Production process and equipment of fine denier semi-dull fully drawn yarn

Abstract

The application provides a fine denier semi-dull full-draft yarn production process and equipment, and relates to the technical field of spinning. The fine denier semi-dull full-draft yarn production process and equipment comprises a polymer melt 、 distribution melt 、 spinning 、 melt extrusion 、 cooling 、 oiling 、 heat stretching, setting and winding. In the application, the temperature of the heat roller is set to 145 DEG C, the tension at the outlet of the heat box is 11 cN, the area of the heat roller contacted by the yarn is large, the yarn is evenly heated, the boiling water shrinkage of the fiber can reach 6-7%, compared with conventional products on the market, there is a great improvement, the fabric is soft, smooth, evenly dyed and bright in color, the product grade is obviously improved, when cooling, the yarn is cooled from the inside and outside at the same time by using the inside and outside bidirectional cooling ring blowing device, the yarn is really cooled in 360 DEG without dead angle, and the uneven dyeing phenomenon caused by the incomplete cooling of the yarn is avoided.

Description

Technical Field

[0001] This invention relates to the field of spinning technology, specifically to the production process and equipment for fine denier semi-dull fully drawn yarn. Background Technology

[0002] In the domestic market of the apparel industry, with the government's continuous stimulus to consumption, market expectations for the apparel industry are recovering, which is expected to contribute about 3.4% to the incremental demand for polyester filament. The textile industry, represented by polyester filament, has entered a period of rapid development and opportunity. As a technology-driven industry, the product performance, quality, and cost advantages formed through technological innovation are the key to enterprises winning in fierce market competition. Market research has found that fabrics woven from fine denier semi-dull fully drawn polyester filament have a large market demand and broad development prospects. Polyester taffeta fabric is made from fine denier semi-dull polyester filament, which has a smooth hand feel, lightweight texture, and low shrinkage rate. It is not prone to wrinkling or shrinkage during use, has a certain fashion sense, and is suitable for down jacket linings, thermal underwear fabrics, and various high-end clothing fabrics, and is deeply loved and welcomed by consumers.

[0003] Because the weaving and finishing requirements of this product are high, the requirements for spinning process conditions and physical properties of filaments are more stringent. The fabric characteristics require smoothness, softness, and flatness, and the fabric characteristics depend on the shrinkage rate of the fiber itself. Currently, the boiling water shrinkage rate of mature semi-dull polyester filament fibers on the market is generally between 4.5% and 6.0%, which needs to be further improved. Moreover, the biggest problem affecting product quality during fiber finishing is uneven dyeing, which is analyzed to be caused by uneven cooling of the filament bundle during the spinning process. Although there are many technologies on the market to improve the uniformity of filament bundle cooling, they are all limited to traditional structures and lack significant innovation, resulting in a lack of significant improvement in the uniformity of filament bundle cooling. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a production process and equipment for fine denier semi-dull fully drawn yarn, which solves the problems of excessively low boiling water shrinkage rate of existing semi-dull polyester filament fibers and uneven dyeing caused by uneven cooling during yarn production.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a production process for fine denier semi-dull fully drawn yarn, the process comprising the following steps:

[0008] S1, Polymerization melt: Raw materials are added to a polyester final polymerization reactor and melted to obtain a polymerization melt;

[0009] S2. Distribute the melt: The polymer melt is transported to the cooler through the melt pipeline under the action of the booster pump. After cooling, the polymer melt is fed into the static mixer for mixing.

[0010] S3, spinning: The melt mixed in the static mixer is introduced into the spinning box, and the temperature of the heat medium in the spinning box is set to 283-287℃.

[0011] S3. Melt extrusion: The melt is quantitatively extruded to the spinneret by the metering pump in the spinning box, and then ejected through the spinneret holes on the spinneret to form a fine stream of melt.

[0012] S4. The melt stream is cooled by an internal and external bidirectional cooling ring blowing device to form raw silk. The control ring blowing air conditioning air pressure is 740±30Pa, the cooling air pressure is 30-40Pa, the air temperature is 21±2℃, and the air humidity is ≥80%.

[0013] S5. Oiling: Apply oil to the raw silk assembly through the oil nozzle.

[0014] S6. After the oiled raw silk group passes through the GR0 guide plate, hot roller, GR1 guide plate, GR2 guide plate, main network device and GR3 guide plate for hot drawing and shaping, it is wound into fine denier semi-dull fully drawn yarn by a fully automatic winding equipment. The guide speed is 2500~2550m / min, the hot roller temperature is set to 145℃, and the hot box outlet tension is 11cN.

[0015] The equipment for producing fine denier semi-dull fully drawn yarn uses the above-mentioned production process for spinning. It includes a polyester final polymerization reactor, melt distribution device, melt conveying device, cooler, static mixer, spinning box, spinneret, metering pump, ring air conditioner, internal and external bidirectional cooling ring air device, oil nozzles, hot drawing device, fully automatic winding equipment, and automatic doffing equipment. The inner wall of the spinneret has four sets of spinneret structures. In a top view, each set of spinneret structures is evenly distributed circumferentially around the center of the spinneret. Gaps are provided on the inner wall of the spinneret between adjacent sides of the four sets of spinneret structures and between the sides of the four sets of spinneret structures facing the center of the spinneret. Each spinneret structure consists of multiple sets of equally spaced spinnerets. The spinneret is composed of a wire hole. The inner and outer bidirectional cooling ring blowing device is fixedly connected to the lower wall of the spinneret. The inner and outer bidirectional cooling ring blowing device includes: an outer connecting seat, which is fixedly connected to the lower wall of the spinneret. Flanges are provided on the outer walls of the opposite ends of the outer connecting seat and the spinneret. The two flanges are fixedly connected by bolts. The outer connecting seat and the spinneret are fixedly connected by two flanges; an outer cylinder shell and an outer cylinder inner liner. The outer cylinder shell is threadedly connected to the outer wall of the outer connecting seat at the end away from the spinneret. A baffle is fixedly connected to the inner side wall of the outer cylinder shell at the end near the outer connecting seat. A bottom shell is threadedly connected to the end of the outer cylinder shell away from the outer connecting seat. The outer cylinder inner liner is snapped between the baffle and the bottom shell. Located inside the outer shell, the outer wall of the bottom shell and the inner wall of the outer shell form an outer cylinder air distribution cavity; an inner connecting seat, which is fixedly connected to the inner wall of the outer connecting seat by four sets of connecting plates and located at the end facing the spinneret. The four sets of connecting plates are evenly distributed in a circle with the center of the inner connecting seat as the center in the top view. The top view size of the inner connecting seat and the four sets of connecting plates is smaller than the top view size of the gap between the four sets of spinneret structures on the spinneret. A ventilation cavity is provided inside the inner connecting seat, and ventilation holes communicating with the ventilation cavity are provided on the inner walls of the four sets of connecting plates; an inner shell and an inner cylinder liner, the inner shell being threadedly connected to the end of the inner connecting seat away from the spinneret; the inner shell... The inner cylinder has threaded end caps on its inner sidewalls and near both the top and bottom ends. The inner cylinder liner is threaded between the two sets of end caps and located inside the inner cylinder shell. An inner cylinder air distribution cavity is formed between the outer wall of the inner cylinder liner and the inner sidewall of the inner cylinder shell. The upper end of the inner cylinder liner is connected to the ventilation cavity, and the end of the inner cylinder liner away from the ventilation cavity is not connected. A uniform air distribution structure is used to evenly deliver the cooling air supplied by the ring-blown air conditioner. The uniform air distribution structure is located inside the uniform air distribution cavity of the outer cylinder and the uniform air distribution cavity of the inner cylinder. A sealing structure is used to seal the connection between the outer connecting seat and the spinneret. The sealing structure is located between the outer connecting seat and the spinneret. A heat insulation structure is used to protect the sealing structure. The heat insulation structure is located between the outer connecting seat and the spinneret.

[0016] Preferably, the outer wall of the outer connecting seat is connected to the ring blower air conditioner through multiple sets of first connectors, and the outer wall of the outer cylinder shell is connected to the ring blower air conditioner through multiple sets of second connectors.

[0017] Preferably, each of the four sets of connecting plates has a third connector fixedly connected to its lower wall. The third connector is connected to the first connector through a pipe. The ventilation cavity of the inner wall of the inner connecting seat is connected to the air-blowing air conditioner through a ventilation hole, the third connector, the pipe, and the first connector.

[0018] Preferably, the air distribution structure includes a first air distribution net and a second air distribution net. The first air distribution net and the second air distribution net are respectively disposed on the inner side wall of the air distribution cavity of the outer cylinder and the inner side wall of the air distribution cavity of the inner cylinder. The first air distribution net and the second air distribution net are both composed of four layers of 40-50 mesh metal filter screens and four layers of 250 mesh metal filter screens in alternating combinations.

[0019] Preferably, the outer cylinder liner, the inner cylinder shell, and the circumferential sidewall of the inner cylinder liner are all provided with multiple sets of air blowing structures that are interconnected inside and out. The multiple sets of air blowing structures are arranged at equal intervals from top to bottom. The uppermost set of air blowing structures in the outer cylinder liner, the inner cylinder shell, and the inner cylinder liner has the same horizontal height. The air blowing structure is composed of air blowing holes distributed in a circle.

[0020] Preferably, the sealing structure includes a sealing ring and a first annular groove, the first annular groove being disposed on the side of the outer connecting seat facing the spinneret, and the sealing ring being disposed on the inner sidewall of the first annular groove.

[0021] Preferably, the heat insulation structure includes a heat insulation felt ring and a second annular groove. The second annular groove is disposed on the side of the spinneret facing the outer connecting seat and corresponds vertically to the sealing structure. The heat insulation felt ring is disposed on the inner side wall of the second annular groove, and the lower wall of the heat insulation felt ring abuts against the sealing structure.

[0022] (III) Beneficial Effects

[0023] This invention provides a process and equipment for producing fine denier semi-dull fully drawn yarn. It has the following beneficial effects:

[0024] 1. Compared with existing technologies, this fine denier semi-dull fully drawn yarn production process sets the hot roller temperature to 145℃, the hot box outlet tension to 11cN, and the area of ​​the yarn bundle in contact with the hot roller is larger, resulting in uniform heating of the yarn and a fiber boiling water shrinkage rate of 6-7%. This is a significant improvement over conventional products on the market, making the fabric soft, smooth, evenly dyed, and brightly colored, thus significantly enhancing the product's grade.

[0025] 2. Compared with existing technologies, this fine denier semi-dull fully drawn yarn production equipment uses an internal and external bidirectional cooling ring blowing device to cool the yarn bundle simultaneously from both inside and outside during cooling. The uniform air structure consists of four layers of 40-50 mesh filters and four layers of 250 mesh filters. The cross-coarse and fine settings allow the cooling air to cool the yarn bundle more evenly and stably, truly achieving 360° cooling without dead angles. Moreover, impurities and oil stains in the cooling air can also be fully filtered out, resulting in better yarn bundle cooling effect and uniform cooling of the yarn bundle, avoiding uneven dyeing caused by inadequate yarn bundle cooling. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a top view schematic diagram of the spinneret structure of the present invention;

[0028] Figure 3 This is a partial sectional view of the connection structure between the spinneret, the outer connecting seat, and the outer shell of the present invention.

[0029] Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle;

[0030] Figure 5 For the present invention Figure 3 A magnified view of a section at point B in the middle;

[0031] Figure 6 This is a schematic diagram of the connection structure of the internal connecting seat and connecting plate of the present invention.

[0032] The components are as follows: 1. Spinneret; 2. Outer connector; 3. Flange; 4. Outer shell; 5. Bottom shell; 6. First connector; 7. Second connector; 8. Spinneret hole; 9. Baffle; 10. Outer inner liner; 11. First air distribution mesh; 12. Inner connector; 13. Inner shell; 14. End cap; 15. Inner liner; 16. Second air distribution mesh; 17. First annular groove; 18. Sealing ring; 19. Second annular groove; 20. Heat insulation felt ring; 21. Connecting plate; 22. Third connector; 23. Air blowing hole. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example:

[0035] likeFigures 1 to 6 As shown, this embodiment of the invention provides a production equipment for fine denier semi-dull fully drawn yarn, including a polyester final polymerization reactor, a melt distribution device, a melt conveying device, a cooler, a static mixer, a spinning box, a spinneret 1, a metering pump, a ring air conditioner, an internal and external bidirectional cooling ring air blowing device, an oil nozzle, a hot drawing device, a fully automatic winding device, and an automatic doffing device. The inner wall of the spinneret 1 is provided with four sets of spinneret structures. In a top view, the four sets of spinneret structures are evenly distributed in a circle with the center of the spinneret 1 as the center. The inner wall of the spinneret 1 is located between adjacent sides of the four sets of spinneret structures. There are gaps between the four sets of spinnerets facing the center of the spinneret plate 1. The spinneret structure is composed of multiple sets of equally spaced spinneret holes 8. The inner and outer bidirectional cooling ring blowing device is fixedly connected to the lower wall of the spinneret plate 1. The inner and outer bidirectional cooling ring blowing device includes: outer connecting seat 2, outer cylinder shell 4, outer cylinder inner liner 10, inner cylinder shell 13, inner cylinder inner liner 15, inner connecting seat 12, a uniform air distribution structure for evenly delivering the cooling air supplied by the ring blowing air conditioner, a sealing structure for sealing when the outer connecting seat 2 is connected to the spinneret plate 1, and a heat insulation structure for protecting the sealing structure.

[0036] The external connecting seat 2 is fixedly connected to the lower wall of the spinneret 1. Flanges 3 are provided on the outer walls of the opposite ends of the external connecting seat 2 and the spinneret 1. The two flanges 3 are fixedly connected by bolts. The external connecting seat 2 and the spinneret 1 are fixedly connected by two flanges 3. By setting the external connecting seat 2, the windless area between the cooling air and the spinneret 1 can be appropriately increased to avoid the cooling air affecting the temperature of the spinneret 1.

[0037] The outer cylinder shell 4 is threadedly connected to the outer wall of the outer connecting seat 2 at the end away from the spinneret 1. A baffle 9 is fixedly connected to the inner wall of the outer cylinder shell 4 at the end near the outer connecting seat 2. A bottom shell 5 is threadedly connected to the end of the outer cylinder shell 4 away from the outer connecting seat 2. The outer cylinder inner liner 10 is snapped between the baffle 9 and the bottom shell 5 and is located inside the outer cylinder shell 4. An outer cylinder air distribution cavity is formed between the outer wall of the bottom shell 5 and the inner wall of the outer cylinder shell 4. The inner connecting seat 12 is fixedly connected to the inner wall of the outer connecting seat 2 by four sets of connecting plates 21 at the end facing the spinneret 1. The connecting plates 21 are evenly distributed in a circle with the center of the inner connecting seat 12 as the center in the top view projection. The top view projection size of the inner connecting seat 12 and the four sets of connecting plates 21 is smaller than the top view projection size of the gap between the four sets of spinnerets on the spinneret 1. The inner connecting seat 12 is provided with a ventilation cavity. The inner sidewalls of the four sets of connecting plates 21 are provided with ventilation holes that communicate with the ventilation cavity. During spinning, because the gap between the spinnerets is larger than the inner connecting seat 12 and the connecting plates 21, the ejected melt stream can avoid the inner connecting seat 12 and the connecting plates 21 and will not stick to them.

[0038] The outer wall of the outer connecting seat 2 is connected to the ring air conditioner through multiple sets of first connecting heads 6. The outer wall of the outer cylinder shell 4 is connected to the ring air conditioner through multiple sets of second connecting heads 7. The lower walls of the four sets of connecting plates 21 are all fixedly connected with third connecting heads 22. The third connecting heads 22 are connected to the first connecting heads 6 through pipes. The ventilation cavity of the inner wall of the inner connecting seat 12 is connected to the ring air conditioner through ventilation holes, third connecting heads 22, pipes and first connecting heads 6. The ring air conditioner supplies air to the outer cylinder uniform air cavity through the air supply pipe and multiple sets of second connecting heads 7, and supplies air to the inner cylinder uniform air cavity through the first connecting head 6, pipes, second connecting heads 7, ventilation holes and ventilation cavity.

[0039] The inner cylinder shell 13 is threaded to the end of the inner connecting seat 12 away from the spinneret 1. End caps 14 are threaded to the inner sidewall of the inner cylinder shell 13 near both the top and bottom ends. The inner cylinder liner 15 is threaded between the two sets of end caps 14 and located inside the inner cylinder shell 13. An inner cylinder air distribution cavity is formed between the outer wall of the inner cylinder liner 15 and the inner sidewall of the inner cylinder shell 13. The upper end of the inner cylinder liner 15 is connected to the ventilation cavity, while the end of the inner cylinder liner 15 away from the ventilation cavity is not connected. The outer cylinder liner 10, the inner cylinder shell 13, and the inner cylinder... The inner liner 15 has multiple sets of air blowing structures that are connected inside and out on the circumferential sidewalls. The multiple sets of air blowing structures are arranged at equal intervals from top to bottom. The uppermost set of air blowing structures in the outer cylinder inner liner 10, inner cylinder shell 13 and inner cylinder inner liner 15 are at the same horizontal height. The air blowing structure is composed of air blowing holes 23 distributed in a circle. The cooling air supplied by the air uniform cavity of the outer cylinder and the air uniform cavity of the inner cylinder is blown to the filament bundle through the air blowing holes 23 on the outer cylinder inner liner 10 and the inner cylinder inner liner 15, respectively, to achieve a true circumferential air blowing cooling effect.

[0040] The uniform air distribution structure is set inside the uniform air distribution cavity of the outer cylinder and the uniform air distribution cavity of the inner cylinder. The uniform air distribution structure includes a first uniform air distribution net 11 and a second uniform air distribution net 16. The first uniform air distribution net 11 and the second uniform air distribution net 16 are respectively set on the inner side wall of the uniform air distribution cavity of the outer cylinder and the inner side wall of the uniform air distribution cavity of the inner cylinder. The first uniform air distribution net 11 and the second uniform air distribution net 16 are both composed of four layers of 40-50 mesh metal filter screens and four layers of 250 mesh metal filter screens in an alternating combination. During cooling, the inner and outer bidirectional cooling ring blowing device is used to cool the yarn bundle from both inside and outside at the same time. The uniform air distribution structure is composed of four layers of 40-50 mesh filter screens and four layers of 250 mesh filter screens. The cross-setting of coarse and fine meshes makes the cooling air more uniform and stable to cool the yarn bundle. Moreover, impurities and oil stains in the cooling air can also be fully filtered out, resulting in better cooling effect of the yarn bundle. The yarn bundle can be cooled evenly, avoiding the phenomenon of uneven dyeing caused by insufficient cooling of the yarn bundle.

[0041] A sealing structure is provided between the outer connecting seat 2 and the spinneret 1. The sealing structure includes a sealing ring 18 and a first annular groove 17. The first annular groove 17 is provided on the side of the outer connecting seat 2 facing the spinneret 1. The sealing ring 18 is provided on the inner side wall of the first annular groove 17. The sealing ring 18 can prevent air leakage between the outer connecting seat 2 and the spinneret 1.

[0042] A heat insulation structure is installed between the outer connecting seat 2 and the spinneret 1. The heat insulation structure includes a heat insulation felt ring 20 and a second annular groove 19. The second annular groove 19 is located on the side of the spinneret 1 facing the outer connecting seat 2 and corresponds vertically to the sealing structure. The heat insulation felt ring 20 is located on the inner side wall of the second annular groove 19. The lower wall of the heat insulation felt ring 20 abuts against the sealing structure. The heat insulation felt ring 20 can prevent the sealing ring 18 from directly contacting the spinneret 1, which would cause high-temperature failure and improve the service life of the sealing ring 18.

[0043] The production process for fine denier semi-dull fully drawn yarn uses the aforementioned production equipment for spinning and includes the following steps:

[0044] S1, Polymerization melt: Raw materials are added to a polyester final polymerization reactor and melted to obtain a polymerization melt;

[0045] S2. Distribute the melt: The polymer melt is transported to the cooler through the melt pipeline under the action of the booster pump. After cooling, the polymer melt is fed into the static mixer for mixing.

[0046] S3, spinning: The melt mixed in the static mixer is introduced into the spinning box, and the temperature of the heat medium in the spinning box is set to 283-287℃.

[0047] S3. Melt extrusion: The melt is quantitatively extruded to the spinneret 1 by the metering pump in the spinning box, and then ejected through the spinneret holes 8 on the spinneret 1 to form a fine stream of melt.

[0048] S4. The melt stream is cooled by an internal and external bidirectional cooling ring blowing device to form raw silk. The air pressure of the control ring blowing air conditioner is 740±30Pa, the cooling air pressure is 30-40Pa, the air temperature is 21±2℃, and the air humidity is ≥80%. Through the internal and external bidirectional cooling ring blowing device, the silk bundle can be cooled evenly, avoiding uneven dyeing caused by insufficient cooling of the silk bundle.

[0049] S5. Oiling: Apply oil to the raw silk assembly through the oil nozzle.

[0050] S6. After the oiled raw silk group passes through the GR0 guide plate, hot roller, GR1 guide plate, GR2 guide plate, main network device and GR3 guide plate for hot stretching and setting, it is then wound into fine denier semi-dull fully stretched yarn by a fully automatic winding device. The guide speed is 2500-2550m / min, the hot roller temperature is set to 145℃, and the hot box outlet tension is 11cN. By optimizing the stretching and setting process conditions, the fibers are woven into fabric with a certain softness and smoothness, and the fabric is bright and colorful with uniform color stripes.

[0051] Working principle: During spinning, because the gap between the spinnerets is larger than that between the inner connecting seat 12 and the connecting plate 21, the ejected molten fine stream can avoid the inner connecting seat 12 and the connecting plate 21 and will not stick to them. The air conditioner supplies air to the outer cylinder air distribution chamber through the air supply pipe and multiple sets of second connectors 7, and supplies air to the inner cylinder air distribution chamber through the first connector 6, pipe, second connector 7, ventilation hole and ventilation chamber. The cooling air supplied to the outer cylinder air distribution chamber and the inner cylinder air distribution chamber is blown onto the yarn bundle through the air blowing holes 23 on the outer cylinder inner liner 10 and the inner cylinder inner liner 15, respectively, to achieve a true circumferential air blowing cooling effect. During cooling, a bidirectional cooling ring air blowing device is used. The filament bundle is cooled simultaneously from both the inside and outside. The uniform airflow structure consists of four layers of 40-50 mesh filters and four layers of 250 mesh filters. The cross-grid arrangement of the coarse and fine filters ensures that the cooling air can cool the filament bundle more evenly and stably. Moreover, impurities and oil stains in the cooling air can be fully filtered out, resulting in better cooling effect and uniform cooling of the filament bundle. This avoids uneven dyeing caused by inadequate cooling of the filament bundle. The sealing ring 18 can prevent air leakage between the outer connecting seat 2 and the spinneret 1. The heat insulation felt ring 20 can prevent the sealing ring 18 from directly contacting the spinneret 1, which could lead to high-temperature failure and improve the service life of the sealing ring 18.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. 。

Claims

1. A production process for fine denier semi-dull fully drawn yarn, characterized by: The process includes the following steps: S1, Polymerization melt: Raw materials are added to a polyester final polymerization reactor and melted to obtain a polymerization melt; S2. Distribute the melt: The polymer melt is transported to the cooler through the melt pipeline under the action of the booster pump. After cooling, the polymer melt is fed into the static mixer for mixing. S3, spinning: The melt mixed in the static mixer is introduced into the spinning box, and the temperature of the heat medium in the spinning box is set to 283-287℃. S4. Melt extrusion: The melt is quantitatively extruded to the spinneret (1) by the metering pump in the spinning box, and is ejected through the spinneret holes (8) on the spinneret (1) to form a fine stream of melt. S5. The melt stream is cooled by an internal and external bidirectional cooling ring blowing device to form raw silk. The control ring blowing air conditioning air pressure is 740±30Pa, the cooling air pressure is 30-40Pa, the air temperature is 21±2℃, and the air humidity is ≥80%. S6. Oiling: Apply oil to the raw silk assembly through the oil nozzle. S7. After the oiled raw silk group passes through the GR0 guide plate, hot roller, GR1 guide plate, GR2 guide plate, main network device and GR3 guide plate for hot drawing and shaping, it is then wound into fine denier semi-dull fully drawn yarn by a fully automatic winding equipment. The guide speed is 2500-2550m / min, the hot roller temperature is set to 145℃, and the hot box outlet tension is 11cN. The fine denier semi-dull fully drawn yarn production equipment adopts the fine denier semi-dull fully drawn yarn production process for spinning, including a polyester final polymerization kettle, melt distribution device, melt conveying device, cooler, static mixer, spinning box, spinneret (1), metering pump, ring air conditioner, internal and external bidirectional cooling ring air blowing device, oil nozzle, hot drawing device, fully automatic winding equipment and automatic doffing equipment. The inner wall of the spinneret (1) is provided with four sets of spinneret structures. The four sets of spinneret structures are evenly distributed in a circle with the center of the spinneret (1) as the center in the top view. The inner wall of the spinneret (1) is provided with gaps between the sides of the four sets of spinneret structures adjacent to each other and between the sides of the four sets of spinneret structures facing the center of the spinneret (1). The spinneret structure is composed of multiple sets of equally spaced spinneret holes (8). The internal and external bidirectional cooling ring air blowing device is fixedly connected to the lower wall of the spinneret (1). The internal and external bidirectional cooling ring air blowing device includes: An outer connecting seat (2) is fixedly connected to the lower wall of the spinneret (1). Flanges (3) are provided on the opposite outer walls of the outer connecting seat (2) and the spinneret (1). The two flanges (3) are fixedly connected by bolts. The outer connecting seat (2) and the spinneret (1) are fixedly connected by two flanges (3). An outer cylinder shell (4) and an outer cylinder inner liner (10) are also provided. The outer cylinder shell (4) is threadedly connected to the outer wall of the outer connecting seat (2) away from the spinneret (1). A baffle (9) is fixedly connected to the inner wall of the outer cylinder shell (4) near the outer connecting seat (2). A bottom shell (5) is threadedly connected to the outer cylinder shell (4) away from the outer connecting seat (2). The outer cylinder inner liner (10) is snapped between the baffle (9) and the bottom shell (5) and located inside the outer cylinder shell (4). An outer cylinder air distribution cavity is formed between the outer wall of the bottom shell (5) and the inner wall of the outer cylinder shell (4); The inner connecting seat (12) is fixedly connected to the inner wall of the outer connecting seat (2) by four sets of connecting plates (21) and located at one end facing the spinneret (1). The four sets of connecting plates (21) are evenly distributed in a circle with the center of the inner connecting seat (12) as the center in the top view projection. The top view projection size of the inner connecting seat (12) and the four sets of connecting plates (21) is smaller than the top view projection size of the gap between the four sets of spinneret structures on the spinneret (1). The inner connecting seat (12) is provided with a ventilation cavity. The inner walls of the four sets of connecting plates (21) are provided with ventilation holes that communicate with the ventilation cavity. The inner cylinder shell (13) and the inner cylinder liner (15) are provided. The inner cylinder shell (13) is threaded to the end of the inner connecting seat (12) away from the spinneret (1). The inner sidewall of the inner cylinder shell (13) and near the upper and lower ends are threaded with end caps (14). The inner cylinder liner (15) is threaded between the two sets of end caps (14) and located inside the inner cylinder shell (13). The outer wall of the inner cylinder liner (15) and the inner sidewall of the inner cylinder shell (13) form an inner cylinder air distribution cavity. The upper end of the inner cylinder liner (15) is in communication with the ventilation cavity. The end of the inner cylinder liner (15) away from the ventilation cavity is not in a through-hole state. A uniform air distribution structure is used to uniformly deliver the cooling air supplied by the ring blower air conditioner. The uniform air distribution structure is set inside the outer cylinder air distribution cavity and the inner cylinder air distribution cavity. A sealing structure is used to seal the connection between the outer connecting seat (2) and the spinneret (1). The sealing structure is set between the outer connecting seat (2) and the spinneret (1). A heat insulation structure for protecting the sealing structure is provided between the outer connecting seat (2) and the spinneret (1).

2. The production process of fine denier semi-dull fully drawn yarn according to claim 1, characterized in that: The outer wall of the outer connecting seat (2) is connected to the ring blower air conditioner through multiple sets of first connectors (6), and the outer wall of the outer cylinder shell (4) is connected to the ring blower air conditioner through multiple sets of second connectors (7).

3. The production process of fine denier semi-dull fully drawn yarn according to claim 2, characterized in that: The lower walls of the four sets of connecting plates (21) are all fixedly connected with a third connector (22). The third connector (22) is connected to the first connector (6) through a pipe. The ventilation cavity of the inner wall of the inner connecting seat (12) is connected to the ring air conditioner through the ventilation hole, the third connector (22), the pipe and the first connector (6).

4. The production process of fine denier semi-dull fully drawn yarn according to claim 3, characterized in that: The uniform air structure includes a first uniform air mesh (11) and a second uniform air mesh (16). The first uniform air mesh (11) and the second uniform air mesh (16) are respectively disposed on the inner side wall of the uniform air cavity of the outer cylinder and the inner side wall of the uniform air cavity of the inner cylinder. The first uniform air mesh (11) and the second uniform air mesh (16) are both composed of four layers of 40-50 mesh metal filter screens and four layers of 250 mesh metal filter screens in alternating combinations.

5. The production process of fine denier semi-dull fully drawn yarn according to claim 4, characterized in that: The outer cylinder inner liner (10), inner cylinder shell (13) and inner cylinder inner liner (15) are all provided with multiple sets of air blowing structures that are connected inside and outside. The multiple sets of air blowing structures are arranged at equal intervals from top to bottom. The uppermost set of air blowing structures in the outer cylinder inner liner (10), inner cylinder shell (13) and inner cylinder inner liner (15) has the same horizontal height. The air blowing structure is composed of air blowing holes (23) distributed in a circle.

6. The production process of fine denier semi-dull fully drawn yarn according to claim 5, characterized in that: The sealing structure includes a sealing ring (18) and a first annular groove (17). The first annular groove (17) is located on the side of the outer connecting seat (2) facing the spinneret (1), and the sealing ring (18) is located on the inner sidewall of the first annular groove (17).

7. The production process for fine denier semi-dull fully drawn yarn according to claim 6, characterized in that: The heat insulation structure includes a heat insulation felt ring (20) and a second annular groove (19). The second annular groove (19) is located on the side of the spinneret (1) facing the outer connecting seat (2) and corresponds vertically to the sealing structure. The heat insulation felt ring (20) is located on the inner side wall of the second annular groove (19), and the lower wall of the heat insulation felt ring (20) abuts against the sealing structure.

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