Manufacturing process of viscose / polyimide / modacrylic / aramid / polyamide blended flame retardant yarn

Abstract

A manufacturing process for viscose / polyimide / acrylic chlorofiber / aramid / nylon blended flame-retardant yarn relates to the field of textile production technology. This invention involves processes such as opening, carding, drawing, roving, spinning, and winding. Hydrophilic and moisture-absorbing viscose fiber, skin-friendly and soft acrylic chlorofiber fiber, and strong and abrasion-resistant nylon fiber are blended to form a sliver. Then, polyimide fiber (good flame retardancy, poor spinnability) and aramid fiber (low thermal decomposition, good spinnability) are complementary and made into a sliver. The two different slivers are blended on a drawing frame in three stages, resulting in minimal differences in fiber count and fiber type, good color consistency, and uniform flame retardancy in the blended yarn. The fire-fighting suits made from this viscose / polyimide / acrylic chlorofiber / aramid / nylon blended flame-retardant yarn offer superior comfort compared to existing flame-retardant fabrics on the market, avoiding homogeneous competition and providing the textile industry with a fully functional and comfortable flame-retardant textile product.

Description

Technical Field

[0001] This invention relates to the field of textile production technology, specifically a manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn. Background Technology

[0002] With socio-economic development and the continuous improvement of people's living standards, forest fires, fires involving various electrical appliances, and fires in high-rise buildings caused by extreme weather events worldwide are placing increasingly higher demands on urban fire protection. Currently, most fire-fighting fabrics are designed to increase the fabric's flame-retardant temperature. However, due to limitations in the thermal decomposition temperature of fibers, very few fiber types are used to manufacture yarns, resulting in limited functionality. Aside from flame-retardant properties, other wear-related functions such as comfort, abrasion resistance, and moisture absorption are poor, making existing fire-fighting fabrics unsuitable for use as close-fitting clothing.

[0003] In order to fully utilize the advantages of various flame-retardant fibers, produce suitable yarns and corresponding fabrics, realize the multifunctionality of flame-retardant fabrics, make flame-retardant fabrics skin-friendly, add another layer of safety protection between the skin and flame-retardant clothing and equipment, and give full play to their positive role, it is particularly important to study a manufacturing process for viscose / polyimide / acrylic chlorofiber / aramid / nylon blended flame-retardant yarn. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide a manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn, which blends flame-retardant fibers with suitable fibers to fully utilize the functional characteristics of each fiber, so as to weave a fire-fighting fabric that is functional, comfortable to wear and fireproof.

[0005] To achieve the above-mentioned objectives, the present invention provides a manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn, comprising the following steps: S1. Cleaning process: ① First, manually shred the viscose fiber, acrylic fiber, and nylon fiber. Then, manually mix the viscose fiber, acrylic fiber, and nylon fiber in a weight ratio of 7:5:1. After spraying with an antistatic agent and curing for 24 hours, manually load the mixture into a trough. After passing through the A002A cotton grabber → A035C cotton opening and mixing machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap is produced. ② The polyimide fiber and aramid fiber are manually shredded, and then the polyimide fiber and aramid fiber are manually mixed evenly in a weight ratio of 5:2. After spraying with an antistatic agent and curing for 24 hours, they are manually loaded into the trough. After passing through the A002A cotton grabber → A035C cotton opening machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap 2 is made. Process parameters for the opening and closing process: The carding beater speed of the FA106C porcupine opening machine is 380 rpm, the combined beater speed of the A076C single beater lap forming machine is 780 rpm, the lap forming roller speed is 11 rpm, and the weight of the mixed lap is 330 g / m. S2, Carding process: Two types of mixed laps, lap 1 and lap 2, produced in the opening and closing process, were processed into slivers on an A186D carding machine. The process parameters were as follows: the dry weight of the slivers was 16 grams per 5 meters, the flatness speed of both mixed laps was 168 mm / min, the dust removal knife was level with the machine frame at an angle of 90°, the distance between the cylinder and the movable flatness was 0.23 mm, 0.20 mm, 0.18 mm, 0.18 mm, and 0.20 mm, respectively, and the sliver exit speed was 41 meters per minute. Among them, the cylinder speed of the mixed roll of viscose fiber, acrylic fiber, and nylon fiber is 300 rpm and the licker-in speed is 600 rpm, while the cylinder speed of the mixed roll of polyimide fiber and aramid fiber is 330 rpm and the licker-in speed is 660 rpm. S3, Drawing process: Three-stage rolling process is adopted: ① Take three strips of each of the two types of raw strips and combine them once to make a first drawing frame; the first drawing frame has a dry weight of 17.5 grams / 5 meters, a total draft ratio of 5.49, and a roller grip distance of 56mm×60mm; the pressure roller linear speed of the drawing frame is 250 meters / minute; the drafting rollers are treated with antistatic agents beforehand. ② Combine six first-stage drawing slivers to obtain a second-stage drawing sliver; the second-stage drawing sliver has a dry weight of 17.5 g / 5 m, a total draft ratio of 6, and a roller grip distance of 54 mm × 58 mm; the pressure roller linear speed of the drawing frame is 250 m / min; the drafting rollers are pre-treated with antistatic agents. ③ Combine six second-pass slivers to obtain cooked slivers. The weight of the cooked slivers is 17.5 grams per 5 meters, the total draw ratio is 6, and the roller grip distance is 53mm × 55mm. The linear speed of the pressure rollers of the drawing machine is 250 meters per minute. The drawing rollers are treated with antistatic agents beforehand. S4. Roving process: The sliver is produced into roving using an FA468E roving frame. The roving dry weight is 4.5 g / 10 m, the draft ratio is 7.78, the back zone draft ratio is 1.27, the twist coefficient is 70, the roller spacing is 25 mm × 25 mm × 27 mm, the roller diameter is 28.5 mm × 28.5 mm × 28.5 mm, the spindle speed is 600 rpm, and the spacer blocks are 8.0 mm. The rollers are pre-treated with antistatic agents. S5. Spinning process: The DTM129 ring spinning machine is used to produce 14.6 tex compact spun flame-retardant yarn. The process parameters are as follows: the draft ratio of the ring spinning machine is 35.13, the back zone draft ratio is 1.148, the twist coefficient is 340, the roller spacing is 27mm×40mm, the roller diameter is 25mm×25mm×25mm, the upper pin nip spacing uses a 3.0 mm pressure bar spacer block, the ring is PG1 / 2-4254, the traveler is Jinmao TPJM1 / 2 ES gc traveler, and the front roller speed is 140 rpm. S6. Winding process: The above-mentioned fine yarn is wound into cones using an AC338RM self-winding machine. The machine speed is 1000 meters / minute, and the neps are reduced by an electric cleaning process of 280%. The machine also opens the foreign fiber channel to remove color knots and short, thick knots.

[0006] Furthermore, the blended flame-retardant yarn is composed of viscose fiber, polyimide fiber, acrylic fiber, aramid fiber, and nylon fiber. Viscose fiber accounts for 33%-37% of the weight of the blended flame-retardant yarn, polyimide fiber accounts for 23%-27%, acrylic fiber accounts for 23%-27%, aramid fiber accounts for 8%-12%, and nylon fiber accounts for 3%-7%. The blended flame-retardant yarn is a compact spun flame-retardant yarn with a yarn count of 14.6 tex.

[0007] Furthermore, the viscose fiber has a specification of 1.7 dtex * 40 mm; the polyimide fiber has a specification of 1.67 dtex * 51 mm; the aramid fiber is aramid 1313 with a specification of 1.5 d * 51 mm; the acrylonitrile fiber has a specification of 2.0 d * 38 mm; and the nylon fiber has a specification of 1.8 d * 38 mm. All of the viscose fiber, polyimide fiber, aramid fiber, acrylonitrile fiber, and nylon fiber are flame-retardant fibers.

[0008] Furthermore, the relative humidity of the production environment for the opening, carding, drawing, roving, spinning, and winding processes is 55%-60%.

[0009] Compared with existing technologies, this invention uses a blend of hydrophilic and moisture-absorbing viscose fiber, skin-friendly and soft acrylic fiber, and strong and abrasion-resistant nylon fiber to create a sliver. Then, it combines polyimide fiber (good flame retardancy, poor spinnability) with aramid fiber (low thermal decomposition, good spinnability) to create another sliver. The two different slivers are blended on a drawing frame in three stages, resulting in minimal differences in fiber count and type, good color consistency, and uniform flame retardancy in the finished sliver. The fire-fighting suits made from the viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn produced by this invention offer superior comfort compared to other flame-retardant fabrics on the market, avoiding homogeneous competition and adding a fully functional and comfortable flame-retardant textile product to the textile industry. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of protection of the invention.

[0011] This invention discloses a manufacturing process for a viscose / polyimide / acrylic chlorofiber / aramid / nylon blended flame-retardant yarn. The blended flame-retardant yarn is composed of viscose fiber, polyimide fiber, acrylic chlorofiber fiber, aramid fiber, and nylon fiber. Specifically, viscose fiber accounts for 33%-37% of the weight percentage of the blended flame-retardant yarn, polyimide fiber accounts for 23%-27% of the weight percentage, acrylic chlorofiber fiber accounts for 23%-27% of the weight percentage, aramid fiber accounts for 8%-12% of the weight percentage, and nylon fiber accounts for 3%-7% of the weight percentage. The blended flame-retardant yarn is a compact spun flame-retardant yarn with a yarn count of 14.6 tex.

[0012] Preferably, the viscose fiber is flame-retardant viscose fiber, the aramid fiber is aramid 1313 fiber, and the nylon fiber is flame-retardant nylon fiber. The flame-retardant viscose fiber and flame-retardant nylon fiber of the present invention are produced by adding appropriate amounts of chemical flame retardants, such as halogens, phosphorus-based inorganic substances, during the production and processing of viscose fiber and nylon fiber, thereby making the fiber flame-retardant and improving its flame-retardant performance. Aramid 1313 fiber has higher strength and stiffness than the known aramid 1414 fiber, can withstand higher tensile and compressive forces, and has a higher thermal decomposition temperature, thus performing better in high-temperature environments and is suitable for high-temperature flame-retardant yarns. The flame-retardant viscose fiber, flame-retardant nylon fiber, and aramid 1313 fiber of the present invention are all purchased raw materials.

[0013] Preferably, the viscose fiber has a specification of 1.7 dtex*40 mm, the polyimide fiber has a specification of 1.67 dtex*51 mm, the aramid fiber has a specification of 1.5 d*51 mm, the acrylonitrile fiber has a specification of 2.0 d*38 mm, and the nylon fiber has a specification of 1.8 d*38 mm; all of the viscose fiber, polyimide fiber, aramid fiber, acrylonitrile fiber, and nylon fiber are flame-retardant fibers.

[0014] The viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn described in this invention can be any one of the groups in the embodiments in Table 1: Table 1

[0015] This invention discloses a manufacturing process for a viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn, comprising the following steps: S1. Cleaning process: ① First, manually shred the viscose fiber, acrylic fiber, and nylon fiber. Then, manually mix the viscose fiber, acrylic fiber, and nylon fiber evenly in a weight ratio of 7:5:1. Spray with an antistatic agent (i.e., a non-ionic antistatic agent, a purchased component, suitable for eliminating static electricity during spinning of synthetic fibers such as polyester, nylon, and chlorofiber, with excellent antistatic effect. The concentrated antistatic agent solution accounts for 3% of the fiber mass, and the ratio of the concentrated antistatic agent solution to warm water is 1:3). After curing for 24 hours, manually load the fiber into the trough. After passing through the A002A cotton grabber → A035C cotton opening and mixing machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap is formed.

[0016] ② Manually shred the polyimide fiber and aramid fiber, then manually mix the polyimide fiber and aramid fiber evenly in a 5:2 weight ratio. After spraying with an antistatic agent and curing for 24 hours, manually load the mixture into a trough. After passing through the A002A cotton grabber → A035C cotton opening and mixing machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap 2 is produced.

[0017] After mixing viscose fiber, acrylic fiber, nylon fiber, polyimide fiber, and aramid fiber in the opening process according to the above proportions, the blending ratio of viscose / polyimide / acrylic fiber / aramid / nylon can be set to 35 / 25 / 25 / 10 / 5, that is, viscose fiber (7÷(7+5+1+5+2)=35%), polyimide fiber (5÷(7+5+1+5+2)=25%), acrylic fiber (5÷(7+5+1+5+2)=25%), aramid fiber (2÷(7+5+1+5+2)=10%), and nylon fiber (1÷(7+5+1+5+2)=5%).

[0018] Process parameters for the opening and closing process: The carding beater speed of the FA106C porcupine opening machine is 380 rpm, the combined beater speed of the A076C single beater lap forming machine is 780 rpm, the lap forming roller speed is 11 rpm, and the weight of the mixed lap is 330 g / m.

[0019] S2, Carding process: Two types of mixed laps, lap 1 and lap 2, produced in the opening and closing process, were processed into slivers on an A186D carding machine. The process parameters were as follows: the dry weight of the slivers was 16 grams per 5 meters, the flatness speed of both mixed laps was 168 mm / min, the dust removal knife was level with the machine frame at an angle of 90°, the distance between the cylinder and the movable flatness was 0.23 mm, 0.20 mm, 0.18 mm, 0.18 mm, and 0.20 mm, respectively, and the sliver exit speed was 41 meters per minute. In the first mixed spool of viscose, acrylic, and nylon fibers, the cylinder speed is 300 rpm and the licker-in speed is 600 rpm. Because viscose fibers have a low breaking strength of only 2 cm / dtex and cannot withstand impact, the mixed spool of viscose, acrylic, and nylon fibers is carded at a low speed. However, polyimide and aramid fibers have a breaking strength of 3-4 cm / dtex and a fiber length of 51 mm. Therefore, increasing the cylinder speed improves fiber separation and prevents fibers from getting tangled on the needle teeth. Thus, in the second mixed spool of polyimide and aramid fibers, the cylinder speed is 330 rpm and the licker-in speed is 660 rpm.

[0020] S3, Drawing process: Three-stage rolling process is adopted: ① Take three slivers of each of the two types of raw slivers from the carding process and combine them once to obtain a first drawing sliver; the first drawing sliver has a dry weight of 17.5 g / 5 m, a total draft ratio of 5.49, and a roller grip distance of 56 mm × 60 mm; the pressure roller linear speed of the drawing frame is 250 m / min; the drafting roller is pre-treated with antistatic agents. In this invention, the first drawing drafting roller is selected as a Shore 80-82 degree roller with a surface polishing finish of 0.4-0.8 μm. It is coated twice with JY-Ⅱ colored AB paint at a 1:3 ratio, dried in the dark for 48 hours before being put into use. Every 4 hours, the roller is evenly wiped twice with HD nano antistatic agent, and put into use after 15 minutes.

[0021] ② The six first-stage drawing slivers are combined to obtain a second-stage drawing sliver; the dry weight of the second-stage drawing sliver is 17.5 grams / 5 meters, the total draft ratio is 6, and the roller grip distance is 54mm×58mm; the linear speed of the pressure roller of the drawing frame is 250 meters / minute; the drafting roller is pre-treated with antistatic agents; in this invention, the antistatic treatment of the second-stage drafting roller is the same as that of the first-stage drafting roller.

[0022] ③ Combine six second-stage drawing slivers to obtain a finished sliver. The finished sliver has a dry weight of 17.5 grams per 5 meters, a total draft ratio of 6, and a roller grip distance of 53mm × 55mm. The linear speed of the pressure rollers on the drawing frame is 250 meters per minute. The drafting rollers are pre-treated with antistatic agents. In this invention, the final drafting rollers are selected as Shore 80-82 rollers with a surface finish of 0.4-0.8µm. Two coats of JY-II colored AB paint at a 1:4 ratio are applied, and the rollers are allowed to dry in the dark for 48 hours before use. Every 4 hours, the roller surface is cleaned with HD roller and bearing cleaner; no warm water is required. The rollers are used after 15 minutes. Sufficient spare capacity for the drawing sliver rollers must be maintained.

[0023] S4. Roving process: The above-mentioned sliver is produced into roving using an FA468E roving frame. The roving dry weight is 4.5 g / 10 m, the draft ratio is 7.78, the back zone draft ratio is 1.27, the twist coefficient is 70, the roller spacing is 25 mm × 25 mm × 27 mm, the roller diameter is 28.5 mm × 28.5 mm × 28.5 mm, the spindle speed is 600 rpm, and the spacer block is 8.0 mm. The rollers are pre-treated with antistatic agents. In this invention, the spinning rollers are selected with a Shore value of approximately 76, a surface finish of 0.4-0.7 μm, and are coated twice with JY-II colored AB paint at a 1:6 ratio. After drying in the dark for 48 hours, they are put into use. Every 8 hours, the roller surface is cleaned with HD roller and apron cleaner. Every 3 days, the rollers are washed, cleaned, and dried with 43°C warm water, and allowed to recover in the dark for 48 hours before being put into use.

[0024] S5. Spinning process: The aforementioned roving is produced using a DTM129 ring spinning frame with negative pressure focusing to produce 14.6 tex compact spun flame-retardant yarn. The ring spinning frame is equipped with a compact spinning device, specifically the new generation high-efficiency and energy-saving "pulse-focused" compact spinning device manufactured by Wuxi Wanbao Textile Machinery & Electrical Co., Ltd. This device integrates the exhaust channels, achieving energy savings of up to 30% or more compared to traditional negative pressure compact spinning. Ring spinning frame process parameters: Draft ratio of 35.13, back zone draft ratio of 1.148, twist coefficient of 340, roller spacing of 27mm × 40mm, roller diameter of 25mm × 25mm × 25mm, upper pin nip spacing using 3.0mm pressure bar spacers, ring type PG1 / 2-4254, traveler type TPJM1 / 2 ES gc traveler from Jinmao, and front roller speed of 140 rpm.

[0025] S6. Winding process: The above-mentioned yarn bobbin is wound into a cone using an AC338RM automatic winding machine. The automatic winding machine has a speed of 1000 meters / minute and uses an electric cleaning process with 280% neps to reduce neps on the fabric surface. The FD and FL foreign fiber channels are opened (FD channel is used to remove dark fibers from light-colored fibers, and FL channel is used to remove light-colored fibers from dark-colored fibers) to remove obvious neps and short, thick knots.

[0026] Preferably, the relative humidity of the production environment for the opening, carding, drawing, roving, spinning, and winding processes is 55%-60% to ensure that the fibers do not get smudged or tangled, making the process easier.

[0027] This invention relates to a viscose / polyimide / acrylic chlorofiber / aramid / nylon blended flame-retardant yarn. The viscose fiber is used to improve the yarn's moisture absorption; in a fire scene, the human body sweats profusely, and viscose can regain moisture up to 13%, allowing for rapid moisture absorption. Acrylic chlorofiber is used to utilize both its high flame retardancy and its wool-like feel, increasing its skin-friendliness. The use of polyimide and aramid fibers is based on the fact that polyimide fiber has a thermal decomposition temperature of around 600 degrees Celsius, but suffers from high static electricity, excessive bulkiness, and poor spinnability. Aramid fiber, on the other hand, has a thermal decomposition temperature of 300-400 degrees Celsius and better spinnability than polyimide fiber. The combination of the two, utilizing the spinnability of aramid 1313, allows the polyimide to pass through carding smoothly. Nylon fiber increases yarn strength and improves yarn abrasion resistance.

[0028] This invention employs manual separation and mixing of viscose, acrylic fiber, nylon fiber, polyimide fiber, and aramid fiber during the opening process. This is based on the fact that the first three fibers are white, while the latter two are golden yellow and crimson, respectively. If all five fibers were mixed and manually fed into the trough together, the color difference between the fibers on the grasping surface of the cotton-grabbing machine on the opening disc and the fibers at the bottom of the trough would be significant, resulting in uneven mixing. Practice has shown that mixing smaller quantities and fewer types of fibers results in less color difference and more uniform mixing. Therefore, the five fibers with different properties are mixed separately, cured with an antistatic agent, and fed into the trough separately during the opening process to form slivers. These slivers are then blended in three stages. Because the number and type of fibers in the cross-section of the blended slivers are similar, the yarn color is consistent and the flame retardancy is uniform.

[0029] The yarn produced by this invention has a soft hand feel, good moisture absorption and skin-friendly properties, and high flame retardancy, making it suitable for making flame-retardant fabrics for close-fitting wear, thus adding a high-performance flame-retardant textile product to the textile industry.

Claims

1. A manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn, comprising the following steps: S1. Cleaning process: ① First, manually shred the viscose fiber, acrylic fiber, and nylon fiber. Then, manually mix the viscose fiber, acrylic fiber, and nylon fiber in a weight ratio of 7:5:

1. After spraying with an antistatic agent and curing for 24 hours, manually load the mixture into a trough. After passing through the A002A cotton grabber → A035C cotton opening and mixing machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap is produced. ② The polyimide fiber and aramid fiber are manually shredded, and then the polyimide fiber and aramid fiber are manually mixed evenly in a weight ratio of 5:

2. After spraying with an antistatic agent and curing for 24 hours, they are manually loaded into the trough. After passing through the A002A cotton grabber → A035C cotton opening machine → FA106C porcupine cotton opening machine → A045B cotton condenser → A076C single-beater lap machine, a mixed lap 2 is made. Process parameters for the opening and closing process: The carding beater speed of the FA106C porcupine opening machine is 380 rpm, the combined beater speed of the A076C single beater lap forming machine is 780 rpm, the lap forming roller speed is 11 rpm, and the weight of the mixed lap is 330 g / m. S2, Carding process: Two types of mixed laps, lap 1 and lap 2, produced in the opening and closing process, were processed into slivers on an A186D carding machine. The process parameters were as follows: the dry weight of the slivers was 16 grams per 5 meters, the flatness speed of both mixed laps was 168 mm / min, the dust removal knife was level with the machine frame at an angle of 90°, the distance between the cylinder and the movable flatness was 0.23 mm, 0.20 mm, 0.18 mm, 0.18 mm, and 0.20 mm, respectively, and the sliver exit speed was 41 meters per minute. in, The cylinder speed of the mixed spool one of viscose fiber, acrylic fiber, and nylon fiber is 300 rpm, and the licker-in speed is 600 rpm. The cylinder speed of the mixed spool two of polyimide fiber and aramid fiber is 330 rpm, and the licker-in speed is 660 rpm. S3, Drawing process: Three-stage rolling process is adopted: ① Take three strips of each of the two types of raw strips and combine them once to make a first drawing frame; the first drawing frame has a dry weight of 17.5 grams / 5 meters, a total draft ratio of 5.49, and a roller grip distance of 56mm×60mm; the pressure roller linear speed of the drawing frame is 250 meters / minute; the drafting rollers are treated with antistatic agents beforehand. ② Combine six first-stage drawing slivers to obtain a second-stage drawing sliver; the second-stage drawing sliver has a dry weight of 17.5 g / 5 m, a total draft ratio of 6, and a roller grip distance of 54 mm × 58 mm; the pressure roller linear speed of the drawing frame is 250 m / min; the drafting rollers are pre-treated with antistatic agents. ③ Combine six second-pass slivers to obtain cooked slivers. The weight of the cooked slivers is 17.5 grams per 5 meters, the total draw ratio is 6, and the roller grip distance is 53mm × 55mm. The linear speed of the pressure rollers of the drawing machine is 250 meters per minute. The drawing rollers are treated with antistatic agents beforehand. S4. Roving process: The sliver is produced into roving using an FA468E roving frame. The roving dry weight is 4.5 g / 10 m, the draft ratio is 7.78, the back zone draft ratio is 1.27, the twist coefficient is 70, the roller spacing is 25 mm × 25 mm × 27 mm, the roller diameter is 28.5 mm × 28.5 mm × 28.5 mm, the spindle speed is 600 rpm, and the spacer blocks are 8.0 mm. The rollers are pre-treated with antistatic agents. S5. Spinning process: The DTM129 ring spinning machine is used to produce 14.6 tex compact spun flame-retardant yarn. The process parameters are as follows: the draft ratio of the ring spinning machine is 35.13, the back zone draft ratio is 1.148, the twist coefficient is 340, the roller spacing is 27mm×40mm, the roller diameter is 25mm×25mm×25mm, the upper pin nip spacing uses a 3.0 mm pressure bar spacer block, the ring is PG1 / 2-4254, the traveler is Jinmao TPJM1 / 2 ES gc traveler, and the front roller speed is 140 rpm. S6. Winding process: The above-mentioned fine yarn is wound into cones using an AC338RM automatic winding machine. The machine speed is 1000 meters / minute, and the neps are reduced by an electric cleaning process with a 280% nep count. Open the foreign fiber channel function to remove discolored nodules and short, thick sections.

2. The manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn according to claim 1, characterized in that, The blended flame-retardant yarn is made of viscose fiber, polyimide fiber, acrylic fiber, aramid fiber, and nylon fiber. Viscose fiber accounts for 33%-37% of the weight of the blended flame-retardant yarn, polyimide fiber accounts for 23%-27% of the weight of the blended flame-retardant yarn, acrylic fiber accounts for 23%-27% of the weight of the blended flame-retardant yarn, aramid fiber accounts for 8%-12% of the weight of the blended flame-retardant yarn, and nylon fiber accounts for 3%-7% of the weight of the blended flame-retardant yarn. The blended flame-retardant yarn is a compact spun flame-retardant yarn with a yarn count of 14.6 tex.

3. The manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn according to claim 1, characterized in that: The viscose fiber has a specification of 1.7 dtex * 40 mm; the polyimide fiber has a specification of 1.67 dtex * 51 mm; the aramid fiber is aramid 1313 with a specification of 1.5 d * 51 mm; the acrylonitrile fiber has a specification of 2.0 d * 38 mm; and the nylon fiber has a specification of 1.8 d * 38 mm. All of the viscose fiber, polyimide fiber, aramid fiber, acrylonitrile fiber, and nylon fiber are flame-retardant fibers.

4. The manufacturing process for viscose / polyimide / acrylic / aramid / nylon blended flame-retardant yarn according to claim 1, characterized in that: The relative humidity of the production environment for the opening, carding, drawing, roving, spinning, and winding processes is 55%-60%.

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