A process and equipment for preparing spun yarn

Abstract

This application relates to the field of worsted yarn, specifically disclosing a process and equipment for preparing spun yarn. The process includes the following steps: material selection, pretreatment of wool and Tencel, multiple blending of wool and Tencel, combing, 4-5 carding passes, and roving to obtain wool-Tencel roving, which is then blended with nylon filaments to obtain spun yarn. The fineness of each component is defined, and the nylon filaments are defined as having water-absorbing particles attached to them. The equipment includes a vacuum collection device and a drying device. The yarn prepared in this application possesses good texture, anti-pilling properties, strength, and moisture absorption.

Description

Technical Field

[0001] This application relates to the field of worsted yarns, and more specifically, to a process and equipment for preparing spun yarns. Background Technology

[0002] The spinning method is crucial to yarn quality, and the choice of method depends primarily on fiber characteristics and yarn requirements. Compactly spun yarns are of higher quality, with better luster, a softer hand feel, and more stable performance. The fabrics produced are more durable, lint-free, pill-free, and have less fuzz, offering better wrinkle resistance and less deformation. However, improvements in yarn texture (dryness, coarseness, and fineness) are limited, and the equipment is expensive. Seilofel spinning is simpler and cheaper, producing high-quality yarn. It involves simultaneous twisting in the same direction, resulting in a circular cross-section, neat and straight fibers, a compact yarn structure, less fuzz, better abrasion resistance, less pilling, and a soft, smooth hand feel. However, it is prone to shearing defects during manufacturing. Both spinning methods have their advantages and disadvantages. Merino superfine wool is delicate and soft, moisture-wicking, antibacterial, deodorizing, naturally biodegradable, and environmentally friendly. Furthermore, Merino wool is an active fiber that responds to changes in body temperature, providing warmth in cold weather and comfort in hot weather, making it an ideal material for clothing. Tencel, as the "green fiber of the 21st century," is the most typical environmentally friendly green fiber. Derived from wood pulp, it is a regenerated cellulose fiber, an environmentally friendly and sustainable material. It boasts bright colors, a smooth and soft feel against the skin, excellent drape, and significantly higher strength than viscose. Blending these two fibers not only retains the temperature-regulating and soft comfort of wool but also further reduces itching, making clothing lighter and more comfortable. However, the yarn strength still needs further improvement to meet broader application requirements.

[0003] How to add nylon filaments to increase the strength of the yarn, so that it can meet the needs of applications ranging from base layers, loungewear, and casual wear to high-strength applications such as sportswear and work jackets, and compensate for the shortcomings of both compact spinning and spun yarn, while significantly improving the quality of the yarn and providing it with high strength and moisture absorption to meet customer requirements and enable the yarn to be used in more scenarios, is an issue that needs to be addressed. Summary of the Invention

[0004] To address the challenge of achieving both high strength and antistatic properties in wool-polyester yarns with a high proportion of polyester, this application provides a process and equipment for preparing spun yarn. The term "spun yarn" is coined by the applicant and differs from common spun yarns like Sirofil and compact spinning. It involves feeding double rovings and single filaments and then vacuum-condensing them during spinning, making it suitable for the specific process described in this application.

[0005] In a first aspect, this application provides a process for preparing betulin spun yarn, including the following preparation steps: S0: Material selection: Selecting Merino superfine wool, Tencel and nylon filament as raw materials; S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, 4-5 combing passes, and roving to obtain wool-Tencel roving. S4: The roving obtained from S3 and the nylon filament are mixed to form a fine yarn to obtain a spun yarn.

[0006] By adopting the above technical solutions, Merino superfine wool is delicate and soft, moisture-wicking, antibacterial and deodorizing, naturally biodegradable, and environmentally friendly. Furthermore, Merino wool is an active fiber that responds to changes in body temperature, thus helping to keep warm in cold weather and preventing stuffiness in hot weather, making it an ideal raw material for clothing. Tencel, as the "green fiber of the 21st century," is a typical environmentally friendly green fiber. Derived from wood pulp, it is a regenerated cellulose fiber, an environmentally friendly and sustainable material with bright colors, a smooth and soft feel, good skin-friendliness, excellent drape, and significantly higher strength than viscose fiber. The blend of these two fibers not only retains the temperature-regulating and soft comfort of wool but also further reduces itching, making clothing lighter and more comfortable. Pre-blending wool and Tencel ensures more thorough and uniform mixing of the raw materials, guaranteeing even fiber dispersion, better and more even yarn drying, and less slippage. Using wool, Tencel, and nylon filament as raw materials, due to the smooth natural properties of Tencel, the wool and Tencel are pre-mixed evenly during spinning before spinning. The two rovings are stretched parallel at a certain distance and naturally converge and twist into a ply. After being stretched, the two bundles of rovings can be better twisted with nylon filaments. Then, nylon filaments are added to blend together, which further enhances the strength while ensuring the texture of the yarn.

[0007] In one specific feasible implementation, the spinning process includes vacuum gathering at a vacuum level of (-20) to (-30) bar and a cradle pressure of 2.4 to 2.6 bar.

[0008] By adopting the above technical solution, vacuum gathering reduces the impact of the twisting triangle zone on strength. The fibers on the two bundles of rovings can be better twisted with the nylon filaments to obtain a tighter structure. The resulting yarn has a more neat fiber arrangement, less hairiness, and better strength performance. Under this vacuum level, the free fiber gathering effect is good. By limiting the cradle pressure, it is suitable for the yarn of this application, ensuring the drafting effect and further improving the yarn strength.

[0009] In one specific feasible implementation, the nylon filament is a nylon filament with water-absorbing particles attached. The preparation steps include: adding propylene glycol and aluminum chloride to an aqueous ethanol solution and stirring until uniform to obtain a crosslinking solution; immersing the nylon filament in the crosslinking solution and soaking it; then adding acrylic water-absorbing particles and stirring until uniform; taking out the nylon filament and letting it stand to obtain nylon filament with water-absorbing particles attached.

[0010] By adopting the above technical solution, the absorbent particles have a good water absorption effect and adhere relatively evenly and firmly to the surface of the nylon filament. This results in a tightly spun yarn with both high strength and high moisture absorption, making it more suitable for close-fitting wear and applicable to a wider range of scenarios. By attaching a certain mass of absorbent particles and a crosslinking solution to the nylon filament, the absorbent particles crosslink to form protrusions on the nylon filament surface. The vacuum degree of this vacuum aggregation allows free fibers to better aggregate and adhere to the wet and rough nylon filament surface under this vacuum, strengthening the cohesion between the nylon filament and the Tencel, further improving the strength of the resulting yarn.

[0011] In one specific feasible implementation, the wool has a fineness of 23-26 micrometers and a length of 70-75 mmH, the Tencel has a fineness of 1.4-1.7 dtex, and the nylon filament has a fineness of 22-24 dtex.

[0012] By adopting the above technical solution, the fineness of wool, Tencel, and nylon filaments is appropriately matched. The wool Tencel produced after mixing wool and Tencel has a uniform yarn, few hairs, and the fibers are not easy to slip off. The mixed wool Tencel can be firmly connected to the nylon filaments attached to the water-absorbing particles.

[0013] In one specific feasible implementation, the mass ratio of wool, Tencel, and nylon filaments is (10-12):1:5.

[0014] By adopting the above technical solution and with appropriate quality ratio, the resulting yarn has neat and straight surface fibers, a tight yarn structure, less hairiness, good abrasion resistance, less pilling, a soft and smooth hand feel, is not easy to peel and cause weaving defects, is lightweight and comfortable, and has high strength.

[0015] In one specific implementation, the absorbent particles include hygroscopic particles with average particle sizes of 10-20 μm and 30-45 μm.

[0016] By adopting the above technical solution, the particles have good water absorption effect and are suitable for the yarn of this application. The moisture-absorbing particles with a particle size of 10-20μm can cross-link more tightly on the surface of nylon filament to improve the connection strength. The moisture-absorbing particles with a particle size of 30-45μm can participate in cross-linking in the cross-linking network and adhere more firmly to the surface of nylon filament. Furthermore, the moisture-absorbing particles of different particle sizes work together to improve the surface roughness of nylon filament, making it more firmly attached to the surface of nylon filament with Tencel.

[0017] In one specific feasible implementation, the mass ratio of hygroscopic particles with average particle sizes of 10-20 μm and 30-45 μm is 1:(1.7-2.1).

[0018] By adopting the above technical solution and limiting the addition mass of moisture-absorbing particles of two different particle sizes, the resulting moisture-absorbing particles are firmly and uniformly attached to the surface of nylon filaments, exhibiting high bonding strength and roughness. In the subsequent vacuum aggregation process of blending with Tencel, the Tencel yarn and free fibers can be well adhered and mechanically bonded by the rough moisture-absorbing particles attached to the nylon filaments, further enhancing the cohesion between fibers. The resulting yarn exhibits high strength.

[0019] Secondly, this application provides a device for spinning roving yarn, applied to the above-mentioned roving yarn preparation process, including a spinning device. The spinning device is provided with a roving feeding device, a roving feeding device, a back roller, a middle roller, and a vacuum gathering device in sequence along the roving conveying direction. The front roller and filament enter the vacuum gathering device through the filament feeding device and merge with the roving. The vacuum gathering device includes a guide wheel and a suction pipe.

[0020] By adopting the above technical solution, the equipment is suitable for the preparation process of the above-mentioned compact spinning yarn. It can better mix Tencel roving and nylon filament. At the same time, after vacuum aggregation, the free fibers of Tencel can be further attached to the surface of the Tencel-nylon blended yarn with water-absorbing particles attached to the nylon filament. The resulting yarn has high strength, combines the advantages of Sirofil spinning and compact spinning, retains the temperature control characteristics and soft and comfortable characteristics of wool, reduces itching, and makes the clothing lighter, more comfortable, smooth and strong. Moreover, the integrated equipment also makes the Tencel adhere more tightly to the surface of the nylon filament during the vacuum aggregation process when the water-absorbing particles are attached to the surface of the nylon filament with excess cross-linking solution.

[0021] In one specific feasible implementation, the spinning unit has a drying device located below the front roller along the yarn conveying direction.

[0022] By adopting the above technical solution, under the tight cohesion of Tencel and moist, rough absorbent particles attached to nylon filaments, the cross-linked absorbent particles of different sizes are interwoven with the Tencel strands and free fibers, and then dried and fixed to form a tight structure, with a good connection effect between the two.

[0023] In one specific feasible implementation, the drying temperature of the drying device is 100-150°C.

[0024] By adopting the above technical solution, the drying temperature is suitable, the drying effect is good, and the resulting yarn has good strength performance.

[0025] In summary, this application has the following beneficial effects: 1. Because this application premixes wool and Tencel multiple times, the raw materials are mixed more thoroughly and evenly, ensuring uniform fiber dispersion and better yarn drying.

[0026] 2. Because this application uses a self-made compact spinning equipment, the resulting yarn combines the advantages of both spun yarn and compact spinning, and has the advantages of both gathering and plying yarn spinning methods. The resulting yarn has less hairiness, higher strength, and a smoother surface, which greatly improves the quality and strength of the yarn and meets customer requirements.

[0027] 3. Because this application limits the vacuum level and cradle pressure of vacuum aggregation, and thus limits the nylon filament to absorbent particles attached to the nylon filament, the Tencel can more tightly bind with the nylon filament. This allows for better adhesion of fibers and free fibers on the yarn, improving both yarn strength and density while also enhancing its absorbency, making it suitable for a wider range of applications. The vacuum level and cradle pressure are suitable for the yarn of this application. Further limiting the fineness, particle size, and mass ratio of each component further improves the cohesion effect of each component, resulting in a yarn with better strength performance.

[0028] 4. This application, by adding a drying device below the front roller and limiting the drying temperature in the equipment for spinning yarn, is suitable for the process of directly feeding the water-absorbing particles with cross-linking solution on the surface of the nylon filament directly into the yarn. This allows the nylon filament to be tightly bound to the Tencel and fixed, maintaining a good binding and attachment structure, and further improving the strength of the yarn. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of an embodiment of the present application that includes a drying device.

[0030] Explanation of reference numerals in the attached drawings: 11. Roving feeder; 12. Roving feeder; 21. Filament feeder; 3. Back roller; 4. Middle roller; 5. Guide roller; 6. Suction pipe; 7. Front roller; 8. Drying guide. Detailed Implementation

[0031] To further aid in understanding the technical solution of the present invention, several specific embodiments are provided to describe the technical solution of the present invention in more detail. All described embodiments are only some embodiments of the present invention, not all of them; embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments are further illustrations of the present invention, but the present invention is not limited thereto.

[0032] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0033] Unless otherwise specified, the experimental reagents used in the preparation examples, embodiments, and comparative examples were all from commercially available brands or obtained through conventional preparation processes. All procedures were performed at a temperature of 25°C and a humidity of 65%.

[0034] Preparation Example Preparation Example 1: Preparation of large and small absorbent particles: 200g of acrylic acid and 1000ml of deionized water were mixed and stirred until homogeneous to obtain an acrylic acid solution. 300g of sodium hydroxide and 900g of deionized water were mixed to obtain a sodium hydroxide solution. The prepared acrylic acid solution and sodium hydroxide solution were mixed until homogeneous to obtain a sodium acrylate solution. Nitrogen gas was introduced, and then 80g of sodium bisulfite, 75g of ammonium persulfate, 10g of N,N-methylenebisacrylamide, and 0.1g of ferrous chloride were added. The mixture was stirred at 30°C for 30 minutes and then filtered to obtain a polymer. 150g of cyclohexane, 15ml of deionized water, 4g of sodium sulfite, and 0.1g of ammonium dodecyl sulfate were added and mixed until homogeneous. The mixture was then pulverized, dried, and ground to obtain large and small absorbent particles with average particle sizes of 35μm and 15μm, respectively.

[0035] Preparation Example 2: Water-absorbing particles attached to nylon filaments: A crosslinking solution was prepared by mixing 1000 ml of deionized water, 1000 ml of ethanol, 500 g of aluminum chloride, and 500 g of propylene glycol. Nylon filaments were immersed in the crosslinking solution and soaked for 1 hour. Then, 400 g of large absorbent particles with an average particle size of 35 μm, prepared in Example 1, were added and stirred for 5 minutes. The nylon filaments were then removed and allowed to stand for 5 minutes to obtain absorbent particles attached to the nylon filaments.

[0036] The nylon filaments in this preparation example have a fineness of 22 dtex.

[0037] Preparation Example 3: Water-absorbing particles attached to nylon filaments: A crosslinking solution was prepared by mixing 1000 ml of deionized water, 1000 ml of ethanol, 500 g of aluminum chloride, and 500 g of propylene glycol. Nylon filaments were immersed in the crosslinking solution and soaked for 1 hour. Then, 400 g of small absorbent particles with an average particle size of 15 μm, prepared in Example 1, were added and stirred for 5 minutes. The nylon filaments were then removed and allowed to stand for 5 minutes to obtain absorbent particles attached to the nylon filaments.

[0038] The nylon filaments in this preparation example have a fineness of 22 dtex.

[0039] Preparation Example 4: Water-absorbing particles attached to nylon filaments: A crosslinking solution was prepared by mixing 1000 ml of deionized water, 1000 ml of ethanol, 500 g of aluminum chloride, and 500 g of propylene glycol. Nylon filaments were immersed in the crosslinking solution and soaked for 1 hour. Then, 200 g of large absorbent particles with an average particle size of 35 μm and 200 g of small absorbent particles with an average particle size of 15 μm prepared in Preparation Example 1 were added. The mixture was stirred for 5 minutes, and the nylon filaments were removed and allowed to stand for 5 minutes to obtain absorbent particles attached to the nylon filaments.

[0040] The nylon filaments in this preparation example have a fineness of 22 dtex.

[0041] Preparation Example 5: Water-absorbing particles attached to nylon filaments: A crosslinking solution was prepared by mixing 1000 ml of deionized water, 1000 ml of ethanol, 500 g of aluminum chloride, and 500 g of propylene glycol. Nylon filaments were immersed in the crosslinking solution and soaked for 1 hour. Then, 267 g of large absorbent particles with an average particle size of 35 μm and 133 g of small absorbent particles with an average particle size of 15 μm prepared in Preparation Example 1 were added. The mixture was stirred for 5 minutes, and the nylon filaments were removed and allowed to stand for 5 minutes to obtain absorbent particles attached to the nylon filaments.

[0042] The nylon filaments in this preparation example have a fineness of 22 dtex.

[0043] Preparation Example 6: Water-absorbing particles attached to nylon filaments: A crosslinking solution was prepared by mixing 1000 ml of deionized water, 1000 ml of ethanol, 500 g of aluminum chloride, and 500 g of propylene glycol. Nylon filaments were immersed in the crosslinking solution and soaked for 1 hour. Then, 267 g of large absorbent particles with an average particle size of 35 μm and 133 g of small absorbent particles with an average particle size of 15 μm prepared in Preparation Example 1 were added. The mixture was stirred for 5 minutes, and the nylon filaments were removed and allowed to stand for 5 minutes to obtain absorbent particles attached to the nylon filaments.

[0044] The nylon filaments in this preparation example have a fineness of 26 dtex.

[0045] Preparation Example 7: Preparation of Tencel Roving: S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 6 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, 4-5 combing passes, and roving to obtain wool-Tencel roving. Example

[0046] Example 1 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, Tencel with a fineness of 1.4 dtex and nylon filament with a fineness of 22 dtex are selected as raw materials in a mass ratio of 10:1:5; S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: Mix one roving of Tencel and one nylon filament obtained in S3 and spin them through a Sirofil spinning machine with a rocker pressure of 2.4 bar to obtain yarn.

[0047] Example 2 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, Tencel with a fineness of 1.4 dtex and nylon filament with a fineness of 22 dtex are selected as raw materials in a mass ratio of 10:1:5; S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a spun yarn under a vacuum of -20 bar and a rocker pressure of 2.4 bar to obtain the yarn.

[0048] Example 3 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 2 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a tight spinning process. The vacuum degree is -20 bar and the rocker pressure is 2.4 bar. Then, the yarn is dried at 120°C to obtain the yarn.

[0049] Example 4 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 3 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a tight spinning process. The vacuum degree is -20 bar and the rocker pressure is 2.4 bar. Then, the yarn is dried at 120°C to obtain the yarn.

[0050] Example 5 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 4 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a tight spinning process. The vacuum degree is -20 bar and the rocker pressure is 2.4 bar. Then, the yarn is dried at 120°C to obtain the yarn.

[0051] Example 6 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 5 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a tight spinning process. The vacuum degree is -20 bar and the rocker pressure is 2.4 bar. Then, the yarn is dried at 120°C to obtain the yarn.

[0052] Example 7 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, with a mass ratio of 10:1:5, Tencel with a fineness of 1.4 dtex, and the water-absorbing particle-attached nylon filaments from Preparation Example 6 were selected as raw materials. S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two rovings of Tencel and one nylon filament obtained in S3 are mixed and spun through a tight spinning process. The vacuum degree is -20 bar and the rocker pressure is 2.4 bar. Then, the yarn is dried at 120°C to obtain the yarn.

[0053] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail. Example 8 This embodiment discloses a shell spinning equipment, referring to... Figure 1 The device includes a spinning unit, which is arranged in sequence along the roving conveying direction as a roving feeding device, a rear roller, a middle roller, and a vacuum gathering device. The front roller and filament enter the vacuum gathering device through the filament feeding device and merge with the roving. The vacuum gathering device includes a guide wheel and a suction pipe.

[0054] The roving prepared in Example 7 was fed into two roving feeding devices and passed through rollers, middle rollers, and vacuum gathering devices in sequence. Nylon filaments were fed into the filament feeding device and twisted with the roving at the vacuum gathering device. Negative pressure was provided by the guide roller and the suction pipe on the other side to better gather the roving and nylon filaments. After twisting, the yarn was obtained by passing through the front roller.

[0055] Example 9 The only difference between this embodiment and embodiment 8 is that there is a drying device below the front roller to dry the gathered roving and filaments and fix the yarn shape.

[0056] Comparative Example Comparative Example 1 S0: Material selection: Merino superfine wool with a fineness of 23 mic and a length of 70 mmH, and Tencel with a fineness of 1.4 dtex are selected as raw materials with a mass ratio of 10:1; S1: Wool is blended and combed to obtain pretreated wool, and Tencel is blended, combed and opened to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is first blended with half the mass of pretreated Tencel to obtain a first blended strip. The blended strip is then blended with the remaining Tencel to obtain a second blended strip. The second blended strip is then blended to obtain a wool-Tencel blended strip. S3: The wool-Tencel blend sliver obtained in S2 is first combed and then combed again, followed by fine combing, four combings, and roving to obtain wool-Tencel roving. S4: The two Tencel rovings obtained in S3 are spun through a Sirospinning machine with a cradle pressure of 2.4 bar to obtain yarn.

[0057] Performance testing test 1: Referring to standard GB / T 3916-2013, the breaking strength of the yarns prepared in each embodiment and comparative example was tested using test method A. The test results are shown in Table 1.

[0058] Test 2: The yarns obtained from each embodiment and preparation example were woven into fabrics, and then the water absorption rate of the yarns obtained from each embodiment and comparative example was tested according to standard GB / T21655.1-2008. The test results are shown in Table 1.

[0059] Test 3: The yarns obtained from each embodiment and preparation example were woven into fabrics, and then the anti-pilling grade of the yarns obtained from each embodiment and comparative example was tested according to standard GB / T4802.1-1997. Grade 5 was slightly fuzzy with no pilling, Grade 4 was slightly fuzzy with slight pilling, Grade 3 was moderate pilling, Grade 2 was slightly severe pilling, and Grade 1 was severe pilling. The test results are shown in Table 1.

[0060] Table 1 Example 1 9.3 181 2 Example 2 16.0 194 4 Example 3 16.7 237 5 Example 4 16.5 229 5 Example 5 18.1 231 5 Example 6 18.6 246 5 Example 7 18.3 240 5 Comparative Example 1 9.3 209 1 As can be seen from Examples 1-2 and Comparative Example 1 and Table 1, the yarn produced by this application has high strength and anti-pilling grade by pre-mixing wool and Tencel multiple times and spinning two wool Tencel and one nylon filament by spun tightly using self-made equipment.

[0061] As can be seen from Examples 2-7 and Table 1, this application further enhances the cohesion effect of each component by limiting the nylon filament to water-absorbing particles attached to the nylon filament, the fineness, particle size and mass ratio of each component, and the resulting yarn has both water absorption rate and better breaking strength.

[0062] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for preparing a spun yarn, characterized in that: The process includes the following steps: S0: Material selection: Merino superfine wool, Tencel, and nylon filaments are selected as raw materials; S1: The wool is blended and combed to obtain pretreated wool, and the Tencel is blended and combed to obtain pretreated Tencel; S2: The pretreated wool obtained in S1 is blended with half the mass of pretreated Tencel for the first time to obtain a primary blended sliver, and then the blended sliver is blended with the remaining Tencel for the second time to obtain a secondary blended sliver. The secondary blended sliver is then blended to obtain a wool-Tencel blended sliver; S3: The wool-Tencel blended sliver obtained in S2 is first carded and then blended and combed again, followed by combing, 4-5 carding passes, and roving to obtain wool-Tencel roving; S4: The two wool-Tencel rovings obtained in S3 and one nylon filament are blended, spun, and dried to obtain a spun yarn. The spun yarn is produced by feeding double rovings and a single filament and then vacuum-gathering the yarn. The spinning process in S4 includes vacuum gathering, with a vacuum degree of (-20)-(-30) bar and a cradle pressure of 2.4-2.6 bar; The nylon is a nylon filament with water-absorbing particles attached. The preparation steps include: adding propylene glycol and aluminum chloride to an ethanol aqueous solution and stirring evenly to obtain a crosslinking solution; immersing the nylon filament in the crosslinking solution and soaking it; then adding acrylic water-absorbing particles and stirring evenly; taking out the nylon filament and letting it stand to obtain nylon filament with water-absorbing particles attached. The absorbent particles include hygroscopic particles with average particle sizes of 10-20 μm and 30-45 μm; The drying temperature is 100-150℃.

2. The preparation process of the spun yarn according to claim 1, characterized in that: The wool has a fineness of 23-26 micrometers and a length of 70-75 mmH, the Tencel has a fineness of 1.4-1.7 dtex, and the nylon filament has a fineness of 22-24 dtex.

3. The preparation process of the spun yarn according to claim 1, characterized in that: The mass ratio of wool, Tencel, and nylon filament in S1 is (10-12):1:

5.

4. The preparation process of the spun yarn according to claim 1, characterized in that: The mass ratio of the hygroscopic particles with average particle sizes of 10-20 μm and 30-45 μm is 1:(1.7-2.1).

5. A spinning machine for spinning yarn, characterized in that: The process for preparing spun yarn as described in any one of claims 1-4 includes a spinning device. The spinning device is provided with a roving feeder (11), a roving feeder (12), a back roller (3), a middle roller (4), and a vacuum gathering device in sequence along the roving conveying direction. The front roller (7) and the filament enter the vacuum gathering device through the filament feeder (21) and merge with the roving. The vacuum gathering device includes a guide roller (5) and a suction pipe (6). A drying device (8) is provided below the front roller.

6. The spinning equipment for spun yarn according to claim 5, characterized in that: The drying temperature of the drying device (8) is 100-150℃.

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