Process for deeply removing impurities from organic combed cotton raw material by three-step method

Abstract

The invention discloses a three-step deep impurity removal process for an organic combed cotton raw material, and relates to the technical field of organic combed cotton raw material processing. S2, mechanical and chemical synergistic impurity removal; and S3, fine screening and quality detection. According to the invention, pretreatment and preliminary impurity removal are carried out, wind power screening equipment is used for screening the raw materials, large-particle impurities in the raw materials are removed through centrifugal treatment of the equipment, residual tiny impurities are treated through electrostatic adsorption, and the pretreatment and the preliminary impurity removal complement each other, so that the variety range of the removable impurities is greatly widened, and the impurity removal is more comprehensive; the impurity removal efficiency of the whole pretreatment and preliminary impurity removal stage is improved, repeated cooking is not needed, the treatment time consumption can be reduced, and the influence on the fiber strength and hand feeling is reduced, so that the quality and performance of the raw materials are guaranteed, through mechanical and chemical cooperative impurity removal, carded cotton linters are soaked under the low-temperature condition, the impurities can be effectively removed, and the quality of the cotton linters is improved. And the damage to the organic cotton fibers can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of organic combed cotton raw material processing, and specifically to a three-step deep impurity removal process for organic combed cotton raw materials. Background Art

[0002] Organic combed cotton is obtained by subjecting organic cotton to a combing process. The combing process uses a comber to finely comb cotton fibers, removing short fibers, knots, and impurities, and improving the fiber evenness and quality.

[0003] For example, Chinese Patent CN116446208A discloses a production process for high-whiteness refined cotton, which includes the following steps: S1, selecting secondary cotton linter with a cotton fiber length of 3-12 mm and a maturity of 85% or more. The cotton linter raw material is loosened, combed, and decontaminated by an opening machine to obtain a cotton linter raw material with a length of 6-10 mm; S2, placing the cotton linter raw material in a placement dish, spraying a 20 g / L NaOH solution and a surfactant onto the cotton linter in the placement dish to fully moisten the cotton linter. After sufficient spraying, soak for 6-10 min, heat the steaming ball to 100-120 °C and preheat for 6-10 min. After pressing the soaked cotton linter using a press, add it to the steaming ball.

[0004] In the above patent, although the spraying method solves the problem that the dosage of NaOH solution in the cooking process and the bleaching agent in the bleaching process is usually large and easy to cause waste, when processing the combed cotton raw material, multiple cookings take a long time, and excessive cooking will cause the fiber strength to decrease and the hand feel to become hard, affecting the quality and use performance of the product. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-step deep impurity removal process for organic combed cotton raw materials to solve the problem in the above background art that when processing the combed cotton raw material, multiple cookings take a long time, and excessive cooking will cause the fiber strength to decrease and the hand feel to become hard, affecting the quality and use performance of the product.

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

[0007] S1. Pretreatment and preliminary impurity removal: Select organic combed cotton raw materials through appearance feature observation and fiber performance detection. Use a wind screening device to preliminarily screen the organic combed cotton raw materials. After screening, evenly feed the raw materials into a centrifugal separation device for preliminary purification. Remove large particle impurities in the raw materials through centrifugal treatment of the device, and then use an electrostatic adsorption device to remove impurities from the raw materials, and remove residual tiny impurities in the raw materials through electrostatic adsorption treatment;

[0008] S2. Mechanical and chemical collaborative impurity removal: Comb the raw materials processed in S1 through flexible machinery, soak the combed cotton linters in the pre-prepared weak alkaline low-temperature treatment liquid, record the reaction time, rinse and dry the cotton linters after the reaction multiple times to complete secondary impurity removal;

[0009] S3. Fine screening and quality inspection: Send the cotton linters processed in S2 into a vibrating device for screening and grading, collect different cotton linters in different areas according to the screening results, set up an on-line detection system in the whole impurity removal process, use the detection system to control the detection equipment to conduct quality inspection on the cotton linters, obtain the quality parameters of the product, automatically generate a quality report according to the detected quality parameters, and trigger the early warning mechanism of the system when the quality data is abnormal.

[0010] Preferably, in step S1, when performing wind screening, adjust the fan wind speed to 10 - 30 m / s, and the included 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 separation equipment is 1000 - 5000 revolutions per minute, the centrifugation time is 5 - 20 minutes, and the feeding speed is 3 - 5 kilograms per minute.

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

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

[0014] Preferably, in step S2, when performing chemical treatment on the cotton linters, the following steps are further included:

[0015] S21. Preparation of treatment liquid: First, add an appropriate amount of clear water to the reaction kettle, start the stirring device, stir at a speed of 30 - 50 revolutions per minute, slowly add the weighed sodium bicarbonate into the water and continue stirring. After it is completely dissolved, add AES and EDTA-2Na in accordance with the preparation ratio in turn, and continue stirring for 30 - 60 minutes to prepare a weak alkaline low-temperature treatment liquid;

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

[0017] S23. Rinsing treatment: Drain the treatment liquid in the soaking container, squeeze and drain the lint, then inject clean water into the container, turn on the stirring device to fully mix the residual treatment liquid and clean water in the container and the lint, and then drain the rinsing water. Repeat the initial rinsing step 3 - 5 times. Observe the clarity of the drained water during each rinsing until the rinsing is completed, and then dry the lint.

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

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

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

[0021] S31. Quality parameter acquisition: Obtain the quality parameters of the lint at different stages of impurity removal through optical imaging detection, fiber length analysis, and fiber strength detection;

[0022] S32. Establish an early warning mechanism: Set the thresholds of various quality parameters, construct a data acquisition and analysis system, transmit and summarize the data of each on - line detection device in real time, use data analysis software to perform real - time statistics and analysis on the detection data, draw a data change trend chart. Once the data approaches or exceeds the set threshold, the system automatically issues an early warning signal, and automatically adjust the operating parameters of the abnormal device or perform manual intervention according to the early warning signal.

[0023] Preferably, in step S31, when performing quality inspection, use optical imaging technology to detect the surface impurities and color of the lint, use a fiber length analyzer to monitor the change of fiber length, and detect the fiber strength through a strength tester.

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

[0025] 1. In the present invention, through pretreatment and preliminary impurity removal, use a wind screening device to screen the raw materials, combine the centrifugal separation device with the electrostatic adsorption device. Remove large - particle impurities in the raw materials through centrifugal treatment of the device, and then use electrostatic adsorption to treat the remaining tiny impurities, which will not cause additional damage to the fibers. Thus, the risk of damage to cotton fibers is reduced as a whole. The two complement each other, greatly broadening the range of impurity types that can be removed, making the impurity removal more comprehensive, achieving deep impurity removal, improving the impurity removal efficiency in the entire pretreatment and preliminary impurity removal stage, eliminating the need for multiple cookings, reducing the processing time, and reducing the impact on fiber strength and handle, thereby ensuring the quality and performance of the raw materials;

[0026] 2. In the present invention, through the cooperation of mechanical and chemical impurity removal, a flexible carding machine is adopted. The carding needles are soft in material and sparsely arranged, and the rotation speed is relatively low during operation. During the carding process of cotton linter, the carding needles gently card the fibers, untangle the entangled cotton masses, expose the impurities, and the carding force is mild, which can avoid fiber breakage to the greatest extent. After the carded cotton linter is soaked in the prepared weak alkaline low-temperature treatment solution, the soaking process is carried out under low-temperature conditions, which can not only effectively remove impurities, but also reduce the damage to organic cotton fibers, maintain the fiber strength and color. After the treatment is completed, through multiple rinses with clear water and drying, the residual treatment solution and impurities can be removed to ensure the product quality. Detailed implementation manners

[0027] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

[0029] Step 1. Pretreatment and preliminary impurity removal: Select organic combed cotton raw materials through appearance feature penetration and fiber performance detection. Use a wind screening device to preliminarily screen the organic combed cotton raw materials. After screening, evenly feed the raw materials into a centrifugal separation device for preliminary purification. Remove large particle impurities in the raw materials through centrifugal treatment of the device, and then use an electrostatic adsorption device to remove impurities from the raw materials, and remove the remaining tiny impurities in the raw materials through electrostatic adsorption treatment;

[0030] During wind screening, evenly transport the organic combed cotton raw materials into the wind screening device, adjust the fan wind speed to 30 m / s, the included angle between the wind direction and the raw material transport direction is 30°, use the air flow to screen the raw materials, and light impurities such as dust and thin cotton leaf fragments are carried away by the air flow, while the cotton linter falls into the collection device due to its own gravity. Adjust the rotation speed of the centrifugal separation device to 3500 revolutions per minute, the centrifugal time to 10 minutes, the feeding speed to 3 kilograms per minute, the working voltage of the electrostatic adsorption device to 10000 volts, the electric field strength to 2 kV / cm, and the air flow speed to 1.5 m / s;

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

[0032] Step 2: Mechanical and chemical synergistic impurity removal: Comb the raw material treated in Step 1 through a flexible machine, soak the combed cotton linters in a pre-prepared weak alkaline low-temperature treatment solution, record the reaction time, rinse the reacted cotton linters multiple times and dry them to complete secondary impurity removal. The flexible machine is a flexible carding machine with a needle density of 20 needles per square centimeter and a rotation speed generally of 200 revolutions per minute;

[0033] When chemically treating the cotton linters, the following steps are also included:

[0034] 21. Preparation of the treatment solution: Weigh an appropriate amount of sodium bicarbonate as the alkali agent according to the formula. First, add an appropriate amount of clear water to the reaction kettle, turn on the stirring device, stir at a low speed of 40 revolutions per minute, slowly add the weighed sodium bicarbonate into the water and continue stirring. After it is completely dissolved, add AES and EDTA-2Na in sequence according to the preparation ratio, and continue stirring for 45 minutes to fully mix and dissolve all components to prepare a special weak alkaline low-temperature treatment solution;

[0035] 22. Immersion reaction: Evenly place the cotton linters combed by the flexible machine in the immersion container, slowly inject the prepared treatment solution into the immersion container through a pipeline until the treatment solution completely submerges the cotton linters, and control the mass ratio of the treatment solution to the cotton linters at 10:1. Detect the temperature in the current container, then turn on the temperature control structure, and stably control the temperature in the immersion container at 45°C. During the immersion process, stir the treatment solution at a speed of 15 revolutions per minute to make the treatment solution fully contact with the cotton linters and promote the chemical reaction. The stirring process lasts for 6 hours, and regularly observe the changes of the cotton linters during this period;

[0036] 23. Rinsing treatment: After the immersion reaction ends, drain the treatment solution in the immersion container through the drainage pipeline, then inject clear water into the container. The amount of clear water is 7 times the volume of the cotton linters. Turn on the stirring device and stir at a speed of 40 revolutions per minute for 15 minutes to fully mix the residual treatment solution and clear water in the container and the cotton linters. Then drain the rinsing water, repeat the initial rinsing step 5 times, observe the clarity of the drained water each time rinsing until the drained water is basically clear, without obvious impurities and residual treatment solution components, complete the rinsing, and then dry the cotton linters.

[0037] The treatment liquid consists of mild alkalis such as sodium bicarbonate, environmentally friendly surfactants, and chelating agents. The alkalis can undergo chemical reactions with impurities such as cotton wax and pectin, causing them to hydrolyze or saponify. The surfactants reduce the surface tension of the treatment liquid, enhance its penetration and emulsification capabilities, and make it easier for impurities to detach from the fibers. The chelating agents can complex metal ions in water to prevent them from having an adverse impact on the fibers and the treatment effect. The soaking process is carried out under low-temperature conditions, which can not only effectively remove impurities but also reduce damage to the organic cotton fibers, maintaining the fiber strength and color. After the treatment is completed, the residual treatment liquid and impurities are removed through multiple rinses with clean water, and then through drying, the moisture content in the cotton linters can be reduced.

[0038] Step 3: Fine screening and quality inspection: Feed the treated cotton linters from Step 2 into a vibrating device for screening and grading. Collect different cotton linters in different zones according to the screening results. The vibration frequency of the vibrating device is 50 Hz, and the amplitude is 7 mm. By adjusting the vibration frequency and amplitude, the cotton linters are graded and screened according to the fiber length and the residual amount of impurities. The cotton linters with long fibers and few impurities enter the high-quality product collection area; the slightly shorter fibers or those with a small amount of impurities enter the secondary product collection area, accurately controlling the product quality, and further removing the remaining tiny impurities through screening. Set up an on-line detection system in the entire impurity removal process, use the detection system to control the detection equipment to conduct quality inspection on the cotton linters, obtain the quality parameters of the product, automatically generate a quality report based on the detected quality parameters, and trigger the early warning mechanism of the system when the quality data is abnormal.

[0039] When conducting quality inspection, it also includes the following contents:

[0040] 31. Obtaining quality parameters: Use a high-resolution optical camera to take real-time pictures of the cotton linters. Through image recognition algorithms, analyze the impurity distribution on the surface of the cotton linters, calculate indicators such as the area ratio and quantity of impurities, and evaluate whether the residual amount of impurities exceeds the standard. At the same time, analyze the color of the cotton linters, compare it with the standard color sample, and judge whether it meets the quality requirements, such as whether the color is too yellow or too dark, etc., to complete the optical imaging detection;

[0041] Adopt a laser fiber length analyzer to conduct on-line scanning detection of the cotton linter fibers. The device emits a laser beam. According to the scattering and reflection characteristics of the fibers to the laser, accurately measure the fiber length, and statistically analyze the distribution of the fiber length in real time, including parameters such as the average length and the length dispersion coefficient, monitor whether the fiber length is within the specified range, realize fiber length analysis, and prevent the fibers from becoming shorter due to excessive damage during processes such as carding;

[0042] Using a fiber strength tester, a certain number of cotton linter fibers are randomly sampled online for tensile testing. The strength tester applies a gradually increasing tensile force, and records the maximum force value when the fiber breaks. Based on this, the strength index of the fiber is calculated. By continuously monitoring the fiber strength data, the strength change of the fiber during the entire impurity removal process is obtained to determine whether the fiber strength has decreased excessively due to mechanical action or chemical treatment, thus completing the fiber strength detection;

[0043] 32. Establish an early warning mechanism: According to the product quality standards and production process requirements, set the thresholds of various quality parameters for each detection index. For the proportion of impurity area, set the threshold of each quality parameter to 0.5%. When the detection result exceeds this threshold, an early warning is triggered; for the average fiber length and fiber strength, set the lower limit threshold. If it is lower than this value, the early warning is initiated.

[0044] Establish a data collection and analysis system to transmit and summarize the data of each online detection device in real time. Use data analysis software to perform real-time statistics and analysis on the detection data, and draw a data change trend chart. 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 prominent red warning information on the monitoring screen of the production control center and simultaneously emitting sound and light alarms; sending text messages or push notifications to the mobile phones or work terminals of relevant operators to ensure timely receipt of early warning information. When the early warning signal is triggered, locate the abnormal equipment based on the analysis of the abnormal quality data and take improvement measures. The system can automatically perform fine-tuning according to the preset adjustment strategy to correct the factors affecting product quality. At the same time, notify relevant technical personnel to arrive at the scene for manual intervention in a timely manner to check the operation status of the equipment;

[0045] In the pre-treatment and preliminary impurity removal stage, if the optical imaging detection shows that the residual amount of impurities has increased abnormally, and the main impurities are light impurities such as dust and thin cotton leaf fragments, it may be that the fan speed or wind direction parameters of the wind screening equipment are inappropriate. Then, adjust the working parameters of the wind screening equipment. When it is detected that the residual amount of impurities such as tiny metal particles and dust in the cotton linter is abnormal, and the wind screening link is working properly, it may be that the voltage, electric field strength or air flow speed of the electrostatic adsorption equipment is abnormal. The voltage, electric field strength and air flow speed of the electrostatic adsorption equipment can be adjusted;

[0046] In the process of removing impurities from mechanical and chemical systems, if the fiber length analyzer detects that the fiber length is abnormally shortened, or the strength tester detects a significant decrease in fiber strength, it may be that there are problems with the needle arrangement degree and working speed of the flexible carding machine. The working parameters of the flexible carding machine can be adjusted. When it is detected that the color of the cotton linter is abnormally colored, or there are still a large amount of cotton wax, pectin and other impurities, it may be that the temperature control, treatment time or composition ratio of the treatment liquid of the chemical treatment equipment is inappropriate. It is necessary to adjust the reaction temperature, treatment time and treatment liquid ratio, such as extending the treatment time, optimizing the composition ratio of the treatment liquid or accurately re-preparing according to the formula;

[0047] In the process of fine screening and quality inspection, if after vibration screening, the product grading does not meet the expectations, and the cotton linter with long fibers and few impurities enters the secondary product collection area, or the cotton linter with short fibers and many impurities enters the high-quality product collection area, it may be that the vibration frequency and amplitude settings of the vibration screening equipment are incorrect. It is necessary to adjust the vibration frequency and amplitude of the vibration equipment. The vibration frequency can be first reduced by 5-10 Hz, and the amplitude is reduced by 1-2 mm, and the grading effect is observed. If it is not ideal, adjust it step by step until the grading is accurate.

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

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

[0050] Comparative Example 3: The three-step deep impurity removal process of the organic combed cotton raw material provided in this embodiment is roughly the same as that of Example 1. The main difference is that in Step 2, a non-flexible carding machine is used for carding the raw material.

[0051] Test Experiment 1: The cotton linter finished products prepared through Examples 1-3 were respectively recorded as Experimental Example Groups 1-3, and the cotton linter finished products not prepared by the preparation method of the present invention were recorded as Comparative Groups 1-3. The impurity residue amount, average fiber length and fiber strength of the cotton linter finished products were tested, and the relevant data were experimentally recorded in Table 1.

[0052] Table 1: Test Data Record Table

[0053]

[0054] As can be seen from Table 1, without the three-step deep treatment, even after the lint is processed by wind screening and electrostatic adsorption, the residual impurity content is still relatively high. After the three-step deep impurity removal process, the residual impurity content is significantly reduced, and the impurity removal efficiency is improved. In terms of fiber length, a small amount of short fibers are removed during the impurity removal process, resulting in a slight decrease in the average length of the treated lint, but the overall impact is small. After the three-step deep impurity removal, the fiber strength of the lint is improved. The mild treatment method in the impurity removal process can ensure the removal of impurities affecting fiber strength while reducing excessive damage to the fiber structure. Compared with the lint without the three-step deep treatment, the fiber strength increases, so the fiber strength of the lint after treatment can be guaranteed.

[0055] In the present invention: First, adjust the working parameters of the wind screening equipment, and evenly transport the organic combed cotton raw material, that is, lint, into the wind screening device. By adjusting the wind speed and direction of the fan, ensure the screening efficiency of the wind screening equipment, and use the airflow to screen the raw material. The raw material after screening enters the centrifugal separation equipment. The equipment separates impurities with a large density difference from the lint, such as sand grains and small stones, through centrifugal force, reducing the workload of the subsequent electrostatic adsorption device. Use the electrostatic adsorption device to remove tiny charged impurities that are difficult to handle by centrifugal separation through electrostatic adsorption, such as tiny metal particles and some charged dust, to complete the preliminary impurity removal of the raw material. Put the raw material after preliminary impurity removal into a flexible carding machine for carding, and then soak the produced lint in the prepared weak alkaline low-temperature treatment solution. React the lint with the solution under low-temperature conditions, and then perform multiple rinsing treatments after the reaction to remove the residual treatment solution and impurities in the lint;

[0056] Send the lint after rinsing and drying into the vibration equipment for screening, so that the lint is classified and screened according to fiber length and residual impurity content, realizing the zonal collection of the lint. Then, conduct quality inspection on the zoned finished products. Use optical imaging technology to detect the surface impurities and color of the lint, use a fiber length analyzer to monitor the change of fiber length, and detect the fiber strength through a strength tester. Judge the operation of the current impurity removal equipment according to the obtained quality parameters. When no warning is triggered, it is determined that the equipment is operating normally and no adjustment or optimization is required. When a warning is triggered, it is determined that the equipment is operating abnormally. Locate the abnormal equipment through the analysis of the abnormal quality data, and improve and optimize the equipment parameters and process flow through system or manual intervention.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall 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: The following steps are involved: S1. Pretreatment and preliminary impurity removal: organic combed cotton raw materials are selected by observing appearance characteristics and testing fiber properties, and the organic combed cotton raw materials are preliminarily screened by wind screening equipment. After screening, the raw materials are evenly sent to the centrifugal separation equipment for preliminary purification, and the large particles of impurities in the raw materials are removed by centrifugal treatment of the equipment, and then the raw materials are removed by electrostatic adsorption device, and the tiny impurities remaining in the raw materials are treated by electrostatic adsorption; S2, mechanical and chemical synergistic impurity removal: comb the raw materials treated in S1 by a flexible machine, soak the combed cotton linters in a weakly alkaline low-temperature treatment solution prepared in advance, record the reaction time, rinse and dry the reacted cotton linters multiple times, and complete the secondary impurity removal; S3. Fine screening and quality inspection: The cotton linters processed in S2 are sent to the vibration equipment for screening and grading. Different cotton linters are collected in different areas according to the screening results. An online detection system is set up in the whole impurity removal process. The detection system is used to control the detection equipment to perform quality inspection on the cotton linters, and the quality parameters of the products are obtained. A quality report is automatically generated based on the quality parameters obtained by the inspection. 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 wind speed of the fan is adjusted to 10-30 m / 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 rotation speed of the centrifugal separation equipment is 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 working voltage of the electrostatic adsorption device is 5000-15000 volts, the electric field strength is 1-3 kilovolts per centimeter, and the air flow velocity is 0.5-2.0 meters per second.

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 flexible machine is a flexible carding machine, the density of the carding needles is 10-30 per square centimeter, and the rotation speed is generally 100-300 revolutions per minute.

6. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S2, when the cotton linters are chemically treated, the following steps are also included: S21, treatment liquid preparation: first add an appropriate amount of clean water to the reaction kettle, turn on the stirring device, stir at a speed of 30-50 rpm, slowly add the weighed sodium bicarbonate into the water and continue stirring, after it is completely dissolved, add AES and EDTA-2Na in sequence according to the configuration ratio, continue stirring for 30-60 minutes, and prepare a weak alkaline low-temperature treatment liquid; S22, soaking reaction: placing cotton linters in a soaking container, injecting the prepared treatment solution into the soaking container until the treatment solution completely immerses the cotton linters, detecting the temperature in the current container, and then starting the temperature control structure to adjust the temperature in the soaking container. During the soaking process, the treatment solution is continuously stirred for 4-6 hours; S23, rinsing treatment: drain the treatment liquid in the immersion container, squeeze the cotton linters to drain the water, then inject clean water into the container, turn on the stirring device to make the residual treatment liquid in the container and the cotton linters and the clean water fully mixed, then drain the rinsing water, repeat the initial rinsing step 3-5 times, observe the clarity of the discharged water during each rinsing, until the rinsing is completed, and dry the cotton linters.

7. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 6, characterized in that: In step S22, the mass ratio of the treatment liquid to the cotton linters is 8-12:1, and the temperature in the soaking container is 40-50°C.

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 vibration frequency of the vibration device is 10-50 Hz and the amplitude is 3-10 mm.

9. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S3, when performing quality inspection, the following contents are also included: S31. Acquisition of quality parameters: Acquisition of quality parameters of cotton linters at different stages of impurity removal through optical imaging detection, fiber length analysis and fiber strength detection; S32. Establish an early warning mechanism: set thresholds for various quality parameters, build a data collection and analysis system, transmit and summarize the data of each online detection equipment in real time, use data analysis software to conduct real-time statistics and analysis of the detection data, and draw a data change trend chart. Once the data approaches or exceeds the set threshold, the system automatically sends out an early warning signal, and automatically adjusts or manually intervenes the operating parameters of the abnormal equipment based on the early warning signal.

10. The three-step deep impurity removal process for organic combed cotton raw materials according to claim 1, characterized in that: In step S31, when performing 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 meter is used to detect fiber strength.

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