Three-step deep impurity removal process for organic combed cotton raw material

Abstract

The application discloses a three-step deep impurity removal process for organic combed cotton raw materials and relates to the technical field of organic combed cotton raw material processing technology, which comprises the following steps: S1, pretreatment and preliminary impurity removal; S2, mechanical and chemical synergic impurity removal; and S3, fine screening and quality detection. In the application, through pretreatment and preliminary impurity removal, the raw materials are screened by using a wind screening device, large-particle impurities in the raw materials are removed through centrifugal treatment of the device, and residual tiny impurities are removed through electrostatic adsorption treatment, the two are complementary to each other, the type range of the removable impurities is greatly widened, the impurity removal is more comprehensive, the impurity removal efficiency of the whole pretreatment and preliminary impurity removal stage is improved, multiple steaming is not needed, the processing time can be reduced, the influence on the fiber strength and hand feeling is reduced, and thus the quality and performance of the raw materials are ensured. Through mechanical and chemical synergic impurity removal, the combed cotton linters after carding are soaked under low-temperature conditions, impurities can be effectively removed, and the damage to the organic cotton fibers can be reduced.

Description

Technical Field

[0001] This invention relates to the field of organic combed cotton raw material processing technology, specifically a three-step deep impurity removal process for organic combed cotton raw materials. Background Technology

[0002] Organic combed cotton is made from organic cotton through a combing process. The combing process uses a combing machine to finely comb the cotton fibers, removing short fibers, knots, and impurities, thereby improving fiber uniformity and quality.

[0003] For example, Chinese patent CN116446208A discloses a production process for high-whiteness refined cotton, including the following steps: S1, selecting second-class cotton linters with a fiber length of 3-12mm and a maturity of 85% or higher, opening, combing, and removing impurities from the cotton linter raw material using a cotton opener to obtain cotton linter raw material with a length of 6-10mm; S2, placing the cotton linter raw material in a placement dish, spraying 20g / L NaOH solution and surfactant onto the cotton linter in the placement dish to fully wet the cotton linter, soaking it for 6-10 minutes after full spraying, preheating the steaming ball to 100-120℃ for 6-10 minutes, pressing the soaked cotton linter using a press and adding it into the steaming ball.

[0004] Although the above-mentioned patents solve the problem of the large amount of NaOH solution used in the cooking process and the waste caused by the bleaching agent used in the bleaching process by spraying, the multiple cooking times are long when processing combed cotton raw materials. Excessive cooking will reduce fiber strength and harden the hand feel, affecting the quality and performance of the product. Summary of the Invention

[0005] The purpose of this invention is to provide a three-step deep impurity removal process for organic combed cotton raw materials, in order to solve the problems mentioned in the background art, such as the long time required for multiple steaming processes when processing combed cotton raw materials, and the fact that excessive steaming will reduce fiber strength, harden the hand feel, and affect the quality and performance of the product.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a three-step deep impurity removal process for organic combed cotton raw materials, comprising the following steps:

[0007] S1. Pre-treatment and preliminary impurity removal: Organic combed cotton raw materials are selected by observing appearance characteristics and testing fiber performance. The organic combed cotton raw materials are initially screened using wind screening equipment. After screening, the raw materials are evenly fed into centrifugal separation equipment for preliminary purification. Large particle impurities in the raw materials are removed by centrifugation. Then, the raw materials are removed by electrostatic adsorption device to remove residual small impurities in the raw materials.

[0008] S2, Mechanical and Chemical Combined Impurity Removal: The raw materials treated in S1 are combed by flexible machinery, and the combed cotton linters are immersed in a pre-prepared weakly alkaline low-temperature treatment solution. The reaction time is recorded, and the cotton linters after the reaction are rinsed and dried multiple times to complete the secondary impurity removal.

[0009] S3. Fine Screening and Quality Inspection: The cotton linters processed in S2 are sent into a vibrating device for screening and grading. Based on the screening results, different cotton linters are collected in different zones. An online detection system is set up throughout the impurity removal process. The detection system controls the detection equipment to perform quality inspection on the cotton linters, obtain the quality parameters of the product, and automatically generate a quality report based on the obtained quality parameters. When the quality data is abnormal, the system's early warning mechanism is triggered.

[0010] Preferably, in step S1, when performing wind screening, the fan speed is adjusted to 10-30 m / s, and the angle between the wind direction and the raw material conveying direction is 30°-60°.

[0011] Preferably, in step S1, the rotation speed of the centrifugal separator is 1000-5000 rpm, the centrifugation time is 5-20 minutes, and the feeding speed is 3-5 kg ​​per minute.

[0012] Preferably, in step S1, the operating voltage of the electrostatic adsorption device is 5000-15000 volts, the electric field strength is 1-3 kV / cm, and the airflow velocity is 0.5-2.0 m / s.

[0013] Preferably, in step S2, the flexible machine is a flexible carding machine with a carding needle density of 10-30 needles per square centimeter and a rotation speed of 100-300 revolutions per minute.

[0014] Preferably, in step S2, when chemically treating the cotton linters, the following step is also included:

[0015] S21. Preparation of treatment solution: First, add an appropriate amount of water to the reaction vessel, turn on the stirring device, and stir at a speed of 30-50 rpm. Slowly add the weighed sodium bicarbonate to the water and continue stirring. After it is completely dissolved, add AES and EDTA-2Na in sequence according to the configuration ratio, and continue stirring for 30-60 minutes to prepare a weakly alkaline low temperature treatment solution.

[0016] S22, Immersion reaction: Place the cotton linters in an immersion container, pour the prepared treatment solution into the immersion container until the treatment solution completely submerges the cotton linters, detect the current temperature inside the container, then turn on the temperature control structure to adjust the temperature inside the immersion container, and continuously stir the treatment solution for 4-6 hours during the immersion process;

[0017] S23. Rinsing treatment: Drain the treatment solution in the soaking container, squeeze the cotton linters to drain the water, then pour clean water into the container, turn on the stirring device to fully mix the residual treatment solution in the container and the cotton linters with the clean water, then drain the rinsing water, repeat the initial rinsing step 3-5 times, observe the clarity of the drained water each time, until the rinsing is completed, and then dry the cotton linters.

[0018] Preferably, in step S22, the mass ratio of the treatment liquid to the cotton linters is 8-12:1, and the temperature inside the soaking container is 40-50℃.

[0019] Preferably, in step S3, the vibration frequency of the vibrating device is 10-50Hz and the amplitude is 3-10mm.

[0020] Preferably, in step S3, the quality inspection also includes the following:

[0021] S31. Quality parameter acquisition: Quality parameters of cotton linters at different stages of impurity removal are obtained through optical imaging detection, fiber length analysis, and fiber strength detection.

[0022] S32. Establish an early warning mechanism: Set thresholds for various quality parameters, construct a data acquisition and analysis system, transmit and summarize data from various online testing devices in real time, use data analysis software to perform real-time statistics and analysis on the testing data, and draw data change trend charts. Once the data approaches or exceeds the set threshold, the system will automatically issue an early warning signal, and automatically adjust or manually intervene in the operating parameters of abnormal equipment based on the early warning signal.

[0023] Preferably, in step S31, during quality inspection, optical imaging technology is used to detect impurities and color on the surface of cotton linters, a fiber length analyzer is used to monitor changes in fiber length, and a strength tester is used to detect fiber strength.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In this invention, through pretreatment and preliminary impurity removal, the raw materials are screened using a wind-powered screening device, and a centrifugal separation device and an electrostatic adsorption device are used in combination. The equipment removes large particulate impurities from the raw materials through centrifugal treatment, and then uses electrostatic adsorption to treat the remaining small impurities. This does not cause additional damage to the fibers, thereby reducing the overall risk of damage to cotton fibers. The two complement each other, greatly expanding the range of types of impurities that can be removed, making impurity removal more comprehensive, achieving deep impurity removal, and improving the impurity removal efficiency of the entire pretreatment and preliminary impurity removal stage. It eliminates the need for multiple steaming and boiling, reduces processing time, and reduces the impact on fiber strength and hand feel, thereby ensuring the quality and performance of the raw materials.

[0026] 2. In this invention, impurities are removed through a combination of mechanical and chemical methods. A flexible carding machine is used, with soft and sparsely arranged carding needles that operate at a low speed. During the carding process of cotton linters, the carding needles gently comb the fibers, untangling tangled cotton clumps and exposing impurities. The carding force is gentle, minimizing fiber breakage. The carded cotton linters are then soaked in a prepared weakly alkaline low-temperature treatment solution. The soaking process is carried out under low-temperature conditions, which effectively removes impurities while reducing damage to the organic cotton fibers, maintaining fiber strength and color. After treatment, repeated rinsing with clean water and drying remove residual treatment solution and impurities, ensuring product quality. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: A three-step deep impurity removal process for organic combed cotton raw materials, including the following steps:

[0029] Step 1, Pre-treatment and preliminary impurity removal: Organic combed cotton raw materials are selected by appearance characteristics and fiber performance testing. The organic combed cotton raw materials are initially screened using an air screening device. After screening, the raw materials are evenly fed into a centrifugal separation device for preliminary purification. The centrifugal treatment removes large particulate impurities from the raw materials. Then, an electrostatic adsorption device is used to remove impurities from the raw materials, removing residual small impurities.

[0030] During the air screening process, the organic combed cotton raw material is evenly fed into the air screening device. The fan speed is adjusted to 30 m / s, and the angle between the wind direction and the raw material conveying direction is 30°. The airflow is used to screen the raw material. Light impurities such as dust and thin cotton leaf fragments are carried away by the airflow, while short cotton lint falls into the collection device due to its own gravity. The speed of the centrifugal separator is adjusted to 3500 rpm, the centrifugation time is 10 minutes, the feeding speed is 3 kg per minute, the working voltage of the electrostatic adsorption device is 10000 volts, the electric field strength is 2 kV / cm, and the airflow speed is 1.5 m / s.

[0031] When centrifugal separation equipment is used in combination with electrostatic adsorption device, centrifugal separation first removes large particles and high-density impurities, which are usually not effectively treated by electrostatic adsorption. Electrostatic adsorption is responsible for removing tiny charged impurities that are difficult for centrifugal separation to handle. The raw materials are first pre-purified by centrifugal separation, which reduces the total amount of impurities treated by electrostatic adsorption, allowing it to focus more on treating the remaining tiny impurities and improving the efficiency of electrostatic adsorption. The two work together to improve the impurity removal efficiency of the entire pretreatment and preliminary impurity removal stage.

[0032] Step 2, Mechanical and Chemical Combined Impurity Removal: The raw materials treated in Step 1 are combed by flexible machinery. The combed cotton linters are then immersed in a pre-prepared weakly alkaline low-temperature treatment solution. The reaction time is recorded. The cotton linters after the reaction are rinsed and dried multiple times to complete the secondary impurity removal. The flexible machinery is a flexible carding machine with a carding needle density of 20 needles per square centimeter and a rotation speed of 200 revolutions per minute.

[0033] The chemical treatment of cotton linters also includes the following steps:

[0034] 21. Preparation of treatment solution: Accurately weigh an appropriate amount of sodium bicarbonate as an alkaline agent according to the formula. First, add an appropriate amount of water to the reaction vessel, turn on the stirring device, and stir at a low speed of 40 rpm. Slowly add the weighed sodium bicarbonate to the water and continue stirring. After it is completely dissolved, add AES and EDTA-2Na in sequence according to the configuration ratio, and continue stirring for 45 minutes to ensure that all components are fully mixed and homogeneous, thus preparing a special weakly alkaline low-temperature treatment solution.

[0035] 22. Immersion Reaction: The cotton linters, after being gently combed, are evenly placed in an immersion container. The prepared treatment solution is slowly injected into the immersion container through a pipe until the treatment solution completely submerges the cotton linters. The mass ratio of the treatment solution to the cotton linters is controlled at 10:1. The temperature inside the container is monitored, and then the temperature control structure is activated to stabilize the temperature inside the immersion container at 45℃. During the immersion process, the treatment solution is stirred at a speed of 15 rpm to ensure that the treatment solution and the cotton linters are in full contact and to promote the chemical reaction. The stirring process continues for 6 hours, and the changes in the cotton linters are observed regularly during this period.

[0036] 23. Rinsing treatment: After the soaking reaction is completed, drain the treatment solution in the soaking container through the drain pipe, and then pour clean water into the container. The amount of clean water is 7 times the volume of the cotton linters. Turn on the agitator and stir at a speed of 40 rpm for 15 minutes to fully mix the residual treatment solution in the container and the cotton linters with the clean water. Then drain the rinsing water and repeat the initial rinsing step 5 times. Observe the clarity of the drained water each time until the drained water is basically clear and there are no obvious impurities and residual treatment solution components. The rinsing is then completed. Finally, dry the cotton linters.

[0037] The treatment solution consists of a mild alkali such as sodium bicarbonate, an environmentally friendly surfactant, and a chelating agent. The alkali reacts chemically with impurities such as cotton wax and pectin, causing them to hydrolyze or saponify. The surfactant reduces the surface tension of the treatment solution, enhancing its penetration and emulsification capabilities, making it easier for impurities to detach from the fibers. The chelating agent can complex metal ions in the water, preventing them from adversely affecting the fibers and the treatment effect. The soaking process is carried out under low-temperature conditions, which can effectively remove impurities while reducing damage to organic cotton fibers and maintaining fiber strength and color. After treatment, the residual treatment solution and impurities are removed by multiple rinses with clean water, and then dried to reduce the moisture content in the cotton linters.

[0038] Step 3, Fine Screening and Quality Inspection: The cotton linters processed in Step 2 are sent to a vibrating device for screening and grading. Based on the screening results, different sections of cotton linters are collected. The vibration frequency of the vibrating device is 50Hz and the amplitude is 7mm. By adjusting the vibration frequency and amplitude, the cotton linters are graded and screened according to fiber length and residual impurities. Long fibers with fewer impurities enter the high-quality product collection area; slightly shorter fibers or those containing a small amount of impurities enter the secondary product collection area. Product quality is precisely controlled, and residual minute impurities are further removed through screening. An online detection system is set up throughout the impurity removal process. The detection system controls the detection equipment to perform quality inspection on the cotton linters, obtain product quality parameters, and automatically generate a quality report based on the obtained quality parameters. When the quality data is abnormal, the system's early warning mechanism is triggered.

[0039] The following are also included in quality inspection:

[0040] 31. Quality Parameter Acquisition: Using a high-resolution optical camera, real-time images of cotton linters are captured. Through image recognition algorithms, the distribution of impurities on the surface of the cotton linters is analyzed, and indicators such as the area ratio and quantity of impurities are calculated to assess whether the residual amount of impurities exceeds the standard. At the same time, the color of the cotton linters is analyzed and compared with standard color samples to determine whether it meets the quality requirements, such as whether the color is too yellow or too dark, thus completing the optical imaging detection.

[0041] A laser fiber length analyzer is used to scan and detect cotton linters online. The equipment emits a laser beam and accurately measures the fiber length based on the fiber's scattering and reflection characteristics of the laser. It also provides real-time statistics on the distribution of fiber length, including parameters such as average length and length dispersion coefficient. This monitors whether the fiber length is within the specified range, enabling fiber length analysis and preventing excessive fiber damage caused by combing and other processes, which can shorten the fibers.

[0042] Using a fiber strength tester, a certain number of cotton linters are randomly selected online for tensile testing. The tester applies gradually increasing tension and records the maximum force value when the fiber breaks. The fiber strength index is calculated based on this. By continuously monitoring the fiber strength data, the strength change of the fiber during the entire impurity removal process is obtained, and it is determined whether the fiber strength has decreased too much due to mechanical action or chemical treatment, thus completing the fiber strength test.

[0043] 32. Establish an early warning mechanism: Based on product quality standards and production process requirements, set thresholds for various quality parameters for each testing indicator. For the impurity area ratio, set the threshold for each quality parameter to 0.5%. When the test result exceeds this threshold, an early warning is triggered. For the average fiber length and fiber strength, set a lower limit threshold. If the result is lower than this value, an early warning is initiated.

[0044] A data acquisition and analysis system is established to transmit and aggregate data from various online testing devices in real time. Data analysis software is used to perform real-time statistical analysis of the testing data and generate data trend charts. Once the data approaches or exceeds the set threshold, the system automatically issues an early warning signal. The early warning signal can be issued in various ways, such as displaying a conspicuous red warning message on the monitoring screen of the production control center and issuing an audible and visual alarm; sending SMS or push notifications to the mobile phones or work terminals of relevant operators to ensure timely receipt of the early warning information. When the early warning signal is triggered, the abnormal equipment is located based on the analysis of the abnormal quality data, and improvement measures are taken. The system can automatically make fine adjustments according to the preset adjustment strategy to correct factors affecting product quality. At the same time, relevant technical personnel are notified to conduct on-site manual intervention in a timely manner to check the equipment operation.

[0045] If optical imaging shows an abnormal increase in the amount of residual impurities during the pretreatment and initial impurity removal stages, and these impurities are mainly dust, thin cotton leaf fragments, or other light impurities, it may be due to improper fan speed or direction parameters of the wind screening equipment. In this case, the operating parameters of the wind screening equipment should be adjusted. If abnormal residual amounts of small metal particles, dust, or other impurities are detected in the cotton linters, and the wind screening stage is working normally, it may be due to abnormal voltage, electric field strength, or airflow speed of the electrostatic adsorption equipment. In this case, the voltage, electric field strength, and airflow speed of the electrostatic adsorption equipment can be adjusted.

[0046] In the impurity removal process of the mechanical and chemical system, if the fiber length analyzer detects an abnormally shortened fiber length, or the strength tester detects a significant decrease in fiber strength, it may be due to problems with the arrangement of the combing needles and the operating speed of the flexible carding machine. The operating parameters of the flexible carding machine can be adjusted. When abnormal color of cotton linters is detected, or there are still many impurities such as cotton wax and pectin, it may be due to improper temperature control, processing time, or ratio of components in the chemical treatment equipment. The reaction temperature, processing time, and ratio of the treatment solution need to be adjusted, such as extending the processing time, optimizing the ratio of components in the treatment solution, or accurately re-preparing according to the formula.

[0047] In the fine screening and quality inspection process, if the product grading does not meet expectations after vibration screening, with long fibers and few impurities entering the secondary product collection area, or short fibers and many impurities entering the high-quality product collection area, it may be due to an error in the vibration frequency and amplitude settings of the vibration screening equipment. The vibration frequency and amplitude of the vibration equipment need to be adjusted. You can first reduce the vibration frequency by 5-10Hz and the amplitude by 1-2mm, and observe the grading effect. If it is not ideal, adjust it gradually until the grading is accurate.

[0048] Comparative Example 1: The three-step deep impurity removal process for organic combed cotton raw materials provided in this embodiment is roughly the same as that in Example 1. The main difference is that in step one, the raw material pretreatment does not use a wind screening device for preliminary screening.

[0049] Comparative Example 2: The three-step deep impurity removal process for organic combed cotton raw materials provided in this embodiment is roughly the same as that in Example 1. The main difference is that in step one, an electrostatic adsorption device is directly used to remove impurities from the raw materials.

[0050] Comparative Example 3: The three-step deep impurity removal process for organic combed cotton raw materials provided in this embodiment is roughly the same as that in Example 1. The main difference is that a non-flexible carding machine is used when combing the raw materials in step two.

[0051] Test Experiment 1: The cotton linters prepared by Examples 1-3 were designated as Experiment 1-3 groups, and the cotton linters prepared by methods other than those described in this invention were designated as Control 1-3 groups. The residual impurities, average fiber length, and fiber strength of the cotton linters were tested, and the relevant data were recorded in Table 1.

[0052] Table 1: Experimental Data Recording Table

[0053]

[0054] As shown in Table 1, even after wind screening and electrostatic adsorption, the residual impurities in cotton linters remained high without the three-step deep treatment. After the three-step deep impurity removal process, the residual impurities were significantly reduced, improving the impurity removal efficiency. In terms of fiber length, a small number of short fibers were removed during the impurity removal process, causing a slight decrease in the average length of the treated cotton linters, but the overall impact was small. The fiber strength of the cotton linters was improved after the three-step deep impurity removal process. The gentle treatment method in the impurity removal process ensured the removal of impurities that affect fiber strength while reducing excessive damage to the fiber structure. Compared with the cotton linters without the three-step deep treatment, the fiber strength was increased, thus ensuring the fiber strength of the treated cotton linters.

[0055] In this invention: First, the working parameters of the air screening equipment are adjusted to uniformly transport the organic combed cotton raw material, i.e., cotton linters, into the air screening device. By adjusting the fan speed and direction, the screening efficiency of the air screening equipment is ensured. The raw material is screened using airflow. After screening, the raw material enters the centrifugal separation device. The device separates impurities with a large density difference from the cotton linters, such as sand and small stones, from the cotton linters using centrifugal force, reducing the workload of the subsequent electrostatic adsorption device. The electrostatic adsorption device removes tiny charged impurities that are difficult to handle by centrifugal separation, such as tiny metal particles and some charged dust, completing the initial impurity removal of the raw material. The raw material after initial impurity removal is placed in a flexible carding machine for carding. After carding, the resulting cotton linters are soaked in a prepared weakly alkaline low-temperature treatment solution. The cotton linters react with the solution under low-temperature conditions. After the reaction, multiple rinsing processes are performed to remove residual treatment solution and impurities from the cotton linters.

[0056] After rinsing and drying, the cotton linters are fed into a vibrating screen to classify them according to fiber length and residual impurities, achieving zoned collection of the cotton linters. The finished products after zoning are then subjected to quality testing. Optical imaging technology is used to detect surface impurities and color of the cotton linters, a fiber length analyzer is used to monitor changes in fiber length, and a strength meter is used to test fiber strength. Based on the obtained quality parameters, the operation of the current impurity removal equipment is judged. When no warning is triggered, the equipment is considered to be operating normally and no adjustment or optimization is required. When a warning is triggered, the equipment is considered to be operating abnormally. Abnormal quality data is analyzed to locate the abnormal equipment, and the equipment parameters and process flow are improved and optimized through system or manual intervention.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-step deep impurity removal process for organic combed cotton raw materials, characterized by: Includes the following steps: S1. Pre-treatment and preliminary impurity removal: Organic combed cotton raw materials are selected by observing appearance characteristics and testing fiber performance. The organic combed cotton raw materials are initially screened using wind screening equipment. After screening, the raw materials are evenly fed into centrifugal separation equipment for preliminary purification. Large particle impurities in the raw materials are removed by centrifugation. Then, the raw materials are removed by electrostatic adsorption device to remove residual small impurities in the raw materials. S2. Mechanical and chemical synergistic impurity removal: The raw materials treated in S1 are combed by flexible machinery. The combed cotton linters are then immersed in a pre-prepared weakly alkaline low-temperature treatment solution. The reaction time is recorded. The cotton linters after the reaction are rinsed and dried multiple times to complete the secondary impurity removal. The flexible machinery is a flexible carding machine with a carding needle density of 10-30 needles per square centimeter and a rotation speed of 100-300 rpm. S3. Fine Screening and Quality Inspection: The cotton linters processed in S2 are sent into a vibrating device for screening and grading. Based on the screening results, different cotton linters are collected in different zones. An online detection system is set up throughout the impurity removal process. The detection system controls the detection equipment to perform quality inspection on the cotton linters, obtain the quality parameters of the product, and automatically generate a quality report based on the obtained quality parameters. When the quality data is abnormal, the system's early warning mechanism is triggered.

2. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S1, when performing wind screening, the fan speed is adjusted to 10-30m / s, and the angle between the wind direction and the raw material conveying direction is 30°-60°.

3. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S1, the centrifugal separator rotates at 1000-5000 rpm, the centrifugation time is 5-20 minutes, and the feed rate is 3-5 kg ​​per minute.

4. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S1, the operating voltage of the electrostatic adsorption device is 5000-15000 volts, the electric field strength is 1-3 kV / cm, and the airflow velocity is 0.5-2.0 m / s.

5. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S2, the chemical treatment of cotton linters also includes the following steps: S21. Preparation of weakly alkaline low-temperature treatment solution: First, add an appropriate amount of water to the reaction vessel, turn on the stirring device, and stir at a speed of 30-50 rpm. Slowly add the weighed sodium bicarbonate to the water and continue stirring. After it is completely dissolved, add AES and EDTA-2Na in sequence according to the configuration ratio, and continue stirring for 30-60 minutes to prepare a weakly alkaline low-temperature treatment solution. S22, Immersion reaction: Place the cotton linters in an immersion container, pour the prepared weak alkaline low-temperature treatment solution into the immersion container until the weak alkaline low-temperature treatment solution completely submerges the cotton linters, detect the current temperature in the container, then turn on the temperature control structure to adjust the temperature in the immersion container, and continuously stir the weak alkaline low-temperature treatment solution for 4-6 hours during the immersion process. S23. Rinsing treatment: Drain the weakly alkaline low-temperature treatment solution from the soaking container, squeeze the cotton linters to drain the water, then pour clean water into the container, turn on the stirring device to fully mix the residual weakly alkaline low-temperature treatment solution in the container and the cotton linters with the clean water, then drain the rinsing water, repeat the initial rinsing step 3-5 times, observe the clarity of the drained water each time, until the rinsing is completed, and then dry the cotton linters.

6. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 5, characterized in that: In step S22, the mass ratio of the weakly alkaline low-temperature treatment solution to cotton linters is 8-12:1, and the temperature inside the soaking container is 40-50℃.

7. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S3, the vibration frequency of the vibrating device is 10-50Hz and the amplitude is 3-10mm.

8. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S3, the following is also included during quality inspection: S31. Quality parameter acquisition: Quality parameters of cotton linters at different stages of impurity removal are obtained through optical imaging detection, fiber length analysis, and fiber strength detection. S32. Establish an early warning mechanism: Set thresholds for various quality parameters, construct a data acquisition and analysis system, transmit and summarize data from various online testing devices in real time, use data analysis software to perform real-time statistics and analysis on the testing data, and draw data change trend charts. Once the data exceeds the set threshold, the system will automatically issue an early warning signal, and automatically adjust or manually intervene in the operating parameters of abnormal equipment based on the early warning signal.

9. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 8, characterized in that: In step S31, during quality inspection, optical imaging technology is used to detect impurities and color on the surface of cotton linters, a fiber length analyzer is used to monitor changes in fiber length, and a strength tester is used to detect fiber strength.

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