Production method of moisture-permeable and warm-keeping composite fabric

Abstract

The invention discloses a production method of a moisture-permeable warm-keeping composite fabric. The production method comprises the following steps: selecting raw cotton; cotton mixing and plucking; cotton opening picking; cotton carding is conducted; cotton combing; multi-fiber mixed bale plucking; opening and picking the mixed fibers; carding the mixed fibers; drawing the mixed fibers; fiber roving is mixed; spinning; processing the compound fabric. Compared with the prior art, the paper yarn, the water-soluble vinylon filaments and the short fibers with excellent wearability are compounded in a multi-element mode, development of the composite yarn with the self-adaptive moisture permeability and heat retention property is achieved, and then development of the corresponding composite fabric is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of novel yarns, in particular to a method for producing a moisture-permeable and warm-keeping composite fabric. Background Art

[0002] With the development of social economy, people's living standards are constantly improving. For textiles used in clothing, in addition to the pursuit of wearing comfort, people are paying more and more attention to their fashion and functionality, pursuing unique styles and various functions, such as antibacterial and antistatic functions. In order to meet this demand of consumers, it has become an important task for the textile industry to continuously develop new yarns and fabrics. With the development of science and technology, the competition in the textile market is becoming more and more fierce. In order to maximize profits, various manufacturers are constantly developing in the direction of high-end, high-grade, good technical content and high added value.

[0003] Paper yarn is a new type of yarn with wood fiber as the main body, which is produced in a similar way to papermaking. It is produced in very small quantities in countries such as Japan and the Netherlands. Its advantages are light weight, the same feel as linen fabric, moisture-adjusting and odor-removing functions, and resistance to mildew and fleas, removal of harmful gases, and no static electricity. The disadvantage of paper yarn is that it is easy to break, so it is easy to break during the production process and after being made into thread material, making the production of paper yarn more difficult and the service life shorter. At the same time, paper yarn is easily affected by temperature when plying, resulting in low plying efficiency, which further reduces the service life. Therefore, how to structurally compound paper yarn with other short fiber or filament yarn so that the advantages of paper yarn can be fully utilized and the defects of paper yarn itself can be overcome has become one of the key directions for the development of this type of yarn. Summary of the invention

[0004] The purpose of the present invention is to provide a method for producing a moisture-permeable and heat-retaining composite fabric to solve the problems in the prior art.

[0005] The present invention provides a method for producing a moisture-permeable and heat-retaining composite fabric, comprising the following steps:

[0006] The selected cotton fibers are classified according to their origin as the main component, and mixed and grabbed by a mixed cotton plucking machine, and then sequentially blown, combed, and combed to obtain combed cotton fiber bundles, and the combed cotton fiber bundles and two or more selected synthetic fibers with excellent wearing properties are mixed and grabbed by a mixed cotton plucking machine, and the disc of the mixed cotton plucking machine is divided into corresponding arc parts, and the number of arc parts divided by the disc is the same as the number of origins of the selected cotton fibers, or one more than the number of types of the selected synthetic fibers;

[0007] A cotton grabbing device is arranged in each arc-shaped part, and each cotton grabbing device is connected to the corresponding cotton conveying branch pipeline. A fiber storage tank is arranged at one end of each cotton conveying branch pipeline. One side of the fiber storage tank is connected to the cotton conveying branch pipeline through an input door, and the other side is connected to the cotton conveying main pipeline through an output door. Both the input door and the output door are lift-controllable doors. When the input door is opened, the fibers grabbed by the cotton grabbing beater enter the fiber storage tank. When the fiber weight in the fiber storage tank reaches a set value, the input door is closed and the output door is opened at the same time, so that the fibers with the set weight in the fiber storage tank are transported into the cotton conveying main pipeline, so as to realize precise mixing ratio control of various selected fibers, and the grabbed mixed fibers are successively opened and combed to obtain mixed fiber strips, and then the mixed fiber strips are uniformly drawn through three passes to obtain mixed cooked strips, and then short-fiber blended rovings are obtained through roving. In the first spinning process, the cut paper strips and vinylon filaments are fed together to obtain center yarn. The composite core yarn is composed of vinylon and paper yarn as outer covering. In the second spinning process, the prepared composite core yarn and the short fiber blended roving are fed together to obtain a composite yarn with the composite core yarn as the center and the short fiber blended yarn as the outer covering. The fabric woven from the composite yarn is subjected to a hot water bath to dissolve the vinylon fiber in the center. While the vinylon is dissolved, the outer covering paper yarn in the composite core yarn absorbs moisture and expands after being heated and squeezed toward the center, so that the fabric continues to maintain its original state until the paper yarn is cooled and dried to obtain the desired composite fabric; when the outside temperature drops, the paper yarn contracts, so that the outside air enters the center of the hollow composite yarn under the action of the air pressure difference, and an air layer is formed in the composite yarn, so as to achieve the warming effect of the composite fabric; when the outside temperature and the humidity of the wearing environment rise, the paper yarn quickly absorbs moisture and expands after being heated, so as to achieve the rapid moisture absorption effect of the composite fabric, and the expanded paper yarn is squeezed toward the center of the composite yarn to squeeze out the air in the center, so that the fabric is fluffy and full, and a cool feeling is achieved when worn.

[0008] A method for producing a moisture-permeable and warm composite fabric as described above, wherein preferably, the mixed cotton picking machine includes a disc, the disc includes an outer disc and an inner disc, the outer disc and the inner disc are both hollow cylindrical structures with an open upper side, the outer disc and the inner disc form the disc for holding the fibers, a certain number of baffles are arranged in the disc, the baffles are arranged at equal arc intervals along the circumferential direction of the disc, each baffle divides the disc into a certain number of arc-shaped portions, and a cotton picking system is arranged on the upper part of each arc-shaped portion divided by the disc.

[0009] A method for producing a moisture-permeable and warm composite fabric as described above, wherein, preferably, the cotton grabbing system includes an arc-shaped outer shell, the outer shell is hollow and the lower side is open, the cross-section of the outer shell is an upwardly convex semicircle, the inner arc-shaped edge of the lower side of the outer shell is rotatably connected to the upper side edge of the inner disk of the arc-shaped part divided by the disc, the outer arc-shaped edge of the lower side of the outer shell is exactly the same as the upper side edge of the outer side disk of the arc-shaped part divided by the disc, the inner arc-shaped edge of the lower side of the outer shell is exactly the same as the upper side edge of the inner disk of the arc-shaped part divided by the disc, and when the outer shell is pressed down, the inner arc-shaped edge of the lower side of the outer shell is kept completely aligned with the upper side edge of the inner disk of the arc-shaped part divided by the disc, and the outer arc-shaped edge of the lower side of the outer shell is kept completely aligned with the upper side edge of the outer side disk of the arc-shaped part divided by the disc, and a fiber grabbing output port is opened at the center of the outer shell, and the fiber grabbing output port is connected to the cotton feeding port. The fiber conveying main pipeline is connected with the fiber conveying branch pipeline, and the other end of each cotton conveying branch pipeline is interconnected with the cotton conveying main pipeline. A fiber storage tank is arranged at the connection between each cotton conveying branch pipeline and the cotton conveying main pipeline, and the fiber storage tank is a rectangular hollow closed structure, wherein a fiber grabbing input door is installed on one side of the fiber storage tank, and the fiber storage tank is connected with the cotton conveying branch pipeline through the fiber grabbing input door, and a fiber grabbing output door is installed on the other side of the fiber storage tank, and the fiber storage tank is connected with the output branch pipeline through the fiber grabbing output door, and the output branch pipeline is connected with the cotton conveying main pipeline, and the cotton conveying main pipeline is interconnected with the machine of the previous process, and the fiber grabbing input door is driven to rise and fall by the conveying door motor to realize the opening and closing control of the fiber grabbing input door, and the fiber grabbing output door is driven to rise and fall by the conveying door motor to realize the opening and closing control of the fiber grabbing output door, and a pressure sensing device is arranged at the bottom of the fiber storage tank, and the cotton grabbing device is arranged in the outer shell.

[0010] A method for producing a moisture-permeable and thermal insulation composite fabric as described above, wherein preferably, the cotton-grabbing device includes a cotton-grabbing shell, the cotton-grabbing shell is hollow and the upper side is open, the cross-section of the cotton-grabbing shell is a downwardly convex semicircle, the geometric structure of the cotton-grabbing shell is the same as the geometric structure of the arc-shaped part of the disc, and the outer side surface of the cotton-grabbing shell is tightly attached to the inner side surface of the arc-shaped part of the disc, and fiber-feeding slits are opened at equal arc intervals along the arc direction of the lower side of the cotton-grabbing shell, and a certain number of fiber-grabbing beaters are arranged in the cotton-grabbing shell, and the fiber-grabbing beaters include a beater roller, and the beater roller is a solid cylindrical shape, and the two ends of the beater roller are divided into The beater roller is driven to rotate by a corresponding transmission mechanism, and fiber grabbing knife rings are arranged at equal length intervals along the length direction of the beater roller. The fiber grabbing knife ring comprises a certain number of fiber grabbing blades, and each of the fiber grabbing knife rings is arranged along the circumferential direction of the beater roller to form a fiber grabbing knife ring. The fiber grabbing blades of the fiber grabbing knife ring completely cover the circumferential direction of the beater roller, and the number of the fiber grabbing blades on each of the fiber grabbing knife rings gradually decreases from the outside to the inside along the length direction of the beater roller. A side edge of the open upper side of the cotton grabbing shell is connected to the shell through an elastic telescopic pin.

[0011] A method for producing a moisture-permeable and warm composite fabric as described above, wherein preferably, a modified cotton combing machine including a cotton feeding and nipper part, a combing part, and a separation and joining part is used in the combing, the cotton roll is fed through the cotton feeding and nipper part, the front end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the combing part, the rear end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the separation and joining part, and at the same time, the continuous output of the combed cotton fibers is achieved through the joining part, thereby obtaining a continuous combed cotton fiber bundle.

[0012] In the method for producing a moisture-permeable and heat-retaining composite fabric as described above, preferably, the synthetic fiber is lyocell fiber, or modal fiber, or cotton-type wool fiber, or cotton-type silk fiber, or cotton-type polyester fiber, or cotton-type acrylic fiber.

[0013] A method for producing a moisture-permeable and warm composite fabric as described above, wherein preferably, the first spun yarn adopts a ring spinning machine, and the transmission between the middle roller, the rear roller and the front roller of the ring spinning machine is disconnected, and the cut paper strips and the vinylon filaments are fed together through the front roller, and the feeding point of the vinylon filaments at the front roller is located at the center of the feeding point of the paper strips at the front roller, and the two are continuously output after being driven by the rotating front roller, and are immediately subjected to the action of twisting twist after output. Under the action of twisting twist, paper strips with a certain width are twisted into paper yarn, and the vinylon filaments are wrapped in the center during the twisting process to obtain a composite core yarn with vinylon in the center and paper yarn wrapped on the outside.

[0014] A method for producing a moisture-permeable and warm composite fabric as described above, wherein preferably, the second spun yarn adopts a ring spinning frame, and the composite core yarn and the short-fiber blended roving made of coarse yarn are fed together, and the short-fiber blended roving is fed through the rear roller of the drafting system, and then successively output after the middle roller and the front roller, so that it is subjected to the finishing drafting effect of the drafting multiple of the rear drafting zone between the rear roller and the middle roller within 1.1, and then subjected to the fine drafting effect of the drafting multiple of the front drafting zone between the middle roller and the front roller of more than 20, so as to obtain a twist-free and There are staple fiber mixed slivers of a certain width, which are continuously output through the front roller, and the composite core yarn is directly fed by the front roller, and the feeding point of the composite core yarn on the front roller is located at the center of the output point of the staple fiber mixed slivers on the front roller. The two are continuously output after being driven by the rotating front roller, and are immediately subjected to the effect of twisting twist after output. Under the effect of twisting twist, the staple fiber mixed slivers of a certain width are twisted into outer-wrapped staple fiber blended yarn, and the composite core yarn is wrapped in the center during the twisting process to obtain a composite yarn with the composite core yarn in the center and the outer-wrapped staple fiber blended yarn.

[0015] A method for producing a moisture-permeable and warm composite fabric as described above, wherein, preferably, in the cotton opening and cleaning, the grabbed cotton fibers are sequentially opened by a mixing cotton opener, and during the opening process, main mixing and auxiliary impurity removal of the cotton fibers are achieved, further opened and combed by a combing needle beater cotton opener, and during the opening process, main impurity removal and auxiliary mixing of the cotton fibers are achieved, opened by vibration by a vibrating cotton feeder, and during the vibration opening process, uniform transportation and impurity removal of the cotton fibers are achieved, and uniform cotton rolls are formed by a single beater roll forming machine.

[0016] A method for producing a moisture-permeable and thermal insulation composite fabric as described above, wherein, preferably, during the opening and cleaning of the mixed fibers, the grabbed fibers are sequentially passed through a differential multi-bin cotton mixer for further uniform mixing, and are further opened and combed by a porcupine-type cotton opener, and during the opening process, the fibers are removed from the cotton and mixed, and are formed into a uniform mixed roll by a single-beater roll forming machine; during the multi-bin cotton mixing process, based on the principle of sufficient mixing, the capacity of the multi-bin cotton mixer is increased, and the delay time is increased to achieve a better mixing effect, and during the porcupine-type cotton opening process, the mechanical part between the beater and the dust bar is relied on to complete the opening and impurity removal, and during the roll forming process, the mechanical parts between the beater and the dust bar are relied on to complete the opening and impurity removal.

[0017] Compared with the prior art, the present invention realizes the development of composite yarn with adaptive moisture permeability and warmth retention by multi-compounding paper yarn with water-soluble vinyl filament and short fiber with excellent wearing performance, and then realizes the development of corresponding composite fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the mixed cotton plucking machine of the present invention;

[0019] Figure 2 It is a schematic diagram of the cotton grabbing device of the present invention.

[0020] Explanation of the reference numerals: 1 - disc, 2 - outer disc, 3 - inner disc, 4 - baffle, 5 - outer shell, 6 - fiber grabbing output port, 7 - cotton delivery branch pipe, 8 - fiber storage tank, 9 - output branch pipe, 10 - fiber grabbing input door, 11 - fiber grabbing output door, 12 - cotton delivery main pipe, 13 - cotton grabbing shell, 14 - fiber inlet gap, 15 - beating roller, 16 - fiber grabbing knife ring, 17 - fiber grabbing blade, 18 - elastic telescopic pin. DETAILED DESCRIPTION

[0021] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

[0022] The present invention provides a method for producing a moisture-permeable and warm composite fabric, wherein selected cotton fibers are classified according to their origin as the main component, mixed and grabbed by a mixed cotton grabbing machine, and then sequentially subjected to opening, combing, and combing to obtain a combed cotton fiber clump, the combed cotton fiber clump and two or more selected synthetic fibers with excellent wearing performance are mixed and grabbed by a mixed cotton grabbing machine, a disc 1 of the mixed cotton grabbing machine is divided into corresponding arc-shaped parts, the number of arc-shaped parts divided by the disc 1 is the same as the number of origins of the selected cotton fibers, or one more than the number of types of the selected synthetic fibers, and a cotton grabbing device is arranged in each arc-shaped part Each cotton grabbing device is connected to the corresponding cotton feeding branch pipe 7, and a fiber storage tank 8 is arranged at one end of each cotton feeding branch pipe 7. One side of the fiber storage tank 8 is connected to the cotton feeding branch pipe 7 through an input door, and the other side is connected to the cotton feeding main line 12 through an output door. Both the input door and the output door are lift-controllable doors. When the input door is opened, the fiber grabbed by the cotton grabbing beater enters the fiber storage tank 8. When the fiber weight in the fiber storage tank 8 reaches a set value, the input door is closed and the output door is opened at the same time, so that the fiber with the set weight in the fiber storage tank 8 is transported into the cotton feeding main line 12, thereby realizing the precise selection of various fibers. The mixed fiber is picked up and processed in turn through opening, cleaning and combing to obtain mixed fiber strips, and then the mixed fiber strips are processed through three uniform drawing steps to obtain mixed cooked strips, and then processed through roving to obtain short-fiber blended roving. In the first spinning process, the cut paper strips are fed together with vinylon filaments to obtain a composite core yarn with vinylon as the center and paper yarn as the outer covering. In the second spinning process, the obtained core yarn is fed together with the short-fiber blended roving to obtain a composite yarn with a composite core yarn as the center and short-fiber blended yarn as the outer covering. The fabric woven from the composite yarn is placed in a hot water bath to dissolve the vinylon fiber in the center, and the outer covering paper in the composite core yarn is dissolved while the vinylon is dissolved. The yarn absorbs moisture and expands after being heated, thereby squeezing toward the center, so that the fabric continues to maintain its original state until the paper yarn is cooled and dried, thereby obtaining the desired composite fabric; when the outside temperature drops, the paper yarn contracts, so that the outside air enters the center of the hollow composite yarn under the action of the air pressure difference, and an air layer is formed in the composite yarn, thereby achieving the warmth-keeping effect of the composite fabric; when the outside temperature and the humidity of the wearing environment rise, the paper yarn quickly absorbs moisture and expands after being heated, thereby achieving the rapid moisture absorption effect of the composite fabric; the expanded paper yarn is squeezed toward the center of the composite yarn, and the air in the center is squeezed out, thereby making the fabric fluffy and full, thereby achieving a cool feeling when worn, comprising the following steps:

[0023] Step 1: Raw cotton selection. According to the performance requirements of the fabric, select raw cotton with a length of 28-29.8mm, a grade of 2-3, and a micronaire value of 3.4-5.0. The raw cotton should have good color, good uniformity, moderate maturity, few defects, and low short fiber rate. The principle of cotton matching is to put quality first, make comprehensive arrangements, take a comprehensive approach, ensure the key points, look ahead and behind, take a long-term approach, thoroughly understand both ends, and make reasonable arrangements. On the basis of classification, arrange the same type of raw materials into several teams, and arrange the raw cotton with relatively similar origins and technical indicators in one team, so that when one batch of raw materials is used up, it can be replaced by another batch of raw materials in the same team, so that the raw cotton in use can be used as the raw material. There is no obvious change in the characteristics of the yarn, so as to achieve the purpose of stable production and guaranteeing the quality of the yarn. To this end, the raw material queuing follows the following two points: First, the main component: in order to ensure the stability of the production process and the quality of the yarn, several raw materials with relatively close batch technical indicators are arranged as the main components in the cotton blending, with the origin as the main body, and the main components account for more than 70% of the total cotton blending; Second, the number of teams and the mixing percentage: the number of teams and the mixing ratio have a direct relationship. The more teams, the smaller the mixing ratio, and the fewer teams, the larger the mixing ratio. When the number of teams is too large, the production management is more difficult and it is easy to cause uneven mixing. When the number of teams is too small, the mixing is relatively large. When the batches are connected, it is easy to cause a large difference in the performance of the raw cotton. Considering comprehensively, 6-9 teams are selected.

[0024] Select polyester fibers with high strength, fine denier, few defects, fewer double-length fibers, average grade 2.6, average length 28.6mm, and impurity content of 1.72%.

[0025] Step 2: cotton mixed cotton grabbing, the selected cotton fibers are mixed and grabbed and accurately grabbed according to the required mixing ratio; the mixed cotton grabbing adopts a mixed cotton grabbing machine, the mixed cotton grabbing machine includes a disc 1, the disc 1 includes an outer disc 2 and an inner disc 33, the outer disc 2 and the inner disc 33 are both hollow cylindrical structures with open upper sides, the outer disc 2 and the inner disc 33 form a disc 1 for holding fibers, a certain number of baffles 4 are arranged in the disc 1, the baffles 4 are arranged at equal arc intervals along the circumferential direction of the disc 1, each baffle 4 divides the disc 1 into a certain number of arc parts, wherein the number of arc parts into which the disc 1 is divided is equal to the number of classifications of cotton fibers classified based on the origin as the main component, and a baffle 4 is arranged on the upper part of each arc part into which the disc 1 is divided. The cotton grasping system includes an arc-shaped shell 5, which is hollow and has an open lower side. The cross-section of the shell 5 is an upwardly convex semicircle. The inner arc-shaped edge of the lower side of the shell 5 is rotatably connected to the upper side of the inner disk 33 of the arc-shaped part divided by the disk 1. The outer arc-shaped edge of the lower side of the shell 5 is exactly the same as the upper side of the outer disk of the arc-shaped part divided by the disk 1. The inner arc-shaped edge of the lower side of the shell 5 is exactly the same as the upper side of the inner disk 33 of the arc-shaped part divided by the disk 1. When the shell 5 is pressed down, the inner arc-shaped edge of the lower side of the shell 5 is completely aligned with the upper side of the inner disk 33 of the arc-shaped part divided by the disk 1, and the outer arc-shaped edge of the lower side of the shell 5 is completely aligned with the upper side of the outer disk of the arc-shaped part divided by the disk 1. The sides are kept completely aligned, and a fiber grabbing output port 6 is opened at the center of the shell 5. The fiber grabbing output port 6 is connected to the cotton transport branch pipe 7. The other end of each cotton transport branch pipe 7 is interconnected with the cotton transport main line 12. A fiber storage tank 8 is arranged at the connection between each cotton transport branch pipe 7 and the cotton transport main line 12. The fiber storage tank 8 is a rectangular hollow closed structure, wherein a fiber grabbing input door 10 is added to one side of the fiber storage tank 8. The fiber storage tank 8 is connected to the cotton transport branch pipe 7 through the fiber grabbing input door 10. A fiber grabbing output door 11 is added to the other side of the fiber storage tank 8. The fiber storage tank 8 is connected to the output branch pipe 9 through the fiber grabbing output door 11. The output branch pipe 9 is connected to the cotton transport main line 12. The cotton transport main line 12 is interconnected with the machine of the previous process. The fiber input door 10 is driven to rise and fall by the conveying door motor, thereby realizing the control of opening and closing of the fiber grabbing input door 10, and the fiber grabbing output door 11 is driven to rise and fall by the conveying door motor, thereby realizing the control of opening and closing of the fiber grabbing output door 11. A pressure sensing device is arranged at the bottom of the fiber storage tank 8, and a cotton grabbing device is arranged in the outer shell 5. The cotton grabbing device includes a cotton grabbing shell 13. The cotton grabbing shell 13 is hollow and the upper side is open. The cross-section of the cotton grabbing shell 13 is a downward convex semicircle. The geometric structure of the cotton grabbing shell 13 is the same as the geometric structure of the arc-shaped part of the disc 1, and the outer side surface of the cotton grabbing shell 13 is tightly attached to the inner side surface of the arc-shaped part of the disc 1, and fiber feeding slits 14 are opened at equal arc intervals along the arc direction of the lower side of the cotton grabbing shell 13.A certain number of fiber grabbing beaters are arranged in the cotton grabbing shell 13. The fiber grabbing beaters include a beater roller 15. The beater roller 15 is in a solid cylindrical shape. The two ends of the beater roller 15 are rotatably connected to the outward side and the inward side of the cotton grabbing shell 13 respectively. The beater roller 15 is driven to rotate by a corresponding transmission mechanism. A fiber grabbing knife ring 16 is arranged at equal length intervals along the length direction of the beater roller 15. The fiber grabbing knife ring 16 includes a certain number of fiber grabbing blades 17. Each fiber grabbing blade 17 is arranged along the circumferential direction of the beater roller 15 to form the fiber grabbing knife ring 16. The fiber grabbing blades 17 of the fiber grabbing knife ring 16 completely cover the circumferential direction of the beater roller 15. The number of fiber grabbing blades 17 on each fiber grabbing knife ring 16 gradually decreases from the outside to the inside along the length direction of the beater roller 15. One side edge of the open upper side of the cotton grabbing shell 13 is connected to the outer shell 5 through an elastic telescopic pin 18.

[0026] When in use, the outer shell 5 of each cotton grabbing system is lifted up, so that the arc-shaped parts divided by the disc 1 are in an open state, and then different types of cotton fibers classified by origin are placed in the arc-shaped parts of the disc 1, and then the outer shell 5 of each cotton grabbing system is lowered, so that the outer shell 5 of the cotton grabbing system and the corresponding arc-shaped part of the disc 1 are kept in a closed connection, and at this time, the cotton grabbing outer shell 5 and the contained cotton fibers are kept pressed, and the pressure between the two is adaptively adjusted by the elastic telescopic pin 18, so that the cotton fibers can be pressed in the pressed state. The cotton fibers on the upper side are inserted into the cotton grabbing shell 13 through the fiber inlet slit 14, and the inserted cotton fibers are grabbed by the fiber grabbing blades 17 of the fiber grabbing knife ring 16 of the rotating fiber grabbing beater, and the preliminary loosening of the cotton fibers is achieved in the grabbing process. At this time, each fiber grabbing input door 10 is in an open state, and each fiber grabbing output door 11 is in a closed state. The grabbed cotton fibers are driven by the negative pressure airflow through the cotton conveying branch pipe 7 and enter the fiber storage tank 8, so that the weight of the cotton fibers in the fiber storage tank 8 continues to increase. When the pressure sensing device When the device detects that the weight of the cotton fibers in the fiber storage tank 8 reaches the set weight, the conveying door motor drives the fiber grabbing input door 10 to descend, so that the fiber grabbing input door 10 is closed, and the fiber grabbing beater stops working at the same time. When all the fiber grabbing input doors 10 are in the closed state, the fiber grabbing motor drives the fiber grabbing output door 11 to rise, so that all the fiber grabbing output doors 11 are in the open state. Under the action of the negative pressure airflow, the cotton fibers in each fiber storage tank 8 enter the cotton conveying main line 12 at the same time, thereby realizing the weight separation of the cotton fibers from each origin. The cotton fibers that enter the main cotton feeding channel 12 are then sent to the next machine; when the pressure sensing device detects that the fiber weight in the fiber storage tank 8 is zero again, the fiber grabbing motor drives the fiber grabbing output door 11 to descend, thereby closing the fiber grabbing output door 11; when all the fiber grabbing output doors 11 are in the closed state, the fiber grabbing motor drives the fiber grabbing input door 10 to rise, thereby making all the fiber grabbing input doors 10 open again, and at this time the fiber grabbing beaters start working at the same time, thereby continuing to grab the cotton fibers.

[0027] The third step: cotton opening and cleaning. The grabbed cotton fibers are opened by the mixed cotton opener in turn, and the main mixing and auxiliary impurity removal of the cotton fibers are achieved in the opening process. They are further opened and combed by the combing needle beater cotton opener, and the main impurity removal and auxiliary mixing of the cotton fibers are achieved in the opening process. They are vibrated and opened by the vibrating cotton feeder, and the cotton fibers are evenly transported and impurities are removed in the vibration opening process. They are formed into uniform cotton rolls by the single beater roll forming machine.

[0028] The fourth step: cotton combing. The cotton rolls obtained in the third step are carefully opened, combed, impurity-removed and made into slivers by the cotton carding machine. The cotton carding machine is mainly used for combing fibers. The cotton rolls made after the cotton opening and cleaning process are fed into the cotton carding machine. After opening, mixing, combing and impurity-removing, the curly fiber clusters are combed into basically straight single fibers, and the broken seeds, impurities and short fibers left over from the cotton cleaning process are removed. After being stretched, they are gathered into slivers of specifications and stored in the sliver cans.

[0029] The fifth step: cotton combing. The cotton strips obtained in the fourth step are successively processed by a drawing machine to obtain cotton pre-drawing with improved strip uniformity, and then processed by a strip drawing machine to obtain cotton rolls with a roll structure, and then processed by combing to obtain combed cotton fiber bundles. During the combing, a modified cotton combing machine including a cotton feeding and clamping plate part, a combing part, and a separation and joining part is used. The cotton rolls are fed through the cotton feeding and clamping plate part, and the front end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the combing part. The rear end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the separation and combination part. At the same time, the continuous output of the combed cotton fibers is achieved through the combination part, thereby obtaining a continuous combed cotton fiber bundle.

[0030] Step 6: Multi-fiber blending and grasping. The combed cotton fiber bundles obtained in the fifth step and two or more selected synthetic fibers with excellent wearing properties are blended and grasped accurately according to the required blending ratio. The selected synthetic fibers are lyocell fibers, modal fibers, cotton-type wool fibers, cotton-type silk fibers, cotton-type polyester fibers, or cotton-type acrylic fibers.

[0031] The mixed cotton plucking adopts a mixed cotton plucking machine, lifts the shell 5 of each cotton plucking system, so that the arc-shaped parts divided by the disc 1 are in an open state, and then the combed cotton fiber bundle and the selected synthetic fiber are placed in the arc-shaped parts of the disc 1 respectively, and then the shell 5 of each cotton plucking system is put down, so that the shell 5 of the cotton plucking system and the corresponding arc-shaped part of the disc 1 are kept in a closed connection, and at this time, the cotton plucking shell 5 and the contained fibers are kept pressed, and the pressure between the two is adaptively adjusted by the elastic telescopic pin 18. In the pressed state, the fibers on the upper side are extended into the cotton grabbing shell 13 through the fiber inlet slit 14, and the extended fibers are grabbed by the fiber grabbing blades 17 of the fiber grabbing knife ring 16 of the rotating fiber grabbing beater, and the preliminary loosening of the fibers is achieved in the grabbing process. At this time, each fiber grabbing input door 10 is in an open state, and each fiber grabbing output door 11 is in a closed state. The grabbed fibers enter the fiber storage tank 8 through the cotton conveying branch pipe 7 under the drive of the negative pressure airflow, so that the weight of the cotton fibers in the fiber storage tank 8 continues to increase. When the force sensing device detects that the fiber weight in the fiber storage tank 8 reaches the set weight, the conveying door motor drives the fiber grabbing input door 10 to descend, so that the fiber grabbing input door 10 is closed, and the fiber grabbing beaters stop working at the same time. When all the fiber grabbing input doors 10 are in a closed state, the fiber grabbing motor drives the fiber grabbing output door 11 to rise, so that all the fiber grabbing output doors 11 are in an open state. Under the action of the negative pressure airflow, the fibers in each fiber storage tank 8 enter the cotton conveying main passage 12 at the same time, and then various fibers are mixed according to their weight. The fibers entering the cotton conveying main passage 12 are then sent to the next machine. When the pressure sensing device re-detects that the fiber weight in the fiber storage tank 8 is zero again, the fiber grabbing motor drives the fiber grabbing output door 11 to descend, so that the fiber grabbing output door 11 is closed. When all the fiber grabbing output doors 11 are in a closed state, the fiber grabbing motor drives the fiber grabbing input door 10 to rise, so that all the fiber grabbing input doors 10 are opened again, and the fiber grabbing beaters start working at the same time, so as to continue to grab the fibers.

[0032] Step 7: Mixed fiber opening and cleaning. The grabbed fibers are further evenly mixed in turn through the differential multi-bin cotton mixer, further opened and combed by the porcupine cotton opener, and the fibers are removed and mixed during the opening process, and formed into a uniform mixed roll through the single beater roll forming machine; in the multi-bin cotton mixing process, according to the principle of full mixing, the capacity of the multi-bin cotton mixer is increased, and the delay time is increased to achieve a better mixing effect. In the porcupine cotton opening process, the mechanical part between the beater and the dust bar is relied on to complete the opening and impurity removal. In the roll forming process, the mechanical parts between the beater and the dust bar are relied on to complete the opening and impurity removal.

[0033] Step 8: Combing the mixed fibers. The mixed rolls obtained in step 7 are carefully opened, combed, cleaned and slitted by a carding machine to form mixed fiber strips.

[0034] The ninth step: drawing the mixed fibers. The mixed fiber strips obtained in the eighth step are drawn through three drawing stages to obtain mixed fiber strips with improved strip uniformity and fiber straightness. In the first drawing stage, six mixed fiber strips obtained in the eighth step are fed in. The fed mixed fiber strips are thinned by the drawing system in the drawing frame. At the same time, the fibers in the mixed fiber strips are straightened during the drawing process. The thinned mixed fiber strips are then combined again to obtain mixed fiber combined strips. Further fine mixing of various fibers is achieved during the combining process.

[0035] In the second drawing process, 8 mixed fiber strips are fed, and the mixed fiber strips fed are thinned under the stretching action of the stretching system in the drawing frame. At the same time, the fibers are straightened during the stretching process. The stretched mixed fiber strips are re-combined to obtain semi-cooked mixed fiber strips, thereby achieving more refined parallel mixing of the fibers in the combining process.

[0036] In the third drawing, 8 semi-mature mixed fiber strips are fed, and the 8 semi-mature mixed fiber strips are directly combined into semi-mature mixed fiber strips in the bell mouth. The weight distribution of the semi-mature mixed fiber strips in the length direction is more consistent through the combination. The semi-mature mixed fiber strips immediately enter the drawing system in the drawing frame, and the semi-mature mixed fiber strips are thinned under the drawing action, and the fibers are straightened in the process of thinning. After thinning, they enter the bell mouth again and are combined to obtain cooked mixed fiber strips, thereby achieving more refined parallel mixing of the fibers in the combining process.

[0037] Step 10: Mixed fiber roving: The mixed fiber sliver obtained in the ninth step is stretched and thinned by the drafting system of the roving frame and twisted and wound by the twisting system to obtain short-fiber blended roving with a certain strength. The stretching action of the roving frame continues to improve the straightness of the fiber, and the twisting makes the roving have a certain strength, thereby creating conditions for the large drafting of the spinning frame. The roving process design is mainly aimed at improving the quality of roving, so as to achieve stable elongation, small weight difference, uniform yarn dryness, compact structure and good forming; the roving frame should improve the quality of mechanical flat repair, normal engagement of the drafting gear, compliance with the regulations for the bending of the roller and the eccentricity of the rubber roller, and no oil shortage, the opening of the cotton collector is consistent and the installation position is appropriate, the rubber roller rotates flexibly, the starting position of the iron cannon is correct, the elongation is stable, the spindle shell is kept smooth, the operation is normal and the channel is free of hanging flowers, etc., thereby improving the yarn dryness of the roving, reducing the weight unevenness and reducing yarn defects.

[0038] Step 11: spun yarn, including a first spun yarn and a second spun yarn, wherein the first spun yarn adopts a ring spinning frame, and the transmission between the middle roller, the rear roller and the front roller of the ring spinning frame is disconnected, and the cut paper strips and the vinylon filaments are fed together through the front roller, and the feeding point of the vinylon filaments on the front roller is located at the center of the feeding point of the paper strips on the front roller, and the two are continuously output after being driven by the rotating front roller, and are immediately subjected to the effect of twisting twist after output. Under the effect of twisting twist, the paper strips with a certain width are twisted into paper yarn, and the vinylon filaments are wrapped in the center during the twisting process, thereby obtaining a composite core yarn with vinylon in the center and paper yarn wrapped on the outside.

[0039] The second spun yarn adopts a ring spinning frame, and the composite core yarn prepared is fed together with the short fiber blended roving prepared in the tenth step. The short fiber blended roving is fed through the rear roller of the drafting system, and then successively output through the middle roller and the front roller, so that it is subjected to the finishing drafting effect of the drafting multiple within 1.1 in the rear drafting zone between the rear roller and the middle roller, and then subjected to the fine drafting effect of the drafting multiple of more than 20 in the front drafting zone between the middle roller and the front roller, so as to obtain untwisted short fiber mixed whiskers with a certain width, and the short fiber whiskers The composite core yarn is directly fed by the front roller, and the feeding point of the composite core yarn on the front roller is located at the center of the output point of the staple fiber mixed yarn on the front roller. The two are continuously output after being driven by the rotating front roller. After output, they are immediately subjected to the effect of twisting twist. Under the effect of twisting twist, the staple fiber mixed yarn with a certain width is twisted into an outer staple fiber blended yarn, and the composite core yarn is wrapped in the center during the twisting process, thereby obtaining a composite yarn with the composite core yarn in the center and the outer staple fiber blended yarn.

[0040] Step 12: composite fabric processing, the composite yarn obtained in the eleventh step is woven into the required initial composite fabric, and the obtained initial composite fabric is placed in a hot water bath. Under the action of the hot water bath, the vinylon filaments in the center of the composite yarn gradually dissolve, and while the vinylon filaments dissolve, the outer paper yarn of the composite core yarn absorbs moisture and expands after being heated, thereby squeezing toward the center, and filling the space generated by the dissolution of the vinylon filaments during the squeezing, so that the initial composite fabric continues to maintain its original state until the vinylon filaments are completely dissolved, and the required composite fabric is obtained; when the outside temperature drops, the paper yarn contracts, so that the outside air enters the center of the hollow composite yarn under the action of the air pressure difference, and an air layer is formed in the composite yarn, so as to achieve the warmth-keeping effect of the composite fabric, and when the outside temperature rises and the humidity of the wearing environment rises, the paper yarn quickly absorbs moisture and expands after being heated, so as to achieve the rapid moisture absorption effect of the composite fabric, and the expanded paper yarn is squeezed toward the center of the composite yarn, and the air in the center is squeezed out, so that the fabric is fluffy and full, and a cool feeling is achieved when worn.

[0041] Taking the preparation of composite yarn of blended spun yarn with outer yarn density of 45S and blending ratio of JC60 / T40, paper yarn with linear density of 80S, and vinylon filament with linear density of 30dtex and its corresponding composite fabric as an example, the corresponding process parameters are as follows:

[0042] (1) Raw material selection:

[0043] Cotton fiber selection

[0044]

[0045]

[0046] Polyester fiber selection

[0047]

[0048] (2) The process flow is designed as follows

[0049] Raw cotton: Blowing → Combing → Pre-combing → Combing → Combing → Combing Polyester / Combed cotton: Blowing → Combing → First Combing → Second Combing → Third Combing → Roving Composite yarn: Spun yarn → Winding

[0050] Weaving: Multifunctional fully automatic knitting machine → hot water bath

[0051] (3) Design of key process parameters

[0052] Cotton opening and cleaning:

[0053] Mixed cotton plucking machine

[0054]

[0055] Mixed cotton opening machine

[0056]

[0057] Needle beater cotton opening machine

[0058]

[0059] Vibrating cotton feeder

[0060]

[0061] Single Beater Rolling Machine

[0062]

[0063] Cotton carding:

[0064]

[0065] Combed cotton:

[0066] Pre-drawing:

[0067]

[0068]

[0069] Strip and roll:

[0070]

[0071] Combing:

[0072]

[0073] Polyester / combed cotton opening and cleaning:

[0074] Mixed cotton plucking machine

[0075]

[0076]

[0077] Multi-bin cotton mixing machine

[0078]

[0079] Porcupine cotton opener

[0080]

[0081] Vibrating cotton feeder

[0082]

[0083] Single beater roll forming machine

[0084]

[0085] Polyester / Combed Cotton Combed Cotton:

[0086]

[0087] Polyester / combed cotton drawing:

[0088]

[0089] Polyester / combed cotton roving:

[0090]

[0091]

[0092] Polyester / combed cotton second spun yarn:

[0093]

[0094] Winding:

[0095]

[0096] (4) Yarn quality test

[0097]

[0098] The quality of the spun composite yarn was tested. It is obvious from the test results that the composite yarn processed by the method of the present invention has excellent yarn uniformity, strength, etc., that is, it has excellent overall yarn quality.

[0099] (5) Weaving:

[0100] The spun composite yarn was used to prepare a knitted fabric, and the machine parameters were: transverse density: 65 wales / 10cm, longitudinal density: 95 rows / 10cm, and surface density: 320g / m2. The processed knitted fabric was treated with a hot water bath to obtain the desired composite yarn fabric. The thermal conductivity, air permeability, and moisture permeability of the composite yarn fabric were tested. The test results are shown in the following table:

[0101] <![CDATA[Thermal resistance (m 2 ×K / W)]]> <![CDATA[Water vapor permeability (g / m 2 / 24h)]]> Air permeability (mm / s) 0.22 4701.36 4968.68

[0102] It is easy to see from the test results that the knitted fabric made of the spun composite yarn has excellent wearing performance, and its moisture permeability reaches the first-class requirements of FZ / T73016-2013 knitted thermal underwear, and its thermal resistance value exceeds the requirements for surface thermal resistance of clothing in the European EN342 standard.

[0103] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A method for producing a moisture-permeable and heat-retaining composite fabric, characterized in that: The following steps are involved: The selected cotton fibers are classified according to their origin as the main component, and mixed and grabbed by a mixed cotton plucking machine, and then sequentially blown, combed, and combed to obtain combed cotton fiber bundles, and the combed cotton fiber bundles and two or more selected synthetic fibers with excellent wearing properties are mixed and grabbed by a mixed cotton plucking machine, and the disc of the mixed cotton plucking machine is divided into corresponding arc parts, and the number of arc parts divided by the disc is the same as the number of origins of the selected cotton fibers, or one more than the number of types of the selected synthetic fibers; A cotton grabbing device is arranged in each arc-shaped part, and each cotton grabbing device is connected to the corresponding cotton conveying branch pipeline. A fiber storage tank is arranged at one end of each cotton conveying branch pipeline. One side of the fiber storage tank is connected to the cotton conveying branch pipeline through an input door, and the other side is connected to the cotton conveying main pipeline through an output door. Both the input door and the output door are lift-controllable doors. When the input door is opened, the fibers grabbed by the cotton grabbing beater enter the fiber storage tank. When the fiber weight in the fiber storage tank reaches a set value, the input door is closed and the output door is opened at the same time, so that the fibers with the set weight in the fiber storage tank are transported into the cotton conveying main pipeline, so as to realize precise mixing ratio control of various selected fibers, and the grabbed mixed fibers are successively opened and combed to obtain mixed fiber strips, and then the mixed fiber strips are uniformly drawn through three passes to obtain mixed cooked strips, and then short-fiber blended rovings are obtained through roving. In the first spinning process, the cut paper strips and vinylon filaments are fed together to obtain center yarn. The composite core yarn is composed of vinylon and paper yarn as outer covering. In the second spinning process, the prepared composite core yarn and the short fiber blended roving are fed together to obtain a composite yarn with the composite core yarn as the center and the short fiber blended yarn as the outer covering. The fabric woven from the composite yarn is subjected to a hot water bath to dissolve the vinylon fiber in the center. While the vinylon is dissolved, the outer covering paper yarn in the composite core yarn absorbs moisture and expands after being heated and squeezed toward the center, so that the fabric continues to maintain its original state until the paper yarn is cooled and dried to obtain the desired composite fabric; when the outside temperature drops, the paper yarn contracts, so that the outside air enters the center of the hollow composite yarn under the action of the air pressure difference, and an air layer is formed in the composite yarn, so as to achieve the warming effect of the composite fabric; when the outside temperature and the humidity of the wearing environment rise, the paper yarn quickly absorbs moisture and expands after being heated, so as to achieve the rapid moisture absorption effect of the composite fabric, and the expanded paper yarn is squeezed toward the center of the composite yarn to squeeze out the air in the center, so that the fabric is fluffy and full, and a cool feeling is achieved when worn.

2. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: The mixed cotton plucking machine includes a disc, which includes an outer disc and an inner disc. Both the outer disc and the inner disc are hollow cylindrical structures with open upper sides. The outer disc and the inner disc form the disc for holding fibers. A certain number of baffles are arranged inside the disc. The baffles are arranged at equal arc intervals along the circumferential direction of the disc. Each baffle divides the disc into a certain number of arc-shaped parts. A cotton plucking system is arranged on the upper part of each arc-shaped part divided by the disc.

3. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 2, characterized in that: The cotton grasping system includes an arc-shaped shell, which is hollow and has an open lower side. The cross-section of the shell is an upwardly convex semicircle. The inner arc-shaped edge of the lower side of the shell is rotatably connected to the upper side of the inner disk of the arc-shaped part divided by the disc, the outer arc-shaped edge of the lower side of the shell is exactly the same as the upper side of the outer side disk of the arc-shaped part divided by the disc, the inner arc-shaped edge of the lower side of the shell is exactly the same as the upper side of the inner disk of the arc-shaped part divided by the disc, and when the shell is pressed down, the inner arc-shaped edge of the lower side of the shell is kept completely aligned with the upper side of the inner disk of the arc-shaped part divided by the disc, and the outer arc-shaped edge of the lower side of the shell is kept completely aligned with the upper side of the outer side disk of the arc-shaped part divided by the disc, and a fiber grasping output port is opened at the center of the shell, and the fiber grasping output port is connected to the cotton transport branch pipeline, and each of the cotton transport branch pipelines The other end is interconnected with the cotton transport main pipeline, and a fiber storage tank is arranged at the connection between each of the cotton transport branch pipelines and the cotton transport main pipeline. The fiber storage tank is a rectangular hollow closed structure, wherein a fiber grabbing input door is installed on one side of the fiber storage tank, and the fiber storage tank is connected with the cotton transport branch pipeline through the fiber grabbing input door, and a fiber grabbing output door is installed on the other side of the fiber storage tank, and the fiber storage tank is connected with the output branch pipeline through the fiber grabbing output door, and the output branch pipeline is connected with the cotton transport main pipeline, and the cotton transport main pipeline is interconnected with the machine of the previous process, and the fiber grabbing input door is driven to rise and fall by the conveying door motor to realize the opening and closing control of the fiber grabbing input door, and the fiber grabbing output door is driven to rise and fall by the conveying door motor to realize the opening and closing control of the fiber grabbing output door, and a pressure sensing device is arranged at the bottom of the fiber storage tank, and the cotton grabbing device is arranged in the outer shell.

4. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 3, characterized in that: The cotton grabbing device includes a cotton grabbing shell, which is hollow and has an open upper side. The cross-section of the cotton grabbing shell is a downwardly convex semicircle. The geometric structure of the cotton grabbing shell is the same as the geometric structure of the arc-shaped part of the disc, and the outer side of the cotton grabbing shell is tightly attached to the inner side of the arc-shaped part of the disc. Fiber feeding slits are opened at equal arc intervals along the arc direction of the lower side of the cotton grabbing shell. A certain number of fiber grabbing beaters are arranged in the cotton grabbing shell, and the fiber grabbing beaters include a beater roller, which is a solid cylindrical shape, and the two ends of the beater roller are respectively connected to the outward side and The inward side surfaces are rotatably connected, and the beater roller is driven to rotate by a corresponding transmission mechanism. Fiber grabbing knife rings are arranged at equal length intervals along the length direction of the beater roller, and the fiber grabbing knife ring comprises a certain number of fiber grabbing blades, each of which is arranged along the circumferential direction of the beater roller to form a fiber grabbing knife ring. The fiber grabbing blades of the fiber grabbing knife ring completely cover the circumferential direction of the beater roller, and the number of the fiber grabbing blades on each of the fiber grabbing knife rings gradually decreases from the outside to the inside along the length direction of the beater roller, and one side edge of the open upper side of the cotton grabbing shell is connected to the shell through an elastic telescopic pin.

5. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: The combing process uses a modified cotton combing machine including a cotton feeding and nipper part, a combing part, and a separation and joining part. The cotton roll is fed through the cotton feeding and nipper part, and the front end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the combing part. The rear end hooks of the cotton fibers are combed and straightened, and the short fibers are separated and removed through the separation and joining part. At the same time, the combed cotton fibers are continuously output through the joining part, thereby obtaining a continuous combed cotton fiber bundle.

6. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: The synthetic fiber is lyocell fiber, modal fiber, cotton-type wool fiber, cotton-type silk fiber, cotton-type polyester fiber, or cotton-type acrylic fiber.

7. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: The first spun yarn adopts a ring spinning frame, and the transmission between the middle roller, the rear roller and the front roller of the ring spinning frame is disconnected, and the cut paper strips and the vinylon filaments are fed together through the front roller, and the feeding point of the vinylon filaments at the front roller is located at the center of the feeding point of the paper strips on the front roller. The two are continuously output after being driven by the rotating front roller, and are immediately subjected to the action of twisting twist after output. Under the action of twisting twist, paper strips with a certain width are twisted into paper yarn, and the vinylon filaments are wrapped in the center during the twisting process to obtain a composite core yarn with vinylon in the center and paper yarn wrapped on the outside.

8. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: The second spun yarn adopts a ring spinning frame, and the composite core yarn and the short fiber blended roving made of roving are fed together. The short fiber blended roving is fed through the rear roller of the drafting system, and then output after the middle roller and the front roller in sequence, so that it is subjected to the finishing drafting effect of the drafting multiple within 1.1 in the rear drafting zone between the rear roller and the middle roller, and then subjected to the thinning drafting effect of the drafting multiple of more than 20 in the front drafting zone between the middle roller and the front roller, so as to obtain untwisted short fiber mixed slivers with a certain width, and the short fiber blended slivers are fed through the rear roller of the drafting system, and then output after the middle roller and the front roller in sequence, so that the short fiber blended slivers are subjected to the finishing drafting effect of the drafting multiple within 1.1 in the rear drafting zone between the rear roller and the middle roller, and then subjected to the thinning drafting effect of the drafting multiple of more than 20 in the front drafting zone between the middle roller and the front roller, so as to obtain the short fiber mixed slivers with a certain width and without twist. The fiber strands are continuously output through the front roller, and the composite core yarn is directly fed by the front roller, and the feeding point of the composite core yarn on the front roller is located at the center of the output point of the staple fiber mixed strands on the front roller. The two are continuously output after being driven by the rotating front roller, and are immediately subjected to the effect of twisting twist after output. Under the effect of twisting twist, the staple fiber mixed strands with a certain width are twisted into outer wrapped staple fiber blended yarn, and the composite core yarn is wrapped in the center during the twisting process to obtain a composite yarn with the composite core yarn in the center and the staple fiber blended yarn on the outer surface.

9. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: In the cotton opening and cleaning, the grabbed cotton fibers are sequentially opened by a mixing cotton opener, and in the process of opening, main mixing and auxiliary impurity removal of the cotton fibers are achieved; they are further opened and combed by a combing needle beater cotton opener, and in the process of opening, main impurity removal and auxiliary mixing of the cotton fibers are achieved; they are vibrated and opened by a vibrating cotton feeder, and in the process of vibrating opening, uniform transportation and impurity removal of the cotton fibers are achieved; and they are formed into uniform cotton rolls by a single beater roll forming machine.

10. The method for producing a moisture-permeable and heat-retaining composite fabric according to claim 1, characterized in that: During the mixed fiber opening and cleaning, the grabbed fibers are sequentially passed through a differential multi-bin cotton mixer for further uniform mixing, and then further opened and combed by a porcupine-type cotton opener. In the process of opening, the fibers are removed from the cotton and mixed, and then formed into a uniform mixed roll by a single-beater roll forming machine. During the multi-bin cotton mixing process, based on the principle of sufficient mixing, the capacity of the multi-bin cotton mixer is increased, and the delay time is increased to achieve a better mixing effect. During the porcupine-type cotton opening process, the mechanical part between the beater and the dust bar is used to complete the opening and impurity removal. During the roll forming process, the mechanical parts between the beater and the dust bar are used to complete the opening and impurity removal.

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