Nylon fabric color fixing equipment and color fixing process

Abstract

The invention discloses nylon fabric color fixing equipment and a color fixing process, and the nylon fabric color fixing equipment comprises a cloth feeding device which is used for receiving and flattening a dyed fabric; the rinsing device is used for washing the flattened dyed fabric; the color fixing device comprises a color fixing box, color fixing liquid is arranged in the color fixing box, a conveying line is arranged in a color fixing cavity, the conveying line is located below the liquid level of the color fixing liquid and used for conveying dyed fabric, the conveying assembly comprises a first driving part and a plurality of color fixing rollers, and the color fixing rollers are located above the liquid level of the color fixing liquid at intervals and used for conveying the dyed fabric. A first spraying assembly is arranged above the color fixing roller, the first spraying assembly sprays color fixing liquid to the dyed fabric on the color fixing roller, and one of the conveying line and the conveying assembly is selected to convey the dyed fabric. According to the color fixing equipment for the nylon fabric, due to the arrangement of the color fixing device, different color fixing modes can be selected for dyed fabrics of different dyeing processes, and the color fixing adaptability of the dyed fabrics under the different dyeing processes is improved.

Description

Technical Field

[0001] This invention relates to the field of textile dyeing and finishing technology, and in particular to a color-fixing device and process for nylon fabrics. Background Technology

[0002] Nylon, also known as polyamide, is the commercial name for synthetic polyamide fiber. Currently, nylon fabrics are mainly dyed and fixed in the dyeing vat using two types of dyeing machines: overflow dyeing machines and warp-beam dyeing machines. However, during the fixing process, if the nylon fabric dyed by the overflow dyeing machine has fixing agent adhering to the surface, there will be uneven fixing, poor fixing effect, and a large amount of fixing agent in medium and dark nylon, resulting in a rougher and harder feel, slower gliding, and increased susceptibility to abrasion. Nylon fabric dyed by the warp-beam dyeing machine suffers from insufficient fixing agent penetration, large differences in fastness between the inner and outer layers, and is prone to creases when piled up for fixing. Furthermore, piling up for fixing in the dyeing vat is not only time-consuming but also inefficient. Summary of the Invention

[0003] The purpose of this invention is to provide a nylon fabric color-fixing device and color-fixing process. It has a simple structure and can select different color-fixing methods according to the dyeing type of the fabric for continuous color-fixing production, ensuring the color-fixing effect of the dyed fabric and achieving high production efficiency.

[0004] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, a nylon fabric color-fixing device is provided, comprising a fabric feeding device, a rinsing device, a color-fixing device, and a first receiving device. The fabric feeding device is used to receive and flatten the dyed fabric. The rinsing device is located downstream of the fabric feeding device and is used to wash the flattened dyed fabric. The color-fixing device is located downstream of the rinsing device and includes a color-fixing box, a conveyor line, a conveying assembly, and a first spraying assembly. The color-fixing box has a color-fixing chamber containing a color-fixing liquid. The conveyor line is also located within the color-fixing chamber and is positioned below the surface of the color-fixing liquid for conveying the dyed fabric along a first direction. The conveying assembly includes a first driving component and multiple color-fixing rollers. The multiple color-fixing rollers... The first direction is arranged and rotatably disposed in the fixing chamber. The rotation axis of the fixing roller extends along the second direction. The first driving member is used to drive the fixing roller to rotate along its own rotation axis. The fixing roller is spaced above the liquid surface of the fixing liquid and is used to convey the dyed fabric along the first direction. The first spraying assembly is disposed above the fixing roller. The first spraying assembly is used to spray the fixing liquid onto the dyed fabric conveyed on the fixing roller. The conveying line and the conveying assembly are selected to convey the dyed fabric. The first direction is perpendicular to the second direction. The first receiving device is disposed downstream of the fixing device and is used to discharge the dyed fabric after fixing in the fixing device.

[0005] In one embodiment, the color-fixing box is further provided with an inlet and an outlet communicating with the color-fixing cavity. The inlet and the outlet are respectively located on both sides of the color-fixing box along the first direction. The color-fixing device further includes a first drive roller and a first guide roller disposed within the color-fixing cavity, with the first drive roller and the first guide roller disposed adjacent to the inlet. The first drive roller is located below the surface of the color-fixing liquid, and the first guide roller is located above the surface of the color-fixing liquid. The washed dyed fabric is sequentially conveyed around the first drive roller and the first guide roller to the conveyor line or the color-fixing roller; and / or, The color-fixing device further includes a second drive roller and a second guide roller disposed in the color-fixing cavity, and the second drive roller and the second guide roller are disposed adjacent to the discharge port. The second drive roller is located below the liquid surface of the color-fixing liquid, and the second guide roller is located above the liquid surface of the color-fixing liquid. The dyed fabric, after being conveyed by the color-fixing roller or the conveyor line, is sequentially conveyed around the second guide roller and the second drive roller and then discharged from the discharge port.

[0006] In one embodiment, the color-fixing device further includes a first rolling mill, which is disposed between the first guide roller and the conveying assembly, and is used to remove excess moisture from the dyed fabric between the first guide roller and the conveying assembly.

[0007] In one embodiment, the color-fixing device further includes a first roller, which is disposed between the conveying assembly and the second guide roller, and is used to remove excess moisture from the dyed fabric between the conveying assembly and the second guide roller.

[0008] In one embodiment, the color-fixing device further includes a second driving member and a fabric-tapping roller. The fabric-tapping roller is disposed between the first guide roller and the conveyor line. The fabric-tapping roller is rotatably connected to the cavity wall of the color-fixing chamber, and the rotation axis of the fabric-tapping roller extends along the second direction. Multiple corrugated portions are spaced apart on the outer periphery of the fabric-tapping roller. The second driving member is used to drive the fabric-tapping roller to rotate, so that the corrugated portions tap the dyed fabric between the first guide roller and the conveyor line.

[0009] In one embodiment, the outer peripheral surface of the fixing roller is provided with a plurality of fixing grooves at intervals, and the first spraying assembly is capable of spraying the fixing liquid into the fixing grooves; and / or, The two adjacent color-fixing rollers are staggered in the vertical direction, which is perpendicular to the first direction and the second direction, respectively.

[0010] In one embodiment, the rinsing device includes at least one rinsing tank containing detergent. The rinsing tank also contains a third guide roller and a roller. The third guide roller is located below the surface of the detergent, and the roller is located above the surface of the detergent. The dyed fabric is sequentially conveyed around the third guide roller and the roller. A second spray assembly is also provided above the roller, the second spray assembly being used to spray the detergent onto the dyed fabric conveyed on the roller for cleaning.

[0011] In one embodiment, the rinsing device is provided with two rinsing tanks, namely a first rinsing tank and a second rinsing tank, wherein the first rinsing tank is disposed adjacent to the fabric insertion device, and the second rinsing tank is provided with a drain outlet communicating with the first rinsing tank; and / or, A second roller is located behind the rinsing tank, away from the fabric feeding device. The second roller is used to remove excess water from the dyed fabric after rinsing.

[0012] In one embodiment, the nylon fabric color-fixing equipment further includes an unwinding machine, through which the flat-width dyed fabric is unwound and introduced into the fabric feeding device; and / or, The dyed fabric with an open width is directly introduced into the fabric feeding device.

[0013] In one embodiment, the nylon fabric color-fixing equipment further includes an immersion device disposed between the color-fixing device and the first receiving device. The immersion device includes an immersion tank containing at least one of an absorbent, a softener, and an anti-yellowing agent. The dyed fabric, after color fixing, is immersed in the immersion tank. A third roller is disposed upstream and downstream of the immersion tank, respectively, to remove excess moisture from the dyed fabric as it passes through the upstream and downstream sections of the immersion tank; and / or, The nylon fabric color-fixing equipment also includes a dryer and a second receiving device. The dryer and the second receiving device are arranged sequentially on the side of the first receiving device away from the color-fixing device. The dyed fabric can pass through the first receiving device into the dryer for drying. The second receiving device is used to remove the dyed fabric after it has been dried by the dryer.

[0014] Secondly, a color-fixing process for nylon fabric is provided, which utilizes the aforementioned nylon fabric color-fixing equipment, and the specific steps include: S10. Identify the type of dyed fabric and select the color-fixing method for the dyed fabric in the color-fixing box; S20. The dyed fabric is flattened by the fabric feeding device and then conveyed to the rinsing tank for washing with detergent. S30. The washed dyed fabric is passed through a second roller to remove excess water, and then transferred to the color-fixing box. S40. Select either an immersion-type color-fixing method or a spray-type color-fixing method according to the type of dyed fabric. The immersion-type color-fixing method is as follows: the dyed fabric in the color-fixing box is patted by the fabric-patting roller and freely stacked on the conveyor line for conveying along the first direction, and is immersed in the color-fixing liquid for color-fixing treatment. The spray-type color-fixing method is as follows: the dyed fabric in the color-fixing box is sequentially wound around multiple color-fixing rollers arranged and rotating along the first direction and conveyed along the first direction; the color-fixing liquid is sprayed onto the dyed fabric conveyed on the color-fixing rollers by the first spray assembly for color-fixing treatment. S50. After color fixing, the dyed fabric is softened, protected against yellowing, and / or dried before being exported and stored.

[0015] In one embodiment, the dyed fabric is conveyed at a speed of 15-35 m / min and a fabric tension of 0.5-8.0 kg.

[0016] In one embodiment, when the fabric is conveyed for color fixing using the conveyor line, the conveyor line immerses the dyed fabric in a color fixing solution with a concentration of 3-6 g / L, a temperature of 55-70°C, and a pH of 4-4.5 for 30-600 seconds; or when the fabric is conveyed for color fixing using the color fixing roller, the first spray assembly sprays a color fixing solution with a concentration of 3-6 g / L and a pH of 4-4.5, maintaining the dyed fabric conveyed on the color fixing roller in an environment of 55-70°C for color fixing.

[0017] In one embodiment, in step S10, after the dyed fabric is washed in the first rinsing tank, it passes through a second rolling mill to remove excess water before entering the second rinsing tank for washing. Each rinsing tank is equipped with a concentration detector and a dosage replenishment mechanism for replenishing the detergent concentration. The second rinsing tank is continuously injected with clean water, and the flow rate of the clean water is controlled at 2-4 m³ / h. 3 / h, and the clean water in the second rinsing tank can flow into the first rinsing tank.

[0018] In one embodiment, in step S30, before the dyed fabric is conveyed by the conveyor line or the fixing roller for color fixing treatment, the dyed fabric is immersed in the color fixing solution in the color fixing tank once for pre-color fixing treatment; and / or, After the dyed fabric is conveyed by the conveyor line or the color-fixing roller for color-fixing treatment, the dyed fabric is immersed again in the color-fixing liquid in the color-fixing box for enhanced color-fixing treatment.

[0019] The beneficial effects of this invention are: This invention discloses a nylon fabric color-fixing device. Through the setting of the color-fixing device, dyed fabrics of different dyeing types can be fixed by either winding a color-fixing roller and conveying it with a first spray component to spray color-fixing liquid, or by stacking them on a conveyor line and being conveyed and immersed in color-fixing liquid. This improves the adaptability of dyed fabrics to color-fixing under different dyeing processes, ensures the color-fixing effect of the dyed fabrics, and eliminates dyeing defects such as color difference, abrasions, or creases. Combined with the fabric feeding device for flattening the dyed fabric, the rinsing device for washing the dyed fabric, and the first receiving device for exporting the color-fixed dyed fabric, continuous production of conveyor-type color-fixing of dyed fabrics is realized, saving time and labor, and achieving high production efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the nylon fabric color-fixing equipment in one embodiment (excluding the dryer); Figure 2 This is a schematic diagram of the fabric insertion device and rinsing device in one embodiment; Figure 3 This is a schematic diagram of the color-fixing device in one embodiment; Figure 4 This is a partial structural schematic diagram of a nylon fabric color-fixing device in one embodiment.

[0021] In the picture: 1. Fabric feeding device; 2. Rinsing device; 21. Rinsing tank; 22. Third guide roller; 23. Roller; 24. Second spray assembly; 3. Color fixing device; 31. Color fixing box; 311. Color fixing chamber; 32. Conveyor line; 33. First spray assembly; 34. Color fixing roller; 4. First take-up device; 5. First drive roller; 6. First guide roller; 7. Second drive roller; 8. Second guide roller; 9. First rolling mill; 10. Fabric patting roller; 11. Second rolling mill; 12. Unwinder; 13. Soaking device; 14. Third rolling mill; 15. Dryer; 16. Second take-up device; 17. Tension sensor. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0023] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0026] like Figures 1 to 4 As shown, a nylon fabric color-fixing device in this embodiment includes a fabric feeding device 1, a rinsing device 2, a color-fixing device 3, and a first receiving device 4. The fabric feeding device 1 is used to receive and flatten the dyed fabric. The rinsing device 2 is located downstream of the fabric feeding device 1 and is used to wash the flattened dyed fabric. The color-fixing device 3 is located downstream of the rinsing device 2 and includes a color-fixing box 31, a conveyor line 32, a conveying assembly, and a first spraying assembly 33. The color-fixing box 31 is provided with a color-fixing chamber 311, which is provided with a color-fixing liquid. The color-fixing chamber 311 is also provided with a conveyor line 32, which is located below the liquid surface of the color-fixing liquid and is used to convey the dyed fabric along a first direction (the first direction is the X direction shown in the figure). That is, the washed dyed fabric is conveyed along the first direction by the conveyor line 32 so that the dyed fabric is immersed in the color-fixing liquid for color fixing.

[0027] The conveying assembly includes a first driving member and multiple fixing rollers 34. The multiple fixing rollers 34 are arranged along a first direction and rotatably disposed in the fixing cavity 311. The rotation axis of the fixing rollers 34 extends along a second direction (the second direction is perpendicular to the paper shown in the figure, not shown). The first driving member is used to drive the fixing rollers 34 to rotate along their own rotation axis. The fixing rollers 34 are spaced above the liquid surface of the fixing liquid for conveying the dyed fabric along the first direction. A first spraying assembly 33 is disposed above the fixing rollers 34. The first spraying assembly 33 is used to spray the dyed fabric conveyed on the fixing rollers 34 with fixing liquid for fixing. The conveying line 32 and the conveying assembly are selected to convey the dyed fabric. The first direction is perpendicular to the second direction. A first receiving device 4 is disposed downstream of the fixing device 3. The first receiving device 4 is used to discharge the dyed fabric after fixing in the fixing device 3. It should be noted that upstream and downstream refer to the conveying direction of the dyed fabric. The fabric feeding device 1, rinsing device 2, color fixing device 3 and the first receiving device 4 can be arranged in a straight line along the first direction or in a non-straight line, as long as the upstream processing is completed and the fabric can be conveyed to the downstream device position.

[0028] It is understood that the nylon fabric color-fixing equipment of the present invention, through the setting of the color-fixing device 3, enables fabrics dyed by different dyeing processes to choose between being wound around the color-fixing roller 34 for conveying and combined with the first spraying component 33 for spraying color-fixing liquid, or to choose to be stacked on the conveyor line 32 for conveying and immersing in color-fixing liquid for color-fixing, thereby improving the adaptability of dyed fabrics to color-fixing under different dyeing processes, ensuring the color-fixing effect of dyed fabrics, and eliminating dyeing defects such as color difference, abrasions, or creases; combined with the fabric feeding device 1 for flattening the dyed fabric, the rinsing device 2 for washing the dyed fabric, and the first receiving device 4 for exporting the dyed fabric after color-fixing, continuous production of dyed fabric conveying color-fixing is realized, saving time and labor, and achieving high production efficiency. Moreover, the color-fixing equipment is set independently of the dyeing tank, without occupying the dyeing process of the dyeing tank, effectively ensuring that the dyeing and color-fixing processes of the dyed fabric can be carried out separately and simultaneously, effectively improving the production efficiency of dyed fabrics.

[0029] Specifically, the fabric dyed by the cylinder dyeing machine is flattened and conveyed by the fabric feeding device 1. The fabric feeding device 1 may include a machine head tensioning frame, tension roller, guide roller, and edge catcher arranged in sequence to achieve centering. The tension roller provides real-time feedback on the fabric tension within the fabric feeding device 1, allowing the guide roller to adjust its speed to maintain stable fabric tension, ensuring the dyed fabric is flat and wrinkle-free, and preventing uneven dyeing caused by wrinkles. After being flattened by the fabric feeding device 1, the fabric enters the rinsing device 2 for washing to remove excess dye. The washed dyed fabric enters the color-fixing box 31, where multiple color-fixing rollers 34 are wound around it in sequence. The color-fixing rollers 34, combined with the first spray assembly 33, evenly spray color-fixing liquid onto the conveyed dyed fabric for thorough immersion and color-fixing treatment, allowing the dyed fabric to fully absorb the color-fixing liquid, eliminating large differences in fastness between the inner and outer sides. At the same time, the color-fixing rollers 34 can eliminate the problem of creases caused by stacked color-fixing, ensuring the color-fixing quality of the dyed fabric produced by the cylinder dyeing machine. It is worth noting that the first spraying assembly 33 uses a circulating pump to draw the fixing liquid stored in the fixing chamber 311 for spraying, so that the fixing liquid can be fully recycled and resources can be saved. In this embodiment, there are 14 fixing rollers 34. The dyed fabric is conveyed around the 14 rotating fixing rollers 34 in sequence to ensure the fixing time of the dyed fabric on the fixing rollers 34.

[0030] After being dyed by the overflow dyeing machine, the fabric is transferred to the fixing chamber 311 after passing through the fabric feeding device 1 and the rinsing device 2. It is then stacked sequentially on the conveyor line 32 and immersed in the fixing liquid in the fixing chamber 311 for fixing. This eliminates the problem of the dyed fabric becoming rough, hard, and easily scratched after being dyed by the overflow dyeing machine. Furthermore, the fabric is conveyed by the conveyor line 32, ensuring the conveying speed of the dyed fabric and thus effectively ensuring the fixing efficiency of the dyed fabric.

[0031] Furthermore, such as Figure 1 and Figure 3 As shown, the color-fixing box 31 is also provided with an inlet and an outlet communicating with the color-fixing cavity 311. The inlet and outlet are respectively located on both sides of the color-fixing box 31 along the first direction. The color-fixing device 3 also includes a first drive roller 5 and a first guide roller 6 disposed in the color-fixing cavity 311. The first drive roller 5 and the first guide roller 6 are disposed adjacent to the inlet. The first drive roller 5 is located below the liquid surface of the color-fixing liquid, and the first guide roller 6 is located above the liquid surface of the color-fixing liquid. The dyed fabric after washing is sequentially conveyed to the conveyor line 32 or the color-fixing roller 34 after passing through the first drive roller 5 and the first guide roller 6, so that the dyed fabric can be immersed in the color-fixing liquid once when passing through the first drive roller 5. The rotation of the first drive roller 5 enables the dyed fabric to be transferred. The first drive roller 5 is an active rotating roller, which can reduce the friction between the dyed fabric and the roller compared with the passive roller, thereby reducing the fabric surface abrasion and defects. When the fabric enters the color-fixing chamber 311 from the feed port, it is first immersed in the color-fixing liquid. Combined with subsequent color-fixing, the dyed fabric is color-fixed multiple times, which increases the color fastness and achieves the purpose of improving the color-fixing effect.

[0032] Optionally, such as Figure 1 and Figure 3 As shown, the color-fixing device 3 also includes a second drive roller 7 and a second guide roller 8 disposed within the color-fixing cavity 311. The second drive roller 7 and the second guide roller 8 are located adjacent to the discharge port. The second drive roller 7 is positioned below the surface of the color-fixing liquid, and the second guide roller 8 is positioned above the surface of the color-fixing liquid. The dyed fabric, after being conveyed by the color-fixing roller 34 or the conveyor line 32, sequentially passes around the second guide roller 8 and the second drive roller 7 before exiting the discharge port, allowing the dyed fabric to be immersed in the color-fixing liquid again when it passes the second drive roller 7. The rotation of the second drive roller 7 enables the dyed fabric to be transferred. The second drive roller 7 is an active rotating roller, which, compared to a passive roller, reduces the friction between the dyed fabric and the roller, thereby reducing fabric abrasions and defects. By immersing the dyed fabric in the color-fixing liquid again before it leaves the color-fixing cavity 311 from the discharge port, the aforementioned two color-fixing processes achieve multiple color-fixing of the dyed fabric, increasing color fastness and ensuring the color-fixing effect of the dyed fabric.

[0033] Furthermore, the color-fixing device 3 also includes a first roller 9, which is positioned between the first guide roller 6 and the conveying assembly. The first roller 9 is used to remove excess moisture from the dyed fabric between the first guide roller 6 and the conveying assembly. The liquid content of the dyed fabric is maintained between 40% and 50%. The first roller 9 can be a double-roller or triple-roller roller. By removing moisture from the dyed fabric sandwiched between them, it can accelerate the adsorption and fixation of dye on the fibers, ensuring a more uniform and firm color. At the same time, it also facilitates the improvement of the wetting effect of the color-fixing liquid during the secondary color-fixing of the dyed fabric on the color-fixing roller 34, ensuring that the subsequent color-fixing liquid is evenly adsorbed.

[0034] Of course, when the second transmission roller 7 is used for the third color-fixing treatment, a first roller 9 is also installed between the conveying assembly and the second guide roller 8. The first roller 9 is used to remove excess moisture from the dyed fabric between the conveying assembly and the second guide roller 8. This can accelerate the adsorption and fixation of dye on the fibers, ensuring a more uniform and firm color, and also facilitates the improvement of the third color-fixing effect of the color-fixing liquid when the dyed fabric is conveyed on the second conveying roller. It is worth noting that the dyed fabric dyed by the shaft cylinder dyeing machine is actively conveyed by multiple active rollers, including the first conveying roller, the first roller 9, the color-fixing roller 34, and the second conveying roller. Tension sensors 17 are also installed between the first roller 9 near the feed inlet and the color-fixing roller 34, and between the color-fixing roller 34 and the first roller 9 near the discharge outlet, respectively, to monitor the fabric tension in real time and adaptively adjust the rotation speed of each active roller to maintain a fabric tension of 0.5-8.0 kg, preventing the dyed fabric from curling due to excessive tension or wrinkles, wicker marks, and other dyeing defects due to insufficient tension.

[0035] In some embodiments, the dyed fabric after being dyed by the overflow dyeing machine does not need to be rolled by the first roller 9 after being first immersed in the fixing solution on the first conveyor roller. The fixing device 3 also includes a second drive member and a patting roller 10. The patting roller 10 is disposed between the first guide roller 6 and the conveyor line 32. The patting roller 10 is rotatably connected to the cavity wall of the fixing chamber 311, and the rotation axis of the patting roller 10 extends along a second direction. Multiple corrugated sections are provided at intervals on the outer periphery of the patting roller 10. The second drive member is used to drive the patting roller 10 to rotate, so that the corrugated sections pat the dyed fabric between the first guide roller 6 and the conveyor line 32. That is, the dyed fabric after being dyed by the overflow dyeing machine is connected to the patting roller 10 after passing through the first conveyor roller and the first guide roller 6. The patting roller 10 is used to pat the fabric to accelerate the adsorption and penetration speed of the pigment in the dye, improve the fixing efficiency, and ensure the uniform dyeing effect of the dyed fabric.

[0036] Furthermore, the outer circumferential surface of the fixing roller 34 is provided with multiple fixing grooves at intervals, and the first spraying component 33 can spray the fixing liquid into the fixing grooves. Through the design of multiple fixing grooves, and the arrangement of the fixing roller 34 for rotation, the fixing liquid can be continuously and stably sprayed onto the dyed fabric conveyed by the fixing roller 34, which can ensure that the fixing liquid and the dyed fabric are in full contact, enhance the adhesion of the dye, improve the color fastness, and achieve a more efficient fixing process. Moreover, the distribution of the fixing liquid in the fixing groove is more uniform, which can effectively improve the uniformity of fixing and reduce color spots or dyeing defects caused by uneven distribution due to direct spraying of fixing liquid.

[0037] Optionally, such as Figure 1 and Figure 3As shown, adjacent fixing rollers 34 are staggered vertically (vertical direction is shown as Z direction), and the vertical direction is perpendicular to the first direction and the second direction, respectively. The staggered arrangement of the fixing rollers 34 extends the conveying distance and immersion time of the dyed fabric in the conveying assembly, ensuring the color-fixing effect of the dyed fabric in the fixing solution. In this embodiment, there are a total of 14 fixing rollers 34. Seven fixing rollers 34 are arranged in a row at intervals along the first direction, and two rows of fixing rollers 34 are arranged vertically. The dyed fabric is alternately wrapped around the two rows of fixing rollers 34, moving up and down sequentially.

[0038] In other embodiments, such as Figure 1 and Figure 2 As shown, the rinsing device 2 includes at least one rinsing tank 21, which contains detergent. A third guide roller 22 and a roller 23 are also located within the rinsing tank 21. The third guide roller 22 is positioned below the detergent solution, while the roller 23 is positioned above it. The dyed fabric is sequentially conveyed around the third guide roller 22 and the roller 23. A second spray assembly 24 is positioned above the roller 23, used to spray detergent onto the dyed fabric conveyed on the roller 23 for cleaning. After the flattened dyed fabric is guided to the detergent solution by the third guide roller 22 for washing, it is then conveyed to the roller 23. The second spray assembly 24 uses a circulating pump to extract detergent from the rinsing tank 21 and spray it onto the dyed fabric on the roller 23 to thoroughly wash the fabric and remove any loose dye. In this embodiment, two third guide rollers 22 are provided in the rinsing tank 21. The two third guide rollers 22 are spaced apart along the first direction and are both located below the liquid surface of the detergent. The roller 23 is disposed between the two third guide rollers 22, so that after the dyed fabric is soaked in detergent, it is conveyed to the roller 23, sprayed and rinsed by the second spray assembly 24, and then soaked in detergent again for multiple washes.

[0039] Furthermore, the rinsing device 2 is equipped with two rinsing tanks 21, namely a first rinsing tank 21 and a second rinsing tank 21. The first rinsing tank 21 is located adjacent to the fabric feeding device 1, and the second rinsing tank 21 is equipped with a drain outlet that communicates with the first rinsing tank 21. The use of two rinsing tanks 21 facilitates multiple washes of the dyed fabric, ensuring that residual dye and surface loose dye are effectively removed, improving the washing-out effect of loose dye, and laying a clean foundation for subsequent color fixing. The detergent in the second rinsing tank 21 has a higher purity than the detergent used in the first rinsing tank 21 for washing the dyed fabric. By allowing the detergent in the second rinsing tank 21 to flow back to the first rinsing tank 21 through the drain outlet for reuse, the utilization rate of the detergent is improved, achieving water conservation, energy saving, and reduced production costs.

[0040] Of course, both the first and second rinsing tanks 21 are equipped with liquid level sensors and temperature sensors to ensure the detergent level and temperature. Detergent exceeding the liquid level in the first rinsing tank 21 is discharged into the wastewater ditch. Furthermore, the first and second rinsing tanks 21 are also equipped with inlet water flow meters and detergent concentration detection and replenishment mechanisms, respectively. By controlling the inlet of clean, warm water and the replenishment of detergent, the detergent concentration is maintained, thereby ensuring effective washing and desiccation.

[0041] Furthermore, a second roller 11 is located behind the rinsing tank 21, away from the fabric feeding device 1. The second roller 11 is used to remove excess water from the dyed fabric after rinsing. The second roller 11 is a double-roller roller, that is, two drive rollers rotating in opposite directions to clamp the dyed fabric and perform a water-binding treatment to remove excess water, so as to ensure uniform adsorption of the subsequent fixing solution. It should be noted that tension sensors 17 are installed before the fabric is fed into the rinsing tank 21 and after it is discharged from the rinsing tank 21 to reflect the fabric tension in real time as the dyed fabric is conveyed in the rinsing tank 21, and to adaptively adjust the rotation speed of the third guide roller 22 and the rollers to maintain the fabric tension of the dyed fabric at 0.5-8.0 kg, so as to prevent the dyed fabric from curling due to excessive tension or wrinkles, wicker marks and other dyeing defects due to insufficient tension.

[0042] In other embodiments, the nylon fabric color-fixing equipment also includes an unwinding machine 12. Some flat-width dyed fabrics dyed by the cylinder dyeing machine need to be unwound by the unwinding machine 12 before being introduced into the fabric feeding device 1. The unwinding machine 12 evenly unfolds the flat-width dyed fabric, helping to prevent wrinkles or deformation before it enters the fabric feeding device 1, thus ensuring the flatness of the dyed fabric. Open-width dyed fabrics are directly introduced into the fabric feeding device 1 for spreading treatment. This can be freely selected according to the characteristics of the dyed fabric and production needs, improving the flexibility of fabric feeding and the adaptability of the color-fixing equipment.

[0043] Furthermore, such as Figure 1 and Figure 3 As shown, the nylon fabric color-fixing equipment also includes an immersion device 13, which is located between the color-fixing device 3 and the first receiving device 4. The immersion device 13 includes an immersion tank containing at least one of an absorbent, a softener, and an anti-yellowing agent. The dyed fabric after color fixing is immersed in the immersion tank. A third roller 14 is located upstream and downstream of the immersion tank, respectively, to remove excess water from the dyed fabric as it passes through the immersion tank. Immersion with the absorbent, softener, and anti-yellowing agent enables the dyed fabric to achieve functions such as water absorption, softening, and anti-yellowing. The third roller 14 is located before the immersion tank to remove excess water from the color-fixing solution, facilitating the absorption of the absorbent, softener, and anti-yellowing agent. The third roller 14 is located after the immersion tank to remove excess water from the absorbent, softener, and anti-yellowing agent, facilitating subsequent drying and reducing the time and energy consumption of the drying process.

[0044] Furthermore, such as Figure 1 and Figure 4 As shown, the nylon fabric color-fixing equipment also includes a dryer 15 and a second receiving device 16. The dryer 15 and the second receiving device 16 are sequentially arranged on the side of the first receiving device 4 away from the color-fixing device 3. The dyed fabric can pass through the first receiving device 4 into the dryer 15 for drying. The second receiving device 16 is used to remove the dyed fabric after drying in the dryer 15. The dyed fabric that has been reinforced by the soaking device 13 can selectively pass through the first receiving device 4 into the dryer 15 for qualitative and drying treatment, and then be removed using the second receiving device 16. Of course, if the dryer 15 is damaged, the dyed fabric can be removed through the first receiving device 4 to prevent the dyed fabric from accumulating in the color-fixing chamber 311 for too long due to the dryer 15 malfunction and causing fabric surface problems. For warp-knitted fabrics dyed by a warp-cylinder dyeing machine, due to the special structure of warp-knitted fabrics, the fabric is prone to leaving marks after being unloaded from the machine. Additionally, warp-knitted fabrics, which are prone to creases when dyed in a rope-like manner within the overflow cylinder, are discharged from the tail of the dryer 15 after color-fixing and drying in the color-fixing equipment, and then wound onto the fabric carriage to avoid creases during unloading. For open-width fabrics dyed by an overflow cylinder dyeing machine, after the flat-width fabric enters the nylon fabric color-fixing equipment for color-fixing and drying, the fabric is discharged from the tail of the dryer 15 and unloaded onto the fabric carriage.

[0045] like Figures 1 to 4 As shown, embodiments of the present invention also provide a nylon fabric color-fixing process, using nylon fabric color-fixing equipment, and the specific steps include: S10. Identify the type of dyed fabric and select the color-fixing method for the dyed fabric in the color-fixing box 31. S20. After the dyed fabric is flattened by the fabric feeding device 1, it is transferred to the rinsing tank 21 for washing with detergent. S30. The washed dyed fabric is passed through the second roller 11 to remove excess water and then transferred to the color-fixing box 31. S40. Choose either immersion-type or spray-type color fixing method according to the type of dyed fabric. The immersion-type color fixing method is as follows: the dyed fabric in the color fixing box 31 is patted by the fabric patting roller 10 and freely stacked on the conveyor line 32 for conveying along the first direction, and is immersed in the color fixing liquid for color fixing treatment. The spray-type color fixing method is as follows: the dyed fabric in the color fixing box 31 is sequentially wound around multiple color fixing rollers 34 arranged and rotating along the first direction and conveyed along the first direction. The color fixing liquid is sprayed onto the dyed fabric conveyed on the color fixing rollers 34 by the first spray assembly 33 for color fixing treatment. S50. After color fixing, soften, prevent yellowing and / or dry the dyed fabric before exporting and storing it.

[0046] This nylon fabric color-fixing process is simple to operate. It can produce different types of dyed fabrics according to different dyeing processes. It can choose to wrap the color-fixing roller 34 and convey it in conjunction with the first spray component 33 to spray the color-fixing liquid, or choose to stack it on the conveyor line 32 and be conveyed by the conveyor line 32 and immersed in the color-fixing liquid for color-fixing. This improves the adaptability of the dyed fabric to color-fixing under different dyeing processes, ensures the color-fixing effect of the dyed fabric, and eliminates dyeing defects such as color difference, abrasion or crease. Combined with the fabric feeding device 1 for flattening the dyed fabric, the rinsing device 2 for washing the dyed fabric, and the first receiving device 4 for exporting the dyed fabric after color-fixing, it realizes continuous production of dyed fabric by conveying and fixing, which saves time and labor and has high production efficiency.

[0047] It is worth noting that the dyed fabric is conveyed at a speed of 15-35 m / min and a fabric tension of 0.5-8.0 kg. This conveying speed is reasonable, resulting in good color fixation and high production efficiency. Tension sensors 17, namely rotating tension rollers and pressure sensors mounted on the tension rollers, are installed between adjacent devices to detect the fabric pressure at each stage of the conveying process. The fabric tension should be maintained at 0.5-8.0 kg as much as possible, and combined with the pressure of 0.2-0.5 MPa applied by each active rotating roller, this ensures that the dyed fabric is uniformly impregnated under a certain pressure in the rinsing tank 21 and the color-fixing tank 31.

[0048] Optionally, when using conveyor line 32 for color fixing, the conveyor line 32 carries the dyed fabric to be immersed in a color fixing solution with a concentration of 3-6 g / L, a temperature of 55-70℃, and a pH of 4-4.5 for 30-600 seconds. This sufficient time ensures that the color fixing solution molecules complete sufficient adsorption and cross-linking reactions on the fiber surface and inside, thereby significantly improving color fastness. Alternatively, when using color fixing roller 34 for color fixing, the first spray component 33 sprays a color fixing solution with a concentration of 3-6 g / L and a pH of 4-4.5, maintaining the dyed fabric conveyed on the color fixing roller 34 in an environment of 55-70℃ for color fixing. This temperature range is suitable and provides good wetting effect. The pH value of the color fixing solution is precisely controlled within a weakly acidic range of 4.0-4.5 to reduce the risk of hydrolysis of nylon fibers under alkaline conditions. Through the cross-linking reaction of the color fixing solution in this weakly acidic environment, the color fastness of the nylon fabric can be improved, ensuring the stability of the dyeing effect.

[0049] Furthermore, in step S10, after the dyed fabric is washed in the first rinsing tank 21, it passes through a second roller 11 to remove excess water before entering the second rinsing tank 21 for washing. After removing excess water through the second roller 11, the dyed fabric can be cleaned more evenly in the second rinsing tank 21, avoiding excessive water from affecting the rinsing effect. After washing in the first rinsing tank 21, it is further rinsed in the second rinsing tank 21 to effectively remove excess dye and impurities from the dyed fabric, ensuring the washing efficiency of the dyed fabric. Each rinsing tank 21 is equipped with a concentration detector and a dosage replenishment mechanism for replenishing the detergent concentration. The second rinsing tank 21 is continuously injected with clean water, and the clean water flow rate is controlled at 2-4 m³ / h. 3 The flow rate is 2-4 m³ / h, and the clean water from the second rinsing tank 21 can flow into the first rinsing tank 21. The second rinsing tank 21 continuously receives clean water, and the flow rate is controlled at 2-4 m³ / h. 3 The system ensures water flow and cleaning power, while the water flow design with the first rinsing tank 21 improves resource utilization efficiency, avoids excessive waste, and is energy-saving and environmentally friendly. Each rinsing tank 21 is equipped with a concentration detector to monitor the detergent concentration in real time, ensuring it is within the optimal range, preferably 1-2 g / L. The dosage replenishment mechanism can accurately replenish the required detergent concentration, maintaining the washing effect and stability during the rinsing process.

[0050] Furthermore, in step S30, before the dyed fabric is conveyed by the conveyor line 32 or the fixing roller 34 for color fixing treatment, the dyed fabric is immersed in the fixing solution in the fixing tank 31 for a pre-fixing treatment. This pre-fixing treatment before the dyed fabric enters the conveyor line 32 or the fixing roller 34 helps to fix the dye in advance, enhances the color fastness of the dyed fabric, reduces dye loss in subsequent processing, and ensures that the fabric color is more stable and less prone to fading. Optionally, after the dyed fabric is conveyed by the conveyor line 32 or the fixing roller 34 for color fixing treatment, the dyed fabric is immersed again in the fixing solution in the fixing tank 31 for a reinforced color fixing treatment. This second immersion after the initial color fixing treatment further improves the color fastness of the dyed fabric, making the color more vibrant and longer-lasting.

[0051] In addition, after color fixing, the dyed fabric enters the soaking tank. The fabric is still transported at a speed of 15-35 m / min, the temperature inside the soaking tank is 50℃, the pressure of the pressure rollers inside the soaking tank is maintained at 0.3-0.5 MPa, and the water flow rate is 1 m³ / min. 3 / h, pH 4-4.5, prepare functional additives at a concentration of 3g / L. Functional additives can be selected from absorbents, softeners, anti-yellowing agents, etc.

[0052] The technical solution of the present invention will be further described in detail below through embodiments.

[0053] Example 1: Open-width nylon elastic fabric dyed using a shaft-type dyeing machine: 75% nylon, 25% spandex, black. After being unwound by the unwinding machine, the fabric is conveyed at a speed of 15m / min and a surface tension of 2.5kg. After being washed in detergent at 60℃, it is conveyed to the color-fixing chamber 311 at 70℃ and subjected to color-fixing liquid immersion treatment on the color-fixing roller 34 for 80s. Example 2: Open-width nylon elastic fabric dyed by overflow dyeing machine: 75% nylon, 25% spandex, black.

[0054] After being unwound by the unwinding machine, the fabric is conveyed at a speed of 15m / min and a surface tension of 2.5kg. After being washed in detergent at 60℃, it is conveyed to the color-fixing chamber 311 at 70℃ and then stacked on the conveyor line 32 for 300s of color-fixing liquid immersion treatment. Testing revealed that the fabric's dyeability meets customer requirements, with no color difference between the front and back or left and right sides. The strength of the dyed fabric is indistinguishable from the greige fabric. The fabric's hand feel, after qualitative testing, meets customer requirements.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A nylon fabric color-fixing device, characterized in that, include: Fabric feeding device, used to receive and flatten dyed fabric; A rinsing device is located downstream of the fabric feeding device and is used to wash the flattened dyed fabric. A color-fixing device, located downstream of the rinsing device, includes a color-fixing box, a conveyor line, a conveying assembly, and a first spray assembly. The color-fixing box contains a color-fixing chamber filled with a color-fixing liquid. The conveyor line is also located within the color-fixing chamber and is positioned below the surface of the color-fixing liquid for conveying the dyed fabric along a first direction. The conveying assembly includes a first drive and multiple color-fixing rollers. The multiple color-fixing rollers are arranged along the first direction and rotatably disposed within the color-fixing chamber. The rotation axis of each color-fixing roller extends along a second direction. The first drive drives the color-fixing rollers to rotate along their own rotation axis. The color-fixing rollers are spaced above the surface of the color-fixing liquid for conveying the dyed fabric along the first direction. The first spray assembly is positioned above the color-fixing rollers and sprays the color-fixing liquid onto the dyed fabric conveyed on the color-fixing rollers. The conveyor line and the conveying assembly are selectively used to convey the dyed fabric. The first direction is perpendicular to the second direction. The first receiving device is located downstream of the color-fixing device and is used to extract the dyed fabric after color fixing in the color-fixing device.

2. The nylon fabric color-fixing equipment according to claim 1, characterized in that, The color-fixing box is further provided with an inlet and an outlet communicating with the color-fixing cavity. The inlet and outlet are respectively located on both sides of the color-fixing box along the first direction. The color-fixing device further includes a first drive roller and a first guide roller disposed within the color-fixing cavity, with the first drive roller and the first guide roller disposed adjacent to the inlet. The first drive roller is located below the surface of the color-fixing liquid, and the first guide roller is located above the surface of the color-fixing liquid. The washed dyed fabric is sequentially conveyed around the first drive roller and the first guide roller to the conveyor line or the color-fixing roller; and / or, The color-fixing device further includes a second drive roller and a second guide roller disposed in the color-fixing cavity, and the second drive roller and the second guide roller are disposed adjacent to the discharge port. The second drive roller is located below the liquid surface of the color-fixing liquid, and the second guide roller is located above the liquid surface of the color-fixing liquid. The dyed fabric, after being conveyed by the color-fixing roller or the conveyor line, is sequentially conveyed around the second guide roller and the second drive roller and then discharged from the discharge port.

3. The nylon fabric color-fixing equipment according to claim 2, characterized in that, The color-fixing device further includes a first rolling mill, which is disposed between the first guide roller and the conveying assembly. The first rolling mill is used to remove excess moisture from the dyed fabric between the first guide roller and the conveying assembly.

4. The nylon fabric color-fixing equipment according to claim 2, characterized in that, The color-fixing device further includes a first rolling mill, which is disposed between the conveying assembly and the second guide roller. The first rolling mill is used to remove excess moisture from the dyed fabric between the conveying assembly and the second guide roller.

5. The nylon fabric color-fixing equipment according to claim 2, characterized in that, The color-fixing device further includes a second driving member and a fabric-tapping roller. The fabric-tapping roller is disposed between the first guide roller and the conveyor line. The fabric-tapping roller is rotatably connected to the cavity wall of the color-fixing chamber, and the rotation axis of the fabric-tapping roller extends along the second direction. Multiple corrugated portions are spaced apart on the outer periphery of the fabric-tapping roller. The second driving member is used to drive the fabric-tapping roller to rotate, so that the corrugated portions tap the dyed fabric between the first guide roller and the conveyor line.

6. The nylon fabric color-fixing equipment according to claim 1, characterized in that, The outer circumferential surface of the fixing roller is provided with a plurality of fixing grooves at intervals, and the first spraying assembly can spray the fixing liquid into the fixing grooves; and / or The two adjacent color-fixing rollers are staggered in the vertical direction, which is perpendicular to the first direction and the second direction, respectively.

7. The nylon fabric color-fixing device according to any one of claims 1 to 6, characterized in that, The rinsing device includes at least one rinsing tank containing detergent. The rinsing tank also contains a third guide roller and a roller. The third guide roller is located below the surface of the detergent, and the roller is located above the surface of the detergent. The dyed fabric is sequentially conveyed around the third guide roller and the roller. A second spray assembly is also provided above the roller, which sprays the detergent onto the dyed fabric conveyed on the roller for cleaning.

8. The nylon fabric color-fixing equipment according to claim 7, characterized in that, The rinsing device is provided with two rinsing tanks, namely a first rinsing tank and a second rinsing tank. The first rinsing tank is located adjacent to the fabric feeding device, and the second rinsing tank is provided with a drain outlet, which communicates with the first rinsing tank; and / or, A second roller is located behind the rinsing tank, away from the fabric feeding device. The second roller is used to remove excess water from the dyed fabric after rinsing.

9. The nylon fabric color-fixing device according to any one of claims 1 to 6, characterized in that, It also includes an unwinding machine, through which the dyed fabric of the flat width is unwound and introduced into the fabric feeding device; and / or, The dyed fabric with an open width is directly introduced into the fabric feeding device.

10. The nylon fabric color-fixing device according to any one of claims 1 to 6, characterized in that, It also includes an immersion device, which is disposed between the color-fixing device and the first receiving device. The immersion device includes an immersion tank containing at least one of an absorbent, a softener, and an anti-yellowing agent. The dyed fabric, after color fixing, is immersed in the immersion tank. A third roller is disposed upstream and downstream of the immersion tank, respectively, to remove excess moisture from the dyed fabric as it passes through the immersion tank. And / or, It also includes a dryer and a second receiving device. The dryer and the second receiving device are arranged sequentially on the side of the first receiving device away from the color fixing device. The dyed fabric can pass through the first receiving device into the dryer for drying. The second receiving device is used to export the dyed fabric after it has been dried by the dryer.

11. A color-fixing process for nylon fabric, characterized in that, The specific steps of using the nylon fabric color-fixing device according to any one of claims 1 to 10 include: S10. Identify the type of dyed fabric and select the color-fixing method for the dyed fabric in the color-fixing box; S20. The dyed fabric is flattened by the fabric feeding device and then conveyed to the rinsing tank for washing with detergent. S30. The washed dyed fabric is passed through a second roller to remove excess water, and then transferred to the color-fixing box. S40. Select either an immersion-type color-fixing method or a spray-type color-fixing method according to the type of dyed fabric. The immersion-type color-fixing method is as follows: the dyed fabric in the color-fixing box is patted by the fabric-patting roller and freely stacked on the conveyor line for conveying along the first direction, and is immersed in the color-fixing liquid for color-fixing treatment. The spray-type color-fixing method is as follows: the dyed fabric in the color-fixing box is sequentially wound around multiple color-fixing rollers arranged and rotating along the first direction and conveyed along the first direction; the color-fixing liquid is sprayed onto the dyed fabric conveyed on the color-fixing rollers by the first spray assembly for color-fixing treatment. S50. After color fixing, the dyed fabric is softened, protected against yellowing, and / or dried before being exported and stored.

12. The nylon fabric color-fixing process according to claim 11, characterized in that, The dyed fabric is conveyed at a speed of 15-35 m / min and a fabric tension of 0.5-8.0 kg.

13. The nylon fabric color-fixing process according to claim 11, characterized in that, When the fabric is conveyed for color fixing using the conveyor line, the conveyor line immerses the dyed fabric in a color fixing solution with a concentration of 3-6 g / L, a temperature of 55-70℃, and a pH of 4-4.5 for 30-600 seconds; or when the fabric is conveyed for color fixing using the color fixing roller, the first spray component sprays a color fixing solution with a concentration of 3-6 g / L and a pH of 4-4.5, and the dyed fabric conveyed on the color fixing roller is kept in an environment of 55-70℃ for color fixing.

14. The nylon fabric color-fixing process according to claim 11, characterized in that, In step S10, after the dyed fabric is washed in the first rinsing tank, it passes through a second rolling mill to remove excess water before entering the second rinsing tank for washing. Each rinsing tank is equipped with a concentration detector and a dosage replenishment mechanism for replenishing the detergent concentration. The second rinsing tank is continuously filled with clean water, and the flow rate of the clean water is controlled at 2-4 m³ / h. 3 / h, and the clean water in the second rinsing tank can flow into the first rinsing tank.

15. The nylon fabric color-fixing process according to claim 11, characterized in that, In step S30, before the dyed fabric is conveyed by the conveyor line or the fixing roller for color fixing treatment, the dyed fabric is immersed in the color fixing solution in the color fixing tank once for pre-color fixing treatment; and / or, After the dyed fabric is conveyed by the conveyor line or the color-fixing roller for color-fixing treatment, the dyed fabric is immersed again in the color-fixing liquid in the color-fixing box for enhanced color-fixing treatment.

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