Moisture-absorbing and sweat-absorbing polyester low-elasticity yarn and preparation method thereof

Abstract

The application discloses a moisture-absorbing and sweat-releasing polyester low-elasticity filament, which comprises 85-95 parts of a copolymer type moisture-absorbing modified polyester chip, 3-8 parts of toughening compatible master batch and 2-7 parts of anti-oxidation lubrication functional master batch, and a preparation method of the moisture-absorbing and sweat-releasing polyester low-elasticity filament, which comprises the following steps: S1, drying raw materials; S2, melt extrusion; S3, pre-setting of a special-shaped section; S4, spinning cooling; S5, stretching and elasticizing; S6, wave curling setting; and S7, winding forming. According to the application, the section structure of the polyester low-elasticity filament is improved, the symmetrical crescent concave groove penetrating through the axial direction is formed, the natural capillary wetness guide path is constructed according to the inherent form of the filament body, the modification of the chemical hydrophilic coating is not needed, the integrated section groove structure is stable, the appearance can be kept complete after the weaving friction and multiple water washing, the long-lasting wicking water conveying capacity of the fabric is endowed from the fiber origin, and the disadvantage of the wetness performance attenuation after long-term use is avoided.

Description

Technical Field

[0001] This invention relates to the field of polyester rayon manufacturing technology, and in particular to a moisture-wicking, low-elasticity polyester filament and its preparation method. Background Technology

[0002] Polyester low-elasticity yarn is a type of chemical fiber filament produced from polyester chips through processes such as melt spinning, stretching, and false twist texturing. It belongs to the field of polyester rayon manufacturing technology. This type of fiber has the characteristics of high strength, good abrasion resistance, high dimensional stability, and good processing adaptability. After texturing, it can form a crimped structure, giving the fabric a certain degree of elasticity and bulkiness. Therefore, it is widely used in sports fabrics, knitted garments, close-fitting textiles, and functional fabrics.

[0003] In the prior art, in order to improve the moisture absorption and wicking ability of polyester low elastic yarn, hydrophilic modification components are usually added to the polyester raw materials and hydrophilic finishing is performed on the fiber surface; the hydrophilic finishing method mainly enhances the liquid diffusion ability by improving the wettability of the fiber surface, so as to meet the use requirements of sportswear and close-fitting fabrics.

[0004] However, in actual use, after repeated washing, friction, stretching and soaking in sweat, the surface finishing layer is prone to peeling, wear or migration, which leads to a gradual reduction in the number of hydrophilic groups on the fiber surface, resulting in a decrease in moisture absorption speed, a weakening of moisture wicking capacity and a reduction in perspiration efficiency.

[0005] Accordingly, this application proposes a moisture-wicking polyester low-elasticity yarn and its preparation method. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a moisture-wicking, perspiration-absorbing polyester low-elasticity yarn and its preparation method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A moisture-wicking polyester low-elasticity yarn, comprising the following formula:

[0009] 85-95 parts of copolymerized hygroscopic modified polyester chips;

[0010] 3-8 parts of toughening compatibility masterbatch;

[0011] Antioxidant and lubricating masterbatch, 2-7 parts;

[0012] This polyester low-elasticity yarn has a rounded rectangular monofilament cross section with two symmetrically arranged axially penetrating crescent-shaped concave grooves inside the cross section. The monofilament has a three-segment wavy irregular crimp configuration with alternating large arc, small arc and transition arc.

[0013] A method for preparing moisture-wicking polyester low-elasticity yarn includes the following steps:

[0014] S1. Raw material drying

[0015] The copolymerized moisture-absorbing modified polyester chips, toughening compatibility masterbatch, and antioxidant lubricating masterbatch, weighed and mixed according to the formula, are fed into a vacuum drying equipment for closed constant temperature drying treatment. The vacuum isolates the intrusion of external environmental moisture, so that the moisture content of the raw materials is reduced to the acceptable range for spinning, ensuring the stability of the rheological properties of the subsequent melt and avoiding problems such as bubbles, broken fibers and uneven fiber properties during the spinning process.

[0016] S2, Melt Extrusion

[0017] The dried and qualified mixed raw materials are fed into the screw extruder. The multi-stage zone gradient heating mode is used to gradually melt and plasticize the raw materials. The screw shears and mixes to achieve uniform compatibility of the melt components. Then, the melt is delivered quantitatively at constant pressure and constant flow through the metering pump to ensure a continuous and stable supply of melt.

[0018] S3, Irregular cross-section pre-type

[0019] The melt is extruded through a special custom-shaped spinneret to form a high-temperature nascent filament. The nascent filament is in a high-temperature, plastic, and uncured state. A radial temperature and wind speed gradient field is formed by circumferential side blowing to limit and constrain the outer contour and internal groove morphology of the nascent filament. A rounded rectangular composite cross-section structure with symmetrical crescent-shaped concave grooves is formed in one step.

[0020] S4, Spinning Cooling

[0021] The extruded nascent fibers with irregular cross sections are slowly cooled by a side-enclosed constant temperature and humidity cold air system, so that the fibers are gradually and uniformly solidified from the surface to the core, stabilizing the formed cross section profile and groove structure, and preventing internal stress distortion and groove closure failure caused by rapid cooling.

[0022] S5, Stretch and elastic

[0023] After cooling and solidification, the nascent fibers are smoothly pulled and conveyed by multiple sets of guide rollers. Under the conditions of set stretch ratio and equipment operating speed, hot stretching and mechanical false twist texturing composite processing are completed simultaneously to adjust the orientation regularity of fiber macromolecular chains and construct the basic crimp skeleton and elastic base of the filament.

[0024] S6, Wave Curl Shaping

[0025] After the stretching and texturing process and before the final winding, the yarn is continuously bent and shaped by a special biomimetic guide yarn path combined with a segmented heat setting temperature field, so that the yarn naturally forms a wave-like curling shape with large arc segments, small arc segments, and smooth transition arc segments in successive cycles, fixing the overall curling undulation pattern.

[0026] S7, Winding and forming

[0027] The wavy, crimped yarn is introduced into a network nozzle for light network weaving to improve the cohesion between monofilaments. Then, it is continuously and regularly wound with constant winding tension to obtain a finished yarn roll with uniform interlayer arrangement and dense roll structure, which is convenient for subsequent weaving and dyeing and finishing.

[0028] Preferably, the vacuum drying in S1 adopts a negative pressure constant temperature condition, which limits the vacuum degree, drying temperature and drying time, and precisely controls the moisture content of the mixed raw materials to below 30ppm, thereby avoiding uneven melt plasticization and spinning defects caused by the moisture content of the raw materials from the source.

[0029] Preferably, the screw extruder in S2 is equipped with multiple independent temperature control zones. Each zone is heated and melted in stages according to the temperature gradient setting, and the multi-component masterbatch and polyester chips are fully compatible and mixed by relying on the shearing action of the screw.

[0030] Preferably, the lateral cooling in S4 adopts a closed side-blowing structure. By precisely controlling the cooling wind speed, wind temperature and ambient humidity, a uniform and slow cooling condition is created to ensure that the irregular cross-section and internal groove structure are shaped and intact without collapsing.

[0031] Preferably, S5 adopts an integrated synchronous processing method of hot stretching and mechanical false twisting. By matching the fixed stretching ratio with the production line running speed, the orientation reconstruction of fiber macromolecules is achieved, giving the filament basic resilience and fluffiness.

[0032] Preferably, the two crescent-shaped concave grooves inside the monofilament are integrally formed into a continuous structure, running through the entire fiber axis without any breaks, which can spontaneously form capillary water transport channels to achieve rapid wicking and conduction of sweat.

[0033] Preferably, the monofilament three-segment wave crimping is a non-uniform arc alternating arrangement structure, which increases the space gap between monofilaments by relying on the staggered arrangement of arc segments, thereby improving the fabric's breathability, moisture dissipation, and compression resistance and resilience.

[0034] Preferably, S7 adopts a light-elasticity network node processing method, which only moderately enhances the cohesion of the monofilaments to prevent them from falling apart, without damaging the original irregular cross-section and wavy curl structure of the filaments, and maintains constant tension throughout the winding process.

[0035] The present invention has the following beneficial effects:

[0036] 1. By improving the cross-sectional structure of polyester low-elasticity yarn, symmetrical crescent-shaped concave grooves are formed through the axis. Natural capillary moisture-wicking channels are constructed by relying on the inherent shape of the yarn. There is no need to rely on chemical hydrophilic coating modification. The integrated groove structure is stable and can maintain its shape after weaving friction and multiple washings. It endows the fabric with a long-lasting core absorption and water transport capacity from the fiber source, avoiding the drawback of moisture-wicking performance degradation after long-term use.

[0037] Second, by adopting an integrated biomimetic wave guide rail, the guide rail trajectory is designed as a continuous smooth curve with alternating large arc segments, small arc segments, and transition arc segments, forming an alternating staggered three-segment wave curl configuration. The special curl shape can effectively increase the space gap between the yarns, improve the air circulation and fluffiness inside the fabric, and at the same time, the staggered arc segments reserve sufficient elastic deformation allowance for the yarn, avoiding the collapse and hardening of the yarn caused by weaving compression and daily wear pressure.

[0038] Third, by simultaneously combining the axially penetrating crescent-shaped concave groove structure with the three-segment wave-curled structure, the groove can continuously transport liquid along the length of the single filament, and the alternating space formed by the wave-curled structure can allow the liquid to continue to diffuse and transfer between the filaments, thereby constructing a continuously connected liquid transfer path and avoiding the concentration and stagnation of liquid in local filament bundle areas; at the same time, the wave-shaped space structure can provide a continuous flow area for liquid diffusion, so that the liquid forms a multi-directional dispersion state inside the fabric, reducing the skin-sticking moisture phenomenon caused by the continuous accumulation of liquid content in local areas. Attached Figure Description

[0039] Figure 1 This is an overall flow chart of the moisture-wicking polyester low-elasticity yarn and its preparation method proposed in this invention;

[0040] Figure 2 This is a top view of the irregularly shaped spinneret used in the moisture-wicking polyester low-elasticity yarn and its preparation method proposed in this invention.

[0041] Figure 3 This is a cross-sectional view of a moisture-wicking, perspiration-absorbing polyester low-elasticity yarn proposed in this invention;

[0042] Figure 4 This is a cross-sectional view of a moisture-wicking, low-elasticity polyester yarn wave crimping and shaping method proposed in this invention. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0044] A moisture-wicking polyester low-elasticity yarn, comprising the following formula:

[0045] 85-95 parts of copolymerized hygroscopic modified polyester chips;

[0046] 3-8 parts of toughening compatibility masterbatch;

[0047] Antioxidant and lubricating masterbatch, 2-7 parts;

[0048] This polyester low-elasticity yarn has a rounded rectangular monofilament cross section with two symmetrically arranged axially penetrating crescent-shaped concave grooves inside the cross section. The monofilament has a three-segment wavy irregular crimp configuration with alternating large arc, small arc and transition arc.

[0049] Example 1:

[0050] S1. Raw material drying

[0051] Copolymerized hygroscopic modified polyester chips are selected and placed inside a closed vacuum drying equipment. The vacuum degree is set to 0.08–0.095 MPa and the constant temperature drying temperature is 110–130°C. The drying is carried out continuously at a constant temperature for 8–12 hours, maintaining the equipment in a negative pressure and closed state throughout the process to prevent reverse adsorption of moisture from the outside air. This precisely controls the moisture content of the chips to below 30 ppm. The process thoroughly removes the crystal water and adsorbed water inside the chips, avoiding the generation of bubbles in the water-containing melt during extrusion, as well as problems such as filament drift, filament breakage, and uneven yarn during spinning. It also stabilizes the shear rheological viscosity of the polyester melt, ensuring uniform physical properties during subsequent melt mixing, extrusion, and conveying processes.

[0052] S2, Melt Extrusion

[0053] The dried polyester granules are fed into a screw extruder, where a five-stage gradient temperature control system is used. The temperature in each zone is strictly maintained within the range of 260-290℃. Relying on the low-speed shearing of the screw and the step-by-step heat conduction, the chips are gradually softened, melted, and fully plasticized and mixed from a solid state, eliminating the concentration difference between unmelted particles and the melt. Then, a high-precision metering pump delivers the melt at a constant pressure and flow rate, ensuring minimal fluctuations in the melt delivery pressure and guaranteeing a continuous, stable, and pulsation-free melt output. This avoids deviations in filament thickness and fluctuations in physical properties from the source.

[0054] S4. Spinning Cooling: The melt is extruded using a standard circular spinneret, forming a natural solid circular cross-section nascent filament after extrusion. A fixed lateral constant temperature and humidity cold air cooling system is adopted, strictly locking the cooling wind speed at 0.3~0.5m / s, the wind temperature at 18~25℃, and the ambient humidity at 60%~75%. The cold air exchanges heat in parallel and uniformly along the radial direction of the filament. The nascent filament cools and solidifies naturally and slowly with the temperature, forming only a regular, smooth, solid circular cross-section with no grooves or depressions inside. The cross-sectional structure is simple and has no special shape.

[0055] S5, Stretch and elastic

[0056] After cooling and setting, the nascent filaments with a circular cross-section are smoothly and slowly tractioned and conveyed by multiple sets of parallel guide rollers. A fixed stretch ratio of 1.3 to 1.6 times and an equipment operating speed of 400 to 600 m / min are uniformly set. Through integrated processing of hot stretching and mechanical false twisting, the orientation and arrangement of the fiber macromolecular chains are reshaped, naturally forming a traditional single circular arc crimp structure with equal pitch and equal arc. The crimp density is uniform and the arc is completely consistent, giving the filament only basic elastic shrinkage force and ordinary bulkiness.

[0057] S7, Winding and forming

[0058] After texturing, the yarn is fed into a standard network nozzle to achieve light network node consolidation, which improves the cohesion and adhesion between monofilaments and prevents splitting, scattering, and slippage during subsequent weaving. The entire process adopts constant tension closed-loop control for layered regular winding, forming a standard yarn roll with dense packaging, uniform interlayer arrangement, and flat end face.

[0059] Example 2:

[0060] S1. Raw material drying

[0061] Same as Example 1.

[0062] S2, Melt Extrusion

[0063] Same as Example 1.

[0064] S3, Irregular cross-section pre-type

[0065] Replace with a custom-designed spinneret with a single hole designed as a composite hole shape with an outer square and inner concave shape. When the melt is extruded from the spinneret, it is in a high-temperature molten and highly plastic state, and the molecular chains are not frozen and shaped. At this time, the circumferential zoned side blowing system is activated to divide the air field into three independent temperature and speed control zones: inner ring, middle ring, and outer ring. Different wind speeds and temperature gradients are set for each layer to form a radially circumferential gradual air field.

[0066] The wind field flexibly wraps and limits the filament from 360° around its periphery, and uses the difference in wind speed in different ring layers to generate radial micro-pressure, forcibly constraining the outer contour of the nascent filament to naturally shrink and shape into a rounded rectangle. At the same time, two crescent-shaped concave grooves are symmetrically extruded and formed inside the cross-section, running through the entire fiber axis. The grooves have uniform curvature, consistent depth, smooth inner walls, and no breaks or blockages. The irregular cross-sectional shape is solidified in one go during the plastic stage of the nascent filament, locking in a permanent capillary moisture-conducting channel structure.

[0067] S4, Spinning Cooling

[0068] Using the same wind speed, wind temperature, and humidity cooling parameters as in Example 1, the nascent filaments that have completed the pre-shaped profile are cooled by uniform and slow heat exchange. The temperature of the filaments is gradually reduced, the molecular chain arrangement is solidified, the outer contour of the rounded rectangle and the morphology of the inner crescent groove are stabilized, and internal stress caused by excessive cooling is avoided, which leads to cross-sectional shrinkage, groove collapse and closure, and the irregular capillary channel structure is permanently locked.

[0069] S5, Stretch and elastic

[0070] The stretching ratio, running speed, heat setting temperature, and false twisting process are kept consistent with those in Example 1. Only conventional macromolecular orientation stretching and basic false twisting are performed, without changing the filament curling shape, and the traditional single uniform arc curling structure is still retained.

[0071] S7, Winding and forming

[0072] Same as Example 1.

[0073] Example 3:

[0074] S1. Raw material drying

[0075] Same as Example 1.

[0076] S2, Melt Extrusion

[0077] Same as Example 1.

[0078] S4, Spinning Cooling

[0079] Same as Example 1.

[0080] S5, Stretch and elastic

[0081] Same as Example 1.

[0082] S6, Wave Curl Shaping

[0083] It adopts an integrated biomimetic wave guide rail, and the guide rail trajectory is designed as a continuous smooth curve with alternating large arc segments, small arc segments, and transition arc segments, without right-angle inflection points or abrupt bends;

[0084] The system is equipped with a multi-segmented gradient heat setting temperature field, which is divided into a preheating zone, a setting zone, and a slow cooling zone along the direction of the yarn travel. Each zone has a precise temperature control to create a progressive thermal environment. After the yarn is stretched and false twisted, it still retains thermoplasticity and slides along the biomimetic wave guide rail. Under the action of the gradient temperature field, the molecular chains slowly relax and rearrange, and are permanently shaped into a three-segment wave-shaped curl with a large arc-small arc-transition arc cycle according to the preset pitch, arc length, and undulation height. This fixes the curl cycle rhythm and three-dimensional undulation amplitude, completely breaking the traditional dense winding state of yarn and reshaping the macroscopic spatial arrangement of yarn.

[0085] S7, Winding and forming

[0086] Same as Example 1.

[0087] Example 4

[0088] S1. Raw material drying

[0089] Same as Example 1.

[0090] S2, Melt Extrusion

[0091] Same as Example 1.

[0092] S3, Irregular cross-section pre-type

[0093] Replace with a custom-designed spinneret with a single hole designed as a composite hole shape with an outer square and inner concave shape. When the melt is extruded from the spinneret, it is in a high-temperature molten and highly plastic state, and the molecular chains are not frozen and shaped. At this time, the circumferential zoned side blowing system is activated to divide the air field into three independent temperature and speed control zones: inner ring, middle ring, and outer ring. Different wind speeds and temperature gradients are set for each layer to form a radially circumferential gradual air field.

[0094] The wind field flexibly wraps and limits the filament from 360° around its periphery, and uses the difference in wind speed in different ring layers to generate radial micro-pressure, forcibly constraining the outer contour of the nascent filament to naturally shrink and shape into a rounded rectangle. At the same time, two crescent-shaped concave grooves are symmetrically extruded and formed inside the cross-section, running through the entire fiber axis. The grooves have uniform curvature, consistent depth, smooth inner walls, and no breaks or blockages. The irregular cross-sectional shape is solidified in one go during the plastic stage of the nascent filament, locking in a permanent capillary moisture-conducting channel structure.

[0095] S4, Spinning Cooling

[0096] Using the same wind speed, wind temperature, and humidity cooling parameters as in Example 1, the nascent filaments that have completed the pre-shaped profile are cooled by uniform and slow heat exchange. The temperature of the filaments is gradually reduced, the molecular chain arrangement is solidified, the outer contour of the rounded rectangle and the morphology of the inner crescent groove are stabilized, and internal stress caused by excessive cooling is avoided, which leads to cross-sectional shrinkage, groove collapse and closure, and the irregular capillary channel structure is permanently locked.

[0097] S5, Stretch and elastic

[0098] The stretching ratio, running speed, heat setting temperature, and false twisting process are kept consistent with those in Example 1. Only conventional macromolecular orientation stretching and basic false twisting are performed, without changing the filament curling shape, and the traditional single uniform arc curling structure is still retained.

[0099] S6, Wave Curl Shaping

[0100] It adopts an integrated biomimetic wave guide rail, and the guide rail trajectory is designed as a continuous smooth curve with alternating large arc segments, small arc segments, and transition arc segments, without right-angle inflection points or abrupt bends;

[0101] The system is equipped with a multi-segmented gradient heat setting temperature field, which is divided into a preheating zone, a setting zone, and a slow cooling zone along the direction of the yarn travel. Each zone has a precise temperature control to create a progressive thermal environment. After the yarn is stretched and false twisted, it still retains thermoplasticity and slides along the biomimetic wave guide rail. Under the action of the gradient temperature field, the molecular chains slowly relax and rearrange, and are permanently shaped into a three-segment wave-shaped curl with a large arc-small arc-transition arc cycle according to the preset pitch, arc length, and undulation height. This fixes the curl cycle rhythm and three-dimensional undulation amplitude, completely breaking the traditional dense winding state of yarn and reshaping the macroscopic spatial arrangement of yarn.

[0102] S7, Winding and forming

[0103] Same as Example 1.

[0104] It should be noted that, in comparison with the various embodiments, Comparative Example 1 uses conventional circular spinneret spinning, and ordinary polyester low-elasticity yarn is obtained through a standard spinning, cooling, stretching and texturing process; Comparative Example 2 uses a conventional circular cross-section spinning process, and the fabric is given moisture-wicking properties through a hydrophilic finishing process. Specific experimental data parameters are shown in Table 1.

[0105] Table 1: Comparison of Comprehensive Properties of Polyester Low-Elasticity Yarn Prepared by Different Processes

[0106] project Fracture strength (cN / dtex) Curl shrinkage rate (%) Instantaneous moisture absorption rate (s) Fabric bulk (cm³ / g) Example 1 2.78 8.10 19.50 4.68 Example 2 2.86 8.30 12.80 4.75 Example 3 2.84 8.70 17.20 5.62 Example 4 2.95 9.20 8.50 5.96 Comparative Example 1 2.65 7.20 28.60 4.12 Comparative Example 2 2.71 7.50 22.30 4.35

[0107] Specifically, Example 1 exhibits a breaking strength of 2.78 cN / dtex, a crimp shrinkage rate of 8.10%, an instantaneous moisture absorption rate of 19.50 s, and a fabric bulk of 4.68 cm³ / g. All four indicators are significantly higher than those of Comparative Example 1 and Comparative Example 2. Comparative Example 1 uses conventional round-section polyester low-elasticity yarn and employs only a traditional general spinning process; Comparative Example 2 relies solely on post-treatment with hydrophilic properties to enhance moisture absorption without optimizing the fiber structure. Example 1 of this invention, relying on proprietary modified polyester raw materials and a standardized spinning process, requires no subsequent chemical modification. Its basic mechanical properties, crimp elasticity, moisture absorption capacity, and bulkiness are all significantly superior to existing traditional processes, demonstrating that the basic process architecture of this invention possesses inherent technological advantages, laying a solid performance foundation for subsequent structural innovation and upgrades.

[0108] Specifically, in Example 2, the breaking strength increased to 2.86 cN / dtex, the crimp shrinkage rate increased to 8.30%, the instantaneous moisture absorption rate was significantly shortened from 19.50s to 12.80s, and the fabric bulkiness slightly increased to 4.75 cm³ / g. This invention adds a pre-forming process for irregular cross-sections, forming a composite cross-section with rounded rectangles and symmetrical crescent-shaped through grooves during the initial plastic stage of the nascent yarn. This relies on the fiber's own physical capillary structure to form natural wicking channels, eliminating the need for hydrophilic auxiliaries and post-treatment modifications. Compared to the ordinary solid circular cross-section in Example 1, while slightly improving mechanical strength and maintaining unaffected weaving performance, the instantaneous moisture absorption response speed is qualitatively improved, fully demonstrating the unique advantage of this invention's irregular cross-section structure in optimizing moisture absorption performance from the microscopic morphology perspective.

[0109] Specifically, in Example 3, the curl shrinkage rate was increased to 8.70%, the fabric bulk was significantly improved to 5.62 cm³ / g, the breaking strength was stably maintained at 2.84 cN / dtex, and the instantaneous moisture absorption rate was also optimized to 17.20 s. This invention, through a wave-curling setting process, reconstructs the filaments into three alternating wave-shaped curls of large arcs, small arcs, and transition arcs, changing the traditional single-arc dense arrangement and effectively increasing the gaps between filaments and the allowance for elastic deformation. Compared to Example 1, the curl resilience and fabric bulk are significantly improved, while the mechanical strength remains unchanged and the basic moisture absorption performance is simultaneously improved, highlighting the unique value of this invention's innovative macroscopic curling morphology in improving the fabric's breathability, bulkiness, and anti-caking properties.

[0110] Specifically, in Example 4, the breaking strength was increased to 2.95 cN / dtex, the crimping shrinkage rate was increased to 9.20%, the instantaneous moisture absorption rate was further shortened to 8.50 s, and the fabric bulkiness was increased to 5.96 cm³ / g. All four indicators reached the optimal level of each group of samples. This invention also introduces a pre-forming process for irregular cross-sections and a wave crimping process, simultaneously completing structural reconstruction at both the microscopic cross-sectional structure and macroscopic crimping spatial structure of the fibers. Among them, the axially penetrating crescent grooves can form a continuous liquid transport path inside the monofilament, while the three-segment wave crimping structure forms an alternating distribution space between the filament bundles, allowing the liquid to continue to diffuse and transfer to the surrounding area after completing the monofilament transfer, avoiding the liquid from accumulating in a local area; at the same time, the irregular support structure formed by the wave crimping can reduce the degree of filament compression and adhesion, maintaining the internal porosity of the fabric.

[0111] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A moisture-wicking and perspiration-absorbing polyester low-elasticity yarn, characterized in that, Includes the following formula: 85-95 parts of copolymerized hygroscopic modified polyester chips; 3-8 parts of toughening compatibility masterbatch; Antioxidant and lubricating masterbatch, 2-7 parts; This polyester low-elasticity yarn has a rounded rectangular monofilament cross section with two symmetrically arranged axially penetrating crescent-shaped concave grooves inside the cross section. The monofilament has a three-segment wavy irregular crimp configuration with alternating large arc, small arc and transition arc.

2. The method for preparing a moisture-wicking, perspiration-absorbing polyester low-elasticity yarn according to claim 1, characterized in that, Includes the following steps: S1. Raw material drying The copolymerized moisture-absorbing modified polyester chips, toughening compatibility masterbatch, and antioxidant lubricating masterbatch, weighed and mixed according to the formula, are fed into a vacuum drying equipment for closed constant temperature drying treatment. The vacuum isolates the intrusion of external environmental moisture, so that the moisture content of the raw materials is reduced to the acceptable range for spinning, ensuring the stability of the rheological properties of the subsequent melt and avoiding problems such as bubbles, broken fibers and uneven fiber properties during the spinning process. S2, Melt Extrusion The dried and qualified mixed raw materials are fed into the screw extruder. The multi-stage zone gradient heating mode is used to gradually melt and plasticize the raw materials. The screw shears and mixes to achieve uniform compatibility of the melt components. Then, the melt is delivered quantitatively at constant pressure and constant flow through the metering pump to ensure a continuous and stable supply of melt. S3, Irregular cross-section pre-type The melt is extruded through a special custom-shaped spinneret to form a high-temperature nascent filament. The nascent filament is in a high-temperature, plastic, and uncured state. A radial temperature and wind speed gradient field is formed by circumferential side blowing to limit and constrain the outer contour and internal groove morphology of the nascent filament. A rounded rectangular composite cross-section structure with symmetrical crescent-shaped concave grooves is formed in one step. S4, Spinning Cooling The extruded nascent fibers with irregular cross sections are slowly cooled by a side-enclosed constant temperature and humidity cold air system, so that the fibers are gradually and uniformly solidified from the surface to the core, stabilizing the formed cross section profile and groove structure, and preventing internal stress distortion and groove closure failure caused by rapid cooling. S5, Stretch and elastic After cooling and solidification, the nascent fibers are smoothly pulled and conveyed by multiple sets of guide rollers. Under the conditions of set stretch ratio and equipment operating speed, hot stretching and mechanical false twist texturing composite processing are completed simultaneously to adjust the orientation regularity of fiber macromolecular chains and construct the basic crimp skeleton and elastic base of the filament. S6, Wave Curl Shaping After the stretching and texturing process and before the final winding, the yarn is continuously bent and shaped by a special biomimetic guide yarn path combined with a segmented heat setting temperature field, so that the yarn naturally forms a wave-like curling shape with large arc segments, small arc segments, and smooth transition arc segments in successive cycles, fixing the overall curling undulation pattern. S7, Winding The wavy, crimped yarn is introduced into a network nozzle for light network weaving to improve the cohesion between monofilaments. Then, it is continuously and regularly wound with constant winding tension to obtain a finished yarn roll with uniform interlayer arrangement and dense roll structure, which is convenient for subsequent weaving and dyeing and finishing.

3. The method for preparing moisture-wicking polyester low-elasticity yarn according to claim 2, characterized in that, The vacuum drying process in S1 employs a negative pressure and constant temperature condition, limiting the vacuum level, drying temperature, and drying time to precisely control the moisture content of the mixed raw materials to below 30 ppm, thus avoiding uneven melt plasticization and spinning defects caused by the moisture content of the raw materials from the source.

4. The method for preparing moisture-wicking polyester low-elasticity yarn according to claim 2, characterized in that, The S2 screw extruder is equipped with multiple independent temperature control zones. Each zone is heated and melted in stages according to the temperature gradient. The screw shearing action is used to achieve full compatibility and mixing of multi-component masterbatch and polyester chips.

5. The method for preparing moisture-wicking polyester low-elasticity yarn according to claim 2, characterized in that, The S4's side cooling system employs a closed side-blowing structure. By precisely controlling the cooling airflow speed, temperature, and ambient humidity, it creates a uniform and slow cooling condition, ensuring that the irregular cross-section and internal groove structure remain intact and do not collapse.

6. The method for preparing moisture-wicking polyester low-elasticity yarn according to claim 2, characterized in that, The S5 uses an integrated synchronous processing method of hot stretching and mechanical false twisting. By matching the fixed stretching ratio with the production line speed, the orientation of fiber macromolecules is reconstructed, giving the filament basic resilience and fluffiness.

7. The moisture-wicking polyester low-elasticity yarn according to claim 1, characterized in that, The two crescent-shaped concave grooves inside the monofilament are integrally formed into a continuous structure, running through the entire fiber axis without any breaks. This allows for the spontaneous formation of capillary water transport channels, enabling rapid wicking and conduction of sweat.

8. The moisture-wicking polyester low-elasticity yarn according to claim 1, characterized in that, The monofilament three-segment wave crimping is a non-uniform arc alternating arrangement structure. By relying on the staggered arrangement of arc segments, the space gap between monofilaments is increased, which improves the fabric's breathability, moisture dissipation, and compression resistance and resilience.

9. The method for preparing moisture-wicking polyester low-elasticity yarn according to claim 2, characterized in that, The S7 uses a light, low-elasticity network node processing method, which only moderately enhances the cohesion of the single filaments to prevent them from falling apart, without damaging the original irregular cross-section and wavy curl structure of the filaments, and maintains constant tension throughout the winding process.

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