A wet spinning forming method, a preparation method and a forming device

Abstract

This invention discloses a wet spinning forming method. The spinning solution enters a spinneret and is then ejected from multiple small holes arranged on the surface of the spinneret, forming in a coagulation bath. A conductive sheet between the sidewall of the spinneret and the spinneret cap conducts the charge accumulated on the spinneret surface. This invention utilizes the conductive sheet between the spinneret and the spinneret cap to conduct the charge accumulated on the spinneret surface, effectively controlling the adverse effects of potential difference during spinning, reducing deposits on the spinneret surface, lowering the spinneret replacement frequency, improving spinnability, and thus improving spinning quality. This invention also discloses a wet spinning preparation method and a wet spinning forming apparatus.

Description

Technical Field

[0001] This invention relates to the field of polyvinyl alcohol fiber manufacturing, specifically to a wet spinning forming method, preparation method, and forming apparatus. Background Technology

[0002] Polyvinyl alcohol fiber (PVA fiber) is a synthetic fiber made from high-polymerization-degree high-quality polyvinyl alcohol (PVA) using specific advanced technologies. Its main characteristics include high strength, high modulus, low elongation, wear resistance, acid and alkali resistance, good weather resistance, and excellent affinity and bonding with cement, gypsum, and other substrates. Furthermore, it is non-toxic, non-polluting, and does not harm human skin, making it a new generation of high-tech green building materials. The raw material for producing polyvinyl alcohol fiber is a water-soluble polymer with properties between plastics and rubber, and it has a wide range of applications.

[0003] The manufacturing process of polyvinyl alcohol (PVA) fiber mainly includes polymerization, spinning, and post-processing. First, polyvinyl alcohol (PVA) is used as a raw material. Through polymerization, vinyl alcohol monomers are linked together to form polymer chains. The polymerization reaction is typically carried out under conditions such as heating, pressure, and the addition of catalysts. During the polymerization reaction, the hydroxyl groups (-OH) in the vinyl alcohol monomers react with the hydroxyl groups of other vinyl alcohol molecules to form new ether bonds, thereby forming the polyvinyl alcohol chain.

[0004] Next, the polyvinyl alcohol solution obtained from polymerization is spun into fibers. First, the polyvinyl alcohol solution is pretreated through processes such as filtration and degassing to remove impurities. Then, the clean polyvinyl alcohol solution is injected into a spinning device, where it is heated and extruded to transform it into a soft spinning solution. Finally, a set of spinning machinery extrudes the spinning solution from fine orifices or a rotating disc to form fine filaments. During the spinning process, parameters such as temperature, pressure, and speed need to be controlled to ensure the quality of the filaments.

[0005] Finally, the fibers undergo post-processing including curing, stretching, and drying. First, the fibers are dried in an oven to remove solvents and moisture. Then, they are stretched using a stretching device to improve their strength and tensile properties. Finally, they are cured using methods such as thermosetting or chemical curing to ensure the fibers maintain a certain level of stability and durability.

[0006] The core process in polyvinyl alcohol fiber manufacturing is the spinning assembly, and the core of the spinning assembly is the spinneret. The spinneret extrudes a precisely metered spinning solution through numerous spinneret holes to create fiber bundles of a certain thickness and fine texture. Therefore, the quality of the spinneret is a crucial condition for ensuring the quality of the finished fiber and a good spinning process during the spinning process.

[0007] Chinese patent document CN104073891A discloses a spinning spinneret for chemical fiber spinning. This spinning spinneret includes a nut seat fitted onto a gooseneck tube, a spinneret nut disposed outside the nut seat, a filter plate disposed within the cavity formed between the nut seat and the spinneret nut, a filter cloth wrapped around the filter plate, and a spinneret positioned above the filter cloth. A sealing ring is provided at the contact point between the spinneret and the spinneret nut. This invention is convenient and easy to operate, effectively filtering out large particles during the spinning process and preventing clogging of the spinneret's orifices. Furthermore, the spinneret is made of oxide ceramic, which is corrosion-resistant and pressure-resistant, extending its service life and ensuring production efficiency.

[0008] Chinese patent document CN213266801U discloses a spinneret for wet spinning. The spinneret body has multiple spinneret caps, each of which is shaped like a truncated cone. Each spinneret cap has 2000-4000 nozzles, the diameter of which gradually decreases from the inside to the outside. The top of the nozzle at the bottom of the spinneret cap is hexagonal. Each nozzle has a protrusion at its nozzle opening, and the protrusion is shaped like a truncated cone. This invention can improve the spinning rate and reduce the spinning speed under the same raw materials, thereby reducing equipment requirements and ensuring product quality. The feed inlet of each nozzle is hexagonal, and the feed inlets of each nozzle are adjacent, thus greatly reducing the accumulation of raw materials in the dead corners of each nozzle's feed inlet and avoiding affecting the spinning quality. The truncated cone protrusion at the nozzle of this invention has a rounded transition, which increases the flow rate of the coagulation liquid, thereby promoting full contact between the raw liquid and the coagulation bath and improving the spinning quality.

[0009] Furthermore, Chinese patent document CN101144192A discloses a spinneret for wet spinning and its manufacturing method. This spinneret includes a spinneret spinning body and a spinneret support. The spinneret spinning body is made of precious metals such as gold, platinum, rhodium, and palladium, while the support body is made of lower-value metals such as tantalum and niobium. Compared to tantalum spinnerets, using this invention's spinneret can improve product quality, reduce raw material loss, lower overall costs, and reduce worker exposure to harmful substances. Compared to traditional integral gold, platinum, rhodium, and palladium alloy spinnerets, this invention's spinneret provides the same performance but reduces material costs, saving money for chemical fiber manufacturers.

[0010] In the aforementioned prior art, modifying the spinneret in different ways can improve the quality of spinning or extend the service life of the spinneret. However, during the use of the spinneret, sticking to the plate is prone to occur, affecting spinnability. Therefore, the spinneret needs to be replaced in time, resulting in a reduction in spinning efficiency. Summary of the Invention

[0011] To address the technical problem of spinnability caused by spinneret sticking in the prior art, this invention provides a wet spinning forming method. The spinning solution enters the spinneret and is then ejected from multiple small holes arranged on the surface of the spinneret, forming in a coagulation bath. The conductive sheet between the sidewall of the spinneret and the spinneret cap conducts the charge accumulated on the surface of the spinneret.

[0012] Studies have found that the replacement rate of polyvinyl alcohol (PVA) fiber spinnerets is directly affected by factors such as the dosing solution, coagulation solution, and spinneret itself, which directly impacts product quality, output, and worker workload, making it a long-standing and difficult technical challenge. The spinnability of PVA dosing solutions is related not only to the molecular weight distribution of PVA, the activity of VAC (vinyl acetate), and residual acetate ions, but also to impurities in the dosing solution, temperature, and the impurities, temperature, specific gravity, flow rate, and flow state in the coagulation solution, as well as the drawing in the spinning bath. Furthermore, the AC impedance and polarization of the electrochemical behavior on the spinneret's gold plate surface were studied. The wet spinning coagulation process is a double diffusion process; the inconsistent diffusion rates of positive and negative ions lead to charge accumulation and a potential difference. This potential difference directly affects spinneret adhesion and indirectly affects metal ion deposition.

[0013] Studies have investigated the electrophysiological phenomena near the spinneret orifice of the gold plate by measuring the potential of the spinneret assembly and analyzing the deposits on the gold plate surface. The results suggest that the spinneret assembly forms two parallel short-circuit battery circuits with different electromotive forces in the solidified liquid and the original liquid. The direction of the short-circuit battery current is determined based on the magnitude of the electromotive force, and the corrosion state of the spinneret assembly and the interface relationship on the gold plate surface are analyzed.

[0014] Therefore, in this invention, the conductive sheet between the spinneret and the spinneret cap is used to conduct away the charge accumulated on the surface of the spinneret, thereby dispersing the charge on the surface of the spinneret and effectively controlling the adverse effects caused by the potential difference during the spinning process. This reduces the deposits on the surface of the spinneret, lowers the frequency of spinneret replacement, and also improves spinnability, thereby improving the spinning quality.

[0015] Preferably, a corrugated conductive sheet is used to conduct the charge. This design increases the area of ​​the conductive sheet, thereby ensuring the effective conduction of the charge and improving spinnability.

[0016] Preferably, the height of the crests and troughs of the corrugated conductive sheet is greater than the gap between the spinneret sidewall and the spinneret cap. This design ensures a certain pressure between the conductive sheet and the spinneret sidewall and spinneret cap, thereby ensuring stable contact between the conductive sheet and the spinneret and spinneret cap, guaranteeing the charge conduction effect, and effectively improving spinnability.

[0017] Preferably, the width of the conductive sheet is less than the depth of the gap between the spinneret sidewall and the spinneret cap. The design of the conductive sheet width in this scheme ensures that it avoids affecting the spinneret during charge conduction, thereby guaranteeing the charge conduction effect and effectively improving spinnability.

[0018] Preferably, an elastic conductive sheet is used to conduct the charge. In this design, the elastic conductive sheet is easy to install and remove from the spinneret, thus enabling the conductive sheet to be reused.

[0019] Preferably, a copper conductive sheet is used to conduct the charge. The use of a highly conductive sheet in this design effectively conducts the charge and improves spinnability.

[0020] Preferably, a gasket is used to seal the side of the spinneret. In this design, the gasket prevents the concentrate from leaking out from the side of the spinneret, thus avoiding waste.

[0021] Preferably, the washer is a poor conductor of electricity. In this design, the washer, being a poor conductor, can avoid affecting the conduction of charge on the conductive sheet and effectively improve spinnability.

[0022] Secondly, the present invention provides a method for preparing wet spinning, comprising a filtration step in which the spinning solution is filtered after diffusion and a forming step, wherein the forming step adopts the forming method described above.

[0023] Thirdly, the present invention provides a wet spinning forming apparatus, including a spinneret assembly. The spinneret assembly includes a bell mouth connected to a spinning machine base, a spinneret cap connected to the bell mouth, and a spinneret head connected to the spinneret cap. A conductive sheet is provided between the spinneret cap and the spinneret head, and the conductive sheet is embedded in the gap between the spinneret cap and the spinneret head. The forming apparatus performs spinning forming operation using the above-mentioned forming method.

[0024] The present invention has the following beneficial effects:

[0025] 1. The wave-shaped conductive copper sheet embedded in this invention is in surface contact with the spinneret sidewall and spinneret cap, and has a certain pressure, resulting in good conductivity. It can conduct the charge accumulated on the surface of the spinneret, thereby dispersing the charge on the surface of the spinneret and effectively controlling the adverse effects caused by the potential difference during the spinning process. This reduces the deposits on the surface of the spinneret, lowers the replacement frequency of the spinneret, and also improves spinnability, thereby improving the spinning quality.

[0026] 2. This invention uses conductive connections between the spinneret, spinneret cap, bell mouth, and spinning machine base to conduct away the charge on the surface of the spinneret, reduce deposits on the surface of the spinneret, and improve spinnability.

[0027] 3. The conductive sheet in this invention can be reused, which can reduce the cost of the conductive sheet. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the spinneret assembly in an embodiment of a wet spinning forming method, preparation method, and forming device according to the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the conductive sheet in the middle;

[0030] Figure 3 This is a top view of the spinneret assembly. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method:

[0032] 1. Definition

[0033] Spinneret: A precision component on a chemical fiber spinning machine, also known as the spinning head. The spinneret is generally cap-shaped, round, or corrugated, with many uniformly sized orifices on its surface. During spinning, the spinning solution or melt passes through these micro-orifices, being forced into the coagulation bath or air in a fine stream, where it solidifies or cools to become fiber. The spinneret, distribution plate, and filter material together form the spinneret assembly. The distribution plate evenly disperses the sizing solution or melt into many tiny orifices. The filter material is used to filter out impurities. The spinneret is the most important component, directly affecting the quality of the finished yarn. Depending on the spinning method, spinnerets are classified into three types: melt spinning, wet spinning, and dry spinning. Melt spinning spinnerets are generally round, hence also called spinnerets, but rectangular ones also exist. Round spinnerets are made of high-temperature resistant stainless steel, with a simple structure and easy manufacturing. The orifice diameter on the spinneret used for melt spinning depends on the fiber type and spinning conditions, generally ranging from 0.2 to 0.5 mm. Spinnerets for long filament spinning typically have dozens of holes, while those for palm fiber have one hole. For short fiber spinning, the number of holes can range from 400 to 2000. Wet spinning spinnerets are mainly cap-shaped (also called spinneret caps), but also come in disc and plate (corrugated) shapes, made of highly corrosion-resistant gold-platinum alloys or metals such as titanium, niobium, tantalum, and stainless steel. Spinnerets with fewer holes are used for long filament spinning, but large-area, multi-hole spinnerets are required for short fiber spinning, with the number of holes reaching 20,000 to 150,000. Due to the large number of holes, they can be combined into several spinnerets mounted on the same stainless steel base plate. The orifice diameter of wet spinning spinnerets is smaller than that of melt spinning spinnerets, typically 0.05–0.1 mm. Commonly used dry spinning spinnerets (plates) are cap-shaped and round, with orifice diameters of 0.07–0.16 mm and 300–1200 holes, made of stainless steel or special alloy steel.

[0034] Spinneret: A precision part with micropores or slits on a wet spinning machine that extrudes the fiber-forming solution; it is the main component for fiber formation. It is mainly divided into two categories: (1) Round spinneret, shaped like a top hat; (2) Plate spinneret, shaped like a plate arc. It can withstand greater working pressure and accommodate more pores. It is made of corrosion-resistant precious metals or non-metallic materials, commonly including gold-platinum alloys and ICr. 18 Materials include Ni9MO2Ti, platinum-iridium alloy, nickel, titanium, niobium, and tantalum. Spinneret orifices are mostly conical or arc-shaped to reduce frictional resistance in the spinning solution flow. Conical orifices consist of a cone and a cylinder; arc-shaped orifices consist of an arc and a cylinder. Large-diameter, multi-orifice spinnerets often divide the orifice into several sections, with ribs supporting each section to increase strength.

[0035] Potential difference: The difference in potential between different parts of a charged body or conductor in a circuit.

[0036] Spinability refers to the ability of a fluid to deform under stable tensile stress, that is, the ability of a fluid to form a long, thin filament under tension. In chemical fiber spinning, it is the maximum irreversible deformation capacity that a polymer fluid can withstand under uniaxial tension after being extruded from a spinneret. It is measured by the amount of deformation; or, in textile fiber processing, it is the ease with which fibers are made into yarn.

[0037] Beryllium bronze is a type of tin bronze with beryllium as its main alloying element. It contains 1.7–2.5% beryllium and small amounts of nickel, chromium, titanium, and other elements. After quenching and aging treatment, its ultimate tensile strength can reach 1250–1500 MPa, approaching the level of medium-strength steel. It has excellent plasticity in the quenched state and can be processed into various semi-finished products. Beryllium bronze possesses high hardness, elastic limit, fatigue limit, and wear resistance, as well as good corrosion resistance, thermal conductivity, and electrical conductivity.

[0038] Phosphor bronze: An alloy of copper, tin, and phosphorus, it is hard and can be used to make springs. It is a Cu alloy made by removing oxygen from pure copper and bronze (Cu-Sn) with phosphorus, leaving a small amount of phosphorus, and by adding 1% phosphorus to improve mechanical properties (toughness, elasticity, wear resistance, corrosion resistance). It is mainly used for wear-resistant parts and elastic elements. Applications include computer connectors, mobile phone connectors, high-tech industry connectors, springs for electronic and electrical applications, switches, slots, buttons, electrical connectors, lead frames, vibrating pads, and terminals in electronic products.

[0039] 2. The reference numerals in the accompanying drawings of the instruction manual include: 1. Spinneret 2. Conductive sheet 3. Spinneret cap 4. Gasket 5. C-type gasket 6. Composite filter screen 7. Horn mouth.

[0040] The implementation examples are basically as follows Figure 1-3As shown: A wet spinning forming method, the spinning solution enters the spinneret 1 and is then ejected from multiple small holes arranged on the surface of the spinneret 1, forming in a coagulation bath; the conductive sheet 2 between the side wall of the spinneret 1 and the spinneret cap 3 conducts the charge accumulated on the surface of the spinneret 1; the side of the spinneret 1 is provided with a gasket for sealing with a poor conductor; in this embodiment, a composite filter screen 6 is provided between the bell mouth 7 and the spinneret 1; the gasket includes a gasket 4 and C-shaped gaskets 5 at both ends of the composite filter screen 6; the gasket 4 is located between the two sides of the spinneret 1 and the spinneret cap 3.

[0041] Specifically, an elastic, wavy conductive sheet 2 is used to conduct the charge. The height of the crests and troughs of the wavy conductive sheet 2 is greater than the gap between the sidewall of the spinneret 1 and the spinneret cap 3, and the width of the conductive sheet 2 is less than the depth of the gap between the sidewall of the spinneret 1 and the spinneret cap 3. The conductive sheet 2 is made of copper with low resistivity and good conductivity.

[0042] Based on the above molding method, this embodiment also discloses a wet spinning preparation method, including a filtration step of filtering the spinning solution after diffusion and a molding step, wherein the molding step adopts the above molding method.

[0043] Based on the above-described forming method, this embodiment also discloses a forming apparatus for wet spinning, including a spinneret assembly, the spinneret assembly as follows: Figure 1 and Figure 3 As shown, the spinneret assembly includes a bell-shaped opening 7 connected to the spinning machine base, a spinneret cap 3 connected to the bell-shaped opening 7, and a spinneret head 1 connected to the spinneret cap 3. A conductive sheet 2 is provided between the spinneret cap 3 and the spinneret head 1. The forming device performs the spinning forming operation using the aforementioned forming method. The conductive sheet 2 is as follows... Figure 2 As shown, when installing the conductive sheet, it is embedded in the gap between the spinneret cap and the spinneret head, and the crests and troughs of the conductive sheet contact the spinneret cap and the spinneret head.

[0044] Note: In this invention, the spinneret replacement rate is used to characterize spinnability during the spinning process. Based on 100 spinnerets, a replacement rate of less than 6% within 10 days is considered excellent, 6%–10% is good, 10%–15% is relatively good, and greater than 15% is poor. Currently, the spinneret replacement rate in the device is generally 12–15%. The spinneret described in this invention has a diameter of 80 mm and a plate thickness of 12 mm.

[0045] The specific implementation process is as follows: The difficulty of this invention lies in selecting a suitable conductive sheet 2, the material, shape, and quantity of which have a significant impact on the final spinnability. This invention chooses to embed a wavy conductive copper sheet in the gap between the side wall of the spinneret 1 and the spinneret cap 3. Through the conductive connection of the spinneret 1, spinneret cap 3, bell mouth 7, spinning machine base, etc., the charge on the surface of the spinneret 1 is dissipated, reducing the deposits on the surface of the spinneret and improving spinnability.

[0046] Example 1

[0047] In this embodiment, beryllium bronze sheets are selected as the copper material. The copper sheets are approximately 40mm long, 8mm wide, and 0.1mm thick, with a peak and trough height of 2.2mm. Two wavy conductive copper sheets are embedded in each spinneret. During production, the spinneret's spinning speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate is observed during this period.

[0048] Comparative Example 1

[0049] Under the same spinning conditions, the spinneret's spin speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate during this period (without any conductive sheet inserted) is observed.

[0050] Example 2

[0051] In this embodiment, beryllium bronze is still selected as the copper sheet material. The copper sheet is approximately 35mm long, 8mm wide, and 0.1mm thick, with a peak and trough height of 2.5mm. Three wavy conductive copper sheets are embedded in each spinneret. During production, the spinneret's spinning speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate is observed during this period.

[0052] Comparative Example 2

[0053] Under the same spinning conditions, the spinneret's spin speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate during this period (without any conductive sheet inserted) is observed.

[0054] Example 3

[0055] In this embodiment, phosphor bronze is still selected as the copper sheet material. The copper sheet is approximately 40mm long, 8mm wide, and 0.1mm thick, with a peak and trough height of 2.2mm. Two corrugated conductive copper sheets are embedded in each spinneret. During production, the spinneret's spinning speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate is observed during this period.

[0056] Comparative Example 3

[0057] Under the same spinning conditions, the spinneret's spin speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate during this period (without any conductive sheet inserted) is observed.

[0058] Example 4

[0059] In this embodiment, phosphor bronze is still selected as the copper sheet material. The copper sheet is approximately 35mm long, 8mm wide, and 0.1mm thick, with a peak and trough height of 2.5mm. Three wavy conductive copper sheets are embedded in each spinneret. During production, the spinneret's spinning speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate is observed during this period.

[0060] Comparative Example 4

[0061] Under the same spinning conditions, the spinneret's spin speed is 10–18 m / min, the spinneret's negative draw ratio is 40–70%, and the first draw speed is 4.0–8.0 m / min. The continuous production cycle is 10 days, and the spinneret replacement rate during this period (without any conductive sheet inserted) is observed.

[0062] Table 1 shows the spinneret replacement rate for each embodiment and comparative example after 7 days of continuous production.

[0063] Table 1. Spinneret replacement rate after inserting conductive sheet

[0064]

[0065]

[0066] As shown in Table 1, under the same spinning conditions, the spinneret replacement rate after inserting copper sheets is much lower than that without inserting copper sheets, and both meet the good standard, especially Example 2, which meets the excellent standard.

[0067] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for forming a wet spinning yarn, wherein the spinning solution enters a spinneret and is then ejected from multiple small holes arranged on the surface of the spinneret, forming the yarn in a coagulation bath; characterized in that: The conductive sheet between the sidewall of the spinneret and the spinneret cap conducts the charge accumulated on the surface of the spinneret.

2. The wet spinning forming method according to claim 1, characterized in that: A wavy conductive sheet is used to conduct the charge.

3. The wet spinning forming method according to claim 2, characterized in that: The height of the crests and troughs of the wavy conductive sheet is greater than the gap between the spinneret sidewall and the spinneret cap.

4. The wet spinning forming method according to any one of claims 1-3, characterized in that: The width of the conductive sheet is less than the depth of the gap between the spinneret sidewall and the spinneret cap.

5. The wet spinning forming method according to claim 4, characterized in that: An elastic conductive sheet is used to conduct the charge.

6. The wet spinning forming method according to claim 5, characterized in that: A copper conductive sheet is used to conduct electrical charges.

7. The wet spinning forming method according to claim 6, characterized in that: Install gaskets to seal the sides of the spinneret.

8. The forming method of wet spinning according to claim 7, characterized in that: The washer is a poor conductor of electricity.

9. A method for preparing wet spinning, comprising a filtration step of filtering the spinning solution after diffusion and a forming step: Its features are: The molding step employs the molding method described in any one of claims 1-8.

10. A wet spinning forming apparatus, comprising a spinneret assembly, the spinneret assembly including a bell mouth connected to a spinning machine base, the bell mouth being connected to a spinneret cap, and the spinneret cap being connected to a spinneret head, characterized in that: A conductive sheet is provided between the spinneret cap and the spinneret head, and the conductive sheet is embedded in the gap between the spinneret cap and the spinneret head. The forming device performs the spinning forming operation using the forming method as described in any one of claims 1-8.

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