Blending process of hemp fiber and Sorona fiber

Abstract

This invention relates to a blending process for hemp fiber and sorona fiber, belonging to the technical field of blending and processing of natural fibers and bio-based elastic fibers. The blending process for hemp fiber and sorona fiber of this invention includes the following steps: raw material selection → pre-spinning process → post-spinning process → packaging. This invention solves the problems of poor spinnability, high breakage rate, and stiffness and wrinkling in pure wet-spun hemp through specific proportions and wet spinning processes, achieving high-count, stable, and high-quality production. This significantly improves spinnability, enhances yarn quality, and greatly improves hand feel and comfort, achieving high elasticity and comfort to meet user needs.

Description

Technical Field

[0001] This invention relates to a blending process, and more particularly to a blending process of hemp fiber and Sorona fiber, which belongs to the field of blending processing technology of natural fibers and bio-based elastic fibers. Background Technology

[0002] As a natural and green fiber, hemp fiber possesses excellent properties such as moisture absorption and breathability, antibacterial and mildew resistance, UV resistance, and high strength, making it a promising material for high-end apparel, home textiles, and functional textiles. However, hemp fiber itself has inherent defects such as high crystallinity, high rigidity, poor cohesion, rough surface, and poor spinnability, which affect the fabric's feel, making it prone to wrinkling and less skin-friendly.

[0003] Sorona fiber is a PTT elastic fiber based on bio-based raw materials. It features low modulus, high resilience, softness against the skin, and wrinkle resistance and shape retention, effectively compensating for the hand feel and elasticity deficiencies of rigid natural fibers. Meanwhile, to cater to the current trend of high-end sportswear brands shifting their fabric requirements from purely natural to "purely natural functionality," creating core products with "natural texture + physical properties" is the trend in the development of hemp fabrics.

[0004] A Chinese patent with publication date of October 12, 2018 and publication number CN108642652A discloses an invention patent entitled "A novel cotton fiber and synthetic fiber blending process". This patent describes a process where various fibers with conductive filaments are twisted into strands using a twisting device. These strands are then slid into a warp beam at a ratio of two conductive filaments per inch using a slitting warping machine, and woven on a loom. The finishing process involves inspection in the finishing workshop. The finishing process begins with boiling the fabric in warm water for 5-8 hours at a liquor ratio of 1:10-13, with the addition of a suitable amount of detergent. The resulting fabric is then soaked in a softener for 40-55 minutes, removed, and rinsed thoroughly with deionized water. After dehydration and drying, the washed textile fabric is dried in a dryer at a temperature of 90-110℃. The dried fabric is then stretched in a tenter frame. After stretching, the fabric is pre-shrinked in a pre-shrinking machine. The pre-shrinked fabric is then shaped and rolled up using a winding machine at a baking temperature of 60-75℃. Finally, it undergoes high-pressure ironing for shaping, followed by cooling, and the finished product is packaged and stored. Although the use of diethylene glycol, a softener, during the textile process extends the fabric's lifespan to some extent and enhances its softness, facilitating subsequent processes and improving textile efficiency, it cannot solve the inherent defects of hemp fiber, such as high crystallinity, high rigidity, poor cohesion, rough surface, and poor spinnability. It also cannot compensate for the hand feel and elasticity defects of rigid natural fibers, ultimately failing to improve the hand feel and comfort. Therefore, it still suffers from the aforementioned defects.

[0005] Therefore, it is particularly necessary to provide a blending process for hemp and Sorona fibers that solves the problems of poor spinnability, high breakage rate, and stiff and wrinkled fabrics caused by pure wet spinning of hemp through specific ratios and wet spinning processes, so as to achieve high-count, stable, and high-quality production and thus achieve high elasticity and comfort. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a blending process for hemp fiber and Sorona fiber that has a reasonable process design, significantly improved spinnability, excellent yarn quality, and greatly improved hand feel and comfort.

[0007] The technical solution adopted by the present invention to solve the above problems is: the blending process of hemp fiber and Sorona fiber, characterized by including the following steps: (S1) Raw material selection: Hemp combed into hemp fibers with a fineness of 550-750 Nm, a length of 50-80 cm, and a weight of 31 g / m; Sorona fibers with a specification of 1.5-3D, a length of 80-100 mm, and a weight of 20-22 g / m. (S2) The specific process of the pre-spinning step is as follows: (1) Strip formation: 18 strips are fed in, the draw ratio is 15±0.5 times, and the weight of the strip is 36±1g / m; (2) 0 and: 6 hemp strips are fed in, the draw ratio is 8±0.5 times, the weight of the strip is 25±0.5g / m, and the strip output speed is 24m / min; (3) 0-fold re-extraction: 6 0-fold hemp strips are fed in, with a draw ratio of 8±0.5 times, a strip weight of 19±0.5g / m, and a strip speed of 24m / min; (4) 1 pair: 8 0 pair hemp strips are fed in, the draw ratio is 8±0.5 times, the weight of the strip is 17±0.3g / m, and the strip output speed is 25m / min; (5) 2-ply: 6 1-ply hemp slivers (17g / m) + 2 Sorona fibers (20g / m) are fed in, with a draw ratio of 9.6±0.5 times, a sliver weight of 13±0.2 g / m, and a sliver speed of 26m / min; the amount of Sorona fibers fed in here can be flexibly adjusted according to requirements; (6) 2-paired and compounded: 8 2-paired hemp strips are fed in, with a draw ratio of 9±0.5 times, a strip weight of 11±0.2g / m, and a strip output speed of 26m / min; (7) 3-pair: 8 2-pair hemp strips are fed in, with a draw ratio of 10±0.5 times, a strip weight of 9.5±0.2g / m, and a strip output speed of 26m / min; (8) 4-pair: 4 x 3-pair hemp strips are fed in, with a draw ratio of 8 ± 0.5 times, a strip weight of 4.7 ± 2.5% g / m, and a strip output speed of 24 m / min; (9) Roving: Count controlled at 2.5, draft ratio 12±0.5 times, sliver weight 0.4±3% g / m, twist 28±1T / m, density 0.34±0.02g / cm3, spindle speed 650r / min; (S3) Post-spinning process: (1) Boiling and bleaching: The formed roving is placed in a specific chemical bath, and by adjusting the temperature, time and concentration of the reagent, non-cellulose impurities such as pectin and lignin are decomposed without damaging the main body of cellulose. (2) Fine yarn: The scouring and bleaching roving is stretched to the designed count and formed into a cohesive and stable tube yarn; (3) Drying: Radio frequency drying process is used to remove residual moisture from the fine yarn; (4) Winding: The winding process rewinds the fine yarn tubes into cones, removes yarn defects and harmful impurities by an electronic yarn clearer, and adjusts the cone forming density to meet the requirements of subsequent weaving and processing. (S4) Packaging.

[0008] Preferably, the ratio of hemp combed into hemp and solona fiber in the present invention is as follows: hemp fiber accounts for 60%-80%, and solona fiber accounts for 20%-40%; it can be flexibly adjusted according to requirements.

[0009] As a preferred embodiment, the specific process of scouring and bleaching in the post-spinning process (S3) of the present invention is as follows: (1) Pickling: Sulfuric acid with an auxiliary agent concentration of 3.0 g / L, and LUN (a penetrant) with an auxiliary agent concentration of 1.0-2.0 g / L; The auxiliary cylinder is treated with sulfuric acid solution at 30℃ and 3.0 g / L of additive for 5 min. (2) First water wash: auxiliary tank 30℃, treatment time is 5min; (3) Asian drifters: Sulfuric acid with 3.0-4.0 g / L of additives, penetrant with 1.0-1.2 g / L of additives, auxiliary tank 30℃, treatment for 10 min; Sodium chlorite in 3.0-5.0 g / L additives, sodium nitrate in 1.0-2.0 g / L additives; (4) Overflow: The processing time is 5 minutes; (5) Second water wash: auxiliary tank 30℃, treatment time is 5min; (6) Third water wash: auxiliary tank 30℃, treatment time is 5min; (7) Oxygen bleaching: 1.0-1.5 g / L of penetrant, 1.0-1.5 g / L of chelating dispersant, 3.0-4.0 g / L of liquid alkali, 4.0-6.0 g / L of soda ash, 3.0-4.0 g / L of sodium silicate, auxiliary tank 30℃, treatment time 5 min; Hydrogen peroxide with 6.0-9.0 g / L of additives, treatment time is 5 min; (8) Washing: 1.0-1.5 g / L of chelating dispersant for auxiliary agent, secondary tank 70℃, treatment time is 10 min; (9) Neutralization: 1.0-1.5 g / L of glacial acetic acid with additives, 50°C in the auxiliary tank, for 5 min; (10) Fourth water wash: auxiliary tank 30℃, treatment time is 10min.

[0010] As a preferred embodiment, the specific process parameters of the fine yarn in the (S3) post-spinning process of the present invention are as follows: count 39, draft ratio 13±0.5 times, twist 493T / m, nylon hook 130mg, spindle speed 5800±300 r / min.

[0011] As a preferred embodiment, the conventional process parameters for drying in the post-spinning process (S3) of the present invention are set as follows: radio frequency power 60-70%, electrode 75%, belt speed 3±0.3m / h, and moisture regain controlled at 5-7%.

[0012] As a preferred embodiment, the specific parameters of the winding in the (S3) post-spinning process of the present invention are as follows: yarn count 39, yarn bobbin size 58400m, yarn bobbin speed 800m / min, and winding density 0.35±0.01g / cm3.

[0013] Preferably, the electronic yarn clearer in the winding process of the post-spinning process described in this invention (S3) adopts the Uster third-generation electronic clearer device, which includes a capacitive linear density detection system, a periodic defect detection system, and a photoelectric foreign fiber detection system.

[0014] Preferably, in the pickling process described in (1) of this invention, a penetrant with 1.5 g / L of auxiliary agent is used, the temperature is 50°C, and the treatment time is 20 min.

[0015] Preferably, in the (3) bleaching process of the present invention, sodium chlorite with an auxiliary agent of 1.0 g / L is used, and the treatment time is 60-70 min at 55°C.

[0016] Preferably, in the oxygen bleaching process described in (7) of this invention, hydrogen peroxide with an auxiliary agent of 1.5 g / L is used at 90°C for a treatment time of 60-70 min.

[0017] Compared with the prior art, the present invention has the following advantages and effects: (1) The process design is reasonable and the blended yarn produced by the process meets the requirements of use and the spinnability is significantly improved: Hemp fiber is hard, has low elongation, general wet cohesion, and is easy to break when stretched. After blending with Sorona, the soft, high elongation and good cohesion of Sorona can significantly improve the stretching stability of wet-spun fine yarn and reduce breakage. Therefore, the spinnability of fine yarn is significantly better than that of pure wet-spun hemp, and the spinnable count is higher and the production is more stable. Based on the comparison of sample data, the breakage rate per 100 spindles of fine yarn increased by 75%, the shift output increased by 53%, and the winding efficiency increased by 25% (see Appendix 1). (2) Excellent yarn quality: good yarn evenness and less hairiness, solving the industry pain points of poor yarn evenness and large hairiness in hemp spinning. From the comparison of finished product indicators, the average elongation is increased by 6%, the -50% detail is reduced by 38%, the +200% neps are reduced by 51%, the +400% neps are reduced by 43%, the SH hairiness is reduced by 5%, and the H hairiness is reduced by 1% (see Appendix Table 2). (3) Significantly improved feel and comfort: The high resilience and softness of Sorona fiber neutralize the rigidity of hemp, making the yarn soft to the touch and itch-free. Its drape and skin-friendliness are significantly better than pure hemp yarn, meeting the needs of use. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0019] Example

[0020] The blending process of hemp fiber and Sorona fiber in this embodiment includes the following steps: raw material selection → pre-spinning process → post-spinning process → packaging.

[0021] The specific process is as follows: ① Raw material selection Main fiber: Hemp combed into hemp (fineness 550-750Nm, length 50-80cm, weight 31g / m); Sorona fiber: Specifications 1.5-3D, length 80-100mm, weight 20-22g / m; blending ratio: hemp fiber accounts for 60%-80%, Sorona fiber accounts for 20%-40% (can be adjusted flexibly according to requirements).

[0022] ② Pre-spinning process (sliver forming → roving) The pre-spinning drawing process achieves fiber quantity and evenness in the sliver through doubling and drafting, followed by drafting, twisting, and winding on a roving frame. The quality of the roving directly affects the scouring and bleaching penetration effect and the uniformity of fiber treatment. It is a core process ensuring the spinnability of the fine yarn, yarn quality, and the stability and controllability of the entire spinning process. The specific process is as follows: 1) Strip formation: 18 strips are fed in, with a draw ratio of 15±0.5 times and a strip weight of 36±1g / m; 2) 0-fold: 6 hemp strips are fed in, with a draw ratio of 8±0.5 times, a strip weight of 25±0.5g / m, and a strip output speed of 24m / min; 3) 0-fold re-extraction: 6 0-fold hemp strips are fed in, with a draw ratio of 8±0.5 times, a strip weight of 19±0.5g / m, and a strip output speed of 24m / min; 4) 1-piece: 8 0-piece hemp strips are fed in, with a draw ratio of 8±0.5 times, a strip weight of 17±0.3g / m, and a strip output speed of 25m / min; 5) 2-ply: 6 strands of 1-ply hemp sliver (17g / m) + 2 strands of Sorona fiber (20g / m) are fed in, with a draw ratio of 9.6±0.5 times, a sliver weight of 13±0.2 g / m, and a sliver speed of 26m / min (the amount of Sorona fiber added here can be adjusted flexibly according to requirements). 6) 2-paired and compounded: 8 2-paired hemp strips are fed in, with a draw ratio of 9±0.5 times, a strip weight of 11±0.2g / m, and a strip output speed of 26m / min; 7) 3-ply: 8 2-ply hemp strips are fed in, with a draw ratio of 10±0.5 times, a strip weight of 9.5±0.2g / m, and a strip output speed of 26m / min; 8) 4-pair: 4 hemp strips with 3-pairs are fed in, with a draw ratio of 8±0.5 times, a strip weight of 4.7±2.5% g / m, and a strip output speed of 24 m / min.

[0023] 9) Roving: Count controlled at 2.5, draft ratio 12±0.5, sliver weight 0.4±3% g / m, twist 28±1T / m, density 0.34±0.02g / cm3, spindle speed 650r / min; ③ Post-spinning process (scouring and bleaching → winding) 1) Boiling: The scouring and bleaching process involves placing the formed roving in a specific chemical bath. By controlling the temperature, time, and chemical concentration, non-fiber impurities such as pectin and lignin are decomposed without damaging the cellulose matrix. This improves fiber softness and surface properties, enhances yarn spinnability, and reduces yarn breakage. It is a key chemical treatment process to ensure the core quality of the yarn. The specific process is as follows: The specific processes for scouring and bleaching in the post-spinning process are as follows: (1) Pickling: Sulfuric acid with an auxiliary agent concentration of 3.0 g / L, and LUN (a penetrant) with an auxiliary agent concentration of 1.0-2.0 g / L; For the auxiliary tank, the sulfuric acid solution with 3.0 g / L of additive was used at 30°C for 5 min; and the penetrant with 1.5 g / L of additive was used at 50°C for 20 min. (2) First water wash: auxiliary tank 30℃, treatment time is 5min; (3) Asian drifters: Sulfuric acid with 3.0-4.0 g / L of additives, penetrant with 1.0-1.2 g / L of additives, auxiliary tank 30℃, treatment for 10 min; Sodium chlorite with 3.0-5.0 g / L additive, sodium nitrate with 1.0-2.0 g / L additive; sodium chlorite with 1.0 g / L additive, 55℃, treatment time 60-70 min; (4) Overflow: The processing time is 5 minutes; (5) Second water wash: auxiliary tank 30℃, treatment time is 5min; (6) Third water wash: auxiliary tank 30℃, treatment time is 5min; (7) Oxygen bleaching: 1.0-1.5 g / L of penetrant, 1.0-1.5 g / L of chelating dispersant, 3.0-4.0 g / L of liquid alkali, 4.0-6.0 g / L of soda ash, 3.0-4.0 g / L of sodium silicate; auxiliary tank 30℃, treatment time 5 min; For hydrogen peroxide with 6.0-9.0 g / L of additives, the treatment time is 5 min; for hydrogen peroxide with 1.5 g / L of additives, the treatment time is 60-70 min at 90℃. (8) Washing: Chelating and dispersing agent with 1.0-1.5 g / L of auxiliary agent, secondary tank 70℃, treatment time 10 min; (9) Neutralization: 1.0-1.5 g / L of glacial acetic acid with additives, 50°C in the auxiliary tank, for 5 minutes; (10) Fourth water wash: auxiliary tank 30℃, treatment time is 10min.

[0024] The detailed table of the boiling and rinsing process is as follows: 2) Fine yarn: The spinning process is a core link between the scouring and bleaching process and subsequent processing. It involves drafting the scouring and bleaching roving to the designed count and forming it into a stable, cohesive bobbin. Simultaneously, based on the fiber characteristics, key parameters such as the draft ratio and twist coefficient are set, directly determining the yarn's count, breaking strength, and evenness. This is a crucial process for translating the scouring and bleaching modification effect into the yarn's inherent properties and ensuring the quality of subsequent weaving and deep processing. Specific process parameters are as follows: 39 count, draft ratio 13±0.5, twist 493T / m, nylon hook 130mg, spindle speed 5800±300 r / min.

[0025] 3) Drying: Radio frequency drying technology is used to remove residual moisture from fine yarns, avoiding problems such as mildew and fiber sticking, and providing stable and suitable processing conditions for subsequent processes. The conventional process parameters are set as follows: radio frequency power 60-70%, electrode 75%, belt speed 3±0.3m / h, and moisture regain controlled at 5-7%.

[0026] 4) Winding tube: The winding process rewinds the fine yarn bobbin into cone yarn, using an electronic yarn clearer to remove yarn defects and harmful impurities, while simultaneously controlling the cone yarn formation density to meet the requirements of subsequent weaving and processing. The process follows conventional yarn winding standards, with the following specific parameters: yarn count 39, cone yarn size 58400m, cone yarn speed 800m / min, and winding density 0.35±0.01g / cm3.

[0027] The electro-cleaning process is as follows: 1) Channel settings 2) Fiber Optic Channel Settings The Uster electro-cleaning third-generation device used in this embodiment mainly consists of a capacitive linear density detection system, a periodic defect detection system, and a photoelectric foreign fiber detection system.

[0028] Among them, the capacitive linear density detection system is used to collect yarn linear density signals in real time, identify and judge common defects such as thick knots, thin knots, and cotton knots in the yarn; the periodic defect detection system is used to identify regular mechanical wave defects in the yarn caused by defects in the previous process equipment; and the photoelectric foreign fiber detection system is used to detect foreign colored fibers, oily yarn, etc. mixed in the yarn.

[0029] Each detection system processes and analyzes the collected signals. When a harmful defect exceeding a threshold is detected in the yarn, the actuator is driven to cut the yarn, achieving automatic online removal of the defect and thus improving yarn quality and the quality of subsequent fabrics. The effects of the blending process of hemp fiber and Sorona fiber in this embodiment are as follows: (1) Significantly improved spinnability: Hemp fibers are relatively hard, have low elongation, poor wet cohesion, and are easy to break when stretched. After being blended with Sorona, the softness, high elongation, and good cohesion of Sorona can significantly improve the stretching stability of wet-spun fine yarn and reduce breakage. Therefore, the spinnability of fine yarn is significantly better than that of pure wet-spun hemp, and the yarn count can be higher and the production is more stable.

[0030] Based on the comparison of sample data, the breakage rate per 100 spindles of fine yarn increased by 75%, the shift output increased by 53%, and the winding efficiency increased by 25% (see Appendix 1 for details).

[0031] (2) Excellent yarn quality: good yarn evenness and less hairiness, solving the industry pain points of poor yarn evenness and large hairiness in hemp spinning.

[0032] Comparing the finished product indicators, the average elongation increased by 6%, the -50% detail decreased by 38%, the +200% neps decreased by 51%, the +400% neps decreased by 43%, the SH fuzz decreased by 5%, and the H fuzz decreased by 1% (see Appendix 2 for details).

[0033] (3) Significantly improved feel and comfort: The high resilience and softness of Sorona fiber neutralize the rigidity of hemp, making the yarn soft to the touch, without any itching, and with significantly better drape and skin-friendliness than pure hemp yarn.

[0034] Appendix 1: Process Data Comparison Table Appendix 2: Comparison Table of Finished Product Indicators This embodiment demonstrates a blending process for hemp and sorona fibers. Through a specific ratio and wet spinning process, it addresses the problems of poor spinnability, high breakage rate, and stiffness and wrinkling in pure wet-spun hemp, achieving high-count, stable, and high-quality production, thus resulting in highly elastic and comfortable fabrics. The blending processes for other fibers are the same as in this embodiment, differing only in parameter settings.

[0035] Based on the above description, those skilled in the art are already able to implement it.

[0036] Furthermore, it should be noted that the specific embodiments described in this specification may have different shapes and names of parts and components. The above description in this specification is merely an illustrative example of the structure of the present invention.

Claims

1. A blending process for hemp fiber and Sorona fiber, characterized in that, Includes the following steps: (S1) Raw material selection: Hemp combed into hemp fibers with a fineness of 550-750 Nm, a length of 50-80 cm, and a weight of 31 g / m; Sorona fibers with a specification of 1.5-3D, a length of 80-100 mm, and a weight of 20-22 g / m. (S2) The specific process of the pre-spinning step is as follows: (1) Strip formation: 18 strips are fed in, the draw ratio is 15±0.5 times, and the weight of the strip is 36±1g / m; (2) 0 and: 6 hemp strips are fed in, the draw ratio is 8±0.5 times, the weight of the strip is 25±0.5g / m, and the strip output speed is 24m / min; (3) 0-fold re-extraction: 6 0-fold hemp strips are fed in, with a draw ratio of 8±0.5 times, a strip weight of 19±0.5g / m, and a strip speed of 24m / min; (4) 1 pair: 8 0 pair hemp strips are fed in, the draw ratio is 8±0.5 times, the weight of the strip is 17±0.3g / m, and the strip output speed is 25m / min; (5) 2-ply: 6 1-ply hemp slivers (17g / m) + 2 Sorona fibers (20g / m) are fed in, with a draw ratio of 9.6±0.5 times, a sliver weight of 13±0.2 g / m, and a sliver speed of 26m / min; (6) 2-paired and compounded: 8 2-paired hemp strips are fed in, with a draw ratio of 9±0.5 times, a strip weight of 11±0.2g / m, and a strip output speed of 26m / min; (7) 3-pair: 8 2-pair hemp strips are fed in, with a draw ratio of 10±0.5 times, a strip weight of 9.5±0.2g / m, and a strip output speed of 26m / min; (8) 4-pair: 4 x 3-pair hemp strips are fed in, with a draw ratio of 8 ± 0.5 times, a strip weight of 4.7 ± 2.5% g / m, and a strip output speed of 24 m / min; (9) Roving: Count controlled at 2.5, draft ratio 12±0.5 times, sliver weight 0.4±3% g / m, twist 28±1T / m, density 0.34±0.02g / cm3, spindle speed 650r / min; (S3) Post-spinning process: (1) Boiling and bleaching: The formed roving is placed in a specific chemical bath, and by adjusting the temperature, time and concentration of the reagent, non-cellulose impurities such as pectin and lignin are decomposed without damaging the main body of cellulose. (2) Fine yarn: The scouring and bleaching roving is stretched to the designed count and formed into a cohesive and stable tube yarn; (3) Drying: Radio frequency drying process is used to remove residual moisture from the fine yarn; (4) Winding: The winding process rewinds the fine yarn tubes into cones, removes yarn defects and harmful impurities by an electronic yarn clearer, and adjusts the cone forming density to meet the requirements of subsequent weaving and processing. (S4) Packaging.

2. The blending process of hemp fiber and sorona fiber according to claim 1, characterized in that: The proportions of hemp combed fibers and Sorona fiber are as follows: hemp fiber accounts for 60%-80%, and Sorona fiber accounts for 20%-40%.

3. The blending process of hemp fiber and Sorona fiber according to claim 1, characterized in that: The specific process of scouring and bleaching in the (S3) post-spinning process is as follows: (1) Pickling: Sulfuric acid with an auxiliary agent concentration of 3.0 g / L, and LUN (a penetrant) with an auxiliary agent concentration of 1.0-2.0 g / L; The auxiliary cylinder is treated with sulfuric acid solution at 30℃ and 3.0 g / L of additive for 5 min. (2) First water wash: auxiliary tank 30℃, treatment time is 5min; (3) Asian drifters: Sulfuric acid with 3.0-4.0 g / L of additives, penetrant with 1.0-1.2 g / L of additives, auxiliary tank 30℃, treatment for 10 min; Sodium chlorite in 3.0-5.0 g / L additives, sodium nitrate in 1.0-2.0 g / L additives; (4) Overflow: The processing time is 5 minutes; (5) Second water wash: auxiliary tank 30℃, treatment time is 5min; (6) Third water wash: auxiliary tank 30℃, treatment time is 5min; (7) Oxygen bleaching: 1.0-1.5 g / L of penetrant, 1.0-1.5 g / L of chelating dispersant, 3.0-4.0 g / L of liquid alkali, 4.0-6.0 g / L of soda ash, 3.0-4.0 g / L of sodium silicate; auxiliary tank 30℃, treatment time 5 min; Hydrogen peroxide with 6.0-9.0 g / L of additives, treatment time is 5 min; (8) Washing: Chelating and dispersing agent with 1.0-1.5 g / L of auxiliary agent, secondary tank 70℃, treatment time 10 min; (9) Neutralization: 1.0-1.5 g / L of glacial acetic acid with additives, 50°C in the auxiliary tank, for 5 minutes; (10) Fourth water wash: auxiliary tank 30℃, treatment time is 10min.

4. The blending process of hemp fiber and sorona fiber according to claim 1, characterized in that: The specific process parameters of the fine yarn in the (S3) post-spinning process are as follows: count 39, draft ratio 13±0.5 times, twist 493T / m, nylon hook 130mg, spindle speed 5800±300 r / min.

5. The blending process of hemp fiber and sorona fiber according to claim 1, characterized in that: The conventional process parameters for drying in the (S3) post-spinning process are set as follows: radio frequency power 60-70%, electrode 75%, belt speed 3±0.3m / h, and moisture regain controlled at 5-7%.

6. The blending process of hemp fiber and sorona fiber according to claim 1, characterized in that: The specific parameters of the winding in the (S3) post-spinning process are as follows: yarn count 39, yarn bobbin size 58400m, yarn bobbin speed 800m / min, and winding density 0.35±0.01g / cm3.

7. The blending process of hemp fiber and sorona fiber according to claim 1, characterized in that: The electronic yarn clearer in the winding process of the (S3) post-spinning process adopts the Uster third-generation electronic clearer device, which includes a capacitive linear density detection system, a periodic defect detection system, and a photoelectric foreign fiber detection system.

8. The blending process of hemp fiber and Sorona fiber according to claim 3, characterized in that: In the pickling process described in (1), a penetrant with an auxiliary agent of 1.5 g / L is used at 50°C for 20 min.

9. The blending process of hemp fiber and sorona fiber according to claim 3, characterized in that: In the (3) bleaching process, sodium chlorite with an auxiliary agent of 1.0 g / L is used at 55°C for a treatment time of 60-70 min.

10. The blending process of hemp fiber and sorona fiber according to claim 3, characterized in that: In the oxygen bleaching process described in (7), hydrogen peroxide with an auxiliary agent of 1.5 g / L is used at 90°C for a treatment time of 60-70 min.

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