A knitted, one-piece, four-layer stab-resistant fabric and its knitting method

Abstract

This invention relates to a knitted, one-piece, four-layer stab-resistant fabric and its weaving method, belonging to the field of protective textile materials. The stab-resistant fabric includes a first stab-resistant layer, a second stab-resistant layer, a connecting yarn, a cushioning layer, and a skin-friendly layer; the stab-resistant fabric is formed by a fully knitted construction. The first stab-resistant layer is woven from a first yarn; the second stab-resistant layer is woven from a second yarn, the second yarn having a higher elastic modulus than the first yarn; the connecting yarn is made of polyethylene fiber treated with a shear-thickening liquid, which connects the first and second stab-resistant layers through a loop; the cushioning layer connects the second stab-resistant layer and the skin-friendly layer, and is woven from high-elastic filaments; the skin-friendly layer is woven from fine denier fibers. The knitted, one-piece, four-layer stab-resistant fabric provided by this invention has excellent stab protection performance, meets the safety protection requirements of stab-resistant clothing, and has good softness, comfort, breathability, and elasticity.

Description

Technical Field

[0001] This invention relates to the field of protective textile materials, specifically to a knitted, one-piece, four-layer puncture-resistant fabric and its weaving method. Background Technology

[0002] The market demand for protective clothing such as stab-proof vests and stab-proof suits that can ensure life safety is constantly increasing. Therefore, the research on developing a high-performance stab-proof fabric has important research significance and application value.

[0003] Currently, research and development of stab-resistant clothing mainly focuses on soft stab-resistant clothing, while innovation in hard and semi-hard stab-resistant clothing is difficult, primarily relying on novel metal materials. Existing design and research on soft stab-resistant clothing mainly concentrates on weaving through multi-layer material composite stacking, lamination, and resin bonding. For example, CN202210202715.X provides a fabric with an abrasion-resistant and stab-resistant structure, which uses a three-layer concave-convex stab-resistant layer, a base fabric layer, an abrasion-resistant layer, and a fine-grid elastic fabric layer for sealing and binding, giving the fabric excellent elasticity, abrasion resistance, and stab resistance. However, this stab-resistant fabric is too thick, requiring edge binding and lamination processes, and even multiple machines to produce each layer, making weaving and production difficult. CN202210486614.X discloses a stab-resistant fabric with a porous cushioning structure and its preparation method. The porous cushioning structure and the main stab-resistant structure are obtained through 3D printing technology, and then coated with epoxy resin and cured under pressure to obtain a lightweight and highly protective stab-resistant fabric. This material is made by laminating resin materials, but it softens after prolonged exposure to high temperatures, resulting in a significant decrease in stab resistance. Furthermore, stab-resistant fabrics prepared through multi-layer composite structures suffer from issues such as instability between layers, high material thickness, compromised breathability, moisture permeability, and softness, and complex weaving processes. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a knitted, one-piece, four-layer stab-resistant fabric and its weaving method.

[0005] On one hand, this invention provides a knitted, one-piece, four-layer stab-resistant fabric, characterized in that the four-layer stab-resistant fabric includes a first stab-resistant layer, a second stab-resistant layer, a cushioning layer, and a skin-friendly layer; the first stab-resistant layer is woven from a first yarn; the second stab-resistant layer is woven from a second yarn; the elastic modulus of the second yarn is greater than that of the first yarn; the connecting yarn is polyethylene fiber treated with a shear-thickening liquid, which connects the first and second stab-resistant layers through a loop; the cushioning layer connects the second stab-resistant layer and the skin-friendly layer, and is woven from high-elasticity filaments; the skin-friendly layer is woven from fine denier fibers. The second stab-resistant layer has a higher elastic modulus than the first stab-resistant layer, and the low-elasticity first stab-resistant layer and the high-elasticity second stab-resistant layer are located on the front and back sides of the stab-resistant fabric, allowing the fabric to bend and deform to achieve higher energy absorption.

[0006] Furthermore, the first yarn has a breaking strength greater than 32 cN / dtex, a breaking elongation of less than 4%, and a modulus greater than 1200 cN / dtex. The high-strength, high-modulus yarn can provide good protection for the first puncture-resistant layer.

[0007] Furthermore, the first yarn comprises one or more of ultra-high molecular weight polyethylene fiber, glass fiber, and aramid fiber.

[0008] Furthermore, the second yarn is a covered yarn.

[0009] Furthermore, the covered yarn includes a core filament and at least one covering layer, the core filament being a spandex filament, and the covering layer being one or more of polyethylene, aramid, and glass fiber.

[0010] Furthermore, the high-elastic filament includes one or more of high-elastic polyester, nylon, and polypropylene filaments.

[0011] Furthermore, the denier of the fine denier fiber is 0.3-2.4D.

[0012] Furthermore, the fine denier fiber includes one or more of polyester fiber, regenerated cellulose fiber, and polyacrylonitrile fiber.

[0013] On the other hand, a method for weaving a four-layer knitted stab-resistant fabric is provided, wherein the fabric is formed by connecting layers through a fully knitted process, as detailed below:

[0014] In rows 1, 2, and 3, the first yarn is introduced and the first puncture-resistant layer is knitted on the front needle bed with an alternating stitch interval of 3 stitches. In rows 4, 5, and 6, the second yarn is introduced and the second puncture-resistant layer is knitted on the back needle bed with an alternating stitch interval of 3 stitches. In rows 8, 9, 10, 11, 12, and 13, the above knitting process is repeated on both the front and back needle beds. In rows 7 and 14, a connecting yarn is introduced and the first and second puncture-resistant layers are connected by an alternating stitch weave structure on both the front and back needle beds. Fine denier fibers are introduced to knit a skin-friendly layer using a plain weave structure. Finally, high-elastic filaments are used to knit an intermittent buffer layer on both the front and back needle beds, connecting the second puncture-resistant layer and the skin-friendly layer.

[0015] Furthermore, the thickness of the buffer layer is adjusted by changing the spacing of the high-elasticity filament loops.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] (1) The knitted four-layer structure anti-stab fabric of the present invention does not require the superposition of composite processes such as sewing, pressing and resin bonding in the later stage. Each layer is connected by coils, which makes it difficult to separate or slip, and has very good integrity.

[0018] (2) The first stab-resistant layer, connecting layer, and second stab-resistant layer of the knitted integrated four-layer stab-resistant fabric of the present invention can cooperate and act together to form the fabric's locking and tightening effects, enhancing the fabric's puncture resistance and impact resistance mechanism, and better realizing the fabric's stab-resistant protection function. Furthermore, the stab-resistant fabric has a buffer layer structure, good impact resistance, compression resistance, shock absorption, and cushioning effect, which can dissipate the impact force during puncture and prevent the sharp part of the knife from piercing the fabric and causing injury to the human body.

[0019] (3) The knitted four-layer structure stab-proof fabric of the present invention can adjust the thickness of the buffer layer according to the actual stab-proof requirements, so it is suitable for protective clothing applications of various stab-proof standards.

[0020] (4) The four-layer knitted anti-stab fabric of the present invention is all coil structure. With the presence of the buffer layer gap, the fabric is soft and can store more air, so as to realize the regulation of the "microclimate" between the clothing and the human body and meet the needs of breathability, stretchability, comfort and other aspects. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art are briefly introduced below. The accompanying drawings are only a part of the examples of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0022] Figure 1This is a schematic diagram of the structure of the four-layer knitted anti-stab fabric of the present invention; a is the overall effect of the fabric, b is the partial connection effect of the fabric, 11 is the first anti-stab layer, 12 is the second anti-stab layer, 13 is the buffer layer, 14 is the skin-friendly layer, 15 is the connecting yarn, and 16 is the high-elastic filament.

[0023] Figure 2 This is a schematic diagram of the second yarn structure provided in Embodiment 1 of the present invention. 21 is spandex, 22 is aramid, and 23 is polyethylene.

[0024] Figure 3 This is a diagram of the knitted, one-piece molded four-layer stab-resistant fabric provided in Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram illustrating the stab-resistant principle of the knitted, one-piece, four-layer structure stab-resistant fabric provided in Embodiment 1 of the present invention. Detailed Implementation

[0026] This invention provides a four-layer knitted stab-resistant fabric and its knitting method. The stab-resistant fabric is a four-layer knitted structure, integrally formed by a MACH2XSI53-12G Shima Seiki four-needle bed computerized flat knitting machine. It eliminates the need for subsequent stitching, pressing, resin bonding, and other composite processes, relying on loop connections to prevent delamination and slippage, resulting in good overall integrity.

[0027] The ultra-high molecular weight polyethylene involved in this invention refers to unbranched linear polyethylene with a molecular weight of 1.5 million or more.

[0028] The experimental and testing methods involved in the following embodiments and comparative examples are as follows:

[0029] Shear thickening liquid impregnation treatment: Commercially available shear thickening liquid (STF) is diluted with ethanol at a volume ratio of 1:3. The yarn or fabric is immersed in the diluted mixture of shear thickening liquid and ethanol for 20 minutes. The impregnated yarn or fabric is then placed in an oven and dried at 80°C for 1 hour to remove the ethanol, thus producing yarn or fabric treated with STF.

[0030] The puncture strength of fabrics is determined according to the standard GB / T 23318-2009 "Determination of puncture strength of textiles". The greater the strength, the better the puncture resistance.

[0031] The stab-resistant performance of the fabric is referenced to standard GA 68-2019 "Police Stab-Resistant Vests". The test blade is the standard blade (D1) for Class A stab-resistant vests in this standard. The test subject punctures the stab-resistant vest with an impact energy of 24J±0.5J. Under effective puncture conditions, the stab-resistant vest should not show penetration.

[0032] Drape coefficient test: The drape of the fabric is evaluated in accordance with GB / T23329-2009 "Textiles - Determination of drape of fabrics". The higher the drape coefficient of the fabric, the softer the fabric.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly defined in terms of the central direction.

[0034] The present invention will be further described below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the present invention.

[0035] Example 1

[0036] This embodiment provides a knitted, one-piece, four-layer puncture-resistant fabric and its knitting method.

[0037] (1) Raw material selection:

[0038] The first stab-resistant layer is woven using 400D ultra-high molecular weight polyethylene fiber as the first yarn. The 400D / 240F ultra-high molecular weight polyethylene has a tensile strength of 34 cN / dtex, an elongation at break of 3.5%, and a modulus of 1250 cN / dtex. The second stab-resistant layer is woven using a covering yarn composed of 150D polyethylene, 100D aramid, and 70D spandex as the second yarn. The elastic modulus of the second yarn is greater than that of the first yarn. The structure of the second yarn is as follows: Figure 2 As shown; the connecting yarn is made of 400D ultra-high molecular weight polyethylene fiber impregnated with shear-thickening liquid, which is woven in a staggered loop on the front and back needle beds to connect the first and second anti-stab layers. The shear-thickening liquid impregnation process is as follows: the shear-thickening liquid and ethanol are mixed and diluted at a volume ratio of 1:3, the 400D ultra-high molecular weight polyethylene fiber is immersed in the diluted shear-thickening liquid and ethanol mixture for 20 minutes, and the impregnated fiber is placed in an oven and dried at 80°C for 1 hour to remove the ethanol, thus producing fiber impregnated with STF; the buffer layer uses 50D high-elastic polyester monofilament as a high-elastic filament to connect the second anti-stab layer and the skin-friendly layer; the skin-friendly layer is woven using 1D fine denier polyester yarn as raw material.

[0039] (2) Weaving method:

[0040] Figure 1a is a structural diagram of a four-layer knitted anti-stab fabric, which includes a first anti-stab layer 11, a second anti-stab layer 12, a connecting yarn 15, a buffer layer 13, and a skin-friendly layer 14. Figure 3 This is the weave diagram for a four-layer stab-resistant fabric. In rows 1, 2, and 3 of the weave diagram, the machine feeds in the first yarn, and the first stab-resistant layer 11 is woven on the front needle bed with an alternating pattern of 3 stitches, resulting in a smooth fabric appearance and a tight fabric structure. In rows 4, 5, and 6 of the weave diagram, the machine feeds in the second yarn, and the second stab-resistant layer 12 is woven on the back needle bed with an alternating pattern of 3 stitches. In rows 8, 9, 10, 11, 12, and 13, the above weaving process is repeated on both the front and back needle beds. In rows 7 and 14 of the weave diagram, 400D ultra-high molecular weight polyethylene fibers, treated with a shear-thickening liquid, are fed into the yarn feeder as connecting yarn 15, connecting the first puncture-resistant layer 11 and the second puncture-resistant layer 12. The connecting yarn is woven in a 1-interval, 1-tuck weave structure on the front and back needle beds. The first puncture-resistant layer 11 and the second puncture-resistant layer 12 are tightly connected, making them less prone to delamination and slippage. The tuck loops connect the puncture-resistant layers, with the loops nested inside the two puncture-resistant layers, increasing the fabric's thickness. The loop relationship of the connecting yarn 15 connecting the first puncture-resistant layer 11 and the second puncture-resistant layer 12 is as follows: Figure 1 As shown in b, the thickness of the first and second stab-resistant layers is 3.4 mm. Based on the above weaving technology, the fabric woven with front and rear needle beds forms a relatively thick and dense two-layer stab-resistant structure, and the elastic modulus of the second stab-resistant layer 12 is greater than that of the first stab-resistant layer 11. The low elastic modulus stab-resistant layer 11 and the high elastic modulus stab-resistant layer 12 are located on the front and rear sides of the stab-resistant fabric, allowing the fabric to bend and deform to obtain higher energy absorption. The buffer layer 13 uses 50D high-elastic polyester monofilament as the high-elastic filament 16, which is woven with the front and rear needle beds every 3 stitches on the machine, connecting the second stab-resistant layer 12 and the skin-friendly layer 14, forming a buffer layer with a thickness of 2.6 mm. The skin-friendly layer 14 is fed with 1D fine denier polyester yarn and woven with a weft plain knit structure, with a skin-friendly layer thickness of 0.5 mm.

[0041] (3) Performance testing:

[0042] The puncture strength of the four-layer puncture-resistant fabric obtained in Example 1 is 6456.348N; the fabric can withstand 24J of impact energy without penetration; the fabric drape coefficient is 47.44%.

[0043] The stab-resistant principle of the knitted, one-piece, four-layer stab-resistant fabric in this embodiment is as follows: Figure 4 As shown. Figure 4The fabric and yarn structure shown in this embodiment is for puncture resistance principle analysis only and differs slightly from the actual fabric. When the blade begins to puncture the four-layer puncture-resistant fabric, the coil structure in the first puncture-resistant layer 11 begins to expand, compress, and cut, providing the first wave of resistance and energy absorption against the blade impact. The connecting yarn 15 in the first puncture-resistant layer 11, due to treatment with a shear-thickening liquid, has nanoparticles attached to its fiber surface that increase the friction between fibers, thereby restricting yarn movement. The connecting yarn is arranged with three rows of coils, allowing the shear-thickening liquid sufficient response time, resulting in better shear and puncture resistance. Furthermore, when the blade impacts the connecting yarn 15, the high fiber friction makes slippage less likely, preventing fabric deformation and hindering blade penetration. Simultaneously, the strong shear resistance of the fibers and the friction between the blade and the nanoparticles also dissipate impact energy, making it difficult for the blade to cut the connecting yarn 15. In the stab-resistant fabric, the length of the connecting yarn 15 remains constant. When the arc of the connecting fiber 15 in the first stab-resistant layer 11 expands, it also pulls the coil structure in the second stab-resistant layer 12, making the structure of the second stab-resistant layer 12 more compact, thus better resisting the impact of the blade. When the blade pierces the first stab-resistant layer 11 and reaches the second stab-resistant layer 12, due to the good elasticity and softness of the fabric, the second stab-resistant layer 12 will be pushed into a depression by the blade. This local depression will pull the connecting yarn 15, causing the first stab-resistant layer 11, which has been squeezed and expanded by the blade, to contract and tighten, locking the blade and achieving a locking effect, thereby further preventing the blade from penetrating. The second stab-resistant layer 12 also contains connecting yarns treated with shear thickening liquid to prevent blade penetration. When the yarn in the second stab-resistant layer 12 breaks and the stab-resistant layer is punctured, the buffer layer can provide a certain cushioning effect, dissipating some of the impact force generated on the fabric when the blade pierces, preventing the sharp part of the blade from piercing the fabric.

[0044] Comparative Example 1

[0045] This comparative example provides a knitted, one-piece, four-layer stab-resistant fabric and its knitting method.

[0046] (1) Raw material selection:

[0047] The first stab-resistant layer is woven using 400D ultra-high molecular weight polyethylene fiber as the first yarn. The 400D / 240F ultra-high molecular weight polyethylene has a tensile strength of 34cN / dtex, an elongation at break of 3.5%, and a modulus of 1250cN / dtex. The second stab-resistant layer is woven using 400D ultra-high molecular weight polyethylene fiber of the same specification as the second yarn. The elastic modulus of the second yarn is equal to that of the first yarn. The connecting yarn is made of 400D ultra-high molecular weight polyethylene fiber impregnated with shear-thickening liquid and woven in a staggered loop on the front and back needle beds to connect the first and second stab-resistant layers. The shear-thickening liquid impregnation process is the same as in Example 1. The buffer layer uses 50D high-elastic polyester monofilament as the high-elastic filament to connect the second stab-resistant layer and the skin-friendly layer. The skin-friendly layer is woven using 1D fine denier polyester yarn as the raw material.

[0048] (2) Weaving method:

[0049] In rows 1, 2, and 3 of the weave diagram, the machine feeds in the first yarn, and the first puncture-resistant layer 11 is knitted on the front needle bed with an alternating pattern of 3 stitches, resulting in a smooth fabric appearance and a tight fabric structure. In rows 4, 5, and 6 of the weave diagram, the machine feeds in the second yarn, and the second puncture-resistant layer 12 is knitted on the back needle bed with an alternating pattern of 3 stitches. The above knitting process is repeated on the front and back needle beds in rows 8, 9, 10, 11, 12, and 13. In rows 7 and 14 of the weave diagram, 400D ultra-high molecular weight polyethylene fibers, treated with a shear-thickening liquid and fed into the yarn feeder, serve as the connecting yarn 15 between the first puncture-resistant layer 11 and the second puncture-resistant layer 12 on the front and back needle beds. The connecting yarn is woven in a 1-interval, 1-tuck weave structure on the front and back needle beds, ensuring a tight connection between the first puncture-resistant layer 11 and the second puncture-resistant layer 12, preventing delamination and slippage. The tuck loops connect the puncture-resistant layers, with the loops nested inside the two puncture-resistant layers, increasing the fabric's thickness. The loop relationship of the connecting yarn 15 connecting the first puncture-resistant layer 11 and the second puncture-resistant layer 12 is as follows: Figure 1 As shown in b, the thickness of the first and second puncture-resistant layers is 3.4 mm. Based on the above knitting technique, the fabric knitted on the front and back needle beds forms a relatively thick and dense two-layer puncture-resistant structure. The buffer layer 13 uses 50D high-elastic polyester monofilament as the high-elastic filament 16, and is knitted on the front and back needle beds at 3-needle intervals to connect the second puncture-resistant layer 12 and the skin-friendly layer 14, forming a buffer layer with a thickness of 2.6 mm. The skin-friendly layer 14 is fed with 1D fine denier polyester yarn and knitted in a plain weft knit structure, with a skin-friendly layer thickness of 0.5 mm.

[0050] (3) Performance testing:

[0051] The puncture strength of the four-layer puncture-resistant fabric obtained in Comparative Example 1 was 5489.156 N; the fabric could not withstand 24 J of impact energy and showed a 1.3 mm penetration; the fabric drape coefficient was 51.8%.

[0052] A comparison of Example 1 and Comparative Example 1 reveals that when the elastic modulus of the second stab-resistant layer is greater than that of the first stab-resistant layer—that is, when the low-elasticity modulus stab-resistant layer and the high-elasticity modulus stab-resistant layer are located on the front and back sides of the stab-resistant fabric—the fabric can bend and deform to achieve higher energy absorption. When the first and second stab-resistant layers are woven from fibers of the same specification, their elastic modulus is the same, resulting in a reduced stab-resistant effect.

[0053] Comparative Example 2

[0054] A knitted one-piece molded double-sided stab-proof fabric with the same thickness as the four-layer knitted one-piece structure stab-proof fabric described in Example 1 is provided. The double-sided stab-proof fabric is woven using a double rib weave process, and 400D ultra-high molecular weight polyethylene fiber is used to be woven alternately on the front and back needle beds. The fabric presents a double-sided effect, and the overall thickness of the fabric is 6.5mm.

[0055] Performance testing: The puncture strength of the four-layer puncture-resistant fabric obtained in Comparative Example 2 was 3624.519 N; the fabric could not withstand 24 J of impact energy and showed a 4.7 mm penetration; the fabric drape coefficient was 39.82%.

[0056] A comparison of Example 1 and Comparative Example 2 revealed that, despite having the same thickness, the stab protection effect differed significantly. The simple double-sided stab protection fabric did not meet the GA 68-2019 "Police Stab Protection Clothing" standard in the stab protection test.

[0057] Comparative Example 3

[0058] A knitted one-piece molded double-sided stab-resistant fabric with the same thickness as the four-layer knitted one-piece structure stab-resistant fabric described in Example 1 is described. The difference between the double-sided stab-resistant fabric and Comparative Example 2 is that the fabric is subjected to shear thickening liquid impregnation treatment after knitting. The shear thickening liquid impregnation treatment process is the same as in Example 1, except that the impregnation object is the fabric.

[0059] Performance testing: The puncture strength of the four-layer puncture-resistant fabric obtained in Comparative Example 3 is 6682.942 N; the fabric can withstand 24 J of impact energy without penetration; the fabric drape coefficient is 66.42%.

[0060] A comparison of Example 1 and Comparative Example 3 revealed that both exhibited excellent stab-proof performance, meeting the police stab-proof standards for clothing. In the drape performance test, Example 1 had a drape coefficient of 47.44%, which was greater than that of Comparative Example 3, indicating better softness and comfort.

[0061] The above description only illustrates the technical solution of the present invention with reference to preferred embodiments. However, those skilled in the art should be able to make changes in specific implementation methods and application scope based on the ideas of the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A knitted, one-piece, four-layer stab-resistant fabric, characterized in that, The fabric is formed by full-form knitting; the four-layer stab-resistant fabric includes a first stab-resistant layer, a second stab-resistant layer, a cushioning layer, and a skin-friendly layer; the first stab-resistant layer is woven from a first yarn, the first yarn having a breaking strength greater than 32 cN / dtex, a breaking elongation of less than 4%, and a modulus greater than 1200 cN / dtex; the second stab-resistant layer is woven from a second yarn, the second yarn being a covered yarn; the elastic modulus of the second yarn is greater than that of the first yarn; the connecting yarn is polyethylene fiber treated with shear-thickening liquid, which connects the first stab-resistant layer and the second stab-resistant layer through an interlaced needle-knitted weave structure; the cushioning layer connects the second stab-resistant layer and the skin-friendly layer, and is woven from high-elastic filaments; the skin-friendly layer is woven from fine denier fibers; The fabric is formed by full-body knitting, and the fabric knitting process includes: In rows 1, 2, and 3, the first yarn is introduced and the first puncture-resistant layer is knitted on the front needle bed with an alternating stitch interval of 3 stitches. In rows 4, 5, and 6, the second yarn is introduced and the second puncture-resistant layer is knitted on the back needle bed with an alternating stitch interval of 3 stitches. In rows 8, 9, 10, 11, 12, and 13, the above knitting process is repeated on both the front and back needle beds. In rows 7 and 14, a connecting yarn is introduced and the first and second puncture-resistant layers are connected by an alternating stitch weave structure on both the front and back needle beds. Fine denier fibers are introduced to knit a skin-friendly layer using a plain weave structure. Finally, high-elastic filaments are used to knit an intermittent buffer layer on both the front and back needle beds, connecting the second puncture-resistant layer and the skin-friendly layer.

2. The knitted, one-piece, four-layer stab-resistant fabric according to claim 1, characterized in that, The first yarn includes one or more of ultra-high molecular weight polyethylene, glass fiber, and aramid fiber.

3. The knitted, one-piece, four-layer stab-resistant fabric according to claim 1, characterized in that, The covered yarn includes a core filament and at least one covering layer, wherein the core filament includes spandex filament and the covering layer includes one or more of polyethylene, aramid, and glass fiber.

4. The knitted, one-piece, four-layer stab-resistant fabric according to claim 1, characterized in that, The high-elastic filament includes one or more of high-elastic polyester, nylon, and polypropylene filaments.

5. The knitted, one-piece, four-layer stab-resistant fabric according to claim 1, characterized in that, The denier of the fine denier fiber is 0.3-2.4D.

6. The knitted, one-piece, four-layer stab-resistant fabric according to claim 1 or 5, characterized in that, The fine denier fibers include one or more of polyester fibers, regenerated cellulose fibers, and polyacrylonitrile fibers.

7. The knitting method of the one-piece knitted four-layer stab-resistant fabric according to any one of claims 1 to 6, characterized in that, The fabric is formed by connecting all parts through a fully knitted process, specifically including: In rows 1, 2, and 3, the first yarn is introduced and the first puncture-resistant layer is knitted on the front needle bed with an alternating stitch interval of 3 stitches. In rows 4, 5, and 6, the second yarn is introduced and the second puncture-resistant layer is knitted on the back needle bed with an alternating stitch interval of 3 stitches. In rows 8, 9, 10, 11, 12, and 13, the above knitting process is repeated on both the front and back needle beds. In rows 7 and 14, a connecting yarn is introduced and the first and second puncture-resistant layers are connected by an alternating stitch weave structure on both the front and back needle beds. Fine denier fibers are introduced to knit a skin-friendly layer using a plain weave structure. Finally, high-elastic filaments are used to knit an intermittent buffer layer on both the front and back needle beds, connecting the second puncture-resistant layer and the skin-friendly layer.

8. The knitting method for the one-piece knitted four-layer stab-resistant fabric according to claim 7, characterized in that, The thickness of the buffer layer is adjusted by changing the spacing of the high-elastic filament loops.

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