Method for solving problems of wrinkles and bright lines in wet diaphragm extraction

Abstract

The invention relates to a method for solving the problem of wrinkles and bright lines in wet process diaphragm extraction, and belongs to the technical field of diaphragm production, the method comprises the following steps: S1, optimizing extraction process parameters; s2, improving the design of an extraction device; s3, introducing an extraction post-treatment technology; s4, establishing a real-time quality monitoring and feedback control system; wherein the step S1 comprises accurate control of extraction temperature, accurate setting of extraction time and stable control of flow and concentration of an extraction agent; the step S2 comprises designing a multi-stage extraction structure, improving an extraction agent distribution system and adopting a low-stress diaphragm fixing mode; the step S3 comprises the substeps of adopting a gradient drying process and carrying out annealing treatment; the step S4 comprises establishing an online defect detection system, establishing a data acquisition and analysis system and establishing a closed-loop feedback control system. According to the invention, the possibility of occurrence of wrinkles and bright lines is reduced, and the production quality of the diaphragm is improved.

Description

Technical Field

[0001] The present application relates to the field of diaphragm production, and in particular to a method for solving the problem of wrinkles and bright lines in wet diaphragm extraction. Background Art

[0002] Extraction is a key step in the production of wet-process diaphragms, which directly affects the microstructure and macroscopic properties of the diaphragm. During the extraction process, factors such as the exchange rate between the extractant and the organic solvent in the film, temperature, time, and the stress on the film are intertwined and jointly determine the final quality of the diaphragm. If the extraction conditions are not properly controlled, such as uneven concentration of the extractant, large temperature fluctuations, too long or too short extraction time, etc., it may cause uneven shrinkage or expansion of the film in the microstructure, which in turn causes wrinkle bright line problems.

[0003] In the traditional wet-process diaphragm production process, the control of the extraction link often relies on empirical process parameter settings and relatively simple equipment configurations. For example, in terms of extraction temperature control, only simple heating or cooling devices may be used, which makes it difficult to achieve accurate and real-time temperature control; in the supply and circulation system of the extractant, there is a lack of accurate monitoring and feedback control mechanisms for parameters such as the flow rate and concentration of the extractant. In addition, the traditional production process has poor flexibility when dealing with the production of diaphragms of different specifications and materials. It is difficult to quickly and accurately adjust the extraction process parameters according to actual conditions, and thus it is impossible to effectively avoid the occurrence of wrinkle bright line problems. Summary of the invention

[0004] In order to reduce the possibility of wrinkle bright line problem, the present application provides a method for solving the wrinkle bright line problem in wet membrane extraction.

[0005] The present application provides a method for solving the problem of wrinkle bright lines in wet diaphragm extraction, which adopts the following technical solution:

[0006] A method for solving the problem of wrinkle bright lines in wet diaphragm extraction comprises the following steps:

[0007] S1. Optimize extraction process parameters;

[0008] S2. Improve the design of extraction device;

[0009] S3, introduction of post-extraction processing technology;

[0010] S4. Establish a real-time quality monitoring and feedback control system;

[0011] The step S1 includes precise control of the extraction temperature, precise setting of the extraction time and stable control of the flow rate and concentration of the extractant;

[0012] The step S2 includes designing a multi-stage extraction structure, improving the extractant distribution system and adopting a low-stress diaphragm fixing method;

[0013] The step S3 includes adopting a gradient drying process and performing an annealing treatment;

[0014] The step S4 includes establishing an online defect detection system, establishing a data acquisition and analysis system, and establishing a closed-loop feedback control system.

[0015] Optionally, the precise control of the extraction temperature further comprises:

[0016] S111. Install a high-precision temperature sensor and an intelligent temperature control system in the extraction device to achieve accurate monitoring and real-time adjustment of the extraction temperature;

[0017] S112, determining the optimal extraction temperature curve corresponding to different diaphragm materials and thicknesses through experiments;

[0018] S113, using a PID controller to control the fluctuation range of the extraction temperature within a very small range, and strictly follow the optimal extraction temperature curve determined in step S112 during the extraction process.

[0019] Optionally, the precise setting of the extraction time further comprises:

[0020] S121, accurately calculating the appropriate extraction time according to the specific specifications of the diaphragm and the properties of the extractant used;

[0021] S122, using an electronic timer or a time module in a PLC, the extraction time is set to the extraction time calculated in step S121, to ensure that the extraction process is completed within a predetermined time.

[0022] Optionally, the stable control of the flow rate and concentration of the extractant further comprises:

[0023] S131, installing a flow sensor and a concentration monitor in the extraction device to monitor the flow rate and concentration of the extraction agent in real time;

[0024] S132, by real-time flow monitoring, the flow of the extractant is kept uniform and stable throughout the extraction process to prevent uneven stress on the diaphragm caused by excessively fast or slow flow of the extractant in some places;

[0025] S133. Through online concentration analysis, timely supplement or adjust the composition of the extractant to ensure that its concentration meets the process requirements in order to maintain a stable extraction effect.

[0026] Optionally, designing a multi-stage extraction structure specifically includes: S21, designing a multi-stage extraction unit connected in series, so that the diaphragm passes through extraction areas with different conditions in sequence;

[0027] The improvement of the extractant distribution system specifically includes: S22, setting an extractant equalizing device in each extraction tank of the extraction device, and optimizing the internal flow channel design of each extraction tank, so that the extractant forms a stable and uniform flow field in the extraction tank;

[0028] The low-stress diaphragm fixing method specifically includes: S23, using a flexible fixing fixture or supporting roller with good supporting performance to fix the position of the diaphragm during the extraction process, and designing a diaphragm transmission system with adjustable tension to accurately control its tension during the extraction process according to the material and thickness of the diaphragm.

[0029] Optionally, the step S21 further includes:

[0030] S211, using a lower concentration of extractant and a slower flow rate in the primary extraction area to gently remove most of the organic solvent in the diaphragm;

[0031] S212. Gradually increase the concentration and flow rate of the extractant in subsequent extraction areas to achieve more thorough extraction.

[0032] Optionally, the gradient drying process specifically includes: S31, in the drying step after extraction, using a gradient temperature increase drying technology to relieve stress generated during the drying process;

[0033] The annealing treatment specifically includes: S32, performing a precisely controlled annealing treatment on the dried diaphragm to relax the molecular chains inside the diaphragm and eliminate the internal stress generated during the extraction and drying process.

[0034] Optionally, the gradient temperature rising drying technology in step S31 further includes:

[0035] S311, firstly perform preliminary drying at a relatively low temperature and a relatively low wind speed, so that the solvent on the surface of the diaphragm evaporates slowly, thereby reducing the surface shrinkage and wrinkles caused by the rapid evaporation of the solvent;

[0036] S312, as the drying process proceeds, gradually increase the temperature and wind speed to accelerate the diffusion and evaporation of the internal solvent, and finally complete the drying;

[0037] When performing step S32, a suitable annealing temperature and time are selected according to the material properties of the diaphragm, and the annealing treatment is performed under the protection of an inert gas.

[0038] Optionally, establishing an online defect detection system specifically includes:

[0039] S411. Install advanced optical inspection equipment at key locations of the extraction production line, and use image processing algorithms and intelligent recognition technology to quickly and accurately detect wrinkle bright line defects;

[0040] S412, feeding back the defect information detected in step S411 to the control system of the extraction process in real time;

[0041] The establishment of data collection and analysis system specifically includes:

[0042] S421. Establish a complete data acquisition system to collect various process parameters in the extraction process and the quality data of the diaphragm;

[0043] S422, using big data analysis technology, deeply mining and analyzing the process parameters in step S421 and the quality data of the diaphragm, establishing a mathematical model between the process parameters and the quality data of the diaphragm, and realizing accurate prediction and optimization control of the extraction process;

[0044] The establishment of a closed-loop feedback control system specifically includes:

[0045] S431, combining the online defect detection system, the data acquisition and analysis system and the control system of the extraction process to form a closed-loop feedback control loop;

[0046] S432. When the online defect detection system detects a wrinkle bright line defect, the control system of the extraction process automatically adjusts the process parameters according to the preset rules, or initiates corresponding corrective measures to promptly correct deviations in the production process to ensure that the quality of the produced diaphragm meets the requirements.

[0047] Optionally, the process parameters of step S421 include temperature, pressure, flow rate, concentration and time; the quality data in step S421 include thickness uniformity, porosity and wrinkle bright line conditions.

[0048] In summary, the present application includes at least one of the following beneficial technical effects:

[0049] 1. By optimizing the extraction process parameters, firstly, by precisely controlling the extraction temperature, the wrinkles and bright lines caused by inconsistent shrinkage of the diaphragm due to uneven temperature can be reduced; secondly, by accurately setting the extraction time, the extraction process can be ensured to be completed within the predetermined time, avoiding diaphragm quality problems caused by over-extraction or under-extraction, including the appearance of wrinkles and bright lines; thirdly, by stably controlling the flow rate and concentration of the extractant, the uneven force on the diaphragm caused by excessive or slow flow of the local extractant can be prevented, ensuring that its concentration meets the process requirements, which is conducive to maintaining a stable extraction effect and reducing the wrinkles and bright lines caused by extractant factors.

[0050] 2. By improving the design of the extraction device, firstly, by designing a multi-stage extraction structure, the diaphragm can gradually adapt to the extraction process at different stages, reducing the stress concentration and wrinkle lines caused by the instantaneous and drastic solvent exchange; secondly, by improving the extractant distribution system, the extractant forms a stable and uniform flow field in the tank, ensuring that the diaphragm is uniformly acted upon by the extractant during the extraction process, thereby reducing the probability of wrinkle lines; thirdly, by adopting a low-stress diaphragm fixing method, it can not only ensure that the diaphragm remains flat during the extraction process, but also reduce scratches and stress concentration caused by hard contact, thereby reducing the occurrence of wrinkle lines.

[0051] 3. By introducing post-extraction processing technology, on the one hand, by adopting a gradient drying process, the stress generated in the diaphragm during the post-extraction drying process can be effectively alleviated, and the probability of the occurrence of wrinkle bright lines can be reduced; on the other hand, by annealing treatment, the molecular chains inside the diaphragm can be relaxed, and the internal stress generated during the extraction and drying process can be eliminated, further improving the flatness of the diaphragm and reducing the occurrence of bright lines. At the same time, the annealing process can also optimize the microstructure of the diaphragm and improve its comprehensive performance.

[0052] 4. By establishing a real-time quality monitoring and feedback control system, on the one hand, by establishing a real-time quality monitoring and feedback control system, the surface quality of the diaphragm can be monitored in real time; on the other hand, by establishing a data acquisition and analysis system, accurate prediction and optimal control of the extraction process can be achieved; on the third hand, by establishing a closed-loop feedback control system, the process parameters in the extraction process can be automatically adjusted, or deviations in the production process can be corrected in time to ensure that the quality of the produced diaphragm meets the requirements and effectively solve the problem of wrinkle bright lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a flow chart of a method for solving the problem of wrinkle bright lines in wet membrane extraction according to an embodiment of the present application.

[0054] Figure 2 This is a picture showing the optimal extraction temperature curve set by the PID controller in the embodiment of the present application. DETAILED DESCRIPTION

[0055] The following combination Figure 1 and Figure 2 , further details of this application are given.

[0056] Example:

[0057] The present application embodiment discloses a method for solving the problem of wrinkle bright line in wet diaphragm extraction. Figure 1 , a method for solving the problem of wrinkle bright lines in wet diaphragm extraction, comprising the following steps:

[0058] S1. Optimize extraction process parameters;

[0059] S2. Improve the design of extraction device;

[0060] S3, introduction of post-extraction processing technology;

[0061] S4. Establish a real-time quality monitoring and feedback control system;

[0062] Step S1 includes precise control of the extraction temperature, precise setting of the extraction time, and stable control of the flow rate and concentration of the extractant;

[0063] Step S2 includes designing a multi-stage extraction structure, improving an extractant distribution system, and adopting a low-stress diaphragm fixing method;

[0064] Step S3 includes adopting a gradient drying process and performing an annealing process;

[0065] Step S4 includes establishing an online defect detection system, establishing a data acquisition and analysis system, and establishing a closed-loop feedback control system.

[0066] The precise control of extraction temperature further includes:

[0067] S111. Install a high-precision temperature sensor and an intelligent temperature control system in the extraction device to achieve accurate monitoring and real-time adjustment of the extraction temperature;

[0068] S112, determining the optimal extraction temperature curve corresponding to different diaphragm materials and thicknesses through experiments;

[0069] S113, using PID controller, such as Figure 2 As shown, the fluctuation range of the extraction temperature is controlled within a very small range (eg, ±0.5° C.), and during the extraction process, the optimal extraction temperature curve determined in step S112 is strictly followed.

[0070] The precise setting of extraction time further includes:

[0071] S121, accurately calculating the appropriate extraction time according to the specific specifications of the diaphragm (such as thickness, porosity requirements, etc.) and the properties of the extractant used;

[0072] S122, using an electronic timer or a time module in a PLC, the extraction time is set to the extraction time calculated in step S121, to ensure that the extraction process is completed within a predetermined time.

[0073] The stable control of the flow rate and concentration of the extractant further includes:

[0074] S131, installing a flow sensor and a concentration monitor in the extraction device to monitor the flow rate and concentration of the extraction agent in real time;

[0075] S132, by real-time flow monitoring, the flow of the extractant is kept uniform and stable throughout the extraction process to prevent uneven stress on the diaphragm caused by excessively fast or slow flow of the extractant in some places;

[0076] S133. Through online concentration analysis, timely supplement or adjust the composition of the extractant to ensure that its concentration meets the process requirements in order to maintain a stable extraction effect.

[0077] The design of the multi-stage extraction structure specifically includes:

[0078] S21, designing a multi-stage series extraction unit so that the diaphragm passes through extraction areas with different conditions in sequence;

[0079] Step S21 further includes: S211, using a lower concentration of extractant and a slower flow rate in the primary extraction area to gently remove most of the organic solvent in the diaphragm; S212, gradually increasing the concentration and flow rate of the extractant in subsequent extraction areas to achieve more thorough extraction.

[0080] The improvement of the extractant distribution system specifically includes: S22, setting an extractant equalizing device in each extraction tank of the extraction device, and optimizing the internal flow channel design of each extraction tank, so that the extractant forms a stable and uniform flow field in the extraction tank;

[0081] The low-stress diaphragm fixing method specifically includes: S23, using a flexible fixing fixture or support roller with good support performance to fix the position of the diaphragm during the extraction process, and designing a diaphragm transmission system with adjustable tension to accurately control the tension during the extraction process according to the material and thickness of the diaphragm. In this embodiment, the part of the fixing fixture or support roller in step S23 that is used to contact the diaphragm is made of silicone or polyurethane material, which can not only ensure that the diaphragm remains flat during the extraction process, but also reduce scratches and stress concentration caused by hard contact.

[0082] The gradient drying process specifically includes: S31, in the drying step after extraction, using a gradient temperature increase drying technology to relieve stress generated during the drying process;

[0083] The gradient temperature rising drying technology in step S31 further includes:

[0084] S311, firstly perform preliminary drying at a relatively low temperature (e.g., 40-50° C.) and a relatively low wind speed to allow the solvent on the surface of the diaphragm to evaporate slowly, thereby reducing surface shrinkage and wrinkles caused by rapid evaporation of the solvent;

[0085] S312. As the drying process proceeds, the temperature (eg, 60-80°C) and wind speed are gradually increased to accelerate the diffusion and evaporation of the internal solvent, and finally complete the drying.

[0086] The annealing treatment specifically includes: S32, performing a precisely controlled annealing treatment on the dried membrane to relax the molecular chains inside the membrane and eliminate the internal stress generated during the extraction and drying process. When performing step S32, according to the material properties of the membrane, a suitable annealing temperature (e.g., 100-120°C) and time (e.g., 1-2h) are selected, and the annealing treatment is performed under the protection of an inert gas (e.g., nitrogen).

[0087] The establishment of an online defect detection system specifically includes:

[0088] S411. Install advanced optical inspection equipment (such as high-resolution CCD cameras or laser scanning systems) at key locations of the extraction production line, and use image processing algorithms and intelligent recognition technology to quickly and accurately detect wrinkle bright line defects;

[0089] S412, feeding back the defect information detected in step S411 to the control system of the extraction process in real time;

[0090] The establishment of data collection and analysis system specifically includes:

[0091] S421. Establish a complete data acquisition system to collect various process parameters in the extraction process and the quality data of the diaphragm. The process parameters include temperature, pressure, flow rate, concentration and time, and the quality data include thickness uniformity, porosity and wrinkle bright line conditions;

[0092] S422, using big data analysis technology, deeply mining and analyzing the process parameters in step S421 and the quality data of the diaphragm, establishing a mathematical model between the process parameters and the quality data of the diaphragm, and realizing accurate prediction and optimization control of the extraction process;

[0093] The establishment of a closed-loop feedback control system specifically includes:

[0094] S431, combining the online defect detection system, the data acquisition and analysis system and the control system of the extraction process to form a closed-loop feedback control loop;

[0095] S432. When the online defect detection system detects a wrinkle bright line defect, the control system of the extraction process automatically adjusts the process parameters according to preset rules, or initiates corresponding corrective measures (such as marking or sorting defective diaphragms) to promptly correct deviations in the production process and ensure that the quality of the produced diaphragms meets the requirements.

[0096] In summary, the method for solving the problem of wrinkle bright lines in wet diaphragm extraction according to the embodiment of the present application has the following beneficial effects:

[0097] A. By optimizing the extraction process parameters, firstly, by precisely controlling the extraction temperature, the wrinkle and bright line caused by the inconsistent shrinkage of the diaphragm due to uneven temperature can be reduced; secondly, by accurately setting the extraction time, the extraction process can be ensured to be completed within the predetermined time, avoiding the quality problems of the diaphragm caused by over-extraction or under-extraction, including the appearance of wrinkle and bright line; thirdly, by stably controlling the flow rate and concentration of the extractant, the uneven force on the diaphragm caused by the local extractant flow rate being too fast or too slow can be prevented, and its concentration can be ensured to meet the process requirements, which is conducive to maintaining a stable extraction effect and reducing the wrinkle and bright line problems caused by the extractant.

[0098] B. By improving the design of the extraction device, firstly, by designing a multi-stage extraction structure, the diaphragm can gradually adapt to the extraction process at different stages, reducing the stress concentration and wrinkle lines caused by the instantaneous and drastic solvent exchange; secondly, by improving the extractant distribution system, the extractant forms a stable and uniform flow field in the tank, ensuring that the diaphragm is uniformly acted upon by the extractant during the extraction process, thereby reducing the probability of wrinkle lines; thirdly, by adopting a low-stress diaphragm fixing method, it can not only ensure that the diaphragm remains flat during the extraction process, but also reduce scratches and stress concentration caused by hard contact, thereby reducing the occurrence of wrinkle lines.

[0099] C. By introducing post-extraction processing technology, on the one hand, by adopting a gradient drying process, the stress generated in the diaphragm during the post-extraction drying process can be effectively alleviated, and the probability of the occurrence of wrinkle bright lines can be reduced; on the other hand, by performing annealing treatment, the molecular chains inside the diaphragm can be relaxed, and the internal stress generated during the extraction and drying process can be eliminated, further improving the flatness of the diaphragm and reducing the occurrence of bright lines. At the same time, the annealing process can also optimize the microstructure of the diaphragm and improve its comprehensive performance.

[0100] D. By establishing a real-time quality monitoring and feedback control system, firstly, by establishing a real-time quality monitoring and feedback control system, the surface quality of the diaphragm can be monitored in real time; secondly, by establishing a data acquisition and analysis system, accurate prediction and optimal control of the extraction process can be achieved; thirdly, by establishing a closed-loop feedback control system, the process parameters in the extraction process can be automatically adjusted, or deviations in the production process can be corrected in time to ensure that the quality of the produced diaphragm meets the requirements and effectively solve the problem of wrinkle bright lines.

[0101] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for solving the problem of wrinkle bright lines in wet membrane extraction, characterized in that: The following steps are involved: S1. Optimize extraction process parameters; S2. Improve the design of extraction device; S3, introduction of post-extraction processing technology; S4. Establish a real-time quality monitoring and feedback control system; The step S1 includes precise control of the extraction temperature, precise setting of the extraction time and stable control of the flow rate and concentration of the extractant; The step S2 includes designing a multi-stage extraction structure, improving the extractant distribution system and adopting a low-stress diaphragm fixing method; The step S3 includes adopting a gradient drying process and performing an annealing treatment; The step S4 includes establishing an online defect detection system, establishing a data acquisition and analysis system, and establishing a closed-loop feedback control system.

2. A method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The precise control of extraction temperature further includes: S111. Install a high-precision temperature sensor and an intelligent temperature control system in the extraction device to achieve accurate monitoring and real-time adjustment of the extraction temperature; S112, determining the optimal extraction temperature curve corresponding to different diaphragm materials and thicknesses through experiments; S113, using a PID controller to control the fluctuation range of the extraction temperature within a very small range, and strictly follow the optimal extraction temperature curve determined in step S112 during the extraction process.

3. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The precise setting of extraction time further includes: S121, accurately calculating the appropriate extraction time according to the specific specifications of the diaphragm and the properties of the extractant used; S122, using an electronic timer or a time module in a PLC, the extraction time is set to the extraction time calculated in step S121, to ensure that the extraction process is completed within a predetermined time.

4. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The stable control of the flow rate and concentration of the extractant further includes: S131, installing a flow sensor and a concentration monitor in the extraction device to monitor the flow rate and concentration of the extraction agent in real time; S132, by real-time flow monitoring, the flow of the extractant is kept uniform and stable throughout the extraction process to prevent uneven stress on the diaphragm caused by excessively fast or slow flow of the extractant in some places; S133. Through online concentration analysis, timely supplement or adjust the composition of the extractant to ensure that its concentration meets the process requirements in order to maintain a stable extraction effect.

5. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The design of the multi-stage extraction structure specifically includes: S21, designing a multi-stage series-connected extraction unit so that the diaphragm passes through extraction areas with different conditions in sequence; The improvement of the extractant distribution system specifically includes: S22, setting an extractant equalizing device in each extraction tank of the extraction device, and optimizing the internal flow channel design of each extraction tank, so that the extractant forms a stable and uniform flow field in the extraction tank; The low-stress diaphragm fixing method specifically includes: S23, using a flexible fixing fixture or supporting roller with good supporting performance to fix the position of the diaphragm during the extraction process, and designing a diaphragm transmission system with adjustable tension to accurately control its tension during the extraction process according to the material and thickness of the diaphragm.

6. A method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 5, characterized in that: The step S21 further comprises: S211, using a lower concentration of extractant and a slower flow rate in the primary extraction area to gently remove most of the organic solvent in the diaphragm; S212. Gradually increase the concentration and flow rate of the extractant in subsequent extraction areas to achieve more thorough extraction.

7. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The gradient drying process specifically includes: S31, in the drying step after extraction, using a gradient temperature increase drying technology to relieve stress generated during the drying process; The annealing treatment specifically includes: S32, performing a precisely controlled annealing treatment on the dried diaphragm to relax the molecular chains inside the diaphragm and eliminate the internal stress generated during the extraction and drying process.

8. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 7, characterized in that: The gradient temperature increase drying technology in step S31 further includes: S311, firstly perform preliminary drying at a relatively low temperature and a relatively low wind speed, so that the solvent on the surface of the diaphragm evaporates slowly, thereby reducing the surface shrinkage and wrinkles caused by the rapid evaporation of the solvent; S312, as the drying process proceeds, gradually increase the temperature and wind speed to accelerate the diffusion and evaporation of the internal solvent, and finally complete the drying; When performing step S32, a suitable annealing temperature and time are selected according to the material properties of the diaphragm, and the annealing treatment is performed under the protection of an inert gas.

9. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 1, characterized in that: The establishment of an online defect detection system specifically includes: S411. Install advanced optical inspection equipment at key locations of the extraction production line, and use image processing algorithms and intelligent recognition technology to quickly and accurately detect wrinkle bright line defects; S412, feeding back the defect information detected in step S411 to the control system of the extraction process in real time; The establishment of data collection and analysis system specifically includes: S421. Establish a complete data acquisition system to collect various process parameters in the extraction process and the quality data of the diaphragm; S422, using big data analysis technology, deeply mining and analyzing the process parameters in step S421 and the quality data of the diaphragm, establishing a mathematical model between the process parameters and the quality data of the diaphragm, and realizing accurate prediction and optimization control of the extraction process; The establishment of a closed-loop feedback control system specifically includes: S431, combining the online defect detection system, the data acquisition and analysis system and the control system of the extraction process to form a closed-loop feedback control loop; S432. When the online defect detection system detects a wrinkle bright line defect, the control system of the extraction process automatically adjusts the process parameters according to the preset rules, or initiates corresponding corrective measures to promptly correct deviations in the production process to ensure that the quality of the produced diaphragm meets the requirements.

10. The method for solving the problem of wrinkle bright lines in wet membrane extraction according to claim 9, characterized in that: The process parameters of step S421 include temperature, pressure, flow rate, concentration and time; the quality data in step S421 include thickness uniformity, porosity and wrinkle bright line conditions.

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