Spinning process and yarn structure of low-torque high-elastic cotton soft yarn

Abstract

The invention relates to the technical field of yarn spinning, in particular to a low-torque high-elastic soft cotton yarn spinning process and a yarn structure, and the low-torque high-elastic soft cotton yarn spinning process comprises the steps that guar gum and diphenolic acid are used for preparing antibacterial cotton fibers; performing softening modification on fibrilia, and mixing with spandex fiber to obtain composite elastic fiber; respectively carding the cotton fibers, the antibacterial cotton fibers and the composite elastic fibers by using a carding machine to obtain cotton slivers, antibacterial cotton slivers and composite elastic slivers; drawing the cotton slivers, the antibacterial cotton slivers and the composite elastic slivers by using a drawing frame to obtain mixed slivers; processing the mixed slivers through a roving frame and a spinning frame in sequence to obtain the high-elasticity cotton soft yarn. According to the invention, cotton fibers are used as main fibers, and a part of antibacterial cotton fibers are added into the main fibers, so that the antibacterial performance of the prepared yarn is improved; by adding the composite elastic fibers, the elasticity and strength of the prepared yarn are improved, and therefore the problems that traditional cotton yarn is insufficient in elasticity and poor in strength are solved.

Description

Technical Field

[0001] This invention relates to the field of yarn textile technology, specifically to a spinning process and yarn structure for low-torque, high-elasticity cotton soft yarn. Background Technology

[0002] Hemp fiber belongs to the cellulose fiber family and possesses properties such as moisture absorption and wicking, breathability, antistatic properties, and antibacterial properties. Yarns and fabrics made from hemp fibers also exhibit excellent moisture absorption and breathability. Furthermore, the high strength and good abrasion resistance of hemp fibers ensure good durability in use and under load. Blended yarn is a yarn obtained by blending two or more different types of fibers through a spinning process. This type of yarn can simultaneously possess the advantages of different fibers. By blending hemp fibers into cotton fibers, the strength of the resulting yarn can be improved, deformation and wrinkling can be reduced, and the natural softness and non-irritating properties of cotton fibers can be maintained. However, cotton and hemp fiber blended yarns still suffer from insufficient elasticity. Based on this, a spinning process and yarn structure for low-torque, high-elasticity cotton-soft yarn are proposed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a spinning process and yarn structure for low-torque, high-elasticity cotton yarn. By adding antibacterial cotton fibers and composite elastic fibers, the antibacterial properties, elasticity, and strength of the produced yarn are improved, thereby solving the problems of insufficient elasticity and strength deviation in traditional cotton yarn.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a spinning process for low-torque, high-elasticity cotton yarn, comprising the following steps: (1) Guar gum aqueous solution is sprayed onto the surface of cotton fibers by atomization, dried and then immersed in bisphenol acid solution. After the immersion is completed, the fibers are taken out and washed and dried to obtain antibacterial cotton fibers. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers, antibacterial cotton slivers and composite elastic slivers; (4) Using a drawing frame, cotton slivers, antibacterial cotton slivers and composite elastic strips are drawn together to obtain a mixed strip; (5) The blended yarn is processed by a roving machine and a spinning machine in sequence to produce high elastic cotton yarn.

[0005] Preferably, in step (1), the mass fraction of the guar gum aqueous solution is 2-4%; the bisphenol acid solution is prepared by dissolving bisphenol acid in ethanol, and its mass fraction is 2-3%.

[0006] Preferably, in step (2), the preparation method of the composite elastic fiber is as follows: S1, immerse the hemp fiber in the softening solution, and after the softening treatment is completed, take it out and wash and dry it to obtain softened hemp fiber; S2, mix the softened hemp fiber and spandex fiber to obtain composite elastic fiber.

[0007] Preferably, in step S1, the softening solution contains, by mass percentage: 8-10% sodium hydroxide, 1-3% urea, 1-2% thiourea, and the remainder is deionized water.

[0008] Preferably, in step S1, the temperature of the softening treatment is 1-3℃, and the softening treatment time is 15-20min.

[0009] Preferably, in step S2, the mass ratio of spandex fiber to softened hemp fiber is 1:(4-5).

[0010] Preferably, in step (3), the amount of tampons, antibacterial tampons and composite elastic strips is 20.5g / 5m.

[0011] Preferably, in step (4), the total number of slivers is 8, including 5 cotton slivers, 1 antibacterial cotton sliver, and 2 composite elastic strips; during the sliver drawing process, the front zone draft ratio is controlled to be 5.85, the middle zone draft ratio is 1.02, the rear zone draft ratio is 1.22, and the sliver output speed is 5.5 m / min.

[0012] Preferably, in step (5), in the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5; in the spinning process, the yarn count is 20 English count and the twist is 610 twists / m.

[0013] The present invention also provides a yarn structure, which is composed of cotton fibers, antibacterial cotton fibers and composite elastic fibers.

[0014] This invention provides a spinning process and yarn structure for low-torque, high-elasticity cotton soft yarn, which has the following advantages compared with the prior art: This invention uses cotton fiber as the main fiber. By adding some antibacterial cotton fiber, the antibacterial properties of the yarn are improved. By adding composite elastic fiber, the elasticity and strength of the yarn are improved, thus solving the problems of insufficient elasticity and strength deviation of traditional cotton yarn.

[0015] This invention uses bisphenol A to modify cotton fibers for antibacterial properties and guar gum as an intermediate to improve the fixation effect of bisphenol A and cotton fiber matrix, so that the yarn has good antibacterial stability. Specifically, the carboxyl group of guar gum forms an ester bond with the hydroxyl group of cotton fiber, and the bisphenol A molecule is fixed through the ester group to achieve a stable connection between the two. Even after multiple washes, the yarn still has good antibacterial properties.

[0016] This invention improves the softening properties of hemp fibers and, in conjunction with a small amount of spandex fibers, ensures that the resulting yarn has good elasticity and excellent strength. Specifically, sodium hydroxide breaks the hydrogen bonds within and between cellulose molecules, causing the cellulose to gradually dissolve. Urea and thiourea hydrates encapsulate the cellulose chains, preventing them from re-aggregating, thereby improving the softness and elasticity of the hemp fibers. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 These are scanned images of cotton fibers and antibacterial cotton fibers in Example 3 of the present invention; Figure 2 This invention relates to an electronic single yarn strength tester for testing high-elasticity cotton yarn. Detailed Implementation

[0018] The following embodiments are provided to illustrate the implementation of this application in detail, so that the process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Example 1: The preparation method of composite elastic fiber is as follows: S1. Immerse the hemp fiber in the softening solution, treat it at 1℃ for 15 minutes, take it out and wash and dry it to obtain softened hemp fiber; The softening solution contains, by mass percentage: 10% sodium hydroxide, 1% urea, 2% thiourea, and the remainder is deionized water.

[0020] S2. Softened hemp fiber and spandex fiber are mixed at a mass ratio of 5:1 to obtain composite elastic fiber.

[0021] Example 2: The preparation method of composite elastic fiber is as follows: S1. Immerse the hemp fiber in the softening solution, treat it at 3℃ for 20 minutes, take it out and wash and dry it to obtain softened hemp fiber; The softening solution contains, by mass percentage: 8% sodium hydroxide, 3% urea, 1% thiourea, and the remainder is deionized water.

[0022] S2. Softened hemp fiber and spandex fiber are mixed at a mass ratio of 4:1 to obtain composite elastic fiber.

[0023] Example 3, a spinning process for low-torque, high-elasticity cotton yarn, characterized by the following steps: (1) Spray 2wt% guar gum aqueous solution onto the surface of cotton fiber, dry it and then soak it in 3wt% bisphenol acid ethanol solution. After soaking, take it out and wash and dry it to obtain antibacterial cotton fiber. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers (20.5g / 5m), antibacterial cotton slivers (20.5g / 5m basis weight) and composite elastic slivers (20.5g / 5m basis weight). (4) Use a drawing frame to draw cotton slivers, antibacterial cotton slivers and composite elastic strips to obtain mixed strips; the total number of drawn strips is 8, of which 5 are cotton slivers, 1 is antibacterial cotton sliver and 2 are composite elastic strips; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (5) The blended sliver is processed by a roving frame and a spinning frame (with a low torque device). In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0024] The composite elastic strip in this embodiment is prepared using the method described in Example 1.

[0025] Combination Figure 1 It can be seen that, Figure 1 (a) There are many grooves on the surface of cotton fibers. Figure 1 (b) The grooves on the surface of the antibacterial cotton fibers were filled.

[0026] Example 4: A spinning process for low-torque, high-elasticity cotton yarn, characterized by the following steps: (1) Spray 4wt% guar gum aqueous solution onto the surface of cotton fiber, dry it and then soak it in 2wt% bisphenol acid ethanol solution. After soaking, take it out and wash and dry it to obtain antibacterial cotton fiber. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers (20.5g / 5m), antibacterial cotton slivers (20.5g / 5m basis weight) and composite elastic slivers (20.5g / 5m basis weight). (4) Use a drawing frame to draw cotton slivers, antibacterial cotton slivers and composite elastic strips to obtain mixed strips; the total number of drawn strips is 8, of which 5 are cotton slivers, 1 is antibacterial cotton sliver and 2 are composite elastic strips; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (5) The blended sliver is processed by a roving frame and a spinning frame (with a low torque device). In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0027] The composite elastic strip in this embodiment is prepared using the method described in Example 2.

[0028] Example 5: A spinning process for low-torque, high-elasticity cotton yarn, characterized by the following steps: (1) Spray 3wt% guar gum aqueous solution onto the surface of cotton fiber, dry it and then soak it in 2wt% bisphenol acid ethanol solution. After soaking, take it out and wash and dry it to obtain antibacterial cotton fiber. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers (20.5g / 5m), antibacterial cotton slivers (20.5g / 5m basis weight) and composite elastic slivers (20.5g / 5m basis weight). (4) Use a drawing frame to draw cotton slivers, antibacterial cotton slivers and composite elastic strips to obtain mixed strips; the total number of drawn strips is 8, of which 5 are cotton slivers, 1 is antibacterial cotton sliver and 2 are composite elastic strips; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (5) The blended sliver is processed by a roving frame and a spinning frame (with a low torque device). In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0029] The composite elastic strip in this embodiment is prepared using the method described in Example 1.

[0030] Comparative Example 1: A spinning process for low-torque, high-elasticity cotton yarn, characterized by comprising the following steps: (1) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (2) The cotton fibers and composite elastic fibers were combed using a carding machine to obtain cotton slivers (weight 20.5g / 5m) and composite elastic slivers (weight 20.5g / 5m). (3) The cotton sliver and the composite elastic strip are drawn together using a drawing frame to obtain a mixed sliver; the total number of slivers drawn is 8, of which 6 are cotton slivers and 2 are composite elastic strips; during the drawing process, the draft ratio of the front zone is controlled to be 5.85, the draft ratio of the middle zone is 1.02, the draft ratio of the back zone is 1.22, and the sliver exit speed is 5.5 m / min; (4) The blended yarn is processed by a roving frame and a spinning frame (with a low torque device) in sequence. In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0031] The composite elastic strip in this comparative example was prepared using the method described in Example 1.

[0032] Comparative Example 2: A spinning process for low-torque, high-elasticity cotton yarn, characterized by comprising the following steps: (1) The cotton fiber was immersed in a 3wt% bisphenol A ethanol solution. After the immersion was completed, it was taken out and washed and dried to obtain antibacterial cotton fiber. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers (20.5g / 5m), antibacterial cotton slivers (20.5g / 5m basis weight) and composite elastic slivers (20.5g / 5m basis weight). (4) Use a drawing frame to draw cotton slivers, antibacterial cotton slivers and composite elastic strips to obtain mixed strips; the total number of drawn strips is 8, of which 5 are cotton slivers, 1 is antibacterial cotton sliver and 2 are composite elastic strips; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (5) The blended sliver is processed by a roving frame and a spinning frame (with a low torque device). In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0033] The composite elastic strip in this comparative example was prepared using the method described in Example 1.

[0034] Comparative Example 3, a spinning process for low-torque, high-elasticity cotton yarn, characterized by comprising the following steps: (1) Spray 2wt% guar gum aqueous solution onto the surface of cotton fiber, dry it and then soak it in 3wt% bisphenol acid ethanol solution. After soaking, take it out and wash and dry it to obtain antibacterial cotton fiber. (2) Mix hemp fiber and spandex fiber at a mass ratio of 5:1 to obtain composite elastic fiber; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers (20.5g / 5m), antibacterial cotton slivers (20.5g / 5m basis weight) and composite elastic slivers (20.5g / 5m basis weight). (4) Use a drawing frame to draw cotton slivers, antibacterial cotton slivers and composite elastic strips to obtain mixed strips; the total number of drawn strips is 8, of which 5 are cotton slivers, 1 is antibacterial cotton sliver and 2 are composite elastic strips; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (5) The blended sliver is processed by a roving frame and a spinning frame (with a low torque device). In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0035] Comparative Example 4: A spinning process for low-torque, high-elasticity cotton yarn, characterized by the following steps: (1) Spray 2wt% guar gum aqueous solution onto the surface of cotton fiber, dry it and then soak it in 3wt% bisphenol acid ethanol solution. After soaking, take it out and wash and dry it to obtain antibacterial cotton fiber. (2) The cotton fibers and antibacterial cotton fibers were combed separately using a carding machine to obtain cotton slivers (20.5g / 5m) and antibacterial cotton slivers (quantity 20.5g / 5m). (3) Use a drawing frame to draw cotton slivers and antibacterial cotton slivers to obtain a mixed sliver; the total number of slivers drawn is 8, of which 7 are cotton slivers and 1 is antibacterial cotton sliver; during the drawing process, control the draft ratio of the front zone to be 5.85, the draft ratio of the middle zone to be 1.02, the draft ratio of the back zone to be 1.22, and the sliver output speed to be 5.5 m / min; (4) The blended yarn is processed by a roving frame and a spinning frame (with a low torque device) in sequence. In the roving process, the roving weight is 5.5 g / 10 m, the twist is 45 twists / m, and the draft ratio is 5.5. In the spinning process, the yarn count is 20 English count and the twist is 610 twists / m, to produce high elastic cotton soft yarn.

[0036] Quality Inspection 1. The high-elastic cotton yarns from Examples 3-5 and Comparative Example 2 were used as test samples. Antimicrobial properties were tested according to AATCC 100-2019. The specific test results are shown in the table below.

[0037] Table 1 Antibacterial properties

[0038] As can be seen from the table above, compared with Example 3, the high-elastic cotton yarn in Comparative Example 2 also showed excellent antibacterial rate before washing, but its antibacterial rate decreased significantly after washing.

[0039] 2. The high-elastic cotton yarns from Examples 3-5 and Comparative Example 3 were used as test samples. The elastic recovery rate was tested according to FZ / T50006-2013 standard; the breaking strength was tested according to GB / T 3916-2013 standard. Specific test results are shown in the table below.

[0040] Table 2 Elastic recovery rate and fracture strength

[0041] From the table above, we can see that: (1) Compared with Example 3, the high-elastic cotton yarn in Comparative Example 3 did not soften the hemp fiber. It can be found that the breaking strength of the yarn increased slightly, but its elastic recovery rate decreased significantly.

[0042] (2) Compared with Example 3, the high-elastic cotton yarn in Comparative Example 4 did not have composite elastic fibers added, resulting in poor elasticity and strength of the yarn.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spinning process for low-torque, high-elasticity cotton yarn, characterized in that, Includes the following steps: (1) Guar gum aqueous solution is sprayed onto the surface of cotton fiber by atomization, dried and then immersed in bisphenol acid solution. After the immersion is completed, it is taken out and washed and dried to obtain antibacterial cotton fiber. (2) Soften and modify hemp fibers and mix them with spandex fibers to obtain composite elastic fibers; (3) The cotton fibers, antibacterial cotton fibers and composite elastic fibers are combed using a carding machine to obtain cotton slivers, antibacterial cotton slivers and composite elastic slivers; (4) Using a drawing frame, cotton slivers, antibacterial cotton slivers and composite elastic strips are drawn together to obtain a mixed strip; (5) The blended yarn is processed by a roving machine and a spinning machine in sequence to produce high-elasticity cotton yarn.

2. The spinning process of low-torque high-elasticity cotton soft yarn according to claim 1, characterized in that, In step (1), the mass fraction of the guar gum aqueous solution is 2-4%; the bisphenol acid solution is prepared by dissolving bisphenol acid in ethanol, and its mass fraction is 2-3%.

3. The spinning process for low-torque, high-elasticity cotton yarn according to claim 1, characterized in that, In step (2), the method for preparing the composite elastic fiber is as follows: S1. Immerse the hemp fiber in the softening solution. After the softening process is completed, take it out and wash and dry it to obtain softened hemp fiber. S2. Softened hemp fiber and spandex fiber are mixed to obtain composite elastic fiber.

4. The spinning process for low-torque, high-elasticity cotton yarn according to claim 3, characterized in that, In step S1, the softening solution contains, by mass percentage: 8-10% sodium hydroxide, 1-3% urea, 1-2% thiourea, and the remainder is deionized water.

5. The spinning process for low-torque, high-elasticity cotton yarn according to claim 3, characterized in that, In step S1, the softening treatment temperature is 1-3℃ and the softening treatment time is 15-20min.

6. The spinning process for low-torque, high-elasticity cotton yarn according to claim 3, characterized in that, In step S2, the mass ratio of spandex fiber to softened hemp fiber is 1:(4-5).

7. The spinning process for low-torque, high-elasticity cotton yarn according to claim 1, characterized in that, In step (3), the tampons, antibacterial tampons and composite elastic strips are all quantitatively measured at 20.5g / 5m.

8. The spinning process for low-torque, high-elasticity cotton yarn according to claim 1, characterized in that, In step (4), the total number of slivers is 8, including 5 cotton slivers, 1 antibacterial cotton sliver, and 2 composite elastic strips. During the sliver drawing process, the draft ratio of the front zone is controlled to be 5.85, the draft ratio of the middle zone is 1.02, the draft ratio of the rear zone is 1.22, and the sliver output speed is 5.5 m / min.

9. The spinning process for low-torque, high-elasticity cotton yarn according to claim 1, characterized in that, In step (5), in the roving process, the roving weight is 5.5g / 10m, the twist is 45 twists / meter, and the draft ratio is 5.5; in the spinning process, the yarn count is 20 English count and the twist is 610 twists / meter.

10. The spinning process for low-torque, high-elasticity cotton yarn according to any one of claims 1-9, characterized in that, The yarn structure is composed of cotton fibers, antibacterial cotton fibers, and composite elastic fibers.

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