Domestic lyocell fiber pure-spinning high-quality yarn based on common carding process and production method and application of domestic lyocell fiber pure-spinning high-quality yarn

Abstract

The invention discloses a domestic Lyocell fiber pure spinning high-quality yarn based on a common carding process and a production method and application thereof.The domestic Lyocell fiber is used as a raw material, the domestic Lyocell fiber is sequentially subjected to the blowing process, the cotton carding process, the first drawing and drawing process, the second drawing and drawing process, the roving process, the spinning process and the spooling process, and then the domestic common carding Lyocell yarn is obtained; the performance indexes are as follows: the breaking strength is 260.4-410cN; the single yarn breaking strength variable coefficient CV% value is 6.3-8.7%; the percent value of the variation coefficient CV of the Uster evenness is 9.74 to 11.87 percent; the detail of the index of the Uster evenness is-40% / to 50% 1.67 / 0 to 65.7 / 1.4; the Uster yarn evenness index nub is + 35% / + 50%: 14.6 / 0.4-59 / 4; the Uster yarn evenness index of neps is + 140% / + 200%: 27.9 / 9.6-64 / 21.3. The problems that in the combing process of existing domestic lyocell fibers, the technological process is long, raw material loss is large, the production cost is high, in the common carding process, the blowing-carding process is long, neps and noil are many, and high-quality yarn cannot be spun at a high speed are solved.

Description

Technical Field

[0001] This invention relates to a method for producing high-quality yarn from domestically produced lyocell fiber using a carding process, and its application. Specifically, it relates to a method for producing high-quality yarn from domestically produced lyocell fiber using a carding process, and the high-quality yarn products obtained by this method and their related applications, which belong to the field of spinning technology. Background Technology

[0002] Lyocell fiber is a regenerated cellulose fiber prepared from bamboo and wood pulp as raw materials and N-methylmorpholine-N-oxide (NMMO) as a solvent. Lyocell fiber waste is recyclable and biodegradable, with a solvent recovery rate of up to 99.7% during the production process. It is not only energy-saving and environmentally friendly but also sustainable, earning it the title of "21st-century green fiber." Lyocell fiber combines many excellent properties of natural and synthetic fibers, exhibiting high dry and wet breaking strength with a small difference between dry and wet strength. It also possesses the strength of polyester, the comfort of cotton, the drape of viscose fiber, and the luster of silk. More and more companies are switching to the production of lyocell fiber products to meet market demands and increase product added value.

[0003] The preparation of pure domestic lyocell yarn mostly adopts the combing process, which requires combing preparation and combing process, namely opening process → carding process → pre-winding process → combing process → drawing process → roving process → spinning process → winding process. Although the combing process removes short fibers and impurities, the raw material loss is high, the process is long, the complexity is high, the investment is large and the cost is high.

[0004] Carded spinning has a short production process, high production efficiency, low raw material loss, and cost savings. In 2022, Xue Liwei et al. reported in the *Journal of Textile Science Research* a method for spinning 40s and 60s lyocell yarns using domestically produced lyocell fiber as raw material, employing a carded process: A002D disc cotton picker → FA025 blender → FA106 opener → FA046 vibrating feeder → FA076 lap machine → FA227A carding machine → FA387 drawing frame → FA387 drawing frame → BHFA497 roving frame → TH518 spinning frame → NO21C winding machine. However, in the combined carding and cleaning process, the increased number of steps leads to increased neps, and the carding process uses a small spacing, resulting in more waste cotton, higher raw material loss, slower spinning machine speed, and lower output. In the same year, Mu Guantao et al. published an article in the *Journal of Textile Science Research* on the pure spinning of 9.7 tex lyocell yarn using domestically produced lyocell fiber as raw material and employing a carding process: FA380 disc cotton picker → Rieter B34 blending machine → Rieter A79 cotton storage machine → Rieter C72 carding machine → Rieter SB-D50 drawing frame → Rieter RSB-D50 drawing frame → Universal CMT-1801 roving frame → Rieter G32 spinning frame → Celford AUTOCONER 6 winding machine. Although the carding and cleaning process was short, the yarn quality needed improvement.

[0005] Therefore, using domestically produced lyocell fiber as raw material, a spinning process was designed to overcome the problems of a long combing process, high raw material loss, high complexity, large investment, high cost, and the long combing-cleaning process in the currently used carding process. Simultaneously, process parameters were optimized to reduce fiber loss, reduce raw material loss and neps, and further improve yarn performance while ensuring high quality and high speed.

[0006] In the prior art, Chinese patent CN107858776A discloses a lyocell pure spun compact Siro yarn, its production method, and its uses. This production method uses lyocell fiber as raw material. Its opening process employs a short flow, more combing and less beating, thinner feeding and less waste, increasing the opening density and humidifying to minimize the generation of short lyocell fibers. The carding process maximizes fiber integrity and reduces neps. The drawing process uses low speed to improve the unevenness of sliver weight, with three drawing stages. The roving process uses a light weight and low speed to ensure normal yarn drafting. The spinning process uses a small back zone draft ratio and feeds through two trumpet-shaped openings, thus successfully spinning a 60-count compact Siro yarn. The resulting fabric is comfortable, breathable, smooth, soft, anti-pilling, and has excellent colorfastness, making it suitable for high-end bedding. However, the combined cleaning and carding process used in this patent (A002C automatic cotton picker, A036B porcupine cotton opener → A092A double cotton box cotton feeding machine → A076C lap forming machine → A186 carding machine) is relatively long, and the small spacing between processes results in more cotton waste and higher raw material loss. Furthermore, while the three-stage drawing process before spinning enhances the evenness, it also further increases raw material loss. Overall, this process needs improvement in terms of output, product quality indicators, and yarn strength. Summary of the Invention

[0007] The purpose of this invention is to provide a carding process for high-quality domestic lyocell yarn, in order to solve the technical problems of long process flow, large raw material loss and high production cost in the combing process of existing domestic lyocell fibers, long process flow of cleaning and carding combined process, many neps and cotton waste in the carding process, and how to spin high-quality yarn at high speed. In this way, it can improve the development of domestic lyocell in the carding process, save raw materials and increase the economic benefits of the industry and enterprises.

[0008] This invention is achieved through the following technical solution: a method for spinning high-quality yarn from domestically produced lyocell fiber based on a carding process, using domestically produced lyocell fiber as raw material, and sequentially passing through a cleaning process, a carding process, a first drawing and sliver drawing process, a second drawing and sliver drawing process, a roving process, a spinning process, and a winding process to obtain domestically produced carded lyocell yarn. The performance indicators of the domestically produced carded Lyocell yarn are as follows: Fracture strength: 260.4~410cN; Coefficient of variation (CV%) of single yarn breaking strength: 6.3–8.7%; Uster strip uniformity coefficient of variation (CV%): 9.74–11.87%; Uster uniformity index details -40% / ~50%: 1.67 / 0~65.7 / 1.4; Uster uniformity index for coarse nodules (+35% / +50%): 14.6 / 0.4~59 / 4; Uster evenness index for cotton neps +140% / +200%: 27.9 / 9.6~64 / 21.3.

[0009] The raw material is domestically produced 1.33dtex×38mm lyocell fiber with a count of 30-60 English count.

[0010] The cotton cleaning process includes a cotton grabber, a heavy object separator, a multi-compartment cotton blender, and a fine cotton opener arranged in sequence.

[0011] In the carding process, the following parameters are controlled: the distance between the upper air intake of the licker-in roller is 2-8 mm; the distance between the licker-in roller and the first dust removal knife is 20-26 filaments; the angle between the licker-in roller and the second dust removal knife is 2-18°; the distance between the cylinder and the licker-in roller is 8 filaments; the distance between the rear fixed cover plate and the cylinder is 16-24 filaments; the distance between the movable cover plate and the cylinder is 10-12 filaments; the distance between the front fixed cover plate and the cylinder is 12 filaments; the distance between the cylinder and the doffer is 5-7 filaments; the distance between the front lower cover plate and the cylinder is 26-40 filaments; the distance between the large bottom inlet is 4-5 mm; the distance between the large bottom outlet is 31-40 filaments; the distance between the dust removal knife of the front web cleaner and the cylinder is 12-14 filaments; and the distance between the guide plate and the cylinder is 40-50 filaments.

[0012] In the carding process, the speed of the moving flat plate is controlled at 120-180 r / min; the cylinder speed is 390-400 r / min; the licker-in speed is 775-1070 r / min; the licker-in ratio is 1.93:1-2.2:1; the machine speed is 105-167 m / min; and the carding weight is 28.5-30 g / 5m.

[0013] In the head-and-strip-combining process, the number of strips combined is 5, the draft ratio in the post-combining zone is controlled at 1.75 times, the drafting interval is 11.5mm×24mm, the rolling speed is 200~278m / min, the semi-cooked strip weight is 23~24g / 5m, and the diameter of the flared end of the strip is 3.2~4.0mm.

[0014] In the second-stage sliver drawing process, the number of slivers drawn together is 6, the draft ratio in the post-drawing zone is controlled at 1.14 to 1.75 times, the drafting interval is 14mm × 25mm, the sliver drawing speed is 230 to 328m / min, the sliver weight is 19 to 20g / 5m, and the sliver flare diameter is 3.5mm.

[0015] In the roving process, the roving roller spacing is controlled to be 8mm×25mm×40mm; the back zone draft is 1.14 to 1.19 times; the roving frame has four rollers, and their cradle pressures are as follows: back roller: 150N, third roller: 150N, second roller: 250N, and front roller: 120N.

[0016] In the spinning process, the yarn drafting gap is controlled to be 19mm×45mm, the yarn drafting ratio is 40 to 100 times, the gap block is 2 to 2.75mm, the cradle pressure is 180 to 210CN, and the compact spinning negative pressure is 2000 to 2800Pa.

[0017] In the winding process, the splicing air pressure is controlled at 6.2 to 6.6 bar, and the winding tension is 46 to 56 CN.

[0018] In the first drawing and sliver drawing process, the second drawing and sliver drawing process, the roving process, the spinning process, and the winding process, the production conditions are controlled to meet the following: summer temperature 28-37℃ and humidity 55-75%; winter temperature 22-34℃ and humidity 55-70%.

[0019] The present invention also provides a domestically produced carded lyocell yarn, which is produced by the above-mentioned method of spinning high-quality yarn from domestically produced lyocell fibers based on the carding process.

[0020] Furthermore, this invention also provides applications for the aforementioned domestically produced carded Lyocell yarn, using it in the manufacture of clothing or home textile products. Specifically, clothing products include, but are not limited to, high-end shirts, suits, and underwear, while home textile products include, but are not limited to, bed sheets, duvet covers, and sofa covers.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) The present invention adopts a simple carding process: reciprocating cotton grabber → heavy object separator → multi-bin cotton blender → fine cotton opener → carding machine → first drawing and drawing machine → second drawing and drawing machine → roving → compact spinning and spinning machine → winding. By optimizing the configuration of the cleaning and carding line, the loss of Lyocell fiber raw materials and production costs are significantly reduced, and production efficiency is improved.

[0022] (2) By systematically optimizing the process parameters of each process, this invention effectively solves the problems of large fiber damage, many knots and quality fluctuations in traditional carded Lyocell yarn, and significantly improves the quality and stability of yarn.

[0023] (3) This invention achieves specific optimization of yarn evenness and nipple index. Combined with nip control in carding process, spacing improvement in drawing and roving process, yarn formation optimization in spinning process and appearance finishing in winding process, it realizes stable production of high-quality yarn under high speed conditions and provides reliable process support for the industrial upgrading of domestic lyocell yarn. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the production process of the present invention. Detailed Implementation

[0025] The invention's objective, technical solution, and beneficial effects will be further explained in detail below.

[0026] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the claimed invention. Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] This invention aims to provide an optimized domestic lyocell carding spinning process and the high-quality yarn produced by this method. This process, through systematic optimization of parameters in each process, not only solves the problems of long equipment flow, many cotton knots, and large amount of cotton waste in the traditional carding process, but also achieves the goal of stably spinning high-quality yarn under high-speed production conditions, significantly improving the comprehensive performance indicators of lyocell yarn.

[0028] The optimized carded spinning process of this invention is as follows: opening process, carding process, drawing process (first drawing and second drawing), roving process, spinning process, and winding process. See below. Figure 1 As shown. In the opening process, a cotton grabber, a heavy object separator, a multi-bin blender, and a fine opening machine are arranged sequentially. The cotton grabber separates heavy objects and impurities from the fibers in the raw material; a reciprocating cotton grabber can be used. The heavy object separator uses aerodynamic principles to remove impurities, which helps reduce fiber damage. The multi-bin blender uses multiple cotton storage bins for fine mixing, while using beaters, corner nail curtains, leveling rollers, and stripping rollers to achieve a certain degree of opening. The fine opening machine is used for "fine opening, efficient impurity removal, and uniform mixing." In the carding process, a flat carding machine combs the fibers, breaking down the initially opened fiber clumps into individual fibers, removing impurities, uniformly mixing, and forming slivers. In the drawing process, the following are sequentially arranged... The process employs a first-drawing frame and a second-drawing frame. The first-drawing frame is used to initially combine and draft the raw sliver, rapidly and significantly improving the sliver's evenness and fiber condition, and initially straightening the fibers. The second-drawing frame, based on the first-drawing frame, further combines, drafts, and self-regulates the fibers to produce a finished sliver that meets the quality indicators (sliver evenness CV value, fiber straightness, weight unevenness, etc.) for entry into the roving process. The finished sliver is then drafted, twisted, wound, and shaped on a four-up, four-down double short apron roving frame. In the spinning process, a compact Siro spinning frame is used. The Siro compact spinning process combines the advantages of Siro spinning and compact spinning, feeding two rovings parallel into the spinning drafting zone to enhance sliver strength, reduce hairiness, and improve sliver evenness. In the winding process, a winding machine with functions such as automatic bobbin feeding, automatic yarn generation, and automatic winding is used to process the bobbins wound off the spinning machine into bobbin packages with a certain capacity suitable for the unwinding needs of the next process, and to remove yarn defects.

[0029] Based on the above-mentioned carded spinning process, this invention further optimizes the process parameters of each step systematically, as follows: For the cotton cleaning process, the distance between the ribs extending from the cotton grabber is set to -2mm, and the cotton grabber speed is set to 1000–1200 r / min. Adjusting the dust bar angle of the heavy-duty separator to 0° reduces cotton waste during the cleaning process. The distance between the cotton leveling roller and the corner nail curtain on the multi-bin blending machine is set to 15–35mm, and the distance between the cotton stripping roller and the corner nail curtain is set to 5–35mm, with the air intake fan frequency set to 20–50Hz. The distance between the cotton opener's beater and the feed roller is set to 3mm, and the cotton opener's beater speed is set to 350–410 r / min. These equipment and parameter adjustments shorten the cleaning process, reduce raw material consumption, minimize fiber damage, and reduce the possibility of neps.

[0030] For the carding process, by rationally configuring the carding gaps at various points on the equipment, neps can be reduced and spinnability improved. In actual production, the following parameters are adjusted sequentially: upper suction inlet gap of the licker-in roller: 2–8 mm; gap between the licker-in roller and the first dust removal knife: 20–26 filaments (1 filament = 1 / 1000 inch); angle between the licker-in roller and the second dust removal knife: 2–28°; gap between the cylinder and the licker-in roller: 8 filaments; gaps between the rear fixed cover and the cylinder from bottom to top: 24, 22, 20, 18, 16, 16 filaments; gaps between the movable cover and the cylinder from back to front: 12, 10, 10, 10, 10, 10, 10, 10, 10. 10 filaments, where front and back are relative positions, the output direction is front, the direction of the rear upper fixed cover plate (16 filaments away from the cylinder) is back, and the direction of the front upper fixed cover plate is front; the distance between the front fixed cover plate and the cylinder is 12 filaments; the distance between the cylinder and the doffer is 5-7 filaments; the distance between the front lower cover plate and the cylinder is 26-40 filaments; the distance between the large bottom inlet is 4-5mm; the distance between the large bottom outlet is 31-40 filaments; the distance between the front cotton web cleaner dust removal knife and the cylinder is 12-14 filaments; and the distance between the guide plate and the cylinder is 40-50 filaments.

[0031] By continuously controlling and coordinating the above parameters, such as increasing the inlet gap between the cylinder and the movable cover plate, decreasing the gap between the front lower cover plate and the cylinder, increasing the cylinder-doffer gap, increasing the inlet gap of the large bottom vent, and decreasing the gap between the rear fixed cover plate and the cylinder, the combing effect can be enhanced, the neps in the sliver can be reduced, and the short fiber rate can be lowered, thereby laying the foundation for the spinnability of the subsequent spinning.

[0032] Meanwhile, in order to reduce raw material loss in the carding process, the moving flat plate speed adopts the principle of "slow speed", setting the moving flat plate speed to 120-180 r / min; cylinder speed to 390-400 r / min; licker-in speed to 775-1070 r / min; licker-in ratio to 1.93:1-2.2:1; machine speed to 105-167 m / min; carding weight to 28.5-30 g / 5 m, with 30 g / 5 m being the preferred carding weight.

[0033] For the first drawing and sliver forming process, taking advantage of the smooth surface of lyocell fibers, this process adopts the principle of "fewer slivers, smaller spacing, and stronger control" to adjust multiple parameters. The number of slivers drawn is 5, and the draft ratio in the post-drawing zone is adjusted to 1.75, with a draft spacing of 11.5mm × 24mm; the drawing speed is 200–278 m / min; the semi-cured sliver weight is 23–24 g / 5m; and the drawing sliver bell diameter is 3.2–4.0 mm. The production conditions for this process are: summer temperature 28–34℃, humidity 55–70%; winter temperature 26–30℃, humidity 55–70%.

[0034] For the second drawing and sliver forming process, the "tight spacing" principle is adopted to adjust various parameters of this process, which can effectively improve yarn evenness and strengthen fiber control. This is achieved by adjusting the drafting spacing to 14mm × 25mm, the draft ratio in the post-drawing zone to 1.14–1.75, the number of drawn ends to 6, the drawing speed to 230–328 m / min, the sliver weight to 19–20 g / 5m, and the drawing sliver bell diameter to 3.5mm. The production conditions are: summer temperature 28–34℃, humidity 55–70%; winter temperature 26–30℃, humidity 55–70%.

[0035] For the roving process, the principle of "tight spacing, strong control, and small back zone drafting" is adopted to further improve the evenness of the roving. The roving roller spacing is set to 8mm × 25mm × 40mm; the back zone drafting is 1.14–1.19 times; the roving frame has four rollers, and the cradle pressure distribution is adjusted as follows: back roller middle setting (150N), third roller middle setting (150N), second roller front setting (250N), and front roller middle setting (120N); the false twister uses an XDY-188D type to solve the problem of untwisting at the false twister, avoiding affecting the roving quality; the roving twist coefficient is 86.54, and the roving basis weight is 4.6–4.8 g / 10m. The production conditions are: summer temperature 28–34℃, humidity 55–70%; winter temperature 26–30℃, humidity 55–70%.

[0036] For the spinning process, a "small back zone drafting" principle is adopted to ensure yarn quality and reduce the generation of short, thick places. To avoid excessive back zone drafting and resulting torsional vibration in the rollers, the back zone drafting is set at 1.098 times. Furthermore, to improve yarn spinnability and reduce yarn breakage, Jinmao brand ZB travelers (22.4–23.6 mm) are used. In addition, the yarn drafting spacing is set at 19 mm × 45 mm; the yarn drafting ratio is 40–100 times; the average spindle speed is 18500 r / min; the spacing block is 2–2.75 mm; the cradle pressure is 180–210 CN; the ring is ZM-4054AG; and the compact spinning negative pressure is 2000–2800 Pa. The production conditions for this process are: summer temperature 28–37℃, humidity 55–65%; winter temperature 26–34℃, humidity 55–70%.

[0037] For the winding process, a VCRO Plus automatic winding machine is used, while the Uster electronic yarn clearer is used for post-spinning winding production. To reduce yarn breakage during the winding process, the process principle of "reducing twisting air pressure and winding tension" is adopted. Specifically, the support arm air pressure is set to 1.2 bar, the winding tension for Ly40s is 56 bar, for Ly50s it is 52 bar, and for Ly60s it is 46 bar. To improve the strength ratio of the yarn splice to the original yarn during the winding process, ensuring a strength ratio above 80%, and simultaneously improving the appearance of the yarn splice and reducing neps and hairiness, the twisting air pressure is adjusted to 6.2–6.6 bar, the untwisting time is set to 3 seconds, the overlap length is 15 mm, the twisting time is controlled to 1 second, and the machine speed is 900–1100 m / min. The winding electronic clearer parameters are as follows: 40.2 pieces: NSL: 265% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±15% / 2m~±9%12m; 50.2 pieces: NSL: 320% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±16% / 2m~±10%12m; 60 pieces: NSL: 330% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±15% / 2m~±9%12m; Among them, N (neps), S (short thick section), L (long thick section), T (detail), C (yarn count after splicing), and CC (yarn count bias).

[0038] The production conditions for this process are as follows: summer temperature 28–32℃, humidity 65–75%; winter temperature 22–26℃, humidity 60–70%.

[0039] The specific implementation of the present invention will be described below with reference to the embodiments. Of course, the scope of protection of the present invention is not limited to the following embodiments.

[0040] Example 1: Pure domestic Lyocell carded 60-count compact Siro-spun yarn The domestic Lyocell 60-count compact Siro-spun yarn has the following process flow: opening, carding, drawing, roving, spinning, and winding. The lyocell fiber is: domestically produced 1.33dtex×38mm lyocell fiber, purchased from Sichuan Siliya Fiber Technology Co., Ltd.

[0041] (1) Cleaning process: The distance between the ribs of the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton equalization roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine beater and the cotton feeding roller is 3mm, and the speed of the cotton opening beater is 400r / min.

[0042] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 2-3 mm, the distance between the licker-in roller and the first dust removal knife is 26 filaments, the angle between the licker-in roller and the second dust removal knife is 2°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 24, 22, 20, 18, 16, 16 filaments, the distance between the movable cover plate and the cylinder is 12, 10, 10, 10, 10, 10, 10, 10, 10 filaments, the distance between the front fixed cover plate and the cylinder is 12 filaments, the distance between the cylinder and the doffer is 7 filaments, the distance between the front lower cover plate and the cylinder is 26 filaments, the distance between the large bottom inlet is 4 mm, the distance between the outlet is 40 filaments, the distance between the dust removal knife of the front web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0043] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, tin-to-licker ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0044] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 5 drawing strands, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell diameter of 3.6mm. The last drawing zone has a draft ratio of 1.75 times, a drafting interval of 14mm×25mm, 6 drawing strands, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell diameter of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0045] (4) Roving process: roving twist coefficient 85.44, roving weight 4.8g / 10m; roller spacing 8mm×25mm×40mm; back zone draft 1.14 times, cradle pressure distribution adjusted to middle (120N) front (250N) middle (150N) middle (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0046] (5) Spinning process: This product is a domestic Lyocell combed 60-count compact Siro yarn. The spinning machine is equipped with Siro compact spinning equipment for production. Two rovings are fed into the spinning drafting zone at a certain distance and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting, thus producing domestic Lyocell combed 60-count compact Siro yarn. Yarn; yarn draft ratio 97.54, twist 1130T / m, back zone draft 1.098, yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.25, cradle pressure 180~210CN, ring ZM-4054AG, JINMAO brand ZB steel traveler 22.4, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0047] (6) Winding process: Domestic Lyocell fiber has high dry and wet strength and high initial modulus. In order to ensure the appearance and twisting strength of Lyocell yarn splicing, the support arm air pressure is 1.2 bar, the winding tension is 46, the splicing air pressure is 6.4 bar, the untwisting time is 3 seconds, the overlap length is 15 mm, the twisting time is 1 second, and the machine speed is 1000 m / min. The Uster electronic yarn clearer is used in the post-spinning winding production. The winding machine electronic clearing parameters are: NSL: 330% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±15% / 2m~±9%12m. The production conditions are: temperature 28~31℃, humidity 65~75%.

[0048] Example 2: Pure domestic Lyocell combed 50.2 English count compact Siro-spun yarn The manufacturing process of domestically produced Lyocell 50.2-count compact Siro-spun yarn includes: opening, carding, drawing, roving, spinning, and winding. The lyocell fiber is: domestically produced 1.33dtex×38mm lyocell fiber, purchased from Sichuan Siliya Fiber Technology Co., Ltd.

[0049] (1) Cleaning process: The distance between the ribs of the cotton grabber and the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton leveling roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine and the cotton feeding roller is 3mm, and the speed of the cotton opening machine is 400r / min.

[0050] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 2-3 mm, the distance between the licker-in roller and the first dust removal knife is 26 filaments, the angle between the licker-in roller and the second dust removal knife is 2°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 24, 22, 20, 18, 16 filaments, the distance between the movable cover plate and the cylinder is 12, 10, 10, 10, 10, 10, 10, 10, 10 filaments, the distance between the front fixed cover plate and the cylinder is 12 filaments, the distance between the cylinder and the doffer is 7 filaments, the distance between the front lower cover plate and the cylinder is 26 filaments, the distance between the large bottom inlet is 4 mm, the distance between the outlet is 40 filaments, the distance between the dust removal knife of the front web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0051] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, licker-in ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding dry basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0052] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 5 slivers drawn, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell mouth of 3.6mm. The last drawing zone has a draft ratio of 1.75 times, a drafting interval of 14mm×25mm, 6 slivers drawn, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell mouth of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0053] (4) Roving process: roving twist coefficient 86.54, roving weight 4.8g / 10m; roller spacing 8mm×25mm×40mm; back zone draft 1.14 times, cradle pressure distribution adjusted to middle (120N) front (250N) middle (150N) middle (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0054] (5) Spinning process: This product is a domestic Lyocell combed 60-count compact Siro yarn. The spinning machine is equipped with Siro compact spinning equipment for production. Two rovings are fed into the spinning drafting zone at a certain distance and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting process, thus producing domestic Lyocell combed 50.2-count compact Siro yarn. Spinning yarn; fine yarn draft ratio 81.61 times, twist 1080T / m, back zone draft 1.098 times, fine yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.5, cradle pressure 180~210CN, ring ZM-4054AG, JINMAO brand ZB steel traveler 23.6, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0055] (6) Winding process: Domestic Lyocell fiber has high dry and wet strength and high initial modulus. In order to ensure the appearance and twisting strength of Lyocell yarn splicing, the support arm air pressure is 1.2 bar, the winding tension is 52, the splicing air pressure is 6.4 bar, the untwisting time is 3 seconds, the overlap length is 15 mm, the twisting time is 1 second, and the machine speed is 1200 m / min. The Uster electronic yarn clearer is used in the post-spinning winding production. The winding machine electronic clearing parameters are: NSL: 320% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±16% / 2m~±10%12m. The production conditions are: temperature 28~31℃, humidity 65~75%.

[0056] Example 3: Pure domestic Lyocell combed 40.2 English count compact Siro-spun yarn The domestic Lyocell 40.2-count compact Siro-spun yarn has the following process flow: opening, carding, drawing, roving, spinning, and winding. The lyocell fiber is: domestically produced 1.33dtex×38mm lyocell fiber, purchased from Sichuan Siliya Fiber Technology Co., Ltd.

[0057] (1) Cleaning process: The distance between the ribs of the cotton grabber and the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton leveling roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine and the cotton feeding roller is 3mm, and the speed of the cotton opening machine is 400r / min.

[0058] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 2-3 mm, the distance between the licker-in roller and the first dust removal knife is 26 filaments, the angle between the licker-in roller and the second dust removal knife is 2°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 24, 22, 20, 18, 16, 16 filaments, the distance between the movable cover plate and the cylinder is 12, 10, 10, 10, 10, 10, 10, 10, 10 filaments, the distance between the front fixed cover plate and the cylinder is 12 filaments, the distance between the cylinder and the doffer is 7 filaments, the distance between the front lower cover plate and the cylinder is 26 filaments, the distance between the large bottom inlet is 4 mm, the distance between the outlet is 40 filaments, the distance between the dust removal knife of the front web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0059] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, licker-in ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding dry basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0060] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 5 slivers drawn, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell mouth of 3.6mm. The last drawing zone has a draft ratio of 1.75 times, a drafting interval of 14mm×25mm, 6 slivers drawn, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell mouth of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0061] (4) Roving process: roving twist coefficient 85.44, roving weight 4.8g / 10m; roller spacing 8mm×25mm×40mm; back zone draft 1.14 times, cradle pressure distribution adjusted to middle (120N) front (250N) middle (150N) middle (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0062] (5) Spinning process: This product is a domestic Lyocell combed 60-count compact Siro yarn. The spinning machine is equipped with Siro compact spinning equipment for production. Two rovings are fed into the spinning drafting zone at a certain distance and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting process, thus producing domestic Lyocell combed 40.2-count compact Siro yarn. Spinning yarn; fine yarn draft ratio 68.8 times, twist 900T / m, back zone draft 1.098 times, fine yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.75, cradle pressure 180~210CN, ring ZM-4054AG, JINMAO brand ZB steel traveler 23.6, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0063] (6) Winding process: Domestic Lyocell fiber has high dry and wet strength and high initial modulus. In order to ensure the appearance and twisting strength of Lyocell yarn splicing, the support arm air pressure is 1.2 bar, the winding tension is 56, the splicing air pressure is 6.4 bar, the untwisting time is 3 seconds, the overlap length is 15 mm, the twisting time is 1 second, and the machine speed is 1300 m / min. The Uster electronic yarn clearer is used in the post-spinning winding production. The winding machine electronic clearing parameters are: NSL: 265% / 0.5cm~0% / 0cm, C: ±12% / 8m, CC: ±15% / 2m~±9%12m. The production conditions are: temperature 28~31℃, humidity 65~75%.

[0064] Comparative Example 1: The traditional process for producing 60-count compact Siro-spun yarn from domestically produced 1.33dtex×38mm lyocell fiber is as follows: (1) Cleaning process: The distance between the ribs of the cotton grabber and the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton leveling roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine and the cotton feeding roller is 3mm, and the speed of the cotton opening machine is 400r / min.

[0065] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 8mm, the distance between the licker-in roller and the first dust removal knife is 20 filaments, the angle between the licker-in roller and the second dust removal knife is 18°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 28, 24, 22, 20, 18, 16 filaments, the distance between the movable cover plate and the cylinder is 13 filaments, the distance between the front fixed cover plate and the cylinder is 13, 13, 12, 12, 12, 12 filaments, the distance between the cylinder and the doffer is 8 filaments, the distance between the front lower cover plate and the cylinder is 22 filaments, the distance between the large bottom inlet is 4mm, the distance between the outlet is 31 filaments, the distance between the dust removal knife of the front cotton web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0066] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, licker-in ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding dry basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0067] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 6 drawing strands, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell mouth of 3.6mm. The last drawing zone has a draft ratio of 1.25 times, a drafting interval of 14mm×29mm, 6 drawing strands, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell mouth of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0068] (4) Roving process: roving twist coefficient 85.44, roving weight 4.8g / 10m; roller spacing 10mm×26mm×38mm; back zone draft 1.19 times, cradle pressure distribution adjusted to medium (120N) medium (200N) medium (150N) medium (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0069] (5) Spinning process: This product is a domestically produced Lyocell combed 60-count compact Siro yarn. The spinning machine is equipped with Siro compact spinning equipment for production. Two rovings are fed into the spinning drafting zone at a certain distance and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting process, thus producing domestically produced Lyocell combed 60-count compact yarn. Siro-spun yarn; fine yarn draft ratio 97.54, twist 1130T / m, back zone draft 1.098, fine yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.25, cradle pressure 180~210CN, ring ZM-4054AG, traveler 22.4, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0070] (6) Winding process: support arm air pressure 0.6 bar, winding tension 74, splicing air pressure 6.8 bar, untwisting time: 3 seconds, overlap length 15 mm: twisting time 6 seconds, machine speed 1000 m / min; winding machine electrical parameters: NSL: 330% / 0.5 cm~0% / 0 cm, C: ±12% / 8 m, CC: ±15% / 2 m~±9%12 m; production conditions: temperature 28~31℃, humidity 65~75%.

[0071] Comparative Example 2: The traditional process for producing 50.2-count compact Siro-spun yarn from domestically produced 1.33dtex×38mm lyocell fiber is as follows: (1) Cleaning process: The distance between the ribs of the cotton grabber and the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton leveling roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine and the cotton feeding roller is 3mm, and the speed of the cotton opening machine is 400r / min.

[0072] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 8mm, the distance between the licker-in roller and the first dust removal knife is 20 filaments, the angle between the licker-in roller and the second dust removal knife is 18°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 28, 24, 22, 20, 18, 16 filaments, the distance between the movable cover plate and the cylinder is 13 filaments, the distance between the front fixed cover plate and the cylinder is 13, 13, 12, 12, 12, 12 filaments, the distance between the cylinder and the doffer is 8 filaments, the distance between the front lower cover plate and the cylinder is 22 filaments, the distance between the large bottom inlet is 4mm, the distance between the outlet is 31 filaments, the distance between the dust removal knife of the front cotton web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0073] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, licker-in ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding dry basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0074] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 6 drawing strands, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell mouth of 3.6mm. The last drawing zone has a draft ratio of 1.25 times, a drafting interval of 14mm×29mm, 6 drawing strands, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell mouth of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0075] (4) Roving process: roving twist coefficient 85.44, roving weight 4.8g / 10m; roller spacing 10mm×26mm×38mm; back zone draft 1.19 times, cradle pressure distribution adjusted to medium (120N) medium (200N) medium (150N) medium (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0076] (5) Spinning process: This product is a domestically produced Lyocell combed 50.2 English count compact spun yarn. The spinning machine is equipped with Siro compact spinning equipment for production. Two rovings are fed into the spinning drafting zone at a certain distance and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting process, thus producing domestically produced Lyocell combed 50.2 English count yarn. Compact Siro-spun yarn; yarn draft ratio 81.61, twist 1080T / m, back zone draft 1.098, yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.5, cradle pressure 180~210CN, ring ZM-4054AG, traveler 22.4, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0077] (6) Winding process: support arm air pressure 0.8 bar, winding tension 76, splicing air pressure 6.8 bar, untwisting time: 3 seconds, overlap length 15 mm: twisting time 6 seconds, machine speed 1200 m / min; winding machine electrical parameters: NSL: 320% / 0.5 cm~0% / 0 cm, C: ±12% / 8 m, CC: ±16% / 2 m~±10%12 m; production conditions: temperature 28~31℃, humidity 65~75%.

[0078] Comparative Example 3: The traditional process for producing 40.2-count compact Siro-spun yarn from domestically produced 1.33dtex×38mm lyocell fiber is as follows: (1) Cleaning process: The distance between the ribs of the cotton grabber and the cotton grabber is -2mm, and the speed of the cotton grabber is 1100r / min; the angle of the dust bar of the heavy object separator is adjusted to 0°; the distance between the cotton leveling roller and the corner nail curtain of the multi-compartment cotton blending machine is 25mm, the distance between the cotton stripping roller and the corner nail curtain is 17mm, the frequency of the air inlet fan is 32Hz, the distance between the cotton opening machine and the cotton feeding roller is 3mm, and the speed of the cotton opening machine is 400r / min.

[0079] (2) Carding process: The distance between the upper air inlet of the licker-in roller is 8mm, the distance between the licker-in roller and the first dust removal knife is 20 filaments, the angle between the licker-in roller and the second dust removal knife is 18°, the distance between the cylinder and the licker-in roller is 8 filaments, the distance between the rear fixed cover plate and the cylinder is 28, 24, 22, 20, 18, 16 filaments, the distance between the movable cover plate and the cylinder is 13 filaments, the distance between the front fixed cover plate and the cylinder is 13, 13, 12, 12, 12, 12 filaments, the distance between the cylinder and the doffer is 8 filaments, the distance between the front lower cover plate and the cylinder is 22 filaments, the distance between the large bottom inlet is 4mm, the distance between the outlet is 31 filaments, the distance between the dust removal knife of the front cotton web cleaner and the cylinder is 14 filaments, and the distance between the guide plate and the cylinder is 50 filaments.

[0080] Process speeds and basis weights at various points: cylinder speed 400 r / min, licker-in speed 1065 r / min, licker-in ratio 1.93:1, moving cover speed 170 r / min, machine speed 105 m / min, carding dry basis weight 30 g / 5 m; processing conditions for sliver: temperature 30-32℃, humidity 63-65%.

[0081] (3) Drawing process: Two-stage drawing is adopted to strengthen weight control and reduce weight unevenness. The second drawing machine is equipped with a self-adjusting leveling device. The first drawing zone has a draft ratio of 1.75 times, a drafting interval of 11.5mm×24mm, 6 drawing strands, a drawing speed of 215m / min, a drawing weight of 24g / 5m, and a drawing bell mouth of 3.6mm. The last drawing zone has a draft ratio of 1.25 times, a drafting interval of 14mm×29mm, 6 drawing strands, a drawing speed of 230m / min, a drawing weight of 20g / 5m, and a drawing bell mouth of 3.5mm. Production conditions: temperature 31~33℃, humidity 63~64%.

[0082] (4) Roving process: roving twist coefficient 85.44, roving weight 4.8g / 10m; roller spacing 10mm×26mm×38mm; back zone draft 1.19 times, cradle pressure distribution adjusted to medium (120N) medium (200N) medium (150N) medium (150N); production conditions: temperature 30~32℃, humidity 63~64%.

[0083] (5) Spinning process: This product is a domestically produced Lyocell combed 40.2-inch compact Siro-spun yarn. The spinning machine is equipped with a Siro compact spinning device for production. Two rovings are fed into the spinning drafting zone at a certain interval and in parallel for drafting. After drafting, the sliver is output through the front roller nip. Under the action of the Siro compact negative pressure gathering device, the two slivers are further bound together and the fibers are straightened. Then, the front roller holds and outputs the yarn to complete the twisting process, thus producing the domestically produced Lyocell combed 40.2-inch yarn. Compact Siro-spun yarn; yarn draft ratio 68.8, twist 900T / m, back zone draft 1.098, yarn draft spacing 19mm×45mm, average spindle speed 18500r / min, spacing block 2.75, cradle pressure 180~210CN, ring ZM-4054AG, traveler 23.6, compact spinning negative pressure 2800Pa; production conditions: temperature 31~34℃, humidity 53~55%.

[0084] (6) Winding process: support arm air pressure 1 bar, winding tension 69, splicing air pressure 6.8 bar, untwisting time: 3 seconds, overlap length 15 mm: twisting time 6 seconds, machine speed 1300 m / min; winding machine electrical parameters: NSL: 265% / 0.5 cm~0% / 0 cm, C: ±12% / 8 m, CC: ±15% / 2 m~±9%12 m; production conditions: temperature 28~31℃, humidity 65~75%.

[0085] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0086] According to the standard FZ / T 12013-2014 for natural lyocell yarn, the yarns prepared in each embodiment and comparative example were tested, as shown in Table 1 below.

[0087] Table 1 Test Results of Specifications for Domestic Lyocell 40.2-60 English Count Yarn

[0088] As can be seen from the data in Table 1, Examples 1, 2 and 3 all adopted the carding process and optimized process parameters described in this invention, which effectively overcame the problems of complex process, large raw material loss and high cost of traditional combing process, as well as the lengthy cleaning and combing process, many cotton knots and large amount of cotton waste in conventional carding process, and realized the high-speed and high-quality production of domestic Lyocell yarn.

[0089] Compared with Examples 1, 2, and 3, Comparative Examples 1, 2, and 3 exhibit systematic differences in the key process parameter settings of the four processes: carding, drawing, roving, and winding. For example, the key spacing in the carding process, the draft ratio and draft spacing in the final drawing zone of the drawing process, the roller spacing in the roving process, and the winding tension in the winding process, etc. Based on these systematic differences, it can be seen that the lyocell yarn prepared using the method of this invention performs better in all yarn indicators and significantly reduces harmful yarn defects (defects, thick spots, and cotton spots), with the yarn quality reaching the 5% level of the Uster 2023 Bulletin. This achievement provides a reliable technical basis and practical reference for achieving high-speed, high-quality production of domestically produced lyocell fiber in conventional processes.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for producing pure spun high quality yarns of domestic lyocell fiber based on open flow process, characterized by: The domestic carded lyocell yarn is prepared by using domestic lyocell fiber as raw material, and sequentially performing the processes of cleaning, carding, head and two-ways drawing, two-ways drawing, roving, spinning, and bobbin winding, The performance indexes of the domestic carded lyocell yarn are as follows: Breaking strength: 260.4-410 cN; Single yarn breaking strength variation coefficient CV% value: 6.3-8.7%; Uster evenness variation coefficient CV% value: 9.74-11.87%; Uster evenness index fine details-40% / -50%: 1.67 / 0-65.7 / 1.4; Uster evenness index thick spots +35% / +50%: 14.6 / 0.4-59 / 4; Uster evenness index neps +140% / +200%: 27.9 / 9.6-64 / 21.

3.

2. The method of claim 1, wherein: The raw material is domestic 1.33 dtex*38 mm lyocell fiber, and the count is 30-60 English.

3. The method of claim 1, wherein: The cleaning process comprises a picking machine, a weight separator, a multi-bin cotton mixer and a fine opener arranged in sequence.

4. The method of claim 1, wherein: In the carding process, the upper air suction gap distance of the licker-in is controlled to be 2-8 mm; the distance between the licker-in and the first dust removal knife is 20-26 English; the angle between the licker-in and the second dust removal knife is 2-18°; the distance between the cylinder and the licker-in is 8 English; the distance between the back fixed flat and the cylinder is 16-24 English; the distance between the movable flat and the cylinder is 10-12 English; the distance between the front fixed flat and the cylinder is 12 English; the distance between the cylinder and the doffer is 5-7 English; the distance between the front lower cover plate and the cylinder is 26-40 English; the distance between the large sieve inlet and the large sieve outlet is 4-5 mm; the distance between the front cotton net cleaner dust removal knife and the cylinder is 12-14 English; and the distance between the guide plate and the cylinder is 40-50 English.

5. The method of claim 1, wherein: In the carding process, the speed of the movable flat is controlled to be 120-180 r / min; the speed of the cylinder is controlled to be 390-400 r / min; the speed of the licker-in is controlled to be 775-1070 r / min; the cylinder / licker-in ratio is controlled to be 1.93:1-2.2:1; the speed of the carding machine is controlled to be 105-167 m / min; and the carding weight is controlled to be 28.5-30 g / 5 m.

6. The method of claim 1, wherein: In the head and two-ways drawing process, the number of drawing is controlled to be 5, the drawing draft ratio after drawing is controlled to be 1.75 times, the drawing draft distance is controlled to be 11.5 mm*24 mm, the drawing speed of the carding machine is controlled to be 200-278 m / min, the semi-drawing weight is controlled to be 23-24 g / 5 m, and the diameter of the drawing horn is controlled to be 3.2-4.0 mm.

7. The method of claim 1, wherein: In the two-ways drawing process, the number of drawing is controlled to be 6, the drawing draft ratio after drawing is controlled to be 1.14-1.75 times, the drawing draft distance is controlled to be 14 mm*25 mm, the drawing speed of the carding machine is controlled to be 230-328 m / min, the drawing weight is controlled to be 19-20 g / 5 m, and the diameter of the drawing horn is controlled to be 3.5 mm.

8. The method of claim 1, wherein: In the roving process, the roving roller gauge is controlled to be 8mmx25mmx40mm; the back zone draft is 1.14-1.19 times; the roving frame has four rollers, and the swing frame pressures of the rollers are respectively: back roller: 150N, three roller: 150N, two roller: 250N, and front roller: 120N.

9. The method of claim 1, wherein: In the spinning process, the spinning draft gauge is controlled to be 19mmx45mm, the spinning draft multiple is 40-100 times, the gauge block is 2-2.75mm, the swing frame pressure is 180-210CN, and the compact spinning negative pressure is 2000-2800Pa.

10. The method of claim 1, wherein: In the winding process, the twisting air pressure is controlled to be 6.2-6.6bar, and the winding tension is 46-56CN.

11. The method of claim 1, wherein: In the head and two-parallel-laying processes, the roving process, the spinning process, and the winding process, the production conditions are controlled to meet: summer temperature is 28-37℃, humidity is 55-75%; winter temperature is 22-34℃, humidity is 55-70%.

12. A domestic worsted spun yarn characterized by: The method for manufacturing the domestic pure Lycra fiber yarn based on the carding process is prepared by using the method according to any one of claims 1-11.

13. Use of home-grown Prato combed yarn according to claim 12, characterized in that: The domestic carding Lycra yarn is used for manufacturing clothing and home textile products.

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