Lyocell spinning equipment

Abstract

The invention discloses lyocell spinning equipment which comprises a coagulating bath tank used for containing coagulating bath liquid; at least partial section of the wire guide pipe horizontally extends, one end of the wire guide pipe is provided with a liquid inlet communicated with the coagulating bath tank, and the other end of the wire guide pipe is provided with a wire outlet; the spinning nozzle is arranged above the coagulating bath tank, a spinning opening of the spinning nozzle faces a tank opening of the coagulating bath tank, and tows sprayed out of the spinning opening enter the coagulating bath tank to be preliminarily coagulated, then enter the yarn guide pipe to be coagulated and then are pulled out of a yarn outlet of the yarn guide pipe. According to the invention, through the cooperation of the coagulating bath tank, the spinning nozzle and the wire guide pipe, the optimized design of the spinning equipment is realized, the spinning nozzle sprays the fibers into the coagulating bath tank for preliminary solidification, then the tows enter the wire guide pipe, and the horizontal extension section of the wire guide pipe prolongs the retention time of the fibers in coagulating bath liquid, so that the fibers are ensured to be fully solidified; and the mechanical property and the quality consistency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a lyocell spinning device. Background Art

[0002] As a new type of regenerated cellulose fiber, Lyocell has received extensive attention and application in the textile industry due to its excellent strength, softness and environmental protection characteristics. At present, the preparation of Lyocell fiber mainly adopts the dry-jet wet spinning method, that is, a high-concentration spinning solution is extruded through a spinneret to form a thin stream, which enters a coagulation bath after a short air layer (dry section) and is solidified and formed in the coagulation bath.

[0003] However, in the prior art, the residence time and coagulation path of the fiber in the coagulation process are limited, resulting in a series of technical problems. First, the spinning solution directly enters the coagulation bath from the spinneret for preliminary coagulation. The fiber does not stay in the coagulation bath for sufficient contact with the coagulation bath, resulting in incomplete fiber coagulation, which affects the mechanical properties and quality stability of the fiber. Secondly, the fiber is easily affected by liquid flow fluctuations and external interference in and after leaving the coagulation bath, resulting in uneven fiber diameter and decreased surface quality. In addition, the fiber transmission is unstable, making it difficult to achieve high-speed and stable continuous production, resulting in high fiber breakage and scrap rates.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a lyocell spinning device to achieve the purpose of improving the molding quality and production efficiency of lyocell fibers.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A lyocell spinning device, comprising: A coagulation bath tank, used for containing a coagulation bath liquid; The wire guide tube is horizontally extended at least partially, with a liquid inlet at one end connected to the coagulation bath and a wire outlet at the other end; The spinneret is arranged above the coagulation bath, and the spinneret orifice of the spinneret is arranged toward the notch of the coagulation bath. The filament bundle ejected from the spinneret enters the coagulation bath for preliminary coagulation, then enters the wire guide tube for coagulation and is pulled out from the wire outlet of the wire guide tube.

[0007] Furthermore, a liquid outlet is provided at the bottom of the coagulation bath, and the spinneret of the spinneret is arranged vertically opposite to the liquid outlet.

[0008] Furthermore, a warping roller and a drying roller are sequentially arranged downstream of the wire guide tube, and a waste wire collecting device is arranged between the warping roller and the drying roller. The wire bundle is pulled from the wire outlet of the wire guide tube to the warping roller, and then pulled from the warping roller to the drying roller. The waste wire collecting device is used to collect the waste wire generated during the pulling process.

[0009] Furthermore, the warping roller and the waste silk collecting device are arranged above the drying roller, and the central axes of the warping roller and the drying roller are arranged in parallel.

[0010] Furthermore, the waste silk collecting device at least comprises a first wire collecting roller and a second wire collecting roller whose central axes are arranged parallel to each other, the central axes of the first wire collecting roller and the second wire collecting roller are arranged parallel to the central axis of the warping roller, and the warping roller, the first wire collecting roller and the second wire collecting roller are arranged in sequence from top to bottom on one side above the drying roller; Furthermore, a water washing and sizing device is provided between the warping roller and the drying roller, and the tow is washed and sizing by the water washing and sizing device during the process of being pulled from the warping roller to the drying roller.

[0011] Furthermore, the water washing and sizing equipment is arranged above the drying roller on the other side opposite to the first and second wire collecting rollers.

[0012] Furthermore, the warping roller, the first wire collecting roller, and the second wire collecting roller are arranged in a staggered manner from top to bottom toward a side close to the washing and sizing equipment.

[0013] Furthermore, a spinning solution storage tank is arranged upstream of the spinneret, and the spinneret is connected to the spinning solution storage tank via a connecting pipe, and a metering pump is arranged on the connecting pipe for controlling the pumping of the spinning solution to the spinneret.

[0014] Furthermore, the metering pump is connected to a transmission gear, which is in driving connection with an output shaft of the motor. The motor drives the transmission gear to rotate, and the transmission gear drives the metering pump to pump the spinning solution to the spinneret.

[0015] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0016] In the present invention, the spinneret is directly arranged above the coagulation bath, and the spinneret is facing the notch of the coagulation bath. After the filament bundle is ejected from the spinneret, it enters the coagulation bath for preliminary coagulation; the coagulation bath provides a stable preliminary coagulation environment, in which the fiber begins to coagulate and form, the solvent is partially replaced, and the cellulose molecular chain begins to form a structure, which ensures that the fiber has sufficient strength and is convenient for subsequent transmission and processing; after the filament bundle is initially coagulated in the coagulation bath, it enters the wire guide tube for further coagulation, and is finally pulled out from the wire outlet of the wire guide tube. The horizontal extension section of the wire guide tube significantly increases the path of the fiber in the coagulation bath, prolongs the contact time between the fiber and the coagulation bath, so that the solvent inside the fiber can be fully replaced, and the cellulose molecular chain is further crystallized and oriented, ensuring that the fiber is fully coagulated.

[0017] In the present invention, the optimized design of the spinning equipment is achieved through the coordinated cooperation of the coagulation bath, the spinneret and the wire guide tube. The spinneret sprays the fiber into the coagulation bath for preliminary coagulation, and then the fiber bundle enters the wire guide tube. The horizontal extension section of the wire guide tube prolongs the residence time of the fiber in the coagulation bath, ensuring that the fiber is fully coagulated, and improving the mechanical properties and quality consistency. The optimization of the fiber transmission path of the present invention provides a stable coagulation and transmission environment, reduces the wire breakage rate, and improves production efficiency.

[0018] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings: Figure 1 , is a schematic diagram of the assembly structure of the lyocell spinning equipment of the present invention.

[0020] In the figure: 1. Coagulation bath tank; 11. First step tank; 12. Second step tank; 13. Notch; 14. Tank bottom; 2. Wire guide tube; 21. Bending section; 22. Horizontal section; 23. Wire outlet; 24. Connecting port; 3. Coagulation bath storage tank; 4. Spinneret; 5. Warping roller; 6. Washing and sizing equipment; 7. Drying roller; 8. Winding device; 9. Waste wire recovery device; 10. Motor; 101. Output shaft; 102. Transmission gear; 103. Metering pump; 104. Pump body; 105. Filter; 106. Spinning solution storage tank; 1061. Agitator; 107. Connecting pipe; 108. Fiber bundle.

[0021] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] As an embodiment of the present invention, a dry-wet spinning coagulation device applicable to a spinning device is provided, specifically, Figure 1 As shown, the dry-wet spinning coagulation equipment comprises a coagulation bath 1 and a wire guide tube 2. The coagulation bath 1 is used to contain a coagulation bath liquid, and the material of the coagulation bath 1 is preferably corrosion-resistant metal or high-strength plastic.

[0026] The wire guide tube 2 is a hollow tubular design with a smooth interior to reduce the friction resistance of the filament bundle 108 during the flow process. One end of the wire guide tube 2 is a liquid inlet, which is connected to the coagulation bath 1, and the other end is a wire outlet 23. At least a partial section of the wire guide tube 2 is horizontally extended to form a horizontal section 22. The horizontal section 22 of the wire guide tube is an important path for the coagulation of the filament bundle 108, and its length and inner diameter can be adjusted according to the requirements of the spinning process to ensure sufficient coagulation time and a stable flow environment.

[0027] The spinning device includes a spinneret 4, which is arranged above the coagulation bath 1, and the spinneret of the spinneret 4 is arranged toward the notch 13 of the coagulation bath 1. The filament bundle 108 ejected from the spinneret enters the coagulation bath 1 for preliminary coagulation, then enters the wire guide tube 2 for coagulation, and is then pulled out from the wire outlet 23 of the wire guide tube 2. Preferably, the distance from the spinneret 4 to the notch 13 of the coagulation bath 1 is less than the depth of the coagulation bath 1.

[0028] During operation, the fine stream ejected from the spinneret 4 first passes through a section of air layer (2-3 cm dry section), during which the fiber is initially stretched and oriented. Subsequently, the fiber enters the coagulation bath 1 for initial coagulation. The coagulated filament bundle 108 enters the wire guide tube 2 from the coagulation bath 1 through the liquid inlet of the wire guide tube 2, continues to contact with the coagulation bath and further coagulates. The filament bundle 108 flows through the horizontal section 22 of the wire guide tube, and in this section, it is fully coagulated by uniform liquid flow and stable temperature control. Finally, the coagulated filament bundle 108 is pulled out by the traction device at the wire outlet 23, completing the coagulation process, and enters the downstream further processing steps, such as cleaning, stretching and other processes.

[0029] In this embodiment, at least a partial section of the wire guide tube 2 is horizontally extended, and the filament bundle 108 entering the horizontal section 22 of the wire guide tube 2 can be fully immersed in the coagulation bath, thereby extending the contact time between the filament bundle 108 and the coagulation bath and improving the degree of solidification of the filament bundle in the coagulation bath.

[0030] When the tow 108 passes through the horizontal section 22 of the wire guide tube 2, it flows downstream along the direction in which the wire guide tube 2 extends, so that the tow 108 can maintain good directionality and stability during the solidification process. This directional effect prevents the tow 108 from randomly swinging and irregularly moving during the stretching and molding process, further improving the overall uniformity and tensile strength of the fiber. In addition, the tow 108 flows downstream along the direction of the wire guide tube 2, so that the tow 108 maintains a certain tension during the solidification process, achieving continuous orientation and stretching, so that the tow 108 is solidified while being directional stretched, effectively improving the Young's modulus and tensile strength of the fiber.

[0031] Furthermore, in the present invention, by combining the wire guide tube 2 with the coagulation bath 1, the horizontal extension section of the wire guide tube 2 ensures that the force of the filament bundle 108 in the coagulation bath is balanced, and the fiber forming process is more continuous and stable. The design of the wire guide tube 2 effectively reduces the turbulence and fluctuation when the fiber contacts the coagulation bath, avoiding the problems of uneven fiber thickness and poor surface quality caused by unstable liquid flow in the traditional coagulation bath.

[0032] In addition, the present embodiment reduces the volatilization and waste of solvents by the centralized flow of the coagulation bath in the wire guide tube 2, and the coagulation bath can be more effectively recycled, thereby reducing the pollution to the environment in the production process. Compared with the large amount of solvent used in the traditional open coagulation bath, the wire guide tube 2 structure of the present invention saves solvents while reducing the adverse effects on the environment, and has higher environmental friendliness.

[0033] As an implementation method of this embodiment, a liquid outlet is provided at the bottom 14 of the coagulation bath tank 1 so as to discharge the coagulation bath liquid from the bottom 14. The wire guide tube 2 is arranged below the coagulation bath tank 1, and its liquid inlet end is bent upward to form a bending section 21, and the end opening of the bending section 21 is connected to the liquid outlet of the coagulation bath tank 1, so that the filament bundle 108 can naturally flow into the wire guide tube 2 along with the coagulation bath liquid.

[0034] The outlet 23 of the wire guide tube 2 is horizontally extended in a direction away from the coagulation bath 1, ensuring that the filament bundle 108 can fully contact the coagulation bath in the horizontal section 22 of the wire guide tube 2 to achieve a uniform coagulation effect. This arrangement helps the filament bundle 108 to be further coagulated in the process of flowing through the wire guide tube 2, while maintaining the stability and uniformity of the liquid flow.

[0035] This structural design ensures that the coagulation bath liquid flows smoothly in the wire guide tube 2, so that the wire bundle 108 can smoothly enter the wire guide tube 2 for further coagulation after completing preliminary coagulation in the coagulation bath 1. Through the connection of the bending section 21, the liquid can maintain a stable flow rate and temperature when entering the wire guide tube 2 from the coagulation bath 1 to avoid external interference.

[0036] The design of the liquid outlet of the bottom 14 of the coagulation bath 1 in this embodiment ensures that the coagulation bath can flow smoothly into the wire guide tube 2, maintains the stability and temperature of the liquid flow, reduces the interference of the external environment, and ensures the controllability and stability of the coagulation process. The bending section 21 of the wire guide tube 2 is connected to the liquid outlet of the coagulation bath 1, so that the liquid flow is unimpeded, which helps the tow 108 to smoothly enter the wire guide tube 2 from the preliminary coagulation stage for further coagulation. The horizontal section 22 of the wire guide tube 2 provides an opportunity to fully contact the coagulation bath, achieves a uniform coagulation effect, and ensures the consistency and high quality of the fiber.

[0037] As another implementation of this embodiment, the bottom 14 of the coagulation bath 1 is provided with a flow channel extending radially along the bottom wall of the coagulation bath 1. Specifically, the flow channel is a groove structure, which is recessed on the bottom 14. The flow channel starts from the center of the bottom 14 or a fixed point, and extends radially outward to the edge of the bottom 14 to form a liquid outlet to guide the flow of liquid. The flow channel can be arranged on the bottom 14 to be inclined downward from the center of the bottom 14 to its edge, so as to use gravity to help the liquid flow more smoothly. This structure can prevent the liquid from being retained during the flow process and ensure the stability of the liquid flow.

[0038] The flow channel 14 at the bottom of the tank is used to guide the flow of the coagulation bath liquid and ensure that the liquid flows smoothly from the coagulation bath tank 1 into the wire guide tube 2. The liquid inlet of the wire guide tube 2 is connected to the flow channel, so that the coagulation bath liquid enters the wire guide tube 2 in a stable flow state, thereby maintaining the stability of the liquid flow, and further ensuring the uniform coagulation of the filament bundle 108 in the wire guide tube 2. The wire outlet 23 end of the wire guide tube 2 is horizontally extended in the direction away from the coagulation bath tank 1, ensuring that the filament bundle 108 can be stably transported out from the wire outlet 23 end along the direction of the coagulation bath flow and enter the next process, avoiding the influence of fluid turbulence on the stability of the filament bundle 108, improving the controllability and continuity of the coagulation process, and effectively improving the production efficiency and fiber quality.

[0039] Further, as an embodiment of the present invention, the horizontal extension length of the wire guide tube 2 is greater than the depth of the coagulation bath 1; specifically, the length of the horizontal section 22 of the wire guide tube 2 is preferably 2-5 times the depth of the coagulation bath 1. For example, if the depth of the coagulation bath 1 is 20 cm, the horizontal extension length of the wire guide tube 2 should be between 40 cm and 100 cm.

[0040] This method prolongs the immersion time of the tow 108 in the coagulation bath, so that the tow 108 can fully contact the coagulation bath in the horizontal section 22 of the wire guide tube 2, thereby enhancing the coagulation effect of the tow 108. Prolonging the length of the horizontal section helps the tow to reach a higher degree of coagulation before entering the subsequent process, thereby ensuring the quality and performance of the fiber.

[0041] Preferably, the wire guide tube 2 is a glass wire guide tube. Glass material has excellent chemical stability and corrosion resistance, can withstand the corrosion of the coagulation bath, and avoids the corrosion and pollution problems that may occur in metal wire guide tubes. In addition, the inner wall of the glass wire guide tube is smooth and impurities are not easily attached, which reduces the friction resistance of the wire bundle 108 during transmission, which is conducive to maintaining the integrity and surface finish of the fiber. The transparency of glass also makes it easy for operators to observe the flow state and coagulation of the wire bundle 108 in the wire guide tube 2 in real time, which is convenient for timely adjustment of process parameters to ensure the stability of the production process.

[0042] By designing the horizontal extension length of the wire guide tube 2 to be 2-5 times the depth of the coagulation bath 1, the residence time of the filament bundle 108 in the coagulation bath is extended, ensuring the full coagulation of the fiber. The horizontal section 22 provides a stable flow environment, allowing the filament bundle 108 to flow smoothly in the wire guide tube 2 along a fixed direction, reducing the adverse effects of liquid flow fluctuations and turbulence on the filament bundle 108. This design effectively avoids the problem of fiber breakage and uneven quality caused by excessive flow or turbulence during the coagulation process.

[0043] As another embodiment of the present invention, the dry-wet spinning coagulation device further includes a coagulation bath storage tank 3 for storing and circulating the coagulation bath liquid. The coagulation bath storage tank 3 is connected to the coagulation bath tank 1 through a pipeline, and is used to continuously supply the coagulation bath liquid to the coagulation bath tank 1 to ensure that the liquid level and composition in the coagulation bath tank 1 remain stable to meet the requirements of the spinning process.

[0044] Specifically, the coagulation bath storage tank 3 is connected to the coagulation bath tank 1 through a liquid supply pipeline, and a delivery pump is installed on the liquid supply pipeline to deliver the coagulation bath liquid from the coagulation bath storage tank to the coagulation bath tank. The delivery pump can be a frequency-controlled centrifugal pump or a peristaltic pump to accurately control the flow rate and delivery speed of the coagulation bath liquid and maintain the stability of the liquid level in the coagulation bath tank 1.

[0045] A connecting port 24 is provided at the end of the outlet 23 of the wire guide tube 2, and the connecting port 24 is connected to the coagulation bath storage tank 3 through a reflux pipe. After the coagulation bath liquid in the coagulation bath tank 1 completes the preliminary coagulation of the filament bundle 108, it flows through the horizontal section 22 of the wire guide tube 2, further contacts the filament bundle 108 and completes the coagulation process. Subsequently, the coagulation bath liquid flows back to the coagulation bath storage tank 3 along the reflux pipe through the connecting port 24 at the end of the outlet 23 of the wire guide tube 2.

[0046] Alternatively, the wire outlet 23 of the wire guide tube 2 forms the connecting port 24. Specifically, the wire outlet 23 of the wire guide tube 2 can be used for pulling out the wire bundle on the one hand, and on the other hand, the lower part of the wire outlet 23 of the wire guide tube 2 has an open liquid collecting trough, that is, the open end of the liquid collecting trough is located directly below the wire outlet 23 of the wire guide tube 2, and the liquid collecting trough is connected to the coagulation bath storage tank 3. The coagulation bath liquid in the wire guide tube 2 flows into the liquid collecting trough from the wire outlet 23, and flows back to the coagulation bath storage tank 3 from the liquid collecting trough.

[0047] Preferably, the bottom of the liquid collecting tank has an opening connecting the inside and outside of the liquid collecting tank, the opening is connected to the coagulation bath storage tank through a reflux pipe, and a filter screen covering the opening is provided on the opening for filtering broken wires, impurities, etc. in the coagulation bath liquid.

[0048] In order to ensure the stability of quality and temperature during the recycling of the coagulation bath, a temperature control device and a stirring device are provided in the coagulation bath storage tank 3. The temperature control device includes a heater and a cooler, which can accurately adjust the temperature of the coagulation bath according to the process requirements, usually maintained within a specific temperature range to ensure the coagulation effect of the fiber. The stirring device can be a mechanical stirrer or a magnetic stirrer, which makes the composition of the coagulation bath uniform through continuous stirring to prevent the coagulation effect from being affected by the stratification of the solvent and the non-solvent.

[0049] A filter device and a cooling device are set in the reflux pipeline. The filter device is used to remove impurities and fiber fragments that may exist in the coagulation bath to prevent them from having adverse effects on the fiber quality. The cooling device is used to adjust the temperature of the reflux coagulation bath to ensure that it has a suitable temperature when it returns to the coagulation bath storage tank and does not affect the temperature control of the entire bath.

[0050] In addition, in order to monitor and control the quality of the coagulation bath in real time, online detection devices such as temperature sensors, pressure sensors and concentration detectors can be installed on the coagulation bath storage tank 3, the liquid supply pipeline and the reflux pipeline. These devices transmit the detected data to the control system, and the control system automatically adjusts the operating parameters of the temperature control device, the delivery pump and the stirring device according to the real-time data to ensure that the temperature, flow rate and composition of the coagulation bath always meet the process requirements.

[0051] Through the above design, the coagulation bath forms a closed circulation system, which is transported from the coagulation bath storage tank 3 to the coagulation bath tank 1 through the liquid supply pipe, and after completing the initial coagulation of the filament bundle 108, it flows through the horizontal section 22 of the wire guide tube 2 to further coagulate the filament bundle 108, and then flows back to the coagulation bath storage tank 3 through the connecting port 24 and the reflux pipe. In this way, not only the recycling of the coagulation bath is realized, the production cost and resource consumption are reduced, but also the quality stability of the coagulation bath is ensured, and the continuity of the spinning process and the quality consistency of the fiber are improved.

[0052] In practical applications, the capacity and shape of the coagulation bath storage tank 3 can be designed according to the production scale and process requirements. In order to improve the automation of the system, an automatic alarm function can be set in the control system. When the temperature, concentration or liquid level of the coagulation bath exceeds the set range, the system will automatically alarm and make corresponding adjustments to ensure the safety and stability of production.

[0053] In addition, the coagulation bath storage tank 3 can be made of corrosion-resistant materials, such as stainless steel or high-strength plastic, and the inner wall is polished to prevent the chemical components in the coagulation bath from corroding the storage tank. The design of the storage tank should also consider the convenience of cleaning and maintenance, and a cleaning port or a sewage outlet can be set at an appropriate position to clean the storage tank regularly to ensure the purity of the coagulation bath.

[0054] By establishing a circulation system between the coagulation bath tank 1, the wire guide tube 2 and the coagulation bath storage tank 3, efficient utilization and recycling of the coagulation bath liquid are achieved, environmental pollution is reduced, and the concept of green production and sustainable development is met. At the same time, the coagulation bath liquid maintains a stable flow and uniform composition in the entire system, reducing fluctuations in the spinning process and ensuring the coagulation quality and stable performance of the fiber.

[0055] Furthermore, in this embodiment, the wire outlet 23 of the wire guide tube 2 is arranged above the communication port 24. This design allows the coagulation bath liquid to smoothly flow back to the coagulation bath storage tank 3 through the communication port 24, while the wire bundle 108 extends from the wire outlet 23 in the horizontal direction or upward, avoiding interference between the wire bundle 108 and the reflux liquid, and ensuring the transmission stability of the wire bundle 108 and the uniformity of the coagulation effect.

[0056] As another embodiment of the present invention, Figure 1 As shown, the coagulation bath 1 is stepped from the notch 13 to the bottom 14. The coagulation bath 1 is designed with a multi-step structure, starting from the notch 13, the inner wall size gradually decreases along the depth direction to form a stepped inner cavity structure.

[0057] Specifically, the coagulation bath 1 includes a first stepped groove 11 and a second stepped groove 12. The first stepped groove 11 is located above the second stepped groove 12. The cross-sectional area of ​​the first stepped groove 11 is larger than that of the second stepped groove 12. The first stepped groove 11 and the second stepped groove 12 are connected via a stepped transition section.

[0058] The filament bundle 108 ejected from the spinneret assembly first enters the first stepped groove 11, and initially contacts the coagulation bath to start the coagulation process. Since the cross-sectional area of ​​the first stepped groove 11 is large, the coagulation bath has a large volume here, which can provide sufficient space and coagulation bath volume, so that the filament bundle 108 is fully in contact with the coagulation bath, which reduces the impact force of the filament bundle 108 when entering the coagulation bath, and avoids the filament bundle 108 from being broken due to excessive resistance.

[0059] Subsequently, the filament bundle 108 enters the second stepped groove 12 along with the flow of the coagulation bath. Since the cross-sectional area of ​​the second stepped groove 12 is small, the flow rate of the coagulation bath increases here, which helps to further remove the solvent on the surface of the filament bundle and accelerate the coagulation process. At the same time, the stepped transition design enables the coagulation bath to form different flow characteristics at different depths, optimizing the coagulation environment of the filament bundle in the coagulation bath 1. The stepped structure can reduce the turbulence of the coagulation bath in the groove, reduce the shaking and swinging of the filament bundle during the coagulation process, and ensure the straightness and surface quality of the fiber; and the stepped structure of the coagulation bath 1 helps to form a temperature gradient in the depth direction, so that the temperature of the coagulation bath changes gradually from top to bottom, meeting the temperature requirements of the filament bundle at different coagulation stages, and further improving the quality of the fiber.

[0060] The present invention also provides a lyocell spinning device, comprising the above-mentioned dry-wet spinning coagulation device, and also comprising a spinneret 4. The spinneret 4 is arranged above the coagulation bath 1, and its spinneret is arranged toward the notch 13 of the coagulation bath 1. The filament bundle 108 ejected from the spinneret of the spinneret 4 first enters the coagulation bath 1 for preliminary coagulation, then enters the wire guide tube 2 for further coagulation, and finally is pulled out by the filament outlet 23 of the wire guide tube 2 by the traction device.

[0061] In this embodiment, a liquid outlet is provided at the bottom 14 of the coagulation bath 1, and the spinneret of the spinneret 4 is arranged vertically opposite to the liquid outlet. The purpose of this design is to allow the filament bundle 108 to directly enter the coagulation bath 1 in a vertical direction after being ejected from the spinneret 4, and to be located on the same vertical line as the liquid outlet of the coagulation bath 1, thereby ensuring that the movement path of the filament bundle 108 in the coagulation bath 1 is stable, reducing lateral swing, and improving the molding quality of the fiber.

[0062] The lyocell spinning equipment provided in this embodiment forms an efficient spinning system by optimizing the structure and relative position of the spinneret 4, the coagulation bath tank 1, the wire guide tube 2 and the coagulation bath storage tank 3. After the tow is ejected from the spinneret 4, it passes through the stepped groove of the coagulation bath tank 1 and the horizontal section 22 of the wire guide tube 2 in sequence, achieving sufficient and stable coagulation. The circulation system of the coagulation bath ensures that the quality and temperature of the coagulation bath are stable, and the resource utilization rate is high. The overall design improves the quality and production efficiency of the fiber product, and has significant economic and technical advantages.

[0063] Furthermore, the lyocell spinning device of the present invention further comprises: a warping roller 5, a waste yarn recovery device 9, a washing and sizing device 6, a drying roller 7 and a winding device 8, which are sequentially arranged downstream of the coagulation device along the running direction of the yarn bundle 108. The yarn bundle 108 is pulled from the yarn guide tube 2 of the coagulation device to the warping roller 5, and then pulled from the warping roller 5 to the drying roller 7. In this process, the yarn bundle 108 is washed and sizing treated by the washing and sizing device 6.

[0064] After the tow 108 is pulled out from the outlet 23 of the wire guide tube 2 of the coagulation device, it is first introduced into the warping roller 5. The warping roller 5 is used to perform preliminary tension control and arrangement on the tow 108, so that the fiber bundle can be straightened and maintain uniform tension. This helps to prevent the fiber from being loosened or broken in subsequent processing. The surface of the warping roller 5 is precisely processed with high finish and appropriate friction coefficient to ensure that the fiber passes smoothly on it without being damaged.

[0065] Between the warping roller 5 and the drying roller 7, a waste silk recovery device 9 and a washing and sizing device 6 are arranged. The waste silk recovery device 9 includes at least a first wire collecting roller and a second wire collecting roller whose central axes are arranged parallel to each other. The central axes of the two wire collecting rollers are parallel to the central axis of the warping roller 5, and the warping roller 5, the first wire collecting roller, and the second wire collecting roller are arranged in sequence from top to bottom on one side above the drying roller 7, and are staggered toward the side close to the washing and sizing device 6. This design allows any broken or loose waste silk to be effectively collected during the fiber pulling process to prevent it from being entangled on the equipment or falling to the ground, thereby keeping the production environment clean and the equipment operating normally.

[0066] The tow 108 is washed and sized by the washing and sizing device 6 during the process of being pulled from the warping roller 5 to the drying roller 7. The washing and sizing device 6 is arranged above the drying roller 7, on the other side opposite to the first and second collecting rollers. The washing process uses deionized water or a specific cleaning solution to completely remove the NMMO solvent and other impurities remaining in the fiber to ensure the purity of the fiber. The sizing treatment is to evenly coat a layer of slurry on the fiber surface, which usually contains a slip agent and an antistatic agent, to increase the smoothness and wear resistance of the fiber and improve the subsequent processing performance and feel of the fiber.

[0067] The drying roller 7 is used to dry the fibers after washing and sizing. The drying roller 7 is thermostatically controlled and equipped with a heating element inside. The temperature is evenly distributed to prevent the fibers from being overheated or partially damaged. The speed of the drying roller 7 is synchronized with the speed of the warping roller 5 and the winding device 8 to ensure the stability of the fiber tension. The dried fibers have an appropriate moisture content to meet the requirements of subsequent processing and storage.

[0068] Finally, the fiber is introduced into the winding device 8 and wound into a yarn cone on the winding device 8. During the winding process, the tension of the fiber is monitored and adjusted in real time through the tension control system by using the automatic tension adjustment device to prevent the fiber from relaxing or over-stretching. The precise control of the winding speed and winding tension ensures that the fiber is tightly and evenly wound on the reel to form a yarn cone with stable quality, providing high-quality raw materials for subsequent weaving or other processing procedures.

[0069] Furthermore, if Figure 1 As shown, the Lyocell spinning equipment also includes: The spinning solution storage tank 106 is arranged upstream of the spinneret 4 and is connected to the spinneret 4 through a connecting pipe 107. Furthermore, the connecting pipe 107 is designed with a unique three-section structure. The connecting pipe 107 starts from the outlet of the spinning solution storage tank 106 and first extends horizontally for a distance, which helps to reduce the influence of gravity on the spinning solution during the transportation process and ensures that the spinning solution is transported at a stable speed and pressure.

[0070] After the horizontal extension section, the connecting pipe 107 extends vertically upward. The main function of this section is to raise the height of the spinning solution and use the gravity potential energy to provide assistance for the subsequent transportation of the spinning solution; at the same time, the vertically upward extension section can also form a certain liquid level height difference, increase the static pressure of the spinning solution in the pipeline, and help to stably transport the spinning solution.

[0071] After the connecting pipe 107 extends upward to a predetermined height, it bends and extends vertically downward, and the spinneret 4 is arranged at the end of this pipe section. The spinning solution flows downward after the bend, and the spinning solution enters the spinneret 4 at a more stable flow rate and pressure by utilizing the acceleration of gravity. This design also makes the position of the spinneret 4 relatively low, which is convenient for operation and maintenance.

[0072] The vertical upward and downward extension of the connecting pipe 107 forms an inverted U-shaped structure. This design forms a natural liquid seal in the pipe, which can effectively prevent air or bubbles from entering the spinneret 4 and prevent bubbles from appearing in the spinning solution. Bubbles entering the spinneret will form fiber defects such as broken fibers and uneven thickness during the spinning process. By preventing the generation of bubbles, the continuity and uniformity of the fibers are ensured, and the physical properties and quality stability of the fibers are improved. In addition, due to the height difference and inverted U-shaped structure of the connecting pipe 107, even if the spinning solution refluxes, the spinning solution will remain in the connecting pipe 107 and will not reflux to the spinning solution storage tank 106, thereby preventing the contamination of the spinning solution in the storage tank.

[0073] The vertically downward extension section of the connecting pipe 107 of the present invention utilizes the effect of gravity, so that the spinning solution has a certain pressure when entering the spinneret 4, which is conducive to the stable extrusion of the spinning solution; at the same time, the use of gravity assistance can reduce the working pressure of the conveying pump, reduce equipment energy consumption, and extend the service life of the pump.

[0074] The spinning solution storage tank 106 is used to store the spinning solution required for spinning, ensuring that the spinning solution can be continuously and stably supplied during the spinning process. A metering pump 103 is provided on the connecting pipe 107, which is used to pump the spinning solution to the spinneret 4. The metering pump 103 can accurately control the delivery amount of the spinning solution, ensuring that the spinning solution is supplied to the spinneret 4 at a constant flow rate and pressure, thereby stabilizing the formation and quality of the fiber. The metering pump 103 can be a gear pump, a screw pump or a plunger pump, and the specific type can be selected according to the viscosity of the spinning solution and the process requirements.

[0075] Further, the power system of the lyocell spinning device includes a motor 10, which is connected to a metering pump 103 through a transmission gear 102, and is used to drive the metering pump 103 to pump the spinning solution. The output shaft 101 of the motor 10 is connected to the transmission gear 102, and the transmission gear 102 is connected to the metering pump 103, forming a power transmission system. The motor 10 preferably adopts a variable frequency motor or a servo motor to achieve accurate control of the speed of the metering pump 103.

[0076] During the spinning process, the spinning solution in the spinning solution storage tank 106 is transported to the metering pump 103 through the connecting pipe 107. When the motor 10 is running, its output shaft drives the metering pump 103 to rotate through the transmission gear 102. The gear ratio of the transmission gear 102 is carefully designed to ensure that the speed and delivery volume of the metering pump 103 meet the requirements of the spinning process.

[0077] The metering pump 103 pumps the spinning solution to the spinneret 4 at a constant flow rate and pressure. A homogenizing device is provided in the spinneret 4 to make the pressure of the spinning solution uniform at the spinneret orifice to prevent the flow rate fluctuation from causing uneven fiber thickness. The spinning solution is extruded from the spinneret orifice of the spinneret 4 to form a thin stream and enter the notch 13 of the coagulation bath 1 to start the coagulation molding process.

[0078] Preferably, a stirring paddle 1061 is provided in the spinning solution storage tank 106 for continuously stirring the spinning solution to maintain the uniformity and stability of the spinning solution. The stirring paddle 1061 is driven by a motor and rotates at an appropriate speed to prevent precipitation or uneven concentration in the spinning solution, thereby ensuring the quality of the spinning solution and improving the quality of the finished fiber.

[0079] Another pump body 104 is also provided on the connecting pipe 107. The pump body 104 is located between the spinning solution storage tank 106 and the metering pump 103, and is used to initially transport the spinning solution from the spinning solution storage tank 106 to the metering pump 103. The pump body 104 provides the primary transport power of the spinning solution, ensuring that the spinning solution can be transported to the metering pump 103 at a stable flow rate and pressure, reducing the load of the metering pump 103 and extending its service life. The pump body 104 can be a corrosion-resistant centrifugal pump or a screw pump, and the specific selection can be optimized according to the viscosity and flow characteristics of the spinning solution.

[0080] In addition, a filter 105 is provided downstream of the pump body 104 and upstream of the metering pump 103. The filter 105 is used to remove impurities and tiny particles in the spinning solution to prevent these impurities from entering the metering pump 103 and the spinneret 4, causing equipment wear, blockage and fiber quality degradation. The mesh size of the filter 105 can be selected according to the characteristics of the spinning solution and process requirements, and a 10-50 micron filter is usually used to ensure the filtering effect.

[0081] As an embodiment of the present invention, a lyocell spinning process is provided, comprising: Raw material preparation: In the spinning solution storage tank 106, pulp (cellulose raw material) is mixed with N-methylmorpholine-N-oxide (NMMO) solution to prepare a spinning solution with a solid content of 12%; the mixing temperature is 130°C to ensure that the pulp is fully dissolved to form a uniform and stable spinning solution; Transport and filtration of spinning solution: The dissolved spinning solution is transported to the filter 105 through the connecting pipe 107 by using the pump body 104. The spinning solution is filtered through the filter 105 to remove impurities and undissolved substances to ensure the purity of the spinning solution; Metering and extrusion of spinning solution: the filtered spinning solution is accurately metered using a metering pump 103 to ensure a stable flow rate and pressure; the metered spinning solution is extruded through a spinneret 4 to form a thin stream; the temperature of the spinning solution is always maintained at 130°C during the whole process; Initial stretching and orientation (dry section): The thin stream first passes through a 2-3 mm air layer (dry section), during which the fibers are initially stretched and oriented to improve the degree of orientation.

[0082] Fiber coagulation (wet section): After passing through the air layer, the fiber enters the coagulation bath (wet section) in the coagulation bath tank 1; the temperature of the coagulation bath is maintained at 10°C, and the coagulation bath liquid is usually deionized water or a diluted NMMO aqueous solution; in the coagulation bath, the solvent NMMO is washed away, and the cellulose is re-condensed and gradually solidified into a shape; Fiber extraction and coagulation: The fibers entering the coagulation bath 1 are then further coagulated in the wire guide tube 2 and extracted onto the warping roller 5 as the coagulation bath flows; Post-treatment of the primary filaments: The primary filaments are further washed, sizing and dried; the filaments are sizing to evenly coat the fiber surface with sizing to increase the smoothness and wear resistance of the yarns; Winding: The filament is unwound from the drying roller 7, enters the winding device 8, and is wound into a filament tube.

[0083] The lyocell filaments prepared by this process have stable fiber quality, high Young's modulus and tensile strength. The fiber diameter is uniform and the surface quality is good, meeting the requirements of high-quality textiles. The spinning speed reaches 300 m / min, which significantly improves the production efficiency. In addition, the solvent NMMO is effectively recycled, which reduces pollution to the environment, reduces production costs, and improves economic benefits.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A lyocell spinning device, characterized in that: include: A coagulation bath tank, used for containing a coagulation bath liquid; The wire guide tube is horizontally extended at least partially, with a liquid inlet at one end connected to the coagulation bath and a wire outlet at the other end; The spinneret is arranged above the coagulation bath, and the spinneret orifice of the spinneret is arranged toward the notch of the coagulation bath. The filament bundle ejected from the spinneret enters the coagulation bath for preliminary coagulation, then enters the wire guide tube for coagulation and is pulled out from the wire outlet of the wire guide tube.

2. A lyocell spinning device according to claim 1, characterized in that: A liquid outlet is provided at the bottom of the coagulation bath, and the spinneret of the spinneret is arranged opposite to the liquid outlet in the vertical direction.

3. A lyocell spinning device according to claim 1 or 2, characterized in that: A warping roller and a drying roller are sequentially arranged downstream of the wire guide tube, a waste wire collecting device is arranged between the warping roller and the drying roller, the wire bundle is pulled from the wire outlet of the wire guide tube to the warping roller, and then pulled from the warping roller to the drying roller, and the waste wire collecting device is used to collect the waste wire generated during the pulling process.

4. A lyocell spinning device according to claim 3, characterized in that: The warping roller and the waste silk collecting device are arranged above the drying roller, and the central axes of the warping roller and the drying roller are arranged in parallel.

5. A lyocell spinning device according to claim 4, characterized in that: The waste silk collection device includes at least the first and second silk collecting rollers whose central axes are arranged parallel to each other. The central axes of the first and second silk collecting rollers are arranged parallel to the central axis of the warping roller. The warping roller, the first and second silk collecting rollers are arranged in sequence from top to bottom on one side above the drying roller.

6. A lyocell spinning device according to claim 5, characterized in that: A water washing and sizing device is arranged between the warping roller and the drying roller. During the process of the tow being pulled from the warping roller to the drying roller, the tow is washed and sizing by the water washing and sizing device.

7. A lyocell spinning device according to claim 6, characterized in that: The water washing and sizing device is arranged on the other side above the drying roller and opposite to the first and second wire collecting rollers.

8. A lyocell spinning device according to claim 7, characterized in that: The warping roller, the first wire collecting roller and the second wire collecting roller are arranged in a staggered manner from top to bottom toward a side close to the washing and sizing equipment.

9. A lyocell spinning device according to any one of claims 1 to 8, characterized in that: A spinning solution storage tank is arranged upstream of the spinneret, and the spinneret is connected with the spinning solution storage tank through a connecting pipe, and a metering pump is arranged on the connecting pipe for controlling the pumping of the spinning solution to the spinneret.

10. A lyocell spinning device according to claim 9, characterized in that: The metering pump is connected with a transmission gear, which is in transmission connection with the output shaft of the motor. The motor drives the transmission gear to rotate, and the transmission gear drives the metering pump to pump the spinning solution to the spinneret.

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