CN112981573A - Preparation facilities of fluoropolymer fully drawn yarn - Google Patents
Preparation facilities of fluoropolymer fully drawn yarn Download PDFInfo
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- CN112981573A CN112981573A CN202110156051.3A CN202110156051A CN112981573A CN 112981573 A CN112981573 A CN 112981573A CN 202110156051 A CN202110156051 A CN 202110156051A CN 112981573 A CN112981573 A CN 112981573A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/04—Melting filament-forming substances
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/02—Spinnerettes
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
- D01F13/04—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of synthetic polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a preparation device of fluoropolymer fully drawn yarn, which comprises a screw extruder, a spinning box, a suction device, a spinning channel, a oiling wheel, a godet wheel, a first drawing roller, a second drawing roller, a third drawing roller, a relaxation heat setting roller and a winding machine, wherein the spinning channel is arranged on the upper surface of the screw extruder; and a metering pump and a spinning nozzle are integrated in the spinning box. The invention is additionally provided with the suction device to suck and treat trace overflowing corrosive gas, thereby being safe and environment-friendly. The relaxation heat setting roller is additionally arranged for performing controlled shrinkage heat setting on the fiber, relaxing the internal stress of the fiber, reducing the heat shrinkage rate of the fiber, improving the creep resistance of the fiber, strengthening the heat setting effect of the fiber and improving the dimensional stability of the fiber. The device can realize one-step spinning, drawing, heat setting and winding to produce the fluoropolymer fully drawn yarn, has the characteristics of high temperature resistance and corrosion resistance, is simple and convenient in production process and high in production efficiency, and provides a basis for the industrial preparation of the fluoropolymer fiber.
Description
Technical Field
The invention relates to the field of chemical fiber manufacturing equipment, in particular to a device for preparing fluorine-containing polymer fully drawn yarns.
Background
With the continuous progress of science and technology, the living standard is increasingly improved, and the requirement of environmental protection is also increasingly high. The fluorine-containing polymer fiber has good performances of environmental resistance, high temperature resistance, low friction, self-cleaning and the like, so the fluorine-containing polymer fiber can be applied to the industries of high temperature, high humidity and high viscosity dust and the industrial smoke purification of acid-base and corrosive chemical gases, and can also be used as a preparation material of bag filters of coal-fired furnaces, oil-fired boilers, waste incinerators and the like, thereby playing an increasingly important role in the field of filtering high-temperature corrosive smoke.
The fluoropolymer fiber with the largest amount used at present is polytetrafluoroethylene fiber, is generally produced by a film splitting method, and can be well applied to the production of bag filter cloth. However, when the film is used as a sewing thread in sewing a bag filter, the cut fiber of the film has a flat cross section, which often causes difficulty in sewing. Further, although the cross section of the polytetrafluoroethylene fiber produced by the polytetrafluoroethylene paste method is nearly circular, various additives used in the paste preparation are removed in the later stage of production, which imposes a burden on the environment, and the polytetrafluoroethylene paste method affects the continuity, size increase and automation of the production process. Due to the special structure of the fluorine-containing polymer, the melting point is high, the melt viscosity is high, the fluidity is poor, corrosive gas can be released in the melting process, and certain difficulty is brought to the melt spinning processing, so that the design of a fluorine-containing polymer fiber preparation device suitable for industrial production is urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a device for preparing a fluorine-containing polymer fully drawn yarn.
The technical scheme for solving the technical problem is to provide a device for preparing the fluoropolymer fully drawn yarn, which is characterized by comprising a screw extruder, a spinning box, a suction device, a spinning channel, a oiling wheel, a godet wheel, a first drawing roller, a second drawing roller, a third drawing roller, a relaxation heat setting roller and a winding machine; a metering pump and a spinning nozzle are integrated in the spinning box;
the tail end of the screw extruder is provided with a spinning box; a suction device is arranged behind a spinning nozzle of the spinning box and is used for sucking and treating corrosive gas generated by the decomposition of the fluorine-containing polymer at high temperature; a spinning channel is arranged behind the suction device; an oil feeding wheel is arranged behind the spinning channel; a godet wheel is arranged behind the oil feeding wheel; a first drawing roller, a second drawing roller and a third drawing roller are sequentially arranged behind the godet wheel and are used for drawing nascent fibers; a relaxation heat setting roller is arranged behind the third stretching roller and is used for controlling shrinkage heat setting of the fibers, reducing the heat shrinkage rate of the fibers, improving the creep resistance of the fibers and strengthening the heat setting effect of the fibers; a winder is arranged behind the loose heat setting roller.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the preparation process of the fluorine-containing polymer fiber, after the fluorine-containing polymer in a molten state is sprayed out from the spray head, trace corrosive gas generated by the decomposition of the fluorine-containing polymer at high temperature can overflow together, so that the suction device is additionally arranged to suck and treat the trace overflowing corrosive gas, and the preparation method is safe and environment-friendly.
(2) The fluorine-containing polymer fiber has stronger thermal shrinkage and creep property, so the invention adds the relaxation heat setting roller on the basis of carrying out tension heat setting on the fiber, is used for carrying out controlled shrinkage heat setting on the fiber, relaxes the internal stress of the fiber, reduces the heat shrinkage rate of the fiber, improves the creep resistance of the fiber, strengthens the heat setting effect of the fiber and improves the size stability of the fiber.
(3) Based on the characteristics that the fluidity of the fluoropolymer in a molten state is poor, the elastic energy is easy to accumulate in the flowing process, the melt is easy to break in melt trickle and the like, the spinneret plate structure with the super-large length-diameter ratio is designed. The diameter and length-diameter ratio of the spinneret orifice of the spinneret plate are different according to the difference of the fluidity of different molten fluorine-containing polymers, so that the elastic property of the fluorine-containing polymer melt in the pore channel flow is released, and the fluorine-containing polymer melt can be smoothly extruded.
(4) In the device, a device which is in contact with the molten fluorine-containing polymer adopts a high-temperature-resistant and corrosion-resistant Hastelloy-2000 alloy material to prevent hydrofluoric acid gas released in the melting process of the fluorine-containing polymer from corroding the device, so that the service life is shortened.
(5) The device takes the fluorine-containing polymer as a raw material, can realize one-step method of spinning, stretching, heat setting and winding to produce the fluorine-containing polymer fully drawn yarn, has the characteristics of high temperature resistance and corrosion resistance, can extract corrosive gas generated in the spinning process and directly discharge the corrosive gas after treatment, has simple and convenient production process and high production efficiency, solves the problem of difficult spinning of the fluorine-containing polymer at present, and also provides a basis for the industrial preparation of the fluorine-containing polymer fiber.
(6) The fluorine-containing polymer fully drawn yarn prepared by the device has good dimensional stability, chemical reagent resistance and excellent mechanical property in a high-temperature complex environment, and is suitable for being used in the high-temperature complex environment.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of an apparatus according to another embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the pumping device of the present invention;
FIG. 4 is a schematic longitudinal sectional view of the suction canister of the present invention;
fig. 5 is a schematic of the position of a set of relaxation heat setting rolls of the present invention.
In the figure, 1, a screw extruder; 2. a spinning box; 3. a pump mount; 4. a metering pump; 5. a spinneret; 6. a suction device; 7. a spinning channel; 8. loading onto a tanker; 9. a godet wheel; 10. a first stretching roller; 11. a second stretching roller; 12. a third stretching roller; 13. loosening the heat setting roller; 14. a winding machine; 61. a suction cylinder; 611. an air exhaust hole; 612. an exhaust hole; 62. an exhaust pipe; 63. a suction pump; 64. and (4) neutralizing the treatment tank.
Detailed Description
Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a device (short for device) for preparing fluoropolymer fully drawn yarn, which is characterized by comprising a screw extruder 1, a spinning box 2, a suction device 6, a spinning channel 7, an oiling wheel 8, a godet wheel 9, a first drawing roller 10, a second drawing roller 11, a third drawing roller 12, a relaxation heat setting roller 13 and a winding machine 14; a metering pump 4 and a spinning nozzle 5 are integrated in the spinning box 2;
the tail end of the screw extruder 1 is provided with a spinning box 2; a suction device 6 is arranged behind a spinning nozzle 5 of the spinning box 2 and is used for sucking and treating trace corrosive gas generated by the decomposition of the fluorine-containing polymer at high temperature; a spinning channel 7 is arranged behind the suction device 6; an oil applying wheel 8 is arranged behind the spinning channel 7; a godet wheel 9 is arranged behind the oil feeding wheel 8 and used for guiding the nascent fiber; a first drawing roller 10, a second drawing roller 11 and a third drawing roller 12 are sequentially arranged behind the godet wheel 9 and are used for drawing nascent fibers; a loose heat setting roller 13 is arranged behind the third stretching roller 12 and is used for controlling shrinkage heat setting of the fibers, so that the heat shrinkage rate of the fibers is reduced, the creep resistance of the fibers is improved, and the heat setting effect of the fibers is enhanced; a winder 14 is provided behind the relaxation heat setting roll 13 to collect the heat-set filament bundle.
Preferably, the suction device 6 comprises a suction cylinder 61, an exhaust pipe 62, a suction pump 63 and a neutralization treatment tank 64; the suction tube 61 is of a double-layer jacketed hollow bottomless and topless cylinder structure consisting of an outer layer and an inner layer, the outer layer is symmetrically provided with two exhaust holes 612 along the circumferential direction of the cylinder body, so that the melt trickle extruded from the spinning nozzle 5 is reduced to be sucked to one side of the inside of the suction tube 61 by the suction pump 63, and the melt trickle is maintained at the central position of the inside of the suction tube 61 as much as possible; the two exhaust holes 612 are respectively communicated with the neutralization treatment tank 64 through respective exhaust pipes 62, and the exhaust pipes 62 are provided with suction pumps 63; the inner layer of the suction cylinder 61 is provided with a plurality of suction holes 611. Under the action of the suction pump 63, the trace hydrofluoric acid gas overflowing from the melt trickle is converged by the suction cylinder 61, and then is sucked into the NaOH aqueous solution at the bottom of the neutralization treatment tank 64, the trace hydrofluoric acid is neutralized by the NaOH aqueous solution and then is discharged to the outdoor, and the non-condensable gas is emptied.
Preferably, the aperture of the pumping hole 611 changes in a gradient manner along the cylinder circumference, the closer to the exhaust hole 612, the smaller the aperture of the pumping hole 611, the largest the aperture of the pumping hole 611 at the longitudinal section of the suction cylinder 61 perpendicular to the line connecting the two exhaust holes 612, and the smallest the aperture of the pumping hole 611 at the exhaust hole 612, so as to further reduce the drift of the melt trickle toward a certain side of the inner wall of the suction cylinder 61.
After the primary stretching of the first stretching roller 10 and the second stretching roller 11 and the secondary stretching of the second stretching roller 11 and the third stretching roller 12, the strength and the modulus of the fiber are greatly improved. The third drawing roller 12 is not only the power of the secondary drawing, but also enables the fiber wound on the high-temperature hot roller to be subjected to heat setting, namely tension heat setting for perfecting the strength and modulus of the fiber, but the heat setting effect is different from that of relaxation heat setting, and the fiber still has certain internal stress, so that the relaxation heat setting roller 13 is additionally arranged.
Preferably, the rotation speed of the relaxation heat setting roller 13 is lower than that of the third stretching roller 12, that is, a measure for controlling shrinkage is taken, so that the residual internal stress in the fiber is further relaxed while the reduction of strength and modulus is reduced as much as possible, the creep deformation and heat shrinkage of the finished fluoropolymer fiber are reduced, the heat setting effect of the fiber is enhanced, and the dimensional stability of the fiber is improved.
Preferably, the fiber between the relaxation heat setting roll 13 and the winder 14 is overfed (the rotation speed of the relaxation heat setting roll 13 is higher than that of the winder 14), which also facilitates the relaxation of the internal stress of the fiber.
Preferably, the diameter of a spinneret orifice of a spinneret plate in the spinneret 5 is 0.3-1.2 mm, and the length-diameter ratio of the spinneret orifice is 3-12: 1, so as to ensure smooth extrusion of the fluoropolymer melt.
Preferably, in order to increase the holding of the fiber by the rollers, the first drawing roller 10, the second drawing roller 11, the third drawing roller 12 and the relaxation heat setting roller 13 are arranged in a set of two rollers, the temperature and the speed of the two rollers in the set are the same, and the fiber is wound around the two rollers in a reciprocating manner. The axes of the two rollers in one group are not parallel, so that the fiber can not be folded.
Preferably, some fluoropolymer chips still have poor flowability after reaching the melting point, and further increase in melt temperature, decrease in melt viscosity, and increase in flowability are required. For example, the melting point of the thermoplastic fluorinated ethylene propylene resin is 265-275 ℃, but the spinning processing temperature is far higher than the melting point, and the melt is ensured to have good fluidity and processability by reaching 350-400 ℃. The cast aluminum heating block of the screw extruder 1 for producing the common Fully Drawn Yarn (FDY) can not meet the use requirement, a ceramic heating tile or a cast copper heating block is adopted, and the spinning box 2 adopts fused salt for heat preservation.
The fluoropolymer in a molten state has strong corrosiveness even if a trace amount of decomposed products are generated, so that the device components in contact with the molten fluoropolymer, namely a screw and a sleeve of the screw extruder 1, a pump seat 3 and a melt pipeline of a metering pump 4, a spinning nozzle 5, a suction device 6 and a spinning shaft 7 are all made of high-temperature-resistant and corrosion-resistant Hardgrove-2000 alloy steel, so that a hydrofluoric acid gas decomposed in the melting process of the fluoropolymer is prevented from corroding the device, and the service life of the device is shortened.
Example 1
The fluorinated ethylene propylene resin slice is used as a raw material, and the fluorinated ethylene propylene fiber is prepared on the device. Feeding the fluorinated ethylene propylene resin slices into a hopper of a screw extruder 1, melting in the screw extruder 1, and extruding from a spinning nozzle 5 through a pump seat 3, a metering pump 4, a pump seat 3 and a melt pipeline to form melt trickle; the melt trickles vertically downwards through a suction device 6, a spinning channel 7 and a oiling wheel 8, passes through a godet wheel 9 in the tangential direction, is wound on a first drawing roller 10 to form nascent fibers, and then is subjected to post-drawing, relaxation heat setting and winding to obtain finished fibers. The generated corrosive gas passes through the suction device 6, is treated, and is discharged.
Wherein the heating area of the screw extruder 1 is divided into three areas, the temperature of the feeding area is 240-260 ℃, the temperature of the compression area is 360-380 ℃, and the temperature of the metering area is 365-385 ℃; the temperature of the spinning nozzle 5 is 365-385 ℃; the rotating speed of the metering pump 4 is 8-10 r/min; the rotating speed of the oil feeding wheel 8 is 10-12 r/min; the temperature of the spinning channel 7 is 60-70 ℃; the temperature of the first stretching roller 10 is 150-170 ℃, and the speed is 100-120 m/min; the temperature of the second stretching roller 11 is 155-175 ℃, and the speed is 220-240 m/min; the temperature of the third drawing roller 12 is 175-185 ℃, and the speed is 210-230 m/min; the temperature of the relaxation heat setting roller 13 is 170-180 ℃, and the speed is 190-210 m/min; the speed of the winder 14 is 185-205 m/min; the speed of the suction device 6 is 0.8-1L/s.
In the embodiment, the aperture of the spinneret plate is 0.8-1 mm, the length-diameter ratio is 10-12: 1, and the prepared fiber has the linear density of 660-700 dtex/24f, the breaking strength of 0.9-1.2 cN/dtex and the elongation at break of 10-15% at the spinning speed of 185-205 m/min. At temperatures below 150 ℃, the fibers exhibit excellent thermal shrinkage resistance (< 1.6%).
Example 2
The fluorinated ethylene propylene resin slice is used as a raw material, and the fluorinated ethylene propylene fiber is prepared on the device. The spinning process was the same as in example 1.
Wherein the screw heating zone is divided into three zones, the temperature of the feeding zone is 250 ℃, the temperature of the compression zone is 370 ℃, and the temperature of the metering zone is 375 ℃; the temperature of the spinneret 5 is 375 ℃; the rotating speed of the metering pump 4 is 8 r/min; the rotating speed of the oil feeding wheel 8 is 10 r/min; the temperature of the spinning channel 7 is 70 ℃; the temperature of the first stretching roller 10 is 160 ℃, and the speed is 100 m/min; the temperature of the second stretching roller 11 is 165 ℃, and the speed is 220 m/min; the temperature of the third drawing roller 12 is 180 ℃, and the speed is 210 m/min; the temperature of the relaxation heat setting roller 13 is 175 ℃, and the speed is 190 m/min; the winder 14 speed is 185 m/min; the speed of the suction device 6 is 1L/s.
In the embodiment, the aperture of the spinneret plate is 1mm, the length-diameter ratio is 10:1, and the prepared fiber has the linear density of 700dtex/24f, the breaking strength of 0.9cN/dtex and the elongation at break of 10 percent at the spinning speed of 210 m/min. At temperatures below 150 ℃, the fibers exhibit excellent thermal shrinkage resistance (< 1.6%).
Example 3
The polyvinylidene fluoride resin slices are used as raw materials, and polyvinylidene fluoride fibers are prepared on the device. The spinning process was the same as in example 1.
Wherein the screw heating zone is divided into three zones, the temperature of the feeding zone is 160-180 ℃, the temperature of the compression zone is 235-255 ℃, and the temperature of the metering zone is 240-260 ℃; the temperature of the spinning nozzle 5 is 240-260 ℃; the rotating speed of the metering pump 4 is 10-12 r/min; the rotating speed of the oil feeding wheel 8 is 10-12 r/min; the temperature of the spinning channel 7 is 50-60 ℃; the temperature of the first stretching roller 10 is 95-110 ℃, and the speed is 150-170 m/min; the temperature of the second stretching roller 11 is 110-130 ℃, and the speed is 410-430 m/min; the temperature of the third drawing roller 12 is 115-135 ℃, and the speed is 420-440 m/min; the temperature of the relaxation heat setting roller 13 is 110-130 ℃, and the speed is 360-380 m/min; the speed of the first winder 14 is 345-365 m/min; the speed of the suction device 6 is 0.8-1L/s.
In the embodiment, the aperture of the spinneret plate is 0.4-0.5 mm, the length-diameter ratio is 3-4: 1, and the prepared fiber has the linear density of 780-820 dtex/70f, the breaking strength of 2.4-2.6 cN/dtex and the elongation at break of 10-15% at the spinning speed of 345-365 m/min. At temperatures below 90 ℃, the fibers exhibit excellent thermal shrinkage resistance (< 2.3%).
Example 4
The polyvinylidene fluoride resin slices are used as raw materials, and polyvinylidene fluoride fibers are prepared on the device. The spinning process was the same as in example 1.
Wherein the screw heating zone is divided into three zones, the temperature of the feeding zone is 170 ℃, the temperature of the compression zone is 245 ℃, and the temperature of the metering zone is 250 ℃; the temperature of the spinneret 5 is 250 ℃; the rotating speed of the metering pump 4 is 11 r/min; the rotating speed of the oil feeding wheel 8 is 12 r/min; the temperature of the spinning channel 7 is 60 ℃; the temperature of the first stretching roller 10 is 95 ℃, and the speed is 150 m/min; the temperature of the second stretching roller 11 is 120 ℃, and the speed is 410 m/min; the temperature of the third stretching roller 12 is 125 ℃, and the speed is 420 m/min; the temperature of the loose heat setting roller 13 is 120 ℃, and the speed is 360 m/min; the winder 14 speed was 345 m/min; the speed of the suction device 6 is 1L/s.
In the embodiment, the aperture of the spinneret plate is 0.5mm, the length-diameter ratio is 3:1, and the prepared fiber has the linear density of 820dtex/70f, the breaking strength of 2.6cN/dtex and the elongation at break of 15 percent at the spinning speed of 300 m/min. At temperatures below 90 ℃, the fibers exhibit excellent thermal shrinkage resistance (< 2.3%).
Nothing in this specification is said to apply to the prior art.
Claims (10)
1. A device for preparing fluoropolymer fully drawn yarn is characterized by comprising a screw extruder, a spinning box, a suction device, a spinning channel, an oil feeding wheel, a godet wheel, a first drawing roller, a second drawing roller, a third drawing roller, a relaxation heat setting roller and a winding machine; a metering pump and a spinning nozzle are integrated in the spinning box;
the tail end of the screw extruder is provided with a spinning box; a suction device is arranged behind a spinning nozzle of the spinning box and is used for sucking and treating corrosive gas generated by the decomposition of the fluorine-containing polymer at high temperature; a spinning channel is arranged behind the suction device; an oil feeding wheel is arranged behind the spinning channel; a godet wheel is arranged behind the oil feeding wheel; a first drawing roller, a second drawing roller and a third drawing roller are sequentially arranged behind the godet wheel and are used for drawing nascent fibers; a relaxation heat setting roller is arranged behind the third stretching roller and is used for controlling shrinkage heat setting of the fibers, reducing the heat shrinkage rate of the fibers, improving the creep resistance of the fibers and strengthening the heat setting effect of the fibers; a winder is arranged behind the loose heat setting roller.
2. The apparatus for producing a fluoropolymer fully drawn yarn according to claim 1, wherein the suction device comprises a suction cylinder, a gas exhaust pipe, a suction pump, and a neutralization treatment tank;
the suction cylinder is of a double-layer hollow cylinder structure consisting of an outer layer and an inner layer, and the outer layer of the suction cylinder is symmetrically provided with two exhaust holes along the circumferential direction of the cylinder body and used for reducing the phenomenon that the melt stream extruded from the spinning nozzle is sucked to one side of the inside of the suction cylinder by the suction pump so that the melt stream is maintained at the central position of the inside of the suction cylinder; the two exhaust holes are respectively communicated with the neutralization treatment tank through respective exhaust pipes, and the exhaust pipes are provided with suction pumps; the inner layer of the suction tube is provided with a plurality of air suction holes.
3. The apparatus for producing a fluorine-containing polymer fully drawn yarn according to claim 2, wherein the diameter of the suction holes is varied in a gradient manner along the circumferential direction of the cylinder, and the diameter of the suction holes is smaller as the suction holes are closer to the exhaust holes, and the diameter of the suction holes is largest at a longitudinal section of the suction cylinder perpendicular to a line connecting the two exhaust holes and is smallest at the exhaust holes, so as to further reduce drift of the melt flow toward a certain side of the inner wall of the suction cylinder.
4. The apparatus for producing a fluorine-containing polymer fully drawn yarn according to claim 1, wherein the rotation speed of the relaxation heat setting roll is lower than that of the third drawing roll and higher than that of the winder.
5. The apparatus for preparing fully drawn fluoropolymer yarn according to claim 1, wherein the diameter of the spinneret orifice of the spinneret plate in the spinneret is 0.3 to 1.2mm, and the aspect ratio of the spinneret orifice is 3 to 12: 1.
6. The apparatus for producing a fluorine-containing polymer fully drawn yarn according to claim 1, wherein the first drawing roll, the second drawing roll, the third drawing roll and the relaxation heat setting roll are arranged in a set of two rolls, the temperature and speed of the two rolls in the set are the same, and the fiber is wound around the two rolls in a reciprocating manner.
7. The apparatus for producing a fluoropolymer fully drawn wire according to claim 6, wherein the axes of the two rolls in one set are not parallel.
8. The apparatus for producing a fluoropolymer fully drawn wire according to claim 1, wherein the member to be brought into contact with the molten fluoropolymer is made of a harderian-2000 alloy material.
9. The apparatus for producing a fluoropolymer fully drawn yarn according to claim 8, wherein the components to be brought into contact with the molten fluoropolymer are a screw and a barrel of a screw extruder, a pump block and a melt pipe of a metering pump, a spinneret, a suction device and a spinning shaft.
10. The apparatus for producing a fluoropolymer fully drawn wire according to claim 1, wherein the screw extruder employs a ceramic heating shoe or a cast copper heating block; the spinning box adopts fused salt for heat preservation.
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| CN202110156051.3A CN112981573A (en) | 2021-02-04 | 2021-02-04 | Preparation facilities of fluoropolymer fully drawn yarn |
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| CN202110156051.3A CN112981573A (en) | 2021-02-04 | 2021-02-04 | Preparation facilities of fluoropolymer fully drawn yarn |
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| CN110055602A (en) * | 2019-05-22 | 2019-07-26 | 江苏太极实业新材料有限公司 | 56 high-tenacity industrial yarn of polyamide and preparation method thereof |
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