Production method of ultra-coarse denier monofilament with small number of holes

Abstract

The invention discloses a production method of a few-hole-number super-coarse-denier single filament. The production method comprises the following steps that a spinning melt is subjected to extrusion forming through a spinneret plate; the extrusion-molded tows are cooled through a cooling mechanism; bundling and oiling the cooled tows; enabling the oiled tows to enter a pre-interlacing device; the air pressure of the pre-interlacer is greater than 0.1 MPa; the tows output by the pre-interlacing device sequentially pass through a first hot roller and a second hot roller to be heated, stretched and shaped; enabling the stretched and shaped tows to enter a main interlacer; the air pressure of the main interlacer is greater than 0.3 MPa; the main network device comprises two nozzles which are symmetrically arranged and have a preset included angle; winding the tows output by the main interlacer by using a winding machine; and the surface pressure of the winding machine is set to be greater than 500N. According to the production method of the small-hole-number super-coarse-denier single filament yarn, even cooling can be achieved, network points can be machined, the left side and the right side of the FDY spinning cake are symmetrical, yarn tripping is avoided, and the spinning speed is not affected.

Description

Technical Field

[0001] This specification relates to the technical field of spinning, and particularly to a production method for super thick monofilaments with a small number of holes. Background Art

[0002] Currently, among civil chemical fiber filaments, for super thick monofilaments FDY (Fully Drawn Yarn, also known as fully drawn yarn) with a small number of holes in polyester, the fineness of a single filament generally exceeds 16D, such as 200D / 12f. The fineness of a single filament = 200 / 12 = 16.6. 12 single fiber filaments are compounded into a filament with a fineness of 200D. Due to its special rigidity and toughness, it is generally used for home textile fabrics, luggage fabrics, tent fabrics, etc. If an irregular cross-section (such as flat, wavy flat, etc.) is added, it can also be used for the bristle varieties in the fluff category, with a considerable product premium.

[0003] In principle, it is not easy to cool the super thick FDY variety of a single filament evenly. The distance of the traditional ring blow cooling area is short, generally only about 50 cm, which is sufficient to cool ordinary civil polyester fibers, such as 30D / 24f, 50D / 72f, etc., and the fineness of a single fiber is about 1D. For this special variety with a single fiber fineness exceeding 16D, the required cooling area distance is long, and the traditional ring blow cooling equipment and process cannot achieve the purpose of uniform cooling. Although side blow cooling can achieve the purpose of a long cooling distance, side blow cooling is a single-sided blowing method, which cannot achieve uniform cooling for thick polyester FDY single filaments, resulting in faster cooling on the single-sided blowing side and slower cooling on the back blowing side, leading to a cooling stress difference and unstable internal tension of the filament.

[0004] In fact, when the super thick FDY variety of a single filament passes through the main networker, due to the small number of single filaments, the effect of the conventional networker in increasing network entanglement nodes for the super thick FDY variety of a single filament is very poor, almost ineffective. The conventional main networker is generally a single-hole, single-sided vertical blowing method, and the running path of the filament bundle inside the networker cannot make the super thick monofilaments with a small number of holes form a strong reverse vortex shape, so the formed network entanglement nodes are very few. It is most common to have 1 - 2 networkers per meter, and when the fineness of a single filament exceeds 16D, there are basically no network points. The loose network points lead to easy occurrence of wire entanglement and loop formation during the formation of the bobbin, affecting the subsequent use.

[0005] In the production method of civilian polyester filament, when the tow comes out of the hot roller and enters the main network, the width of the tow is generally 5cm~10cm because the width of the coil formed on the hot roller is expanded to 40cm~60cm on the main network. From the main network, it enters the winding machine. The width of the winding machine from the inner spindle to the outer spindle is generally 120cm~160cm. This determines that when the tow comes down from the main network and enters the winding machine, only the middle spindle enters the machine wire guide hook at a vertical angle, while the spindles at both ends enter the machine wire guide hook at an oblique angle. After the tow enters the machine wire guide hook at an oblique angle, it enters the traverse wire guide, and the tow is moved back and forth by the traverse wire guide to run, and the tow is laid flat on the paper tube.

[0006] In summary, common civil filament production processes and equipment can no longer meet our needs for developing civil filaments with higher differentiated specifications, such as the ultra-coarse denier single filament with a small number of holes and a single fiber fineness of more than 16D to be developed by the present invention. Because this variety is not easy to cool during production due to its special specifications, the single fiber is more than 16D, it is not easy to form a network entanglement node in the network device, it is not easy to form symmetrically and as a whole in the package, and the silk cake forming is prone to serious wire tripping and asymmetrical front and back structures.

[0007] When the silk strip is wound on the bobbin, the silk bundle is driven by the traverse guide and runs from one end of the silk cake to the other end of the silk cake. In this way, a silk strip can be traversed left and right on the paper tube and finally rolled into a cake-shaped bobbin of a certain width. When the silk bundle is traversed at both ends, the silk bundle deviates from the normal winding track and obviously trips on the end surface of the bobbin and becomes a straight line. This phenomenon is called "tripped wire". Figure 1 In the production process of polyester filament, the tripping of the yarn will cause the staggered arrangement of the FDY end yarns to deviate from the normal track, affecting the subsequent weaving and unwinding, and even causing the yarn to break, which needs to be avoided as much as possible. Summary of the invention

[0008] The inventors have found that the causes of wire tripping mainly include three factors: equipment, raw materials and process, as described below: ‌1. Equipment factors‌: The running speed of the traverse guide is unstable. When the traverse guide reciprocates the yarn bundle to the two ends of the yarn cake, the tension is different; the contact pressure between the pressure roller and the yarn cake is small; 2. Raw material factors: The raw material single filament is too thick, and the cooling is uneven, resulting in uneven drafting, large fluctuations in internal stress, and the wire jumping on the traverse wire guide; the single filament is too thick, the wire specific surface area is small, the friction between the wires is small, and it is relatively easy to slide; the bundle of wires with few single filaments has poor cohesion, the wires diverge in parallel, and the bundling is poor. In high-speed winding, the wire bundle at the end of the wire cake will be thrown out, which will also cause the formation of wire tripping; ‌3. Process factors‌: Too large a winding angle or too high a vehicle speed can also cause wire tripping.

[0009] Currently, to solve the problem of filament entanglement, the following measures are generally adopted in terms of process and equipment: In terms of process: 1. Adopt a large winding tension to make the filament bundle run stably on the traversing guide without jumping, that is, bind the filament bundle with tension to make the filament bundle traverse stably; 2. Try to reduce the speed as much as possible. A low spinning speed can slow down the reciprocating traverse of the filament bundle on the traversing guide. When the filament bundle reaches one end of the bobbin, the inertia of changing direction becomes weaker, and the filament bundle will not be slipped out of the bobbin surface by inertia to cause filament entanglement; 3. Adopt a smaller winding angle. A smaller winding angle can reduce the reciprocating speed of the traversing guide and reduce the filament bundle thrown out by inertia.

[0010] In terms of equipment: Produce with the winding angle of the "rabbit head" traversing guide. However, the "rabbit head" traversing guide wears out quickly, and the reciprocating speed also needs to be low, otherwise filament entanglement will also occur. Therefore, the vehicle speed is generally not too high, resulting in poor economic benefits.

[0011] To sum up, FDY with a thick single filament fineness has always had a serious problem of bobbin forming. Moreover, the thicker the single filament, the more filament entanglement on the side of the bobbin after forming. Especially for varieties with a single filament fineness above 16D, whenever a serious problem of filament entanglement is encountered in new product development, it is impossible to move forward, and the differentiation of products and market applications are restricted.

[0012] The current process for producing super thick single-filament with few holes has the following defects: 1. The ring blowing uniform cooling blowing distance of the existing civil filament equipment is short, and the cooling length is insufficient; 2. The existing civil filament main networker cannot form network points; 3. Too large a winding tension makes the bobbin form too hard, and it is difficult to unwind later. Secondly, too large a tension easily causes the bobbin to form a bulging belly, the paper tube is locked by the filament bundle, and it cannot be withdrawn from the machine, resulting in non-continuous production; 4. The filament bundles entering both ends of the winding machine are at an inclined pulling angle. When the traversing guide moves the filament at an inclined pulling angle left and right, it causes the phenomenon that the tensions at both ends of the bobbin are different. Finally, the bobbins formed at the two spindle positions at both ends of the winding machine are asymmetric, and it is easier to have filament entanglement; 5. Reducing the vehicle speed will increase the cost, which is not conducive to the expansion of economic benefits; 6. Adopting a small winding angle is a limited space. Too small a winding angle will cause the bobbin to collapse at the edge and the forming to be abnormal; 7. The "rabbit head" traversing guide on the equipment wears out quickly, and the replacement cost is high. Moreover, the "rabbit head" traversing guide can only adopt a process with a low reciprocating speed, otherwise filament entanglement will also occur. Therefore, the vehicle speed is generally not too high, resulting in poor economic benefits.

[0013] Therefore, this application needs to solve the following multiple technical problems: 1. The problem that the existing process cannot cool and produce monofilaments with more than 16D and few holes and thick filaments normally; 2. The problem that the filament bundle is loose and has no network points when the existing equipment produces thick monofilament polyester FDY; 3. The problem that the tension is too large when the existing process produces thick monofilament polyester FDY, resulting in abnormal formation of the cheese; 4. The problem that the formation of the cheese at both ends of the winding machine is asymmetric when the existing process produces thick monofilament polyester FDY; 5. The problem that the vehicle speed is low and the economic benefit is low when the existing process produces thick monofilament polyester FDY; 6. The problem that the cheese formation is seriously entangled with filaments when the existing process equipment produces thick monofilament polyester FDY.

[0014] In view of the deficiencies of the existing technology, an object of this specification is to provide a production method for super thick monofilaments with few holes, which can achieve uniform cooling, can process network points, and the FDY cheese is symmetric on both left and right sides during formation, without filament entanglement, and does not affect the spinning speed.

[0015] To achieve the above object, the embodiments of this specification provide a production method for super thick monofilaments with few holes, including the following steps: Step S10: Extrude and form the spinning melt through a spinneret; Step S20: Cool the extruded and formed filament bundle through a cooling mechanism; Step S30: Bundle and oil the cooled filament bundle; Step S40: Let the oiled filament bundle enter a pre-networker; the air pressure of the pre-networker is greater than 0.1 MPa; Step S50: Let the filament bundle output by the pre-networker pass through a first hot roll and a second hot roll in sequence for heating and drawing and setting; Step S60: Let the drawn and set filament bundle enter a main networker; the air pressure of the main networker is greater than 0.3 MPa; the main networker includes two symmetrically arranged nozzles with a predetermined included angle; Step S80: Wind the filament bundle output by the main networker using a winding machine; the surface pressure of the winding machine is set to be greater than 500 N.

[0016] As a preferred embodiment, in the step S40, the air pressure of the pre-networker is set to 0.2 MPa to 0.3 MPa.

[0017] As a preferred embodiment, in the step S60, the air pressure of the main networker is set to 0.4 MPa to 0.5 MPa.

[0018] As a preferred embodiment, in the step S80, the surface pressure of the winding machine is set to 900 N.

[0019] As a preferred embodiment, in the step S20, the cooling mechanism is provided to include a bellows, an extended air duct connected to the bottom of the bellows, and a plurality of the extended air ducts extending in the vertical direction; the extended air duct includes a straight tube section and an air outlet section arranged up and down, and a plurality of through holes are provided on the side wall of the air outlet section.

[0020] As a preferred embodiment, the length of the extended air duct is 90 cm to 110 cm; the cold zone distance of the cooling mechanism is 130 cm to 150 cm.

[0021] As a preferred embodiment, in the step S60, the main netting device is provided to include a first wire inlet, an air inlet, two nozzles connected to the air inlet, and a wire bundle channel located between the first wire inlet and the nozzles; the air inlet and the first wire inlet are arranged opposite to each other in a first direction; the nozzles are arranged towards the first wire inlet in the first direction, and the orientation of the nozzles and the first direction have a predetermined angle; the two nozzles are oriented in opposite directions in a second direction; the first direction, the second direction, and the vertical direction are perpendicular to each other in pairs; the cross-sectional shape of the wire bundle channel is composed of two symmetric figures, and the length of the wire bundle channel in the second direction is greater than the length in the first direction; the two nozzles respectively correspond to the two figures.

[0022] As a preferred embodiment, the symmetry axes of the two nozzles extend along the first direction; the air inlet is connected with a compressed air socket; the cross-section of the wire bundle channel is formed by two circular parts of the same size overlapping, the two circles are aligned in the second direction, and the distance between the centers of the two circles is greater than the radius of the circle and less than the diameter of the circle.

[0023] As a preferred embodiment, after the step S60 and before the step S80, there is also a step S70: passing the wire bundle output by the main netting device through a wire guiding mechanism; wherein, the wire guiding mechanism is installed at the opening of a steel platform, the first hot roller, the second hot roller, and the main netting device are arranged above the steel platform, a winding machine is arranged below the steel platform, and a winding wire guiding hook is arranged above the winding machine; the wire guiding mechanism includes: a mounting plate fixedly installed at the opening, and a movable wire guiding hook slidably installed on the mounting plate; a sliding groove is provided on the mounting plate; the movable wire guiding hook is fixedly connected with a slider, and the slider is arranged in the sliding groove; in the second direction, the size of the slider is smaller than the size of the sliding groove; the movable wire guiding hook and the winding machine wire guiding hook are in one-to-one correspondence in the vertical direction.

[0024] As a preferred embodiment, between the step S30 and the step S40, the method further includes: passing the oiled tow through a first comb-shaped wire guide; between the step S40 and the step S50, the method further includes: passing the tow output from the pre-networker through a second comb-shaped wire guide and a deflecting wire guide in sequence. Beneficial effects

[0025] In the production method of the few-hole and extra-coarse denier single fiber filaments provided by this embodiment, the air pressure of the pre-networker is set to be greater than 0.1 MPa in the step S40, which is different from the conventional pre-network air pressure set to 0.05 MPa - 0.1 MPa. The relatively high pre-network air pressure can fully mix and wind the loose tow after the nozzle bunching initially. Because for the few-hole and coarse denier filaments, if the bunching is insufficient, macroscopically, a cylinder cannot be formed. When being heated and drawn on the hot roller, it is prone to uneven heating and uneven stretching, resulting in the tow being prone to forming looped filaments after stretching and setting. When the looped filaments pass through the wire guiding parts, they are frictionally stretched, ultimately leading to the breakage of single filaments and affecting the subsequent use. Therefore, the production method of the present invention sets an extremely high pre-network pressure to improve the cohesion of the few-hole and coarse denier single filaments, so as to facilitate uniform stress during heating and stretching on the hot roller.

[0026] In the step S60, the air pressure of the main networker is set to be greater than 0.3 MPa, which is different from the conventional main network air pressure set to 0.3 MPa. The extremely high main network air pressure can achieve a very good reverse airflow effect in the main networker with double nozzles. The main networker provided by the present invention includes two nozzles, and the two nozzles are symmetrically inclined with a predetermined included angle, so as to separate a tow with very few single filaments, make it move in an opposite saddle shape along two trajectories, and meet and violently wind around each other at the middle position of the network air duct, tightly winding the few-hole and coarse denier single filaments together to form network nodes. Compared with the vertical air blowing mode of a single nozzle in the conventional networker, the two nozzles with an oblique angle in the present invention are more effective in forming network points on the few-hole and coarse denier single filaments. When the ordinary main networker is used for the product to be solved in the present invention, not a single network can be formed, while the novel networker provided by the present invention can achieve the effect of forming 5 - 10 networks per meter, which belongs to a huge progress and breakthrough.

[0027] In step S80, the surface pressure of the winding machine is set to be greater than 500 N. The surface pressure is an important parameter in bobbin forming. The surface pressure is the vertical contact pressure between the pressure roller of the winding machine and the surface of the bobbin package. Setting a certain contact pressure can ensure that the surface of the bobbin is flat, firm and not soft. In the prior art, the general setting range of the surface pressure is 200 N - 300 N. The production method of the present invention provides a process parameter that breaks through the tradition and sets the surface pressure to be greater than 500 N. The key problem to be solved by the present invention is the bobbin forming problem of few-hole and thick-denier monofilament FDY. The conventional surface pressure is not enough to change the problem of wire entanglement at the end face of the bobbin forming. And setting the surface pressure to be greater than 500 N is also a high-pressure parameter that has not been touched by civil silk at present. It can reduce the probability of wire entanglement. The principle behind it is that when the high-pressure contacts the winding surface of the bobbin, the loose filament bundles with small surface area will be squeezed together like compressed biscuits. When the end face of the bobbin after high-pressure extrusion rotates at a high speed in the winding machine, no wire will be thrown out from the end face to form wire entanglement.

[0028] Referring to the following description and the drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0029] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0030] It should be emphasized that the term "comprising / including" when used herein refers to the presence of features, whole things, steps or components, but does not exclude the presence or addition of one or more other features, whole things, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic photo showing the phenomenon of wire entanglement in the prior art; Figure 2 It is a schematic structural diagram of a filament bundle entering a winding machine through a winding wire guide in the prior art; Figure 3 It is a side view of a filament bundle entering a winding machine in the prior art; Figure 4It is a flowchart of the steps of a production method for a super thick single filament with few holes provided in this embodiment; Figure 5 It is a schematic structural diagram of a production device used in a production method for a super thick single filament with few holes provided in this embodiment; Figure 6 It is Figure 5 partial side view of; Figure 7 It is a schematic structural diagram of a cooling mechanism provided in this embodiment; Figure 8 It is a schematic structural diagram of an extension air duct provided in this embodiment.

[0033] Figure 9 It is a schematic structural diagram of a pre-networker provided in this embodiment; Figure 10 It is Figure 9 partial enlarged structural diagram of; Figure 11 It is Figure 10 cross-sectional structural diagram of; Figure 12 It is a schematic structural diagram of a main networker provided in this embodiment; Figure 13 It is Figure 12 partial enlarged structural diagram of; Figure 14 It is Figure 13 cross-sectional structural diagram of; Figure 15 It is a working principle diagram of a main networker provided in this embodiment; Figure 16 It is a schematic diagram of the structure when the tow enters the winder through the winding guide after using the wire guiding mechanism provided in this embodiment; Figure 17 It is a schematic structural diagram of a wire guiding mechanism provided in this embodiment; Figure 18 It is Figure 17 top view of; Figure 19 It is Figure 16 structural diagram of the traversing wire guide in; Figure 20 It is Figure 18 structural diagram of the movable wire guide hook and slider in; Figure 21 It is a top view of a movable wire guide hook provided in this embodiment; Figure 22 It is a comparison diagram of the products produced by using the production method of the super thick single filament with few holes in this application and the products produced by the conventional production method.

[0034] Description of the reference numerals: 1. Steel platform; 11. Opening; 2. Cooling mechanism; 21. Air box; 22. Extended air duct; 221. Straight tube section; 222. Air outlet section; 2221. Through hole; 223. Connecting part; 2231. Screw hole; 3. Pre-networker; 31. First fixing plate; 32. Second wire inlet; 4. First hot roller; 5. Second hot roller; 6. Main networker; 61. First wire inlet; 62. Air inlet; 63. Nozzle; 64. Tow channel; 65. Air inlet channel; 66. Compressed air socket; 67. Second fixing plate; 7. Winder; 71. Winding guide hook; 8. Wire guiding mechanism; 81. Mounting plate; 811. Sliding groove; 82. Movable wire guiding hook; 821. Mounting part; 822. Wire guiding part; 83. Slide block; 84. Fastener; 9. Traversing wire guide; 91. Rotating blade assembly; 911. Blade; 92. Arc plate; 10. Wound yarn cake; 12. Pressure roller; 13. Oil nozzle; 14. First comb-shaped wire guide; 15. Second comb-shaped wire guide; 16. Deflecting wire guide; 20. Tow; X. First direction; Y. Second direction; Z. Vertical direction. Detailed implementation manners

[0035] In order to enable those skilled in the art of this technology to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be another intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be another intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used herein in the description of the present invention are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] Please refer to Figure 4。The embodiments of the present application provide a production method for super thick single filaments with a small number of holes, including the following steps: Step S10: Extrude and form the spinning melt through a spinneret. Step S20: Cool the extruded and formed filament bundle 20 through a cooling mechanism 2. Step S30: Bundle and oil the cooled filament bundle 20. Step S40: Feed the oiled filament bundle 20 into a pre-networker 3; the air pressure of the pre-networker 3 is greater than 0.1 MPa. Step S50: Feed the filament bundle 20 output from the pre-networker 3 successively through a first hot roller 4 and a second hot roller 5 for heating and stretching and setting. Step S60: Feed the stretched and set filament bundle 20 into a main networker 6; the air pressure of the main networker 6 is greater than 0.3 MPa; the main networker 6 includes two symmetrically arranged nozzles with a predetermined included angle. Step S80: Wind the filament bundle 20 output from the main networker 6 using a winder 7; the surface pressure of the winder 7 is set to be greater than 500 N.

[0039] In the production method for super thick single filaments with a small number of holes provided by this embodiment, in step S40, the air pressure of the pre-networker 3 is set to be greater than 0.1 MPa, which is different from the conventional pre-network air pressure set at 0.05 MPa - 0.1 MPa. The relatively large pre-network air pressure can fully preliminarily mix and wind the loose filament bundle 20 after being bundled by the oil nozzle 13. Because if the bundling of the super thick single filaments with a small number of holes is insufficient, macroscopically, a cylinder cannot be formed. When being heated and drawn on the hot roller, it is prone to uneven heating and uneven stretching, resulting in the filament bundle 20 being prone to forming looped filaments after stretching and setting. When the looped filaments pass through the wire guiding member, they are frictionally stretched, ultimately leading to the breakage of single filaments and affecting the subsequent use. Therefore, the production method of the present invention sets an extremely high pre-network pressure to improve the cohesion of the super thick single filaments with a small number of holes, so as to facilitate uniform heating and stretching force on the hot roller.

[0040] In step S60, the air pressure of the main networker 6 is set to be greater than 0.3 MPa, which is different from the conventional main network air pressure set to 0.3 MPa. The ultra-high main network air pressure can achieve a good return air flow effect in the main networker 6 with double nozzles. The main networker 6 provided by the present invention includes two nozzles, and the two nozzles are symmetrically inclined and arranged at a predetermined angle, so that a filament bundle 20 with very few single filaments can be separated, move in an opposing saddle shape around two trajectories, and meet and entangle violently at the middle position of the network air duct, tightly winding the thick denier single filaments with few holes together to form network nodes. Compared with the vertical air blowing method of a single nozzle in the conventional networker, the two nozzles with an oblique angle in the present invention are more effective in making network points on the thick denier single filaments with few holes. When the ordinary main networker 6 is used on the product to be solved in the present invention, not even a single network can be made, while the new networker provided by the present invention can achieve the effect of forming 5 - 10 networks per meter, which belongs to a huge progress and breakthrough.

[0041] In step S80, the surface pressure of the winding machine 7 is set to be greater than 500 N. The surface pressure is an important parameter in winding forming. The surface pressure is the vertical contact pressure between the pressure roller 12 of the winding machine 7 and the winding surface of the bobbin. Setting a certain contact pressure can ensure that the winding surface of the bobbin is flat, firm and not soft. In the prior art, the general setting range of the surface pressure is 200 N - 300 N. The production method of the present invention provides a process parameter that breaks through the tradition, setting the surface pressure to be greater than 500 N. The key problem to be solved in the present invention is the winding forming problem of the thick denier single filament FDY with few holes. The conventional surface pressure is not enough to change the problem of filament entanglement at the end face of the bobbin forming. And setting the surface pressure to be greater than 500 N is also a high-pressure parameter that has not been touched by civil filaments at present. It can reduce the probability of filament entanglement. The principle behind it is that when the high-pressure contacts the winding surface of the bobbin, the loose filament bundle 20 with a small surface area will be squeezed together like compressed biscuits. When the end face of the bobbin after high-pressure extrusion rotates at a high speed in the winding machine 7, no single filament will be thrown out from the end face to form filament entanglement.

[0042] Specifically, in step S40, the air pressure of the pre-networker 3 is preferably set to 0.2 MPa - 0.3 MPa. In step S60, the air pressure of the main networker 6 is preferably set to 0.4 MPa - 0.5 MPa. In step S80, the surface pressure of the winding machine 7 is set to 900 N. These process parameters are different from the conventional process settings and seriously break through the conventional process setting range, belonging to an ultra-conventional setting range.

[0043] When the face pressure setting reaches 900 N, there is an obvious change in the formation of thick monofilaments with fewer holes. The end face is neat and there is no snagging wire. The products produced by the production method provided by the present invention have been used by customers many times and have received good feedback, indicating that the present invention has good practical feasibility and practicability. At present, the above-mentioned unconventional process parameter settings have not been seen in any papers or patents. These process parameters are set by the inventor by breaking through conventional thinking in practice.

[0044] In this embodiment, as Figure 7 and Figure 8 shown, in step S20, the cooling mechanism 2 is provided to include a wind box 21 and an extended air duct 22 connected to the bottom of the wind box 21. There are multiple extended air ducts 22, and each extended air duct 22 corresponds to a filament bundle 20. The extended air duct 22 is detachably connected to the bottom of the wind box 21. The multiple extended air ducts 22 extend along the vertical direction Z. The extended air duct 22 includes a straight tube section 221 and an air outlet section 222 arranged up and down, and the straight tube section 221 is located above the air outlet section 222. The side wall of the air outlet section 222 is provided with multiple through holes 2221. The multiple through holes 2221 are uniformly distributed in the axial and circumferential directions.

[0045] By providing the extended air duct 22 below the wind box 21, the cooling distance can be extended. At the same time, the extended air duct 22 includes a straight tube section 221 and an air outlet section 222 arranged up and down. The straight tube section 221 is a tight air duct without holes, so that the cooling air can continue to extend the cooling of the filament bundle 20 after coming down from the wind box 21. The side wall of the air outlet section 222 is provided with multiple through holes 2221 for air outlet, that is, the straight tube section 221 is an air duct with through holes, which not only extends the cooling but also increases the heat dissipation effect, preventing the high-temperature air after the heat exchange between the cooling air and the molten filament extruded from the spinneret from not being diffused from around the filament bundle 20 in time.

[0046] The extended air duct 22 provided in this embodiment, with its unique structure, can not only play the role of extending the cooling distance, but also play the role of preventing the environmental wind from interfering with the filament bundle 20 in the air duct, like putting a turtleneck sweater on the filament bundle 20, playing the role of stabilizing the tension of the filament bundle 20 during cooling (because there are few super-thick monofilaments, the spinning tension is small, and it is easily interfered by the environmental wind and shakes, resulting in uneven extrusion molding), and achieving the purpose of uniform cooling.

[0047] In this embodiment, the diameter of the through hole 2221 is 0.3 cm to 0.5 cm, so as to better dissipate heat. Preferably, the distance between adjacent through holes 2221 is 0.5 cm to 1.0 cm, which not only extends the cooling but also increases the heat dissipation effect, and can timely discharge the high-temperature air around the filament bundle 20 to achieve the purpose of uniform cooling.

[0048] As Figure 8As shown, a connecting portion 223 is provided at the top of the straight barrel section 221. The outer diameter of the connecting portion 223 is larger than the diameter of the straight barrel section 221, which facilitates connecting the extension air duct 22 to the bottom of the air box 21. A plurality of screw holes 2231 are provided on the connecting portion 223. The number of the screw holes 2231 is preferably three, which can not only achieve the effect of stable connection, but also facilitate quick installation and disassembly. Specifically, the plurality of screw holes 2231 are evenly distributed in the circumferential direction. The connecting portion 223 is fixedly connected to the bottom of the air box 21 by screws, and the screws pass through the screw holes 2231. The detachable connection between the extension air duct 22 and the bottom of the air box 21 is realized by screws, which is convenient for installation and modification.

[0049] In this embodiment, the diameters of the straight barrel section 221 and the air outlet section 222 are equal. The lengths of the straight barrel section 221 and the air outlet section 222 in the vertical direction Z are equal. The difference between the straight barrel section 221 and the air outlet section 222 lies only in whether through holes 2221 are provided on the side wall. In other embodiments, the lengths of the straight barrel section 221 and the air outlet section 222 in the vertical direction Z can be reasonably set respectively according to the cooling and heat dissipation requirements.

[0050] Specifically, the length of the extension air duct 22 is 90 cm to 110 cm. Since the cooling length of the traditional air box 21 is about 40 cm to 50 cm, in order to achieve a cold zone distance of 130 cm to 150 cm (the preferred cold zone distance is about 140 cm), the cooling mechanism 2 provided in this application sets the length of the extension air duct 22 to be 90 cm to 110 cm. Further, the length of the extension air duct 22 is 100 cm.

[0051] In this embodiment, the air box 21 can be selected from the air box 21 in the traditional ring blowing cooling equipment, that is, the air box 21 in the prior art, and this application will not describe the air box 21 redundantly. By installing the extension air duct 22 at the bottom of the air box 21, the cooling mechanism 2 required by this application can be obtained. A ring blowing filter element is provided in the air box 21. After the spinneret extrudes the melt, it reaches the air box 21. There is a ring blowing filter element in the air box 21. The tow 20 passes through the center of the ring blowing filter element and reaches the inside of the extension air duct 22. After passing through the extension air duct 22, the tow 20 reaches the oil nozzle 13 for bundling and oiling, and then the subsequent spinning process is carried out. The cooling mechanism 2 provided in this embodiment can solve the problems of short cooling blowing distance and insufficient cooling length in the existing civil silk equipment, and can solve the problem that the existing process cannot normally cool and produce thick filaments with more than 16 D per single filament, and can fully cool the FDY of the super coarse single filament with a small number of holes.

[0052] In this embodiment, as Figures 12 to 14As shown, in step S60, the main networker 6 is provided with a first wire inlet 61, an air inlet 62, two nozzles 63 connected to the air inlet 62, and a tow channel 64 located between the first wire inlet 61 and the nozzles 63. The air inlet 62 and the first wire inlet 61 are oppositely arranged in the first direction X. The nozzles 63 are arranged towards the first wire inlet 61 in the first direction X, and the orientation of the nozzles 63 forms a predetermined angle with the first direction X. The two nozzles 63 face in opposite directions in the second direction Y. Thus, the orientations of the two nozzles 63 both have components in the first direction X and the second direction Y, and the components in the first direction X face the same direction, while the components in the second direction Y face opposite directions. The cross-sectional shape of the tow channel 64 is composed of two symmetric figures compounded together. The two symmetric figures are aligned in the second direction Y, and the length of the tow channel 64 in the second direction Y is greater than its length in the first direction X. The two nozzles 63 respectively correspond to the two figures, and the gas ejected from the nozzles 63 gathers the tow 20 in the tow channel 64 towards the center of the tow channel 64.

[0053] Wherein, the second direction Y, the first direction X, and the vertical direction Z are perpendicular to each other pairwise, and the second direction Y and the first direction X are two mutually perpendicular directions in the horizontal plane.

[0054] The main networker 6 can increase the network points of the fine-hole tow. By arranging two juxtaposed nozzles 63, with the orientation of the nozzles 63 forming a predetermined angle with the first direction X and the two nozzles 63 facing in opposite directions in the second direction Y, that is, the two nozzles 63 have a certain inclination, the traditional vertical air-blowing method can be changed; in this application, the cross-sectional shape of the tow channel 64 of the networker is also different from that of a general networker. The cross-section of the tow channel 64 of a general networker is circular or triangular, while the cross-section of the tow channel 64 of the networker provided in this application is composed of two symmetric figures compounded together, and the length of the tow channel 64 in the second direction Y is greater than its length in the first direction X. The loose fine-hole tow 20 with a small number of holes moves in opposite directions of the two figures on the left and right sides under the double-jet pressure evacuation, meets in the middle of the cross-section, collides and winds around each other, greatly increasing the probability of single-filament winding and intersection, increasing the probability of entanglement knots, ultimately increasing the network points. The fine-hole tow with increased network points has good bale-holding property, and the tow 20 with entanglement knots increases the contact nodes between the filaments, increasing the friction force between the filaments. After the two are enhanced, the occurrence of snagged filaments and looped filaments in subsequent winding can be reduced.

[0055] In this embodiment, the two nozzles 63 are symmetrically arranged, and the symmetry axes of the two nozzles 63 extend along the first direction X, so as to blow air evenly on both sides of the tow 20.

[0056] Such as Figure 14As shown in the figure, an air inlet passage 65 is provided between the air inlet 62 and the nozzle 63. One end of each of the two air inlet passages 65 is connected to the air inlet 62, and the other ends are respectively connected to the two nozzles 63. Specifically, the two air inlet passages 65 are symmetrically arranged, and the symmetry axes of the two air inlet passages 65 extend along the first direction X. Preferably, the included angle between the two air inlet passages 65 is an acute angle, which can minimize the distance between the nozzle 63 and the air inlet 62 and reduce the loss of compressed air in the path.

[0057] In this embodiment, the air inlet 62 is connected with a compressed air socket 66 for introducing compressed air. Although two nozzles 63 are provided in this application, only one compressed air socket 66 is needed, which saves space in structure and saves accessories in terms of consumables.

[0058] As Figure 15 shown, the cross-section of the tow passage 64 can be formed by the overlap of two circular parts of the same size. The two circles are aligned in the second direction Y, and the distance between the centers of the two circles is greater than the radius of the circle and less than the diameter of the circle. Figure 15 The arrow in

[0059] shows the flow direction of the compressed air. Specifically, the nozzle 63 is located at the end of the circle farthest from the filament inlet in the first direction X. Under the double-jet compressed air, the loose low-porosity tow 20 moves in opposite directions of the two circles on the left and right sides respectively for the single filaments, meets in the middle of the two circles, collides and winds, greatly increasing the probability of single-filament winding intersection, increasing the probability of entanglement knots, and ultimately increasing the network points.

[0060] Preferably, the filament inlet is located at the middle position of the networker in the second direction Y. The air inlet 62 is located at the middle position of the networker in the second direction Y.

[0061] Generally speaking, the novel main networker 6 of this application is significantly different from the networker in the conventional civil filament production process, and can solve the problem that the tow 20 is loose and has no network points when producing single-filament thick polyester FDY with existing equipment.

[0062] The inventor's research found that in the prior art, the tows entering both ends of the winding machine are at an inclined pulling angle. When the traversing guide wire device moves the wire left and right under the inclined pulling angle, it causes the phenomenon that the tensions at both ends of the wire cake are different. Eventually, the wire cakes formed at the two spindle positions of the winding machine are asymmetric and are more likely to produce snagged wires.

[0063] For the few-hole filaments of super thick monofilaments, during the winding forming process, due to the small number of holes and the thick fineness, when the filament bundle is stacked on the paper tube, the contact area between filaments is small and the friction points are few. During high-speed winding, as the height of the filament layer stacking increases, the outer layer will slowly generate relative slip relative to the inner layer. If the stacking tensions on the left and right sides of the filament cake are different, it will cause asymmetry in the forming of the inner and outer sides of the filaments, which will affect the winding tension fluctuation of the filament cake during later processing and may even cause filament breakage in severe cases.

[0064] In the conventional civil spinning process, the angles at which the silk paths above the winding machine 7 enter the winding machine 7 are different. Generally, the filament bundle 20 comes down from the middle of the winding machine 7. Therefore, for the middle spindle positions of the winding machine 7, the filament bundle 20 enters the winding guide wire hook 71 vertically, while for the spindle positions on both sides of the winding machine 7, the filament bundle 20 enters at an inclined angle, as Figure 3 shown. After the filament bundle 20 enters the winding guide wire hook 71 obliquely, it then enters the traversing guide 9. When the traversing guide 9 reciprocates the filament bundle 20 back and forth on its fork blade 911, when the filament bundle 20 runs to the inclined side on the filament cake, as Figure 2 shown on the left side, the entire silk path presents an acute angle α1 on the winding guide wire hook 71, and at this time the tension of the filament bundle 20 is large; as Figure 2 shown on the right side, when the filament bundle 20 on the winding guide wire hook 71 presents an obtuse angle α2, the tension of the filament bundle 20 is small; thus causing the tensions on the left and right sides of the wound filament cake 10 of the filament bundle 20 to be different, and finally resulting in asymmetry in the forming of the filament cake. Usually, this asymmetry will not affect the use of the filament cake of conventional specifications, but the impact on the thick monofilament specifications with a small number of holes to be solved in this application cannot be ignored.

[0065] Therefore, after step S60 and before step S80, there is also step S70: passing the filament bundle output by the main networker through the wire guiding mechanism. As Figure 5 shown, the wire guiding mechanism 8 is installed at the opening 11 of the steel platform 1. Above the steel platform 1, there are a first hot roller 4, a second hot roller 5 and a main networker 6, and below the steel platform 1, there is a winding machine 7. Above the winding machine 7, there is a winding guide wire hook 71. As Figure 5 、 Figure 17 and Figure 18 shown, the wire guiding mechanism 8 includes: a mounting plate 81 fixedly installed at the opening 11, and a movable wire guiding hook 82 slidably installed on the mounting plate 81. The mounting plate 81 is provided with a sliding groove 811. As Figure 20As shown, a movable wire guide hook 82 is fixedly connected with a slider 83, and the slider 83 is arranged in a sliding groove 811. In the second direction Y, the size of the slider 83 is smaller than that of the sliding groove 811, enabling the movable wire guide hook 82 to slide in the second direction Y. The movable wire guide hook 82 and the wire guide hook of the winding machine 7 are in one-to-one correspondence in the vertical direction Z. The tow 20 passing through the second hot roller 5 and the main networker 6 successively enters the winding machine 7 through the movable wire guide hook 82 and the winding wire guide hook 71. The tow 20 passing through the movable wire guide hook 82 vertically enters the winding wire guide hook 71.

[0066] By fixedly installing a mounting plate 81 at the opening 11 of the steel platform 1, and slidably installing the movable wire guide hook 82 on the mounting plate 81, the movable wire guide hook 82 is fixedly connected with a slider 83, and the slider 83 can slide in the sliding groove 811 along the second direction Y, thereby driving the movable wire guide hook 82 to slide in the second direction Y. The position of the movable wire guide hook 82 in the second direction Y is variable, so that the silk path entering the winding machine 7 turns and then enters the winding machine 7 at a set angle, ensuring the angle of the silk path on the winding wire guide hook 71, and the angles of the tow 20 are consistent when the tow 20 traverses horizontally left and right. The movable wire guide hook 82 can change the angle of the tow 20 to all vertically enter the winding wire guide hook 71, ensuring that the ingot positions of the tow 20 entering the winding machine 7 are all at the same vertical angle, so that the FDY cake can be formed symmetrically on both left and right sides, without snagging wires, and maintaining the conventional FDY spinning speed.

[0067] In this embodiment, a plurality of sliding grooves 811 are arranged at intervals in the second direction Y, and a plurality of movable wire guide hooks 82 are respectively slidably arranged in the plurality of sliding grooves 811. The number of the appropriate sliding grooves 811 and movable wire guide hooks 82 can be selected according to the number of required ingot positions. Preferably, the distance between adjacent two sliding grooves 811 is equal everywhere. Of course, in other embodiments, the distance between adjacent two sliding grooves 811 at different positions can be appropriately adjusted according to needs.

[0068] As Figure 18 shown, the movable wire guide hook 82 and the slider 83 are fixedly connected through a fastener 84. The fastener 84 can be selected as a component such as a screw that is convenient for disassembly and installation. Specifically, part of the fastener 84 protrudes from the top surface of the mounting plate 81, facilitating the identification of the position of the movable wire guide hook 82.

[0069] In this embodiment, as Figure 21 shown, the movable wire guide hook 82 includes a mounting portion 821 and a wire guiding portion 822. The mounting portion 821 is linear, and the mounting portion 821 extends along the first direction X and passes through the sliding groove 811 to ensure the stable connection between the movable wire guide hook 82 and the mounting plate 81. The wire guiding portion 822 is a notched circular ring, and the notch and the central hole are for the tow 20 to pass through. Preferably, a plurality of wire guiding portions 822 are located on the same side of the mounting plate 81 in the first direction X.

[0070] In order to improve production efficiency, as Figure 5 shown, there are two mounting plates 81, which are respectively located at both ends of the opening 11 in the first direction X. The wire guiding parts 822 of the movable wire guiding hooks 82 on the two mounting plates 81 are arranged oppositely, and each mounting plate 81 corresponds to a winding machine 7. The winding directions of the two winding machines 7 are opposite. Preferably, the two mounting plates 81 and the movable wire guiding hooks 82 on the mounting plates 81 are symmetrically arranged in the first direction X.

[0071] As Figure 5 and Figure 6 shown, in the first direction X, the first hot roller 4 is located on one side of the second hot roller 5. In the vertical direction Z, the cooling mechanism 2 is located above the pre-networker 3, the pre-networker 3 is located above the first hot roller 4, and the main networker 6 is located between the second hot roller 5 and the opening 11. Such a layout can simplify the traveling path of the tow 20 and reduce the probability of wire entanglement during winding.

[0072] In this embodiment, between step S30 and step S40, it further includes: passing the oiled tow 20 through the first comb-shaped wire guide 14. Between step S40 and step S50, it further includes: passing the tow output by the pre-networker through the second comb-shaped wire guide 15 and the deflecting wire guide 16 in sequence.

[0073] In this embodiment, the steel platform 1, the first hot roller 4, the second hot roller 5, the pre-networker 3, the winding machine 7, and the winding wire guiding hook 71 can all adopt conventional structures, which will not be elaborated in this application. A pressure roller 12 can also be provided above the winding machine 7. As Figures 9 to 11 shown, the pre-networker 3 is fixedly installed through the first fixing plate 31. The pre-networker 3 is provided with a second wire inlet 32, and a compressed air socket 66 is provided on the side. The compressed air output by the compressed air socket 66 is ejected radially. As Figure 12 shown, the main networker 6 is fixedly installed through the second fixing plate 67.

[0074] In a specific application scenario, after the spinneret extrudes the melt, it reaches the air box 21. There is an annular blow filter element in the air box 21. The tow 20 passes through the center of the filter element and reaches the extended air duct 22 at the bottom of the air box 21. After passing through the extended air duct 22, the tow 20 reaches the oil nozzle 13 for bundling and oiling, and then reaches the first comb-shaped wire guide 14. After being combed and split, it enters the pre-networker 3. The oiled tow 20 is blown by compressed air at a certain pressure (0.2 MPa - 0.3 MPa) to form a more stable wound tow 20, which not only increases the cohesion of the tow 20 but also improves the uniform adhesion of the oil agent on the surface of the tow 20, achieving the purpose of stabilizing the tension for the subsequent hot roll stretching. The tow 20 coming out of the pre-networker 3 passes through the second comb-shaped wire guide 15 and then reaches the deflecting wire guide 16 in front of the first hot roll 4, rotating the angle of the tow 20 by 90 degrees and smoothly fitting it onto the first hot roll 4 for heating by winding 5 - 6 turns. The heated tow 20 enters the second hot roll 5 for winding 5 - 6 turns for stretching and shaping. The shaped tow 20 passes through the main networker 6, is knotted and marked in the main networker 6, and then enters the movable wire guide hook 82 arranged on the steel platform 1, and then enters the winding wire guide hook 71 above the winding machine 7; after entering the winding wire guide hook 71, the tow 20 is traversed and deflected by the rotary vane type traversing wire guide 9 to lay the wire flat on the paper tube. As Figure 16 and Figure 19 shown, the traversing wire guide 9 is formed by superimposing two rotary vane assemblies 91. The two rotary vane assemblies 91 operate in opposite directions. When the upper rotary vane assembly 91 deflects the tow 20 from one side around the forming arc plate 92 to the other side, the lower rotary vane assembly 91 deflects the tow 20 back from the opposite direction.

[0075] As Figure 22 shown, the two left figures are the reverse view and the front view of the package of super coarse denier single filament with few holes produced by the conventional production method respectively. It can be seen that the surface is uneven and the coiling and snagging of the filaments are serious; the two right figures are the reverse view and the front view of the package of super coarse denier single filament with few holes produced by the production method of the super coarse denier single filament with few holes provided in this application respectively. It can be seen that the surface is basically flat and the phenomenon of coiling and snagging of the filaments is significantly improved.

[0076] All in all, the production method of the super coarse denier single filament with few holes provided in this application has the following advantages: 1. It can fully cool the FDY of the super coarse denier single filament with few holes; 2. It can process network points on the FDY of the super coarse denier single filament with few holes; 3. It can make the left and right sides of the FDY cake of the super coarse denier single filament with few holes symmetrical in shape; 4. It can make the FDY cake of the super coarse denier single filament with few holes free of snagging filaments; 5. It can solve the problem of snagging filaments in the package of the super coarse denier single filament with few holes without reducing the winding speed.

[0077] It should be noted that in the description of this specification, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no sequence between the two, nor can it be construed as indicating or implying relative importance. In addition, in the description of this specification, unless otherwise stated, the meaning of "a plurality" is two or more.

[0078] Any numerical value cited herein includes all values from the lower value to the upper value increasing in increments of one unit between the lower and upper limits, provided that there is an interval of at least two units between any lower value and any higher value. For example, if it is stated that the value of the number of components or a process variable (such as temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, then the purpose is to illustrate that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in this specification. For values less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples intended to be clearly expressed, and it can be considered that all possible combinations of the numerical values listed between the lowest value and the highest value are explicitly set forth in this specification in a similar manner.

[0079] Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. The "about" or "approximate" used in conjunction with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0080] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of" describing a combination should include the identified elements, components, parts or steps and other elements, components, parts or steps that do not substantially affect the basic novel features of the combination. Using the terms "comprising" or "including" to describe the combinations of elements, components, parts or steps herein also contemplates embodiments consisting essentially of these elements, components, parts or steps. By using the term "may" herein, it is intended to indicate that any attribute described as "may" be included is optional.

[0081] A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step can be divided into separate multiple elements, components, parts or steps. The disclosure of "a" or "an" used to describe an element, component, part or step does not mean to exclude other elements, components, parts or steps.

[0082] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Accordingly, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the sake of completeness, all articles and references, including patent applications and published patents, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the inventor did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A method for producing a low-pore-count ultra-coarse denier monofilament, characterized in that: The following steps are involved: step S10: Extruding the spinning melt through a spinneret; Step S20: cooling the extruded filament bundle by a cooling mechanism; Step S30: Bunching and oiling the cooled filament bundles; Step S40: the oiled tow enters the pre-netting device; The air pressure of the pre-network device is greater than 0.1 MPa; Step S50: allowing the filaments outputted from the pre-network device to pass through a first hot roller and a second hot roller in sequence for heating and stretching; Step S60: allowing the stretched and shaped tow to enter a main network device; the air pressure of the main network device is greater than 0.3 MPa; the main network device includes two symmetrically arranged nozzles with a predetermined angle; Step S80: using a winding machine to wind the tow output by the main network device; the surface pressure of the winding machine is set to be greater than 500N.

2. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: In the step S40, the air pressure of the pre-network device is set to 0.2MPa~0.3MPa.

3. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: In the step S60, the air pressure of the main network device is set to 0.4MPa~0.5MPa.

4. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: In the step S80, the surface pressure of the winding machine is set to 900N.

5. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: In step S20, the cooling mechanism includes a bellows, an extended wind tube connected to the bottom of the bellows, and a plurality of extended wind tubes extend in a vertical direction; the extended wind tube includes a straight tube section and an air outlet section arranged up and down, and a side wall of the air outlet section is provided with a plurality of through holes.

6. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 5, characterized in that: The length of the extended wind tube is 90cm~110cm; the cold zone distance of the cooling mechanism is 130cm~150cm.

7. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: In the step S60, the main network device is set to include a first wire inlet, an air inlet, two nozzles connected to the air inlet, and a wire bundle channel located between the first wire inlet and the nozzle; the air inlet and the first wire inlet are arranged relative to each other in a first direction; the nozzle is arranged toward the first wire inlet in the first direction, and the direction of the nozzle has a predetermined angle with the first direction; the two nozzles are in opposite directions in the second direction; the first direction, the second direction and the vertical direction are perpendicular to each other; the shape of the cross-section of the wire bundle channel is composed of two symmetrical figures, and the length of the wire bundle channel in the second direction is greater than the length in the first direction; the two nozzles correspond to the two figures respectively.

8. The method for producing low-pore-count ultra-coarse denier monofilament according to claim 7, characterized in that: The symmetry axes of the two nozzles extend along the first direction; the air inlet is connected to a compressed air socket; the cross-section of the filament channel is composed of two overlapping circular parts of the same size, the two circles are aligned in the second direction, and the distance between the centers of the two circles is greater than the radius of the circle and less than the diameter of the circle.

9. The method for producing a low-pore-count ultra-coarse denier monofilament according to claim 7, characterized in that: After step S60 and before step S80, step S70 is also included: allowing the wire bundle output by the main network device to pass through a wire guide mechanism; wherein the wire guide mechanism is installed at the opening of the steel platform, the first hot roller, the second hot roller and the main network device are provided above the steel platform, the winding machine is provided below the steel platform, and a winding wire guide hook is provided above the winding machine; the wire guide mechanism includes: a mounting plate fixedly installed at the opening, and a movable wire guide hook slidably installed on the mounting plate; a sliding groove is provided on the mounting plate; the movable wire guide hook is fixedly connected to a slider, and the slider is arranged in the sliding groove; in the second direction, the size of the slider is smaller than the size of the sliding groove; the movable wire guide hook corresponds one-to-one with the winding machine wire guide hook in the vertical direction.

10. The method for producing low-pore-count ultra-coarse denier monofilament according to claim 1, characterized in that: Between step S30 and step S40, it also includes: allowing the oiled yarn bundle to pass through a first comb-shaped yarn guide; between step S40 and step S50, it also includes: allowing the yarn bundle output by the pre-network device to pass through a second comb-shaped yarn guide and a deflection yarn guide in sequence.

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