A method for producing a composite core yarn

Abstract

This invention discloses a method for producing composite core-spun yarn, comprising the following steps: (1) raw material selection; (2) cotton opening and cleaning; (3) carding; (4) drawing; (5) roving; (6) plying of filament bundles; and (7) spinning. This invention obtains plyed filament bundles from 2-5 filament bundles using a ring-spinning twisting machine, and then performs single-core spinning on the plyed filament bundles as a whole in the spinning process, thereby significantly improving the core-spun effect on multiple filament bundles. Simultaneously, the plying of multiple filament bundles significantly increases the strength of the spun composite yarn.

Description

Technical Field

[0001] This invention relates to the field of novel yarns, and in particular to a method for producing composite core-spun yarn. Background Technology

[0002] With the development of society and the economy, and the continuous improvement of people's living standards, consumers are increasingly focusing on the fashion and functionality of clothing textiles, in addition to comfort. They seek unique styles and various functions, such as antibacterial and antistatic properties. To meet this consumer demand, continuously developing new yarns and fabrics has become an important task for the textile industry. With the advancement of science and technology, competition in the textile market is becoming increasingly fierce. To maximize profits, manufacturers are constantly moving towards higher-end, higher-quality, more technologically advanced, and higher-value-added products. Summary of the Invention

[0003] The purpose of this invention is to provide a method for producing composite core-spun yarn to solve the problems existing in the prior art.

[0004] This invention provides a method for producing composite core-spun yarn, comprising the following steps:

[0005] (1) Raw material selection: The ratio of polyester to viscose in each box of automatic cotton grabber is 98.4% polyester and 1.6% viscose;

[0006] (2) Opening and cleaning: The selected polyester fibers and viscose fibers are sequentially picked up by the A002D disc cotton picker according to the mixing ratio, and the picked fibers are opened and mixed by the A035F mixing cotton opener. The fibers are further opened and impurities are removed by the FA106A comb needle cotton opener, and then a uniform polyester-viscose mixed roll is formed by the A076F single beater roll forming machine.

[0007] (3) Carding: The polyester-viscose blended roll obtained in step (1) is finely opened, combed, impurities removed and slivered by a carding machine to obtain a polyester-viscose blended sliver;

[0008] (4) Drawing: The polyester-viscose mixed strips obtained in step (3) are drawn in two stages to obtain polyester-viscose mixed cooked strips. In the first stage of drawing, 8 polyester-viscose mixed strips obtained in step (3) are fed together, and after being drawn and thinned by the drawing system of the drawing machine, they are re-drawn to obtain polyester-viscose mixed semi-cooked strips. In the second stage of drawing, 8 polyester-viscose mixed semi-cooked strips are fed together, and after being drawn and thinned by the drawing system of the drawing machine, they are re-drawn to obtain polyester-viscose mixed cooked strips.

[0009] (5) Roving: The polyester-viscose blend sliver obtained in step (4) is stretched and thinned by the drafting system of the roving machine and twisted and transferred by the twisting and winding system to obtain a polyester-viscose blend roving with a certain strength.

[0010] (6) Filament bundle plying: 2-5 filament bundles are plyed using a ring twisting machine. This includes three scenarios: When the elastic elongation of each filament bundle differs by less than 10%, the 2-5 filament bundles are directly plyed together using a ring twisting machine to form a plyed filament bundle that is directly twisted and intertwined. In this case, a conical bobbin with the filament bundles is inserted into the corresponding insert pin. The 2-5 conical bobbins can be arranged in a horizontal straight line, at equal spatial angles, or in an arc-shaped plane. The filament bundles are then drawn out from the conical bobbins. After being drawn out, the filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller and are drawn out. The twist of the drawn filament bundles is... Under the action of the yarn, the filaments are twisted and intertwined to form a bundle of filaments. The bundle of filaments passes through the yarn breakage stopper, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube. The yarn tube is driven to rotate by the spindle, so that the bundle of filaments is continuously wound around the yarn tube. During this process, the rotation of the yarn tube drives the bundle of filaments to rotate, and then drives the steel wire loop to rotate around the ring. At this time, due to the elasticity of the bundle of filaments itself and the weight of the steel wire loop, the rotation speed of the bundle of filaments is less than the rotation speed of the yarn tube. The speed difference between the bundle of filaments and the yarn tube produces a twist on the bundle of filaments. The twist is transmitted from bottom to top along the bundle of filaments. The filaments after being drawn out are twisted and intertwined under the action of the transmitted twist to form a bundle of filaments.

[0011] When the fed filament bundles are divided into two categories based on elasticity, the elastic elongation rates of the filament bundles in the first category differ by less than 10%, and the elastic elongation rates of the filament bundles in the second category differ by less than 10%. Furthermore, the average elastic elongation rate of the first category filament bundles differs from that of the second category by more than 10%, and the average elastic elongation rate of the first category filament bundles is less than that of the second category filament bundles. In this case, the conical bobbin wound with the first category filament bundles is inserted into the corresponding insert pins. The filament bundles are then drawn out from the conical bobbin. After being drawn out, the filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, and then pass under the lower roller, before passing between the upper and lower roller nipples. Finally... The second type of filament bundle is drawn out by bypassing the upper roller and embedded in the corresponding insert pin. Then the filament bundle is drawn out from the conical cylinder and passed directly between the upper and lower roller nipples. The pressing point of the second type of filament bundle between the upper and lower roller nipples is located to the left or right of the pressing point of the first type of filament bundle between the upper and lower roller nipples. The first type of filament bundle is twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the second type of filament bundle is wrapped around the ply filament core bundle to form a ply filament bundle. The ply filament bundle passes through the end-breaking stop device, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube.

[0012] When the fed filament bundles are divided into three categories based on their elasticity, the elastic elongation rates of the filament bundles in the first category differ by less than 10%, the elastic elongation rates of the filament bundles in the second category differ by less than 10%, and the elastic elongation rates of the filament bundles in the third category differ by less than 10%. Furthermore, the average elastic elongation rates of the filament bundles in the first, second, and third categories all differ by more than 10%, and the average elastic elongation rate of the filament bundles in the first category is less than that of the filament bundles in the second category. If the elastic elongation rate and the average elastic elongation rate of the second type of filament bundle are less than the average elastic elongation rate of the third type of filament bundle, then the conical bob with the first type of filament bundle is inserted into the corresponding insert pin. The filament bundle is then drawn out from the conical bob. The drawn filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller. The conical bob with the second type of filament bundle is then inserted into the corresponding insert pin. The filament bundle is then... The filament bundle is drawn from a conical cylinder, and the drawn filament bundle passes directly between the upper and lower roller jaws. The pressing point of the second type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle between the upper and lower roller jaws. The conical cylinder with the third type of filament bundle wound on it is embedded in the corresponding insert pin. Then, the filament bundle is drawn from the conical cylinder, and the drawn filament bundle passes directly between the upper and lower roller jaws. The pressing point of the third type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle. To the right of the pressing point of the upper and lower roller nipples, the first type of filament bundles, after being drawn out, are twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the third type of filament bundle first wraps around the ply filament core bundle, and then the second type of filament bundle wraps around the ply filament core bundle. The third type of filament bundle and the second type of filament bundle wrap around the ply filament core bundle in turn to obtain the ply filament bundle. The ply filament bundle passes through the end-break stop device, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube.

[0013] (7) Spinning: The polyester-viscose blended roving obtained in step (5) and the ply filament bundle obtained in step (6) are processed together by a spinning machine to obtain the final composite yarn. The spinning adopts the core-spun yarn production process. A single core filament feeding device is set at the upper part of the drafting system of the spinning machine. The single core filament feeding device includes a conveying roller. The conveying roller is installed at the lower part of the roving spindle of the spinning machine and is driven by a chain. The linear speed of the conveying roller is lower than that of the front roller. A guide roller is set above the pressure cradle of the drafting system. The bobbin with the ply filament bundle obtained in step 6 is placed on the conveying roller. The conveying roller rotates and then realizes the active unwinding of the ply filament bundle. The actively unwound ply filament bundle is then passed around the upper part of the guide roller and then output by the pressing of the front roller. At this time, due to the linear speed of the conveying roller, the ply filament bundle is driven by a chain. The speed is lower than the linear speed of the front roller, thus applying a pre-drafting effect to the ply filament bundle and controlling its elongation to a constant value, that is, controlling the content of the ply filament bundle in the composite yarn. The polyester-viscose blended roving obtained in the fifth step is fed into the back roller of the drafting system. After being drafted by the drafting system, it is pressed out by the front roller to obtain a polyester-viscose blended sliver. The pressing point of the ply filament bundle at the front roller is located at the center of the pressing point of the polyester-viscose blended sliver at the front roller. The polyester-viscose blended sliver and the ply filament bundle that are jointly output are twisted into a composite yarn under the action of the twisting twist on the spinning machine. In this process, the polyester-viscose blended sliver is twisted into a polyester-viscose blended yarn under the action of the twisting twist. During the twisting process, the ply filament bundle is wrapped in the center, thus obtaining a composite yarn in which the polyester-viscose blended yarn is the outer yarn and the ply filament bundle is the core yarn.

[0014] In the above-described method for producing composite core-spun yarn, preferably, in step (1), the polyester comprises 70% Yizheng polyester and 28.4% Zha Shang Yi Xin polyester, and the viscose is selected from Tangshan Sanyou viscose staple fiber.

[0015] In the method for producing composite core-spun yarn as described above, preferably, the drafting ratio of the drafting system of the first drawing sliver in step (4) is set between 8.3 and 8.6.

[0016] In the method for producing composite core-spun yarn as described above, preferably, the drafting ratio of the drafting system of the second drawing sliver in step (4) is set between 8.6 and 8.8.

[0017] In the production method of composite core-spun yarn described above, preferably, the drawing of the sliver in step (4) adopts centralized drafting, and the pressure application method of the drafting system adopts spring rocker pressurization.

[0018] In the above-described method for producing composite core-spun yarn, preferably, the back zone drafting ratio of the drafting system of the drawing sliver in step (4) is set between 1.2 and 2.0 times, and the middle zone is a fixed drafting ratio of 1.018 times.

[0019] Compared with existing technologies, this invention uses a cotton grabber to grab selected polyester and viscose fibers according to a blending ratio, and then sequentially processes them through opening and cleaning, carding, two drawing processes, and roving to produce a polyester-viscose blended roving. Two to five filament bundles are then twisted together using a ring twisting machine to obtain a ply filament bundle. When the elasticity of the filament bundles is similar, the two to five filament bundles are directly twisted together using a ring twisting machine to obtain a ply filament bundle that is directly twisted and intertwined. When the fed filament bundles are adjusted according to their elasticity... When the filaments are divided into two categories based on elasticity, and the elasticity of the filament bundles in each category is similar, the filament bundle with less elasticity is fed from the rear of the upper and lower rollers of the ring twisting machine, while the filament bundle with greater elasticity is fed from the left or right side of the upper and lower rollers. This allows the filament bundles with less elasticity to be directly twisted and intertwined to form a ply filament core bundle, while the filament bundles with less elasticity wrap around the ply filament core bundle to form a ply filament bundle. When the fed filament bundles are divided into three categories based on elasticity, and the elasticity of the filament bundles in each category is similar, the filament bundle with the least elasticity is fed from the rear of the upper and lower rollers of the ring twisting machine, while the filament bundles with the second and largest elasticities are fed from the left and right sides of the upper and lower rollers, respectively. This allows the filament bundles with less elasticity to be directly twisted and intertwined to form a ply filament core bundle, while the filament bundles with the largest elasticity wrap around the ply filament core bundle to form a ply filament bundle. First, a bundle of filaments is wrapped around a core bundle of ply filaments. Then, a bundle of filaments with the second highest elasticity is wrapped around the core bundle to obtain a ply filament bundle. In the spinning process, a single-core-spun process is used. Polyester-viscose blended roving is fed into the spinning machine by the back roller and drafted to obtain a polyester-viscose blended sliver. The ply filament bundle is fed into the spinning machine by the front roller through a single-core-spun device. The fed ply filament bundle and the polyester-viscose blended sliver are output through the front roller and twisted to obtain a polyester-viscose blended core-spun yarn. This invention significantly improves the core-spun effect of multiple filament bundles, and the plying of multiple filament bundles greatly increases the strength of the spun composite yarn. Detailed Implementation

[0020] The embodiments described below with reference to the present invention are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] This invention provides a method for producing composite core-spun yarn, comprising the following steps:

[0022] (1) Raw material selection: The blending ratio of polyester and viscose in each box of automatic cotton grabber is 98.4% polyester, including 70% Yizheng polyester and 28.4% Zha Shang Yi Xin polyester. The viscose is selected from Tangshan Sanyou viscose short fiber, with a blending ratio of 1.6%. This allows the subsequent fabric to maintain the characteristics of polyester, such as strength, wrinkle resistance, dimensional stability, and strong washability and wearability. The blending of viscose fiber improves the breathability of the fabric, enhances the resistance to melting holes, reduces pilling and static electricity, and makes the fabric smooth, bright, with a strong wool-like feel, good hand elasticity, and good moisture absorption.

[0023] (2) Opening and cleaning: The selected polyester and viscose fibers are sequentially picked up by an A002D disc-type cotton picker according to the mixing ratio, and the fibers are initially opened and mixed during the picking process. The picked fibers are then opened and mixed by an A035F type blending and opening machine, and impurities are separated and removed during the opening process. The fibers are further opened and impurities are removed by a FA106A type carding and opening machine. Finally, a uniform polyester-viscose mixed roll is formed by an A076F type single-beater lap forming machine. The opening and cleaning process adopts the principles of "reasonable cotton matching, multiple bales for use, frequent picking with small amounts, and enhanced mixing". The process design principles are: "combination, short process, low speed, fine cotton grabbing, thorough mixing, gradual opening, reduced tumbling, more combing, more loosening and less beating, thin feeding, light quantity, large spacing, more mixing, early drop and less breakage, no fiber damage, combing instead of beating, less tumbling, anti-sticking, gradual opening, small amount grabbing, thorough mixing, low speed, and thin feeding." In the disc cotton grabbing process, according to the principle of fine cotton grabbing, the amount of cotton grabbed per tooth of the cotton grabbing beater blade of the disc cotton grabbing machine is kept to a small degree. In the carding needle cotton opening process, the mechanical parts between the beater and the dust bar are used to complete the opening and impurity removal of the fibers.

[0024] (3) Carding: The polyester-viscose blended roll obtained in step (1) is finely opened, combed, impurities removed and formed into a sliver by a carding machine to obtain a polyester-viscose blended sliver. The carding machine should improve its mechanical condition level, do a good job of "five peaks and one accuracy", and adopt the process design principle of "high speed, tight spacing and strong combing". It is required that each channel is not only clean and free of oil stains, but also free of cotton and cotton accumulation during operation, so as to produce a polyester-viscose blended sliver with clear cotton web, uniform yarn, small weight unevenness and few cotton knots and impurities. In terms of process, the saw teeth or comb needles are required to be sharp, the spacing is accurate and the speed is reasonable, so that the polyester-viscose blended sliver has a good structure and stable quality.

[0025] (4) Drawing: The polyester-viscose blended strips obtained in step (3) are drawn in two stages to obtain polyester-viscose blended cooked strips. In the first stage, eight polyester-viscose blended strips obtained in step (3) are fed together, stretched and thinned by the drawing system of the drawing machine, and then re-combined to obtain polyester-viscose blended semi-cooked strips. The drawing ratio of the drawing system is set between 8.3 and 8.6. In the second stage, eight polyester-viscose blended semi-cooked strips are fed together, stretched and thinned by the drawing system of the drawing machine, and then re-combined to obtain polyester-viscose blended cooked strips. The drawing ratio of the drawing system is set between 8.6 and 8.8. The drawing machine should be improved. The quality of mechanical finishing should meet the requirements for eccentricity, bending, and gap of the drafting rollers, rubber roller shells, and cores. The surface of the rubber rollers should be smooth, the pressure should be firm and consistent at both ends, the sliver passage should be clean and free of lint, the opening and position of the cotton collector should be appropriate, the end-breakage self-stop device should be in good condition, and the drafting gears should mesh normally to improve sliver evenness and prevent yarn defects. During the drawing process, the control of sliver evenness CV value and weight unevenness should be the main focus. Centralized drafting should be adopted, and the pressure method of the drafting system should be spring rocker pressurization. The drafting ratio in the back zone should be set between 1.2 and 2.0 times, and the drafting ratio in the middle zone should be a fixed drafting ratio of 1.018 times.

[0026] (5) Roving: The polyester-viscose blend sliver obtained in step (4) is stretched and thinned by the drafting system of the roving frame and twisted and transferred by the twisting and winding system to obtain a polyester-viscose blend roving with a certain strength. In the roving frame, the stretching action of the drafting system continues to improve the straightness of the fibers. The mutual transfer between fibers in the roving is realized through twisting and gathering, which in turn generates interaction forces between the fibers in the roving, thereby providing an internal friction boundary for the fine yarn drafting and creating conditions for the large drafting of the fine yarn frame. The roving process design aims to improve the quality of the roving, achieving stable elongation, small weight difference, uniform yarn, compact structure, and good forming. In the process design, the drafting ratio should be reasonably selected, the roller spacing should be reasonably configured according to the fiber length, the roller pressure should be relatively heavy, and the roving should be strictly controlled. The elongation rate should be optimized, and the roving twist coefficient should be configured appropriately. The roving frame should improve its mechanical leveling quality, ensuring normal meshing of the drafting gears, proper roller bending and rubber roller eccentricity, and no oil shortage. The cotton collector openings should be consistent and properly positioned, the rubber rollers should rotate flexibly, and the starting position of the rollers should be correct. This will stabilize the elongation rate, maintain a clean spindle shell, ensure normal operation, and prevent cotton from getting caught in the channels. This will improve roving evenness, reduce weight unevenness, and minimize yarn defects. The roving twist should meet the needs of the roving itself for winding and forming, as well as the unwinding tension on the spinning frame, and further meet the needs of the spinning frame's large drafting for untwisting and drafting in the back zone. When designing the roving twist, considering the finer raw materials, lighter weight, and to facilitate subsequent processes, a smaller twist coefficient should be used, but not too small, to prevent accidental drafting.

[0027] (6) Filament bundle plying: 2-5 filament bundles are plyed using a ring twisting machine. This includes three scenarios: When the elastic elongation of each filament bundle differs by less than 10%, the 2-5 filament bundles are directly plyed together using a ring twisting machine to form a plyed filament bundle that is directly twisted and intertwined. In this case, a conical bobbin with the filament bundles is inserted into the corresponding insert pin. The 2-5 conical bobbins can be arranged in a horizontal straight line, at equal spatial angles, or in an arc-shaped plane. The filament bundles are then drawn out from the conical bobbins. After being drawn out, the filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller and are drawn out. The twist of the drawn filament bundles is... Under the action of the yarn, the filaments are twisted and intertwined to form a bundle of filaments. The bundle of filaments passes through the yarn breakage stopper, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube. The yarn tube is driven to rotate by the spindle, so that the bundle of filaments is continuously wound around the yarn tube. During this process, the rotation of the yarn tube drives the bundle of filaments to rotate, and then drives the steel wire loop to rotate around the ring. At this time, due to the elasticity of the bundle of filaments itself and the weight of the steel wire loop, the rotation speed of the bundle of filaments is less than the rotation speed of the yarn tube. The speed difference between the bundle of filaments and the yarn tube produces a twist on the bundle of filaments. The twist is transmitted from bottom to top along the bundle of filaments. The filaments after being drawn out are twisted and intertwined under the action of the transmitted twist to form a bundle of filaments.

[0028] When the fed filament bundles are divided into two categories based on elasticity, the elastic elongation rates of the filament bundles in the first category differ by less than 10%, and the elastic elongation rates of the filament bundles in the second category differ by less than 10%. Furthermore, the average elastic elongation rate of the first category filament bundles differs from that of the second category by more than 10%, and the average elastic elongation rate of the first category filament bundles is less than that of the second category filament bundles. In this case, the conical bobbin wound with the first category filament bundles is inserted into the corresponding insert pins. The filament bundles are then drawn out from the conical bobbin. After being drawn out, the filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, and then pass under the lower roller, before passing between the upper and lower roller nipples. Finally... The second type of filament bundle is drawn out by bypassing the upper roller and embedded in the corresponding insert pin. Then the filament bundle is drawn out from the conical cylinder and passed directly between the upper and lower roller nipples. The pressing point of the second type of filament bundle between the upper and lower roller nipples is located to the left or right of the pressing point of the first type of filament bundle between the upper and lower roller nipples. The first type of filament bundle is twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the second type of filament bundle is wrapped around the ply filament core bundle to form a ply filament bundle. The ply filament bundle passes through the end-breaking stop device, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube.

[0029] When the fed filament bundles are divided into three categories based on their elasticity, the elastic elongation rates of the filament bundles in the first category differ by less than 10%, the elastic elongation rates of the filament bundles in the second category differ by less than 10%, and the elastic elongation rates of the filament bundles in the third category differ by less than 10%. Furthermore, the average elastic elongation rates of the filament bundles in the first, second, and third categories all differ by more than 10%, and the average elastic elongation rate of the filament bundles in the first category is less than that of the filament bundles in the second category. If the elastic elongation rate and the average elastic elongation rate of the second type of filament bundle are less than the average elastic elongation rate of the third type of filament bundle, then the conical bob with the first type of filament bundle is inserted into the corresponding insert pin. The filament bundle is then drawn out from the conical bob. The drawn filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller. The conical bob with the second type of filament bundle is then inserted into the corresponding insert pin. The filament bundle is then... The filament bundle is drawn from a conical cylinder, and the drawn filament bundle passes directly between the upper and lower roller jaws. The pressing point of the second type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle between the upper and lower roller jaws. The conical cylinder with the third type of filament bundle wound on it is embedded in the corresponding insert pin. Then, the filament bundle is drawn from the conical cylinder, and the drawn filament bundle passes directly between the upper and lower roller jaws. The pressing point of the third type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle. To the right of the pressing point of the upper and lower roller nipples, the first type of filament bundles, after being drawn out, are twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the third type of filament bundle first wraps around the ply filament core bundle, and then the second type of filament bundle wraps around the ply filament core bundle. The third type of filament bundle and the second type of filament bundle wrap around the ply filament core bundle in turn to obtain the ply filament bundle. The ply filament bundle passes through the end-break stop device, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube.

[0030] (7) Spinning: The polyester-viscose blended roving obtained in step (5) and the ply filament bundle obtained in step (6) are processed together by a spinning machine to obtain the final composite yarn. The spinning adopts the core-spun yarn production process. A single core filament feeding device is set at the upper part of the drafting system of the spinning machine. The single core filament feeding device includes a conveying roller. The conveying roller is installed at the lower part of the roving spindle of the spinning machine and is driven by a chain. The linear speed of the conveying roller is lower than that of the front roller. A guide roller is set above the pressure cradle of the drafting system. The bobbin with the ply filament bundle obtained in step 6 is placed on the conveying roller. The conveying roller rotates and then realizes the active unwinding of the ply filament bundle. The actively unwound ply filament bundle is then passed around the upper part of the guide roller and then output by the pressing of the front roller. At this time, due to the linear speed of the conveying roller, the ply filament bundle is driven by a chain. The speed is lower than the linear speed of the front roller, thus applying a pre-drafting effect to the ply filament bundle and controlling its elongation to a constant value, that is, controlling the content of the ply filament bundle in the composite yarn. The polyester-viscose blended roving obtained in the fifth step is fed into the back roller of the drafting system. After being drafted by the drafting system, it is pressed out by the front roller to obtain a polyester-viscose blended sliver. The pressing point of the ply filament bundle at the front roller is located at the center of the pressing point of the polyester-viscose blended sliver at the front roller. The polyester-viscose blended sliver and the ply filament bundle that are jointly output are twisted into a composite yarn under the action of the twisting twist on the spinning machine. In this process, the polyester-viscose blended sliver is twisted into a polyester-viscose blended yarn under the action of the twisting twist. During the twisting process, the ply filament bundle is wrapped in the center, thus obtaining a composite yarn in which the polyester-viscose blended yarn is the outer yarn and the ply filament bundle is the core yarn.

[0031] Example 1

[0032] Taking the preparation of spandex composite yarn with a linear density of 14STR / 70D×2 as an example, the corresponding process parameters are as follows:

[0033] (1) Cotton blending:

[0034] Viscose cotton blending table and performance indicators of each cotton bale

[0035]

[0036] Polyester blended with cotton and performance indicators of each cotton bale

[0037]

[0038] (2) Design of key process parameters and preliminary quantitative selection of each process.

[0039] Cotton roll wet weight 413.8g / m Cotton roll dry weight 407.25g / m Raw strips quantitative 23.80g / 5m First-pass and strip quantity 22.90g / 5m Two-stage parallel strip quantitative analysis 21g / 5m roving dry weight 6.1g / 10m

[0040] Opening and cleaning cotton:

[0041] A002D type disc cotton grabber

[0042] process parameters Parameter Design Trolley rotation speed (r / min) 1.7，2.3 Cotton-grabbing beater speed (rpm) 740 Blade extension distance beyond rib (mm) 2.75 Distance of descent between hitter intervals (mm / attack) 3.25

[0043] A035F type cotton blending machine

[0044]

[0045]

[0046] FA106A type carding opener

[0047]

[0048]

[0049] A076F Single-hand Coiling Machine

[0050]

[0051] Process parameter table for polyester-viscose blend roll design

[0052] process parameters Parameter Design process parameters Parameter Design Dry quantity (g / m) 407.25 Actual length (m) 45.96 Wet quantity (g / m³) 413.8 Clean weight (kg) 18.72 Length (m) 44.84 Wet net weight (kg) 19.02 Elongation (%) 2.5

[0053] Cotton opening and cleaning process design table

[0054]

[0055]

[0056] Combing:

[0057]

[0058] Parallelism:

[0059]

[0060]

[0061] Coarse yarn:

[0062]

[0063] Fine yarn:

[0064]

[0065]

[0066] Winding tube:

[0067]

[0068] (4) Yarn quality testing:

[0069] Mechanical properties

[0070]

[0071] Hairiness index

[0072]

[0073] uniformity of strips

[0074]

[0075] The above description, based on the embodiments shown, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention does not limit the scope of implementation. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. A method for producing composite core-spun yarn, characterized in that, Includes the following steps: (1) Raw material selection: The ratio of polyester to viscose blend in each box of automatic cotton grabber is 98.4% polyester and 1.6% viscose; (2) Opening and cleaning: The selected polyester fibers and viscose fibers are sequentially picked up by the A002D disc cotton picker according to the mixing ratio, and the picked fibers are opened and mixed by the A035F mixing cotton opener. The fibers are further opened and impurities are removed by the FA106A comb needle cotton opener, and a uniform polyester-viscose mixed roll is formed by the A076F single beater roll forming machine. (3) Carding: The polyester-viscose blended roll obtained in step (2) is finely opened, carded, impurities removed and slivered by a carding machine to obtain a polyester-viscose blended sliver; (4) Drawing: The polyester-viscose mixed strips obtained in step (3) are drawn in two stages to obtain polyester-viscose mixed cooked strips. In the first stage of drawing, 8 polyester-viscose mixed strips obtained in step (3) are fed together, and after being drawn and thinned by the drawing system of the drawing machine, they are drawn together again to obtain polyester-viscose mixed semi-cooked strips. In the second stage of drawing, 8 polyester-viscose mixed semi-cooked strips are fed together, and after being drawn and thinned by the drawing system of the drawing machine, they are drawn together again to obtain polyester-viscose mixed cooked strips. (5) Roving: The polyester-viscose blend sliver obtained in step (4) is stretched and thinned by the drafting system of the roving frame and twisted and transferred by the twisting and winding system to obtain a polyester-viscose blend roving with a certain strength. (6) Filament bundle plying: 2-5 filament bundles are plyed by a ring twisting machine, including three cases: when the elastic elongation of each filament bundle differs by less than 10%, the 2-5 filament bundles are directly plyed by a ring twisting machine to form a plyed filament bundle that is directly twisted and intertwined. In this case, a conical bobbin with the filament bundles is embedded in the corresponding insert pin. The 2-5 conical bobbins can be arranged in a horizontal straight line, or in a spatial equiangular arrangement, or in an arc-shaped plane. Then, the filament bundles are drawn out from the conical bobbins. The drawn filament bundles pass together through the yarn guide rod, are arranged and merged at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller to be drawn out. The drawn filament bundles are twisted to a certain degree. Under the action of the yarn, the filaments are twisted and intertwined to form a bundle of filaments. The bundle of filaments passes through the yarn breakage stopper, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube. The yarn tube is driven to rotate by the spindle, so that the bundle of filaments is continuously wound around the yarn tube. During this process, the rotation of the yarn tube drives the bundle of filaments to rotate, and then drives the steel wire loop to rotate around the ring. At this time, due to the elasticity of the bundle of filaments itself and the weight of the steel wire loop, the rotation speed of the bundle of filaments is less than the rotation speed of the yarn tube. The speed difference between the bundle of filaments and the yarn tube produces a twist on the bundle of filaments. The twist is transmitted from bottom to top along the bundle of filaments. The filaments after being drawn out are twisted and intertwined under the action of the transmitted twist to form a bundle of filaments. When the fed filament bundles are divided into two categories based on elasticity, the elastic elongation rates of the filament bundles in the first category differ by less than 10%, and the elastic elongation rates of the filament bundles in the second category differ by less than 10%. Furthermore, the average elastic elongation rate of the first category filament bundles differs from that of the second category by more than 10%, and the average elastic elongation rate of the first category filament bundles is less than that of the second category filament bundles. In this case, the conical bobbin wound with the first category filament bundles is embedded in the corresponding insert pin. The filament bundles are then drawn out from the conical bobbin. After being drawn out, the filament bundles pass together through the yarn guide rod, align and merge at the yarn guide, then pass under the lower roller, and finally pass between the upper and lower roller nipples. The second type of filament bundle is drawn out by bypassing the upper roller and embedded in the corresponding insert pin. Then the filament bundle is drawn out from the conical cylinder and passed directly between the upper and lower roller nipples. The pressing point of the second type of filament bundle between the upper and lower roller nipples is located to the left or right of the pressing point of the first type of filament bundle between the upper and lower roller nipples. The first type of filament bundle is twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the second type of filament bundle wraps around the ply filament core bundle to form a ply filament bundle. The ply filament bundle passes through the end-breaking stop device, through the yarn guide hook, around the rotating steel wire loop on the ring, and finally around the yarn tube. When the fed filament bundles are divided into three categories based on their elasticity, the elastic elongation rates of the filament bundles in the first category, the second category, and the third category all differ by less than 10%. Furthermore, the average elastic elongation rates of the filament bundles in the first, second, and third categories all differ by more than 10% from each other, and the average elastic elongation rate of the filament bundles in the first, second, and third categories is less than the average elastic elongation rate of the filament bundles in the second category. If the average elastic elongation of the second type of filament bundle is less than that of the third type of filament bundle, then the conical bob wound with the first type of filament bundle is embedded in the corresponding insert pin. The filament bundle is then drawn out from the conical bob. The drawn filament bundles pass together through the yarn guide rod, align and merge at the yarn guide, pass under the lower roller, then pass between the upper and lower roller nipples, and finally pass over the upper roller. The conical bob wound with the second type of filament bundle is then embedded in the corresponding insert pin. The filament bundle is then... The filament bundles, drawn from a conical cylinder, pass directly between the upper and lower roller jaws. The pressing point of the second type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle. A conical cylinder wound with a third type of filament bundle is embedded in the corresponding insert pin. The filament bundles are then drawn from the conical cylinder, passing directly between the upper and lower roller jaws. The pressing point of the third type of filament bundle between the upper and lower roller jaws is located to the left of the pressing point of the first type of filament bundle. To the right of the pressing point of the upper and lower roller nip, the first type of filament bundle after being drawn out is twisted and intertwined with each other under the action of twisting to obtain a ply filament core bundle. At the same time, during the twisting process, the third type of filament bundle first wraps around the ply filament core bundle, and then the second type of filament bundle wraps around the ply filament core bundle. The third type of filament bundle and the second type of filament bundle wrap around the ply filament core bundle in turn to obtain the ply filament bundle. The ply filament bundle passes through the end-break stop device, through the yarn guide hook, then around the rotating steel wire loop on the ring, and finally around the yarn tube. (7) Spinning: The polyester-viscose blended roving obtained in step (5) and the ply filament bundle obtained in step (6) are processed together by a spinning machine to obtain the final composite yarn. The spinning adopts the core-spun yarn production process. A single core filament feeding device is set on the upper part of the drafting system of the spinning machine. The single core filament feeding device includes a conveying roller. The conveying roller is installed on the lower part of the roving spindle of the spinning machine and is driven by a chain. The linear speed of the conveying roller is lower than that of the front roller. A guide roller is set on the upper part of the pressure cradle of the drafting system. The yarn tube with the ply filament bundle obtained in step 6 is placed on the conveying roller. The conveying roller rotates and then realizes the active unwinding of the ply filament bundle. The actively unwinding ply filament bundle is then passed around the upper part of the guide roller and then output by the pressing of the front roller. At this time, due to the linear speed of the conveying roller, the ply filament bundle is lower than that of the front roller. The speed is lower than the linear speed of the front roller, thus applying a pre-drafting effect to the ply filament bundle and controlling its elongation to a constant value, that is, controlling the content of the ply filament bundle in the composite yarn. The polyester-viscose blended roving obtained in the fifth step is fed into the back roller of the drafting system. After being drafted by the drafting system, it is pressed out by the front roller to obtain a polyester-viscose blended sliver. The pressing point of the ply filament bundle at the front roller is located at the center of the pressing point of the polyester-viscose blended sliver at the front roller. The polyester-viscose blended sliver and the ply filament bundle that are jointly output are twisted into a composite yarn under the action of the twisting twist on the spinning machine. In this process, the polyester-viscose blended sliver is twisted into a polyester-viscose blended yarn under the action of the twisting twist. During the twisting process, the ply filament bundle is wrapped in the center, thus obtaining a composite yarn in which the polyester-viscose blended yarn is the outer yarn and the ply filament bundle is the core yarn.

2. The method for producing composite core-spun yarn according to claim 1, characterized in that, In step (1), the polyester includes 70% Yizheng polyester and 28.4% Zha Shang Yi Xin polyester, and the viscose is Tangshan Sanyou viscose staple fiber.

3. The method for producing composite core-spun yarn according to claim 1, characterized in that, In step (4), the drafting ratio of the first drawing system is set between 8.3 and 8.

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4. The method for producing composite core-spun yarn according to claim 1, characterized in that, In step (4), the drafting ratio of the second drawing system is set between 8.6 and 8.

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5. The method for producing composite core-spun yarn according to claim 1, characterized in that, In step (4), the drawing process adopts centralized drafting, and the drafting system is pressurized by a spring cradle.

6. The method for producing composite core-spun yarn according to claim 1, characterized in that, In step (4), the back zone drafting ratio of the drawing system for the sliver is set between 1.2 and 2.0 times, and the middle zone is a fixed drafting ratio of 1.018 times.

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