Wave flat DTY fiber and elasticizing processing method thereof

Abstract

The invention discloses a wave flat DTY (draw textured yarn) fiber and an elasticizing processing method thereof, which successfully solves the technical problems of deformation, scratching, broken filaments and the like which are easy to generate in the production of special-shaped cross-section fibers by adopting linear wave flat cross-section POY (pre-oriented yarn) as a raw material and combining a low-damage processing technology. Wherein due to the extremely high surface smoothness of the rotary yarn guide made of the nanometer aluminum oxide ceramic material, the friction damage in the fiber feeding process is remarkably reduced, and the fiber form integrity is effectively protected; the double-side symmetrical vortex air supply cooling system achieves uniform and stable cooling of the filaments, and it is ensured that the section structure and the curling form of the filaments are efficiently fixed. The finally prepared DTY fiber not only is high in section retention rate and excellent in mechanical property, but also gives full play to the specific capillary effect and soft gloss of the wave flat structure, and endows terminal fabrics with excellent moisture-conducting and quick-drying properties and high-end texture.

Description

Technical Field

[0001] This invention relates to the field of DTY fiber materials, and in particular to a wavy flat DTY fiber and its texturing process. Background Technology

[0002] With the upgrading of consumption and the popularization of healthy living concepts, the demand for functional fabrics in the modern textile market is growing. High-end sportswear, outdoor equipment, and intimate apparel are no longer satisfied with just basic clothing needs, but are pursuing a comprehensive experience that combines excellent moisture management, comfortable feel, and unique aesthetic value. Against this backdrop, endowing fabrics with properties such as moisture wicking, quick drying, softness, and a gentle luster through fiber cross-section shaping has become an important research direction and development trend in the field of fiber materials.

[0003] Among various irregularly shaped cross-section fibers, the straight-line wavy flat cross-section fiber is widely recognized for its significantly increased specific surface area and unique capillary effect, which greatly enhances the wicking efficiency and quick-drying properties of fabrics, while also providing a velvety soft and smooth feel and elegant luster. However, the fiber's enormous application potential is limited by its demanding processing requirements. Its flat and irregular geometry presents more severe technical challenges than conventional round cross-section fibers during subsequent texturing (false twisting) processing.

[0004] Currently, the industry generally lacks a dedicated texturing process for fibers with this special cross-section, and most still use conventional techniques for processing round cross-section polyester. This leads to two prominent technical challenges: First, the flat cross-section increases the contact area between the filament and the guide and false twisting disc, resulting in intense friction during high-speed processing. Conventional metal guides easily scratch the filament surface, leading to high rates of fuzz and breakage. Second, the lack of effective control over cross-sectional deformation during heating and false twisting processes easily causes the corrugated flat structure to collapse and become rounded, resulting in the loss of its unique functional advantages, large fluctuations in product performance, and low yield. Therefore, developing a dedicated texturing process with low damage and high shape preservation is key to realizing the industrial application of corrugated flat DTY fibers. Summary of the Invention

[0005] In view of the above problems, a wavy flat DTY fiber and its texturing process are proposed to overcome or at least partially solve the above problems, specifically: A texturing process for wavy flat DTY fiber includes: using POY yarn with a cross-section of I-shaped wavy flatness and a cross-section length-to-width ratio ≥ 2.5 as raw material, and feeding, heating, false twisting, cooling, shaping and winding to obtain wavy flat DTY fiber; Among them, the fineness specification of the POY yarn with a straight wavy flat cross section is 51dtex / 36f; The feeding process uses a rotary wire guide with an inner wall made of nano-alumina ceramic material, and its surface roughness Ra≤0.05μm; The cooling process uses a double-sided symmetrical vortex air supply system to cool the filaments.

[0006] Optionally, a 1-4-1 disc combination is used for false twisting, with the temperature controlled at 145-175℃ during the heating step and 135-155℃ during the setting step.

[0007] Optionally, the texturing process for wavy flat DTY fibers includes the following steps: 1) Feeding: POY yarn with a flat, wavy cross-section and a length-to-width ratio ≥ 2.5 is used as the raw yarn and introduced into the texturing machine through a rotating yarn guide; 2) Heating: The raw yarn enters the first heating box for heating, and the temperature of the first heating box is controlled at 145-175℃; 3) False twist: The heated yarn enters the false twist zone and is false twisted using a 1-4-1 disc assembly; 4) Cooling: The false-twisted yarn is cooled; 5) Shaping: The cooled filaments enter the second heating box for shaping. The temperature of the second heating box is 135-155℃. 6) Winding: The shaped filaments are wound at a constant winding speed to produce wavy flat DTY filaments.

[0008] Optionally, the winding speed is 600-800m / min and the winding tension is 8-16cN.

[0009] Optionally, the ratio of the surface linear velocity D of the false twister friction disc to the velocity Y of the filament leaving the false twister is 1.620.

[0010] Optionally, the first hot box adopts a three-stage gradient temperature control, which divides the inlet to the outlet into three temperature zones, with temperatures set at 150±1℃, 160±1℃ and 170±1℃ respectively; the second hot box adopts a reverse gradient temperature control, with the inlet temperature set at 150±1℃ and the outlet temperature set at 140±1℃.

[0011] Optionally, the air supply speed is controlled at 0.5±0.02m / s, the air supply direction is at an angle of 10-15° to the direction of the wire running, and the length of the cooling zone is 1.2m.

[0012] Optionally, during the false twisting process, the surface of the false twisting disc is coated with a diamond-like coating.

[0013] The present invention also provides a wavy flat DTY fiber, which is obtained by the method described above.

[0014] This invention successfully solves the technical challenges of deformation, scratches, and fuzzing that easily occur in the production of irregularly shaped cross-section fibers by using POY yarn with a straight, wavy, flat cross-section as raw material and combining it with a low-damage processing technology. Specifically, the rotating yarn guide made of nano-alumina ceramic material, with its extremely high surface smoothness, significantly reduces frictional damage during fiber feeding, effectively protecting the integrity of the fiber morphology. The double-sided symmetrical vortex air cooling system achieves uniform and stable cooling of the yarn, ensuring efficient fixation of its cross-sectional structure and crimp shape. The resulting DTY fiber not only has a high cross-sectional retention rate and excellent mechanical properties, but also fully utilizes the unique capillary effect and soft luster of the wavy, flat structure, giving the finished fabric excellent moisture-wicking and quick-drying properties and a high-end texture. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a method for texturing wavy flat DTY fibers provided in an embodiment of the present invention; Figure 2 This is a temperature control curve of the hot box provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a method for texturing wavy flat DTY fibers, comprising: POY yarn with a flat, wavy cross-section and an aspect ratio ≥ 2.5 is used as raw material. The yarn is fed, heated, false-twisted, cooled, shaped, and wound to produce wavy flat DTY fiber. The fineness of the POY yarn with a flat, wavy cross-section is 51 dtex / 36f. The feeding process uses a rotary yarn guide with an inner wall of nano-alumina ceramic material and a surface roughness Ra ≤ 0.05 μm. The cooling process uses a double-sided symmetrical vortex air supply system to cool the yarn.

[0019] In this process, a 1-4-1 disc combination is used for false twisting. The temperature is controlled at 145-175℃ during the heating step and at 135-155℃ during the setting step.

[0020] Specifically, the following steps are included: 1) Feeding: POY yarn with a flat, wavy cross-section and a length-to-width ratio ≥ 2.5 is used as the raw yarn and introduced into the texturing machine through a rotating yarn guide; 2) Heating: The raw yarn enters the first heating box for heating, and the temperature of the first heating box is controlled at 145-175℃; 3) False twist: The heated yarn enters the false twist zone and is false twisted using a 1-4-1 disc assembly; 4) Cooling: The false-twisted yarn is cooled; 5) Shaping: The cooled filaments enter the second heating box for shaping. The temperature of the second heating box is 135-155℃. 6) Winding: The shaped filaments are wound at a constant winding speed to produce wavy flat DTY filaments. The specific technical details of each process are as follows: I. Raw Material Preparation This invention uses POY yarn of a specific specification as raw material. The POY yarn has a flat, wavy cross-section with an aspect ratio ≥2.5. This unique cross-section is fundamental to imparting excellent moisture-wicking properties, bulkiness, and a special luster to the final DTY fiber. The POY yarn has a fineness specification of 51 dtex / 36f, ensuring suitable mechanical properties and processability in subsequent processing. The processing equipment can be a TMT-1500 single-strand texturing machine.

[0021] Understandably, flat cross-sections with an aspect ratio ≥ 2.5 have a much larger specific surface area than round fibers. A larger surface area means a greater contact area with water molecules, resulting in superior moisture conductivity. For the same material and cross-sectional area, the moment of inertia of a flat cross-section in its width direction is much greater than that of a round cross-section. This means it has higher bending stiffness, the fibers are less prone to bending, and it appears more fluffy. Furthermore, the larger the aspect ratio, the wider the light-reflecting plane, resulting in more effective light scattering and a softer, deeper, and more sophisticated luster.

[0022] II. Texturing Process Flow 1. Feeding process To minimize surface damage and fuzz caused by friction between the filament and the guide, this invention employs a rotating guide with an inner wall made of nano-alumina ceramic. This guide not only rotates at high speed to transform sliding friction into rolling friction, but its inner wall is also precision polished, with a surface roughness (Ra) controlled below 0.05 micrometers (μm), creating an extremely smooth channel. This ultra-smooth ceramic surface effectively prevents scratching the fragile edges and corners of the wavy, flat cross-section, ensuring the filament enters the subsequent hot box intact, a prerequisite for guaranteeing the high quality of the final product.

[0023] 2. Heating process The fed filaments enter the first heating chamber for heating. The temperature control range of the first heating chamber is set between 145℃ and 175℃. At this temperature, the filaments are uniformly heated above their glass transition temperature, the macromolecular chain segments gain sufficient mobility, and the fibers become soft and malleable, fully preparing them for subsequent false twisting deformation. Understandably, excessively high temperatures may cause the fibers to become brittle, reduce strength, and make the cross-section prone to deformation and collapse under tension, and may also cause thermal degradation.

[0024] The first hot box can adopt a three-stage gradient temperature control, which is divided into three temperature zones from the inlet to the outlet, with temperatures set at 150±1℃, 160±1℃ and 170±1℃ respectively.

[0025] Specifically, the first heating chamber can be physically divided into three independent heating chambers, each with insulation to reduce thermal interference. Each temperature zone is equipped with its own independent heater and high-precision temperature sensor. Simultaneously, each temperature zone can have an independently controlled hot air circulation system to ensure uniform and stable hot air flow within the chamber, allowing the filament to be heated evenly at every point. The PLC then uses a PID algorithm to compare the set temperature value with the measured temperature value in real time and dynamically adjusts the heating power, thereby strictly controlling fluctuations within ±1℃.

[0026] Understandably, the first inlet zone is set at 150℃. The filament is preheated uniformly and comprehensively in this zone to above its glass transition temperature, initiating initial movement of the macromolecular chains and preparing for subsequent deeper heating, effectively avoiding thermal shock. The second intermediate zone is set at 160℃. After preheating, the filament enters this core zone. At this temperature, the amorphous molecular chains of the fiber have sufficient mobility, allowing for adequate orientation and crystal rearrangement under the action of the false twister, resulting in good crimping properties. Simultaneously, the temperature is far below its melting point, maximizing the preservation of the pre-set flat cross-sectional shape. The third outlet zone is set at 170℃. In the final stage before leaving the hot box and entering the false twister, this zone ensures that the filament reaches and stabilizes at the required maximum processing temperature from core to surface. This guarantees that the filament's physical state is completely uniform and stable upon entering the false twist zone, providing the crucial thermal guarantee for achieving a uniform false twist effect. This progressive heating mode can, to some extent, solve the problems of uneven heating and easy deformation in the processing of irregularly shaped cross-section fibers.

[0027] 3. False twisting process The heated and plasticized filaments enter the false twister. This embodiment of the invention employs a 1-4-1 disc combination (one inlet disc, four middle discs, and one outlet disc) for false twisting. Compared to the traditional 1-5-1 combination, this combination reduces one friction disc, lowering the total contact pressure and frictional heat accumulation with the filament, resulting in a gentler false twisting method. It can impart sufficient false twist to the filament while significantly reducing mechanical wear and deformation on the wavy, flat cross-section, contributing to a high recovery rate of the cross-sectional shape after processing. The surface of the false twisting discs can be coated with a diamond-like carbon (DLC) coating. The DLC coating has an extremely low coefficient of friction and extremely high hardness, further protecting the filament from damage during false twisting.

[0028] 4. Cooling process After false twisting, the high-temperature filaments must be cooled to temporarily fix their deformed shape. This invention employs a double-sided symmetrical vortex air supply system to cool the moving filaments. This system symmetrically and uniformly supplies cooling air from both sides of the cooling pipe, forming a stable vortex field and avoiding problems such as uneven cooling and filament swaying that may occur with unilateral air supply. Uniform and stable cooling ensures consistent crystallization and morphological solidification processes along the entire length of the filament, effectively preventing defects such as poor subsequent dyeing and performance fluctuations caused by uneven cooling. Specifically, the air supply velocity is controlled at 0.5±0.02 m / s, the air supply direction forms a 10-15° angle with the filament running direction, and the cooling zone length is 1.2 m.

[0029] 5. Shaping process After cooling, the filaments enter a second heating chamber for heat treatment to set their shape. The temperature of the second heating chamber is set between 135°C and 155°C, which is lower than that of the first heating chamber. During this stage, the filaments undergo heat relaxation under lower tension, eliminating the internal stress caused by false twisting. The macromolecular chain segments rearrange and crystallize in a new morphology, thereby permanently stabilizing the crimped shape and cross-sectional structure caused by false twisting, significantly improving the fiber's shrinkage stability and dimensional stability.

[0030] The second hot box can use reverse gradient temperature control, with the inlet temperature set to 150±1℃ and the outlet temperature set to 140±1℃.

[0031] Specifically, the second heating chamber can be divided into multiple independent temperature zones along its length, each zone equipped with an independent heating element and a high-precision temperature sensor. The central control system, based on a preset decreasing temperature curve, uses a PID algorithm to compare the measured values ​​of each zone with the target temperature in real time, and dynamically adjusts the power output of the corresponding heaters. This maintains temperature environments of 150℃, 145℃, and 140℃ in the inlet, middle, and outlet areas respectively, ensuring that the filament undergoes uniform and controllable heat treatment throughout the entire process. Simultaneously, each independent temperature zone can be equipped with a hot air circulation system to ensure uniform temperature distribution within the zone and avoid dead zones of localized overheating or undercooling.

[0032] Understandably, after the filament has undergone false twisting and cooling, the molecular chains are in a state of high stress and high orientation, but not yet fully stable. Entering the second heating chamber at a relatively high temperature can quickly provide sufficient energy to the fiber macromolecular chains, enhancing their segment mobility. This helps to rapidly relieve some of the internal stress generated during false twisting, allowing the molecular chain alignment to begin to relax. As the filament moves forward in the heating chamber, the temperature gradually decreases. The mobility of the molecular chains gradually weakens accordingly. This gradual thermal relaxation process from high to low temperature can more thoroughly eliminate internal stress, resulting in higher final fiber crimp stability.

[0033] The reverse gradient design creates a relatively mild inlet. Although 150°C is higher than the outlet, it is still much lower than the processing temperature of the first hot box, which avoids thermal shock to the fragile irregular cross-section and prioritizes the retention rate of the cross-section.

[0034] 6. Winding process Finally, after the DTY yarn has been shaped and oiled by the oiling roller, it is wound by the winding head at a constant speed and tension into a bobbin of the specified shape and weight. The winding tension must be kept stable to avoid damaging the fibers or causing poor forming due to tension fluctuations.

[0035] In a preferred embodiment, the winding speed is 600-800 m / min and the winding tension is 8-16 cN.

[0036] In a preferred embodiment, the ratio of the surface linear velocity D of the false twister friction disc to the velocity Y of the filament leaving the false twister is 1.620.

[0037] This invention successfully solves the technical challenges of deformation, scratches, and fuzzing that easily occur in the production of irregularly shaped cross-section fibers by using POY yarn with a straight, wavy, flat cross-section as raw material and combining it with a low-damage processing technology. Specifically, the rotating yarn guide made of nano-alumina ceramic material, with its extremely high surface smoothness, significantly reduces frictional damage during fiber feeding, effectively protecting the integrity of the fiber morphology. The double-sided symmetrical vortex air cooling system achieves uniform and stable cooling of the yarn, ensuring efficient fixation of its cross-sectional structure and crimp shape. The resulting DTY fiber not only has a high cross-sectional retention rate and excellent mechanical properties, but also fully utilizes the unique capillary effect and soft luster of the wavy, flat structure, giving the finished fabric excellent moisture-wicking and quick-drying properties and a high-end texture.

[0038] The present invention also provides a wavy flat DTY fiber, which is obtained by the method described above.

[0039] Among them, the fineness specification of the wavy flat DTY fiber is 32-33dtex / 36f, the breaking strength is ≥3.2-3.3cN / dtex, the breaking elongation is 21.0-23.0%, and the shrinkage stability is ≥70.0%.

[0040] Among them, the breaking strength and breaking elongation were tested according to the standard GB / T14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments; the crimping stability was tested according to the standard GB / T6506-2001 Test Method for Crimping Properties of Synthetic Fiber Textured Yarns.

[0041] The above is the general concept of the present invention. The following detailed embodiments are provided to further illustrate the present invention.

[0042] Example 1. Raw material preparation: POY yarn with a specification of 51dtex / 36f is used as raw material. Its cross-section is confirmed by microscopic examination to be a flat, wavy shape with a length-to-width ratio of 2.8.

[0043] The POY yarn is produced by melt spinning semi-dull polyester chips with an intrinsic viscosity of 0.65 dl / g using a special shaped spinneret.

[0044] Specific steps may include: Pretreatment: Semi-dull polyester chips with a viscosity of 0.65 dl / g can be fed into a drum or packed drying tower and dried at 140-160℃ for 4-6 hours to reduce the moisture content to below 0.003% and prevent hydrolytic degradation.

[0045] Melting: The dried slices are fed into the screw extruder at a constant speed through the screw feeder, so that they are uniformly melted in the screw extruder at 265-285℃.

[0046] Metering: The melt is output at constant pressure and flow rate via a precision metering pump.

[0047] Spinning: The melt is extruded through the micropores of a special straight-line wavy flat spinneret, and then uniformly cooled and solidified by a ring blower at 20±2℃, replicating the shape of the spinneret holes to form an irregular cross-section with an aspect ratio of ≥2.5.

[0048] Winding: After the filament bundle is oiled through the oil nozzle, it is wound at a speed of 3000-3200m / min to obtain POY precursor yarn.

[0049] 2. Equipment and Process Parameters: The processing equipment selected is the TMT-1500 single-strand texturing machine, and its key components are configured as follows: Feed guide: A rotary wire guide with an inner wall of nano-alumina ceramic material is used, and its surface roughness is Ra=0.04μm as measured by a profilometer.

[0050] False twister: It adopts a 1-4-1 disc combination, and all false twist discs are coated with diamond-like carbon (DLC) to reduce the coefficient of friction.

[0051] Cooling system: A dual-sided symmetrical vortex air supply system is activated, with the wind speed set at 0.5 m / s. The air supply direction forms a 15° angle with the direction of the filament running, and the cooling zone is 1.2 meters long.

[0052] Control system: The heating box adopts an independent temperature control system, and the winding tension adopts a PID control system.

[0053] 3. Texturing process Reference Figure 1 , Figure 2 The above-mentioned POY raw yarn is then processed according to the following process flow and parameters, referring to... Figure 1 : Feeding: POY yarn is smoothly introduced into the texturing machine through the nano-ceramic rotating guide, which effectively reduces the initial frictional damage to the fiber.

[0054] Heating: The filament enters the first heating chamber. This first heating chamber uses a three-stage gradient heating method to ensure that the filament reaches the required temperature evenly and gradually from the surface to the inside, avoiding localized overheating or thermal shock that could cause cross-sectional deformation. The temperature of the inlet section (Zone 1) is set to 150℃ to preheat the yarn.

[0055] The middle zone (Zone 2) is set to 160℃ and is the main heating and plasticizing zone.

[0056] The temperature of the exit section (Zone 3) is set to 170℃ to ensure that the core of the yarn also reaches a uniform plasticizing temperature, thus making full preparation for false twisting.

[0057] False twist: The heated filament enters the false twist zone composed of DLC discs for false twist deformation. The processing speed is set to 700m / min, and the D / Y ratio is set to 1.62.

[0058] Cooling: The false-twisted filaments immediately enter the double-sided symmetrical vortex air cooling zone, where they are cooled evenly and stably to initially fix the curl and cross-sectional shape.

[0059] Shaping: After cooling, the yarn enters a second heating chamber for relaxation and shaping. This chamber uses reverse gradient temperature control. The temperature of the inlet section (Zone 1) is set to 150℃.

[0060] The temperature in the middle zone (Zone 2) is set to 145°C.

[0061] The temperature of the outlet section (Zone 3) is set to 140℃.

[0062] The filaments undergo gradual thermal relaxation, allowing the molecular chain stress to be fully released and the structure to stabilize.

[0063] Winding: After the shaped filaments are oiled through the oiling nozzle, they are wound with a constant tension of 12±1cN under the control of the PID controller, and finally made into a 3.0kg DTY filament spool.

[0064] 4. Product performance testing The properties of the prepared DTY fibers were tested, and the results are as follows: Fiber specifications: 33dtex / 36f.

[0065] Cross-sectional morphology: Observation by scanning electron microscope (SEM) shows that the fiber still maintains a clear straight-line wavy flat structure with a cross-sectional length-to-width ratio of 2.7, and the calculated cross-sectional retention rate is 96.4%.

[0066] Mechanical properties: The breaking strength is 3.5 cN / dtex, and the elongation at break is 22.8%.

[0067] Curling performance: Curling stability CSF≥80%.

[0068] Functional performance: Its knitted fabric (warp and weft knit) achieves a wicking height of 13.5cm / 30min and a moisture evaporation rate of 0.38g / h, demonstrating excellent moisture-wicking and quick-drying properties. The fabric surface exhibits a soft and elegant pearly luster and a fluffy and smooth feel.

[0069] This embodiment produces high-performance linear wavy flat DTY fibers. By employing a synergistic process of low-friction ceramic guides, a gentle 1-4-1 disc combination, precise reverse gradient heat setting, and uniform and controllable cooling, fuzz and surface defects are significantly reduced, improving the overall integrity of the filaments. Simultaneously, while ensuring good fiber elasticity, the core "linear wavy flat" cross-sectional structure is highly preserved, effectively solving the technical challenge of easy damage and deformation of high-proportion irregular cross-section fibers during texturing.

[0070] The above provides a detailed description of a wavy flat DTY fiber and its texturing process. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A texturing process for wavy, flat DTY fibers, characterized in that, The method is as follows: using POY yarn with a flat, wavy cross-section and a cross-sectional aspect ratio ≥ 2.5 as raw material, the wavy flat DTY fiber is obtained by feeding, heating, false twisting, cooling, shaping, and winding. The fineness specification of the POY yarn with a straight, wavy, flat cross section is 51 dtex / 36f. The feeding process uses a rotary wire guide with an inner wall made of nano-alumina ceramic material, and its surface roughness Ra≤0.05μm; The cooling process employs a dual-sided symmetrical vortex air supply system to cool the filaments.

2. The texturing method for wavy flat DTY fibers according to claim 1, characterized in that, in, The false twisting process is performed using a 1-4-1 disc combination. The temperature is controlled at 145-175℃ during the heating step and at 135-155℃ during the setting step.

3. The texturing process for wavy flat DTY fibers according to claim 1 or 2, characterized in that, Specifically, the following steps are included: 1) Feeding: POY yarn with a flat, wavy cross-section and a length-to-width ratio ≥ 2.5 is used as the raw yarn and introduced into the texturing machine through a rotating yarn guide; 2) Heating: The raw yarn enters the first heating box for heating, and the temperature of the first heating box is controlled at 145-175℃; 3) False twist: The heated yarn enters the false twist zone and is false twisted using a 1-4-1 disc assembly; 4) Cooling: The false-twisted yarn is cooled; 5) Shaping: The cooled filaments enter the second heating box for shaping. The temperature of the second heating box is 135-155℃. 6) Winding: The shaped filaments are wound at a constant winding speed to produce wavy flat DTY filaments.

4. The texturing method for wavy flat DTY fibers according to claim 3, characterized in that, The winding speed is 600-800 m / min, and the winding tension is 8-16 cN.

5. The texturing method for wavy flat DTY fibers according to claim 4, characterized in that, The ratio of the surface linear velocity D of the false twister friction disc to the velocity Y of the yarn leaving the false twister is 1.

620.

6. The texturing method for wavy flat DTY fibers according to claim 3, characterized in that, The first hot box adopts a three-stage gradient temperature control, which is divided into three temperature zones from the inlet to the outlet, with temperatures set at 150±1℃, 160±1℃ and 170±1℃ respectively; the second hot box adopts a reverse gradient temperature control, with the inlet temperature set at 150±1℃ and the outlet temperature set at 140±1℃.

7. The texturing process for wavy flat DTY fibers according to claim 6, characterized in that, The air supply speed is controlled at 0.5±0.02m / s, the air supply direction is at an angle of 10-15° to the direction of the wire running, and the length of the cooling zone is 1.2m.

8. The texturing process for wavy flat DTY fibers according to claim 7, characterized in that, In the false twisting process, the surface of the false twisting disc is coated with a diamond-like coating.

9. A wavy, flat DTY fiber, characterized in that, It is obtained by the method described in any one of claims 1-9.

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