Super-soft instant-absorbing yarn spinning process and application thereof

Abstract

This application relates to the field of textile fabrics, and more particularly to a super-soft, instant-absorption yarn spinning process and its application. The super-soft yarn spinning process includes the following steps: S1: cotton selection process; S2: cotton opening and cleaning process; S3: carding process; S4: combing process; S5: drawing process; S6: roving-spinning process; S7: winding process. The spinning process provided by this application can effectively overcome the difficulties of a sharp drop in dynamic strength, increased yarn breakage making continuous production difficult, and deterioration of quality indicators such as hairiness in low-twist yarns, ensuring the efficiency of normal spinning; at the same time, without increasing the investment in major equipment modifications, low-twist yarn can be successfully spun, which can effectively improve the surface smoothness, breathability, mechanical strength, elasticity, and durability of the yarn and fabric while ensuring the softness and moisture absorption of the yarn and fabric, and has excellent market prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile fabric, in particular to a super-soft instant-absorbing yarn spinning process and application thereof. BACKGROUND

[0002] In recent years, Chinese consumers' demand for clothes is no longer only focused on color, style and fashion, but also pays more attention to the softness, flexibility and moisture absorption of the fabric, which makes some manufacturers start to develop and research soft fabric in advance. In addition to the common softness agent treatment of the fabric, new requirements are also put forward in the process of fabric spinning, and the super-soft yarn spinning form is developed for this purpose.

[0003] Super-soft yarn spinning is a kind of false twist spinning, the yarn body is fluffy, the fibers are loose, and the fabric is soft. In order to achieve "softness", in addition to the softener treatment of the fabric, the industry also puts forward new schemes for the twist of the yarn. By using yarn with as low twist as possible to get fabric with good "softness". Generally, the twist factor of cotton yarn for knitting is 280-360, and the twist factor of cotton yarn for weaving is 290-430, while when the twist factor of cotton yarn is lower than 280, it belongs to special low twist yarn. But under the existing spinning process conditions, in the spinning section of the spinning process, the dynamic strength of the low twist yarn decreases sharply, which leads to the dynamic tension of the yarn in the spinning section being greater than its dynamic strength, and further causes the yarn to break, making it difficult to continue production. Even if the yarn is produced out, it cannot maintain the softness and moisture absorption of the yarn. In addition, when the twist of the yarn is reduced, the quality indicators such as yarn strength and hairiness will deteriorate. Therefore, how to ensure that the yarn has excellent softness and moisture absorption while avoiding the above problems that hinder continuous production, and effectively improve the surface smoothness, air permeability, mechanical strength, elasticity and other properties of the yarn fabric, has become the focus of research for those skilled in the art.

[0004] The present application provides a super-soft instant-absorbing yarn spinning process to solve the above problems. The spinning process provided by the present application can effectively overcome the difficulties of sharp decrease of dynamic strength of low twist yarn, increase of yarn breakage and deterioration of quality indicators such as hairiness, ensuring the efficiency of normal spinning; at the same time, without increasing the investment in large-scale equipment transformation, low twist yarn can be successfully spun, which can ensure the softness, moisture absorption of the spun yarn and fabric, and effectively improve the surface smoothness, air permeability, mechanical strength, elasticity and durability, etc., having very excellent market prospect. SUMMARY

[0005] To solve the above problems, the first aspect of the application provides a super-soft yarn spinning process, which comprises the following steps: S1: cotton selection process; S2: opening and picking process; S3: carding process; S4: combing process; S5: doubling process; S6: roving and spinning process; and S7: bobbin winding process.

[0006] As a preferred scheme, the cotton selection process comprises the following steps: screening cotton fibers and modified carbon fibers to form a mixed layer, adding an auxiliary agent after 3-4 times of laying, then continuing to lay 1-2 times, and carrying out a fluffing treatment to obtain mixed fibers.

[0007] As a preferred scheme, the auxiliary agent comprises a fluffing agent and an antistatic agent.

[0008] As a preferred scheme, the mass ratio of the fluffing agent to the antistatic agent is (3-4):(0.5-1.2).

[0009] As a preferred scheme, the mass ratio of the auxiliary agent to the mixed fibers is (4-8):(80-120).

[0010] As a preferred scheme, the mass ratio of the auxiliary agent to the mixed fibers is (5-8):(90-110).

[0011] As a preferred scheme, in the cotton selection process, the cotton fibers are preferably outer cotton fibers of a grade higher than double 30.

[0012] In the cotton selection process, fiber fineness, fiber length, and uniformity are considered first when selecting cotton. Compared with normal twist yarn, the low twist yarn of the application needs to control the fiber fineness to be finer during cotton blending, so as to increase the number of fibers in the cross section of the yarn and improve the cohesion between the fibers. After the twist of the yarn is reduced, the cohesion between the fibers will not decrease significantly, the yarn breakage during spinning will be reduced, and the strength of the finished yarn can be ensured.

[0013] As a preferred scheme, in the cotton selection process, the outer cotton fibers have a micronaire value of 3.5-5.0.

[0014] As a preferred scheme, in the cotton selection process, the outer cotton fibers have a micronaire value of 4.0-4.2.

[0015] As a preferred scheme, the preparation method of the modified carbon fiber comprises the following steps: S1: mixing carbon fiber with succinic anhydride and silane coupling agent, adding to an organic solvent, stirring and incubating at 60-80°C for 3-4h to obtain pretreated carbon fiber; S2: adding the pretreated carbon fiber to deionized water and uniformly ultrasonic dispersing for 2-4h, then adding ferric nitrate, 2-amino terephthalic acid and acetic acid, adding to a high-pressure sealed reaction kettle, high-temperature water reaction at 180-210°C for 10-14h; after the reaction is completed, the solid product is taken out; S3: the solid product is incubated in DMF solution at 40-60°C for 4-6h, after ultrasonic, the solid product is separated by suction filtration and washed with anhydrous ethanol, then the solid product is placed in an oven for vacuum drying, the drying temperature is 60-80°C, and after completion, it is obtained.

[0016] As a preferred scheme, the mass ratio of the carbon fiber, succinic anhydride and silane coupling agent is (3-4):(1-2):(0.2-0.6).

[0017] As a preferred scheme, the mass ratio of the carbon fiber, succinic anhydride and silane coupling agent is 3.6:1.4:0.5.

[0018] In this application, the addition of the above modified carbon fiber can effectively improve the mechanical properties and water absorption and moisture absorption of the yarn. This is because the modified carbon fiber after the above modification can form a coordination connection effect with the subsequently added structural particles through the carboxyl groups on the surface of the pretreated carbon fiber, the existence of this effect can promote the connection and fixing effect of the structural particles on the carbon fiber, and in the long fiber chain of the carbon fiber, it acts as a solid site with certain support strength and connection point, which can play an excellent connection and support effect when the mixed fiber is subjected to external force, thereby greatly improving the mechanical and mechanical properties of the yarn. On the other hand, the carboxyl groups on the surface of the pretreated carbon fiber can form a smooth hydration layer in a humid environment, the existence of the hydration layer gives the carbon fiber surface excellent superhydrophilicity, which can absorb water molecules in the first time of contact, and the absorbed water molecules can gradually penetrate and contact with the structural particles, at this time the structural particles have strong water absorption and preservation performance, which can greatly absorb water molecules in a humid environment, thereby making the yarn have very excellent water absorption and moisture absorption and sweat prevention function.

[0019] As a preferred scheme, the mass ratio of the pretreated carbon fiber, ferric nitrate, 2-amino terephthalic acid and acetic acid is (3-4):(0.1-0.5):(0.2-0.4):(1-2).

[0020] As a preferred solution, the mass ratio of the pre-treated carbon fiber, iron nitrate, 2-amino terephthalic acid and acetic acid is 3.5:0.4:0.2:1.4.

[0021] As a preferred solution, the diameter of the carbon fiber is 6-10 μm.

[0022] As a preferred solution, the diameter of the carbon fiber is 8-10 μm.

[0023] As a preferred solution, the length of the carbon fiber is 6-10 mm.

[0024] As a preferred solution, the length of the carbon fiber is 6-8 mm.

[0025] In the present application, the mechanical properties and softness of the yarn can be further improved by further limiting the size of the carbon fiber and the ratio of the carbon fiber to the preparation raw material of the structural particle. This is mainly because when the size of the carbon fiber is further limited, the active group sites of the carboxyl groups on the surface of the carbon fiber after the pretreatment process can be effectively dispersed. More dispersed group sites can promote the insertion of the structural particle into the carbon fiber. More inserted structural particles can directly form a good site effect inside the carbon fiber, reduce the action distance, and thus play a better mechanical connection and support role. At the same time, more dispersed structural particles can enhance the bending radius of the modified carbon fiber, and thus avoid the bending resistance caused by the strong structure of the structural particle during use, thereby effectively improving the softness.

[0026] As a preferred solution, the opening and cleaning process is that the mixed fiber is sequentially processed through an automatic grab cotton machine, a carding machine and a single beater lap machine.

[0027] As a preferred solution, the speed of the beater of the automatic grab cotton machine is 500-600 r / min.

[0028] As a preferred solution, the carding machine adopts a carding beater operation; the speed of the carding beater of the carding machine is 380-450 r / min.

[0029] As a preferred solution, the single beater lap machine adopts a carding beater operation; the speed of the carding beater of the single beater lap machine is 880-900 r / min, and the speed of the lap roller is 9-10 r / min.

[0030] As a preferred solution, the carding process is that the mixed fiber after the opening and cleaning process is processed through a carding machine.

[0031] As a preferred solution, the speed of the licker-in of the carding machine is 720-760 r / min.

[0032] As a preferred embodiment, the cylinder speed of the carding machine is 320-330 r / min, and the doffer speed is 23-25 ​​r / min.

[0033] As a preferred embodiment, the five-point spacing between the cylinder and the cover plate is 0.30-0.32mm, 0.28-0.3mm, 0.28-0.3mm, 0.28-0.29mm, and 0.30-0.32mm from the inlet to the outlet, respectively.

[0034] As a preferred embodiment, the combing process involves the combing machine employing a low cylinder speed process to comb the mixed fibers.

[0035] As a preferred embodiment, the cylinder speed of the combing machine is 120–160 r / min.

[0036] As a preferred embodiment, the drawing process uses a drawing machine to feed in 8 slivers. During the first drawing, the draft ratio in the rear zone is 1.3–1.45, the front roller spacing is 10–11 mm, and the rear roller spacing is 21–22 mm. During the second drawing, the draft ratio in the rear zone is 1.45–1.5, the front roller spacing is 11–12 mm, and the rear roller spacing is 18–20 mm. During the final drawing, the draft ratio in the rear zone is 1.2–1.4, the front roller spacing is 10–11 mm, and the rear roller spacing is 19–20 mm. The output speed of the three drawing processes is 280–320 m / min.

[0037] As a preferred embodiment, the roving-spinning process involves sequentially processing the mixed fibers on a roving frame and a spinning frame.

[0038] As a preferred embodiment, the roving weight of the roving frame is 6.5–7 g / 10m.

[0039] As a preferred embodiment, the back zone draft ratio of the roving frame is 1.12 to 1.2.

[0040] As a preferred embodiment, the roving frame has a Z-twist twist, a twist coefficient of 105–120, and a spindle speed of 1080–1150 r / min.

[0041] As a preferred embodiment, the yarn guiding stroke of the spinning machine is 8-10 mm.

[0042] As a preferred embodiment, the back zone draft ratio of the spinning machine is 1.18 to 1.24.

[0043] As a preferred embodiment, the center distance between the front rollers of the spinning machine is 35-38 mm, and the center distance between the rear rollers is 50-55 mm.

[0044] As a preferred embodiment, the spinning machine has a Z-twist direction, a twist coefficient of 245–250, and a spindle rotation speed of 12,000–13,000 r / min.

[0045] As a preferred embodiment, the winding process involves using a winding machine to wind the mixed fibers.

[0046] As a preferred embodiment, the winding speed of the winding machine is 800-850 m / min.

[0047] As a preferred embodiment, the weight of the winding machine's drum is 1800–1950 g.

[0048] As a preferred embodiment, the yarn clearing settings of the winding machine are: N: 230; S: 140% × 1.5; L: 35% × 22; T: -28% × 20.

[0049] This application, by limiting the above-mentioned spinning process parameters, can further meet the requirements of low-twist spinning processes, thereby overcoming the difficulties of a sharp drop in dynamic strength, increased yarn breakage making continuous production difficult, and deterioration of quality indicators such as hairiness in low-twist yarns. Furthermore, when spinning under the above parameters, the blending degree of cotton fibers and modified carbon fibers in the blended fibers can be effectively improved, thereby maximizing the advantages of blended fibers in mechanical support and water absorption and moisture absorption properties, and thus ensuring the mechanical properties, softness, and moisture absorption properties of the yarn.

[0050] The second aspect of this application provides an application of the above-mentioned ultra-soft instant absorbent yarn spinning process, including the application of the yarn produced by the ultra-soft instant absorbent yarn spinning process in the preparation process of underwear and infant fabrics.

[0051] The beneficial effects of this application are:

[0052] 1. The ultra-soft, instant-absorption yarn spinning process provided in this application can effectively overcome the difficulties of rapid decline in dynamic strength, increased yarn breakage making continuous production difficult, and deterioration of quality indicators such as hairiness in low-twist yarns, thus ensuring the efficiency of normal spinning. At the same time, without increasing the investment in major equipment modifications, low-twist yarns can be successfully spun. While ensuring the softness and water absorption of the spun yarn and fabric, it can also effectively improve the surface smoothness, breathability, mechanical strength, elasticity, and durability, and has excellent market prospects.

[0053] 2. The ultra-soft, instant-absorption yarn spinning process provided in this application effectively improves the mechanical properties and water absorption and hygroscopicity of the yarn by adding modified carbon fibers. The modified carbon fibers, through the polycarboxyl groups on the surface of the pretreated carbon fibers, form a coordination link with the structural particles prepared subsequently. This effect promotes the connection and fixation of the structural particles to the carbon fibers and acts as solid sites with certain supporting strength and connection points in the long carbon fiber chains. The presence of these sites provides excellent connection and support when the mixed fibers are subjected to external forces, thereby significantly improving the mechanical properties of the yarn. Furthermore, the polycarboxyl groups on the surface of the pretreated carbon fibers can form a smooth hydration layer in a humid environment. This hydration layer endows the carbon fiber surface with excellent superhydrophilicity, enabling it to absorb water molecules upon contact, thus greatly enhancing water absorption.

[0054] 3. The ultra-soft instant absorption yarn spinning process provided in this application can further improve the mechanical properties and softness of the yarn by further limiting the size of the carbon fiber and its ratio with the raw materials for preparing structural particles. When the size of the carbon fiber is further limited, the carboxyl active group sites on the surface of the carbon fiber can be effectively dispersed after the pretreatment process. The more dispersed group sites can promote the insertion of structural particles into the carbon fiber. More inserted structural particles can directly form good site effects inside the carbon fiber, reduce the moment of force, and thus play a better mechanical connection and support role.

[0055] 4. The ultra-soft instant absorption yarn spinning process provided in this application, by limiting the process parameters, can further meet the requirements of low-twist spinning process, thereby overcoming the difficulties of the sharp decline in dynamic strength of low-twist yarn, the increase in yarn breakage making continuous production difficult, and the deterioration of quality indicators such as hairiness. Furthermore, when spinning under the above parameters, it can effectively improve the blending degree of cotton fiber and modified carbon fiber in the blended fiber, thereby maximizing the advantages of blended fiber in mechanical support and water absorption and moisture absorption properties, and thus ensuring the mechanical properties, softness and moisture absorption properties of the yarn. Detailed Implementation

[0056] The following will further illustrate and demonstrate the technical solutions described above in this application through specific implementation schemes. Furthermore, the following embodiments are merely practical examples used to illustrate and explain the content of the technical solutions in the specification, and should not limit the scope of the claims to be protected by this application. All technical products based on the technical solutions described in this application should be covered within the scope of protection of this application.

[0057] In the following embodiments, unless otherwise specified, the raw materials are all commercially available products or can be prepared by methods known to those skilled in the art.

[0058] Example 1

[0059] Example 1 provides a super-soft yarn spinning process, the process steps of which include the following steps: S1: cotton selection process; S2: cotton opening and cleaning process; S3: carding process; S4: combing process; S5: drawing process; S6: roving-spinning process; S7: winding process.

[0060] Cotton selection process: Select cotton fibers and mix them with modified carbon fibers, lay them up three times, add auxiliary agents, lay them up two more times, and then perform a fuzzing treatment to obtain mixed fibers.

[0061] The auxiliary agents include wool conditioning agent and antistatic agent; the mass ratio of wool conditioning agent to antistatic agent is 3.5:1; the wool conditioning agent is wool conditioning oil FX-905; the antistatic agent is antistatic agent DK-103.

[0062] The mass ratio of auxiliary agent to mixed fiber is 8:110.

[0063] The cotton fiber is a grade of 30 or higher, selected from American Pima cotton. The micronaire value of the outer cotton fiber is 4.1, and the fiber length is 30mm.

[0064] The preparation method of modified carbon fiber includes the following steps, by mass: S1: Mix 3.6 parts of carbon fiber with 1.4 parts of succinic anhydride and 0.5 parts of 3-aminopropyltriethoxysilane, add to 60 parts of DMF, heat to 70℃ and stir for 4 hours to obtain pretreated carbon fiber; S2: Add 3.5 parts of pretreated carbon fiber to 200 parts of deionized water and ultrasonically disperse for 3 hours to achieve uniformity, then add 0.4 parts of ferric nitrate, 0.2 parts of 2-aminoterephthalic acid and 1.4 parts of acetic acid, add to a high-pressure sealed reactor, and react at 200℃ for 12 hours; after the reaction is completed, take out the solid product; S3: Sonicate the solid product in 4 times its volume of DMF solution at 60℃ for 5 hours, filter after ultrasonication, wash the solid product with anhydrous ethanol, and then place the solid product in an oven for vacuum drying at 65℃ to obtain the final product.

[0065] The carbon fiber is polyacrylonitrile-based carbon fiber sold by Lianyungang Ruichuang New Material Technology Co., Ltd.; the diameter of the carbon fiber is 8.5μm; the length of the carbon fiber is 8mm.

[0066] Opening and cleaning process: The mixed fibers are processed sequentially through an automatic cotton grabber, a carding opener, and a single-hand lap forming machine.

[0067] The automatic cotton grabber has a beater speed of 550 r / min; the carding opener uses a carding beater with a beater speed of 420 r / min; the single beater lap machine uses a carding beater with a beater speed of 880 r / min and a lap roller speed of 9.5 r / min.

[0068] Carding process: The mixed fibers after the opening and cleaning process are processed by a carding machine.

[0069] The carding machine has a licker-in speed of 740 r / min; a cylinder speed of 325 r / min and a doffer speed of 24 r / min; and five-point spacing between the cylinder and the flatplate from the inlet to the outlet of 0.32 mm, 0.28 mm, 0.28 mm, 0.28 mm and 0.30 mm respectively.

[0070] Combing process: The combing machine uses a low cylinder speed process to comb the mixed fibers.

[0071] The cylinder speed of the combing machine is 140 r / min.

[0072] In the drawing process, a drawing machine is used to feed 8 strips. During the first drawing, the draft ratio in the rear zone is 1.38, the front roller spacing is 10mm, and the rear roller spacing is 21mm. During the second drawing, the draft ratio in the rear zone is 1.48, the front roller spacing is 11mm, and the rear roller spacing is 20mm. During the final drawing, the draft ratio in the rear zone is 1.25, the front roller spacing is 11mm, and the rear roller spacing is 20mm. The output speed of the three drawing processes is 310m / min.

[0073] Roving-spinning process: The mixed fibers are processed sequentially on the roving frame and the spinning frame.

[0074] The roving weight of the roving frame is 7g / 10m; the back zone draft ratio of the roving frame is 1.2; the twist direction of the roving frame is Z twist; the twist coefficient is 115; and the spindle speed is 1120r / min.

[0075] The yarn guide stroke of the spinning frame is 9mm; the back zone draft ratio of the spinning frame is 1.22; the center distance between the front rollers of the spinning frame is 36mm, and the center distance between the back rollers is 52mm.

[0076] The spinning frame has a Z-twist direction, a twist coefficient of 250, and a spindle speed of 12800 r / min.

[0077] Winding process: The mixed fibers are wound using a winding machine.

[0078] The winding speed of the winding machine is 830 m / min; the weight of the winding machine is 1880 g; the yarn clearing settings of the winding machine are: N: 230; S: 140% × 1.5; L: 35% × 22; T: -28% × 20.

[0079] Example 2

[0080] Example 2 provides a super-soft yarn spinning process, the process steps of which include the following steps: S1: cotton selection process; S2: cotton opening and cleaning process; S3: carding process; S4: combing process; S5: drawing process; S6: roving-spinning process; S7: winding process.

[0081] Cotton selection process: Select cotton fibers and mix them with modified carbon fibers, lay them up three times, add auxiliary agents, lay them up two more times, and then perform a fuzzing treatment to obtain mixed fibers.

[0082] The auxiliary agents include wool conditioning agent and antistatic agent; the mass ratio of wool conditioning agent to antistatic agent is 3:1; the wool conditioning agent is wool conditioning oil FX-905; the antistatic agent is antistatic agent DK-103.

[0083] The mass ratio of auxiliary agent to mixed fiber is 6:100.

[0084] The cotton fiber is a grade of 30 or higher, with a micronaire value of 4.5 and a fiber length of 32mm.

[0085] The preparation method of modified carbon fiber includes the following steps, by mass: S1: Mix 3.6 parts of carbon fiber with 1.4 parts of succinic anhydride and 0.5 parts of 3-aminopropyltriethoxysilane, add to 60 parts of DMF, heat to 70℃ and stir for 4 hours to obtain pretreated carbon fiber; S2: Add 3.5 parts of pretreated carbon fiber to 200 parts of deionized water and ultrasonically disperse for 3 hours to achieve uniformity, then add 0.4 parts of ferric nitrate, 0.2 parts of 2-aminoterephthalic acid and 1.4 parts of acetic acid, add to a high-pressure sealed reactor, and react at 200℃ for 12 hours; after the reaction is completed, take out the solid product; S3: Sonicate the solid product in 4 times its volume of DMF solution at 60℃ for 5 hours, filter after ultrasonication, wash the solid product with anhydrous ethanol, and then place the solid product in an oven for vacuum drying at 65℃ to obtain the final product.

[0086] The carbon fiber is polyacrylonitrile-based carbon fiber sold by Lianyungang Ruichuang New Material Technology Co., Ltd.; the diameter of the carbon fiber is 8μm; the length of the carbon fiber is 6.5mm.

[0087] Opening and cleaning process: The mixed fibers are processed sequentially through an automatic cotton grabber, a carding opener, and a single-hand lap forming machine.

[0088] The automatic cotton grabber has a beater speed of 550 r / min; the carding opener uses a carding beater with a beater speed of 420 r / min; the single beater lap machine uses a carding beater with a beater speed of 880 r / min and a lap roller speed of 9.5 r / min.

[0089] Carding process: The mixed fibers after the opening and cleaning process are processed by a carding machine.

[0090] The carding machine has a licker-in speed of 740 r / min; a cylinder speed of 325 r / min and a doffer speed of 24 r / min; and five-point spacing between the cylinder and the flatplate from the inlet to the outlet of 0.32 mm, 0.28 mm, 0.28 mm, 0.28 mm and 0.30 mm respectively.

[0091] Combing process: The combing machine uses a low cylinder speed process to comb the mixed fibers.

[0092] The cylinder speed of the combing machine is 140 r / min.

[0093] In the drawing process, a drawing machine is used to feed 8 strips. During the first drawing, the draft ratio in the rear zone is 1.38, the front roller spacing is 10mm, and the rear roller spacing is 21mm. During the second drawing, the draft ratio in the rear zone is 1.48, the front roller spacing is 11mm, and the rear roller spacing is 20mm. During the final drawing, the draft ratio in the rear zone is 1.25, the front roller spacing is 11mm, and the rear roller spacing is 20mm. The output speed of the three drawing processes is 310m / min.

[0094] Roving-spinning process: The mixed fibers are processed sequentially on the roving frame and the spinning frame.

[0095] The roving weight of the roving frame is 7g / 10m; the back zone draft ratio of the roving frame is 1.2; the twist direction of the roving frame is Z twist; the twist coefficient is 115; and the spindle speed is 1120r / min.

[0096] The yarn guide stroke of the spinning frame is 9mm; the back zone draft ratio of the spinning frame is 1.22; the center distance between the front rollers of the spinning frame is 36mm, and the center distance between the back rollers is 52mm.

[0097] The spinning frame has a Z-twist direction, a twist coefficient of 250, and a spindle speed of 12800 r / min.

[0098] Winding process: The mixed fibers are wound using a winding machine.

[0099] The winding speed of the winding machine is 830 m / min; the weight of the winding machine is 1880 g; the yarn clearing settings of the winding machine are: N: 230; S: 140% × 1.5; L: 35% × 22; T: -28% × 20.

[0100] Comparative Example 1

[0101] The specific implementation method of this comparative example is basically the same as that of Example 1, except that the modified carbon fiber is replaced with carbon fiber with a diameter of 5μm and a length of 5.5mm, which is the corresponding grade of polyacrylonitrile-based carbon fiber purchased from Lianyungang Ruichuang New Material Technology Co., Ltd.

[0102] Comparative Example 2

[0103] The specific implementation method of this comparative example is basically the same as that of Example 1, except that the preparation method of modified carbon fiber includes the following steps, in parts by mass: S1: 3.6 parts of carbon fiber, 1.4 parts of succinic anhydride and 0.5 parts of 3-aminopropyltriethoxysilane are mixed and added to 60 parts of DMF. The mixture is heated to 70°C and stirred for 4 hours to obtain pretreated carbon fiber; S2: 3.5 parts of pretreated carbon fiber are added to 200 parts of deionized water and ultrasonically dispersed for 3 hours. Then, 0.1 parts of ferric nitrate, 0.05 parts of 2-aminoterephthalic acid and 0.5 parts of acetic acid are added and added to a high-pressure sealed reactor. The mixture is reacted with water at 200°C for 12 hours. After the reaction is completed, the solid product is taken out; S3: The solid product is ultrasonically heated at 60°C for 5 hours in 4 times the volume of DMF solution. After ultrasonication, the solid product is separated by filtration and washed with anhydrous ethanol. The solid product is then placed in an oven for vacuum drying at 65°C. The product is then obtained.

[0104] Comparative Example 3

[0105] The specific implementation method of this comparative example is basically the same as that of Example 1, except that the preparation method of modified carbon fiber includes the following steps, in parts by mass: S1: 3.5 parts of carbon fiber are added to 200 parts of deionized water and ultrasonically dispersed for 3 hours. Then, 0.4 parts of ferric nitrate, 0.2 parts of 2-aminoterephthalic acid and 1.4 parts of acetic acid are added and placed in a high-pressure sealed reactor. The mixture is reacted with water at 200°C for 12 hours. After the reaction is completed, the solid product is taken out. S2: The solid product is ultrasonically heated at 60°C for 5 hours in 4 times the volume of DMF solution. After ultrasonication, the solid product is separated by filtration and washed with anhydrous ethanol. Then, the solid product is placed in an oven for vacuum drying at 65°C. After the drying is completed, the product is obtained.

[0106] Comparative Example 4

[0107] The specific implementation method of this comparative example is basically the same as that of Example 1, except that: in the preparation method of modified carbon fiber, the diameter of the carbon fiber is 4μm and the length is 5mm, and the carbon fiber is purchased from polyacrylonitrile-based carbon fiber sold by Lianyungang Ruichuang New Material Technology Co., Ltd.

[0108] Comparative Example 5

[0109] The specific implementation method of this comparative example is basically the same as that of Example 1, except that the micronaire value of the outer cotton fiber is 3.2, the fiber length is 28mm, and it is selected from Giza cotton from Egypt.

[0110] Comparative Example 6

[0111] The specific implementation method of this comparative example is basically the same as that of Example 1, except that: the roving weight of the roving frame is 6g / 10m; the back zone draft ratio of the roving frame is 1.5; the twist direction of the roving frame is Z twist; the twist coefficient is 150; and the spindle speed is 980r / min.

[0112] Comparative Example 7

[0113] The specific implementation method of this comparative example is basically the same as that of Example 1, except that: the yarn guide stroke of the spinning machine is 12mm; the back zone draft ratio of the spinning machine is 1.05; the center distance between the front rollers of the spinning machine is 45mm and the center distance between the back rollers is 68mm; the twist direction of the spinning machine is Z twist; the twist coefficient is 180; and the spindle speed is 9800r / min.

[0114] Comparative Example 8

[0115] The specific implementation method of this comparative example is basically the same as that of Example 1, except that: in the drawing process, a drawing machine is used to feed 8 strips. The draft ratio in the back zone of the first drawing is 1.18, the front roller spacing is 13mm, and the back roller spacing is 24mm; the draft ratio in the back zone of the second drawing is 1.28, the front roller spacing is 10mm, and the back roller spacing is 18mm; the draft ratio in the back zone of the last drawing is 1.45, the front roller spacing is 8mm, and the back roller spacing is 16mm; the output speed of the three blending processes is 210m / min.

[0116] Performance Evaluation

[0117] Saturated hygroscopicity: The yarns prepared in the examples and comparative examples were subjected to saturated hygroscopicity tests. The yarns were placed in a hot air dryer and dried at 110°C for 24 hours. The weight before the test was measured. Then, the yarns were stored at 20°C and 75% humidity for 24 hours. The weight after the 24-hour test was measured. The saturated hygroscopicity was calculated as follows: Saturated hygroscopicity % = (weight after test - weight before test) / weight before test × 100%. The average value of 10 measurements was recorded in Table 1.

[0118] Mechanical strength: The yarns prepared in the examples and comparative examples were subjected to mechanical strength tests. The tests were conducted using an electronic single yarn strength tester. The test sample length was 500 mm. Before the test, the yarns were placed under standard atmospheric conditions for 24 hours. The average value of 10 measurements was recorded in Table 1.

[0119] Mechanical strength retention rate: Take samples of the yarns prepared in the examples and comparative examples, with a sample length of 5cm, and test the breaking strength of the blended yarns after 0 washes and 60 washes using a breaking strength tester, and calculate the strength retention rate. Strength retention rate % = (breaking strength after 60 washes / breaking strength after 0 washes) × 100%. The average value of the measured values ​​is recorded in Table 1.

[0120] Table 1

[0121]

[0122]

[0123] From the embodiments and comparative examples of this application, as well as the data results in Table 1, it can be seen that Embodiments 1 and 2, which adopt the necessary technical solutions of this application, are significantly stronger than Comparative Examples 1 to 8 in terms of moisture absorption, mechanical properties, and softness. This is mainly because Embodiments 1 and 2 use the correct combination of modified carbon fiber and spinning process, which can ensure its softness while strengthening the mechanical support / connection and moisture absorption of the modified carbon fiber in the blended yarn system. It also greatly reduces the increase in yarn breakage and the sharp drop in dynamic strength of low-twist yarn in the spinning process. Thus, in multiple spinning experiments, it can maintain excellent yarn quality and process smoothness, and has a very good market prospect.

Claims

1. A spinning process for ultra-soft, instant-absorption yarn, characterized in that: The process steps include the following: S1: cotton selection process; S2: cotton opening and cleaning process; S3: carding process; S4: combing process; S5: drawing process; S6: roving-spinning process; S7: winding process; The cotton selection process involves screening cotton fibers and mixing them with modified carbon fibers, laying them in layers, adding auxiliary agents after 3-4 passes, and then laying them in layers 1-2 more times. After a buffing process, the mixed fibers are obtained. The auxiliary agents include a wool-softening agent and an antistatic agent; the mass ratio of the wool-softening agent to the antistatic agent is (3~4):(0.5~1.2). The mass ratio of the auxiliary agent to the mixed fiber is (4~8):(80~120); In the cotton selection process, the cotton fibers are selected from foreign cotton fibers with a double grade of 30 or higher. In the cotton selection process, the micronaire value of the outer cotton fibers is 3.5 to 5.0; The preparation method of the modified carbon fiber includes the following steps: S1: Mix carbon fiber with succinic anhydride and silane coupling agent, add to an organic solvent, heat to 60~80℃ and stir and keep warm for 3~4h to obtain pretreated carbon fiber; S2: Add the pretreated carbon fiber to deionized water and ultrasonically disperse for 2~4h until uniform, then add ferric nitrate, 2-aminoterephthalic acid and acetic acid, add to a high-pressure sealed reactor, and react with water at 180~210℃ for 10~14h; after the reaction is completed, take out the solid product; S3: Keep the solid product in DMF solution at 40~60℃ and sonicate for 4~6h, after sonication, filter and separate, wash the solid product with anhydrous ethanol, then place the solid product in an oven for vacuum drying at 60~80℃, and the product is obtained after the drying is completed; The mass ratio of the carbon fiber, succinic anhydride, and silane coupling agent is (3~4):(1~2):(0.2~0.6). The mass ratio of the pretreated carbon fiber, ferric nitrate, 2-aminoterephthalic acid, and acetic acid is (3~4):(0.1~0.5):(0.2~0.4):(1~2). The carbon fiber has a diameter of 6~10μm and a length of 6~10mm.

2. The ultra-soft, instant-absorption yarn spinning process according to claim 1, characterized in that: The opening and cleaning process involves passing the mixed fibers sequentially through an automatic cotton grabber, a carding opener, and a single-hand lap forming machine; the speed of the automatic cotton grabber is 500~600 r / min.

3. The ultra-soft, instant-absorption yarn spinning process according to claim 2, characterized in that: The carding opener is operated by a carding beater; the carding beater speed of the carding opener is 380~450 r / min; the single beater lap forming machine is operated by a carding beater; the carding beater speed of the single beater lap forming machine is 880~900 r / min, and the lap roller speed is 9~10 r / min.

4. The ultra-soft, instant-absorption yarn spinning process according to claim 3, characterized in that: The carding process involves processing the mixed fibers after the opening and cleaning process through a carding machine; the carding machine has a licker-in speed of 720~760 r / min; and the five-point spacing between the cylinder and the flat top is 0.30~0.32mm, 0.28~0.3mm, 0.28~0.3mm, 0.28~0.29mm, and 0.30~0.32mm from the inlet to the outlet.

5. The ultra-soft, instant-absorption yarn spinning process according to claim 4, characterized in that: In the drawing process, a drawing machine is used to feed in 8 strips. During the first drawing, the draft ratio in the back zone is 1.3~1.45, the front roller spacing is 10~11 mm, and the back roller spacing is 21~22 mm. During the second drawing, the draft ratio in the back zone is 1.45~1.5, the front roller spacing is 11~12 mm, and the back roller spacing is 18~20 mm. During the final drawing, the draft ratio in the back zone is 1.2~1.4, the front roller spacing is 10~11 mm, and the back roller spacing is 19~20 mm. The output speed of the three drawing processes is 280~320 m / min.

6. The ultra-soft, instant-absorption yarn spinning process according to claim 5, characterized in that: The roving-spinning process involves sequentially processing the mixed fibers on a roving frame and a spinning frame. The roving frame has a Z-twist twist, a twist coefficient of 105-120, and a spindle speed of 1080-1150 r / min. The spinning frame also has a Z-twist twist, a twist coefficient of 245-250, and a spindle speed of 12000-13000 r / min.

7. An application of the ultra-soft, instant-absorption yarn spinning process according to any one of claims 1 to 6, characterized in that: This includes the application of yarn produced by this ultra-soft, instant-absorption yarn spinning process in the preparation of underwear and infant fabrics.

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