Production process for combining viscose / flax mixed rotor spinning and filament into plied yarn

Abstract

The invention discloses a production process for combining viscose / flax mixed rotor spinning and filaments into plied yarns, and relates to the technical field of textile production, viscose fibers and flax fibers are mixed and then subjected to blowing, cotton carding and drawing to form mixed fiber strips, rotor spinning is performed to form rotor spinning, the rotor spinning is combined with viscose filaments on a doubling winder, and the rotor spinning and the viscose filaments are combined on a two-for-one twister to form the plied yarns; wherein the content of the viscose is 40%-46%, the content of the linen fibers is 33%-39%, the content of the viscose filaments is 15%-27%, and the specification of the piled yarn formed by combining the viscose / linen mixed rotor spinning and the filaments is viscose / linen / 55 / 4548.9 tex + 120DR. Viscose fibers with excellent hygroscopicity and cohesive force and flax fibers with large fiber rigidity and poor cohesive force are blended, the defect that flax is poor in spinning adaptability is overcome, quality upgrading of common open-end spinning is achieved, the plied yarn is compact in structure, little in hairiness and high in strength, the yarn is strong, moderate, soft, uniform and smooth, and the made fabric is elastic, soft, skin-friendly, sweat-absorbent, antibacterial, wear-resistant, good in breathability and good in breathability. And the air spinning product variety is enriched by the high-quality and high-end rank of summer and autumn clothes.

Description

Technical Field

[0001] This invention relates to the field of textile production technology, specifically to a process for producing viscose / linen blended air-jet spun yarn and filament yarn by combining them into a ply yarn. Background Technology

[0002] As a new type of spinning technology, air-jet spinning has the characteristics of high output, large package size, and short process. Due to the special nature of its coagulation, stripping and twisting processes, air-jet spinning is suitable for spinning mainly pure cotton staple fibers, with coarse pure cotton yarn being the most common product. Fine air-jet spun yarn and blended yarn are less common, limiting the variety of products.

[0003] To break away from the conventional mindset of using traditional cotton fiber scraps as raw materials for air-jet spinning, it is necessary to start by improving yarn count and enhancing the quality of air-jet spun yarns. This involves using differentiated fibers such as hemp and silk as raw materials, and blending viscose and flax fibers to produce air-jet spun yarns. This will allow for the development of various functional yarns, thus upgrading ordinary air-jet spun yarns. Therefore, researching a production process for viscose / flax blended air-jet spun yarns and their synthesis into ply yarns from filaments is particularly important. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention aims to provide a production process for viscose / linen blended air-jet spinning and filament combined into ply yarn. This process involves blending viscose and linen fibers to produce air-jet spinning yarn, which is then combined with filament to produce ply yarn. This overcomes the limitation that air-jet spinning equipment cannot achieve fiber blending and enriches the variety of air-jet spun yarn products.

[0005] To achieve the above-mentioned objectives, the present invention provides a production process for viscose / linen blended air-jet spun yarn and filament plied yarn. The viscose / linen blended air-jet spun yarn and filament plied yarn is produced by mixing viscose fiber and linen fiber, then processing the mixture into a blended fiber sliver through opening, carding, and drawing processes. The sliver is then spun into an air-jet spun yarn, which is then combined with viscose filament on a doubling machine and twisted into a plied yarn on a doubling machine. In the viscose / linen blended air-jet spun yarn and filament-blended ply, the viscose fiber content accounts for 40%-46% of the total weight of the blended ply, the linen fiber content accounts for 33%-39% of the total weight of the blended ply, and the viscose filament content accounts for 15%-27% of the total weight of the blended ply, and the viscose / linen fiber blending ratio is 55 / 45.

[0006] Furthermore, a process for producing viscose / linen blended air-jet spun yarn and filament-to-ply yarn includes the following steps: ① Antistatic softening treatment of flax fiber: Before blending with viscose fiber, the flax fiber raw material is subjected to antistatic softening treatment. Mix wool oil with warm water, spray the wool oil solution onto the flax fiber raw material, and after 12 hours of softening treatment, put the flax fiber and viscose fiber raw materials into a disc in proportion, and loosen and mix them evenly by hand. ② Cleaning process: Following the principle of frequent but light picking and more combing with less fiber loss, the speed of each beater and the spacing of each dust bar are set. The beater blade of the A002D cotton picker extends 2mm beyond the ribs, and the beater speed is set to 750 rpm. The speed of the carding needle beater of the FA106C porcupine cotton opener is set to 380 rpm. The spacing of each set of dust bars under the beaters is reduced to 5mm at the inlet, 7mm in the middle, and 9mm at the outlet to reduce fiber loss. The cotton passes through the A092A double feeder to the A076C single beater lap forming machine. The speed of the three-wing integrated beater is set to 700 rpm, and the weight of the mixed linseed and viscose lap is set to 380 g / m. The lap is uniform and without holes. ③ Carding Process: Following the principles of flexible carding and minimal waste transfer, the card clothing models for the licker-in, cylinder, doffer, and flats are configured as follows: AT5610×056109 for the licker-in, AC2030×01740 for the cylinder, AD4030×02090 for the doffer, and MCB40 for the flats. The distance between the feed plate and the licker-in is increased to 0.65mm, the dust removal knife is installed at a 90-degree angle, and its height is level with or above the machine frame. A small bottom-feed inlet is used. The spacing is enlarged to 9mm, and the five-point spacing between the cylinder and the flat cover is 0.25mm, 0.23mm, 0.23mm, 0.23mm, and 0.25mm respectively, reducing the load on the needle teeth; the flat cover rotates at a low speed to control the amount of blanking on the flat cover; the cylinder / licker-in speed is set at 280 / 560 rpm, the doffer runs at 18 rpm, the sliver dry weight is 22g / 5m, the web tension is appropriate, the web transfer is smooth, there is no return of blanking, no cloudiness, no holes, and the sliver package is well formed; ④ Drawing process: Following the principle of decreasing drafting and straightening parallelism, the first drawing process feeds in 8 raw slivers for drawing and drafting, and the second drawing process feeds in 6 raw slivers for drawing and drafting. The drafting ratio of the first drawing process is greater than that of the second drawing process. The roller spacing of the first drawing process is 16 mm × 26 mm, and the roller spacing of the second drawing process is 14 mm × 24 mm. The quantitative design of the second drawing process is 25 grams / 5m of cooked sliver. The speed of the pressure rollers of the two drawing machines is 250 m / min. ⑤ Air-jet spinning process: The equipment uses domestic Titan air-jet spinning machine, adopting the process principle of larger twist and smaller draft. The pressure applied to the cotton board is 15%-20% greater than when spinning pure cotton, increasing the holding power of the fibers. The process negative pressure is 6000pa-7000pa, and the impurity removal negative pressure is 1500pa-2000pa. The vacuum degree of the spinning cup is increased. The spinning cup uses OK36 type with a diameter of Φ51mm and a spinning cup speed of 60000 rpm. The carding roller is OS21 type with a speed of 7000 rpm. The twist coefficient is set to 460. A grooved twist-resistant disc is used to improve twisting efficiency and reduce yarn breakage. The air-jet spinning machine is cleaned twice per shift, and the carding channel and spinning cup are cleaned to remove dust accumulation. ⑥ Fixed-position twisting process: Purchased viscose 120D filament is twisted: 50 twists / 10cm in the Z-direction is added. The Titan XB318 filament twisting machine is used, equipped with a servo motor and the gear rotates in the opposite direction to add Z twist to the viscose filament. It is then dry-steamed in a steaming pot for 1 hour to fully release the torque. ⑦. Yarn doubling process: The viscose / linen blended air-jet spun yarn and the viscose filament with 50 twists are doubled on the doubling machine. The tension difference between the yarn and the filament is adjusted to make their tension consistent, thereby controlling the production of braided yarn. ⑧ Twisting process: When twisting, there should be no small braids in the yarn by hand or visual inspection. Control the weak twist and poor splicing of the yarn. Use a medium-low speed of 5000 rpm to reduce the phenomenon of exposed viscose filaments. Alternatively, install Uster electro-cleaner under the overfeed roller to cut off the part of the exposed viscose filaments, and then use air twisting or water twisting to remove the splice.

[0007] Furthermore, a process for producing viscose / linen blended air-jet spun yarn and filament yarn by plying, wherein the viscose fiber has a specification of 1.33 dtex × 38 mm and a resistivity of 7.0 × 10⁻⁶. 7 The flax fiber has a length of 27 mm, a breaking strength of 48.5 cN / dtex, a moisture regain of 10.3%, a fineness of 2100 metric count, and a short fiber content of over 23%. The filament is a 120D viscose filament.

[0008] Furthermore, a process for producing viscose / linen blended air-jet spun yarn and filament-blended yarn is provided, wherein the viscose / linen blended air-jet spun yarn is 48.9 tex air-jet spun yarn, and the twist coefficient of the viscose / linen blended air-jet spun yarn and filament-blended yarn is designed to be 410; the specifications of the viscose / linen blended air-jet spun yarn and filament-blended yarn are viscose / linen / 55 / 45 48.9 tex + 120 DR.

[0009] Compared with existing technologies, this invention blends viscose fiber, which has excellent moisture absorption and cohesion, with flax fiber, which has high fiber rigidity and poor cohesion. This improves the poor spinning performance of flax and fully utilizes the moisture absorption, heat dissipation, health-preserving, antibacterial, stain-resistant, and antistatic properties of flax fiber. Before production, the flax raw material is softened and then manually mixed with viscose raw material. Following this, it undergoes opening and carding processes to remove impurities. The fibers are further mixed and straightened in the drawing process. The resulting viscose / flax blended air-jet spun yarn is then produced using an air-jet spinning machine. Finally, it is combined with twisted viscose filaments to form plied yarn, achieving a quality upgrade from ordinary air-jet spun yarn. The viscose / flax blended air-jet spun yarn of this invention, combined with the filaments to form plied yarn, has a compact structure, low hairiness, high strength, and excellent overall performance. The yarn is strong yet soft, uniform and smooth. The fabric produced is elastic and soft, skin-friendly and sweat-absorbent, antibacterial and wear-resistant, and stylish, placing it among the high-end quality summer and autumn clothing and enriching the variety of air-jet spun products. Detailed Implementation

[0010] The specific embodiments of the present invention will be further described in detail below with reference to examples.

[0011] This invention discloses a production process for viscose / linen blended air-jet spun yarn and filament combined into ply yarn. The viscose / linen blended air-jet spun yarn and filament combined into ply yarn is produced by mixing viscose fiber and linen fiber, then making a blended fiber sliver through opening, carding, and drawing processes, making it into an air-jet spun yarn through an air-jet spinning machine, and then combining it with viscose filament on a doubling machine to form ply yarn. In the viscose / linen blended air-jet spun yarn and filament-blended ply, the viscose fiber content accounts for 40%-46% of the total weight of the blended ply, the linen fiber content accounts for 33%-39% of the total weight of the blended ply, and the viscose filament content accounts for 15%-27% of the total weight of the blended ply, and the viscose / linen fiber blending ratio is 55 / 45.

[0012] Preferably, a process for producing viscose / linen blended air-jet spun yarn and filament-to-ply yarn is described, wherein the viscose fiber has a specification of 1.33 dtex × 38 mm and a low resistivity of approximately 7.0 × 10⁻⁶. 7 Ω·cm, moisture regain is about 12.7%, breaking strength is 2.17cN / dtex; viscose fiber has excellent moisture absorption and fiber cohesion, and has good spinnability. When blended with flax fiber, it can greatly improve the spinnability of flax.

[0013] The flax fiber has an average length of about 27mm, a breaking strength of 48.5cN / dtex, a moisture regain of 10.3%, a fineness of about 2100 metric count, and a short fiber content of over 23%. Flax fiber has the characteristics of moisture absorption and heat dissipation, health care and antibacterial properties, stain resistance and antistatic properties. Its pure or blended fabrics have a wide range of uses, from shirt fabrics to decorative fabrics and industrial special fabrics. As a natural fiber, its fiber rigidity is relatively high and its cohesion is relatively poor. Its spinning performance is poor when produced alone, and during the carding process, slightly shorter fibers are easy to fall off, making it difficult to form a web or strip. However, when blended with other fibers in a certain proportion, its spinning performance can be greatly improved, and the blended fabrics are more high-end and unique.

[0014] The filament is 120D viscose filament; 120D viscose filament is a common filament produced from cotton or other natural fibers. It has the general characteristics of viscose fiber. Its high strength and abrasion resistance are used in clothing fabrics. It has the characteristics of being smooth and cool, breathable, antistatic, and having bright dyeing properties. After being twisted with viscose / linen air-jet spun yarn, the yarn straightness can be improved and the strength can be significantly increased, making the fabric more widely used.

[0015] Preferably, a process for producing viscose / linen blended air-jet spun yarn and filament-blended yarn is provided, wherein the viscose / linen blended air-jet spun yarn is 48.9 tex air-jet spun yarn, and the twist coefficient of the viscose / linen blended air-jet spun yarn and filament-blended yarn is designed to be 410; the specification of the viscose / linen blended air-jet spun yarn and filament-blended yarn is viscose / linen / 55 / 45 48.9 tex + 120 DR.

[0016] The viscose / linen blended air-jet spun yarn and filament-stretched ply yarn of the present invention can be any of the groups in the embodiments in Table 1: Table 1

[0017] Preferably, a process for producing viscose / linen blended air-jet spun yarn and filament-to-ply yarn mainly includes the following steps: ① Antistatic softening treatment of flax fiber: Flax fiber has poor uniformity, high rigidity, and contains a lot of short fibers. When it is opened and combed alone, the fiber loss increases after being hit, and the fiber cohesion is poor, making it difficult to form a web or sliver. Therefore, before blending with viscose fiber, the flax fiber raw material must be treated with antistatic softening. Mix 2% of the flax fiber input with warm water and spray the mixture evenly onto the flax fiber. After 12 hours of softening treatment, put the flax fiber and viscose fiber raw materials into the disc of the A002D cotton grabber in proportion, and loosen and mix them evenly by hand. Considering that the flax fiber has a high short fiber content, the loss during the opening and combing process will be greater. When feeding the material, the amount of flax fiber can be increased by 2%-3% to ensure the mixing ratio of the two fibers.

[0018] ② Cleaning Process: Considering the characteristics of viscose and flax fibers and the special nature of manual mixing, the process follows the principle of frequent but light handling and more combing to minimize fiber loss. The speed of each main beater and the spacing of each main dust bar are set accordingly. The beater blade of the A002D cotton-grabbing machine extends 2mm beyond the ribs, and the beater speed is set to 750 rpm. The speed of the carding beater of the FA106C porcupine cotton opener is set to 380 rpm to further loosen the raw material and reduce fiber damage. The spacing of each set of dust bars under the beaters is appropriately reduced to 5mm at the inlet, 7mm in the middle, and 9mm at the outlet to reduce fiber loss. The fibers then pass through the A092A double-feeder to the A076C single-beater lap forming machine. The speed of the three-wing integrated beater is set to 700 rpm, and the weight of the viscose-flax mixed lap is set to 380 g / m. The lap must be uniform, without holes, tight, and not bulging, and then wrapped in plastic wrap.

[0019] ③ Carding process: In accordance with the process principle of flexible carding and less fiber loss and more transfer, the card clothing models of licker-in roller, cylinder, doffer, and flat cover are configured. Considering the long-term use and versatility of the card clothing, in order to ensure effective carding and sliver formation of lint, the licker-in roller is selected as AT5610×056109, the cylinder card clothing is selected as AC2030×01740, the doffer card clothing is selected as AD4030×02090, and the flat cover card clothing is selected as MCB40. The selection of these card clothing makes the fiber carding gentle, the transfer smooth, and the needle teeth should not be blocked by short fibers. Then, determine the carding speed of the licker-in cylinder and the carding spacing at each point. After the two fiber raw materials are mixed during cleaning, the entanglement and cohesion between the fibers are improved to a certain extent. In order to fully card without excessively damaging the fibers and increasing the amount of short fibers, the spacing between the feed plate and the licker-in cylinder is appropriately increased to 0.65mm in the main spacing, the dust removal knife is installed at a 90-degree angle and is level with the machine frame or above, the spacing at the small bottom inlet is increased to 9mm, and the 5-point spacing between the cylinder and the top plate is generally larger than when spinning pure cotton. The five-point spacing should be large, namely 0.25mm, 0.23mm, 0.23mm, 0.23mm, and 0.25mm respectively, to reduce the load of needle tooth clogging; the cover plate should rotate at a low speed to control the amount of cover plate blemishes; the cylinder / licker-in speed should be set at 280 / 560 rpm, the doffer should run at 18 rpm, the sliver dry weight should be 22 grams / 5m, and the cotton web tension should be appropriate to ensure smooth cotton web transfer, no blemishes, no cloudiness, no holes, and good sliver package formation.

[0020] ④ Drawing process: Following the principle of decreasing drafting and straightening parallelism, two drafting stages are designed. The first drawing stage feeds in 8 slivers for combined drafting, and the second drawing stage feeds in 6 slivers for combined drafting. The drafting ratio of the back zone is greater for the first drawing stage than for the second drawing stage. The spacing between the first and second main drafting stages is set in a decreasing manner. Considering that flax fibers contain some long fibers of about 50mm, the roller spacing for the first drawing stage is 16mm×26mm, and the roller spacing for the second drawing stage is 14mm×24mm to ensure smooth and stable fiber drafting. The sliver weight for the second drawing stage is designed to be 25g / 5m. The speed (pressure roller) of the two drawing frames is 250m / min. Care should be taken to prevent the leather rollers from carrying slivers.

[0021] ⑤ Air-jet spinning process: The equipment used is the domestic Titan air-jet spinning machine, which adopts the process principle of large twist and small draw. The hemp fiber is coarse and hard, with high rigidity and high modulus. The coefficient of friction with metal is small. The pressure applied to the cotton board is 15%-20% greater than when spinning pure cotton, which increases the holding of the fiber. The process negative pressure is 6000pa-7000pa, and the impurity removal negative pressure is 1500pa-2000pa. Considering that viscose and flax fibers are longer than common waste cotton, ground cotton, and spun cotton used in air-jet spinning, the vacuum degree of the spinning cup needs to be increased to prevent fiber accumulation. OK36 type spinning cups with a diameter of Φ51mm are used, with a spinning speed of 60,000 rpm. OS21 type carding rollers are used with a speed of 7,000 rpm to facilitate fiber transfer and reduce slub yarn defects. The twist coefficient is set to 460, and a grooved twist-resistant disc is used to improve twisting efficiency and reduce yarn breakage. The resulting blended yarn is soft yet strong, with excellent evenness. The air-jet spinning process is cleaned twice per shift to ensure the carding channel and spinning cup are clean, free of dust and lint.

[0022] ⑥ Fixed-position twisting process: Purchased 120D viscose filament is twisted in the Z direction: the twist is 50 twists / 10cm. A Titan XB318 filament doubling machine is used. The equipment is modified by removing some transmission gears and installing a servo motor. Because the filament doubling machine, like the staple fiber doubling machine, adds an S twist, while the air-jet spun blended yarn is a Z twist, and the 120D viscose filament needs to be doubled to create an S twist, adding an S twist on top of an S twist will increase the torque of the viscose filament, resulting in different elongation between the twisted yarn and the viscose / linen blended yarn. To avoid the formation of small braids from unidirectional twisting, the servo motor needs to be modified to rotate the gears in the opposite direction when twisting the 120D viscose filament, adding a Z twist to the filament. Then, it is dry-steamed in a steamer (set to 85 degrees Celsius) for 1 hour to fully release the torque. Fixed-position twisting of 120D viscose filament is a key factor in producing good plied yarn.

[0023] ⑦. Yarn doubling process: The viscose / linen blended air-jet spun yarn and the viscose filament with 50 twists are doubled on the doubling machine. The tension difference between the yarn and the filament is adjusted to make their tension consistent in order to control the generation of small braided yarn.

[0024] ⑧ Twisting process: When twisting, there should be no small braids in the yarn by hand or visual inspection. Weak twisting and poor splicing should be controlled. Because viscose / linen blended air-jet spun yarn contains inconspicuous slubs, the twist is small and the strength is low at the slub. It is easy to break after scraping, resulting in exposed viscose filaments in some sections of the twisted yarn. Therefore, a medium-low speed of 5000 rpm is used to reduce the exposure of viscose filaments. Alternatively, the equipment can be modified by adding an Uster electro-cleaner under the overfeed roller to cut off the exposed viscose filaments, and then using air twisting or water twisting to remove the splices.

[0025] The cotton spinning equipment used in this invention are all commonly used general equipment in cotton textile manufacturing, and the equipment selection is highly adaptable. The process parameters in each process are determined according to the fiber characteristics of the selected yarn count, yarn weight, and the model of each piece of equipment, etc., to facilitate operation. To ensure the normal production of viscose / linen 55 / 45 48.9tex+120DR50 twisted yarn, the corresponding equipment configuration and process flow for each process are as follows: Viscose + linen blended air-jet spinning: A002D cotton grabber - FA106C porcupine cotton opener - A045B cotton condenser - A092A double box cotton feeder - A076C single beater lap machine - A186D carding machine - FA317 drawing frame (two passes) - TQF268 air-jet spinning; 120D viscose filament is twisted by an XB318 filament doubling twister (50 twists / 10cm). Viscose / linen air-jet spun blended yarn + 120D (R50 twist) - RF231B doubling machine - RF321B twisting machine.

[0026] Table 2 below shows the test data for producing viscose / linen 55 / 4548.9tex+120DR50 twisted yarn using the process of this invention.

[0027] Table 2:

[0028] This invention addresses the unique properties of viscose and flax fibers. Before production, the flax raw material is softened and then manually mixed with viscose raw material. The mixture undergoes opening and carding processes to remove impurities. The fibers are further mixed and straightened during the drawing process, and then spun into a viscose / flax blended air-jet yarn using an air-jet spinning machine. This yarn is then combined with specially treated viscose filaments to form plied yarn, primarily used for summer and autumn fabrics. The resulting blended yarn fabric is characterized by its sweat-wicking, breathability, antibacterial properties, and wrinkle resistance. Its tightly packed plied yarn structure is soft to the touch, with minimal hairiness and high yarn strength. The plied yarn fully meets the quality requirements for autumn and winter clothing fabrics, offering both elasticity and softness, a sophisticated look, and a more high-end feel, thus achieving a quality upgrade from ordinary air-jet spun yarn.

Claims

1. A process for producing viscose / linen blended air-jet spun yarn and filament-to-ply yarn, characterized in that, The viscose / linen blended air-jet spun yarn and filament plied yarn are made by mixing viscose fiber and linen fiber, then processing the blended fiber sliver through opening, carding, and drawing processes, then spinning it into air-jet spun yarn, and finally combining it with viscose filament on a doubling machine to form plied yarn on a twisting machine. In the viscose / linen blended air-jet spun yarn and filament-blended ply, the viscose fiber content accounts for 40%-46% of the total weight of the blended ply, the linen fiber content accounts for 33%-39% of the total weight of the blended ply, and the viscose filament content accounts for 15%-27% of the total weight of the blended ply, and the viscose / linen fiber blending ratio is 55 / 45.

2. The production process of viscose / linen blended air-jet spun yarn and filament combined with ply yarn according to claim 1, characterized in that, Includes the following steps: ① Antistatic softening treatment of flax fiber: Before blending with viscose fiber, the flax fiber raw material is subjected to antistatic softening treatment. Mix wool oil with warm water, spray the wool oil solution onto the flax fiber raw material, and after 12 hours of softening treatment, put the flax fiber and viscose fiber raw materials into a disc in proportion, and loosen and mix them evenly by hand. ② Cleaning process: Following the principle of frequent but light picking and more combing with less fiber loss, the speed of each beater and the spacing of each dust bar are set. The beater blade of the A002D cotton picker extends 2mm beyond the ribs, and the beater speed is set to 750 rpm. The speed of the carding needle beater of the FA106C porcupine cotton opener is set to 380 rpm. The spacing of each set of dust bars under the beaters is reduced to 5mm at the inlet, 7mm in the middle, and 9mm at the outlet to reduce fiber loss. The cotton passes through the A092A double feeder to the A076C single beater lap forming machine. The speed of the three-wing integrated beater is set to 700 rpm, and the weight of the mixed linseed and viscose lap is set to 380 g / m. The lap is uniform and without holes. ③ Carding Process: Following the principles of flexible carding and minimal waste transfer, the card clothing models for the licker-in, cylinder, doffer, and flats are configured as follows: AT5610×056109 for the licker-in, AC2030×01740 for the cylinder, AD4030×02090 for the doffer, and MCB40 for the flats. The distance between the feed plate and the licker-in is increased to 0.65mm, the dust removal knife is installed at a 90-degree angle, and its height is level with or above the machine frame. A small bottom-feed inlet is used. The spacing is enlarged to 9mm, and the five-point spacing between the cylinder and the flat cover is 0.25mm, 0.23mm, 0.23mm, 0.23mm, and 0.25mm respectively, reducing the load on the needle teeth; the flat cover rotates at a low speed to control the amount of blanking on the flat cover; the cylinder / licker-in speed is set at 280 / 560 rpm, the doffer runs at 18 rpm, the sliver dry weight is 22g / 5m, the web tension is appropriate, the web transfer is smooth, there is no return of blanking, no cloudiness, no holes, and the sliver package is well formed; ④ Drawing process: Following the principle of decreasing drafting and straightening parallelism, the first drawing process feeds in 8 raw slivers for drawing and drafting, and the second drawing process feeds in 6 raw slivers for drawing and drafting. The drafting ratio of the first drawing process is greater than that of the second drawing process. The roller spacing of the first drawing process is 16 mm × 26 mm, and the roller spacing of the second drawing process is 14 mm × 24 mm. The quantitative design of the second drawing process is 25 grams / 5m of cooked sliver. The speed of the pressure rollers of the two drawing machines is 250 m / min. ⑤ Air-jet spinning process: The equipment used is the domestically produced Titan air-jet spinning machine, which adopts the process principle of larger twist and smaller draft. The pressure applied to the cotton board is 15%-20% greater than when spinning pure cotton, which increases the holding power of the fibers. The process negative pressure is 6000pa-7000pa, and the impurity removal negative pressure is 1500pa-2000pa. ； Increase the vacuum of the spinning cup, use OK36 type spinning cup with a diameter of Φ51mm, spinneret speed of 60,000 rpm, and OS21 type carding roller with a speed of 7,000 rpm; set the twist coefficient to 460, and use grooved twist-resistant disc to improve twisting efficiency and reduce yarn breakage; clean the airflow spinning twice per shift, cleaning the carding channel and spinning cup to prevent dust accumulation; ⑥ Fixed-position twisting process: Purchased viscose 120D filament is twisted: 50 twists / 10cm in the Z-direction is added. The Titan XB318 filament twisting machine is used, equipped with a servo motor and the gear rotates in the opposite direction to add Z twist to the viscose filament. It is then dry-steamed in a steaming pot for 1 hour to fully release the torque. ⑦. Yarn doubling process: The viscose / linen blended air-jet spun yarn and the viscose filament with 50 twists are doubled on the doubling machine. The tension difference between the yarn and the filament is adjusted to make their tension consistent, thereby controlling the production of braided yarn. ⑧ Twisting process: When twisting, there should be no small braids in the yarn by hand or visual inspection. Control the weak twist and poor splicing of the yarn. Use a medium-low speed of 5000 rpm to reduce the phenomenon of exposed viscose filaments. Alternatively, install Uster electro-cleaner under the overfeed roller to cut off the part of the exposed viscose filaments, and then use air twisting or water twisting to remove the splice.

3. The production process of viscose / linen blended air-jet spun yarn and filament combined with ply yarn according to claim 1, characterized in that, The viscose fiber has a specification of 1.33 dtex × 38 mm, a resistivity of 7.0 × 10⁷ Ω·cm, a moisture regain of 12.7%, and a breaking strength of 2.17 cN / dtex; the flax fiber has a length of 27 mm, a breaking strength of 48.5 cN / dtex, a moisture regain of 10.3%, a fineness of 2100 metric count, and a short fiber content of over 23%; the viscose filament is a 120D viscose filament.

4. The production process of viscose / linen blended air-jet spun yarn and filament combined with ply yarn according to claim 1, characterized in that, The viscose / linen blended air-jet spun yarn is 48.9 tex air-jet spun yarn, and the twist coefficient of the viscose / linen blended air-jet spun yarn and the filament-blended yarn is designed to be 410; the specification of the viscose / linen blended air-jet spun yarn and the filament-blended yarn is viscose / linen / 55 / 45 48.9 tex + 120 DR.

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