A bio-based polyamide-based military blended yarn, a spinning processing method thereof and application thereof

Abstract

The application provides a kind of bio-based polyamide fiber-based military blended yarn, its spinning processing method and application.The military blended yarn includes two compact spun yarns and two bio-based polyamide filaments;one compact spun yarn and one bio-based polyamide filament are twisted to obtain an initial twisted yarn;two initial twisted yarns are twisted to obtain a military blended yarn.The military blended yarn obtained by the method has high strength, good evenness and less hair, and can meet the requirements of military blended yarn.

Description

Technical Field

[0001] This invention relates to a military-grade blended yarn based on bio-based nylon, its spinning process and application, belonging to the field of textile technology. Background Technology

[0002] Semi-worsted yarns fall between worsted and woolen yarns in terms of product properties and quality. While the quality of woolen yarns is generally lower than that of worsted yarns, the worsted spinning process is longer and more expensive. The semi-worsted spinning process combines the wool spinning and worsted spinning processes: the wool blending step and the worsted carding, drawing, roving, spinning, and winding steps. The combing step is omitted because chemical fibers, unlike cotton, contain virtually no short fibers, and these are not generated during the spinning process. The main reasons for using semi-worsted spinning are its low cost, relatively good yarn quality, and the ability to thoroughly and evenly mix multiple fibers.

[0003] Ring spinning is a mechanical spinning method in which the yarn is twisted by a spindle, ring, and traveler, and then drafted by rollers. The breaking strength of traditional ring-spun yarns can no longer meet the strength requirements of military yarns. In terms of quality indicators, the breaking strength, evenness, and hairiness of traditional ring-spun yarns are inferior to those of newer yarns such as compact spun yarns, covered yarns, and retwisted yarns.

[0004] Compact spinning is a spinning technique performed on an improved ring spinning frame. Its main technical advantage is the addition of a fiber cohesion zone before the traction device, essentially eliminating the spinning twisting triangle between the front roller and the twisting point. After exiting from the front roller, the fiber sliver first passes through a shaped suction tube and an outer mesh apron. Moving on the mesh apron, the sliver is gathered and rotated by the airflow's contraction and aggregation, gradually transforming from a flat strip into a cylinder through the suction grooves of the shaped tube. The fiber ends are all twisted into the yarn, resulting in a very compact yarn. The main reason for using compact spinning is to improve the yarn's breaking strength and evenness, and the yarn also has the advantages of a smooth appearance and less hairiness.

[0005] Covered yarn, also known as wrapped yarn, is a new type of yarn with a core of filament or staple fiber wrapped around another type of filament or staple fiber yarn. The outer wrapping yarn wraps around the core yarn in a spiral pattern. Its characteristics include evenness, fullness, smoothness with minimal fuzz, high strength, and low breakage.

[0006] Retwisted yarn is a spinning method that involves initial twisting and retwisting of filaments or yarns. The filaments mainly consist of nylon filament, viscose filament, and polyester filament, with no special requirements for the yarn type. However, the yarn's breaking strength cannot be too low, otherwise it is prone to breakage during spinning. The retwisted yarn process mainly includes winding, initial twisting, and retwisting. Winding involves evenly winding one or two filaments onto an I-beam bobbin to meet the requirements of subsequent processing. Initial twisting involves further twisting the filaments on the I-beam bobbin. Retwisting involves combining and twisting the two initially twisted filaments together again.

[0007] The strength, evenness, and hairiness of blended yarns prepared by existing methods are difficult to meet the requirements of military yarns. There is an urgent need for a blended yarn with high strength, good evenness, and low hairiness to meet the requirements of military yarns. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a military-grade blended yarn based on bio-based nylon, its spinning process, and its applications. The blended yarn obtained by the method of this invention has high strength, good evenness, and low hairiness, meeting the requirements for military-grade blended yarns.

[0009] The technical solution of the present invention is as follows:

[0010] A military-grade blended yarn based on bio-based nylon, the military-grade blended yarn comprising two compactly spun yarns and two bio-based nylon filaments; one compactly spun yarn and one bio-based nylon filament are initially twisted to obtain a spun yarn; the two spun yarns are then re-twisted to obtain the military-grade blended yarn.

[0011] According to a preferred embodiment of the present invention, the compact spun yarn is composed of lyocell fiber and vinylon fiber, with a mass ratio of lyocell fiber to vinylon fiber of 30-60:20-40; the linear density of the compact spun yarn is 10-100 tex, the yarn twist coefficient is 350-450, and the high yarn twist coefficient is designed to ensure yarn strength, with the twist direction being S-direction or Z-direction.

[0012] According to a preferred embodiment of the present invention, the bio-based nylon filament is fully drawn yarn (FDY) with a fineness of 40D-100D and a porosity of 1F-24F; the smaller the porosity, the stiffer the feel. Bio-based nylon is prepared from natural biomass such as sorghum, corn, and wheat through microbial, physical, and chemical methods. It is environmentally friendly, has excellent performance, and can improve the comfort of fabrics. Its water absorption, strength, softness, moisture absorption, resilience, and dyeing properties are all superior to those of commonly used nylon 6 and nylon 66.

[0013] According to the present invention, preferably, the twist directions of the initial twist and the secondary twist are opposite, that is, if the initial twist is in the Z direction, the secondary twist is in the S direction, or if the initial twist is in the S direction, the secondary twist is in the Z direction; preferably, the twist direction of the compact spun yarn is opposite to the twist direction of the initial twist.

[0014] According to a preferred embodiment of the present invention, the initial twist coefficient is 300-400; the secondary twist coefficient is 320-450. To ensure yarn strength, the twist coefficient should be designed to be relatively high.

[0015] According to a preferred embodiment of the present invention, the mass ratio of compactly spun yarn to bio-based nylon filament in military blended yarn is 70-80:20-30.

[0016] According to a preferred embodiment of the present invention, the military blended yarn has a breaking elongation of 9-12.5%, a breaking strength of 24-35 cN / tex, a yarn evenness CV value of 7.5-8.2%, and a hairiness value H of 3.7-3.9; preferably, the military blended yarn has a breaking elongation of 11.5-12.2%, a breaking strength of 30.1-33.3 cN / tex, a yarn evenness CV value of 7.95-8.08%, and a hairiness value H of 3.75-3.88.

[0017] The above-mentioned spinning process for military blended yarn based on bio-based nylon includes the following steps: a compact spun yarn and a bio-based nylon filament are wound and initially twisted to obtain a spun yarn; the two spun yarns are then re-twisted to obtain military blended yarn.

[0018] According to the present invention, winding involves uniformly winding bio-based nylon filaments and compactly spun yarn onto an I-beam tube for the next process. Preferably, the winding speed is controlled at 250-550 meters per minute. Simultaneously with winding, a web-forming operation is performed on the bio-based nylon filaments, with 80 to 120 web nodes per meter. The web-forming operation on the bio-based nylon filaments is performed by air jetting at 0.2 MPa using nozzles on the winding equipment, ensuring the elasticity of the bio-based nylon filaments in subsequent processes and preventing slippage between the bio-based nylon filaments and the compactly spun yarn, which is beneficial for the processing of the next step.

[0019] According to a preferred embodiment of the present invention, the compact spun yarn is made from lyocell fiber and vinylon fiber as raw materials, and is obtained by spun yarn through processes such as carding, drawing, roving, spinning, and self-winding.

[0020] Preferably, the compact spun yarn uses vinylon fiber to ensure the yarn's warmth and abrasion resistance, and lyocell fiber to ensure its strength. Lyocell fiber is a natural plant fiber and is a green fiber. Clothing made from this fiber not only has a natural luster, smooth feel, high strength, and minimal shrinkage, but also good moisture permeability and breathability. Vinylon has high moisture absorption, and its performance is close to that of cotton. The fiber length of lyocell or vinylon fiber is 38mm or 51mm. Excessive fiber length will cause uneven drafting in the drawing, roving, and spinning processes. The linear density of lyocell fiber is 1.1-2.2 dtex, and the linear density of vinylon fiber is 1.1-2.2 dtex.

[0021] Preferably, use a fuzzing machine to loosen and fuzz the fibers 1-3 times.

[0022] Preferably, the carding process parameters are as follows: using a flatbed carding machine, the carding weight is 18-23 grams / 5 meters. To ensure the carding effect, the cylinder-flatbed spacing of the carding machine is 12-15 thousandths of an inch, the feedboard-licker-in spacing is 9-12 thousandths of an inch, the licker-in speed is 350-450 rpm, the cylinder speed is 300-450 rpm, and the doffer speed is 23-28 rpm. The carding process combs the mixed fiber bundles after blending into single fibers, making the mixed fibers straight and parallel to each other, producing uniform slivers of a certain specification and quality, which are then regularly coiled in sliver cans, and also have a certain impurity removal effect.

[0023] Preferably, the drawing process parameters are as follows: The drawing process includes a first drawing and a second drawing. The second drawing uses a self-leveling machine to ensure that the evenness of the drawn sliver meets the requirements. The first drawing combines 6-8 carded slivers into one sliver, reducing the sliver unevenness, further straightening and parallelizing the fibers, and ensuring that the various fiber components in the sliver are evenly mixed. The basis weight of the sliver in the first drawing is 18-24 grams / 5 meters, the draft ratio is 6-9 times, and the roller center distance in the first drawing is 54*60 mm. The sliver thickness is 62*68mm or 62*68mm, and the machine speed is 260-330 meters / minute. The second drawing process combines 6-8 carded slivers into one sliver. The basis weight of the second drawing sliver is 18-24 grams / 5 meters, the draft ratio is 6.5-7.5 times, the roller center distance is 54*60mm or 62*68mm, and the machine speed is 260-330 meters / minute. The sliver weight unevenness of the second drawing sliver should be less than 1.0%, and the evenness unevenness should be less than 3.5%.

[0024] Preferably, the roving process parameters are as follows: roving basis weight is 5-11 g / 10 m, draft ratio is 4-8 times, roving roller center distance is 54*60 mm or 62*68 mm, roving twist coefficient is controlled at 60-100, and machine speed is 800-1000 r / min. The roving process involves drawing and thinning the sliver and further parallelizing the fibers. Since the strength of the sliver is relatively low after drafting by the roving frame, a certain twist needs to be added to improve the roving strength to avoid accidental elongation during winding and unwinding. Then, the twisted roving is wound onto a bobbin to form a package of a certain shape and size.

[0025] Preferably, the fine spinning process parameters are as follows: fine yarn linear density 10-100 tex, fine yarn twist coefficient 350-450, with a slightly higher design to ensure yarn strength, twist direction S or Z, draft ratio 20-40 times, and front roller speed 100-180 r / min. The fine spinning process adopts a compact spinning method, where the roving is evenly drawn and thinned to the required linear density, and then passes through a shaped suction tube with a mesh apron. The sliver moves on the mesh apron, and due to the contraction and aggregation of the airflow, the sliver is gathered and rotated through the suction groove of the shaped tube, gradually changing from a flat strip to a cylinder. Then, an appropriate twist is added to the drafted sliver to give the single yarn certain physical and mechanical properties such as strength, elasticity, and luster. Finally, the fine yarn is wound into a tube for self-winding.

[0026] Preferably, the self-winding process parameters are as follows: using an automatic winding machine, the self-winding bobbin weighs 1.0-1.5 kg, the self-winding machine speed is 800-1000 m / min, and the finished product is packaged in bobbins and formed by the automatic winding machine. The self-winding process involves unwinding the bobbins produced by fine yarn production using an automatic winding machine and then winding them into bobbins with a large capacity that can meet the requirements of subsequent processing, while cutting off some defects and impurities on the yarn.

[0027] The above-mentioned blended yarns are used in military blended yarns.

[0028] The beneficial effects of this invention are as follows:

[0029] The blended yarn obtained by the method of this invention has high strength, good evenness, and low hairiness, which can meet the strength requirements of military blended yarn. At the same time, it has good breathability and warmth retention. All raw materials used are green fibers that are easy to degrade and recyclable. Attached Figure Description

[0030] Figure 1 This is a diagram of the yarn structure after initial twisting;

[0031] Figure 2 This is a diagram of the yarn structure after retwisting;

[0032] Among them, 1 is compact spun yarn, 2 is bio-based nylon filament, and 3 is untwisted yarn. Detailed Implementation

[0033] The present invention will be further described below through specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0034] Unless otherwise specified, all raw materials used in the embodiments can be obtained commercially or prepared using existing technologies; all methods used are conventional methods unless otherwise specified, and all equipment used are conventional equipment unless otherwise specified.

[0035] In this embodiment, the bio-based nylon filament used is "Taylun" from Shanghai Kaisai Biotechnology Co., Ltd.

[0036] Example 1:

[0037] A spinning process for military-grade blended yarn based on bio-based nylon, comprising the following steps:

[0038] 1. Raw material selection: By weight, the composition is: 50% Lyocell fiber / 26% Vinylon fiber / 24% Bio-based Nylon filament. The Lyocell fiber uses short fibers with a specification of 1.43dtex*38mm, the Vinylon fiber uses short fibers with a specification of 1.67dtex*38mm, and the bio-based nylon filament is fully drawn yarn (FDY) with a specification of 40D / 12F.

[0039] 2. Woven Fiber: Lyocell and vinylon fibers are opened and fused together twice using a B262 woven fiber machine. Because these two fibers have high moisture regain and are not prone to static electricity, no antistatic agent or softened water needs to be added during the woven fiber process.

[0040] 3. Carding: The carding equipment uses a FA186D flat carding machine with a carding weight of 18.0 g / 5 m, a flat-to-cylinder spacing of 14*12*12*12*13 0.1 inch, a feed plate-to-licker-in spacing of 0.9 inch, a licker-in speed of 430 r / min, a cylinder speed of 430 r / min, and a doffer speed of 23 r / min.

[0041] 4. Drawing: The drawing process includes first and second drawing. The first drawing machine uses an FA306 model, combining 8 carded slivers into 1, with a basis weight of 18.0 g / 5 m, a draft ratio of 8.0, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The second drawing machine uses an FA326 model, combining 7 first-draw slivers into 1, with a basis weight of 18 g / 5 m, a draft ratio of 7, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The sliver weight unevenness of the second drawing should be less than 1.0%, and the evenness should be less than 3.5%.

[0042] 5. Roving: The roving equipment uses an FA457 roving frame with a roving weight of 5.0 g / 10 m, a draft ratio of 7.2, a roller center distance of 54*60 mm, a roving twist coefficient of 71.2, and a machine speed of 800 r / min.

[0043] 6. Spinning: The spinning equipment is an FA506 spinning machine equipped with a compact spinning device. It uses a compact spinning process to spin yarn with a linear density of 14.0 tex, a draft ratio of 35.7, a twist coefficient of 420, a twist direction of Z, and a front roller speed of 130 r / min.

[0044] 7. Automatic winding: The automatic winding equipment uses the Autoconer X5 automatic winding machine, which can effectively remove defects and foreign fiber impurities. The automatic winding electro-cleaning uses a capacitor electro-cleaning, with a drum weight of 1.0 kg / drum, a spindle speed of 800 m / min, and a drum-packed pagoda paper tube to obtain compact spun yarn.

[0045] 8. Winding: The bio-based nylon filament and compact spun yarn are evenly wound onto the I-beam tube used in the next process. The machine speed is controlled at 300 meters / minute. At the same time, the nozzles installed on the winding equipment use air pressure of 0.2 MPa to spray the bio-based nylon filament to form a web (100 network nodes per meter). This ensures the elasticity of the bio-based nylon filament in the subsequent process and prevents slippage between the bio-based nylon filament and the compact spun yarn, which is beneficial to the processing of the next process.

[0046] 9. Initial Twist and Retwist: The yarn produced in the winding process undergoes initial twist and retwist. A compactly spun yarn and a bio-based nylon filament are twisted in the S-direction with a twist coefficient of 370 to obtain initially twisted yarn, such as... Figure 1 As shown; then the two initially twisted yarns are combined and re-twisted, with the twist direction being Z and the twist coefficient being 370, to obtain military-grade blended yarn, as shown. Figure 2 As shown.

[0047] Example 2:

[0048] A spinning process for military-grade blended yarn based on bio-based nylon, as described in Example 1, except that:

[0049] Adjusting the twist coefficient of the retwisting, a compact spun yarn and a bio-based nylon filament are twisted in the S direction with a twist coefficient of 370 to obtain a nascent yarn; then the two nascent yarns are combined and retwisted in the Z direction with a twist coefficient of 420 to obtain a military-grade blended yarn. Other steps and conditions are the same as in Example 1.

[0050] Example 3:

[0051] A spinning process for military-grade blended yarn based on bio-based nylon, as described in Example 1, except that:

[0052] Adjusting the twist coefficient of the retwisting, a compact spun yarn and a bio-based nylon filament are twisted in the S direction with a twist coefficient of 370 to obtain a nascent yarn; then the two nascent yarns are combined and retwisted in the Z direction with a twist coefficient of 320 to obtain a military-grade blended yarn. Other steps and conditions are the same as in Example 1.

[0053] Comparative Example 1:

[0054] A spinning process for military-grade blended yarn based on bio-based nylon, as described in Example 1, except that:

[0055] Adjusting the twist direction of the initial twist and retwisting, a compact spun yarn and a bio-based nylon filament are twisted in the Z direction with a twist coefficient of 370 to obtain the initial twisted yarn; then the two initial twisted yarns are combined and retwisted in the S direction with a twist coefficient of 370 to obtain military-grade blended yarn. Other steps and conditions are the same as in Example 1.

[0056] Comparative Example 2:

[0057] A method for preparing ring-spun blended yarn based on bio-based nylon, the method comprising the following steps:

[0058] 1. Raw material selection: By weight, the composition is: 50% Lyocell fiber / 26% Vinylon fiber / 24% Bio-based Nylon fiber. Lyocell fiber uses short fibers with a specification of 1.43 dtex * 38 mm; Vinylon fiber uses short fibers with a specification of 1.67 dtex * 38 mm; and Bio-based Nylon fiber uses short fibers with a specification of 1.67 dtex * 38 mm.

[0059] 2. Wool blending: Add 1.0 wt% (percentage of bio-based nylon) of TF-480 antistatic agent and 6.0 wt% (percentage of bio-based nylon) of softened water to bio-based nylon. Then, use a B262 wool blending machine to open and blend the bio-based nylon, lyocell fiber and vinylon fiber together twice before proceeding to the next process.

[0060] 3. Carding: The carding equipment uses a FA186D flat carding machine with a carding weight of 18.0 g / 5 m, a flat-to-cylinder spacing of 14*12*12*12*13 0.1 inch, a feed plate-to-licker-in spacing of 0.9 inch, a licker-in speed of 430 r / min, a cylinder speed of 430 r / min, and a doffer speed of 23 r / min.

[0061] 4. Drawing: The drawing process includes first and second drawing. The first drawing machine uses an FA306 model, combining 8 carded slivers into 1, with a basis weight of 18.0 g / 5 m, a draft ratio of 8.0, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The second drawing machine uses an FA326 model, combining 7 first-draw slivers into 1, with a basis weight of 18 g / 5 m, a draft ratio of 7, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The sliver weight unevenness of the second drawing should be less than 1.0%, and the evenness should be less than 3.5%.

[0062] 5. Roving: The roving equipment uses an FA457 roving frame with a roving weight of 6.5 g / 10 m, a draft ratio of 5.5, a roller center distance of 54*60 mm, a roving twist coefficient of 75.0, and a machine speed of 800 r / min.

[0063] 6. Spinning: The spinning equipment uses an FA506 spinning frame with a yarn linear density of 18.5 tex, a draft ratio of 35.1, a yarn twist coefficient of 420, and a front roller speed of 130 r / min.

[0064] 7. Automatic winding: The automatic winding equipment uses the Autoconer X5 automatic winding machine, which can effectively remove defects and foreign fiber impurities. The automatic winding electro-cleaning uses a capacitor electro-cleaning, with a drum weight of 1.0 kg / drum and a spindle speed of 800 m / min. The drum is packed with pagoda paper tubes.

[0065] 8. Bundling: Evenly wind the two tubes of yarn together onto the parallel tube used in the next process at a speed of 300 meters per minute.

[0066] 9. Twist: Twist the yarn after it has been doubling in the S direction, with a twist coefficient of 370.

[0067] Comparative Example 3:

[0068] A method for preparing core-spun yarn based on bio-based nylon, the method comprising the following steps:

[0069] 1. Raw material selection: By weight, the composition is: 50% Lyocell fiber / 26% Vinylon fiber / 24% Bio-based Nylon filament. The Lyocell fiber uses short fibers with a specification of 1.43dtex*38mm, the Vinylon fiber uses short fibers with a specification of 1.67dtex*38mm, and the bio-based nylon filament is fully drawn yarn (FDY) with a specification of 40D / 12F.

[0070] 2. Wool blending: Lyocell fiber and vinylon fiber are opened and blended twice using a B262 wool blending machine. Because these two fibers have high moisture regain and are not prone to static electricity, there is no need to add antistatic agent or softened water during the wool blending process.

[0071] 3. Carding: The carding equipment uses a FA186D flat carding machine with a carding weight of 18.0 g / 5 m, a flat-to-cylinder spacing of 14*12*12*12*13 0.1 inch, a feed plate-to-licker-in spacing of 0.9 inch, a licker-in speed of 430 r / min, a cylinder speed of 430 r / min, and a doffer speed of 23 r / min.

[0072] 4. Drawing: The drawing process includes first and second drawing. The first drawing machine uses an FA306 model, combining 8 carded slivers into 1, with a basis weight of 18.0 g / 5 m, a draft ratio of 8.0, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The second drawing machine uses an FA326 model, combining 7 first-draw slivers into 1, with a basis weight of 18 g / 5 m, a draft ratio of 7, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The sliver weight unevenness of the second drawing should be less than 1.0%, and the evenness should be less than 3.5%.

[0073] 5. Roving: The roving equipment uses an FA457 roving frame with a roving weight of 5.0 g / 10 m, a draft ratio of 7.2, a roller center distance of 54*60 mm, a roving twist coefficient of 71.2, and a machine speed of 800 r / min.

[0074] 6. Spinning: The spinning process uses a 40D / 12F bio-based nylon filament as the core yarn to make core-spun yarn, and a roving is wrapped around the core yarn in the Z direction. The spinning equipment is an FA506 spinning machine with a yarn linear density of 18.5 tex, a draft ratio of 35.7, a yarn twist coefficient of 420, and a front roller speed of 130 r / min.

[0075] 7. Automatic winding: The automatic winding equipment uses the Autoconer X5 automatic winding machine, which can effectively remove defects and foreign fiber impurities. The automatic winding electro-cleaning uses a capacitor electro-cleaning, with a drum weight of 1.0 kg / drum and a spindle speed of 800 m / min. The drum is packed with pagoda paper tubes.

[0076] 8. Bundling: Evenly wind the two tubes of yarn together onto the parallel tube used in the next process at a speed of 300 meters per minute.

[0077] 9. Twist: Twist the yarn after it has been doubling in the S direction, with a twist coefficient of 370.

[0078] Comparative Example 4:

[0079] A method for preparing core-spun yarn based on bio-based nylon, the method comprising the following steps:

[0080] 1. Raw material selection: By weight, the composition is: 50% Lyocell fiber / 26% Vinylon fiber / 24% Bio-based Nylon filament. The Lyocell fiber uses short fibers with a specification of 1.43dtex*38mm, the Vinylon fiber uses short fibers with a specification of 1.67dtex*38mm, and the bio-based nylon filament is fully drawn yarn (FDY) with a specification of 40D / 12F.

[0081] 2. Wool blending: Lyocell fiber and vinylon fiber are opened and blended twice using a B262 wool blending machine. Because these two fibers have high moisture regain and are not prone to static electricity, there is no need to add antistatic agent or softened water during the wool blending process.

[0082] 3. Carding: The carding equipment uses a FA186D flat carding machine with a carding weight of 18.0 g / 5 m, a flat-to-cylinder spacing of 14*12*12*12*13 0.1 inch, a feed plate-to-licker-in spacing of 0.9 inch, a licker-in speed of 430 r / min, a cylinder speed of 430 r / min, and a doffer speed of 23 r / min.

[0083] 4. Drawing: The drawing process includes first and second drawing. The first drawing machine uses an FA306 model, combining 8 carded slivers into 1, with a basis weight of 23.0 g / 5 m, a draft ratio of 6.26, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The second drawing machine uses an FA326 model, combining 7 first-draw slivers into 1, with a basis weight of 23 g / 5 m, a draft ratio of 7, a roller center distance of 54*60 mm, and a machine speed of 260 m / min. The sliver weight unevenness of the second drawing should be less than 1.0%, and the evenness should be less than 3.5%.

[0084] 5. Roving: The roving equipment uses an FA457 roving frame with a roving weight of 8.0 g / 10 m, a draft ratio of 5.75, a roller center distance of 54*60 mm, a roving twist coefficient of 71.2, and a machine speed of 800 r / min.

[0085] 6. Spinning: The spinning equipment uses an FA506 spinning frame with a yarn linear density of 28.1 tex, a draft ratio of 28.5, a yarn twist coefficient of 420, a twist direction of Z, and a front roller speed of 180 r / min.

[0086] 7. Automatic winding: The automatic winding equipment uses the Autoconer X5 automatic winding machine, which can effectively remove defects and foreign fiber impurities. The automatic winding electro-cleaning uses a capacitor electro-cleaning, with a drum weight of 1.0 kg / drum and a spindle speed of 800 m / min. The drum is packed with pagoda paper tubes.

[0087] 8. Winding: The bio-based nylon filament is evenly wound onto the I-beam tube used in the next process. The machine speed is controlled at 300 meters / minute, which is beneficial to the processing of the next process.

[0088] 9. Wrapping: Using a yarn as the core yarn, first wrap a 40D / 12F bio-based nylon filament in the S direction around the core yarn with a twist coefficient of 370, and then wrap a 40D / 12F bio-based nylon filament in the Z direction around the core yarn with a twist coefficient of 370.

[0089] Test case

[0090] 1. Tensile property test method:

[0091] The tensile breaking strength and elongation of blended yarns were tested in accordance with GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles (CRE method)".

[0092] 2. Dry strip uniformity test:

[0093] The linear density unevenness of blended yarns was tested according to GB / T 3292.1-2008 "Test Method for Evenness of Yarn in Textiles - Capacitance Method". The formula for calculating the evenness CV value is the standard deviation / average value of the experimental data.

[0094] 3. Feather value test:

[0095] The hairiness value H of the blended yarn was measured using a YG172 yarn hairiness tester.

[0096] Table 1 Comparison of Blended Yarn Quality

[0097]

[0098] As shown in Table 1, the blended yarn obtained by the method of the present invention effectively reduces the hairiness value due to the use of filaments and yarns for twisting. The covered yarn has an even lower hairiness value, but its strength is not as good as that of the present invention. The ring-spun and core-spun yarns have a significant difference in breaking strength and hairiness value compared to the method of the present invention. The twist direction of the initial twist and the retwist is preferably the same as that of the compact spun yarn. If the twist direction of the compact spun yarn is Z, then the initial twist direction is S and the retwist is Z; if the twist direction of the compact spun yarn is S, then the initial twist direction is Z and the retwist is S. The twist coefficient ratio of the retwist to the initial twist is preferably between 1.0 and 1.1. Too large or too small a ratio will lead to a decrease in strength.

[0099] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A military-grade blended yarn based on bio-based nylon, characterized in that, The military blended yarn comprises two compactly spun yarns and two bio-based nylon filaments; one compactly spun yarn and one bio-based nylon filament are initially twisted to obtain a first-twist yarn; the two first-twist yarns are then re-twisted to obtain the military blended yarn. Compact spun yarn is composed of lyocell fiber and vinylon fiber, with a mass ratio of lyocell fiber to vinylon fiber of 30-60:20-40; compact spun yarn has a linear density of 10-100 tex, a yarn twist coefficient of 350-450, and a twist direction of S or Z. Bio-based nylon filaments are made of fully drawn yarn (FDY) with a fineness of 40D-100D and a hole count of 1F-24F. The twist direction of the initial twist and the retwist is opposite, that is, if the initial twist is in the Z direction, the retwist is in the S direction, or if the initial twist is in the S direction, the retwist is in the Z direction; the twist direction of the compact yarn is opposite to the twist direction of the initial twist. The initial twist coefficient is 300-400; the compound twist coefficient is 320-370. In military blended yarns, the mass ratio of compact spun yarn to bio-based nylon filament is 70-80:20-30. The spinning process of the military blended yarn based on bio-based nylon includes the following steps: a compact spun yarn and a bio-based nylon filament are wound and initially twisted to obtain a pre-twisted yarn; the two pre-twisted yarns are then re-twisted to obtain the military blended yarn. The winding speed is controlled at 250-550 meters per minute; while winding, the bio-based nylon filament is netted, with 80 to 120 network nodes per meter; Compact spun yarn is made from lyocell and vinylon fibers through processes such as blending, carding, drawing, roving, spinning, and self-winding.

2. The military-grade blended yarn based on bio-based nylon according to claim 1, characterized in that, Includes one or more of the following conditions: i. The fiber length of lyocell or vinylon fiber is 38mm or 51mm; the linear density of lyocell fiber is 1.1-2.2dtex, and the linear density of vinylon fiber is 1.1-2.2dtex; ii. Use a pile-opening machine to loosen and open the pile 1-3 times; iii. The carding process parameters are as follows: Use a flatbed carding machine, carding weight 18-23 g / 5 m, cylinder-flatbed spacing 12-15 kilometres, feedboard-licker-in spacing 9-12 kilometres, licker-in speed 350-450 r / min, cylinder speed 300-450 r / min, doffer speed 23-28 r / min; iv. The drawing process parameters are as follows: The drawing process includes first drawing and second drawing. First drawing combines 6-8 carded slivers into one sliver. The basis weight of the sliver in first drawing is 18-24 grams / 5 meters, the draft ratio is 6-9 times, the center distance of the rollers in first drawing is 54*60mm or 62*68mm, and the machine speed is 260-330 meters / minute. Second drawing combines 6-8 carded slivers into one sliver. The basis weight of the sliver in second drawing is 18-24 grams / 5 meters, the draft ratio is 6.5-7.5 times, the center distance of the rollers in second drawing is 54*60mm or 62*68mm, and the machine speed is 260-330 meters / minute. The sliver weight unevenness of the second drawing sliver should be less than 1.0%, and the evenness unevenness should be less than 3.5%. v. The roving process parameters are as follows: the basis weight of the roving is 5-11 grams / 10 meters, the draft ratio is 4-8 times, the center distance of the roving rollers is 54*60mm or 62*68mm, the roving twist coefficient is controlled at 60-100, and the machine speed is 800-1000r / min. vi. The fine yarn process parameters are as follows: fine yarn linear density 10-100 tex, fine yarn twist coefficient 350-450, with a higher design to ensure yarn strength, twist direction S or Z, draft ratio 20-40 times, and front roller speed 100-180 r / min. vii. The automatic winding process parameters are as follows: use an automatic winding machine, the weight of the winding drum is 1.0-1.5 kg, the winding speed is 800-1000 m / min, and the finished product is packaged in drums.

3. The application of the blended yarn as described in any one of claims 1-2 in military blended yarn.

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