Superfine denier acrylic fiber high-count pure spinning yarn and preparation method thereof

Abstract

The invention relates to the technical field of superfine denier fiber spinning, in particular to superfine denier acrylic fiber high-count pure spun yarn and a preparation method thereof. (2) drawing process; (3) roving process; (4) spinning; (5) spooling; wherein the blowing-carding process is sequentially carried out in a disc bale plucker, a multi-bin cotton blending machine, an opening and cleaning machine, a cotton box and a carding machine, and a spraying device is additionally arranged behind a beater of the disc bale plucker; the opening and cleaning machine adopts a card wire type beater. According to the preparation method of the superfine denier acrylic fiber high-count pure spinning yarn, the blowing-carding procedure in the preparation method of the superfine denier acrylic fiber high-count pure spinning yarn is improved, static electricity accumulation in the spinning process of the superfine denier acrylic fiber high-count pure spinning yarn is reduced, fiber damage caused by low single strength of superfine denier acrylic fibers is avoided, and the spinnability of the superfine denier acrylic fibers is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-fine denier fiber spinning, and in particular to an ultra-fine denier acrylic fiber high-count pure spinning yarn and a preparation method thereof. Background Art

[0002] Synthetic fiber refers to fibers made from artificially synthesized or modified polymer compounds. Synthetic fibers can be designed and adjusted according to needs due to their physical and chemical properties. In recent years, the "six major fibers" represented by polyester, nylon, acrylic, polypropylene, vinylon and chloroprene have been widely used in various fields such as the clothing industry, industry, and agriculture. Acrylic, also known as polyacrylonitrile fiber or acrylonitrile fiber, is a synthetic fiber made of acrylonitrile and other monomers. The output of acrylic ranks third after polyester and nylon. Acrylic is known as "artificial wool" for its light weight, fluffy, warm, good resilience, and strong sunlight resistance. Textiles made of acrylic have the characteristics of low fineness, light weight, and low thermal conductivity. They are important textile raw materials for warm clothing, home textiles, and home furnishings.

[0003] With the rapid development of economy, people's requirements for quality of life are increasing day by day. Ultrafine denier acrylic fiber, with its superior softness, hygroscopicity, breathability and comfort, has not only reversed the severe trend of acrylic product manufacturers' continued downturn, but also broadened the market of acrylic products in the field of high-end textiles, and is known as the "substitute" of natural silk. Although ultrafine denier acrylic fiber has high added value of differentiation and functionality, it is difficult to achieve pure spinning production of ultrafine denier acrylic fiber due to its finer fiber fineness, lower fiber single strength, larger specific surface area and more serious static electricity of the fiber. Summary of the invention

[0004] In view of the technical problem that ultrafine denier acrylic fibers are difficult to achieve pure spinning into slivers, the present invention provides an ultrafine denier acrylic high-count pure spun yarn and a preparation method thereof. By improving the cleaning and combing process in the preparation method of the ultrafine denier acrylic high-count pure spun yarn, the static electricity accumulation of the ultrafine denier acrylic high-count pure spun yarn during the spinning process is reduced, the fiber damage of the ultrafine denier acrylic fibers caused by low single strength is avoided, and the spinnability of the ultrafine denier acrylic fibers is improved.

[0005] In a first aspect, the present invention provides a method for preparing an ultra-fine denier acrylic high-count pure spinning yarn, comprising the following steps: (1) Blowing and combing process; (2) Drawing process; (3) Roving process; (4) Spun yarn process; (5) Winding process; Among them, the cleaning and combing process is carried out in the disc plucker, multi-bin cotton mixing machine, cotton opening and cleaning machine, cotton box and cotton combing machine in sequence. The disc plucker operates periodically in a circular shape. The rotation speed of the trolley of the disc plucker is 0.96r / min, and the periodic descending stroke is 1cm / circle; the beater speed of the disc plucker is 740r / min, and a spray device is installed behind the beater of the disc plucker. The spray device evenly sprays droplets of acrylic fiber pretreatment solution into the raw material during the cotton plucking process; the cotton opening and cleaning machine adopts a combing needle beater, and the beater speed of the cotton opening and cleaning machine is 480r / min; The process parameters of the carding machine are as follows: the cylinder speed is 300r / min, the licker-in roller speed is 680r / min, the tin-to-thorn ratio is 2.27:1, the cover speed is 11.7mm / min, and the vehicle speed is 60m / min; the gauge between the licker-in roller and the cotton feeding plate is 15‰-18‰ inch silk, the gauge between the licker-in roller and the cylinder is 5‰-7‰ inch silk, the gauge between the cylinder and the doffer is 4‰-5‰ inch silk, the front fixed cover is enlarged to 12‰ inch silk, the front lower cover plate outlet gauge is 32‰-40‰ inch silk, and the carding quantity is 17.00-18.00g / 5m; the upper and lower roller gauges of the carding machine are 7‰-9‰ inch silk, and the small pressure roller pressure is the maximum value.

[0006] Furthermore, the acrylic fiber pretreatment solution is composed of purified water, an antistatic agent, wool oil and a penetrant.

[0007] Furthermore, the mass ratio of purified water, antistatic agent, crude oil and penetrant is 10:2:1:0.03.

[0008] Furthermore, the droplet diameter of the acrylic fiber pretreatment solution is 8-12 um, and the spraying speed of the spray device is 200 mL / min.

[0009] Furthermore, the card clothing of the carding machine is configured as follows: the model of the cylinder card clothing is AC1730*01740D, the model of the flat card clothing is MCH52D / M, the model of the doffer card clothing is AD4030*01890, and the model of the licker-in card clothing is AT5610*05611; Furthermore, in the drawing process, the spinning channel is subjected to antistatic pretreatment, and the method of antistatic pretreatment is to wipe the spinning channel with an antistatic treatment liquid and dry it, and the antistatic treatment liquid is a mixture of pure water and an antistatic agent, wherein the mass ratio of pure water to the antistatic agent is 10:1; the drawing process adopts the process principle of "small drafting, tight bundling, slow speed, and two-pass merging", and the total drafting multiple of the drawing is controlled within 40 times, the drawing quantity is controlled at 16.00-17.50g / 5m, and the drawing speed is controlled at 175m / min; The total drafting multiple of the first pass is 5.83-6.0 times, the total drafting multiple of the last pass is 6.12-6.5 times, the drafting multiple of the back area is 1.88-1.55 times, the drafting multiple of the back area includes the drafting multiple of the first pass back area and the drafting multiple of the last pass back area, the diameter of the bell mouth is 2.4-2.6mm, and the bell mouth includes the bell mouth of the first pass and the bell mouth of the last pass.

[0010] Furthermore, in the roving process, the drafting gauge of the roving is 11mm×26mm×34mm, the post-drafting multiple is 1.24 times, the roving twist coefficient is 48, and the roving quantity is 3.5g / 10m-5.0g / 10m. The roving process adopts the process principle of "large gauge and small twist coefficient", which can avoid the problems of poor drafting of the roving in the post-process due to the fineness and excessive cohesion between the ultra-fine denier acrylic fibers after the roving is twisted.

[0011] Furthermore, in the spinning process, the process of concentrated spinning + front and rear pressure bars is adopted, the spinning jaw is 2.0-2.25 front pressure bar + rear pressure bar, the rear zone drafting multiple is 1.17-1.21 times, the concentrated negative pressure is 3000Mpa, the steel collar is PG1 / 23854, and the model of the wire ring is Saint-Lame OSS 9 / 0-12 / 0; the spinning drafting roller is a 1:8 coating treated roller, which reduces the occurrence of the problem of broken ends and winding rollers. The present invention improves the quality of yarn evenness and yarn hairiness by regulating the process parameters of the spinning process.

[0012] Furthermore, in the winding process, the speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electric clearing parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0. The present invention reduces the strength loss of the ultra-fine denier acrylic yarn during the post-spinning production and controls the growth rate of the hairiness by regulating the process parameters of the winding process.

[0013] In the second aspect, the present invention also provides an ultra-fine denier acrylic high-count pure spun yarn prepared by the preparation method as described above, the raw material of the ultra-fine denier acrylic high-count pure spun yarn is 0.6D*38mm acrylic fiber, the count of the ultra-fine denier acrylic high-count pure spun yarn is 60-80 English count, the coefficient of variation of yarn uniformity CV is 11.50%-13.50%, the thin sections -50% is 0-8 pieces / km, the thick sections +50% is 10-25 pieces / km, the cotton knots +200% are 15-35 pieces / km, and the breaking strength is 13.0-15.5CN / tex.

[0014] The beneficial effects of the present invention are: The invention provides an ultra-fine denier acrylic high-count pure spinning yarn and a preparation method thereof. A spray device is installed behind the beater of a disc plucking machine, and droplets of an acrylic pretreatment solution are uniformly sprayed into the raw material by the spray device during the plucking process, so that the acrylic pretreatment solution and the ultra-fine denier acrylic are fully mixed in a multi-bin cotton mixer, thereby reducing the static electricity accumulation of the ultra-fine denier acrylic during the combing and drawing processes in subsequent processes, reducing the friction between the ultra-fine denier acrylic fibers and between the ultra-fine denier acrylic fibers and the spinning equipment, and improving the spinnability of the ultra-fine denier acrylic fibers; the configuration of the carding needle clothing and the setting of the carding spacing not only realize the carding of the ultra-fine denier acrylic fibers, but also avoid the damage of the ultra-fine denier acrylic fibers caused by low single strength, and solve the problem of winding around the cylinder caused by poor carding and / or transfer of the ultra-fine denier acrylic fibers; the spacing of the upper and lower rollers and the pressure of the large and small pressure rollers are adjusted, so as to avoid the problem of carding and blocking the strips and discs caused by the fluffiness of the ultra-fine denier acrylic fibers.

[0015] The present invention prepares ultra-fine denier acrylic high-count pure spinning yarn by regulating the process parameters in the cleaning and combing process, thereby providing raw materials for processing high-end textiles that are lighter, fluffier, softer and more comfortable and have heating and warmth-retaining functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a rear view of the trolley of the disc plucking machine in Example 1 of the present invention.

[0018] In the figure, 1-the trolley of the disc plucker, 2-the cotton suction pipe, 3-the beater of the disc plucker, 4-the spray device. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Example 1 Using 0.6D*38mm ultra-fine denier acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, ultra-fine denier acrylic high-count pure spinning yarn with a count of 60 Ne is prepared. The preparation method includes the following steps: (1) Cleaning and combing process Step 1-1: Prepare acrylic fiber pretreatment solution: Mix purified water, antistatic agent, wool oil and penetrant in a mass ratio of 10:2:1:0.03, stir evenly until fully dissolved and set aside. The antistatic agent is F08 silk and nylon antistatic agent purchased from Wuhan Changyu Technology Co., Ltd., and the penetrant model is SINCAL ECO-1C PLUS.

[0021] Step 1-2: Use a disc plucker, a multi-bin cotton mixer, a cotton opening and cleaning machine, a cotton box and a cotton combing machine to process the raw materials in sequence. Among them, a spray device is installed behind the beater of the disc plucker. The spray device can evenly spray droplets of acrylic pretreatment solution into the raw materials synchronously with the operation of the trolley during the cotton plucking process, and the droplet diameter of the acrylic pretreatment solution is controlled to be 8-12um. The spraying speed of the spray device is 200mL / min, so that the acrylic pretreatment solution and the ultra-fine denier acrylic fiber are fully mixed in the multi-bin cotton mixer; the disc plucker operates in a circular periodic manner, the trolley rotation speed of the disc plucker is 0.96r / min, and the periodic descending stroke is 1cm / circle; the beater speed of the disc plucker is 740r / min. The model of the cotton combing machine is FA201B.

[0022] like Figure 1 As shown, the beater 3 of the disc plucker is arranged below the cotton suction pipe 2, the cotton suction pipe 2 is installed on the trolley 1 of the disc plucker, a spray device 4 is fixed on the cotton suction pipe 2, the spray device 4 is located behind the beater 3 of the disc plucker, a cavity is provided inside the spray device 4, the cavity is used to store the acrylic fiber pretreatment solution, and a plurality of atomizing nozzles are arranged in a straight line along the horizontal direction to ensure that the acrylic fiber pretreatment solution is evenly sprayed on the raw materials treated by the beater 3 of the disc plucker.

[0023] The cotton opening and cleaning machine adopts a comb-needle type beater, and the beater speed of the cotton opening and cleaning machine is 480r / min.

[0024] The card clothing configuration of the carding machine is as follows: the model of the cylinder card clothing is AC1730*01740D, the model of the flat card clothing is MCH52D / M, the model of the doffer card clothing is AD4030*01890, and the model of the licker-in roller card clothing is AT5610*05611.

[0025] According to the card clothing configuration of the carding machine, the following process parameters are set: the cylinder speed is 300r / min, the licker-in roller speed is 680r / min, the tin-to-thorn ratio is 2.27:1, the cover speed is 11.7mm / min, and the vehicle speed is 60m / min; the gauge between the licker-in roller and the cotton feeding plate is 15‰-18‰ inch, the gauge between the licker-in roller and the cylinder is 5‰-7‰ inch, the gauge between the cylinder and the doffer is 4‰-5‰ inch, the front fixed cover is enlarged to 12‰ inch, the front lower cover plate outlet gauge is 32‰-40‰ inch, and the carding quantity is 18.00g / 5m; the upper and lower roller gauges of the carding machine are 7‰-9‰ inch, and the small pressure roller pressure is adjusted to the maximum value.

[0026] (2) Drawing process Step 2-1: Evenly mix purified water and antistatic agent in a mass ratio of 10:1 to prepare an antistatic treatment solution.

[0027] Step 2-2: Wipe the spinning channel with an antistatic treatment liquid and dry it, thereby performing antistatic pretreatment on the spinning channel.

[0028] Step 2-3: Adopt the process principle of "small draft, tight bundling, slow speed, and two-pass merging", control the total drafting multiple of the drawing within 40 times, the quantitative of the first pass of the drawing is 17.00g / 5m, and the quantitative of the last pass of the drawing is 17.50g / 5m, the drawing speed is controlled at 175m / min, the number of merging in the first pass is 6, and the number of merging in the last pass is 6, the drafting multiple of the rear area of ​​the first pass is 1.88 times, and the drafting multiple of the rear area of ​​the last pass is 1.77 times, the total drafting multiple of the first pass is 5.83-6.0 times, and the total drafting multiple of the last pass is 6.12-6.5 times, the diameter of the bell mouth of the first pass is 2.4mm, and the diameter of the bell mouth of the last pass is 2.6mm.

[0029] (3) Roving process Adopting the process principle of "large gauge and small twist coefficient", the roving drafting gauge is 11mm×26mm×34mm, the post-drafting multiple is 1.24 times, the roving twist coefficient is 48, and the roving quantity is 5.0g / 10m.

[0030] (4) Spinning process It is produced by the process of concentrated spinning + front and rear pressure bars. The spun yarn jaws are 2.25 front pressure bars + rear pressure bars, the rear zone drafting multiple is 1.21 times, the concentrated negative pressure is 3000Mpa, the steel collar is PG1 / 2 3854, the wire ring model is Saint-Lame OSS 9 / 0; the spun yarn drafting roller is a 1:8 coating treated roller.

[0031] (5) Winding process The vehicle speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electric clearing parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0.

[0032] Example 2 Using 0.6D*38mm ultra-fine denier acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, ultra-fine denier acrylic high-count pure spinning yarn with a count of 80 is prepared. The preparation method includes the following steps: (1) Cleaning and combing process Step 1-1: Prepare acrylic fiber pretreatment solution: Mix purified water, antistatic agent, wool oil and penetrant in a mass ratio of 10:2:1:0.03, stir evenly until fully dissolved and set aside. The antistatic agent is F08 silk and nylon antistatic agent purchased from Wuhan Changyu Technology Co., Ltd., and the penetrant model is SINCAL ECO-1C PLUS.

[0033] Step 1-2: Use a disc plucker, a multi-bin cotton mixer, a cotton opening and cleaning machine, a cotton box and a cotton combing machine to process the raw materials in sequence. Among them, a spray device as described in Example 1 is installed behind the beater of the disc plucker. The spray device can evenly spray droplets of acrylic pretreatment solution into the raw materials synchronously with the operation of the trolley during the cotton plucking process. The spray device evenly sprays droplets of acrylic pretreatment solution into the raw materials during the cotton plucking process, and the droplet diameter of the acrylic pretreatment solution is controlled to be 8-12um. The spraying speed of the spray device is 200mL / min, so that the acrylic pretreatment solution and the ultra-fine denier acrylic fiber are fully mixed in the multi-bin cotton mixer; the disc plucker operates in a circular periodic manner, the trolley rotation speed of the disc plucker is 0.96r / min, and the periodic descending stroke is 1cm / cycle; the beater speed of the disc plucker is 740r / min. The model of the cotton combing machine is FA201B.

[0034] The cotton opening and cleaning machine adopts a comb-needle type beater, and the beater speed of the cotton opening and cleaning machine is 480r / min.

[0035] The card clothing configuration of the carding machine is as follows: the model of the cylinder card clothing is AC1730*01740D, the model of the flat card clothing is MCH52D / M, the model of the doffer card clothing is AD4030*01890, and the model of the licker-in roller card clothing is AT5610*05611.

[0036] According to the card clothing configuration of the carding machine, the following process parameters are set: the cylinder speed is 300r / min, the licker-in roller speed is 680r / min, the tin-to-thorn ratio is 2.27:1, the cover plate speed is 11.7mm / min, and the vehicle speed is 60m / min; the gauge between the licker-in roller and the cotton feeding plate is 15‰-18‰ inch, the gauge between the licker-in roller and the cylinder is 5‰-7‰ inch, the gauge between the cylinder and the doffer is 4‰-5‰ inch, the front fixed cover is enlarged to 12‰ inch, the front lower cover plate outlet gauge is 32‰-40‰ inch, and the carding quantity is 17.00g / 5m; the upper and lower roller gauges of the carding machine are 7‰-9‰ inch, and the small pressure roller pressure is adjusted to the maximum value.

[0037] (2) Drawing process Step 2-1: Evenly mix purified water and antistatic agent in a mass ratio of 10:1 to prepare an antistatic treatment solution.

[0038] Step 2-2: Wipe the spinning channel with an antistatic treatment liquid and dry it, thereby performing antistatic pretreatment on the spinning channel.

[0039] Step 2-3: Adopt the process principle of "small draft, tight bundling, slow speed, and two-pass merging", control the total drafting multiple of the drawing within 40 times, the quantitative of the first pass of the drawing is 16.50g / 5m, the quantitative of the last pass of the drawing is 16.00g / 5m, the drawing speed is controlled at 175m / min, the number of merging in the last pass is 6, the number of merging in the last pass is 6, the drafting multiple of the rear area of ​​the first pass is 1.88 times, the drafting multiple of the rear area of ​​the last pass is 1.77 times, the total drafting multiple of the first pass is 5.83-6.0 times, the total drafting multiple of the last pass is 6.12-6.5 times, the diameter of the bell mouth of the first pass is 2.5mm, and the diameter of the bell mouth of the last pass is 2.4mm.

[0040] (3) Roving process Adopting the process principle of “large gauge and small twist coefficient”, the roving drafting gauge is 11mm×26mm×34mm, the post-drafting multiple is 1.24 times, the roving twist coefficient is 48, and the roving quantity is 3.5g / 10m.

[0041] (4) Spinning process It is produced by the process of concentrated spinning + front and rear pressure bars. The spun yarn jaws are 2.0 front pressure bars + rear pressure bars, the drafting multiple in the rear zone is 1.17 times, the concentrated negative pressure is 3000Mpa, the steel collar is PG1 / 2 3854, and the model of the wire ring is Saint-Lame OSS 12 / 0; the spun yarn drafting roller is a 1:8 coating treated roller.

[0042] (5) Winding process The vehicle speed is 1100m / min; the self-winding tension voltage is 3.5V / 2V / 0V; the electric clearing parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.0.

[0043] Comparative Example 1 Using 1.2D*38mm acrylic fiber purchased from Jilin Chemical Fiber Group Co., Ltd. as raw material, acrylic pure spinning yarn with a count of 60 Ne is prepared. The preparation method includes the following steps: (1) Acrylic fiber pretreatment Step 1-1: Prepare antistatic treatment liquid: Mix pure water and antistatic agent in a mass ratio of 100:10, stir evenly until fully dissolved and set aside.

[0044] Step 1-2: Manually spray the antistatic treatment liquid on the acrylic fiber. After spraying, turn the acrylic fiber over, and then manually spray the antistatic treatment liquid on the acrylic fiber again. Repeat the above operation several times to ensure that the antistatic treatment liquid is evenly sprayed on both sides of the acrylic fiber.

[0045] Step 1-3: placing the acrylic fiber obtained in step 1-2 in a pretreatment room for curing pretreatment for 12 hours to obtain a pretreated raw material.

[0046] (2) Cleaning and combing process First, the raw materials are pre-treated by using a cotton plucker, a mixed cotton opener, a cotton cleaner, a vibrating cotton feeder, and a single-beater lap forming machine to obtain a cotton lap with a gram weight of 410g / m 2 ; Then use a carding machine to process the cotton rolls. The carding machine uses conventional carding needle clothing, the carding speed is 30m / min, and the carding quantity is 18.50g / 5m. In order to reduce static electricity accumulation, the carding machine is shut down for 30 minutes after it is put into production again to wait for the static electricity to be released.

[0047] (3) Drawing process Step 3-1: Use antistatic treatment liquid to wipe the spinning channel every 20 minutes and dry it, so as to perform antistatic pretreatment on the spinning channel.

[0048] Step 3-2: The drawing machine speed is controlled at 150m / min, the number of first-pass drawing is 6, the number of last-pass drawing is 8, and the total drawing multiple is controlled at 51.2 times.

[0049] (4) Roving process The roving weight is 4.0g / 10m, the drafting multiple in the rear zone of the roving is 1.174 times, and the roving twist coefficient is 78.

[0050] (5) Spinning process It adopts compact spinning production, uses 2.0 front pressure bar jaws, the rear zone drafting multiple is 1.17 times, and the compact negative pressure is 2800MPA.

[0051] (6) Winding process The vehicle speed is 1100m / min, and the electric clearing parameters are N: 250%, S: 150% / 1.5, L: 40% / 40, T: -40% / 40, C±: 20% / 5.0, CC±: 25% / 5.0.

[0052] The coefficient of variation CV of yarn uniformity, thin sections -50%, thick sections +50%, cotton knots +200% and breaking strength of the pure spun yarn prepared in Examples 1-2 and Comparative Example 1 were tested respectively. The testing standard referred to the Textile Industry Standard of the People's Republic of China FZ / T12009-2011 "Acrylic Natural Yarn". The test results were compared with the superior yarn with a yarn count range of 49-60 English count in the test standard. The results are shown in Table 1.

[0053] Table 1 Quality test results of pure spun yarns prepared in Examples 1-2 and Comparative Example 1

[0054] As can be seen from Table 1, the quality indicators of the ultra-fine denier acrylic high-count pure spun yarns prepared in Examples 1 and 2 are significantly better than those of the superior yarns with a yarn count range of 49-60 in the test standard. The coefficient of variation of the yarn uniformity of 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%.

[0055] Compared with the acrylic pure spun yarn of the same count prepared in Comparative Example 1, the coefficient of variation of the yarn uniformity of the ultrafine denier acrylic high-count pure spun yarn prepared in Example 1 was reduced by 26.2%, the fine pieces 50% were reduced by 100%, the thick pieces + 50% were reduced by 83.7%, the cotton knots + 200% were reduced by 77.4%, and the breaking strength was increased by 21.1%, indicating that the quality indicators of the ultrafine denier acrylic pure spun high-count yarn prepared by the method provided by the present invention are significantly better than those of the acrylic pure spun yarn prepared by the conventional method.

[0056] Example 3 After the ultra-fine denier acrylic high-count pure spun yarn prepared in Example 1 was processed into a fabric, the weight, thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric were measured. The measurement results are shown in Table 2.

[0057] Among them, the thickness of the fabric is tested in accordance with "GB / T3820-1997 Determination of thickness of textiles and textile products"; the bulkiness is tested in accordance with "GB / T 24442.1-2009 Determination of compression properties of textiles Part 1: Constant method"; the anti-pilling performance grade is tested in accordance with "GB / T 4802.2-2008 Determination of pilling properties of textile fabrics Part 2: Modified Martindale method"; the hygroscopic and heat-generating properties are tested in accordance with "FZ / T73036-2010 Hygroscopic and heat-generating knitted underwear"; the thermal insulation rate is tested in accordance with "GB / T 11048-1989 [A method] Test method for thermal insulation properties of textiles".

[0058] Example 4 After the ultra-fine denier acrylic high-count pure spun yarn prepared in Example 2 was processed into a fabric, the weight, thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric were measured. The measurement results are shown in Table 2.

[0059] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that a pure acrylic yarn with a count of 32 prepared by a conventional method using 1.5D*38mm acrylic fiber as the raw material is used to measure the weight, thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric. The measurement results are shown in Table 2.

[0060] Comparative Example 3 The only difference between Comparative Example 3 and Example 4 is that a 40-count acrylic pure spun yarn prepared by a conventional method using 1.5D*38mm acrylic fiber as a raw material is used to measure the weight, thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric. The measurement results are shown in Table 2.

[0061] Table 2 Performance test results of fabrics obtained from Examples 3-4 and Comparative Examples 2-3

[0062] It can be seen from Table 2 that the gram weights of the fabrics obtained by processing Example 3 and Comparative Example 2 are close, the gram weights of the fabrics obtained by processing Example 4 and Comparative Example 3 are close, the thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric obtained by processing Example 3 are better than those of Comparative Example 2, and the thickness, bulkiness, anti-pilling performance, moisture absorption and heat generation performance and thermal insulation rate of the fabric obtained by processing Example 4 are better than those of Comparative Example 3, indicating that the fabric made by the yarn obtained by the preparation method provided by the present application is lighter, fluffier, softer and more comfortable, and has the function of generating heat and keeping warm.

[0063] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A method for preparing ultra-fine denier acrylic high-count pure spinning yarn, characterized in that: Including the following processes: (1) Blowing and combing process; (2) Drawing process; (3) Roving process; (4) Spun yarn process; (5) Winding process; Among them, the cleaning and combing process is carried out in the disc plucker, multi-bin cotton mixing machine, cotton opening and cleaning machine, cotton box and cotton combing machine in sequence. The disc plucker operates periodically in a circular shape. The rotation speed of the trolley of the disc plucker is 0.96r / min, and the periodic descending stroke is 1cm / circle; the beater speed of the disc plucker is 740r / min, and a spray device is installed behind the beater of the disc plucker. The spray device evenly sprays droplets of acrylic fiber pretreatment solution into the raw material during the cotton plucking process; the cotton opening and cleaning machine adopts a combing needle beater, and the beater speed of the cotton opening and cleaning machine is 480r / min; The process parameters of the carding machine are as follows: the cylinder speed is 300r / min, the licker-in roller speed is 680r / min, the tin-to-thorn ratio is 2.27:1, the cover speed is 11.7mm / min, and the vehicle speed is 60m / min; the gauge between the licker-in roller and the cotton feeding plate is 15‰-18‰ inch silk, the gauge between the licker-in roller and the cylinder is 5‰-7‰ inch silk, the gauge between the cylinder and the doffer is 4‰-5‰ inch silk, the front fixed cover is enlarged to 12‰ inch silk, the front lower cover plate outlet gauge is 32‰-40‰ inch silk, and the carding quantity is 17.00-18.00g / 5m; the upper and lower roller gauges of the carding machine are 7‰-9‰ inch silk, and the small pressure roller pressure is the maximum value.

2. The preparation method according to claim 1, characterized in that The acrylic fiber pretreatment solution consists of purified water, antistatic agent, wool 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 um, and the spraying speed of the spray device is 200 mL / min.

5. The preparation method according to claim 1, characterized in that: The card clothing configuration of the carding machine is as follows: the model of the cylinder card clothing is AC1730*01740D, the model of the flat card clothing is MCH52D / M, the model of the doffer card clothing is AD4030*01890, and the model of the licker-in roller card clothing is AT5610*05611.

6. The preparation method according to claim 1, characterized in that: In the drawing process, the spinning channel is pretreated with antistatic treatment; the total drawing multiple is controlled within 40 times, the drawing weight is controlled at 16.00-17.50g / 5m, and the drawing speed is controlled at 175m / min; The total drafting multiple of the first pass is 5.83-6.0 times, the total drafting multiple of the last pass is 6.12-6.5 times, the drafting multiple of the rear zone is 1.88-1.55 times, and the diameter of the bell mouth is 2.4-2.6mm.

7. The preparation method according to claim 1, characterized in that: In the roving process, the roving drafting gauge is 11mm×26mm×34mm, the post-drafting multiple is 1.24 times, the roving twist coefficient is 48, and the roving quantity is 3.5g / 10m-5.0g / 10m.

8. The preparation method according to claim 1, characterized in that In the spinning process, the concentrated spinning + front and rear pressure rod process is adopted. The spinning jaws are 2.0-2.25 front pressure rod + rear pressure rod, the rear zone drafting multiple is 1.17-1.21 times, the concentrated negative pressure is 3000Mpa, the steel collar is PG1 / 2 3854, and the wire ring model is Saint-Lame OSS 9 / 0-12 / 0; the spinning drafting roller is a 1:8 coating treated roller.

9. 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 electric clearing parameters are N: 240%, S: 130% / 1.3, L: 40% / 30, T: -40% / 40, C±: 18% / 5.0, CC±: 22% / 5.

0.

10. An ultra-fine denier acrylic high-count pure spinning yarn prepared by the preparation method according to any one of claims 1 to 9, characterized in that: The raw material of ultra-fine denier acrylic high-count pure spun yarn is 0.6D*38mm acrylic fiber. The count of ultra-fine denier acrylic high-count pure spun yarn is 60-80 Ne, the coefficient of variation of yarn evenness CV is 11.50%-13.50%, the thin sections -50% is 0-8 pieces / km, the thick sections +50% is 10-25 pieces / km, the cotton sections +200% is 15-35 pieces / km, and the breaking strength is 13.0-15.5CN / tex.

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