Preparation method of directional moisture-conducting cool-feeling yarn

Abstract

The invention provides a preparation method of directional moisture-conducting cool-feeling yarns, which comprises the following steps: S10, hydrophobic fibers and hydrophilic fibers are selected as raw materials, the average length of the selected hydrophobic fibers is smaller than that of the hydrophilic fibers, and the average linear density of the selected hydrophobic fibers is larger than that of the hydrophilic fibers; s20, hydrophobic fibers and hydrophilic fibers are mixed into a single fiber aggregate; and S30, feeding the fiber aggregate into a single-channel drafting mechanism of a spinning frame, setting the roller gauge of a main drafting area of the drafting mechanism to be greater than the average length of the hydrophilic fibers, drafting the fiber aggregate under the roller gauge, and twisting the drafted fiber strands into yarns. The preparation method is simple in technological process, and the prepared directional moisture-conducting cool-feeling yarn is long in function duration time and not prone to weakening after being washed.

Description

Technical Field

[0001] This invention relates to the field of cooling yarn technology, specifically to a method for preparing a directional moisture-wicking cooling yarn. Background Technology

[0002] Currently, cool-feeling yarns with directional moisture-wicking properties are generally achieved through chemical finishing or filament core-spun yarn technology. Existing processes suffer from weakened functionality after washing and complex manufacturing procedures. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a method for preparing a moisture-wicking and cool-feeling yarn. This method has a simple process flow, and the prepared moisture-wicking and cool-feeling yarn has a long-lasting function and is not easily weakened after washing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: Technical Solution 1: A method for preparing a moisture-wicking and cool-feeling yarn, comprising the following steps: S10: Selecting hydrophobic fibers and hydrophilic fibers as raw materials, wherein the average length of the selected hydrophobic fibers is less than the average length of the selected hydrophilic fibers, and the average linear density of the selected hydrophobic fibers is greater than the average linear density of the selected hydrophilic fibers; S20: Mixing the hydrophobic fibers and the hydrophilic fibers into a single fiber aggregate; S30: Feeding the fiber aggregate into a single-channel drafting mechanism of a spinning machine, setting the roller spacing of the main drafting zone of the drafting mechanism to be greater than the average length of the hydrophilic fibers, drafting the fiber aggregate at the roller spacing, and twisting the drafted sliver into yarn.

[0005] Technical Solution 2 based on Technical Solution 1: Step S30 further includes: reducing the gripping pressure of the front zone roller on the fiber assembly in the drafting mechanism to 120 Newtons / double spindle to 145 Newtons / double spindle.

[0006] Technical Solution 3 based on Technical Solution 1: In step S10, the hydrophobic fiber is a jade-polyester composite moisture-wicking fiber with an irregular cross section; the hydrophilic fiber is bamboo fiber or Tencel fiber.

[0007] Technical Solution 4 based on Technical Solution 3: The cross-sectional shape of the hydrophobic fiber is honeycomb microporous, triangular, cross-shaped or wavy.

[0008] Technical solution five based on technical solution four: the cross-sectional irregularity of the hydrophobic fiber is more than 15%.

[0009] Technical Solution Six based on Technical Solution One: The lengths of both the hydrophobic fiber and the hydrophilic fiber are selected from one of the following ranges: 32 mm to 38 mm, 51 mm to 76 mm, and 70 mm to 150 mm.

[0010] Technical solution seven based on technical solution one: In step S20, the mass percentage of the hydrophobic fiber is 10% to 90%, and the mass percentage of the hydrophilic fiber is 90% to 10%.

[0011] Technical solution eight based on technical solution one: Step S20 includes: mixing the hydrophobic fiber and the hydrophilic fiber in the form of loose fibers in the cotton opening and cleaning process.

[0012] Technical solution nine based on technical solution one: Step S20 includes: making the hydrophobic fiber and the hydrophilic fiber into fiber strips respectively, and then performing two to three folding processes on the fiber strips in the drawing process.

[0013] Technical solution ten based on technical solution one: In step S30, the twist parameter of the spinning machine is set to control the twist coefficient of the spun yarn to be 260 to 420. As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects: Technical Solution 1 provides a method for preparing a directional moisture-wicking and cooling yarn. This method has a simple process flow, and the resulting directional moisture-wicking and cooling yarn has a long-lasting function that is not easily weakened after washing. In conventional spinning processes, to ensure yarn evenness, it is usually required that the fibers of each component in the blend be as consistent as possible in length and linear density to avoid draft waves or accidental breakage due to excessive differences in fiber movement. If radial layering of the yarn is required, conventional techniques often rely on physical forcing methods, such as introducing continuous filaments as the core layer skeleton or using a dual-channel isolation feeding device. However, the addition of continuous filaments limits the yarn's bulkiness and softness, while the modification of dual-channel equipment increases production costs and process difficulty. If different hydrophilic and hydrophobic fibers are simply mixed under conventional processes, due to the lack of driving force for directional migration, hydrophilic fibers will inevitably be exposed on the yarn surface, causing sweat to remain on the skin and failing to achieve unidirectional moisture-wicking function.

[0014] This solution selects hydrophobic fibers with an average length shorter than hydrophilic fibers and an average linear density greater than hydrophilic fibers. Combined with a specific process constraint where the roller spacing in the main drafting zone is greater than the average length of the hydrophilic fibers, during drafting and twisting, the longer and finer hydrophilic fibers, due to their length advantage, bear the main spinning tension in the twisting triangle zone, tending to be squeezed towards the yarn's central axis to shorten their path. Simultaneously, their finer linear density gives them lower bending stiffness, making them easier to tightly wind around the yarn core. Conversely, the shorter hydrophobic fibers, due to the roller spacing being greater than their length and also greater than the length of the longer fibers, are in a relatively loose distribution state within the drafting zone, experiencing weaker tension control. At the same time, their higher linear density gives them higher bending stiffness, making them difficult to bend into the yarn's center. Thus, through the synergistic combination of materials and processes, the hydrophobic fibers are squeezed to the outer layer of the yarn at the moment of yarn formation, while the hydrophilic fibers spontaneously aggregate in the inner layer. This solution achieves spontaneous structural layering of all short fiber yarns without requiring a continuous filament core layer or special dual-channel equipment. It constructs a wetting gradient with a loose outer layer and a pore gradient with a coarse outer layer and a fine inner layer, which not only ensures the dryness and coolness of the yarn surface, but also utilizes the differential capillary effect of the core layer to achieve rapid directional moisture removal, while retaining the unique soft and fluffy hand feel of short fiber yarns.

[0015] Technical solution two reduces the gripping pressure of the front zone rollers to 120-145 Newtons per spindle, thereby reducing the frictional constraint on the fiber assembly within the drafting zone. This relatively relaxed mechanical gripping environment, combined with the large roller spacing, further reduces restrictions on the movement of short fibers, making them easier to slide outwards under twisting torque and centrifugal force. Simultaneously, the reduced pressure prevents longer hydrophilic fibers from breaking due to excessive stress, thus ensuring the continuity and integrity of long fibers within the yarn core.

[0016] Technical Solution 3 uses irregularly shaped cross-section jade-polyester composite moisture-wicking fiber as the hydrophobic layer and bamboo fiber or Tencel fiber as the hydrophilic layer. The high thermal conductivity of jade powder gives the yarn surface an immediate cooling sensation upon contact, while the high moisture absorption capacity of bamboo fiber or Tencel fiber ensures the effective containment and diffusion of liquid water in the core layer. In this way, after the yarn achieves unidirectional moisture transfer through its structure, it can maintain a continuous cooling sensation by utilizing the moisture absorption and heat release and evaporation heat absorption cycles of the core layer material, solving the problem that the cooling sensation of a single material is not sustainable.

[0017] Technical Solution 4 sets the cross-section of the hydrophobic fiber to a honeycomb-like microporous shape, triangle, cross shape, or wavy shape. This irregular structure increases the specific surface area of ​​the fiber and creates continuous grooves along the fiber axis. The capillary pressure generated by these microgrooves assists liquid water in penetrating the hydrophobic layer and entering the hydrophilic core layer, accelerating the initial absorption rate of sweat. Simultaneously, compared to a circular cross-section, the irregular cross-section increases the porosity between fibers, improving the evaporation efficiency of moisture on the yarn surface.

[0018] Technical Solution 5 limits the cross-sectional anisotropy of the hydrophobic fibers to over 15%, ensuring that the grooves on the fiber surface have sufficient depth to generate effective moisture-wicking capillary pressure. Furthermore, the higher anisotropy increases the fiber's bending stiffness at the same linear density, further amplifying the stiffness difference between hydrophobic and hydrophilic fibers. This strengthens the tendency of the hydrophobic fibers to migrate to the outer layer during twisting, thereby improving the stability and coverage of the outer hydrophobic structure.

[0019] Technical Solution Six limits the fiber length to a range of 32 mm to 38 mm, 51 mm to 76 mm, or 70 mm to 150 mm, ensuring that the raw material specifications match the equipment parameters of cotton-type, medium-length, or wool-type spinning systems. By selecting hydrophobic and hydrophilic fibers within the aforementioned different ranges, it is possible to construct raw material combinations that meet the length variation requirements, ensuring the feasibility of industrial production.

[0020] Technical solution seven controls the mass percentage of hydrophobic fibers and hydrophilic fibers to the range of 10% to 90% and 90% to 10%, respectively. A higher proportion of hydrophobic fibers can form a denser one-way moisture-wicking barrier layer, which is suitable for scenarios with high perspiration. A higher proportion of hydrophilic fibers can provide a larger moisture storage space, which is suitable for scenarios with higher requirements for moisture absorption and breathability.

[0021] Technical solution eight adopts a method of mixing loose fibers in the opening and cleaning process, which simplifies the mixing process, reduces the number of subsequent drawing passes, improves production efficiency and reduces preparation costs while ensuring the overall stability of the fiber component ratio.

[0022] Technical solution nine employs a method of combining fiber slivers in two to three stages during the drawing process, which provides better control over the blending ratio compared to loose fiber mixing. During the combining process, roller drafting improves the straightening and parallelism of the fibers, reduces disordered fiber entanglement, and allows fibers of different lengths and fineness to migrate radially better in the subsequent spinning process, resulting in yarns with a more regular structure and more uniform yarn evenness.

[0023] Technical Solution 10 controls the yarn twist coefficient between 260 and 420. The lower twist reduces the centripetal pressure between fibers, preserving the capillary channels inside the yarn for moisture transfer and preventing excessive twist from closing the pores and hindering moisture-wicking performance. At the same time, the lower twisting tension generated by the lower twist helps short and thick fibers maintain their distribution on the outer layer, preventing them from being excessively wound into the yarn core, thereby further improving the yarn's softness and layering effect. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. 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.

[0025] In the claims and description of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0026] Example This invention relates to a method for preparing a moisture-wicking and cool-feeling yarn, which mainly includes the following steps: S10: Select hydrophobic fibers and hydrophilic fibers as raw materials, wherein the average length of the selected hydrophobic fibers is less than the average length of the selected hydrophilic fibers, and the average linear density of the selected hydrophobic fibers is greater than the average linear density of the selected hydrophilic fibers. S20: The hydrophobic fibers and the hydrophilic fibers are mixed into a single fiber aggregate; S30: The fiber assembly is fed into the single-channel drafting mechanism of the spinning machine, the roller spacing of the main drafting zone of the drafting mechanism is set to be greater than the average length of the hydrophilic fiber, the fiber assembly is drafted at the roller spacing, and the drafted sliver is twisted into yarn.

[0027] The following provides a detailed explanation of each step.

[0028] First, step S10 will be explained in detail.

[0029] In step S10, the raw materials are first selected and prepared. Hydrophobic fibers are used as the base material for constructing the outer layer of the yarn. These hydrophobic fibers are preferably modified polyester fibers, with submicron or nano-sized inorganic mineral powders, such as silica, magnesium oxide, calcium oxide, or jade powder, added to their matrix. The high thermal conductivity of the mineral powders imparts a cooling sensation to the fiber. Simultaneously, to enhance moisture-wicking performance, the cross-sectional shape of the hydrophobic fiber is set to a non-circular irregular structure. Specific shapes can be selected from honeycomb microporous, triangular, cross-shaped, or wavy shapes, and the cross-sectional irregularity of the fiber is required to reach at least 15%. The longitudinal grooves formed on the fiber surface generate a capillary effect, assisting in moisture conduction and increasing the heat dissipation surface area. Hydrophilic fibers are selected as the base material for constructing the core layer of the yarn. These hydrophilic fibers are selected from regenerated cellulose fibers with high moisture absorption capacity, specifically including bamboo pulp fiber, lyocell fiber, modal fiber, or viscose fiber. Their excellent water absorption and swelling properties provide continuous moisture pumping power for the yarn.

[0030] Based on the selected materials, the physical morphological parameters of the two types of fibers must be strictly limited to meet the requirements. Regarding fiber length, the average length of the selected hydrophobic fibers must be strictly less than the average length of the hydrophilic fibers. In specific implementations, if a cotton-type spinning system is used, the length of the hydrophobic fibers should be selected from 32 mm to 38 mm, while the length of the hydrophilic fibers should be selected from 51 mm to 76 mm. The length difference between the two should preferably be controlled at more than 10 mm to ensure a significant tension difference during subsequent drafting. If a wool-type or medium-length spinning system is used, the length of the hydrophobic fibers should be selected from 70 mm to 100 mm, and the length of the hydrophilic fibers should be selected from 110 mm to 150 mm, always maintaining a gradation relationship where the hydrophilic fibers are significantly longer than the hydrophobic fibers.

[0031] Regarding fiber linear density, the average linear density of the selected hydrophobic fibers must be greater than that of the hydrophilic fibers. Specifically, the hydrophobic fibers are relatively coarse and have higher bending stiffness, while the hydrophilic fibers are relatively fine and flexible. Specifically, the linear density of a single hydrophobic fiber is set between 1.5 and 2.2 dB, and the linear density of a single hydrophilic fiber is set between 1.0 and 1.3 dB, with the difference preferably maintained above 0.3 dB. This combination of short and long fibers, utilizing the characteristics of coarse fibers being less prone to bending and core formation and short fibers having weaker controllability, presupposes a physical tendency for the hydrophobic fibers to migrate outwards. Simultaneously, utilizing the characteristics of fine fibers being easy to entangle and long fibers having inward compression, it establishes the structural basis for the inward aggregation of the hydrophilic fibers. The mass ratio of the two types of fibers is adjusted according to the moisture-wicking and water-storage requirements of the final product, with the mass percentage of hydrophobic fibers controlled between 10% and 90%, and the mass percentage of hydrophilic fibers controlled between 10% and 90%.

[0032] Next, step S20 will be explained in detail.

[0033] Step S20 involves physically mixing the hydrophobic and hydrophilic fibers selected in step S10 according to a predetermined ratio to form a uniformly distributed single fiber aggregate, preparing it for subsequent yarn forming processes. During this mixing process, depending on the different emphases of the final yarn product regarding outer layer insulation performance and inner layer moisture absorption capacity, the mass percentage of hydrophobic fibers is controlled between 10% and 90%, and the mass percentage of hydrophilic fibers is controlled between 90% and 10%. The specific implementation of this mixing process, depending on production conditions and product precision, mainly employs two forms: loose fiber mixing or fiber sliver mixing.

[0034] The first specific mixing method employs a loose fiber mixing process, which involves mixing during the opening and cleaning process. In this method, the weighed hydrophobic and hydrophilic fibers are fed into the opening and cleaning equipment in a loose fiber state. Utilizing the beating action of the opening and cleaning machinery and the airflow, the two types of fibers achieve macroscopic interweaving and mixing while being opened and impurities removed. The mixed fibers then flow through the carding process, are combed into a web, and bundled into slivers, forming a mixed sliver containing both components. This method has a relatively short process flow and is suitable for large-volume production scenarios with relatively wide ratio requirements.

[0035] The second specific mixing method employs a fiber sliver mixing process, which involves mixing during the drawing process. This method first separately prepares pure hydrophobic and pure hydrophilic fiber slivers through opening, cleaning, and carding processes. Then, according to a set mass ratio, corresponding numbers of hydrophobic and hydrophilic fiber slivers are fed together into the drawing frame for merging. To ensure uniform mixing and fiber straightening and parallelism in the yarn, the fiber sliver typically undergoes two to three merging and drafting processes. After multiple merging processes, fibers of different lengths and fineness are evenly distributed and highly oriented, which is beneficial for the orderly migration of long and short fibers during subsequent spinning. Finally, regardless of the mixing method used, the blended fiber aggregate usually needs to be further drafted and twisted into roving during the roving process, serving as the raw material for the fiber aggregate fed into the spinning frame in step S30.

[0036] Next, step S30 will be explained in detail.

[0037] Step S30 mainly involves the spinning process, the core of which lies in stimulating the radial migration behavior of different fibers during single-channel drafting and twisting by setting specific process parameters. First, the fiber assembly prepared in step S20, typically in the form of roving, is fed into the single-channel drafting mechanism of the spinning machine. This drafting mechanism can be a cotton-type or wool-type spinning system, depending on the length range of the raw material. During drafting, the setting of the roller spacing in the main drafting zone is a key control point for achieving fiber stratification. The roller spacing in the main drafting zone must be set greater than the average length of the hydrophilic fibers, typically set to the average length of the hydrophilic fibers plus a distribution margin of 4 to 6 millimeters. This setting ensures that longer hydrophilic fibers can be properly held and drafted within the drafting zone, while shorter hydrophobic fibers are in a relatively uncontrolled distribution state, creating space for subsequent stratification separation.

[0038] To further promote the freeing and outward migration of short fibers, the gripping force of the drafting mechanism needs to be adjusted in step S30. Specifically, the gripping pressure of the front roller of the drafting mechanism on the fiber assembly is reduced, controlled within the range of 120 Newtons per spindle to 145 Newtons per spindle. This pressure value is significantly lower than the standard pressure of conventional spinning processes. The reduced gripping pressure weakens the frictional constraint of the nip on the short, thick, hydrophobic fibers, increasing their degree of freedom of movement within the drafting zone, thus making them more prone to positional slippage under the subsequent twisting torque.

[0039] After drafting, the fiber slivers then enter the twisting and winding process. During this process, the slivers are twisted and wound into yarn. Due to the pre-set differences in length and linear density, as well as the relaxed drafting environment, the fibers of different components exhibit different mechanical behaviors in the twisting triangle. Longer and finer hydrophilic fibers bear the main spinning tension during twisting and tend to overcome frictional resistance by converging towards the yarn's central axis to shorten the path. In contrast, shorter and thicker hydrophobic fibers, being in a distributed state and subjected to less force, are forced to migrate to the outer layer of the yarn under the inward compression of the longer fibers, ultimately forming a hierarchical structure with the inner layer mainly composed of hydrophilic fibers and the outer layer mainly composed of hydrophobic fibers.

[0040] Furthermore, step S30 requires strict control of the yarn twist parameter to preserve the moisture-wicking channels within the yarn and maintain a soft hand feel. Specifically, the twist coefficient of the spun yarn must be controlled between 260 and 420, a range considered low-twist. Lower twist not only reduces the tightness between fibers, preserving capillary pores for moisture conduction, but also reduces the centripetal pressure during twisting. This helps maintain the outer layer of short, thick fibers, preventing them from being excessively wound into the yarn core, thus ensuring the stability and functionality of the final structure of the directional moisture-wicking and cooling yarn.

[0041] The following specific embodiment illustrates the preparation method.

[0042] Honeycomb microporous jade-polyester composite moisture-wicking fiber was selected as the hydrophobic fiber raw material. This fiber has an irregular cross-section with honeycomb micropores, an irregularity of 20%, and contains nano-jade powder. To create a more favorable gradient of length and fineness for layering, this embodiment uses two different lengths of the above-mentioned hydrophobic fiber: a short fiber with a length of 32 mm and a single fiber linear density of 1.67 dtex (1.5D), and a short fiber with a length of 38 mm and a single fiber linear density of 1.67 dtex (1.5D). Bamboo fiber was selected as the hydrophilic fiber raw material, with a length of 51 mm and a single fiber linear density of 1.33 dtex (1.2D). In this formulation, the length of the hydrophilic bamboo fiber (51 mm) is significantly greater than that of the hydrophobic jade polyester (32 mm and 38 mm), and the linear density of the hydrophilic fiber (1.33 dtex) is less than that of the hydrophobic fiber (1.67 dtex), satisfying the physical principle of "long and thin fibers cohesive, short and thick fibers floating outwards". The mass ratio of the raw materials is set as follows: 30% for 32 mm hydrophobic fiber, 40% for 38 mm hydrophobic fiber, and 30% for 51 mm hydrophilic fiber.

[0043] The aforementioned hydrophobic and hydrophilic fibers are separately fed into an opening and cleaning unit for opening and impurity removal. They are then separately carded into a web and bundled into slivers on a carding machine, yielding pure hydrophobic and pure hydrophilic fiber slivers. These are then mixed in the drawing process, with the appropriate number of hydrophobic and hydrophilic slivers fed simultaneously into the drawing frame according to the aforementioned 30:40:30 ratio (70% hydrophobic fibers and 30% hydrophilic fibers). To ensure fiber straightness, parallelism, and uniform mixing, the fiber slivers undergo three drawing processes (first, second, and third) to produce a mixed sliver with a basis weight of 18 g / 5 m. This mixed sliver is then fed into a roving frame and, under a roving twist coefficient of 85, drawn and twisted to produce a roving with a basis weight of 4.0 g / 10 m.

[0044] The aforementioned roving is fed into a single-channel ring spinning frame equipped with a compact spinning device. During drafting, the roller spacing in the main drafting zone is set based on the longest bamboo fiber (51 mm) in the raw material, specifically 56 mm. This value is greater than the average length of the hydrophilic fibers, providing approximately 18 to 24 mm of distribution space for the shorter hydrophobic fibers. Simultaneously, the pressure of the front zone rollers of the drafting mechanism is adjusted and reduced to 135 N / double spindle to weaken the gripping force on the short, coarse fibers. In the twisting stage, the yarn twist coefficient is set to 330, corresponding to a twist of approximately 720 twists / meter for a 40-count yarn. Under the aforementioned wide spacing, low gripping force, and low twisting process environment, the short, coarse, honeycomb-like microporous jade polyester fibers are squeezed to the outer layer under spinning tension, while the long, fine bamboo fibers aggregate inward to form the yarn core, ultimately winding and shaping to produce a yarn with a directional moisture-wicking and cooling feel.

[0045] This invention relates to a method for preparing a directional moisture-wicking and cooling yarn. This method has a simple process flow, and the resulting directional moisture-wicking and cooling yarn has a long-lasting function that is not easily weakened after washing. In conventional spinning processes, to ensure yarn evenness, it is usually required that the fibers of the blended components be as consistent as possible in length and linear density to avoid draft waves or accidental yarn breakage due to excessive differences in fiber movement. To achieve radial layering of the yarn, conventional techniques often rely on physical means, such as introducing continuous filaments as the core layer skeleton or using a dual-channel isolation feeding device. However, the addition of continuous filaments limits the yarn's bulkiness and softness, while the modification of dual-channel equipment increases production costs and process difficulty. If different hydrophilic and hydrophobic fibers are simply mixed under conventional processes, the lack of a driving force for directional migration means that the hydrophilic fibers will inevitably be exposed on the yarn surface, causing sweat to remain on the skin and failing to achieve unidirectional moisture-wicking function.

[0046] This solution selects hydrophobic fibers with an average length shorter than hydrophilic fibers and an average linear density greater than hydrophilic fibers. Combined with a specific process constraint where the roller spacing in the main drafting zone is greater than the average length of the hydrophilic fibers, during drafting and twisting, the longer and finer hydrophilic fibers, due to their length advantage, bear the main spinning tension in the twisting triangle zone, tending to be squeezed towards the yarn's central axis to shorten their path. Simultaneously, their finer linear density gives them lower bending stiffness, making them easier to tightly wind around the yarn core. Conversely, the shorter hydrophobic fibers, due to the roller spacing being greater than their length and also greater than the length of the longer fibers, are in a relatively loose distribution state within the drafting zone, experiencing weaker tension control. At the same time, their higher linear density gives them higher bending stiffness, making them difficult to bend into the yarn's center. Thus, through the synergistic combination of materials and processes, the hydrophobic fibers are squeezed to the outer layer of the yarn at the moment of yarn formation, while the hydrophilic fibers spontaneously aggregate in the inner layer. This solution achieves spontaneous structural layering of all short fiber yarns without requiring a continuous filament core layer or special dual-channel equipment. It constructs a wetting gradient with a loose outer layer and a pore gradient with a coarse outer layer and a fine inner layer, which not only ensures the dryness and coolness of the yarn surface, but also utilizes the differential capillary effect of the core layer to achieve rapid directional moisture removal, while retaining the unique soft and fluffy hand feel of short fiber yarns.

[0047] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A method for preparing a moisture-wicking and cool-feeling yarn, characterized in that, Includes the following steps: S10: Select hydrophobic fibers and hydrophilic fibers as raw materials, wherein the average length of the selected hydrophobic fibers is less than the average length of the selected hydrophilic fibers, and the average linear density of the selected hydrophobic fibers is greater than the average linear density of the selected hydrophilic fibers. S20: The hydrophobic fibers and the hydrophilic fibers are mixed into a single fiber aggregate; S30: The fiber assembly is fed into the single-channel drafting mechanism of the spinning machine, the roller spacing of the main drafting zone of the drafting mechanism is set to be greater than the average length of the hydrophilic fiber, the fiber assembly is drafted at the roller spacing, and the drafted sliver is twisted into yarn.

2. The method for preparing a directional moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, Step S30 further includes: reducing the gripping pressure of the front zone roller on the fiber assembly in the drafting mechanism to 120 Newtons / double spindle to 145 Newtons / double spindle.

3. The method for preparing a moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, In step S10, the hydrophobic fiber is a shaped cross-section jade-polyester composite moisture-wicking fiber; the hydrophilic fiber is bamboo fiber or Tencel fiber.

4. The method for preparing a moisture-wicking and cool-feeling yarn as described in claim 3, characterized in that, The cross-sectional shape of the hydrophobic fiber is honeycomb-like microporous, triangular, cross-shaped, or wavy.

5. The method for preparing a moisture-wicking and cool-feeling yarn as described in claim 4, characterized in that, The cross-sectional irregularity of the hydrophobic fiber is above 15%.

6. The method for preparing a moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, The lengths of both the hydrophobic and hydrophilic fibers are selected from one of the following ranges: 32 mm to 38 mm, 51 mm to 76 mm, and 70 mm to 150 mm.

7. The method for preparing a moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, In step S20, the mass percentage of the hydrophobic fiber is 10% to 90%, and the mass percentage of the hydrophilic fiber is 90% to 10%.

8. The method for preparing a directional moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, Step S20 includes: mixing the hydrophobic fiber and the hydrophilic fiber in the form of loose fibers during the cotton opening and cleaning process.

9. The method for preparing a directional moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, Step S20 includes: making the hydrophobic fiber and the hydrophilic fiber into fiber strips respectively, and then performing two to three folding processes on the fiber strips in the drawing process.

10. The method for preparing a directional moisture-wicking and cool-feeling yarn as described in claim 1, characterized in that, In step S30, the twist parameters of the spinning machine are set to control the twist coefficient of the spun yarn to be between 260 and 420.