CN115253388A - Continuous and rapid defoaming method for high-viscosity spinning fluid - Google Patents
Continuous and rapid defoaming method for high-viscosity spinning fluid Download PDFInfo
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- CN115253388A CN115253388A CN202210660718.8A CN202210660718A CN115253388A CN 115253388 A CN115253388 A CN 115253388A CN 202210660718 A CN202210660718 A CN 202210660718A CN 115253388 A CN115253388 A CN 115253388A
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- 239000012530 fluid Substances 0.000 title claims abstract description 103
- 238000009987 spinning Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000155 melt Substances 0.000 claims description 35
- 238000001914 filtration Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims 2
- 229920006253 high performance fiber Polymers 0.000 abstract description 6
- 230000008859 change Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 2
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229920003366 poly(p-phenylene terephthalamide) Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000004760 aramid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229920000927 poly(p-phenylene benzobisoxazole) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0036—Flash degasification
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- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention belongs to the field of high-performance fiber processing, and provides a continuous and rapid defoaming method for high-viscosity spinning fluid.
Description
Technical Field
The invention belongs to the field of high-performance fiber processing, and particularly relates to a continuous and rapid defoaming method for a high-viscosity spinning fluid.
Background
The high-performance fiber has outstanding comprehensive performance and is widely applied to the fields of national defense, military industry, aerospace and aviation and special civil use, so that the high-performance fiber is rapidly developed in recent years. In order to obtain excellent performances such as high strength, high modulus, high heat resistance and the like, high-performance fibers generally adopt a high-rigidity aromatic heterocyclic structure, typically poly (p-Phenylene Benzobisoxazole) (PBO), poly (p-phenylene terephthalamide) (PPTA), polyimide (PI) and the like, and polymers with the aromatic heterocyclic structure have poor dissolving capacity, so that the high-performance fiber spinning fluid generally has very high viscosity and is extremely difficult to defoam. Residual bubbles in the spinning fluid can cause the increase of broken ends and broken filaments in the spinning process, and micropore defects are formed in finished fibers, so that the mechanical property of the fibers is poor, and the heat resistance and the weather resistance are greatly reduced. Therefore, effective measures must be taken to completely remove the bubbles before spinning, but the diffusion speed of the bubbles in the high-viscosity spinning fluid is slow, the bubble removal efficiency is low, and the production efficiency of subsequent fibers and the improvement of the product performance are restricted.
At present, the defoaming of the domestic high-viscosity spinning fluid generally comprises a vacuum standing defoaming method, a vacuum stirring defoaming method, a film defoaming method and the like. Vacuum standing and defoaming are generally carried out in a defoaming kettle, and bubbles in standing spinning fluid overflow from the inside to a position above the liquid level under the action of pressure difference to complete the defoaming process. The disadvantages are too long defoaming time, continuous operation and low efficiency. The vacuum stirring defoaming method is to vacuumize while stirring, and the bubbles are eliminated from the spinning fluid under the combined action of pressure difference and mechanical stirring force. The disadvantage is that bubbles may be involved again during the stirring process, which affects the final defoaming effect. In the film defoaming method, fluid flows through an umbrella-shaped part, the fluid flows along the umbrella-shaped part under the action of gravity to form a thin-layer liquid film, and bubbles can be removed by vacuumizing in the process. The problem is that for fluids with very high viscosity it is difficult to form a thin liquid film on the umbrella, the higher the viscosity the lower the efficiency.
Therefore, how to better solve the problem of continuous and quick deaeration of the high-viscosity spinning fluid becomes one of the difficulties in the field.
Disclosure of Invention
The invention provides a method for continuously and quickly defoaming high-viscosity spinning fluid, which aims at various defects in the prior art, and provides a method for continuously and quickly defoaming high-viscosity spinning fluid.
The specific technical scheme of the invention is as follows:
a continuous and rapid defoaming method for high-viscosity spinning fluid comprises the following specific steps:
conveying high-viscosity spinning fluid to a melt filter through a conveying pipeline, controlling the pressure difference between the front and the back of the melt filter within 6MPa, filtering the spinning fluid through the melt filter, then feeding the filtered spinning fluid into an upper feeding port of a double-screw extruder through a fluid conveying pipeline, forcibly conveying the spinning fluid through a double screw to be extruded out from a pressurizing sieve plate at a lower discharging port, directly feeding the high-viscosity spinning fluid into a vacuum chamber after extruding the spinning fluid from the pressurizing sieve plate in a solution trickle mode, wherein the vacuum chamber achieves the vacuum degree of-0.03 MPa to-0.06 MPa, and actively overflowing bubbles in the high-viscosity spinning trickle by utilizing vacuum to realize defoaming; the defoamed high-viscosity spinning trickle falls into a screw output device, is conveyed into a fluid output pipeline through the screw output device, and is subjected to subsequent spinning procedures,
the continuous and rapid defoaming equipment for the high-viscosity spinning fluid comprises a double-screw extruder, wherein a feed inlet of the double-screw extruder is connected with a melt filter, a lower discharge outlet of the double-screw extruder is provided with a pressurizing sieve plate and is directly connected with a vacuum chamber, and the lower end of the vacuum chamber is connected with a screw output device.
The more concrete structure of the high-viscosity spinning fluid continuous and rapid defoaming equipment is as follows:
the inlet end of the double-screw extruder is connected with a melt filter, the inlet of the melt filter is connected with a fluid input pipeline, a pre-filtering pressure gauge is arranged on the fluid input pipeline, and the melt filter is connected with an upper feed inlet of the double-screw extruder through a filtered fluid conveying pipeline; the lower discharge port of the double-screw extruder is provided with a pressurizing sieve plate which is directly connected with a vacuum chamber, and the lower end of the vacuum chamber is connected with a screw output device.
Preferably, the pressurizing sieve plate is arranged at the lower discharge port of the double-screw extruder, is circular, has the diameter of 50-150mm and the thickness of 3-5 mm, and is provided with 4-8 small holes with the hole diameter of 0.3-0.6 mm and the hole interval of 3-8 mm;
the melt filter adopts a double-cylinder continuous switching melt filter, the filtering precision is 5-20 mu m, the working temperature is 100-230 ℃, and the allowable differential pressure is 6-10 Mpa; when the melt filter works continuously, the current back pressure difference exceeds 10MPa, the filter is switched, and the other cylinder filter works, so that continuous high-efficiency filtration is realized, a pressurizing sieve plate is prevented from being blocked by impurities, and a commercially available double-cylinder continuous switching melt filter is selected.
The length-diameter ratio of the screw of the double-screw extruder is 1: 30-1: 50, the screw element adopts a conveying block with a lead of 48-64 mm, the temperature control range is 80-230 ℃, the rotating speed of the screw is 30-60 rpm, and the pressure of a working machine head is 5-15Mpa;
when the double-screw extruder continuously conveys the spinning fluid, the temperature and the screw rotating speed of each zone of the extruder are adjusted according to the state of the spinning fluid extruded from the pressurizing sieve plate, the apparent viscosity of the fluid is controlled through the change of the temperature, the conveying pressure of the fluid is controlled through the screw rotating speed, the shearing rate and the stress when the fluid is extruded from the pore channel of the pressurizing sieve plate are further regulated and controlled, the phenomenon that the melt is broken and adheres to the plate or is adhered to the plate is avoided, the spinning fluid drops in a thin stream shape in a strand manner, the specific surface area is increased, and the defoaming efficiency is improved.
The vacuum chamber is also provided with a thermometer, an observation window and a vacuum meter and is connected to the vacuum pump through a gas path; the diameter of the vacuum chamber is 50-150mm, the diameter is more than or equal to that of the pressurizing sieve plate, the height is 50-100 mm, and an observation window is arranged on the side surface to observe the vacuum pumping condition; the vacuum pump is preferably of a water ring type;
the screw form in the screw output device can be a single screw or a double screw, more preferably, the screw 1 to 3 stages are a conveying section, the lead is 48-64mm, the screw 4-6 stages are a meshing section, the lead is 48-64 mm, the good material fullness of the section is kept so as to ensure the good air seal in the whole screw output device 16 and ensure the vacuum degree in the vacuum chamber 8, the screw 7-9 stages are the conveying sections, the lead is 48-64 mm, and a fluid output pipeline is connected in the conveying section; an external heating jacket is arranged outside the screw output device, so that a stable temperature environment is provided for the screw output device.
By adopting the defoaming method, the high-viscosity spinning fluid is conveyed to a melt filter through a conveying pipeline, a pre-filtering pressure gauge and a post-filtering pressure gauge are respectively arranged at the front and the rear of the filter, the front and rear pressure difference of the melt filter is controlled within 6MPa, the spinning fluid is filtered by the melt filter, enters an upper feeding port of a double-screw extruder through a post-filtering fluid conveying pipeline and is extruded from a pressurizing sieve plate of a lower discharging port through double-screw forced conveying, the double-screw extruder can provide extrusion pressure of 5-15MPa for the high-viscosity spinning fluid, the high-viscosity spinning fluid is extruded from the pressurizing sieve plate in a solution trickle form and directly enters a vacuum chamber, the vacuum chamber can reach a vacuum degree of-0.03 MPa to-0.06 MPa, at the moment, the rapid change of the pressure can promote the bubbles in the high-viscosity spinning trickle to actively overflow after the high-viscosity spinning trickle is extruded from a pressurizing sieve plate at the head of the high-pressure extruder and enters the vacuum chamber, and the specific surface area of the spinning trickle extruded by the pressurizing sieve plate is obviously larger, so that the vacuum defoaming efficiency is greatly improved; and the defoamed high-viscosity spinning trickle falls into a screw output device, and is conveyed into a fluid output pipeline through the screw output device to perform a subsequent spinning process.
In summary, with the defoaming equipment provided by the present invention, the high viscosity fluid is filtered and then is transported to the twin-screw extruder, and is transported to the pressurizing sieve plate by the extruder, the pressurizing sieve plate is installed at the lower discharge port of the twin-screw extruder, the fluid is extruded from the pressurizing sieve plate in the form of high pressure solution trickle under the action of screw forced transport, enters the vacuum chamber, and is subjected to drastic pressure change from high pressure to vacuum, so as to prompt the bubbles to rapidly overflow from the inside of the solution trickle, and is taken away by the vacuum system, thereby completing the defoaming process, and the defoamed high viscosity spinning fluid is transported to the subsequent spinning link through the screw output device, so as to realize continuous and rapid defoaming of the high viscosity spinning fluid, with high efficiency and continuous operation, and the high viscosity spinning fluid is defoamed in the form of solution trickle, the specific surface area is greatly increased, and the rapid pressure change from high pressure to vacuum can force the bubbles to actively overflow, and the defoaming effect is excellent, and is particularly suitable for continuous defoaming of high viscosity spinning fluids such as PBO fiber, aramid fiber, polyimide fiber, and the like.
Drawings
FIG. 1 is a schematic structural diagram of the continuous and rapid defoaming equipment for the high-viscosity spinning fluid according to the present invention,
figure 2 is a schematic view of the construction of a pressurized screen deck,
in the figure, 1 is a spinning solution conveying pipeline, 2 is a melt filter, 3 is a pre-filtering pressure gauge, 4 is a post-filtering pressure gauge, 5 is a post-filtering fluid conveying pipeline, 6 is a double-screw extruder, 7 is a pressurizing sieve plate, 8 is a vacuum chamber, 9 is a thermometer, 10 is an observation window, 11 is a spinning solution trickle, 12 is a vacuum gauge, 13 is a vacuum gas circuit, 14 is a vacuum pump, 15 is an external heating jacket, 16 is a screw output device, 17 is a transmission belt, 18 is a rotating motor, and 19 is a fluid output pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1 process example
A method for continuously and quickly defoaming high-viscosity spinning fluid comprises the following specific steps:
conveying high-viscosity spinning fluid to a melt filter through a conveying pipeline, controlling the pressure difference between the front and the back of the melt filter within 6MPa, filtering the spinning fluid through the melt filter, then feeding the filtered spinning fluid into an upper feeding port of a double-screw extruder through a fluid conveying pipeline, forcibly conveying the spinning fluid through a double screw to be extruded out from a pressurizing sieve plate at a lower discharging port, directly feeding the high-viscosity spinning fluid into a vacuum chamber after extruding the spinning fluid from the pressurizing sieve plate in a solution trickle mode, wherein the vacuum chamber achieves the vacuum degree of-0.03 MPa to-0.06 MPa, and actively overflowing bubbles in the high-viscosity spinning trickle by utilizing vacuum to realize defoaming; and the defoamed high-viscosity spinning trickle falls into a screw output device, and is conveyed into a fluid output pipeline through the screw output device to perform a subsequent spinning process.
Wherein the fuse-element filter chooses the double-cylinder to switch over the fuse-element filter in succession, and when continuous operation, current back pressure differential surpasses 10MPa, carries out the filter and switches, carries out work by another jar filter to realize continuous high-efficient filtration, avoid the pressure boost sieve to be blockked up by impurity.
When the double-screw extruder is used for continuously conveying the spinning fluid, the temperature and the screw rotating speed of each zone of the extruder are adjusted according to the state of the spinning fluid extruded from the pressurizing sieve plate, the apparent viscosity of the fluid is controlled through the change of the temperature, the conveying pressure of the fluid is controlled through the screw rotating speed, the shearing rate and the stress of the fluid extruded from the pore channel of the pressurizing sieve plate are further regulated, the phenomenon that the melt is broken and sticks to the plate or is adhered is avoided, the spinning fluid falls in a thin-flow shape in strands, the specific surface area is increased, and the defoaming efficiency is improved.
The method can realize continuous and rapid defoaming of the high-viscosity spinning fluid, has high efficiency and continuous operation, and the high-viscosity spinning fluid is defoamed in a solution trickle mode, so that the specific surface area is greatly increased, the rapid pressure change from high pressure to vacuum can force the bubbles to actively overflow, the defoaming effect is excellent, and the method is particularly suitable for continuous defoaming of high-viscosity spinning fluids such as PBO fibers, aramid fibers, polyimide fibers and the like.
Example 2 apparatus example
As shown in fig. 1-2, in the apparatus for continuously and rapidly debubbling the high viscosity spinning fluid, an inlet end of a twin-screw extruder 6 is connected with a melt filter 2, an inlet of the melt filter 2 is connected with a fluid input pipeline 1, a pre-filtration pressure gauge 3 is arranged on the fluid input pipeline 1, and the melt filter 2 is connected with an upper feed inlet of the twin-screw extruder 6 through a filtered fluid conveying pipeline 5; a pressurizing sieve plate 7 is arranged on a lower discharge port of the double-screw extruder, and is directly connected with a vacuum chamber 8 through the pressurizing sieve plate 7, and the lower end of the vacuum chamber 8 is connected with a screw output device 16; a filtered fluid conveying pipeline 5 is provided with a filtered pressure gauge 4;
preferably, the pressurizing sieve plate 7 is arranged at the lower discharge port of the double-screw extruder, is circular in shape, has the diameter of 50-150mm and the thickness of 3-5 mm, and is provided with 4-8 small holes with the hole diameter of 0.3-0.6 mm and the hole interval of 3-8 mm;
after the structure is adopted, high-viscosity spinning fluid is conveyed to a melt filter 2 through a conveying pipeline 1, a pre-filtering pressure gauge 3 and a post-filtering pressure gauge 4 are respectively arranged at the front and the rear of the filter, the front and rear pressure difference of the melt filter 2 is controlled within 6MPa, the spinning fluid is filtered by the melt filter 2, enters an upper feeding port of a double-screw extruder through a post-filtering fluid conveying pipeline 5 and is extruded from a pressurizing sieve plate 7 at a lower discharging port through double-screw forced conveying, the double-screw extruder can provide extrusion pressure of 5-15MPa for the high-viscosity spinning fluid, the high-viscosity spinning fluid is extruded from the pressurizing sieve plate 7 in a solution trickle form and directly enters a vacuum chamber 8, the vacuum degree of-0.03 MPa to-0.06 MPa in the vacuum chamber 8 can be reached, at the moment, after the high-viscosity spinning trickle 11 is extruded from the pressurizing sieve plate of the high-pressure extruder head to enter the vacuum chamber forcibly, the rapid pressure change can promote the bubbles in the high-viscosity spinning trickle 11 to overflow actively, and the specific surface area of the extruded trickle is obviously larger, so that the vacuum spinning efficiency is greatly improved; the defoamed high-viscosity spinning trickle 11 falls into a screw output device 16, is conveyed into a fluid output pipeline 19 through the screw output device, and is subjected to a subsequent spinning process;
the melt filter 2 is a commercially available double-cylinder continuous switching melt filter, the filtering precision is 5-20 μm, the working temperature is 100-230 ℃, and the allowable differential pressure is 6-10 Mpa;
the length-diameter ratio of the screw of the double-screw extruder is 1: 30-1: 50, the screw element adopts a conveying block with a lead of 48-64 mm, the temperature control range is 80-230 ℃, the rotating speed of the screw is 30-60 rpm, and the pressure of a working machine head is 5-15Mpa;
the vacuum chamber 8 is also provided with a thermometer 9, an observation window 10 and a vacuum meter 12, and the vacuum chamber 8 is connected to a vacuum pump 14 through a gas path 13; the diameter of the vacuum chamber is 50-150mm, the diameter of the pressurizing sieve plate 7 is more than or equal to the diameter of the pressurizing sieve plate, the height of the vacuum chamber is 50-100 mm, and an observation window 10 is arranged on the side surface of the vacuum chamber, so that the vacuumizing condition can be observed; the vacuum pump 14 is preferably a water ring;
the screw form in the screw output device 16 can be a single screw or a double screw, more preferably, the screw has a conveying section in 1 to 3 stages, a lead of 48 to 64mm, a meshing section in 4 to 6 stages and a lead of 48 to 64mm, so as to ensure good air seal in the whole screw output device 16 and ensure the vacuum degree in the vacuum chamber 8, and a conveying section in 7 to 9 stages, which is also 48 to 64mm, and a fluid output pipeline 19 is connected in the conveying section; an external heating jacket 15 is arranged outside the screw output device 16 to provide a stable temperature environment for the screw output device 16, and a rotating motor 18 is arranged outside the screw output device 16 to drive the screw in the screw output device 16 to rotate through a conveyor belt 17.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A method for continuously and quickly defoaming high-viscosity spinning fluid is characterized by comprising the following steps: the method comprises the following specific steps:
conveying high-viscosity spinning fluid to a melt filter through a conveying pipeline, controlling the pressure difference between the front and the back of the melt filter within 6MPa, filtering the spinning fluid through the melt filter, then feeding the filtered spinning fluid into an upper feeding port of a double-screw extruder through a fluid conveying pipeline, forcibly conveying the spinning fluid through a double screw to be extruded out from a pressurizing sieve plate at a lower discharging port, directly feeding the high-viscosity spinning fluid into a vacuum chamber after extruding the spinning fluid from the pressurizing sieve plate in a solution trickle mode, wherein the vacuum chamber achieves the vacuum degree of-0.03 MPa to-0.06 MPa, and actively overflowing bubbles in the high-viscosity spinning trickle by utilizing vacuum to realize defoaming; the defoamed high-viscosity spinning trickle falls into a screw output device, and is conveyed into a fluid output pipeline through the screw output device to perform a subsequent spinning process;
the adopted high-viscosity spinning fluid continuous and rapid defoaming equipment comprises a double-screw extruder, wherein a feed inlet of the double-screw extruder is connected with a melt filter, a pressurizing sieve plate is arranged on a discharge outlet of the double-screw extruder and is directly connected with a vacuum chamber, and the lower end of the vacuum chamber is connected with a screw output device.
2. The continuous and rapid debubbling method of the high viscosity spinning fluid as claimed in claim 1, wherein:
the adopted high-viscosity spinning fluid continuous and rapid defoaming equipment comprises a double-screw extruder (6), wherein the inlet end of the double-screw extruder (6) is connected with a melt filter (2), the inlet of the melt filter (2) is connected with a fluid input pipeline (1), and the melt filter (2) is connected with an upper feed inlet of the double-screw extruder (6) through a filtered fluid conveying pipeline (5); a pressurizing sieve plate (7) is arranged on a lower discharge port of the double-screw extruder (6), a vacuum chamber (8) is directly connected with the pressurizing sieve plate (7), and the lower end of the vacuum chamber (8) is connected with a screw output device (16).
3. The continuous and rapid debubbling method for the high viscosity spinning fluid as claimed in claim 4, wherein:
the melt filter (2) selects a double-cylinder continuous switching melt filter, the filtering precision is 5-20 μm, the working temperature is 100-230 ℃, and the allowable differential pressure is 6-10 Mpa; a pre-filtering pressure gauge (3) and a post-filtering pressure gauge (4) are respectively arranged at the front and the back of the melt filter (2); when the melt filter (2) continuously works, the current back pressure difference exceeds 10MPa, the filter is switched, and the other cylinder filter works.
4. The continuous and rapid debubbling method for the high viscosity spinning fluid as claimed in claim 4, wherein: the pressurizing sieve plate (7) is circular, the diameter is 50-150mm, the thickness is 3-5 mm, 4-8 circles of small holes are distributed on the plate, the aperture is 0.3-0.6 mm, and the hole distance is 3-8 mm.
5. The continuous and rapid degassing method of high viscosity spinning fluid according to claim 4, characterized in that:
the length-diameter ratio of a screw of the double-screw extruder (6) is 1-1.
6. The continuous and rapid degassing method of high viscosity spinning fluid according to claim 4, characterized in that:
the vacuum chamber (8) is also provided with a thermometer (9), an observation window (10) and a vacuum meter (12), and the vacuum chamber (8) is connected to a vacuum pump (14) through a vacuum gas circuit (13); the diameter of the vacuum chamber (8) is 50-150mm, the height is 50-100 mm, and the vacuum pump (14) is a water ring vacuum pump.
7. The continuous and rapid defoaming method of the high viscosity spinning fluid according to claim 1, characterized in that:
the screw form in the screw output device (16) is single screw or double screw, the screw 1 to 3 stages are conveying sections, the lead is 48-64mm, the screw 4-6 stages are meshing sections, the lead is 48-64mm, the screw 7-9 stages are conveying sections, the lead is 48-64 mm, and the fluid output pipeline (19) is connected in the conveying sections.
8. The continuous and rapid defoaming method of the high viscosity spinning fluid according to claim 1, characterized in that:
an external heating jacket (15) is arranged on the outer side of the screw output device (16), a rotating motor (18) is further arranged on the outer side of the screw output device (16), and the screw in the screw output device (16) is driven to rotate through a conveying belt (17).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115772233A (en) * | 2022-11-22 | 2023-03-10 | 宜宾丝丽雅集团有限公司 | Defoaming process and system for producing regenerated cellulose based on low-temperature alkali urea method |
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