Spinning apparatus, spinning method, and yarn fabric for jet vortex spinning of elastic core-spun yarn

Abstract

This invention belongs to the technical field of textile spinning, specifically relating to a spinning apparatus, spinning method, and yarn fabric for air-jet vortex spinning of elastic core-spun yarn. This invention provides a spinning method for air-jet vortex spinning of elastic core-spun yarn, which is low-cost, highly efficient, less prone to breakage, and produces a woven fabric with high elongation and elastic recovery. The spinning method of this invention involves: two elastic filaments, or one elastic filament and one non-elastic filament, undergoing tension pre-adjustment and air jet pre-stretching to form a double-core yarn. This double-core yarn is then fed into the front roller nip of the air-jet vortex spinning drafting zone via a yarn guide at the core-spun yarn device. The fiber sheath, after being spun into a mature sliver in the previous spinning process, passes sequentially through a bell-mouth guide and the drafting zone, where it merges with the double-core yarn at the front roller nip of the air-jet vortex spinning drafting zone and is drawn into a nozzle, forming air-jet vortex spun elastic core-spun yarn under the action of airflow. This invention also provides a spinning apparatus.

Description

Technical Field

[0001] This invention belongs to the technical field of textile spinning, specifically relating to a spinning device, spinning method, and yarn fabric for jet vortex spinning of elastic core-spun yarn. Background Technology

[0002] With the improvement of people's living standards and quality of life, textiles with good elasticity and durability are highly favored and widely used in sports and leisure fields. Elastic fibers are an important raw material for the production of elastic fabrics. At present, there are many types of elastic fibers, mainly divided into polyurethane fibers (such as spandex), polyether ester elastic fibers (such as PEO), polyester elastic fibers (such as PET, PBT, PTT), and polyolefin elastic fibers (such as POE, Dow XLA), etc.

[0003] Elastic fibers have drawbacks such as easy aging, poor hand feel, and easy breakage, often requiring wrapping and being used in fabrics as core-spun yarn. Elastic core-spun yarn is formed by continuously wrapping short fibers around the elastic filaments in their elongated state, such as ring-spun spandex core-spun yarn. Spandex core-spun yarn fabrics often exhibit defects such as poor elastic recovery, easy breakage, and yellowing during subsequent processing, affecting the wearing experience. To address this, double-core elastic core-spun yarn is used, with one core being a pre-stretched spandex filament and the other a polyester elastic fiber (such as PET or PTT). Its unique advantage lies in the fact that the double-core structure combines or enhances the superior properties of the two filaments, achieving both high elastic elongation and good elastic recovery, improving upon the defects of single-component core yarns, further leveraging the advantages of composite materials, and giving textiles unique style and functional characteristics. However, this type of ring-spun spandex core-spun yarn still has various problems, such as uneven fabric bulging due to uneven twisting of the core filaments.

[0004] CN101730762A discloses a composite yarn, wherein the yarn has a core-sheath structure consisting of at least one elastic filament and at least one non-elastic filament, but its fiber sheath portion is composed of chopped short fibers from ring spinning. Ring-spun double-core yarn suffers from low spinning speed and high yarn cost. Furthermore, in actual production, due to the variability of the nip sliver, fibers shift inside and outside during twisting, resulting in quality defects such as incomplete yarn coverage and easy core leakage.

[0005] Air-jet vortex spinning is a novel spinning method. Its yarn formation principle involves the fiber sliver entering the spinning machine at the beginning, being drafted by the drafting mechanism, and then the fiber tail end being wrapped by a high-speed rotating airflow to form yarn. Air-jet vortex spinning speeds can reach 550-600 m / min, which is 25-35 times faster than ring spinning. Therefore, using air-jet vortex spinning to produce core-spun yarn is an economical and efficient new spinning method. However, air-jet vortex spinning is a semi-free-end spinning and core-feeding structure, and can only spin low-elasticity filaments such as PET, PTT, and T400. It cannot core-spun high-elasticity filaments with a certain pre-stretch ratio (such as spandex).

[0006] CN115110180A proposes a production device and method for air-jet vortex spinning of elastic slub yarn. The elastic core yarn involved is formed by reaching different elongation states in an additional slub yarn control unit. It is mainly spun into slub yarn by the additional control unit and cannot be applied to ordinary air-jet vortex spinning of elastic core-spun yarn. Summary of the Invention

[0007] The technical problem this invention aims to solve is to overcome the shortcomings of existing air-jet vortex spinning technology in producing high-elasticity core-spun yarn. This invention provides a spinning method for air-jet vortex spinning of elastic core-spun yarn, which is low-cost, highly efficient, less prone to yarn breakage, and produces woven fabrics with high elongation and elastic recovery. This invention also provides a spinning apparatus for air-jet vortex spinning of elastic core-spun yarn.

[0008] The spinning method of the jet vortex spun elastic core-spun yarn of the present invention is as follows: Two elastic filaments or one elastic filament and one non-elastic filament are pre-stretched by tension pre-adjustment and air jetting, and then wrapped to form a double core yarn. The double core yarn is fed into the front roller nip of the jet vortex spinning drafting zone through a yarn guide at the core-spun yarn device of the jet vortex spinning machine. The fiber sheath is formed into a mature sliver after the previous spinning process, and passes through the trumpet-mouth guide and the drafting zone in sequence. It merges with the double core yarn at the front roller nip of the jet vortex spinning drafting zone and is sucked into the nozzle of the jet vortex spinning machine. Under the action of high-speed rotating airflow, the jet vortex spun elastic core-spun yarn is formed.

[0009] The yarn count of the formed jet vortex spun elastic core-spun yarn is in the range of 30S-60S.

[0010] The elastic filament is spandex filament 20D-140D or T400 filament 30D-70D; the non-elastic filament is water-soluble vinylon 20D-70D, nylon 20D-70D, or polyester 20D-70D. Preferably, the elastic filament is spandex 30D, 40D, or T400 filament 30D, and the non-elastic filament is water-soluble vinylon 50D, nylon 40D, or polyester filament 68D.

[0011] The air jet pressure is 0.30MPa-0.45MPa; the pre-stretch ratio after pre-stretching is 2-5 times. When the air jet pressure and tension pre-adjustment settings are exceeded, the core yarn coverage becomes uneven, and the two core yarns are parallel under tension. In this state, it is impossible to spin air-jet vortex spun elastic core-spun yarn.

[0012] The fiber sheath is made of natural fibers such as cotton, wool, silk, and linen, as well as man-made fibers such as modal and Tencel. The fiber sheath is shaped into a sliver through a pre-spinning process, and the quantitative range of the sliver is 14.5-20g / 5m.

[0013] The total draft ratio of the jet-jet vortex spinning drafting zone is 205-310 times, the main draft ratio is 25-30 times, the support draft ratio is 2.2-3.0 times, the back draft ratio is 3.0-3.4 times, the feed ratio is 0.970-1.000, and the flying wing inertia is adjusted to 120mN-80mN. The feed ratio refers to the ratio of the linear velocity of the front roller to the linear velocity of the friction roller when the twin core yarns meet the fiber sheath in the vortex spinning device.

[0014] The spinning device used in the air-jet vortex spinning method for elastic core-spun yarn includes a tension pre-adjustment device, an air jet device, and an air-jet vortex spinning core-spun yarn device. The air-jet vortex spinning core-spun yarn device includes a bell-shaped guide, a drafting zone, a front roller nip, an air-jet vortex spinning nozzle, a spinning chamber, an electronic yarn clearer, a yarn tension roller, and a tapered tube. According to the yarn direction, the first and second core filaments simultaneously enter the tension pre-adjustment device, which is connected to the air jet device. A double core filament is formed at the outlet and enters the front roller nip. The fiber sheath sliver enters the bell-shaped guide, which is connected to the drafting zone. A front roller nip is located within the drafting zone and connected to the air-jet vortex spinning nozzle. The air-jet vortex spinning nozzle is connected to the spinning chamber, which is connected to the electronic yarn clearer. The electronic yarn clearer is connected to the yarn tension roller, which is connected to the tapered tube. Air-jet vortex spinning elastic core-spun yarn is placed in the tapered tube. The first and second core filaments are either core filaments composed of two elastic filaments or core filaments composed of one elastic filament and one non-elastic filament. The term "connection" refers to the sequence of arrangement of various structures along the yarn's direction.

[0015] The tension pre-adjustment device and the air injection device are installed on the same equipment, which is a mechanical coating machine or a compressed airflow device.

[0016] The air injection device is an air nozzle with an orifice diameter ranging from 1.2 to 1.5 mm. Preferred air nozzle models are DH-12, DH-13, or DH-4317.

[0017] The spinning process using the above spinning device is as follows: Two elastic filaments, or one elastic filament and one non-elastic filament, are passed through a pre-tensioning device and an air jet device to form a pre-stretched, covered double-core yarn. The double-core yarn is then passed through the core-spun yarn device of an air-jet vortex spinneret to form an elastic core-spun yarn. The fiber sheath is formed from a sliver that has been normally processed in the previous spinning process, passing through a bell-mouth guide and drafting zone, and then entering the air-jet vortex spinning chamber. The pre-stretched double-core yarn is fed through a dedicated core yarn feeder in the air-jet vortex spinneret, passing through a tension device and a guide to enter the front roller nip of the drafting zone. Simultaneously, the fiber sheath and the double-core yarn converge at the front roller nip and are then sucked into the nozzle of the air-jet vortex spinneret. In the spinning chamber, the core-spun yarn passes through an electronic yarn clearer and a yarn-drawing tension roller before being wound into a tapered tube. After the air-jet vortex spun elastic core-spun yarn is wound into a cone yarn, it undergoes steaming and setting, and is then cooled to complete the final product.

[0018] A type of yarn fabric is a fabric woven from jet-jet vortex spun elastic core-spun yarn formed by the aforementioned jet-jet vortex spun elastic core-spun yarn spinning method.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) In the spinning method of the vortex-spun elastic core-spun yarn of the present invention, the double core filaments are stably located at the center of the vortex, and the fiber bundles wrap around the core filaments layer by layer under the influence of the rotating airflow. The components of the yarn have excellent cohesion and uniform coverage, forming a true core-spun yarn.

[0021] (2) The spinning method of the vortex spinning elastic core-spun yarn of the present invention pre-stretches the elastic core yarn through an air nozzle and a tension pre-adjustment device, and then spins it into yarn using an air jet vortex spinning core-spun yarn device. This method can overcome the production limitation that the air jet vortex spinning machine cannot directly use elastic yarn to produce core-spun yarn, and endows the air jet vortex spinning equipment with the ability to spin elastic core-spun yarn with a pre-stretch multiple, and produces core-spun yarn with a double core structure using air jet vortex spinning.

[0022] (3) The yarn fabric prepared by the method of the present invention has an elongation of 20%-30%, an elastic recovery rate of 80%-90%, uniform yarn coverage, less hairiness, high fluffiness, and wear-resistant yarn without core exposure; it solves the problem of bulging on the surface of ring-spun core-spun yarn fabric.

[0023] (4) The spinning method of vortex spinning elastic core-spun yarn using the spinning device of the present invention has fewer processes, higher output and lower cost, which is 25-35 times that of ring spinning. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the spinning apparatus used in the spinning method of the jet vortex spinning elastic core-spun yarn of the present invention.

[0025] In the diagram: 1. First core yarn; 2. Second core yarn; 3. Tension pre-adjustment device; 4. Air jet device; 5. Double core yarn; 6. Fiber sheath sliver; 7. Trumpet guide; 8. Drafting zone; 9. Front roller nip; 10. Nozzle of air-jet vortex spinning; 11. Spinning chamber; 12. Electronic yarn clearer; 13. Yarn tension roller; 14. Tapered tube; 15. Air-jet vortex spun elastic core-spun yarn.

[0026] Figure 2 This is a schematic diagram of the twin-core yarn formed in the spinning process of Embodiment 1 of the present invention.

[0027] Figure 3 This is a schematic diagram of the twin-core yarn formed in the spinning process of Comparative Example 2. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments.

[0029] like Figure 1 As shown, the spinning device used in the air-jet vortex spinning method for elastic core-spun yarn includes a tension pre-adjustment device 3, an air jet device 4, and an air-jet vortex spinning core-spun yarn device. The air-jet vortex spinning core-spun yarn device includes a bell-shaped guide 7, a drafting zone 8, a front roller nip 9, an air-jet vortex spinning nozzle 10, a spinning chamber 11, an electronic yarn clearer 12, a yarn tension roller 13, and a tapered tube 14. According to the yarn direction, the first core yarn 1 and the second core yarn 2 simultaneously enter the tension pre-adjustment device 3. The tension pre-adjustment device 3 and the air jet device... The yarn is connected at position 4, and a double-core yarn 5 is formed at the outlet. The double-core yarn 5 enters the front roller nip 9. The fiber sheath sliver 6 enters the bell-mouth guide 7, which is connected to the drafting zone 8. The drafting zone 8 is equipped with the front roller nip 9, which is connected to the nozzle 10 of the air-jet vortex spinning machine. The nozzle 10 of the air-jet vortex spinning machine is connected to the spinning chamber 11, which is connected to the electronic yarn clearer 12. The electronic yarn clearer 12 is connected to the yarn tension roller 13, which is connected to the tapered tube 14. An air-jet vortex spun elastic core-spun yarn 15 is installed in the tapered tube 14. The first core yarn 1 and the second core yarn 2 are core yarns of two elastic filaments or core yarns of one elastic filament and one non-elastic filament. The "connection" refers to the sequence of the various structures along the yarn direction. The core-spun yarn device for jet vortex spinning is an existing jet vortex spinning device for low elasticity filaments such as PET, PTT, and T400. It is a commercially available product, so its internal structure will not be discussed in more detail.

[0030] The tension pre-adjustment device 3 and the air injection device 4 are installed on the same equipment, which is a mechanical coating machine or a compressed airflow device.

[0031] The air injection device 4 is an air nozzle with an orifice diameter ranging from 1.2 to 1.5 mm. Preferred air nozzle models are DH-12, DH-13, or DH-4317.

[0032] The spinning process using the above spinning device is as follows: Two elastic filaments, or one elastic filament and one non-elastic filament, are passed through a pre-tensioning device and an air jet device to form a pre-stretched, covered double-core yarn. The double-core yarn is then passed through the core-spun yarn device of an air-jet vortex spinneret to form an elastic core-spun yarn. The fiber sheath is formed from a sliver that has been normally processed in the previous spinning process, passing through a bell-mouth guide and drafting zone, and then entering the air-jet vortex spinning chamber. The pre-stretched double-core yarn is fed through a dedicated core yarn feeder in the air-jet vortex spinneret, passing through a tension device and a guide to enter the front roller nip of the drafting zone. Simultaneously, the fiber sheath and the double-core yarn converge at the front roller nip and are then sucked into the nozzle of the air-jet vortex spinneret. In the spinning chamber, the core-spun yarn passes through an electronic yarn clearer and a yarn-drawing tension roller before being wound into a tapered tube. After the air-jet vortex spun elastic core-spun yarn is wound into a cone yarn, it undergoes steaming and setting, and is then cooled to complete the final product.

[0033] The following embodiments all use the above-described apparatus for the spinning process.

[0034] Example 1

[0035] use Figure 1 The spinning process shown produces 12.85tex elastic core-spun yarn. The first core filament is 30D spandex filament 1, and the second core filament is 30D T400 filament 2. The tension pre-adjustment device 3 is set to a stretch ratio of 4.5. The air jet device 4 is a DH-12 model, with compressed air pressure of 0.35MPa and a nozzle orifice diameter of 1.4mm. The two elastic filaments pass through the tension pre-adjustment device 3 and the air jet device 4 to form a pre-stretched, wrapped double-core yarn 5. This optimized process results in a double-core yarn exhibiting… Figure 2 The state.

[0036] The outer fiber sheath is made of 50% cotton and 50% modal. After normal pre-spinning processes, a fiber sheath sliver 6 is formed with a basis weight of 15g / 5m. The fiber sheath sliver 6 passes sequentially through the air-jet vortex spinning trumpet guide 7 and the drafting zone 8, with a total draft ratio of 261 times, a main draft ratio of 28 times, a support draft ratio of 3.0 times, and a back draft ratio of 3.1 times. The core-spun yarn feed ratio is 0.972, and the wing inertia adjustment is 120mN. The fiber sheath and the double core yarn 5 converge at the front roller nip 9 through the air-jet vortex spinning core-spun yarn device, forming an air-jet vortex spun elastic core-spun yarn 15 under the action of high-speed rotating airflow. The elastic core-spun yarn produced by this process has a slip friction cycle of 45 times, meeting the abrasion resistance standard. After forming the relevant yarn products, a 2-up, 2-down left-slant weave fabric is woven, and the fabric elongation and elastic recovery are tested.

[0037] Example 2

[0038] like Figure 1 The spinning process shown produces 12.85 tex elastic core-spun yarn. The first core filament is 30D spandex, and the second core filament is 40D nylon. The tension pre-adjustment device 3 is set to a 3.5 times draw ratio. The air jet device 4 is a DH-12 model with compressed air pressure of 0.30 MPa and a nozzle orifice diameter of 1.4 mm. The two elastic filaments pass through the tension pre-adjustment device 3 and the air jet device 4 to form a pre-stretched, wrapped double-core yarn 5. This optimized process results in a double-core yarn exhibiting… Figure 2 The state.

[0039] The outer fiber sheath is made of 50% cotton and 50% modal. After normal pre-spinning processes, a fiber sheath sliver 6 is formed with a basis weight of 15g / 5m. The fiber sheath sliver 6 passes sequentially through the air-jet vortex spinning trumpet guide 7 and the drafting zone 8, with a total draft ratio of 310 times, a main draft ratio of 30 times, a support draft ratio of 3.0 times, and a back draft ratio of 3.4 times. The core-spun yarn feed ratio is 0.980, and the wing inertia adjustment is 120mN. The fiber sheath and the double core yarn 5 converge at the front roller nip 9 through the air-jet vortex spinning core-spun yarn device, forming an air-jet vortex spun elastic core-spun yarn 15 under the action of high-speed rotating airflow. The elastic core-spun yarn produced by this process has a slip friction cycle of 48 times, meeting the abrasion resistance standard. After forming the relevant yarn products, a 2-up, 2-down left-slant weave fabric is woven, and the fabric elongation and elastic recovery are tested.

[0040] Example 3

[0041] like Figure 1 The spinning process shown produces 14.6 tex elastic core-spun yarn. The first core filament is 30D spandex filament 1, and the second core filament is 50D polyester filament 2. The tension pre-adjustment device 3 is set to a stretch ratio of 3.2. The air jet device 4 (model DH-4317) uses compressed air at a pressure of 0.4 MPa with a nozzle orifice diameter of 1.5 mm. The two filaments pass through the tension pre-adjustment device 3 and the air jet device 4 to form a pre-stretched, covered double-core yarn 5. This optimized process results in a double-core yarn exhibiting… Figure 2 The state.

[0042] The outer fiber sheath is made of 100% cotton and undergoes normal pre-spinning processes to form a fiber sheath sliver 6 with a basis weight of 14.5 g / 5m. The fiber sheath sliver 6 sequentially passes through an air-jet vortex spinning bell-mouth guide 7 and a drafting zone 8, with a total draft ratio of 306 times, a main draft ratio of 30 times, a support draft ratio of 2.8 times, and a back draft ratio of 3.4 times. The core-spun yarn feed ratio is 0.991, and the wing inertia adjustment is 120 mN. The fiber sheath and the twin core yarn 5 converge at the front roller nip 9 via an air-jet vortex spinning core-spun yarn device, forming an air-jet vortex spun elastic core-spun yarn 15 under the action of high-speed rotating airflow. The elastic core-spun yarn produced by this process has a slip friction cycle of 45 times, meeting the abrasion resistance standard. After forming the relevant yarn products, a 3-up-1-down left-slant weave fabric is woven, and the fabric elongation and elastic recovery are tested.

[0043] Example 4

[0044] like Figure 1 The spinning process shown produces 19.4 tex elastic core-spun yarn. The first core filament (40D spandex) and the second core filament (50D water-soluble vinylon) are selected. The tension pre-adjustment device (3) is set to a stretch ratio of 3.5. The air jet device (4) is a DH-13 model, with compressed air pressure of 0.4 MPa and a nozzle orifice diameter of 1.2 mm. The two elastic filaments pass through the tension pre-adjustment device (3) and the air jet device (4) to form a pre-stretched, covered double-core yarn (5). This optimized process results in a double-core yarn exhibiting… Figure 2 The state.

[0045] The outer fiber sheath is made of 100% cotton and undergoes normal pre-spinning processes to form a fiber sheath sliver 6 with a basis weight of 17g / 5m. The fiber sheath sliver 6 sequentially passes through an air-jet vortex spinning bell-mouth guide 7 and a drafting zone 8, with a total draft ratio of 270 times, a main draft ratio of 27 times, a support draft ratio of 3.0 times, and a back draft ratio of 3.3 times. The core-spun yarn feed ratio is 0.976, and the wing inertia adjustment is 120mN. The fiber sheath and the double core yarn 5 converge at the front roller nip 9 via an air-jet vortex spinning core-spun yarn device, forming an air-jet vortex spun elastic core-spun yarn 15 under the action of high-speed rotating airflow. The elastic core-spun yarn produced by this process has a slip friction cycle of 45 times, meeting the abrasion resistance standard. After forming the relevant yarn products, a 3-up-1-down left-slant weave fabric is woven, and the fabric elongation and elastic recovery are tested.

[0046] Comparative Example 1

[0047] Not in accordance Figure 1 The spinning process shown aims to produce 19.4 tex elastic core-spun yarn. The first core yarn (40D spandex) and the second core yarn (50D water-soluble vinylon) are selected. The yarn passes directly through the air-jet spinning core-spun yarn device without passing through the air jet device (4) and tension pre-adjustment device (3). The result is that the spandex yarn cannot unwind properly, and the spinning process fails.

[0048] Comparative Example 2

[0049] according to Figure 1 The process shown spins 16.7tex elastic core-spun yarn, selecting 30D spandex filament as the first core filament and 68D nylon filament as the second core filament. The tension pre-adjustment device 3 is set to a 3.5 times draw ratio, and the air jet device 4 (model DH-160) uses compressed air at a pressure of 0.25MPa with a nozzle orifice diameter of 1.6mm. The two elastic filaments form a double-core yarn 5 after passing through the tension pre-adjustment device 3 and the air jet device 4. However, the double-core yarn 5 produced by this process exhibits… Figure 3 The filaments were dispersed, leading to problems such as yarn leakage and incomplete wrapping during subsequent air-jet vortex spinning. The core-spun yarn slipped and rubbed between 10 and 18 times, exhibiting poor abrasion resistance. Furthermore, tests were conducted with a tension pre-adjustment device 3 at a draw ratio of 1.8 and a compressed air jet pressure of 0.25 MPa. Under these parameters, the double-core yarn 5 also exhibited... Figure 3 The states within are discrete, making it impossible to continue spinning using the jet vortex spinning core-spun yarn device.

[0050] The elastic core-spun yarn and fabric products according to the above embodiments and comparative examples were tested, and the test results are shown in Table 1:

[0051] Table 1 Test Results

[0052]

[0053] Based on actual production needs, a pre-draft ratio ≥5 for the elastic core in a two-core yarn with two elastic filaments will increase the risk of yarn breakage and reduce efficiency during spinning. Preferably, the air nozzle models are DH-12, DH-13, and DH-4317. The air nozzle orifice diameter range is 1.2-1.5mm, and the air pressure is 0.30MPa-0.45MPa. The pre-stretching device is set to a pre-stretch ratio of 2-5 times. The preferred feed ratio for the air-jet vortex spinning core-spun yarn is 0.970-1.000. The basis weight of the sliver obtained from the pre-spinning process is 14.5-20g / 5m, the total draft ratio is 205-310 times, the main draft ratio is 25-30 times, the support draft is 2.2-3.0 times, the post-draft draft ratio is 3.0-3.4 times, the core-spun yarn feed ratio is 0.970-1.000, and the wing inertia adjustment is 120mN-80mN. Examples outside the preferred process range all have problems such as poor quality, yarn leakage, and inability to form yarn. Only two of them are used as comparative examples.

[0054] Based on the results in Table 1, the elastic core-spun yarn and its fabric obtained by this invention can achieve a fabric elongation rate of 20%-30% and a fabric elastic recovery rate of 80%-90%. The above description is merely a preferred embodiment of the present invention and should not be considered as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples; equivalent changes and improvements made by those skilled in the art within the scope of the present invention should all fall within the patent coverage of the present invention.

Claims

1. A method for spinning elastic core-spun yarn using air jet vortex spinning, characterized in that: Two elastic filaments or one elastic filament and one non-elastic filament are pre-stretched together through tension pre-adjustment and air jetting to form a double-core yarn. The yarn is then fed into the front roller nip of the drafting zone of the air jet vortex spinning core-spun yarn device through a yarn guide. The fiber sheath is formed into a mature sliver through the previous spinning process and passes through the trumpet-mouth guide and the drafting zone in sequence. It then merges with the double-core yarn at the front roller nip of the drafting zone of the air jet vortex spinning and is sucked into the nozzle of the air jet vortex spinning machine. Under the action of airflow, it forms an air jet vortex spun elastic core-spun yarn. The spinning device used in the jet vortex spinning method for elastic core-spun yarn includes a tension pre-adjustment device (3), an air jet device (4), and a jet vortex spinning core-spun yarn device. The jet vortex spinning core-spun yarn device includes a bell-mouth guide (7), a drafting zone (8), a front roller nip (9), a jet vortex spinning nozzle (10), a spinning chamber (11), an electronic yarn clearer (12), a yarn tension roller (13), and a tapered tube (14). According to the direction of the yarn, the first core yarn (1) and the second core yarn (2) simultaneously enter the tension pre-adjustment device (3). The tension pre-adjustment device (3) is connected to the air jet device (4), and a double core yarn (5) is formed at the outlet. The double core yarn (5) enters the front roller nip (9). The fiber sheath sliver (6) enters the bell mouth guide (7), the bell mouth guide (7) is connected to the drafting zone (8), the drafting zone (8) is provided with a front roller nip (9), the front roller nip (9) is connected to the nozzle (10) of the air jet vortex spinning, the nozzle (10) of the air jet vortex spinning is connected to the spinning chamber (11), the spinning chamber (11) is connected to the electronic yarn clearer (12), the electronic yarn clearer (12) is connected to the yarn tension roller (13), the yarn tension roller (13) is connected to the tapered tube (14), and the air jet vortex spinning elastic core-spun yarn (15) is provided in the tapered tube (14); the fiber sheath is made of cotton, wool, silk, or linen, and the fiber sheath is formed into a sliver after the previous spinning process, and the quantitative range of the sliver is 14.5-20g / 5m; The total draft ratio of the jet vortex spinning drafting zone is 205-310 times, the main draft ratio is 25-30 times, the support draft ratio is 2.2-3.0 times, the back draft ratio is 3.0-3.4 times, the feed ratio is 0.970-1.000, and the wing inertia is adjusted to 120mN-80mN; the tension pre-adjustment device (3) and the air injection device (4) are set together on the same equipment, which is a mechanical coating machine; the air injection device (4) is an air nozzle with an orifice diameter range of 1.2-1.5mm and an air injection pressure of 0.30MPa-0.45MPa.

2. The spinning method for jet vortex spun elastic core-spun yarn according to claim 1, characterized in that: The yarn count of the formed jet vortex spun elastic core-spun yarn is in the range of 30S-60S.

3. The spinning method for jet vortex spun elastic core-spun yarn according to claim 1, characterized in that: The elastic filament is spandex filament 20D-140D or T400 filament 30D-70D; the non-elastic filament is water-soluble vinylon 20D-70D or nylon 20D-70D.

4. The spinning method for jet vortex spun elastic core-spun yarn according to claim 1, characterized in that: The pre-stretching ratio after the pre-stretching process is 2-5 times.

5. A yarn fabric, characterized in that: It is a fabric woven from the jet vortex spun elastic core-spun yarn formed by the spinning method of jet vortex spun elastic core-spun yarn as described in any one of claims 1-4.

Images