CN116043383A - Elastic yarn and preparation method thereof - Google Patents
Elastic yarn and preparation method thereof Download PDFInfo
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- CN116043383A CN116043383A CN202310067176.8A CN202310067176A CN116043383A CN 116043383 A CN116043383 A CN 116043383A CN 202310067176 A CN202310067176 A CN 202310067176A CN 116043383 A CN116043383 A CN 116043383A
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229920000642 polymer Polymers 0.000 claims abstract description 82
- 239000000835 fiber Substances 0.000 claims abstract description 57
- 229920002334 Spandex Polymers 0.000 claims abstract description 35
- 239000004759 spandex Substances 0.000 claims abstract description 35
- 229920000098 polyolefin Polymers 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000155 melt Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000009987 spinning Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 206010020112 Hirsutism Diseases 0.000 abstract description 4
- 210000004177 elastic tissue Anatomy 0.000 abstract description 4
- 241001391944 Commicarpus scandens Species 0.000 abstract description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
- D02G3/328—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic containing elastane
-
- 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
-
- 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
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
-
- 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
- D10B2331/10—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention discloses an elastic yarn and a preparation method thereof, wherein the elastic yarn comprises at least one parallel double-component fiber filament and at least one spandex filament which are twisted in parallel, the parallel double-component fiber filament comprises a polymer A and a polymer A, the polymer A and the polymer A are similar polyolefin materials, the melt indexes of the polymer A and the polymer A differ by more than 10, and the mass ratio of the polymer A to the polymer A is 1 (0.1-5). The parallel bicomponent fiber filaments and spandex filaments are not easy to generate hairiness, entanglement and the like in the interweaving process, and the obtained elastic fiber has high strength and good elasticity; the twisted yarn obtained by twisting the parallel double-component fiber filaments and the spandex filaments is similar to the common twisted yarn in morphology, and has good processability; in the stretch-excited elastic yarn, spandex is in a cross-twisted state, a silk loop formed by stretching and curling fibers can be fixed, the silk loop is firm and not easy to break off, and the strength is high.
Description
Technical Field
The invention relates to the technical field of yarn filaments, in particular to an elastic yarn and a preparation method thereof.
Background
Spandex is an elastic fiber filament, has excellent elasticity and recovery performance, and is deeply favored by consumers. Spandex is often not used directly, but is often processed with other materials into elastic yarns with good stretch, elastic recovery, and loft.
The knitted and woven fabric prepared from the elastic yarns has the effects of comfort, beautiful appearance, warmth retention and the like. The traditional elastic yarn mainly comprises core spun yarn, cladding yarn and wrapping yarn, and has good application market. However, the existing elastic yarn has a complex preparation mode, and when the elastic yarn is used for preparing products such as knitting and woven fabrics, the elastic yarn has low strength and poor elasticity due to the characteristics of the structure, the elasticity and the like of the elastic yarn, the hairiness, the entanglement and the like easily occur due to friction in the interweaving process, and the problems of elasticity loss, strength loss and the like of the yarn are further caused.
Disclosure of Invention
The invention aims to provide an elastic yarn and a preparation method thereof, and the obtained elastic yarn has high strength and good elasticity.
The invention provides an elastic yarn, which comprises at least one parallel bicomponent fiber filament and at least one spandex filament which are twisted in parallel, wherein the parallel bicomponent fiber filament comprises a polymer A and a polymer A, the polymer A and the polymer A are similar polyolefin materials, the melt indexes of the polymer A and the polymer A differ by more than 10, and the mass ratio of the polymer A to the polymer A is 1 (0.1-5).
Preferably, the diameter of the side-by-side bicomponent fiber filaments is 12 μm to 30 μm.
Preferably, the specification of the spandex filaments is distributed between 20 and 140D.
Preferably, the polyolefin material comprises one of polypropylene (PP), polyethylene (PE), polyamide (PA), polyester (PET).
Preferably, the melt index of the polymer a is 20-40, and the melt index of the polymer a is 30-100.
The invention also provides a preparation method of the elastic yarn, which comprises the following steps:
(1) Preparing the side-by-side bicomponent fiber filaments:
respectively feeding the polymer A and the polymer A into barrels on two sides of a spunbonding machine, and setting the temperature of a front zone at 210 ℃, the temperature of a rear zone and the temperature of a spinneret at 230 ℃;
the polymer A and the polymer A sequentially pass through a screw extruder, a metering pump and a yarn dividing plate from a charging barrel, then are converged at a yarn spraying hole, and are drawn and wound on the barrel to obtain parallel bicomponent fiber filaments;
(2) Preparing the elastic yarn:
and selecting parallel bicomponent fiber filaments and spandex filaments with the specification of 20-140D for doubling, and placing the doubled filaments into a doubling and twisting combination machine for parallel twisting to obtain the stretch-excited elastic yarn.
Preferably, in the step (1), the extrusion speed is 0.1-0.5g/h/min, and the spinning speed is 50-100m/min.
Preferably, in the step (2), the number of the parallel bicomponent fiber filaments is 2-10, and the number of the spandex filaments is 1-3.
Preferably, in the step (2), the twist of the elastic yarn is 80-200 twists/10 cm.
Preferably, in the step (2), the specification of the spandex filament is distributed in 20-140D.
Compared with the prior art, the invention has the advantages and positive effects that: the invention provides an elastic yarn and a preparation method thereof, wherein the elastic yarn comprises at least one parallel double-component fiber filament and at least one spandex filament which are twisted in parallel, the parallel double-component fiber filament comprises a polymer A and a polymer A, the polymer A and the polymer A are similar polyolefin materials, the melt indexes of the polymer A and the polymer A differ by more than 10, and the mass ratio of the polymer A to the polymer A is 1 (0.1-5). (1) The elastic yarn prepared by the method has good mechanical properties, and the prepared elastic yarn also has good mechanical properties; the parallel bicomponent fiber filaments and spandex filaments are not easy to generate hairiness, entanglement and the like in the interweaving process, and the obtained elastic fiber has high strength and good elasticity; (2) The twisted yarn obtained by twisting the parallel double-component fiber filaments and the spandex filaments is similar to the common twisted yarn in shape, can be subjected to a common weaving process and has good processability; (3) In the stretch-excited elastic yarn, spandex is in a cross-twisted state, a silk loop formed by stretching and curling fibers can be fixed, the silk loop is firm and not easy to break off, and the strength is high; (4) The elastic yarn excited by stretching has the excellent characteristics of good ductility, elasticity, acid and alkali resistance, sweat resistance and the like, and has soft hand feeling.
Drawings
FIG. 1 is a schematic diagram of an elastic yarn obtained by cabling side-by-side bicomponent fiber filaments with spandex;
FIG. 2 is a schematic structural view of a stretch crimped elastic yarn;
reference numerals: 1 spandex filament; 2 juxtaposing bicomponent fiber filaments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
The elastic yarn comprises at least one parallel double-component fiber filament and at least one spandex filament which are twisted in parallel, wherein the parallel double-component fiber filament comprises a polymer A and a polymer A, the polymer A and the polymer A are similar polyolefin materials, the melt indexes of the polymer A and the polymer A differ by more than 10, and the mass ratio of the polymer A to the polymer A is 1 (0.1-5).
The polymer A and the polymer A are similar polyolefin, have high similarity, and are not easy to open in the subsequent processing process; because the similar polyolefin has extremely low moisture regain, the polyolefin does not need to be dried before being used.
The parallel double-component fiber filament is prepared from two polyolefins with different melt indexes, wherein the melt indexes of the polymer A and the polymer A are different by more than 10, the polyolefin with different melt indexes is distributed on two sides of each filament, and the polyolefin shrinkage rate of the polyolefin with different melt indexes is different in the cooling and drawing process due to the different melt indexes of the polyolefin on two sides of each filament, so that the filaments generate obvious curling, and the prepared parallel double-component fiber filament has the characteristics of three-dimensional curling, high elasticity, high bulk, high filtration efficiency, high porosity and the like.
The polyolefin material comprises one of polypropylene (PP), polyethylene (PE), polyamide (PA) and Polyester (PET).
The diameter of the parallel double-component fiber filament is 12-30 mu m, and the fiber filament has the characteristics of three-dimensional curling, high elasticity, high bulk, high filtration efficiency, high porosity and the like after being stretched.
The fineness specification of the spandex filaments is distributed in 20-140D, so that the prepared parallel bicomponent fiber filaments have the characteristics of three-dimensional crimping, high elasticity, high bulk and the like.
The melt index of the polymer A is 20-40, the melt index of the polymer A is 30-100, and the polyolefin shrinkage of different melt indexes is also different in the cooling and drawing process, so that the filament is obviously curled, and the prepared parallel bicomponent fiber filament has the characteristics of three-dimensional curling, high elasticity, high bulk and the like.
The preparation method of the elastic yarn comprises the following steps:
(1) Preparing a side-by-side bicomponent fiber filament:
respectively feeding a polymer A and a polymer A into barrels on two sides of a spunbonding machine, setting the temperature of a front region at 210 ℃, the temperature of a rear region and the temperature of a spinneret at 230 ℃, and the extrusion speed at 0.1-0.5g/h/min and the spinning speed at 50-100m/min;
sequentially passing the polymer A and the polymer A through a screw extruder, a metering pump and a yarn dividing plate from a charging barrel, converging at a yarn spraying hole, and drawing and winding the materials on the barrel to obtain parallel bicomponent fiber filaments;
(2) Preparing the elastic yarn:
2-10 parallel bicomponent fiber filaments and 1-3 spandex filaments with the specification of 20-50D are selected for doubling, the doubling is placed in a doubling and twisting combination machine for parallel twisting, and the elastic yarn excited by stretching is obtained, wherein the twist of the elastic yarn is 80-200 twists/10 cm.
The invention has the advantages and positive effects that:
(1) The elastic yarn prepared by the method has good mechanical properties, and the prepared elastic yarn also has good mechanical properties; the parallel bicomponent fiber filaments and spandex filaments are not easy to generate hairiness, entanglement and the like in the interweaving process, and the obtained elastic fiber has high strength and good elasticity;
(2) The twisted yarn obtained by twisting the parallel double-component fiber filaments and the spandex filaments is similar to the common twisted yarn in shape, can be subjected to a common weaving process and has good processability;
(3) In the stretch-excited elastic yarn, spandex is in a cross-twisted state, a silk loop formed by stretching and curling fibers can be fixed, the silk loop is firm and not easy to break off, and the strength is high;
(4) The elastic yarn excited by stretching has the excellent characteristics of good ductility, elasticity, acid and alkali resistance, sweat resistance and the like, and has soft hand feeling.
Example 1
(1) Preparing a side-by-side bicomponent fiber filament:
respectively feeding a polymer A and a polymer A into barrels on two sides of a spunbonding machine, setting the temperature of a front region at 210 ℃, the temperature of a rear region and the temperature of a spinneret at 230 ℃, and the extrusion speed at 0.1-0.5g/h/min and the spinning speed at 50-100m/min;
the polymer A and the polymer A sequentially pass through a screw extruder, a metering pump and a yarn dividing plate from a charging barrel, then are converged at a yarn spraying hole, and are drawn and wound on the barrel to obtain the parallel bi-component fiber filament.
(2) Preparing elastic yarns:
2-10 parallel bicomponent fiber filaments and 1-3 spandex filaments with the specification of 20-50D are selected for doubling; doubling and twisting the doubling and twisting in a doubling and twisting combination machine to obtain elastic yarn after doubling and twisting; and (3) stretching the two ends of the twisted elastic yarn to increase the length of the yarn by 2-5 times to obtain the stretched and curled elastic yarn, wherein the twist of the stretched and curled elastic yarn is 80-150 twists/10 cm.
FIG. 1 is a schematic structural view of an elastic yarn obtained by cabling side-by-side bicomponent fiber filaments with spandex, the elastic yarn at this time not yet having elasticity;
FIG. 2 is a schematic drawing of a drawn and crimped elastic yarn, wherein the side-by-side bicomponent fibers in the yarn are elongated and crimped to achieve elastic properties, and the drawn yarn is endowed with good extensibility and elasticity and soft hand feel.
Example 2
(1) Preparing a side-by-side bicomponent fiber filament:
respectively feeding a polymer A and a polymer A into barrels on two sides of a spunbonding machine, setting the temperature of a front region at 210 ℃, the temperature of a rear region and the temperature of a spinneret at 230 ℃, and the extrusion speed at 0.5-1g/h/min and the spinning speed at 100-150m/min;
the polymer A and the polymer A sequentially pass through a screw extruder, a metering pump, a yarn dividing plate and a yarn spraying hole from a charging barrel, and are drawn and wound on the barrel to obtain the parallel bicomponent fiber filament.
(2) Preparing elastic yarns:
2-10 parallel bicomponent fiber filaments and 1-2 spandex filaments with the specification of 50-70D are selected for doubling; doubling and twisting the doubling and twisting in a doubling and twisting combination machine to obtain elastic yarn after doubling and twisting; and (3) stretching the two ends of the twisted elastic yarn to increase the length of the yarn by 2-5 times to obtain the stretched and curled elastic yarn, wherein the twist of the stretched and curled elastic yarn is 100-180 twists/10 cm.
Example 3
(1) Preparing a side-by-side bicomponent fiber filament:
respectively feeding polymer A and polymer A into barrels on two sides of a spunbonding machine, setting the temperature of a front zone at 210 ℃, the temperature of a rear zone at 230 ℃ and the spinning speed at 150-200m/min, wherein the extrusion speed is 1-1.5 g/h/min.
The polymer A and the polymer A sequentially pass through a screw extruder, a metering pump, a yarn dividing plate and a yarn spraying hole from a charging barrel, and are drawn and wound on the barrel to obtain the parallel bicomponent fiber filament.
(2) Preparing elastic yarns:
2-10 parallel bicomponent fiber filaments and 1-2 spandex filaments with the specification of 70-100D are selected for doubling; doubling and twisting the doubling and twisting in a doubling and twisting combination machine to obtain elastic yarn after doubling and twisting; and (3) stretching the two ends of the twisted elastic yarn to increase the length of the yarn by 2-5 times to obtain the stretched and curled elastic yarn, wherein the twist of the stretched and curled elastic yarn is 120-160 twists/10 cm.
Example 4
(1) Preparation of side-by-side bicomponent fiber filaments:
respectively feeding polymer A and polymer A into two side barrels of a spunbonding machine, setting the temperature of a front zone at 210 ℃, the temperature of a rear zone at 230 ℃ and the spinning speed at 200-300m/min, wherein the extrusion speed is 1.5-2 g/h/min.
The polymer A and the polymer A sequentially pass through a screw extruder, a metering pump, a yarn dividing plate and a yarn spraying hole from a charging barrel, and are drawn and wound on the barrel to obtain the parallel bicomponent fiber filament.
(2) Preparing elastic yarns:
2-10 parallel bicomponent fiber filaments and 1-2 spandex filaments with the specification of 100-140D are selected for doubling; doubling and twisting the doubling and twisting in a doubling and twisting combination machine to obtain elastic yarn after doubling and twisting; and (3) stretching the two ends of the twisted elastic yarn to increase the length of the yarn by 2-5 times to obtain the stretched and curled elastic yarn, wherein the twist of the stretched and curled elastic yarn is 120-150 twists/10 cm.
Example 5
(1) Preparing a side-by-side bicomponent fiber filament:
respectively feeding polymer A and polymer A into two side barrels of a spunbonding machine, setting the temperature of a front zone at 190 ℃, the temperature of a rear zone and the temperature of a spinneret at 210 ℃, and the extrusion speed at 0.2-1g/h/min and the spinning speed at 100-200m/min.
The polymer A and the polymer A sequentially pass through a screw extruder, a metering pump, a yarn dividing plate and a yarn spraying hole from a charging barrel, and are drawn and wound on the barrel to obtain the parallel bicomponent fiber filament.
(2) Preparing elastic yarns:
selecting 5-20 parallel bicomponent fiber filaments and 1-2 spandex filaments with the specification of 20-100D for doubling; doubling and twisting the doubling and twisting in a doubling and twisting combination machine to obtain elastic yarn after doubling and twisting; and (3) stretching the two ends of the twisted elastic yarn to increase the length of the yarn by 2-5 times to obtain the stretched and curled elastic yarn, wherein the twist of the stretched and curled elastic yarn is 80-120 twists/10 cm.
The elastic yarns of example 1, example 2, example 3, example 4 and example 5 were tested accordingly, with a grip distance of 50mm, with reference to the standard: ASTMD2731-2001 Standard test method for elastic yarn elasticity (CRE tensile tester), and the test results are shown in Table 1. As can be seen from table 1, the yarn of the present invention has good elasticity and ductility, which are greatly affected by yarn twist and spandex fineness.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Elongation/mm | 190.5±9 | 186.5±15.5 | 175±12.5 | 189.5±14.5 | 199.5±11 |
| Elongation/% | 3.81±0.18 | 3.73±0.31 | 3.5±0.25 | 3.79±0.29 | 3.99±0.22 |
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. An elastic yarn comprising
At least one parallel double-component fiber filament and at least one spandex filament are twisted in parallel,
the juxtaposition bicomponent fiber filament comprises a polymer A and a polymer A, wherein the polymer A and the polymer A are similar polyolefin materials, the melt indexes of the polymer A and the polymer A differ by more than 10, and the mass ratio of the polymer A to the polymer A is 1 (0.1-5).
2. An elastic yarn as claimed in claim 1, wherein,
the diameter of the parallel bicomponent fiber filaments is 12-30 μm.
3. An elastic yarn as claimed in claim 1, wherein,
the specification of the spandex filament is distributed in 20-140D.
4. An elastic yarn as claimed in claim 1, wherein,
the polyolefin material comprises one of polypropylene (PP), polyethylene (PE), polyamide (PA) and Polyester (PET).
5. An elastic yarn as claimed in claim 1, wherein,
the melt index of the polymer A is 20-40, and the melt index of the polymer A is 30-100.
6. The method of producing an elastic yarn according to any one of claims 1 to 5, comprising:
(1) Preparing the side-by-side bicomponent fiber filaments:
respectively feeding the polymer A and the polymer A into barrels on two sides of a spunbonding machine, and setting the temperature of a front zone at 210 ℃, the temperature of a rear zone and the temperature of a spinneret at 230 ℃;
the polymer A and the polymer A sequentially pass through a screw extruder, a metering pump and a yarn dividing plate from a charging barrel, then are converged at a yarn spraying hole, and are drawn and wound on the barrel to obtain parallel bicomponent fiber filaments;
(2) Preparing the elastic yarn:
and selecting parallel bicomponent fiber filaments and spandex filaments with the specification of 20-140D for doubling, and placing the doubled filaments into a doubling and twisting combination machine for parallel twisting to obtain the stretch-excited elastic yarn.
7. The method of producing elastic yarn according to claim 6, wherein,
in the step (1), the extrusion speed is 0.1-0.5g/h/min, and the spinning speed is 50-100m/min.
8. The method of producing elastic yarn according to claim 6, wherein,
in the step (2), the number of the parallel bicomponent fiber filaments is 2-10, and the number of the spandex filaments is 1-3.
9. The method of producing elastic yarn according to claim 6, wherein,
in the step (2), the twist of the elastic yarn is 80-200 twists/10 cm.
10. The method of producing elastic yarn according to claim 6, wherein,
in the step (2), the specification of the spandex filaments is distributed in 20-140D.
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