Acrylic wool top and preparation method thereof

Abstract

The invention relates to the technical field of wool top processing, in particular to an acrylic wool top and a preparation method thereof.The preparation method comprises the following steps that S1, acrylic fibers are taken to be subjected to impurity removal and opening pretreatment; s2, carding and slivering the pretreated acrylic fibers to obtain acrylic fiber primary wool tops; s3, pre-drafting the primary acrylic wool tops, wherein the draft ratio is 1.2-1.5; s4, carrying out raising treatment on the pre-drafted primary acrylic wool tops; s5, carrying out padding treatment on the wool tops subjected to raising treatment by adopting a polyurethane anti-pilling finishing agent; s6, the wool tops subjected to anti-pilling treatment are subjected to shaping treatment, and the anti-pilling wool tops are obtained. According to the method, raising treatment is directly carried out on the acrylic wool tops, intermediate procedures such as spinning and weaving are not needed, multiple procedures such as carding, drawing, roving, spinning and weaving which are necessary in an existing napping and sanding process are omitted, a polyurethane finishing agent with a specific proportion is adopted in the anti-pilling treatment procedure, the anti-pilling performance of the product is remarkably improved, and the anti-pilling effect is good. And the anti-pilling grade can reach more than 4 grade through testing.

Description

Technical Field

[0001] This invention relates to the field of wool top processing technology, and in particular to an acrylic wool top and its preparation method. Background Technology

[0002] Acrylic fiber possesses excellent properties such as softness, warmth, and lightness, and its napped products are widely used in clothing, home textiles, and other fields. Nailing is a key process that gives acrylic products a soft feel and a fluffy appearance. Currently, acrylic top napping mainly employs brushing or abrasive processes.

[0003] The napping process typically involves multiple steps, including carding, drawing, roving, spinning, weaving, pre-shrinking, napping, and setting. The napping step requires the use of a napping machine's card cloth to repeatedly comb the fabric surface, exposing the fibers and creating a velvety feel. However, it has significant drawbacks: the uneven tension on the fibers during napping can easily lead to fiber breakage and the formation of short fibers. These short fibers are prone to falling off and pilling during subsequent use or washing, severely affecting the product's lifespan and appearance. The brushing process, on the other hand, involves using a high-speed rotating grinding wheel to grind the surface of the acrylic sliver after weaving, causing the fiber ends to break evenly and form a velvety feel. This process also requires multiple steps, including weaving, pretreatment, brushing, and finishing.

[0004] Compared to napping, the napping process produces acrylic slivers with shorter and denser fibers, more uniform fiber stress, and controllable breaking length, resulting in superior anti-pilling properties. However, traditional napping also suffers from cumbersome procedures. To achieve the desired napping effect, multiple pre-carding and pre-stretching processes are typically required, followed by multiple napping treatments, leading to a lengthy production process and low efficiency.

[0005] Therefore, developing a napping process for acrylic fibers that can reduce pilling and improve production efficiency while ensuring napping quality has become a pressing technical problem in this field. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide an acrylic fiber top and its preparation method, so as to reduce the problem of pilling and fuzzing of the top, while reducing the production process and improving the quality of the napped top product.

[0007] To achieve the above objectives, the present invention provides a method for preparing acrylic fiber tops, comprising the following steps:

[0008] S1. Take acrylic fibers and perform impurity removal and opening pretreatment;

[0009] S2. The pretreated acrylic fiber is combed and spun into slivers to obtain acrylic fiber slivers;

[0010] S3. Pre-stretch the acrylic fiber sliver to a stretch ratio of 1.2-1.5.

[0011] S4. The pre-stretched acrylic fiber sliver is then treated with napping.

[0012] S5. The napped tops are treated with a polyurethane anti-pilling finishing agent by padding.

[0013] S6. After anti-pilling treatment, the lint strips are shaped to obtain the desired product.

[0014] In S1, impurity removal is carried out by airflow with an airflow velocity of 2-3 m / s, and opening is carried out by a comb opener with an opening roller speed of 600-800 r / min.

[0015] During the S2 combing process, the cylinder speed should be controlled at 350-450 r / min, and the doffer speed at 20-30 r / min.

[0016] Before pre-stretching in step S3, the acrylic fiber sliver is sent into a conditioning chamber for humidification. The relative humidity in the conditioning chamber is controlled at 60-70%, the temperature at 25-30℃, and the conditioning time is 20-30 minutes.

[0017] The drawing temperature in S3 is 50-60℃, and the drawing speed is 8-12m / min.

[0018] The S4 napping process involves feeding pre-stretched acrylic slivers into a napping machine, where they are napped by spiral needle rollers; the needle density of the spiral needle rollers is 800-1200 needles / m. 3 The needle roller speed is 1500-2000 r / min, the sliver feed speed is 5-8 m / min, the distance between the needle roller and the sliver is 0.5-1 mm, and the napping process is cooled with cold air at 10-15℃.

[0019] The S4 napping process involves directly feeding the pre-stretched acrylic sliver into a combined napping machine, where it undergoes both napping and brushing treatments. The napping parameters are as follows: napping roller speed is 800-1000 r / min, the distance between the napping roller and the sliver is 0.5-1.0 mm, and the napping temperature is 40-50℃. The brushing parameters are as follows: brushing roller speed is 1200-1500 r / min, the distance between the brushing roller and the sliver is 0.3-0.8 mm, and the brushing temperature is 50-60℃.

[0020] The concentration of the pilling agent in S5 is 8-12 g / L, the rolling temperature is 35-45℃, the roll residue is 60-70%, and it is pre-dried at 80-90℃ for 3-5 min after rolling.

[0021] The anti-pilling finishing agent is a polyurethane-based anti-pilling finishing agent.

[0022] Preferably, 0.05-2 wt% N,N'-methylenebisacrylamide and 3-8 wt% polysiloxane emulsion are added to the polyurethane anti-pilling finishing agent. The addition of N,N'-methylenebisacrylamide forms a three-dimensional network structure, synergistically stabilizing the pile morphology and further solving the problem of easy pilling.

[0023] The S6 uses heat setting for the shaping process, with the temperature controlled at 120-140℃, the setting time at 3-5 minutes, and the setting pressure at 0.2-0.3MPa.

[0024] The present invention also provides an acrylic fiber top, which is prepared by the aforementioned preparation method.

[0025] The beneficial effects of this invention are:

[0026] 1. This invention directly napps acrylic fiber tops without the need for intermediate processes such as spinning and weaving. It eliminates the multiple steps required in existing napping and brushing processes, including combing, drawing, roving, spinning, and weaving. The anti-pilling treatment uses a specifically formulated polyurethane finishing agent that forms a dense protective film on the fiber surface. Simultaneously, it synergistically works with N,N'-methylenebisacrylamide and polysiloxane emulsion to form a three-dimensional network structure, significantly improving the product's anti-pilling performance. Testing shows an anti-pilling grade of 4 or higher. After heat setting, the tops exhibit good dimensional stability and are less prone to deformation, resulting in product quality superior to products prepared using traditional napping and brushing processes. This invention, while adding anti-pilling functionality, maintains the core advantages of simplified processes, high efficiency, and low waste, while offering superior anti-pilling performance and making the overall product quality more competitive.

[0027] 2. By reasonably controlling the process parameters of each stage, such as pretreatment, moisture conditioning, pre-stretching, and napping, fiber damage can be effectively avoided. The napped acrylic fibers have a uniform feel, good fluffiness, and a soft hand feel.

[0028] 3. By organically combining the napping and brushing processes, the sealed napping guide channel of the napping equipment connects the napping and brushing mechanisms, reducing the exposure and friction damage of the nap during process transitions, and lowering the probability of nap breakage and fiber scattering; at the same time, by reasonably matching the process parameters of napping and brushing, the nap on the surface of the nap is made more uniform and fluffy. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0031] Example 1

[0032] A method for preparing acrylic fiber sliver includes the following steps:

[0033] Raw material pretreatment: Acrylic fibers with a fineness of 1.5 dtex and a length of 38 mm are selected and opened and impurity removed. Impurities are removed by airflow removal at a speed of 2.5 m / s. The opening process is carried out by an opening machine with a drum speed of 700 r / min.

[0034] Carding and sliver preparation: The pre-opened acrylic fiber material is fed into a carding machine, and the cylinder speed is controlled at 400 r / min and the doffer speed at 25 r / min to obtain a coarse combed sliver. The coarse combed sliver is then fed into a carding machine to obtain a combed acrylic fiber sliver with a uniformity of 90% and a weight deviation of ±2%.

[0035] Pre-stretching and setting: The acrylic fiber sliver is fed into the drafting machine and pre-stretched under the conditions of drafting temperature 55℃, drafting speed 10m / min, and drafting ratio 1.3 times;

[0036] Direct napping: The pre-stretched acrylic fiber top is fed into a napping machine, where the needle density of the spiral needle rollers is 900 needles / m. 3 The needle roller speed is 1700 r / min, the sliver feed speed is 6 m / min, and the distance between the needle roller and the sliver is 0.8 mm; during the napping process, cold air at 10℃ is introduced for cooling, and the wind speed is 2 m / s;

[0037] Anti-pilling treatment: The napped acrylic tops are fed into an anti-pilling treatment device and treated with a polyurethane anti-pilling finishing agent with a concentration of 10 g / L, a padding temperature of 38℃, and a padding rate controlled at 65%. After padding, pre-drying is performed at a temperature of 80℃ for 4 minutes. The anti-pilling finishing agent consists of 60 parts of waterborne polyurethane, 8 parts of polysiloxane emulsion, and 100 parts of deionized water.

[0038] Finishing: The anti-pilling acrylic fiber tops are sent into a hot air circulating finishing machine. The finishing temperature is 130℃, the hot air velocity is 1.5m / s, the finishing time is 5min, and the finishing pressure is 0.25MPa. After finishing, the fibers are allowed to cool naturally to room temperature.

[0039] Slitting and Packaging: The shaped napped acrylic tops are slid into rolls, each weighing 10kg, and then packaged and stored.

[0040] Example 2

[0041] A method for preparing acrylic fiber sliver includes the following steps:

[0042] Raw material pretreatment: Acrylic fibers with a fineness of 1.5 dtex and a length of 38 mm are selected and opened and impurity removed. Impurities are removed by airflow removal at a speed of 2.5 m / s. The opening process is carried out by an opening machine with a drum speed of 700 r / min.

[0043] Carding and sliver preparation: The pre-opened acrylic fiber material is fed into a carding machine, and the cylinder speed is controlled at 400 r / min and the doffer speed at 25 r / min to obtain a coarse combed sliver. The coarse combed sliver is then fed into a carding machine to obtain a combed acrylic fiber sliver with a uniformity of 90% and a weight deviation of ±2%.

[0044] Humidification and conditioning: The acrylic fiber tops are sent into the conditioning chamber, and the relative humidity in the conditioning chamber is controlled at 65%, the temperature at 25℃, and the conditioning time is 25 minutes, so that the moisture regain of the tops reaches 12%;

[0045] Pre-stretching and setting: The conditioned acrylic fiber sliver is fed into the drafting machine and pre-stretched under the conditions of drafting temperature 55℃, drafting speed 10m / min, and drafting ratio 1.3 times;

[0046] Direct napping: The pre-stretched acrylic fiber top is fed into a napping machine, where the needle density of the spiral needle rollers is 900 needles / m. 3 The needle roller speed is 1700 r / min, the sliver feed speed is 6 m / min, and the distance between the needle roller and the sliver is 0.8 mm; during the napping process, cold air at 10℃ is introduced for cooling, and the wind speed is 2 m / s;

[0047] Anti-pilling treatment: The napped acrylic tops are fed into an anti-pilling treatment device and treated with a polyurethane anti-pilling finishing agent with a concentration of 10 g / L, a padding temperature of 38℃, and a roll-off rate controlled at 65%. After padding, pre-drying is performed at a temperature of 80℃ for 4 minutes. The anti-pilling finishing agent consists of 60 parts of waterborne polyurethane, 10 parts of polysiloxane emulsion, 0.5 parts of N,N'-methylenebisacrylamide, and 100 parts of deionized water.

[0048] Finishing: The anti-pilling acrylic fiber tops are sent into a hot air circulating finishing machine. The finishing temperature is 130℃, the hot air velocity is 1.5m / s, the finishing time is 5min, and the finishing pressure is 0.25MPa. After finishing, the fibers are allowed to cool naturally to room temperature.

[0049] Slitting and Packaging: The shaped napped acrylic tops are slid into rolls, each weighing 10kg, and then packaged and stored.

[0050] Example 3

[0051] A method for preparing acrylic fiber sliver includes the following steps:

[0052] Raw material pretreatment: Acrylic fibers with a fineness of 1.5 dtex and a length of 38 mm are selected and opened and impurity removed. Impurities are removed by airflow removal at a speed of 2.5 m / s. The opening process is carried out by an opening machine with a drum speed of 700 r / min.

[0053] Carding and sliver preparation: The pre-opened acrylic fiber material is fed into a carding machine, and the cylinder speed is controlled at 400 r / min and the doffer speed at 25 r / min to obtain a coarse combed sliver. The coarse combed sliver is then fed into a carding machine to obtain a combed acrylic fiber sliver with a uniformity of 90% and a weight deviation of ±2%.

[0054] Humidification and conditioning: The acrylic fiber tops are sent into the conditioning chamber, and the relative humidity in the conditioning chamber is controlled at 65%, the temperature at 25℃, and the conditioning time is 25 minutes, so that the moisture regain of the tops reaches 10%;

[0055] Pre-stretching and setting: The conditioned acrylic fiber sliver is fed into the drafting machine and pre-stretched under the conditions of drafting temperature of 55℃, drafting speed of 10m / min, and drafting ratio of 1.5 times.

[0056] Direct napping: The pre-stretched acrylic fiber top is fed into a napping machine, where the needle density of the spiral needle rollers is 900 needles / m. 3 The needle roller speed is 1700 r / min, the sliver feed speed is 6 m / min, and the distance between the needle roller and the sliver is 0.8 mm; during the napping process, cold air at 10℃ is introduced for cooling, and the wind speed is 2 m / s;

[0057] Anti-pilling treatment: The napped acrylic tops are fed into an anti-pilling treatment device and treated with a polyurethane anti-pilling finishing agent with a concentration of 10 g / L, a padding temperature of 38℃, and a roll-off rate controlled at 65%. After padding, pre-drying is performed at a temperature of 80℃ for 4 minutes. The anti-pilling finishing agent consists of 60 parts of waterborne polyurethane, 10 parts of polysiloxane emulsion, 0.5 parts of N,N'-methylenebisacrylamide, and 100 parts of deionized water.

[0058] Finishing: The anti-pilling acrylic fiber tops are sent into a hot air circulating finishing machine. The finishing temperature is 120℃, the hot air velocity is 1.5m / s, the finishing time is 4min, and the finishing pressure is 0.25MPa. After finishing, the fibers are allowed to cool naturally to room temperature.

[0059] Slitting and Packaging: The shaped napped acrylic tops are slid into rolls, each weighing 10kg, and then packaged and stored.

[0060] Example 4

[0061] A method for preparing acrylic fiber sliver includes the following steps:

[0062] Raw material pretreatment: Acrylic fibers with a fineness of 1.5 dtex and a length of 38 mm are selected and opened and impurity removed. Impurities are removed by airflow removal at a speed of 2.5 m / s. The opening process is carried out by an opening machine with a drum speed of 700 r / min.

[0063] Carding and sliver preparation: The pre-opened acrylic fiber material is fed into a carding machine, and the cylinder speed is controlled at 400 r / min and the doffer speed at 25 r / min to obtain a coarse combed sliver. The coarse combed sliver is then fed into a carding machine to obtain a combed acrylic fiber sliver with a uniformity of 90% and a weight deviation of ±2%.

[0064] Humidification and conditioning: The acrylic fiber tops are sent into the conditioning chamber, and the relative humidity in the conditioning chamber is controlled at 65%, the temperature at 25℃, and the conditioning time is 25 minutes, so that the moisture regain of the tops reaches 12%;

[0065] Pre-stretching and setting: The conditioned acrylic fiber sliver is fed into the drafting machine and pre-stretched under the conditions of drafting temperature of 55℃, drafting speed of 10m / min, and drafting ratio of 1.5 times.

[0066] Nail raising process: The pre-stretched acrylic fiber sliver is fed into the napping equipment, where it undergoes napping and abrasioning processes sequentially. Nail raising parameters: napping roller speed 800 r / min, distance between the napping roller and the fiber sliver 1.0 mm, napping temperature 45℃, and elastic needle density of 200 needles / cm² on the napping roller surface. Abrasioning parameters: abrasioning roller speed 1200 r / min, distance between the abrasioning roller and the fiber sliver 0.8 mm, abrasioning temperature 50℃, and abrasive cloth mesh count of 400 mesh on the abrasioning roller surface. Fiber sliver conveying speed is 8 m / min. The napping and abrasioning mechanisms of the napping equipment are connected by a sealed fiber guide channel, with the temperature within the channel controlled at 45℃.

[0067] Anti-pilling treatment: The napped acrylic tops are fed into an anti-pilling treatment device and treated with a polyurethane anti-pilling finishing agent with a concentration of 10 g / L, a padding temperature of 38℃, and a roll-off rate controlled at 65%. After padding, pre-drying is performed at a temperature of 80℃ for 4 minutes. The anti-pilling finishing agent consists of 60 parts of waterborne polyurethane, 10 parts of polysiloxane emulsion, 0.5 parts of N,N'-methylenebisacrylamide, and 100 parts of deionized water.

[0068] Finishing: The anti-pilling acrylic fiber tops are sent into a hot air circulating finishing machine. The finishing temperature is 120℃, the hot air velocity is 1.5m / s, the finishing time is 4min, and the finishing pressure is 0.25MPa. After finishing, the fibers are allowed to cool naturally to room temperature.

[0069] Slitting and Packaging: The shaped napped acrylic tops are slid into rolls, each weighing 10kg, and then packaged and stored.

[0070] Example 5

[0071] A method for preparing acrylic fiber sliver includes the following steps:

[0072] Raw material pretreatment: Acrylic fibers with a fineness of 1.5 dtex and a length of 38 mm are selected and opened and impurity removed. Impurities are removed by airflow removal at a speed of 2.5 m / s. The opening process is carried out by an opening machine with a drum speed of 700 r / min.

[0073] Carding and sliver preparation: The pre-opened acrylic fiber material is fed into a carding machine, and the cylinder speed is controlled at 400 r / min and the doffer speed at 25 r / min to obtain a coarse combed sliver. The coarse combed sliver is then fed into a carding machine to obtain a combed acrylic fiber sliver with a uniformity of 90% and a weight deviation of ±2%.

[0074] Pre-stretching and setting: The acrylic fiber sliver is fed into the drafting machine and pre-stretched under the conditions of drafting temperature 55℃, drafting speed 10m / min, and drafting ratio 1.5 times;

[0075] Nail raising process: The pre-stretched acrylic fiber sliver is fed into the napping equipment, where it undergoes napping and abrasioning processes sequentially. Nail raising parameters: napping roller speed 800 r / min, distance between the napping roller and the fiber sliver 1.0 mm, napping temperature 45℃, and elastic needle density of 200 needles / cm² on the napping roller surface. Abrasioning parameters: abrasioning roller speed 1200 r / min, distance between the abrasioning roller and the fiber sliver 0.8 mm, abrasioning temperature 50℃, and abrasive cloth mesh count of 400 mesh on the abrasioning roller surface. Fiber sliver conveying speed is 8 m / min. The napping and abrasioning mechanisms of the napping equipment are connected by a sealed fiber guide channel, with the temperature within the channel controlled at 45℃.

[0076] Anti-pilling treatment: The napped acrylic tops are fed into an anti-pilling treatment device and treated with a polyurethane anti-pilling finishing agent with a concentration of 10 g / L, a padding temperature of 38℃, and a roll-off rate controlled at 65%. After padding, pre-drying is performed at a temperature of 80℃ for 4 minutes. The anti-pilling finishing agent consists of 60 parts of waterborne polyurethane, 10 parts of polysiloxane emulsion, 0.5 parts of N,N'-methylenebisacrylamide, and 100 parts of deionized water.

[0077] Finishing: The anti-pilling acrylic fiber tops are sent into a hot air circulating finishing machine. The finishing temperature is 120℃, the hot air velocity is 1.5m / s, the finishing time is 4min, and the finishing pressure is 0.25MPa. After finishing, the fibers are allowed to cool naturally to room temperature.

[0078] Slitting and Packaging: The shaped napped acrylic tops are slid into rolls, each weighing 10kg, and then packaged and stored.

[0079] The finished acrylic napped tops prepared in Examples 1-5 above were subjected to performance tests, including pilling grade, breaking strength, and softness. Acrylic napped tops prepared by traditional napping and traditional brushing processes were used as control groups. The test results are shown in the table below:

[0080]

[0081] The test results above show that the acrylic napped tops prepared by this invention achieve a pilling grade of 4.0 or higher, exhibit superior breaking strength compared to products manufactured using traditional napping processes, and comparable softness, demonstrating excellent overall performance. Furthermore, the process of this invention involves fewer steps than traditional napping and brushing processes, resulting in a significantly shorter production cycle. In terms of bulkiness, this process also surpasses traditional processes. Especially in terms of anti-pilling performance, the products prepared using this process achieve an anti-pilling grade of 4.0. This fully demonstrates that while adding anti-pilling functionality, this invention maintains the core advantages of simplified processes, high efficiency, and low waste, while offering superior anti-pilling effects and making the overall product quality more competitive.

[0082] The anti-pilling performance test was conducted according to GB / T 4802.1-2008 standard. The test conditions were: load of 12 kPa, abrasive of standard wool cloth, and 1000 cycles of friction. The integrated anti-pilling treatment process used in this invention, compared to the separate anti-pilling finishing process in traditional processes, requires no additional complex equipment. Furthermore, the finishing agent bonds more tightly to the fibers, ensuring the anti-pilling effect while having less impact on the product's bulkiness.

[0083] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for preparing acrylic fiber tops, characterized in that, Includes the following steps: S1. Take acrylic fibers and perform impurity removal and opening pretreatment; S2. The pretreated acrylic fiber is combed and spun into slivers to obtain acrylic fiber slivers; S3. Pre-stretch the acrylic fiber sliver to a stretch ratio of 1.2-1.

5. S4. The pre-stretched acrylic fiber sliver is then treated with napping. S5. The napped tops are treated with an anti-pilling finishing agent by padding. S6. After anti-pilling treatment, the lint strips are shaped to obtain the desired product.

2. The method for preparing acrylic fiber tops according to claim 1, characterized in that, In S1, impurity removal is carried out by airflow with an airflow velocity of 2-3 m / s, and opening is carried out by a comb opener with an opening roller speed of 600-800 r / min.

3. The method for preparing acrylic fiber tops according to claim 1, characterized in that, During the S2 combing process, the cylinder speed should be controlled at 350-450 r / min, and the doffer speed at 20-30 r / min.

4. The method for preparing acrylic fiber tops according to claim 1, characterized in that, Before pre-stretching in step S3, the acrylic fiber sliver is sent into a conditioning chamber for humidification. The relative humidity in the conditioning chamber is controlled at 60-70%, the temperature at 25-30℃, and the conditioning time is 20-30 minutes.

5. The method for preparing acrylic fiber tops according to claim 1, characterized in that, The drawing temperature in S3 is 50-60℃, and the drawing speed is 8-12m / min.

6. The method for preparing acrylic fiber tops according to claim 1, characterized in that, The S4 napping process involves feeding pre-stretched acrylic slivers into a napping machine, where they are napped by spiral needle rollers; the needle density of the spiral needle rollers is 800-1200 needles / m. 3 The needle roller speed is 1500-2000 r / min, the sliver feed speed is 5-8 m / min, the distance between the needle roller and the sliver is 0.5-1 mm, and the napping process is cooled with cold air at 10-15℃.

7. The method for preparing acrylic fiber tops according to claim 1, characterized in that, The S4 napping process involves directly feeding the pre-stretched acrylic sliver into the napping equipment, where it undergoes both napping and brushing processes sequentially. The napping parameters are as follows: napping roller speed is 800-1000 r / min, the distance between the napping roller and the sliver is 0.5-1.0 mm, and the napping temperature is 40-50℃. The brushing parameters are as follows: brushing roller speed is 1200-1500 r / min, the distance between the brushing roller and the sliver is 0.3-0.8 mm, and the brushing temperature is 50-60℃.

8. The method for preparing acrylic fiber tops according to claim 1, characterized in that, The concentration of anti-pilling agent in S5 is 8-12 g / L, the padding temperature is 35-45℃, the roll residue is 60-70%, and it is pre-dried at 80-90℃ for 3-5 min after padding.

9. The method for preparing acrylic fiber tops according to claim 1, characterized in that, The S6 uses heat setting for the shaping process, with the temperature controlled at 120-140℃, the setting time at 3-5 minutes, and the setting pressure at 0.2-0.3MPa.

10. An acrylic fiber sliver, characterized in that, The acrylic fiber top is prepared by the preparation method described in any one of claims 1-9.

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