Spinning process of silk and hemp blended yarn

Abstract

The present invention relates to a spinning process for a silk and hemp blended yarn. The process comprises a blend of 60-65% silk fiber and 35-40% hemp fiber. In a pretreatment step, the hemp fiber is subjected to a health-preserving treatment, and the silk fiber is treated with an eggshell membrane extract. The yarn is then subjected to blowroom, carding, drawing, roving, spinning, and post-processing steps to obtain the silk and hemp blended yarn. The blending process is simple and easy to operate. The silk and hemp blended yarn has improved durability and friction resistance, is resistant to tearing, wrinkling, and deformation, and has broad market application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning, and in particular relates to a process for spinning silk and hemp blended yarn. Background Art

[0002] Hemp fibers are the softest of all hemp fibers, only one-third the fineness of ramie. Their tips are blunt and rounded, unlike the sharp ends of ramie and flax. This makes hemp textiles soft and comfortable, eliminating the scratchiness and roughness often associated with other hemp textiles without the need for special processing. Silk is elegant, smooth, and comfortable, with a crystal-clear, lustrous sheen and a unique "silky" feel.

[0003] Silk and hemp blended yarn has the smoothness and drape of silk while having better durability, resistance to friction, not easy to tear, not easy to wrinkle, and not easy to deform. Therefore, silk and hemp blended yarn has broad application prospects.

[0004] The existing spinning process for silk and hemp blended yarn is difficult because silk is prone to static electricity during the spinning process, which can cause problems such as sticking and tangling. Hemp fibers have poor length uniformity, high bending stiffness, and poor inter-fiber cohesion, making them prone to brittle breakage during spinning and causing high yarn breakage rates. Therefore, in view of the current status of silk and hemp blended production, it is urgent to develop a spinning process for silk and hemp blended yarn to solve the problems encountered in actual production. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned problems in spinning of silk and hemp blended yarn and provides a spinning process for silk and hemp blended yarn.

[0006] The present invention adopts the following technical solution: a spinning process for silk and hemp blended yarn, taking 60-65% silk fiber and 35-40% hemp fiber as raw materials for blending, specifically comprising the following steps:

[0007] (1) Pretreatment: Hemp fiber health pretreatment, first, the hemp fiber is placed in a mixed enzyme solution and soaked for 5-10 minutes, the soaking temperature is 20-30 ° C, the mass ratio of xylanase: β-mannanase: pentosanase: pectinase in the mixed enzyme solution is 1-2:1-4:2-3:5, and then a cellulose-acrylic acid composite hydrogel solution is evenly sprayed on the surface of the hemp fiber, the pH of the cellulose-acrylic acid composite hydrogel solution is 5-7, and the spraying amount of the cellulose-acrylic acid composite hydrogel is 2-5 g / kg hemp fiber;

[0008] Silk: Evenly spray 2-3 g / L eggshell membrane extract solution on the surface of silk fibers and let it stand under vacuum for 10-20 minutes.

[0009] (2) Blowing process: Place the pre-treated hemp fiber and silk fiber in the cotton opening and cleaning machine, adjust the distance between the pressing curtain and the corner nail diagonal curtain to 40 mm, increase the speed of the corner nail diagonal curtain to 500-600 r / min, the temperature is 26-30 ° C, the humidity is 75-80%, and the fibers are fully opened by combing instead of beating;

[0010] (3) Carding process: cylinder speed is 280-300 r / min, licker-in speed is 600-650 r / min, flat speed is 81-100 mm / min, vehicle speed is 28-36 m / min, temperature is controlled at 28-32 ° C, humidity is 70-85%, and a uniformly mixed fiber sliver is obtained;

[0011] (4) Drawing process: sequentially through the first drawing, second drawing and final drawing, the number of fibers in the first drawing is 8, the number of fibers in the second drawing and final drawing is 6, the drafting multiple in the back zone decreases successively, so that the drawing is uniform without fiber winding around the rollers and peeling rollers, and a uniformly mixed fiber sliver is obtained. In the first drawing: the roller gauge is 13×13×19mm, the drafting multiple in the back zone is 1.8, and the sliver delivery speed is 200m / min; in the second drawing: the roller gauge is 13×13×19mm, the drafting multiple in the back zone is 1.5, and the sliver delivery speed is 180m / min; in the final drawing: the roller gauge is 60×56mm, the drafting multiple in the back zone is 1.2, and the sliver delivery speed is 180m / min;

[0012] (5) Roving process: The fiber sliver is passed through a false twister with a drafting gauge of 12.5 × 24 × 32 mm, a basis weight of 5.3 g / 10 m, a twist of 390 twists / 10 m, a spindle speed of 700 r / min, and a temperature and humidity of 32°C and 66% to obtain a roving roll;

[0013] (6) Spinning process: During the spinning process, the area is locally humidified and the compact spinning roller draft ratio is 1.055 to obtain a spun yarn roll;

[0014] (7) Post-treatment: The silk and hemp blended yarn obtained in step (6) is passed through a steam box containing a finishing agent solution in a bottom solution tank, and steam nozzles are symmetrically arranged on both sides of the steam box. The silk and hemp blended yarn passes through the middle of the steam nozzles at a passing rate of 5-6 m / min to obtain a silk and hemp blended yarn.

[0015] Furthermore, in the step (4), when the first fold is performed, the roller gauge is 13×13×19 mm, the drafting ratio in the rear zone is 1.8, and the strip delivery speed is 200 m / min; when the second fold is performed, the roller gauge is 13×13×19 mm, the drafting ratio in the rear zone is 1.5, and the strip delivery speed is 180 m / min; when the last fold is performed, the roller gauge is 60×56 mm, the drafting ratio in the rear zone is 1.2, and the strip delivery speed is 180 m / min.

[0016] Furthermore, the mass ratio of xylanase:β-mannanase:pentosanase:pectinase in the mixed enzyme solution is 1-2:1-4:2-3:5.

[0017] Furthermore, the relative humidity during the spinning process is 55-60% and the temperature is 30-33°C.

[0018] Furthermore, in step (2), the beater speed of the plucking machine is 650-700 r / min, the beater speed of the mixing and opening machine is 400-450 r / min, and the beater speed of the rolling machine is 900-1000 r / min.

[0019] Furthermore, the main process parameters of the spinning machine yarn are: basis weight 0.98g / 100m, total drafting multiple 67, back zone drafting multiple 1.25, roller gauge 18×25mm, twist 118 twists / cm, jaw 3.0, and spindle speed 11000r / min.

[0020] Furthermore, the mass concentration of the finishing agent solution in step (7) is 15-20 g / L, and the components in the finishing agent include, by weight, 2-8 parts of a dispersant, 6-8 parts of a nonionic surfactant, 5-10 parts of sodium alginate, 1-2 parts of sodium carbonate, 0.01-0.05 parts of silver nanoparticles, 5-10 parts of a waterproofing agent, and 16-18 parts of cyclodextrin, wherein the nonionic surfactant is a fatty acid polyol.

[0021] The advantages of the present invention are as follows:

[0022] (1) The hemp fibers in the present invention are subjected to a curing treatment before blending. First, they are soaked in a mixed enzyme solution to decompose and remove the colloid in the hemp fibers, and to remove impurities in the hemp fibers, thereby reducing the friction coefficient of the hemp fibers and increasing the softness and lubricity of the hemp fibers. Then, a cellulose-acrylic acid composite hydrogel solution is sprayed on the hemp fibers to fully maintain a certain moisture regain, thereby reducing the brittle breakage phenomenon during the blending process and improving the cohesion between the hemp fibers and the silk fibers.

[0023] (3) The silk fibers are treated with eggshell membrane extracts, which can be coated on the yarn fibers. The eggshell membrane extracts are rich in keratin, which can form an organic fiber network on the surface of the silk, and air can pass through this membrane freely. The keratin in the eggshell membrane extracts combines with the fibroin in the silk fibers to form long chains, which not only improves the flexibility and water resistance of the silk yarn, but also reduces the generation of static electricity, reduces the winding on the rollers during the drawing, roving and spinning processes, and improves the spinning efficiency during the blending process.

[0024] (4) After the blended yarn is completed and treated with a steam finishing agent, the antistatic property of the blended yarn is greatly improved. The non-ionic surfactant in the finishing agent can enhance the color fixing ability of the yarn, which provides a good foundation for the subsequent yarn dyeing steps. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention will be further explained and illustrated in conjunction with specific embodiments below.

[0026] The cellulose-acrylic acid composite hydrogel in the present invention was purchased from Henan Qirong Biotechnology Co., Ltd.

[0027] The eggshell membrane extract of the present invention was purchased from Shaanxi Bolin Biotechnology Co., Ltd.

[0028] The xylanase, β-mannanase, pentosanase and pectinase in the present invention were all purchased from Shanghai Guchen Biotechnology Co., Ltd.

[0029] Example 1: A spinning process for silk and hemp blended yarn, comprising the following steps:

[0030] Blending of 60% silk fiber and 40% hemp fiber as raw materials includes the following steps:

[0031] (1) Pretreatment: Hemp fiber health pretreatment, first, the hemp fiber is placed in a mixed enzyme solution and soaked for 5 minutes at a soaking temperature of 30°C, and then a cellulose-acrylic acid composite hydrogel solution is evenly sprayed on the surface of the hemp fiber, the pH of the cellulose-acrylic acid composite hydrogel solution is 5, and the spraying amount of the cellulose-acrylic acid composite hydrogel is 5g / kg of hemp fiber;

[0032] Silk: Evenly spray 3 g / L eggshell membrane extract solution on the surface of silk fibers and let it stand under vacuum for 10 minutes.

[0033] (2) Blowing process: The pretreated hemp fiber and silk fiber are placed in the cotton opening and cleaning machine, the distance between the pressing curtain and the angle nail curtain is adjusted to 40 mm, the angle nail curtain speed is increased to 500 r / min, the temperature is 26 ° C, the humidity is 80%, and the fibers are fully opened by combing instead of beating. The speed of the cotton plucking machine beater is 650 r / min, the speed of the mixed cotton opening machine beater is 450 r / min, and the speed of the lap forming machine beater is 900 r / min;

[0034] (3) Carding process: The carding machine parameters are: cylinder speed of 300 r / min, licker-in speed of 600 r / min, flat speed of 100 mm / min, vehicle speed of 28 m / min, temperature controlled at 28°C, humidity of 70%, so that the silk fiber and hemp fiber are mixed evenly into fiber slivers;

[0035] (4) Drawing process: The fiber slivers are sequentially drawn through the first drawing, the second drawing and the final drawing. The number of fibers in the first drawing is 8, and the number of fibers in the second drawing and the final drawing are both 6. The drafting multiples in the back zone are gradually reduced to ensure that the drawing is fully uniform without fiber winding around the rollers and the peeling rollers, and a uniformly mixed fiber sliver is obtained.

[0036] (5) Roving process: The fiber sliver is passed through a false twister with a drafting gauge of 12.5×24×32 mm, a basis weight of 5.3 g / 10 m, a twist of 390 twists / 10 m, a spindle speed of 700 r / min, a temperature of 32°C, and a humidity of 66% to obtain a roving roll;

[0037] (6) Spinning process: During the spinning process, an automatic moistening device was set to moisten the local area every 30 seconds. The relative humidity during the spinning process was 60%, the temperature was 30°C, the compact spinning roller draft ratio was 1.055, and the main process parameters of the spinning machine yarn were: basis weight 0.98g / 100m, total draft ratio 67, back zone draft ratio 1.25, roller gauge 18×25mm, twist 118 twists / cm, jaw 3.0, and spindle speed 11000r / min to obtain the spinning roll;

[0038] (7) Post-treatment: The silk and hemp blended yarn obtained in step (6) is passed through a steam box having a solution tank at the bottom thereof containing a finishing agent solution, wherein the content of the finishing agent solution is 15 g / L, and the components of the finishing agent include, by weight, 8 parts of a dispersant, 6 parts of a nonionic surfactant, 10 parts of sodium alginate, 1 part of sodium carbonate, 0.05 parts of silver nanoparticles, 5 parts of a waterproofing agent, and 18 parts of cyclodextrin. The nonionic surfactant is a fatty acid polyol. Steam nozzles are symmetrically provided on both sides of the steam box, and the silk and hemp blended yarn passes through the middle of the steam nozzles at a passing rate of 5 m / min to obtain a silk and hemp blended yarn.

[0039] Example 2: A spinning process for silk and hemp blended yarn, comprising the following steps:

[0040] Blending of 62% silk fiber and 38% hemp fiber as raw materials includes the following steps:

[0041] (1) Pretreatment: Hemp fiber health pretreatment, first, the hemp fiber is placed in a mixed enzyme solution and soaked for 8 minutes at a soaking temperature of 25°C, and then a cellulose-acrylic acid composite hydrogel solution is evenly sprayed on the surface of the hemp fiber, the pH of the cellulose-acrylic acid composite hydrogel solution is 6, and the spraying amount of the cellulose-acrylic acid composite hydrogel is 3g / kg of hemp fiber;

[0042] Silk: Evenly spray 2.5 g / L eggshell membrane extract solution on the surface of silk fibers and let it stand under vacuum for 15 minutes.

[0043] (2) Blowing process: The pretreated hemp fiber and silk fiber are placed in the cotton opening and cleaning machine, the distance between the pressing curtain and the angle nail diagonal curtain is adjusted to 40 mm, the angle nail diagonal curtain speed is increased to 550 r / min, the temperature is 28 ° C, the humidity is 75%, and the fibers are fully opened by combing instead of beating. The speed of the cotton plucking machine beater is 660 r / min, the speed of the mixed cotton opening machine beater is 420 r / min, and the speed of the lap forming machine beater is 950 r / min;

[0044] (3) Carding process: The carding machine parameters are: cylinder speed 290 r / min, licker-in speed 620 r / min, flat speed 90 mm / min, vehicle speed 30 m / min, temperature controlled at 30°C, humidity 80%, so that the silk fiber and hemp fiber are mixed evenly into fiber slivers;

[0045] (4) Drawing process: The fiber slivers are sequentially drawn through the first drawing, the second drawing and the final drawing. The number of fibers in the first drawing is 8, and the number of fibers in the second drawing and the final drawing are both 6. The drafting multiples in the back zone are gradually reduced to ensure that the drawing is fully uniform without fiber winding around the rollers and the peeling rollers, and a uniformly mixed fiber sliver is obtained.

[0046] (5) Roving process: The fiber sliver is passed through a false twister with a drafting gauge of 12.5 × 24 × 32 mm, a basis weight of 5.3 g / 10 m, a twist of 390 twists / 10 m, a spindle speed of 700 r / min, and a temperature and humidity of 32°C and 66% to obtain a roving roll;

[0047] (6) Spinning process: During the spinning process, an automatic moistening device was set to moisten the local area every 35 seconds. The relative humidity during the spinning process was 58%, the temperature was 32°C, the compact spinning roller draft ratio was 1.055, and the main process parameters of the spinning machine yarn were: basis weight 0.98g / 100m, total draft ratio 67, back zone draft ratio 1.25, roller gauge 18×25mm, twist 118 twists / cm, jaw 3.0, and spindle speed 11000r / min to obtain the spinning roll;

[0048] (7) Post-treatment: The silk and hemp blended yarn obtained in step (6) is passed through a steam box having a finishing agent solution in a bottom solution tank, wherein the content of the finishing agent solution is 18 g / L, and the components of the finishing agent include, by weight, 5 parts of a dispersant, 7 parts of a nonionic surfactant, 8 parts of sodium alginate, 1 part of sodium carbonate, 0.02 parts of silver nanoparticles, 8 parts of a waterproofing agent, and 17 parts of cyclodextrin. The nonionic surfactant is a fatty acid polyol. Steam nozzles are symmetrically provided on both sides of the steam box, and the silk and hemp blended yarn passes through the middle of the steam nozzles at a passing rate of 5.5 m / min to obtain a silk and hemp blended yarn.

[0049] Example 3: A spinning process for silk and hemp blended yarn, comprising the following steps:

[0050] Blending of 65% silk fiber and 35% hemp fiber as raw materials includes the following steps:

[0051] (1) Pretreatment: Hemp fiber health pretreatment, first, the hemp fiber is placed in a mixed enzyme solution and soaked for 10 minutes at a soaking temperature of 20°C, and then a cellulose-acrylic acid composite hydrogel solution is evenly sprayed on the surface of the hemp fiber, wherein the pH of the cellulose-acrylic acid composite hydrogel solution is 7, and the spraying amount of the cellulose-acrylic acid composite hydrogel is 2-5 g / kg of hemp fiber;

[0052] Silk: Evenly spray 2 g / L eggshell membrane extract solution on the surface of silk fibers and let it stand under vacuum for 20 minutes.

[0053] (2) Blowing process: The pre-treated hemp fiber and silk fiber are placed in the cotton opening and cleaning machine, the distance between the pressing curtain and the angle nail diagonal curtain is adjusted to 40 mm, the angle nail diagonal curtain speed is increased to 600 r / min, the temperature is 30 ° C, the humidity is 75%, and the fibers are fully opened by combing instead of beating. The speed of the cotton plucking machine beater is 700 r / min, the speed of the mixed cotton opening machine beater is 400 r / min, and the speed of the lap forming machine beater is 1000 r / min;

[0054] (3) Carding process: The carding machine parameters are: cylinder speed of 280 r / min, licker-in speed of 650 r / min, flat speed of 81 mm / min, vehicle speed of 36 m / min, temperature controlled at 32°C, humidity of 85%, so that the silk fiber and hemp fiber are mixed evenly into fiber slivers;

[0055] (4) Drawing process: The fiber slivers are sequentially drawn through the first drawing, the second drawing and the final drawing. The number of fibers in the first drawing is 8, and the number of fibers in the second drawing and the final drawing are both 6. The drafting multiples in the back zone are gradually reduced to ensure that the drawing is fully uniform without fiber winding around the rollers and the peeling rollers, and a uniformly mixed fiber sliver is obtained.

[0056] (5) Roving process: The fiber sliver is passed through a false twister with a drafting gauge of 12.5×24×32 mm, a basis weight of 5.3 g / 10 m, a twist of 390 twists / 10 m, a spindle speed of 700 r / min, a temperature of 32°C, and a humidity of 66% to obtain a roving roll;

[0057] (6) Spinning process: During the spinning process, an automatic moistening device was set to moisten the local area every 50 seconds. The relative humidity during the spinning process was 55%, the temperature was 33°C, the compact spinning roller draft ratio was 1.055, and the main process parameters of the spinning machine yarn were: basis weight 0.98g / 100m, total draft ratio 67, back zone draft ratio 1.25, roller gauge 18×25mm, twist 118 twists / cm, jaw 3.0, and spindle speed 11000r / min to obtain the spinning roll;

[0058] (7) Post-treatment: The silk and hemp blended yarn obtained in step (6) is passed through a steam box having a solution tank at the bottom thereof containing a finishing agent solution, wherein the content of the finishing agent solution is 20 g / L, and the components of the finishing agent include, by weight, 2 parts of a dispersant, 8 parts of a nonionic surfactant, 5 parts of sodium alginate, 2 parts of sodium carbonate, 0.01 parts of silver nanoparticles, 10 parts of a waterproofing agent, and 16 parts of cyclodextrin. The nonionic surfactant is a fatty acid polyol. Steam nozzles are symmetrically provided on both sides of the steam box, and the silk and hemp blended yarn passes through the middle of the steam nozzles at a passing rate of 6 m / min to obtain a silk and hemp blended yarn.

[0059] Comparative Example 1

[0060] The method and steps are the same as those in Example 2, except that the hemp fiber is subjected to ordinary health treatment and the silk fiber is not pretreated.

[0061] Comparative Example 2

[0062] The method and steps are the same as those in Example 2, but the silk and hemp blended yarn is not treated.

[0063] The properties of the silk and hemp blended yarns prepared in Examples 1-3 and Comparative Examples 1-2 were tested. The results are shown in Table 1.

[0064] Table 1 Yarn testing indicators and results

[0065]

[0066]

[0067] As can be seen from Table 1, the blended yarns prepared by Examples 1-3 of the blending process of the present invention have less hairiness and uniform yarn evenness, and the breaking strength of the single yarn is also improved in quality. The thick and thin indexes in the single yarn are good, and the yarn is smooth. The mixed yarns prepared by using ordinary pretreated hemp fiber and untreated silk obviously have more cotton neps, thick sections and thin sections. This is because the untreated hemp fiber and silk have different properties, and their cohesion ability is poor during the blending process, and joint defects are prone to occur after the blended yarn.

Claims

1. A spinning process for silk and hemp blended yarn, characterized by: The blending process is to take 60-65% of silk fiber and 35-40% of hemp fiber as raw materials, and specifically includes the following steps: (1) Pretreatment: Hemp fiber health pretreatment, first, the hemp fiber is placed in a mixed enzyme solution and soaked for 5-10 minutes at a soaking temperature of 20-30°C, and then a cellulose-acrylic acid composite hydrogel solution is evenly sprayed on the surface of the hemp fiber. The pH of the cellulose-acrylic acid composite hydrogel solution is 5-7, and the spraying amount of the cellulose-acrylic acid composite hydrogel is 2-5g / kg of hemp fiber; Silk: Evenly spray 2-3 g / L eggshell membrane extract solution on the surface of silk fibers and let it stand under vacuum for 10-20 minutes. (2) Blowing process: Place the pre-treated hemp fiber and silk fiber in the cotton opening and cleaning machine, adjust the distance between the pressing curtain and the corner nail diagonal curtain to 40mm, increase the speed of the corner nail diagonal curtain to 500-600r / min, the temperature is 26-30℃, the humidity is 75-80%, and the fibers are fully opened by combing instead of beating; (3) Carding process: The carding machine parameters are: cylinder speed 280-300 r / min, licker-in speed 600-650 r / min, flat speed 81-100 mm / min, vehicle speed 28-36 m / min, temperature controlled at 28-32 ° C, humidity 70-85%, so that the silk fiber and hemp fiber are mixed evenly into fiber slivers; (4) Drawing process: The fiber slivers are sequentially drawn through the first drawing, second drawing and final drawing. The number of fibers in the first drawing is 8, and the number of fibers in the second drawing and final drawing is 6. The drafting multiples in the back zone are reduced in sequence to ensure that the drawing is fully uniform without fiber winding around the rollers and peeling rollers, and a uniformly mixed fiber sliver is obtained. (5) Roving process: The fiber sliver is passed through a false twister with a drafting gauge of 12.5×24×32 mm, a basis weight of 5.3 g / 10 m, a twist of 390 twists / 10 m, a spindle speed of 700 r / min, a temperature of 32°C, and a humidity of 66% to obtain a roving roll; (6) Spinning process: During the spinning process, an automatic moistening device is set to moisten the area every 30-50 seconds. The draft ratio of the compact spinning roller is 1.055 to obtain a spinning roll. (7) Post-treatment: The silk and hemp blended yarn obtained in step (6) is passed through a steam box containing a finishing agent solution in a bottom solution tank, and steam nozzles are symmetrically arranged on both sides of the steam box. The silk and hemp blended yarn passes through the middle of the steam nozzles at a passing rate of 5-6 m / min to obtain a silk and hemp blended yarn; The mass concentration of the finishing agent solution in step (7) is 15-20 g / L, and the components in the finishing agent include, by weight, 2-8 parts of a dispersant, 6-8 parts of a nonionic surfactant, 5-10 parts of sodium alginate, 1-2 parts of sodium carbonate, 0.01-0.05 parts of silver nanoparticles, 5-10 parts of a waterproofing agent, and 16-18 parts of cyclodextrin. The nonionic surfactant is a fatty acid polyol.

2. The spinning process of the silk and hemp blended yarn according to claim 1, characterized in that: In the step (4), when the first doubling is performed, the roller gauge is 13×13×19 mm, the drafting ratio in the rear zone is 1.8, and the strip delivery speed is 200 m / min; when the second doubling is performed, the roller gauge is 13×13×19 mm, the drafting ratio in the rear zone is 1.5, and the strip delivery speed is 180 m / min; when the last doubling is performed, the roller gauge is 60×56 mm, the drafting ratio in the rear zone is 1.2, and the strip delivery speed is 180 m / min.

3. The spinning process of the silk and hemp blended yarn according to claim 1, characterized in that: The mass ratio of xylanase:β-mannanase:pentosanase:pectinase in the mixed enzyme solution is 1-2:1-4:2-3:

5.

4. The spinning process of the silk and hemp blended yarn according to claim 1, characterized in that: During the spinning process, the relative humidity is 55-60% and the temperature is 30-33°C.

5. The spinning process of the silk and hemp blended yarn according to claim 1, characterized in that: In step (2), the beater speed of the cotton plucking machine is 650-700 r / min, the beater speed of the cotton mixing and opening machine is 400-450 r / min, and the beater speed of the lap forming machine is 900-1000 r / min.

6. The spinning process of the silk and hemp blended yarn according to claim 1, characterized in that: The main process parameters of the spinning process are: basis weight 0.98g / 100m, total draft ratio 67, back zone draft ratio 1.25, roller gauge 18×25mm, twist 118 twists / cm, jaw 3.0, and spindle speed 11000r / min.

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