A method for producing a paper composite yarn

Abstract

The application discloses a production method of paper-combined yarn, which comprises the following steps: first step, raw material selection; second step, opening and cleaning of outer wrapped short yarn; third step, carding of outer wrapped short yarn; fourth step, drawing and blending of outer wrapped short yarn; fifth step, even drawing of outer wrapped short yarn; sixth step, roving of outer wrapped short yarn; seventh step, fine spinning of combined yarn; and eighth step, bobbin winding of combined yarn. Compared with the prior art, the paper-combined yarn is produced by adopting wrapping and combining of paper yarn and polyester filament, so that the polyester filament with reinforcing rib effect is added at the center of the paper yarn, and the defects of easy breaking and low service life in the production process of the paper yarn are effectively overcome; and the core-wrapped combined yarn is made by combining with cotton and viscose short fibers, so that the developed combined yarn has excellent wearing performance, and the paper-combined yarn with excellent comprehensive yarn quality and wearing performance is developed.

Description

Technical Field

[0001] This invention relates to the field of novel yarn technology, and in particular to a method for producing washi paper composite 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.

[0003] Washi yarn is a new type of yarn primarily composed of wood fibers, produced using methods similar to papermaking. Currently, it is only produced in very small quantities in countries such as Japan and the Netherlands. Its advantages include light weight, a linen-like feel, moisture-wicking properties, odor control, resistance to mold and fleas, elimination of harmful gases, and no static electricity. However, washi yarn is prone to breakage during production and after being made into yarn, making its production difficult and its lifespan shorter. Furthermore, the twisting process is easily affected by temperature, resulting in low twisting efficiency and further reducing its lifespan. Therefore, developing a structural composite of washi yarn with other short-fiber or filament yarns to fully utilize its advantages while overcoming its inherent defects has become a key focus of current research and development. Summary of the Invention

[0004] The purpose of this invention is to provide a method for producing washi composite yarn, which develops washi composite yarn with excellent overall yarn quality and wearability by combining washi paper with polyester filament and cotton and viscose staple fibers.

[0005] This invention provides a method for producing washi paper composite yarn, comprising the following steps:

[0006] Step 1: Raw material selection: Lenzing viscose fiber with an average linear density of 1.3 dtex and an average length of 38 mm is selected. Each reel uses 8 packs of Lenzing viscose fiber, and is also equipped with 0.5 packs of polyester-viscose blend strips.

[0007] Selected from machine-harvested fine cotton fibers;

[0008] Washi yarn made from low-grammage Japanese washi paper, weighing no more than 23 grams;

[0009] Select ultra-fine denier polyester filaments with a linear density range of 55-444 dtex / 144-576 f and a strength of 5 cN / dtex or higher.

[0010] Step 2: Opening and cleaning the outer short fiber yarn: Selected cotton fibers and viscose fibers are sequentially processed through cotton grabbing, removal of metal impurities, multi-bin cotton blending, opening the cotton with comb needles, and cleaning the cotton rolls to obtain cotton rolls and viscose rolls.

[0011] Step 3: Carding the outer short fiber yarn: The cotton rolls and viscose rolls obtained in Step 2 are carefully opened, combed, impurities removed, and spun into cotton slivers and viscose slivers by a carding machine.

[0012] Step 4: Outer short fiber yarn drawing and blending: The viscose strip and cotton strip obtained in step 3 are directly processed into a cotton-viscose blended strip through a drawing and blending machine;

[0013] The drawing and blending machine includes a drawing system and a blending system. The drawing system includes a left drawing system and a right drawing system arranged laterally in parallel. Both systems contain the same number of pre-drawing devices, ranging from 4 to 10, arranged longitudinally in parallel alignment. Five to eight feed sliver cans, stacked vertically, with coiled adhesive strips, are drawn and combined by the pre-drawing devices of the left drawing system to produce a viscose pre-drawn sliver with improved evenness and fiber straightness. Similarly, five to eight feed sliver cans, stacked vertically, with coiled cotton slivers, are drawn and combined by the pre-drawing devices of the right drawing system to produce a cotton pre-drawn sliver with improved evenness and fiber straightness. The viscose pre-drawing slivers output from each pre-drawing unit of the drawing system and the cotton pre-drawing slivers output from each pre-drawing unit of the right drawing system are fed into the blending section via controllable guide rollers. The quantity and feeding position of the viscose and cotton pre-drawing slivers fed into the blending section are selected by controlling the rotation of the guide rollers, thereby controlling the blending ratio of the two. The draft ratio of all pre-drawing units in the left drawing system and all pre-drawing units in the right drawing system is adjusted by controlling the rotation speed of the guide rollers. The selected quantities of viscose and cotton pre-drawing slivers are drawn and combined in the blending section to produce a cotton-viscose blended sliver with improved evenness and fiber straightness.

[0014] Step 5: Uniformly draw the outer short fiber yarn: The cotton-viscose blend sliver obtained in step 4 is uniformly drawn to obtain a cotton-viscose finished sliver;

[0015] Step 6: Outer short fiber roving: The cotton viscose sliver obtained in step 5 is successively stretched and thinned by the drafting system of the roving frame and twisted and wound by the twisting system to obtain cotton viscose roving with a certain strength.

[0016] Step 7: Composite yarn fine yarn: Washi paper yarn and polyester filament are combined through a hollow spindle wrapping machine to obtain a composite core yarn in which washi paper yarn is wrapped around polyester filament;

[0017] The composite core yarn and cotton-viscose blended roving are processed together by a ring spinning machine to obtain a washi composite tube yarn with a composite core yarn in the center and a cotton-viscose blended yarn on the outside.

[0018] Step 8: Composite yarn winding: The washi composite tube yarn obtained in step 7 is wound into washi composite tube yarn by a winding machine.

[0019] In the method for producing washi composite yarn as described above, preferably, the pre-drawing device includes a sliver feeding device, which includes 5-9 feed slivers stacked vertically. Each feed sliver is mounted on a lifting frame, which includes a lifting plate. The lifting plate is a concave spherical fan shape. The number of lifting frames is the same as the number of slivers. Each lifting plate is arranged vertically aligned on the lifting frame, and each lifting plate is vertically connected to the lifting frame.

[0020] In the method for producing washi composite yarn as described above, preferably, a left guide rod is provided on the right side of the middle height portion of the feed sliver can of the pre-drawing device in the left drawing system, the length direction of the left guide rod being arranged longitudinally; a right guide rod is provided on the left side of the middle height portion of the feed sliver can of the pre-drawing device in the right drawing system, the length direction of the left guide rod being longitudinally arranged; guide wheel assemblies are respectively provided on the left guide rod and the right guide rod, the guide wheel assemblies being arranged at equal intervals along the length direction of the left guide rod or the right guide rod, and the number of guide wheels included in the guide wheel assembly being the same as the number of sliver cans included in the feed sliver can.

[0021] In the method for producing washi composite yarn as described above, preferably, a left pre-drawing drafting roller group is provided on the right side of the feed sliver can of the pre-drawing device in the left drawing system, and a right pre-drawing drafting roller group is provided on the left side of the feed sliver can of the pre-drawing device in the right drawing system. The left pre-drawing drafting roller group is horizontal with the left guide rod, and the right pre-drawing drafting roller group is horizontal with the right guide rod. The left and right pre-drawing drafting roller groups each contain 3-4 rows of drafting rollers. The drafting rollers of the left and right pre-drawing drafting roller groups are connected by gear transmission, and the drafting rollers of the right pre-drawing drafting roller groups are connected by gear transmission. The total draft ratio of the left and right pre-drawing drafting roller groups is 1%-10% higher than the number of sliver cans contained in the feed sliver can.

[0022] In the method for producing washi composite yarn as described above, preferably, a left guide roller group is provided on the right side of the left pre-drawing drafting roller group, and a right guide roller group is provided on the left side of the right pre-drawing drafting roller group. The left and right guide roller groups each include a lower guide roller and an upper guide roller. The lower guide roller of the left guide roller group of each pre-drawing device in the left drawing system is driven to rotate by a separate drawing drive motor. The drafting rollers of the left pre-drawing drafting roller group are connected to the... The lower guide rollers of the left guide roller group are connected by gear transmission, and there is no drafting effect between the left pre-drawing drafting roller group and the left guide roller group. The lower guide rollers of the left guide roller group of each pre-drawing device in the right draw system are driven to rotate by a separate draw drive motor. The drafting rollers of the right pre-drawing drafting roller group are connected by gear transmission to the lower guide rollers of the right guide roller group, and there is no drafting effect between the right pre-drawing drafting roller group and the right guide roller group.

[0023] In the method for producing washi paper composite yarn as described above, preferably, a left gathering flare is provided directly below each of the left guide roller groups, and a right gathering flare is provided directly below each of the right guide roller groups. The left gathering flare and the right gathering flare include an upper transverse gathering flare and a lower spatial gathering flare. The upper transverse gathering flare includes a base plate, the upper and lower sides of which are straight. The left side of the base plate is a rightward concave arc and the right side is a leftward concave arc. Corresponding arc plates are installed on the left and right sides of the base plate, thereby forming a slide with a gradually decreasing width between the left and right sides of the base plate. The lower spatial gathering flare is a hollow structure with open ends. The cross-section of the lower spatial gathering flare is elliptical, and the length of the major axis of the cross-section gradually decreases from top to bottom along the length direction of the lower spatial gathering flare while the length of the minor axis remains unchanged until the length of the major axis equals the length of the minor axis.

[0024] In the method for producing washi composite yarn as described above, preferably, the mixing section includes a pair of mixing and pressing rollers located directly below the middle portion of the left drawing system and the right drawing system. The mixing and pressing roller pair includes a left mixing and pressing roller and a right mixing and pressing roller, which are pressed tightly together. The left mixing and pressing roller is directly driven to rotate by a mixing motor, and the right mixing and pressing roller is connected to the mixing motor through a reversing gear set, so that the left and right mixing and pressing rollers rotate at the same speed but in opposite directions. A mixing flare is provided directly above the mixing and pressing roller pair. The mixing flare has the same structure as the left or right gathering flare, and the geometric dimensions of the mixing flare are larger than those of the left or right gathering flare.

[0025] In the method for producing washi composite yarn as described above, preferably, a mixing and drawing drafting roller group is provided directly below the mixing and pressing roller pair. The mixing and drawing drafting roller group includes 3-4 rows of drafting rollers, which are arranged vertically in parallel. The drafting rollers of the mixing and drawing drafting roller group are connected to each other by gear transmission. The mixing and drawing drafting roller group is also connected to the mixing motor by gear transmission, so that there is no drafting between the mixing and drawing drafting roller group and the mixing and pressing roller pair.

[0026] In the production method of washi composite yarn described above, preferably, in the process of using the outer short fiber yarn in the drawing and mixing process, the feed sliver cans with adhesive strips and cotton slivers obtained in the third step are first placed sequentially on the pre-drawing device of the left drawing system and the pre-drawing device of the right drawing system, respectively. During this process, the feed sliver cans are pushed onto a lifting plate of the lifting frame, and then the lifting plate is raised to the corresponding height, so that the feed sliver cans are stacked and arranged vertically on the lifting frame. Then the feed slivers are... After the viscose sliver wound inside the can extends out, it passes through the corresponding guide roller group on its guide rod and enters the pre-drawing drafting roller group of the left drawing system. Similarly, after the sliver wound inside the can extends out, it passes through the corresponding guide roller group on its guide rod and enters the pre-drawing drafting roller group of the right drawing system. The viscose sliver, after being drafted by the pre-drawing drafting roller group of the left drawing system, produces a viscose pre-drawn sliver with improved fiber straightness and a certain width. The sliver, after being drafted by the pre-drawing drafting roller group of the right drawing system, produces a fiber straightening... The cotton pre-drawing slivers with improved straightness and a certain width are produced. Each resulting viscose pre-drawing sliver is pressed and output between the lower and upper guide rollers of the left drawing system's guide roller group. After output, it enters the corresponding left gathering bell mouth, where it is first gathered in width and then spatially gathered to form a columnar viscose pre-drawing sliver. Each resulting cotton pre-drawing sliver is then pressed and output between the lower and upper guide rollers of the right drawing system's guide roller group. After output, they collectively enter the right drawing system's right... The cotton pre-drawing sliver is first gathered in width and then spatially within the right gathering funnel to obtain a columnar structure. During this process, the controlled rotation of the lower guide roller allows for selective feeding of the viscose and cotton pre-drawing slivers. Specifically, based on the blending ratio r, the quantitative amounts T1 of the viscose pre-drawing sliver and T2 of the cotton pre-drawing sliver are calculated, where M is a natural number greater than 1 and less than or equal to N. This means calculating the existence of natural numbers n1 and n2 such that... And n1 + n2 = M. Based on the calculated quantitative values and the quantitative values of the fed viscose sliver and cotton sliver, calculate the draft multiples of the pre-drawing roller groups of the left drawframe system and the right drawframe system. At the same time, according to the calculated required number of fed viscose pre-drawn slivers n1 and the number of cotton pre-drawn slivers n2, the programmable logic controller selects the corresponding number of motors to drive the guiding lower rollers to rotate, so as to realize the selective feeding of the viscose pre-drawn sliver and the cotton pre-drawn sliver. During the selection process, if n1 = n2, the code Li of the pre-drawn sliver device of the selected left drawframe system is kept discontinuous, and the code Rj of the pre-drawn sliver device of the selected right drawframe system is kept discontinuous. If n1 > n2, the code Li of the pre-drawn sliver device of the selected left drawframe system is kept maximally discontinuous, and the code Rj of the pre-drawn sliver device of the selected right drawframe system is kept discontinuous. If n1 < n2, the code Li of the pre-drawn sliver device of the selected left drawframe system is kept discontinuous, and the code Rj of the pre-drawn sliver device of the selected right drawframe system is kept maximally discontinuous. And at the same time, the combined code i of the pre-drawn sliver device of the selected left drawframe system and the code j of the pre-drawn sliver device of the selected right drawframe system are continuously increased from 1 to M. The cotton pre-drawn sliver converged and output through the right collecting trumpet and the viscose pre-drawn sliver converged and output through the left collecting trumpet then enter the mixing trumpet. In the mixing trumpet, the selected viscose pre-drawn sliver and cotton pre-drawn sliver are first closely adjacent along the width direction, so that the viscose pre-drawn sliver and cotton pre-drawn sliver are gathered while maintaining an interleaved arrangement state, and then the horizontal mixing of viscose and cotton fibers is realized. Then, they are gathered along the width direction and the thickness direction at the same time, so that the cotton / viscose mixed pre-drawn sliver is changed from a transverse planar structure arrangement to a columnar spatial structure arrangement, and then the spatial mixing of viscose and cotton fibers is realized. The gathered columnar cotton / viscose mixed pre-drawn sliver jointly enters the mixing pressing roller group. Under the close pressing between the left mixing pressing roller and the right mixing pressing roller that actively rotate at the same time in the mixing pressing roller group, the columnar cotton / viscose mixed pre-drawn sliver is changed into a planar structure. During the transformation process, polyester fibers and cotton fibers randomly transfer to each other, so as to realize the pressing and mixing effect of polyester fibers and cotton fibers. The planar cotton / viscose mixed pre-drawn sliver continuously enters the mixing drawframe drawing roller group under the drive of the mixing pressing roller group. Under the drawing effect that is 3% - 8% higher or 1% - 4% lower than the total number of fed cotton pre-drawn slivers and viscose pre-drawn slivers, the planar cotton / viscose mixed pre-drawn sliver is drawn thinner and then gathered through the output trumpet to obtain a cotton-viscose mixed sliver with improved evenness and fiber straightness. The cotton-viscose mixed sliver is continuously output after being pressed and driven by the left winding roller and the right winding roller of the winding roller pair. The output cotton-viscose mixed sliver passes through the mixing input port and the mixing output port of the winding disc in a tensioned state and then is continuously wound around the bobbin tube.

[0027] In the method for producing washi composite yarn as described above, preferably, the twist direction of the washi yarn wrapped around the polyester filament in the composite core yarn is consistent with the twist direction of the outer cotton-viscose blend yarn.

[0028] Compared with existing technologies, this invention overcomes the shortcomings of washi yarn, such as easy breakage and short lifespan, by wrapping and compounding washi yarn with polyester filaments, thereby adding polyester filaments with reinforcing ribs to the center of the washi yarn. Then, it is core-wrapped and compounded with blended yarn made of cotton and viscose staple fibers, so that the developed composite yarn has excellent wearing performance. Thus, the development of washi composite yarn with both excellent overall yarn quality and wearing performance is realized. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the sliver mixing machine of the present invention.

[0030] Explanation of reference numerals in the attached diagram: 1 - Left drawing system, 2 - Right drawing system, 3 - Lifting frame, 4 - Lifting plate, 5 - Feed canister, 6 - Left guide rod, 7 - Right guide rod, 8 - Guide roller assembly, 9 - Left pre-drawing drafting roller assembly, 10 - Right pre-drawing drafting roller assembly, 11 - Left guide roller assembly, 12 - Right guide roller assembly, 13 - Drawing drive motor, 14 - Left gathering bell mouth, 15 - Right gathering bell mouth, 16 - Upper transverse gathering bell mouth, 17 - Lower space gathering bell mouth, 18 - Mixing bell mouth, 19 - Mixing pressing roller pair, 20 - Mixing motor, 21 - Mixing drawing drafting roller assembly, 22 - Left winding roller, 23 - Right winding roller, 24 - Output bell mouth, 25 - Winding reel, 26 - Mixing input port, 27 - Mixing output port, 28 - Base, 29 - Output canister. Detailed Implementation

[0031] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] This invention provides a method for producing washi paper composite yarn. Selected viscose fibers and cotton fibers are sequentially processed by a cotton grabber for initial opening and mixing, then by a blending and opening machine for mixing and impurity removal, then by a further opening and impurity removal machine, and finally by a single-handed lap forming machine to form uniform viscose and cotton laps. These are then further processed by a carding machine for detailed opening, carding, impurity removal, and sliver forming to obtain strip-shaped viscose and cotton slivers. The viscose and cotton slivers are then directly processed by a drawing and blending machine to obtain a cotton-viscose blended sliver. The drawing and blending machine includes a drawing system and a blending system. The drawing system includes a left drawing system 1 and a right drawing system 2 arranged laterally in parallel. Five to eight viscose sliver windings placed vertically are drawn and blended by the left drawing system 11 to obtain a viscose pre-drawn sliver with improved evenness and fiber straightness. Five to eight cotton sliver windings placed vertically are then processed by the right drawing system 2. The drafting and combining process yields a cotton pre-drawing sliver with improved evenness and fiber straightness. The viscose pre-drawing sliver and cotton pre-drawing sliver are fed into the blending section via a controllable rotating guide roller. The controlled rotation of the guide roller allows for selective feeding of the quantity of viscose and cotton pre-drawing slivers, thereby controlling the blending ratio. The selected quantity of viscose and cotton pre-drawing slivers is then drafted and combined in the blending section to produce a cotton-viscose blended sliver with improved evenness and fiber straightness, thus achieving the integration of pre-drawing and blending. This shortens the spinning process and improves spinning efficiency. The resulting cotton-viscose blended sliver is then processed sequentially through uniform drawing and roving to produce a cotton-viscose roving. Washi yarn and polyester filament are combined through a hollow spindle covering mechanism to obtain a composite core yarn with washi yarn wrapped around polyester filament. The composite core yarn and cotton-viscose roving are then combined through a ring spinning fine spinning mechanism to obtain a washi composite yarn with a composite core yarn at the center and a cotton-viscose blended yarn on the outside.

[0033] The method for producing washi paper composite yarn of the present invention specifically includes the following steps:

[0034] Step 1: Raw material selection: Lenzing viscose fiber with an average linear density of 1.3 dtex and an average length of 38 mm is selected. Each reel uses 8 bales of Lenzing viscose fiber, along with 0.5 bales of polyester-viscose blended slivers; machine-harvested fine cotton fiber is selected; washi yarn made from Japanese washi paper with a weight of less than 23 grams is selected; ultra-fine denier polyester filament with a linear density range of 55-444 dtex / 144-576f and a strength of more than 5 cN / dtex is selected.

[0035] Step 2: Opening and Cleaning of Outer Short Fiber Yarn: The selected cotton fibers and viscose fibers are sequentially picked up by a cotton picker according to the blending ratio. During the picking process, the fibers are initially opened and mixed. A metal impurity removal device removes metal impurities contained in the fibers. The fibers are then mixed by the difference in movement path generated by the multi-compartment blending machine under different conveying paths. During the mixing process, the fibers are mixed and impurities are removed. The fibers are further opened by a carding and beating opener. During the opening process, the polyester fibers are cleaned and cleaned. The main functions of the fiber are impurity removal and auxiliary mixing. The fiber is formed into uniform viscose rolls and cotton rolls by the lap forming machine. The opening and cleaning process adopts the process principle of "more loosening and less beating, using combing instead of beating, more combing and less dropping". The operating rate of the cotton grabbing trolley in the cotton grabbing process should be increased. The beating hand of the cotton opener should use a combing needle beating hand to reduce the beating force and reduce fiber damage. In order to prevent the viscose roll or polyester roll from sticking together, the pressure of the pressing roller should be increased and the weight of the viscose roll or polyester roll should be reduced so that the fibers can be fully combed in the subsequent carding process.

[0036] Step 3: Carding of outer short fiber yarn: The cotton lap obtained in step 2 is finely opened, carded, impurities removed, and spun into slivers by a carding machine to obtain cotton slivers. The viscose lap obtained in step 2 is finely opened, carded, impurities removed, and spun into slivers by a carding machine to obtain viscose slivers. A flat-plate carding machine is selected. The carding process further opens the bundled cotton or viscose bundles obtained in the opening and cleaning process into single cotton fibers or single viscose fibers. At the same time, impurities and short fibers are removed, and the fibers are further mixed and output as slivers.

[0037] Step 4: Outer short fiber yarn drawing and blending: The viscose sliver and cotton sliver obtained in step 3 are directly processed into a cotton-viscose blend sliver using a drawing and blending machine, as described above. Figure 1As shown, the drawing and mixing machine includes a drawing system and a mixing system. The drawing system includes a left drawing system 1 and a right drawing system 2, which are arranged symmetrically. The left drawing system 1 includes N pre-drawing devices, and the right drawing system 2 includes N pre-drawing devices. The number of pre-drawing devices in the left drawing system 1 and the right drawing system 2 is the same, and N ranges from 4 to 10. Each pre-drawing device in the left drawing system 1 is sequentially coded as L1…LN along the arrangement direction. Each pre-drawing device in the right drawing system 2… The pre-drawing devices are sequentially coded as R1…RN along the same direction. Each pre-drawing device is arranged parallel to the longitudinal direction. One pre-drawing device in the left drawing system 1 and a corresponding pre-drawing device in the right drawing system 2 are arranged horizontally parallel to each other. Each pre-drawing device includes a can feeding device, which comprises 5-9 feeding cans 5 stacked vertically. Each feeding can 5 is mounted on a lifting frame 3. The lifting frame 3 includes a lifting plate 4, which is a concave spherical fan shape. The number of lifting frames 3 corresponds to the number of cans. Similarly, each lifting plate 4 is arranged vertically aligned on the lifting frame 3, and each lifting plate 4 is vertically connected to the lifting frame 3. A left guide rod 6 is provided on the right side of the middle height of the feed canister 5 of the pre-drawing device of the left drawing system 1, and the length direction of the left guide rod 6 is longitudinal. A right guide rod 7 is provided on the left side of the middle height of the feed canister 5 of the pre-drawing device of the right drawing system 2, and the length direction of the left guide rod 6 is longitudinal. Guide wheel assemblies 8 are respectively provided on the left guide rod 6 and the right guide rod 7. The guide roller group 8 is arranged at equal intervals along the length direction of the left guide rod 6 or the right guide rod 7. The number of guide rollers contained in the guide roller group 8 is the same as the number of sliver cans contained in the feed sliver can 5. A left pre-drawing drafting roller group 9 is provided on the right side of the feed sliver can 5 of the pre-drawing device of the left drawing system 1, and a right pre-drawing drafting roller group 10 is provided on the left side of the feed sliver can 5 of the pre-drawing device of the right drawing system 2. The left pre-drawing drafting roller group 9 is kept horizontal with the left guide rod 6, and the right pre-drawing drafting roller group 10 is kept horizontal with the right guide rod 7.

[0038] The left pre-drawing drafting roller group 9 and the right pre-drawing drafting roller group 10 each contain 3-4 rows of drafting rollers. The drafting rollers of the left pre-drawing drafting roller group 9 are connected by gear transmission, and the drafting rollers of the right pre-drawing drafting roller group 10 are also connected by gear transmission. The total draft ratio of the left and right pre-drawing drafting roller groups 9 and 10% is higher than the number of sliver cans contained in the feed can 5. A left guide roller group 11 is provided on the right side of the left pre-drawing drafting roller group 9, and a right guide roller group 12 is provided on the left side of the right pre-drawing drafting roller group 10. Guide roller group 11 and right guide roller group 12 include lower guide rollers and upper guide rollers. In the left drawing system 1, the lower guide roller of the left guide roller group 11 of each pre-drawing device is driven by a separate drawing drive motor 13. The drafting roller of the left pre-drawing drafting roller group 9 is connected to the lower guide roller of the left guide roller group 11 via gear transmission, and there is no drafting action between the left pre-drawing drafting roller group 9 and the left guide roller group 11. In the right drawing system 2, the lower guide roller of the left guide roller group 11 of each pre-drawing device is driven by a separate drawing drive motor 13. The right pre-drawing drafting roller group 12... The drafting rollers of the drawing roller group 10 and the lower guide rollers of the right guide roller group 12 are connected by gear transmission. There is no drafting action between the right pre-drawing drafting roller group 10 and the right guide roller group 12. All drawing drive motors 13 are connected to a programmable logic controller. A left gathering horn 14 is provided directly below each left guide roller group 11, and a right gathering horn 15 is provided directly below each right guide roller group 12. The left gathering horn 14 and right gathering horn 15 include an upper transverse gathering horn 16 and a lower spatial gathering horn 17. The upper transverse gathering horn... 16 includes a base plate, the upper and lower sides of which are straight. The left side of the base plate is a rightward concave arc and the right side is a leftward concave arc. Corresponding arc plates are installed on the left and right sides of the base plate, thereby forming a slide with a gradually decreasing width between the left and right sides of the base plate. The lower space converging horn 17 is a hollow structure with open ends. The cross-section of the lower space converging horn 17 is elliptical. Along the length direction of the lower space converging horn 17, the length of the major axis of the cross-section gradually decreases from top to bottom while the length of the minor axis remains unchanged until the length of the major axis equals the length of the minor axis.

[0039] The mixing section includes a mixing press roller pair 19, located directly below the middle section of the left drawing system 1 and the right drawing system 2. The mixing press roller pair 19 includes a left mixing press roller and a right mixing press roller, which are tightly pressed together. The left mixing press roller is directly driven by the mixing motor 20, while the right mixing press roller is connected to the mixing motor 20 via a reversing gear set, allowing the left and right mixing press rollers to rotate at the same speed but in opposite directions. A mixing bell mouth 18 is located directly above the mixing press roller pair 19, and the mixing bell mouth 18 connects with either the left or right gathering bell mouth 14. The structures of the openings 15 are identical, and the geometric dimensions of the mixing bell opening 18 are larger than those of the left assembly bell opening 14 or the right assembly bell opening 15. A mixing and drawing roller group 21 is arranged directly below the mixing pressing roller pair 19. The mixing and drawing roller group 21 contains 3-4 rows of drawing rollers, which are arranged vertically in parallel. The drawing rollers of the mixing and drawing roller group 21 are connected by gear transmission. The mixing and drawing roller group 21 is also connected to the mixing motor 20 by gear transmission, ensuring that there is no drawing between the mixing and drawing roller group 21 and the mixing pressing roller pair 19. A winding device is located directly below the sliver. The winding device includes a pair of winding rollers, a winding reel 25, and a sliver canister. The winding roller pair is positioned directly below the mixing and drawing roller assembly 21. The winding roller pair includes a left winding roller 22 and a right winding roller 23 that press against each other. An output bell-shaped opening 24 is located between the left and right winding rollers 22 and 23, extending between them. The mixing and drawing roller assembly 21 and the winding roller pair are connected by gear transmission, and the drafting ratio between the mixing and drawing roller assembly 21 and the winding roller pair is within 1.1 times. A winding reel 25 is located directly below the winding roller pair. The winding reel 25 is... The winding reel 25 is a hollow and closed cylindrical shape. The upper side center of the winding reel 25 has a mixing inlet 26 and the lower side has a mixing outlet 27. The mixing inlet 26 and the output horn 24 are vertically aligned. The mixing outlet 27 is spaced a certain distance from the center of the lower side. The winding reel 25 is driven to rotate by a corresponding transmission mechanism. The output strip tube 29 is set directly below the winding reel 25 and is set inside the base 28. The base 28 is a convex spherical fan shape. The base 28 is driven to rotate by a corresponding transmission mechanism. The rotational linear velocity of the base 28 is less than that of the winding reel. The rotational direction of the base 28 is the same as that of the winding reel.

[0040] In use, firstly, the feed sliver 5 with the adhesive strip wound on it and the feed sliver 5 with the cotton strip wound on it, obtained in step three, are placed sequentially on the pre-combining device of the left sliver system 1 and the pre-combining device of the right sliver system 2, respectively. During this process, the feed sliver 5 is pushed onto a lifting plate 4 of the lifting frame 3, and then the lifting plate 4 is raised to the corresponding height, so that the feed sliver 5 are stacked and arranged vertically on the lifting frame 3. Then, the end of the adhesive strip wound inside the feed sliver 5 is extended and passes through the corresponding guide rod. The guide roller group 8 enters the pre-drawing drafting roller group of the left drawing system 1. After the end of the sliver wound in the feed can 5 extends out, it enters the pre-drawing drafting roller group of the right drawing system 2 through the corresponding guide roller group 8 on the guide rod. After the viscose sliver is drawn by the pre-drawing drafting roller group of the left drawing system 1, a viscose pre-drawn sliver with improved fiber straightness and a certain width is obtained. After the cotton sliver is drawn by the pre-drawing drafting roller group of the right drawing system 2, a cotton pre-drawn sliver with improved fiber straightness and a certain width is obtained. The resulting pre-drawn slivers are pressed and output by the lower and upper guide rollers of the guide roller group in the left drawing system 1, and then enter the corresponding left gathering bell mouth 14. Within the left gathering bell mouth 14, they are first gathered in width and then spatially gathered to form a columnar structure of the pre-drawn sliver. The resulting cotton pre-drawn slivers are pressed and output by the lower and upper guide rollers of the guide roller group in the right drawing system 2, and then collectively enter the right gathering bell mouth 15 of the right drawing system 2. Furthermore, within the right gathering flared opening 15, the cotton pre-drawing sliver is first gathered in width and then in space to obtain a columnar structure. During this process, the controlled rotation of the lower guide roller enables the selective feeding of the number of viscose pre-drawing slivers and cotton pre-drawing slivers. That is, firstly, based on the blending ratio r, the quantitative T1 of viscose pre-drawing sliver and the quantitative T2 of cotton pre-drawing sliver are calculated, where the sum of the number of slivers is M, and M is a natural number greater than 1 and less than or equal to N. In other words, it is calculated that there exist natural numbers n1 and n2 such that... And \(n1 + n2 = M\). Based on the calculated quantitative values and the quantitative values of the fed viscose strips and cotton strips, calculate the draft multiples of the pre-drawing roller groups of the left drawframe system 1 and the right drawframe system 2 required. At the same time, according to the calculated required number \(n1\) of fed viscose pre-drawn strips and the number \(n2\) of cotton pre-drawn strips, the programmable logic controller selects the corresponding number of motors to drive the guiding lower rollers to rotate, so as to achieve the selective feeding of the viscose pre-drawn strips and cotton pre-drawn strips. During the selection process, if \(n1 = n2\), then make the code \(Li\) of the pre-drawn strip device of the selected left drawframe system 1 discontinuous, and the code \(Rj\) of the pre-drawn strip device of the selected right drawframe system 2 discontinuous. If \(n1>n2\), then make the code \(Li\) of the pre-drawn strip device of the selected left drawframe system 1 have the largest discontinuity, and the code \(Rj\) of the pre-drawn strip device of the selected right drawframe system 2 discontinuous. If \(n1 < n2\), then make the code \(Li\) of the pre-drawn strip device of the selected left drawframe system 1 discontinuous, and the code \(Rj\) of the pre-drawn strip device of the selected right drawframe system 2 have the largest discontinuity. And at the same time, make the code \(i\) of the pre-drawn strip device of the selected left drawframe system 1 and the code \(j\) of the pre-drawn strip device of the selected right drawframe system 2 increase continuously from 1 to \(M\) after being combined. The cotton pre-drawn strips converged and output through the right collecting nozzle 15 and the viscose pre-drawn strips converged and output through the left collecting nozzle 14 then enter the mixing nozzle 18. The selected viscose pre-drawn strips and cotton pre-drawn strips in the mixing nozzle 18 are first closely adjacent along the width direction, so that the viscose pre-drawn strips and cotton pre-drawn strips gather while maintaining an interlaced arrangement state, and then the horizontal mixing of the viscose and cotton fibers is realized. Then, they gather along the width direction and the thickness direction at the same time, so that the viscose pre-drawn strips and cotton pre-drawn strips are changed from a transverse planar structure arrangement to a columnar spatial structure arrangement of cotton / viscose mixed pre-drawn strips, and then the spatial mixing of the viscose and cotton fibers is realized. The gathered columnar cotton / viscose mixed pre-drawn strips enter the mixing pressing roller group together. Under the tight pressing between the left mixing pressing roller and the right mixing pressing roller that rotate actively at the same time in the mixing pressing roller group, the columnar cotton / viscose mixed pre-drawn strips are changed into a planar structure. During the transformation process, the polyester fibers and cotton fibers randomly transfer to each other, so as to realize the pressing and mixing effect of the polyester fibers and cotton fibers. The planar cotton / viscose mixed pre-drawn strips continuously enter the mixing drawframe drawing roller group 21 under the drive of the mixing pressing roller group. Under the drawing effect of the mixing drawframe drawing roller group 21 that is 3% - 8% higher or 1% - 4% lower than the total number of the fed cotton pre-drawn strips and viscose pre-drawn strips, the planar cotton / viscose mixed pre-drawn strips are drawn thinner and then converged through the output nozzle 24 to obtain a cotton-viscose mixed strip with improved sliver evenness and fiber straightness. The cotton-viscose mixed strip is continuously output after being pressed and driven by the left winding roller 22 and the right winding roller 23 of the winding roller pair. The output cotton-viscose mixed strip passes through the mixing input port 26 and the mixing output port 27 of the winding disk 25 in a tensioned state and then continuously winds around the bobbin.

[0041] Step 5: Uniform drawing of outer short fiber yarn: The cotton-viscose blend sliver obtained in step 4 is uniformly drawn to obtain a cotton-viscose finished sliver. Eight cotton-viscose blend slivers obtained in step 4 are fed together and drawn thin by the drawing system of the drawing frame, and then re-drawn to obtain a cotton-viscose finished sliver. In this process, the fibers in the cotton-viscose blend sliver are further straightened by the drawing and thinning of the drawing frame. The re-drawing after thinning achieves a more uniform mixing of cotton and viscose fibers, and at the same time, the evenness of the sliver is improved during the drawing process.

[0042] Step 6: Outer short fiber roving: The cotton viscose sliver obtained in step 5 is sequentially drawn and twisted by the drafting system and twisting system of the roving frame to produce cotton viscose roving with a certain strength. A spindle roving frame is selected. The selection of the roving twist coefficient in the twisting system is mainly based on the spun variety, fiber length and roving quantity. It should also take into account factors such as temperature and humidity conditions, the purpose of the fine yarn, the fine yarn backing process, and roving breakage. In actual production, the selection of roving twist mainly considers the roving strength. The roving strength must ensure normal fine yarn drafting and avoid phenomena such as excessive strength resulting in insufficient drafting or insufficient strength resulting in too small an additional friction boundary and uneven drafting.

[0043] Step 7: Composite Yarn Spinning: Washi yarn and polyester filament are combined using a hollow spindle wrapping machine to obtain a composite core yarn with washi yarn wrapped around the polyester filament. The bobbin wrapped with washi yarn is placed on the hollow spindle, and the polyester filament is fed in without drafting through a drafting device. Under the action of the rotating hollow spindle, the washi yarn is wrapped around the polyester filament in a Z-twist direction. Then, the resulting composite core yarn is combined with cotton-viscose blended roving and spun together using a ring spinning machine to obtain a washi composite tube yarn with a composite core yarn at the center and a cotton-viscose blended yarn on the outside. The cotton-viscose roving obtained in Step 6 is fed into the back roller pair of the drafting system of the spinning machine. The fed cotton-viscose roving passes sequentially between the back roller pair and the middle roller pair. After the back zone drafting process, a cotton-viscose sliver with a certain width is obtained through the drafting process of the front drafting zone between the middle roller pair and the front roller pair. The composite core yarn is directly fed into the front roller pair of the drafting system, and the feeding point of the composite core yarn on the front roller pair is located at the center of the cotton-viscose sliver. The cotton-viscose sliver and the composite core yarn are continuously output together by the front roller pair. The output cotton-viscose sliver and the composite core yarn are made into washi paper composite tube yarn under the action of the twisting in the Z-twist direction transmitted from above. During this process, under the action of the twisting in the Z-twist direction, the fibers in the output cotton-viscose sliver transfer and intertwine with each other to obtain cotton-viscose blended yarn, and the composite core yarn output at the same time is wrapped in the middle during the intertwining process.

[0044] Step 8: Composite Yarn Winding: The washi composite bobbin yarn obtained in Step 7 is wound into washi composite bobbin yarn through a winding machine. During the winding process, the fine yarn is unwound and rewound onto a larger capacity bobbin, thereby improving the production efficiency of subsequent processes and facilitating storage and transportation. At the same time, harmful defects on the yarn are removed during the winding process, improving yarn quality. A Savio-Loepfe type electronic yarn clearer is used, employing capacitive sensor technology and microelectronic technology. Through central processing of detection signals, data related to yarn quality is obtained and processed, and defects that meet the set conditions are removed to ensure yarn quality.

[0045] Taking the preparation of a composite yarn with an outer yarn linear density of 20S and a blending ratio of C65 / R35, and a composite core yarn with a linear density of 40S as an example, the polyester filament is selected as 60dtex / 155f, and the corresponding process parameters are as follows:

[0046] (1) Raw material selection

[0047] Cotton with cotton watch

[0048]

[0049] Viscose cotton fabric

[0050]

[0051] Key performance indicators of selected viscose fibers

[0052]

[0053]

[0054] Key performance indicators of selected cotton fibers

[0055]

[0056] (2) The process flow design is as follows

[0057] Adhesive: Opening and cleaning cotton → Carding

[0058] Cotton: Opening and cleaning → Carding; Cotton-viscose blend: Drawing and blending → Even drawing → Roving; Composite yarn: Spinning → Winding

[0059] (3) Design of key process parameters

[0060] Quantitative setting:

[0061]

[0062]

[0063] Opening and cleaning cotton:

[0064] Rolling machine

[0065]

[0066] Other key parameters of the cleaning process

[0067] raw material Overall hitter speed Fan speed Cotton Roll Roll cotton 950 1375 12 adhesive 825 1380 12

[0068] Combing:

[0069]

[0070]

[0071] Drawing and mixing – Drawing system:

[0072]

[0073] Blending-mixing system:

[0074]

[0075]

[0076] Uniformly drawn strips:

[0077]

[0078] Coarse yarn:

[0079]

[0080] Fine yarn:

[0081]

[0082]

[0083] Winding tube:

[0084]

[0085] (4) Yarn quality testing

[0086]

[0087]

[0088] The quality of the spun washi composite yarn was tested, and the test results clearly show that the washi composite yarn processed using this patented method has excellent yarn evenness, strength, etc., which means it has excellent overall yarn quality, especially yarn strength. Because this patent adds polyester filaments with reinforcing ribs to the center of the washi yarn, it effectively overcomes the shortcomings of washi yarn being easy to break and having a short lifespan.

[0089] (5) Fabric quality testing:

[0090] Knitted fabrics were prepared using the spun composite yarn. The machine parameters were: warp density: 60 rows / 10cm, warp density: 100 rows / 10cm, and areal density: 330g / m2. The thermal conductivity, air permeability, and moisture permeability of the processed knitted fabrics were tested, and the test results are shown in the table below.

[0091] <![CDATA[Thermal resistance (m 2 ×K / W)]]> <![CDATA[Water vapor permeability (g / m 2 / h)]]> Air permeability (mm / s) 0.16 140.16 4246.78

[0092] The test results clearly show that the knitted fabrics made from the composite yarn have excellent performance characteristics, and their thermal resistance values ​​meet the requirements for surface thermal resistance of clothing in the European EN342 standard.

[0093] The above description, based on the embodiments shown in the figures, 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 is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A method for producing washi paper composite yarn, characterized in that, Includes the following steps: Step 1: Raw material selection: Lenzing viscose fiber with an average linear density of 1.3 dtex and an average length of 38 mm is selected. Each reel uses 8 packs of Lenzing viscose fiber and is equipped with 0.5 packs of cotton-viscose blend strips. Selected from machine-harvested fine cotton fibers; Washi yarn made from low-grammage Japanese washi paper, weighing no more than 23 grams; Select ultra-fine denier polyester filaments with a linear density range of 55-444 dtex / 144-576 f and a strength of 5 cN / dtex or higher. Step 2: Opening and cleaning the outer short fiber yarn: Selected cotton fibers and viscose fibers are sequentially processed through cotton grabbing, removal of metal impurities, multi-bin cotton blending, opening the cotton with comb needles, and cleaning the cotton rolls to obtain cotton rolls and viscose rolls. Step 3: Carding the outer short fiber yarn: The cotton rolls and viscose rolls obtained in Step 2 are carefully opened, combed, impurities removed, and spun into cotton slivers and viscose slivers by a carding machine. Step 4: Outer short fiber yarn drawing and blending: The viscose strip and cotton strip obtained in step 3 are directly processed into a cotton-viscose blended strip through a drawing and blending machine; The drawing and blending machine includes a drawing system and a blending system. The drawing system includes a left drawing system and a right drawing system arranged laterally in parallel. Both systems contain the same number of pre-drawing devices, ranging from 4 to 10, arranged longitudinally in parallel alignment. Five to eight feed sliver cans, stacked vertically, with coiled adhesive strips, are drawn and combined by the pre-drawing devices of the left drawing system to produce a viscose pre-drawn sliver with improved evenness and fiber straightness. Similarly, five to eight feed sliver cans, stacked vertically, with coiled cotton slivers, are drawn and combined by the pre-drawing devices of the right drawing system to produce a cotton pre-drawn sliver with improved evenness and fiber straightness. The viscose pre-drawing slivers output from each pre-drawing unit of the drawing system and the cotton pre-drawing slivers output from each pre-drawing unit of the right drawing system are fed into the blending section via controllable guide rollers. The quantity and feeding position of the viscose and cotton pre-drawing slivers fed into the blending section are selected by controlling the rotation of the guide rollers, thereby controlling the blending ratio of the two. The draft ratio of all pre-drawing units in the left drawing system and all pre-drawing units in the right drawing system is adjusted by controlling the rotation speed of the guide rollers. The selected quantities of viscose and cotton pre-drawing slivers are drawn and combined in the blending section to produce a cotton-viscose blended sliver with improved evenness and fiber straightness. Step 5: Uniformly draw the outer short fiber yarn: The cotton-viscose blend sliver obtained in step 4 is uniformly drawn to obtain a cotton-viscose finished sliver; Step 6: Outer short fiber roving: The cotton viscose sliver obtained in step 5 is successively stretched and thinned by the drafting system of the roving frame and twisted and wound by the twisting system to obtain cotton viscose roving with a certain strength. Step 7: Composite yarn fine yarn: Washi paper yarn and polyester filament are combined through a hollow spindle wrapping machine to obtain a composite core yarn in which washi paper yarn is wrapped around polyester filament; The composite core yarn and cotton-viscose blended roving are processed together by a ring spinning machine to obtain a washi composite tube yarn with a composite core yarn in the center and a cotton-viscose blended yarn on the outside. Step 8: Composite yarn winding: The washi composite tube yarn obtained in step 7 is wound into washi composite tube yarn by a winding machine.

2. The method for producing washi paper composite yarn according to claim 1, characterized in that: The pre-coupling device includes a strip can feeding device, which includes 5-9 feeding strip cans stacked vertically. Each feeding strip can is mounted on a lifting frame. The lifting frame includes a lifting plate, which is a concave spherical fan shape. The number of lifting frames is the same as the number of strip cans. Each lifting plate is arranged vertically aligned on the lifting frame, and each lifting plate is vertically connected to the lifting frame.

3. The method for producing washi paper composite yarn according to claim 1, characterized in that: A left guide rod is provided on the right side of the middle height portion of the feed can of the pre-drawing device in the left drawing system. The length direction of the left guide rod is longitudinal. A right guide rod is provided on the left side of the middle height portion of the feed can of the pre-drawing device in the right drawing system. The length direction of the left guide rod is longitudinal. Guide wheel assemblies are respectively provided on the left guide rod and the right guide rod. The guide wheel assemblies are arranged at equal intervals along the length direction of the left guide rod or the right guide rod. The number of guide wheels included in the guide wheel assembly is the same as the number of cans included in the feed can.

4. The method for producing washi paper composite yarn according to claim 1, characterized in that: A left pre-drawing drafting roller group is provided on the right side of the feed can of the pre-drawing device in the left drawing system, and a right pre-drawing drafting roller group is provided on the left side of the feed can of the pre-drawing device in the right drawing system. The left pre-drawing drafting roller group is horizontal with the left guide rod, and the right pre-drawing drafting roller group is horizontal with the right guide rod. The left and right pre-drawing drafting roller groups each contain 3-4 rows of drafting rollers. The drafting rollers of the left and right pre-drawing drafting roller groups are connected by gear transmission, and the drafting rollers of the right pre-drawing drafting roller group are also connected by gear transmission. The total drafting ratio of the left and right pre-drawing drafting roller groups is 1%-10% higher than the number of cans contained in the feed can.

5. The method for producing washi paper composite yarn according to claim 4, characterized in that: A left guide roller group is provided on the right side of the left pre-drawing drafting roller group, and a right guide roller group is provided on the left side of the right pre-drawing drafting roller group. The left and right guide roller groups each include a lower guide roller and an upper guide roller. The lower guide roller of the left guide roller group of each pre-drawing device in the left drawing system is driven by a separate drawing drive motor. The drafting roller of the left pre-drawing drafting roller group is connected to the lower guide roller of the left guide roller group via gear transmission, and there is no drafting effect between the left pre-drawing drafting roller group and the left guide roller group. Similarly, the lower guide roller of the left guide roller group of each pre-drawing device in the right drawing system is driven by a separate drawing drive motor. The drafting roller of the right pre-drawing drafting roller group is connected to the lower guide roller of the right guide roller group via gear transmission, and there is no drafting effect between the right pre-drawing drafting roller group and the right guide roller group.

6. The method for producing washi paper composite yarn according to claim 5, characterized in that: A left gathering horn is provided directly below each of the left guide roller groups, and a right gathering horn is provided directly below each of the right guide roller groups. The left and right gathering horns include an upper transverse gathering horn and a lower spatial gathering horn. The upper transverse gathering horn includes a base plate. The upper and lower sides of the base plate are both straight. The left side of the base plate is a rightward concave arc and the right side is a leftward concave arc. Corresponding arc plates are installed on the left and right sides of the base plate, thereby forming a slide with a gradually decreasing width between the left and right sides of the base plate. The lower spatial gathering horn is a hollow structure with openings at both ends. The cross-section of the lower spatial gathering horn is elliptical, and the length of the major axis of the cross-section gradually decreases from top to bottom along the length direction of the lower spatial gathering horn while the length of the minor axis remains unchanged until the length of the major axis equals the length of the minor axis.

7. The method for producing washi paper composite yarn according to claim 6, characterized in that: The mixing section includes a mixing pressing roller pair located directly below the middle portion of the left and right drawing systems. The mixing pressing roller pair includes a left mixing pressing roller and a right mixing pressing roller, which are pressed tightly together. The left mixing pressing roller is directly driven by the mixing motor, and the right mixing pressing roller is connected to the mixing motor through a reversing gear set, so that the left and right mixing pressing rollers rotate at the same speed but in opposite directions. A mixing flare is provided directly above the mixing pressing roller pair. The mixing flare has the same structure as the left or right gathering flare, and the geometric dimensions of the mixing flare are larger than those of the left or right gathering flare.

8. The method for producing washi paper composite yarn according to claim 7, characterized in that: A mixing and drawing roller group is arranged directly below the mixing and pressing roller pair. The mixing and drawing roller group includes 3-4 rows of drawing rollers, which are arranged vertically in parallel. The drawing rollers of the mixing and drawing roller group are connected to each other by gear transmission. The mixing and drawing roller group is also connected to the mixing motor by gear transmission, so that there is no drawing between the mixing and drawing roller group and the mixing and pressing roller pair.

9. The method for producing washi paper composite yarn according to claim 1, characterized in that: In the aforementioned outer short fiber yarn sliver blending process, the feed sliver cans with the adhesive strip wound on them and the feed sliver cans with the cotton strip wound on them, obtained in step three, are first placed sequentially on the pre-drawing devices of the left and right drawing systems, respectively. During this process, the feed sliver cans are pushed onto a lifting plate of the lifting frame, and then the lifting plate is raised to the corresponding height, achieving the vertical stacking arrangement of the feed sliver cans on the lifting frame. Then, the end of the adhesive strip wound inside the feed sliver can is extended and guided by the guide. The corresponding guide rollers on the rods enter the pre-drawing drafting roller group of the left drawing system. The sliver end, after extending from the feed can, passes through the corresponding guide roller group on its guide rod and enters the pre-drawing drafting roller group of the right drawing system. After being drawn by the pre-drawing drafting roller group of the left drawing system, the viscose sliver produces a viscose pre-drawn sliver with improved fiber straightness and a certain width. Similarly, after being drawn by the pre-drawing drafting roller group of the right drawing system, the sliver also produces a sliver with improved fiber straightness and a certain width. The cotton pre-drawing slivers are produced by pressing and outputting each pre-drawing sliver through the lower and upper guide rollers of the left drawing system's guide roller assembly. After output, they enter the corresponding left gathering bell mouth, where they are first gathered in width and then spatially gathered to form a columnar structure of the pre-drawing sliver. The resulting cotton pre-drawing slivers are then pressed and output through the lower and upper guide rollers of the right drawing system's guide roller assembly. After output, they collectively enter the right gathering bell mouth of the right drawing system. Within the right-hand gathering bell mouth, the cotton pre-drawing sliver is first gathered in width and then in space to obtain a columnar structure. During this process, the controlled rotation of the lower guide roller allows for selective feeding of the viscose and cotton pre-drawing slivers. Specifically, based on the blending ratio r, the quantitative amounts T1 of the viscose pre-drawing sliver and T2 of the cotton pre-drawing sliver are calculated, where the sum of the integer number of slivers is M. Here, M is a natural number greater than 1 and less than or equal to N. This means calculating the existence of natural numbers n1 and n2 such that... And n1 + n2 = M. According to the calculated quantitative values and the quantitative values of the fed viscose sliver and cotton sliver, calculate the draft multiples of the pre-drawing roller groups of the left drawframe system and the right drawframe system. At the same time, according to the calculated required number of fed viscose pre-drawn slivers n1 and the number of cotton pre-drawn slivers n2, the programmable logic controller selects the corresponding number of motors to drive the guiding lower rollers to rotate, so as to achieve the selective feeding of the viscose pre-drawn slivers and cotton pre-drawn slivers. During the selection process, if n1 = n2, make the code Li of the pre-drawn sliver device of the selected left drawframe system discontinuous, and make the code Rj of the pre-drawn sliver device of the selected right drawframe system discontinuous. If n1 > n2, make the code Li of the pre-drawn sliver device of the selected left drawframe system remain the most discontinuous, and make the code Rj of the pre-drawn sliver device of the selected right drawframe system discontinuous. If n1 < n2, make the code Li of the pre-drawn sliver device of the selected left drawframe system discontinuous, and make the code Rj of the pre-drawn sliver device of the selected right drawframe system remain the most discontinuous. And at the same time, make the code i of the pre-drawn sliver device of the selected left drawframe system and the code j of the pre-drawn sliver device of the selected right drawframe system increase continuously from 1 to M after merging. The cotton pre-drawn sliver converged and output through the right collecting trumpet and the viscose pre-drawn sliver converged and output through the left collecting trumpet then enter the mixing trumpet. In the mixing trumpet, the selected viscose pre-drawn sliver and cotton pre-drawn sliver are first closely adjacent along the width direction, so that the viscose pre-drawn sliver and cotton pre-drawn sliver gather while maintaining an interlaced arrangement state, and then the horizontal mixing of viscose and cotton fibers is realized. Then, they gather along the width direction and the thickness direction at the same time, so that the cotton / viscose mixed pre-drawn sliver is transformed from a transverse planar structure arrangement to a columnar spatial structure arrangement, and then the spatial mixing of viscose and cotton fibers is realized. The gathered columnar cotton / viscose mixed pre-drawn sliver jointly enters the mixing pressing roller group. Under the close pressing between the left mixing pressing roller and the right mixing pressing roller that rotate actively at the same time in the mixing pressing roller group, the columnar cotton / viscose mixed pre-drawn sliver is transformed into a planar structure. During the transformation process, the polyester fibers and cotton fibers randomly transfer to each other, so as to realize the pressing and mixing effect of polyester fibers and cotton fibers. The planar cotton / viscose mixed pre-drawn sliver continuously enters the mixing drawframe drawing roller group under the drive of the mixing pressing roller group. Under the drawing effect of the mixing drawframe drawing roller group that is 3% - 8% higher or 1% - 4% lower than the total number of fed cotton pre-drawn slivers and viscose pre-drawn slivers, the planar cotton / viscose mixed pre-drawn sliver is drawn thinner and then converged through the output trumpet to obtain a cotton-viscose mixed sliver with improved evenness and fiber straightness. The cotton-viscose mixed sliver is continuously output after being pressed and driven by the left winding roller and the right winding roller of the winding roller pair. The output cotton-viscose mixed sliver passes through the mixing input port and the mixing output port of the winding disk in a tensioned state and then continuously winds around the bobbin.

10. The method for producing washi paper composite yarn according to claim 1, characterized in that: The twist direction of the washi paper yarn wrapped around the polyester filament in the composite core yarn is consistent with the twist direction of the outer cotton-viscose blend yarn.

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