A spinning duct for rapidly solidifying gel fibers

Abstract

The application provides a spinning nozzle for rapidly solidifying gel fibers, comprising: a spinneret arranged at the center of the top of the spinning nozzle; and a nozzle body arranged below the spinneret, wherein the nozzle body comprises a plurality of coaxially arranged cylindrical nozzle segments, each nozzle segment comprising a plurality of air inlets arranged in a ring shape on the inner wall of the upper part of each nozzle segment, through which hot air is supplied into the nozzle segment; and a plurality of air outlets arranged in a ring shape on the inner wall of the lower part of each nozzle segment, through which the hot air in the nozzle segment is discharged. The application can accelerate the drying and solidification of gel fibers, reduce the occurrence of dripping, avoid problems such as adhesion and breakage of fiber tows, improve the spinning speed and the quality stability of the fibers, and improve the production efficiency.

Description

Technical Field

[0001] The embodiments of this disclosure generally relate to the field of dry spinning, and more specifically, to a spinning tunnel for rapidly curing gel fibers. Background Technology

[0002] In traditional dry spinning, the spinning solution is forced out from the capillary pores of the spinneret and enters the spinning tunnel. The hot airflow within the tunnel causes the solvent in the solution stream to evaporate rapidly. The evaporated solvent vapor is carried away by the hot airflow, and the solution gradually solidifies as it loses solvent. Under the influence of winding tension, the solution elongates and thins to form nascent fibers. Therefore, solvent evaporation, tunnel temperature and humidity, etc., are important factors affecting the state and quality of the nascent fibers.

[0003] In production practice, the fiber curing speed caused by solvent evaporation is relatively slow, and the uncured yarn is prone to sticking together. If the fiber curing efficiency is improved by rapidly increasing the tunnel temperature, problems such as surface skin cracks and easy breakage of the yarn are likely to occur, which directly affect the performance of the spun yarn, thereby affecting production costs and reducing production efficiency. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a spinning channel for rapidly curing gel fibers. While accelerating the drying and curing of gel fibers, it reduces dripping, avoids problems such as fiber bundle adhesion and breakage, improves spinning speed and fiber quality stability, and increases production efficiency.

[0005] This invention provides a spinning duct for rapidly curing gel fibers, comprising: a spinneret disposed at the center of the top of the spinning duct; and a duct body disposed below the spinneret, wherein the duct body comprises a plurality of coaxially arranged cylindrical duct segments, each duct segment comprising a plurality of annularly arranged air inlets disposed on the upper inner wall of each duct segment, through which hot air is supplied into the duct segment; and a plurality of annularly arranged return air inlets disposed on the lower inner wall of each duct segment, through which the hot air is discharged from the duct segment.

[0006] Furthermore, the sum of the flow rates supplied to each passageway section by each air inlet is approximately equal to the sum of the flow rates discharged from each passageway section through each air return outlet.

[0007] Furthermore, the airflow rate at the air inlet of the upper passageway section is greater than that at the air inlet of the lower passageway section; the airflow rate at the return air outlet of the upper passageway section is less than that at the return air outlet of the lower passageway section.

[0008] Furthermore, when the various tunnel sections are connected to form a tunnel body, a heating sleeve is covered on the outer wall of the tunnel body, which heats the temperature inside the tunnel body to 30-120℃ during operation.

[0009] Furthermore, the flow rate of the spinning solution within the channel is 300-500 m / min.

[0010] Furthermore, the total length of the tunnel is 5-8m.

[0011] Furthermore, each passageway section comprises three segments: an upper passageway, a middle passageway, and a lower passageway. Specifically, the air inlet velocity at the air inlet of the upper passageway is 0.3-1.0 m / s, and the return air velocity is 0.3-0.5 m / s; the air inlet velocity at the air inlet of the middle passageway is 0.3-0.7 m / s, and the return air velocity is 0.3-0.7 m / s; and the air inlet velocity at the air inlet of the lower passageway is 0.3-0.5 m / s, and the return air velocity is 0.3-1.0 m / s.

[0012] Furthermore, the gas supplied to the passageway section by the air inlet is a mixture of organic gas and carrier gas, with an organic gas concentration of 22-28%.

[0013] Furthermore, the organic gas is ammonia, which enters each passageway section through the air inlet and enters the waste gas treatment system through the return air inlet.

[0014] Furthermore, the spinning channel may also include a temperature sensor, which is installed on the inner wall in the middle of each channel section.

[0015] It should be understood that the description in the Summary of the Invention section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0016] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0017] Figure 1 A front sectional view of a spinning duct provided in an embodiment of the present invention is shown;

[0018] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0019] 1. Spinneret; 2. Duct body, 200A, 200B, 200C duct sections, 210A, 210B, 210C, 510A, 510B, 510C air inlets, 220A, 220B, 220C, 520A, 520B, 520C return air outlets; 3. Temperature sensor; 4. Heating sleeving; 5. Waste gas recovery device, 500A, 500B, 500C recovery section; 6. Spinneret outlet. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] The following reference Figure 1 This invention describes a spinning channel for rapidly curing gel fibers, provided by an embodiment of the present invention.

[0023] Specifically, the spinning duct for rapid curing of gel fibers in this embodiment includes a spinneret 1 disposed at the center of the top of the spinning duct; and a duct body 2 disposed below the spinneret. The duct body 2 includes multiple coaxially arranged cylindrical duct sections 200A, 200B, and 200C. Each duct section includes multiple annularly arranged air inlets disposed on the upper inner wall of each duct section 200A, 200B, and 200C. 210A, 210B, and 210C supply hot gas to each passageway section 200A, 200B, and 200C through air inlets 210A, 210B, and 210C respectively; and multiple return air inlets 220A, 220B, and 220C arranged in a ring on the lower inner wall of each passageway section 200A, 200B, and 200C discharge hot gas from the passageway section through return air inlets 220A, 220B, and 220C.

[0024] In this embodiment, hot gas is supplied to each passageway section 200A, 200B, 200C through air inlets 210A, 210B, 210C, and the hot gas is extracted through air outlets 220A, 220B, 220C, thus forming an air passage that runs through the entire cavity of the passageway body 2.

[0025] When the spinning tunnel of the present invention is in operation, the spinning solution is ejected as a spinning fine stream through the spinneret 1. The spinneret 1 is preferably a circular spinneret, and the ejected fine stream has a circular cross-section. The spinning fine stream enters the tunnel section 200A and comes into full contact with the hot gas. Under the action of the air path formed in the inner cavity of the tunnel body 2, the spinning fine stream descends together with the hot gas supplied to the tunnel sections 200A, 200B, and 200C by the air inlets 210A, 210B, and 210C, respectively. Under the action of the hot air flow, the solvent in the spinning fine stream evaporates, the polymer concentration in the filament increases, and the filament solidifies to form nascent fiber.

[0026] As the spinning filaments fall step by step along each channel section 200A, 200B, and 200C and form nascent fibers, they are rapidly dried and solidified by the hot gas blown in each channel section 200A, 200B, and 200C.

[0027] In this embodiment, the sum of the flow rates supplied by each air inlet 210A, 210B, and 210C to each tunnel section 200A, 200B, and 200C is approximately equal to the sum of the flow rates discharged from each tunnel section 200A, 200B, and 200C through each air return outlet 220A, 220B, and 220C. On the one hand, this ensures a constant gas flow rate within the tunnel body 2, thereby further maintaining a stable gas velocity and improving product quality; on the other hand, it eliminates the need for a gas replenishment device, controlling costs.

[0028] In this embodiment, the flow rate of the air inlet 210A of the passageway section 200A is greater than the flow rate of the air inlet 210B of the passageway section 200B, and the flow rate of the air inlet 210B of the passageway section 200B is greater than the flow rate of the air inlet 210C of the passageway section 200C; the flow rate of the return air inlet 220A of the passageway section 200A is less than the flow rate of the return air inlet 220B of the passageway section 200B, and the flow rate of the return air inlet 220B of the passageway section 200B is less than the flow rate of the return air inlet 220C of the passageway section 200C. This configuration causes the airflow at the air inlets 210A, 210B, and 210C on each of the tunnel sections 200A, 200B, and 200C within the tunnel body 2 to decrease sequentially from the upper tunnel section to the lower tunnel section, while the airflow at the return air inlets 220A, 220B, and 220C increases sequentially from the upper tunnel section to the lower tunnel section, thereby forming a naturally downward hot airflow.

[0029] The hot gas entering the channel section 200A through the air inlet 210A comes into contact with the spinning fine stream within the channel section 200A, acting uniformly on the spinning fine stream and flowing downwards with it. The solvent evaporates under the action of the hot gas. Upon passing through the return air inlet 220A, a mixture of evaporated solvent and hot gas is partially discharged through the return air inlet 25A. Since the flow rate of the mixed gas discharged at the return air inlet 220A is less than the flow rate supplied at the air inlet 210A, the remaining mixed gas, under the influence of the gas pressure difference within the channel section 200A, pushes the fiber bundle further downwards into the channel section 200B. At this time, the air inlet 210B continues to supply hot gas into the channel section 200B, and the fiber bundle continues to dry and solidify. The fiber bundle continues downward under the push of the hot air flow. When it passes through the return air inlet 220B, part of the mixed gas in the tunnel section 200B is discharged. At this time, the flow rate of the mixed gas discharged at the return air inlet 220B is still less than the flow rate supplied to the tunnel section 200B. Therefore, the remaining mixed gas pushes the fiber bundle downward under the action of the gas pressure difference in the tunnel section 200B and enters the tunnel section 200C. At this time, the air inlet 210C continues to supply hot gas to the tunnel section 200C. The solvent in the fiber bundle continues to evaporate. When the hot air flow pushes the fiber bundle down to the return air inlet 220C, all the solvent evaporates, the fiber drying and curing is completed, and the return air inlet 220C discharges the mixed gas to the exhaust gas treatment system.

[0030] In this embodiment, with the tunnel sections 200A, 200B, and 200C connected to form the tunnel body 2, a heating sleeve 4 covers the outer wall of the tunnel body 2. In the working state, the heating sleeve 4 can heat the temperature inside the tunnel body 2 to 30-120°C, so that the temperature and humidity inside the tunnel body 2 can be kept constant when the device is in operation, allowing the solvent to evaporate effectively and be promptly expelled by the airflow, thereby improving the quality of the fiber.

[0031] In this embodiment, the gas supplied to each tunnel section 200A, 200B, and 200C through each air inlet 210A, 210B, and 210C is a mixture of organic gas and carrier gas, with an organic gas concentration of 22-28%. The carrier gas can be one or more inert gases such as air, nitrogen, and helium, and the preferred organic gas is ammonia. Ammonia, acting as a condensation bath, is supplied as steam through each air inlet 210A, 210B, and 210C into the tunnel body 2, accelerating the solidification of the gel fibers, reducing dripping, and preventing problems such as fiber adhesion and breakage. The ammonia then enters the waste gas treatment system through the return air inlets 220A, 220B, and 220C, improving spinning speed and yarn quality stability, and increasing production efficiency.

[0032] In this embodiment, the viscosity of the spinning solution used is 100-400 Pa*s, the spinning speed is 300-500 m / min, the number of spinneret orifices is 30-150, and the orifice diameter is 0.06-0.12 mm.

[0033] In this embodiment, the diameter of tunnel section 200A is 0.2-0.5m, the length is 0.8-1.5m, the temperature is controlled at 50-100℃, the air inlet velocity at air inlet 210A is 0.3-1.0m / s, and the return air velocity at air outlet 220A is 0.3-0.5m / s; the diameter of tunnel section 200B is 0.2-0.5m, the length is 1.5-3m, the temperature is controlled at 80-150℃, and the air inlet velocity at air inlet 210B is 0.3-

[0034] The return air velocity at return air inlet 220B is 0.3-0.7 m / s; the diameter of the tunnel section 200C is 0.2-0.5 m, the length is 2-4 m, the temperature is controlled at 80-140℃, the intake air velocity at air inlet 210C is 0.3-0.5 m / s, and the return air velocity at return air inlet 220C is 0.3-1.0 m / s. The total length of tunnel body 2 is 5-8 m.

[0035] In this embodiment, each air inlet 210A, 210B, 210C and each air return outlet 220A, 220B, 220C uses air inlet and return ducts of the same diameter, and a flow meter is installed on each air inlet duct near each air inlet 210A, 210B, 210C. When the device is working, the return air velocity at each return air inlet 220A, 220B, and 220C is first controlled by the fans on each return air duct. The flow velocity at each return air inlet 220A, 220B, and 220C is obtained by using the formula: flow velocity at return air inlet = flow rate at return air inlet / cross-sectional area of ​​return air duct. Similarly, the flow velocity at the air inlet is calculated as: flow rate at air inlet / cross-sectional area of ​​air inlet duct. The flow rate supplied from each air inlet 210A, 210B, and 210C to each tunnel section 200A, 200B, and 200C is controlled by the flow meter on each air inlet duct. Thus, the flow velocity at each air inlet 210A, 210B, and 210C is controlled. Finally, a naturally downward airflow is formed within the tunnel body 2.

[0036] In some other embodiments, the number of passageway sections is not limited to three and can be adjusted according to actual needs.

[0037] In this embodiment, the hot air flow velocity inside the tunnel body 2 is 0.3–1.0 m / s. The gas flow rate at each air inlet 210A, 210B, and 210C decreases sequentially from top to bottom, while the gas flow rate at each air return outlet 220A,

[0038] The gas flow rate at 220B and 220C increases sequentially from top to bottom, thus naturally forming a stable downward-flowing hot airflow within the tunnel body 2. If the hot airflow velocity is below 0.3m / s, the organic gas will not have sufficient contact with the fiber bundles, the solvent will not evaporate sufficiently, and the fiber bundles will easily stick together, affecting product quality. If the hot airflow velocity is above 1.0m / s, the excessively fast hot airflow velocity will cause the fiber bundles in the tunnel body 2 to shake, causing the fiber bundles to break or stick together.

[0039] After the nascent fiber bundle extends from the lower end of the tunnel section 200C, it enters the waste gas recovery device 5 to remove the ammonia gas supplied to the tunnel body 2 by each air inlet 210A, 210B, and 210C, as well as the solvent volatilized during the process of forming nascent fibers by the spinning fine stream.

[0040] In this embodiment, the waste gas recovery device 5 includes multiple coaxially arranged recovery sections 500A, 500B, and 500C, which are trapezoidal in shape when projected from the front and circular in shape when projected from the horizontal plane, and a wire outlet 6 located at the center of the bottom of the waste gas recovery device 5. Each recovery section 500A, 500B, and 500C includes multiple annularly arranged air inlets 510A, 510B, and 510C disposed on the upper inner wall of each recovery section 500A, 500B, and 500C. B and 510C supply gas to each recovery section 500A, 500B, and 500C through air inlets 510A, 510B, and 510C; and multiple return air inlets 520A, 520B, and 520C arranged in a ring on the lower inner wall of each recovery section 500A, 500B, and 500C dilute and discharge the waste gas in each recovery section 500A, 500B, and 500C through return air inlets 520A, 520B, and 520C.

[0041] In this embodiment, the diameters of the recovery sections 500A, 500B, and 500C on the horizontal cross-section gradually decrease from top to bottom along the axial direction of each recovery section 500A, 500B, and 500C. This causes the average distance from the mixed gas inside the cavity of each recovery section 500A, 500B, and 500C to each return air inlet 520A, 520B, and 520C to gradually decrease. By compressing the space of each recovery section 500A, 500B, and 500C, the dispersed toxic gas molecules are aggregated together. Under the same amount of toxic gas, the concentration of toxic gas is increased, which facilitates rapid recovery of toxic gas and improves recovery efficiency.

[0042] In this embodiment, the sum of the flow rates supplied to the recovery sections 500A, 500B, and 500C by each air inlet 510A, 510B, and 510C is approximately equal to the sum of the flow rates discharged from the recovery sections 500A, 500B, and 500C through each return air outlet 520A, 520B, and 520C. This maintains a constant air pressure within the waste gas recovery device 5, allowing the nascent fibers to continue descending to the bottom of the recovery section 500C in a stable airflow after entering the recovery section 500A, and then extending from the fiber outlet 6 for further operations such as fiber guiding and winding.

[0043] In this embodiment, the gas supplied by each air inlet 510A, 510B, and 510C to each recovery section 500A, 500B, and 500C is one or more mixed gases selected from inert gases such as air, nitrogen, and helium. Its main function is to dilute the toxic gases in the waste gas recovery device 5 as a clean gas and to maintain a stable gas pressure within the waste gas recovery device 5.

[0044] In some other embodiments, the number of recycling segments is not limited to three and can be adjusted according to actual needs.

[0045] In some other embodiments, the spinning channel for rapidly curing gel fibers also includes a temperature sensor 3, which is disposed on the inner wall of the middle part of each channel section 200A, 200B, and 200C, for detecting the real-time temperature inside the channel body 2 so as to adjust the temperature at any time and maintain a constant temperature in each channel section 200A, 200B, and 200C.

[0046] According to the embodiments of this disclosure, the following technical effects are achieved:

[0047] By setting air inlets 210A, 210B, 210C and return air inlets 220A, 220B, 220C in each tunnel section 200A, 200B, 200C, and adjusting the gas flow rate at each air inlet 210A, 210B, 210C and each return air inlet 220A, 220B, 220C, a naturally downward hot airflow is formed within the tunnel body 2. This allows the gas to come into uniform and sufficient contact with the gel fibers within the tunnel body 2, thereby rapidly evaporating the solvent in the fibers. The gas then descends under the propulsion of the stable hot airflow, quickly drying and solidifying the fibers while improving spinning efficiency and quality. Supplying the coagulation bath to the tunnel body 2 in the form of steam further accelerates the solidification of the gel fibers. This reduces the occurrence of dripping. By setting multiple hot gas inlets 210A, 210B, 210C and hot gas return inlets 220A, 220B, 220C, different concentrations of organic gas can be introduced as needed to accelerate the curing of gel fibers. At the same time, this spinning tunnel is also suitable for the preparation of non-oxide fibers, and it improves the convenience of producing different types of fibers and reduces production costs. By forming a natural airflow path in the tunnel body 2 and cooperating with the heating circulation of the outer wall of the tunnel body 2, a large amount of solvent is effectively evaporated and promptly separated by the airflow, maintaining the temperature and humidity balance in the tunnel body 2. At the same time, the airflow acts evenly on the fiber bundle, reducing the mutual entanglement between the fiber bundles and improving production efficiency.

[0048] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A spin duct for rapidly solidifying gel fibers, characterized by, comprising, a spinneret arranged at the center of the top of the spinning duct; and a duct body arranged below the spinneret, wherein, the duct body comprises a plurality of cylindrical duct segments arranged coaxially, each of the duct segments comprises, a plurality of air inlets arranged annularly on the inner wall of the upper part of each of the duct segments, through which hot air is supplied into the duct segment; and a plurality of air outlets arranged annularly on the inner wall of the lower part of each of the duct segments, through which the hot air in the duct segment is discharged; the sum of the flow rates of the air supplied into each of the duct segments through the air inlets is substantially equal to the sum of the flow rates of the air discharged from each of the duct segments through the air outlets; the flow rate of the air inlets of the upper duct segment is greater than that of the air inlets of the lower duct segment; the flow rate of the air outlets of the upper duct segment is less than that of the air outlets of the lower duct segment; in the state that each of the duct segments is connected to form the duct body, a heating jacket covers the outer wall of the duct body, and in the working state, the temperature in the duct body is heated to 30-120℃; a waste gas recovery device is arranged below the duct body, the waste gas recovery device comprises a plurality of recovery segments arranged coaxially and in the shape of a trapezoid in the front view, and the bottom of the terminal recovery segment is provided with a yarn outlet, a plurality of air inlets are annularly arranged on the upper inner wall of each of the recovery segments, through which gas is supplied into the recovery segment; a plurality of air outlets are annularly arranged on the lower inner wall of each of the recovery segments, through which the waste gas in each of the recovery segments is diluted and discharged.

2. The spinning duct according to claim 1, wherein, the flow rate of the spinning solution in the duct body is 300-500 m / min.

3. The spinning duct according to claim 1, wherein, the length of the duct body is 5-8 m.

4. The spinning duct according to claim 1, wherein, each of the duct segments comprises an upper duct segment, a middle duct segment and a lower duct segment, wherein, the air inlet velocity at the air inlets of the upper duct segment is 0.3-1.0 m / s, and the air outlet velocity at the air outlets is 0.3-0.5 m / s; the air inlet velocity at the air inlets of the middle duct segment is 0.3-0.7 m / s, and the air outlet velocity at the air outlets is 0.3-0.7 m / s; the air inlet velocity at the air inlets of the lower duct segment is 0.3-0.5 m / s, and the air outlet velocity at the air outlets is 0.3-1.0 m / s.

5. The spinning duct according to claim 1, wherein, the gas supplied into the duct segment through the air inlets is a mixed gas of organic gas and carrier gas, and the concentration of the organic gas is 22-28%.

6. The spinning duct according to claim 5, wherein, the organic gas is ammonia, which enters each of the duct segments through the air inlets and enters a waste gas treatment system through the air outlets.

7. The spin orifice of claim 1 wherein, further comprising, a temperature sensor arranged on the inner wall of the middle part of each of the duct segments.

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