Method for producing triangular polyester drawn yarn through one-step stretching and shaping method

Abstract

The invention discloses a method for producing triangular polyester drawn yarns by a one-step stretching and shaping method, which comprises the following production steps of: S1, reacting two raw materials of PTA (pure terephthalic acid) and EG (ethylene glycol) through a polymerization device to form a polyester melt, and injecting the polyester melt into a spinning metering pump on a spinning manifold through a melt pipeline; s2, the polyester melt injected in the step S1 is discharged through a spinning assembly, cooling and shaping are conducted through a spinning chamber, oiling is conducted through an oil wheel device, 12 triangular spinneret orifices are formed in the spinning assembly, and the spinneret orifices are distributed in an inner circle and an outer circle in a staggered mode; s3, the oiled tows pass through a pre-network and then enter an SR1 separator roller, a GR1 hot roller, a GR2 hot roller and an SR2 separator roller to be subjected to combined heating, drafting and shaping; and S4, the tows subjected to heating, drafting and shaping in the step S3 pass through a main network, two bundles of 12F filaments are stranded into a bundle of 24F filaments, and finally the 24F filaments are wound through a TMT winding machine. The problems that an existing triangular yarn production process is complex and uneven after coloring can be solved, and the flash effect of the fiber is good.

Description

Technical Field

[0001] The present invention relates to the technical field of production processes of polyester fibers, and particularly to a method for producing triangular polyester drawn yarn by a one-step stretching and setting method. Background Art

[0002] Triangular yarn is a kind of bright-textured profiled polyester drawn yarn. Due to its unique triangular cross-sectional structure, it has a flash effect. It not only plays a decorative role in fabrics, but also can be blended or interwoven with other fibers to make flash wool yarns, scarves, spring and autumn wool sweaters, women's outerwear, evening gowns, etc. Triangular fibers also have a three-dimensional crimping characteristic and can be deformed into various shapes according to product requirements, with a uniform three-dimensional crimping characteristic. They can be blended with wool or viscose fibers, and are especially suitable for making wool-like flannel, which has a mild hand feeling and elegant color. The fabrics made of triangular fibers have good air permeability, excellent moisture absorption and sweat discharge properties, soft hand feeling, good wrinkle resistance, high abrasion resistance, antibacterial and odor-proof properties, etc., and are widely used in clothing fabrics and decorative fabrics. Compared with ordinary polyester fibers, triangular polyester fibers have a lower coefficient of expansion and can maintain good strength and stability in a humid or wet environment and are not easily deformed. For the manufacture of high-quality textiles, triangular polyester fibers are a very ideal and sustainable choice. Triangular polyester fibers can also be recycled and reused without causing pollution to the environment, and their performance and quality can still be well maintained during the recycling and reuse process. There is broad development prospect and good economic benefit.

[0003] In the production process of polyester drawn yarn, melt direct spinning is generally used for production. Among them, the equipment for melt direct spinning is generally divided into one-step stretching equipment and multi-step stretching equipment. When producing bright-textured profiled triangular polyester drawn yarn, the multi-step stretching method is generally used at present, which can ensure the stability of the product. However, the multi-step stretching method has 5 hot rollers, resulting in many production processes and a long process, and it is difficult to transform the equipment used in the one-step stretching method; although the equipment used in the one-step stretching method can shorten the process and reduce the number of processes, during production, since there are only 2 hot rollers and the stretching and setting are completed in the same process, when producing thick fibers, the probability of abnormal yarns appearing during the production process is high, and the quality stability of the product is relatively low. After coloring in the subsequent process, unevenness is likely to occur. Therefore, it is necessary to improve the equipment used in the one-step stretching method, so as to realize the production of bright-textured profiled triangular polyester drawn yarn by the one-step stretching method. Summary of the Invention

[0004] In order to solve certain or some technical problems existing in the prior art, the purpose of the present application is to provide a method for producing triangular polyester drawn yarn by a one-step stretching and setting method, which can solve the problems of complex production process and uneven coloring of existing triangular yarns, and the fiber has a good flash effect.

[0005] To solve the above-mentioned existing technical problems, the object of the present application is achieved by adopting the following technical solutions:

[0006] A method for producing triangular polyester drawn yarn by a one-step stretching and setting method, the production steps including:

[0007] S1. React two raw materials, PTA and EG, through a polymerization device to form a polyester melt, and inject the polyester melt into a spinning metering pump on a spinning box through a melt pipeline;

[0008] S2. After the polyester melt injected in step S1 is extruded through a spinning component, it is cooled and set in a spinning yarn chamber and oiled by an oil wheel device. The spinning component is provided with spinneret holes with 12 triangular holes, and the spinneret holes are distributed in two circular shapes, inside and outside, in a staggered manner;

[0009] S3. The oiled tow passes through a pre-network and then enters an SR1 splitting roller, a GR1 hot roller, a GR2 hot roller, and an SR2 splitting roller for combined heating, stretching, and setting;

[0010] S4. The tow after heating, stretching, and setting in step S3 passes through a main network to combine two 12F tows into a 24F tow, and finally is wound by a TMT winder.

[0011] Preferably, the triangular holes are equilateral triangles, and the 12 spinneret holes are distributed in two inner and outer circles. 4 spinneret holes are evenly distributed in the inner circle, and 8 spinneret holes are evenly distributed in the outer circle. The spinneret holes in the outer circle and the inner circle are arranged in a staggered manner, and the staggered spinneret holes form an overlapping structure of two horizontal and vertical rectangles after arrangement.

[0012] Preferably, a row of wire guides is provided between the side air-blowing mesh plate of the spinning yarn chamber and the middle of the spinning channel for the tow.

[0013] Preferably, the oil wheel device is arranged at the discharge port of the channel.

[0014] Preferably, a row of wire hooks is provided at both the inlet and outlet of the pre-network and the main network.

[0015] Preferably, a splitting rod is provided between the SR1 splitting roller and the pre-network.

[0016] Preferably, a splitting rod is provided between the GR1 hot roller and the GR2 hot roller.

[0017] Preferably, the temperature of the GR1 hot roller is 115 ± 0.5 °C, and the temperature of the GR2 hot roller is 160 ± 0.5 °C.

[0018] Preferably, the diameter of the GR1 hot roller is 23.5 cm, the diameter of the GR2 hot roller is 23.5 cm, the inclination angles of the GR1 hot roller 12 and the GR2 hot roller 16 are 3-5°, and the number of fiber windings on each hot roller is 8.5 or 9.5.

[0019] Preferably, the wind speed in the spinning chamber is 0.70±0.02 m / s; and the height of the windless zone on the spinning chamber is 10 CM.

[0020] Preferably, the process winding angle of the TMT winding machine is 5.2°-6.8°

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By improving the equipment and adjusting the process, the melt-spinning equipment can realize the production of triangular glossy special-shaped polyester drawn yarns through one-step stretching, and the phenomenon of abnormal yarns will no longer occur during the production of 12F and above thick yarns, so that the quality stability of the product is guaranteed and the problem of uneven coloring after the subsequent process is avoided. The triangular glossy special-shaped polyester drawn yarn has a good flash effect, which gives the fabric a unique flash effect. Finally, each tow is interwoven with two-hole triangular cross-section fibers. The triangular fibers can make the fabric have good air permeability and are more comfortable to wear.

[0023] The "triangular silk" produced by this method has stable quality. After weaving, the product has a unique craftsmanship. Its unique triangular cross-section characteristics make the fabric surface show sparkling spots after dyeing and finishing, which has a good sparkling effect. It not only plays an embellishment role in the fabric, but can also be blended or interwoven with other fibers to make shiny wool, scarves, spring and autumn wool sweaters, women's outerwear, evening gowns, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the improved structure of the device of the present invention;

[0025] Figure 2 It is a front schematic diagram of the spinneret assembly in the present invention;

[0026] Figure 3 It is a cross-sectional view of a monofilament product formed by 24F yarn in the present invention;

[0027] In the figure: 1. Spinning metering pump; 2. Spinning assembly; 3. Windless zone; 4. Spinning chamber; 5. Spinning box; 6. Wire guide; 7. Spinning tunnel; 8. Tanker device; 9. Wire guide hook; 10. Wire separation rod; 11. SR1 wire separation roller; 12. GR1 hot roller; 13. TMT winder; 14. Main network; 15. SR2 wire separation roller; 16. GR2 hot roller; 17. Pre-network; 18. Spinneret hole. Detailed implementation mode

[0028] Next, in combination with the accompanying drawings and specific implementation modes, the present application will be further described. It should be noted that, on the premise of non-conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments with each other.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.

[0030] Terms such as "first", "second", etc. in the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0031] As Figure 1 and Figure 3 shown, a method for producing triangular polyester drawn yarn by a one-step stretching and setting method, the production steps include:

[0032] S1. React two raw materials of PTA and EG through a polymerization device to form a polyester melt, and inject the polyester melt into the spinning metering pump 1 on the spinning box 5 through a melt pipeline;

[0033] S2. After the polyester melt injected in step S1 is extruded through the spinning pack 2, it is cooled and set in the spinning chamber 4 and oiled by the oiling device 8. The spinning pack 2 is provided with spinneret holes 18 with 12 triangular holes, and the spinneret holes 18 are distributed in an alternating pattern of two inner and outer circles;

[0034] S3. The oiled tow passes through the pre-network 17 and then enters the SR1 splitting roller 11, GR1 hot roller 12, GR2 hot roller 16 and SR2 splitting roller 15 for combined heating and drawing and setting;

[0035] S4. The tow after heating, drawing and setting in step S3 passes through the main network 14 to combine two tows of 12F into one tow of 24F silk (should it be written as 12F or 24F here), and finally is wound up by the TMT winder 13.

[0036] When producing triangular glossy shaped polyester drawn yarns through melt direct spinning equipment, production can be achieved through one-step stretching, requiring fewer steps and a shorter process, which can solve the problems of complex production process and uneven coloring of existing triangular yarns, and the fiber has a good flash effect. When producing through melt spinning, the spinneret holes 18 on the spinning assembly 2 use triangular spinneret holes 18, each side of the triangular spinneret holes 18 is 0.6 mm long, and each angle is 60°; the triangular yarn formed by the triangular spinneret holes 18 has a triangular cross-sectional structure and a flash effect, so that the fiber has a unique flash effect, and finally each tow is interwoven by two-hole triangular cross-sectional fibers, so that the fabric has good air permeability and is more comfortable to wear. The "triangular yarn" produced by this method has stable quality. After weaving, the product has a unique craftsmanship. Its unique triangular cross-section characteristics make the fabric surface after dyeing and finishing present a star-like glittering point, which has a good glittering effect. It not only plays an embellishment role in the fabric, but also can be blended or interwoven with other fibers to make glittering wool, scarves, spring and autumn wool sweaters, women's outerwear, evening dresses, etc. The triangular fiber also has a three-dimensional curling characteristic, which can be deformed into various shapes according to product requirements, and has a uniform three-dimensional curling characteristic. It can be blended with wool or viscose fiber, especially suitable for making wool-like flannel, which has a gentle feel and elegant color. The fabric made of triangular fiber has good air permeability, excellent moisture absorption and perspiration, soft feel, good wrinkle resistance, high wear resistance, antibacterial and deodorizing, etc., and is widely used in clothing and decorative fabrics. Compared with ordinary polyester fiber, triangular polyester fiber has a lower expansion coefficient, can maintain good strength and stability in a humid or wet environment, and is not easy to deform. For the manufacture of high-quality textiles, triangular polyester fiber is a very ideal and sustainable choice. Triangular polyester fiber can be recycled and reused without causing pollution to the environment. Its performance and quality can still be well maintained during the recycling and reuse process. It has broad development prospects and good economic benefits. It has become a new type of fashionable fabric in the chemical fiber market.

[0037] Further improvement is as follows: Figure 2 As shown, the triangular hole is an equilateral triangle, and the 12 spinneret holes 18 are distributed in two circles, an inner circle has 4 spinneret holes 18 evenly distributed, and an outer circle has 8 spinneret holes 18 evenly distributed. The spinneret holes 18 in the outer circle and the inner circle are staggered, and the staggered spinneret holes 18 are arranged to form two horizontal and vertical rectangular overlapping structures.

[0038] The conventional arrangement structure of the current spinneret holes 18 is generally an annular distribution with internal and external staggering and a relatively large number. Due to the shape characteristics of the triangular cross-sectioned tow, when it enters the spinning chamber 4 for cooling and shaping, it is very easy to have the problem of uneven cooling, resulting in the inability to ensure the uniformity after three-dimensional crimping, affecting the flash effect of the product. Even after reducing the number, the situation of uneven cooling is still likely to occur frequently. Therefore, the shape and arrangement of the spinneret holes 18 on the spinning pack 2 are precisely designed. Among them, the spinneret plate on the spinning pack 2 has 12 spinneret holes 18, with 4 evenly distributed in the inner circle and 8 evenly distributed in the outer circle. On this basis, the distribution structure is further optimized so that while the spinneret holes 18 in the outer circle and the inner circle are arranged in a staggered manner, the arranged spinneret holes 18 form an overlapping structure of two horizontal and vertical rectangles, thereby ensuring that after the fiber comes out of the triangular spinneret hole 18, it can obtain uniform cooling air, making the cooling effect of the tow better. The fiber with a triangular cross-section structure has uniform three-dimensional crimping characteristics, can be deformed into various shapes according to product requirements, and the flash points of the fiber are evenly arranged, with a better flash effect.

[0039] Furthermore, it is improved that a row of godets 6 is provided between the side air-blowing screen plate and the spinning channel 7 of the spinning chamber 4 for the tow.

[0040] Due to the relatively thick single-filament fineness and unique shape of the fiber, during the actual spinning process, when affected by the interference between the cooling air and the external wild air, the tow flutters abnormally, resulting in poor cooling uniformity of the fiber and affecting the shaping effect of the product. Therefore, a row of godets 6 is added between the screen plate and the channel, and through the godets 6, the running path of the fiber in the side air-blowing can be effectively guided, reducing the fluttering of the fiber caused by the influence of the air flow, thereby improving the uniformity of the fiber.

[0041] Furthermore, it is improved that the oil wheel device 8 is arranged at the discharge port of the channel.

[0042] In the existing process, oiling is done in the spinning chamber 4, and generally oiling is done by an oil nozzle. The cooled tow is first oiled before entering the tunnel, which limits the cooling space of the existing device. In addition, since the monofilament is thick, it is difficult to ensure uniformity after oiling by the oil nozzle. It is easy to have uneven oiling on the side of the tow on the other side of the oil outlet and on the front, which affects the effect of dyeing in the later stage. After improvement, the oil tanker device 8 is used to oil instead of the oil nozzle, and the crude oil rack is removed, so that the tow remains in its original state. When cooled by side-blowing air, the outlet length of the cooling air can be extended to achieve the best cooling effect. The oil tanker oiling is completed in the winding section, which will not affect the cooling effect of spinning. The oiling is carried out by an oil tanker device 8 and its position is adjusted to the outlet end of the spinning tunnel 7, so that the spinning chamber 4 between the spinning assembly 2 and the spinning tunnel 7 only plays the role of side-blowing air cooling and shaping. The oiling is carried out by the oil tanker device 8, and uniform oiling can be achieved, so that the uniformity during oiling is better, and the uniformity of later dyeing is better, and the color will not be uneven after coloring due to uneven oiling in the early stage.

[0043] As a further improvement, the inlet and outlet of the pre-network 17 and the main network 14 are both provided with a row of wire guide hooks 9 .

[0044] Since the 12F tow is relatively thick, it is easy to jitter after the span is large, so that after the tow enters the pre-network 17 and the main network 14, the oiling is uneven and the network points are uneven due to jitter or jumping. Therefore, a row of wire guide hooks 9 are added to the inlet and outlet of the pre-network 17 and the main network 14. The distance from the wire guide hooks 9 to the pre-network 17 and the main network 14 is about 18cm-20cm. After the wire tow is limited by the wire guide hooks 9, when the wire tow is subjected to the pre-network 17 and the main network 14, the trajectory of each wire tow is limited by the wire guide hooks 9 at the inlet and outlet. This can avoid the problem of poor uniformity of the oiled tow after entering the pre-network 17, and can also avoid the problem of poor network point uniformity of the tow after passing through the main network 14.

[0045] A further improvement is that a separator rod 10 is provided between the SR1 separator roller 11 and the pre-network 17 .

[0046] Since the filament bundle is relatively thick, it is easy to shake when entering the SR1 filament separation roller 11, resulting in entanglement with adjacent filament bundles or increased breakage rate. Therefore, a separate filament separation rod 10 is added before entering the SR1 filament separation roller 11 after coming out of the pre-network 17. This can effectively avoid the occurrence of this problem. The spacing between the filament separation rod 10 and the SR1 filament separation roller 11 is less than 27cm-30cm.

[0047] A further improvement is that a separator rod 10 is provided between the GR1 heat roller 12 and the GR2 heat roller 16 .

[0048] When the fiber is stretched and shaped between the GR1 hot roller 12 and GR2, since the produced fiber has a triangular cross-section and the monofilament is much thicker than normal, it is impossible to ensure the position of the contact surface, and the span is relatively long, which easily leads to fluctuations after the tension is set, resulting in problems of over-stretching or relaxation of the fiber. Therefore, when the fiber is stretched and shaped, a wire dividing rod 10 is installed between the GR1 hot roller 12 and GR2. Through the guidance of the wire dividing rod 10, the tension of the fiber can be better controlled, avoiding over-stretching or relaxation of the fiber, and ensuring the physical properties of the fiber.

[0049] Further improvement is that the temperature of the GR1 hot roller 12 is 115 ± 0.5 °C, and the temperature of the GR2 hot roller 16 is 160 ± 0.5 °C.

[0050] Generally, the temperature of the GR1 hot roller 12 in the equipment is about 98 °C, and then the temperature of the GR2 hot roller 16 is about 150 °C. However, it is found that when producing triangular filaments, there are problems of large shrinkage rate deviation and bull tendon filaments in the formed fibers, resulting in poor dyeing effect in the later stage. Therefore, the temperatures of the GR1 hot roller 12 and the GR2 hot roller 16 are adjusted. When the temperature is about 115 °C, the occurrence frequency of bull tendon filaments can be reduced. When the temperature of the GR2 hot roller 16 is adjusted to about 160 °C, not only the forming effect is significantly improved, the shrinkage rate is controlled, but also the occurrence probability of bull tendon filaments is further controlled.

[0051] Still further improvement is that the diameter of the GR1 hot roller 12 is 23.5 cm, the diameter of the GR2 hot roller 16 is 23.5 cm, the inclination angle of the GR1 hot roller 12 and the GR2 hot roller 16 is 3 - 5 °, and the number of fiber winding turns on each hot roller is 8.5 or 9.5 turns.

[0052] Due to the relatively large denier of the monofilament of this product, the conventional hot roll is horizontally arranged, and the number of winding turns is 7.5. When producing polyester drawn triangular filaments, not only is the process spinning speed low, but also problems such as hairiness and frequent broken filaments are likely to occur, resulting in a consistently low first-class product rate. In order to ensure that each fiber is evenly heated and increase production capacity, the GR1 hot roll 12 is changed from the original length of 32.5 cm and diameter of 19 cm to a length of 37.5 cm and a diameter of 23.5 cm; the GR2 hot roll 16 is changed from the original length of 32.5 cm and diameter of 19 cm to a length of 37.5 cm and a diameter of 23.5 cm. The increase in the volume of the hot roll not only reduces the temperature fluctuation, increases the contact arc length between the tow and the roll surface, but also further increases the spinning speed. With a higher draw ratio, the orientation degree and strength consistency of the fiber are improved. By increasing the length, the number of winding turns of the original hot roll that could only wind 7.5 turns can be increased to 9.5 turns, thus solving the problem that it is difficult to evenly heat each fiber in the one-step drawing method. Effective stretching and setting can be achieved without adding hot rolls, and the production process is more energy-saving and environmentally friendly.

[0053] Further improvement is made such that the wind speed in the spinning tow chamber 4 is 0.70 ± 0.02 m / s; the height of the windless zone 3 on the spinning tow chamber 4 is 10 CM.

[0054] The windless zone 3 is the physical space between the spinneret exit and the starting position of the cooling air. In this area, the fiber mainly relies on natural cooling for preliminary solidification. Currently, the height of the windless zone 3 in the spinning tow chamber 4 is fixed at 12 CM. During the production of triangular filaments, it is found that the molecular chain relaxation time is relatively long during the natural cooling stage, resulting in a decrease in the orientation degree. Therefore, the structure of the spinning tow chamber 4 is adjusted, and the height of the windless zone 3 is adjusted to 10 CM, reducing the melt relaxation time and better improving the orientation degree of the fiber.

[0055] Further improvement is made such that the process winding angle of the TMT winder 13 is 5.2° - 6.8°.

[0056] The conventional process winding angle is 3.6° - 4.1°. During the winding process of the filament, problems such as mutual crossing are likely to occur, resulting in an uneven surface of the cheese, local accumulation, uneven tightness of the cheese, and even deformation, looseness or edge collapse of some cheeses. Therefore, the process winding angle is studied and adjusted. The conventional process winding angle of 3.6° - 4.1° is adjusted to 5.2° - 6.8°, and the tension is strictly controlled. The poor formation of the cheese is greatly improved, and the success rate of subsequent unwinding is also increased.

[0057] Such as Figure 1As shown in the figure, a device for producing triangular polyester drawn yarn includes a spinning box 5, a spinning metering pump 1, a spinning pack 2, a windless zone 3, a spinning chamber 4, a spinning duct 7, a godet 6, an oiling roller device 8, a pre-network 17, an SR1 yarn splitting roller 11, a GR1 hot roller 12, a yarn splitting bar 10, a GR2 hot roller 16, an SR2 yarn splitting roller 15, a main network 14, and a TMT winding machine 13; the spinning metering pump 1, the spinning pack 2, and the windless zone 3 are sequentially arranged in the spinning box 5 from top to bottom, the spinning chamber 4 and the spinning duct 7 are located below the windless zone 3, the godet 6 is arranged in the middle of the spinning chamber 4 and the spinning duct 7, and the oiling roller device 8 is arranged outside the outlet of the spinning duct 7; a yarn splitting bar 10 is arranged between the pre-network 17 and the SR1 yarn splitting roller 11 and between the GR1 hot roller 12 and the GR2 hot roller 16, guide hooks 9 of the rear row are arranged at the inlets and outlets of the pre-network 17 and the main network 14, there are 6 guide hooks 9 in a row on both sides of the main network 14, a row of guide hooks 9 is arranged on one side of the outlet of the oiling roller device 8, a yarn splitting bar 10 is arranged between two rows of guide hooks 9 between the oiling roller device 8 and the pre-network 17, a yarn splitting bar 10 is further arranged at the outlet end of the pre-network 17, two sets of side air blowing mechanisms are arranged on the spinning chamber 4, and the added second set of side air blowing mechanisms is located at the spinning duct 7 in the original oiling nozzle area. By removing the oiling structure of the nozzle, the second set of side air blowing mechanisms can be installed after removing one side of the duct, so as to further ensure that the 12F triangular thick polyester drawn yarn has sufficient cooling effect. Through the improvement of the equipment and the adjustment of the process method, the equipment for direct melt spinning can produce triangular bright profiled polyester drawn yarn through one-step drawing, and abnormal yarns will no longer appear frequently during the production of thick yarns of 12F and above, ensuring the quality stability of the product and avoiding the problem of uneven coloring in the subsequent process.

[0058] The above embodiments are only the preferred embodiments of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and substitutions made by those skilled in the art based on the present application belong to the scope of protection required by the present application.

Claims

1. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method, characterized in that: The production steps include: S1. React two raw materials, PTA and EG, through a polymerization device to form a polyester melt, and inject the polyester melt into a spinning metering pump (1) on a spinning box (5) through a melt pipeline; S2. After the polyester melt injected in step S1 is extruded through a spinning component (2), it is cooled and shaped in a spinning silk chamber (4) and oiled by an oil wheel device (8). The spinning component (2) is provided with spinneret holes (18) having 12 triangular holes, and the spinneret holes (18) are distributed in a staggered manner in two inner and outer circles; S3. The oiled tow passes through a pre-network (17) and then enters an SR1 splitting roller (11), a GR1 hot roller (12), a GR2 hot roller (16), and an SR2 splitting roller (15) for combined heating, stretching, and shaping; S4. The tow after heating, stretching, and shaping in step S3 passes through a main network (14) to combine two 12F tows into a 24F tow, and finally is wound by a TMT winding machine (13).

2. The method for producing triangular polyester drawn filaments by a one-step stretching and setting method according to claim 1, characterized in that: A row of wire guides (6) is provided between the side air-blowing grid plate of the spinning silk chamber (4) and the spinning duct (7) for the tow.

3. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method according to claim 2, characterized in that: The oil wheel device (8) is arranged at the discharge port of the spinning duct (7).

4. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method according to claim 1, characterized in that: A row of wire guide hooks (9) is provided at both the inlet and outlet of the pre-network (17) and the main network (14).

5. A method for producing triangular polyester drawn filaments by a one-step stretching and setting method according to claim 1, characterized in that: A splitting rod (10) is provided between the SR1 splitting roller (11) and the pre-network (17).

6. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method according to claim 5, characterized in that: A splitting rod (10) is provided between the GR1 hot roller (12) and the GR2 hot roller (16).

7. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method according to claim 6, characterized in that: The temperature of the GR1 hot roller (12) is 115 ± 0.5 °C, and the temperature of the GR2 hot roller (16) is 160 ± 0.5 °C.

8. A method for producing triangular polyester drawn yarn by a one-step stretching and shaping method according to claim 7, characterized in that: The diameter of the GR1 hot roller (12) is 23.5 cm, the diameter of the GR2 hot roller (16) is 23.5 cm, the inclination angle of the GR1 hot roller (12) and the GR2 hot roller (16) is 3 - 5 °, and the number of fiber turns on each hot roller is 8.5 or 9.5 turns.

9. A method for producing triangular polyester drawn yarn by a one-step stretching and setting method according to claim 1, characterized in that: The wind speed in the spinning silk chamber (4) is 0.70 ± 0.02 m / s; the height of the windless area (3) on the spinning silk chamber (4) is 10 CM.

10. A method for producing triangular polyester drawn filaments by a one-step stretching and setting method according to claim 1, characterized in that: The process winding angle for winding by the TMT winding machine (13) is 5.2° - 6.8°.

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