Air-jet-ring composite spinning method and device and yarn produced

Abstract

The present invention discloses a kind of air-jet ring composite spinning method and device and the yarn obtained, method is: after the fiber whisker is fed into the nozzle, it is drawn out by a yarn-drawing roller, and twisted and wound into yarn by the twisting forming mechanism of the ring spinning frame; The fiber whisker is the fiber whisker after the roving is drafted by the drafting mechanism of the ring spinning frame; When the fiber whisker is running in the fiber delivery channel of the nozzle, an air flow I is first applied thereto so that the fiber whisker advances in a certain direction, while making some fibers rotate along the central axis of the fiber whisker, and then an air flow II is applied thereto so that the fibers are transferred inwardly during the forward process, and other fibers are interspersed and entangled during the transfer process; The device includes a nozzle, and the nozzle includes a cylindrical tube II, a cylindrical tube III, a vent tube a and a vent tube b; The yarn is composed of the fiber located at the surface layer and the fiber located at the core layer. The method of the present invention is simple, and the obtained yarn breaking strength is high.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and relates to an air-jet-ring composite spinning method and device and the resulting yarn. Background Art

[0002] The ring spinning process is as follows: roving is fed into the drafting mechanism of the ring spinning frame. The drafting action between rollers and top rollers draws the fiber strands (roving) out longer and thinner. During the drafting process, the fibers are dispersed and aligned simultaneously, straightened and aligned. The strength of ring yarn is related to the yarn twist. When the yarn count and raw material are the same, the strength of the ring yarn increases with the twist. However, once the twist reaches the critical twist, the yarn strength no longer increases with the twist. The reason is that after the parallel and straight fibers are twisted into yarn by the twisting mechanism, the fibers in the outer layer of the yarn body move inward to a greater extent, and the closer they are to the inside of the yarn body, the smaller the degree of fiber transfer. As a result, when the ring yarn is stretched and broken, the friction between the fibers at different positions inside the yarn body is different. The friction between the outer fibers is greater, and the friction between the inner fibers is smaller. The increase in twist will increase the friction between the fibers inside the yarn body. However, due to the cross-sectional geometric structure of the evenly arranged ring yarn fibers, the fibers only have friction with the fibers that are in contact with their outer diameters, and have no other interaction forces with other fibers. Therefore, the strength utilization rate of ring yarn (yarn strength / sum of all fiber strengths in the yarn cross section) is only 45-65%.

[0003] Air-jet spinning or air-jet vortex spinning is one of the new spinning methods that has developed more maturely so far. The geometric structure of air-jet yarn or air-jet vortex yarn is very different from that of ring yarn. Its biggest feature is the skin-core structure, that is, the yarn body is divided into two parts: the surface layer and the core layer. The surface layer is located on the surface of the yarn body and is in the form of wrapped fibers. The core layer is located inside the yarn body, and the fibers in the core layer are arranged parallel to each other. There is no phenomenon of fibers transferring inside and outside the yarn body due to twisting as in ring yarn. Therefore, the strength of air-jet yarn or air-jet vortex yarn mainly comes from the wrapping effect of the surface fibers. Compared with ring yarn of the same specification, its strength is lower.

[0004] To improve the strength of air-jet yarn or air-jet vortex yarn, Patent 202011001192.X discloses a spinning method and vortex yarn with ring-spinning characteristics. The technical measures adopted are: pure cotton yarn is passed through an air-jet vortex spinning machine to produce air-jet vortex yarn, which is then twisted to change the core yarn fibers in the air-jet vortex yarn from an untwisted parallel state to a spiral distribution. Because the method uses the air-jet vortex yarn to be spun first and then twisted, the core yarn fibers are only changed from an untwisted parallel state to a spiral distribution. Although the yarn strength is increased by about 25%, the entire spinning process is prolonged and the cost is increased. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to provide a jet-ring composite spinning method and device and the resulting yarn.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An air-jet-ring composite spinning method wherein fiber strands are fed into a nozzle, drawn out by a yarn drawing roller, and twisted and wound into yarn by a twisting and forming mechanism of a ring spinning frame;

[0008] The fiber strands are the fiber strands after the roving is drafted by the drafting mechanism of the ring spinning frame;

[0009] When the fiber strands are running in the fiber transport channel of the nozzle, air flow I is first applied to them, and then air flow II is applied to them;

[0010] The angle between the direction of the airflow I injected into the fiber delivery channel and the forward direction of the fiber whiskers is 30 to 45 degrees, and the airflow I does not intersect with the central axis of the fiber whiskers, and the spacing is 0.5 to 1 mm. After the airflow I is injected into the fiber delivery channel, it spirals along the forward direction of the fiber whiskers. The airflow I has two functions: ① to make the fiber whiskers advance in a certain direction; ② to make part of the fibers rotate along the central axis of the fiber whiskers. The present invention controls the direction of the airflow I injected into the fiber delivery channel to not intersect with the central axis of the fiber whiskers, and the spacing is 0.5 to 1 mm, so that the airflow I mainly acts on the fibers on the surface of the fiber whiskers. The present invention controls the angle between the direction of the airflow I injected into the fiber delivery channel and the forward direction of the fiber whiskers to be 30 to 45 degrees, and controls the airflow I to spiral along the forward direction of the fiber whiskers after it is injected into the fiber delivery channel, so that the airflow I is injected into the fiber delivery channel to form a spiral airflow, which can act on the outer layer of the fiber whiskers in the fiber delivery channel, causing part of the fibers to rotate along the central axis of the fiber whiskers, thereby forming surface wrapped fibers.

[0011] The direction in which airflow II is injected into the fiber delivery channel is perpendicular to the forward direction of the fiber whiskers and intersects with the central axis of the fiber whiskers. The function of airflow II is to cause the fibers to shift inward during their forward movement and to cause interpenetration and entanglement with other fibers during the transfer process. In order to enable airflow II to play this role, the present invention controls the direction in which airflow II is injected into the fiber delivery channel to be perpendicular to the forward direction of the fiber whiskers and to intersect with the central axis of the fiber whiskers. This arrangement enables the fiber whiskers to be subjected to the inward transfer force when they are subjected to the action of airflow II in the fiber delivery channel, and to shift toward the central axis of the fiber whiskers, and to intersperse and entangle with other fibers during the transfer process.

[0012] When the fiber strands run in the fiber delivery channel of the nozzle, the fibers in the core layer of the fiber strands are subjected to less force, so they are arranged in the direction of forward movement, thereby forming better yarns;

[0013] After the fiber strands leave the nozzle, there are wrapped fibers on the surface, some fibers in the core layer are parallel, and some fibers are intertwined and entangled with each other. At this time, the strength of the yarn is still not ideal. Therefore, the present invention adopts ring twisting to further improve the strength of the yarn.

[0014] As the preferred technical solution:

[0015] In the above-mentioned jet-ring composite spinning method, the pressure of airflow I is 2 to 3 kPa, and the pressure of airflow II is 0.5 to 1 kPa; airflow I is the key to causing part of the fibers to rotate along the central axis of the fiber strands, thereby making the surface layer of the yarn wrapped with fibers, so the pressure of airflow I is relatively large; airflow II is the key to causing the fibers in the core layer of the yarn to interweave and entangle, which can be achieved with a smaller pressure without destroying the overall structure of the yarn; in addition, the pressure of airflow I is greater than the pressure of airflow II, which is conducive to the movement of fibers from front to back along the fiber transport channel.

[0016] In the above-mentioned air-jet-ring composite spinning method, the raw material of the roving is one or more of cotton, polyester and viscose, and the main fiber length is 32 to 38 mm.

[0017] The present invention also provides an air-jet-ring composite spinning device for implementing any of the above air-jet-ring composite spinning methods, comprising a nozzle, the nozzle comprising a cylindrical tube II, a cylindrical tube III, a vent tube a, and a vent tube b;

[0018] Cylindrical tube II and cylindrical tube III are arranged in sequence from left to right, are coaxial, and their central axes are parallel to the left and right directions;

[0019] The side wall of the cylindrical tube II is provided with n through holes I, which are evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II, and n is 4 to 8; the hollow part of the cylindrical tube II is a partial length section of the fiber transmission channel, and the airflow entering the hollow part of the cylindrical tube II from the through hole I is the airflow I; one end of each through hole I intersects with the outer wall of the cylindrical tube II, and the intersection is recorded as point p, and the other end intersects with the inner wall of the cylindrical tube II, and the intersection is recorded as point q. Point p along the length direction of the cylindrical tube II Located to the left of point q; the angle between the central axis of each through hole I and the left-right direction (i.e., the angle between the direction of the airflow I entering the fiber delivery channel and the forward direction of the fiber strands) is 30-45°, and the central axis of each through hole I does not intersect with the central axis of the cylindrical tube II, with a spacing of 0.5-1 mm; the inner wall of the cylindrical tube II is provided with n spiral grooves with the same spiral direction, and the n spiral grooves are respectively used to guide the airflow injected from the n through holes I to spirally advance toward the cylindrical tube III;

[0020] The side wall of the cylindrical tube III is provided with m groups of through holes II, where m is 4 to 6, and each group contains 4 to 6 through holes II uniformly distributed around the central axis of the cylindrical tube III. The first to m groups of through holes II are spaced apart along the length of the cylindrical tube III. The hollow portion of the cylindrical tube III constitutes a portion of the fiber transport channel, and the airflow entering the hollow portion of the cylindrical tube III through the through holes II is the airflow II. The angle between the central axis of each through hole II and the left-right direction (i.e., the angle between the direction of the airflow II entering the fiber transport channel and the direction of advance of the fiber strands) is 90°, and the central axis of each through hole II intersects with the central axis of the cylindrical tube III.

[0021] Only one group of through holes I is provided because the pressure of the airflow I injected from through hole I is relatively high, and one group of through holes I can ensure the airflow pressure required for spinning. Secondly, when only one group of through holes I is provided, the interference effect on the airflow I in the fiber transmission channel is small, and the spiral motion shape can be kept stable. Multiple groups of through holes II are provided because the effect of airflow II causes the fibers to interpenetrate and entangle with each other. If only one group is provided, the interpenetration and entanglement effect is small, and the purpose of enhancing the strength of the yarn cannot be achieved.

[0022] The through hole I is communicated with the vent pipe a, and the through hole II is communicated with the vent pipe b.

[0023] As the preferred technical solution:

[0024] As described above, in a jet-ring composite spinning device, the through hole I is a circular through hole with a diameter of 0.2 to 0.6 mm; the distance between the point p corresponding to the through hole I and the left end of the cylindrical tube II is 3 to 5 mm; the through hole II is a circular through hole with a diameter of 0.2 to 0.6 mm; the distance between two adjacent groups of through holes II is 4 to 8 mm, the distance between the through hole II located on the far left and the left end of the cylindrical tube III is 3 to 5 mm, and the distance between the through hole II located on the far right and the right end of the cylindrical tube III is 3 to 5 mm; the purpose of setting these parameters in this way is to ensure that airflow I and airflow II can achieve better spinning effects.

[0025] In the above-mentioned air-jet-ring composite spinning device, the through hole I is indirectly connected to the ventilation pipe a, and the through hole II is indirectly connected to the ventilation pipe b.

[0026] The air-jet-ring composite spinning device as described above, wherein the nozzle further comprises a housing, a cylindrical tube I, a cylindrical tube IV, a seal a, a seal b, and a seal c;

[0027] Cylindrical tube I, cylindrical tube II, cylindrical tube III, and cylindrical tube IV are connected in sequence from left to right and are coaxial; the hollow portions of cylindrical tube I, cylindrical tube II, cylindrical tube III, and cylindrical tube IV together constitute the fiber transport channel; only partial lengths of cylindrical tube I and cylindrical tube IV are located within the housing; the entire lengths of cylindrical tube II and cylindrical tube III are located within the housing;

[0028] Seal a is sleeved on the right end of cylindrical tube I, seal b is sleeved on the right end of cylindrical tube II, and seal c is sleeved on the left end of cylindrical tube IV; seal a, seal b, cylindrical tube II, and outer shell together form air chamber I, and seal b, seal c, cylindrical tube III, and outer shell together form air chamber II; vent pipe a and vent pipe b are connected to the outer shell; vent pipe a is connected to air chamber I; vent pipe b is connected to air chamber II.

[0029] The shell of the air-jet-ring composite spinning device as described above is in a cubic shape.

[0030] In the above-mentioned jet-ring composite spinning device, the diameter of the hollow portion of the cylindrical tube IV gradually decreases from left to right, so as to make the yarn body change from fluffy to tight, which can better facilitate the twisting effect of the ring twisting mechanism.

[0031] As described above, in a jet-ring composite spinning device, the inner diameter of cylindrical tube I is 2-3 mm and the length is 10-15 mm; the inner diameter of cylindrical tube II is 3-4 mm and the length is 15-20 mm; the inner diameter of cylindrical tube III is 4-5 mm; the inner diameter of cylindrical tube IV is 1-5 mm and the length is 15-20 mm; the function of cylindrical tube I is to guide the fiber into the fiber transport channel. Its inner diameter is smaller and the flow rate of the airflow here is larger, which can better accelerate the fiber; the inner diameter of cylindrical tube II is smaller than that of cylindrical tube III. The purpose is that when the fiber enters cylindrical tube III from cylindrical tube II in the fiber transport channel, due to the sudden increase in spatial volume, the fiber formed into yarn by airflow I inside cylindrical tube II expands outward, making the yarn body more fluffy, thereby creating favorable conditions for airflow II to transfer the fiber inward and entangle with each other in cylindrical tube III.

[0032] The present invention also provides a yarn produced by a jet-ring composite spinning method as described in any of the above items, which is composed of fibers located in the surface layer and fibers located in the core layer, the fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state; wherein, the fibers located in the surface layer are in a wrapped state mainly because of the action of airflow I, the fibers located in the core layer are in a spirally twisted state mainly because the fiber strands are twisted by the twisting forming mechanism of the ring spinning machine, and the fibers located in the core layer are in a mutually interwoven and entangled state mainly because of the action of airflow II.

[0033] As the preferred technical solution:

[0034] As described above, the yarn has an English count of 40 to 80, a twist of 600 to 1200 twists / m, and a breaking strength of 25 to 28 cN / tex; the breaking strength of the yarn produced by the present invention is relatively high mainly because: ① the twist of the yarn, the greater the twist, the higher the strength; ② the fibers wrapped around the surface of the yarn are tightly wrapped; ③ the fibers in the core layer of the yarn are intertwined and entangled with each other; the breaking strength of the yarn produced by the present invention is increased by about 3 to 5% compared with patent 202011001192.X.

[0035] Beneficial effects

[0036] (1) The air-jet-ring composite spinning method of the present invention first allows the fiber sliver to enter a nozzle under the action of an air flow in the ring spinning process. The fiber sliver is subjected to the action of a force in the nozzle, so that the fibers in the fiber sliver are changed from a parallel state to an interlaced and entangled state. The fiber sliver is then drawn out by a yarn drawing roller and then twisted and wound into yarn by a twisting and forming mechanism of a ring spinning frame. The geometric structure of the yarn body includes surface wrapped fibers, the core yarn is changed into a spiral distribution state, and some fibers inside the core yarn are changed into an entangled and knotted state. The utilization rate of the yarn strength is higher, and the strength is further improved.

[0037] (2) The air-jet-ring composite spinning method of the present invention has high yarn strength, which effectively solves the problem of low strength of air-jet yarn;

[0038] (3) The jet-ring spinning method of the present invention can directly form yarn without the need for post-processing of the yarn, thereby shortening the spinning process. By effectively combining jet spinning and ring spinning, the advantages of the two spinning methods are complementary. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the structure of the yarn spun by the air-jet-ring composite spinning method of the present invention;

[0040] Figure 2 Schematic diagram of the process of the air-jet-ring composite spinning method of the present invention;

[0041] Figure 3 Schematic diagram of the structure of the nozzle used in the air-jet-ring composite spinning method of the present invention;

[0042] Figure 4 Schematic diagram of the cross-sectional structure of the nozzle used in the air-jet-ring composite spinning method of the present invention along the axial direction of the cylindrical tube 1;

[0043] Figure 5 and Figure 6Schematic diagram of the connection structure of cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV in the nozzle used in the air-jet-ring composite spinning method of the present invention;

[0044] Among them, 1-nozzle, 2-drafting mechanism, 3-yarn drawing roller, 4-twisting forming mechanism, 5-housing, 6-ventilation tube a, 7-ventilation tube b, 8-cylindrical tube I, 9-cylindrical tube II, 10-cylindrical tube III, 11-cylindrical tube IV, 12-air chamber I, 13-air chamber II, 14-seal a, 15-through hole I, 16-spiral groove, 17-through hole II. DETAILED DESCRIPTION

[0045] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0046] The yarn breaking strength in the following examples and comparative examples was tested with reference to the standard GB / T 3916-1997.

[0047] Example 1

[0048] An air-jet-ring composite spinning device, such as Figures 3 to 6 As shown, the nozzle 1 includes a cubic shell 5, a cylindrical tube I 8, a cylindrical tube II 9, a cylindrical tube III 10, a cylindrical tube IV 14, a vent tube a 6, a vent tube b 7, a seal a14, a seal b, and a seal c;

[0049] like Figure 5 As shown, cylindrical tube I 8, cylindrical tube II 9, cylindrical tube III 10 and cylindrical tube IV 14 are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left-right direction;

[0050] like Figure 4 、 Figure 6 As shown, the side wall of the cylindrical tube II 9 is provided with four through holes I15 evenly distributed around the central axis of the cylindrical tube II 9 and close to the left end of the cylindrical tube II 9;

[0051] The through holes I15 are circular through holes with a diameter of 0.6 mm. One end of each through hole I15 intersects with the outer wall of the cylindrical tube II 9, with the intersection being designated as point p, and the other end intersects with the inner wall of the cylindrical tube II 9, with the intersection being designated as point q. Point p is located to the left of point q along the length of the cylindrical tube II 9, and the distance between point p and the left end of the cylindrical tube II 9 is 3 mm. The central axis of each through hole I15 forms an angle of 30° with the left-right direction, and the central axis of each through hole I15 does not intersect with the central axis of the cylindrical tube II 9, with a spacing of 1 mm. The inner wall of the cylindrical tube II 9 is provided with four spiral grooves 16 having the same spiral direction. The four spiral grooves 16 are respectively used to guide the airflow injected from the four through holes I15 to spiral toward the cylindrical tube III 10.

[0052] like Figure 4 、 Figure 6 As shown, six groups of through holes II 17 are provided on the side wall of the cylindrical tube III 10, each group including four through holes II 17 evenly distributed around the central axis of the cylindrical tube III 10. The first to sixth groups of through holes II 17 are spaced apart along the length direction of the cylindrical tube III 10.

[0053] Through holes II 17 are circular through holes with a diameter of 0.6 mm. The central axis of each through hole II 17 forms an angle of 90° with the left-right direction, and the central axis of each through hole II 17 intersects with the central axis of cylindrical tube III 10. The distance between two adjacent groups of through holes II 17 is 4 mm. The distance between the through hole II 17 on the far left and the left end of cylindrical tube III 10 is 3 mm, and the distance between the through hole II 17 on the far right and the right end of cylindrical tube III 10 is 3 mm.

[0054] Cylindrical tube I 8 has an inner diameter of 3 mm and a length of 10 mm; cylindrical tube II 9 has an inner diameter of 4 mm and a length of 15 mm; cylindrical tube III 10 has an inner diameter of 5 mm; cylindrical tube IV 14 has an inner diameter of 5 mm at the left end and an inner diameter of 3 mm at the right end. The diameter of the hollow portion of cylindrical tube IV 14 gradually decreases from left to right. Cylindrical tube IV 14 is 15 mm long.

[0055] like Figure 4 As shown, only portions of the cylindrical tube I 8 and cylindrical tube IV 14 are located within the housing 5, while the entire lengths of cylindrical tubes II 9 and III 10 are located within the housing 5. Seal a 14 is sleeved on the right end of cylindrical tube I 8, seal b is sleeved on the right end of cylindrical tube II 9, and seal c is sleeved on the left end of cylindrical tube IV 14. Seal a 14, seal b, cylindrical tube II 9, and housing 5 together form an air chamber I 12, and seal b, seal c, cylindrical tube III 10, and housing 5 together form an air chamber II 13.

[0056] The vent pipe a6 and the vent pipe b7 are connected to the housing 5; the vent pipe a6 is connected to the air chamber I12; and the vent pipe b7 is connected to the air chamber II 13.

[0057] A method for composite spinning using the spinning device, as follows Figure 2 As shown, after the fiber strands are fed into the nozzle 1, they are drawn out by the yarn drawing roller 3 and twisted and wound into yarn by the twisting and forming mechanism 4 of the ring spinning frame;

[0058] When the fiber strands run in the fiber transport channel of the nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to the air chamber I through the vent pipe a. The gas enters the hollow part of the cylindrical tube II from the through hole I, forming an air flow I with a pressure of 3 kPa. At the same time, air is supplied to the air chamber II through the vent pipe b. The gas enters the hollow part of the cylindrical tube III from the through hole II, forming an air flow II with a pressure of 1 kPa.

[0059] The fiber whiskers are the fiber whiskers after the roving is drafted by the drafting mechanism 2 of the ring spinning frame; the raw material of the roving is viscose, the roving linear density is 10g / 10m, and the main fiber length is 38mm.

[0060] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 80, a twist of 1200 twists / m, and a breaking strength of 27.6 cN / tex.

[0061] Comparative Example 1

[0062] A jet-ring composite spinning device is basically the same as the jet-ring composite spinning device in Example 1, except that the angle between the central axis of the through hole I and the left-right direction is 25°.

[0063] A method for composite spinning using the spinning device is the same as the composite spinning method in Example 1.

[0064] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 80, a twist of 1200 twists / m, and a breaking strength of 26.5 cN / tex.

[0065] Comparative Example 2

[0066] A jet-ring composite spinning device is basically the same as the jet-ring composite spinning device in Example 1, except that the angle between the central axis of the through hole I and the left-right direction is 50°.

[0067] A method for composite spinning using the spinning device is the same as the composite spinning method in Example 1.

[0068] The yarn prepared by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 80, a twist of 1200 twists / m, and a breaking strength of 26.8 cN / tex.

[0069] Compared with Example 1, the breaking strength of the yarns produced in Comparative Examples 1 to 2 is lower than that in Example 1. This is because in Comparative Example 1, the angle between the central axis of the through hole I and the left-right direction is smaller, so the core layer fiber is not straight enough, and it cannot be fully transferred inside and outside during twisting, so the strength is lower; in Comparative Example 2, the angle between the central axis of the through hole I and the left-right direction is larger, so the number of surface wrapped fibers is smaller, and the final yarn loses some strength compared with Example 1.

[0070] Example 2

[0071] An air-jet-ring composite spinning device includes a nozzle, wherein the nozzle includes a cubic shell, a cylindrical tube I, a cylindrical tube II, a cylindrical tube III, a cylindrical tube IV, a vent tube a, a vent tube b, a seal a, a seal b, and a seal c;

[0072] Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left and right direction;

[0073] The side wall of the cylindrical tube II is provided with 8 through holes I evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II;

[0074] Through hole I is a circular through hole with a diameter of 0.2 mm. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being designated as point p. The other end intersects with the inner wall of cylindrical tube II, with the intersection being designated as point q. Point p is located to the left of point q along the length of cylindrical tube II, and the distance between point p and the left end of cylindrical tube II is 5 mm. The central axis of each through hole I forms an angle of 45° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.5 mm. The inner wall of cylindrical tube II is provided with eight spiral grooves with the same spiral direction. The eight spiral grooves are respectively used to guide the airflow injected from the eight through holes I into the spiral of cylindrical tube III.

[0075] Five groups of through holes II are provided on the side wall of the cylindrical tube III, each group comprising five through holes II uniformly distributed around the central axis of the cylindrical tube III, and the first to fifth groups of through holes II are spaced apart along the length direction of the cylindrical tube III;

[0076] Through holes II are circular with a diameter of 0.2 mm. The central axis of each through hole II forms a 90° angle with the left-right direction, and the central axis of each through hole II intersects with the central axis of cylindrical tube III. The distance between two adjacent groups of through holes II is 6 mm. The distance between the leftmost through hole II and the left end of cylindrical tube III is 4 mm, and the distance between the rightmost through hole II and the right end of cylindrical tube III is 4 mm.

[0077] Cylindrical tube I has an inner diameter of 2 mm and a length of 12 mm; Cylindrical tube II has an inner diameter of 3 mm and a length of 16 mm; Cylindrical tube III has an inner diameter of 4 mm; Cylindrical tube IV has an inner diameter of 4 mm at the left end and 1 mm at the right end, and the diameter of the hollow portion of Cylindrical tube IV gradually decreases from left to right. Cylindrical tube IV is 20 mm long.

[0078] Only portions of cylindrical tubes I and IV are located within the housing, while the entire lengths of cylindrical tubes II and III are located within the housing. Seal a is mounted on the right end of cylindrical tube I, seal b is mounted on the right end of cylindrical tube II, and seal c is mounted on the left end of cylindrical tube IV. Seal a, seal b, cylindrical tube II, and the housing together form air chamber I, while seal b, seal c, cylindrical tube III, and the housing together form air chamber II.

[0079] The vent pipe a and the vent pipe b are connected to the shell; the vent pipe a is communicated with the air chamber I; and the vent pipe b is communicated with the air chamber II.

[0080] A composite spinning method using the spinning device includes feeding fiber strands into a nozzle, drawing them out using a yarn drawing roller, and twisting and winding them into yarn using a twisting and forming mechanism of a ring spinning frame;

[0081] When the fiber strands run in the fiber transport channel of the nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to the air chamber I through the vent pipe a. The gas enters the hollow part of the cylindrical tube II from the through hole I, forming an air flow I with a pressure of 2 kPa. At the same time, air is supplied to the air chamber II through the vent pipe b. The gas enters the hollow part of the cylindrical tube III from the through hole II, forming an air flow II with a pressure of 0.5 kPa.

[0082] The fiber whiskers are the fiber whiskers obtained by drawing the roving through the drawing mechanism of the ring spinning frame; the raw material of the roving is polyester, the linear density of the roving is 10g / 10m, and the main length of the fiber is 35mm.

[0083] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 60, a twist of 900 twists / m, and a breaking strength of 27.3 cN / tex.

[0084] Example 3

[0085] An air-jet-ring composite spinning device includes a nozzle, wherein the nozzle includes a cubic shell, a cylindrical tube I, a cylindrical tube II, a cylindrical tube III, a cylindrical tube IV, a vent tube a, a vent tube b, a seal a, a seal b, and a seal c;

[0086] Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left and right direction;

[0087] The side wall of the cylindrical tube II is provided with five through holes I evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II;

[0088] Through hole I is a circular through hole with a diameter of 0.5 mm. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being designated as point p, and the other end intersects with the inner wall of cylindrical tube II, with the intersection being designated as point q. Point p is located to the left of point q along the length of cylindrical tube II, and the distance between point p and the left end of cylindrical tube II is 4 mm. The central axis of each through hole I forms an angle of 32° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.6 mm. The inner wall of cylindrical tube II is provided with five spiral grooves with the same spiral direction. The five spiral grooves are respectively used to guide the airflow injected from the five through holes I to spiral into cylindrical tube III.

[0089] Six groups of through holes II are provided on the side wall of the cylindrical tube III, each group comprising four through holes II uniformly distributed around the central axis of the cylindrical tube III, and the first to sixth groups of through holes II are spaced apart along the length direction of the cylindrical tube III;

[0090] Through holes II are circular with a diameter of 0.6 mm. The central axis of each through hole II forms a 90° angle with the left-right direction, and the central axis of each through hole II intersects with the central axis of cylindrical tube III. The distance between two adjacent groups of through holes II is 8 mm. The distance between the leftmost through hole II and the left end of cylindrical tube III is 5 mm, and the distance between the rightmost through hole II and the right end of cylindrical tube III is 5 mm.

[0091] Cylindrical tube I has an inner diameter of 2.5 mm and a length of 15 mm; Cylindrical tube II has an inner diameter of 3.5 mm and a length of 20 mm; Cylindrical tube III has an inner diameter of 4.5 mm; Cylindrical tube IV has an inner diameter of 4.5 mm at the left end and 2 mm at the right end. The diameter of the hollow portion of Cylindrical tube IV gradually decreases from left to right. Cylindrical tube IV is 18 mm long.

[0092] Only portions of cylindrical tubes I and IV are located within the housing, while the entire lengths of cylindrical tubes II and III are located within the housing. Seal a is mounted on the right end of cylindrical tube I, seal b is mounted on the right end of cylindrical tube II, and seal c is mounted on the left end of cylindrical tube IV. Seal a, seal b, cylindrical tube II, and the housing together form air chamber I, while seal b, seal c, cylindrical tube III, and the housing together form air chamber II.

[0093] The vent pipe a and the vent pipe b are connected to the shell; the vent pipe a is communicated with the air chamber I; and the vent pipe b is communicated with the air chamber II.

[0094] A composite spinning method using the spinning device includes feeding fiber strands into a nozzle, drawing them out using a yarn drawing roller, and twisting and winding them into yarn using a twisting and forming mechanism of a ring spinning frame;

[0095] When the fiber strands run in the fiber transport channel of nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to air chamber I through vent pipe a. The gas enters the hollow part of cylindrical tube II from through hole I, forming air flow I with a pressure of 2.8 kPa. At the same time, air is supplied to air chamber II through vent pipe b. The gas enters the hollow part of cylindrical tube III from through hole II, forming air flow II with a pressure of 0.9 kPa.

[0096] The fiber whiskers are the fiber whiskers obtained by drawing the roving through the drawing mechanism of the ring spinning frame; the raw material of the roving is cotton, the linear density of the roving is 10g / 10m, and the main length of the fiber is 32mm.

[0097] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 40, a twist of 600 twists / m, and a breaking strength of 25.5 cN / tex.

[0098] Comparative Example 3

[0099] An air-jet-ring composite spinning device, which is substantially the same as the air-jet-ring composite spinning device in Example 3, except that the inner wall of the cylindrical tube II is not provided with a spiral groove;

[0100] A method for composite spinning using the spinning device is the same as the composite spinning method in Example 3.

[0101] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 40, a twist of 600 twists / m, and a breaking strength of 24.3 cN / tex.

[0102] Compared with Example 3, the breaking strength of the yarn prepared in Comparative Example 3 is lower than that in Example 3. This is because the inner wall of the cylindrical tube II of Comparative Example 3 is not provided with a spiral groove, so the airflow does not rotate sufficiently in the cylindrical tube II and cannot be well guided, resulting in insufficient parallel straightness of the fibers in the cylindrical tube II, less wrapped fibers formed on the surface, and ultimately reduced yarn strength.

[0103] Example 4

[0104] An air-jet-ring composite spinning device includes a nozzle, wherein the nozzle includes a cubic shell, a cylindrical tube I, a cylindrical tube II, a cylindrical tube III, a cylindrical tube IV, a vent tube a, a vent tube b, a seal a, a seal b, and a seal c;

[0105] Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left and right direction;

[0106] The side wall of the cylindrical tube II is provided with six through holes I evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II;

[0107] Through hole I is a circular through hole with a diameter of 0.3 mm. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being designated as point p. The other end intersects with the inner wall of cylindrical tube II, with the intersection being designated as point q. Point p is located to the left of point q along the length of cylindrical tube II, and the distance between point p and the left end of cylindrical tube II is 3 mm. The central axis of each through hole I forms an angle of 40° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.8 mm. The inner wall of cylindrical tube II is provided with six spiral grooves with the same spiral direction. The six spiral grooves are respectively used to guide the airflow injected from the six through holes I to spiral into cylindrical tube III.

[0108] Four groups of through holes II are provided on the side wall of the cylindrical tube III, each group comprising five through holes II uniformly distributed around the central axis of the cylindrical tube III, and the first to fourth groups of through holes II are spaced apart along the length direction of the cylindrical tube III;

[0109] Through holes II are circular with a diameter of 0.5 mm. The central axis of each through hole II forms a 90° angle with the left-right direction, and the central axis of each through hole II intersects with the central axis of cylindrical tube III. The distance between two adjacent groups of through holes II is 5 mm. The distance between the leftmost through hole II and the left end of cylindrical tube III is 3 mm, and the distance between the rightmost through hole II and the right end of cylindrical tube III is 3 mm.

[0110] Cylindrical tube I has an inner diameter of 2.6 mm and a length of 11 mm; Cylindrical tube II has an inner diameter of 3.8 mm and a length of 17 mm; Cylindrical tube III has an inner diameter of 4.8 mm; Cylindrical tube IV has an inner diameter of 4.8 mm at the left end and 2.5 mm at the right end. The diameter of the hollow portion of Cylindrical tube IV gradually decreases from left to right. Cylindrical tube IV is 17 mm long.

[0111] Only portions of cylindrical tubes I and IV are located within the housing, while the entire lengths of cylindrical tubes II and III are located within the housing. Seal a is mounted on the right end of cylindrical tube I, seal b is mounted on the right end of cylindrical tube II, and seal c is mounted on the left end of cylindrical tube IV. Seal a, seal b, cylindrical tube II, and the housing together form air chamber I, while seal b, seal c, cylindrical tube III, and the housing together form air chamber II.

[0112] The vent pipe a and the vent pipe b are connected to the shell; the vent pipe a is communicated with the air chamber I; and the vent pipe b is communicated with the air chamber II.

[0113] A composite spinning method using the spinning device includes feeding fiber strands into a nozzle, drawing them out using a yarn drawing roller, and twisting and winding them into yarn using a twisting and forming mechanism of a ring spinning frame;

[0114] When the fiber strands run in the fiber transport channel of nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to air chamber I through vent pipe a. The gas enters the hollow part of cylindrical tube II from through hole I, forming air flow I with a pressure of 2.2 kPa. At the same time, air is supplied to air chamber II through vent pipe b. The gas enters the hollow part of cylindrical tube III from through hole II, forming air flow II with a pressure of 0.6 kPa.

[0115] The fiber whiskers are the fiber whiskers obtained by drawing the roving through the drawing mechanism of the ring spinning frame; the raw material of the roving is viscose, the linear density of the roving is 10g / 10m, and the main length of the fiber is 35mm.

[0116] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 60, a twist of 900 twists / m, and a breaking strength of 26.4 cN / tex.

[0117] Comparative Example 4

[0118] An air-jet-ring composite spinning device, substantially the same as the air-jet-ring composite spinning device of Example 4, differing only in that: one end of each through hole II intersects with the outer wall of the cylindrical tube III, the intersection being denoted as point u, and the other end intersects with the inner wall of the cylindrical tube III, the intersection being denoted as point v. Point u is located to the left of point v along the length of the cylindrical tube III. The distance between the midpoints u of two adjacent groups of through holes II is 5 mm. The distance between the leftmost point u and the left end of the cylindrical tube III is 3 mm, and the distance between the rightmost point u and the right end of the cylindrical tube III is 3 mm. The angle between the central axis of each through hole II and the left-right direction is 85°.

[0119] A method for composite spinning using the above-mentioned spinning device is the same as the composite spinning method in Example 4.

[0120] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 60, a twist of 900 twists / m, and a breaking strength of 23.5 cN / tex.

[0121] Compared with Example 4, the breaking strength of the yarn prepared in Comparative Example 4 is lower than that in Example 4. This is because the angle between the central axis of each through hole II in Comparative Example 4 and the left-right direction is smaller, and the degree of inward entanglement and transfer of fibers is smaller, which reduces the strength utilization coefficient of the fibers in the yarn, thereby reducing the yarn strength.

[0122] Example 5

[0123] An air-jet-ring composite spinning device includes a nozzle, wherein the nozzle includes a cubic shell, a cylindrical tube I, a cylindrical tube II, a cylindrical tube III, a cylindrical tube IV, a vent tube a, a vent tube b, a seal a, a seal b, and a seal c;

[0124] Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left and right direction;

[0125] The side wall of the cylindrical tube II is provided with seven through holes I evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II;

[0126] Through hole I is a circular through hole with a diameter of 0.4 mm. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being designated as point p. The other end intersects with the inner wall of cylindrical tube II, with the intersection being designated as point q. Point p is located to the left of point q along the length of cylindrical tube II, and the distance between point p and the left end of cylindrical tube II is 4 mm. The central axis of each through hole I forms an angle of 35° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.7 mm. The inner wall of cylindrical tube II is provided with seven spiral grooves with the same spiral direction. The seven spiral grooves are respectively used to guide the airflow injected from the seven through holes I into the spiral of cylindrical tube III.

[0127] Five groups of through holes II are provided on the side wall of the cylindrical tube III, each group comprising six through holes II uniformly distributed around the central axis of the cylindrical tube III, and the first to fifth groups of through holes II are spaced apart along the length direction of the cylindrical tube III;

[0128] Through holes II are circular with a diameter of 0.4 mm. The central axis of each through hole II forms a 90° angle with the left-right direction, and the central axis of each through hole II intersects with the central axis of cylindrical tube III. The distance between two adjacent groups of through holes II is 7 mm. The distance between the leftmost through hole II and the left end of cylindrical tube III is 4 mm, and the distance between the rightmost through hole II and the right end of cylindrical tube III is 4 mm.

[0129] Cylindrical tube I has an inner diameter of 2.2 mm and a length of 13 mm; Cylindrical tube II has an inner diameter of 3.6 mm and a length of 18 mm; Cylindrical tube III has an inner diameter of 4.7 mm; Cylindrical tube IV has an inner diameter of 4.7 mm at the left end and 2.6 mm at the right end. The diameter of the hollow portion of Cylindrical tube IV gradually decreases from left to right. Cylindrical tube IV is 16 mm long.

[0130] Only portions of cylindrical tubes I and IV are located within the housing, while the entire lengths of cylindrical tubes II and III are located within the housing. Seal a is mounted on the right end of cylindrical tube I, seal b is mounted on the right end of cylindrical tube II, and seal c is mounted on the left end of cylindrical tube IV. Seal a, seal b, cylindrical tube II, and the housing together form air chamber I, while seal b, seal c, cylindrical tube III, and the housing together form air chamber II.

[0131] The vent pipe a and the vent pipe b are connected to the shell; the vent pipe a is communicated with the air chamber I; and the vent pipe b is communicated with the air chamber II.

[0132] A composite spinning method using the spinning device includes feeding fiber strands into a nozzle, drawing them out using a yarn drawing roller, and twisting and winding them into yarn using a twisting and forming mechanism of a ring spinning frame;

[0133] When the fiber strands run in the fiber transport channel of nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to air chamber I through vent pipe a. The gas enters the hollow part of cylindrical tube II from through hole I, forming air flow I with a pressure of 2.5 kPa. At the same time, air is supplied to air chamber II through vent pipe b. The gas enters the hollow part of cylindrical tube III from through hole II, forming air flow II with a pressure of 0.7 kPa.

[0134] The fiber whiskers are the fiber whiskers obtained by drawing the roving through the drawing mechanism of the ring spinning frame; the raw material of the roving is cotton, the linear density of the roving is 10g / 10m, and the main length of the fiber is 32mm.

[0135] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 40, a twist of 600 twists / m, and a breaking strength of 25 cN / tex.

[0136] Comparative Example 5

[0137] An air-jet-ring composite spinning device, which is substantially the same as the air-jet-ring composite spinning device in Example 5, except that the central axis of each through hole II does not intersect with the central axis of the cylindrical tube III, and the spacing is 1 mm;

[0138] A method for composite spinning using the above-mentioned spinning device is the same as the composite spinning method in Example 5.

[0139] The yarn produced by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 40, a twist of 600 twists / m, and a breaking strength of 22 cN / tex.

[0140] Compared with Example 5, the breaking strength of the yarn produced in Comparative Example 5 is lower than that in Example 5. This is because the central axis of each through hole II in Comparative Example 5 does not intersect with the central axis of the cylindrical tube III, so that when the fibers are transferred inward in the core layer, they cannot be completely transferred to the inside of the core layer and become entangled, thereby reducing the strength of the yarn.

[0141] Example 6

[0142] An air-jet-ring composite spinning device includes a nozzle, wherein the nozzle includes a cubic shell, a cylindrical tube I, a cylindrical tube II, a cylindrical tube III, a cylindrical tube IV, a vent tube a, a vent tube b, a seal a, a seal b, and a seal c;

[0143] Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, the four are coaxial and the central axis is parallel to the left and right direction;

[0144] The side wall of the cylindrical tube II is provided with six through holes I evenly distributed around the central axis of the cylindrical tube II and close to the left end of the cylindrical tube II;

[0145] Through hole I is a circular through hole with a diameter of 0.4 mm. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being designated as point p. The other end intersects with the inner wall of cylindrical tube II, with the intersection being designated as point q. Point p is located to the left of point q along the length of cylindrical tube II, and the distance between point p and the left end of cylindrical tube II is 5 mm. The central axis of each through hole I forms an angle of 42° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.5 mm. The inner wall of cylindrical tube II is provided with six spiral grooves with the same spiral direction. The six spiral grooves are respectively used to guide the airflow injected from the six through holes I into the spiral of cylindrical tube III.

[0146] Six groups of through holes II are provided on the side wall of the cylindrical tube III, each group comprising five through holes II uniformly distributed around the central axis of the cylindrical tube III, and the first to sixth groups of through holes II are spaced apart along the length direction of the cylindrical tube III;

[0147] Through holes II are circular with a diameter of 0.2 mm. The central axis of each through hole II forms a 90° angle with the left-right direction, and the central axis of each through hole II intersects with the central axis of cylindrical tube III. The distance between two adjacent groups of through holes II is 8 mm. The distance between the leftmost through hole II and the left end of cylindrical tube III is 5 mm, and the distance between the rightmost through hole II and the right end of cylindrical tube III is 5 mm.

[0148] Cylindrical tube I has an inner diameter of 2.8 mm and a length of 14 mm; Cylindrical tube II has an inner diameter of 3.2 mm and a length of 20 mm; Cylindrical tube III has an inner diameter of 4.3 mm; Cylindrical tube IV has an inner diameter of 4.3 mm at the left end and 1.5 mm at the right end. The diameter of the hollow portion of Cylindrical tube IV gradually decreases from left to right. Cylindrical tube IV is 20 mm long.

[0149] Only portions of cylindrical tubes I and IV are located within the housing, while the entire lengths of cylindrical tubes II and III are located within the housing. Seal a is mounted on the right end of cylindrical tube I, seal b is mounted on the right end of cylindrical tube II, and seal c is mounted on the left end of cylindrical tube IV. Seal a, seal b, cylindrical tube II, and the housing together form air chamber I, while seal b, seal c, cylindrical tube III, and the housing together form air chamber II.

[0150] The vent pipe a and the vent pipe b are connected to the shell; the vent pipe a is communicated with the air chamber I; and the vent pipe b is communicated with the air chamber II.

[0151] A composite spinning method using the spinning device includes feeding fiber strands into a nozzle, drawing them out using a yarn drawing roller, and twisting and winding them into yarn using a twisting and forming mechanism of a ring spinning frame;

[0152] When the fiber strands run in the fiber transport channel of nozzle 1 (composed of the hollow parts of cylindrical tubes I, II, III, and IV), air is supplied to air chamber I through vent pipe a. The gas enters the hollow part of cylindrical tube II from through hole I, forming air flow I with a pressure of 2.6 kPa. At the same time, air is supplied to air chamber II through vent pipe b. The gas enters the hollow part of cylindrical tube III from through hole II, forming air flow II with a pressure of 0.8 kPa.

[0153] The fiber whiskers are the fiber whiskers obtained by drawing the roving through the drawing mechanism of the ring spinning frame; the raw material of the roving is polyester, the linear density of the roving is 10g / 10m, and the main length of the fiber is 38mm.

[0154] The yarn prepared by the above method is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer are in a wrapped state, and the fibers located in the core layer are in a spirally twisted, interwoven, and entangled state. The yarn has an English count of 80, a twist of 1200 twists / m, and a breaking strength of 28 cN / tex.

Claims

1. A method for composite spinning of air-jet and ring spinning, characterized in that: After the fiber strands are fed into the nozzle, they are drawn out by the yarn drawing roller and twisted and wound into yarn by the twisting and forming mechanism of the ring spinning frame. The fiber strands are the fiber strands after the roving is drafted by the drafting mechanism of the ring spinning frame; When the fiber strands are running in the fiber transport channel of the nozzle, air flow I is first applied to them, and then air flow II is applied to them; The angle between the direction of the airflow I entering the fiber delivery channel and the advancing direction of the fiber strands is 30 to 45 degrees, and the airflow I does not intersect the central axis of the fiber strands, and the spacing is 0.5 to 1 mm. After entering the fiber delivery channel, the airflow I spirals along the advancing direction of the fiber strands. The direction of air flow II entering the fiber delivery channel is perpendicular to the advancing direction of the fiber strands and intersects with the central axis of the fiber strands; The pressure of air flow I is 2~3KPa, and the pressure of air flow II is 0.5~1KPa.

2. The air-jet-ring composite spinning method according to claim 1, characterized in that: The raw material of the roving is one or more of cotton, polyester and viscose, and the main fiber length is 32 to 38 mm.

3. An air-jet-ring composite spinning device for implementing the air-jet-ring composite spinning method according to any one of claims 1 to 2, characterized in that: The nozzle includes a cylindrical tube II, a cylindrical tube III, a vent tube a and a vent tube b; Cylindrical tube II and cylindrical tube III are arranged in sequence from left to right, are coaxial, and their central axes are parallel to the left and right directions; The side wall of cylindrical tube II is provided with n through holes I, where n is 4 to 8, evenly distributed around the central axis of cylindrical tube II and near the left end of cylindrical tube II. One end of each through hole I intersects with the outer wall of cylindrical tube II, with the intersection being denoted as point p, and the other end intersects with the inner wall of cylindrical tube II, with the intersection being denoted as point q. Point p is located to the left of point q along the length of cylindrical tube II. The central axis of each through hole I forms an angle of 30 to 45° with the left-right direction, and the central axis of each through hole I does not intersect with the central axis of cylindrical tube II, with a spacing of 0.5 to 1 mm. The inner wall of cylindrical tube II is provided with n spiral grooves having the same spiral direction, each of which is used to guide airflow injected from the n through holes I to spiral toward cylindrical tube III. The side wall of the cylindrical tube III is provided with m groups of through holes II, where m is 4 to 6, and each group contains 4 to 6 through holes II uniformly distributed around the central axis of the cylindrical tube III. The through holes II of the first to m groups are spaced apart along the length of the cylindrical tube III. The central axis of each through hole II forms an angle of 90° with the left-right direction, and the central axis of each through hole II intersects with the central axis of the cylindrical tube III. The through hole I is communicated with the vent pipe a, and the through hole II is communicated with the vent pipe b.

4. The air-jet-ring composite spinning device according to claim 3, characterized in that: Through hole I is a circular through hole with a diameter of 0.2 to 0.6 mm; the distance between point p corresponding to through hole I and the left end of cylindrical tube II is 3 to 5 mm; through hole II is a circular through hole with a diameter of 0.2 to 0.6 mm; the distance between two adjacent groups of through holes II is 4 to 8 mm, the distance between the through hole II located on the far left and the left end of cylindrical tube III is 3 to 5 mm, and the distance between the through hole II located on the far right and the right end of cylindrical tube III is 3 to 5 mm.

5. The air-jet-ring composite spinning device according to claim 3, characterized in that: The through hole I is indirectly connected to the vent pipe a, and the through hole II is indirectly connected to the vent pipe b.

6. The air-jet-ring composite spinning device according to claim 5, characterized in that: The nozzle also includes a shell, a cylindrical tube I, a cylindrical tube IV, a seal a, a seal b, and a seal c; Cylindrical tube I, cylindrical tube II, cylindrical tube III and cylindrical tube IV are connected in sequence from left to right, and the four are coaxial; only part of the length of cylindrical tube I and cylindrical tube IV is located in the shell; the entire length of cylindrical tube II and cylindrical tube III is located in the shell; Seal a is sleeved on the right end of cylindrical tube I, seal b is sleeved on the right end of cylindrical tube II, and seal c is sleeved on the left end of cylindrical tube IV; seal a, seal b, cylindrical tube II, and outer shell together form air chamber I, and seal b, seal c, cylindrical tube III, and outer shell together form air chamber II; vent pipe a and vent pipe b are connected to the outer shell; vent pipe a is connected to air chamber I; vent pipe b is connected to air chamber II.

7. The air-jet-ring composite spinning device according to claim 6, characterized in that: The diameter of the hollow portion of the cylindrical tube IV gradually decreases from left to right.

8. The yarn produced by the air-jet-ring composite spinning method according to any one of claims 1 to 2, characterized in that: It is composed of fibers located in the surface layer and fibers located in the core layer. The fibers located in the surface layer exist in a entangled state, and the fibers located in the core layer exist in a spirally twisted, interwoven and entangled state.

9. The yarn according to claim 8, characterized in that The yarn has an English count of 40 to 80, a twist of 600 to 1200 twists / m, and a breaking strength of 25 to 28 cN / tex.

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