Dyeing process of high capacity non-tension regenerated cellulose fibre yarn

Abstract

This invention belongs to the field of textile dyeing technology, specifically relating to a dyeing process for large-capacity tension-free regenerated cellulose fiber yarns. It is implemented using a zero-color-difference yarn star cage dyeing device. First, the regenerated cellulose fiber yarn is wound into tension-free yarn bundles. Then, a tension-free yarn bundle pressing machine is used for a pre-swelling pressing process, controlling the yarn density to 0.28-0.32 g / cm³. 3 The yarn is then transferred to a zero-color-difference yarn dyeing device for pretreatment, dyeing, post-treatment, and drying. In this invention, a yarn pressing process is added during the dyeing of regenerated cellulose fibers using the zero-color-difference yarn dyeing device. This effectively controls the swelling rate of the tension-free yarn bundle, preventing uneven dyeing and strength reduction caused by excessively low or high swelling. A specially designed tension-free yarn bundle pressing machine is used for this step, ensuring precise and controllable pressing. The optimal pressing density range has been determined through multiple experiments, ensuring high-quality dyeing in the subsequent process.

Description

Technical Field

[0001] This invention belongs to the field of textile dyeing technology, specifically relating to the dyeing process of high-capacity tension-free regenerated cellulose fiber yarn. Background Technology

[0002] Lyocell, Modal, viscose, and other regenerated cellulose fibers are widely used in high-end underwear, home furnishing fabrics, and other fields due to their moisture absorption, breathability, softness, and skin-friendly properties. However, these fibers are rich in hydroxyl groups in their molecular chains, making them prone to absorbing moisture and swelling during dyeing, leading to two major problems: First, after fiber swelling, the density difference between the inner and outer layers of loose-pack yarn is significant. In traditional package yarn dyeing, the dye liquor flows along the low-resistance path, easily resulting in darker outer layers and lighter inner layers, or localized color spots. The layer difference grade of pure spun yarn is often lower than grade 3, and the problem of uneven porosity is even more pronounced in blended yarns due to the different swelling rates of different fibers. Second, the sudden increase in dye liquor flow resistance leads to insufficient uniformity, and high swelling reduces the interfiber gaps. The density of loose-pack yarn before swelling is usually greater than or equal to 0.38 g / cm³. 3 In existing technologies, textile companies typically increase the length of the bobbin and reduce the thickness of the yarn winding when dyeing regenerated cellulose fibers. This prevents companies from achieving mass production. They also extend the dyeing time, resulting in uneven dye distribution within the fiber and significantly reducing production efficiency. After dyeing, some yarns with large color differences need to be discarded, leading to low yield, extremely high production costs, and wet rubbing fastness often below grade 4, which cannot meet the needs of high-end fabrics.

[0003] In existing technologies, improvements to dyeing regenerated cellulose fibers mostly focus on optimizing dyes or auxiliaries. Patent CN107964812A improves the scouring effect through tea saponin pretreatment, but it cannot improve the blockage of seepage channels caused by swelling. Although the yarn zero-color-difference star cage dyeing device disclosed in patent CN119900138A can achieve zero-color-difference dyeing of conventional fibers, it is not designed for the characteristics of highly swollen fibers. Under tension-free conditions, highly swollen fibers swell uncontrollably, easily forming uneven excessive swelling. This uneven swelling results in uneven yarn density, which in turn leads to uneven dyeing flow and easily causes problems such as uneven dyeing or layer differences.

[0004] The zero-color-difference star cage dyeing device disclosed in patent CN119900138A requires the tension-free regenerated cellulose fiber yarns dyed individually to be removed, stretched, and placed on a multi-column centrifugal dewatering machine for dehydration before drying. This significantly increases labor costs and is inefficient. The dyed tension-free regenerated cellulose fiber yarns become stiff and flat, making them difficult to stretch and prone to wear. Furthermore, the overflow holes on the star tube at the center of the star cage in the zero-color-difference star cage dyeing device generate extremely high water column impact force during high-lift, high-flow-rate working liquid circulation, which can damage the yarn. Since regenerated cellulose fibers have high swelling properties and are difficult to fully dye, requiring a high-lift, high-flow-rate circulation process, this device is unsuitable for dyeing this special type of yarn.

[0005] Therefore, there is an urgent need for a large-scale dyeing process suitable for regenerated cellulose fibers with high swelling degree to fundamentally solve the dyeing pain points. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a dyeing process for high-capacity tension-free regenerated cellulose fiber yarn, which solves the problem that tension-free regenerated cellulose fiber yarn cannot be produced in large quantities with high yield.

[0007] The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn described in this invention uses the yarn zero-color-difference star cage dyeing device disclosed in patent CN119900138A to perform the following steps:

[0008] A. Yarn pre-swelling

[0009] Regenerated cellulose fiber yarn is wound into tension-free yarn bundles, which are then layered and placed inside a star cage. Once filled, a star cage yarn frame is formed. Several overflow holes are located on the star tube at the center of the star cage, and a flow-stabilizing mesh is installed inside the star tube. The aperture of the flow-stabilizing mesh is smaller than that of the overflow holes. The filled star cage is then transferred to a tension-free yarn bundle pressing machine for a pre-swelling pressing process. The pressing mechanism compresses the placed tension-free yarn bundles downwards while simultaneously adding water to the tension-free yarn bundle pressing machine for swelling. The tension-free yarn bundle pressing machine controls the yarn density within the star cage to be 0.28-0.32 g / cm³. 3 The mass used in the calculation of yarn density is the total mass of the filled yarn bundle, and the volume is the final height of the yarn after being compacted by the tensionless yarn bundle presser × the bottom area.

[0010] This invention strictly controls the yarn density after pressing to be 0.28-0.32 g / cm³. 3 When the density is too high, the swelling is too low, resulting in high resistance during dyeing and easy layer difference. When the density is too low, the swelling is too high, and the yarn swells unevenly without control, which leads to uneven dyeing flow and results in dyeing spots or layer difference.

[0011] B. Preprocessing

[0012] After the star cage and the tension-free yarn bundle inside are compacted and fixed by the compression sealing device, they are transferred to the main cylinder of the dyeing machine of the yarn zero color difference star cage dyeing device. After sealing, the working liquid circulation method is used for treatment: start the circulation pump, pump the pretreatment working liquid into the star cage through the circulation pipeline, and circulate it back and forth in the main cylinder of the dyeing machine to complete the pretreatment process, and then perform water washing.

[0013] C. Staining

[0014] The dyeing working solution is pumped into the star tube by the circulation pump and circulation pipeline, and then circulated repeatedly in the main cylinder of the dyeing machine for dyeing, followed by color fixing.

[0015] D. Post-processing

[0016] Water, soaping, and softening working solution are sequentially pumped into the star tube via a circulation pump and circulation pipeline for water washing, soaping, and softening treatment.

[0017] E. Drying

[0018] After post-processing, the star cover and the tension-free yarn bundle inside are removed from the main cylinder of the dyeing machine. The compacted tension-free yarn bundle is removed, placed in a dewatering machine for dewatering, and then placed in a dryer for drying.

[0019] F. Tight winding

[0020] After being dried, the tension-free yarn bundle is evenly supported by the telescopic yarn support frame and then installed on the active unwinding bobbin shaft of the automatic unwinding winding machine for tight winding.

[0021] The star cage yarn frame described in step A is as described in patent CN119900138A: a lifting device is used to suspend the ring-shaped lifting structure of the cross chain, the disassembly buckle below the suspension chain hooks the lifting ring of the yarn bundle grate, the yarn bundle grate is lifted horizontally, and tension-free yarn bundles are placed layer by layer around the center ring on the yarn bundle grate; the sealing gasket is passed through the star tube and pressed onto the star cage yarn frame seat, and then the filled yarn bundle grate is passed through the star tube and placed on the sealing gasket. The lifting nut is fixedly connected to the center rod by the thread. After assembly, the star cage yarn frame is obtained.

[0022] This invention incorporates a flow stabilizing mesh inside the star tube. The mesh's aperture is smaller than that of the overflow hole. Specifically, a flow stabilizing mesh with a diameter of φ1mm-φ2mm is welded and installed inside the φ4mm×20mm overflow hole of the star tube's central rod. This transforms the single flow rate ejected from the overflow hole during the dyeing process into multiple dispersed flow rates. This ensures that the water column output flow rate from the overflow hole pump remains constant while the impact force is dispersed and reduced, effectively solving quality problems such as strength, fiber damage, and scattering that occur during the dyeing process of regenerated cellulose fiber yarn.

[0023] The tensionless yarn bundle pressing machine described in step A includes: a pressing drum for accommodating a star cage yarn frame containing yarn, a pressing mechanism above the pressing drum, the pressing mechanism including a two-stage telescopic cylinder driven by a hydraulic station, a pressing assembly telescopically connected below the two-stage telescopic cylinder, the pressing mechanism being mounted on a rotating gantry above the pressing drum, and the pressing drum being equipped with a water circulation system.

[0024] Furthermore, the outer cylinder wall of the star cage yarn frame is covered with overflow holes, and the inside is filled with yarn bundles.

[0025] Furthermore, the yarn pressing assembly includes a primary pressure shaft, a secondary pressure shaft, a yarn pressing hole rod, and a pressure cap connected sequentially from top to bottom. When the secondary telescopic cylinder is activated, it drives the primary and secondary pressure shafts to extend sequentially, jointly driving the yarn pressing hole rod to move downwards. The pressure cap is used to directly contact the yarn and apply pressure.

[0026] Furthermore, the rotating gantry frame rotates via a rotary bearing, used to move the yarn pressing mechanism to the center position of the yarn pressing drum or to move it away. The rotating gantry frame is also equipped with a safety lock to lock the rotating gantry frame after the yarn pressing mechanism is positioned, preventing it from rotating during operation.

[0027] Furthermore, the water circulation system includes an inlet pipe and a return pipe connected to the pressing drum, and the inlet pipe and the return pipe are connected to a recycling water tank.

[0028] Furthermore, the water inlet pipe is equipped with a water inlet pump and a water inlet valve to control the water supply to the pressing drum; the return pipe is equipped with a drain valve to control the drainage from the pressing drum to the recycling pool.

[0029] Furthermore, the hydraulic station is connected to the secondary telescopic cylinder via an oil pipe to provide hydraulic power to the yarn pressing mechanism.

[0030] Furthermore, the bottom of the yarn pressing barrel is provided with a base.

[0031] Working Principle: A crane lifts the yarn frame into the pressing barrel. A rotating bearing drives a rotating gantry frame to the center position of the yarn frame, locking the safety lock. The hydraulic station provides hydraulic pressure through oil pipes to the secondary telescopic cylinder, causing it to extend the primary pressure shaft. Once in position, the secondary pressure shaft extends, driving the pressing hole rod to press the yarn bundle perpendicularly to the pressure cover, pressing it to the required density depth. During pressing, the water pump is activated, and water is introduced through the inlet pipe and opened. Simultaneously, water soaks the yarn, ensuring it fully swells. After pressing, the drain valve is opened, and the water in the pressing barrel flows back to the recycling tank through the return pipe. The water in the recycling tank is then reused. After the yarn pressing is completed, unscrew the lifting nut, pass the yarn bundle cap through the star tube and press it onto the placed tension-free yarn bundle. Then, select the length of the blind tube according to the filling height of the tension-free yarn bundle and press it onto the yarn bundle cap. Then, connect the cap, locking nut and lifting nut to the center rod in sequence through threads to fix the tension-free yarn bundle after yarn pressing, swelling and shaping. Transfer it to the main cylinder of the dyeing machine of the yarn zero color difference star cage dyeing device for the next process.

[0032] The time for the yarn pre-swelling process in step A is 10-20 minutes.

[0033] In step A, after winding the regenerated cellulose fiber yarn into tension-free yarn bundles, each tension-free yarn bundle is wrapped with a polypropylene sock, and then filled layer by layer. This invention improves the pure cotton knitted socks with polypropylene socks. Polypropylene does not dye during the dyeing process and can be reused, while the previously used pure cotton knitted socks cannot be reused multiple times.

[0034] The pretreatment working solution in step B consists of refining agent SA-E: 1.5-2 g / L, 27.5 wt.% hydrogen peroxide 3-4 g / L, stabilizer (disodium ethylenediaminetetraacetate) 0.8-1 g / L, and sodium hydroxide at 48 Baume degrees 2-4 g / L. The pretreatment process takes 30-60 minutes and is carried out at a temperature of 95-100°C. The temperature is controlled to be lower than that of conventional fibers to avoid excessive swelling.

[0035] The water washing in step B is performed using a working solution of hydrogen peroxide enzyme EZ-B: 0.1-0.2 g / L, and acetic acid is added to adjust the pH to 6-7.

[0036] The dyeing working solution described in step C is a reactive dye with a concentration of 0.5-5% owf, a leveling agent LA-R of 1-1.5 g / L, and urea of ​​5-8 g / L, with a liquor ratio of 1:6-10.

[0037] The dyeing process described in step C involves heating the temperature to 50-85℃ at a rate of 0.5-1℃ / min and holding it at that temperature for 10-15 minutes.

[0038] The color-fixing step C specifically involves adding 8-12 g / L of soda ash at a uniform rate over 30 minutes, followed by heat preservation for 35-45 minutes.

[0039] In steps B, C, and D, the power of the circulating pump is 80-85% of its rated power, and the pressure difference between the inlet and outlet of the circulating pump is controlled at 0.8-1.5 Bar. After adding soda ash for color fixing in step C, the power of the circulating pump is adjusted to 83-88% of its rated power.

[0040] The reciprocating cycle described in steps B and C alternates between an inner-to-outer cycle and an outer-to-inner cycle. Specifically, the ratio of the inner-to-outer cycle time to the outer-to-inner cycle time is 4:6.

[0041] The specific flow rate of the working fluid in the main cylinder of the dyeing machine described in steps B and C is 20-25 L / (kg·min).

[0042] Step D involves adding nonionic soaping agent WO-FZ: 1-1.2 g / L and treating at 80-85℃ for 10-12 minutes. The soaping temperature is lower than that of conventional processes to reduce damage from strong forces.

[0043] The softening process described in step D involves adding cationic softener LUM: 2-3% owf and treating at 50-55℃ for 15-30 minutes.

[0044] The dryer mentioned in step E is an RF dryer, with a drying time of 90-120 minutes. The RF dryer heats both the inside and outside of the yarn simultaneously, ensuring uniform drying and preventing color shift caused by fiber shrinkage.

[0045] Step E, specifically removing the compacted tension-free yarn bundle, involves removing the entire compacted tension-free yarn bundle from the yarn bundle grate and placing it in a bag. Then, all the tension-free yarn bundles enclosed in the bag are placed in a single-cylinder centrifuge for centrifugal dehydration. Tension-free yarn bundles not pressed by a tension-free yarn bundle presser are loose after dyeing with a zero-color-difference yarn dyeing device and cannot be removed directly as a whole; they must be removed one by one, which is very labor-intensive. However, tension-free yarn bundles compacted by a tension-free yarn bundle presser have a compact structure and can be directly pushed down and removed as a whole. Simply place a yarn hopper at the bottom in the direction of the push, cover the yarn hopper with a cloth bag, push the tension-free yarn bundle down into the cloth bag in the yarn hopper, and then place it directly into the single-cylinder centrifuge for dehydration. This avoids the tedious unloading of individual tension-free yarn bundles and eliminates the need to individually unfold and place them on a multi-column centrifugal dehydrator, greatly saving production steps.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] (1) In the process of dyeing regenerated cellulose fibers using the zero color difference star cage dyeing device, the present invention adds a yarn pressing process, which can effectively control the swelling rate of the tensionless yarn bundle, prevent uneven dyeing and strength reduction caused by excessively low or high swelling. A tensionless yarn bundle pressing machine is specially designed to implement this step, making the yarn pressing process precise and controllable. The optimal yarn pressing density range is obtained through multiple experiments to ensure the implementation of high-quality dyeing in the future.

[0048] (2) The tensionless yarn bundle pressing machine of the present invention adopts a rotating gantry structure, which facilitates the hoisting in and out of the star cage yarn frame and provides a large operating space; the design of the two-stage telescopic cylinder provides sufficient and segmented controllable pressure stroke, which can adapt to the compaction requirements of different loads; the safety lock provides reliable safety protection for high-pressure operations. The entire equipment has a high degree of automation, a clear operation process, and is easy to apply in industrial applications.

[0049] (2) Dyeing regenerated cellulose fibers requires high head and large flow rate to overcome high swelling resistance and ensure dye penetration, but the fibers themselves have low wet mechanical strength and cannot withstand high impact. The present invention has a flow stabilizing net inside the star tube. The aperture of the flow stabilizing net is smaller than that of the overflow hole, so that the single flow rate sprayed from the overflow hole during the dyeing process becomes multiple dispersed flow rates. This ensures that the water column output flow rate from the overflow hole pump remains unchanged, while the impact force is dispersed and reduced. This effectively solves the quality problems such as strength, fiber damage, and scattering that occur during the dyeing process of regenerated cellulose fiber yarn, and enables the zero color difference star cage dyeing device for yarn to be successfully applied to this special variety of regenerated cellulose fiber.

[0050] (3) This invention uses a tensionless yarn bundle pressing machine to compact the tensionless yarn bundle, making its structure compact. This allows for the entire bundle to be quickly pushed down from the device and placed into a dewatering bag, which greatly saves manpower compared to the method of manually removing loose yarn bundles one by one. At the same time, the compacted whole bag of yarn bundles can be directly sent to a single-cylinder centrifuge for dewatering, avoiding the cumbersome process of manually opening each bundle and dewatering it on a multi-column centrifuge, which significantly simplifies the production process and improves efficiency.

[0051] (4) The present invention improves the pure cotton knitted socks to polypropylene socks. Polypropylene does not dye during the dyeing process and can be reused, while the pure cotton knitted socks used in the early stage cannot be reused multiple times.

[0052] (5) After adding soda ash for color fixing, the power of the circulation pump needs to be adjusted to 83-88% of the rated power. After adding more soda ash for color fixing, the pH of the dye solution will change suddenly, which will lead to an increase in viscosity. Increasing the power is beneficial to stabilizing the pressure difference between the inlet and outlet of the circulation pump, so that color fixing and dyeing can be carried out uniformly.

[0053] (6) This invention achieves a synergistic system by controlling the pressing density of the tension-free yarn bundle, optimizing the circulation power, and distributing the dye solution. The pre-pressing density creates a uniform and controllable dye liquor channel, while the optimized power and distribution parameters ensure that the dye liquor can achieve efficient, gentle, and uniform forced circulation penetration within this specific channel. This systematic approach of "physical determination first, followed by fluid optimization" fundamentally solves the industry problem of "incomplete dyeing, uneven dyeing" and "easy damage" of highly swollen fibers, achieving a balance of high uniformity, high fastness, and high efficiency in large-volume tension-free dyeing. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the yarn zero-color-difference star cage dyeing device according to the present invention;

[0055] Figure 2 This is a three-dimensional structural diagram of the star tube, star enclosure, star cage yarn bundle frame seat and central rod described in this invention;

[0056] Figure 3 This is an exploded structural diagram of the compression sealing device and lifting nut described in this invention.

[0057] Figure 4 This is a top view of the star tube, star enclosure, and sealing gasket described in this invention;

[0058] Figure 5 This is a top view of the yarn comb described in this invention;

[0059] Figure 6 This is a schematic diagram of the cross-shaped chain described in this invention;

[0060] Figure 7 This is a three-dimensional structural diagram of the rear end of the integrated chuck tube described in this invention;

[0061] Figure 8 This is a three-dimensional structural diagram of the front end of the integrated chuck tube described in this invention;

[0062] Figure 9 This is a perspective structural diagram of the rear end face of the integrated chuck tube described in this invention.

[0063] Figure 10 This is a perspective structural diagram of the front end face of the integrated chuck tube described in this invention.

[0064] Figure 11 This is an axial sectional view of the integrated chuck tube described in this invention.

[0065] Figure 12 This is a schematic diagram of the sock-fixing plug described in this invention;

[0066] Figure 13This is a schematic diagram of the structure of the telescopic yarn support frame described in this invention;

[0067] Figure 14 This is a front view of the adjusting slider described in this invention;

[0068] Figure 15 This is a top view of the adjusting slider described in this invention;

[0069] Figure 16 This is an enlarged schematic diagram of the overflow orifice on the star tube;

[0070] Figure 17 This is a schematic diagram of a tensionless yarn bundle pressing machine.

[0071] In the diagram: 1. Star tube; 101. Overflow hole; 102. Flow stabilizing net; 2. Star cage cover; 3. Star cage yarn bundle support; 4. Circulation pipeline; 5. Heater; 6. Circulation pump; 7. Motor; 8. Sealing gasket; 9. Cross chain; 901. Cross rod; 902. Diameter adjustment ring; 903. Suspension chain; 904. Disassembly buckle; 10. Yarn bundle grate; 1001. Lifting ring; 11. Yarn bundle cover; 12. Blind tube; 13. Cap; 14. Locking nut; 15. Lifting nut; 16. Liquid outlet pipe; 17. Dyeing machine main cylinder; 18. Center rod; 19. Main rod; 20. Tension bar; 2001. Anti-slip protrusion; 21. Fixed bracket; 22. Movable bracket; 23. Spring; 24. Fixing pin; 25. Annular sliding sleeve; 26. Adjusting slider; 26 01. Strip-shaped sliding hole; 27. Locking bolt; 28. Adjusting hole; 29. ​​Slide groove; 30. Hollow cavity; 31. Front fixed head; 32. Rear fixed head; 33. Integrated clamp tube; 34. Sock insert groove; 35. Inner fixed cylinder; 36. Arc groove; 37. Trapezoidal groove; 38. Sock tube fixing plug; 39. Drain pipe; 40. Outer cylinder; 41. Secondary telescopic cylinder; 42. Oil pipe; 43. Primary pressure shaft; 44. Secondary pressure shaft; 45. Yarn pressing hole rod; 46. Yarn pressing barrel; 47. Star cage yarn frame; 48. Hydraulic station; 49. Base; 50. Rotating gantry frame; 51. Rotating bearing; 52. Safety lock; 53. Return pipeline; 54. Drain valve; 55. Water inlet pipeline; 56. Water inlet valve; 57. Pressure cap; 58. Water pump; 59. Recycle water tank. Detailed Implementation

[0072] The present invention will be further described below with reference to the embodiments.

[0073] Unless otherwise specified, all raw materials used in the examples were commercially available.

[0074] Refining agent SA-E, Zibo Lurui Fine Chemical Co., Ltd.;

[0075] Hydrogen peroxide enzyme EZ-B, Zibo Lurui Fine Chemical Co., Ltd.;

[0076] LA-R, a leveling agent, is manufactured by Zibo Lurui Fine Chemical Co., Ltd.

[0077] Nonionic soap detergent WO-FZ, Zibo Lurui Fine Chemical Co., Ltd.;

[0078] Cationic softener LUM, Zibo Lurui Fine Chemical Co., Ltd.;

[0079] The reactive dye EVERZOL YELLOW 3RS H / C was purchased from Linyi Rainbow Dye Chemical Co., Ltd.

[0080] Reactive dye, reactive navy blue HGN, Tianjin Huanli Chemical Co., Ltd.

[0081] Device Examples

[0082] The yarn zero-color-difference star cage dyeing device: such as Figure 1-6 and Figure 16 As shown, the machine includes a main cylinder 17 for dyeing, inside which a detachable star cage dyer is installed. The star cage dyer includes a star cover 2, with a star cage yarn bundle support 3 at its bottom. A star tube 1 is vertically installed inside the star cover 2, passing through the star cage yarn bundle support 3 and correspondingly connected to the upper end of the circulation pipe 4 below the main cylinder 17. A detachable yarn bundle grate 10 is installed inside the star cover 2, passing through the star tube 1 and mounted on the star cage yarn bundle support 3. A central rod 18 is installed at the top of the star tube 1. A compression sealing device is threaded onto the center rod 18, and a lifting nut 15 is threaded onto the compression sealing device and connected to the center rod 18. The circulation pipeline 4 connects to the heater 5, the circulation pump 6, and the motor 7. The main cylinder 17 of the dyeing machine is connected to the circulation pump 6 through the liquid outlet pipe 16. The star cover 2 and the star tube 1 are provided with several overflow holes 101. The star tube 1 is provided with a flow stabilizing net 102. The diameter of the flow stabilizing net 102 is smaller than the diameter of the overflow hole 101. Specifically, the overflow hole 101 is φ4mm×20mm, and the flow stabilizing net 102 is φ2mm.

[0083] The yarn comb 10 is provided with a lifting ring 1001.

[0084] The yarn zero-color-difference star cage dyeing device also includes a cross-shaped hanging chain 9, which includes a cross rod 901, several diameter adjustment rings 902 below the cross rod 901, a ring-shaped lifting structure at the center of the cross rod 901, and a suspension chain 903, with disassembly buckles 904 at both ends of the suspension chain 903.

[0085] Depending on the diameter of the yarn bundle comb 10, the suspension chain 903 can be fastened to the diameter adjustment ring 902 at different positions to accommodate various sizes of yarn bundle combs 10.

[0086] The compression sealing device consists of, from bottom to top, a yarn bundle pressure cap 11, a blind tube 12, a cap 13, and a locking nut 14;

[0087] A sealing gasket 8 is provided between the star-shaped yarn bundle holder 3 and the yarn bundle grate 10. The sealing gasket 8 forms a seal with the yarn bundle grate 10 to prevent loss of dye liquor flow.

[0088] The circulation pipeline 4 is connected to the drain pipe 39. The drain pipe 39 is equipped with a valve, which automatically controls the discharge when it is necessary to discharge the working liquid or dyeing liquid.

[0089] The integrated clamp tube 33: as Figure 7-12 As shown, it includes an outer cylinder 40 and an inner fixed cylinder 35. The outer cylinder 40 has a smooth surface. The integrated clamp tube 33 is divided into a front end and a rear end. An annular sock-plug groove 34 is opened between the inner fixed cylinder 35 and the outer cylinder 40 at the rear end. Several arc-shaped grooves 36 are opened between the sock-plug groove 34 and the outer cylinder 40. Several trapezoidal grooves 37 are opened between the inner fixed cylinder 35 and the outer cylinder 40 at the front end.

[0090] The opening of the arc-shaped groove 36 and the trapezoidal groove 37 helps to reduce the weight of the integrated chuck tube 33 and increase the spinning speed. Before use, use a tubular knitted sock tube with open ends to cover the integrated chuck tube 33. Since the inner fixing tube 35 of the integrated chuck tube 33 is installed on the tube shaft of the loose automatic bobbin winding machine, with the rear end close to the bottom of the tube shaft, insert one end of the sock tube into the annular plug sock groove 34 for fixation, and insert the other end of the sock tube into the inner fixing tube 35. Then use the sock tube fixing plug 38 to plug the inner fixing tube 35. The sock tube fixing plug 38 is a hollow plug in the shape of a frustum. The diameter of the small diameter end of the frustum is smaller than the diameter of the inner fixing tube 35, and the large diameter end of the frustum is larger than the diameter of the inner fixing tube 35. This ensures that the sock tube is plugged and fixed at the front end of the integrated chuck tube 33. During the winding process of the loose-type winding machine, the yarn is wound to the outside of the sock tube. After the winding is completed, the two ends of the sock tube are lifted and gathered together. Then, the yarn covered by the sock tube is pulled off the integrated clamp tube 33, thus obtaining the tension-free yarn bundle covered by the sock tube. Using the sock tube to cover the tension-free yarn bundle can prevent the tension-free yarn bundle from being washed away by the working solution or dye liquor in the zero-color-difference yarn dyeing device.

[0091] The telescopic yarn support frame: as shown in the example Figure 13-15As shown, the device includes a main rod 19 with a hollow cavity 30 at its center. A front fixing head 31 and a rear fixing head 32 are located at both ends of the main rod 19. A spring 23 is installed inside the front fixing head 31, with its bottom abutting against an annular sliding sleeve 25. An adjustment hole 28 is provided on the main rod 19, and an adjustment slider 26 is located above the adjustment hole 28. A strip-shaped sliding hole 2601 is provided on the adjustment slider 26. A locking bolt 27 passes through the strip-shaped sliding hole 2601 and the adjustment hole 28 to fix the adjustment slider 26 to the main rod 19. One end abuts against the annular sliding sleeve 25. The telescopic yarn support frame also includes four tension bars 20 telescopically connected to the main rod 19. The rear fixed head 32 is connected to the tension bars 20 through the fixed bracket 21. The connection between the fixed bracket 21, the rear fixed head 32, and the tension bars 20 is hinged. The annular sliding sleeve 25 is connected to the tension bars 20 through the movable bracket 22. The movable bracket 22 and the annular sliding sleeve 25 are hinged. The tension bars 20 are provided with a sliding groove 29. The movable bracket 22 is connected to the tension bars 20 through an adjusting shaft passing through the sliding groove 29.

[0092] The spring 23 is fixed inside the front fixing head 31 by a fixing pin 24.

[0093] The tension bar 20 is provided with several anti-slip protrusions 2001.

[0094] The bottom of the adjusting slider 26 is arc-shaped and fits tightly against the main rod 19. This design prevents the adjusting slider 26 from swinging left or right or rotating, allowing it to move only up and down along the axial direction. This makes it better able to resist the annular sleeve 25, resulting in a more stable structure.

[0095] The tension bar 20 expands radially outward from the end near the rear fixing head 32 away from the main rod 19, and converges radially inward from the end near the front fixing head 31 near the main rod 19.

[0096] The tension-free yarn bundle is inserted into the tension bar 20 from the front fixed end 31. The inward converging end acts as a guide, making it easier for the tension-free yarn bundle to be inserted into the tension bar 20. The positions of the spring 23, annular sleeve 25, and adjusting slider 26 are set according to different yarn bundle diameters. The spring 23 applies an outward tension, ensuring the tension-free yarn bundle remains taut on the tension bar 20, thus facilitating the active unwinding process. As the active unwinding process progresses, the amount of yarn on the tension bar 20 decreases, and the inward pressure diminishes. The spring 23 continues to apply outward pressure, maintaining the yarn bundle in a taut state at all times.

[0097] The hollow cavity 30 of the telescopic yarn support frame main rod 19 is inserted into the active unwinding bobbin shaft of the active unwinding automatic winding machine. Preferably, it is further fixed in front with a fixing clamp to prevent it from falling off during the unwinding rotation process. During the unwinding process, the telescopic yarn support frame rotates with the active unwinding bobbin shaft. The yarn is easily slipped outward due to the axial force of the active unwinding bobbin shaft rotation. The anti-slip protrusions and the outward expansion end of the tension strip 20 can work together to prevent the yarn from slipping and falling off.

[0098] The tensionless yarn bundle pressing machine: such as Figure 17 As shown, the device includes a yarn pressing barrel 46 for accommodating a star cage yarn frame 47 containing yarn. A yarn pressing mechanism is provided above the yarn pressing barrel 46. The yarn pressing mechanism includes a two-stage telescopic cylinder 41 driven by a hydraulic station 48. A yarn pressing assembly is telescopically connected below the two-stage telescopic cylinder 41. The yarn pressing mechanism is mounted on a rotating gantry frame 50 above the yarn pressing barrel 46. The yarn pressing barrel 46 is equipped with a water circulation system.

[0099] The star cage yarn frame 47 is as described in patent CN119900138A: a lifting device is used to suspend the ring-shaped lifting structure of the cross chain 9, and the disassembly buckle 904 below the suspension chain 903 hooks the lifting ring 1001 of the yarn bundle grate 10, so that the yarn bundle grate 10 is lifted horizontally, and tension-free yarn bundles are placed layer by layer around the center ring on the yarn bundle grate 10; the sealing gasket 8 is pressed through the star tube 1 onto the star cage yarn frame base 3, and then the filled yarn bundle grate 10 is placed through the star tube onto the sealing gasket 8, and the lifting nut 15 is fixedly connected to the center rod 18 by threads. After assembly, the star cage yarn frame 47 is obtained.

[0100] Furthermore, the outer cylinder wall of the star cage yarn frame 47 is covered with overflow holes, and the inside is filled with yarn bundles.

[0101] Furthermore, the yarn pressing assembly includes a primary pressing shaft 43, a secondary pressing shaft 44, a yarn pressing hole rod 45, and a pressure cover 57 connected sequentially from top to bottom. When the secondary telescopic cylinder 41 is activated, it drives the primary pressing shaft 43 and the secondary pressing shaft 44 to extend sequentially, jointly driving the yarn pressing hole rod 45 to move downward. The pressure cover 57 is used to directly contact the yarn and apply pressure.

[0102] The yarn pressing hole rod 45 is a hollow barrel-shaped structure, and the pressing cover 57 is also a hollow annular structure. It is designed to be fitted onto the outer side of the central tube in patent CN119900138A, so that the yarn can be pressed downward.

[0103] Furthermore, the rotating gantry frame 50 is rotated via a rotating bearing 51, used to move the yarn pressing mechanism to the center position of the yarn pressing barrel 46 or to move it away. The rotating gantry frame 50 is also equipped with a safety lock 52, used to lock the rotating gantry frame 50 after the yarn pressing mechanism is positioned, preventing it from rotating during operation.

[0104] Furthermore, the water circulation system includes an inlet pipe 55 and a return pipe 53 connected to the pressing drum 46, and the inlet pipe 55 and the return pipe 53 are connected to the recycling water tank 59.

[0105] Furthermore, the water inlet pipe 55 is equipped with a water inlet pump 58 and a water inlet valve 56 for controlling the water supply to the pressing drum 46; the return pipe 53 is equipped with a drain valve 54 for controlling the drainage from the pressing drum 46 to the recycling pool 59.

[0106] Furthermore, the hydraulic station 48 is connected to the secondary telescopic cylinder 41 via an oil pipe 42 to provide hydraulic power to the yarn pressing mechanism.

[0107] Furthermore, the bottom of the yarn pressing barrel 46 is provided with a base 49.

[0108] Working principle: The overhead crane hoists the star-cage yarn frame 47 into the yarn pressing barrel 46. The rotating bearing 51 drives the rotating gantry frame 50 to rotate to the center position of the star-cage yarn frame 47, and the safety lock 52 locks. The hydraulic station 48 provides hydraulic pressure through the oil pipe 42 to the secondary telescopic cylinder 41. The secondary telescopic cylinder 41 actuates, causing the primary pressure shaft 43 to extend. After reaching its position, the secondary pressure shaft 44 extends, driving the yarn pressing hole rod 45 to press the yarn bundle perpendicularly to the pressure cover 57, pressing the yarn to the required density depth. During the yarn pressing process, the water pump 58 is turned on, and the water inlet valve 56 is opened through the water inlet pipe 55. During the yarn pressing process, water is simultaneously introduced to fully soak and saturate the yarn, allowing it to fully swell. After the yarn pressing is completed, the drain valve 54 is opened, and the water in the yarn pressing barrel 46 flows back to the recycling water tank 59 through the return pipe 53. The water in the recycling water tank 59 is recycled. After the yarn pressing is completed, unscrew the lifting nut 15, pass the yarn bundle cover 11 through the star tube 1 and press it onto the placed tension-free yarn bundle. Then, select the length of the blind tube 12 according to the filling height of the tension-free yarn bundle and press it onto the yarn bundle cover 11. Then, in sequence, connect the cap 13, locking nut 14, and lifting nut 15 to the center rod 18 through threads to fix the tension-free yarn bundle after yarn pressing, swelling and shaping. After assembly, transfer it to the main cylinder of the dyeing machine of the yarn zero color difference star cage dyeing device for the next process.

[0109] Example 1

[0110] The dyeing process for the high-capacity tension-free regenerated cellulose fiber yarn, using the apparatus described in the above-mentioned embodiments, involves the following steps:

[0111] A. Yarn pre-swelling

[0112] The 40s / 1 viscose staple fiber (40 English counts, single strand) yarn is evenly wound into a tension-free yarn bundle through the integrated chuck bobbin 33 of a soft-twist winding machine. The individual weight of the tension-free yarn bundle is 1 kg per bundle. The lifting device is used to lift the annular lifting structure of the cross lifting chain 9, and the disassembly buckle 904 below the suspension chain 903 hooks the lifting ring 1001 of the yarn bundle grate 10, and the yarn bundle grate 10 is horizontally lifted. The tension-free yarn bundle wrapped with a polypropylene sock tube is layer by layer placed around the center in a circular pattern on the yarn bundle grate 10. The placement method of the tension-free yarn bundle is staggered both horizontally and vertically, that is, in a "pin" shape. The loading rate of the tension-free yarn bundle grate 10 is 100%. The sealing gasket 8 is passed through the star tube 1 and pressed onto the star cage yarn bundle holder 3, and then the loaded yarn bundle grate 10 is passed through the star tube 1 and placed on the sealing gasket 8. The lifting nut 15 is fixedly connected to the center rod 18 by threads, and the above components are moved into the tension-free yarn bundle pressing machine through the lifting nut 15 for the pressing and pre-swelling process. The placed tension-free yarn bundle is compacted downward by the pressing mechanism, and while pressing, water is added to the tension-free yarn bundle pressing machine for swelling. The time of the pressing and pre-swelling process is 10 min, and the yarn density in the star cage of the tension-free yarn bundle pressing machine is controlled to be 0.32 g / cm 3 ;

[0113] B. Pretreatment

[0114] The lifting nut 15 is unscrewed, the yarn bundle cover 11 is passed through the star tube 1 and pressed on the placed tension-free yarn bundle, and then the length of the blind tube 12 is selected according to the loading height of the tension-free yarn bundle and pressed on the yarn bundle cover 11. Then, the cap 13, the locking nut 14, and the lifting nut 15 are fixedly connected to the center rod 18 by threads in sequence. The lifting device hooks the lifting nut 15 and places the assembled device into the main cylinder 17 of the dyeing machine. The star cage yarn bundle holder 3 is closely fitted with the circulation pipeline 4 at the bottom of the main cylinder 17 of the dyeing machine, and there is no flow loss. After sealing, the working fluid circulation method is used for treatment: start the circulation pump 6, the power of the circulation pump 6 is 85% of the rated power, and the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 1.5 Bar. The pretreatment working fluid refining agent SA-E 2 g / L, 27.5 wt.% hydrogen peroxide 4 g / L, stabilizer (disodium ethylenediaminetetraacetate) 1 g / L, and 48-degree Baume sodium hydroxide 4 g / L are pumped into the star tube 1 through the circulation pipeline 4 and reciprocally circulated in the main cylinder of the dyeing machine for treatment, specifically, circulating from the inside to the outside for 4 min and from the outside to the inside for 6 min alternately. The specific flow rate of the working fluid in the main cylinder of the dyeing machine is 20 L / (kg·min), the treatment time is 60 min, and the temperature is 95 °C. After completing the pretreatment process, then carry out water washing: use the working fluid of hydrogen peroxide enzyme EZ-B 0.2 g / L for water washing and add acetic acid to adjust the pH to 6;

[0115] C. Dyeing

[0116] The dyeing working solution, consisting of reactive dye EVERZOL YELLOW 3RS H / C (0.5% owf), leveling agent LA-R (1 g / L), and urea (5 g / L), is pumped into star tube 1 via circulation pump 6 and circulation pipeline 4. Circulation pump 6 is operated at 85% of its rated power, with the pressure difference between its inlet and outlet controlled at 1.5 Bar. The liquor ratio is 1:6. The temperature is raised to 50℃ at a rate of 0.5℃ / min, and held for 10 min. Dyeing is then performed by reciprocating circulation within the main cylinder of the dyeing machine, specifically alternating between 4 min of circulation from the inside to the outside and 6 min of circulation from the outside to the inside. The specific flow rate of the working solution in the main cylinder of the dyeing machine is 20 L / (kg·min). Then, 8 g / L of soda ash is added uniformly over 30 min. After adding soda ash, the power of circulation pump 6 is adjusted to 88% of its rated power, and then the solution is held at the temperature for 35 min for color fixation.

[0117] D. Post-processing

[0118] Water washing: 60℃ hot water is pumped into star tube 1 through circulation pump 6 and circulation pipeline 4. The power of circulation pump 6 is 85% of the rated power. The pressure difference between the inlet and outlet of circulation pump 6 is controlled at 1.5 Bar. Circulate and rinse for 10 minutes to wash away the surface floating color.

[0119] Soap washing: The soap washing working solution: nonionic soap washing agent WO-FZ: 1g / L is pumped into the star tube 1 by the circulation pump 6 and circulation pipeline 4. The power of the circulation pump 6 is 85% of the rated power, the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 1.5 Bar, the temperature is 80℃, and the heat treatment is carried out for 10 minutes.

[0120] Softening: The softening working solution: cationic softener LUM: 2% owf is pumped into the star tube 1 through the circulation pump 6 and circulation line 4. The power of the circulation pump 6 is 85% of the rated power, and the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 1.5 Bar. The treatment is carried out at 55°C for 15 min.

[0121] E. Drying

[0122] After post-processing, the star cover and the tension-free yarn bundle inside are taken out from the main cylinder of the dyeing machine. The compacted tension-free yarn bundle is completely removed from the yarn bundle grate and placed in a bag. Then, all the tension-free yarn bundles wrapped in the bag are centrifuged and dehydrated in a single-cylinder centrifuge, and then placed in an RF dryer for drying for 90 minutes.

[0123] F. Tight winding

[0124] After being dried, the tension-free yarn bundle is evenly supported by the telescopic yarn support frame and then installed on the active unwinding bobbin shaft of the automatic unwinding winding machine for tight winding.

[0125] Example 2

[0126] The dyeing process for the high-capacity tension-free regenerated cellulose fiber yarn, using the apparatus described in the above-mentioned embodiments, involves the following steps:

[0127] A. Yarn pre-swelling

[0128] 40s / 1 lyocell (40 count, single strand) yarn is evenly wound into tension-free yarn bundles using an integrated clamping bobbin 33 on a loose winding machine. Each tension-free yarn bundle weighs 1kg. Following the same procedure as in Example 1, the bundles are moved to a tension-free yarn bundle pressing machine for a pre-swelling pressing process. The pressing mechanism compresses the placed tension-free yarn bundles downwards while simultaneously adding water to the pressing machine for swelling. The pre-swelling pressing process takes 20 minutes, and the yarn density within the control box of the tension-free yarn bundle pressing machine is 0.28g / cm³. 3 ;

[0129] B. Preprocessing

[0130] Following the same procedure as in Example 1, after sealing, the pretreatment process is carried out using a working fluid circulation method: Circulation pump 6 is started, with its power at 80% of the rated power. The pressure difference between the inlet and outlet of circulation pump 6 is controlled at 0.8 Bar. The pretreatment working fluid, consisting of refining agent SA-E 1.5 g / L, 27.5 wt.% hydrogen peroxide 3 g / L, stabilizer (disodium ethylenediaminetetraacetate) 0.8 g / L, and sodium hydroxide at 48 Baume degrees 2 g / L, is pumped into star tube 1 through circulation pipeline 4 and circulated repeatedly in the main cylinder of the dyeing machine. Specifically, the circulation is alternated between 4 min from the inside to the outside and 6 min from the outside to the inside. The specific flow rate of the working fluid in the main cylinder of the dyeing machine is 25 L / (kg·min), the treatment time is 30 min, and the temperature is 100℃. After completing the pretreatment process, the machine is then washed with water: a working fluid of hydrogen peroxide enzyme EZ-B 0.1 g / L is used for washing, and acetic acid is added to adjust the pH to 7.

[0131] C. Staining

[0132] The dyeing working solution (active navy blue HGN: 5% owf, leveling agent LA-R 1.5 g / L, urea 8 g / L) is pumped into star tube 1 by circulation pump 6 and circulation pipeline 4. The power of circulation pump 6 is 80% of its rated power, the pressure difference between the inlet and outlet of circulation pump 6 is controlled at 0.8 Bar, the liquor ratio is 1:10, the temperature is raised to 85℃ at a rate of 1℃ / min, and held for 15 min. Dyeing is carried out by reciprocating circulation in the main cylinder of the dyeing machine, specifically by alternating between circulation from the inside to the outside for 4 min and circulation from the outside to the inside for 6 min. The specific flow rate of the working solution in the main cylinder of the dyeing machine is 25 L / (kg·min). Then, 12 g / L of soda ash is added uniformly over 30 min. After adding soda ash, the power of circulation pump 6 is adjusted to 83% of its rated power, and then the temperature is held for 45 min for color fixation.

[0133] D. Post-processing

[0134] Water washing: 60℃ hot water is pumped into star tube 1 through circulation pump 6 and circulation pipeline 4. The power of circulation pump 6 is 80% of the rated power. The pressure difference between the inlet and outlet of circulation pump 6 is controlled at 0.8 Bar. Circulate and rinse for 10 minutes to wash away the surface floating color.

[0135] Soap washing: The soap washing working solution: nonionic soap washing agent WO-FZ: 1.2g / L is pumped into the star tube 1 by the circulation pump 6 and circulation pipeline 4. The power of the circulation pump 6 is 80% of the rated power, the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 0.5 Bar, the temperature is 85℃, and the heat treatment is carried out for 12 minutes.

[0136] Softening: The softening working solution: cationic softener LUM: 3% owf is pumped into the star tube 1 through the circulation pump 6 and circulation line 4. The power of the circulation pump 6 is 80% of the rated power, and the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 0.8 Bar. The treatment is carried out at 50°C for 30 min.

[0137] E. Drying

[0138] After post-processing, the star cover and the tension-free yarn bundle inside are taken out from the main cylinder of the dyeing machine. The compacted tension-free yarn bundle is completely removed from the yarn bundle grate and placed in a bag. Then, all the tension-free yarn bundles wrapped in the bag are centrifuged and dehydrated in a single-cylinder centrifuge, and then dried in an RF dryer for 120 minutes.

[0139] F. Tight winding

[0140] After being dried, the tension-free yarn bundle is evenly supported by the telescopic yarn support frame and then installed on the active unwinding bobbin shaft of the automatic unwinding winding machine for tight winding.

[0141] Example 3

[0142] The dyeing process for the high-capacity tension-free regenerated cellulose fiber yarn, using the apparatus described in the above-mentioned embodiments, involves the following steps:

[0143] A. Yarn pre-swelling

[0144] 40s / 1 Modal (40 count, single strand) yarn is evenly wound into tension-free yarn bundles using an integrated clamping tube 33 of a loose winding machine. Each tension-free yarn bundle weighs 1kg. Following the same procedure as in Example 1, the bundles are moved to a tension-free yarn bundle pressing machine for a pre-swelling pressing process. The pressing mechanism compresses the placed tension-free yarn bundles downwards while simultaneously adding water to the pressing machine for swelling. The pre-swelling pressing process takes 15 minutes, and the yarn density within the control box of the tension-free yarn bundle pressing machine is 0.3g / cm³. 3 ;

[0145] B. Preprocessing

[0146] Following the same procedure as in Example 1, after sealing, the pretreatment process is carried out using a working fluid circulation method: Circulation pump 6 is started, with its power at 83% of the rated power. The pressure difference between the inlet and outlet of circulation pump 6 is controlled at 1 Bar. The pretreatment working fluid, consisting of refining agent SA-E 1.8 g / L, 27.5 wt.% hydrogen peroxide 3.5 g / L, stabilizer (disodium ethylenediaminetetraacetate) 0.9 g / L, and sodium hydroxide at 48 Baume degrees 3 g / L, is pumped into star tube 1 through circulation pipeline 4 and circulated repeatedly in the main cylinder of the dyeing machine. Specifically, the circulation is alternated between 4 min from the inside to the outside and 6 min from the outside to the inside. The specific flow rate of the working fluid in the main cylinder of the dyeing machine is 23 L / (kg·min), the treatment time is 45 min, and the temperature is 98℃. After completing the pretreatment process, the machine is then washed with water: a working fluid of hydrogen peroxide enzyme EZ-B 0.15 g / L is used for washing, and acetic acid is added to adjust the pH to 6.5.

[0147] C. Staining

[0148] The dyeing working solution (active navy blue HGN: 3% owf, leveling agent LA-R: 1.3 g / L, urea 6.5 g / L) is pumped into star tube 1 by circulation pump 6 and circulation pipeline 4. The power of circulation pump 6 is 83% of its rated power, the pressure difference between the inlet and outlet of circulation pump 6 is controlled at 1 bar, the liquor ratio is 1:8, the temperature is raised to 85℃ at a rate of 0.8℃ / min, and the temperature is maintained for 12 min. Dyeing is carried out by reciprocating circulation in the main cylinder of the dyeing machine, specifically by alternating between circulation from the inside to the outside for 4 min and circulation from the outside to the inside for 6 min. The specific flow rate of the working solution in the main cylinder of the dyeing machine is 23 L / (kg·min). Then, 10 g / L of soda ash is added uniformly over 30 min. After adding soda ash, the power of circulation pump 6 is adjusted to 87% of its rated power, and then the temperature is maintained for 40 min for color fixation.

[0149] D. Post-processing

[0150] Water washing: 60℃ hot water is pumped into star tube 1 through circulation pump 6 and circulation pipeline 4. The power of circulation pump 6 is 83% of the rated power. The pressure difference between the inlet and outlet of circulation pump 6 is controlled at 1 bar. Circulate and rinse for 10 minutes to wash away the surface floating color.

[0151] Soap washing: The soap washing working solution: nonionic soap washing agent WO-FZ: 1.1g / L is pumped into the star tube 1 by the circulation pump 6 and circulation pipeline 4. The power of the circulation pump 6 is 83% of the rated power. The pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 1 bar. The temperature is 83℃. The heat treatment is carried out for 11 minutes.

[0152] Softening: The softening working solution: cationic softener LUM: 2.5% owf is pumped into the star tube 1 by the circulation pump 6 and circulation line 4. The power of the circulation pump 6 is 83% of the rated power, and the pressure difference between the inlet and outlet of the circulation pump 6 is controlled at 1 bar. The treatment is carried out at 53°C for 22 min.

[0153] E. Drying

[0154] After post-processing, the star cover and the tension-free yarn bundle inside are taken out from the main cylinder of the dyeing machine. The compacted tension-free yarn bundle is completely removed from the yarn bundle grate and placed in a bag. Then, all the tension-free yarn bundles wrapped in the bag are centrifuged and dehydrated in a single-cylinder centrifuge, and then placed in an RF dryer for drying for 105 minutes.

[0155] F. Tight winding

[0156] After being dried, the tension-free yarn bundle is evenly supported by the telescopic yarn support frame and then installed on the active unwinding bobbin shaft of the automatic unwinding winding machine for tight winding.

[0157] Non-preferred embodiment 4

[0158] Similar to Example 1, except that in step B, the power of the circulating pump is 90% of its rated power, the pressure difference between the inlet and outlet of the circulating pump is controlled at 2.0 Bar, and the specific flow rate of the working liquid in the main cylinder of the dyeing machine is 23 L / (kg·min); in step C, the power of the circulating pump is 90% of its rated power, the pressure difference between the inlet and outlet of the circulating pump is controlled at 2.0 Bar, and after adding soda ash for color fixing, the power of the circulating pump is adjusted to 93% of its rated power; in step D, the power of the circulating pump is 90% of its rated power, and the pressure difference between the inlet and outlet of the circulating pump is controlled at 2.0 Bar.

[0159] Non-preferred embodiment 5

[0160] Similar to Example 1, except that in step B, the power of the circulating pump is 75% of its rated power, the pressure difference between the inlet and outlet of the circulating pump is controlled at 0.5 Bar, and the specific flow rate of the working liquid in the main cylinder of the dyeing machine is 18 L / (kg·min); in step C, the power of the circulating pump is 75% of its rated power, the pressure difference between the inlet and outlet of the circulating pump is controlled at 0.5 Bar, and after adding soda ash for color fixing, the power of the circulating pump is adjusted to 81% of its rated power; in step D, the power of the circulating pump is 75% of its rated power, and the pressure difference between the inlet and outlet of the circulating pump is controlled at 0.5 Bar.

[0161] Comparative Example 1

[0162] Same as Example 1, except that conventional yarn dyeing method is used.

[0163] A. Yarn loading

[0164] 40s / 1 viscose staple fiber (40 count, single strand) yarn is spun into loose cones weighing 1kg each using a loose winding machine; the density is 0.38g / cm³. 3 Ten are installed on each yarn rod and placed on the yarn rack.

[0165] B. Preprocessing

[0166] After each yarn rod is loaded with yarn, its top is fixed with a top plate. Then, the yarn rack with the yarn loaded is hoisted into the dyeing vat and fixed to the center rod of the dyeing machine with fixing screws. The base of the yarn rack is tightly fitted with the circulation pipeline at the bottom of the main cylinder of the dyeing machine, with no flow loss. The working solution circulation method is used for treatment: start the circulation pump, the circulation pump power is 95% of the rated power, and the pressure difference between the inlet and outlet of the circulation pump is controlled at 1.8 Bar. Add the pretreatment working solution containing refining agent SA-E 2g / L, 27.5wt.% hydrogen peroxide 4g / L, and stabilizer (disodium ethylenediaminetetraacetate) 1g / L. 4 g / L of sodium hydroxide at 48 Baume degrees is injected into each yarn creel (vertical perforated tube) through the circulation pipeline and circulated repeatedly in the main cylinder of the dyeing machine. Specifically, the circulation is alternated between 4 min from the inside to the outside and 6 min from the outside to the inside. The specific flow rate of the working solution in the main cylinder of the dyeing machine is 22 L / (kg·min), the treatment time is 60 min, and the temperature is 95℃ to complete the pretreatment process. Then, water washing is performed: water washing is performed with working solution of hydrogen peroxide enzyme EZ-B 0.2 g / L, and acetic acid is added to adjust the pH to 6.

[0167] C. Staining

[0168] The dyeing working solution consists of: reactive dye EVERZOL YELLOW 3RS H / C (0.5% owf), leveling agent LA-R (1 g / L), and urea (5 g / L). The circulation pump power is set to 95% of its rated power, with the pressure difference between the inlet and outlet of the circulation pump controlled at 1.8 Bar. The liquor ratio is 1:6. The temperature is increased to 50°C at a rate of 0.5°C / min, and the solution is held at this temperature for 10 min. The solution is then circulated repeatedly in the main cylinder of the dyeing machine for dyeing, specifically alternating between 4 min of circulation from the inside to the outside and 6 min of circulation from the outside to the inside. The specific flow rate of the working solution in the main cylinder of the dyeing machine is 22 L / (kg·min). Then, 8 g / L of soda ash is added uniformly over 30 min. After adding soda ash for color fixation, the power of the circulation pump is adjusted to 88% of its rated power, and the solution is held at this temperature for 35 min for color fixation.

[0169] D. Post-processing

[0170] Water washing: 60℃ hot water is pumped into each yarn rack rod (vertical perforated pipe) through the circulation pipeline. The circulation pump power is 85% of the rated power. The pressure difference between the inlet and outlet of the circulation pump is controlled at 1.8 Bar. The circulation is rinsed for 10 minutes to remove surface floating color.

[0171] Soaping: The soaping working solution: non-ionic soaping agent WO-FZ: 1 g / L is pumped into each yarn rack rod (vertical perforated tube) through the circulation pipeline. The power of the circulation pump is 85% of the rated power. The pressure difference between the inlet and outlet of the circulation pump is controlled at 1.8 Bar, the temperature is 80°C, and heat preservation treatment is carried out for 10 min;

[0172] Softening: The softening working solution: cationic softening agent LUM: 2% owf is pumped into each yarn rack rod (vertical perforated tube) through the circulation pipeline. The power of the circulation pump is 85% of the rated power. The pressure difference between the inlet and outlet of the circulation pump is controlled at 1.8 Bar, and treatment is carried out at 55°C for 15 min;

[0173] E. Drying

[0174] The post-treated cheese yarns are taken out from the main cylinder of the dyeing machine, and each cheese yarn is placed on the centrifuge yarn rod (multi-column centrifuge) for centrifugal dehydration, and then placed in a radio frequency dryer for drying, and the drying time is 90 min;

[0175] F. Compact winding

[0176] The loose cheese yarns after drying are subjected to compact winding through an active unwinding automatic winder.

[0177] Comparative Example 2

[0178] Direct loading without yarn pressing and pre-swelling:

[0179] A. Yarn loading

[0180] The 40s / 1 viscose staple fiber (40 English counts, single strand) yarns are evenly wound into a tension-free yarn bundle through the integral chuck bobbin 33 of a loose winder. The individual weight of the tension-free yarn bundle is 1 kg per piece; The lifting device is used to hold the ring lifting structure of the cross lifting chain 9, and the disassembling buckle 904 below the suspension chain 903 hooks the lifting ring 1001 of the yarn bundle grate 10, and the yarn bundle grate 10 is horizontally lifted. The tension-free yarn bundle wrapped with a polypropylene sock tube is placed layer by layer around the center in a ring shape on the yarn bundle grate 10. The placement method of the tension-free yarn bundle is staggered both horizontally and vertically, that is, in a "pin" shape. The loading rate of the tension-free yarn bundle grate 10 is 100%. The sealing gasket 8 is passed through the star tube 1 and pressed onto the star cage yarn bundle holder 3, and then the loaded yarn bundle grate 10 is passed through the star tube 1 and placed on the sealing gasket 8. The yarn bundle pressing cover 11 is passed through the star tube 1 and pressed on the placed tension-free yarn bundle. Then, according to the loading height of the tension-free yarn bundle, the length of the blind tube 12 is selected and pressed on the yarn bundle pressing cover 11. The cap 13, locking nut 14, and lifting nut 15 are sequentially fixedly connected to the center rod 18 through threads. The lifting device hooks the lifting nut 15 and places the assembled device in the main cylinder 17 of the dyeing machine. The star cage yarn bundle holder 3 is closely fitted with the circulation pipeline 4 at the bottom of the main cylinder 17 of the dyeing machine, and there is no flow loss.

[0181] The subsequent steps are the same as in Example 1.

[0182] Comparative Example 3

[0183] Same as in Example 1, except that a current stabilizing grid 102 is not installed inside the star tube.

[0184] Comparative Example 4

[0185] Same as Example 1, except that the yarn density within the control star enclosure of the tensionless yarn bundle pressing machine is 0.35 g / cm³. 3 The specific flow rate in steps B and C is 18 L / (kg·min), the pump power remains unchanged at 85%, and the pressure difference between the inlet and outlet of circulating pump 6 is 2 Bar.

[0186] Comparative Example 5

[0187] Same as Example 1, except that the yarn density within the control star enclosure of the tensionless yarn bundle pressing machine is 0.25 g / cm³. 3 The specific flow rate in steps B and C is 30 L / (kg·min), the pump power remains unchanged at 85%, and the pressure difference between the inlet and outlet of circulating pump 6 is 0.5 Bar.

[0188] The dyeing performance of the yarns obtained in the above embodiments and comparative examples was tested, and the test results are shown in Table 1:

[0189] 1. Knit socks on a knitting machine and measure the color difference between the inside and outside, as well as the color difference between individual socks.

[0190] Color difference between inside and outside: Take the inner, middle and outer parts of the loose yarn and yarn bundle of the comparative example and embodiment respectively to knit a continuous inner-middle-outer-inner knitted sock, and use a gray card to determine the level.

[0191] Individual color difference:

[0192] (1) Randomly select 6 yarn cones of different proportions and different heights on the yarn frame rods, knit them into continuous knitted socks, and use gray cards to determine the level.

[0193] (2) Randomly select 6 yarn bundles of different heights from the inner and outer layers of the embodiment and knit them into continuous knitted socks. Use a gray card to determine the level.

[0194] 2. Determine the color fastness of the dyed yarns using the gray scale.

[0195] 3. Tension reduction rate = (original yarn strength - colored yarn strength) / original yarn strength) × 100%.

[0196] Table 1 Test Results

[0197]

[0198] In summary, by pressing the yarn, the consistency of the flow rate is effectively guaranteed. By adding a flow stabilizer, the impact of the flow rate on the yarn is reduced, further reducing the strength reduction rate. By controlling the pump speed, a pump speed of 80-85% effectively guarantees the flow rate, avoiding excessive pump speed causing strong damage to the yarn due to excessive impact, and avoiding insufficient pump speed causing differences between the inner and outer layers.

Claims

1. A dyeing process for high-capacity tension-free regenerated cellulose fiber yarn, characterized in that, The following processes are performed using a zero-color-difference yarn dyeing apparatus: A. Yarn pre-swelling Regenerated cellulose fiber yarn is wound into tension-free yarn bundles, which are then layered and placed inside a star cage. Once filled, a star cage yarn frame is formed. Several overflow holes are located on the star tube at the center of the star cage, and a flow-stabilizing mesh is installed inside the star tube. The aperture of the flow-stabilizing mesh is smaller than that of the overflow holes. The filled star cage is then transferred to a tension-free yarn bundle pressing machine for a pre-swelling pressing process. The pressing mechanism compresses the placed tension-free yarn bundles downwards while simultaneously adding water to the tension-free yarn bundle pressing machine for swelling. The tension-free yarn bundle pressing machine controls the yarn density within the star cage to be 0.28-0.32 g / cm³. 3 ; B. Preprocessing After the star cage and the tension-free yarn bundle inside are compacted and fixed by the compression sealing device, they are transferred to the main cylinder of the dyeing machine of the yarn zero color difference star cage dyeing device. After sealing, the working liquid circulation method is used for treatment: start the circulation pump, pump the pretreatment working liquid into the star cage through the circulation pipeline, and circulate it back and forth in the main cylinder of the dyeing machine to complete the pretreatment process, and then perform water washing. C. Staining The dyeing working solution is pumped into the star tube by the circulation pump and circulation pipeline, and then circulated repeatedly in the main cylinder of the dyeing machine for dyeing, followed by color fixing. D. Post-processing Water, soaping, and softening working solution are sequentially pumped into the star tube via a circulation pump and circulation pipeline for water washing, soaping, and softening treatment. E. Drying After post-processing, the star cover and the tension-free yarn bundle inside are removed from the main cylinder of the dyeing machine. The compacted tension-free yarn bundle is removed, placed in a dewatering machine for dewatering, and then placed in a dryer for drying. After winding the regenerated cellulose fiber yarn into tension-free yarn bundles as described in step A, each tension-free yarn bundle is wrapped with a polypropylene stocking and then filled layer by layer. The dyeing process in step C involves heating to 50-85℃ at a rate of 0.5-1℃ / min and holding at that temperature for 10-15min. The color-fixing process in step C specifically involves adding 8-12g / L of soda ash at a uniform rate over 30min, followed by holding at that temperature for 35-45min. The power of the circulating pump in steps B, C, and D is 80-85% of its rated power, and the pressure difference between the inlet and outlet of the circulating pump is controlled at 0.8-1.5 Bar. After adding soda ash for color fixing in step C, the power of the circulating pump is adjusted to 87-88% of its rated power. The specific flow rate of the working fluid in the main cylinder of the dyeing machine described in steps B and C is 20-25 L / (kg·min).

2. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The tensionless yarn bundle pressing machine described in step A includes: a pressing drum for accommodating a star cage yarn frame containing yarn, a pressing mechanism above the pressing drum, the pressing mechanism including a two-stage telescopic cylinder driven by a hydraulic station, a pressing assembly telescopically connected below the two-stage telescopic cylinder, the pressing mechanism being mounted on a rotating gantry above the pressing drum, and the pressing drum being equipped with a water circulation system.

3. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The time for the yarn pre-swelling process in step A is 10-20 minutes.

4. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The pretreatment working solution in step B consists of 1.5-2 g / L refining agent, 3-4 g / L hydrogen peroxide, 0.8-1 g / L stabilizer, and 2-4 g / L sodium hydroxide. The pretreatment process takes 30-60 minutes and is carried out at a temperature of 95-100°C.

5. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The water washing in step B is performed using a working solution containing 0.1-0.2 g / L hydrogen peroxide enzyme, and the pH is adjusted to 6-7 by adding acid; the dyeing working solution in step C is composed of reactive dye: concentration 0.5-5% owf, leveling agent: 1-1.5 g / L, urea 5-8 g / L, and a liquor ratio of 1:6-10.

6. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The reciprocating cycle described in steps B and C alternates between an inner-to-outer cycle and an outer-to-inner cycle.

7. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, The dryer mentioned in step E is an RF dryer with a drying time of 90-120 minutes.

8. The dyeing process for high-capacity tension-free regenerated cellulose fiber yarn according to claim 1, characterized in that, Step E, which involves removing the compacted tension-free yarn bundle, specifically involves removing the entire compacted tension-free yarn bundle from the yarn bundle grate and placing it in a bag. Then, all the tension-free yarn bundles wrapped in the bag are placed in a single-drum centrifuge for centrifugal dehydration.

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