Environment-friendly yarn sizing and dyeing method

Abstract

The invention discloses an environment-friendly yarn sizing and dyeing method. According to the environment-friendly multifunctional starch slurry disclosed by the invention, due to the use of the environment-friendly multifunctional starch slurry, the discharge amount of wastewater is reduced, the content of pollutants in the wastewater is reduced, and the pollution to a water body is reduced. In addition, according to the method, by optimizing process parameters and equipment, the energy utilization efficiency is improved, the energy consumption is reduced, and the carbon emission is further reduced. Meanwhile, resource waste is reduced through recycling of waste materials, cyclic utilization of resources is achieved, and sustainable development of the textile industry is promoted. The cost of the environment-friendly multifunctional starch slurry is low, the production cost can be reduced, and the enterprise competitiveness can be improved. The optimized sizing and dyeing process improves the quality and performance of the yarn, improves the added value of the product, and increases the enterprise income. And in addition, the production efficiency is improved, the production period is shortened, the economic benefits of enterprises are further improved, and important application and popularization value is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of yarn sizing and dyeing, and in particular relates to an environmentally friendly yarn sizing and dyeing method. Background Art

[0002] The yarn sizing and dyeing process is a traditional textile process. Its main function is to size and dye the yarn to improve the strength and wear resistance of the yarn and give the yarn the desired color. This process has a long history and contains rich national wisdom and skills. Yarn sizing is the first step in the sizing and dyeing process, which mainly involves attaching sizing agents such as starch or protein to the surface of the yarn through a specific method. The sizing yarn has good smoothness and stiffness, which is convenient for the subsequent weaving process. Traditional sizing methods include manual sizing and mechanical sizing. The selection and ratio of sizing agents have a vital impact on the quality of the yarn. The dyeing process in the sizing and dyeing process refers to soaking the sizing yarn in the dye solution so that the yarn evenly absorbs the dye. The traditional dyeing process uses natural plant dyes such as madder, hematoxylin, indigo, etc. These dyes are environmentally friendly and have certain medicinal value. During the dyeing process, craftsmen need to master key technologies such as dye ratio, temperature, time, etc. to ensure that the yarn color is full and uniform.

[0003] However, the traditional yarn sizing and dyeing process mainly uses starch as sizing agent, which has some disadvantages: Environmental pollution: Starch sizing agent will produce a lot of wastewater during production and use, and the wastewater contains pollutants such as organic matter and heavy metal ions, which pollute the environment. The film-forming property and wear resistance of starch sizing agent are poor, resulting in insufficient strength and wear resistance of yarn. The cost of starch sizing agent is high, which increases the production cost. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly yarn sizing and dyeing method in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: an environmentally friendly yarn sizing and dyeing method, the method steps comprising the following steps:

[0006] S1: Select appropriate slurry, select environmentally friendly multifunctional starch as the main slurry according to the formula, and select the appropriate ratio of starch and environmentally friendly material according to the count of the yarn;

[0007] S2: Boil the slurry, add starch and environmentally friendly materials into the slurry boiling bucket according to the formula ratio, add appropriate amount of water, and stir evenly; boil the slurry until boiling, maintain the temperature above 95°C, and simmer for 15 minutes to ensure that the slurry is fully gelatinized;

[0008] S3: Adjust the viscosity of the slurry. According to the hairiness of the yarn and the demand for surface slurry, adjust the viscosity of the slurry appropriately; adjust the viscosity by adding an appropriate amount of water or environmentally friendly material;

[0009] S4: performing sizing and dyeing, pouring the cooked slurry into a sizing and dyeing machine, and starting the sizing and dyeing machine to perform sizing and dyeing of the yarn; during the sizing and dyeing process, controlling the temperature and speed of the sizing and dyeing machine to ensure that the slurry is evenly attached to the yarn;

[0010] S5: Washing: After the sizing and dyeing is completed, the yarn is washed to remove excess sizing; warm water is used for washing, and an appropriate amount of detergent is used as needed;

[0011] S6: Drying: Dry the cleaned yarn using a dryer or air drying. During the drying process, control the temperature and humidity to ensure the quality of the yarn.

[0012] S7: Post-processing: according to the purpose and performance requirements of the yarn, necessary post-processing is carried out, such as shaping and softening;

[0013] S8: Wastewater treatment: collect and treat wastewater generated during the dyeing process to ensure that the wastewater meets the discharge standards; use physical, chemical or biological methods to treat wastewater;

[0014] S9: Waste recycling: Recycling the waste generated during the dyeing process, such as collecting the waste using vacuum suction and sweeping, and handing it over to a qualified company for treatment;

[0015] S10: Operate safely. During the sizing and dyeing process, pay attention to personal protection, wear protective gloves and masks; keep the workplace clean to avoid the generation of dust and steam; understand the safety information of environmentally friendly multifunctional starch and take corresponding safety measures;

[0016] S11: Continuously improve, regularly evaluate the environmental performance of the sizing and dyeing process, and make improvements based on the evaluation results; actively explore new environmentally friendly slurries and technologies, and continuously improve the environmental protection level of the sizing and dyeing process.

[0017] In a preferred embodiment, in step S1, a suitable ratio of starch and environmentally friendly material is selected according to the count of the yarn. For yarns with a count of 6S-12S, 25kg of starch and 2kg-8kg of environmentally friendly material are used; for yarns with a count of 10S-12S, 37.5kg of starch and 3kg-12kg of environmentally friendly material are used; for yarns with a count of 21S-32S, 50kg of starch and 5kg-16kg of environmentally friendly material are used; for yarns with a count of 30S-60S, 62.5kg of starch and 10kg-20kg of environmentally friendly material are used;

[0018] Consider the cotton content, abrasion resistance and hairiness of the yarn, and choose the appropriate proportion of environmentally friendly materials; for yarns with high cotton content, the proportion of environmentally friendly materials should be appropriately reduced; for yarns with insufficient abrasion resistance, the proportion of environmentally friendly materials should be appropriately increased; for yarns with longer hairiness, the amount of material added should be appropriately increased.

[0019] In a preferred embodiment, in step S2, starch and environmentally friendly materials are added to a pulp boiling barrel according to the formula ratio, and a proper amount of water is added and stirred evenly; the amount of water is controlled to be about 3-5 times of the pulp;

[0020] After boiling, keep the temperature above 95°C and simmer for 15 minutes. If the temperature is too low, the slurry will not be fully gelatinized, and if the temperature is too high, the slurry will be over-gelatinized, affecting the performance of the slurry.

[0021] During the slurry cooking process, use a stirrer or scraper tool to ensure that the slurry is fully mixed to avoid lumps.

[0022] In a preferred embodiment, in step S3, water is added to reduce the viscosity, and the amount of water added each time is controlled within 5% of the total amount of the slurry to avoid excessive addition at one time resulting in a sudden drop in viscosity;

[0023] Environmentally friendly material addition: Add environmentally friendly materials to increase viscosity. The amount added each time should be controlled within 2% of the total slurry to avoid excessive viscosity caused by excessive addition at one time.

[0024] Temperature control: Temperature will affect the viscosity of the slurry. When the temperature rises, the viscosity will decrease, and when the temperature drops, the viscosity will increase. The viscosity of the slurry can be indirectly controlled by controlling the cooking temperature and the slurry dyeing temperature.

[0025] Stirring: Stirring reduces the viscosity of the slurry. The faster the stirring speed, the lower the viscosity. The viscosity of the slurry can be controlled by adjusting the stirring speed.

[0026] PH value: PH value will affect the viscosity of the slurry. The lower the PH value, the lower the viscosity, and the higher the PH value, the higher the viscosity. The PH value of the slurry can be adjusted by adding acidic or alkaline substances to control the viscosity of the slurry.

[0027] In a preferred embodiment, in step S4, the cooked slurry is poured into a slurry dyeing machine, and the slurry dyeing machine is started to dye the yarn; during the slurry dyeing process, the temperature and speed of the slurry dyeing machine are controlled to ensure that the slurry is evenly attached to the yarn; if the temperature is too low, the slurry will penetrate too quickly, and if the temperature is too high, the slurry will penetrate too slowly;

[0028] The slurry dyeing speed is controlled at about 10-20m / min; too fast speed will cause uneven slurry adhesion, and too slow speed will affect production efficiency.

[0029] In a preferred embodiment, in step S5, after the sizing and dyeing is completed, the yarn is washed to remove excess sizing; warm water is used for washing, and the water temperature is controlled at about 40°C-60°C; too low a temperature will result in poor washing effect, and too high a temperature will result in damage to the yarn;

[0030] Use an appropriate amount of detergent as needed; the detergent removes impurities and excess size on the yarn and improves the cleanliness of the yarn.

[0031] In a preferred embodiment, in step S6, a dryer or natural drying is used; when drying in a dryer, the temperature is controlled at about 80°C-100°C, and the time is controlled at 10-20 minutes; when drying naturally, pay attention to choosing a well-ventilated and sunny place to prevent the yarn from getting damp and moldy.

[0032] In a preferred embodiment, in step S7, the shaping temperature is controlled at about 120°C-160°C, and the time is controlled at 30-60 seconds; during the shaping process, a shaping machine or a hot air furnace is used;

[0033] Softening treatment: Softening treatment improves the feel of the yarn and increases the comfort of the yarn; the softener can be a cationic softener, anionic softener or nonionic softener; the amount of softener used is controlled at 0.5%-2%;

[0034] Waxing treatment: Waxing treatment improves the wear resistance and smoothness of the yarn; the wax material is polyethylene wax, polypropylene wax or paraffin wax; the amount of wax material used is controlled at 0.5%-2%;

[0035] Heat setting: Heat setting further improves the dimensional stability and elasticity of the yarn; the heat setting temperature is controlled at around 150℃-180℃, and the time is controlled at 30-60 seconds.

[0036] In a preferred embodiment, in step S8, suspended solids and heavy metal ions in the wastewater are removed by precipitation; the precipitant is selected from lime, aluminum sulfate or polyacrylamide; and the amount of the precipitant used is controlled at 10-50 mg / L;

[0037] Filtration: Filter to remove fine particles and impurities in wastewater; the filtration equipment can be sand filter, activated carbon filter or ultrafiltration membrane;

[0038] Coagulation: Coagulation removes organic matter and colloids in wastewater; aluminum sulfate, ferric sulfate or polyacrylamide are selected as coagulants; the amount of coagulant used is controlled at 10-50 mg / L;

[0039] Neutralization: Neutralization adjusts the pH value of wastewater to meet the discharge standard; the neutralizing agent is lime, sodium hydroxide or sodium carbonate;

[0040] Aerobic treatment: Aerobic treatment removes organic matter and nitrogen and phosphorus from wastewater; aerobic treatment equipment includes aeration tanks, biological rotary discs or oxidation ditches;

[0041] Anaerobic treatment: Anaerobic treatment removes organic matter and nitrogen and phosphorus from wastewater; anaerobic treatment equipment includes anaerobic digester, UASB reactor or EGSB reactor;

[0042] In the step S9, dust and waste generated during the slurry dyeing process are collected by vacuum cleaning; the vacuum cleaner is a dry vacuum cleaner or a wet vacuum cleaner;

[0043] Sweep up: sweep up and collect the waste generated during the dyeing process; the broom and dustpan should be made of corrosion-resistant and wear-resistant materials;

[0044] Recycling: Waste materials are recycled, for example as fertilizer or fuel; fertilizer is used in agricultural planting, and fuel is burned to generate electricity.

[0045] In a preferred embodiment, in step S10, protective gloves, masks, and goggles are worn to prevent the skin, eyes, and respiratory tract from contacting harmful substances.

[0046] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0047] 1. In the present invention, the use of environmentally friendly multifunctional starch slurry reduces the amount of wastewater discharged, reduces the content of pollutants in the wastewater, and alleviates the pollution to the water body. In addition, the method also improves energy utilization efficiency, reduces energy consumption, and further reduces carbon emissions by optimizing process parameters and equipment. At the same time, the recycling of waste materials also reduces resource waste, realizes the recycling of resources, and promotes the sustainable development of the textile industry.

[0048] 2. In the present invention, the cost of the environmentally friendly multifunctional starch slurry is relatively low, which can reduce production costs and improve corporate competitiveness. The optimized slurry dyeing process improves the quality and performance of the yarn, increases the added value of the product, and increases corporate revenue. In addition, the method also improves production efficiency, shortens the production cycle, and further improves the economic benefits of the enterprise. The environmentally friendly yarn slurry dyeing method has significant advantages in environmental protection, economic benefits, and social benefits, and provides a green, efficient, and low-cost slurry dyeing solution for the textile industry, which has important promotion and application value. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] Example:

[0051] An environmentally friendly yarn sizing and dyeing method comprises the following steps:

[0052] S1: Select the appropriate slurry, select environmentally friendly multifunctional starch as the main slurry according to the formula, and select the appropriate ratio of starch and environmentally friendly material according to the count of the yarn.

[0053] S2: Boil the slurry. Add starch and environmentally friendly materials into the slurry boiling bucket according to the formula ratio, add appropriate amount of water, and stir evenly. Boil the slurry until it boils, keep the temperature above 95℃, and simmer for 15 minutes to ensure that the slurry is fully gelatinized.

[0054] S3: Adjust the viscosity of the slurry. According to the hairiness of the yarn and the demand for surface slurry, adjust the viscosity of the slurry appropriately. The viscosity can be adjusted by adding an appropriate amount of water or environmentally friendly materials.

[0055] S4: Sizing and dyeing, pouring the cooked slurry into the slurry dyeing machine, and starting the slurry dyeing machine to dye the yarn. During the slurry dyeing process, the temperature and speed of the slurry dyeing machine are controlled to ensure that the slurry is evenly attached to the yarn.

[0056] S5: Washing: After the sizing and dyeing is completed, the yarn is washed to remove the excess sizing. Warm water can be used for washing, and an appropriate amount of detergent can be used as needed.

[0057] S6: Drying: Dry the clean yarn. You can use a dryer or dry it naturally. During the drying process, control the temperature and humidity to ensure the quality of the yarn.

[0058] S7: Post-processing: according to the purpose and performance requirements of the yarn, necessary post-processing is carried out, such as shaping, softening, etc.

[0059] S8: Wastewater treatment: collect and treat wastewater generated during the dyeing process to ensure that the wastewater meets the discharge standards. Use physical, chemical or biological methods to treat wastewater.

[0060] S9: Waste recovery: Recycle the waste generated during the dyeing process, such as collecting the waste using vacuum suction and sweeping, and hand it over to a qualified company for treatment.

[0061] S10: Operate safely. During the sizing and dyeing process, pay attention to personal protection, wear protective gloves, masks, etc. Keep the workplace clean and avoid the generation of dust and steam. Understand the safety information of environmentally friendly multifunctional starch and take corresponding safety measures.

[0062] S11: Continuously improve, regularly evaluate the environmental performance of the sizing and dyeing process, and make improvements based on the evaluation results. Actively explore new environmentally friendly sizing materials and technologies, and continuously improve the environmental protection level of the sizing and dyeing process.

[0063] In step S1, a suitable ratio of starch and environmentally friendly materials is selected according to the count of the yarn. For yarns with a count of 6S-12S, 25kg of starch and 2kg-8kg of environmentally friendly materials can be used; for yarns with a count of 10S-12S, 37.5kg of starch and 3kg-12kg of environmentally friendly materials can be used; for yarns with a count of 21S-32S, 50kg of starch and 5kg-16kg of environmentally friendly materials can be used; for yarns with a count of 30S-60S, 62.5kg of starch and 10kg-20kg of environmentally friendly materials can be used.

[0064] Consider the cotton content, abrasion resistance and hairiness of the yarn and choose the appropriate ratio of environmentally friendly materials. For yarns with high cotton content, the ratio of environmentally friendly materials can be appropriately reduced; for yarns with insufficient abrasion resistance, the ratio of environmentally friendly materials can be appropriately increased; for yarns with longer hairiness, the amount of materials can be appropriately increased.

[0065] In step S2, starch and environmentally friendly materials are added into a pulp boiling bucket according to the formula ratio, and an appropriate amount of water is added and stirred evenly. The amount of water is generally controlled to be about 3-5 times of the pulp.

[0066] After boiling, keep the temperature above 95°C and simmer for 15 minutes. Too low a temperature will result in insufficient gelatinization of the slurry, while too high a temperature will result in excessive gelatinization of the slurry, affecting the performance of the slurry.

[0067] During the slurry cooking process, you can use tools such as a stirrer or scraper to ensure that the slurry is fully mixed to avoid clumping.

[0068] In step S3, adding water can reduce the viscosity. The amount of water added each time is controlled within 5% of the total amount of the slurry to avoid excessive addition at one time that causes a sudden drop in viscosity.

[0069] Addition of environmentally friendly materials: Adding environmentally friendly materials can increase the viscosity. The amount added each time should be controlled within 2% of the total slurry to avoid adding too much at one time which will cause excessive viscosity.

[0070] Temperature control: Temperature affects the viscosity of the slurry. When the temperature rises, the viscosity decreases, and when the temperature decreases, the viscosity increases. The viscosity of the slurry can be indirectly controlled by controlling the cooking temperature and the slurry dyeing temperature.

[0071] Stirring: Stirring can reduce the viscosity of the slurry. The faster the stirring speed, the lower the viscosity. The viscosity of the slurry can be controlled by adjusting the stirring speed.

[0072] PH value: PH value will affect the viscosity of the slurry. The lower the PH value, the lower the viscosity, and the higher the PH value, the higher the viscosity. The PH value of the slurry can be adjusted by adding acidic or alkaline substances to control the viscosity of the slurry.

[0073] In step S4, the cooked slurry is poured into a slurry dyeing machine, and the slurry dyeing machine is started to dye the yarn. During the slurry dyeing process, the temperature and speed of the slurry dyeing machine are controlled to ensure that the slurry is evenly attached to the yarn. Too low a temperature will cause the slurry to penetrate too quickly, and too high a temperature will cause the slurry to penetrate too slowly.

[0074] The slurry dyeing speed is generally controlled at about 10-20m / min. Too fast speed will lead to uneven slurry adhesion, and too slow speed will affect production efficiency.

[0075] In step S5, after the sizing and dyeing is completed, the yarn is washed to remove excess sizing. Warm water can be used for washing, and the water temperature is generally controlled at about 40°C-60°C. Too low a temperature will result in poor washing effect, and too high a temperature will cause damage to the yarn.

[0076] According to the needs, an appropriate amount of detergent can be used. The detergent can remove impurities and excess sizing on the yarn and improve the cleanliness of the yarn.

[0077] In step S6, use a dryer or air dry. When drying in a dryer, the temperature is generally controlled at about 80°C-100°C, and the time is generally controlled at 10-20 minutes. When drying naturally, pay attention to choosing a well-ventilated and sunny place to prevent the yarn from getting damp and moldy.

[0078] In step S7, the shaping temperature is generally controlled at about 120° C.-160° C., and the time is generally controlled at 30-60 seconds. During the shaping process, a shaping machine or a hot air furnace or the like can be used.

[0079] Softening treatment: Softening treatment can improve the feel of the yarn and increase the comfort of the yarn. Softeners can be cationic softeners, anionic softeners or non-ionic softeners. The amount of softener used is generally controlled at 0.5%-2%.

[0080] Waxing treatment: Waxing treatment can improve the wear resistance and smoothness of the yarn. The wax material can be polyethylene wax, polypropylene wax or paraffin wax. The amount of wax used is generally controlled at 0.5%-2%.

[0081] Heat setting: Heat setting can further improve the dimensional stability and elasticity of the yarn. The heat setting temperature is generally controlled at around 150℃-180℃, and the time is generally controlled at 30-60 seconds.

[0082] In step S8, precipitation can remove suspended solids and heavy metal ions in the wastewater. The precipitant can be selected from lime, aluminum sulfate or polyacrylamide, etc. The amount of the precipitant used is generally controlled at 10-50 mg / L.

[0083] Filtration: Filtration can remove fine particles and impurities in wastewater. Filtration equipment can be selected from sand filters, activated carbon filters or ultrafiltration membranes.

[0084] Coagulation: Coagulation can remove organic matter and colloids in wastewater. Coagulants can be aluminum sulfate, iron sulfate or polyacrylamide. The amount of coagulant used is generally controlled at 10-50 mg / L.

[0085] Neutralization: Neutralization can adjust the pH value of wastewater to meet the discharge standard. Neutralizers can be selected such as lime, sodium hydroxide or sodium carbonate.

[0086] Aerobic treatment: Aerobic treatment can remove organic matter and nitrogen and phosphorus from wastewater. Aerobic treatment equipment can be selected from aeration tanks, biological rotary discs or oxidation ditches.

[0087] Anaerobic treatment: Anaerobic treatment can remove organic matter and nitrogen and phosphorus from wastewater. Anaerobic treatment equipment can be selected from anaerobic digesters, UASB reactors or EGSB reactors.

[0088] In step S9, vacuum cleaning can collect dust and waste generated during the dyeing process. The vacuum cleaner can be a dry vacuum cleaner or a wet vacuum cleaner.

[0089] Sweep up: Sweep up can collect the waste generated in the process of pulping and dyeing. The broom and dustpan can be made of corrosion-resistant and wear-resistant materials.

[0090] Recycling: Waste can be recycled, for example as fertilizer or fuel. Fertilizer can be used in agricultural planting, and fuel can be burned to generate electricity.

[0091] In step S10, protective gloves, masks, goggles, etc. are worn to prevent the skin, eyes and respiratory tract from contacting harmful substances.

[0092] In the present invention, the use of environmentally friendly multifunctional starch slurry reduces the amount of wastewater discharged, reduces the content of pollutants in the wastewater, and alleviates the pollution to the water body. In addition, the method also improves energy utilization efficiency, reduces energy consumption, and further reduces carbon emissions by optimizing process parameters and equipment. At the same time, the recycling of waste materials also reduces resource waste, realizes the recycling of resources, and promotes the sustainable development of the textile industry.

[0093] In the present invention, the cost of the environmentally friendly multifunctional starch slurry is low, which can reduce production costs and improve the competitiveness of enterprises. The optimized slurry dyeing process improves the quality and performance of the yarn, increases the added value of the product, and increases the profits of the enterprise. In addition, the method also improves production efficiency, shortens the production cycle, and further improves the economic benefits of the enterprise. The environmentally friendly yarn slurry dyeing method has significant advantages in environmental protection, economic benefits and social benefits, provides a green, efficient and low-cost slurry dyeing solution for the textile industry, and has important promotion and application value.

[0094] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0095] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmentally friendly yarn sizing and dyeing method, characterized in that: The method steps include the following steps: S1: Select appropriate slurry, select environmentally friendly multifunctional starch as the main slurry according to the formula, and select the appropriate ratio of starch and environmentally friendly material according to the count of the yarn; S2: Boil the slurry, add starch and environmentally friendly materials into the slurry boiling bucket according to the formula ratio, add appropriate amount of water, and stir evenly; boil the slurry until boiling, maintain the temperature above 95°C, and simmer for 15 minutes to ensure that the slurry is fully gelatinized; S3: Adjust the viscosity of the slurry. According to the hairiness of the yarn and the demand for surface slurry, adjust the viscosity of the slurry appropriately; adjust the viscosity by adding an appropriate amount of water or environmentally friendly material; S4: performing sizing and dyeing, pouring the cooked slurry into a sizing and dyeing machine, and starting the sizing and dyeing machine to perform sizing and dyeing of the yarn; During the sizing and dyeing process, the temperature and speed of the sizing and dyeing machine are controlled to ensure that the sizing material is evenly attached to the yarn; S5: Washing: After the sizing and dyeing is completed, the yarn is washed to remove excess sizing; warm water is used for washing, and an appropriate amount of detergent is used as needed; S6: Drying: Dry the cleaned yarn using a dryer or air drying. During the drying process, control the temperature and humidity to ensure the quality of the yarn. S7: Post-processing: according to the purpose and performance requirements of the yarn, necessary post-processing, shaping and softening are carried out; S8: Wastewater treatment: collect and treat wastewater generated during the dyeing process to ensure that the wastewater meets the discharge standards; use physical, chemical or biological methods to treat wastewater; S9: Waste recycling: waste generated during the dyeing process is recycled by vacuuming and sweeping, and then handed over to a qualified company for treatment; S10: Operate safely. During the dyeing process, pay attention to personal protection, wear protective gloves and masks; keep the workplace clean to avoid the generation of dust and steam; S11: Continuously improve, regularly evaluate the environmental performance of the sizing and dyeing process, and make improvements based on the evaluation results; actively explore new environmentally friendly slurries and technologies, and continuously improve the environmental protection level of the sizing and dyeing process.

2. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In the step S1, a suitable ratio of starch to environmentally friendly material is selected according to the count of the yarn. For yarns with a count of 6S-12S, 25kg of starch and 2kg-8kg of environmentally friendly material are used; for yarns with a count of 10S-12S, 37.5kg of starch and 3kg-12kg of environmentally friendly material are used; for yarns with a count of 21S-32S, 50kg of starch and 5kg-16kg of environmentally friendly material are used; for yarns with a count of 30S-60S, 62.5kg of starch and 10kg-20kg of environmentally friendly material are used.

3. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In the step S2, starch and environmentally friendly materials are added into a pulp boiling bucket according to the formula ratio, and an appropriate amount of water is added and stirred evenly; the amount of water is controlled to be about 3-5 times of the pulp; After boiling the slurry, keep the temperature above 95°C and simmer for 15 minutes; too low a temperature will result in incomplete gelatinization of the slurry.

4. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In the step S3, water is added to reduce the viscosity, and the amount of water added each time is controlled within 5% of the total amount of the slurry; environmentally friendly material addition: environmentally friendly material is added to increase the viscosity, and the amount added each time is controlled within 2% of the total amount of the slurry.

5. The environmentally friendly yarn sizing and dyeing method according to claim 1, characterized in that: In step S4, the slurry dyeing speed is controlled at about 10-20 m / min; too fast a speed will lead to uneven adhesion of the slurry, and too slow a speed will affect production efficiency.

6. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In step S5, after the sizing and dyeing is completed, the yarn is washed to remove excess sizing; warm water is used for washing, and the water temperature is controlled at about 40°C-60°C; too low a temperature will result in poor washing effect, and too high a temperature will result in yarn damage; Use an appropriate amount of detergent as needed; the detergent removes impurities and excess size on the yarn and improves the cleanliness of the yarn.

7. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In step S6, a dryer is used or the mixture is dried naturally; when the mixture is dried in the dryer, the temperature is controlled at about 80° C.-100° C. and the drying time is controlled at 10-20 minutes.

8. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In step S7, the shaping temperature is controlled at about 120°C-160°C, and the time is controlled at 30-60 seconds; during the shaping process, a shaping machine or a hot air furnace is used; Softening treatment: Softening treatment improves the feel of the yarn and increases the comfort of the yarn; the softener can be a cationic softener, anionic softener or nonionic softener; the amount of softener used is controlled at 0.5%-2%; Waxing treatment: Waxing treatment improves the wear resistance and smoothness of the yarn; the wax material is polyethylene wax, polypropylene wax or paraffin wax; the amount of wax material used is controlled at 0.5%-2%; Heat setting: Heat setting further improves the dimensional stability and elasticity of the yarn; the heat setting temperature is controlled at around 150℃-180℃, and the time is controlled at 30-60 seconds.

9. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In step S8, suspended solids and heavy metal ions in the wastewater are removed by precipitation; the precipitant is selected from lime, aluminum sulfate or polyacrylamide; and the amount of the precipitant used is controlled at 10-50 mg / L; Remove fine particles and impurities in wastewater by filtering; the filtering equipment can be sand filter, activated carbon filter or ultrafiltration membrane; Remove organic matter and colloids from wastewater by coagulation; select aluminum sulfate, ferric sulfate or polyacrylamide as coagulant; the amount of coagulant used is controlled at 10-50 mg / L; Adjust the pH value of the wastewater by neutralization to meet the discharge standard; the neutralizer is lime, sodium hydroxide or sodium carbonate; Remove organic matter and nitrogen and phosphorus from wastewater through aerobic treatment; aeration tanks, biological rotary discs or oxidation ditches are selected as aerobic treatment equipment; Remove organic matter and nitrogen and phosphorus from wastewater through anaerobic treatment; anaerobic treatment equipment includes anaerobic digester, UASB reactor or EGSB reactor; In step S9, dust and waste generated in the slurry dyeing process are collected by vacuum cleaning; the vacuum cleaner is a dry vacuum cleaner or a wet vacuum cleaner.

10. An environmentally friendly yarn sizing and dyeing method as claimed in claim 1, characterized in that: In step S10, protective gloves, masks, and goggles are worn to prevent the skin, eyes, and respiratory tract from contacting harmful substances.