A production process of a vortex spinning super-high denier yarn

Abstract

The application relates to a production process of a vortex spinning super-high-count yarn and belongs to the technical field of vortex spinning. The production process comprises the following steps: first, selecting lyocell staple fibers and cotton; then, respectively performing opening, cleaning, carding and drawing processes on the lyocell fibers and the cotton; and finally, performing air-jet vortex spinning to smoothly form yarns from the fibers, so that a super-high-count 120-count yarn is prepared. The preparation method is simple, and the steps are easy to operate. Through the adjustment of the opening, cleaning and carding in the pre-spinning process, stable, uniform and high-regularity fiber slivers are provided for the air-jet vortex spinning. The air pressure of the nozzle in the vortex spinning, the distance between the front roller and the spinning spindle and the adjustment of the spinning spindle aperture are adjusted, so that the preparation of the super-high-count 120-count air-jet vortex spun yarn is realized.

Description

Technical Field

[0001] This invention belongs to the field of vortex spinning technology, specifically relating to a production process for vortex spinning of extra-high count yarn. Background Technology

[0002] Vortex-spun yarn has a structure where the outer layer of fibers is spirally wound into yarn, while the inner layer contains some untwisted new fibers. The number of times the twisted fibers in the outer layer transfer between the inner and outer layers is less than in ring-spun yarn, resulting in a looser yarn structure and more relative slippage between fibers. Therefore, air-jet vortex-spun yarn has lower strength than ring-spun yarn, and the finer the yarn, the more pronounced the decrease in strength.

[0003] Currently, jet vortex spinning is suitable for yarn counts of 10-80. Due to the fine yarn count, the small number of fibers in a single yarn cross-section, and the low yarn formation capacity, coupled with the limitation of the spinning tension of the vortex spinning equipment itself (the winding tension of vortex spinning is 60 cN), it is impossible to form 120 count vortex yarn. Summary of the Invention

[0004] The present invention aims to solve the problem that 120 count vortex yarn cannot be spun in the existing air jet vortex spinning process, and provides a production process for vortex spinning of extra-high count yarn.

[0005] This invention adopts the following technical solution: a production process for vortex-spun extra-high count yarn, comprising the following steps:

[0006] (1) Raw material selection: Lyocell staple fiber and cotton were selected as raw materials respectively;

[0007] (2) Opening and cleaning cotton: When processing lyocell fiber, the speed of the cotton grabber is 850-950 r / min, the speed of the multi-bin cotton blender is 340-380 r / min, the speed of the cotton opener is 340-380 r / min, the distance between the cotton-pulling knife and the beater is 3.2-3.8 mm, the distance between the dust bar and the beater is 12-15 mm, and the air pressure of the cotton feeding fan is 230-270 kPa. When processing cotton, the beater speed is lower than that of lyocell fiber, and the distance between the beater and the cotton feeding roller, the distance between the beater and the dust bar, and the distance between the dust bars are higher than those of lyocell fiber.

[0008] (3) Carding: The process parameters for carding Lyocell fibers are: cylinder speed 340-380 r / min, licker-in speed 820-860 r / min, flats speed 200-240 mm / min, sliver speed 60-80 m / min. Dense toothed card cloth is used to increase the number of neps and short fibers during the fiber carding process. When carding cotton fibers, the height of the feed plate is raised by 2-3 mm, the distance between the licker-in and the dust removal knife is reduced, the licker-in speed is reduced, and the licker-in ratio is increased. The process parameters for carding are: cylinder speed 310-350 r / min, licker-in speed 750-800 r / min, cylinder-flats distance 6, 5, 5, 5, 5, 6, and sliver weight 15.0-15.5 g / 5m.

[0009] (4) Drawing: Lyocell and cotton are drawn together in a sliver blending manner and then drawn three times to obtain fiber slivers with good parallelism and evenness;

[0010] (5) Air jet vortex spinning: Cotton fiber is used as the outer fiber and Lyocell fiber is used as the core fiber. The spinning speed is 330-360 m / min, the nozzle air pressure is 0.3-0.7 MPa, the distance between the front roller and the spindle is 18-22 mm, and the spindle aperture is 0.8-0.9 mm. 120 count air jet vortex yarn is prepared.

[0011] Furthermore, the mass ratio of the lyocell fiber to cotton is 60-65:35-40.

[0012] Furthermore, in step (1), the specifications of the lyocell fiber are 0.9 dtex×38mm, the hand-torn length of the cotton fiber is greater than 33mm, the maturity rate is greater than 90%, and the short fiber rate is less than 8%.

[0013] Furthermore, during the combing process, the sliver weight of Lyocell fiber is 14g / 5m, and the sliver has 5 neps / g.

[0014] Furthermore, in step (3) of the cotton combing process, the pre-drawing sliver is made of 5 slivers, the back zone draft ratio is 1.6 times, the total draft ratio is less than 7 times, and the sliver roll draft ratio is 1.3 times.

[0015] Furthermore, in step (3), the cylinder speed of the cotton combing is 250-300 nips / min, a short cotton feeding process is configured, and the cotton waste rate is 14-16%.

[0016] The advantages of this invention are as follows:

[0017] (1) The opening and cleaning process and the carding process are adjusted in the pre-spinning process. The speed of each beater in the opening and cleaning process is lower than that of Lyocell fiber, and the distance between the beater and the feed roller, the distance between the beater and the dust bar, and the distance between the dust bar and the dust bar are higher than those of Lyocell fiber. This achieves the effect of reducing cotton knots and provides stable, uniform and neat fiber slivers for air jet vortex spinning.

[0018] (2) In the air jet vortex spinning process, the nozzle air pressure of the vortex spinning was adjusted to 0.48-0.52 m / min, the distance between the front roller and the spindle was 19-20.5 mm, and the spindle orifice diameter was 0.8-0.9 mm, thus realizing the preparation of 120 count air jet vortex spinning yarn. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described below in conjunction with specific examples.

[0020] Example 1: A production process for vortex-spun high-count yarn includes the following steps:

[0021] (1) Raw material selection: 65% fine Lyocell short fiber and 35% cotton are selected, of which the Lyocell fiber specification is 0.9dtex×38mm, the cotton fiber hand-pulled length is controlled above 33mm, the maturity rate is greater than 0.9%, and the short fiber rate should be controlled below 8%;

[0022] (2) Opening and cleaning cotton: Lyocell fiber adopts the principle of "frequent grabbing and thin feeding, more combing and less beating, gentle opening and uniform mixing" to reduce the generation of short fibers and cotton knots during the cotton grabbing and opening process. The conveying air pressure is reduced during the cotton flow conveying process to ensure smooth cotton flow, reduce the collision between fibers and pipes, and reduce the production of cotton knots. The process is as follows: After processing by FA002D type disc type cotton grabbing machine, the cotton grabbing machine beater speed is 900 r / min. The cotton flow enters FA022-6 type multi-bin cotton blending machine, the beater speed of the multi-bin cotton blending machine is 360 r / min. The cotton flow finally enters FA1102 type cotton opener, the cotton opener beater speed is 360 r / min, the cotton knife ~ beater distance is 3.5 mm, the dust bar ~ beater distance is 13 mm, and the cotton feeder air pressure is 250 KPa.

[0023] The cotton processing follows the principles of "precise cotton picking, more loosening and less beating, early dropping and less breakage, and thin feeding and light beating" to fully loosen and mix the fibers, reducing fiber damage. Appropriately reduce the speed of each beater to increase the operating efficiency of each individual machine (above 90%); maintain a relatively large distance between the beater and the feed roller, between the beater and the dust bar, and between dust bars to improve impurity removal efficiency and effectively eliminate short fibers and harmful defects. Reduce the distance the blades extend beyond the ribs and shorten the downward stroke each time to achieve more frequent but less picking, reducing the weight of cotton clumps; the operating efficiency of the cotton picker, cotton opener, and cotton feeder should be maintained above 90%.

[0024] (3) Carding process: Lyocell fiber is carded using the principle of "high efficiency, gentle carding, light weight, and slow speed". The speeds of each part of the carding machine are as follows: cylinder speed 360 r / min, licker-in speed 840 r / min, flats speed 220 mm / min, and sliver speed 80 m / min.

[0025] The cotton is combed according to the principle of "thorough combing, smooth transfer, effective removal of impurities and short fibers, and reduction of fiber damage" to improve the clarity of the cotton web and reduce cotton knots in the sliver;

[0026] The main parameters of the carding process are: cylinder speed 330r / min, licker-up roller speed 780r / min, cylinder-to-cover plate spacing 6, 5, 5, 5, 5, 6, and sliver weight 15.5g / 5m;

[0027] (4) Drawing process: Three drawing processes are adopted: first drawing, second drawing and last drawing, of which the first drawing and second drawing result in 6 pieces, and the last drawing and middle drawing result in 8 pieces;

[0028] (5) Jet vortex spinning: Using high-speed rotating airflow, the end of the fiber sliver is separated from the front roller holding point to form a free end fiber. The free end fiber is twisted into yarn. The spinning speed is 360-400m / min, the nozzle air pressure intensity is 0.5MPa, the distance between the front roller and the spindle is 20mm, and the spindle orifice diameter is 0.85mm. Example 2

[0029] The raw materials were selected as 60% fine terecell short fiber and 40% cotton, and the remaining steps were the same as in Example 1.

[0030] During cotton opening and cleaning: the speed of the cotton grabber for lyocell short fiber is 850 r / min, the speed of the multi-bin cotton blender is 340 r / min, the speed of the cotton opener is 340 r / min, the distance between the cotton-pulling knife and the beater is 3.2 mm, the distance between the dust bar and the beater is 12 mm, and the air pressure of the cotton feeding fan is 230 kPa.

[0031] Carding: The process parameters for carding Lyocell fibers are: cylinder speed 340 r / min, licker-in speed 820 r / min, flats speed 200 mm / min, and sliver speed 60 m / min.

[0032] The carding process parameters are as follows: cylinder speed is 310 r / min, licker-in speed is 750 r / min, cylinder-to-flat plate spacing is 6, 5, 5, 5, 5, 6, and sliver weight is 15.0 g / 5m.

[0033] Air-jet vortex spinning: Cotton fiber is used as the outer sheath fiber and Lyocell fiber is used as the core fiber. The spinning speed is 330m / min, the nozzle air pressure is 0.48MPa, the distance between the front roller and the spindle is 19mm, and the spindle aperture is 0.8mm. 120 count air-jet vortex yarn is produced. Example 3

[0034] 62% fine terecell short fiber and 38% cotton were selected as raw materials, and the remaining steps were the same as in Example 1.

[0035] During cotton cleaning: the speed of the cotton grabber for lyocell short fiber is 950 r / min, the speed of the multi-bin cotton blender is 380 r / min, the speed of the cotton opener is 380 r / min, the distance between the cotton-pulling knife and the beater is 3.8 mm, the distance between the dust bar and the beater is 15 mm, and the air pressure of the cotton feeding fan is 270 kPa.

[0036] Carding: The process parameters for carding Lyocell fibers are: cylinder speed 380 r / min, licker-in speed 860 r / min, flats speed 240 mm / min, and sliver speed 80 m / min.

[0037] The carding process parameters are as follows: cylinder speed is 350 r / min, licker-in speed is 800 r / min, cylinder-flat plate spacing is 6, 5, 5, 5, 5, 6, and sliver weight is 15.5 g / 5m.

[0038] Air-jet vortex spinning: Cotton fiber is used as the outer sheath fiber and Lyocell fiber is used as the core fiber. The spinning speed is 360m / min, the nozzle air pressure is 0.52MPa, the distance between the front roller and the spindle is 20.5mm, and the spindle orifice diameter is 0.9mm. 120 count air-jet vortex yarn is produced.

[0039] The 120-count yarn made from lyocell fiber and cotton blend prepared in Example 1 was tested, and the results are shown in Table 1.

[0040] Table 1 Yarn Performance Test Table

[0041]

[0042] As shown in Table 1, the optimization of the air jet vortex spinning process has improved the quality of the fiber sliver, providing stable, uniform, and highly consistent fiber slivers for air jet vortex spinning. This has improved the yarn structure, enhanced the yarn-forming capacity of 120-count air jet vortex yarn, broken through the yarn-forming limit of 80-count and above, and expanded the application fields of vortex-spun yarn. Compared with traditional yarns, 120-count yarns are smoother, have a softer and smoother fabric, better drape, brighter colors, and are more wear-resistant.

Claims

1. A production process for vortex-spun high-count yarn, characterized in that: Includes the following steps: (1) Raw material selection: Lyocell staple fiber and cotton were selected as raw materials respectively; (2) Cotton opening and cleaning: When processing Lyocell fiber: the speed of the cotton grabber is 850-950 r / min, the speed of the multi-bin cotton blender is 340-380 r / min, the speed of the cotton opener is 340-380 r / min, the distance between the cotton-pulling knife and the beater is 3.2-3.8 mm, the distance between the dust bar and the beater is 12-15 mm, and the air pressure of the cotton feeding fan is 230-270 kPa; When processing cotton: the beater speed is lower than that of Lyocell fiber, and the distance between the beater and the cotton feeding roller, the distance between the beater and the dust bar, and the distance between the dust bars are higher than those of Lyocell fiber. (3) Carding: The process parameters for carding Lyocell fibers are: cylinder speed 340-380 r / min, licker-in speed 820-860 r / min, flats speed 200-240 mm / min, sliver speed 60-80 m / min. Dense toothed card cloth is used to increase the number of neps and short fibers during the fiber carding process. When carding cotton fibers, the height of the feed plate is raised by 2-3 mm, the distance between the licker-in and the dust removal knife is reduced, the licker-in speed is reduced, and the licker-in ratio is increased. The process parameters for carding are: cylinder speed 310-350 r / min, licker-in speed 750-800 r / min, cylinder-flats distance 6, 5, 5, 5, 5, 6, and sliver weight 15.0-15.5 g / 5m. (4) Drawing: Lyocell fiber and cotton are drawn together in a sliver blending manner and then drawn three times to obtain fiber slivers with good parallelism and evenness; (5) Air jet vortex spinning: Cotton fiber is used as the outer fiber and Lyocell fiber is used as the core fiber. The spinning speed is 330-360m / min, the nozzle air pressure is 0.48-0.52MPa, the distance between the front roller and the spindle is 19-20.5mm, and the spindle orifice diameter is 0.8-0.9mm. 120 count air jet vortex yarn is prepared. The mass ratio of lyocell fiber to cotton is 60-65:35-40; in step (1), the specifications of the lyocell fiber are 0.9 dtex×38mm, the hand-pulled length of the cotton fiber is greater than 33mm, the maturity rate is greater than 90%, and the short fiber rate is less than 8%; In step (1), the sliver weight of Lyocell fiber during combing is 14g / 5m, and the sliver neps are 5 per g. In step (3), the pre-drawing of slivers during cotton combing involves 5 slivers being drawn together, the back zone draft ratio is 1.6 times, the total draft ratio is less than 7 times, and the sliver lap draft ratio is 1.3 times. In step (3), the cylinder speed of cotton combing is 250-300 nips / min, a short cotton feeding process is configured, and the cotton waste rate is 14-16%.

Images