Swelling spinning system

Abstract

The invention relates to the technical field of swelling spinning, in particular to a swelling spinning system which comprises a swelling device (1), a feeding hopper (2), an extruder (3), a metering pump (4), a pressure stabilizing device (5), a spinning box body (6), a drawing roller (7) and a winding machine (8) which are connected in sequence. Wherein the pressure stabilizing device (5) comprises a shell (51) and a diaphragm (52) arranged in the shell (51), and the shell (51) is divided into an upper cavity (53) and a lower cavity (54) by the sealing diaphragm (52); buffer gas is sealed in the upper cavity, and a feed port (55) and a discharge port (56) are formed in the lower cavity (54); and the feed port (55) is connected with the metering pump (4), and the discharge port (56) is connected with the spinning manifold (6). According to the swelling spinning system provided by the invention, the pressure stabilizing device is arranged, so that the spinning solution can enter the spinning box body at a constant pressure, and the uniformity of fibers can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of swelling spinning, and in particular to a swelling spinning system. Background Art

[0002] The spinning solution is incompressible and viscoelastic. During the spinning process, as the metering pump operates, the spinning solution output by the metering pump exhibits periodic fluctuations. This fluctuation not only reduces the uniformity of the fiber, but also affects the stability of the spinning process.

[0003] Therefore, there is an urgent need to provide a swelling spinning system that can stabilize the spinning solution pressure and improve the uniformity of fiber filaments. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem of fiber non-uniformity in the prior art and to provide a swelling spinning system.

[0005] In order to achieve the above-mentioned object, the present invention provides a swelling spinning system, wherein the system comprises a swelling device 1, a feeding hopper 2, an extruder 3, a metering pump 4, a voltage stabilizing device 5, a spinning manifold 6, a drafting roller 7 and a winder 8 connected in sequence;

[0006] Among them, the pressure stabilizing device 5 includes a shell 51 and a diaphragm 52 arranged in the shell 51, and the sealing diaphragm 52 divides the shell 51 into an upper cavity 53 and a lower cavity 54; the upper cavity 53 is sealed with buffer gas, and the lower cavity 54 is provided with a feed port 55 and a discharge port 56, wherein the feed port 55 is connected to the metering pump 4, and the discharge port 56 is connected to the spinning box 6.

[0007] The swelling spinning system provided in the present invention, by arranging a pressure-stabilizing device between the metering pump and the spinning assembly, can utilize the upper cavity to absorb the periodically fluctuating pressure in the spinning solution, so that the spinning solution enters the spinning box at a constant pressure, thereby improving the uniformity of the fiber filaments, improving the performance of the fiber filaments, and enhancing the market competitiveness of the fiber filaments. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of a swelling spinning system provided in the present invention;

[0009] Figure 2 It is a structural schematic diagram of a voltage stabilizing device provided in the present invention.

[0010] Description of Reference Numerals

[0011] 1. Swelling device 2. Feeding hopper 3. Extruder

[0012] 4. Metering pump 5. Voltage stabilizer 6. Spinning box

[0013] 7. Drafting roller 8. Winding machine

[0014] 51, housing 52, diaphragm 53, upper cavity

[0015] 54, lower cavity 55, feed port 56, discharge port

[0016] 57, air injection hole 58, pressure detection device 59, pressure relief valve DETAILED DESCRIPTION

[0017] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0018] A first aspect of the present invention provides a swelling spinning system, wherein the system comprises a swelling device 1, a feeding hopper 2, an extruder 3, a metering pump 4, a voltage stabilizing device 5, a spinning manifold 6, a drafting roller 7 and a winder 8 connected in sequence;

[0019] The pressure stabilizing device 5 includes a housing 51 and a diaphragm 52 arranged in the housing 51, wherein the sealing diaphragm 52 divides the housing 51 into an upper cavity 53 and a lower cavity 54; the upper cavity 53 is sealed with a buffer gas, and the lower cavity 54 is provided with a feed port 55 and a discharge port 56; the feed port 55 is connected to the metering pump 4, and the discharge port 56 is connected to the spinning manifold 6, as shown in FIG. Figure 1-2 shown.

[0020] Among them, in the present invention, the operation of the metering pump causes periodic fluctuations in the spinning solution. A pressure stabilizing device is arranged between the metering pump and the spinning box. The spinning solution from the metering pump enters the lower cavity and contacts the spinning solution through the diaphragm. The buffer gas sealed in the upper cavity can absorb the fluctuating pressure in the spinning solution, so that the spinning solution enters the spinning box at a constant pressure, thereby improving the uniformity of the fiber.

[0021] In one embodiment of the present invention, the material of the diaphragm 52 is selected from a flexible polymer; wherein the flexible polymer is selected from one or more of fluororubber film, polyimide rubber film, hydrogenated nitrile rubber film, sodium butadiene rubber film, preferably fluororubber film.

[0022] Among them, in the present invention, the diaphragm is airtight, high temperature resistant and chemical corrosion resistant, and the shell can be divided into an upper cavity and a lower cavity, wherein the lower cavity is a flow channel for the spinning solution, and the upper cavity is used to seal the buffer gas.

[0023] In a preferred embodiment of the present invention, the volume ratio of the upper cavity 53 to the lower cavity 54 is 1:0.5-1.5, preferably 1:0.8-1.2.

[0024] Among them, in the present invention, if the volume of the upper cavity is too small, the buffer space is too small, and the voltage stabilization effect is not good enough; if the volume of the upper cavity is too large, the voltage stabilization effect is delayed, which is not conducive to voltage stabilization. When the volume ratio of the upper cavity to the lower cavity is within the above-defined range, the voltage stabilization effect of the voltage stabilizing device is the best.

[0025] In one embodiment of the present invention, the buffer gas is selected from one or more of air, carbon dioxide, nitrogen, and argon, preferably nitrogen.

[0026] In one embodiment of the present invention, the upper cavity 53 is provided with an injection hole 57, a pressure detection device 58 and an optional pressure relief valve 59. The injection hole is provided with an injection valve, through which buffer gas can be injected into the upper cavity and the pressure of the buffer gas can be adjusted. When the pressure in the upper cavity is too high, the pressure can be relieved through the pressure relief valve. The pressure detection device can preferably be a pressure gauge.

[0027] In one embodiment of the present invention, the pressure of the buffer gas is P mid 80%-120%, preferably 90-110%; wherein P mid It is the average of the maximum and minimum pressures of the spinning solution.

[0028] In the present invention, the pressure of the spinning solution output by the metering pump fluctuates within a certain range, and the average value of the minimum and maximum values ​​within the fluctuation range is recorded as P mid The inventors have found through research that when the pressure of the buffer gas is close to P mid When the voltage is stabilized, the voltage stabilizing effect of the voltage stabilizer is the best.

[0029] In a preferred embodiment of the present invention, the cross-sectional areas of the feed port 55 and the discharge port 56 are the same. In the present invention, the feed port and the discharge port on the lower cavity are set to be the same, which can further reduce the pressure fluctuation of the spinning solution.

[0030] In a preferred embodiment of the present invention, the swelling device 1, feeding hopper 2, extruder 3, metering pump 4, voltage stabilizing device 5, spinning manifold 6, drafting roller 7 and winder 8 are all conventional equipment in the field, and the present invention does not make any special limitation thereto.

[0031] Among them, in the present invention, the swelling device can be a swelling kettle and / or swelling tank with stirring and heating functions. In order to reduce the difficulty of feeding the feeding hopper, it is preferred to set a stirrer and a heating device in the feeding hopper. The stirrer can be a spiral stirring blade, and the heating device can be used to maintain the temperature of the spinning solution and reduce the viscosity of the spinning solution. The extruder can be a screw extruder, and the metering pump is preferably a gear pump.

[0032] In a preferred embodiment of the present invention, the swelling device 1, the feeding hopper 2, the extruder 3, the metering pump 4, the voltage stabilizing device 5, the spinning manifold 6, the drafting roller 7 and the winder 8 are sequentially connected through a spinning pipeline.

[0033] The present invention will be described in detail below through examples.

[0034] Example 1

[0035] Example 1 Figure 1 The system shown in the figure is carried out. The diaphragm of the pressure stabilizing device is a fluororubber membrane, the volume ratio of the upper cavity and the lower cavity is 1:1, 2500Pa of nitrogen is sealed in the upper cavity, the diameters of the feed port and the discharge port on the lower cavity are the same, and the pressure fluctuation range of the spinning solution output by the metering pump is 2300-2700Pa.

[0036] Polyethylene powder and decahydronaphthalene are added into a swelling kettle at a mass ratio of 1:13.5, and stirred at 80°C for 3 hours to obtain a spinning solution; the obtained spinning solution enters the spinning manifold through a feeding hopper, a screw extruder, a metering pump and a voltage stabilizing device in sequence, and the spindle yarn ejected from the spinning manifold is stretched 400 times by a stretching roller and then collected by a winder to obtain fiber yarn.

[0037] The strength variation coefficient of the fiber filaments was tested using the standard GB / T 14344-2008. The test results showed that the strength variation coefficient of the fiber filaments was 3.5%.

[0038] Example 2

[0039] The same as Example 1, except that 2400Pa of nitrogen is sealed in the upper cavity.

[0040] The strength variation coefficient of the fiber filaments was tested using the standard GB / T 14344-2008. The test results showed that the strength variation coefficient of the fiber filaments was 4.0%.

[0041] Example 3

[0042] The same as Example 1, except that 2600Pa of nitrogen is sealed in the upper cavity.

[0043] The strength variation coefficient of the fiber yarn was tested using the standard GB / T 14344-2008. The test results showed that the strength variation coefficient of the fiber yarn was 3.9%.

[0044] Comparative Example 1

[0045] The same as Example 1, the difference is that the voltage stabilizer is omitted, that is, the voltage stabilizer is not connected between the metering pump and the spinning manifold.

[0046] The strength variation coefficient of the fiber filaments was tested using the standard GB / T 14344-2008. The test results showed that the strength variation coefficient of the fiber filaments was 6.5%.

[0047] Among them, it can be seen from the test results of comparative example 1 and comparative example 1 that, under the same conditions, by setting a voltage stabilizing device, the strength variation coefficient of the fiber yarn can be reduced from 6.5% to 3.5%, which is obviously a huge progress in this field and is of great significance for the production of fiber yarn.

[0048] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A swelling spinning system, characterized in that: The system comprises a swelling device (1), a feeding hopper (2), an extruder (3), a metering pump (4), a voltage stabilizing device (5), a spinning manifold (6), a drafting roller (7) and a winder (8) which are connected in sequence; The pressure stabilizing device (5) comprises a shell (51) and a diaphragm (52) arranged in the shell (51); the sealing diaphragm (52) divides the shell (51) into an upper cavity (53) and a lower cavity (54); a buffer gas is sealed in the upper cavity (53); a feed port (55) and a discharge port (56) are arranged in the lower cavity (54); the feed port (55) is connected to the metering pump (4), and the discharge port (56) is connected to the spinning box (6).

2. The swelling spinning system according to claim 1, wherein: The material of the diaphragm (52) is selected from flexible polymers.

3. The swelling spinning system according to claim 2, wherein: The flexible polymer is selected from one or more of fluororubber film, polyimide film, hydrogenated nitrile rubber film, sodium butadiene rubber film, preferably fluororubber film.

4. The swelling spinning system according to any one of claims 1 to 3, wherein: The volume ratio of the upper cavity (53) to the lower cavity (54) is 1:0.5-1.

5.

5. The swelling spinning system according to claim 4, wherein: The volume ratio of the upper cavity (53) to the lower cavity (54) is 1:0.8-1.

2.

6. The swelling spinning system according to any one of claims 1 to 5, wherein: The buffer gas is selected from one or more of air, carbon dioxide, nitrogen and argon, preferably nitrogen.

7. The swelling spinning system according to any one of claims 1 to 6, wherein: The upper cavity (53) is provided with an air injection hole (57), a pressure detection device (58) and an optional pressure relief valve (59).

8. The swelling spinning system according to any one of claims 1 to 7, wherein: The pressure of the buffer gas is P mid 80%-120%; among them, P mid It is the average of the maximum and minimum pressures of the spinning solution.

9. The swelling spinning system according to claim 8, wherein: The pressure of the buffer gas is P mid 90-110%.

10. The swelling spinning system according to any one of claims 1 to 9, wherein: The cross-sectional areas of the feed port (55) and the discharge port (56) are the same.

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