Superfine denier acrylic high count pure spun yarn and preparation method thereof

Abstract

The present application relates to the technical field of ultra-fine denier fiber spinning, and particularly relates to an ultra-fine denier acrylic high-count pure spinning yarn and a preparation method thereof, comprising (1) a picking process; (2) a doubling process; (3) a roving process; (4) a spinning process; and (5) a winding process; wherein the picking process is sequentially performed in a disc grabber, a multi-warehouse cotton mixer, an opening and cleaning machine, a cotton box and a carding machine, and a spraying device is additionally installed at the rear of the beater of the disc grabber; and the opening and cleaning machine adopts a carding needle type beater. The present application improves the picking process in the preparation method of the ultra-fine denier acrylic high-count pure spinning yarn, reduces the static electricity accumulation of the ultra-fine denier acrylic high-count pure spinning yarn in the spinning process, avoids the fiber damage of the ultra-fine denier acrylic fiber caused by single strength, and improves the spinnability of the ultra-fine denier acrylic fiber.

Description

Technical Field

[0001] This invention relates to the field of ultrafine denier fiber spinning technology, specifically to an ultrafine denier high-count pure spun acrylic yarn and its preparation method. Background Technology

[0002] Synthetic fibers are fibers made from artificially synthesized or modified polymer compounds. Because their physical and chemical properties can be designed and adjusted as needed, synthetic fibers, represented by the "six major fibers"—polyester, nylon, acrylic, polypropylene, vinylon, and chlorofiber—have been widely used in various fields such as clothing, industry, and agriculture in recent years. Acrylic fiber, also known as polyacrylonitrile fiber or acrylonitrile fiber, is a synthetic fiber made from acrylonitrile and other monomers. Acrylic fiber's production ranks third, after polyester and nylon. Acrylic fiber is known as "artificial wool" due to its lightweight, fluffy texture, warmth, good resilience, and strong sun resistance. Textiles made from acrylic fiber have low fiber density, light weight, and low thermal conductivity, making them important textile raw materials for thermal clothing, home textiles, and furniture.

[0003] With rapid economic development and rising demands for quality of life, ultrafine denier acrylic fiber, with its superior softness, moisture absorption, breathability, and comfort, has not only reversed the severe downturn in acrylic product manufacturing but also expanded the market for acrylic products in the high-end textile sector, earning it the title of a "cost-effective alternative" to natural silk. While ultrafine denier acrylic fiber boasts high added value through differentiation and functionality, its finer fiber size, lower single strength, larger specific surface area, and more severe static electricity make it difficult to produce pure slivers. Summary of the Invention

[0004] To address the technical problem of the difficulty in producing pure slivers from ultrafine denier acrylic fibers, this invention provides a method for preparing high-count pure spun ultrafine denier acrylic yarn. By improving the cleaning and combing process in the preparation method of high-count pure spun ultrafine denier acrylic yarn, the static electricity accumulation of high-count pure spun ultrafine denier acrylic yarn during the spinning process is reduced, fiber damage caused by low single strength of ultrafine denier acrylic fibers is avoided, and the spinnability of ultrafine denier acrylic fibers is improved.

[0005] In a first aspect, the present invention provides a method for preparing ultrafine denier high-count pure spun acrylic yarn, comprising the following steps:

[0006] (1) Cleaning and combing process; (2) Drawing process; (3) Roving process; (4) Spinning process; (5) Winding process;

[0007] The cleaning and combing process is carried out sequentially in the disc cotton grabber, multi-bin cotton blender, cotton opener, cotton box, and carder. The disc cotton grabber operates in a circular, periodic manner, with a trolley rotation speed of 0.96 r / min and a cycle descent stroke of 1 cm / cycle. The beater speed of the disc cotton grabber is 740 r / min, and a spraying device is installed behind the beater to evenly spray droplets of acrylic fiber pretreatment solution into the raw material during the cotton grabbing process. The cotton opener uses a comb needle-type beater, and the beater speed of the cotton opener is 480 r / min.

[0008] The process parameters of the carding machine are as follows: cylinder speed is 300 r / min, licker-in speed is 680 r / min, licker-in ratio is 2.27:1, flats speed is 11.7 mm / min, machine speed is 60 m / min; the distance between the licker-in and the feed plate is 15‰-18‰ filaments, the distance between the licker-in and the cylinder is 5‰-7‰ filaments, the distance between the cylinder and the doffer is 4‰-5‰ filaments, the front fixed flats are enlarged to 12‰ filaments, the outlet distance of the front lower cover is 32‰-40‰ filaments, and the carding weight is 17.00-18.00 g / 5m; the distance between the upper and lower rollers of the carding machine is 7‰-9‰ filaments, and the pressure of the small pressure roller is at its maximum value.

[0009] Furthermore, the acrylic fiber pretreatment solution consists of purified water, an antistatic agent, crude oil, and a penetrant.

[0010] Furthermore, the mass ratio of purified water, antistatic agent, crude oil, and penetrant is 10:2:1:0.03.

[0011] Furthermore, the droplet diameter of the acrylic fiber pretreatment solution is 8-12 μm, and the spraying speed of the spraying device is 200 mL / min.

[0012] Furthermore, the carding machine is configured with the following carding cloths: the cylinder carding cloth is model AC1730*01740D, the cover carding cloth is model MCH52D / M, the doffer carding cloth is model AD4030*01890, and the licker-in carding cloth is model AT5610*05611.

[0013] Furthermore, in the drawing process, the spinning channel undergoes antistatic pretreatment. The antistatic pretreatment method involves wiping the spinning channel with an antistatic treatment solution and then air-drying it. The antistatic treatment solution is a mixture of pure water and an antistatic agent, with a mass ratio of pure water to antistatic agent of 10:1. The drawing process adopts the process principle of "small draft, tight bundling, slow speed, and two-stage merging". The total draft ratio of the drawing is controlled within 40 times, the drawing basis weight is controlled at 16.00-17.50 g / 5m, and the drawing speed is controlled at 175 m / min.

[0014] The total draft ratio for the first pass is 5.83-6.0, the total draft ratio for the last pass is 6.12-6.5, and the draft ratio for the rear zone is 1.88-1.55. The rear zone draft ratio includes the draft ratio for the rear zone of the first pass and the draft ratio for the rear zone of the last pass. The diameter of the bell mouth is 2.4-2.6 mm, and the bell mouth includes the bell mouth of the first pass and the bell mouth of the last pass.

[0015] Furthermore, in the roving process, the roving drafting spacing is 11mm×26mm×34mm, the subsequent drafting ratio is 1.24, the roving twist coefficient is 48, and the roving basis weight is 3.5g / 10m-5.0g / 10m. The roving process adopts the principle of "large spacing, small twist coefficient," which avoids problems such as poor roving drafting in subsequent processes caused by the fineness and excessive cohesion of the ultra-fine denier acrylic fibers after roving twisting.

[0016] Furthermore, in the spinning process, a concentrated spinning + front and rear pressure bar process is adopted. The spinning nip is 2.0-2.25 with a front pressure bar + a rear pressure bar, the back zone draft ratio is 1.17-1.21, the concentrated negative pressure is 3000 MPa, the ring is PG1 / 23854, and the traveler model is Saint-Laurent OSS 9 / 0-12 / 0. The spinning draft roller is a 1:8 coated roller, which reduces the occurrence of roller breakage and entanglement problems. This invention improves the quality of yarn straightness and yarn hairiness by controlling the process parameters of the spinning process.

[0017] Furthermore, in the winding process, the machine speed is 1100 m / min; the self-winding tension voltage is 3.5V / 2V / 0V; and the electro-cleaning parameters are: N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0. This invention reduces strength loss and controls the hairiness growth rate during the spinning of ultra-fine denier acrylic yarn by adjusting the process parameters of the winding process.

[0018] Secondly, the present invention also provides an ultrafine denier acrylic high-count pure spun yarn prepared by the preparation method described above. The raw material of the ultrafine denier acrylic high-count pure spun yarn is 0.6D*38mm acrylic fiber. The yarn count is 60-80 English count, the coefficient of variation (CV) for evenness is 11.50%-13.50%, the number of fine spots (-50%) is 0-8 per km, the number of thick spots (+50%) is 10-25 per km, the number of neps (+200%) is 15-35 per km, and the breaking strength is 13.0-15.5 CN / tex.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention provides a method for preparing ultra-fine denier high-count pure spun acrylic yarn. By adding a spray device behind the beater of a disc cotton picker, the sprayer evenly sprays droplets of acrylic pretreatment solution into the raw material during the cotton picking process. This ensures thorough mixing of the acrylic pretreatment solution and ultra-fine denier acrylic in a multi-compartment blender, reducing static electricity buildup during subsequent carding and drafting processes. This lowers friction between ultra-fine denier acrylic fibers and between the fibers and the spinning equipment, improving the spinnability of the fibers. The carding wire configuration and carding spacing settings achieve both carding of the ultra-fine denier acrylic and prevent fiber damage due to low single strength. This also solves the problem of the fibers getting tangled in the cylinder due to poor carding and / or transfer of ultra-fine denier acrylic fibers. Adjustments to the upper and lower roller spacing and the pressure of the large and small pressure rollers prevent carding blockage caused by the looseness of the ultra-fine denier acrylic fibers.

[0021] This invention produces ultra-fine denier high-count pure spun acrylic yarn by adjusting the process parameters in the cleaning and combing process, providing raw materials for processing higher-end textiles that are lighter, fluffier, softer, more comfortable, and have heat-generating and heat-retaining functions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a rear view of the trolley of the disc cotton grabber in Embodiment 1 of the present invention.

[0024] In the diagram, 1-the trolley of the disc cotton grabber, 2-the cotton suction pipe, 3-the beater of the disc cotton grabber, and 4-the spraying device. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0026] Example 1

[0027] Using 0.6D*38mm ultrafine denier acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, a high-count pure spun ultrafine denier acrylic yarn with a count of 60 English count was prepared. The preparation method includes the following steps:

[0028] (1) Cleaning and combing process

[0029] Step 1-1: Prepare the acrylic fiber pretreatment solution: Mix purified water, antistatic agent, crude oil, and penetrant in a mass ratio of 10:2:1:0.03, and stir until fully dissolved. The antistatic agent is F08 yarn / fiber antistatic agent purchased from Wuhan Changyu Technology Co., Ltd., and the penetrant is SINCAL ECO-1C PLUS.

[0030] Steps 1-2: Process the raw materials sequentially using a disc cotton grabber, a multi-compartment blender, an opener / cleaner, a cotton box, and a carding machine. A spray device is installed behind the beater of the disc cotton grabber. This spray device evenly sprays droplets of acrylic fiber pretreatment solution onto the raw materials synchronously with the movement of the trolley during the cotton grabbing process. The droplet diameter of the acrylic fiber pretreatment solution is controlled to be 8-12 μm, and the spraying speed is 200 mL / min, ensuring thorough mixing of the acrylic fiber pretreatment solution and ultra-fine denier acrylic fibers within the multi-compartment blender. The disc cotton grabber operates in a circular, periodic manner, with a trolley rotation speed of 0.96 r / min and a cycle descent distance of 1 cm / cycle. The beater speed of the disc cotton grabber is 740 r / min. The carding machine model is FA201B.

[0031] like Figure 1 As shown, the beater 3 of the disc cotton grabber is located below the cotton suction pipe 2, which is installed on the trolley 1 of the disc cotton grabber. A spraying device 4 is fixed on the cotton suction pipe 2 and is located behind the beater 3 of the disc cotton grabber. The spraying device 4 has a cavity inside for storing acrylic fiber pretreatment solution. Several atomizing nozzles are provided on the outside of the spraying device 4. The atomizing nozzles are arranged in a straight line in the horizontal direction to ensure that the acrylic fiber pretreatment solution is evenly sprayed on the raw material processed by the beater 3 of the disc cotton grabber.

[0032] The cotton opening and cleaning machine uses a comb-type beater, and the beater speed of the cotton opening and cleaning machine is 480 r / min.

[0033] The carding machine is equipped with the following carding cloths: cylinder carding cloth model AC1730*01740D, cover carding cloth model MCH52D / M, doffer carding cloth model AD4030*01890, and licker-in carding cloth model AT5610*05611.

[0034] Based on the carding cloth configuration of the carding machine, the following process parameters are set: cylinder speed is 300 r / min, licker-in speed is 680 r / min, licker-in ratio is 2.27:1, flats speed is 11.7 mm / min, machine speed is 60 m / min; the distance between the licker-in and the feed plate is 15‰-18‰ filaments, the distance between the licker-in and the cylinder is 5‰-7‰ filaments, the distance between the cylinder and the doffer is 4‰-5‰ filaments, the front fixed flats are enlarged to 12‰ filaments, the outlet distance of the front lower cover is 32‰-40‰ filaments, and the carding weight is 18.00 g / 5m; the distance between the upper and lower rollers of the carding machine is 7‰-9‰ filaments, and the pressure of the small pressure roller is adjusted to the maximum value.

[0035] (2) Drawing process

[0036] Step 2-1: Mix pure water and antistatic agent at a mass ratio of 10:1 to prepare an antistatic treatment solution.

[0037] Step 2-2: Wipe the spinning channel with an antistatic treatment solution and let it dry to perform antistatic pretreatment on the spinning channel.

[0038] Steps 2-3: Adopting the process principle of "small drafting, tight bundling, slow speed, and two-stage merging", the total draft ratio of the sliver is controlled within 40 times. The weight of the first sliver is 17.00g / 5m, the weight of the last sliver is 17.50g / 5m, the sliver speed is controlled at 175m / min, the number of slivers merged in the first stage is 6, the number of slivers merged in the last stage is 6, the draft ratio of the rear zone of the first stage is 1.88 times, the draft ratio of the rear zone of the last stage is 1.77 times, the total draft ratio of the first stage is 5.83-6.0 times, the total draft ratio of the last stage is 6.12-6.5 times, the diameter of the bell mouth of the first stage is 2.4mm, and the diameter of the bell mouth of the last stage is 2.6mm.

[0039] (3) Roving process

[0040] Adopting the process principle of "large spacing and small twist coefficient", the roving draft spacing is 11mm×26mm×34mm, the back draft ratio is 1.24 times, the roving twist coefficient is 48, and the roving weight is 5.0g / 10m.

[0041] (4) Spinning process

[0042] It is produced using a concentrated spinning + front and rear pressure bar process. The yarn nip is 2.25 front pressure bar + rear pressure bar, the back zone draft ratio is 1.21, the concentrated negative pressure is 3000Mpa, the ring is PG1 / 2 3854, and the traveler model is Saint-Laurent OSS 9 / 0; the yarn drafting roller is a 1:8 coated roller.

[0043] (5) Winding process

[0044] The vehicle speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electrical discharge parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0.

[0045] Example 2

[0046] Using 0.6D*38mm ultrafine denier acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, high-count pure spun yarn of ultrafine denier acrylic fiber with a count of 80 English count was prepared. The preparation method includes the following steps:

[0047] (1) Cleaning and combing process

[0048] Step 1-1: Prepare the acrylic fiber pretreatment solution: Mix purified water, antistatic agent, crude oil, and penetrant in a mass ratio of 10:2:1:0.03, and stir until fully dissolved. The antistatic agent is F08 yarn / fiber antistatic agent purchased from Wuhan Changyu Technology Co., Ltd., and the penetrant is SINCAL ECO-1C PLUS.

[0049] Steps 1-2: Process the raw materials sequentially using a disc cotton grabber, a multi-compartment blender, an opener / cleaner, a cotton box, and a carding machine. The disc cotton grabber is equipped with a spraying device as described in Example 1, installed behind the beater. This spraying device synchronously and evenly sprays droplets of the acrylic fiber pretreatment solution onto the raw materials during the cotton grabbing process, controlling the droplet diameter to 8-12 μm. The spraying speed is 200 mL / min, ensuring thorough mixing of the acrylic fiber pretreatment solution and ultra-fine denier acrylic fibers within the multi-compartment blender. The disc cotton grabber operates in a circular, periodic manner, with a trolley rotation speed of 0.96 r / min and a cycle descent distance of 1 cm / cycle. The beater speed is 740 r / min. The carding machine is model FA201B.

[0050] The cotton opening and cleaning machine uses a comb-type beater, and the beater speed of the cotton opening and cleaning machine is 480 r / min.

[0051] The carding machine is equipped with the following carding cloths: cylinder carding cloth model AC1730*01740D, cover carding cloth model MCH52D / M, doffer carding cloth model AD4030*01890, and licker-in carding cloth model AT5610*05611.

[0052] Based on the carding cloth configuration of the carding machine, the following process parameters are set: cylinder speed is 300 r / min, licker-in speed is 680 r / min, licker-in ratio is 2.27:1, flats speed is 11.7 mm / min, machine speed is 60 m / min; the distance between the licker-in and the feed plate is 15‰-18‰ filaments, the distance between the licker-in and the cylinder is 5‰-7‰ filaments, the distance between the cylinder and the doffer is 4‰-5‰ filaments, the front fixed flats are enlarged to 12‰ filaments, the front lower cover outlet distance is 32‰-40‰ filaments, and the carding weight is 17.00 g / 5m; the distance between the upper and lower rollers of the carding machine is 7‰-9‰ filaments, and the pressure of the small pressure roller is adjusted to the maximum value.

[0053] (2) Drawing process

[0054] Step 2-1: Mix pure water and antistatic agent at a mass ratio of 10:1 to prepare an antistatic treatment solution.

[0055] Step 2-2: Wipe the spinning channel with an antistatic treatment solution and let it dry to perform antistatic pretreatment on the spinning channel.

[0056] Steps 2-3: Adopting the process principle of "small drafting, tight bundling, slow speed, and two-stage merging", the total draft ratio of the sliver is controlled within 40 times. The weight of the first sliver is 16.50g / 5m, the weight of the last sliver is 16.00g / 5m, the sliver speed is controlled at 175m / min, and the number of slivers merged in the last stage is 6. The draft ratio of the rear zone after the first stage is 1.88 times, the draft ratio of the rear zone after the last stage is 1.77 times, the total draft ratio of the first stage is 5.83-6.0 times, the total draft ratio of the last stage is 6.12-6.5 times, the diameter of the bell mouth of the first stage is 2.5mm, and the diameter of the bell mouth of the last stage is 2.4mm.

[0057] (3) Roving process

[0058] Adopting the process principle of "large spacing and small twist coefficient", the roving draft spacing is 11mm×26mm×34mm, the back draft ratio is 1.24 times, the roving twist coefficient is 48, and the roving weight is 3.5g / 10m.

[0059] (4) Spinning process

[0060] It is produced using a concentrated spinning + front and rear pressure bar process. The yarn nip is a 2.0 front pressure bar + rear pressure bar, the back zone draft ratio is 1.17, the concentrated negative pressure is 3000Mpa, the ring is PG1 / 2 3854, and the traveler is Saint-Laurent OSS 12 / 0. The yarn drafting roller is a 1:8 coated roller.

[0061] (5) Winding process

[0062] The vehicle speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electrical discharge parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0.

[0063] Comparative Example 1

[0064] Using 1.2D*38mm acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, a 60-count acrylic pure spun yarn was prepared. The preparation method includes the following steps:

[0065] (1) Pretreatment of acrylic fibers

[0066] Step 1-1: Prepare antistatic treatment solution: Mix pure water and antistatic agent at a mass ratio of 100:10, stir until fully dissolved and set aside.

[0067] Steps 1-2: Manually spray antistatic treatment liquid onto the acrylic fiber. After spraying, turn the acrylic fiber over and manually spray the antistatic treatment liquid onto the acrylic fiber again. Repeat the above operation several times to ensure that the antistatic treatment liquid is evenly sprayed onto both sides of the acrylic fiber.

[0068] Steps 1-3: Place the acrylic fibers obtained in Step 1-2 in a pretreatment room for 12 hours to obtain pretreated raw materials.

[0069] (2) Cleaning and combing process

[0070] First, the pre-treated raw materials are processed sequentially using a cotton grabber, a cotton opener, a cotton cleaner, a vibrating feeder, and a single-hand lap forming machine to produce cotton laps with a weight of 410 g / m². 2 Then, the cotton lap is processed using a carding machine. The carding machine uses conventional carding cloth, the carding speed is 30m / min, and the carding weight is 18.50g / 5m. In order to reduce static electricity accumulation, the carding machine is stopped every 30 minutes of production to wait for the static electricity to be released before it is put back into production.

[0071] (3) Drawing process

[0072] Step 3-1: Wipe the spinning channel with antistatic treatment solution every 20 minutes and let it dry to perform antistatic pretreatment on the spinning channel.

[0073] Step 3-2: Control the speed of the drawing machine at 150m / min, the number of slivers to be drawn in the first pass is 6, the number of slivers to be drawn in the last pass is 8, and control the total draw ratio of the drawing machine at 51.2 times.

[0074] (4) Roving process

[0075] The roving weight is 4.0 g / 10 m, the roving back zone draft ratio is 1.174, and the roving twist coefficient is 78.

[0076] (5) Spinning process

[0077] It is produced by intensive spinning, using a 2.0 front pressure bar clamp, a rear draft ratio of 1.17, and an intensive negative pressure of 2800 MPa.

[0078] (6) Winding process

[0079] The vehicle speed is 1100m / min, and the electronic cleaning parameters are: N: 250%, S: 150% / 1.5, L: 40% / 40, T: -40% / 40, C±: 20% / 5.0, CC±: 25% / 5.0.

[0080] The coefficient of variation (CV) of yarn evenness, fine spots (-50%), thick spots (+50%), neps (+200%), and breaking strength of the pure spun yarns prepared in Examples 1-2 and Comparative Example 1 were tested respectively. The testing standard referred to the People's Republic of China Textile Industry Standard FZ / T12009-2011 "Acrylic Yarn". The test results were compared with those of superior yarn with a yarn count range of 49-60 English count in the testing standard. The results are shown in Table 1.

[0081] Table 1. Quality test results of pure spun yarns prepared in Examples 1-2 and Comparative Example 1

[0082]

[0083] As shown in Table 1, the quality indicators of the ultrafine denier acrylic high-count pure spun yarns prepared in Examples 1 and 2 are significantly better than those of the superior yarn with a count range of 49-60 English count in the testing standard. The coefficient of variation of yarn evenness in Examples 1 and 2 is reduced by 34.3%-22.9% compared with the superior yarn, and the breaking strength of the yarn is increased by 3.8%-19.2%.

[0084] Compared with the acrylic pure yarn of the same count prepared in Comparative Example 1, the evenness variation coefficient of the ultrafine denier acrylic high-count pure yarn prepared in Example 1 decreased by 26.2%, the fineness 50% decreased by 100%, the thickness +50% decreased by 83.7%, the neps +200% decreased by 77.4%, and the breaking strength increased by 21.1%. This indicates that the quality indicators of the ultrafine denier acrylic pure high-count yarn prepared by the method provided by the present invention are significantly better than those of acrylic pure yarn prepared by conventional methods.

[0085] Example 3

[0086] After the ultrafine denier high-count pure spun acrylic yarn prepared in Example 1 was processed into fabric, the fabric's weight, thickness, bulkiness, anti-pilling and anti-fuzzing properties, moisture absorption and heat generation properties, and heat retention rate were measured. The results are shown in Table 2.

[0087] The fabric thickness was tested according to GB / T3820-1997 Determination of thickness of textiles and textile products; the bulkiness was tested according to GB / T 24442.1-2009 Determination of compression properties of textiles - Part 1: Constant method; the anti-pilling performance grade was tested according to GB / T 4802.2-2008 Determination of pilling properties of textiles - Part 2: Modified Martindale method; the moisture absorption and heat generation performance was tested according to FZ / T73036-2010 Moisture-absorbing and heat-generating knitted underwear; and the heat retention rate was tested according to GB / T 11048-1989 [Method A] Test method for heat retention performance of textiles.

[0088] Example 4

[0089] After the ultrafine denier high-count pure spun acrylic yarn prepared in Example 2 was processed into fabric, the fabric's weight, thickness, bulkiness, anti-pilling and anti-fuzzing properties, moisture absorption and heat generation properties, and heat retention rate were measured. The results are shown in Table 2.

[0090] Comparative Example 2

[0091] The difference between Comparative Example 2 and Example 3 is that 32-count acrylic pure yarn was prepared using conventional methods with 1.5D*38mm acrylic fiber as raw material. The weight, thickness, bulkiness, anti-pilling and anti-fuzzing properties, moisture absorption and heat generation properties and heat retention rate of the fabric were measured. The test results are shown in Table 2.

[0092] Comparative Example 3

[0093] The only difference between Comparative Example 3 and Example 4 is that 40-count acrylic pure yarn was prepared using conventional methods with 1.5D*38mm acrylic fiber as raw material. The weight, thickness, bulkiness, anti-pilling and anti-fuzzing properties, moisture absorption and heat generation properties and heat retention rate of the fabric were measured. The results are shown in Table 2.

[0094] Table 2 Performance test results of fabrics obtained in Examples 3-4 and Comparative Examples 2-3

[0095]

[0096] As shown in Table 2, the weight of the fabrics processed in Example 3 and Comparative Example 2 is similar, and the weight of the fabrics processed in Example 4 and Comparative Example 3 is similar. The fabric processed in Example 3 has better thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance, and heat retention rate than Comparative Example 2. The fabric processed in Example 4 has better thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance, and heat retention rate than Comparative Example 3. This indicates that the fabrics processed from the yarns obtained by the preparation method provided in this application are lighter, bulkier, softer, more comfortable, and have heat generation and heat retention functions.

[0097] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A method for preparing ultrafine denier high-count pure spun acrylic yarn, characterized in that, The process includes the following steps: (1) Cleaning and combing process; (2) Drawing process; (3) Roving process; (4) Spinning process; (5) Winding process; The cleaning and combing process is carried out sequentially in the disc cotton grabber, multi-bin cotton blender, cotton opener, cotton box, and carder. The disc cotton grabber operates in a circular, periodic manner, with a trolley rotation speed of 0.96 r / min and a cycle descent stroke of 1 cm / cycle. The beater speed of the disc cotton grabber is 740 r / min, and a spraying device is installed behind the beater to evenly spray droplets of acrylic fiber pretreatment solution into the raw material during the cotton grabbing process. The cotton opener uses a comb needle-type beater, and the beater speed of the cotton opener is 480 r / min. The process parameters of the carding machine are as follows: cylinder speed is 300 r / min, licker-in speed is 680 r / min, licker-in ratio is 2.27:1, flats speed is 11.7 mm / min, machine speed is 60 m / min; the distance between the licker-in and the feed plate is 15‰-18‰ filaments, the distance between the licker-in and the cylinder is 5‰-7‰ filaments, the distance between the cylinder and the doffer is 4‰-5‰ filaments, the front fixed flats are enlarged to 12‰ filaments, the outlet distance of the front lower cover is 32‰-40‰ filaments, and the carding weight is 17.00-18.00 g / 5m; the distance between the upper and lower rollers of the carding machine is 7‰-9‰ filaments. In the drawing process, the spinning channel is pretreated with antistatic agents; the total draw ratio of the drawing is controlled within 40 times, the drawing weight is controlled within 16.00-17.50 g / 5m, and the drawing speed is controlled within 175 m / min. The total draft ratio for the first pass is 5.83-6.0, the total draft ratio for the last pass is 6.12-6.5, the draft ratio for the rear zone is 1.88-1.55, and the diameter of the bell mouth is 2.4-2.6 mm. In the roving process, the roving drafting interval is 11mm×26mm×34mm, the back drafting ratio is 1.24 times, the roving twist coefficient is 48, and the roving weight is 3.5g / 10m-5.0g / 10m; In the spinning process, the back zone draft ratio is 1.17-1.21, and the negative pressure is 3000 MPa; The count of the ultra-fine denier acrylic high-count pure spun yarn is 60-80 English count.

2. The preparation method according to claim 1, characterized in that, The acrylic fiber pretreatment solution consists of purified water, antistatic agent, crude oil, and penetrant.

3. The preparation method according to claim 2, characterized in that, The mass ratio of purified water, antistatic agent, crude oil, and penetrant is 10:2:1:0.

03.

4. The preparation method according to claim 1, characterized in that, The droplet diameter of the acrylic fiber pretreatment solution is 8-12 μm, and the spraying speed of the spraying device is 200 mL / min.

5. The preparation method according to claim 1, characterized in that, The carding machine is equipped with the following carding cloths: cylinder carding cloth model AC1730*01740D, cover carding cloth model MCH52D / M, doffer carding cloth model AD4030*01890, and licker-in carding cloth model AT5610*05611.

6. The preparation method according to claim 1, characterized in that, In the spinning process, the production process is carried out using a combination of concentrated spinning and front and rear pressure bars. The ring is PG1 / 2 3854, and the traveler is Saint-Laurent OSS 9 / 0-12 / 0. The spinning drafting roller is a 1:8 coated roller.

7. The preparation method according to claim 1, characterized in that, During the winding process, the machine speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electro-cleaning parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.

0.

8. A high-count, ultrafine denier acrylic yarn prepared by the method according to any one of claims 1-7, characterized in that, The raw material for ultra-fine denier high-count pure spun acrylic yarn is 0.6D*38mm acrylic fiber. The yarn count is 60-80 English count, the coefficient of variation (CV) for yarn evenness is 11.50%-13.50%, the number of fine spots (-50%) is 0-8 per km, the number of thick spots (+50%) is 10-25 per km, the number of neps (+200%) is 15-35 per km, and the breaking strength is 13.0-15.5 CN / tex.

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