CN111441117B - High-strength carbonized flame-retardant yarn - Google Patents
High-strength carbonized flame-retardant yarn Download PDFInfo
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/047—Blended or other yarns or threads containing components made from different materials including aramid fibres
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/36—Cored or coated yarns or threads
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
- D10B2201/20—Cellulose-derived artificial fibres
- D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
- D10B2201/24—Viscose
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
- D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
Abstract
A high-strength carbonized flame-retardant yarn belongs to the technical field of spinning. Uniformly mixing the flame-retardant viscose glue and the aramid fiber 1414; (2) clearing; (3) carding cotton; (4) drawing; (5) roving; (6) spinning; (7) spooling; the flame-retardant viscose, the para-aramid 1414 and the high-strength nylon filament are blended, the production and the processing are carried out according to the blending proportion (mass percentage) of 60 +/-3% of the flame-retardant viscose, 30 +/-3% of the 1414 para-aramid and 10 +/-3% of the high-strength nylon 30-40D filament, and 14 yarns are produced by adopting a core-spun yarn production mode. The flame-retardant fabric produced by the yarn has good flame retardance, no molten drop during carbonization, excellent comfort, high dyeing performance and high strength.
Description
Technical Field
The invention relates to the technical field of spinning, and discloses a high-strength carbonized flame-retardant yarn.
Background
With the improvement of protection consciousness of people, particularly the requirement of individual protection in special industries, a great deal of requirements appear on flame-retardant protective functional clothes, the problems of low strength, itchy wearing, secondary scald caused by melt dripping after combustion, single dyeing and the like appear in the use process of the conventional flame-retardant yarn for producing the protective clothes, and the reasonable matching of fibers with different performances is necessary to be researched and used, the key performances of various fibers are fully utilized, the yarn for producing the protective clothes which has comfortable wearability, high strength, flame retardance and no melt dripping during carbonization is developed, and the requirement of producing the special flame-retardant protective clothes is realized.
Disclosure of Invention
The invention aims to overcome the defect that the existing yarn for producing the flame-retardant protective clothing can not meet various performance requirements of the existing finished clothing, and provides the yarn for the flame-retardant protective clothing, which has good flame retardance, no molten drop during carbonization, excellent comfort, high strength and high dyeing performance, wherein the yarn is produced and processed by blending three fibers, namely flame-retardant viscose, para-aramid 1414, high-strength nylon filament and the like according to the blending proportion of 60 +/-3 percent of the flame-retardant viscose, 30 +/-3 percent of the para-aramid and 10 +/-3 percent of the high-strength nylon filament of 30-40D, and 14 yarns are produced by adopting a core-spun yarn production mode, so that various performance indexes of the blended yarn are improved, and the production requirement of the special flame-retardant protective clothing fabric is met.
The production process flow of the high-strength carbonized flame-retardant yarn comprises the following steps: (1) uniformly mixing the flame-retardant viscose glue and the aramid fiber 1414; (2) clearing; (3) carding cotton; (4) drawing; (5) roving; (6) spinning; (7) and (6) spooling.
Three fibers of flame-retardant viscose, para-aramid 1414 and high-strength nylon filament are blended, so that the high moisture regain performance of the flame-retardant viscose is fully utilized to improve the wearing comfort; the para-aramid 1414 is adopted, the high strength and high flame retardant property of the para-aramid 1414 are utilized, the flame retardant protection function and the applicability of the fabric are guaranteed, the high-strength nylon filaments are adopted as the framework, the yarn strength is improved, and the functional requirements of the special flame retardant protection fabric are met. And a core-spun spinning mode is adopted, so that the yarn strength is further improved. Meanwhile, the yarn count is designed to be 14, and the produced fabric has high air permeability and tear resistance.
The flame-retardant fabric produced by the yarn has good flame retardance, no molten drop during carbonization, excellent comfort, high dyeing property and high strength, and is suitable for various special operation places, in particular to operation places needing good camouflage property.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
The high-strength carbonized flame-retardant yarn has a blending ratio of 60 +/-3% of flame-retardant viscose, 30 +/-3% of 1414 para-aramid and 10 +/-3% of high-strength nylon filament, and the yarn count is 14.
Example 1
Domestic flame-retardant viscose: it is safe and non-toxic, produces no toxic gas during combustion, produces less smoke, has high flame retardance and lasting flame retardant effect, and can maintain the original form after carbonization or at the high temperature of 1100 ℃ to play a role in blocking. The paint does not melt or drip, reduces secondary damage such as scald and the like, and can be degraded after the use life cycle is finished; the dyeing is bright and the color fastness is high.
The main performance indexes of the flame-retardant viscose fiber are as follows:
| linear density of fiber | 2.2dtex | Length of fiber | 51mm |
| Dry breaking strength | ≥2.0CN/dtex | Limiting Oxygen Index (LOI) | ≥35％ |
| Color fastness | Grade not less than 4 | Alkali washability resistance | ≤2％ |
| Duration of combustion | Less than or equal to 2 seconds | Smoldering time | Less than or equal to 2 seconds |
| Density of smoke | Dm4.0≤5 | Composition of flue gas | Is non-toxic |
| Melt dripping | Is free of | Safe ecological index | Class A (OEKO) |
Para-aramid 1414:
the para-aramid 1414 fiber is adopted, and has the characteristics of high strength, high temperature resistance, tearing resistance, flame retardance and the like. The para-aramid fiber 1414 can be continuously used at a high temperature of 220 ℃, the thermal decomposition temperature is more than or equal to 530 ℃, and the domestic para-aramid fiber 1414 has excellent performances in the aspects of sun resistance and water washing resistance.
The main physical indexes of the para-aramid 1414 fibers are as follows:
| linear density of fiber | 2.2dtex | Length of fiber | 51mm |
| Breaking strength of single fiber | ≥14.5CN/dtex | Limiting Oxygen Index (LOI) | ≥28％ |
| Melt dripping | Is free of | Color fastness to washing | 4-5 stages |
| Glass transition temperature | 300℃ | Color fastness to light | 4-5 stages |
| Initial modulus | 85GPA |
High-strength nylon filament:
the high-strength nylon filament has high strength and excellent wear resistance. The main physical indexes of the high-strength nylon fiber are as follows:
| linear density of fiber | 44dtex | Limiting Oxygen Index (LOI) | ≥25％ |
| Breaking strength of single fiber | ≥8.0CN/dtex | Elongation at break | ≥20％ |
The preparation of the high-strength nylon filament comprises the following steps:
1) drying and tackifying: conveying the nylon slices with initial relative viscosity of 2.5-3.0 into a drying tower, and performing countercurrent circulating drying by adopting nitrogen to obtain nylon ultrahigh-viscosity slices with water content of less than or equal to 200ppm and relative viscosity of 3.5-3.8;
2) melt extrusion: conveying the high-viscosity nylon chips into a screw extruder, wherein the temperature of each area of the screw is 285-310 ℃, and melting and extruding the high-viscosity nylon chips;
3) high-pressure spinning: enabling the melt extruded in the step 2) to enter a spinning box through a melt pipeline with the temperature of 280-295 ℃, quantitatively pressing the melt into a spinning assembly through a metering pump, and spraying the melt from a spinneret plate to form tows; the speed of the filament bundle is 5-10 m/min;
4) and (3) cooling and forming: the melt trickle sprayed after spinning is slowly cooled and then is cooled by side blowing to form a nascent fiber tow;
5) oiling and bundling: oiling the cooled filament bundles by using an oil tanker, wherein the oiling mode is emulsion oiling, and the oiling rate is controlled to be 1.0-1.3%;
6) stretching and shaping: carrying out stretching and shaping treatment on the bunched and oiled tows; the method comprises the following steps of stretching, wherein a group of feeding rollers is adopted for natural stretching, four pairs of hot rollers are adopted for two-stage hot stretching and one-stage relaxation heat setting, the total stretching multiple is 2.5-3.5, the orientation degree of the tows in the early stage is improved by improving the natural stretching ratio, and then two-stage hot stretching is adopted for continuously orienting the macromolecules of the tows, so that higher strength is obtained;
further preferably: the feeding roller is not heated, the natural draw ratio is more than or equal to 200, and the feeding roller is mainly used for pre-orienting the tows sprayed by the spinneret plate in a viscous state, so that the subsequent draw ratio is reduced, and the generation of subsequent drawn broken filaments is reduced; the speed difference between the feeding roller and the first group of hot rollers plays a role in tensioning the slivers, and the speed ratio is 1.02-1.06; the first group of hot rollers are 40-70 ℃, the second group of hot rollers are 150-190 ℃, the first-step stretching is carried out between the second group of hot rollers and the first group of hot rollers, the speed ratio is 1.6-2.5, the first group of hot rollers and the second group of hot rollers mainly function in heating the tows to the vitrification temperature, so that macromolecules have motion conditions, and molecular chains are arranged along the stretching direction; the third group of hot rollers is 200-250 ℃, the second-step stretching is carried out between the third group of hot rollers and the second group of hot rollers, the speed ratio is 1.2-1.8 times, the second-step stretching mainly has the effect of making up the deficiency of the first-step stretching, so that hydrogen bonds among macromolecules are weakened or disappear, the macromolecules are further oriented, and the strand silk reaches the highest strength; the temperature of the fourth group of hot rollers is 170-200 ℃, the tows are subjected to relaxation heat setting between the fourth group of hot rollers and the third group of hot rollers, the speed ratio is 0.95-0.98, and the fourth group of hot rollers are used for performing relaxation setting on the tows, so that the crystallinity of the tows is improved, and the precursor with a more stable molecular structure is obtained.
7) Winding: and (3) fully automatically winding the tows subjected to the stretching and setting treatment, setting the winding speed to 5200-5800 m/min, and winding to obtain the fine denier high-strength nylon fiber.
The preparation process of the high-strength carbonized flame-retardant yarn comprises the following steps:
1. the control key points of the fiber mixing in the production process are as follows:
the spun yarn is composed of three components of fibers, wherein aramid fibers are high in rigidity and poor in cohesive property with viscose in the production process, and are not beneficial to normal production, so that pretreatment of an oiling agent and an antistatic agent is performed before the spun yarn is used for 24 hours, a mixed reagent is prepared by adopting 2% of an oiling agent and 4% of the antistatic agent and water, the mixed reagent accounts for 10% of the total weight of the fibers, is uniformly sprayed on the surfaces of the fibers, and is used for 24 hours in advance.
Mixing the flame-retardant viscose and the pretreated aramid fiber in a cotton tank according to the proportion of 60/30, wherein the mixing uniformity determines the yarn quality and the comprehensive performance of the final garment material, and all fibers must be fully mixed to ensure the yarn uniformity and consistency; the blowing and carding process adopts a low-speed and light-weight process route to fully mix the single-fiber fibers.
2. Opening and picking process
Because the fibers have no impurities, the opening is important, the distance between the beater and the dust rod is shortened, the beater speed is reduced, and the distance between the dust rods is closed.
The opening and picking process adopts coiling equipment, an A002D type bale plucker, and the main process parameters are as follows: the beater speed is 900r/min, and the operating efficiency of the bale plucker is 95 percent. A036C type beater adopts a card wire beater, the gauge is 10cm, the beater rotating speed is 360r/min, the cotton feeding roller rotating speed is determined to be 70r/min according to the operating efficiency so as to ensure more and less beating, and the beater speed of A076C is 750 r/min. The ration of the cotton roll is 350g/m, the length of the cotton roll is 30m, and the elongation of the cotton roll is 1.0%.
3. Carding process
This process used a model a186F low speed carding machine. The configuration of the card clothing is the focus: the cylinder card clothing adopts model 1830 × 1650D with low tooth root density, and model 4030 × 1890 with high transfer performance is selected by doffer. The cover plate is made of a JP520 type with high tooth density.
The technological configuration adopts large-spacing, low-speed and light-weight. The main process configuration is as follows: the cylinder-cover plate gauge is 14mm, 12mm and 14 mm. The cylinder speed is 300r/min, and the licker-in speed is 550 r/min.
4. Drawing process
Drawing adopts FA306 type, and the roller gauge and drafting distribution are controlled in emphasis. The first passage adopts 6 pieces of combination, the total draft multiple is 5.8 times, the back zone draft is 1.8 times, the draft ratio is 3.22, and the roller gauge is 28 multiplied by 40 mm; the roller speed is 238 m/min; the final drawing uses 8-ply drawing, the total draft multiple is 8.82 times, the back zone draft is 1.25 times, the draft ratio is 7.1, the roller gauge is 23X 40mm, and the roller speed is 220 m/min. The head and tail pressures were all adjusted to maximum. The drawing process relative humidity is controlled at 68%. The drawing roller is used after 2 times of treatment by using A, B component coating.
5. Roving process
The roving adopts an FA426 roving machine, and the roving process adopts a two-large two-small process, namely a process principle of large pressure, large gauge, low speed and small ration, so as to be beneficial to the evenness of the roving. The roving process is well controlled in elongation, the elongation is required to be controlled within the range of 1.5 +/-0.5%, and the difference between front and rear rows and the size of yarns is within the range of 0.5%. The main technological parameters of the roving are as follows: cradle pressure 240 × 220 × 200N, roller gauge 35 × 50mm, nip gauge 8.0mm, roving twist factor 82, spindle speed 750 r/min.
6. Spinning process
The spun yarn adopts an FA506 spinning machine, and is wrapped on the high-strength nylon filament by using the modified covering yarn device and the mixed roving of the flame-retardant viscose and the aramid fiber. The key point of the spinning process control lies in the coating effect of the short fibers and the long fibers, and the short fibers are uniformly covered on the outer surface of the long fibers and are twisted and formed. The specific process is that the ingot speed is 14500rpm, the back zone draft multiple is 1.21 times, the roller gauge is 30 multiplied by 48, the jaw gauge is 5.5mm, and the twist factor is 390. Equipment is provided with: adopting a 68-degree medium-hardness rubber roller; a water droplet type pressure bar; the rolling and twisting part is a titanium alloy steel collar PG14254 with strong self-lubricating function, and the traveller is a high-arch chromium-plated traveller.
7. Winding process machine
By adopting an automatic winder of German Schleifford company AC338RM, the configuration of the winding process is mainly the selection of an electric cleaning process: n350%, S160%. times.2.0 cm, L35%. times.50 cm, T35%. times.80 cm. The spooling speed is 1000 m/min.
The main properties of the finished yarn are shown in Table 1.
| Variety of (IV) C | Flame-retardant viscose/aramid 1414/high-strength chinlon 14S |
| Coefficient of variation by weight of hectometer CV% | 2.0 |
| Actual dry weight (g/100 m) | 3.900 |
| Weight deviation of one hundred meters (%) | 1.0 |
| Actual figure (special) | 42.0 |
| Moisture regain (%) | 7.8 |
| Single yarn breaking strength (cN/tex) | 22.8 |
| Correction strength (cN) | 963.5 |
| Single strong coefficient of variation CV% | 7.4 |
| Yarn cv | 9.45 |
| Details of | 0 |
| Nub | 8 |
| Cotton knots | 12 |
| Lowest strength | 854.3 |
| Twist factor | 387 |
Table 1: main properties of finished yarn
A high-strength carbonized flame-retardant yarn is used for weaving 14-count high-wearability flame-retardant gray fabric with 60% of flame-retardant viscose, 30% of 1414 para-aramid and 10% of nylon filament. The gray fabric has the advantages that the combustion performance of the gray fabric reaches the standard flame-retardant A level of GB 17591-2006 flame-retardant woven fabric, the gray fabric is completely carbonized without melting or dripping during combustion, and the physical index exceeds the excellent level of GB/T406-2008, so that the gray fabric can be used by special operation tools for fire fighting, military and the like with strong force.
Claims (1)
1. The application of the high-strength carbonized flame-retardant yarn is used in the working place with camouflage performance, and the preparation method of the high-strength carbonized flame-retardant yarn comprises the following steps: blending three fibers of flame-retardant viscose, para-aramid 1414 and high-strength nylon filament, producing and processing according to the blending proportion (mass percentage) of 60 +/-3% of flame-retardant viscose, 30 +/-3% of 1414 para-aramid and 10 +/-3% of high-strength nylon 30-40D filament, and producing 14 yarns by adopting a covering yarn production mode; the method specifically comprises the following steps:
(1) preprocessing a oiling agent and an antistatic agent by para-aramid 1414 before using for 24 hours, preparing a mixed reagent by adopting 2% of an oiling agent, 4% of the antistatic agent and water, uniformly spraying the mixed reagent accounting for 10% of the total weight of the fiber on the surface of the fiber, and using after presetting for 24 hours;
(2) mixing the flame-retardant viscose and the pretreated aramid in a cotton tank to fully mix the fibers; the blowing and carding process adopts a low-speed and light-weight process route to fully mix single-fiber fibers;
(3) opening and picking: shortening the distance between the beater and the dust rod, reducing the beater speed, and closing the distance between the dust rods; so that the ration of the cotton roll is 350g/m, the length of the cotton roll is 30m, and the elongation of the cotton roll is 1.0 percent;
(4) and cotton carding process: A186F type low-speed carding machine is adopted, cylinder card clothing adopts model 1830 × 1650D with low tooth root density, doffer adopts model 4030 × 1890 with high transfer performance, and cover plate adopts JP520 with high tooth density; the cylinder-cover plate gauge is 14mm, 12mm and 14 mm; the cylinder speed is 300r/min, and the licker-in speed is 550 r/min;
(5) drawing: drawing adopts FA306 type, the first pass adopts 6 pieces of combination, the total draft multiple is 5.8 times, the back zone draft is 1.8 times, the draft ratio is 3.22, and the roller gauge is 28 multiplied by 40 mm; the roller speed is 238 m/min; the final drawing uses 8 pieces of doubling, the total draft multiple is 8.82 times, the back zone draft is 1.25 times, the draft ratio is 7.1, the roller gauge is 23 multiplied by 40mm, and the roller speed is 220 m/min; the head and tail pressure are adjusted to the maximum; the relative humidity of the drawing process is controlled at 68 percent; the drawing roller is used after being treated for 2 times by using A, B component paint;
(6) roving: the roving process is suitable for adopting a 'two-large two-small' process, namely, a process principle of 'large pressure, large gauge, low speed and small ration' so as to be beneficial to uniform roving evenness; the roving process is characterized in that the elongation is well controlled, the elongation is required to be controlled within the range of 1.5 +/-0.5%, and the difference between front and rear rows and the size of yarns is within the range of 0.5%;
(7) spinning: wrapping the high-strength nylon filament yarn with a mixed roving of flame-retardant viscose and aramid; the key point of the spinning process is that the short fibers are uniformly covered on the surface of the filament and are twisted to form; the ingot speed is 14500rpm, the back zone draft multiple is 1.21 times, the roller gauge is 30 multiplied by 48, the jaw gauge is 5.5mm, and the twist factor is 390;
(8) a spooling process: adopting German Cinefu company AC338RM automatic winder, the electric cleaning process is selected as follows: n350%, S160% x 2.0cm, L35% x 50cm, T35% x 80cm, and spooling speed 1000 m/min;
in the spinning step (7), the high-strength nylon filament is prepared by the following method:
7-1) drying and tackifying: conveying the nylon slices with initial relative viscosity of 2.5-3.0 into a drying tower, and performing countercurrent circulating drying by adopting nitrogen to obtain nylon ultrahigh-viscosity slices with water content of less than or equal to 200ppm and relative viscosity of 3.5-3.8;
7-2) melt extrusion: conveying the high-viscosity nylon chips into a screw extruder, wherein the temperature of each area of the screw is 285-310 ℃, and melting and extruding the high-viscosity nylon chips;
7-3) high-pressure spinning: enabling the melt extruded in the step 2) to enter a spinning box through a melt pipeline with the temperature of 280-295 ℃, quantitatively pressing the melt into a spinning assembly through a metering pump, and spraying the melt from a spinneret plate to form tows; the speed of the filament bundle is 5-10 m/min;
7-4) cooling and forming: the melt trickle sprayed after spinning is slowly cooled and then is cooled by side blowing to form a nascent fiber tow;
7-5) oiling and bundling: oiling the cooled filament bundles by using an oil tanker, wherein the oiling mode is emulsion oiling, and the oiling rate is controlled to be 1.0-1.3%;
7-6) stretching and shaping: carrying out stretching and shaping treatment on the bunched and oiled tows; the feeding roller is not heated, the natural draw ratio is more than or equal to 200, and the feeding roller is mainly used for pre-orienting the tows sprayed by the spinneret plate in a viscous state, so that the subsequent draw ratio is reduced, and the generation of subsequent drawn broken filaments is reduced; the speed difference between the feeding roller and the first group of hot rollers plays a role in tensioning the slivers, and the speed ratio is 1.02-1.06; the first group of hot rollers are 40-70 ℃, the second group of hot rollers are 150-190 ℃, the first-step stretching is carried out between the second group of hot rollers and the first group of hot rollers, the speed ratio is 1.6-2.5, the first group of hot rollers and the second group of hot rollers mainly function in heating the tows to the vitrification temperature, so that macromolecules have motion conditions, and molecular chains are arranged along the stretching direction; the third group of hot rollers is 200-250 ℃, the second-step stretching is carried out between the third group of hot rollers and the second group of hot rollers, the speed ratio is 1.2-1.8 times, the second-step stretching mainly has the effect of making up the deficiency of the first-step stretching, so that hydrogen bonds among macromolecules are weakened or disappear, the macromolecules are further oriented, and the strand silk reaches the highest strength; the temperature of the fourth group of hot rollers is 170-200 ℃, the tows are subjected to relaxation heat setting between the fourth group of hot rollers and the third group of hot rollers, the speed ratio is 0.95-0.98, and the fourth group of hot rollers are used for performing relaxation setting on the tows, so that the crystallinity of the tows is improved, and the precursor with a more stable molecular structure is obtained;
7) winding: fully automatically winding the tows subjected to the stretching and setting treatment at a winding speed of 5200-5800 m/min to obtain fine denier high-strength nylon fibers;
the performance indexes of the flame-retardant viscose fiber are as follows:
the physical indexes of the para-aramid 1414 fibers are as follows:
High-strength nylon filament:
the high-strength nylon filament has high strength and excellent wear resistance; the main physical indexes of the high-strength nylon fiber are as follows:
。
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| CN112267190A (en) * | 2020-10-21 | 2021-01-26 | 南通神马线业有限公司 | Novel high-comfort flame-retardant yarn |
| CN114622318A (en) * | 2020-12-14 | 2022-06-14 | 无锡高仕康新材料科技有限公司 | Preparation method of long fiber high-strength yarn |
| CN114517352A (en) * | 2021-12-31 | 2022-05-20 | 浙江多元纺织科技(集团)有限公司 | Method for manufacturing multi-component blended flame-retardant oil-proof camouflage fabric |
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