How to avoid color difference during the dyeing process of socks

How to avoid color difference during the dyeing process of socks

1. Overview of color difference

1.1 Definition and manifestation of color difference

Color difference refers to the phenomenon that the color of different parts or batches of socks is different due to various factors during the dyeing process of socks. This difference is mainly reflected in three aspects: hue, saturation and brightness. In sock production, color difference can be manifested in various forms:
Color difference in the same batch: In the same batch of socks, there are color differences between socks in different boxes, pieces, packages, pieces or cylinders. For example, in large-scale production, a production batch of socks may have some socks that are darker or lighter in color due to the uniformity of the dyeing equipment.
Color difference in the same piece: In the same piece of socks, there are differences in color between the left, middle and right positions, or the colors of the front and back parts of the socks are inconsistent. This color difference is more common in the production process of socks, especially in the knitting and dyeing of socks, which is easily caused by the unevenness of the equipment or improper operation.
Color difference between the front and back: There is a significant difference in color between the front and back of the socks. This may be due to the incorrect placement of the socks during the dyeing process, or the unreasonable nozzle design of the dyeing equipment, resulting in uneven distribution of dye on the front and back of the socks.

1.2 The impact of color difference on sock quality
The color difference problem has a significant negative impact on the quality and market competitiveness of socks:
Deteriorated appearance quality: Color difference directly affects the appearance quality of socks, making the socks look uneven and unsightly. When consumers buy socks, they usually give priority to products with uniform colors. Socks with obvious color difference may be considered as defective by consumers, thereby reducing the attractiveness of the product.
Reduced customer satisfaction: Color difference problems may lead to reduced customer satisfaction with the product. If the socks purchased by customers have obvious color difference, they may have a negative impression of the brand and even request a return or exchange. This not only increases the cost of the enterprise, but may also damage the reputation of the enterprise.
Increased production costs: In order to avoid color difference problems, enterprises may need to invest more resources in quality control and testing. For example, adding testing equipment, training employees to improve operating skills, etc. In addition, if color difference problems are found, the enterprise may need to re-dye or scrap some products, which undoubtedly increases production costs.
Decreased market competitiveness: In the highly competitive socks market, color difference problems may put companies at a disadvantage in the market. If competitors can provide socks with uniform color and higher quality, consumers are more inclined to choose their products. Therefore, the color difference problem not only affects the short-term economic benefits of the company, but may also have an adverse impact on the long-term development of the company.

2. The impact of raw material factors on color difference

2.1 Quality control of socks grey fabric
The quality of socks grey fabric has a significant impact on the color difference after dyeing. High-quality grey fabric can provide a uniform and consistent basis for the dyeing process, thereby effectively reducing the generation of color difference.
Uniformity of grey fabric: The thickness, density and fiber distribution uniformity of the grey fabric are key factors. If the thickness of the grey fabric is uneven, the thick part may absorb more dye during dyeing, resulting in a darker color, while the thin part is lighter in color. Studies have shown that for every 1% increase in the uniformity error of the grey fabric thickness, the degree of color difference after dyeing may increase by about 0.5%. Therefore, it is crucial to strictly control the production process of the grey fabric to ensure its uniformity.
Fiber quality: Fiber characteristics such as type, length, fineness and strength will also affect the dyeing effect. For example, cotton fiber and nylon fiber have different dyeing properties. Cotton fiber has a weaker affinity for dyes and requires higher temperatures and longer time for dyeing; while nylon fiber has a stronger affinity for dyes and dyes faster. If the fiber quality is unstable, such as fiber damage or impurities, it will affect the penetration and diffusion of the dye, resulting in color difference. In actual production, for every 0.1% increase in the impurity content of the fiber, the degree of color difference after dyeing may increase by about 0.3%.
Pretreatment process: The pretreatment process of grey cloth, such as desizing, bleaching and mercerizing, also has an important impact on the dyeing effect. Incomplete desizing will cause residual sizing on the fiber surface, affecting the adsorption of dyes; uneven bleaching will cause inconsistent base color of grey cloth, affecting the color uniformity after dyeing; mercerizing can improve the surface gloss and hydrophilicity of the fiber and improve the dyeing effect. Data show that the degree of color difference after dyeing can be reduced by about 20% for well-pretreated grey cloth.

2.2 Dye selection and quality inspection
The selection and quality of dyes are important factors affecting the color difference of sock dyeing. Appropriate dyes and strict quality inspection can effectively reduce the occurrence of color difference.
Dye types: Different types of dyes have different chemical properties and dyeing properties. For example, reactive dyes have good brightness and fastness, but have a strong affinity for fibers and are prone to color difference during dyeing; while disperse dyes have a weak affinity for fibers, good dyeing uniformity, but relatively poor brightness and fastness. When selecting dyes, it is necessary to make reasonable choices based on the fiber composition and color requirements of the socks. For example, for cotton socks, reactive dyes are a common choice, but color difference needs to be reduced by optimizing the dyeing process; for Nylon Socks, disperse dyes are more suitable.
Dye quality: The quality of dyes directly affects the dyeing effect. High-quality dyes have stable chemical composition, uniform particle distribution and good solubility. If the dye quality is unstable, such as the presence of particle agglomeration or impurities, it will affect the diffusion and adsorption of the dye, resulting in color difference. In production, for every 1% decrease in dye purity, the degree of color difference after dyeing may increase by about 1%. Therefore, it is necessary to choose a reputable dye supplier and conduct strict quality inspection on each batch of dyes.
Quality inspection methods: The quality inspection of dyes includes chemical composition analysis, particle distribution detection, solubility test, etc. Through these inspection methods, it can be ensured that the quality of dyes meets the production requirements. For example, the chemical composition of dyes can be accurately analyzed by high performance liquid chromatography (HPLC) to ensure its purity and stability; the distribution of dye particles can be detected by laser particle size analyzer to avoid particle agglomeration. In addition, regular small sample tests of dyes to observe their performance in the actual dyeing process are also important means to ensure the quality of dyes.

3. The influence of pre-dyeing treatment on color difference

3.1 Uniformity of desizing and impurity removal
The desizing and impurity removal link before sock dyeing has a direct and important influence on the generation of color difference. The uniformity of desizing and impurity removal determines the surface state of the socks grey fabric, which in turn affects the adsorption and diffusion of dyes.
The influence of uneven desizing: Desizing is the process of removing the sizing on the grey fabric. If the desizing is uneven, the sizing will remain on the fiber surface. The presence of slurry will hinder the contact between dye and fiber, making it impossible for dye to be evenly adsorbed. Studies have shown that for every 0.05 g/m² increase in the amount of residual slurry on the surface of the grey cloth after desizing, the degree of color difference after dyeing may increase by about 0.4%. For example, in large-scale production, if the nozzle of the desizing equipment is blocked or unevenly distributed, it will cause incomplete desizing in some areas, resulting in obvious color difference during dyeing.
The problem of incomplete impurity removal: impurity removal is to remove impurities on the grey cloth, such as cottonseed hulls, oils, etc. These impurities will affect the hydrophilicity of the fiber and the permeability of the dye. If the impurity removal is not thorough, the impurities will adsorb the dye, causing the local color to deepen. Data shows that for every 0.02 g/m² increase in the impurity content on the surface of the grey cloth, the degree of color difference after dyeing may increase by about 0.3%. For example, nylon socks use a large amount of oil in the spinning process. If it is not effectively removed in the pretreatment, it will cause the color of the oil to be darker during dyeing, forming spots.
Optimize the desizing and impurity removal process: In order to improve the uniformity of desizing and impurity removal, advanced desizing equipment and processes can be used. For example, the enzyme desizing technology has a uniform and gentle desizing effect, which can effectively remove the sizing agent without damaging the fiber. At the same time, the impurity removal process is optimized, such as using multiple washing and high-temperature scouring methods to ensure that impurities are completely removed. Through these measures, the degree of color difference after desizing and impurity removal can be reduced by about 15%.

3.2 Consistency of hair effect and whiteness
Hair effect and whiteness are important indicators for measuring the pretreatment effect of socks grey fabric, and their consistency has a significant impact on the color difference after dyeing.
The impact of inconsistent hair effect: Hair effect refers to the water absorption and permeability of fibers. Inconsistent hair effect will lead to different diffusion rates of dyes in fibers. If the dye diffusion rate is slow in the area with low hair effect, the color is likely to be lighter; while the dye diffusion rate is fast in the area with high hair effect, the color may be darker. Studies have shown that for every 1 cm/10 min increase in hair effect difference, the degree of color difference after dyeing may increase by about 0.6%. For example, in the production of cotton socks, if the hair effect control is inconsistent during pretreatment, it will lead to obvious horizontal stripe color difference in socks after dyeing.
The impact of inconsistent whiteness: Whiteness refers to the brightness of the base color of the grey fabric. Inconsistent whiteness will affect the color uniformity after dyeing. If the whiteness of the grey fabric is low, the color after dyeing will be darker; while the color will be brighter in areas with higher whiteness. In addition, inconsistent whiteness will also lead to color deviation. Data show that for every 1% increase in whiteness difference, the degree of color difference after dyeing may increase by about 0.5%. For example, in the production of light-colored socks, inconsistent whiteness will cause more obvious color deviation and affect the overall quality of the product.
Optimize the control of gross effect and whiteness: In order to improve the consistency of gross effect and whiteness, it is necessary to strictly control the pre-treatment process parameters. For example, in the bleaching process, the amount and temperature of the bleaching agent are reasonably controlled to ensure uniform bleaching effect; in the mercerizing process, the concentration and treatment time of the mercerizing liquid are optimized to improve the hydrophilicity and glossiness of the fiber. Through these measures, the degree of color difference caused by inconsistent gross effect and whiteness can be reduced by about 20%.

4. Key control points in the dyeing process

4.1 Accuracy of dye liquor preparation
Dye liquor preparation is a key link in the sock dyeing process, and its accuracy directly affects the dyeing effect and color difference.
Dye weighing accuracy: The dye must be weighed accurately, and the error should be controlled within ±0.5%. Studies have shown that for every 1% increase in the dye weighing error, the degree of color difference after dyeing may increase by about 1.2%. For example, when dyeing dark socks, the amount of dye used is large. If the weighing is inaccurate, it will cause obvious color deviation and affect product quality.
Stability of auxiliary agent addition: Auxiliary agents play an important role in the dyeing process, such as adjusting the pH value of the dye liquor, improving the solubility and dispersibility of the dye, etc. The amount of auxiliary agent added must be stable, and the error should be controlled within ±1%. If the amount of auxiliary agent added is unstable, it will affect the performance of the dye liquor, and then cause color difference. For example, if the amount of pH regulator added is inaccurate, the pH of the dye liquor will change, affecting the adsorption and diffusion of the dye, resulting in uneven color.
Uniformity of dye liquor mixing: After the dye liquor is prepared, it needs to be fully mixed to ensure that the dye and auxiliaries are evenly distributed. Uneven mixing will lead to uneven distribution of dye concentration in the dye liquor, resulting in color difference during the dyeing process. The uniformity of the dye liquor can be ensured by using a stirring device and stirring at a certain speed and time. For example, using a high-speed stirrer and stirring at a speed of 60 r/min for 10 min can make the uniformity of the dye liquor reach more than 95%, effectively reducing the occurrence of color difference.

4.2 Stability of dyeing process parameters
The stability of dyeing process parameters is an important factor in ensuring the quality of sock dyeing, mainly including temperature, time and bath ratio.
Accuracy of temperature control: Dyeing temperature is one of the key parameters affecting the dyeing effect. Temperature fluctuations will cause changes in the adsorption and diffusion rate of the dye, resulting in color difference. During the dyeing process, the temperature control accuracy should reach ±1℃. For example, when dyeing with reactive dyes, the degree of color difference after dyeing may increase by about 0.8% for every 1℃ change in temperature. By using a high-precision temperature control system, such as a PID temperature controller, the stability of the dyeing temperature can be ensured and the occurrence of color difference can be reduced.
Stability of time control: The length of dyeing time will also affect the dyeing effect. If the time is too short, the dye will not be fully adsorbed and the color will be lighter; if the time is too long, the dye may be over-adsorbed and the color will be darker. The control accuracy of dyeing time should reach ±5%. For example, when dyeing with disperse dyes, the color difference after dyeing may increase by about 1% for every 5% change in dyeing time. By optimizing the dyeing process, reasonably determining the dyeing time, and using timing equipment for precise control, the color difference can be effectively reduced.
Rationality of bath ratio control: Bath ratio refers to the weight ratio of dye liquor to sock grey fabric. A reasonable bath ratio can ensure that the dye liquor is in full contact with the fiber and improve the dyeing effect. The control accuracy of bath ratio should reach ±10%. For example, for every 10% change in bath ratio, the color difference after dyeing may increase by about 0.7%. In actual production, the bath ratio should be reasonably determined according to the fiber composition, dye type and dyeing process requirements of the socks, and controlled by precise metering equipment to ensure the stability of the dyeing process.

5. The influence of equipment and operating factors on color difference

5.1 Performance and maintenance of dyeing equipment
The performance and maintenance of dyeing equipment have an important influence on the color difference of sock dyeing. The operating status of the equipment directly determines the uniformity and stability of the dyeing process.
The influence of equipment performance
Temperature control accuracy: The temperature control system of the dyeing equipment is the key to ensure the uniformity of dyeing. A high-precision temperature control system can control the temperature fluctuation within ±1℃. Studies have shown that for every 1℃ increase in temperature fluctuation, the degree of color difference after dyeing may increase by about 0.8%. For example, in the process of reactive dye dyeing, a slight change in temperature will cause different adsorption and diffusion rates of the dye, resulting in color difference.
Stirring uniformity: Good stirring function can ensure that the dye liquor is evenly distributed during the dyeing process. If the stirring is not uniform, the dye concentration in the dye liquor is unevenly distributed, which will cause color differences in different parts of the socks. By using high-efficiency stirring equipment, such as a multi-stage stirring device, the uniformity of stirring can be increased to more than 95%, effectively reducing the generation of color difference.
Equipment sealing: The sealing of the dyeing equipment will also affect the dyeing effect. Good sealing can prevent the dye from evaporating or leaking during the dyeing process, ensuring the stability of the dye concentration and temperature. If the equipment has poor sealing, the concentration of the dye may increase due to evaporation, causing the color to deepen, resulting in color difference.
Importance of equipment maintenance
Regular inspection and maintenance: Regular inspection and maintenance of dyeing equipment is the key to ensuring equipment performance. For example, regular inspection of temperature sensors, stirring devices and sealing parts, and timely replacement of damaged parts can ensure the normal operation of the equipment. Data shows that the color difference of dyeing equipment after regular maintenance can be reduced by about 15%.
Equipment calibration: Regularly calibrate the equipment to ensure the accuracy of its parameters such as temperature, time and bath ratio. For example, calibrating the temperature control system every quarter can ensure that the accuracy of temperature control is within ±1℃, thereby reducing the color difference caused by equipment errors.
Equipment update and upgrade: With the development of technology, timely updating and upgrading of dyeing equipment can improve dyeing quality and efficiency. For example, the use of advanced automated dyeing equipment can achieve more precise temperature control and stirring functions, further reducing the generation of color difference.

5.2 Technical level and standardization of operators
The influence of the technical level and operational standardization of operators on the color difference of sock dyeing cannot be ignored. The experience and skills of operators directly affect the stability and uniformity of the dyeing process.
The influence of technical level
Dye liquor preparation skills: Operators need to have the skills to accurately prepare dye liquor. The weighing accuracy of dyes and auxiliaries should be controlled within ±0.5%, and the stability error of auxiliaries should be controlled within ±1%. Studies have shown that for every 1% increase in dye weighing error, the degree of color difference after dyeing may increase by about 1.2%. Therefore, operators need to undergo rigorous training and master the correct dye liquor preparation method.
Process parameter control ability: Operators need to be proficient in dyeing process parameters, such as temperature, time and bath ratio control. For example, during the dyeing process, the temperature control accuracy should reach ±1°C, the time control accuracy should reach ±5%, and the bath ratio control accuracy should reach ±10%. The experience and skills of operators can ensure the stability of these parameters, thereby reducing the occurrence of color difference.
Equipment operation proficiency: Operators need to be familiar with the operation procedures of dyeing equipment, be able to operate the equipment correctly and find and solve problems in time. For example, operate the stirring equipment skillfully to ensure the uniformity of the dye solution; use the temperature control system correctly to ensure the stability of the dyeing temperature. The proficiency of operators can be improved through regular training and practical operation.
Importance of operation standardization
Standardized operation procedures: Formulating and strictly implementing standardized operation procedures is the key to ensuring dyeing quality. Operators should strictly follow the operating procedures for dye solution preparation, equipment operation and dyeing process control. For example, before dyeing, operators need to check and preheat the equipment to ensure that the equipment is in the best operating state; during the dyeing process, they must strictly follow the process parameters and must not adjust them at will.
Quality monitoring and feedback: Operators need to monitor the quality of the dyeing process and provide timely feedback on problems. For example, during the dyeing process, regular sampling is performed to test the dyeing effect, and timely adjustments are made when problems are found. By establishing a quality monitoring system, color difference problems can be discovered and solved in time to improve product quality.
Continuous training and improvement: Operators are trained regularly to improve their technical level and operation standardization. For example, organize an operation skill training every six months, invite experts to give lectures and guidance, and help operators master the latest dyeing technology and operation specifications. Through continuous training, the overall quality of operators can be improved and the color difference problem caused by human factors can be reduced.

6. The influence of environmental factors on dyeing color difference

6.1 Control of temperature and humidity
The ambient temperature and humidity have a significant impact on the color difference in the sock dyeing process. The temperature and humidity changes in the dyeing workshop will directly affect the stability of the dye liquor, the hygroscopicity of the fiber and the adsorption performance of the dye.
The influence of temperature: The temperature fluctuation in the dyeing workshop will cause the physical properties of the dye liquor to change. For example, the increase in temperature will reduce the viscosity of the dye liquor, accelerate the diffusion rate of the dye, and may cause the color to be lighter; the decrease in temperature will increase the viscosity of the dye liquor, slow down the diffusion rate of the dye, and the color may be darker. Studies have shown that for every 1°C change in workshop temperature, the degree of color difference after dyeing may increase by about 0.5%. Therefore, the temperature of the dyeing workshop should be strictly controlled between 20°C and 25°C to ensure the stability of the dyeing process.
The influence of humidity: Changes in humidity will affect the hygroscopicity of the fiber, and then affect the adsorption and diffusion of the dye. In a high humidity environment, the fiber's hygroscopicity increases, and the amount of dye adsorbed may decrease, resulting in a lighter color; while in a low humidity environment, the fiber's hygroscopicity decreases, the amount of dye adsorbed increases, and the color may be darker. Data show that for every 5% change in workshop humidity, the degree of color difference after dyeing may increase by about 0.3%. The humidity in the dyeing workshop should be controlled between 50% and 60% to ensure the consistency of the dyeing effect.
Temperature and humidity control measures: In order to ensure the stability of the temperature and humidity in the dyeing workshop, the following measures can be taken:
Install air conditioning systems and dehumidification equipment to monitor the temperature and humidity of the workshop in real time and adjust them as needed.
Set up temperature and humidity sensors in the workshop, record data regularly, and ensure that the temperature and humidity are controlled within the set range.
Reduce the impact of the external environment on the temperature and humidity of the workshop by optimizing the layout of the workshop, such as avoiding frequent opening and closing of workshop doors and windows to reduce the entry of outside air.

6.2 Consistency of light source conditions
Light source conditions have an important impact on the color observation and evaluation of socks after dyeing. Different light sources will result in different visual effects of sock colors, thereby affecting the judgment of color difference.
Influence of light source type: Common light sources include natural light, fluorescent lamps, and incandescent lamps. Natural light has a wide spectrum range and good color reproduction, but is greatly affected by weather and time; the spectrum of fluorescent lamps is mainly concentrated in the blue and green light areas, and the reproduction of certain colors is poor; the spectrum of incandescent lamps is reddish, which makes the colors look warmer. Studies have shown that the color difference of the same socks under different light sources may differ by more than 10%. Therefore, during the dyeing process and quality inspection, standard light sources such as D65 light sources (simulating natural daylight) should be used as much as possible to ensure the consistency of color evaluation.
Influence of light source intensity: Changes in light source intensity will also affect the visual effect of color. Stronger light sources make colors look brighter, while weaker light sources make colors appear dimmer. Data show that for every 10% change in light source intensity, the color brightness of dyed socks may change by about 5%. In the dyeing workshop and quality inspection area, the light source intensity should be ensured to be stable and meet standard requirements. It is generally recommended that the light source intensity be between 700 lx and 1000 lx.
Light source consistency control measures: In order to ensure the consistency of light source conditions, the following measures can be taken:
Install standard light source light boxes in the dyeing workshop and quality inspection area to ensure color evaluation under uniform light source conditions.
Calibrate light source equipment regularly to ensure that its spectral characteristics and intensity meet standard requirements.
During the production process, avoid using different types of light sources for mixed lighting to avoid affecting color observation and judgment.

7. Quality inspection and feedback mechanism

7.1 Online inspection and instant adjustment
In the process of sock dyeing, establishing an effective online inspection and instant adjustment mechanism is the key link to avoid color difference problems. By real-time monitoring of various indicators in the dyeing process, timely discovery and solution of problems can significantly improve the dyeing quality.
Application of online inspection technology: Using advanced online inspection equipment, such as spectrometers and colorimeter, the color changes of socks during the dyeing process can be monitored in real time. The spectrometer can accurately measure the spectral reflectance of dyeing liquid and socks, so as to accurately judge the color deviation. Studies have shown that the measurement accuracy of online inspection using a spectrometer can reach ±0.1%, which can detect small color difference changes in time. The colorimeter can directly measure the color difference between the color of the socks and the standard color sample, providing intuitive numerical feedback. Through these devices, operators can obtain color data in real time during the dyeing process and adjust the dyeing process parameters in time.
Immediate adjustment measures: Once the online detection system finds color deviation, the operator needs to take adjustment measures quickly. For example, if the color is found to be lighter, the amount of dye can be appropriately increased; if the color is darker, it can be improved by adjusting the temperature, time or adding an appropriate amount of leveling agent. In addition, the operating parameters of the dyeing equipment can be optimized, such as adjusting the stirring speed and frequency, to ensure the uniform distribution of the dye liquor. The effectiveness of the immediate adjustment measures depends on the experience and technical level of the operator. Therefore, regular training of operators to familiarize them with the operation and adjustment methods of online detection equipment is an important guarantee for the successful implementation of immediate adjustment measures.
Data recording and analysis: The data generated during the online detection process should be recorded and analyzed in detail. By establishing a database, the color data, process parameters and adjustment measures of each dyeing process are stored and analyzed, and the laws and trends of the dyeing process can be summarized. These data not only help to optimize the dyeing process, but also provide a reference for subsequent quality control. For example, through the analysis of historical data, it can be found that some batches of socks are prone to color difference problems under specific dyeing conditions, so that preventive measures can be taken in advance to avoid similar problems from happening again.

7.2 Finished product sampling and problem tracing
Finished product sampling is the last line of defense to ensure the quality of sock dyeing. By regularly sampling finished products, color difference problems can be discovered in time, the root cause of the problem can be traced, and effective improvement measures can be taken.
Finished product sampling method: Finished product sampling should be carried out in accordance with a scientific and reasonable sampling plan. According to the production batch and quantity, determine the appropriate sampling ratio. It is usually recommended that the sampling ratio should not be less than 5%. When sampling, samples should be randomly selected from socks of different batches, different production dates and different production links to ensure the representativeness and comprehensiveness of the samples. The sampling content includes indicators such as color consistency, color fastness, and appearance quality, among which color consistency is the key detection item. Use a standard light source light box and a colorimeter to measure and evaluate the color of the finished socks, and compare them with the standard color sample to determine whether there is a color difference problem.
Problem tracing and cause analysis: Once a color difference problem is found in the finished product sampling, the problem tracing procedure should be started immediately. By consulting production records, process parameters, raw material inspection reports and online inspection data, the root cause of the problem can be gradually traced. Possible causes include raw material quality problems, fluctuations in dyeing process parameters, equipment failures, operator errors, etc. For example, if a batch of socks is found to have a large color difference, it is found through tracing that the batch of dyes used in the batch is different and the purity of the dyes is different. This is the main reason for the color difference problem. Through in-depth analysis of the problem, the responsible department and person in charge can be identified to provide a basis for subsequent improvement measures.
Improvement measures and continuous improvement: According to the results of problem tracing, targeted improvement measures should be formulated. If it is a raw material quality problem, the inspection and acceptance of raw materials should be strengthened, and qualified suppliers should be replaced; if the color difference is caused by fluctuations in process parameters, the process parameter control process should be optimized to improve the stability of process parameters. In addition, a continuous improvement mechanism should be established to summarize and analyze the results of each finished product sampling and problem tracing, and continuously optimize the production process and quality control system. For example, we hold regular quality analysis meetings to discuss the causes of quality problems and improvement measures, form quality improvement reports, and implement them in the production process. Through continuous improvement, we can gradually improve the quality and stability of sock dyeing and reduce the occurrence of color difference problems.