A method of producing a composite yarn

Abstract

The application discloses a production method of composite yarn, characterized in that the method comprises the following steps: (1) raw material selection; (2) carding; (3) pre-drawing; (4) drawing; (5) first roving; (6) first spinning; (7) second roving; and (8) second spinning. The application adopts a double-wrapping mode in the roving process to obtain a wrapped composite roving, so that, in the spinning process, on one hand, the stable drafting of the short fiber roving in the wrapped composite roving is realized under the control of the outer wrapping yarn, thereby improving the drafting effect; on the other hand, the penetration of the stretched outer wrapping yarn into the drafted short fiber sliver is realized, thereby obtaining a core-sheath composite yarn with excellent wrapping effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new yarns, in particular to a production method of composite yarns. BACKGROUND

[0002] With the development of social economy, people's living standards are constantly improving. In addition to pursuing comfort, people are increasingly concerned about the fashion and functionality of clothing textiles, and are pursuing unique styles and various functions such as antibacterial and antistatic functions. In order to meet the needs of consumers, it is an important task for the textile industry to constantly explore new yarns and fabrics. With the development of science and technology, the competition in the textile market is becoming increasingly fierce. In order to maximize profits, manufacturers are constantly developing towards high-end, high-grade, good technology content, and high value-added.

[0003] Composite yarns made of filaments and staple fibers have gradually attracted attention. Such yarns effectively combine filaments and staple yarns, thereby effectively improving the overall performance of the yarn. Currently, composite yarns made of filaments and staple yarns generally include wrapped yarns formed by wrapping filaments on the outside of staple yarns and core-spun yarns formed by wrapping filaments on the inside of staple yarns. In the production of these two types of yarns, the staple sliver output by the drafting system of the spinning frame and the filaments are combined by twisting. The final composite yarn is produced by wrapping the filaments around the staple sliver or wrapping the staple sliver around the filaments during the twisting process. That is, the filaments do not participate in the drafting process of the staple fibers, and therefore, the effectiveness of the filaments in drafting the staple fibers cannot be fully utilized. SUMMARY

[0004] The present application aims to provide a production method of composite yarns to solve the problem that filaments cannot exert a drafting effect on staple fibers during composite spinning.

[0005] The present application provides a production method of composite yarns, comprising the following steps:

[0006] (1) Raw material selection: using single-mass raw materials such as polyester and viscose fibers, adding T / R roving slivers and T / R mixed slivers;

[0007] (2) Carding combination: the selected polyester fibers are sequentially grabbed by JWF1012 type reciprocating grabber with TF27 type bridge magnet according to the required mixing ratio, and the metal impurities in the grabbed polyester fibers are separated and removed by the bridge magnet. The bulk impurities in the grabbed polyester fibers are separated and removed by JWF0001 type multifunctional separator. The polyester fibers are conveyed to JWF1026-120 type multi-bin blending machine by the negative pressure airflow generated by ZF9104 type air blower. The polyester fibers are randomly fed into different high-type cotton bins in the multi-bin blending machine to achieve mixing. The polyester fibers in each cotton bin are recombined after being conveyed by different distance paths. The polyester fibers are further opened and decontaminated by JWF1124D-120 type cleaner with TF34 type iron suction device to produce polyester fiber tufts. The polyester fiber tufts are conveyed to JWF1204A type carding machine by the conveying pipeline driven by FA051A type condensing device + TF26A type overhead device + ZF9104 type air blower to produce polyester slivers. The polyester slivers are continuously wound in the sliver cans by TF2513 type winder;

[0008] The selected viscose fibers are sequentially grabbed by FA002 type automatic grabber according to the required mixing ratio. The metal and bulk impurities in the grabbed viscose fibers are separated and removed by FA121 metal impurity removal device. The viscose fibers are randomly fed into different high-type cotton bins in the multi-bin blending machine to achieve mixing. The viscose fibers in each cotton bin are recombined after being randomly output by the cotton bins at different times. The viscose fibers are continuously conveyed to the opener by the conveying pipeline by the adsorption of the condensing device in the FA106A carding needle beater opener with A045B condensing device. After being distributed by A062 electric cotton distributor, the viscose fibers are continuously conveyed to the cotton feeder by the adsorption of the condensing device in the A092AST double cotton box cotton feeder with A045B condensing device, and are uniformly layered by the viscose fibers. The uniformly layered viscose fiber layer is then conveyed to the FA141 lap former, where it is opened, decontaminated, and leveled to produce a uniform viscose lap. The viscose lap is fed into the JWF1204A type carding machine to produce viscose slivers. The produced viscose slivers are continuously wound in the sliver cans by TF2513 type winder;

[0009] (3) Pre-drawing: the viscose slivers produced in step (2) are pre-drawing to improve the evenness of the slivers and adjust the linear density. Seven viscose slivers are fed together. The seven viscose slivers are drawn and thinned by the drafting system of the drawing frame, and are recombined after being drawn and thinned.

[0010] The polyester sliver prepared in step (2) is subjected to pre-drawing to improve the evenness and adjust the linear density of the polyester pre-drawing sliver, 7 polyester slivers are fed together, and the 7 polyester slivers are drawn and thinned by the drawing system of the drawing frame, and then the drawn and thinned polyester slivers are combined again;

[0011] (4) Drawing: the viscose pre-drawing sliver and the polyester pre-drawing sliver prepared in step (3) are drawn together by three drawing processes to prepare a polyester-viscose drawing sliver, 8 viscose pre-drawing slivers and polyester pre-drawing slivers are fed together in the first drawing process, the number of the viscose pre-drawing slivers and the polyester pre-drawing slivers is determined according to the blending ratio of the polyester fiber and the viscose fiber in the blended yarn and the linear density of the prepared viscose pre-drawing sliver and the polyester pre-drawing sliver, the 8 viscose pre-drawing slivers and the polyester pre-drawing slivers are drawn and thinned by the drawing system of the drawing frame, and then combined again to prepare a polyester-viscose mixed sliver;

[0012] 8 polyester-viscose mixed slivers are fed in the second drawing process, the 8 polyester-viscose mixed slivers are drawn and thinned by the drawing system of the drawing frame, and then combined again to prepare a polyester-viscose semi-drawing sliver;

[0013] 8 polyester-viscose semi-drawing slivers are fed in the third drawing process, the 8 polyester-viscose semi-drawing slivers are drawn and thinned by the drawing system of the drawing frame, and then combined again to prepare a polyester-viscose drawing sliver;

[0014] In the drawing process, the speed of the compression roller in the first drawing process and the second drawing process is slightly greater than the speed of the compression roller in the third drawing process;

[0015] (5) First roving: the polyester-viscose drawing sliver prepared in step (4) is drawn by the drawing system of the first roving and is twisted and wound by the twisting system to prepare a first polyester-viscose roving with a certain strength;

[0016] (6) First spinning: the first polyester-viscose roving prepared in step (5) is drawn by the drawing system of the first spinning and is twisted and wound by the twisting system to prepare a first polyester-viscose spun yarn with a certain strength;

[0017] (7) the second roving: the spun polyester-viscose sliver prepared in step (4) and the two first polyester-viscose yarns prepared in step (6) are collectively subjected to a second roving process to prepare a polyester-viscose composite roving. The roving machine comprises a drafting system and a twisting system. The spun polyester-viscose sliver is pressed by the back roller of the drafting system and then enters the drafting system. After the drafting action of the drafting system, the spun polyester-viscose sliver is obtained. The prepared spun polyester-viscose sliver is continuously and actively output by the front roller of the drafting system. One first polyester-viscose yarn is output by the front roller of the drafting system, and the pressing point is located on the left side of the spun polyester-viscose sliver. Another first polyester-viscose yarn is output by the front roller of the drafting system, and the pressing point is located on the right side of the spun polyester-viscose sliver. The distance between the first polyester-viscose yarn on the left side and the spun polyester-viscose sliver is equal to the distance between the first polyester-viscose yarn on the right side and the spun polyester-viscose sliver. The spun polyester-viscose sliver and the two first polyester-viscose yarns actively output by the front roller are subjected to the action of the twisting degree generated by the twisting system of the roving machine. The fibers in the spun polyester-viscose sliver are transferred to each other, so that a certain holding force is generated between the fibers, and then a polyester-viscose core roving with a certain strength is obtained. The first polyester-viscose yarn on the left side of the spun polyester-viscose sliver is wrapped on the polyester-viscose core roving from left to right, and the first polyester-viscose yarn on the right side of the spun polyester-viscose sliver is wrapped on the polyester-viscose core roving from right to left, and then a polyester-viscose composite roving is obtained. The wrapping pitch of the two first polyester-viscose yarns on the polyester-viscose core roving is determined by the twisting degree of the roving machine and the distance between the first polyester-viscose yarn and the spun polyester-viscose sliver.

[0018] (8) Second spinning: the polyester-viscose composite roving prepared in step (7) is subjected to a second spinning process to prepare a core-spun composite yarn, the spinning machine comprises a drafting system and a twisting system, the polyester-viscose composite roving is pressed by the back roller of the drafting system and then enters the drafting system, under the drafting action of the drafting system, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion, and during the change, the two first polyester-viscose yarns in the polyester-viscose composite roving tightly wrap the polyester-viscose core roving, so that the fibers in the polyester-viscose core roving are tightly wrapped by the two first polyester-viscose yarns, thereby forming a stable first friction field between the fibers in the polyester-viscose core roving, and a stable second friction field between the fibers outside the polyester-viscose core roving, under the comprehensive control of the first and second friction fields, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion, thereby preparing a polyester-viscose sliver with excellent fiber distribution consistency through the drafting system, at the same time, under the drafting action of the back zone of the drafting system, the polyester-viscose composite roving partially loses twist, thereby making the two first polyester-viscose yarns wrapped gradually change from the wrapped state to the curved non-wrapped state, under the drafting action of the front zone of the drafting system, the two first polyester-viscose yarns in the curved state are stretched from the curved state to the straightened state, and after being straightened, continue to be stretched, thereby a certain tensile elongation occurs, but the two first polyester-viscose yarns are not broken, the two first polyester-viscose yarns are thus subjected to a certain tension, under the action of the tension, the two first polyester-viscose yarns continuously penetrate into the interior of the polyester-viscose sliver, and are output together with the polyester-viscose sliver by the driving action of the front roller of the drafting system, the output polyester-viscose sliver with the penetrated first polyester-viscose yarns is covered with a cover yarn under the action of the twisting twist, and in the twisting process, the two first polyester-viscose yarns further wrapped in the center, thereby obtaining the required core-spun composite yarn.

[0019] Compared with the prior art, the invention is characterized in that: the slubbing of polyester and viscose after drawing and mixing is fed into the back roller of the drawing system of the roving frame in the second roving process, and the slubbing is obtained after drawing and is output by the front roller of the drawing system; one first fine yarn of polyester and viscose is pressed and output by the front roller of the drawing system, and the pressing point is located on the left side of the slubbing; the other first fine yarn of polyester and viscose is pressed and output by the front roller of the drawing system, and the pressing point is located on the right side of the slubbing; under the action of twisting, the slubbing is directly twisted to obtain the roving of polyester and viscose, and the two first fine yarns of polyester and viscose are wrapped on the outside of the roving from left to right and from right to left respectively, so as to obtain the composite roving of polyester and viscose; in the second spinning process, the composite roving of polyester and viscose obtained is fed into the back roller of the spinning frame, and in the drawing system, on the one hand, the roving of polyester and viscose inside the composite roving of polyester and viscose is stretched and thinned, and in the stretching process, the fibers in the roving of polyester and viscose realize stable and concentrated speed change under the control of the first fine yarn of polyester and viscose wrapped outside to obtain the slubbing, the two first fine yarns of polyester and viscose wrapped outside the composite roving of polyester and viscose are straightened and infiltrate into the slubbing with a certain tension, and the output slubbing infiltrated with the first fine yarn of polyester and viscose obtains the overwrap yarn under the action of twisting twist, and the first fine yarn of polyester and viscose further wrapped in the center during the twisting process, so as to obtain the required core-spun composite fine yarn. The patent obtains the wrapped composite roving by adopting the double wrapping method in the roving process, so as to realize the stable drawing of the short fiber roving in the wrapped composite roving under the control of the overwrapped yarn in the spinning process, so as to improve the drawing effect, and on the other hand, the overwrapped yarn after drawing infiltrates into the short fiber slubbing after drawing, so as to obtain the core-spun composite fine yarn with excellent wrapping effect. DETAILED DESCRIPTION

[0020] The application provides a production method of composite yarn, and the method comprises the following steps:

[0021] (1) raw material selection: in order to prevent the fluctuation of fiber whiteness and dyeing performance, the polyester and viscose fibers are all single brand raw materials, so as to avoid the generation of yellow and white yarns or cloth surface horizontal bars, wherein the viscose fiber is selected to be the environment-friendly viscose of Lanjing, so as to improve the added value of the product, the polyester fiber is selected to be the polyester of Yizheng, and a small amount of T / R roving and T / R mixed sliver are added in order to save raw materials;

[0022] (2) carding connection: the selected polyester fibers are sequentially grabbed by JWF1012 type reciprocating grabber with TF27 type bridge magnet according to the required mixing ratio, and the initial opening of the polyester fibers is realized during the grabbing process. Meanwhile, the metal impurities in the grabbed polyester fibers are separated and removed by the bridge magnet. The blocky impurities in the grabbed polyester fibers are separated and removed by JWF0001 type multifunctional separator. The grabbed polyester fibers are conveyed to JWF1026-120 type multi-bin mixing cotton machine by the negative pressure airflow generated by ZF9104 type air blower. The polyester fibers conveyed are randomly dropped into different high-type cotton bins of the multi-bin mixing cotton machine to realize feeding and mixing. The polyester fibers in each cotton bin are recombined after being output from the cotton bin and conveyed through different distance paths to realize output mixing. The opening and impurity removal of the polyester fibers are realized during the conveying process. The polyester fibers are further opened and decontaminated by JWF1124D-120 type cleaner with TF34 type iron suction device, so as to prepare polyester fiber tufts. The prepared polyester fiber tufts are conveyed to JWF1204A type carding machine by the conveying pipeline driven by FA051A type condensing device + TF26A type overhead device + ZF9104 type air blower. The deep and meticulous opening, carding, impurity removal and slivering of the polyester fibers are realized in the conveying machine, so as to prepare polyester sliver. The prepared polyester sliver is continuously wound in the sliver can by TF2513 type sliver winder.

[0023] The selected viscose fibers are sequentially grabbed by FA002 type automatic grabber according to the required mixing ratio. The initial opening and mixing of the viscose fibers are realized during the grabbing process. The metal and blocky impurities in the grabbed viscose fibers are separated and removed by FA121 metal impurity removal device. The viscose fibers conveyed are randomly dropped into different high-type cotton bins of the multi-bin mixing cotton machine to realize feeding and mixing. The viscose fibers in each cotton bin are recombined after being output from the cotton bin at different random times to realize output mixing. The opening and impurity removal of the viscose fibers are realized during the conveying process. The viscose fibers are continuously conveyed to the opening machine from the conveying pipeline by the adsorption of the condensing device of the FA106A carding needle beater opening machine with A045B condensing device. The further opening and decontamination of the viscose fibers are realized in the opening cleaner. After being distributed by A062 electric cotton distributor, the viscose fibers are continuously conveyed to the cotton feeder from the conveying pipeline by the adsorption of the condensing device of the A092AST double cotton box cotton feeder with A045B condensing device. The opening and decontamination of the viscose fibers are realized in the cotton feeder, and the viscose fibers are uniformly layered. The uniformly layered viscose fiber layer is then conveyed to FA141 lap former. The opening, decontamination and uniformity of the viscose fibers are realized in the lap former, so as to prepare uniform viscose lap. The viscose lap is fed into JWF1204A type carding machine. The deep and meticulous opening, carding, decontamination and slivering of the viscose fibers are realized in the conveying machine, so as to prepare polyester sliver. The prepared polyester sliver is continuously wound in the sliver can by TF2513 type sliver winder.

[0024] (3) Pre-ribboning: the viscose carded sliver prepared in step (2) is pre-ribboned to prepare a viscose pre-ribbon with improved evenness and adjusted linear density, 7 viscose carded slivers are fed together, the 7 viscose carded slivers are drawn and attenuated by the drafting system of the ribboner, in the process of drawing and attenuating, on the one hand, the fibers in the carded sliver are straightened, thereby improving the fiber straightness of the prepared viscose pre-ribbon, on the other hand, the linear density of the prepared viscose pre-ribbon is adjusted by drafting, thereby laying a foundation for realizing the accurate blending ratio of the two fibers in the subsequent ribboning, the viscose carded sliver after drawing and attenuating is recombined, in the process of recombination, the evenness is improved by the random combination of thick places, thin places and normal sections in the carded sliver;

[0025] The polyester carded sliver prepared in step (2) is pre-ribboned to prepare a polyester pre-ribbon with improved evenness and adjusted linear density, 7 polyester carded slivers are fed together, the 7 polyester carded slivers are drawn and attenuated by the drafting system of the ribboner, in the process of drawing and attenuating, on the one hand, the fibers in the carded sliver are straightened, thereby improving the fiber straightness of the prepared polyester pre-ribbon, on the other hand, the linear density of the prepared polyester pre-ribbon is adjusted by drafting, thereby laying a foundation for realizing the accurate blending ratio of the two fibers in the subsequent ribboning, the polyester carded sliver after drawing and attenuating is recombined, in the process of recombination, the evenness is improved by the random combination of thick places, thin places and normal sections in the carded sliver;

[0026] (4) Ribboning: the viscose pre-ribbon and the polyester pre-ribbon prepared in step (3) are ribboned together in three passes to prepare a polyester-viscose mature sliver, in the first pass, a total of 8 viscose pre-ribbons and polyester pre-ribbons are fed together, the number of viscose pre-ribbons and polyester pre-ribbons is determined according to the blending ratio of polyester fibers and viscose fibers in the blended yarn and the linear density of the prepared viscose pre-ribbon and polyester pre-ribbon, after the 8 viscose pre-ribbons and polyester pre-ribbons are drawn and attenuated by the drafting system of the ribboner, they are recombined to prepare a polyester-viscose mixed sliver, thereby realizing the mixing of polyester fibers and viscose fibers, in the second pass, a total of 8 polyester-viscose mixed slivers are fed, after the 8 polyester-viscose mixed slivers are drawn and attenuated by the drafting system of the ribboner, they are recombined to prepare a polyester-viscose semi-mature sliver, thereby realizing the more uniform and fine mixing of polyester fibers and viscose fibers, in the third pass, a total of 8 polyester-viscose semi-mature slivers are fed, after the 8 polyester-viscose semi-mature slivers are drawn and attenuated by the drafting system of the ribboner, they are recombined to prepare a polyester-viscose mature sliver, thereby realizing the more uniform and fine mixing of polyester fibers and viscose fibers; in the process of ribboning, the output speed of the press roller is prone to static electricity due to the nature of polyester and viscose, therefore, the output speed of the press roller is set relatively low compared with cotton spinning, and the output speed of the press roller in the first pass and the second pass is slightly higher than that in the third pass;

[0027] (5) First roving: the PET / visc sliver prepared in step (4) is drawn and attenuated by the drafting system of the first roving, and is twisted and wound by the twisting system to prepare a first PET / visc roving with a certain strength;

[0028] (6) First spinning: the first PET / visc roving prepared in step (5) is drawn and attenuated by the drafting system of the first spinning, and is twisted and wound by the twisting system to prepare a first PET / visc yarn with a certain strength;

[0029] (7) Second roving: the PET / visc sliver prepared in step (4) and the two first PET / visc yarns prepared in step (6) are collectively prepared into a PET / visc composite roving by the second roving process. The roving frame includes a drafting system and a twisting system. The PET / visc sliver is pressed by the back roller of the drafting system and then enters the drafting system. After the drafting action of the drafting system, a PET / visc sliver is obtained. The prepared PET / visc sliver is continuously and actively output by the front roller of the drafting system. One first PET / visc yarn is output by the pressing of the front roller of the drafting system, and the pressing point is located on the left side of the PET / visc sliver. The other first PET / visc yarn is output by the pressing of the front roller of the drafting system, and the pressing point is located on the right side of the PET / visc sliver. The distance between the first PET / visc yarn on the left side and the PET / visc sliver is equal to the distance between the first PET / visc yarn on the right side and the PET / visc sliver. Under the action of the twisting twist of the twisting system of the roving frame, the fibers in the PET / visc sliver transfer to each other, so that a certain holding force between the fibers is generated, and then a PET / visc core roving with a certain strength is obtained. The first PET / visc yarn on the left side of the PET / visc sliver is wrapped on the PET / visc core roving from left to right, and the first PET / visc yarn on the right side of the PET / visc sliver is wrapped on the PET / visc core roving from right to left, and then a PET / visc composite roving is obtained. The wrapping pitch of the two first PET / visc yarns on the PET / visc core roving is determined by the twisting twist of the roving frame and the distance between the first PET / visc yarn and the PET / visc sliver;

[0030] (8) Second spinning: the polyester-viscose composite roving prepared in step (7) is subjected to a second spinning process to prepare a core-sheath composite yarn. The spinning machine comprises a drafting system and a twisting system. The polyester-viscose composite roving is pressed by the back roller of the drafting system and then enters the drafting system. Under the drafting action of the drafting system, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion. During the change, the two first polyester-viscose yarns in the polyester-viscose composite roving tightly wrap the polyester-viscose core roving, so that the fibers in the polyester-viscose core roving are tightly held, thereby forming a stable first friction field between the fibers in the polyester-viscose core roving. The fibers outside the polyester-viscose core roving are tightly wrapped by the two first polyester-viscose yarns, thereby generating a stable friction force between the fibers outside the polyester-viscose core roving by the first polyester-viscose yarns, thereby forming a stable second friction field. Under the comprehensive control of the first and second friction fields, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion in a concentrated speed change process, thereby preparing a polyester-viscose sliver with excellent fiber distribution consistency through the drafting system. At the same time, under the drafting action of the back zone of the drafting system, the polyester-viscose composite roving undergoes partial twist removal, thereby causing the two first polyester-viscose yarns outside the wrapping state to gradually change to a curved non-wrapping state. Under the drafting action of the front zone of the drafting system, the two first polyester-viscose yarns in the curved state are stretched from the curved state to the straight state, and after being stretched, they are continuously stretched, thereby undergoing a certain tensile elongation without being broken. The two first polyester-viscose yarns that are stretched and elongated thereby generate a certain tension. Under the action of the tension, the two first polyester-viscose yarns continuously penetrate into the interior of the polyester-viscose sliver and are output together with the polyester-viscose sliver by the driving action of the front roller of the drafting system. The output polyester-viscose sliver with the penetrated first polyester-viscose yarns is covered with a cover yarn under the action of the twisting twist, and the two first polyester-viscose yarns that penetrate in are further wrapped around the center during the twisting process, thereby obtaining the desired core-sheath composite yarn.

[0031] The embodiments provided in the present application take the preparation of a composite yarn with a linear density of 8 S as an example, and the corresponding process parameters are as follows:

[0032] (1) Raw material selection

[0033]

[0034] (2) Key process parameter design

[0035] Pre-drawing and drawing:

[0036]

[0037]

[0038] First roving:

[0039]

[0040] First roving:

[0041]

[0042] Second roving:

[0043]

[0044] Second roving:

[0045]

Claims

1. A method of producing a composite yarn, characterized by, Comprise the following steps: (1) raw material selection: using single miao raw material of polyester and viscose fiber, adding T / R roving strip and T / R mixed strip; (2) carding: the selected polyester fiber is sequentially grabbed by JWF1012 type reciprocating grabber with TF27 type bridge magnet according to the required mixing ratio, and the metal impurities in the grabbed polyester fiber are separated by the bridge magnet, the blocky impurities in the grabbed polyester fiber are separated and removed by JWF0001 type multifunctional separator, the polyester fiber is conveyed to JWF1026-120 type multi-bin mixing machine by the negative pressure airflow generated by ZF9104 type air blower, the polyester fiber is randomly fed into different high cotton bins of the multi-bin mixing machine to realize mixing, the polyester fiber in each cotton bin is recombined after conveying through different distance paths, further opening and removing impurities are carried out by JWF1124D-120 type cleaner with TF34 type iron adsorption device, and polyester fiber tufts are prepared, the prepared polyester fiber tufts are conveyed to JWF1204A type carding machine by the conveying pipeline driven by FA051A type condensing device+TF26A type overhead device+ZF9104 type air blower, and polyester slivers are prepared, and the prepared polyester slivers are continuously wound in the sliver can by TF2513 type sliver winder; The selected viscose fiber is sequentially grabbed by FA002 type automatic grabber according to the required mixing ratio, the metal and blocky impurities in the grabbed viscose fiber are separated and removed by FA121 metal impurity removal device, the viscose fiber is randomly fed into different high cotton bins of the multi-bin mixing machine to realize feeding and mixing, the viscose fiber in each cotton bin is recombined after conveying through different time paths, the viscose fiber is continuously conveyed to the opener by the conveying pipeline through the adsorption of the condensing device in the FA106A needle beater opener with A045B condensing device, the viscose fiber is distributed by A062 electric cotton distributor, the viscose fiber is continuously conveyed to the cotton feeder by the adsorption of the condensing device in the A092AST double cotton box cotton feeder with A045B condensing device, and the viscose fiber is uniformly layered, the uniformly layered viscose fiber layer is then conveyed to the FA141 lap former, and opening, impurity removal and leveling are carried out in the lap former to prepare uniform viscose lap, the viscose lap is fed into the JWF1204A type carding machine to prepare viscose sliver, and the prepared viscose sliver is continuously wound in the sliver can by TF2513 type sliver winder; (3) pre-drawing: the viscose sliver prepared in step (2) is pre-drawing to improve the evenness of the sliver and adjust the linear density, 7 viscose slivers are fed together, the 7 viscose slivers are drawn and thinned by the drafting system of the drawing frame, and the drawn and thinned viscose sliver is recombined; The polyester sliver prepared in step (2) is subjected to pre-drawing to improve the evenness and adjust the linear density of the polyester pre-drawing sliver, 7 polyester slivers are fed together, and the 7 polyester slivers are drawn and attenuated by the drawing system of the drawing frame, and then the drawn and attenuated polyester slivers are combined again; (4) Drawing: the viscose pre-drawing sliver and the polyester pre-drawing sliver prepared in step (3) are drawn together by three drawing processes to prepare a polyester-viscose slubbing, in the first drawing process, 8 viscose pre-drawing slivers and polyester pre-drawing slivers are fed together, the number of the viscose pre-drawing slivers and the polyester pre-drawing slivers is determined according to the blending ratio of the polyester fiber and the viscose fiber in the blended yarn and the linear density of the prepared viscose pre-drawing sliver and the polyester pre-drawing sliver, the 8 viscose pre-drawing slivers and the polyester pre-drawing slivers are drawn and attenuated by the drawing system of the drawing frame and then combined again to prepare a polyester-viscose blending sliver; in the second drawing process, 8 polyester-viscose blending slivers are fed, the 8 polyester-viscose blending slivers are drawn and attenuated by the drawing system of the drawing frame and then combined again to prepare a polyester-viscose semi-drawing sliver; in the third drawing process, 8 polyester-viscose semi-drawing slivers are fed, the 8 polyester-viscose semi-drawing slivers are drawn and attenuated by the drawing system of the drawing frame and then combined again to prepare a polyester-viscose drawing sliver; In the drawing process, the speed of the compression roller in the first drawing process and the second drawing process is slightly greater than that in the third drawing process; (5) First roving: the polyester-viscose drawing sliver prepared in step (4) is drawn and attenuated by the drawing system of the first roving and is twisted and wound by the twisting system to prepare a first polyester-viscose roving with a certain strength; (6) First spinning: the first polyester-viscose roving prepared in step (5) is drawn and attenuated by the drawing system of the first spinning and is twisted and wound by the twisting system to prepare a first polyester-viscose yarn with a certain strength; (7) the second roving: the polyester-viscose slubbing and the two first polyester-viscose yarns prepared in step (6) are subjected to the second roving process to prepare a polyester-viscose composite roving, the roving frame comprises a drafting system and a twisting system, the polyester-viscose slubbing is pressed by the back roller of the drafting system and then enters the drafting system, the polyester-viscose sliver is obtained after the drafting action of the drafting system, and the prepared polyester-viscose sliver is continuously actively outputted by the front roller of the drafting system, one first polyester-viscose yarn is outputted by the pressing of the front roller of the drafting system, and the pressing point is located on the left side of the polyester-viscose sliver, the other first polyester-viscose yarn is outputted by the pressing of the front roller of the drafting system, and the pressing point is located on the right side of the polyester-viscose sliver, and the distance between the first polyester-viscose yarn on the left side and the polyester-viscose sliver is equal to the distance between the first polyester-viscose yarn on the right side and the polyester-viscose sliver, under the action of the twisting twist of the twisting system of the roving frame, the polyester-viscose sliver actively outputted by the front roller and the two first polyester-viscose yarns are subjected to mutual transfer in the polyester-viscose sliver, so that a certain holding force between the fibers is generated, and then a polyester-viscose core roving with a certain strength is obtained, the first polyester-viscose yarn on the left side of the polyester-viscose sliver is wrapped on the polyester-viscose core roving from left to right, and the first polyester-viscose yarn on the right side of the polyester-viscose sliver is wrapped on the polyester-viscose core roving from right to left, and then a polyester-viscose composite roving is obtained, and the wrapping pitch of the two first polyester-viscose yarns on the polyester-viscose core roving is determined by the twisting twist of the roving frame and the distance between the first polyester-viscose yarn and the polyester-viscose sliver; (8) Second spinning: the polyester-viscose composite roving prepared in step (7) is subjected to a second spinning process to prepare a core-spun composite yarn. The spinning machine comprises a drafting system and a twisting system. The polyester-viscose composite roving is pressed by the back roller of the drafting system and then enters the drafting system. Under the drafting action of the drafting system, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion. During the change, the two first polyester-viscose yarns in the polyester-viscose composite roving tightly wrap the polyester-viscose core roving, so that the fibers in the polyester-viscose core roving are tightly held, thereby forming a stable first friction field between the fibers in the polyester-viscose core roving. The fibers outside the polyester-viscose core roving are tightly wrapped by the two first polyester-viscose yarns, thereby generating a stable friction force between the fibers outside the polyester-viscose core roving by the first polyester-viscose yarns, thereby forming a stable second friction field. Under the comprehensive control of the first and second friction fields, the fibers in the polyester-viscose core roving in the polyester-viscose composite roving change from slow motion to fast motion in a concentrated speed change process, thereby preparing a polyester-viscose sliver with excellent fiber distribution consistency through the drafting system. At the same time, under the drafting action of the back zone of the drafting system, the polyester-viscose composite roving partially loses twist, thereby causing the two first polyester-viscose yarns outside the wrapping state to gradually change to a curved non-wrapping state. Under the drafting action of the front zone of the drafting system, the two first polyester-viscose yarns in the curved state are stretched from the curved state to the straight state, and after being stretched, they are continuously stretched, thereby generating a certain tensile elongation without being broken. The two first polyester-viscose yarns that are stretched and elongated thereby generate a certain tension. Under the action of the tension, the two first polyester-viscose yarns continuously penetrate into the interior of the polyester-viscose sliver and are output together with the polyester-viscose sliver by the driving action of the front roller of the drafting system. The output polyester-viscose sliver with the penetrated first polyester-viscose yarns is covered with a cover yarn under the action of the twisting twist, and the two first polyester-viscose yarns that penetrate into the center are further wrapped in the center during the twisting process, thereby obtaining the required core-spun composite yarn.

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