An air-jet vortex spinning yarn guiding cone and an air-jet vortex spinning method

Abstract

The application relates to an air-jet vortex spinning yarn guiding cone and an air-jet vortex spinning method, belonging to the field of spinning machines and technologies, which comprises a yarn guiding cone, the yarn guiding cone comprising a first circular cone section, a second circular cone section, a first cylinder section and a second cylinder section which are sequentially connected and coaxially arranged from upstream to downstream, the cone angle of the first circular cone section is 12-20 DEG, the axial length of the first circular cone section is 19-22% of the main length of the spun fiber, and the diameter of the downstream end of the first circular cone section is 12-16% of the main length of the spun fiber. The application can make the air-jet vortex spinning nozzle spin yarn with more excellent mechanical properties under the working condition that the total air pressure in the air chamber is 0.4-0.65 MPa.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of air jet vortex spinning yarn guide cone and air jet vortex spinning method, belong to spinning machinery and technical field. BACKGROUND

[0002] Air jet vortex spinning is an advanced spinning technology, its core lies in the use of high-speed rotating airflow formed in nozzle device to realize the twisting of fiber. In this process, the head end of the fiber entering the nozzle device is first introduced into the inlet of the yarn guide cone, becoming the core part of the yarn, i.e. the core fiber. These core fibers are arranged in parallel, forming the basic structure of the yarn. At the same time, the tail end of the fiber is affected by the high-speed rotating airflow, and it will be laid on the outer wall of the head end of the yarn guide cone and rotate with the airflow. These tail end fibers are wrapped around the outside of the core fibers during rotation, forming wrapped fibers and providing additional strength and stability to the yarn. Compared with traditional ring spinning, the structure of air jet vortex yarn is relatively loose, and the internal and external transfer between fibers is relatively low, which leads to its relatively low strength and mechanical properties. This structural difference makes air jet vortex yarn may not perform as well as ring yarn in some application scenarios.

[0003] The yarn guide cone, as a key component in the nozzle of air jet vortex spinning, its design and structure have a direct impact on the movement state of the fiber during twisting. Therefore, the design of the yarn guide cone is directly related to the structure and mechanical properties of the air jet vortex yarn. A well-designed yarn guide cone can optimize the movement trajectory of the fiber, thereby improving the structure of the yarn and improving its mechanical properties.

[0004] In this technical field, an important research direction is how to design and manufacture a new type of air jet vortex spinning yarn guide cone to improve the mechanical properties of the yarn. This yarn guide cone needs to be able to more effectively control the movement of the fiber, increase the internal and external transfer between fibers, thereby improving the strength and overall performance of the yarn. By improving the structure of the yarn guide cone, air jet vortex yarn can maintain its unique advantages while also being comparable to traditional ring yarn in mechanical properties, or even surpassing it. This will bring new technological breakthroughs to the textile industry, meeting the market's demand for high-performance yarns. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an air jet vortex spinning yarn guide cone that can make the spun yarn have more excellent mechanical properties.

[0006] In order to achieve the above object, the technical scheme of the present application provides a jet vortex spinning yarn guide cone, comprising a yarn guide cone, which comprises a first circular truncated cone section, a second circular truncated cone section, a first circular cylinder section and a second circular cylinder section connected and coaxially arranged in sequence from upstream to downstream, the conical angle of the first circular truncated cone section is 12°-20°, the axial length of the first circular truncated cone section is 19%-22% of the main length of the spun fiber, and the diameter of the downstream end of the first circular truncated cone section is 12%-16% of the main length of the spun fiber.

[0007] Preferably, the diameter of the upstream end of the second circular truncated cone section is equal to the diameter of the downstream end of the first circular truncated cone section, the conical angle of the second circular truncated cone section is 62°-68°, and the axial length of the second circular truncated cone section is 18%-20% of the main length of the spun fiber.

[0008] Preferably, the yarn guide cone is internally provided with a first circular cylindrical hole, a second circular cylindrical hole, a first circular truncated hole, a second circular truncated hole and a third circular cylindrical hole communicated and coaxially arranged in sequence from upstream to downstream, and the upstream end of the first circular truncated cone section is provided with an inlet communicating with the first circular cylindrical hole.

[0009] Preferably, the diameter of the first circular cylindrical hole is smaller than the diameter of the second circular cylindrical hole, the diameter of the second circular cylindrical hole is smaller than the diameter of the upstream end of the first circular truncated hole, the diameter of the upstream end of the second circular truncated hole is equal to the diameter of the downstream end of the first circular truncated hole, and the diameter of the downstream end of the second circular truncated hole is equal to the diameter of the third circular cylindrical hole.

[0010] Preferably, the first circular cylindrical hole is partially or wholly arranged in the first circular truncated cone section, the second circular cylindrical hole and the first circular truncated hole are partially or wholly arranged in the second circular truncated cone section, the second circular truncated hole is partially or wholly arranged in the first circular cylinder section, and the third circular cylindrical hole is partially or wholly arranged in the second circular cylinder section.

[0011] The technical scheme of the present application also provides a jet vortex spinning method, when spinning yarn with a linear density not more than 40 tex, the diameter d of the first circular cylindrical hole and the linear density T of the yarn satisfy the following formula:

[0012] d=0.655+0.043T-0.0006T 2

[0013] wherein the diameter d is in mm, and the linear density T is in tex.

[0014] Preferably, viscose fibers with a body length of 38 mm are used as raw material, the diameter d of the first cylindrical hole and the diameter of the inlet are both 1.3 mm, the taper angle a of the first frustum segment is set to 17°, the axial length h1 is 20.8% of the body length of the spun fiber, the diameter of the downstream end of the first frustum segment is 14.1% of the body length of the spun fiber, the taper angle b of the second frustum segment is 65°, and the axial length h2 is 18.9% of the body length of the spun fiber.

[0015] Preferably, combed cotton fibers with a body length of 33 mm are used as raw material, the diameter d of the first cylindrical hole and the diameter of the inlet are both 1.4 mm, the taper angle a of the first frustum segment is set to 14°, the axial length h1 is 19.7% of the body length of the spun fiber, the diameter of the downstream end of the first frustum segment is 15.3% of the body length of the spun fiber, the taper angle b of the second frustum segment is 67°, and the axial length h2 is 19.1% of the body length of the spun fiber.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The yarn guide cone of the present application sets the taper angle of the first frustum segment to 12°-20°, the axial length to 19%-22% of the body length of the spun fiber, and the diameter of the downstream end to 12%-16% of the body length of the spun fiber, sets the taper angle of the second frustum segment to 62°-68°, and the axial length to 18%-20% of the body length of the spun fiber, so that when spinning yarns with a linear density of not more than 40 tex, the relationship between the diameter d (unit: mm) of the first cylindrical hole and the linear density T (unit: tex) of the yarn satisfies d = 0.655 + 0.043T - 0.0006T 2 , so that the air-jet vortex spinning nozzle can spin yarns with more excellent mechanical properties under the working condition of a total air pressure of 0.4-0.65 MPa in the air chamber. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a longitudinal sectional view of the general structure of the air-jet vortex spinning nozzle device of the embodiment of the present application;

[0019] Figure 2 is a perspective view of the yarn guide cone of Example 1 of the present application;

[0020] Figure 3 is a longitudinal sectional view of the yarn guide cone of Example 1 of the present application;

[0021] Figure 4 is a perspective view of the yarn guide cone of Example 2 of the present application;

[0022] Figure 5 Figure 2 is a longitudinal sectional view of the yarn guide cone of the present application.

[0023] Reference numerals: 1, yarn guide cone; 2, first circular frustum segment; 3, second circular frustum segment; 4, first cylindrical segment; 5, second cylindrical segment; 6, first cylindrical hole; 7, second cylindrical hole; 8, first circular frustum hole; 9, second circular frustum hole; 10, third cylindrical hole; 11, inlet; 12, air-jet vortex spinning nozzle device; 13, fiber guide assembly; 14, vortex tube; 15, yarn guide tube; 16, nozzle housing; 17, guide body; 18, guide needle; 19, fiber guide channel; 20, cylindrical space; 21, air flow injection hole. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] The present application discloses an air-jet vortex spinning yarn guide cone and an air-jet vortex spinning method, aiming to improve the mechanical properties of air-jet vortex yarns to meet the needs of high-quality production. As shown in Figure 1 The yarn guide cone 1 is located inside the air-jet vortex spinning nozzle device 12. The nozzle device 12 is sequentially provided with a fiber guide assembly 13, a vortex tube 14, the yarn guide cone 1 and a yarn guide tube 15 from upstream to downstream. The fiber guide assembly 13, the vortex tube 14, the yarn guide cone 1 and the yarn guide tube 15 are installed in the nozzle housing 16.

[0026] The fiber guide assembly 13 is provided with a guide body 17 and a guide needle 18, and forms a fiber guide channel 19 for guiding the fiber bundle delivered by a drafting device not shown in the figure into the inside of the nozzle device 12.

[0027] The vortex tube 14 is internally provided with a cylindrical space 20 for guiding the fiber bundle and air flow injection holes 21 which are distributed along the circumference of the wall surface of the vortex tube 14 at equal intervals. Compressed air is injected into the cylindrical space 20 inside the vortex tube 14 through the air flow injection holes 21, so as to form a high-speed rotating air flow in the space. The high-speed rotating air flow makes the fiber bundle rotate while being delivered downstream.

[0028] The head end portion of the yarn guide cone 1 is located in the cylindrical space 20 inside the vortex tube 14, which is used to hold the tail end of the fiber bundle when the tail end of the fiber bundle is laid on the outer wall surface of the head end of the yarn guide cone 1 and rotates with the airflow. The yarn guide tube 15 is provided downstream of the yarn guide cone 1, which is used to guide the yarn from the nozzle device 12, which is not shown in the figure.

[0029] The structure of the yarn guide cone 1 is composed of four main parts, namely the first circular truncated cone section 2, the second circular truncated cone section 3, the first circular cylinder section 4 and the second circular cylinder section 5, which are connected in sequence from upstream to downstream and arranged coaxially.

[0030] In this design, the taper angle of the first circular truncated cone section 2 is precisely controlled between 12° and 20°, which helps the fiber tail end to be more fully laid on the outer wall surface of the head end of the yarn guide cone 1. At the same time, the axial length of the first circular truncated cone section 2 is set to be 19% to 22% of the length of the spun fiber body, which helps to maintain the expansion of the fiber tail end at the outer wall surface of the head end of the yarn guide cone 1. In addition, the diameter of the downstream end of the first circular truncated cone section 2 is set to be 12% to 16% of the length of the spun fiber body, and the precise control of this size helps to ensure that the fiber tail end is stably affected by the rotating airflow during the rotation.

[0031] The taper angle of the second circular truncated cone section 3 is set between 62° and 68°, which helps the yarn guide cone 1 to effectively hold the fiber tail end in rotation. The axial length of the second circular truncated cone section 3 is 18% to 20% of the length of the spun fiber body, which helps to reduce the probability of fiber being pulled by the airflow and becoming a falling fiber. The diameter of the downstream end of the first circular truncated cone section 2 is equal to the diameter of the upstream end of the second circular truncated cone section 3, which ensures smooth transition of the fiber between the two circular truncated cone sections, improves the stability of the rotating airflow, and in turn helps to form a yarn with better quality.

[0032] The holes inside the yarn guide cone 1 are provided with first circular cylindrical hole 6, second circular cylindrical hole 7, first circular truncated hole 8, second circular truncated hole 9 and third circular cylindrical hole 10 in sequence from upstream to downstream, which are connected and arranged coaxially. The design of these holes not only ensures the smooth passage of the yarn, but also the effective cooperation between the yarn guide cone 1 and the yarn guide tube 15. In particular, the relationship between the diameter d (unit: mm) of the first circular cylindrical hole 6 and the linear density T (unit: tex) of the yarn is calculated by the formula d = 0.655 + 0.043T - 0.0006T 2 The precise calculation is to meet the needs of yarns with different linear densities, to ensure that the matching between the hole diameter and the linear density of the yarn can reach the best state when spinning the yarn with a linear density not exceeding 40 tex.

[0033] The yarn guide cone 1 of the present application can spin jet vortex yarns with superior mechanical properties by precisely controlling the dimensions and angles of each part, as well as the design of the internal channel. This design not only improves the breaking strength of the yarn, but also helps to improve the uniformity and wear resistance of the yarn, thereby facilitating the production of high-quality jet vortex yarns. Through the application of this yarn guide cone 1, spinning efficiency and product quality can be significantly improved, meeting the market demand for high-quality textiles.

[0034] Example 1:

[0035] Figures 2-3 A jet vortex spinning yarn guide cone provided in Example 1 is detailed. The yarn guide cone 1 is a key component for spinning jet vortex pure viscose yarns, which can use viscose fibers with a body length of 38 mm as raw material and spin jet vortex pure viscose yarns with a linear density T of 21 tex under a nozzle air pressure of 0.58 MPa.

[0036] The design of the yarn guide cone 1 is a fine revolved body structure, consisting of four main parts: a first circular frustum segment 2, a second circular frustum segment 3, a first cylindrical segment 4, and a second cylindrical segment 5. These parts are connected in sequence from upstream to downstream and arranged coaxially, forming a continuous body to provide support for the rotation of the fiber bundle, while making the rotating air flow in the cylindrical space 20 uniform and stable. At the upstream end face of the first circular frustum segment 2, an inlet 11 is provided for the fiber bundle to enter the interior of the yarn guide cone 1. The internal channel is provided with a first cylindrical hole 6, a second cylindrical hole 7, a first circular frustum hole 8, a second circular frustum hole 9, and a third cylindrical hole 10 in sequence from upstream to downstream, which are connected and arranged coaxially. In particular, the inlet 11 is connected to the first cylindrical hole 6, ensuring that the fiber bundle can smoothly enter the interior of the yarn guide cone 1.

[0037] In this embodiment, the diameter d of the first cylindrical hole 6 is equal to the diameter of the inlet 11, both being 1.3 mm. This design satisfies the formula d = 0.655 + 0.043T - 0.0006T 2 , where T is the linear density of the yarn. Such a design makes the diameter of the first cylindrical hole 6 match the linear density of the spun yarn, which is conducive to the close collection of fibers in the yarn. The outlet of the first cylindrical hole 6 is located near the downstream end of the first circular frustum segment 2, which helps the fiber bundle to smoothly enter the guide tube 15 after being output from the first cylindrical hole 6.

[0038] The conical angle a of the first frustoconical section 2 is set to 17°, and the axial length h1 is 7.9 mm, accounting for 20.8% of the length of the spun fiber. Such a design helps the fiber tail end to be more fully laid down and expanded on the head end outer wall surface of the yarn guide cone 1. The diameter of the downstream end of the first frustoconical section 2 is 5.36 mm, accounting for 14.1% of the length of the spun fiber. Precise control of this size helps to ensure that the fiber tail end is subjected to stable rotational airflow during rotation.

[0039] The diameter of the upstream end of the second frustoconical section 3 is equal to the diameter of the downstream end of the first frustoconical section 2, the conical angle b is 65°, and the axial length h2 is 7.2 mm, accounting for 18.9% of the length of the spun fiber. Such a design helps the yarn guide cone 1 to effectively hold the fiber tail end during rotation and reduces the probability of the fiber being pulled by the airflow and becoming a dropped fiber. The diameter of the second cylindrical hole 7 is greater than the diameter of the first cylindrical hole 6, and the diameter of the upstream end of the first frustoconical hole 8 is greater than the diameter of the second cylindrical hole 7. This increasing diameter design helps the yarn guide cone 1 to effectively cooperate with the yarn guide tube 15 and helps to make full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15.

[0040] The second cylindrical hole 7 and the first frustoconical hole 8 are located approximately inside the second frustoconical section 3, and the diameter of the upstream end of the second frustoconical hole 9 is equal to the diameter of the downstream end of the first frustoconical hole 8, and the diameter of the downstream end is equal to the diameter of the third cylindrical hole 10. The second frustoconical hole 9 is located approximately inside the first cylindrical section 4, and the third cylindrical hole 10 is located approximately inside the second cylindrical section 5. This layout helps to make full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15. The diameter of the second cylindrical section 5 is greater than the diameter of the first cylindrical section 4, forming a stepped surface, which helps the yarn guide cone 1 to be stably installed in the nozzle housing 16.

[0041] Compared with the prior art, the yarn guide cone 1 of the present embodiment improves the breaking strength of the air-jet vortex viscose yarn spun under the above working conditions by 8%. This significant improvement is conducive to the production of high-quality air-jet vortex yarn. This improvement not only benefits from the precise design of the yarn guide cone 1, but also from the reasonable layout and size control of the internal channels, which helps to improve the uniformity and strength of the yarn, thereby meeting the production requirements of high-quality textiles.

[0042] Example 2:

[0043] Figures 4-5A yarn introduction cone provided in Example 2 is shown in detail, wherein the same components as in Example 1 are identified by the same reference numerals. The yarn introduction cone 1 is a key component for spinning air-jet vortex pure cotton yarns, which can use combed cotton fibers with a body length of 33 mm as raw materials and spin air-jet vortex pure cotton yarns with a linear density T of 32 tex under a nozzle air pressure of 0.63 MPa.

[0044] The design of the yarn introduction cone 1 is a fine rotary body structure, which consists of four main parts: a first circular frustum segment 2, a second circular frustum segment 3, a first cylindrical segment 4, and a second cylindrical segment 5. These parts are sequentially connected from upstream to downstream and coaxially arranged to form a continuum to provide support for the rotation of the fiber bundle and to make the rotating air flow in the cylindrical space 20 uniform and stable. An inlet 11 is provided on the upstream end face of the first circular frustum segment 2 for the fiber bundle to enter the interior of the yarn introduction cone 1. The internal passage is sequentially provided with a first cylindrical hole 6, a second cylindrical hole 7, a first circular frustum hole 8, a second circular frustum hole 9, and a third cylindrical hole 10, which are connected and coaxially arranged. In particular, the inlet 11 is connected to the first cylindrical hole 6 to ensure that the fiber bundle can smoothly enter the interior of the yarn introduction cone 1.

[0045] In this embodiment, the diameter d of the first cylindrical hole 6 is equal to the diameter of the inlet 11, both being 1.4 mm, which meets the formula d = 0.655 + 0.043T - 0.0006T 2 , where T is the linear density of the yarn. Such a design makes the diameter of the first cylindrical hole 6 match the linear density of the spun yarn, which is conducive to the close collection of fibers in the yarn. The outlet of the first cylindrical hole 6 is located near the downstream end of the first circular frustum segment 2, which helps the fiber bundle to smoothly enter the yarn guide tube 15 after being output from the first cylindrical hole 6.

[0046] The taper angle a of the first circular frustum segment 2 is set to 14°, and the axial length h1 is 6.5 mm, accounting for 19.7% of the body length of the spun fiber. Such a design helps the fiber tail to be more fully laid and expanded on the head end outer wall surface of the yarn introduction cone 1. The downstream end diameter of the first circular frustum segment 2 is 5.05 mm, accounting for 15.3% of the body length of the spun fiber. The accurate control of this size helps to ensure that the fiber tail is subjected to stable rotating air flow during the rotation process.

[0047] The diameter of the upstream end of the second frustoconical section 3 is equal to the diameter of the downstream end of the first frustoconical section 2, the taper angle β is 67°, and the axial length h2 is 6.3 mm, accounting for 19.1% of the length of the main body of the spun fiber. Such a design helps the yarn guide cone 1 effectively hold the tail end of the fiber in rotation and reduces the probability of the fiber being pulled out by the airflow and becoming a dropped fiber. The diameter of the second cylindrical hole 7 is greater than the diameter of the first cylindrical hole 6, and the diameter of the upstream end of the first frustoconical hole 8 is greater than the diameter of the second cylindrical hole 7. This increasing diameter design helps the yarn guide cone 1 effectively cooperate with the yarn guide tube 15 and makes full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15.

[0048] The second cylindrical hole 7 and the first frustoconical hole 8 are located inside the second frustoconical section 3, and the diameter of the upstream end of the second frustoconical hole 9 is equal to the diameter of the downstream end of the first frustoconical hole 8, and the diameter of the downstream end is equal to the diameter of the third cylindrical hole 10. The second frustoconical hole 9 is located inside the first cylindrical section 4, and the third cylindrical hole 10 is located inside the second cylindrical section 5. This layout helps make full use of the internal space of the yarn guide cone 1 to provide stable compressed air for the yarn guide tube 15. The diameter of the second cylindrical section 5 is greater than the diameter of the first cylindrical section 4, forming a stepped surface, which helps the yarn guide cone 1 stably installed in the nozzle shell 16.

[0049] Compared with the prior art, the yarn guide cone 1 using the present embodiment increases the breaking strength of the air-jet vortex pure cotton yarn spun under the above working conditions by 12%, which significantly improves the production of high-quality air-jet vortex yarn. This improvement not only benefits from the precise design of the yarn guide cone 1, but also from the reasonable layout and size control of the internal channels, which helps improve the uniformity and strength of the yarn to meet the production requirements of high-quality textiles.

[0050] Finally, it should be noted that the above description is only for the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A jet vortex spinning method, characterized in that, A yarn-drawing cone (1) is used, which includes a first frustum section (2), a second frustum section (3), a first cylindrical section (4), and a second cylindrical section (5) arranged coaxially from upstream to downstream. The cone angle of the first frustum section (2) is 17°, the axial length of the first frustum section (2) is 20.8% of the length of the main body of the spun fiber, and the diameter of the downstream end of the first frustum section (2) is 14.1% of the length of the main body of the spun fiber. The diameter of the upstream end of the second frustum section (3) is the same as that of the first frustum section (2). The downstream diameters of the segments (2) are equal, the cone angle of the second frustum segment (3) is 65°, and the axial length of the second frustum segment (3) is 18.9% of the length of the spun fiber body; the yarn drawing cone (1) is provided with a first cylindrical hole (6), a second cylindrical hole (7), a first frustum hole (8), a second frustum hole (9), and a third cylindrical hole (10) arranged coaxially from upstream to downstream, and the upstream end of the first frustum segment (2) is provided with an inlet (11) connecting the first cylindrical hole (6); When spinning yarn with a linear density not exceeding 40 tex, the diameter d of the first cylindrical hole (6) and the linear density T of the yarn satisfy the following formula: d=0.655+0.043T-0.0006T 2 , Wherein, the diameter d is in mm, and the linear density T of the yarn is in tex.

2. The jet vortex spinning method according to claim 1, characterized in that, Viscose fiber with a main body length of 38 mm is used as raw material, and jet vortex pure viscose yarn with a linear density T of 21 tex is spun under a nozzle air pressure of 0.58 MPa. The diameter d of the first cylindrical hole (6) and the diameter of the inlet (11) are both 1.3 mm. The axial length h1 of the first frustum section (2) is 7.9 mm. The downstream diameter of the first frustum section (2) is 5.36 mm. The axial length h2 of the second frustum section (3) is 7.2 mm.

3. A jet vortex spinning method, characterized in that, A yarn-drawing cone (1) is used, which includes a first frustum section (2), a second frustum section (3), a first cylindrical section (4), and a second cylindrical section (5) arranged coaxially from upstream to downstream. The cone angle of the first frustum section (2) is 14°, the axial length of the first frustum section (2) is 19.7% of the length of the main body of the spun fiber, and the diameter of the downstream end of the first frustum section (2) is 15.3% of the length of the main body of the spun fiber. The diameter of the upstream end of the second frustum section (3) is the same as that of the first frustum section (2). The downstream diameters of the segments (2) are equal, the cone angle of the second frustum segment (3) is 67°, and the axial length of the second frustum segment (3) is 19.1% of the length of the spun fiber body; the yarn drawing cone (1) is provided with a first cylindrical hole (6), a second cylindrical hole (7), a first frustum hole (8), a second frustum hole (9), and a third cylindrical hole (10) arranged coaxially from upstream to downstream, and the upstream end of the first frustum segment (2) is provided with an inlet (11) connecting to the first cylindrical hole (6); When spinning yarn with a linear density not exceeding 40 tex, the diameter d of the first cylindrical hole (6) and the linear density T of the yarn satisfy the following formula: d=0.655+0.043T-0.0006T 2 , Wherein, the diameter d is in mm, and the linear density T of the yarn is in tex.

4. The jet vortex spinning method according to claim 3, characterized in that, Combed cotton fibers with a main body length of 33 mm are used as raw materials, and jet vortex pure cotton yarn with a linear density T of 32 tex is spun under a nozzle air pressure of 0.63 MPa. The diameter d of the first cylindrical hole (6) and the diameter of the inlet (11) are both 1.4 mm. The axial length h1 of the first frustum section (2) is 6.5 mm. The downstream diameter of the first frustum section (2) is 5.05 mm. The axial length h2 of the second frustum section (3) is 6.3 mm.

5. A jet vortex spinning method according to any one of claims 1-4, characterized in that, The diameter of the first cylindrical hole (6) is smaller than the diameter of the second cylindrical hole (7), the diameter of the second cylindrical hole (7) is smaller than the upstream diameter of the first frustum hole (8), the upstream diameter of the second frustum hole (9) is equal to the downstream diameter of the first frustum hole (8), and the downstream diameter of the second frustum hole (9) is equal to the diameter of the third cylindrical hole (10).

6. The jet vortex spinning method according to claim 5, characterized in that, The first frustum section (2) has some or all of the first cylindrical hole (6) inside, the second frustum section (3) has some or all of the second cylindrical hole (7) and the first frustum hole (8) inside, the first cylindrical section (4) has some or all of the second frustum hole (9) inside, and the second cylindrical section (5) has some or all of the third cylindrical hole (10) inside.

Images