Hemp fiber bleaching process and spinning method thereof

Abstract

The invention relates to the field of textile, and discloses a hemp fiber bleaching process, which comprises the steps of pre-acid treatment, water washing, alkali boiling-off, re-water washing, oxygen bleaching, third-time water washing and softening treatment. Through scientific and accurate process control, the whiteness of the bleached fibrilia reaches a high standard, fiber damage is reduced as much as possible, and high strength is kept. Compared with a traditional bleaching process, the method effectively solves the problem that the fiber strength loss is large in the bleaching process, the final finished product has better durability and attractiveness, meanwhile, through the reasonable softening treatment procedure, the softness of the jute fibers is remarkably improved, the hand feeling of the jute fibers is more comfortable and fine, and the spinnability of the fibers is enhanced. The linen fibers subjected to softening treatment can be efficiently blended with the cotton fibers, and the prepared cotton and linen blended yarn is excellent in cohesive force, softness and elasticity.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a flax fiber bleaching process and a spinning method thereof. Background Art

[0002] Hemp fiber is a natural fiber derived from the stems of plants. Its main component is cellulose, and it contains a small amount of pectin, fat and lignin. Due to its natural composition, hemp fiber has a series of excellent physical and chemical properties, such as good toughness, high strength, excellent moisture absorption, good water resistance, excellent thermal conductivity, and natural antibacterial and anti-mildew properties. These properties make hemp fiber widely used in the fields of textiles, clothing and home furnishings, especially for summer clothing, bed sheets, quilt covers and sofa covers.

[0003] However, there are some shortcomings in the use of hemp fiber. For example, it feels relatively hard and is not as soft as cotton fiber. It has poor wrinkle resistance and is prone to wrinkles during use. At the same time, it is also prone to breakage during processing. These shortcomings have limited the application of hemp fiber in high-quality textiles to a certain extent.

[0004] In order to improve the appearance and quality of hemp fiber, especially to enhance its whiteness, purity and color brightness, bleaching becomes an essential processing step. However, conventional bleaching agents may have adverse effects on human health when treating hemp fiber, and are generally less stable and easily cause fiber damage. Traditional bleaching methods not only fail to achieve the desired bleaching effect, but may also cause environmental pollution.

[0005] Therefore, the present invention proposes a hemp fiber bleaching process and a spinning method thereof to solve the deficiencies of the prior art. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a bleaching process for hemp fibers and a spinning method thereof, and provides an efficient hemp fiber bleaching process and a yarn preparation method thereof, so as to solve the problems of insufficient whiteness, large fiber damage, and hard hand feel existing in the prior hemp fiber processing. The process specifically includes a series of pretreatment, bleaching, washing and softening steps to ensure that the hemp fibers have high whiteness while minimizing the strong damage to the fibers as much as possible.

[0007] To achieve the above objectives, the present invention is implemented through the following technical scheme: a hemp fiber bleaching process, comprising the following steps: (1) Pre-acid treatment: Place the hemp fiber in a dye vat at a bath ratio of 1:8 to 1:12, add penetrant and glacial acetic acid for pre-acid treatment; (2) Washing: Wash the pre-acid treated hemp fiber in room temperature water for 2 to 4 times, with each washing time being 3 to 6 minutes; Water washing can effectively remove the residual acid and initially dissolved impurities in the fiber. Multiple water washings ensure that the acid is completely removed to avoid interference with the alkali solution or bleaching solution in subsequent processes.

[0008] Through sufficient water washing, the interference of residual acid on subsequent processes is avoided, the stability of the reaction during alkali boiling and bleaching is ensured, and the potential damage to the fiber caused by acid residue is prevented, ensuring the uniformity of the bleaching effect. (3) Alkali scouring: Place the hemp fiber in an alkali solution of caustic soda, soda ash and refining agent O at a bath ratio of 1:8 to 1:12, at a temperature of 95-100°C, and soak for 50 to 70 minutes; (4) Re-washing: Wash the alkali-scouring hemp fiber in room temperature water for 2 to 3 times, each washing time being 3 to 6 minutes; The re-washing process removes the impurities released during the alkali solution and alkali boiling process through multiple washings to ensure that the alkali solution is completely removed from the fiber to prevent chemical residual reactions in the subsequent bleaching process.

[0009] Multiple washings completely remove residual alkali, avoid affecting the bleaching process, prevent residual alkali from affecting the bleaching effect and fiber stability, and ensure that the fiber achieves ideal whiteness and appearance quality during the bleaching process.

[0010] (5) Oxygen bleaching: The washed hemp fiber is placed in a bleaching solution consisting of hydrogen peroxide, caustic soda, refining agent and penetrant at a temperature of 95-100°C for 45 to 60 minutes; (6) Three-water washing: the bleached hemp fiber is washed with hot water at 65-75°C for 2 to 3 times and with water at room temperature for 2 to 3 times, each washing time is 2 to 5 minutes; (7) Softening treatment: Use softening liquid to soften the bleached hemp fibers.

[0011] The softening liquid forms a flexible film on the fiber surface, which enhances the lubricity between fibers, reduces friction between fibers, and improves the soft feel of fibers. The role of silicone oil is to enhance the smoothness of fibers, and the penetrant helps the softening liquid adhere to the fibers more evenly.

[0012] The softening treatment significantly improves the feel of the hemp fiber, enhances its softness, makes the fiber more suitable for spinning, and improves the quality of the blended yarn. This process ensures the softness and delicate touch of the fiber, meeting the high requirements of textiles for feel and comfort.

[0013] Preferably, in the pre-acid treatment step, the ratio of the penetrant is 1-3%, the ratio of glacial acetic acid is 3-5 g / L, the acid solution temperature is 45-55° C., the soaking time is 15 to 25 minutes, and the pH value is 2.5 to 3.5.

[0014] The purpose of pre-acid treatment is to soften the surface of hemp fiber and initially decompose the pectin and wax in the fiber. By adding penetrant, the acid can penetrate into the fiber more evenly, accelerating the reaction between the acid and the pectin and impurities in the fiber.

[0015] Through pre-acid treatment, the colloid burden on the surface of hemp fiber is reduced, the efficiency of the subsequent alkali boiling process is improved, and the amount of alkali solution and boiling time are reduced. At the same time, the surface tension of the fiber is reduced, which increases the absorbency of the bleaching liquid and softening liquid in the subsequent process, making the bleaching and softening treatment effects more significant.

[0016] Preferably, in the alkali scouring step, the alkali solution formula is 6-10 g / L caustic soda, 2-4 g / L soda ash and 0.8-1.2% refining agent O, and the pH value is 12-14.

[0017] Alkali scouring removes lignin, pectin and wax from hemp fiber through the action of high-temperature alkali solution. Caustic soda has a strong decomposition ability and can effectively decompose impurities in the fiber, while soda ash adjusts the buffering capacity of the alkali solution to ensure that impurities in the fiber are fully decomposed during the scouring process.

[0018] Through alkali scouring, impurities and gum in hemp fibers are effectively removed, which improves the purity and softness of the fibers, reduces the hardness and roughness of the fibers, provides a higher absorbency basis for the subsequent bleaching steps, and improves the spinning performance and appearance quality of the fibers.

[0019] Preferably, in the oxygen bleaching step, the bleaching solution comprises 25-35 g / L of hydrogen peroxide, 3-5 g / L of caustic soda, 0.8-1.2% of refining agent O and 0.8-1.2% of penetrant JFC, and the pH value is 9.5 to 11.5.

[0020] Hydrogen peroxide decomposes under alkaline conditions to produce highly oxidizing active oxygen, which can decompose and remove natural pigments in fibers. Adding caustic soda adjusts the alkaline environment, speeds up the decomposition rate of hydrogen peroxide, and makes the bleaching reaction more thorough; the role of the penetrant is to help the bleaching solution penetrate more evenly into the fiber.

[0021] Through the oxygen bleaching process, the whiteness of hemp fiber is significantly improved, and the natural pigments and residual impurities in the fiber are completely decomposed and removed, ensuring uniform and stable bleaching. This bleaching process achieves high whiteness while ensuring fiber strength, avoiding excessive damage to the fiber caused by traditional bleaching methods.

[0022] Preferably, in the three water washing steps, the hot water washing temperature is 65-75°C, each washing time is 4 to 6 minutes, and the room temperature water washing time is 2 to 4 minutes.

[0023] Preferably, in the softening treatment step, the softening liquid formula is 0.3-0.7 g / L HAC, 5-7% silicone oil and 1-3% penetrant JFC, the softening liquid temperature is 35-45°C, the soaking time is 25 to 35 minutes, and the pH value is 4.5 to 5.5.

[0024] Hot water washing helps remove bleaching residues such as bleaching agents and decomposition products through higher temperatures; normal temperature washing further cleans the fibers and brings them to a neutral state, ensuring no odor and no residue.

[0025] The three-water washing thoroughly removes bleaching residues and impurities, making the fiber clean, providing a stable neutral basis for subsequent processing, avoiding the potential impact of chemical residues on the fiber, and ensuring the fiber's appearance is white, uniform and odorless.

[0026] Preferably, the spinning method of the hemp fiber yarn prepared by the hemp fiber bleaching process comprises the following steps: Wool blending process: Evenly blend the bleached hemp fibers with other fibers; Reasonable blending ratio not only enhances the softness of the yarn, but also maintains the natural characteristics of the hemp fiber, improves the antibacterial and breathability of the yarn, making it suitable for high-end textile products; Combing process: by adjusting the carding machine's cover plate and cylinder gauge and cylinder speed parameters, ensure that the hemp fibers are fully combed; Combining process: combining multiple raw slivers to adjust the uniformity of the slivers, and further drafting them into roving; Spinning process: the roving is further stretched and twisted to form spun yarn; The coarse and fine spinning processes make the fibers more evenly arranged and twisted into yarn, ensuring the uniform structure and moderate strength of the yarn, thus improving the yarn quality and spinnability.

[0027] Self-winding process: remove defects in the yarn through self-winding equipment and wind it into yarn rolls; Twisting process: The yarn is twisted to improve the structural stability of the yarn.

[0028] The self-winding equipment effectively removes defects in the yarn and ensures the quality of the yarn. The doubling process improves the strength and wear resistance of the yarn, making the final product more stable and durable during use.

[0029] Preferably, the yarn is a cotton / linen blended yarn with a blending ratio of 75-85% cotton / 15-25% linen and a specification of 45-50Nm / 2.

[0030] Preferably, in the carding process, the gauge between the cover plate and the cylinder is 10-15 thousandths of an inch, the gauge between the feed plate and the licker-in roller is 10-20 thousandths of an inch, the cylinder speed is 35-45 Hz, and the doffer speed is 18-28 Hz.

[0031] The optimized carding process can remove short fibers and impurities from the fibers, ensure that the fibers are straight and evenly arranged, and improve the quality and strength of the yarn.

[0032] Through the above technical scheme, the hemp fiber bleaching process and yarn preparation method of the present invention improve the softness and spinnability of the fiber while ensuring high whiteness and low damage, meet environmental protection requirements, and are suitable for large-scale industrial production.

[0033] The present invention provides a flax fiber bleaching process and a spinning method thereof, which have the following beneficial effects: 1. Hydrogen peroxide is used as the main bleaching agent to effectively remove natural pigments and impurities in hemp fibers while significantly improving the whiteness of the fibers. The present invention uses scientific and precise process control to achieve high standards in whiteness and fiber strength after bleaching, while minimizing fiber damage and maintaining high strength. Compared with traditional bleaching processes, this method effectively solves the problem of large fiber strength loss during the bleaching process, making the final product more durable and aesthetically pleasing.

[0034] 2. Through a reasonable softening process, the present invention significantly improves the softness of the hemp fiber, making it feel more comfortable and delicate, and enhancing the spinnability of the fiber. The softened hemp fiber can be efficiently blended with cotton fiber, and the resulting cotton and hemp blended yarn has excellent cohesion, softness and elasticity, and is suitable for the production of high-quality clothing, home furnishings and other textile products, meeting the market demand for soft and comfortable natural fibers.

[0035] 3. The bleaching process of the present invention uses environmentally friendly hydrogen peroxide as a bleaching agent, does not produce harmful chemical byproducts, has low pollutant content in process wastewater, meets environmental protection standards, and reduces the impact on the environment. At the same time, the process flow is simple and clear, the operating conditions are easy to control, and the entire process from pre-acid treatment to softening treatment is closely linked, which is convenient for large-scale production and promotion. Compared with the traditional multiple bleaching process, the process design of the present invention is reasonable, the cost is lower, the production efficiency is higher, and it is particularly suitable for industrial production needs.

[0036] 4. The process of the present invention not only removes impurities such as lignin and colloid in hemp fiber and improves the fiber quality, but also ensures that the fiber after bleaching is white in color and uniform in appearance, and is suitable for producing light-colored and white high-end textiles. The prepared cotton and linen blended yarn is of high quality and can be used for daily textiles such as clothing and bedding, as well as for home decorations with higher requirements. It has strong adaptability and can meet the growing demand of consumers for environmentally friendly, natural and comfortable products, providing greater space for the promotion and application of hemp fiber in the high-end textile market. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1This is the process flow chart of hemp fiber bleaching. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1: Hemp fiber bleaching process and yarn preparation method Pre-acid treatment process The acid solution was prepared using a bath ratio of 1:10, with the acid solution formula consisting of 4 g / L glacial acetic acid (HAC) and 2% JFC penetrant; The temperature of the acid solution was controlled at 50°C, the hemp fiber was immersed in the acid solution for 20 minutes, and the pH value was controlled at 3; This step reduces the surface tension of the fiber by removing some pectin and wax, providing better adsorption conditions for subsequent alkali scouring, and ensuring that the absorbency and softness of the hemp fiber are initially improved.

[0040] Washing process According to the bath ratio of 1:10, the pre-acid treated hemp fiber is placed in normal temperature water for washing; The cleaning time is set to 5 minutes, and clean water is replaced each time for each cleaning, which is repeated three times to ensure that the residual acid is completely removed, prevent the residual acid from affecting the subsequent alkali smelting process, and improve processing stability.

[0041] Alkali smelting process: Prepare the alkali solution at a bath ratio of 1:10, with the formula of 8g / L caustic soda (NaOH), 3g / L soda ash (Na2CO3) and 1% refining agent O; The lye solution was heated to 98°C and the hemp fibers were soaked under this temperature for 60 minutes. The pH value of the lye solution was set to 13. The alkali scouring process uses high-temperature alkali solution to decompose the lignin and pectin in the fiber, remove the gum, wax and impurities in the hemp fiber, improve the softness and spinning performance of the fiber, and create conditions for the subsequent bleaching process.

[0042] Re-washing process: The hemp fibers after alkali scouring were washed in normal temperature water at a bath ratio of 1:10 for 5 minutes, and the washing time was repeated twice; This step completely removes the residue in the alkali solution through multiple water washings, avoiding chemical reactions that may occur during the subsequent oxygen bleaching process, while ensuring that the fiber is not further damaged.

[0043] Oxygen bleaching process: Hydrogen peroxide (H2O2) is used as the oxygen bleaching agent. The bleaching solution formula is 30g / L hydrogen peroxide, 4g / L caustic soda, 1% refining agent O and 1% JFC penetrant, and the bath ratio is 1:10; The temperature of the bleaching solution was controlled at 98°C, the hemp fibers were soaked for 50 minutes, and the pH value was between 10-11; This bleaching process removes natural pigments from hemp fibers through oxidation, significantly improving whiteness and reducing residual impurities, thereby improving the appearance of the fibers and making them suitable for the production of light-colored or white textile products.

[0044] Three washing steps: The three-water washing includes two steps: (1) hot water washing, in which the oxygen-bleached hemp fiber is placed in 70°C hot water for 5 minutes at a bath ratio of 1:10, and this is repeated twice; (2) normal temperature water washing, in which the hemp fiber after hot water washing is placed in normal temperature water for two washes, each for 2-3 minutes; Hot water washing can remove residual bleach and prevent the potential impact of residual chemicals on the fiber. Normal temperature washing can further adjust the fiber to a neutral state, ensuring that the fiber has no odor and residual impurities, creating conditions for softening treatment.

[0045] Softening process: Use softening liquid for treatment. The softening liquid formula is 0.5g / L HAC, 6% silicone oil and 2% JFC penetrant, with a bath ratio of 1:10; The softening treatment temperature was set at 40°C, the hemp fibers were soaked in the softening solution for 30 minutes, and the pH value was maintained at 5; This process further improves the softness of the hemp fiber, reduces friction between fibers, enhances the feel and spinning performance of the fibers, and adapts to the needs of subsequent spinning processes.

[0046] Yarn preparation: The treated hemp fiber is blended with cotton fiber, the fiber blending ratio is 80% cotton / 20% hemp, and the yarn is prepared through the processes of wool combination, carding, coarse yarn, spun yarn, self-winding, and double twisting, and the yarn specification is 48Nm / 2; The key parameters are set as follows: the distance between the flat plate and the cylinder is 12-15 thousandths of an inch, the distance between the feed plate and the licker-in roller is 12-20 thousandths of an inch, the cylinder speed is 40Hz, the doffer speed is 20-25Hz, the dust removal knife height is +4, and the dust removal knife angle is 90°; The final cotton and linen blended yarn achieves ideal effects in softness, toughness and whiteness, and is suitable for high-quality textile production.

[0047] Comparative experiment: Comparative Example 1: The amount of hydrogen peroxide used in the oxygen bleaching process is different, and the other steps are the same as in Example 1 Oxygen bleaching process: The amount of hydrogen peroxide in the oxygen bleaching process was adjusted to 25 g / L, and other process parameters remained unchanged; This experiment reduced the amount of hydrogen peroxide used to observe its effect on the bleaching effect and fiber strength of hemp fiber.

[0048]

[0049] Result analysis: The fiber whiteness of Example 1 reached 52.27%, while that of Comparative Example 1 was only 49.12%, indicating that 30 g / L of hydrogen peroxide was more effective in improving whiteness; The strength of Comparative Example 1 is slightly higher, 14 cN, but the whiteness is insufficient, indicating that a more ideal balance between whiteness and strength can be obtained by appropriately increasing the amount of hydrogen peroxide. In general, the bleaching effect of Example 1 is better than that of Comparative Example 1, which shows that when the amount of hydrogen peroxide is 30 g / L, the appearance quality of the hemp fiber can be significantly improved and the strength can be maintained.

[0050] Comparative Example 2: Double bleaching process Double bleaching process: In Comparative Example 2, a bleaching step was added after the oxygen bleaching process. The bleaching solution formula was 15 g / L hydrogen peroxide, 3 g / L caustic soda, 0.5% refining agent O and 2% JFC penetrant. The bleaching solution temperature was 98°C, the immersion time was 50 minutes, and the pH value was 10-11. The secondary oxygen bleaching further removes pigments and impurities, aiming to achieve higher whiteness and a purer fiber state.

[0051] Four washing steps: After the second oxygen bleaching, four washings are carried out: two washings in 70°C hot water and two washings in room temperature water to ensure the removal of chemical residues after the second bleaching and maintain fiber stability.

[0052] Result analysis: After the double bleaching process, the whiteness of the hemp fiber is further improved to more than 54%, the impurities are removed more thoroughly, and the fiber color is uniform and stable; However, secondary bleaching makes the process more complicated, time-consuming and costly, making it unsuitable for large-scale production applications and only suitable for processing small batches and high-end products. Under industrial production conditions, the single bleaching process of Example 1 has achieved the whiteness and quality required by the market, and has cost advantages and process simplicity.

[0053] in conclusion: Example 1 demonstrates a single oxygen bleaching process under the condition of 30 g / L hydrogen peroxide, which has high whiteness and moderate fiber strength, meets the needs of large-scale production, and each process is simple and easy to perform, meeting environmental protection and safety requirements.

[0054] Comparative Example 1 reduced the bleaching effect by reducing the amount of hydrogen peroxide used. Although the strength was slightly improved, it was not enough to meet the whiteness requirement, indicating that the dosage of hydrogen peroxide has a significant effect on the bleaching effect.

[0055] Comparative Example 2 achieved higher whiteness through a double bleaching process, but the process was complicated, the cost increased, and it was not suitable for large-scale application. It was only suitable for small batches of high-end products, verifying the feasibility of secondary bleaching in special scenarios.

[0056] In summary, the process of Example 1 achieves a good balance in whiteness, fiber quality and production cost, ensures the superiority of the final product in performance and quality, meets the high-quality market demand, and provides a green and environmentally friendly solution for hemp fiber processing.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flax fiber bleaching process, characterized in that: The following steps are involved: (1) Pre-acid treatment: Place the hemp fiber in a dye vat at a bath ratio of 1:8 to 1:12, add penetrant and glacial acetic acid for pre-acid treatment; (2) Washing: Wash the pre-acid treated hemp fiber in room temperature water for 2 to 4 times, with each washing time being 3 to 6 minutes; (3) Alkali scouring: Place the hemp fiber in an alkali solution of caustic soda, soda ash and refining agent O at a bath ratio of 1:8 to 1:12, at a temperature of 95-100°C, and soak for 50 to 70 minutes; (4) Re-washing: Wash the alkali-scouring hemp fiber in room temperature water for 2 to 3 times, each washing time being 3 to 6 minutes; (5) Oxygen bleaching: The washed hemp fiber is placed in a bleaching solution consisting of hydrogen peroxide, caustic soda, refining agent and penetrant at a temperature of 95-100°C for 45 to 60 minutes; (6) Three-water washing: the bleached hemp fiber is washed with hot water at 65-75°C for 2 to 3 times and with water at room temperature for 2 to 3 times, each washing time is 2 to 5 minutes; (7) Softening treatment: Use softening liquid to soften the bleached hemp fibers.

2. A flax fiber bleaching process according to claim 1, characterized in that: In the pre-acid treatment step, the ratio of the penetrant is 1-3%, the ratio of glacial acetic acid is 3-5 g / L, the acid solution temperature is 45-55° C., the soaking time is 15 to 25 minutes, and the pH value is 2.5 to 3.

5.

3. A flax fiber bleaching process according to claim 1, characterized in that: In the alkali scouring step, the alkali solution formula is 6-10 g / L caustic soda, 2-4 g / L soda ash and 0.8-1.2% refining agent O, and the pH value is 12-14.

4. A flax fiber bleaching process according to claim 1, characterized in that: In the oxygen bleaching step, the bleaching solution is formulated as 25-35 g / L of hydrogen peroxide, 3-5 g / L of caustic soda, 0.8-1.2% of refining agent O and 0.8-1.2% of penetrant JFC, with a pH value of 9.5 to 11.

5.

5. A flax fiber bleaching process according to claim 1, characterized in that: In the three water washing steps, the hot water washing temperature is 65-75°C, each washing time is 4 to 6 minutes, and the room temperature water washing time is 2 to 4 minutes.

6. A flax fiber bleaching process according to claim 1, characterized in that: In the softening treatment step, the softening liquid formula is 0.3-0.7 g / L HAC, 5-7% silicone oil and 1-3% penetrant JFC, the softening liquid temperature is 35-45° C., the soaking time is 25 to 35 minutes, and the pH value is 4.5 to 5.

5.

7. A spinning method for hemp fiber yarn prepared by the hemp fiber bleaching process according to any one of claims 1 to 6, characterized in that: The following steps are involved: Wool blending process: Evenly blend the bleached hemp fibers with other fibers; Combing process: by adjusting the carding machine's cover plate and cylinder gauge and cylinder speed parameters, ensure that the hemp fibers are fully combed; Combining process: combining multiple raw slivers to adjust the uniformity of the slivers, and further drafting them into roving; Spinning process: the roving is further stretched and twisted to form spun yarn; Self-winding process: remove defects in the yarn through self-winding equipment and wind it into yarn rolls; Twisting process: The yarn is twisted to improve the structural stability of the yarn.

8. The spinning method of hemp fiber bleaching process according to claim 7, characterized in that: The yarn is a cotton / linen blended yarn with a blending ratio of 75-85% cotton / 15-25% linen and a specification of 45-50Nm / 2.

9. The spinning method of hemp fiber bleaching process according to claim 1, characterized in that: In the carding process, the gauge between the cover plate and the cylinder is 10-15 thousandths of an inch, the gauge between the feed plate and the licker-in roller is 10-20 thousandths of an inch, the cylinder speed is 35-45 Hz, and the doffer speed is 18-28 Hz.

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