Preparation method of light, thin, breathable and cashmere-like knitted fabric and knitted fabric prepared by the method

Abstract

This invention relates to the field of knitted fabric processing technology, and discloses a method for preparing a lightweight, breathable, cashmere-like knitted fabric and the knitted fabric prepared therefrom. The method uses combed cotton and biodegradable polyvinyl alcohol (PVA) water-soluble vinylon blended melt-spun yarn as raw materials. The yarn is knitted into a double-ribbed cotton greige fabric using a double-sided circular knitting machine. Then, the PVA water-soluble vinylon fibers are completely dissolved in a precisely temperature-controlled water bath, creating a microporous structure within the fibers. Finally, the finished fabric is obtained through low-auxiliary dyeing and setting. By limiting the raw material ratio, yarn length, water-soluble defiberization temperature and time ratio, and the entire dyeing process parameters, a durable, cashmere-like soft and fluffy feel can be achieved without a large amount of chemical softening agents. The fabric's microporous structure significantly improves breathability and moisture permeability. The raw materials are completely biodegradable, and the production process is green and environmentally friendly. This method improves the uniformity of the fabric's microporous structure, enhances its lightness and breathability, improves its washability, and gives it a fluffy and soft feel.

Description

Technical Field

[0001] This invention relates to the field of knitted fabric processing technology, and in particular to a method for preparing a lightweight, breathable, cashmere-like knitted fabric and the knitted fabric prepared therefrom. Background Technology

[0002] Cashmere fabrics possess excellent fluffiness, softness, and skin-friendly warmth, making them widely used in the apparel and textile industry. However, the scarcity of natural cashmere raw materials and their high procurement costs, coupled with the high pollutant content and difficult degradation of wastewater generated during cashmere processing, restrict the large-scale industrial production of natural cashmere fabrics due to both cost and environmental constraints. Currently, most imitation cashmere knitted fabrics on the market are made from ultra-fine polyester or viscose filaments through pure or blended spinning. They achieve a cashmere-like feel primarily by applying large amounts of chemical softening agents such as silicone oil and softening oil. However, these imitation cashmere knitted fabrics, made from traditional synthetic fibers, have poor moisture absorption and breathability, leading to stuffiness and a poor skin-friendly experience. Furthermore, the fabric's feel is highly dependent on high doses of chemical softening agents; after 3-5 washes, a significant amount of these agents are lost from the fabric surface, resulting in a noticeably stiffer feel and poor wash resistance. In addition, synthetic fibers such as polyester and viscose are not biodegradable, easily generating textile solid waste after the fabric is discarded, causing environmental pollution.

[0003] Existing technologies use water-soluble fiber blended fabrics to address the shortcomings of the aforementioned chemical fiber fabrics. However, the existing manufacturing process of water-soluble blended imitation cashmere fabrics suffers from problems such as poor parameter controllability, incomplete fiber removal, and poor fabric pore structure. It is difficult to simultaneously achieve the fabric's lightweight characteristics, high breathability, and lasting imitation cashmere fluffy feel, and mass production stability is poor. Therefore, it is urgent to address the numerous shortcomings of the existing technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a lightweight, breathable, cashmere-like knitted fabric and the knitted fabric prepared therefrom, which can improve the uniformity of the fabric's micropore structure, enhance the fabric's lightness and breathability, improve the fabric's washability and stability, and give the fabric a fluffy and soft feel.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a method for preparing a lightweight, breathable, cashmere-like knitted fabric, comprising the following steps: S1. Raw material spinning: Combed cotton and polyvinyl alcohol water-soluble vinylon are blended as raw materials to prepare cotton yarn, which is then used as a weaving raw material. S2. Fabric weaving: Using a double-sided weft knitting machine, the weaving raw material obtained in step S1 is woven to produce a fabric with a double rib cotton wool structure. S3, Water-soluble defiber removal: The fabric obtained in step S2 is subjected to water bath heating treatment. By heating in a water bath, the polyvinyl alcohol water-soluble vinylon contained in the fabric yarn is completely dissolved and removed, thereby forming a microporous structure inside the yarn fiber. S4. Dyeing, finishing and setting: The greige fabric after water-soluble defiber treatment in step S3 is sequentially cleaned, dyed, softened and set to obtain a finished knitted fabric with a continuous microporous structure.

[0006] By adopting the above technical solution, unlike existing imitation cashmere fabrics that rely on chemical fiber raw materials and a large amount of softening agents to create a fluffy surface effect, this application first blends combed cotton with polyvinyl alcohol water-soluble vinylon to obtain a grey fabric, and then completely dissolves the polyvinyl alcohol water-soluble vinylon component in the yarn through a water bath defiberization process, constructing a continuous and uniform microporous structure inside the fiber, thus improving the uniformity of the fabric's microporous structure. The fluffy feel of the fabric is provided by the physical microporous structure inside the fiber, rather than entirely by the chemical auxiliaries attached to the surface. This reduces the amount of softening agents needed. At the same time, the microporous structure formed inside the fiber improves breathability, enhancing the fabric's lightness and breathability. Thanks to the stable and continuous internal microporous structure, even if a small amount of surface auxiliaries are lost, the fabric's fluffy characteristics are still retained. This improves the fabric's washability and overcomes the shortcomings of traditional synthetic fiber imitation cashmere fabrics, such as poor breathability and poor washability, giving the fabric a fluffy and soft imitation cashmere feel.

[0007] A further feature of the present invention is that, in step S1, the blended raw material is 40S / 1 to 50S / 1 combed cotton combined with 30D to 75D polyvinyl alcohol water-soluble vinylon. By weight percentage, combed cotton fiber accounts for 75% to 85%, and polyvinyl alcohol water-soluble vinylon accounts for 15% to 25%.

[0008] By adopting the above technical solution, if the proportion of polyvinyl alcohol water-soluble vinylon is too low, it will be difficult to generate a sufficient amount of microporous void structure after defibering; if the proportion of polyvinyl alcohol water-soluble vinylon is too high, it will reduce the overall strength of the blended yarn and make it easy for yarn breakage to occur during weaving. The above ratio can balance the relationship between the breaking stress of the blended yarn and the amount of microporous void structure generated after defibering.

[0009] A further feature of the present invention is that in step S1, the specifications of the fabricated raw material are 30S / 1 to 40S / 1.

[0010] By adopting the above technical solution and selecting blended yarns within this count range, the lightweight characteristics of the greige fabric and the weaving stability can be taken into account. After water-soluble defiber treatment, finished fabrics with suitable weight can be obtained.

[0011] A further provision of the present invention is that the polyvinyl alcohol water-soluble vinylon is prepared from raw materials that are completely biodegradable.

[0012] By adopting the above technical solution, the polyvinyl alcohol dissolved during the water-soluble defibering process has good biodegradability. The fabric matrix is ​​mainly composed of combed cotton fibers, and the product can be naturally degraded after disposal, thus alleviating the environmental pollution caused by textile solid waste.

[0013] A further feature of the present invention is that in step S2, a 20-28G double-sided circular knitting machine is used to weave the greige fabric, and the weaving process adopts a cotton-wool needle-knitting structure, controlling the weaving yarn length to be between 30-32cm / 100G, to obtain the greige fabric.

[0014] By adopting the above technical solution, the double rib cotton wool structure, combined with the corresponding machine specifications and weaving yarn length parameters, results in a uniform fabric structure and a smooth fabric surface. This facilitates the uniform penetration of the water bath medium into the interior of the fabric, creating conditions for uniform fiber removal and the formation of a continuous microporous structure, thus ensuring the performance consistency of mass-produced products.

[0015] A further setting of the present invention is as follows: in the water-soluble defibering process of step S3, the water bath ratio is controlled to be 1:(9-13), the treatment temperature is between 60 and 90°C, and the heat treatment time is 40 to 60 minutes.

[0016] By adopting the above technical solution, the process parameter range can ensure that the polyvinyl alcohol water-soluble vinylon is fully dissolved, avoiding insufficient microporous structure due to incomplete fiber removal.

[0017] A further feature of the present invention is that in the dyeing and finishing process of step S4, the dye bath ratio is controlled to be 1:(22-26), the amount of sodium sulfate added is 6-10 g / L, and the amount of soda ash added is 2-4 g / L.

[0018] By adopting the above technical solution, the liquor ratio and the dosage of dyeing accelerator and fixing agent are matched with each other, which promotes the uniform dyeing of reactive dyes on combed cotton fibers, improves the uniformity of fabric dyeing, and enhances the color fastness of dyeing.

[0019] A further provision of the present invention is that in the dyeing and finishing process of step S4, reactive dyes and softeners are added in a controlled manner, and the amount of reactive dyes is controlled to be 5% to 8% of the fabric mass, and the amount of softener added is 1 to 3 g / L.

[0020] By adopting the above technical solution, this application relies on the microporous structure of fibers to form a basic fluffy feel. Only a low dose of softener is needed to reduce the amount of additives adhering to the fabric surface. After washing, the hand feel is not prone to rapid decay, effectively improving the fabric's washability and stability.

[0021] A further feature of the present invention is that the finished knitted fabric obtained in step S4 has a weight controlled to be 140–160 g / m². 2 The width is 145-165cm.

[0022] By adopting the above technical solutions, the fabrics in this specification range are moderately thin and lightweight, with excellent drape and wearing comfort, and are suitable for the processing and manufacturing of various clothing categories such as shirts, underwear, and knitted tops.

[0023] Another technical objective of this invention is to provide a knitted fabric with a lightweight, breathable, cashmere-like feel, which is made using the above-described preparation method.

[0024] By adopting the above technical solution, a continuous microporous structure is formed inside the fabric, which helps to improve the fabric's breathability and the durability of its fluffy feel. The fabric raw material is environmentally friendly and easy to degrade, and has a wide range of applications.

[0025] In summary, the present invention has the following beneficial effects: 1. This fabric is made from a blend of combed cotton and polyvinyl alcohol water-soluble vinylon. Through water-soluble defiberization, a continuous microporous structure is formed inside the fiber. The fluffy feel is achieved by relying on the physical structure of the fiber itself, reducing the dependence on high-dose softening agents and improving the fabric's washability. At the same time, the microporous structure formed inside the fiber can improve air permeability, enhancing the fabric's lightness and breathability. Due to the stable and continuous internal microporous structure, even if a small amount of surface additives are lost, the fabric's fluffy characteristics are still retained, which can improve the fabric's washability and overcome the defects of traditional chemical fiber imitation cashmere fabrics, such as poor breathability and poor hand feel and washability, giving the fabric a fluffy and soft imitation cashmere feel.

[0026] 2. By limiting the spinning ratio and weaving process parameters in conjunction with the water-soluble defibering process, the water-soluble polyvinyl alcohol vinylon is fully dissolved, improving the defibering performance of the fabric and forming a fabric with a uniform microporous structure, thereby improving the fabric's lightness, breathability, and mass production consistency.

[0027] 3. The main body of the fabric is combed cotton fiber, and the water-soluble components are biodegradable. Compared with pure synthetic fiber imitation cashmere fabric, it is more green and environmentally friendly, and alleviates the environmental pollution caused by textile waste. Attached Figure Description

[0028] Figure 1 This is a microscopic schematic diagram of the fiber cross-section before the yarn water-soluble defibering treatment of the present invention.

[0029] Figure 2 This is a microscopic schematic diagram of the cross-section of the fiber after the yarn has undergone water-soluble defibering treatment according to the present invention.

[0030] Figure 3This is a schematic diagram of the loop stitching method for a double ribbed cotton wool structure in one embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the loop stitching method for a double rib cotton wool structure in another embodiment of the present invention.

[0032] Figure 5 This is an enlarged image of the finished fabric of this invention.

[0033] In the diagram: 1. Polyvinyl alcohol water-soluble vinylon; 2. Combed cotton; 3. Cotton yarn; 4. First needle; 5. Second needle; 6. Microporous structure. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] A method for preparing a lightweight, breathable, cashmere-like knitted fabric includes the following steps: S1. Raw material spinning: Combed cotton 2 and polyvinyl alcohol water-soluble vinylon 1 are blended as raw materials to prepare cotton yarn 3, which is then used as weaving raw material. S2. Fabric weaving: Using a double-sided weft knitting machine, the weaving raw material 3 obtained in step S1 is woven to produce a fabric with a double rib cotton wool structure. S3, Water-soluble defiber removal: The fabric obtained in step S2 is subjected to water bath heating treatment. By water bath heating, the polyvinyl alcohol water-soluble vinylon 1 contained in the fabric yarn is completely dissolved and removed, thereby forming a microporous void structure 6 inside the yarn fiber. S4. Dyeing, finishing and setting: The greige fabric after water-soluble defiber treatment in step S3 is sequentially cleaned, dyed, softened and set to obtain a finished knitted fabric with a continuous microporous structure 6.

[0036] The polyvinyl alcohol water-soluble vinylon 1 is prepared from raw materials that can be completely biodegraded naturally. The polyvinyl alcohol dissolved during the water-soluble defiberization process has good biodegradability. The fabric matrix is ​​mainly composed of combed cotton 2 fibers. After the product is discarded, it can be naturally degraded, thus alleviating the environmental pollution caused by textile solid waste.

[0037] In step S1, the blended raw material uses 40S / 1 to 50S / 1 combed cotton 2 combined with 30D to 75D polyvinyl alcohol water-soluble vinylon 1. By mass percentage, the combed cotton 2 fiber accounts for 75% to 85%, and the polyvinyl alcohol water-soluble vinylon 1 accounts for 15% to 25%. If the proportion of polyvinyl alcohol water-soluble vinylon 1 is too low, it will be difficult to generate a sufficient amount of microporous void structure 6 after defibering. If the proportion of polyvinyl alcohol water-soluble vinylon 1 is too high, it will reduce the overall strength of the blended yarn and make it easy for yarn breakage to occur during weaving. The above ratio can balance the relationship between the breaking stress of the blended yarn and the amount of microporous void structure 6 generated after defibering. In step S1, the weaving raw material 3 obtained is 30S / 1 to 40S / 1. Selecting blended yarns in this count range can take into account both the lightness and thinness of the greige fabric and the weaving stability. After water-soluble defibering treatment, a finished fabric with a suitable weight can be obtained.

[0038] In step S2, a 20-28G double-sided circular knitting machine is used to weave the greige fabric. The weaving process adopts a cotton-wool needle-knit structure, and the yarn length is controlled between 30-32cm / 100G to produce the greige fabric. The double rib cotton-wool structure, combined with the corresponding machine specifications and weaving yarn length parameters, results in a greige fabric with a uniform structure and a flat surface. This facilitates the uniform penetration of the water bath medium into the interior of the greige fabric, creating conditions for uniform fiber removal and the formation of a continuous microporous structure, thus ensuring the performance consistency of mass-produced products.

[0039] In the water-soluble defibering process of step S3, the water bath ratio is controlled at 1:(9-13), the treatment temperature is between 60-90℃, and the heat treatment time is 40-60min. This range of process parameters can ensure that the polyvinyl alcohol water-soluble vinylon 1 is fully dissolved, and avoid insufficient defibering leading to an insufficient number of microporous pore structures 6. Ultimately, after water bath defibering treatment, the yarn count of the finished yarn is increased to 40S / 1-50S / 1.

[0040] In the dyeing and finishing process of step S4, the bath ratio of the dyeing vat is controlled at 1:(22-26), the amount of sodium sulfate added is 6-10 g / L, and the amount of soda ash added is 2-4 g / L. The bath ratio is matched with the amount of dyeing accelerator and fixing agent added to promote the uniform dyeing of reactive dyes on combed cotton fibers 2, improve the uniformity of fabric dyeing, and enhance the color fastness. In the dyeing and finishing process of step S4, the addition of reactive dyes and softeners is controlled, and the amount of reactive dyes is controlled at 5%-8% of the fabric weight, and the amount of softener added is 1-3 g / L. This application relies on the microporous structure of the fiber 6 to form a basic fluffy touch, and only a low dose of softener is needed to reduce the amount of auxiliary agents adhering to the fabric surface. After washing, the hand feel is not prone to rapid decay, effectively improving the wash resistance stability of the fabric. The finished knitted fabric obtained by step S4 has a weight of 140-160 g / m². 2The fabric width is 145-165cm. Fabrics in this size range are moderately thin and lightweight, with excellent drape and wearing comfort, and are suitable for the processing and manufacturing of various clothing categories such as shirts, underwear, and knitted tops.

[0041] like Figure 1 The image shown is a microscopic schematic diagram of the fiber cross-section before the water-soluble defiber treatment of the yarn in this application. The cross-sections of the combed cotton 2 and the polyvinyl alcohol water-soluble vinylon 1 in an interlaced state can be clearly seen. Figure 2 This is a microscopic schematic diagram of the cross-section of the fiber after the yarn has undergone water-soluble defiber treatment. It can be seen that the polyvinyl alcohol water-soluble vinylon 1 in the figure has been completely dissolved, leaving only combed cotton 2, and a continuous and uniform microporous void structure 6 is left between adjacent combed cotton 2.

[0042] like Figure 3 and Figure 4 The diagrams shown illustrate two loop stitch techniques for double rib knitting in a cotton wool structure, with the first needle 4 and the second needle 5 respectively. These two loop stitch techniques are commonly used on double rib knitting machines and will not be elaborated further here. Figure 5 As shown, the lightweight knitted fabric is prepared by the method of this application. Because the interior of the knitted fabric is filled with a continuous microporous structure 6 formed by the dissolution of polyvinyl alcohol water-soluble vinylon 1, the fabric has a fluffy and soft cashmere-like feel and high breathability and moisture permeability.

[0043] Example 1

[0044] S1. Raw material spinning: 40S / 1 combed cotton 2 is selected and 50D polyvinyl alcohol water-soluble vinylon 1 is selected. The mass ratio between combed cotton 2 and polyvinyl alcohol water-soluble vinylon 1 is 80:20. The blended yarn is made into 40S / 1 melt-spun yarn as weaving raw material. S2. Fabric weaving: 28G double-sided circular knitting machine is used to weave the grease using a cotton and wool double rib structure with a yarn length of 30cm / 100G. S3, Water-soluble defibering: The water bath ratio is controlled at 1:13, and the temperature is maintained at 75℃ for 50 minutes. The polyvinyl alcohol water-soluble vinylon 1 is completely dissolved. Rinse with clean water twice to make the yarn count after defibering 46S / 1. S4. Dyeing, Finishing and Setting: Control the liquor ratio at 1:24, add 6g / L sodium sulfate, 2g / L soda ash, 5% reactive dye, and 1g / L softener, then dye, dry, and set. The finished product weight after setting is 142g / m². 2 The finished product width is 150cm, and the thickness of the finished product is measured to be 0.0119mm less than before fiber removal. The air permeability is 151mm / s. Tests show that the fabric does not feel noticeably stiff after 10 washes.

[0045] Example 2

[0046] S1. Raw material spinning: 40S / 1 combed cotton 2 is selected and 50D polyvinyl alcohol water-soluble vinylon 1 is selected. The mass ratio between combed cotton 2 and polyvinyl alcohol water-soluble vinylon 1 is 80:20. The blended yarn is made into 40S / 1 melt-spun yarn as weaving raw material. S2. Fabric weaving: The greige fabric is woven using a 28G double-sided circular knitting machine with a yarn length of 31cm / 100G. S3, Water-soluble defiber removal: Control the water bath ratio at 1:11, maintain a high temperature of 90℃ for 60 minutes, quickly and completely remove fibers, and rinse twice with clean water. S4. Dyeing, Finishing and Setting: Control the liquor ratio at 1:24, add 6g / L sodium sulfate, 2g / L soda ash, 5% reactive dye, and 1g / L softener, then dye, dry, stretch and set. The finished product weight after setting is 148g / m². 2 The width is 155cm; the thickness of the finished product was measured to be 0.0122mm less, and the air permeability was 148mm / s.

[0047] The high-temperature defibering process in this embodiment is adapted to continuous high-speed production lines, and calculations show that production efficiency is increased by 20%.

[0048] Example 3

[0049] S1. Raw material spinning: 40S / 1 combed cotton 2 is selected and 50D polyvinyl alcohol water-soluble vinylon 1 is selected. The mass ratio between combed cotton 2 and polyvinyl alcohol water-soluble vinylon 1 is 80:20. The blended yarn is made into 40S / 1 melt-spun yarn as weaving raw material. S2. Fabric weaving: A 28G double-sided circular knitting machine is used to weave a loosely woven fabric with a yarn length of 32cm / 100G. S3, Water-soluble defiber removal: The water bath ratio is controlled at 1:9, and the polyvinyl alcohol water-soluble vinylon 1 is slowly dissolved at 60℃ for 40 minutes. The fiber micropore structure 6 is detected to be more uniformly distributed. S4. Dyeing, Finishing and Setting: Control the liquor ratio at 1:24, add 6g / L sodium sulfate, 2g / L soda ash, 5% reactive dye, and 1g / L softener, then dye, dry, stretch and set. The finished product weight after setting is 148g / m². 2 Width 155cm; finished product weight measured 156g / m² 2 The width is 162cm; the thickness decreased by 0.0104mm, and the air permeability was 153mm / s.

[0050] This embodiment uses a 60℃ low-temperature process, which consumes less energy and is suitable for the production of light-colored and sensitive-colored fabrics.

[0051] The basic working principle of this invention is as follows: combed cotton 2 is blended with polyvinyl alcohol water-soluble vinylon 1, and a continuous microporous structure 6 is formed inside the fiber through water-soluble defiberization. The fluffy feel is achieved by relying on the physical structure of the fiber itself, reducing the dependence on high-dose softening agents and improving the fabric's washability. At the same time, the microporous structure 6 formed inside the fiber can improve air permeability, enhance the fabric's lightness and breathability. Relying on the stable and continuous internal microporous structure 6, even if a small amount of surface additives are lost, the fabric's fluffy characteristics are still retained, which can improve the fabric's washability and overcome the defects of traditional chemical fiber imitation cashmere fabrics, such as poor breathability and poor hand feel and washability, so that the fabric has a fluffy and soft imitation cashmere feel.

[0052] This application provides a knitted fabric with a lightweight, breathable, cashmere-like feel, which is made using the above-mentioned preparation method. This results in a continuous microporous structure 6 inside the fabric, which helps to improve the fabric's breathability and the durability of its fluffy feel. The fabric material is environmentally friendly and easily degradable, and has a wide range of applications.

[0053] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A method for preparing a lightweight, breathable, cashmere-like knitted fabric, characterized in that, Includes the following steps: S1. Raw material spinning: Combed cotton and polyvinyl alcohol water-soluble vinylon are blended as raw materials to prepare cotton yarn, which is then used as a weaving raw material. S2. Fabric weaving: Using a double-sided weft knitting machine, the weaving raw material obtained in step S1 is woven to produce a fabric with a double rib cotton wool structure. S3, Water-soluble defiber removal: The fabric obtained in step S2 is subjected to water bath heating treatment. By heating in a water bath, the polyvinyl alcohol water-soluble vinylon contained in the fabric yarn is completely dissolved and removed, thereby forming a microporous structure inside the yarn fiber. S4. Dyeing, finishing and setting: The greige fabric after water-soluble defiber treatment in step S3 is sequentially cleaned, dyed, softened and set to obtain a finished knitted fabric with a continuous microporous structure.

2. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In step S1, the blended raw material is 40S / 1 to 50S / 1 combed cotton combined with 30D to 75D polyvinyl alcohol water-soluble vinylon; By weight percentage, combed cotton fiber accounts for 75% to 85%, and polyvinyl alcohol water-soluble vinylon accounts for 15% to 25%.

3. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In step S1, the specifications of the fabric raw material obtained are 30S / 1 to 40S / 1.

4. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: The polyvinyl alcohol water-soluble vinylon is prepared from raw materials that are completely biodegradable.

5. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In step S2, a 20-28G double-sided circular knitting machine is used to weave the greige fabric, and the weaving process adopts a cotton-wool needle-on-needle structure. The yarn length is controlled between 30-32cm / 100G to obtain the greige fabric.

6. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In the water-soluble defiber removal process of step S3, the water bath ratio is controlled at 1:(9~13), the treatment temperature is between 60~90℃, and the heat treatment time is 40~60min.

7. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In the dyeing and finishing process of step S4, the dye bath ratio is controlled at 1:(22~26), the amount of sodium sulfate added is 6~10g / L, and the amount of soda ash added is 2~4g / L.

8. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: In the dyeing and finishing process of step S4, reactive dyes and softeners are added, and the amount of reactive dyes is controlled to be 5% to 8% of the fabric weight, and the amount of softener added is 1 to 3 g / L.

9. The method for preparing a lightweight, breathable, cashmere-like knitted fabric according to claim 1, characterized in that: The finished knitted fabric obtained in step S4 has a weight controlled at 140–160 g / m². 2 The width is 145-165cm.

10. A lightweight, breathable, cashmere-like knitted fabric, characterized in that: It is prepared by any one of the preparation methods described in claims 1 to 9.

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