A collection device and collection method for wet-spun fibers

Abstract

The present invention relates to the field of wet spinning technology, and in particular to a collection device and collection method for wet-spun fibers, the collection device comprising a base, a first annular wall and a second annular wall; an annular groove is provided between the first annular wall and the second annular wall, a coagulation bath liquid is provided in the annular groove, and when the annular groove rotates, the outlet head of the wet-spun fiber is immersed below the liquid surface; during the wet spinning process, the rotation speed of the annular groove is adjusted to achieve continuous, controllable, gentle and large-scale fiber collection; compared with traditional drum collectors, the coagulation bath liquid in the present collection device can keep synchronous movement with the annular groove under the drive of the rotational motion of the annular groove, so that the present collection device provides a spinning collection environment without liquid resistance, and the wet-spun fibers do not need to be in force contact with any hard objects, thereby avoiding the influence of liquid resistance during the collection of the wet-spun fibers, and the adjustment range of the collection speed is wide, so the wet-spun fibers can be collected more easily and with higher quality.

Description

Technical Field

[0001] The present invention relates to the technical field of wet spinning, and in particular to a collecting device and a collecting method for wet-spun fibers. Background Art

[0002] Wet spinning is a process in which a polymer is dissolved in a suitable solvent and then used to prepare fibers through specialized spinning and collection devices. In wet spinning, the polymer is first added to the solvent to dissolve and form a polymer solution. The polymer solution is then extruded through a spinning device into a coagulation bath. Through rapid chemical reactions between the polymer and the coagulation bath, or through the coagulation bath extracting the solvent from the polymer solution, the extruded fibrous polymer solution solidifies to form fibers.

[0003] In wet spinning, the most commonly used collection device is a drum collector. A cylindrical drum or sheet collecting plate rotates continuously under the drive of a motor to collect the wet-spun fibers in a tangled manner. This method is controllable and stable, but it has many drawbacks: (1) The mechanical force of tangling and collecting causes fiber deformation: the drum collection device requires mechanical action between the drum and the fibers, and there is also a squeezing force between the collected fibers, which causes the fibers to be flattened and deformed, thereby reducing the fiber quality and continuous length; (2) The fluid resistance of the coagulation bath is high and unstable: in the commonly used wet spinning collection device, the coagulation bath is placed in a rectangular liquid tank. The coagulation bath is in a stationary state, while the fibers are in a moving state during collection, so fluid resistance is generated. As the fiber trajectory changes unstably, this fluid resistance will also change, affecting the morphological structure of the fiber; (3) High requirements for the mechanical properties of the fiber: the mechanical action between the drum collection device and the fiber requires the fiber itself to have a certain mechanical strength, otherwise problems such as unstable fiber diameter and breakage are likely to occur. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a collection device and collection method for wet-spun fibers, which solves the problems that the existing wet-spun fiber collection device is prone to pulling the fibers and the fluid resistance of the coagulation bath liquid has an adverse effect on the fibers.

[0005] To achieve the above-mentioned objectives, in a first aspect, the present invention provides a collection device for wet-spun fibers, comprising a base, a first ring wall and a second ring wall; the first ring wall is arranged on the base; the second ring wall is arranged on the base and is concentric with the first ring wall, the diameter of the second ring wall is larger than that of the first ring wall, and an annular groove is provided between the first ring wall and the second ring wall, the annular groove can rotate in a preset direction, and a coagulation bath liquid is provided in the annular groove.

[0006] In some embodiments, the collection device also includes a rotating device, which includes a rotating shaft and a driving unit. The rotating shaft is concentrically arranged with the annular groove. The rotating shaft can rotate along a preset direction under the drive of the driving unit to drive the annular groove to rotate along the preset direction.

[0007] In some embodiments, the radial width of the annular groove is more than 10 times the diameter of the wet-spun fiber.

[0008] In some embodiments, the coagulation bath liquid includes, but is not limited to, one of a calcium chloride aqueous solution, a dilute sulfuric acid solution, and a deionized water solution.

[0009] In a second aspect, the present invention further provides a method for collecting wet-spun fibers, which is applicable to the collecting device described in the first aspect, and the method comprises:

[0010] Immersing the spinning head of the wet spinning device in the coagulation bath liquid;

[0011] The rotation speed of the annular groove is adjusted so that the rotation speed of the annular groove is maintained within a preset speed range.

[0012] In some embodiments, the method further comprises:

[0013] The current density of the wet-spun fiber and the density of the coagulation bath liquid are obtained. When the density of the wet-spun fiber is less than the density of the coagulation bath liquid, the rotation speed of the annular groove is controlled to allow the wet-spun fiber to coil from the inside to the outside.

[0014] In some embodiments, the method further comprises:

[0015] When the density of the wet-spun fiber is greater than 1.1 times the density of the coagulation bath liquid, the depth of the annular groove is reduced to reduce the pulling effect of gravity on the wet-spun fiber.

[0016] In some embodiments, the rotational speed v d (Unit: laps / hour) is calculated using formula (1), which is as follows:

[0017]

[0018] Wherein, d (unit: cm) is the rotation diameter corresponding to one rotation of the outlet head of the wet spinning device placed in the annular groove, q0 (unit: ml / h) is the spinning solution flow rate corresponding to the current wet-spun fiber, and d0 (unit: cm) is the fiber diameter of the current wet-spun fiber.

[0019] In some embodiments, the preset speed includes a desired lower speed limit v d ′ and the ideal upper speed limit v d ″;

[0020] The ideal lower speed limit v d ' is calculated by formula (2), which is as follows:

[0021]

[0022] The ideal upper limit speed v d ″ is calculated by formula (3), which is as follows:

[0023]

[0024] Wherein, d1 is the diameter of the first annular wall, and d2 is the diameter of the second annular wall.

[0025] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0026] A coagulation bath liquid is provided in the annular groove. When the annular groove rotates, the outlet head of the wet-spun fiber is immersed below the liquid surface. During the wet spinning process, the rotation speed of the annular groove is adjusted to achieve continuous, controllable, gentle, and large-scale fiber collection. Compared with traditional commonly used roller collectors, the coagulation bath liquid in this collection device can maintain synchronous movement with the annular groove under the drive of the annular groove's rotation, so that the collection device provides a spinning collection environment without liquid resistance. The wet-spun fibers do not need to be in contact with any hard objects, avoiding the influence of liquid resistance during the collection of wet-spun fibers. In addition, the collection speed can be adjusted within a wide range, so it is easier to operate and collect wet-spun fibers with higher quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a first schematic diagram of a collecting device provided according to an embodiment of the present invention;

[0028] Figure 2 is a second schematic diagram of a collecting device provided according to an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the steps of the collection method provided according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. Base;

[0032] 2. First ring wall;

[0033] 3. Second annular wall;

[0034] 4. Annular groove;

[0035] 5. Coagulation bath liquid. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, identical modules are denoted by identical reference numerals. In the case of identical reference numerals, their names and functions are also identical. Therefore, their detailed description will not be repeated.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0038] See also Figure 1 and Figure 2 In the first aspect, the present embodiment provides a device for collecting wet-spun fibers, comprising a base 1, a first annular wall 2, and a second annular wall 3; the first annular wall 2 is arranged on the base 1; the second annular wall 3 is arranged on the base 1 and is concentric with the first annular wall 2, the diameter of the second annular wall 3 is larger than the first annular wall 2, and an annular groove 4 is provided between the first annular wall 2 and the second annular wall 3, the annular groove 4 can rotate in a preset direction, and a coagulation bath liquid 5 is provided in the annular groove 4.

[0039] The first ring wall 2 and the second ring wall 3 are both tubular structures. The heights of the first ring wall 2 and the second ring wall 3 can be the same, and the diameter of the first ring wall 2 is smaller than the diameter of the second ring wall 3. The two are coaxially arranged on the base 1. The shape of the base 1 is not limited in this embodiment and can be a disc or a ring. Figure 1 and Figure 2 The figure shows the positional relationship between the first annular wall 2, the second annular wall 3 and the base 1. It can be seen from the figure that there is an annular groove 4 between the first annular wall 2 and the second annular wall 3, and the bottom of the annular groove 4 is sealed by the base 1. The coagulation bath liquid 5 can be introduced into the annular groove 4 for collecting fibers.

[0040] The collecting device shown in this embodiment can be manufactured by the following methods:

[0041] Bonding method: prepare two cylindrical tubes of different diameters (i.e., the first annular wall 2 and the second annular wall 3); prepare a circular plate with a diameter equal to the outer diameter of the thicker cylindrical tube, or a ring-shaped plate with an outer diameter equal to the outer diameter of the thicker cylindrical tube and an inner diameter equal to the inner diameter of the thinner cylindrical tube (i.e., the base 1); the cylindrical tube and the circular or ring-shaped plate can be made of any material that can prevent liquid leakage, such as metal or plastic; place the two cylindrical tubes coaxially, and bond the circular plate or ring-shaped plate to the bottom surface of the cylindrical tube. The cylindrical tube and circular plate made of metal can be welded to form a whole, while the cylindrical tube and circular plate made of non-metallic material can be glued to form a whole. Through the above bonding method, a collection device with an annular groove 4 structure can be obtained.

[0042] Milling method: Design the dimensions of the collection device; select a block material with a height greater than the height of the annular groove 4 and a length and width greater than the outer diameter of the annular groove 4. Depending on the collection device's operating environment and load-bearing capacity, the block material can be any material that prevents liquid leakage, such as metal or plastic. Use a milling machine to machine an annular groove 4 of the desired depth into the block material. Using this milling method, a collection device with an annular groove 4 structure can be obtained.

[0043] 3D printing method: Design the structure and size model of the collection device; select the appropriate 3D printing material, which can be any material such as metal or plastic that can prevent liquid leakage; through the 3D printing method, a collection device with an annular groove 4 structure can be obtained.

[0044] It should be noted that the materials of the first annular wall 2, the second annular wall 3, and the base 1 should possess certain corrosion and wear resistance to ensure durability. Furthermore, the inner diameter of the first annular wall 2 is preferably greater than 5 cm, so that it forms an annular groove 4 with a relatively low curvature together with the second annular wall 3. Preferably, larger diameters of the first and second annular walls 2 and 3 can reduce the curvature of the inner wall of the annular groove 4, thereby providing a smoother annular liquid environment during rotation.

[0045] The inner wall surface of the annular groove 4 should be smooth and flat to avoid the fibers being blocked or entangled on the inner wall surface of the annular groove 4. The smooth and flat inner wall surface of the annular groove 4 is conducive to the collection device to use stable laminar shear force to make the coagulation bath liquid 5 in the annular groove 4 move synchronously with it, thereby providing a stable annular rotating liquid environment.

[0046] The collection device shown in this embodiment needs to be used in conjunction with a device having a rotating function. This embodiment does not impose any restrictions on the rotating device. It is worth noting that the load-bearing capacity of the rotating device used should be greater than the weight of the collection device to prevent the rotating device from being overloaded and unable to rotate. For example, the rotating device can be a turntable, and the collection device is placed on the turntable, keeping the annular groove 4 coaxial with the axis of the turntable to achieve rotation of the annular groove 4. For another example, the rotating device can be a rotating shaft, and the collection device can be mounted on the rotating shaft, so that the diameter of the first annular wall 2 is compatible with the rotating shaft.

[0047] The liquid level of the coagulation bath liquid 5 carried in the collecting device is slightly lower than the upper edge of the annular groove 4. After the rotating device is turned on, it can drive the collecting device to rotate, so that the coagulation bath liquid 5 in the annular groove 4 and the collecting device gradually move synchronously, realizing a stable, continuous and infinite length fluid environment in the annular groove 4.

[0048] In this embodiment, the coagulation bath liquid 5 is a liquid used to solidify the fibers during the fiber formation process. It is typically composed of a mixture of chemicals and solvents. In addition to varying chemical compositions, the coagulation bath liquid 5 commonly includes polymers, organic solvents, and complexing agents. These chemicals are mixed under specific temperature, pressure, and concentration to induce chemical reactions and further promote fiber formation. Ultimately, the fibers are processed in the coagulation bath liquid 5 to form the desired artificial fiber product.

[0049] When in use, the rotation of the collecting device causes the coagulation bath liquid 5 in the annular groove 4 to rotate as well. At this time, the spinning head of the wet spinning device (hereinafter referred to as wet spinning or wet spinning) is immersed in the coagulation bath liquid 5. The fiber polymer liquid in the spinning head enters the coagulation bath liquid 5 and instantly forms fibers. Due to the rotation of the annular groove 4, the fibers are naturally entangled in the coagulation bath liquid 5 without pulling each other, thereby realizing the collection of fibers.

[0050] It is worth noting that in this process, the height of the outlet head in the coagulation bath liquid 5 is preferably placed slightly below the liquid surface of the coagulation bath liquid 5. Since the fiber will generate gravity during the formation process, it will settle slightly in the coagulation bath liquid 5. This method can leave more collection space for the fibers to be collected in the annular groove 4, thereby increasing the fiber collection amount of a single fiber collection.

[0051] A coagulation bath liquid 5 is provided in the annular groove 4. When the annular groove 4 rotates, the outlet head of the wet-spun fiber is immersed below the liquid surface. During the wet spinning process, the rotation speed of the annular groove 4 is adjusted to achieve continuous, controllable, gentle and large-scale fiber collection. Compared with the traditional commonly used roller collector, the coagulation bath liquid 5 in this collection device can keep synchronous movement with the annular groove 4 under the drive of the rotation of the annular groove 4, so that the collection device provides a spinning collection environment without liquid resistance. The wet-spun fibers do not need to be in contact with any hard objects, avoiding the influence of liquid resistance during the collection of wet-spun fibers. In addition, the adjustment range of the collection speed is wide, so the wet-spun fibers can be collected more easily and with higher quality.

[0052] In some embodiments, the collection device also includes a rotating device, which includes a rotating shaft and a driving unit. The rotating shaft is concentrically arranged with the annular groove 4. The rotating shaft can rotate along a preset direction under the drive of the driving unit to drive the annular groove 4 to rotate along the preset direction.

[0053] The rotating shaft and the driving unit can be a whole, such as a commercially available turntable, a plane bearing, a rotary cylinder, etc.; or the rotating shaft and the driving unit can be separately equipped: an annular plate, a circular plate or a rotating shaft is used, and it is set at the output end of a driving device such as a rotary cylinder, a rotary electric cylinder, or a motor, and then the collecting device is placed on the rotating shaft to drive the collecting device to rotate in a preset direction. Driving the annular groove 4 to rotate in a preset direction can be understood as follows: the annular groove 4 is set on the collecting device, and the rotating device drives the collecting device to rotate, which can drive the annular groove 4 to rotate; the preset direction is a pre-set direction, that is, the rotation direction of the annular groove 4, for example, it can be clockwise or counterclockwise. It is worth noting that during a single fiber collection process, the rotation direction of the annular groove 4 is consistent.

[0054] In some embodiments, the radial width of the annular groove 4 is at least 10 times the diameter of the wet-spun fiber. In this embodiment, the annular groove 4's width is greater than the wet-spun fiber's diameter to allow the wet-spun fiber to enter and be collected in the annular groove 4. Preferably, the annular groove 4's width can be at least 10 times the wet-spun fiber's diameter, increasing the annular groove 4's fiber storage capacity and providing greater flexibility in controlling the rotating platform's speed.

[0055] In some embodiments, the coagulation bath liquid 5 includes, but is not limited to, one of a calcium chloride aqueous solution, a dilute sulfuric acid solution, and a deionized water solution. The specific type of coagulation bath liquid 5 described in this embodiment depends on the fibers being collected. For example, when the fibers are wet-spun alginate hydrogel fibers, the coagulation bath liquid 5 is a calcium chloride aqueous solution; when the fibers are wet-spun cellulose fibers, the coagulation bath liquid 5 is a dilute sulfuric acid solution. The polymers and coagulation baths available for wet-spun fibers are extremely diverse, and the collection device and method provided in this embodiment are generally applicable to any coagulation bath liquid.

[0056] See also Figure 3 In a second aspect, this embodiment further provides a method for collecting wet-spun fibers, which is applicable to the collecting device described in the first aspect, and the method comprises:

[0057] S11, immersing the spinning head of the wet spinning device in the coagulation bath liquid 5;

[0058] S12. Adjust the rotation speed of the annular groove so that the rotation speed of the annular groove remains within a preset speed range.

[0059] During use, the rotation of the collecting device causes the coagulation bath liquid 5 in the annular groove to rotate as well. At this time, the spinning head of the wet spinning device (hereinafter referred to as wet spinning or wet spinning) is immersed in the coagulation bath liquid 5. The fiber polymer liquid in the spinning head enters the coagulation bath liquid 5 and instantly forms fibers. Due to the rotation of the annular groove, the fibers are naturally entangled in the coagulation bath liquid 5 without pulling each other, thereby realizing the collection of fibers.

[0060] It is worth noting that during this process, the rotation speed of the annular groove will affect the shape of the coagulation bath liquid 5: when the annular groove rotates too fast, the fibers will coil around the first annular wall 2, be subjected to pulling force, and squeeze each other, affecting the fiber morphology; when the annular groove rotates too slowly, the fibers will come into contact with the second annular wall 3, resulting in a bent shape.

[0061] Therefore, it is necessary to adjust the rotation speed of the annular groove to keep it within a preset speed range. Within this range, the coagulation bath liquid 5 in the annular groove remains relatively static with the annular groove, does not generate fluid resistance to the fiber, and can maintain a certain collection speed, which is convenient for fiber collection.

[0062] In some embodiments, the method further includes: obtaining the current density of the wet-spun fiber and the density of the coagulation bath liquid 5; when the density of the wet-spun fiber is less than the density of the coagulation bath liquid 5, controlling the rotation speed of the annular groove so that the wet-spun fiber is coiled from the inside to the outside.

[0063] In some embodiments, the method further comprises:

[0064] When the density of the wet-spun fiber is greater than 1.1 times the density of the coagulation bath liquid 5, the depth of the annular groove is reduced to reduce the pulling effect of gravity on the wet-spun fiber.

[0065] Specifically, when the density of the wet-spun fiber is less than the density of the coagulation bath liquid 5, the wet-spun fiber will float upward to the surface of the coagulation bath liquid 5 after extrusion. The rotation speed needs to be precisely controlled so that the wet-spun fiber can be coiled from the inside to the outside when it floats to the surface of the coagulation bath liquid 5; when the density of the wet-spun fiber is equal to or slightly less than the density of the coagulation bath liquid 5, no special requirements are required, and the wet-spun fiber can be smoothly collected into the annular groove; when the density of the wet-spun fiber is greater than 1.1 times the density of the coagulation bath liquid 5, the depth of the annular groove needs to be reduced to less than 5 cm to reduce the pulling effect of gravity on the wet-spun fiber.

[0066] In some embodiments, the rotational speed v d (Unit: laps / hour) is calculated using formula (1), which is as follows:

[0067]

[0068] Wherein, d (unit: cm) is the rotation diameter corresponding to one rotation of the outlet head of the wet spinning device placed in the annular groove, q0 (unit: ml / h) is the spinning solution flow rate corresponding to the current wet-spun fiber, and d0 (unit: cm) is the fiber diameter of the current wet-spun fiber.

[0069] In this embodiment, the rotation diameter corresponding to the spinning head of the wet spinning device being placed in the annular groove and rotating one circle means: when the annular groove rotates, the fibers in the spinning head of the wet spinning device are output in the annular groove, and when the annular groove rotates one circle relative to the spinning head, the formed fibers are wound around in the annular groove for one circle, and the corresponding diameter is d; the spinning speed refers to the speed at which the fibers are formed.

[0070] In some embodiments, the preset speed includes a desired lower speed limit v d ′ and the ideal upper speed limit v d ″;

[0071] The ideal lower speed limit v d ' is calculated by formula (2), which is as follows:

[0072]

[0073] The ideal upper limit speed v d ″ is calculated by formula (3), which is as follows:

[0074]

[0075] Wherein, d1 is the diameter of the first annular wall 2 , and d2 is the diameter of the second annular wall 3 .

[0076] The ideal upper limit speed and the ideal lower limit speed shown in this embodiment are relative to the annular groove 4. Within the ideal upper and lower limit speed ranges, the fibers will not touch the groove walls on both sides of the annular groove 4, avoiding the annular groove 4 from bending or squeezing the fibers, and can remain in a relatively static state with the coagulation bath liquid 5, thereby achieving water flow resistance-free, gentle, continuous, large-scale and controllable wet-spun fiber collection.

[0077] The following provides four examples of collecting wet-spun fibers to further understand the above-mentioned collecting device and collection method:

[0078] First embodiment:

[0079] Step 1: Bond two acrylic tubes with inner diameters of 30 cm and 20 cm, a height of 10 cm, and a thickness of 3 mm to a circular acrylic base plate with a diameter of 30 cm and a thickness of 3 mm, keeping the centers of the two acrylic tubes and the base plate coaxial to form a collection device.

[0080] Step 2: Place the collection device on a horizontal electric speed-adjustable turntable with a diameter of 30 cm, so that the collection device and the axis of the electric speed-adjustable turntable are coaxial;

[0081] Step 3: Pour calcium chloride aqueous solution as a coagulation bath into the collection device, with the liquid level 3 cm below the collection device, and immerse a flat-head needle with an inner diameter of 0.8 mm (i.e., the wire-extracting tip) in the calcium chloride solution;

[0082] Step 4: Extrude the sodium alginate aqueous solution through the needle (i.e., the filament outlet) at a rate of 30 mL / h, and adjust the turntable speed to 1.5 turns / min to achieve stable and continuous collection of alginate hydrogel wet-spun fibers.

[0083] Second embodiment:

[0084] Step 1: Weld two stainless steel circular tubes with inner diameters of 2.5m and 3m, height of 0.5m, and thickness of 10mm to a circular stainless steel base plate with an outer diameter of 3.01m, an inner diameter of 2.5m, and thickness of 10mm, keeping the two stainless steel circular tubes coaxial with the center of the circular base plate to obtain a collection device with a 2.5m diameter center hole;

[0085] Step 2: Place the collection device onto a vertically placed rotating shaft with a 2.5 m outer diameter circular tube, so that the collection device is coaxial with the axis of the rotating shaft;

[0086] Step 3: Pour the dilute sulfuric acid solution as a coagulation bath into the collection device, with the liquid level 10 cm below the collection device, and immerse the spinning head (i.e., the spinning head) with an inner diameter of 1 mm in the dilute sulfuric acid solution;

[0087] Step 4: The cellulose copper ammonia solution was squeezed out through a needle (ie, a spinning head) at a rate of 500 mL / h, and the turntable speed was adjusted to 1.2 revolutions / min to achieve stable and continuous collection of cellulose wet-spun fibers.

[0088] Third embodiment:

[0089] Step 1: Prepare a nylon cylinder with a diameter of 51 cm and a height of 6 cm. Use a CNC milling machine to machine an annular groove 4 with an inner diameter of 50 cm and an outer diameter of 35 cm, respectively, and a depth of 5 cm to prepare a collection device.

[0090] Step 2: Place the collection device on a horizontal electric speed-adjustable turntable with a diameter of 50 cm, so that the collection device and the axis of the electric speed-adjustable turntable are coaxial;

[0091] Step 3: Pour deionized water solution as a coagulation bath into the collection device, with the liquid level 1 cm below the collection device, and immerse a flat-head needle with an inner diameter of 2 mm (i.e., the wire outlet) in the deionized water solution;

[0092] Step 4: Extrude the N,N-dimethylformamide solution of polyacrylonitrile through the needle (i.e., the outlet head) at a rate of 2000 mL / h, and adjust the turntable speed to 8 turns / min to achieve stable and continuous collection of polyacrylonitrile wet-spun fibers.

[0093] Fourth embodiment:

[0094] Step 1: Create a 3D model of a collection device with dimensions of 20 cm inner wall outer diameter, 30 cm outer wall inner diameter, 8 cm inner height, 2 mm thickness of inner and outer walls and bottom plate, and a 19.8 cm through-hole in the middle. Use a 3D printer to obtain a collection device made of plastic.

[0095] Step 2: Place the collection device onto a vertically placed rotating shaft with an outer diameter of 19.8 cm, so that the collection device is coaxial with the axis of the rotating shaft;

[0096] Step 3: Pour the deionized water solution as a coagulation bath into the collection device, with the liquid level 0.5 cm below the collection device, and immerse the spinning head (i.e., the spinning head) with an inner diameter of 1 mm in the deionized water solution;

[0097] Step 4: Extrude the polyurethane N,N-dimethylformamide solution through the needle (i.e., the outlet head) at a rate of 60 mL / h, and adjust the turntable speed to 1.62 turns / min to achieve stable and continuous collection of polyurethane wet-spun fibers.

[0098] The above embodiment can avoid the effects of liquid resistance during wet-spun fiber collection. Driven by the rotation of the collection device, the coagulation bath liquid 5 can maintain synchronous movement with the annular groove 4 of the collection device. When the wet-spun fiber's output speed matches the rotation speed of the turntable, the wet-spun fiber can move synchronously with the coagulation bath liquid 5 in the horizontal direction, with almost no resistance from the surrounding liquid, and the collection process is stable and gentle. Therefore, compared with the drum collector, the impact of water flow resistance on fiber quality is greatly reduced, while also eliminating the mechanical strength requirements of the wet-spun fiber during the collection process.

[0099] The space between the two side walls of the annular groove 4 of the collection device allows for relatively tolerant adjustment of the turntable speed: at excessively high speeds, the fibers will entangle with the first annular wall 2 of the annular groove 4; at excessively low speeds, the fiber extrusion speed exceeds the annular displacement speed of the coagulation bath liquid 5, resulting in a certain degree of bending. Between these two ranges, a relatively wide rotational speed range exists, allowing the fibers to be smoothly collected in the annular coagulation bath liquid 5. Therefore, compared to traditional drum collectors, not only is the collection speed more tolerant to adjustment, but compression between the fibers and the collection device, or between the fibers, or tension on the fibers from the collector is avoided, thereby ensuring higher-quality fiber collection.

[0100] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved. This is not limited herein.

[0101] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A device for collecting wet-spun fibers, characterized in that: include: base; a first annular wall, disposed on the base; a second annular wall, disposed on the base and concentrically disposed with the first annular wall, the second annular wall having a larger diameter than the first annular wall, an annular groove being defined between the first annular wall and the second annular wall, the annular groove being rotatable in a preset direction, and a coagulation bath liquid being disposed in the annular groove; A rotating device, comprising a rotating shaft and a driving unit, wherein the rotating shaft is concentrically arranged with the annular groove, and the rotating shaft can rotate in a preset direction under the drive of the driving unit to drive the annular groove to rotate in the preset direction; After the rotating device is turned on, the collecting device rotates so that the coagulation bath liquid in the annular groove also rotates, and the spinning head is immersed in the coagulation bath liquid. The fiber polymer liquid in the spinning head enters the coagulation bath liquid to form fibers, and the fibers are naturally entangled in the coagulation bath liquid. Rotation speed of the annular groove (Unit: laps / hour) is calculated using formula (1), which is as follows: ； in, (Unit: cm) is the rotation diameter corresponding to one rotation of the wire head in the annular groove. (Unit: ml / h) is the spinning solution flow rate corresponding to the current wet spinning fiber, (Unit: cm) is the fiber diameter of the current wet-spun fiber.

2. The collecting device for wet-spun fibers according to claim 1, characterized in that: The radial width of the annular groove is more than 10 times the diameter of the wet-spun fiber.

3. The collecting device for wet-spun fibers according to claim 1, characterized in that: The coagulation bath liquid includes but is not limited to one of a calcium chloride aqueous solution, a dilute sulfuric acid solution and a deionized water solution.

4. A method for collecting wet-spun fibers, characterized in that: Applicable to the collection device according to any one of claims 1 to 3, the method comprising: immersing the spinning head of the wet spinning device in the coagulation bath liquid; The rotation speed of the annular groove is adjusted so that the rotation speed of the annular groove is maintained within a preset speed range.

5. The method for collecting wet-spun fibers according to claim 4, wherein: The method further comprises: The current density of the wet-spun fiber and the density of the coagulation bath liquid are obtained. When the density of the wet-spun fiber is less than the density of the coagulation bath liquid, the rotation speed of the annular groove is controlled to allow the wet-spun fiber to coil from the inside to the outside.

6. The method for collecting wet-spun fibers according to claim 5, wherein: The method further comprises: When the density of the wet-spun fiber is greater than 1.1 times the density of the coagulation bath liquid, the depth of the annular groove is reduced to reduce the pulling effect of the gravity of the wet-spun fiber on the wet-spun fiber.

7. The method for collecting wet-spun fibers according to claim 4, wherein: The preset speed includes an ideal lower speed limit And the ideal upper speed limit ; The ideal lower speed limit It is calculated by formula (2), which is as follows: ； The ideal upper limit speed It is calculated by formula (3), which is as follows: ； in, is the diameter of the first ring wall, is the diameter of the second annular wall.

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