Polypropylene and polyester composite filament geotextile production equipment

Abstract

The utility model relates to a kind of polypropylene and polyester composite filament geotextile production equipment, belong to composite filament production field, to solve the reduction side cold air wind speed to avoid the wrapping of filament bundle, although it can reduce the filament winding phenomenon, but the penetration ability of cooling air is greatly reduced, part of filament bundle solidification is insufficient, subsequent drawing, needle punching process is prone to broken filament, breakage and other problems, simultaneously, extend filament bundle solidification time, affect production efficiency Problem, a kind of polypropylene and polyester composite filament geotextile production equipment, including sheath-core composite spinneret, by air pipe generates larger vertical downward airflow, hot air in the air outlet pipe and air pressure pipe inside is rapidly taken away, simultaneously, wind wall is formed between the filament after cooling, to effectively avoid the secondary softening of filament caused by hot air retention, and prevent multiple filament from sticking together or wrapping together in cooling process, maintain the vertical state and independent separation of filament.

Description

Technical Field

[0001] This invention relates to the field of composite yarn production, and in particular to a production equipment for geotextile made of polypropylene and polyester composite yarns. Background Technology

[0002] In the production process of PP core and PET sheath composite filament geotextile, the spinning process is one of the core links. After the sheath-core composite spinning component extrudes PP melt and PET melt to form composite filament bundles, the filament bundles are in a high-temperature molten state and need to be cooled and cooled immediately to solidify and shape the filament bundles quickly. This is necessary to ensure the smooth progress of subsequent processes such as web laying and needle punching, and thus ensure that the key properties of the geotextile, such as strength and toughness, meet the standards.

[0003] Currently, the industry commonly uses side-blowing cooling air to dissipate heat from the spun composite filaments. This method is simple in structure and low in cost. Cooling air is blown to the side of the filaments through a side-blowing device, and the heat is removed from the surface of the filaments through heat exchange, thus achieving filament curing. However, due to the differences in thermal shrinkage rate and melting point between PP core and PET sheath, and the need for multiple spinnerets to operate simultaneously during the spinning process to form a dense array of filaments, the existing side-blowing cooling method has insurmountable technical drawbacks.

[0004] Specifically, to ensure heat dissipation efficiency, the airflow velocity of the side cooling air needs to be increased so that the cooling air can penetrate the dense array of filaments and carry away the heat from the PP core inside the filaments. This avoids problems such as PET outer sheath cooling and solidifying first, while the PP core cools later, leading to sheath-core slippage and core exposure. However, excessive airflow velocity will generate strong airflow disturbances, causing adjacent composite filaments to become entangled and knotted, forming strands and fuzz. This not only affects the forming quality of the filaments but also leads to uneven subsequent web laying, reducing the overall performance of the geotextile.

[0005] Reducing the side airflow velocity to prevent filament entanglement can decrease the amount of filament winding, but it also significantly reduces the cooling airflow's penetration ability, making it unable to quickly remove heat from the surface and interior of the filaments, thus lowering heat dissipation efficiency. This is especially true in the densely packed filaments, where cold air struggles to penetrate, leading to uneven cooling and incomplete curing of some filaments. This can cause filament breakage and damage during subsequent drawing and needle punching processes, while also prolonging the curing time and impacting production efficiency.

[0006] In summary, the existing side-cooled air heat dissipation method cannot balance heat dissipation efficiency and yarn forming quality, has a contradiction in wind speed adjustment, and is difficult to adapt to the heat dissipation requirements of PP core PET skin composite yarn, thus restricting the improvement of composite yarn geotextile product quality and production efficiency.

[0007] To address the aforementioned problems, a production equipment for geotextiles made of polypropylene and polyester composite fibers is proposed. Summary of the Invention

[0008] The purpose of this invention is to provide a production equipment for polypropylene and polyester composite filament geotextiles. This equipment solves the problem of reducing the side cooling air velocity to avoid filament entanglement. While this reduces filament entanglement, it significantly decreases the penetration ability of the cooling air, making it unable to quickly remove heat from the surface and interior of the filaments, thus reducing heat dissipation efficiency. Especially in the densely packed filaments, the cooling air has difficulty penetrating, leading to uneven cooling and insufficient curing of some filaments. This results in problems such as filament breakage and damage during subsequent drawing and needle punching processes, while also prolonging the curing time and affecting production efficiency.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a polypropylene and polyester composite filament geotextile production equipment, comprising a core-sheath composite spinneret, a spinneret plate disposed at the lower end of the core-sheath composite spinneret, spinneret holes disposed inside the spinneret plate, a blower fixedly connected to one side of the core-sheath composite spinneret, an air outlet mechanism disposed below the spinneret plate, multiple air outlet pipes disposed below the air outlet mechanism, an air guide mechanism disposed below the air outlet pipes, and an air guide pipe disposed below the air guide mechanism. The central axis of the air outlet duct is on the same vertical line as the central axis of the spinneret hole. The air outlet mechanism is used to deliver cooling air into the air outlet duct and form a rotating airflow inside the air outlet duct, which drives the wire to rotate during the cooling process and form a spiral structure. The air guide mechanism is used to generate a vertically downward airflow, which quickly carries away the hot air inside the air outlet duct and forms an air wall between the cooled wires.

[0010] Preferably, the air outlet mechanism includes a first air inlet pipe connected to the output end of the blower, a second air inlet pipe connected to one end of the first air inlet pipe, a guide plate fixedly connected to the lower surface of the second air inlet pipe, and an air inlet pipe connected to the inner side of the guide plate and communicating with the air outlet pipe. The air inlet duct is connected to an exhaust duct located inside the air guide plate on the side away from the blower. The inner wall of the air outlet duct is connected to the first air guide hole near the spinneret hole.

[0011] Preferably, multiple second air inlet pipes are equidistantly arranged on the first air inlet pipe, and the spacing between the second air inlet pipes is consistent with the spacing between the spinneret holes, so that the air outlet pipe corresponding to each spinneret hole can independently receive the initial cold air.

[0012] Preferably, the first air guide holes are equidistantly distributed on the inner side of the air outlet pipe, and the central axis of the first air guide holes is inclined to the central axis of the air outlet pipe, so as to form a rotating airflow on the inner side of the air outlet pipe and drive the wire to rotate during the cooling process.

[0013] Preferably, the air guiding mechanism includes a compressed air pipe connected to the side of the air guiding tube near the spinneret hole, and a pulling air pipe connected to the lower end of the air guiding tube; The lower inner surface of the air outlet duct is provided with a second air guide hole that communicates with the air guide duct; A windproof plate is fixedly connected to the outside of the air duct.

[0014] Preferably, the central axis of the compressed air pipe is inclined to the central axis of the spinneret hole to generate cold air that is inclined toward the center of the yarn, which counteracts the rotating airflow of the yarn and consumes the kinetic energy of the yarn's revolution and oscillation.

[0015] Preferably, the lower central axis of the air duct is parallel to the central axis of the spinneret hole, which is used to generate a vertically downward airflow to quickly carry away the hot air inside the air outlet duct and the air compressor duct.

[0016] Preferably, the lower end face of the air-drawing duct is closer to the spinneret hole than the end face of the air-compressing duct that is closer to the spinneret hole, so as to enable the vertically downward airflow to more comprehensively control the upward movement trajectory of the cold air.

[0017] Preferably, the cross-sectional area of ​​the lower end face of the air extraction duct is smaller than the cross-sectional area of ​​the end face of the air compressor duct near the spinneret hole, so as to generate greater air pressure in the air extraction duct and enhance the extraction effect.

[0018] Preferably, the top view of the air outlet duct is rectangular, and multiple air compressor ducts are symmetrically arranged on the air guide duct to form a uniform centripetal pressure field around the silk thread, reducing the risk of misalignment of the core-skin structure.

[0019] 1. Compared with the prior art, the beneficial effects of the present invention are: by using the first air guide holes that are inclined and equidistantly distributed on the inner wall of the air outlet pipe, the cooling air forms a rotating airflow, which drives the yarn to rotate and form a spiral structure during the cooling process, thereby enhancing the interlocking between the yarns, making the fiber entanglement more compact after subsequent web laying and needle punching. The resulting geotextile has improved tensile strength, tear strength and creep resistance, and is more suitable for core application requirements such as reinforcement and protection.

[0020] 2. The present invention provides multiple air outlet pipes below the air outlet mechanism that correspond one-to-one with the spinneret holes. Each air outlet pipe independently receives the initial cold air from the blower, thereby avoiding the preheating effect of the preceding yarn on the cooling air of the subsequent yarn in the traditional side-blowing method. This ensures that each yarn can receive cooling air at the same temperature, achieving the consistency of cooling effect for the entire batch of yarn.

[0021] 3. This invention generates a large vertical downward airflow through the air duct, which quickly carries away the hot air inside the air outlet duct and the air compressor duct. At the same time, it forms an air wall between the cooled threads, thereby effectively avoiding the secondary softening of the threads caused by the retention of hot air, and preventing multiple threads from sticking together or getting tangled together during the cooling process, thus maintaining the vertical state and independent separation of the threads.

[0022] 4. This invention generates cold air inclined towards the center through four symmetrically arranged compressed air pipes, which counteracts the rotational kinetic energy of the yarn itself, consuming the kinetic energy of the spiral yarn that may be generated during rotation. At the same time, the wind forces in the four directions cancel each other out to form a stable centripetal pressure field, applying wrapping pressure to the yarn, effectively reducing the risk of core-sheath misalignment (core displacement, outer sheath loosening), and improving the structural regularity of the composite yarn.

[0023] 5. The rotating cold air generated by the first air guide hole of this invention makes the surface of the thread in contact with the airflow wider and the cooling more uniform; the vertical exhaust of the air duct removes the hot air in time. The combination of the two avoids the problems of uneven cooling and bending deformation of the thread caused by traditional unilateral air blowing, and ensures the shape stability and quality consistency of the thread during the cooling process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a top view of the spinneret structure of the present invention; Figure 3 This is a top view of the air guide plate structure of the present invention; Figure 4 This is a schematic diagram of the external structure of the air outlet duct of the present invention; Figure 5 This is a top view cross-sectional diagram of the air outlet duct structure of the present invention; Figure 6 This is a schematic diagram of the front cross-sectional structure of the air outlet duct of the present invention; Figure 7 This is a schematic diagram of the appearance structure of the spiral filament of the present invention.

[0025] In the diagram: 1. Sheet-core composite spinneret; 2. Spinneret plate; 3. Spinneret orifice; 4. Blower; 5. Air outlet mechanism; 6. Air outlet duct; 7. Air guide duct; 8. Air guide mechanism; 51. First air inlet duct; 52. Second air inlet duct; 53. Air guide plate; 54. Exhaust duct; 55. First air guide hole; 56. Air inlet duct; 81. Compressed air duct; 82. Pulling air duct; 83. Second air guide hole. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-7This invention provides a technical solution: a polypropylene and polyester composite geotextile production equipment, comprising a core-sheath composite spinneret 1, a spinneret plate 2, spinneret holes 3, a blower 4, an air outlet mechanism 5, an air outlet pipe 6, an air guide mechanism 8, and an air guide pipe 7. The core-sheath composite spinneret 1 is the core forming component of the entire device, used to extrude polypropylene melt and polyester melt to form a core-sheath composite filament bundle; the spinneret plate 2 is located at the lower end of the core-sheath composite spinneret 1, used to install the spinneret holes 3 and guide the filament bundle to be extruded vertically downward; the spinneret holes 3 are located inside the spinneret plate 2, and multiple spinneret holes 3 are arranged in an array to extrude the molten polypropylene and polyester materials. The spinning process forms filaments; the blower 4 is fixedly connected to one side of the core-sheath composite spinneret 1 to provide cooling air; the air outlet mechanism 5 is located below the spinneret 2 to distribute the cooling air delivered by the blower 4 to each air outlet duct 6; the air outlet duct 6 is located below the air outlet mechanism 5, and multiple air outlet ducts 6 correspond one-to-one with the spinneret holes 3. The top view of the air outlet duct 6 is rectangular, and the central axis of the air outlet duct 6 is on the same vertical line as the central axis of the spinneret hole 3; the air guide mechanism 8 is located below the air outlet duct 6 to generate a vertically downward airflow and quickly carry away the hot air; the air guide duct 7 is located below the air guide mechanism 8 to guide the airflow out.

[0028] The air outlet mechanism 5 includes a first air inlet pipe 51, a second air inlet pipe 52, an air guide plate 53, an air inlet pipe 56, and an exhaust pipe 54. The first air inlet pipe 51 is connected to the output end of the blower 4, serving as the main channel for delivering cooling air. One end of the first air inlet pipe 51 is connected to the second air inlet pipe 52. Multiple second air inlet pipes 52 are equidistantly arranged on the first air inlet pipe 51, and the spacing of the second air inlet pipes 52 is consistent with the spacing of the spinneret holes 3. This ensures that the air outlet pipe 6 corresponding to each spinneret hole 3 independently receives the initial cold air, avoiding the traditional side-blowing method. In the formula, the preceding wire has a preheating effect on the cooling air of the subsequent wire. The lower surface of the second air inlet pipe 52 is fixedly connected to the air guide plate 53. The air guide plate 53 has a square appearance and the upper surface of the air guide plate 53 is parallel to the upper surface of the second air inlet pipe 52. This is to ensure that the cooling air is evenly distributed inside the air guide plate 53. The inner side of the air guide plate 53 is connected to the air inlet pipe 56, which is connected to the air outlet pipe 6. The side of the air inlet pipe 56 away from the blower 4 is connected to the exhaust pipe 54 located inside the air guide plate 53, forming a complete cooling air circulation channel.

[0029] The inner wall of the air outlet duct 6 is connected to the side of the spinneret 3 by a first air guide hole 55. The first air guide holes 55 are equidistantly distributed on the inner side of the air outlet duct 6, and the central axis of the first air guide hole 55 is inclined to the central axis of the air outlet duct 6. The lower surface of the inner wall of the air outlet duct 6 is provided with a second air guide hole 83 that is connected to the air guide duct 7, which is used to guide part of the cooling air to the air guide mechanism 8.

[0030] The air guiding mechanism 8 includes a compressed air pipe 81, a pull air pipe 82, and a wind deflector 84. The compressed air pipe 81 is connected to the side of the air guiding pipe 7 near the spinneret hole 3. The central axis of the compressed air pipe 81 is inclined to the central axis of the spinneret hole 3 to generate cold air inclined towards the center of the yarn. The pull air pipe 82 is connected to the lower end of the air guiding pipe 7. The central axis of the lower end of the pull air pipe 82 is perpendicular to the central axis of the spinneret hole 3 to generate vertically downward airflow. The wind deflector 84 is fixedly connected to the outside of the air guiding pipe 7 to prevent external airflow from interfering with the flow path of the cooling air.

[0031] The lower end face of the pull duct 82 is closer to the spinneret 3 than the end face of the pressure duct 81 that is closer to the spinneret 3, so that the vertically downward airflow can more comprehensively control the upward movement trajectory of the cold air. The cross-sectional area of ​​the lower end face of the pull duct 82 is smaller than the cross-sectional area of ​​the end face of the pressure duct 81 that is closer to the spinneret 3, so that the pull duct 82 generates greater air pressure and enhances the ventilation effect.

[0032] When the core-sheath composite spinneret 1 spins the filaments from the spinneret hole 3, causing the filaments to move to the positions of the air outlet duct 6 and the air compressor duct 81, the blower 4 is started to send cold air from the first air inlet duct 51 into the second air inlet duct 52. The cold air then enters the inner side of the air outlet duct 6 through the air inlet duct 56. The air inlet duct 56 and the air outlet duct 54 form an independent air pressure balance circuit inside the air guide plate 53, which guides excess cold air inside the air guide plate 53 and is connected to the cooling air path inside the air outlet duct 6. The air outlet duct 54 serves as... The exhaust channel for the residual air inside the air guide plate 53 is also provided by the air inside the air outlet pipe 6. The air supply for the second air guide hole 83, air guide pipe 7, compressed air pipe 81, and exhaust air pipe 82 is also provided by the air inside the air outlet pipe 6. The cooling air entering the air outlet pipe 6 is divided into two parallel paths: one path is sprayed out from the first air guide hole 55 to form a rotating airflow, and the other path is discharged into the air guide pipe 7 through the second air guide hole 83, and then discharged through the compressed air pipe 81 and exhaust air pipe 82. During this process, the cold air continuously flows inside the air outlet pipe 6.

[0033] An air outlet duct 6 has four first air guide holes 55 inside. The four first air guide holes are evenly distributed circumferentially along the inner wall of the air outlet duct 6, with the same hole diameter and the same inclination angle. They are all arranged in the same direction and in a clockwise tangential direction with an inclination angle of 8°-12°. Only uniform air outlets with the same angle and direction can form a stable rotating airflow. This cannot be achieved by any angle or direction. The four inclined air outlets work together to form a stable circumferential rotating airflow inside the air outlet duct 6. This rotating airflow generates tangential friction with the surface of the wire. When the wire just exits the spinneret and is in a high-temperature melting and plastic stage, it overcomes the surface tension and initial stretching tension of the wire, allowing the wire to complete the spiral plastic deformation before cooling and solidification. As the wire moves downward and gradually cools and solidifies, the spiral shape is fixed, transforming the originally straight wire into a spiral structure.

[0034] The spiral yarn has a continuous, extended spiral shape, similar to a uniformly stretched spring. The yarn has continuous spiral ridges and grooves along its length. During the web laying and needle punching processes, the spiral ridges can interlock, hook, and mesh with the spiral segments of adjacent yarns. Compared to ordinary straight yarns without undulations, the yarns are less prone to slippage and misalignment, and there are more contact constraint points, resulting in tighter fiber entanglement. The improved entanglement tightness directly makes the overall stress on the geotextile more uniform, thereby improving the breaking strength, tear strength, and creep resistance. This makes it more suitable for core applications such as geotextile reinforcement and protection. At the same time, since the cooling air contacts the yarn in a rotating manner, the contact area is wider and the heat exchange efficiency is higher, resulting in better and more uniform cooling of polypropylene and polyester composite yarns.

[0035] When the cold air moves inside the air outlet duct 6, another part of the air is discharged from the second air guide hole 83, enters the air guide duct 7, and is discharged from the compressed air duct 81 and the pull air duct 82. When the cold air is discharged from the pull air duct 82, since the cross-sectional area of ​​the lower end face of the pull air duct 82 is smaller than the cross-sectional area of ​​the end face of the compressed air duct 81 near the spinneret hole 3, according to the principle of fluid continuity, the airflow velocity at the outlet of the pull air duct 82 is higher and the air pressure generated is greater. The force that pushes the air below the pull air duct 82 is stronger, making the pressure of the surrounding air moving towards the pull air duct 82 greater.

[0036] The lower central axis of the air-drawing tube 82 is parallel to the central axis of the spinneret 3, which drives the gas located inside the air outlet tube 6 and the air pressure tube 81 to move vertically downward along the inner side of the air-drawing tube 82. This vertically downward airflow quickly carries away the hot air generated during the cooling process of the yarn, effectively reducing the residence time of hot air around the yarn and avoiding the problem of secondary softening of the yarn caused by the retention of hot air.

[0037] Below each air outlet duct 6 are four air guide ducts 7 and four air pull ducts 82, forming four sets of vertically downward airflow channels. The four sets of vertically downward airflow work together to keep the polypropylene and polyester composite filaments in a vertically downward state inside the air pull duct 82, keeping them straight throughout the cooling process and avoiding bending and deformation of the filaments due to partial turbulence.

[0038] The air discharged from the air outlet pipe 6 inside the air duct 82 forms an air wall between the cooled polypropylene and polyester composite filaments. The air wall acts as a physical isolation barrier, reducing the occurrence of multiple polypropylene and polyester composite filaments sticking together and getting tangled, and maintaining the independent separation of the filaments.

[0039] When the gas inside the air outlet duct 6 and the air compressor duct 81 is discharged from the range of the air pull duct 82, the gas moves vertically downward in the direction of the gas discharge from the air pull duct 82 and is discharged. This avoids the situation where the hot air comes into contact with the polypropylene and polyester composite yarn again, which would cause the yarn to soften again. The symmetrical arrangement of the four air pull ducts 82 makes the airflow form a constrained area around the yarn, avoiding the yarn deviation problem that may be caused by a single air pull duct, and maintaining the vertical state of the yarn.

[0040] In existing side-cooling technology, one side of the yarn is cooled by the airflow while the other side is insufficiently cooled, causing the yarn to bend during the cooling process. At the same time, the cooling air is blocked by the preceding yarn and reaches the subsequent yarn with high heat, resulting in inconsistent cooling and uneven quality within the same batch of yarn. In this device, multiple air outlet pipes 6 are set below the air outlet mechanism 5. The central axis of the air outlet pipe 6 is on the same vertical line as the central axis of the spinneret hole 3. Each spinneret hole 3 corresponds to an independent air outlet pipe 6, so that the cooling air that comes into contact with each yarn is the initial cold air, achieving a consistent cooling effect for the entire batch of yarn. At the same time, the rotating cold air makes the yarn cool evenly on all sides, reducing the occurrence of yarn bending.

[0041] When cold air is discharged from the compressed air pipe 81, the cold air is tilted upward because the central axis of the compressed air pipe 81 is inclined to the central axis of the spinneret hole 3. At the same time, the pull air pipe 82 operates simultaneously, pulling the gas inside the air outlet pipe 6 and the compressed air pipe 81 downward. The lower end face of the pull air pipe 82 is closer to the spinneret hole 3 than the end face of the compressed air pipe 81 that is closer to the spinneret hole 3, so that the vertically downward airflow can more comprehensively control the trajectory of the cold air tilted upward by the compressed air pipe 81, so that the tilted upward cold air moves towards the middle and acts on the outer side of the yarn that has been pushed and rotated by the first air guide hole 55.

[0042] Four compressed air pipes 81 are provided, arranged symmetrically, so that the polypropylene and polyester composite filaments are wrapped by cold air blown evenly from four directions toward the center. At this time, the filaments are pushed by the rotating airflow to form a spiral structure, which has continuous rotational kinetic energy and will maintain a high-speed rotation. The cold air blown evenly from four directions toward the center forms a stable centripetal airflow field, which produces slight collision and friction with the rotating airflow of the filaments. This interaction between airflows consumes the kinetic energy of the spiral filaments that may be generated during the rotation, slows down the rotation speed of the filaments, achieves the energy dissipation effect, and reduces the risk of subsequent spiral filament entanglement.

[0043] Because polypropylene and polyester composite yarns have a core-sheath structure where the polyester outer layer is wrapped around the polypropylene core (or vice versa), the cold air blown from four directions towards the center creates a centripetal pressure field around the yarn: the winds from the left and right cancel each other out, and the winds from the front and back cancel each other out, creating a stable air pressure around the yarn. This centripetal pressure field is equivalent to applying wrapping pressure to the yarn, making the overall shape of the yarn more regular, reducing the risk of core-sheath structure misalignment, effectively avoiding problems such as core displacement and loosening of the outer sheath, and improving the quality of polypropylene and polyester composite yarns.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] 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 equipment for geotextile made of polypropylene and polyester composite yarns, characterized in that, The device includes a core-sheath composite spinneret (1), a spinneret plate (2) located at the lower end of the core-sheath composite spinneret (1), spinneret holes (3) located inside the spinneret plate (2), a blower (4) fixedly connected to one side of the core-sheath composite spinneret (1), an air outlet mechanism (5) located below the spinneret plate (2), multiple air outlet pipes (6) located below the air outlet mechanism (5), an air guide mechanism (8) located below the air outlet pipes (6), and an air guide pipe (7) located below the air guide mechanism (8). The central axis of the air outlet pipe (6) is on the same vertical line as the central axis of the spinneret hole (3); The air outlet mechanism (5) is used to deliver cooling air into the air outlet pipe (6) and form a rotating airflow inside the air outlet pipe (6), driving the wire to rotate during the cooling process to form a spiral structure; The air guide mechanism (8) is used to generate a vertically downward airflow, which quickly carries away the hot air inside the air outlet pipe (6) and forms an air wall between the cooled wires.

2. The polypropylene and polyester composite filament geotextile production equipment according to claim 1, characterized in that, The air outlet mechanism (5) includes a first air inlet pipe (51) connected to the output end of the blower (4), a second air inlet pipe (52) connected to one end of the first air inlet pipe (51), a guide plate (53) fixedly connected to the lower surface of the second air inlet pipe (52), and an air inlet pipe (56) connected to the inner side of the guide plate (53) and connected to the air outlet pipe (6). The air inlet pipe (56) is connected to an exhaust pipe (54) located inside the air guide plate (53) on the side away from the blower (4). The inner wall of the air outlet pipe (6) is connected to the first air guide hole (55) on the side near the spinneret hole (3).

3. The polypropylene and polyester composite filament geotextile production equipment according to claim 2, characterized in that, The second air inlet pipe (52) is provided at equal intervals on the first air inlet pipe (51), and the spacing of the second air inlet pipe (52) is consistent with the spacing of the spinneret holes (3), so that the air outlet pipe (6) corresponding to each spinneret hole (3) can independently receive the initial cold air.

4. The polypropylene and polyester composite filament geotextile production equipment according to claim 2, characterized in that, The first air guide hole (55) is equidistantly distributed on the inner side of the air outlet pipe (6), and the central axis of the first air guide hole (55) is inclined to the central axis of the air outlet pipe (6), which is used to form a rotating airflow on the inner side of the air outlet pipe (6) to drive the wire to rotate during the cooling process.

5. The polypropylene and polyester composite filament geotextile production equipment according to claim 1, characterized in that, The air guiding mechanism (8) includes a compressed air pipe (81) connected to the side of the air guiding pipe (7) near the spinneret hole (3) and a pull air pipe (82) connected to the lower end of the air guiding pipe (7). The lower inner wall surface of the air outlet pipe (6) is provided with a second air guide hole (83) that communicates with the air guide pipe (7). A windproof plate (84) is fixedly connected to the outside of the air duct (7).

6. The polypropylene and polyester composite filament geotextile production equipment according to claim 5, characterized in that, The central axis of the compressed air pipe (81) is inclined to the central axis of the spinneret (3) to generate cold air that is inclined toward the center of the yarn, which counteracts the rotating airflow of the yarn and consumes the kinetic energy of the yarn's revolution and oscillation.

7. The polypropylene and polyester composite filament geotextile production equipment according to claim 5, characterized in that, The lower central axis of the air-drawing pipe (82) is parallel to the central axis of the spinneret hole (3), which is used to generate a vertically downward airflow to quickly carry away the hot air inside the air outlet pipe (6) and the air compressor pipe (81).

8. The polypropylene and polyester composite filament geotextile production equipment according to claim 5, characterized in that, The lower end face of the air-drawing tube (82) is closer to the spinneret hole (3) than the end face of the air-compressing tube (81) that is closer to the spinneret hole (3), so as to make the vertically downward airflow more fully control the upward movement trajectory of the cold air.

9. The polypropylene and polyester composite filament geotextile production equipment according to claim 5, characterized in that, The lower end face of the air-drawing pipe (82) has a smaller cross-sectional area than the end face of the air-compressing pipe (81) near the spinneret hole (3), which is used to generate greater air pressure in the air-drawing pipe (82) and enhance the air extraction effect.

10. The polypropylene and polyester composite filament geotextile production equipment according to claim 5, characterized in that, The top view of the air outlet pipe (6) is rectangular, and multiple air pressure pipes (81) are symmetrically arranged on the air guide pipe (7) to form a uniform centripetal pressure field around the silk thread and reduce the risk of misalignment of the core structure.

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