CN120138817A - Aramid spinning forming device and method - Google Patents
Aramid spinning forming device and method Download PDFInfo
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- CN120138817A CN120138817A CN202510410118.XA CN202510410118A CN120138817A CN 120138817 A CN120138817 A CN 120138817A CN 202510410118 A CN202510410118 A CN 202510410118A CN 120138817 A CN120138817 A CN 120138817A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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Abstract
本发明的实施例涉及一种芳纶纺丝成形装置和方法，属于纤维纺丝技术领域。装置包括喷丝部、U型沉淀管和沉淀槽；U型沉淀管的两端分别为入口端和出口端；沉淀槽连接于U型沉淀管的入口端，且U型沉淀管的入口端贯穿沉淀槽的底部并延伸至沉淀槽内；沉淀槽形成有沉淀液入口，用于向U型沉淀管内输送沉淀液；喷丝部设置于U型沉淀管的入口端的上方，喷丝部用于向U型沉淀管内输送纺丝原料浆液，使纺丝原料浆液在沉淀液中固化形成初生纤维束；其中，U型沉淀管为波纹管状，U型沉淀管的内表面形成有波纹结构，当初生纤维束移动经过U形波纹管状的U型沉淀管底部弯曲部分时，初生纤维束与波纹结构顶部相切，用于提高初生纤维束内外层的固化均匀性。
The embodiment of the present invention relates to an aramid spinning forming device and method, belonging to the field of fiber spinning technology. The device includes a spinning part, a U-shaped precipitation tube and a precipitation tank; the two ends of the U-shaped precipitation tube are respectively an inlet end and an outlet end; the precipitation tank is connected to the inlet end of the U-shaped precipitation tube, and the inlet end of the U-shaped precipitation tube passes through the bottom of the precipitation tank and extends into the precipitation tank; the precipitation tank is formed with a precipitation liquid inlet for conveying the precipitation liquid into the U-shaped precipitation tube; the spinning part is arranged above the inlet end of the U-shaped precipitation tube, and the spinning part is used to convey the spinning raw material slurry into the U-shaped precipitation tube, so that the spinning raw material slurry is solidified in the precipitation liquid to form a primary fiber bundle; wherein the U-shaped precipitation tube is a corrugated tube, and a corrugated structure is formed on the inner surface of the U-shaped precipitation tube, and when the primary fiber bundle moves through the bottom curved part of the U-shaped corrugated tube-shaped U-shaped precipitation tube, the primary fiber bundle is tangent to the top of the corrugated structure, which is used to improve the solidification uniformity of the inner and outer layers of the primary fiber bundle.
Description
The invention relates to an invention patent application taking the prior patent application of an aramid spinning forming device and method as a priority basis, wherein the application number is 202510004222.9 and the application number is 2025, 01 and 02.
Technical Field
The invention relates to the technical field of fiber spinning, in particular to an aramid fiber spinning forming device and method.
Background
Wet spinning and dry-wet spinning are methods commonly used for chemical fiber spinning at present. In the wet spinning and dry-wet spinning processes, the spinning solution is gradually solidified under the action of the precipitation solution in the precipitation tank after being extruded from the spinneret plate to form a nascent fiber bundle.
However, since the curing agent concentration is not uniform at the center and the periphery of the primary fiber bundle, the degree of curing of the filaments is not uniform at the center and the periphery of the primary fiber bundle, and thus the problem of uneven thickness and performance of the whole fiber bundle is generated. In addition, most of the prior sedimentation tanks have an open square tank structure, so that the sedimentation liquid is easy to volatilize to cause resource waste.
Disclosure of Invention
In view of the above analysis, the embodiment of the invention aims to provide an aramid fiber spinning forming device and method, which are used for solving at least one of the problems of uneven performances of a primary fiber bundle center and an outer layer fiber in the existing spinning process, large volatilization area of an existing precipitation tank and the like.
The embodiment of the invention provides an aramid fiber spinning forming device which comprises a spinning part, a U-shaped sedimentation tube and a sedimentation tank, wherein two ends of the U-shaped sedimentation tube are respectively provided with an inlet end and an outlet end, the sedimentation tank is fixed at the inlet end of the U-shaped sedimentation tube, the inlet end of the U-shaped sedimentation tube penetrates through the bottom of the sedimentation tank and extends into the sedimentation tank, a sedimentation liquid inlet is formed in the sedimentation tank and is used for conveying sedimentation liquid into the U-shaped sedimentation tube, the spinning part is arranged above the inlet end of the U-shaped sedimentation tube and is used for conveying spinning raw material slurry into the U-shaped sedimentation tube, the spinning raw material slurry is solidified in the sedimentation liquid to form a primary fiber bundle, the inner surface of the U-shaped sedimentation tube is corrugated, and when the primary fiber bundle moves through the bottom bending part of the U-shaped sedimentation tube, the primary fiber bundle is tangent to the top of the corrugated structure and is used for improving solidification uniformity of the inner layer and the outer layer of the primary fiber bundle.
Further, the corrugated structure comprises a plurality of annular protruding portions formed on the inner surface of the U-shaped sedimentation tube, the plurality of annular protruding portions are evenly distributed at intervals along the length direction of the U-shaped sedimentation tube, and annular grooves are formed among the plurality of annular protruding portions.
Further, the wavelength of the corrugated structure is 5-150 mm, and the groove depth of the corrugated structure is 5-100 mm.
Further, the wavelength of the corrugated structure is 5-15 mm, and the depth of the groove of the corrugated structure is 5-10 mm.
Further, the center of the spinning part and the center of the inlet end of the U-shaped sedimentation pipe are positioned on the same vertical line, and a funnel-shaped guiding part is formed at the inlet end of the U-shaped sedimentation pipe.
Further, the inlet end of the U-shaped sedimentation tube is higher than the outlet end of the U-shaped sedimentation tube.
Further, the position of the inlet end of the U-shaped sedimentation pipe is fixed, and the height of the outlet end of the U-shaped sedimentation pipe is adjustable and is used for adjusting the height difference between the inlet end and the outlet end.
Further, the height difference between the inlet end and the outlet end of the U-shaped sedimentation tube is set according to the flow rate of the sedimentation liquid during spinning.
Further, the outlet end of the U-shaped sedimentation pipe is fixedly provided with a sedimentation liquid outlet collecting tank, the outlet end of the U-shaped sedimentation pipe penetrates through the bottom of the sedimentation liquid outlet collecting tank and extends into the sedimentation liquid outlet collecting tank, and a sedimentation liquid outlet is formed at the bottom of the sedimentation liquid outlet collecting tank.
The embodiment of the invention also provides an aramid fiber spinning forming method which can be realized by adopting the spinning forming device of the embodiment, and the spinning forming method comprises the following steps:
controlling the precipitation liquid to be continuously conveyed into the U-shaped precipitation pipe;
Controlling the continuous conveying of the spinning raw material slurry to the spinning part, extruding the spinning raw material slurry from the spinning part into a U-shaped sedimentation pipe, solidifying the spinning raw material slurry under the action of the sedimentation liquid to form a raw fiber yarn, and enabling the raw fiber yarn to flow through the U-shaped sedimentation pipe along with the sedimentation liquid and flow out from the outlet end of the U-shaped sedimentation pipe;
Drawing the raw fiber yarn flowing out from the outlet end to a spinning disk to finish spinning raw fiber yarn;
normal spinning is started, and the spinning raw material slurry is pulled through a spinning disk to solidify to form a nascent fiber bundle.
The invention can at least realize one of the following beneficial effects:
1. Compared with the traditional rectangular sedimentation tank, the U-shaped sedimentation tank is adopted as the sedimentation tank, so that the evaporation area of the sedimentation liquid can be greatly reduced, and energy conservation and consumption reduction can be realized.
2. According to the invention, the inner wall of the U-shaped sedimentation tube is designed into a corrugated structure, and the nascent fiber bundle slides over the top of the corrugated structure on the inner surface of the U-shaped sedimentation tube, so that the material exchange around the fiber bundle can be accelerated, the update and exchange of the environmental liquid inside and outside the fiber bundle are promoted, the consistency of the sedimentation environments of different single fibers in the fiber bundle is ensured, the concentration difference of a solvent and a curing agent in the fiber sedimentation environment of the inner layer and the outer layer of the fiber bundle is further reduced, and the deviation value of the performance of the fiber bundle is reduced.
3. The sediment liquid in the grooves of the ripple structure is continuously swirled and updated, so that the primary fiber can be lubricated, and the friction between the primary fiber and the inner wall is reduced.
4. The invention designs the inner wall of the U-shaped sedimentation tube into a corrugated structure, so that the primary fiber bundle is continuously tangent with the top of the corrugated structure, the traction tension of the primary fiber bundle along the opposite direction of spinning is smaller and smaller, and the stretching ratio is prevented from being concentrated at the part near the micropores of the weak spinning part.
5. The U-shaped sedimentation tube adopts a uniformly distributed corrugated structure, so that the stretching ratio of the primary fiber bundle in the sedimentation process can be differentially distributed along the length direction of the fiber bundle, the tension applied to the primary fiber bundle is ensured, and the friction force between the primary fiber bundle and the top of the corrugated structure on the inner wall of the U-shaped sedimentation tube is gradually reduced from a spinning disc to a spinning part, so that the stability of spinning is facilitated. The strength of the nascent fiber extruded from the spinning part is lowest, and the nascent fiber cannot bear excessive tensile force, while the tensile strength of the nascent fiber gradually increases along with the increase of the solidification degree of the nascent fiber in the precipitation liquid, can bear larger tensile force, and is not easy to break.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
Fig. 1 is a schematic structural view of an aramid fiber spinning forming apparatus according to some embodiments of the present invention.
Fig. 2 is a partial schematic view of a U-shaped settling tube, according to some embodiments of the invention.
FIG. 3 is a schematic diagram of a stress analysis of a nascent fiber bundle according to some embodiments of the invention.
Fig. 4 is a schematic structural view of a settling tank according to some embodiments of the present invention.
Fig. 5 is a schematic process flow diagram of the dry-wet spinning process for preparing meta-aramid fiber of example 1.
FIG. 6 is a schematic diagram of the process flow of preparing para-aramid fiber by dry-wet spinning in example 3.
Reference numerals illustrate:
10. The spinning machine comprises a spinning part, a U-shaped sedimentation pipe, a corrugated structure, a guide part, a sedimentation tank, a 31 overflow tank, a 311 liquid outlet, a 32 closed accommodating cavity, a 33 perforated plate, a 331 stationary flow hole, a 34 sedimentation liquid inlet, a 40 spinning disk, a 50 sedimentation liquid outlet collecting tank and a1 nascent fiber bundle.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification.
It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, while other details not greatly related to the present invention are omitted.
In the processes of wet spinning and dry-wet spinning, spinning raw material slurry is extruded from micropores of a spinneret plate, and a solvent in the spinning raw material slurry and a curing agent in a precipitation solution are subjected to substance exchange and gradually cured to form nascent fibers. The solidification speed and the microcosmic compactness of the nascent fiber depend on the mass exchange speed and the stretching ratio, and the larger the stretching ratio is, the faster the solidification is, the less compact the microcosmic structure is, the more micropores are, and the poorer the mechanical property of the fiber product is. Therefore, the uniformity of solidification of the different filaments in the as-spun fiber bundle and the distribution of the draw ratio of the same filaments are critical in determining the stability of the spinning process and the properties of the fibers.
To this end, an embodiment of the present invention provides an aramid fiber spinning forming apparatus, as shown in fig. 1, which includes a spinning part 10, a U-shaped settling tube 20, and a settling tank 30. The two ends of the U-shaped sedimentation tube 20 are respectively an inlet end and an outlet end, the sedimentation tank 30 is connected to the inlet end of the U-shaped sedimentation tube, the inlet end of the U-shaped sedimentation tube 20 penetrates through the bottom of the sedimentation tank 30 and extends into the sedimentation tank 30, and the sedimentation tank 30 is formed with a sedimentation liquid inlet for conveying sedimentation liquid into the U-shaped sedimentation tube 20. The spinning section 10 is disposed above the inlet end of the U-shaped settling tube 20, and the spinning section 10 is configured to convey the spinning raw material slurry into the U-shaped settling tube 20, so that the spinning raw material slurry is solidified in the settling liquid to form the nascent fiber bundle 1.
In the embodiment of the present invention, the U-shaped settling tube 20 is bellows-shaped, and as shown in fig. 2, the inner surface of the U-shaped settling tube 20 is formed with a bellows structure 21, and as the primary fiber bundle moves through the bottom curved portion of the bellows-shaped U-shaped settling tube 20, the primary fiber bundle is tangent to the top of the bellows structure 21 for improving the curing uniformity of the inner and outer layers of the primary fiber bundle.
During the curing of the as-spun fibers, the curing agent in the precipitation solution diffuses from the periphery to the center of the fiber bundle, and the solvent diffuses from the center to the periphery. Therefore, the curing agent concentration at the periphery is high and the solvent concentration is low in the cross section of the nascent fiber bundle, while the curing agent concentration is low in the center and the solvent concentration is high. The filaments at the periphery of the fiber bundle solidify faster than at the center because the concentration of precipitant at the periphery of the fiber bundle is relatively higher and the concentration of solvent is relatively lower.
Therefore, the inner wall of the U-shaped sedimentation tube is designed to be of a corrugated structure, the nascent fiber bundle slides over the top of the corrugated structure on the inner surface of the U-shaped sedimentation tube, so that the material exchange around the fiber bundle can be quickened, the update and exchange of the environmental liquid inside and outside the fiber bundle are promoted, the consistency of the sedimentation environments of different single fibers in the fiber bundle is ensured, the concentration of the curing agent and the concentration of the solvent are uniformly diffused, the concentration difference between the solvent and the curing agent in the fiber sedimentation environment of the outer layer of the inner layer of the fiber bundle is further reduced, and the deviation value (Cv value) of the performance of the fiber bundle is reduced.
Simultaneously, the precipitation liquid in the corrugated structure groove continuously generates rotational flow and updates, when the primary fiber bundle moves through the U-shaped precipitation pipe, the precipitation liquid in the annular groove can lubricate the primary fiber bundle, compared with the precipitation pipe with smooth inner wall, the friction between the fiber bundle and the inner wall of the U-shaped precipitation pipe can be reduced, and broken filaments and flying filaments are reduced.
And, when the nascent fiber bundle passes through the bottom bending part of the U-shaped sedimentation tube 20, the nascent fiber bundle is rubbed with the top of the corrugated structure and turns, and the 180-degree turning angle is differentiated into a plurality of small turning angles in the turning process, so that compared with the traditional wire guide, the wire breakage and wire winding are not easy to generate.
In addition, the U-shaped sedimentation pipe is adopted as the sedimentation tank, so that the evaporation area of the sedimentation liquid can be greatly reduced, and energy conservation and consumption reduction can be realized compared with the traditional rectangular sedimentation tank.
In some embodiments, as shown in fig. 1, the spin-forming apparatus further includes a spin disk 40 disposed above the outlet end of the U-shaped precipitation tube 20 for drawing the primary fiber bundles such that the primary fiber bundles formed in the U-shaped precipitation tube are continuously drawn out.
The solidification of the nascent fiber is started from the micropore extrusion of the spinning part, and the solidification degree and the strength are gradually increased in the process that the fiber moves through the U-shaped sedimentation tube. Therefore, the strength of the nascent fiber is lowest at the micropores of the spinning part, and the outlet end of the U-shaped sedimentation tube is highest. Excessive tension cannot be born at micropores of the spinning part, or broken filaments, glue blocks, column head filaments and the like are easy to generate. In order to improve the mechanical properties of the fibers, the degree of orientation of the polymer molecular chains in the fibers must be increased, and the draw ratio of the fibers must be increased. Draw ratio is the difference in the speed of the fibers at the spin disk 40 and the spinneret 10 and the draw ratio distribution describes the extent of drawing or the distribution of deflection of the fibers at various portions or locations during the drawing process.
In order to reasonably distribute the stretching ratio of the primary fiber, the invention adopts the precipitation pipe with a corrugated structure, so that the primary fiber rubs with the top of the corrugated structure when passing through the bending part at the bottom of the U-shaped precipitation pipe 20, the traction tension of the primary fiber bundle in the opposite direction of spinning is smaller and smaller, and the stretching ratio is prevented from being concentrated at the part near the micropores of the weak spinning part.
Specifically, as shown in fig. 3, the direction from the spinning disk 40 to the spinning section 10 is assumed that the as-spun fiber bundle 1 receives frictional resistance of F1, F2, F3 and F1, F2, F3 in this order at the top of the corrugated structure 21, the as-spun fiber bundle receives tensile force of F1, F2, F3 and F1, without regard to liquid drag, buoyancy, gravity of the as-spun fiber bundle itself, f1=f1+f2, f2=f2+f3, f1=f1+f2, f2=f2+f3. It can be seen that F1> F2> F3>. Therefore, the invention can ensure that the stress of the primary fiber near the spinning part is minimum by arranging the corrugated structure, thereby reducing the stretching ratio of the primary fiber in the area and being beneficial to the stability of spinning.
In some embodiments, the corrugated structure 21 includes a plurality of annular protrusions formed on the inner surface of the U-shaped settling tube, the plurality of annular protrusions being uniformly and alternately distributed along the length direction of the U-shaped settling tube, and annular grooves being formed between the plurality of annular protrusions, thereby forming the corrugated structure of the inner surface of the U-shaped settling tube.
The U-shaped sedimentation tube adopts a uniformly distributed corrugated structure, so that the stretching ratio of the primary fiber bundle in the sedimentation process can be differentially distributed along the length direction of the fiber bundle, the tension applied to the primary fiber bundle is ensured, the direction from a spinning disc to a spinning part is gradually reduced, and the stability of spinning is facilitated.
In some embodiments, the corrugation 21 may be arcuate, square, triangular, etc., preferably arcuate.
In some embodiments, as shown in FIG. 2, the wavelength lambda of the corrugated structure is 5-150 mm, e.g., 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, etc., and the groove depth H of the corrugated structure is 5-100 mm, e.g., 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc.
The invention prevents the corrugated structure from being arranged too densely or the grooves are too shallow by controlling the wavelength and the groove depth of the corrugated structure in a proper range, so that the primary fiber bundle can not be fully lubricated by the precipitation liquid in the annular groove, and simultaneously prevents the corrugated structure from being arranged too sparsely, so that the stretching ratio of the primary fiber bundle can not be well distributed in a differential mode, and the stretching uniformity of the primary fiber bundle is influenced.
Preferably, the wavelength lambda of the corrugated structure is 5-15 mm, for example, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm and the like, and the groove depth H of the corrugated structure is 5-10 mm, for example, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm and the like.
In some embodiments, the length of the U-shaped precipitation tube 20 is not less than 80cm to ensure that the spinning feedstock slurry filaments extruded from the spinneret 10 form a primary fiber bundle of sufficient solidification after gradual solidification through the U-shaped precipitation tube 20.
In some embodiments, the diameter of the U-shaped precipitation tube 20 is determined according to the outer diameter of the spinneret 10 and the thickness of the produced fiber bundle product, so that the diameter of the U-shaped precipitation tube is not smaller than the outer diameter of the spinneret 10, and it is ensured that the filaments extruded by the spinneret 10 can enter the U-shaped precipitation tube smoothly.
In some embodiments, the center of the spinning portion 10 and the center of the inlet end of the U-shaped settling tube 20 are located on the same vertical line, and a funnel-shaped guiding portion 22 is formed at the inlet end of the U-shaped settling tube 20, so that primary fibers extruded by micropores of the spinning portion 10 enter from the center of the funnel-shaped guiding portion 22, are gradually bundled and descending, pass through the vertical section of the U-shaped settling tube, and then are tangent to the top of the corrugated structure (i.e., the annular protruding portion) at the position where the bottom of the U-shaped settling tube starts to be bent, and the problem that the primary fibers with lower solidification degree rub against the corrugated structure in the vertical section of the U-shaped settling tube, so that breakage, flying of the primary fiber bundles occurs, and the like is avoided.
In some embodiments, a certain interval is provided between the spinning part 10 and the top end of the guide part 22, so that spinning is performed through a dry-wet spinning process, and the spinning raw material slurry is extruded from the spinning part 10, passes through a certain air layer, and enters into the precipitation liquid in the U-shaped precipitation tube.
In some embodiments, the spinning section 10 is immersed in the precipitation solution in the guiding section 22, and the spinning raw material slurry directly enters the precipitation solution to be solidified after being extruded from the spinning section 10, so that wet spinning is realized.
In some embodiments, the precipitation tank 30 is formed with a precipitation liquid inlet through which precipitation liquid enters the precipitation tank 30 and flows into the U-shaped precipitation pipe 20, so that the direct connection of the precipitation liquid conveying pipeline with the U-shaped precipitation pipe 20 is avoided, and the primary fibers extruded by the spinning nozzle 10 are prevented from entering the U-shaped precipitation pipe 20.
In some embodiments, as shown in fig. 4, a porous plate 33 is provided in the precipitation tank 30, the porous plate 33 is parallel to the bottom surface of the precipitation tank 30, and the height of the porous plate 33 is lower than the top of the guide 22. The interior of the precipitation tank 30 is partitioned by a porous plate 33 such that the bottom of the precipitation tank 30 is formed with a closed accommodation chamber 32. The porous plate 33 is provided with a plurality of stabilizing holes 331 so that the closed accommodating chamber 32 communicates with the accommodating space above the porous plate 33. A precipitation fluid inlet 34 is formed at the bottom of the closed accommodation chamber 32.
In this embodiment, the precipitating solution can be conveyed into the closed accommodating cavity 32 through the precipitating solution inlet 34, flows into the accommodating space above through the plurality of stabilizing holes 331, and finally flows into the precipitating pipe 20 through the guide part 22, so that when the precipitating solution is conveyed, a buffer space is provided for the precipitating solution through the closed accommodating at the bottom, and the precipitating solution can be prevented from causing larger impact and fluctuation to the liquid in the precipitating tank 30, thereby affecting the solidification and formation of the spinning raw material slurry in the precipitating solution and affecting the stability of the spinning process.
Wherein, a plurality of steady flow holes 331 are evenly distributed on the porous plate 33, can evenly distribute the precipitation liquid into a plurality of pore canals, make liquid flow into the accommodation space above in a comparatively steady mode, avoid turbulent flow and mixing because of liquid direct impact, greatly reduced the fluctuation of precipitation liquid in the precipitation tank.
Specifically, the plurality of stabilizing holes 331 may be uniformly distributed in the porous plate 33 in a circular array, for example, the plurality of stabilizing holes 331 are uniformly distributed on a plurality of concentric rings along the circumferential direction of the porous plate 33, and the plurality of concentric rings are uniformly distributed on the porous plate 33 around the guide portion 22.
In some embodiments, as shown in fig. 4, an overflow tank 31 is provided at the outer side of the settling tank 30, and the overflow tank 31 is fixed to the side of the settling tank 30 for collecting the settling liquid overflowed from the settling tank 30. In the spinning process, the liquid level of the precipitation liquid is difficult to control, the precipitation liquid possibly rises and even overflows the precipitation tank 30, and the overflow tank 31 is arranged outside the precipitation tank 30, so that the overflow precipitation liquid is collected.
Specifically, as shown in fig. 4, the overflow groove 31 is annular, surrounds the outside of the sedimentation groove 30 along the circumferential direction of the sedimentation groove 30, and the top edge of the overflow groove 31 is flush with the top edge of the sedimentation groove 30, so that when the sedimentation liquid in the sedimentation groove 30 overflows from the top of the sedimentation groove 30, the sedimentation liquid can completely flow into the overflow groove 31, and collection of the sedimentation liquid is realized.
In some embodiments, as shown in fig. 4, the overflow tank 31 is provided with a liquid outlet 311, and the liquid outlet 311 can be connected with the precipitating liquid storage container, so that the precipitating liquid can flow back into the precipitating liquid storage container, and recycling of the precipitating liquid is realized.
In some embodiments, as shown in fig. 1, the inlet end of the U-shaped precipitation tube 20 is higher than the outlet end of the U-shaped precipitation tube 20, so that the natural flow of the precipitation liquid in the U-shaped precipitation tube 20 can be promoted, the precipitation liquid can smoothly flow out from the outlet end, and the stability of the precipitation liquid in the spinning process can be maintained.
In some embodiments, the inlet end of the U-shaped settling tube 20 is fixed in position, and the height of the outlet end of the U-shaped settling tube 20 is set to be adjustable to adjust the height difference between the inlet end and the outlet end. Specifically, the outlet end of the U-shaped settling tube 20 may be fixed at different heights, thereby realizing adjustment of the height difference between the inlet and the outlet.
In some embodiments, the difference in height between the inlet end and the outlet end of the U-shaped precipitation tube 20 is set according to the desired flow rate of precipitation fluid during spinning. The invention sets the outlet end of the U-shaped sedimentation pipe 20 to be adjustable, and adjusts the height difference between the inlet end and the outlet end of the U-shaped sedimentation pipe according to the flow of the sedimentation liquid, thereby realizing the transportation of different sedimentation liquid flows.
It should be noted that, the U-shaped sedimentation tube 20 of the present invention adopts a bellows type, so that the U-shaped sedimentation tube 20 has a certain scalability, and thus the height of the outlet end can be adjusted.
In some embodiments, as shown in fig. 1, the outlet end of the U-shaped precipitation pipe 20 is provided with a precipitation liquid outlet collecting tank 50, the outlet end of the U-shaped precipitation pipe 20 penetrates through the bottom of the precipitation tank 50 and extends into the precipitation liquid outlet collecting tank 50, and a precipitation liquid outlet is formed at the bottom of the precipitation liquid outlet collecting tank 50, so that the precipitation liquid flowing out of the outlet end of the U-shaped precipitation pipe 20 enters the precipitation liquid outlet collecting tank 50 and flows out of the precipitation liquid outlet at the bottom, thereby facilitating the collection of the precipitation liquid flowing out of the outlet end of the U-shaped precipitation pipe 20.
In some embodiments, the materials of the U-shaped precipitation tube 20, precipitation tank 30, and precipitation liquid outlet collection tank 50 may be selected from corrosion-resistant materials, such as PP, polytetrafluoroethylene, and the like.
The embodiment of the invention also provides an aramid fiber spinning forming method which is suitable for the spinning forming device of the embodiment, and comprises the following steps:
controlling the precipitation liquid to be continuously conveyed into the U-shaped precipitation pipe;
Controlling the continuous conveying of the spinning raw material slurry to the spinning part, extruding the spinning raw material slurry from the spinning part into a U-shaped sedimentation pipe, solidifying the spinning raw material slurry under the action of the sedimentation liquid to form raw fiber filaments, and enabling the raw fiber filaments to flow through the U-shaped sedimentation pipe along with the sedimentation liquid and flow out from an outlet end;
Drawing the raw fiber yarn flowing out from the outlet end to a spinning disk to finish spinning raw fiber yarn;
And (3) starting normal spinning, and drawing a primary fiber bundle formed by solidifying the spinning raw material slurry through a spinning disk.
In some embodiments, the flow rate of the precipitation liquid can be increased when spinning the raw fiber, so that the raw fiber can smoothly pass through the U-shaped precipitation pipe along with the precipitation liquid, and the raw fiber is prevented from being led out of the U-shaped precipitation pipe by using an additional component. In the subsequent normal spinning process, the nascent fiber bundles are pulled by the spinning disk, and are not required to be conveyed by the flow of the precipitation liquid, and the flow of the precipitation liquid can be reduced.
The spinning forming device of the present invention will be further described with reference to specific examples.
Example 1
The meta-aramid fiber was prepared by dry and wet spinning according to the process flow shown in fig. 5. Wherein the spinning raw material slurry used is a solution of poly (m-phenylene isophthalamide) with a solid content of 18 percent in a solvent dimethylacetamide. The spinning raw material slurry in the spinning solution storage tank is conveyed to the spinning part at room temperature through a metering pump, wherein the flow rate of the metering pump is 0.3 milliliter/rotation, and the rotating speed is 16 rotations/minute. The number of micropores on the spinning part is 36, and the aperture is 0.1mm. The precipitation bath was a 40% N, N-dimethylacetamide precipitation solution, and the precipitation bath was conducted at room temperature with a precipitation length of 80cm. The stretching ratio of the spinning part is 150%, the fiber is plasticized and stretched 2.5 times in the drying process, and is thermally stretched 2.5 times in the thermal stretching process, and the heat treatment temperature is 340 ℃ in the heat setting process.
Wherein a spinning forming device as shown in fig. 1 is used in the precipitation bath. As shown in FIG. 2, in the spinning forming apparatus, the U-shaped sedimentation tube had an inner diameter D of 20mm, an outer diameter D of 30mm, a corrugated structure of circular arc shape, a wavelength lambda of 15mm, and a groove depth H of 5mm.
Example 2
The present embodiment differs from embodiment 1 in that the wavelength λ of the corrugated structure is 60mm.
Example 3
Para-aramid fiber was prepared by dry and wet spinning according to the process flow shown in fig. 6. A spinning solution of 18% concentration formed by dissolving poly-p-phenylene terephthalamide in concentrated sulfuric acid is used, and the spinning solution is subjected to vacuum defoamation and filtration and then is conveyed to a spinning part through a metering pump, wherein the number of micropores of the spinning part is 200, and the pore diameter is 80 mu m. The spinning dope is extruded from a spinning part, passes through an air layer and then enters a precipitation bath for precipitation to form nascent fibers, wherein the precipitation bath adopts dilute sulfuric acid with concentration of 8%, the temperature of the precipitation bath is 20 ℃, the length of the precipitation bath is 100cm, and the stretching ratio is 4. The nascent fiber is coiled to form para-aramid fiber after neutralization, washing, drying and oiling.
The spinning forming device shown in fig. 1 was used for the precipitation bath. Wherein, the internal diameter D of U type sedimentation tube is 30mm, and external diameter D is 40mm, and corrugated structure is convex, and wavelength lambda is 12mm, and recess degree of depth H is 8mm.
Comparative example 1
The difference between this comparative example and example 1 is that the inner wall of the settling tube has no corrugated structure.
The fiber bundles of example 1 and comparative example 1 were tested for single fiber fineness, strength, and elongation at break. The test results are shown in Table 1. As shown in Table 1, compared with the precipitation tank without the corrugated structure, the U-shaped precipitation pipe with the corrugated structure is adopted for precipitation bath, the deviation value (Cv value) of the single fiber fineness, strength and elongation at break of the fiber bundle is obviously reduced, and the uniformity of fiber performance is obviously improved.
Table 1 fiber properties and property Cv values of each of examples and comparative examples
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
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