Coagulating bath buffering and flow stabilizing device for hollow fiber spinning

Abstract

The utility model provides a coagulating bath buffering and flow stabilizing device for hollow fiber spinning, and relates to the field of spinning equipment.The coagulating bath buffering and flow stabilizing device comprises a recycling plate and a pore plate, the recycling plate is arranged on a coagulating bath tank, and the recycling plate is provided with an entering position facing the coagulating bath tank; the two pore plates are oppositely arranged at the two ends of the recovery plate in the first direction, and the first direction is the length direction of the coagulating bath tank; the upper part of the pore plate is connected with the recycling plate, the bottom end of the pore plate extends into the coagulating bath tank, the width of the pore plate is matched with that of the coagulating bath tank, and a plurality of round holes are uniformly distributed on the pore plate. The coagulating bath liquid impacts the pore plate, after energy is dispersed, the liquid can enter the area below the spinneret plate through the round holes, at the moment, flowing of the liquid is more uniform, the chemical potential difference of the coagulating bath at different moments tends to be stable, and then the fiber forming stability is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of spinning equipment, in particular to a coagulation bath buffering and stabilizing flow device for hollow fiber spinning. BACKGROUND

[0002] In the process of using the chemical method to prepare the hollow fiber membrane, the coagulation bath has a great influence on the spinning effect. In the coagulation bath device without real-time liquid supplement, when the circulation of the coagulation bath is insufficient, the concentrations of the coagulation bath at different positions are different, which influences the chemical potential difference of the system and further influences the speed of phase separation and the uniformity and regularity of the phase structure.

[0003] In this case, the circulation power of the coagulation bath can be increased to make the concentration in the same coagulation bath tank tend to be mixed uniformly, and the phase separation effect is good, but a new problem is caused, that is, the coagulation bath fluctuation is too large, which causes a large fluctuation of the hollow fiber membrane in the cooling process after entering the coagulation bath, and causes the hollow fiber form defects. CONTENT OF THE UTILITY MODEL

[0004] The coagulation bath buffering and stabilizing flow device for hollow fiber spinning provided by the application embodiment can disperse the impact energy of liquid circulation, the liquid flow is more uniform, the temperature difference is smaller, the chemical potential difference of the coagulation bath at different moments tends to be stable, and the stability of fiber forming is further improved, so that the problem of the coagulation bath fluctuation being too large and causing the hollow fiber form defects is solved.

[0005] The coagulation bath buffering and stabilizing flow device for hollow fiber spinning provided by the application embodiment comprises a recovery plate and a hole plate.

[0006] The recovery plate is arranged on the coagulation bath tank, and an entering position facing the coagulation bath tank is arranged on the recovery plate.

[0007] Two hole plates are oppositely arranged at two ends of the recovery plate in a first direction, the first direction is the length direction of the coagulation bath tank, the upper part of the hole plate is connected with the recovery plate, the bottom end of the hole plate extends into the coagulation bath tank, the width of the hole plate matches the width of the coagulation bath tank, a plurality of circular holes are arranged on the hole plate, and the plurality of circular holes are uniformly distributed.

[0008] In a feasible implementation manner, a plurality of guide surfaces are arranged on the recovery plate, and the guide surfaces form a certain angle with the horizontal plane.

[0009] In a feasible implementation manner, the recovery plate comprises:

[0010] Two first side plates are oppositely arranged in a second direction, and the second direction is perpendicular to the first direction.

[0011] Two second side plates are arranged between the two first side plates, and the two second side plates are oppositely arranged in the first direction. The two first side plates and the two second side plates form a loop-shaped structure, and the entering position is located in the middle of the loop-shaped structure, and the flow guide surface is located on the second side plate.

[0012] The two hole plates are respectively arranged on the outer walls of the two second side plates.

[0013] In a possible implementation, the first side plate is a straight side plate, and the first side plate is vertically arranged.

[0014] The second side plate is an inclined side plate, and the second side plate is arranged at an angle with the horizontal plane.

[0015] In a possible implementation, the back of the recycling plate of the loop-shaped structure, which is opposite to the coagulation bath tank, is a plane, the top end of the flow guide surface is connected to the plane, and the bottom end of the flow guide surface extends to the entering position.

[0016] In a possible implementation, the angle between the flow guide surface and the horizontal line is β, and 60°>β>15°.

[0017] In a possible implementation, the coagulation bath buffering and stabilizing flow device further comprises a fixing member.

[0018] The fixing member is arranged on the recycling plate and connected to the coagulation bath tank.

[0019] In a possible implementation, the two fixing members are respectively arranged on the two sides of the recycling plate, the fixing member is a clamping member, and the fixing member is clamped to the top of the coagulation bath tank.

[0020] In a possible implementation, the coagulation bath buffering and stabilizing flow device further comprises a guide assembly.

[0021] The guide assembly is arranged at the bottom end of the hole plate, and the fiber is slidingly connected to the outer wall of the guide assembly.

[0022] In a possible implementation, the lower part of the hole plate is provided with a groove, the guide assembly is arranged in the groove, and the guide assembly comprises:

[0023] A roller is arranged in the groove, and the bottom end of the roller is lower than the bottom end of the hole plate.

[0024] A rotating shaft is arranged at both ends of the roller in the length direction, and the rotating shaft is rotationally connected to the inner wall of the groove.

[0025] The hollow fiber spinning coagulation bath buffering and stabilizing flow device provided by the embodiment of the present application is characterized in that a recovery plate is arranged on the coagulation bath tank, the recovery plate is provided with an entering position facing the coagulation bath tank, both ends of the recovery plate in the first direction are provided with hole plates, the width of the hole plate matches the width of the coagulation bath tank, a plurality of round holes are arranged on the hole plate, and the plurality of round holes are uniformly distributed. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of the hollow fiber spinning coagulation bath buffering and stabilizing flow device provided by the present application;

[0027] Figure 2 FIG. 2 is a top view of the coagulation bath buffering and stabilizing flow device;

[0028] Figure 3 FIG. 3 is a schematic diagram of the hole plate and the connecting structure thereof;

[0029] Figure 4 FIG. 4 is a schematic diagram of the coagulation bath buffering and stabilizing flow device in use.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 10-recovery plate; 20-hole plate; 30-fixing piece; 40-guiding assembly;

[0032] 11-entering position; 12-flow guiding surface; 13-first side plate; 14-second side plate; 21-round hole; 22-groove; 41-rolling shaft; 42-rotating shaft. DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the protection scope of the present application.

[0034] The coagulation bath is an important concept in chemical fiber manufacturing. In the process of chemical fiber wet spinning, the coagulation bath is used to coagulate the spinning dope extruded from the spinneret into fibers. The spinning dope is a polymer solution or melt, and when it enters the coagulation bath, the chemicals in the coagulation bath and the dope react, causing the solvent and polymer in the dope to separate, and the polymer to coagulate into fibers.

[0035] For example, in viscose fiber production, the viscose solution is ejected from the spinneret into a coagulation bath composed of sulfuric acid, sodium sulfate, etc. The sulfuric acid neutralizes the alkali in the viscose, and the sodium sulfate dehydrates the viscose, causing it to coagulate into fibers.

[0036] A coagulation bath is a container used to hold the coagulation bath. It is typically an elongated trough that allows the spinning solution extruded from the spinneret sufficient time and space to complete the coagulation process within the coagulation bath. The bath material is typically corrosion-resistant, as the chemicals in the coagulation bath can be corrosive. Furthermore, the bath is equipped with a circulation system to ensure uniform distribution of the chemicals in the coagulation bath and maintain a stable temperature. This helps ensure consistent fiber quality throughout the coagulation process and reduces fiber quality issues caused by local variations in the coagulation bath composition or temperature.

[0037] In the chemical production of hollow fiber membranes, the coagulation bath significantly impacts the spinning results. In coagulation bath systems that don't replenish liquid in real time, insufficient circulation of the coagulation bath can lead to varying concentrations across the bath, affecting the chemical potential difference in the system and, in turn, the speed of phase separation and the uniformity of the phase structure. This can be addressed by increasing the coagulation bath's circulation power to achieve a more uniform concentration within the same coagulation bath, resulting in better phase separation. However, this presents a new challenge: excessive coagulation bath fluctuations can cause significant fluctuations in the cooling process of the hollow fiber membrane after entering the coagulation bath, resulting in defects in the hollow fiber's morphology.

[0038] The coagulation bath buffering and stabilizing flow device for hollow fiber spinning provided in this application, the symmetrical metal orifice plate and the circular hole design on the orifice plate surface can disperse the impact energy of liquid circulation, make the liquid flow more uniform, and the temperature difference smaller, so that the chemical potential difference of the coagulation bath at different times tends to be stable, thereby improving the stability of fiber forming.

[0039] The specific structure of the coagulation bath buffering and flow stabilizing device for hollow fiber spinning provided by the present application is described in detail below with reference to the accompanying drawings.

[0040] Reference Figures 1-3 As shown, an embodiment of the present application provides a coagulation bath buffering and stabilizing flow device for hollow fiber spinning, comprising a recovery plate 10 and a perforated plate 20, wherein the recovery plate 10 is used to recover volatile solvents, and the perforated plate 20 is used to disperse the coagulation bath liquid capacity, so that the flow of the liquid is more uniform, and the chemical potential difference of the coagulation bath at different times tends to be stable, thereby improving the stability of fiber forming.

[0041] The recovery plate 10 is arranged on the coagulation bath and directly below the spinneret. The recovery plate 10 is provided with an entry position 11 facing the coagulation bath. The entry position 11 can be a through hole. The fibers discharged from the spinneret pass through the entry position 11 and enter the coagulation bath.

[0042] likeFigure 1 and Figure 2 As shown, the orifice plate 20 can be a rectangular plate body, and the two orifice plates 20 are relatively arranged at the two ends of the recovery plate 10 in the first direction. The first direction is the length direction of the coagulation bath. Figure 1 In the example, the first direction is the left-right direction;

[0043] The upper portion of the orifice plate 20 is connected to the recovery plate 10 , and the bottom end of the orifice plate 20 extends into the coagulation bath. The width of the orifice plate 20 matches the width of the coagulation bath. The orifice plate 20 is provided with a plurality of circular holes 21 , which are evenly distributed.

[0044] The coagulation bath liquid impacts the orifice plate, and after the energy is dispersed, the liquid can enter the area below the spinneret through the circular hole. At this time, the flow of the liquid is more uniform, making the chemical potential difference of the coagulation bath at different times tend to be stable, thereby improving the stability of fiber forming.

[0045] Reference Figure 1 As shown, in some embodiments, the recovery plate 10 is provided with a plurality of guide surfaces 12, the guide surfaces 12 are at a certain angle to the horizontal plane, the guide surfaces 12 are planes inclined at a certain angle, the angle β between the guide surfaces 12 and the horizontal line is 60°>β>15°;

[0046] After the volatilized solvent is cooled on the guide surface 12 , it can flow back into the coagulation bath along the guide surface 12 , thereby improving the utilization rate of the solvent and reducing the number of cleaning times.

[0047] Reference Figure 1 and Figure 2 As shown, in some embodiments, the recovery plate 10 includes;

[0048] The first side plates 13 are arranged opposite to each other in the second direction, the second direction is perpendicular to the first direction, and the first side plates 13 are arranged opposite to each other in the second direction. Figure 1 In the embodiment, the second direction is the front-to-back direction, and the two first side panels 13 are symmetrically arranged in the front-to-back direction; the first side panels 13 are vertically arranged panels, and the first side panels 13 are isosceles trapezoids, with the long side on top and the short side on the bottom;

[0049] A second side plate 14 is provided between the two first side plates 13. The two second side plates 14 are arranged opposite to each other in the first direction. The two second side plates 14 are symmetrically arranged in the left-right direction and are respectively located at the left and right ends of the two first side plates 13. The second side plate 14 is a rectangular plate body. The front and rear ends of the second side plate 14 are respectively connected to the left end or the right end of the two first side plates 13. Because the first side plate 13 is an isosceles trapezoid, the bottom end of the second side plate 14 is inclined inward at a certain angle, and the upper surface of the second side plate 14 is the guide surface 12;

[0050] The two first side plates 13 and the two second side plates 14 form a circular structure, and the entry position 11 is located in the middle of the circular structure and is a through hole.

[0051] The two orifice plates 20 are respectively disposed on the outer walls of the two second side plates 14 .

[0052] Reference Figures 2-4 As shown, in some embodiments, the side of the recovery plate 10 with a U-shaped structure facing away from the coagulation bath is a plane, the top of the guide surface 12 is connected to the plane, and the bottom of the guide surface 12 extends to the entry position 11. The volatile solvent is cooled on the guide surface 12 and then flows back into the coagulation bath through the entry position 11.

[0053] Reference Figures 1-3 As shown, in some embodiments, the coagulation bath buffer flow stabilization device further includes a fixing member 30;

[0054] The fixing member 30 is disposed on the recovery plate 10 and connected to the coagulation bath, so that the device is fixed on the side of the coagulation bath.

[0055] In some embodiments, two fixing members 30 are respectively provided on both sides of the recovery plate 10 . The fixing members 30 are clamping members. The fixing members 30 may be L-shaped clamping plates. The fixing members 30 are clamped to the top of the coagulation bath.

[0056] Reference Figure 3 As shown, in some embodiments, the coagulation bath buffer flow stabilization device further includes a guide assembly 40;

[0057] The guide assembly 40 is disposed at the bottom end of the orifice plate 20 , and the fiber is slidably connected to the outer wall of the guide assembly 40 .

[0058] In some embodiments, a groove 22 is provided at the lower portion of the orifice plate 20, and a guide assembly 40 is disposed in the groove 22, and the guide assembly 40 includes;

[0059] The roller 41 is disposed in the groove 22 , and the bottom end of the roller 41 is lower than the bottom end of the orifice plate 20 ;

[0060] The rotating shaft 42 and the ends of the roller 41 in the length direction are rotatably connected to the inner wall of the groove 22 through the rotating shaft 42;

[0061] The roller 41 can rotate freely. During spinning, the fiber passes through the bottom end of the device and is slidably connected with the outer wall of the roller 41, causing the roller 41 to rotate, thereby reducing the friction of the device on the fiber.

[0062] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0063] 1. The present application provides a table, a recovery plate, a perforated plate and a bracket in the device, so that the device can be stably placed on the coagulation bath, which is convenient for the recovery and cleaning of the volatile solvent and has a good effect of dispersing the impact.

[0064] 2. In this application, the straight side panels of the recovery plate are designed to be perpendicular to the table surface, so that the straight side panels can be matched with the bracket and the device can be accurately fixed on the edge of the coagulation bath.

[0065] 3. The present application adopts a design in which the inclined side plates in the recovery plate are symmetrical and form a certain angle with the table surface, ranging from 15° to 60°, so that the volatile solvent can flow back to the coagulation bath along the inclined side plates after cooling on the surface, thereby improving the solvent utilization rate and reducing the number of cleaning times. At the same time, the center of the recovery plate is unobstructed, and the casting liquid in the spinneret enters the coagulation bath vertically.

[0066] 4. The present application adopts the design of seamless connection between the straight side plate and the oblique side plate in the recovery plate, so that the device can be cleaned very conveniently along the recovery plate without any dead corners.

[0067] 5. This application utilizes a two-plate, bilaterally symmetrical design to surround the fiber forming area below the spinneret, creating a controllable area. When the coagulation bath liquid impacts the plate surface, the energy is dispersed, mitigating fluctuations and the impact on fiber formation. The metal plate design ensures excellent thermal conductivity, maintaining consistent temperatures inside and outside the forming area. Furthermore, the metal plate is resistant to corrosion from a variety of solvents and exhibits good solvent adaptability.

[0068] 6. The present application adopts the design of having many circular holes on the orifice plate surface, so that after the energy of the coagulation bath liquid impacting the orifice plate surface is dispersed, the liquid can enter the area below the spinneret through the circular holes. At this time, the flow of the liquid is more uniform, so that the chemical potential difference of the coagulation bath at different times tends to be stable, thereby improving the stability of fiber forming.

[0069] 7. In this application, the bracket is located on the front and rear sides of the table, and the distance between the bracket and the straight side plate is greater than the width of the coagulation bath edge, so that the bracket can cooperate with the straight side plate and the device is accurately fixed on the edge of the coagulation bath.

[0070] According to the above technical features, the working principle of the coagulation bath buffering and stabilizing flow device for hollow fiber spinning provided by this application in actual application scenarios is as follows:

[0071] like Figure 4 As shown, Figure 4 A is the coagulation bath, B is the spinneret, C is the fiber, D is the liquid, and E is the arrow indicating the flow direction of liquid A.

[0072] Before spinning begins, the device is placed directly above the coagulation bath A, so that the first side plate 13 of the recovery plate 10 and the fixing part 30 are fixed exactly on the edge of the coagulation bath A, and the plane is directly above the edge of the coagulation bath A. At the same time, the device needs to be positioned directly below the spinneret B.

[0073] After spinning begins, the fiber C passes through the entry position 11 of the recovery plate 10, is hooked out below the right orifice plate 20, and is stuck on the take-up wheel. During the entire process, it is confirmed that the spinneret holes are located directly below the recovery plate 2 and do not fall onto the second side plate 14.

[0074] The coagulation bath circulation is turned on and the rate is increased, and the coagulation bath liquid begins to flow. As shown by arrow E, liquid D in coagulation bath tank A flows from left to right, which makes the liquid tend to be uniform. The orifice plate 20 can effectively cope with the large impact of the liquid and has good thermal conductivity, which will not cause temperature differences on both sides of the orifice plate 20. The circular hole 21 provides a channel for the liquid to flow in. Through the porous buffer, the fluctuation of the liquid is reduced, and the molding stability of the fiber is improved.

[0075] After a long period of continuous spinning, the second side plate 14 allows the volatile solvent to cool on the surface and then flow back into the coagulation bath along the inclined side plate, thereby improving solvent utilization, reducing cleaning times, and eliminating cleaning dead corners.

[0076] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on the several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0077] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A coagulation bath buffer and flow stabilization device for hollow fiber spinning, the coagulation bath buffer and flow stabilization device being arranged on a coagulation bath tank, characterized in that: include; A recovery plate (10), the recovery plate (10) being arranged on the coagulation bath, and the recovery plate (10) being provided with an entry position (11) toward the coagulation bath; Orifice plates (20), two of the orifice plates (20) are relatively arranged at the two ends of the recovery plate (10) in a first direction, and the first direction is the length direction of the coagulation bath; the upper part of the orifice plate (20) is connected to the recovery plate (10), and the bottom end of the orifice plate (20) extends into the coagulation bath, the width of the orifice plate (20) matches the width of the coagulation bath, and the orifice plate (20) is provided with a plurality of circular holes (21), and the plurality of circular holes (21) are evenly distributed.

2. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 1, characterized in that: The recovery plate (10) is provided with a plurality of guide surfaces (12), and the guide surfaces (12) form a certain angle with the horizontal plane.

3. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 2, characterized in that: The recovery plate (10) comprises: First side plates (13), two first side plates (13) are arranged opposite to each other in a second direction, and the second direction is perpendicular to the first direction; a second side plate (14) disposed between the two first side plates (13), the two second side plates (14) being disposed opposite to each other in a first direction, the two first side plates (13) and the two second side plates (14) forming a return-shaped structure, the entry position (11) being located in the middle of the return-shaped structure, and the guide surface (12) being located on the second side plate (14); The two orifice plates (20) are respectively arranged on the outer walls of the two second side plates (14).

4. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 3, characterized in that: The first side plate (13) is a straight side plate, and the first side plate (13) is arranged vertically; The second side plate (14) is an inclined side plate, the second side plate (14) is tilted, and the second side plate (14) forms a certain angle with the horizontal plane.

5. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 3, characterized in that: The side of the recovery plate (10) with a circular structure facing away from the coagulation bath is a plane, the top end of the guide surface (12) is connected to the plane, and the bottom end of the guide surface (12) extends to the entry position (11).

6. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 3, characterized in that: The included angle β between the guide surface (12) and the horizontal line is 60°>β>15°.

7. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to any one of claims 1 to 6, characterized in that: The coagulation bath buffering and stabilizing flow device further includes a fixing member (30); The fixing member (30) is arranged on the recovery plate (10) and is connected to the coagulation bath.

8. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 7, characterized in that: The two fixing members (30) are respectively arranged on both sides of the recovery plate (10); the fixing members (30) are clamping members, and the fixing members (30) are clamped with the top of the coagulation bath.

9. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 1, characterized in that: The coagulation bath buffering and stabilizing flow device further includes a guide component (40); The guide assembly (40) is arranged at the bottom end of the orifice plate (20), and the fiber is slidably connected to the outer wall of the guide assembly (40).

10. The coagulation bath buffering and flow stabilizing device for hollow fiber spinning according to claim 9, characterized in that: A groove (22) is provided at the lower portion of the orifice plate (20), and the guide assembly (40) is arranged in the groove (22). The guide assembly (40) comprises: A roller (41), wherein the roller (41) is disposed in the groove (22), and a bottom end of the roller (41) is lower than a bottom end of the orifice plate (20); A rotating shaft (42), both ends of the roller (41) in the length direction are rotatably connected to the inner wall of the groove (22) through the rotating shaft (42).

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