Dyeing system and method for improving color fastness of fabric

Abstract

The invention relates to the technical field of textile printing and dyeing, and discloses a dyeing system and method for improving fabric color fastness, the system comprises a flooding washing device, a heat setting device, a color fixing agent applying device and a humidity adjusting and setting device which are sequentially arranged along the fabric conveying direction, and is equipped with a central control device, the flooding cleaning device removes unfixed dye on the surface of the fabric by using a circulating filtering assembly; the heat setting device accurately adjusts the temperature in a heating box body through a central control device, and performs high-temperature setting on the fabric to eliminate internal stress; the color fixing agent applying device is used for uniformly applying a color fixing agent to the shaped fabric; the humidity adjusting and shaping device enables the fabric to complete moisture absorption balance and final shaping by controlling the relative humidity in the closed chamber. Through the synergistic effect of physical cleaning, high-temperature setting, chemical fixation and humidifying treatment, the problems of cloth wrinkles caused by low-temperature setting and insufficient color fastness in an extreme environment in the prior art are solved, and the dimensional stability and dyeing quality of the fabric are improved.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology, specifically to a dyeing system and method for improving the color fastness of fabrics. Background Technology

[0002] In the modern textile printing and dyeing industry, especially in the menswear sector where the texture and appearance of fabrics are extremely important, the post-dyeing processing is a crucial step in determining the quality of the finished product. As consumers' demands for clothing quality increase, fabrics not only need to have rich colors but also must maintain excellent colorfastness and smoothness under various environmental conditions. Currently, the mainstream dyeing post-processing technology in the industry typically includes two main steps: wash and setting. Washing aims to remove unfixed dyes adsorbed on the fiber surface through water washing, while the setting process often employs low-temperature setting technology to maintain the physical shape of the fabric without damaging the fibers.

[0003] However, existing dyeing post-treatment technologies still have significant limitations in practical applications, making it difficult to simultaneously achieve both colorfastness and fabric surface quality. Specifically, traditional post-treatment processes lack precise control over the color-fixing environment and fiber internal stress. This leads to dye molecules migrating or desorbing when the fabric faces extreme environments such as high temperature or high humidity, resulting in color fading or staining, failing to meet the stringent weather resistance requirements of high-quality menswear. Furthermore, to avoid damage to specific fibers from high temperatures, the low-temperature setting methods commonly used in existing technologies often fail to provide sufficient heat energy to fully eliminate the internal stress generated during dyeing. This incomplete heat setting directly results in wrinkles or unevenness on the fabric surface, severely affecting subsequent cutting and processing efficiency and the aesthetics of the finished garment.

[0004] Therefore, the purpose of this invention is to provide a dyeing system and method for improving the color fastness of fabrics, so as to overcome the shortcomings of the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a dyeing system and method to improve the color fastness of fabrics. Existing textile dyeing post-treatment technologies suffer from problems such as incomplete low-temperature setting leading to wrinkles on the fabric surface, insufficient color fastness and easy fading under high temperature and high humidity environments.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a dyeing system for improving the color fastness of fabrics, comprising a floating color washing device, a heat setting device, a color fixing agent application device, and a moisture conditioning and setting device arranged sequentially and interconnected along the fabric conveying direction.

[0007] The floating dye cleaning device is configured to receive the dyed fabric and remove unfixed dye from the surface. The heat setting device is provided with a floating dye cleaning device on one side for heat setting the cleaned fabric. The fixing agent application device is provided with a heat setting device on one side for applying fixing agent to the set fabric. The humidity setting device is provided with a fixing agent application device on one side for providing a controlled humidity environment for the fabric to complete the final setting.

[0008] The dyeing system also includes a central control device, which is electrically connected to the heat setting device and the humidity setting device, and is configured to control the heating temperature of the heat setting device and the internal humidity of the humidity setting device.

[0009] Preferably, the floating color cleaning device includes a cleaning tank for containing cleaning liquid and the fabric passing through it, a spray assembly disposed inside the cleaning tank for spraying cleaning liquid onto the fabric, and a circulating filtration assembly consisting of a circulating pump and a filter.

[0010] The input end of the circulating pump is connected to the bottom of the cleaning tank, and the output end is connected to the spray assembly via the filter to form a circulating loop for the cleaning liquid.

[0011] Preferably, the heat setting device includes a heating chamber with an internal heating channel through which the fabric passes, a heating component is provided inside the heating chamber, and a temperature sensor for detecting the setting temperature is also provided inside the heating chamber.

[0012] The central control unit is configured to control the heating assembly based on the feedback signal from the temperature sensor to maintain the temperature inside the heating chamber within a preset temperature range.

[0013] Preferably, the interior of the heating chamber is divided into multiple independent temperature control sections, and each of the multiple temperature control sections is independently equipped with a heating component and a temperature sensor;

[0014] The central control unit is configured to independently control the temperature of each of the temperature control zones.

[0015] Preferably, the fixing agent application device specifically includes a storage tank disposed on one side of the fabric conveying path for containing a cationic fixing agent and an application component disposed on the fabric conveying path for the fabric to pass through. The storage tank and the application component are interconnected by a pipeline, and a metering pump is disposed on the pipeline for extracting the fixing agent in the storage tank and delivering it to the application component. The application component includes an impregnation tank or an atomizing nozzle.

[0016] Preferably, the humidity conditioning and shaping device includes a sealed processing chamber with a sealed structure at the inlet and outlet, a dehumidification component connected to the sealed processing chamber for reducing indoor air humidity, and a humidity sensor for detecting the relative humidity of the environment is provided in the sealed processing chamber.

[0017] The central control unit is configured to control the dehumidification assembly to maintain the relative humidity in the sealed processing room within a preset range based on the feedback signal from the humidity sensor.

[0018] Preferably, the moisture conditioning and shaping device is further provided with a multi-layer guide roller group, which is configured to guide the fabric to reciprocate and meander within the sealed processing chamber to increase the dwell time.

[0019] Preferably, the dyeing system further includes a feed tension control device disposed on the other side of the floating dye washing device for controlling the tension of the fabric entering the system, and a fabric conveying mechanism that passes through the floating dye washing device, the heat setting device, the fixing agent application device and the moisture conditioning setting device for continuously conveying the fabric.

[0020] Preferably, the dyeing system further includes a dyeing machine disposed on the other side of the floating dye cleaning device, the dyeing machine being configured to dye the fabric before it enters the floating dye cleaning device.

[0021] This invention also provides a dyeing method for improving the color fastness of fabrics, comprising the following steps:

[0022] S1. Dyeing process: Place the fabric to be treated in a stainless steel dyeing machine with a capacity of 400L to 600L and dye it according to the preset dyeing process conditions.

[0023] S2, Floating Dye Cleaning Step: The dyed fabric is transported to the cleaning tank of the polyethylene floating dye cleaning device. The circulation pump is started to circulate the cleaning solution using the circulation filtration system. The fabric is continuously circulated and cleaned for 15 to 25 minutes to remove the floating dye on the surface.

[0024] S3. Precise heat setting step: After washing, the fabric enters the heat setting device. The heating components are controlled by the central control device to adjust and maintain the temperature in the heating chamber within the range of 110℃ to 120℃ to set the fabric, and the temperature control accuracy is ±1℃.

[0025] S4, Fixing agent impregnation step: The heat-set fabric is treated with a fixing agent by applying a cationic fixing agent to the fabric through a fixing agent application device;

[0026] S5. Conditioning and Setting Step: The fabric after applying the color-fixing agent is transported to the conditioning and setting device. The dehumidification component is controlled by the central control device to maintain the relative humidity of the sealed processing room within the range of 40% to 50%, and the fabric is continuously processed in this humidity environment for 20 to 30 minutes to complete the final setting.

[0027] In summary, the present invention has at least one of the following beneficial technical effects:

[0028] 1. This invention utilizes a central control device to strictly maintain the temperature within the heat setting device within a preset high-temperature range to precisely eliminate internal fiber stress. Subsequently, in the sealed processing chamber of the humidity setting device, the relative humidity is controlled within a specific suitable range by a dehumidification component, and the residence time of the fabric in the processing chamber is extended by a multi-layer guide roller assembly. This solves the problems of static electricity and rough hand feel caused by excessive drying of the fabric after chemical fixation, ensuring that the fibers complete moisture absorption balance under the premise of physical stability.

[0029] 2. The floating dye cleaning device of the present invention adopts a high-flow-rate circulating filter component. While using powerful physical flushing to remove unfixed dyes from the fabric surface, it realizes the recycling of cleaning liquid and reduces water consumption. The fixing agent application device, through the structure of metering pump connected to pipeline, can accurately control the liquid rate of cationic fixing agent within a preset range according to the fabric condition, avoiding excessive waste or uneven distribution of fixing agent in traditional padding methods, and ensuring the uniformity of fixing reaction.

[0030] 3. In response to the corrosion and temperature environments of different processes, the system uses high-temperature resistant stainless steel for the pre-dyeing machine and polyethylene for the post-treatment cleaning tank. This effectively reduces the overall manufacturing cost of the equipment while meeting the specific corrosion resistance and temperature resistance requirements of each process. In addition, the design of placing the fixing agent storage tank on one side of the conveying path and supplying it to the application component through pipelines allows the replenishment of chemical reagents and the maintenance of the storage unit to be carried out independently of the fabric conveying line, avoiding interference with the continuity of production. Attached Figure Description

[0031] Figure 1 This is a schematic diagram on the right side of the present invention;

[0032] Figure 2 This is a schematic diagram of the left side of the present invention;

[0033] Figure 3 This is a schematic diagram of the device structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the humidity conditioning and shaping device of the present invention.

[0035] Among them, 10. Dyeing machine; 20. Floating dye cleaning device; 21. Cleaning tank; 22. Spray assembly; 23. Circulating pump; 24. Filter; 30. Heat setting device; 31. Heating chamber; 32. Temperature control zone; 33. Heating assembly; 34. Temperature sensor; 40. Fixing agent application device; 41. Storage tank; 42. Application assembly; 43. Metering pump; 50. Humidity conditioning and setting device; 51. Sealed treatment chamber; 52. Dehumidification assembly; 53. Humidity sensor; 54. Guide roller assembly; 60. Central control device. Detailed Implementation

[0036] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a dyeing system and method for improving the color fastness of fabrics, comprising a floating dye cleaning device 20, a heat setting device 30, a fixing agent application device 40, and a humidity setting device 50 arranged sequentially and interconnected along the fabric conveying direction; wherein the floating dye cleaning device 20 is configured to receive the dyed fabric and remove unfixed dye from the surface, the heat setting device 30 is provided on one side for heating and setting the cleaned fabric, the fixing agent application device 40 is provided on one side for applying fixing agent to the set fabric, and the humidity setting device 50 is provided on one side for providing a controlled humidity environment for the fabric to complete the final setting; the dyeing system also includes a central control device 60, which is electrically connected to the heat setting device 30 and the humidity setting device 50 respectively, and is configured to control the heating temperature of the heat setting device 30 and the internal humidity of the humidity setting device 50;

[0037] Specifically, the floating dye cleaning device 20 is located at the system inlet and is equipped with a fluid circulation structure to receive fabric from the previous process and remove unfixed dye particles from the fabric surface using physical rinsing. The heat setting device 30 is located on one side of the floating dye cleaning device 20 along the fabric conveying direction, and its interior defines a heating cavity for high-temperature heat setting of the cleaned wet fabric. The fixing agent application device 40 is located on one side of the heat setting device 30 along the fabric conveying direction and is used to uniformly coat the set fabric surface with chemical auxiliaries. The humidity conditioning setting device 50 is located on one side of the fixing agent application device 40 along the fabric conveying direction and is used to create a constant humidity, sealed environment in which the fabric completes moisture absorption equilibrium and final setting. In addition, the dyeing system also integrates a central control device 60. The central control device 60 is electrically connected to the power controller of the heat setting device 30 and the environmental control device of the humidity conditioning setting device 50 via shielded cables or an industrial bus. The central control unit 60 stores a control algorithm and is configured to adjust the heating temperature output value of the heat setting device 30 and the relative humidity value inside the humidity setting device 50 in real time based on the data fed back by the sensors, so as to maintain the preset process environment.

[0038] The floating dye cleaning device 20 includes a cleaning tank 21 for containing cleaning liquid and the fabric being cleaned, a spray assembly 22 disposed inside the cleaning tank 21 for spraying cleaning liquid onto the fabric, and a circulating filter assembly consisting of a circulating pump 23 and a filter 24; wherein the input end of the circulating pump 23 is connected to the bottom of the cleaning tank 21, and the output end is connected to the spray assembly 22 via the filter 24 to form a circulating loop for the cleaning liquid.

[0039] Specifically, the main structure of the floating dye cleaning device 20 includes a cleaning tank 21. The cleaning tank 21 is an open or semi-closed container used to hold water-based cleaning solution and to allow the fabric to be immersed or passed through. A spray assembly 22 is installed inside the cleaning tank 21, comprising multiple sets of opposing high-pressure nozzles directed towards the fabric's conveying path. The device also includes a circulating filter assembly, consisting of a circulating pump 23 and a filter 24. The input port of the circulating pump 23 is connected via a pipeline to the bottom collection area of ​​the cleaning tank 21, and the output port of the circulating pump 23 is connected to the inlet of the filter 24. The outlet of the filter 24 is connected via a pipeline to the spray assembly 22. During operation, the circulating pump 23 is configured to operate at a flow rate of 10 m³ / min. 3 Cleaning fluid is continuously drawn from the bottom of the tank at a flow rate of 15 m³ / h to 15 m³ / h. After passing through filter 24 to remove fiber debris and solid dye particles, the cleaning fluid is pressurized and sprayed onto the fabric surface by spray assembly 22. The sprayed liquid flows back to the bottom of the cleaning tank 21 under gravity, forming a closed-loop fluid circulation. This structure physically removes loose dye from the fabric surface through high-flow-rate rinsing.

[0040] In this embodiment, the water-based cleaning solution can be industrial soft water, a soaping solution with added nonionic surfactants, or a special anti-staining cleaning agent formulated for specific dyes (such as reactive dyes). Considering that the main purpose of floating color cleaning is to remove unfixed dye particles through the physical flushing of a large flow of liquid, rather than to carry out a high-temperature chemical reaction, the temperature of the cleaning solution in this step is usually controlled in the range of 30°C to 70°C (preferably 40°C-60°C).

[0041] Based on the chemical properties of the cleaning solution (typically weakly acidic, neutral, or weakly alkaline) and its temperature range, this embodiment preferably uses polyethylene (PE) to prepare the cleaning tank 21. Polyethylene has excellent chemical inertness, effectively resisting corrosion from various textile auxiliaries and residual acids and alkalis, preventing the tank from rusting and contaminating the fabric. Simultaneously, high-density polyethylene (HDPE) typically has a Vicat softening point above 120°C and a long-term heat resistance temperature of around 80°C, fully meeting the temperature requirements of the floating color cleaning process in this embodiment. Furthermore, compared to stainless steel, PE offers superior cost advantages and thermal insulation performance.

[0042] The heat setting device 30 includes a heating chamber 31 inside which the fabric passes through a heating channel. A heating component 33 is installed inside the heating chamber 31. A temperature sensor 34 for detecting the setting temperature is also installed inside the heating chamber 31. The central control device 60 is configured to control the heating component 33 to maintain the temperature inside the heating chamber 31 within the range of 110°C to 120°C based on the feedback signal from the temperature sensor 34.

[0043] The interior of the heating chamber 31 is divided into multiple independent temperature control zones 32, and each temperature control zone 32 is independently equipped with a heating component 33 and a temperature sensor 34.

[0044] The central control unit 60 is configured to independently control the temperature of each temperature control zone 32 with a control accuracy of ±1℃.

[0045] Specifically, the heat setting device 30 includes a heating chamber 31, the outer shell of which is wrapped with heat-insulating material, and the interior forms a heating channel for the fabric to pass through horizontally. The interior of the heating chamber 31 is physically divided into multiple independent temperature control sections 32 along the fabric conveying direction. Each temperature control section 32 is independently equipped with a heating component 33, such as an electric heating tube or a heat transfer oil heat exchanger, and a temperature sensor 34, such as a PT100 resistance temperature detector.

[0046] The central control unit 60 executes PID closed-loop control logic: it receives real-time temperature signals collected by temperature sensors 34 in each temperature control zone 32 and compares them with preset target values. When the detected temperature is lower than the set lower limit, the central control unit 60 outputs a signal to increase the switching duty cycle or voltage to the corresponding heating component 33. Through this control loop, the central control unit 60 strictly maintains the temperature of each temperature control zone 32 in the heating chamber 31 within the range of 110℃ to 120℃, and the temperature fluctuation control accuracy of a single temperature control zone 32 reaches ±1℃.

[0047] Furthermore, in conjunction with the operating speed control of the fabric conveying mechanism 90, the physical residence time of the fabric within the heating chamber 31 is controlled between 30 and 60 seconds. This combination of temperature and time parameters is used to induce thermal rearrangement of the fabric fiber molecules to eliminate internal stress.

[0048] The fixing agent application device 40 specifically includes a storage tank 41 disposed on one side of the fabric conveying path for containing cationic fixing agent and an application component 42 disposed on the fabric conveying path for the fabric to pass through. The storage tank 41 and the application component 42 are interconnected by a pipeline. A metering pump 43 is provided on the pipeline for extracting the fixing agent in the storage tank 41 and delivering it to the application component 42. The application component 42 includes an impregnation tank or an atomizing nozzle.

[0049] Specifically, the fixing agent application device 40 adopts a split layout. A storage tank 41 is located on the ground or support next to the equipment on one side of the fabric conveying path, containing a cationic fixing agent solution with a concentration of 2 g / L to 8 g / L. The application component 42 is located on the fabric conveying path, through which the fabric passes directly. The specific form of the application component 42 includes, but is not limited to, an impregnation tank containing the fixing agent or an array of opposing atomizing nozzles. The storage tank 41 and the application component 42 are physically connected via corrosion-resistant piping. A metering pump 43 is connected in series on the piping, and the metering pump 43 is communicatively connected to the central control device 60. The metering pump 43 is configured to quantitatively extract the fixing agent from the storage tank 41 and deliver it to the application component 42. By controlling the rotational speed or frequency of the metering pump 43, the system maintains the fabric pick-up rate within the range of 60% to 80%, ensuring that the cationic fixing agent fully reacts with the anionic dye on the fabric, sealing water-soluble groups.

[0050] In this embodiment, the cationic fixing agent is preferably a polymeric compound capable of dissociating into cationic groups in an aqueous solution to form ionic bonds with the anionic dye on the fabric. Specific types include, but are not limited to, one or a combination of the following:

[0051] Quaternary ammonium salt type fixing agent: It utilizes the quaternary ammonium cationic group in its molecular structure to combine with the dye anion, and is suitable for fixing reactive dyes or direct dyes;

[0052] Dicyandiamide-formaldehyde resin type fixing agent: It forms a network film on the fiber surface through polycondensation reaction, which can improve the fastness to wet treatment;

[0053] Polyamine-based formaldehyde-free color-fixing agents: As an environmentally friendly alternative, they have higher reactivity and do not release formaldehyde.

[0054] Regarding the selection of concentration, this invention has been experimentally verified that limiting the concentration to 2g / L to 8g / L has specific technical significance: when the concentration of the fixing agent is below 2g / L, the number of cationic groups in the solution is insufficient to neutralize the anions such as sulfonic acid groups of the dye molecules, resulting in incomplete lake formation and inability to effectively block the hydrolysis and release of the dye; when the concentration of the fixing agent is above 8g / L, excessive fixing agent will undergo self-polymerization on the fabric surface, not only wasting the agent but also easily causing the fabric to feel stiff and rough, and even causing irreversible yellowing or color deviation. As a preferred embodiment, this system uses a polyamine cationic fixing agent with a concentration of 5g / L, which ensures an improvement of 1-1.5 grades in dry / wet rubbing fastness while maintaining the original soft feel of the fabric.

[0055] The humidity conditioning and shaping device 50 includes a sealed processing chamber 51 with a sealed structure at the inlet and outlet, a dehumidification component 52 connected to the sealed processing chamber 51 for reducing indoor air humidity, and a humidity sensor 53 for detecting the relative humidity of the environment installed in the sealed processing chamber 51. The central control device 60 is configured to control the dehumidification component 52 to maintain the relative humidity in the sealed processing chamber 51 within the range of 40% to 50% based on the feedback signal from the humidity sensor 53.

[0056] The moisture conditioning and shaping device 50 is also equipped with a multi-layer guide roller group 54, which is configured to guide the fabric to reciprocate and meander within the sealed processing chamber 51 to increase the dwell time.

[0057] Specifically, the humidity conditioning and shaping device 50 includes a sealed processing chamber 51, with rubber sealing curtains or mechanical airlock structures installed at its fabric inlet and outlet to minimize indoor and outdoor gas exchange. A dehumidification component 52, such as a condensing dehumidifier or a rotary dehumidifier, is connected to the side wall of the sealed processing chamber 51 to extract indoor air, remove moisture, and return it. A humidity sensor 53 is located at the center of the chamber.

[0058] The central control unit 60 controls the start / stop or operating power of the dehumidification component 52 based on the relative humidity value fed back by the humidity sensor 53, so as to maintain the relative humidity in the sealed processing chamber 51 within the range of 40% to 50%.

[0059] Inside the sealed processing chamber 51, a multi-layered guide roller assembly 54 is arranged vertically in a staggered pattern. Guided by the guide roller assembly 54, the fabric is conveyed in an S-shaped or W-shaped reciprocating motion. This mechanical structure significantly increases the fabric's conveying path length within a limited physical space, extending the fabric's residence time in an environment with 40%-50% humidity to 5 to 10 minutes. This process allows the fabric fibers, after high-temperature drying, to slowly absorb moisture, eliminate static electricity, and stabilize dimensions.

[0060] The dyeing system also includes a feed tension control device 11 located on the other side of the floating dye cleaning device 20 for controlling the tension of the fabric entering the system, and a fabric conveying mechanism 90 that passes through the floating dye cleaning device 20, the heat setting device 30, the fixing agent application device 40, and the moisture conditioning and setting device 50 for continuously conveying the fabric. The dyeing system also includes a dyeing machine 10 located on the other side of the floating dye cleaning device 20, configured to dye the fabric before it enters the floating dye cleaning device 20.

[0061] Specifically, the dyeing system also includes a feed tension control device 11, corresponding to claim 8, located on the other side of the floating dye cleaning device 20, i.e., the feed end. This device includes a tension sensor and an adjusting roller, used to detect and adjust the radial tension of the fabric entering the system, ensuring that the fabric enters the cleaning process smoothly and without wrinkles. A fabric conveying mechanism 90, corresponding to claim 8, runs through the entire system. Its structure includes a motor-driven drive roller and several driven guide rollers, used to continuously pull the fabric through the aforementioned processing devices at a constant speed. On the other side of the floating dye cleaning device 20, a dyeing machine 10 is provided. The dyeing machine 10 is configured to dye the greige fabric.

[0062] Please see the appendix Figure 4 The present invention also provides a dyeing method for improving the color fastness of fabrics, comprising the following steps:

[0063] S1. Dyeing process: Place the fabric to be treated in a stainless steel dyeing machine 10 with a capacity of 400L to 600L (preferably 500L) and dye it according to the preset dyeing process conditions.

[0064] S2, Floating color cleaning step: The dyed fabric is transported to the cleaning tank 21 of the polyethylene floating color cleaning device 20, and the circulation pump 23 is started to circulate the cleaning liquid using the circulation filtration system to continuously clean the fabric for 15 to 25 minutes (preferably 20 minutes) to remove the surface floating color.

[0065] S3. Precise heat setting step: After washing, the fabric enters the heat setting device 30. The heating component 33 is controlled by the central control device 60 to adjust and maintain the temperature in the heating chamber 31 within the range of 110℃ to 120℃ to set the fabric, and the temperature control accuracy is ±1℃.

[0066] S4, Fixing agent impregnation step: The heat-set fabric is treated with a fixing agent by applying a cationic fixing agent to the fabric through the fixing agent application device 40.

[0067] S5. Conditioning and setting step: The fabric after applying the color-fixing agent is transported to the conditioning and setting device 50. The dehumidification component 52 is controlled by the central control device 60 to maintain the relative humidity of the environment in the sealed processing chamber 51 within the range of 40% to 50%, and the fabric is continuously processed in this humidity environment for 20 to 30 minutes (preferably 30 minutes) to complete the final setting.

[0068] Working principle: First, the fabric undergoes the dyeing process in the stainless steel overflow dyeing machine 10. Then, the fabric is continuously drawn into the subsequent processing unit by the fabric conveying mechanism 90. The fabric passes through the feed tension control device 11 located on one side of the floating dye cleaning device 20. This device applies a preset mechanical tension to the fabric to eliminate wrinkles generated during the dyeing process and maintain a flat transport state. Subsequently, the fabric enters the floating dye cleaning device 20, which consists of a polyethylene cleaning tank 21. During this stage, the circulating pump 23 operates at a speed of 10 m³ / h. 3 / h to 15m 3 A flow rate of / h is used to draw cleaning fluid from the bottom of the cleaning tank 21 and deliver it to the filter 24 for mechanical filtration to remove impurities. The filtered cleaning fluid is then pumped to the spray assembly 22 located inside the cleaning tank 21. The spray assembly 22 performs high-pressure spray rinsing on the fabric surface to physically remove unfixed dyes and floating colors adhering to the fabric surface. The cleaned liquid flows back to the bottom of the cleaning tank 21 to form a circulation loop.

[0069] After washing, the fabric is conveyed by the fabric conveying mechanism 90 to the heat setting device 30. The fabric enters the heating channel inside the heating chamber 31. The central control device 60 receives temperature detection signals from temperature sensors 34 located in each temperature control section 32 of the heating chamber 31 and compares them with preset temperature thresholds. When the detected temperature deviates from the set range, the central control device 60 sends control commands to the corresponding heating components 33 to adjust the heating power, thereby strictly maintaining the ambient temperature inside the heating chamber 31 within the range of 110℃ to 120℃, and ensuring that the independent control accuracy of each temperature control section 32 is maintained at ±1℃. Under this temperature environment, the operating speed of the fabric conveying mechanism 90 is controlled within a specific range, ensuring that the physical residence time of the fabric in the heating chamber 31 is maintained between 30 and 60 seconds. This allows the fabric fiber molecular chains to move and rearrange using heat energy, eliminating internal stress and initially fixing the dimensions.

[0070] After heat setting, the fabric continues to be conveyed to the fixing agent application device 40. The storage tank 41, located on one side of the conveying path, is pre-filled with a cationic fixing agent solution with a concentration of 2g / L to 8g / L. The metering pump 43 connected to the pipeline extracts the fixing agent solution from the storage tank 41 according to the unit weight of the fabric and the conveying speed, and delivers it to the application component 42 located on the conveying path. When the fabric passes through the application component 42, the fixing agent is evenly applied to the surface of the fabric. The flow control of the metering pump 43 keeps the liquid carry-over rate of the fabric between 60% and 80%. The cationic fixing agent and the anionic group of the dye are used to seal the water-soluble groups, thereby improving the color fastness.

[0071] Finally, the fabric enters the sealed processing chamber 51 of the moisture conditioning and shaping device 50. Inside the sealed processing chamber 51, the fabric is guided by a multi-layer guide roller group 54 and reciprocated, extending the residence time of the fabric in the chamber to 5 to 10 minutes. During this period, the humidity sensor 53 installed in the chamber detects the relative humidity of the environment in real time and transmits the data to the central control device 60. The central control device 60 controls the start-up, shutdown, and operating power of the dehumidification component 52 connected to the sealed processing chamber 51 according to the feedback signal, so as to accurately maintain the relative humidity in the sealed processing chamber 51 within the range of 40% to 50%. This controlled humidity environment allows the fabric fibers after heat treatment and chemical treatment to reach moisture regain balance during the slow moisture absorption process, eliminating static electricity and rough hand feel caused by drying. Finally, all post-processing procedures are completed and the fabric is output from the system by the fabric conveying mechanism 90.

Claims

1. A dyeing system for improving the color fastness of fabrics, characterized in that, It includes a floating color washing device (20), a heat setting device (30), a color fixing agent application device (40), and a moisture conditioning and setting device (50) arranged sequentially and connected to each other along the fabric conveying direction. The floating dye cleaning device (20) is configured to receive the dyed fabric and remove the unfixed dye from the surface. The feed side of the heat setting device (30) is provided with a floating dye cleaning device (20) for conveying the cleaned fabric to the heat setting device. The side of the fixing agent application device (40) is provided with a heat setting device (30) for applying fixing agent to the set fabric. The side of the humidity setting device (50) is provided with a fixing agent application device (40) for providing a controlled humidity environment for the fabric to complete the final setting. The dyeing system also includes a central control device (60), which is electrically connected to the heat setting device (30) and the humidity setting device (50) respectively, and is configured to control the heating temperature of the heat setting device (30) and the internal humidity of the humidity setting device (50).

2. The dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The floating color cleaning device (20) includes a cleaning tank (21) for containing cleaning liquid and passing fabric, a spray assembly (22) disposed inside the cleaning tank (21) for spraying cleaning liquid onto the fabric, and a circulating filter assembly consisting of a circulating pump (23) and a filter (24). The input end of the circulating pump (23) is connected to the bottom of the cleaning tank (21), and the output end is connected to the spray assembly (22) via the filter (24) to form a circulating loop for the cleaning liquid.

3. The dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The heat setting device (30) includes a heating chamber (31) inside which the fabric passes through a heating channel. A heating component (33) is provided inside the heating chamber (31). A temperature sensor (34) for detecting the setting temperature is also provided inside the heating chamber (31). The central control unit (60) is configured to control the heating assembly (33) to maintain the temperature inside the heating chamber (31) within a preset temperature range based on the feedback signal from the temperature sensor (34).

4. The dyeing system for improving the color fastness of fabrics according to claim 3, characterized in that, The heating chamber (31) is divided into multiple independent temperature control sections (32), and each of the multiple temperature control sections (32) is independently equipped with a heating component (33) and a temperature sensor (34). The central control unit (60) is configured to independently control the temperature of each of the temperature control zones (32).

5. The dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The fixing agent application device (40) specifically includes a storage tank (41) disposed on one side of the fabric conveying path for containing cationic fixing agent and an application component (42) disposed on the fabric conveying path for the fabric to pass through. The storage tank (41) and the application component (42) are interconnected by a pipeline. A metering pump (43) is provided on the pipeline for extracting the fixing agent in the storage tank (41) and delivering it to the application component (42). The application component (42) includes an impregnation tank or an atomizing nozzle.

6. The dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The humidity conditioning and shaping device (50) includes a sealed processing chamber (51) with a sealed structure at the inlet and outlet, and a dehumidification component (52) connected to the sealed processing chamber (51) for reducing indoor air humidity. A humidity sensor (53) for detecting the relative humidity of the environment is installed in the sealed processing chamber (51). The central control unit (60) is configured to control the dehumidification assembly (52) to maintain the relative humidity in the sealed processing chamber (51) within a preset range based on the feedback signal from the humidity sensor (53).

7. A dyeing system for improving the colorfastness of fabrics according to claim 6, characterized in that, The moisture conditioning and shaping device (50) is also equipped with a multi-layer guide roller group (54), which is configured to guide the fabric to reciprocate and circumferentially convey within the sealed processing chamber (51) to increase the dwell time.

8. The dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The dyeing system also includes a feed tension control device (11) located on the other side of the floating dye washing device (20) for controlling the tension of the fabric entering the system, and a fabric conveying mechanism (90) that runs through the floating dye washing device (20), the heat setting device (30), the fixing agent application device (40), and the moisture conditioning and setting device (50) for continuously conveying the fabric.

9. A dyeing system for improving the color fastness of fabrics according to claim 1, characterized in that, The dyeing system also includes a dyeing machine (10) located on the other side of the floating dye cleaning device (20), the dyeing machine (10) being configured to dye the fabric before it enters the floating dye cleaning device (20).

10. A dyeing method for improving the color fastness of fabrics, characterized in that, The dyeing system for improving the colorfastness of fabrics as described in any one of claims 1-9 includes the following steps: S1. Dyeing process: Place the fabric to be treated in a stainless steel dyeing machine (10) with a capacity of 400L to 600L and dye it according to the preset dyeing process conditions. S2, Floating color cleaning step: The dyed fabric is transported to the cleaning tank (21) of the polyethylene floating color cleaning device (20), the circulation pump (23) is started and the cleaning liquid is circulated using the circulation filtration system to continuously clean the fabric for 15 to 25 minutes to remove the surface floating color. S3, Precise heat setting step: After cleaning, the fabric enters the heat setting device (30). The heating component (33) is controlled by the central control device (60) to adjust and maintain the temperature in the heating box (31) within the range of 110°C to 120°C to set the fabric, and the temperature control accuracy is ±1°C. S4, Fixing agent impregnation step: The heat-set fabric is treated with a fixing agent, and a cationic fixing agent is applied to the fabric through a fixing agent application device (40); S5. Conditioning and setting step: The fabric after applying the color-fixing agent is transported to the conditioning and setting device (50). The dehumidification component (52) is controlled by the central control device (60) to maintain the relative humidity of the environment in the sealed processing chamber (51) within the range of 40% to 50%, and the fabric is continuously processed in this humidity environment for 20 to 30 minutes to complete the final setting.

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