Method for continuously transferring flash spinning solution

Abstract

The method for continuously transferring the flash spinning solution comprises the following steps: a transfer preparation step: providing a transfer space, and vacuumizing the transfer space; after the vacuumizing operation is completed, the transfer space continues to be filled with inert gas so as to carry out pressure rising operation, and the transfer space is subjected to temperature rising operation; an initial liquid adding step: controlling the transfer space to reach a first transfer pressure and a first transfer temperature; the balancing and transferring device is used for providing balancing and transferring power, inputting a solution into the transferring space and inputting the solution from a position which is lower than half of the height of the transferring space; and a continuous liquid supply step: after the input solution reaches the initial starting amount, the solution is supplied to the next production process through the transfer space, and meanwhile, the liquid level protection of the transfer space is controlled within a specific range. The method is used for continuously transferring the flash spinning solution, is used for production and manufacturing of a flash spinning process, and can be matched with other structures and methods to realize stable and continuous supply of the flash spinning solution.

Description

Technical Field

[0001] The invention relates to the field of flash spinning, in particular to a method for continuously transferring flash spinning solution. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is a fabric that does not require spinning and weaving. It is composed of oriented or random fibers. It is made by arranging textile short fibers or filaments in a directional or random manner to form a fiber web structure, and then reinforced by mechanical, thermal bonding or chemical methods.

[0003] Flash spinning, also known as instant spinning, is a special case of dry spinning using a flash spinning solution. It can be used to spin ultra-long fiber filaments and non-woven fabrics, and is therefore a technology and method for producing non-woven fabrics. Non-woven fabrics produced using this method are waterproof, moisture-proof, breathable, flexible, lightweight, non-combustible, easily decomposable, non-toxic, odorless, non-irritating, colorful, and recyclable. They are internationally recognized as environmentally friendly products and a new generation of environmentally friendly materials that protect the Earth's ecology. Due to the varying lengths and thicknesses (i.e., densities) of the fibers within, flash-spun non-woven fabrics can be produced with varying thickness, feel, and hardness by varying the processing equipment and raw materials. These products are suitable for use in various applications, including industrial (automotive interiors), chemical (printing substrates), healthcare (surgical gowns, protective clothing, disinfectant wraps, masks, diapers), apparel (shoemaking, leather), household (wallpaper, furniture fabrics, decorative materials, mattresses), and agriculture (reflective film).

[0004] For more information about existing flash spinning methods, as well as related systems, equipment, and methods for flash spinning to produce non-woven fabrics, please refer to Chinese invention patent applications such as CN115595675A, CN115852592A, and CN115976665A. Summary of the Invention

[0005] The problem solved by the present invention is to provide a method for continuously transferring flash spinning solution so as to enable continuous transfer of flash spinning solution, and at the same time be able to cooperate with other structures and methods to achieve a stable and continuous flash spinning solution provision scheme for the production and manufacturing of flash spinning process.

[0006] To solve the above problems, the method for continuously transferring flash spinning solution of the present invention includes: a transfer preparation step: providing a transfer space and performing a vacuum operation on the transfer space; after completing the vacuum operation, continuing to fill the transfer space with inert gas to perform a pressure increase operation, and performing a temperature increase operation on the transfer space; an initial liquid addition step: controlling the transfer space to reach a first transfer pressure and a first transfer temperature; providing balance and transfer power, inputting the solution into the transfer space, and inputting the solution from a height position below one-half of the transfer space; a continuous liquid supply step: after the input solution reaches the initial starting amount, the solution is provided to the next production process through the transfer space, and at the same time, the liquid level of the transfer space is controlled to be protected within a specific range.

[0007] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0008] The method for preparing and supplying flash spinning solution provided by the present invention can utilize the corresponding mixing space to mix the solutions. During the mixing and dissolving process, the solute can be safely and accurately input, and the solute can be subjected to a mixing driving action from the inside out and from the top down, so as to better match the mixing driving force, be more evenly distributed in the solvent, and be fully contacted and dissolved with the solvent, thereby ensuring the completion of the dissolution process, having a good mixing effect, and accurately controlling the dissolution time. It also helps to reduce the risk of solute accumulation and adhesion at the edge or inner wall of the mixing space, reduce agglomeration, further improve mixing uniformity, improve mixing efficiency and dissolution efficiency, and reduce energy consumption.

[0009] The method for preparing and supplying flash spinning solution provided by the present invention has closely coordinated steps, and utilizes vacuuming, pressure increase controlled by inert gas, and temperature increase to create stable conditions for the mixing process. The solute is input at the center of the mixing space to ensure efficient and uniform mixing of the solvent and the solute. The process of inputting the solvent and the solute is reasonably arranged, and multiple steps are interconnected to fully guarantee the dissolution process. The entire method steps constantly control conditions such as pressure and temperature, which not only improves the mixing efficiency of the solution but also ensures the stability of the solution. Ultimately, a uniform solution can be supplied to the next production process, ensuring the reliability and efficiency of production.

[0010] For more information about the solutions, structures, methods, properties and advantages of the present invention, please refer to the subsequent contents of this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 1 is a schematic diagram of a first cross-sectional structure of a transfer kettle provided in one embodiment of the present invention;

[0012] Figure 2 for Figure 1 A second cross-sectional structural schematic diagram of the transfer kettle is shown;

[0013] Figure 3 yes Figure 1 An enlarged schematic diagram of a portion of the structure of the transfer kettle is shown;

[0014] Figure 4 is a schematic top view of an internal temperature control structure provided by another embodiment of the present invention;

[0015] Figure 5 To have Figure 4 Schematic diagram of the cross-sectional structure of the transfer kettle with internal temperature control structure shown.

[0016] 500 - transfer kettle body; 500a - upper kettle portion; 500b - middle kettle portion; 500c - lower kettle portion; 501 - first assembly seat; 503 - third assembly seat; 504 - fourth assembly seat; 505 - upper kettle edge; 506 - lower kettle edge; 507 - upper opening; 508 - lower opening; 509 - lead assembly seat; 510 - solution input structure; 511 - solution internal input port; 512 - firmware structure; 530 - transfer pressure detection control structure; 540 - transfer warm liquid detection structure; 550 - transfer baffle; 551 - blocking fixing structure; 552 - transfer warm liquid fixing structure;

[0017] 600-transfer jacket; 601-external heat inlet; 602-external heat outlet; 603-temperature detection structure; 604-external solid structure;

[0018] 700 - Transfer drive device; 701 - Transfer motor; 702 - Transfer reducer; 703 - Transfer frame; 704 - Transfer head; 705 - Transfer drive mounting base; 706 - Transfer rotation shaft; 708 - Transfer stirring blade; 709 - Assembly structure; 710 - Gap; 711 - Temperature control tube; 712 - Upper arm; 713 - Screws; 714 - Power control line; 715 - Lead pipe;

[0019] h- the dividing line between the upper kettle portion 500a and the middle kettle portion 500b (indicated by a dotted line);

[0020] 1- the dividing line between the middle kettle portion 500b and the lower kettle portion 500c (indicated by a dotted line);

[0021] m-transfer kettle body 500 half height position (indicated by dotted line);

[0022] f- Transfer the kettle body 500 to a third of its height position (indicated by a dotted line). DETAILED DESCRIPTION

[0023] Flash spinning is difficult to implement because each step and detail presents numerous challenges that must be overcome. Detailed prior art documentation exists regarding the structure and methods of production equipment for preparing and supplying the flash spinning solution, as well as the structure and methods for continuously supplying the flash spinning solution for spinning.

[0024] An embodiment of the present invention provides a transfer kettle for continuously transferring flash spinning solution.

[0025] like Figures 1 to 3 As shown, the transfer kettle includes a transfer kettle body 500, a transfer jacket 600, and a transfer drive device 700. It should be noted that in the various cross-sectional structural diagrams of the transfer kettle, only the transfer kettle body 500 and the transfer jacket 600 are partially shown in cross-section (hence the corresponding cross-sectional oblique lines), while most other structures are shown in non-cross-sectional schematic structures. This is done to better illustrate the various structures of the transfer kettle.

[0026] like Figure 3 As shown, the transfer kettle body 500 has an upper opening 507 and a lower opening 508. The upper opening 507 is defined by the corresponding upper kettle edge 505, and the lower opening 508 is defined by the corresponding lower kettle edge 506. Design considerations for the upper opening 507 Figure 1 and Figure 2 The installation of the transfer drive device 700 and the sealing of the entire structure are shown. The design of the lower opening 508 takes into account the viscosity, temperature and other characteristics of the solution to ensure the required requirements for solution output, while ensuring accurate measurement and stable delivery of the solution to ensure the continuity and stability of the entire production line. The upper opening 507 is the largest opening of the transfer kettle body 500 and is used for Figure 1 and Figure 2 The transfer drive device 700 and other external structures are installed and extended into the transfer kettle body 500. Figures 1 to 3 The lower opening 508 serves as the outlet of the transfer kettle for outputting the solution, and is used to further provide the transferred solution to the next process (such as providing it to the process related to the subsequent spinning equipment).

[0027] Figure 3The transfer kettle body 500 is also shown as comprising an upper kettle portion 500a, a middle kettle portion 500b, and a lower kettle portion 500c. The dividing line between the upper and middle kettle portions 500a, 500b is indicated by a dashed line h, and the dividing line between the middle and lower kettle portions 500b, 500c, is indicated by a dashed line l. The upper and lower kettle portions 500a, 500c are essentially symmetrical, spherical cap-like structures, but they have the aforementioned different openings and other different structures. The upper kettle portion 500a has a number of supporting structures, such as various detection and monitoring devices. The middle kettle portion 500b is cylindrical. The three parts, the upper, middle, and lower kettle portions 500a, 500b, and 500c, form a roughly capsule-shaped overall structure.

[0028] The transfer kettle body 500 can be made of corresponding alloy steel or stainless steel and other materials so as to be able to withstand corresponding pressure and temperature conditions, thereby providing corresponding stable transfer conditions.

[0029] like Figures 1 to 2 The transfer jacket 600 is provided on the outside of the transfer kettle body 500 and is used to control the temperature of the transfer kettle body 500. The transfer jacket 600 is a hollow structure, which is covered on the outer surface of the transfer kettle body 500 and is combined with the transfer jacket 600 to form a heat exchanger. Figure 3 As can be seen, a portion of the transfer jacket 600 is attached to the majority of the outer surface of the middle kettle portion 500b, while another portion of the transfer jacket 600 is attached to the majority of the outer surface of the lower kettle portion 500c. The shape of the transfer jacket 600 is therefore determined by the corresponding external shape of the transfer kettle body 500, and in this embodiment, exhibits a barrel-like structure. It should be noted that the shape and size of the transfer jacket 600 can be designed based on the amount of heat to be exchanged to ensure stable solution transfer.

[0030] like Figure 1 The transfer jacket 600 has a corresponding external heat inlet 601 and an external heat outlet 602, which can usually transfer or remove heat through the circulation of heat transfer media such as steam, water or oil. That is, the temperature control of the transfer kettle body 500 by the transfer jacket 600 can be achieved through corresponding steam circulation, water circulation or oil circulation, and can further be reflected in the transfer jacket 600 controlling the increase, decrease or maintenance of the internal temperature of the transfer kettle body 500. The transfer jacket 600 also has a corresponding temperature detection structure 603. Figure 1 In the cross-sectional structure shown, the temperature detection structure 603 is arranged at an upper position substantially symmetrical to the external heat outlet 602 so as to detect the temperature at a position farther away from the external heat inlet 601, thereby being more conducive to accurate monitoring of the actual temperature control situation.

[0031] The main structure of the transfer jacket 600 can be made of a metal material with large heat exchange capacity and good thermal conductivity, and the efficiency and effect of temperature control can be adjusted by designing an appropriate heat exchange area.

[0032] like Figure 1 and Figure 2 The outer surface of the transfer jacket 600 also has a plurality of external fixing structures 604, which are used to fix the transfer jacket 600 on the corresponding external bracket ( Figure 1 and Figure 2 The external support is used to install the transfer kettle on the corresponding place. The external solid structure 604 can have 3, Figure 1 and Figure 2 Each outer solid structure 604 is shown, and it is known that another outer solid structure 604 is not shown. The three outer solid structures 604 can be evenly distributed on the outer surface of the transfer jacket 600, that is, the angles between them and the corresponding centers of the plane circles in which they are located are all 120 degrees.

[0033] The aforementioned external bracket is used to mount the transfer kettle on a suitable location, such as on the floor of a production workshop. Specifically, the external bracket may include a lateral support structure that supports the outer surface of the transfer jacket 600, a longitudinal support structure that supports the fixed structure from below, multiple supporting columns, a transverse reinforcement structure connecting the columns, and a base structure for securing the columns to a suitable location (e.g., the ground). For details on the structure and details of the external bracket for the mixing kettle, please refer to the aforementioned external bracket for mixing kettles.

[0034] like Figure 1 and Figure 2 The transfer drive device 700 includes a transfer motor 701, a transfer reducer 702, a transfer frame 703, and a transfer head 704. The transfer frame 703 internally houses a transfer drive shaft (not shown) and a transfer coupling (not shown). Other components of the transfer drive device 700 include mechanical seals and auxiliary seals. The transfer drive device 700 is used to provide balancing and transfer power for the solution within the transfer kettle 500, while maintaining solution stability.

[0035] like Figure 1The transfer drive device 700 has a transfer rotating shaft 706 and a transfer stirring and pushing blade 708, and the transfer stirring and pushing blade 708 is installed on the transfer rotating shaft 706. The transfer rotating shaft 706 is fixed on the shaft segment (not distinguished by marking) extending from the transfer head 704 through an assembly structure 709. The assembly structure 709 can specifically connect the corresponding shaft segment and the transfer rotating shaft 706 by, for example, screw connection. A corresponding transfer stirring and pushing blade 708 is installed at the bottom of the transfer rotating shaft 706. Since a transfer stirring and pushing blade 708 is included, the transfer kettle of this embodiment is a single-stage stirring structure. The transfer stirring and pushing blade 708 can be composed of two blades, three blades, four blades or five blades. The transfer stirring and pushing blade 708 can play the dual role of stirring and propulsion at the same time. On the one hand, it protects the uniformity of the solution composition of each part in the transfer kettle, and on the other hand, it provides auxiliary power for stable outward output.

[0036] Due to the transfer drive device 700, the solution input into the transfer kettle body 500 will form axial flow and radial flow under the stirring of the transfer stirring blade 708 of the transfer drive device 700, so that the solution is continuously stirred during the transfer process, ensuring temperature balance and uniform solution composition. The stirring action also improves the heat exchange efficiency between the solution and the external temperature control system (transfer jacket 600). At the same time, the transfer stirring blade 708 is located near the bottom of the transfer kettle body 500, and the distance between it and the kettle wall is moderate, which can moderately control the axial flow rate of the solution circulating inside, control heat exchange, prevent local temperature from being too high, and promote the temperature and heat to reach the desired balance. Reference can be made to the corresponding structure and content of the aforementioned mixing kettle blade.

[0037] refer to Figure 1 and Figure 2 The transfer drive device 700 further includes a transfer drive mounting seat 705, which also serves as a sealing kettle cover for sealing the transfer kettle body 500. The transfer drive mounting seat 705 is sealed and mounted on the upper kettle edge 505, thereby forming a Figure 3 The sealing function of the upper opening 507 is shown. The sealing condition is one of the use conditions of the transfer kettle provided by the embodiment of the present invention. The embodiment of the present invention is equivalent to making the transfer drive mounting base 705 a part of the transfer kettle body 500. Such a design can fully utilize the mutual cooperation between the two structures.

[0038] refer to Figures 1 to 3The transfer kettle further comprises a solution input structure 510, a transfer pressure detection and control structure 530, a transfer temperature detection structure, and a transfer liquid level detection structure, all mounted on the transfer kettle body 500. The solution input structure 510 is mounted on the upper kettle portion 500a of the transfer kettle body 500 using a first mounting base 501. The piping within the solution input structure 510 is secured to the inner wall of the transfer kettle body 500 via a fastener structure 512. The transfer pressure detection and control structure 530 is mounted on the upper kettle portion 500a of the transfer kettle body 500 using a third mounting base 503.

[0039] Figure 1 and Figure 3 It is also shown that the solution input structure 510 is located in the interior space of the transfer vessel 500, and the solution input port 511 is provided on the side wall of the mixing vessel 100. The solution input port 511 is located at a height less than half the height of the transfer vessel 500. The solution input structure 510 may also include components such as a valve (not shown) and a flow meter (not shown) for controlling the flow rate and flow velocity of the solution.

[0040] The design of the transfer kettle facilitates the entry and exit of solutions and the maintenance of the internal structure. The transfer kettle body 500, transfer jacket 600 and transfer drive device 700 cooperate to perform temperature control and power guarantee. Auxiliary structures such as the solution input structure 510, transfer pressure detection and control structure 530, transfer temperature detection structure and transfer liquid level detection structure enable the entire system to accurately control temperature, pressure and liquid level. The solution input port 511 of the solution input structure 510 is set on the inner wall of the transfer kettle body 500 and is located at a height less than half the height of the transfer kettle body to facilitate the stable input of the solution and avoid phase separation of the solution during the transfer process. The overall structure ensures the uniformity and stability of the transferred flash spinning solution, thereby improving the production efficiency of the flash spinning process.

[0041] At the same time, the height of the solution input port 511 is controlled to be above one-third of the height of the transfer kettle body 500, that is, the height of the solution input port 511 is controlled to be between one-third and one-half of the height of the transfer kettle body 500. Figure 1 and Figure 3 In the figure, the dotted line m represents the position of one-half of the height of the transfer kettle body 500, and the dotted line f represents the position of one-third of the height of the transfer kettle body 500, and the solution input port 511 is located between the dotted line f and the dotted line m.

[0042] The solution inlet 511 is typically positioned closely along the sidewall of the transfer kettle 500. Its height position needs to be determined taking into account various factors, including the volume and height of the transfer kettle, as well as the properties and stability of the solution. During the continuous solution transfer process using the transfer kettle, it is important to ensure that the solution inlet 511 remains below the liquid level within the transfer kettle, ensuring that the solution inlet 511 is always submerged in the solution, thereby ensuring the stability of the solution composition within the transfer kettle. This is because when the solution is poured or sprayed from above the liquid surface, it is more likely to cause splashing and disturbance of the solution within the kettle, potentially affecting the stability of the solution. In severe cases, if the splashed solution is sprayed onto the sidewalls within the kettle, adverse effects such as phase separation may occur. (The initial transfer of the solution into the transfer kettle 500 can be performed at a relatively slow speed. However, once the solution begins to be transferred out of the transfer kettle 500, the consumption rate of the subsequent process dictates that the solution must be input and output at a relatively fast speed.) On the other hand, the height of the solution inlet 511 should not be too low. If the height of the solution inlet 511 is too low, the solution that is input later may be discharged from the transfer kettle first, resulting in a portion of the solution that was input earlier remaining inside the transfer kettle for a long time. This portion of the solution may become unstable due to this prolonged retention time. Conversely, a higher height can ensure that the solution input from the solution inlet 511 into the transfer kettle is as "first in, first out" as possible. The higher the solution inlet 511, the farther it is from the lower opening 508 in the middle of the lower kettle portion 500c, which can ensure that the solution that was input earlier is discharged from the lower opening 508 first. Furthermore, the higher the solution inlet 511, the more it can prevent adverse situations such as collision or friction with the lower kettle portion 500c during installation or maintenance, thereby better protecting the solution inlet 511. As long as the solution inlet 511 is always below the liquid level, the higher the solution inlet 511, the better. By selecting the above-mentioned height range of the solution input port 511, this embodiment ensures that the solution that enters the transfer kettle first can be output from the transfer kettle as soon as possible, and also ensures that the solution always enters the transfer kettle from below the liquid level inside the transfer kettle, thereby promoting the solution to remain stable and uniform throughout the entire input and output process of the transfer kettle, so as to transfer (provide) reliable quality solution to the next production process.

[0043] The transfer drive device 700 includes a transfer drive mounting base 705, which also serves as a sealed lid for the transfer kettle body 500. Specifically, the transfer drive mounting base 705 is sealingly mounted on the upper kettle rim 505, thereby sealing the upper opening 507. Sealing is a crucial requirement for the use of the transfer kettle provided by the present invention. This embodiment of the present invention effectively incorporates the transfer drive mounting base 705 as part of the transfer kettle body 500, effectively leveraging the structural coordination between the two.

[0044] The transfer temperature detection structure and the transfer liquid level detection structure are combined into a transfer temperature and liquid detection structure 540. The transfer temperature and liquid detection structure 540 is assembled to the upper kettle portion 500a of the transfer kettle body 500 using the fourth assembly seat 504 and is used to detect both the internal liquid temperature and liquid level. The detection portion of the transfer temperature and liquid detection structure 540 is located within the transfer kettle body 500. The stability of the solution used in the transfer process is easily affected by changing conditions. Therefore, accurate liquid level and temperature detection are required to accurately monitor the state and conditions of the solution within the kettle in real time. Contact-type liquid detection devices are more capable of achieving this accurate detection. The location of the detection portion of the transfer temperature and liquid detection structure 540 within the transfer kettle body 500 also ensures more accurate temperature detection.

[0045] The transfer vessel 500 has at least one transfer baffle 550 inside. The transfer baffle 550 is secured to the interior of the transfer vessel 500 by a blocking and fixing structure 551. The number of blocking and fixing structures 551 can be one or more. The transfer baffle 550 is used to prevent the formation of deep vortices on the liquid surface during the stirring process. Deep vortices are detrimental to solution stability and may also cause more inert gas to dissolve into the liquid, hindering the subsequent spinning process of the spinning solution.

[0046] At least a portion of the transfer temperature liquid detection structure 540 is fixed to the transfer baffle 550. This structure is beneficial for protecting the transfer temperature liquid detection structure 540. The transfer temperature liquid detection structure 540 needs to be immersed in the liquid. The stirred liquid will generate a corresponding force on the transfer temperature liquid detection structure 540, and the transfer baffle 550 can prevent the corresponding liquid force from damaging the transfer temperature liquid detection structure 540. The transfer temperature liquid detection structure 540 can be fixed to the transfer baffle 550 using a blocking fixing structure 551. In order to reinforce the transfer temperature liquid detection structure 540, Figure 2 It is also shown that the transfer temperature liquid detection structure 540 is fixed to the inner wall of the transfer kettle body 500 and the transfer baffle 550 using the transfer temperature liquid fixing structure 552.

[0047] In summary, the transfer kettle provided in this embodiment has a transfer kettle body 500, a transfer jacket 600, a transfer drive device 700, and a solution input structure 510, a transfer pressure detection control structure 530, a transfer temperature detection structure and a transfer liquid level detection structure and other corresponding detection and control structures. The structure is sophisticated but the functions are comprehensive. At the same time, the position and height of the solution input port 511 are specially set, so that its height is specially set to less than half (and more than one third) of the height of the transfer kettle body 500, so as to facilitate the uniform distribution and effective transfer of the solution in the kettle body, meet the continuous use requirements of subsequent flash spinning solution, and can ensure high transfer efficiency and good detection and control accuracy (the state of the solution in the transfer kettle, such as pressure, temperature, liquid level and viscosity, can be monitored and controlled in real time and accurately), which helps to ensure the stability of the production process and product quality.

[0048] In another embodiment of the present invention, Figure 4 and Figure 5 As shown, the transfer kettle further includes an internal temperature control structure, which includes a temperature control tube 711 . The temperature control tube 711 is sleeved on the transfer rotating shaft 706 , and a gap 710 is formed between the temperature control tube 711 and the transfer rotating shaft 706 . Figure 4 is a top view schematic diagram of the internal temperature control structure, Figure 5 This is a schematic diagram of the cross-sectional structure of the internal temperature control structure installed in the transfer kettle.

[0049] When the temperature of the polymer solution used for flash spinning is reduced or too high, phase separation may occur. One of the results of the phase separation is that the solution is separated into two phases, one phase is a concentrated phase (high viscosity but may still flow) and the other phase is a dilute phase (low concentration). This result causes the solution to become ineffective and cannot be used in the next process flow. Therefore, it is necessary to prevent such a situation from occurring. The solution of this embodiment is a solution formed in a supercritical state at a relatively high temperature and high pressure, which is more prone to phase separation. Therefore, it is necessary to ensure the dual stability of the gas pressure and temperature inside the transfer kettle 500. The volume of the transfer kettle 500 is generally large (up to several meters, and the inner diameter can also be more than one meter). The gas pressure can usually be relatively accurately controlled dynamically by an inert gas and a monitoring system. Therefore, temperature becomes a corresponding important factor in controlling and adjusting the solution balance. The structure used for temperature control is usually only a transfer jacket 600 arranged on the outside of the transfer kettle 500. The temperature at the middle position inside the transfer kettle 500 is not easy to be adjusted in time, which becomes a corresponding process difficulty. How to control the internal solution temperature becomes one of the key factors to prevent the occurrence of solution phase separation and other situations.

[0050] The temperature control structure usually provided inside the kettle body is a structure such as a coiled tube. However, the coiled tube and other structures are usually in a winding shape, occupying a large space inside the kettle body, and the coiled tube and other structures require the corresponding heat transfer medium to circulate inside, which brings multiple challenges to the kettle body sealing design and the internal space structure arrangement. What's more, the solution of this embodiment is also more likely to undergo phase change and other unstable conditions at the bending positions of the coiled tube and other structures. Therefore, these existing structures are difficult to apply to the application scenarios of the transfer kettle of this embodiment.

[0051] This embodiment provides a corresponding temperature control tube 711 inside the transfer kettle 500, thereby enabling auxiliary temperature control from inside the transfer kettle 500, thereby enabling faster and more timely adjustment and control of the temperature of the solution at the middle position inside the transfer kettle 500, thereby better preventing adverse phenomena such as phase separation of the solution, better maintaining the stability of the solution, and solving the corresponding process difficulties. At the same time, combined with Figure 4 and Figure 5 It can be seen that the temperature control tube 711 of this embodiment is a corresponding straight tube sleeve structure without corresponding bending positions, which is more conducive to the internal auxiliary temperature control of the corresponding solution.

[0052] To ensure that the temperature control tube 711 can still control the temperature of the middle portion of the upper solution even when the solution level is at its highest, the top height of the temperature control tube 711 is designed to be greater than or equal to the maximum liquid level of the solution in the transfer kettle 500 (this maximum liquid level refers to the maximum liquid level of the solution in the transfer kettle 500 after the subsequent method enters the continuous liquid supply step). At this point, even if the solution reaches the maximum liquid level, the temperature control tube 711 can still control the temperature of the solution in the middle position, thereby better and more quickly controlling the temperature of each part of the solution. Since the transfer jacket 600 serves as an external temperature control structure, it is primarily attached to the majority of the outer surface of the middle kettle portion 500b of the transfer kettle 500 and the majority of the outer surface of the lower kettle portion 500c. The heat transfer medium is delivered into the transfer jacket 600 through the external heat inlet 601, which is located below the transfer jacket 600. Therefore, controlling the temperature of the middle portion of the upper solution via the temperature control tube 711 has a positive effect on the corresponding process.

[0053] In order to save energy and achieve precise temperature control, in another embodiment, the temperature control tube 711 is designed to have the function of segmented temperature control, so that the temperature control tube 711 can control the temperature according to the height of the liquid level inside the transfer kettle, that is, it can realize a segmented (different height parts) temperature control method from bottom to top.

[0054] In another embodiment, the bottom height of the temperature control tube 711 is designed to be lower than the minimum liquid level of the solution in the transfer kettle 500 (after the continuous transfer step is started). In this case, it is ensured that after the continuous transfer step is started, even when the liquid level is at its minimum, a section of the temperature control tube 711 is still immersed in the solution, so that the temperature control tube 711 can always control the temperature of the solution located in the middle position of the transfer kettle 500, thereby better and more quickly controlling the temperature balance of the solution.

[0055] Combined with reference Figure 4 In this alternative embodiment, the inner diameter (not labeled) of the temperature control tube 711 is set to be at least twice the cross-sectional diameter (not labeled) of the transfer shaft 706, and the outer diameter (not labeled) of the temperature control tube 711 is set to be at least 2.5 times but less than 5 times the cross-sectional diameter of the transfer shaft 706. These dimensions are designed to facilitate installation and ensure auxiliary temperature control. The inner diameter of the temperature control tube 711 is more than twice the cross-sectional diameter of the transfer rotating shaft 706, ensuring that the temperature control tube 711 can surround the transfer rotating shaft 706 and that the temperature control tube 711 is always located in the middle of the transfer kettle body 500. At the same time, the transfer rotating shaft 706 can rotate freely in the temperature control tube 711 without contact. A gap 710 is provided to allow the solution to flow freely in the gap 710. This part of the gap 710 can also achieve effective heating and heat transfer. The outer diameter is between 2.5 times and 5 times, which ensures that the temperature control tube 711 has sufficient wall thickness to withstand the pressure and temperature during the temperature control process and provide the required auxiliary temperature control requirements, while avoiding unnecessary material waste and processing difficulty caused by excessive size.

[0056] Combined with reference Figure 4 and Figure 5 The temperature control tube 711 is secured to the surface of the transfer head 704 of the transfer drive 700 via multiple upper arms 712, preventing the temperature control tube 711 from rotating with the transfer shaft 706. To ensure the proper installation and securement of the temperature control tube 711 and the transfer drive 700, consideration must be given to feasibility, potential safety risks, and maintenance costs. To ensure the proper operation and efficiency of the equipment and to fully utilize the available space and space within the entire structure, a method for securing the temperature control tube 711 using the upper arms 712 has been proposed, enabling the implementation of a comprehensive internal temperature control system. The transfer head 704 is typically protected by a thick metal casing. Screw holes are formed in the casing, allowing the upper arms 712 to be secured to the corresponding surface of the transfer head 704 using pins or screws. The corresponding surface of the transfer head 704 has a certain degree of curvature, which allows the inner wall of the upper arms 712 to be designed with a corresponding degree of curvature. Through appropriate design and adjustment, the inner wall of the upper arms 712 adheres closely to the corresponding surface of the transfer head 704. like Figure 4 , the upper arm 712 has corresponding screw holes (not marked), such as Figure 5 , the upper arm 712 is finally fixed to the transfer head 704 by screws 713.

[0057] like Figure 5 To achieve the temperature control function of the temperature control tube 711, the temperature control tube 711 must be connected to a power control line 714 to receive electrical energy and convert it into heat. The power control line 714, electrically connected to the temperature control tube 711, can be connected to an external power source (not shown) and a control system (not shown) via a lead conduit 715 and the lead assembly 509 of the transfer kettle body 500. Specifically, the power control line 714 passes through the lead conduit 715 and is connected to the exterior of the transfer kettle body 500. The lead conduit 715 is located in the lead assembly 509 of the upper kettle portion 500a of the transfer kettle body 500. The lead conduit 715 provides a safe and reliable connection channel for the power control line 714. The lead conduit 715 must ensure that the power control line 714 passes through while ensuring the overall sealing of the transfer kettle body 500. Therefore, the lead conduit 715 has a corresponding sealing structure to secure and seal the power control line 714. The lead conduit 715 can be sealed with corresponding sealant, sealing gasket or other sealing materials, or directly with other organic substances, and the lead conduit 715 can also be added with other mechanical sealing reinforcement structures to ensure that the lead conduit 715 and the lead assembly seat 509 are effectively sealed.

[0058] The interior of the transfer kettle 500 is a high-pressure, high-temperature, and somewhat corrosive environment. Therefore, both the temperature control tube 711 and the power control line 714 must be constructed of suitable corrosion-resistant electrical insulation materials. Furthermore, leakage current or sparks are extremely dangerous within the transfer kettle. Therefore, the power control line 714 can be coated with multiple layers of other protective structures. The temperature control tube 711 can also be constructed of suitable corrosion-resistant electrical insulation materials. Furthermore, the circuitry surrounding the temperature control tube 711 and the power control line 714 can be equipped with multiple overload protection circuit structures.

[0059] like Figure 5In this embodiment, the solution inlet 511 is a trumpet-shaped opening with a larger diameter as it approaches the end. The trumpet-shaped opening helps to improve the flow characteristics of the solution. When the solution flows out from the outlet with a gradually increasing diameter, the flow rate of the fluid at the solution inlet 511 will gradually decrease, thereby reducing the turbulence and eddy currents of the solution, making the flow of the solution smoother, and can smoothly guide the flow of the solution, reducing energy loss, thereby ensuring that the entire solution transfer process is smoother, so that the solution is more evenly distributed when flowing into the transfer kettle. The evenly distributed solution can more effectively contact the internal temperature control structure, thereby improving the heat exchange efficiency. This design also helps to reduce the impact and wear of the fluid on the edge of the outlet, extend the service life of the outlet, and has a certain function of regulating the flow rate. At the same time, it further prevents problems such as outlet blockage due to various situations, and facilitates regular maintenance and inspection.

[0060] The embodiment of the present invention also provides a method for continuously transferring the flash spinning solution using a transfer kettle.

[0061] The transfer kettle can be the transfer kettle provided in the above embodiments. Therefore, the above embodiments (including Figures 1 to 5 ) corresponding content. It can be seen that the transfer kettle includes main structures such as a transfer kettle body 500, a transfer jacket 600, and a transfer drive device 700. The transfer kettle body 500 has an upper opening 507 and a lower opening 508; the transfer jacket 600 is used to control the temperature of the transfer kettle body 500; the transfer drive device 700 is used to provide balance and transfer power for the solution inside the transfer kettle body 500; the transfer kettle also includes a solution input structure 510, a transfer pressure detection control structure 530, a transfer temperature detection structure, and a transfer liquid level detection structure installed in the transfer kettle body 500; the solution input structure 510 is located in the internal space of the transfer kettle body 500, and the solution internal input port 511 is set on the inner wall of the transfer kettle body 500, and the height of the solution internal input port 511 is located below one-half of the height of the transfer kettle body 500.

[0062] The method for continuously transferring the flash spinning solution using a transfer kettle provided in this embodiment includes the following steps.

[0063] Transfer preparation step: The transfer pressure detection and control structure 530 is used to evacuate the interior of the transfer kettle 500. After the evacuation is complete, the transfer pressure detection and control structure 530 is used to continue to pump inert gas into the transfer kettle 500 to increase the pressure, and the transfer jacket 600 is used to increase the temperature of the transfer kettle 500. Initial liquid addition step: The transfer pressure detection and control structure 530, the transfer jacket 600, and the transfer temperature detection structure are used to control the interior of the transfer kettle 500 to reach a first transfer pressure and a first transfer temperature. The transfer drive device 700 is activated to provide balancing and transfer power, and solution is introduced into the transfer kettle 500 through the solution input structure 510. Solution is also introduced through the solution inlet 511 from a height below one-half of the transfer kettle 500. Continuous liquid supply step: After the input solution reaches the initial starting amount, the solution is continuously supplied to the next production process through the lower opening 508 of the transfer kettle body 500. At the same time, the liquid level inside the transfer kettle body 500 is controlled to be maintained within the set range through the solution input structure 510 and the transfer liquid level detection structure.

[0064] The above method utilizes the transfer pressure detection and control structure 530 to evacuate and increase the pressure within the transfer kettle 500, ensuring precise control of the solution environment. The transfer jacket 600 and the transfer temperature detection structure, among other mechanisms, enable precise regulation of the temperature and pressure within the transfer kettle 500. Furthermore, the method utilizes the transfer drive device 700 in conjunction with the solution input structure 510 and output structure to achieve precise transfer control and an automated process, resulting in a highly automated solution transfer method. By introducing the solution from an inlet below halfway up the transfer kettle, the solution is ensured to be continuously introduced into the transfer kettle 500 from below the liquid surface after transfer begins. This ensures a smooth, efficient, reliable, and stable transfer process.

[0065] The above method ensures that the spinning solution can be stably and continuously provided to the next production process through the coordination of various steps, avoiding possible discontinuities and instabilities, and avoiding possible oxidation, phase separation and contamination of the solution during the transfer process, thereby improving production efficiency and ensuring the consistency and stability of the final product quality.

[0066] In the transfer preparation step, Figure 2Before the transfer pressure detection control structure 530 shown performs the vacuum operation on the interior of the transfer kettle body 500, it is first ensured that the transfer kettle body 500 has been sealed and has no leaks, and at the same time, the transfer pressure detection control structure 530 is ensured to be in good working condition, ensuring that it can accurately detect and control the pressure inside the transfer kettle body 500. Then start the vacuum operation, monitor the changes in the vacuum degree in real time, and adjust the vacuum speed as needed to achieve the required vacuum degree. The transfer pressure detection control structure 530 is used to monitor the pressure inside the transfer kettle body 500 in real time, and make corresponding operational adjustments according to the set pressure range. If the pressure reaches the set range, a corresponding signal is issued, the maintenance state is adjusted, and the next operation is waited for. It should be noted that in the transfer preparation step, a partial heating operation can also be performed first to facilitate and accelerate the vacuum operation.

[0067] In the transfer preparation step, the process of using the transfer pressure detection control structure 530 to fill the transfer kettle body 500 with inert gas can include: providing inert gas, which can be nitrogen or argon, etc., to ensure that each connection node of the inert gas supply structure is tight and leak-free; passing the inert gas into the transfer kettle body 500 through the corresponding pipes and valves. During the inert gas supply process, the corresponding valve can be slowly opened first, and the inert gas can be gradually filled into the transfer kettle body 500. The gas flow rate is controlled by the transfer pressure detection control structure 530 to ensure that the pressure gradually rises and that the transfer pressure detection control structure 530 monitors the pressure in the transfer kettle body 500 in real time; when the pressure reaches the preset value, the inert gas supply valve is closed to maintain the interior of the transfer kettle body 500 in the corresponding stable pressure range.

[0068] In the transfer preparation step, during the pressure-raising operation of filling the interior of the transfer kettle 500 with inert gas, the transfer jacket 600 can be used to perform a temperature-raising operation. The temperature-raising operation includes: starting the corresponding power and heat source providing device of the transfer jacket 600 (such as the burner of the steam boiler, the motor of the hot oil pump, etc., not shown in the figure), controlling the heating medium (such as hot oil, water vapor, hot water, etc., not shown in the figure) to enter the external heat inlet 601 of the transfer jacket 600 through appropriate valves and connecting devices, please refer to Figure 1After the heating medium fills the transfer jacket 600, it returns to the power and heat source providing device from the external heat outlet 602 of the transfer jacket 600 to form a cycle, so that the corresponding heating medium continuously controls the temperature of the transfer kettle body 500. Adjust the flow rate and temperature of the heating medium to control the heating rate of the transfer kettle body 500. In this process, the temperature detection structure 603 of the transfer jacket 600 and the transfer temperature detection structure (transfer temperature liquid detection structure 540) can be used simultaneously to detect the internal temperature of the transfer kettle body 500 and the heating temperature of the transfer jacket 600 to adjust the flow rate and temperature of the heating medium as needed, thereby maintaining the required heating curve. When the transfer kettle body 500 reaches the required temperature, adjust the heating system to maintain a stable temperature for a period of time. At the same time, the transfer pressure detection control structure 530 is used to ensure that the pressure and temperature inside the transfer kettle body 500 are within the preset range, and the corresponding preset range is the first transfer pressure and the first transfer temperature.

[0069] As mentioned above, the preset ranges of temperature and pressure in the transfer preparation step are also to adjust the temperature and pressure to the first transfer pressure and the first transfer temperature. However, at the beginning of the initial liquid addition step, it is necessary to ensure that this condition is achieved. Therefore, the cooperation of the transfer pressure detection control structure 530, the transfer jacket 600 and the transfer temperature detection structure is further utilized to control the interior of the transfer kettle body 500 to reach the first transfer pressure and the first transfer temperature. Therefore, when the pressure inside the transfer kettle body 500 is lower than the set first transfer pressure value, the transfer pressure detection control structure 530 increases the pressure. When the pressure is higher than the set first transfer pressure value, the transfer pressure detection control structure 530 reduces the pressure. When the pressure reaches the corresponding requirement, it is maintained. Through such a feedback adjustment mechanism, it is ensured that the pressure inside the transfer kettle body 500 is always maintained near the set first transfer pressure value. Similarly, when the temperature inside the transfer kettle 500 falls below the set first transfer temperature, the transfer temperature detection structure feeds this information back to the control system. Upon receiving the signal, the control system activates or increases the heating function of the transfer jacket 600 to control the temperature of the transfer kettle 500. When the temperature falls below the set first transfer temperature, heating is performed. When the temperature reaches the set first transfer temperature, heating is stopped or maintained in a manner that maintains a stable temperature (to maintain a dynamic balance between heat dissipation and heat supply). Conversely, when the temperature exceeds the set first transfer temperature, the control system controls the transfer jacket 600 to stop heating, thereby appropriately cooling the transfer kettle 500 and returning the temperature to the set first transfer temperature. This feedback control mechanism ensures that the temperature inside the transfer kettle 500 always remains near the set first transfer temperature. Through the coordination of the transfer pressure detection control structure 530, the transfer jacket 600, and the transfer temperature detection structure, the transfer kettle 500 is effectively controlled to reach the set first transfer pressure and first transfer temperature.

[0070] During the initial liquid addition step, the transfer drive device 700 is activated to generate a corresponding transfer force, which can be used to drive solution transfer. However, it should be noted that before the lower opening 508 is opened to the outside (the lower opening 508 is opened to the outside by a corresponding external control structure), the transfer force provided by the transfer drive device 700 is only used to balance and stir the solution. This is because the solution is not being transferred out of the body at this time, but only being input (from the mixing kettle into the transfer kettle body 500). Therefore, during the startup phase of the transfer drive device 700, the transfer drive device 700 should be adjusted to an appropriately low rotational speed, as it only needs to meet the requirements of balancing the solution. The specific rotational speed can be adjusted based on the design parameters of the transfer drive device 700, the viscosity of the solution, the temperature conditions, and the pressure conditions. It should be noted that the transfer drive device 700 can be activated first to provide balancing and transfer force (specifically, stirring force) before the solution is input into the transfer kettle body 500 via the solution input structure 510. This is to ensure that the solution remains in a dynamic state and that the solution is stable.

[0071] Combined with reference Figure 1 The transfer kettle 500 is a container for the transfer solution. When the transfer drive device 700 is started and reaches a predetermined rotational speed, the solution begins to flow into the transfer kettle 500 through the solution input structure 510. During this process, parameters such as the liquid level, viscosity, temperature, and pressure inside the transfer kettle 500 can be monitored in real time to ensure the safety and effectiveness of the operation. The pressure, the rotational speed of the transfer drive device 700, and the flow rate of the solution input structure 510 can be adjusted as needed to maintain the desired solution transfer rate and liquid level while keeping the temperature stable. The solution input structure 510 may include components such as pipes, valves (not shown), and flow meters (not shown) for controlling the flow rate and flow rate of the solution. The corresponding valves can be adjusted as needed to control the input speed of the solution.

[0072] During the initial liquid addition step, after the input solution reaches the initial starting volume, the solution is continuously supplied to the next production process through the lower opening 508. Simultaneously, the solution input structure 510 and the transfer liquid level detection structure control the liquid level within the transfer kettle 500 to remain within a set range. During the aforementioned initial liquid addition step, as the solution within the transfer kettle 500 reaches the initial starting volume, the liquid level typically continues to rise. When the solution within the transfer kettle 500 reaches this initial starting volume, the solution is continuously supplied to the next production process through the lower opening 508. Monitoring the initial starting volume can be achieved by detecting the solution level. Specifically, when the solution level reaches the initial starting height, the corresponding solution continuous transfer operation is initiated through the lower opening 508. To ensure that subsequent production processes can proceed stably and continuously, this embodiment strives to maintain the solution within the transfer kettle 500 near the initial starting volume. This means that the solution input and output rates are kept substantially equal. Furthermore, when switching between different mixing kettles to supply solution to the transfer kettle, rapid switching is also achieved. However, since the entire system requires multiple mixing kettles to sequentially supply solution to the transfer kettle during production, testing and confirmation steps are required when switching mixing kettles, and sometimes corresponding adjustments and controls are also required. Therefore, a certain interval is usually generated when switching mixing kettles. Therefore, the transfer kettle 500 may experience a situation where only solution is continuously output while solution input is suspended, and the corresponding liquid level will drop to a certain extent. To maintain the liquid level, the speed of solution input into the transfer kettle 500 needs to be adjusted to be slightly faster than the speed of solution output from the transfer kettle 500 within an appropriate time period, thereby keeping the liquid level inside the transfer kettle 500 within a small range. This range is generally approximately one-half the height of the transfer kettle 500.

[0073] Typically, once solution is initially supplied to the next production process, the liquid level within the transfer vessel 500 must be kept stable within a certain range. This is because the process of supplying solution from the mixing vessel 100 to the transfer vessel 500 should be as continuous as possible (although supply must be paused when switching mixing vessels) to maintain continuous production. To ensure that the liquid level within the transfer vessel 500 remains within a set range, this embodiment utilizes the coordinated coordination of the solution input structure 510, the transfer liquid level detection structure, the transfer drive device 700, and the transfer pressure detection and control structure 530 for control. The solution input structure 510 is responsible for adjusting the solution input rate based on changes in the liquid level. When the liquid level is below the set value, it increases the solution input; when the liquid level is above the set value, it reduces the solution input rate. The transfer liquid level detection structure (transfer warm liquid detection structure 540) is responsible for real-time monitoring of the liquid level within the vessel and feeding this information back to the solution input structure 510 so that the latter can make accurate adjustments. The transfer drive device 700 and the transfer pressure detection and control structure 530 control the rotational speed and pressure based on the liquid level, maintaining a stable pressure. The rotational speed is adjusted based on the liquid level. This ensures that the liquid level within the transfer kettle 500 remains within a set range and that the solution composition is stable and uniform, while also ensuring that the solution is transferred to the next production process at a steady rate. Because excessively high or low liquid levels can disrupt the transfer process, this embodiment precisely controls the solution input and monitors the liquid level in real time, ensuring that the entire system ensures smooth production flow.

[0074] During the initial liquid addition step and the continuous liquid supply step, the rotational speed of the transfer drive 700 is adjusted based on the liquid level within the transfer kettle 500. This embodiment employs a rotational speed control strategy based on liquid height feedback to ensure process stability and efficiency. Specifically, the rotational speed of the transfer drive 700 is dynamically adjusted based on the liquid level within the transfer kettle 500. When the liquid level within the transfer kettle 500 rises, the rotational speed of the transfer drive 700 is reduced. When the liquid level within the transfer kettle 500 decreases, the rotational speed of the transfer drive 700 is increased. When the liquid level within the transfer kettle 500 rises, it indicates that the solution is being transferred into the transfer kettle 500 at a relatively rapid rate. Although the solution continues to be transferred out, the rate of input is greater than the rate of output. At this time, due to the rising liquid level, the pressure exerted by the solution on the lower opening 508 continues to increase. To ensure a stable solution output rate, the rotational speed of the transfer drive 700 is correspondingly reduced, thereby maintaining a substantially constant total output pressure from the lower opening 508. Similarly, when the liquid level inside transfer vessel 500 decreases, this likely occurs during the mixing vessel switching period. This indicates that the solution may only be being transferred out without being input. As the liquid level continues to decrease, to maintain a roughly constant total output pressure at lower opening 508, the speed of transfer drive 700 is dynamically adjusted to increase, maintaining a stable output of the solution. The speed range of transfer drive 700 is crucial for ensuring uniform solution composition, stable output, and the design of the device itself.

[0075] Combined with reference Figure 1 and Figure 3 In this embodiment, the height of the solution input port 511 is located below one-half of the height of the transfer kettle body 500, and the solution is input from the position below one-half of the height of the transfer kettle body 500; at this time, the solution input port 511 is located at a lower horizontal position, ensuring that the solution liquid level is always above the solution input port 511, thereby allowing the solution to be input from below the liquid surface, making the overall liquid inside the transfer kettle body 500 more stable; at the same time, the height of the solution input port 511 is set to be above one-third of the height of the transfer kettle body 500, so that the solution can be "first in, first out" as much as possible in the transfer kettle; that is, this embodiment realizes the input of solution from a position between below one-half and above one-third of the height of the transfer kettle body 500. For more relevant reasons and advantages, please refer to the corresponding content of the aforementioned transfer kettle.

[0076] In this embodiment, the ranges of the first transfer pressure and the first transfer temperature are 200-220°C and 15-20 MPa; the ranges of the first transfer pressure and the first transfer temperature involve corresponding process requirements and solution conditions; based on the perspectives of solution stability and reduced energy consumption, the temperature is set at a lower state, but it is necessary to ensure that the composition of the solution is uniform, and reference can be made to the corresponding contents of the aforementioned embodiments.

[0077] like Figure 1 and Figure 2 As shown, the transfer drive device 700 includes a transfer drive mounting base 705, which also serves as a sealing lid for the transfer kettle 500. The transfer temperature detection structure and the transfer liquid level detection structure are combined into a transfer temperature and liquid detection structure 540. The transfer kettle 500 has at least one transfer baffle 550 within it, and at least a portion of the transfer temperature and liquid detection structure 540 is fixed to the transfer baffle 550. For details, please refer to the corresponding contents of the previous embodiment.

[0078] like Figure 1 and Figure 2 As shown, the transfer drive device 700 has a transfer rotating shaft 706 and a transfer stirring and pushing blade 708. The transfer stirring and pushing blade 708 is installed at the bottom of the transfer rotating shaft 706. The transfer stirring and pushing blade 708 also provides propulsion power during the continuous liquid supply step. The transfer stirring and pushing blade 708 is installed at the bottom of the transfer rotating shaft 706 to play a greater propulsion role. It works in conjunction with the inert gas pressure to jointly promote the flow of the liquid. That is, the propulsion power provided at this time includes the inert gas pressure and the propulsion power of the transfer stirring and pushing blade 708. Specifically, when the transfer rotating shaft 706 drives the transfer stirring and pushing blade 708 to rotate, the blade will cut and push the liquid, thereby generating a forward propulsion force. At the same time, there is an inert gas in the transfer kettle, and these gases will also generate corresponding pressure on the liquid, which is used to output the solution to the next production process. Please refer to the corresponding content of the above embodiment.

[0079] like Figure 1 In this embodiment, the solution inlet 511 has an inclined outlet plane. This outlet orientation improves the efficiency of solution outflow, reduces the possibility of residue and blockage, and maintains the stability of solution flow, ensuring that the solution is dynamically balanced as soon as it flows out by the corresponding driving force, thereby achieving a more uniform and stable solution composition.

[0080] Corresponding to the above structural embodiment, in another embodiment, the corresponding transfer kettle may further include a temperature control tube 711 sleeved on the transfer rotating shaft 706. Figure 4 and Figure 5 A gap 710 is defined between the temperature control tube 711 and the transfer rotating shaft 706. During the transfer preparation step, the temperature control tube 711 is utilized to control the temperature from within the transfer kettle. More importantly, during both the initial liquid addition step and the continuous liquid supply step, the temperature control tube 711 is utilized to simultaneously control the temperature of the solution from within the transfer kettle. This design ensures that the temperature control tube 711 does not come into direct physical contact with the transfer rotating shaft 706 during the temperature control process, thereby avoiding potential heat transfer losses or mechanical damage. Reference may be made to the corresponding contents of the aforementioned transfer kettle structure embodiment.

[0081] In this alternative embodiment, the effect of temperature on the solution is fully considered. The internal temperature control structure within the temperature control tube 711 is used to coordinately implement an internal temperature control method, thereby better ensuring that the solution remains within the desired temperature range throughout the entire process from entering the transfer kettle to transferring out of the transfer kettle. This is crucial for solution stability and subsequent processing steps. The temperature control tube 711 is located within the transfer kettle, allowing for more direct and efficient heat transfer to the solution. The temperature control method is more flexible and precise. By adjusting the heating power and heating time of the temperature control tube 711 and monitoring parameters such as the solution's temperature, pressure, and viscosity, precise control of the solution can be achieved, thereby ensuring that the solution remains stable throughout the transfer process and improving the reliability of the entire production method.

[0082] In this other embodiment, Figure 5 The temperature control tube 711 can be set not to directly contact the transfer rotating shaft 706 and the transfer stirring blade 708, but the distance between them needs to be reasonably set so that the temperature control tube 711 can also control their temperature to a certain extent, so that the temperature of these structures is maintained within the corresponding range, which is more conducive to the temperature stability of the solution.

[0083] In another embodiment of the method of continuously transferring the flash spinning solution using a transfer kettle, Figure 5 The top height of the temperature control tube 711 can be set to be greater than or equal to the maximum liquid level of the solution in the transfer kettle 500. Furthermore, after the continuous liquid supply step begins, the bottom height of the temperature control tube 711 can be controlled to be less than or equal to the minimum liquid level of the solution in the transfer kettle 500, ensuring that at least a portion of the temperature control tube 711 is submerged below the liquid level. The transfer temperature detection structure and the transfer liquid level detection structure are used in conjunction to control the temperature control portion of the temperature control tube 711 based on the liquid level within the transfer kettle. This design ensures that regardless of changes in the solution level, the temperature control tube 711 has sufficient length to effectively control the solution temperature. Furthermore, the temperature control area of ​​the temperature control tube 711 is precisely controlled to achieve precise adjustment of the solution temperature. The temperature control tube 711 itself can be equipped with a temperature detection structure. When adjusting the temperature control portion and temperature control power of the temperature control tube 711, the temperature control portion and temperature control power can be set and adjusted based on the solution temperature within the internal area monitored by the temperature control tube 711. This temperature control method can further improve efficiency and uniformity, ensuring that the solution is evenly heated during the temperature control process, and avoiding overheating or insufficient temperature inside the solution.

[0084] In this other embodiment, Figure 5, a temperature control tube 711 can be set to be fixed to the surface position of the transfer head 704 through multiple upper arms 712, and the temperature control tube 711 is kept fixed by the upper arms 712. During the rotation of the transfer stirring blade 708, the temperature control tube 711 will remain stable and fixed, providing a stable heat source. This structure can prevent the agitation and flow generated by the rotation of the transfer stirring blade 708 from causing movement or deformation of the temperature control tube 711, thereby preventing the impact on the transfer of heat and the temperature control effect of the solution. The temperature control tube 711 can specifically be fixed to the surface position of the transfer head 704 of the transfer drive device 700 through four upper arms 712 as shown in the figure. This design ensures the stability and reliability of the temperature control tube 711 during the solution transfer process. Specifically, the temperature control tube 711 is fixed to the surface of the transfer head 704 through the screw holes and corresponding screws of the upper arms 712.

[0085] In another embodiment, Figure 5 The solution input port 511 may be a trumpet-shaped opening with a larger diameter as it approaches the end, and the solution is input into the transfer kettle body 500 through the trumpet-shaped opening.

[0086] The embodiment of the present invention also provides a method for continuously transferring the flash spinning solution.

[0087] The method for continuously transferring the flash spinning solution comprises the following steps.

[0088] Transfer preparation step: provide transfer space and perform vacuum operation on the transfer space; after the vacuum operation is completed, continue to fill the transfer space with inert gas to perform pressure increase operation, and perform temperature increase operation on the transfer space; initial liquid addition step: control the transfer space to reach the first transfer pressure and the first transfer temperature; provide balance and transfer power, and input solution into the transfer space; continuous liquid supply step: after the input solution reaches the initial starting volume, the solution is provided to the next production process through the transfer space, and at the same time, the liquid level of the transfer space is controlled to be protected within a specific range.

[0089] This method uses pressure detection to control the vacuum and pressure within the transfer chamber, ensuring precise control of the solution environment. Temperature control and detection work in tandem to precisely regulate the temperature and pressure within the transfer chamber. Furthermore, this method coordinates balance and transfer power with the input and output of solutions, enabling precise transfer control and an automated process. This results in a highly automated solution transfer method, ensuring a smooth and efficient process.

[0090] The above method ensures that the spinning solution can be stably and continuously provided to the next production process through the continuous liquid supply step, avoids possible discontinuities and instabilities, avoids possible oxidation, phase separation and contamination of the solution during the transfer process, improves production efficiency, and ensures the consistency and stability of the final product quality.

[0091] The transfer space can be the corresponding transfer kettle (can be combined with reference Figures 1 to 5 The transfer space may be shaped like a capsule (e.g., a container, a device, or other suitable transfer equipment) and may be provided with corresponding sealing and transfer power functions and may be configured with corresponding temperature, pressure, viscosity, and other detection, monitoring, and control structures. Figures 1 to 3 ), in other embodiments, it can also be cylindrical. If the transfer space is in the shape of a capsule, it can be set vertically, and in this case there can be a corresponding driving device (for example Figure 1 and Figure 2 The transfer drive device 700 shown in FIG. 1 may be arranged vertically (i.e., it may be installed in the upper portion of the transfer space so as to extend toward the lower portion of the transfer space, or it may be installed directly in the lower portion of the transfer space), or it may be arranged horizontally. In this case, the drive device providing the driving force may also be arranged horizontally. Furthermore, the transfer space may be arranged in an oblique spatial structure.

[0092] The transfer preparation step includes vacuuming the transfer space, indicating that the transfer space can be a clear, closed or isolable space. As mentioned above, this space can be any form of container or closed area that meets the conditions, and its size and shape depend on the specific application requirements.

[0093] The vacuuming operation can utilize a vacuum pump or other vacuuming equipment to extract the air in the transfer space and remove gas molecules that may interfere with subsequent operations, such as oxygen, water vapor, etc. The vacuuming stops after reaching the corresponding vacuum degree. However, the transfer space is filled with an inert gas to perform a pressure boosting operation. The inert gas such as nitrogen or argon that can be filled into the transfer space can increase the air pressure in the space while maintaining a pure, undisturbed gas environment. The transfer space can then be heated up, and the heating up operation can be performed by a corresponding external temperature control structure to increase the temperature in the transfer space. It should be noted that in some embodiments, the heating up operation can also be started during the vacuuming operation step to improve the efficiency of the vacuuming.

[0094] In the initial liquid addition step, when the transfer space is controlled to reach the first transfer pressure and the first transfer temperature, the pressure of the transfer space can be accurately controlled by adjusting the amount of inert gas filled; by using an external temperature control structure and a temperature detection structure, the temperature of the transfer space can be accurately adjusted. When balancing and transferring power are provided, it can be power to transfer the solution from the transfer space to the next production process. This power can be provided in a variety of ways, for example, by increasing the pressure through gas, or by using stirring power. After providing conditions including sufficient transfer power, the solution can be input into the transfer space. Supplying the solution from the mixing space to the transfer space can be achieved in various ways, for example, using structures such as pipes and valves to smoothly guide the solution in the mixing space to the transfer space.

[0095] The speed and amount of the solution (from the mixing space) fed into the transfer space depends on the specific production requirements.

[0096] In the continuous liquid supply step, after the input solution reaches the initial starting volume, the solution is provided to the next production process through the transfer space. At the same time, the liquid level of the transfer space is controlled to be protected within a specific range. The corresponding operation methods and reasons can refer to the corresponding contents of the aforementioned embodiments.

[0097] In the continuous liquid supply step, before starting the continuous liquid supply, it is first necessary to ensure that the amount of input solution has reached the preset initial starting amount. This step can be achieved through the liquid level detection structure (refer to the transfer temperature liquid detection structure 540). When the input solution reaches the initial starting amount, it is necessary to ensure that the solution can be stably and continuously transported to the next production process through the transfer space. In this process, transmission structures such as pipes and valves can be used. At the same time, in order to ensure the safety and efficiency of production, the liquid level of the transfer space is controlled to keep it within a specific range. That is, while continuously supplying liquid, the liquid level of the transfer space is closely monitored. According to the liquid level data, the rate of input solution is automatically adjusted or other relevant parameters are adjusted to ensure that the liquid level remains within the preset range.

[0098] In the initial liquid adding step and the continuous liquid supply step, the speed of the transfer power can be adjusted according to the liquid level in the transfer space. When the liquid level in the transfer space increases, the speed of the transfer power is reduced. When the liquid level inside the transfer space decreases, the speed of the transfer power is increased.

[0099] This embodiment controls the range of the above-mentioned first transfer pressure and the first transfer temperature to be 200-220°C and 15-20MPa. The range of the first transfer pressure and the first transfer temperature involves the corresponding process requirements and solution conditions. Based on the perspective of solution stability and reducing energy consumption, the temperature is set at a lower state, but it is necessary to ensure that the composition of the solution is uniform, and the pressure is preferably relatively high. On the one hand, because the temperature is relatively low, it is necessary to ensure that the pressure is high so that the solution composition can remain unchanged. On the other hand, the stronger pressure is also the source of power for the solution output. Correspondingly, transfer driving power can be provided. If the corresponding power is achieved through rotational stirring, the speed range can be controlled according to the requirement of uniform solution composition and the design conditions of the equipment itself. Please refer to the corresponding content of the aforementioned embodiment.

[0100] The solution is introduced from a height position below one-half of the transfer space, and from a height position above one-third of the transfer space. On the one hand, the solution is introduced at an appropriate height position in the transfer space to ensure that the solution can be discharged from below the liquid level inside the transfer space, ensuring that the outlet of the introduced solution does not directly contact the bottom of the transfer space to achieve the desired input effect. On the other hand, the solution that enters the transfer space first is preferably discharged from the transfer space first. As mentioned above, the transfer space can be capsule-shaped or other shapes, but it is usually a relatively regular shape. It can be set vertically, horizontally, or diagonally. For a space with a regular shape, whether it is set vertically, horizontally, or diagonally, when the liquid level is at one-half of the height of the transfer space, the solution usually occupies about one-half of the entire internal volume of the space. Therefore, limiting the solution introduction to a height position below one-half of the transfer space still has corresponding significance for the transfer of the solution. Similarly, limiting the solution introduction to a height position above one-third of the transfer space also has corresponding significance. The two height restrictions can ensure the stability of the solution transfer process and ensure that the solution that enters the transfer space first is discharged from the transfer space first, etc. For reference, the corresponding contents of the above embodiments can be used.

[0101] Solution input can be achieved through devices and equipment such as pipes, openings, and ball valves (see the corresponding embodiments in the following sections of this specification), and parameters such as input speed and flow rate can be controlled. For details, please refer to the corresponding contents of the aforementioned embodiments and drawings. A liquid level sensor can be installed in the transfer space to monitor the liquid level of the solution in real time.

[0102] In the continuous liquid supply step, propulsion power is provided to the solution to ensure that the solution can flow stably and continuously to the next production process. This propulsion power can be achieved in a variety of ways, depending on the type of equipment used. For example, a pumping system can be installed at the bottom of the transfer kettle, and various types of pumps (such as centrifugal pumps, peristaltic pumps, diaphragm pumps, etc.) are used to provide the required propulsion power. At this time, it is necessary to ensure that the temperature and pressure of various pumping systems meet the corresponding requirements of pumping flash spinning solution. For example, the pump needs to be able to adapt to the viscosity, corrosiveness, temperature and high pressure conditions of the solution. At the same time, air pressure drive is always an important source of propulsion power. For example, air pressure can be generated by applying inert gas to push the solution to flow outward in, for example, a corresponding pipeline. This method can usually act downward from the top of the transfer space, and at this time, reference can also be made to the aforementioned embodiments of this specification. At the same time, mechanical stirring can also be used, for example, by using blades to stir and push the solution. The aforementioned embodiment combines mechanical stirring with gas pressure to achieve solution output. In the continuous liquid supply step, selecting an appropriate propulsion power mode is crucial to ensuring the stable flow of the solution, avoiding blockage and leakage, and meeting process requirements, so that the solution delivery speed and flow rate are stable while fully ensuring pressure loss and avoiding adverse factors that may affect the solution.

[0103] In another embodiment, an internal temperature control structure can be provided inside the transfer space (see Figure 4 and Figure 5 Corresponding content), at this time, in the transfer preparation step, the temperature is controlled from the inside of the transfer kettle using an internal temperature control structure. The heating element of the internal temperature control structure can be an (electric) heating wire, a heating plate, a heating tube, a heating film or a heating sleeve, etc., but it needs to be designed inside the transfer space without affecting other functions. The internal temperature control structure can also have a temperature detection feedback function, for example, including a temperature sensor and a temperature controller to monitor and control the temperature during the heating process in real time. The design of the internal temperature control structure should pay attention to safety and avoid mechanical loss to ensure its normal operation and extend its service life, thereby ensuring continuous temperature control of the solution and ensuring continuous transfer of the solution.

[0104] In another embodiment, during the initial addition and continuous liquid supply steps, the solution temperature can be simultaneously controlled from within the transfer vessel to ensure that the solution maintains an appropriate temperature throughout the addition and supply processes. The aforementioned internal temperature control structure can be utilized to simultaneously control the temperature during the corresponding steps. During the corresponding steps, the temperature can be monitored in real time, and temperature monitoring can be performed at multiple locations to ensure accurate temperature detection. Furthermore, temperature control and stirring can be coordinated, meaning an agitator can be provided to ensure that the solution remains uniformly stirred during the temperature control process. For example, before the initial addition, the transfer chamber can be preheated internally to reach the desired initial temperature, helping to reduce temperature fluctuations during the addition process. During the continuous liquid supply process, the internal temperature control structure should be able to maintain the internal solution within a set temperature range. If the flow rate of the input solution changes, the internal temperature control structure should be able to respond quickly and adjust the temperature control power to maintain a constant temperature within the transfer chamber. During both steps, the solution temperature, flow rate, and other relevant parameters should be continuously monitored to ensure process stability and reliability.

[0105] The temperature control part of the internal temperature control structure is controlled according to the liquid level height of the transfer space to ensure effective contact between the temperature control part and the solution. For example, the internal temperature control structure is divided into multiple temperature control areas or temperature control element groups according to the shape and size of the transfer space. At the same time, a liquid level sensor or liquid level gauge can be installed in the transfer space to monitor the liquid level height of the solution in real time. Liquid level sensing and temperature control form a linkage feedback so that the temperature control part can be automatically adjusted according to the change of liquid level. When the liquid level is low, only the bottom temperature control area is activated; when the liquid level rises, the power of the upper temperature control area is gradually increased. Please refer to the corresponding content of the above embodiment.

[0106] In another embodiment, the internal temperature control structure can be fixed inside the transfer space. Considering that the solution may fluctuate at different liquid levels, the internal temperature control structure should be able to cover the entire range from low liquid level to high liquid level after being fixed, so as to be able to efficiently and safely exchange heat with the solution. For details, please refer to the corresponding fixing structure of the above embodiment, such as the corresponding mechanical fixing arm (e.g. Figure 5 The upper arm 712 shown) etc.

[0107] In another embodiment, the flared opening (see Figure 5The solution is introduced into the transfer space through a solution inlet 511. The gradually expanding trumpet-shaped opening helps reduce turbulence and eddy currents in the solution as it flows into the transfer space. This design smoothly guides the solution flow, reduces energy loss, and ensures a more even distribution of the solution as it flows into the transfer space. This evenly distributed solution allows for more effective contact with the internal temperature control structure, thereby improving heat exchange efficiency. Reference may be made to the corresponding content of the aforementioned embodiments.

[0108] In order to simplify the content, this specification has largely avoided duplication in the composition, properties, functions, principles, effects and advantages of the same or similar structures and method steps between the various embodiments. Therefore, the composition, properties, functions, principles, effects and advantages of the different embodiments of this specification can be referenced and supplemented by each other.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. The technical solutions described in the embodiments may be modified, or some or all of the technical features therein may be replaced by equivalents. The technical features designed in different implementation modes may be combined with each other as long as they do not conflict with each other, and the corresponding technical solutions shall not deviate from the scope of protection required by the present invention. All other embodiments obtained based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

Claims

1. A method for continuously transferring flash spinning solution, characterized in that: include: Transfer preparation step: providing a transfer space and performing a vacuum operation on the transfer space; After the vacuuming operation is completed, the transfer space is continuously filled with inert gas to perform a pressure-increasing operation, and the transfer space is subjected to a temperature-increasing operation; Initial liquid addition step: controlling the transfer space to reach a first transfer pressure and a first transfer temperature; Providing balance and transfer power, inputting the solution into the transfer space, and inputting the solution from a height position below one-half of the transfer space; Continuous liquid supply step: After the input solution reaches the initial starting volume, the solution is supplied to the next production process through the transfer space. At the same time, the liquid level of the transfer space is controlled to be protected within a specific range.

2. The method for continuously transferring flash spinning solution according to claim 1, wherein: The solution is introduced from a position above one-third of the height of the transfer space.

3. The method for continuously transferring flash spinning solution according to claim 1, wherein: In the initial liquid addition step and the continuous liquid supply step, the rotation speed of the transfer power is adjusted according to the liquid level in the transfer space. When the liquid level in the transfer space increases, the rotation speed of the transfer power is reduced. When the liquid level inside the transfer space decreases, the rotation speed of the transfer power is increased.

4. The method for continuously transferring flash spinning solution according to claim 1, wherein: The first transfer pressure and the first transfer temperature are in the range of 200-220° C. and 15-20 MPa.

5. The method for continuously transferring flash spinning solution according to claim 1, wherein: Propelling power is provided to the solution during the continuous liquid supply step.

6. The method for continuously transferring flash spinning solution according to claim 1, wherein: An internal temperature control structure is provided inside the transfer space, and in the transfer preparation step, the temperature inside the transfer kettle is controlled by utilizing the internal temperature control structure.

7. The method for continuously transferring flash spinning solution according to claim 6, wherein: During the initial liquid adding step and the continuous liquid supplying step, the temperature of the solution is controlled simultaneously from inside the transfer kettle using the internal temperature control structure.

8. The method for continuously transferring flash spinning solution according to claim 6 or 7, wherein: The temperature control portion of the internal temperature control structure is controlled according to the liquid level of the transfer space.

9. The method for continuously transferring flash spinning solution according to claim 6 or 7, wherein: The internal temperature control structure remains stationary inside the transfer space.

10. The method for continuously transferring flash spinning solution according to claim 1, wherein: The solution is introduced into the transfer space through the trumpet-shaped opening.

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