaped liquid scraping roller rotates along with a motor, does not move relative to a diaphragm, and presses liquid on the surface of the diaphragm by the pressure of the diaphragm on the roller, thereby preventing the surface of the diaphragm from being scratched.
As a preferable structure, the drum-shaped liquid scraping roller is internally provided with a hollow channel 6, and the hollow channel is filled with heating media, such as hot water and hot steam. The roller can be heated by a heating medium to promote the drying effect.
Example 2
A drum-shaped liquid scraping roller comprises a cylindrical section 1, two curved circular truncated cones 2, two first circular truncated cones 3 and two second circular truncated cones 4, wherein the cylindrical section 1 is located in the middle, the two sides of the cylindrical section are respectively and sequentially connected with the curved circular truncated cones 2, the first circular truncated cones 3 and the second circular truncated cones 4, and the cylindrical section 1, the curved circular truncated cones 2, the first circular truncated cones 3 and the second circular truncated cones 4 are in smooth transition.
Specifically, the drum-shaped liquid scraping roller has an overall length of 5000mm, wherein the length of the cylindrical section 1 is 1000mm, the length of each curved circular truncated cone 2 is 1700mm, the length of each first circular truncated cone 3 is 25mm, and the length of each second circular truncated cone 4 is 275 mm. The diameter of the cylindrical section 1 is 120mm, the diameter of the thick end of each first circular truncated cone 3 is 118mm, the diameter of the thin end of each first circular truncated cone 3 is 117mm, the diameter difference between the two ends is 1mm, the diameter of the thick end of each second circular truncated cone 4 is 117mm, the diameter of the thin end of each second circular truncated cone 4 is 115mm, the diameter difference between the two ends is 2mm, and each curved circular truncated cone 2 is respectively and smoothly connected with the cylindrical section 1 and the corresponding first circular truncated cone 3.
Example 3
A diaphragm wiping device, as shown in fig. 2, comprises the drum wiping roller of embodiment 1, a support for supporting the drum wiping roller, a motor 7 for driving one end of the drum wiping roller to rotate, and a mold temperature controller 8 connected to two ends of a hollow channel 6 of the drum wiping roller.
The bracket comprises a base (not shown in the figure) and two cross beams 10, and two ends of the drum-shaped liquid scraping roller are respectively and rotatably connected to the two cross beams 10 through bearings 11; the motor 7 is fixed on the outer side of the cross beam 10 through a motor fixing seat 12, belt pulleys 13 are respectively mounted on an output shaft of the motor 7 and one end of the drum-shaped liquid scraping roller, and the belt pulleys are connected through a belt 14, so that the motor 7 drives the drum-shaped liquid scraping roller to rotate; and rotary joints 9 are arranged at two ends of the drum-shaped liquid scraping roller, and the rotary joints 9 are connected with a mold temperature controller 8 through pipelines 15.
The level and the parallelism are adjusted after the drum-shaped liquid scraping roller is installed, the drum-shaped liquid scraping roller is driven by a motor 7 fixed on a motor fixing seat 12 to rotate, the adjustment is carried out according to the speed of the diaphragm production line, and the consistency of the linear speed of the roller surface of the drum-shaped liquid scraping roller and the actual linear speed of the diaphragm production line is ensured. Rotary joints 9 are installed at two ends of the liquid scraping roller, the rotary joints 9 are connected with a mold temperature controller 8 device through a pipeline 15, a circulating pump and an adjusting valve of the mold temperature controller 8 are used for carrying out constant temperature control on a heating medium inside a central control channel 6 of the drum-shaped liquid scraping roller, the temperature of the drum-shaped liquid scraping roller contacting with a diaphragm is guaranteed to be constant, and the drying effect of the diaphragm is guaranteed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The drum-shaped liquid scraping roller is characterized by comprising a cylindrical section, two curved circular truncated cones, two first circular truncated cones and two second circular truncated cones, wherein the cylindrical section is located in the middle, the two sides of the cylindrical section are respectively and sequentially connected with the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones, and the cylindrical section, the curved circular truncated cones, the first circular truncated cones and the second circular truncated cones are in smooth transition.
2. The drum doctor roll as claimed in claim 1, wherein the overall length of the roll surface of the drum doctor roll is 2400-5000 mm.
3. The drum doctor roll of claim 1, wherein said cylindrical section has a length 1/5-1/4 of the overall length of the roll surface of said drum doctor roll; the diameter of the cylindrical section is 50-150 mm.
4. The drum doctor roll of claim 1, wherein each of said curved circular truncated cones has a length 1/4-1/3 of an overall length of said drum doctor roll.
5. The drum doctor roll of claim 1, wherein each of said first round tables has a length of 15-25mm and a diameter differential of 1-3mm between ends.
6. The drum doctor roll as claimed in claim 1, wherein each of said second round tables has a length of 100-300mm and a diameter difference of 2-5 mm.
7. The drum doctor roll of claim 1, wherein said drum doctor roll has a hollow channel disposed therein, said hollow channel containing a heating medium.
8. The drum doctor roll as claimed in claim 7, wherein both ends of said drum doctor roll are provided with snap spring grooves, respectively, which are connectable with bearings.
9. A diaphragm wiping device comprising the drum wiping roller of claim 8, a support for supporting the drum wiping roller, a motor for driving one end of the drum wiping roller to rotate, and a mold temperature controller connected to both ends of a hollow channel of the drum wiping roller.
10. The method of using a membrane scraping apparatus as claimed in claim 9, comprising the steps of:
step 1: mounting a drum-shaped liquid scraping roller and adjusting the level;
step 2: starting a motor, and adjusting the linear speed of the roller surface of the drum-shaped liquid scraping roller to be consistent with the actual linear speed of a diaphragm production line;
and step 3: and starting the mold temperature controller to perform constant temperature control on the heating medium in the hollow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911319608.XA CN111102807B (en) | 2019-12-19 | 2019-12-19 | Drum-shaped liquid scraping roller, liquid scraping equipment and using method of drum-shaped liquid scraping roller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911319608.XA CN111102807B (en) | 2019-12-19 | 2019-12-19 | Drum-shaped liquid scraping roller, liquid scraping equipment and using method of drum-shaped liquid scraping roller |
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| Publication Number | Publication Date |
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| CN111102807A true CN111102807A (en) | 2020-05-05 |
| CN111102807B CN111102807B (en) | 2021-09-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902564A (en) * | 2021-01-21 | 2021-06-04 | 中材大装膜技术工程(大连)有限公司 | Thin film liquid scraping system |
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| US6418640B1 (en) * | 1999-05-31 | 2002-07-16 | Hitachi Electronics Engineering Co., Ltd. | Drying apparatus for a substrate and drying method thereof |
| CN205376616U (en) * | 2016-01-27 | 2016-07-06 | 四川思博瀚宇新材料有限公司 | Liquid device is scraped in extraction of lithium ion battery diaphragm |
| CN206947424U (en) * | 2017-06-29 | 2018-01-30 | 苏州捷力新能源材料有限公司 | Extraction liquid scraping device for lithium battery diaphragm |
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| CN207695365U (en) * | 2017-11-23 | 2018-08-07 | 合肥国轩高科动力能源有限公司 | Convex flattening roller for lithium battery roller press |
| CN208662141U (en) * | 2018-07-23 | 2019-03-29 | 包头钢铁（集团）有限责任公司 | A kind of furnace delivery table |
| CN209434274U (en) * | 2019-02-12 | 2019-09-24 | 威海星宜新材料科技有限公司 | A kind of even sliding device of wet process lithium ion battery separator scraping fluid |
| JP6705613B2 (en) * | 2016-03-14 | 2020-06-03 | 理想科学工業株式会社 | Paper feeding device and paper feeding method of paper feeding device |
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2019
- 2019-12-19 CN CN201911319608.XA patent/CN111102807B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6418640B1 (en) * | 1999-05-31 | 2002-07-16 | Hitachi Electronics Engineering Co., Ltd. | Drying apparatus for a substrate and drying method thereof |
| CN205376616U (en) * | 2016-01-27 | 2016-07-06 | 四川思博瀚宇新材料有限公司 | Liquid device is scraped in extraction of lithium ion battery diaphragm |
| JP6705613B2 (en) * | 2016-03-14 | 2020-06-03 | 理想科学工業株式会社 | Paper feeding device and paper feeding method of paper feeding device |
| CN206947424U (en) * | 2017-06-29 | 2018-01-30 | 苏州捷力新能源材料有限公司 | Extraction liquid scraping device for lithium battery diaphragm |
| CN207204674U (en) * | 2017-07-03 | 2018-04-10 | 河北金力新能源科技股份有限公司 | A kind of self-cleaning scraping fluid mechanism |
| CN207695365U (en) * | 2017-11-23 | 2018-08-07 | 合肥国轩高科动力能源有限公司 | Convex flattening roller for lithium battery roller press |
| CN208662141U (en) * | 2018-07-23 | 2019-03-29 | 包头钢铁（集团）有限责任公司 | A kind of furnace delivery table |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112902564A (en) * | 2021-01-21 | 2021-06-04 | 中材大装膜技术工程(大连)有限公司 | Thin film liquid scraping system |
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| CN111102807B (en) | 2021-09-10 |
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